*
* Connection Manager
*
- * Copyright (C) 2007-2010 Intel Corporation. All rights reserved.
+ * Copyright (C) 2007-2014 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
#endif
#include <errno.h>
+#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdint.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
+#include <fcntl.h>
#include <netdb.h>
+#include <resolv.h>
+#include <gweb/gresolv.h>
#include <glib.h>
#include "connman.h"
+#if defined TIZEN_EXT
+#include <sys/smack.h>
+#include <systemd/sd-daemon.h>
+#endif
+
+#define debug(fmt...) do { } while (0)
+
#if __BYTE_ORDER == __LITTLE_ENDIAN
struct domain_hdr {
uint16_t id;
#error "Unknown byte order"
#endif
+struct qtype_qclass {
+ uint16_t qtype;
+ uint16_t qclass;
+} __attribute__ ((packed));
+
struct partial_reply {
uint16_t len;
uint16_t received;
};
struct server_data {
- char *interface;
+ int index;
GList *domains;
char *server;
+ struct sockaddr *server_addr;
+ socklen_t server_addr_len;
int protocol;
GIOChannel *channel;
guint watch;
guint timeout;
- gboolean enabled;
- gboolean connected;
+ bool enabled;
+ bool connected;
struct partial_reply *incoming_reply;
};
socklen_t sa_len;
int client_sk;
int protocol;
+ int family;
guint16 srcid;
guint16 dstid;
guint16 altid;
gpointer resp;
gsize resplen;
struct listener_data *ifdata;
- gboolean append_domain;
+ bool append_domain;
};
struct listener_data {
- char *ifname;
- GIOChannel *udp_listener_channel;
- guint udp_listener_watch;
- GIOChannel *tcp_listener_channel;
- guint tcp_listener_watch;
+ int index;
+
+ GIOChannel *udp4_listener_channel;
+ GIOChannel *tcp4_listener_channel;
+ guint udp4_listener_watch;
+ guint tcp4_listener_watch;
+
+ GIOChannel *udp6_listener_channel;
+ GIOChannel *tcp6_listener_channel;
+ guint udp6_listener_watch;
+ guint tcp6_listener_watch;
+};
+
+/*
+ * The TCP client requires some extra handling as we need to
+ * be prepared to receive also partial DNS requests.
+ */
+struct tcp_partial_client_data {
+ int family;
+ struct listener_data *ifdata;
+ GIOChannel *channel;
+ guint watch;
+ unsigned char *buf;
+ unsigned int buf_end;
+ guint timeout;
};
+struct cache_data {
+ time_t inserted;
+ time_t valid_until;
+ time_t cache_until;
+ int timeout;
+ uint16_t type;
+ uint16_t answers;
+ unsigned int data_len;
+ unsigned char *data; /* contains DNS header + body */
+};
+
+struct cache_entry {
+ char *key;
+ bool want_refresh;
+ int hits;
+ struct cache_data *ipv4;
+ struct cache_data *ipv6;
+};
+
+struct domain_question {
+ uint16_t type;
+ uint16_t class;
+} __attribute__ ((packed));
+
+struct domain_rr {
+ uint16_t type;
+ uint16_t class;
+ uint32_t ttl;
+ uint16_t rdlen;
+} __attribute__ ((packed));
+
+/*
+ * Max length of the DNS TCP packet.
+ */
+#define TCP_MAX_BUF_LEN 4096
+
+/*
+ * We limit how long the cached DNS entry stays in the cache.
+ * By default the TTL (time-to-live) of the DNS response is used
+ * when setting the cache entry life time. The value is in seconds.
+ */
+#if defined TIZEN_EXT
+#define MAX_CACHE_TTL (60 * 60)
+#else
+#define MAX_CACHE_TTL (60 * 30)
+#endif
+/*
+ * Also limit the other end, cache at least for 30 seconds.
+ */
+#define MIN_CACHE_TTL (30)
+
+/*
+ * We limit the cache size to some sane value so that cached data does
+ * not occupy too much memory. Each cached entry occupies on average
+ * about 100 bytes memory (depending on DNS name length).
+ * Example: caching www.connman.net uses 97 bytes memory.
+ * The value is the max amount of cached DNS responses (count).
+ */
+#define MAX_CACHE_SIZE 256
+
+static int cache_size;
+static GHashTable *cache;
+static int cache_refcount;
static GSList *server_list = NULL;
+#if defined TIZEN_EXT
+static GSList *server_list_sec = NULL;
+#endif
static GSList *request_list = NULL;
-static GSList *request_pending_list = NULL;
-static guint16 request_id = 0x0000;
static GHashTable *listener_table = NULL;
+static time_t next_refresh;
+static GHashTable *partial_tcp_req_table;
+static guint cache_timer = 0;
+
+#if defined TIZEN_EXT
+static void destroy_server_sec(struct server_data *server);
+static struct server_data *create_server_sec(int index,
+ const char *domain, const char *server,
+ int protocol);
+#endif
+
+static guint16 get_id(void)
+{
+ uint64_t rand;
+
+ __connman_util_get_random(&rand);
+
+ return rand;
+}
static int protocol_offset(int protocol)
{
}
+/*
+ * There is a power and efficiency benefit to have entries
+ * in our cache expire at the same time. To this extend,
+ * we round down the cache valid time to common boundaries.
+ */
+static time_t round_down_ttl(time_t end_time, int ttl)
+{
+ if (ttl < 15)
+ return end_time;
+
+ /* Less than 5 minutes, round to 10 second boundary */
+ if (ttl < 300) {
+ end_time = end_time / 10;
+ end_time = end_time * 10;
+ } else { /* 5 or more minutes, round to 30 seconds */
+ end_time = end_time / 30;
+ end_time = end_time * 30;
+ }
+ return end_time;
+}
+
static struct request_data *find_request(guint16 id)
{
GSList *list;
return NULL;
}
-static struct server_data *find_server(const char *interface,
+static struct server_data *find_server(int index,
const char *server,
int protocol)
{
GSList *list;
- DBG("interface %s server %s", interface, server);
+ debug("index %d server %s proto %d", index, server, protocol);
for (list = server_list; list; list = list->next) {
struct server_data *data = list->data;
- if (interface == NULL && data->interface == NULL &&
- g_str_equal(data->server, server) == TRUE &&
+ if (index < 0 && data->index < 0 &&
+ g_str_equal(data->server, server) &&
data->protocol == protocol)
return data;
- if (interface == NULL ||
- data->interface == NULL || data->server == NULL)
+ if (index < 0 ||
+ data->index < 0 || !data->server)
continue;
- if (g_str_equal(data->interface, interface) == TRUE &&
- g_str_equal(data->server, server) == TRUE &&
+ if (data->index == index &&
+ g_str_equal(data->server, server) &&
data->protocol == protocol)
return data;
}
return NULL;
}
+/* we can keep using the same resolve's */
+static GResolv *ipv4_resolve;
+static GResolv *ipv6_resolve;
+
+static void dummy_resolve_func(GResolvResultStatus status,
+ char **results, gpointer user_data)
+{
+}
+
+/*
+ * Refresh a DNS entry, but also age the hit count a bit */
+static void refresh_dns_entry(struct cache_entry *entry, char *name)
+{
+ int age = 1;
+
+ if (!ipv4_resolve) {
+ ipv4_resolve = g_resolv_new(0);
+ g_resolv_set_address_family(ipv4_resolve, AF_INET);
+ g_resolv_add_nameserver(ipv4_resolve, "127.0.0.1", 53, 0);
+ }
+
+ if (!ipv6_resolve) {
+ ipv6_resolve = g_resolv_new(0);
+ g_resolv_set_address_family(ipv6_resolve, AF_INET6);
+ g_resolv_add_nameserver(ipv6_resolve, "::1", 53, 0);
+ }
+
+ if (!entry->ipv4) {
+ debug("Refreshing A record for %s", name);
+ g_resolv_lookup_hostname(ipv4_resolve, name,
+ dummy_resolve_func, NULL);
+ age = 4;
+ }
+
+ if (!entry->ipv6) {
+ debug("Refreshing AAAA record for %s", name);
+ g_resolv_lookup_hostname(ipv6_resolve, name,
+ dummy_resolve_func, NULL);
+ age = 4;
+ }
+
+ entry->hits -= age;
+ if (entry->hits < 0)
+ entry->hits = 0;
+}
+
+static int dns_name_length(unsigned char *buf)
+{
+ if ((buf[0] & NS_CMPRSFLGS) == NS_CMPRSFLGS) /* compressed name */
+ return 2;
+ return strlen((char *)buf) + 1;
+}
+
+static void update_cached_ttl(unsigned char *buf, int len, int new_ttl)
+{
+ unsigned char *c;
+ uint16_t w;
+ int l;
+
+ /* skip the header */
+ c = buf + 12;
+ len -= 12;
+
+ /* skip the query, which is a name and 2 16 bit words */
+ l = dns_name_length(c);
+ c += l;
+ len -= l;
+ c += 4;
+ len -= 4;
+
+ /* now we get the answer records */
+
+ while (len > 0) {
+ /* first a name */
+ l = dns_name_length(c);
+ c += l;
+ len -= l;
+ if (len < 0)
+ break;
+ /* then type + class, 2 bytes each */
+ c += 4;
+ len -= 4;
+ if (len < 0)
+ break;
+
+ /* now the 4 byte TTL field */
+ c[0] = new_ttl >> 24 & 0xff;
+ c[1] = new_ttl >> 16 & 0xff;
+ c[2] = new_ttl >> 8 & 0xff;
+ c[3] = new_ttl & 0xff;
+ c += 4;
+ len -= 4;
+ if (len < 0)
+ break;
+
+ /* now the 2 byte rdlen field */
+ w = c[0] << 8 | c[1];
+ c += w + 2;
+ len -= w + 2;
+ }
+}
+
+static void send_cached_response(int sk, unsigned char *buf, int len,
+ const struct sockaddr *to, socklen_t tolen,
+ int protocol, int id, uint16_t answers, int ttl)
+{
+ struct domain_hdr *hdr;
+ unsigned char *ptr = buf;
+ int err, offset, dns_len, adj_len = len - 2;
+
+ /*
+ * The cached packet contains always the TCP offset (two bytes)
+ * so skip them for UDP.
+ */
+ switch (protocol) {
+ case IPPROTO_UDP:
+ ptr += 2;
+ len -= 2;
+ dns_len = len;
+ offset = 0;
+ break;
+ case IPPROTO_TCP:
+ offset = 2;
+ dns_len = ptr[0] * 256 + ptr[1];
+ break;
+ default:
+ return;
+ }
+
+ if (len < 12)
+ return;
+
+ hdr = (void *) (ptr + offset);
+
+ hdr->id = id;
+ hdr->qr = 1;
+ hdr->rcode = ns_r_noerror;
+ hdr->ancount = htons(answers);
+ hdr->nscount = 0;
+ hdr->arcount = 0;
+
+ /* if this is a negative reply, we are authoritative */
+ if (answers == 0)
+ hdr->aa = 1;
+ else
+ update_cached_ttl((unsigned char *)hdr, adj_len, ttl);
+
+ debug("sk %d id 0x%04x answers %d ptr %p length %d dns %d",
+ sk, hdr->id, answers, ptr, len, dns_len);
+
+ err = sendto(sk, ptr, len, MSG_NOSIGNAL, to, tolen);
+ if (err < 0) {
+ connman_error("Cannot send cached DNS response: %s",
+ strerror(errno));
+ return;
+ }
-static void send_response(int sk, unsigned char *buf, int len,
+ if (err != len || (dns_len != (len - 2) && protocol == IPPROTO_TCP) ||
+ (dns_len != len && protocol == IPPROTO_UDP))
+ debug("Packet length mismatch, sent %d wanted %d dns %d",
+ err, len, dns_len);
+}
+
+static void send_response(int sk, unsigned char *buf, size_t len,
const struct sockaddr *to, socklen_t tolen,
int protocol)
{
struct domain_hdr *hdr;
int err, offset = protocol_offset(protocol);
- DBG("");
+ debug("sk %d", sk);
if (offset < 0)
return;
- if (len < 12)
+ if (len < sizeof(*hdr) + offset)
return;
hdr = (void *) (buf + offset);
+#if !defined TIZEN_EXT
+ if (offset) {
+ buf[0] = 0;
+ buf[1] = sizeof(*hdr);
+ }
+#endif
- DBG("id 0x%04x qr %d opcode %d", hdr->id, hdr->qr, hdr->opcode);
+ debug("id 0x%04x qr %d opcode %d", hdr->id, hdr->qr, hdr->opcode);
hdr->qr = 1;
- hdr->rcode = 2;
+ hdr->rcode = ns_r_servfail;
+#if !defined TIZEN_EXT
+ hdr->qdcount = 0;
+#endif
hdr->ancount = 0;
hdr->nscount = 0;
hdr->arcount = 0;
- err = sendto(sk, buf, len, 0, to, tolen);
+#if defined TIZEN_EXT
+ err = sendto(sk, buf, len, MSG_NOSIGNAL, to, tolen);
+#else
+ err = sendto(sk, buf, sizeof(*hdr) + offset, MSG_NOSIGNAL, to, tolen);
+#endif
if (err < 0) {
- connman_error("Failed to send DNS response: %s",
- strerror(errno));
+ connman_error("Failed to send DNS response to %d: %s",
+ sk, strerror(errno));
return;
}
}
+static int get_req_udp_socket(struct request_data *req)
+{
+ GIOChannel *channel;
+
+ if (req->family == AF_INET)
+ channel = req->ifdata->udp4_listener_channel;
+ else
+ channel = req->ifdata->udp6_listener_channel;
+
+ if (!channel)
+ return -1;
+
+ return g_io_channel_unix_get_fd(channel);
+}
+
+static void destroy_request_data(struct request_data *req)
+{
+ if (req->timeout > 0)
+ g_source_remove(req->timeout);
+
+ g_free(req->resp);
+ g_free(req->request);
+ g_free(req->name);
+ g_free(req);
+}
+
static gboolean request_timeout(gpointer user_data)
{
struct request_data *req = user_data;
- struct listener_data *ifdata;
-
- DBG("id 0x%04x", req->srcid);
+ struct sockaddr *sa;
+ int sk;
- if (req == NULL)
+ if (!req)
return FALSE;
- ifdata = req->ifdata;
+ debug("id 0x%04x", req->srcid);
request_list = g_slist_remove(request_list, req);
- req->numserv--;
- if (req->resplen > 0 && req->resp != NULL) {
- int sk, err;
+ if (req->protocol == IPPROTO_UDP) {
+ sk = get_req_udp_socket(req);
+ sa = &req->sa;
+ } else if (req->protocol == IPPROTO_TCP) {
+ sk = req->client_sk;
+ sa = NULL;
+ } else
+ goto out;
- sk = g_io_channel_unix_get_fd(ifdata->udp_listener_channel);
+ if (req->resplen > 0 && req->resp) {
+ /*
+ * Here we have received at least one reply (probably telling
+ * "not found" result), so send that back to client instead
+ * of more fatal server failed error.
+ */
+ if (sk >= 0)
+ sendto(sk, req->resp, req->resplen, MSG_NOSIGNAL,
+ sa, req->sa_len);
- err = sendto(sk, req->resp, req->resplen, 0,
- &req->sa, req->sa_len);
- if (err < 0)
- return FALSE;
- } else if (req->request && req->numserv == 0) {
+ } else if (req->request) {
+ /*
+ * There was not reply from server at all.
+ */
struct domain_hdr *hdr;
- if (req->protocol == IPPROTO_TCP) {
- hdr = (void *) (req->request + 2);
- hdr->id = req->srcid;
- send_response(req->client_sk, req->request,
- req->request_len, NULL, 0, IPPROTO_TCP);
+ hdr = (void *)(req->request + protocol_offset(req->protocol));
+ hdr->id = req->srcid;
- } else if (req->protocol == IPPROTO_UDP) {
- int sk;
-
- hdr = (void *) (req->request);
- hdr->id = req->srcid;
- sk = g_io_channel_unix_get_fd(
- ifdata->udp_listener_channel);
+ if (sk >= 0)
send_response(sk, req->request, req->request_len,
- &req->sa, req->sa_len, IPPROTO_UDP);
- }
+ sa, req->sa_len, req->protocol);
}
- g_free(req->resp);
- g_free(req);
+ /*
+ * We cannot leave TCP client hanging so just kick it out
+ * if we get a request timeout from server.
+ */
+ if (req->protocol == IPPROTO_TCP) {
+ debug("client %d removed", req->client_sk);
+ g_hash_table_remove(partial_tcp_req_table,
+ GINT_TO_POINTER(req->client_sk));
+ }
+
+out:
+ req->timeout = 0;
+ destroy_request_data(req);
return FALSE;
}
const char *query, const char *domain)
{
unsigned char *ptr = buf;
- char *offset;
int len;
- DBG("query %s domain %s", query, domain);
+ debug("query %s domain %s", query, domain);
- offset = (char *) query;
- while (offset != NULL) {
- char *tmp;
+ while (query) {
+ const char *tmp;
- tmp = strchr(offset, '.');
- if (tmp == NULL) {
- len = strlen(offset);
+ tmp = strchr(query, '.');
+ if (!tmp) {
+ len = strlen(query);
if (len == 0)
break;
*ptr = len;
- memcpy(ptr + 1, offset, len);
+ memcpy(ptr + 1, query, len);
ptr += len + 1;
break;
}
- *ptr = tmp - offset;
- memcpy(ptr + 1, offset, tmp - offset);
- ptr += tmp - offset + 1;
+ *ptr = tmp - query;
+ memcpy(ptr + 1, query, tmp - query);
+ ptr += tmp - query + 1;
- offset = tmp + 1;
+ query = tmp + 1;
}
- offset = (char *) domain;
- while (offset != NULL) {
- char *tmp;
+ while (domain) {
+ const char *tmp;
- tmp = strchr(offset, '.');
- if (tmp == NULL) {
- len = strlen(offset);
+ tmp = strchr(domain, '.');
+ if (!tmp) {
+ len = strlen(domain);
if (len == 0)
break;
*ptr = len;
- memcpy(ptr + 1, offset, len);
+ memcpy(ptr + 1, domain, len);
ptr += len + 1;
break;
}
- *ptr = tmp - offset;
- memcpy(ptr + 1, offset, tmp - offset);
- ptr += tmp - offset + 1;
+ *ptr = tmp - domain;
+ memcpy(ptr + 1, domain, tmp - domain);
+ ptr += tmp - domain + 1;
- offset = tmp + 1;
+ domain = tmp + 1;
}
*ptr++ = 0x00;
return ptr - buf;
}
-static int ns_resolv(struct server_data *server, struct request_data *req,
- gpointer request, gpointer name)
+static bool cache_check_is_valid(struct cache_data *data,
+ time_t current_time)
{
- GList *list;
- int sk, err;
- char *dot, *lookup = (char *) name;
+ if (!data)
+ return false;
- sk = g_io_channel_unix_get_fd(server->channel);
+ if (data->cache_until < current_time)
+ return false;
- err = send(sk, request, req->request_len, 0);
+ return true;
+}
- req->numserv++;
+/*
+ * remove stale cached entries so that they can be refreshed
+ */
+static void cache_enforce_validity(struct cache_entry *entry)
+{
+ time_t current_time = time(NULL);
- /* If we have more than one dot, we don't add domains */
- dot = strchr(lookup, '.');
- if (dot != NULL && dot != lookup + strlen(lookup) - 1)
- return 0;
+ if (!cache_check_is_valid(entry->ipv4, current_time)
+ && entry->ipv4) {
+ debug("cache timeout \"%s\" type A", entry->key);
+ g_free(entry->ipv4->data);
+ g_free(entry->ipv4);
+ entry->ipv4 = NULL;
- if (server->domains != NULL && server->domains->data != NULL)
- req->append_domain = TRUE;
+ }
- for (list = server->domains; list; list = list->next) {
- char *domain;
- unsigned char alt[1024];
- struct domain_hdr *hdr = (void *) &alt;
- int altlen, domlen, offset;
+ if (!cache_check_is_valid(entry->ipv6, current_time)
+ && entry->ipv6) {
+ debug("cache timeout \"%s\" type AAAA", entry->key);
+ g_free(entry->ipv6->data);
+ g_free(entry->ipv6);
+ entry->ipv6 = NULL;
+ }
+}
- domain = list->data;
+static uint16_t cache_check_validity(char *question, uint16_t type,
+ struct cache_entry *entry)
+{
+ time_t current_time = time(NULL);
+ bool want_refresh = false;
- if (domain == NULL)
- continue;
+ /*
+ * if we have a popular entry, we want a refresh instead of
+ * total destruction of the entry.
+ */
+ if (entry->hits > 2)
+ want_refresh = true;
- offset = protocol_offset(server->protocol);
- if (offset < 0)
- return offset;
+ cache_enforce_validity(entry);
- domlen = strlen(domain) + 1;
- if (domlen < 5)
- return -EINVAL;
+ switch (type) {
+ case 1: /* IPv4 */
+ if (!cache_check_is_valid(entry->ipv4, current_time)) {
+ debug("cache %s \"%s\" type A", entry->ipv4 ?
+ "timeout" : "entry missing", question);
- alt[offset] = req->altid & 0xff;
- alt[offset + 1] = req->altid >> 8;
+ if (want_refresh)
+ entry->want_refresh = true;
- memcpy(alt + offset + 2, request + offset + 2, 10);
- hdr->qdcount = htons(1);
+ /*
+ * We do not remove cache entry if there is still
+ * valid IPv6 entry found in the cache.
+ */
+ if (!cache_check_is_valid(entry->ipv6, current_time) && !want_refresh) {
+ g_hash_table_remove(cache, question);
+ type = 0;
+ }
+ }
+ break;
- altlen = append_query(alt + offset + 12, sizeof(alt) - 12,
- name, domain);
- if (altlen < 0)
- return -EINVAL;
+ case 28: /* IPv6 */
+ if (!cache_check_is_valid(entry->ipv6, current_time)) {
+ debug("cache %s \"%s\" type AAAA", entry->ipv6 ?
+ "timeout" : "entry missing", question);
- altlen += 12;
+ if (want_refresh)
+ entry->want_refresh = true;
- memcpy(alt + offset + altlen,
- request + offset + altlen - domlen,
- req->request_len - altlen - offset + domlen);
+ if (!cache_check_is_valid(entry->ipv4, current_time) && !want_refresh) {
+ g_hash_table_remove(cache, question);
+ type = 0;
+ }
+ }
+ break;
+ }
- if (server->protocol == IPPROTO_TCP) {
- int req_len = req->request_len + domlen - 2;
+ return type;
+}
- alt[0] = (req_len >> 8) & 0xff;
- alt[1] = req_len & 0xff;
- }
+static void cache_element_destroy(gpointer value)
+{
+ struct cache_entry *entry = value;
- err = send(sk, alt, req->request_len + domlen, 0);
- if (err < 0)
- return -EIO;
+ if (!entry)
+ return;
- req->numserv++;
+ if (entry->ipv4) {
+ g_free(entry->ipv4->data);
+ g_free(entry->ipv4);
}
- return 0;
+ if (entry->ipv6) {
+ g_free(entry->ipv6->data);
+ g_free(entry->ipv6);
+ }
+
+ g_free(entry->key);
+ g_free(entry);
+
+ if (--cache_size < 0)
+ cache_size = 0;
}
-static int forward_dns_reply(unsigned char *reply, int reply_len, int protocol)
+static gboolean try_remove_cache(gpointer user_data)
{
- struct domain_hdr *hdr;
- struct request_data *req;
- int dns_id, sk, err, offset = protocol_offset(protocol);
- struct listener_data *ifdata;
+ cache_timer = 0;
- if (offset < 0)
- return offset;
+ if (__sync_fetch_and_sub(&cache_refcount, 1) == 1) {
+ debug("No cache users, removing it.");
- hdr = (void *)(reply + offset);
- dns_id = reply[offset] | reply[offset + 1] << 8;
+ g_hash_table_destroy(cache);
+ cache = NULL;
+ }
- DBG("Received %d bytes (id 0x%04x)", reply_len, dns_id);
+ return FALSE;
+}
- req = find_request(dns_id);
- if (req == NULL)
- return -EINVAL;
+static void create_cache(void)
+{
+ if (__sync_fetch_and_add(&cache_refcount, 1) == 0)
+ cache = g_hash_table_new_full(g_str_hash,
+ g_str_equal,
+ NULL,
+ cache_element_destroy);
+}
- DBG("id 0x%04x rcode %d", hdr->id, hdr->rcode);
+static struct cache_entry *cache_check(gpointer request, int *qtype, int proto)
+{
+ char *question;
+ struct cache_entry *entry;
+ struct domain_question *q;
+ uint16_t type;
+ int offset, proto_offset;
- ifdata = req->ifdata;
+ if (!request)
+ return NULL;
- reply[offset] = req->srcid & 0xff;
- reply[offset + 1] = req->srcid >> 8;
+ proto_offset = protocol_offset(proto);
+ if (proto_offset < 0)
+ return NULL;
- req->numresp++;
+ question = request + proto_offset + 12;
- if (hdr->rcode == 0 || req->resp == NULL) {
+ offset = strlen(question) + 1;
+ q = (void *) (question + offset);
+ type = ntohs(q->type);
- /*
- * If the domain name was append
- * remove it before forwarding the reply.
- */
- if (req->append_domain == TRUE) {
- unsigned char *ptr;
- uint8_t host_len;
- unsigned int domain_len;
+ /* We only cache either A (1) or AAAA (28) requests */
+ if (type != 1 && type != 28)
+ return NULL;
- /*
- * ptr points to the first char of the hostname.
- * ->hostname.domain.net
- */
- ptr = reply + offset + sizeof(struct domain_hdr);
- host_len = *ptr;
- domain_len = strlen((const char *)ptr) - host_len - 1;
+ if (!cache) {
+ create_cache();
+ return NULL;
+ }
- /*
- * remove the domain name and replaced it by the end
- * of reply.
+ entry = g_hash_table_lookup(cache, question);
+ if (!entry)
+ return NULL;
+
+ type = cache_check_validity(question, type, entry);
+ if (type == 0)
+ return NULL;
+
+ *qtype = type;
+ return entry;
+}
+
+/*
+ * Get a label/name from DNS resource record. The function decompresses the
+ * label if necessary. The function does not convert the name to presentation
+ * form. This means that the result string will contain label lengths instead
+ * of dots between labels. We intentionally do not want to convert to dotted
+ * format so that we can cache the wire format string directly.
+ */
+static int get_name(int counter,
+ unsigned char *pkt, unsigned char *start, unsigned char *max,
+ unsigned char *output, int output_max, int *output_len,
+ unsigned char **end, char *name, size_t max_name, int *name_len)
+{
+ unsigned char *p;
+
+ /* Limit recursion to 10 (this means up to 10 labels in domain name) */
+ if (counter > 10)
+ return -EINVAL;
+
+ p = start;
+ while (*p) {
+ if ((*p & NS_CMPRSFLGS) == NS_CMPRSFLGS) {
+ uint16_t offset = (*p & 0x3F) * 256 + *(p + 1);
+
+ if (offset >= max - pkt)
+ return -ENOBUFS;
+
+ if (!*end)
+ *end = p + 2;
+
+ return get_name(counter + 1, pkt, pkt + offset, max,
+ output, output_max, output_len, end,
+ name, max_name, name_len);
+ } else {
+ unsigned label_len = *p;
+
+ if (pkt + label_len > max)
+ return -ENOBUFS;
+
+ if (*output_len > output_max)
+ return -ENOBUFS;
+
+ if ((*name_len + 1 + label_len + 1) > max_name)
+ return -ENOBUFS;
+
+ /*
+ * We need the original name in order to check
+ * if this answer is the correct one.
+ */
+ name[(*name_len)++] = label_len;
+ memcpy(name + *name_len, p + 1, label_len + 1);
+ *name_len += label_len;
+
+ /* We compress the result */
+ output[0] = NS_CMPRSFLGS;
+ output[1] = 0x0C;
+ *output_len = 2;
+
+ p += label_len + 1;
+
+ if (!*end)
+ *end = p;
+
+ if (p >= max)
+ return -ENOBUFS;
+ }
+ }
+
+ return 0;
+}
+
+static int parse_rr(unsigned char *buf, unsigned char *start,
+ unsigned char *max,
+ unsigned char *response, unsigned int *response_size,
+ uint16_t *type, uint16_t *class, int *ttl, int *rdlen,
+ unsigned char **end,
+ char *name, size_t max_name)
+{
+ struct domain_rr *rr;
+ int err, offset;
+ int name_len = 0, output_len = 0, max_rsp = *response_size;
+
+ err = get_name(0, buf, start, max, response, max_rsp,
+ &output_len, end, name, max_name, &name_len);
+ if (err < 0)
+ return err;
+
+ offset = output_len;
+
+ if ((unsigned int) offset > *response_size)
+ return -ENOBUFS;
+
+ rr = (void *) (*end);
+
+ if (!rr)
+ return -EINVAL;
+
+ *type = ntohs(rr->type);
+ *class = ntohs(rr->class);
+ *ttl = ntohl(rr->ttl);
+ *rdlen = ntohs(rr->rdlen);
+
+ if (*ttl < 0)
+ return -EINVAL;
+
+ memcpy(response + offset, *end, sizeof(struct domain_rr));
+
+ offset += sizeof(struct domain_rr);
+ *end += sizeof(struct domain_rr);
+
+ if ((unsigned int) (offset + *rdlen) > *response_size)
+ return -ENOBUFS;
+
+ memcpy(response + offset, *end, *rdlen);
+
+ *end += *rdlen;
+
+ *response_size = offset + *rdlen;
+
+ return 0;
+}
+
+static bool check_alias(GSList *aliases, char *name)
+{
+ GSList *list;
+
+ if (aliases) {
+ for (list = aliases; list; list = list->next) {
+ int len = strlen((char *)list->data);
+ if (strncmp((char *)list->data, name, len) == 0)
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static int parse_response(unsigned char *buf, int buflen,
+ char *question, int qlen,
+ uint16_t *type, uint16_t *class, int *ttl,
+ unsigned char *response, unsigned int *response_len,
+ uint16_t *answers)
+{
+ struct domain_hdr *hdr = (void *) buf;
+ struct domain_question *q;
+ unsigned char *ptr;
+ uint16_t qdcount = ntohs(hdr->qdcount);
+ uint16_t ancount = ntohs(hdr->ancount);
+ int err, i;
+ uint16_t qtype, qclass;
+ unsigned char *next = NULL;
+ unsigned int maxlen = *response_len;
+ GSList *aliases = NULL, *list;
+ char name[NS_MAXDNAME + 1];
+
+ if (buflen < 12)
+ return -EINVAL;
+
+ debug("qr %d qdcount %d", hdr->qr, qdcount);
+
+ /* We currently only cache responses where question count is 1 */
+ if (hdr->qr != 1 || qdcount != 1)
+ return -EINVAL;
+
+ ptr = buf + sizeof(struct domain_hdr);
+
+ strncpy(question, (char *) ptr, qlen);
+ qlen = strlen(question);
+ ptr += qlen + 1; /* skip \0 */
+
+ q = (void *) ptr;
+ qtype = ntohs(q->type);
+
+ /* We cache only A and AAAA records */
+ if (qtype != 1 && qtype != 28)
+ return -ENOMSG;
+
+ qclass = ntohs(q->class);
+
+ ptr += 2 + 2; /* ptr points now to answers */
+
+ err = -ENOMSG;
+ *response_len = 0;
+ *answers = 0;
+
+ memset(name, 0, sizeof(name));
+
+ /*
+ * We have a bunch of answers (like A, AAAA, CNAME etc) to
+ * A or AAAA question. We traverse the answers and parse the
+ * resource records. Only A and AAAA records are cached, all
+ * the other records in answers are skipped.
+ */
+ for (i = 0; i < ancount; i++) {
+ /*
+ * Get one address at a time to this buffer.
+ * The max size of the answer is
+ * 2 (pointer) + 2 (type) + 2 (class) +
+ * 4 (ttl) + 2 (rdlen) + addr (16 or 4) = 28
+ * for A or AAAA record.
+ * For CNAME the size can be bigger.
+ */
+ unsigned char rsp[NS_MAXCDNAME];
+ unsigned int rsp_len = sizeof(rsp) - 1;
+ int ret, rdlen;
+
+ memset(rsp, 0, sizeof(rsp));
+
+ ret = parse_rr(buf, ptr, buf + buflen, rsp, &rsp_len,
+ type, class, ttl, &rdlen, &next, name,
+ sizeof(name) - 1);
+ if (ret != 0) {
+ err = ret;
+ goto out;
+ }
+
+ /*
+ * Now rsp contains compressed or uncompressed resource
+ * record. Next we check if this record answers the question.
+ * The name var contains the uncompressed label.
+ * One tricky bit is the CNAME records as they alias
+ * the name we might be interested in.
+ */
+
+ /*
+ * Go to next answer if the class is not the one we are
+ * looking for.
+ */
+ if (*class != qclass) {
+ ptr = next;
+ next = NULL;
+ continue;
+ }
+
+ /*
+ * Try to resolve aliases also, type is CNAME(5).
+ * This is important as otherwise the aliased names would not
+ * be cached at all as the cache would not contain the aliased
+ * question.
+ *
+ * If any CNAME is found in DNS packet, then we cache the alias
+ * IP address instead of the question (as the server
+ * said that question has only an alias).
+ * This means in practice that if e.g., ipv6.google.com is
+ * queried, DNS server returns CNAME of that name which is
+ * ipv6.l.google.com. We then cache the address of the CNAME
+ * but return the question name to client. So the alias
+ * status of the name is not saved in cache and thus not
+ * returned to the client. We do not return DNS packets from
+ * cache to client saying that ipv6.google.com is an alias to
+ * ipv6.l.google.com but we return instead a DNS packet that
+ * says ipv6.google.com has address xxx which is in fact the
+ * address of ipv6.l.google.com. For caching purposes this
+ * should not cause any issues.
+ */
+ if (*type == 5 && strncmp(question, name, qlen) == 0) {
+ /*
+ * So now the alias answered the question. This is
+ * not very useful from caching point of view as
+ * the following A or AAAA records will not match the
+ * question. We need to find the real A/AAAA record
+ * of the alias and cache that.
+ */
+ unsigned char *end = NULL;
+ int name_len = 0, output_len = 0;
+
+ memset(rsp, 0, sizeof(rsp));
+ rsp_len = sizeof(rsp) - 1;
+
+ /*
+ * Alias is in rdata part of the message,
+ * and next-rdlen points to it. So we need to get
+ * the real name of the alias.
+ */
+ ret = get_name(0, buf, next - rdlen, buf + buflen,
+ rsp, rsp_len, &output_len, &end,
+ name, sizeof(name) - 1, &name_len);
+ if (ret != 0) {
+ /* just ignore the error at this point */
+ ptr = next;
+ next = NULL;
+ continue;
+ }
+
+ /*
+ * We should now have the alias of the entry we might
+ * want to cache. Just remember it for a while.
+ * We check the alias list when we have parsed the
+ * A or AAAA record.
+ */
+ aliases = g_slist_prepend(aliases, g_strdup(name));
+
+ ptr = next;
+ next = NULL;
+ continue;
+ }
+
+ if (*type == qtype) {
+ /*
+ * We found correct type (A or AAAA)
+ */
+ if (check_alias(aliases, name) ||
+ (!aliases && strncmp(question, name,
+ qlen) == 0)) {
+ /*
+ * We found an alias or the name of the rr
+ * matches the question. If so, we append
+ * the compressed label to the cache.
+ * The end result is a response buffer that
+ * will contain one or more cached and
+ * compressed resource records.
+ */
+ if (*response_len + rsp_len > maxlen) {
+ err = -ENOBUFS;
+ goto out;
+ }
+ memcpy(response + *response_len, rsp, rsp_len);
+ *response_len += rsp_len;
+ (*answers)++;
+ err = 0;
+ }
+ }
+
+ ptr = next;
+ next = NULL;
+ }
+
+out:
+ for (list = aliases; list; list = list->next)
+ g_free(list->data);
+ g_slist_free(aliases);
+
+ return err;
+}
+
+struct cache_timeout {
+ time_t current_time;
+ int max_timeout;
+ int try_harder;
+};
+
+static gboolean cache_check_entry(gpointer key, gpointer value,
+ gpointer user_data)
+{
+ struct cache_timeout *data = user_data;
+ struct cache_entry *entry = value;
+ int max_timeout;
+
+ /* Scale the number of hits by half as part of cache aging */
+
+ entry->hits /= 2;
+
+ /*
+ * If either IPv4 or IPv6 cached entry has expired, we
+ * remove both from the cache.
+ */
+
+ if (entry->ipv4 && entry->ipv4->timeout > 0) {
+ max_timeout = entry->ipv4->cache_until;
+ if (max_timeout > data->max_timeout)
+ data->max_timeout = max_timeout;
+
+ if (entry->ipv4->cache_until < data->current_time)
+ return TRUE;
+ }
+
+ if (entry->ipv6 && entry->ipv6->timeout > 0) {
+ max_timeout = entry->ipv6->cache_until;
+ if (max_timeout > data->max_timeout)
+ data->max_timeout = max_timeout;
+
+ if (entry->ipv6->cache_until < data->current_time)
+ return TRUE;
+ }
+
+ /*
+ * if we're asked to try harder, also remove entries that have
+ * few hits
+ */
+ if (data->try_harder && entry->hits < 4)
+ return TRUE;
+
+ return FALSE;
+}
+
+static void cache_cleanup(void)
+{
+ static int max_timeout;
+ struct cache_timeout data;
+ int count = 0;
+
+ data.current_time = time(NULL);
+ data.max_timeout = 0;
+ data.try_harder = 0;
+
+ /*
+ * In the first pass, we only remove entries that have timed out.
+ * We use a cache of the first time to expire to do this only
+ * when it makes sense.
+ */
+ if (max_timeout <= data.current_time) {
+ count = g_hash_table_foreach_remove(cache, cache_check_entry,
+ &data);
+ }
+ debug("removed %d in the first pass", count);
+
+ /*
+ * In the second pass, if the first pass turned up blank,
+ * we also expire entries with a low hit count,
+ * while aging the hit count at the same time.
+ */
+ data.try_harder = 1;
+ if (count == 0)
+ count = g_hash_table_foreach_remove(cache, cache_check_entry,
+ &data);
+
+ if (count == 0)
+ /*
+ * If we could not remove anything, then remember
+ * what is the max timeout and do nothing if we
+ * have not yet reached it. This will prevent
+ * constant traversal of the cache if it is full.
+ */
+ max_timeout = data.max_timeout;
+ else
+ max_timeout = 0;
+}
+
+static gboolean cache_invalidate_entry(gpointer key, gpointer value,
+ gpointer user_data)
+{
+ struct cache_entry *entry = value;
+
+ /* first, delete any expired elements */
+ cache_enforce_validity(entry);
+
+ /* if anything is not expired, mark the entry for refresh */
+ if (entry->hits > 0 && (entry->ipv4 || entry->ipv6))
+ entry->want_refresh = true;
+
+ /* delete the cached data */
+ if (entry->ipv4) {
+ g_free(entry->ipv4->data);
+ g_free(entry->ipv4);
+ entry->ipv4 = NULL;
+ }
+
+ if (entry->ipv6) {
+ g_free(entry->ipv6->data);
+ g_free(entry->ipv6);
+ entry->ipv6 = NULL;
+ }
+
+ /* keep the entry if we want it refreshed, delete it otherwise */
+ if (entry->want_refresh)
+ return FALSE;
+ else
+ return TRUE;
+}
+
+/*
+ * cache_invalidate is called from places where the DNS landscape
+ * has changed, say because connections are added or we entered a VPN.
+ * The logic is to wipe all cache data, but mark all non-expired
+ * parts of the cache for refresh rather than deleting the whole cache.
+ */
+static void cache_invalidate(void)
+{
+ debug("Invalidating the DNS cache %p", cache);
+
+ if (!cache)
+ return;
+
+ g_hash_table_foreach_remove(cache, cache_invalidate_entry, NULL);
+}
+
+static void cache_refresh_entry(struct cache_entry *entry)
+{
+
+ cache_enforce_validity(entry);
+
+ if (entry->hits > 2 && !entry->ipv4)
+ entry->want_refresh = true;
+ if (entry->hits > 2 && !entry->ipv6)
+ entry->want_refresh = true;
+
+ if (entry->want_refresh) {
+ char *c;
+ char dns_name[NS_MAXDNAME + 1];
+ entry->want_refresh = false;
+
+ /* turn a DNS name into a hostname with dots */
+ strncpy(dns_name, entry->key, NS_MAXDNAME);
+ c = dns_name;
+ while (c && *c) {
+ int jump;
+ jump = *c;
+ *c = '.';
+ c += jump + 1;
+ }
+ debug("Refreshing %s\n", dns_name);
+ /* then refresh the hostname */
+ refresh_dns_entry(entry, &dns_name[1]);
+ }
+}
+
+static void cache_refresh_iterator(gpointer key, gpointer value,
+ gpointer user_data)
+{
+ struct cache_entry *entry = value;
+
+ cache_refresh_entry(entry);
+}
+
+static void cache_refresh(void)
+{
+ if (!cache)
+ return;
+
+ g_hash_table_foreach(cache, cache_refresh_iterator, NULL);
+}
+
+static int reply_query_type(unsigned char *msg, int len)
+{
+ unsigned char *c;
+ int l;
+ int type;
+
+ /* skip the header */
+ c = msg + sizeof(struct domain_hdr);
+ len -= sizeof(struct domain_hdr);
+
+ if (len < 0)
+ return 0;
+
+ /* now the query, which is a name and 2 16 bit words */
+ l = dns_name_length(c);
+ c += l;
+ type = c[0] << 8 | c[1];
+
+ return type;
+}
+
+static int cache_update(struct server_data *srv, unsigned char *msg,
+ unsigned int msg_len)
+{
+ int offset = protocol_offset(srv->protocol);
+ int err, qlen, ttl = 0;
+ uint16_t answers = 0, type = 0, class = 0;
+ struct domain_hdr *hdr = (void *)(msg + offset);
+ struct domain_question *q;
+ struct cache_entry *entry;
+ struct cache_data *data;
+ char question[NS_MAXDNAME + 1];
+ unsigned char response[NS_MAXDNAME + 1];
+ unsigned char *ptr;
+ unsigned int rsplen;
+ bool new_entry = true;
+ time_t current_time;
+
+ if (cache_size >= MAX_CACHE_SIZE) {
+ cache_cleanup();
+ if (cache_size >= MAX_CACHE_SIZE)
+ return 0;
+ }
+
+ current_time = time(NULL);
+
+ /* don't do a cache refresh more than twice a minute */
+ if (next_refresh < current_time) {
+ cache_refresh();
+ next_refresh = current_time + 30;
+ }
+
+ if (offset < 0)
+ return 0;
+
+ debug("offset %d hdr %p msg %p rcode %d", offset, hdr, msg, hdr->rcode);
+
+ /* Continue only if response code is 0 (=ok) */
+ if (hdr->rcode != ns_r_noerror)
+ return 0;
+
+ if (!cache)
+ create_cache();
+
+ rsplen = sizeof(response) - 1;
+ question[sizeof(question) - 1] = '\0';
+
+ err = parse_response(msg + offset, msg_len - offset,
+ question, sizeof(question) - 1,
+ &type, &class, &ttl,
+ response, &rsplen, &answers);
+
+ /*
+ * special case: if we do a ipv6 lookup and get no result
+ * for a record that's already in our ipv4 cache.. we want
+ * to cache the negative response.
+ */
+ if ((err == -ENOMSG || err == -ENOBUFS) &&
+ reply_query_type(msg + offset,
+ msg_len - offset) == 28) {
+ entry = g_hash_table_lookup(cache, question);
+ if (entry && entry->ipv4 && !entry->ipv6) {
+ int cache_offset = 0;
+
+ data = g_try_new(struct cache_data, 1);
+ if (!data)
+ return -ENOMEM;
+ data->inserted = entry->ipv4->inserted;
+ data->type = type;
+ data->answers = ntohs(hdr->ancount);
+ data->timeout = entry->ipv4->timeout;
+ if (srv->protocol == IPPROTO_UDP)
+ cache_offset = 2;
+ data->data_len = msg_len + cache_offset;
+ data->data = ptr = g_malloc(data->data_len);
+ ptr[0] = (data->data_len - 2) / 256;
+ ptr[1] = (data->data_len - 2) - ptr[0] * 256;
+ if (srv->protocol == IPPROTO_UDP)
+ ptr += 2;
+ data->valid_until = entry->ipv4->valid_until;
+ data->cache_until = entry->ipv4->cache_until;
+ memcpy(ptr, msg, msg_len);
+ entry->ipv6 = data;
+ /*
+ * we will get a "hit" when we serve the response
+ * out of the cache
+ */
+ entry->hits--;
+ if (entry->hits < 0)
+ entry->hits = 0;
+ return 0;
+ }
+ }
+
+ if (err < 0 || ttl == 0)
+ return 0;
+
+ qlen = strlen(question);
+
+ /*
+ * If the cache contains already data, check if the
+ * type of the cached data is the same and do not add
+ * to cache if data is already there.
+ * This is needed so that we can cache both A and AAAA
+ * records for the same name.
+ */
+ entry = g_hash_table_lookup(cache, question);
+ if (!entry) {
+ entry = g_try_new(struct cache_entry, 1);
+ if (!entry)
+ return -ENOMEM;
+
+ data = g_try_new(struct cache_data, 1);
+ if (!data) {
+ g_free(entry);
+ return -ENOMEM;
+ }
+
+ entry->key = g_strdup(question);
+ entry->ipv4 = entry->ipv6 = NULL;
+ entry->want_refresh = false;
+ entry->hits = 0;
+
+ if (type == 1)
+ entry->ipv4 = data;
+ else
+ entry->ipv6 = data;
+ } else {
+ if (type == 1 && entry->ipv4)
+ return 0;
+
+ if (type == 28 && entry->ipv6)
+ return 0;
+
+ data = g_try_new(struct cache_data, 1);
+ if (!data)
+ return -ENOMEM;
+
+ if (type == 1)
+ entry->ipv4 = data;
+ else
+ entry->ipv6 = data;
+
+ /*
+ * compensate for the hit we'll get for serving
+ * the response out of the cache
+ */
+ entry->hits--;
+ if (entry->hits < 0)
+ entry->hits = 0;
+
+ new_entry = false;
+ }
+
+ if (ttl < MIN_CACHE_TTL)
+ ttl = MIN_CACHE_TTL;
+
+ data->inserted = current_time;
+ data->type = type;
+ data->answers = answers;
+ data->timeout = ttl;
+ /*
+ * The "2" in start of the length is the TCP offset. We allocate it
+ * here even for UDP packet because it simplifies the sending
+ * of cached packet.
+ */
+ data->data_len = 2 + 12 + qlen + 1 + 2 + 2 + rsplen;
+ data->data = ptr = g_malloc(data->data_len);
+ data->valid_until = current_time + ttl;
+
+ /*
+ * Restrict the cached DNS record TTL to some sane value
+ * in order to prevent data staying in the cache too long.
+ */
+ if (ttl > MAX_CACHE_TTL)
+ ttl = MAX_CACHE_TTL;
+
+ data->cache_until = round_down_ttl(current_time + ttl, ttl);
+
+ if (!data->data) {
+ g_free(entry->key);
+ g_free(data);
+ g_free(entry);
+ return -ENOMEM;
+ }
+
+ /*
+ * We cache the two extra bytes at the start of the message
+ * in a TCP packet. When sending UDP packet, we skip the first
+ * two bytes. This way we do not need to know the format
+ * (UDP/TCP) of the cached message.
+ */
+ if (srv->protocol == IPPROTO_UDP)
+ memcpy(ptr + 2, msg, offset + 12);
+ else
+ memcpy(ptr, msg, offset + 12);
+
+ ptr[0] = (data->data_len - 2) / 256;
+ ptr[1] = (data->data_len - 2) - ptr[0] * 256;
+ if (srv->protocol == IPPROTO_UDP)
+ ptr += 2;
+
+ memcpy(ptr + offset + 12, question, qlen + 1); /* copy also the \0 */
+
+ q = (void *) (ptr + offset + 12 + qlen + 1);
+ q->type = htons(type);
+ q->class = htons(class);
+ memcpy(ptr + offset + 12 + qlen + 1 + sizeof(struct domain_question),
+ response, rsplen);
+
+ if (new_entry) {
+ g_hash_table_replace(cache, entry->key, entry);
+ cache_size++;
+ }
+
+ debug("cache %d %squestion \"%s\" type %d ttl %d size %zd packet %u "
+ "dns len %u",
+ cache_size, new_entry ? "new " : "old ",
+ question, type, ttl,
+ sizeof(*entry) + sizeof(*data) + data->data_len + qlen,
+ data->data_len,
+ srv->protocol == IPPROTO_TCP ?
+ (unsigned int)(data->data[0] * 256 + data->data[1]) :
+ data->data_len);
+
+ return 0;
+}
+
+static int ns_resolv(struct server_data *server, struct request_data *req,
+ gpointer request, gpointer name)
+{
+ GList *list;
+ int sk, err, type = 0;
+ char *dot, *lookup = (char *) name;
+ struct cache_entry *entry;
+
+ entry = cache_check(request, &type, req->protocol);
+ if (entry) {
+ int ttl_left = 0;
+ struct cache_data *data;
+
+ debug("cache hit %s type %s", lookup, type == 1 ? "A" : "AAAA");
+ if (type == 1)
+ data = entry->ipv4;
+ else
+ data = entry->ipv6;
+
+ if (data) {
+ ttl_left = data->valid_until - time(NULL);
+ entry->hits++;
+ }
+
+ if (data && req->protocol == IPPROTO_TCP) {
+ send_cached_response(req->client_sk, data->data,
+ data->data_len, NULL, 0, IPPROTO_TCP,
+ req->srcid, data->answers, ttl_left);
+ return 1;
+ }
+
+ if (data && req->protocol == IPPROTO_UDP) {
+ int udp_sk = get_req_udp_socket(req);
+
+ if (udp_sk < 0)
+ return -EIO;
+
+ send_cached_response(udp_sk, data->data,
+ data->data_len, &req->sa, req->sa_len,
+ IPPROTO_UDP, req->srcid, data->answers,
+ ttl_left);
+ return 1;
+ }
+ }
+
+#if defined TIZEN_EXT
+ if (server->protocol == IPPROTO_UDP) {
+ GList *domains;
+ struct server_data *new_server = NULL;
+
+ new_server = create_server_sec(server->index, NULL,
+ server->server, IPPROTO_UDP);
+
+ if (new_server != NULL) {
+ for (domains = server->domains; domains;
+ domains = domains->next) {
+ char *dom = domains->data;
+
+ DBG("Adding domain %s to %s",
+ dom, new_server->server);
+
+ new_server->domains = g_list_append(
+ new_server->domains,
+ g_strdup(dom));
+ }
+
+ server = new_server;
+ }
+ }
+#endif
+ sk = g_io_channel_unix_get_fd(server->channel);
+
+ err = sendto(sk, request, req->request_len, MSG_NOSIGNAL,
+ server->server_addr, server->server_addr_len);
+ if (err < 0) {
+ debug("Cannot send message to server %s sock %d "
+ "protocol %d (%s/%d)",
+ server->server, sk, server->protocol,
+ strerror(errno), errno);
+ return -EIO;
+ }
+
+ req->numserv++;
+
+ /* If we have more than one dot, we don't add domains */
+ dot = strchr(lookup, '.');
+ if (dot && dot != lookup + strlen(lookup) - 1)
+ return 0;
+
+ if (server->domains && server->domains->data)
+ req->append_domain = true;
+
+ for (list = server->domains; list; list = list->next) {
+ char *domain;
+ unsigned char alt[1024];
+ struct domain_hdr *hdr = (void *) &alt;
+ int altlen, domlen, offset;
+
+ domain = list->data;
+
+ if (!domain)
+ continue;
+
+ offset = protocol_offset(server->protocol);
+ if (offset < 0)
+ return offset;
+
+ domlen = strlen(domain) + 1;
+ if (domlen < 5)
+ return -EINVAL;
+
+ alt[offset] = req->altid & 0xff;
+ alt[offset + 1] = req->altid >> 8;
+
+ memcpy(alt + offset + 2, request + offset + 2, 10);
+ hdr->qdcount = htons(1);
+
+ altlen = append_query(alt + offset + 12, sizeof(alt) - 12,
+ name, domain);
+ if (altlen < 0)
+ return -EINVAL;
+
+ altlen += 12;
+
+ memcpy(alt + offset + altlen,
+ request + offset + altlen - domlen,
+ req->request_len - altlen - offset + domlen);
+
+ if (server->protocol == IPPROTO_TCP) {
+ int req_len = req->request_len + domlen - 2;
+
+ alt[0] = (req_len >> 8) & 0xff;
+ alt[1] = req_len & 0xff;
+ }
+
+ debug("req %p dstid 0x%04x altid 0x%04x", req, req->dstid,
+ req->altid);
+
+ err = send(sk, alt, req->request_len + domlen, MSG_NOSIGNAL);
+ if (err < 0)
+ return -EIO;
+
+ req->numserv++;
+ }
+
+ return 0;
+}
+
+static char *convert_label(char *start, char *end, char *ptr, char *uptr,
+ int remaining_len, int *used_comp, int *used_uncomp)
+{
+ int pos, comp_pos;
+ char name[NS_MAXLABEL];
+
+ pos = dn_expand((u_char *)start, (u_char *)end, (u_char *)ptr,
+ name, NS_MAXLABEL);
+ if (pos < 0) {
+ debug("uncompress error [%d/%s]", errno, strerror(errno));
+ goto out;
+ }
+
+ /*
+ * We need to compress back the name so that we get back to internal
+ * label presentation.
+ */
+ comp_pos = dn_comp(name, (u_char *)uptr, remaining_len, NULL, NULL);
+ if (comp_pos < 0) {
+ debug("compress error [%d/%s]", errno, strerror(errno));
+ goto out;
+ }
+
+ *used_comp = pos;
+ *used_uncomp = comp_pos;
+
+ return ptr;
+
+out:
+ return NULL;
+}
+
+static char *uncompress(int16_t field_count, char *start, char *end,
+ char *ptr, char *uncompressed, int uncomp_len,
+ char **uncompressed_ptr)
+{
+ char *uptr = *uncompressed_ptr; /* position in result buffer */
+
+ debug("count %d ptr %p end %p uptr %p", field_count, ptr, end, uptr);
+
+ while (field_count-- > 0 && ptr < end) {
+ int dlen; /* data field length */
+ int ulen; /* uncompress length */
+ int pos; /* position in compressed string */
+ char name[NS_MAXLABEL]; /* tmp label */
+ uint16_t dns_type, dns_class;
+ int comp_pos;
+
+ if (!convert_label(start, end, ptr, name, NS_MAXLABEL,
+ &pos, &comp_pos))
+ goto out;
+
+ /*
+ * Copy the uncompressed resource record, type, class and \0 to
+ * tmp buffer.
+ */
+
+ ulen = strlen(name);
+ strncpy(uptr, name, uncomp_len - (uptr - uncompressed));
+
+ debug("pos %d ulen %d left %d name %s", pos, ulen,
+ (int)(uncomp_len - (uptr - uncompressed)), uptr);
+
+ uptr += ulen;
+ *uptr++ = '\0';
+
+ ptr += pos;
+
+ /*
+ * We copy also the fixed portion of the result (type, class,
+ * ttl, address length and the address)
+ */
+ memcpy(uptr, ptr, NS_RRFIXEDSZ);
+
+ dns_type = uptr[0] << 8 | uptr[1];
+ dns_class = uptr[2] << 8 | uptr[3];
+
+ if (dns_class != ns_c_in)
+ goto out;
+
+ ptr += NS_RRFIXEDSZ;
+ uptr += NS_RRFIXEDSZ;
+
+ /*
+ * Then the variable portion of the result (data length).
+ * Typically this portion is also compressed
+ * so we need to uncompress it also when necessary.
+ */
+ if (dns_type == ns_t_cname) {
+ if (!convert_label(start, end, ptr, uptr,
+ uncomp_len - (uptr - uncompressed),
+ &pos, &comp_pos))
+ goto out;
+
+ uptr[-2] = comp_pos << 8;
+ uptr[-1] = comp_pos & 0xff;
+
+ uptr += comp_pos;
+ ptr += pos;
+
+ } else if (dns_type == ns_t_a || dns_type == ns_t_aaaa) {
+ dlen = uptr[-2] << 8 | uptr[-1];
+
+ if (ptr + dlen > end) {
+ debug("data len %d too long", dlen);
+ goto out;
+ }
+
+ memcpy(uptr, ptr, dlen);
+ uptr += dlen;
+ ptr += dlen;
+
+ } else if (dns_type == ns_t_soa) {
+ int total_len = 0;
+ char *len_ptr;
+
+ /* Primary name server expansion */
+ if (!convert_label(start, end, ptr, uptr,
+ uncomp_len - (uptr - uncompressed),
+ &pos, &comp_pos))
+ goto out;
+
+ total_len += comp_pos;
+ len_ptr = &uptr[-2];
+ ptr += pos;
+ uptr += comp_pos;
+
+ /* Responsible authority's mailbox */
+ if (!convert_label(start, end, ptr, uptr,
+ uncomp_len - (uptr - uncompressed),
+ &pos, &comp_pos))
+ goto out;
+
+ total_len += comp_pos;
+ ptr += pos;
+ uptr += comp_pos;
+
+ /*
+ * Copy rest of the soa fields (serial number,
+ * refresh interval, retry interval, expiration
+ * limit and minimum ttl). They are 20 bytes long.
+ */
+ memcpy(uptr, ptr, 20);
+ uptr += 20;
+ ptr += 20;
+ total_len += 20;
+
+ /*
+ * Finally fix the length of the data part
+ */
+ len_ptr[0] = total_len << 8;
+ len_ptr[1] = total_len & 0xff;
+ }
+
+ *uncompressed_ptr = uptr;
+ }
+
+ return ptr;
+
+out:
+ return NULL;
+}
+
+static int strip_domains(char *name, char *answers, int maxlen)
+{
+ uint16_t data_len;
+ int name_len = strlen(name);
+ char *ptr, *start = answers, *end = answers + maxlen;
+
+ while (maxlen > 0) {
+ ptr = strstr(answers, name);
+ if (ptr) {
+ char *domain = ptr + name_len;
+
+ if (*domain) {
+ int domain_len = strlen(domain);
+
+ memmove(answers + name_len,
+ domain + domain_len,
+ end - (domain + domain_len));
+
+ end -= domain_len;
+ maxlen -= domain_len;
+ }
+ }
+
+ answers += strlen(answers) + 1;
+ answers += 2 + 2 + 4; /* skip type, class and ttl fields */
+
+ data_len = answers[0] << 8 | answers[1];
+ answers += 2; /* skip the length field */
+
+ if (answers + data_len > end)
+ return -EINVAL;
+
+ answers += data_len;
+ maxlen -= answers - ptr;
+ }
+
+ return end - start;
+}
+
+static int forward_dns_reply(unsigned char *reply, int reply_len, int protocol,
+ struct server_data *data)
+{
+ struct domain_hdr *hdr;
+ struct request_data *req;
+ int dns_id, sk, err, offset = protocol_offset(protocol);
+
+ if (offset < 0)
+ return offset;
+
+ hdr = (void *)(reply + offset);
+ dns_id = reply[offset] | reply[offset + 1] << 8;
+
+ debug("Received %d bytes (id 0x%04x)", reply_len, dns_id);
+
+ req = find_request(dns_id);
+ if (!req)
+ return -EINVAL;
+
+ debug("req %p dstid 0x%04x altid 0x%04x rcode %d",
+ req, req->dstid, req->altid, hdr->rcode);
+
+ reply[offset] = req->srcid & 0xff;
+ reply[offset + 1] = req->srcid >> 8;
+
+ req->numresp++;
+
+ if (hdr->rcode == ns_r_noerror || !req->resp) {
+ unsigned char *new_reply = NULL;
+
+ /*
+ * If the domain name was append
+ * remove it before forwarding the reply.
+ * If there were more than one question, then this
+ * domain name ripping can be hairy so avoid that
+ * and bail out in that that case.
+ *
+ * The reason we are doing this magic is that if the
+ * user's DNS client tries to resolv hostname without
+ * domain part, it also expects to get the result without
+ * a domain name part.
+ */
+ if (req->append_domain && ntohs(hdr->qdcount) == 1) {
+ uint16_t domain_len = 0;
+ uint16_t header_len;
+ uint16_t dns_type, dns_class;
+ uint8_t host_len, dns_type_pos;
+ char uncompressed[NS_MAXDNAME], *uptr;
+ char *ptr, *eom = (char *)reply + reply_len;
+
+ /*
+ * ptr points to the first char of the hostname.
+ * ->hostname.domain.net
+ */
+ header_len = offset + sizeof(struct domain_hdr);
+ ptr = (char *)reply + header_len;
+
+ host_len = *ptr;
+ if (host_len > 0)
+ domain_len = strnlen(ptr + 1 + host_len,
+ reply_len - header_len);
+
+ /*
+ * If the query type is anything other than A or AAAA,
+ * then bail out and pass the message as is.
+ * We only want to deal with IPv4 or IPv6 addresses.
*/
- memmove(ptr + host_len + 1,
- ptr + host_len + domain_len + 1,
- reply_len - (ptr - reply + domain_len));
+ dns_type_pos = host_len + 1 + domain_len + 1;
+
+ dns_type = ptr[dns_type_pos] << 8 |
+ ptr[dns_type_pos + 1];
+ dns_class = ptr[dns_type_pos + 2] << 8 |
+ ptr[dns_type_pos + 3];
+ if (dns_type != ns_t_a && dns_type != ns_t_aaaa &&
+ dns_class != ns_c_in) {
+ debug("Pass msg dns type %d class %d",
+ dns_type, dns_class);
+ goto pass;
+ }
- reply_len = reply_len - domain_len;
+ /*
+ * Remove the domain name and replace it by the end
+ * of reply. Check if the domain is really there
+ * before trying to copy the data. We also need to
+ * uncompress the answers if necessary.
+ * The domain_len can be 0 because if the original
+ * query did not contain a domain name, then we are
+ * sending two packets, first without the domain name
+ * and the second packet with domain name.
+ * The append_domain is set to true even if we sent
+ * the first packet without domain name. In this
+ * case we end up in this branch.
+ */
+ if (domain_len > 0) {
+ int len = host_len + 1;
+ int new_len, fixed_len;
+ char *answers;
+
+ /*
+ * First copy host (without domain name) into
+ * tmp buffer.
+ */
+ uptr = &uncompressed[0];
+ memcpy(uptr, ptr, len);
+
+ uptr[len] = '\0'; /* host termination */
+ uptr += len + 1;
+
+ /*
+ * Copy type and class fields of the question.
+ */
+ ptr += len + domain_len + 1;
+ memcpy(uptr, ptr, NS_QFIXEDSZ);
+
+ /*
+ * ptr points to answers after this
+ */
+ ptr += NS_QFIXEDSZ;
+ uptr += NS_QFIXEDSZ;
+ answers = uptr;
+ fixed_len = answers - uncompressed;
+
+ /*
+ * We then uncompress the result to buffer
+ * so that we can rip off the domain name
+ * part from the question. First answers,
+ * then name server (authority) information,
+ * and finally additional record info.
+ */
+
+ ptr = uncompress(ntohs(hdr->ancount),
+ (char *)reply + offset, eom,
+ ptr, uncompressed, NS_MAXDNAME,
+ &uptr);
+ if (!ptr)
+ goto out;
+
+ ptr = uncompress(ntohs(hdr->nscount),
+ (char *)reply + offset, eom,
+ ptr, uncompressed, NS_MAXDNAME,
+ &uptr);
+ if (!ptr)
+ goto out;
+
+ ptr = uncompress(ntohs(hdr->arcount),
+ (char *)reply + offset, eom,
+ ptr, uncompressed, NS_MAXDNAME,
+ &uptr);
+ if (!ptr)
+ goto out;
+
+ /*
+ * The uncompressed buffer now contains almost
+ * valid response. Final step is to get rid of
+ * the domain name because at least glibc
+ * gethostbyname() implementation does extra
+ * checks and expects to find an answer without
+ * domain name if we asked a query without
+ * domain part. Note that glibc getaddrinfo()
+ * works differently and accepts FQDN in answer
+ */
+ new_len = strip_domains(uncompressed, answers,
+ uptr - answers);
+ if (new_len < 0) {
+ debug("Corrupted packet");
+ return -EINVAL;
+ }
+
+ /*
+ * Because we have now uncompressed the answers
+ * we might have to create a bigger buffer to
+ * hold all that data.
+ */
+
+ reply_len = header_len + new_len + fixed_len;
+
+ new_reply = g_try_malloc(reply_len);
+ if (!new_reply)
+ return -ENOMEM;
+
+ memcpy(new_reply, reply, header_len);
+ memcpy(new_reply + header_len, uncompressed,
+ new_len + fixed_len);
+
+ reply = new_reply;
+ }
}
+ pass:
g_free(req->resp);
req->resplen = 0;
req->resp = g_try_malloc(reply_len);
- if (req->resp == NULL)
+#if defined TIZEN_EXT
+ if (!req->resp) {
+ g_free(new_reply);
+ return -ENOMEM;
+ }
+#else
+ if (!req->resp)
return -ENOMEM;
+#endif
memcpy(req->resp, reply, reply_len);
req->resplen = reply_len;
- }
- if (hdr->rcode > 0 && req->numresp < req->numserv)
- return -EINVAL;
+ cache_update(data, reply, reply_len);
- if (req->timeout > 0)
- g_source_remove(req->timeout);
+ g_free(new_reply);
+ }
+
+out:
+ if (req->numresp < req->numserv) {
+ if (hdr->rcode > ns_r_noerror) {
+ return -EINVAL;
+ } else if (hdr->ancount == 0 && req->append_domain) {
+ return -EINVAL;
+ }
+ }
request_list = g_slist_remove(request_list, req);
if (protocol == IPPROTO_UDP) {
- sk = g_io_channel_unix_get_fd(ifdata->udp_listener_channel);
- err = sendto(sk, req->resp, req->resplen, 0,
- &req->sa, req->sa_len);
+ sk = get_req_udp_socket(req);
+ if (sk < 0) {
+ errno = -EIO;
+ err = -EIO;
+ } else
+ err = sendto(sk, req->resp, req->resplen, 0,
+ &req->sa, req->sa_len);
} else {
sk = req->client_sk;
- err = send(sk, req->resp, req->resplen, 0);
- close(sk);
+ err = send(sk, req->resp, req->resplen, MSG_NOSIGNAL);
}
- g_free(req->resp);
- g_free(req);
+ if (err < 0)
+ debug("Cannot send msg, sk %d proto %d errno %d/%s", sk,
+ protocol, errno, strerror(errno));
+ else
+ debug("proto %d sent %d bytes to %d", protocol, err, sk);
+
+ destroy_request_data(req);
return err;
}
-static void destroy_server(struct server_data *server)
+static void server_destroy_socket(struct server_data *data)
{
- GList *list;
+ debug("index %d server %s proto %d", data->index,
+ data->server, data->protocol);
+
+ if (data->watch > 0) {
+ g_source_remove(data->watch);
+ data->watch = 0;
+ }
- DBG("interface %s server %s", server->interface, server->server);
+ if (data->timeout > 0) {
+ g_source_remove(data->timeout);
+ data->timeout = 0;
+ }
- server_list = g_slist_remove(server_list, server);
+ if (data->channel) {
+ g_io_channel_shutdown(data->channel, TRUE, NULL);
+ g_io_channel_unref(data->channel);
+ data->channel = NULL;
+ }
- if (server->watch > 0)
- g_source_remove(server->watch);
+ g_free(data->incoming_reply);
+ data->incoming_reply = NULL;
+}
- if (server->timeout > 0)
- g_source_remove(server->timeout);
+static void destroy_server(struct server_data *server)
+{
+ debug("index %d server %s sock %d", server->index, server->server,
+ server->channel ?
+ g_io_channel_unix_get_fd(server->channel): -1);
- g_io_channel_unref(server->channel);
+ server_list = g_slist_remove(server_list, server);
+ server_destroy_socket(server);
- if (server->protocol == IPPROTO_UDP)
- connman_info("Removing DNS server %s", server->server);
+ if (server->protocol == IPPROTO_UDP && server->enabled)
+ debug("Removing DNS server %s", server->server);
- g_free(server->incoming_reply);
g_free(server->server);
- for (list = server->domains; list; list = list->next) {
- char *domain = list->data;
+ g_list_free_full(server->domains, g_free);
+ g_free(server->server_addr);
+
+ /*
+ * We do not remove cache right away but delay it few seconds.
+ * The idea is that when IPv6 DNS server is added via RDNSS, it has a
+ * lifetime. When the lifetime expires we decrease the refcount so it
+ * is possible that the cache is then removed. Because a new DNS server
+ * is usually created almost immediately we would then loose the cache
+ * without any good reason. The small delay allows the new RDNSS to
+ * create a new DNS server instance and the refcount does not go to 0.
+ */
+ if (cache && !cache_timer)
+ cache_timer = g_timeout_add_seconds(3, try_remove_cache, NULL);
- server->domains = g_list_remove(server->domains, domain);
- g_free(domain);
- }
- g_free(server->interface);
g_free(server);
}
gpointer user_data)
{
unsigned char buf[4096];
- int sk, err, len;
+ int sk, len;
+ struct server_data *data = user_data;
if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
- struct server_data *data = user_data;
-
connman_error("Error with UDP server %s", data->server);
- data->watch = 0;
+ server_destroy_socket(data);
return FALSE;
}
sk = g_io_channel_unix_get_fd(channel);
len = recv(sk, buf, sizeof(buf), 0);
- if (len < 12)
- return TRUE;
- err = forward_dns_reply(buf, len, IPPROTO_UDP);
- if (err < 0)
- return TRUE;
+ if (len >= 12)
+ forward_dns_reply(buf, len, IPPROTO_UDP, data);
+
+#if defined TIZEN_EXT
+ GSList *list;
+
+ for (list = server_list_sec; list; list = list->next) {
+ struct server_data *new_data = list->data;
+
+ if (new_data == data) {
+ destroy_server_sec(data);
+ return TRUE;
+ }
+ }
+#endif
return TRUE;
}
if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
GSList *list;
hangup:
- DBG("TCP server channel closed");
+ debug("TCP server channel closed, sk %d", sk);
/*
* Discard any partial response which is buffered; better
g_free(server->incoming_reply);
server->incoming_reply = NULL;
- for (list = request_list; list; list = list->next) {
+ list = request_list;
+ while (list) {
struct request_data *req = list->data;
struct domain_hdr *hdr;
+ list = list->next;
if (req->protocol == IPPROTO_UDP)
continue;
- if (req->request == NULL)
+ if (!req->request)
continue;
/*
if ((condition & G_IO_OUT) && !server->connected) {
GSList *list;
GList *domains;
+ bool no_request_sent = true;
struct server_data *udp_server;
- udp_server = find_server(server->interface, server->server,
+ udp_server = find_server(server->index, server->server,
IPPROTO_UDP);
- if (udp_server != NULL) {
+ if (udp_server) {
for (domains = udp_server->domains; domains;
domains = domains->next) {
char *dom = domains->data;
- DBG("Adding domain %s to %s",
+ debug("Adding domain %s to %s",
dom, server->server);
server->domains = g_list_append(server->domains,
}
}
- server->connected = TRUE;
+ server->connected = true;
server_list = g_slist_append(server_list, server);
if (server->timeout > 0) {
server->timeout = 0;
}
- for (list = request_list; list; list = list->next) {
+ for (list = request_list; list; ) {
struct request_data *req = list->data;
+ int status;
- if (req->protocol == IPPROTO_UDP)
+ if (req->protocol == IPPROTO_UDP) {
+ list = list->next;
+ continue;
+ }
+
+ debug("Sending req %s over TCP", (char *)req->name);
+
+ status = ns_resolv(server, req,
+ req->request, req->name);
+ if (status > 0) {
+ /*
+ * A cached result was sent,
+ * so the request can be released
+ */
+ list = list->next;
+ request_list = g_slist_remove(request_list, req);
+ destroy_request_data(req);
+ continue;
+ }
+
+ if (status < 0) {
+ list = list->next;
continue;
+ }
- DBG("Sending req %s over TCP", (char *)req->name);
+ no_request_sent = false;
if (req->timeout > 0)
g_source_remove(req->timeout);
req->timeout = g_timeout_add_seconds(30,
request_timeout, req);
- ns_resolv(server, req, req->request, req->name);
+ list = list->next;
+ }
+
+ if (no_request_sent) {
+ destroy_server(server);
+ return FALSE;
}
} else if (condition & G_IO_IN) {
reply_len = reply_len_buf[1] | reply_len_buf[0] << 8;
reply_len += 2;
- DBG("TCP reply %d bytes", reply_len);
+ debug("TCP reply %d bytes from %d", reply_len, sk);
reply = g_try_malloc(sizeof(*reply) + reply_len + 2);
if (!reply)
reply->received += bytes_recv;
}
- forward_dns_reply(reply->buf, reply->received, IPPROTO_TCP);
+ forward_dns_reply(reply->buf, reply->received, IPPROTO_TCP,
+ server);
g_free(reply);
server->incoming_reply = NULL;
{
struct server_data *server = user_data;
+ debug("");
+
+ if (!server)
+ return FALSE;
+
+ destroy_server(server);
+
+ return FALSE;
+}
+
+static int server_create_socket(struct server_data *data)
+{
+ int sk, err;
+ char *interface;
+
+ debug("index %d server %s proto %d", data->index,
+ data->server, data->protocol);
+
+ sk = socket(data->server_addr->sa_family,
+ data->protocol == IPPROTO_TCP ? SOCK_STREAM : SOCK_DGRAM,
+ data->protocol);
+ if (sk < 0) {
+ err = errno;
+ connman_error("Failed to create server %s socket",
+ data->server);
+ server_destroy_socket(data);
+ return -err;
+ }
+
+ debug("sk %d", sk);
+
+ interface = connman_inet_ifname(data->index);
+ if (interface) {
+ if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
+ interface,
+ strlen(interface) + 1) < 0) {
+ err = errno;
+ connman_error("Failed to bind server %s "
+ "to interface %s",
+ data->server, interface);
+ close(sk);
+ server_destroy_socket(data);
+ g_free(interface);
+ return -err;
+ }
+ g_free(interface);
+ }
+
+ data->channel = g_io_channel_unix_new(sk);
+ if (!data->channel) {
+ connman_error("Failed to create server %s channel",
+ data->server);
+ close(sk);
+ server_destroy_socket(data);
+ return -ENOMEM;
+ }
+
+ g_io_channel_set_close_on_unref(data->channel, TRUE);
+
+ if (data->protocol == IPPROTO_TCP) {
+ g_io_channel_set_flags(data->channel, G_IO_FLAG_NONBLOCK, NULL);
+ data->watch = g_io_add_watch(data->channel,
+ G_IO_OUT | G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
+ tcp_server_event, data);
+ data->timeout = g_timeout_add_seconds(30, tcp_idle_timeout,
+ data);
+ } else
+ data->watch = g_io_add_watch(data->channel,
+ G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
+ udp_server_event, data);
+
+ if (connect(sk, data->server_addr, data->server_addr_len) < 0) {
+ err = errno;
+
+ if ((data->protocol == IPPROTO_TCP && errno != EINPROGRESS) ||
+ data->protocol == IPPROTO_UDP) {
+
+ connman_error("Failed to connect to server %s",
+ data->server);
+ server_destroy_socket(data);
+ return -err;
+ }
+ }
+
+ create_cache();
+
+ return 0;
+}
+
+static void enable_fallback(bool enable)
+{
+ GSList *list;
+
+ for (list = server_list; list; list = list->next) {
+ struct server_data *data = list->data;
+
+ if (data->index != -1)
+ continue;
+
+ if (enable)
+ DBG("Enabling fallback DNS server %s", data->server);
+ else
+ DBG("Disabling fallback DNS server %s", data->server);
+
+ data->enabled = enable;
+ }
+}
+
+#if defined TIZEN_EXT
+
+static void destroy_server_sec(struct server_data *server)
+{
+ GList *list;
+ int fd;
+
+ if (server->channel)
+ fd = g_io_channel_unix_get_fd(server->channel);
+ else
+ fd = -1;
+
+ DBG("index %d server %s sock %d", server->index, server->server, fd);
+
+ server_list_sec = g_slist_remove(server_list_sec, server);
+
+ if (fd > 0)
+ close(fd);
+
+ server_destroy_socket(server);
+
+ if (server->protocol == IPPROTO_UDP && server->enabled)
+ DBG("Removing DNS server %s", server->server);
+
+ g_free(server->server);
+ for (list = server->domains; list; list = list->next) {
+ char *domain = list->data;
+
+ server->domains = g_list_remove(server->domains, domain);
+ g_free(domain);
+ }
+ g_free(server->server_addr);
+
+ /*
+ * We do not remove cache right away but delay it few seconds.
+ * The idea is that when IPv6 DNS server is added via RDNSS, it has a
+ * lifetime. When the lifetime expires we decrease the refcount so it
+ * is possible that the cache is then removed. Because a new DNS server
+ * is usually created almost immediately we would then loose the cache
+ * without any good reason. The small delay allows the new RDNSS to
+ * create a new DNS server instance and the refcount does not go to 0.
+ */
+ /* TODO: Need to check this */
+ /* g_timeout_add_seconds(3, try_remove_cache, NULL); */
+
+ g_free(server);
+}
+
+static void destroy_all_server_sec()
+{
+ GSList *list;
+
+ DBG("remove all dns server");
+
+ for (list = server_list_sec; list; list = list->next) {
+ struct server_data *server = list->data;
+ destroy_server_sec(server);
+ }
+ server_list_sec = NULL;
+}
+
+static gboolean sec_udp_idle_timeout(gpointer user_data)
+{
+ struct server_data *server = user_data;
+
DBG("");
if (server == NULL)
return FALSE;
- destroy_server(server);
+ destroy_server_sec(server);
return FALSE;
}
-static struct server_data *create_server(const char *interface,
+static struct server_data *create_server_sec(int index,
const char *domain, const char *server,
int protocol)
{
- struct addrinfo hints, *rp;
struct server_data *data;
- int sk, ret;
+ struct addrinfo hints, *rp;
+ int ret;
+
+ DBG("index %d server %s", index, server);
+
+ data = g_try_new0(struct server_data, 1);
+ if (data == NULL) {
+ connman_error("Failed to allocate server %s data", server);
+ return NULL;
+ }
- DBG("interface %s server %s", interface, server);
+ data->index = index;
+ if (domain)
+ data->domains = g_list_append(data->domains, g_strdup(domain));
+ data->server = g_strdup(server);
+ data->protocol = protocol;
memset(&hints, 0, sizeof(hints));
break;
default:
+ destroy_server_sec(data);
return NULL;
}
hints.ai_family = AF_UNSPEC;
- hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV | AI_NUMERICHOST;
+ hints.ai_flags = AI_NUMERICSERV | AI_NUMERICHOST;
- ret = getaddrinfo(server, "53", &hints, &rp);
+ ret = getaddrinfo(data->server, "53", &hints, &rp);
if (ret) {
connman_error("Failed to parse server %s address: %s\n",
- server, gai_strerror(ret));
+ data->server, gai_strerror(ret));
+ freeaddrinfo(rp);
+ destroy_server_sec(data);
return NULL;
}
+
/* Do not blindly copy this code elsewhere; it doesn't loop over the
results using ->ai_next as it should. That's OK in *this* case
because it was a numeric lookup; we *know* there's only one. */
- sk = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
- if (sk < 0) {
- connman_error("Failed to create server %s socket", server);
+ data->server_addr_len = rp->ai_addrlen;
+
+ switch (rp->ai_family) {
+ case AF_INET:
+ data->server_addr = (struct sockaddr *)
+ g_try_new0(struct sockaddr_in, 1);
+ break;
+ case AF_INET6:
+ data->server_addr = (struct sockaddr *)
+ g_try_new0(struct sockaddr_in6, 1);
+ break;
+ default:
+ connman_error("Wrong address family %d", rp->ai_family);
+ break;
+ }
+ if (data->server_addr == NULL) {
freeaddrinfo(rp);
+ destroy_server_sec(data);
return NULL;
}
+ memcpy(data->server_addr, rp->ai_addr, rp->ai_addrlen);
+ freeaddrinfo(rp);
- if (interface != NULL) {
- if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
- interface, strlen(interface) + 1) < 0) {
- connman_error("Failed to bind server %s "
- "to interface %s",
- server, interface);
- freeaddrinfo(rp);
- close(sk);
- return NULL;
- }
+ if (server_create_socket(data) != 0) {
+ destroy_server_sec(data);
+ return NULL;
+ }
+
+ if (protocol == IPPROTO_UDP) {
+ /* Enable new servers by default */
+ data->enabled = TRUE;
+ DBG("Adding DNS server %s", data->server);
+
+ data->timeout = g_timeout_add_seconds(30, sec_udp_idle_timeout,
+ data);
+
+ server_list_sec = g_slist_append(server_list_sec, data);
}
+ return data;
+}
+#endif
+
+static struct server_data *create_server(int index,
+ const char *domain, const char *server,
+ int protocol)
+{
+ struct server_data *data;
+ struct addrinfo hints, *rp;
+ int ret;
+
+ DBG("index %d server %s", index, server);
+
data = g_try_new0(struct server_data, 1);
- if (data == NULL) {
+ if (!data) {
connman_error("Failed to allocate server %s data", server);
- freeaddrinfo(rp);
- close(sk);
return NULL;
}
- data->channel = g_io_channel_unix_new(sk);
- if (data->channel == NULL) {
- connman_error("Failed to create server %s channel", server);
- freeaddrinfo(rp);
- close(sk);
- g_free(data);
+ data->index = index;
+ if (domain)
+ data->domains = g_list_append(data->domains, g_strdup(domain));
+ data->server = g_strdup(server);
+ data->protocol = protocol;
+
+ memset(&hints, 0, sizeof(hints));
+
+ switch (protocol) {
+ case IPPROTO_UDP:
+ hints.ai_socktype = SOCK_DGRAM;
+ break;
+
+ case IPPROTO_TCP:
+ hints.ai_socktype = SOCK_STREAM;
+ break;
+
+ default:
+ destroy_server(data);
+ return NULL;
+ }
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_flags = AI_NUMERICSERV | AI_NUMERICHOST;
+
+ ret = getaddrinfo(data->server, "53", &hints, &rp);
+ if (ret) {
+ connman_error("Failed to parse server %s address: %s\n",
+ data->server, gai_strerror(ret));
+ destroy_server(data);
return NULL;
}
- g_io_channel_set_close_on_unref(data->channel, TRUE);
-
- if (protocol == IPPROTO_TCP) {
- g_io_channel_set_flags(data->channel, G_IO_FLAG_NONBLOCK, NULL);
- data->watch = g_io_add_watch(data->channel,
- G_IO_OUT | G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
- tcp_server_event, data);
- data->timeout = g_timeout_add_seconds(30, tcp_idle_timeout,
- data);
- } else
- data->watch = g_io_add_watch(data->channel,
- G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
- udp_server_event, data);
+ /* Do not blindly copy this code elsewhere; it doesn't loop over the
+ results using ->ai_next as it should. That's OK in *this* case
+ because it was a numeric lookup; we *know* there's only one. */
- data->interface = g_strdup(interface);
- if (domain)
- data->domains = g_list_append(data->domains, g_strdup(domain));
- data->server = g_strdup(server);
- data->protocol = protocol;
+ data->server_addr_len = rp->ai_addrlen;
- ret = connect(sk, rp->ai_addr, rp->ai_addrlen);
+ switch (rp->ai_family) {
+ case AF_INET:
+ data->server_addr = (struct sockaddr *)
+ g_try_new0(struct sockaddr_in, 1);
+ break;
+ case AF_INET6:
+ data->server_addr = (struct sockaddr *)
+ g_try_new0(struct sockaddr_in6, 1);
+ break;
+ default:
+ connman_error("Wrong address family %d", rp->ai_family);
+ break;
+ }
+ if (!data->server_addr) {
+ freeaddrinfo(rp);
+ destroy_server(data);
+ return NULL;
+ }
+ memcpy(data->server_addr, rp->ai_addr, rp->ai_addrlen);
freeaddrinfo(rp);
- if (ret < 0) {
- if ((protocol == IPPROTO_TCP && errno != EINPROGRESS) ||
- protocol == IPPROTO_UDP) {
- GList *list;
-
- connman_error("Failed to connect to server %s", server);
- if (data->watch > 0)
- g_source_remove(data->watch);
- if (data->timeout > 0)
- g_source_remove(data->timeout);
-
- g_io_channel_unref(data->channel);
- close(sk);
- g_free(data->server);
- g_free(data->interface);
- for (list = data->domains; list; list = list->next) {
- char *domain = list->data;
-
- data->domains = g_list_remove(data->domains,
- domain);
- g_free(domain);
- }
- g_free(data);
- return NULL;
- }
+ if (server_create_socket(data) != 0) {
+ destroy_server(data);
+ return NULL;
}
if (protocol == IPPROTO_UDP) {
- /* Enable new servers by default */
- data->enabled = TRUE;
- connman_info("Adding DNS server %s", data->server);
+ if (__connman_service_index_is_default(data->index) ||
+ __connman_service_index_is_split_routing(
+ data->index)) {
+ data->enabled = true;
+ DBG("Adding DNS server %s", data->server);
- server_list = g_slist_append(server_list, data);
+ enable_fallback(false);
+ }
- return data;
+ server_list = g_slist_append(server_list, data);
}
- return NULL;
+ return data;
}
-static gboolean resolv(struct request_data *req,
+static bool resolv(struct request_data *req,
gpointer request, gpointer name)
{
GSList *list;
for (list = server_list; list; list = list->next) {
struct server_data *data = list->data;
- DBG("server %s enabled %d", data->server, data->enabled);
-
- if (data->enabled == FALSE)
+ if (data->protocol == IPPROTO_TCP) {
+ DBG("server %s ignored proto TCP", data->server);
continue;
+ }
- if (data->watch == 0 && data->protocol == IPPROTO_UDP)
- data->watch = g_io_add_watch(data->channel,
- G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
- udp_server_event, data);
+ debug("server %s enabled %d", data->server, data->enabled);
- if (ns_resolv(data, req, request, name) < 0)
+ if (!data->enabled)
continue;
+
+ if (!data->channel && data->protocol == IPPROTO_UDP) {
+ if (server_create_socket(data) < 0) {
+ DBG("socket creation failed while resolving");
+ continue;
+ }
+ }
+
+ if (ns_resolv(data, req, request, name) > 0)
+ return true;
}
- return TRUE;
+ return false;
}
-static void append_domain(const char *interface, const char *domain)
+static void update_domain(int index, const char *domain, bool append)
{
GSList *list;
- DBG("interface %s domain %s", interface, domain);
+ DBG("index %d domain %s", index, domain);
- if (domain == NULL)
+ if (!domain)
return;
for (list = server_list; list; list = list->next) {
struct server_data *data = list->data;
GList *dom_list;
char *dom;
- gboolean dom_found = FALSE;
+ bool dom_found = false;
- if (data->interface == NULL)
+ if (data->index < 0)
continue;
- if (g_str_equal(data->interface, interface) == FALSE)
+ if (data->index != index)
continue;
for (dom_list = data->domains; dom_list;
dom = dom_list->data;
if (g_str_equal(dom, domain)) {
- dom_found = TRUE;
+ dom_found = true;
break;
}
}
- if (dom_found == FALSE) {
+ if (!dom_found && append) {
data->domains =
g_list_append(data->domains, g_strdup(domain));
+ } else if (dom_found && !append) {
+ data->domains =
+ g_list_remove(data->domains, dom);
+ g_free(dom);
+ }
+ }
+}
+
+static void append_domain(int index, const char *domain)
+{
+ update_domain(index, domain, true);
+}
+
+static void remove_domain(int index, const char *domain)
+{
+ update_domain(index, domain, false);
+}
+
+static void flush_requests(struct server_data *server)
+{
+ GSList *list;
+
+ list = request_list;
+ while (list) {
+ struct request_data *req = list->data;
+
+ list = list->next;
+
+ if (ns_resolv(server, req, req->request, req->name)) {
+ /*
+ * A cached result was sent,
+ * so the request can be released
+ */
+ request_list =
+ g_slist_remove(request_list, req);
+ destroy_request_data(req);
+ continue;
}
+
+ if (req->timeout > 0)
+ g_source_remove(req->timeout);
+
+ req->timeout = g_timeout_add_seconds(5, request_timeout, req);
}
}
-int __connman_dnsproxy_append(const char *interface, const char *domain,
+int __connman_dnsproxy_append(int index, const char *domain,
const char *server)
{
struct server_data *data;
- DBG("interface %s server %s", interface, server);
+ DBG("index %d server %s", index, server);
- if (server == NULL && domain == NULL)
+ if (!server && !domain)
return -EINVAL;
- if (server == NULL) {
- append_domain(interface, domain);
+ if (!server) {
+ append_domain(index, domain);
return 0;
}
- if (g_str_equal(server, "127.0.0.1") == TRUE)
+ if (g_str_equal(server, "127.0.0.1"))
return -ENODEV;
- data = find_server(interface, server, IPPROTO_UDP);
- if (data != NULL) {
- append_domain(interface, domain);
+ if (g_str_equal(server, "::1"))
+ return -ENODEV;
+
+ data = find_server(index, server, IPPROTO_UDP);
+ if (data) {
+ append_domain(index, domain);
return 0;
}
- data = create_server(interface, domain, server, IPPROTO_UDP);
- if (data == NULL)
+ data = create_server(index, domain, server, IPPROTO_UDP);
+ if (!data)
return -EIO;
+ flush_requests(data);
+
return 0;
}
-static void remove_server(const char *interface, const char *domain,
+static void remove_server(int index, const char *domain,
const char *server, int protocol)
{
struct server_data *data;
+ GSList *list;
- data = find_server(interface, server, protocol);
- if (data == NULL)
+ data = find_server(index, server, protocol);
+ if (!data)
return;
destroy_server(data);
+
+ for (list = server_list; list; list = list->next) {
+ struct server_data *data = list->data;
+
+ if (data->index != -1 && data->enabled == true)
+ return;
+ }
+
+ enable_fallback(true);
}
-int __connman_dnsproxy_remove(const char *interface, const char *domain,
+int __connman_dnsproxy_remove(int index, const char *domain,
const char *server)
{
- DBG("interface %s server %s", interface, server);
+ DBG("index %d server %s", index, server);
- if (server == NULL)
+ if (!server && !domain)
return -EINVAL;
- if (g_str_equal(server, "127.0.0.1") == TRUE)
- return -ENODEV;
+ if (!server) {
+ remove_domain(index, domain);
- remove_server(interface, domain, server, IPPROTO_UDP);
- remove_server(interface, domain, server, IPPROTO_TCP);
+ return 0;
+ }
- return 0;
-}
+ if (g_str_equal(server, "127.0.0.1"))
+ return -ENODEV;
-void __connman_dnsproxy_flush(void)
-{
- GSList *list;
+ if (g_str_equal(server, "::1"))
+ return -ENODEV;
- list = request_pending_list;
- while (list) {
- struct request_data *req = list->data;
+ remove_server(index, domain, server, IPPROTO_UDP);
+ remove_server(index, domain, server, IPPROTO_TCP);
- list = list->next;
+#if defined TIZEN_EXT
+ destroy_all_server_sec();
+#endif
- request_pending_list =
- g_slist_remove(request_pending_list, req);
- resolv(req, req->request, req->name);
- g_free(req->request);
- g_free(req->name);
- }
+ return 0;
}
-static void dnsproxy_offline_mode(connman_bool_t enabled)
+static void dnsproxy_offline_mode(bool enabled)
{
GSList *list;
for (list = server_list; list; list = list->next) {
struct server_data *data = list->data;
- if (enabled == FALSE) {
- connman_info("Enabling DNS server %s", data->server);
- data->enabled = TRUE;
+ if (!enabled) {
+ DBG("Enabling DNS server %s", data->server);
+ data->enabled = true;
+ cache_invalidate();
+ cache_refresh();
} else {
- connman_info("Disabling DNS server %s", data->server);
- data->enabled = FALSE;
+ DBG("Disabling DNS server %s", data->server);
+ data->enabled = false;
+ cache_invalidate();
}
}
}
static void dnsproxy_default_changed(struct connman_service *service)
{
+ bool server_enabled = false;
GSList *list;
- char *interface;
+ int index;
DBG("service %p", service);
- if (service == NULL) {
+ /* DNS has changed, invalidate the cache */
+ cache_invalidate();
+
+ if (!service) {
/* When no services are active, then disable DNS proxying */
- dnsproxy_offline_mode(TRUE);
+ dnsproxy_offline_mode(true);
return;
}
- interface = connman_service_get_interface(service);
- if (interface == NULL)
+ index = __connman_service_get_index(service);
+ if (index < 0)
return;
for (list = server_list; list; list = list->next) {
struct server_data *data = list->data;
- if (g_strcmp0(data->interface, interface) == 0) {
- connman_info("Enabling DNS server %s", data->server);
- data->enabled = TRUE;
+ if (data->index == index) {
+ DBG("Enabling DNS server %s", data->server);
+ data->enabled = true;
+ server_enabled = true;
} else {
- connman_info("Disabling DNS server %s", data->server);
- data->enabled = FALSE;
+ DBG("Disabling DNS server %s", data->server);
+ data->enabled = false;
}
}
- g_free(interface);
+ if (!server_enabled)
+ enable_fallback(true);
+
+ cache_refresh();
+}
+
+static void dnsproxy_service_state_changed(struct connman_service *service,
+ enum connman_service_state state)
+{
+ GSList *list;
+ int index;
+
+ switch (state) {
+ case CONNMAN_SERVICE_STATE_DISCONNECT:
+ case CONNMAN_SERVICE_STATE_IDLE:
+ break;
+ case CONNMAN_SERVICE_STATE_ASSOCIATION:
+ case CONNMAN_SERVICE_STATE_CONFIGURATION:
+ case CONNMAN_SERVICE_STATE_FAILURE:
+ case CONNMAN_SERVICE_STATE_ONLINE:
+ case CONNMAN_SERVICE_STATE_READY:
+ case CONNMAN_SERVICE_STATE_UNKNOWN:
+ return;
+ }
+
+ index = __connman_service_get_index(service);
+ list = server_list;
+
+ while (list) {
+ struct server_data *data = list->data;
+
+ /* Get next before the list is changed by destroy_server() */
+ list = list->next;
+
+ if (data->index == index) {
+ DBG("removing server data of index %d", index);
+ destroy_server(data);
+ }
+ }
}
-static struct connman_notifier dnsproxy_notifier = {
+static const struct connman_notifier dnsproxy_notifier = {
.name = "dnsproxy",
.default_changed = dnsproxy_default_changed,
.offline_mode = dnsproxy_offline_mode,
+ .service_state_changed = dnsproxy_service_state_changed,
};
-static unsigned char opt_edns0_type[2] = { 0x00, 0x29 };
+static const unsigned char opt_edns0_type[2] = { 0x00, 0x29 };
-static int parse_request(unsigned char *buf, int len,
+static int parse_request(unsigned char *buf, size_t len,
char *name, unsigned int size)
{
struct domain_hdr *hdr = (void *) buf;
uint16_t qdcount = ntohs(hdr->qdcount);
+ uint16_t ancount = ntohs(hdr->ancount);
+ uint16_t nscount = ntohs(hdr->nscount);
uint16_t arcount = ntohs(hdr->arcount);
unsigned char *ptr;
- char *last_label = NULL;
unsigned int remain, used = 0;
- if (len < 12)
+ if (len < sizeof(*hdr) + sizeof(struct qtype_qclass) ||
+ hdr->qr || qdcount != 1 || ancount || nscount) {
+ DBG("Dropped DNS request qr %d with len %zd qdcount %d "
+ "ancount %d nscount %d", hdr->qr, len, qdcount, ancount,
+ nscount);
+
+ return -EINVAL;
+ }
+
+ if (!name || !size)
return -EINVAL;
- DBG("id 0x%04x qr %d opcode %d qdcount %d arcount %d",
+ debug("id 0x%04x qr %d opcode %d qdcount %d arcount %d",
hdr->id, hdr->qr, hdr->opcode,
qdcount, arcount);
- if (hdr->qr != 0 || qdcount != 1)
- return -EINVAL;
-
- memset(name, 0, size);
+ name[0] = '\0';
ptr = buf + sizeof(struct domain_hdr);
remain = len - sizeof(struct domain_hdr);
while (remain > 0) {
- uint8_t len = *ptr;
+ uint8_t label_len = *ptr;
+
+ if (label_len == 0x00) {
+ uint8_t class;
+ struct qtype_qclass *q =
+ (struct qtype_qclass *)(ptr + 1);
+
+ if (remain < sizeof(*q)) {
+ DBG("Dropped malformed DNS query");
+ return -EINVAL;
+ }
+
+ class = ntohs(q->qclass);
+ if (class != 1 && class != 255) {
+ DBG("Dropped non-IN DNS class %d", class);
+ return -EINVAL;
+ }
- if (len == 0x00) {
- last_label = (char *) (ptr + 1);
+ ptr += sizeof(*q) + 1;
+ remain -= (sizeof(*q) + 1);
break;
}
- if (used + len + 1 > size)
- return -ENOBUFS;
+ if (used + label_len + 1 > size)
+ return -ENOBUFS;
+
+ strncat(name, (char *) (ptr + 1), label_len);
+ strcat(name, ".");
+
+ used += label_len + 1;
+
+ ptr += label_len + 1;
+ remain -= label_len + 1;
+ }
+
+ if (arcount && remain >= sizeof(struct domain_rr) + 1 && !ptr[0] &&
+ ptr[1] == opt_edns0_type[0] && ptr[2] == opt_edns0_type[1]) {
+ struct domain_rr *edns0 = (struct domain_rr *)(ptr + 1);
+
+ DBG("EDNS0 buffer size %u", ntohs(edns0->class));
+ } else if (!arcount && remain) {
+ DBG("DNS request with %d garbage bytes", remain);
+ }
+
+ debug("query %s", name);
+
+ return 0;
+}
+
+static void client_reset(struct tcp_partial_client_data *client)
+{
+ if (!client)
+ return;
+
+ if (client->channel) {
+ debug("client %d closing",
+ g_io_channel_unix_get_fd(client->channel));
+
+ g_io_channel_unref(client->channel);
+ client->channel = NULL;
+ }
+
+ if (client->watch > 0) {
+ g_source_remove(client->watch);
+ client->watch = 0;
+ }
+
+ if (client->timeout > 0) {
+ g_source_remove(client->timeout);
+ client->timeout = 0;
+ }
+
+ g_free(client->buf);
+ client->buf = NULL;
+
+ client->buf_end = 0;
+}
+
+static unsigned int get_msg_len(unsigned char *buf)
+{
+ return buf[0]<<8 | buf[1];
+}
+
+static bool read_tcp_data(struct tcp_partial_client_data *client,
+ void *client_addr, socklen_t client_addr_len,
+ int read_len)
+{
+ char query[TCP_MAX_BUF_LEN];
+ struct request_data *req;
+ int client_sk, err;
+ unsigned int msg_len;
+ GSList *list;
+ bool waiting_for_connect = false;
+ int qtype = 0;
+ struct cache_entry *entry;
+
+ client_sk = g_io_channel_unix_get_fd(client->channel);
+
+ if (read_len == 0) {
+ debug("client %d closed, pending %d bytes",
+ client_sk, client->buf_end);
+ g_hash_table_remove(partial_tcp_req_table,
+ GINT_TO_POINTER(client_sk));
+ return false;
+ }
+
+ debug("client %d received %d bytes", client_sk, read_len);
+
+ client->buf_end += read_len;
+
+ if (client->buf_end < 2)
+ return true;
+
+ msg_len = get_msg_len(client->buf);
+ if (msg_len > TCP_MAX_BUF_LEN) {
+ debug("client %d sent too much data %d", client_sk, msg_len);
+ g_hash_table_remove(partial_tcp_req_table,
+ GINT_TO_POINTER(client_sk));
+ return false;
+ }
+
+read_another:
+ debug("client %d msg len %d end %d past end %d", client_sk, msg_len,
+ client->buf_end, client->buf_end - (msg_len + 2));
+
+ if (client->buf_end < (msg_len + 2)) {
+ debug("client %d still missing %d bytes",
+ client_sk,
+ msg_len + 2 - client->buf_end);
+ return true;
+ }
+
+ debug("client %d all data %d received", client_sk, msg_len);
+
+ err = parse_request(client->buf + 2, msg_len,
+ query, sizeof(query));
+ if (err < 0 || (g_slist_length(server_list) == 0)) {
+ send_response(client_sk, client->buf, msg_len + 2,
+ NULL, 0, IPPROTO_TCP);
+ return true;
+ }
+
+ req = g_try_new0(struct request_data, 1);
+ if (!req)
+ return true;
+
+ memcpy(&req->sa, client_addr, client_addr_len);
+ req->sa_len = client_addr_len;
+ req->client_sk = client_sk;
+ req->protocol = IPPROTO_TCP;
+ req->family = client->family;
+
+ req->srcid = client->buf[2] | (client->buf[3] << 8);
+ req->dstid = get_id();
+ req->altid = get_id();
+ req->request_len = msg_len + 2;
+
+ client->buf[2] = req->dstid & 0xff;
+ client->buf[3] = req->dstid >> 8;
+
+ req->numserv = 0;
+ req->ifdata = client->ifdata;
+ req->append_domain = false;
+
+ /*
+ * Check if the answer is found in the cache before
+ * creating sockets to the server.
+ */
+ entry = cache_check(client->buf, &qtype, IPPROTO_TCP);
+ if (entry) {
+ int ttl_left = 0;
+ struct cache_data *data;
+
+ debug("cache hit %s type %s", query, qtype == 1 ? "A" : "AAAA");
+ if (qtype == 1)
+ data = entry->ipv4;
+ else
+ data = entry->ipv6;
+
+ if (data) {
+ ttl_left = data->valid_until - time(NULL);
+ entry->hits++;
+
+ send_cached_response(client_sk, data->data,
+ data->data_len, NULL, 0, IPPROTO_TCP,
+ req->srcid, data->answers, ttl_left);
+
+ g_free(req);
+ goto out;
+ } else
+ debug("data missing, ignoring cache for this query");
+ }
+
+ for (list = server_list; list; list = list->next) {
+ struct server_data *data = list->data;
+
+ if (data->protocol != IPPROTO_UDP || !data->enabled)
+ continue;
+
+ if (!create_server(data->index, NULL, data->server,
+ IPPROTO_TCP))
+ continue;
+
+ waiting_for_connect = true;
+ }
+
+ if (!waiting_for_connect) {
+ /* No server is waiting for connect */
+ send_response(client_sk, client->buf,
+ req->request_len, NULL, 0, IPPROTO_TCP);
+ g_free(req);
+ return true;
+ }
+
+ /*
+ * The server is not connected yet.
+ * Copy the relevant buffers.
+ * The request will actually be sent once we're
+ * properly connected over TCP to the nameserver.
+ */
+ req->request = g_try_malloc0(req->request_len);
+ if (!req->request) {
+ send_response(client_sk, client->buf,
+ req->request_len, NULL, 0, IPPROTO_TCP);
+ g_free(req);
+ goto out;
+ }
+ memcpy(req->request, client->buf, req->request_len);
+
+ req->name = g_try_malloc0(sizeof(query));
+ if (!req->name) {
+ send_response(client_sk, client->buf,
+ req->request_len, NULL, 0, IPPROTO_TCP);
+ g_free(req->request);
+ g_free(req);
+ goto out;
+ }
+ memcpy(req->name, query, sizeof(query));
+
+ req->timeout = g_timeout_add_seconds(30, request_timeout, req);
+
+ request_list = g_slist_append(request_list, req);
+
+out:
+ if (client->buf_end > (msg_len + 2)) {
+ debug("client %d buf %p -> %p end %d len %d new %d",
+ client_sk,
+ client->buf + msg_len + 2,
+ client->buf, client->buf_end,
+ TCP_MAX_BUF_LEN - client->buf_end,
+ client->buf_end - (msg_len + 2));
+ memmove(client->buf, client->buf + msg_len + 2,
+ TCP_MAX_BUF_LEN - client->buf_end);
+ client->buf_end = client->buf_end - (msg_len + 2);
+
+ /*
+ * If we have a full message waiting, just read it
+ * immediately.
+ */
+ msg_len = get_msg_len(client->buf);
+ if ((msg_len + 2) == client->buf_end) {
+ debug("client %d reading another %d bytes", client_sk,
+ msg_len + 2);
+ goto read_another;
+ }
+ } else {
+ debug("client %d clearing reading buffer", client_sk);
+
+ client->buf_end = 0;
+ memset(client->buf, 0, TCP_MAX_BUF_LEN);
+
+ /*
+ * We received all the packets from client so we must also
+ * remove the timeout handler here otherwise we might get
+ * timeout while waiting the results from server.
+ */
+ g_source_remove(client->timeout);
+ client->timeout = 0;
+ }
+
+ return true;
+}
+
+static gboolean tcp_client_event(GIOChannel *channel, GIOCondition condition,
+ gpointer user_data)
+{
+ struct tcp_partial_client_data *client = user_data;
+ struct sockaddr_in6 client_addr6;
+ socklen_t client_addr6_len = sizeof(client_addr6);
+ struct sockaddr_in client_addr4;
+ socklen_t client_addr4_len = sizeof(client_addr4);
+ void *client_addr;
+ socklen_t *client_addr_len;
+ int len, client_sk;
+
+ client_sk = g_io_channel_unix_get_fd(channel);
+
+ if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
+ g_hash_table_remove(partial_tcp_req_table,
+ GINT_TO_POINTER(client_sk));
+
+ connman_error("Error with TCP client %d channel", client_sk);
+ return FALSE;
+ }
+
+ switch (client->family) {
+ case AF_INET:
+ client_addr = &client_addr4;
+ client_addr_len = &client_addr4_len;
+ break;
+ case AF_INET6:
+ client_addr = &client_addr6;
+ client_addr_len = &client_addr6_len;
+ break;
+ default:
+ g_hash_table_remove(partial_tcp_req_table,
+ GINT_TO_POINTER(client_sk));
+ connman_error("client %p corrupted", client);
+ return FALSE;
+ }
+
+ len = recvfrom(client_sk, client->buf + client->buf_end,
+ TCP_MAX_BUF_LEN - client->buf_end, 0,
+ client_addr, client_addr_len);
+ if (len < 0) {
+ if (errno == EAGAIN || errno == EWOULDBLOCK)
+ return TRUE;
+
+ debug("client %d cannot read errno %d/%s", client_sk, -errno,
+ strerror(errno));
+ g_hash_table_remove(partial_tcp_req_table,
+ GINT_TO_POINTER(client_sk));
+ return FALSE;
+ }
+
+ return read_tcp_data(client, client_addr, *client_addr_len, len);
+}
+
+static gboolean client_timeout(gpointer user_data)
+{
+ struct tcp_partial_client_data *client = user_data;
+ int sock;
- strncat(name, (char *) (ptr + 1), len);
- strcat(name, ".");
+ sock = g_io_channel_unix_get_fd(client->channel);
- used += len + 1;
+ debug("client %d timeout pending %d bytes", sock, client->buf_end);
- ptr += len + 1;
- remain -= len + 1;
- }
+ g_hash_table_remove(partial_tcp_req_table, GINT_TO_POINTER(sock));
- if (last_label && arcount && remain >= 9 && last_label[4] == 0 &&
- !memcmp(last_label + 5, opt_edns0_type, 2)) {
- uint16_t edns0_bufsize;
+ return FALSE;
+}
- edns0_bufsize = last_label[7] << 8 | last_label[8];
+#if defined TIZEN_EXT
+static void recover_listener(GIOChannel *channel, struct listener_data *ifdata)
+{
+ int sk, index;
- DBG("EDNS0 buffer size %u", edns0_bufsize);
+ index = ifdata->index;
- /* This is an evil hack until full TCP support has been
- * implemented.
- *
- * Somtimes the EDNS0 request gets send with a too-small
- * buffer size. Since glibc doesn't seem to crash when it
- * gets a response biffer then it requested, just bump
- * the buffer size up to 4KiB.
- */
- if (edns0_bufsize < 0x1000) {
- last_label[7] = 0x10;
- last_label[8] = 0x00;
- }
- }
+ sk = g_io_channel_unix_get_fd(channel);
+ close(sk);
- DBG("query %s", name);
+ __connman_dnsproxy_remove_listener(index);
- return 0;
+ if (__connman_dnsproxy_add_listener(index) == 0)
+ DBG("listener %d successfully recovered", index);
}
+#endif
-static gboolean tcp_listener_event(GIOChannel *channel, GIOCondition condition,
- gpointer user_data)
+static bool tcp_listener_event(GIOChannel *channel, GIOCondition condition,
+ struct listener_data *ifdata, int family,
+ guint *listener_watch)
{
- unsigned char buf[768];
- char query[512];
- struct request_data *req;
- struct server_data *server;
- int sk, client_sk, len, err;
- struct sockaddr_in6 client_addr;
- socklen_t client_addr_len = sizeof(client_addr);
- GSList *list;
- struct listener_data *ifdata = user_data;
-
- DBG("condition 0x%x", condition);
+ int sk, client_sk, len;
+ unsigned int msg_len;
+ struct tcp_partial_client_data *client;
+ struct sockaddr_in6 client_addr6;
+ socklen_t client_addr6_len = sizeof(client_addr6);
+ struct sockaddr_in client_addr4;
+ socklen_t client_addr4_len = sizeof(client_addr4);
+ void *client_addr;
+ socklen_t *client_addr_len;
+ struct timeval tv;
+ fd_set readfds;
+
+ debug("condition 0x%02x channel %p ifdata %p family %d",
+ condition, channel, ifdata, family);
if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
- if (ifdata->tcp_listener_watch > 0)
- g_source_remove(ifdata->tcp_listener_watch);
- ifdata->tcp_listener_watch = 0;
+#if defined TIZEN_EXT
+ connman_error("Error %d with TCP listener channel", condition);
+
+ recover_listener(channel, ifdata);
+#else
+ if (*listener_watch > 0)
+ g_source_remove(*listener_watch);
+ *listener_watch = 0;
connman_error("Error with TCP listener channel");
+#endif
- return FALSE;
+ return false;
}
sk = g_io_channel_unix_get_fd(channel);
- client_sk = accept(sk, (void *)&client_addr, &client_addr_len);
+ if (family == AF_INET) {
+ client_addr = &client_addr4;
+ client_addr_len = &client_addr4_len;
+ } else {
+ client_addr = &client_addr6;
+ client_addr_len = &client_addr6_len;
+ }
+
+ tv.tv_sec = tv.tv_usec = 0;
+ FD_ZERO(&readfds);
+ FD_SET(sk, &readfds);
+
+ select(sk + 1, &readfds, NULL, NULL, &tv);
+ if (FD_ISSET(sk, &readfds)) {
+ client_sk = accept(sk, client_addr, client_addr_len);
+ debug("client %d accepted", client_sk);
+ } else {
+ debug("No data to read from master %d, waiting.", sk);
+ return true;
+ }
+
if (client_sk < 0) {
connman_error("Accept failure on TCP listener");
- ifdata->tcp_listener_watch = 0;
- return FALSE;
+ *listener_watch = 0;
+ return false;
}
- len = recv(client_sk, buf, sizeof(buf), 0);
- if (len < 2)
- return TRUE;
+ fcntl(client_sk, F_SETFL, O_NONBLOCK);
- DBG("Received %d bytes (id 0x%04x)", len, buf[2] | buf[3] << 8);
+ client = g_hash_table_lookup(partial_tcp_req_table,
+ GINT_TO_POINTER(client_sk));
+ if (!client) {
+ client = g_try_new0(struct tcp_partial_client_data, 1);
+ if (!client) {
+ close(client_sk);
+ return false;
+ }
- err = parse_request(buf + 2, len - 2, query, sizeof(query));
- if (err < 0 || (g_slist_length(server_list) == 0)) {
- send_response(client_sk, buf, len, NULL, 0, IPPROTO_TCP);
- return TRUE;
- }
+ g_hash_table_insert(partial_tcp_req_table,
+ GINT_TO_POINTER(client_sk),
+ client);
- req = g_try_new0(struct request_data, 1);
- if (req == NULL)
- return TRUE;
+ client->channel = g_io_channel_unix_new(client_sk);
+ g_io_channel_set_close_on_unref(client->channel, TRUE);
- memcpy(&req->sa, &client_addr, client_addr_len);
- req->sa_len = client_addr_len;
- req->client_sk = client_sk;
- req->protocol = IPPROTO_TCP;
+ client->watch = g_io_add_watch(client->channel,
+ G_IO_IN, tcp_client_event,
+ (gpointer)client);
- request_id += 2;
- if (request_id == 0x0000 || request_id == 0xffff)
- request_id += 2;
+ client->ifdata = ifdata;
- req->srcid = buf[2] | (buf[3] << 8);
- req->dstid = request_id;
- req->altid = request_id + 1;
- req->request_len = len;
+ debug("client %d created %p", client_sk, client);
+ } else {
+ debug("client %d already exists %p", client_sk, client);
+ }
- buf[2] = req->dstid & 0xff;
- buf[3] = req->dstid >> 8;
+ if (!client->buf) {
+ client->buf = g_try_malloc(TCP_MAX_BUF_LEN);
+ if (!client->buf)
+ return false;
+ }
+ memset(client->buf, 0, TCP_MAX_BUF_LEN);
+ client->buf_end = 0;
+ client->family = family;
+
+ if (client->timeout == 0)
+ client->timeout = g_timeout_add_seconds(2, client_timeout,
+ client);
+
+ /*
+ * Check how much data there is. If all is there, then we can
+ * proceed normally, otherwise read the bits until everything
+ * is received or timeout occurs.
+ */
+ len = recv(client_sk, client->buf, TCP_MAX_BUF_LEN, 0);
+ if (len < 0) {
+ if (errno == EAGAIN || errno == EWOULDBLOCK) {
+ debug("client %d no data to read, waiting", client_sk);
+ return true;
+ }
- req->numserv = 0;
- req->ifdata = (struct listener_data *) ifdata;
- req->append_domain = FALSE;
- request_list = g_slist_append(request_list, req);
+ debug("client %d cannot read errno %d/%s", client_sk, -errno,
+ strerror(errno));
+ g_hash_table_remove(partial_tcp_req_table,
+ GINT_TO_POINTER(client_sk));
+ return true;
+ }
- for (list = server_list; list; list = list->next) {
- struct server_data *data = list->data;
- GList *domains;
+ if (len < 2) {
+ debug("client %d not enough data to read, waiting", client_sk);
+ client->buf_end += len;
+ return true;
+ }
- if (data->protocol != IPPROTO_UDP || data->enabled == FALSE)
- continue;
+ msg_len = get_msg_len(client->buf);
+ if (msg_len > TCP_MAX_BUF_LEN) {
+ debug("client %d invalid message length %u ignoring packet",
+ client_sk, msg_len);
+ g_hash_table_remove(partial_tcp_req_table,
+ GINT_TO_POINTER(client_sk));
+ return true;
+ }
- server = create_server(data->interface, NULL,
- data->server, IPPROTO_TCP);
+ /*
+ * The packet length bytes do not contain the total message length,
+ * that is the reason to -2 below.
+ */
+#if defined TIZEN_EXT
+ if (msg_len > (unsigned int)(len - 2)) {
+#else
+ if (msg_len != (unsigned int)(len - 2)) {
+#endif
+ debug("client %d sent %d bytes but expecting %u pending %d",
+ client_sk, len, msg_len + 2, msg_len + 2 - len);
- /*
- * If server is NULL, we're not connected yet.
- * Copy the relevant buffers and continue with
- * the next nameserver.
- * The request will actually be sent once we're
- * properly connected over TCP to this nameserver.
- */
- if (server == NULL) {
- req->request = g_try_malloc0(req->request_len);
- if (req->request == NULL)
- return TRUE;
+ client->buf_end += len;
+ return true;
+ }
- memcpy(req->request, buf, req->request_len);
+ return read_tcp_data(client, client_addr, *client_addr_len, len);
+}
- req->name = g_try_malloc0(sizeof(query));
- if (req->name == NULL) {
- g_free(req->request);
- return TRUE;
- }
- memcpy(req->name, query, sizeof(query));
+static gboolean tcp4_listener_event(GIOChannel *channel, GIOCondition condition,
+ gpointer user_data)
+{
+ struct listener_data *ifdata = user_data;
- continue;
- }
+ return tcp_listener_event(channel, condition, ifdata, AF_INET,
+ &ifdata->tcp4_listener_watch);
+}
- if (req->timeout > 0)
- g_source_remove(req->timeout);
+static gboolean tcp6_listener_event(GIOChannel *channel, GIOCondition condition,
+ gpointer user_data)
+{
+ struct listener_data *ifdata = user_data;
+
+ return tcp_listener_event(channel, condition, user_data, AF_INET6,
+ &ifdata->tcp6_listener_watch);
+}
- for (domains = data->domains; domains;
- domains = domains->next) {
- char *dom = domains->data;
+#if defined TIZEN_EXT
+struct request_data * create_request(int sk, unsigned char *buf, size_t len,
+ const struct sockaddr *to, socklen_t tolen,
+ int protocol)
+{
+ struct request_data *req;
+ req = g_try_new0(struct request_data, 1);
+ if (!req)
+ return NULL;
+ memcpy(&req->sa, to, tolen);
+ req->sa_len = tolen;
+ req->client_sk = sk;
+ req->protocol = protocol;
+ req->request_len = len;
+ req->request = g_malloc(len);
+ memcpy(req->request, buf, len);
+ return req;
- DBG("Adding domain %s to %s", dom, server->server);
+}
+static gboolean send_response_timeout (gpointer user_data)
+{
+ struct request_data *req = user_data;
- server->domains = g_list_append(server->domains,
- g_strdup(dom));
- }
+ send_response(req->client_sk, req->request,(size_t) req->request_len, (const struct sockaddr *)&req->sa,
+ (socklen_t)req->sa_len, req->protocol);
+ g_free(req->request);
+ g_free(req);
- req->timeout = g_timeout_add_seconds(30, request_timeout, req);
- ns_resolv(server, req, buf, query);
- }
+ return FALSE;
- return TRUE;
}
+#endif
-static gboolean udp_listener_event(GIOChannel *channel, GIOCondition condition,
- gpointer user_data)
+static bool udp_listener_event(GIOChannel *channel, GIOCondition condition,
+ struct listener_data *ifdata, int family,
+ guint *listener_watch)
{
unsigned char buf[768];
char query[512];
struct request_data *req;
- struct sockaddr_in6 client_addr;
- socklen_t client_addr_len = sizeof(client_addr);
+ struct sockaddr_in6 client_addr6;
+ socklen_t client_addr6_len = sizeof(client_addr6);
+ struct sockaddr_in client_addr4;
+ socklen_t client_addr4_len = sizeof(client_addr4);
+ void *client_addr;
+ socklen_t *client_addr_len;
int sk, err, len;
- struct listener_data *ifdata = user_data;
if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
+#if defined TIZEN_EXT
+ connman_error("Error %d with UDP listener channel", condition);
+
+ recover_listener(channel, ifdata);
+#else
connman_error("Error with UDP listener channel");
- ifdata->udp_listener_watch = 0;
- return FALSE;
+ *listener_watch = 0;
+#endif
+ return false;
}
sk = g_io_channel_unix_get_fd(channel);
- memset(&client_addr, 0, client_addr_len);
- len = recvfrom(sk, buf, sizeof(buf), 0, (void *)&client_addr,
- &client_addr_len);
+ if (family == AF_INET) {
+ client_addr = &client_addr4;
+ client_addr_len = &client_addr4_len;
+ } else {
+ client_addr = &client_addr6;
+ client_addr_len = &client_addr6_len;
+ }
+
+ memset(client_addr, 0, *client_addr_len);
+ len = recvfrom(sk, buf, sizeof(buf), 0, client_addr, client_addr_len);
if (len < 2)
- return TRUE;
+ return true;
- DBG("Received %d bytes (id 0x%04x)", len, buf[0] | buf[1] << 8);
+ debug("Received %d bytes (id 0x%04x)", len, buf[0] | buf[1] << 8);
err = parse_request(buf, len, query, sizeof(query));
if (err < 0 || (g_slist_length(server_list) == 0)) {
- send_response(sk, buf, len, (void *)&client_addr,
- client_addr_len, IPPROTO_UDP);
- return TRUE;
+#if defined TIZEN_EXT
+ /** TEMP Fix
+ * Reason: In tizen6.0 same code working fine because it seems some delay in 6.0 platform
+ * where as in tizen6.5 this loop is continuously executing due to this unable to receive
+ * the response from telephony deamon and wpa_supplicant. To stop continuously execution
+ * of this code added 10ms delay.
+ */
+ req = create_request(sk, buf, len, client_addr,
+ *client_addr_len, IPPROTO_UDP);
+ if(!req)
+ return true;;
+ g_timeout_add(10, send_response_timeout, req);
+#else
+ send_response(sk, buf, len, client_addr,
+ *client_addr_len, IPPROTO_UDP);
+#endif
+ return true;
}
req = g_try_new0(struct request_data, 1);
- if (req == NULL)
- return TRUE;
+ if (!req)
+ return true;
- memcpy(&req->sa, &client_addr, client_addr_len);
- req->sa_len = client_addr_len;
+ memcpy(&req->sa, client_addr, *client_addr_len);
+ req->sa_len = *client_addr_len;
req->client_sk = 0;
req->protocol = IPPROTO_UDP;
-
- request_id += 2;
- if (request_id == 0x0000 || request_id == 0xffff)
- request_id += 2;
+ req->family = family;
req->srcid = buf[0] | (buf[1] << 8);
- req->dstid = request_id;
- req->altid = request_id + 1;
+ req->dstid = get_id();
+ req->altid = get_id();
req->request_len = len;
buf[0] = req->dstid & 0xff;
buf[1] = req->dstid >> 8;
req->numserv = 0;
- req->ifdata = (struct listener_data *) ifdata;
+ req->ifdata = ifdata;
+ req->append_domain = false;
+
+ if (resolv(req, buf, query)) {
+ /* a cached result was sent, so the request can be released */
+ g_free(req);
+ return true;
+ }
+
+ req->name = g_strdup(query);
+ req->request = g_malloc(len);
+ memcpy(req->request, buf, len);
+#if defined TIZEN_EXT
+ DBG("req %p dstid 0x%04x altid 0x%04x", req, req->dstid, req->altid);
+ req->timeout = g_timeout_add_seconds(30, request_timeout, req);
+#else
req->timeout = g_timeout_add_seconds(5, request_timeout, req);
- req->append_domain = FALSE;
+#endif
request_list = g_slist_append(request_list, req);
- return resolv(req, buf, query);
+ return true;
}
-static int create_dns_listener(int protocol, struct listener_data *ifdata)
+static gboolean udp4_listener_event(GIOChannel *channel, GIOCondition condition,
+ gpointer user_data)
+{
+ struct listener_data *ifdata = user_data;
+
+ return udp_listener_event(channel, condition, ifdata, AF_INET,
+ &ifdata->udp4_listener_watch);
+}
+
+static gboolean udp6_listener_event(GIOChannel *channel, GIOCondition condition,
+ gpointer user_data)
+{
+ struct listener_data *ifdata = user_data;
+
+ return udp_listener_event(channel, condition, user_data, AF_INET6,
+ &ifdata->udp6_listener_watch);
+}
+
+static GIOChannel *get_listener(int family, int protocol, int index)
{
GIOChannel *channel;
const char *proto;
+#if !defined TIZEN_EXT
union {
struct sockaddr sa;
struct sockaddr_in6 sin6;
struct sockaddr_in sin;
} s;
socklen_t slen;
- int sk, type, v6only = 0;
- int family = AF_INET6;
-
+#endif
+ int sk, type;
+#if !defined TIZEN_EXT
+ char *interface;
+#endif
+#if defined TIZEN_EXT
+ int option;
+ int sd_num = 0;
+ int rv;
+ int is_socket_inet = 0;
+#endif
- DBG("interface %s", ifdata->ifname);
+ debug("family %d protocol %d index %d", family, protocol, index);
switch (protocol) {
case IPPROTO_UDP:
break;
default:
- return -EINVAL;
+ return NULL;
+ }
+#if defined TIZEN_EXT
+ sd_num = sd_listen_fds(0);
+ DBG("socket type(%s) systemd number of fds(%d)", proto, sd_num);
+ if(sd_num < 1){
+ DBG("fail to get the fd from systemd");
+ return NULL;
+ }
+
+ if(protocol == IPPROTO_TCP)
+ type = SOCK_STREAM;
+ else
+ type = SOCK_DGRAM;
+
+ for(sk = SD_LISTEN_FDS_START; sk < SD_LISTEN_FDS_START+sd_num; ++sk){
+ rv = sd_is_socket_inet(sk, family, type, -1, 53);
+ if(rv > 0){
+ DBG("socket fd (%d) is passed by systemd", sk);
+ is_socket_inet = 1;
+ break;
+ }
}
+ if (!is_socket_inet) {
+ DBG("socket fd is not matched what connman requests");
+ return NULL;
+ }
+#else
sk = socket(family, type, protocol);
if (sk < 0 && family == AF_INET6 && errno == EAFNOSUPPORT) {
- connman_error("No IPv6 support; DNS proxy listening only on Legacy IP");
- family = AF_INET;
- sk = socket(family, type, protocol);
+ connman_error("No IPv6 support");
+ return NULL;
}
+
if (sk < 0) {
connman_error("Failed to create %s listener socket", proto);
- return -EIO;
+ return NULL;
}
- if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
- ifdata->ifname,
- strlen(ifdata->ifname) + 1) < 0) {
- connman_error("Failed to bind %s listener interface", proto);
- close(sk);
- return -EIO;
- }
- /* Ensure it accepts Legacy IP connections too */
- if (family == AF_INET6 &&
- setsockopt(sk, SOL_IPV6, IPV6_V6ONLY,
- &v6only, sizeof(v6only)) < 0) {
- connman_error("Failed to clear V6ONLY on %s listener socket",
- proto);
+ interface = connman_inet_ifname(index);
+ if (!interface || setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
+ interface,
+ strlen(interface) + 1) < 0) {
+ connman_error("Failed to bind %s listener interface "
+ "for %s (%d/%s)",
+ proto, family == AF_INET ? "IPv4" : "IPv6",
+ -errno, strerror(errno));
close(sk);
- return -EIO;
+ g_free(interface);
+ return NULL;
}
+ g_free(interface);
- if (family == AF_INET) {
+ if (family == AF_INET6) {
+ memset(&s.sin6, 0, sizeof(s.sin6));
+ s.sin6.sin6_family = AF_INET6;
+ s.sin6.sin6_port = htons(53);
+ slen = sizeof(s.sin6);
+
+ if (__connman_inet_get_interface_address(index,
+ AF_INET6,
+ &s.sin6.sin6_addr) < 0) {
+ /* So we could not find suitable IPv6 address for
+ * the interface. This could happen if we have
+ * disabled IPv6 for the interface.
+ */
+ close(sk);
+ return NULL;
+ }
+
+ } else if (family == AF_INET) {
memset(&s.sin, 0, sizeof(s.sin));
s.sin.sin_family = AF_INET;
s.sin.sin_port = htons(53);
- s.sin.sin_addr.s_addr = htonl(INADDR_ANY);
slen = sizeof(s.sin);
+
+ if (__connman_inet_get_interface_address(index,
+ AF_INET,
+ &s.sin.sin_addr) < 0) {
+ close(sk);
+ return NULL;
+ }
} else {
- memset(&s.sin6, 0, sizeof(s.sin6));
- s.sin6.sin6_family = AF_INET6;
- s.sin6.sin6_port = htons(53);
- s.sin6.sin6_addr = in6addr_any;
- slen = sizeof(s.sin6);
+ close(sk);
+ return NULL;
}
+#endif
+#if defined TIZEN_EXT
+ /* When ConnMan crashed,
+ * probably DNS listener cannot bind existing address */
+ option = 1;
+ if (setsockopt(sk, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option)) < 0) {
+ connman_error("Failed to set socket option SO_REUSEADDR");
+ close(sk);
+ return NULL;
+ }
+#endif
+#if !defined TIZEN_EXT
if (bind(sk, &s.sa, slen) < 0) {
connman_error("Failed to bind %s listener socket", proto);
close(sk);
- return -EIO;
+ return NULL;
}
+#endif
- if (protocol == IPPROTO_TCP && listen(sk, 10) < 0) {
- connman_error("Failed to listen on TCP socket");
- close(sk);
- return -EIO;
+ if (protocol == IPPROTO_TCP) {
+
+#if !defined TIZEN_EXT
+ if (listen(sk, 10) < 0) {
+ connman_error("Failed to listen on TCP socket %d/%s",
+ -errno, strerror(errno));
+ close(sk);
+ return NULL;
+ }
+
+#endif
+ fcntl(sk, F_SETFL, O_NONBLOCK);
}
channel = g_io_channel_unix_new(sk);
- if (channel == NULL) {
+ if (!channel) {
connman_error("Failed to create %s listener channel", proto);
close(sk);
- return -EIO;
+ return NULL;
}
g_io_channel_set_close_on_unref(channel, TRUE);
+ return channel;
+}
+
+#define UDP_IPv4_FAILED 0x01
+#define TCP_IPv4_FAILED 0x02
+#define UDP_IPv6_FAILED 0x04
+#define TCP_IPv6_FAILED 0x08
+#define UDP_FAILED (UDP_IPv4_FAILED | UDP_IPv6_FAILED)
+#define TCP_FAILED (TCP_IPv4_FAILED | TCP_IPv6_FAILED)
+#define IPv6_FAILED (UDP_IPv6_FAILED | TCP_IPv6_FAILED)
+#define IPv4_FAILED (UDP_IPv4_FAILED | TCP_IPv4_FAILED)
+
+static int create_dns_listener(int protocol, struct listener_data *ifdata)
+{
+ int ret = 0;
+
if (protocol == IPPROTO_TCP) {
- ifdata->tcp_listener_channel = channel;
- ifdata->tcp_listener_watch = g_io_add_watch(channel,
- G_IO_IN, tcp_listener_event, (gpointer) ifdata);
+ ifdata->tcp4_listener_channel = get_listener(AF_INET, protocol,
+ ifdata->index);
+ if (ifdata->tcp4_listener_channel)
+#if defined TIZEN_EXT
+ ifdata->tcp4_listener_watch =
+ g_io_add_watch(ifdata->tcp4_listener_channel,
+ G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
+ tcp4_listener_event, (gpointer)ifdata);
+#else
+ ifdata->tcp4_listener_watch =
+ g_io_add_watch(ifdata->tcp4_listener_channel,
+ G_IO_IN, tcp4_listener_event,
+ (gpointer)ifdata);
+#endif
+ else
+ ret |= TCP_IPv4_FAILED;
+
+ ifdata->tcp6_listener_channel = get_listener(AF_INET6, protocol,
+ ifdata->index);
+ if (ifdata->tcp6_listener_channel)
+#if defined TIZEN_EXT
+ ifdata->tcp6_listener_watch =
+ g_io_add_watch(ifdata->tcp6_listener_channel,
+ G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
+ tcp6_listener_event, (gpointer)ifdata);
+#else
+ ifdata->tcp6_listener_watch =
+ g_io_add_watch(ifdata->tcp6_listener_channel,
+ G_IO_IN, tcp6_listener_event,
+ (gpointer)ifdata);
+#endif
+ else
+ ret |= TCP_IPv6_FAILED;
} else {
- ifdata->udp_listener_channel = channel;
- ifdata->udp_listener_watch = g_io_add_watch(channel,
- G_IO_IN, udp_listener_event, (gpointer) ifdata);
+ ifdata->udp4_listener_channel = get_listener(AF_INET, protocol,
+ ifdata->index);
+ if (ifdata->udp4_listener_channel)
+#if defined TIZEN_EXT
+ ifdata->udp4_listener_watch =
+ g_io_add_watch(ifdata->udp4_listener_channel,
+ G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
+ udp4_listener_event, (gpointer)ifdata);
+#else
+ ifdata->udp4_listener_watch =
+ g_io_add_watch(ifdata->udp4_listener_channel,
+ G_IO_IN, udp4_listener_event,
+ (gpointer)ifdata);
+#endif
+ else
+ ret |= UDP_IPv4_FAILED;
+
+ ifdata->udp6_listener_channel = get_listener(AF_INET6, protocol,
+ ifdata->index);
+ if (ifdata->udp6_listener_channel)
+#if defined TIZEN_EXT
+ ifdata->udp6_listener_watch =
+ g_io_add_watch(ifdata->udp6_listener_channel,
+ G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
+ udp6_listener_event, (gpointer)ifdata);
+#else
+ ifdata->udp6_listener_watch =
+ g_io_add_watch(ifdata->udp6_listener_channel,
+ G_IO_IN, udp6_listener_event,
+ (gpointer)ifdata);
+#endif
+ else
+ ret |= UDP_IPv6_FAILED;
}
- return 0;
+ return ret;
}
static void destroy_udp_listener(struct listener_data *ifdata)
{
- DBG("interface %s", ifdata->ifname);
+ DBG("index %d", ifdata->index);
- if (ifdata->udp_listener_watch > 0)
- g_source_remove(ifdata->udp_listener_watch);
+ if (ifdata->udp4_listener_watch > 0)
+ g_source_remove(ifdata->udp4_listener_watch);
- g_io_channel_unref(ifdata->udp_listener_channel);
+ if (ifdata->udp6_listener_watch > 0)
+ g_source_remove(ifdata->udp6_listener_watch);
+
+ if (ifdata->udp4_listener_channel)
+ g_io_channel_unref(ifdata->udp4_listener_channel);
+ if (ifdata->udp6_listener_channel)
+ g_io_channel_unref(ifdata->udp6_listener_channel);
}
static void destroy_tcp_listener(struct listener_data *ifdata)
{
- DBG("interface %s", ifdata->ifname);
+ DBG("index %d", ifdata->index);
- if (ifdata->tcp_listener_watch > 0)
- g_source_remove(ifdata->tcp_listener_watch);
+ if (ifdata->tcp4_listener_watch > 0)
+ g_source_remove(ifdata->tcp4_listener_watch);
+ if (ifdata->tcp6_listener_watch > 0)
+ g_source_remove(ifdata->tcp6_listener_watch);
- g_io_channel_unref(ifdata->tcp_listener_channel);
+ if (ifdata->tcp4_listener_channel)
+ g_io_channel_unref(ifdata->tcp4_listener_channel);
+ if (ifdata->tcp6_listener_channel)
+ g_io_channel_unref(ifdata->tcp6_listener_channel);
}
static int create_listener(struct listener_data *ifdata)
{
- int err;
+ int err, index;
err = create_dns_listener(IPPROTO_UDP, ifdata);
- if (err < 0)
- return err;
+ if ((err & UDP_FAILED) == UDP_FAILED)
+ return -EIO;
- err = create_dns_listener(IPPROTO_TCP, ifdata);
- if (err < 0) {
+ err |= create_dns_listener(IPPROTO_TCP, ifdata);
+ if ((err & TCP_FAILED) == TCP_FAILED) {
destroy_udp_listener(ifdata);
- return err;
+ return -EIO;
}
- if (g_strcmp0(ifdata->ifname, "lo") == 0)
- __connman_resolvfile_append("lo", NULL, "127.0.0.1");
+ index = connman_inet_ifindex("lo");
+ if (ifdata->index == index) {
+ if ((err & IPv6_FAILED) != IPv6_FAILED)
+ __connman_resolvfile_append(index, NULL, "::1");
+
+ if ((err & IPv4_FAILED) != IPv4_FAILED)
+ __connman_resolvfile_append(index, NULL, "127.0.0.1");
+ }
return 0;
}
static void destroy_listener(struct listener_data *ifdata)
{
+ int index;
GSList *list;
- if (g_strcmp0(ifdata->ifname, "lo") == 0)
- __connman_resolvfile_remove("lo", NULL, "127.0.0.1");
-
- for (list = request_pending_list; list; list = list->next) {
- struct request_data *req = list->data;
-
- DBG("Dropping pending request (id 0x%04x -> 0x%04x)",
- req->srcid, req->dstid);
-
- g_free(req->resp);
- g_free(req->request);
- g_free(req->name);
- g_free(req);
- list->data = NULL;
+ index = connman_inet_ifindex("lo");
+ if (ifdata->index == index) {
+ __connman_resolvfile_remove(index, NULL, "127.0.0.1");
+ __connman_resolvfile_remove(index, NULL, "::1");
}
- g_slist_free(request_pending_list);
- request_pending_list = NULL;
-
for (list = request_list; list; list = list->next) {
struct request_data *req = list->data;
- DBG("Dropping request (id 0x%04x -> 0x%04x)",
+ debug("Dropping request (id 0x%04x -> 0x%04x)",
req->srcid, req->dstid);
-
- g_free(req->resp);
- g_free(req->request);
- g_free(req->name);
- g_free(req);
+ destroy_request_data(req);
list->data = NULL;
}
destroy_udp_listener(ifdata);
}
-int __connman_dnsproxy_add_listener(const char *interface)
+int __connman_dnsproxy_add_listener(int index)
{
struct listener_data *ifdata;
int err;
- DBG("interface %s", interface);
+ DBG("index %d", index);
- if (g_hash_table_lookup(listener_table, interface) != NULL)
+ if (index < 0)
+ return -EINVAL;
+
+ if (!listener_table)
+ return -ENOENT;
+
+ if (g_hash_table_lookup(listener_table, GINT_TO_POINTER(index)))
return 0;
ifdata = g_try_new0(struct listener_data, 1);
- if (ifdata == NULL)
+ if (!ifdata)
return -ENOMEM;
- ifdata->ifname = g_strdup(interface);
- ifdata->udp_listener_channel = NULL;
- ifdata->udp_listener_watch = 0;
- ifdata->tcp_listener_channel = NULL;
- ifdata->tcp_listener_watch = 0;
+ ifdata->index = index;
+ ifdata->udp4_listener_channel = NULL;
+ ifdata->udp4_listener_watch = 0;
+ ifdata->tcp4_listener_channel = NULL;
+ ifdata->tcp4_listener_watch = 0;
+ ifdata->udp6_listener_channel = NULL;
+ ifdata->udp6_listener_watch = 0;
+ ifdata->tcp6_listener_channel = NULL;
+ ifdata->tcp6_listener_watch = 0;
err = create_listener(ifdata);
if (err < 0) {
- connman_error("Couldn't create listener for %s err %d",
- interface, err);
- g_free(ifdata->ifname);
+ connman_error("Couldn't create listener for index %d err %d",
+ index, err);
g_free(ifdata);
return err;
}
- g_hash_table_insert(listener_table, ifdata->ifname, ifdata);
+ g_hash_table_insert(listener_table, GINT_TO_POINTER(ifdata->index),
+ ifdata);
return 0;
}
-void __connman_dnsproxy_remove_listener(const char *interface)
+void __connman_dnsproxy_remove_listener(int index)
{
struct listener_data *ifdata;
- DBG("interface %s", interface);
+ DBG("index %d", index);
+
+ if (!listener_table)
+ return;
- ifdata = g_hash_table_lookup(listener_table, interface);
- if (ifdata == NULL)
+ ifdata = g_hash_table_lookup(listener_table, GINT_TO_POINTER(index));
+ if (!ifdata)
return;
destroy_listener(ifdata);
- g_hash_table_remove(listener_table, interface);
+ g_hash_table_remove(listener_table, GINT_TO_POINTER(index));
}
static void remove_listener(gpointer key, gpointer value, gpointer user_data)
{
- __connman_dnsproxy_remove_listener(key);
+ int index = GPOINTER_TO_INT(key);
+ struct listener_data *ifdata = value;
+
+ DBG("index %d", index);
+
+ destroy_listener(ifdata);
+}
+
+static void free_partial_reqs(gpointer value)
+{
+ struct tcp_partial_client_data *data = value;
+
+ client_reset(data);
+ g_free(data);
}
int __connman_dnsproxy_init(void)
{
- int err;
+ int err, index;
DBG("");
- listener_table = g_hash_table_new_full(g_str_hash, g_str_equal,
- g_free, g_free);
- err = __connman_dnsproxy_add_listener("lo");
+ listener_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
+ NULL, g_free);
+
+ partial_tcp_req_table = g_hash_table_new_full(g_direct_hash,
+ g_direct_equal,
+ NULL,
+ free_partial_reqs);
+
+ index = connman_inet_ifindex("lo");
+ err = __connman_dnsproxy_add_listener(index);
if (err < 0)
return err;
return 0;
destroy:
- __connman_dnsproxy_remove_listener("lo");
+ __connman_dnsproxy_remove_listener(index);
g_hash_table_destroy(listener_table);
+ g_hash_table_destroy(partial_tcp_req_table);
return err;
}
+int __connman_dnsproxy_set_mdns(int index, bool enabled)
+{
+ return -ENOTSUP;
+}
+
void __connman_dnsproxy_cleanup(void)
{
DBG("");
+ if (cache_timer) {
+ g_source_remove(cache_timer);
+ cache_timer = 0;
+ }
+
+ if (cache) {
+ g_hash_table_destroy(cache);
+ cache = NULL;
+ }
+
connman_notifier_unregister(&dnsproxy_notifier);
g_hash_table_foreach(listener_table, remove_listener, NULL);
g_hash_table_destroy(listener_table);
+
+ g_hash_table_destroy(partial_tcp_req_table);
+
+ if (ipv4_resolve)
+ g_resolv_unref(ipv4_resolve);
+ if (ipv6_resolve)
+ g_resolv_unref(ipv6_resolve);
}
projects / platform / upstream / connman.git / blobdiff