5 * Copyright (C) 2007-2010 Intel Corporation. All rights reserved.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
30 #include <arpa/inet.h>
31 #include <netinet/in.h>
32 #include <sys/types.h>
33 #include <sys/socket.h>
40 #if __BYTE_ORDER == __LITTLE_ENDIAN
55 } __attribute__ ((packed));
56 #elif __BYTE_ORDER == __BIG_ENDIAN
71 } __attribute__ ((packed));
73 #error "Unknown byte order"
76 struct partial_reply {
92 struct partial_reply *incoming_reply;
97 struct sockaddr_in6 __sin6; /* Only for the length */
117 static GSList *server_list = NULL;
118 static GSList *request_list = NULL;
119 static GSList *request_pending_list = NULL;
120 static guint16 request_id = 0x0000;
122 static GIOChannel *udp_listener_channel = NULL;
123 static guint udp_listener_watch = 0;
124 static GIOChannel *tcp_listener_channel = NULL;
125 static guint tcp_listener_watch = 0;
127 static int protocol_offset(int protocol)
142 static struct request_data *find_request(guint16 id)
146 for (list = request_list; list; list = list->next) {
147 struct request_data *req = list->data;
149 if (req->dstid == id || req->altid == id)
156 static struct server_data *find_server(const char *interface,
162 DBG("interface %s server %s", interface, server);
164 for (list = server_list; list; list = list->next) {
165 struct server_data *data = list->data;
167 if (interface == NULL && data->interface == NULL &&
168 g_str_equal(data->server, server) == TRUE &&
169 data->protocol == protocol)
172 if (interface == NULL ||
173 data->interface == NULL || data->server == NULL)
176 if (g_str_equal(data->interface, interface) == TRUE &&
177 g_str_equal(data->server, server) == TRUE &&
178 data->protocol == protocol)
186 static void send_response(int sk, unsigned char *buf, int len,
187 const struct sockaddr *to, socklen_t tolen,
190 struct domain_hdr *hdr;
191 int err, offset = protocol_offset(protocol);
201 hdr = (void *) (buf + offset);
203 DBG("id 0x%04x qr %d opcode %d", hdr->id, hdr->qr, hdr->opcode);
212 err = sendto(sk, buf, len, 0, to, tolen);
215 static gboolean request_timeout(gpointer user_data)
217 struct request_data *req = user_data;
219 DBG("id 0x%04x", req->srcid);
224 request_list = g_slist_remove(request_list, req);
227 if (req->resplen > 0 && req->resp != NULL) {
230 sk = g_io_channel_unix_get_fd(udp_listener_channel);
232 err = sendto(sk, req->resp, req->resplen, 0,
233 &req->sa, req->sa_len);
234 } else if (req->request && req->numserv == 0) {
235 struct domain_hdr *hdr;
237 if (req->protocol == IPPROTO_TCP) {
238 hdr = (void *) (req->request + 2);
239 hdr->id = req->srcid;
240 send_response(req->client_sk, req->request,
241 req->request_len, NULL, 0, IPPROTO_TCP);
243 } else if (req->protocol == IPPROTO_UDP) {
246 hdr = (void *) (req->request);
247 hdr->id = req->srcid;
248 sk = g_io_channel_unix_get_fd(udp_listener_channel);
249 send_response(sk, req->request, req->request_len,
250 &req->sa, req->sa_len, IPPROTO_UDP);
260 static int append_query(unsigned char *buf, unsigned int size,
261 const char *query, const char *domain)
263 unsigned char *ptr = buf;
266 DBG("query %s domain %s", query, domain);
268 offset = (char *) query;
269 while (offset != NULL) {
272 tmp = strchr(offset, '.');
274 if (strlen(offset) == 0)
276 *ptr = strlen(offset);
277 memcpy(ptr + 1, offset, strlen(offset));
278 ptr += strlen(offset) + 1;
283 memcpy(ptr + 1, offset, tmp - offset);
284 ptr += tmp - offset + 1;
289 offset = (char *) domain;
290 while (offset != NULL) {
293 tmp = strchr(offset, '.');
295 if (strlen(offset) == 0)
297 *ptr = strlen(offset);
298 memcpy(ptr + 1, offset, strlen(offset));
299 ptr += strlen(offset) + 1;
304 memcpy(ptr + 1, offset, tmp - offset);
305 ptr += tmp - offset + 1;
315 static int ns_resolv(struct server_data *server, struct request_data *req,
316 gpointer request, gpointer name)
321 sk = g_io_channel_unix_get_fd(server->channel);
323 err = send(sk, request, req->request_len, 0);
327 for (list = server->domains; list; list = list->next) {
329 unsigned char alt[1024];
330 struct domain_hdr *hdr = (void *) &alt;
331 int altlen, domlen, offset;
338 offset = protocol_offset(server->protocol);
342 domlen = strlen(domain) + 1;
346 alt[offset] = req->altid & 0xff;
347 alt[offset + 1] = req->altid >> 8;
349 memcpy(alt + offset + 2, request + offset + 2, 10);
350 hdr->qdcount = htons(1);
352 altlen = append_query(alt + offset + 12, sizeof(alt) - 12,
359 memcpy(alt + offset + altlen,
360 request + offset + altlen - domlen,
361 req->request_len - altlen + domlen);
363 if (server->protocol == IPPROTO_TCP) {
364 int req_len = req->request_len + domlen - 1;
366 alt[0] = (req_len >> 8) & 0xff;
367 alt[1] = req_len & 0xff;
370 err = send(sk, alt, req->request_len + domlen + 1, 0);
378 static int forward_dns_reply(unsigned char *reply, int reply_len, int protocol)
380 struct domain_hdr *hdr;
381 struct request_data *req;
382 int dns_id, sk, err, offset = protocol_offset(protocol);
387 hdr = (void *)(reply + offset);
388 dns_id = reply[offset] | reply[offset + 1] << 8;
390 DBG("Received %d bytes (id 0x%04x)", reply_len, dns_id);
392 req = find_request(dns_id);
396 DBG("id 0x%04x rcode %d", hdr->id, hdr->rcode);
398 reply[offset] = req->srcid & 0xff;
399 reply[offset + 1] = req->srcid >> 8;
403 if (hdr->rcode == 0 || req->resp == NULL) {
407 req->resp = g_try_malloc(reply_len);
408 if (req->resp == NULL)
411 memcpy(req->resp, reply, reply_len);
412 req->resplen = reply_len;
415 if (hdr->rcode > 0 && req->numresp < req->numserv)
418 if (req->timeout > 0)
419 g_source_remove(req->timeout);
421 request_list = g_slist_remove(request_list, req);
423 if (protocol == IPPROTO_UDP) {
424 sk = g_io_channel_unix_get_fd(udp_listener_channel);
425 err = sendto(sk, req->resp, req->resplen, 0,
426 &req->sa, req->sa_len);
429 err = send(sk, req->resp, req->resplen, 0);
439 static void destroy_server(struct server_data *server)
443 DBG("interface %s server %s", server->interface, server->server);
445 server_list = g_slist_remove(server_list, server);
447 if (server->watch > 0)
448 g_source_remove(server->watch);
450 if (server->timeout > 0)
451 g_source_remove(server->timeout);
453 g_io_channel_unref(server->channel);
455 if (server->protocol == IPPROTO_UDP)
456 connman_info("Removing DNS server %s", server->server);
458 g_free(server->incoming_reply);
459 g_free(server->server);
460 for (list = server->domains; list; list = list->next) {
461 char *domain = list->data;
463 server->domains = g_list_remove(server->domains, domain);
466 g_free(server->interface);
470 static gboolean udp_server_event(GIOChannel *channel, GIOCondition condition,
473 unsigned char buf[4096];
476 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
477 struct server_data *data = user_data;
479 connman_error("Error with UDP server %s", data->server);
484 sk = g_io_channel_unix_get_fd(channel);
486 len = recv(sk, buf, sizeof(buf), 0);
490 err = forward_dns_reply(buf, len, IPPROTO_UDP);
495 static gboolean tcp_server_event(GIOChannel *channel, GIOCondition condition,
499 struct server_data *server = user_data;
501 sk = g_io_channel_unix_get_fd(channel);
505 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
508 DBG("TCP server channel closed");
511 * Discard any partial response which is buffered; better
512 * to get a proper response from a working server.
514 g_free(server->incoming_reply);
515 server->incoming_reply = NULL;
517 for (list = request_list; list; list = list->next) {
518 struct request_data *req = list->data;
519 struct domain_hdr *hdr;
521 if (req->protocol == IPPROTO_UDP)
524 if (req->request == NULL)
528 * If we're not waiting for any further response
529 * from another name server, then we send an error
530 * response to the client.
532 if (req->numserv && --(req->numserv))
535 hdr = (void *) (req->request + 2);
536 hdr->id = req->srcid;
537 send_response(req->client_sk, req->request,
538 req->request_len, NULL, 0, IPPROTO_TCP);
540 request_list = g_slist_remove(request_list, req);
543 destroy_server(server);
548 if ((condition & G_IO_OUT) && !server->connected) {
551 struct server_data *udp_server;
553 udp_server = find_server(server->interface, server->server,
555 if (udp_server != NULL) {
556 for (domains = udp_server->domains; domains;
557 domains = domains->next) {
558 char *dom = domains->data;
560 DBG("Adding domain %s to %s",
561 dom, server->server);
563 server->domains = g_list_append(server->domains,
568 server->connected = TRUE;
569 server_list = g_slist_append(server_list, server);
571 if (server->timeout > 0) {
572 g_source_remove(server->timeout);
576 for (list = request_list; list; list = list->next) {
577 struct request_data *req = list->data;
579 if (req->protocol == IPPROTO_UDP)
582 DBG("Sending req %s over TCP", (char *)req->name);
584 if (req->timeout > 0)
585 g_source_remove(req->timeout);
587 req->timeout = g_timeout_add_seconds(30,
588 request_timeout, req);
589 ns_resolv(server, req, req->request, req->name);
592 } else if (condition & G_IO_IN) {
593 struct partial_reply *reply = server->incoming_reply;
597 unsigned char reply_len_buf[2];
600 bytes_recv = recv(sk, reply_len_buf, 2, MSG_PEEK);
603 } else if (bytes_recv < 0) {
604 if (errno == EAGAIN || errno == EWOULDBLOCK)
607 connman_error("DNS proxy error %s",
610 } else if (bytes_recv < 2)
613 reply_len = reply_len_buf[1] | reply_len_buf[0] << 8;
616 DBG("TCP reply %d bytes", reply_len);
618 reply = g_try_malloc(sizeof(*reply) + reply_len + 2);
622 reply->len = reply_len;
625 server->incoming_reply = reply;
628 while (reply->received < reply->len) {
629 bytes_recv = recv(sk, reply->buf + reply->received,
630 reply->len - reply->received, 0);
632 connman_error("DNS proxy TCP disconnect");
634 } else if (bytes_recv < 0) {
635 if (errno == EAGAIN || errno == EWOULDBLOCK)
638 connman_error("DNS proxy error %s",
642 reply->received += bytes_recv;
645 forward_dns_reply(reply->buf, reply->received, IPPROTO_TCP);
648 server->incoming_reply = NULL;
650 destroy_server(server);
658 static gboolean tcp_idle_timeout(gpointer user_data)
660 struct server_data *server = user_data;
667 destroy_server(server);
672 static struct server_data *create_server(const char *interface,
673 const char *domain, const char *server,
676 struct addrinfo hints, *rp;
677 struct server_data *data;
680 DBG("interface %s server %s", interface, server);
682 memset(&hints, 0, sizeof(hints));
686 hints.ai_socktype = SOCK_DGRAM;
690 hints.ai_socktype = SOCK_STREAM;
696 hints.ai_family = AF_UNSPEC;
697 hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV | AI_NUMERICHOST;
699 ret = getaddrinfo(server, "53", &hints, &rp);
701 connman_error("Failed to parse server %s address: %s\n",
702 server, gai_strerror(ret));
705 /* Do not blindly copy this code elsewhere; it doesn't loop over the
706 results using ->ai_next as it should. That's OK in *this* case
707 because it was a numeric lookup; we *know* there's only one. */
709 sk = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
711 connman_error("Failed to create server %s socket", server);
716 if (interface != NULL) {
717 if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
718 interface, strlen(interface) + 1) < 0) {
719 connman_error("Failed to bind server %s "
728 data = g_try_new0(struct server_data, 1);
730 connman_error("Failed to allocate server %s data", server);
736 data->channel = g_io_channel_unix_new(sk);
737 if (data->channel == NULL) {
738 connman_error("Failed to create server %s channel", server);
745 g_io_channel_set_close_on_unref(data->channel, TRUE);
747 if (protocol == IPPROTO_TCP) {
748 g_io_channel_set_flags(data->channel, G_IO_FLAG_NONBLOCK, NULL);
749 data->watch = g_io_add_watch(data->channel,
750 G_IO_OUT | G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
751 tcp_server_event, data);
752 data->timeout = g_timeout_add_seconds(30, tcp_idle_timeout,
755 data->watch = g_io_add_watch(data->channel,
756 G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
757 udp_server_event, data);
759 data->interface = g_strdup(interface);
761 data->domains = g_list_append(data->domains, g_strdup(domain));
762 data->server = g_strdup(server);
763 data->protocol = protocol;
765 ret = connect(sk, rp->ai_addr, rp->ai_addrlen);
768 if ((protocol == IPPROTO_TCP && errno != EINPROGRESS) ||
769 protocol == IPPROTO_UDP) {
772 connman_error("Failed to connect to server %s", server);
774 g_source_remove(data->watch);
775 if (data->timeout > 0)
776 g_source_remove(data->timeout);
778 g_io_channel_unref(data->channel);
781 g_free(data->server);
782 g_free(data->interface);
783 for (list = data->domains; list; list = list->next) {
784 char *domain = list->data;
786 data->domains = g_list_remove(data->domains,
795 if (protocol == IPPROTO_UDP) {
796 /* Enable new servers by default */
797 data->enabled = TRUE;
798 connman_info("Adding DNS server %s", data->server);
800 server_list = g_slist_append(server_list, data);
808 static gboolean resolv(struct request_data *req,
809 gpointer request, gpointer name)
813 for (list = server_list; list; list = list->next) {
814 struct server_data *data = list->data;
816 DBG("server %s enabled %d", data->server, data->enabled);
818 if (data->enabled == FALSE)
821 if (data->watch == 0 && data->protocol == IPPROTO_UDP)
822 data->watch = g_io_add_watch(data->channel,
823 G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
824 udp_server_event, data);
826 if (ns_resolv(data, req, request, name) < 0)
833 static void append_domain(const char *interface, const char *domain)
837 DBG("interface %s domain %s", interface, domain);
839 for (list = server_list; list; list = list->next) {
840 struct server_data *data = list->data;
843 gboolean dom_found = FALSE;
845 if (data->interface == NULL)
848 if (g_str_equal(data->interface, interface) == FALSE)
851 for (dom_list = data->domains; dom_list;
852 dom_list = dom_list->next) {
853 dom = dom_list->data;
855 if (g_str_equal(dom, domain)) {
861 if (dom_found == FALSE) {
863 g_list_append(data->domains, g_strdup(domain));
868 int __connman_dnsproxy_append(const char *interface, const char *domain,
871 struct server_data *data;
873 DBG("interface %s server %s", interface, server);
875 if (server == NULL && domain == NULL)
878 if (server == NULL) {
879 append_domain(interface, domain);
884 if (g_str_equal(server, "127.0.0.1") == TRUE)
887 data = find_server(interface, server, IPPROTO_UDP);
889 append_domain(interface, domain);
893 data = create_server(interface, domain, server, IPPROTO_UDP);
900 static void remove_server(const char *interface, const char *domain,
901 const char *server, int protocol)
903 struct server_data *data;
905 data = find_server(interface, server, protocol);
909 destroy_server(data);
912 int __connman_dnsproxy_remove(const char *interface, const char *domain,
915 DBG("interface %s server %s", interface, server);
920 if (g_str_equal(server, "127.0.0.1") == TRUE)
923 remove_server(interface, domain, server, IPPROTO_UDP);
924 remove_server(interface, domain, server, IPPROTO_TCP);
929 void __connman_dnsproxy_flush(void)
933 list = request_pending_list;
935 struct request_data *req = list->data;
939 request_pending_list =
940 g_slist_remove(request_pending_list, req);
941 resolv(req, req->request, req->name);
942 g_free(req->request);
947 static void dnsproxy_offline_mode(connman_bool_t enabled)
951 DBG("enabled %d", enabled);
953 for (list = server_list; list; list = list->next) {
954 struct server_data *data = list->data;
956 if (enabled == FALSE) {
957 connman_info("Enabling DNS server %s", data->server);
958 data->enabled = TRUE;
960 connman_info("Disabling DNS server %s", data->server);
961 data->enabled = FALSE;
966 static void dnsproxy_default_changed(struct connman_service *service)
971 DBG("service %p", service);
973 if (service == NULL) {
974 /* When no services are active, then disable DNS proxying */
975 dnsproxy_offline_mode(TRUE);
979 interface = connman_service_get_interface(service);
980 if (interface == NULL)
983 for (list = server_list; list; list = list->next) {
984 struct server_data *data = list->data;
986 if (g_strcmp0(data->interface, interface) == 0) {
987 connman_info("Enabling DNS server %s", data->server);
988 data->enabled = TRUE;
990 connman_info("Disabling DNS server %s", data->server);
991 data->enabled = FALSE;
998 static struct connman_notifier dnsproxy_notifier = {
1000 .default_changed = dnsproxy_default_changed,
1001 .offline_mode = dnsproxy_offline_mode,
1004 static unsigned char opt_edns0_type[2] = { 0x00, 0x29 };
1006 static int parse_request(unsigned char *buf, int len,
1007 char *name, unsigned int size)
1009 struct domain_hdr *hdr = (void *) buf;
1010 uint16_t qdcount = ntohs(hdr->qdcount);
1011 uint16_t arcount = ntohs(hdr->arcount);
1013 char *last_label = NULL;
1014 unsigned int remain, used = 0;
1019 DBG("id 0x%04x qr %d opcode %d qdcount %d arcount %d",
1020 hdr->id, hdr->qr, hdr->opcode,
1023 if (hdr->qr != 0 || qdcount != 1)
1026 memset(name, 0, size);
1028 ptr = buf + sizeof(struct domain_hdr);
1029 remain = len - sizeof(struct domain_hdr);
1031 while (remain > 0) {
1035 last_label = (char *) (ptr + 1);
1039 if (used + len + 1 > size)
1042 strncat(name, (char *) (ptr + 1), len);
1051 if (last_label && arcount && remain >= 9 && last_label[4] == 0 &&
1052 !memcmp(last_label + 5, opt_edns0_type, 2)) {
1053 uint16_t edns0_bufsize;
1055 edns0_bufsize = last_label[7] << 8 | last_label[8];
1057 DBG("EDNS0 buffer size %u", edns0_bufsize);
1059 /* This is an evil hack until full TCP support has been
1062 * Somtimes the EDNS0 request gets send with a too-small
1063 * buffer size. Since glibc doesn't seem to crash when it
1064 * gets a response biffer then it requested, just bump
1065 * the buffer size up to 4KiB.
1067 if (edns0_bufsize < 0x1000) {
1068 last_label[7] = 0x10;
1069 last_label[8] = 0x00;
1073 DBG("query %s", name);
1078 static gboolean tcp_listener_event(GIOChannel *channel, GIOCondition condition,
1081 unsigned char buf[768];
1083 struct request_data *req;
1084 struct server_data *server;
1085 int sk, client_sk, len, err;
1086 struct sockaddr_in6 client_addr;
1087 socklen_t client_addr_len = sizeof(client_addr);
1090 DBG("condition 0x%x", condition);
1092 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
1093 if (tcp_listener_watch > 0)
1094 g_source_remove(tcp_listener_watch);
1095 tcp_listener_watch = 0;
1097 connman_error("Error with TCP listener channel");
1102 sk = g_io_channel_unix_get_fd(channel);
1104 client_sk = accept(sk, (void *)&client_addr, &client_addr_len);
1105 if (client_sk < 0) {
1106 connman_error("Accept failure on TCP listener");
1107 tcp_listener_watch = 0;
1111 len = recv(client_sk, buf, sizeof(buf), 0);
1115 DBG("Received %d bytes (id 0x%04x)", len, buf[2] | buf[3] << 8);
1117 err = parse_request(buf + 2, len - 2, query, sizeof(query));
1118 if (err < 0 || (g_slist_length(server_list) == 0)) {
1119 send_response(client_sk, buf, len, NULL, 0, IPPROTO_TCP);
1123 req = g_try_new0(struct request_data, 1);
1127 memcpy(&req->sa, &client_addr, client_addr_len);
1128 req->sa_len = client_addr_len;
1129 req->client_sk = client_sk;
1130 req->protocol = IPPROTO_TCP;
1133 if (request_id == 0x0000 || request_id == 0xffff)
1136 req->srcid = buf[2] | (buf[3] << 8);
1137 req->dstid = request_id;
1138 req->altid = request_id + 1;
1139 req->request_len = len;
1141 buf[2] = req->dstid & 0xff;
1142 buf[3] = req->dstid >> 8;
1145 request_list = g_slist_append(request_list, req);
1147 for (list = server_list; list; list = list->next) {
1148 struct server_data *data = list->data;
1151 if (data->protocol != IPPROTO_UDP || data->enabled == FALSE)
1154 server = create_server(data->interface, NULL,
1155 data->server, IPPROTO_TCP);
1158 * If server is NULL, we're not connected yet.
1159 * Copy the relevant buffers and continue with
1160 * the next nameserver.
1161 * The request will actually be sent once we're
1162 * properly connected over TCP to this nameserver.
1164 if (server == NULL) {
1165 req->request = g_try_malloc0(req->request_len);
1166 if (req->request == NULL)
1169 memcpy(req->request, buf, req->request_len);
1171 req->name = g_try_malloc0(sizeof(query));
1172 if (req->name == NULL) {
1173 g_free(req->request);
1176 memcpy(req->name, query, sizeof(query));
1181 if (req->timeout > 0)
1182 g_source_remove(req->timeout);
1184 for (domains = data->domains; domains;
1185 domains = domains->next) {
1186 char *dom = domains->data;
1188 DBG("Adding domain %s to %s", dom, server->server);
1190 server->domains = g_list_append(server->domains,
1194 req->timeout = g_timeout_add_seconds(30, request_timeout, req);
1195 ns_resolv(server, req, buf, query);
1201 static gboolean udp_listener_event(GIOChannel *channel, GIOCondition condition,
1204 unsigned char buf[768];
1206 struct request_data *req;
1207 struct sockaddr_in6 client_addr;
1208 socklen_t client_addr_len = sizeof(client_addr);
1211 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
1212 connman_error("Error with UDP listener channel");
1213 udp_listener_watch = 0;
1217 sk = g_io_channel_unix_get_fd(channel);
1219 memset(&client_addr, 0, client_addr_len);
1220 len = recvfrom(sk, buf, sizeof(buf), 0, (void *)&client_addr,
1225 DBG("Received %d bytes (id 0x%04x)", len, buf[0] | buf[1] << 8);
1227 err = parse_request(buf, len, query, sizeof(query));
1228 if (err < 0 || (g_slist_length(server_list) == 0)) {
1229 send_response(sk, buf, len, (void *)&client_addr,
1230 client_addr_len, IPPROTO_UDP);
1234 req = g_try_new0(struct request_data, 1);
1238 memcpy(&req->sa, &client_addr, client_addr_len);
1239 req->sa_len = client_addr_len;
1241 req->protocol = IPPROTO_UDP;
1244 if (request_id == 0x0000 || request_id == 0xffff)
1247 req->srcid = buf[0] | (buf[1] << 8);
1248 req->dstid = request_id;
1249 req->altid = request_id + 1;
1250 req->request_len = len;
1252 buf[0] = req->dstid & 0xff;
1253 buf[1] = req->dstid >> 8;
1256 req->timeout = g_timeout_add_seconds(5, request_timeout, req);
1257 request_list = g_slist_append(request_list, req);
1259 return resolv(req, buf, query);
1262 static int create_dns_listener(int protocol)
1264 GIOChannel *channel;
1265 const char *ifname = "lo", *proto;
1268 struct sockaddr_in6 sin6;
1269 struct sockaddr_in sin;
1272 int sk, type, v6only = 0;
1273 int family = AF_INET6;
1292 sk = socket(family, type, protocol);
1293 if (sk < 0 && family == AF_INET6 && errno == EAFNOSUPPORT) {
1294 connman_error("No IPv6 support; DNS proxy listening only on Legacy IP");
1296 sk = socket(family, type, protocol);
1299 connman_error("Failed to create %s listener socket", proto);
1303 if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
1304 ifname, strlen(ifname) + 1) < 0) {
1305 connman_error("Failed to bind %s listener interface", proto);
1309 /* Ensure it accepts Legacy IP connections too */
1310 if (family == AF_INET6 &&
1311 setsockopt(sk, SOL_IPV6, IPV6_V6ONLY,
1312 &v6only, sizeof(v6only)) < 0) {
1313 connman_error("Failed to clear V6ONLY on %s listener socket",
1319 if (family == AF_INET) {
1320 memset(&s.sin, 0, sizeof(s.sin));
1321 s.sin.sin_family = AF_INET;
1322 s.sin.sin_port = htons(53);
1323 s.sin.sin_addr.s_addr = htonl(INADDR_ANY);
1324 slen = sizeof(s.sin);
1326 memset(&s.sin6, 0, sizeof(s.sin6));
1327 s.sin6.sin6_family = AF_INET6;
1328 s.sin6.sin6_port = htons(53);
1329 s.sin6.sin6_addr = in6addr_any;
1330 slen = sizeof(s.sin6);
1333 if (bind(sk, &s.sa, slen) < 0) {
1334 connman_error("Failed to bind %s listener socket", proto);
1339 if (protocol == IPPROTO_TCP && listen(sk, 10) < 0) {
1340 connman_error("Failed to listen on TCP socket");
1345 channel = g_io_channel_unix_new(sk);
1346 if (channel == NULL) {
1347 connman_error("Failed to create %s listener channel", proto);
1352 g_io_channel_set_close_on_unref(channel, TRUE);
1354 if (protocol == IPPROTO_TCP) {
1355 tcp_listener_channel = channel;
1356 tcp_listener_watch = g_io_add_watch(channel,
1357 G_IO_IN, tcp_listener_event, NULL);
1359 udp_listener_channel = channel;
1360 udp_listener_watch = g_io_add_watch(channel,
1361 G_IO_IN, udp_listener_event, NULL);
1367 static void destroy_udp_listener(void)
1371 if (udp_listener_watch > 0)
1372 g_source_remove(udp_listener_watch);
1374 g_io_channel_unref(udp_listener_channel);
1377 static void destroy_tcp_listener(void)
1381 if (tcp_listener_watch > 0)
1382 g_source_remove(tcp_listener_watch);
1384 g_io_channel_unref(tcp_listener_channel);
1387 static int create_listener(void)
1391 err = create_dns_listener(IPPROTO_UDP);
1395 err = create_dns_listener(IPPROTO_TCP);
1397 destroy_udp_listener();
1401 __connman_resolvfile_append("lo", NULL, "127.0.0.1");
1406 static void destroy_listener(void)
1410 __connman_resolvfile_remove("lo", NULL, "127.0.0.1");
1412 for (list = request_pending_list; list; list = list->next) {
1413 struct request_data *req = list->data;
1415 DBG("Dropping pending request (id 0x%04x -> 0x%04x)",
1416 req->srcid, req->dstid);
1419 g_free(req->request);
1425 g_slist_free(request_pending_list);
1426 request_pending_list = NULL;
1428 for (list = request_list; list; list = list->next) {
1429 struct request_data *req = list->data;
1431 DBG("Dropping request (id 0x%04x -> 0x%04x)",
1432 req->srcid, req->dstid);
1435 g_free(req->request);
1441 g_slist_free(request_list);
1442 request_list = NULL;
1444 destroy_tcp_listener();
1445 destroy_udp_listener();
1448 int __connman_dnsproxy_init(void)
1454 err = create_listener();
1458 err = connman_notifier_register(&dnsproxy_notifier);
1470 void __connman_dnsproxy_cleanup(void)
1474 connman_notifier_unregister(&dnsproxy_notifier);