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 */
115 struct listener_data *ifdata;
118 struct listener_data {
120 GIOChannel *udp_listener_channel;
121 guint udp_listener_watch;
122 GIOChannel *tcp_listener_channel;
123 guint tcp_listener_watch;
126 static GSList *server_list = NULL;
127 static GSList *request_list = NULL;
128 static GSList *request_pending_list = NULL;
129 static guint16 request_id = 0x0000;
130 static GHashTable *listener_table = NULL;
132 static int protocol_offset(int protocol)
147 static struct request_data *find_request(guint16 id)
151 for (list = request_list; list; list = list->next) {
152 struct request_data *req = list->data;
154 if (req->dstid == id || req->altid == id)
161 static struct server_data *find_server(const char *interface,
167 DBG("interface %s server %s", interface, server);
169 for (list = server_list; list; list = list->next) {
170 struct server_data *data = list->data;
172 if (interface == NULL && data->interface == NULL &&
173 g_str_equal(data->server, server) == TRUE &&
174 data->protocol == protocol)
177 if (interface == NULL ||
178 data->interface == NULL || data->server == NULL)
181 if (g_str_equal(data->interface, interface) == TRUE &&
182 g_str_equal(data->server, server) == TRUE &&
183 data->protocol == protocol)
191 static void send_response(int sk, unsigned char *buf, int len,
192 const struct sockaddr *to, socklen_t tolen,
195 struct domain_hdr *hdr;
196 int err, offset = protocol_offset(protocol);
206 hdr = (void *) (buf + offset);
208 DBG("id 0x%04x qr %d opcode %d", hdr->id, hdr->qr, hdr->opcode);
217 err = sendto(sk, buf, len, 0, to, tolen);
222 static gboolean request_timeout(gpointer user_data)
224 struct request_data *req = user_data;
225 struct listener_data *ifdata;
227 DBG("id 0x%04x", req->srcid);
232 ifdata = req->ifdata;
234 request_list = g_slist_remove(request_list, req);
237 if (req->resplen > 0 && req->resp != NULL) {
240 sk = g_io_channel_unix_get_fd(ifdata->udp_listener_channel);
242 err = sendto(sk, req->resp, req->resplen, 0,
243 &req->sa, req->sa_len);
246 } else if (req->request && req->numserv == 0) {
247 struct domain_hdr *hdr;
249 if (req->protocol == IPPROTO_TCP) {
250 hdr = (void *) (req->request + 2);
251 hdr->id = req->srcid;
252 send_response(req->client_sk, req->request,
253 req->request_len, NULL, 0, IPPROTO_TCP);
255 } else if (req->protocol == IPPROTO_UDP) {
258 hdr = (void *) (req->request);
259 hdr->id = req->srcid;
260 sk = g_io_channel_unix_get_fd(
261 ifdata->udp_listener_channel);
262 send_response(sk, req->request, req->request_len,
263 &req->sa, req->sa_len, IPPROTO_UDP);
273 static int append_query(unsigned char *buf, unsigned int size,
274 const char *query, const char *domain)
276 unsigned char *ptr = buf;
279 DBG("query %s domain %s", query, domain);
281 offset = (char *) query;
282 while (offset != NULL) {
285 tmp = strchr(offset, '.');
287 if (strlen(offset) == 0)
289 *ptr = strlen(offset);
290 memcpy(ptr + 1, offset, strlen(offset));
291 ptr += strlen(offset) + 1;
296 memcpy(ptr + 1, offset, tmp - offset);
297 ptr += tmp - offset + 1;
302 offset = (char *) domain;
303 while (offset != NULL) {
306 tmp = strchr(offset, '.');
308 if (strlen(offset) == 0)
310 *ptr = strlen(offset);
311 memcpy(ptr + 1, offset, strlen(offset));
312 ptr += strlen(offset) + 1;
317 memcpy(ptr + 1, offset, tmp - offset);
318 ptr += tmp - offset + 1;
328 static int ns_resolv(struct server_data *server, struct request_data *req,
329 gpointer request, gpointer name)
333 char *dot, *lookup = (char *) name;
335 sk = g_io_channel_unix_get_fd(server->channel);
337 err = send(sk, request, req->request_len, 0);
341 /* If we have more than one dot, we don't add domains */
342 dot = strchr(lookup, '.');
343 if (dot != NULL && dot != lookup + strlen(lookup) - 1)
346 for (list = server->domains; list; list = list->next) {
348 unsigned char alt[1024];
349 struct domain_hdr *hdr = (void *) &alt;
350 int altlen, domlen, offset;
357 offset = protocol_offset(server->protocol);
361 domlen = strlen(domain) + 1;
365 alt[offset] = req->altid & 0xff;
366 alt[offset + 1] = req->altid >> 8;
368 memcpy(alt + offset + 2, request + offset + 2, 10);
369 hdr->qdcount = htons(1);
371 altlen = append_query(alt + offset + 12, sizeof(alt) - 12,
378 memcpy(alt + offset + altlen,
379 request + offset + altlen - domlen,
380 req->request_len - altlen + domlen);
382 if (server->protocol == IPPROTO_TCP) {
383 int req_len = req->request_len + domlen - 1;
385 alt[0] = (req_len >> 8) & 0xff;
386 alt[1] = req_len & 0xff;
389 err = send(sk, alt, req->request_len + domlen + 1, 0);
399 static int forward_dns_reply(unsigned char *reply, int reply_len, int protocol)
401 struct domain_hdr *hdr;
402 struct request_data *req;
403 int dns_id, sk, err, offset = protocol_offset(protocol);
404 struct listener_data *ifdata;
409 hdr = (void *)(reply + offset);
410 dns_id = reply[offset] | reply[offset + 1] << 8;
412 DBG("Received %d bytes (id 0x%04x)", reply_len, dns_id);
414 req = find_request(dns_id);
418 DBG("id 0x%04x rcode %d", hdr->id, hdr->rcode);
420 ifdata = req->ifdata;
422 reply[offset] = req->srcid & 0xff;
423 reply[offset + 1] = req->srcid >> 8;
427 if (hdr->rcode == 0 || req->resp == NULL) {
431 req->resp = g_try_malloc(reply_len);
432 if (req->resp == NULL)
435 memcpy(req->resp, reply, reply_len);
436 req->resplen = reply_len;
439 if (hdr->rcode > 0 && req->numresp < req->numserv)
442 if (req->timeout > 0)
443 g_source_remove(req->timeout);
445 request_list = g_slist_remove(request_list, req);
447 if (protocol == IPPROTO_UDP) {
448 sk = g_io_channel_unix_get_fd(ifdata->udp_listener_channel);
449 err = sendto(sk, req->resp, req->resplen, 0,
450 &req->sa, req->sa_len);
453 err = send(sk, req->resp, req->resplen, 0);
463 static void destroy_server(struct server_data *server)
467 DBG("interface %s server %s", server->interface, server->server);
469 server_list = g_slist_remove(server_list, server);
471 if (server->watch > 0)
472 g_source_remove(server->watch);
474 if (server->timeout > 0)
475 g_source_remove(server->timeout);
477 g_io_channel_unref(server->channel);
479 if (server->protocol == IPPROTO_UDP)
480 connman_info("Removing DNS server %s", server->server);
482 g_free(server->incoming_reply);
483 g_free(server->server);
484 for (list = server->domains; list; list = list->next) {
485 char *domain = list->data;
487 server->domains = g_list_remove(server->domains, domain);
490 g_free(server->interface);
494 static gboolean udp_server_event(GIOChannel *channel, GIOCondition condition,
497 unsigned char buf[4096];
500 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
501 struct server_data *data = user_data;
503 connman_error("Error with UDP server %s", data->server);
508 sk = g_io_channel_unix_get_fd(channel);
510 len = recv(sk, buf, sizeof(buf), 0);
514 err = forward_dns_reply(buf, len, IPPROTO_UDP);
521 static gboolean tcp_server_event(GIOChannel *channel, GIOCondition condition,
525 struct server_data *server = user_data;
527 sk = g_io_channel_unix_get_fd(channel);
531 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
534 DBG("TCP server channel closed");
537 * Discard any partial response which is buffered; better
538 * to get a proper response from a working server.
540 g_free(server->incoming_reply);
541 server->incoming_reply = NULL;
543 for (list = request_list; list; list = list->next) {
544 struct request_data *req = list->data;
545 struct domain_hdr *hdr;
547 if (req->protocol == IPPROTO_UDP)
550 if (req->request == NULL)
554 * If we're not waiting for any further response
555 * from another name server, then we send an error
556 * response to the client.
558 if (req->numserv && --(req->numserv))
561 hdr = (void *) (req->request + 2);
562 hdr->id = req->srcid;
563 send_response(req->client_sk, req->request,
564 req->request_len, NULL, 0, IPPROTO_TCP);
566 request_list = g_slist_remove(request_list, req);
569 destroy_server(server);
574 if ((condition & G_IO_OUT) && !server->connected) {
577 struct server_data *udp_server;
579 udp_server = find_server(server->interface, server->server,
581 if (udp_server != NULL) {
582 for (domains = udp_server->domains; domains;
583 domains = domains->next) {
584 char *dom = domains->data;
586 DBG("Adding domain %s to %s",
587 dom, server->server);
589 server->domains = g_list_append(server->domains,
594 server->connected = TRUE;
595 server_list = g_slist_append(server_list, server);
597 if (server->timeout > 0) {
598 g_source_remove(server->timeout);
602 for (list = request_list; list; list = list->next) {
603 struct request_data *req = list->data;
605 if (req->protocol == IPPROTO_UDP)
608 DBG("Sending req %s over TCP", (char *)req->name);
610 if (req->timeout > 0)
611 g_source_remove(req->timeout);
613 req->timeout = g_timeout_add_seconds(30,
614 request_timeout, req);
615 ns_resolv(server, req, req->request, req->name);
618 } else if (condition & G_IO_IN) {
619 struct partial_reply *reply = server->incoming_reply;
623 unsigned char reply_len_buf[2];
626 bytes_recv = recv(sk, reply_len_buf, 2, MSG_PEEK);
629 } else if (bytes_recv < 0) {
630 if (errno == EAGAIN || errno == EWOULDBLOCK)
633 connman_error("DNS proxy error %s",
636 } else if (bytes_recv < 2)
639 reply_len = reply_len_buf[1] | reply_len_buf[0] << 8;
642 DBG("TCP reply %d bytes", reply_len);
644 reply = g_try_malloc(sizeof(*reply) + reply_len + 2);
648 reply->len = reply_len;
651 server->incoming_reply = reply;
654 while (reply->received < reply->len) {
655 bytes_recv = recv(sk, reply->buf + reply->received,
656 reply->len - reply->received, 0);
658 connman_error("DNS proxy TCP disconnect");
660 } else if (bytes_recv < 0) {
661 if (errno == EAGAIN || errno == EWOULDBLOCK)
664 connman_error("DNS proxy error %s",
668 reply->received += bytes_recv;
671 forward_dns_reply(reply->buf, reply->received, IPPROTO_TCP);
674 server->incoming_reply = NULL;
676 destroy_server(server);
684 static gboolean tcp_idle_timeout(gpointer user_data)
686 struct server_data *server = user_data;
693 destroy_server(server);
698 static struct server_data *create_server(const char *interface,
699 const char *domain, const char *server,
702 struct addrinfo hints, *rp;
703 struct server_data *data;
706 DBG("interface %s server %s", interface, server);
708 memset(&hints, 0, sizeof(hints));
712 hints.ai_socktype = SOCK_DGRAM;
716 hints.ai_socktype = SOCK_STREAM;
722 hints.ai_family = AF_UNSPEC;
723 hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV | AI_NUMERICHOST;
725 ret = getaddrinfo(server, "53", &hints, &rp);
727 connman_error("Failed to parse server %s address: %s\n",
728 server, gai_strerror(ret));
731 /* Do not blindly copy this code elsewhere; it doesn't loop over the
732 results using ->ai_next as it should. That's OK in *this* case
733 because it was a numeric lookup; we *know* there's only one. */
735 sk = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
737 connman_error("Failed to create server %s socket", server);
742 if (interface != NULL) {
743 if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
744 interface, strlen(interface) + 1) < 0) {
745 connman_error("Failed to bind server %s "
754 data = g_try_new0(struct server_data, 1);
756 connman_error("Failed to allocate server %s data", server);
762 data->channel = g_io_channel_unix_new(sk);
763 if (data->channel == NULL) {
764 connman_error("Failed to create server %s channel", server);
771 g_io_channel_set_close_on_unref(data->channel, TRUE);
773 if (protocol == IPPROTO_TCP) {
774 g_io_channel_set_flags(data->channel, G_IO_FLAG_NONBLOCK, NULL);
775 data->watch = g_io_add_watch(data->channel,
776 G_IO_OUT | G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
777 tcp_server_event, data);
778 data->timeout = g_timeout_add_seconds(30, tcp_idle_timeout,
781 data->watch = g_io_add_watch(data->channel,
782 G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
783 udp_server_event, data);
785 data->interface = g_strdup(interface);
787 data->domains = g_list_append(data->domains, g_strdup(domain));
788 data->server = g_strdup(server);
789 data->protocol = protocol;
791 ret = connect(sk, rp->ai_addr, rp->ai_addrlen);
794 if ((protocol == IPPROTO_TCP && errno != EINPROGRESS) ||
795 protocol == IPPROTO_UDP) {
798 connman_error("Failed to connect to server %s", server);
800 g_source_remove(data->watch);
801 if (data->timeout > 0)
802 g_source_remove(data->timeout);
804 g_io_channel_unref(data->channel);
807 g_free(data->server);
808 g_free(data->interface);
809 for (list = data->domains; list; list = list->next) {
810 char *domain = list->data;
812 data->domains = g_list_remove(data->domains,
821 if (protocol == IPPROTO_UDP) {
822 /* Enable new servers by default */
823 data->enabled = TRUE;
824 connman_info("Adding DNS server %s", data->server);
826 server_list = g_slist_append(server_list, data);
834 static gboolean resolv(struct request_data *req,
835 gpointer request, gpointer name)
839 for (list = server_list; list; list = list->next) {
840 struct server_data *data = list->data;
842 DBG("server %s enabled %d", data->server, data->enabled);
844 if (data->enabled == FALSE)
847 if (data->watch == 0 && data->protocol == IPPROTO_UDP)
848 data->watch = g_io_add_watch(data->channel,
849 G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
850 udp_server_event, data);
852 if (ns_resolv(data, req, request, name) < 0)
859 static void append_domain(const char *interface, const char *domain)
863 DBG("interface %s domain %s", interface, domain);
868 for (list = server_list; list; list = list->next) {
869 struct server_data *data = list->data;
872 gboolean dom_found = FALSE;
874 if (data->interface == NULL)
877 if (g_str_equal(data->interface, interface) == FALSE)
880 for (dom_list = data->domains; dom_list;
881 dom_list = dom_list->next) {
882 dom = dom_list->data;
884 if (g_str_equal(dom, domain)) {
890 if (dom_found == FALSE) {
892 g_list_append(data->domains, g_strdup(domain));
897 int __connman_dnsproxy_append(const char *interface, const char *domain,
900 struct server_data *data;
902 DBG("interface %s server %s", interface, server);
904 if (server == NULL && domain == NULL)
907 if (server == NULL) {
908 append_domain(interface, domain);
913 if (g_str_equal(server, "127.0.0.1") == TRUE)
916 data = find_server(interface, server, IPPROTO_UDP);
918 append_domain(interface, domain);
922 data = create_server(interface, domain, server, IPPROTO_UDP);
929 static void remove_server(const char *interface, const char *domain,
930 const char *server, int protocol)
932 struct server_data *data;
934 data = find_server(interface, server, protocol);
938 destroy_server(data);
941 int __connman_dnsproxy_remove(const char *interface, const char *domain,
944 DBG("interface %s server %s", interface, server);
949 if (g_str_equal(server, "127.0.0.1") == TRUE)
952 remove_server(interface, domain, server, IPPROTO_UDP);
953 remove_server(interface, domain, server, IPPROTO_TCP);
958 void __connman_dnsproxy_flush(void)
962 list = request_pending_list;
964 struct request_data *req = list->data;
968 request_pending_list =
969 g_slist_remove(request_pending_list, req);
970 resolv(req, req->request, req->name);
971 g_free(req->request);
976 static void dnsproxy_offline_mode(connman_bool_t enabled)
980 DBG("enabled %d", enabled);
982 for (list = server_list; list; list = list->next) {
983 struct server_data *data = list->data;
985 if (enabled == FALSE) {
986 connman_info("Enabling DNS server %s", data->server);
987 data->enabled = TRUE;
989 connman_info("Disabling DNS server %s", data->server);
990 data->enabled = FALSE;
995 static void dnsproxy_default_changed(struct connman_service *service)
1000 DBG("service %p", service);
1002 if (service == NULL) {
1003 /* When no services are active, then disable DNS proxying */
1004 dnsproxy_offline_mode(TRUE);
1008 interface = connman_service_get_interface(service);
1009 if (interface == NULL)
1012 for (list = server_list; list; list = list->next) {
1013 struct server_data *data = list->data;
1015 if (g_strcmp0(data->interface, interface) == 0) {
1016 connman_info("Enabling DNS server %s", data->server);
1017 data->enabled = TRUE;
1019 connman_info("Disabling DNS server %s", data->server);
1020 data->enabled = FALSE;
1027 static struct connman_notifier dnsproxy_notifier = {
1029 .default_changed = dnsproxy_default_changed,
1030 .offline_mode = dnsproxy_offline_mode,
1033 static unsigned char opt_edns0_type[2] = { 0x00, 0x29 };
1035 static int parse_request(unsigned char *buf, int len,
1036 char *name, unsigned int size)
1038 struct domain_hdr *hdr = (void *) buf;
1039 uint16_t qdcount = ntohs(hdr->qdcount);
1040 uint16_t arcount = ntohs(hdr->arcount);
1042 char *last_label = NULL;
1043 unsigned int remain, used = 0;
1048 DBG("id 0x%04x qr %d opcode %d qdcount %d arcount %d",
1049 hdr->id, hdr->qr, hdr->opcode,
1052 if (hdr->qr != 0 || qdcount != 1)
1055 memset(name, 0, size);
1057 ptr = buf + sizeof(struct domain_hdr);
1058 remain = len - sizeof(struct domain_hdr);
1060 while (remain > 0) {
1064 last_label = (char *) (ptr + 1);
1068 if (used + len + 1 > size)
1071 strncat(name, (char *) (ptr + 1), len);
1080 if (last_label && arcount && remain >= 9 && last_label[4] == 0 &&
1081 !memcmp(last_label + 5, opt_edns0_type, 2)) {
1082 uint16_t edns0_bufsize;
1084 edns0_bufsize = last_label[7] << 8 | last_label[8];
1086 DBG("EDNS0 buffer size %u", edns0_bufsize);
1088 /* This is an evil hack until full TCP support has been
1091 * Somtimes the EDNS0 request gets send with a too-small
1092 * buffer size. Since glibc doesn't seem to crash when it
1093 * gets a response biffer then it requested, just bump
1094 * the buffer size up to 4KiB.
1096 if (edns0_bufsize < 0x1000) {
1097 last_label[7] = 0x10;
1098 last_label[8] = 0x00;
1102 DBG("query %s", name);
1107 static gboolean tcp_listener_event(GIOChannel *channel, GIOCondition condition,
1110 unsigned char buf[768];
1112 struct request_data *req;
1113 struct server_data *server;
1114 int sk, client_sk, len, err;
1115 struct sockaddr_in6 client_addr;
1116 socklen_t client_addr_len = sizeof(client_addr);
1118 struct listener_data *ifdata = user_data;
1120 DBG("condition 0x%x", condition);
1122 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
1123 if (ifdata->tcp_listener_watch > 0)
1124 g_source_remove(ifdata->tcp_listener_watch);
1125 ifdata->tcp_listener_watch = 0;
1127 connman_error("Error with TCP listener channel");
1132 sk = g_io_channel_unix_get_fd(channel);
1134 client_sk = accept(sk, (void *)&client_addr, &client_addr_len);
1135 if (client_sk < 0) {
1136 connman_error("Accept failure on TCP listener");
1137 ifdata->tcp_listener_watch = 0;
1141 len = recv(client_sk, buf, sizeof(buf), 0);
1145 DBG("Received %d bytes (id 0x%04x)", len, buf[2] | buf[3] << 8);
1147 err = parse_request(buf + 2, len - 2, query, sizeof(query));
1148 if (err < 0 || (g_slist_length(server_list) == 0)) {
1149 send_response(client_sk, buf, len, NULL, 0, IPPROTO_TCP);
1153 req = g_try_new0(struct request_data, 1);
1157 memcpy(&req->sa, &client_addr, client_addr_len);
1158 req->sa_len = client_addr_len;
1159 req->client_sk = client_sk;
1160 req->protocol = IPPROTO_TCP;
1163 if (request_id == 0x0000 || request_id == 0xffff)
1166 req->srcid = buf[2] | (buf[3] << 8);
1167 req->dstid = request_id;
1168 req->altid = request_id + 1;
1169 req->request_len = len;
1171 buf[2] = req->dstid & 0xff;
1172 buf[3] = req->dstid >> 8;
1175 req->ifdata = (struct listener_data *) ifdata;
1176 request_list = g_slist_append(request_list, req);
1178 for (list = server_list; list; list = list->next) {
1179 struct server_data *data = list->data;
1182 if (data->protocol != IPPROTO_UDP || data->enabled == FALSE)
1185 server = create_server(data->interface, NULL,
1186 data->server, IPPROTO_TCP);
1189 * If server is NULL, we're not connected yet.
1190 * Copy the relevant buffers and continue with
1191 * the next nameserver.
1192 * The request will actually be sent once we're
1193 * properly connected over TCP to this nameserver.
1195 if (server == NULL) {
1196 req->request = g_try_malloc0(req->request_len);
1197 if (req->request == NULL)
1200 memcpy(req->request, buf, req->request_len);
1202 req->name = g_try_malloc0(sizeof(query));
1203 if (req->name == NULL) {
1204 g_free(req->request);
1207 memcpy(req->name, query, sizeof(query));
1212 if (req->timeout > 0)
1213 g_source_remove(req->timeout);
1215 for (domains = data->domains; domains;
1216 domains = domains->next) {
1217 char *dom = domains->data;
1219 DBG("Adding domain %s to %s", dom, server->server);
1221 server->domains = g_list_append(server->domains,
1225 req->timeout = g_timeout_add_seconds(30, request_timeout, req);
1226 ns_resolv(server, req, buf, query);
1232 static gboolean udp_listener_event(GIOChannel *channel, GIOCondition condition,
1235 unsigned char buf[768];
1237 struct request_data *req;
1238 struct sockaddr_in6 client_addr;
1239 socklen_t client_addr_len = sizeof(client_addr);
1241 struct listener_data *ifdata = user_data;
1243 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
1244 connman_error("Error with UDP listener channel");
1245 ifdata->udp_listener_watch = 0;
1249 sk = g_io_channel_unix_get_fd(channel);
1251 memset(&client_addr, 0, client_addr_len);
1252 len = recvfrom(sk, buf, sizeof(buf), 0, (void *)&client_addr,
1257 DBG("Received %d bytes (id 0x%04x)", len, buf[0] | buf[1] << 8);
1259 err = parse_request(buf, len, query, sizeof(query));
1260 if (err < 0 || (g_slist_length(server_list) == 0)) {
1261 send_response(sk, buf, len, (void *)&client_addr,
1262 client_addr_len, IPPROTO_UDP);
1266 req = g_try_new0(struct request_data, 1);
1270 memcpy(&req->sa, &client_addr, client_addr_len);
1271 req->sa_len = client_addr_len;
1273 req->protocol = IPPROTO_UDP;
1276 if (request_id == 0x0000 || request_id == 0xffff)
1279 req->srcid = buf[0] | (buf[1] << 8);
1280 req->dstid = request_id;
1281 req->altid = request_id + 1;
1282 req->request_len = len;
1284 buf[0] = req->dstid & 0xff;
1285 buf[1] = req->dstid >> 8;
1288 req->ifdata = (struct listener_data *) ifdata;
1289 req->timeout = g_timeout_add_seconds(5, request_timeout, req);
1290 request_list = g_slist_append(request_list, req);
1292 return resolv(req, buf, query);
1295 static int create_dns_listener(int protocol, const char *ifname)
1297 GIOChannel *channel;
1301 struct sockaddr_in6 sin6;
1302 struct sockaddr_in sin;
1305 int sk, type, v6only = 0;
1306 int family = AF_INET6;
1307 struct listener_data *ifdata;
1309 DBG("interface %s", ifname);
1311 ifdata = g_hash_table_lookup(listener_table, ifname);
1330 sk = socket(family, type, protocol);
1331 if (sk < 0 && family == AF_INET6 && errno == EAFNOSUPPORT) {
1332 connman_error("No IPv6 support; DNS proxy listening only on Legacy IP");
1334 sk = socket(family, type, protocol);
1337 connman_error("Failed to create %s listener socket", proto);
1341 if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
1342 ifname, strlen(ifname) + 1) < 0) {
1343 connman_error("Failed to bind %s listener interface", proto);
1347 /* Ensure it accepts Legacy IP connections too */
1348 if (family == AF_INET6 &&
1349 setsockopt(sk, SOL_IPV6, IPV6_V6ONLY,
1350 &v6only, sizeof(v6only)) < 0) {
1351 connman_error("Failed to clear V6ONLY on %s listener socket",
1357 if (family == AF_INET) {
1358 memset(&s.sin, 0, sizeof(s.sin));
1359 s.sin.sin_family = AF_INET;
1360 s.sin.sin_port = htons(53);
1361 s.sin.sin_addr.s_addr = htonl(INADDR_ANY);
1362 slen = sizeof(s.sin);
1364 memset(&s.sin6, 0, sizeof(s.sin6));
1365 s.sin6.sin6_family = AF_INET6;
1366 s.sin6.sin6_port = htons(53);
1367 s.sin6.sin6_addr = in6addr_any;
1368 slen = sizeof(s.sin6);
1371 if (bind(sk, &s.sa, slen) < 0) {
1372 connman_error("Failed to bind %s listener socket", proto);
1377 if (protocol == IPPROTO_TCP && listen(sk, 10) < 0) {
1378 connman_error("Failed to listen on TCP socket");
1383 channel = g_io_channel_unix_new(sk);
1384 if (channel == NULL) {
1385 connman_error("Failed to create %s listener channel", proto);
1390 g_io_channel_set_close_on_unref(channel, TRUE);
1392 if (protocol == IPPROTO_TCP) {
1393 ifdata->tcp_listener_channel = channel;
1394 ifdata->tcp_listener_watch = g_io_add_watch(channel,
1395 G_IO_IN, tcp_listener_event, (gpointer) ifdata);
1397 ifdata->udp_listener_channel = channel;
1398 ifdata->udp_listener_watch = g_io_add_watch(channel,
1399 G_IO_IN, udp_listener_event, (gpointer) ifdata);
1405 static void destroy_udp_listener(const char *interface)
1407 struct listener_data *ifdata;
1409 DBG("interface %s", interface);
1411 ifdata = g_hash_table_lookup(listener_table, interface);
1415 if (ifdata->udp_listener_watch > 0)
1416 g_source_remove(ifdata->udp_listener_watch);
1418 g_io_channel_unref(ifdata->udp_listener_channel);
1421 static void destroy_tcp_listener(const char *interface)
1423 struct listener_data *ifdata;
1425 DBG("interface %s", interface);
1427 ifdata = g_hash_table_lookup(listener_table, interface);
1431 if (ifdata->tcp_listener_watch > 0)
1432 g_source_remove(ifdata->tcp_listener_watch);
1434 g_io_channel_unref(ifdata->tcp_listener_channel);
1437 static int create_listener(const char *interface)
1441 err = create_dns_listener(IPPROTO_UDP, interface);
1445 err = create_dns_listener(IPPROTO_TCP, interface);
1447 destroy_udp_listener(interface);
1451 if (g_strcmp0(interface, "lo") == 0)
1452 __connman_resolvfile_append("lo", NULL, "127.0.0.1");
1457 static void destroy_listener(const char *interface)
1461 if (interface == NULL)
1464 if (g_strcmp0(interface, "lo") == 0)
1465 __connman_resolvfile_remove("lo", NULL, "127.0.0.1");
1467 for (list = request_pending_list; list; list = list->next) {
1468 struct request_data *req = list->data;
1470 DBG("Dropping pending request (id 0x%04x -> 0x%04x)",
1471 req->srcid, req->dstid);
1474 g_free(req->request);
1480 g_slist_free(request_pending_list);
1481 request_pending_list = NULL;
1483 for (list = request_list; list; list = list->next) {
1484 struct request_data *req = list->data;
1486 DBG("Dropping request (id 0x%04x -> 0x%04x)",
1487 req->srcid, req->dstid);
1490 g_free(req->request);
1496 g_slist_free(request_list);
1497 request_list = NULL;
1499 destroy_tcp_listener(interface);
1500 destroy_udp_listener(interface);
1503 int __connman_dnsproxy_add_listener(const char *interface)
1505 struct listener_data *ifdata;
1508 DBG("interface %s", interface);
1510 if (g_hash_table_lookup(listener_table, interface) != NULL)
1513 ifdata = g_try_new0(struct listener_data, 1);
1517 ifdata->ifname = g_strdup(interface);
1518 ifdata->udp_listener_channel = NULL;
1519 ifdata->udp_listener_watch = 0;
1520 ifdata->tcp_listener_channel = NULL;
1521 ifdata->tcp_listener_watch = 0;
1522 g_hash_table_insert(listener_table, ifdata->ifname, ifdata);
1524 err = create_listener(interface);
1530 void __connman_dnsproxy_remove_listener(const char *interface)
1532 DBG("interface %s", interface);
1534 destroy_listener(interface);
1536 g_hash_table_remove(listener_table, interface);
1539 static void remove_listener(gpointer key, gpointer value, gpointer user_data)
1541 __connman_dnsproxy_remove_listener(key);
1544 int __connman_dnsproxy_init(void)
1550 listener_table = g_hash_table_new_full(g_str_hash, g_str_equal,
1552 err = __connman_dnsproxy_add_listener("lo");
1556 err = connman_notifier_register(&dnsproxy_notifier);
1563 __connman_dnsproxy_remove_listener("lo");
1564 g_hash_table_destroy(listener_table);
1569 void __connman_dnsproxy_cleanup(void)
1573 connman_notifier_unregister(&dnsproxy_notifier);
1575 g_hash_table_foreach(listener_table, remove_listener, NULL);
1577 g_hash_table_destroy(listener_table);