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 connman_bool_t dnsproxy_enabled = TRUE;
118 static GSList *server_list = NULL;
119 static GSList *request_list = NULL;
120 static GSList *request_pending_list = NULL;
121 static guint16 request_id = 0x0000;
123 static GIOChannel *udp_listener_channel = NULL;
124 static guint udp_listener_watch = 0;
125 static GIOChannel *tcp_listener_channel = NULL;
126 static guint tcp_listener_watch = 0;
128 static int protocol_offset(int protocol)
143 static struct request_data *find_request(guint16 id)
147 for (list = request_list; list; list = list->next) {
148 struct request_data *req = list->data;
150 if (req->dstid == id || req->altid == id)
157 static struct server_data *find_server(const char *interface,
163 DBG("interface %s server %s", interface, server);
165 for (list = server_list; list; list = list->next) {
166 struct server_data *data = list->data;
168 if (interface == NULL && data->interface == NULL &&
169 g_str_equal(data->server, server) == TRUE &&
170 data->protocol == protocol)
173 if (interface == NULL ||
174 data->interface == NULL || data->server == NULL)
177 if (g_str_equal(data->interface, interface) == TRUE &&
178 g_str_equal(data->server, server) == TRUE &&
179 data->protocol == protocol)
187 static void send_response(int sk, unsigned char *buf, int len,
188 const struct sockaddr *to, socklen_t tolen,
191 struct domain_hdr *hdr;
192 int err, offset = protocol_offset(protocol);
202 hdr = (void *) (buf + offset);
204 DBG("id 0x%04x qr %d opcode %d", hdr->id, hdr->qr, hdr->opcode);
213 err = sendto(sk, buf, len, 0, to, tolen);
216 static gboolean request_timeout(gpointer user_data)
218 struct request_data *req = user_data;
220 DBG("id 0x%04x", req->srcid);
225 request_list = g_slist_remove(request_list, req);
228 if (req->resplen > 0 && req->resp != NULL) {
231 sk = g_io_channel_unix_get_fd(udp_listener_channel);
233 err = sendto(sk, req->resp, req->resplen, 0,
234 &req->sa, req->sa_len);
235 } else if (req->request && req->numserv == 0) {
236 struct domain_hdr *hdr;
238 if (req->protocol == IPPROTO_TCP) {
239 hdr = (void *) (req->request + 2);
240 hdr->id = req->srcid;
241 send_response(req->client_sk, req->request,
242 req->request_len, NULL, 0, IPPROTO_TCP);
244 } else if (req->protocol == IPPROTO_UDP) {
247 hdr = (void *) (req->request);
248 hdr->id = req->srcid;
249 sk = g_io_channel_unix_get_fd(udp_listener_channel);
250 send_response(sk, req->request, req->request_len,
251 &req->sa, req->sa_len, IPPROTO_UDP);
261 static int append_query(unsigned char *buf, unsigned int size,
262 const char *query, const char *domain)
264 unsigned char *ptr = buf;
267 DBG("query %s domain %s", query, domain);
269 offset = (char *) query;
270 while (offset != NULL) {
273 tmp = strchr(offset, '.');
275 if (strlen(offset) == 0)
277 *ptr = strlen(offset);
278 memcpy(ptr + 1, offset, strlen(offset));
279 ptr += strlen(offset) + 1;
284 memcpy(ptr + 1, offset, tmp - offset);
285 ptr += tmp - offset + 1;
290 offset = (char *) domain;
291 while (offset != NULL) {
294 tmp = strchr(offset, '.');
296 if (strlen(offset) == 0)
298 *ptr = strlen(offset);
299 memcpy(ptr + 1, offset, strlen(offset));
300 ptr += strlen(offset) + 1;
305 memcpy(ptr + 1, offset, tmp - offset);
306 ptr += tmp - offset + 1;
316 static int ns_resolv(struct server_data *server, struct request_data *req,
317 gpointer request, gpointer name)
322 sk = g_io_channel_unix_get_fd(server->channel);
324 err = send(sk, request, req->request_len, 0);
328 for (list = server->domains; list; list = list->next) {
330 unsigned char alt[1024];
331 struct domain_hdr *hdr = (void *) &alt;
332 int altlen, domlen, offset;
339 offset = protocol_offset(server->protocol);
343 domlen = strlen(domain) + 1;
347 alt[offset] = req->altid & 0xff;
348 alt[offset + 1] = req->altid >> 8;
350 memcpy(alt + offset + 2, request + offset + 2, 10);
351 hdr->qdcount = htons(1);
353 altlen = append_query(alt + offset + 12, sizeof(alt) - 12,
360 memcpy(alt + offset + altlen,
361 request + offset + altlen - domlen,
362 req->request_len - altlen + domlen);
364 if (server->protocol == IPPROTO_TCP) {
365 int req_len = req->request_len + domlen - 1;
367 alt[0] = (req_len >> 8) & 0xff;
368 alt[1] = req_len & 0xff;
371 err = send(sk, alt, req->request_len + domlen + 1, 0);
379 static int forward_dns_reply(unsigned char *reply, int reply_len, int protocol)
381 struct domain_hdr *hdr;
382 struct request_data *req;
383 int dns_id, sk, err, offset = protocol_offset(protocol);
388 hdr = (void *)(reply + offset);
389 dns_id = reply[offset] | reply[offset + 1] << 8;
391 DBG("Received %d bytes (id 0x%04x)", reply_len, dns_id);
393 req = find_request(dns_id);
397 DBG("id 0x%04x rcode %d", hdr->id, hdr->rcode);
399 reply[offset] = req->srcid & 0xff;
400 reply[offset + 1] = req->srcid >> 8;
404 if (hdr->rcode == 0 || req->resp == NULL) {
408 req->resp = g_try_malloc(reply_len);
409 if (req->resp == NULL)
412 memcpy(req->resp, reply, reply_len);
413 req->resplen = reply_len;
416 if (hdr->rcode > 0 && req->numresp < req->numserv)
419 if (req->timeout > 0)
420 g_source_remove(req->timeout);
422 request_list = g_slist_remove(request_list, req);
424 if (protocol == IPPROTO_UDP) {
425 sk = g_io_channel_unix_get_fd(udp_listener_channel);
426 err = sendto(sk, req->resp, req->resplen, 0,
427 &req->sa, req->sa_len);
430 err = send(sk, req->resp, req->resplen, 0);
440 static void destroy_server(struct server_data *server)
444 DBG("interface %s server %s", server->interface, server->server);
446 server_list = g_slist_remove(server_list, server);
448 if (server->watch > 0)
449 g_source_remove(server->watch);
451 if (server->timeout > 0)
452 g_source_remove(server->timeout);
454 g_io_channel_unref(server->channel);
456 if (server->protocol == IPPROTO_UDP)
457 connman_info("Removing DNS server %s", server->server);
459 g_free(server->incoming_reply);
460 g_free(server->server);
461 for (list = server->domains; list; list = list->next) {
462 char *domain = list->data;
464 server->domains = g_list_remove(server->domains, domain);
467 g_free(server->interface);
471 static gboolean udp_server_event(GIOChannel *channel, GIOCondition condition,
474 unsigned char buf[4096];
477 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
478 struct server_data *data = user_data;
480 connman_error("Error with UDP server %s", data->server);
485 sk = g_io_channel_unix_get_fd(channel);
487 len = recv(sk, buf, sizeof(buf), 0);
491 err = forward_dns_reply(buf, len, IPPROTO_UDP);
496 static gboolean tcp_server_event(GIOChannel *channel, GIOCondition condition,
500 struct server_data *server = user_data;
502 sk = g_io_channel_unix_get_fd(channel);
506 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
509 DBG("TCP server channel closed");
512 * Discard any partial response which is buffered; better
513 * to get a proper response from a working server.
515 g_free(server->incoming_reply);
516 server->incoming_reply = NULL;
518 for (list = request_list; list; list = list->next) {
519 struct request_data *req = list->data;
520 struct domain_hdr *hdr;
522 if (req->protocol == IPPROTO_UDP)
525 if (req->request == NULL)
529 * If we're not waiting for any further response
530 * from another name server, then we send an error
531 * response to the client.
533 if (req->numserv && --(req->numserv))
536 hdr = (void *) (req->request + 2);
537 hdr->id = req->srcid;
538 send_response(req->client_sk, req->request,
539 req->request_len, NULL, 0, IPPROTO_TCP);
541 request_list = g_slist_remove(request_list, req);
544 destroy_server(server);
549 if ((condition & G_IO_OUT) && !server->connected) {
552 struct server_data *udp_server;
554 udp_server = find_server(server->interface, server->server,
556 if (udp_server != NULL) {
557 for (domains = udp_server->domains; domains;
558 domains = domains->next) {
559 char *dom = domains->data;
561 DBG("Adding domain %s to %s",
562 dom, server->server);
564 server->domains = g_list_append(server->domains,
569 server->connected = TRUE;
570 server_list = g_slist_append(server_list, server);
572 if (server->timeout > 0) {
573 g_source_remove(server->timeout);
577 for (list = request_list; list; list = list->next) {
578 struct request_data *req = list->data;
580 if (req->protocol == IPPROTO_UDP)
583 DBG("Sending req %s over TCP", (char *)req->name);
585 if (req->timeout > 0)
586 g_source_remove(req->timeout);
588 req->timeout = g_timeout_add_seconds(30,
589 request_timeout, req);
590 ns_resolv(server, req, req->request, req->name);
593 } else if (condition & G_IO_IN) {
594 struct partial_reply *reply = server->incoming_reply;
598 unsigned char reply_len_buf[2];
601 bytes_recv = recv(sk, reply_len_buf, 2, MSG_PEEK);
604 } else if (bytes_recv < 0) {
605 if (errno == EAGAIN || errno == EWOULDBLOCK)
608 connman_error("DNS proxy error %s",
611 } else if (bytes_recv < 2)
614 reply_len = reply_len_buf[1] | reply_len_buf[0] << 8;
617 DBG("TCP reply %d bytes", reply_len);
619 reply = g_try_malloc(sizeof(*reply) + reply_len + 2);
623 reply->len = reply_len;
626 server->incoming_reply = reply;
629 while (reply->received < reply->len) {
630 bytes_recv = recv(sk, reply->buf + reply->received,
631 reply->len - reply->received, 0);
633 connman_error("DNS proxy TCP disconnect");
635 } else if (bytes_recv < 0) {
636 if (errno == EAGAIN || errno == EWOULDBLOCK)
639 connman_error("DNS proxy error %s",
643 reply->received += bytes_recv;
646 forward_dns_reply(reply->buf, reply->received, IPPROTO_TCP);
649 server->incoming_reply = NULL;
651 destroy_server(server);
659 static gboolean tcp_idle_timeout(gpointer user_data)
661 struct server_data *server = user_data;
668 destroy_server(server);
673 static struct server_data *create_server(const char *interface,
674 const char *domain, const char *server,
677 struct addrinfo hints, *rp;
678 struct server_data *data;
681 DBG("interface %s server %s", interface, server);
683 memset(&hints, 0, sizeof(hints));
687 hints.ai_socktype = SOCK_DGRAM;
691 hints.ai_socktype = SOCK_STREAM;
697 hints.ai_family = AF_UNSPEC;
698 hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV | AI_NUMERICHOST;
700 ret = getaddrinfo(server, "53", &hints, &rp);
702 connman_error("Failed to parse server %s address: %s\n",
703 server, gai_strerror(ret));
706 /* Do not blindly copy this code elsewhere; it doesn't loop over the
707 results using ->ai_next as it should. That's OK in *this* case
708 because it was a numeric lookup; we *know* there's only one. */
710 sk = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
712 connman_error("Failed to create server %s socket", server);
717 if (interface != NULL) {
718 if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
719 interface, strlen(interface) + 1) < 0) {
720 connman_error("Failed to bind server %s "
729 data = g_try_new0(struct server_data, 1);
731 connman_error("Failed to allocate server %s data", server);
737 data->channel = g_io_channel_unix_new(sk);
738 if (data->channel == NULL) {
739 connman_error("Failed to create server %s channel", server);
746 g_io_channel_set_close_on_unref(data->channel, TRUE);
748 if (protocol == IPPROTO_TCP) {
749 g_io_channel_set_flags(data->channel, G_IO_FLAG_NONBLOCK, NULL);
750 data->watch = g_io_add_watch(data->channel,
751 G_IO_OUT | G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
752 tcp_server_event, data);
753 data->timeout = g_timeout_add_seconds(30, tcp_idle_timeout,
756 data->watch = g_io_add_watch(data->channel,
757 G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
758 udp_server_event, data);
760 data->interface = g_strdup(interface);
762 data->domains = g_list_append(data->domains, g_strdup(domain));
763 data->server = g_strdup(server);
764 data->protocol = protocol;
766 ret = connect(sk, rp->ai_addr, rp->ai_addrlen);
769 if ((protocol == IPPROTO_TCP && errno != EINPROGRESS) ||
770 protocol == IPPROTO_UDP) {
773 connman_error("Failed to connect to server %s", server);
775 g_source_remove(data->watch);
776 if (data->timeout > 0)
777 g_source_remove(data->timeout);
779 g_io_channel_unref(data->channel);
782 g_free(data->server);
783 g_free(data->interface);
784 for (list = data->domains; list; list = list->next) {
785 char *domain = list->data;
787 data->domains = g_list_remove(data->domains,
796 if (protocol == IPPROTO_UDP) {
797 /* Enable new servers by default */
798 data->enabled = TRUE;
799 connman_info("Adding DNS server %s", data->server);
801 server_list = g_slist_append(server_list, data);
809 static gboolean resolv(struct request_data *req,
810 gpointer request, gpointer name)
814 for (list = server_list; list; list = list->next) {
815 struct server_data *data = list->data;
817 DBG("server %s enabled %d", data->server, data->enabled);
819 if (data->enabled == FALSE)
822 if (data->watch == 0 && data->protocol == IPPROTO_UDP)
823 data->watch = g_io_add_watch(data->channel,
824 G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
825 udp_server_event, data);
827 if (ns_resolv(data, req, request, name) < 0)
834 static void append_domain(const char *interface, const char *domain)
838 DBG("interface %s domain %s", interface, domain);
840 for (list = server_list; list; list = list->next) {
841 struct server_data *data = list->data;
844 gboolean dom_found = FALSE;
846 if (data->interface == NULL)
849 if (g_str_equal(data->interface, interface) == FALSE)
852 for (dom_list = data->domains; dom_list;
853 dom_list = dom_list->next) {
854 dom = dom_list->data;
856 if (g_str_equal(dom, domain)) {
862 if (dom_found == FALSE) {
864 g_list_append(data->domains, g_strdup(domain));
869 int __connman_dnsproxy_append(const char *interface, const char *domain,
872 struct server_data *data;
874 DBG("interface %s server %s", interface, server);
876 if (server == NULL && domain == NULL)
879 if (server == NULL) {
880 append_domain(interface, domain);
885 if (g_str_equal(server, "127.0.0.1") == TRUE)
888 data = find_server(interface, server, IPPROTO_UDP);
890 append_domain(interface, domain);
894 data = create_server(interface, domain, server, IPPROTO_UDP);
901 static void remove_server(const char *interface, const char *domain,
902 const char *server, int protocol)
904 struct server_data *data;
906 data = find_server(interface, server, protocol);
910 destroy_server(data);
913 int __connman_dnsproxy_remove(const char *interface, const char *domain,
916 DBG("interface %s server %s", interface, server);
921 if (g_str_equal(server, "127.0.0.1") == TRUE)
924 remove_server(interface, domain, server, IPPROTO_UDP);
925 remove_server(interface, domain, server, IPPROTO_TCP);
930 void __connman_dnsproxy_flush(void)
934 list = request_pending_list;
936 struct request_data *req = list->data;
940 request_pending_list =
941 g_slist_remove(request_pending_list, req);
942 resolv(req, req->request, req->name);
943 g_free(req->request);
948 static void dnsproxy_offline_mode(connman_bool_t enabled)
952 DBG("enabled %d", enabled);
954 for (list = server_list; list; list = list->next) {
955 struct server_data *data = list->data;
957 if (enabled == FALSE) {
958 connman_info("Enabling DNS server %s", data->server);
959 data->enabled = TRUE;
961 connman_info("Disabling DNS server %s", data->server);
962 data->enabled = FALSE;
967 static void dnsproxy_default_changed(struct connman_service *service)
972 DBG("service %p", service);
974 if (service == NULL) {
975 /* When no services are active, then disable DNS proxying */
976 dnsproxy_offline_mode(TRUE);
980 interface = connman_service_get_interface(service);
981 if (interface == NULL)
984 for (list = server_list; list; list = list->next) {
985 struct server_data *data = list->data;
987 if (g_strcmp0(data->interface, interface) == 0) {
988 connman_info("Enabling DNS server %s", data->server);
989 data->enabled = TRUE;
991 connman_info("Disabling DNS server %s", data->server);
992 data->enabled = FALSE;
999 static struct connman_notifier dnsproxy_notifier = {
1001 .default_changed = dnsproxy_default_changed,
1002 .offline_mode = dnsproxy_offline_mode,
1005 static unsigned char opt_edns0_type[2] = { 0x00, 0x29 };
1007 static int parse_request(unsigned char *buf, int len,
1008 char *name, unsigned int size)
1010 struct domain_hdr *hdr = (void *) buf;
1011 uint16_t qdcount = ntohs(hdr->qdcount);
1012 uint16_t arcount = ntohs(hdr->arcount);
1014 char *last_label = NULL;
1015 unsigned int remain, used = 0;
1020 DBG("id 0x%04x qr %d opcode %d qdcount %d arcount %d",
1021 hdr->id, hdr->qr, hdr->opcode,
1024 if (hdr->qr != 0 || qdcount != 1)
1027 memset(name, 0, size);
1029 ptr = buf + sizeof(struct domain_hdr);
1030 remain = len - sizeof(struct domain_hdr);
1032 while (remain > 0) {
1036 last_label = (char *) (ptr + 1);
1040 if (used + len + 1 > size)
1043 strncat(name, (char *) (ptr + 1), len);
1052 if (last_label && arcount && remain >= 9 && last_label[4] == 0 &&
1053 !memcmp(last_label + 5, opt_edns0_type, 2)) {
1054 uint16_t edns0_bufsize;
1056 edns0_bufsize = last_label[7] << 8 | last_label[8];
1058 DBG("EDNS0 buffer size %u", edns0_bufsize);
1060 /* This is an evil hack until full TCP support has been
1063 * Somtimes the EDNS0 request gets send with a too-small
1064 * buffer size. Since glibc doesn't seem to crash when it
1065 * gets a response biffer then it requested, just bump
1066 * the buffer size up to 4KiB.
1068 if (edns0_bufsize < 0x1000) {
1069 last_label[7] = 0x10;
1070 last_label[8] = 0x00;
1074 DBG("query %s", name);
1079 static gboolean tcp_listener_event(GIOChannel *channel, GIOCondition condition,
1082 unsigned char buf[768];
1084 struct request_data *req;
1085 struct server_data *server;
1086 int sk, client_sk, len, err;
1087 struct sockaddr_in6 client_addr;
1088 socklen_t client_addr_len = sizeof(client_addr);
1091 DBG("condition 0x%x", condition);
1093 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
1094 if (tcp_listener_watch > 0)
1095 g_source_remove(tcp_listener_watch);
1096 tcp_listener_watch = 0;
1098 connman_error("Error with TCP listener channel");
1103 sk = g_io_channel_unix_get_fd(channel);
1105 client_sk = accept(sk, (void *)&client_addr, &client_addr_len);
1106 if (client_sk < 0) {
1107 connman_error("Accept failure on TCP listener");
1108 tcp_listener_watch = 0;
1112 len = recv(client_sk, buf, sizeof(buf), 0);
1116 DBG("Received %d bytes (id 0x%04x)", len, buf[2] | buf[3] << 8);
1118 err = parse_request(buf + 2, len - 2, query, sizeof(query));
1119 if (err < 0 || (g_slist_length(server_list) == 0)) {
1120 send_response(client_sk, buf, len, NULL, 0, IPPROTO_TCP);
1124 req = g_try_new0(struct request_data, 1);
1128 memcpy(&req->sa, &client_addr, client_addr_len);
1129 req->sa_len = client_addr_len;
1130 req->client_sk = client_sk;
1131 req->protocol = IPPROTO_TCP;
1134 if (request_id == 0x0000 || request_id == 0xffff)
1137 req->srcid = buf[2] | (buf[3] << 8);
1138 req->dstid = request_id;
1139 req->altid = request_id + 1;
1140 req->request_len = len;
1142 buf[2] = req->dstid & 0xff;
1143 buf[3] = req->dstid >> 8;
1146 request_list = g_slist_append(request_list, req);
1148 for (list = server_list; list; list = list->next) {
1149 struct server_data *data = list->data;
1152 if (data->protocol != IPPROTO_UDP || data->enabled == FALSE)
1155 server = create_server(data->interface, NULL,
1156 data->server, IPPROTO_TCP);
1159 * If server is NULL, we're not connected yet.
1160 * Copy the relevant buffers and continue with
1161 * the next nameserver.
1162 * The request will actually be sent once we're
1163 * properly connected over TCP to this nameserver.
1165 if (server == NULL) {
1166 req->request = g_try_malloc0(req->request_len);
1167 if (req->request == NULL)
1170 memcpy(req->request, buf, req->request_len);
1172 req->name = g_try_malloc0(sizeof(query));
1173 if (req->name == NULL) {
1174 g_free(req->request);
1177 memcpy(req->name, query, sizeof(query));
1182 if (req->timeout > 0)
1183 g_source_remove(req->timeout);
1185 for (domains = data->domains; domains;
1186 domains = domains->next) {
1187 char *dom = domains->data;
1189 DBG("Adding domain %s to %s", dom, server->server);
1191 server->domains = g_list_append(server->domains,
1195 req->timeout = g_timeout_add_seconds(30, request_timeout, req);
1196 ns_resolv(server, req, buf, query);
1202 static gboolean udp_listener_event(GIOChannel *channel, GIOCondition condition,
1205 unsigned char buf[768];
1207 struct request_data *req;
1208 struct sockaddr_in6 client_addr;
1209 socklen_t client_addr_len = sizeof(client_addr);
1212 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
1213 connman_error("Error with UDP listener channel");
1214 udp_listener_watch = 0;
1218 sk = g_io_channel_unix_get_fd(channel);
1220 memset(&client_addr, 0, client_addr_len);
1221 len = recvfrom(sk, buf, sizeof(buf), 0, (void *)&client_addr,
1226 DBG("Received %d bytes (id 0x%04x)", len, buf[0] | buf[1] << 8);
1228 err = parse_request(buf, len, query, sizeof(query));
1229 if (err < 0 || (g_slist_length(server_list) == 0)) {
1230 send_response(sk, buf, len, (void *)&client_addr,
1231 client_addr_len, IPPROTO_UDP);
1235 req = g_try_new0(struct request_data, 1);
1239 memcpy(&req->sa, &client_addr, client_addr_len);
1240 req->sa_len = client_addr_len;
1242 req->protocol = IPPROTO_UDP;
1245 if (request_id == 0x0000 || request_id == 0xffff)
1248 req->srcid = buf[0] | (buf[1] << 8);
1249 req->dstid = request_id;
1250 req->altid = request_id + 1;
1251 req->request_len = len;
1253 buf[0] = req->dstid & 0xff;
1254 buf[1] = req->dstid >> 8;
1257 req->timeout = g_timeout_add_seconds(5, request_timeout, req);
1258 request_list = g_slist_append(request_list, req);
1260 return resolv(req, buf, query);
1263 static int create_dns_listener(int protocol)
1265 GIOChannel *channel;
1266 const char *ifname = "lo", *proto;
1269 struct sockaddr_in6 sin6;
1270 struct sockaddr_in sin;
1273 int sk, type, v6only = 0;
1274 int family = AF_INET6;
1293 sk = socket(family, type, protocol);
1294 if (sk < 0 && family == AF_INET6 && errno == EAFNOSUPPORT) {
1295 connman_error("No IPv6 support; DNS proxy listening only on Legacy IP");
1297 sk = socket(family, type, protocol);
1300 connman_error("Failed to create %s listener socket", proto);
1304 if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
1305 ifname, strlen(ifname) + 1) < 0) {
1306 connman_error("Failed to bind %s listener interface", proto);
1310 /* Ensure it accepts Legacy IP connections too */
1311 if (family == AF_INET6 &&
1312 setsockopt(sk, SOL_IPV6, IPV6_V6ONLY,
1313 &v6only, sizeof(v6only)) < 0) {
1314 connman_error("Failed to clear V6ONLY on %s listener socket",
1320 if (family == AF_INET) {
1321 memset(&s.sin, 0, sizeof(s.sin));
1322 s.sin.sin_family = AF_INET;
1323 s.sin.sin_port = htons(53);
1324 s.sin.sin_addr.s_addr = htonl(INADDR_ANY);
1325 slen = sizeof(s.sin);
1327 memset(&s.sin6, 0, sizeof(s.sin6));
1328 s.sin6.sin6_family = AF_INET6;
1329 s.sin6.sin6_port = htons(53);
1330 s.sin6.sin6_addr = in6addr_any;
1331 slen = sizeof(s.sin6);
1334 if (bind(sk, &s.sa, slen) < 0) {
1335 connman_error("Failed to bind %s listener socket", proto);
1340 if (protocol == IPPROTO_TCP && listen(sk, 10) < 0) {
1341 connman_error("Failed to listen on TCP socket");
1346 channel = g_io_channel_unix_new(sk);
1347 if (channel == NULL) {
1348 connman_error("Failed to create %s listener channel", proto);
1353 g_io_channel_set_close_on_unref(channel, TRUE);
1355 if (protocol == IPPROTO_TCP) {
1356 tcp_listener_channel = channel;
1357 tcp_listener_watch = g_io_add_watch(channel,
1358 G_IO_IN, tcp_listener_event, NULL);
1360 udp_listener_channel = channel;
1361 udp_listener_watch = g_io_add_watch(channel,
1362 G_IO_IN, udp_listener_event, NULL);
1368 static void destroy_udp_listener(void)
1372 if (udp_listener_watch > 0)
1373 g_source_remove(udp_listener_watch);
1375 g_io_channel_unref(udp_listener_channel);
1378 static void destroy_tcp_listener(void)
1382 if (tcp_listener_watch > 0)
1383 g_source_remove(tcp_listener_watch);
1385 g_io_channel_unref(tcp_listener_channel);
1388 static int create_listener(void)
1392 err = create_dns_listener(IPPROTO_UDP);
1396 err = create_dns_listener(IPPROTO_TCP);
1398 destroy_udp_listener();
1402 __connman_resolvfile_append("lo", NULL, "127.0.0.1");
1407 static void destroy_listener(void)
1411 __connman_resolvfile_remove("lo", NULL, "127.0.0.1");
1413 for (list = request_pending_list; list; list = list->next) {
1414 struct request_data *req = list->data;
1416 DBG("Dropping pending request (id 0x%04x -> 0x%04x)",
1417 req->srcid, req->dstid);
1420 g_free(req->request);
1426 g_slist_free(request_pending_list);
1427 request_pending_list = NULL;
1429 for (list = request_list; list; list = list->next) {
1430 struct request_data *req = list->data;
1432 DBG("Dropping request (id 0x%04x -> 0x%04x)",
1433 req->srcid, req->dstid);
1436 g_free(req->request);
1442 g_slist_free(request_list);
1443 request_list = NULL;
1445 destroy_tcp_listener();
1446 destroy_udp_listener();
1449 int __connman_dnsproxy_init(connman_bool_t dnsproxy)
1453 DBG("dnsproxy %d", dnsproxy);
1455 dnsproxy_enabled = dnsproxy;
1456 if (dnsproxy_enabled == FALSE)
1459 err = create_listener();
1463 err = connman_notifier_register(&dnsproxy_notifier);
1475 void __connman_dnsproxy_cleanup(void)
1479 if (dnsproxy_enabled == FALSE)
1482 connman_notifier_unregister(&dnsproxy_notifier);