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>
38 #define CONNMAN_API_SUBJECT_TO_CHANGE
39 #include <connman/ondemand.h>
43 #if __BYTE_ORDER == __LITTLE_ENDIAN
58 } __attribute__ ((packed));
59 #elif __BYTE_ORDER == __BIG_ENDIAN
74 } __attribute__ ((packed));
76 #error "Unknown byte order"
79 struct partial_reply {
95 struct partial_reply *incoming_reply;
100 struct sockaddr_in6 __sin6; /* Only for the length */
120 static GSList *server_list = NULL;
121 static GSList *request_list = NULL;
122 static GSList *request_pending_list = NULL;
123 static guint16 request_id = 0x0000;
125 static GIOChannel *udp_listener_channel = NULL;
126 static guint udp_listener_watch = 0;
127 static GIOChannel *tcp_listener_channel = NULL;
128 static guint tcp_listener_watch = 0;
130 static int protocol_offset(int protocol)
145 static struct request_data *find_request(guint16 id)
149 for (list = request_list; list; list = list->next) {
150 struct request_data *req = list->data;
152 if (req->dstid == id || req->altid == id)
159 static struct server_data *find_server(const char *interface,
165 DBG("interface %s server %s", interface, server);
167 for (list = server_list; list; list = list->next) {
168 struct server_data *data = list->data;
170 if (data->interface == NULL || data->server == NULL)
173 if (g_str_equal(data->interface, interface) == TRUE &&
174 g_str_equal(data->server, server) == TRUE &&
175 data->protocol == protocol)
183 static void send_response(int sk, unsigned char *buf, int len,
184 const struct sockaddr *to, socklen_t tolen,
187 struct domain_hdr *hdr;
188 int err, offset = protocol_offset(protocol);
198 hdr = (void *) (buf + offset);
200 DBG("id 0x%04x qr %d opcode %d", hdr->id, hdr->qr, hdr->opcode);
209 err = sendto(sk, buf, len, 0, to, tolen);
212 static gboolean request_timeout(gpointer user_data)
214 struct request_data *req = user_data;
216 DBG("id 0x%04x", req->srcid);
221 request_list = g_slist_remove(request_list, req);
224 if (req->resplen > 0 && req->resp != NULL) {
227 sk = g_io_channel_unix_get_fd(udp_listener_channel);
229 err = sendto(sk, req->resp, req->resplen, 0,
230 &req->sa, req->sa_len);
231 } else if (req->request && req->numserv == 0) {
232 struct domain_hdr *hdr;
234 if (req->protocol == IPPROTO_TCP) {
235 hdr = (void *) (req->request + 2);
236 hdr->id = req->srcid;
237 send_response(req->client_sk, req->request,
238 req->request_len, NULL, 0, IPPROTO_TCP);
240 } else if (req->protocol == IPPROTO_UDP) {
243 hdr = (void *) (req->request);
244 hdr->id = req->srcid;
245 sk = g_io_channel_unix_get_fd(udp_listener_channel);
246 send_response(sk, req->request, req->request_len,
247 &req->sa, req->sa_len, IPPROTO_UDP);
257 static int append_query(unsigned char *buf, unsigned int size,
258 const char *query, const char *domain)
260 unsigned char *ptr = buf;
263 DBG("query %s domain %s", query, domain);
265 offset = (char *) query;
266 while (offset != NULL) {
269 tmp = strchr(offset, '.');
271 if (strlen(offset) == 0)
273 *ptr = strlen(offset);
274 memcpy(ptr + 1, offset, strlen(offset));
275 ptr += strlen(offset) + 1;
280 memcpy(ptr + 1, offset, tmp - offset);
281 ptr += tmp - offset + 1;
286 offset = (char *) domain;
287 while (offset != NULL) {
290 tmp = strchr(offset, '.');
292 if (strlen(offset) == 0)
294 *ptr = strlen(offset);
295 memcpy(ptr + 1, offset, strlen(offset));
296 ptr += strlen(offset) + 1;
301 memcpy(ptr + 1, offset, tmp - offset);
302 ptr += tmp - offset + 1;
312 static int ns_resolv(struct server_data *server, struct request_data *req,
313 gpointer request, gpointer name)
318 sk = g_io_channel_unix_get_fd(server->channel);
320 err = send(sk, request, req->request_len, 0);
324 for (list = server->domains; list; list = list->next) {
326 unsigned char alt[1024];
327 struct domain_hdr *hdr = (void *) &alt;
328 int altlen, domlen, offset;
335 offset = protocol_offset(server->protocol);
339 domlen = strlen(domain) + 1;
343 alt[offset] = req->altid & 0xff;
344 alt[offset + 1] = req->altid >> 8;
346 memcpy(alt + offset + 2, request + offset + 2, 10);
347 hdr->qdcount = htons(1);
349 altlen = append_query(alt + offset + 12, sizeof(alt) - 12,
356 memcpy(alt + offset + altlen,
357 request + offset + altlen - domlen,
358 req->request_len - altlen + domlen);
360 if (server->protocol == IPPROTO_TCP) {
361 int req_len = req->request_len + domlen - 1;
363 alt[0] = (req_len >> 8) & 0xff;
364 alt[1] = req_len & 0xff;
367 err = send(sk, alt, req->request_len + domlen + 1, 0);
375 static int forward_dns_reply(unsigned char *reply, int reply_len, int protocol)
377 struct domain_hdr *hdr;
378 struct request_data *req;
379 int dns_id, sk, err, offset = protocol_offset(protocol);
384 hdr = (void *)(reply + offset);
385 dns_id = reply[offset] | reply[offset + 1] << 8;
387 DBG("Received %d bytes (id 0x%04x)", reply_len, dns_id);
389 req = find_request(dns_id);
393 DBG("id 0x%04x rcode %d", hdr->id, hdr->rcode);
395 reply[offset] = req->srcid & 0xff;
396 reply[offset + 1] = req->srcid >> 8;
400 if (hdr->rcode == 0 || req->resp == NULL) {
404 req->resp = g_try_malloc(reply_len);
405 if (req->resp == NULL)
408 memcpy(req->resp, reply, reply_len);
409 req->resplen = reply_len;
412 if (hdr->rcode > 0 && req->numresp < req->numserv)
415 if (req->timeout > 0)
416 g_source_remove(req->timeout);
418 request_list = g_slist_remove(request_list, req);
420 if (protocol == IPPROTO_UDP) {
421 sk = g_io_channel_unix_get_fd(udp_listener_channel);
422 err = sendto(sk, req->resp, req->resplen, 0,
423 &req->sa, req->sa_len);
426 err = send(sk, req->resp, req->resplen, 0);
436 static void destroy_server(struct server_data *server)
440 DBG("interface %s server %s", server->interface, server->server);
442 server_list = g_slist_remove(server_list, server);
444 if (server->watch > 0)
445 g_source_remove(server->watch);
447 if (server->timeout > 0)
448 g_source_remove(server->timeout);
450 g_io_channel_unref(server->channel);
452 if (server->protocol == IPPROTO_UDP)
453 connman_info("Removing DNS server %s", server->server);
455 g_free(server->incoming_reply);
456 g_free(server->server);
457 for (list = server->domains; list; list = list->next) {
458 char *domain = list->data;
460 server->domains = g_list_remove(server->domains, domain);
463 g_free(server->interface);
467 static gboolean udp_server_event(GIOChannel *channel, GIOCondition condition,
470 unsigned char buf[4096];
473 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
474 struct server_data *data = user_data;
476 connman_error("Error with UDP server %s", data->server);
481 sk = g_io_channel_unix_get_fd(channel);
483 len = recv(sk, buf, sizeof(buf), 0);
487 err = forward_dns_reply(buf, len, IPPROTO_UDP);
492 static gboolean tcp_server_event(GIOChannel *channel, GIOCondition condition,
496 struct server_data *server = user_data;
498 sk = g_io_channel_unix_get_fd(channel);
502 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
505 DBG("TCP server channel closed");
508 * Discard any partial response which is buffered; better
509 * to get a proper response from a working server.
511 g_free(server->incoming_reply);
512 server->incoming_reply = NULL;
514 for (list = request_list; list; list = list->next) {
515 struct request_data *req = list->data;
516 struct domain_hdr *hdr;
518 if (req->protocol == IPPROTO_UDP)
521 if (req->request == NULL)
525 * If we're not waiting for any further response
526 * from another name server, then we send an error
527 * response to the client.
529 if (req->numserv && --(req->numserv))
532 hdr = (void *) (req->request + 2);
533 hdr->id = req->srcid;
534 send_response(req->client_sk, req->request,
535 req->request_len, NULL, 0, IPPROTO_TCP);
537 request_list = g_slist_remove(request_list, req);
540 destroy_server(server);
545 if ((condition & G_IO_OUT) && !server->connected) {
548 struct server_data *udp_server;
550 udp_server = find_server(server->interface, server->server,
552 if (udp_server != NULL) {
553 for (domains = udp_server->domains; domains;
554 domains = domains->next) {
555 char *dom = domains->data;
557 DBG("Adding domain %s to %s",
558 dom, server->server);
560 server->domains = g_list_append(server->domains,
565 server->connected = TRUE;
566 server_list = g_slist_append(server_list, server);
568 if (server->timeout > 0) {
569 g_source_remove(server->timeout);
573 for (list = request_list; list; list = list->next) {
574 struct request_data *req = list->data;
576 if (req->protocol == IPPROTO_UDP)
579 DBG("Sending req %s over TCP", (char *)req->name);
581 if (req->timeout > 0)
582 g_source_remove(req->timeout);
584 req->timeout = g_timeout_add_seconds(30,
585 request_timeout, req);
586 ns_resolv(server, req, req->request, req->name);
589 } else if (condition & G_IO_IN) {
590 struct partial_reply *reply = server->incoming_reply;
594 unsigned char reply_len_buf[2];
597 bytes_recv = recv(sk, reply_len_buf, 2, MSG_PEEK);
600 } else if (bytes_recv < 0) {
601 if (errno == EAGAIN || errno == EWOULDBLOCK)
604 connman_error("DNS proxy error %s",
607 } else if (bytes_recv < 2)
610 reply_len = reply_len_buf[1] | reply_len_buf[0] << 8;
613 DBG("TCP reply %d bytes", reply_len);
615 reply = g_try_malloc(sizeof(*reply) + reply_len + 2);
619 reply->len = reply_len;
622 server->incoming_reply = reply;
625 while (reply->received < reply->len) {
626 bytes_recv = recv(sk, reply->buf + reply->received,
627 reply->len - reply->received, 0);
629 connman_error("DNS proxy TCP disconnect");
631 } else if (bytes_recv < 0) {
632 if (errno == EAGAIN || errno == EWOULDBLOCK)
635 connman_error("DNS proxy error %s",
639 reply->received += bytes_recv;
642 forward_dns_reply(reply->buf, reply->received, IPPROTO_TCP);
645 server->incoming_reply = NULL;
647 destroy_server(server);
655 static gboolean tcp_idle_timeout(gpointer user_data)
657 struct server_data *server = user_data;
664 destroy_server(server);
669 static struct server_data *create_server(const char *interface,
670 const char *domain, const char *server,
673 struct addrinfo hints, *rp;
674 struct server_data *data;
677 DBG("interface %s server %s", interface, server);
679 memset(&hints, 0, sizeof(hints));
683 hints.ai_socktype = SOCK_DGRAM;
687 hints.ai_socktype = SOCK_STREAM;
693 hints.ai_family = AF_UNSPEC;
694 hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV | AI_NUMERICHOST;
696 ret = getaddrinfo(server, "53", &hints, &rp);
698 connman_error("Failed to parse server %s address: %s\n",
699 server, gai_strerror(ret));
702 /* Do not blindly copy this code elsewhere; it doesn't loop over the
703 results using ->ai_next as it should. That's OK in *this* case
704 because it was a numeric lookup; we *know* there's only one. */
706 sk = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
708 connman_error("Failed to create server %s socket", server);
713 if (interface != NULL) {
714 if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
715 interface, strlen(interface) + 1) < 0) {
716 connman_error("Failed to bind server %s "
725 data = g_try_new0(struct server_data, 1);
727 connman_error("Failed to allocate server %s data", server);
733 data->channel = g_io_channel_unix_new(sk);
734 if (data->channel == NULL) {
735 connman_error("Failed to create server %s channel", server);
742 g_io_channel_set_close_on_unref(data->channel, TRUE);
744 if (protocol == IPPROTO_TCP) {
745 g_io_channel_set_flags(data->channel, G_IO_FLAG_NONBLOCK, NULL);
746 data->watch = g_io_add_watch(data->channel,
747 G_IO_OUT | G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
748 tcp_server_event, data);
749 data->timeout = g_timeout_add_seconds(30, tcp_idle_timeout,
752 data->watch = g_io_add_watch(data->channel,
753 G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
754 udp_server_event, data);
756 data->interface = g_strdup(interface);
758 data->domains = g_list_append(data->domains, g_strdup(domain));
759 data->server = g_strdup(server);
760 data->protocol = protocol;
762 ret = connect(sk, rp->ai_addr, rp->ai_addrlen);
765 if ((protocol == IPPROTO_TCP && errno != EINPROGRESS) ||
766 protocol == IPPROTO_UDP) {
769 connman_error("Failed to connect to server %s", server);
771 g_source_remove(data->watch);
772 if (data->timeout > 0)
773 g_source_remove(data->timeout);
775 g_io_channel_unref(data->channel);
778 g_free(data->server);
779 g_free(data->interface);
780 for (list = data->domains; list; list = list->next) {
781 char *domain = list->data;
783 data->domains = g_list_remove(data->domains,
792 if (protocol == IPPROTO_UDP) {
793 /* Enable new servers by default */
794 data->enabled = TRUE;
795 connman_info("Adding DNS server %s", data->server);
797 server_list = g_slist_append(server_list, data);
805 static gboolean resolv(struct request_data *req,
806 gpointer request, gpointer name)
810 for (list = server_list; list; list = list->next) {
811 struct server_data *data = list->data;
813 DBG("server %s enabled %d", data->server, data->enabled);
815 if (data->enabled == FALSE)
818 if (data->watch == 0 && data->protocol == IPPROTO_UDP)
819 data->watch = g_io_add_watch(data->channel,
820 G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
821 udp_server_event, data);
823 if (ns_resolv(data, req, request, name) < 0)
830 static void append_domain(const char *interface, const char *domain)
834 DBG("interface %s domain %s", interface, domain);
836 for (list = server_list; list; list = list->next) {
837 struct server_data *data = list->data;
840 gboolean dom_found = FALSE;
842 if (data->interface == NULL)
845 if (g_str_equal(data->interface, interface) == FALSE)
848 for (dom_list = data->domains; dom_list;
849 dom_list = dom_list->next) {
850 dom = dom_list->data;
852 if (g_str_equal(dom, domain)) {
858 if (dom_found == FALSE) {
860 g_list_append(data->domains, g_strdup(domain));
865 static int dnsproxy_append(const char *interface, const char *domain,
868 struct server_data *data;
870 DBG("interface %s server %s", interface, server);
872 if (server == NULL && domain == NULL)
875 if (server == NULL) {
876 append_domain(interface, domain);
881 if (g_str_equal(server, "127.0.0.1") == TRUE)
884 data = find_server(interface, server, IPPROTO_UDP);
886 append_domain(interface, domain);
890 data = create_server(interface, domain, server, IPPROTO_UDP);
897 static void remove_server(const char *interface, const char *domain,
898 const char *server, int protocol)
900 struct server_data *data;
902 data = find_server(interface, server, protocol);
906 destroy_server(data);
909 static int dnsproxy_remove(const char *interface, const char *domain,
912 DBG("interface %s server %s", interface, server);
917 if (g_str_equal(server, "127.0.0.1") == TRUE)
920 remove_server(interface, domain, server, IPPROTO_UDP);
921 remove_server(interface, domain, server, IPPROTO_TCP);
926 static void dnsproxy_flush(void)
930 list = request_pending_list;
932 struct request_data *req = list->data;
936 request_pending_list =
937 g_slist_remove(request_pending_list, req);
938 resolv(req, req->request, req->name);
939 g_free(req->request);
944 static struct connman_resolver dnsproxy_resolver = {
946 .priority = CONNMAN_RESOLVER_PRIORITY_HIGH,
947 .append = dnsproxy_append,
948 .remove = dnsproxy_remove,
949 .flush = dnsproxy_flush,
952 static void dnsproxy_offline_mode(connman_bool_t enabled)
956 DBG("enabled %d", enabled);
958 for (list = server_list; list; list = list->next) {
959 struct server_data *data = list->data;
961 if (enabled == FALSE) {
962 connman_info("Enabling DNS server %s", data->server);
963 data->enabled = TRUE;
965 connman_info("Disabling DNS server %s", data->server);
966 data->enabled = FALSE;
971 static void dnsproxy_default_changed(struct connman_service *service)
976 DBG("service %p", service);
978 if (service == NULL) {
979 /* When no services are active, then disable DNS proxying */
980 dnsproxy_offline_mode(TRUE);
984 interface = connman_service_get_interface(service);
985 if (interface == NULL)
988 for (list = server_list; list; list = list->next) {
989 struct server_data *data = list->data;
991 if (g_strcmp0(data->interface, interface) == 0) {
992 connman_info("Enabling DNS server %s", data->server);
993 data->enabled = TRUE;
995 connman_info("Disabling DNS server %s", data->server);
996 data->enabled = FALSE;
1003 static struct connman_notifier dnsproxy_notifier = {
1005 .default_changed = dnsproxy_default_changed,
1006 .offline_mode = dnsproxy_offline_mode,
1009 static unsigned char opt_edns0_type[2] = { 0x00, 0x29 };
1011 static int parse_request(unsigned char *buf, int len,
1012 char *name, unsigned int size)
1014 struct domain_hdr *hdr = (void *) buf;
1015 uint16_t qdcount = ntohs(hdr->qdcount);
1016 uint16_t arcount = ntohs(hdr->arcount);
1018 char *last_label = NULL;
1019 unsigned int remain, used = 0;
1024 DBG("id 0x%04x qr %d opcode %d qdcount %d arcount %d",
1025 hdr->id, hdr->qr, hdr->opcode,
1028 if (hdr->qr != 0 || qdcount != 1)
1031 memset(name, 0, size);
1033 ptr = buf + sizeof(struct domain_hdr);
1034 remain = len - sizeof(struct domain_hdr);
1036 while (remain > 0) {
1040 last_label = (char *) (ptr + 1);
1044 if (used + len + 1 > size)
1047 strncat(name, (char *) (ptr + 1), len);
1056 if (last_label && arcount && remain >= 9 && last_label[4] == 0 &&
1057 !memcmp(last_label + 5, opt_edns0_type, 2)) {
1058 uint16_t edns0_bufsize;
1060 edns0_bufsize = last_label[7] << 8 | last_label[8];
1062 DBG("EDNS0 buffer size %u", edns0_bufsize);
1064 /* This is an evil hack until full TCP support has been
1067 * Somtimes the EDNS0 request gets send with a too-small
1068 * buffer size. Since glibc doesn't seem to crash when it
1069 * gets a response biffer then it requested, just bump
1070 * the buffer size up to 4KiB.
1072 if (edns0_bufsize < 0x1000) {
1073 last_label[7] = 0x10;
1074 last_label[8] = 0x00;
1078 DBG("query %s", name);
1083 static gboolean tcp_listener_event(GIOChannel *channel, GIOCondition condition,
1086 unsigned char buf[768];
1088 struct request_data *req;
1089 struct server_data *server;
1090 int sk, client_sk, len, err;
1091 struct sockaddr_in6 client_addr;
1092 socklen_t client_addr_len = sizeof(client_addr);
1095 DBG("condition 0x%x", condition);
1097 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
1098 if (tcp_listener_watch > 0)
1099 g_source_remove(tcp_listener_watch);
1100 tcp_listener_watch = 0;
1102 connman_error("Error with TCP listener channel");
1107 sk = g_io_channel_unix_get_fd(channel);
1109 client_sk = accept(sk, (void *)&client_addr, &client_addr_len);
1110 if (client_sk < 0) {
1111 connman_error("Accept failure on TCP listener");
1112 tcp_listener_watch = 0;
1116 len = recv(client_sk, buf, sizeof(buf), 0);
1120 DBG("Received %d bytes (id 0x%04x)", len, buf[2] | buf[3] << 8);
1122 err = parse_request(buf + 2, len - 2, query, sizeof(query));
1123 if (err < 0 || (g_slist_length(server_list) == 0 &&
1124 connman_ondemand_connected())) {
1125 send_response(client_sk, buf, len, NULL, 0, IPPROTO_TCP);
1129 req = g_try_new0(struct request_data, 1);
1133 memcpy(&req->sa, &client_addr, client_addr_len);
1134 req->sa_len = client_addr_len;
1135 req->client_sk = client_sk;
1136 req->protocol = IPPROTO_TCP;
1139 if (request_id == 0x0000 || request_id == 0xffff)
1142 req->srcid = buf[2] | (buf[3] << 8);
1143 req->dstid = request_id;
1144 req->altid = request_id + 1;
1145 req->request_len = len;
1147 buf[2] = req->dstid & 0xff;
1148 buf[3] = req->dstid >> 8;
1151 request_list = g_slist_append(request_list, req);
1153 for (list = server_list; list; list = list->next) {
1154 struct server_data *data = list->data;
1157 if (data->protocol != IPPROTO_UDP || data->enabled == FALSE)
1160 server = create_server(data->interface, NULL,
1161 data->server, IPPROTO_TCP);
1164 * If server is NULL, we're not connected yet.
1165 * Copy the relevant buffers and continue with
1166 * the next nameserver.
1167 * The request will actually be sent once we're
1168 * properly connected over TCP to this nameserver.
1170 if (server == NULL) {
1171 req->request = g_try_malloc0(req->request_len);
1172 if (req->request == NULL)
1175 memcpy(req->request, buf, req->request_len);
1177 req->name = g_try_malloc0(sizeof(query));
1178 if (req->name == NULL) {
1179 g_free(req->request);
1182 memcpy(req->name, query, sizeof(query));
1187 if (req->timeout > 0)
1188 g_source_remove(req->timeout);
1190 for (domains = data->domains; domains;
1191 domains = domains->next) {
1192 char *dom = domains->data;
1194 DBG("Adding domain %s to %s", dom, server->server);
1196 server->domains = g_list_append(server->domains,
1200 req->timeout = g_timeout_add_seconds(30, request_timeout, req);
1201 ns_resolv(server, req, buf, query);
1207 static gboolean udp_listener_event(GIOChannel *channel, GIOCondition condition,
1210 unsigned char buf[768];
1212 struct request_data *req;
1213 struct sockaddr_in6 client_addr;
1214 socklen_t client_addr_len = sizeof(client_addr);
1217 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
1218 connman_error("Error with UDP listener channel");
1219 udp_listener_watch = 0;
1223 sk = g_io_channel_unix_get_fd(channel);
1225 memset(&client_addr, 0, client_addr_len);
1226 len = recvfrom(sk, buf, sizeof(buf), 0, (void *)&client_addr,
1231 DBG("Received %d bytes (id 0x%04x)", len, buf[0] | buf[1] << 8);
1233 err = parse_request(buf, len, query, sizeof(query));
1234 if (err < 0 || (g_slist_length(server_list) == 0 &&
1235 connman_ondemand_connected())) {
1236 send_response(sk, buf, len, (void *)&client_addr,
1237 client_addr_len, IPPROTO_UDP);
1241 req = g_try_new0(struct request_data, 1);
1245 memcpy(&req->sa, &client_addr, client_addr_len);
1246 req->sa_len = client_addr_len;
1248 req->protocol = IPPROTO_UDP;
1251 if (request_id == 0x0000 || request_id == 0xffff)
1254 req->srcid = buf[0] | (buf[1] << 8);
1255 req->dstid = request_id;
1256 req->altid = request_id + 1;
1257 req->request_len = len;
1259 buf[0] = req->dstid & 0xff;
1260 buf[1] = req->dstid >> 8;
1262 if (!connman_ondemand_connected()) {
1263 DBG("Starting on demand connection");
1265 * We're not connected, let's queue the request and start
1266 * an on-demand connection.
1268 req->request = g_try_malloc0(req->request_len);
1269 if (req->request == NULL)
1272 memcpy(req->request, buf, req->request_len);
1274 req->name = g_try_malloc0(sizeof(query));
1275 if (req->name == NULL) {
1276 g_free(req->request);
1279 memcpy(req->name, query, sizeof(query));
1281 request_pending_list = g_slist_append(request_pending_list,
1284 connman_ondemand_start("", 300);
1291 req->timeout = g_timeout_add_seconds(5, request_timeout, req);
1292 request_list = g_slist_append(request_list, req);
1294 return resolv(req, buf, query);
1297 static int create_dns_listener(int protocol)
1299 GIOChannel *channel;
1300 const char *ifname = "lo", *proto;
1303 struct sockaddr_in6 sin6;
1304 struct sockaddr_in sin;
1307 int sk, type, v6only = 0;
1308 int family = AF_INET6;
1327 sk = socket(family, type, protocol);
1328 if (sk < 0 && family == AF_INET6 && errno == EAFNOSUPPORT) {
1329 connman_error("No IPv6 support; DNS proxy listening only on Legacy IP");
1331 sk = socket(family, type, protocol);
1334 connman_error("Failed to create %s listener socket", proto);
1338 if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
1339 ifname, strlen(ifname) + 1) < 0) {
1340 connman_error("Failed to bind %s listener interface", proto);
1344 /* Ensure it accepts Legacy IP connections too */
1345 if (family == AF_INET6 &&
1346 setsockopt(sk, SOL_IPV6, IPV6_V6ONLY,
1347 &v6only, sizeof(v6only)) < 0) {
1348 connman_error("Failed to clear V6ONLY on %s listener socket",
1354 if (family == AF_INET) {
1355 memset(&s.sin, 0, sizeof(s.sin));
1356 s.sin.sin_family = AF_INET;
1357 s.sin.sin_port = htons(53);
1358 s.sin.sin_addr.s_addr = htonl(INADDR_ANY);
1359 slen = sizeof(s.sin);
1361 memset(&s.sin6, 0, sizeof(s.sin6));
1362 s.sin6.sin6_family = AF_INET6;
1363 s.sin6.sin6_port = htons(53);
1364 s.sin6.sin6_addr = in6addr_any;
1365 slen = sizeof(s.sin6);
1368 if (bind(sk, &s.sa, slen) < 0) {
1369 connman_error("Failed to bind %s listener socket", proto);
1374 if (protocol == IPPROTO_TCP && listen(sk, 10) < 0) {
1375 connman_error("Failed to listen on TCP socket");
1380 channel = g_io_channel_unix_new(sk);
1381 if (channel == NULL) {
1382 connman_error("Failed to create %s listener channel", proto);
1387 g_io_channel_set_close_on_unref(channel, TRUE);
1389 if (protocol == IPPROTO_TCP) {
1390 tcp_listener_channel = channel;
1391 tcp_listener_watch = g_io_add_watch(channel,
1392 G_IO_IN, tcp_listener_event, NULL);
1394 udp_listener_channel = channel;
1395 udp_listener_watch = g_io_add_watch(channel,
1396 G_IO_IN, udp_listener_event, NULL);
1402 static void destroy_udp_listener(void)
1406 if (udp_listener_watch > 0)
1407 g_source_remove(udp_listener_watch);
1409 g_io_channel_unref(udp_listener_channel);
1412 static void destroy_tcp_listener(void)
1416 if (tcp_listener_watch > 0)
1417 g_source_remove(tcp_listener_watch);
1419 g_io_channel_unref(tcp_listener_channel);
1422 static int create_listener(void)
1426 err = create_dns_listener(IPPROTO_UDP);
1430 err = create_dns_listener(IPPROTO_TCP);
1432 destroy_udp_listener();
1436 connman_resolver_append("lo", NULL, "127.0.0.1");
1441 static void destroy_listener(void)
1445 connman_resolver_remove_all("lo");
1447 for (list = request_pending_list; list; list = list->next) {
1448 struct request_data *req = list->data;
1450 DBG("Dropping pending request (id 0x%04x -> 0x%04x)",
1451 req->srcid, req->dstid);
1454 g_free(req->request);
1460 g_slist_free(request_pending_list);
1461 request_pending_list = NULL;
1463 for (list = request_list; list; list = list->next) {
1464 struct request_data *req = list->data;
1466 DBG("Dropping request (id 0x%04x -> 0x%04x)",
1467 req->srcid, req->dstid);
1470 g_free(req->request);
1476 g_slist_free(request_list);
1477 request_list = NULL;
1479 destroy_tcp_listener();
1480 destroy_udp_listener();
1483 int __connman_dnsproxy_init(void)
1487 err = create_listener();
1491 err = connman_resolver_register(&dnsproxy_resolver);
1495 err = connman_notifier_register(&dnsproxy_notifier);
1502 connman_resolver_unregister(&dnsproxy_resolver);
1510 void __connman_dnsproxy_cleanup(void)
1512 connman_notifier_unregister(&dnsproxy_notifier);
1514 connman_resolver_unregister(&dnsproxy_resolver);