5 * Copyright (C) 2007-2009 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>
33 #define CONNMAN_API_SUBJECT_TO_CHANGE
34 #include <connman/plugin.h>
35 #include <connman/resolver.h>
36 #include <connman/log.h>
48 struct sockaddr_in sin;
53 static GSList *server_list = NULL;
54 static GSList *request_list = NULL;
56 static GIOChannel *listener_channel = NULL;
57 static guint listener_watch = 0;
59 static struct request_data *find_request(guint16 id)
63 for (list = request_list; list; list = list->next) {
64 struct request_data *data = list->data;
73 static struct server_data *find_server(const char *interface,
78 DBG("interface %s server %s", interface, server);
80 for (list = server_list; list; list = list->next) {
81 struct server_data *data = list->data;
83 if (data->interface == NULL || data->server == NULL)
86 if (g_str_equal(data->interface, interface) == TRUE &&
87 g_str_equal(data->server, server) == TRUE)
94 static gboolean server_event(GIOChannel *channel, GIOCondition condition,
97 struct server_data *data = user_data;
98 struct request_data *req;
99 unsigned char buf[768];
102 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
103 connman_error("Error with server channel");
108 sk = g_io_channel_unix_get_fd(channel);
110 len = recv(sk, buf, sizeof(buf), 0);
114 DBG("Received %d bytes (id 0x%04x)", len, buf[0] | buf[1] << 8);
116 req = find_request(buf[0] | buf[1] << 8);
120 request_list = g_slist_remove(request_list, req);
122 sk = g_io_channel_unix_get_fd(listener_channel);
124 err = sendto(sk, buf, len, 0, (struct sockaddr *) &req->sin, req->len);
131 static struct server_data *create_server(const char *interface,
134 struct server_data *data;
135 struct sockaddr_in sin;
138 DBG("interface %s server %s", interface, server);
140 sk = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
142 connman_error("Failed to create server %s socket", server);
146 if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
147 interface, strlen(interface) + 1) < 0) {
148 connman_error("Failed to bind server %s to interface %s",
154 memset(&sin, 0, sizeof(sin));
155 sin.sin_family = AF_INET;
156 sin.sin_port = htons(53);
157 sin.sin_addr.s_addr = inet_addr(server);
159 if (connect(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
160 connman_error("Failed to connect server %s", server);
165 data = g_try_new0(struct server_data, 1);
167 connman_error("Failed to allocate server %s data", server);
172 data->channel = g_io_channel_unix_new(sk);
173 if (data->channel == NULL) {
174 connman_error("Failed to create server %s channel", server);
180 g_io_channel_set_close_on_unref(data->channel, TRUE);
182 data->watch = g_io_add_watch(data->channel, G_IO_IN,
185 data->interface = g_strdup(interface);
186 data->server = g_strdup(server);
191 static void destroy_server(struct server_data *data)
193 DBG("interface %s server %s", data->interface, data->server);
196 g_source_remove(data->watch);
198 g_io_channel_unref(data->channel);
200 g_free(data->interface);
201 g_free(data->server);
205 static int dnsproxy_append(const char *interface, const char *domain,
208 struct server_data *data;
210 DBG("interface %s server %s", interface, server);
212 if (g_str_equal(server, "127.0.0.1") == TRUE)
215 data = create_server(interface, server);
219 server_list = g_slist_append(server_list, data);
224 static int dnsproxy_remove(const char *interface, const char *domain,
227 struct server_data *data;
229 DBG("interface %s server %s", interface, server);
231 if (g_str_equal(server, "127.0.0.1") == TRUE)
234 data = find_server(interface, server);
238 server_list = g_slist_remove(server_list, data);
240 destroy_server(data);
245 static struct connman_resolver dnsproxy_resolver = {
247 .priority = CONNMAN_RESOLVER_PRIORITY_HIGH,
248 .append = dnsproxy_append,
249 .remove = dnsproxy_remove,
252 #if __BYTE_ORDER == __LITTLE_ENDIAN
267 } __attribute__ ((packed));
268 #elif __BYTE_ORDER == __BIG_ENDIAN
283 } __attribute__ ((packed));
285 #error "Unknown byte order"
288 static void parse_request(unsigned char *buf, int len)
290 struct domain_hdr *hdr = (void *) buf;
291 uint16_t qdcount = ntohs(hdr->qdcount);
294 unsigned int remain, used = 0;
299 DBG("id 0x%04x qr %d opcode %d qdcount %d",
300 hdr->id, hdr->qr, hdr->opcode, qdcount);
302 if (hdr->qr != 0 || qdcount != 1)
305 memset(name, 0, sizeof(name));
316 if (used + len + 1 > sizeof(name))
319 strncat(name, (char *) (ptr + 1), len);
328 DBG("domain name %s", name);
331 static gboolean listener_event(GIOChannel *channel, GIOCondition condition,
335 unsigned char buf[768];
336 struct request_data *req;
337 struct sockaddr_in sin;
338 socklen_t size = sizeof(sin);
341 if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
342 connman_error("Error with listener channel");
347 sk = g_io_channel_unix_get_fd(channel);
349 memset(&sin, 0, sizeof(sin));
350 len = recvfrom(sk, buf, sizeof(buf), 0,
351 (struct sockaddr *) &sin, &size);
355 DBG("Received %d bytes (id 0x%04x)", len, buf[0] | buf[1] << 8);
357 parse_request(buf, len);
359 if (g_slist_length(server_list) == 0)
362 req = find_request(buf[0] | (buf[1] << 8));
364 req = g_try_new0(struct request_data, 1);
368 memcpy(&req->sin, &sin, sizeof(sin));
370 req->id = buf[0] | (buf[1] << 8);
372 request_list = g_slist_append(request_list, req);
374 memcpy(&req->sin, &sin, sizeof(sin));
378 for (list = server_list; list; list = list->next) {
379 struct server_data *data = list->data;
381 sk = g_io_channel_unix_get_fd(data->channel);
383 err = send(sk, buf, len, 0);
389 static int create_listener(void)
391 const char *ifname = "lo";
392 struct sockaddr_in sin;
397 sk = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
399 connman_error("Failed to create listener socket");
403 //setsockopt(sk, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
404 //setsockopt(sk, SOL_IP, IP_PKTINFO, &opt, sizeof(opt));
406 if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
407 ifname, strlen(ifname) + 1) < 0) {
408 connman_error("Failed to bind listener interface");
413 memset(&sin, 0, sizeof(sin));
414 sin.sin_family = AF_INET;
415 sin.sin_port = htons(53);
416 sin.sin_addr.s_addr = inet_addr("127.0.0.1");
417 //sin.sin_addr.s_addr = INADDR_ANY;
419 if (bind(sk, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
420 connman_error("Failed to bind listener socket");
425 listener_channel = g_io_channel_unix_new(sk);
426 if (listener_channel == NULL) {
427 connman_error("Failed to create listener channel");
432 g_io_channel_set_close_on_unref(listener_channel, TRUE);
434 listener_watch = g_io_add_watch(listener_channel, G_IO_IN,
435 listener_event, NULL);
437 connman_resolver_append("lo", NULL, "127.0.0.1");
442 static void destroy_listener(void)
448 connman_resolver_remove_all("lo");
450 if (listener_watch > 0)
451 g_source_remove(listener_watch);
453 for (list = request_list; list; list = list->next) {
454 struct request_data *data = list->data;
456 DBG("Dropping request (id 0x%04x)", data->id);
462 g_slist_free(request_list);
465 g_io_channel_unref(listener_channel);
468 static int dnsproxy_init(void)
472 err = create_listener();
476 err = connman_resolver_register(&dnsproxy_resolver);
483 static void dnsproxy_exit(void)
487 connman_resolver_unregister(&dnsproxy_resolver);
490 CONNMAN_PLUGIN_DEFINE(dnsproxy, "DNS proxy resolver plugin", VERSION,
491 CONNMAN_PLUGIN_PRIORITY_DEFAULT, dnsproxy_init, dnsproxy_exit)