4 This file is part of avahi.
6 avahi is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 avahi is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
14 Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with avahi; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
28 #include <sys/socket.h>
35 #include <avahi-common/llist.h>
36 #include <avahi-common/malloc.h>
37 #include <avahi-core/log.h>
39 #include "simple-protocol.h"
42 #define BUFFER_SIZE (20*1024)
44 #define CLIENTS_MAX 50
46 typedef struct Client Client;
47 typedef struct Server Server;
51 CLIENT_RESOLVE_HOSTNAME,
52 CLIENT_RESOLVE_ADDRESS,
53 CLIENT_BROWSE_DNS_SERVERS,
65 char inbuf[BUFFER_SIZE], outbuf[BUFFER_SIZE];
66 size_t inbuf_length, outbuf_length;
68 AvahiSHostNameResolver *host_name_resolver;
69 AvahiSAddressResolver *address_resolver;
70 AvahiSDNSServerBrowser *dns_server_browser;
72 AvahiProtocol afquery;
74 AVAHI_LLIST_FIELDS(Client, clients);
78 const AvahiPoll *poll_api;
81 AVAHI_LLIST_HEAD(Client, clients);
87 static Server *server = NULL;
89 static void client_work(AvahiWatch *watch, int fd, AvahiWatchEvent events, void *userdata);
91 static void client_free(Client *c) {
94 assert(c->server->n_clients >= 1);
95 c->server->n_clients--;
97 if (c->host_name_resolver)
98 avahi_s_host_name_resolver_free(c->host_name_resolver);
100 if (c->address_resolver)
101 avahi_s_address_resolver_free(c->address_resolver);
103 if (c->dns_server_browser)
104 avahi_s_dns_server_browser_free(c->dns_server_browser);
106 c->server->poll_api->watch_free(c->watch);
109 AVAHI_LLIST_REMOVE(Client, clients, c->server->clients, c);
113 static void client_new(Server *s, int fd) {
118 c = avahi_new(Client, 1);
121 c->state = CLIENT_IDLE;
123 c->inbuf_length = c->outbuf_length = 0;
125 c->host_name_resolver = NULL;
126 c->address_resolver = NULL;
127 c->dns_server_browser = NULL;
129 c->watch = s->poll_api->watch_new(s->poll_api, fd, AVAHI_WATCH_IN, client_work, c);
131 AVAHI_LLIST_PREPEND(Client, clients, s->clients, c);
135 static void client_output(Client *c, const uint8_t*data, size_t size) {
144 k = sizeof(c->outbuf) - c->outbuf_length;
145 m = size > k ? k : size;
147 memcpy(c->outbuf + c->outbuf_length, data, m);
148 c->outbuf_length += m;
150 server->poll_api->watch_update(c->watch, AVAHI_WATCH_OUT);
153 static void client_output_printf(Client *c, const char *format, ...) {
157 va_start(ap, format);
158 t = avahi_strdup_vprintf(format, ap);
161 client_output(c, (uint8_t*) t, strlen(t));
166 static void host_name_resolver_callback(
167 AvahiSHostNameResolver *r,
169 AvahiProtocol protocol,
170 AvahiResolverEvent event,
171 const char *hostname,
172 const AvahiAddress *a,
175 Client *c = userdata;
179 if (event == AVAHI_RESOLVER_TIMEOUT)
180 client_output_printf(c, "%+i Query timed out\n", AVAHI_ERR_TIMEOUT);
183 avahi_address_snprint(t, sizeof(t), a);
184 client_output_printf(c, "+ %i %u %s %s\n", iface, protocol, hostname, t);
187 c->state = CLIENT_DEAD;
190 static void address_resolver_callback(
191 AvahiSAddressResolver *r,
193 AvahiProtocol protocol,
194 AvahiResolverEvent event,
195 const AvahiAddress *a,
196 const char *hostname,
199 Client *c = userdata;
203 if (event == AVAHI_RESOLVER_TIMEOUT)
204 client_output_printf(c, "%+i Query timed out\n", AVAHI_ERR_TIMEOUT);
206 client_output_printf(c, "+ %i %u %s\n", iface, protocol, hostname);
208 c->state = CLIENT_DEAD;
211 static void dns_server_browser_callback(
212 AvahiSDNSServerBrowser *b,
213 AvahiIfIndex interface,
214 AvahiProtocol protocol,
215 AvahiBrowserEvent event,
216 const char *host_name,
217 const AvahiAddress *a,
221 Client *c = userdata;
229 avahi_address_snprint(t, sizeof(t), a);
230 client_output_printf(c, "%c %i %u %s %u\n", event == AVAHI_BROWSER_NEW ? '>' : '<', interface, protocol, t, port);
233 static void handle_line(Client *c, const char *s) {
234 char cmd[64], arg[64];
240 if (c->state != CLIENT_IDLE)
243 if ((n_args = sscanf(s, "%63s %63s", cmd, arg)) < 1 ) {
244 client_output_printf(c, "%+i Failed to parse command, try \"HELP\".\n", AVAHI_ERR_INVALID_OPERATION);
245 c->state = CLIENT_DEAD;
249 if (strcmp(cmd, "HELP") == 0) {
250 client_output_printf(c,
251 "+ Available commands are:\n"
252 "+ RESOLVE-HOSTNAME <hostname>\n"
253 "+ RESOLVE-HOSTNAME-IPV6 <hostname>\n"
254 "+ RESOLVE-HOSTNAME-IPV4 <hostname>\n"
255 "+ RESOLVE-ADDRESS <address>\n"
256 "+ BROWSE-DNS-SERVERS\n"
257 "+ BROWSE-DNS-SERVERS-IPV4\n"
258 "+ BROWSE-DNS-SERVERS-IPV6\n");
259 c->state = CLIENT_DEAD; }
260 else if (strcmp(cmd, "FUCK") == 0 && n_args == 1) {
261 client_output_printf(c, "+ FUCK: Go fuck yourself!\n");
262 c->state = CLIENT_DEAD;
263 } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV4") == 0 && n_args == 2) {
264 c->state = CLIENT_RESOLVE_HOSTNAME;
265 if (!(c->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, c->afquery = AF_INET, host_name_resolver_callback, c)))
267 } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV6") == 0 && n_args == 2) {
268 c->state = CLIENT_RESOLVE_HOSTNAME;
269 if (!(c->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, c->afquery = AF_INET6, host_name_resolver_callback, c)))
271 } else if (strcmp(cmd, "RESOLVE-HOSTNAME") == 0 && n_args == 2) {
272 c->state = CLIENT_RESOLVE_HOSTNAME;
273 if (!(c->host_name_resolver = avahi_s_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, c->afquery = AF_UNSPEC, host_name_resolver_callback, c)))
275 } else if (strcmp(cmd, "RESOLVE-ADDRESS") == 0 && n_args == 2) {
278 if (!(avahi_address_parse(arg, AF_UNSPEC, &addr))) {
279 client_output_printf(c, "%+i Failed to parse address \"%s\".\n", AVAHI_ERR_INVALID_ADDRESS, arg);
280 c->state = CLIENT_DEAD;
282 c->state = CLIENT_RESOLVE_ADDRESS;
283 if (!(c->address_resolver = avahi_s_address_resolver_new(avahi_server, -1, AF_UNSPEC, &addr, address_resolver_callback, c)))
286 } else if (strcmp(cmd, "BROWSE-DNS-SERVERS-IPV4") == 0 && n_args == 1) {
287 c->state = CLIENT_BROWSE_DNS_SERVERS;
288 if (!(c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AF_INET, dns_server_browser_callback, c)))
290 client_output_printf(c, "+ Browsing ...\n");
291 } else if (strcmp(cmd, "BROWSE-DNS-SERVERS-IPV6") == 0 && n_args == 1) {
292 c->state = CLIENT_BROWSE_DNS_SERVERS;
293 if (!(c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AF_INET6, dns_server_browser_callback, c)))
295 client_output_printf(c, "+ Browsing ...\n");
296 } else if (strcmp(cmd, "BROWSE-DNS-SERVERS") == 0 && n_args == 1) {
297 c->state = CLIENT_BROWSE_DNS_SERVERS;
298 if (!(c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery = AF_UNSPEC, dns_server_browser_callback, c)))
300 client_output_printf(c, "+ Browsing ...\n");
302 client_output_printf(c, "%+i Invalid command \"%s\", try \"HELP\".\n", AVAHI_ERR_INVALID_OPERATION, cmd);
303 c->state = CLIENT_DEAD;
309 client_output_printf(c, "%+i %s\n", avahi_server_errno(avahi_server), avahi_strerror(avahi_server_errno(avahi_server)));
310 c->state = CLIENT_DEAD;
313 static void handle_input(Client *c) {
320 if (!(e = memchr(c->inbuf, '\n', c->inbuf_length)))
323 k = e - (char*) c->inbuf;
326 handle_line(c, c->inbuf);
327 c->inbuf_length -= k + 1;
328 memmove(c->inbuf, e+1, c->inbuf_length);
332 static void client_work(AvahiWatch *watch, int fd, AvahiWatchEvent events, void *userdata) {
333 Client *c = userdata;
337 if ((events & AVAHI_WATCH_IN) && c->inbuf_length < sizeof(c->inbuf)) {
340 if ((r = read(c->fd, c->inbuf + c->inbuf_length, sizeof(c->inbuf) - c->inbuf_length)) <= 0) {
342 avahi_log_warn("read(): %s", strerror(errno));
347 c->inbuf_length += r;
348 assert(c->inbuf_length <= sizeof(c->inbuf));
353 if ((events & AVAHI_WATCH_OUT) && c->outbuf_length > 0) {
356 if ((r = write(c->fd, c->outbuf, c->outbuf_length)) < 0) {
357 avahi_log_warn("write(): %s", strerror(errno));
362 assert((size_t) r <= c->outbuf_length);
363 c->outbuf_length -= r;
365 if (c->outbuf_length)
366 memmove(c->outbuf, c->outbuf + r, c->outbuf_length - r);
368 if (c->outbuf_length == 0 && c->state == CLIENT_DEAD) {
374 c->server->poll_api->watch_update(
376 (c->outbuf_length > 0 ? AVAHI_WATCH_OUT : 0) |
377 (c->inbuf_length < sizeof(c->inbuf) ? AVAHI_WATCH_IN : 0));
380 static void server_work(AvahiWatch *watch, int fd, AvahiWatchEvent events, void *userdata) {
381 Server *s = userdata;
385 if (events & AVAHI_WATCH_IN) {
388 if ((cfd = accept(fd, NULL, NULL)) < 0)
389 avahi_log_error("accept(): %s", strerror(errno));
395 int simple_protocol_setup(const AvahiPoll *poll_api) {
396 struct sockaddr_un sa;
401 server = avahi_new(Server, 1);
402 server->poll_api = poll_api;
403 server->bind_successful = 0;
405 AVAHI_LLIST_HEAD_INIT(Client, server->clients);
406 server->watch = NULL;
410 if ((server->fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
411 avahi_log_warn("socket(PF_LOCAL, SOCK_STREAM, 0): %s", strerror(errno));
415 memset(&sa, 0, sizeof(sa));
416 sa.sun_family = AF_LOCAL;
417 strncpy(sa.sun_path, AVAHI_SOCKET, sizeof(sa.sun_path)-1);
419 /* We simply remove existing UNIX sockets under this name. The
420 Avahi daemons makes sure that it runs only once on a host,
421 therefore sockets that already exist are stale and may be
422 removed without any ill effects */
424 unlink(AVAHI_SOCKET);
426 if (bind(server->fd, &sa, sizeof(sa)) < 0) {
427 avahi_log_warn("bind(): %s", strerror(errno));
431 server->bind_successful = 1;
433 if (listen(server->fd, 2) < 0) {
434 avahi_log_warn("listen(): %s", strerror(errno));
440 server->watch = poll_api->watch_new(poll_api, server->fd, AVAHI_WATCH_IN, server_work, server);
447 simple_protocol_shutdown();
452 void simple_protocol_shutdown(void) {
456 if (server->bind_successful)
457 unlink(AVAHI_SOCKET);
459 while (server->clients)
460 client_free(server->clients);
463 server->poll_api->watch_free(server->watch);
474 void simple_protocol_restart_queries(void) {
477 /* Restart queries in case of local domain name changes */
481 for (c = server->clients; c; c = c->clients_next)
482 if (c->state == CLIENT_BROWSE_DNS_SERVERS && c->dns_server_browser) {
483 avahi_s_dns_server_browser_free(c->dns_server_browser);
484 c->dns_server_browser = avahi_s_dns_server_browser_new(avahi_server, -1, AF_UNSPEC, NULL, AVAHI_DNS_SERVER_RESOLVE, c->afquery, dns_server_browser_callback, c);