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
27 #include <sys/socket.h>
36 #include <avahi-core/llist.h>
38 #include "simple-protocol.h"
41 #define BUFFER_SIZE (10*1024)
43 #define UNIX_SOCKET_PATH "/tmp/avahi"
44 #define UNIX_SOCKET UNIX_SOCKET_PATH"/socket"
46 #define CLIENTS_MAX 50
48 typedef struct Client Client;
49 typedef struct Server Server;
53 CLIENT_RESOLVE_HOSTNAME,
54 CLIENT_RESOLVE_ADDRESS,
66 gchar inbuf[BUFFER_SIZE], outbuf[BUFFER_SIZE];
67 guint inbuf_length, outbuf_length;
69 AvahiHostNameResolver *host_name_resolver;
70 AvahiAddressResolver *address_resolver;
72 AVAHI_LLIST_FIELDS(Client, clients);
77 GMainContext *context;
80 AVAHI_LLIST_HEAD(Client, clients);
85 static Server *server = NULL;
87 static void client_free(Client *c) {
90 g_assert(c->server->n_clients >= 1);
91 c->server->n_clients--;
93 if (c->host_name_resolver)
94 avahi_host_name_resolver_free(c->host_name_resolver);
96 if (c->address_resolver)
97 avahi_address_resolver_free(c->address_resolver);
99 g_source_remove_poll(&c->server->source, &c->poll_fd);
101 AVAHI_LLIST_REMOVE(Client, clients, c->server->clients, c);
105 static void client_new(Server *s, int fd) {
110 c = g_new(Client, 1);
113 c->state = CLIENT_IDLE;
115 c->inbuf_length = c->outbuf_length = 0;
117 c->host_name_resolver = NULL;
118 c->address_resolver = NULL;
120 memset(&c->poll_fd, 0, sizeof(GPollFD));
122 c->poll_fd.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
123 g_source_add_poll(&s->source, &c->poll_fd);
125 AVAHI_LLIST_PREPEND(Client, clients, s->clients, c);
129 static void client_output(Client *c, const guint8*data, guint size) {
138 k = sizeof(c->outbuf) - c->outbuf_length;
139 m = size > k ? k : size;
141 memcpy(c->outbuf + c->outbuf_length, data, m);
142 c->outbuf_length += m;
144 c->poll_fd.events |= G_IO_OUT;
147 static void client_output_printf(Client *c, gchar *format, ...) {
151 va_start(ap, format);
152 vsnprintf(txt, sizeof(txt), format, ap);
155 client_output(c, (guint8*) txt, strlen(txt));
158 static void host_name_resolver_callback(AvahiHostNameResolver *r, gint iface, guchar protocol, AvahiBrowserEvent event, const gchar *hostname, const AvahiAddress *a, gpointer userdata) {
159 Client *c = userdata;
164 if (event == AVAHI_RESOLVER_TIMEOUT)
165 client_output_printf(c, "- Query timed out\n");
168 avahi_address_snprint(t, sizeof(t), a);
169 client_output_printf(c, "+ %s\n", t);
172 c->state = CLIENT_DEAD;
175 static void address_resolver_callback(AvahiAddressResolver *r, gint iface, guchar protocol, AvahiBrowserEvent event, const AvahiAddress *a, const gchar *hostname, gpointer userdata) {
176 Client *c = userdata;
180 if (event == AVAHI_RESOLVER_TIMEOUT)
181 client_output_printf(c, "- Query timed out\n");
183 client_output_printf(c, "+ %s\n", hostname);
185 c->state = CLIENT_DEAD;
188 static void handle_line(Client *c, const gchar *s) {
189 gchar cmd[64], arg[64];
195 if (c->state != CLIENT_IDLE)
198 if ((n_args = sscanf(s, "%63s %63s", cmd, arg)) < 1 ) {
199 client_output_printf(c, "- Failed to parse command, try \"HELP\".\n");
200 c->state = CLIENT_DEAD;
204 if (strcmp(cmd, "HELP") == 0) {
205 client_output_printf(c,
206 "+ Available commands are:\n"
207 "+ RESOLVE-HOSTNAME <hostname>\n"
208 "+ RESOLVE-HOSTNAME-IPV6 <hostname>\n"
209 "+ RESOLVE-HOSTNAME-IPV4 <hostname>\n"
210 "+ RESOLVE-ADDRESS <address>\n");
211 c->state = CLIENT_DEAD; }
212 else if (strcmp(cmd, "FUCK") == 0 && n_args == 1) {
213 client_output_printf(c, "FUCK: Go fuck yourself!\n");
214 c->state = CLIENT_DEAD;
215 } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV4") == 0 && n_args == 2) {
216 c->state = CLIENT_RESOLVE_HOSTNAME;
217 c->host_name_resolver = avahi_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, AF_INET, host_name_resolver_callback, c);
218 } else if (strcmp(cmd, "RESOLVE-HOSTNAME-IPV6") == 0 && n_args == 2) {
219 c->state = CLIENT_RESOLVE_HOSTNAME;
220 c->host_name_resolver = avahi_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, AF_INET6, host_name_resolver_callback, c);
221 } else if (strcmp(cmd, "RESOLVE-HOSTNAME") == 0 && n_args == 2) {
222 c->state = CLIENT_RESOLVE_HOSTNAME;
223 c->host_name_resolver = avahi_host_name_resolver_new(avahi_server, -1, AF_UNSPEC, arg, AF_UNSPEC, host_name_resolver_callback, c);
224 } else if (strcmp(cmd, "RESOLVE-ADDRESS") == 0 && n_args == 2) {
227 if (!(avahi_address_parse(arg, AF_UNSPEC, &addr))) {
228 client_output_printf(c, "- Failed to parse address \"%s\".\n", arg);
229 c->state = CLIENT_DEAD;
231 c->state = CLIENT_RESOLVE_ADDRESS;
232 c->address_resolver = avahi_address_resolver_new(avahi_server, -1, AF_UNSPEC, &addr, address_resolver_callback, c);
235 client_output_printf(c, "- Invalid command \"%s\", try \"HELP\".\n", cmd);
236 c->state = CLIENT_DEAD;
240 static void handle_input(Client *c) {
247 if (!(e = memchr(c->inbuf, '\n', c->inbuf_length)))
250 k = e - (gchar*) c->inbuf;
253 handle_line(c, c->inbuf);
254 c->inbuf_length -= k + 1;
255 memmove(c->inbuf, e+1, c->inbuf_length);
259 static void client_work(Client *c) {
262 if ((c->poll_fd.revents & G_IO_IN) && c->inbuf_length < sizeof(c->inbuf)) {
265 if ((r = read(c->fd, c->inbuf + c->inbuf_length, sizeof(c->inbuf) - c->inbuf_length)) <= 0) {
267 g_warning("read(): %s", strerror(errno));
272 c->inbuf_length += r;
273 g_assert(c->inbuf_length <= sizeof(c->inbuf));
278 if ((c->poll_fd.revents & G_IO_OUT) && c->outbuf_length > 0) {
281 if ((r = write(c->fd, c->outbuf, c->outbuf_length)) < 0) {
282 g_warning("write(): %s", strerror(errno));
287 g_assert((guint) r <= c->outbuf_length);
288 c->outbuf_length -= r;
290 if (c->outbuf_length)
291 memmove(c->outbuf, c->outbuf + r, c->outbuf_length - r);
293 if (c->outbuf_length == 0 && c->state == CLIENT_DEAD) {
302 (c->outbuf_length > 0 ? G_IO_OUT : 0) |
303 (c->inbuf_length < sizeof(c->inbuf) ? G_IO_IN : 0);
306 static gboolean prepare_func(GSource *source, gint *timeout) {
314 static gboolean check_func(GSource *source) {
315 Server *s = (Server*) source;
320 if (s->poll_fd.revents)
323 for (c = s->clients; c; c = c->clients_next)
324 if (c->poll_fd.revents)
330 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer user_data) {
331 Server *s = (Server*) source;
336 if (s->poll_fd.revents & G_IO_IN) {
339 if ((fd = accept(s->fd, NULL, NULL)) < 0)
340 g_warning("accept(): %s", strerror(errno));
343 } else if (s->poll_fd.revents)
344 g_error("Invalid revents");
346 for (c = s->clients; c; c = n) {
348 if (c->poll_fd.revents)
355 int simple_protocol_setup(GMainContext *c) {
356 struct sockaddr_un sa;
359 static GSourceFuncs source_funcs = {
370 server = (Server*) g_source_new(&source_funcs, sizeof(Server));
372 AVAHI_LLIST_HEAD_INIT(Client, server->clients);
374 g_main_context_ref(server->context = c);
376 server->context = g_main_context_default();
377 server->clients = NULL;
381 if (mkdir(UNIX_SOCKET_PATH, 0755) < 0 && errno != EEXIST) {
382 g_warning("mkdir(): %s", strerror(errno));
386 if ((server->fd = socket(PF_LOCAL, SOCK_STREAM, 0)) < 0) {
387 g_warning("socket(PF_LOCAL, SOCK_STREAM, 0): %s", strerror(errno));
391 memset(&sa, 0, sizeof(sa));
392 sa.sun_family = AF_LOCAL;
393 strncpy(sa.sun_path, UNIX_SOCKET, sizeof(sa.sun_path)-1);
395 if (bind(server->fd, &sa, sizeof(sa)) < 0) {
396 g_warning("bind(): %s", strerror(errno));
400 if (listen(server->fd, 2) < 0) {
401 g_warning("listen(): %s", strerror(errno));
407 memset(&server->poll_fd, 0, sizeof(GPollFD));
408 server->poll_fd.fd = server->fd;
409 server->poll_fd.events = G_IO_IN|G_IO_ERR;
410 g_source_add_poll(&server->source, &server->poll_fd);
412 g_source_attach(&server->source, server->context);
419 simple_protocol_shutdown();
424 void simple_protocol_shutdown(void) {
428 while (server->clients)
429 client_free(server->clients);
431 if (server->fd >= 0) {
432 unlink(UNIX_SOCKET_PATH);
436 g_main_context_unref(server->context);
437 g_source_destroy(&server->source);
438 g_source_unref(&server->source);