1 /**
2 * collectd - src/libcollectdclient/network.c
3 * Copyright (C) 2005-2012 Florian octo Forster
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Florian octo Forster <octo at collectd.org>
25 **/
27 #include "collectd.h"
29 #include <stdlib.h>
30 #include <stdio.h>
31 #include <unistd.h>
32 #include <string.h>
33 #include <errno.h>
34 #include <assert.h>
36 #include <sys/types.h>
37 #include <sys/socket.h>
38 #include <netdb.h>
40 #if HAVE_NETINET_IN_H
41 # include <netinet/in.h>
42 #endif
44 #include "collectd/network.h"
45 #include "collectd/network_buffer.h"
47 /*
48 * Private data types
49 */
50 struct lcc_network_s
51 {
52 lcc_server_t *servers;
53 };
55 struct lcc_server_s
56 {
57 char *node;
58 char *service;
60 int ttl;
61 lcc_security_level_t security_level;
62 char *username;
63 char *password;
65 int fd;
66 struct sockaddr *sa;
67 socklen_t sa_len;
69 lcc_network_buffer_t *buffer;
71 lcc_server_t *next;
72 };
74 /*
75 * Private functions
76 */
77 static int server_close_socket (lcc_server_t *srv) /* {{{ */
78 {
79 if (srv == NULL)
80 return (EINVAL);
82 if (srv->fd < 0)
83 return (0);
85 close (srv->fd);
86 free (srv->sa);
87 srv->sa = NULL;
88 srv->sa_len = 0;
90 return (0);
91 } /* }}} int server_close_socket */
93 static void int_server_destroy (lcc_server_t *srv) /* {{{ */
94 {
95 lcc_server_t *next;
97 if (srv == NULL)
98 return;
100 server_close_socket (srv);
102 next = srv->next;
104 if (srv->fd >= 0)
105 {
106 close (srv->fd);
107 srv->fd = -1;
108 }
110 free (srv->node);
111 free (srv->service);
112 free (srv->username);
113 free (srv->password);
114 free (srv);
116 int_server_destroy (next);
117 } /* }}} void int_server_destroy */
119 static int server_open_socket (lcc_server_t *srv) /* {{{ */
120 {
121 struct addrinfo ai_hints = { 0 };
122 struct addrinfo *ai_list = NULL;
123 struct addrinfo *ai_ptr;
124 int status;
126 if (srv == NULL)
127 return (EINVAL);
129 if (srv->fd >= 0)
130 server_close_socket (srv);
132 #ifdef AI_ADDRCONFIG
133 ai_hints.ai_flags |= AI_ADDRCONFIG;
134 #endif
135 ai_hints.ai_family = AF_UNSPEC;
136 ai_hints.ai_socktype = SOCK_DGRAM;
138 status = getaddrinfo (srv->node, srv->service, &ai_hints, &ai_list);
139 if (status != 0)
140 return (status);
141 assert (ai_list != NULL);
143 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
144 {
145 srv->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
146 if (srv->fd < 0)
147 continue;
149 if (ai_ptr->ai_family == AF_INET)
150 {
152 struct sockaddr_in *addr = (struct sockaddr_in *) ai_ptr->ai_addr;
153 int optname;
155 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
156 optname = IP_MULTICAST_TTL;
157 else
158 optname = IP_TTL;
160 setsockopt (srv->fd, IPPROTO_IP, optname,
161 &srv->ttl,
162 sizeof (srv->ttl));
163 }
164 else if (ai_ptr->ai_family == AF_INET6)
165 {
166 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
167 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai_ptr->ai_addr;
168 int optname;
170 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
171 optname = IPV6_MULTICAST_HOPS;
172 else
173 optname = IPV6_UNICAST_HOPS;
175 setsockopt (srv->fd, IPPROTO_IPV6, optname,
176 &srv->ttl,
177 sizeof (srv->ttl));
178 }
180 srv->sa = malloc (ai_ptr->ai_addrlen);
181 if (srv->sa == NULL)
182 {
183 close (srv->fd);
184 srv->fd = -1;
185 continue;
186 }
188 memcpy (srv->sa, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
189 srv->sa_len = ai_ptr->ai_addrlen;
190 break;
191 }
193 freeaddrinfo (ai_list);
195 if (srv->fd < 0)
196 return (-1);
197 return (0);
198 } /* }}} int server_open_socket */
200 static int server_send_buffer (lcc_server_t *srv) /* {{{ */
201 {
202 char buffer[LCC_NETWORK_BUFFER_SIZE_DEFAULT];
203 size_t buffer_size;
204 int status;
206 if (srv->fd < 0)
207 {
208 status = server_open_socket (srv);
209 if (status != 0)
210 return (status);
211 }
213 memset (buffer, 0, sizeof (buffer));
214 buffer_size = sizeof (buffer);
216 lcc_network_buffer_finalize (srv->buffer);
217 status = lcc_network_buffer_get (srv->buffer, buffer, &buffer_size);
218 lcc_network_buffer_initialize (srv->buffer);
220 if (status != 0)
221 return (status);
223 if (buffer_size > sizeof (buffer))
224 buffer_size = sizeof (buffer);
226 while (42)
227 {
228 assert (srv->fd >= 0);
229 assert (srv->sa != NULL);
230 status = (int) sendto (srv->fd, buffer, buffer_size, /* flags = */ 0,
231 srv->sa, srv->sa_len);
232 if ((status < 0) && ((errno == EINTR) || (errno == EAGAIN)))
233 continue;
235 break;
236 }
238 if (status < 0)
239 return (status);
240 return (0);
241 } /* }}} int server_send_buffer */
243 static int server_value_add (lcc_server_t *srv, /* {{{ */
244 const lcc_value_list_t *vl)
245 {
246 int status;
248 status = lcc_network_buffer_add_value (srv->buffer, vl);
249 if (status == 0)
250 return (0);
252 server_send_buffer (srv);
253 return (lcc_network_buffer_add_value (srv->buffer, vl));
254 } /* }}} int server_value_add */
256 /*
257 * Public functions
258 */
259 lcc_network_t *lcc_network_create (void) /* {{{ */
260 {
261 lcc_network_t *net;
263 net = malloc (sizeof (*net));
264 if (net == NULL)
265 return (NULL);
266 memset (net, 0, sizeof (*net));
268 net->servers = NULL;
270 return (net);
271 } /* }}} lcc_network_t *lcc_network_create */
273 void lcc_network_destroy (lcc_network_t *net) /* {{{ */
274 {
275 if (net == NULL)
276 return;
277 int_server_destroy (net->servers);
278 free (net);
279 } /* }}} void lcc_network_destroy */
281 lcc_server_t *lcc_server_create (lcc_network_t *net, /* {{{ */
282 const char *node, const char *service)
283 {
284 lcc_server_t *srv;
286 if ((net == NULL) || (node == NULL))
287 return (NULL);
288 if (service == NULL)
289 service = NET_DEFAULT_PORT;
291 srv = malloc (sizeof (*srv));
292 if (srv == NULL)
293 return (NULL);
294 memset (srv, 0, sizeof (*srv));
296 srv->fd = -1;
297 srv->security_level = NONE;
298 srv->username = NULL;
299 srv->password = NULL;
300 srv->next = NULL;
302 srv->node = strdup (node);
303 if (srv->node == NULL)
304 {
305 free (srv);
306 return (NULL);
307 }
309 srv->service = strdup (service);
310 if (srv->service == NULL)
311 {
312 free (srv->node);
313 free (srv);
314 return (NULL);
315 }
317 srv->buffer = lcc_network_buffer_create (/* size = */ 0);
318 if (srv->buffer == NULL)
319 {
320 free (srv->service);
321 free (srv->node);
322 free (srv);
323 return (NULL);
324 }
326 if (net->servers == NULL)
327 {
328 net->servers = srv;
329 }
330 else
331 {
332 lcc_server_t *last = net->servers;
334 while (last->next != NULL)
335 last = last->next;
337 last->next = srv;
338 }
340 return (srv);
341 } /* }}} lcc_server_t *lcc_server_create */
343 int lcc_server_destroy (lcc_network_t *net, lcc_server_t *srv) /* {{{ */
344 {
345 if ((net == NULL) || (srv == NULL))
346 return (EINVAL);
348 if (net->servers == srv)
349 {
350 net->servers = srv->next;
351 srv->next = NULL;
352 }
353 else
354 {
355 lcc_server_t *prev = net->servers;
357 while ((prev != NULL) && (prev->next != srv))
358 prev = prev->next;
360 if (prev == NULL)
361 return (ENOENT);
363 prev->next = srv->next;
364 srv->next = NULL;
365 }
367 int_server_destroy (srv);
369 return (0);
370 } /* }}} int lcc_server_destroy */
372 int lcc_server_set_ttl (lcc_server_t *srv, uint8_t ttl) /* {{{ */
373 {
374 if (srv == NULL)
375 return (EINVAL);
377 srv->ttl = (int) ttl;
379 return (0);
380 } /* }}} int lcc_server_set_ttl */
382 int lcc_server_set_security_level (lcc_server_t *srv, /* {{{ */
383 lcc_security_level_t level,
384 const char *username, const char *password)
385 {
386 return (lcc_network_buffer_set_security_level (srv->buffer,
387 level, username, password));
388 } /* }}} int lcc_server_set_security_level */
390 int lcc_network_values_send (lcc_network_t *net, /* {{{ */
391 const lcc_value_list_t *vl)
392 {
393 lcc_server_t *srv;
395 if ((net == NULL) || (vl == NULL))
396 return (EINVAL);
398 for (srv = net->servers; srv != NULL; srv = srv->next)
399 server_value_add (srv, vl);
401 return (0);
402 } /* }}} int lcc_network_values_send */
404 /* vim: set sw=2 sts=2 et fdm=marker : */