1 /**
2 * collectd - src/libcollectdclient/network.c
3 * Copyright (C) 2005-2015 Florian Forster
4 * Copyright (C) 2010 Max Henkel
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *
24 * Authors:
25 * Florian Forster <octo at collectd.org>
26 * Max Henkel <henkel at gmx.at>
27 **/
29 #include "collectd.h"
31 #include <stdlib.h>
32 #include <stdio.h>
33 #include <unistd.h>
34 #include <string.h>
35 #include <errno.h>
36 #include <assert.h>
38 #include <sys/types.h>
39 #include <sys/socket.h>
40 #include <netdb.h>
42 #if HAVE_NETINET_IN_H
43 # include <netinet/in.h>
44 #endif
46 #if HAVE_NET_IF_H
47 # include <net/if.h>
48 #endif
50 #include "collectd/network.h"
51 #include "collectd/network_buffer.h"
53 /*
54 * Private data types
55 */
56 struct lcc_network_s
57 {
58 lcc_server_t *servers;
59 };
61 struct lcc_server_s
62 {
63 char *node;
64 char *service;
66 int ttl;
67 lcc_security_level_t security_level;
68 char *username;
69 char *password;
71 int fd;
72 struct sockaddr *sa;
73 socklen_t sa_len;
75 lcc_network_buffer_t *buffer;
77 lcc_server_t *next;
78 };
80 /*
81 * Private functions
82 */
83 static int server_close_socket (lcc_server_t *srv) /* {{{ */
84 {
85 if (srv == NULL)
86 return (EINVAL);
88 if (srv->fd < 0)
89 return (0);
91 close (srv->fd);
92 srv->fd = -1;
93 free (srv->sa);
94 srv->sa = NULL;
95 srv->sa_len = 0;
97 return (0);
98 } /* }}} int server_close_socket */
100 static void int_server_destroy (lcc_server_t *srv) /* {{{ */
101 {
102 lcc_server_t *next;
104 if (srv == NULL)
105 return;
107 server_close_socket (srv);
109 next = srv->next;
111 free (srv->node);
112 free (srv->service);
113 free (srv->username);
114 free (srv->password);
115 free (srv);
117 int_server_destroy (next);
118 } /* }}} void int_server_destroy */
120 static int server_open_socket (lcc_server_t *srv) /* {{{ */
121 {
122 struct addrinfo *ai_list;
123 int status;
125 if (srv == NULL)
126 return (EINVAL);
128 if (srv->fd >= 0)
129 server_close_socket (srv);
131 struct addrinfo ai_hints = {
132 .ai_family = AF_UNSPEC,
133 .ai_flags = AI_ADDRCONFIG,
134 .ai_socktype = SOCK_DGRAM
135 };
137 status = getaddrinfo (srv->node, srv->service, &ai_hints, &ai_list);
138 if (status != 0)
139 return (status);
140 assert (ai_list != NULL);
142 for (struct addrinfo *ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
143 {
144 srv->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
145 if (srv->fd < 0)
146 continue;
148 if (ai_ptr->ai_family == AF_INET)
149 {
150 struct sockaddr_in *addr = (struct sockaddr_in *) ai_ptr->ai_addr;
151 int optname;
153 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
154 optname = IP_MULTICAST_TTL;
155 else
156 optname = IP_TTL;
158 status = setsockopt (srv->fd, IPPROTO_IP, optname,
159 &srv->ttl, sizeof (srv->ttl));
160 }
161 else if (ai_ptr->ai_family == AF_INET6)
162 {
163 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
164 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai_ptr->ai_addr;
165 int optname;
167 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
168 optname = IPV6_MULTICAST_HOPS;
169 else
170 optname = IPV6_UNICAST_HOPS;
172 status = setsockopt (srv->fd, IPPROTO_IPV6, optname,
173 &srv->ttl, sizeof (srv->ttl));
174 }
175 if (status != 0)
176 {
177 /* setsockopt failed. */
178 close (srv->fd);
179 srv->fd = -1;
180 continue;
181 }
183 srv->sa = malloc (ai_ptr->ai_addrlen);
184 if (srv->sa == NULL)
185 {
186 close (srv->fd);
187 srv->fd = -1;
188 continue;
189 }
191 memcpy (srv->sa, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
192 srv->sa_len = ai_ptr->ai_addrlen;
193 break;
194 }
196 freeaddrinfo (ai_list);
198 if (srv->fd < 0)
199 return (-1);
200 return (0);
201 } /* }}} int server_open_socket */
203 static int server_send_buffer (lcc_server_t *srv) /* {{{ */
204 {
205 char buffer[LCC_NETWORK_BUFFER_SIZE_DEFAULT] = { 0 };
206 size_t buffer_size;
207 int status;
209 if (srv->fd < 0)
210 {
211 status = server_open_socket (srv);
212 if (status != 0)
213 return (status);
214 }
216 buffer_size = sizeof (buffer);
218 status = lcc_network_buffer_finalize (srv->buffer);
219 if (status != 0)
220 {
221 lcc_network_buffer_initialize (srv->buffer);
222 return (status);
223 }
225 status = lcc_network_buffer_get (srv->buffer, buffer, &buffer_size);
226 lcc_network_buffer_initialize (srv->buffer);
228 if (status != 0)
229 return (status);
231 if (buffer_size > sizeof (buffer))
232 buffer_size = sizeof (buffer);
234 while (42)
235 {
236 assert (srv->fd >= 0);
237 assert (srv->sa != NULL);
238 status = (int) sendto (srv->fd, buffer, buffer_size, /* flags = */ 0,
239 srv->sa, srv->sa_len);
240 if ((status < 0) && ((errno == EINTR) || (errno == EAGAIN)))
241 continue;
243 break;
244 }
246 if (status < 0)
247 return (status);
248 return (0);
249 } /* }}} int server_send_buffer */
251 static int server_value_add (lcc_server_t *srv, /* {{{ */
252 const lcc_value_list_t *vl)
253 {
254 int status;
256 status = lcc_network_buffer_add_value (srv->buffer, vl);
257 if (status == 0)
258 return (0);
260 server_send_buffer (srv);
261 return (lcc_network_buffer_add_value (srv->buffer, vl));
262 } /* }}} int server_value_add */
264 /*
265 * Public functions
266 */
267 lcc_network_t *lcc_network_create (void) /* {{{ */
268 {
269 lcc_network_t *net;
271 net = calloc (1, sizeof (*net));
272 if (net == NULL)
273 return (NULL);
275 net->servers = NULL;
277 return (net);
278 } /* }}} lcc_network_t *lcc_network_create */
280 void lcc_network_destroy (lcc_network_t *net) /* {{{ */
281 {
282 if (net == NULL)
283 return;
284 int_server_destroy (net->servers);
285 free (net);
286 } /* }}} void lcc_network_destroy */
288 lcc_server_t *lcc_server_create (lcc_network_t *net, /* {{{ */
289 const char *node, const char *service)
290 {
291 lcc_server_t *srv;
293 if ((net == NULL) || (node == NULL))
294 return (NULL);
295 if (service == NULL)
296 service = NET_DEFAULT_PORT;
298 srv = calloc (1, sizeof (*srv));
299 if (srv == NULL)
300 return (NULL);
302 srv->fd = -1;
303 srv->security_level = NONE;
304 srv->username = NULL;
305 srv->password = NULL;
306 srv->next = NULL;
308 srv->node = strdup (node);
309 if (srv->node == NULL)
310 {
311 free (srv);
312 return (NULL);
313 }
315 srv->service = strdup (service);
316 if (srv->service == NULL)
317 {
318 free (srv->node);
319 free (srv);
320 return (NULL);
321 }
323 srv->buffer = lcc_network_buffer_create (/* size = */ 0);
324 if (srv->buffer == NULL)
325 {
326 free (srv->service);
327 free (srv->node);
328 free (srv);
329 return (NULL);
330 }
332 if (net->servers == NULL)
333 {
334 net->servers = srv;
335 }
336 else
337 {
338 lcc_server_t *last = net->servers;
340 while (last->next != NULL)
341 last = last->next;
343 last->next = srv;
344 }
346 return (srv);
347 } /* }}} lcc_server_t *lcc_server_create */
349 int lcc_server_destroy (lcc_network_t *net, lcc_server_t *srv) /* {{{ */
350 {
351 if ((net == NULL) || (srv == NULL))
352 return (EINVAL);
354 if (net->servers == srv)
355 {
356 net->servers = srv->next;
357 srv->next = NULL;
358 }
359 else
360 {
361 lcc_server_t *prev = net->servers;
363 while ((prev != NULL) && (prev->next != srv))
364 prev = prev->next;
366 if (prev == NULL)
367 return (ENOENT);
369 prev->next = srv->next;
370 srv->next = NULL;
371 }
373 int_server_destroy (srv);
375 return (0);
376 } /* }}} int lcc_server_destroy */
378 int lcc_server_set_ttl (lcc_server_t *srv, uint8_t ttl) /* {{{ */
379 {
380 if (srv == NULL)
381 return (EINVAL);
383 srv->ttl = (int) ttl;
385 return (0);
386 } /* }}} int lcc_server_set_ttl */
388 int lcc_server_set_interface (lcc_server_t *srv, char const *interface) /* {{{ */
389 {
390 unsigned int if_index;
391 int status;
393 if ((srv == NULL) || (interface == NULL))
394 return (EINVAL);
396 if_index = if_nametoindex (interface);
397 if (if_index == 0)
398 return (ENOENT);
400 /* IPv4 multicast */
401 if (srv->sa->sa_family == AF_INET)
402 {
403 struct sockaddr_in *addr = (struct sockaddr_in *) srv->sa;
405 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
406 {
407 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
408 /* If possible, use the "ip_mreqn" structure which has
409 * an "interface index" member. Using the interface
410 * index is preferred here, because of its similarity
411 * to the way IPv6 handles this. Unfortunately, it
412 * appears not to be portable. */
413 struct ip_mreqn mreq = {
414 .imr_multiaddr.s_addr = addr->sin_addr.s_addr,
415 .imr_address.s_addr = ntohl (INADDR_ANY),
416 .imr_ifindex = (int) if_index
417 };
418 #else
419 struct ip_mreq mreq = {
420 .imr_multiaddr.s_addr = addr->sin_addr.s_addr,
421 .imr_interface.s_addr = ntohl (INADDR_ANY)
422 };
423 #endif
425 status = setsockopt (srv->fd, IPPROTO_IP, IP_MULTICAST_IF,
426 &mreq, sizeof (mreq));
427 if (status != 0)
428 return (status);
430 return (0);
431 }
432 }
434 /* IPv6 multicast */
435 if (srv->sa->sa_family == AF_INET6)
436 {
437 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) srv->sa;
439 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
440 {
441 status = setsockopt (srv->fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
442 &if_index, sizeof (if_index));
443 if (status != 0)
444 return (status);
446 return (0);
447 }
448 }
450 /* else: Not a multicast interface. */
451 #if defined(SO_BINDTODEVICE)
452 status = setsockopt (srv->fd, SOL_SOCKET, SO_BINDTODEVICE, interface,
453 (socklen_t) (strlen (interface) + 1));
454 if (status != 0)
455 return (-1);
456 #endif
458 return (0);
459 } /* }}} int lcc_server_set_interface */
461 int lcc_server_set_security_level (lcc_server_t *srv, /* {{{ */
462 lcc_security_level_t level,
463 const char *username, const char *password)
464 {
465 return (lcc_network_buffer_set_security_level (srv->buffer,
466 level, username, password));
467 } /* }}} int lcc_server_set_security_level */
469 int lcc_network_values_send (lcc_network_t *net, /* {{{ */
470 const lcc_value_list_t *vl)
471 {
472 if ((net == NULL) || (vl == NULL))
473 return (EINVAL);
475 for (lcc_server_t *srv = net->servers; srv != NULL; srv = srv->next)
476 server_value_add (srv, vl);
478 return (0);
479 } /* }}} int lcc_network_values_send */
481 /* vim: set sw=2 sts=2 et fdm=marker : */