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 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 struct addrinfo ai_hints = {
133 .ai_family = AF_UNSPEC,
134 .ai_flags = AI_ADDRCONFIG,
135 .ai_socktype = SOCK_DGRAM
136 };
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 {
151 struct sockaddr_in *addr = (struct sockaddr_in *) ai_ptr->ai_addr;
152 int optname;
154 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
155 optname = IP_MULTICAST_TTL;
156 else
157 optname = IP_TTL;
159 status = setsockopt (srv->fd, IPPROTO_IP, optname,
160 &srv->ttl, sizeof (srv->ttl));
161 }
162 else if (ai_ptr->ai_family == AF_INET6)
163 {
164 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
165 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai_ptr->ai_addr;
166 int optname;
168 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
169 optname = IPV6_MULTICAST_HOPS;
170 else
171 optname = IPV6_UNICAST_HOPS;
173 status = setsockopt (srv->fd, IPPROTO_IPV6, optname,
174 &srv->ttl, sizeof (srv->ttl));
175 }
176 if (status != 0)
177 {
178 /* setsockopt failed. */
179 close (srv->fd);
180 srv->fd = -1;
181 continue;
182 }
184 srv->sa = malloc (ai_ptr->ai_addrlen);
185 if (srv->sa == NULL)
186 {
187 close (srv->fd);
188 srv->fd = -1;
189 continue;
190 }
192 memcpy (srv->sa, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
193 srv->sa_len = ai_ptr->ai_addrlen;
194 break;
195 }
197 freeaddrinfo (ai_list);
199 if (srv->fd < 0)
200 return (-1);
201 return (0);
202 } /* }}} int server_open_socket */
204 static int server_send_buffer (lcc_server_t *srv) /* {{{ */
205 {
206 char buffer[LCC_NETWORK_BUFFER_SIZE_DEFAULT] = { 0 };
207 size_t buffer_size;
208 int status;
210 if (srv->fd < 0)
211 {
212 status = server_open_socket (srv);
213 if (status != 0)
214 return (status);
215 }
217 buffer_size = sizeof (buffer);
219 status = lcc_network_buffer_finalize (srv->buffer);
220 if (status != 0)
221 {
222 lcc_network_buffer_initialize (srv->buffer);
223 return (status);
224 }
226 status = lcc_network_buffer_get (srv->buffer, buffer, &buffer_size);
227 lcc_network_buffer_initialize (srv->buffer);
229 if (status != 0)
230 return (status);
232 if (buffer_size > sizeof (buffer))
233 buffer_size = sizeof (buffer);
235 while (42)
236 {
237 assert (srv->fd >= 0);
238 assert (srv->sa != NULL);
239 status = (int) sendto (srv->fd, buffer, buffer_size, /* flags = */ 0,
240 srv->sa, srv->sa_len);
241 if ((status < 0) && ((errno == EINTR) || (errno == EAGAIN)))
242 continue;
244 break;
245 }
247 if (status < 0)
248 return (status);
249 return (0);
250 } /* }}} int server_send_buffer */
252 static int server_value_add (lcc_server_t *srv, /* {{{ */
253 const lcc_value_list_t *vl)
254 {
255 int status;
257 status = lcc_network_buffer_add_value (srv->buffer, vl);
258 if (status == 0)
259 return (0);
261 server_send_buffer (srv);
262 return (lcc_network_buffer_add_value (srv->buffer, vl));
263 } /* }}} int server_value_add */
265 /*
266 * Public functions
267 */
268 lcc_network_t *lcc_network_create (void) /* {{{ */
269 {
270 lcc_network_t *net;
272 net = calloc (1, sizeof (*net));
273 if (net == NULL)
274 return (NULL);
276 net->servers = NULL;
278 return (net);
279 } /* }}} lcc_network_t *lcc_network_create */
281 void lcc_network_destroy (lcc_network_t *net) /* {{{ */
282 {
283 if (net == NULL)
284 return;
285 int_server_destroy (net->servers);
286 free (net);
287 } /* }}} void lcc_network_destroy */
289 lcc_server_t *lcc_server_create (lcc_network_t *net, /* {{{ */
290 const char *node, const char *service)
291 {
292 lcc_server_t *srv;
294 if ((net == NULL) || (node == NULL))
295 return (NULL);
296 if (service == NULL)
297 service = NET_DEFAULT_PORT;
299 srv = calloc (1, sizeof (*srv));
300 if (srv == NULL)
301 return (NULL);
303 srv->fd = -1;
304 srv->security_level = NONE;
305 srv->username = NULL;
306 srv->password = NULL;
307 srv->next = NULL;
309 srv->node = strdup (node);
310 if (srv->node == NULL)
311 {
312 free (srv);
313 return (NULL);
314 }
316 srv->service = strdup (service);
317 if (srv->service == NULL)
318 {
319 free (srv->node);
320 free (srv);
321 return (NULL);
322 }
324 srv->buffer = lcc_network_buffer_create (/* size = */ 0);
325 if (srv->buffer == NULL)
326 {
327 free (srv->service);
328 free (srv->node);
329 free (srv);
330 return (NULL);
331 }
333 if (net->servers == NULL)
334 {
335 net->servers = srv;
336 }
337 else
338 {
339 lcc_server_t *last = net->servers;
341 while (last->next != NULL)
342 last = last->next;
344 last->next = srv;
345 }
347 return (srv);
348 } /* }}} lcc_server_t *lcc_server_create */
350 int lcc_server_destroy (lcc_network_t *net, lcc_server_t *srv) /* {{{ */
351 {
352 if ((net == NULL) || (srv == NULL))
353 return (EINVAL);
355 if (net->servers == srv)
356 {
357 net->servers = srv->next;
358 srv->next = NULL;
359 }
360 else
361 {
362 lcc_server_t *prev = net->servers;
364 while ((prev != NULL) && (prev->next != srv))
365 prev = prev->next;
367 if (prev == NULL)
368 return (ENOENT);
370 prev->next = srv->next;
371 srv->next = NULL;
372 }
374 int_server_destroy (srv);
376 return (0);
377 } /* }}} int lcc_server_destroy */
379 int lcc_server_set_ttl (lcc_server_t *srv, uint8_t ttl) /* {{{ */
380 {
381 if (srv == NULL)
382 return (EINVAL);
384 srv->ttl = (int) ttl;
386 return (0);
387 } /* }}} int lcc_server_set_ttl */
389 int lcc_server_set_interface (lcc_server_t *srv, char const *interface) /* {{{ */
390 {
391 unsigned int if_index;
392 int status;
394 if ((srv == NULL) || (interface == NULL))
395 return (EINVAL);
397 if_index = if_nametoindex (interface);
398 if (if_index == 0)
399 return (ENOENT);
401 /* IPv4 multicast */
402 if (srv->sa->sa_family == AF_INET)
403 {
404 struct sockaddr_in *addr = (struct sockaddr_in *) srv->sa;
406 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
407 {
408 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
409 /* If possible, use the "ip_mreqn" structure which has
410 * an "interface index" member. Using the interface
411 * index is preferred here, because of its similarity
412 * to the way IPv6 handles this. Unfortunately, it
413 * appears not to be portable. */
414 struct ip_mreqn mreq = {
415 .imr_multiaddr.s_addr = addr->sin_addr.s_addr,
416 .imr_address.s_addr = ntohl (INADDR_ANY),
417 .imr_ifindex = (int) if_index
418 };
419 #else
420 struct ip_mreq mreq = {
421 .imr_multiaddr.s_addr = addr->sin_addr.s_addr,
422 .imr_interface.s_addr = ntohl (INADDR_ANY)
423 };
424 #endif
426 status = setsockopt (srv->fd, IPPROTO_IP, IP_MULTICAST_IF,
427 &mreq, sizeof (mreq));
428 if (status != 0)
429 return (status);
431 return (0);
432 }
433 }
435 /* IPv6 multicast */
436 if (srv->sa->sa_family == AF_INET6)
437 {
438 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) srv->sa;
440 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
441 {
442 status = setsockopt (srv->fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
443 &if_index, sizeof (if_index));
444 if (status != 0)
445 return (status);
447 return (0);
448 }
449 }
451 /* else: Not a multicast interface. */
452 #if defined(SO_BINDTODEVICE)
453 status = setsockopt (srv->fd, SOL_SOCKET, SO_BINDTODEVICE, interface,
454 (socklen_t) (strlen (interface) + 1));
455 if (status != 0)
456 return (-1);
457 #endif
459 return (0);
460 } /* }}} int lcc_server_set_interface */
462 int lcc_server_set_security_level (lcc_server_t *srv, /* {{{ */
463 lcc_security_level_t level,
464 const char *username, const char *password)
465 {
466 return (lcc_network_buffer_set_security_level (srv->buffer,
467 level, username, password));
468 } /* }}} int lcc_server_set_security_level */
470 int lcc_network_values_send (lcc_network_t *net, /* {{{ */
471 const lcc_value_list_t *vl)
472 {
473 lcc_server_t *srv;
475 if ((net == NULL) || (vl == NULL))
476 return (EINVAL);
478 for (srv = net->servers; srv != NULL; srv = srv->next)
479 server_value_add (srv, vl);
481 return (0);
482 } /* }}} int lcc_network_values_send */
484 /* vim: set sw=2 sts=2 et fdm=marker : */