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_hints = { 0 };
123 struct addrinfo *ai_list = NULL;
124 struct addrinfo *ai_ptr;
125 int status;
127 if (srv == NULL)
128 return (EINVAL);
130 if (srv->fd >= 0)
131 server_close_socket (srv);
133 #ifdef AI_ADDRCONFIG
134 ai_hints.ai_flags |= AI_ADDRCONFIG;
135 #endif
136 ai_hints.ai_family = AF_UNSPEC;
137 ai_hints.ai_socktype = SOCK_DGRAM;
139 status = getaddrinfo (srv->node, srv->service, &ai_hints, &ai_list);
140 if (status != 0)
141 return (status);
142 assert (ai_list != NULL);
144 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
145 {
146 srv->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
147 if (srv->fd < 0)
148 continue;
150 if (ai_ptr->ai_family == AF_INET)
151 {
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 status = setsockopt (srv->fd, IPPROTO_IP, optname,
161 &srv->ttl, sizeof (srv->ttl));
162 }
163 else if (ai_ptr->ai_family == AF_INET6)
164 {
165 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
166 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai_ptr->ai_addr;
167 int optname;
169 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
170 optname = IPV6_MULTICAST_HOPS;
171 else
172 optname = IPV6_UNICAST_HOPS;
174 status = setsockopt (srv->fd, IPPROTO_IPV6, optname,
175 &srv->ttl, sizeof (srv->ttl));
176 }
177 if (status != 0)
178 {
179 /* setsockopt failed. */
180 close (srv->fd);
181 srv->fd = -1;
182 continue;
183 }
185 srv->sa = malloc (ai_ptr->ai_addrlen);
186 if (srv->sa == NULL)
187 {
188 close (srv->fd);
189 srv->fd = -1;
190 continue;
191 }
193 memcpy (srv->sa, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
194 srv->sa_len = ai_ptr->ai_addrlen;
195 break;
196 }
198 freeaddrinfo (ai_list);
200 if (srv->fd < 0)
201 return (-1);
202 return (0);
203 } /* }}} int server_open_socket */
205 static int server_send_buffer (lcc_server_t *srv) /* {{{ */
206 {
207 char buffer[LCC_NETWORK_BUFFER_SIZE_DEFAULT];
208 size_t buffer_size;
209 int status;
211 if (srv->fd < 0)
212 {
213 status = server_open_socket (srv);
214 if (status != 0)
215 return (status);
216 }
218 memset (buffer, 0, sizeof (buffer));
219 buffer_size = sizeof (buffer);
221 status = lcc_network_buffer_finalize (srv->buffer);
222 if (status != 0)
223 {
224 lcc_network_buffer_initialize (srv->buffer);
225 return (status);
226 }
228 status = lcc_network_buffer_get (srv->buffer, buffer, &buffer_size);
229 lcc_network_buffer_initialize (srv->buffer);
231 if (status != 0)
232 return (status);
234 if (buffer_size > sizeof (buffer))
235 buffer_size = sizeof (buffer);
237 while (42)
238 {
239 assert (srv->fd >= 0);
240 assert (srv->sa != NULL);
241 status = (int) sendto (srv->fd, buffer, buffer_size, /* flags = */ 0,
242 srv->sa, srv->sa_len);
243 if ((status < 0) && ((errno == EINTR) || (errno == EAGAIN)))
244 continue;
246 break;
247 }
249 if (status < 0)
250 return (status);
251 return (0);
252 } /* }}} int server_send_buffer */
254 static int server_value_add (lcc_server_t *srv, /* {{{ */
255 const lcc_value_list_t *vl)
256 {
257 int status;
259 status = lcc_network_buffer_add_value (srv->buffer, vl);
260 if (status == 0)
261 return (0);
263 server_send_buffer (srv);
264 return (lcc_network_buffer_add_value (srv->buffer, vl));
265 } /* }}} int server_value_add */
267 /*
268 * Public functions
269 */
270 lcc_network_t *lcc_network_create (void) /* {{{ */
271 {
272 lcc_network_t *net;
274 net = calloc (1, sizeof (*net));
275 if (net == NULL)
276 return (NULL);
278 net->servers = NULL;
280 return (net);
281 } /* }}} lcc_network_t *lcc_network_create */
283 void lcc_network_destroy (lcc_network_t *net) /* {{{ */
284 {
285 if (net == NULL)
286 return;
287 int_server_destroy (net->servers);
288 free (net);
289 } /* }}} void lcc_network_destroy */
291 lcc_server_t *lcc_server_create (lcc_network_t *net, /* {{{ */
292 const char *node, const char *service)
293 {
294 lcc_server_t *srv;
296 if ((net == NULL) || (node == NULL))
297 return (NULL);
298 if (service == NULL)
299 service = NET_DEFAULT_PORT;
301 srv = calloc (1, sizeof (*srv));
302 if (srv == NULL)
303 return (NULL);
305 srv->fd = -1;
306 srv->security_level = NONE;
307 srv->username = NULL;
308 srv->password = NULL;
309 srv->next = NULL;
311 srv->node = strdup (node);
312 if (srv->node == NULL)
313 {
314 free (srv);
315 return (NULL);
316 }
318 srv->service = strdup (service);
319 if (srv->service == NULL)
320 {
321 free (srv->node);
322 free (srv);
323 return (NULL);
324 }
326 srv->buffer = lcc_network_buffer_create (/* size = */ 0);
327 if (srv->buffer == NULL)
328 {
329 free (srv->service);
330 free (srv->node);
331 free (srv);
332 return (NULL);
333 }
335 if (net->servers == NULL)
336 {
337 net->servers = srv;
338 }
339 else
340 {
341 lcc_server_t *last = net->servers;
343 while (last->next != NULL)
344 last = last->next;
346 last->next = srv;
347 }
349 return (srv);
350 } /* }}} lcc_server_t *lcc_server_create */
352 int lcc_server_destroy (lcc_network_t *net, lcc_server_t *srv) /* {{{ */
353 {
354 if ((net == NULL) || (srv == NULL))
355 return (EINVAL);
357 if (net->servers == srv)
358 {
359 net->servers = srv->next;
360 srv->next = NULL;
361 }
362 else
363 {
364 lcc_server_t *prev = net->servers;
366 while ((prev != NULL) && (prev->next != srv))
367 prev = prev->next;
369 if (prev == NULL)
370 return (ENOENT);
372 prev->next = srv->next;
373 srv->next = NULL;
374 }
376 int_server_destroy (srv);
378 return (0);
379 } /* }}} int lcc_server_destroy */
381 int lcc_server_set_ttl (lcc_server_t *srv, uint8_t ttl) /* {{{ */
382 {
383 if (srv == NULL)
384 return (EINVAL);
386 srv->ttl = (int) ttl;
388 return (0);
389 } /* }}} int lcc_server_set_ttl */
391 int lcc_server_set_interface (lcc_server_t *srv, char const *interface) /* {{{ */
392 {
393 unsigned int if_index;
394 int status;
396 if ((srv == NULL) || (interface == NULL))
397 return (EINVAL);
399 if_index = if_nametoindex (interface);
400 if (if_index == 0)
401 return (ENOENT);
403 /* IPv4 multicast */
404 if (srv->sa->sa_family == AF_INET)
405 {
406 struct sockaddr_in *addr = (struct sockaddr_in *) srv->sa;
408 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
409 {
410 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
411 /* If possible, use the "ip_mreqn" structure which has
412 * an "interface index" member. Using the interface
413 * index is preferred here, because of its similarity
414 * to the way IPv6 handles this. Unfortunately, it
415 * appears not to be portable. */
416 struct ip_mreqn mreq;
418 memset (&mreq, 0, sizeof (mreq));
419 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
420 mreq.imr_address.s_addr = ntohl (INADDR_ANY);
421 mreq.imr_ifindex = (int) if_index;
422 #else
423 struct ip_mreq mreq;
425 memset (&mreq, 0, sizeof (mreq));
426 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
427 mreq.imr_interface.s_addr = ntohl (INADDR_ANY);
428 #endif
430 status = setsockopt (srv->fd, IPPROTO_IP, IP_MULTICAST_IF,
431 &mreq, sizeof (mreq));
432 if (status != 0)
433 return (status);
435 return (0);
436 }
437 }
439 /* IPv6 multicast */
440 if (srv->sa->sa_family == AF_INET6)
441 {
442 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) srv->sa;
444 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
445 {
446 status = setsockopt (srv->fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
447 &if_index, sizeof (if_index));
448 if (status != 0)
449 return (status);
451 return (0);
452 }
453 }
455 /* else: Not a multicast interface. */
456 #if defined(SO_BINDTODEVICE)
457 status = setsockopt (srv->fd, SOL_SOCKET, SO_BINDTODEVICE, interface,
458 (socklen_t) (strlen (interface) + 1));
459 if (status != 0)
460 return (-1);
461 #endif
463 return (0);
464 } /* }}} int lcc_server_set_interface */
466 int lcc_server_set_security_level (lcc_server_t *srv, /* {{{ */
467 lcc_security_level_t level,
468 const char *username, const char *password)
469 {
470 return (lcc_network_buffer_set_security_level (srv->buffer,
471 level, username, password));
472 } /* }}} int lcc_server_set_security_level */
474 int lcc_network_values_send (lcc_network_t *net, /* {{{ */
475 const lcc_value_list_t *vl)
476 {
477 lcc_server_t *srv;
479 if ((net == NULL) || (vl == NULL))
480 return (EINVAL);
482 for (srv = net->servers; srv != NULL; srv = srv->next)
483 server_value_add (srv, vl);
485 return (0);
486 } /* }}} int lcc_network_values_send */
488 /* vim: set sw=2 sts=2 et fdm=marker : */