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] = { 0 };
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 buffer_size = sizeof (buffer);
220 status = lcc_network_buffer_finalize (srv->buffer);
221 if (status != 0)
222 {
223 lcc_network_buffer_initialize (srv->buffer);
224 return (status);
225 }
227 status = lcc_network_buffer_get (srv->buffer, buffer, &buffer_size);
228 lcc_network_buffer_initialize (srv->buffer);
230 if (status != 0)
231 return (status);
233 if (buffer_size > sizeof (buffer))
234 buffer_size = sizeof (buffer);
236 while (42)
237 {
238 assert (srv->fd >= 0);
239 assert (srv->sa != NULL);
240 status = (int) sendto (srv->fd, buffer, buffer_size, /* flags = */ 0,
241 srv->sa, srv->sa_len);
242 if ((status < 0) && ((errno == EINTR) || (errno == EAGAIN)))
243 continue;
245 break;
246 }
248 if (status < 0)
249 return (status);
250 return (0);
251 } /* }}} int server_send_buffer */
253 static int server_value_add (lcc_server_t *srv, /* {{{ */
254 const lcc_value_list_t *vl)
255 {
256 int status;
258 status = lcc_network_buffer_add_value (srv->buffer, vl);
259 if (status == 0)
260 return (0);
262 server_send_buffer (srv);
263 return (lcc_network_buffer_add_value (srv->buffer, vl));
264 } /* }}} int server_value_add */
266 /*
267 * Public functions
268 */
269 lcc_network_t *lcc_network_create (void) /* {{{ */
270 {
271 lcc_network_t *net;
273 net = calloc (1, sizeof (*net));
274 if (net == NULL)
275 return (NULL);
277 net->servers = NULL;
279 return (net);
280 } /* }}} lcc_network_t *lcc_network_create */
282 void lcc_network_destroy (lcc_network_t *net) /* {{{ */
283 {
284 if (net == NULL)
285 return;
286 int_server_destroy (net->servers);
287 free (net);
288 } /* }}} void lcc_network_destroy */
290 lcc_server_t *lcc_server_create (lcc_network_t *net, /* {{{ */
291 const char *node, const char *service)
292 {
293 lcc_server_t *srv;
295 if ((net == NULL) || (node == NULL))
296 return (NULL);
297 if (service == NULL)
298 service = NET_DEFAULT_PORT;
300 srv = calloc (1, sizeof (*srv));
301 if (srv == NULL)
302 return (NULL);
304 srv->fd = -1;
305 srv->security_level = NONE;
306 srv->username = NULL;
307 srv->password = NULL;
308 srv->next = NULL;
310 srv->node = strdup (node);
311 if (srv->node == NULL)
312 {
313 free (srv);
314 return (NULL);
315 }
317 srv->service = strdup (service);
318 if (srv->service == NULL)
319 {
320 free (srv->node);
321 free (srv);
322 return (NULL);
323 }
325 srv->buffer = lcc_network_buffer_create (/* size = */ 0);
326 if (srv->buffer == NULL)
327 {
328 free (srv->service);
329 free (srv->node);
330 free (srv);
331 return (NULL);
332 }
334 if (net->servers == NULL)
335 {
336 net->servers = srv;
337 }
338 else
339 {
340 lcc_server_t *last = net->servers;
342 while (last->next != NULL)
343 last = last->next;
345 last->next = srv;
346 }
348 return (srv);
349 } /* }}} lcc_server_t *lcc_server_create */
351 int lcc_server_destroy (lcc_network_t *net, lcc_server_t *srv) /* {{{ */
352 {
353 if ((net == NULL) || (srv == NULL))
354 return (EINVAL);
356 if (net->servers == srv)
357 {
358 net->servers = srv->next;
359 srv->next = NULL;
360 }
361 else
362 {
363 lcc_server_t *prev = net->servers;
365 while ((prev != NULL) && (prev->next != srv))
366 prev = prev->next;
368 if (prev == NULL)
369 return (ENOENT);
371 prev->next = srv->next;
372 srv->next = NULL;
373 }
375 int_server_destroy (srv);
377 return (0);
378 } /* }}} int lcc_server_destroy */
380 int lcc_server_set_ttl (lcc_server_t *srv, uint8_t ttl) /* {{{ */
381 {
382 if (srv == NULL)
383 return (EINVAL);
385 srv->ttl = (int) ttl;
387 return (0);
388 } /* }}} int lcc_server_set_ttl */
390 int lcc_server_set_interface (lcc_server_t *srv, char const *interface) /* {{{ */
391 {
392 unsigned int if_index;
393 int status;
395 if ((srv == NULL) || (interface == NULL))
396 return (EINVAL);
398 if_index = if_nametoindex (interface);
399 if (if_index == 0)
400 return (ENOENT);
402 /* IPv4 multicast */
403 if (srv->sa->sa_family == AF_INET)
404 {
405 struct sockaddr_in *addr = (struct sockaddr_in *) srv->sa;
407 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
408 {
409 #if HAVE_STRUCT_IP_MREQN_IMR_IFINDEX
410 /* If possible, use the "ip_mreqn" structure which has
411 * an "interface index" member. Using the interface
412 * index is preferred here, because of its similarity
413 * to the way IPv6 handles this. Unfortunately, it
414 * appears not to be portable. */
415 struct ip_mreqn mreq = {
416 .imr_multiaddr.s_addr = addr->sin_addr.s_addr,
417 .imr_address.s_addr = ntohl (INADDR_ANY),
418 .imr_ifindex = (int) if_index
419 };
420 #else
421 struct ip_mreq mreq = {
422 .imr_multiaddr.s_addr = addr->sin_addr.s_addr,
423 .imr_interface.s_addr = ntohl (INADDR_ANY)
424 };
425 #endif
427 status = setsockopt (srv->fd, IPPROTO_IP, IP_MULTICAST_IF,
428 &mreq, sizeof (mreq));
429 if (status != 0)
430 return (status);
432 return (0);
433 }
434 }
436 /* IPv6 multicast */
437 if (srv->sa->sa_family == AF_INET6)
438 {
439 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) srv->sa;
441 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
442 {
443 status = setsockopt (srv->fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
444 &if_index, sizeof (if_index));
445 if (status != 0)
446 return (status);
448 return (0);
449 }
450 }
452 /* else: Not a multicast interface. */
453 #if defined(SO_BINDTODEVICE)
454 status = setsockopt (srv->fd, SOL_SOCKET, SO_BINDTODEVICE, interface,
455 (socklen_t) (strlen (interface) + 1));
456 if (status != 0)
457 return (-1);
458 #endif
460 return (0);
461 } /* }}} int lcc_server_set_interface */
463 int lcc_server_set_security_level (lcc_server_t *srv, /* {{{ */
464 lcc_security_level_t level,
465 const char *username, const char *password)
466 {
467 return (lcc_network_buffer_set_security_level (srv->buffer,
468 level, username, password));
469 } /* }}} int lcc_server_set_security_level */
471 int lcc_network_values_send (lcc_network_t *net, /* {{{ */
472 const lcc_value_list_t *vl)
473 {
474 lcc_server_t *srv;
476 if ((net == NULL) || (vl == NULL))
477 return (EINVAL);
479 for (srv = net->servers; srv != NULL; srv = srv->next)
480 server_value_add (srv, vl);
482 return (0);
483 } /* }}} int lcc_network_values_send */
485 /* vim: set sw=2 sts=2 et fdm=marker : */