ddb3b5b9b35c03b5aa93a74eb6fab8347b562b98
1 /**
2 * collectd - src/libcollectdclient/network.c
3 * Copyright (C) 2005-2013 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 free (srv->sa);
93 srv->sa = NULL;
94 srv->sa_len = 0;
96 return (0);
97 } /* }}} int server_close_socket */
99 static void int_server_destroy (lcc_server_t *srv) /* {{{ */
100 {
101 lcc_server_t *next;
103 if (srv == NULL)
104 return;
106 server_close_socket (srv);
108 next = srv->next;
110 if (srv->fd >= 0)
111 {
112 close (srv->fd);
113 srv->fd = -1;
114 }
116 free (srv->node);
117 free (srv->service);
118 free (srv->username);
119 free (srv->password);
120 free (srv);
122 int_server_destroy (next);
123 } /* }}} void int_server_destroy */
125 static int server_open_socket (lcc_server_t *srv) /* {{{ */
126 {
127 struct addrinfo ai_hints = { 0 };
128 struct addrinfo *ai_list = NULL;
129 struct addrinfo *ai_ptr;
130 int status;
132 if (srv == NULL)
133 return (EINVAL);
135 if (srv->fd >= 0)
136 server_close_socket (srv);
138 #ifdef AI_ADDRCONFIG
139 ai_hints.ai_flags |= AI_ADDRCONFIG;
140 #endif
141 ai_hints.ai_family = AF_UNSPEC;
142 ai_hints.ai_socktype = SOCK_DGRAM;
144 status = getaddrinfo (srv->node, srv->service, &ai_hints, &ai_list);
145 if (status != 0)
146 return (status);
147 assert (ai_list != NULL);
149 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
150 {
151 srv->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
152 if (srv->fd < 0)
153 continue;
155 if (ai_ptr->ai_family == AF_INET)
156 {
158 struct sockaddr_in *addr = (struct sockaddr_in *) ai_ptr->ai_addr;
159 int optname;
161 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
162 optname = IP_MULTICAST_TTL;
163 else
164 optname = IP_TTL;
166 setsockopt (srv->fd, IPPROTO_IP, optname,
167 &srv->ttl,
168 sizeof (srv->ttl));
169 }
170 else if (ai_ptr->ai_family == AF_INET6)
171 {
172 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
173 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai_ptr->ai_addr;
174 int optname;
176 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
177 optname = IPV6_MULTICAST_HOPS;
178 else
179 optname = IPV6_UNICAST_HOPS;
181 setsockopt (srv->fd, IPPROTO_IPV6, optname,
182 &srv->ttl,
183 sizeof (srv->ttl));
184 }
186 srv->sa = malloc (ai_ptr->ai_addrlen);
187 if (srv->sa == NULL)
188 {
189 close (srv->fd);
190 srv->fd = -1;
191 continue;
192 }
194 memcpy (srv->sa, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
195 srv->sa_len = ai_ptr->ai_addrlen;
196 break;
197 }
199 freeaddrinfo (ai_list);
201 if (srv->fd < 0)
202 return (-1);
203 return (0);
204 } /* }}} int server_open_socket */
206 static int server_send_buffer (lcc_server_t *srv) /* {{{ */
207 {
208 char buffer[LCC_NETWORK_BUFFER_SIZE_DEFAULT];
209 size_t buffer_size;
210 int status;
212 if (srv->fd < 0)
213 {
214 status = server_open_socket (srv);
215 if (status != 0)
216 return (status);
217 }
219 memset (buffer, 0, sizeof (buffer));
220 buffer_size = sizeof (buffer);
222 lcc_network_buffer_finalize (srv->buffer);
223 status = lcc_network_buffer_get (srv->buffer, buffer, &buffer_size);
224 lcc_network_buffer_initialize (srv->buffer);
226 if (status != 0)
227 return (status);
229 if (buffer_size > sizeof (buffer))
230 buffer_size = sizeof (buffer);
232 while (42)
233 {
234 assert (srv->fd >= 0);
235 assert (srv->sa != NULL);
236 status = (int) sendto (srv->fd, buffer, buffer_size, /* flags = */ 0,
237 srv->sa, srv->sa_len);
238 if ((status < 0) && ((errno == EINTR) || (errno == EAGAIN)))
239 continue;
241 break;
242 }
244 if (status < 0)
245 return (status);
246 return (0);
247 } /* }}} int server_send_buffer */
249 static int server_value_add (lcc_server_t *srv, /* {{{ */
250 const lcc_value_list_t *vl)
251 {
252 int status;
254 status = lcc_network_buffer_add_value (srv->buffer, vl);
255 if (status == 0)
256 return (0);
258 server_send_buffer (srv);
259 return (lcc_network_buffer_add_value (srv->buffer, vl));
260 } /* }}} int server_value_add */
262 /*
263 * Public functions
264 */
265 lcc_network_t *lcc_network_create (void) /* {{{ */
266 {
267 lcc_network_t *net;
269 net = malloc (sizeof (*net));
270 if (net == NULL)
271 return (NULL);
272 memset (net, 0, sizeof (*net));
274 net->servers = NULL;
276 return (net);
277 } /* }}} lcc_network_t *lcc_network_create */
279 void lcc_network_destroy (lcc_network_t *net) /* {{{ */
280 {
281 if (net == NULL)
282 return;
283 int_server_destroy (net->servers);
284 free (net);
285 } /* }}} void lcc_network_destroy */
287 lcc_server_t *lcc_server_create (lcc_network_t *net, /* {{{ */
288 const char *node, const char *service)
289 {
290 lcc_server_t *srv;
292 if ((net == NULL) || (node == NULL))
293 return (NULL);
294 if (service == NULL)
295 service = NET_DEFAULT_PORT;
297 srv = malloc (sizeof (*srv));
298 if (srv == NULL)
299 return (NULL);
300 memset (srv, 0, sizeof (*srv));
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 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;
415 memset (&mreq, 0, sizeof (mreq));
416 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
417 mreq.imr_address.s_addr = ntohl (INADDR_ANY);
418 mreq.imr_ifindex = if_index;
419 #else
420 struct ip_mreq mreq;
422 memset (&mreq, 0, sizeof (mreq));
423 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
424 mreq.imr_interface.s_addr = ntohl (INADDR_ANY);
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,
455 interface, 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 : */