2 * collectd - src/network.c
3 * Copyright (C) 2006 Florian octo Forster
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Florian octo Forster <octo at verplant.org>
26 #include <sys/types.h>
27 #include <sys/socket.h>
29 #include <netinet/in.h>
30 #include <arpa/inet.h>
36 #include "configfile.h"
37 #include "utils_debug.h"
39 /* 1500 - 40 - 8 = Ethernet packet - IPv6 header - UDP header */
40 /* #define BUFF_SIZE 1452 */
42 #define BUFF_SIZE 4096
45 extern int operating_mode;
47 static int operating_mode = MODE_CLIENT;
50 typedef struct sockent
54 struct sockaddr_storage *addr;
59 static sockent_t *socklist_head = NULL;
61 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
66 ttl_str = cf_get_option ("TimeToLive", NULL);
70 ttl_int = atoi (ttl_str);
71 if ((ttl_int < 1) || (ttl_int > 255))
73 syslog (LOG_WARNING, "A TTL value of %i is invalid.", ttl_int);
77 DBG ("ttl = %i", ttl_int);
79 if (ai->ai_family == AF_INET)
81 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
84 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
85 optname = IP_MULTICAST_TTL;
89 if (setsockopt (se->fd, IPPROTO_IP, optname,
90 &ttl_int, sizeof (ttl_int)) == -1)
92 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
96 else if (ai->ai_family == AF_INET6)
98 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
99 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
102 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
103 optname = IPV6_MULTICAST_HOPS;
105 optname = IPV6_UNICAST_HOPS;
107 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
108 &ttl_int, sizeof (ttl_int)) == -1)
110 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
118 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
122 DBG ("fd = %i; calling `bind'", se->fd);
124 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
126 syslog (LOG_ERR, "bind: %s", strerror (errno));
130 if (ai->ai_family == AF_INET)
132 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
133 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
137 DBG ("fd = %i; IPv4 multicast address found", se->fd);
139 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
140 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
142 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
143 &loop, sizeof (loop)) == -1)
145 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
149 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
150 &mreq, sizeof (mreq)) == -1)
152 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
157 else if (ai->ai_family == AF_INET6)
159 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
160 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
161 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
163 struct ipv6_mreq mreq;
165 DBG ("fd = %i; IPv6 multicast address found", se->fd);
167 memcpy (&mreq.ipv6mr_multiaddr,
169 sizeof (addr->sin6_addr));
171 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
172 * ipv6mr_interface may be set to zeroes to
173 * choose the default multicast interface or to
174 * the index of a particular multicast-capable
175 * interface if the host is multihomed.
176 * Membership is associ-associated with a
177 * single interface; programs running on
178 * multihomed hosts may need to join the same
179 * group on more than one interface.*/
180 mreq.ipv6mr_interface = 0;
182 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
183 &loop, sizeof (loop)) == -1)
185 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
189 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
190 &mreq, sizeof (mreq)) == -1)
192 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
201 int network_create_socket (const char *node, const char *service)
203 sockent_t *socklist_tail;
205 struct addrinfo ai_hints;
206 struct addrinfo *ai_list, *ai_ptr;
211 DBG ("node = %s, service = %s", node, service);
213 if (operating_mode == MODE_LOCAL)
216 socklist_tail = socklist_head;
217 while ((socklist_tail != NULL) && (socklist_tail->next != NULL))
218 socklist_tail = socklist_tail->next;
220 memset (&ai_hints, '\0', sizeof (ai_hints));
221 ai_hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
222 ai_hints.ai_family = PF_UNSPEC;
223 ai_hints.ai_socktype = SOCK_DGRAM;
224 ai_hints.ai_protocol = IPPROTO_UDP;
226 if ((ai_return = getaddrinfo (node, service, &ai_hints, &ai_list)) != 0)
228 syslog (LOG_ERR, "getaddrinfo (%s, %s): %s",
229 node == NULL ? "(null)" : node,
230 service == NULL ? "(null)" : service,
231 ai_return == EAI_SYSTEM ? strerror (errno) : gai_strerror (ai_return));
235 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
239 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
241 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
245 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
247 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
252 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
253 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
254 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
255 se->addrlen = ai_ptr->ai_addrlen;
257 se->mode = operating_mode;
258 se->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
263 syslog (LOG_ERR, "socket: %s", strerror (errno));
269 if (operating_mode == MODE_SERVER)
271 if (network_bind_socket (se, ai_ptr) != 0)
278 else if (operating_mode == MODE_CLIENT)
280 network_set_ttl (se, ai_ptr);
283 if (socklist_tail == NULL)
290 socklist_tail->next = se;
296 /* We don't open more than one write-socket per node/service pair.. */
297 if (operating_mode == MODE_CLIENT)
301 freeaddrinfo (ai_list);
306 static int network_connect_default (void)
310 if (socklist_head != NULL)
313 DBG ("socklist_head is NULL");
317 if (network_create_socket (NET_DEFAULT_V6_ADDR, NET_DEFAULT_PORT) > 0)
320 /* Don't use IPv4 and IPv6 in parallel by default.. */
321 if ((operating_mode == MODE_CLIENT) && (ret != 0))
324 if (network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT) > 0)
333 static int network_get_listen_socket (void)
342 if (socklist_head == NULL)
343 network_connect_default ();
347 for (se = socklist_head; se != NULL; se = se->next)
349 if (se->mode != operating_mode)
352 FD_SET (se->fd, &readfds);
353 if (se->fd >= max_fd)
359 syslog (LOG_WARNING, "No listen sockets found!");
363 status = select (max_fd, &readfds, NULL, NULL, NULL);
368 syslog (LOG_ERR, "select: %s", strerror (errno));
373 for (se = socklist_head; se != NULL; se = se->next)
375 if (se->mode != operating_mode)
378 if (FD_ISSET (se->fd, &readfds))
386 syslog (LOG_WARNING, "No socket ready..?");
392 int network_receive (char **host, char **type, char **inst, char **value)
395 char buffer[BUFF_SIZE];
397 struct sockaddr_storage addr;
403 assert (operating_mode == MODE_SERVER);
410 if ((fd = network_get_listen_socket ()) < 0)
413 addrlen = sizeof (addr);
414 if (recvfrom (fd, buffer, BUFF_SIZE, 0, (struct sockaddr *) &addr, &addrlen) == -1)
416 syslog (LOG_ERR, "recvfrom: %s", strerror (errno));
420 if ((*host = (char *) malloc (BUFF_SIZE)) == NULL)
422 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
426 status = getnameinfo ((struct sockaddr *) &addr, addrlen,
427 *host, BUFF_SIZE, NULL, 0, 0);
430 free (*host); *host = NULL;
431 syslog (LOG_ERR, "getnameinfo: %s",
432 status == EAI_SYSTEM ? strerror (errno) : gai_strerror (status));
436 if (strsplit (buffer, fields, 4) != 3)
438 syslog (LOG_WARNING, "Invalid message from `%s'", *host);
439 free (*host); *host = NULL;
443 if ((*type = strdup (fields[0])) == NULL)
445 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
446 free (*host); *host = NULL;
450 if ((*inst = strdup (fields[1])) == NULL)
452 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
453 free (*host); *host = NULL;
454 free (*type); *type = NULL;
458 if ((*value = strdup (fields[2])) == NULL)
460 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
461 free (*host); *host = NULL;
462 free (*type); *type = NULL;
463 free (*inst); *inst = NULL;
467 DBG ("host = %s, type = %s, inst = %s, value = %s",
468 *host, *type, *inst, *value);
473 int network_send (char *type, char *inst, char *value)
483 DBG ("type = %s, inst = %s, value = %s", type, inst, value);
485 assert (operating_mode == MODE_CLIENT);
487 buflen = snprintf (buf, BUFF_SIZE, "%s %s %s", type, inst, value);
488 if ((buflen >= BUFF_SIZE) || (buflen < 1))
490 syslog (LOG_WARNING, "network_send: snprintf failed..");
496 if (socklist_head == NULL)
497 network_connect_default ();
500 for (se = socklist_head; se != NULL; se = se->next)
502 if (se->mode != operating_mode)
505 DBG ("fd = %i", se->fd);
509 status = sendto (se->fd, buf, buflen, 0,
510 (struct sockaddr *) se->addr, se->addrlen);
516 DBG ("sendto was interrupted");
521 syslog (LOG_ERR, "sendto: %s", strerror (errno));
533 syslog (LOG_WARNING, "Message wasn't sent to anybody..");