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 = 0;
223 ai_hints.ai_flags |= AI_PASSIVE;
226 ai_hints.ai_flags |= AI_ADDRCONFIG;
228 ai_hints.ai_family = PF_UNSPEC;
229 ai_hints.ai_socktype = SOCK_DGRAM;
230 ai_hints.ai_protocol = IPPROTO_UDP;
232 if ((ai_return = getaddrinfo (node, service, &ai_hints, &ai_list)) != 0)
234 syslog (LOG_ERR, "getaddrinfo (%s, %s): %s",
235 node == NULL ? "(null)" : node,
236 service == NULL ? "(null)" : service,
237 ai_return == EAI_SYSTEM ? strerror (errno) : gai_strerror (ai_return));
241 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
245 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
247 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
251 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
253 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
258 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
259 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
260 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
261 se->addrlen = ai_ptr->ai_addrlen;
263 se->mode = operating_mode;
264 se->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
269 syslog (LOG_ERR, "socket: %s", strerror (errno));
275 if (operating_mode == MODE_SERVER)
277 if (network_bind_socket (se, ai_ptr) != 0)
284 else if (operating_mode == MODE_CLIENT)
286 network_set_ttl (se, ai_ptr);
289 if (socklist_tail == NULL)
296 socklist_tail->next = se;
302 /* We don't open more than one write-socket per node/service pair.. */
303 if (operating_mode == MODE_CLIENT)
307 freeaddrinfo (ai_list);
312 static int network_connect_default (void)
316 if (socklist_head != NULL)
319 DBG ("socklist_head is NULL");
323 if (network_create_socket (NET_DEFAULT_V6_ADDR, NET_DEFAULT_PORT) > 0)
326 /* Don't use IPv4 and IPv6 in parallel by default.. */
327 if ((operating_mode == MODE_CLIENT) && (ret != 0))
330 if (network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT) > 0)
339 static int network_get_listen_socket (void)
348 if (socklist_head == NULL)
349 network_connect_default ();
353 for (se = socklist_head; se != NULL; se = se->next)
355 if (se->mode != operating_mode)
358 FD_SET (se->fd, &readfds);
359 if (se->fd >= max_fd)
365 syslog (LOG_WARNING, "No listen sockets found!");
369 status = select (max_fd, &readfds, NULL, NULL, NULL);
374 syslog (LOG_ERR, "select: %s", strerror (errno));
379 for (se = socklist_head; se != NULL; se = se->next)
381 if (se->mode != operating_mode)
384 if (FD_ISSET (se->fd, &readfds))
392 syslog (LOG_WARNING, "No socket ready..?");
398 int network_receive (char **host, char **type, char **inst, char **value)
401 char buffer[BUFF_SIZE];
403 struct sockaddr_storage addr;
409 assert (operating_mode == MODE_SERVER);
416 if ((fd = network_get_listen_socket ()) < 0)
419 addrlen = sizeof (addr);
420 if (recvfrom (fd, buffer, BUFF_SIZE, 0, (struct sockaddr *) &addr, &addrlen) == -1)
422 syslog (LOG_ERR, "recvfrom: %s", strerror (errno));
426 if ((*host = (char *) malloc (BUFF_SIZE)) == NULL)
428 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
432 status = getnameinfo ((struct sockaddr *) &addr, addrlen,
433 *host, BUFF_SIZE, NULL, 0, 0);
436 free (*host); *host = NULL;
437 syslog (LOG_ERR, "getnameinfo: %s",
438 status == EAI_SYSTEM ? strerror (errno) : gai_strerror (status));
442 if (strsplit (buffer, fields, 4) != 3)
444 syslog (LOG_WARNING, "Invalid message from `%s'", *host);
445 free (*host); *host = NULL;
449 if ((*type = strdup (fields[0])) == NULL)
451 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
452 free (*host); *host = NULL;
456 if ((*inst = strdup (fields[1])) == NULL)
458 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
459 free (*host); *host = NULL;
460 free (*type); *type = NULL;
464 if ((*value = strdup (fields[2])) == NULL)
466 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
467 free (*host); *host = NULL;
468 free (*type); *type = NULL;
469 free (*inst); *inst = NULL;
473 DBG ("host = %s, type = %s, inst = %s, value = %s",
474 *host, *type, *inst, *value);
479 int network_send (char *type, char *inst, char *value)
489 DBG ("type = %s, inst = %s, value = %s", type, inst, value);
491 assert (operating_mode == MODE_CLIENT);
493 buflen = snprintf (buf, BUFF_SIZE, "%s %s %s", type, inst, value);
494 if ((buflen >= BUFF_SIZE) || (buflen < 1))
496 syslog (LOG_WARNING, "network_send: snprintf failed..");
502 if (socklist_head == NULL)
503 network_connect_default ();
506 for (se = socklist_head; se != NULL; se = se->next)
508 if (se->mode != operating_mode)
511 DBG ("fd = %i", se->fd);
515 status = sendto (se->fd, buf, buflen, 0,
516 (struct sockaddr *) se->addr, se->addrlen);
522 DBG ("sendto was interrupted");
527 syslog (LOG_ERR, "sendto: %s", strerror (errno));
539 syslog (LOG_WARNING, "Message wasn't sent to anybody..");