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 "utils_debug.h"
38 /* 1500 - 40 - 8 = Ethernet packet - IPv6 header - UDP header */
39 /* #define BUFF_SIZE 1452 */
41 #define BUFF_SIZE 4096
44 extern int operating_mode;
46 static int operating_mode = MODE_CLIENT;
49 typedef struct sockent
53 struct sockaddr_storage *addr;
58 static sockent_t *socklist_head = NULL;
60 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
64 DBG ("fd = %i; calling `bind'", se->fd);
66 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
68 syslog (LOG_ERR, "bind: %s", strerror (errno));
72 if (ai->ai_family == AF_INET)
74 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
75 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
79 DBG ("fd = %i; IPv4 multicast address found", se->fd);
81 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
82 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
84 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
85 &loop, sizeof (loop)) == -1)
87 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
91 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
92 &mreq, sizeof (mreq)) == -1)
94 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
99 else if (ai->ai_family == AF_INET6)
101 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
102 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
103 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
105 struct ipv6_mreq mreq;
107 DBG ("fd = %i; IPv6 multicast address found", se->fd);
109 memcpy (&mreq.ipv6mr_multiaddr,
111 sizeof (addr->sin6_addr));
113 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
114 * ipv6mr_interface may be set to zeroes to
115 * choose the default multicast interface or to
116 * the index of a particular multicast-capable
117 * interface if the host is multihomed.
118 * Membership is associ-associated with a
119 * single interface; programs running on
120 * multihomed hosts may need to join the same
121 * group on more than one interface.*/
122 mreq.ipv6mr_interface = 0;
124 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
125 &loop, sizeof (loop)) == -1)
127 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
131 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
132 &mreq, sizeof (mreq)) == -1)
134 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
143 int network_create_socket (const char *node, const char *service)
145 sockent_t *socklist_tail;
147 struct addrinfo ai_hints;
148 struct addrinfo *ai_list, *ai_ptr;
153 DBG ("node = %s, service = %s", node, service);
155 if (operating_mode == MODE_LOCAL)
158 socklist_tail = socklist_head;
159 while ((socklist_tail != NULL) && (socklist_tail->next != NULL))
160 socklist_tail = socklist_tail->next;
162 memset (&ai_hints, '\0', sizeof (ai_hints));
163 ai_hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
164 ai_hints.ai_family = PF_UNSPEC;
165 ai_hints.ai_socktype = SOCK_DGRAM;
166 ai_hints.ai_protocol = IPPROTO_UDP;
168 if ((ai_return = getaddrinfo (node, service, &ai_hints, &ai_list)) != 0)
170 syslog (LOG_ERR, "getaddrinfo (%s, %s): %s",
171 node == NULL ? "(null)" : node,
172 service == NULL ? "(null)" : service,
173 ai_return == EAI_SYSTEM ? strerror (errno) : gai_strerror (ai_return));
177 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
181 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
183 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
187 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
189 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
194 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
195 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
196 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
197 se->addrlen = ai_ptr->ai_addrlen;
199 se->mode = operating_mode;
200 se->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
205 syslog (LOG_ERR, "socket: %s", strerror (errno));
211 if (operating_mode == MODE_SERVER)
212 if (network_bind_socket (se, ai_ptr) != 0)
219 if (socklist_tail == NULL)
226 socklist_tail->next = se;
232 /* We don't open more than one write-socket per node/service pair.. */
233 if (operating_mode == MODE_CLIENT)
237 freeaddrinfo (ai_list);
242 static int network_connect_default (void)
246 if (socklist_head != NULL)
249 DBG ("socklist_head is NULL");
253 if (network_create_socket (NET_DEFAULT_V6_ADDR, NET_DEFAULT_PORT) > 0)
256 /* Don't use IPv4 and IPv6 in parallel by default.. */
257 if ((operating_mode == MODE_CLIENT) && (ret != 0))
260 if (network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT) > 0)
269 static int network_get_listen_socket (void)
278 if (socklist_head == NULL)
279 network_connect_default ();
283 for (se = socklist_head; se != NULL; se = se->next)
285 if (se->mode != operating_mode)
288 FD_SET (se->fd, &readfds);
289 if (se->fd >= max_fd)
295 syslog (LOG_WARNING, "No listen sockets found!");
299 status = select (max_fd, &readfds, NULL, NULL, NULL);
304 syslog (LOG_ERR, "select: %s", strerror (errno));
309 for (se = socklist_head; se != NULL; se = se->next)
311 if (se->mode != operating_mode)
314 if (FD_ISSET (se->fd, &readfds))
322 syslog (LOG_WARNING, "No socket ready..?");
328 int network_receive (char **host, char **type, char **inst, char **value)
331 char buffer[BUFF_SIZE];
333 struct sockaddr_storage addr;
339 assert (operating_mode == MODE_SERVER);
346 if ((fd = network_get_listen_socket ()) < 0)
349 addrlen = sizeof (addr);
350 if (recvfrom (fd, buffer, BUFF_SIZE, 0, (struct sockaddr *) &addr, &addrlen) == -1)
352 syslog (LOG_ERR, "recvfrom: %s", strerror (errno));
356 if ((*host = (char *) malloc (BUFF_SIZE)) == NULL)
358 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
362 status = getnameinfo ((struct sockaddr *) &addr, addrlen,
363 *host, BUFF_SIZE, NULL, 0, 0);
366 free (*host); *host = NULL;
367 syslog (LOG_ERR, "getnameinfo: %s",
368 status == EAI_SYSTEM ? strerror (errno) : gai_strerror (status));
372 if (strsplit (buffer, fields, 4) != 3)
374 syslog (LOG_WARNING, "Invalid message from `%s'", *host);
375 free (*host); *host = NULL;
379 if ((*type = strdup (fields[0])) == NULL)
381 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
382 free (*host); *host = NULL;
386 if ((*inst = strdup (fields[1])) == NULL)
388 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
389 free (*host); *host = NULL;
390 free (*type); *type = NULL;
394 if ((*value = strdup (fields[2])) == NULL)
396 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
397 free (*host); *host = NULL;
398 free (*type); *type = NULL;
399 free (*inst); *inst = NULL;
403 DBG ("host = %s, type = %s, inst = %s, value = %s",
404 *host, *type, *inst, *value);
409 int network_send (char *type, char *inst, char *value)
419 DBG ("type = %s, inst = %s, value = %s", type, inst, value);
421 assert (operating_mode == MODE_CLIENT);
423 buflen = snprintf (buf, BUFF_SIZE, "%s %s %s", type, inst, value);
424 if ((buflen >= BUFF_SIZE) || (buflen < 1))
426 syslog (LOG_WARNING, "network_send: snprintf failed..");
432 if (socklist_head == NULL)
433 network_connect_default ();
436 for (se = socklist_head; se != NULL; se = se->next)
438 if (se->mode != operating_mode)
441 DBG ("fd = %i", se->fd);
445 status = sendto (se->fd, buf, buflen, 0,
446 (struct sockaddr *) se->addr, se->addrlen);
452 DBG ("sendto was interrupted");
457 syslog (LOG_ERR, "sendto: %s", strerror (errno));
469 syslog (LOG_WARNING, "Message wasn't sent to anybody..");