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>
27 #include <sys/types.h>
28 #include <sys/socket.h>
29 #include <netinet/in.h>
30 #include <arpa/inet.h>
37 #include "utils_debug.h"
42 * The IPv4 Organization Local Scope -- 239.192.0.0/14
44 * 239.192.0.0/14 is defined to be the IPv4 Organization Local Scope, and is
45 * the space from which an organization should allocate sub-ranges when
46 * defining scopes for private use.
48 * Port 25826 is not assigned as of 2005-09-12
51 #define IPV4_MCAST_GROUP "239.192.74.66"
52 #define UDP_PORT 25826
54 /* 1500 - 40 - 8 = Ethernet packet - IPv6 header - UDP header */
55 /* #define BUFF_SIZE 1452 */
57 #define BUFF_SIZE 4096
60 extern int operating_mode;
62 static int operating_mode = MODE_CLIENT;
65 typedef struct sockent
68 struct sockaddr_storage *addr;
73 static sockent_t *socklist_head = NULL;
75 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
79 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
81 syslog (LOG_ERR, "bind: %s", strerror (errno));
85 if (ai->ai_family == AF_INET)
87 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
88 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
92 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
93 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
95 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
96 &loop, sizeof (loop)) == -1)
98 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
102 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
103 &mreq, sizeof (mreq)) == -1)
105 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
110 else if (ai->ai_family == AF_INET6)
112 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
113 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
114 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
116 struct ipv6_mreq mreq;
118 memcpy (&mreq.ipv6mr_multiaddr,
120 sizeof (addr->sin6_addr));
122 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
123 * ipv6mr_interface may be set to zeroes to
124 * choose the default multicast interface or to
125 * the index of a particular multicast-capable
126 * interface if the host is multihomed.
127 * Membership is associ-associated with a
128 * single interface; programs running on
129 * multihomed hosts may need to join the same
130 * group on more than one interface.*/
131 mreq.ipv6mr_interface = 0;
133 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
134 &loop, sizeof (loop)) == -1)
136 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
140 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
141 &mreq, sizeof (mreq)) == -1)
143 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
152 int network_create_socket (const char *node, const char *service)
154 sockent_t *socklist_tail;
156 struct addrinfo ai_hints;
157 struct addrinfo *ai_list, *ai_ptr;
162 DBG ("node = %s, service = %s", node, service);
164 if (operating_mode == MODE_LOCAL)
167 socklist_tail = socklist_head;
168 while ((socklist_tail != NULL) && (socklist_tail->next != NULL))
169 socklist_tail = socklist_tail->next;
171 memset (&ai_hints, '\0', sizeof (ai_hints));
172 ai_hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
173 ai_hints.ai_family = PF_UNSPEC;
174 ai_hints.ai_socktype = SOCK_DGRAM;
175 ai_hints.ai_protocol = IPPROTO_UDP; /* XXX is this right here?!? */
177 if ((ai_return = getaddrinfo (node, service, &ai_hints, &ai_list)) != 0)
179 syslog (LOG_ERR, "getaddrinfo (%s, %s): %s",
180 node == NULL ? "(null)" : node,
181 service == NULL ? "(null)" : service,
182 ai_return == EAI_SYSTEM ? strerror (errno) : gai_strerror (ai_return));
186 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
190 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
192 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
196 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
198 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
203 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
204 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
205 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
206 se->addrlen = ai_ptr->ai_addrlen;
208 se->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
213 syslog (LOG_ERR, "socket: %s", strerror (errno));
219 if (operating_mode == MODE_SERVER)
220 if (network_bind_socket (se, ai_ptr) != 0)
227 if (socklist_tail == NULL)
229 socklist_head = socklist_tail = se;
233 socklist_tail->next = se;
239 /* We don't open more than one write-socket per node/service pair.. */
240 if (operating_mode == MODE_CLIENT)
244 freeaddrinfo (ai_list);
249 static int network_get_listen_socket (void)
262 for (se = socklist_head; se != NULL; se = se->next)
264 FD_SET (se->fd, &readfds);
265 if (se->fd >= max_fd)
271 syslog (LOG_WARNING, "No listen sockets found!");
275 status = select (max_fd, &readfds, NULL, NULL, NULL);
277 if ((status == -1) && (errno == EINTR))
279 else if (status == -1)
281 syslog (LOG_ERR, "select: %s", strerror (errno));
289 for (se = socklist_head; se != NULL; se = se->next)
290 if (FD_ISSET (se->fd, &readfds))
297 syslog (LOG_WARNING, "No socket ready..?");
303 int network_receive (char **host, char **type, char **inst, char **value)
306 char buffer[BUFF_SIZE];
308 struct sockaddr_storage addr;
314 assert (operating_mode == MODE_SERVER);
321 if ((fd = network_get_listen_socket ()) < 0)
324 if (recvfrom (fd, buffer, BUFF_SIZE, 0, (struct sockaddr *) &addr, &addrlen) == -1)
326 syslog (LOG_ERR, "recvfrom: %s", strerror (errno));
330 if ((*host = (char *) malloc (BUFF_SIZE)) == NULL)
332 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
336 status = getnameinfo ((struct sockaddr *) &addr, addrlen,
337 *host, BUFF_SIZE, NULL, 0, 0);
340 free (*host); *host = NULL;
341 syslog (LOG_ERR, "getnameinfo: %s",
342 status == EAI_SYSTEM ? strerror (errno) : gai_strerror (status));
346 if (strsplit (buffer, fields, 4) != 3)
348 syslog (LOG_WARNING, "Invalid message from `%s'", *host);
349 free (*host); *host = NULL;
353 if ((*type = strdup (fields[0])) == NULL)
355 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
356 free (*host); *host = NULL;
360 if ((*inst = strdup (fields[1])) == NULL)
362 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
363 free (*host); *host = NULL;
364 free (*type); *type = NULL;
368 if ((*value = strdup (fields[2])) == NULL)
370 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
371 free (*host); *host = NULL;
372 free (*type); *type = NULL;
373 free (*inst); *inst = NULL;
377 DBG ("host = %s, type = %s, inst = %s, value = %s",
378 *host, *type, *inst, *value);
383 int network_send (char *type, char *inst, char *value)
393 DBG ("type = %s, inst = %s, value = %s", type, inst, value);
395 assert (operating_mode == MODE_CLIENT);
397 buflen = snprintf (buf, BUFF_SIZE, "%s %s %s", type, inst, value);
398 if ((buflen >= BUFF_SIZE) || (buflen < 1))
400 syslog (LOG_WARNING, "network_send: snprintf failed..");
407 for (se = socklist_head; se != NULL; se = se->next)
409 DBG ("fd = %i", se->fd);
413 status = sendto (se->fd, buf, buflen, 0,
414 (struct sockaddr *) se->addr, se->addrlen);
420 DBG ("sendto was interrupted");
425 syslog (LOG_ERR, "sendto: %s", strerror (errno));
436 syslog (LOG_WARNING, "Message wasn't sent to anybody..");