2 * collectd - src/network.c
3 * Copyright (C) 2005,2006 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 #ifndef IPV6_ADD_MEMBERSHIP
43 # ifdef IPV6_JOIN_GROUP
44 # define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
46 # error "Neither IP_ADD_MEMBERSHIP nor IPV6_JOIN_GROUP is defined"
48 #endif /* !IP_ADD_MEMBERSHIP */
50 #define BUFF_SIZE 4096
52 extern int operating_mode;
54 typedef struct sockent
58 struct sockaddr_storage *addr;
63 static sockent_t *socklist_head = NULL;
65 static int network_set_ttl (const sockent_t *se, const struct addrinfo *ai)
70 ttl_str = cf_get_option ("TimeToLive", NULL);
74 ttl_int = atoi (ttl_str);
75 if ((ttl_int < 1) || (ttl_int > 255))
77 syslog (LOG_WARNING, "A TTL value of %i is invalid.", ttl_int);
81 DBG ("ttl = %i", ttl_int);
83 if (ai->ai_family == AF_INET)
85 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
88 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
89 optname = IP_MULTICAST_TTL;
93 if (setsockopt (se->fd, IPPROTO_IP, optname,
94 &ttl_int, sizeof (ttl_int)) == -1)
96 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
100 else if (ai->ai_family == AF_INET6)
102 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
103 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
106 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
107 optname = IPV6_MULTICAST_HOPS;
109 optname = IPV6_UNICAST_HOPS;
111 if (setsockopt (se->fd, IPPROTO_IPV6, optname,
112 &ttl_int, sizeof (ttl_int)) == -1)
114 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
122 static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
126 DBG ("fd = %i; calling `bind'", se->fd);
128 if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
130 syslog (LOG_ERR, "bind: %s", strerror (errno));
134 if (ai->ai_family == AF_INET)
136 struct sockaddr_in *addr = (struct sockaddr_in *) ai->ai_addr;
137 if (IN_MULTICAST (ntohl (addr->sin_addr.s_addr)))
141 DBG ("fd = %i; IPv4 multicast address found", se->fd);
143 mreq.imr_multiaddr.s_addr = addr->sin_addr.s_addr;
144 mreq.imr_interface.s_addr = htonl (INADDR_ANY);
146 if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
147 &loop, sizeof (loop)) == -1)
149 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
153 if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
154 &mreq, sizeof (mreq)) == -1)
156 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
161 else if (ai->ai_family == AF_INET6)
163 /* Useful example: http://gsyc.escet.urjc.es/~eva/IPv6-web/examples/mcast.html */
164 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) ai->ai_addr;
165 if (IN6_IS_ADDR_MULTICAST (&addr->sin6_addr))
167 struct ipv6_mreq mreq;
169 DBG ("fd = %i; IPv6 multicast address found", se->fd);
171 memcpy (&mreq.ipv6mr_multiaddr,
173 sizeof (addr->sin6_addr));
175 /* http://developer.apple.com/documentation/Darwin/Reference/ManPages/man4/ip6.4.html
176 * ipv6mr_interface may be set to zeroes to
177 * choose the default multicast interface or to
178 * the index of a particular multicast-capable
179 * interface if the host is multihomed.
180 * Membership is associ-associated with a
181 * single interface; programs running on
182 * multihomed hosts may need to join the same
183 * group on more than one interface.*/
184 mreq.ipv6mr_interface = 0;
186 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
187 &loop, sizeof (loop)) == -1)
189 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
193 if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
194 &mreq, sizeof (mreq)) == -1)
196 syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
205 int network_create_socket (const char *node, const char *service)
207 sockent_t *socklist_tail;
209 struct addrinfo ai_hints;
210 struct addrinfo *ai_list, *ai_ptr;
215 DBG ("node = %s, service = %s", node, service);
217 if (operating_mode == MODE_LOCAL || operating_mode == MODE_LOG)
219 syslog (LOG_WARNING, "network_create_socket: There is no point opening a socket when you are in mode `%s'.",
220 operating_mode == MODE_LOCAL ? "Local" : "Log");
224 socklist_tail = socklist_head;
225 while ((socklist_tail != NULL) && (socklist_tail->next != NULL))
226 socklist_tail = socklist_tail->next;
228 memset (&ai_hints, '\0', sizeof (ai_hints));
229 ai_hints.ai_flags = 0;
231 ai_hints.ai_flags |= AI_PASSIVE;
234 ai_hints.ai_flags |= AI_ADDRCONFIG;
236 ai_hints.ai_family = PF_UNSPEC;
237 ai_hints.ai_socktype = SOCK_DGRAM;
238 ai_hints.ai_protocol = IPPROTO_UDP;
240 if ((ai_return = getaddrinfo (node, service, &ai_hints, &ai_list)) != 0)
242 syslog (LOG_ERR, "getaddrinfo (%s, %s): %s",
243 node == NULL ? "(null)" : node,
244 service == NULL ? "(null)" : service,
245 ai_return == EAI_SYSTEM ? strerror (errno) : gai_strerror (ai_return));
249 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
253 if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
255 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
259 if ((se->addr = (struct sockaddr_storage *) malloc (sizeof (struct sockaddr_storage))) == NULL)
261 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
266 assert (sizeof (struct sockaddr_storage) >= ai_ptr->ai_addrlen);
267 memset (se->addr, '\0', sizeof (struct sockaddr_storage));
268 memcpy (se->addr, ai_ptr->ai_addr, ai_ptr->ai_addrlen);
269 se->addrlen = ai_ptr->ai_addrlen;
271 se->mode = operating_mode;
272 se->fd = socket (ai_ptr->ai_family, ai_ptr->ai_socktype, ai_ptr->ai_protocol);
277 syslog (LOG_ERR, "socket: %s", strerror (errno));
283 if (operating_mode == MODE_SERVER)
285 if (network_bind_socket (se, ai_ptr) != 0)
292 else if (operating_mode == MODE_CLIENT)
294 network_set_ttl (se, ai_ptr);
297 if (socklist_tail == NULL)
304 socklist_tail->next = se;
310 /* We don't open more than one write-socket per node/service pair.. */
311 if (operating_mode == MODE_CLIENT)
315 freeaddrinfo (ai_list);
320 static int network_connect_default (void)
324 if (socklist_head != NULL)
327 DBG ("socklist_head is NULL");
331 if (network_create_socket (NET_DEFAULT_V6_ADDR, NET_DEFAULT_PORT) > 0)
334 /* Don't use IPv4 and IPv6 in parallel by default.. */
335 if ((operating_mode == MODE_CLIENT) && (ret != 0))
338 if (network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT) > 0)
347 static int network_get_listen_socket (void)
356 if (socklist_head == NULL)
357 network_connect_default ();
361 for (se = socklist_head; se != NULL; se = se->next)
363 if (se->mode != operating_mode)
366 FD_SET (se->fd, &readfds);
367 if (se->fd >= max_fd)
373 syslog (LOG_WARNING, "No listen sockets found!");
377 status = select (max_fd, &readfds, NULL, NULL, NULL);
382 syslog (LOG_ERR, "select: %s", strerror (errno));
387 for (se = socklist_head; se != NULL; se = se->next)
389 if (se->mode != operating_mode)
392 if (FD_ISSET (se->fd, &readfds))
400 syslog (LOG_WARNING, "No socket ready..?");
406 int network_receive (char **host, char **type, char **inst, char **value)
409 char buffer[BUFF_SIZE];
411 struct sockaddr_storage addr;
417 assert (operating_mode == MODE_SERVER);
424 if ((fd = network_get_listen_socket ()) < 0)
427 addrlen = sizeof (addr);
428 if (recvfrom (fd, buffer, BUFF_SIZE, 0, (struct sockaddr *) &addr, &addrlen) == -1)
430 syslog (LOG_ERR, "recvfrom: %s", strerror (errno));
434 if ((*host = (char *) malloc (BUFF_SIZE)) == NULL)
436 syslog (LOG_EMERG, "malloc: %s", strerror (errno));
440 status = getnameinfo ((struct sockaddr *) &addr, addrlen,
441 *host, BUFF_SIZE, NULL, 0, 0);
444 free (*host); *host = NULL;
445 syslog (LOG_ERR, "getnameinfo: %s",
446 status == EAI_SYSTEM ? strerror (errno) : gai_strerror (status));
450 if (strsplit (buffer, fields, 4) != 3)
452 syslog (LOG_WARNING, "Invalid message from `%s'", *host);
453 free (*host); *host = NULL;
457 if ((*type = strdup (fields[0])) == NULL)
459 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
460 free (*host); *host = NULL;
464 if ((*inst = strdup (fields[1])) == NULL)
466 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
467 free (*host); *host = NULL;
468 free (*type); *type = NULL;
472 if ((*value = strdup (fields[2])) == NULL)
474 syslog (LOG_EMERG, "strdup: %s", strerror (errno));
475 free (*host); *host = NULL;
476 free (*type); *type = NULL;
477 free (*inst); *inst = NULL;
481 DBG ("host = %s, type = %s, inst = %s, value = %s",
482 *host, *type, *inst, *value);
487 int network_send (char *type, char *inst, char *value)
497 DBG ("type = %s, inst = %s, value = %s", type, inst, value);
499 assert (operating_mode == MODE_CLIENT);
501 buflen = snprintf (buf, BUFF_SIZE, "%s %s %s", type, inst, value);
502 if ((buflen >= BUFF_SIZE) || (buflen < 1))
504 syslog (LOG_WARNING, "network_send: snprintf failed..");
510 if (socklist_head == NULL)
511 network_connect_default ();
514 for (se = socklist_head; se != NULL; se = se->next)
516 if (se->mode != operating_mode)
521 status = sendto (se->fd, buf, buflen, 0,
522 (struct sockaddr *) se->addr, se->addrlen);
528 DBG ("sendto was interrupted");
533 syslog (LOG_ERR, "sendto: %s", strerror (errno));
545 syslog (LOG_WARNING, "Message wasn't sent to anybody..");