2 * Copyright (c) 2008, 2009 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include "collectors.h"
25 #include "socket-util.h"
29 #define THIS_MODULE VLM_collectors
33 int *fds; /* Sockets. */
34 size_t n_fds; /* Number of sockets. */
37 /* Opens the targets specified in 'targets' for sending UDP packets. This is
38 * useful for e.g. sending NetFlow or sFlow packets. Returns 0 if successful,
39 * otherwise a positive errno value if opening at least one collector failed.
41 * Each target in 'targets' should be a string in the format "<host>[:<port>]".
42 * <port> may be omitted if 'default_port' is nonzero, in which case it
43 * defaults to 'default_port'.
45 * '*collectorsp' is set to a null pointer if no targets were successfully
46 * added, otherwise to a new collectors object if at least one was successfully
47 * added. Thus, even on a failure return, it is possible that '*collectorsp'
48 * is nonnull, and even on a successful return, it is possible that
49 * '*collectorsp' is null, if 'target's is an empty svec. */
51 collectors_create(const struct svec *targets_, uint16_t default_port,
52 struct collectors **collectorsp)
59 svec_clone(&targets, targets_);
60 svec_sort_unique(&targets);
62 c = xmalloc(sizeof *c);
63 c->fds = xmalloc(sizeof *c->fds * targets.n);
65 for (i = 0; i < targets.n; i++) {
66 const char *name = targets.names[i];
70 error = inet_open_active(SOCK_DGRAM, name, default_port, NULL, &fd);
72 c->fds[c->n_fds++] = fd;
74 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
76 VLOG_WARN_RL(&rl, "couldn't open connection to collector %s (%s)",
77 name, strerror(error));
83 svec_destroy(&targets);
88 collectors_destroy(c);
97 collectors_destroy(struct collectors *c)
102 for (i = 0; i < c->n_fds; i++) {
110 /* Sends the 'n'-byte 'payload' to each of the collectors in 'c'. */
112 collectors_send(const struct collectors *c, const void *payload, size_t n)
117 for (i = 0; i < c->n_fds; i++) {
118 static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
119 if (send(c->fds[i], payload, n, 0) == -1) {
120 VLOG_WARN_RL(&rl, "sending to collector failed: %s",
128 collectors_count(const struct collectors *c)
130 return c ? c->n_fds : 0;