mirror of
https://github.com/openvswitch/ovs
synced 2025-10-29 15:28:56 +00:00
129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011, 2013, 2014 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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#include "collectors.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include "socket-util.h"
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#include "sset.h"
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#include "util.h"
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#include "vlog.h"
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VLOG_DEFINE_THIS_MODULE(collectors);
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struct collectors {
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int *fds; /* Sockets. */
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size_t n_fds; /* Number of sockets. */
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};
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/* Opens the targets specified in 'targets' for sending UDP packets. This is
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* useful for e.g. sending NetFlow or sFlow packets. Returns 0 if successful,
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* otherwise a positive errno value if opening at least one collector failed.
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*
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* Each target in 'targets' should be a string in the format "<host>[:<port>]".
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* <port> may be omitted if 'default_port' is nonzero, in which case it
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* defaults to 'default_port'.
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*
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* '*collectorsp' is set to a null pointer if no targets were successfully
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* added, otherwise to a new collectors object if at least one was successfully
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* added. Thus, even on a failure return, it is possible that '*collectorsp'
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* is nonnull, and even on a successful return, it is possible that
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* '*collectorsp' is null, if 'target's is an empty sset. */
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int
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collectors_create(const struct sset *targets, uint16_t default_port,
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struct collectors **collectorsp)
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{
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struct collectors *c;
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const char *name;
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int retval = 0;
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c = xmalloc(sizeof *c);
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c->fds = xmalloc(sizeof *c->fds * sset_count(targets));
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c->n_fds = 0;
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SSET_FOR_EACH (name, targets) {
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int error;
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int fd;
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error = inet_open_active(SOCK_DGRAM, name, default_port, NULL, &fd, 0);
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if (fd >= 0) {
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c->fds[c->n_fds++] = fd;
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} else {
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static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
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VLOG_WARN_RL(&rl, "couldn't open connection to collector %s (%s)",
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name, ovs_strerror(error));
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if (!retval) {
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retval = error;
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}
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}
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}
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if (c->n_fds) {
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*collectorsp = c;
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} else {
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collectors_destroy(c);
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*collectorsp = NULL;
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}
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return retval;
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}
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/* Destroys 'c'. */
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void
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collectors_destroy(struct collectors *c)
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{
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if (c) {
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size_t i;
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for (i = 0; i < c->n_fds; i++) {
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close(c->fds[i]);
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}
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free(c->fds);
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free(c);
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}
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}
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/* Sends the 'n'-byte 'payload' to each of the collectors in 'c'. */
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void
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collectors_send(const struct collectors *c, const void *payload, size_t n)
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{
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if (c) {
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size_t i;
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for (i = 0; i < c->n_fds; i++) {
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static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
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if (send(c->fds[i], payload, n, 0) == -1) {
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char *s = describe_fd(c->fds[i]);
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VLOG_WARN_RL(&rl, "%s: sending to collector failed (%s)",
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s, ovs_strerror(errno));
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free(s);
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}
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}
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}
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}
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int
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collectors_count(const struct collectors *c)
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{
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return c ? c->n_fds : 0;
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}
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