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