ofproto/collectors.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2011, 2013, 2014 Nicira, Inc.
   3  *
   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:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  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.
  15  */
  16
  17 #include <config.h>
  18
  19 #include "collectors.h"
  20
  21 #include <errno.h>
  22 #include <stdlib.h>
  23 #include <sys/socket.h>
  24 #include <unistd.h>
  25
  26 #include "socket-util.h"
  27 #include "sset.h"
  28 #include "util.h"
  29 #include "openvswitch/vlog.h"
  30
  31 VLOG_DEFINE_THIS_MODULE(collectors);
  32
  33 struct collectors {
  34     int *fds;                     /* Sockets. */
  35     size_t n_fds;                 /* Number of sockets. */
  36 };
  37
  38 /* Opens the targets specified in 'targets' for sending UDP packets.  This is
  39  * useful for e.g. sending NetFlow or sFlow packets.  Returns 0 if successful,
  40  * otherwise a positive errno value if opening at least one collector failed.
  41  *
  42  * Each target in 'targets' should be a string in the format "<host>[:<port>]".
  43  * <port> may be omitted if 'default_port' is nonnegative, in which case it
  44  * defaults to 'default_port'.
  45  *
  46  * '*collectorsp' is set to a null pointer if no targets were successfully
  47  * added, otherwise to a new collectors object if at least one was successfully
  48  * added.  Thus, even on a failure return, it is possible that '*collectorsp'
  49  * is nonnull, and even on a successful return, it is possible that
  50  * '*collectorsp' is null, if 'target's is an empty sset. */
  51 int
  52 collectors_create(const struct sset *targets, int default_port,
  53                   struct collectors **collectorsp)
  54 {
  55     struct collectors *c;
  56     const char *name;
  57     int retval = 0;
  58
  59     c = xmalloc(sizeof *c);
  60     c->fds = xmalloc(sizeof *c->fds * sset_count(targets));
  61     c->n_fds = 0;
  62     SSET_FOR_EACH (name, targets) {
  63         int error;
  64         int fd;
  65
  66         error = inet_open_active(SOCK_DGRAM, name, default_port, NULL, &fd, 0);
  67         if (fd >= 0) {
  68             c->fds[c->n_fds++] = fd;
  69         } else {
  70             static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
  71
  72             VLOG_WARN_RL(&rl, "couldn't open connection to collector %s (%s)",
  73                          name, ovs_strerror(error));
  74             if (!retval) {
  75                 retval = error;
  76             }
  77         }
  78     }
  79
  80     if (c->n_fds) {
  81         *collectorsp = c;
  82     } else {
  83         collectors_destroy(c);
  84         *collectorsp = NULL;
  85     }
  86
  87     return retval;
  88 }
  89
  90 /* Destroys 'c'. */
  91 void
  92 collectors_destroy(struct collectors *c)
  93 {
  94     if (c) {
  95         size_t i;
  96
  97         for (i = 0; i < c->n_fds; i++) {
  98             closesocket(c->fds[i]);
  99         }
 100         free(c->fds);
 101         free(c);
 102     }
 103 }
 104
 105 /* Sends the 'n'-byte 'payload' to each of the collectors in 'c'.
 106  * Return the number of IPFIX packets which were sent unsuccessfully*/
 107 size_t
 108 collectors_send(const struct collectors *c, const void *payload, size_t n)
 109 {
 110     size_t errors = 0;
 111
 112     if (c) {
 113         size_t i;
 114
 115         for (i = 0; i < c->n_fds; i++) {
 116             static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
 117             if (send(c->fds[i], payload, n, 0) == -1) {
 118                 char *s = describe_fd(c->fds[i]);
 119                 VLOG_WARN_RL(&rl, "%s: sending to collector failed (%s)",
 120                              s, ovs_strerror(errno));
 121                 free(s);
 122                 errors++;
 123             }
 124         }
 125     }
 126
 127     return errors;
 128 }
 129
 130 int
 131 collectors_count(const struct collectors *c)
 132 {
 133     return c ? c->n_fds : 0;
 134 }