src/nl-monitor.c

   1 /*
   2  * src/nl-monitor.c     Monitor events
   3  *
   4  *      This library is free software; you can redistribute it and/or
   5  *      modify it under the terms of the GNU Lesser General Public
   6  *      License as published by the Free Software Foundation version 2.1
   7  *      of the License.
   8  *
   9  * Copyright (c) 2003-2009 Thomas Graf <tgraf@suug.ch>
  10  */
  11
  12 #include <netlink/cli/utils.h>
  13 #include <netlink/cli/link.h>
  14
  15 static void obj_input(struct nl_object *obj, void *arg)
  16 {
  17         struct nl_dump_params dp = {
  18                 .dp_type = NL_DUMP_STATS,
  19                 .dp_fd = stdout,
  20                 .dp_dump_msgtype = 1,
  21         };
  22
  23         nl_object_dump(obj, &dp);
  24 }
  25
  26 static int event_input(struct nl_msg *msg, void *arg)
  27 {
  28         if (nl_msg_parse(msg, &obj_input, NULL) < 0)
  29                 fprintf(stderr, "<<EVENT>> Unknown message type\n");
  30
  31         /* Exit nl_recvmsgs_def() and return to the main select() */
  32         return NL_STOP;
  33 }
  34
  35 int main(int argc, char *argv[])
  36 {
  37         struct nl_sock *sock;
  38         struct nl_cache *link_cache;
  39         int err = 1;
  40         int i, idx;
  41
  42         static const struct {
  43                 enum rtnetlink_groups gr_id;
  44                 const char* gr_name;
  45         } known_groups[] = {
  46                 { RTNLGRP_LINK, "link" },
  47                 { RTNLGRP_NOTIFY, "notify" },
  48                 { RTNLGRP_NEIGH, "neigh" },
  49                 { RTNLGRP_TC, "tc" },
  50                 { RTNLGRP_IPV4_IFADDR, "ipv4-ifaddr" },
  51                 { RTNLGRP_IPV4_MROUTE, "ipv4-mroute" },
  52                 { RTNLGRP_IPV4_ROUTE, "ipv4-route" },
  53                 { RTNLGRP_IPV6_IFADDR, "ipv6-ifaddr" },
  54                 { RTNLGRP_IPV6_MROUTE, "ipv6-mroute" },
  55                 { RTNLGRP_IPV6_ROUTE, "ipv6-route" },
  56                 { RTNLGRP_IPV6_IFINFO, "ipv6-ifinfo" },
  57                 { RTNLGRP_DECnet_IFADDR, "decnet-ifaddr" },
  58                 { RTNLGRP_DECnet_ROUTE, "decnet-route" },
  59                 { RTNLGRP_IPV6_PREFIX, "ipv6-prefix" },
  60                 { RTNLGRP_NONE, NULL }
  61         };
  62
  63         sock = nl_cli_alloc_socket();
  64         nl_socket_disable_seq_check(sock);
  65         nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, event_input, NULL);
  66
  67         if (argc > 1 && !strcasecmp(argv[1], "-h")) {
  68                 printf("Usage: nl-monitor [<groups>]\n");
  69
  70                 printf("Known groups:");
  71                 for (i = 0; known_groups[i].gr_id != RTNLGRP_NONE; i++)
  72                         printf(" %s", known_groups[i].gr_name);
  73                 printf("\n");
  74                 return 2;
  75         }
  76
  77         nl_cli_connect(sock, NETLINK_ROUTE);
  78
  79         for (idx = 1; argc > idx; idx++) {
  80                 for (i = 0; known_groups[i].gr_id != RTNLGRP_NONE; i++) {
  81                         if (!strcmp(argv[idx], known_groups[i].gr_name)) {
  82
  83                                 if ((err = nl_socket_add_membership(sock, known_groups[i].gr_id)) < 0) {
  84                                         nl_cli_fatal(err, "%s: %s\n", argv[idx],
  85                                                      nl_geterror(err));
  86                                 }
  87
  88                                 break;
  89                         }
  90                 }
  91                 if (known_groups[i].gr_id == RTNLGRP_NONE)
  92                         fprintf(stderr, "Warning: Unknown group: %s\n", argv[idx]);
  93         }
  94
  95         link_cache = nl_cli_link_alloc_cache(sock);
  96
  97         while (1) {
  98                 fd_set rfds;
  99                 int fd, retval;
 100
 101                 fd = nl_socket_get_fd(sock);
 102
 103                 FD_ZERO(&rfds);
 104                 FD_SET(fd, &rfds);
 105                 /* wait for an incoming message on the netlink socket */
 106                 retval = select(fd+1, &rfds, NULL, NULL, NULL);
 107
 108                 if (retval) {
 109                         /* FD_ISSET(fd, &rfds) will be true */
 110                         nl_recvmsgs_default(sock);
 111                 }
 112         }
 113
 114         return 0;
 115 }