tc/tc_monitor.c

   1 /*
   2  * tc_monitor.c         "tc monitor".
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Jamal Hadi Salim
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <syslog.h>
  17 #include <fcntl.h>
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <string.h>
  22 #include <time.h>
  23 #include "rt_names.h"
  24 #include "utils.h"
  25 #include "tc_util.h"
  26 #include "tc_common.h"
  27
  28
  29 static void usage(void) __attribute__((noreturn));
  30
  31 static void usage(void)
  32 {
  33         fprintf(stderr, "Usage: tc [-timestamp [-tshort] monitor\n");
  34         exit(-1);
  35 }
  36
  37
  38 static int accept_tcmsg(const struct sockaddr_nl *who,
  39                         struct rtnl_ctrl_data *ctrl,
  40                         struct nlmsghdr *n, void *arg)
  41 {
  42         FILE *fp = (FILE*)arg;
  43
  44         if (timestamp)
  45                 print_timestamp(fp);
  46
  47         if (n->nlmsg_type == RTM_NEWTFILTER || n->nlmsg_type == RTM_DELTFILTER) {
  48                 print_filter(who, n, arg);
  49                 return 0;
  50         }
  51         if (n->nlmsg_type == RTM_NEWTCLASS || n->nlmsg_type == RTM_DELTCLASS) {
  52                 print_class(who, n, arg);
  53                 return 0;
  54         }
  55         if (n->nlmsg_type == RTM_NEWQDISC || n->nlmsg_type == RTM_DELQDISC) {
  56                 print_qdisc(who, n, arg);
  57                 return 0;
  58         }
  59         if (n->nlmsg_type == RTM_GETACTION || n->nlmsg_type == RTM_NEWACTION ||
  60             n->nlmsg_type == RTM_DELACTION) {
  61                 print_action(who, n, arg);
  62                 return 0;
  63         }
  64         if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
  65             n->nlmsg_type != NLMSG_DONE) {
  66                 fprintf(fp, "Unknown message: length %08d type %08x flags %08x\n",
  67                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  68         }
  69         return 0;
  70 }
  71
  72 int do_tcmonitor(int argc, char **argv)
  73 {
  74         struct rtnl_handle rth;
  75         char *file = NULL;
  76         unsigned groups = nl_mgrp(RTNLGRP_TC);
  77
  78         while (argc > 0) {
  79                 if (matches(*argv, "file") == 0) {
  80                         NEXT_ARG();
  81                         file = *argv;
  82                 } else {
  83                         if (matches(*argv, "help") == 0) {
  84                                 usage();
  85                         } else {
  86                                 fprintf(stderr, "Argument \"%s\" is unknown, try \"tc monitor help\".\n", *argv);
  87                                 exit(-1);
  88                         }
  89                 }
  90                 argc--; argv++;
  91         }
  92
  93         if (file) {
  94                 FILE *fp;
  95                 fp = fopen(file, "r");
  96                 if (fp == NULL) {
  97                         perror("Cannot fopen");
  98                         exit(-1);
  99                 }
 100                 return rtnl_from_file(fp, accept_tcmsg, (void*)stdout);
 101         }
 102
 103         if (rtnl_open(&rth, groups) < 0)
 104                 exit(1);
 105
 106         ll_init_map(&rth);
 107
 108         if (rtnl_listen(&rth, accept_tcmsg, (void*)stdout) < 0) {
 109                 rtnl_close(&rth);
 110                 exit(2);
 111         }
 112
 113         rtnl_close(&rth);
 114         exit(0);
 115 }