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 monitor\n");
  34         exit(-1);
  35 }
  36
  37
  38 int accept_tcmsg(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
  39 {
  40         FILE *fp = (FILE*)arg;
  41
  42         if (n->nlmsg_type == RTM_NEWTFILTER || n->nlmsg_type == RTM_DELTFILTER) {
  43                 print_filter(who, n, arg);
  44                 return 0;
  45         }
  46         if (n->nlmsg_type == RTM_NEWTCLASS || n->nlmsg_type == RTM_DELTCLASS) {
  47                 print_class(who, n, arg);
  48                 return 0;
  49         }
  50         if (n->nlmsg_type == RTM_NEWQDISC || n->nlmsg_type == RTM_DELQDISC) {
  51                 print_qdisc(who, n, arg);
  52                 return 0;
  53         }
  54         if (n->nlmsg_type == RTM_GETACTION || n->nlmsg_type == RTM_NEWACTION ||
  55             n->nlmsg_type == RTM_DELACTION) {
  56                 print_action(who, n, arg);
  57                 return 0;
  58         }
  59         if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
  60             n->nlmsg_type != NLMSG_DONE) {
  61                 fprintf(fp, "Unknown message: length %08d type %08x flags %08x\n",
  62                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  63         }
  64         return 0;
  65 }
  66
  67 int do_tcmonitor(int argc, char **argv)
  68 {
  69         struct rtnl_handle rth;
  70         char *file = NULL;
  71         unsigned groups = nl_mgrp(RTNLGRP_TC);
  72
  73         while (argc > 0) {
  74                 if (matches(*argv, "file") == 0) {
  75                         NEXT_ARG();
  76                         file = *argv;
  77                 } else {
  78                         if (matches(*argv, "help") == 0) {
  79                                 usage();
  80                         } else {
  81                                 fprintf(stderr, "Argument \"%s\" is unknown, try \"tc monitor help\".\n", *argv);
  82                                 exit(-1);
  83                         }
  84                 }
  85                 argc--; argv++;
  86         }
  87
  88         if (file) {
  89                 FILE *fp;
  90                 fp = fopen(file, "r");
  91                 if (fp == NULL) {
  92                         perror("Cannot fopen");
  93                         exit(-1);
  94                 }
  95                 return rtnl_from_file(fp, accept_tcmsg, (void*)stdout);
  96         }
  97
  98         if (rtnl_open(&rth, groups) < 0)
  99                 exit(1);
 100
 101         ll_init_map(&rth);
 102
 103         if (rtnl_listen(&rth, accept_tcmsg, (void*)stdout) < 0) {
 104                 rtnl_close(&rth);
 105                 exit(2);
 106         }
 107
 108         rtnl_close(&rth);
 109         exit(0);
 110 }