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 <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <string.h>
  21 #include <time.h>
  22 #include "rt_names.h"
  23 #include "utils.h"
  24 #include "tc_util.h"
  25 #include "tc_common.h"
  26
  27
  28 static void usage(void) __attribute__((noreturn));
  29
  30 static void usage(void)
  31 {
  32         fprintf(stderr, "Usage: tc [-timestamp [-tshort] monitor\n");
  33         exit(-1);
  34 }
  35
  36
  37 static int accept_tcmsg(struct rtnl_ctrl_data *ctrl,
  38                         struct nlmsghdr *n, void *arg)
  39 {
  40         FILE *fp = (FILE *)arg;
  41
  42         if (timestamp)
  43                 print_timestamp(fp);
  44
  45         if (n->nlmsg_type == RTM_NEWTFILTER ||
  46             n->nlmsg_type == RTM_DELTFILTER ||
  47             n->nlmsg_type == RTM_NEWCHAIN ||
  48             n->nlmsg_type == RTM_DELCHAIN) {
  49                 print_filter(n, arg);
  50                 return 0;
  51         }
  52         if (n->nlmsg_type == RTM_NEWTCLASS || n->nlmsg_type == RTM_DELTCLASS) {
  53                 print_class(n, arg);
  54                 return 0;
  55         }
  56         if (n->nlmsg_type == RTM_NEWQDISC || n->nlmsg_type == RTM_DELQDISC) {
  57                 print_qdisc(n, arg);
  58                 return 0;
  59         }
  60         if (n->nlmsg_type == RTM_GETACTION || n->nlmsg_type == RTM_NEWACTION ||
  61             n->nlmsg_type == RTM_DELACTION) {
  62                 print_action(n, arg);
  63                 return 0;
  64         }
  65         if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
  66             n->nlmsg_type != NLMSG_DONE) {
  67                 fprintf(fp, "Unknown message: length %08d type %08x flags %08x\n",
  68                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  69         }
  70         return 0;
  71 }
  72
  73 int do_tcmonitor(int argc, char **argv)
  74 {
  75         struct rtnl_handle rth;
  76         char *file = NULL;
  77         unsigned int groups = nl_mgrp(RTNLGRP_TC);
  78
  79         while (argc > 0) {
  80                 if (matches(*argv, "file") == 0) {
  81                         NEXT_ARG();
  82                         file = *argv;
  83                 } else {
  84                         if (matches(*argv, "help") == 0) {
  85                                 usage();
  86                         } else {
  87                                 fprintf(stderr, "Argument \"%s\" is unknown, try \"tc monitor help\".\n", *argv);
  88                                 exit(-1);
  89                         }
  90                 }
  91                 argc--; argv++;
  92         }
  93
  94         if (file) {
  95                 FILE *fp = fopen(file, "r");
  96                 int ret;
  97
  98                 if (fp == NULL) {
  99                         perror("Cannot fopen");
 100                         exit(-1);
 101                 }
 102
 103                 ret = rtnl_from_file(fp, accept_tcmsg, stdout);
 104                 fclose(fp);
 105                 return ret;
 106         }
 107
 108         if (rtnl_open(&rth, groups) < 0)
 109                 exit(1);
 110
 111         ll_init_map(&rth);
 112
 113         if (rtnl_listen(&rth, accept_tcmsg, (void *)stdout) < 0) {
 114                 rtnl_close(&rth);
 115                 exit(2);
 116         }
 117
 118         rtnl_close(&rth);
 119         exit(0);
 120 }