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(const struct sockaddr_nl *who,
  38                         struct rtnl_ctrl_data *ctrl,
  39                         struct nlmsghdr *n, void *arg)
  40 {
  41         FILE *fp = (FILE *)arg;
  42
  43         if (timestamp)
  44                 print_timestamp(fp);
  45
  46         if (n->nlmsg_type == RTM_NEWTFILTER || n->nlmsg_type == RTM_DELTFILTER) {
  47                 print_filter(who, n, arg);
  48                 return 0;
  49         }
  50         if (n->nlmsg_type == RTM_NEWTCLASS || n->nlmsg_type == RTM_DELTCLASS) {
  51                 print_class(who, n, arg);
  52                 return 0;
  53         }
  54         if (n->nlmsg_type == RTM_NEWQDISC || n->nlmsg_type == RTM_DELQDISC) {
  55                 print_qdisc(who, n, arg);
  56                 return 0;
  57         }
  58         if (n->nlmsg_type == RTM_GETACTION || n->nlmsg_type == RTM_NEWACTION ||
  59             n->nlmsg_type == RTM_DELACTION) {
  60                 print_action(who, n, arg);
  61                 return 0;
  62         }
  63         if (n->nlmsg_type != NLMSG_ERROR && n->nlmsg_type != NLMSG_NOOP &&
  64             n->nlmsg_type != NLMSG_DONE) {
  65                 fprintf(fp, "Unknown message: length %08d type %08x flags %08x\n",
  66                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  67         }
  68         return 0;
  69 }
  70
  71 int do_tcmonitor(int argc, char **argv)
  72 {
  73         struct rtnl_handle rth;
  74         char *file = NULL;
  75         unsigned int groups = nl_mgrp(RTNLGRP_TC);
  76
  77         while (argc > 0) {
  78                 if (matches(*argv, "file") == 0) {
  79                         NEXT_ARG();
  80                         file = *argv;
  81                 } else {
  82                         if (matches(*argv, "help") == 0) {
  83                                 usage();
  84                         } else {
  85                                 fprintf(stderr, "Argument \"%s\" is unknown, try \"tc monitor help\".\n", *argv);
  86                                 exit(-1);
  87                         }
  88                 }
  89                 argc--; argv++;
  90         }
  91
  92         if (file) {
  93                 FILE *fp = fopen(file, "r");
  94                 int ret;
  95
  96                 if (fp == NULL) {
  97                         perror("Cannot fopen");
  98                         exit(-1);
  99                 }
 100
 101                 ret = rtnl_from_file(fp, accept_tcmsg, stdout);
 102                 fclose(fp);
 103                 return ret;
 104         }
 105
 106         if (rtnl_open(&rth, groups) < 0)
 107                 exit(1);
 108
 109         ll_init_map(&rth);
 110
 111         if (rtnl_listen(&rth, accept_tcmsg, (void *)stdout) < 0) {
 112                 rtnl_close(&rth);
 113                 exit(2);
 114         }
 115
 116         rtnl_close(&rth);
 117         exit(0);
 118 }