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      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 int 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 = fopen(file, "r");
     95 		int ret;
     96 
     97 		if (fp == NULL) {
     98 			perror("Cannot fopen");
     99 			exit(-1);
    100 		}
    101 
    102 		ret = rtnl_from_file(fp, accept_tcmsg, stdout);
    103 		fclose(fp);
    104 		return ret;
    105 	}
    106 
    107 	if (rtnl_open(&rth, groups) < 0)
    108 		exit(1);
    109 
    110 	ll_init_map(&rth);
    111 
    112 	if (rtnl_listen(&rth, accept_tcmsg, (void *)stdout) < 0) {
    113 		rtnl_close(&rth);
    114 		exit(2);
    115 	}
    116 
    117 	rtnl_close(&rth);
    118 	exit(0);
    119 }
    120