Home | History | Annotate | Download | only in tc 
      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 }
    111