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main.c revision 1.7 
      1 /* $NetBSD: main.c,v 1.7 2012/11/12 18:39:00 kefren Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2010 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Mihai Chelaru <kefren (at) NetBSD.org>
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <netinet/in.h>
     33 #include <sys/stat.h>
     34 #include <sys/socket.h>
     35 #include <sys/select.h>
     36 #include <arpa/inet.h>
     37 
     38 #include <stdio.h>
     39 #include <stdlib.h>
     40 #include <strings.h>
     41 #include <unistd.h>
     42 
     43 #include "ldp.h"
     44 #include "ldp_command.h"
     45 #include "socketops.h"
     46 #include "tlv.h"
     47 #include "pdu.h"
     48 #include "fsm.h"
     49 #include "ldp_errors.h"
     50 #include "mpls_interface.h"
     51 #include "conffile.h"
     52 
     53 extern int ls;		/* TCP listening socket */
     54 extern int dont_catch;
     55 extern int command_port;
     56 extern int command_socket;
     57 
     58 extern int debug_f, warn_f, syslog_f;
     59 
     60 extern struct sockaddr mplssockaddr;
     61 extern struct in_addr conf_ldp_id;
     62 
     63 void print_usage(char *myself)
     64 {
     65 	printf("\nUsage: %s [-DdfhW] [-c config_file] [-p port]\n\n", myself);
     66 }
     67 
     68 int
     69 main(int argc, char *argv[])
     70 {
     71 	int ch, forkres, dontfork = 0, cpf;
     72 	char conffile[PATH_MAX + 1];
     73 
     74 	strlcpy(conffile, CONFFILE, sizeof(conffile));
     75 	while((ch = getopt(argc, argv, "c:dDfhp:W")) != -1)
     76 		switch(ch) {
     77 		case 'c':
     78 			strlcpy(conffile, optarg, sizeof(conffile));
     79 			break;
     80 		case 'D':
     81 			debug_f = 1;
     82 			break;
     83 		case 'd':
     84 			dont_catch = 1;
     85 			break;
     86 		case 'f':
     87 			dontfork = 1;
     88 			break;
     89 		case 'p':
     90 			if ((command_port = atoi(optarg)) < 1) {
     91 				print_usage(argv[0]);
     92 				return EXIT_FAILURE;
     93 			}
     94 			break;
     95 		case 'W':
     96 			warn_f = 1;
     97 			break;
     98 		case 'h':
     99 		default:
    100 			print_usage(argv[0]);
    101 			return EXIT_FAILURE;
    102 			break;
    103 		}
    104 	if (geteuid()) {
    105 		fatalp("You have to run this as ROOT\n");
    106 		return EXIT_FAILURE;
    107 	}
    108 
    109 	cpf = conf_parsefile(conffile);
    110 	if (cpf < 0 && strcmp(conffile, CONFFILE)) {
    111 		fatalp("Cannot parse config file: %s\n", conffile);
    112 		return EXIT_FAILURE;
    113 	} else if (cpf > 0) {
    114 		fatalp("Cannot parse line %d in config file\n", cpf);
    115 		return EXIT_FAILURE;
    116 	}
    117 
    118 	if (set_my_ldp_id()) {
    119 		fatalp("Cannot set LDP ID\n");
    120 		return EXIT_FAILURE;
    121 	}
    122 	if (conf_ldp_id.s_addr != 0)
    123 		strlcpy(my_ldp_id, inet_ntoa(conf_ldp_id), INET_ADDRSTRLEN);
    124 
    125 	if (mplssockaddr.sa_len == 0) {
    126 		fatalp("You need one mpls interface up and an IP "
    127 		    "address set for it\n");
    128 		return EXIT_FAILURE;
    129 	}
    130 	if (mpls_start_ldp() == -1)
    131 		return EXIT_FAILURE;
    132 	if (!strcmp(LDP_ID, "0.0.0.0")) {
    133 		fatalp("Cannot set my LDP ID.\nAre you sure you've "
    134 		    "got a non-loopback INET interface UP ?\n");
    135 		return EXIT_FAILURE;
    136 	}
    137 	init_command_sockets();
    138 	if ((command_socket = create_command_socket(command_port)) < 1) {
    139 		fatalp("Cannot create command socket\n");
    140 		return EXIT_FAILURE;
    141 	}
    142 	if (create_hello_sockets() != 0) {
    143 		fatalp("Cannot create hello socket\n");
    144 		return EXIT_FAILURE;
    145 	}
    146 
    147 	ls = create_listening_socket();
    148 
    149 	if (ls < 0) {
    150 		fatalp("Cannot create listening socket\n");
    151 		return EXIT_FAILURE;
    152 	}
    153 
    154 	if (dontfork == 1)
    155 		return the_big_loop();
    156 
    157 	forkres = fork();
    158 	if (forkres == 0) {
    159 		syslog_f = 1;
    160 		return the_big_loop();
    161 	}
    162 	if (forkres < 0)
    163 		perror("fork");
    164 
    165 	return EXIT_SUCCESS;
    166 }
    167