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      1 /* $NetBSD: main.c,v 1.9 2013/07/31 06:58:23 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 <arpa/inet.h>
     36 
     37 #include <stdio.h>
     38 #include <stdlib.h>
     39 #include <strings.h>
     40 #include <unistd.h>
     41 
     42 #include "ldp.h"
     43 #include "ldp_command.h"
     44 #include "socketops.h"
     45 #include "tlv.h"
     46 #include "pdu.h"
     47 #include "fsm.h"
     48 #include "ldp_errors.h"
     49 #include "mpls_interface.h"
     50 #include "conffile.h"
     51 
     52 extern int ls;		/* TCP listening socket */
     53 extern int dont_catch;
     54 extern int command_port;
     55 extern int command_socket;
     56 
     57 extern int debug_f, warn_f, syslog_f;
     58 
     59 extern struct sockaddr mplssockaddr;
     60 extern struct in_addr conf_ldp_id;
     61 
     62 void print_usage(char *myself)
     63 {
     64 	printf("\nUsage: %s [-DdfhW] [-c config_file] [-p port]\n\n", myself);
     65 }
     66 
     67 int
     68 main(int argc, char *argv[])
     69 {
     70 	int ch, forkres, dontfork = 0, cpf;
     71 	char conffile[PATH_MAX + 1];
     72 
     73 	strlcpy(conffile, CONFFILE, sizeof(conffile));
     74 	while((ch = getopt(argc, argv, "c:dDfhp:W")) != -1)
     75 		switch(ch) {
     76 		case 'c':
     77 			strlcpy(conffile, optarg, sizeof(conffile));
     78 			break;
     79 		case 'D':
     80 			debug_f = 1;
     81 			break;
     82 		case 'd':
     83 			dont_catch = 1;
     84 			break;
     85 		case 'f':
     86 			dontfork = 1;
     87 			break;
     88 		case 'p':
     89 			if ((command_port = atoi(optarg)) < 1) {
     90 				print_usage(argv[0]);
     91 				return EXIT_FAILURE;
     92 			}
     93 			break;
     94 		case 'W':
     95 			warn_f = 1;
     96 			break;
     97 		case 'h':
     98 		default:
     99 			print_usage(argv[0]);
    100 			return EXIT_FAILURE;
    101 			break;
    102 		}
    103 
    104 	cpf = conf_parsefile(conffile);
    105 	if (cpf < 0 && strcmp(conffile, CONFFILE)) {
    106 		fatalp("Cannot parse config file: %s\n", conffile);
    107 		return EXIT_FAILURE;
    108 	} else if (cpf > 0) {
    109 		fatalp("Cannot parse line %d in config file\n", cpf);
    110 		return EXIT_FAILURE;
    111 	}
    112 
    113 	if (set_my_ldp_id()) {
    114 		fatalp("Cannot set LDP ID\n");
    115 		return EXIT_FAILURE;
    116 	}
    117 	if (conf_ldp_id.s_addr != 0)
    118 		strlcpy(my_ldp_id, inet_ntoa(conf_ldp_id), INET_ADDRSTRLEN);
    119 
    120 	if (mplssockaddr.sa_len == 0) {
    121 		fatalp("FATAL: Create an mpls interface using ifconfig\n"
    122 		    "e.g. ifconfig mpls0 create up\n");
    123 		return EXIT_FAILURE;
    124 	}
    125 	if (mpls_start_ldp() == -1)
    126 		return EXIT_FAILURE;
    127 	if (!strcmp(LDP_ID, "0.0.0.0")) {
    128 		fatalp("Cannot set my LDP ID.\nAre you sure you've "
    129 		    "got a non-loopback INET interface UP ?\n");
    130 		return EXIT_FAILURE;
    131 	}
    132 	init_command_sockets();
    133 	if ((command_socket = create_command_socket(command_port)) < 1) {
    134 		fatalp("Cannot create command socket\n");
    135 		return EXIT_FAILURE;
    136 	}
    137 	if (create_hello_sockets() != 0) {
    138 		fatalp("Cannot create hello socket\n");
    139 		return EXIT_FAILURE;
    140 	}
    141 
    142 	ls = create_listening_socket();
    143 
    144 	if (ls < 0) {
    145 		fatalp("Cannot create listening socket\n");
    146 		return EXIT_FAILURE;
    147 	}
    148 
    149 	if (dontfork == 1)
    150 		return the_big_loop();
    151 
    152 	forkres = fork();
    153 	if (forkres == 0) {
    154 		syslog_f = 1;
    155 		return the_big_loop();
    156 	}
    157 	if (forkres < 0)
    158 		perror("fork");
    159 
    160 	return EXIT_SUCCESS;
    161 }
    162