1/* $NetBSD: stdhosts.c,v 1.19 2009/10/20 00:51:14 snj Exp $ */ 2 3/* 4 * Copyright (c) 1994 Mats O Jansson <moj@stacken.kth.se> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 17 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30#ifndef lint 31__RCSID("$NetBSD: stdhosts.c,v 1.19 2009/10/20 00:51:14 snj Exp $"); 32#endif 33 34#include <sys/types.h> 35#include <sys/socket.h> 36#include <netinet/in.h> 37#include <arpa/inet.h> 38#include <ctype.h> 39#include <err.h> 40#include <limits.h> 41#include <stdio.h> 42#include <stdlib.h> 43#include <string.h> 44#include <unistd.h> 45#include <netdb.h> 46 47#include "protos.h" 48 49__dead static void usage(void); 50 51int 52main(int argc, char *argv[]) 53{ 54 struct in_addr host_addr; 55 FILE *data_file; 56 size_t line_no; 57 size_t len; 58 char *line, *k, *v, *addr_string; 59 const char *fname; 60 int ch; 61 int af = 1 << 4; /*IPv4*/ 62 struct addrinfo hints, *res; 63 64 addr_string = NULL; /* XXX gcc -Wuninitialized */ 65 66 while ((ch = getopt(argc, argv, "n")) != -1) { 67 switch (ch) { 68 case 'n': 69 af |= 1 << 6; /*IPv6*/ 70 break; 71 default: 72 usage(); 73 /* NOTREACHED */ 74 } 75 } 76 argc -= optind; 77 argv += optind; 78 79 if (argc > 1) 80 usage(); 81 82 if (argc == 1) { 83 fname = argv[0]; 84 data_file = fopen(fname, "r"); 85 if (data_file == NULL) 86 err(1, "%s", fname); 87 } else { 88 fname = "<stdin>"; 89 data_file = stdin; 90 } 91 92 line_no = 0; 93 for (; 94 (line = fparseln(data_file, &len, &line_no, NULL, 95 FPARSELN_UNESCALL)); 96 free(line)) { 97 if (len == 0) 98 continue; 99 100 v = line; 101 for (k = v; *v && !isspace((unsigned char)*v); v++) 102 ; 103 while (*v && isspace((unsigned char)*v)) 104 *v++ = '\0'; 105 106 memset(&hints, 0, sizeof(hints)); 107 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 108 hints.ai_flags = AI_NUMERICHOST; 109 110 if ((af & (1 << 4)) != 0 && inet_aton(k, &host_addr) == 1 && 111 (addr_string = inet_ntoa(host_addr)) != NULL) { 112 /* IPv4 */ 113 printf("%s %s\n", addr_string, v); 114 } else if ((af & (1 << 6)) != 0 && 115 getaddrinfo(k, "0", &hints, &res) == 0) { 116 /* IPv6, with scope extension permitted */ 117 freeaddrinfo(res); 118 printf("%s %s\n", k, v); 119 } else 120 warnx("%s line %lu: syntax error", fname, 121 (unsigned long)line_no); 122 } 123 124 exit(0); 125} 126 127static void 128usage(void) 129{ 130 131 fprintf(stderr, "usage: %s [-n] [file]\n", getprogname()); 132 exit(1); 133} 134