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 int main(int, char *[]); 50 void usage(void); 51 52 int 53 main(int argc, char *argv[]) 54 { 55 struct in_addr host_addr; 56 FILE *data_file; 57 size_t line_no; 58 size_t len; 59 char *line, *k, *v, *addr_string; 60 const char *fname; 61 int ch; 62 int af = 1 << 4; /*IPv4*/ 63 struct addrinfo hints, *res; 64 65 addr_string = NULL; /* XXX gcc -Wuninitialized */ 66 67 while ((ch = getopt(argc, argv, "n")) != -1) { 68 switch (ch) { 69 case 'n': 70 af |= 1 << 6; /*IPv6*/ 71 break; 72 default: 73 usage(); 74 /* NOTREACHED */ 75 } 76 } 77 argc -= optind; 78 argv += optind; 79 80 if (argc > 1) 81 usage(); 82 83 if (argc == 1) { 84 fname = argv[0]; 85 data_file = fopen(fname, "r"); 86 if (data_file == NULL) 87 err(1, "%s", fname); 88 } else { 89 fname = "<stdin>"; 90 data_file = stdin; 91 } 92 93 line_no = 0; 94 for (; 95 (line = fparseln(data_file, &len, &line_no, NULL, 96 FPARSELN_UNESCALL)); 97 free(line)) { 98 if (len == 0) 99 continue; 100 101 v = line; 102 for (k = v; *v && !isspace((unsigned char)*v); v++) 103 ; 104 while (*v && isspace((unsigned char)*v)) 105 *v++ = '\0'; 106 107 memset(&hints, 0, sizeof(hints)); 108 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 109 hints.ai_flags = AI_NUMERICHOST; 110 111 if ((af & (1 << 4)) != 0 && inet_aton(k, &host_addr) == 1 && 112 (addr_string = inet_ntoa(host_addr)) != NULL) { 113 /* IPv4 */ 114 printf("%s %s\n", addr_string, v); 115 } else if ((af & (1 << 6)) != 0 && 116 getaddrinfo(k, "0", &hints, &res) == 0) { 117 /* IPv6, with scope extension permitted */ 118 freeaddrinfo(res); 119 printf("%s %s\n", k, v); 120 } else 121 warnx("%s line %lu: syntax error", fname, 122 (unsigned long)line_no); 123 } 124 125 exit(0); 126 } 127 128 void 129 usage(void) 130 { 131 132 fprintf(stderr, "usage: %s [-n] [file]\n", getprogname()); 133 exit(1); 134 } 135