1 /* $NetBSD: stdhosts.c,v 1.18 2009/04/19 06:06:40 lukem 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Mats O Jansson 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 22 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifndef lint 36 __RCSID("$NetBSD: stdhosts.c,v 1.18 2009/04/19 06:06:40 lukem Exp $"); 37 #endif 38 39 #include <sys/types.h> 40 #include <sys/socket.h> 41 #include <netinet/in.h> 42 #include <arpa/inet.h> 43 #include <ctype.h> 44 #include <err.h> 45 #include <limits.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 #include <netdb.h> 51 52 #include "protos.h" 53 54 int main(int, char *[]); 55 void usage(void); 56 57 int 58 main(int argc, char *argv[]) 59 { 60 struct in_addr host_addr; 61 FILE *data_file; 62 size_t line_no; 63 size_t len; 64 char *line, *k, *v, *addr_string; 65 const char *fname; 66 int ch; 67 int af = 1 << 4; /*IPv4*/ 68 struct addrinfo hints, *res; 69 70 addr_string = NULL; /* XXX gcc -Wuninitialized */ 71 72 while ((ch = getopt(argc, argv, "n")) != -1) { 73 switch (ch) { 74 case 'n': 75 af |= 1 << 6; /*IPv6*/ 76 break; 77 default: 78 usage(); 79 /* NOTREACHED */ 80 } 81 } 82 argc -= optind; 83 argv += optind; 84 85 if (argc > 1) 86 usage(); 87 88 if (argc == 1) { 89 fname = argv[0]; 90 data_file = fopen(fname, "r"); 91 if (data_file == NULL) 92 err(1, "%s", fname); 93 } else { 94 fname = "<stdin>"; 95 data_file = stdin; 96 } 97 98 line_no = 0; 99 for (; 100 (line = fparseln(data_file, &len, &line_no, NULL, 101 FPARSELN_UNESCALL)); 102 free(line)) { 103 if (len == 0) 104 continue; 105 106 v = line; 107 for (k = v; *v && !isspace((unsigned char)*v); v++) 108 ; 109 while (*v && isspace((unsigned char)*v)) 110 *v++ = '\0'; 111 112 memset(&hints, 0, sizeof(hints)); 113 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 114 hints.ai_flags = AI_NUMERICHOST; 115 116 if ((af & (1 << 4)) != 0 && inet_aton(k, &host_addr) == 1 && 117 (addr_string = inet_ntoa(host_addr)) != NULL) { 118 /* IPv4 */ 119 printf("%s %s\n", addr_string, v); 120 } else if ((af & (1 << 6)) != 0 && 121 getaddrinfo(k, "0", &hints, &res) == 0) { 122 /* IPv6, with scope extension permitted */ 123 freeaddrinfo(res); 124 printf("%s %s\n", k, v); 125 } else 126 warnx("%s line %lu: syntax error", fname, 127 (unsigned long)line_no); 128 } 129 130 exit(0); 131 } 132 133 void 134 usage(void) 135 { 136 137 fprintf(stderr, "usage: %s [-n] [file]\n", getprogname()); 138 exit(1); 139 } 140