1 /* $OpenBSD: gethostnamadr.c,v 1.3 2018/12/15 15:16:12 eric Exp $ */ 2 /* 3 * Copyright (c) 2012 Eric Faurot <eric@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 #include <sys/types.h> 18 #include <sys/socket.h> 19 #include <netinet/in.h> 20 #include <arpa/inet.h> 21 22 #include <err.h> 23 #include <errno.h> 24 #include <getopt.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <string.h> 28 29 #include "common.h" 30 31 static void 32 usage(void) 33 { 34 extern const char * __progname; 35 36 fprintf(stderr, "usage: %s [-46e] <host...>\n", __progname); 37 exit(1); 38 } 39 40 int 41 main(int argc, char *argv[]) 42 { 43 int i, ch, aflag, family = AF_INET; 44 struct hostent *h; 45 char *host; 46 char addr[16]; 47 int addrlen; 48 49 aflag = 0; 50 while((ch = getopt(argc, argv, "46R:ae")) != -1) { 51 switch(ch) { 52 case '4': 53 family = AF_INET; 54 break; 55 case '6': 56 family = AF_INET6; 57 break; 58 case 'R': 59 parseresopt(optarg); 60 break; 61 case 'a': 62 aflag = 1; 63 break; 64 case 'e': 65 long_err += 1; 66 break; 67 default: 68 usage(); 69 /* NOTREACHED */ 70 } 71 } 72 argc -= optind; 73 argv += optind; 74 75 for(i = 0; i < argc; i++) { 76 77 if (i) 78 printf("\n"); 79 printf("===> \"%s\"\n", argv[i]); 80 host = gethostarg(argv[i]); 81 82 if (aflag && addr_from_str(addr, &family, &addrlen, host) == -1) 83 errx(1, "bad address"); 84 85 errno = 0; 86 h_errno = 0; 87 gai_errno = 0; 88 rrset_errno = 0; 89 90 if (aflag == 0) 91 h = gethostbyname2(host, family); 92 else 93 h = gethostbyaddr(addr, addrlen, family); 94 if (h) 95 print_hostent(h); 96 print_errors(); 97 } 98 99 return (0); 100 } 101 102 int 103 addr_from_str(char *addr, int *family, int *len, const char *src) 104 { 105 if (inet_pton(AF_INET6, src, addr) == 1) { 106 *family = AF_INET6; 107 *len = 16; 108 return (0); 109 } 110 if (inet_pton(AF_INET, src, addr) == 1) { 111 *family = AF_INET; 112 *len = 4; 113 return (0); 114 } 115 return (-1); 116 } 117