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      1 /*	$NetBSD: stdhosts.c,v 1.20 2011/08/30 21:10:29 joerg Exp $	 */
      2 
      3 /*
      4  * Copyright (c) 1994 Mats O Jansson <moj (at) 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 1.20 2011/08/30 21:10:29 joerg 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 
     51 int
     52 main(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 
    127 static void
    128 usage(void)
    129 {
    130 
    131 	fprintf(stderr, "usage: %s [-n] [file]\n", getprogname());
    132 	exit(1);
    133 }
    134