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stdhosts.c revision 1.17 
      1 /*	$NetBSD: stdhosts.c,v 1.17 2004/10/30 16:01:48 dsl 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  * 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 1.17 2004/10/30 16:01:48 dsl 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, *fname;
     65 	int	 ch;
     66 	int	 af = 1 << 4;	/*IPv4*/
     67 	struct addrinfo hints, *res;
     68 
     69 	addr_string = NULL;		/* XXX gcc -Wuninitialized */
     70 
     71 	while ((ch = getopt(argc, argv, "n")) != -1) {
     72 		switch (ch) {
     73 		case 'n':
     74 			af |= 1 << 6;	/*IPv6*/
     75 			break;
     76 		default:
     77 			usage();
     78 			/* NOTREACHED */
     79 		}
     80 	}
     81 	argc -= optind;
     82 	argv += optind;
     83 
     84 	if (argc > 1)
     85 		usage();
     86 
     87 	if (argc == 1) {
     88 		fname = argv[0];
     89 		data_file = fopen(fname, "r");
     90 		if (data_file == NULL)
     91 			err(1, "%s", fname);
     92 	} else {
     93 		fname = "<stdin>";
     94 		data_file = stdin;
     95 	}
     96 
     97 	line_no = 0;
     98 	for (;
     99 	    (line = fparseln(data_file, &len, &line_no, NULL,
    100 		FPARSELN_UNESCALL));
    101 	    free(line)) {
    102 		if (len == 0)
    103 			continue;
    104 
    105 		v = line;
    106 		for (k = v; *v && !isspace((unsigned char)*v); v++)
    107 			;
    108 		while (*v && isspace((unsigned char)*v))
    109 			*v++ = '\0';
    110 
    111 		memset(&hints, 0, sizeof(hints));
    112 		hints.ai_socktype = SOCK_DGRAM;		/*dummy*/
    113 		hints.ai_flags = AI_NUMERICHOST;
    114 
    115 		if ((af & (1 << 4)) != 0 && inet_aton(k, &host_addr) == 1 &&
    116 		    (addr_string = inet_ntoa(host_addr)) != NULL) {
    117 			/* IPv4 */
    118 			printf("%s %s\n", addr_string, v);
    119 		} else if ((af & (1 << 6)) != 0 &&
    120 			   getaddrinfo(k, "0", &hints, &res) == 0) {
    121 			/* IPv6, with scope extension permitted */
    122 			freeaddrinfo(res);
    123 			printf("%s %s\n", k, v);
    124 		} else
    125 			warnx("%s line %lu: syntax error", fname,
    126 			    (unsigned long)line_no);
    127 	}
    128 
    129 	exit(0);
    130 }
    131 
    132 void
    133 usage(void)
    134 {
    135 
    136 	fprintf(stderr, "usage: %s [-n] [file]\n", getprogname());
    137 	exit(1);
    138 }
    139