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stdhosts.c revision 1.18 
      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 (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 1.18 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