| 1 |  |  | /*	$OpenBSD: getnetent.c,v 1.17 2015/01/16 18:20:14 millert Exp $ */ | 
    
    | 2 |  |  | /* | 
    
    | 3 |  |  |  * Copyright (c) 1983, 1993 | 
    
    | 4 |  |  |  *	The Regents of the University of California.  All rights reserved. | 
    
    | 5 |  |  |  * | 
    
    | 6 |  |  |  * Redistribution and use in source and binary forms, with or without | 
    
    | 7 |  |  |  * modification, are permitted provided that the following conditions | 
    
    | 8 |  |  |  * are met: | 
    
    | 9 |  |  |  * 1. Redistributions of source code must retain the above copyright | 
    
    | 10 |  |  |  *    notice, this list of conditions and the following disclaimer. | 
    
    | 11 |  |  |  * 2. Redistributions in binary form must reproduce the above copyright | 
    
    | 12 |  |  |  *    notice, this list of conditions and the following disclaimer in the | 
    
    | 13 |  |  |  *    documentation and/or other materials provided with the distribution. | 
    
    | 14 |  |  |  * 3. Neither the name of the University nor the names of its contributors | 
    
    | 15 |  |  |  *    may be used to endorse or promote products derived from this software | 
    
    | 16 |  |  |  *    without specific prior written permission. | 
    
    | 17 |  |  |  * | 
    
    | 18 |  |  |  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | 
    
    | 19 |  |  |  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | 
    
    | 20 |  |  |  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | 
    
    | 21 |  |  |  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | 
    
    | 22 |  |  |  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | 
    
    | 23 |  |  |  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | 
    
    | 24 |  |  |  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | 
    
    | 25 |  |  |  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | 
    
    | 26 |  |  |  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | 
    
    | 27 |  |  |  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | 
    
    | 28 |  |  |  * SUCH DAMAGE. | 
    
    | 29 |  |  |  */ | 
    
    | 30 |  |  |  | 
    
    | 31 |  |  | #include <sys/socket.h> | 
    
    | 32 |  |  | #include <netinet/in.h> | 
    
    | 33 |  |  | #include <arpa/inet.h> | 
    
    | 34 |  |  | #include <netdb.h> | 
    
    | 35 |  |  | #include <stdio.h> | 
    
    | 36 |  |  | #include <string.h> | 
    
    | 37 |  |  | #include <limits.h> | 
    
    | 38 |  |  |  | 
    
    | 39 |  |  | #define	MAXALIASES	35 | 
    
    | 40 |  |  |  | 
    
    | 41 |  |  | static FILE *netf; | 
    
    | 42 |  |  | static char line[BUFSIZ+1]; | 
    
    | 43 |  |  | static struct netent net; | 
    
    | 44 |  |  | static char *net_aliases[MAXALIASES]; | 
    
    | 45 |  |  | int _net_stayopen; | 
    
    | 46 |  |  |  | 
    
    | 47 |  |  | void | 
    
    | 48 |  |  | setnetent(int f) | 
    
    | 49 |  |  | { | 
    
    | 50 |  |  | 	if (netf == NULL) | 
    
    | 51 |  |  | 		netf = fopen(_PATH_NETWORKS, "re" ); | 
    
    | 52 |  |  | 	else | 
    
    | 53 |  |  | 		rewind(netf); | 
    
    | 54 |  |  | 	_net_stayopen |= f; | 
    
    | 55 |  |  | } | 
    
    | 56 |  |  |  | 
    
    | 57 |  |  | void | 
    
    | 58 |  |  | endnetent(void) | 
    
    | 59 |  |  | { | 
    
    | 60 |  |  | 	if (netf) { | 
    
    | 61 |  |  | 		fclose(netf); | 
    
    | 62 |  |  | 		netf = NULL; | 
    
    | 63 |  |  | 	} | 
    
    | 64 |  |  | 	_net_stayopen = 0; | 
    
    | 65 |  |  | } | 
    
    | 66 |  |  |  | 
    
    | 67 |  |  | struct netent * | 
    
    | 68 |  |  | getnetent(void) | 
    
    | 69 |  |  | { | 
    
    | 70 |  |  | 	char *p, *cp, **q; | 
    
    | 71 |  |  | 	size_t len; | 
    
    | 72 |  |  |  | 
    
    | 73 |  |  | 	if (netf == NULL && (netf = fopen(_PATH_NETWORKS, "re" )) == NULL) | 
    
    | 74 |  |  | 		return (NULL); | 
    
    | 75 |  |  | again: | 
    
    | 76 |  |  | 	if ((p = fgetln(netf, &len)) == NULL) | 
    
    | 77 |  |  | 		return (NULL); | 
    
    | 78 |  |  | 	if (p[len-1] == '\n') | 
    
    | 79 |  |  | 		len--; | 
    
    | 80 |  |  | 	if (len >= sizeof(line) || len == 0) | 
    
    | 81 |  |  | 		goto again; | 
    
    | 82 |  |  | 	p = memcpy(line, p, len); | 
    
    | 83 |  |  | 	line[len] = '\0'; | 
    
    | 84 |  |  | 	if (*p == '#') | 
    
    | 85 |  |  | 		goto again; | 
    
    | 86 |  |  | 	if ((cp = strchr(p, '#')) != NULL) | 
    
    | 87 |  |  | 		*cp = '\0'; | 
    
    | 88 |  |  | 	net.n_name = p; | 
    
    | 89 |  |  | 	if (strlen(net.n_name) > HOST_NAME_MAX) | 
    
    | 90 |  |  | 		net.n_name[HOST_NAME_MAX] = '\0'; | 
    
    | 91 |  |  | 	cp = strpbrk(p, " \t"); | 
    
    | 92 |  |  | 	if (cp == NULL) | 
    
    | 93 |  |  | 		goto again; | 
    
    | 94 |  |  | 	*cp++ = '\0'; | 
    
    | 95 |  |  | 	while (*cp == ' ' || *cp == '\t') | 
    
    | 96 |  |  | 		cp++; | 
    
    | 97 |  |  | 	p = strpbrk(cp, " \t"); | 
    
    | 98 |  |  | 	if (p != NULL) | 
    
    | 99 |  |  | 		*p++ = '\0'; | 
    
    | 100 |  |  | 	net.n_net = inet_network(cp); | 
    
    | 101 |  |  | 	net.n_addrtype = AF_INET; | 
    
    | 102 |  |  | 	q = net.n_aliases = net_aliases; | 
    
    | 103 |  |  | 	cp = p; | 
    
    | 104 |  |  | 	while (cp && *cp) { | 
    
    | 105 |  |  | 		if (*cp == ' ' || *cp == '\t') { | 
    
    | 106 |  |  | 			cp++; | 
    
    | 107 |  |  | 			continue; | 
    
    | 108 |  |  | 		} | 
    
    | 109 |  |  | 		if (q < &net_aliases[MAXALIASES - 1]) { | 
    
    | 110 |  |  | 			*q++ = cp; | 
    
    | 111 |  |  | 			if (strlen(cp) > HOST_NAME_MAX) | 
    
    | 112 |  |  | 				cp[HOST_NAME_MAX] = '\0'; | 
    
    | 113 |  |  | 		} | 
    
    | 114 |  |  | 		cp = strpbrk(cp, " \t"); | 
    
    | 115 |  |  | 		if (cp != NULL) | 
    
    | 116 |  |  | 			*cp++ = '\0'; | 
    
    | 117 |  |  | 	} | 
    
    | 118 |  |  | 	*q = NULL; | 
    
    | 119 |  |  | 	return (&net); | 
    
    | 120 |  |  | } |