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getservent.c revision 1.6 
      1 /*	$NetBSD: getservent.c,v 1.6 1997/07/21 14:08:01 jtc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  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 the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 #if 0
     39 static char sccsid[] = "@(#)getservent.c	8.1 (Berkeley) 6/4/93";
     40 #else
     41 __RCSID("$NetBSD: getservent.c,v 1.6 1997/07/21 14:08:01 jtc Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include "namespace.h"
     46 #include <sys/types.h>
     47 #include <sys/socket.h>
     48 #include <netdb.h>
     49 #include <stdio.h>
     50 #include <string.h>
     51 #include <stdlib.h>
     52 
     53 #ifdef __weak_alias
     54 __weak_alias(endservent,_endservent);
     55 __weak_alias(getservent,_getservent);
     56 __weak_alias(setservent,_setservent);
     57 #endif
     58 
     59 #define	MAXALIASES	35
     60 
     61 static FILE *servf = NULL;
     62 static char line[BUFSIZ+1];
     63 static struct servent serv;
     64 static char *serv_aliases[MAXALIASES];
     65 int _serv_stayopen;
     66 
     67 void
     68 setservent(f)
     69 	int f;
     70 {
     71 	if (servf == NULL)
     72 		servf = fopen(_PATH_SERVICES, "r" );
     73 	else
     74 		rewind(servf);
     75 	_serv_stayopen |= f;
     76 }
     77 
     78 void
     79 endservent()
     80 {
     81 	if (servf) {
     82 		fclose(servf);
     83 		servf = NULL;
     84 	}
     85 	_serv_stayopen = 0;
     86 }
     87 
     88 struct servent *
     89 getservent()
     90 {
     91 	char *p;
     92 	register char *cp, **q;
     93 
     94 	if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL)
     95 		return (NULL);
     96 again:
     97 	if ((p = fgets(line, BUFSIZ, servf)) == NULL)
     98 		return (NULL);
     99 	if (*p == '#')
    100 		goto again;
    101 	cp = strpbrk(p, "#\n");
    102 	if (cp == NULL)
    103 		goto again;
    104 	*cp = '\0';
    105 	serv.s_name = p;
    106 	p = strpbrk(p, " \t");
    107 	if (p == NULL)
    108 		goto again;
    109 	*p++ = '\0';
    110 	while (*p == ' ' || *p == '\t')
    111 		p++;
    112 	cp = strpbrk(p, ",/");
    113 	if (cp == NULL)
    114 		goto again;
    115 	*cp++ = '\0';
    116 	serv.s_port = htons((u_short)atoi(p));
    117 	serv.s_proto = cp;
    118 	q = serv.s_aliases = serv_aliases;
    119 	cp = strpbrk(cp, " \t");
    120 	if (cp != NULL)
    121 		*cp++ = '\0';
    122 	while (cp && *cp) {
    123 		if (*cp == ' ' || *cp == '\t') {
    124 			cp++;
    125 			continue;
    126 		}
    127 		if (q < &serv_aliases[MAXALIASES - 1])
    128 			*q++ = cp;
    129 		cp = strpbrk(cp, " \t");
    130 		if (cp != NULL)
    131 			*cp++ = '\0';
    132 	}
    133 	*q = NULL;
    134 	return (&serv);
    135 }
    136