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getservent_r.c revision 1.1 
      1 /*	$NetBSD: getservent_r.c,v 1.1 2004/02/19 19:21:44 christos 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)getservent.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: getservent_r.c,v 1.1 2004/02/19 19:21:44 christos Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include "namespace.h"
     42 #include <netdb.h>
     43 #include <errno.h>
     44 #include <stdio.h>
     45 #include <string.h>
     46 #include <stdlib.h>
     47 
     48 #ifdef __weak_alias
     49 __weak_alias(endservent_r,_endservent_r)
     50 __weak_alias(getservent_r,_getservent_r)
     51 __weak_alias(setservent_r,_setservent_r)
     52 #endif
     53 
     54 void
     55 setservent_r(int f, struct servent_data *sd)
     56 {
     57 	if (sd->fp == NULL)
     58 		sd->fp = fopen(_PATH_SERVICES, "r" );
     59 	else
     60 		rewind(sd->fp);
     61 	sd->stayopen |= f;
     62 }
     63 
     64 void
     65 endservent_r(struct servent_data *sd)
     66 {
     67 	if (sd->fp) {
     68 		(void)fclose(sd->fp);
     69 		sd->fp = NULL;
     70 	}
     71 	if (sd->aliases) {
     72 		free(sd->aliases);
     73 		sd->aliases = NULL;
     74 		sd->maxaliases = 0;
     75 	}
     76 	sd->stayopen = 0;
     77 }
     78 
     79 struct servent *
     80 getservent_r(struct servent *sp, struct servent_data *sd)
     81 {
     82 	char *l = NULL, *p, *cp, **q;
     83 	size_t i = 0;
     84 	int oerrno;
     85 
     86 	if (sd->fp == NULL && (sd->fp = fopen(_PATH_SERVICES, "r")) == NULL)
     87 		return NULL;
     88 
     89 	for (;;) {
     90 		if (l)
     91 			free(l);
     92 		l = fparseln(sd->fp, NULL, NULL, NULL, FPARSELN_UNESCALL);
     93 		if (l == NULL)
     94 			return NULL;
     95 		sp->s_name = p = l;
     96 		p = strpbrk(p, " \t");
     97 		if (p == NULL)
     98 			continue;
     99 		*p++ = '\0';
    100 		while (*p == ' ' || *p == '\t')
    101 			p++;
    102 		cp = strpbrk(p, ",/");
    103 		if (cp == NULL)
    104 			continue;
    105 		*cp++ = '\0';
    106 		sp->s_port = htons((u_short)atoi(p));
    107 		sp->s_proto = cp;
    108 		if (sd->aliases == NULL) {
    109 			sd->aliases = malloc(sd->maxaliases = 10);
    110 			if (sd->aliases == NULL) {
    111 				oerrno = errno;
    112 				endservent_r(sd);
    113 				errno = oerrno;
    114 				return NULL;
    115 			}
    116 		}
    117 		q = sp->s_aliases = sd->aliases;
    118 		cp = strpbrk(cp, " \t");
    119 		if (cp != NULL)
    120 			*cp++ = '\0';
    121 		while (cp && *cp) {
    122 			if (*cp == ' ' || *cp == '\t') {
    123 				cp++;
    124 				continue;
    125 			}
    126 			if (i == sd->maxaliases - 2) {
    127 				sd->maxaliases *= 2;
    128 				q = sd->aliases =
    129 				    realloc(q, sd->maxaliases);
    130 				if (q == NULL) {
    131 					oerrno = errno;
    132 					endservent_r(sd);
    133 					errno = oerrno;
    134 					return NULL;
    135 				}
    136 			}
    137 			q[i++] = cp;
    138 			cp = strpbrk(cp, " \t");
    139 			if (cp != NULL)
    140 				*cp++ = '\0';
    141 		}
    142 		q[i] = NULL;
    143 		return sp;
    144 	}
    145 }
    146