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getservent_r.c revision 1.4.6.1
      1 /*	$NetBSD: getservent_r.c,v 1.4.6.1 2005/04/21 16:59:15 tron 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 1.4.6.1 2005/04/21 16:59:15 tron 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 #include "servent.h"
     49 
     50 #ifdef __weak_alias
     51 __weak_alias(endservent_r,_endservent_r)
     52 __weak_alias(getservent_r,_getservent_r)
     53 __weak_alias(setservent_r,_setservent_r)
     54 #endif
     55 
     56 void
     57 setservent_r(int f, struct servent_data *sd)
     58 {
     59 	if (sd->fp == NULL)
     60 		sd->fp = fopen(_PATH_SERVICES, "r");
     61 	else
     62 		rewind(sd->fp);
     63 	sd->stayopen |= f;
     64 }
     65 
     66 void
     67 endservent_r(struct servent_data *sd)
     68 {
     69 	if (sd->fp) {
     70 		(void)fclose(sd->fp);
     71 		sd->fp = NULL;
     72 	}
     73 	if (sd->aliases) {
     74 		free(sd->aliases);
     75 		sd->aliases = NULL;
     76 		sd->maxaliases = 0;
     77 	}
     78 	if (sd->line) {
     79 		free(sd->line);
     80 		sd->line = NULL;
     81 	}
     82 	sd->stayopen = 0;
     83 }
     84 
     85 struct servent *
     86 getservent_r(struct servent *sp, struct servent_data *sd)
     87 {
     88 	char *p, *cp, **q;
     89 	size_t i = 0;
     90 	int oerrno;
     91 
     92 	if (sd->fp == NULL && (sd->fp = fopen(_PATH_SERVICES, "r")) == NULL)
     93 		return NULL;
     94 
     95 	for (;;) {
     96 		if (sd->line)
     97 			free(sd->line);
     98 		sd->line = fparseln(sd->fp, NULL, NULL, NULL,
     99 		    FPARSELN_UNESCALL);
    100 		if (sd->line == NULL)
    101 			return NULL;
    102 		sp->s_name = p = sd->line;
    103 		p = strpbrk(p, " \t");
    104 		if (p == NULL)
    105 			continue;
    106 		*p++ = '\0';
    107 		while (*p == ' ' || *p == '\t')
    108 			p++;
    109 		cp = strpbrk(p, ",/");
    110 		if (cp == NULL)
    111 			continue;
    112 		*cp++ = '\0';
    113 		sp->s_port = htons((u_short)atoi(p));
    114 		sp->s_proto = cp;
    115 		if (sd->aliases == NULL) {
    116 			sd->maxaliases = 10;
    117 			sd->aliases = malloc(sd->maxaliases * sizeof(char *));
    118 			if (sd->aliases == NULL) {
    119 				oerrno = errno;
    120 				endservent_r(sd);
    121 				errno = oerrno;
    122 				return NULL;
    123 			}
    124 		}
    125 		q = sp->s_aliases = sd->aliases;
    126 		cp = strpbrk(cp, " \t");
    127 		if (cp != NULL)
    128 			*cp++ = '\0';
    129 		while (cp && *cp) {
    130 			if (*cp == ' ' || *cp == '\t') {
    131 				cp++;
    132 				continue;
    133 			}
    134 			if (i == sd->maxaliases - 2) {
    135 				sd->maxaliases *= 2;
    136 				q = realloc(q,
    137 				    sd->maxaliases * sizeof(char *));
    138 				if (q == NULL) {
    139 					oerrno = errno;
    140 					endservent_r(sd);
    141 					errno = oerrno;
    142 					return NULL;
    143 				}
    144 				sp->s_aliases = sd->aliases = q;
    145 			}
    146 			q[i++] = cp;
    147 			cp = strpbrk(cp, " \t");
    148 			if (cp != NULL)
    149 				*cp++ = '\0';
    150 		}
    151 		q[i] = NULL;
    152 		return sp;
    153 	}
    154 }
    155