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      1 /*	$NetBSD: getprotoent_r.c,v 1.8 2022/03/12 17:31:39 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[] = "@(#)getprotoent.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: getprotoent_r.c,v 1.8 2022/03/12 17:31:39 christos Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include "namespace.h"
     42 #include <netdb.h>
     43 #include <stdio.h>
     44 #include <errno.h>
     45 #include <stdlib.h>
     46 #include <string.h>
     47 
     48 #include "protoent.h"
     49 
     50 #ifdef __weak_alias
     51 __weak_alias(endprotoent_r,_endprotoent_r)
     52 __weak_alias(getprotoent_r,_getprotoent_r)
     53 __weak_alias(setprotoent_r,_setprotoent_r)
     54 #endif
     55 
     56 void
     57 setprotoent_r(int f, struct protoent_data *pd)
     58 {
     59 	if (pd->fp == NULL)
     60 		pd->fp = fopen(_PATH_PROTOCOLS, "re");
     61 	else
     62 		rewind(pd->fp);
     63 	pd->stayopen |= f;
     64 }
     65 
     66 void
     67 endprotoent_r(struct protoent_data *pd)
     68 {
     69 	if (pd->fp) {
     70 		(void)fclose(pd->fp);
     71 		pd->fp = NULL;
     72 	}
     73 	if (pd->aliases) {
     74 		free(pd->aliases);
     75 		pd->aliases = NULL;
     76 		pd->maxaliases = 0;
     77 	}
     78 	if (pd->line) {
     79 		free(pd->line);
     80 		pd->line = NULL;
     81 	}
     82 	pd->stayopen = 0;
     83 }
     84 
     85 struct protoent *
     86 getprotoent_r(struct protoent *pr, struct protoent_data *pd)
     87 {
     88 	char *p, *cp, **q;
     89 	size_t i = 0;
     90 	int serrno;
     91 
     92 	if (pd->fp == NULL && (pd->fp = fopen(_PATH_PROTOCOLS, "re")) == NULL)
     93 		return NULL;
     94 
     95 	for (;;) {
     96 		if (pd->line)
     97 			free(pd->line);
     98 		pd->line = fparseln(pd->fp, NULL, NULL, NULL,
     99 		    FPARSELN_UNESCALL);
    100 		if (pd->line == NULL)
    101 			return NULL;
    102 		pr->p_name = p = pd->line;
    103 		cp = strpbrk(p, " \t");
    104 		if (cp == NULL)
    105 			continue;
    106 		*cp++ = '\0';
    107 		while (*cp == ' ' || *cp == '\t')
    108 			cp++;
    109 		p = strpbrk(cp, " \t");
    110 		if (p != NULL)
    111 			*p++ = '\0';
    112 		pr->p_proto = atoi(cp);
    113 		if (pd->aliases == NULL) {
    114 			pd->aliases = NULL;
    115 			pd->maxaliases = 10;
    116 			errno = reallocarr(&pd->aliases,
    117 			    pd->maxaliases, sizeof(*pd->aliases));
    118 			if (errno)
    119 				goto bad;
    120 		}
    121 		q = pr->p_aliases = pd->aliases;
    122 		if (p != NULL) {
    123 			cp = p;
    124 			while (cp && *cp) {
    125 				if (*cp == ' ' || *cp == '\t') {
    126 					cp++;
    127 					continue;
    128 				}
    129 				if (i == pd->maxaliases - 2) {
    130 					pd->maxaliases *= 2;
    131 					errno = reallocarr(&q,
    132 					    pd->maxaliases, sizeof(*q));
    133 					if (errno)
    134 						goto bad;
    135 					pr->p_aliases = pd->aliases = q;
    136 				}
    137 				q[i++] = cp;
    138 
    139 				cp = strpbrk(cp, " \t");
    140 				if (cp != NULL)
    141 					*cp++ = '\0';
    142 			}
    143 		}
    144 		q[i] = NULL;
    145 		return pr;
    146 	}
    147 bad:
    148 	serrno = errno;
    149 	endprotoent_r(pd);
    150 	errno = serrno;
    151 	return NULL;
    152 }
    153