172 lines
4.3 KiB
C
172 lines
4.3 KiB
C
/* $OpenBSD: getservent.c,v 1.15 2015/09/14 07:38:38 guenther Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <limits.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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void
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setservent_r(int f, struct servent_data *sd)
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{
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if (sd->fp == NULL)
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sd->fp = fopen(_PATH_SERVICES, "re" );
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else
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rewind(sd->fp);
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sd->stayopen |= f;
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}
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DEF_WEAK(setservent_r);
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void
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endservent_r(struct servent_data *sd)
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{
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if (sd->fp) {
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fclose(sd->fp);
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sd->fp = NULL;
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}
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free(sd->aliases);
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sd->aliases = NULL;
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sd->maxaliases = 0;
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free(sd->line);
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sd->line = NULL;
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sd->stayopen = 0;
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}
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DEF_WEAK(endservent_r);
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int
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getservent_r(struct servent *se, struct servent_data *sd)
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{
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char *p, *cp, **q, *endp;
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size_t len;
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long l;
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int serrno;
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if (sd->fp == NULL && (sd->fp = fopen(_PATH_SERVICES, "re" )) == NULL)
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return (-1);
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again:
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if ((p = fgetln(sd->fp, &len)) == NULL)
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return (-1);
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if (len == 0 || *p == '#' || *p == '\n')
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goto again;
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if (p[len-1] == '\n')
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len--;
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if ((cp = memchr(p, '#', len)) != NULL)
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len = cp - p;
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cp = realloc(sd->line, len + 1);
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if (cp == NULL)
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return (-1);
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sd->line = se->s_name = memcpy(cp, p, len);
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cp[len] = '\0';
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p = strpbrk(cp, " \t");
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if (p == NULL)
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goto again;
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*p++ = '\0';
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while (*p == ' ' || *p == '\t')
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p++;
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cp = strpbrk(p, ",/");
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if (cp == NULL)
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goto again;
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*cp++ = '\0';
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l = strtol(p, &endp, 10);
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if (endp == p || *endp != '\0' || l < 0 || l > USHRT_MAX)
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goto again;
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se->s_port = htons((in_port_t)l);
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se->s_proto = cp;
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if (sd->aliases == NULL) {
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sd->maxaliases = 10;
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sd->aliases = calloc(sd->maxaliases, sizeof(char *));
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if (sd->aliases == NULL) {
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serrno = errno;
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endservent_r(sd);
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errno = serrno;
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return (-1);
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}
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}
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q = se->s_aliases = sd->aliases;
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cp = strpbrk(cp, " \t");
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if (cp != NULL)
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*cp++ = '\0';
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while (cp && *cp) {
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if (*cp == ' ' || *cp == '\t') {
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cp++;
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continue;
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}
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if (q == &se->s_aliases[sd->maxaliases - 1]) {
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p = reallocarray(se->s_aliases, sd->maxaliases,
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2 * sizeof(char *));
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if (p == NULL) {
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serrno = errno;
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endservent_r(sd);
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errno = serrno;
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return (-1);
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}
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sd->maxaliases *= 2;
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q = (char **)p + (q - se->s_aliases);
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se->s_aliases = sd->aliases = (char **)p;
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}
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*q++ = cp;
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cp = strpbrk(cp, " \t");
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if (cp != NULL)
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*cp++ = '\0';
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}
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*q = NULL;
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return (0);
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}
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DEF_WEAK(getservent_r);
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struct servent_data _servent_data; /* shared with getservby{name,port}.c */
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void
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setservent(int f)
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{
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setservent_r(f, &_servent_data);
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}
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void
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endservent(void)
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{
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endservent_r(&_servent_data);
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}
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struct servent *
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getservent(void)
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{
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static struct servent serv;
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if (getservent_r(&serv, &_servent_data) != 0)
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return (NULL);
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return (&serv);
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}
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