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/* $OpenBSD: getservent.c,v 1.12 2007/09/02 15:19:17 deraadt Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <limits.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void
setservent_r(int f, struct servent_data *sd)
{
if (sd->fp == NULL)
sd->fp = fopen(_PATH_SERVICES, "r" );
else
rewind(sd->fp);
sd->stayopen |= f;
}
void
endservent_r(struct servent_data *sd)
{
if (sd->fp) {
fclose(sd->fp);
sd->fp = NULL;
}
free(sd->aliases);
sd->aliases = NULL;
sd->maxaliases = 0;
free(sd->line);
sd->line = NULL;
sd->stayopen = 0;
}
int
getservent_r(struct servent *se, struct servent_data *sd)
{
char *p, *cp, **q, *endp;
size_t len;
long l;
int serrno;
if (sd->fp == NULL && (sd->fp = fopen(_PATH_SERVICES, "r" )) == NULL)
return (-1);
again:
if ((p = fgetln(sd->fp, &len)) == NULL)
return (-1);
if (len == 0 || *p == '#' || *p == '\n')
goto again;
if (p[len-1] == '\n')
len--;
if ((cp = memchr(p, '#', len)) != NULL)
len = cp - p;
cp = realloc(sd->line, len + 1);
if (cp == NULL)
return (-1);
sd->line = se->s_name = memcpy(cp, p, len);
cp[len] = '\0';
p = strpbrk(cp, " \t");
if (p == NULL)
goto again;
*p++ = '\0';
while (*p == ' ' || *p == '\t')
p++;
cp = strpbrk(p, ",/");
if (cp == NULL)
goto again;
*cp++ = '\0';
l = strtol(p, &endp, 10);
if (endp == p || *endp != '\0' || l < 0 || l > USHRT_MAX)
goto again;
se->s_port = htons((in_port_t)l);
se->s_proto = cp;
if (sd->aliases == NULL) {
sd->maxaliases = 10;
sd->aliases = calloc(sd->maxaliases, sizeof(char *));
if (sd->aliases == NULL) {
serrno = errno;
endservent_r(sd);
errno = serrno;
return (-1);
}
}
q = se->s_aliases = sd->aliases;
cp = strpbrk(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q == &se->s_aliases[sd->maxaliases - 1]) {
p = realloc(se->s_aliases,
2 * sd->maxaliases * sizeof(char *));
if (p == NULL) {
serrno = errno;
endservent_r(sd);
errno = serrno;
return (-1);
}
sd->maxaliases *= 2;
q = (char **)p + (q - se->s_aliases);
se->s_aliases = sd->aliases = (char **)p;
}
*q++ = cp;
cp = strpbrk(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
}
*q = NULL;
return (0);
}
struct servent_data _servent_data; /* shared with getservby{name,port}.c */
void
setservent(int f)
{
setservent_r(f, &_servent_data);
}
void
endservent(void)
{
endservent_r(&_servent_data);
}
struct servent *
getservent(void)
{
static struct servent serv;
if (getservent_r(&serv, &_servent_data) != 0)
return (NULL);
return (&serv);
}
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