* Copyright (c) 1983, 1993 The Regents of the University of California.

/*
* Copyright (c) 1983, 1993 The Regents of the University of California.
* Copyright (c) 1993 Digital Equipment Corporation.
* Copyright (c) 2012 G. Vanem <[email protected]>.
* Copyright (c) 2017 Ali Abdulkadir <[email protected]>.
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 <config.h>

#include <netdissect-stdinc.h>
#include <getservent.h>

static FILE *servf = NULL;
static char line[BUFSIZ+1];
static struct servent serv;
static char *serv_aliases[MAXALIASES];
int _serv_stayopen;
const char *etc_path(const char *file);

/*
* Check if <file> exists in the current directory and, if so, return it.
* Else return either "%SYSTEMROOT%\System32\drivers\etc\<file>"
* or $PREFIX/etc/<file>.
* "<file>" is aka __PATH_SERVICES (aka "services" on Windows and
* "/etc/services" on other platforms that would need this).
*/
const char *etc_path(const char *file)
{
const char *env = getenv(__PATH_SYSROOT);
static char path[_MAX_PATH];

/* see if "<file>" exists locally or whether __PATH_SYSROOT is valid */
if (fopen(file, "r") || !env)
return (file);
else
#ifdef _WIN32
snprintf(path, sizeof(path), "%s%s%s", env, __PATH_ETC_INET, file);
#else
snprintf(path, sizeof(path), "%s%s", env, file);
#endif
return (path);
}

void
setservent(int f)
{
if (servf == NULL)
servf = fopen(etc_path(__PATH_SERVICES), "r");
else
rewind(servf);
_serv_stayopen |= f;
}

void
endservent(void)
{
if (servf) {
fclose(servf);
servf = NULL;
}
_serv_stayopen = 0;
}

struct servent *
getservent(void)
{
char *p;
char *cp, **q;

if (servf == NULL && (servf = fopen(etc_path(__PATH_SERVICES), "r")) == NULL)
return (NULL);

again:
if ((p = fgets(line, BUFSIZ, servf)) == NULL)
return (NULL);
if (*p == '#')
goto again;
cp = strpbrk(p, "#\n");
if (cp == NULL)
goto again;
*cp = '\0';
serv.s_name = p;
p = strpbrk(p, " \t");
if (p == NULL)
goto again;
*p++ = '\0';
while (*p == ' ' || *p == '\t')
p++;
cp = strpbrk(p, ",/");
if (cp == NULL)
goto again;
*cp++ = '\0';
serv.s_port = htons((u_short)atoi(p));
serv.s_proto = cp;
q = serv.s_aliases = serv_aliases;
cp = strpbrk(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q < &serv_aliases[MAXALIASES - 1])
*q++ = cp;
cp = strpbrk(cp, " \t");
if (cp != NULL)
*cp++ = '\0';
}
*q = NULL;
return (&serv);
}