/*
 * Copyright (c) 1983 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. 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getservent.c	5.9 (Berkeley) 2/24/91";
#endif /* LIBC_SCCS and not lint */

#if        !defined(__STDC__) && !defined(const)
#define    const
#endif

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h> 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define	MAXALIASES	35

static FILE *servf = NULL;
static char line[BUFSIZ+1];
static struct servent serv;
static char *serv_aliases[MAXALIASES];
int _Serv_Stayopen;
extern char ServicesFile[];  /* from tcpview.c */

void SetServent(f)
     int f;
{
  if (servf == NULL)
    servf = fopen(ServicesFile, "r" );
  else
    rewind(servf);
  _Serv_Stayopen |= f;
}

void EndServent()
{
  if (servf) {
    fclose(servf);
    servf = NULL;
  }
  _Serv_Stayopen = 0;
}

struct servent *GetServent()
{
  char *p;
  register char *cp, **q;

  if (servf == NULL && (servf = fopen(ServicesFile, "r" )) == NULL) {
    perror(ServicesFile);
    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);
}

struct servent *
GetServByName(name, proto)
	const char *name, *proto;
{
	register struct servent *p;
	register char **cp;

	SetServent(_Serv_Stayopen);
	while (p = GetServent()) {
		if (strcmp(name, p->s_name) == 0)
			goto gotname;
		for (cp = p->s_aliases; *cp; cp++)
			if (strcmp(name, *cp) == 0)
				goto gotname;
		continue;
gotname:
		if (proto == 0 || strcmp(p->s_proto, proto) == 0)
			break;
	}
	if (!_Serv_Stayopen)
		EndServent();
	return (p);
}