Home | History | Annotate | Line # | Download | only in net
getservent.c revision 1.3 
      1 /*
      2  * Copyright (c) 1983 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #if defined(LIBC_SCCS) && !defined(lint)
     35 /*static char *sccsid = "from: @(#)getservent.c	5.9 (Berkeley) 2/24/91";*/
     36 static char *rcsid = "$Id: getservent.c,v 1.3 1993/08/26 00:46:00 jtc Exp $";
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 #include <sys/types.h>
     40 #include <sys/socket.h>
     41 #include <netdb.h>
     42 #include <stdio.h>
     43 #include <string.h>
     44 #include <stdlib.h>
     45 
     46 #define	MAXALIASES	35
     47 
     48 static FILE *servf = NULL;
     49 static char line[BUFSIZ+1];
     50 static struct servent serv;
     51 static char *serv_aliases[MAXALIASES];
     52 int _serv_stayopen;
     53 
     54 void
     55 setservent(f)
     56 	int f;
     57 {
     58 	if (servf == NULL)
     59 		servf = fopen(_PATH_SERVICES, "r" );
     60 	else
     61 		rewind(servf);
     62 	_serv_stayopen |= f;
     63 }
     64 
     65 void
     66 endservent()
     67 {
     68 	if (servf) {
     69 		fclose(servf);
     70 		servf = NULL;
     71 	}
     72 	_serv_stayopen = 0;
     73 }
     74 
     75 struct servent *
     76 getservent()
     77 {
     78 	char *p;
     79 	register char *cp, **q;
     80 
     81 	if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL)
     82 		return (NULL);
     83 again:
     84 	if ((p = fgets(line, BUFSIZ, servf)) == NULL)
     85 		return (NULL);
     86 	if (*p == '#')
     87 		goto again;
     88 	cp = strpbrk(p, "#\n");
     89 	if (cp == NULL)
     90 		goto again;
     91 	*cp = '\0';
     92 	serv.s_name = p;
     93 	p = strpbrk(p, " \t");
     94 	if (p == NULL)
     95 		goto again;
     96 	*p++ = '\0';
     97 	while (*p == ' ' || *p == '\t')
     98 		p++;
     99 	cp = strpbrk(p, ",/");
    100 	if (cp == NULL)
    101 		goto again;
    102 	*cp++ = '\0';
    103 	serv.s_port = htons((u_short)atoi(p));
    104 	serv.s_proto = cp;
    105 	q = serv.s_aliases = serv_aliases;
    106 	cp = strpbrk(cp, " \t");
    107 	if (cp != NULL)
    108 		*cp++ = '\0';
    109 	while (cp && *cp) {
    110 		if (*cp == ' ' || *cp == '\t') {
    111 			cp++;
    112 			continue;
    113 		}
    114 		if (q < &serv_aliases[MAXALIASES - 1])
    115 			*q++ = cp;
    116 		cp = strpbrk(cp, " \t");
    117 		if (cp != NULL)
    118 			*cp++ = '\0';
    119 	}
    120 	*q = NULL;
    121 	return (&serv);
    122 }
    123