282 lines
6.6 KiB
C
282 lines
6.6 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getservent.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.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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#ifdef YP
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#include <rpc/rpc.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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static int serv_stepping_yp = 0;
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extern int _yp_check( char ** );
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#endif
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#define MAXALIASES 35
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static FILE *servf = NULL;
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static char line[BUFSIZ+1];
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static struct servent serv;
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static char *serv_aliases[MAXALIASES];
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int _serv_stayopen;
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#ifdef YP
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char *___getservbyname_yp = NULL;
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char *___getservbyproto_yp = NULL;
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int ___getservbyport_yp = 0;
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static char *yp_domain = NULL;
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static int
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_getservbyport_yp(line)
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char *line;
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{
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char *result;
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int resultlen;
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char buf[YPMAXRECORD + 2];
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int rv;
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snprintf(buf, sizeof(buf), "%d/%s", ntohs(___getservbyport_yp),
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___getservbyproto_yp);
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___getservbyport_yp = 0;
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___getservbyproto_yp = NULL;
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if(!yp_domain) {
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if(yp_get_default_domain(&yp_domain))
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return (0);
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}
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/*
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* We have to be a little flexible here. Ideally you're supposed
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* to have both a services.byname and a services.byport map, but
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* some systems have only services.byname. FreeBSD cheats a little
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* by putting the services.byport information in the same map as
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* services.byname so that either case will work. We allow for both
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* possibilities here: if there is no services.byport map, we try
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* services.byname instead.
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*/
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if ((rv = yp_match(yp_domain, "services.byport", buf, strlen(buf),
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&result, &resultlen))) {
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if (rv == YPERR_MAP) {
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if (yp_match(yp_domain, "services.byname", buf,
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strlen(buf), &result, &resultlen))
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return(0);
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} else
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return(0);
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}
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/* getservent() expects lines terminated with \n -- make it happy */
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snprintf(line, BUFSIZ, "%.*s\n", resultlen, result);
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free(result);
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return(1);
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}
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static int
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_getservbyname_yp(line)
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char *line;
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{
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char *result;
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int resultlen;
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char buf[YPMAXRECORD + 2];
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if(!yp_domain) {
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if(yp_get_default_domain(&yp_domain))
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return (0);
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}
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snprintf(buf, sizeof(buf), "%s/%s", ___getservbyname_yp,
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___getservbyproto_yp);
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___getservbyname_yp = 0;
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___getservbyproto_yp = NULL;
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if (yp_match(yp_domain, "services.byname", buf, strlen(buf),
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&result, &resultlen)) {
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return(0);
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}
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/* getservent() expects lines terminated with \n -- make it happy */
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snprintf(line, BUFSIZ, "%.*s\n", resultlen, result);
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free(result);
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return(1);
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}
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static int
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_getservent_yp(line)
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char *line;
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{
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static char *key = NULL;
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static int keylen;
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char *lastkey, *result;
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int resultlen;
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int rv;
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if(!yp_domain) {
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if(yp_get_default_domain(&yp_domain))
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return (0);
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}
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if (!serv_stepping_yp) {
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if (key)
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free(key);
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if ((rv = yp_first(yp_domain, "services.byname", &key, &keylen,
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&result, &resultlen))) {
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serv_stepping_yp = 0;
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return(0);
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}
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serv_stepping_yp = 1;
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} else {
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lastkey = key;
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rv = yp_next(yp_domain, "services.byname", key, keylen, &key,
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&keylen, &result, &resultlen);
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free(lastkey);
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if (rv) {
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serv_stepping_yp = 0;
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return (0);
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}
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}
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/* getservent() expects lines terminated with \n -- make it happy */
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snprintf(line, BUFSIZ, "%.*s\n", resultlen, result);
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free(result);
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return(1);
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}
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#endif
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void
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setservent(f)
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int f;
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{
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if (servf == NULL)
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servf = fopen(_PATH_SERVICES, "r" );
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else
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rewind(servf);
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_serv_stayopen |= f;
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}
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void
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endservent()
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{
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if (servf) {
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fclose(servf);
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servf = NULL;
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}
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_serv_stayopen = 0;
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}
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struct servent *
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getservent()
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{
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char *p;
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char *cp, **q;
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#ifdef YP
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if (serv_stepping_yp && _getservent_yp(line)) {
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p = (char *)&line;
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goto unpack;
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}
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tryagain:
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#endif
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if (servf == NULL && (servf = fopen(_PATH_SERVICES, "r" )) == NULL)
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return (NULL);
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again:
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if ((p = fgets(line, BUFSIZ, servf)) == NULL)
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return (NULL);
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#ifdef YP
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if (*p == '+' && _yp_check(NULL)) {
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if (___getservbyname_yp != NULL) {
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if (!_getservbyname_yp(line))
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goto tryagain;
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}
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else if (___getservbyport_yp != 0) {
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if (!_getservbyport_yp(line))
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goto tryagain;
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}
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else if (!_getservent_yp(line))
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goto tryagain;
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}
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unpack:
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#endif
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if (*p == '#')
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goto again;
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cp = strpbrk(p, "#\n");
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if (cp == NULL)
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goto again;
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*cp = '\0';
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serv.s_name = p;
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p = strpbrk(p, " \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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serv.s_port = htons((u_short)atoi(p));
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serv.s_proto = cp;
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q = serv.s_aliases = serv_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 < &serv_aliases[MAXALIASES - 1])
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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 (&serv);
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}
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