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      1 /*	$NetBSD: getservbyport_r.c,v 1.9 2012/03/13 21:13:41 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)getservbyport.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: getservbyport_r.c,v 1.9 2012/03/13 21:13:41 christos Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include "namespace.h"
     42 #include <cdbr.h>
     43 #include <netdb.h>
     44 #include <string.h>
     45 #include <stdlib.h>
     46 
     47 #include "servent.h"
     48 
     49 #ifdef __weak_alias
     50 __weak_alias(getservbyport_r,_getservbyport_r)
     51 #endif
     52 
     53 static struct servent *
     54 _servent_getbyport(struct servent_data *sd, struct servent *sp, int port,
     55     const char *proto)
     56 {
     57 
     58 	if ((sd->flags & (_SV_CDB | _SV_PLAINFILE)) == 0)
     59 		return NULL;
     60 
     61 	if (sd->flags & _SV_CDB) {
     62 		uint8_t buf[255 + 4];
     63 		size_t protolen;
     64 		const uint8_t *data;
     65 		const void *data_ptr;
     66 		size_t datalen;
     67 
     68 		port = be16toh(port);
     69 
     70 		if (proto != NULL) {
     71 			protolen = strlen(proto);
     72 			if (protolen == 0 || protolen > 255)
     73 				return NULL;
     74 		} else
     75 			protolen = 0;
     76 		if (port < 0 || port > 65536)
     77 			return NULL;
     78 
     79 		buf[0] = 0;
     80 		buf[1] = (uint8_t)protolen;
     81 		be16enc(buf + 2, port);
     82 		memcpy(buf + 4, proto, protolen);
     83 
     84 		if (cdbr_find(sd->cdb, buf, 4 + protolen,
     85 		    &data_ptr, &datalen))
     86 			return NULL;
     87 
     88 		if (datalen < protolen + 4)
     89 			return NULL;
     90 
     91 		data = data_ptr;
     92 		if (be16dec(data) != port)
     93 			return NULL;
     94 		if (protolen) {
     95 			if (data[2] != protolen)
     96 				return NULL;
     97 			if (memcmp(data + 3, proto, protolen + 1))
     98 				return NULL;
     99 		}
    100 		return _servent_parsedb(sd, sp, data, datalen);
    101 	} else {
    102 		while (_servent_getline(sd) != -1) {
    103 			if (_servent_parseline(sd, sp) == NULL)
    104 				continue;
    105 			if (sp->s_port != port)
    106 				continue;
    107 			if (proto == NULL || strcmp(sp->s_proto, proto) == 0)
    108 				return sp;
    109 		}
    110 		return NULL;
    111 	}
    112 }
    113 
    114 struct servent *
    115 getservbyport_r(int port, const char *proto, struct servent *sp,
    116     struct servent_data *sd)
    117 {
    118 	setservent_r(sd->flags & _SV_STAYOPEN, sd);
    119 	sp = _servent_getbyport(sd, sp, port, proto);
    120 	if (!(sd->flags & _SV_STAYOPEN))
    121 		_servent_close(sd);
    122 	return sp;
    123 }
    124