lib/libc/net/getservbyport_r.c

   1 /*      $NetBSD: getservbyport_r.c,v 1.5 2006/07/28 15:14:45 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 1.5 2006/07/28 15:14:45 christos Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include "namespace.h"
  42 #include <stdio.h>
  43 #include <netdb.h>
  44 #include <string.h>
  45 #include <stdlib.h>
  46 #include <db.h>
  47
  48 #include "servent.h"
  49
  50 #ifdef __weak_alias
  51 __weak_alias(getservbyport_r,_getservbyport_r)
  52 #endif
  53
  54 static struct servent *
  55 _servent_getbyport(struct servent_data *sd, struct servent *sp, int port,
  56     const char *proto)
  57 {
  58         if (sd->db == NULL)
  59                 return NULL;
  60
  61         if (sd->flags & _SV_DB) {
  62                 char buf[BUFSIZ];
  63                 DBT key, data;
  64                 DB *db = sd->db;
  65                 key.data = buf;
  66
  67                 port = htons(port);
  68                 if (proto == NULL)
  69                         key.size = snprintf(buf, sizeof(buf), "\377%d", port);
  70                 else
  71                         key.size = snprintf(buf, sizeof(buf), "\377%d/%s", port,
  72                             proto);
  73                 key.size++;
  74
  75                 if ((*db->get)(db, &key, &data, 0) != 0)
  76                         return NULL;
  77
  78                 if ((*db->get)(db, &data, &key, 0) != 0)
  79                         return NULL;
  80
  81                 if (sd->line)
  82                         free(sd->line);
  83
  84                 sd->line = strdup(key.data);
  85                 return _servent_parseline(sd, sp);
  86         } else {
  87                 while (_servent_getline(sd) != -1) {
  88                         if (_servent_parseline(sd, sp) == NULL)
  89                                 continue;
  90                         if (sp->s_port != port)
  91                                 continue;
  92                         if (proto == NULL || strcmp(sp->s_proto, proto) == 0)
  93                                 return sp;
  94                 }
  95                 return NULL;
  96         }
  97 }
  98
  99 struct servent *
 100 getservbyport_r(int port, const char *proto, struct servent *sp,
 101     struct servent_data *sd)
 102 {
 103         setservent_r(sd->flags & _SV_STAYOPEN, sd);
 104         sp = _servent_getbyport(sd, sp, port, proto);
 105         if (!(sd->flags & _SV_STAYOPEN))
 106                 _servent_close(sd);
 107         return sp;
 108 }