src/kits/network/netresolv/irs/getservbyport_r.c

   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 <netdb.h>
  42 #include <string.h>
  43 #include <stdlib.h>
  44
  45 #include "servent.h"
  46
  47 #ifdef __weak_alias
  48 __weak_alias(getservbyport_r,_getservbyport_r)
  49 #endif
  50
  51 static struct servent *
  52 _servent_getbyport(struct servent_data *sd, struct servent *sp, int port,
  53     const char *proto)
  54 {
  55
  56         if ((sd->flags & (_SV_CDB | _SV_PLAINFILE)) == 0)
  57                 return NULL;
  58
  59 #if 0
  60         if (sd->flags & _SV_CDB) {
  61                 uint8_t buf[255 + 4];
  62                 size_t protolen;
  63                 const uint8_t *data;
  64                 const void *data_ptr;
  65                 size_t datalen;
  66
  67                 port = ntohs(port);
  68
  69                 if (proto != NULL) {
  70                         protolen = strlen(proto);
  71                         if (protolen == 0 || protolen > 255)
  72                                 return NULL;
  73                 } else
  74                         protolen = 0;
  75                 if (port < 0 || port > 65536)
  76                         return NULL;
  77
  78                 buf[0] = 0;
  79                 buf[1] = (uint8_t)protolen;
  80                 be16enc(buf + 2, port);
  81                 memcpy(buf + 4, proto, protolen);
  82
  83                 if (cdbr_find(sd->cdb, buf, 4 + protolen,
  84                     &data_ptr, &datalen))
  85                         return NULL;
  86
  87                 if (datalen < protolen + 4)
  88                         return NULL;
  89
  90                 data = data_ptr;
  91                 if (be16dec(data) != port)
  92                         return NULL;
  93                 if (protolen) {
  94                         if (data[2] != protolen)
  95                                 return NULL;
  96                         if (memcmp(data + 3, proto, protolen + 1))
  97                                 return NULL;
  98                 }
  99                 return _servent_parsedb(sd, sp, data, datalen);
 100         } else
 101 #endif
 102         {
 103                 while (_servent_getline(sd) != -1) {
 104                         if (_servent_parseline(sd, sp) == NULL)
 105                                 continue;
 106                         if (sp->s_port != port)
 107                                 continue;
 108                         if (proto == NULL || strcmp(sp->s_proto, proto) == 0)
 109                                 return sp;
 110                 }
 111                 return NULL;
 112         }
 113 }
 114
 115 struct servent *
 116 getservbyport_r(int port, const char *proto, struct servent *sp,
 117     struct servent_data *sd)
 118 {
 119         setservent_r(sd->flags & _SV_STAYOPEN, sd);
 120         sp = _servent_getbyport(sd, sp, port, proto);
 121         if (!(sd->flags & _SV_STAYOPEN))
 122                 _servent_close(sd);
 123         return sp;
 124 }