lib/libc/net/getproto.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)getproto.c       8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: src/lib/libc/net/getproto.c,v 1.7 2007/01/09 00:28:02 imp Exp $
  31  */
  32
  33 #include <netdb.h>
  34 #include <nsswitch.h>
  35 #include "netdb_private.h"
  36 #ifdef NS_CACHING
  37 #include "nscache.h"
  38 #endif
  39 #include "nss_tls.h"
  40
  41 static const ns_src defaultsrc[] = {
  42         { NSSRC_FILES, NS_SUCCESS },
  43         { NULL, 0 }
  44 };
  45
  46 #ifdef NS_CACHING
  47 extern int __proto_id_func(char *, size_t *, va_list, void *);
  48 extern int __proto_marshal_func(char *, size_t *, void *, va_list, void *);
  49 extern int __proto_unmarshal_func(char *, size_t, void *, va_list, void *);
  50 #endif
  51
  52 static int
  53 files_getprotobynumber(void *retval, void *mdata __unused, va_list ap)
  54 {
  55         struct protoent pe;
  56         struct protoent_data *ped;
  57         int error;
  58
  59         int number;
  60         struct protoent *pptr;
  61         char *buffer;
  62         size_t buflen;
  63         int *errnop;
  64
  65         number = va_arg(ap, int);
  66         pptr = va_arg(ap, struct protoent *);
  67         buffer = va_arg(ap, char *);
  68         buflen = va_arg(ap, size_t);
  69         errnop = va_arg(ap, int *);
  70
  71         if ((ped = __protoent_data_init()) == NULL) {
  72                 *errnop = -1;
  73                 return (NS_NOTFOUND);
  74         }
  75
  76         __setprotoent_p(ped->stayopen, ped);
  77         while ((error = __getprotoent_p(&pe, ped)) == 0)
  78                 if (pe.p_proto == number)
  79                         break;
  80         if (!ped->stayopen)
  81                 __endprotoent_p(ped);
  82         if (error != 0) {
  83                 *errnop = -1;
  84                 return (NS_NOTFOUND);
  85         }
  86         if (__copy_protoent(&pe, pptr, buffer, buflen) != 0) {
  87                 *errnop = -1;
  88                 return (NS_NOTFOUND);
  89         }
  90
  91         *((struct protoent **)retval) = pptr;
  92         return (NS_SUCCESS);
  93 }
  94
  95 int
  96 getprotobynumber_r(int proto, struct protoent *pptr, char *buffer,
  97     size_t buflen, struct protoent **result)
  98 {
  99 #ifdef NS_CACHING
 100         static const nss_cache_info cache_info =
 101                 NS_COMMON_CACHE_INFO_INITIALIZER(
 102                 protocols, (void *)nss_lt_id,
 103                 __proto_id_func, __proto_marshal_func, __proto_unmarshal_func);
 104 #endif
 105
 106         static const ns_dtab dtab[] = {
 107                 { NSSRC_FILES, files_getprotobynumber, NULL },
 108 #ifdef NS_CACHING
 109                 NS_CACHE_CB(&cache_info)
 110 #endif
 111                 { NULL, NULL, NULL }
 112         };
 113         int     rv, ret_errno;
 114
 115         ret_errno = 0;
 116         *result = NULL;
 117         rv = nsdispatch(result, dtab, NSDB_PROTOCOLS, "getprotobynumber_r",
 118                 defaultsrc, proto, pptr, buffer, buflen, &ret_errno);
 119
 120         if (rv == NS_SUCCESS)
 121                 return (0);
 122         else
 123                 return (ret_errno);
 124 }
 125
 126 struct protoent *
 127 getprotobynumber(int proto)
 128 {
 129         struct protodata *pd;
 130         struct protoent *rval;
 131
 132         if ((pd = __protodata_init()) == NULL)
 133                 return (NULL);
 134         if (getprotobynumber_r(proto, &pd->proto, pd->data, sizeof(pd->data),
 135             &rval) != 0)
 136                 return (NULL);
 137         return (rval);
 138 }