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  * $DragonFly: src/lib/libc/net/getproto.c,v 1.5 2005/11/13 02:04:47 swildner Exp $
  32  */
  33
  34 #include <netdb.h>
  35 #include <nsswitch.h>
  36 #include "netdb_private.h"
  37 #ifdef NS_CACHING
  38 #include "nscache.h"
  39 #endif
  40 #include "nss_tls.h"
  41
  42 static const ns_src defaultsrc[] = {
  43         { NSSRC_FILES, NS_SUCCESS },
  44         { NULL, 0 }
  45 };
  46
  47 #ifdef NS_CACHING
  48 extern int __proto_id_func(char *, size_t *, va_list, void *);
  49 extern int __proto_marshal_func(char *, size_t *, void *, va_list, void *);
  50 extern int __proto_unmarshal_func(char *, size_t, void *, va_list, void *);
  51 #endif
  52
  53 static int
  54 files_getprotobynumber(void *retval, void *mdata, va_list ap)
  55 {
  56         struct protoent pe;
  57         struct protoent_data *ped;
  58         int error;
  59
  60         int number;
  61         struct protoent *pptr;
  62         char *buffer;
  63         size_t buflen;
  64         int *errnop;
  65
  66         number = va_arg(ap, int);
  67         pptr = va_arg(ap, struct protoent *);
  68         buffer = va_arg(ap, char *);
  69         buflen = va_arg(ap, size_t);
  70         errnop = va_arg(ap, int *);
  71
  72         if ((ped = __protoent_data_init()) == NULL) {
  73                 *errnop = -1;
  74                 return (NS_NOTFOUND);
  75         }
  76
  77         __setprotoent_p(ped->stayopen, ped);
  78         while ((error = __getprotoent_p(&pe, ped)) == 0)
  79                 if (pe.p_proto == number)
  80                         break;
  81         if (!ped->stayopen)
  82                 __endprotoent_p(ped);
  83         if (error != 0) {
  84                 *errnop = -1;
  85                 return (NS_NOTFOUND);
  86         }
  87         if (__copy_protoent(&pe, pptr, buffer, buflen) != 0) {
  88                 *errnop = -1;
  89                 return (NS_NOTFOUND);
  90         }
  91
  92         *((struct protoent **)retval) = pptr;
  93         return (NS_SUCCESS);
  94 }
  95
  96 int
  97 getprotobynumber_r(int proto, struct protoent *pptr, char *buffer,
  98     size_t buflen, struct protoent **result)
  99 {
 100 #ifdef NS_CACHING
 101         static const nss_cache_info cache_info =
 102                 NS_COMMON_CACHE_INFO_INITIALIZER(
 103                 protocols, (void *)nss_lt_id,
 104                 __proto_id_func, __proto_marshal_func, __proto_unmarshal_func);
 105 #endif
 106
 107         static const ns_dtab dtab[] = {
 108                 { NSSRC_FILES, files_getprotobynumber, NULL },
 109 #ifdef NS_CACHING
 110                 NS_CACHE_CB(&cache_info)
 111 #endif
 112                 { NULL, NULL, NULL }
 113         };
 114         int     rv, ret_errno;
 115
 116         ret_errno = 0;
 117         *result = NULL;
 118         rv = nsdispatch(result, dtab, NSDB_PROTOCOLS, "getprotobynumber_r",
 119                 defaultsrc, proto, pptr, buffer, buflen, &ret_errno);
 120
 121         if (rv == NS_SUCCESS)
 122                 return (0);
 123         else
 124                 return (ret_errno);
 125 }
 126
 127 struct protoent *
 128 getprotobynumber(int proto)
 129 {
 130         struct protodata *pd;
 131         struct protoent *rval;
 132
 133         if ((pd = __protodata_init()) == NULL)
 134                 return (NULL);
 135         if (getprotobynumber_r(proto, &pd->proto, pd->data, sizeof(pd->data),
 136             &rval) != 0)
 137                 return (NULL);
 138         return (rval);
 139 }