lib/libc/net/getprotoname.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  * @(#)getprotoname.c   8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: src/lib/libc/net/getprotoname.c,v 1.7 2007/01/09 00:28:02 imp Exp $
  31  * $DragonFly: src/lib/libc/net/getprotoname.c,v 1.5 2005/11/13 02:04:47 swildner Exp $
  32  */
  33
  34 #include <netdb.h>
  35 #include <nsswitch.h>
  36 #include <string.h>
  37 #include "netdb_private.h"
  38 #ifdef NS_CACHING
  39 #include "nscache.h"
  40 #endif
  41 #include "nss_tls.h"
  42
  43 static const ns_src defaultsrc[] = {
  44         { NSSRC_FILES, NS_SUCCESS },
  45         { NULL, 0 }
  46 };
  47
  48 #ifdef NS_CACHING
  49 extern int __proto_id_func(char *, size_t *, va_list, void *);
  50 extern int __proto_marshal_func(char *, size_t *, void *, va_list, void *);
  51 extern int __proto_unmarshal_func(char *, size_t, void *, va_list, void *);
  52 #endif
  53
  54 static int
  55 files_getprotobyname(void *retval, void *mdata, va_list ap)
  56 {
  57         struct protoent pe;
  58         struct protoent_data *ped;
  59         char **cp;
  60         int error;
  61
  62         char *name;
  63         struct protoent *pptr;
  64         char *buffer;
  65         size_t buflen;
  66         int *errnop;
  67
  68         name = va_arg(ap, char *);
  69         pptr = va_arg(ap, struct protoent *);
  70         buffer = va_arg(ap, char *);
  71         buflen = va_arg(ap, size_t);
  72         errnop = va_arg(ap, int *);
  73
  74
  75         if ((ped = __protoent_data_init()) == NULL) {
  76                 *errnop = -1;
  77                 return (NS_NOTFOUND);
  78         }
  79
  80         __setprotoent_p(ped->stayopen, ped);
  81         while ((error = __getprotoent_p(&pe, ped)) == 0) {
  82                 if (strcmp(pe.p_name, name) == 0)
  83                         break;
  84                 for (cp = pe.p_aliases; *cp != 0; cp++)
  85                         if (strcmp(*cp, name) == 0)
  86                                 goto found;
  87         }
  88 found:
  89         if (!ped->stayopen)
  90                 __endprotoent_p(ped);
  91         if (error != 0) {
  92                 *errnop = -1;
  93                 return (NS_NOTFOUND);
  94         }
  95         if (__copy_protoent(&pe, pptr, buffer, buflen) != 0) {
  96                 *errnop = -1;
  97                 return (NS_NOTFOUND);
  98         }
  99
 100         *((struct protoent **)retval) = pptr;
 101         return (NS_SUCCESS);
 102 }
 103
 104
 105 int
 106 getprotobyname_r(const char *name, struct protoent *pptr, char *buffer,
 107     size_t buflen, struct protoent **result)
 108 {
 109 #ifdef NS_CACHING
 110         static const nss_cache_info cache_info =
 111                 NS_COMMON_CACHE_INFO_INITIALIZER(
 112                 protocols, (void *)nss_lt_name,
 113                 __proto_id_func, __proto_marshal_func, __proto_unmarshal_func);
 114 #endif
 115         static const ns_dtab dtab[] = {
 116                 { NSSRC_FILES, files_getprotobyname, NULL },
 117 #ifdef NS_CACHING
 118                 NS_CACHE_CB(&cache_info)
 119 #endif
 120                 { NULL, NULL, NULL }
 121         };
 122         int     rv, ret_errno;
 123
 124         ret_errno = 0;
 125         *result = NULL;
 126         rv = nsdispatch(result, dtab, NSDB_PROTOCOLS, "getprotobyname_r",
 127             defaultsrc, name, pptr, buffer, buflen, &ret_errno);
 128
 129         if (rv == NS_SUCCESS)
 130                 return (0);
 131         else
 132                 return (ret_errno);
 133 }
 134
 135 struct protoent *
 136 getprotobyname(const char *name)
 137 {
 138         struct protodata *pd;
 139         struct protoent *rval;
 140
 141         if ((pd = __protodata_init()) == NULL)
 142                 return (NULL);
 143         if (getprotobyname_r(name, &pd->proto, pd->data, sizeof(pd->data),
 144             &rval) != 0)
 145                 return (NULL);
 146         return (rval);
 147 }