contrib/bind-9.2.4rc7/lib/bind/irs/getnetent_r.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 1998-1999 by Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  15  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #if defined(LIBC_SCCS) && !defined(lint)
  19 static const char rcsid[] = "$Id: getnetent_r.c,v 1.3.2.1 2004/03/09 09:17:30 marka Exp $";
  20 #endif /* LIBC_SCCS and not lint */
  21
  22 #include <port_before.h>
  23 #if !defined(_REENTRANT) || !defined(DO_PTHREADS)
  24         static int getnetent_r_not_required = 0;
  25 #else
  26 #include <errno.h>
  27 #include <string.h>
  28 #include <stdio.h>
  29 #include <sys/types.h>
  30 #include <netinet/in.h>
  31 #include <netdb.h>
  32 #include <sys/param.h>
  33 #include <port_after.h>
  34
  35 #ifdef NET_R_RETURN
  36
  37 static NET_R_RETURN
  38 copy_netent(struct netent *, struct netent *, NET_R_COPY_ARGS);
  39
  40 NET_R_RETURN
  41 getnetbyname_r(const char *name,  struct netent *nptr, NET_R_ARGS) {
  42         struct netent *ne = getnetbyname(name);
  43 #ifdef NET_R_SETANSWER
  44         int n = 0;
  45
  46         if (ne == NULL || (n = copy_netent(ne, nptr, NET_R_COPY)) != 0)
  47                 *answerp = NULL;
  48         else
  49                 *answerp = ne;
  50         if (ne == NULL)
  51                 *h_errnop = h_errno;
  52         return (n);
  53 #else
  54         if (ne == NULL)
  55                 return (NET_R_BAD);
  56
  57         return (copy_netent(ne, nptr, NET_R_COPY));
  58 #endif
  59 }
  60
  61 #ifndef GETNETBYADDR_ADDR_T
  62 #define GETNETBYADDR_ADDR_T long
  63 #endif
  64 NET_R_RETURN
  65 getnetbyaddr_r(GETNETBYADDR_ADDR_T addr, int type, struct netent *nptr, NET_R_ARGS) {
  66         struct netent *ne = getnetbyaddr(addr, type);
  67 #ifdef NET_R_SETANSWER
  68         int n = 0;
  69
  70         if (ne == NULL || (n = copy_netent(ne, nptr, NET_R_COPY)) != 0)
  71                 *answerp = NULL;
  72         else
  73                 *answerp = ne;
  74         if (ne == NULL)
  75                 *h_errnop = h_errno;
  76         return (n);
  77 #else
  78
  79         if (ne == NULL)
  80                 return (NET_R_BAD);
  81
  82         return (copy_netent(ne, nptr, NET_R_COPY));
  83 #endif
  84 }
  85
  86 /*
  87  *      These assume a single context is in operation per thread.
  88  *      If this is not the case we will need to call irs directly
  89  *      rather than through the base functions.
  90  */
  91
  92 NET_R_RETURN
  93 getnetent_r(struct netent *nptr, NET_R_ARGS) {
  94         struct netent *ne = getnetent();
  95 #ifdef NET_R_SETANSWER
  96         int n = 0;
  97
  98         if (ne == NULL || (n = copy_netent(ne, nptr, NET_R_COPY)) != 0)
  99                 *answerp = NULL;
 100         else
 101                 *answerp = ne;
 102         if (ne == NULL)
 103                 *h_errnop = h_errno;
 104         return (n);
 105 #else
 106
 107         if (ne == NULL)
 108                 return (NET_R_BAD);
 109
 110         return (copy_netent(ne, nptr, NET_R_COPY));
 111 #endif
 112 }
 113
 114 NET_R_SET_RETURN
 115 #ifdef NET_R_ENT_ARGS
 116 setnetent_r(int stay_open, NET_R_ENT_ARGS)
 117 #else
 118 setnetent_r(int stay_open)
 119 #endif
 120 {
 121         setnetent(stay_open);
 122 #ifdef NET_R_SET_RESULT
 123         return (NET_R_SET_RESULT);
 124 #endif
 125 }
 126
 127 NET_R_END_RETURN
 128 #ifdef NET_R_ENT_ARGS
 129 endnetent_r(NET_R_ENT_ARGS)
 130 #else
 131 endnetent_r()
 132 #endif
 133 {
 134         endnetent();
 135         NET_R_END_RESULT(NET_R_OK);
 136 }
 137
 138 /* Private */
 139
 140 #ifndef NETENT_DATA
 141 static NET_R_RETURN
 142 copy_netent(struct netent *ne, struct netent *nptr, NET_R_COPY_ARGS) {
 143         char *cp;
 144         int i, n;
 145         int numptr, len;
 146
 147         /* Find out the amount of space required to store the answer. */
 148         numptr = 1; /* NULL ptr */
 149         len = (char *)ALIGN(buf) - buf;
 150         for (i = 0; ne->n_aliases[i]; i++, numptr++) {
 151                 len += strlen(ne->n_aliases[i]) + 1;
 152         }
 153         len += strlen(ne->n_name) + 1;
 154         len += numptr * sizeof(char*);
 155
 156         if (len > (int)buflen) {
 157                 errno = ERANGE;
 158                 return (NET_R_BAD);
 159         }
 160
 161         /* copy net value and type */
 162         nptr->n_addrtype = ne->n_addrtype;
 163         nptr->n_net = ne->n_net;
 164
 165         cp = (char *)ALIGN(buf) + numptr * sizeof(char *);
 166
 167         /* copy official name */
 168         n = strlen(ne->n_name) + 1;
 169         strcpy(cp, ne->n_name);
 170         nptr->n_name = cp;
 171         cp += n;
 172
 173         /* copy aliases */
 174         nptr->n_aliases = (char **)ALIGN(buf);
 175         for (i = 0 ; ne->n_aliases[i]; i++) {
 176                 n = strlen(ne->n_aliases[i]) + 1;
 177                 strcpy(cp, ne->n_aliases[i]);
 178                 nptr->n_aliases[i] = cp;
 179                 cp += n;
 180         }
 181         nptr->n_aliases[i] = NULL;
 182
 183         return (NET_R_OK);
 184 }
 185 #else /* !NETENT_DATA */
 186 static int
 187 copy_netent(struct netent *ne, struct netent *nptr, NET_R_COPY_ARGS) {
 188         char *cp, *eob;
 189         int i, n;
 190
 191         /* copy net value and type */
 192         nptr->n_addrtype = ne->n_addrtype;
 193         nptr->n_net = ne->n_net;
 194
 195         /* copy official name */
 196         cp = ndptr->line;
 197         eob = ndptr->line + sizeof(ndptr->line);
 198         if ((n = strlen(ne->n_name) + 1) < (eob - cp)) {
 199                 strcpy(cp, ne->n_name);
 200                 nptr->n_name = cp;
 201                 cp += n;
 202         } else {
 203                 return (-1);
 204         }
 205
 206         /* copy aliases */
 207         i = 0;
 208         nptr->n_aliases = ndptr->net_aliases;
 209         while (ne->n_aliases[i] && i < (_MAXALIASES-1)) {
 210                 if ((n = strlen(ne->n_aliases[i]) + 1) < (eob - cp)) {
 211                         strcpy(cp, ne->n_aliases[i]);
 212                         nptr->n_aliases[i] = cp;
 213                         cp += n;
 214                 } else {
 215                         break;
 216                 }
 217                 i++;
 218         }
 219         nptr->n_aliases[i] = NULL;
 220
 221         return (NET_R_OK);
 222 }
 223 #endif /* !NETENT_DATA */
 224 #else /* NET_R_RETURN */
 225         static int getnetent_r_unknown_system = 0;
 226 #endif /* NET_R_RETURN */
 227 #endif /* !defined(_REENTRANT) || !defined(DO_PTHREADS) */