318 lines
7.7 KiB
C
318 lines
7.7 KiB
C
/* Copyright (C) 1997, 1999, 2000, 2001, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by H.J. Lu <hjl@gnu.ai.mit.edu>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <wctype.h>
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#include <resolv.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include "nsswitch.h"
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#ifdef USE_NSCD
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# define inet_aton __inet_aton
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# include <nscd/nscd_proto.h>
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#endif
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int
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__nss_hostname_digits_dots (const char *name, struct hostent *resbuf,
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char **buffer, size_t *buffer_size,
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size_t buflen, struct hostent **result,
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enum nss_status *status, int af, int *h_errnop)
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{
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int save;
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/* We have to test for the use of IPv6 which can only be done by
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examining `_res'. */
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if (__res_maybe_init (&_res, 0) == -1)
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{
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if (h_errnop)
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*h_errnop = NETDB_INTERNAL;
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*result = NULL;
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return -1;
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}
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/*
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* disallow names consisting only of digits/dots, unless
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* they end in a dot.
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*/
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if (isdigit (name[0]) || isxdigit (name[0]) || name[0] == ':')
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{
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const char *cp;
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char *hostname;
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typedef unsigned char host_addr_t[16];
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host_addr_t *host_addr;
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typedef char *host_addr_list_t[2];
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host_addr_list_t *h_addr_ptrs;
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char **h_alias_ptr;
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size_t size_needed;
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int addr_size;
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switch (af)
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{
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case AF_INET:
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addr_size = INADDRSZ;
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break;
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case AF_INET6:
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addr_size = IN6ADDRSZ;
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break;
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default:
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af = (_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET;
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addr_size = af == AF_INET6 ? IN6ADDRSZ : INADDRSZ;
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break;
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}
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size_needed = (sizeof (*host_addr)
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+ sizeof (*h_addr_ptrs) + strlen (name) + 1);
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if (buffer_size == NULL)
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{
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if (buflen < size_needed)
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{
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if (h_errnop != NULL)
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*h_errnop = TRY_AGAIN;
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__set_errno (ERANGE);
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goto done;
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}
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}
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else if (buffer_size != NULL && *buffer_size < size_needed)
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{
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char *new_buf;
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*buffer_size = size_needed;
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new_buf = (char *) realloc (*buffer, *buffer_size);
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if (new_buf == NULL)
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{
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save = errno;
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free (*buffer);
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*buffer = NULL;
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*buffer_size = 0;
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__set_errno (save);
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if (h_errnop != NULL)
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*h_errnop = TRY_AGAIN;
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*result = NULL;
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goto done;
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}
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*buffer = new_buf;
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}
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memset (*buffer, '\0', size_needed);
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host_addr = (host_addr_t *) *buffer;
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h_addr_ptrs = (host_addr_list_t *)
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((char *) host_addr + sizeof (*host_addr));
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h_alias_ptr = (char **) ((char *) h_addr_ptrs + sizeof (*h_addr_ptrs));
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hostname = (char *) h_alias_ptr + sizeof (*h_alias_ptr);
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if (isdigit (name[0]))
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{
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for (cp = name;; ++cp)
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{
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if (*cp == '\0')
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{
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int ok;
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if (*--cp == '.')
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break;
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/* All-numeric, no dot at the end. Fake up a hostent as if
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we'd actually done a lookup. What if someone types
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255.255.255.255? The test below will succeed
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spuriously... ??? */
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if (af == AF_INET)
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ok = __inet_aton (name, (struct in_addr *) host_addr);
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else
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{
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assert (af == AF_INET6);
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ok = inet_pton (af, name, host_addr) > 0;
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}
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if (! ok)
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{
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*h_errnop = HOST_NOT_FOUND;
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if (buffer_size)
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*result = NULL;
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goto done;
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}
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resbuf->h_name = strcpy (hostname, name);
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h_alias_ptr[0] = NULL;
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resbuf->h_aliases = h_alias_ptr;
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(*h_addr_ptrs)[0] = (char *) host_addr;
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(*h_addr_ptrs)[1] = NULL;
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resbuf->h_addr_list = *h_addr_ptrs;
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if (af == AF_INET && (_res.options & RES_USE_INET6))
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{
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/* We need to change the IP v4 address into the
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IP v6 address. */
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char tmp[INADDRSZ];
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char *p = (char *) host_addr;
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int i;
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/* Save a copy of the IP v4 address. */
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memcpy (tmp, host_addr, INADDRSZ);
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/* Mark this ipv6 addr as a mapped ipv4. */
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for (i = 0; i < 10; i++)
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*p++ = 0x00;
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*p++ = 0xff;
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*p++ = 0xff;
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/* Copy the IP v4 address. */
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memcpy (p, tmp, INADDRSZ);
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resbuf->h_addrtype = AF_INET6;
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resbuf->h_length = IN6ADDRSZ;
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}
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else
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{
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resbuf->h_addrtype = af;
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resbuf->h_length = addr_size;
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}
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if (h_errnop != NULL)
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*h_errnop = NETDB_SUCCESS;
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if (buffer_size == NULL)
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*status = NSS_STATUS_SUCCESS;
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else
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*result = resbuf;
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goto done;
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}
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if (!isdigit (*cp) && *cp != '.')
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break;
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}
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}
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if ((isxdigit (name[0]) && strchr (name, ':') != NULL) || name[0] == ':')
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{
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const char *cp;
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char *hostname;
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typedef unsigned char host_addr_t[16];
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host_addr_t *host_addr;
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typedef char *host_addr_list_t[2];
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host_addr_list_t *h_addr_ptrs;
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size_t size_needed;
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int addr_size;
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switch (af)
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{
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default:
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af = (_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET;
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if (af == AF_INET6)
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{
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addr_size = IN6ADDRSZ;
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break;
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}
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/* FALLTHROUGH */
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case AF_INET:
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/* This is not possible. We cannot represent an IPv6 address
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in an `struct in_addr' variable. */
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*h_errnop = HOST_NOT_FOUND;
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*result = NULL;
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goto done;
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case AF_INET6:
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addr_size = IN6ADDRSZ;
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break;
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}
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size_needed = (sizeof (*host_addr)
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+ sizeof (*h_addr_ptrs) + strlen (name) + 1);
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if (buffer_size == NULL && buflen < size_needed)
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{
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if (h_errnop != NULL)
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*h_errnop = TRY_AGAIN;
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__set_errno (ERANGE);
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goto done;
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}
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else if (buffer_size != NULL && *buffer_size < size_needed)
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{
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char *new_buf;
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*buffer_size = size_needed;
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new_buf = realloc (*buffer, *buffer_size);
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if (new_buf == NULL)
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{
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save = errno;
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free (*buffer);
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__set_errno (save);
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*buffer = NULL;
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*buffer_size = 0;
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*result = NULL;
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goto done;
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}
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*buffer = new_buf;
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}
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memset (*buffer, '\0', size_needed);
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host_addr = (host_addr_t *) *buffer;
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h_addr_ptrs = (host_addr_list_t *)
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((char *) host_addr + sizeof (*host_addr));
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hostname = (char *) h_addr_ptrs + sizeof (*h_addr_ptrs);
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for (cp = name;; ++cp)
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{
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if (!*cp)
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{
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if (*--cp == '.')
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break;
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/* All-IPv6-legal, no dot at the end. Fake up a
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hostent as if we'd actually done a lookup. */
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if (inet_pton (AF_INET6, name, host_addr) <= 0)
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{
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*h_errnop = HOST_NOT_FOUND;
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if (buffer_size)
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*result = NULL;
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goto done;
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}
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resbuf->h_name = strcpy (hostname, name);
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h_alias_ptr[0] = NULL;
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resbuf->h_aliases = h_alias_ptr;
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(*h_addr_ptrs)[0] = (char *) host_addr;
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(*h_addr_ptrs)[1] = (char *) 0;
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resbuf->h_addr_list = *h_addr_ptrs;
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resbuf->h_addrtype = AF_INET6;
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resbuf->h_length = addr_size;
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*h_errnop = NETDB_SUCCESS;
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if (buffer_size == NULL)
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*status = NSS_STATUS_SUCCESS;
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else
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*result = resbuf;
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goto done;
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}
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if (!isxdigit (*cp) && *cp != ':' && *cp != '.')
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break;
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}
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}
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}
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return 0;
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done:
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return 1;
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}
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libc_hidden_def (__nss_hostname_digits_dots)
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