280 lines
6.9 KiB
C
280 lines
6.9 KiB
C
/* Copyright (C) 1997, 1999 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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 *host_aliases;
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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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#ifndef HAVE_AF
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int af = -1;
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#endif
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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 (*host_aliases) + sizeof (*h_addr_ptrs)
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+ strlen (name) + 1);
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#ifdef HAVE_LOOKUP_BUFFER
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if (buflen < size_needed)
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{
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__set_errno (ERANGE);
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goto done;
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}
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#else
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if (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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buffer = NULL;
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buffer_size = 0;
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__set_errno (save);
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result = (struct hostent *) 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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#endif /* HAVE_LOOKUP_BUFFER */
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memset (buffer, 0, size_needed);
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host_addr = (host_addr_t *) buffer;
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host_aliases = (host_addr_list_t *)
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((char *) host_addr + sizeof (*host_addr));
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h_addr_ptrs = (host_addr_list_t *)
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((char *) host_aliases + sizeof (*host_aliases));
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hostname = (char *) h_addr_ptrs + sizeof (*h_addr_ptrs);
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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)
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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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__set_h_errno (HOST_NOT_FOUND);
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#ifndef HAVE_LOOKUP_BUFFER
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result = (struct hostent *) NULL;
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#endif
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goto done;
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}
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resbuf.h_name = strcpy (hostname, name);
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resbuf.h_aliases = *host_aliases;
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(*host_aliases)[0] = NULL;
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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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if (_res.options & RES_USE_INET6 && af == AF_INET)
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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], *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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__set_h_errno (NETDB_SUCCESS);
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#ifdef HAVE_LOOKUP_BUFFER
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status = NSS_STATUS_SUCCESS;
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#else
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result = &resbuf;
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#endif
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goto done;
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}
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if (!isdigit (*cp) && *cp != '.') break;
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}
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}
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if ((isxdigit (name[0]) && strchr (name, ':') != NULL)
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|| 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 *host_aliases;
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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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#ifndef HAVE_AF
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int af = -1;
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#endif
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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 (*host_aliases) + sizeof (*h_addr_ptrs)
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+ strlen (name) + 1);
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#ifdef HAVE_LOOKUP_BUFFER
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if (buflen < size_needed)
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{
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__set_errno (ERANGE);
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goto done;
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}
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#else
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if (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 = (struct hostent *) 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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#endif /* HAVE_LOOKUP_BUFFER */
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memset (buffer, 0, size_needed);
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host_addr = (host_addr_t *) buffer;
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host_aliases = (host_addr_list_t *)
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((char *) host_addr + sizeof (*host_addr));
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h_addr_ptrs = (host_addr_list_t *)
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((char *) host_aliases + sizeof (*host_aliases));
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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, name, host_addr) <= 0)
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{
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__set_h_errno (HOST_NOT_FOUND);
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#ifndef HAVE_LOOKUP_BUFFER
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result = (struct hostent *) NULL;
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#endif
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goto done;
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}
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resbuf.h_name = strcpy (hostname, name);
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resbuf.h_aliases = *host_aliases;
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(*host_aliases)[0] = NULL;
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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;
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resbuf.h_length = addr_size;
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__set_h_errno (NETDB_SUCCESS);
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#ifdef HAVE_LOOKUP_BUFFER
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status = NSS_STATUS_SUCCESS;
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#else
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result = &resbuf;
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#endif
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goto done;
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}
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if (!isxdigit (*cp) && *cp != ':' && *cp != '.') break;
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}
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}
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}
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