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-rw-r--r--nss/digits_dots.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/nss/digits_dots.c b/nss/digits_dots.c
new file mode 100644
index 0000000000..b86f66cf4d
--- /dev/null
+++ b/nss/digits_dots.c
@@ -0,0 +1,273 @@
+/* Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by H.J. Lu <hjl@gnu.ai.mit.edu>, 1997.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+  /*
+   * disallow names consisting only of digits/dots, unless
+   * they end in a dot.
+   */
+  if (isdigit (name[0]) || (isxdigit (name[0]) || name[0] == ':'))
+    {
+      const char *cp;
+      char *hostname;
+      struct hostent *host;
+      typedef unsigned char host_addr_t [16];
+      host_addr_t *host_addr;
+      typedef char *host_addr_list_t [2];
+      host_addr_list_t *host_aliases;
+      host_addr_list_t *h_addr_ptrs;
+      size_t size_needed;
+      int addr_size;
+#ifndef HAVE_AF
+      int af = -1;
+#endif
+
+      switch (af)
+	{
+	case AF_INET:
+	  addr_size = INADDRSZ;
+	  break;
+
+	case AF_INET6:
+	  addr_size = IN6ADDRSZ;
+	  break;
+
+	default:
+	  af = (_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET;
+	  addr_size = (af == AF_INET6 ) ? IN6ADDRSZ : INADDRSZ;
+	  break;
+	}
+
+      size_needed = (sizeof (*host) + sizeof (*host_addr)
+		     + sizeof (*host_aliases) + sizeof (*h_addr_ptrs)
+		     + strlen (name) + 1);
+
+#ifdef HAVE_LOOKUP_BUFFER
+      if (buflen < size_needed)
+	{
+	  __set_errno (ERANGE);
+	  goto done;
+	}
+#else
+      if (buffer_size < size_needed)
+	{
+	  char *new_buf;
+	  buffer_size = size_needed;
+	  new_buf = realloc (buffer, buffer_size);
+
+	  if (new_buf == NULL)
+	    {
+	      save = errno;
+	      free (buffer);
+	      buffer = NULL;
+	      buffer_size = 0;
+	      __set_errno (save);
+	      result = (struct hostent *) NULL;
+	      goto done;
+	    }
+	  buffer = new_buf;
+	}
+#endif /* HAVE_LOOKUP_BUFFER */
+
+      memset (buffer, 0, size_needed);
+
+      host = (struct hostent *) buffer;
+      host_addr = (host_addr_t *) ((char *) host + sizeof (*host));
+      host_aliases = (host_addr_list_t *)
+	((char *) host_addr + sizeof (*host_addr));
+      h_addr_ptrs = (host_addr_list_t *)
+	((char *) host_aliases + sizeof (*host_aliases));
+      hostname = (char *) h_addr_ptrs + sizeof (*h_addr_ptrs);
+
+      if (isdigit (name[0]))
+	{
+	  for (cp = name;; ++cp)
+	    {
+	      if (!*cp)
+		{
+		  if (*--cp == '.') break;
+
+	/* All-numeric, no dot at the end. Fake up a hostent as if
+	   we'd actually done a lookup.  What if someone types
+	   255.255.255.255?  The test below will succeed
+	   spuriously... ???  */
+		  if (inet_pton (af, name, host_addr) <= 0)
+		    {
+		      __set_h_errno (HOST_NOT_FOUND);
+#ifndef HAVE_LOOKUP_BUFFER
+		      result = (struct hostent *) NULL;
+#endif
+		      goto done;
+		    }
+
+		  strcpy (hostname, name);
+		  host->h_name = hostname;
+		  host->h_aliases = *host_aliases;
+		  (*host_aliases)[0] = NULL;
+		  (*h_addr_ptrs)[0] = (char *)host_addr;
+		  (*h_addr_ptrs)[1] = (char *)0;
+		  host->h_addr_list = *h_addr_ptrs;
+		  if (_res.options & RES_USE_INET6 && af == AF_INET)
+		    {
+		      /* We need to change the IP v4 address into the
+			 IP v6 address.  */
+		      char tmp[INADDRSZ], *p = (char *) host_addr;
+		      int i;
+
+		      /* Save a copy of the IP v4 address. */
+		      memcpy (tmp, host_addr, INADDRSZ);
+		      /* Mark this ipv6 addr as a mapped ipv4. */
+		      for (i = 0; i < 10; i++)
+			*p++ = 0x00;
+		      *p++ = 0xff;
+		      *p++ = 0xff;
+		      /* Copy the IP v4 address. */
+		      memcpy (p, tmp, INADDRSZ);
+		      host->h_addrtype = AF_INET6;
+		      host->h_length = IN6ADDRSZ;
+		    }
+		  else
+		    {
+		      host->h_addrtype = af;
+		      host->h_length = addr_size;
+		    }
+		  __set_h_errno (NETDB_SUCCESS);
+#ifdef HAVE_LOOKUP_BUFFER
+		  status = NSS_STATUS_SUCCESS;
+#else
+		  result = host;
+#endif
+		  goto done;
+		}
+
+	      if (!isdigit (*cp) && *cp != '.') break;
+	    }
+	}
+
+      if (isxdigit (name[0]) || name[0] == ':')
+	{
+	  const char *cp;
+	  char *hostname;
+	  struct hostent *host;
+	  typedef unsigned char host_addr_t [16];
+	  host_addr_t *host_addr;
+	  typedef char *host_addr_list_t [2];
+	  host_addr_list_t *host_aliases;
+	  host_addr_list_t *h_addr_ptrs;
+	  size_t size_needed;
+	  int addr_size;
+#ifndef HAVE_AF
+	  int af = -1;
+#endif
+
+	  switch (af)
+	    {
+	    case AF_INET:
+	      addr_size = INADDRSZ;
+	      break;
+
+	    case AF_INET6:
+	      addr_size = IN6ADDRSZ;
+	      break;
+
+	    default:
+	      af = (_res.options & RES_USE_INET6) ? AF_INET6 : AF_INET;
+	      addr_size = (af == AF_INET6 ) ? IN6ADDRSZ : INADDRSZ;
+	      break;
+	    }
+
+	  size_needed = (sizeof (*host) + sizeof (*host_addr)
+			 + sizeof (*host_aliases) + sizeof (*h_addr_ptrs)
+			 + strlen (name) + 1);
+
+#ifdef HAVE_LOOKUP_BUFFER
+	  if (buflen < size_needed)
+	    {
+	      __set_errno (ERANGE);
+	      goto done;
+	    }
+#else
+	  if (buffer_size < size_needed)
+	    {
+	      char *new_buf;
+	      buffer_size = size_needed;
+	      new_buf = realloc (buffer, buffer_size);
+
+	      if (new_buf == NULL)
+		{
+		  save = errno;
+		  free (buffer);
+		  __set_errno (save);
+		  buffer = NULL;
+		  buffer_size = 0;
+		  result = (struct hostent *) NULL;
+		  goto done;
+		}
+	      buffer = new_buf;
+	    }
+#endif /* HAVE_LOOKUP_BUFFER */
+
+	  memset (buffer, 0, size_needed);
+
+	  host = (struct hostent *) buffer;
+	  host_addr = (host_addr_t *) ((char *) host + sizeof (*host));
+	  host_aliases = (host_addr_list_t *)
+	    ((char *) host_addr + sizeof (*host_addr));
+	  h_addr_ptrs = (host_addr_list_t *)
+	    ((char *) host_aliases + sizeof (*host_aliases));
+	  hostname = (char *) h_addr_ptrs + sizeof (*h_addr_ptrs);
+
+	  for (cp = name;; ++cp)
+	    {
+	      if (!*cp)
+		{
+		  if (*--cp == '.') break;
+
+		  /* All-IPv6-legal, no dot at the end. Fake up a
+		     hostent as if we'd actually done a lookup.  */
+		  if (inet_pton (af, name, host_addr) <= 0)
+		    {
+		      __set_h_errno (HOST_NOT_FOUND);
+#ifndef HAVE_LOOKUP_BUFFER
+		      result = (struct hostent *) NULL;
+#endif
+		      goto done;
+		    }
+
+		  strcpy (hostname, name);
+		  host->h_name = hostname;
+		  host->h_aliases = *host_aliases;
+		  (*host_aliases)[0] = NULL;
+		  (*h_addr_ptrs)[0] = (char *) host_addr;
+		  (*h_addr_ptrs)[1] = (char *) 0;
+		  host->h_addr_list = *h_addr_ptrs;
+		  host->h_addrtype = af;
+		  host->h_length = addr_size;
+		  __set_h_errno (NETDB_SUCCESS);
+#ifdef HAVE_LOOKUP_BUFFER
+		  status = NSS_STATUS_SUCCESS;
+#else
+		  result = host;
+#endif
+		  goto done;
+		}
+
+	      if (!isxdigit (*cp) && *cp != ':' && *cp != '.') break;
+	    }
+	}
+    }
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