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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;
+ }
+ }
+ }