1 files changed, 302 insertions, 0 deletions
diff --git a/nscd/nscd_gethst_r.c b/nscd/nscd_gethst_r.c
new file mode 100644
index 0000000000..f78b104103
--- /dev/null
+++ b/nscd/nscd_gethst_r.c
@@ -0,0 +1,302 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   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.  */
+
+#include <errno.h>
+#include <netdb.h>
+#include <resolv.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <arpa/nameser.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <sys/un.h>
+
+#include "nscd.h"
+#include "nscd_proto.h"
+
+int __nss_not_use_nscd_hosts;
+
+static int nscd_gethst_r (const char *key, size_t keylen, request_type type,
+			  struct hostent *resultbuf, char *buffer,
+			  size_t buflen, int *h_errnop);
+
+
+int
+__nscd_gethostbyname_r (const char *name, struct hostent *resultbuf,
+			char *buffer, size_t buflen, int *h_errnop)
+{
+  request_type reqtype;
+
+  reqtype = (_res.options & RES_USE_INET6) ? GETHOSTBYNAMEv6 : GETHOSTBYNAME;
+
+  return nscd_gethst_r (name, strlen (name) + 1, reqtype, resultbuf,
+			buffer, buflen, h_errnop);
+}
+
+
+int
+__nscd_gethostbyname2_r (const char *name, int af, struct hostent *resultbuf,
+			 char *buffer, size_t buflen, int *h_errnop)
+{
+  request_type reqtype;
+
+  reqtype = af == AF_INET6 ? GETHOSTBYNAMEv6 : GETHOSTBYNAME;
+
+  return nscd_gethst_r (name, strlen (name) + 1, reqtype, resultbuf,
+			buffer, buflen, h_errnop);
+}
+
+
+int
+__nscd_gethostbyaddr_r (const char *addr, int len, int type,
+			struct hostent *resultbuf, char *buffer, size_t buflen,
+			int *h_errnop)
+{
+  request_type reqtype;
+
+  if (!((len == INADDRSZ && type == AF_INET)
+	|| (len == IN6ADDRSZ && type == AF_INET6)))
+    /* LEN and TYPE do not match.  */
+    return 1;
+
+  reqtype = type == AF_INET6 ? GETHOSTBYADDRv6 : GETHOSTBYADDR;
+
+  return nscd_gethst_r (addr, len, reqtype, resultbuf, buffer, buflen,
+			h_errnop);
+}
+
+
+/* Create a socket connected to a name. */
+static int
+open_socket (void)
+{
+  struct sockaddr_un addr;
+  int sock;
+  int saved_errno = errno;
+
+  sock = __socket (PF_UNIX, SOCK_STREAM, 0);
+  if (sock < 0)
+    {
+      __set_errno (saved_errno);
+      return -1;
+    }
+
+  addr.sun_family = AF_UNIX;
+  strcpy (addr.sun_path, _PATH_NSCDSOCKET);
+  if (__connect (sock, (struct sockaddr *) &addr, sizeof (addr)) < 0)
+    {
+      __close (sock);
+      __set_errno (saved_errno);
+      return -1;
+    }
+
+  return sock;
+}
+
+
+static int
+nscd_gethst_r (const char *key, size_t keylen, request_type type,
+	       struct hostent *resultbuf, char *buffer, size_t buflen,
+	       int *h_errnop)
+{
+  int sock = open_socket ();
+  hst_response_header hst_resp;
+  request_header req;
+  ssize_t nbytes;
+
+  if (sock == -1)
+    {
+      __nss_not_use_nscd_group = 1;
+      return 1;
+    }
+
+  req.version = NSCD_VERSION;
+  req.type = type;
+  req.key_len = keylen;
+  nbytes = __write (sock, &req, sizeof (request_header));
+  if (nbytes != sizeof (request_header))
+    {
+      __close (sock);
+      return 1;
+    }
+
+  nbytes = __write (sock, key, req.key_len);
+  if (nbytes != req.key_len)
+    {
+      __close (sock);
+      return 1;
+    }
+
+  nbytes = __read (sock, &hst_resp, sizeof (hst_response_header));
+  if (nbytes != sizeof (hst_response_header))
+    {
+      __close (sock);
+      return 1;
+    }
+
+  if (hst_resp.found == -1)
+    {
+      /* The daemon does not cache this database.  */
+      __close (sock);
+      __nss_not_use_nscd_hosts = 1;
+      return 1;
+    }
+
+  if (hst_resp.found == 1)
+    {
+      struct iovec vec[4];
+      size_t *aliases_len;
+      char *cp = buffer;
+      uintptr_t align;
+      size_t total_len;
+      ssize_t cnt;
+      char *ignore;
+      int n;
+
+      /* A first check whether the buffer is sufficently large is possible.  */
+      /* Now allocate the buffer the array for the group members.  We must
+	 align the pointer.  */
+      align = ((__alignof__ (char *) - (cp - ((char *) 0)))
+	       & (__alignof__ (char *) - 1));
+      if (buflen < (align + hst_resp.h_name_len
+		    + ((hst_resp.h_aliases_cnt + hst_resp.h_addr_list_cnt + 2)
+		       * sizeof (char *))
+		    + hst_resp.h_addr_list_cnt * (type == AF_INET
+						  ? INADDRSZ : IN6ADDRSZ)))
+	{
+	no_room:
+	  __set_errno (ERANGE);
+	  __close (sock);
+	  return -1;
+	}
+      cp += align;
+
+      /* Prepare the result as far as we can.  */
+      resultbuf->h_aliases = (char **) cp;
+      cp += (hst_resp.h_aliases_cnt + 1) * sizeof (char *);
+      resultbuf->h_addr_list = (char **) cp;
+      cp += (hst_resp.h_addr_list_cnt + 1) * sizeof (char *);
+
+      resultbuf->h_name = cp;
+      cp += hst_resp.h_name_len;
+      vec[0].iov_base = resultbuf->h_name;
+      vec[0].iov_len = hst_resp.h_name_len;
+
+      aliases_len = alloca (hst_resp.h_aliases_cnt * sizeof (size_t));
+      vec[1].iov_base = aliases_len;
+      vec[1].iov_len = hst_resp.h_aliases_cnt * sizeof (size_t);
+
+      total_len = (hst_resp.h_name_len
+		   + hst_resp.h_aliases_cnt * sizeof (size_t));
+
+      n = 2;
+      if (type == GETHOSTBYADDR || type == GETHOSTBYNAME)
+	{
+	  vec[2].iov_base = cp;
+	  vec[2].iov_len = hst_resp.h_addr_list_cnt * INADDRSZ;
+
+	  ignore = alloca (hst_resp.h_addr_list_cnt * IN6ADDRSZ);
+	  vec[3].iov_base = ignore;
+	  vec[3].iov_len = hst_resp.h_addr_list_cnt * IN6ADDRSZ;
+
+	  for (cnt = 0; cnt < hst_resp.h_addr_list_cnt; ++cnt)
+	    {
+	      resultbuf->h_addr_list[cnt] = cp;
+	      cp += INADDRSZ;
+	    }
+
+	  resultbuf->h_addrtype = AF_INET;
+	  resultbuf->h_length = INADDRSZ;
+
+	  total_len += hst_resp.h_addr_list_cnt * (INADDRSZ + IN6ADDRSZ);
+
+	  n = 4;
+	}
+      else
+	{
+	  if (hst_resp.h_length == INADDRSZ)
+	    {
+	      ignore = alloca (hst_resp.h_addr_list_cnt * INADDRSZ);
+	      vec[2].iov_base = ignore;
+	      vec[2].iov_len = hst_resp.h_addr_list_cnt * INADDRSZ;
+
+	      total_len += hst_resp.h_addr_list_cnt * INADDRSZ;
+
+	      n = 3;
+	    }
+
+	  vec[n].iov_base = cp;
+	  vec[n].iov_len = hst_resp.h_addr_list_cnt * IN6ADDRSZ;
+
+	  for (cnt = 0; cnt < hst_resp.h_addr_list_cnt; ++cnt)
+	    {
+	      resultbuf->h_addr_list[cnt] = cp;
+	      cp += IN6ADDRSZ;
+	    }
+
+	  resultbuf->h_addrtype = AF_INET6;
+	  resultbuf->h_length = IN6ADDRSZ;
+
+	  total_len += hst_resp.h_addr_list_cnt * IN6ADDRSZ;
+
+	  ++n;
+	}
+      resultbuf->h_addr_list[cnt] = NULL;
+
+      if (__readv (sock, vec, n) != total_len)
+	{
+	  __close (sock);
+	  return 1;
+	}
+
+      /*  Now we also can read the aliases.  */
+      total_len = 0;
+      for (cnt = 0; cnt < hst_resp.h_aliases_cnt; ++cnt)
+	{
+	  resultbuf->h_aliases[cnt] = cp;
+	  cp += aliases_len[cnt];
+	  total_len += aliases_len[cnt];
+	}
+      resultbuf->h_aliases[cnt] = NULL;
+
+      /* See whether this would exceed the buffer capacity.  */
+      if (cp > buffer + buflen)
+	goto no_room;
+
+      /* And finally read the aliases.  */
+      if (__read (sock, resultbuf->h_aliases[0], total_len) != total_len)
+	{
+	  __close (sock);
+	  return 1;
+	}
+
+      __close (sock);
+      return 0;
+    }
+  else
+    {
+      /* Store the error number.  */
+      *h_errnop = hst_resp.error;
+
+      __close (sock);
+      return -1;
+    }
+}