Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 241 insertions, 0 deletions

diff --git a/REORG.TODO/nscd/nscd_getpw_r.c b/REORG.TODO/nscd/nscd_getpw_r.c
new file mode 100644
index 0000000000..b291d2fa44
--- /dev/null
+++ b/REORG.TODO/nscd/nscd_getpw_r.c
@@ -0,0 +1,241 @@
+/* Copyright (C) 1998-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Thorsten Kukuk <kukuk@uni-paderborn.de>, 1998.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <assert.h>
+#include <errno.h>
+#include <pwd.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <sys/un.h>
+#include <not-cancel.h>
+#include <_itoa.h>
+
+#include "nscd-client.h"
+#include "nscd_proto.h"
+
+int __nss_not_use_nscd_passwd;
+
+static int nscd_getpw_r (const char *key, size_t keylen, request_type type,
+			 struct passwd *resultbuf, char *buffer,
+			 size_t buflen, struct passwd **result)
+     internal_function;
+
+int
+__nscd_getpwnam_r (const char *name, struct passwd *resultbuf, char *buffer,
+		   size_t buflen, struct passwd **result)
+{
+  if (name == NULL)
+    return -1;
+
+  return nscd_getpw_r (name, strlen (name) + 1, GETPWBYNAME, resultbuf,
+		       buffer, buflen, result);
+}
+
+int
+__nscd_getpwuid_r (uid_t uid, struct passwd *resultbuf, char *buffer,
+		   size_t buflen, struct passwd **result)
+{
+  char buf[3 * sizeof (uid_t)];
+  buf[sizeof (buf) - 1] = '\0';
+  char *cp = _itoa_word (uid, buf + sizeof (buf) - 1, 10, 0);
+
+  return nscd_getpw_r (cp, buf + sizeof (buf) - cp, GETPWBYUID, resultbuf,
+		       buffer, buflen, result);
+}
+
+
+libc_locked_map_ptr (static, map_handle);
+/* Note that we only free the structure if necessary.  The memory
+   mapping is not removed since it is not visible to the malloc
+   handling.  */
+libc_freeres_fn (pw_map_free)
+{
+  if (map_handle.mapped != NO_MAPPING)
+    {
+      void *p = map_handle.mapped;
+      map_handle.mapped = NO_MAPPING;
+      free (p);
+    }
+}
+
+
+static int
+internal_function
+nscd_getpw_r (const char *key, size_t keylen, request_type type,
+	      struct passwd *resultbuf, char *buffer, size_t buflen,
+	      struct passwd **result)
+{
+  int gc_cycle;
+  int nretries = 0;
+
+  /* If the mapping is available, try to search there instead of
+     communicating with the nscd.  */
+  struct mapped_database *mapped;
+  mapped = __nscd_get_map_ref (GETFDPW, "passwd", &map_handle, &gc_cycle);
+
+ retry:;
+  const char *pw_name = NULL;
+  int retval = -1;
+  const char *recend = (const char *) ~UINTMAX_C (0);
+  pw_response_header pw_resp;
+
+  if (mapped != NO_MAPPING)
+    {
+      struct datahead *found = __nscd_cache_search (type, key, keylen, mapped,
+						    sizeof pw_resp);
+      if (found != NULL)
+	{
+	  pw_name = (const char *) (&found->data[0].pwdata + 1);
+	  pw_resp = found->data[0].pwdata;
+	  recend = (const char *) found->data + found->recsize;
+	  /* Now check if we can trust pw_resp fields.  If GC is
+	     in progress, it can contain anything.  */
+	  if (mapped->head->gc_cycle != gc_cycle)
+	    {
+	      retval = -2;
+	      goto out;
+	    }
+	}
+    }
+
+  int sock = -1;
+  if (pw_name == NULL)
+    {
+      sock = __nscd_open_socket (key, keylen, type, &pw_resp,
+				 sizeof (pw_resp));
+      if (sock == -1)
+	{
+	  __nss_not_use_nscd_passwd = 1;
+	  goto out;
+	}
+    }
+
+  /* No value found so far.  */
+  *result = NULL;
+
+  if (__glibc_unlikely (pw_resp.found == -1))
+    {
+      /* The daemon does not cache this database.  */
+      __nss_not_use_nscd_passwd = 1;
+      goto out_close;
+    }
+
+  if (pw_resp.found == 1)
+    {
+      /* Set the information we already have.  */
+      resultbuf->pw_uid = pw_resp.pw_uid;
+      resultbuf->pw_gid = pw_resp.pw_gid;
+
+      char *p = buffer;
+      /* get pw_name */
+      resultbuf->pw_name = p;
+      p += pw_resp.pw_name_len;
+      /* get pw_passwd */
+      resultbuf->pw_passwd = p;
+      p += pw_resp.pw_passwd_len;
+      /* get pw_gecos */
+      resultbuf->pw_gecos = p;
+      p += pw_resp.pw_gecos_len;
+      /* get pw_dir */
+      resultbuf->pw_dir = p;
+      p += pw_resp.pw_dir_len;
+      /* get pw_pshell */
+      resultbuf->pw_shell = p;
+      p += pw_resp.pw_shell_len;
+
+      ssize_t total = p - buffer;
+      if (__glibc_unlikely (pw_name + total > recend))
+	goto out_close;
+      if (__glibc_unlikely (buflen < total))
+	{
+	  __set_errno (ERANGE);
+	  retval = ERANGE;
+	  goto out_close;
+	}
+
+      retval = 0;
+      if (pw_name == NULL)
+	{
+	  ssize_t nbytes = __readall (sock, buffer, total);
+
+	  if (__glibc_unlikely (nbytes != total))
+	    {
+	      /* The `errno' to some value != ERANGE.  */
+	      __set_errno (ENOENT);
+	      retval = ENOENT;
+	    }
+	  else
+	    *result = resultbuf;
+	}
+      else
+	{
+	  /* Copy the various strings.  */
+	  memcpy (resultbuf->pw_name, pw_name, total);
+
+	  /* Try to detect corrupt databases.  */
+	  if (resultbuf->pw_name[pw_resp.pw_name_len - 1] != '\0'
+	      || resultbuf->pw_passwd[pw_resp.pw_passwd_len - 1] != '\0'
+	      || resultbuf->pw_gecos[pw_resp.pw_gecos_len - 1] != '\0'
+	      || resultbuf->pw_dir[pw_resp.pw_dir_len - 1] != '\0'
+	      || resultbuf->pw_shell[pw_resp.pw_shell_len - 1] != '\0')
+	    {
+	      /* We cannot use the database.  */
+	      retval = mapped->head->gc_cycle != gc_cycle ? -2 : -1;
+	      goto out_close;
+	    }
+
+	  *result = resultbuf;
+	}
+    }
+  else
+    {
+      /* Set errno to 0 to indicate no error, just no found record.  */
+      __set_errno (0);
+      /* Even though we have not found anything, the result is zero.  */
+      retval = 0;
+    }
+
+ out_close:
+  if (sock != -1)
+    close_not_cancel_no_status (sock);
+ out:
+  if (__nscd_drop_map_ref (mapped, &gc_cycle) != 0)
+    {
+      /* When we come here this means there has been a GC cycle while we
+	 were looking for the data.  This means the data might have been
+	 inconsistent.  Retry if possible.  */
+      if ((gc_cycle & 1) != 0 || ++nretries == 5 || retval == -1)
+	{
+	  /* nscd is just running gc now.  Disable using the mapping.  */
+	  if (atomic_decrement_val (&mapped->counter) == 0)
+	    __nscd_unmap (mapped);
+	  mapped = NO_MAPPING;
+	}
+
+      if (retval != -1)
+	goto retry;
+    }
+
+  return retval;
+}