build: move wrappers into platform module

+ Some fixups within the platform.c functions.
- need to check environment set on Windows.

Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Signed-off-by: David Sommerseth <davids@redhat.com>

1 files changed, 369 insertions, 0 deletions

diff --git a/src/openvpn/platform.c b/src/openvpn/platform.c
new file mode 100644
index 0000000..c79f680
--- /dev/null
+++ b/src/openvpn/platform.c
@@ -0,0 +1,369 @@
+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single TCP/UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#elif defined(_MSC_VER)
+#include "config-msvc.h"
+#endif
+
+#include "syshead.h"
+
+#include "buffer.h"
+#include "error.h"
+#include "win32.h"
+
+#include "memdbg.h"
+
+#include "platform.h"
+
+/* Redefine the top level directory of the filesystem
+   to restrict access to files for security */
+void
+platform_chroot (const char *path)
+{
+  if (path)
+    {
+#ifdef HAVE_CHROOT
+      const char *top = "/";
+      if (chroot (path))
+	msg (M_ERR, "chroot to '%s' failed", path);
+      if (platform_chdir (top))
+	msg (M_ERR, "cd to '%s' failed", top);
+      msg (M_INFO, "chroot to '%s' and cd to '%s' succeeded", path, top);
+#else
+      msg (M_FATAL, "Sorry but I can't chroot to '%s' because this operating system doesn't appear to support the chroot() system call", path);
+#endif
+    }
+}
+
+/* Get/Set UID of process */
+
+bool
+platform_user_get (const char *username, struct platform_state_user *state)
+{
+  bool ret = false;
+  CLEAR (*state);
+  if (username)
+    {
+#if defined(HAVE_GETPWNAM) && defined(HAVE_SETUID)
+      state->pw = getpwnam (username);
+      if (!state->pw)
+	msg (M_ERR, "failed to find UID for user %s", username);
+      state->username = username;
+      ret = true;
+#else
+      msg (M_FATAL, "cannot get UID for user %s -- platform lacks getpwname() or setuid() system calls", username);
+#endif
+    }
+  return ret;
+}
+
+void
+platform_user_set (const struct platform_state_user *state)
+{
+#if defined(HAVE_GETPWNAM) && defined(HAVE_SETUID)
+  if (state->username && state->pw)
+    {
+      if (setuid (state->pw->pw_uid))
+	msg (M_ERR, "setuid('%s') failed", state->username);
+      msg (M_INFO, "UID set to %s", state->username);
+    }
+#endif
+}
+
+/* Get/Set GID of process */
+
+bool
+platform_group_get (const char *groupname, struct platform_state_group *state)
+{
+  bool ret = false;
+  CLEAR (*state);
+  if (groupname)
+    {
+#if defined(HAVE_GETGRNAM) && defined(HAVE_SETGID)
+      state->gr = getgrnam (groupname);
+      if (!state->gr)
+	msg (M_ERR, "failed to find GID for group %s", groupname);
+      state->groupname = groupname;
+      ret = true;
+#else
+      msg (M_FATAL, "cannot get GID for group %s -- platform lacks getgrnam() or setgid() system calls", groupname);
+#endif
+    }
+  return ret;
+}
+
+void
+platform_group_set (const struct platform_state_group *state)
+{
+#if defined(HAVE_GETGRNAM) && defined(HAVE_SETGID)
+  if (state->groupname && state->gr)
+    {
+      if (setgid (state->gr->gr_gid))
+	msg (M_ERR, "setgid('%s') failed", state->groupname);
+      msg (M_INFO, "GID set to %s", state->groupname);
+#ifdef HAVE_SETGROUPS
+      {
+        gid_t gr_list[1];
+	gr_list[0] = state->gr->gr_gid;
+	if (setgroups (1, gr_list))
+	  msg (M_ERR, "setgroups('%s') failed", state->groupname);
+      }
+#endif
+    }
+#endif
+}
+
+/* Change process priority */
+void
+platform_nice (int niceval)
+{
+  if (niceval)
+    {
+#ifdef HAVE_NICE
+      errno = 0;
+      if (nice (niceval) < 0 && errno != 0)
+	msg (M_WARN | M_ERRNO, "WARNING: nice %d failed: %s", niceval, strerror(errno));
+      else
+	msg (M_INFO, "nice %d succeeded", niceval);
+#else
+      msg (M_WARN, "WARNING: nice %d failed (function not implemented)", niceval);
+#endif
+    }
+}
+
+/* Get current PID */
+unsigned int
+platform_getpid ()
+{
+#ifdef WIN32
+  return (unsigned int) GetCurrentProcessId ();
+#else
+#ifdef HAVE_GETPID
+  return (unsigned int) getpid ();
+#else
+  return 0;
+#endif
+#endif
+}
+
+/* Disable paging */
+void
+platform_mlockall(bool print_msg)
+{
+#ifdef HAVE_MLOCKALL
+  if (mlockall (MCL_CURRENT | MCL_FUTURE))
+    msg (M_WARN | M_ERRNO, "WARNING: mlockall call failed");
+  else if (print_msg)
+    msg (M_INFO, "mlockall call succeeded");
+#else
+  msg (M_WARN, "WARNING: mlockall call failed (function not implemented)");
+#endif
+}
+
+/*
+ * Wrapper for chdir library function
+ */
+int
+platform_chdir (const char* dir)
+{
+#ifdef HAVE_CHDIR
+#ifdef WIN32
+  int res;
+  struct gc_arena gc = gc_new ();
+  res = _wchdir (wide_string (dir, &gc));
+  gc_free (&gc);
+  return res;
+#else
+  return chdir (dir);
+#endif
+#else
+  return -1;
+#endif
+}
+
+/*
+ * convert system() return into a success/failure value
+ */
+bool
+platform_system_ok (int stat)
+{
+#ifdef WIN32
+  return stat == 0;
+#else
+  return stat != -1 && WIFEXITED (stat) && WEXITSTATUS (stat) == 0;
+#endif
+}
+
+/*
+ * did system() call execute the given command?
+ */
+bool
+platform_system_executed (int stat)
+{
+#ifdef WIN32
+  return stat != -1;
+#else
+  return stat != -1 && WEXITSTATUS (stat) != 127;
+#endif
+}
+
+int
+platform_access (const char *path, int mode)
+{
+#ifdef WIN32
+  struct gc_arena gc = gc_new ();
+  int ret = _waccess (wide_string (path, &gc), mode & ~X_OK);
+  gc_free (&gc);
+  return ret;
+#else
+  return access (path, mode);
+#endif
+}
+
+/*
+ * Go to sleep for n milliseconds.
+ */
+void
+platform_sleep_milliseconds (unsigned int n)
+{
+#ifdef WIN32
+  Sleep (n);
+#else
+  struct timeval tv;
+  tv.tv_sec = n / 1000;
+  tv.tv_usec = (n % 1000) * 1000;
+  select (0, NULL, NULL, NULL, &tv);
+#endif
+}
+
+/*
+ * Go to sleep indefinitely.
+ */
+void
+platform_sleep_until_signal (void)
+{
+#ifdef WIN32
+  ASSERT (0);
+#else
+  select (0, NULL, NULL, NULL, NULL);
+#endif
+}
+
+/* delete a file, return true if succeeded */
+bool
+platform_unlink (const char *filename)
+{
+#if defined(WIN32)
+  struct gc_arena gc = gc_new ();
+  BOOL ret = DeleteFileW (wide_string (filename, &gc));
+  gc_free (&gc);
+  return (ret != 0);
+#elif defined(HAVE_UNLINK)
+  return (unlink (filename) == 0);
+#else
+  return false;
+#endif
+}
+
+int platform_system(const char *command) {
+  int ret;
+#ifdef WIN32
+  struct gc_arena gc = gc_new ();
+  ret = _wsystem (wide_string (command, &gc));
+  gc_free (&gc);
+#else
+  ret = system (command);
+#endif
+  return ret;
+}
+
+int platform_putenv(char *string)
+{
+  int status;
+#if defined(WIN32)
+  struct gc_arena gc = gc_new ();
+  char *s = string_alloc(string, &gc);
+  char *value = strchr(s, '=');
+  if (value!=NULL)
+    {
+      *value = '\0';
+      value++;
+      if (*value == '\0')
+        value = NULL;
+    }
+
+  status = SetEnvironmentVariableW (wide_string (s, &gc),
+      wide_string (value, &gc)) ? 1: 0;
+  gc_free (&gc);
+#elif defined(HAVE_PUTENV)
+  void manage_env (char *str); /* TODO: Resolve properly */
+  status = putenv (string);
+  if (!status)
+    manage_env (string);
+#endif
+
+  return status;
+}
+
+FILE *
+platform_fopen (const char *path, const char *mode)
+{
+#ifdef WIN32
+  struct gc_arena gc = gc_new ();
+  FILE *f = _wfopen (wide_string (path, &gc), wide_string (mode, &gc));
+  gc_free (&gc);
+  return f;
+#else
+  return fopen(path, mode);
+#endif
+}
+
+int
+platform_open (const char *path, int flags, int mode)
+{
+#ifdef WIN32
+  struct gc_arena gc = gc_new ();
+  int fd = _wopen (wide_string (path, &gc), flags, mode);
+  gc_free (&gc);
+  return fd;
+#else
+  return open(path, flags, mode);
+#endif
+}
+
+int
+platform_stat (const char *path, platform_stat_t *buf)
+{
+#ifdef WIN32
+  struct gc_arena gc = gc_new ();
+  int res = _wstat (wide_string (path, &gc), buf);
+  gc_free (&gc);
+  return res;
+#else
+  return stat(path, buf);
+#endif
+}
+