Imported Upstream version 0.9.2upstream/0.9.2

1 files changed, 538 insertions, 0 deletions

diff --git a/src/util/os_installation.c b/src/util/os_installation.c
new file mode 100644
index 0000000..b82813d
--- /dev/null
+++ b/src/util/os_installation.c
@@ -0,0 +1,538 @@
+/*
+     This file is part of GNUnet.
+     (C) 2006 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 2, or (at your
+     option) any later version.
+
+     GNUnet 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 GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file src/util/os_installation.c
+ * @brief get paths used by the program
+ * @author Milan
+ */
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "platform.h"
+#include "gnunet_common.h"
+#include "gnunet_configuration_lib.h"
+#include "gnunet_disk_lib.h"
+#include "gnunet_os_lib.h"
+#if DARWIN
+#include <mach-o/ldsyms.h>
+#include <mach-o/dyld.h>
+#endif
+
+#define LOG(kind,...) GNUNET_log_from (kind, "util", __VA_ARGS__)
+
+#define LOG_STRERROR_FILE(kind,syscall,filename) GNUNET_log_from_strerror_file (kind, "util", syscall, filename)
+
+#if LINUX
+/**
+ * Try to determine path by reading /proc/PID/exe
+ */
+static char *
+get_path_from_proc_maps ()
+{
+  char fn[64];
+  char line[1024];
+  char dir[1024];
+  FILE *f;
+  char *lgu;
+
+  GNUNET_snprintf (fn, sizeof (fn), "/proc/%u/maps", getpid ());
+  f = FOPEN (fn, "r");
+  if (f == NULL)
+    return NULL;
+  while (NULL != fgets (line, sizeof (line), f))
+  {
+    if ((1 ==
+         sscanf (line, "%*x-%*x %*c%*c%*c%*c %*x %*2u:%*2u %*u%*[ ]%s", dir)) &&
+        (NULL != (lgu = strstr (dir, "libgnunetutil"))))
+    {
+      lgu[0] = '\0';
+      FCLOSE (f);
+      return GNUNET_strdup (dir);
+    }
+  }
+  FCLOSE (f);
+  return NULL;
+}
+
+/**
+ * Try to determine path by reading /proc/PID/exe
+ */
+static char *
+get_path_from_proc_exe ()
+{
+  char fn[64];
+  char lnk[1024];
+  ssize_t size;
+
+  GNUNET_snprintf (fn, sizeof (fn), "/proc/%u/exe", getpid ());
+  size = readlink (fn, lnk, sizeof (lnk) - 1);
+  if (size <= 0)
+  {
+    LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_ERROR, "readlink", fn);
+    return NULL;
+  }
+  GNUNET_assert (size < sizeof (lnk));
+  lnk[size] = '\0';
+  while ((lnk[size] != '/') && (size > 0))
+    size--;
+  if ((size < 4) || (lnk[size - 4] != '/'))
+  {
+    /* not installed in "/bin/" -- binary path probably useless */
+    return NULL;
+  }
+  lnk[size] = '\0';
+  return GNUNET_strdup (lnk);
+}
+#endif
+
+#if WINDOWS
+/**
+ * Try to determine path with win32-specific function
+ */
+static char *
+get_path_from_module_filename ()
+{
+  wchar_t path[4097];
+  char upath[4097];
+  wchar_t *idx;
+
+  GetModuleFileNameW (NULL, path, sizeof (path) - 1);
+  idx = path + wcslen (path);
+  while ((idx > path) && (*idx != L'\\') && (*idx != L'/'))
+    idx--;
+  *idx = L'\0';
+  upath[0] = '\0';
+  WideCharToMultiByte (CP_UTF8, 0, path, -1, upath, 4097, NULL, NULL);
+
+  return GNUNET_strdup (upath);
+}
+#endif
+
+#if DARWIN
+typedef int (*MyNSGetExecutablePathProto) (char *buf, size_t * bufsize);
+
+static char *
+get_path_from_NSGetExecutablePath ()
+{
+  static char zero = '\0';
+  char *path;
+  size_t len;
+  MyNSGetExecutablePathProto func;
+  int ret;
+
+  path = NULL;
+  func =
+      (MyNSGetExecutablePathProto) dlsym (RTLD_DEFAULT, "_NSGetExecutablePath");
+  if (!func)
+    return NULL;
+  path = &zero;
+  len = 0;
+  /* get the path len, including the trailing \0 */
+  func (path, &len);
+  if (len == 0)
+    return NULL;
+  path = GNUNET_malloc (len);
+  ret = func (path, &len);
+  if (ret != 0)
+  {
+    GNUNET_free (path);
+    return NULL;
+  }
+  len = strlen (path);
+  while ((path[len] != '/') && (len > 0))
+    len--;
+  path[len] = '\0';
+  return path;
+}
+
+static char *
+get_path_from_dyld_image ()
+{
+  const char *path;
+  char *p, *s;
+  int i;
+  int c;
+
+  p = NULL;
+  c = _dyld_image_count ();
+  for (i = 0; i < c; i++)
+  {
+    if (_dyld_get_image_header (i) == &_mh_dylib_header)
+    {
+      path = _dyld_get_image_name (i);
+      if (path != NULL && strlen (path) > 0)
+      {
+        p = GNUNET_strdup (path);
+        s = p + strlen (p);
+        while ((s > p) && (*s != '/'))
+          s--;
+        s++;
+        *s = '\0';
+      }
+      break;
+    }
+  }
+  return p;
+}
+#endif
+
+/**
+ * Return the actual path to a file found in the current
+ * PATH environment variable.
+ *
+ * @param binary the name of the file to find
+ * @return path to binary, NULL if not found
+ */
+static char *
+get_path_from_PATH (const char *binary)
+{
+  char *path;
+  char *pos;
+  char *end;
+  char *buf;
+  const char *p;
+
+  p = getenv ("PATH");
+  if (p == NULL)
+    return NULL;
+  path = GNUNET_strdup (p);     /* because we write on it */
+  buf = GNUNET_malloc (strlen (path) + 20);
+  pos = path;
+  while (NULL != (end = strchr (pos, PATH_SEPARATOR)))
+  {
+    *end = '\0';
+    sprintf (buf, "%s/%s", pos, binary);
+    if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
+    {
+      pos = GNUNET_strdup (pos);
+      GNUNET_free (buf);
+      GNUNET_free (path);
+      return pos;
+    }
+    pos = end + 1;
+  }
+  sprintf (buf, "%s/%s", pos, binary);
+  if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
+  {
+    pos = GNUNET_strdup (pos);
+    GNUNET_free (buf);
+    GNUNET_free (path);
+    return pos;
+  }
+  GNUNET_free (buf);
+  GNUNET_free (path);
+  return NULL;
+}
+
+static char *
+get_path_from_GNUNET_PREFIX ()
+{
+  const char *p;
+
+  p = getenv ("GNUNET_PREFIX");
+  if (p != NULL)
+    return GNUNET_strdup (p);
+  return NULL;
+}
+
+/**
+ * @brief get the path to GNUnet bin/ or lib/, prefering the lib/ path
+ * @author Milan
+ *
+ * @return a pointer to the executable path, or NULL on error
+ */
+static char *
+os_get_gnunet_path ()
+{
+  char *ret;
+
+  ret = get_path_from_GNUNET_PREFIX ();
+  if (ret != NULL)
+    return ret;
+#if LINUX
+  ret = get_path_from_proc_maps ();
+  if (ret != NULL)
+    return ret;
+  ret = get_path_from_proc_exe ();
+  if (ret != NULL)
+    return ret;
+#endif
+#if WINDOWS
+  ret = get_path_from_module_filename ();
+  if (ret != NULL)
+    return ret;
+#endif
+#if DARWIN
+  ret = get_path_from_dyld_image ();
+  if (ret != NULL)
+    return ret;
+  ret = get_path_from_NSGetExecutablePath ();
+  if (ret != NULL)
+    return ret;
+#endif
+  ret = get_path_from_PATH ("gnunet-arm");
+  if (ret != NULL)
+    return ret;
+  /* other attempts here */
+  LOG (GNUNET_ERROR_TYPE_ERROR,
+       _
+       ("Could not determine installation path for %s.  Set `%s' environment variable.\n"),
+       "GNUnet", "GNUNET_PREFIX");
+  return NULL;
+}
+
+/*
+ * @brief get the path to current app's bin/
+ * @author Milan
+ *
+ * @return a pointer to the executable path, or NULL on error
+ */
+static char *
+os_get_exec_path ()
+{
+  char *ret;
+
+  ret = NULL;
+#if LINUX
+  ret = get_path_from_proc_exe ();
+  if (ret != NULL)
+    return ret;
+#endif
+#if WINDOWS
+  ret = get_path_from_module_filename ();
+  if (ret != NULL)
+    return ret;
+#endif
+#if DARWIN
+  ret = get_path_from_NSGetExecutablePath ();
+  if (ret != NULL)
+    return ret;
+#endif
+  /* other attempts here */
+  return ret;
+}
+
+
+
+/**
+ * @brief get the path to a specific GNUnet installation directory or,
+ * with GNUNET_IPK_SELF_PREFIX, the current running apps installation directory
+ * @author Milan
+ * @return a pointer to the dir path (to be freed by the caller)
+ */
+char *
+GNUNET_OS_installation_get_path (enum GNUNET_OS_InstallationPathKind dirkind)
+{
+  size_t n;
+  const char *dirname;
+  char *execpath = NULL;
+  char *tmp;
+  int isbasedir;
+
+  /* if wanted, try to get the current app's bin/ */
+  if (dirkind == GNUNET_OS_IPK_SELF_PREFIX)
+    execpath = os_get_exec_path ();
+
+  /* try to get GNUnet's bin/ or lib/, or if previous was unsuccessful some
+   * guess for the current app */
+  if (execpath == NULL)
+    execpath = os_get_gnunet_path ();
+
+  if (execpath == NULL)
+    return NULL;
+
+  n = strlen (execpath);
+  if (n == 0)
+  {
+    /* should never happen, but better safe than sorry */
+    GNUNET_free (execpath);
+    return NULL;
+  }
+  /* remove filename itself */
+  while ((n > 1) && (execpath[n - 1] == DIR_SEPARATOR))
+    execpath[--n] = '\0';
+
+  isbasedir = 1;
+  if ((n > 5) &&
+      ((0 == strcasecmp (&execpath[n - 5], "lib32")) ||
+       (0 == strcasecmp (&execpath[n - 5], "lib64"))))
+  {
+    if (dirkind != GNUNET_OS_IPK_LIBDIR)
+    {
+      /* strip '/lib32' or '/lib64' */
+      execpath[n - 5] = '\0';
+      n -= 5;
+    }
+    else
+      isbasedir = 0;
+  }
+  else if ((n > 3) &&
+           ((0 == strcasecmp (&execpath[n - 3], "bin")) ||
+            (0 == strcasecmp (&execpath[n - 3], "lib"))))
+  {
+    /* strip '/bin' or '/lib' */
+    execpath[n - 3] = '\0';
+    n -= 3;
+  }
+  /* in case this was a directory named foo-bin, remove "foo-" */
+  while ((n > 1) && (execpath[n - 1] == DIR_SEPARATOR))
+    execpath[--n] = '\0';
+  switch (dirkind)
+  {
+  case GNUNET_OS_IPK_PREFIX:
+  case GNUNET_OS_IPK_SELF_PREFIX:
+    dirname = DIR_SEPARATOR_STR;
+    break;
+  case GNUNET_OS_IPK_BINDIR:
+    dirname = DIR_SEPARATOR_STR "bin" DIR_SEPARATOR_STR;
+    break;
+  case GNUNET_OS_IPK_LIBDIR:
+    if (isbasedir)
+      dirname =
+          DIR_SEPARATOR_STR "lib" DIR_SEPARATOR_STR "gnunet" DIR_SEPARATOR_STR;
+    else
+      dirname = DIR_SEPARATOR_STR "gnunet" DIR_SEPARATOR_STR;
+    break;
+  case GNUNET_OS_IPK_DATADIR:
+    dirname =
+        DIR_SEPARATOR_STR "share" DIR_SEPARATOR_STR "gnunet" DIR_SEPARATOR_STR;
+    break;
+  case GNUNET_OS_IPK_LOCALEDIR:
+    dirname =
+        DIR_SEPARATOR_STR "share" DIR_SEPARATOR_STR "locale" DIR_SEPARATOR_STR;
+    break;
+  case GNUNET_OS_IPK_ICONDIR:
+    dirname =
+        DIR_SEPARATOR_STR "share" DIR_SEPARATOR_STR "icons" DIR_SEPARATOR_STR;
+    break;
+  case GNUNET_OS_IPK_DOCDIR:
+    dirname =
+        DIR_SEPARATOR_STR "share" DIR_SEPARATOR_STR "doc" DIR_SEPARATOR_STR \
+        "gnunet" DIR_SEPARATOR_STR;
+    break;
+  default:
+    GNUNET_free (execpath);
+    return NULL;
+  }
+  tmp = GNUNET_malloc (strlen (execpath) + strlen (dirname) + 1);
+  sprintf (tmp, "%s%s", execpath, dirname);
+  GNUNET_free (execpath);
+  return tmp;
+}
+
+
+/**
+ * Check whether an executable exists and possibly
+ * if the suid bit is set on the file.
+ * Attempts to find the file using the current
+ * PATH environment variable as a search path.
+ *
+ * @param binary the name of the file to check
+ * @return GNUNET_YES if the file is SUID,
+ *         GNUNET_NO if not SUID (but binary exists)
+ *         GNUNET_SYSERR on error (no such binary or not executable)
+ */
+int
+GNUNET_OS_check_helper_binary (const char *binary)
+{
+  struct stat statbuf;
+  char *p;
+  char *pf;
+
+#ifdef MINGW
+  SOCKET rawsock;
+  char *binaryexe;
+
+  GNUNET_asprintf (&binaryexe, "%s.exe", binary);
+  p = get_path_from_PATH (binaryexe);
+  if (p != NULL)
+  {
+    GNUNET_asprintf (&pf, "%s/%s", p, binaryexe);
+    GNUNET_free (p);
+    p = pf;
+  }
+  GNUNET_free (binaryexe);
+#else
+  p = get_path_from_PATH (binary);
+  if (p != NULL)
+  {
+    GNUNET_asprintf (&pf, "%s/%s", p, binary);
+    GNUNET_free (p);
+    p = pf;
+  }
+#endif
+  if (p == NULL)
+  {
+    LOG (GNUNET_ERROR_TYPE_INFO, _("Could not find binary `%s' in PATH!\n"),
+         binary);
+    return GNUNET_SYSERR;
+  }
+  if (0 != ACCESS (p, X_OK))
+  {
+    LOG (GNUNET_ERROR_TYPE_WARNING, _("access (%s, X_OK) failed: %s\n"), p,
+         STRERROR (errno));
+    GNUNET_free (p);
+    return GNUNET_SYSERR;
+  }
+#ifndef MINGW
+  if (0 == getuid ())
+  {
+    /* as we run as root, we don't insist on SUID */
+    GNUNET_free (p);
+    return GNUNET_OK;
+  }
+#endif
+  if (0 != STAT (p, &statbuf))
+  {
+    LOG (GNUNET_ERROR_TYPE_WARNING, _("stat (%s) failed: %s\n"), p,
+         STRERROR (errno));
+    GNUNET_free (p);
+    return GNUNET_SYSERR;
+  }
+#ifndef MINGW
+  if ((0 != (statbuf.st_mode & S_ISUID)) && (statbuf.st_uid == 0))
+  {
+    GNUNET_free (p);
+    return GNUNET_YES;
+  }
+  /* binary exists, but not SUID */
+  GNUNET_free (p);
+  return GNUNET_NO;
+#else
+  GNUNET_free (p);
+  rawsock = socket (AF_INET, SOCK_RAW, IPPROTO_ICMP);
+  if (INVALID_SOCKET == rawsock)
+  {
+    DWORD err = GetLastError ();
+
+    LOG (GNUNET_ERROR_TYPE_INFO,
+         "socket (AF_INET, SOCK_RAW, IPPROTO_ICMP) failed! GLE = %d\n", err);
+    return GNUNET_NO;           /* not running as administrator */
+  }
+  closesocket (rawsock);
+  return GNUNET_YES;
+#endif
+}
+
+
+/* end of os_installation.c */