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|
/*
This file is part of GNUnet.
Copyright (C) 2006-2018 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file src/util/os_installation.c
* @brief get paths used by the program
* @author Milan
* @author Christian Fuchs
* @author Christian Grothoff
* @author Matthias Wachs
* @author Heikki Lindholm
* @author LRN
*/
#include <sys/stat.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <unistr.h> /* for u16_to_u8 */
#include "platform.h"
#include "gnunet_util_lib.h"
#if DARWIN
#include <mach-o/ldsyms.h>
#include <mach-o/dyld.h>
#endif
#define LOG(kind, ...) \
GNUNET_log_from (kind, "util-os-installation", __VA_ARGS__)
#define LOG_STRERROR_FILE(kind, syscall, filename) \
GNUNET_log_from_strerror_file (kind, \
"util-os-installation", \
syscall, \
filename)
/**
* Default project data used for installation path detection
* for GNUnet (core).
*/
static const struct GNUNET_OS_ProjectData default_pd = {
.libname = "libgnunetutil",
.project_dirname = "gnunet",
.binary_name = "gnunet-arm",
.version = PACKAGE_VERSION " " VCS_VERSION,
.env_varname = "GNUNET_PREFIX",
.base_config_varname = "GNUNET_BASE_CONFIG",
.bug_email = "gnunet-developers@gnu.org",
.homepage = "http://www.gnu.org/s/gnunet/",
.config_file = "gnunet.conf",
.user_config_file = "~/.config/gnunet.conf",
.is_gnu = 1,
.gettext_domain = "gnunet",
.gettext_path = NULL,
.agpl_url = GNUNET_AGPL_URL,
};
/**
* Which project data do we currently use for installation
* path detection? Never NULL.
*/
static const struct GNUNET_OS_ProjectData *current_pd = &default_pd;
/**
* Whether or not gettext has been initialized for the library.
* Note that the gettext initialization done within
* GNUNET_PROGRAM_run2 is for the specific application.
*/
static int gettextinit = 0;
/**
* Return default project data used by 'libgnunetutil' for GNUnet.
*/
const struct GNUNET_OS_ProjectData *
GNUNET_OS_project_data_default (void)
{
return &default_pd;
}
/**
* @return current project data.
*/
const struct GNUNET_OS_ProjectData *
GNUNET_OS_project_data_get ()
{
if (0 == gettextinit)
{
char *path = GNUNET_OS_installation_get_path (GNUNET_OS_IPK_LOCALEDIR);
if (NULL != path)
bindtextdomain (PACKAGE, path);
GNUNET_free (path);
gettextinit = 1;
}
return current_pd;
}
/**
* Setup OS subsystem with project data.
*
* @param pd project data used to determine paths
*/
void
GNUNET_OS_init (const struct GNUNET_OS_ProjectData *pd)
{
if (0 == gettextinit)
{
char *path = GNUNET_OS_installation_get_path (GNUNET_OS_IPK_LOCALEDIR);
if (NULL != path)
bindtextdomain (PACKAGE, path);
GNUNET_free (path);
gettextinit = 1;
}
GNUNET_assert (NULL != pd);
current_pd = pd;
}
#ifdef __linux__
/**
* Try to determine path by reading /proc/PID/exe
*
* @return NULL on error
*/
static char *
get_path_from_proc_maps (void)
{
char fn[64];
char line[1024];
char dir[1024];
FILE *f;
char *lgu;
if (NULL == current_pd->libname)
return NULL;
GNUNET_snprintf (fn,
sizeof(fn),
"/proc/%u/maps",
getpid ());
if (NULL == (f = fopen (fn, "r")))
return NULL;
while (NULL != fgets (line, sizeof(line), f))
{
if ((1 == sscanf (line,
"%*p-%*p %*c%*c%*c%*c %*x %*x:%*x %*u%*[ ]%1023s",
dir)) &&
(NULL != (lgu = strstr (dir,
current_pd->libname))))
{
lgu[0] = '\0';
fclose (f);
return GNUNET_strdup (dir);
}
}
fclose (f);
return NULL;
}
/**
* Try to determine path by reading /proc/PID/exe
*
* @return NULL on error
*/
static char *
get_path_from_proc_exe (void)
{
char fn[64];
char lnk[1024];
ssize_t size;
char *lep;
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_t) size) < sizeof(lnk));
lnk[size] = '\0';
while ((lnk[size] != '/') && (size > 0))
size--;
GNUNET_asprintf (&lep, "/%s/libexec/", current_pd->project_dirname);
/* test for being in lib/gnunet/libexec/ or lib/MULTIARCH/gnunet/libexec */
if ((((size_t) size) > strlen (lep)) &&
(0 == strcmp (lep, &lnk[size - strlen (lep)])))
size -= strlen (lep) - 1;
GNUNET_free (lep);
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 DARWIN
/**
* Signature of the '_NSGetExecutablePath" function.
*
* @param buf where to write the path
* @param number of bytes available in @a buf
* @return 0 on success, otherwise desired number of bytes is stored in 'bufsize'
*/
typedef int (*MyNSGetExecutablePathProto) (char *buf, size_t *bufsize);
/**
* Try to obtain the path of our executable using '_NSGetExecutablePath'.
*
* @return NULL on error
*/
static char *
get_path_from_NSGetExecutablePath (void)
{
static char zero = '\0';
char *path;
size_t len;
MyNSGetExecutablePathProto func;
path = NULL;
if (NULL ==
(func = (MyNSGetExecutablePathProto) dlsym (RTLD_DEFAULT,
"_NSGetExecutablePath")))
return NULL;
path = &zero;
len = 0;
/* get the path len, including the trailing \0 */
(void) func (path, &len);
if (0 == len)
return NULL;
path = GNUNET_malloc (len);
if (0 != func (path, &len))
{
GNUNET_free (path);
return NULL;
}
len = strlen (path);
while ((path[len] != '/') && (len > 0))
len--;
path[len] = '\0';
return path;
}
/**
* Try to obtain the path of our executable using '_dyld_image' API.
*
* @return NULL on error
*/
static char *
get_path_from_dyld_image (void)
{
const char *path;
char *p;
char *s;
unsigned int i;
int c;
c = _dyld_image_count ();
for (i = 0; i < c; i++)
{
if (((const void *) _dyld_get_image_header (i)) !=
((const void *) &_mh_dylib_header))
continue;
path = _dyld_get_image_name (i);
if ((NULL == path) || (0 == strlen (path)))
continue;
p = GNUNET_strdup (path);
s = p + strlen (p);
while ((s > p) && ('/' != *s))
s--;
s++;
*s = '\0';
return p;
}
return NULL;
}
#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;
if (NULL == (p = getenv ("PATH")))
return NULL;
path = GNUNET_strdup (p); /* because we write on it */
buf = GNUNET_malloc (strlen (path) + strlen (binary) + 1 + 1);
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_YES == GNUNET_DISK_file_test (buf))
{
pos = GNUNET_strdup (pos);
GNUNET_free (buf);
GNUNET_free (path);
return pos;
}
GNUNET_free (buf);
GNUNET_free (path);
return NULL;
}
/**
* Try to obtain the installation path using the "GNUNET_PREFIX" environment
* variable.
*
* @return NULL on error (environment variable not set)
*/
static char *
get_path_from_GNUNET_PREFIX (void)
{
const char *p;
if ((NULL != current_pd->env_varname) &&
(NULL != (p = getenv (current_pd->env_varname))))
return GNUNET_strdup (p);
if ((NULL != current_pd->env_varname_alt) &&
(NULL != (p = getenv (current_pd->env_varname_alt))))
return GNUNET_strdup (p);
return NULL;
}
/**
* @brief get the path to GNUnet bin/ or lib/, preferring the lib/ path
* @author Milan
*
* @return a pointer to the executable path, or NULL on error
*/
static char *
os_get_gnunet_path (void)
{
char *ret;
if (NULL != (ret = get_path_from_GNUNET_PREFIX ()))
return ret;
#ifdef __linux__
if (NULL != (ret = get_path_from_proc_maps ()))
return ret;
/* try path *first*, before /proc/exe, as /proc/exe can be wrong */
if ((NULL != current_pd->binary_name) &&
(NULL != (ret = get_path_from_PATH (current_pd->binary_name))))
return ret;
if (NULL != (ret = get_path_from_proc_exe ()))
return ret;
#endif
#if DARWIN
if (NULL != (ret = get_path_from_dyld_image ()))
return ret;
if (NULL != (ret = get_path_from_NSGetExecutablePath ()))
return ret;
#endif
if ((NULL != current_pd->binary_name) &&
(NULL != (ret = get_path_from_PATH (current_pd->binary_name))))
return ret;
/* other attempts here */
LOG (GNUNET_ERROR_TYPE_ERROR,
_ (
"Could not determine installation path for %s. Set `%s' environment variable.\n"),
current_pd->project_dirname,
current_pd->env_varname);
return NULL;
}
/**
* @brief get the path to current app's bin/
* @return a pointer to the executable path, or NULL on error
*/
static char *
os_get_exec_path ()
{
char *ret = NULL;
#ifdef __linux__
if (NULL != (ret = get_path_from_proc_exe ()))
return ret;
#endif
#if DARWIN
if (NULL != (ret = get_path_from_NSGetExecutablePath ()))
return ret;
#endif
/* other attempts here */
return ret;
}
/**
* @brief get the path to a specific GNUnet installation directory or,
* with #GNUNET_OS_IPK_SELF_PREFIX, the current running apps installation directory
* @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;
char *dirname;
char *execpath = NULL;
char *tmp;
char *multiarch;
char *libdir;
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 (NULL == execpath)
execpath = os_get_gnunet_path ();
if (NULL == execpath)
return NULL;
n = strlen (execpath);
if (0 == n)
{
/* should never happen, but better safe than sorry */
GNUNET_free (execpath);
return NULL;
}
/* remove filename itself */
while ((n > 1) && (DIR_SEPARATOR == execpath[n - 1]))
execpath[--n] = '\0';
isbasedir = 1;
if ((n > 6) && ((0 == strcasecmp (&execpath[n - 6], "/lib32")) ||
(0 == strcasecmp (&execpath[n - 6], "/lib64"))))
{
if ((GNUNET_OS_IPK_LIBDIR != dirkind) &&
(GNUNET_OS_IPK_LIBEXECDIR != dirkind))
{
/* strip '/lib32' or '/lib64' */
execpath[n - 6] = '\0';
n -= 6;
}
else
isbasedir = 0;
}
else if ((n > 4) && ((0 == strcasecmp (&execpath[n - 4], "/bin")) ||
(0 == strcasecmp (&execpath[n - 4], "/lib"))))
{
/* strip '/bin' or '/lib' */
execpath[n - 4] = '\0';
n -= 4;
}
multiarch = NULL;
if (NULL != (libdir = strstr (execpath, "/lib/")))
{
/* test for multi-arch path of the form "PREFIX/lib/MULTIARCH/";
here we need to re-add 'multiarch' to lib and libexec paths later! */
multiarch = &libdir[5];
if (NULL == strchr (multiarch, '/'))
libdir[0] =
'\0'; /* Debian multiarch format, cut of from 'execpath' but preserve in multicarch */
else
multiarch =
NULL; /* maybe not, multiarch still has a '/', which is not OK */
}
/* 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 = GNUNET_strdup (DIR_SEPARATOR_STR);
break;
case GNUNET_OS_IPK_BINDIR:
dirname = GNUNET_strdup (DIR_SEPARATOR_STR "bin" DIR_SEPARATOR_STR);
break;
case GNUNET_OS_IPK_LIBDIR:
if (isbasedir)
{
GNUNET_asprintf (&tmp,
"%s%s%s%s%s%s%s",
execpath,
DIR_SEPARATOR_STR "lib",
(NULL != multiarch) ? DIR_SEPARATOR_STR : "",
(NULL != multiarch) ? multiarch : "",
DIR_SEPARATOR_STR,
current_pd->project_dirname,
DIR_SEPARATOR_STR);
if (GNUNET_YES == GNUNET_DISK_directory_test (tmp, GNUNET_YES))
{
GNUNET_free (execpath);
return tmp;
}
GNUNET_free (tmp);
tmp = NULL;
dirname = NULL;
if (4 == sizeof(void *))
{
GNUNET_asprintf (&dirname,
DIR_SEPARATOR_STR "lib32" DIR_SEPARATOR_STR
"%s" DIR_SEPARATOR_STR,
current_pd->project_dirname);
GNUNET_asprintf (&tmp, "%s%s", execpath, dirname);
}
if (8 == sizeof(void *))
{
GNUNET_asprintf (&dirname,
DIR_SEPARATOR_STR "lib64" DIR_SEPARATOR_STR
"%s" DIR_SEPARATOR_STR,
current_pd->project_dirname);
GNUNET_asprintf (&tmp, "%s%s", execpath, dirname);
}
if ((NULL != tmp) &&
(GNUNET_YES == GNUNET_DISK_directory_test (tmp, GNUNET_YES)))
{
GNUNET_free (execpath);
GNUNET_free (dirname);
return tmp;
}
GNUNET_free (tmp);
GNUNET_free (dirname);
}
GNUNET_asprintf (&dirname,
DIR_SEPARATOR_STR "%s" DIR_SEPARATOR_STR,
current_pd->project_dirname);
break;
case GNUNET_OS_IPK_DATADIR:
GNUNET_asprintf (&dirname,
DIR_SEPARATOR_STR "share" DIR_SEPARATOR_STR
"%s" DIR_SEPARATOR_STR,
current_pd->project_dirname);
break;
case GNUNET_OS_IPK_LOCALEDIR:
dirname = GNUNET_strdup (DIR_SEPARATOR_STR "share" DIR_SEPARATOR_STR
"locale" DIR_SEPARATOR_STR);
break;
case GNUNET_OS_IPK_ICONDIR:
dirname = GNUNET_strdup (DIR_SEPARATOR_STR "share" DIR_SEPARATOR_STR
"icons" DIR_SEPARATOR_STR);
break;
case GNUNET_OS_IPK_DOCDIR:
GNUNET_asprintf (&dirname,
DIR_SEPARATOR_STR "share" DIR_SEPARATOR_STR
"doc" DIR_SEPARATOR_STR
"%s" DIR_SEPARATOR_STR,
current_pd->project_dirname);
break;
case GNUNET_OS_IPK_LIBEXECDIR:
if (isbasedir)
{
GNUNET_asprintf (&dirname,
DIR_SEPARATOR_STR "%s" DIR_SEPARATOR_STR
"libexec" DIR_SEPARATOR_STR,
current_pd->project_dirname);
GNUNET_asprintf (&tmp,
"%s%s%s%s",
execpath,
DIR_SEPARATOR_STR "lib" DIR_SEPARATOR_STR,
(NULL != multiarch) ? multiarch : "",
dirname);
GNUNET_free (dirname);
if (GNUNET_YES == GNUNET_DISK_directory_test (tmp, GNUNET_YES))
{
GNUNET_free (execpath);
return tmp;
}
GNUNET_free (tmp);
tmp = NULL;
dirname = NULL;
if (4 == sizeof(void *))
{
GNUNET_asprintf (&dirname,
DIR_SEPARATOR_STR "lib32" DIR_SEPARATOR_STR
"%s" DIR_SEPARATOR_STR
"libexec" DIR_SEPARATOR_STR,
current_pd->project_dirname);
GNUNET_asprintf (&tmp, "%s%s", execpath, dirname);
}
if (8 == sizeof(void *))
{
GNUNET_asprintf (&dirname,
DIR_SEPARATOR_STR "lib64" DIR_SEPARATOR_STR
"%s" DIR_SEPARATOR_STR
"libexec" DIR_SEPARATOR_STR,
current_pd->project_dirname);
GNUNET_asprintf (&tmp, "%s%s", execpath, dirname);
}
if ((NULL != tmp) &&
(GNUNET_YES == GNUNET_DISK_directory_test (tmp, GNUNET_YES)))
{
GNUNET_free (execpath);
GNUNET_free (dirname);
return tmp;
}
GNUNET_free (tmp);
GNUNET_free (dirname);
}
GNUNET_asprintf (&dirname,
DIR_SEPARATOR_STR "%s" DIR_SEPARATOR_STR
"libexec" DIR_SEPARATOR_STR,
current_pd->project_dirname);
break;
default:
GNUNET_free (execpath);
return NULL;
}
GNUNET_asprintf (&tmp, "%s%s", execpath, dirname);
GNUNET_free (dirname);
GNUNET_free (execpath);
return tmp;
}
/**
* Given the name of a gnunet-helper, gnunet-service or gnunet-daemon
* binary, try to prefix it with the libexec/-directory to get the
* full path.
*
* @param progname name of the binary
* @return full path to the binary, if possible, otherwise copy of 'progname'
*/
char *
GNUNET_OS_get_libexec_binary_path (const char *progname)
{
static char *cache;
char *libexecdir;
char *binary;
if ((DIR_SEPARATOR == progname[0]) ||
(GNUNET_YES ==
GNUNET_STRINGS_path_is_absolute (progname, GNUNET_NO, NULL, NULL)))
return GNUNET_strdup (progname);
if (NULL != cache)
libexecdir = cache;
else
libexecdir = GNUNET_OS_installation_get_path (GNUNET_OS_IPK_LIBEXECDIR);
if (NULL == libexecdir)
return GNUNET_strdup (progname);
GNUNET_asprintf (&binary, "%s%s", libexecdir, progname);
cache = libexecdir;
return binary;
}
/**
* Given the name of a helper, service or daemon binary construct the full
* path to the binary using the SUID_BINARY_PATH in the PATHS section of the
* configuration. If that option is not present, fall back to
* GNUNET_OS_get_libexec_binary_path. If @a progname is an absolute path, a
* copy of this path is returned.
*
* @param cfg configuration to inspect
* @param progname name of the binary
* @return full path to the binary, if possible, a copy of @a progname
* otherwise
*/
char *
GNUNET_OS_get_suid_binary_path (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *progname)
{
static char *cache;
char *binary = NULL;
char *path = NULL;
size_t path_len;
if (GNUNET_YES ==
GNUNET_STRINGS_path_is_absolute (progname, GNUNET_NO, NULL, NULL))
{
return GNUNET_strdup (progname);
}
if (NULL != cache)
path = cache;
else
GNUNET_CONFIGURATION_get_value_string (cfg,
"PATHS",
"SUID_BINARY_PATH",
&path);
if ((NULL == path) || (0 == strlen (path)))
{
if (NULL != path)
GNUNET_free (path);
cache = NULL;
return GNUNET_OS_get_libexec_binary_path (progname);
}
path_len = strlen (path);
GNUNET_asprintf (&binary,
"%s%s%s",
path,
(path[path_len - 1] == DIR_SEPARATOR) ? ""
: DIR_SEPARATOR_STR,
progname);
cache = path;
return binary;
}
/**
* 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.
* W32: must not have an .exe suffix.
* @param check_suid input true if the binary should be checked for SUID (*nix)
* W32: checks if the program has sufficient privileges by executing this
* binary with the -d flag. -d omits a programs main loop and only
* executes all privileged operations in an binary.
* @param params parameters used for w32 privilege checking (can be NULL for != w32 )
* @return #GNUNET_YES if the file is SUID (*nix) or can be executed with current privileges (W32),
* #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,
int check_suid,
const char *params)
{
struct stat statbuf;
char *p;
char *pf;
if ((GNUNET_YES ==
GNUNET_STRINGS_path_is_absolute (binary, GNUNET_NO, NULL, NULL)) ||
(0 == strncmp (binary, "./", 2)))
{
p = GNUNET_strdup (binary);
}
else
{
p = get_path_from_PATH (binary);
if (NULL != p)
{
GNUNET_asprintf (&pf, "%s/%s", p, binary);
GNUNET_free (p);
p = pf;
}
}
if (NULL == p)
{
LOG (GNUNET_ERROR_TYPE_INFO,
_ ("Could not find binary `%s' in PATH!\n"),
binary);
return GNUNET_SYSERR;
}
if (0 != access (p, X_OK))
{
LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_WARNING, "access", p);
GNUNET_free (p);
return GNUNET_SYSERR;
}
if (0 == getuid ())
{
/* as we run as root, we don't insist on SUID */
GNUNET_free (p);
return GNUNET_YES;
}
if (0 != stat (p, &statbuf))
{
LOG_STRERROR_FILE (GNUNET_ERROR_TYPE_WARNING, "stat", p);
GNUNET_free (p);
return GNUNET_SYSERR;
}
if (check_suid)
{
(void) params;
if ((0 != (statbuf.st_mode & S_ISUID)) && (0 == statbuf.st_uid))
{
GNUNET_free (p);
return GNUNET_YES;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
_ ("Binary `%s' exists, but is not SUID\n"),
p);
/* binary exists, but not SUID */
}
GNUNET_free (p);
return GNUNET_NO;
}
/* end of os_installation.c */
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