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Diffstat (limited to 'src/util/os_installation.c')
| -rw-r--r-- | src/util/os_installation.c | 701 |
1 files changed, 701 insertions, 0 deletions
diff --git a/src/util/os_installation.c b/src/util/os_installation.c new file mode 100644 index 000000000..82dc49180 --- /dev/null +++ b/src/util/os_installation.c @@ -0,0 +1,701 @@ +/* + This file is part of GNUnet. + Copyright (C) 2006-2014 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 3, 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 os_installation.c + * @brief get paths used by the program; based heavily on the + * corresponding GNUnet file, just adapted for Taler. + * @author Milan + */ +#include "platform.h" +#include <gnunet/gnunet_util_lib.h> +#if DARWIN +#include <mach-o/ldsyms.h> +#include <mach-o/dyld.h> +#elif WINDOWS +#include <windows.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 + * + * @return NULL on error + */ +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 ()); + if (NULL == (f = FOPEN (fn, "r"))) + return NULL; + while (NULL != fgets (line, sizeof (line), f)) + { + if ((1 == + SSCANF (line, "%*x-%*x %*c%*c%*c%*c %*x %*2x:%*2x %*u%*[ ]%1023s", dir)) && + (NULL != (lgu = strstr (dir, "libtalerutil")))) + { + 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 () +{ + 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--; + /* test for being in lib/taler/libexec/ or lib/MULTIARCH/taler/libexec */ + if ( (size > strlen ("/taler/libexec/")) && + (0 == strcmp ("/taler/libexec/", + &lnk[size - strlen ("/taler/libexec/")])) ) + size -= strlen ("taler/libexec/"); + 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 +static HINSTANCE dll_instance; + + +/** + * GNUNET_util_cl_init() in common_logging.c is preferred. + * This function is only for thread-local storage (not used in GNUnet) + * and hInstance saving. + */ +BOOL WINAPI +DllMain (HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) +{ + switch (fdwReason) + { + case DLL_PROCESS_ATTACH: + dll_instance = hinstDLL; + break; + case DLL_THREAD_ATTACH: + break; + case DLL_THREAD_DETACH: + break; + case DLL_PROCESS_DETACH: + break; + } + return TRUE; +} + + +/** + * Try to determine path with win32-specific function + * + * @return NULL on error + */ +static char * +get_path_from_module_filename () +{ + size_t pathlen = 512; + DWORD real_pathlen; + wchar_t *idx; + wchar_t *modulepath = NULL; + char *upath; + uint8_t *u8_string; + size_t u8_string_length; + + /* This braindead function won't tell us how much space it needs, so + * we start at 1024 and double the space up if it doesn't fit, until + * it fits, or we exceed the threshold. + */ + do + { + pathlen = pathlen * 2; + modulepath = GNUNET_realloc (modulepath, pathlen * sizeof (wchar_t)); + SetLastError (0); + real_pathlen = GetModuleFileNameW (dll_instance, modulepath, pathlen * sizeof (wchar_t)); + } while (real_pathlen >= pathlen && pathlen < 16*1024); + if (real_pathlen >= pathlen) + GNUNET_assert (0); + /* To be safe */ + modulepath[real_pathlen] = '\0'; + + idx = modulepath + real_pathlen; + while ((idx > modulepath) && (*idx != L'\\') && (*idx != L'/')) + idx--; + *idx = L'\0'; + + /* Now modulepath holds full path to the directory where libtalerutil is. + * This directory should look like <TALER_PREFIX>/bin or <TALER_PREFIX>. + */ + if (wcschr (modulepath, L'/') || wcschr (modulepath, L'\\')) + { + /* At least one directory component (i.e. we're not in a root directory) */ + wchar_t *dirname = idx; + while ((dirname > modulepath) && (*dirname != L'\\') && (*dirname != L'/')) + dirname--; + *dirname = L'\0'; + if (dirname > modulepath) + { + dirname++; + /* Now modulepath holds full path to the parent directory of the directory + * where libtalerutil is. + * dirname holds the name of the directory where libtalerutil is. + */ + if (wcsicmp (dirname, L"bin") == 0) + { + /* pass */ + } + else + { + /* Roll back our changes to modulepath */ + dirname--; + *dirname = L'/'; + } + } + } + + /* modulepath is TALER_PREFIX */ + u8_string = u16_to_u8 (modulepath, wcslen (modulepath), NULL, &u8_string_length); + if (NULL == u8_string) + GNUNET_assert (0); + + upath = GNUNET_malloc (u8_string_length + 1); + memcpy (upath, u8_string, u8_string_length); + upath[u8_string_length] = '\0'; + + free (u8_string); + GNUNET_free (modulepath); + + return upath; +} +#endif + + +#if DARWIN +/** + * Signature of the '_NSGetExecutablePath" function. + * + * @param buf where to write the path + * @param number of bytes available in '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 () +{ + 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 () +{ + 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; +#if WINDOWS + /* On W32 look in CWD first. */ + GNUNET_asprintf (&path, ".%c%s", PATH_SEPARATOR, p); +#else + path = GNUNET_strdup (p); /* because we write on it */ +#endif + 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 "TALER_PREFIX" environment + * variable. + * + * @return NULL on error (environment variable not set) + */ +static char * +get_path_from_TALER_PREFIX () +{ + const char *p; + + if (NULL != (p = getenv ("TALER_PREFIX"))) + return GNUNET_strdup (p); + return NULL; +} + + +/** + * @brief get the path to Taler bin/ or lib/, prefering the lib/ path + * @author Milan + * + * @return a pointer to the executable path, or NULL on error + */ +static char * +os_get_taler_path () +{ + char *ret; + + if (NULL != (ret = get_path_from_TALER_PREFIX ())) + return ret; +#if 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 != (ret = get_path_from_PATH ("taler-mint-httpd"))) + return ret; + if (NULL != (ret = get_path_from_proc_exe ())) + return ret; +#endif +#if WINDOWS + if (NULL != (ret = get_path_from_module_filename ())) + 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 != (ret = get_path_from_PATH ("taler-mint-httpd"))) + return ret; + /* other attempts here */ + LOG (GNUNET_ERROR_TYPE_ERROR, + _("Could not determine installation path for %s. Set `%s' environment variable.\n"), + "Taler", "TALER_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 = NULL; + +#if LINUX + if (NULL != (ret = get_path_from_proc_exe ())) + return ret; +#endif +#if WINDOWS + if (NULL != (ret = get_path_from_module_filename ())) + 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 Taler installation directory or, + * with #TALER_OS_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 * +TALER_OS_installation_get_path (enum GNUNET_OS_InstallationPathKind dirkind) +{ + size_t n; + const 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 Taler's bin/ or lib/, or if previous was unsuccessful some + * guess for the current app */ + if (NULL == execpath) + execpath = os_get_taler_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 = 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) + { + GNUNET_asprintf (&tmp, + "%s%s%s%s%s", + execpath, + DIR_SEPARATOR_STR "lib", + (NULL != multiarch) ? DIR_SEPARATOR_STR : "", + (NULL != multiarch) ? multiarch : "", + DIR_SEPARATOR_STR "taler" DIR_SEPARATOR_STR); + if (GNUNET_YES == + GNUNET_DISK_directory_test (tmp, GNUNET_YES)) + { + GNUNET_free (execpath); + return tmp; + } + GNUNET_free (tmp); + tmp = NULL; + if (4 == sizeof (void *)) + { + dirname = + DIR_SEPARATOR_STR "lib32" DIR_SEPARATOR_STR "taler" DIR_SEPARATOR_STR; + GNUNET_asprintf (&tmp, + "%s%s", + execpath, + dirname); + } + if (8 == sizeof (void *)) + { + dirname = + DIR_SEPARATOR_STR "lib64" DIR_SEPARATOR_STR "taler" DIR_SEPARATOR_STR; + GNUNET_asprintf (&tmp, + "%s%s", + execpath, + dirname); + } + + if ( (NULL != tmp) && + (GNUNET_YES == + GNUNET_DISK_directory_test (tmp, GNUNET_YES)) ) + { + GNUNET_free (execpath); + return tmp; + } + GNUNET_free (tmp); + } + dirname = DIR_SEPARATOR_STR "taler" DIR_SEPARATOR_STR; + break; + case GNUNET_OS_IPK_DATADIR: + dirname = + DIR_SEPARATOR_STR "share" DIR_SEPARATOR_STR "taler" 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; + case GNUNET_OS_IPK_LIBEXECDIR: + if (isbasedir) + { + dirname = + DIR_SEPARATOR_STR "taler" DIR_SEPARATOR_STR "libexec" DIR_SEPARATOR_STR; + GNUNET_asprintf (&tmp, + "%s%s%s%s", + execpath, + DIR_SEPARATOR_STR "lib" DIR_SEPARATOR_STR, + (NULL != multiarch) ? multiarch : "", + dirname); + if (GNUNET_YES == + GNUNET_DISK_directory_test (tmp, GNUNET_YES)) + { + GNUNET_free (execpath); + return tmp; + } + GNUNET_free (tmp); + tmp = NULL; + if (4 == sizeof (void *)) + { + dirname = + DIR_SEPARATOR_STR "lib32" DIR_SEPARATOR_STR "taler" DIR_SEPARATOR_STR \ + "libexec" DIR_SEPARATOR_STR; + GNUNET_asprintf (&tmp, + "%s%s", + execpath, + dirname); + } + if (8 == sizeof (void *)) + { + dirname = + DIR_SEPARATOR_STR "lib64" DIR_SEPARATOR_STR "taler" DIR_SEPARATOR_STR \ + "libexec" DIR_SEPARATOR_STR; + GNUNET_asprintf (&tmp, + "%s%s", + execpath, + dirname); + } + if ( (NULL != tmp) && + (GNUNET_YES == + GNUNET_DISK_directory_test (tmp, GNUNET_YES)) ) + { + GNUNET_free (execpath); + return tmp; + } + + GNUNET_free (tmp); + } + dirname = + DIR_SEPARATOR_STR "taler" DIR_SEPARATOR_STR \ + "libexec" DIR_SEPARATOR_STR; + break; + default: + GNUNET_free (execpath); + return NULL; + } + GNUNET_asprintf (&tmp, + "%s%s", + execpath, + dirname); + GNUNET_free (execpath); + return tmp; +} + + +/** + * Given the name of a taler-helper, taler-service or taler-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 * +TALER_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; +} + + + +/* end of os_installation.c */ |