/* 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 #include #include #include #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 #include #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 */