| /* |
| * Copyright (C) 2011-2012 Vinay Sajip. |
| * Licensed to PSF under a contributor agreement. |
| * |
| * Based on the work of: |
| * |
| * Mark Hammond (original author of Python version) |
| * Curt Hagenlocher (job management) |
| */ |
| |
| #include <windows.h> |
| #include <shlobj.h> |
| #include <stdio.h> |
| #include <tchar.h> |
| |
| #define BUFSIZE 256 |
| #define MSGSIZE 1024 |
| |
| /* Build options. */ |
| #define SKIP_PREFIX |
| /* #define SEARCH_PATH */ |
| |
| /* Just for now - static definition */ |
| |
| static FILE * log_fp = NULL; |
| |
| static wchar_t * |
| skip_whitespace(wchar_t * p) |
| { |
| while (*p && isspace(*p)) |
| ++p; |
| return p; |
| } |
| |
| /* |
| * This function is here to simplify memory management |
| * and to treat blank values as if they are absent. |
| */ |
| static wchar_t * get_env(wchar_t * key) |
| { |
| /* This is not thread-safe, just like getenv */ |
| static wchar_t buf[256]; |
| DWORD result = GetEnvironmentVariableW(key, buf, 256); |
| |
| if (result > 255) { |
| /* Large environment variable. Accept some leakage */ |
| wchar_t *buf2 = (wchar_t*)malloc(sizeof(wchar_t) * (result+1)); |
| GetEnvironmentVariableW(key, buf2, result); |
| return buf2; |
| } |
| |
| if (result == 0) |
| /* Either some error, e.g. ERROR_ENVVAR_NOT_FOUND, |
| or an empty environment variable. */ |
| return NULL; |
| |
| return buf; |
| } |
| |
| |
| static void |
| debug(wchar_t * format, ...) |
| { |
| va_list va; |
| |
| if (log_fp != NULL) { |
| va_start(va, format); |
| vfwprintf_s(log_fp, format, va); |
| } |
| } |
| |
| static void |
| winerror(int rc, wchar_t * message, int size) |
| { |
| FormatMessageW( |
| FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, |
| NULL, rc, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), |
| message, size, NULL); |
| } |
| |
| static void |
| error(int rc, wchar_t * format, ... ) |
| { |
| va_list va; |
| wchar_t message[MSGSIZE]; |
| wchar_t win_message[MSGSIZE]; |
| int len; |
| |
| va_start(va, format); |
| len = _vsnwprintf_s(message, MSGSIZE, _TRUNCATE, format, va); |
| |
| if (rc == 0) { /* a Windows error */ |
| winerror(GetLastError(), win_message, MSGSIZE); |
| if (len >= 0) { |
| _snwprintf_s(&message[len], MSGSIZE - len, _TRUNCATE, L": %s", |
| win_message); |
| } |
| } |
| |
| #if !defined(_WINDOWS) |
| fwprintf(stderr, L"%s\n", message); |
| #else |
| MessageBox(NULL, message, TEXT("Python Launcher is sorry to say ..."), MB_OK); |
| #endif |
| ExitProcess(rc); |
| } |
| |
| #if defined(_WINDOWS) |
| |
| #define PYTHON_EXECUTABLE L"pythonw.exe" |
| |
| #else |
| |
| #define PYTHON_EXECUTABLE L"python.exe" |
| |
| #endif |
| |
| #define RC_NO_STD_HANDLES 100 |
| #define RC_CREATE_PROCESS 101 |
| #define RC_BAD_VIRTUAL_PATH 102 |
| #define RC_NO_PYTHON 103 |
| |
| #define MAX_VERSION_SIZE 4 |
| |
| typedef struct { |
| wchar_t version[MAX_VERSION_SIZE]; /* m.n */ |
| int bits; /* 32 or 64 */ |
| wchar_t executable[MAX_PATH]; |
| } INSTALLED_PYTHON; |
| |
| /* |
| * To avoid messing about with heap allocations, just assume we can allocate |
| * statically and never have to deal with more versions than this. |
| */ |
| #define MAX_INSTALLED_PYTHONS 100 |
| |
| static INSTALLED_PYTHON installed_pythons[MAX_INSTALLED_PYTHONS]; |
| |
| static size_t num_installed_pythons = 0; |
| |
| /* to hold SOFTWARE\Python\PythonCore\X.Y\InstallPath */ |
| #define IP_BASE_SIZE 40 |
| #define IP_SIZE (IP_BASE_SIZE + MAX_VERSION_SIZE) |
| #define CORE_PATH L"SOFTWARE\\Python\\PythonCore" |
| |
| static wchar_t * location_checks[] = { |
| L"\\", |
| L"\\PCBuild\\", |
| L"\\PCBuild\\amd64\\", |
| NULL |
| }; |
| |
| static INSTALLED_PYTHON * |
| find_existing_python(wchar_t * path) |
| { |
| INSTALLED_PYTHON * result = NULL; |
| size_t i; |
| INSTALLED_PYTHON * ip; |
| |
| for (i = 0, ip = installed_pythons; i < num_installed_pythons; i++, ip++) { |
| if (_wcsicmp(path, ip->executable) == 0) { |
| result = ip; |
| break; |
| } |
| } |
| return result; |
| } |
| |
| static void |
| locate_pythons_for_key(HKEY root, REGSAM flags) |
| { |
| HKEY core_root, ip_key; |
| LSTATUS status = RegOpenKeyExW(root, CORE_PATH, 0, flags, &core_root); |
| wchar_t message[MSGSIZE]; |
| DWORD i; |
| size_t n; |
| BOOL ok; |
| DWORD type, data_size, attrs; |
| INSTALLED_PYTHON * ip, * pip; |
| wchar_t ip_path[IP_SIZE]; |
| wchar_t * check; |
| wchar_t ** checkp; |
| wchar_t *key_name = (root == HKEY_LOCAL_MACHINE) ? L"HKLM" : L"HKCU"; |
| |
| if (status != ERROR_SUCCESS) |
| debug(L"locate_pythons_for_key: unable to open PythonCore key in %s\n", |
| key_name); |
| else { |
| ip = &installed_pythons[num_installed_pythons]; |
| for (i = 0; num_installed_pythons < MAX_INSTALLED_PYTHONS; i++) { |
| status = RegEnumKeyW(core_root, i, ip->version, MAX_VERSION_SIZE); |
| if (status != ERROR_SUCCESS) { |
| if (status != ERROR_NO_MORE_ITEMS) { |
| /* unexpected error */ |
| winerror(status, message, MSGSIZE); |
| debug(L"Can't enumerate registry key for version %s: %s\n", |
| ip->version, message); |
| } |
| break; |
| } |
| else { |
| _snwprintf_s(ip_path, IP_SIZE, _TRUNCATE, |
| L"%s\\%s\\InstallPath", CORE_PATH, ip->version); |
| status = RegOpenKeyExW(root, ip_path, 0, flags, &ip_key); |
| if (status != ERROR_SUCCESS) { |
| winerror(status, message, MSGSIZE); |
| // Note: 'message' already has a trailing \n |
| debug(L"%s\\%s: %s", key_name, ip_path, message); |
| continue; |
| } |
| data_size = sizeof(ip->executable) - 1; |
| status = RegQueryValueExW(ip_key, NULL, NULL, &type, |
| (LPBYTE)ip->executable, &data_size); |
| RegCloseKey(ip_key); |
| if (status != ERROR_SUCCESS) { |
| winerror(status, message, MSGSIZE); |
| debug(L"%s\\%s: %s\n", key_name, ip_path, message); |
| continue; |
| } |
| if (type == REG_SZ) { |
| data_size = data_size / sizeof(wchar_t) - 1; /* for NUL */ |
| if (ip->executable[data_size - 1] == L'\\') |
| --data_size; /* reg value ended in a backslash */ |
| /* ip->executable is data_size long */ |
| for (checkp = location_checks; *checkp; ++checkp) { |
| check = *checkp; |
| _snwprintf_s(&ip->executable[data_size], |
| MAX_PATH - data_size, |
| MAX_PATH - data_size, |
| L"%s%s", check, PYTHON_EXECUTABLE); |
| attrs = GetFileAttributesW(ip->executable); |
| if (attrs == INVALID_FILE_ATTRIBUTES) { |
| winerror(GetLastError(), message, MSGSIZE); |
| debug(L"locate_pythons_for_key: %s: %s", |
| ip->executable, message); |
| } |
| else if (attrs & FILE_ATTRIBUTE_DIRECTORY) { |
| debug(L"locate_pythons_for_key: '%s' is a \ |
| directory\n", |
| ip->executable, attrs); |
| } |
| else if (find_existing_python(ip->executable)) { |
| debug(L"locate_pythons_for_key: %s: already \ |
| found: %s\n", ip->executable); |
| } |
| else { |
| /* check the executable type. */ |
| ok = GetBinaryTypeW(ip->executable, &attrs); |
| if (!ok) { |
| debug(L"Failure getting binary type: %s\n", |
| ip->executable); |
| } |
| else { |
| if (attrs == SCS_64BIT_BINARY) |
| ip->bits = 64; |
| else if (attrs == SCS_32BIT_BINARY) |
| ip->bits = 32; |
| else |
| ip->bits = 0; |
| if (ip->bits == 0) { |
| debug(L"locate_pythons_for_key: %s: \ |
| invalid binary type: %X\n", |
| ip->executable, attrs); |
| } |
| else { |
| if (wcschr(ip->executable, L' ') != NULL) { |
| /* has spaces, so quote */ |
| n = wcslen(ip->executable); |
| memmove(&ip->executable[1], |
| ip->executable, n * sizeof(wchar_t)); |
| ip->executable[0] = L'\"'; |
| ip->executable[n + 1] = L'\"'; |
| ip->executable[n + 2] = L'\0'; |
| } |
| debug(L"locate_pythons_for_key: %s \ |
| is a %dbit executable\n", |
| ip->executable, ip->bits); |
| ++num_installed_pythons; |
| pip = ip++; |
| if (num_installed_pythons >= |
| MAX_INSTALLED_PYTHONS) |
| break; |
| /* Copy over the attributes for the next */ |
| *ip = *pip; |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| RegCloseKey(core_root); |
| } |
| } |
| |
| static int |
| compare_pythons(const void * p1, const void * p2) |
| { |
| INSTALLED_PYTHON * ip1 = (INSTALLED_PYTHON *) p1; |
| INSTALLED_PYTHON * ip2 = (INSTALLED_PYTHON *) p2; |
| /* note reverse sorting on version */ |
| int result = wcscmp(ip2->version, ip1->version); |
| |
| if (result == 0) |
| result = ip2->bits - ip1->bits; /* 64 before 32 */ |
| return result; |
| } |
| |
| static void |
| locate_all_pythons() |
| { |
| #if defined(_M_X64) |
| // If we are a 64bit process, first hit the 32bit keys. |
| debug(L"locating Pythons in 32bit registry\n"); |
| locate_pythons_for_key(HKEY_CURRENT_USER, KEY_READ | KEY_WOW64_32KEY); |
| locate_pythons_for_key(HKEY_LOCAL_MACHINE, KEY_READ | KEY_WOW64_32KEY); |
| #else |
| // If we are a 32bit process on a 64bit Windows, first hit the 64bit keys. |
| BOOL f64 = FALSE; |
| if (IsWow64Process(GetCurrentProcess(), &f64) && f64) { |
| debug(L"locating Pythons in 64bit registry\n"); |
| locate_pythons_for_key(HKEY_CURRENT_USER, KEY_READ | KEY_WOW64_64KEY); |
| locate_pythons_for_key(HKEY_LOCAL_MACHINE, KEY_READ | KEY_WOW64_64KEY); |
| } |
| #endif |
| // now hit the "native" key for this process bittedness. |
| debug(L"locating Pythons in native registry\n"); |
| locate_pythons_for_key(HKEY_CURRENT_USER, KEY_READ); |
| locate_pythons_for_key(HKEY_LOCAL_MACHINE, KEY_READ); |
| qsort(installed_pythons, num_installed_pythons, sizeof(INSTALLED_PYTHON), |
| compare_pythons); |
| } |
| |
| static INSTALLED_PYTHON * |
| find_python_by_version(wchar_t const * wanted_ver) |
| { |
| INSTALLED_PYTHON * result = NULL; |
| INSTALLED_PYTHON * ip = installed_pythons; |
| size_t i, n; |
| size_t wlen = wcslen(wanted_ver); |
| int bits = 0; |
| |
| if (wcsstr(wanted_ver, L"-32")) |
| bits = 32; |
| for (i = 0; i < num_installed_pythons; i++, ip++) { |
| n = wcslen(ip->version); |
| if (n > wlen) |
| n = wlen; |
| if ((wcsncmp(ip->version, wanted_ver, n) == 0) && |
| /* bits == 0 => don't care */ |
| ((bits == 0) || (ip->bits == bits))) { |
| result = ip; |
| break; |
| } |
| } |
| return result; |
| } |
| |
| |
| static wchar_t appdata_ini_path[MAX_PATH]; |
| static wchar_t launcher_ini_path[MAX_PATH]; |
| |
| /* |
| * Get a value either from the environment or a configuration file. |
| * The key passed in will either be "python", "python2" or "python3". |
| */ |
| static wchar_t * |
| get_configured_value(wchar_t * key) |
| { |
| /* |
| * Note: this static value is used to return a configured value |
| * obtained either from the environment or configuration file. |
| * This should be OK since there wouldn't be any concurrent calls. |
| */ |
| static wchar_t configured_value[MSGSIZE]; |
| wchar_t * result = NULL; |
| wchar_t * found_in = L"environment"; |
| DWORD size; |
| |
| /* First, search the environment. */ |
| _snwprintf_s(configured_value, MSGSIZE, _TRUNCATE, L"py_%s", key); |
| result = get_env(configured_value); |
| if (result == NULL && appdata_ini_path[0]) { |
| /* Not in environment: check local configuration. */ |
| size = GetPrivateProfileStringW(L"defaults", key, NULL, |
| configured_value, MSGSIZE, |
| appdata_ini_path); |
| if (size > 0) { |
| result = configured_value; |
| found_in = appdata_ini_path; |
| } |
| } |
| if (result == NULL && launcher_ini_path[0]) { |
| /* Not in environment or local: check global configuration. */ |
| size = GetPrivateProfileStringW(L"defaults", key, NULL, |
| configured_value, MSGSIZE, |
| launcher_ini_path); |
| if (size > 0) { |
| result = configured_value; |
| found_in = launcher_ini_path; |
| } |
| } |
| if (result) { |
| debug(L"found configured value '%s=%s' in %s\n", |
| key, result, found_in ? found_in : L"(unknown)"); |
| } else { |
| debug(L"found no configured value for '%s'\n", key); |
| } |
| return result; |
| } |
| |
| static INSTALLED_PYTHON * |
| locate_python(wchar_t * wanted_ver) |
| { |
| static wchar_t config_key [] = { L"pythonX" }; |
| static wchar_t * last_char = &config_key[sizeof(config_key) / |
| sizeof(wchar_t) - 2]; |
| INSTALLED_PYTHON * result = NULL; |
| size_t n = wcslen(wanted_ver); |
| wchar_t * configured_value; |
| |
| if (num_installed_pythons == 0) |
| locate_all_pythons(); |
| |
| if (n == 1) { /* just major version specified */ |
| *last_char = *wanted_ver; |
| configured_value = get_configured_value(config_key); |
| if (configured_value != NULL) |
| wanted_ver = configured_value; |
| } |
| if (*wanted_ver) { |
| result = find_python_by_version(wanted_ver); |
| debug(L"search for Python version '%s' found ", wanted_ver); |
| if (result) { |
| debug(L"'%s'\n", result->executable); |
| } else { |
| debug(L"no interpreter\n"); |
| } |
| } |
| else { |
| *last_char = L'\0'; /* look for an overall default */ |
| configured_value = get_configured_value(config_key); |
| if (configured_value) |
| result = find_python_by_version(configured_value); |
| if (result == NULL) |
| result = find_python_by_version(L"2"); |
| if (result == NULL) |
| result = find_python_by_version(L"3"); |
| debug(L"search for default Python found "); |
| if (result) { |
| debug(L"version %s at '%s'\n", |
| result->version, result->executable); |
| } else { |
| debug(L"no interpreter\n"); |
| } |
| } |
| return result; |
| } |
| |
| /* |
| * Process creation code |
| */ |
| |
| static BOOL |
| safe_duplicate_handle(HANDLE in, HANDLE * pout) |
| { |
| BOOL ok; |
| HANDLE process = GetCurrentProcess(); |
| DWORD rc; |
| |
| *pout = NULL; |
| ok = DuplicateHandle(process, in, process, pout, 0, TRUE, |
| DUPLICATE_SAME_ACCESS); |
| if (!ok) { |
| rc = GetLastError(); |
| if (rc == ERROR_INVALID_HANDLE) { |
| debug(L"DuplicateHandle returned ERROR_INVALID_HANDLE\n"); |
| ok = TRUE; |
| } |
| else { |
| debug(L"DuplicateHandle returned %d\n", rc); |
| } |
| } |
| return ok; |
| } |
| |
| static BOOL WINAPI |
| ctrl_c_handler(DWORD code) |
| { |
| return TRUE; /* We just ignore all control events. */ |
| } |
| |
| static void |
| run_child(wchar_t * cmdline) |
| { |
| HANDLE job; |
| JOBOBJECT_EXTENDED_LIMIT_INFORMATION info; |
| DWORD rc; |
| BOOL ok; |
| STARTUPINFOW si; |
| PROCESS_INFORMATION pi; |
| |
| debug(L"run_child: about to run '%s'\n", cmdline); |
| job = CreateJobObject(NULL, NULL); |
| ok = QueryInformationJobObject(job, JobObjectExtendedLimitInformation, |
| &info, sizeof(info), &rc); |
| if (!ok || (rc != sizeof(info)) || !job) |
| error(RC_CREATE_PROCESS, L"Job information querying failed"); |
| info.BasicLimitInformation.LimitFlags |= JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE | |
| JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK; |
| ok = SetInformationJobObject(job, JobObjectExtendedLimitInformation, &info, |
| sizeof(info)); |
| if (!ok) |
| error(RC_CREATE_PROCESS, L"Job information setting failed"); |
| memset(&si, 0, sizeof(si)); |
| si.cb = sizeof(si); |
| ok = safe_duplicate_handle(GetStdHandle(STD_INPUT_HANDLE), &si.hStdInput); |
| if (!ok) |
| error(RC_NO_STD_HANDLES, L"stdin duplication failed"); |
| ok = safe_duplicate_handle(GetStdHandle(STD_OUTPUT_HANDLE), &si.hStdOutput); |
| if (!ok) |
| error(RC_NO_STD_HANDLES, L"stdout duplication failed"); |
| ok = safe_duplicate_handle(GetStdHandle(STD_ERROR_HANDLE), &si.hStdError); |
| if (!ok) |
| error(RC_NO_STD_HANDLES, L"stderr duplication failed"); |
| |
| ok = SetConsoleCtrlHandler(ctrl_c_handler, TRUE); |
| if (!ok) |
| error(RC_CREATE_PROCESS, L"control handler setting failed"); |
| |
| si.dwFlags = STARTF_USESTDHANDLES; |
| ok = CreateProcessW(NULL, cmdline, NULL, NULL, TRUE, |
| 0, NULL, NULL, &si, &pi); |
| if (!ok) |
| error(RC_CREATE_PROCESS, L"Unable to create process using '%s'", cmdline); |
| AssignProcessToJobObject(job, pi.hProcess); |
| CloseHandle(pi.hThread); |
| WaitForSingleObject(pi.hProcess, INFINITE); |
| ok = GetExitCodeProcess(pi.hProcess, &rc); |
| if (!ok) |
| error(RC_CREATE_PROCESS, L"Failed to get exit code of process"); |
| debug(L"child process exit code: %d\n", rc); |
| ExitProcess(rc); |
| } |
| |
| static void |
| invoke_child(wchar_t * executable, wchar_t * suffix, wchar_t * cmdline) |
| { |
| wchar_t * child_command; |
| size_t child_command_size; |
| BOOL no_suffix = (suffix == NULL) || (*suffix == L'\0'); |
| BOOL no_cmdline = (*cmdline == L'\0'); |
| |
| if (no_suffix && no_cmdline) |
| run_child(executable); |
| else { |
| if (no_suffix) { |
| /* add 2 for space separator + terminating NUL. */ |
| child_command_size = wcslen(executable) + wcslen(cmdline) + 2; |
| } |
| else { |
| /* add 3 for 2 space separators + terminating NUL. */ |
| child_command_size = wcslen(executable) + wcslen(suffix) + |
| wcslen(cmdline) + 3; |
| } |
| child_command = calloc(child_command_size, sizeof(wchar_t)); |
| if (child_command == NULL) |
| error(RC_CREATE_PROCESS, L"unable to allocate %d bytes for child command.", |
| child_command_size); |
| if (no_suffix) |
| _snwprintf_s(child_command, child_command_size, |
| child_command_size - 1, L"%s %s", |
| executable, cmdline); |
| else |
| _snwprintf_s(child_command, child_command_size, |
| child_command_size - 1, L"%s %s %s", |
| executable, suffix, cmdline); |
| run_child(child_command); |
| free(child_command); |
| } |
| } |
| |
| static wchar_t * builtin_virtual_paths [] = { |
| L"/usr/bin/env python", |
| L"/usr/bin/python", |
| L"/usr/local/bin/python", |
| L"python", |
| NULL |
| }; |
| |
| /* For now, a static array of commands. */ |
| |
| #define MAX_COMMANDS 100 |
| |
| typedef struct { |
| wchar_t key[MAX_PATH]; |
| wchar_t value[MSGSIZE]; |
| } COMMAND; |
| |
| static COMMAND commands[MAX_COMMANDS]; |
| static int num_commands = 0; |
| |
| #if defined(SKIP_PREFIX) |
| |
| static wchar_t * builtin_prefixes [] = { |
| /* These must be in an order that the longest matches should be found, |
| * i.e. if the prefix is "/usr/bin/env ", it should match that entry |
| * *before* matching "/usr/bin/". |
| */ |
| L"/usr/bin/env ", |
| L"/usr/bin/", |
| L"/usr/local/bin/", |
| NULL |
| }; |
| |
| static wchar_t * skip_prefix(wchar_t * name) |
| { |
| wchar_t ** pp = builtin_prefixes; |
| wchar_t * result = name; |
| wchar_t * p; |
| size_t n; |
| |
| for (; p = *pp; pp++) { |
| n = wcslen(p); |
| if (_wcsnicmp(p, name, n) == 0) { |
| result += n; /* skip the prefix */ |
| if (p[n - 1] == L' ') /* No empty strings in table, so n > 1 */ |
| result = skip_whitespace(result); |
| break; |
| } |
| } |
| return result; |
| } |
| |
| #endif |
| |
| #if defined(SEARCH_PATH) |
| |
| static COMMAND path_command; |
| |
| static COMMAND * find_on_path(wchar_t * name) |
| { |
| wchar_t * pathext; |
| size_t varsize; |
| wchar_t * context = NULL; |
| wchar_t * extension; |
| COMMAND * result = NULL; |
| DWORD len; |
| errno_t rc; |
| |
| wcscpy_s(path_command.key, MAX_PATH, name); |
| if (wcschr(name, L'.') != NULL) { |
| /* assume it has an extension. */ |
| len = SearchPathW(NULL, name, NULL, MSGSIZE, path_command.value, NULL); |
| if (len) { |
| result = &path_command; |
| } |
| } |
| else { |
| /* No extension - search using registered extensions. */ |
| rc = _wdupenv_s(&pathext, &varsize, L"PATHEXT"); |
| if (rc == 0) { |
| extension = wcstok_s(pathext, L";", &context); |
| while (extension) { |
| len = SearchPathW(NULL, name, extension, MSGSIZE, path_command.value, NULL); |
| if (len) { |
| result = &path_command; |
| break; |
| } |
| extension = wcstok_s(NULL, L";", &context); |
| } |
| free(pathext); |
| } |
| } |
| return result; |
| } |
| |
| #endif |
| |
| static COMMAND * find_command(wchar_t * name) |
| { |
| COMMAND * result = NULL; |
| COMMAND * cp = commands; |
| int i; |
| |
| for (i = 0; i < num_commands; i++, cp++) { |
| if (_wcsicmp(cp->key, name) == 0) { |
| result = cp; |
| break; |
| } |
| } |
| #if defined(SEARCH_PATH) |
| if (result == NULL) |
| result = find_on_path(name); |
| #endif |
| return result; |
| } |
| |
| static void |
| update_command(COMMAND * cp, wchar_t * name, wchar_t * cmdline) |
| { |
| wcsncpy_s(cp->key, MAX_PATH, name, _TRUNCATE); |
| wcsncpy_s(cp->value, MSGSIZE, cmdline, _TRUNCATE); |
| } |
| |
| static void |
| add_command(wchar_t * name, wchar_t * cmdline) |
| { |
| if (num_commands >= MAX_COMMANDS) { |
| debug(L"can't add %s = '%s': no room\n", name, cmdline); |
| } |
| else { |
| COMMAND * cp = &commands[num_commands++]; |
| |
| update_command(cp, name, cmdline); |
| } |
| } |
| |
| static void |
| read_config_file(wchar_t * config_path) |
| { |
| wchar_t keynames[MSGSIZE]; |
| wchar_t value[MSGSIZE]; |
| DWORD read; |
| wchar_t * key; |
| COMMAND * cp; |
| wchar_t * cmdp; |
| |
| read = GetPrivateProfileStringW(L"commands", NULL, NULL, keynames, MSGSIZE, |
| config_path); |
| if (read == MSGSIZE - 1) { |
| debug(L"read_commands: %s: not enough space for names\n", config_path); |
| } |
| key = keynames; |
| while (*key) { |
| read = GetPrivateProfileStringW(L"commands", key, NULL, value, MSGSIZE, |
| config_path); |
| if (read == MSGSIZE - 1) { |
| debug(L"read_commands: %s: not enough space for %s\n", |
| config_path, key); |
| } |
| cmdp = skip_whitespace(value); |
| if (*cmdp) { |
| cp = find_command(key); |
| if (cp == NULL) |
| add_command(key, value); |
| else |
| update_command(cp, key, value); |
| } |
| key += wcslen(key) + 1; |
| } |
| } |
| |
| static void read_commands() |
| { |
| if (launcher_ini_path[0]) |
| read_config_file(launcher_ini_path); |
| if (appdata_ini_path[0]) |
| read_config_file(appdata_ini_path); |
| } |
| |
| static BOOL |
| parse_shebang(wchar_t * shebang_line, int nchars, wchar_t ** command, |
| wchar_t ** suffix) |
| { |
| BOOL rc = FALSE; |
| wchar_t ** vpp; |
| size_t plen; |
| wchar_t * p; |
| wchar_t zapped; |
| wchar_t * endp = shebang_line + nchars - 1; |
| COMMAND * cp; |
| wchar_t * skipped; |
| |
| *command = NULL; /* failure return */ |
| *suffix = NULL; |
| |
| if ((*shebang_line++ == L'#') && (*shebang_line++ == L'!')) { |
| shebang_line = skip_whitespace(shebang_line); |
| if (*shebang_line) { |
| *command = shebang_line; |
| for (vpp = builtin_virtual_paths; *vpp; ++vpp) { |
| plen = wcslen(*vpp); |
| if (wcsncmp(shebang_line, *vpp, plen) == 0) { |
| rc = TRUE; |
| /* We can do this because all builtin commands contain |
| * "python". |
| */ |
| *command = wcsstr(shebang_line, L"python"); |
| break; |
| } |
| } |
| if (*vpp == NULL) { |
| /* |
| * Not found in builtins - look in customised commands. |
| * |
| * We can't permanently modify the shebang line in case |
| * it's not a customised command, but we can temporarily |
| * stick a NUL after the command while searching for it, |
| * then put back the char we zapped. |
| */ |
| #if defined(SKIP_PREFIX) |
| skipped = skip_prefix(shebang_line); |
| #else |
| skipped = shebang_line; |
| #endif |
| p = wcspbrk(skipped, L" \t\r\n"); |
| if (p != NULL) { |
| zapped = *p; |
| *p = L'\0'; |
| } |
| cp = find_command(skipped); |
| if (p != NULL) |
| *p = zapped; |
| if (cp != NULL) { |
| *command = cp->value; |
| if (p != NULL) |
| *suffix = skip_whitespace(p); |
| } |
| } |
| /* remove trailing whitespace */ |
| while ((endp > shebang_line) && isspace(*endp)) |
| --endp; |
| if (endp > shebang_line) |
| endp[1] = L'\0'; |
| } |
| } |
| return rc; |
| } |
| |
| /* #define CP_UTF8 65001 defined in winnls.h */ |
| #define CP_UTF16LE 1200 |
| #define CP_UTF16BE 1201 |
| #define CP_UTF32LE 12000 |
| #define CP_UTF32BE 12001 |
| |
| typedef struct { |
| int length; |
| char sequence[4]; |
| UINT code_page; |
| } BOM; |
| |
| /* |
| * Strictly, we don't need to handle UTF-16 anf UTF-32, since Python itself |
| * doesn't. Never mind, one day it might - there's no harm leaving it in. |
| */ |
| static BOM BOMs[] = { |
| { 3, { 0xEF, 0xBB, 0xBF }, CP_UTF8 }, /* UTF-8 - keep first */ |
| { 2, { 0xFF, 0xFE }, CP_UTF16LE }, /* UTF-16LE */ |
| { 2, { 0xFE, 0xFF }, CP_UTF16BE }, /* UTF-16BE */ |
| { 4, { 0xFF, 0xFE, 0x00, 0x00 }, CP_UTF32LE }, /* UTF-32LE */ |
| { 4, { 0x00, 0x00, 0xFE, 0xFF }, CP_UTF32BE }, /* UTF-32BE */ |
| { 0 } /* sentinel */ |
| }; |
| |
| static BOM * |
| find_BOM(char * buffer) |
| { |
| /* |
| * Look for a BOM in the input and return a pointer to the |
| * corresponding structure, or NULL if not found. |
| */ |
| BOM * result = NULL; |
| BOM *bom; |
| |
| for (bom = BOMs; bom->length; bom++) { |
| if (strncmp(bom->sequence, buffer, bom->length) == 0) { |
| result = bom; |
| break; |
| } |
| } |
| return result; |
| } |
| |
| static char * |
| find_terminator(char * buffer, int len, BOM *bom) |
| { |
| char * result = NULL; |
| char * end = buffer + len; |
| char * p; |
| char c; |
| int cp; |
| |
| for (p = buffer; p < end; p++) { |
| c = *p; |
| if (c == '\r') { |
| result = p; |
| break; |
| } |
| if (c == '\n') { |
| result = p; |
| break; |
| } |
| } |
| if (result != NULL) { |
| cp = bom->code_page; |
| |
| /* adjustments to include all bytes of the char */ |
| /* no adjustment needed for UTF-8 or big endian */ |
| if (cp == CP_UTF16LE) |
| ++result; |
| else if (cp == CP_UTF32LE) |
| result += 3; |
| ++result; /* point just past terminator */ |
| } |
| return result; |
| } |
| |
| static BOOL |
| validate_version(wchar_t * p) |
| { |
| BOOL result = TRUE; |
| |
| if (!isdigit(*p)) /* expect major version */ |
| result = FALSE; |
| else if (*++p) { /* more to do */ |
| if (*p != L'.') /* major/minor separator */ |
| result = FALSE; |
| else { |
| ++p; |
| if (!isdigit(*p)) /* expect minor version */ |
| result = FALSE; |
| else { |
| ++p; |
| if (*p) { /* more to do */ |
| if (*p != L'-') |
| result = FALSE; |
| else { |
| ++p; |
| if ((*p != '3') && (*++p != '2') && !*++p) |
| result = FALSE; |
| } |
| } |
| } |
| } |
| } |
| return result; |
| } |
| |
| typedef struct { |
| unsigned short min; |
| unsigned short max; |
| wchar_t version[MAX_VERSION_SIZE]; |
| } PYC_MAGIC; |
| |
| static PYC_MAGIC magic_values[] = { |
| { 0xc687, 0xc687, L"2.0" }, |
| { 0xeb2a, 0xeb2a, L"2.1" }, |
| { 0xed2d, 0xed2d, L"2.2" }, |
| { 0xf23b, 0xf245, L"2.3" }, |
| { 0xf259, 0xf26d, L"2.4" }, |
| { 0xf277, 0xf2b3, L"2.5" }, |
| { 0xf2c7, 0xf2d1, L"2.6" }, |
| { 0xf2db, 0xf303, L"2.7" }, |
| { 0x0bb8, 0x0c3b, L"3.0" }, |
| { 0x0c45, 0x0c4f, L"3.1" }, |
| { 0x0c58, 0x0c6c, L"3.2" }, |
| { 0x0c76, 0x0c76, L"3.3" }, |
| { 0 } |
| }; |
| |
| static INSTALLED_PYTHON * |
| find_by_magic(unsigned short magic) |
| { |
| INSTALLED_PYTHON * result = NULL; |
| PYC_MAGIC * mp; |
| |
| for (mp = magic_values; mp->min; mp++) { |
| if ((magic >= mp->min) && (magic <= mp->max)) { |
| result = locate_python(mp->version); |
| if (result != NULL) |
| break; |
| } |
| } |
| return result; |
| } |
| |
| static void |
| maybe_handle_shebang(wchar_t ** argv, wchar_t * cmdline) |
| { |
| /* |
| * Look for a shebang line in the first argument. If found |
| * and we spawn a child process, this never returns. If it |
| * does return then we process the args "normally". |
| * |
| * argv[0] might be a filename with a shebang. |
| */ |
| FILE * fp; |
| errno_t rc = _wfopen_s(&fp, *argv, L"rb"); |
| unsigned char buffer[BUFSIZE]; |
| wchar_t shebang_line[BUFSIZE + 1]; |
| size_t read; |
| char *p; |
| char * start; |
| char * shebang_alias = (char *) shebang_line; |
| BOM* bom; |
| int i, j, nchars = 0; |
| int header_len; |
| BOOL is_virt; |
| wchar_t * command; |
| wchar_t * suffix; |
| INSTALLED_PYTHON * ip; |
| |
| if (rc == 0) { |
| read = fread(buffer, sizeof(char), BUFSIZE, fp); |
| debug(L"maybe_handle_shebang: read %d bytes\n", read); |
| fclose(fp); |
| |
| if ((read >= 4) && (buffer[3] == '\n') && (buffer[2] == '\r')) { |
| ip = find_by_magic((buffer[1] << 8 | buffer[0]) & 0xFFFF); |
| if (ip != NULL) { |
| debug(L"script file is compiled against Python %s\n", |
| ip->version); |
| invoke_child(ip->executable, NULL, cmdline); |
| } |
| } |
| /* Look for BOM */ |
| bom = find_BOM(buffer); |
| if (bom == NULL) { |
| start = buffer; |
| debug(L"maybe_handle_shebang: BOM not found, using UTF-8\n"); |
| bom = BOMs; /* points to UTF-8 entry - the default */ |
| } |
| else { |
| debug(L"maybe_handle_shebang: BOM found, code page %d\n", |
| bom->code_page); |
| start = &buffer[bom->length]; |
| } |
| p = find_terminator(start, BUFSIZE, bom); |
| /* |
| * If no CR or LF was found in the heading, |
| * we assume it's not a shebang file. |
| */ |
| if (p == NULL) { |
| debug(L"maybe_handle_shebang: No line terminator found\n"); |
| } |
| else { |
| /* |
| * Found line terminator - parse the shebang. |
| * |
| * Strictly, we don't need to handle UTF-16 anf UTF-32, |
| * since Python itself doesn't. |
| * Never mind, one day it might. |
| */ |
| header_len = (int) (p - start); |
| switch(bom->code_page) { |
| case CP_UTF8: |
| nchars = MultiByteToWideChar(bom->code_page, |
| 0, |
| start, header_len, shebang_line, |
| BUFSIZE); |
| break; |
| case CP_UTF16BE: |
| if (header_len % 2 != 0) { |
| debug(L"maybe_handle_shebang: UTF-16BE, but an odd number \ |
| of bytes: %d\n", header_len); |
| /* nchars = 0; Not needed - initialised to 0. */ |
| } |
| else { |
| for (i = header_len; i > 0; i -= 2) { |
| shebang_alias[i - 1] = start[i - 2]; |
| shebang_alias[i - 2] = start[i - 1]; |
| } |
| nchars = header_len / sizeof(wchar_t); |
| } |
| break; |
| case CP_UTF16LE: |
| if ((header_len % 2) != 0) { |
| debug(L"UTF-16LE, but an odd number of bytes: %d\n", |
| header_len); |
| /* nchars = 0; Not needed - initialised to 0. */ |
| } |
| else { |
| /* no actual conversion needed. */ |
| memcpy(shebang_line, start, header_len); |
| nchars = header_len / sizeof(wchar_t); |
| } |
| break; |
| case CP_UTF32BE: |
| if (header_len % 4 != 0) { |
| debug(L"UTF-32BE, but not divisible by 4: %d\n", |
| header_len); |
| /* nchars = 0; Not needed - initialised to 0. */ |
| } |
| else { |
| for (i = header_len, j = header_len / 2; i > 0; i -= 4, |
| j -= 2) { |
| shebang_alias[j - 1] = start[i - 2]; |
| shebang_alias[j - 2] = start[i - 1]; |
| } |
| nchars = header_len / sizeof(wchar_t); |
| } |
| break; |
| case CP_UTF32LE: |
| if (header_len % 4 != 0) { |
| debug(L"UTF-32LE, but not divisible by 4: %d\n", |
| header_len); |
| /* nchars = 0; Not needed - initialised to 0. */ |
| } |
| else { |
| for (i = header_len, j = header_len / 2; i > 0; i -= 4, |
| j -= 2) { |
| shebang_alias[j - 1] = start[i - 3]; |
| shebang_alias[j - 2] = start[i - 4]; |
| } |
| nchars = header_len / sizeof(wchar_t); |
| } |
| break; |
| } |
| if (nchars > 0) { |
| shebang_line[--nchars] = L'\0'; |
| is_virt = parse_shebang(shebang_line, nchars, &command, |
| &suffix); |
| if (command != NULL) { |
| debug(L"parse_shebang: found command: %s\n", command); |
| if (!is_virt) { |
| invoke_child(command, suffix, cmdline); |
| } |
| else { |
| suffix = wcschr(command, L' '); |
| if (suffix != NULL) { |
| *suffix++ = L'\0'; |
| suffix = skip_whitespace(suffix); |
| } |
| if (wcsncmp(command, L"python", 6)) |
| error(RC_BAD_VIRTUAL_PATH, L"Unknown virtual \ |
| path '%s'", command); |
| command += 6; /* skip past "python" */ |
| if (*command && !validate_version(command)) |
| error(RC_BAD_VIRTUAL_PATH, L"Invalid version \ |
| specification: '%s'.\nIn the first line of the script, 'python' needs to be \ |
| followed by a valid version specifier.\nPlease check the documentation.", |
| command); |
| /* TODO could call validate_version(command) */ |
| ip = locate_python(command); |
| if (ip == NULL) { |
| error(RC_NO_PYTHON, L"Requested Python version \ |
| (%s) is not installed", command); |
| } |
| else { |
| invoke_child(ip->executable, suffix, cmdline); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| static wchar_t * |
| skip_me(wchar_t * cmdline) |
| { |
| BOOL quoted; |
| wchar_t c; |
| wchar_t * result = cmdline; |
| |
| quoted = cmdline[0] == L'\"'; |
| if (!quoted) |
| c = L' '; |
| else { |
| c = L'\"'; |
| ++result; |
| } |
| result = wcschr(result, c); |
| if (result == NULL) /* when, for example, just exe name on command line */ |
| result = L""; |
| else { |
| ++result; /* skip past space or closing quote */ |
| result = skip_whitespace(result); |
| } |
| return result; |
| } |
| |
| static DWORD version_high = 0; |
| static DWORD version_low = 0; |
| |
| static void |
| get_version_info(wchar_t * version_text, size_t size) |
| { |
| WORD maj, min, rel, bld; |
| |
| if (!version_high && !version_low) |
| wcsncpy_s(version_text, size, L"0.1", _TRUNCATE); /* fallback */ |
| else { |
| maj = HIWORD(version_high); |
| min = LOWORD(version_high); |
| rel = HIWORD(version_low); |
| bld = LOWORD(version_low); |
| _snwprintf_s(version_text, size, _TRUNCATE, L"%d.%d.%d.%d", maj, |
| min, rel, bld); |
| } |
| } |
| |
| static int |
| process(int argc, wchar_t ** argv) |
| { |
| wchar_t * wp; |
| wchar_t * command; |
| wchar_t * p; |
| int rc = 0; |
| size_t plen; |
| INSTALLED_PYTHON * ip; |
| BOOL valid; |
| DWORD size, attrs; |
| HRESULT hr; |
| wchar_t message[MSGSIZE]; |
| wchar_t version_text [MAX_PATH]; |
| void * version_data; |
| VS_FIXEDFILEINFO * file_info; |
| UINT block_size; |
| |
| wp = get_env(L"PYLAUNCH_DEBUG"); |
| if ((wp != NULL) && (*wp != L'\0')) |
| log_fp = stderr; |
| |
| #if defined(_M_X64) |
| debug(L"launcher build: 64bit\n"); |
| #else |
| debug(L"launcher build: 32bit\n"); |
| #endif |
| #if defined(_WINDOWS) |
| debug(L"launcher executable: Windows\n"); |
| #else |
| debug(L"launcher executable: Console\n"); |
| #endif |
| /* Get the local appdata folder (non-roaming) */ |
| hr = SHGetFolderPathW(NULL, CSIDL_LOCAL_APPDATA, |
| NULL, 0, appdata_ini_path); |
| if (hr != S_OK) { |
| debug(L"SHGetFolderPath failed: %X\n", hr); |
| appdata_ini_path[0] = L'\0'; |
| } |
| else { |
| plen = wcslen(appdata_ini_path); |
| p = &appdata_ini_path[plen]; |
| wcsncpy_s(p, MAX_PATH - plen, L"\\py.ini", _TRUNCATE); |
| attrs = GetFileAttributesW(appdata_ini_path); |
| if (attrs == INVALID_FILE_ATTRIBUTES) { |
| debug(L"File '%s' non-existent\n", appdata_ini_path); |
| appdata_ini_path[0] = L'\0'; |
| } else { |
| debug(L"Using local configuration file '%s'\n", appdata_ini_path); |
| } |
| } |
| plen = GetModuleFileNameW(NULL, launcher_ini_path, MAX_PATH); |
| size = GetFileVersionInfoSizeW(launcher_ini_path, &size); |
| if (size == 0) { |
| winerror(GetLastError(), message, MSGSIZE); |
| debug(L"GetFileVersionInfoSize failed: %s\n", message); |
| } |
| else { |
| version_data = malloc(size); |
| if (version_data) { |
| valid = GetFileVersionInfoW(launcher_ini_path, 0, size, |
| version_data); |
| if (!valid) |
| debug(L"GetFileVersionInfo failed: %X\n", GetLastError()); |
| else { |
| valid = VerQueryValueW(version_data, L"\\", &file_info, |
| &block_size); |
| if (!valid) |
| debug(L"VerQueryValue failed: %X\n", GetLastError()); |
| else { |
| version_high = file_info->dwFileVersionMS; |
| version_low = file_info->dwFileVersionLS; |
| } |
| } |
| free(version_data); |
| } |
| } |
| p = wcsrchr(launcher_ini_path, L'\\'); |
| if (p == NULL) { |
| debug(L"GetModuleFileNameW returned value has no backslash: %s\n", |
| launcher_ini_path); |
| launcher_ini_path[0] = L'\0'; |
| } |
| else { |
| wcsncpy_s(p, MAX_PATH - (p - launcher_ini_path), L"\\py.ini", |
| _TRUNCATE); |
| attrs = GetFileAttributesW(launcher_ini_path); |
| if (attrs == INVALID_FILE_ATTRIBUTES) { |
| debug(L"File '%s' non-existent\n", launcher_ini_path); |
| launcher_ini_path[0] = L'\0'; |
| } else { |
| debug(L"Using global configuration file '%s'\n", launcher_ini_path); |
| } |
| } |
| |
| command = skip_me(GetCommandLineW()); |
| debug(L"Called with command line: %s", command); |
| if (argc <= 1) { |
| valid = FALSE; |
| p = NULL; |
| } |
| else { |
| p = argv[1]; |
| plen = wcslen(p); |
| if (p[0] != L'-') { |
| read_commands(); |
| maybe_handle_shebang(&argv[1], command); |
| } |
| /* No file with shebang, or an unrecognised shebang. |
| * Is the first arg a special version qualifier? |
| */ |
| valid = (*p == L'-') && validate_version(&p[1]); |
| if (valid) { |
| ip = locate_python(&p[1]); |
| if (ip == NULL) |
| error(RC_NO_PYTHON, L"Requested Python version (%s) not \ |
| installed", &p[1]); |
| command += wcslen(p); |
| command = skip_whitespace(command); |
| } |
| } |
| if (!valid) { |
| ip = locate_python(L""); |
| if (ip == NULL) |
| error(RC_NO_PYTHON, L"Can't find a default Python."); |
| if ((argc == 2) && (!_wcsicmp(p, L"-h") || !_wcsicmp(p, L"--help"))) { |
| #if defined(_M_X64) |
| BOOL canDo64bit = TRUE; |
| #else |
| // If we are a 32bit process on a 64bit Windows, first hit the 64bit keys. |
| BOOL canDo64bit = FALSE; |
| IsWow64Process(GetCurrentProcess(), &canDo64bit); |
| #endif |
| |
| get_version_info(version_text, MAX_PATH); |
| fwprintf(stdout, L"\ |
| Python Launcher for Windows Version %s\n\n", version_text); |
| fwprintf(stdout, L"\ |
| usage: %s [ launcher-arguments ] script [ script-arguments ]\n\n", argv[0]); |
| fputws(L"\ |
| Launcher arguments:\n\n\ |
| -2 : Launch the latest Python 2.x version\n\ |
| -3 : Launch the latest Python 3.x version\n\ |
| -X.Y : Launch the specified Python version\n", stdout); |
| if (canDo64bit) { |
| fputws(L"\ |
| -X.Y-32: Launch the specified 32bit Python version", stdout); |
| } |
| fputws(L"\n\nThe following help text is from Python:\n\n", stdout); |
| fflush(stdout); |
| } |
| } |
| invoke_child(ip->executable, NULL, command); |
| return rc; |
| } |
| |
| #if defined(_WINDOWS) |
| |
| int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, |
| LPWSTR lpstrCmd, int nShow) |
| { |
| return process(__argc, __wargv); |
| } |
| |
| #else |
| |
| int cdecl wmain(int argc, wchar_t ** argv) |
| { |
| return process(argc, argv); |
| } |
| |
| #endif |