feat(process): allow commands and envs on proces_start (#1477)
* feat(process): allow commands and envs on proces_start * refactor(process): copy process arguments once whenever possible Refactors the code to use an arglist type which is just lpCmdline on Windows and a list in Linux. The function automatically escapes the command when it is needed, avoiding a second copy. This also allows UTF-8 commands btw. * fix(process): fix invalid dereference * refactor(process): mark xstrdup as potentially unused * feat(process): add parent process environment when launching process * fix(process): fix operator precedence with array operators * fix(process): fix segfault when freeing random memory * fix(process): fix wrong check for setenv() * fix(process): fix accidentally initializing an array by assignment * fix(process): clear return value if success
This commit is contained in:
Takase
GitHub
parent
ad1597125e
commit
142f0a17ba
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@ -31,6 +31,8 @@
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typedef DWORD process_error_t;
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typedef HANDLE process_stream_t;
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typedef HANDLE process_handle_t;
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typedef wchar_t process_arglist_t[32767];
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typedef wchar_t *process_env_t;
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#define HANDLE_INVALID (INVALID_HANDLE_VALUE)
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#define PROCESS_GET_HANDLE(P) ((P)->process_information.hProcess)
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@ -42,12 +44,20 @@ static volatile long PipeSerialNumber;
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typedef int process_error_t;
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typedef int process_stream_t;
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typedef pid_t process_handle_t;
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typedef char **process_arglist_t;
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typedef char **process_env_t;
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#define HANDLE_INVALID (0)
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#define PROCESS_GET_HANDLE(P) ((P)->pid)
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#endif
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#ifdef __GNUC__
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#define UNUSED __attribute__((__unused__))
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#else
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#define UNUSED
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#endif
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typedef struct {
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bool running, detached;
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int returncode, deadline;
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@ -339,14 +349,248 @@ static bool signal_process(process_t* proc, signal_e sig) {
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return true;
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}
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static UNUSED char *xstrdup(const char *str) {
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char *result = str ? malloc(strlen(str) + 1) : NULL;
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if (result) strcpy(result, str);
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return result;
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}
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static int process_arglist_init(process_arglist_t *list, size_t *list_len, size_t nargs) {
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*list_len = 0;
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#ifdef _WIN32
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memset(*list, 0, sizeof(process_arglist_t));
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#else
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*list = calloc(sizeof(char *), nargs + 1);
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if (!*list) return ENOMEM;
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#endif
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return 0;
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}
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static int process_arglist_add(process_arglist_t *list, size_t *list_len, const char *arg, bool escape) {
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size_t len = *list_len;
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#ifdef _WIN32
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int arg_len;
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wchar_t *cmdline = *list;
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wchar_t arg_w[32767];
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// this length includes the null terminator!
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if (!(arg_len = MultiByteToWideChar(CP_UTF8, 0, arg, -1, arg_w, 32767)))
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return GetLastError();
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if (arg_len + len > 32767)
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return ERROR_NOT_ENOUGH_MEMORY;
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if (!escape) {
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// replace the current null terminator with a space
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if (len > 0) cmdline[len-1] = ' ';
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memcpy(cmdline + len, arg_w, arg_len * sizeof(wchar_t));
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len += arg_len;
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} else {
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// if the string contains spaces, then we must quote it
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bool quote = wcspbrk(arg_w, L" \t\v\r\n");
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int backslash = 0, escaped_len = quote ? 2 : 0;
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for (int i = 0; i < arg_len; i++) {
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if (arg_w[i] == L'\\') {
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backslash++;
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} else if (arg_w[i] == L'"') {
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escaped_len += backslash + 1;
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backslash = 0;
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} else {
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backslash = 0;
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}
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escaped_len++;
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}
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// escape_len contains NUL terminator
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if (escaped_len + len > 32767)
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return ERROR_NOT_ENOUGH_MEMORY;
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// replace our previous NUL terminator with space
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if (len > 0) cmdline[len-1] = L' ';
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if (quote) cmdline[len++] = L'"';
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// we are not going to iterate over NUL terminator
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for (int i = 0;arg_w[i]; i++) {
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if (arg_w[i] == L'\\') {
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backslash++;
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} else if (arg_w[i] == L'"') {
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// add backslash + 1 backslashes
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for (int j = 0; j < backslash; j++)
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cmdline[len++] = L'\\';
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cmdline[len++] = L'\\';
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backslash = 0;
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} else {
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backslash = 0;
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}
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cmdline[len++] = arg_w[i];
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}
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if (quote) cmdline[len++] = L'"';
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cmdline[len++] = L'\0';
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}
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#else
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char **cmd = *list;
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cmd[len] = xstrdup(arg);
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if (!cmd[len]) return ENOMEM;
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len++;
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#endif
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*list_len = len;
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return 0;
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}
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static void process_arglist_free(process_arglist_t *list) {
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#ifndef _WIN32
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char **cmd = *list;
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for (int i = 0; cmd[i]; i++)
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free(cmd[i]);
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free(cmd);
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*list = NULL;
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#endif
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}
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static int process_env_init(process_env_t *env_list, size_t *env_len, size_t nenv) {
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*env_len = 0;
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#ifdef _WIN32
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*env_list = NULL;
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#else
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*env_list = calloc(sizeof(char *), nenv * 2);
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if (!*env_list) return ENOMEM;
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#endif
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return 0;
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}
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#ifdef _WIN32
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static int cmp_name(wchar_t *a, wchar_t *b) {
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wchar_t _A[32767], _B[32767], *A = _A, *B = _B, *a_eq, *b_eq;
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int na, nb, r;
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a_eq = wcschr(a, L'=');
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b_eq = wcschr(b, L'=');
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assert(a_eq);
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assert(b_eq);
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na = a_eq - a;
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nb = b_eq - b;
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r = LCMapStringW(LOCALE_INVARIANT, LCMAP_UPPERCASE, a, na, A, na);
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assert(r == na);
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A[na] = L'\0';
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r = LCMapStringW(LOCALE_INVARIANT, LCMAP_UPPERCASE, b, nb, B, nb);
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assert(r == nb);
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B[nb] = L'\0';
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for (;;) {
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wchar_t AA = *A++, BB = *B++;
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if (AA > BB)
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return 1;
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else if (AA < BB)
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return -1;
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else if (!AA && !BB)
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return 0;
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}
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}
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static int process_env_add_variable(process_env_t *env_list, size_t *env_list_len, wchar_t *var, size_t var_len) {
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wchar_t *list, *list_p;
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size_t block_var_len, list_len;
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list = list_p = *env_list;
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list_len = *env_list_len;
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if (list_len) {
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// check if it is already in the block
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while ((block_var_len = wcslen(list_p))) {
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if (cmp_name(list_p, var) == 0)
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return -1; // already installed
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list_p += block_var_len + 1;
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}
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}
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// allocate list + 1 characters for the block terminator
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list = realloc(list, (list_len + var_len + 1) * sizeof(wchar_t));
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if (!list) return ERROR_NOT_ENOUGH_MEMORY;
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// copy the env variable to the block
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memcpy(list + list_len, var, var_len * sizeof(wchar_t));
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// terminate the block again
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list[list_len + var_len] = L'\0';
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*env_list = list;
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*env_list_len = (list_len + var_len);
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return 0;
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}
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static int process_env_add_system(process_env_t *env_list, size_t *env_list_len) {
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int retval = 0;
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wchar_t *proc_env_block, *proc_env_block_p;
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int proc_env_len;
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proc_env_block = proc_env_block_p = GetEnvironmentStringsW();
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while ((proc_env_len = wcslen(proc_env_block_p))) {
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// try to add it to the list
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if ((retval = process_env_add_variable(env_list, env_list_len, proc_env_block_p, proc_env_len + 1)) > 0)
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goto cleanup;
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proc_env_block_p += proc_env_len + 1;
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}
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retval = 0;
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cleanup:
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if (proc_env_block) FreeEnvironmentStringsW(proc_env_block);
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return retval;
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}
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#endif
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static int process_env_add(process_env_t *env_list, size_t *env_len, const char *key, const char *value) {
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#ifdef _WIN32
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wchar_t env_var[32767];
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int r, var_len = 0;
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if (!(r = MultiByteToWideChar(CP_UTF8, 0, key, -1, env_var, 32767)))
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return GetLastError();
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var_len += r;
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env_var[var_len-1] = L'=';
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if (!(r = MultiByteToWideChar(CP_UTF8, 0, value, -1, env_var + var_len, 32767 - var_len)))
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return GetLastError();
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var_len += r;
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return process_env_add_variable(env_list, env_len, env_var, var_len);
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#else
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(*env_list)[*env_len] = xstrdup(key);
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if (!(*env_list)[*env_len])
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return ENOMEM;
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(*env_list)[*env_len + 1] = xstrdup(value);
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if (!(*env_list)[*env_len + 1])
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return ENOMEM;
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*env_len += 2;
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#endif
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return 0;
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}
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static void process_env_free(process_env_t *list) {
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if (!*list) return;
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#ifdef _WIN32
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free(*list);
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#else
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for (size_t i = 0; (*list)[i]; i++) free((*list)[i]);
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free(*list);
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#endif
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*list = NULL;
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}
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static int process_start(lua_State* L) {
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int retval = 1;
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size_t env_len = 0, key_len, val_len;
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const char *cmd[256] = { NULL }, *env_names[256] = { NULL }, *env_values[256] = { NULL }, *cwd = NULL;
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bool detach = false, literal = false;
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int r, retval = 1;
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size_t env_len = 0, cmd_len = 0, arglist_len = 0, env_vars_len = 0;
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process_arglist_t arglist;
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process_env_t env_vars = NULL;
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const char *cwd = NULL;
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bool detach = false, escape = true;
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int deadline = 10, new_fds[3] = { STDIN_FD, STDOUT_FD, STDERR_FD };
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size_t arg_len = lua_gettop(L), cmd_len;
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if (lua_type(L, 1) == LUA_TTABLE) {
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if (lua_isstring(L, 1)) {
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escape = false;
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// create a table that contains the string as the value
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lua_createtable(L, 1, 0);
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lua_pushvalue(L, 1);
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lua_rawseti(L, -2, 1);
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lua_replace(L, 1);
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}
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luaL_checktype(L, 1, LUA_TTABLE);
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#if LUA_VERSION_NUM > 501
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lua_len(L, 1);
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#else
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@ -354,36 +598,15 @@ static int process_start(lua_State* L) {
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#endif
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cmd_len = luaL_checknumber(L, -1); lua_pop(L, 1);
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if (!cmd_len)
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// we have not allocated anything here yet, so we can skip cleanup code
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// don't do this anywhere else!
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return luaL_argerror(L, 1, "table cannot be empty");
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// check if each arguments is a string
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for (size_t i = 1; i <= cmd_len; ++i) {
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lua_pushinteger(L, i);
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lua_rawget(L, 1);
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cmd[i-1] = luaL_checkstring(L, -1);
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}
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} else {
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literal = true;
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cmd[0] = luaL_checkstring(L, 1);
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cmd_len = 1;
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lua_rawgeti(L, 1, i);
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luaL_checkstring(L, -1);
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lua_pop(L, 1);
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}
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if (arg_len > 1) {
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lua_getfield(L, 2, "env");
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if (!lua_isnil(L, -1)) {
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lua_pushnil(L);
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while (lua_next(L, -2) != 0) {
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const char* key = luaL_checklstring(L, -2, &key_len);
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const char* val = luaL_checklstring(L, -1, &val_len);
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env_names[env_len] = malloc(key_len+1);
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strcpy((char*)env_names[env_len], key);
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env_values[env_len] = malloc(val_len+1);
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strcpy((char*)env_values[env_len], val);
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lua_pop(L, 1);
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++env_len;
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}
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} else
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lua_pop(L, 1);
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if (lua_istable(L, 2)) {
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lua_getfield(L, 2, "detach"); detach = lua_toboolean(L, -1);
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lua_getfield(L, 2, "timeout"); deadline = luaL_optnumber(L, -1, deadline);
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lua_getfield(L, 2, "cwd"); cwd = luaL_optstring(L, -1, NULL);
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@ -391,12 +614,55 @@ static int process_start(lua_State* L) {
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lua_getfield(L, 2, "stdout"); new_fds[STDOUT_FD] = luaL_optnumber(L, -1, STDOUT_FD);
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lua_getfield(L, 2, "stderr"); new_fds[STDERR_FD] = luaL_optnumber(L, -1, STDERR_FD);
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for (int stream = STDIN_FD; stream <= STDERR_FD; ++stream) {
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if (new_fds[stream] > STDERR_FD || new_fds[stream] < REDIRECT_PARENT) {
|
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lua_pushfstring(L, "error: redirect to handles, FILE* and paths are not supported");
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if (new_fds[stream] > STDERR_FD || new_fds[stream] < REDIRECT_PARENT)
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return luaL_error(L, "error: redirect to handles, FILE* and paths are not supported");
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}
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lua_pop(L, 6); // pop all the values above
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|
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luaL_getsubtable(L, 2, "env");
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// count environment variobles
|
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lua_pushnil(L);
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while (lua_next(L, -2) != 0) {
|
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luaL_checkstring(L, -2);
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luaL_checkstring(L, -1);
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lua_pop(L, 1);
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env_len++;
|
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}
|
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|
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if (env_len) {
|
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if ((r = process_env_init(&env_vars, &env_vars_len, env_len)) != 0) {
|
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retval = -1;
|
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push_error(L, "cannot allocate environment list", r);
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goto cleanup;
|
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}
|
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|
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lua_pushnil(L);
|
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while (lua_next(L, -2) != 0) {
|
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if ((r = process_env_add(&env_vars, &env_vars_len, lua_tostring(L, -2), lua_tostring(L, -1))) != 0) {
|
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retval = -1;
|
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push_error(L, "cannot copy environment variable", r);
|
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goto cleanup;
|
||||
}
|
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lua_pop(L, 1);
|
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env_len++;
|
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}
|
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}
|
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}
|
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|
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// allocate and copy commands
|
||||
if ((r = process_arglist_init(&arglist, &arglist_len, cmd_len)) != 0) {
|
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retval = -1;
|
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push_error(L, "cannot create argument list", r);
|
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goto cleanup;
|
||||
}
|
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for (size_t i = 1; i <= cmd_len; i++) {
|
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lua_rawgeti(L, 1, i);
|
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if ((r = process_arglist_add(&arglist, &arglist_len, lua_tostring(L, -1), escape)) != 0) {
|
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retval = -1;
|
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push_error(L, "cannot add argument", r);
|
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goto cleanup;
|
||||
}
|
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lua_pop(L, 1);
|
||||
}
|
||||
|
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process_t* self = lua_newuserdata(L, sizeof(process_t));
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|
|
@ -405,6 +671,13 @@ static int process_start(lua_State* L) {
|
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self->deadline = deadline;
|
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self->detached = detach;
|
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#if _WIN32
|
||||
if (env_vars) {
|
||||
if ((r = process_env_add_system(&env_vars, &env_vars_len)) != 0) {
|
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retval = -1;
|
||||
push_error(L, "cannot add environment variable", r);
|
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goto cleanup;
|
||||
}
|
||||
}
|
||||
for (int i = 0; i < 3; ++i) {
|
||||
switch (new_fds[i]) {
|
||||
case REDIRECT_PARENT:
|
||||
|
|
@ -455,7 +728,7 @@ static int process_start(lua_State* L) {
|
|||
self->child_pipes[i][1] = self->child_pipes[new_fds[i]][1];
|
||||
}
|
||||
}
|
||||
STARTUPINFO siStartInfo;
|
||||
STARTUPINFOW siStartInfo;
|
||||
memset(&self->process_information, 0, sizeof(self->process_information));
|
||||
memset(&siStartInfo, 0, sizeof(siStartInfo));
|
||||
siStartInfo.cb = sizeof(siStartInfo);
|
||||
|
|
@ -463,48 +736,10 @@ static int process_start(lua_State* L) {
|
|||
siStartInfo.hStdInput = self->child_pipes[STDIN_FD][0];
|
||||
siStartInfo.hStdOutput = self->child_pipes[STDOUT_FD][1];
|
||||
siStartInfo.hStdError = self->child_pipes[STDERR_FD][1];
|
||||
char commandLine[32767] = { 0 }, environmentBlock[32767], wideEnvironmentBlock[32767*2];
|
||||
int offset = 0;
|
||||
if (!literal) {
|
||||
for (size_t i = 0; i < cmd_len; ++i) {
|
||||
size_t len = strlen(cmd[i]);
|
||||
if (offset + len + 2 >= sizeof(commandLine)) break;
|
||||
if (i > 0)
|
||||
commandLine[offset++] = ' ';
|
||||
commandLine[offset++] = '"';
|
||||
int backslashCount = 0; // Yes, this is necessary.
|
||||
for (size_t j = 0; j < len && offset + 2 + backslashCount < sizeof(commandLine); ++j) {
|
||||
if (cmd[i][j] == '\\')
|
||||
++backslashCount;
|
||||
else if (cmd[i][j] == '"') {
|
||||
for (size_t k = 0; k < backslashCount; ++k)
|
||||
commandLine[offset++] = '\\';
|
||||
commandLine[offset++] = '\\';
|
||||
backslashCount = 0;
|
||||
} else
|
||||
backslashCount = 0;
|
||||
commandLine[offset++] = cmd[i][j];
|
||||
}
|
||||
if (offset + 1 + backslashCount >= sizeof(commandLine)) break;
|
||||
for (size_t k = 0; k < backslashCount; ++k)
|
||||
commandLine[offset++] = '\\';
|
||||
commandLine[offset++] = '"';
|
||||
}
|
||||
commandLine[offset] = 0;
|
||||
} else {
|
||||
strncpy(commandLine, cmd[0], sizeof(commandLine));
|
||||
}
|
||||
offset = 0;
|
||||
for (size_t i = 0; i < env_len; ++i) {
|
||||
if (offset + strlen(env_values[i]) + strlen(env_names[i]) + 1 >= sizeof(environmentBlock))
|
||||
break;
|
||||
offset += snprintf(&environmentBlock[offset], sizeof(environmentBlock) - offset, "%s=%s", env_names[i], env_values[i]);
|
||||
environmentBlock[offset++] = 0;
|
||||
}
|
||||
environmentBlock[offset++] = 0;
|
||||
if (env_len > 0)
|
||||
MultiByteToWideChar(CP_UTF8, MB_PRECOMPOSED, environmentBlock, offset, (LPWSTR)wideEnvironmentBlock, sizeof(wideEnvironmentBlock));
|
||||
if (!CreateProcess(NULL, commandLine, NULL, NULL, true, (detach ? DETACHED_PROCESS : CREATE_NO_WINDOW) | CREATE_UNICODE_ENVIRONMENT, env_len > 0 ? wideEnvironmentBlock : NULL, cwd, &siStartInfo, &self->process_information)) {
|
||||
wchar_t cwd_w[MAX_PATH];
|
||||
if (cwd) // TODO: error handling
|
||||
MultiByteToWideChar(CP_UTF8, 0, cwd, -1, cwd_w, MAX_PATH);
|
||||
if (!CreateProcessW(NULL, arglist, NULL, NULL, true, (detach ? DETACHED_PROCESS : CREATE_NO_WINDOW) | CREATE_UNICODE_ENVIRONMENT, env_vars, cwd ? cwd_w : NULL, &siStartInfo, &self->process_information)) {
|
||||
push_error(L, NULL, GetLastError());
|
||||
retval = -1;
|
||||
goto cleanup;
|
||||
|
|
@ -552,9 +787,9 @@ static int process_start(lua_State* L) {
|
|||
close(self->child_pipes[stream][stream == STDIN_FD ? 1 : 0]);
|
||||
}
|
||||
size_t set;
|
||||
for (set = 0; set < env_len && setenv(env_names[set], env_values[set], 1) == 0; ++set);
|
||||
if (set == env_len && (!detach || setsid() != -1) && (!cwd || chdir(cwd) != -1))
|
||||
execvp(cmd[0], (char** const)cmd);
|
||||
for (set = 0; set < env_vars_len && setenv(env_vars[set], env_vars[set+1], 1) == 0; set += 2);
|
||||
if (set == env_vars_len && (!detach || setsid() != -1) && (!cwd || chdir(cwd) != -1))
|
||||
execvp(arglist[0], (char** const)arglist);
|
||||
write(control_pipe[1], &errno, sizeof(errno));
|
||||
_exit(-1);
|
||||
}
|
||||
|
|
@ -588,16 +823,15 @@ static int process_start(lua_State* L) {
|
|||
if (control_pipe[0]) close(control_pipe[0]);
|
||||
if (control_pipe[1]) close(control_pipe[1]);
|
||||
#endif
|
||||
for (size_t i = 0; i < env_len; ++i) {
|
||||
free((char*)env_names[i]);
|
||||
free((char*)env_values[i]);
|
||||
}
|
||||
for (int stream = 0; stream < 3; ++stream) {
|
||||
process_stream_t* pipe = &self->child_pipes[stream][stream == STDIN_FD ? 0 : 1];
|
||||
if (*pipe) {
|
||||
close_fd(pipe);
|
||||
}
|
||||
}
|
||||
process_arglist_free(&arglist);
|
||||
process_env_free(&env_vars);
|
||||
|
||||
if (retval == -1)
|
||||
return lua_error(L);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue