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- #include "nssm.h"
- /* Get path, share mode, creation disposition and flags for a stream. */
- int get_createfile_parameters(HKEY key, char *prefix, char *path, unsigned long *sharing, unsigned long default_sharing, unsigned long *disposition, unsigned long default_disposition, unsigned long *flags, unsigned long default_flags) {
- char value[NSSM_STDIO_LENGTH];
- /* Path. */
- if (_snprintf_s(value, sizeof(value), _TRUNCATE, "%s", prefix) < 0) {
- log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_OUT_OF_MEMORY, prefix, "get_createfile_parameters()", 0);
- return 1;
- }
- switch (expand_parameter(key, value, path, MAX_PATH, true, false)) {
- case 0: if (! path[0]) return 0; break; /* OK. */
- default: return 2; /* Error. */
- }
- /* ShareMode. */
- if (_snprintf_s(value, sizeof(value), _TRUNCATE, "%s%s", prefix, NSSM_REG_STDIO_SHARING) < 0) {
- log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_OUT_OF_MEMORY, NSSM_REG_STDIO_SHARING, "get_createfile_parameters()", 0);
- return 3;
- }
- switch (get_number(key, value, sharing, false)) {
- case 0: *sharing = default_sharing; break; /* Missing. */
- case 1: break; /* Found. */
- case -2: return 4; break; /* Error. */
- }
- /* CreationDisposition. */
- if (_snprintf_s(value, sizeof(value), _TRUNCATE, "%s%s", prefix, NSSM_REG_STDIO_DISPOSITION) < 0) {
- log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_OUT_OF_MEMORY, NSSM_REG_STDIO_DISPOSITION, "get_createfile_parameters()", 0);
- return 5;
- }
- switch (get_number(key, value, disposition, false)) {
- case 0: *disposition = default_disposition; break; /* Missing. */
- case 1: break; /* Found. */
- case -2: return 6; break; /* Error. */
- }
- /* Flags. */
- if (_snprintf_s(value, sizeof(value), _TRUNCATE, "%s%s", prefix, NSSM_REG_STDIO_FLAGS) < 0) {
- log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_OUT_OF_MEMORY, NSSM_REG_STDIO_FLAGS, "get_createfile_parameters()", 0);
- return 7;
- }
- switch (get_number(key, value, flags, false)) {
- case 0: *flags = default_flags; break; /* Missing. */
- case 1: break; /* Found. */
- case -2: return 8; break; /* Error. */
- }
- return 0;
- }
- int set_createfile_parameter(HKEY key, char *prefix, char *suffix, unsigned long number) {
- char value[NSSM_STDIO_LENGTH];
- if (_snprintf_s(value, sizeof(value), _TRUNCATE, "%s%s", prefix, suffix) < 0) {
- log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_OUT_OF_MEMORY, suffix, "set_createfile_parameter()", 0);
- return 1;
- }
- return set_number(key, value, number);
- }
- HANDLE append_to_file(char *path, unsigned long sharing, SECURITY_ATTRIBUTES *attributes, unsigned long disposition, unsigned long flags) {
- HANDLE ret;
- /* Try to append to the file first. */
- ret = CreateFile(path, FILE_APPEND_DATA, sharing, attributes, disposition, flags, 0);
- if (ret) {
- SetEndOfFile(ret);
- return ret;
- }
- unsigned long error = GetLastError();
- if (error != ERROR_FILE_NOT_FOUND) {
- log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_CREATEFILE_FAILED, path, error_string(error));
- return (HANDLE) 0;
- }
- /* It didn't exist. Create it. */
- return CreateFile(path, FILE_WRITE_DATA, sharing, attributes, disposition, flags, 0);
- }
- int get_output_handles(HKEY key, STARTUPINFO *si) {
- char path[MAX_PATH];
- char stdout_path[MAX_PATH];
- unsigned long sharing, disposition, flags;
- bool set_flags = false;
- /* Standard security attributes allowing inheritance. */
- SECURITY_ATTRIBUTES attributes;
- ZeroMemory(&attributes, sizeof(attributes));
- attributes.bInheritHandle = true;
- /* stdin */
- if (get_createfile_parameters(key, NSSM_REG_STDIN, path, &sharing, NSSM_STDIN_SHARING, &disposition, NSSM_STDIN_DISPOSITION, &flags, NSSM_STDIN_FLAGS)) return 1;
- if (path[0]) {
- si->hStdInput = CreateFile(path, FILE_READ_DATA, sharing, &attributes, disposition, flags, 0);
- if (! si->hStdInput) {
- log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_CREATEFILE_FAILED, path, error_string(GetLastError()));
- return 2;
- }
- set_flags = true;
- }
- /* stdout */
- if (get_createfile_parameters(key, NSSM_REG_STDOUT, path, &sharing, NSSM_STDOUT_SHARING, &disposition, NSSM_STDOUT_DISPOSITION, &flags, NSSM_STDOUT_FLAGS)) return 3;
- if (path[0]) {
- /* Remember path for comparison with stderr. */
- if (_snprintf_s(stdout_path, sizeof(stdout_path), _TRUNCATE, "%s", path) < 0) {
- log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_OUT_OF_MEMORY, "stdout_path", "get_output_handles", 0);
- return 4;
- }
- si->hStdOutput = append_to_file(path, sharing, &attributes, disposition, flags);
- if (! si->hStdOutput) return 5;
- set_flags = true;
- }
- else ZeroMemory(stdout_path, sizeof(stdout_path));
- /* stderr */
- if (get_createfile_parameters(key, NSSM_REG_STDERR, path, &sharing, NSSM_STDERR_SHARING, &disposition, NSSM_STDERR_DISPOSITION, &flags, NSSM_STDERR_FLAGS)) return 6;
- if (path[0]) {
- /* Same as stdin? */
- if (str_equiv(path, stdout_path)) {
- /* Two handles to the same file will create a race. */
- if (! DuplicateHandle(GetCurrentProcess(), si->hStdOutput, GetCurrentProcess(), &si->hStdError, 0, true, DUPLICATE_SAME_ACCESS)) {
- log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_DUPLICATEHANDLE_FAILED, NSSM_REG_STDOUT, error_string(GetLastError()));
- return 7;
- }
- }
- else {
- si->hStdError = append_to_file(path, sharing, &attributes, disposition, flags);
- if (! si->hStdError) {
- log_event(EVENTLOG_ERROR_TYPE, NSSM_EVENT_CREATEFILE_FAILED, path, error_string(GetLastError()));
- return 8;
- }
- SetEndOfFile(si->hStdError);
- }
- set_flags = true;
- }
- if (! set_flags) return 0;
- /*
- We need to set the startup_info flags to make the new handles
- inheritable by the new process.
- */
- si->dwFlags |= STARTF_USESTDHANDLES;
- return 0;
- }
- void close_output_handles(STARTUPINFO *si) {
- if (si->hStdInput) CloseHandle(si->hStdInput);
- if (si->hStdOutput) CloseHandle(si->hStdOutput);
- if (si->hStdError) CloseHandle(si->hStdError);
- }
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