forked from osmocom/wireshark
5c52ab7e45
Continuation from I162b1322fd970777d2156d869e95b005b0f045ac Change-Id: I5c93ad7eb5145577403721f3dd1ee8e836a4a828 Ping-Bug: 12845 Reviewed-on: https://code.wireshark.org/review/25025 Petri-Dish: Michael Mann <mmann78@netscape.net> Tested-by: Petri Dish Buildbot Reviewed-by: Michael Mann <mmann78@netscape.net>
382 lines
11 KiB
C
382 lines
11 KiB
C
/* extcap_spawn.c
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*
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* Routines to spawn extcap external capture programs
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* Copyright 2016, Roland Knall <rknall@gmail.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <config.h>
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#include <stdio.h>
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#include <glib.h>
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#include <string.h>
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#include <wsutil/file_util.h>
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#include <wsutil/filesystem.h>
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#include <wsutil/ws_pipe.h>
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#ifdef _WIN32
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#include <wsutil/win32-utils.h>
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#endif
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#include <log.h>
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#include "extcap.h"
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#include "extcap_spawn.h"
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gboolean extcap_spawn_sync(gchar *dirname, gchar *command, gint argc, gchar **args, gchar **command_output)
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{
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gboolean status = FALSE;
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gboolean result = FALSE;
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gchar **argv = NULL;
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gint cnt = 0;
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gchar *local_output = NULL;
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#ifdef _WIN32
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#define BUFFER_SIZE 16384
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GString *winargs = g_string_sized_new(200);
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gchar *quoted_arg;
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gunichar2 *wcommandline;
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STARTUPINFO info;
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PROCESS_INFORMATION processInfo;
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SECURITY_ATTRIBUTES sa;
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HANDLE child_stdout_rd = NULL;
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HANDLE child_stdout_wr = NULL;
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HANDLE child_stderr_rd = NULL;
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HANDLE child_stderr_wr = NULL;
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const gchar *oldpath = g_getenv("PATH");
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gchar *newpath = NULL;
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#else
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gint exit_status = 0;
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#endif
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argv = (gchar **) g_malloc0(sizeof(gchar *) * (argc + 2));
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#ifdef _WIN32
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newpath = g_strdup_printf("%s;%s", g_strescape(get_progfile_dir(), NULL), oldpath);
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g_setenv("PATH", newpath, TRUE);
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argv[0] = g_strescape(command, NULL);
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#else
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argv[0] = g_strdup(command);
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#endif
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for (cnt = 0; cnt < argc; cnt++)
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argv[cnt + 1] = args[cnt];
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argv[argc + 1] = NULL;
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#ifdef _WIN32
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sa.nLength = sizeof(SECURITY_ATTRIBUTES);
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sa.bInheritHandle = TRUE;
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sa.lpSecurityDescriptor = NULL;
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if (!CreatePipe(&child_stdout_rd, &child_stdout_wr, &sa, 0))
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{
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g_free(argv[0]);
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Could not create stdout handle");
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return FALSE;
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}
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if (!CreatePipe(&child_stderr_rd, &child_stderr_wr, &sa, 0))
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{
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CloseHandle(child_stdout_rd);
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CloseHandle(child_stdout_wr);
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g_free(argv[0]);
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Could not create stderr handle");
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return FALSE;
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}
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/* convert args array into a single string */
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/* XXX - could change sync_pipe_add_arg() instead */
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/* there is a drawback here: the length is internally limited to 1024 bytes */
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for (cnt = 0; argv[cnt] != 0; cnt++) {
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if (cnt != 0) g_string_append_c(winargs, ' '); /* don't prepend a space before the path!!! */
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quoted_arg = protect_arg(argv[cnt]);
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g_string_append(winargs, quoted_arg);
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g_free(quoted_arg);
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}
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wcommandline = g_utf8_to_utf16(winargs->str, (glong)winargs->len, NULL, NULL, NULL);
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memset(&processInfo, 0, sizeof(PROCESS_INFORMATION));
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memset(&info, 0, sizeof(STARTUPINFO));
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info.cb = sizeof(STARTUPINFO);
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info.hStdError = child_stderr_wr;
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info.hStdOutput = child_stdout_wr;
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info.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
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info.wShowWindow = SW_HIDE;
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if (CreateProcess(NULL, wcommandline, NULL, NULL, TRUE, CREATE_NEW_CONSOLE, NULL, NULL, &info, &processInfo))
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{
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gchar* buffer;
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WaitForSingleObject(processInfo.hProcess, INFINITE);
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buffer = (gchar*)g_malloc(BUFFER_SIZE);
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status = ws_read_string_from_pipe(child_stdout_rd, buffer, BUFFER_SIZE);
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if (status)
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{
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local_output = g_strdup_printf("%s", buffer);
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}
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g_free(buffer);
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CloseHandle(child_stdout_rd);
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CloseHandle(child_stdout_wr);
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CloseHandle(child_stderr_rd);
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CloseHandle(child_stderr_wr);
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CloseHandle(processInfo.hProcess);
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CloseHandle(processInfo.hThread);
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}
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else
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status = FALSE;
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g_setenv("PATH", oldpath, TRUE);
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#else
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status = g_spawn_sync(dirname, argv, NULL,
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(GSpawnFlags) 0, NULL, NULL, &local_output, NULL, &exit_status, NULL);
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if (status && exit_status != 0)
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status = FALSE;
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#endif
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if (status)
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{
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if (command_output != NULL && local_output != NULL)
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*command_output = g_strdup(local_output);
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result = TRUE;
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}
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g_free(local_output);
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g_free(argv[0]);
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g_free(argv);
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return result;
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}
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GPid extcap_spawn_async(extcap_userdata *userdata, GPtrArray *args)
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{
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GPid pid = INVALID_EXTCAP_PID;
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#ifdef _WIN32
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gint cnt = 0;
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gchar **tmp = NULL;
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GString *winargs = g_string_sized_new(200);
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gchar *quoted_arg;
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gunichar2 *wcommandline;
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STARTUPINFO info;
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PROCESS_INFORMATION processInfo;
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SECURITY_ATTRIBUTES sa;
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HANDLE child_stdout_rd = NULL;
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HANDLE child_stdout_wr = NULL;
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HANDLE child_stderr_rd = NULL;
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HANDLE child_stderr_wr = NULL;
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const gchar *oldpath = g_getenv("PATH");
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gchar *newpath = NULL;
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newpath = g_strdup_printf("%s;%s", g_strescape(get_progfile_dir(), NULL), oldpath);
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g_setenv("PATH", newpath, TRUE);
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sa.nLength = sizeof(SECURITY_ATTRIBUTES);
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sa.bInheritHandle = TRUE;
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sa.lpSecurityDescriptor = NULL;
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if (!CreatePipe(&child_stdout_rd, &child_stdout_wr, &sa, 0))
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{
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Could not create stdout handle");
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return FALSE;
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}
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if (!CreatePipe(&child_stderr_rd, &child_stderr_wr, &sa, 0))
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{
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CloseHandle(child_stdout_rd);
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CloseHandle(child_stdout_wr);
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Could not create stderr handle");
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return FALSE;
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}
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/* convert args array into a single string */
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/* XXX - could change sync_pipe_add_arg() instead */
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/* there is a drawback here: the length is internally limited to 1024 bytes */
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for (tmp = (gchar **)args->pdata, cnt = 0; *tmp && **tmp; ++cnt, ++tmp) {
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if (cnt != 0) g_string_append_c(winargs, ' '); /* don't prepend a space before the path!!! */
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quoted_arg = protect_arg(*tmp);
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g_string_append(winargs, quoted_arg);
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g_free(quoted_arg);
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}
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wcommandline = g_utf8_to_utf16(winargs->str, (glong)winargs->len, NULL, NULL, NULL);
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memset(&processInfo, 0, sizeof(PROCESS_INFORMATION));
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memset(&info, 0, sizeof(STARTUPINFO));
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info.cb = sizeof(STARTUPINFO);
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info.hStdError = child_stderr_wr;
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info.hStdOutput = child_stdout_wr;
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info.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW;
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info.wShowWindow = SW_HIDE;
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if (CreateProcess(NULL, wcommandline, NULL, NULL, TRUE, CREATE_NEW_CONSOLE, NULL, NULL, &info, &processInfo))
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{
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userdata->extcap_stderr_rd = _open_osfhandle((intptr_t)(child_stderr_rd), _O_BINARY);
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userdata->extcap_stdout_rd = _open_osfhandle((intptr_t)(child_stdout_rd), _O_BINARY);
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userdata->threadId = processInfo.hThread;
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pid = processInfo.hProcess;
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}
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g_setenv("PATH", oldpath, TRUE);
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#else
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g_spawn_async_with_pipes(NULL, (gchar **)args->pdata, NULL,
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(GSpawnFlags) G_SPAWN_DO_NOT_REAP_CHILD, NULL, NULL,
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&pid, NULL, &userdata->extcap_stdout_rd, &userdata->extcap_stderr_rd, NULL);
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#endif
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userdata->pid = pid;
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return pid;
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}
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#ifdef _WIN32
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typedef struct
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{
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HANDLE pipeHandle;
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OVERLAPPED ol;
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BOOL pendingIO;
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} PIPEINTS;
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gboolean
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extcap_wait_for_pipe(HANDLE * pipe_handles, int num_pipe_handles, HANDLE pid)
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{
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PIPEINTS pipeinsts[3];
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DWORD dw, cbRet;
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HANDLE handles[4];
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int error_code;
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int num_waiting_to_connect = 0;
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int num_handles = num_pipe_handles + 1; // PID handle is also added to list of handles.
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if (num_pipe_handles == 0 || num_pipe_handles > 3)
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{
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Invalid number of pipes given as argument.");
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return FALSE;
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}
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for (int i = 0; i < num_pipe_handles; ++i)
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{
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pipeinsts[i].pipeHandle = pipe_handles[i];
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pipeinsts[i].ol.Pointer = 0;
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pipeinsts[i].ol.hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
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pipeinsts[i].pendingIO = FALSE;
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handles[i] = pipeinsts[i].ol.hEvent;
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BOOL connected = ConnectNamedPipe(pipeinsts[i].pipeHandle, &pipeinsts[i].ol);
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if (connected)
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{
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error_code = GetLastError();
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "ConnectNamedPipe failed with %d \n.", error_code);
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return FALSE;
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}
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switch (GetLastError())
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{
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case ERROR_IO_PENDING:
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num_waiting_to_connect++;
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pipeinsts[i].pendingIO = TRUE;
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break;
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case ERROR_PIPE_CONNECTED:
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if (SetEvent(pipeinsts[i].ol.hEvent))
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{
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break;
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} // Fallthrough if this fails.
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default:
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error_code = GetLastError();
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "ConnectNamedPipe failed with %d \n.", error_code);
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return FALSE;
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}
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}
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// Store pid of extcap process so it can be monitored in case it fails before the pipes has connceted.
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handles[num_pipe_handles] = pid;
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while(num_waiting_to_connect > 0)
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{
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dw = WaitForMultipleObjects(num_handles, handles, FALSE, 30000);
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int idx = dw - WAIT_OBJECT_0;
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if (dw == WAIT_TIMEOUT)
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{
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "extcap didn't connect to pipe within 30 seconds.");
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return FALSE;
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}
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// If index points to our handles array
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else if (idx >= 0 && idx < num_handles)
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{
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if (idx < num_pipe_handles) // Index of pipe handle
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{
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if (pipeinsts[idx].pendingIO)
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{
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BOOL success = GetOverlappedResult(
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pipeinsts[idx].pipeHandle, // handle to pipe
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&pipeinsts[idx].ol, // OVERLAPPED structure
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&cbRet, // bytes transferred
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FALSE); // do not wait
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if (!success)
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{
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Error %d \n.", GetLastError());
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return FALSE;
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}
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else
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{
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pipeinsts[idx].pendingIO = FALSE;
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CloseHandle(pipeinsts[idx].ol.hEvent);
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num_waiting_to_connect--;
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}
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}
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}
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else // Index of PID
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{
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// Fail since index of 'pid' indicates that the pid of the extcap process has terminated.
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "extcap terminated without connecting to pipe.");
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return FALSE;
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}
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}
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else
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{
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "WaitForMultipleObjects returned 0x%08X. Error %d", dw, GetLastError());
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return FALSE;
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}
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}
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return TRUE;
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}
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#endif
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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