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openssh-portable
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Some updates on shell-host.c () 


Create pipe using default buffer size
Update buffer size when read and write file
change to use _wcsnicmp
printed out error when create pipe
added release of the memory
This commit is contained in:
Yanbing 2017-09-27 14:32:30 -07:00 committed by GitHub
parent 8747626b6a
commit afb81c082d
2 changed files with 34 additions and 24 deletions
contrib/win32
openssh
ssh-shellhost.vcxproj
win32compat
shell-host.c

4
contrib/win32/openssh/ssh-shellhost.vcxproj
View File

@ -102,7 +102,7 @@
<ClCompile>
<PrecompiledHeader>
</PrecompiledHeader>
<WarningLevel>Level1</WarningLevel>
<WarningLevel>Level3</WarningLevel>
<Optimization>Disabled</Optimization>
<PreprocessorDefinitions>_WIN32_WINNT=0x600;WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<SDLCheck>false</SDLCheck>
@ -142,7 +142,7 @@
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<ClCompile>
<WarningLevel>Level1</WarningLevel>
<WarningLevel>Level3</WarningLevel>
<PrecompiledHeader>
</PrecompiledHeader>
<Optimization>MaxSpeed</Optimization>

54
contrib/win32/win32compat/shell-host.c
View File

@ -46,6 +46,8 @@
#define MAX_CMD_LEN 8191 // msdn
#define WM_APPEXIT WM_USER+1
#define MAX_EXPECTED_BUFFER_SIZE 1024
/* 4KB is the largest size for which writes are guaranteed to be atomic */
#define BUFF_SIZE 4096
#ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
#define ENABLE_VIRTUAL_TERMINAL_PROCESSING 0x4
@ -1218,7 +1220,7 @@ start_with_pty(wchar_t *command)
HMODULE hm_kernel32 = NULL, hm_user32 = NULL;
wchar_t kernel32_dll_path[PATH_MAX]={0,}, user32_dll_path[PATH_MAX]={0,};
if(cmd == NULL) {
if (cmd == NULL) {
printf_s("ssh-shellhost is out of memory");
exit(255);
}
@ -1278,11 +1280,9 @@ start_with_pty(wchar_t *command)
GOTO_CLEANUP_ON_FALSE(SetHandleInformation(pipe_in, HANDLE_FLAG_INHERIT, 0));
cmd[0] = L'\0';
GOTO_CLEANUP_ON_ERR(wcscat_s(cmd, MAX_CMD_LEN, w32_cmd_path()));
GOTO_CLEANUP_ON_ERR(wcscat_s(cmd, MAX_CMD_LEN, w32_cmd_path()));
if (command) {
GOTO_CLEANUP_ON_ERR(wcscat_s(cmd, MAX_CMD_LEN, L" /c"));
GOTO_CLEANUP_ON_ERR(wcscat_s(cmd, MAX_CMD_LEN, L" "));
GOTO_CLEANUP_ON_ERR(wcscat_s(cmd, MAX_CMD_LEN, L" /c "));
GOTO_CLEANUP_ON_ERR(wcscat_s(cmd, MAX_CMD_LEN, command));
}
@ -1373,18 +1373,17 @@ start_withno_pty(wchar_t *command)
{
STARTUPINFO si;
PROCESS_INFORMATION pi;
wchar_t *cmd = (wchar_t *) malloc(sizeof(wchar_t) * MAX_CMD_LEN);
wchar_t *cmd = (wchar_t *)malloc(sizeof(wchar_t) * MAX_CMD_LEN);
SECURITY_ATTRIBUTES sa;
BOOL ret, process_input = FALSE, run_under_cmd = FALSE;
size_t command_len;
char buf[128];
char *buf = (char *)malloc(BUFF_SIZE + 1);
DWORD rd = 0, wr = 0, i = 0;
if (cmd == NULL) {
printf_s("ssh-shellhost is out of memory");
exit(255);
}
pipe_in = GetStdHandle(STD_INPUT_HANDLE);
pipe_out = GetStdHandle(STD_OUTPUT_HANDLE);
pipe_err = GetStdHandle(STD_ERROR_HANDLE);
@ -1395,8 +1394,11 @@ start_withno_pty(wchar_t *command)
memset(&sa, 0, sizeof(SECURITY_ATTRIBUTES));
sa.bInheritHandle = TRUE;
if (!CreatePipe(&child_pipe_read, &child_pipe_write, &sa, 128))
/* use the default buffer size, 64K*/
if (!CreatePipe(&child_pipe_read, &child_pipe_write, &sa, 0)) {
printf_s("ssh-shellhost-can't open no pty session, error: %d", GetLastError());
return -1;
}
memset(&si, 0, sizeof(STARTUPINFO));
memset(&pi, 0, sizeof(PROCESS_INFORMATION));
@ -1428,10 +1430,10 @@ start_withno_pty(wchar_t *command)
process_input = TRUE;
else {
command_len = wcsnlen_s(command, MAX_CMD_LEN);
if ((command_len >= 3 && wcsncmp(command, L"cmd", 4) == 0) ||
(command_len >= 7 && wcsncmp(command, L"cmd.exe", 8) == 0) ||
(command_len >= 4 && wcsncmp(command, L"cmd ", 4) == 0) ||
(command_len >= 8 && wcsncmp(command, L"cmd.exe ", 8) == 0))
if ((command_len >= 3 && _wcsnicmp(command, L"cmd", 4) == 0) ||
(command_len >= 7 && _wcsnicmp(command, L"cmd.exe", 8) == 0) ||
(command_len >= 4 && _wcsnicmp(command, L"cmd ", 4) == 0) ||
(command_len >= 8 && _wcsnicmp(command, L"cmd.exe ", 8) == 0))
process_input = TRUE;
}
@ -1450,12 +1452,11 @@ start_withno_pty(wchar_t *command)
run_under_cmd = TRUE;
/* if above failed with FILE_NOT_FOUND, try running the provided command under cmd*/
if (run_under_cmd) {
if (run_under_cmd) {
cmd[0] = L'\0';
GOTO_CLEANUP_ON_ERR(wcscat_s(cmd, MAX_CMD_LEN, w32_cmd_path()));
if (command) {
GOTO_CLEANUP_ON_ERR(wcscat_s(cmd, MAX_CMD_LEN, L" /c"));
GOTO_CLEANUP_ON_ERR(wcscat_s(cmd, MAX_CMD_LEN, L" "));
GOTO_CLEANUP_ON_ERR(wcscat_s(cmd, MAX_CMD_LEN, L" /c "));
GOTO_CLEANUP_ON_ERR(wcscat_s(cmd, MAX_CMD_LEN, command));
}
@ -1476,10 +1477,15 @@ start_withno_pty(wchar_t *command)
/* disable Ctrl+C hander in this process*/
SetConsoleCtrlHandler(NULL, TRUE);
if (buf == NULL) {
printf_s("ssh-shellhost is out of memory");
exit(255);
}
/* process data from pipe_in and route appropriately */
while (1) {
rd = wr = i = 0;
GOTO_CLEANUP_ON_FALSE(ReadFile(pipe_in, buf, sizeof(buf)-1, &rd, NULL));
buf[0] = L'\0';
GOTO_CLEANUP_ON_FALSE(ReadFile(pipe_in, buf, BUFF_SIZE, &rd, NULL));
if (process_input == FALSE) {
/* write stream directly to child stdin */
@ -1521,12 +1527,10 @@ start_withno_pty(wchar_t *command)
/* For CR and LF */
if ((buf[i] == '\r') || (buf[i] == '\n')) {
/* TODO - do a much accurate mapping */
GOTO_CLEANUP_ON_FALSE(WriteFile(pipe_out, buf + i, 1, &wr, NULL));
if ((buf[i] == '\r') && ((i == rd - 1) || (buf[i + 1] != '\n'))) {
/* TODO - do a much accurate mapping */
if ((buf[i] == '\r') && ((i == rd - 1) || (buf[i + 1] != '\n')))
buf[i] = '\n';
GOTO_CLEANUP_ON_FALSE(WriteFile(pipe_out, buf + i, 1, &wr, NULL));
}
GOTO_CLEANUP_ON_FALSE(WriteFile(pipe_out, buf + i, 1, &wr, NULL));
in_cmd[in_cmd_len] = buf[i];
in_cmd_len++;
GOTO_CLEANUP_ON_FALSE(WriteFile(child_pipe_write, in_cmd, in_cmd_len, &wr, NULL));
@ -1557,6 +1561,12 @@ cleanup:
}
if (!IS_INVALID_HANDLE(child))
TerminateProcess(child, 0);
if (buf != NULL)
free(buf);
if (cmd != NULL)
free(cmd);
return child_exit_code;
}