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/*
* local-proxy.c: Windows implementation of platform_new_connection(),
* supporting an OpenSSH-like proxy command via the handle-io.c
* mechanism.
*/
#include <stdio.h>
#include <assert.h>
#include "tree234.h"
#include "putty.h"
#include "network.h"
#include "proxy/proxy.h"
char *platform_setup_local_proxy(Socket *socket, const char *cmd)
{
HANDLE us_to_cmd, cmd_from_us;
HANDLE us_from_cmd, cmd_to_us;
HANDLE us_from_cmd_err, cmd_err_to_us;
SECURITY_ATTRIBUTES sa;
STARTUPINFO si;
PROCESS_INFORMATION pi;
/*
* Create the pipes to the proxy command, and spawn the proxy
* command process.
*/
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = NULL; /* default */
sa.bInheritHandle = true;
if (!CreatePipe(&us_from_cmd, &cmd_to_us, &sa, 0)) {
return dupprintf("Unable to create pipes for proxy command: %s",
win_strerror(GetLastError()));
}
if (!CreatePipe(&cmd_from_us, &us_to_cmd, &sa, 0)) {
CloseHandle(us_from_cmd);
CloseHandle(cmd_to_us);
return dupprintf("Unable to create pipes for proxy command: %s",
win_strerror(GetLastError()));
}
if (!CreatePipe(&us_from_cmd_err, &cmd_err_to_us, &sa, 0)) {
CloseHandle(us_from_cmd);
CloseHandle(cmd_to_us);
CloseHandle(us_to_cmd);
CloseHandle(cmd_from_us);
return dupprintf("Unable to create pipes for proxy command: %s",
win_strerror(GetLastError()));
}
SetHandleInformation(us_to_cmd, HANDLE_FLAG_INHERIT, 0);
SetHandleInformation(us_from_cmd, HANDLE_FLAG_INHERIT, 0);
if (us_from_cmd_err != NULL)
SetHandleInformation(us_from_cmd_err, HANDLE_FLAG_INHERIT, 0);
si.cb = sizeof(si);
si.lpReserved = NULL;
si.lpDesktop = NULL;
si.lpTitle = NULL;
si.dwFlags = STARTF_USESTDHANDLES;
si.cbReserved2 = 0;
si.lpReserved2 = NULL;
si.hStdInput = cmd_from_us;
si.hStdOutput = cmd_to_us;
si.hStdError = cmd_err_to_us;
char *cmd_mutable = dupstr(cmd); /* CreateProcess needs non-const char * */
CreateProcess(NULL, cmd_mutable, NULL, NULL, true,
CREATE_NO_WINDOW | NORMAL_PRIORITY_CLASS,
NULL, NULL, &si, &pi);
sfree(cmd_mutable);
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
CloseHandle(cmd_from_us);
CloseHandle(cmd_to_us);
if (cmd_err_to_us != NULL)
CloseHandle(cmd_err_to_us);
setup_handle_socket(socket, us_to_cmd, us_from_cmd, us_from_cmd_err,
false);
return NULL;
}
Socket *platform_new_connection(SockAddr *addr, const char *hostname,
int port, bool privport,
bool oobinline, bool nodelay, bool keepalive,
Plug *plug, Conf *conf, Interactor *itr)
{
if (conf_get_int(conf, CONF_proxy_type) != PROXY_CMD)
return NULL;
DeferredSocketOpener *opener = local_proxy_opener(
addr, port, plug, conf, itr);
Socket *socket = make_deferred_handle_socket(opener, addr, port, plug);
local_proxy_opener_set_socket(opener, socket);
return socket;
}
Socket *platform_start_subprocess(const char *cmd, Plug *plug,
const char *prefix)
{
Socket *socket = make_deferred_handle_socket(
null_deferred_socket_opener(),
sk_nonamelookup("<local command>"), 0, plug);
char *err = platform_setup_local_proxy(socket, cmd);
handle_socket_set_psb_prefix(socket, prefix);
if (err) {
sk_close(socket);
socket = new_error_socket_fmt(plug, "%s", err);
sfree(err);
}
return socket;
}
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