Support for Windows PuTTY connecting straight to a local serial port

[u/mdw/putty] / windows / winproxy.c

/*\r
 * winproxy.c: Windows implementation of platform_new_connection(),\r
 * supporting an OpenSSH-like proxy command via the winhandl.c\r
 * mechanism.\r
 */\r
\r
#include <stdio.h>\r
#include <assert.h>\r
\r
#define DEFINE_PLUG_METHOD_MACROS\r
#include "tree234.h"\r
#include "putty.h"\r
#include "network.h"\r
#include "proxy.h"\r
\r
typedef struct Socket_localproxy_tag *Local_Proxy_Socket;\r
\r
struct Socket_localproxy_tag {\r
    const struct socket_function_table *fn;\r
    /* the above variable absolutely *must* be the first in this structure */\r
\r
    HANDLE to_cmd_H, from_cmd_H;\r
    struct handle *to_cmd_h, *from_cmd_h;\r
\r
    char *error;\r
\r
    Plug plug;\r
\r
    void *privptr;\r
};\r
\r
int localproxy_gotdata(struct handle *h, void *data, int len)\r
{\r
    Local_Proxy_Socket ps = (Local_Proxy_Socket) handle_get_privdata(h);\r
\r
    if (len < 0) {\r
	return plug_closing(ps->plug, "Read error from local proxy command",\r
			    0, 0);\r
    } else if (len == 0) {\r
	return plug_closing(ps->plug, NULL, 0, 0);\r
    } else {\r
	return plug_receive(ps->plug, 1, data, len);\r
    }\r
}\r
\r
void localproxy_sentdata(struct handle *h, int new_backlog)\r
{\r
    Local_Proxy_Socket ps = (Local_Proxy_Socket) handle_get_privdata(h);\r
    \r
    plug_sent(ps->plug, new_backlog);\r
}\r
\r
static Plug sk_localproxy_plug (Socket s, Plug p)\r
{\r
    Local_Proxy_Socket ps = (Local_Proxy_Socket) s;\r
    Plug ret = ps->plug;\r
    if (p)\r
	ps->plug = p;\r
    return ret;\r
}\r
\r
static void sk_localproxy_close (Socket s)\r
{\r
    Local_Proxy_Socket ps = (Local_Proxy_Socket) s;\r
\r
    handle_free(ps->to_cmd_h);\r
    handle_free(ps->from_cmd_h);\r
    CloseHandle(ps->to_cmd_H);\r
    CloseHandle(ps->from_cmd_H);\r
\r
    sfree(ps);\r
}\r
\r
static int sk_localproxy_write (Socket s, const char *data, int len)\r
{\r
    Local_Proxy_Socket ps = (Local_Proxy_Socket) s;\r
\r
    return handle_write(ps->to_cmd_h, data, len);\r
}\r
\r
static int sk_localproxy_write_oob(Socket s, const char *data, int len)\r
{\r
    /*\r
     * oob data is treated as inband; nasty, but nothing really\r
     * better we can do\r
     */\r
    return sk_localproxy_write(s, data, len);\r
}\r
\r
static void sk_localproxy_flush(Socket s)\r
{\r
    /* Local_Proxy_Socket ps = (Local_Proxy_Socket) s; */\r
    /* do nothing */\r
}\r
\r
static void sk_localproxy_set_private_ptr(Socket s, void *ptr)\r
{\r
    Local_Proxy_Socket ps = (Local_Proxy_Socket) s;\r
    ps->privptr = ptr;\r
}\r
\r
static void *sk_localproxy_get_private_ptr(Socket s)\r
{\r
    Local_Proxy_Socket ps = (Local_Proxy_Socket) s;\r
    return ps->privptr;\r
}\r
\r
static void sk_localproxy_set_frozen(Socket s, int is_frozen)\r
{\r
    Local_Proxy_Socket ps = (Local_Proxy_Socket) s;\r
\r
    /*\r
     * FIXME\r
     */\r
}\r
\r
static const char *sk_localproxy_socket_error(Socket s)\r
{\r
    Local_Proxy_Socket ps = (Local_Proxy_Socket) s;\r
    return ps->error;\r
}\r
\r
Socket platform_new_connection(SockAddr addr, char *hostname,\r
			       int port, int privport,\r
			       int oobinline, int nodelay, int keepalive,\r
			       Plug plug, const Config *cfg)\r
{\r
    char *cmd;\r
\r
    static const struct socket_function_table socket_fn_table = {\r
	sk_localproxy_plug,\r
	sk_localproxy_close,\r
	sk_localproxy_write,\r
	sk_localproxy_write_oob,\r
	sk_localproxy_flush,\r
	sk_localproxy_set_private_ptr,\r
	sk_localproxy_get_private_ptr,\r
	sk_localproxy_set_frozen,\r
	sk_localproxy_socket_error\r
    };\r
\r
    Local_Proxy_Socket ret;\r
    HANDLE us_to_cmd, us_from_cmd, cmd_to_us, cmd_from_us;\r
    SECURITY_ATTRIBUTES sa;\r
    STARTUPINFO si;\r
    PROCESS_INFORMATION pi;\r
\r
    if (cfg->proxy_type != PROXY_CMD)\r
	return NULL;\r
\r
    cmd = format_telnet_command(addr, port, cfg);\r
\r
    {\r
	char *msg = dupprintf("Starting local proxy command: %s", cmd);\r
	/* We're allowed to pass NULL here, because we're part of the Windows\r
	 * front end so we know logevent doesn't expect any data. */\r
	logevent(NULL, msg);\r
	sfree(msg);\r
    }\r
\r
    ret = snew(struct Socket_localproxy_tag);\r
    ret->fn = &socket_fn_table;\r
    ret->plug = plug;\r
    ret->error = NULL;\r
\r
    /*\r
     * Create the pipes to the proxy command, and spawn the proxy\r
     * command process.\r
     */\r
    sa.nLength = sizeof(sa);\r
    sa.lpSecurityDescriptor = NULL;    /* default */\r
    sa.bInheritHandle = TRUE;\r
    if (!CreatePipe(&us_from_cmd, &cmd_to_us, &sa, 0)) {\r
	ret->error = dupprintf("Unable to create pipes for proxy command");\r
	return (Socket)ret;\r
    }\r
\r
    if (!CreatePipe(&cmd_from_us, &us_to_cmd, &sa, 0)) {\r
	CloseHandle(us_from_cmd);\r
	CloseHandle(cmd_to_us);\r
	ret->error = dupprintf("Unable to create pipes for proxy command");\r
	return (Socket)ret;\r
    }\r
\r
    SetHandleInformation(us_to_cmd, HANDLE_FLAG_INHERIT, 0);\r
    SetHandleInformation(us_from_cmd, HANDLE_FLAG_INHERIT, 0);\r
\r
    si.cb = sizeof(si);\r
    si.lpReserved = NULL;\r
    si.lpDesktop = NULL;\r
    si.lpTitle = NULL;\r
    si.dwFlags = STARTF_USESTDHANDLES;\r
    si.cbReserved2 = 0;\r
    si.lpReserved2 = NULL;\r
    si.hStdInput = cmd_from_us;\r
    si.hStdOutput = cmd_to_us;\r
    si.hStdError = NULL;\r
    CreateProcess(NULL, cmd, NULL, NULL, TRUE,\r
		  CREATE_NO_WINDOW | NORMAL_PRIORITY_CLASS,\r
		  NULL, NULL, &si, &pi);\r
\r
    CloseHandle(cmd_from_us);\r
    CloseHandle(cmd_to_us);\r
\r
    ret->to_cmd_H = us_to_cmd;\r
    ret->from_cmd_H = us_from_cmd;\r
\r
    ret->from_cmd_h = handle_input_new(ret->from_cmd_H, localproxy_gotdata,\r
				       ret, 0);\r
    ret->to_cmd_h = handle_output_new(ret->to_cmd_H, localproxy_sentdata,\r
				      ret, 0);\r
\r
    /* We are responsible for this and don't need it any more */\r
    sk_addr_free(addr);\r
\r
    return (Socket) ret;\r
}\r