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/*
* Windows support module which deals with being a named-pipe server.
*/
#include <stdio.h>
#include <assert.h>
#define DEFINE_PLUG_METHOD_MACROS
#include "tree234.h"
#include "putty.h"
#include "network.h"
#include "proxy.h"
#include "ssh.h"
#if !defined NO_SECURITY
#include "winsecur.h"
Socket make_handle_socket(HANDLE send_H, HANDLE recv_H, Plug plug,
int overlapped);
typedef struct Socket_named_pipe_server_tag *Named_Pipe_Server_Socket;
struct Socket_named_pipe_server_tag {
const struct socket_function_table *fn;
/* the above variable absolutely *must* be the first in this structure */
/* Parameters for (repeated) creation of named pipe objects */
PSECURITY_DESCRIPTOR psd;
PACL acl;
char *pipename;
/* The current named pipe object + attempt to connect to it */
HANDLE pipehandle;
OVERLAPPED connect_ovl;
/* PuTTY Socket machinery */
Plug plug;
char *error;
};
static Plug sk_namedpipeserver_plug(Socket s, Plug p)
{
Named_Pipe_Server_Socket ps = (Named_Pipe_Server_Socket) s;
Plug ret = ps->plug;
if (p)
ps->plug = p;
return ret;
}
static void sk_namedpipeserver_close(Socket s)
{
Named_Pipe_Server_Socket ps = (Named_Pipe_Server_Socket) s;
CloseHandle(ps->pipehandle);
CloseHandle(ps->connect_ovl.hEvent);
sfree(ps->error);
sfree(ps->pipename);
if (ps->acl)
LocalFree(ps->acl);
if (ps->psd)
LocalFree(ps->psd);
sfree(ps);
}
static const char *sk_namedpipeserver_socket_error(Socket s)
{
Named_Pipe_Server_Socket ps = (Named_Pipe_Server_Socket) s;
return ps->error;
}
static int create_named_pipe(Named_Pipe_Server_Socket ps, int first_instance)
{
SECURITY_ATTRIBUTES sa;
memset(&sa, 0, sizeof(sa));
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = ps->psd;
sa.bInheritHandle = FALSE;
ps->pipehandle = CreateNamedPipe
(/* lpName */
ps->pipename,
/* dwOpenMode */
PIPE_ACCESS_DUPLEX |
FILE_FLAG_OVERLAPPED |
(first_instance ? FILE_FLAG_FIRST_PIPE_INSTANCE : 0),
/* dwPipeMode */
PIPE_TYPE_BYTE | PIPE_READMODE_BYTE | PIPE_WAIT
#ifdef PIPE_REJECT_REMOTE_CLIENTS
| PIPE_REJECT_REMOTE_CLIENTS
#endif
,
/* nMaxInstances */
PIPE_UNLIMITED_INSTANCES,
/* nOutBufferSize, nInBufferSize */
4096, 4096, /* FIXME: think harder about buffer sizes? */
/* nDefaultTimeOut */
0 /* default timeout */,
/* lpSecurityAttributes */
&sa);
return ps->pipehandle != INVALID_HANDLE_VALUE;
}
static Socket named_pipe_accept(accept_ctx_t ctx, Plug plug)
{
HANDLE conn = (HANDLE)ctx.p;
return make_handle_socket(conn, conn, plug, TRUE);
}
/*
* Dummy SockAddr type which just holds a named pipe address. Only
* used for calling plug_log from named_pipe_accept_loop() here.
*/
SockAddr sk_namedpipe_addr(const char *pipename);
static void named_pipe_accept_loop(Named_Pipe_Server_Socket ps,
int got_one_already)
{
while (1) {
int error;
char *errmsg;
if (got_one_already) {
/* If we were called with a connection already waiting,
* skip this step. */
got_one_already = FALSE;
error = 0;
} else {
/*
* Call ConnectNamedPipe, which might succeed or might
* tell us that an overlapped operation is in progress and
* we should wait for our event object.
*/
if (ConnectNamedPipe(ps->pipehandle, &ps->connect_ovl))
error = 0;
else
error = GetLastError();
if (error == ERROR_IO_PENDING)
return;
}
if (error == 0 || error == ERROR_PIPE_CONNECTED) {
/*
* We've successfully retrieved an incoming connection, so
* ps->pipehandle now refers to that connection. So
* convert that handle into a separate connection-type
* Socket, and create a fresh one to be the new listening
* pipe.
*/
HANDLE conn = ps->pipehandle;
accept_ctx_t actx;
actx.p = (void *)conn;
if (plug_accepting(ps->plug, named_pipe_accept, actx)) {
/*
* If the plug didn't want the connection, might as
* well close this handle.
*/
CloseHandle(conn);
}
if (!create_named_pipe(ps, FALSE)) {
error = GetLastError();
} else {
/*
* Go round again to see if more connections can be
* got, or to begin waiting on the event object.
*/
continue;
}
}
errmsg = dupprintf("Error while listening to named pipe: %s",
win_strerror(error));
plug_log(ps->plug, 1, sk_namedpipe_addr(ps->pipename), 0,
errmsg, error);
sfree(errmsg);
break;
}
}
static void named_pipe_connect_callback(void *vps)
{
Named_Pipe_Server_Socket ps = (Named_Pipe_Server_Socket)vps;
named_pipe_accept_loop(ps, TRUE);
}
Socket new_named_pipe_listener(const char *pipename, Plug plug)
{
/*
* This socket type is only used for listening, so it should never
* be asked to write or flush or set_frozen.
*/
static const struct socket_function_table socket_fn_table = {
sk_namedpipeserver_plug,
sk_namedpipeserver_close,
NULL /* write */,
NULL /* write_oob */,
NULL /* write_eof */,
NULL /* flush */,
NULL /* set_frozen */,
sk_namedpipeserver_socket_error
};
Named_Pipe_Server_Socket ret;
ret = snew(struct Socket_named_pipe_server_tag);
ret->fn = &socket_fn_table;
ret->plug = plug;
ret->error = NULL;
ret->psd = NULL;
ret->pipename = dupstr(pipename);
ret->acl = NULL;
assert(strncmp(pipename, "\\\\.\\pipe\\", 9) == 0);
assert(strchr(pipename + 9, '\\') == NULL);
if (!make_private_security_descriptor(GENERIC_READ | GENERIC_WRITE,
&ret->psd, &ret->acl, &ret->error)) {
goto cleanup;
}
if (!create_named_pipe(ret, TRUE)) {
ret->error = dupprintf("unable to create named pipe '%s': %s",
pipename, win_strerror(GetLastError()));
goto cleanup;
}
memset(&ret->connect_ovl, 0, sizeof(ret->connect_ovl));
ret->connect_ovl.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
handle_add_foreign_event(ret->connect_ovl.hEvent,
named_pipe_connect_callback, ret);
named_pipe_accept_loop(ret, FALSE);
cleanup:
return (Socket) ret;
}
#endif /* !defined NO_SECURITY */
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