2 * PLink - a command-line (stdin/stdout) variant of PuTTY.
14 #define PUTTY_DO_GLOBALS /* actually _define_ globals */
19 #define WM_AGENT_CALLBACK (WM_XUSER + 4)
21 #define MAX_STDIN_BACKLOG 4096
23 struct agent_callback
{
24 void (*callback
)(void *, void *, int);
30 void fatalbox(char *p
, ...)
33 fprintf(stderr
, "FATAL ERROR: ");
35 vfprintf(stderr
, p
, ap
);
41 void modalfatalbox(char *p
, ...)
44 fprintf(stderr
, "FATAL ERROR: ");
46 vfprintf(stderr
, p
, ap
);
52 void connection_fatal(void *frontend
, char *p
, ...)
55 fprintf(stderr
, "FATAL ERROR: ");
57 vfprintf(stderr
, p
, ap
);
63 void cmdline_error(char *p
, ...)
66 fprintf(stderr
, "plink: ");
68 vfprintf(stderr
, p
, ap
);
74 HANDLE inhandle
, outhandle
, errhandle
;
75 DWORD orig_console_mode
;
80 static void *backhandle
;
83 int term_ldisc(Terminal
*term
, int mode
)
87 void ldisc_update(void *frontend
, int echo
, int edit
)
89 /* Update stdin read mode to reflect changes in line discipline. */
92 mode
= ENABLE_PROCESSED_INPUT
;
94 mode
= mode
| ENABLE_ECHO_INPUT
;
96 mode
= mode
& ~ENABLE_ECHO_INPUT
;
98 mode
= mode
| ENABLE_LINE_INPUT
;
100 mode
= mode
& ~ENABLE_LINE_INPUT
;
101 SetConsoleMode(inhandle
, mode
);
107 HANDLE event
, eventback
;
110 static DWORD WINAPI
stdin_read_thread(void *param
)
112 struct input_data
*idata
= (struct input_data
*) param
;
115 inhandle
= GetStdHandle(STD_INPUT_HANDLE
);
117 while (ReadFile(inhandle
, idata
->buffer
, sizeof(idata
->buffer
),
118 &idata
->len
, NULL
) && idata
->len
> 0) {
119 SetEvent(idata
->event
);
120 WaitForSingleObject(idata
->eventback
, INFINITE
);
124 SetEvent(idata
->event
);
130 DWORD len
, lenwritten
;
134 HANDLE event
, eventback
;
138 static DWORD WINAPI
stdout_write_thread(void *param
)
140 struct output_data
*odata
= (struct output_data
*) param
;
141 HANDLE outhandle
, errhandle
;
143 outhandle
= GetStdHandle(STD_OUTPUT_HANDLE
);
144 errhandle
= GetStdHandle(STD_ERROR_HANDLE
);
147 WaitForSingleObject(odata
->eventback
, INFINITE
);
151 WriteFile(odata
->is_stderr ? errhandle
: outhandle
,
152 odata
->buffer
, odata
->len
, &odata
->lenwritten
, NULL
);
153 SetEvent(odata
->event
);
159 bufchain stdout_data
, stderr_data
;
160 struct output_data odata
, edata
;
162 void try_output(int is_stderr
)
164 struct output_data
*data
= (is_stderr ?
&edata
: &odata
);
169 bufchain_prefix(is_stderr ?
&stderr_data
: &stdout_data
,
170 &senddata
, &sendlen
);
171 data
->buffer
= senddata
;
173 SetEvent(data
->eventback
);
178 int from_backend(void *frontend_handle
, int is_stderr
,
179 const char *data
, int len
)
184 bufchain_add(&stderr_data
, data
, len
);
187 bufchain_add(&stdout_data
, data
, len
);
191 osize
= bufchain_size(&stdout_data
);
192 esize
= bufchain_size(&stderr_data
);
194 return osize
+ esize
;
197 static DWORD main_thread_id
;
199 void agent_schedule_callback(void (*callback
)(void *, void *, int),
200 void *callback_ctx
, void *data
, int len
)
202 struct agent_callback
*c
= snew(struct agent_callback
);
203 c
->callback
= callback
;
204 c
->callback_ctx
= callback_ctx
;
207 PostThreadMessage(main_thread_id
, WM_AGENT_CALLBACK
, 0, (LPARAM
)c
);
211 * Short description of parameters.
213 static void usage(void)
215 printf("PuTTY Link: command-line connection utility\n");
217 printf("Usage: plink [options] [user@]host [command]\n");
218 printf(" (\"host\" can also be a PuTTY saved session name)\n");
219 printf("Options:\n");
220 printf(" -v show verbose messages\n");
221 printf(" -load sessname Load settings from saved session\n");
222 printf(" -ssh -telnet -rlogin -raw\n");
223 printf(" force use of a particular protocol (default SSH)\n");
224 printf(" -P port connect to specified port\n");
225 printf(" -l user connect with specified username\n");
226 printf(" -m file read remote command(s) from file\n");
227 printf(" -batch disable all interactive prompts\n");
228 printf("The following options only apply to SSH connections:\n");
229 printf(" -pw passw login with specified password\n");
230 printf(" -D listen-port Dynamic SOCKS-based port forwarding\n");
231 printf(" -L listen-port:host:port Forward local port to "
233 printf(" -R listen-port:host:port Forward remote port to"
235 printf(" -X -x enable / disable X11 forwarding\n");
236 printf(" -A -a enable / disable agent forwarding\n");
237 printf(" -t -T enable / disable pty allocation\n");
238 printf(" -1 -2 force use of particular protocol version\n");
239 printf(" -C enable compression\n");
240 printf(" -i key private key file for authentication\n");
241 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
245 char *do_select(SOCKET skt
, int startup
)
249 events
= (FD_CONNECT
| FD_READ
| FD_WRITE
|
250 FD_OOB
| FD_CLOSE
| FD_ACCEPT
);
254 if (WSAEventSelect(skt
, netevent
, events
) == SOCKET_ERROR
) {
255 switch (WSAGetLastError()) {
257 return "Network is down";
259 return "WSAAsyncSelect(): unknown error";
265 int main(int argc
, char **argv
)
269 WSAEVENT stdinevent
, stdoutevent
, stderrevent
;
271 DWORD in_threadid
, out_threadid
, err_threadid
;
272 struct input_data idata
;
281 int use_subsystem
= 0;
283 ssh_get_line
= console_get_line
;
286 skcount
= sksize
= 0;
288 * Initialise port and protocol to sensible defaults. (These
289 * will be overridden by more or less anything.)
291 default_protocol
= PROT_SSH
;
296 * Process the command line.
298 do_defaults(NULL
, &cfg
);
299 default_protocol
= cfg
.protocol
;
300 default_port
= cfg
.port
;
304 * Override the default protocol if PLINK_PROTOCOL is set.
306 char *p
= getenv("PLINK_PROTOCOL");
309 for (i
= 0; backends
[i
].backend
!= NULL
; i
++) {
310 if (!strcmp(backends
[i
].name
, p
)) {
311 default_protocol
= cfg
.protocol
= backends
[i
].protocol
;
312 default_port
= cfg
.port
=
313 backends
[i
].backend
->default_port
;
322 int ret
= cmdline_process_param(p
, (argc
> 1 ? argv
[1] : NULL
),
326 "plink: option \"%s\" requires an argument\n", p
);
328 } else if (ret
== 2) {
330 } else if (ret
== 1) {
332 } else if (!strcmp(p
, "-batch")) {
333 console_batch_mode
= 1;
334 } else if (!strcmp(p
, "-s")) {
335 /* Save status to write to cfg later. */
338 fprintf(stderr
, "plink: unknown option \"%s\"\n", p
);
345 * If the hostname starts with "telnet:", set the
346 * protocol to Telnet and process the string as a
349 if (!strncmp(q
, "telnet:", 7)) {
353 if (q
[0] == '/' && q
[1] == '/')
355 cfg
.protocol
= PROT_TELNET
;
357 while (*p
&& *p
!= ':' && *p
!= '/')
366 strncpy(cfg
.host
, q
, sizeof(cfg
.host
) - 1);
367 cfg
.host
[sizeof(cfg
.host
) - 1] = '\0';
371 * Before we process the [user@]host string, we
372 * first check for the presence of a protocol
373 * prefix (a protocol name followed by ",").
378 for (i
= 0; backends
[i
].backend
!= NULL
; i
++) {
379 j
= strlen(backends
[i
].name
);
381 !memcmp(backends
[i
].name
, p
, j
)) {
382 default_protocol
= cfg
.protocol
=
383 backends
[i
].protocol
;
385 backends
[i
].backend
->default_port
;
393 * Three cases. Either (a) there's a nonzero
394 * length string followed by an @, in which
395 * case that's user and the remainder is host.
396 * Or (b) there's only one string, not counting
397 * a potential initial @, and it exists in the
398 * saved-sessions database. Or (c) only one
399 * string and it _doesn't_ exist in the
404 p
++, r
= NULL
; /* discount initial @ */
410 do_defaults(p
, &cfg2
);
411 if (cfg2
.host
[0] == '\0') {
412 /* No settings for this host; use defaults */
413 strncpy(cfg
.host
, p
, sizeof(cfg
.host
) - 1);
414 cfg
.host
[sizeof(cfg
.host
) - 1] = '\0';
415 cfg
.port
= default_port
;
418 cfg
.remote_cmd_ptr
= cfg
.remote_cmd
;
422 strncpy(cfg
.username
, p
, sizeof(cfg
.username
) - 1);
423 cfg
.username
[sizeof(cfg
.username
) - 1] = '\0';
424 strncpy(cfg
.host
, r
, sizeof(cfg
.host
) - 1);
425 cfg
.host
[sizeof(cfg
.host
) - 1] = '\0';
426 cfg
.port
= default_port
;
432 cmdlen
= cmdsize
= 0;
437 if (cmdlen
>= cmdsize
) {
438 cmdsize
= cmdlen
+ 512;
439 command
= sresize(command
, cmdsize
, char);
441 command
[cmdlen
++]=*p
++;
443 if (cmdlen
>= cmdsize
) {
444 cmdsize
= cmdlen
+ 512;
445 command
= sresize(command
, cmdsize
, char);
447 command
[cmdlen
++]=' '; /* always add trailing space */
448 if (--argc
) p
= *++argv
;
450 if (cmdlen
) command
[--cmdlen
]='\0';
451 /* change trailing blank to NUL */
452 cfg
.remote_cmd_ptr
= command
;
453 cfg
.remote_cmd_ptr2
= NULL
;
454 cfg
.nopty
= TRUE
; /* command => no terminal */
456 break; /* done with cmdline */
469 * Trim leading whitespace off the hostname if it's there.
472 int space
= strspn(cfg
.host
, " \t");
473 memmove(cfg
.host
, cfg
.host
+space
, 1+strlen(cfg
.host
)-space
);
476 /* See if host is of the form user@host */
477 if (cfg
.host
[0] != '\0') {
478 char *atsign
= strchr(cfg
.host
, '@');
479 /* Make sure we're not overflowing the user field */
481 if (atsign
- cfg
.host
< sizeof cfg
.username
) {
482 strncpy(cfg
.username
, cfg
.host
, atsign
- cfg
.host
);
483 cfg
.username
[atsign
- cfg
.host
] = '\0';
485 memmove(cfg
.host
, atsign
+ 1, 1 + strlen(atsign
+ 1));
490 * Perform command-line overrides on session configuration.
492 cmdline_run_saved(&cfg
);
495 * Apply subsystem status.
498 cfg
.ssh_subsys
= TRUE
;
501 * Trim a colon suffix off the hostname if it's there.
503 cfg
.host
[strcspn(cfg
.host
, ":")] = '\0';
506 * Remove any remaining whitespace from the hostname.
510 while (cfg
.host
[p2
] != '\0') {
511 if (cfg
.host
[p2
] != ' ' && cfg
.host
[p2
] != '\t') {
512 cfg
.host
[p1
] = cfg
.host
[p2
];
520 if (!*cfg
.remote_cmd_ptr
)
521 flags
|= FLAG_INTERACTIVE
;
524 * Select protocol. This is farmed out into a table in a
525 * separate file to enable an ssh-free variant.
530 for (i
= 0; backends
[i
].backend
!= NULL
; i
++)
531 if (backends
[i
].protocol
== cfg
.protocol
) {
532 back
= backends
[i
].backend
;
537 "Internal fault: Unsupported protocol found\n");
545 if (portnumber
!= -1)
546 cfg
.port
= portnumber
;
549 * Initialise WinSock.
551 winsock_ver
= MAKEWORD(2, 0);
552 if (WSAStartup(winsock_ver
, &wsadata
)) {
553 MessageBox(NULL
, "Unable to initialise WinSock", "WinSock Error",
554 MB_OK
| MB_ICONEXCLAMATION
);
557 if (LOBYTE(wsadata
.wVersion
) != 2 || HIBYTE(wsadata
.wVersion
) != 0) {
558 MessageBox(NULL
, "WinSock version is incompatible with 2.0",
559 "WinSock Error", MB_OK
| MB_ICONEXCLAMATION
);
566 * Start up the connection.
568 netevent
= CreateEvent(NULL
, FALSE
, FALSE
, NULL
);
572 /* nodelay is only useful if stdin is a character device (console) */
573 int nodelay
= cfg
.tcp_nodelay
&&
574 (GetFileType(GetStdHandle(STD_INPUT_HANDLE
)) == FILE_TYPE_CHAR
);
576 error
= back
->init(NULL
, &backhandle
, &cfg
, cfg
.host
, cfg
.port
,
579 fprintf(stderr
, "Unable to open connection:\n%s", error
);
582 logctx
= log_init(NULL
, &cfg
);
583 back
->provide_logctx(backhandle
, logctx
);
584 console_provide_logctx(logctx
);
589 stdinevent
= CreateEvent(NULL
, FALSE
, FALSE
, NULL
);
590 stdoutevent
= CreateEvent(NULL
, FALSE
, FALSE
, NULL
);
591 stderrevent
= CreateEvent(NULL
, FALSE
, FALSE
, NULL
);
593 inhandle
= GetStdHandle(STD_INPUT_HANDLE
);
594 outhandle
= GetStdHandle(STD_OUTPUT_HANDLE
);
595 errhandle
= GetStdHandle(STD_ERROR_HANDLE
);
596 GetConsoleMode(inhandle
, &orig_console_mode
);
597 SetConsoleMode(inhandle
, ENABLE_PROCESSED_INPUT
);
599 main_thread_id
= GetCurrentThreadId();
602 * Turn off ECHO and LINE input modes. We don't care if this
603 * call fails, because we know we aren't necessarily running in
606 handles
[0] = netevent
;
607 handles
[1] = stdinevent
;
608 handles
[2] = stdoutevent
;
609 handles
[3] = stderrevent
;
613 * Create spare threads to write to stdout and stderr, so we
614 * can arrange asynchronous writes.
616 odata
.event
= stdoutevent
;
617 odata
.eventback
= CreateEvent(NULL
, FALSE
, FALSE
, NULL
);
619 odata
.busy
= odata
.done
= 0;
620 if (!CreateThread(NULL
, 0, stdout_write_thread
,
621 &odata
, 0, &out_threadid
)) {
622 fprintf(stderr
, "Unable to create output thread\n");
625 edata
.event
= stderrevent
;
626 edata
.eventback
= CreateEvent(NULL
, FALSE
, FALSE
, NULL
);
628 edata
.busy
= edata
.done
= 0;
629 if (!CreateThread(NULL
, 0, stdout_write_thread
,
630 &edata
, 0, &err_threadid
)) {
631 fprintf(stderr
, "Unable to create error output thread\n");
638 if (!sending
&& back
->sendok(backhandle
)) {
640 * Create a separate thread to read from stdin. This is
641 * a total pain, but I can't find another way to do it:
643 * - an overlapped ReadFile or ReadFileEx just doesn't
644 * happen; we get failure from ReadFileEx, and
645 * ReadFile blocks despite being given an OVERLAPPED
646 * structure. Perhaps we can't do overlapped reads
647 * on consoles. WHY THE HELL NOT?
649 * - WaitForMultipleObjects(netevent, console) doesn't
650 * work, because it signals the console when
651 * _anything_ happens, including mouse motions and
652 * other things that don't cause data to be readable
653 * - so we're back to ReadFile blocking.
655 idata
.event
= stdinevent
;
656 idata
.eventback
= CreateEvent(NULL
, FALSE
, FALSE
, NULL
);
657 if (!CreateThread(NULL
, 0, stdin_read_thread
,
658 &idata
, 0, &in_threadid
)) {
659 fprintf(stderr
, "Unable to create input thread\n");
665 n
= MsgWaitForMultipleObjects(4, handles
, FALSE
, INFINITE
,
668 WSANETWORKEVENTS things
;
670 extern SOCKET
first_socket(int *), next_socket(int *);
671 extern int select_result(WPARAM
, LPARAM
);
675 * We must not call select_result() for any socket
676 * until we have finished enumerating within the tree.
677 * This is because select_result() may close the socket
678 * and modify the tree.
680 /* Count the active sockets. */
682 for (socket
= first_socket(&socketstate
);
683 socket
!= INVALID_SOCKET
;
684 socket
= next_socket(&socketstate
)) i
++;
686 /* Expand the buffer if necessary. */
689 sklist
= sresize(sklist
, sksize
, SOCKET
);
692 /* Retrieve the sockets into sklist. */
694 for (socket
= first_socket(&socketstate
);
695 socket
!= INVALID_SOCKET
;
696 socket
= next_socket(&socketstate
)) {
697 sklist
[skcount
++] = socket
;
700 /* Now we're done enumerating; go through the list. */
701 for (i
= 0; i
< skcount
; i
++) {
704 wp
= (WPARAM
) socket
;
705 if (!WSAEnumNetworkEvents(socket
, NULL
, &things
)) {
706 static const struct { int bit
, mask
; } eventtypes
[] = {
707 {FD_CONNECT_BIT
, FD_CONNECT
},
708 {FD_READ_BIT
, FD_READ
},
709 {FD_CLOSE_BIT
, FD_CLOSE
},
710 {FD_OOB_BIT
, FD_OOB
},
711 {FD_WRITE_BIT
, FD_WRITE
},
712 {FD_ACCEPT_BIT
, FD_ACCEPT
},
716 noise_ultralight(socket
);
717 noise_ultralight(things
.lNetworkEvents
);
719 for (e
= 0; e
< lenof(eventtypes
); e
++)
720 if (things
.lNetworkEvents
& eventtypes
[e
].mask
) {
722 int err
= things
.iErrorCode
[eventtypes
[e
].bit
];
723 lp
= WSAMAKESELECTREPLY(eventtypes
[e
].mask
, err
);
724 connopen
&= select_result(wp
, lp
);
730 noise_ultralight(idata
.len
);
731 if (connopen
&& back
->socket(backhandle
) != NULL
) {
733 back
->send(backhandle
, idata
.buffer
, idata
.len
);
735 back
->special(backhandle
, TS_EOF
);
740 if (!odata
.writeret
) {
741 fprintf(stderr
, "Unable to write to standard output\n");
744 bufchain_consume(&stdout_data
, odata
.lenwritten
);
745 if (bufchain_size(&stdout_data
) > 0)
747 if (connopen
&& back
->socket(backhandle
) != NULL
) {
748 back
->unthrottle(backhandle
, bufchain_size(&stdout_data
) +
749 bufchain_size(&stderr_data
));
753 if (!edata
.writeret
) {
754 fprintf(stderr
, "Unable to write to standard output\n");
757 bufchain_consume(&stderr_data
, edata
.lenwritten
);
758 if (bufchain_size(&stderr_data
) > 0)
760 if (connopen
&& back
->socket(backhandle
) != NULL
) {
761 back
->unthrottle(backhandle
, bufchain_size(&stdout_data
) +
762 bufchain_size(&stderr_data
));
766 while (PeekMessage(&msg
, INVALID_HANDLE_VALUE
,
767 WM_AGENT_CALLBACK
, WM_AGENT_CALLBACK
,
769 struct agent_callback
*c
= (struct agent_callback
*)msg
.lParam
;
770 c
->callback(c
->callback_ctx
, c
->data
, c
->len
);
774 if (!reading
&& back
->sendbuffer(backhandle
) < MAX_STDIN_BACKLOG
) {
775 SetEvent(idata
.eventback
);
778 if ((!connopen
|| back
->socket(backhandle
) == NULL
) &&
779 bufchain_size(&stdout_data
) == 0 &&
780 bufchain_size(&stderr_data
) == 0)
781 break; /* we closed the connection */
784 exitcode
= back
->exitcode(backhandle
);
786 fprintf(stderr
, "Remote process exit code unavailable\n");
787 exitcode
= 1; /* this is an error condition */