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)
186 bufchain_add(&stderr_data, data, len);
189 bufchain_add(&stdout_data, data, len);
193 osize = bufchain_size(&stdout_data);
194 esize = bufchain_size(&stderr_data);
196 return osize + esize;
199 static DWORD main_thread_id;
201 void agent_schedule_callback(void (*callback)(void *, void *, int),
202 void *callback_ctx, void *data, int len)
204 struct agent_callback *c = snew(struct agent_callback);
205 c->callback = callback;
206 c->callback_ctx = callback_ctx;
209 PostThreadMessage(main_thread_id, WM_AGENT_CALLBACK, 0, (LPARAM)c);
213 * Short description of parameters.
215 static void usage(void)
217 printf("PuTTY Link: command-line connection utility\n");
219 printf("Usage: plink [options] [user@]host [command]\n");
220 printf(" (\"host\" can also be a PuTTY saved session name)\n");
221 printf("Options:\n");
222 printf(" -v show verbose messages\n");
223 printf(" -load sessname Load settings from saved session\n");
224 printf(" -ssh -telnet -rlogin -raw\n");
225 printf(" force use of a particular protocol (default SSH)\n");
226 printf(" -P port connect to specified port\n");
227 printf(" -l user connect with specified username\n");
228 printf(" -m file read remote command(s) from file\n");
229 printf(" -batch disable all interactive prompts\n");
230 printf("The following options only apply to SSH connections:\n");
231 printf(" -pw passw login with specified password\n");
232 printf(" -D listen-port Dynamic SOCKS-based port forwarding\n");
233 printf(" -L listen-port:host:port Forward local port to "
235 printf(" -R listen-port:host:port Forward remote port to"
237 printf(" -X -x enable / disable X11 forwarding\n");
238 printf(" -A -a enable / disable agent forwarding\n");
239 printf(" -t -T enable / disable pty allocation\n");
240 printf(" -1 -2 force use of particular protocol version\n");
241 printf(" -C enable compression\n");
242 printf(" -i key private key file for authentication\n");
246 char *do_select(SOCKET skt, int startup)
250 events = (FD_CONNECT | FD_READ | FD_WRITE |
251 FD_OOB | FD_CLOSE | FD_ACCEPT);
255 if (WSAEventSelect(skt, netevent, events) == SOCKET_ERROR) {
256 switch (WSAGetLastError()) {
258 return "Network is down";
260 return "WSAAsyncSelect(): unknown error";
266 int main(int argc, char **argv)
270 WSAEVENT stdinevent, stdoutevent, stderrevent;
272 DWORD in_threadid, out_threadid, err_threadid;
273 struct input_data idata;
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;
335 fprintf(stderr, "plink: unknown option \"%s\"\n", p);
342 * If the hostname starts with "telnet:", set the
343 * protocol to Telnet and process the string as a
346 if (!strncmp(q, "telnet:", 7)) {
350 if (q[0] == '/' && q[1] == '/')
352 cfg.protocol = PROT_TELNET;
354 while (*p && *p != ':' && *p != '/')
363 strncpy(cfg.host, q, sizeof(cfg.host) - 1);
364 cfg.host[sizeof(cfg.host) - 1] = '\0';
368 * Before we process the [user@]host string, we
369 * first check for the presence of a protocol
370 * prefix (a protocol name followed by ",").
375 for (i = 0; backends[i].backend != NULL; i++) {
376 j = strlen(backends[i].name);
378 !memcmp(backends[i].name, p, j)) {
379 default_protocol = cfg.protocol =
380 backends[i].protocol;
382 backends[i].backend->default_port;
390 * Three cases. Either (a) there's a nonzero
391 * length string followed by an @, in which
392 * case that's user and the remainder is host.
393 * Or (b) there's only one string, not counting
394 * a potential initial @, and it exists in the
395 * saved-sessions database. Or (c) only one
396 * string and it _doesn't_ exist in the
401 p++, r = NULL; /* discount initial @ */
407 do_defaults(p, &cfg2);
408 if (cfg2.host[0] == '\0') {
409 /* No settings for this host; use defaults */
410 strncpy(cfg.host, p, sizeof(cfg.host) - 1);
411 cfg.host[sizeof(cfg.host) - 1] = '\0';
412 cfg.port = default_port;
415 cfg.remote_cmd_ptr = cfg.remote_cmd;
419 strncpy(cfg.username, p, sizeof(cfg.username) - 1);
420 cfg.username[sizeof(cfg.username) - 1] = '\0';
421 strncpy(cfg.host, r, sizeof(cfg.host) - 1);
422 cfg.host[sizeof(cfg.host) - 1] = '\0';
423 cfg.port = default_port;
429 cmdlen = cmdsize = 0;
434 if (cmdlen >= cmdsize) {
435 cmdsize = cmdlen + 512;
436 command = sresize(command, cmdsize, char);
438 command[cmdlen++]=*p++;
440 if (cmdlen >= cmdsize) {
441 cmdsize = cmdlen + 512;
442 command = sresize(command, cmdsize, char);
444 command[cmdlen++]=' '; /* always add trailing space */
445 if (--argc) p = *++argv;
447 if (cmdlen) command[--cmdlen]='\0';
448 /* change trailing blank to NUL */
449 cfg.remote_cmd_ptr = command;
450 cfg.remote_cmd_ptr2 = NULL;
451 cfg.nopty = TRUE; /* command => no terminal */
453 break; /* done with cmdline */
466 * Trim leading whitespace off the hostname if it's there.
469 int space = strspn(cfg.host, " \t");
470 memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
473 /* See if host is of the form user@host */
474 if (cfg.host[0] != '\0') {
475 char *atsign = strchr(cfg.host, '@');
476 /* Make sure we're not overflowing the user field */
478 if (atsign - cfg.host < sizeof cfg.username) {
479 strncpy(cfg.username, cfg.host, atsign - cfg.host);
480 cfg.username[atsign - cfg.host] = '\0';
482 memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
487 * Perform command-line overrides on session configuration.
489 cmdline_run_saved(&cfg);
492 * Trim a colon suffix off the hostname if it's there.
494 cfg.host[strcspn(cfg.host, ":")] = '\0';
497 * Remove any remaining whitespace from the hostname.
501 while (cfg.host[p2] != '\0') {
502 if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
503 cfg.host[p1] = cfg.host[p2];
511 if (!*cfg.remote_cmd_ptr)
512 flags |= FLAG_INTERACTIVE;
515 * Select protocol. This is farmed out into a table in a
516 * separate file to enable an ssh-free variant.
521 for (i = 0; backends[i].backend != NULL; i++)
522 if (backends[i].protocol == cfg.protocol) {
523 back = backends[i].backend;
528 "Internal fault: Unsupported protocol found\n");
536 if (portnumber != -1)
537 cfg.port = portnumber;
540 * Initialise WinSock.
542 winsock_ver = MAKEWORD(2, 0);
543 if (WSAStartup(winsock_ver, &wsadata)) {
544 MessageBox(NULL, "Unable to initialise WinSock", "WinSock Error",
545 MB_OK | MB_ICONEXCLAMATION);
548 if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wVersion) != 0) {
549 MessageBox(NULL, "WinSock version is incompatible with 2.0",
550 "WinSock Error", MB_OK | MB_ICONEXCLAMATION);
557 * Start up the connection.
559 netevent = CreateEvent(NULL, FALSE, FALSE, NULL);
563 /* nodelay is only useful if stdin is a character device (console) */
564 int nodelay = cfg.tcp_nodelay &&
565 (GetFileType(GetStdHandle(STD_INPUT_HANDLE)) == FILE_TYPE_CHAR);
567 error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
570 fprintf(stderr, "Unable to open connection:\n%s", error);
573 logctx = log_init(NULL, &cfg);
574 back->provide_logctx(backhandle, logctx);
575 console_provide_logctx(logctx);
580 stdinevent = CreateEvent(NULL, FALSE, FALSE, NULL);
581 stdoutevent = CreateEvent(NULL, FALSE, FALSE, NULL);
582 stderrevent = CreateEvent(NULL, FALSE, FALSE, NULL);
584 inhandle = GetStdHandle(STD_INPUT_HANDLE);
585 outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
586 errhandle = GetStdHandle(STD_ERROR_HANDLE);
587 GetConsoleMode(inhandle, &orig_console_mode);
588 SetConsoleMode(inhandle, ENABLE_PROCESSED_INPUT);
590 main_thread_id = GetCurrentThreadId();
593 * Turn off ECHO and LINE input modes. We don't care if this
594 * call fails, because we know we aren't necessarily running in
597 handles[0] = netevent;
598 handles[1] = stdinevent;
599 handles[2] = stdoutevent;
600 handles[3] = stderrevent;
604 * Create spare threads to write to stdout and stderr, so we
605 * can arrange asynchronous writes.
607 odata.event = stdoutevent;
608 odata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL);
610 odata.busy = odata.done = 0;
611 if (!CreateThread(NULL, 0, stdout_write_thread,
612 &odata, 0, &out_threadid)) {
613 fprintf(stderr, "Unable to create output thread\n");
616 edata.event = stderrevent;
617 edata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL);
619 edata.busy = edata.done = 0;
620 if (!CreateThread(NULL, 0, stdout_write_thread,
621 &edata, 0, &err_threadid)) {
622 fprintf(stderr, "Unable to create error output thread\n");
629 if (!sending && back->sendok(backhandle)) {
631 * Create a separate thread to read from stdin. This is
632 * a total pain, but I can't find another way to do it:
634 * - an overlapped ReadFile or ReadFileEx just doesn't
635 * happen; we get failure from ReadFileEx, and
636 * ReadFile blocks despite being given an OVERLAPPED
637 * structure. Perhaps we can't do overlapped reads
638 * on consoles. WHY THE HELL NOT?
640 * - WaitForMultipleObjects(netevent, console) doesn't
641 * work, because it signals the console when
642 * _anything_ happens, including mouse motions and
643 * other things that don't cause data to be readable
644 * - so we're back to ReadFile blocking.
646 idata.event = stdinevent;
647 idata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL);
648 if (!CreateThread(NULL, 0, stdin_read_thread,
649 &idata, 0, &in_threadid)) {
650 fprintf(stderr, "Unable to create input thread\n");
656 n = MsgWaitForMultipleObjects(4, handles, FALSE, INFINITE,
659 WSANETWORKEVENTS things;
661 extern SOCKET first_socket(int *), next_socket(int *);
662 extern int select_result(WPARAM, LPARAM);
666 * We must not call select_result() for any socket
667 * until we have finished enumerating within the tree.
668 * This is because select_result() may close the socket
669 * and modify the tree.
671 /* Count the active sockets. */
673 for (socket = first_socket(&socketstate);
674 socket != INVALID_SOCKET;
675 socket = next_socket(&socketstate)) i++;
677 /* Expand the buffer if necessary. */
680 sklist = sresize(sklist, sksize, SOCKET);
683 /* Retrieve the sockets into sklist. */
685 for (socket = first_socket(&socketstate);
686 socket != INVALID_SOCKET;
687 socket = next_socket(&socketstate)) {
688 sklist[skcount++] = socket;
691 /* Now we're done enumerating; go through the list. */
692 for (i = 0; i < skcount; i++) {
695 wp = (WPARAM) socket;
696 if (!WSAEnumNetworkEvents(socket, NULL, &things)) {
697 static const struct { int bit, mask; } eventtypes[] = {
698 {FD_CONNECT_BIT, FD_CONNECT},
699 {FD_READ_BIT, FD_READ},
700 {FD_CLOSE_BIT, FD_CLOSE},
701 {FD_OOB_BIT, FD_OOB},
702 {FD_WRITE_BIT, FD_WRITE},
703 {FD_ACCEPT_BIT, FD_ACCEPT},
707 noise_ultralight(socket);
708 noise_ultralight(things.lNetworkEvents);
710 for (e = 0; e < lenof(eventtypes); e++)
711 if (things.lNetworkEvents & eventtypes[e].mask) {
713 int err = things.iErrorCode[eventtypes[e].bit];
714 lp = WSAMAKESELECTREPLY(eventtypes[e].mask, err);
715 connopen &= select_result(wp, lp);
721 noise_ultralight(idata.len);
722 if (connopen && back->socket(backhandle) != NULL) {
724 back->send(backhandle, idata.buffer, idata.len);
726 back->special(backhandle, TS_EOF);
731 if (!odata.writeret) {
732 fprintf(stderr, "Unable to write to standard output\n");
735 bufchain_consume(&stdout_data, odata.lenwritten);
736 if (bufchain_size(&stdout_data) > 0)
738 if (connopen && back->socket(backhandle) != NULL) {
739 back->unthrottle(backhandle, bufchain_size(&stdout_data) +
740 bufchain_size(&stderr_data));
744 if (!edata.writeret) {
745 fprintf(stderr, "Unable to write to standard output\n");
748 bufchain_consume(&stderr_data, edata.lenwritten);
749 if (bufchain_size(&stderr_data) > 0)
751 if (connopen && back->socket(backhandle) != NULL) {
752 back->unthrottle(backhandle, bufchain_size(&stdout_data) +
753 bufchain_size(&stderr_data));
757 while (PeekMessage(&msg, INVALID_HANDLE_VALUE,
758 WM_AGENT_CALLBACK, WM_AGENT_CALLBACK,
760 struct agent_callback *c = (struct agent_callback *)msg.lParam;
761 c->callback(c->callback_ctx, c->data, c->len);
765 if (!reading && back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
766 SetEvent(idata.eventback);
769 if ((!connopen || back->socket(backhandle) == NULL) &&
770 bufchain_size(&stdout_data) == 0 &&
771 bufchain_size(&stderr_data) == 0)
772 break; /* we closed the connection */
775 exitcode = back->exitcode(backhandle);
777 fprintf(stderr, "Remote process exit code unavailable\n");
778 exitcode = 1; /* this is an error condition */