2 * PLink - a Windows command-line (stdin/stdout) variant of PuTTY.
10 #define PUTTY_DO_GLOBALS /* actually _define_ globals */
15 #define WM_AGENT_CALLBACK (WM_XUSER + 4)
17 #define MAX_STDIN_BACKLOG 4096
19 struct agent_callback {
20 void (*callback)(void *, void *, int);
26 void fatalbox(char *p, ...)
29 fprintf(stderr, "FATAL ERROR: ");
31 vfprintf(stderr, p, ap);
36 void modalfatalbox(char *p, ...)
39 fprintf(stderr, "FATAL ERROR: ");
41 vfprintf(stderr, p, ap);
46 void connection_fatal(void *frontend, char *p, ...)
49 fprintf(stderr, "FATAL ERROR: ");
51 vfprintf(stderr, p, ap);
56 void cmdline_error(char *p, ...)
59 fprintf(stderr, "plink: ");
61 vfprintf(stderr, p, ap);
67 HANDLE inhandle, outhandle, errhandle;
68 DWORD orig_console_mode;
73 static void *backhandle;
76 int term_ldisc(Terminal *term, int mode)
80 void ldisc_update(void *frontend, int echo, int edit)
82 /* Update stdin read mode to reflect changes in line discipline. */
85 mode = ENABLE_PROCESSED_INPUT;
87 mode = mode | ENABLE_ECHO_INPUT;
89 mode = mode & ~ENABLE_ECHO_INPUT;
91 mode = mode | ENABLE_LINE_INPUT;
93 mode = mode & ~ENABLE_LINE_INPUT;
94 SetConsoleMode(inhandle, mode);
100 HANDLE event, eventback;
103 static DWORD WINAPI stdin_read_thread(void *param)
105 struct input_data *idata = (struct input_data *) param;
108 inhandle = GetStdHandle(STD_INPUT_HANDLE);
110 while (ReadFile(inhandle, idata->buffer, sizeof(idata->buffer),
111 &idata->len, NULL) && idata->len > 0) {
112 SetEvent(idata->event);
113 WaitForSingleObject(idata->eventback, INFINITE);
117 SetEvent(idata->event);
123 DWORD len, lenwritten;
127 HANDLE event, eventback;
131 static DWORD WINAPI stdout_write_thread(void *param)
133 struct output_data *odata = (struct output_data *) param;
134 HANDLE outhandle, errhandle;
136 outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
137 errhandle = GetStdHandle(STD_ERROR_HANDLE);
140 WaitForSingleObject(odata->eventback, INFINITE);
144 WriteFile(odata->is_stderr ? errhandle : outhandle,
145 odata->buffer, odata->len, &odata->lenwritten, NULL);
146 SetEvent(odata->event);
152 bufchain stdout_data, stderr_data;
153 struct output_data odata, edata;
155 void try_output(int is_stderr)
157 struct output_data *data = (is_stderr ? &edata : &odata);
162 bufchain_prefix(is_stderr ? &stderr_data : &stdout_data,
163 &senddata, &sendlen);
164 data->buffer = senddata;
166 SetEvent(data->eventback);
171 int from_backend(void *frontend_handle, int is_stderr,
172 const char *data, int len)
177 bufchain_add(&stderr_data, data, len);
180 bufchain_add(&stdout_data, data, len);
184 osize = bufchain_size(&stdout_data);
185 esize = bufchain_size(&stderr_data);
187 return osize + esize;
190 static DWORD main_thread_id;
192 void agent_schedule_callback(void (*callback)(void *, void *, int),
193 void *callback_ctx, void *data, int len)
195 struct agent_callback *c = snew(struct agent_callback);
196 c->callback = callback;
197 c->callback_ctx = callback_ctx;
200 PostThreadMessage(main_thread_id, WM_AGENT_CALLBACK, 0, (LPARAM)c);
204 * Short description of parameters.
206 static void usage(void)
208 printf("PuTTY Link: command-line connection utility\n");
210 printf("Usage: plink [options] [user@]host [command]\n");
211 printf(" (\"host\" can also be a PuTTY saved session name)\n");
212 printf("Options:\n");
213 printf(" -V print version information\n");
214 printf(" -v show verbose messages\n");
215 printf(" -load sessname Load settings from saved session\n");
216 printf(" -ssh -telnet -rlogin -raw\n");
217 printf(" force use of a particular protocol (default SSH)\n");
218 printf(" -P port connect to specified port\n");
219 printf(" -l user connect with specified username\n");
220 printf(" -m file read remote command(s) from file\n");
221 printf(" -batch disable all interactive prompts\n");
222 printf("The following options only apply to SSH connections:\n");
223 printf(" -pw passw login with specified password\n");
224 printf(" -D [listen-IP:]listen-port\n");
225 printf(" Dynamic SOCKS-based port forwarding\n");
226 printf(" -L [listen-IP:]listen-port:host:port\n");
227 printf(" Forward local port to remote address\n");
228 printf(" -R [listen-IP:]listen-port:host:port\n");
229 printf(" Forward remote port to local address\n");
230 printf(" -X -x enable / disable X11 forwarding\n");
231 printf(" -A -a enable / disable agent forwarding\n");
232 printf(" -t -T enable / disable pty allocation\n");
233 printf(" -1 -2 force use of particular protocol version\n");
234 printf(" -C enable compression\n");
235 printf(" -i key private key file for authentication\n");
236 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
240 static void version(void)
242 printf("plink: %s\n", ver);
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 (p_WSAEventSelect(skt, netevent, events) == SOCKET_ERROR) {
256 switch (p_WSAGetLastError()) {
258 return "Network is down";
260 return "WSAEventSelect(): unknown error";
266 int main(int argc, char **argv)
268 WSAEVENT stdinevent, stdoutevent, stderrevent;
270 DWORD in_threadid, out_threadid, err_threadid;
271 struct input_data idata;
280 int use_subsystem = 0;
282 ssh_get_line = console_get_line;
285 skcount = sksize = 0;
287 * Initialise port and protocol to sensible defaults. (These
288 * will be overridden by more or less anything.)
290 default_protocol = PROT_SSH;
295 * Process the command line.
297 do_defaults(NULL, &cfg);
298 loaded_session = FALSE;
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. */
337 } else if (!strcmp(p, "-V")) {
340 fprintf(stderr, "plink: unknown option \"%s\"\n", p);
347 * If the hostname starts with "telnet:", set the
348 * protocol to Telnet and process the string as a
351 if (!strncmp(q, "telnet:", 7)) {
355 if (q[0] == '/' && q[1] == '/')
357 cfg.protocol = PROT_TELNET;
359 while (*p && *p != ':' && *p != '/')
368 strncpy(cfg.host, q, sizeof(cfg.host) - 1);
369 cfg.host[sizeof(cfg.host) - 1] = '\0';
373 * Before we process the [user@]host string, we
374 * first check for the presence of a protocol
375 * prefix (a protocol name followed by ",").
380 for (i = 0; backends[i].backend != NULL; i++) {
381 j = strlen(backends[i].name);
383 !memcmp(backends[i].name, p, j)) {
384 default_protocol = cfg.protocol =
385 backends[i].protocol;
387 backends[i].backend->default_port;
395 * Three cases. Either (a) there's a nonzero
396 * length string followed by an @, in which
397 * case that's user and the remainder is host.
398 * Or (b) there's only one string, not counting
399 * a potential initial @, and it exists in the
400 * saved-sessions database. Or (c) only one
401 * string and it _doesn't_ exist in the
406 p++, r = NULL; /* discount initial @ */
412 do_defaults(p, &cfg2);
413 if (loaded_session || cfg2.host[0] == '\0') {
414 /* No settings for this host; use defaults */
415 /* (or session was already loaded with -load) */
416 strncpy(cfg.host, p, sizeof(cfg.host) - 1);
417 cfg.host[sizeof(cfg.host) - 1] = '\0';
418 cfg.port = default_port;
421 /* Ick: patch up internal pointer after copy */
422 cfg.remote_cmd_ptr = cfg.remote_cmd;
426 strncpy(cfg.username, p, sizeof(cfg.username) - 1);
427 cfg.username[sizeof(cfg.username) - 1] = '\0';
428 strncpy(cfg.host, r, sizeof(cfg.host) - 1);
429 cfg.host[sizeof(cfg.host) - 1] = '\0';
430 cfg.port = default_port;
436 cmdlen = cmdsize = 0;
441 if (cmdlen >= cmdsize) {
442 cmdsize = cmdlen + 512;
443 command = sresize(command, cmdsize, char);
445 command[cmdlen++]=*p++;
447 if (cmdlen >= cmdsize) {
448 cmdsize = cmdlen + 512;
449 command = sresize(command, cmdsize, char);
451 command[cmdlen++]=' '; /* always add trailing space */
452 if (--argc) p = *++argv;
454 if (cmdlen) command[--cmdlen]='\0';
455 /* change trailing blank to NUL */
456 cfg.remote_cmd_ptr = command;
457 cfg.remote_cmd_ptr2 = NULL;
458 cfg.nopty = TRUE; /* command => no terminal */
460 break; /* done with cmdline */
473 * Trim leading whitespace off the hostname if it's there.
476 int space = strspn(cfg.host, " \t");
477 memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
480 /* See if host is of the form user@host */
481 if (cfg.host[0] != '\0') {
482 char *atsign = strchr(cfg.host, '@');
483 /* Make sure we're not overflowing the user field */
485 if (atsign - cfg.host < sizeof cfg.username) {
486 strncpy(cfg.username, cfg.host, atsign - cfg.host);
487 cfg.username[atsign - cfg.host] = '\0';
489 memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
494 * Perform command-line overrides on session configuration.
496 cmdline_run_saved(&cfg);
499 * Apply subsystem status.
502 cfg.ssh_subsys = TRUE;
505 * Trim a colon suffix off the hostname if it's there.
507 cfg.host[strcspn(cfg.host, ":")] = '\0';
510 * Remove any remaining whitespace from the hostname.
514 while (cfg.host[p2] != '\0') {
515 if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
516 cfg.host[p1] = cfg.host[p2];
524 if (!*cfg.remote_cmd_ptr)
525 flags |= FLAG_INTERACTIVE;
528 * Select protocol. This is farmed out into a table in a
529 * separate file to enable an ssh-free variant.
534 for (i = 0; backends[i].backend != NULL; i++)
535 if (backends[i].protocol == cfg.protocol) {
536 back = backends[i].backend;
541 "Internal fault: Unsupported protocol found\n");
549 if (portnumber != -1)
550 cfg.port = portnumber;
553 if (p_WSAEventSelect == NULL) {
554 fprintf(stderr, "Plink requires WinSock 2\n");
559 * Start up the connection.
561 netevent = CreateEvent(NULL, FALSE, FALSE, NULL);
565 /* nodelay is only useful if stdin is a character device (console) */
566 int nodelay = cfg.tcp_nodelay &&
567 (GetFileType(GetStdHandle(STD_INPUT_HANDLE)) == FILE_TYPE_CHAR);
569 error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
570 &realhost, nodelay, cfg.tcp_keepalives);
572 fprintf(stderr, "Unable to open connection:\n%s", error);
575 logctx = log_init(NULL, &cfg);
576 back->provide_logctx(backhandle, logctx);
577 console_provide_logctx(logctx);
582 stdinevent = CreateEvent(NULL, FALSE, FALSE, NULL);
583 stdoutevent = CreateEvent(NULL, FALSE, FALSE, NULL);
584 stderrevent = CreateEvent(NULL, FALSE, FALSE, NULL);
586 inhandle = GetStdHandle(STD_INPUT_HANDLE);
587 outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
588 errhandle = GetStdHandle(STD_ERROR_HANDLE);
589 GetConsoleMode(inhandle, &orig_console_mode);
590 SetConsoleMode(inhandle, ENABLE_PROCESSED_INPUT);
592 main_thread_id = GetCurrentThreadId();
595 * Turn off ECHO and LINE input modes. We don't care if this
596 * call fails, because we know we aren't necessarily running in
599 handles[0] = netevent;
600 handles[1] = stdinevent;
601 handles[2] = stdoutevent;
602 handles[3] = stderrevent;
606 * Create spare threads to write to stdout and stderr, so we
607 * can arrange asynchronous writes.
609 odata.event = stdoutevent;
610 odata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL);
612 odata.busy = odata.done = 0;
613 if (!CreateThread(NULL, 0, stdout_write_thread,
614 &odata, 0, &out_threadid)) {
615 fprintf(stderr, "Unable to create output thread\n");
618 edata.event = stderrevent;
619 edata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL);
621 edata.busy = edata.done = 0;
622 if (!CreateThread(NULL, 0, stdout_write_thread,
623 &edata, 0, &err_threadid)) {
624 fprintf(stderr, "Unable to create error output thread\n");
631 if (!sending && back->sendok(backhandle)) {
633 * Create a separate thread to read from stdin. This is
634 * a total pain, but I can't find another way to do it:
636 * - an overlapped ReadFile or ReadFileEx just doesn't
637 * happen; we get failure from ReadFileEx, and
638 * ReadFile blocks despite being given an OVERLAPPED
639 * structure. Perhaps we can't do overlapped reads
640 * on consoles. WHY THE HELL NOT?
642 * - WaitForMultipleObjects(netevent, console) doesn't
643 * work, because it signals the console when
644 * _anything_ happens, including mouse motions and
645 * other things that don't cause data to be readable
646 * - so we're back to ReadFile blocking.
648 idata.event = stdinevent;
649 idata.eventback = CreateEvent(NULL, FALSE, FALSE, NULL);
650 if (!CreateThread(NULL, 0, stdin_read_thread,
651 &idata, 0, &in_threadid)) {
652 fprintf(stderr, "Unable to create input thread\n");
658 n = MsgWaitForMultipleObjects(4, handles, FALSE, INFINITE,
661 WSANETWORKEVENTS things;
663 extern SOCKET first_socket(int *), next_socket(int *);
664 extern int select_result(WPARAM, LPARAM);
668 * We must not call select_result() for any socket
669 * until we have finished enumerating within the tree.
670 * This is because select_result() may close the socket
671 * and modify the tree.
673 /* Count the active sockets. */
675 for (socket = first_socket(&socketstate);
676 socket != INVALID_SOCKET;
677 socket = next_socket(&socketstate)) i++;
679 /* Expand the buffer if necessary. */
682 sklist = sresize(sklist, sksize, SOCKET);
685 /* Retrieve the sockets into sklist. */
687 for (socket = first_socket(&socketstate);
688 socket != INVALID_SOCKET;
689 socket = next_socket(&socketstate)) {
690 sklist[skcount++] = socket;
693 /* Now we're done enumerating; go through the list. */
694 for (i = 0; i < skcount; i++) {
697 wp = (WPARAM) socket;
698 if (!p_WSAEnumNetworkEvents(socket, NULL, &things)) {
699 static const struct { int bit, mask; } eventtypes[] = {
700 {FD_CONNECT_BIT, FD_CONNECT},
701 {FD_READ_BIT, FD_READ},
702 {FD_CLOSE_BIT, FD_CLOSE},
703 {FD_OOB_BIT, FD_OOB},
704 {FD_WRITE_BIT, FD_WRITE},
705 {FD_ACCEPT_BIT, FD_ACCEPT},
709 noise_ultralight(socket);
710 noise_ultralight(things.lNetworkEvents);
712 for (e = 0; e < lenof(eventtypes); e++)
713 if (things.lNetworkEvents & eventtypes[e].mask) {
715 int err = things.iErrorCode[eventtypes[e].bit];
716 lp = WSAMAKESELECTREPLY(eventtypes[e].mask, err);
717 connopen &= select_result(wp, lp);
723 noise_ultralight(idata.len);
724 if (connopen && back->socket(backhandle) != NULL) {
726 back->send(backhandle, idata.buffer, idata.len);
728 back->special(backhandle, TS_EOF);
733 if (!odata.writeret) {
734 fprintf(stderr, "Unable to write to standard output\n");
737 bufchain_consume(&stdout_data, odata.lenwritten);
738 if (bufchain_size(&stdout_data) > 0)
740 if (connopen && back->socket(backhandle) != NULL) {
741 back->unthrottle(backhandle, bufchain_size(&stdout_data) +
742 bufchain_size(&stderr_data));
746 if (!edata.writeret) {
747 fprintf(stderr, "Unable to write to standard output\n");
750 bufchain_consume(&stderr_data, edata.lenwritten);
751 if (bufchain_size(&stderr_data) > 0)
753 if (connopen && back->socket(backhandle) != NULL) {
754 back->unthrottle(backhandle, bufchain_size(&stdout_data) +
755 bufchain_size(&stderr_data));
759 while (PeekMessage(&msg, INVALID_HANDLE_VALUE,
760 WM_AGENT_CALLBACK, WM_AGENT_CALLBACK,
762 struct agent_callback *c = (struct agent_callback *)msg.lParam;
763 c->callback(c->callback_ctx, c->data, c->len);
767 if (!reading && back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
768 SetEvent(idata.eventback);
771 if ((!connopen || back->socket(backhandle) == NULL) &&
772 bufchain_size(&stdout_data) == 0 &&
773 bufchain_size(&stderr_data) == 0)
774 break; /* we closed the connection */
776 exitcode = back->exitcode(backhandle);
778 fprintf(stderr, "Remote process exit code unavailable\n");
779 exitcode = 1; /* this is an error condition */
781 cleanup_exit(exitcode);
782 return 0; /* placate compiler warning */