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_APP + 4)
17 struct agent_callback {
18 void (*callback)(void *, void *, int);
24 void fatalbox(char *p, ...)
27 fprintf(stderr, "FATAL ERROR: ");
29 vfprintf(stderr, p, ap);
38 void modalfatalbox(char *p, ...)
41 fprintf(stderr, "FATAL ERROR: ");
43 vfprintf(stderr, p, ap);
52 void connection_fatal(void *frontend, char *p, ...)
55 fprintf(stderr, "FATAL ERROR: ");
57 vfprintf(stderr, p, ap);
66 void cmdline_error(char *p, ...)
69 fprintf(stderr, "plink: ");
71 vfprintf(stderr, p, ap);
77 HANDLE inhandle, outhandle, errhandle;
78 struct handle *stdin_handle, *stdout_handle, *stderr_handle;
79 DWORD orig_console_mode;
85 static void *backhandle;
88 int term_ldisc(Terminal *term, int mode)
92 void ldisc_update(void *frontend, int echo, int edit)
94 /* Update stdin read mode to reflect changes in line discipline. */
97 mode = ENABLE_PROCESSED_INPUT;
99 mode = mode | ENABLE_ECHO_INPUT;
101 mode = mode & ~ENABLE_ECHO_INPUT;
103 mode = mode | ENABLE_LINE_INPUT;
105 mode = mode & ~ENABLE_LINE_INPUT;
106 SetConsoleMode(inhandle, mode);
109 char *get_ttymode(void *frontend, const char *mode) { return NULL; }
111 int from_backend(void *frontend_handle, int is_stderr,
112 const char *data, int len)
115 handle_write(stderr_handle, data, len);
117 handle_write(stdout_handle, data, len);
120 return handle_backlog(stdout_handle) + handle_backlog(stderr_handle);
123 int from_backend_untrusted(void *frontend_handle, const char *data, int len)
126 * No "untrusted" output should get here (the way the code is
127 * currently, it's all diverted by FLAG_STDERR).
129 assert(!"Unexpected call to from_backend_untrusted()");
130 return 0; /* not reached */
133 int get_userpass_input(prompts_t *p, unsigned char *in, int inlen)
136 ret = cmdline_get_passwd_input(p, in, inlen);
138 ret = console_get_userpass_input(p, in, inlen);
142 static DWORD main_thread_id;
144 void agent_schedule_callback(void (*callback)(void *, void *, int),
145 void *callback_ctx, void *data, int len)
147 struct agent_callback *c = snew(struct agent_callback);
148 c->callback = callback;
149 c->callback_ctx = callback_ctx;
152 PostThreadMessage(main_thread_id, WM_AGENT_CALLBACK, 0, (LPARAM)c);
156 * Short description of parameters.
158 static void usage(void)
160 printf("PuTTY Link: command-line connection utility\n");
162 printf("Usage: plink [options] [user@]host [command]\n");
163 printf(" (\"host\" can also be a PuTTY saved session name)\n");
164 printf("Options:\n");
165 printf(" -V print version information and exit\n");
166 printf(" -pgpfp print PGP key fingerprints and exit\n");
167 printf(" -v show verbose messages\n");
168 printf(" -load sessname Load settings from saved session\n");
169 printf(" -ssh -telnet -rlogin -raw\n");
170 printf(" force use of a particular protocol\n");
171 printf(" -P port connect to specified port\n");
172 printf(" -l user connect with specified username\n");
173 printf(" -batch disable all interactive prompts\n");
174 printf("The following options only apply to SSH connections:\n");
175 printf(" -pw passw login with specified password\n");
176 printf(" -D [listen-IP:]listen-port\n");
177 printf(" Dynamic SOCKS-based port forwarding\n");
178 printf(" -L [listen-IP:]listen-port:host:port\n");
179 printf(" Forward local port to remote address\n");
180 printf(" -R [listen-IP:]listen-port:host:port\n");
181 printf(" Forward remote port to local address\n");
182 printf(" -X -x enable / disable X11 forwarding\n");
183 printf(" -A -a enable / disable agent forwarding\n");
184 printf(" -t -T enable / disable pty allocation\n");
185 printf(" -1 -2 force use of particular protocol version\n");
186 printf(" -4 -6 force use of IPv4 or IPv6\n");
187 printf(" -C enable compression\n");
188 printf(" -i key private key file for authentication\n");
189 printf(" -noagent disable use of Pageant\n");
190 printf(" -agent enable use of Pageant\n");
191 printf(" -m file read remote command(s) from file\n");
192 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
193 printf(" -N don't start a shell/command (SSH-2 only)\n");
194 printf(" -nc host:port\n");
195 printf(" open tunnel in place of session (SSH-2 only)\n");
199 static void version(void)
201 printf("plink: %s\n", ver);
205 char *do_select(SOCKET skt, int startup)
209 events = (FD_CONNECT | FD_READ | FD_WRITE |
210 FD_OOB | FD_CLOSE | FD_ACCEPT);
214 if (p_WSAEventSelect(skt, netevent, events) == SOCKET_ERROR) {
215 switch (p_WSAGetLastError()) {
217 return "Network is down";
219 return "WSAEventSelect(): unknown error";
225 int stdin_gotdata(struct handle *h, void *data, int len)
229 * Special case: report read error.
232 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, -len, 0,
233 buf, lenof(buf), NULL);
234 buf[lenof(buf)-1] = '\0';
235 if (buf[strlen(buf)-1] == '\n')
236 buf[strlen(buf)-1] = '\0';
237 fprintf(stderr, "Unable to read from standard input: %s\n", buf);
240 noise_ultralight(len);
241 if (connopen && back->connected(backhandle)) {
243 return back->send(backhandle, data, len);
245 back->special(backhandle, TS_EOF);
252 void stdouterr_sent(struct handle *h, int new_backlog)
254 if (new_backlog < 0) {
256 * Special case: report write error.
259 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, -new_backlog, 0,
260 buf, lenof(buf), NULL);
261 buf[lenof(buf)-1] = '\0';
262 if (buf[strlen(buf)-1] == '\n')
263 buf[strlen(buf)-1] = '\0';
264 fprintf(stderr, "Unable to write to standard %s: %s\n",
265 (h == stdout_handle ? "output" : "error"), buf);
268 if (connopen && back->connected(backhandle)) {
269 back->unthrottle(backhandle, (handle_backlog(stdout_handle) +
270 handle_backlog(stderr_handle)));
274 int main(int argc, char **argv)
282 int use_subsystem = 0;
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 loaded_session = FALSE;
300 default_protocol = cfg.protocol;
301 default_port = cfg.port;
305 * Override the default protocol if PLINK_PROTOCOL is set.
307 char *p = getenv("PLINK_PROTOCOL");
310 const Backend *b = backend_from_name(p);
312 default_protocol = cfg.protocol = b->protocol;
313 default_port = cfg.port = b->default_port;
320 int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
324 "plink: option \"%s\" requires an argument\n", p);
326 } else if (ret == 2) {
328 } else if (ret == 1) {
330 } else if (!strcmp(p, "-batch")) {
331 console_batch_mode = 1;
332 } else if (!strcmp(p, "-s")) {
333 /* Save status to write to cfg later. */
335 } else if (!strcmp(p, "-V")) {
337 } else if (!strcmp(p, "-pgpfp")) {
341 fprintf(stderr, "plink: unknown option \"%s\"\n", p);
345 if (!cfg_launchable(&cfg)) {
348 * If the hostname starts with "telnet:", set the
349 * protocol to Telnet and process the string as a
352 if (!strncmp(q, "telnet:", 7)) {
356 if (q[0] == '/' && q[1] == '/')
358 cfg.protocol = PROT_TELNET;
360 while (*p && *p != ':' && *p != '/')
369 strncpy(cfg.host, q, sizeof(cfg.host) - 1);
370 cfg.host[sizeof(cfg.host) - 1] = '\0';
372 char *r, *user, *host;
374 * Before we process the [user@]host string, we
375 * first check for the presence of a protocol
376 * prefix (a protocol name followed by ",").
382 b = backend_from_name(p);
384 default_protocol = cfg.protocol = b->protocol;
385 portnumber = b->default_port;
391 * A nonzero length string followed by an @ is treated
392 * as a username. (We discount an _initial_ @.) The
393 * rest of the string (or the whole string if no @)
394 * is treated as a session name and/or hostname.
398 p++, r = NULL; /* discount initial @ */
403 user = NULL, host = p;
407 * Now attempt to load a saved session with the
408 * same name as the hostname.
412 do_defaults(host, &cfg2);
413 if (loaded_session || !cfg_launchable(&cfg2)) {
414 /* No settings for this host; use defaults */
415 /* (or session was already loaded with -load) */
416 strncpy(cfg.host, host, sizeof(cfg.host) - 1);
417 cfg.host[sizeof(cfg.host) - 1] = '\0';
418 cfg.port = default_port;
425 /* Patch in specified username. */
426 strncpy(cfg.username, user,
427 sizeof(cfg.username) - 1);
428 cfg.username[sizeof(cfg.username) - 1] = '\0';
435 cmdlen = cmdsize = 0;
440 if (cmdlen >= cmdsize) {
441 cmdsize = cmdlen + 512;
442 command = sresize(command, cmdsize, char);
444 command[cmdlen++]=*p++;
446 if (cmdlen >= cmdsize) {
447 cmdsize = cmdlen + 512;
448 command = sresize(command, cmdsize, char);
450 command[cmdlen++]=' '; /* always add trailing space */
451 if (--argc) p = *++argv;
453 if (cmdlen) command[--cmdlen]='\0';
454 /* change trailing blank to NUL */
455 cfg.remote_cmd_ptr = command;
456 cfg.remote_cmd_ptr2 = NULL;
457 cfg.nopty = TRUE; /* command => no terminal */
459 break; /* done with cmdline */
467 if (!cfg_launchable(&cfg)) {
472 * Trim leading whitespace off the hostname if it's there.
475 int space = strspn(cfg.host, " \t");
476 memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
479 /* See if host is of the form user@host */
480 if (cfg_launchable(&cfg)) {
481 char *atsign = strrchr(cfg.host, '@');
482 /* Make sure we're not overflowing the user field */
484 if (atsign - cfg.host < sizeof cfg.username) {
485 strncpy(cfg.username, cfg.host, atsign - cfg.host);
486 cfg.username[atsign - cfg.host] = '\0';
488 memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
493 * Perform command-line overrides on session configuration.
495 cmdline_run_saved(&cfg);
498 * Apply subsystem status.
501 cfg.ssh_subsys = TRUE;
504 * Trim a colon suffix off the hostname if it's there.
506 cfg.host[strcspn(cfg.host, ":")] = '\0';
509 * Remove any remaining whitespace from the hostname.
513 while (cfg.host[p2] != '\0') {
514 if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
515 cfg.host[p1] = cfg.host[p2];
523 if (!cfg.remote_cmd_ptr && !*cfg.remote_cmd && !*cfg.ssh_nc_host)
524 flags |= FLAG_INTERACTIVE;
527 * Select protocol. This is farmed out into a table in a
528 * separate file to enable an ssh-free variant.
530 back = backend_from_proto(cfg.protocol);
533 "Internal fault: Unsupported protocol found\n");
540 if (portnumber != -1)
541 cfg.port = portnumber;
544 if (p_WSAEventSelect == NULL) {
545 fprintf(stderr, "Plink requires WinSock 2\n");
549 logctx = log_init(NULL, &cfg);
550 console_provide_logctx(logctx);
553 * Start up the connection.
555 netevent = CreateEvent(NULL, FALSE, FALSE, NULL);
559 /* nodelay is only useful if stdin is a character device (console) */
560 int nodelay = cfg.tcp_nodelay &&
561 (GetFileType(GetStdHandle(STD_INPUT_HANDLE)) == FILE_TYPE_CHAR);
563 error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
564 &realhost, nodelay, cfg.tcp_keepalives);
566 fprintf(stderr, "Unable to open connection:\n%s", error);
569 back->provide_logctx(backhandle, logctx);
574 inhandle = GetStdHandle(STD_INPUT_HANDLE);
575 outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
576 errhandle = GetStdHandle(STD_ERROR_HANDLE);
579 * Turn off ECHO and LINE input modes. We don't care if this
580 * call fails, because we know we aren't necessarily running in
583 GetConsoleMode(inhandle, &orig_console_mode);
584 SetConsoleMode(inhandle, ENABLE_PROCESSED_INPUT);
587 * Pass the output handles to the handle-handling subsystem.
588 * (The input one we leave until we're through the
589 * authentication process.)
591 stdout_handle = handle_output_new(outhandle, stdouterr_sent, NULL, 0);
592 stderr_handle = handle_output_new(errhandle, stdouterr_sent, NULL, 0);
594 main_thread_id = GetCurrentThreadId();
598 now = GETTICKCOUNT();
606 if (!sending && back->sendok(backhandle)) {
607 stdin_handle = handle_input_new(inhandle, stdin_gotdata, NULL,
612 if (run_timers(now, &next)) {
613 ticks = next - GETTICKCOUNT();
614 if (ticks < 0) ticks = 0; /* just in case */
619 handles = handle_get_events(&nhandles);
620 handles = sresize(handles, nhandles+1, HANDLE);
621 handles[nhandles] = netevent;
622 n = MsgWaitForMultipleObjects(nhandles+1, handles, FALSE, ticks,
624 if ((unsigned)(n - WAIT_OBJECT_0) < (unsigned)nhandles) {
625 handle_got_event(handles[n - WAIT_OBJECT_0]);
626 } else if (n == WAIT_OBJECT_0 + nhandles) {
627 WSANETWORKEVENTS things;
629 extern SOCKET first_socket(int *), next_socket(int *);
630 extern int select_result(WPARAM, LPARAM);
634 * We must not call select_result() for any socket
635 * until we have finished enumerating within the tree.
636 * This is because select_result() may close the socket
637 * and modify the tree.
639 /* Count the active sockets. */
641 for (socket = first_socket(&socketstate);
642 socket != INVALID_SOCKET;
643 socket = next_socket(&socketstate)) i++;
645 /* Expand the buffer if necessary. */
648 sklist = sresize(sklist, sksize, SOCKET);
651 /* Retrieve the sockets into sklist. */
653 for (socket = first_socket(&socketstate);
654 socket != INVALID_SOCKET;
655 socket = next_socket(&socketstate)) {
656 sklist[skcount++] = socket;
659 /* Now we're done enumerating; go through the list. */
660 for (i = 0; i < skcount; i++) {
663 wp = (WPARAM) socket;
664 if (!p_WSAEnumNetworkEvents(socket, NULL, &things)) {
665 static const struct { int bit, mask; } eventtypes[] = {
666 {FD_CONNECT_BIT, FD_CONNECT},
667 {FD_READ_BIT, FD_READ},
668 {FD_CLOSE_BIT, FD_CLOSE},
669 {FD_OOB_BIT, FD_OOB},
670 {FD_WRITE_BIT, FD_WRITE},
671 {FD_ACCEPT_BIT, FD_ACCEPT},
675 noise_ultralight(socket);
676 noise_ultralight(things.lNetworkEvents);
678 for (e = 0; e < lenof(eventtypes); e++)
679 if (things.lNetworkEvents & eventtypes[e].mask) {
681 int err = things.iErrorCode[eventtypes[e].bit];
682 lp = WSAMAKESELECTREPLY(eventtypes[e].mask, err);
683 connopen &= select_result(wp, lp);
687 } else if (n == WAIT_OBJECT_0 + nhandles + 1) {
689 while (PeekMessage(&msg, INVALID_HANDLE_VALUE,
690 WM_AGENT_CALLBACK, WM_AGENT_CALLBACK,
692 struct agent_callback *c = (struct agent_callback *)msg.lParam;
693 c->callback(c->callback_ctx, c->data, c->len);
698 if (n == WAIT_TIMEOUT) {
701 now = GETTICKCOUNT();
707 handle_unthrottle(stdin_handle, back->sendbuffer(backhandle));
709 if ((!connopen || !back->connected(backhandle)) &&
710 handle_backlog(stdout_handle) + handle_backlog(stderr_handle) == 0)
711 break; /* we closed the connection */
713 exitcode = back->exitcode(backhandle);
715 fprintf(stderr, "Remote process exit code unavailable\n");
716 exitcode = 1; /* this is an error condition */
718 cleanup_exit(exitcode);
719 return 0; /* placate compiler warning */