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 nonfatal(char *p, ...)
55 fprintf(stderr, "ERROR: ");
57 vfprintf(stderr, p, ap);
61 void connection_fatal(void *frontend, char *p, ...)
64 fprintf(stderr, "FATAL ERROR: ");
66 vfprintf(stderr, p, ap);
75 void cmdline_error(char *p, ...)
78 fprintf(stderr, "plink: ");
80 vfprintf(stderr, p, ap);
86 HANDLE inhandle, outhandle, errhandle;
87 struct handle *stdin_handle, *stdout_handle, *stderr_handle;
88 DWORD orig_console_mode;
94 static void *backhandle;
97 int term_ldisc(Terminal *term, int mode)
101 void ldisc_update(void *frontend, int echo, int edit)
103 /* Update stdin read mode to reflect changes in line discipline. */
106 mode = ENABLE_PROCESSED_INPUT;
108 mode = mode | ENABLE_ECHO_INPUT;
110 mode = mode & ~ENABLE_ECHO_INPUT;
112 mode = mode | ENABLE_LINE_INPUT;
114 mode = mode & ~ENABLE_LINE_INPUT;
115 SetConsoleMode(inhandle, mode);
118 char *get_ttymode(void *frontend, const char *mode) { return NULL; }
120 int from_backend(void *frontend_handle, int is_stderr,
121 const char *data, int len)
124 handle_write(stderr_handle, data, len);
126 handle_write(stdout_handle, data, len);
129 return handle_backlog(stdout_handle) + handle_backlog(stderr_handle);
132 int from_backend_untrusted(void *frontend_handle, const char *data, int len)
135 * No "untrusted" output should get here (the way the code is
136 * currently, it's all diverted by FLAG_STDERR).
138 assert(!"Unexpected call to from_backend_untrusted()");
139 return 0; /* not reached */
142 int from_backend_eof(void *frontend_handle)
144 handle_write_eof(stdout_handle);
145 return FALSE; /* do not respond to incoming EOF with outgoing */
148 int get_userpass_input(prompts_t *p, unsigned char *in, int inlen)
151 ret = cmdline_get_passwd_input(p, in, inlen);
153 ret = console_get_userpass_input(p, in, inlen);
157 static DWORD main_thread_id;
159 void agent_schedule_callback(void (*callback)(void *, void *, int),
160 void *callback_ctx, void *data, int len)
162 struct agent_callback *c = snew(struct agent_callback);
163 c->callback = callback;
164 c->callback_ctx = callback_ctx;
167 PostThreadMessage(main_thread_id, WM_AGENT_CALLBACK, 0, (LPARAM)c);
171 * Short description of parameters.
173 static void usage(void)
175 printf("PuTTY Link: command-line connection utility\n");
177 printf("Usage: plink [options] [user@]host [command]\n");
178 printf(" (\"host\" can also be a PuTTY saved session name)\n");
179 printf("Options:\n");
180 printf(" -V print version information and exit\n");
181 printf(" -pgpfp print PGP key fingerprints and exit\n");
182 printf(" -v show verbose messages\n");
183 printf(" -load sessname Load settings from saved session\n");
184 printf(" -ssh -telnet -rlogin -raw -serial\n");
185 printf(" force use of a particular protocol\n");
186 printf(" -P port connect to specified port\n");
187 printf(" -l user connect with specified username\n");
188 printf(" -batch disable all interactive prompts\n");
189 printf("The following options only apply to SSH connections:\n");
190 printf(" -pw passw login with specified password\n");
191 printf(" -D [listen-IP:]listen-port\n");
192 printf(" Dynamic SOCKS-based port forwarding\n");
193 printf(" -L [listen-IP:]listen-port:host:port\n");
194 printf(" Forward local port to remote address\n");
195 printf(" -R [listen-IP:]listen-port:host:port\n");
196 printf(" Forward remote port to local address\n");
197 printf(" -X -x enable / disable X11 forwarding\n");
198 printf(" -A -a enable / disable agent forwarding\n");
199 printf(" -t -T enable / disable pty allocation\n");
200 printf(" -1 -2 force use of particular protocol version\n");
201 printf(" -4 -6 force use of IPv4 or IPv6\n");
202 printf(" -C enable compression\n");
203 printf(" -i key private key file for authentication\n");
204 printf(" -noagent disable use of Pageant\n");
205 printf(" -agent enable use of Pageant\n");
206 printf(" -m file read remote command(s) from file\n");
207 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
208 printf(" -N don't start a shell/command (SSH-2 only)\n");
209 printf(" -nc host:port\n");
210 printf(" open tunnel in place of session (SSH-2 only)\n");
211 printf(" -sercfg configuration-string (e.g. 19200,8,n,1,X)\n");
212 printf(" Specify the serial configuration (serial only)\n");
216 static void version(void)
218 printf("plink: %s\n", ver);
222 char *do_select(SOCKET skt, int startup)
226 events = (FD_CONNECT | FD_READ | FD_WRITE |
227 FD_OOB | FD_CLOSE | FD_ACCEPT);
231 if (p_WSAEventSelect(skt, netevent, events) == SOCKET_ERROR) {
232 switch (p_WSAGetLastError()) {
234 return "Network is down";
236 return "WSAEventSelect(): unknown error";
242 int stdin_gotdata(struct handle *h, void *data, int len)
246 * Special case: report read error.
249 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, -len, 0,
250 buf, lenof(buf), NULL);
251 buf[lenof(buf)-1] = '\0';
252 if (buf[strlen(buf)-1] == '\n')
253 buf[strlen(buf)-1] = '\0';
254 fprintf(stderr, "Unable to read from standard input: %s\n", buf);
257 noise_ultralight(len);
258 if (connopen && back->connected(backhandle)) {
260 return back->send(backhandle, data, len);
262 back->special(backhandle, TS_EOF);
269 void stdouterr_sent(struct handle *h, int new_backlog)
271 if (new_backlog < 0) {
273 * Special case: report write error.
276 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, -new_backlog, 0,
277 buf, lenof(buf), NULL);
278 buf[lenof(buf)-1] = '\0';
279 if (buf[strlen(buf)-1] == '\n')
280 buf[strlen(buf)-1] = '\0';
281 fprintf(stderr, "Unable to write to standard %s: %s\n",
282 (h == stdout_handle ? "output" : "error"), buf);
285 if (connopen && back->connected(backhandle)) {
286 back->unthrottle(backhandle, (handle_backlog(stdout_handle) +
287 handle_backlog(stderr_handle)));
291 const int share_can_be_downstream = TRUE;
292 const int share_can_be_upstream = TRUE;
294 int main(int argc, char **argv)
302 int got_host = FALSE;
303 int use_subsystem = 0;
304 unsigned long now, next, then;
307 skcount = sksize = 0;
309 * Initialise port and protocol to sensible defaults. (These
310 * will be overridden by more or less anything.)
312 default_protocol = PROT_SSH;
317 * Process the command line.
320 do_defaults(NULL, conf);
321 loaded_session = FALSE;
322 default_protocol = conf_get_int(conf, CONF_protocol);
323 default_port = conf_get_int(conf, CONF_port);
327 * Override the default protocol if PLINK_PROTOCOL is set.
329 char *p = getenv("PLINK_PROTOCOL");
331 const Backend *b = backend_from_name(p);
333 default_protocol = b->protocol;
334 default_port = b->default_port;
335 conf_set_int(conf, CONF_protocol, default_protocol);
336 conf_set_int(conf, CONF_port, default_port);
343 int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
347 "plink: option \"%s\" requires an argument\n", p);
349 } else if (ret == 2) {
351 } else if (ret == 1) {
353 } else if (!strcmp(p, "-batch")) {
354 console_batch_mode = 1;
355 } else if (!strcmp(p, "-s")) {
356 /* Save status to write to conf later. */
358 } else if (!strcmp(p, "-V") || !strcmp(p, "--version")) {
360 } else if (!strcmp(p, "--help")) {
362 } else if (!strcmp(p, "-pgpfp")) {
366 fprintf(stderr, "plink: unknown option \"%s\"\n", p);
370 if (!conf_launchable(conf) || !(got_host || loaded_session)) {
373 * If the hostname starts with "telnet:", set the
374 * protocol to Telnet and process the string as a
377 if (!strncmp(q, "telnet:", 7)) {
381 if (q[0] == '/' && q[1] == '/')
383 conf_set_int(conf, CONF_protocol, PROT_TELNET);
385 p += host_strcspn(p, ":/");
390 conf_set_int(conf, CONF_port, atoi(p));
392 conf_set_int(conf, CONF_port, -1);
393 conf_set_str(conf, CONF_host, q);
396 char *r, *user, *host;
398 * Before we process the [user@]host string, we
399 * first check for the presence of a protocol
400 * prefix (a protocol name followed by ",").
406 b = backend_from_name(p);
408 default_protocol = b->protocol;
409 conf_set_int(conf, CONF_protocol,
411 portnumber = b->default_port;
417 * A nonzero length string followed by an @ is treated
418 * as a username. (We discount an _initial_ @.) The
419 * rest of the string (or the whole string if no @)
420 * is treated as a session name and/or hostname.
424 p++, r = NULL; /* discount initial @ */
429 user = NULL, host = p;
433 * Now attempt to load a saved session with the
434 * same name as the hostname.
437 Conf *conf2 = conf_new();
438 do_defaults(host, conf2);
439 if (loaded_session || !conf_launchable(conf2)) {
440 /* No settings for this host; use defaults */
441 /* (or session was already loaded with -load) */
442 conf_set_str(conf, CONF_host, host);
443 conf_set_int(conf, CONF_port, default_port);
446 conf_copy_into(conf, conf2);
447 loaded_session = TRUE;
453 /* Patch in specified username. */
454 conf_set_str(conf, CONF_username, user);
461 cmdlen = cmdsize = 0;
466 if (cmdlen >= cmdsize) {
467 cmdsize = cmdlen + 512;
468 command = sresize(command, cmdsize, char);
470 command[cmdlen++]=*p++;
472 if (cmdlen >= cmdsize) {
473 cmdsize = cmdlen + 512;
474 command = sresize(command, cmdsize, char);
476 command[cmdlen++]=' '; /* always add trailing space */
477 if (--argc) p = *++argv;
479 if (cmdlen) command[--cmdlen]='\0';
480 /* change trailing blank to NUL */
481 conf_set_str(conf, CONF_remote_cmd, command);
482 conf_set_str(conf, CONF_remote_cmd2, "");
483 conf_set_int(conf, CONF_nopty, TRUE); /* command => no tty */
485 break; /* done with cmdline */
493 if (!conf_launchable(conf) || !(got_host || loaded_session)) {
498 * Muck about with the hostname in various ways.
501 char *hostbuf = dupstr(conf_get_str(conf, CONF_host));
502 char *host = hostbuf;
506 * Trim leading whitespace.
508 host += strspn(host, " \t");
511 * See if host is of the form user@host, and separate out
512 * the username if so.
514 if (host[0] != '\0') {
515 char *atsign = strrchr(host, '@');
518 conf_set_str(conf, CONF_username, host);
524 * Trim off a colon suffix if it's there.
526 host[host_strcspn(host, ":")] = '\0';
529 * Remove any remaining whitespace.
534 if (*q != ' ' && *q != '\t')
540 conf_set_str(conf, CONF_host, hostbuf);
545 * Perform command-line overrides on session configuration.
547 cmdline_run_saved(conf);
550 * Apply subsystem status.
553 conf_set_int(conf, CONF_ssh_subsys, TRUE);
555 if (!*conf_get_str(conf, CONF_remote_cmd) &&
556 !*conf_get_str(conf, CONF_remote_cmd2) &&
557 !*conf_get_str(conf, CONF_ssh_nc_host))
558 flags |= FLAG_INTERACTIVE;
561 * Select protocol. This is farmed out into a table in a
562 * separate file to enable an ssh-free variant.
564 back = backend_from_proto(conf_get_int(conf, CONF_protocol));
567 "Internal fault: Unsupported protocol found\n");
574 if (portnumber != -1)
575 conf_set_int(conf, CONF_port, portnumber);
578 if (p_WSAEventSelect == NULL) {
579 fprintf(stderr, "Plink requires WinSock 2\n");
583 logctx = log_init(NULL, conf);
584 console_provide_logctx(logctx);
587 * Start up the connection.
589 netevent = CreateEvent(NULL, FALSE, FALSE, NULL);
593 /* nodelay is only useful if stdin is a character device (console) */
594 int nodelay = conf_get_int(conf, CONF_tcp_nodelay) &&
595 (GetFileType(GetStdHandle(STD_INPUT_HANDLE)) == FILE_TYPE_CHAR);
597 error = back->init(NULL, &backhandle, conf,
598 conf_get_str(conf, CONF_host),
599 conf_get_int(conf, CONF_port),
601 conf_get_int(conf, CONF_tcp_keepalives));
603 fprintf(stderr, "Unable to open connection:\n%s", error);
606 back->provide_logctx(backhandle, logctx);
611 inhandle = GetStdHandle(STD_INPUT_HANDLE);
612 outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
613 errhandle = GetStdHandle(STD_ERROR_HANDLE);
616 * Turn off ECHO and LINE input modes. We don't care if this
617 * call fails, because we know we aren't necessarily running in
620 GetConsoleMode(inhandle, &orig_console_mode);
621 SetConsoleMode(inhandle, ENABLE_PROCESSED_INPUT);
624 * Pass the output handles to the handle-handling subsystem.
625 * (The input one we leave until we're through the
626 * authentication process.)
628 stdout_handle = handle_output_new(outhandle, stdouterr_sent, NULL, 0);
629 stderr_handle = handle_output_new(errhandle, stdouterr_sent, NULL, 0);
631 main_thread_id = GetCurrentThreadId();
635 now = GETTICKCOUNT();
643 if (!sending && back->sendok(backhandle)) {
644 stdin_handle = handle_input_new(inhandle, stdin_gotdata, NULL,
649 if (toplevel_callback_pending()) {
651 } else if (run_timers(now, &next)) {
653 now = GETTICKCOUNT();
654 if (now - then > next - then)
662 handles = handle_get_events(&nhandles);
663 handles = sresize(handles, nhandles+1, HANDLE);
664 handles[nhandles] = netevent;
665 n = MsgWaitForMultipleObjects(nhandles+1, handles, FALSE, ticks,
667 if ((unsigned)(n - WAIT_OBJECT_0) < (unsigned)nhandles) {
668 handle_got_event(handles[n - WAIT_OBJECT_0]);
669 } else if (n == WAIT_OBJECT_0 + nhandles) {
670 WSANETWORKEVENTS things;
672 extern SOCKET first_socket(int *), next_socket(int *);
673 extern int select_result(WPARAM, LPARAM);
677 * We must not call select_result() for any socket
678 * until we have finished enumerating within the tree.
679 * This is because select_result() may close the socket
680 * and modify the tree.
682 /* Count the active sockets. */
684 for (socket = first_socket(&socketstate);
685 socket != INVALID_SOCKET;
686 socket = next_socket(&socketstate)) i++;
688 /* Expand the buffer if necessary. */
691 sklist = sresize(sklist, sksize, SOCKET);
694 /* Retrieve the sockets into sklist. */
696 for (socket = first_socket(&socketstate);
697 socket != INVALID_SOCKET;
698 socket = next_socket(&socketstate)) {
699 sklist[skcount++] = socket;
702 /* Now we're done enumerating; go through the list. */
703 for (i = 0; i < skcount; i++) {
706 wp = (WPARAM) socket;
707 if (!p_WSAEnumNetworkEvents(socket, NULL, &things)) {
708 static const struct { int bit, mask; } eventtypes[] = {
709 {FD_CONNECT_BIT, FD_CONNECT},
710 {FD_READ_BIT, FD_READ},
711 {FD_CLOSE_BIT, FD_CLOSE},
712 {FD_OOB_BIT, FD_OOB},
713 {FD_WRITE_BIT, FD_WRITE},
714 {FD_ACCEPT_BIT, FD_ACCEPT},
718 noise_ultralight(socket);
719 noise_ultralight(things.lNetworkEvents);
721 for (e = 0; e < lenof(eventtypes); e++)
722 if (things.lNetworkEvents & eventtypes[e].mask) {
724 int err = things.iErrorCode[eventtypes[e].bit];
725 lp = WSAMAKESELECTREPLY(eventtypes[e].mask, err);
726 connopen &= select_result(wp, lp);
730 } else if (n == WAIT_OBJECT_0 + nhandles + 1) {
732 while (PeekMessage(&msg, INVALID_HANDLE_VALUE,
733 WM_AGENT_CALLBACK, WM_AGENT_CALLBACK,
735 struct agent_callback *c = (struct agent_callback *)msg.lParam;
736 c->callback(c->callback_ctx, c->data, c->len);
741 run_toplevel_callbacks();
743 if (n == WAIT_TIMEOUT) {
746 now = GETTICKCOUNT();
752 handle_unthrottle(stdin_handle, back->sendbuffer(backhandle));
754 if ((!connopen || !back->connected(backhandle)) &&
755 handle_backlog(stdout_handle) + handle_backlog(stderr_handle) == 0)
756 break; /* we closed the connection */
758 exitcode = back->exitcode(backhandle);
760 fprintf(stderr, "Remote process exit code unavailable\n");
761 exitcode = 1; /* this is an error condition */
763 cleanup_exit(exitcode);
764 return 0; /* placate compiler warning */