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Initial commit of GSSAPI Kerberos support.
[u/mdw/putty] / unix / uxplink.c
1 /*
2 * PLink - a command-line (stdin/stdout) variant of PuTTY.
3 */
4
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <errno.h>
8 #include <assert.h>
9 #include <stdarg.h>
10 #include <signal.h>
11 #include <unistd.h>
12 #include <fcntl.h>
13 #include <termios.h>
14 #include <pwd.h>
15 #include <sys/ioctl.h>
16 #include <sys/time.h>
17 #ifndef HAVE_NO_SYS_SELECT_H
18 #include <sys/select.h>
19 #endif
20
21 #define PUTTY_DO_GLOBALS /* actually _define_ globals */
22 #include "putty.h"
23 #include "storage.h"
24 #include "tree234.h"
25
26 #define MAX_STDIN_BACKLOG 4096
27
28 void *logctx;
29
30 static struct termios orig_termios;
31
32 void fatalbox(char *p, ...)
33 {
34 struct termios cf;
35 va_list ap;
36 premsg(&cf);
37 fprintf(stderr, "FATAL ERROR: ");
38 va_start(ap, p);
39 vfprintf(stderr, p, ap);
40 va_end(ap);
41 fputc('\n', stderr);
42 postmsg(&cf);
43 if (logctx) {
44 log_free(logctx);
45 logctx = NULL;
46 }
47 cleanup_exit(1);
48 }
49 void modalfatalbox(char *p, ...)
50 {
51 struct termios cf;
52 va_list ap;
53 premsg(&cf);
54 fprintf(stderr, "FATAL ERROR: ");
55 va_start(ap, p);
56 vfprintf(stderr, p, ap);
57 va_end(ap);
58 fputc('\n', stderr);
59 postmsg(&cf);
60 if (logctx) {
61 log_free(logctx);
62 logctx = NULL;
63 }
64 cleanup_exit(1);
65 }
66 void connection_fatal(void *frontend, char *p, ...)
67 {
68 struct termios cf;
69 va_list ap;
70 premsg(&cf);
71 fprintf(stderr, "FATAL ERROR: ");
72 va_start(ap, p);
73 vfprintf(stderr, p, ap);
74 va_end(ap);
75 fputc('\n', stderr);
76 postmsg(&cf);
77 if (logctx) {
78 log_free(logctx);
79 logctx = NULL;
80 }
81 cleanup_exit(1);
82 }
83 void cmdline_error(char *p, ...)
84 {
85 struct termios cf;
86 va_list ap;
87 premsg(&cf);
88 fprintf(stderr, "plink: ");
89 va_start(ap, p);
90 vfprintf(stderr, p, ap);
91 va_end(ap);
92 fputc('\n', stderr);
93 postmsg(&cf);
94 exit(1);
95 }
96
97 static int local_tty = FALSE; /* do we have a local tty? */
98
99 static Backend *back;
100 static void *backhandle;
101 static Config cfg;
102
103 /*
104 * Default settings that are specific to pterm.
105 */
106 char *platform_default_s(const char *name)
107 {
108 if (!strcmp(name, "TermType"))
109 return dupstr(getenv("TERM"));
110 if (!strcmp(name, "UserName"))
111 return get_username();
112 if (!strcmp(name, "SerialLine"))
113 return dupstr("/dev/ttyS0");
114 return NULL;
115 }
116
117 int platform_default_i(const char *name, int def)
118 {
119 if (!strcmp(name, "TermWidth") ||
120 !strcmp(name, "TermHeight")) {
121 struct winsize size;
122 if (ioctl(STDIN_FILENO, TIOCGWINSZ, (void *)&size) >= 0)
123 return (!strcmp(name, "TermWidth") ? size.ws_col : size.ws_row);
124 }
125 return def;
126 }
127
128 FontSpec platform_default_fontspec(const char *name)
129 {
130 FontSpec ret;
131 *ret.name = '\0';
132 return ret;
133 }
134
135 Filename platform_default_filename(const char *name)
136 {
137 Filename ret;
138 if (!strcmp(name, "LogFileName"))
139 strcpy(ret.path, "putty.log");
140 else
141 *ret.path = '\0';
142 return ret;
143 }
144
145 char *x_get_default(const char *key)
146 {
147 return NULL; /* this is a stub */
148 }
149 int term_ldisc(Terminal *term, int mode)
150 {
151 return FALSE;
152 }
153 void ldisc_update(void *frontend, int echo, int edit)
154 {
155 /* Update stdin read mode to reflect changes in line discipline. */
156 struct termios mode;
157
158 if (!local_tty) return;
159
160 mode = orig_termios;
161
162 if (echo)
163 mode.c_lflag |= ECHO;
164 else
165 mode.c_lflag &= ~ECHO;
166
167 if (edit) {
168 mode.c_iflag |= ICRNL;
169 mode.c_lflag |= ISIG | ICANON;
170 mode.c_oflag |= OPOST;
171 } else {
172 mode.c_iflag &= ~ICRNL;
173 mode.c_lflag &= ~(ISIG | ICANON);
174 mode.c_oflag &= ~OPOST;
175 /* Solaris sets these to unhelpful values */
176 mode.c_cc[VMIN] = 1;
177 mode.c_cc[VTIME] = 0;
178 /* FIXME: perhaps what we do with IXON/IXOFF should be an
179 * argument to ldisc_update(), to allow implementation of SSH-2
180 * "xon-xoff" and Rlogin's equivalent? */
181 mode.c_iflag &= ~IXON;
182 mode.c_iflag &= ~IXOFF;
183 }
184 /*
185 * Mark parity errors and (more important) BREAK on input. This
186 * is more complex than it need be because POSIX-2001 suggests
187 * that escaping of valid 0xff in the input stream is dependent on
188 * IGNPAR being clear even though marking of BREAK isn't. NetBSD
189 * 2.0 goes one worse and makes it dependent on INPCK too. We
190 * deal with this by forcing these flags into a useful state and
191 * then faking the state in which we found them in from_tty() if
192 * we get passed a parity or framing error.
193 */
194 mode.c_iflag = (mode.c_iflag | INPCK | PARMRK) & ~IGNPAR;
195
196 tcsetattr(STDIN_FILENO, TCSANOW, &mode);
197 }
198
199 /* Helper function to extract a special character from a termios. */
200 static char *get_ttychar(struct termios *t, int index)
201 {
202 cc_t c = t->c_cc[index];
203 #if defined(_POSIX_VDISABLE)
204 if (c == _POSIX_VDISABLE)
205 return dupprintf("");
206 #endif
207 return dupprintf("^<%d>", c);
208 }
209
210 char *get_ttymode(void *frontend, const char *mode)
211 {
212 /*
213 * Propagate appropriate terminal modes from the local terminal,
214 * if any.
215 */
216 if (!local_tty) return NULL;
217
218 #define GET_CHAR(ourname, uxname) \
219 do { \
220 if (strcmp(mode, ourname) == 0) \
221 return get_ttychar(&orig_termios, uxname); \
222 } while(0)
223 #define GET_BOOL(ourname, uxname, uxmemb, transform) \
224 do { \
225 if (strcmp(mode, ourname) == 0) { \
226 int b = (orig_termios.uxmemb & uxname) != 0; \
227 transform; \
228 return dupprintf("%d", b); \
229 } \
230 } while (0)
231
232 /*
233 * Modes that want to be the same on all terminal devices involved.
234 */
235 /* All the special characters supported by SSH */
236 #if defined(VINTR)
237 GET_CHAR("INTR", VINTR);
238 #endif
239 #if defined(VQUIT)
240 GET_CHAR("QUIT", VQUIT);
241 #endif
242 #if defined(VERASE)
243 GET_CHAR("ERASE", VERASE);
244 #endif
245 #if defined(VKILL)
246 GET_CHAR("KILL", VKILL);
247 #endif
248 #if defined(VEOF)
249 GET_CHAR("EOF", VEOF);
250 #endif
251 #if defined(VEOL)
252 GET_CHAR("EOL", VEOL);
253 #endif
254 #if defined(VEOL2)
255 GET_CHAR("EOL2", VEOL2);
256 #endif
257 #if defined(VSTART)
258 GET_CHAR("START", VSTART);
259 #endif
260 #if defined(VSTOP)
261 GET_CHAR("STOP", VSTOP);
262 #endif
263 #if defined(VSUSP)
264 GET_CHAR("SUSP", VSUSP);
265 #endif
266 #if defined(VDSUSP)
267 GET_CHAR("DSUSP", VDSUSP);
268 #endif
269 #if defined(VREPRINT)
270 GET_CHAR("REPRINT", VREPRINT);
271 #endif
272 #if defined(VWERASE)
273 GET_CHAR("WERASE", VWERASE);
274 #endif
275 #if defined(VLNEXT)
276 GET_CHAR("LNEXT", VLNEXT);
277 #endif
278 #if defined(VFLUSH)
279 GET_CHAR("FLUSH", VFLUSH);
280 #endif
281 #if defined(VSWTCH)
282 GET_CHAR("SWTCH", VSWTCH);
283 #endif
284 #if defined(VSTATUS)
285 GET_CHAR("STATUS", VSTATUS);
286 #endif
287 #if defined(VDISCARD)
288 GET_CHAR("DISCARD", VDISCARD);
289 #endif
290 /* Modes that "configure" other major modes. These should probably be
291 * considered as user preferences. */
292 /* Configuration of ICANON */
293 #if defined(ECHOK)
294 GET_BOOL("ECHOK", ECHOK, c_lflag, );
295 #endif
296 #if defined(ECHOKE)
297 GET_BOOL("ECHOKE", ECHOKE, c_lflag, );
298 #endif
299 #if defined(ECHOE)
300 GET_BOOL("ECHOE", ECHOE, c_lflag, );
301 #endif
302 #if defined(ECHONL)
303 GET_BOOL("ECHONL", ECHONL, c_lflag, );
304 #endif
305 #if defined(XCASE)
306 GET_BOOL("XCASE", XCASE, c_lflag, );
307 #endif
308 /* Configuration of ECHO */
309 #if defined(ECHOCTL)
310 GET_BOOL("ECHOCTL", ECHOCTL, c_lflag, );
311 #endif
312 /* Configuration of IXON/IXOFF */
313 #if defined(IXANY)
314 GET_BOOL("IXANY", IXANY, c_iflag, );
315 #endif
316 /* Configuration of OPOST */
317 #if defined(OLCUC)
318 GET_BOOL("OLCUC", OLCUC, c_oflag, );
319 #endif
320 #if defined(ONLCR)
321 GET_BOOL("ONLCR", ONLCR, c_oflag, );
322 #endif
323 #if defined(OCRNL)
324 GET_BOOL("OCRNL", OCRNL, c_oflag, );
325 #endif
326 #if defined(ONOCR)
327 GET_BOOL("ONOCR", ONOCR, c_oflag, );
328 #endif
329 #if defined(ONLRET)
330 GET_BOOL("ONLRET", ONLRET, c_oflag, );
331 #endif
332
333 /*
334 * Modes that want to be set in only one place, and that we have
335 * squashed locally.
336 */
337 #if defined(ISIG)
338 GET_BOOL("ISIG", ISIG, c_lflag, );
339 #endif
340 #if defined(ICANON)
341 GET_BOOL("ICANON", ICANON, c_lflag, );
342 #endif
343 #if defined(ECHO)
344 GET_BOOL("ECHO", ECHO, c_lflag, );
345 #endif
346 #if defined(IXON)
347 GET_BOOL("IXON", IXON, c_iflag, );
348 #endif
349 #if defined(IXOFF)
350 GET_BOOL("IXOFF", IXOFF, c_iflag, );
351 #endif
352 #if defined(OPOST)
353 GET_BOOL("OPOST", OPOST, c_oflag, );
354 #endif
355
356 /*
357 * We do not propagate the following modes:
358 * - Parity/serial settings, which are a local affair and don't
359 * make sense propagated over SSH's 8-bit byte-stream.
360 * IGNPAR PARMRK INPCK CS7 CS8 PARENB PARODD
361 * - Things that want to be enabled in one place that we don't
362 * squash locally.
363 * IUCLC
364 * - Status bits.
365 * PENDIN
366 * - Things I don't know what to do with. (FIXME)
367 * ISTRIP IMAXBEL NOFLSH TOSTOP IEXTEN
368 * INLCR IGNCR ICRNL
369 */
370
371 #undef GET_CHAR
372 #undef GET_BOOL
373
374 /* Fall through to here for unrecognised names, or ones that are
375 * unsupported on this platform */
376 return NULL;
377 }
378
379 void cleanup_termios(void)
380 {
381 if (local_tty)
382 tcsetattr(STDIN_FILENO, TCSANOW, &orig_termios);
383 }
384
385 bufchain stdout_data, stderr_data;
386
387 int try_output(int is_stderr)
388 {
389 bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
390 int fd = (is_stderr ? STDERR_FILENO : STDOUT_FILENO);
391 void *senddata;
392 int sendlen, ret, fl;
393
394 if (bufchain_size(chain) == 0)
395 return bufchain_size(&stdout_data) + bufchain_size(&stderr_data);
396
397 fl = fcntl(fd, F_GETFL);
398 if (fl != -1 && !(fl & O_NONBLOCK))
399 fcntl(fd, F_SETFL, fl | O_NONBLOCK);
400 do {
401 bufchain_prefix(chain, &senddata, &sendlen);
402 ret = write(fd, senddata, sendlen);
403 if (ret > 0)
404 bufchain_consume(chain, ret);
405 } while (ret == sendlen && bufchain_size(chain) != 0);
406 if (fl != -1 && !(fl & O_NONBLOCK))
407 fcntl(fd, F_SETFL, fl);
408 if (ret < 0 && errno != EAGAIN) {
409 perror(is_stderr ? "stderr: write" : "stdout: write");
410 exit(1);
411 }
412 return bufchain_size(&stdout_data) + bufchain_size(&stderr_data);
413 }
414
415 int from_backend(void *frontend_handle, int is_stderr,
416 const char *data, int len)
417 {
418 if (is_stderr) {
419 bufchain_add(&stderr_data, data, len);
420 return try_output(TRUE);
421 } else {
422 bufchain_add(&stdout_data, data, len);
423 return try_output(FALSE);
424 }
425 }
426
427 int from_backend_untrusted(void *frontend_handle, const char *data, int len)
428 {
429 /*
430 * No "untrusted" output should get here (the way the code is
431 * currently, it's all diverted by FLAG_STDERR).
432 */
433 assert(!"Unexpected call to from_backend_untrusted()");
434 return 0; /* not reached */
435 }
436
437 int get_userpass_input(prompts_t *p, unsigned char *in, int inlen)
438 {
439 int ret;
440 ret = cmdline_get_passwd_input(p, in, inlen);
441 if (ret == -1)
442 ret = console_get_userpass_input(p, in, inlen);
443 return ret;
444 }
445
446 /*
447 * Handle data from a local tty in PARMRK format.
448 */
449 static void from_tty(void *vbuf, unsigned len)
450 {
451 char *p, *q, *end, *buf = vbuf;
452 static enum {NORMAL, FF, FF00} state = NORMAL;
453
454 p = buf; end = buf + len;
455 while (p < end) {
456 switch (state) {
457 case NORMAL:
458 if (*p == '\xff') {
459 p++;
460 state = FF;
461 } else {
462 q = memchr(p, '\xff', end - p);
463 if (q == NULL) q = end;
464 back->send(backhandle, p, q - p);
465 p = q;
466 }
467 break;
468 case FF:
469 if (*p == '\xff') {
470 back->send(backhandle, p, 1);
471 p++;
472 state = NORMAL;
473 } else if (*p == '\0') {
474 p++;
475 state = FF00;
476 } else abort();
477 break;
478 case FF00:
479 if (*p == '\0') {
480 back->special(backhandle, TS_BRK);
481 } else {
482 /*
483 * Pretend that PARMRK wasn't set. This involves
484 * faking what INPCK and IGNPAR would have done if
485 * we hadn't overridden them. Unfortunately, we
486 * can't do this entirely correctly because INPCK
487 * distinguishes between framing and parity
488 * errors, but PARMRK format represents both in
489 * the same way. We assume that parity errors are
490 * more common than framing errors, and hence
491 * treat all input errors as being subject to
492 * INPCK.
493 */
494 if (orig_termios.c_iflag & INPCK) {
495 /* If IGNPAR is set, we throw away the character. */
496 if (!(orig_termios.c_iflag & IGNPAR)) {
497 /* PE/FE get passed on as NUL. */
498 *p = 0;
499 back->send(backhandle, p, 1);
500 }
501 } else {
502 /* INPCK not set. Assume we got a parity error. */
503 back->send(backhandle, p, 1);
504 }
505 }
506 p++;
507 state = NORMAL;
508 }
509 }
510 }
511
512 int signalpipe[2];
513
514 void sigwinch(int signum)
515 {
516 write(signalpipe[1], "x", 1);
517 }
518
519 /*
520 * In Plink our selects are synchronous, so these functions are
521 * empty stubs.
522 */
523 int uxsel_input_add(int fd, int rwx) { return 0; }
524 void uxsel_input_remove(int id) { }
525
526 /*
527 * Short description of parameters.
528 */
529 static void usage(void)
530 {
531 printf("PuTTY Link: command-line connection utility\n");
532 printf("%s\n", ver);
533 printf("Usage: plink [options] [user@]host [command]\n");
534 printf(" (\"host\" can also be a PuTTY saved session name)\n");
535 printf("Options:\n");
536 printf(" -V print version information and exit\n");
537 printf(" -pgpfp print PGP key fingerprints and exit\n");
538 printf(" -v show verbose messages\n");
539 printf(" -load sessname Load settings from saved session\n");
540 printf(" -ssh -telnet -rlogin -raw\n");
541 printf(" force use of a particular protocol\n");
542 printf(" -P port connect to specified port\n");
543 printf(" -l user connect with specified username\n");
544 printf(" -batch disable all interactive prompts\n");
545 printf("The following options only apply to SSH connections:\n");
546 printf(" -pw passw login with specified password\n");
547 printf(" -D [listen-IP:]listen-port\n");
548 printf(" Dynamic SOCKS-based port forwarding\n");
549 printf(" -L [listen-IP:]listen-port:host:port\n");
550 printf(" Forward local port to remote address\n");
551 printf(" -R [listen-IP:]listen-port:host:port\n");
552 printf(" Forward remote port to local address\n");
553 printf(" -X -x enable / disable X11 forwarding\n");
554 printf(" -A -a enable / disable agent forwarding\n");
555 printf(" -t -T enable / disable pty allocation\n");
556 printf(" -1 -2 force use of particular protocol version\n");
557 printf(" -4 -6 force use of IPv4 or IPv6\n");
558 printf(" -C enable compression\n");
559 printf(" -i key private key file for authentication\n");
560 printf(" -noagent disable use of Pageant\n");
561 printf(" -agent enable use of Pageant\n");
562 printf(" -m file read remote command(s) from file\n");
563 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
564 printf(" -N don't start a shell/command (SSH-2 only)\n");
565 printf(" -nc host:port\n");
566 printf(" open tunnel in place of session (SSH-2 only)\n");
567 exit(1);
568 }
569
570 static void version(void)
571 {
572 printf("plink: %s\n", ver);
573 exit(1);
574 }
575
576 int main(int argc, char **argv)
577 {
578 int sending;
579 int portnumber = -1;
580 int *fdlist;
581 int fd;
582 int i, fdcount, fdsize, fdstate;
583 int connopen;
584 int exitcode;
585 int errors;
586 int use_subsystem = 0;
587 void *ldisc;
588 long now;
589
590 fdlist = NULL;
591 fdcount = fdsize = 0;
592 /*
593 * Initialise port and protocol to sensible defaults. (These
594 * will be overridden by more or less anything.)
595 */
596 default_protocol = PROT_SSH;
597 default_port = 22;
598
599 flags = FLAG_STDERR | FLAG_STDERR_TTY;
600
601 stderr_tty_init();
602 /*
603 * Process the command line.
604 */
605 do_defaults(NULL, &cfg);
606 loaded_session = FALSE;
607 default_protocol = cfg.protocol;
608 default_port = cfg.port;
609 errors = 0;
610 {
611 /*
612 * Override the default protocol if PLINK_PROTOCOL is set.
613 */
614 char *p = getenv("PLINK_PROTOCOL");
615 if (p) {
616 const Backend *b = backend_from_name(p);
617 if (b) {
618 default_protocol = cfg.protocol = b->protocol;
619 default_port = cfg.port = b->default_port;
620 }
621 }
622 }
623 while (--argc) {
624 char *p = *++argv;
625 if (*p == '-') {
626 int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
627 1, &cfg);
628 if (ret == -2) {
629 fprintf(stderr,
630 "plink: option \"%s\" requires an argument\n", p);
631 errors = 1;
632 } else if (ret == 2) {
633 --argc, ++argv;
634 } else if (ret == 1) {
635 continue;
636 } else if (!strcmp(p, "-batch")) {
637 console_batch_mode = 1;
638 } else if (!strcmp(p, "-s")) {
639 /* Save status to write to cfg later. */
640 use_subsystem = 1;
641 } else if (!strcmp(p, "-V")) {
642 version();
643 } else if (!strcmp(p, "-pgpfp")) {
644 pgp_fingerprints();
645 exit(1);
646 } else if (!strcmp(p, "-o")) {
647 if (argc <= 1) {
648 fprintf(stderr,
649 "plink: option \"-o\" requires an argument\n");
650 errors = 1;
651 } else {
652 --argc;
653 provide_xrm_string(*++argv);
654 }
655 } else {
656 fprintf(stderr, "plink: unknown option \"%s\"\n", p);
657 errors = 1;
658 }
659 } else if (*p) {
660 if (!cfg_launchable(&cfg)) {
661 char *q = p;
662
663 /*
664 * If the hostname starts with "telnet:", set the
665 * protocol to Telnet and process the string as a
666 * Telnet URL.
667 */
668 if (!strncmp(q, "telnet:", 7)) {
669 char c;
670
671 q += 7;
672 if (q[0] == '/' && q[1] == '/')
673 q += 2;
674 cfg.protocol = PROT_TELNET;
675 p = q;
676 while (*p && *p != ':' && *p != '/')
677 p++;
678 c = *p;
679 if (*p)
680 *p++ = '\0';
681 if (c == ':')
682 cfg.port = atoi(p);
683 else
684 cfg.port = -1;
685 strncpy(cfg.host, q, sizeof(cfg.host) - 1);
686 cfg.host[sizeof(cfg.host) - 1] = '\0';
687 } else {
688 char *r, *user, *host;
689 /*
690 * Before we process the [user@]host string, we
691 * first check for the presence of a protocol
692 * prefix (a protocol name followed by ",").
693 */
694 r = strchr(p, ',');
695 if (r) {
696 const Backend *b;
697 *r = '\0';
698 b = backend_from_name(p);
699 if (b) {
700 default_protocol = cfg.protocol = b->protocol;
701 portnumber = b->default_port;
702 }
703 p = r + 1;
704 }
705
706 /*
707 * A nonzero length string followed by an @ is treated
708 * as a username. (We discount an _initial_ @.) The
709 * rest of the string (or the whole string if no @)
710 * is treated as a session name and/or hostname.
711 */
712 r = strrchr(p, '@');
713 if (r == p)
714 p++, r = NULL; /* discount initial @ */
715 if (r) {
716 *r++ = '\0';
717 user = p, host = r;
718 } else {
719 user = NULL, host = p;
720 }
721
722 /*
723 * Now attempt to load a saved session with the
724 * same name as the hostname.
725 */
726 {
727 Config cfg2;
728 do_defaults(host, &cfg2);
729 if (loaded_session || !cfg_launchable(&cfg2)) {
730 /* No settings for this host; use defaults */
731 /* (or session was already loaded with -load) */
732 strncpy(cfg.host, host, sizeof(cfg.host) - 1);
733 cfg.host[sizeof(cfg.host) - 1] = '\0';
734 cfg.port = default_port;
735 } else {
736 cfg = cfg2;
737 }
738 }
739
740 if (user) {
741 /* Patch in specified username. */
742 strncpy(cfg.username, user,
743 sizeof(cfg.username) - 1);
744 cfg.username[sizeof(cfg.username) - 1] = '\0';
745 }
746
747 }
748 } else {
749 char *command;
750 int cmdlen, cmdsize;
751 cmdlen = cmdsize = 0;
752 command = NULL;
753
754 while (argc) {
755 while (*p) {
756 if (cmdlen >= cmdsize) {
757 cmdsize = cmdlen + 512;
758 command = sresize(command, cmdsize, char);
759 }
760 command[cmdlen++]=*p++;
761 }
762 if (cmdlen >= cmdsize) {
763 cmdsize = cmdlen + 512;
764 command = sresize(command, cmdsize, char);
765 }
766 command[cmdlen++]=' '; /* always add trailing space */
767 if (--argc) p = *++argv;
768 }
769 if (cmdlen) command[--cmdlen]='\0';
770 /* change trailing blank to NUL */
771 cfg.remote_cmd_ptr = command;
772 cfg.remote_cmd_ptr2 = NULL;
773 cfg.nopty = TRUE; /* command => no terminal */
774
775 break; /* done with cmdline */
776 }
777 }
778 }
779
780 if (errors)
781 return 1;
782
783 if (!cfg_launchable(&cfg)) {
784 usage();
785 }
786
787 /*
788 * Trim leading whitespace off the hostname if it's there.
789 */
790 {
791 int space = strspn(cfg.host, " \t");
792 memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
793 }
794
795 /* See if host is of the form user@host */
796 if (cfg.host[0] != '\0') {
797 char *atsign = strrchr(cfg.host, '@');
798 /* Make sure we're not overflowing the user field */
799 if (atsign) {
800 if (atsign - cfg.host < sizeof cfg.username) {
801 strncpy(cfg.username, cfg.host, atsign - cfg.host);
802 cfg.username[atsign - cfg.host] = '\0';
803 }
804 memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
805 }
806 }
807
808 /*
809 * Perform command-line overrides on session configuration.
810 */
811 cmdline_run_saved(&cfg);
812
813 /*
814 * Apply subsystem status.
815 */
816 if (use_subsystem)
817 cfg.ssh_subsys = TRUE;
818
819 /*
820 * Trim a colon suffix off the hostname if it's there.
821 */
822 cfg.host[strcspn(cfg.host, ":")] = '\0';
823
824 /*
825 * Remove any remaining whitespace from the hostname.
826 */
827 {
828 int p1 = 0, p2 = 0;
829 while (cfg.host[p2] != '\0') {
830 if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
831 cfg.host[p1] = cfg.host[p2];
832 p1++;
833 }
834 p2++;
835 }
836 cfg.host[p1] = '\0';
837 }
838
839 if (!cfg.remote_cmd_ptr && !*cfg.remote_cmd && !*cfg.ssh_nc_host)
840 flags |= FLAG_INTERACTIVE;
841
842 /*
843 * Select protocol. This is farmed out into a table in a
844 * separate file to enable an ssh-free variant.
845 */
846 back = backend_from_proto(cfg.protocol);
847 if (back == NULL) {
848 fprintf(stderr,
849 "Internal fault: Unsupported protocol found\n");
850 return 1;
851 }
852
853 /*
854 * Select port.
855 */
856 if (portnumber != -1)
857 cfg.port = portnumber;
858
859 /*
860 * Set up the pipe we'll use to tell us about SIGWINCH.
861 */
862 if (pipe(signalpipe) < 0) {
863 perror("pipe");
864 exit(1);
865 }
866 putty_signal(SIGWINCH, sigwinch);
867
868 sk_init();
869 uxsel_init();
870
871 /*
872 * Unix Plink doesn't provide any way to add forwardings after the
873 * connection is set up, so if there are none now, we can safely set
874 * the "simple" flag.
875 */
876 if (cfg.protocol == PROT_SSH && !cfg.x11_forward && !cfg.agentfwd &&
877 cfg.portfwd[0] == '\0' && cfg.portfwd[1] == '\0')
878 cfg.ssh_simple = TRUE;
879 /*
880 * Start up the connection.
881 */
882 logctx = log_init(NULL, &cfg);
883 console_provide_logctx(logctx);
884 {
885 const char *error;
886 char *realhost;
887 /* nodelay is only useful if stdin is a terminal device */
888 int nodelay = cfg.tcp_nodelay && isatty(0);
889
890 error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
891 &realhost, nodelay, cfg.tcp_keepalives);
892 if (error) {
893 fprintf(stderr, "Unable to open connection:\n%s\n", error);
894 return 1;
895 }
896 back->provide_logctx(backhandle, logctx);
897 ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL);
898 sfree(realhost);
899 }
900 connopen = 1;
901
902 /*
903 * Set up the initial console mode. We don't care if this call
904 * fails, because we know we aren't necessarily running in a
905 * console.
906 */
907 local_tty = (tcgetattr(STDIN_FILENO, &orig_termios) == 0);
908 atexit(cleanup_termios);
909 ldisc_update(NULL, 1, 1);
910 sending = FALSE;
911 now = GETTICKCOUNT();
912
913 while (1) {
914 fd_set rset, wset, xset;
915 int maxfd;
916 int rwx;
917 int ret;
918
919 FD_ZERO(&rset);
920 FD_ZERO(&wset);
921 FD_ZERO(&xset);
922 maxfd = 0;
923
924 FD_SET_MAX(signalpipe[0], maxfd, rset);
925
926 if (connopen && !sending &&
927 back->connected(backhandle) &&
928 back->sendok(backhandle) &&
929 back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
930 /* If we're OK to send, then try to read from stdin. */
931 FD_SET_MAX(STDIN_FILENO, maxfd, rset);
932 }
933
934 if (bufchain_size(&stdout_data) > 0) {
935 /* If we have data for stdout, try to write to stdout. */
936 FD_SET_MAX(STDOUT_FILENO, maxfd, wset);
937 }
938
939 if (bufchain_size(&stderr_data) > 0) {
940 /* If we have data for stderr, try to write to stderr. */
941 FD_SET_MAX(STDERR_FILENO, maxfd, wset);
942 }
943
944 /* Count the currently active fds. */
945 i = 0;
946 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
947 fd = next_fd(&fdstate, &rwx)) i++;
948
949 /* Expand the fdlist buffer if necessary. */
950 if (i > fdsize) {
951 fdsize = i + 16;
952 fdlist = sresize(fdlist, fdsize, int);
953 }
954
955 /*
956 * Add all currently open fds to the select sets, and store
957 * them in fdlist as well.
958 */
959 fdcount = 0;
960 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
961 fd = next_fd(&fdstate, &rwx)) {
962 fdlist[fdcount++] = fd;
963 if (rwx & 1)
964 FD_SET_MAX(fd, maxfd, rset);
965 if (rwx & 2)
966 FD_SET_MAX(fd, maxfd, wset);
967 if (rwx & 4)
968 FD_SET_MAX(fd, maxfd, xset);
969 }
970
971 do {
972 long next, ticks;
973 struct timeval tv, *ptv;
974
975 if (run_timers(now, &next)) {
976 ticks = next - GETTICKCOUNT();
977 if (ticks < 0) ticks = 0; /* just in case */
978 tv.tv_sec = ticks / 1000;
979 tv.tv_usec = ticks % 1000 * 1000;
980 ptv = &tv;
981 } else {
982 ptv = NULL;
983 }
984 ret = select(maxfd, &rset, &wset, &xset, ptv);
985 if (ret == 0)
986 now = next;
987 else {
988 long newnow = GETTICKCOUNT();
989 /*
990 * Check to see whether the system clock has
991 * changed massively during the select.
992 */
993 if (newnow - now < 0 || newnow - now > next - now) {
994 /*
995 * If so, look at the elapsed time in the
996 * select and use it to compute a new
997 * tickcount_offset.
998 */
999 long othernow = now + tv.tv_sec * 1000 + tv.tv_usec / 1000;
1000 /* So we'd like GETTICKCOUNT to have returned othernow,
1001 * but instead it return newnow. Hence ... */
1002 tickcount_offset += othernow - newnow;
1003 now = othernow;
1004 } else {
1005 now = newnow;
1006 }
1007 }
1008 } while (ret < 0 && errno == EINTR);
1009
1010 if (ret < 0) {
1011 perror("select");
1012 exit(1);
1013 }
1014
1015 for (i = 0; i < fdcount; i++) {
1016 fd = fdlist[i];
1017 /*
1018 * We must process exceptional notifications before
1019 * ordinary readability ones, or we may go straight
1020 * past the urgent marker.
1021 */
1022 if (FD_ISSET(fd, &xset))
1023 select_result(fd, 4);
1024 if (FD_ISSET(fd, &rset))
1025 select_result(fd, 1);
1026 if (FD_ISSET(fd, &wset))
1027 select_result(fd, 2);
1028 }
1029
1030 if (FD_ISSET(signalpipe[0], &rset)) {
1031 char c[1];
1032 struct winsize size;
1033 read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */
1034 if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
1035 back->size(backhandle, size.ws_col, size.ws_row);
1036 }
1037
1038 if (FD_ISSET(STDIN_FILENO, &rset)) {
1039 char buf[4096];
1040 int ret;
1041
1042 if (connopen && back->connected(backhandle)) {
1043 ret = read(STDIN_FILENO, buf, sizeof(buf));
1044 if (ret < 0) {
1045 perror("stdin: read");
1046 exit(1);
1047 } else if (ret == 0) {
1048 back->special(backhandle, TS_EOF);
1049 sending = FALSE; /* send nothing further after this */
1050 } else {
1051 if (local_tty)
1052 from_tty(buf, ret);
1053 else
1054 back->send(backhandle, buf, ret);
1055 }
1056 }
1057 }
1058
1059 if (FD_ISSET(STDOUT_FILENO, &wset)) {
1060 back->unthrottle(backhandle, try_output(FALSE));
1061 }
1062
1063 if (FD_ISSET(STDERR_FILENO, &wset)) {
1064 back->unthrottle(backhandle, try_output(TRUE));
1065 }
1066
1067 if ((!connopen || !back->connected(backhandle)) &&
1068 bufchain_size(&stdout_data) == 0 &&
1069 bufchain_size(&stderr_data) == 0)
1070 break; /* we closed the connection */
1071 }
1072 exitcode = back->exitcode(backhandle);
1073 if (exitcode < 0) {
1074 fprintf(stderr, "Remote process exit code unavailable\n");
1075 exitcode = 1; /* this is an error condition */
1076 }
1077 cleanup_exit(exitcode);
1078 return exitcode; /* shouldn't happen, but placates gcc */
1079 }
Local modifications for Simon Tatham's `PuTTY' SSH client and terminal emulator