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Add support for resetting the terminal modes on stderr to something sensible
[sgt/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 void 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;
393
394 if (bufchain_size(chain) == 0)
395 return;
396
397 bufchain_prefix(chain, &senddata, &sendlen);
398 ret = write(fd, senddata, sendlen);
399 if (ret > 0)
400 bufchain_consume(chain, ret);
401 else if (ret < 0) {
402 perror(is_stderr ? "stderr: write" : "stdout: write");
403 exit(1);
404 }
405 }
406
407 int from_backend(void *frontend_handle, int is_stderr,
408 const char *data, int len)
409 {
410 int osize, esize;
411
412 if (is_stderr) {
413 bufchain_add(&stderr_data, data, len);
414 try_output(TRUE);
415 } else {
416 bufchain_add(&stdout_data, data, len);
417 try_output(FALSE);
418 }
419
420 osize = bufchain_size(&stdout_data);
421 esize = bufchain_size(&stderr_data);
422
423 return osize + esize;
424 }
425
426 int from_backend_untrusted(void *frontend_handle, const char *data, int len)
427 {
428 /*
429 * No "untrusted" output should get here (the way the code is
430 * currently, it's all diverted by FLAG_STDERR).
431 */
432 assert(!"Unexpected call to from_backend_untrusted()");
433 return 0; /* not reached */
434 }
435
436 int get_userpass_input(prompts_t *p, unsigned char *in, int inlen)
437 {
438 int ret;
439 ret = cmdline_get_passwd_input(p, in, inlen);
440 if (ret == -1)
441 ret = console_get_userpass_input(p, in, inlen);
442 return ret;
443 }
444
445 /*
446 * Handle data from a local tty in PARMRK format.
447 */
448 static void from_tty(void *vbuf, unsigned len)
449 {
450 char *p, *q, *end, *buf = vbuf;
451 static enum {NORMAL, FF, FF00} state = NORMAL;
452
453 p = buf; end = buf + len;
454 while (p < end) {
455 switch (state) {
456 case NORMAL:
457 if (*p == '\xff') {
458 p++;
459 state = FF;
460 } else {
461 q = memchr(p, '\xff', end - p);
462 if (q == NULL) q = end;
463 back->send(backhandle, p, q - p);
464 p = q;
465 }
466 break;
467 case FF:
468 if (*p == '\xff') {
469 back->send(backhandle, p, 1);
470 p++;
471 state = NORMAL;
472 } else if (*p == '\0') {
473 p++;
474 state = FF00;
475 } else abort();
476 break;
477 case FF00:
478 if (*p == '\0') {
479 back->special(backhandle, TS_BRK);
480 } else {
481 /*
482 * Pretend that PARMRK wasn't set. This involves
483 * faking what INPCK and IGNPAR would have done if
484 * we hadn't overridden them. Unfortunately, we
485 * can't do this entirely correctly because INPCK
486 * distinguishes between framing and parity
487 * errors, but PARMRK format represents both in
488 * the same way. We assume that parity errors are
489 * more common than framing errors, and hence
490 * treat all input errors as being subject to
491 * INPCK.
492 */
493 if (orig_termios.c_iflag & INPCK) {
494 /* If IGNPAR is set, we throw away the character. */
495 if (!(orig_termios.c_iflag & IGNPAR)) {
496 /* PE/FE get passed on as NUL. */
497 *p = 0;
498 back->send(backhandle, p, 1);
499 }
500 } else {
501 /* INPCK not set. Assume we got a parity error. */
502 back->send(backhandle, p, 1);
503 }
504 }
505 p++;
506 state = NORMAL;
507 }
508 }
509 }
510
511 int signalpipe[2];
512
513 void sigwinch(int signum)
514 {
515 write(signalpipe[1], "x", 1);
516 }
517
518 /*
519 * In Plink our selects are synchronous, so these functions are
520 * empty stubs.
521 */
522 int uxsel_input_add(int fd, int rwx) { return 0; }
523 void uxsel_input_remove(int id) { }
524
525 /*
526 * Short description of parameters.
527 */
528 static void usage(void)
529 {
530 printf("PuTTY Link: command-line connection utility\n");
531 printf("%s\n", ver);
532 printf("Usage: plink [options] [user@]host [command]\n");
533 printf(" (\"host\" can also be a PuTTY saved session name)\n");
534 printf("Options:\n");
535 printf(" -V print version information and exit\n");
536 printf(" -pgpfp print PGP key fingerprints and exit\n");
537 printf(" -v show verbose messages\n");
538 printf(" -load sessname Load settings from saved session\n");
539 printf(" -ssh -telnet -rlogin -raw\n");
540 printf(" force use of a particular protocol\n");
541 printf(" -P port connect to specified port\n");
542 printf(" -l user connect with specified username\n");
543 printf(" -batch disable all interactive prompts\n");
544 printf("The following options only apply to SSH connections:\n");
545 printf(" -pw passw login with specified password\n");
546 printf(" -D [listen-IP:]listen-port\n");
547 printf(" Dynamic SOCKS-based port forwarding\n");
548 printf(" -L [listen-IP:]listen-port:host:port\n");
549 printf(" Forward local port to remote address\n");
550 printf(" -R [listen-IP:]listen-port:host:port\n");
551 printf(" Forward remote port to local address\n");
552 printf(" -X -x enable / disable X11 forwarding\n");
553 printf(" -A -a enable / disable agent forwarding\n");
554 printf(" -t -T enable / disable pty allocation\n");
555 printf(" -1 -2 force use of particular protocol version\n");
556 printf(" -4 -6 force use of IPv4 or IPv6\n");
557 printf(" -C enable compression\n");
558 printf(" -i key private key file for authentication\n");
559 printf(" -noagent disable use of Pageant\n");
560 printf(" -agent enable use of Pageant\n");
561 printf(" -m file read remote command(s) from file\n");
562 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
563 printf(" -N don't start a shell/command (SSH-2 only)\n");
564 printf(" -nc host:port\n");
565 printf(" open tunnel in place of session (SSH-2 only)\n");
566 exit(1);
567 }
568
569 static void version(void)
570 {
571 printf("plink: %s\n", ver);
572 exit(1);
573 }
574
575 int main(int argc, char **argv)
576 {
577 int sending;
578 int portnumber = -1;
579 int *fdlist;
580 int fd;
581 int i, fdcount, fdsize, fdstate;
582 int connopen;
583 int exitcode;
584 int errors;
585 int use_subsystem = 0;
586 void *ldisc;
587 long now;
588
589 fdlist = NULL;
590 fdcount = fdsize = 0;
591 /*
592 * Initialise port and protocol to sensible defaults. (These
593 * will be overridden by more or less anything.)
594 */
595 default_protocol = PROT_SSH;
596 default_port = 22;
597
598 flags = FLAG_STDERR | FLAG_STDERR_TTY;
599
600 stderr_tty_init();
601 /*
602 * Process the command line.
603 */
604 do_defaults(NULL, &cfg);
605 loaded_session = FALSE;
606 default_protocol = cfg.protocol;
607 default_port = cfg.port;
608 errors = 0;
609 {
610 /*
611 * Override the default protocol if PLINK_PROTOCOL is set.
612 */
613 char *p = getenv("PLINK_PROTOCOL");
614 if (p) {
615 const Backend *b = backend_from_name(p);
616 if (b) {
617 default_protocol = cfg.protocol = b->protocol;
618 default_port = cfg.port = b->default_port;
619 }
620 }
621 }
622 while (--argc) {
623 char *p = *++argv;
624 if (*p == '-') {
625 int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
626 1, &cfg);
627 if (ret == -2) {
628 fprintf(stderr,
629 "plink: option \"%s\" requires an argument\n", p);
630 errors = 1;
631 } else if (ret == 2) {
632 --argc, ++argv;
633 } else if (ret == 1) {
634 continue;
635 } else if (!strcmp(p, "-batch")) {
636 console_batch_mode = 1;
637 } else if (!strcmp(p, "-s")) {
638 /* Save status to write to cfg later. */
639 use_subsystem = 1;
640 } else if (!strcmp(p, "-V")) {
641 version();
642 } else if (!strcmp(p, "-pgpfp")) {
643 pgp_fingerprints();
644 exit(1);
645 } else if (!strcmp(p, "-o")) {
646 if (argc <= 1) {
647 fprintf(stderr,
648 "plink: option \"-o\" requires an argument\n");
649 errors = 1;
650 } else {
651 --argc;
652 provide_xrm_string(*++argv);
653 }
654 } else {
655 fprintf(stderr, "plink: unknown option \"%s\"\n", p);
656 errors = 1;
657 }
658 } else if (*p) {
659 if (!cfg_launchable(&cfg)) {
660 char *q = p;
661
662 /*
663 * If the hostname starts with "telnet:", set the
664 * protocol to Telnet and process the string as a
665 * Telnet URL.
666 */
667 if (!strncmp(q, "telnet:", 7)) {
668 char c;
669
670 q += 7;
671 if (q[0] == '/' && q[1] == '/')
672 q += 2;
673 cfg.protocol = PROT_TELNET;
674 p = q;
675 while (*p && *p != ':' && *p != '/')
676 p++;
677 c = *p;
678 if (*p)
679 *p++ = '\0';
680 if (c == ':')
681 cfg.port = atoi(p);
682 else
683 cfg.port = -1;
684 strncpy(cfg.host, q, sizeof(cfg.host) - 1);
685 cfg.host[sizeof(cfg.host) - 1] = '\0';
686 } else {
687 char *r, *user, *host;
688 /*
689 * Before we process the [user@]host string, we
690 * first check for the presence of a protocol
691 * prefix (a protocol name followed by ",").
692 */
693 r = strchr(p, ',');
694 if (r) {
695 const Backend *b;
696 *r = '\0';
697 b = backend_from_name(p);
698 if (b) {
699 default_protocol = cfg.protocol = b->protocol;
700 portnumber = b->default_port;
701 }
702 p = r + 1;
703 }
704
705 /*
706 * A nonzero length string followed by an @ is treated
707 * as a username. (We discount an _initial_ @.) The
708 * rest of the string (or the whole string if no @)
709 * is treated as a session name and/or hostname.
710 */
711 r = strrchr(p, '@');
712 if (r == p)
713 p++, r = NULL; /* discount initial @ */
714 if (r) {
715 *r++ = '\0';
716 user = p, host = r;
717 } else {
718 user = NULL, host = p;
719 }
720
721 /*
722 * Now attempt to load a saved session with the
723 * same name as the hostname.
724 */
725 {
726 Config cfg2;
727 do_defaults(host, &cfg2);
728 if (loaded_session || !cfg_launchable(&cfg2)) {
729 /* No settings for this host; use defaults */
730 /* (or session was already loaded with -load) */
731 strncpy(cfg.host, host, sizeof(cfg.host) - 1);
732 cfg.host[sizeof(cfg.host) - 1] = '\0';
733 cfg.port = default_port;
734 } else {
735 cfg = cfg2;
736 }
737 }
738
739 if (user) {
740 /* Patch in specified username. */
741 strncpy(cfg.username, user,
742 sizeof(cfg.username) - 1);
743 cfg.username[sizeof(cfg.username) - 1] = '\0';
744 }
745
746 }
747 } else {
748 char *command;
749 int cmdlen, cmdsize;
750 cmdlen = cmdsize = 0;
751 command = NULL;
752
753 while (argc) {
754 while (*p) {
755 if (cmdlen >= cmdsize) {
756 cmdsize = cmdlen + 512;
757 command = sresize(command, cmdsize, char);
758 }
759 command[cmdlen++]=*p++;
760 }
761 if (cmdlen >= cmdsize) {
762 cmdsize = cmdlen + 512;
763 command = sresize(command, cmdsize, char);
764 }
765 command[cmdlen++]=' '; /* always add trailing space */
766 if (--argc) p = *++argv;
767 }
768 if (cmdlen) command[--cmdlen]='\0';
769 /* change trailing blank to NUL */
770 cfg.remote_cmd_ptr = command;
771 cfg.remote_cmd_ptr2 = NULL;
772 cfg.nopty = TRUE; /* command => no terminal */
773
774 break; /* done with cmdline */
775 }
776 }
777 }
778
779 if (errors)
780 return 1;
781
782 if (!cfg_launchable(&cfg)) {
783 usage();
784 }
785
786 /*
787 * Trim leading whitespace off the hostname if it's there.
788 */
789 {
790 int space = strspn(cfg.host, " \t");
791 memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
792 }
793
794 /* See if host is of the form user@host */
795 if (cfg.host[0] != '\0') {
796 char *atsign = strrchr(cfg.host, '@');
797 /* Make sure we're not overflowing the user field */
798 if (atsign) {
799 if (atsign - cfg.host < sizeof cfg.username) {
800 strncpy(cfg.username, cfg.host, atsign - cfg.host);
801 cfg.username[atsign - cfg.host] = '\0';
802 }
803 memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
804 }
805 }
806
807 /*
808 * Perform command-line overrides on session configuration.
809 */
810 cmdline_run_saved(&cfg);
811
812 /*
813 * Apply subsystem status.
814 */
815 if (use_subsystem)
816 cfg.ssh_subsys = TRUE;
817
818 /*
819 * Trim a colon suffix off the hostname if it's there.
820 */
821 cfg.host[strcspn(cfg.host, ":")] = '\0';
822
823 /*
824 * Remove any remaining whitespace from the hostname.
825 */
826 {
827 int p1 = 0, p2 = 0;
828 while (cfg.host[p2] != '\0') {
829 if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
830 cfg.host[p1] = cfg.host[p2];
831 p1++;
832 }
833 p2++;
834 }
835 cfg.host[p1] = '\0';
836 }
837
838 if (!cfg.remote_cmd_ptr && !*cfg.remote_cmd && !*cfg.ssh_nc_host)
839 flags |= FLAG_INTERACTIVE;
840
841 /*
842 * Select protocol. This is farmed out into a table in a
843 * separate file to enable an ssh-free variant.
844 */
845 back = backend_from_proto(cfg.protocol);
846 if (back == NULL) {
847 fprintf(stderr,
848 "Internal fault: Unsupported protocol found\n");
849 return 1;
850 }
851
852 /*
853 * Select port.
854 */
855 if (portnumber != -1)
856 cfg.port = portnumber;
857
858 /*
859 * Set up the pipe we'll use to tell us about SIGWINCH.
860 */
861 if (pipe(signalpipe) < 0) {
862 perror("pipe");
863 exit(1);
864 }
865 putty_signal(SIGWINCH, sigwinch);
866
867 sk_init();
868 uxsel_init();
869
870 /*
871 * Start up the connection.
872 */
873 logctx = log_init(NULL, &cfg);
874 console_provide_logctx(logctx);
875 {
876 const char *error;
877 char *realhost;
878 /* nodelay is only useful if stdin is a terminal device */
879 int nodelay = cfg.tcp_nodelay && isatty(0);
880
881 error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
882 &realhost, nodelay, cfg.tcp_keepalives);
883 if (error) {
884 fprintf(stderr, "Unable to open connection:\n%s\n", error);
885 return 1;
886 }
887 back->provide_logctx(backhandle, logctx);
888 ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL);
889 sfree(realhost);
890 }
891 connopen = 1;
892
893 /*
894 * Set up the initial console mode. We don't care if this call
895 * fails, because we know we aren't necessarily running in a
896 * console.
897 */
898 local_tty = (tcgetattr(STDIN_FILENO, &orig_termios) == 0);
899 atexit(cleanup_termios);
900 ldisc_update(NULL, 1, 1);
901 sending = FALSE;
902 now = GETTICKCOUNT();
903
904 while (1) {
905 fd_set rset, wset, xset;
906 int maxfd;
907 int rwx;
908 int ret;
909
910 FD_ZERO(&rset);
911 FD_ZERO(&wset);
912 FD_ZERO(&xset);
913 maxfd = 0;
914
915 FD_SET_MAX(signalpipe[0], maxfd, rset);
916
917 if (connopen && !sending &&
918 back->connected(backhandle) &&
919 back->sendok(backhandle) &&
920 back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
921 /* If we're OK to send, then try to read from stdin. */
922 FD_SET_MAX(STDIN_FILENO, maxfd, rset);
923 }
924
925 if (bufchain_size(&stdout_data) > 0) {
926 /* If we have data for stdout, try to write to stdout. */
927 FD_SET_MAX(STDOUT_FILENO, maxfd, wset);
928 }
929
930 if (bufchain_size(&stderr_data) > 0) {
931 /* If we have data for stderr, try to write to stderr. */
932 FD_SET_MAX(STDERR_FILENO, maxfd, wset);
933 }
934
935 /* Count the currently active fds. */
936 i = 0;
937 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
938 fd = next_fd(&fdstate, &rwx)) i++;
939
940 /* Expand the fdlist buffer if necessary. */
941 if (i > fdsize) {
942 fdsize = i + 16;
943 fdlist = sresize(fdlist, fdsize, int);
944 }
945
946 /*
947 * Add all currently open fds to the select sets, and store
948 * them in fdlist as well.
949 */
950 fdcount = 0;
951 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
952 fd = next_fd(&fdstate, &rwx)) {
953 fdlist[fdcount++] = fd;
954 if (rwx & 1)
955 FD_SET_MAX(fd, maxfd, rset);
956 if (rwx & 2)
957 FD_SET_MAX(fd, maxfd, wset);
958 if (rwx & 4)
959 FD_SET_MAX(fd, maxfd, xset);
960 }
961
962 do {
963 long next, ticks;
964 struct timeval tv, *ptv;
965
966 if (run_timers(now, &next)) {
967 ticks = next - GETTICKCOUNT();
968 if (ticks < 0) ticks = 0; /* just in case */
969 tv.tv_sec = ticks / 1000;
970 tv.tv_usec = ticks % 1000 * 1000;
971 ptv = &tv;
972 } else {
973 ptv = NULL;
974 }
975 ret = select(maxfd, &rset, &wset, &xset, ptv);
976 if (ret == 0)
977 now = next;
978 else {
979 long newnow = GETTICKCOUNT();
980 /*
981 * Check to see whether the system clock has
982 * changed massively during the select.
983 */
984 if (newnow - now < 0 || newnow - now > next - now) {
985 /*
986 * If so, look at the elapsed time in the
987 * select and use it to compute a new
988 * tickcount_offset.
989 */
990 long othernow = now + tv.tv_sec * 1000 + tv.tv_usec / 1000;
991 /* So we'd like GETTICKCOUNT to have returned othernow,
992 * but instead it return newnow. Hence ... */
993 tickcount_offset += othernow - newnow;
994 now = othernow;
995 } else {
996 now = newnow;
997 }
998 }
999 } while (ret < 0 && errno == EINTR);
1000
1001 if (ret < 0) {
1002 perror("select");
1003 exit(1);
1004 }
1005
1006 for (i = 0; i < fdcount; i++) {
1007 fd = fdlist[i];
1008 /*
1009 * We must process exceptional notifications before
1010 * ordinary readability ones, or we may go straight
1011 * past the urgent marker.
1012 */
1013 if (FD_ISSET(fd, &xset))
1014 select_result(fd, 4);
1015 if (FD_ISSET(fd, &rset))
1016 select_result(fd, 1);
1017 if (FD_ISSET(fd, &wset))
1018 select_result(fd, 2);
1019 }
1020
1021 if (FD_ISSET(signalpipe[0], &rset)) {
1022 char c[1];
1023 struct winsize size;
1024 read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */
1025 if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
1026 back->size(backhandle, size.ws_col, size.ws_row);
1027 }
1028
1029 if (FD_ISSET(STDIN_FILENO, &rset)) {
1030 char buf[4096];
1031 int ret;
1032
1033 if (connopen && back->connected(backhandle)) {
1034 ret = read(STDIN_FILENO, buf, sizeof(buf));
1035 if (ret < 0) {
1036 perror("stdin: read");
1037 exit(1);
1038 } else if (ret == 0) {
1039 back->special(backhandle, TS_EOF);
1040 sending = FALSE; /* send nothing further after this */
1041 } else {
1042 if (local_tty)
1043 from_tty(buf, ret);
1044 else
1045 back->send(backhandle, buf, ret);
1046 }
1047 }
1048 }
1049
1050 if (FD_ISSET(STDOUT_FILENO, &wset)) {
1051 try_output(FALSE);
1052 }
1053
1054 if (FD_ISSET(STDERR_FILENO, &wset)) {
1055 try_output(TRUE);
1056 }
1057
1058 if ((!connopen || !back->connected(backhandle)) &&
1059 bufchain_size(&stdout_data) == 0 &&
1060 bufchain_size(&stderr_data) == 0)
1061 break; /* we closed the connection */
1062 }
1063 exitcode = back->exitcode(backhandle);
1064 if (exitcode < 0) {
1065 fprintf(stderr, "Remote process exit code unavailable\n");
1066 exitcode = 1; /* this is an error condition */
1067 }
1068 cleanup_exit(exitcode);
1069 return exitcode; /* shouldn't happen, but placates gcc */
1070 }
Simon Tatham's PuTTY GUI SSH client; import of svn://svn.tartarus.org/sgt/putty