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