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