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4d36e50abb60c6d14cd6c3e674a5274a2eafddde
[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 Conf *conf;
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 if (write(signalpipe[1], "x", 1) <= 0)
517 /* not much we can do about it */;
518 }
519
520 /*
521 * In Plink our selects are synchronous, so these functions are
522 * empty stubs.
523 */
524 int uxsel_input_add(int fd, int rwx) { return 0; }
525 void uxsel_input_remove(int id) { }
526
527 /*
528 * Short description of parameters.
529 */
530 static void usage(void)
531 {
532 printf("PuTTY Link: command-line connection utility\n");
533 printf("%s\n", ver);
534 printf("Usage: plink [options] [user@]host [command]\n");
535 printf(" (\"host\" can also be a PuTTY saved session name)\n");
536 printf("Options:\n");
537 printf(" -V print version information and exit\n");
538 printf(" -pgpfp print PGP key fingerprints and exit\n");
539 printf(" -v show verbose messages\n");
540 printf(" -load sessname Load settings from saved session\n");
541 printf(" -ssh -telnet -rlogin -raw -serial\n");
542 printf(" force use of a particular protocol\n");
543 printf(" -P port connect to specified port\n");
544 printf(" -l user connect with specified username\n");
545 printf(" -batch disable all interactive prompts\n");
546 printf("The following options only apply to SSH connections:\n");
547 printf(" -pw passw login with specified password\n");
548 printf(" -D [listen-IP:]listen-port\n");
549 printf(" Dynamic SOCKS-based port forwarding\n");
550 printf(" -L [listen-IP:]listen-port:host:port\n");
551 printf(" Forward local port to remote address\n");
552 printf(" -R [listen-IP:]listen-port:host:port\n");
553 printf(" Forward remote port to local address\n");
554 printf(" -X -x enable / disable X11 forwarding\n");
555 printf(" -A -a enable / disable agent forwarding\n");
556 printf(" -t -T enable / disable pty allocation\n");
557 printf(" -1 -2 force use of particular protocol version\n");
558 printf(" -4 -6 force use of IPv4 or IPv6\n");
559 printf(" -C enable compression\n");
560 printf(" -i key private key file for authentication\n");
561 printf(" -noagent disable use of Pageant\n");
562 printf(" -agent enable use of Pageant\n");
563 printf(" -m file read remote command(s) from file\n");
564 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
565 printf(" -N don't start a shell/command (SSH-2 only)\n");
566 printf(" -nc host:port\n");
567 printf(" open tunnel in place of session (SSH-2 only)\n");
568 printf(" -sercfg configuration-string (e.g. 19200,8,n,1,X)\n");
569 printf(" Specify the serial configuration (serial only)\n");
570 exit(1);
571 }
572
573 static void version(void)
574 {
575 printf("plink: %s\n", ver);
576 exit(1);
577 }
578
579 int main(int argc, char **argv)
580 {
581 int sending;
582 int portnumber = -1;
583 int *fdlist;
584 int fd;
585 int i, fdcount, fdsize, fdstate;
586 int connopen;
587 int exitcode;
588 int errors;
589 int use_subsystem = 0;
590 int got_host = FALSE;
591 long now;
592
593 fdlist = NULL;
594 fdcount = fdsize = 0;
595 /*
596 * Initialise port and protocol to sensible defaults. (These
597 * will be overridden by more or less anything.)
598 */
599 default_protocol = PROT_SSH;
600 default_port = 22;
601
602 flags = FLAG_STDERR | FLAG_STDERR_TTY;
603
604 stderr_tty_init();
605 /*
606 * Process the command line.
607 */
608 conf = conf_new();
609 do_defaults(NULL, conf);
610 loaded_session = FALSE;
611 default_protocol = conf_get_int(conf, CONF_protocol);
612 default_port = conf_get_int(conf, CONF_port);
613 errors = 0;
614 {
615 /*
616 * Override the default protocol if PLINK_PROTOCOL is set.
617 */
618 char *p = getenv("PLINK_PROTOCOL");
619 if (p) {
620 const Backend *b = backend_from_name(p);
621 if (b) {
622 default_protocol = b->protocol;
623 default_port = b->default_port;
624 conf_set_int(conf, CONF_protocol, default_protocol);
625 conf_set_int(conf, CONF_port, default_port);
626 }
627 }
628 }
629 while (--argc) {
630 char *p = *++argv;
631 if (*p == '-') {
632 int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
633 1, conf);
634 if (ret == -2) {
635 fprintf(stderr,
636 "plink: option \"%s\" requires an argument\n", p);
637 errors = 1;
638 } else if (ret == 2) {
639 --argc, ++argv;
640 } else if (ret == 1) {
641 continue;
642 } else if (!strcmp(p, "-batch")) {
643 console_batch_mode = 1;
644 } else if (!strcmp(p, "-s")) {
645 /* Save status to write to conf later. */
646 use_subsystem = 1;
647 } else if (!strcmp(p, "-V")) {
648 version();
649 } else if (!strcmp(p, "-pgpfp")) {
650 pgp_fingerprints();
651 exit(1);
652 } else if (!strcmp(p, "-o")) {
653 if (argc <= 1) {
654 fprintf(stderr,
655 "plink: option \"-o\" requires an argument\n");
656 errors = 1;
657 } else {
658 --argc;
659 provide_xrm_string(*++argv);
660 }
661 } else {
662 fprintf(stderr, "plink: unknown option \"%s\"\n", p);
663 errors = 1;
664 }
665 } else if (*p) {
666 if (!conf_launchable(conf) || !(got_host || loaded_session)) {
667 char *q = p;
668
669 /*
670 * If the hostname starts with "telnet:", set the
671 * protocol to Telnet and process the string as a
672 * Telnet URL.
673 */
674 if (!strncmp(q, "telnet:", 7)) {
675 char c;
676
677 q += 7;
678 if (q[0] == '/' && q[1] == '/')
679 q += 2;
680 conf_set_int(conf, CONF_protocol, PROT_TELNET);
681 p = q;
682 while (*p && *p != ':' && *p != '/')
683 p++;
684 c = *p;
685 if (*p)
686 *p++ = '\0';
687 if (c == ':')
688 conf_set_int(conf, CONF_port, atoi(p));
689 else
690 conf_set_int(conf, CONF_port, -1);
691 conf_set_str(conf, CONF_host, q);
692 got_host = TRUE;
693 } else {
694 char *r, *user, *host;
695 /*
696 * Before we process the [user@]host string, we
697 * first check for the presence of a protocol
698 * prefix (a protocol name followed by ",").
699 */
700 r = strchr(p, ',');
701 if (r) {
702 const Backend *b;
703 *r = '\0';
704 b = backend_from_name(p);
705 if (b) {
706 default_protocol = b->protocol;
707 conf_set_int(conf, CONF_protocol,
708 default_protocol);
709 portnumber = b->default_port;
710 }
711 p = r + 1;
712 }
713
714 /*
715 * A nonzero length string followed by an @ is treated
716 * as a username. (We discount an _initial_ @.) The
717 * rest of the string (or the whole string if no @)
718 * is treated as a session name and/or hostname.
719 */
720 r = strrchr(p, '@');
721 if (r == p)
722 p++, r = NULL; /* discount initial @ */
723 if (r) {
724 *r++ = '\0';
725 user = p, host = r;
726 } else {
727 user = NULL, host = p;
728 }
729
730 /*
731 * Now attempt to load a saved session with the
732 * same name as the hostname.
733 */
734 {
735 Conf *conf2 = conf_new();
736 do_defaults(host, conf2);
737 if (loaded_session || !conf_launchable(conf2)) {
738 /* No settings for this host; use defaults */
739 /* (or session was already loaded with -load) */
740 conf_set_str(conf, CONF_host, host);
741 conf_set_int(conf, CONF_port, default_port);
742 got_host = TRUE;
743 } else {
744 conf_copy_into(conf, conf2);
745 loaded_session = TRUE;
746 }
747 conf_free(conf2);
748 }
749
750 if (user) {
751 /* Patch in specified username. */
752 conf_set_str(conf, CONF_username, user);
753 }
754
755 }
756 } else {
757 char *command;
758 int cmdlen, cmdsize;
759 cmdlen = cmdsize = 0;
760 command = NULL;
761
762 while (argc) {
763 while (*p) {
764 if (cmdlen >= cmdsize) {
765 cmdsize = cmdlen + 512;
766 command = sresize(command, cmdsize, char);
767 }
768 command[cmdlen++]=*p++;
769 }
770 if (cmdlen >= cmdsize) {
771 cmdsize = cmdlen + 512;
772 command = sresize(command, cmdsize, char);
773 }
774 command[cmdlen++]=' '; /* always add trailing space */
775 if (--argc) p = *++argv;
776 }
777 if (cmdlen) command[--cmdlen]='\0';
778 /* change trailing blank to NUL */
779 conf_set_str(conf, CONF_remote_cmd, command);
780 conf_set_str(conf, CONF_remote_cmd2, "");
781 conf_set_int(conf, CONF_nopty, TRUE); /* command => no tty */
782
783 break; /* done with cmdline */
784 }
785 }
786 }
787
788 if (errors)
789 return 1;
790
791 if (!conf_launchable(conf) || !(got_host || loaded_session)) {
792 usage();
793 }
794
795 /*
796 * Muck about with the hostname in various ways.
797 */
798 {
799 char *hostbuf = dupstr(conf_get_str(conf, CONF_host));
800 char *host = hostbuf;
801 char *p, *q;
802
803 /*
804 * Trim leading whitespace.
805 */
806 host += strspn(host, " \t");
807
808 /*
809 * See if host is of the form user@host, and separate out
810 * the username if so.
811 */
812 if (host[0] != '\0') {
813 char *atsign = strrchr(host, '@');
814 if (atsign) {
815 *atsign = '\0';
816 conf_set_str(conf, CONF_username, host);
817 host = atsign + 1;
818 }
819 }
820
821 /*
822 * Trim off a colon suffix if it's there.
823 */
824 host[strcspn(host, ":")] = '\0';
825
826 /*
827 * Remove any remaining whitespace.
828 */
829 p = hostbuf;
830 q = host;
831 while (*q) {
832 if (*q != ' ' && *q != '\t')
833 *p++ = *q;
834 q++;
835 }
836 *p = '\0';
837
838 conf_set_str(conf, CONF_host, hostbuf);
839 sfree(hostbuf);
840 }
841
842 /*
843 * Perform command-line overrides on session configuration.
844 */
845 cmdline_run_saved(conf);
846
847 /*
848 * Apply subsystem status.
849 */
850 if (use_subsystem)
851 conf_set_int(conf, CONF_ssh_subsys, TRUE);
852
853 if (!*conf_get_str(conf, CONF_remote_cmd) &&
854 !*conf_get_str(conf, CONF_remote_cmd2) &&
855 !*conf_get_str(conf, CONF_ssh_nc_host))
856 flags |= FLAG_INTERACTIVE;
857
858 /*
859 * Select protocol. This is farmed out into a table in a
860 * separate file to enable an ssh-free variant.
861 */
862 back = backend_from_proto(conf_get_int(conf, CONF_protocol));
863 if (back == NULL) {
864 fprintf(stderr,
865 "Internal fault: Unsupported protocol found\n");
866 return 1;
867 }
868
869 /*
870 * Select port.
871 */
872 if (portnumber != -1)
873 conf_set_int(conf, CONF_port, portnumber);
874
875 /*
876 * Set up the pipe we'll use to tell us about SIGWINCH.
877 */
878 if (pipe(signalpipe) < 0) {
879 perror("pipe");
880 exit(1);
881 }
882 putty_signal(SIGWINCH, sigwinch);
883
884 sk_init();
885 uxsel_init();
886
887 /*
888 * Unix Plink doesn't provide any way to add forwardings after the
889 * connection is set up, so if there are none now, we can safely set
890 * the "simple" flag.
891 */
892 if (conf_get_int(conf, CONF_protocol) == PROT_SSH &&
893 !conf_get_int(conf, CONF_x11_forward) &&
894 !conf_get_int(conf, CONF_agentfwd) &&
895 !conf_get_str_nthstrkey(conf, CONF_portfwd, 0))
896 conf_set_int(conf, CONF_ssh_simple, TRUE);
897
898 /*
899 * Start up the connection.
900 */
901 logctx = log_init(NULL, conf);
902 console_provide_logctx(logctx);
903 {
904 const char *error;
905 char *realhost;
906 /* nodelay is only useful if stdin is a terminal device */
907 int nodelay = conf_get_int(conf, CONF_tcp_nodelay) && isatty(0);
908
909 error = back->init(NULL, &backhandle, conf,
910 conf_get_str(conf, CONF_host),
911 conf_get_int(conf, CONF_port),
912 &realhost, nodelay,
913 conf_get_int(conf, CONF_tcp_keepalives));
914 if (error) {
915 fprintf(stderr, "Unable to open connection:\n%s\n", error);
916 return 1;
917 }
918 back->provide_logctx(backhandle, logctx);
919 ldisc_create(conf, NULL, back, backhandle, NULL);
920 sfree(realhost);
921 }
922 connopen = 1;
923
924 /*
925 * Set up the initial console mode. We don't care if this call
926 * fails, because we know we aren't necessarily running in a
927 * console.
928 */
929 local_tty = (tcgetattr(STDIN_FILENO, &orig_termios) == 0);
930 atexit(cleanup_termios);
931 ldisc_update(NULL, 1, 1);
932 sending = FALSE;
933 now = GETTICKCOUNT();
934
935 while (1) {
936 fd_set rset, wset, xset;
937 int maxfd;
938 int rwx;
939 int ret;
940
941 FD_ZERO(&rset);
942 FD_ZERO(&wset);
943 FD_ZERO(&xset);
944 maxfd = 0;
945
946 FD_SET_MAX(signalpipe[0], maxfd, rset);
947
948 if (connopen && !sending &&
949 back->connected(backhandle) &&
950 back->sendok(backhandle) &&
951 back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
952 /* If we're OK to send, then try to read from stdin. */
953 FD_SET_MAX(STDIN_FILENO, maxfd, rset);
954 }
955
956 if (bufchain_size(&stdout_data) > 0) {
957 /* If we have data for stdout, try to write to stdout. */
958 FD_SET_MAX(STDOUT_FILENO, maxfd, wset);
959 }
960
961 if (bufchain_size(&stderr_data) > 0) {
962 /* If we have data for stderr, try to write to stderr. */
963 FD_SET_MAX(STDERR_FILENO, maxfd, wset);
964 }
965
966 /* Count the currently active fds. */
967 i = 0;
968 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
969 fd = next_fd(&fdstate, &rwx)) i++;
970
971 /* Expand the fdlist buffer if necessary. */
972 if (i > fdsize) {
973 fdsize = i + 16;
974 fdlist = sresize(fdlist, fdsize, int);
975 }
976
977 /*
978 * Add all currently open fds to the select sets, and store
979 * them in fdlist as well.
980 */
981 fdcount = 0;
982 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
983 fd = next_fd(&fdstate, &rwx)) {
984 fdlist[fdcount++] = fd;
985 if (rwx & 1)
986 FD_SET_MAX(fd, maxfd, rset);
987 if (rwx & 2)
988 FD_SET_MAX(fd, maxfd, wset);
989 if (rwx & 4)
990 FD_SET_MAX(fd, maxfd, xset);
991 }
992
993 do {
994 long next, ticks;
995 struct timeval tv, *ptv;
996
997 if (run_timers(now, &next)) {
998 ticks = next - GETTICKCOUNT();
999 if (ticks < 0) ticks = 0; /* just in case */
1000 tv.tv_sec = ticks / 1000;
1001 tv.tv_usec = ticks % 1000 * 1000;
1002 ptv = &tv;
1003 } else {
1004 ptv = NULL;
1005 }
1006 ret = select(maxfd, &rset, &wset, &xset, ptv);
1007 if (ret == 0)
1008 now = next;
1009 else {
1010 long newnow = GETTICKCOUNT();
1011 /*
1012 * Check to see whether the system clock has
1013 * changed massively during the select.
1014 */
1015 if (newnow - now < 0 || newnow - now > next - now) {
1016 /*
1017 * If so, look at the elapsed time in the
1018 * select and use it to compute a new
1019 * tickcount_offset.
1020 */
1021 long othernow = now + tv.tv_sec * 1000 + tv.tv_usec / 1000;
1022 /* So we'd like GETTICKCOUNT to have returned othernow,
1023 * but instead it return newnow. Hence ... */
1024 tickcount_offset += othernow - newnow;
1025 now = othernow;
1026 } else {
1027 now = newnow;
1028 }
1029 }
1030 } while (ret < 0 && errno == EINTR);
1031
1032 if (ret < 0) {
1033 perror("select");
1034 exit(1);
1035 }
1036
1037 for (i = 0; i < fdcount; i++) {
1038 fd = fdlist[i];
1039 /*
1040 * We must process exceptional notifications before
1041 * ordinary readability ones, or we may go straight
1042 * past the urgent marker.
1043 */
1044 if (FD_ISSET(fd, &xset))
1045 select_result(fd, 4);
1046 if (FD_ISSET(fd, &rset))
1047 select_result(fd, 1);
1048 if (FD_ISSET(fd, &wset))
1049 select_result(fd, 2);
1050 }
1051
1052 if (FD_ISSET(signalpipe[0], &rset)) {
1053 char c[1];
1054 struct winsize size;
1055 if (read(signalpipe[0], c, 1) <= 0)
1056 /* ignore error */;
1057 /* ignore its value; it'll be `x' */
1058 if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
1059 back->size(backhandle, size.ws_col, size.ws_row);
1060 }
1061
1062 if (FD_ISSET(STDIN_FILENO, &rset)) {
1063 char buf[4096];
1064 int ret;
1065
1066 if (connopen && back->connected(backhandle)) {
1067 ret = read(STDIN_FILENO, buf, sizeof(buf));
1068 if (ret < 0) {
1069 perror("stdin: read");
1070 exit(1);
1071 } else if (ret == 0) {
1072 back->special(backhandle, TS_EOF);
1073 sending = FALSE; /* send nothing further after this */
1074 } else {
1075 if (local_tty)
1076 from_tty(buf, ret);
1077 else
1078 back->send(backhandle, buf, ret);
1079 }
1080 }
1081 }
1082
1083 if (FD_ISSET(STDOUT_FILENO, &wset)) {
1084 back->unthrottle(backhandle, try_output(FALSE));
1085 }
1086
1087 if (FD_ISSET(STDERR_FILENO, &wset)) {
1088 back->unthrottle(backhandle, try_output(TRUE));
1089 }
1090
1091 if ((!connopen || !back->connected(backhandle)) &&
1092 bufchain_size(&stdout_data) == 0 &&
1093 bufchain_size(&stderr_data) == 0)
1094 break; /* we closed the connection */
1095 }
1096 exitcode = back->exitcode(backhandle);
1097 if (exitcode < 0) {
1098 fprintf(stderr, "Remote process exit code unavailable\n");
1099 exitcode = 1; /* this is an error condition */
1100 }
1101 cleanup_exit(exitcode);
1102 return exitcode; /* shouldn't happen, but placates gcc */
1103 }
Local modifications for Simon Tatham's `PuTTY' SSH client and terminal emulator