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Patch from Robert de Bath to substantially simplify timing.c.
[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 return fontspec_new("");
131 }
132
133 Filename *platform_default_filename(const char *name)
134 {
135 if (!strcmp(name, "LogFileName"))
136 return filename_from_str("putty.log");
137 else
138 return filename_from_str("");
139 }
140
141 char *x_get_default(const char *key)
142 {
143 return NULL; /* this is a stub */
144 }
145 int term_ldisc(Terminal *term, int mode)
146 {
147 return FALSE;
148 }
149 void ldisc_update(void *frontend, int echo, int edit)
150 {
151 /* Update stdin read mode to reflect changes in line discipline. */
152 struct termios mode;
153
154 if (!local_tty) return;
155
156 mode = orig_termios;
157
158 if (echo)
159 mode.c_lflag |= ECHO;
160 else
161 mode.c_lflag &= ~ECHO;
162
163 if (edit) {
164 mode.c_iflag |= ICRNL;
165 mode.c_lflag |= ISIG | ICANON;
166 mode.c_oflag |= OPOST;
167 } else {
168 mode.c_iflag &= ~ICRNL;
169 mode.c_lflag &= ~(ISIG | ICANON);
170 mode.c_oflag &= ~OPOST;
171 /* Solaris sets these to unhelpful values */
172 mode.c_cc[VMIN] = 1;
173 mode.c_cc[VTIME] = 0;
174 /* FIXME: perhaps what we do with IXON/IXOFF should be an
175 * argument to ldisc_update(), to allow implementation of SSH-2
176 * "xon-xoff" and Rlogin's equivalent? */
177 mode.c_iflag &= ~IXON;
178 mode.c_iflag &= ~IXOFF;
179 }
180 /*
181 * Mark parity errors and (more important) BREAK on input. This
182 * is more complex than it need be because POSIX-2001 suggests
183 * that escaping of valid 0xff in the input stream is dependent on
184 * IGNPAR being clear even though marking of BREAK isn't. NetBSD
185 * 2.0 goes one worse and makes it dependent on INPCK too. We
186 * deal with this by forcing these flags into a useful state and
187 * then faking the state in which we found them in from_tty() if
188 * we get passed a parity or framing error.
189 */
190 mode.c_iflag = (mode.c_iflag | INPCK | PARMRK) & ~IGNPAR;
191
192 tcsetattr(STDIN_FILENO, TCSANOW, &mode);
193 }
194
195 /* Helper function to extract a special character from a termios. */
196 static char *get_ttychar(struct termios *t, int index)
197 {
198 cc_t c = t->c_cc[index];
199 #if defined(_POSIX_VDISABLE)
200 if (c == _POSIX_VDISABLE)
201 return dupprintf("");
202 #endif
203 return dupprintf("^<%d>", c);
204 }
205
206 char *get_ttymode(void *frontend, const char *mode)
207 {
208 /*
209 * Propagate appropriate terminal modes from the local terminal,
210 * if any.
211 */
212 if (!local_tty) return NULL;
213
214 #define GET_CHAR(ourname, uxname) \
215 do { \
216 if (strcmp(mode, ourname) == 0) \
217 return get_ttychar(&orig_termios, uxname); \
218 } while(0)
219 #define GET_BOOL(ourname, uxname, uxmemb, transform) \
220 do { \
221 if (strcmp(mode, ourname) == 0) { \
222 int b = (orig_termios.uxmemb & uxname) != 0; \
223 transform; \
224 return dupprintf("%d", b); \
225 } \
226 } while (0)
227
228 /*
229 * Modes that want to be the same on all terminal devices involved.
230 */
231 /* All the special characters supported by SSH */
232 #if defined(VINTR)
233 GET_CHAR("INTR", VINTR);
234 #endif
235 #if defined(VQUIT)
236 GET_CHAR("QUIT", VQUIT);
237 #endif
238 #if defined(VERASE)
239 GET_CHAR("ERASE", VERASE);
240 #endif
241 #if defined(VKILL)
242 GET_CHAR("KILL", VKILL);
243 #endif
244 #if defined(VEOF)
245 GET_CHAR("EOF", VEOF);
246 #endif
247 #if defined(VEOL)
248 GET_CHAR("EOL", VEOL);
249 #endif
250 #if defined(VEOL2)
251 GET_CHAR("EOL2", VEOL2);
252 #endif
253 #if defined(VSTART)
254 GET_CHAR("START", VSTART);
255 #endif
256 #if defined(VSTOP)
257 GET_CHAR("STOP", VSTOP);
258 #endif
259 #if defined(VSUSP)
260 GET_CHAR("SUSP", VSUSP);
261 #endif
262 #if defined(VDSUSP)
263 GET_CHAR("DSUSP", VDSUSP);
264 #endif
265 #if defined(VREPRINT)
266 GET_CHAR("REPRINT", VREPRINT);
267 #endif
268 #if defined(VWERASE)
269 GET_CHAR("WERASE", VWERASE);
270 #endif
271 #if defined(VLNEXT)
272 GET_CHAR("LNEXT", VLNEXT);
273 #endif
274 #if defined(VFLUSH)
275 GET_CHAR("FLUSH", VFLUSH);
276 #endif
277 #if defined(VSWTCH)
278 GET_CHAR("SWTCH", VSWTCH);
279 #endif
280 #if defined(VSTATUS)
281 GET_CHAR("STATUS", VSTATUS);
282 #endif
283 #if defined(VDISCARD)
284 GET_CHAR("DISCARD", VDISCARD);
285 #endif
286 /* Modes that "configure" other major modes. These should probably be
287 * considered as user preferences. */
288 /* Configuration of ICANON */
289 #if defined(ECHOK)
290 GET_BOOL("ECHOK", ECHOK, c_lflag, );
291 #endif
292 #if defined(ECHOKE)
293 GET_BOOL("ECHOKE", ECHOKE, c_lflag, );
294 #endif
295 #if defined(ECHOE)
296 GET_BOOL("ECHOE", ECHOE, c_lflag, );
297 #endif
298 #if defined(ECHONL)
299 GET_BOOL("ECHONL", ECHONL, c_lflag, );
300 #endif
301 #if defined(XCASE)
302 GET_BOOL("XCASE", XCASE, c_lflag, );
303 #endif
304 /* Configuration of ECHO */
305 #if defined(ECHOCTL)
306 GET_BOOL("ECHOCTL", ECHOCTL, c_lflag, );
307 #endif
308 /* Configuration of IXON/IXOFF */
309 #if defined(IXANY)
310 GET_BOOL("IXANY", IXANY, c_iflag, );
311 #endif
312 /* Configuration of OPOST */
313 #if defined(OLCUC)
314 GET_BOOL("OLCUC", OLCUC, c_oflag, );
315 #endif
316 #if defined(ONLCR)
317 GET_BOOL("ONLCR", ONLCR, c_oflag, );
318 #endif
319 #if defined(OCRNL)
320 GET_BOOL("OCRNL", OCRNL, c_oflag, );
321 #endif
322 #if defined(ONOCR)
323 GET_BOOL("ONOCR", ONOCR, c_oflag, );
324 #endif
325 #if defined(ONLRET)
326 GET_BOOL("ONLRET", ONLRET, c_oflag, );
327 #endif
328
329 /*
330 * Modes that want to be set in only one place, and that we have
331 * squashed locally.
332 */
333 #if defined(ISIG)
334 GET_BOOL("ISIG", ISIG, c_lflag, );
335 #endif
336 #if defined(ICANON)
337 GET_BOOL("ICANON", ICANON, c_lflag, );
338 #endif
339 #if defined(ECHO)
340 GET_BOOL("ECHO", ECHO, c_lflag, );
341 #endif
342 #if defined(IXON)
343 GET_BOOL("IXON", IXON, c_iflag, );
344 #endif
345 #if defined(IXOFF)
346 GET_BOOL("IXOFF", IXOFF, c_iflag, );
347 #endif
348 #if defined(OPOST)
349 GET_BOOL("OPOST", OPOST, c_oflag, );
350 #endif
351
352 /*
353 * We do not propagate the following modes:
354 * - Parity/serial settings, which are a local affair and don't
355 * make sense propagated over SSH's 8-bit byte-stream.
356 * IGNPAR PARMRK INPCK CS7 CS8 PARENB PARODD
357 * - Things that want to be enabled in one place that we don't
358 * squash locally.
359 * IUCLC
360 * - Status bits.
361 * PENDIN
362 * - Things I don't know what to do with. (FIXME)
363 * ISTRIP IMAXBEL NOFLSH TOSTOP IEXTEN
364 * INLCR IGNCR ICRNL
365 */
366
367 #undef GET_CHAR
368 #undef GET_BOOL
369
370 /* Fall through to here for unrecognised names, or ones that are
371 * unsupported on this platform */
372 return NULL;
373 }
374
375 void cleanup_termios(void)
376 {
377 if (local_tty)
378 tcsetattr(STDIN_FILENO, TCSANOW, &orig_termios);
379 }
380
381 bufchain stdout_data, stderr_data;
382 enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof;
383
384 int try_output(int is_stderr)
385 {
386 bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
387 int fd = (is_stderr ? STDERR_FILENO : STDOUT_FILENO);
388 void *senddata;
389 int sendlen, ret, fl;
390
391 if (bufchain_size(chain) > 0) {
392 fl = fcntl(fd, F_GETFL);
393 if (fl != -1 && !(fl & O_NONBLOCK))
394 fcntl(fd, F_SETFL, fl | O_NONBLOCK);
395 do {
396 bufchain_prefix(chain, &senddata, &sendlen);
397 ret = write(fd, senddata, sendlen);
398 if (ret > 0)
399 bufchain_consume(chain, ret);
400 } while (ret == sendlen && bufchain_size(chain) != 0);
401 if (fl != -1 && !(fl & O_NONBLOCK))
402 fcntl(fd, F_SETFL, fl);
403 if (ret < 0 && errno != EAGAIN) {
404 perror(is_stderr ? "stderr: write" : "stdout: write");
405 exit(1);
406 }
407 }
408 if (outgoingeof == EOF_PENDING && bufchain_size(&stdout_data) == 0) {
409 close(STDOUT_FILENO);
410 outgoingeof = EOF_SENT;
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 assert(outgoingeof == EOF_NO);
423 bufchain_add(&stdout_data, data, len);
424 return try_output(FALSE);
425 }
426 }
427
428 int from_backend_untrusted(void *frontend_handle, const char *data, int len)
429 {
430 /*
431 * No "untrusted" output should get here (the way the code is
432 * currently, it's all diverted by FLAG_STDERR).
433 */
434 assert(!"Unexpected call to from_backend_untrusted()");
435 return 0; /* not reached */
436 }
437
438 int from_backend_eof(void *frontend_handle)
439 {
440 assert(outgoingeof == EOF_NO);
441 outgoingeof = EOF_PENDING;
442 try_output(FALSE);
443 return FALSE; /* do not respond to incoming EOF with outgoing */
444 }
445
446 int get_userpass_input(prompts_t *p, unsigned char *in, int inlen)
447 {
448 int ret;
449 ret = cmdline_get_passwd_input(p, in, inlen);
450 if (ret == -1)
451 ret = console_get_userpass_input(p, in, inlen);
452 return ret;
453 }
454
455 /*
456 * Handle data from a local tty in PARMRK format.
457 */
458 static void from_tty(void *vbuf, unsigned len)
459 {
460 char *p, *q, *end, *buf = vbuf;
461 static enum {NORMAL, FF, FF00} state = NORMAL;
462
463 p = buf; end = buf + len;
464 while (p < end) {
465 switch (state) {
466 case NORMAL:
467 if (*p == '\xff') {
468 p++;
469 state = FF;
470 } else {
471 q = memchr(p, '\xff', end - p);
472 if (q == NULL) q = end;
473 back->send(backhandle, p, q - p);
474 p = q;
475 }
476 break;
477 case FF:
478 if (*p == '\xff') {
479 back->send(backhandle, p, 1);
480 p++;
481 state = NORMAL;
482 } else if (*p == '\0') {
483 p++;
484 state = FF00;
485 } else abort();
486 break;
487 case FF00:
488 if (*p == '\0') {
489 back->special(backhandle, TS_BRK);
490 } else {
491 /*
492 * Pretend that PARMRK wasn't set. This involves
493 * faking what INPCK and IGNPAR would have done if
494 * we hadn't overridden them. Unfortunately, we
495 * can't do this entirely correctly because INPCK
496 * distinguishes between framing and parity
497 * errors, but PARMRK format represents both in
498 * the same way. We assume that parity errors are
499 * more common than framing errors, and hence
500 * treat all input errors as being subject to
501 * INPCK.
502 */
503 if (orig_termios.c_iflag & INPCK) {
504 /* If IGNPAR is set, we throw away the character. */
505 if (!(orig_termios.c_iflag & IGNPAR)) {
506 /* PE/FE get passed on as NUL. */
507 *p = 0;
508 back->send(backhandle, p, 1);
509 }
510 } else {
511 /* INPCK not set. Assume we got a parity error. */
512 back->send(backhandle, p, 1);
513 }
514 }
515 p++;
516 state = NORMAL;
517 }
518 }
519 }
520
521 int signalpipe[2];
522
523 void sigwinch(int signum)
524 {
525 if (write(signalpipe[1], "x", 1) <= 0)
526 /* not much we can do about it */;
527 }
528
529 /*
530 * In Plink our selects are synchronous, so these functions are
531 * empty stubs.
532 */
533 int uxsel_input_add(int fd, int rwx) { return 0; }
534 void uxsel_input_remove(int id) { }
535
536 /*
537 * Short description of parameters.
538 */
539 static void usage(void)
540 {
541 printf("PuTTY Link: command-line connection utility\n");
542 printf("%s\n", ver);
543 printf("Usage: plink [options] [user@]host [command]\n");
544 printf(" (\"host\" can also be a PuTTY saved session name)\n");
545 printf("Options:\n");
546 printf(" -V print version information and exit\n");
547 printf(" -pgpfp print PGP key fingerprints and exit\n");
548 printf(" -v show verbose messages\n");
549 printf(" -load sessname Load settings from saved session\n");
550 printf(" -ssh -telnet -rlogin -raw -serial\n");
551 printf(" force use of a particular protocol\n");
552 printf(" -P port connect to specified port\n");
553 printf(" -l user connect with specified username\n");
554 printf(" -batch disable all interactive prompts\n");
555 printf("The following options only apply to SSH connections:\n");
556 printf(" -pw passw login with specified password\n");
557 printf(" -D [listen-IP:]listen-port\n");
558 printf(" Dynamic SOCKS-based port forwarding\n");
559 printf(" -L [listen-IP:]listen-port:host:port\n");
560 printf(" Forward local port to remote address\n");
561 printf(" -R [listen-IP:]listen-port:host:port\n");
562 printf(" Forward remote port to local address\n");
563 printf(" -X -x enable / disable X11 forwarding\n");
564 printf(" -A -a enable / disable agent forwarding\n");
565 printf(" -t -T enable / disable pty allocation\n");
566 printf(" -1 -2 force use of particular protocol version\n");
567 printf(" -4 -6 force use of IPv4 or IPv6\n");
568 printf(" -C enable compression\n");
569 printf(" -i key private key file for authentication\n");
570 printf(" -noagent disable use of Pageant\n");
571 printf(" -agent enable use of Pageant\n");
572 printf(" -m file read remote command(s) from file\n");
573 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
574 printf(" -N don't start a shell/command (SSH-2 only)\n");
575 printf(" -nc host:port\n");
576 printf(" open tunnel in place of session (SSH-2 only)\n");
577 printf(" -sercfg configuration-string (e.g. 19200,8,n,1,X)\n");
578 printf(" Specify the serial configuration (serial only)\n");
579 exit(1);
580 }
581
582 static void version(void)
583 {
584 printf("plink: %s\n", ver);
585 exit(1);
586 }
587
588 void frontend_net_error_pending(void) {}
589
590 int main(int argc, char **argv)
591 {
592 int sending;
593 int portnumber = -1;
594 int *fdlist;
595 int fd;
596 int i, fdcount, fdsize, fdstate;
597 int connopen;
598 int exitcode;
599 int errors;
600 int use_subsystem = 0;
601 int got_host = FALSE;
602 long now;
603
604 fdlist = NULL;
605 fdcount = fdsize = 0;
606 /*
607 * Initialise port and protocol to sensible defaults. (These
608 * will be overridden by more or less anything.)
609 */
610 default_protocol = PROT_SSH;
611 default_port = 22;
612
613 bufchain_init(&stdout_data);
614 bufchain_init(&stderr_data);
615 outgoingeof = EOF_NO;
616
617 flags = FLAG_STDERR | FLAG_STDERR_TTY;
618
619 stderr_tty_init();
620 /*
621 * Process the command line.
622 */
623 conf = conf_new();
624 do_defaults(NULL, conf);
625 loaded_session = FALSE;
626 default_protocol = conf_get_int(conf, CONF_protocol);
627 default_port = conf_get_int(conf, CONF_port);
628 errors = 0;
629 {
630 /*
631 * Override the default protocol if PLINK_PROTOCOL is set.
632 */
633 char *p = getenv("PLINK_PROTOCOL");
634 if (p) {
635 const Backend *b = backend_from_name(p);
636 if (b) {
637 default_protocol = b->protocol;
638 default_port = b->default_port;
639 conf_set_int(conf, CONF_protocol, default_protocol);
640 conf_set_int(conf, CONF_port, default_port);
641 }
642 }
643 }
644 while (--argc) {
645 char *p = *++argv;
646 if (*p == '-') {
647 int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
648 1, conf);
649 if (ret == -2) {
650 fprintf(stderr,
651 "plink: option \"%s\" requires an argument\n", p);
652 errors = 1;
653 } else if (ret == 2) {
654 --argc, ++argv;
655 } else if (ret == 1) {
656 continue;
657 } else if (!strcmp(p, "-batch")) {
658 console_batch_mode = 1;
659 } else if (!strcmp(p, "-s")) {
660 /* Save status to write to conf later. */
661 use_subsystem = 1;
662 } else if (!strcmp(p, "-V")) {
663 version();
664 } else if (!strcmp(p, "-pgpfp")) {
665 pgp_fingerprints();
666 exit(1);
667 } else if (!strcmp(p, "-o")) {
668 if (argc <= 1) {
669 fprintf(stderr,
670 "plink: option \"-o\" requires an argument\n");
671 errors = 1;
672 } else {
673 --argc;
674 provide_xrm_string(*++argv);
675 }
676 } else {
677 fprintf(stderr, "plink: unknown option \"%s\"\n", p);
678 errors = 1;
679 }
680 } else if (*p) {
681 if (!conf_launchable(conf) || !(got_host || loaded_session)) {
682 char *q = p;
683
684 /*
685 * If the hostname starts with "telnet:", set the
686 * protocol to Telnet and process the string as a
687 * Telnet URL.
688 */
689 if (!strncmp(q, "telnet:", 7)) {
690 char c;
691
692 q += 7;
693 if (q[0] == '/' && q[1] == '/')
694 q += 2;
695 conf_set_int(conf, CONF_protocol, PROT_TELNET);
696 p = q;
697 while (*p && *p != ':' && *p != '/')
698 p++;
699 c = *p;
700 if (*p)
701 *p++ = '\0';
702 if (c == ':')
703 conf_set_int(conf, CONF_port, atoi(p));
704 else
705 conf_set_int(conf, CONF_port, -1);
706 conf_set_str(conf, CONF_host, q);
707 got_host = TRUE;
708 } else {
709 char *r, *user, *host;
710 /*
711 * Before we process the [user@]host string, we
712 * first check for the presence of a protocol
713 * prefix (a protocol name followed by ",").
714 */
715 r = strchr(p, ',');
716 if (r) {
717 const Backend *b;
718 *r = '\0';
719 b = backend_from_name(p);
720 if (b) {
721 default_protocol = b->protocol;
722 conf_set_int(conf, CONF_protocol,
723 default_protocol);
724 portnumber = b->default_port;
725 }
726 p = r + 1;
727 }
728
729 /*
730 * A nonzero length string followed by an @ is treated
731 * as a username. (We discount an _initial_ @.) The
732 * rest of the string (or the whole string if no @)
733 * is treated as a session name and/or hostname.
734 */
735 r = strrchr(p, '@');
736 if (r == p)
737 p++, r = NULL; /* discount initial @ */
738 if (r) {
739 *r++ = '\0';
740 user = p, host = r;
741 } else {
742 user = NULL, host = p;
743 }
744
745 /*
746 * Now attempt to load a saved session with the
747 * same name as the hostname.
748 */
749 {
750 Conf *conf2 = conf_new();
751 do_defaults(host, conf2);
752 if (loaded_session || !conf_launchable(conf2)) {
753 /* No settings for this host; use defaults */
754 /* (or session was already loaded with -load) */
755 conf_set_str(conf, CONF_host, host);
756 conf_set_int(conf, CONF_port, default_port);
757 got_host = TRUE;
758 } else {
759 conf_copy_into(conf, conf2);
760 loaded_session = TRUE;
761 }
762 conf_free(conf2);
763 }
764
765 if (user) {
766 /* Patch in specified username. */
767 conf_set_str(conf, CONF_username, user);
768 }
769
770 }
771 } else {
772 char *command;
773 int cmdlen, cmdsize;
774 cmdlen = cmdsize = 0;
775 command = NULL;
776
777 while (argc) {
778 while (*p) {
779 if (cmdlen >= cmdsize) {
780 cmdsize = cmdlen + 512;
781 command = sresize(command, cmdsize, char);
782 }
783 command[cmdlen++]=*p++;
784 }
785 if (cmdlen >= cmdsize) {
786 cmdsize = cmdlen + 512;
787 command = sresize(command, cmdsize, char);
788 }
789 command[cmdlen++]=' '; /* always add trailing space */
790 if (--argc) p = *++argv;
791 }
792 if (cmdlen) command[--cmdlen]='\0';
793 /* change trailing blank to NUL */
794 conf_set_str(conf, CONF_remote_cmd, command);
795 conf_set_str(conf, CONF_remote_cmd2, "");
796 conf_set_int(conf, CONF_nopty, TRUE); /* command => no tty */
797
798 break; /* done with cmdline */
799 }
800 }
801 }
802
803 if (errors)
804 return 1;
805
806 if (!conf_launchable(conf) || !(got_host || loaded_session)) {
807 usage();
808 }
809
810 /*
811 * Muck about with the hostname in various ways.
812 */
813 {
814 char *hostbuf = dupstr(conf_get_str(conf, CONF_host));
815 char *host = hostbuf;
816 char *p, *q;
817
818 /*
819 * Trim leading whitespace.
820 */
821 host += strspn(host, " \t");
822
823 /*
824 * See if host is of the form user@host, and separate out
825 * the username if so.
826 */
827 if (host[0] != '\0') {
828 char *atsign = strrchr(host, '@');
829 if (atsign) {
830 *atsign = '\0';
831 conf_set_str(conf, CONF_username, host);
832 host = atsign + 1;
833 }
834 }
835
836 /*
837 * Trim off a colon suffix if it's there.
838 */
839 host[strcspn(host, ":")] = '\0';
840
841 /*
842 * Remove any remaining whitespace.
843 */
844 p = hostbuf;
845 q = host;
846 while (*q) {
847 if (*q != ' ' && *q != '\t')
848 *p++ = *q;
849 q++;
850 }
851 *p = '\0';
852
853 conf_set_str(conf, CONF_host, hostbuf);
854 sfree(hostbuf);
855 }
856
857 /*
858 * Perform command-line overrides on session configuration.
859 */
860 cmdline_run_saved(conf);
861
862 /*
863 * Apply subsystem status.
864 */
865 if (use_subsystem)
866 conf_set_int(conf, CONF_ssh_subsys, TRUE);
867
868 if (!*conf_get_str(conf, CONF_remote_cmd) &&
869 !*conf_get_str(conf, CONF_remote_cmd2) &&
870 !*conf_get_str(conf, CONF_ssh_nc_host))
871 flags |= FLAG_INTERACTIVE;
872
873 /*
874 * Select protocol. This is farmed out into a table in a
875 * separate file to enable an ssh-free variant.
876 */
877 back = backend_from_proto(conf_get_int(conf, CONF_protocol));
878 if (back == NULL) {
879 fprintf(stderr,
880 "Internal fault: Unsupported protocol found\n");
881 return 1;
882 }
883
884 /*
885 * Select port.
886 */
887 if (portnumber != -1)
888 conf_set_int(conf, CONF_port, portnumber);
889
890 /*
891 * Block SIGPIPE, so that we'll get EPIPE individually on
892 * particular network connections that go wrong.
893 */
894 putty_signal(SIGPIPE, SIG_IGN);
895
896 /*
897 * Set up the pipe we'll use to tell us about SIGWINCH.
898 */
899 if (pipe(signalpipe) < 0) {
900 perror("pipe");
901 exit(1);
902 }
903 putty_signal(SIGWINCH, sigwinch);
904
905 sk_init();
906 uxsel_init();
907
908 /*
909 * Unix Plink doesn't provide any way to add forwardings after the
910 * connection is set up, so if there are none now, we can safely set
911 * the "simple" flag.
912 */
913 if (conf_get_int(conf, CONF_protocol) == PROT_SSH &&
914 !conf_get_int(conf, CONF_x11_forward) &&
915 !conf_get_int(conf, CONF_agentfwd) &&
916 !conf_get_str_nthstrkey(conf, CONF_portfwd, 0))
917 conf_set_int(conf, CONF_ssh_simple, TRUE);
918
919 /*
920 * Start up the connection.
921 */
922 logctx = log_init(NULL, conf);
923 console_provide_logctx(logctx);
924 {
925 const char *error;
926 char *realhost;
927 /* nodelay is only useful if stdin is a terminal device */
928 int nodelay = conf_get_int(conf, CONF_tcp_nodelay) && isatty(0);
929
930 error = back->init(NULL, &backhandle, conf,
931 conf_get_str(conf, CONF_host),
932 conf_get_int(conf, CONF_port),
933 &realhost, nodelay,
934 conf_get_int(conf, CONF_tcp_keepalives));
935 if (error) {
936 fprintf(stderr, "Unable to open connection:\n%s\n", error);
937 return 1;
938 }
939 back->provide_logctx(backhandle, logctx);
940 ldisc_create(conf, NULL, back, backhandle, NULL);
941 sfree(realhost);
942 }
943 connopen = 1;
944
945 /*
946 * Set up the initial console mode. We don't care if this call
947 * fails, because we know we aren't necessarily running in a
948 * console.
949 */
950 local_tty = (tcgetattr(STDIN_FILENO, &orig_termios) == 0);
951 atexit(cleanup_termios);
952 ldisc_update(NULL, 1, 1);
953 sending = FALSE;
954 now = GETTICKCOUNT();
955
956 while (1) {
957 fd_set rset, wset, xset;
958 int maxfd;
959 int rwx;
960 int ret;
961
962 FD_ZERO(&rset);
963 FD_ZERO(&wset);
964 FD_ZERO(&xset);
965 maxfd = 0;
966
967 FD_SET_MAX(signalpipe[0], maxfd, rset);
968
969 if (connopen && !sending &&
970 back->connected(backhandle) &&
971 back->sendok(backhandle) &&
972 back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
973 /* If we're OK to send, then try to read from stdin. */
974 FD_SET_MAX(STDIN_FILENO, maxfd, rset);
975 }
976
977 if (bufchain_size(&stdout_data) > 0) {
978 /* If we have data for stdout, try to write to stdout. */
979 FD_SET_MAX(STDOUT_FILENO, maxfd, wset);
980 }
981
982 if (bufchain_size(&stderr_data) > 0) {
983 /* If we have data for stderr, try to write to stderr. */
984 FD_SET_MAX(STDERR_FILENO, maxfd, wset);
985 }
986
987 /* Count the currently active fds. */
988 i = 0;
989 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
990 fd = next_fd(&fdstate, &rwx)) i++;
991
992 /* Expand the fdlist buffer if necessary. */
993 if (i > fdsize) {
994 fdsize = i + 16;
995 fdlist = sresize(fdlist, fdsize, int);
996 }
997
998 /*
999 * Add all currently open fds to the select sets, and store
1000 * them in fdlist as well.
1001 */
1002 fdcount = 0;
1003 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
1004 fd = next_fd(&fdstate, &rwx)) {
1005 fdlist[fdcount++] = fd;
1006 if (rwx & 1)
1007 FD_SET_MAX(fd, maxfd, rset);
1008 if (rwx & 2)
1009 FD_SET_MAX(fd, maxfd, wset);
1010 if (rwx & 4)
1011 FD_SET_MAX(fd, maxfd, xset);
1012 }
1013
1014 do {
1015 long next, ticks;
1016 struct timeval tv, *ptv;
1017
1018 if (run_timers(now, &next)) {
1019 ticks = next - GETTICKCOUNT();
1020 if (ticks < 0) ticks = 0; /* just in case */
1021 tv.tv_sec = ticks / 1000;
1022 tv.tv_usec = ticks % 1000 * 1000;
1023 ptv = &tv;
1024 } else {
1025 ptv = NULL;
1026 }
1027 ret = select(maxfd, &rset, &wset, &xset, ptv);
1028 if (ret == 0)
1029 now = next;
1030 else
1031 now = GETTICKCOUNT();
1032 } while (ret < 0 && errno == EINTR);
1033
1034 if (ret < 0) {
1035 perror("select");
1036 exit(1);
1037 }
1038
1039 for (i = 0; i < fdcount; i++) {
1040 fd = fdlist[i];
1041 /*
1042 * We must process exceptional notifications before
1043 * ordinary readability ones, or we may go straight
1044 * past the urgent marker.
1045 */
1046 if (FD_ISSET(fd, &xset))
1047 select_result(fd, 4);
1048 if (FD_ISSET(fd, &rset))
1049 select_result(fd, 1);
1050 if (FD_ISSET(fd, &wset))
1051 select_result(fd, 2);
1052 }
1053
1054 if (FD_ISSET(signalpipe[0], &rset)) {
1055 char c[1];
1056 struct winsize size;
1057 if (read(signalpipe[0], c, 1) <= 0)
1058 /* ignore error */;
1059 /* ignore its value; it'll be `x' */
1060 if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
1061 back->size(backhandle, size.ws_col, size.ws_row);
1062 }
1063
1064 if (FD_ISSET(STDIN_FILENO, &rset)) {
1065 char buf[4096];
1066 int ret;
1067
1068 if (connopen && back->connected(backhandle)) {
1069 ret = read(STDIN_FILENO, buf, sizeof(buf));
1070 if (ret < 0) {
1071 perror("stdin: read");
1072 exit(1);
1073 } else if (ret == 0) {
1074 back->special(backhandle, TS_EOF);
1075 sending = FALSE; /* send nothing further after this */
1076 } else {
1077 if (local_tty)
1078 from_tty(buf, ret);
1079 else
1080 back->send(backhandle, buf, ret);
1081 }
1082 }
1083 }
1084
1085 if (FD_ISSET(STDOUT_FILENO, &wset)) {
1086 back->unthrottle(backhandle, try_output(FALSE));
1087 }
1088
1089 if (FD_ISSET(STDERR_FILENO, &wset)) {
1090 back->unthrottle(backhandle, try_output(TRUE));
1091 }
1092
1093 net_pending_errors();
1094
1095 if ((!connopen || !back->connected(backhandle)) &&
1096 bufchain_size(&stdout_data) == 0 &&
1097 bufchain_size(&stderr_data) == 0)
1098 break; /* we closed the connection */
1099 }
1100 exitcode = back->exitcode(backhandle);
1101 if (exitcode < 0) {
1102 fprintf(stderr, "Remote process exit code unavailable\n");
1103 exitcode = 1; /* this is an error condition */
1104 }
1105 cleanup_exit(exitcode);
1106 return exitcode; /* shouldn't happen, but placates gcc */
1107 }
Local modifications for Simon Tatham's `PuTTY' SSH client and terminal emulator