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9e10c488c2e1c635d82740d4eaef75ed127f4bc8
[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 nonfatal(char *p, ...)
67 {
68 struct termios cf;
69 va_list ap;
70 premsg(&cf);
71 fprintf(stderr, "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 }
82 void connection_fatal(void *frontend, char *p, ...)
83 {
84 struct termios cf;
85 va_list ap;
86 premsg(&cf);
87 fprintf(stderr, "FATAL ERROR: ");
88 va_start(ap, p);
89 vfprintf(stderr, p, ap);
90 va_end(ap);
91 fputc('\n', stderr);
92 postmsg(&cf);
93 if (logctx) {
94 log_free(logctx);
95 logctx = NULL;
96 }
97 cleanup_exit(1);
98 }
99 void cmdline_error(char *p, ...)
100 {
101 struct termios cf;
102 va_list ap;
103 premsg(&cf);
104 fprintf(stderr, "plink: ");
105 va_start(ap, p);
106 vfprintf(stderr, p, ap);
107 va_end(ap);
108 fputc('\n', stderr);
109 postmsg(&cf);
110 exit(1);
111 }
112
113 static int local_tty = FALSE; /* do we have a local tty? */
114
115 static Backend *back;
116 static void *backhandle;
117 static Conf *conf;
118
119 /*
120 * Default settings that are specific to pterm.
121 */
122 char *platform_default_s(const char *name)
123 {
124 if (!strcmp(name, "TermType"))
125 return dupstr(getenv("TERM"));
126 if (!strcmp(name, "UserName"))
127 return get_username();
128 if (!strcmp(name, "SerialLine"))
129 return dupstr("/dev/ttyS0");
130 return NULL;
131 }
132
133 int platform_default_i(const char *name, int def)
134 {
135 return def;
136 }
137
138 FontSpec *platform_default_fontspec(const char *name)
139 {
140 return fontspec_new("");
141 }
142
143 Filename *platform_default_filename(const char *name)
144 {
145 if (!strcmp(name, "LogFileName"))
146 return filename_from_str("putty.log");
147 else
148 return filename_from_str("");
149 }
150
151 char *x_get_default(const char *key)
152 {
153 return NULL; /* this is a stub */
154 }
155 int term_ldisc(Terminal *term, int mode)
156 {
157 return FALSE;
158 }
159 void ldisc_update(void *frontend, int echo, int edit)
160 {
161 /* Update stdin read mode to reflect changes in line discipline. */
162 struct termios mode;
163
164 if (!local_tty) return;
165
166 mode = orig_termios;
167
168 if (echo)
169 mode.c_lflag |= ECHO;
170 else
171 mode.c_lflag &= ~ECHO;
172
173 if (edit) {
174 mode.c_iflag |= ICRNL;
175 mode.c_lflag |= ISIG | ICANON;
176 mode.c_oflag |= OPOST;
177 } else {
178 mode.c_iflag &= ~ICRNL;
179 mode.c_lflag &= ~(ISIG | ICANON);
180 mode.c_oflag &= ~OPOST;
181 /* Solaris sets these to unhelpful values */
182 mode.c_cc[VMIN] = 1;
183 mode.c_cc[VTIME] = 0;
184 /* FIXME: perhaps what we do with IXON/IXOFF should be an
185 * argument to ldisc_update(), to allow implementation of SSH-2
186 * "xon-xoff" and Rlogin's equivalent? */
187 mode.c_iflag &= ~IXON;
188 mode.c_iflag &= ~IXOFF;
189 }
190 /*
191 * Mark parity errors and (more important) BREAK on input. This
192 * is more complex than it need be because POSIX-2001 suggests
193 * that escaping of valid 0xff in the input stream is dependent on
194 * IGNPAR being clear even though marking of BREAK isn't. NetBSD
195 * 2.0 goes one worse and makes it dependent on INPCK too. We
196 * deal with this by forcing these flags into a useful state and
197 * then faking the state in which we found them in from_tty() if
198 * we get passed a parity or framing error.
199 */
200 mode.c_iflag = (mode.c_iflag | INPCK | PARMRK) & ~IGNPAR;
201
202 tcsetattr(STDIN_FILENO, TCSANOW, &mode);
203 }
204
205 /* Helper function to extract a special character from a termios. */
206 static char *get_ttychar(struct termios *t, int index)
207 {
208 cc_t c = t->c_cc[index];
209 #if defined(_POSIX_VDISABLE)
210 if (c == _POSIX_VDISABLE)
211 return dupprintf("");
212 #endif
213 return dupprintf("^<%d>", c);
214 }
215
216 char *get_ttymode(void *frontend, const char *mode)
217 {
218 /*
219 * Propagate appropriate terminal modes from the local terminal,
220 * if any.
221 */
222 if (!local_tty) return NULL;
223
224 #define GET_CHAR(ourname, uxname) \
225 do { \
226 if (strcmp(mode, ourname) == 0) \
227 return get_ttychar(&orig_termios, uxname); \
228 } while(0)
229 #define GET_BOOL(ourname, uxname, uxmemb, transform) \
230 do { \
231 if (strcmp(mode, ourname) == 0) { \
232 int b = (orig_termios.uxmemb & uxname) != 0; \
233 transform; \
234 return dupprintf("%d", b); \
235 } \
236 } while (0)
237
238 /*
239 * Modes that want to be the same on all terminal devices involved.
240 */
241 /* All the special characters supported by SSH */
242 #if defined(VINTR)
243 GET_CHAR("INTR", VINTR);
244 #endif
245 #if defined(VQUIT)
246 GET_CHAR("QUIT", VQUIT);
247 #endif
248 #if defined(VERASE)
249 GET_CHAR("ERASE", VERASE);
250 #endif
251 #if defined(VKILL)
252 GET_CHAR("KILL", VKILL);
253 #endif
254 #if defined(VEOF)
255 GET_CHAR("EOF", VEOF);
256 #endif
257 #if defined(VEOL)
258 GET_CHAR("EOL", VEOL);
259 #endif
260 #if defined(VEOL2)
261 GET_CHAR("EOL2", VEOL2);
262 #endif
263 #if defined(VSTART)
264 GET_CHAR("START", VSTART);
265 #endif
266 #if defined(VSTOP)
267 GET_CHAR("STOP", VSTOP);
268 #endif
269 #if defined(VSUSP)
270 GET_CHAR("SUSP", VSUSP);
271 #endif
272 #if defined(VDSUSP)
273 GET_CHAR("DSUSP", VDSUSP);
274 #endif
275 #if defined(VREPRINT)
276 GET_CHAR("REPRINT", VREPRINT);
277 #endif
278 #if defined(VWERASE)
279 GET_CHAR("WERASE", VWERASE);
280 #endif
281 #if defined(VLNEXT)
282 GET_CHAR("LNEXT", VLNEXT);
283 #endif
284 #if defined(VFLUSH)
285 GET_CHAR("FLUSH", VFLUSH);
286 #endif
287 #if defined(VSWTCH)
288 GET_CHAR("SWTCH", VSWTCH);
289 #endif
290 #if defined(VSTATUS)
291 GET_CHAR("STATUS", VSTATUS);
292 #endif
293 #if defined(VDISCARD)
294 GET_CHAR("DISCARD", VDISCARD);
295 #endif
296 /* Modes that "configure" other major modes. These should probably be
297 * considered as user preferences. */
298 /* Configuration of ICANON */
299 #if defined(ECHOK)
300 GET_BOOL("ECHOK", ECHOK, c_lflag, );
301 #endif
302 #if defined(ECHOKE)
303 GET_BOOL("ECHOKE", ECHOKE, c_lflag, );
304 #endif
305 #if defined(ECHOE)
306 GET_BOOL("ECHOE", ECHOE, c_lflag, );
307 #endif
308 #if defined(ECHONL)
309 GET_BOOL("ECHONL", ECHONL, c_lflag, );
310 #endif
311 #if defined(XCASE)
312 GET_BOOL("XCASE", XCASE, c_lflag, );
313 #endif
314 /* Configuration of ECHO */
315 #if defined(ECHOCTL)
316 GET_BOOL("ECHOCTL", ECHOCTL, c_lflag, );
317 #endif
318 /* Configuration of IXON/IXOFF */
319 #if defined(IXANY)
320 GET_BOOL("IXANY", IXANY, c_iflag, );
321 #endif
322 /* Configuration of OPOST */
323 #if defined(OLCUC)
324 GET_BOOL("OLCUC", OLCUC, c_oflag, );
325 #endif
326 #if defined(ONLCR)
327 GET_BOOL("ONLCR", ONLCR, c_oflag, );
328 #endif
329 #if defined(OCRNL)
330 GET_BOOL("OCRNL", OCRNL, c_oflag, );
331 #endif
332 #if defined(ONOCR)
333 GET_BOOL("ONOCR", ONOCR, c_oflag, );
334 #endif
335 #if defined(ONLRET)
336 GET_BOOL("ONLRET", ONLRET, c_oflag, );
337 #endif
338
339 /*
340 * Modes that want to be set in only one place, and that we have
341 * squashed locally.
342 */
343 #if defined(ISIG)
344 GET_BOOL("ISIG", ISIG, c_lflag, );
345 #endif
346 #if defined(ICANON)
347 GET_BOOL("ICANON", ICANON, c_lflag, );
348 #endif
349 #if defined(ECHO)
350 GET_BOOL("ECHO", ECHO, c_lflag, );
351 #endif
352 #if defined(IXON)
353 GET_BOOL("IXON", IXON, c_iflag, );
354 #endif
355 #if defined(IXOFF)
356 GET_BOOL("IXOFF", IXOFF, c_iflag, );
357 #endif
358 #if defined(OPOST)
359 GET_BOOL("OPOST", OPOST, c_oflag, );
360 #endif
361
362 /*
363 * We do not propagate the following modes:
364 * - Parity/serial settings, which are a local affair and don't
365 * make sense propagated over SSH's 8-bit byte-stream.
366 * IGNPAR PARMRK INPCK CS7 CS8 PARENB PARODD
367 * - Things that want to be enabled in one place that we don't
368 * squash locally.
369 * IUCLC
370 * - Status bits.
371 * PENDIN
372 * - Things I don't know what to do with. (FIXME)
373 * ISTRIP IMAXBEL NOFLSH TOSTOP IEXTEN
374 * INLCR IGNCR ICRNL
375 */
376
377 #undef GET_CHAR
378 #undef GET_BOOL
379
380 /* Fall through to here for unrecognised names, or ones that are
381 * unsupported on this platform */
382 return NULL;
383 }
384
385 void cleanup_termios(void)
386 {
387 if (local_tty)
388 tcsetattr(STDIN_FILENO, TCSANOW, &orig_termios);
389 }
390
391 bufchain stdout_data, stderr_data;
392 enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof;
393
394 int try_output(int is_stderr)
395 {
396 bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
397 int fd = (is_stderr ? STDERR_FILENO : STDOUT_FILENO);
398 void *senddata;
399 int sendlen, ret, fl;
400
401 if (bufchain_size(chain) > 0) {
402 fl = fcntl(fd, F_GETFL);
403 if (fl != -1 && !(fl & O_NONBLOCK))
404 fcntl(fd, F_SETFL, fl | O_NONBLOCK);
405 do {
406 bufchain_prefix(chain, &senddata, &sendlen);
407 ret = write(fd, senddata, sendlen);
408 if (ret > 0)
409 bufchain_consume(chain, ret);
410 } while (ret == sendlen && bufchain_size(chain) != 0);
411 if (fl != -1 && !(fl & O_NONBLOCK))
412 fcntl(fd, F_SETFL, fl);
413 if (ret < 0 && errno != EAGAIN) {
414 perror(is_stderr ? "stderr: write" : "stdout: write");
415 exit(1);
416 }
417 }
418 if (outgoingeof == EOF_PENDING && bufchain_size(&stdout_data) == 0) {
419 close(STDOUT_FILENO);
420 outgoingeof = EOF_SENT;
421 }
422 return bufchain_size(&stdout_data) + bufchain_size(&stderr_data);
423 }
424
425 int from_backend(void *frontend_handle, int is_stderr,
426 const char *data, int len)
427 {
428 if (is_stderr) {
429 bufchain_add(&stderr_data, data, len);
430 return try_output(TRUE);
431 } else {
432 assert(outgoingeof == EOF_NO);
433 bufchain_add(&stdout_data, data, len);
434 return try_output(FALSE);
435 }
436 }
437
438 int from_backend_untrusted(void *frontend_handle, const char *data, int len)
439 {
440 /*
441 * No "untrusted" output should get here (the way the code is
442 * currently, it's all diverted by FLAG_STDERR).
443 */
444 assert(!"Unexpected call to from_backend_untrusted()");
445 return 0; /* not reached */
446 }
447
448 int from_backend_eof(void *frontend_handle)
449 {
450 assert(outgoingeof == EOF_NO);
451 outgoingeof = EOF_PENDING;
452 try_output(FALSE);
453 return FALSE; /* do not respond to incoming EOF with outgoing */
454 }
455
456 int get_userpass_input(prompts_t *p, unsigned char *in, int inlen)
457 {
458 int ret;
459 ret = cmdline_get_passwd_input(p, in, inlen);
460 if (ret == -1)
461 ret = console_get_userpass_input(p, in, inlen);
462 return ret;
463 }
464
465 /*
466 * Handle data from a local tty in PARMRK format.
467 */
468 static void from_tty(void *vbuf, unsigned len)
469 {
470 char *p, *q, *end, *buf = vbuf;
471 static enum {NORMAL, FF, FF00} state = NORMAL;
472
473 p = buf; end = buf + len;
474 while (p < end) {
475 switch (state) {
476 case NORMAL:
477 if (*p == '\xff') {
478 p++;
479 state = FF;
480 } else {
481 q = memchr(p, '\xff', end - p);
482 if (q == NULL) q = end;
483 back->send(backhandle, p, q - p);
484 p = q;
485 }
486 break;
487 case FF:
488 if (*p == '\xff') {
489 back->send(backhandle, p, 1);
490 p++;
491 state = NORMAL;
492 } else if (*p == '\0') {
493 p++;
494 state = FF00;
495 } else abort();
496 break;
497 case FF00:
498 if (*p == '\0') {
499 back->special(backhandle, TS_BRK);
500 } else {
501 /*
502 * Pretend that PARMRK wasn't set. This involves
503 * faking what INPCK and IGNPAR would have done if
504 * we hadn't overridden them. Unfortunately, we
505 * can't do this entirely correctly because INPCK
506 * distinguishes between framing and parity
507 * errors, but PARMRK format represents both in
508 * the same way. We assume that parity errors are
509 * more common than framing errors, and hence
510 * treat all input errors as being subject to
511 * INPCK.
512 */
513 if (orig_termios.c_iflag & INPCK) {
514 /* If IGNPAR is set, we throw away the character. */
515 if (!(orig_termios.c_iflag & IGNPAR)) {
516 /* PE/FE get passed on as NUL. */
517 *p = 0;
518 back->send(backhandle, p, 1);
519 }
520 } else {
521 /* INPCK not set. Assume we got a parity error. */
522 back->send(backhandle, p, 1);
523 }
524 }
525 p++;
526 state = NORMAL;
527 }
528 }
529 }
530
531 int signalpipe[2];
532
533 void sigwinch(int signum)
534 {
535 if (write(signalpipe[1], "x", 1) <= 0)
536 /* not much we can do about it */;
537 }
538
539 /*
540 * In Plink our selects are synchronous, so these functions are
541 * empty stubs.
542 */
543 int uxsel_input_add(int fd, int rwx) { return 0; }
544 void uxsel_input_remove(int id) { }
545
546 /*
547 * Short description of parameters.
548 */
549 static void usage(void)
550 {
551 printf("PuTTY Link: command-line connection utility\n");
552 printf("%s\n", ver);
553 printf("Usage: plink [options] [user@]host [command]\n");
554 printf(" (\"host\" can also be a PuTTY saved session name)\n");
555 printf("Options:\n");
556 printf(" -V print version information and exit\n");
557 printf(" -pgpfp print PGP key fingerprints and exit\n");
558 printf(" -v show verbose messages\n");
559 printf(" -load sessname Load settings from saved session\n");
560 printf(" -ssh -telnet -rlogin -raw -serial\n");
561 printf(" force use of a particular protocol\n");
562 printf(" -P port connect to specified port\n");
563 printf(" -l user connect with specified username\n");
564 printf(" -batch disable all interactive prompts\n");
565 printf("The following options only apply to SSH connections:\n");
566 printf(" -pw passw login with specified password\n");
567 printf(" -D [listen-IP:]listen-port\n");
568 printf(" Dynamic SOCKS-based port forwarding\n");
569 printf(" -L [listen-IP:]listen-port:host:port\n");
570 printf(" Forward local port to remote address\n");
571 printf(" -R [listen-IP:]listen-port:host:port\n");
572 printf(" Forward remote port to local address\n");
573 printf(" -X -x enable / disable X11 forwarding\n");
574 printf(" -A -a enable / disable agent forwarding\n");
575 printf(" -t -T enable / disable pty allocation\n");
576 printf(" -1 -2 force use of particular protocol version\n");
577 printf(" -4 -6 force use of IPv4 or IPv6\n");
578 printf(" -C enable compression\n");
579 printf(" -i key private key file for authentication\n");
580 printf(" -noagent disable use of Pageant\n");
581 printf(" -agent enable use of Pageant\n");
582 printf(" -m file read remote command(s) from file\n");
583 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
584 printf(" -N don't start a shell/command (SSH-2 only)\n");
585 printf(" -nc host:port\n");
586 printf(" open tunnel in place of session (SSH-2 only)\n");
587 printf(" -sercfg configuration-string (e.g. 19200,8,n,1,X)\n");
588 printf(" Specify the serial configuration (serial only)\n");
589 exit(1);
590 }
591
592 static void version(void)
593 {
594 printf("plink: %s\n", ver);
595 exit(1);
596 }
597
598 void frontend_net_error_pending(void) {}
599
600 int main(int argc, char **argv)
601 {
602 int sending;
603 int portnumber = -1;
604 int *fdlist;
605 int fd;
606 int i, fdcount, fdsize, fdstate;
607 int connopen;
608 int exitcode;
609 int errors;
610 int use_subsystem = 0;
611 int got_host = FALSE;
612 unsigned long now;
613 struct winsize size;
614
615 fdlist = NULL;
616 fdcount = fdsize = 0;
617 /*
618 * Initialise port and protocol to sensible defaults. (These
619 * will be overridden by more or less anything.)
620 */
621 default_protocol = PROT_SSH;
622 default_port = 22;
623
624 bufchain_init(&stdout_data);
625 bufchain_init(&stderr_data);
626 outgoingeof = EOF_NO;
627
628 flags = FLAG_STDERR | FLAG_STDERR_TTY;
629
630 stderr_tty_init();
631 /*
632 * Process the command line.
633 */
634 conf = conf_new();
635 do_defaults(NULL, conf);
636 loaded_session = FALSE;
637 default_protocol = conf_get_int(conf, CONF_protocol);
638 default_port = conf_get_int(conf, CONF_port);
639 errors = 0;
640 {
641 /*
642 * Override the default protocol if PLINK_PROTOCOL is set.
643 */
644 char *p = getenv("PLINK_PROTOCOL");
645 if (p) {
646 const Backend *b = backend_from_name(p);
647 if (b) {
648 default_protocol = b->protocol;
649 default_port = b->default_port;
650 conf_set_int(conf, CONF_protocol, default_protocol);
651 conf_set_int(conf, CONF_port, default_port);
652 }
653 }
654 }
655 while (--argc) {
656 char *p = *++argv;
657 if (*p == '-') {
658 int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
659 1, conf);
660 if (ret == -2) {
661 fprintf(stderr,
662 "plink: option \"%s\" requires an argument\n", p);
663 errors = 1;
664 } else if (ret == 2) {
665 --argc, ++argv;
666 } else if (ret == 1) {
667 continue;
668 } else if (!strcmp(p, "-batch")) {
669 console_batch_mode = 1;
670 } else if (!strcmp(p, "-s")) {
671 /* Save status to write to conf later. */
672 use_subsystem = 1;
673 } else if (!strcmp(p, "-V") || !strcmp(p, "--version")) {
674 version();
675 } else if (!strcmp(p, "--help")) {
676 usage();
677 exit(0);
678 } else if (!strcmp(p, "-pgpfp")) {
679 pgp_fingerprints();
680 exit(1);
681 } else if (!strcmp(p, "-o")) {
682 if (argc <= 1) {
683 fprintf(stderr,
684 "plink: option \"-o\" requires an argument\n");
685 errors = 1;
686 } else {
687 --argc;
688 provide_xrm_string(*++argv);
689 }
690 } else {
691 fprintf(stderr, "plink: unknown option \"%s\"\n", p);
692 errors = 1;
693 }
694 } else if (*p) {
695 if (!conf_launchable(conf) || !(got_host || loaded_session)) {
696 char *q = p;
697
698 /*
699 * If the hostname starts with "telnet:", set the
700 * protocol to Telnet and process the string as a
701 * Telnet URL.
702 */
703 if (!strncmp(q, "telnet:", 7)) {
704 char c;
705
706 q += 7;
707 if (q[0] == '/' && q[1] == '/')
708 q += 2;
709 conf_set_int(conf, CONF_protocol, PROT_TELNET);
710 p = q;
711 while (*p && *p != ':' && *p != '/')
712 p++;
713 c = *p;
714 if (*p)
715 *p++ = '\0';
716 if (c == ':')
717 conf_set_int(conf, CONF_port, atoi(p));
718 else
719 conf_set_int(conf, CONF_port, -1);
720 conf_set_str(conf, CONF_host, q);
721 got_host = TRUE;
722 } else {
723 char *r, *user, *host;
724 /*
725 * Before we process the [user@]host string, we
726 * first check for the presence of a protocol
727 * prefix (a protocol name followed by ",").
728 */
729 r = strchr(p, ',');
730 if (r) {
731 const Backend *b;
732 *r = '\0';
733 b = backend_from_name(p);
734 if (b) {
735 default_protocol = b->protocol;
736 conf_set_int(conf, CONF_protocol,
737 default_protocol);
738 portnumber = b->default_port;
739 }
740 p = r + 1;
741 }
742
743 /*
744 * A nonzero length string followed by an @ is treated
745 * as a username. (We discount an _initial_ @.) The
746 * rest of the string (or the whole string if no @)
747 * is treated as a session name and/or hostname.
748 */
749 r = strrchr(p, '@');
750 if (r == p)
751 p++, r = NULL; /* discount initial @ */
752 if (r) {
753 *r++ = '\0';
754 user = p, host = r;
755 } else {
756 user = NULL, host = p;
757 }
758
759 /*
760 * Now attempt to load a saved session with the
761 * same name as the hostname.
762 */
763 {
764 Conf *conf2 = conf_new();
765 do_defaults(host, conf2);
766 if (loaded_session || !conf_launchable(conf2)) {
767 /* No settings for this host; use defaults */
768 /* (or session was already loaded with -load) */
769 conf_set_str(conf, CONF_host, host);
770 conf_set_int(conf, CONF_port, default_port);
771 got_host = TRUE;
772 } else {
773 conf_copy_into(conf, conf2);
774 loaded_session = TRUE;
775 }
776 conf_free(conf2);
777 }
778
779 if (user) {
780 /* Patch in specified username. */
781 conf_set_str(conf, CONF_username, user);
782 }
783
784 }
785 } else {
786 char *command;
787 int cmdlen, cmdsize;
788 cmdlen = cmdsize = 0;
789 command = NULL;
790
791 while (argc) {
792 while (*p) {
793 if (cmdlen >= cmdsize) {
794 cmdsize = cmdlen + 512;
795 command = sresize(command, cmdsize, char);
796 }
797 command[cmdlen++]=*p++;
798 }
799 if (cmdlen >= cmdsize) {
800 cmdsize = cmdlen + 512;
801 command = sresize(command, cmdsize, char);
802 }
803 command[cmdlen++]=' '; /* always add trailing space */
804 if (--argc) p = *++argv;
805 }
806 if (cmdlen) command[--cmdlen]='\0';
807 /* change trailing blank to NUL */
808 conf_set_str(conf, CONF_remote_cmd, command);
809 conf_set_str(conf, CONF_remote_cmd2, "");
810 conf_set_int(conf, CONF_nopty, TRUE); /* command => no tty */
811
812 break; /* done with cmdline */
813 }
814 }
815 }
816
817 if (errors)
818 return 1;
819
820 if (!conf_launchable(conf) || !(got_host || loaded_session)) {
821 usage();
822 }
823
824 /*
825 * Muck about with the hostname in various ways.
826 */
827 {
828 char *hostbuf = dupstr(conf_get_str(conf, CONF_host));
829 char *host = hostbuf;
830 char *p, *q;
831
832 /*
833 * Trim leading whitespace.
834 */
835 host += strspn(host, " \t");
836
837 /*
838 * See if host is of the form user@host, and separate out
839 * the username if so.
840 */
841 if (host[0] != '\0') {
842 char *atsign = strrchr(host, '@');
843 if (atsign) {
844 *atsign = '\0';
845 conf_set_str(conf, CONF_username, host);
846 host = atsign + 1;
847 }
848 }
849
850 /*
851 * Trim off a colon suffix if it's there.
852 */
853 host[strcspn(host, ":")] = '\0';
854
855 /*
856 * Remove any remaining whitespace.
857 */
858 p = hostbuf;
859 q = host;
860 while (*q) {
861 if (*q != ' ' && *q != '\t')
862 *p++ = *q;
863 q++;
864 }
865 *p = '\0';
866
867 conf_set_str(conf, CONF_host, hostbuf);
868 sfree(hostbuf);
869 }
870
871 /*
872 * Perform command-line overrides on session configuration.
873 */
874 cmdline_run_saved(conf);
875
876 /*
877 * Apply subsystem status.
878 */
879 if (use_subsystem)
880 conf_set_int(conf, CONF_ssh_subsys, TRUE);
881
882 if (!*conf_get_str(conf, CONF_remote_cmd) &&
883 !*conf_get_str(conf, CONF_remote_cmd2) &&
884 !*conf_get_str(conf, CONF_ssh_nc_host))
885 flags |= FLAG_INTERACTIVE;
886
887 /*
888 * Select protocol. This is farmed out into a table in a
889 * separate file to enable an ssh-free variant.
890 */
891 back = backend_from_proto(conf_get_int(conf, CONF_protocol));
892 if (back == NULL) {
893 fprintf(stderr,
894 "Internal fault: Unsupported protocol found\n");
895 return 1;
896 }
897
898 /*
899 * Select port.
900 */
901 if (portnumber != -1)
902 conf_set_int(conf, CONF_port, portnumber);
903
904 /*
905 * Block SIGPIPE, so that we'll get EPIPE individually on
906 * particular network connections that go wrong.
907 */
908 putty_signal(SIGPIPE, SIG_IGN);
909
910 /*
911 * Set up the pipe we'll use to tell us about SIGWINCH.
912 */
913 if (pipe(signalpipe) < 0) {
914 perror("pipe");
915 exit(1);
916 }
917 putty_signal(SIGWINCH, sigwinch);
918
919 /*
920 * Now that we've got the SIGWINCH handler installed, try to find
921 * out the initial terminal size.
922 */
923 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &size) >= 0) {
924 conf_set_int(conf, CONF_width, size.ws_col);
925 conf_set_int(conf, CONF_height, size.ws_row);
926 }
927
928 sk_init();
929 uxsel_init();
930
931 /*
932 * Unix Plink doesn't provide any way to add forwardings after the
933 * connection is set up, so if there are none now, we can safely set
934 * the "simple" flag.
935 */
936 if (conf_get_int(conf, CONF_protocol) == PROT_SSH &&
937 !conf_get_int(conf, CONF_x11_forward) &&
938 !conf_get_int(conf, CONF_agentfwd) &&
939 !conf_get_str_nthstrkey(conf, CONF_portfwd, 0))
940 conf_set_int(conf, CONF_ssh_simple, TRUE);
941
942 /*
943 * Start up the connection.
944 */
945 logctx = log_init(NULL, conf);
946 console_provide_logctx(logctx);
947 {
948 const char *error;
949 char *realhost;
950 /* nodelay is only useful if stdin is a terminal device */
951 int nodelay = conf_get_int(conf, CONF_tcp_nodelay) && isatty(0);
952
953 error = back->init(NULL, &backhandle, conf,
954 conf_get_str(conf, CONF_host),
955 conf_get_int(conf, CONF_port),
956 &realhost, nodelay,
957 conf_get_int(conf, CONF_tcp_keepalives));
958 if (error) {
959 fprintf(stderr, "Unable to open connection:\n%s\n", error);
960 return 1;
961 }
962 back->provide_logctx(backhandle, logctx);
963 ldisc_create(conf, NULL, back, backhandle, NULL);
964 sfree(realhost);
965 }
966 connopen = 1;
967
968 /*
969 * Set up the initial console mode. We don't care if this call
970 * fails, because we know we aren't necessarily running in a
971 * console.
972 */
973 local_tty = (tcgetattr(STDIN_FILENO, &orig_termios) == 0);
974 atexit(cleanup_termios);
975 ldisc_update(NULL, 1, 1);
976 sending = FALSE;
977 now = GETTICKCOUNT();
978
979 while (1) {
980 fd_set rset, wset, xset;
981 int maxfd;
982 int rwx;
983 int ret;
984
985 FD_ZERO(&rset);
986 FD_ZERO(&wset);
987 FD_ZERO(&xset);
988 maxfd = 0;
989
990 FD_SET_MAX(signalpipe[0], maxfd, rset);
991
992 if (connopen && !sending &&
993 back->connected(backhandle) &&
994 back->sendok(backhandle) &&
995 back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
996 /* If we're OK to send, then try to read from stdin. */
997 FD_SET_MAX(STDIN_FILENO, maxfd, rset);
998 }
999
1000 if (bufchain_size(&stdout_data) > 0) {
1001 /* If we have data for stdout, try to write to stdout. */
1002 FD_SET_MAX(STDOUT_FILENO, maxfd, wset);
1003 }
1004
1005 if (bufchain_size(&stderr_data) > 0) {
1006 /* If we have data for stderr, try to write to stderr. */
1007 FD_SET_MAX(STDERR_FILENO, maxfd, wset);
1008 }
1009
1010 /* Count the currently active fds. */
1011 i = 0;
1012 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
1013 fd = next_fd(&fdstate, &rwx)) i++;
1014
1015 /* Expand the fdlist buffer if necessary. */
1016 if (i > fdsize) {
1017 fdsize = i + 16;
1018 fdlist = sresize(fdlist, fdsize, int);
1019 }
1020
1021 /*
1022 * Add all currently open fds to the select sets, and store
1023 * them in fdlist as well.
1024 */
1025 fdcount = 0;
1026 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
1027 fd = next_fd(&fdstate, &rwx)) {
1028 fdlist[fdcount++] = fd;
1029 if (rwx & 1)
1030 FD_SET_MAX(fd, maxfd, rset);
1031 if (rwx & 2)
1032 FD_SET_MAX(fd, maxfd, wset);
1033 if (rwx & 4)
1034 FD_SET_MAX(fd, maxfd, xset);
1035 }
1036
1037 do {
1038 unsigned long next, then;
1039 long ticks;
1040 struct timeval tv, *ptv;
1041
1042 if (run_timers(now, &next)) {
1043 then = now;
1044 now = GETTICKCOUNT();
1045 if (now - then > next - then)
1046 ticks = 0;
1047 else
1048 ticks = next - now;
1049 tv.tv_sec = ticks / 1000;
1050 tv.tv_usec = ticks % 1000 * 1000;
1051 ptv = &tv;
1052 } else {
1053 ptv = NULL;
1054 }
1055 ret = select(maxfd, &rset, &wset, &xset, ptv);
1056 if (ret == 0)
1057 now = next;
1058 else
1059 now = GETTICKCOUNT();
1060 } while (ret < 0 && errno == EINTR);
1061
1062 if (ret < 0) {
1063 perror("select");
1064 exit(1);
1065 }
1066
1067 for (i = 0; i < fdcount; i++) {
1068 fd = fdlist[i];
1069 /*
1070 * We must process exceptional notifications before
1071 * ordinary readability ones, or we may go straight
1072 * past the urgent marker.
1073 */
1074 if (FD_ISSET(fd, &xset))
1075 select_result(fd, 4);
1076 if (FD_ISSET(fd, &rset))
1077 select_result(fd, 1);
1078 if (FD_ISSET(fd, &wset))
1079 select_result(fd, 2);
1080 }
1081
1082 if (FD_ISSET(signalpipe[0], &rset)) {
1083 char c[1];
1084 struct winsize size;
1085 if (read(signalpipe[0], c, 1) <= 0)
1086 /* ignore error */;
1087 /* ignore its value; it'll be `x' */
1088 if (ioctl(STDIN_FILENO, TIOCGWINSZ, (void *)&size) >= 0)
1089 back->size(backhandle, size.ws_col, size.ws_row);
1090 }
1091
1092 if (FD_ISSET(STDIN_FILENO, &rset)) {
1093 char buf[4096];
1094 int ret;
1095
1096 if (connopen && back->connected(backhandle)) {
1097 ret = read(STDIN_FILENO, buf, sizeof(buf));
1098 if (ret < 0) {
1099 perror("stdin: read");
1100 exit(1);
1101 } else if (ret == 0) {
1102 back->special(backhandle, TS_EOF);
1103 sending = FALSE; /* send nothing further after this */
1104 } else {
1105 if (local_tty)
1106 from_tty(buf, ret);
1107 else
1108 back->send(backhandle, buf, ret);
1109 }
1110 }
1111 }
1112
1113 if (FD_ISSET(STDOUT_FILENO, &wset)) {
1114 back->unthrottle(backhandle, try_output(FALSE));
1115 }
1116
1117 if (FD_ISSET(STDERR_FILENO, &wset)) {
1118 back->unthrottle(backhandle, try_output(TRUE));
1119 }
1120
1121 net_pending_errors();
1122
1123 if ((!connopen || !back->connected(backhandle)) &&
1124 bufchain_size(&stdout_data) == 0 &&
1125 bufchain_size(&stderr_data) == 0)
1126 break; /* we closed the connection */
1127 }
1128 exitcode = back->exitcode(backhandle);
1129 if (exitcode < 0) {
1130 fprintf(stderr, "Remote process exit code unavailable\n");
1131 exitcode = 1; /* this is an error condition */
1132 }
1133 cleanup_exit(exitcode);
1134 return exitcode; /* shouldn't happen, but placates gcc */
1135 }
Local modifications for Simon Tatham's `PuTTY' SSH client and terminal emulator