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Rationalise access to, and content of, backends[] array.
[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 void fatalbox(char *p, ...)
31 {
32 va_list ap;
33 fprintf(stderr, "FATAL ERROR: ");
34 va_start(ap, p);
35 vfprintf(stderr, p, ap);
36 va_end(ap);
37 fputc('\n', stderr);
38 if (logctx) {
39 log_free(logctx);
40 logctx = NULL;
41 }
42 cleanup_exit(1);
43 }
44 void modalfatalbox(char *p, ...)
45 {
46 va_list ap;
47 fprintf(stderr, "FATAL ERROR: ");
48 va_start(ap, p);
49 vfprintf(stderr, p, ap);
50 va_end(ap);
51 fputc('\n', stderr);
52 if (logctx) {
53 log_free(logctx);
54 logctx = NULL;
55 }
56 cleanup_exit(1);
57 }
58 void connection_fatal(void *frontend, char *p, ...)
59 {
60 va_list ap;
61 fprintf(stderr, "FATAL ERROR: ");
62 va_start(ap, p);
63 vfprintf(stderr, p, ap);
64 va_end(ap);
65 fputc('\n', stderr);
66 if (logctx) {
67 log_free(logctx);
68 logctx = NULL;
69 }
70 cleanup_exit(1);
71 }
72 void cmdline_error(char *p, ...)
73 {
74 va_list ap;
75 fprintf(stderr, "plink: ");
76 va_start(ap, p);
77 vfprintf(stderr, p, ap);
78 va_end(ap);
79 fputc('\n', stderr);
80 exit(1);
81 }
82
83 static int local_tty = 0; /* do we have a local tty? */
84 static struct termios orig_termios;
85
86 static Backend *back;
87 static void *backhandle;
88 static Config cfg;
89
90 /*
91 * Default settings that are specific to pterm.
92 */
93 char *platform_default_s(const char *name)
94 {
95 if (!strcmp(name, "TermType"))
96 return dupstr(getenv("TERM"));
97 if (!strcmp(name, "UserName"))
98 return get_username();
99 if (!strcmp(name, "SerialLine"))
100 return dupstr("/dev/ttyS0");
101 return NULL;
102 }
103
104 int platform_default_i(const char *name, int def)
105 {
106 if (!strcmp(name, "TermWidth") ||
107 !strcmp(name, "TermHeight")) {
108 struct winsize size;
109 if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
110 return (!strcmp(name, "TermWidth") ? size.ws_col : size.ws_row);
111 }
112 return def;
113 }
114
115 FontSpec platform_default_fontspec(const char *name)
116 {
117 FontSpec ret;
118 *ret.name = '\0';
119 return ret;
120 }
121
122 Filename platform_default_filename(const char *name)
123 {
124 Filename ret;
125 if (!strcmp(name, "LogFileName"))
126 strcpy(ret.path, "putty.log");
127 else
128 *ret.path = '\0';
129 return ret;
130 }
131
132 char *x_get_default(const char *key)
133 {
134 return NULL; /* this is a stub */
135 }
136 int term_ldisc(Terminal *term, int mode)
137 {
138 return FALSE;
139 }
140 void ldisc_update(void *frontend, int echo, int edit)
141 {
142 /* Update stdin read mode to reflect changes in line discipline. */
143 struct termios mode;
144
145 if (!local_tty) return;
146
147 mode = orig_termios;
148
149 if (echo)
150 mode.c_lflag |= ECHO;
151 else
152 mode.c_lflag &= ~ECHO;
153
154 if (edit) {
155 mode.c_iflag |= ICRNL;
156 mode.c_lflag |= ISIG | ICANON;
157 mode.c_oflag |= OPOST;
158 } else {
159 mode.c_iflag &= ~ICRNL;
160 mode.c_lflag &= ~(ISIG | ICANON);
161 mode.c_oflag &= ~OPOST;
162 /* Solaris sets these to unhelpful values */
163 mode.c_cc[VMIN] = 1;
164 mode.c_cc[VTIME] = 0;
165 /* FIXME: perhaps what we do with IXON/IXOFF should be an
166 * argument to ldisc_update(), to allow implementation of SSH-2
167 * "xon-xoff" and Rlogin's equivalent? */
168 mode.c_iflag &= ~IXON;
169 mode.c_iflag &= ~IXOFF;
170 }
171 /*
172 * Mark parity errors and (more important) BREAK on input. This
173 * is more complex than it need be because POSIX-2001 suggests
174 * that escaping of valid 0xff in the input stream is dependent on
175 * IGNPAR being clear even though marking of BREAK isn't. NetBSD
176 * 2.0 goes one worse and makes it dependent on INPCK too. We
177 * deal with this by forcing these flags into a useful state and
178 * then faking the state in which we found them in from_tty() if
179 * we get passed a parity or framing error.
180 */
181 mode.c_iflag = (mode.c_iflag | INPCK | PARMRK) & ~IGNPAR;
182
183 tcsetattr(0, TCSANOW, &mode);
184 }
185
186 /* Helper function to extract a special character from a termios. */
187 static char *get_ttychar(struct termios *t, int index)
188 {
189 cc_t c = t->c_cc[index];
190 #if defined(_POSIX_VDISABLE)
191 if (c == _POSIX_VDISABLE)
192 return dupprintf("");
193 #endif
194 return dupprintf("^<%d>", c);
195 }
196
197 char *get_ttymode(void *frontend, const char *mode)
198 {
199 /*
200 * Propagate appropriate terminal modes from the local terminal,
201 * if any.
202 */
203 if (!local_tty) return NULL;
204
205 #define GET_CHAR(ourname, uxname) \
206 do { \
207 if (strcmp(mode, ourname) == 0) \
208 return get_ttychar(&orig_termios, uxname); \
209 } while(0)
210 #define GET_BOOL(ourname, uxname, uxmemb, transform) \
211 do { \
212 if (strcmp(mode, ourname) == 0) { \
213 int b = (orig_termios.uxmemb & uxname) != 0; \
214 transform; \
215 return dupprintf("%d", b); \
216 } \
217 } while (0)
218
219 /*
220 * Modes that want to be the same on all terminal devices involved.
221 */
222 /* All the special characters supported by SSH */
223 #if defined(VINTR)
224 GET_CHAR("INTR", VINTR);
225 #endif
226 #if defined(VQUIT)
227 GET_CHAR("QUIT", VQUIT);
228 #endif
229 #if defined(VERASE)
230 GET_CHAR("ERASE", VERASE);
231 #endif
232 #if defined(VKILL)
233 GET_CHAR("KILL", VKILL);
234 #endif
235 #if defined(VEOF)
236 GET_CHAR("EOF", VEOF);
237 #endif
238 #if defined(VEOL)
239 GET_CHAR("EOL", VEOL);
240 #endif
241 #if defined(VEOL2)
242 GET_CHAR("EOL2", VEOL2);
243 #endif
244 #if defined(VSTART)
245 GET_CHAR("START", VSTART);
246 #endif
247 #if defined(VSTOP)
248 GET_CHAR("STOP", VSTOP);
249 #endif
250 #if defined(VSUSP)
251 GET_CHAR("SUSP", VSUSP);
252 #endif
253 #if defined(VDSUSP)
254 GET_CHAR("DSUSP", VDSUSP);
255 #endif
256 #if defined(VREPRINT)
257 GET_CHAR("REPRINT", VREPRINT);
258 #endif
259 #if defined(VWERASE)
260 GET_CHAR("WERASE", VWERASE);
261 #endif
262 #if defined(VLNEXT)
263 GET_CHAR("LNEXT", VLNEXT);
264 #endif
265 #if defined(VFLUSH)
266 GET_CHAR("FLUSH", VFLUSH);
267 #endif
268 #if defined(VSWTCH)
269 GET_CHAR("SWTCH", VSWTCH);
270 #endif
271 #if defined(VSTATUS)
272 GET_CHAR("STATUS", VSTATUS);
273 #endif
274 #if defined(VDISCARD)
275 GET_CHAR("DISCARD", VDISCARD);
276 #endif
277 /* Modes that "configure" other major modes. These should probably be
278 * considered as user preferences. */
279 /* Configuration of ICANON */
280 #if defined(ECHOK)
281 GET_BOOL("ECHOK", ECHOK, c_lflag, );
282 #endif
283 #if defined(ECHOKE)
284 GET_BOOL("ECHOKE", ECHOKE, c_lflag, );
285 #endif
286 #if defined(ECHOE)
287 GET_BOOL("ECHOE", ECHOE, c_lflag, );
288 #endif
289 #if defined(ECHONL)
290 GET_BOOL("ECHONL", ECHONL, c_lflag, );
291 #endif
292 #if defined(XCASE)
293 GET_BOOL("XCASE", XCASE, c_lflag, );
294 #endif
295 /* Configuration of ECHO */
296 #if defined(ECHOCTL)
297 GET_BOOL("ECHOCTL", ECHOCTL, c_lflag, );
298 #endif
299 /* Configuration of IXON/IXOFF */
300 #if defined(IXANY)
301 GET_BOOL("IXANY", IXANY, c_iflag, );
302 #endif
303 /* Configuration of OPOST */
304 #if defined(OLCUC)
305 GET_BOOL("OLCUC", OLCUC, c_oflag, );
306 #endif
307 #if defined(ONLCR)
308 GET_BOOL("ONLCR", ONLCR, c_oflag, );
309 #endif
310 #if defined(OCRNL)
311 GET_BOOL("OCRNL", OCRNL, c_oflag, );
312 #endif
313 #if defined(ONOCR)
314 GET_BOOL("ONOCR", ONOCR, c_oflag, );
315 #endif
316 #if defined(ONLRET)
317 GET_BOOL("ONLRET", ONLRET, c_oflag, );
318 #endif
319
320 /*
321 * Modes that want to be set in only one place, and that we have
322 * squashed locally.
323 */
324 #if defined(ISIG)
325 GET_BOOL("ISIG", ISIG, c_lflag, );
326 #endif
327 #if defined(ICANON)
328 GET_BOOL("ICANON", ICANON, c_lflag, );
329 #endif
330 #if defined(ECHO)
331 GET_BOOL("ECHO", ECHO, c_lflag, );
332 #endif
333 #if defined(IXON)
334 GET_BOOL("IXON", IXON, c_iflag, );
335 #endif
336 #if defined(IXOFF)
337 GET_BOOL("IXOFF", IXOFF, c_iflag, );
338 #endif
339 #if defined(OPOST)
340 GET_BOOL("OPOST", OPOST, c_oflag, );
341 #endif
342
343 /*
344 * We do not propagate the following modes:
345 * - Parity/serial settings, which are a local affair and don't
346 * make sense propagated over SSH's 8-bit byte-stream.
347 * IGNPAR PARMRK INPCK CS7 CS8 PARENB PARODD
348 * - Things that want to be enabled in one place that we don't
349 * squash locally.
350 * IUCLC
351 * - Status bits.
352 * PENDIN
353 * - Things I don't know what to do with. (FIXME)
354 * ISTRIP IMAXBEL NOFLSH TOSTOP IEXTEN
355 * INLCR IGNCR ICRNL
356 */
357
358 #undef GET_CHAR
359 #undef GET_BOOL
360
361 /* Fall through to here for unrecognised names, or ones that are
362 * unsupported on this platform */
363 return NULL;
364 }
365
366 void cleanup_termios(void)
367 {
368 if (local_tty)
369 tcsetattr(0, TCSANOW, &orig_termios);
370 }
371
372 bufchain stdout_data, stderr_data;
373
374 void try_output(int is_stderr)
375 {
376 bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
377 int fd = (is_stderr ? 2 : 1);
378 void *senddata;
379 int sendlen, ret;
380
381 if (bufchain_size(chain) == 0)
382 return;
383
384 bufchain_prefix(chain, &senddata, &sendlen);
385 ret = write(fd, senddata, sendlen);
386 if (ret > 0)
387 bufchain_consume(chain, ret);
388 else if (ret < 0) {
389 perror(is_stderr ? "stderr: write" : "stdout: write");
390 exit(1);
391 }
392 }
393
394 int from_backend(void *frontend_handle, int is_stderr,
395 const char *data, int len)
396 {
397 int osize, esize;
398
399 if (is_stderr) {
400 bufchain_add(&stderr_data, data, len);
401 try_output(1);
402 } else {
403 bufchain_add(&stdout_data, data, len);
404 try_output(0);
405 }
406
407 osize = bufchain_size(&stdout_data);
408 esize = bufchain_size(&stderr_data);
409
410 return osize + esize;
411 }
412
413 int from_backend_untrusted(void *frontend_handle, const char *data, int len)
414 {
415 /*
416 * No "untrusted" output should get here (the way the code is
417 * currently, it's all diverted by FLAG_STDERR).
418 */
419 assert(!"Unexpected call to from_backend_untrusted()");
420 return 0; /* not reached */
421 }
422
423 int get_userpass_input(prompts_t *p, unsigned char *in, int inlen)
424 {
425 int ret;
426 ret = cmdline_get_passwd_input(p, in, inlen);
427 if (ret == -1)
428 ret = console_get_userpass_input(p, in, inlen);
429 return ret;
430 }
431
432 /*
433 * Handle data from a local tty in PARMRK format.
434 */
435 static void from_tty(void *vbuf, unsigned len)
436 {
437 char *p, *q, *end, *buf = vbuf;
438 static enum {NORMAL, FF, FF00} state = NORMAL;
439
440 p = buf; end = buf + len;
441 while (p < end) {
442 switch (state) {
443 case NORMAL:
444 if (*p == '\xff') {
445 p++;
446 state = FF;
447 } else {
448 q = memchr(p, '\xff', end - p);
449 if (q == NULL) q = end;
450 back->send(backhandle, p, q - p);
451 p = q;
452 }
453 break;
454 case FF:
455 if (*p == '\xff') {
456 back->send(backhandle, p, 1);
457 p++;
458 state = NORMAL;
459 } else if (*p == '\0') {
460 p++;
461 state = FF00;
462 } else abort();
463 break;
464 case FF00:
465 if (*p == '\0') {
466 back->special(backhandle, TS_BRK);
467 } else {
468 /*
469 * Pretend that PARMRK wasn't set. This involves
470 * faking what INPCK and IGNPAR would have done if
471 * we hadn't overridden them. Unfortunately, we
472 * can't do this entirely correctly because INPCK
473 * distinguishes between framing and parity
474 * errors, but PARMRK format represents both in
475 * the same way. We assume that parity errors are
476 * more common than framing errors, and hence
477 * treat all input errors as being subject to
478 * INPCK.
479 */
480 if (orig_termios.c_iflag & INPCK) {
481 /* If IGNPAR is set, we throw away the character. */
482 if (!(orig_termios.c_iflag & IGNPAR)) {
483 /* PE/FE get passed on as NUL. */
484 *p = 0;
485 back->send(backhandle, p, 1);
486 }
487 } else {
488 /* INPCK not set. Assume we got a parity error. */
489 back->send(backhandle, p, 1);
490 }
491 }
492 p++;
493 state = NORMAL;
494 }
495 }
496 }
497
498 int signalpipe[2];
499
500 void sigwinch(int signum)
501 {
502 write(signalpipe[1], "x", 1);
503 }
504
505 /*
506 * In Plink our selects are synchronous, so these functions are
507 * empty stubs.
508 */
509 int uxsel_input_add(int fd, int rwx) { return 0; }
510 void uxsel_input_remove(int id) { }
511
512 /*
513 * Short description of parameters.
514 */
515 static void usage(void)
516 {
517 printf("PuTTY Link: command-line connection utility\n");
518 printf("%s\n", ver);
519 printf("Usage: plink [options] [user@]host [command]\n");
520 printf(" (\"host\" can also be a PuTTY saved session name)\n");
521 printf("Options:\n");
522 printf(" -V print version information and exit\n");
523 printf(" -pgpfp print PGP key fingerprints and exit\n");
524 printf(" -v show verbose messages\n");
525 printf(" -load sessname Load settings from saved session\n");
526 printf(" -ssh -telnet -rlogin -raw\n");
527 printf(" force use of a particular protocol\n");
528 printf(" -P port connect to specified port\n");
529 printf(" -l user connect with specified username\n");
530 printf(" -batch disable all interactive prompts\n");
531 printf("The following options only apply to SSH connections:\n");
532 printf(" -pw passw login with specified password\n");
533 printf(" -D [listen-IP:]listen-port\n");
534 printf(" Dynamic SOCKS-based port forwarding\n");
535 printf(" -L [listen-IP:]listen-port:host:port\n");
536 printf(" Forward local port to remote address\n");
537 printf(" -R [listen-IP:]listen-port:host:port\n");
538 printf(" Forward remote port to local address\n");
539 printf(" -X -x enable / disable X11 forwarding\n");
540 printf(" -A -a enable / disable agent forwarding\n");
541 printf(" -t -T enable / disable pty allocation\n");
542 printf(" -1 -2 force use of particular protocol version\n");
543 printf(" -4 -6 force use of IPv4 or IPv6\n");
544 printf(" -C enable compression\n");
545 printf(" -i key private key file for authentication\n");
546 printf(" -noagent disable use of Pageant\n");
547 printf(" -agent enable use of Pageant\n");
548 printf(" -m file read remote command(s) from file\n");
549 printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
550 printf(" -N don't start a shell/command (SSH-2 only)\n");
551 printf(" -nc host:port\n");
552 printf(" open tunnel in place of session (SSH-2 only)\n");
553 exit(1);
554 }
555
556 static void version(void)
557 {
558 printf("plink: %s\n", ver);
559 exit(1);
560 }
561
562 int main(int argc, char **argv)
563 {
564 int sending;
565 int portnumber = -1;
566 int *fdlist;
567 int fd;
568 int i, fdcount, fdsize, fdstate;
569 int connopen;
570 int exitcode;
571 int errors;
572 int use_subsystem = 0;
573 void *ldisc;
574 long now;
575
576 fdlist = NULL;
577 fdcount = fdsize = 0;
578 /*
579 * Initialise port and protocol to sensible defaults. (These
580 * will be overridden by more or less anything.)
581 */
582 default_protocol = PROT_SSH;
583 default_port = 22;
584
585 flags = FLAG_STDERR;
586 /*
587 * Process the command line.
588 */
589 do_defaults(NULL, &cfg);
590 loaded_session = FALSE;
591 default_protocol = cfg.protocol;
592 default_port = cfg.port;
593 errors = 0;
594 {
595 /*
596 * Override the default protocol if PLINK_PROTOCOL is set.
597 */
598 char *p = getenv("PLINK_PROTOCOL");
599 if (p) {
600 const Backend *b = backend_from_name(p);
601 if (b) {
602 default_protocol = cfg.protocol = b->protocol;
603 default_port = cfg.port = b->default_port;
604 }
605 }
606 }
607 while (--argc) {
608 char *p = *++argv;
609 if (*p == '-') {
610 int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
611 1, &cfg);
612 if (ret == -2) {
613 fprintf(stderr,
614 "plink: option \"%s\" requires an argument\n", p);
615 errors = 1;
616 } else if (ret == 2) {
617 --argc, ++argv;
618 } else if (ret == 1) {
619 continue;
620 } else if (!strcmp(p, "-batch")) {
621 console_batch_mode = 1;
622 } else if (!strcmp(p, "-s")) {
623 /* Save status to write to cfg later. */
624 use_subsystem = 1;
625 } else if (!strcmp(p, "-V")) {
626 version();
627 } else if (!strcmp(p, "-pgpfp")) {
628 pgp_fingerprints();
629 exit(1);
630 } else if (!strcmp(p, "-o")) {
631 if (argc <= 1) {
632 fprintf(stderr,
633 "plink: option \"-o\" requires an argument\n");
634 errors = 1;
635 } else {
636 --argc;
637 provide_xrm_string(*++argv);
638 }
639 } else {
640 fprintf(stderr, "plink: unknown option \"%s\"\n", p);
641 errors = 1;
642 }
643 } else if (*p) {
644 if (!cfg_launchable(&cfg)) {
645 char *q = p;
646
647 /*
648 * If the hostname starts with "telnet:", set the
649 * protocol to Telnet and process the string as a
650 * Telnet URL.
651 */
652 if (!strncmp(q, "telnet:", 7)) {
653 char c;
654
655 q += 7;
656 if (q[0] == '/' && q[1] == '/')
657 q += 2;
658 cfg.protocol = PROT_TELNET;
659 p = q;
660 while (*p && *p != ':' && *p != '/')
661 p++;
662 c = *p;
663 if (*p)
664 *p++ = '\0';
665 if (c == ':')
666 cfg.port = atoi(p);
667 else
668 cfg.port = -1;
669 strncpy(cfg.host, q, sizeof(cfg.host) - 1);
670 cfg.host[sizeof(cfg.host) - 1] = '\0';
671 } else {
672 char *r, *user, *host;
673 /*
674 * Before we process the [user@]host string, we
675 * first check for the presence of a protocol
676 * prefix (a protocol name followed by ",").
677 */
678 r = strchr(p, ',');
679 if (r) {
680 const Backend *b;
681 *r = '\0';
682 b = backend_from_name(p);
683 if (b) {
684 default_protocol = cfg.protocol = b->protocol;
685 portnumber = b->default_port;
686 }
687 p = r + 1;
688 }
689
690 /*
691 * A nonzero length string followed by an @ is treated
692 * as a username. (We discount an _initial_ @.) The
693 * rest of the string (or the whole string if no @)
694 * is treated as a session name and/or hostname.
695 */
696 r = strrchr(p, '@');
697 if (r == p)
698 p++, r = NULL; /* discount initial @ */
699 if (r) {
700 *r++ = '\0';
701 user = p, host = r;
702 } else {
703 user = NULL, host = p;
704 }
705
706 /*
707 * Now attempt to load a saved session with the
708 * same name as the hostname.
709 */
710 {
711 Config cfg2;
712 do_defaults(host, &cfg2);
713 if (loaded_session || !cfg_launchable(&cfg2)) {
714 /* No settings for this host; use defaults */
715 /* (or session was already loaded with -load) */
716 strncpy(cfg.host, host, sizeof(cfg.host) - 1);
717 cfg.host[sizeof(cfg.host) - 1] = '\0';
718 cfg.port = default_port;
719 } else {
720 cfg = cfg2;
721 }
722 }
723
724 if (user) {
725 /* Patch in specified username. */
726 strncpy(cfg.username, user,
727 sizeof(cfg.username) - 1);
728 cfg.username[sizeof(cfg.username) - 1] = '\0';
729 }
730
731 }
732 } else {
733 char *command;
734 int cmdlen, cmdsize;
735 cmdlen = cmdsize = 0;
736 command = NULL;
737
738 while (argc) {
739 while (*p) {
740 if (cmdlen >= cmdsize) {
741 cmdsize = cmdlen + 512;
742 command = sresize(command, cmdsize, char);
743 }
744 command[cmdlen++]=*p++;
745 }
746 if (cmdlen >= cmdsize) {
747 cmdsize = cmdlen + 512;
748 command = sresize(command, cmdsize, char);
749 }
750 command[cmdlen++]=' '; /* always add trailing space */
751 if (--argc) p = *++argv;
752 }
753 if (cmdlen) command[--cmdlen]='\0';
754 /* change trailing blank to NUL */
755 cfg.remote_cmd_ptr = command;
756 cfg.remote_cmd_ptr2 = NULL;
757 cfg.nopty = TRUE; /* command => no terminal */
758
759 break; /* done with cmdline */
760 }
761 }
762 }
763
764 if (errors)
765 return 1;
766
767 if (!cfg_launchable(&cfg)) {
768 usage();
769 }
770
771 /*
772 * Trim leading whitespace off the hostname if it's there.
773 */
774 {
775 int space = strspn(cfg.host, " \t");
776 memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
777 }
778
779 /* See if host is of the form user@host */
780 if (cfg.host[0] != '\0') {
781 char *atsign = strrchr(cfg.host, '@');
782 /* Make sure we're not overflowing the user field */
783 if (atsign) {
784 if (atsign - cfg.host < sizeof cfg.username) {
785 strncpy(cfg.username, cfg.host, atsign - cfg.host);
786 cfg.username[atsign - cfg.host] = '\0';
787 }
788 memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
789 }
790 }
791
792 /*
793 * Perform command-line overrides on session configuration.
794 */
795 cmdline_run_saved(&cfg);
796
797 /*
798 * Apply subsystem status.
799 */
800 if (use_subsystem)
801 cfg.ssh_subsys = TRUE;
802
803 /*
804 * Trim a colon suffix off the hostname if it's there.
805 */
806 cfg.host[strcspn(cfg.host, ":")] = '\0';
807
808 /*
809 * Remove any remaining whitespace from the hostname.
810 */
811 {
812 int p1 = 0, p2 = 0;
813 while (cfg.host[p2] != '\0') {
814 if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
815 cfg.host[p1] = cfg.host[p2];
816 p1++;
817 }
818 p2++;
819 }
820 cfg.host[p1] = '\0';
821 }
822
823 if (!cfg.remote_cmd_ptr && !*cfg.remote_cmd && !*cfg.ssh_nc_host)
824 flags |= FLAG_INTERACTIVE;
825
826 /*
827 * Select protocol. This is farmed out into a table in a
828 * separate file to enable an ssh-free variant.
829 */
830 back = backend_from_proto(cfg.protocol);
831 if (back == NULL) {
832 fprintf(stderr,
833 "Internal fault: Unsupported protocol found\n");
834 return 1;
835 }
836
837 /*
838 * Select port.
839 */
840 if (portnumber != -1)
841 cfg.port = portnumber;
842
843 /*
844 * Set up the pipe we'll use to tell us about SIGWINCH.
845 */
846 if (pipe(signalpipe) < 0) {
847 perror("pipe");
848 exit(1);
849 }
850 putty_signal(SIGWINCH, sigwinch);
851
852 sk_init();
853 uxsel_init();
854
855 /*
856 * Start up the connection.
857 */
858 logctx = log_init(NULL, &cfg);
859 console_provide_logctx(logctx);
860 {
861 const char *error;
862 char *realhost;
863 /* nodelay is only useful if stdin is a terminal device */
864 int nodelay = cfg.tcp_nodelay && isatty(0);
865
866 error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
867 &realhost, nodelay, cfg.tcp_keepalives);
868 if (error) {
869 fprintf(stderr, "Unable to open connection:\n%s\n", error);
870 return 1;
871 }
872 back->provide_logctx(backhandle, logctx);
873 ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL);
874 sfree(realhost);
875 }
876 connopen = 1;
877
878 /*
879 * Set up the initial console mode. We don't care if this call
880 * fails, because we know we aren't necessarily running in a
881 * console.
882 */
883 local_tty = (tcgetattr(0, &orig_termios) == 0);
884 atexit(cleanup_termios);
885 ldisc_update(NULL, 1, 1);
886 sending = FALSE;
887 now = GETTICKCOUNT();
888
889 while (1) {
890 fd_set rset, wset, xset;
891 int maxfd;
892 int rwx;
893 int ret;
894
895 FD_ZERO(&rset);
896 FD_ZERO(&wset);
897 FD_ZERO(&xset);
898 maxfd = 0;
899
900 FD_SET_MAX(signalpipe[0], maxfd, rset);
901
902 if (connopen && !sending &&
903 back->connected(backhandle) &&
904 back->sendok(backhandle) &&
905 back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
906 /* If we're OK to send, then try to read from stdin. */
907 FD_SET_MAX(0, maxfd, rset);
908 }
909
910 if (bufchain_size(&stdout_data) > 0) {
911 /* If we have data for stdout, try to write to stdout. */
912 FD_SET_MAX(1, maxfd, wset);
913 }
914
915 if (bufchain_size(&stderr_data) > 0) {
916 /* If we have data for stderr, try to write to stderr. */
917 FD_SET_MAX(2, maxfd, wset);
918 }
919
920 /* Count the currently active fds. */
921 i = 0;
922 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
923 fd = next_fd(&fdstate, &rwx)) i++;
924
925 /* Expand the fdlist buffer if necessary. */
926 if (i > fdsize) {
927 fdsize = i + 16;
928 fdlist = sresize(fdlist, fdsize, int);
929 }
930
931 /*
932 * Add all currently open fds to the select sets, and store
933 * them in fdlist as well.
934 */
935 fdcount = 0;
936 for (fd = first_fd(&fdstate, &rwx); fd >= 0;
937 fd = next_fd(&fdstate, &rwx)) {
938 fdlist[fdcount++] = fd;
939 if (rwx & 1)
940 FD_SET_MAX(fd, maxfd, rset);
941 if (rwx & 2)
942 FD_SET_MAX(fd, maxfd, wset);
943 if (rwx & 4)
944 FD_SET_MAX(fd, maxfd, xset);
945 }
946
947 do {
948 long next, ticks;
949 struct timeval tv, *ptv;
950
951 if (run_timers(now, &next)) {
952 ticks = next - GETTICKCOUNT();
953 if (ticks < 0) ticks = 0; /* just in case */
954 tv.tv_sec = ticks / 1000;
955 tv.tv_usec = ticks % 1000 * 1000;
956 ptv = &tv;
957 } else {
958 ptv = NULL;
959 }
960 ret = select(maxfd, &rset, &wset, &xset, ptv);
961 if (ret == 0)
962 now = next;
963 else {
964 long newnow = GETTICKCOUNT();
965 /*
966 * Check to see whether the system clock has
967 * changed massively during the select.
968 */
969 if (newnow - now < 0 || newnow - now > next - now) {
970 /*
971 * If so, look at the elapsed time in the
972 * select and use it to compute a new
973 * tickcount_offset.
974 */
975 long othernow = now + tv.tv_sec * 1000 + tv.tv_usec / 1000;
976 /* So we'd like GETTICKCOUNT to have returned othernow,
977 * but instead it return newnow. Hence ... */
978 tickcount_offset += othernow - newnow;
979 now = othernow;
980 } else {
981 now = newnow;
982 }
983 }
984 } while (ret < 0 && errno == EINTR);
985
986 if (ret < 0) {
987 perror("select");
988 exit(1);
989 }
990
991 for (i = 0; i < fdcount; i++) {
992 fd = fdlist[i];
993 /*
994 * We must process exceptional notifications before
995 * ordinary readability ones, or we may go straight
996 * past the urgent marker.
997 */
998 if (FD_ISSET(fd, &xset))
999 select_result(fd, 4);
1000 if (FD_ISSET(fd, &rset))
1001 select_result(fd, 1);
1002 if (FD_ISSET(fd, &wset))
1003 select_result(fd, 2);
1004 }
1005
1006 if (FD_ISSET(signalpipe[0], &rset)) {
1007 char c[1];
1008 struct winsize size;
1009 read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */
1010 if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
1011 back->size(backhandle, size.ws_col, size.ws_row);
1012 }
1013
1014 if (FD_ISSET(0, &rset)) {
1015 char buf[4096];
1016 int ret;
1017
1018 if (connopen && back->connected(backhandle)) {
1019 ret = read(0, buf, sizeof(buf));
1020 if (ret < 0) {
1021 perror("stdin: read");
1022 exit(1);
1023 } else if (ret == 0) {
1024 back->special(backhandle, TS_EOF);
1025 sending = FALSE; /* send nothing further after this */
1026 } else {
1027 if (local_tty)
1028 from_tty(buf, ret);
1029 else
1030 back->send(backhandle, buf, ret);
1031 }
1032 }
1033 }
1034
1035 if (FD_ISSET(1, &wset)) {
1036 try_output(0);
1037 }
1038
1039 if (FD_ISSET(2, &wset)) {
1040 try_output(1);
1041 }
1042
1043 if ((!connopen || !back->connected(backhandle)) &&
1044 bufchain_size(&stdout_data) == 0 &&
1045 bufchain_size(&stderr_data) == 0)
1046 break; /* we closed the connection */
1047 }
1048 exitcode = back->exitcode(backhandle);
1049 if (exitcode < 0) {
1050 fprintf(stderr, "Remote process exit code unavailable\n");
1051 exitcode = 1; /* this is an error condition */
1052 }
1053 cleanup_exit(exitcode);
1054 return exitcode; /* shouldn't happen, but placates gcc */
1055 }
Local modifications for Simon Tatham's `PuTTY' SSH client and terminal emulator