c5e438ec |
1 | /* |
2 | * PLink - a command-line (stdin/stdout) variant of PuTTY. |
3 | */ |
4 | |
5 | #include <stdio.h> |
6 | #include <stdlib.h> |
5673d44e |
7 | #include <errno.h> |
c5e438ec |
8 | #include <assert.h> |
9 | #include <stdarg.h> |
5673d44e |
10 | #include <signal.h> |
c5e438ec |
11 | #include <unistd.h> |
12 | #include <fcntl.h> |
13 | #include <termios.h> |
5a9eb105 |
14 | #include <pwd.h> |
15 | #include <sys/ioctl.h> |
2a6848cc |
16 | #include <sys/select.h> |
c5e438ec |
17 | |
c5e438ec |
18 | #define PUTTY_DO_GLOBALS /* actually _define_ globals */ |
19 | #include "putty.h" |
20 | #include "storage.h" |
21 | #include "tree234.h" |
22 | |
23 | #define MAX_STDIN_BACKLOG 4096 |
24 | |
25 | void fatalbox(char *p, ...) |
26 | { |
27 | va_list ap; |
28 | fprintf(stderr, "FATAL ERROR: "); |
29 | va_start(ap, p); |
30 | vfprintf(stderr, p, ap); |
31 | va_end(ap); |
32 | fputc('\n', stderr); |
33 | cleanup_exit(1); |
34 | } |
35 | void modalfatalbox(char *p, ...) |
36 | { |
37 | va_list ap; |
38 | fprintf(stderr, "FATAL ERROR: "); |
39 | va_start(ap, p); |
40 | vfprintf(stderr, p, ap); |
41 | va_end(ap); |
42 | fputc('\n', stderr); |
43 | cleanup_exit(1); |
44 | } |
45 | void connection_fatal(void *frontend, char *p, ...) |
46 | { |
47 | va_list ap; |
48 | fprintf(stderr, "FATAL ERROR: "); |
49 | va_start(ap, p); |
50 | vfprintf(stderr, p, ap); |
51 | va_end(ap); |
52 | fputc('\n', stderr); |
53 | cleanup_exit(1); |
54 | } |
55 | void cmdline_error(char *p, ...) |
56 | { |
57 | va_list ap; |
58 | fprintf(stderr, "plink: "); |
59 | va_start(ap, p); |
60 | vfprintf(stderr, p, ap); |
61 | va_end(ap); |
62 | fputc('\n', stderr); |
63 | exit(1); |
64 | } |
65 | |
66 | struct termios orig_termios; |
67 | |
68 | static Backend *back; |
69 | static void *backhandle; |
3ea863a3 |
70 | static Config cfg; |
c5e438ec |
71 | |
5a9eb105 |
72 | /* |
73 | * Default settings that are specific to pterm. |
74 | */ |
c85623f9 |
75 | char *platform_default_s(const char *name) |
5a9eb105 |
76 | { |
5a9eb105 |
77 | if (!strcmp(name, "TermType")) |
799dfcfa |
78 | return dupstr(getenv("TERM")); |
79 | if (!strcmp(name, "UserName")) |
80 | return get_username(); |
5a9eb105 |
81 | return NULL; |
82 | } |
83 | |
c85623f9 |
84 | int platform_default_i(const char *name, int def) |
5a9eb105 |
85 | { |
86 | if (!strcmp(name, "TermWidth") || |
87 | !strcmp(name, "TermHeight")) { |
88 | struct winsize size; |
89 | if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0) |
90 | return (!strcmp(name, "TermWidth") ? size.ws_col : size.ws_row); |
91 | } |
92 | return def; |
93 | } |
94 | |
9a30e26b |
95 | FontSpec platform_default_fontspec(const char *name) |
96 | { |
97 | FontSpec ret; |
98 | *ret.name = '\0'; |
99 | return ret; |
100 | } |
101 | |
102 | Filename platform_default_filename(const char *name) |
103 | { |
104 | Filename ret; |
105 | if (!strcmp(name, "LogFileName")) |
106 | strcpy(ret.path, "putty.log"); |
107 | else |
108 | *ret.path = '\0'; |
109 | return ret; |
110 | } |
111 | |
c85623f9 |
112 | char *x_get_default(const char *key) |
c5e438ec |
113 | { |
114 | return NULL; /* this is a stub */ |
115 | } |
116 | int term_ldisc(Terminal *term, int mode) |
117 | { |
118 | return FALSE; |
119 | } |
120 | void ldisc_update(void *frontend, int echo, int edit) |
121 | { |
122 | /* Update stdin read mode to reflect changes in line discipline. */ |
123 | struct termios mode; |
124 | |
125 | mode = orig_termios; |
126 | |
127 | if (echo) |
128 | mode.c_lflag |= ECHO; |
129 | else |
130 | mode.c_lflag &= ~ECHO; |
131 | |
8cdf0e5f |
132 | if (edit) { |
133 | mode.c_iflag |= ICRNL; |
c5e438ec |
134 | mode.c_lflag |= ISIG | ICANON; |
8cdf0e5f |
135 | } else { |
136 | mode.c_iflag &= ~ICRNL; |
c5e438ec |
137 | mode.c_lflag &= ~(ISIG | ICANON); |
259d0428 |
138 | mode.c_cc[VMIN] = 1; |
139 | mode.c_cc[VTIME] = 0; |
8cdf0e5f |
140 | } |
c5e438ec |
141 | |
142 | tcsetattr(0, TCSANOW, &mode); |
143 | } |
144 | |
145 | void cleanup_termios(void) |
146 | { |
147 | tcsetattr(0, TCSANOW, &orig_termios); |
148 | } |
149 | |
150 | bufchain stdout_data, stderr_data; |
151 | |
152 | void try_output(int is_stderr) |
153 | { |
154 | bufchain *chain = (is_stderr ? &stderr_data : &stdout_data); |
155 | int fd = (is_stderr ? 2 : 1); |
156 | void *senddata; |
157 | int sendlen, ret; |
158 | |
d69a46c0 |
159 | if (bufchain_size(chain) == 0) |
160 | return; |
161 | |
c5e438ec |
162 | bufchain_prefix(chain, &senddata, &sendlen); |
163 | ret = write(fd, senddata, sendlen); |
164 | if (ret > 0) |
165 | bufchain_consume(chain, ret); |
166 | else if (ret < 0) { |
167 | perror(is_stderr ? "stderr: write" : "stdout: write"); |
168 | exit(1); |
169 | } |
170 | } |
171 | |
9fab77dc |
172 | int from_backend(void *frontend_handle, int is_stderr, |
173 | const char *data, int len) |
c5e438ec |
174 | { |
175 | int osize, esize; |
176 | |
c5e438ec |
177 | if (is_stderr) { |
178 | bufchain_add(&stderr_data, data, len); |
179 | try_output(1); |
180 | } else { |
181 | bufchain_add(&stdout_data, data, len); |
182 | try_output(0); |
183 | } |
184 | |
185 | osize = bufchain_size(&stdout_data); |
186 | esize = bufchain_size(&stderr_data); |
187 | |
188 | return osize + esize; |
189 | } |
190 | |
5673d44e |
191 | int signalpipe[2]; |
192 | |
193 | void sigwinch(int signum) |
194 | { |
195 | write(signalpipe[1], "x", 1); |
196 | } |
197 | |
c5e438ec |
198 | /* |
74aca06d |
199 | * In Plink our selects are synchronous, so these functions are |
200 | * empty stubs. |
201 | */ |
202 | int uxsel_input_add(int fd, int rwx) { return 0; } |
203 | void uxsel_input_remove(int id) { } |
204 | |
205 | /* |
c5e438ec |
206 | * Short description of parameters. |
207 | */ |
208 | static void usage(void) |
209 | { |
210 | printf("PuTTY Link: command-line connection utility\n"); |
211 | printf("%s\n", ver); |
212 | printf("Usage: plink [options] [user@]host [command]\n"); |
213 | printf(" (\"host\" can also be a PuTTY saved session name)\n"); |
214 | printf("Options:\n"); |
2285d016 |
215 | printf(" -V print version information and exit\n"); |
216 | printf(" -pgpfp print PGP key fingerprints and exit\n"); |
c5e438ec |
217 | printf(" -v show verbose messages\n"); |
218 | printf(" -load sessname Load settings from saved session\n"); |
219 | printf(" -ssh -telnet -rlogin -raw\n"); |
afd4d0d2 |
220 | printf(" force use of a particular protocol\n"); |
c5e438ec |
221 | printf(" -P port connect to specified port\n"); |
222 | printf(" -l user connect with specified username\n"); |
c5e438ec |
223 | printf(" -batch disable all interactive prompts\n"); |
224 | printf("The following options only apply to SSH connections:\n"); |
225 | printf(" -pw passw login with specified password\n"); |
dbe6c525 |
226 | printf(" -D [listen-IP:]listen-port\n"); |
227 | printf(" Dynamic SOCKS-based port forwarding\n"); |
228 | printf(" -L [listen-IP:]listen-port:host:port\n"); |
229 | printf(" Forward local port to remote address\n"); |
230 | printf(" -R [listen-IP:]listen-port:host:port\n"); |
231 | printf(" Forward remote port to local address\n"); |
c5e438ec |
232 | printf(" -X -x enable / disable X11 forwarding\n"); |
233 | printf(" -A -a enable / disable agent forwarding\n"); |
234 | printf(" -t -T enable / disable pty allocation\n"); |
235 | printf(" -1 -2 force use of particular protocol version\n"); |
05581745 |
236 | printf(" -4 -6 force use of IPv4 or IPv6\n"); |
c5e438ec |
237 | printf(" -C enable compression\n"); |
238 | printf(" -i key private key file for authentication\n"); |
54018d95 |
239 | printf(" -m file read remote command(s) from file\n"); |
09bdfcbb |
240 | printf(" -s remote command is an SSH subsystem (SSH-2 only)\n"); |
b72c366d |
241 | printf(" -N don't start a shell/command (SSH-2 only)\n"); |
dc108ebc |
242 | exit(1); |
243 | } |
244 | |
245 | static void version(void) |
246 | { |
247 | printf("plink: %s\n", ver); |
c5e438ec |
248 | exit(1); |
249 | } |
250 | |
251 | int main(int argc, char **argv) |
252 | { |
253 | int sending; |
254 | int portnumber = -1; |
0ff9ea38 |
255 | int *fdlist; |
256 | int fd; |
257 | int i, fdcount, fdsize, fdstate; |
c5e438ec |
258 | int connopen; |
259 | int exitcode; |
86256dc6 |
260 | int errors; |
09bdfcbb |
261 | int use_subsystem = 0; |
b51259f6 |
262 | void *ldisc, *logctx; |
39934deb |
263 | long now; |
c5e438ec |
264 | |
265 | ssh_get_line = console_get_line; |
266 | |
0ff9ea38 |
267 | fdlist = NULL; |
268 | fdcount = fdsize = 0; |
c5e438ec |
269 | /* |
270 | * Initialise port and protocol to sensible defaults. (These |
271 | * will be overridden by more or less anything.) |
272 | */ |
273 | default_protocol = PROT_SSH; |
274 | default_port = 22; |
275 | |
276 | flags = FLAG_STDERR; |
277 | /* |
278 | * Process the command line. |
279 | */ |
280 | do_defaults(NULL, &cfg); |
18e62ad8 |
281 | loaded_session = FALSE; |
c5e438ec |
282 | default_protocol = cfg.protocol; |
283 | default_port = cfg.port; |
86256dc6 |
284 | errors = 0; |
c5e438ec |
285 | { |
286 | /* |
287 | * Override the default protocol if PLINK_PROTOCOL is set. |
288 | */ |
289 | char *p = getenv("PLINK_PROTOCOL"); |
290 | int i; |
291 | if (p) { |
292 | for (i = 0; backends[i].backend != NULL; i++) { |
293 | if (!strcmp(backends[i].name, p)) { |
294 | default_protocol = cfg.protocol = backends[i].protocol; |
295 | default_port = cfg.port = |
296 | backends[i].backend->default_port; |
297 | break; |
298 | } |
299 | } |
300 | } |
301 | } |
302 | while (--argc) { |
303 | char *p = *++argv; |
304 | if (*p == '-') { |
9b41d3a8 |
305 | int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL), |
306 | 1, &cfg); |
c5e438ec |
307 | if (ret == -2) { |
308 | fprintf(stderr, |
309 | "plink: option \"%s\" requires an argument\n", p); |
86256dc6 |
310 | errors = 1; |
c5e438ec |
311 | } else if (ret == 2) { |
312 | --argc, ++argv; |
313 | } else if (ret == 1) { |
314 | continue; |
315 | } else if (!strcmp(p, "-batch")) { |
316 | console_batch_mode = 1; |
09bdfcbb |
317 | } else if (!strcmp(p, "-s")) { |
318 | /* Save status to write to cfg later. */ |
319 | use_subsystem = 1; |
dc108ebc |
320 | } else if (!strcmp(p, "-V")) { |
321 | version(); |
2285d016 |
322 | } else if (!strcmp(p, "-pgpfp")) { |
323 | pgp_fingerprints(); |
324 | exit(1); |
a0e5ed33 |
325 | } else if (!strcmp(p, "-o")) { |
86256dc6 |
326 | if (argc <= 1) { |
a0e5ed33 |
327 | fprintf(stderr, |
328 | "plink: option \"-o\" requires an argument\n"); |
86256dc6 |
329 | errors = 1; |
330 | } else { |
331 | --argc; |
332 | provide_xrm_string(*++argv); |
333 | } |
334 | } else { |
335 | fprintf(stderr, "plink: unknown option \"%s\"\n", p); |
336 | errors = 1; |
c5e438ec |
337 | } |
338 | } else if (*p) { |
339 | if (!*cfg.host) { |
340 | char *q = p; |
a0e5ed33 |
341 | |
342 | do_defaults(NULL, &cfg); |
343 | |
c5e438ec |
344 | /* |
345 | * If the hostname starts with "telnet:", set the |
346 | * protocol to Telnet and process the string as a |
347 | * Telnet URL. |
348 | */ |
349 | if (!strncmp(q, "telnet:", 7)) { |
350 | char c; |
351 | |
352 | q += 7; |
353 | if (q[0] == '/' && q[1] == '/') |
354 | q += 2; |
355 | cfg.protocol = PROT_TELNET; |
356 | p = q; |
357 | while (*p && *p != ':' && *p != '/') |
358 | p++; |
359 | c = *p; |
360 | if (*p) |
361 | *p++ = '\0'; |
362 | if (c == ':') |
363 | cfg.port = atoi(p); |
364 | else |
365 | cfg.port = -1; |
366 | strncpy(cfg.host, q, sizeof(cfg.host) - 1); |
367 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
368 | } else { |
3608528b |
369 | char *r, *user, *host; |
c5e438ec |
370 | /* |
371 | * Before we process the [user@]host string, we |
372 | * first check for the presence of a protocol |
373 | * prefix (a protocol name followed by ","). |
374 | */ |
375 | r = strchr(p, ','); |
376 | if (r) { |
377 | int i, j; |
378 | for (i = 0; backends[i].backend != NULL; i++) { |
379 | j = strlen(backends[i].name); |
380 | if (j == r - p && |
381 | !memcmp(backends[i].name, p, j)) { |
382 | default_protocol = cfg.protocol = |
383 | backends[i].protocol; |
384 | portnumber = |
385 | backends[i].backend->default_port; |
386 | p = r + 1; |
387 | break; |
388 | } |
389 | } |
390 | } |
391 | |
392 | /* |
3608528b |
393 | * A nonzero length string followed by an @ is treated |
394 | * as a username. (We discount an _initial_ @.) The |
395 | * rest of the string (or the whole string if no @) |
396 | * is treated as a session name and/or hostname. |
c5e438ec |
397 | */ |
398 | r = strrchr(p, '@'); |
399 | if (r == p) |
400 | p++, r = NULL; /* discount initial @ */ |
3608528b |
401 | if (r) { |
402 | *r++ = '\0'; |
403 | user = p, host = r; |
404 | } else { |
405 | user = NULL, host = p; |
406 | } |
407 | |
408 | /* |
409 | * Now attempt to load a saved session with the |
410 | * same name as the hostname. |
411 | */ |
412 | { |
c5e438ec |
413 | Config cfg2; |
3608528b |
414 | do_defaults(host, &cfg2); |
18e62ad8 |
415 | if (loaded_session || cfg2.host[0] == '\0') { |
c5e438ec |
416 | /* No settings for this host; use defaults */ |
18e62ad8 |
417 | /* (or session was already loaded with -load) */ |
3608528b |
418 | strncpy(cfg.host, host, sizeof(cfg.host) - 1); |
c5e438ec |
419 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
420 | cfg.port = default_port; |
421 | } else { |
422 | cfg = cfg2; |
c5e438ec |
423 | } |
3608528b |
424 | } |
425 | |
426 | if (user) { |
427 | /* Patch in specified username. */ |
428 | strncpy(cfg.username, user, |
429 | sizeof(cfg.username) - 1); |
c5e438ec |
430 | cfg.username[sizeof(cfg.username) - 1] = '\0'; |
c5e438ec |
431 | } |
3608528b |
432 | |
c5e438ec |
433 | } |
434 | } else { |
435 | char *command; |
436 | int cmdlen, cmdsize; |
437 | cmdlen = cmdsize = 0; |
438 | command = NULL; |
439 | |
440 | while (argc) { |
441 | while (*p) { |
442 | if (cmdlen >= cmdsize) { |
443 | cmdsize = cmdlen + 512; |
3d88e64d |
444 | command = sresize(command, cmdsize, char); |
c5e438ec |
445 | } |
446 | command[cmdlen++]=*p++; |
447 | } |
448 | if (cmdlen >= cmdsize) { |
449 | cmdsize = cmdlen + 512; |
3d88e64d |
450 | command = sresize(command, cmdsize, char); |
c5e438ec |
451 | } |
452 | command[cmdlen++]=' '; /* always add trailing space */ |
453 | if (--argc) p = *++argv; |
454 | } |
455 | if (cmdlen) command[--cmdlen]='\0'; |
456 | /* change trailing blank to NUL */ |
457 | cfg.remote_cmd_ptr = command; |
458 | cfg.remote_cmd_ptr2 = NULL; |
459 | cfg.nopty = TRUE; /* command => no terminal */ |
460 | |
461 | break; /* done with cmdline */ |
462 | } |
463 | } |
464 | } |
465 | |
86256dc6 |
466 | if (errors) |
467 | return 1; |
468 | |
c5e438ec |
469 | if (!*cfg.host) { |
470 | usage(); |
471 | } |
472 | |
473 | /* |
474 | * Trim leading whitespace off the hostname if it's there. |
475 | */ |
476 | { |
477 | int space = strspn(cfg.host, " \t"); |
478 | memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space); |
479 | } |
480 | |
481 | /* See if host is of the form user@host */ |
482 | if (cfg.host[0] != '\0') { |
5dd103a8 |
483 | char *atsign = strrchr(cfg.host, '@'); |
c5e438ec |
484 | /* Make sure we're not overflowing the user field */ |
485 | if (atsign) { |
486 | if (atsign - cfg.host < sizeof cfg.username) { |
487 | strncpy(cfg.username, cfg.host, atsign - cfg.host); |
488 | cfg.username[atsign - cfg.host] = '\0'; |
489 | } |
490 | memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1)); |
491 | } |
492 | } |
493 | |
494 | /* |
495 | * Perform command-line overrides on session configuration. |
496 | */ |
9b41d3a8 |
497 | cmdline_run_saved(&cfg); |
c5e438ec |
498 | |
499 | /* |
09bdfcbb |
500 | * Apply subsystem status. |
501 | */ |
502 | if (use_subsystem) |
503 | cfg.ssh_subsys = TRUE; |
504 | |
505 | /* |
c5e438ec |
506 | * Trim a colon suffix off the hostname if it's there. |
507 | */ |
508 | cfg.host[strcspn(cfg.host, ":")] = '\0'; |
509 | |
510 | /* |
511 | * Remove any remaining whitespace from the hostname. |
512 | */ |
513 | { |
514 | int p1 = 0, p2 = 0; |
515 | while (cfg.host[p2] != '\0') { |
516 | if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') { |
517 | cfg.host[p1] = cfg.host[p2]; |
518 | p1++; |
519 | } |
520 | p2++; |
521 | } |
522 | cfg.host[p1] = '\0'; |
523 | } |
524 | |
a79e1969 |
525 | if (!cfg.remote_cmd_ptr && !*cfg.remote_cmd) |
c5e438ec |
526 | flags |= FLAG_INTERACTIVE; |
527 | |
528 | /* |
529 | * Select protocol. This is farmed out into a table in a |
530 | * separate file to enable an ssh-free variant. |
531 | */ |
532 | { |
533 | int i; |
534 | back = NULL; |
535 | for (i = 0; backends[i].backend != NULL; i++) |
536 | if (backends[i].protocol == cfg.protocol) { |
537 | back = backends[i].backend; |
538 | break; |
539 | } |
540 | if (back == NULL) { |
541 | fprintf(stderr, |
542 | "Internal fault: Unsupported protocol found\n"); |
543 | return 1; |
544 | } |
545 | } |
546 | |
547 | /* |
548 | * Select port. |
549 | */ |
550 | if (portnumber != -1) |
551 | cfg.port = portnumber; |
552 | |
5673d44e |
553 | /* |
554 | * Set up the pipe we'll use to tell us about SIGWINCH. |
555 | */ |
556 | if (pipe(signalpipe) < 0) { |
557 | perror("pipe"); |
558 | exit(1); |
559 | } |
560 | putty_signal(SIGWINCH, sigwinch); |
561 | |
c5e438ec |
562 | sk_init(); |
0ff9ea38 |
563 | uxsel_init(); |
c5e438ec |
564 | |
565 | /* |
566 | * Start up the connection. |
567 | */ |
c229ef97 |
568 | logctx = log_init(NULL, &cfg); |
b51259f6 |
569 | console_provide_logctx(logctx); |
c5e438ec |
570 | { |
cbe2d68f |
571 | const char *error; |
c5e438ec |
572 | char *realhost; |
573 | /* nodelay is only useful if stdin is a terminal device */ |
574 | int nodelay = cfg.tcp_nodelay && isatty(0); |
575 | |
86916870 |
576 | error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port, |
79bf227b |
577 | &realhost, nodelay, cfg.tcp_keepalives); |
c5e438ec |
578 | if (error) { |
984992ef |
579 | fprintf(stderr, "Unable to open connection:\n%s\n", error); |
c5e438ec |
580 | return 1; |
581 | } |
c5e438ec |
582 | back->provide_logctx(backhandle, logctx); |
fe5634f6 |
583 | ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL); |
c5e438ec |
584 | sfree(realhost); |
585 | } |
586 | connopen = 1; |
587 | |
588 | /* |
589 | * Set up the initial console mode. We don't care if this call |
590 | * fails, because we know we aren't necessarily running in a |
591 | * console. |
592 | */ |
593 | tcgetattr(0, &orig_termios); |
594 | atexit(cleanup_termios); |
595 | ldisc_update(NULL, 1, 1); |
596 | sending = FALSE; |
39934deb |
597 | now = GETTICKCOUNT(); |
c5e438ec |
598 | |
599 | while (1) { |
600 | fd_set rset, wset, xset; |
601 | int maxfd; |
602 | int rwx; |
603 | int ret; |
604 | |
605 | FD_ZERO(&rset); |
606 | FD_ZERO(&wset); |
607 | FD_ZERO(&xset); |
608 | maxfd = 0; |
609 | |
5673d44e |
610 | FD_SET_MAX(signalpipe[0], maxfd, rset); |
611 | |
c5e438ec |
612 | if (connopen && !sending && |
613 | back->socket(backhandle) != NULL && |
614 | back->sendok(backhandle) && |
615 | back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) { |
616 | /* If we're OK to send, then try to read from stdin. */ |
617 | FD_SET_MAX(0, maxfd, rset); |
618 | } |
619 | |
620 | if (bufchain_size(&stdout_data) > 0) { |
621 | /* If we have data for stdout, try to write to stdout. */ |
622 | FD_SET_MAX(1, maxfd, wset); |
623 | } |
624 | |
625 | if (bufchain_size(&stderr_data) > 0) { |
626 | /* If we have data for stderr, try to write to stderr. */ |
627 | FD_SET_MAX(2, maxfd, wset); |
628 | } |
629 | |
0ff9ea38 |
630 | /* Count the currently active fds. */ |
c5e438ec |
631 | i = 0; |
0ff9ea38 |
632 | for (fd = first_fd(&fdstate, &rwx); fd >= 0; |
633 | fd = next_fd(&fdstate, &rwx)) i++; |
c5e438ec |
634 | |
0ff9ea38 |
635 | /* Expand the fdlist buffer if necessary. */ |
636 | if (i > fdsize) { |
637 | fdsize = i + 16; |
638 | fdlist = sresize(fdlist, fdsize, int); |
c5e438ec |
639 | } |
640 | |
641 | /* |
0ff9ea38 |
642 | * Add all currently open fds to the select sets, and store |
643 | * them in fdlist as well. |
c5e438ec |
644 | */ |
0ff9ea38 |
645 | fdcount = 0; |
646 | for (fd = first_fd(&fdstate, &rwx); fd >= 0; |
647 | fd = next_fd(&fdstate, &rwx)) { |
648 | fdlist[fdcount++] = fd; |
c5e438ec |
649 | if (rwx & 1) |
0ff9ea38 |
650 | FD_SET_MAX(fd, maxfd, rset); |
c5e438ec |
651 | if (rwx & 2) |
0ff9ea38 |
652 | FD_SET_MAX(fd, maxfd, wset); |
c5e438ec |
653 | if (rwx & 4) |
0ff9ea38 |
654 | FD_SET_MAX(fd, maxfd, xset); |
c5e438ec |
655 | } |
656 | |
5673d44e |
657 | do { |
39934deb |
658 | long next, ticks; |
659 | struct timeval tv, *ptv; |
660 | |
661 | if (run_timers(now, &next)) { |
662 | ticks = next - GETTICKCOUNT(); |
663 | if (ticks < 0) ticks = 0; /* just in case */ |
664 | tv.tv_sec = ticks / 1000; |
665 | tv.tv_usec = ticks % 1000 * 1000; |
666 | ptv = &tv; |
667 | } else { |
668 | ptv = NULL; |
669 | } |
670 | ret = select(maxfd, &rset, &wset, &xset, ptv); |
671 | if (ret == 0) |
672 | now = next; |
2ac3322e |
673 | else { |
674 | long newnow = GETTICKCOUNT(); |
675 | /* |
676 | * Check to see whether the system clock has |
677 | * changed massively during the select. |
678 | */ |
679 | if (newnow - now < 0 || newnow - now > next - now) { |
680 | /* |
681 | * If so, look at the elapsed time in the |
682 | * select and use it to compute a new |
683 | * tickcount_offset. |
684 | */ |
685 | long othernow = now + tv.tv_sec * 1000 + tv.tv_usec / 1000; |
686 | /* So we'd like GETTICKCOUNT to have returned othernow, |
687 | * but instead it return newnow. Hence ... */ |
688 | tickcount_offset += othernow - newnow; |
689 | now = othernow; |
690 | } else { |
691 | now = newnow; |
692 | } |
693 | } |
5673d44e |
694 | } while (ret < 0 && errno == EINTR); |
c5e438ec |
695 | |
696 | if (ret < 0) { |
697 | perror("select"); |
698 | exit(1); |
699 | } |
700 | |
0ff9ea38 |
701 | for (i = 0; i < fdcount; i++) { |
702 | fd = fdlist[i]; |
56e5b2db |
703 | /* |
704 | * We must process exceptional notifications before |
705 | * ordinary readability ones, or we may go straight |
706 | * past the urgent marker. |
707 | */ |
0ff9ea38 |
708 | if (FD_ISSET(fd, &xset)) |
709 | select_result(fd, 4); |
710 | if (FD_ISSET(fd, &rset)) |
711 | select_result(fd, 1); |
712 | if (FD_ISSET(fd, &wset)) |
713 | select_result(fd, 2); |
c5e438ec |
714 | } |
715 | |
5673d44e |
716 | if (FD_ISSET(signalpipe[0], &rset)) { |
717 | char c[1]; |
718 | struct winsize size; |
719 | read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */ |
720 | if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0) |
721 | back->size(backhandle, size.ws_col, size.ws_row); |
722 | } |
723 | |
c5e438ec |
724 | if (FD_ISSET(0, &rset)) { |
725 | char buf[4096]; |
726 | int ret; |
727 | |
728 | if (connopen && back->socket(backhandle) != NULL) { |
729 | ret = read(0, buf, sizeof(buf)); |
730 | if (ret < 0) { |
731 | perror("stdin: read"); |
732 | exit(1); |
733 | } else if (ret == 0) { |
734 | back->special(backhandle, TS_EOF); |
735 | sending = FALSE; /* send nothing further after this */ |
736 | } else { |
737 | back->send(backhandle, buf, ret); |
738 | } |
739 | } |
740 | } |
741 | |
742 | if (FD_ISSET(1, &wset)) { |
743 | try_output(0); |
744 | } |
745 | |
746 | if (FD_ISSET(2, &wset)) { |
747 | try_output(1); |
748 | } |
749 | |
750 | if ((!connopen || back->socket(backhandle) == NULL) && |
751 | bufchain_size(&stdout_data) == 0 && |
752 | bufchain_size(&stderr_data) == 0) |
753 | break; /* we closed the connection */ |
754 | } |
755 | exitcode = back->exitcode(backhandle); |
756 | if (exitcode < 0) { |
757 | fprintf(stderr, "Remote process exit code unavailable\n"); |
758 | exitcode = 1; /* this is an error condition */ |
759 | } |
d9c40fd6 |
760 | cleanup_exit(exitcode); |
761 | return exitcode; /* shouldn't happen, but placates gcc */ |
c5e438ec |
762 | } |