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> |
c5e438ec |
16 | |
c5e438ec |
17 | #define PUTTY_DO_GLOBALS /* actually _define_ globals */ |
18 | #include "putty.h" |
19 | #include "storage.h" |
20 | #include "tree234.h" |
21 | |
22 | #define MAX_STDIN_BACKLOG 4096 |
23 | |
24 | void fatalbox(char *p, ...) |
25 | { |
26 | va_list ap; |
27 | fprintf(stderr, "FATAL ERROR: "); |
28 | va_start(ap, p); |
29 | vfprintf(stderr, p, ap); |
30 | va_end(ap); |
31 | fputc('\n', stderr); |
32 | cleanup_exit(1); |
33 | } |
34 | void modalfatalbox(char *p, ...) |
35 | { |
36 | va_list ap; |
37 | fprintf(stderr, "FATAL ERROR: "); |
38 | va_start(ap, p); |
39 | vfprintf(stderr, p, ap); |
40 | va_end(ap); |
41 | fputc('\n', stderr); |
42 | cleanup_exit(1); |
43 | } |
44 | void connection_fatal(void *frontend, 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 | cleanup_exit(1); |
53 | } |
54 | void cmdline_error(char *p, ...) |
55 | { |
56 | va_list ap; |
57 | fprintf(stderr, "plink: "); |
58 | va_start(ap, p); |
59 | vfprintf(stderr, p, ap); |
60 | va_end(ap); |
61 | fputc('\n', stderr); |
62 | exit(1); |
63 | } |
64 | |
65 | struct termios orig_termios; |
66 | |
67 | static Backend *back; |
68 | static void *backhandle; |
3ea863a3 |
69 | static Config cfg; |
c5e438ec |
70 | |
5a9eb105 |
71 | /* |
72 | * Default settings that are specific to pterm. |
73 | */ |
c85623f9 |
74 | char *platform_default_s(const char *name) |
5a9eb105 |
75 | { |
5a9eb105 |
76 | if (!strcmp(name, "TermType")) |
799dfcfa |
77 | return dupstr(getenv("TERM")); |
78 | if (!strcmp(name, "UserName")) |
79 | return get_username(); |
5a9eb105 |
80 | return NULL; |
81 | } |
82 | |
c85623f9 |
83 | int platform_default_i(const char *name, int def) |
5a9eb105 |
84 | { |
85 | if (!strcmp(name, "TermWidth") || |
86 | !strcmp(name, "TermHeight")) { |
87 | struct winsize size; |
88 | if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0) |
89 | return (!strcmp(name, "TermWidth") ? size.ws_col : size.ws_row); |
90 | } |
91 | return def; |
92 | } |
93 | |
9a30e26b |
94 | FontSpec platform_default_fontspec(const char *name) |
95 | { |
96 | FontSpec ret; |
97 | *ret.name = '\0'; |
98 | return ret; |
99 | } |
100 | |
101 | Filename platform_default_filename(const char *name) |
102 | { |
103 | Filename ret; |
104 | if (!strcmp(name, "LogFileName")) |
105 | strcpy(ret.path, "putty.log"); |
106 | else |
107 | *ret.path = '\0'; |
108 | return ret; |
109 | } |
110 | |
c85623f9 |
111 | char *x_get_default(const char *key) |
c5e438ec |
112 | { |
113 | return NULL; /* this is a stub */ |
114 | } |
115 | int term_ldisc(Terminal *term, int mode) |
116 | { |
117 | return FALSE; |
118 | } |
119 | void ldisc_update(void *frontend, int echo, int edit) |
120 | { |
121 | /* Update stdin read mode to reflect changes in line discipline. */ |
122 | struct termios mode; |
123 | |
124 | mode = orig_termios; |
125 | |
126 | if (echo) |
127 | mode.c_lflag |= ECHO; |
128 | else |
129 | mode.c_lflag &= ~ECHO; |
130 | |
131 | if (edit) |
132 | mode.c_lflag |= ISIG | ICANON; |
133 | else |
134 | mode.c_lflag &= ~(ISIG | ICANON); |
135 | |
136 | tcsetattr(0, TCSANOW, &mode); |
137 | } |
138 | |
139 | void cleanup_termios(void) |
140 | { |
141 | tcsetattr(0, TCSANOW, &orig_termios); |
142 | } |
143 | |
144 | bufchain stdout_data, stderr_data; |
145 | |
146 | void try_output(int is_stderr) |
147 | { |
148 | bufchain *chain = (is_stderr ? &stderr_data : &stdout_data); |
149 | int fd = (is_stderr ? 2 : 1); |
150 | void *senddata; |
151 | int sendlen, ret; |
152 | |
d69a46c0 |
153 | if (bufchain_size(chain) == 0) |
154 | return; |
155 | |
c5e438ec |
156 | bufchain_prefix(chain, &senddata, &sendlen); |
157 | ret = write(fd, senddata, sendlen); |
158 | if (ret > 0) |
159 | bufchain_consume(chain, ret); |
160 | else if (ret < 0) { |
161 | perror(is_stderr ? "stderr: write" : "stdout: write"); |
162 | exit(1); |
163 | } |
164 | } |
165 | |
9fab77dc |
166 | int from_backend(void *frontend_handle, int is_stderr, |
167 | const char *data, int len) |
c5e438ec |
168 | { |
169 | int osize, esize; |
170 | |
c5e438ec |
171 | if (is_stderr) { |
172 | bufchain_add(&stderr_data, data, len); |
173 | try_output(1); |
174 | } else { |
175 | bufchain_add(&stdout_data, data, len); |
176 | try_output(0); |
177 | } |
178 | |
179 | osize = bufchain_size(&stdout_data); |
180 | esize = bufchain_size(&stderr_data); |
181 | |
182 | return osize + esize; |
183 | } |
184 | |
5673d44e |
185 | int signalpipe[2]; |
186 | |
187 | void sigwinch(int signum) |
188 | { |
189 | write(signalpipe[1], "x", 1); |
190 | } |
191 | |
c5e438ec |
192 | /* |
74aca06d |
193 | * In Plink our selects are synchronous, so these functions are |
194 | * empty stubs. |
195 | */ |
196 | int uxsel_input_add(int fd, int rwx) { return 0; } |
197 | void uxsel_input_remove(int id) { } |
198 | |
199 | /* |
c5e438ec |
200 | * Short description of parameters. |
201 | */ |
202 | static void usage(void) |
203 | { |
204 | printf("PuTTY Link: command-line connection utility\n"); |
205 | printf("%s\n", ver); |
206 | printf("Usage: plink [options] [user@]host [command]\n"); |
207 | printf(" (\"host\" can also be a PuTTY saved session name)\n"); |
208 | printf("Options:\n"); |
c9a13be6 |
209 | printf(" -V print version information\n"); |
c5e438ec |
210 | printf(" -v show verbose messages\n"); |
211 | printf(" -load sessname Load settings from saved session\n"); |
212 | printf(" -ssh -telnet -rlogin -raw\n"); |
afd4d0d2 |
213 | printf(" force use of a particular protocol\n"); |
c5e438ec |
214 | printf(" -P port connect to specified port\n"); |
215 | printf(" -l user connect with specified username\n"); |
216 | printf(" -m file read remote command(s) from file\n"); |
217 | printf(" -batch disable all interactive prompts\n"); |
218 | printf("The following options only apply to SSH connections:\n"); |
219 | printf(" -pw passw login with specified password\n"); |
dbe6c525 |
220 | printf(" -D [listen-IP:]listen-port\n"); |
221 | printf(" Dynamic SOCKS-based port forwarding\n"); |
222 | printf(" -L [listen-IP:]listen-port:host:port\n"); |
223 | printf(" Forward local port to remote address\n"); |
224 | printf(" -R [listen-IP:]listen-port:host:port\n"); |
225 | printf(" Forward remote port to local address\n"); |
c5e438ec |
226 | printf(" -X -x enable / disable X11 forwarding\n"); |
227 | printf(" -A -a enable / disable agent forwarding\n"); |
228 | printf(" -t -T enable / disable pty allocation\n"); |
229 | printf(" -1 -2 force use of particular protocol version\n"); |
05581745 |
230 | printf(" -4 -6 force use of IPv4 or IPv6\n"); |
c5e438ec |
231 | printf(" -C enable compression\n"); |
232 | printf(" -i key private key file for authentication\n"); |
09bdfcbb |
233 | printf(" -s remote command is an SSH subsystem (SSH-2 only)\n"); |
b72c366d |
234 | printf(" -N don't start a shell/command (SSH-2 only)\n"); |
dc108ebc |
235 | exit(1); |
236 | } |
237 | |
238 | static void version(void) |
239 | { |
240 | printf("plink: %s\n", ver); |
c5e438ec |
241 | exit(1); |
242 | } |
243 | |
244 | int main(int argc, char **argv) |
245 | { |
246 | int sending; |
247 | int portnumber = -1; |
0ff9ea38 |
248 | int *fdlist; |
249 | int fd; |
250 | int i, fdcount, fdsize, fdstate; |
c5e438ec |
251 | int connopen; |
252 | int exitcode; |
86256dc6 |
253 | int errors; |
09bdfcbb |
254 | int use_subsystem = 0; |
b51259f6 |
255 | void *ldisc, *logctx; |
39934deb |
256 | long now; |
c5e438ec |
257 | |
258 | ssh_get_line = console_get_line; |
259 | |
0ff9ea38 |
260 | fdlist = NULL; |
261 | fdcount = fdsize = 0; |
c5e438ec |
262 | /* |
263 | * Initialise port and protocol to sensible defaults. (These |
264 | * will be overridden by more or less anything.) |
265 | */ |
266 | default_protocol = PROT_SSH; |
267 | default_port = 22; |
268 | |
269 | flags = FLAG_STDERR; |
270 | /* |
271 | * Process the command line. |
272 | */ |
273 | do_defaults(NULL, &cfg); |
18e62ad8 |
274 | loaded_session = FALSE; |
c5e438ec |
275 | default_protocol = cfg.protocol; |
276 | default_port = cfg.port; |
86256dc6 |
277 | errors = 0; |
c5e438ec |
278 | { |
279 | /* |
280 | * Override the default protocol if PLINK_PROTOCOL is set. |
281 | */ |
282 | char *p = getenv("PLINK_PROTOCOL"); |
283 | int i; |
284 | if (p) { |
285 | for (i = 0; backends[i].backend != NULL; i++) { |
286 | if (!strcmp(backends[i].name, p)) { |
287 | default_protocol = cfg.protocol = backends[i].protocol; |
288 | default_port = cfg.port = |
289 | backends[i].backend->default_port; |
290 | break; |
291 | } |
292 | } |
293 | } |
294 | } |
295 | while (--argc) { |
296 | char *p = *++argv; |
297 | if (*p == '-') { |
9b41d3a8 |
298 | int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL), |
299 | 1, &cfg); |
c5e438ec |
300 | if (ret == -2) { |
301 | fprintf(stderr, |
302 | "plink: option \"%s\" requires an argument\n", p); |
86256dc6 |
303 | errors = 1; |
c5e438ec |
304 | } else if (ret == 2) { |
305 | --argc, ++argv; |
306 | } else if (ret == 1) { |
307 | continue; |
308 | } else if (!strcmp(p, "-batch")) { |
309 | console_batch_mode = 1; |
09bdfcbb |
310 | } else if (!strcmp(p, "-s")) { |
311 | /* Save status to write to cfg later. */ |
312 | use_subsystem = 1; |
dc108ebc |
313 | } else if (!strcmp(p, "-V")) { |
314 | version(); |
a0e5ed33 |
315 | } else if (!strcmp(p, "-o")) { |
86256dc6 |
316 | if (argc <= 1) { |
a0e5ed33 |
317 | fprintf(stderr, |
318 | "plink: option \"-o\" requires an argument\n"); |
86256dc6 |
319 | errors = 1; |
320 | } else { |
321 | --argc; |
322 | provide_xrm_string(*++argv); |
323 | } |
324 | } else { |
325 | fprintf(stderr, "plink: unknown option \"%s\"\n", p); |
326 | errors = 1; |
c5e438ec |
327 | } |
328 | } else if (*p) { |
329 | if (!*cfg.host) { |
330 | char *q = p; |
a0e5ed33 |
331 | |
332 | do_defaults(NULL, &cfg); |
333 | |
c5e438ec |
334 | /* |
335 | * If the hostname starts with "telnet:", set the |
336 | * protocol to Telnet and process the string as a |
337 | * Telnet URL. |
338 | */ |
339 | if (!strncmp(q, "telnet:", 7)) { |
340 | char c; |
341 | |
342 | q += 7; |
343 | if (q[0] == '/' && q[1] == '/') |
344 | q += 2; |
345 | cfg.protocol = PROT_TELNET; |
346 | p = q; |
347 | while (*p && *p != ':' && *p != '/') |
348 | p++; |
349 | c = *p; |
350 | if (*p) |
351 | *p++ = '\0'; |
352 | if (c == ':') |
353 | cfg.port = atoi(p); |
354 | else |
355 | cfg.port = -1; |
356 | strncpy(cfg.host, q, sizeof(cfg.host) - 1); |
357 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
358 | } else { |
3608528b |
359 | char *r, *user, *host; |
c5e438ec |
360 | /* |
361 | * Before we process the [user@]host string, we |
362 | * first check for the presence of a protocol |
363 | * prefix (a protocol name followed by ","). |
364 | */ |
365 | r = strchr(p, ','); |
366 | if (r) { |
367 | int i, j; |
368 | for (i = 0; backends[i].backend != NULL; i++) { |
369 | j = strlen(backends[i].name); |
370 | if (j == r - p && |
371 | !memcmp(backends[i].name, p, j)) { |
372 | default_protocol = cfg.protocol = |
373 | backends[i].protocol; |
374 | portnumber = |
375 | backends[i].backend->default_port; |
376 | p = r + 1; |
377 | break; |
378 | } |
379 | } |
380 | } |
381 | |
382 | /* |
3608528b |
383 | * A nonzero length string followed by an @ is treated |
384 | * as a username. (We discount an _initial_ @.) The |
385 | * rest of the string (or the whole string if no @) |
386 | * is treated as a session name and/or hostname. |
c5e438ec |
387 | */ |
388 | r = strrchr(p, '@'); |
389 | if (r == p) |
390 | p++, r = NULL; /* discount initial @ */ |
3608528b |
391 | if (r) { |
392 | *r++ = '\0'; |
393 | user = p, host = r; |
394 | } else { |
395 | user = NULL, host = p; |
396 | } |
397 | |
398 | /* |
399 | * Now attempt to load a saved session with the |
400 | * same name as the hostname. |
401 | */ |
402 | { |
c5e438ec |
403 | Config cfg2; |
3608528b |
404 | do_defaults(host, &cfg2); |
18e62ad8 |
405 | if (loaded_session || cfg2.host[0] == '\0') { |
c5e438ec |
406 | /* No settings for this host; use defaults */ |
18e62ad8 |
407 | /* (or session was already loaded with -load) */ |
3608528b |
408 | strncpy(cfg.host, host, sizeof(cfg.host) - 1); |
c5e438ec |
409 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
410 | cfg.port = default_port; |
411 | } else { |
412 | cfg = cfg2; |
18e62ad8 |
413 | /* Ick: patch up internal pointer after copy */ |
c5e438ec |
414 | cfg.remote_cmd_ptr = cfg.remote_cmd; |
415 | } |
3608528b |
416 | } |
417 | |
418 | if (user) { |
419 | /* Patch in specified username. */ |
420 | strncpy(cfg.username, user, |
421 | sizeof(cfg.username) - 1); |
c5e438ec |
422 | cfg.username[sizeof(cfg.username) - 1] = '\0'; |
c5e438ec |
423 | } |
3608528b |
424 | |
c5e438ec |
425 | } |
426 | } else { |
427 | char *command; |
428 | int cmdlen, cmdsize; |
429 | cmdlen = cmdsize = 0; |
430 | command = NULL; |
431 | |
432 | while (argc) { |
433 | while (*p) { |
434 | if (cmdlen >= cmdsize) { |
435 | cmdsize = cmdlen + 512; |
3d88e64d |
436 | command = sresize(command, cmdsize, char); |
c5e438ec |
437 | } |
438 | command[cmdlen++]=*p++; |
439 | } |
440 | if (cmdlen >= cmdsize) { |
441 | cmdsize = cmdlen + 512; |
3d88e64d |
442 | command = sresize(command, cmdsize, char); |
c5e438ec |
443 | } |
444 | command[cmdlen++]=' '; /* always add trailing space */ |
445 | if (--argc) p = *++argv; |
446 | } |
447 | if (cmdlen) command[--cmdlen]='\0'; |
448 | /* change trailing blank to NUL */ |
449 | cfg.remote_cmd_ptr = command; |
450 | cfg.remote_cmd_ptr2 = NULL; |
451 | cfg.nopty = TRUE; /* command => no terminal */ |
452 | |
453 | break; /* done with cmdline */ |
454 | } |
455 | } |
456 | } |
457 | |
86256dc6 |
458 | if (errors) |
459 | return 1; |
460 | |
c5e438ec |
461 | if (!*cfg.host) { |
462 | usage(); |
463 | } |
464 | |
465 | /* |
466 | * Trim leading whitespace off the hostname if it's there. |
467 | */ |
468 | { |
469 | int space = strspn(cfg.host, " \t"); |
470 | memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space); |
471 | } |
472 | |
473 | /* See if host is of the form user@host */ |
474 | if (cfg.host[0] != '\0') { |
5dd103a8 |
475 | char *atsign = strrchr(cfg.host, '@'); |
c5e438ec |
476 | /* Make sure we're not overflowing the user field */ |
477 | if (atsign) { |
478 | if (atsign - cfg.host < sizeof cfg.username) { |
479 | strncpy(cfg.username, cfg.host, atsign - cfg.host); |
480 | cfg.username[atsign - cfg.host] = '\0'; |
481 | } |
482 | memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1)); |
483 | } |
484 | } |
485 | |
486 | /* |
487 | * Perform command-line overrides on session configuration. |
488 | */ |
9b41d3a8 |
489 | cmdline_run_saved(&cfg); |
c5e438ec |
490 | |
491 | /* |
09bdfcbb |
492 | * Apply subsystem status. |
493 | */ |
494 | if (use_subsystem) |
495 | cfg.ssh_subsys = TRUE; |
496 | |
497 | /* |
c5e438ec |
498 | * Trim a colon suffix off the hostname if it's there. |
499 | */ |
500 | cfg.host[strcspn(cfg.host, ":")] = '\0'; |
501 | |
502 | /* |
503 | * Remove any remaining whitespace from the hostname. |
504 | */ |
505 | { |
506 | int p1 = 0, p2 = 0; |
507 | while (cfg.host[p2] != '\0') { |
508 | if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') { |
509 | cfg.host[p1] = cfg.host[p2]; |
510 | p1++; |
511 | } |
512 | p2++; |
513 | } |
514 | cfg.host[p1] = '\0'; |
515 | } |
516 | |
517 | if (!*cfg.remote_cmd_ptr) |
518 | flags |= FLAG_INTERACTIVE; |
519 | |
520 | /* |
521 | * Select protocol. This is farmed out into a table in a |
522 | * separate file to enable an ssh-free variant. |
523 | */ |
524 | { |
525 | int i; |
526 | back = NULL; |
527 | for (i = 0; backends[i].backend != NULL; i++) |
528 | if (backends[i].protocol == cfg.protocol) { |
529 | back = backends[i].backend; |
530 | break; |
531 | } |
532 | if (back == NULL) { |
533 | fprintf(stderr, |
534 | "Internal fault: Unsupported protocol found\n"); |
535 | return 1; |
536 | } |
537 | } |
538 | |
539 | /* |
540 | * Select port. |
541 | */ |
542 | if (portnumber != -1) |
543 | cfg.port = portnumber; |
544 | |
5673d44e |
545 | /* |
546 | * Set up the pipe we'll use to tell us about SIGWINCH. |
547 | */ |
548 | if (pipe(signalpipe) < 0) { |
549 | perror("pipe"); |
550 | exit(1); |
551 | } |
552 | putty_signal(SIGWINCH, sigwinch); |
553 | |
c5e438ec |
554 | sk_init(); |
0ff9ea38 |
555 | uxsel_init(); |
c5e438ec |
556 | |
557 | /* |
558 | * Start up the connection. |
559 | */ |
c229ef97 |
560 | logctx = log_init(NULL, &cfg); |
b51259f6 |
561 | console_provide_logctx(logctx); |
c5e438ec |
562 | { |
cbe2d68f |
563 | const char *error; |
c5e438ec |
564 | char *realhost; |
565 | /* nodelay is only useful if stdin is a terminal device */ |
566 | int nodelay = cfg.tcp_nodelay && isatty(0); |
567 | |
86916870 |
568 | error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port, |
79bf227b |
569 | &realhost, nodelay, cfg.tcp_keepalives); |
c5e438ec |
570 | if (error) { |
984992ef |
571 | fprintf(stderr, "Unable to open connection:\n%s\n", error); |
c5e438ec |
572 | return 1; |
573 | } |
c5e438ec |
574 | back->provide_logctx(backhandle, logctx); |
fe5634f6 |
575 | ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL); |
c5e438ec |
576 | sfree(realhost); |
577 | } |
578 | connopen = 1; |
579 | |
580 | /* |
581 | * Set up the initial console mode. We don't care if this call |
582 | * fails, because we know we aren't necessarily running in a |
583 | * console. |
584 | */ |
585 | tcgetattr(0, &orig_termios); |
586 | atexit(cleanup_termios); |
587 | ldisc_update(NULL, 1, 1); |
588 | sending = FALSE; |
39934deb |
589 | now = GETTICKCOUNT(); |
c5e438ec |
590 | |
591 | while (1) { |
592 | fd_set rset, wset, xset; |
593 | int maxfd; |
594 | int rwx; |
595 | int ret; |
596 | |
597 | FD_ZERO(&rset); |
598 | FD_ZERO(&wset); |
599 | FD_ZERO(&xset); |
600 | maxfd = 0; |
601 | |
5673d44e |
602 | FD_SET_MAX(signalpipe[0], maxfd, rset); |
603 | |
c5e438ec |
604 | if (connopen && !sending && |
605 | back->socket(backhandle) != NULL && |
606 | back->sendok(backhandle) && |
607 | back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) { |
608 | /* If we're OK to send, then try to read from stdin. */ |
609 | FD_SET_MAX(0, maxfd, rset); |
610 | } |
611 | |
612 | if (bufchain_size(&stdout_data) > 0) { |
613 | /* If we have data for stdout, try to write to stdout. */ |
614 | FD_SET_MAX(1, maxfd, wset); |
615 | } |
616 | |
617 | if (bufchain_size(&stderr_data) > 0) { |
618 | /* If we have data for stderr, try to write to stderr. */ |
619 | FD_SET_MAX(2, maxfd, wset); |
620 | } |
621 | |
0ff9ea38 |
622 | /* Count the currently active fds. */ |
c5e438ec |
623 | i = 0; |
0ff9ea38 |
624 | for (fd = first_fd(&fdstate, &rwx); fd >= 0; |
625 | fd = next_fd(&fdstate, &rwx)) i++; |
c5e438ec |
626 | |
0ff9ea38 |
627 | /* Expand the fdlist buffer if necessary. */ |
628 | if (i > fdsize) { |
629 | fdsize = i + 16; |
630 | fdlist = sresize(fdlist, fdsize, int); |
c5e438ec |
631 | } |
632 | |
633 | /* |
0ff9ea38 |
634 | * Add all currently open fds to the select sets, and store |
635 | * them in fdlist as well. |
c5e438ec |
636 | */ |
0ff9ea38 |
637 | fdcount = 0; |
638 | for (fd = first_fd(&fdstate, &rwx); fd >= 0; |
639 | fd = next_fd(&fdstate, &rwx)) { |
640 | fdlist[fdcount++] = fd; |
c5e438ec |
641 | if (rwx & 1) |
0ff9ea38 |
642 | FD_SET_MAX(fd, maxfd, rset); |
c5e438ec |
643 | if (rwx & 2) |
0ff9ea38 |
644 | FD_SET_MAX(fd, maxfd, wset); |
c5e438ec |
645 | if (rwx & 4) |
0ff9ea38 |
646 | FD_SET_MAX(fd, maxfd, xset); |
c5e438ec |
647 | } |
648 | |
5673d44e |
649 | do { |
39934deb |
650 | long next, ticks; |
651 | struct timeval tv, *ptv; |
652 | |
653 | if (run_timers(now, &next)) { |
654 | ticks = next - GETTICKCOUNT(); |
655 | if (ticks < 0) ticks = 0; /* just in case */ |
656 | tv.tv_sec = ticks / 1000; |
657 | tv.tv_usec = ticks % 1000 * 1000; |
658 | ptv = &tv; |
659 | } else { |
660 | ptv = NULL; |
661 | } |
662 | ret = select(maxfd, &rset, &wset, &xset, ptv); |
663 | if (ret == 0) |
664 | now = next; |
665 | else |
666 | now = GETTICKCOUNT(); |
5673d44e |
667 | } while (ret < 0 && errno == EINTR); |
c5e438ec |
668 | |
669 | if (ret < 0) { |
670 | perror("select"); |
671 | exit(1); |
672 | } |
673 | |
0ff9ea38 |
674 | for (i = 0; i < fdcount; i++) { |
675 | fd = fdlist[i]; |
56e5b2db |
676 | /* |
677 | * We must process exceptional notifications before |
678 | * ordinary readability ones, or we may go straight |
679 | * past the urgent marker. |
680 | */ |
0ff9ea38 |
681 | if (FD_ISSET(fd, &xset)) |
682 | select_result(fd, 4); |
683 | if (FD_ISSET(fd, &rset)) |
684 | select_result(fd, 1); |
685 | if (FD_ISSET(fd, &wset)) |
686 | select_result(fd, 2); |
c5e438ec |
687 | } |
688 | |
5673d44e |
689 | if (FD_ISSET(signalpipe[0], &rset)) { |
690 | char c[1]; |
691 | struct winsize size; |
692 | read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */ |
693 | if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0) |
694 | back->size(backhandle, size.ws_col, size.ws_row); |
695 | } |
696 | |
c5e438ec |
697 | if (FD_ISSET(0, &rset)) { |
698 | char buf[4096]; |
699 | int ret; |
700 | |
701 | if (connopen && back->socket(backhandle) != NULL) { |
702 | ret = read(0, buf, sizeof(buf)); |
703 | if (ret < 0) { |
704 | perror("stdin: read"); |
705 | exit(1); |
706 | } else if (ret == 0) { |
707 | back->special(backhandle, TS_EOF); |
708 | sending = FALSE; /* send nothing further after this */ |
709 | } else { |
710 | back->send(backhandle, buf, ret); |
711 | } |
712 | } |
713 | } |
714 | |
715 | if (FD_ISSET(1, &wset)) { |
716 | try_output(0); |
717 | } |
718 | |
719 | if (FD_ISSET(2, &wset)) { |
720 | try_output(1); |
721 | } |
722 | |
723 | if ((!connopen || back->socket(backhandle) == NULL) && |
724 | bufchain_size(&stdout_data) == 0 && |
725 | bufchain_size(&stderr_data) == 0) |
726 | break; /* we closed the connection */ |
727 | } |
728 | exitcode = back->exitcode(backhandle); |
729 | if (exitcode < 0) { |
730 | fprintf(stderr, "Remote process exit code unavailable\n"); |
731 | exitcode = 1; /* this is an error condition */ |
732 | } |
d9c40fd6 |
733 | cleanup_exit(exitcode); |
734 | return exitcode; /* shouldn't happen, but placates gcc */ |
c5e438ec |
735 | } |