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"); |
230 | printf(" -C enable compression\n"); |
231 | printf(" -i key private key file for authentication\n"); |
09bdfcbb |
232 | printf(" -s remote command is an SSH subsystem (SSH-2 only)\n"); |
b72c366d |
233 | printf(" -N don't start a shell/command (SSH-2 only)\n"); |
dc108ebc |
234 | exit(1); |
235 | } |
236 | |
237 | static void version(void) |
238 | { |
239 | printf("plink: %s\n", ver); |
c5e438ec |
240 | exit(1); |
241 | } |
242 | |
243 | int main(int argc, char **argv) |
244 | { |
245 | int sending; |
246 | int portnumber = -1; |
0ff9ea38 |
247 | int *fdlist; |
248 | int fd; |
249 | int i, fdcount, fdsize, fdstate; |
c5e438ec |
250 | int connopen; |
251 | int exitcode; |
86256dc6 |
252 | int errors; |
09bdfcbb |
253 | int use_subsystem = 0; |
b51259f6 |
254 | void *ldisc, *logctx; |
c5e438ec |
255 | |
256 | ssh_get_line = console_get_line; |
257 | |
0ff9ea38 |
258 | fdlist = NULL; |
259 | fdcount = fdsize = 0; |
c5e438ec |
260 | /* |
261 | * Initialise port and protocol to sensible defaults. (These |
262 | * will be overridden by more or less anything.) |
263 | */ |
264 | default_protocol = PROT_SSH; |
265 | default_port = 22; |
266 | |
267 | flags = FLAG_STDERR; |
268 | /* |
269 | * Process the command line. |
270 | */ |
271 | do_defaults(NULL, &cfg); |
18e62ad8 |
272 | loaded_session = FALSE; |
c5e438ec |
273 | default_protocol = cfg.protocol; |
274 | default_port = cfg.port; |
86256dc6 |
275 | errors = 0; |
c5e438ec |
276 | { |
277 | /* |
278 | * Override the default protocol if PLINK_PROTOCOL is set. |
279 | */ |
280 | char *p = getenv("PLINK_PROTOCOL"); |
281 | int i; |
282 | if (p) { |
283 | for (i = 0; backends[i].backend != NULL; i++) { |
284 | if (!strcmp(backends[i].name, p)) { |
285 | default_protocol = cfg.protocol = backends[i].protocol; |
286 | default_port = cfg.port = |
287 | backends[i].backend->default_port; |
288 | break; |
289 | } |
290 | } |
291 | } |
292 | } |
293 | while (--argc) { |
294 | char *p = *++argv; |
295 | if (*p == '-') { |
9b41d3a8 |
296 | int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL), |
297 | 1, &cfg); |
c5e438ec |
298 | if (ret == -2) { |
299 | fprintf(stderr, |
300 | "plink: option \"%s\" requires an argument\n", p); |
86256dc6 |
301 | errors = 1; |
c5e438ec |
302 | } else if (ret == 2) { |
303 | --argc, ++argv; |
304 | } else if (ret == 1) { |
305 | continue; |
306 | } else if (!strcmp(p, "-batch")) { |
307 | console_batch_mode = 1; |
09bdfcbb |
308 | } else if (!strcmp(p, "-s")) { |
309 | /* Save status to write to cfg later. */ |
310 | use_subsystem = 1; |
dc108ebc |
311 | } else if (!strcmp(p, "-V")) { |
312 | version(); |
a0e5ed33 |
313 | } else if (!strcmp(p, "-o")) { |
86256dc6 |
314 | if (argc <= 1) { |
a0e5ed33 |
315 | fprintf(stderr, |
316 | "plink: option \"-o\" requires an argument\n"); |
86256dc6 |
317 | errors = 1; |
318 | } else { |
319 | --argc; |
320 | provide_xrm_string(*++argv); |
321 | } |
322 | } else { |
323 | fprintf(stderr, "plink: unknown option \"%s\"\n", p); |
324 | errors = 1; |
c5e438ec |
325 | } |
326 | } else if (*p) { |
327 | if (!*cfg.host) { |
328 | char *q = p; |
a0e5ed33 |
329 | |
330 | do_defaults(NULL, &cfg); |
331 | |
c5e438ec |
332 | /* |
333 | * If the hostname starts with "telnet:", set the |
334 | * protocol to Telnet and process the string as a |
335 | * Telnet URL. |
336 | */ |
337 | if (!strncmp(q, "telnet:", 7)) { |
338 | char c; |
339 | |
340 | q += 7; |
341 | if (q[0] == '/' && q[1] == '/') |
342 | q += 2; |
343 | cfg.protocol = PROT_TELNET; |
344 | p = q; |
345 | while (*p && *p != ':' && *p != '/') |
346 | p++; |
347 | c = *p; |
348 | if (*p) |
349 | *p++ = '\0'; |
350 | if (c == ':') |
351 | cfg.port = atoi(p); |
352 | else |
353 | cfg.port = -1; |
354 | strncpy(cfg.host, q, sizeof(cfg.host) - 1); |
355 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
356 | } else { |
3608528b |
357 | char *r, *user, *host; |
c5e438ec |
358 | /* |
359 | * Before we process the [user@]host string, we |
360 | * first check for the presence of a protocol |
361 | * prefix (a protocol name followed by ","). |
362 | */ |
363 | r = strchr(p, ','); |
364 | if (r) { |
365 | int i, j; |
366 | for (i = 0; backends[i].backend != NULL; i++) { |
367 | j = strlen(backends[i].name); |
368 | if (j == r - p && |
369 | !memcmp(backends[i].name, p, j)) { |
370 | default_protocol = cfg.protocol = |
371 | backends[i].protocol; |
372 | portnumber = |
373 | backends[i].backend->default_port; |
374 | p = r + 1; |
375 | break; |
376 | } |
377 | } |
378 | } |
379 | |
380 | /* |
3608528b |
381 | * A nonzero length string followed by an @ is treated |
382 | * as a username. (We discount an _initial_ @.) The |
383 | * rest of the string (or the whole string if no @) |
384 | * is treated as a session name and/or hostname. |
c5e438ec |
385 | */ |
386 | r = strrchr(p, '@'); |
387 | if (r == p) |
388 | p++, r = NULL; /* discount initial @ */ |
3608528b |
389 | if (r) { |
390 | *r++ = '\0'; |
391 | user = p, host = r; |
392 | } else { |
393 | user = NULL, host = p; |
394 | } |
395 | |
396 | /* |
397 | * Now attempt to load a saved session with the |
398 | * same name as the hostname. |
399 | */ |
400 | { |
c5e438ec |
401 | Config cfg2; |
3608528b |
402 | do_defaults(host, &cfg2); |
18e62ad8 |
403 | if (loaded_session || cfg2.host[0] == '\0') { |
c5e438ec |
404 | /* No settings for this host; use defaults */ |
18e62ad8 |
405 | /* (or session was already loaded with -load) */ |
3608528b |
406 | strncpy(cfg.host, host, sizeof(cfg.host) - 1); |
c5e438ec |
407 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
408 | cfg.port = default_port; |
409 | } else { |
410 | cfg = cfg2; |
18e62ad8 |
411 | /* Ick: patch up internal pointer after copy */ |
c5e438ec |
412 | cfg.remote_cmd_ptr = cfg.remote_cmd; |
413 | } |
3608528b |
414 | } |
415 | |
416 | if (user) { |
417 | /* Patch in specified username. */ |
418 | strncpy(cfg.username, user, |
419 | sizeof(cfg.username) - 1); |
c5e438ec |
420 | cfg.username[sizeof(cfg.username) - 1] = '\0'; |
c5e438ec |
421 | } |
3608528b |
422 | |
c5e438ec |
423 | } |
424 | } else { |
425 | char *command; |
426 | int cmdlen, cmdsize; |
427 | cmdlen = cmdsize = 0; |
428 | command = NULL; |
429 | |
430 | while (argc) { |
431 | while (*p) { |
432 | if (cmdlen >= cmdsize) { |
433 | cmdsize = cmdlen + 512; |
3d88e64d |
434 | command = sresize(command, cmdsize, char); |
c5e438ec |
435 | } |
436 | command[cmdlen++]=*p++; |
437 | } |
438 | if (cmdlen >= cmdsize) { |
439 | cmdsize = cmdlen + 512; |
3d88e64d |
440 | command = sresize(command, cmdsize, char); |
c5e438ec |
441 | } |
442 | command[cmdlen++]=' '; /* always add trailing space */ |
443 | if (--argc) p = *++argv; |
444 | } |
445 | if (cmdlen) command[--cmdlen]='\0'; |
446 | /* change trailing blank to NUL */ |
447 | cfg.remote_cmd_ptr = command; |
448 | cfg.remote_cmd_ptr2 = NULL; |
449 | cfg.nopty = TRUE; /* command => no terminal */ |
450 | |
451 | break; /* done with cmdline */ |
452 | } |
453 | } |
454 | } |
455 | |
86256dc6 |
456 | if (errors) |
457 | return 1; |
458 | |
c5e438ec |
459 | if (!*cfg.host) { |
460 | usage(); |
461 | } |
462 | |
463 | /* |
464 | * Trim leading whitespace off the hostname if it's there. |
465 | */ |
466 | { |
467 | int space = strspn(cfg.host, " \t"); |
468 | memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space); |
469 | } |
470 | |
471 | /* See if host is of the form user@host */ |
472 | if (cfg.host[0] != '\0') { |
5dd103a8 |
473 | char *atsign = strrchr(cfg.host, '@'); |
c5e438ec |
474 | /* Make sure we're not overflowing the user field */ |
475 | if (atsign) { |
476 | if (atsign - cfg.host < sizeof cfg.username) { |
477 | strncpy(cfg.username, cfg.host, atsign - cfg.host); |
478 | cfg.username[atsign - cfg.host] = '\0'; |
479 | } |
480 | memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1)); |
481 | } |
482 | } |
483 | |
484 | /* |
485 | * Perform command-line overrides on session configuration. |
486 | */ |
9b41d3a8 |
487 | cmdline_run_saved(&cfg); |
c5e438ec |
488 | |
489 | /* |
09bdfcbb |
490 | * Apply subsystem status. |
491 | */ |
492 | if (use_subsystem) |
493 | cfg.ssh_subsys = TRUE; |
494 | |
495 | /* |
c5e438ec |
496 | * Trim a colon suffix off the hostname if it's there. |
497 | */ |
498 | cfg.host[strcspn(cfg.host, ":")] = '\0'; |
499 | |
500 | /* |
501 | * Remove any remaining whitespace from the hostname. |
502 | */ |
503 | { |
504 | int p1 = 0, p2 = 0; |
505 | while (cfg.host[p2] != '\0') { |
506 | if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') { |
507 | cfg.host[p1] = cfg.host[p2]; |
508 | p1++; |
509 | } |
510 | p2++; |
511 | } |
512 | cfg.host[p1] = '\0'; |
513 | } |
514 | |
515 | if (!*cfg.remote_cmd_ptr) |
516 | flags |= FLAG_INTERACTIVE; |
517 | |
518 | /* |
519 | * Select protocol. This is farmed out into a table in a |
520 | * separate file to enable an ssh-free variant. |
521 | */ |
522 | { |
523 | int i; |
524 | back = NULL; |
525 | for (i = 0; backends[i].backend != NULL; i++) |
526 | if (backends[i].protocol == cfg.protocol) { |
527 | back = backends[i].backend; |
528 | break; |
529 | } |
530 | if (back == NULL) { |
531 | fprintf(stderr, |
532 | "Internal fault: Unsupported protocol found\n"); |
533 | return 1; |
534 | } |
535 | } |
536 | |
537 | /* |
538 | * Select port. |
539 | */ |
540 | if (portnumber != -1) |
541 | cfg.port = portnumber; |
542 | |
5673d44e |
543 | /* |
544 | * Set up the pipe we'll use to tell us about SIGWINCH. |
545 | */ |
546 | if (pipe(signalpipe) < 0) { |
547 | perror("pipe"); |
548 | exit(1); |
549 | } |
550 | putty_signal(SIGWINCH, sigwinch); |
551 | |
c5e438ec |
552 | sk_init(); |
0ff9ea38 |
553 | uxsel_init(); |
c5e438ec |
554 | |
555 | /* |
556 | * Start up the connection. |
557 | */ |
c229ef97 |
558 | logctx = log_init(NULL, &cfg); |
b51259f6 |
559 | console_provide_logctx(logctx); |
c5e438ec |
560 | { |
cbe2d68f |
561 | const char *error; |
c5e438ec |
562 | char *realhost; |
563 | /* nodelay is only useful if stdin is a terminal device */ |
564 | int nodelay = cfg.tcp_nodelay && isatty(0); |
565 | |
86916870 |
566 | error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port, |
79bf227b |
567 | &realhost, nodelay, cfg.tcp_keepalives); |
c5e438ec |
568 | if (error) { |
984992ef |
569 | fprintf(stderr, "Unable to open connection:\n%s\n", error); |
c5e438ec |
570 | return 1; |
571 | } |
c5e438ec |
572 | back->provide_logctx(backhandle, logctx); |
fe5634f6 |
573 | ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL); |
c5e438ec |
574 | sfree(realhost); |
575 | } |
576 | connopen = 1; |
577 | |
578 | /* |
579 | * Set up the initial console mode. We don't care if this call |
580 | * fails, because we know we aren't necessarily running in a |
581 | * console. |
582 | */ |
583 | tcgetattr(0, &orig_termios); |
584 | atexit(cleanup_termios); |
585 | ldisc_update(NULL, 1, 1); |
586 | sending = FALSE; |
587 | |
588 | while (1) { |
589 | fd_set rset, wset, xset; |
590 | int maxfd; |
591 | int rwx; |
592 | int ret; |
593 | |
594 | FD_ZERO(&rset); |
595 | FD_ZERO(&wset); |
596 | FD_ZERO(&xset); |
597 | maxfd = 0; |
598 | |
5673d44e |
599 | FD_SET_MAX(signalpipe[0], maxfd, rset); |
600 | |
c5e438ec |
601 | if (connopen && !sending && |
602 | back->socket(backhandle) != NULL && |
603 | back->sendok(backhandle) && |
604 | back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) { |
605 | /* If we're OK to send, then try to read from stdin. */ |
606 | FD_SET_MAX(0, maxfd, rset); |
607 | } |
608 | |
609 | if (bufchain_size(&stdout_data) > 0) { |
610 | /* If we have data for stdout, try to write to stdout. */ |
611 | FD_SET_MAX(1, maxfd, wset); |
612 | } |
613 | |
614 | if (bufchain_size(&stderr_data) > 0) { |
615 | /* If we have data for stderr, try to write to stderr. */ |
616 | FD_SET_MAX(2, maxfd, wset); |
617 | } |
618 | |
0ff9ea38 |
619 | /* Count the currently active fds. */ |
c5e438ec |
620 | i = 0; |
0ff9ea38 |
621 | for (fd = first_fd(&fdstate, &rwx); fd >= 0; |
622 | fd = next_fd(&fdstate, &rwx)) i++; |
c5e438ec |
623 | |
0ff9ea38 |
624 | /* Expand the fdlist buffer if necessary. */ |
625 | if (i > fdsize) { |
626 | fdsize = i + 16; |
627 | fdlist = sresize(fdlist, fdsize, int); |
c5e438ec |
628 | } |
629 | |
630 | /* |
0ff9ea38 |
631 | * Add all currently open fds to the select sets, and store |
632 | * them in fdlist as well. |
c5e438ec |
633 | */ |
0ff9ea38 |
634 | fdcount = 0; |
635 | for (fd = first_fd(&fdstate, &rwx); fd >= 0; |
636 | fd = next_fd(&fdstate, &rwx)) { |
637 | fdlist[fdcount++] = fd; |
c5e438ec |
638 | if (rwx & 1) |
0ff9ea38 |
639 | FD_SET_MAX(fd, maxfd, rset); |
c5e438ec |
640 | if (rwx & 2) |
0ff9ea38 |
641 | FD_SET_MAX(fd, maxfd, wset); |
c5e438ec |
642 | if (rwx & 4) |
0ff9ea38 |
643 | FD_SET_MAX(fd, maxfd, xset); |
c5e438ec |
644 | } |
645 | |
5673d44e |
646 | do { |
647 | ret = select(maxfd, &rset, &wset, &xset, NULL); |
648 | } while (ret < 0 && errno == EINTR); |
c5e438ec |
649 | |
650 | if (ret < 0) { |
651 | perror("select"); |
652 | exit(1); |
653 | } |
654 | |
0ff9ea38 |
655 | for (i = 0; i < fdcount; i++) { |
656 | fd = fdlist[i]; |
56e5b2db |
657 | /* |
658 | * We must process exceptional notifications before |
659 | * ordinary readability ones, or we may go straight |
660 | * past the urgent marker. |
661 | */ |
0ff9ea38 |
662 | if (FD_ISSET(fd, &xset)) |
663 | select_result(fd, 4); |
664 | if (FD_ISSET(fd, &rset)) |
665 | select_result(fd, 1); |
666 | if (FD_ISSET(fd, &wset)) |
667 | select_result(fd, 2); |
c5e438ec |
668 | } |
669 | |
5673d44e |
670 | if (FD_ISSET(signalpipe[0], &rset)) { |
671 | char c[1]; |
672 | struct winsize size; |
673 | read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */ |
674 | if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0) |
675 | back->size(backhandle, size.ws_col, size.ws_row); |
676 | } |
677 | |
c5e438ec |
678 | if (FD_ISSET(0, &rset)) { |
679 | char buf[4096]; |
680 | int ret; |
681 | |
682 | if (connopen && back->socket(backhandle) != NULL) { |
683 | ret = read(0, buf, sizeof(buf)); |
684 | if (ret < 0) { |
685 | perror("stdin: read"); |
686 | exit(1); |
687 | } else if (ret == 0) { |
688 | back->special(backhandle, TS_EOF); |
689 | sending = FALSE; /* send nothing further after this */ |
690 | } else { |
691 | back->send(backhandle, buf, ret); |
692 | } |
693 | } |
694 | } |
695 | |
696 | if (FD_ISSET(1, &wset)) { |
697 | try_output(0); |
698 | } |
699 | |
700 | if (FD_ISSET(2, &wset)) { |
701 | try_output(1); |
702 | } |
703 | |
704 | if ((!connopen || back->socket(backhandle) == NULL) && |
705 | bufchain_size(&stdout_data) == 0 && |
706 | bufchain_size(&stderr_data) == 0) |
707 | break; /* we closed the connection */ |
708 | } |
709 | exitcode = back->exitcode(backhandle); |
710 | if (exitcode < 0) { |
711 | fprintf(stderr, "Remote process exit code unavailable\n"); |
712 | exitcode = 1; /* this is an error condition */ |
713 | } |
d9c40fd6 |
714 | cleanup_exit(exitcode); |
715 | return exitcode; /* shouldn't happen, but placates gcc */ |
c5e438ec |
716 | } |