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 | { |
76 | if (!strcmp(name, "X11Display")) |
799dfcfa |
77 | return dupstr(getenv("DISPLAY")); |
5a9eb105 |
78 | if (!strcmp(name, "TermType")) |
799dfcfa |
79 | return dupstr(getenv("TERM")); |
80 | if (!strcmp(name, "UserName")) |
81 | return get_username(); |
5a9eb105 |
82 | return NULL; |
83 | } |
84 | |
c85623f9 |
85 | int platform_default_i(const char *name, int def) |
5a9eb105 |
86 | { |
87 | if (!strcmp(name, "TermWidth") || |
88 | !strcmp(name, "TermHeight")) { |
89 | struct winsize size; |
90 | if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0) |
91 | return (!strcmp(name, "TermWidth") ? size.ws_col : size.ws_row); |
92 | } |
93 | return def; |
94 | } |
95 | |
9a30e26b |
96 | FontSpec platform_default_fontspec(const char *name) |
97 | { |
98 | FontSpec ret; |
99 | *ret.name = '\0'; |
100 | return ret; |
101 | } |
102 | |
103 | Filename platform_default_filename(const char *name) |
104 | { |
105 | Filename ret; |
106 | if (!strcmp(name, "LogFileName")) |
107 | strcpy(ret.path, "putty.log"); |
108 | else |
109 | *ret.path = '\0'; |
110 | return ret; |
111 | } |
112 | |
c85623f9 |
113 | char *x_get_default(const char *key) |
c5e438ec |
114 | { |
115 | return NULL; /* this is a stub */ |
116 | } |
117 | int term_ldisc(Terminal *term, int mode) |
118 | { |
119 | return FALSE; |
120 | } |
121 | void ldisc_update(void *frontend, int echo, int edit) |
122 | { |
123 | /* Update stdin read mode to reflect changes in line discipline. */ |
124 | struct termios mode; |
125 | |
126 | mode = orig_termios; |
127 | |
128 | if (echo) |
129 | mode.c_lflag |= ECHO; |
130 | else |
131 | mode.c_lflag &= ~ECHO; |
132 | |
133 | if (edit) |
134 | mode.c_lflag |= ISIG | ICANON; |
135 | else |
136 | mode.c_lflag &= ~(ISIG | ICANON); |
137 | |
138 | tcsetattr(0, TCSANOW, &mode); |
139 | } |
140 | |
141 | void cleanup_termios(void) |
142 | { |
143 | tcsetattr(0, TCSANOW, &orig_termios); |
144 | } |
145 | |
146 | bufchain stdout_data, stderr_data; |
147 | |
148 | void try_output(int is_stderr) |
149 | { |
150 | bufchain *chain = (is_stderr ? &stderr_data : &stdout_data); |
151 | int fd = (is_stderr ? 2 : 1); |
152 | void *senddata; |
153 | int sendlen, ret; |
154 | |
d69a46c0 |
155 | if (bufchain_size(chain) == 0) |
156 | return; |
157 | |
c5e438ec |
158 | bufchain_prefix(chain, &senddata, &sendlen); |
159 | ret = write(fd, senddata, sendlen); |
160 | if (ret > 0) |
161 | bufchain_consume(chain, ret); |
162 | else if (ret < 0) { |
163 | perror(is_stderr ? "stderr: write" : "stdout: write"); |
164 | exit(1); |
165 | } |
166 | } |
167 | |
9fab77dc |
168 | int from_backend(void *frontend_handle, int is_stderr, |
169 | const char *data, int len) |
c5e438ec |
170 | { |
171 | int osize, esize; |
172 | |
c5e438ec |
173 | if (is_stderr) { |
174 | bufchain_add(&stderr_data, data, len); |
175 | try_output(1); |
176 | } else { |
177 | bufchain_add(&stdout_data, data, len); |
178 | try_output(0); |
179 | } |
180 | |
181 | osize = bufchain_size(&stdout_data); |
182 | esize = bufchain_size(&stderr_data); |
183 | |
184 | return osize + esize; |
185 | } |
186 | |
5673d44e |
187 | int signalpipe[2]; |
188 | |
189 | void sigwinch(int signum) |
190 | { |
191 | write(signalpipe[1], "x", 1); |
192 | } |
193 | |
c5e438ec |
194 | /* |
74aca06d |
195 | * In Plink our selects are synchronous, so these functions are |
196 | * empty stubs. |
197 | */ |
198 | int uxsel_input_add(int fd, int rwx) { return 0; } |
199 | void uxsel_input_remove(int id) { } |
200 | |
201 | /* |
c5e438ec |
202 | * Short description of parameters. |
203 | */ |
204 | static void usage(void) |
205 | { |
206 | printf("PuTTY Link: command-line connection utility\n"); |
207 | printf("%s\n", ver); |
208 | printf("Usage: plink [options] [user@]host [command]\n"); |
209 | printf(" (\"host\" can also be a PuTTY saved session name)\n"); |
210 | printf("Options:\n"); |
c9a13be6 |
211 | printf(" -V print version information\n"); |
c5e438ec |
212 | printf(" -v show verbose messages\n"); |
213 | printf(" -load sessname Load settings from saved session\n"); |
214 | printf(" -ssh -telnet -rlogin -raw\n"); |
215 | printf(" force use of a particular protocol (default SSH)\n"); |
216 | printf(" -P port connect to specified port\n"); |
217 | printf(" -l user connect with specified username\n"); |
218 | printf(" -m file read remote command(s) from file\n"); |
219 | printf(" -batch disable all interactive prompts\n"); |
220 | printf("The following options only apply to SSH connections:\n"); |
221 | printf(" -pw passw login with specified password\n"); |
dbe6c525 |
222 | printf(" -D [listen-IP:]listen-port\n"); |
223 | printf(" Dynamic SOCKS-based port forwarding\n"); |
224 | printf(" -L [listen-IP:]listen-port:host:port\n"); |
225 | printf(" Forward local port to remote address\n"); |
226 | printf(" -R [listen-IP:]listen-port:host:port\n"); |
227 | printf(" Forward remote port to local address\n"); |
c5e438ec |
228 | printf(" -X -x enable / disable X11 forwarding\n"); |
229 | printf(" -A -a enable / disable agent forwarding\n"); |
230 | printf(" -t -T enable / disable pty allocation\n"); |
231 | printf(" -1 -2 force use of particular protocol version\n"); |
232 | printf(" -C enable compression\n"); |
233 | printf(" -i key private key file for authentication\n"); |
09bdfcbb |
234 | printf(" -s remote command is an SSH subsystem (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; |
c5e438ec |
256 | |
257 | ssh_get_line = console_get_line; |
258 | |
0ff9ea38 |
259 | fdlist = NULL; |
260 | fdcount = fdsize = 0; |
c5e438ec |
261 | /* |
262 | * Initialise port and protocol to sensible defaults. (These |
263 | * will be overridden by more or less anything.) |
264 | */ |
265 | default_protocol = PROT_SSH; |
266 | default_port = 22; |
267 | |
268 | flags = FLAG_STDERR; |
269 | /* |
270 | * Process the command line. |
271 | */ |
272 | do_defaults(NULL, &cfg); |
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 { |
357 | char *r; |
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 | /* |
381 | * Three cases. Either (a) there's a nonzero |
382 | * length string followed by an @, in which |
383 | * case that's user and the remainder is host. |
384 | * Or (b) there's only one string, not counting |
385 | * a potential initial @, and it exists in the |
386 | * saved-sessions database. Or (c) only one |
387 | * string and it _doesn't_ exist in the |
388 | * database. |
389 | */ |
390 | r = strrchr(p, '@'); |
391 | if (r == p) |
392 | p++, r = NULL; /* discount initial @ */ |
393 | if (r == NULL) { |
394 | /* |
395 | * One string. |
396 | */ |
397 | Config cfg2; |
398 | do_defaults(p, &cfg2); |
399 | if (cfg2.host[0] == '\0') { |
400 | /* No settings for this host; use defaults */ |
401 | strncpy(cfg.host, p, sizeof(cfg.host) - 1); |
402 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
403 | cfg.port = default_port; |
404 | } else { |
405 | cfg = cfg2; |
406 | cfg.remote_cmd_ptr = cfg.remote_cmd; |
407 | } |
408 | } else { |
409 | *r++ = '\0'; |
410 | strncpy(cfg.username, p, sizeof(cfg.username) - 1); |
411 | cfg.username[sizeof(cfg.username) - 1] = '\0'; |
412 | strncpy(cfg.host, r, sizeof(cfg.host) - 1); |
413 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
414 | cfg.port = default_port; |
415 | } |
416 | } |
417 | } else { |
418 | char *command; |
419 | int cmdlen, cmdsize; |
420 | cmdlen = cmdsize = 0; |
421 | command = NULL; |
422 | |
423 | while (argc) { |
424 | while (*p) { |
425 | if (cmdlen >= cmdsize) { |
426 | cmdsize = cmdlen + 512; |
3d88e64d |
427 | command = sresize(command, cmdsize, char); |
c5e438ec |
428 | } |
429 | command[cmdlen++]=*p++; |
430 | } |
431 | if (cmdlen >= cmdsize) { |
432 | cmdsize = cmdlen + 512; |
3d88e64d |
433 | command = sresize(command, cmdsize, char); |
c5e438ec |
434 | } |
435 | command[cmdlen++]=' '; /* always add trailing space */ |
436 | if (--argc) p = *++argv; |
437 | } |
438 | if (cmdlen) command[--cmdlen]='\0'; |
439 | /* change trailing blank to NUL */ |
440 | cfg.remote_cmd_ptr = command; |
441 | cfg.remote_cmd_ptr2 = NULL; |
442 | cfg.nopty = TRUE; /* command => no terminal */ |
443 | |
444 | break; /* done with cmdline */ |
445 | } |
446 | } |
447 | } |
448 | |
86256dc6 |
449 | if (errors) |
450 | return 1; |
451 | |
c5e438ec |
452 | if (!*cfg.host) { |
453 | usage(); |
454 | } |
455 | |
456 | /* |
457 | * Trim leading whitespace off the hostname if it's there. |
458 | */ |
459 | { |
460 | int space = strspn(cfg.host, " \t"); |
461 | memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space); |
462 | } |
463 | |
464 | /* See if host is of the form user@host */ |
465 | if (cfg.host[0] != '\0') { |
466 | char *atsign = strchr(cfg.host, '@'); |
467 | /* Make sure we're not overflowing the user field */ |
468 | if (atsign) { |
469 | if (atsign - cfg.host < sizeof cfg.username) { |
470 | strncpy(cfg.username, cfg.host, atsign - cfg.host); |
471 | cfg.username[atsign - cfg.host] = '\0'; |
472 | } |
473 | memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1)); |
474 | } |
475 | } |
476 | |
477 | /* |
478 | * Perform command-line overrides on session configuration. |
479 | */ |
9b41d3a8 |
480 | cmdline_run_saved(&cfg); |
c5e438ec |
481 | |
482 | /* |
09bdfcbb |
483 | * Apply subsystem status. |
484 | */ |
485 | if (use_subsystem) |
486 | cfg.ssh_subsys = TRUE; |
487 | |
488 | /* |
c5e438ec |
489 | * Trim a colon suffix off the hostname if it's there. |
490 | */ |
491 | cfg.host[strcspn(cfg.host, ":")] = '\0'; |
492 | |
493 | /* |
494 | * Remove any remaining whitespace from the hostname. |
495 | */ |
496 | { |
497 | int p1 = 0, p2 = 0; |
498 | while (cfg.host[p2] != '\0') { |
499 | if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') { |
500 | cfg.host[p1] = cfg.host[p2]; |
501 | p1++; |
502 | } |
503 | p2++; |
504 | } |
505 | cfg.host[p1] = '\0'; |
506 | } |
507 | |
508 | if (!*cfg.remote_cmd_ptr) |
509 | flags |= FLAG_INTERACTIVE; |
510 | |
511 | /* |
512 | * Select protocol. This is farmed out into a table in a |
513 | * separate file to enable an ssh-free variant. |
514 | */ |
515 | { |
516 | int i; |
517 | back = NULL; |
518 | for (i = 0; backends[i].backend != NULL; i++) |
519 | if (backends[i].protocol == cfg.protocol) { |
520 | back = backends[i].backend; |
521 | break; |
522 | } |
523 | if (back == NULL) { |
524 | fprintf(stderr, |
525 | "Internal fault: Unsupported protocol found\n"); |
526 | return 1; |
527 | } |
528 | } |
529 | |
530 | /* |
531 | * Select port. |
532 | */ |
533 | if (portnumber != -1) |
534 | cfg.port = portnumber; |
535 | |
5673d44e |
536 | /* |
537 | * Set up the pipe we'll use to tell us about SIGWINCH. |
538 | */ |
539 | if (pipe(signalpipe) < 0) { |
540 | perror("pipe"); |
541 | exit(1); |
542 | } |
543 | putty_signal(SIGWINCH, sigwinch); |
544 | |
c5e438ec |
545 | sk_init(); |
0ff9ea38 |
546 | uxsel_init(); |
c5e438ec |
547 | |
548 | /* |
549 | * Start up the connection. |
550 | */ |
c229ef97 |
551 | logctx = log_init(NULL, &cfg); |
b51259f6 |
552 | console_provide_logctx(logctx); |
c5e438ec |
553 | { |
cbe2d68f |
554 | const char *error; |
c5e438ec |
555 | char *realhost; |
556 | /* nodelay is only useful if stdin is a terminal device */ |
557 | int nodelay = cfg.tcp_nodelay && isatty(0); |
558 | |
86916870 |
559 | error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port, |
c5e438ec |
560 | &realhost, nodelay); |
561 | if (error) { |
984992ef |
562 | fprintf(stderr, "Unable to open connection:\n%s\n", error); |
c5e438ec |
563 | return 1; |
564 | } |
c5e438ec |
565 | back->provide_logctx(backhandle, logctx); |
fe5634f6 |
566 | ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL); |
c5e438ec |
567 | sfree(realhost); |
568 | } |
569 | connopen = 1; |
570 | |
571 | /* |
572 | * Set up the initial console mode. We don't care if this call |
573 | * fails, because we know we aren't necessarily running in a |
574 | * console. |
575 | */ |
576 | tcgetattr(0, &orig_termios); |
577 | atexit(cleanup_termios); |
578 | ldisc_update(NULL, 1, 1); |
579 | sending = FALSE; |
580 | |
581 | while (1) { |
582 | fd_set rset, wset, xset; |
583 | int maxfd; |
584 | int rwx; |
585 | int ret; |
586 | |
587 | FD_ZERO(&rset); |
588 | FD_ZERO(&wset); |
589 | FD_ZERO(&xset); |
590 | maxfd = 0; |
591 | |
5673d44e |
592 | FD_SET_MAX(signalpipe[0], maxfd, rset); |
593 | |
c5e438ec |
594 | if (connopen && !sending && |
595 | back->socket(backhandle) != NULL && |
596 | back->sendok(backhandle) && |
597 | back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) { |
598 | /* If we're OK to send, then try to read from stdin. */ |
599 | FD_SET_MAX(0, maxfd, rset); |
600 | } |
601 | |
602 | if (bufchain_size(&stdout_data) > 0) { |
603 | /* If we have data for stdout, try to write to stdout. */ |
604 | FD_SET_MAX(1, maxfd, wset); |
605 | } |
606 | |
607 | if (bufchain_size(&stderr_data) > 0) { |
608 | /* If we have data for stderr, try to write to stderr. */ |
609 | FD_SET_MAX(2, maxfd, wset); |
610 | } |
611 | |
0ff9ea38 |
612 | /* Count the currently active fds. */ |
c5e438ec |
613 | i = 0; |
0ff9ea38 |
614 | for (fd = first_fd(&fdstate, &rwx); fd >= 0; |
615 | fd = next_fd(&fdstate, &rwx)) i++; |
c5e438ec |
616 | |
0ff9ea38 |
617 | /* Expand the fdlist buffer if necessary. */ |
618 | if (i > fdsize) { |
619 | fdsize = i + 16; |
620 | fdlist = sresize(fdlist, fdsize, int); |
c5e438ec |
621 | } |
622 | |
623 | /* |
0ff9ea38 |
624 | * Add all currently open fds to the select sets, and store |
625 | * them in fdlist as well. |
c5e438ec |
626 | */ |
0ff9ea38 |
627 | fdcount = 0; |
628 | for (fd = first_fd(&fdstate, &rwx); fd >= 0; |
629 | fd = next_fd(&fdstate, &rwx)) { |
630 | fdlist[fdcount++] = fd; |
c5e438ec |
631 | if (rwx & 1) |
0ff9ea38 |
632 | FD_SET_MAX(fd, maxfd, rset); |
c5e438ec |
633 | if (rwx & 2) |
0ff9ea38 |
634 | FD_SET_MAX(fd, maxfd, wset); |
c5e438ec |
635 | if (rwx & 4) |
0ff9ea38 |
636 | FD_SET_MAX(fd, maxfd, xset); |
c5e438ec |
637 | } |
638 | |
5673d44e |
639 | do { |
640 | ret = select(maxfd, &rset, &wset, &xset, NULL); |
641 | } while (ret < 0 && errno == EINTR); |
c5e438ec |
642 | |
643 | if (ret < 0) { |
644 | perror("select"); |
645 | exit(1); |
646 | } |
647 | |
0ff9ea38 |
648 | for (i = 0; i < fdcount; i++) { |
649 | fd = fdlist[i]; |
56e5b2db |
650 | /* |
651 | * We must process exceptional notifications before |
652 | * ordinary readability ones, or we may go straight |
653 | * past the urgent marker. |
654 | */ |
0ff9ea38 |
655 | if (FD_ISSET(fd, &xset)) |
656 | select_result(fd, 4); |
657 | if (FD_ISSET(fd, &rset)) |
658 | select_result(fd, 1); |
659 | if (FD_ISSET(fd, &wset)) |
660 | select_result(fd, 2); |
c5e438ec |
661 | } |
662 | |
5673d44e |
663 | if (FD_ISSET(signalpipe[0], &rset)) { |
664 | char c[1]; |
665 | struct winsize size; |
666 | read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */ |
667 | if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0) |
668 | back->size(backhandle, size.ws_col, size.ws_row); |
669 | } |
670 | |
c5e438ec |
671 | if (FD_ISSET(0, &rset)) { |
672 | char buf[4096]; |
673 | int ret; |
674 | |
675 | if (connopen && back->socket(backhandle) != NULL) { |
676 | ret = read(0, buf, sizeof(buf)); |
677 | if (ret < 0) { |
678 | perror("stdin: read"); |
679 | exit(1); |
680 | } else if (ret == 0) { |
681 | back->special(backhandle, TS_EOF); |
682 | sending = FALSE; /* send nothing further after this */ |
683 | } else { |
684 | back->send(backhandle, buf, ret); |
685 | } |
686 | } |
687 | } |
688 | |
689 | if (FD_ISSET(1, &wset)) { |
690 | try_output(0); |
691 | } |
692 | |
693 | if (FD_ISSET(2, &wset)) { |
694 | try_output(1); |
695 | } |
696 | |
697 | if ((!connopen || back->socket(backhandle) == NULL) && |
698 | bufchain_size(&stdout_data) == 0 && |
699 | bufchain_size(&stderr_data) == 0) |
700 | break; /* we closed the connection */ |
701 | } |
702 | exitcode = back->exitcode(backhandle); |
703 | if (exitcode < 0) { |
704 | fprintf(stderr, "Remote process exit code unavailable\n"); |
705 | exitcode = 1; /* this is an error condition */ |
706 | } |
d9c40fd6 |
707 | cleanup_exit(exitcode); |
708 | return exitcode; /* shouldn't happen, but placates gcc */ |
c5e438ec |
709 | } |