1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1997 Brian Somers <[email protected]>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/types.h>
33
34 #include <sys/socket.h>
35 #include <netinet/in.h>
36 #include <arpa/inet.h>
37 #include <sys/un.h>
38 #include <netdb.h>
39
40 #include <sys/time.h>
41 #include <err.h>
42 #include <errno.h>
43 #include <histedit.h>
44 #include <semaphore.h>
45 #include <pthread.h>
46 #include <setjmp.h>
47 #include <signal.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <time.h>
52 #include <unistd.h>
53
54 #define LINELEN 2048
55
56 /* Data passed to the threads we create */
57 struct thread_data {
58 EditLine *edit; /* libedit stuff */
59 History *hist; /* libedit stuff */
60 pthread_t trm; /* Terminal thread (for pthread_kill()) */
61 int ppp; /* ppp descriptor */
62 };
63
64 /* Flags passed to Receive() */
65 #define REC_PASSWD (1) /* Handle a password request from ppp */
66 #define REC_SHOW (2) /* Show everything except prompts */
67 #define REC_VERBOSE (4) /* Show everything */
68
69 static char *passwd;
70 static char *prompt; /* Tell libedit what the current prompt is */
71 static int data = -1; /* setjmp() has been done when data != -1 */
72 static jmp_buf pppdead; /* Jump the Terminal thread out of el_gets() */
73 static int timetogo; /* Tell the Monitor thread to exit */
74 static sem_t sem_select; /* select() co-ordination between threads */
75 static int TimedOut; /* Set if our connect() timed out */
76 static int want_sem_post; /* Need to let the Monitor thread in ? */
77
78 /*
79 * How to use pppctl...
80 */
81 static int
usage()82 usage()
83 {
84 fprintf(stderr, "usage: pppctl [-v] [-t n] [-p passwd] "
85 "Port|LocalSock [command[;command]...]\n");
86 fprintf(stderr, " -v tells pppctl to output all"
87 " conversation\n");
88 fprintf(stderr, " -t n specifies a timeout of n"
89 " seconds when connecting (default 2)\n");
90 fprintf(stderr, " -p passwd specifies your password\n");
91 exit(1);
92 }
93
94 /*
95 * Handle the SIGALRM received due to a connect() timeout.
96 */
97 static void
Timeout(int Sig)98 Timeout(int Sig)
99 {
100 TimedOut = 1;
101 }
102
103 /*
104 * A callback routine for libedit to find out what the current prompt is.
105 * All the work is done in Receive() below.
106 */
107 static char *
GetPrompt(EditLine * e)108 GetPrompt(EditLine *e)
109 {
110 if (prompt == NULL)
111 prompt = "";
112 return prompt;
113 }
114
115 /*
116 * Receive data from the ppp descriptor.
117 * We also handle password prompts here (if asked via the `display' arg)
118 * and buffer what our prompt looks like (via the `prompt' global).
119 */
120 static int
Receive(int fd,int display)121 Receive(int fd, int display)
122 {
123 static char Buffer[LINELEN];
124 char temp[sizeof(Buffer)];
125 struct timeval t;
126 int Result;
127 char *last;
128 fd_set f;
129 int len;
130 int err;
131
132 FD_ZERO(&f);
133 FD_SET(fd, &f);
134 t.tv_sec = 0;
135 t.tv_usec = 100000;
136 prompt = Buffer;
137 len = 0;
138
139 while (Result = read(fd, Buffer+len, sizeof(Buffer)-len-1), Result != -1) {
140 if (Result == 0) {
141 Result = -1;
142 break;
143 }
144 len += Result;
145 Buffer[len] = '\0';
146 if (len > 2 && !strcmp(Buffer+len-2, "> ")) {
147 prompt = strrchr(Buffer, '\n');
148 if (display & (REC_SHOW|REC_VERBOSE)) {
149 if (display & REC_VERBOSE)
150 last = Buffer+len-1;
151 else
152 last = prompt;
153 if (last) {
154 last++;
155 write(STDOUT_FILENO, Buffer, last-Buffer);
156 }
157 }
158 prompt = prompt == NULL ? Buffer : prompt+1;
159 for (last = Buffer+len-2; last > Buffer && *last != ' '; last--)
160 ;
161 if (last > Buffer+3 && !strncmp(last-3, " on", 3)) {
162 /* a password is required ! */
163 if (display & REC_PASSWD) {
164 /* password time */
165 if (!passwd)
166 passwd = getpass("Password: ");
167 sprintf(Buffer, "passwd %s\n", passwd);
168 memset(passwd, '\0', strlen(passwd));
169 if (display & REC_VERBOSE)
170 write(STDOUT_FILENO, Buffer, strlen(Buffer));
171 write(fd, Buffer, strlen(Buffer));
172 memset(Buffer, '\0', strlen(Buffer));
173 return Receive(fd, display & ~REC_PASSWD);
174 }
175 Result = 1;
176 } else
177 Result = 0;
178 break;
179 } else
180 prompt = "";
181 if (len == sizeof Buffer - 1) {
182 int flush;
183 if ((last = strrchr(Buffer, '\n')) == NULL)
184 /* Yeuch - this is one mother of a line ! */
185 flush = sizeof Buffer / 2;
186 else
187 flush = last - Buffer + 1;
188 write(STDOUT_FILENO, Buffer, flush);
189 strcpy(temp, Buffer + flush);
190 strcpy(Buffer, temp);
191 len -= flush;
192 }
193 if ((Result = select(fd + 1, &f, NULL, NULL, &t)) <= 0) {
194 err = Result == -1 ? errno : 0;
195 if (len)
196 write(STDOUT_FILENO, Buffer, len);
197 if (err == EINTR)
198 continue;
199 break;
200 }
201 }
202
203 return Result;
204 }
205
206 /*
207 * Handle being told by the Monitor thread that there's data to be read
208 * on the ppp descriptor.
209 *
210 * Note, this is a signal handler - be careful of what we do !
211 */
212 static void
InputHandler(int sig)213 InputHandler(int sig)
214 {
215 static char buf[LINELEN];
216 struct timeval t;
217 int len;
218 fd_set f;
219
220 if (data != -1) {
221 FD_ZERO(&f);
222 FD_SET(data, &f);
223 t.tv_sec = t.tv_usec = 0;
224
225 if (select(data + 1, &f, NULL, NULL, &t) > 0) {
226 len = read(data, buf, sizeof buf);
227
228 if (len > 0)
229 write(STDOUT_FILENO, buf, len);
230 else if (data != -1)
231 longjmp(pppdead, -1);
232 }
233
234 sem_post(&sem_select);
235 } else
236 /* Don't let the Monitor thread in 'till we've set ``data'' up again */
237 want_sem_post = 1;
238 }
239
240 /*
241 * This is a simple wrapper for el_gets(), allowing our SIGUSR1 signal
242 * handler (above) to take effect only after we've done a setjmp().
243 *
244 * We don't want it to do anything outside of here as we're going to
245 * service the ppp descriptor anyway.
246 */
247 static const char *
SmartGets(EditLine * e,int * count,int fd)248 SmartGets(EditLine *e, int *count, int fd)
249 {
250 const char *result;
251
252 if (setjmp(pppdead))
253 result = NULL;
254 else {
255 data = fd;
256 if (want_sem_post)
257 /* Let the Monitor thread in again */
258 sem_post(&sem_select);
259 result = el_gets(e, count);
260 }
261
262 data = -1;
263
264 return result;
265 }
266
267 /*
268 * The Terminal thread entry point.
269 *
270 * The bulk of the interactive work is done here. We read the terminal,
271 * write the results to our ppp descriptor and read the results back.
272 *
273 * While reading the terminal (using el_gets()), it's possible to take
274 * a SIGUSR1 from the Monitor thread, telling us that the ppp descriptor
275 * has some data. The data is read and displayed by the signal handler
276 * itself.
277 */
278 static void *
Terminal(void * v)279 Terminal(void *v)
280 {
281 struct sigaction act, oact;
282 struct thread_data *td;
283 const char *l;
284 int len;
285 #ifndef __OpenBSD__
286 HistEvent hev = { 0, "" };
287 #endif
288
289 act.sa_handler = InputHandler;
290 sigemptyset(&act.sa_mask);
291 act.sa_flags = SA_RESTART;
292 sigaction(SIGUSR1, &act, &oact);
293
294 td = (struct thread_data *)v;
295 want_sem_post = 1;
296
297 while ((l = SmartGets(td->edit, &len, td->ppp))) {
298 if (len > 1)
299 #ifdef __OpenBSD__
300 history(td->hist, H_ENTER, l);
301 #else
302 history(td->hist, &hev, H_ENTER, l);
303 #endif
304 write(td->ppp, l, len);
305 if (Receive(td->ppp, REC_SHOW) != 0)
306 break;
307 }
308
309 return NULL;
310 }
311
312 /*
313 * The Monitor thread entry point.
314 *
315 * This thread simply monitors our ppp descriptor. When there's something
316 * to read, a SIGUSR1 is sent to the Terminal thread.
317 *
318 * sem_select() is used by the Terminal thread to keep us from sending
319 * flurries of SIGUSR1s, and is used from the main thread to wake us up
320 * when it's time to exit.
321 */
322 static void *
Monitor(void * v)323 Monitor(void *v)
324 {
325 struct thread_data *td;
326 fd_set f;
327 int ret;
328
329 td = (struct thread_data *)v;
330 FD_ZERO(&f);
331 FD_SET(td->ppp, &f);
332
333 sem_wait(&sem_select);
334 while (!timetogo)
335 if ((ret = select(td->ppp + 1, &f, NULL, NULL, NULL)) > 0) {
336 pthread_kill(td->trm, SIGUSR1);
337 sem_wait(&sem_select);
338 }
339
340 return NULL;
341 }
342
343 static const char *
sockaddr_ntop(const struct sockaddr * sa)344 sockaddr_ntop(const struct sockaddr *sa)
345 {
346 const void *addr;
347 static char addrbuf[INET6_ADDRSTRLEN];
348
349 switch (sa->sa_family) {
350 case AF_INET:
351 addr = &((const struct sockaddr_in *)sa)->sin_addr;
352 break;
353 case AF_UNIX:
354 addr = &((const struct sockaddr_un *)sa)->sun_path;
355 break;
356 case AF_INET6:
357 addr = &((const struct sockaddr_in6 *)sa)->sin6_addr;
358 break;
359 default:
360 return NULL;
361 }
362 inet_ntop(sa->sa_family, addr, addrbuf, sizeof(addrbuf));
363 return addrbuf;
364 }
365
366 /*
367 * Connect to ppp using either a local domain socket or a tcp socket.
368 *
369 * If we're given arguments, process them and quit, otherwise create two
370 * threads to handle interactive mode.
371 */
372 int
main(int argc,char ** argv)373 main(int argc, char **argv)
374 {
375 struct sockaddr_un ifsun;
376 int n, arg, fd, len, verbose, save_errno, hide1, hide1off, hide2;
377 unsigned TimeoutVal;
378 char *DoneWord = "x", *next, *start;
379 struct sigaction act, oact;
380 void *thread_ret;
381 pthread_t mon;
382 char Command[LINELEN];
383 char Buffer[LINELEN];
384
385 verbose = 0;
386 TimeoutVal = 2;
387 hide1 = hide1off = hide2 = 0;
388
389 for (arg = 1; arg < argc; arg++)
390 if (*argv[arg] == '-') {
391 for (start = argv[arg] + 1; *start; start++)
392 switch (*start) {
393 case 't':
394 TimeoutVal = (unsigned)atoi
395 (start[1] ? start + 1 : argv[++arg]);
396 start = DoneWord;
397 break;
398
399 case 'v':
400 verbose = REC_VERBOSE;
401 break;
402
403 case 'p':
404 if (start[1]) {
405 hide1 = arg;
406 hide1off = start - argv[arg];
407 passwd = start + 1;
408 } else {
409 hide1 = arg;
410 hide1off = start - argv[arg];
411 passwd = argv[++arg];
412 hide2 = arg;
413 }
414 start = DoneWord;
415 break;
416
417 default:
418 usage();
419 }
420 }
421 else
422 break;
423
424
425 if (argc < arg + 1)
426 usage();
427
428 if (hide1) {
429 char title[1024];
430 int pos, harg;
431
432 for (harg = pos = 0; harg < argc; harg++)
433 if (harg == 0 || harg != hide2) {
434 if (harg == 0 || harg != hide1)
435 n = snprintf(title + pos, sizeof title - pos, "%s%s",
436 harg ? " " : "", argv[harg]);
437 else if (hide1off > 1)
438 n = snprintf(title + pos, sizeof title - pos, " %.*s",
439 hide1off, argv[harg]);
440 else
441 n = 0;
442 if (n < 0 || n >= sizeof title - pos)
443 break;
444 pos += n;
445 }
446 #ifdef __FreeBSD__
447 setproctitle("-%s", title);
448 #else
449 setproctitle("%s", title);
450 #endif
451 }
452
453 if (*argv[arg] == '/') {
454 memset(&ifsun, '\0', sizeof ifsun);
455 ifsun.sun_len = strlen(argv[arg]);
456 if (ifsun.sun_len > sizeof ifsun.sun_path - 1) {
457 warnx("%s: path too long", argv[arg]);
458 return 1;
459 }
460 ifsun.sun_family = AF_LOCAL;
461 strcpy(ifsun.sun_path, argv[arg]);
462
463 if (fd = socket(AF_LOCAL, SOCK_STREAM, 0), fd < 0) {
464 warnx("cannot create local domain socket");
465 return 2;
466 }
467 if (connect(fd, (struct sockaddr *)&ifsun, sizeof(ifsun)) < 0) {
468 if (errno)
469 warn("cannot connect to socket %s", argv[arg]);
470 else
471 warnx("cannot connect to socket %s", argv[arg]);
472 close(fd);
473 return 3;
474 }
475 } else {
476 char *addr, *p, *port;
477 const char *caddr;
478 struct addrinfo hints, *res, *pai;
479 int gai;
480 char local[] = "localhost";
481
482 addr = argv[arg];
483 if (addr[strspn(addr, "0123456789")] == '\0') {
484 /* port on local machine */
485 port = addr;
486 addr = local;
487 } else if (*addr == '[') {
488 /* [addr]:port */
489 if ((p = strchr(addr, ']')) == NULL) {
490 warnx("%s: mismatched '['", addr);
491 return 1;
492 }
493 addr++;
494 *p++ = '\0';
495 if (*p != ':') {
496 warnx("%s: missing port", addr);
497 return 1;
498 }
499 port = ++p;
500 } else {
501 /* addr:port */
502 p = addr + strcspn(addr, ":");
503 if (*p != ':') {
504 warnx("%s: missing port", addr);
505 return 1;
506 }
507 *p++ = '\0';
508 port = p;
509 }
510 memset(&hints, 0, sizeof(hints));
511 hints.ai_socktype = SOCK_STREAM;
512 gai = getaddrinfo(addr, port, &hints, &res);
513 if (gai != 0) {
514 warnx("%s: %s", addr, gai_strerror(gai));
515 return 1;
516 }
517 for (pai = res; pai != NULL; pai = pai->ai_next) {
518 if (fd = socket(pai->ai_family, pai->ai_socktype,
519 pai->ai_protocol), fd < 0) {
520 warnx("cannot create socket");
521 continue;
522 }
523 TimedOut = 0;
524 if (TimeoutVal) {
525 act.sa_handler = Timeout;
526 sigemptyset(&act.sa_mask);
527 act.sa_flags = 0;
528 sigaction(SIGALRM, &act, &oact);
529 alarm(TimeoutVal);
530 }
531 if (connect(fd, pai->ai_addr, pai->ai_addrlen) == 0)
532 break;
533 if (TimeoutVal) {
534 save_errno = errno;
535 alarm(0);
536 sigaction(SIGALRM, &oact, 0);
537 errno = save_errno;
538 }
539 caddr = sockaddr_ntop(pai->ai_addr);
540 if (caddr == NULL)
541 caddr = argv[arg];
542 if (TimedOut)
543 warnx("timeout: cannot connect to %s", caddr);
544 else {
545 if (errno)
546 warn("cannot connect to %s", caddr);
547 else
548 warnx("cannot connect to %s", caddr);
549 }
550 close(fd);
551 }
552 freeaddrinfo(res);
553 if (pai == NULL)
554 return 1;
555 if (TimeoutVal) {
556 alarm(0);
557 sigaction(SIGALRM, &oact, 0);
558 }
559 }
560
561 len = 0;
562 Command[sizeof(Command)-1] = '\0';
563 for (arg++; arg < argc; arg++) {
564 if (len && len < sizeof(Command)-1)
565 strcpy(Command+len++, " ");
566 strncpy(Command+len, argv[arg], sizeof(Command)-len-1);
567 len += strlen(Command+len);
568 }
569
570 switch (Receive(fd, verbose | REC_PASSWD)) {
571 case 1:
572 fprintf(stderr, "Password incorrect\n");
573 break;
574
575 case 0:
576 passwd = NULL;
577 if (len == 0) {
578 struct thread_data td;
579 const char *env;
580 int size;
581 #ifndef __OpenBSD__
582 HistEvent hev = { 0, "" };
583 #endif
584
585 td.hist = history_init();
586 if ((env = getenv("EL_SIZE"))) {
587 size = atoi(env);
588 if (size < 0)
589 size = 20;
590 } else
591 size = 20;
592 #ifdef __OpenBSD__
593 history(td.hist, H_EVENT, size);
594 td.edit = el_init("pppctl", stdin, stdout);
595 #else
596 history(td.hist, &hev, H_SETSIZE, size);
597 td.edit = el_init("pppctl", stdin, stdout, stderr);
598 #endif
599 el_source(td.edit, NULL);
600 el_set(td.edit, EL_PROMPT, GetPrompt);
601 if ((env = getenv("EL_EDITOR"))) {
602 if (!strcmp(env, "vi"))
603 el_set(td.edit, EL_EDITOR, "vi");
604 else if (!strcmp(env, "emacs"))
605 el_set(td.edit, EL_EDITOR, "emacs");
606 }
607 el_set(td.edit, EL_SIGNAL, 1);
608 el_set(td.edit, EL_HIST, history, (const char *)td.hist);
609
610 td.ppp = fd;
611 td.trm = NULL;
612
613 /*
614 * We create two threads. The Terminal thread does all the
615 * work while the Monitor thread simply tells the Terminal
616 * thread when ``fd'' becomes readable. The telling is done
617 * by sending a SIGUSR1 to the Terminal thread. The
618 * sem_select semaphore is used to prevent the monitor
619 * thread from firing excessive signals at the Terminal
620 * thread (it's abused for exit handling too - see below).
621 *
622 * The Terminal thread never uses td.trm !
623 */
624 sem_init(&sem_select, 0, 0);
625
626 pthread_create(&td.trm, NULL, Terminal, &td);
627 pthread_create(&mon, NULL, Monitor, &td);
628
629 /* Wait for the terminal thread to finish */
630 pthread_join(td.trm, &thread_ret);
631 fprintf(stderr, "Connection closed\n");
632
633 /* Get rid of the monitor thread by abusing sem_select */
634 timetogo = 1;
635 close(fd);
636 fd = -1;
637 sem_post(&sem_select);
638 pthread_join(mon, &thread_ret);
639
640 /* Restore our terminal and release resources */
641 el_end(td.edit);
642 history_end(td.hist);
643 sem_destroy(&sem_select);
644 } else {
645 start = Command;
646 do {
647 next = strchr(start, ';');
648 while (*start == ' ' || *start == '\t')
649 start++;
650 if (next)
651 *next = '\0';
652 strcpy(Buffer, start);
653 Buffer[sizeof(Buffer)-2] = '\0';
654 strcat(Buffer, "\n");
655 if (verbose)
656 write(STDOUT_FILENO, Buffer, strlen(Buffer));
657 write(fd, Buffer, strlen(Buffer));
658 if (Receive(fd, verbose | REC_SHOW) != 0) {
659 fprintf(stderr, "Connection closed\n");
660 break;
661 }
662 if (next)
663 start = ++next;
664 } while (next && *next);
665 if (verbose)
666 write(STDOUT_FILENO, "quit\n", 5);
667 write(fd, "quit\n", 5);
668 while (Receive(fd, verbose | REC_SHOW) == 0)
669 ;
670 if (verbose)
671 puts("");
672 }
673 break;
674
675 default:
676 warnx("ppp is not responding");
677 break;
678 }
679
680 if (fd != -1)
681 close(fd);
682
683 return 0;
684 }
685