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