2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/types.h>
31 #include <sys/socket.h>
32 #include <netinet/in.h>
33 #include <arpa/inet.h>
41 #include <semaphore.h>
53 /* Data passed to the threads we create */
55 EditLine *edit; /* libedit stuff */
56 History *hist; /* libedit stuff */
57 pthread_t trm; /* Terminal thread (for pthread_kill()) */
58 int ppp; /* ppp descriptor */
61 /* Flags passed to Receive() */
62 #define REC_PASSWD (1) /* Handle a password request from ppp */
63 #define REC_SHOW (2) /* Show everything except prompts */
64 #define REC_VERBOSE (4) /* Show everything */
67 static char *prompt; /* Tell libedit what the current prompt is */
68 static int data = -1; /* setjmp() has been done when data != -1 */
69 static jmp_buf pppdead; /* Jump the Terminal thread out of el_gets() */
70 static int timetogo; /* Tell the Monitor thread to exit */
71 static sem_t sem_select; /* select() co-ordination between threads */
72 static int TimedOut; /* Set if our connect() timed out */
73 static int want_sem_post; /* Need to let the Monitor thread in ? */
76 * How to use pppctl...
81 fprintf(stderr, "usage: pppctl [-v] [-t n] [-p passwd] "
82 "Port|LocalSock [command[;command]...]\n");
83 fprintf(stderr, " -v tells pppctl to output all"
85 fprintf(stderr, " -t n specifies a timeout of n"
86 " seconds when connecting (default 2)\n");
87 fprintf(stderr, " -p passwd specifies your password\n");
92 * Handle the SIGALRM received due to a connect() timeout.
101 * A callback routine for libedit to find out what the current prompt is.
102 * All the work is done in Receive() below.
105 GetPrompt(EditLine *e)
113 * Receive data from the ppp descriptor.
114 * We also handle password prompts here (if asked via the `display' arg)
115 * and buffer what our prompt looks like (via the `prompt' global).
118 Receive(int fd, int display)
120 static char Buffer[LINELEN];
121 char temp[sizeof(Buffer)];
136 while (Result = read(fd, Buffer+len, sizeof(Buffer)-len-1), Result != -1) {
143 if (len > 2 && !strcmp(Buffer+len-2, "> ")) {
144 prompt = strrchr(Buffer, '\n');
145 if (display & (REC_SHOW|REC_VERBOSE)) {
146 if (display & REC_VERBOSE)
152 write(STDOUT_FILENO, Buffer, last-Buffer);
155 prompt = prompt == NULL ? Buffer : prompt+1;
156 for (last = Buffer+len-2; last > Buffer && *last != ' '; last--)
158 if (last > Buffer+3 && !strncmp(last-3, " on", 3)) {
159 /* a password is required ! */
160 if (display & REC_PASSWD) {
163 passwd = getpass("Password: ");
164 sprintf(Buffer, "passwd %s\n", passwd);
165 memset(passwd, '\0', strlen(passwd));
166 if (display & REC_VERBOSE)
167 write(STDOUT_FILENO, Buffer, strlen(Buffer));
168 write(fd, Buffer, strlen(Buffer));
169 memset(Buffer, '\0', strlen(Buffer));
170 return Receive(fd, display & ~REC_PASSWD);
178 if (len == sizeof Buffer - 1) {
180 if ((last = strrchr(Buffer, '\n')) == NULL)
181 /* Yeuch - this is one mother of a line ! */
182 flush = sizeof Buffer / 2;
184 flush = last - Buffer + 1;
185 write(STDOUT_FILENO, Buffer, flush);
186 strcpy(temp, Buffer + flush);
187 strcpy(Buffer, temp);
190 if ((Result = select(fd + 1, &f, NULL, NULL, &t)) <= 0) {
191 err = Result == -1 ? errno : 0;
193 write(STDOUT_FILENO, Buffer, len);
204 * Handle being told by the Monitor thread that there's data to be read
205 * on the ppp descriptor.
207 * Note, this is a signal handler - be careful of what we do !
210 InputHandler(int sig)
212 static char buf[LINELEN];
220 t.tv_sec = t.tv_usec = 0;
222 if (select(data + 1, &f, NULL, NULL, &t) > 0) {
223 len = read(data, buf, sizeof buf);
226 write(STDOUT_FILENO, buf, len);
228 longjmp(pppdead, -1);
231 sem_post(&sem_select);
233 /* Don't let the Monitor thread in 'till we've set ``data'' up again */
238 * This is a simple wrapper for el_gets(), allowing our SIGUSR1 signal
239 * handler (above) to take effect only after we've done a setjmp().
241 * We don't want it to do anything outside of here as we're going to
242 * service the ppp descriptor anyway.
245 SmartGets(EditLine *e, int *count, int fd)
254 /* Let the Monitor thread in again */
255 sem_post(&sem_select);
256 result = el_gets(e, count);
265 * The Terminal thread entry point.
267 * The bulk of the interactive work is done here. We read the terminal,
268 * write the results to our ppp descriptor and read the results back.
270 * While reading the terminal (using el_gets()), it's possible to take
271 * a SIGUSR1 from the Monitor thread, telling us that the ppp descriptor
272 * has some data. The data is read and displayed by the signal handler
278 struct sigaction act, oact;
279 struct thread_data *td;
283 HistEvent hev = { 0, "" };
286 act.sa_handler = InputHandler;
287 sigemptyset(&act.sa_mask);
288 act.sa_flags = SA_RESTART;
289 sigaction(SIGUSR1, &act, &oact);
291 td = (struct thread_data *)v;
294 while ((l = SmartGets(td->edit, &len, td->ppp))) {
297 history(td->hist, H_ENTER, l);
299 history(td->hist, &hev, H_ENTER, l);
301 write(td->ppp, l, len);
302 if (Receive(td->ppp, REC_SHOW) != 0)
310 * The Monitor thread entry point.
312 * This thread simply monitors our ppp descriptor. When there's something
313 * to read, a SIGUSR1 is sent to the Terminal thread.
315 * sem_select() is used by the Terminal thread to keep us from sending
316 * flurries of SIGUSR1s, and is used from the main thread to wake us up
317 * when it's time to exit.
322 struct thread_data *td;
326 td = (struct thread_data *)v;
330 sem_wait(&sem_select);
332 if ((ret = select(td->ppp + 1, &f, NULL, NULL, NULL)) > 0) {
333 pthread_kill(td->trm, SIGUSR1);
334 sem_wait(&sem_select);
341 sockaddr_ntop(const struct sockaddr *sa)
344 static char addrbuf[INET6_ADDRSTRLEN];
346 switch (sa->sa_family) {
348 addr = &((const struct sockaddr_in *)sa)->sin_addr;
351 addr = &((const struct sockaddr_un *)sa)->sun_path;
354 addr = &((const struct sockaddr_in6 *)sa)->sin6_addr;
359 inet_ntop(sa->sa_family, addr, addrbuf, sizeof(addrbuf));
364 * Connect to ppp using either a local domain socket or a tcp socket.
366 * If we're given arguments, process them and quit, otherwise create two
367 * threads to handle interactive mode.
370 main(int argc, char **argv)
372 struct sockaddr_un ifsun;
373 int n, arg, fd, len, verbose, save_errno, hide1, hide1off, hide2;
375 char *DoneWord = "x", *next, *start;
376 struct sigaction act, oact;
379 char Command[LINELEN];
380 char Buffer[LINELEN];
384 hide1 = hide1off = hide2 = 0;
386 for (arg = 1; arg < argc; arg++)
387 if (*argv[arg] == '-') {
388 for (start = argv[arg] + 1; *start; start++)
391 TimeoutVal = (unsigned)atoi
392 (start[1] ? start + 1 : argv[++arg]);
397 verbose = REC_VERBOSE;
403 hide1off = start - argv[arg];
407 hide1off = start - argv[arg];
408 passwd = argv[++arg];
429 for (harg = pos = 0; harg < argc; harg++)
430 if (harg == 0 || harg != hide2) {
431 if (harg == 0 || harg != hide1)
432 n = snprintf(title + pos, sizeof title - pos, "%s%s",
433 harg ? " " : "", argv[harg]);
434 else if (hide1off > 1)
435 n = snprintf(title + pos, sizeof title - pos, " %.*s",
436 hide1off, argv[harg]);
439 if (n < 0 || n >= sizeof title - pos)
444 setproctitle("-%s", title);
446 setproctitle("%s", title);
450 if (*argv[arg] == '/') {
451 memset(&ifsun, '\0', sizeof ifsun);
452 ifsun.sun_len = strlen(argv[arg]);
453 if (ifsun.sun_len > sizeof ifsun.sun_path - 1) {
454 warnx("%s: path too long", argv[arg]);
457 ifsun.sun_family = AF_LOCAL;
458 strcpy(ifsun.sun_path, argv[arg]);
460 if (fd = socket(AF_LOCAL, SOCK_STREAM, 0), fd < 0) {
461 warnx("cannot create local domain socket");
464 if (connect(fd, (struct sockaddr *)&ifsun, sizeof(ifsun)) < 0) {
466 warn("cannot connect to socket %s", argv[arg]);
468 warnx("cannot connect to socket %s", argv[arg]);
473 char *addr, *p, *port;
475 struct addrinfo hints, *res, *pai;
477 char local[] = "localhost";
480 if (addr[strspn(addr, "0123456789")] == '\0') {
481 /* port on local machine */
484 } else if (*addr == '[') {
486 if ((p = strchr(addr, ']')) == NULL) {
487 warnx("%s: mismatched '['", addr);
493 warnx("%s: missing port", addr);
499 p = addr + strcspn(addr, ":");
501 warnx("%s: missing port", addr);
507 memset(&hints, 0, sizeof(hints));
508 hints.ai_socktype = SOCK_STREAM;
509 gai = getaddrinfo(addr, port, &hints, &res);
511 warnx("%s: %s", addr, gai_strerror(gai));
514 for (pai = res; pai != NULL; pai = pai->ai_next) {
515 if (fd = socket(pai->ai_family, pai->ai_socktype,
516 pai->ai_protocol), fd < 0) {
517 warnx("cannot create socket");
522 act.sa_handler = Timeout;
523 sigemptyset(&act.sa_mask);
525 sigaction(SIGALRM, &act, &oact);
528 if (connect(fd, pai->ai_addr, pai->ai_addrlen) == 0)
533 sigaction(SIGALRM, &oact, 0);
536 caddr = sockaddr_ntop(pai->ai_addr);
540 warnx("timeout: cannot connect to %s", caddr);
543 warn("cannot connect to %s", caddr);
545 warnx("cannot connect to %s", caddr);
554 sigaction(SIGALRM, &oact, 0);
559 Command[sizeof(Command)-1] = '\0';
560 for (arg++; arg < argc; arg++) {
561 if (len && len < sizeof(Command)-1)
562 strcpy(Command+len++, " ");
563 strncpy(Command+len, argv[arg], sizeof(Command)-len-1);
564 len += strlen(Command+len);
567 switch (Receive(fd, verbose | REC_PASSWD)) {
569 fprintf(stderr, "Password incorrect\n");
575 struct thread_data td;
579 HistEvent hev = { 0, "" };
582 td.hist = history_init();
583 if ((env = getenv("EL_SIZE"))) {
590 history(td.hist, H_EVENT, size);
591 td.edit = el_init("pppctl", stdin, stdout);
593 history(td.hist, &hev, H_SETSIZE, size);
594 td.edit = el_init("pppctl", stdin, stdout, stderr);
596 el_source(td.edit, NULL);
597 el_set(td.edit, EL_PROMPT, GetPrompt);
598 if ((env = getenv("EL_EDITOR"))) {
599 if (!strcmp(env, "vi"))
600 el_set(td.edit, EL_EDITOR, "vi");
601 else if (!strcmp(env, "emacs"))
602 el_set(td.edit, EL_EDITOR, "emacs");
604 el_set(td.edit, EL_SIGNAL, 1);
605 el_set(td.edit, EL_HIST, history, (const char *)td.hist);
611 * We create two threads. The Terminal thread does all the
612 * work while the Monitor thread simply tells the Terminal
613 * thread when ``fd'' becomes readable. The telling is done
614 * by sending a SIGUSR1 to the Terminal thread. The
615 * sem_select semaphore is used to prevent the monitor
616 * thread from firing excessive signals at the Terminal
617 * thread (it's abused for exit handling too - see below).
619 * The Terminal thread never uses td.trm !
621 sem_init(&sem_select, 0, 0);
623 pthread_create(&td.trm, NULL, Terminal, &td);
624 pthread_create(&mon, NULL, Monitor, &td);
626 /* Wait for the terminal thread to finish */
627 pthread_join(td.trm, &thread_ret);
628 fprintf(stderr, "Connection closed\n");
630 /* Get rid of the monitor thread by abusing sem_select */
634 sem_post(&sem_select);
635 pthread_join(mon, &thread_ret);
637 /* Restore our terminal and release resources */
639 history_end(td.hist);
640 sem_destroy(&sem_select);
644 next = strchr(start, ';');
645 while (*start == ' ' || *start == '\t')
649 strcpy(Buffer, start);
650 Buffer[sizeof(Buffer)-2] = '\0';
651 strcat(Buffer, "\n");
653 write(STDOUT_FILENO, Buffer, strlen(Buffer));
654 write(fd, Buffer, strlen(Buffer));
655 if (Receive(fd, verbose | REC_SHOW) != 0) {
656 fprintf(stderr, "Connection closed\n");
661 } while (next && *next);
663 write(STDOUT_FILENO, "quit\n", 5);
664 write(fd, "quit\n", 5);
665 while (Receive(fd, verbose | REC_SHOW) == 0)
673 warnx("ppp is not responding");