summaryrefslogtreecommitdiffstats
path: root/usr.sbin/pppctl/pppctl.c
blob: 1ff63b31dfe2de87eec2c16eb2cf6a6742fdf5ec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
/*-
 * Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/types.h>

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/un.h>
#include <netdb.h>

#include <sys/time.h>
#include <err.h>
#include <errno.h>
#include <histedit.h>
#include <semaphore.h>
#include <pthread.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#define LINELEN 2048

/* Data passed to the threads we create */
struct thread_data {
    EditLine *edit;		/* libedit stuff */
    History *hist;		/* libedit stuff */
    pthread_t trm;		/* Terminal thread (for pthread_kill()) */
    int ppp;			/* ppp descriptor */
};

/* Flags passed to Receive() */
#define REC_PASSWD  (1)		/* Handle a password request from ppp */
#define REC_SHOW    (2)		/* Show everything except prompts */
#define REC_VERBOSE (4)		/* Show everything */

static char *passwd;
static char *prompt;		/* Tell libedit what the current prompt is */
static int data = -1;		/* setjmp() has been done when data != -1 */
static jmp_buf pppdead;		/* Jump the Terminal thread out of el_gets() */
static int timetogo;		/* Tell the Monitor thread to exit */
static sem_t sem_select;	/* select() co-ordination between threads */
static int TimedOut;		/* Set if our connect() timed out */
static int want_sem_post;	/* Need to let the Monitor thread in ? */

/*
 * How to use pppctl...
 */
static int
usage()
{
    fprintf(stderr, "usage: pppctl [-v] [-t n] [-p passwd] "
            "Port|LocalSock [command[;command]...]\n");
    fprintf(stderr, "              -v tells pppctl to output all"
            " conversation\n");
    fprintf(stderr, "              -t n specifies a timeout of n"
            " seconds when connecting (default 2)\n");
    fprintf(stderr, "              -p passwd specifies your password\n");
    exit(1);
}

/*
 * Handle the SIGALRM received due to a connect() timeout.
 */
static void
Timeout(int Sig)
{
    TimedOut = 1;
}

/*
 * A callback routine for libedit to find out what the current prompt is.
 * All the work is done in Receive() below.
 */
static char *
GetPrompt(EditLine *e)
{
    if (prompt == NULL)
        prompt = "";
    return prompt;
}

/*
 * Receive data from the ppp descriptor.
 * We also handle password prompts here (if asked via the `display' arg)
 * and buffer what our prompt looks like (via the `prompt' global).
 */
static int
Receive(int fd, int display)
{
    static char Buffer[LINELEN];
    struct timeval t;
    int Result;
    char *last;
    fd_set f;
    int len;

    FD_ZERO(&f);
    FD_SET(fd, &f);
    t.tv_sec = 0;
    t.tv_usec = 100000;
    prompt = Buffer;
    len = 0;

    while (Result = read(fd, Buffer+len, sizeof(Buffer)-len-1), Result != -1) {
        if (Result == 0 && errno != EINTR) {
            Result = -1;
            break;
        }
        len += Result;
        Buffer[len] = '\0';
        if (len > 2 && !strcmp(Buffer+len-2, "> ")) {
            prompt = strrchr(Buffer, '\n');
            if (display & (REC_SHOW|REC_VERBOSE)) {
                if (display & REC_VERBOSE)
                    last = Buffer+len-1;
                else
                    last = prompt;
                if (last) {
                    last++;
                    write(STDOUT_FILENO, Buffer, last-Buffer);
                }
            }
            prompt = prompt == NULL ? Buffer : prompt+1;
            for (last = Buffer+len-2; last > Buffer && *last != ' '; last--)
                ;
            if (last > Buffer+3 && !strncmp(last-3, " on", 3)) {
                 /* a password is required ! */
                 if (display & REC_PASSWD) {
                    /* password time */
                    if (!passwd)
                        passwd = getpass("Password: ");
                    sprintf(Buffer, "passwd %s\n", passwd);
                    memset(passwd, '\0', strlen(passwd));
                    if (display & REC_VERBOSE)
                        write(STDOUT_FILENO, Buffer, strlen(Buffer));
                    write(fd, Buffer, strlen(Buffer));
                    memset(Buffer, '\0', strlen(Buffer));
                    return Receive(fd, display & ~REC_PASSWD);
                }
                Result = 1;
            } else
                Result = 0;
            break;
        } else
            prompt = "";
        if (len == sizeof Buffer - 1) {
            int flush;
            if ((last = strrchr(Buffer, '\n')) == NULL)
                /* Yeuch - this is one mother of a line ! */
                flush = sizeof Buffer / 2;
            else
                flush = last - Buffer + 1;
            write(STDOUT_FILENO, Buffer, flush);
            strcpy(Buffer, Buffer + flush);
            len -= flush;
        }
        if ((Result = select(fd + 1, &f, NULL, NULL, &t)) <= 0) {
            if (len)
                write(STDOUT_FILENO, Buffer, len);
            break;
        }
    }

    return Result;
}

/*
 * Handle being told by the Monitor thread that there's data to be read
 * on the ppp descriptor.
 *
 * Note, this is a signal handler - be careful of what we do !
 */
static void
InputHandler(int sig)
{
    static char buf[LINELEN];
    struct timeval t;
    int len;
    fd_set f;

    if (data != -1) {
        FD_ZERO(&f);
        FD_SET(data, &f);
        t.tv_sec = t.tv_usec = 0;

        if (select(data + 1, &f, NULL, NULL, &t) > 0) {
            len = read(data, buf, sizeof buf);

            if (len > 0)
                write(STDOUT_FILENO, buf, len);
            else if (data != -1)
                longjmp(pppdead, -1);
        }

        sem_post(&sem_select);
    } else
        /* Don't let the Monitor thread in 'till we've set ``data'' up again */
        want_sem_post = 1;
}

/*
 * This is a simple wrapper for el_gets(), allowing our SIGUSR1 signal
 * handler (above) to take effect only after we've done a setjmp().
 *
 * We don't want it to do anything outside of here as we're going to
 * service the ppp descriptor anyway.
 */
static const char *
SmartGets(EditLine *e, int *count, int fd)
{
    const char *result;

    if (setjmp(pppdead))
        result = NULL;
    else {
        data = fd;
        if (want_sem_post)
            /* Let the Monitor thread in again */
            sem_post(&sem_select);
        result = el_gets(e, count);
    }

    data = -1;

    return result;
}

/*
 * The Terminal thread entry point.
 *
 * The bulk of the interactive work is done here.  We read the terminal,
 * write the results to our ppp descriptor and read the results back.
 *
 * While reading the terminal (using el_gets()), it's possible to take
 * a SIGUSR1 from the Monitor thread, telling us that the ppp descriptor
 * has some data.  The data is read and displayed by the signal handler
 * itself.
 */
static void *
Terminal(void *v)
{
    struct sigaction act, oact;
    struct thread_data *td;
    const char *l;
    int len;
#ifndef __OpenBSD__
    HistEvent hev = { 0, "" };
#endif

    act.sa_handler = InputHandler;
    sigemptyset(&act.sa_mask);
    act.sa_flags = SA_RESTART;
    sigaction(SIGUSR1, &act, &oact);

    td = (struct thread_data *)v;
    want_sem_post = 1;

    while ((l = SmartGets(td->edit, &len, td->ppp))) {
        if (len > 1)
#ifdef __OpenBSD__
            history(td->hist, H_ENTER, l);
#else
            history(td->hist, &hev, H_ENTER, l);
#endif
        write(td->ppp, l, len);
        if (Receive(td->ppp, REC_SHOW) != 0)
            break;
    }

    return NULL;
}

/*
 * The Monitor thread entry point.
 *
 * This thread simply monitors our ppp descriptor.  When there's something
 * to read, a SIGUSR1 is sent to the Terminal thread.
 *
 * sem_select() is used by the Terminal thread to keep us from sending
 * flurries of SIGUSR1s, and is used from the main thread to wake us up
 * when it's time to exit.
 */
static void *
Monitor(void *v)
{
    struct thread_data *td;
    fd_set f;
    int ret;

    td = (struct thread_data *)v;
    FD_ZERO(&f);
    FD_SET(td->ppp, &f);

    sem_wait(&sem_select);
    while (!timetogo)
        if ((ret = select(td->ppp + 1, &f, NULL, NULL, NULL)) > 0) {
            pthread_kill(td->trm, SIGUSR1);
            sem_wait(&sem_select);
        }

    return NULL;
}

static const char *
sockaddr_ntop(const struct sockaddr *sa)
{
    const void *addr;
    static char addrbuf[INET6_ADDRSTRLEN];
 
    switch (sa->sa_family) {
    case AF_INET:
	addr = &((const struct sockaddr_in *)sa)->sin_addr;
	break;
    case AF_UNIX:
	addr = &((const struct sockaddr_un *)sa)->sun_path;                
	break;
    case AF_INET6:
	addr = &((const struct sockaddr_in6 *)sa)->sin6_addr;
	break;
    default:
	return NULL;
    }
    inet_ntop(sa->sa_family, addr, addrbuf, sizeof(addrbuf));                
    return addrbuf;
}

/*
 * Connect to ppp using either a local domain socket or a tcp socket.
 *
 * If we're given arguments, process them and quit, otherwise create two
 * threads to handle interactive mode.
 */
int
main(int argc, char **argv)
{
    struct sockaddr_un ifsun;
    int n, arg, fd, len, verbose, save_errno, hide1, hide1off, hide2;
    unsigned TimeoutVal;
    char *DoneWord = "x", *next, *start;
    struct sigaction act, oact;
    void *thread_ret;
    pthread_t mon;
    char Command[LINELEN];
    char Buffer[LINELEN];

    verbose = 0;
    TimeoutVal = 2;
    hide1 = hide1off = hide2 = 0;

    for (arg = 1; arg < argc; arg++)
        if (*argv[arg] == '-') {
            for (start = argv[arg] + 1; *start; start++)
                switch (*start) {
                    case 't':
                        TimeoutVal = (unsigned)atoi
                            (start[1] ? start + 1 : argv[++arg]);
                        start = DoneWord;
                        break;
    
                    case 'v':
                        verbose = REC_VERBOSE;
                        break;

                    case 'p':
                        if (start[1]) {
                          hide1 = arg;
                          hide1off = start - argv[arg];
                          passwd = start + 1;
                        } else {
                          hide1 = arg;
                          hide1off = start - argv[arg];
                          passwd = argv[++arg];
                          hide2 = arg;
                        }
                        start = DoneWord;
                        break;
    
                    default:
                        usage();
                }
        }
        else
            break;


    if (argc < arg + 1)
        usage();

    if (hide1) {
      char title[1024];
      int pos, harg;

      for (harg = pos = 0; harg < argc; harg++)
        if (harg == 0 || harg != hide2) {
          if (harg == 0 || harg != hide1)
            n = snprintf(title + pos, sizeof title - pos, "%s%s",
                            harg ? " " : "", argv[harg]);
          else if (hide1off > 1)
            n = snprintf(title + pos, sizeof title - pos, " %.*s",
                            hide1off, argv[harg]);
          else
            n = 0;
          if (n < 0 || n >= sizeof title - pos)
            break;
          pos += n;
        }
#ifdef __FreeBSD__
      setproctitle("-%s", title);
#else
      setproctitle("%s", title);
#endif
    }

    if (*argv[arg] == '/') {
        memset(&ifsun, '\0', sizeof ifsun);
        ifsun.sun_len = strlen(argv[arg]);
        if (ifsun.sun_len > sizeof ifsun.sun_path - 1) {
            warnx("%s: path too long", argv[arg]);
            return 1;
        }
        ifsun.sun_family = AF_LOCAL;
        strcpy(ifsun.sun_path, argv[arg]);

        if (fd = socket(AF_LOCAL, SOCK_STREAM, 0), fd < 0) {
            warnx("cannot create local domain socket");
            return 2;
        }
	if (connect(fd, (struct sockaddr *)&ifsun, sizeof(ifsun)) < 0) {
	    if (errno)
		warn("cannot connect to socket %s", argv[arg]);
	    else
		warnx("cannot connect to socket %s", argv[arg]);
	    close(fd);
	    return 3;
	}
    } else {
        char *addr, *p, *port;
	const char *caddr;
	struct addrinfo hints, *res, *pai;
        int gai;
	char local[] = "localhost";

	addr = argv[arg];
	if (addr[strspn(addr, "0123456789")] == '\0') {
	    /* port on local machine */
	    port = addr;
	    addr = local;
	} else if (*addr == '[') {
	    /* [addr]:port */
	    if ((p = strchr(addr, ']')) == NULL) {
		warnx("%s: mismatched '['", addr);
		return 1;
	    }
	    addr++;
	    *p++ = '\0';
	    if (*p != ':') {
		warnx("%s: missing port", addr);
		return 1;
	    }
	    port = ++p;
	} else {
	    /* addr:port */
	    p = addr + strcspn(addr, ":");
	    if (*p != ':') {
		warnx("%s: missing port", addr);
		return 1;
	    }
	    *p++ = '\0';
	    port = p;
	}
	memset(&hints, 0, sizeof(hints));
	hints.ai_socktype = SOCK_STREAM;
	gai = getaddrinfo(addr, port, &hints, &res);
	if (gai != 0) {
	    warnx("%s: %s", addr, gai_strerror(gai));
	    return 1;
	}
	for (pai = res; pai != NULL; pai = pai->ai_next) {
	    if (fd = socket(pai->ai_family, pai->ai_socktype,
		pai->ai_protocol), fd < 0) {
		warnx("cannot create socket");
		continue;
	    }
	    TimedOut = 0;
	    if (TimeoutVal) {
		act.sa_handler = Timeout;
		sigemptyset(&act.sa_mask);
		act.sa_flags = 0;
		sigaction(SIGALRM, &act, &oact);
		alarm(TimeoutVal);
	    }
	    if (connect(fd, pai->ai_addr, pai->ai_addrlen) == 0)
		break;
	    if (TimeoutVal) {
		save_errno = errno;
		alarm(0);
		sigaction(SIGALRM, &oact, 0);
		errno = save_errno;
	    }
	    caddr = sockaddr_ntop(pai->ai_addr);
	    if (caddr == NULL)
		caddr = argv[arg];
	    if (TimedOut)
		warnx("timeout: cannot connect to %s", caddr);
	    else {
		if (errno)
		    warn("cannot connect to %s", caddr);
		else
		    warnx("cannot connect to %s", caddr);
	    }
	    close(fd);
	}
	freeaddrinfo(res);
	if (pai == NULL)
	    return 1;
	if (TimeoutVal) {
	    alarm(0);
	    sigaction(SIGALRM, &oact, 0);
	}
    }

    len = 0;
    Command[sizeof(Command)-1] = '\0';
    for (arg++; arg < argc; arg++) {
        if (len && len < sizeof(Command)-1)
            strcpy(Command+len++, " ");
        strncpy(Command+len, argv[arg], sizeof(Command)-len-1);
        len += strlen(Command+len);
    }

    switch (Receive(fd, verbose | REC_PASSWD)) {
        case 1:
            fprintf(stderr, "Password incorrect\n");
            break;

        case 0:
            passwd = NULL;
            if (len == 0) {
                struct thread_data td;
                const char *env;
                int size;
#ifndef __OpenBSD__
                HistEvent hev = { 0, "" };
#endif

                td.hist = history_init();
                if ((env = getenv("EL_SIZE"))) {
                    size = atoi(env);
                    if (size < 0)
                      size = 20;
                } else
                    size = 20;
#ifdef __OpenBSD__
                history(td.hist, H_EVENT, size);
                td.edit = el_init("pppctl", stdin, stdout);
#else
                history(td.hist, &hev, H_SETSIZE, size);
                td.edit = el_init("pppctl", stdin, stdout, stderr);
#endif
                el_source(td.edit, NULL);
                el_set(td.edit, EL_PROMPT, GetPrompt);
                if ((env = getenv("EL_EDITOR"))) {
                    if (!strcmp(env, "vi"))
                        el_set(td.edit, EL_EDITOR, "vi");
                    else if (!strcmp(env, "emacs"))
                        el_set(td.edit, EL_EDITOR, "emacs");
                }
                el_set(td.edit, EL_SIGNAL, 1);
                el_set(td.edit, EL_HIST, history, (const char *)td.hist);

                td.ppp = fd;
                td.trm = NULL;

                /*
                 * We create two threads.  The Terminal thread does all the
                 * work while the Monitor thread simply tells the Terminal
                 * thread when ``fd'' becomes readable.  The telling is done
                 * by sending a SIGUSR1 to the Terminal thread.  The
                 * sem_select semaphore is used to prevent the monitor
                 * thread from firing excessive signals at the Terminal
                 * thread (it's abused for exit handling too - see below).
                 *
                 * The Terminal thread never uses td.trm !
                 */
                sem_init(&sem_select, 0, 0);

                pthread_create(&td.trm, NULL, Terminal, &td);
                pthread_create(&mon, NULL, Monitor, &td);

                /* Wait for the terminal thread to finish */
                pthread_join(td.trm, &thread_ret);
                fprintf(stderr, "Connection closed\n");

                /* Get rid of the monitor thread by abusing sem_select */
                timetogo = 1;
                close(fd);
                fd = -1;
                sem_post(&sem_select);
                pthread_join(mon, &thread_ret);

                /* Restore our terminal and release resources */
                el_end(td.edit);
                history_end(td.hist);
                sem_destroy(&sem_select);
            } else {
                start = Command;
                do {
                    next = strchr(start, ';');
                    while (*start == ' ' || *start == '\t')
                        start++;
                    if (next)
                        *next = '\0';
                    strcpy(Buffer, start);
                    Buffer[sizeof(Buffer)-2] = '\0';
                    strcat(Buffer, "\n");
                    if (verbose)
                        write(STDOUT_FILENO, Buffer, strlen(Buffer));
                    write(fd, Buffer, strlen(Buffer));
                    if (Receive(fd, verbose | REC_SHOW) != 0) {
                        fprintf(stderr, "Connection closed\n");
                        break;
                    }
                    if (next)
                        start = ++next;
                } while (next && *next);
                if (verbose)
                    write(STDOUT_FILENO, "quit\n", 5);
                write(fd, "quit\n", 5);
                while (Receive(fd, verbose | REC_SHOW) == 0)
                    ;
                if (verbose)
                    puts("");
            }
            break;

        default:
            warnx("ppp is not responding");
            break;
    }

    if (fd != -1)
        close(fd);
    
    return 0;
}
OpenPOWER on IntegriCloud