GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/pppd/main.c Lines: 0 648 0.0 %
Date: 2017-11-13 Branches: 0 496 0.0 %

Line Branch Exec Source
1
/*	$OpenBSD: main.c,v 1.54 2016/03/17 19:40:43 krw Exp $	*/
2
3
/*
4
 * main.c - Point-to-Point Protocol main module
5
 *
6
 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
7
 *
8
 * Redistribution and use in source and binary forms, with or without
9
 * modification, are permitted provided that the following conditions
10
 * are met:
11
 *
12
 * 1. Redistributions of source code must retain the above copyright
13
 *    notice, this list of conditions and the following disclaimer.
14
 *
15
 * 2. Redistributions in binary form must reproduce the above copyright
16
 *    notice, this list of conditions and the following disclaimer in
17
 *    the documentation and/or other materials provided with the
18
 *    distribution.
19
 *
20
 * 3. The name "Carnegie Mellon University" must not be used to
21
 *    endorse or promote products derived from this software without
22
 *    prior written permission. For permission or any legal
23
 *    details, please contact
24
 *      Office of Technology Transfer
25
 *      Carnegie Mellon University
26
 *      5000 Forbes Avenue
27
 *      Pittsburgh, PA  15213-3890
28
 *      (412) 268-4387, fax: (412) 268-7395
29
 *      tech-transfer@andrew.cmu.edu
30
 *
31
 * 4. Redistributions of any form whatsoever must retain the following
32
 *    acknowledgment:
33
 *    "This product includes software developed by Computing Services
34
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
35
 *
36
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
37
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
38
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
39
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
40
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
41
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
42
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
43
 */
44
45
#include <sys/types.h>
46
#include <sys/wait.h>
47
#include <sys/time.h>
48
#include <sys/resource.h>
49
#include <sys/stat.h>
50
#include <sys/socket.h>
51
#include <net/if.h>
52
#include <stdio.h>
53
#include <ctype.h>
54
#include <stdlib.h>
55
#include <string.h>
56
#include <unistd.h>
57
#include <limits.h>
58
#include <signal.h>
59
#include <errno.h>
60
#include <fcntl.h>
61
#include <syslog.h>
62
#include <netdb.h>
63
#include <utmp.h>
64
#include <pwd.h>
65
66
#include "pppd.h"
67
#include "magic.h"
68
#include "fsm.h"
69
#include "lcp.h"
70
#include "ipcp.h"
71
#include "upap.h"
72
#include "chap.h"
73
#include "ccp.h"
74
#include "pathnames.h"
75
#include "patchlevel.h"
76
77
#ifdef CBCP_SUPPORT
78
#include "cbcp.h"
79
#endif
80
81
#if defined(SUNOS4)
82
extern char *strerror();
83
#endif
84
85
#ifdef AT_CHANGE
86
#include "atcp.h"
87
#endif
88
89
/* interface vars */
90
char ifname[IFNAMSIZ];		/* Interface name */
91
int ifunit;			/* Interface unit number */
92
93
char hostname[HOST_NAME_MAX+1];	/* Our hostname */
94
static char default_devnam[PATH_MAX];	/* name of default device */
95
static pid_t pid;		/* Our pid */
96
static uid_t uid;		/* Our real user-id */
97
static int conn_running;	/* we have a [dis]connector running */
98
static int crashed = 0;
99
100
int ttyfd = -1;			/* Serial port file descriptor */
101
mode_t tty_mode = -1;		/* Original access permissions to tty */
102
int baud_rate;			/* Actual bits/second for serial device */
103
int hungup;			/* terminal has been hung up */
104
int privileged;			/* we're running as real uid root */
105
int need_holdoff;		/* need holdoff period before restarting */
106
int detached;			/* have detached from terminal */
107
108
int phase;			/* where the link is at */
109
int kill_link;
110
int open_ccp_flag;
111
112
char **script_env;		/* Env. variable values for scripts */
113
int s_env_nalloc;		/* # words avail at script_env */
114
115
u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
116
u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
117
118
static int n_children;		/* # child processes still running */
119
120
static int locked;		/* lock() has succeeded */
121
122
char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
123
124
/* Prototypes for procedures local to this file. */
125
126
static void cleanup(void);
127
static void close_tty(void);
128
static void get_input(void);
129
static void calltimeout(void);
130
static struct timeval *timeleft(struct timeval *);
131
static void kill_my_pg(int);
132
static void hup(int);
133
static void term(int);
134
static void chld(int);
135
static void toggle_debug(int);
136
static void open_ccp(int);
137
static void bad_signal(int);
138
static void holdoff_end(void *);
139
static int device_script(char *, int, int);
140
static void reap_kids(void);
141
static void pr_log(void *, char *, ...);
142
143
extern	char	*ttyname(int);
144
extern	char	*getlogin(void);
145
int main(int, char *[]);
146
147
#ifdef ultrix
148
#undef	O_NONBLOCK
149
#define	O_NONBLOCK	O_NDELAY
150
#endif
151
152
#ifdef ULTRIX
153
#define setlogmask(x)
154
#endif
155
156
/*
157
 * PPP Data Link Layer "protocol" table.
158
 * One entry per supported protocol.
159
 * The last entry must be NULL.
160
 */
161
struct protent *protocols[] = {
162
    &lcp_protent,
163
    &pap_protent,
164
    &chap_protent,
165
#ifdef CBCP_SUPPORT
166
    &cbcp_protent,
167
#endif
168
    &ipcp_protent,
169
    &ccp_protent,
170
#ifdef AT_CHANGE
171
    &atcp_protent,
172
#endif
173
    NULL
174
};
175
176
int
177
main(argc, argv)
178
    int argc;
179
    char *argv[];
180
{
181
    int i, fdflags;
182
    struct sigaction sa;
183
    char *p;
184
    struct passwd *pw;
185
    struct timeval timo;
186
    sigset_t mask;
187
    struct protent *protp;
188
    struct stat statbuf;
189
    char numbuf[16];
190
191
    phase = PHASE_INITIALIZE;
192
    p = ttyname(0);
193
    if (p)
194
	strlcpy(devnam, p, PATH_MAX);
195
    strlcpy(default_devnam, devnam, sizeof default_devnam);
196
197
    script_env = NULL;
198
199
    /* Initialize syslog facilities */
200
#ifdef ULTRIX
201
    openlog("pppd", LOG_PID);
202
#else
203
    openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
204
    setlogmask(LOG_UPTO(LOG_INFO));
205
#endif
206
207
    if (gethostname(hostname, sizeof hostname) < 0 ) {
208
	option_error("Couldn't get hostname: %m");
209
	die(1);
210
    }
211
212
    uid = getuid();
213
    privileged = uid == 0;
214
    snprintf(numbuf, sizeof numbuf, "%u", uid);
215
    script_setenv("UID", numbuf);
216
217
    /*
218
     * Initialize to the standard option set, then parse, in order,
219
     * the system options file, the user's options file,
220
     * the tty's options file, and the command line arguments.
221
     */
222
    for (i = 0; (protp = protocols[i]) != NULL; ++i)
223
	(*protp->init)(0);
224
225
    if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
226
	|| !options_from_user())
227
	exit(1);
228
    scan_args(argc-1, argv+1);	/* look for tty name on command line */
229
    if (!options_for_tty()
230
	|| !parse_args(argc-1, argv+1))
231
	exit(1);
232
233
    /*
234
     * Check that we are running as root.
235
     */
236
    if (geteuid() != 0) {
237
	option_error("must be root to run %s, since it is not setuid-root",
238
		     argv[0]);
239
	die(1);
240
    }
241
242
    if (!ppp_available()) {
243
	option_error(no_ppp_msg);
244
	exit(1);
245
    }
246
247
    /*
248
     * Check that the options given are valid and consistent.
249
     */
250
    sys_check_options();
251
    auth_check_options();
252
    for (i = 0; (protp = protocols[i]) != NULL; ++i)
253
	if (protp->check_options != NULL)
254
	    (*protp->check_options)();
255
    if (demand && connector == 0) {
256
	option_error("connect script required for demand-dialling\n");
257
	exit(1);
258
    }
259
260
    script_setenv("DEVICE", devnam);
261
    snprintf(numbuf, sizeof numbuf, "%d", baud_rate);
262
    script_setenv("SPEED", numbuf);
263
264
    /*
265
     * If the user has specified the default device name explicitly,
266
     * pretend they hadn't.
267
     */
268
    if (!default_device && strcmp(devnam, default_devnam) == 0)
269
	default_device = 1;
270
    if (default_device)
271
	nodetach = 1;
272
273
    /*
274
     * Initialize system-dependent stuff and magic number package.
275
     */
276
    sys_init();
277
    magic_init();
278
    if (debug)
279
	setlogmask(LOG_UPTO(LOG_DEBUG));
280
281
    /*
282
     * Detach ourselves from the terminal, if required,
283
     * and identify who is running us.
284
     */
285
    if (nodetach == 0)
286
	detach();
287
    pid = getpid();
288
    p = getlogin();
289
    if (p == NULL) {
290
	pw = getpwuid(uid);
291
	if (pw != NULL && pw->pw_name != NULL)
292
	    p = pw->pw_name;
293
	else
294
	    p = "(unknown)";
295
    }
296
    syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %u",
297
	   VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
298
299
    /*
300
     * Compute mask of all interesting signals and install signal handlers
301
     * for each.  Only one signal handler may be active at a time.  Therefore,
302
     * all other signals should be masked when any handler is executing.
303
     */
304
    sigemptyset(&mask);
305
    sigaddset(&mask, SIGHUP);
306
    sigaddset(&mask, SIGINT);
307
    sigaddset(&mask, SIGTERM);
308
    sigaddset(&mask, SIGCHLD);
309
310
#define SIGNAL(s, handler)	{ \
311
	sa.sa_handler = handler; \
312
	if (sigaction(s, &sa, NULL) < 0) { \
313
	    syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
314
	    die(1); \
315
	} \
316
    }
317
318
    sa.sa_mask = mask;
319
    sa.sa_flags = 0;
320
    SIGNAL(SIGHUP, hup);		/* Hangup */
321
    SIGNAL(SIGINT, term);		/* Interrupt */
322
    SIGNAL(SIGTERM, term);		/* Terminate */
323
    SIGNAL(SIGCHLD, chld);
324
325
    SIGNAL(SIGUSR1, toggle_debug);	/* Toggle debug flag */
326
    SIGNAL(SIGUSR2, open_ccp);		/* Reopen CCP */
327
328
    /*
329
     * Install a handler for other signals which would otherwise
330
     * cause pppd to exit without cleaning up.
331
     */
332
    SIGNAL(SIGABRT, bad_signal);
333
    SIGNAL(SIGALRM, bad_signal);
334
    SIGNAL(SIGFPE, bad_signal);
335
    SIGNAL(SIGILL, bad_signal);
336
    SIGNAL(SIGPIPE, bad_signal);
337
    SIGNAL(SIGQUIT, bad_signal);
338
#if SIGSEGV_CHECK
339
    SIGNAL(SIGSEGV, bad_signal);
340
#endif
341
#ifdef SIGBUS
342
    SIGNAL(SIGBUS, bad_signal);
343
#endif
344
#ifdef SIGEMT
345
    SIGNAL(SIGEMT, bad_signal);
346
#endif
347
#ifdef SIGPOLL
348
    SIGNAL(SIGPOLL, bad_signal);
349
#endif
350
#ifdef SIGPROF
351
    SIGNAL(SIGPROF, bad_signal);
352
#endif
353
#ifdef SIGSYS
354
    SIGNAL(SIGSYS, bad_signal);
355
#endif
356
#ifdef SIGTRAP
357
    SIGNAL(SIGTRAP, bad_signal);
358
#endif
359
#ifdef SIGVTALRM
360
    SIGNAL(SIGVTALRM, bad_signal);
361
#endif
362
#ifdef SIGXCPU
363
    SIGNAL(SIGXCPU, bad_signal);
364
#endif
365
#ifdef SIGXFSZ
366
    SIGNAL(SIGXFSZ, bad_signal);
367
#endif
368
369
    /*
370
     * Apparently we can get a SIGPIPE when we call syslog, if
371
     * syslogd has died and been restarted.  Ignoring it seems
372
     * be sufficient.
373
     */
374
    signal(SIGPIPE, SIG_IGN);
375
376
    /*
377
     * If we're doing dial-on-demand, set up the interface now.
378
     */
379
    if (demand) {
380
	/*
381
	 * Open the loopback channel and set it up to be the ppp interface.
382
	 */
383
	open_ppp_loopback();
384
385
	syslog(LOG_INFO, "Using interface ppp%d", ifunit);
386
	(void) snprintf(ifname, sizeof ifname, "ppp%d", ifunit);
387
	script_setenv("IFNAME", ifname);
388
389
	/*
390
	 * Configure the interface and mark it up, etc.
391
	 */
392
	demand_conf();
393
    }
394
395
    for (;;) {
396
397
	need_holdoff = 1;
398
399
	if (demand) {
400
	    /*
401
	     * Don't do anything until we see some activity.
402
	     */
403
	    phase = PHASE_DORMANT;
404
	    kill_link = 0;
405
	    demand_unblock();
406
	    for (;;) {
407
		wait_loop_output(timeleft(&timo));
408
		calltimeout();
409
		if (kill_link) {
410
		    if (!persist)
411
			die(0);
412
		    kill_link = 0;
413
		}
414
		if (get_loop_output())
415
		    break;
416
		reap_kids();
417
	    }
418
419
	    /*
420
	     * Now we want to bring up the link.
421
	     */
422
	    demand_drop();
423
	    syslog(LOG_INFO, "Starting link");
424
	}
425
426
	/*
427
	 * Lock the device if we've been asked to.
428
	 */
429
	if (lockflag && !default_device) {
430
	    if (lock(devnam) < 0)
431
		goto fail;
432
	    locked = 1;
433
	}
434
435
	/*
436
	 * Open the serial device and set it up to be the ppp interface.
437
	 * First we open it in non-blocking mode so we can set the
438
	 * various termios flags appropriately.  If we aren't dialling
439
	 * out and we want to use the modem lines, we reopen it later
440
	 * in order to wait for the carrier detect signal from the modem.
441
	 */
442
	while ((ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0)) < 0) {
443
	    if (errno != EINTR)
444
		syslog(LOG_ERR, "Failed to open %s: %m", devnam);
445
	    if (!persist || errno != EINTR)
446
		goto fail;
447
	}
448
	if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
449
	    || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
450
	    syslog(LOG_WARNING,
451
		   "Couldn't reset non-blocking mode on device: %m");
452
453
	hungup = 0;
454
	kill_link = 0;
455
456
	/*
457
	 * Do the equivalent of `mesg n' to stop broadcast messages.
458
	 */
459
	if (fstat(ttyfd, &statbuf) < 0
460
	    || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
461
	    syslog(LOG_WARNING,
462
		   "Couldn't restrict write permissions to %s: %m", devnam);
463
	} else
464
	    tty_mode = statbuf.st_mode;
465
466
	/* run connection script */
467
	if (connector && connector[0]) {
468
	    MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
469
470
	    /*
471
	     * Set line speed, flow control, etc.
472
	     * On most systems we set CLOCAL for now so that we can talk
473
	     * to the modem before carrier comes up.  But this has the
474
	     * side effect that we might miss it if CD drops before we
475
	     * get to clear CLOCAL below.  On systems where we can talk
476
	     * successfully to the modem with CLOCAL clear and CD down,
477
	     * we can clear CLOCAL at this point.
478
	     */
479
	    set_up_tty(ttyfd, (modem_chat == 0));
480
481
	    /* drop dtr to hang up in case modem is off hook */
482
	    if (!default_device && modem) {
483
		setdtr(ttyfd, FALSE);
484
		sleep(1);
485
		setdtr(ttyfd, TRUE);
486
	    }
487
488
	    if (device_script(connector, ttyfd, ttyfd) < 0) {
489
		syslog(LOG_ERR, "Connect script failed");
490
		setdtr(ttyfd, FALSE);
491
		goto fail;
492
	    }
493
494
	    syslog(LOG_INFO, "Serial connection established.");
495
	    sleep(1);		/* give it time to set up its terminal */
496
	}
497
498
	set_up_tty(ttyfd, 0);
499
500
	/* reopen tty if necessary to wait for carrier */
501
	if (connector == NULL && modem) {
502
	    while ((i = open(devnam, O_RDWR)) < 0) {
503
		if (errno != EINTR)
504
		    syslog(LOG_ERR, "Failed to reopen %s: %m", devnam);
505
		if (!persist || errno != EINTR || hungup || kill_link)
506
		    goto fail;
507
	    }
508
	    close(i);
509
	}
510
511
	/* run welcome script, if any */
512
	if (welcomer && welcomer[0]) {
513
	    if (device_script(welcomer, ttyfd, ttyfd) < 0)
514
		syslog(LOG_WARNING, "Welcome script failed");
515
	}
516
517
	/* set up the serial device as a ppp interface */
518
	establish_ppp(ttyfd);
519
520
	if (!demand) {
521
522
	    syslog(LOG_INFO, "Using interface ppp%d", ifunit);
523
	    (void) snprintf(ifname, sizeof ifname, "ppp%d", ifunit);
524
	    script_setenv("IFNAME", ifname);
525
	}
526
527
	/*
528
	 * Start opening the connection and wait for
529
	 * incoming events (reply, timeout, etc.).
530
	 */
531
	syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
532
	lcp_lowerup(0);
533
	lcp_open(0);		/* Start protocol */
534
	for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
535
	    wait_input(timeleft(&timo));
536
	    calltimeout();
537
	    get_input();
538
	    if (kill_link) {
539
		lcp_close(0, "User request");
540
		kill_link = 0;
541
	    }
542
	    if (open_ccp_flag) {
543
		if (phase == PHASE_NETWORK) {
544
		    ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
545
		    (*ccp_protent.open)(0);
546
		}
547
		open_ccp_flag = 0;
548
	    }
549
	    reap_kids();	/* Don't leave dead kids lying around */
550
	}
551
552
	/*
553
	 * If we may want to bring the link up again, transfer
554
	 * the ppp unit back to the loopback.  Set the
555
	 * real serial device back to its normal mode of operation.
556
	 */
557
	clean_check();
558
	if (demand)
559
	    restore_loop();
560
	disestablish_ppp(ttyfd);
561
562
	/*
563
	 * Run disconnector script, if requested.
564
	 * XXX we may not be able to do this if the line has hung up!
565
	 */
566
	if (disconnector && !hungup) {
567
	    set_up_tty(ttyfd, 1);
568
	    if (device_script(disconnector, ttyfd, ttyfd) < 0) {
569
		syslog(LOG_WARNING, "disconnect script failed");
570
	    } else {
571
		syslog(LOG_INFO, "Serial link disconnected.");
572
	    }
573
	}
574
575
    fail:
576
	if (ttyfd >= 0)
577
	    close_tty();
578
	if (locked) {
579
	    unlock();
580
	    locked = 0;
581
	}
582
583
	if (!persist)
584
	    die(1);
585
586
	if (holdoff > 0 && need_holdoff) {
587
	    phase = PHASE_HOLDOFF;
588
	    TIMEOUT(holdoff_end, NULL, holdoff);
589
	    do {
590
		wait_time(timeleft(&timo));
591
		calltimeout();
592
		if (kill_link) {
593
		    if (!persist)
594
			die(0);
595
		    kill_link = 0;
596
		    phase = PHASE_DORMANT; /* allow signal to end holdoff */
597
		}
598
		reap_kids();
599
	    } while (phase == PHASE_HOLDOFF);
600
	}
601
    }
602
603
    die(0);
604
    return 0;
605
}
606
607
/*
608
 * detach - detach us from the controlling terminal.
609
 */
610
void
611
detach()
612
{
613
    if (detached)
614
	return;
615
    if (daemon(0, 0) < 0) {
616
	perror("Couldn't detach from controlling terminal");
617
	die(1);
618
    }
619
    detached = 1;
620
    pid = getpid();
621
}
622
623
/*
624
 * holdoff_end - called via a timeout when the holdoff period ends.
625
 */
626
static void
627
holdoff_end(arg)
628
    void *arg;
629
{
630
    phase = PHASE_DORMANT;
631
}
632
633
/*
634
 * get_input - called when incoming data is available.
635
 */
636
static void
637
get_input()
638
{
639
    int len, i;
640
    u_char *p;
641
    u_short protocol;
642
    struct protent *protp;
643
644
    p = inpacket_buf;	/* point to beginning of packet buffer */
645
646
    len = read_packet(inpacket_buf);
647
    if (len < 0)
648
	return;
649
650
    if (len == 0) {
651
	syslog(LOG_NOTICE, "Modem hangup");
652
	hungup = 1;
653
	lcp_lowerdown(0);	/* serial link is no longer available */
654
	link_terminated(0);
655
	return;
656
    }
657
658
    if (debug /*&& (debugflags & DBG_INPACKET)*/)
659
	log_packet(p, len, "rcvd ", LOG_DEBUG);
660
661
    if (len < PPP_HDRLEN) {
662
	MAINDEBUG((LOG_INFO, "io(): Received short packet."));
663
	return;
664
    }
665
666
    p += 2;				/* Skip address and control */
667
    GETSHORT(protocol, p);
668
    len -= PPP_HDRLEN;
669
670
    /*
671
     * Toss all non-LCP packets unless LCP is OPEN.
672
     */
673
    if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
674
	MAINDEBUG((LOG_INFO,
675
		   "get_input: Received non-LCP packet when LCP not open."));
676
	return;
677
    }
678
679
    /*
680
     * Until we get past the authentication phase, toss all packets
681
     * except LCP, LQR and authentication packets.
682
     */
683
    if (phase <= PHASE_AUTHENTICATE
684
	&& !(protocol == PPP_LCP || protocol == PPP_LQR
685
	|| protocol == PPP_PAP || protocol == PPP_CHAP)) {
686
	MAINDEBUG((LOG_INFO, "get_input: discarding proto 0x%x in phase %d",
687
		   protocol, phase));
688
	return;
689
    }
690
691
    /*
692
     * Upcall the proper protocol input routine.
693
     */
694
    for (i = 0; (protp = protocols[i]) != NULL; ++i) {
695
	if (protp->protocol == protocol && protp->enabled_flag) {
696
	    (*protp->input)(0, p, len);
697
	    return;
698
	}
699
	if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
700
	    && protp->datainput != NULL) {
701
	    (*protp->datainput)(0, p, len);
702
	    return;
703
	}
704
    }
705
706
    if (debug)
707
    	syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol);
708
    lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
709
}
710
711
712
/*
713
 * quit - Clean up state and exit (with an error indication).
714
 */
715
void
716
quit()
717
{
718
    die(1);
719
}
720
721
/*
722
 * die - like quit, except we can specify an exit status.
723
 */
724
void
725
die(status)
726
    int status;
727
{
728
    struct syslog_data sdata = SYSLOG_DATA_INIT;
729
730
    cleanup();
731
    syslog_r(LOG_INFO, &sdata, "Exit.");
732
    _exit(status);
733
}
734
735
/*
736
 * cleanup - restore anything which needs to be restored before we exit
737
 */
738
/* ARGSUSED */
739
static void
740
cleanup()
741
{
742
    sys_cleanup();
743
744
    if (ttyfd >= 0)
745
	close_tty();
746
747
    if (locked)
748
	unlock();
749
}
750
751
/*
752
 * close_tty - restore the terminal device and close it.
753
 */
754
static void
755
close_tty()
756
{
757
    disestablish_ppp(ttyfd);
758
759
    /* drop dtr to hang up */
760
    if (modem) {
761
	setdtr(ttyfd, FALSE);
762
	/*
763
	 * This sleep is in case the serial port has CLOCAL set by default,
764
	 * and consequently will reassert DTR when we close the device.
765
	 */
766
	sleep(1);
767
    }
768
769
    restore_tty(ttyfd);
770
771
    if (tty_mode != (mode_t) -1)
772
	fchmod(ttyfd, tty_mode);
773
774
    close(ttyfd);
775
    ttyfd = -1;
776
}
777
778
779
struct	callout {
780
    struct timeval	c_time;		/* time at which to call routine */
781
    void		*c_arg;		/* argument to routine */
782
    void		(*c_func)(void *); /* routine */
783
    struct		callout *c_next;
784
};
785
786
static struct callout *callout = NULL;	/* Callout list */
787
static struct timeval timenow;		/* Current time */
788
789
/*
790
 * timeout - Schedule a timeout.
791
 *
792
 * Note that this timeout takes the number of seconds, NOT hz (as in
793
 * the kernel).
794
 */
795
void
796
timeout(func, arg, time)
797
    void (*func)(void *);
798
    void *arg;
799
    int time;
800
{
801
    struct callout *newp, *p, **pp;
802
803
    MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
804
	       (long) func, (long) arg, time));
805
806
    /*
807
     * Allocate timeout.
808
     */
809
    if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
810
	syslog(LOG_ERR, "Out of memory in timeout()!");
811
	die(1);
812
    }
813
    newp->c_arg = arg;
814
    newp->c_func = func;
815
    gettimeofday(&timenow, NULL);
816
    newp->c_time.tv_sec = timenow.tv_sec + time;
817
    newp->c_time.tv_usec = timenow.tv_usec;
818
819
    /*
820
     * Find correct place and link it in.
821
     */
822
    for (pp = &callout; (p = *pp); pp = &p->c_next)
823
	if (newp->c_time.tv_sec < p->c_time.tv_sec
824
	    || (newp->c_time.tv_sec == p->c_time.tv_sec
825
		&& newp->c_time.tv_usec < p->c_time.tv_sec))
826
	    break;
827
    newp->c_next = p;
828
    *pp = newp;
829
}
830
831
832
/*
833
 * untimeout - Unschedule a timeout.
834
 */
835
void
836
untimeout(func, arg)
837
    void (*func)(void *);
838
    void *arg;
839
{
840
    struct callout **copp, *freep;
841
842
    MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
843
844
    /*
845
     * Find first matching timeout and remove it from the list.
846
     */
847
    for (copp = &callout; (freep = *copp); copp = &freep->c_next)
848
	if (freep->c_func == func && freep->c_arg == arg) {
849
	    *copp = freep->c_next;
850
	    (void) free((char *) freep);
851
	    break;
852
	}
853
}
854
855
856
/*
857
 * calltimeout - Call any timeout routines which are now due.
858
 */
859
static void
860
calltimeout()
861
{
862
    struct callout *p;
863
864
    while (callout != NULL) {
865
	p = callout;
866
867
	if (gettimeofday(&timenow, NULL) < 0) {
868
	    syslog(LOG_ERR, "Failed to get time of day: %m");
869
	    die(1);
870
	}
871
	if (!(p->c_time.tv_sec < timenow.tv_sec
872
	      || (p->c_time.tv_sec == timenow.tv_sec
873
		  && p->c_time.tv_usec <= timenow.tv_usec)))
874
	    break;		/* no, it's not time yet */
875
876
	callout = p->c_next;
877
	(*p->c_func)(p->c_arg);
878
879
	free((char *) p);
880
    }
881
}
882
883
884
/*
885
 * timeleft - return the length of time until the next timeout is due.
886
 */
887
static struct timeval *
888
timeleft(tvp)
889
    struct timeval *tvp;
890
{
891
    if (callout == NULL)
892
	return NULL;
893
894
    gettimeofday(&timenow, NULL);
895
    tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
896
    tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
897
    if (tvp->tv_usec < 0) {
898
	tvp->tv_usec += 1000000;
899
	tvp->tv_sec -= 1;
900
    }
901
    if (tvp->tv_sec < 0)
902
	tvp->tv_sec = tvp->tv_usec = 0;
903
904
    return tvp;
905
}
906
907
908
/*
909
 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
910
 */
911
static void
912
kill_my_pg(sig)
913
    int sig;
914
{
915
    struct sigaction act, oldact;
916
917
    act.sa_handler = SIG_IGN;
918
    act.sa_flags = 0;
919
    kill(0, sig);
920
    sigaction(sig, &act, &oldact);
921
    sigaction(sig, &oldact, NULL);
922
}
923
924
925
/*
926
 * hup - Catch SIGHUP signal.
927
 *
928
 * Indicates that the physical layer has been disconnected.
929
 * We don't rely on this indication; if the user has sent this
930
 * signal, we just take the link down.
931
 */
932
static void
933
hup(sig)
934
    int sig;
935
{
936
    int save_errno = errno;
937
    struct syslog_data sdata = SYSLOG_DATA_INIT;
938
939
    if (crashed)
940
	_exit(127);
941
    syslog_r(LOG_INFO, &sdata, "Hangup (SIGHUP)");
942
    kill_link = 1;
943
    if (conn_running)
944
	/* Send the signal to the [dis]connector process(es) also */
945
	kill_my_pg(sig);
946
    errno = save_errno;
947
}
948
949
950
/*
951
 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
952
 *
953
 * Indicates that we should initiate a graceful disconnect and exit.
954
 */
955
/*ARGSUSED*/
956
static void
957
term(sig)
958
    int sig;
959
{
960
    int save_errno = errno;
961
    struct syslog_data sdata = SYSLOG_DATA_INIT;
962
963
    if (crashed)
964
	_exit(127);
965
    syslog_r(LOG_INFO, &sdata, "Terminating on signal %d.", sig);
966
    persist = 0;		/* don't try to restart */
967
    kill_link = 1;
968
    if (conn_running)
969
	/* Send the signal to the [dis]connector process(es) also */
970
	kill_my_pg(sig);
971
    errno = save_errno;
972
}
973
974
975
/*
976
 * chld - Catch SIGCHLD signal.
977
 * Calls reap_kids to get status for any dead kids.
978
 */
979
static void
980
chld(sig)
981
    int sig;
982
{
983
    int save_errno = errno;
984
985
    reap_kids();		/* XXX somewhat unsafe */
986
    errno = save_errno;
987
}
988
989
990
/*
991
 * toggle_debug - Catch SIGUSR1 signal.
992
 *
993
 * Toggle debug flag.
994
 */
995
/*ARGSUSED*/
996
static void
997
toggle_debug(sig)
998
    int sig;
999
{
1000
    debug = !debug;
1001
    if (debug) {
1002
	setlogmask(LOG_UPTO(LOG_DEBUG));	/* XXX safe, but wrong */
1003
    } else {
1004
	setlogmask(LOG_UPTO(LOG_WARNING));	/* XXX safe, but wrong */
1005
    }
1006
}
1007
1008
1009
/*
1010
 * open_ccp - Catch SIGUSR2 signal.
1011
 *
1012
 * Try to (re)negotiate compression.
1013
 */
1014
/*ARGSUSED*/
1015
static void
1016
open_ccp(sig)
1017
    int sig;
1018
{
1019
    open_ccp_flag = 1;
1020
}
1021
1022
1023
/*
1024
 * bad_signal - We've caught a fatal signal.  Clean up state and exit.
1025
 */
1026
static void
1027
bad_signal(sig)
1028
    int sig;
1029
{
1030
    struct syslog_data sdata = SYSLOG_DATA_INIT;
1031
1032
    if (crashed)
1033
	_exit(127);
1034
    crashed = 1;
1035
    syslog_r(LOG_ERR, &sdata, "Fatal signal %d", sig);
1036
    if (conn_running)
1037
	kill_my_pg(SIGTERM);
1038
    die(1);					/* XXX unsafe! */
1039
}
1040
1041
1042
/*
1043
 * device_script - run a program to connect or disconnect the
1044
 * serial device.
1045
 */
1046
static int
1047
device_script(program, in, out)
1048
    char *program;
1049
    int in, out;
1050
{
1051
    pid_t pid;
1052
    int status;
1053
    int errfd;
1054
    gid_t gid;
1055
    uid_t uid;
1056
1057
    conn_running = 1;
1058
    pid = fork();
1059
1060
    if (pid < 0) {
1061
	conn_running = 0;
1062
	syslog(LOG_ERR, "Failed to create child process: %m");
1063
	die(1);
1064
    }
1065
1066
    if (pid == 0) {
1067
	sys_close();
1068
	closelog();
1069
	if (in == out) {
1070
	    if (in != 0) {
1071
		dup2(in, 0);
1072
		close(in);
1073
	    }
1074
	    dup2(0, 1);
1075
	} else {
1076
	    if (out == 0)
1077
		out = dup(out);
1078
	    if (in != 0) {
1079
		dup2(in, 0);
1080
		close(in);
1081
	    }
1082
	    if (out != 1) {
1083
		dup2(out, 1);
1084
		close(out);
1085
	    }
1086
	}
1087
	if (nodetach == 0) {
1088
	    close(2);
1089
	    errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1090
	    if (errfd >= 0 && errfd != 2) {
1091
		dup2(errfd, 2);
1092
		close(errfd);
1093
	    }
1094
	}
1095
1096
	/* revoke privs */
1097
	gid = getgid();
1098
	uid = getuid();
1099
	if (setresgid(gid, gid, gid) == -1 || setresuid(uid, uid, uid) == -1) {
1100
		syslog(LOG_ERR, "revoke privileges: %s", strerror(errno));
1101
		_exit(1);
1102
	}
1103
1104
	execl("/bin/sh", "sh", "-c", program, (char *)NULL);
1105
	syslog(LOG_ERR, "could not exec /bin/sh: %m");
1106
	_exit(99);
1107
	/* NOTREACHED */
1108
    }
1109
1110
    while (waitpid(pid, &status, 0) < 0) {
1111
	if (errno == EINTR)
1112
	    continue;
1113
	syslog(LOG_ERR, "error waiting for (dis)connection process: %m");
1114
	die(1);
1115
    }
1116
    conn_running = 0;
1117
1118
    return (status == 0 ? 0 : -1);
1119
}
1120
1121
1122
/*
1123
 * run-program - execute a program with given arguments,
1124
 * but don't wait for it.
1125
 * If the program can't be executed, logs an error unless
1126
 * must_exist is 0 and the program file doesn't exist.
1127
 */
1128
int
1129
run_program(prog, args, must_exist)
1130
    char *prog;
1131
    char **args;
1132
    int must_exist;
1133
{
1134
    pid_t pid;
1135
    uid_t uid;
1136
    gid_t gid;
1137
1138
    pid = fork();
1139
    if (pid == -1) {
1140
	syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
1141
	return -1;
1142
    }
1143
    if (pid == 0) {
1144
	int new_fd;
1145
1146
	/* Leave the current location */
1147
	(void) setsid();    /* No controlling tty. */
1148
	(void) umask (S_IRWXG|S_IRWXO);
1149
	(void) chdir ("/"); /* no current directory. */
1150
1151
	/* revoke privs */
1152
	uid = getuid();
1153
	gid = getgid();
1154
	if (setresgid(gid, gid, gid) == -1 || setresuid(uid, uid, uid) == -1) {
1155
		syslog(LOG_ERR, "revoke privileges: %s", strerror(errno));
1156
		_exit(1);
1157
	}
1158
1159
	/* Ensure that nothing of our device environment is inherited. */
1160
	sys_close();
1161
	closelog();
1162
	close (0);
1163
	close (1);
1164
	close (2);
1165
	close (ttyfd);  /* tty interface to the ppp device */
1166
1167
	/* Don't pass handles to the PPP device, even by accident. */
1168
	new_fd = open (_PATH_DEVNULL, O_RDWR);
1169
	if (new_fd >= 0) {
1170
	    if (new_fd != 0) {
1171
		dup2  (new_fd, 0); /* stdin <- /dev/null */
1172
		close (new_fd);
1173
	    }
1174
	    dup2 (0, 1); /* stdout -> /dev/null */
1175
	    dup2 (0, 2); /* stderr -> /dev/null */
1176
	}
1177
1178
	/* Force the priority back to zero if pppd is running higher. */
1179
	if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1180
	    syslog (LOG_WARNING, "can't reset priority to 0: %m");
1181
1182
	/* SysV recommends a second fork at this point. */
1183
1184
	/* run the program; give it a null environment */
1185
	execve(prog, args, script_env);
1186
	if (must_exist || errno != ENOENT)
1187
	    syslog(LOG_WARNING, "Can't execute %s: %m", prog);
1188
	_exit(1);
1189
    }
1190
    MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %ld", prog, (long)pid));
1191
    ++n_children;
1192
    return 0;
1193
}
1194
1195
1196
/*
1197
 * reap_kids - get status from any dead child processes,
1198
 * and log a message for abnormal terminations.
1199
 */
1200
static void
1201
reap_kids()
1202
{
1203
    int status;
1204
    pid_t pid;
1205
1206
    if (n_children == 0)
1207
	return;
1208
    if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
1209
	if (errno != ECHILD)
1210
	    syslog(LOG_ERR, "Error waiting for child process: %m");
1211
	return;
1212
    }
1213
    if (pid > 0) {
1214
	--n_children;
1215
	if (WIFSIGNALED(status)) {
1216
	    syslog(LOG_WARNING, "Child process %ld terminated with signal %d",
1217
		   (long)pid, WTERMSIG(status));
1218
	}
1219
    }
1220
}
1221
1222
1223
/*
1224
 * log_packet - format a packet and log it.
1225
 */
1226
1227
char line[256];			/* line to be logged accumulated here */
1228
char *linep;
1229
1230
void
1231
log_packet(p, len, prefix, level)
1232
    u_char *p;
1233
    int len;
1234
    char *prefix;
1235
    int level;
1236
{
1237
    strlcpy(line, prefix, sizeof line);
1238
    linep = line + strlen(line);
1239
    format_packet(p, len, pr_log, NULL);
1240
    if (linep != line)
1241
	syslog(level, "%s", line);
1242
}
1243
1244
/*
1245
 * format_packet - make a readable representation of a packet,
1246
 * calling `printer(arg, format, ...)' to output it.
1247
 */
1248
void
1249
format_packet(p, len, printer, arg)
1250
    u_char *p;
1251
    int len;
1252
    void (*printer)(void *, char *, ...);
1253
    void *arg;
1254
{
1255
    int i, n;
1256
    u_short proto;
1257
    u_char x;
1258
    struct protent *protp;
1259
1260
    if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
1261
	p += 2;
1262
	GETSHORT(proto, p);
1263
	len -= PPP_HDRLEN;
1264
	for (i = 0; (protp = protocols[i]) != NULL; ++i)
1265
	    if (proto == protp->protocol)
1266
		break;
1267
	if (protp != NULL) {
1268
	    printer(arg, "[%s", protp->name);
1269
	    n = (*protp->printpkt)(p, len, printer, arg);
1270
	    printer(arg, "]");
1271
	    p += n;
1272
	    len -= n;
1273
	} else {
1274
	    printer(arg, "[proto=0x%x]", proto);
1275
	}
1276
    }
1277
1278
    for (; len > 0; --len) {
1279
	GETCHAR(x, p);
1280
	printer(arg, " %.2x", x);
1281
    }
1282
}
1283
1284
static void
1285
pr_log(void *arg, char *fmt, ...)
1286
{
1287
    int n;
1288
    va_list pvar;
1289
    char buf[256];
1290
1291
    va_start(pvar, fmt);
1292
1293
    n = vfmtmsg(buf, sizeof(buf), fmt, pvar);
1294
    va_end(pvar);
1295
1296
    if (linep + n + 1 > line + sizeof(line)) {
1297
	syslog(LOG_DEBUG, "%s", line);
1298
	linep = line;
1299
    }
1300
    strlcpy(linep, buf, line + sizeof line - linep);
1301
    linep += n;
1302
}
1303
1304
/*
1305
 * print_string - print a readable representation of a string using
1306
 * printer.
1307
 */
1308
void
1309
print_string(p, len, printer, arg)
1310
    char *p;
1311
    int len;
1312
    void (*printer)(void *, char *, ...);
1313
    void *arg;
1314
{
1315
    int c;
1316
1317
    printer(arg, "\"");
1318
    for (; len > 0; --len) {
1319
	c = *p++;
1320
	if (' ' <= c && c <= '~') {
1321
	    if (c == '\\' || c == '"')
1322
		printer(arg, "\\");
1323
	    printer(arg, "%c", c);
1324
	} else {
1325
	    switch (c) {
1326
	    case '\n':
1327
		printer(arg, "\\n");
1328
		break;
1329
	    case '\r':
1330
		printer(arg, "\\r");
1331
		break;
1332
	    case '\t':
1333
		printer(arg, "\\t");
1334
		break;
1335
	    default:
1336
		printer(arg, "\\%.3o", c);
1337
	    }
1338
	}
1339
    }
1340
    printer(arg, "\"");
1341
}
1342
1343
/*
1344
 * novm - log an error message saying we ran out of memory, and die.
1345
 */
1346
void
1347
novm(msg)
1348
    char *msg;
1349
{
1350
    syslog(LOG_ERR, "Virtual memory exhausted allocating %s", msg);
1351
    die(1);
1352
}
1353
1354
/*
1355
 * fmtmsg - format a message into a buffer.  Like snprintf except we
1356
 * also specify the length of the output buffer, and we handle
1357
 * %m (error message) and %I (IP address) formats.
1358
 * Doesn't do floating-point formats.
1359
 * Returns the number of chars put into buf.
1360
 */
1361
int
1362
fmtmsg(char *buf, int buflen, char *fmt, ...)
1363
{
1364
    va_list args;
1365
    int n;
1366
1367
    va_start(args, fmt);
1368
    n = vfmtmsg(buf, buflen, fmt, args);
1369
    va_end(args);
1370
    return n;
1371
}
1372
1373
/*
1374
 * vfmtmsg - like fmtmsg, takes a va_list instead of a list of args.
1375
 */
1376
#define OUTCHAR(c)	(buflen > 0? (--buflen, *buf++ = (c)): 0)
1377
1378
int
1379
vfmtmsg(buf, buflen, fmt, args)
1380
    char *buf;
1381
    int buflen;
1382
    char *fmt;
1383
    va_list args;
1384
{
1385
    int c, i, n;
1386
    int width, prec, fillch;
1387
    int base, len, neg, quoted;
1388
    unsigned long val = 0;
1389
    char *str, *f, *buf0;
1390
    unsigned char *p;
1391
    char num[32];
1392
    time_t t;
1393
    static char hexchars[] = "0123456789abcdef";
1394
1395
    buf0 = buf;
1396
    --buflen;
1397
    while (buflen > 0) {
1398
	for (f = fmt; *f != '%' && *f != 0; ++f)
1399
	    ;
1400
	if (f > fmt) {
1401
	    len = f - fmt;
1402
	    if (len > buflen)
1403
		len = buflen;
1404
	    memcpy(buf, fmt, len);
1405
	    buf += len;
1406
	    buflen -= len;
1407
	    fmt = f;
1408
	}
1409
	if (*fmt == 0)
1410
	    break;
1411
	c = *++fmt;
1412
	width = prec = 0;
1413
	fillch = ' ';
1414
	if (c == '0') {
1415
	    fillch = '0';
1416
	    c = *++fmt;
1417
	}
1418
	if (c == '*') {
1419
	    width = va_arg(args, int);
1420
	    c = *++fmt;
1421
	} else {
1422
	    while (isdigit(c)) {
1423
		width = width * 10 + c - '0';
1424
		c = *++fmt;
1425
	    }
1426
	}
1427
	if (c == '.') {
1428
	    c = *++fmt;
1429
	    if (c == '*') {
1430
		prec = va_arg(args, int);
1431
		c = *++fmt;
1432
	    } else {
1433
		while (isdigit(c)) {
1434
		    prec = prec * 10 + c - '0';
1435
		    c = *++fmt;
1436
		}
1437
	    }
1438
	}
1439
	str = 0;
1440
	base = 0;
1441
	neg = 0;
1442
	++fmt;
1443
	switch (c) {
1444
	case 'd':
1445
	    i = va_arg(args, int);
1446
	    if (i < 0) {
1447
		neg = 1;
1448
		val = -i;
1449
	    } else
1450
		val = i;
1451
	    base = 10;
1452
	    break;
1453
	case 'o':
1454
	    val = va_arg(args, unsigned int);
1455
	    base = 8;
1456
	    break;
1457
	case 'x':
1458
	    val = va_arg(args, unsigned int);
1459
	    base = 16;
1460
	    break;
1461
	case 'p':
1462
	    val = (unsigned long) va_arg(args, void *);
1463
	    base = 16;
1464
	    neg = 2;
1465
	    break;
1466
	case 's':
1467
	    str = va_arg(args, char *);
1468
	    break;
1469
	case 'c':
1470
	    num[0] = va_arg(args, int);
1471
	    num[1] = 0;
1472
	    str = num;
1473
	    break;
1474
	case 'm':
1475
	    str = strerror(errno);
1476
	    break;
1477
	case 'I':
1478
	    str = ip_ntoa(va_arg(args, u_int32_t));
1479
	    break;
1480
	case 't':
1481
	    time(&t);
1482
	    str = ctime(&t);
1483
	    str += 4;		/* chop off the day name */
1484
	    str[15] = 0;	/* chop off year and newline */
1485
	    break;
1486
	case 'v':		/* "visible" string */
1487
	case 'q':		/* quoted string */
1488
	    quoted = c == 'q';
1489
	    p = va_arg(args, unsigned char *);
1490
	    if (fillch == '0' && prec > 0) {
1491
		n = prec;
1492
	    } else {
1493
		n = strlen((char *)p);
1494
		if (prec > 0 && prec < n)
1495
		    n = prec;
1496
	    }
1497
	    while (n > 0 && buflen > 0) {
1498
		c = *p++;
1499
		--n;
1500
		if (!quoted && c >= 0x80) {
1501
		    OUTCHAR('M');
1502
		    OUTCHAR('-');
1503
		    c -= 0x80;
1504
		}
1505
		if (quoted && (c == '"' || c == '\\'))
1506
		    OUTCHAR('\\');
1507
		if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
1508
		    if (quoted) {
1509
			OUTCHAR('\\');
1510
			switch (c) {
1511
			case '\t':	OUTCHAR('t');	break;
1512
			case '\n':	OUTCHAR('n');	break;
1513
			case '\b':	OUTCHAR('b');	break;
1514
			case '\f':	OUTCHAR('f');	break;
1515
			default:
1516
			    OUTCHAR('x');
1517
			    OUTCHAR(hexchars[c >> 4]);
1518
			    OUTCHAR(hexchars[c & 0xf]);
1519
			}
1520
		    } else {
1521
			if (c == '\t')
1522
			    OUTCHAR(c);
1523
			else {
1524
			    OUTCHAR('^');
1525
			    OUTCHAR(c ^ 0x40);
1526
			}
1527
		    }
1528
		} else
1529
		    OUTCHAR(c);
1530
	    }
1531
	    continue;
1532
	default:
1533
	    *buf++ = '%';
1534
	    if (c != '%')
1535
		--fmt;		/* so %z outputs %z etc. */
1536
	    --buflen;
1537
	    continue;
1538
	}
1539
	if (base != 0) {
1540
	    str = num + sizeof(num);
1541
	    *--str = 0;
1542
	    while (str > num + neg) {
1543
		*--str = hexchars[val % base];
1544
		val = val / base;
1545
		if (--prec <= 0 && val == 0)
1546
		    break;
1547
	    }
1548
	    switch (neg) {
1549
	    case 1:
1550
		*--str = '-';
1551
		break;
1552
	    case 2:
1553
		*--str = 'x';
1554
		*--str = '0';
1555
		break;
1556
	    }
1557
	    len = num + sizeof(num) - 1 - str;
1558
	} else {
1559
	    len = strlen(str);
1560
	    if (prec > 0 && len > prec)
1561
		len = prec;
1562
	}
1563
	if (width > 0) {
1564
	    if (width > buflen)
1565
		width = buflen;
1566
	    if ((n = width - len) > 0) {
1567
		buflen -= n;
1568
		for (; n > 0; --n)
1569
		    *buf++ = fillch;
1570
	    }
1571
	}
1572
	if (len > buflen)
1573
	    len = buflen;
1574
	memcpy(buf, str, len);
1575
	buf += len;
1576
	buflen -= len;
1577
    }
1578
    *buf = 0;
1579
    return buf - buf0;
1580
}
1581
1582
/*
1583
 * script_setenv - set an environment variable value to be used
1584
 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1585
 */
1586
void
1587
script_setenv(var, value)
1588
    char *var, *value;
1589
{
1590
    int vl = strlen(var);
1591
    int i;
1592
    char *p, *newstring;
1593
1594
    if (asprintf(&newstring, "%s=%s", var, value) == -1)
1595
	novm("script_setenv");
1596
1597
    /* check if this variable is already set */
1598
    if (script_env != 0) {
1599
	for (i = 0; (p = script_env[i]) != 0; ++i) {
1600
	    if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1601
		free(p);
1602
		script_env[i] = newstring;
1603
		return;
1604
	    }
1605
	}
1606
    } else {
1607
	i = 0;
1608
	script_env = (char **) calloc(16, sizeof(char *));
1609
	if (script_env == 0)
1610
	    novm("script_setenv");
1611
	s_env_nalloc = 16;
1612
    }
1613
1614
    /* reallocate script_env with more space if needed */
1615
    if (i + 1 >= s_env_nalloc) {
1616
	int new_n = i + 17;
1617
	char **newenv = reallocarray(script_env,
1618
	    new_n, sizeof(char *));
1619
	if (newenv == 0)
1620
	    novm("script_setenv");
1621
	script_env = newenv;
1622
	s_env_nalloc = new_n;
1623
    }
1624
1625
    script_env[i] = newstring;
1626
    script_env[i+1] = 0;
1627
}