1/*
2 * System-dependent procedures for pppd under SunOS 4.
3 *
4 * Copyright (c) 1994 The Australian National University.
5 * All rights reserved.
6 *
7 * Permission to use, copy, modify, and distribute this software and its
8 * documentation is hereby granted, provided that the above copyright
9 * notice appears in all copies.  This software is provided without any
10 * warranty, express or implied. The Australian National University
11 * makes no representations about the suitability of this software for
12 * any purpose.
13 *
14 * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
15 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
17 * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
18 * OF SUCH DAMAGE.
19 *
20 * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
21 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
22 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
23 * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
24 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
25 * OR MODIFICATIONS.
26 */
27
28#define RCSID	"$Id: sys-sunos4.c,v 1.1.1.1 2008/10/15 03:30:13 james26_jang Exp $"
29
30#include <stdio.h>
31#include <stddef.h>
32#include <stdlib.h>
33#include <string.h>
34#include <ctype.h>
35#include <errno.h>
36#include <fcntl.h>
37#include <unistd.h>
38#include <termios.h>
39#include <signal.h>
40#include <malloc.h>
41#include <utmp.h>
42#include <sys/types.h>
43#include <sys/param.h>
44#include <sys/socket.h>
45#include <sys/sockio.h>
46#include <sys/stream.h>
47#include <sys/stropts.h>
48#include <sys/stat.h>
49#include <sys/time.h>
50#include <sys/poll.h>
51#include <net/if.h>
52#include <net/if_arp.h>
53#include <net/nit_if.h>
54#include <net/route.h>
55#include <net/ppp_defs.h>
56#include <net/pppio.h>
57#include <netinet/in.h>
58
59#include "pppd.h"
60
61#if defined(sun) && defined(sparc)
62#include <alloca.h>
63#ifndef __GNUC__
64extern void *alloca();
65#endif
66#endif /*sparc*/
67
68static const char rcsid[] = RCSID;
69
70static int	pppfd;
71static int	fdmuxid = -1;
72static int	iffd;
73static int	sockfd;
74
75static int	restore_term;
76static struct termios inittermios;
77static struct winsize wsinfo;	/* Initial window size info */
78static pid_t	parent_pid;	/* PID of our parent */
79
80extern u_char	inpacket_buf[];	/* borrowed from main.c */
81
82#define MAX_POLLFDS	32
83static struct pollfd pollfds[MAX_POLLFDS];
84static int n_pollfds;
85
86static int	link_mtu, link_mru;
87
88#define NMODULES	32
89static int	tty_nmodules;
90static char	tty_modules[NMODULES][FMNAMESZ+1];
91
92static int	if_is_up;	/* Interface has been marked up */
93static u_int32_t ifaddrs[2];	/* local and remote addresses */
94static u_int32_t default_route_gateway;	/* Gateway for default route added */
95static u_int32_t proxy_arp_addr;	/* Addr for proxy arp entry added */
96
97/* Prototypes for procedures local to this file. */
98static int translate_speed __P((int));
99static int baud_rate_of __P((int));
100static int get_ether_addr __P((u_int32_t, struct sockaddr *));
101static int strioctl __P((int, int, void *, int, int));
102
103
104/*
105 * sys_init - System-dependent initialization.
106 */
107void
108sys_init()
109{
110    int x;
111
112    /* Get an internet socket for doing socket ioctl's on. */
113    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
114	fatal("Couldn't create IP socket: %m");
115
116    /*
117     * We may want to send a SIGHUP to the session leader associated
118     * with our controlling terminal later.  Because SunOS doesn't
119     * have getsid(), we make do with sending the signal to our
120     * parent process.
121     */
122    parent_pid = getppid();
123
124    /*
125     * Open the ppp device.
126     */
127    pppfd = open("/dev/ppp", O_RDWR | O_NONBLOCK, 0);
128    if (pppfd < 0)
129	fatal("Can't open /dev/ppp: %m");
130    if (kdebugflag) {
131	x = PPPDBG_LOG + PPPDBG_DRIVER;
132	strioctl(pppfd, PPPIO_DEBUG, &x, sizeof(int), 0);
133    }
134
135    /* Assign a new PPA and get its unit number. */
136    if (strioctl(pppfd, PPPIO_NEWPPA, &ifunit, 0, sizeof(int)) < 0)
137	fatal("Can't create new PPP interface: %m");
138
139    /*
140     * Open the ppp device again and push the if_ppp module on it.
141     */
142    iffd = open("/dev/ppp", O_RDWR, 0);
143    if (iffd < 0)
144	fatal("Can't open /dev/ppp (2): %m");
145    if (kdebugflag) {
146	x = PPPDBG_LOG + PPPDBG_DRIVER;
147	strioctl(iffd, PPPIO_DEBUG, &x, sizeof(int), 0);
148    }
149    if (strioctl(iffd, PPPIO_ATTACH, &ifunit, sizeof(int), 0) < 0)
150	fatal("Couldn't attach ppp interface to device: %m");
151    if (ioctl(iffd, I_PUSH, "if_ppp") < 0)
152	fatal("Can't push ppp interface module: %m");
153    if (kdebugflag) {
154	x = PPPDBG_LOG + PPPDBG_IF;
155	strioctl(iffd, PPPIO_DEBUG, &x, sizeof(int), 0);
156    }
157    if (strioctl(iffd, PPPIO_NEWPPA, &ifunit, sizeof(int), 0) < 0)
158	fatal("Couldn't create ppp interface unit: %m");
159    x = PPP_IP;
160    if (strioctl(iffd, PPPIO_BIND, &x, sizeof(int), 0) < 0)
161	fatal("Couldn't bind ppp interface to IP SAP: %m");
162
163    n_pollfds = 0;
164}
165
166/*
167 * sys_cleanup - restore any system state we modified before exiting:
168 * mark the interface down, delete default route and/or proxy arp entry.
169 * This shouldn't call die() because it's called from die().
170 */
171void
172sys_cleanup()
173{
174    if (if_is_up)
175	sifdown(0);
176    if (ifaddrs[0])
177	cifaddr(0, ifaddrs[0], ifaddrs[1]);
178    if (default_route_gateway)
179	cifdefaultroute(0, 0, default_route_gateway);
180    if (proxy_arp_addr)
181	cifproxyarp(0, proxy_arp_addr);
182}
183
184/*
185 * sys_close - Clean up in a child process before execing.
186 */
187void
188sys_close()
189{
190    close(iffd);
191    close(pppfd);
192    close(sockfd);
193}
194
195/*
196 * sys_check_options - check the options that the user specified
197 */
198int
199sys_check_options()
200{
201    return 1;
202}
203
204
205/*
206 * ppp_available - check whether the system has any ppp interfaces
207 */
208int
209ppp_available()
210{
211    struct stat buf;
212
213    return stat("/dev/ppp", &buf) >= 0;
214}
215
216/*
217 * tty_establish_ppp - Turn the serial port into a ppp interface.
218 */
219int
220tty_establish_ppp(fd)
221    int fd;
222{
223    int i;
224
225    /* Pop any existing modules off the tty stream. */
226    for (i = 0;; ++i)
227	if (ioctl(fd, I_LOOK, tty_modules[i]) < 0
228	    || ioctl(fd, I_POP, 0) < 0)
229	    break;
230    tty_nmodules = i;
231
232    /* Push the async hdlc module and the compressor module. */
233    if (ioctl(fd, I_PUSH, "ppp_ahdl") < 0)
234	fatal("Couldn't push PPP Async HDLC module: %m");
235    if (ioctl(fd, I_PUSH, "ppp_comp") < 0)
236	error("Couldn't push PPP compression module: %m");
237
238    /* Link the serial port under the PPP multiplexor. */
239    if ((fdmuxid = ioctl(pppfd, I_LINK, fd)) < 0)
240	fatal("Can't link tty to PPP mux: %m");
241
242    return pppfd;
243}
244
245/*
246 * disestablish_ppp - Restore the serial port to normal operation.
247 * It attempts to reconstruct the stream with the previously popped
248 * modules.  This shouldn't call die() because it's called from die().
249 */
250void
251tty_disestablish_ppp(fd)
252    int fd;
253{
254    int i;
255
256    if (fdmuxid >= 0) {
257	if (ioctl(pppfd, I_UNLINK, fdmuxid) < 0) {
258	    if (!hungup)
259		error("Can't unlink tty from PPP mux: %m");
260	}
261	fdmuxid = -1;
262
263	if (!hungup) {
264	    while (ioctl(fd, I_POP, 0) >= 0)
265		;
266	    for (i = tty_nmodules - 1; i >= 0; --i)
267		if (ioctl(fd, I_PUSH, tty_modules[i]) < 0)
268		    error("Couldn't restore tty module %s: %m",
269			   tty_modules[i]);
270	}
271	if (hungup && default_device && parent_pid > 0) {
272	    /*
273	     * If we have received a hangup, we need to send a SIGHUP
274	     * to the terminal's controlling process.  The reason is
275	     * that the original stream head for the terminal hasn't
276	     * seen the M_HANGUP message (it went up through the ppp
277	     * driver to the stream head for our fd to /dev/ppp).
278	     * Actually we send the signal to the process that invoked
279	     * pppd, since SunOS doesn't have getsid().
280	     */
281	    kill(parent_pid, SIGHUP);
282	}
283    }
284}
285
286/*
287 * Check whether the link seems not to be 8-bit clean.
288 */
289void
290clean_check()
291{
292    int x;
293    char *s;
294
295    if (strioctl(pppfd, PPPIO_GCLEAN, &x, 0, sizeof(x)) < 0)
296	return;
297    s = NULL;
298    switch (~x) {
299    case RCV_B7_0:
300	s = "bit 7 set to 1";
301	break;
302    case RCV_B7_1:
303	s = "bit 7 set to 0";
304	break;
305    case RCV_EVNP:
306	s = "odd parity";
307	break;
308    case RCV_ODDP:
309	s = "even parity";
310	break;
311    }
312    if (s != NULL) {
313	warn("Serial link is not 8-bit clean:");
314	warn("All received characters had %s", s);
315    }
316}
317
318/*
319 * List of valid speeds.
320 */
321struct speed {
322    int speed_int, speed_val;
323} speeds[] = {
324#ifdef B50
325    { 50, B50 },
326#endif
327#ifdef B75
328    { 75, B75 },
329#endif
330#ifdef B110
331    { 110, B110 },
332#endif
333#ifdef B134
334    { 134, B134 },
335#endif
336#ifdef B150
337    { 150, B150 },
338#endif
339#ifdef B200
340    { 200, B200 },
341#endif
342#ifdef B300
343    { 300, B300 },
344#endif
345#ifdef B600
346    { 600, B600 },
347#endif
348#ifdef B1200
349    { 1200, B1200 },
350#endif
351#ifdef B1800
352    { 1800, B1800 },
353#endif
354#ifdef B2000
355    { 2000, B2000 },
356#endif
357#ifdef B2400
358    { 2400, B2400 },
359#endif
360#ifdef B3600
361    { 3600, B3600 },
362#endif
363#ifdef B4800
364    { 4800, B4800 },
365#endif
366#ifdef B7200
367    { 7200, B7200 },
368#endif
369#ifdef B9600
370    { 9600, B9600 },
371#endif
372#ifdef B19200
373    { 19200, B19200 },
374#endif
375#ifdef B38400
376    { 38400, B38400 },
377#endif
378#ifdef EXTA
379    { 19200, EXTA },
380#endif
381#ifdef EXTB
382    { 38400, EXTB },
383#endif
384#ifdef B57600
385    { 57600, B57600 },
386#endif
387#ifdef B115200
388    { 115200, B115200 },
389#endif
390    { 0, 0 }
391};
392
393/*
394 * Translate from bits/second to a speed_t.
395 */
396static int
397translate_speed(bps)
398    int bps;
399{
400    struct speed *speedp;
401
402    if (bps == 0)
403	return 0;
404    for (speedp = speeds; speedp->speed_int; speedp++)
405	if (bps == speedp->speed_int)
406	    return speedp->speed_val;
407    warn("speed %d not supported", bps);
408    return 0;
409}
410
411/*
412 * Translate from a speed_t to bits/second.
413 */
414static int
415baud_rate_of(speed)
416    int speed;
417{
418    struct speed *speedp;
419
420    if (speed == 0)
421	return 0;
422    for (speedp = speeds; speedp->speed_int; speedp++)
423	if (speed == speedp->speed_val)
424	    return speedp->speed_int;
425    return 0;
426}
427
428/*
429 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
430 * at the requested speed, etc.  If `local' is true, set CLOCAL
431 * regardless of whether the modem option was specified.
432 */
433void
434set_up_tty(fd, local)
435    int fd, local;
436{
437    int speed;
438    struct termios tios;
439
440    if (tcgetattr(fd, &tios) < 0)
441	fatal("tcgetattr: %m");
442
443    if (!restore_term) {
444	inittermios = tios;
445	ioctl(fd, TIOCGWINSZ, &wsinfo);
446    }
447
448    tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
449    if (crtscts > 0)
450	tios.c_cflag |= CRTSCTS;
451    else if (crtscts < 0)
452	tios.c_cflag &= ~CRTSCTS;
453
454    tios.c_cflag |= CS8 | CREAD | HUPCL;
455    if (local || !modem)
456	tios.c_cflag |= CLOCAL;
457    tios.c_iflag = IGNBRK | IGNPAR;
458    tios.c_oflag = 0;
459    tios.c_lflag = 0;
460    tios.c_cc[VMIN] = 1;
461    tios.c_cc[VTIME] = 0;
462
463    if (crtscts == -2) {
464	tios.c_iflag |= IXON | IXOFF;
465	tios.c_cc[VSTOP] = 0x13;	/* DC3 = XOFF = ^S */
466	tios.c_cc[VSTART] = 0x11;	/* DC1 = XON  = ^Q */
467    }
468
469    speed = translate_speed(inspeed);
470    if (speed) {
471	cfsetospeed(&tios, speed);
472	cfsetispeed(&tios, speed);
473    } else {
474	speed = cfgetospeed(&tios);
475	/*
476	 * We can't proceed if the serial port speed is 0,
477	 * since that implies that the serial port is disabled.
478	 */
479	if (speed == B0)
480	    fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
481    }
482
483    if (tcsetattr(fd, TCSAFLUSH, &tios) < 0)
484	fatal("tcsetattr: %m");
485
486    baud_rate = inspeed = baud_rate_of(speed);
487    restore_term = 1;
488}
489
490/*
491 * restore_tty - restore the terminal to the saved settings.
492 */
493void
494restore_tty(fd)
495    int fd;
496{
497    if (restore_term) {
498	if (!default_device) {
499	    /*
500	     * Turn off echoing, because otherwise we can get into
501	     * a loop with the tty and the modem echoing to each other.
502	     * We presume we are the sole user of this tty device, so
503	     * when we close it, it will revert to its defaults anyway.
504	     */
505	    inittermios.c_lflag &= ~(ECHO | ECHONL);
506	}
507	if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
508	    if (!hungup && errno != ENXIO)
509		warn("tcsetattr: %m");
510	ioctl(fd, TIOCSWINSZ, &wsinfo);
511	restore_term = 0;
512    }
513}
514
515/*
516 * setdtr - control the DTR line on the serial port.
517 * This is called from die(), so it shouldn't call die().
518 */
519void
520setdtr(fd, on)
521int fd, on;
522{
523    int modembits = TIOCM_DTR;
524
525    ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
526}
527
528/*
529 * open_loopback - open the device we use for getting packets
530 * in demand mode.  Under SunOS, we use our existing fd
531 * to the ppp driver.
532 */
533int
534open_ppp_loopback()
535{
536    return pppfd;
537}
538
539/*
540 * output - Output PPP packet.
541 */
542void
543output(unit, p, len)
544    int unit;
545    u_char *p;
546    int len;
547{
548    struct strbuf data;
549    int retries;
550    struct pollfd pfd;
551
552    if (debug)
553	dbglog("sent %P", p, len);
554
555    data.len = len;
556    data.buf = (caddr_t) p;
557    retries = 4;
558    while (putmsg(pppfd, NULL, &data, 0) < 0) {
559	if (--retries < 0 || (errno != EWOULDBLOCK && errno != EAGAIN)) {
560	    if (errno != ENXIO)
561		error("Couldn't send packet: %m");
562	    break;
563	}
564	pfd.fd = pppfd;
565	pfd.events = POLLOUT;
566	poll(&pfd, 1, 250);	/* wait for up to 0.25 seconds */
567    }
568}
569
570
571/*
572 * wait_input - wait until there is data available,
573 * for the length of time specified by *timo (indefinite
574 * if timo is NULL).
575 */
576void
577wait_input(timo)
578    struct timeval *timo;
579{
580    int t;
581
582    t = timo == NULL? -1: timo->tv_sec * 1000 + timo->tv_usec / 1000;
583    if (poll(pollfds, n_pollfds, t) < 0 && errno != EINTR) {
584	if (errno != EAGAIN)
585	    fatal("poll: %m");
586	/* we can get EAGAIN on a heavily loaded system,
587	 * just wait a short time and try again. */
588	usleep(50000);
589    }
590}
591
592/*
593 * add_fd - add an fd to the set that wait_input waits for.
594 */
595void add_fd(fd)
596    int fd;
597{
598    int n;
599
600    for (n = 0; n < n_pollfds; ++n)
601	if (pollfds[n].fd == fd)
602	    return;
603    if (n_pollfds < MAX_POLLFDS) {
604	pollfds[n_pollfds].fd = fd;
605	pollfds[n_pollfds].events = POLLIN | POLLPRI | POLLHUP;
606	++n_pollfds;
607    } else
608	error("Too many inputs!");
609}
610
611/*
612 * remove_fd - remove an fd from the set that wait_input waits for.
613 */
614void remove_fd(fd)
615    int fd;
616{
617    int n;
618
619    for (n = 0; n < n_pollfds; ++n) {
620	if (pollfds[n].fd == fd) {
621	    while (++n < n_pollfds)
622		pollfds[n-1] = pollfds[n];
623	    --n_pollfds;
624	    break;
625	}
626    }
627}
628
629
630/*
631 * read_packet - get a PPP packet from the serial device.
632 */
633int
634read_packet(buf)
635    u_char *buf;
636{
637    struct strbuf ctrl, data;
638    int flags, len;
639    unsigned char ctrlbuf[64];
640
641    for (;;) {
642	data.maxlen = PPP_MRU + PPP_HDRLEN;
643	data.buf = (caddr_t) buf;
644	ctrl.maxlen = sizeof(ctrlbuf);
645	ctrl.buf = (caddr_t) ctrlbuf;
646	flags = 0;
647	len = getmsg(pppfd, &ctrl, &data, &flags);
648	if (len < 0) {
649	    if (errno == EAGAIN || errno == EINTR)
650		return -1;
651	    fatal("Error reading packet: %m");
652	}
653
654	if (ctrl.len <= 0)
655	    return data.len;
656
657	/*
658	 * Got a M_PROTO or M_PCPROTO message.  Huh?
659	 */
660	if (debug)
661	    dbglog("got ctrl msg len=%d", ctrl.len);
662
663    }
664}
665
666/*
667 * get_loop_output - get outgoing packets from the ppp device,
668 * and detect when we want to bring the real link up.
669 * Return value is 1 if we need to bring up the link, 0 otherwise.
670 */
671int
672get_loop_output()
673{
674    int len;
675    int rv = 0;
676
677    while ((len = read_packet(inpacket_buf)) > 0) {
678	if (loop_frame(inpacket_buf, len))
679	    rv = 1;
680    }
681    return rv;
682}
683
684/*
685 * ppp_send_config - configure the transmit characteristics of
686 * the ppp interface.
687 */
688void
689ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
690    int unit, mtu;
691    u_int32_t asyncmap;
692    int pcomp, accomp;
693{
694    int cf[2];
695    struct ifreq ifr;
696
697    link_mtu = mtu;
698    if (strioctl(pppfd, PPPIO_MTU, &mtu, sizeof(mtu), 0) < 0) {
699	if (hungup && errno == ENXIO)
700	    return;
701	error("Couldn't set MTU: %m");
702    }
703    if (strioctl(pppfd, PPPIO_XACCM, &asyncmap, sizeof(asyncmap), 0) < 0) {
704	error("Couldn't set transmit ACCM: %m");
705    }
706    cf[0] = (pcomp? COMP_PROT: 0) + (accomp? COMP_AC: 0);
707    cf[1] = COMP_PROT | COMP_AC;
708    if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
709	error("Couldn't set prot/AC compression: %m");
710    }
711
712    /* set mtu for ip as well */
713    memset(&ifr, 0, sizeof(ifr));
714    strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
715    ifr.ifr_metric = link_mtu;
716    if (ioctl(sockfd, SIOCSIFMTU, &ifr) < 0) {
717	error("Couldn't set IP MTU: %m");
718    }
719}
720
721/*
722 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
723 */
724void
725ppp_set_xaccm(unit, accm)
726    int unit;
727    ext_accm accm;
728{
729    if (strioctl(pppfd, PPPIO_XACCM, accm, sizeof(ext_accm), 0) < 0) {
730	if (!hungup || errno != ENXIO)
731	    warn("Couldn't set extended ACCM: %m");
732    }
733}
734
735/*
736 * ppp_recv_config - configure the receive-side characteristics of
737 * the ppp interface.
738 */
739void
740ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
741    int unit, mru;
742    u_int32_t asyncmap;
743    int pcomp, accomp;
744{
745    int cf[2];
746
747    link_mru = mru;
748    if (strioctl(pppfd, PPPIO_MRU, &mru, sizeof(mru), 0) < 0) {
749	if (hungup && errno == ENXIO)
750	    return;
751	error("Couldn't set MRU: %m");
752    }
753    if (strioctl(pppfd, PPPIO_RACCM, &asyncmap, sizeof(asyncmap), 0) < 0) {
754	error("Couldn't set receive ACCM: %m");
755    }
756    cf[0] = (pcomp? DECOMP_PROT: 0) + (accomp? DECOMP_AC: 0);
757    cf[1] = DECOMP_PROT | DECOMP_AC;
758    if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
759	error("Couldn't set prot/AC decompression: %m");
760    }
761}
762
763/*
764 * ccp_test - ask kernel whether a given compression method
765 * is acceptable for use.
766 */
767int
768ccp_test(unit, opt_ptr, opt_len, for_transmit)
769    int unit, opt_len, for_transmit;
770    u_char *opt_ptr;
771{
772    if (strioctl(pppfd, (for_transmit? PPPIO_XCOMP: PPPIO_RCOMP),
773		 opt_ptr, opt_len, 0) >= 0)
774	return 1;
775    return (errno == ENOSR)? 0: -1;
776}
777
778/*
779 * ccp_flags_set - inform kernel about the current state of CCP.
780 */
781void
782ccp_flags_set(unit, isopen, isup)
783    int unit, isopen, isup;
784{
785    int cf[2];
786
787    cf[0] = (isopen? CCP_ISOPEN: 0) + (isup? CCP_ISUP: 0);
788    cf[1] = CCP_ISOPEN | CCP_ISUP | CCP_ERROR | CCP_FATALERROR;
789    if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
790	if (!hungup || errno != ENXIO)
791	    error("Couldn't set kernel CCP state: %m");
792    }
793}
794
795/*
796 * get_idle_time - return how long the link has been idle.
797 */
798int
799get_idle_time(u, ip)
800    int u;
801    struct ppp_idle *ip;
802{
803    return strioctl(pppfd, PPPIO_GIDLE, ip, 0, sizeof(struct ppp_idle)) >= 0;
804}
805
806/*
807 * get_ppp_stats - return statistics for the link.
808 */
809int
810get_ppp_stats(u, stats)
811    int u;
812    struct pppd_stats *stats;
813{
814    struct ppp_stats s;
815
816    if (strioctl(pppfd, PPPIO_GETSTAT, &s, 0, sizeof(s)) < 0) {
817	error("Couldn't get link statistics: %m");
818	return 0;
819    }
820    stats->bytes_in = s.p.ppp_ibytes;
821    stats->bytes_out = s.p.ppp_obytes;
822    return 1;
823}
824
825
826/*
827 * ccp_fatal_error - returns 1 if decompression was disabled as a
828 * result of an error detected after decompression of a packet,
829 * 0 otherwise.  This is necessary because of patent nonsense.
830 */
831int
832ccp_fatal_error(unit)
833    int unit;
834{
835    int cf[2];
836
837    cf[0] = cf[1] = 0;
838    if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
839	if (errno != ENXIO && errno != EINVAL)
840	    error("Couldn't get compression flags: %m");
841	return 0;
842    }
843    return cf[0] & CCP_FATALERROR;
844}
845
846/*
847 * sifvjcomp - config tcp header compression
848 */
849int
850sifvjcomp(u, vjcomp, xcidcomp, xmaxcid)
851    int u, vjcomp, xcidcomp, xmaxcid;
852{
853    int cf[2];
854    char maxcid[2];
855
856    if (vjcomp) {
857	maxcid[0] = xcidcomp;
858	maxcid[1] = 15;
859	if (strioctl(pppfd, PPPIO_VJINIT, maxcid, sizeof(maxcid), 0) < 0) {
860	    error("Couldn't initialize VJ compression: %m");
861	}
862    }
863
864    cf[0] = (vjcomp? COMP_VJC + DECOMP_VJC: 0)
865	+ (xcidcomp? COMP_VJCCID + DECOMP_VJCCID: 0);
866    cf[1] = COMP_VJC + DECOMP_VJC + COMP_VJCCID + DECOMP_VJCCID;
867    if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
868	if (vjcomp)
869	    error("Couldn't enable VJ compression: %m");
870    }
871
872    return 1;
873}
874
875/*
876 * sifup - Config the interface up and enable IP packets to pass.
877 */
878int
879sifup(u)
880    int u;
881{
882    struct ifreq ifr;
883
884    strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
885    if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
886	error("Couldn't mark interface up (get): %m");
887	return 0;
888    }
889    ifr.ifr_flags |= IFF_UP;
890    if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
891	error("Couldn't mark interface up (set): %m");
892	return 0;
893    }
894    if_is_up = 1;
895    return 1;
896}
897
898/*
899 * sifdown - Config the interface down and disable IP.
900 */
901int
902sifdown(u)
903    int u;
904{
905    struct ifreq ifr;
906
907    strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
908    if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
909	error("Couldn't mark interface down (get): %m");
910	return 0;
911    }
912    if ((ifr.ifr_flags & IFF_UP) != 0) {
913	ifr.ifr_flags &= ~IFF_UP;
914	if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
915	    error("Couldn't mark interface down (set): %m");
916	    return 0;
917	}
918    }
919    if_is_up = 0;
920    return 1;
921}
922
923/*
924 * sifnpmode - Set the mode for handling packets for a given NP.
925 */
926int
927sifnpmode(u, proto, mode)
928    int u;
929    int proto;
930    enum NPmode mode;
931{
932    int npi[2];
933
934    npi[0] = proto;
935    npi[1] = (int) mode;
936    if (strioctl(pppfd, PPPIO_NPMODE, npi, 2 * sizeof(int), 0) < 0) {
937	error("ioctl(set NP %d mode to %d): %m", proto, mode);
938	return 0;
939    }
940    return 1;
941}
942
943#define INET_ADDR(x)	(((struct sockaddr_in *) &(x))->sin_addr.s_addr)
944
945/*
946 * sifaddr - Config the interface IP addresses and netmask.
947 */
948int
949sifaddr(u, o, h, m)
950    int u;
951    u_int32_t o, h, m;
952{
953    struct ifreq ifr;
954
955    memset(&ifr, 0, sizeof(ifr));
956    strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
957    ifr.ifr_addr.sa_family = AF_INET;
958    INET_ADDR(ifr.ifr_addr) = m;
959    if (ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
960	error("Couldn't set IP netmask: %m");
961    }
962    ifr.ifr_addr.sa_family = AF_INET;
963    INET_ADDR(ifr.ifr_addr) = o;
964    if (ioctl(sockfd, SIOCSIFADDR, &ifr) < 0) {
965	error("Couldn't set local IP address: %m");
966    }
967    ifr.ifr_dstaddr.sa_family = AF_INET;
968    INET_ADDR(ifr.ifr_dstaddr) = h;
969    if (ioctl(sockfd, SIOCSIFDSTADDR, &ifr) < 0) {
970	error("Couldn't set remote IP address: %m");
971    }
972    ifaddrs[0] = o;
973    ifaddrs[1] = h;
974
975    return 1;
976}
977
978/*
979 * cifaddr - Clear the interface IP addresses, and delete routes
980 * through the interface if possible.
981 */
982int
983cifaddr(u, o, h)
984    int u;
985    u_int32_t o, h;
986{
987    struct rtentry rt;
988
989    bzero(&rt, sizeof(rt));
990    rt.rt_dst.sa_family = AF_INET;
991    INET_ADDR(rt.rt_dst) = h;
992    rt.rt_gateway.sa_family = AF_INET;
993    INET_ADDR(rt.rt_gateway) = o;
994    rt.rt_flags = RTF_HOST;
995    if (ioctl(sockfd, SIOCDELRT, &rt) < 0)
996	error("Couldn't delete route through interface: %m");
997    ifaddrs[0] = 0;
998    return 1;
999}
1000
1001/*
1002 * sifdefaultroute - assign a default route through the address given.
1003 */
1004int
1005sifdefaultroute(u, l, g)
1006    int u;
1007    u_int32_t l, g;
1008{
1009    struct rtentry rt;
1010
1011    bzero(&rt, sizeof(rt));
1012    rt.rt_dst.sa_family = AF_INET;
1013    INET_ADDR(rt.rt_dst) = 0;
1014    rt.rt_gateway.sa_family = AF_INET;
1015    INET_ADDR(rt.rt_gateway) = g;
1016    rt.rt_flags = RTF_GATEWAY;
1017
1018    if (ioctl(sockfd, SIOCADDRT, &rt) < 0) {
1019	error("Can't add default route: %m");
1020	return 0;
1021    }
1022
1023    default_route_gateway = g;
1024    return 1;
1025}
1026
1027/*
1028 * cifdefaultroute - delete a default route through the address given.
1029 */
1030int
1031cifdefaultroute(u, l, g)
1032    int u;
1033    u_int32_t l, g;
1034{
1035    struct rtentry rt;
1036
1037    bzero(&rt, sizeof(rt));
1038    rt.rt_dst.sa_family = AF_INET;
1039    INET_ADDR(rt.rt_dst) = 0;
1040    rt.rt_gateway.sa_family = AF_INET;
1041    INET_ADDR(rt.rt_gateway) = g;
1042    rt.rt_flags = RTF_GATEWAY;
1043
1044    if (ioctl(sockfd, SIOCDELRT, &rt) < 0) {
1045	error("Can't delete default route: %m");
1046	return 0;
1047    }
1048
1049    default_route_gateway = 0;
1050    return 1;
1051}
1052
1053/*
1054 * sifproxyarp - Make a proxy ARP entry for the peer.
1055 */
1056int
1057sifproxyarp(unit, hisaddr)
1058    int unit;
1059    u_int32_t hisaddr;
1060{
1061    struct arpreq arpreq;
1062
1063    bzero(&arpreq, sizeof(arpreq));
1064    if (!get_ether_addr(hisaddr, &arpreq.arp_ha))
1065	return 0;
1066
1067    arpreq.arp_pa.sa_family = AF_INET;
1068    INET_ADDR(arpreq.arp_pa) = hisaddr;
1069    arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1070    if (ioctl(sockfd, SIOCSARP, (caddr_t) &arpreq) < 0) {
1071	error("Couldn't set proxy ARP entry: %m");
1072	return 0;
1073    }
1074
1075    proxy_arp_addr = hisaddr;
1076    return 1;
1077}
1078
1079/*
1080 * cifproxyarp - Delete the proxy ARP entry for the peer.
1081 */
1082int
1083cifproxyarp(unit, hisaddr)
1084    int unit;
1085    u_int32_t hisaddr;
1086{
1087    struct arpreq arpreq;
1088
1089    bzero(&arpreq, sizeof(arpreq));
1090    arpreq.arp_pa.sa_family = AF_INET;
1091    INET_ADDR(arpreq.arp_pa) = hisaddr;
1092    if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1093	error("Couldn't delete proxy ARP entry: %m");
1094	return 0;
1095    }
1096
1097    proxy_arp_addr = 0;
1098    return 1;
1099}
1100
1101/*
1102 * get_ether_addr - get the hardware address of an interface on the
1103 * the same subnet as ipaddr.
1104 */
1105#define MAX_IFS		32
1106
1107static int
1108get_ether_addr(ipaddr, hwaddr)
1109    u_int32_t ipaddr;
1110    struct sockaddr *hwaddr;
1111{
1112    struct ifreq *ifr, *ifend;
1113    u_int32_t ina, mask;
1114    struct ifreq ifreq;
1115    struct ifconf ifc;
1116    struct ifreq ifs[MAX_IFS];
1117    int nit_fd;
1118
1119    ifc.ifc_len = sizeof(ifs);
1120    ifc.ifc_req = ifs;
1121    if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1122	error("ioctl(SIOCGIFCONF): %m");
1123	return 0;
1124    }
1125
1126    /*
1127     * Scan through looking for an interface with an Internet
1128     * address on the same subnet as `ipaddr'.
1129     */
1130    ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1131    for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1132	    ((char *)&ifr->ifr_addr + sizeof(struct sockaddr))) {
1133        if (ifr->ifr_addr.sa_family == AF_INET) {
1134
1135            /*
1136             * Check that the interface is up, and not point-to-point
1137             * or loopback.
1138             */
1139            strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1140            if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1141                continue;
1142            if ((ifreq.ifr_flags &
1143                 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1144                 != (IFF_UP|IFF_BROADCAST))
1145                continue;
1146
1147            /*
1148             * Get its netmask and check that it's on the right subnet.
1149             */
1150            if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1151                continue;
1152            ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1153            mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1154            if ((ipaddr & mask) != (ina & mask))
1155                continue;
1156
1157            break;
1158        }
1159    }
1160
1161    if (ifr >= ifend)
1162	return 0;
1163    info("found interface %s for proxy arp", ifr->ifr_name);
1164
1165    /*
1166     * Grab the physical address for this interface.
1167     */
1168    if ((nit_fd = open("/dev/nit", O_RDONLY)) < 0) {
1169	error("Couldn't open /dev/nit: %m");
1170	return 0;
1171    }
1172    strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1173    if (ioctl(nit_fd, NIOCBIND, &ifreq) < 0
1174	|| ioctl(nit_fd, SIOCGIFADDR, &ifreq) < 0) {
1175	error("Couldn't get hardware address for %s: %m",
1176	       ifreq.ifr_name);
1177	close(nit_fd);
1178	return 0;
1179    }
1180
1181    hwaddr->sa_family = AF_UNSPEC;
1182    memcpy(hwaddr->sa_data, ifreq.ifr_addr.sa_data, 6);
1183    close(nit_fd);
1184    return 1;
1185}
1186
1187/*
1188 * have_route_to - determine if the system has any route to
1189 * a given IP address.
1190 * For demand mode to work properly, we have to ignore routes
1191 * through our own interface.
1192 */
1193int have_route_to(addr)
1194    u_int32_t addr;
1195{
1196    return -1;
1197}
1198
1199#define	WTMPFILE	"/usr/adm/wtmp"
1200
1201void
1202logwtmp(line, name, host)
1203    const char *line, *name, *host;
1204{
1205    int fd;
1206    struct stat buf;
1207    struct utmp ut;
1208
1209    if ((fd = open(WTMPFILE, O_WRONLY|O_APPEND, 0)) < 0)
1210	return;
1211    if (!fstat(fd, &buf)) {
1212	strncpy(ut.ut_line, line, sizeof(ut.ut_line));
1213	strncpy(ut.ut_name, name, sizeof(ut.ut_name));
1214	strncpy(ut.ut_host, host, sizeof(ut.ut_host));
1215	(void)time(&ut.ut_time);
1216	if (write(fd, (char *)&ut, sizeof(struct utmp)) != sizeof(struct utmp))
1217	    (void)ftruncate(fd, buf.st_size);
1218    }
1219    close(fd);
1220}
1221
1222/*
1223 * Return user specified netmask, modified by any mask we might determine
1224 * for address `addr' (in network byte order).
1225 * Here we scan through the system's list of interfaces, looking for
1226 * any non-point-to-point interfaces which might appear to be on the same
1227 * network as `addr'.  If we find any, we OR in their netmask to the
1228 * user-specified netmask.
1229 */
1230u_int32_t
1231GetMask(addr)
1232    u_int32_t addr;
1233{
1234    u_int32_t mask, nmask, ina;
1235    struct ifreq *ifr, *ifend, ifreq;
1236    struct ifconf ifc;
1237
1238    addr = ntohl(addr);
1239    if (IN_CLASSA(addr))	/* determine network mask for address class */
1240	nmask = IN_CLASSA_NET;
1241    else if (IN_CLASSB(addr))
1242	nmask = IN_CLASSB_NET;
1243    else
1244	nmask = IN_CLASSC_NET;
1245    /* class D nets are disallowed by bad_ip_adrs */
1246    mask = netmask | htonl(nmask);
1247
1248    /*
1249     * Scan through the system's network interfaces.
1250     */
1251    ifc.ifc_len = MAX_IFS * sizeof(struct ifreq);
1252    ifc.ifc_req = alloca(ifc.ifc_len);
1253    if (ifc.ifc_req == 0)
1254	return mask;
1255    if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1256	warn("Couldn't get system interface list: %m");
1257	return mask;
1258    }
1259    ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1260    for (ifr = ifc.ifc_req; ifr < ifend; ++ifr) {
1261	/*
1262	 * Check the interface's internet address.
1263	 */
1264	if (ifr->ifr_addr.sa_family != AF_INET)
1265	    continue;
1266	ina = INET_ADDR(ifr->ifr_addr);
1267	if ((ntohl(ina) & nmask) != (addr & nmask))
1268	    continue;
1269	/*
1270	 * Check that the interface is up, and not point-to-point or loopback.
1271	 */
1272	strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1273	if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1274	    continue;
1275	if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1276	    != IFF_UP)
1277	    continue;
1278	/*
1279	 * Get its netmask and OR it into our mask.
1280	 */
1281	if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1282	    continue;
1283	mask |= INET_ADDR(ifreq.ifr_addr);
1284    }
1285
1286    return mask;
1287}
1288
1289static int
1290strioctl(fd, cmd, ptr, ilen, olen)
1291    int fd, cmd, ilen, olen;
1292    void *ptr;
1293{
1294    struct strioctl str;
1295
1296    str.ic_cmd = cmd;
1297    str.ic_timout = 0;
1298    str.ic_len = ilen;
1299    str.ic_dp = ptr;
1300    if (ioctl(fd, I_STR, &str) == -1)
1301	return -1;
1302    if (str.ic_len != olen)
1303	dbglog("strioctl: expected %d bytes, got %d for cmd %x\n",
1304	       olen, str.ic_len, cmd);
1305    return 0;
1306}
1307
1308/*
1309 * Use the hostid as part of the random number seed.
1310 */
1311int
1312get_host_seed()
1313{
1314    return gethostid();
1315}
1316
1317
1318/*
1319 * get_pty - get a pty master/slave pair and chown the slave side
1320 * to the uid given.  Assumes slave_name points to >= 12 bytes of space.
1321 */
1322int
1323get_pty(master_fdp, slave_fdp, slave_name, uid)
1324    int *master_fdp;
1325    int *slave_fdp;
1326    char *slave_name;
1327    int uid;
1328{
1329    int i, mfd, sfd;
1330    char pty_name[12];
1331    struct termios tios;
1332
1333    sfd = -1;
1334    for (i = 0; i < 64; ++i) {
1335	slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
1336		 'p' + i / 16, i % 16);
1337	mfd = open(pty_name, O_RDWR, 0);
1338	if (mfd >= 0) {
1339	    pty_name[5] = 't';
1340	    sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
1341	    if (sfd >= 0)
1342		break;
1343	    close(mfd);
1344	}
1345    }
1346    if (sfd < 0)
1347	return 0;
1348
1349    strlcpy(slave_name, pty_name, 12);
1350    *master_fdp = mfd;
1351    *slave_fdp = sfd;
1352    fchown(sfd, uid, -1);
1353    fchmod(sfd, S_IRUSR | S_IWUSR);
1354    if (tcgetattr(sfd, &tios) == 0) {
1355	tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
1356	tios.c_cflag |= CS8 | CREAD;
1357	tios.c_iflag  = IGNPAR | CLOCAL;
1358	tios.c_oflag  = 0;
1359	tios.c_lflag  = 0;
1360	if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0)
1361	    warn("couldn't set attributes on pty: %m");
1362    } else
1363	warn("couldn't get attributes on pty: %m");
1364
1365    return 1;
1366}
1367
1368/*
1369 * SunOS doesn't have strtoul :-(
1370 */
1371unsigned long
1372strtoul(str, ptr, base)
1373    char *str, **ptr;
1374    int base;
1375{
1376    return (unsigned long) strtol(str, ptr, base);
1377}
1378
1379/*
1380 * Or strerror :-(
1381 */
1382extern char *sys_errlist[];
1383extern int sys_nerr;
1384
1385char *
1386strerror(n)
1387    int n;
1388{
1389    static char unknown[32];
1390
1391    if (n > 0 && n < sys_nerr)
1392	return sys_errlist[n];
1393    slprintf(unknown, sizeof(unknown), "Error %d", n);
1394    return unknown;
1395}
1396