Fix the rechallenge behaviour. Previously, once it sent a rechallenge,

[mpls-ppp.git] / pppd / sys-aix4.c

/*
 * sys-aix4.c - System-dependent procedures for setting up
 * PPP interfaces on AIX systems which use the STREAMS ppp interface.
 *
 * Copyright (c) 1994-2002 Paul Mackerras. 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. The name(s) of the authors of this software must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission.
 *
 * 3. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Paul Mackerras
 *     <paulus@samba.org>".
 *
 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Derived from main.c and pppd.h, which are:
 *
 * Copyright (c) 1984-2000 Carnegie Mellon University. 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.
 *
 * 3. The name "Carnegie Mellon University" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For permission or any legal
 *    details, please contact
 *      Office of Technology Transfer
 *      Carnegie Mellon University
 *      5000 Forbes Avenue
 *      Pittsburgh, PA  15213-3890
 *      (412) 268-4387, fax: (412) 268-7395
 *      tech-transfer@andrew.cmu.edu
 *
 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Computing Services
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#define RCSID   "$Id: sys-aix4.c,v 1.24 2004/11/04 10:02:26 paulus Exp $"

/*
 * TODO:
 */

#include <stdio.h>
/*
#include <stdlib.h>
*/
#include <errno.h>
#include <termios.h>
#include <sys/termiox.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
#include <utmp.h>
#include <poll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/stream.h>
#include <sys/stropts.h>

#include <net/if.h>
#include <net/ppp_defs.h>
#include <net/route.h>
#include <net/if_arp.h>
#include <netinet/in.h>

#include "pppd.h"

static const char rcsid[] = RCSID;

#ifndef ifr_mtu
#define ifr_mtu         ifr_metric
#endif

#define MAXMODULES      10      /* max number of module names to save */
static struct   modlist {
    char        modname[FMNAMESZ+1];
} str_modules[MAXMODULES];
static int      str_module_count = 0;
static int      pushed_ppp;
static int      closed_stdio;

static int      restore_term;   /* 1 => we've munged the terminal */
static struct termios inittermios; /* Initial TTY termios */
static int      initfdflags = -1; /* Initial file descriptor flags for fd */

static int sockfd;              /* socket for doing interface ioctls */

static int      if_is_up;       /* Interface has been marked up */
static u_int32_t ifaddrs[2];    /* local and remote addresses */
static u_int32_t default_route_gateway; /* Gateway for default route added */
static u_int32_t proxy_arp_addr;        /* Addr for proxy arp entry added */

#define MAX_POLLFDS     32
static struct pollfd pollfds[MAX_POLLFDS];
static int n_pollfds;

/* Prototypes for procedures local to this file. */
static int translate_speed __P((int));
static int baud_rate_of __P((int));
static int get_ether_addr __P((u_int32_t, struct sockaddr *));


/*
 * sys_init - System-dependent initialization.
 */
void
sys_init()
{
    /* Get an internet socket for doing socket ioctl's on. */
    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
        fatal("Couldn't create IP socket: %m");

    n_pollfds = 0;
}

/*
 * sys_cleanup - restore any system state we modified before exiting:
 * mark the interface down, delete default route and/or proxy arp entry.
 * This should call die() because it's called from die().
 */
void
sys_cleanup()
{
    struct ifreq ifr;

    if (if_is_up) {
        strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
        if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0
            && ((ifr.ifr_flags & IFF_UP) != 0)) {
            ifr.ifr_flags &= ~IFF_UP;
            ioctl(sockfd, SIOCSIFFLAGS, &ifr);
        }
    }
    if (ifaddrs[0])
        cifaddr(0, ifaddrs[0], ifaddrs[1]);
    if (default_route_gateway)
        cifdefaultroute(0, 0, default_route_gateway);
    if (proxy_arp_addr)
        cifproxyarp(0, proxy_arp_addr);
}

/*
 * have_route_to - determine if the system has any route to
 * a given IP address.
 * For demand mode to work properly, we have to ignore routes
 * through our own interface.
 */
int have_route_to(u_int32_t addr)
{
    return -1;
}

#if 0
/*
 * daemon - Detach us from the terminal session.
 */
int
daemon(nochdir, noclose)
    int nochdir, noclose;
{
    int pid;

    if ((pid = fork()) < 0)
        return -1;
    if (pid != 0)
        exit(0);                /* parent dies */
    setsid();
    if (!nochdir)
        chdir("/");
    if (!noclose) {
        fclose(stdin);          /* don't need stdin, stdout, stderr */
        fclose(stdout);
        fclose(stderr);
    }
    return 0;
}
#endif

/*
 * ppp_available - check if this kernel supports PPP.
 */
int
ppp_available()
{
    int fd, ret;

    fd = open("/dev/tty", O_RDONLY, 0);
    if (fd < 0)
        return 1;               /* can't find out - assume we have ppp */
    ret = ioctl(fd, I_FIND, "pppasync") >= 0;
    close(fd);
    return ret;
}


/*
 * establish_ppp - Turn the serial port into a ppp interface.
 */
int
establish_ppp(fd)
    int fd;
{
    /* go through and save the name of all the modules, then pop em */
    for (;;) { 
        if (ioctl(fd, I_LOOK, str_modules[str_module_count].modname) < 0 ||
            ioctl(fd, I_POP, 0) < 0)
            break;
        SYSDEBUG(("popped stream module : %s",
                   str_modules[str_module_count].modname));
        str_module_count++;
    }

    /* now push the async/fcs module */
    if (ioctl(fd, I_PUSH, "pppasync") < 0)
        fatal("ioctl(I_PUSH, ppp_async): %m");
    /* push the compress module */
    if (ioctl(fd, I_PUSH, "pppcomp") < 0) {
        warn("ioctl(I_PUSH, ppp_comp): %m");
    }
    /* finally, push the ppp_if module that actually handles the */
    /* network interface */ 
    if (ioctl(fd, I_PUSH, "pppif") < 0)
        fatal("ioctl(I_PUSH, ppp_if): %m");
    pushed_ppp = 1;
    /* read mode, message non-discard mode
    if (ioctl(fd, I_SRDOPT, RMSGN) < 0)
        fatal("ioctl(I_SRDOPT, RMSGN): %m");
*/
    /*
     * Find out which interface we were given.
     * (ppp_if handles this ioctl)
     */
    if (ioctl(fd, SIOCGETU, &ifunit) < 0)
        fatal("ioctl(SIOCGETU): %m");

    /* Set debug flags in driver */
    if (ioctl(fd, SIOCSIFDEBUG, kdebugflag) < 0) {
        error("ioctl(SIOCSIFDEBUG): %m");
    }

    /* close stdin, stdout, stderr if they might refer to the device */
    if (default_device && !closed_stdio) {
        int i;

        for (i = 0; i <= 2; ++i)
            if (i != fd && i != sockfd)
                close(i);
        closed_stdio = 1;
    }

    /*
     * Set device for non-blocking reads.
     */
    if ((initfdflags = fcntl(fd, F_GETFL)) == -1
        || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
        warn("Couldn't set device to non-blocking mode: %m");
    }

    return fd;
}

/*
 * disestablish_ppp - Restore the serial port to normal operation.
 * It attempts to reconstruct the stream with the previously popped
 * modules.  This shouldn't call die() because it's called from die().
 */
void
disestablish_ppp(fd)
    int fd;
{
    int flags;
    char *s;

    /* Reset non-blocking mode on the file descriptor. */
    if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
        warn("Couldn't restore device fd flags: %m");
    initfdflags = -1;

    if (hungup) {
        /* we can't push or pop modules after the stream has hung up */
        str_module_count = 0;
        restore_term = 0;       /* nor can we fix up terminal settings */
        return;
    }

    if (pushed_ppp) {
        /*
         * Check whether the link seems not to be 8-bit clean.
         */
        if (ioctl(fd, SIOCGIFDEBUG, (caddr_t) &flags) == 0) {
            s = NULL;
            switch (~flags & PAI_FLAGS_HIBITS) {
            case PAI_FLAGS_B7_0:
                s = "bit 7 set to 1";
                break;
            case PAI_FLAGS_B7_1:
                s = "bit 7 set to 0";
                break;
            case PAI_FLAGS_PAR_EVEN:
                s = "odd parity";
                break;
            case PAI_FLAGS_PAR_ODD:
                s = "even parity";
                break;
            }
            if (s != NULL) {
                warn("Serial link is not 8-bit clean:");
                warn("All received characters had %s", s);
            }
        }
    }

    while (ioctl(fd, I_POP, 0) == 0)    /* pop any we pushed */
        ;
    pushed_ppp = 0;
  
    for (; str_module_count > 0; str_module_count--) {
        if (ioctl(fd, I_PUSH, str_modules[str_module_count-1].modname)) {
            if (errno != ENXIO)
                warn("str_restore: couldn't push module %s: %m",
                     str_modules[str_module_count-1].modname);
        } else {
            SYSDEBUG(("str_restore: pushed module %s",
                      str_modules[str_module_count-1].modname));
        }
    }
}


/*
 * List of valid speeds.
 */
struct speed {
    int speed_int, speed_val;
} speeds[] = {
#ifdef B50
    { 50, B50 },
#endif
#ifdef B75
    { 75, B75 },
#endif
#ifdef B110
    { 110, B110 },
#endif
#ifdef B134
    { 134, B134 },
#endif
#ifdef B150
    { 150, B150 },
#endif
#ifdef B200
    { 200, B200 },
#endif
#ifdef B300
    { 300, B300 },
#endif
#ifdef B600
    { 600, B600 },
#endif
#ifdef B1200
    { 1200, B1200 },
#endif
#ifdef B1800
    { 1800, B1800 },
#endif
#ifdef B2000
    { 2000, B2000 },
#endif
#ifdef B2400
    { 2400, B2400 },
#endif
#ifdef B3600
    { 3600, B3600 },
#endif
#ifdef B4800
    { 4800, B4800 },
#endif
#ifdef B7200
    { 7200, B7200 },
#endif
#ifdef B9600
    { 9600, B9600 },
#endif
#ifdef B19200
    { 19200, B19200 },
#endif
#ifdef B38400
    { 38400, B38400 },
#endif
#ifdef EXTA
    { 19200, EXTA },
#endif
#ifdef EXTB
    { 38400, EXTB },
#endif
#ifdef B57600
    { 57600, B57600 },
#endif
#ifdef B115200
    { 115200, B115200 },
#endif
    { 0, 0 }
};

/*
 * Translate from bits/second to a speed_t.
 */
static int
translate_speed(bps)
    int bps;
{
    struct speed *speedp;

    if (bps == 0)
        return 0;
    for (speedp = speeds; speedp->speed_int; speedp++)
        if (bps == speedp->speed_int)
            return speedp->speed_val;
    warn("speed %d not supported", bps);
    return 0;
}

/*
 * Translate from a speed_t to bits/second.
 */
static int
baud_rate_of(speed)
    int speed;
{
    struct speed *speedp;

    if (speed == 0)
        return 0;
    for (speedp = speeds; speedp->speed_int; speedp++)
        if (speed == speedp->speed_val)
            return speedp->speed_int;
    return 0;
}

/*
 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
 * at the requested speed, etc.  If `local' is true, set CLOCAL
 * regardless of whether the modem option was specified.
 */
void
set_up_tty(fd, local)
    int fd, local;
{
    int speed;
    struct termios tios;
    struct termiox tiox;

    if (tcgetattr(fd, &tios) < 0)
        fatal("tcgetattr: %m");


    if (!restore_term)
        inittermios = tios;

    tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
    if (crtscts > 0) {
        bzero(&tiox, sizeof(tiox));
        ioctl(fd, TCGETX, &tiox);
        tiox.x_hflag = RTSXOFF;
        ioctl(fd, TCSETX, &tiox);
        tios.c_cflag &= ~(IXON | IXOFF);
    } else if (crtscts < 0) {
        bzero(&tiox, sizeof(tiox));
        ioctl(fd, TCGETX, &tiox);
        tiox.x_hflag &= ~RTSXOFF;
        ioctl(fd, TCSETX, &tiox);
    }


    tios.c_cflag |= CS8 | CREAD | HUPCL;
    if (local || !modem)
        tios.c_cflag |= CLOCAL;
    tios.c_iflag = IGNBRK | IGNPAR;
    tios.c_oflag = 0;
    tios.c_lflag = 0;
    tios.c_cc[VMIN] = 1;
    tios.c_cc[VTIME] = 0;

    if (crtscts == -2) {
        tios.c_iflag |= IXON | IXOFF;
        tios.c_cc[VSTOP] = 0x13;        /* DC3 = XOFF = ^S */
        tios.c_cc[VSTART] = 0x11;       /* DC1 = XON  = ^Q */
    }

    speed = translate_speed(inspeed);
    if (speed) {
        cfsetospeed(&tios, speed);
        cfsetispeed(&tios, speed);
    } else {
        speed = cfgetospeed(&tios);
        /*
         * We can't proceed if the serial port speed is B0,
         * since that implies that the serial port is disabled.
         */
        if (speed == B0)
            fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
    }

    if (tcsetattr(fd, TCSAFLUSH, &tios) < 0)
        fatal("tcsetattr: %m");

    baud_rate = inspeed = baud_rate_of(speed);
    restore_term = 1;
}

/*
 * restore_tty - restore the terminal to the saved settings.
 */
void
restore_tty(fd)
    int fd;
{
    if (restore_term) {
        if (!default_device) {
            /*
             * Turn off echoing, because otherwise we can get into
             * a loop with the tty and the modem echoing to each other.
             * We presume we are the sole user of this tty device, so
             * when we close it, it will revert to its defaults anyway.
             */
            inittermios.c_lflag &= ~(ECHO | ECHONL);
        }
        if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
            if (errno != ENXIO)
                warn("tcsetattr: %m");
        restore_term = 0;
    }
}

/*
 * setdtr - control the DTR line on the serial port.
 * This is called from die(), so it shouldn't call die().
 */
void
setdtr(fd, on)
int fd, on;
{
    int modembits = TIOCM_DTR;

    ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
}


/*
 * output - Output PPP packet.
 */
void
output(unit, p, len)
    int unit;
    u_char *p;
    int len;
{
    struct strbuf str;
    int retries;
    struct pollfd pfd;

    if (debug)
        dbglog("sent %P", p, len);

    str.len = len;
    str.buf = (caddr_t) p;
    retries = 4;
    while (putmsg(ttyfd, NULL, &str, 0) < 0) {
        if (--retries < 0 || (errno != EWOULDBLOCK && errno != EAGAIN)) {
            if (errno != ENXIO)
                error("Couldn't send packet: %m");
            break;
        }
        pfd.fd = ttyfd;
        pfd.events = POLLOUT;
        poll(&pfd, 1, 250);     /* wait for up to 0.25 seconds */
    }
}

/*
 * wait_input - wait for input, for a length of time specified in *timo.
 */
void
wait_input(timo)
    struct timeval *timo;
{
    int t;

    t = timo == NULL? -1: timo->tv_sec * 1000 + timo->tv_usec / 1000;
    if (poll(pollfds, n_pollfds, t) < 0 && errno != EINTR)
        fatal("poll: %m");
}

/*
 * add_fd - add an fd to the set that wait_input waits for.
 */
void add_fd(fd)
    int fd;
{
    int n;

    for (n = 0; n < n_pollfds; ++n)
        if (pollfds[n].fd == fd)
            return;
    if (n_pollfds < MAX_POLLFDS) {
        pollfds[n_pollfds].fd = fd;
        pollfds[n_pollfds].events = POLLIN | POLLPRI | POLLHUP;
        ++n_pollfds;
    } else
        error("Too many inputs!");
}

/*
 * remove_fd - remove an fd from the set that wait_input waits for.
 */
void remove_fd(fd)
    int fd;
{
    int n;

    for (n = 0; n < n_pollfds; ++n) {
        if (pollfds[n].fd == fd) {
            while (++n < n_pollfds)
                pollfds[n-1] = pollfds[n];
            --n_pollfds;
            break;
        }
    }
}


/*
 * read_packet - get a PPP packet from the serial device.
 */
int
read_packet(buf)
    u_char *buf;
{
    struct strbuf str, ctl;
    int len, i;
    unsigned char ctlbuf[16];

    str.maxlen = PPP_MTU + PPP_HDRLEN;
    str.buf = (caddr_t) buf;
    ctl.maxlen = sizeof(ctlbuf);
    ctl.buf = (caddr_t) ctlbuf;
    i = 0;
    len = getmsg(ttyfd, &ctl, &str, &i);
    if (len < 0) {
        if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) {
            return -1;
        }
        fatal("getmsg %m");
    }
    if (len) 
        SYSDEBUG(("getmsg returned 0x%x", len));
    if (ctl.len > 0)
        notice("got ctrl msg len %d %x %x\n", ctl.len, ctlbuf[0], ctlbuf[1]);

    if (str.len < 0) {
        SYSDEBUG(("getmsg short return length %d", str.len));
        return -1;
    }

    return str.len;
}


/*
 * ppp_send_config - configure the transmit characteristics of
 * the ppp interface.
 */
void
ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
    int unit, mtu;
    u_int32_t asyncmap;
    int pcomp, accomp;
{
    int c;
    struct ifreq ifr;

    strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
    ifr.ifr_mtu = mtu;
    if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
        fatal("ioctl(SIOCSIFMTU): %m");

    if(ioctl(ttyfd, SIOCSIFASYNCMAP, asyncmap) < 0)
        fatal("ioctl(SIOCSIFASYNCMAP): %m");

    c = (pcomp? 1: 0);
    if(ioctl(ttyfd, SIOCSIFCOMPPROT, c) < 0)
        fatal("ioctl(SIOCSIFCOMPPROT): %m");

    c = (accomp? 1: 0);
    if(ioctl(ttyfd, SIOCSIFCOMPAC, c) < 0)
        fatal("ioctl(SIOCSIFCOMPAC): %m");
}


/*
 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
 */
void
ppp_set_xaccm(unit, accm)
    int unit;
    ext_accm accm;
{
    if (ioctl(ttyfd, SIOCSIFXASYNCMAP, accm) < 0 && errno != ENOTTY)
        warn("ioctl(set extended ACCM): %m");
}


/*
 * ppp_recv_config - configure the receive-side characteristics of
 * the ppp interface.
 */
void
ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
    int unit, mru;
    u_int32_t asyncmap;
    int pcomp, accomp;
{
    char c;

    if (ioctl(ttyfd, SIOCSIFMRU, mru) < 0) {
        error("ioctl(SIOCSIFMRU): %m");
    }

    if (ioctl(ttyfd, SIOCSIFRASYNCMAP, (caddr_t) asyncmap) < 0) {
        error("ioctl(SIOCSIFRASYNCMAP): %m");
    }

    c = 2 + (pcomp? 1: 0);
    if(ioctl(ttyfd, SIOCSIFCOMPPROT, c) < 0) {
        error("ioctl(SIOCSIFCOMPPROT): %m");
    }

    c = 2 + (accomp? 1: 0);
    if (ioctl(ttyfd, SIOCSIFCOMPAC, c) < 0) {
        error("ioctl(SIOCSIFCOMPAC): %m");
    }
}

/*
 * ccp_test - ask kernel whether a given compression method
 * is acceptable for use.
 */
int
ccp_test(unit, opt_ptr, opt_len, for_transmit)
    int unit, opt_len, for_transmit;
    u_char *opt_ptr;
{
    struct ppp_option_data data;

    if ((unsigned) opt_len > MAX_PPP_OPTION)
        opt_len = MAX_PPP_OPTION;
    data.length = opt_len;
    data.transmit = for_transmit;
    BCOPY(opt_ptr, data.opt_data, opt_len);
    if (ioctl(ttyfd, SIOCSCOMPRESS, &data) >= 0)
        return 1;
    return (errno == ENOSR)? 0: -1;
}

/*
 * ccp_flags_set - inform kernel about the current state of CCP.
 */
void
ccp_flags_set(unit, isopen, isup)
    int unit, isopen, isup;
{
    int x;

    x = (isopen? 1: 0) + (isup? 2: 0);
    if (ioctl(ttyfd, SIOCSIFCOMP, x) < 0 && errno != ENOTTY)
        error("ioctl (SIOCSIFCOMP): %m");
}

/*
 * ccp_fatal_error - returns 1 if decompression was disabled as a
 * result of an error detected after decompression of a packet,
 * 0 otherwise.  This is necessary because of patent nonsense.
 */
int
ccp_fatal_error(unit)
    int unit;
{
    int x;

    if (ioctl(ttyfd, SIOCGIFCOMP, &x) < 0) {
        error("ioctl(SIOCGIFCOMP): %m");
        return 0;
    }
    return x & CCP_FATALERROR;
}

/*
 * sifvjcomp - config tcp header compression
 */
int
sifvjcomp(u, vjcomp, cidcomp, maxcid)
    int u, vjcomp, cidcomp, maxcid;
{
    int x;

    x = (vjcomp? 1: 0) + (cidcomp? 0: 2) + (maxcid << 4);
    if (ioctl(ttyfd, SIOCSIFVJCOMP, x) < 0) {
        error("ioctl(SIOCSIFVJCOMP): %m");
        return 0;
    }
    return 1;
}

/*
 * sifup - Config the interface up and enable IP packets to pass.
 */
int
sifup(u)
    int u;
{
    struct ifreq ifr;

    strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
    if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
        error("ioctl (SIOCGIFFLAGS): %m");
        return 0;
    }
    ifr.ifr_flags |= IFF_UP;
    if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
        error("ioctl(SIOCSIFFLAGS): %m");
        return 0;
    }

    if_is_up = 1;
    return 1;
}

/*
 * sifnpmode - Set the mode for handling packets for a given NP.
 */
int
sifnpmode(u, proto, mode)
    int u;
    int proto;
    enum NPmode mode;
{
    struct npioctl npi;

    npi.protocol = proto;
    npi.mode = mode;
    if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
        error("ioctl(set NP %d mode to %d): %m", proto, mode);
        return 0;
    }
    return 1;
}

/*
 * sifdown - Config the interface down.
 */
int
sifdown(u)
    int u;
{
    struct ifreq ifr;
    int rv;
    struct npioctl npi;

    rv = 1;
    npi.protocol = PPP_IP;
    npi.mode = NPMODE_ERROR;
    ioctl(ttyfd, SIOCSETNPMODE, &npi);
    /* ignore errors, because ttyfd might have been closed by now. */

    strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
    if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
        error("ioctl (SIOCGIFFLAGS): %m");
        rv = 0;
    } else {
        ifr.ifr_flags &= ~IFF_UP;
        if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
            error("ioctl(SIOCSIFFLAGS): %m");
            rv = 0;
        } else
            if_is_up = 0;
    }
    return rv;
}

/*
 * SET_SA_FAMILY - initialize a struct sockaddr, setting the sa_family field.
 */
#define SET_SA_FAMILY(addr, family)             \
    BZERO((char *) &(addr), sizeof(addr));      \
    addr.sa_family = (family);

/*
 * sifaddr - Config the interface IP addresses and netmask.
 */
int
sifaddr(u, o, h, m)
    int u;
    u_int32_t o, h, m;
{
    int ret;
    struct ifreq ifr;

    ret = 1;
    strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
    SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
    if (m != 0) {
        info("Setting interface mask to %s\n", ip_ntoa(m));
        ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = m;
        if (ioctl(sockfd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
            error("ioctl(SIOCSIFNETMASK): %m");
            ret = 0;
        }
    }

    ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o;
    if (ioctl(sockfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
        error("ioctl(SIOCSIFADDR): %m");
        ret = 0;
    }

    SET_SA_FAMILY(ifr.ifr_dstaddr, AF_INET);
    ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = h;
    if (ioctl(sockfd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
        error("ioctl(SIOCSIFDSTADDR): %m");
        ret = 0;
    }

    /* XXX is this necessary? */
    ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o;
    if (ioctl(sockfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
        error("ioctl(SIOCSIFADDR): %m");
        ret = 0;
    }

    ifaddrs[0] = o;
    ifaddrs[1] = h;
    return ret;
}

/*
 * cifaddr - Clear the interface IP addresses, and delete routes
 * through the interface if possible.
 */
int
cifaddr(u, o, h)
    int u;
    u_int32_t o, h;
{
    struct ortentry rt;

    ifaddrs[0] = 0;
    BZERO(&rt, sizeof(rt));
    SET_SA_FAMILY(rt.rt_dst, AF_INET);
    ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = h;
    SET_SA_FAMILY(rt.rt_gateway, AF_INET);
    ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = o;
    rt.rt_flags = RTF_HOST;
    if (ioctl(sockfd, SIOCDELRT, (caddr_t) &rt) < 0) {
        error("ioctl(SIOCDELRT): %m");
        return 0;
    }
    return 1;
}

/*
 * sifdefaultroute - assign a default route through the address given.
 */
int
sifdefaultroute(u, l, g)
    int u;
    u_int32_t l, g;
{
    struct ortentry rt;

    BZERO(&rt, sizeof(rt));
    SET_SA_FAMILY(rt.rt_dst, AF_INET);
    SET_SA_FAMILY(rt.rt_gateway, AF_INET);
    ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
    rt.rt_flags = RTF_GATEWAY;
    if (ioctl(sockfd, SIOCADDRT, &rt) < 0) {
        error("default route ioctl(SIOCADDRT): %m");
        return 0;
    }
    default_route_gateway = g;
    return 1;
}

/*
 * cifdefaultroute - delete a default route through the address given.
 */
int
cifdefaultroute(u, l, g)
    int u;
    u_int32_t l, g;
{
    struct ortentry rt;

    BZERO(&rt, sizeof(rt));
    SET_SA_FAMILY(rt.rt_dst, AF_INET);
    SET_SA_FAMILY(rt.rt_gateway, AF_INET);
    ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
    rt.rt_flags = RTF_GATEWAY;
    if (ioctl(sockfd, SIOCDELRT, &rt) < 0) {
        error("default route ioctl(SIOCDELRT): %m");
        return 0;
    }
    default_route_gateway = 0;
    return 1;
}

/*
 * sifproxyarp - Make a proxy ARP entry for the peer.
 */
int
sifproxyarp(unit, hisaddr)
    int unit;
    u_int32_t hisaddr;
{
    struct arpreq arpreq;

    BZERO(&arpreq, sizeof(arpreq));

    /*
     * Get the hardware address of an interface on the same subnet
     * as our local address.
     */
    if (!get_ether_addr(hisaddr, &arpreq.arp_ha)) {
        warn("Cannot determine ethernet address for proxy ARP");
        return 0;
    }

    SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
    ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
    arpreq.arp_flags = ATF_PERM | ATF_PUBL;
    if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
        error("ioctl(SIOCSARP): %m");
        return 0;
    }

    proxy_arp_addr = hisaddr;
    return 1;
}

/*
 * cifproxyarp - Delete the proxy ARP entry for the peer.
 */
int
cifproxyarp(unit, hisaddr)
    int unit;
    u_int32_t hisaddr;
{
    struct arpreq arpreq;

    BZERO(&arpreq, sizeof(arpreq));
    SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
    ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
    if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
        error("ioctl(SIOCDARP): %m");
        return 0;
    }
    proxy_arp_addr = 0;
    return 1;
}

/*
 * get_ether_addr - get the hardware address of an interface on the
 * the same subnet as ipaddr.  Code borrowed from myetheraddr.c
 * in the cslip-2.6 distribution, which is subject to the following
 * copyright notice (which also applies to logwtmp below):
 *
 * Copyright (c) 1990, 1992 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#include <nlist.h>
#include <arpa/inet.h>
#include <netinet/in_var.h>
#include <net/if_dl.h>

/* Cast a struct sockaddr to a structaddr_in */
#define SATOSIN(sa) ((struct sockaddr_in *)(sa))

/* Determine if "bits" is set in "flag" */
#define ALLSET(flag, bits) (((flag) & (bits)) == (bits))

static struct nlist nl[] = {
#define N_IFNET 0
        { "ifnet" },
        { 0 }
};

int kvm_read(int fd, off_t offset, void *buf, int nbytes)
{
    if (lseek(fd, offset, SEEK_SET) != offset) {
        error("lseek in kmem: %m");
        return(0);
    }
    return(read(fd, buf, nbytes));
}

int
get_ether_addr(ipaddr, hwaddr)
    u_long ipaddr;
    struct sockaddr *hwaddr;
{
    int         kd;
    register struct ifnet *ifp;
    register struct arpcom *ac;
    struct arpcom arpcom;
    struct in_addr *inp;
    register struct ifaddr *ifa;
    register struct in_ifaddr *in;
    union {
        struct ifaddr ifa;
        struct in_ifaddr in;
    } ifaddr;
    struct ifaddr       *ifap;
    struct sockaddr     ifaddrsaddr;
    struct sockaddr_in  ifmasksaddr;
    struct sockaddr_in  *ifinetptr;
    struct sockaddr_dl  *iflinkptr;
    u_long addr, mask, ifip;
    int         found = 0;

/* Open kernel memory for reading */
    if ((kd = open("/dev/kmem", O_RDONLY)) < 0) {
        error("/dev/kmem: %m");
        return 0;
    }

/* Fetch namelist */
    if (nlist("/unix", nl) != 0) {
        error("nlist(): %m");
        return 0;
    }

    ac = &arpcom;
    ifp = &arpcom.ac_if;
    ifa = &ifaddr.ifa;
    in = &ifaddr.in;

    if (kvm_read(kd, nl[N_IFNET].n_value, (char *)&addr, sizeof(addr))
        != sizeof(addr)) {
        error("error reading ifnet addr");
        return 0;
    }
    for ( ; addr && !found; addr = (u_long)ifp->if_next) {
        if (kvm_read(kd, addr, (char *)ac, sizeof(*ac)) != sizeof(*ac)) {
            error("error reading ifnet");
            return 0;
        }

/* Only look at configured, broadcast interfaces */
        if (!ALLSET(ifp->if_flags, IFF_UP | IFF_BROADCAST))
            continue;
/* This probably can't happen... */
        if (ifp->if_addrlist == 0)
            continue;

/* Get interface ip address */
        for (ifap = ifp->if_addrlist; ifap; ifap=ifaddr.ifa.ifa_next) {
            if (kvm_read(kd, (u_long)ifap, (char *)&ifaddr,
                     sizeof(ifaddr)) != sizeof(ifaddr)) {
                error("error reading ifaddr");
                return 0;
            }
            if (kvm_read(kd, (u_long)ifaddr.ifa.ifa_addr, &ifaddrsaddr,
                sizeof(struct sockaddr_in)) != sizeof(struct sockaddr_in)) {
                error("error reading ifaddrsaddr");
                return(0);
            }
            if (kvm_read(kd, (u_long)ifaddr.ifa.ifa_netmask, &ifmasksaddr,
                sizeof(struct sockaddr_in)) != sizeof(struct sockaddr_in)) {
                error("error reading ifmasksaddr");
                return(0);
            }
    /* Check if this interface on the right subnet */
            switch (ifaddrsaddr.sa_family) {
            case AF_LINK :
                hwaddr->sa_family = AF_UNSPEC;
                iflinkptr = (struct sockaddr_dl *) &ifaddrsaddr;
                bcopy(LLADDR(iflinkptr),hwaddr->sa_data,iflinkptr->sdl_alen);
                break;
            case AF_INET:
                ifinetptr= (struct sockaddr_in *) &ifaddrsaddr;
                ifip = ifinetptr->sin_addr.s_addr;
                if (kvm_read(kd, (u_long)ifaddr.ifa.ifa_netmask, &ifmasksaddr,
                    sizeof(struct sockaddr_in)) != sizeof(struct sockaddr_in)) {
                    error("error reading ifmasksaddr");
                    return(0);
                }
                mask = ifmasksaddr.sin_addr.s_addr;
                if ((ipaddr & mask) == (ifip & mask))
                    ++found;
                break;
            default:
                break;
            }
   
        }
    }
    return(found);
}

/*
 * Return user specified netmask, modified by any mask we might determine
 * for address `addr' (in network byte order).
 * Here we scan through the system's list of interfaces, looking for
 * any non-point-to-point interfaces which might appear to be on the same
 * network as `addr'.  If we find any, we OR in their netmask to the
 * user-specified netmask.
 */
#define MAX_IFS         32

u_int32_t
GetMask(addr)
    u_int32_t addr;
{
    u_int32_t mask, nmask, ina;
    struct ifreq *ifr, *ifend, ifreq;
    struct ifconf ifc;
    struct ifreq ifs[MAX_IFS];

    addr = ntohl(addr);
    if (IN_CLASSA(addr))        /* determine network mask for address class */
        nmask = IN_CLASSA_NET;
    else if (IN_CLASSB(addr))
        nmask = IN_CLASSB_NET;
    else
        nmask = IN_CLASSC_NET;
    /* class D nets are disallowed by bad_ip_adrs */
    mask = netmask | htonl(nmask);

    /*
     * Scan through the system's network interfaces.
     */
    ifc.ifc_len = sizeof(ifs);
    ifc.ifc_req = ifs;
    if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
        warn("ioctl(SIOCGIFCONF): %m");
        return mask;
    }
    ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
    for (ifr = ifc.ifc_req; ifr < ifend; ++ifr) {
        /*
         * Check the interface's internet address.
         */
        if (ifr->ifr_addr.sa_family != AF_INET)
            continue;
        ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
        if ((ntohl(ina) & nmask) != (addr & nmask))
            continue;
        /*
         * Check that the interface is up, and not point-to-point or loopback.
         */
        strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
        if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
            continue;
        if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
            != IFF_UP)
            continue;
        /*
         * Get its netmask and OR it into our mask.
         */
        if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
            continue;
        mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
    }

    return mask;
}

#define WTMPFILE        "/var/adm/wtmp"

void
logwtmp(line, name, host)
    const char *line, *name, *host;
{
    int fd;
    struct stat buf;
    struct utmp ut;

    if ((fd = open(WTMPFILE, O_WRONLY|O_APPEND, 0)) < 0)
        return;
    if (!fstat(fd, &buf)) {
        strncpy(ut.ut_line, line, sizeof(ut.ut_line));
        strncpy(ut.ut_name, name, sizeof(ut.ut_name));
        strncpy(ut.ut_host, host, sizeof(ut.ut_host));
        (void)time(&ut.ut_time);
        if (write(fd, (char *)&ut, sizeof(struct utmp)) != sizeof(struct utmp))
            (void)ftruncate(fd, buf.st_size);
    }
    close(fd);
}

/*
 * Use the hostid as part of the random number seed.
 */
int
get_host_seed()
{
    return gethostid();
}

/*
 * Code for locking/unlocking the serial device.
 */

static  char *devlocked = (char *) 0;

int lock(char *device)
{
    char        *devname;
    int         rc;

    if (devname = strrchr(device,'/'))
        ++devname;
    else
        devname = device;

    if ((rc = ttylock(devname)) == 0) {
        devlocked = strdup(devname);
    } else
        devlocked = (char *) 0;

    return(rc);
}

int unlock()
{
    int rc = 0;

    if (devlocked) {
        rc = ttyunlock(devlocked);
        free(devlocked);
        devlocked = (char *) 0;
    }
    return(rc);
}