sys-sunos4.c

经典的ppp程序

{
    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 (!hungup && errno != ENXIO)
		warn("tcsetattr: %m");
	ioctl(fd, TIOCSWINSZ, &wsinfo);
	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);
}

/*
 * open_loopback - open the device we use for getting packets
 * in demand mode.  Under SunOS, we use our existing fd
 * to the ppp driver.
 */
int
open_ppp_loopback()
{
    return pppfd;
}

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

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

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


/*
 * wait_input - wait until there is data available,
 * for the length of time specified by *timo (indefinite
 * if timo is NULL).
 */
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) {
	if (errno != EAGAIN)
	    fatal("poll: %m");
	/* we can get EAGAIN on a heavily loaded system,
	 * just wait a short time and try again. */
	usleep(50000);
    }
}

/*
 * 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;
	}
    }
}

#if 0
/*
 * wait_loop_output - wait until there is data available on the
 * loopback, for the length of time specified by *timo (indefinite
 * if timo is NULL).
 */
void
wait_loop_output(timo)
    struct timeval *timo;
{
    wait_input(timo);
}

/*
 * wait_time - wait for a given length of time or until a
 * signal is received.
 */
void
wait_time(timo)
    struct timeval *timo;
{
    int n;

    n = select(0, NULL, NULL, NULL, timo);
    if (n < 0 && errno != EINTR)
	fatal("select: %m");
}
#endif

/*
 * read_packet - get a PPP packet from the serial device.
 */
int
read_packet(buf)
    u_char *buf;
{
    struct strbuf ctrl, data;
    int flags, len;
    unsigned char ctrlbuf[64];

    for (;;) {
	data.maxlen = PPP_MRU + PPP_HDRLEN;
	data.buf = (caddr_t) buf;
	ctrl.maxlen = sizeof(ctrlbuf);
	ctrl.buf = (caddr_t) ctrlbuf;
	flags = 0;
	len = getmsg(pppfd, &ctrl, &data, &flags);
	if (len < 0) {
	    if (errno == EAGAIN || errno == EINTR)
		return -1;
	    fatal("Error reading packet: %m");
	}

	if (ctrl.len <= 0)
	    return data.len;

	/*
	 * Got a M_PROTO or M_PCPROTO message.  Huh?
	 */
	if (debug)
	    dbglog("got ctrl msg len=%d", ctrl.len);

    }
}

/*
 * get_loop_output - get outgoing packets from the ppp device,
 * and detect when we want to bring the real link up.
 * Return value is 1 if we need to bring up the link, 0 otherwise.
 */
int
get_loop_output()
{
    int len;
    int rv = 0;

    while ((len = read_packet(inpacket_buf)) > 0) {
	if (loop_frame(inpacket_buf, len))
	    rv = 1;
    }
    return rv;
}

/*
 * 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 cf[2];
    struct ifreq ifr;

    link_mtu = mtu;
    if (strioctl(pppfd, PPPIO_MTU, &mtu, sizeof(mtu), 0) < 0) {
	if (hungup && errno == ENXIO)
	    return;
	error("Couldn't set MTU: %m");
    }
    if (strioctl(pppfd, PPPIO_XACCM, &asyncmap, sizeof(asyncmap), 0) < 0) {
	error("Couldn't set transmit ACCM: %m");
    }
    cf[0] = (pcomp? COMP_PROT: 0) + (accomp? COMP_AC: 0);
    cf[1] = COMP_PROT | COMP_AC;
    if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
	error("Couldn't set prot/AC compression: %m");
    }

    /* set mtu for ip as well */
    memset(&ifr, 0, sizeof(ifr));
    strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
    ifr.ifr_metric = link_mtu;
    if (ioctl(sockfd, SIOCSIFMTU, &ifr) < 0) {
	error("Couldn't set IP MTU: %m");
    }
}

/*
 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
 */
void
ppp_set_xaccm(unit, accm)
    int unit;
    ext_accm accm;
{
    if (strioctl(pppfd, PPPIO_XACCM, accm, sizeof(ext_accm), 0) < 0) {
	if (!hungup || errno != ENXIO)
	    warn("Couldn't 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;
{
    int cf[2];

    link_mru = mru;
    if (strioctl(pppfd, PPPIO_MRU, &mru, sizeof(mru), 0) < 0) {
	if (hungup && errno == ENXIO)
	    return;
	error("Couldn't set MRU: %m");
    }
    if (strioctl(pppfd, PPPIO_RACCM, &asyncmap, sizeof(asyncmap), 0) < 0) {
	error("Couldn't set receive ACCM: %m");
    }
    cf[0] = (pcomp? DECOMP_PROT: 0) + (accomp? DECOMP_AC: 0);
    cf[1] = DECOMP_PROT | DECOMP_AC;
    if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
	error("Couldn't set prot/AC decompression: %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;
{
    if (strioctl(pppfd, (for_transmit? PPPIO_XCOMP: PPPIO_RCOMP),
		 opt_ptr, opt_len, 0) >= 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 cf[2];

    cf[0] = (isopen? CCP_ISOPEN: 0) + (isup? CCP_ISUP: 0);
    cf[1] = CCP_ISOPEN | CCP_ISUP | CCP_ERROR | CCP_FATALERROR;
    if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
	if (!hungup || errno != ENXIO)
	    error("Couldn't set kernel CCP state: %m");
    }
}

/*
 * get_idle_time - return how long the link has been idle.
 */
int
get_idle_time(u, ip)
    int u;
    struct ppp_idle *ip;
{
    return strioctl(pppfd, PPPIO_GIDLE, ip, 0, sizeof(struct ppp_idle)) >= 0;
}

/*
 * get_ppp_stats - return statistics for the link.
 */
int
get_ppp_stats(u, stats)
    int u;
    struct pppd_stats *stats;
{
    struct ppp_stats s;

    if (strioctl(pppfd, PPPIO_GETSTAT, &s, 0, sizeof(s)) < 0) {
	error("Couldn't get link statistics: %m");
	return 0;
    }
    stats->bytes_in = s.p.ppp_ibytes;
    stats->bytes_out = s.p.ppp_obytes;
    return 1;
}


/*
 * 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 cf[2];

    cf[0] = cf[1] = 0;
    if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
	if (errno != ENXIO && errno != EINVAL)
	    error("Couldn't get compression flags: %m");
	return 0;
    }
    return cf[0] & CCP_FATALERROR;
}

/*
 * sifvjcomp - config tcp header compression
 */
int
sifvjcomp(u, vjcomp, xcidcomp, xmaxcid)
    int u, vjcomp, xcidcomp, xmaxcid;
{
    int cf[2];
    char maxcid[2];

    if (vjcomp) {
	maxcid[0] = xcidcomp;
	maxcid[1] = 15;		/* XXX should be rmaxcid */
	if (strioctl(pppfd, PPPIO_VJINIT, maxcid, sizeof(maxcid), 0) < 0) {
	    error("Couldn't initialize VJ compression: %m");
	}
    }

    cf[0] = (vjcomp? COMP_VJC + DECOMP_VJC: 0)	/* XXX this is wrong */
	+ (xcidcomp? COMP_VJCCID + DECOMP_VJCCID: 0);
    cf[1] = COMP_VJC + DECOMP_VJC + COMP_VJCCID + DECOMP_VJCCID;
    if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
	if (vjcomp)
	    error("Couldn't enable VJ compression: %m");
    }

    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, &ifr) < 0) {
	error("Couldn't mark interface up (get): %m");
	return 0;
    }
    ifr.ifr_flags |= IFF_UP;
    if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
	error("Couldn't mark interface up (set): %m");
	return 0;
    }
    if_is_up = 1;
    return 1;
}

/*
 * sifdown - Config the interface down and disable IP.
 */
int
sifdown(u)
    int u;
{
    struct ifreq ifr;

    strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
    if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
	error("Couldn't mark interface down (get): %m");
	return 0;
    }
    if ((ifr.ifr_flags & IFF_UP) != 0) {
	ifr.ifr_flags &= ~IFF_UP;
	if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
	    error("Couldn't mark interface down (set): %m");
	    return 0;
	}
    }
    if_is_up = 0;
    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;
{
    int npi[2];

    npi[0] = proto;
    npi[1] = (int) mode;
    if (strioctl(pppfd, PPPIO_NPMODE, npi, 2 * sizeof(int), 0) < 0) {
	error("ioctl(set NP %d mode to %d): %m", proto, mode);
	return 0;
    }
    return 1;
}

#define INET_ADDR(x)	(((struct sockaddr_in *) &(x))->sin_addr.s_addr)

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

    memset(&ifr, 0, sizeof(ifr));
    strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
    ifr.ifr_addr.sa_family = AF_INET;
    INET_ADDR(ifr.ifr_addr) = m;
    if (ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
	error("Couldn't set IP netmask: %m");
    }
    ifr.ifr_addr.sa_family = AF_INET;
    INET_ADDR(ifr.ifr_addr) = o;
    if (ioctl(sockfd, SIOCSIFADDR, &ifr) < 0) {
	error("Couldn't set local IP address: %m");
    }
    ifr.ifr_dstaddr.sa_family = AF_INET;
    INET_ADDR(ifr.ifr_dstaddr) = h;
    if (ioctl(sockfd, SIOCSIFDSTADDR, &ifr) < 0) {
	error("Couldn't set remote IP address: %m");
    }
#if 0	/* now done in ppp_send_config */
    ifr.ifr_metric = link_mtu;
    if (ioctl(sockfd, SIOCSIFMTU, &ifr) < 0) {
	error("Couldn't set IP MTU: %m");
    }
#endif
    ifaddrs[0] = o;
    ifaddrs[1] = h;

    return 1;
}

/*
 * cifaddr - Clear the interface IP addresses, and delete routes
 * through the interface if possible.
 */