Additions to support NeXTStep systems.

1 files changed, 1351 insertions, 0 deletions

diff --git a/pppd/sys-NeXT.c b/pppd/sys-NeXT.c
new file mode 100644
index 0000000..a23f611
--- /dev/null
+++ b/pppd/sys-NeXT.c
@@ -0,0 +1,1351 @@
+/*
+ * sys-next.c - System-dependent procedures for setting up
+ * PPP interfaces on NeXT 3.2/3.3  systems
+ *
+ * Copyright (c) 1989 Carnegie Mellon University.
+ * Copyright (c) 1994 Philippe-Andre Prindeville.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by Carnegie Mellon University.  The name of the
+ * University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef lint
+static char rcsid[] = "$Id: sys-NeXT.c,v 1.1 1995/08/10 06:48:34 paulus Exp $";
+#endif
+
+#include <stdio.h>
+#include <syslog.h>
+#include <termios.h>
+#include <utmp.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <strings.h>
+#include <sys/types.h>
+#include <sys/file.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/errno.h>
+#include <sys/stat.h>
+#include <sys/fcntl.h>
+
+#include <net/if.h>
+#include <net/ppp_defs.h>
+#include <net/if_ppp.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/in_var.h>
+#include <netinet/ip.h>
+#include <netinet/if_ether.h>
+#include <net/route.h>
+#include <netinet/in.h>
+
+#include <netinfo/ni.h>
+
+#include "pppd.h"
+
+static int initdisc = -1;	/* Initial TTY discipline */
+
+extern int errno;
+
+static int	restore_term;	/* 1 => we've munged the terminal */
+static struct termios inittermios; /* Initial TTY termios */
+
+static char *lock_file;
+
+int sockfd;			/* socket for doing interface ioctls */
+
+#if defined(i386) && defined(HAS_BROKEN_IOCTL)
+#define	ioctl	myioctl
+#endif
+
+/*
+ * sys_init - System-dependent initialization.
+ */
+void
+sys_init()
+{
+    openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
+    setlogmask(LOG_UPTO(LOG_INFO));
+    if (debug)
+	setlogmask(LOG_UPTO(LOG_DEBUG));
+
+    /* Get an internet socket for doing socket ioctl's on. */
+    if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+	syslog(LOG_ERR, "Couldn't create IP socket: %m");
+	die(1);
+    }
+}
+
+/*
+ * note_debug_level - note a change in the debug level.
+ */
+void
+note_debug_level()
+{
+    if (debug) {
+	syslog(LOG_INFO, "Debug turned ON, Level %d", debug);
+	setlogmask(LOG_UPTO(LOG_DEBUG));
+    } else {
+	setlogmask(LOG_UPTO(LOG_WARNING));
+    }
+}
+
+/*
+ * ppp_available - check whether the system has any ppp interfaces
+ * (in fact we check whether we can do an ioctl on ppp0).
+ */
+int
+ppp_available()
+{
+    int s, ok;
+    struct ifreq ifr;
+
+    if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
+	return 1;		/* can't tell - maybe we're not root */
+
+    strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
+    ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
+    close(s);
+
+    return ok;
+}
+
+/*
+ * establish_ppp - Turn the serial port into a ppp interface.
+ */
+void
+establish_ppp()
+{
+    int pppdisc = PPPDISC;
+    int x;
+
+    if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
+	syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
+	die(1);
+    }
+    if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
+	syslog(LOG_ERR, "ioctl(establish TIOCSETD): %m");
+	die(1);
+    }
+
+    /*
+     * Find out which interface we were given.
+     */
+    if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {	
+	syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
+	die(1);
+    }
+
+    /*
+     * Enable debug in the driver if requested.
+     */
+    if (kdebugflag) {
+	if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
+	    syslog(LOG_WARNING, "ioctl(PPPIOCGFLAGS): %m");
+	} else {
+	    x |= (kdebugflag & 0xFF) * SC_DEBUG;
+	    if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
+		syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
+	}
+    }
+}
+
+
+/*
+ * disestablish_ppp - Restore the serial port to normal operation.
+ * This shouldn't call die() because it's called from die().
+ */
+void
+disestablish_ppp()
+{
+    int x;
+    char *s;
+
+    if (initdisc >= 0) {
+	/*
+	 * Check whether the link seems not to be 8-bit clean.
+	 */
+	if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
+	    s = NULL;
+	    switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
+	    case SC_RCV_B7_0:
+		s = "bit 7 set to 1";
+		break;
+	    case SC_RCV_B7_1:
+		s = "bit 7 set to 0";
+		break;
+	    case SC_RCV_EVNP:
+		s = "odd parity";
+		break;
+	    case SC_RCV_ODDP:
+		s = "even parity";
+		break;
+	    }
+	    if (s != NULL) {
+		syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
+		syslog(LOG_WARNING, "All received characters had %s", s);
+	    }
+	}
+	if (ioctl(fd, TIOCSETD, &initdisc) < 0)
+	    syslog(LOG_ERR, "ioctl(disestablish TIOCSETD): %m");
+    }
+}
+
+/*
+ * 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 B14400
+    { 14400, B14400 },
+#endif
+#ifdef B28800
+    { 28800, B28800 },
+#endif
+#ifdef B43200
+    { 43200, B43200 },
+#endif
+#ifdef B57600
+    { 57600, B57600 },
+#endif
+#ifdef B115200
+    { 115200, B115200 },
+#endif
+    { 0, 0 }
+};
+
+/*
+ * Translate from bits/second to a speed_t.
+ */
+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;
+    syslog(LOG_WARNING, "speed %d not supported", bps);
+    return 0;
+}
+
+/*
+ * Translate from a speed_t to bits/second.
+ */
+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.
+ */
+set_up_tty(fd, local)
+    int fd, local;
+{
+    int speed, x, modembits;
+    struct termios tios;
+
+    if (tcgetattr(fd, &tios) < 0) {
+	syslog(LOG_ERR, "tcgetattr: %m");
+	die(1);
+    }
+
+    if (!restore_term)
+	inittermios = tios;
+
+    tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
+
+    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 |= 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);
+    }
+
+    if (modem) {
+      modembits = TIOCM_RTS | TIOCM_CTS;
+      if (ioctl(fd, (crtscts ? TIOCMBIS : TIOCMBIC), &modembits) < 0)
+	syslog(LOG_ERR, "ioctl: TIOCMBIS/BIC: %m");
+    }
+
+    if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
+	syslog(LOG_ERR, "tcsetattr: %m");
+	die(1);
+    }
+
+   baud_rate = inspeed = baud_rate_of(speed);
+   restore_term = 1;
+}
+
+/*
+ * restore_tty - restore the terminal to the saved settings.
+ */
+void
+restore_tty()
+{
+    if (restore_term) {
+	if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
+	    if (errno != ENXIO)
+		syslog(LOG_WARNING, "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().
+ *
+ * The write hack is to get NXFax to recognize that there is
+ * activity on the port.  Not using the write nukes
+ * NXFax's capability to determine port usage.
+ *
+ */
+setdtr(fd, on)
+int fd, on;
+{
+    int modembits = TIOCM_DTR;
+
+    if (!on)
+      {
+	write(fd, " ", 1);
+	sleep(1);
+      }
+
+/*    ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits); */
+    ioctl(fd, (on? TIOCSDTR: TIOCCDTR), 0);
+}
+
+
+/*
+ * output - Output PPP packet.
+ */
+void
+output(unit, p, len)
+    int unit;
+    u_char *p;
+    int len;
+{
+    if (unit != 0)
+	MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
+    if (debug)
+	log_packet(p, len, "sent ");
+
+    if (write(fd, p, len) < 0) {
+	syslog(LOG_ERR, "write: %m");
+	die(1);
+    }
+}
+
+
+/*
+ * wait_input - wait until there is data available on fd,
+ * for the length of time specified by *timo (indefinite
+ * if timo is NULL).
+ */
+wait_input(timo)
+    struct timeval *timo;
+{
+    fd_set ready;
+    int n;
+
+    FD_ZERO(&ready);
+    FD_SET(fd, &ready);
+    n = select(fd+1, &ready, NULL, &ready, timo);
+    if (n < 0 && errno != EINTR) {
+	syslog(LOG_ERR, "select: %m");
+	die(1);
+    }
+}
+
+
+/*
+ * read_packet - get a PPP packet from the serial device.
+ */
+int
+read_packet(buf)
+    u_char *buf;
+{
+    int len;
+
+    if ((len = read(fd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
+	if (errno == EWOULDBLOCK || errno == EINTR) {
+	    MAINDEBUG((LOG_DEBUG, "read(fd): %m"));
+	    return -1;
+	}
+	syslog(LOG_ERR, "read(fd): %m");
+	die(1);
+    }
+    return 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;
+{
+    u_int x;
+    struct ifreq ifr;
+
+    strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+    ifr.ifr_mtu = mtu;
+    if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
+	syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
+	quit();
+    }
+
+    if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
+	syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
+	quit();
+    }
+
+    if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
+	syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
+	quit();
+    }
+    x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
+    x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
+    if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
+	syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
+	quit();
+    }
+}
+
+
+/*
+ * ppp_set_xaccm - set the extended transmit ACCM for the interface.
+ */
+void
+ppp_set_xaccm(unit, accm)
+    int unit;
+    ext_accm accm;
+{
+    if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
+	syslog(LOG_WARNING, "ioctl(PPPIOCSXASYNCMAP): %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 x;
+
+    if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
+	syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
+	quit();
+    }
+    if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
+	syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
+	quit();
+    }
+    if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
+	syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
+	quit();
+    }
+    x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
+    if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
+	syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
+	quit();
+    }
+}
+
+/*
+ * ccp_test - ask kernel whether a given compression method
+ * is acceptable for use.
+ */
+ccp_test(unit, opt_ptr, opt_len, for_transmit)
+    int unit, opt_len, for_transmit;
+    u_char *opt_ptr;
+{
+    struct ppp_option_data data;
+
+    data.ptr = opt_ptr;
+    data.length = opt_len;
+    data.transmit = for_transmit;
+    return ioctl(fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0;
+}
+
+/*
+ * ccp_flags_set - inform kernel about the current state of CCP.
+ */
+void
+ccp_flags_set(unit, isopen, isup)
+    int unit, isopen, isup;
+{
+    int x;
+
+    if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
+	syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
+	return;
+    }
+    x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
+    x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
+    if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
+	syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %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(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
+	syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
+	return 0;
+    }
+    return x & SC_DC_FERROR;
+}
+
+/*
+ * sifvjcomp - config tcp header compression
+ */
+int
+sifvjcomp(u, vjcomp, cidcomp, maxcid)
+    int u, vjcomp, cidcomp, maxcid;
+{
+    u_int x;
+
+    if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
+	syslog(LOG_ERR, "ioctl(PPIOCGFLAGS): %m");
+	return 0;
+    }
+    x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
+    x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
+    if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
+	syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
+	return 0;
+    }
+    if (ioctl(fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
+	syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
+	return 0;
+    }
+    return 1;
+}
+
+/*
+ * sifup - Config the interface up and enable IP packets to pass.
+ */
+#ifndef SC_ENABLE_IP
+#define SC_ENABLE_IP	0x100	/* compat for old versions of kernel code */
+#endif
+
+int
+sifup(u)
+    int u;
+{
+    struct ifreq ifr;
+    u_int x;
+    struct npioctl npi;
+
+    strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+    if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
+	syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
+	return 0;
+    }
+    ifr.ifr_flags |= IFF_UP;
+    if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
+	syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
+	return 0;
+    }
+    npi.protocol = PPP_IP;
+    npi.mode = NPMODE_PASS;
+    if (ioctl(fd, PPPIOCSNPMODE, &npi) < 0) {
+	if (errno != ENOTTY) {
+	    syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE): %m");
+	    return 0;
+	}
+	/* for backwards compatibility */
+	if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
+	    syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
+	    return 0;
+	}
+	x |= SC_ENABLE_IP;
+	if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
+	    syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
+	    return 0;
+	}
+    }
+    return 1;
+}
+
+/*
+ * sifdown - Config the interface down and disable IP.
+ */
+int
+sifdown(u)
+    int u;
+{
+    struct ifreq ifr;
+    u_int x;
+    int rv;
+    struct npioctl npi;
+
+    rv = 1;
+    npi.protocol = PPP_IP;
+    npi.mode = NPMODE_ERROR;
+    if (ioctl(fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
+	if (errno != ENOTTY) {
+	    syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE): %m");
+	    rv = 0;
+	} else {
+	    /* backwards compatibility */
+	    if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
+		syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
+		rv = 0;
+	    } else {
+		x &= ~SC_ENABLE_IP;
+		if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
+		    syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
+		    rv = 0;
+		}
+	    }
+	}
+    }
+
+    strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+    if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
+	syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
+	rv = 0;
+    } else {
+	ifr.ifr_flags &= ~IFF_UP;
+	if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
+	    syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
+	    rv = 0;
+	}
+    }
+    return rv;
+}
+
+/*
+ * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
+ * if it exists.
+ */
+#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;
+    strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+    SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
+    ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o;
+    if (ioctl(sockfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
+	syslog(LOG_ERR, "ioctl(SIOCAIFADDR): %m");
+	ret = 0;
+    }
+    ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = h;
+    if (ioctl(sockfd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
+	syslog(LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m");
+	ret = 0;
+    }
+    if (m != 0) {
+	((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = m;
+	syslog(LOG_INFO, "Setting interface mask to %s\n", ip_ntoa(m));
+	if (ioctl(sockfd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
+	    syslog(LOG_ERR, "ioctl(SIOCSIFNETMASK): %m");
+	    ret = 0;
+	}
+    }
+    return ret;
+}
+
+/*
+ * cifaddr - Clear the interface IP addresses, and delete routes
+ * through the interface if possible.
+ *
+ * N.B.: under NextStep, you can't *delete* an address on an interface,
+ * so we change it to 0.0.0.0...  A real hack.  But it simplifies
+ * reconnection on the server side.
+ */
+int
+cifaddr(u, o, h)
+    int u;
+    u_int32_t o, h;
+{
+    struct rtentry rt;
+
+#if 1
+    h = o = 0L;
+    (void) sifaddr(u, o, h, 0L);
+#endif
+    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) {
+	syslog(LOG_ERR, "ioctl(SIOCDELRT): %m");
+	return 0;
+    }
+    return 1;
+}
+
+/*
+ * sifdefaultroute - assign a default route through the address given.
+ */
+int
+sifdefaultroute(u, g)
+    int u;
+    u_int32_t g;
+{
+    return dodefaultroute(g, 's');
+}
+
+/*
+ * cifdefaultroute - delete a default route through the address given.
+ */
+int
+cifdefaultroute(u, g)
+    int u;
+    u_int32_t g;
+{
+    return dodefaultroute(g, 'c');
+}
+
+/*
+ * dodefaultroute - talk to a routing socket to add/delete a default route.
+ */
+int
+dodefaultroute(g, cmd)
+    u_int32_t g;
+    int cmd;
+{
+    struct rtentry rt;
+
+    SET_SA_FAMILY(rt.rt_dst, AF_INET);
+    ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = 0L;
+    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, (cmd == 's') ? SIOCADDRT : SIOCDELRT, &rt) < 0) {
+	syslog(LOG_ERR, "%cifdefaultroute: ioctl(%s): %m", cmd,
+	       (cmd == 's') ? "SIOCADDRT" : "SIOCDELRT");
+	return 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)) {
+	syslog(LOG_ERR, "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) {
+	syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
+	return 0;
+    }
+
+    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) {
+	syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
+	return 0;
+    }
+    return 1;
+}
+
+/*
+ * get_ether_addr - get the hardware address of an interface on the
+ * the same subnet as ipaddr.
+ */
+#define MAX_IFS		32
+
+int
+get_ether_addr(ipaddr, hwaddr)
+    u_int32_t ipaddr;
+    struct sockaddr *hwaddr;
+{
+    struct ifreq *ifr, *ifend, *ifp;
+    u_int32_t ina, mask;
+    struct ether_addr dla;
+    struct ifreq ifreq;
+    struct ifconf ifc;
+    struct ifreq ifs[MAX_IFS];
+    struct hostent *hostent;
+
+    ifc.ifc_len = sizeof(ifs);
+    ifc.ifc_req = ifs;
+    if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
+	syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
+	return 0;
+    }
+
+    /*
+     * Scan through looking for an interface with an Internet
+     * address on the same subnet as `ipaddr'.
+     */
+    ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
+    for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
+		((char *)&ifr->ifr_addr + sizeof(struct sockaddr))) {
+	if (ifr->ifr_addr.sa_family == AF_INET) {
+	    ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
+	    strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
+	    /*
+	     * Check that the interface is up, and not point-to-point
+	     * or loopback.
+	     */
+	    if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
+		continue;
+	    if ((ifreq.ifr_flags &
+		 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
+		 != (IFF_UP|IFF_BROADCAST))
+		continue;
+	    /*
+	     * Get its netmask and check that it's on the right subnet.
+	     */
+	    if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
+		continue;
+	    mask = ((struct sockaddr_in*)&ifreq.ifr_addr)->sin_addr.s_addr;
+	    if ((ipaddr & mask) != (ina & mask))
+		continue;
+
+	    break;
+	}
+    }
+
+    if (ifr >= ifend)
+	return 0;
+    syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
+
+    /*
+     * Get the hostname and look for an entry using the ethers database.
+     * Under NeXTStep this is the best we can do for now.
+     */
+    if ((hostent = gethostbyaddr((char*)&ina, sizeof(ina), AF_INET)) == NULL)
+	return 0;
+
+    if (ether_by_host(hostent->h_name, &dla)) {
+	syslog(LOG_INFO, "Add entry for %s in /etc/ethers", hostent->h_name);
+	return 0;	/* it's not there */
+    }
+    hwaddr->sa_family = AF_UNSPEC;
+    BCOPY(&dla, hwaddr->sa_data, sizeof(dla));
+    return 1;
+}
+
+int
+ether_by_host(hostname, etherptr)
+    char *hostname;
+    struct ether_addr *etherptr;
+{
+    struct ether_addr *thisptr;
+    void *conn;
+    ni_id root;
+    ni_namelist val;
+    char path[256];
+
+    if (!ether_hostton(hostname, etherptr))
+	return 0;
+    /*
+     * We shall now try and
+     * find the address in the
+     * top domain of netinfo.
+     */
+    strcat(strcpy(path, "/machines/"), hostname);
+
+    if (ni_open((void *)0, "/", &conn)
+     || ni_root(conn, &root)
+     || ni_pathsearch(conn, &root, path)
+     || ni_lookupprop(conn, &root, "en_address", &val))
+	return 1;
+
+    /*
+     * Now we can convert the returned string into an ethernet address.
+     */
+    strcpy(path, val.ni_namelist_val[0]);
+    ni_free(conn);
+    if ((thisptr = (struct ether_addr*)ether_aton(path)) == NULL)
+	return 1;
+    BCOPY(thisptr, etherptr, sizeof(struct ether_addr));
+    return 0;
+}
+
+
+
+/*
+ * 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.
+ */
+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) {
+	syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m");
+	return mask;
+    }
+    ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
+    for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
+	 	((char *)&ifr->ifr_addr + sizeof(struct sockaddr))) {
+	/*
+	 * 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.
+	 */
+	strncpy(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;
+}
+
+
+
+/*
+ * 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 */
+    (void)setsid();
+    if (!nochdir)
+	chdir("/");
+    if (!noclose) {
+	fclose(stdin);		/* don't need stdin, stdout, stderr */
+	fclose(stdout);
+	fclose(stderr);
+    }
+    return 0;
+}
+
+
+char *
+strdup(s)
+    const char *s;
+{
+    char *d = malloc(strlen(s) + 1);
+
+    if (d) strcpy(d, s);
+    return d;
+}
+
+/*
+ * This logwtmp() implementation is subject to the following copyright:
+ *
+ * Copyright (c) 1988 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#define WTMPFILE        "/usr/adm/wtmp"
+
+int
+logwtmp(line, name, host)
+    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)) {
+	(void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
+	(void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
+	(void)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);
+}
+
+/*
+ * Routines for locking and unlocking the serial device, moved here
+ * from chat.c.
+ */
+
+#define LOCK_PREFIX	"/usr/spool/uucp/LCK/LCK.."
+
+/*
+ * lock - create a lock file for the named device
+ */
+int
+lock(dev)
+    char *dev;
+{
+    int fd, pid, n;
+    char *p;
+
+    if ((p = strrchr(dev, '/')) != NULL)
+	dev = p + 1;
+    lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1);
+    if (lock_file == NULL)
+	novm("lock file name");
+    strcat(strcpy(lock_file, LOCK_PREFIX), dev);
+
+    while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
+	if (errno == EEXIST
+	    && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
+	    /* Read the lock file to find out who has the device locked */
+	    n = read(fd, &pid, sizeof(pid));
+	    if (n <= 0) {
+		syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
+		close(fd);
+	    } else {
+		if (kill(pid, 0) == -1 && errno == ESRCH) {
+		    /* pid no longer exists - remove the lock file */
+		    if (unlink(lock_file) == 0) {
+			close(fd);
+			syslog(LOG_NOTICE, "Removed stale lock on %s (pid %d)",
+			       dev, pid);
+			continue;
+		    } else
+			syslog(LOG_WARNING, "Couldn't remove stale lock on %s",
+			       dev);
+		} else
+		    syslog(LOG_NOTICE, "Device %s is locked by pid %d",
+			   dev, pid);
+	    }
+	    close(fd);
+	} else
+	    syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file);
+	free(lock_file);
+	lock_file = NULL;
+	return -1;
+    }
+
+    pid = getpid();
+    write(fd, &pid, sizeof pid);
+
+    close(fd);
+    return 0;
+}
+
+/*
+ * unlock - remove our lockfile
+ */
+void
+unlock()
+{
+    if (lock_file) {
+	unlink(lock_file);
+	free(lock_file);
+	lock_file = NULL;
+    }
+}
+
+#if defined(i386) && defined(HAS_BROKEN_IOCTL)
+int
+ioctl(fd, cmd, c)
+    int fd, cmd;
+    caddr_t c;
+{
+#undef	ioctl
+    int ret;
+
+#ifdef DEBUGIOCTL
+    int serrno;
+    u_char let, code, size;
+
+    size = (cmd >> 16) & IOCPARM_MASK;
+    let = (cmd >> 8);
+    code = cmd;
+
+    if (let == 't' && (75 <= code && code <= 90))
+    syslog(LOG_INFO, "ioctl(%d, 0x%x ('%c', %d, %d), 0x%x)\n", fd, cmd,
+	   let, code, size, c);
+#endif
+
+    ret = ioctl(fd, cmd, c);
+
+#ifdef DEBUGIOCTL
+    serrno = errno;
+    if (ret == -1)
+	syslog(LOG_INFO, "ioctl('%c', %d, %d) errno = %d (%m)\n",
+		let, code, size, errno);
+    if (let == 't' && (75 <= code && code <= 90) && (cmd & IOC_OUT)) {
+	int i, len = ((cmd >> 16) & IOCPARM_MASK);
+	for (i = 0; i < len / 4; ++i)
+		syslog(LOG_INFO, "word[%d] @ 0x%06x = 0x%x\n",
+		       i, &((int *) c)[i],((int *)c)[i]);
+    }
+    errno = serrno;
+#endif
+
+    if (ret == -1 && errno == EPERM)
+	errno = ret = 0;
+    return ret;
+}
+#endif	/* HAS_BROKEN_IOCTL */
+
+
+#if defined(FIXSIGS) && (defined (hppa) || defined(sparc))
+
+/*
+ * These redefinitions of Posix functions are necessary
+ * because HPPA systems have an OS bug that causes 
+ * sigaction to core dump:
+ *
+ * AlainF 9-Nov-1994	HACK FOR HP-PA/NEXTSTEP
+ *			sigaction(3) seems broken in the HP-PA NeXTSTEP 3.2
+ *			Posix lib. This causes pppd to SIGBUS at the expiration
+ *			of the first timeout (_sigtramp seems to invoke
+ *			the SIGALRM handler at an unreasonably low address).
+ *			All calls so sigaction(3) have been changed to calls
+ *			to sigvec(2) and sigprocmask(SIG_BLOCK,...) to
+ *			sigblock(2).
+ *			This is kind of a hack, especially since there are
+ *			other routines of the Posix lib still used, but
+ *			it worked for me.
+ *
+ * Dave Hess <David-Hess@net.tamu.edu> noted that 3.3 Sparc seems to
+ * have the same bug.  Thus this fix has been enabled for SPARC also.
+ *
+ *
+ */
+
+int sigemptyset(sigset_t *mask)
+{
+  *mask = 0;
+}
+
+sigaddset(sigset_t *mask, int which_sig)
+{
+  *mask |= sigmask(which_sig);
+}
+
+
+int sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
+{
+   struct sigvec sv;
+   static int in = 0;
+
+   sv.sv_handler = act->sa_handler;
+   sv.sv_mask = act->sa_mask;
+   sv.sv_flags = 0;
+
+   if (!in)
+     {
+       in = 1;
+       syslog(LOG_WARNING, "PPPD: Inside modified HP and SPARC sigaction\n");
+     }
+
+   return sigvec(sig, &sv, NULL);
+}
+
+#endif