Bring pppd from ppp-2.2 onto the mainline..

(more work needs to be done here, I'm trying to beat the supscan)

1 files changed, 458 insertions, 70 deletions

diff --git a/usr.sbin/pppd/sys-bsd.c b/usr.sbin/pppd/sys-bsd.c
index 1539ee8..eea6125 100644
--- a/usr.sbin/pppd/sys-bsd.c
+++ b/usr.sbin/pppd/sys-bsd.c
@@ -19,21 +19,28 @@
  */
 
 #ifndef lint
-static char rcsid[] = "$Id: sys-bsd.c,v 1.3 1995/05/30 03:51:16 rgrimes Exp $";
+static char rcsid[] = "$Id: sys-bsd.c,v 1.21 1995/08/16 01:40:23 paulus Exp $";
 #endif
 
 /*
  * TODO:
  */
 
+#include <stdio.h>
 #include <syslog.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <termios.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/time.h>
-#include <sys/errno.h>
+#include <sys/stat.h>
 
 #include <net/if.h>
+#include <net/ppp_defs.h>
 #include <net/if_ppp.h>
 #include <net/route.h>
 #include <net/if_dl.h>
@@ -44,12 +51,75 @@ static char rcsid[] = "$Id: sys-bsd.c,v 1.3 1995/05/30 03:51:16 rgrimes Exp $";
 #endif
 
 #include "pppd.h"
-#include "ppp.h"
 
-static int initdisc = -1;		/* Initial TTY discipline */
-extern int kdebugflag;
+static int initdisc = -1;	/* Initial TTY discipline */
 static int rtm_seq;
 
+static int	restore_term;	/* 1 => we've munged the terminal */
+static struct termios inittermios; /* Initial TTY termios */
+static struct winsize wsinfo;	/* Initial window size info */
+
+static char *lock_file;		/* name of lock file created */
+
+int sockfd;			/* socket for doing interface ioctls */
+
+/*
+ * 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;
+    extern char *no_ppp_msg;
+
+    if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
+	return 1;		/* can't tell */
+
+    strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
+    ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
+    close(s);
+
+    no_ppp_msg = "\
+This system lacks kernel support for PPP.  To include PPP support\n\
+in the kernel, please follow the steps detailed in the README.bsd\n\
+file in the ppp-2.2 distribution.\n";
+    return ok;
+}
+
 /*
  * establish_ppp - Turn the serial port into a ppp interface.
  */
@@ -71,7 +141,7 @@ establish_ppp()
     /*
      * Find out which interface we were given.
      */
-    if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
+    if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {	
 	syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
 	die(1);
     }
@@ -133,6 +203,111 @@ disestablish_ppp()
 
 
 /*
+ * 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.
+ *
+ * For *BSD, we assume that speed_t values numerically equal bits/second.
+ */
+set_up_tty(fd, local)
+    int fd, local;
+{
+    struct termios tios;
+
+    if (tcgetattr(fd, &tios) < 0) {
+	syslog(LOG_ERR, "tcgetattr: %m");
+	die(1);
+    }
+
+    if (!restore_term) {
+	inittermios = tios;
+	ioctl(fd, TIOCGWINSZ, &wsinfo);
+    }
+
+    tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
+    if (crtscts > 0)
+	tios.c_cflag |= CRTSCTS;
+    else if (crtscts < 0)
+	tios.c_cflag &= ~CRTSCTS;
+
+    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 */
+    }
+
+    if (inspeed) {
+	cfsetospeed(&tios, inspeed);
+	cfsetispeed(&tios, inspeed);
+    } else {
+	inspeed = cfgetospeed(&tios);
+	/*
+	 * We can't proceed if the serial port speed is 0,
+	 * since that implies that the serial port is disabled.
+	 */
+	if (inspeed == 0) {
+	    syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
+		   devnam);
+	    die(1);
+	}
+    }
+    baud_rate = inspeed;
+
+    if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
+	syslog(LOG_ERR, "tcsetattr: %m");
+	die(1);
+    }
+
+    restore_term = 1;
+}
+
+/*
+ * restore_tty - restore the terminal to the saved settings.
+ */
+void
+restore_tty()
+{
+    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)
+		syslog(LOG_WARNING, "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().
+ */
+setdtr(fd, on)
+int fd, on;
+{
+    int modembits = TIOCM_DTR;
+
+    ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
+}
+
+
+/*
  * output - Output PPP packet.
  */
 void
@@ -154,6 +329,27 @@ output(unit, p, len)
 
 
 /*
+ * 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
@@ -162,11 +358,9 @@ read_packet(buf)
 {
     int len;
 
-    if ((len = read(fd, buf, MTU + DLLHEADERLEN)) < 0) {
-	if (errno == EWOULDBLOCK) {
-	    MAINDEBUG((LOG_DEBUG, "read(fd): EWOULDBLOCK"));
+    if ((len = read(fd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
+	if (errno == EWOULDBLOCK || errno == EINTR)
 	    return -1;
-	}
 	syslog(LOG_ERR, "read(fd): %m");
 	die(1);
     }
@@ -181,7 +375,7 @@ read_packet(buf)
 void
 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
     int unit, mtu;
-    u_long asyncmap;
+    u_int32_t asyncmap;
     int pcomp, accomp;
 {
     u_int x;
@@ -189,7 +383,7 @@ ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
 
     strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
     ifr.ifr_mtu = mtu;
-    if (ioctl(s, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
+    if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
 	syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
 	quit();
     }
@@ -232,7 +426,7 @@ ppp_set_xaccm(unit, accm)
 void
 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
     int unit, mru;
-    u_long asyncmap;
+    u_int32_t asyncmap;
     int pcomp, accomp;
 {
     int x;
@@ -257,6 +451,59 @@ ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
 }
 
 /*
+ * 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
@@ -285,31 +532,45 @@ sifvjcomp(u, vjcomp, cidcomp, maxcid)
 /*
  * 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(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
+    if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
 	syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
 	return 0;
     }
     ifr.ifr_flags |= IFF_UP;
-    if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
+    if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
 	syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
 	return 0;
     }
-    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;
+    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;
 }
@@ -324,25 +585,37 @@ sifdown(u)
     struct ifreq ifr;
     u_int x;
     int rv;
+    struct npioctl npi;
 
     rv = 1;
-    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");
+    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(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
+    if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
 	syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
 	rv = 0;
     } else {
 	ifr.ifr_flags &= ~IFF_UP;
-	if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
+	if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
 	    syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
 	    rv = 0;
 	}
@@ -365,7 +638,7 @@ sifdown(u)
 int
 sifaddr(u, o, h, m)
     int u;
-    u_long o, h, m;
+    u_int32_t o, h, m;
 {
     struct ifaliasreq ifra;
 
@@ -379,7 +652,7 @@ sifaddr(u, o, h, m)
 	((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
     } else
 	BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
-    if (ioctl(s, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
+    if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
 	if (errno != EEXIST) {
 	    syslog(LOG_ERR, "ioctl(SIOCAIFADDR): %m");
 	    return 0;
@@ -396,7 +669,7 @@ sifaddr(u, o, h, m)
 int
 cifaddr(u, o, h)
     int u;
-    u_long o, h;
+    u_int32_t o, h;
 {
     struct ifaliasreq ifra;
 
@@ -406,21 +679,20 @@ cifaddr(u, o, h)
     SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
     ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
     BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
-    if (ioctl(s, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
+    if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
 	syslog(LOG_WARNING, "ioctl(SIOCDIFADDR): %m");
 	return 0;
     }
     return 1;
 }
 
-
 /*
  * sifdefaultroute - assign a default route through the address given.
  */
 int
 sifdefaultroute(u, g)
     int u;
-    u_long g;
+    u_int32_t g;
 {
     return dodefaultroute(g, 's');
 }
@@ -431,7 +703,7 @@ sifdefaultroute(u, g)
 int
 cifdefaultroute(u, g)
     int u;
-    u_long g;
+    u_int32_t g;
 {
     return dodefaultroute(g, 'c');
 }
@@ -441,7 +713,7 @@ cifdefaultroute(u, g)
  */
 int
 dodefaultroute(g, cmd)
-    u_long g;
+    u_int32_t g;
     int cmd;
 {
     int routes;
@@ -499,7 +771,7 @@ static int arpmsg_valid;
 int
 sifproxyarp(unit, hisaddr)
     int unit;
-    u_long hisaddr;
+    u_int32_t hisaddr;
 {
     int routes;
     int l;
@@ -549,7 +821,7 @@ sifproxyarp(unit, hisaddr)
 int
 cifproxyarp(unit, hisaddr)
     int unit;
-    u_long hisaddr;
+    u_int32_t hisaddr;
 {
     int routes;
 
@@ -583,7 +855,7 @@ cifproxyarp(unit, hisaddr)
 int
 sifproxyarp(unit, hisaddr)
     int unit;
-    u_long hisaddr;
+    u_int32_t hisaddr;
 {
     struct arpreq arpreq;
     struct {
@@ -608,7 +880,7 @@ sifproxyarp(unit, hisaddr)
     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(s, SIOCSARP, (caddr_t)&arpreq) < 0) {
+    if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
 	syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
 	return 0;
     }
@@ -622,14 +894,14 @@ sifproxyarp(unit, hisaddr)
 int
 cifproxyarp(unit, hisaddr)
     int unit;
-    u_long hisaddr;
+    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(s, SIOCDARP, (caddr_t)&arpreq) < 0) {
+    if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
 	syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
 	return 0;
     }
@@ -639,12 +911,6 @@ cifproxyarp(unit, hisaddr)
 
 
 /*
- * How to find the next ifreq structure in the stuff returned by SIOCGIFCONF.
- */
-#define next_ifreq(ifr)	\
-    ((struct ifreq *) ((char *)&(ifr)->ifr_addr + (ifr)->ifr_addr.sa_len))
-
-/*
  * get_ether_addr - get the hardware address of an interface on the
  * the same subnet as ipaddr.
  */
@@ -652,11 +918,11 @@ cifproxyarp(unit, hisaddr)
 
 int
 get_ether_addr(ipaddr, hwaddr)
-    u_long ipaddr;
+    u_int32_t ipaddr;
     struct sockaddr_dl *hwaddr;
 {
     struct ifreq *ifr, *ifend, *ifp;
-    u_long ina, mask;
+    u_int32_t ina, mask;
     struct sockaddr_dl *dla;
     struct ifreq ifreq;
     struct ifconf ifc;
@@ -664,7 +930,7 @@ get_ether_addr(ipaddr, hwaddr)
 
     ifc.ifc_len = sizeof(ifs);
     ifc.ifc_req = ifs;
-    if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
+    if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
 	syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
 	return 0;
     }
@@ -674,7 +940,8 @@ get_ether_addr(ipaddr, hwaddr)
      * address on the same subnet as `ipaddr'.
      */
     ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
-    for (ifr = ifc.ifc_req; ifr < ifend; ifr = next_ifreq(ifr)) {
+    for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
+	 	((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
 	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));
@@ -682,7 +949,7 @@ get_ether_addr(ipaddr, hwaddr)
 	     * Check that the interface is up, and not point-to-point
 	     * or loopback.
 	     */
-	    if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0)
+	    if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
 		continue;
 	    if ((ifreq.ifr_flags &
 		 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
@@ -691,7 +958,7 @@ get_ether_addr(ipaddr, hwaddr)
 	    /*
 	     * Get its netmask and check that it's on the right subnet.
 	     */
-	    if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0)
+	    if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
 		continue;
 	    mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
 	    if ((ipaddr & mask) != (ina & mask))
@@ -710,7 +977,7 @@ get_ether_addr(ipaddr, hwaddr)
      * for this interface.
      */
     ifp = ifr;
-    for (ifr = ifc.ifc_req; ifr < ifend; ifr = next_ifreq(ifr)) {
+    for (ifr = ifc.ifc_req; ifr < ifend; ) {
 	if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
 	    && ifr->ifr_addr.sa_family == AF_LINK) {
 	    /*
@@ -720,28 +987,149 @@ get_ether_addr(ipaddr, hwaddr)
 	    BCOPY(dla, hwaddr, dla->sdl_len);
 	    return 1;
 	}
+	ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
     }
 
     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 + ifr->ifr_addr.sa_len)) {
+	/*
+	 * 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;
+}
 
 /*
- * ppp_available - check whether the system has any ppp interfaces
- * (in fact we check whether we can do an ioctl on ppp0).
+ * lock - create a lock file for the named lock device
  */
+#define	LOCK_PREFIX	"/var/spool/lock/LCK.."
+
 int
-ppp_available()
+lock(dev)
+    char *dev;
 {
-    int s, ok;
-    struct ifreq ifr;
+    char hdb_lock_buffer[12];
+    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, hdb_lock_buffer, 11);
+	    if (n > 0) {
+		hdb_lock_buffer[n] = 0;
+		pid = atoi(hdb_lock_buffer);
+	    }
+	    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;
+    }
 
-    if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
-	return 1;		/* can't tell - maybe we're not root */
+    sprintf(hdb_lock_buffer, "%10d\n", getpid());
+    write(fd, hdb_lock_buffer, 11);
 
-    strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
-    ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
-    close(s);
+    close(fd);
+    return 0;
+}
 
-    return ok;
+/*
+ * unlock - remove our lockfile
+ */
+unlock()
+{
+    if (lock_file) {
+	unlink(lock_file);
+	free(lock_file);
+	lock_file = NULL;
+    }
 }