* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-/*
- * TODO:
- */
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/errno.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/utsname.h>
#include <stdio.h>
+#include <stdlib.h>
#include <syslog.h>
#include <string.h>
#include <time.h>
#include <memory.h>
#include <utmp.h>
-#include <sys/ioctl.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/time.h>
-#include <sys/errno.h>
#include <mntent.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <termios.h>
+#include <unistd.h>
+
+/* This is in netdevice.h. However, this compile will fail miserably if
+ you attempt to include netdevice.h because it has so many references
+ to __memcpy functions which it should not attempt to do. So, since I
+ really don't use it, but it must be defined, define it now. */
+
+#ifndef MAX_ADDR_LEN
+#define MAX_ADDR_LEN 7
+#endif
+#if __GLIBC__ >= 2
+#include <asm/types.h> /* glibc 2 conflicts with linux/types.h */
#include <net/if.h>
-#include <linux/ppp.h>
+#include <net/if_arp.h>
+#include <net/route.h>
+#include <netinet/if_ether.h>
+#else
+#include <linux/types.h>
+#include <linux/if.h>
+#include <linux/if_arp.h>
#include <linux/route.h>
#include <linux/if_ether.h>
+#endif
#include <netinet/in.h>
-#include <net/if_ppp.h>
+#include <arpa/inet.h>
+
+#include <linux/ppp_defs.h>
+#include <linux/if_ppp.h>
#include "pppd.h"
-#include "ppp.h"
#include "fsm.h"
#include "ipcp.h"
+#include "patchlevel.h"
+
+#ifdef IPX_CHANGE
+#include "ipxcp.h"
+#if __GLIBC__ >= 2 && \
+ !(defined(__powerpc__) && __GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
+#include <netipx/ipx.h>
+#else
+#include <linux/ipx.h>
+#endif
+#endif /* IPX_CHANGE */
-static int initdisc = -1; /* Initial TTY discipline */
-static int prev_kdebugflag = 0;
-extern int kdebugflag;
-extern u_long netmask;
+#ifdef LOCKLIB
+#include <sys/locks.h>
+#endif
+
+#ifndef RTF_DEFAULT /* Normally in <linux/route.h> from <net/route.h> */
+#define RTF_DEFAULT 0
+#endif
-#define MAX_IFS 32
+/* We can get an EIO error on an ioctl if the modem has hung up */
+#define ok_error(num) ((num)==EIO)
+
+static int tty_disc = N_TTY; /* The TTY discipline */
+static int ppp_disc = N_PPP; /* The PPP discpline */
+static int initfdflags = -1; /* Initial file descriptor flags for fd */
+static int ppp_fd = -1; /* fd which is set to PPP discipline */
+static int sock_fd = -1; /* socket for doing interface ioctls */
+static int slave_fd = -1;
+static int master_fd = -1;
+
+static fd_set in_fds; /* set of fds that wait_input waits for */
+static int max_in_fd; /* highest fd set in in_fds */
+
+static int has_proxy_arp = 0;
+static int driver_version = 0;
+static int driver_modification = 0;
+static int driver_patch = 0;
+static int driver_is_old = 0;
+static int restore_term = 0; /* 1 => we've munged the terminal */
+static struct termios inittermios; /* Initial TTY termios */
+
+static char loop_name[20];
+static unsigned char inbuf[512]; /* buffer for chars read from loopback */
+
+static int if_is_up; /* Interface has been marked up */
+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 */
+static char proxy_arp_dev[16]; /* Device for proxy arp entry */
+
+static char *lock_file;
+
+static struct utsname utsname; /* for the kernel version */
+static int kernel_version;
+#define KVERSION(j,n,p) ((j)*1000000 + (n)*1000 + (p))
+
+#define MAX_IFS 100
+
+#define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
+#define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
+ IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
+
+/* Prototypes for procedures local to this file. */
+static int get_flags (void);
+static void set_flags (int flags);
+static int translate_speed (int bps);
+static int baud_rate_of (int speed);
+static char *path_to_route (void);
+static void close_route_table (void);
+static int open_route_table (void);
+static int read_route_table (struct rtentry *rt);
+static int defaultroute_exists (struct rtentry *rt);
+static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr,
+ char *name, int namelen);
+static void decode_version (char *buf, int *version, int *mod, int *patch);
+static int set_kdebugflag(int level);
+static int ppp_registered(void);
-/* prototypes */
-void die __ARGS((int));
+extern u_char inpacket_buf[]; /* borrowed from main.c */
/*
* SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
addr.sa_family = (family);
/*
- * set_kdebugflag - Define the debugging level for the kernel
+ * Determine if the PPP connection should still be present.
*/
-int set_kdebugflag (int requested_level)
+extern int hungup;
+
+#ifndef LOCK_PREFIX
+#define LOCK_PREFIX "/var/lock/LCK.."
+#endif
+
+static void set_ppp_fd (int new_fd)
{
- if (ioctl(fd, PPPIOCGDEBUG, &prev_kdebugflag) < 0) {
- syslog(LOG_ERR, "ioctl(PPPIOCGDEBUG): %m");
- return (0);
- }
+ SYSDEBUG ((LOG_DEBUG, "setting ppp_fd to %d\n", new_fd));
+ ppp_fd = new_fd;
+}
- if (prev_kdebugflag != requested_level) {
- if (ioctl(fd, PPPIOCSDEBUG, &requested_level) < 0) {
- syslog (LOG_ERR, "ioctl(PPPIOCSDEBUG): %m");
- return (0);
+static int still_ppp(void)
+{
+ if (!hungup || ppp_fd == slave_fd)
+ return 1;
+ if (slave_fd >= 0) {
+ set_ppp_fd(slave_fd);
+ return 1;
}
- syslog(LOG_INFO, "set kernel debugging level to %d", requested_level);
+ return 0;
+}
+
+/********************************************************************
+ *
+ * Functions to read and set the flags value in the device driver
+ */
+
+static int get_flags (void)
+{
+ int flags;
+
+ if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
+ if ( ok_error (errno) )
+ flags = 0;
+ else
+ fatal("ioctl(PPPIOCGFLAGS): %m");
}
- return (1);
+
+ SYSDEBUG ((LOG_DEBUG, "get flags = %x\n", flags));
+ return flags;
+}
+
+/********************************************************************/
+
+static void set_flags (int flags)
+{
+ SYSDEBUG ((LOG_DEBUG, "set flags = %x\n", flags));
+
+ if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0) {
+ if (! ok_error (errno) )
+ fatal("ioctl(PPPIOCSFLAGS, %x): %m(%d)", flags, errno);
+ }
+}
+
+/********************************************************************
+ *
+ * sys_init - System-dependent initialization.
+ */
+
+void sys_init(void)
+{
+ int osmaj, osmin, ospatch;
+
+ 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 ioctls. */
+ sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock_fd < 0) {
+ if ( ! ok_error ( errno ))
+ fatal("Couldn't create IP socket: %m(%d)", errno);
+ }
+
+ FD_ZERO(&in_fds);
+ max_in_fd = 0;
+
+ uname(&utsname);
+ osmaj = osmin = ospatch = 0;
+ sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch);
+ kernel_version = KVERSION(osmaj, osmin, ospatch);
}
+/********************************************************************
+ *
+ * sys_cleanup - restore any system state we modified before exiting:
+ * mark the interface down, delete default route and/or proxy arp entry.
+ * This shouldn't call die() because it's called from die().
+ */
+
+void sys_cleanup(void)
+{
/*
- * establish_ppp - Turn the serial port into a ppp interface.
+ * Take down the device
*/
+ if (if_is_up)
+ sifdown(0);
+/*
+ * Delete any routes through the device.
+ */
+ if (default_route_gateway != 0)
+ cifdefaultroute(0, 0, default_route_gateway);
+
+ if (has_proxy_arp)
+ cifproxyarp(0, proxy_arp_addr);
+}
-void establish_ppp (void)
+/********************************************************************
+ *
+ * sys_close - Clean up in a child process before execing.
+ */
+void
+sys_close(void)
{
- int pppdisc = N_PPP;
- int sig = SIGIO;
+ if (sock_fd >= 0)
+ close(sock_fd);
+ if (slave_fd >= 0)
+ close(slave_fd);
+ if (master_fd >= 0)
+ close(master_fd);
+ closelog();
+}
- if (ioctl(fd, TIOCEXCL, 0) < 0) {
- syslog (LOG_WARNING, "ioctl(TIOCEXCL): %m");
+/********************************************************************
+ *
+ * set_kdebugflag - Define the debugging level for the kernel
+ */
+
+static int set_kdebugflag (int requested_level)
+{
+ if (ioctl(ppp_fd, PPPIOCSDEBUG, &requested_level) < 0) {
+ if ( ! ok_error (errno) )
+ error("ioctl(PPPIOCSDEBUG): %m");
+ return (0);
}
+ SYSDEBUG ((LOG_INFO, "set kernel debugging level to %d",
+ requested_level));
+ return (1);
+}
- if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
- syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
- die (1);
+/********************************************************************
+ *
+ * establish_ppp - Turn the serial port into a ppp interface.
+ */
+
+int establish_ppp (int tty_fd)
+{
+ int x;
+/*
+ * The current PPP device will be the tty file.
+ */
+ set_ppp_fd (tty_fd);
+/*
+ * Ensure that the tty device is in exclusive mode.
+ */
+ if (ioctl(tty_fd, TIOCEXCL, 0) < 0) {
+ if ( ! ok_error ( errno ))
+ warn("ioctl(TIOCEXCL): %m");
}
-
- if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
- syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
- die (1);
+/*
+ * Demand mode - prime the old ppp device to relinquish the unit.
+ */
+ if (demand && ioctl(slave_fd, PPPIOCXFERUNIT, 0) < 0)
+ fatal("ioctl(transfer ppp unit): %m(%d)", errno);
+/*
+ * Set the current tty to the PPP discpline
+ */
+ if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0) {
+ if ( ! ok_error (errno) )
+ fatal("ioctl(TIOCSETD): %m(%d)", errno);
}
-
- if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
- syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
- die (1);
+/*
+ * Find out which interface we were given.
+ */
+ if (ioctl(ppp_fd, PPPIOCGUNIT, &x) < 0) {
+ if ( ! ok_error (errno))
+ fatal("ioctl(PPPIOCGUNIT): %m(%d)", errno);
+ }
+/*
+ * Check that we got the same unit again.
+ */
+ if (demand) {
+ if (x != ifunit)
+ fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
}
- set_kdebugflag (kdebugflag);
+ ifunit = x;
+/*
+ * Enable debug in the driver if requested.
+ */
+ if (!demand)
+ set_kdebugflag (kdebugflag);
- /*
- * Set the device to give us a SIGIO when data is available.
- */
- if (ioctl(fd, PPPIOCSINPSIG, &sig) == -1) {
- syslog(LOG_ERR, "ioctl(PPPIOCSINPSIG): %m");
- die(1);
+ set_flags (get_flags() & ~(SC_RCV_B7_0 | SC_RCV_B7_1 |
+ SC_RCV_EVNP | SC_RCV_ODDP));
+
+ SYSDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver",
+ driver_version, driver_modification, driver_patch));
+/*
+ * Fetch the initial file flags and reset blocking mode on the file.
+ */
+ initfdflags = fcntl(ppp_fd, F_GETFL);
+
+ if (initfdflags == -1 ||
+ fcntl(ppp_fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
+ if ( ! ok_error (errno))
+ warn("Couldn't set device to non-blocking mode: %m");
}
+
+ return ppp_fd;
}
-/*
+/********************************************************************
+ *
* disestablish_ppp - Restore the serial port to normal operation.
* This shouldn't call die() because it's called from die().
*/
-void disestablish_ppp(void)
+void disestablish_ppp(int tty_fd)
+{
+/*
+ * Attempt to restore the previous tty settings
+ */
+ if (!hungup) {
+/*
+ * Restore the previous line discipline
+ */
+ if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0) {
+ if ( ! ok_error (errno))
+ error("ioctl(TIOCSETD, N_TTY): %m");
+ }
+
+ if (ioctl(tty_fd, TIOCNXCL, 0) < 0) {
+ if ( ! ok_error (errno))
+ warn("ioctl(TIOCNXCL): %m(%d)", errno);
+ }
+
+ /* Reset non-blocking mode on fd. */
+ if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0) {
+ if ( ! ok_error (errno))
+ warn("Couldn't restore device fd flags: %m");
+ }
+ }
+ initfdflags = -1;
+}
+
+/********************************************************************
+ *
+ * clean_check - Fetch the flags for the device and generate
+ * appropriate error messages.
+ */
+void clean_check(void)
{
int x;
char *s;
- if (initdisc >= 0) {
- set_kdebugflag (prev_kdebugflag);
- /*
- * Check whether the link seems not to be 8-bit clean.
- */
- if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
+ if (still_ppp()) {
+ if (ioctl(ppp_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";
+ case SC_RCV_B7_0 | SC_RCV_EVNP:
+ case SC_RCV_B7_0 | SC_RCV_ODDP:
+ case SC_RCV_B7_0 | SC_RCV_ODDP | SC_RCV_EVNP:
+ s = "all had bit 7 set to 1";
break;
+
case SC_RCV_B7_1:
- s = "bit 7 set to 0";
+ case SC_RCV_B7_1 | SC_RCV_EVNP:
+ case SC_RCV_B7_1 | SC_RCV_ODDP:
+ case SC_RCV_B7_1 | SC_RCV_ODDP | SC_RCV_EVNP:
+ s = "all had bit 7 set to 0";
break;
+
case SC_RCV_EVNP:
- s = "odd parity";
+ s = "all had odd parity";
break;
+
case SC_RCV_ODDP:
- s = "even parity";
+ s = "all had 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);
+ warn("Receive serial link is not 8-bit clean:");
+ warn("Problem: %s", s);
}
}
-
- if (ioctl(fd, TIOCSETD, &initdisc) < 0)
- syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
-
- if (ioctl(fd, TIOCNXCL, 0) < 0)
- syslog (LOG_WARNING, "ioctl(TIOCNXCL): %m");
-
- initdisc = -1;
}
}
+
/*
- * output - Output PPP packet.
+ * List of valid speeds.
*/
-void output (int unit, unsigned char *p, int len)
+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 B57600
+ { 57600, B57600 },
+#endif
+#ifdef B115200
+ { 115200, B115200 },
+#endif
+#ifdef EXTA
+ { 19200, EXTA },
+#endif
+#ifdef EXTB
+ { 38400, EXTB },
+#endif
+#ifdef B230400
+ { 230400, B230400 },
+#endif
+#ifdef B460800
+ { 460800, B460800 },
+#endif
+ { 0, 0 }
+};
+
+/********************************************************************
+ *
+ * Translate from bits/second to a speed_t.
+ */
+
+static int translate_speed (int bps)
{
- if (unit != 0)
- MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
+ struct speed *speedp;
- if (debug)
- log_packet(p, len, "sent ");
-
- if (write(fd, p, len) < 0) {
- syslog(LOG_ERR, "write: %m");
- die(1);
+ if (bps != 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;
}
-/*
- * read_packet - get a PPP packet from the serial device.
+/********************************************************************
+ *
+ * Translate from a speed_t to bits/second.
*/
-int read_packet (unsigned char *buf)
+static int baud_rate_of (int speed)
{
- int len;
-
- len = read(fd, buf, MTU + DLLHEADERLEN);
- if (len < 0) {
- if (errno == EWOULDBLOCK) {
-#if 0
- MAINDEBUG((LOG_DEBUG, "read(fd): EWOULDBLOCK"));
-#endif
- return -1;
+ struct speed *speedp;
+
+ if (speed != 0) {
+ for (speedp = speeds; speedp->speed_int; speedp++) {
+ if (speed == speedp->speed_val)
+ return speedp->speed_int;
}
- syslog(LOG_ERR, "read(fd): %m");
- die(1);
}
- return len;
+ return 0;
}
-/*
- * ppp_send_config - configure the transmit characteristics of
- * the ppp interface.
+/********************************************************************
+ *
+ * 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 ppp_send_config (int unit,int mtu,u_long asyncmap,int pcomp,int accomp)
-{
- u_int x;
- struct ifreq ifr;
-
- MAINDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
- strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
- ifr.ifr_mtu = mtu;
- if (ioctl(s, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
- syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
- quit();
- }
- MAINDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
- if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
- syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
- quit();
+void set_up_tty(int tty_fd, int local)
+{
+ int speed;
+ struct termios tios;
+
+ setdtr(tty_fd, 1);
+ if (tcgetattr(tty_fd, &tios) < 0) {
+ if (!ok_error(errno))
+ fatal("tcgetattr: %m(%d)", errno);
+ return;
}
- if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
- syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
- quit();
+ if (!restore_term)
+ inittermios = tios;
+
+ tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
+ tios.c_cflag |= CS8 | CREAD | HUPCL;
+
+ tios.c_iflag = IGNBRK | IGNPAR;
+ tios.c_oflag = 0;
+ tios.c_lflag = 0;
+ tios.c_cc[VMIN] = 1;
+ tios.c_cc[VTIME] = 0;
+
+ if (local || !modem)
+ tios.c_cflag ^= (CLOCAL | HUPCL);
+
+ switch (crtscts) {
+ case 1:
+ tios.c_cflag |= CRTSCTS;
+ break;
+
+ case -2:
+ tios.c_iflag |= IXON | IXOFF;
+ tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
+ tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
+ break;
+
+ case -1:
+ tios.c_cflag &= ~CRTSCTS;
+ break;
+
+ default:
+ break;
}
-
- x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
- x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
-
- MAINDEBUG ((LOG_DEBUG, "send_config: flags = %x\n", x));
- if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
- syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
- quit();
+
+ speed = translate_speed(inspeed);
+ if (speed) {
+ cfsetospeed (&tios, speed);
+ cfsetispeed (&tios, speed);
}
-}
-
/*
- * ppp_set_xaccm - set the extended transmit ACCM for the interface.
+ * We can't proceed if the serial port speed is B0,
+ * since that implies that the serial port is disabled.
*/
-void
-ppp_set_xaccm(unit, accm)
- int unit;
- ext_accm accm;
-{
- MAINDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
- accm[0], accm[1], accm[2], accm[3]));
- if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
- syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
+ else {
+ speed = cfgetospeed(&tios);
+ if (speed == B0)
+ fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
+ }
+
+ if (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0)
+ if (!ok_error(errno))
+ fatal("tcsetattr: %m");
+
+ baud_rate = baud_rate_of(speed);
+ restore_term = 1;
}
-/*
- * ppp_recv_config - configure the receive-side characteristics of
- * the ppp interface.
+/********************************************************************
+ *
+ * setdtr - control the DTR line on the serial port.
+ * This is called from die(), so it shouldn't call die().
*/
-void ppp_recv_config (int unit,int mru,u_long asyncmap,int pcomp,int accomp)
+
+void setdtr (int tty_fd, int on)
{
- u_int x;
+ int modembits = TIOCM_DTR;
- MAINDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
- if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
- syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
+ ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
+}
- MAINDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
- if (ioctl(fd, PPPIOCRASYNCMAP, (caddr_t) &asyncmap) < 0) {
- syslog(LOG_ERR, "ioctl(PPPIOCRASYNCMAP): %m");
- quit();
- }
-
- if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
- syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
- quit();
- }
+/********************************************************************
+ *
+ * restore_tty - restore the terminal to the saved settings.
+ */
- x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
- MAINDEBUG ((LOG_DEBUG, "recv_config: flags = %x\n", x));
- if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
- syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
- quit();
+void restore_tty (int tty_fd)
+{
+ if (restore_term) {
+ restore_term = 0;
+/*
+ * 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.
+ */
+ if (!default_device)
+ inittermios.c_lflag &= ~(ECHO | ECHONL);
+
+ if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0) {
+ if (! ok_error (errno))
+ warn("tcsetattr: %m");
+ }
}
}
-/*
- * sifvjcomp - config tcp header compression
+/********************************************************************
+ *
+ * output - Output PPP packet.
*/
-int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
+void output (int unit, unsigned char *p, int len)
{
- u_int x;
-
- if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
- syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
- return 0;
+ if (debug)
+ dbglog("sent %P", p, len);
+
+ if (write(ppp_fd, p, len) < 0) {
+ if (errno == EWOULDBLOCK || errno == ENOBUFS
+ || errno == ENXIO || errno == EIO || errno == EINTR)
+ warn("write: warning: %m (%d)", errno);
+ else
+ error("write: %m (%d)", errno);
}
+}
- x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
- x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
+/********************************************************************
+ *
+ * wait_input - wait until there is data available,
+ * for the length of time specified by *timo (indefinite
+ * if timo is NULL).
+ */
- if(ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
- syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
- return 0;
- }
+void wait_input(struct timeval *timo)
+{
+ fd_set ready;
+ int n;
- if (vjcomp) {
- if (ioctl (fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
- syslog (LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
- return 0;
- }
- }
+ ready = in_fds;
+ n = select(max_in_fd + 1, &ready, NULL, &ready, timo);
+ if (n < 0 && errno != EINTR)
+ fatal("select: %m(%d)", errno);
+}
- return 1;
+/*
+ * add_fd - add an fd to the set that wait_input waits for.
+ */
+void add_fd(int fd)
+{
+ FD_SET(fd, &in_fds);
+ if (fd > max_in_fd)
+ max_in_fd = fd;
}
/*
+ * remove_fd - remove an fd from the set that wait_input waits for.
+ */
+void remove_fd(int fd)
+{
+ FD_CLR(fd, &in_fds);
+}
+
+#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;
+{
+ fd_set ready;
+ int n;
+
+ FD_ZERO(&ready);
+ FD_SET(master_fd, &ready);
+ n = select(master_fd + 1, &ready, NULL, &ready, timo);
+ if (n < 0 && errno != EINTR)
+ fatal("select: %m(%d)", errno);
+}
+
+/********************************************************************
+ *
+ * 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(%d)", errno);
+}
+#endif
+
+/********************************************************************
+ *
+ * read_packet - get a PPP packet from the serial device.
+ */
+
+int read_packet (unsigned char *buf)
+{
+ int len;
+
+ len = read(ppp_fd, buf, PPP_MTU + PPP_HDRLEN);
+ if (len < 0) {
+ if (errno == EWOULDBLOCK || errno == EIO)
+ return -1;
+ fatal("read: %m(%d)", errno);
+ }
+ return 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(void)
+{
+ int rv = 0;
+ int n = read(master_fd, inbuf, sizeof(inbuf));
+
+ while (n > 0) {
+ if (loop_chars(inbuf, n))
+ rv = 1;
+ n = read(master_fd, inbuf, sizeof(inbuf));
+ }
+
+ if (n == 0)
+ fatal("eof on loopback");
+
+ if (errno != EWOULDBLOCK)
+ fatal("read from loopback: %m(%d)", errno);
+
+ return rv;
+}
+
+/********************************************************************
+ *
+ * ppp_send_config - configure the transmit characteristics of
+ * the ppp interface.
+ */
+
+void ppp_send_config (int unit,int mtu,u_int32_t asyncmap,int pcomp,int accomp)
+{
+ u_int x;
+ struct ifreq ifr;
+
+ SYSDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
+/*
+ * Ensure that the link is still up.
+ */
+ if (!still_ppp())
+ return;
+/*
+ * Set the MTU and other parameters for the ppp device
+ */
+ memset (&ifr, '\0', sizeof (ifr));
+ strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+ ifr.ifr_mtu = mtu;
+
+ if (ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
+ fatal("ioctl(SIOCSIFMTU): %m(%d)", errno);
+
+ SYSDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
+ if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
+ if (!ok_error(errno))
+ fatal("ioctl(PPPIOCSASYNCMAP): %m(%d)", errno);
+ return;
+ }
+
+ x = get_flags();
+ x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
+ x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
+ set_flags(x);
+}
+
+/********************************************************************
+ *
+ * ppp_set_xaccm - set the extended transmit ACCM for the interface.
+ */
+
+void ppp_set_xaccm (int unit, ext_accm accm)
+{
+ SYSDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
+ accm[0], accm[1], accm[2], accm[3]));
+
+ if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) {
+ if ( ! ok_error (errno))
+ warn("ioctl(set extended ACCM): %m(%d)", errno);
+ }
+}
+
+/********************************************************************
+ *
+ * ppp_recv_config - configure the receive-side characteristics of
+ * the ppp interface.
+ */
+
+void ppp_recv_config (int unit,int mru,u_int32_t asyncmap,int pcomp,int accomp)
+{
+ u_int x;
+
+ SYSDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
+/*
+ * If we were called because the link has gone down then there is nothing
+ * which may be done. Just return without incident.
+ */
+ if (!still_ppp())
+ return;
+/*
+ * Set the receiver parameters
+ */
+ if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
+ if ( ! ok_error (errno))
+ error("ioctl(PPPIOCSMRU): %m(%d)", errno);
+ }
+
+ SYSDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
+ if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
+ if (!ok_error(errno))
+ error("ioctl(PPPIOCSRASYNCMAP): %m(%d)", errno);
+ }
+
+ x = get_flags();
+ x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
+ set_flags (x);
+}
+
+/********************************************************************
+ *
+ * ccp_test - ask kernel whether a given compression method
+ * is acceptable for use.
+ */
+
+int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit)
+{
+ struct ppp_option_data data;
+
+ memset (&data, '\0', sizeof (data));
+ data.ptr = opt_ptr;
+ data.length = opt_len;
+ data.transmit = for_transmit;
+
+ if (ioctl(ppp_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
+ return 1;
+
+ return (errno == ENOBUFS)? 0: -1;
+}
+
+/********************************************************************
+ *
+ * ccp_flags_set - inform kernel about the current state of CCP.
+ */
+
+void ccp_flags_set (int unit, int isopen, int isup)
+{
+ if (still_ppp()) {
+ int x = get_flags();
+ x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
+ x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
+ set_flags (x);
+ }
+}
+
+/********************************************************************
+ *
+ * get_idle_time - return how long the link has been idle.
+ */
+int
+get_idle_time(u, ip)
+ int u;
+ struct ppp_idle *ip;
+{
+ return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
+}
+
+/********************************************************************
+ *
+ * get_ppp_stats - return statistics for the link.
+ */
+int
+get_ppp_stats(u, stats)
+ int u;
+ struct pppd_stats *stats;
+{
+ struct ifpppstatsreq req;
+
+ memset (&req, 0, sizeof (req));
+
+ req.stats_ptr = (caddr_t) &req.stats;
+ strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name));
+ if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
+ error("Couldn't get PPP statistics: %m");
+ return 0;
+ }
+ stats->bytes_in = req.stats.p.ppp_ibytes;
+ stats->bytes_out = req.stats.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 (int unit)
+{
+ int x = get_flags();
+
+ return x & SC_DC_FERROR;
+}
+
+/*
+ * path_to_route - determine the path to the proc file system data
+ */
+#define ROUTE_MAX_COLS 12
+FILE *route_fd = (FILE *) 0;
+static char route_buffer [512];
+static int route_dev_col, route_dest_col, route_gw_col;
+static int route_flags_col, route_mask_col;
+static int route_num_cols;
+
+static char *path_to_route (void);
+static int open_route_table (void);
+static void close_route_table (void);
+static int read_route_table (struct rtentry *rt);
+
+/********************************************************************
+ *
+ * path_to_procfs - find the path to the proc file system mount point
+ */
+
+static int path_to_procfs (void)
+{
+ struct mntent *mntent;
+ FILE *fp;
+
+ fp = fopen(MOUNTED, "r");
+ if (fp == NULL) {
+ /* Default the mount location of /proc */
+ strlcpy (route_buffer, "/proc", sizeof (route_buffer));
+ return 1;
+ }
+
+ while ((mntent = getmntent(fp)) != NULL) {
+ if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0)
+ continue;
+ if (strcmp(mntent->mnt_type, "proc") == 0)
+ break;
+ }
+ fclose (fp);
+ if (mntent == 0)
+ return 0;
+
+ strlcpy(route_buffer, mntent->mnt_dir, sizeof (route_buffer));
+ return 1;
+}
+
+/********************************************************************
+ *
+ * path_to_route - find the path to the route tables in the proc file system
+ */
+
+static char *path_to_route (void)
+{
+ if (!path_to_procfs()) {
+ error("proc file system not mounted");
+ return 0;
+ }
+ strlcat (route_buffer, "/net/route", sizeof(route_buffer));
+ return (route_buffer);
+}
+
+/********************************************************************
+ *
+ * close_route_table - close the interface to the route table
+ */
+
+static void close_route_table (void)
+{
+ if (route_fd != (FILE *) 0) {
+ fclose (route_fd);
+ route_fd = (FILE *) 0;
+ }
+}
+
+/********************************************************************
+ *
+ * open_route_table - open the interface to the route table
+ */
+static char route_delims[] = " \t\n";
+
+static int open_route_table (void)
+{
+ char *path;
+
+ close_route_table();
+
+ path = path_to_route();
+ if (path == NULL)
+ return 0;
+
+ route_fd = fopen (path, "r");
+ if (route_fd == NULL) {
+ error("can't open %s: %m (%d)", path, errno);
+ return 0;
+ }
+
+ route_dev_col = 0; /* default to usual columns */
+ route_dest_col = 1;
+ route_gw_col = 2;
+ route_flags_col = 3;
+ route_mask_col = 7;
+ route_num_cols = 8;
+
+ /* parse header line */
+ if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
+ char *p = route_buffer, *q;
+ int col;
+ for (col = 0; col < ROUTE_MAX_COLS; ++col) {
+ int used = 1;
+ if ((q = strtok(p, route_delims)) == 0)
+ break;
+ if (strcasecmp(q, "iface") == 0)
+ route_dev_col = col;
+ else if (strcasecmp(q, "destination") == 0)
+ route_dest_col = col;
+ else if (strcasecmp(q, "gateway") == 0)
+ route_gw_col = col;
+ else if (strcasecmp(q, "flags") == 0)
+ route_flags_col = col;
+ else if (strcasecmp(q, "mask") == 0)
+ route_mask_col = col;
+ else
+ used = 0;
+ if (used && col >= route_num_cols)
+ route_num_cols = col + 1;
+ p = NULL;
+ }
+ }
+
+ return 1;
+}
+
+/********************************************************************
+ *
+ * read_route_table - read the next entry from the route table
+ */
+
+static int read_route_table(struct rtentry *rt)
+{
+ char *cols[ROUTE_MAX_COLS], *p;
+ int col;
+
+ memset (rt, '\0', sizeof (struct rtentry));
+
+ if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
+ return 0;
+
+ p = route_buffer;
+ for (col = 0; col < route_num_cols; ++col) {
+ cols[col] = strtok(p, route_delims);
+ if (cols[col] == NULL)
+ return 0; /* didn't get enough columns */
+ }
+
+ ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr =
+ strtoul(cols[route_dest_col], NULL, 16);
+
+ ((struct sockaddr_in *) &rt->rt_gateway)->sin_addr.s_addr =
+ strtoul(cols[route_gw_col], NULL, 16);
+
+ ((struct sockaddr_in *) &rt->rt_genmask)->sin_addr.s_addr =
+ strtoul(cols[route_mask_col], NULL, 16);
+
+ rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
+ rt->rt_dev = cols[route_dev_col];
+
+ return 1;
+}
+
+/********************************************************************
+ *
+ * defaultroute_exists - determine if there is a default route
+ */
+
+static int defaultroute_exists (struct rtentry *rt)
+{
+ int result = 0;
+
+ if (!open_route_table())
+ return 0;
+
+ while (read_route_table(rt) != 0) {
+ if ((rt->rt_flags & RTF_UP) == 0)
+ continue;
+
+ if (((struct sockaddr_in *) (&rt->rt_dst))->sin_addr.s_addr == 0L) {
+ result = 1;
+ break;
+ }
+ }
+
+ close_route_table();
+ return result;
+}
+
+/*
+ * have_route_to - determine if the system has any route to
+ * a given IP address. `addr' is in network byte order.
+ * Return value is 1 if yes, 0 if no, -1 if don't know.
+ * For demand mode to work properly, we have to ignore routes
+ * through our own interface.
+ */
+int have_route_to(u_int32_t addr)
+{
+ struct rtentry rt;
+ int result = 0;
+
+ if (!open_route_table())
+ return -1; /* don't know */
+
+ while (read_route_table(&rt)) {
+ if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0)
+ continue;
+ if ((addr & ((struct sockaddr_in *)&rt.rt_genmask)->sin_addr.s_addr)
+ == ((struct sockaddr_in *)&rt.rt_dst)->sin_addr.s_addr) {
+ result = 1;
+ break;
+ }
+ }
+
+ close_route_table();
+ return result;
+}
+
+/********************************************************************
+ *
+ * sifdefaultroute - assign a default route through the address given.
+ */
+
+int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
+{
+ struct rtentry rt;
+
+ if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
+ struct in_addr old_gateway =
+ ((struct sockaddr_in *) (&rt.rt_gateway))-> sin_addr;
+
+ if (old_gateway.s_addr != gateway)
+ error("not replacing existing default route to %s [%I]",
+ rt.rt_dev, old_gateway);
+ return 0;
+ }
+
+ memset (&rt, '\0', sizeof (rt));
+ SET_SA_FAMILY (rt.rt_dst, AF_INET);
+ SET_SA_FAMILY (rt.rt_gateway, AF_INET);
+
+ if (kernel_version > KVERSION(2,1,0)) {
+ SET_SA_FAMILY (rt.rt_genmask, AF_INET);
+ ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = 0L;
+ }
+
+ ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
+
+ rt.rt_flags = RTF_UP | RTF_GATEWAY | RTF_DEFAULT;
+ if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
+ if ( ! ok_error ( errno ))
+ error("default route ioctl(SIOCADDRT): %m(%d)", errno);
+ return 0;
+ }
+
+ default_route_gateway = gateway;
+ return 1;
+}
+
+/********************************************************************
+ *
+ * cifdefaultroute - delete a default route through the address given.
+ */
+
+int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
+{
+ struct rtentry rt;
+
+ default_route_gateway = 0;
+
+ memset (&rt, '\0', sizeof (rt));
+ SET_SA_FAMILY (rt.rt_dst, AF_INET);
+ SET_SA_FAMILY (rt.rt_gateway, AF_INET);
+
+ if (kernel_version > KVERSION(2,1,0)) {
+ SET_SA_FAMILY (rt.rt_genmask, AF_INET);
+ ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = 0L;
+ }
+
+ ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
+
+ rt.rt_flags = RTF_UP | RTF_GATEWAY | RTF_DEFAULT;
+ if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
+ if (still_ppp()) {
+ if ( ! ok_error ( errno ))
+ error("default route ioctl(SIOCDELRT): %m (%d)", errno);
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+/********************************************************************
+ *
+ * sifproxyarp - Make a proxy ARP entry for the peer.
+ */
+
+int sifproxyarp (int unit, u_int32_t his_adr)
+{
+ struct arpreq arpreq;
+
+ if (has_proxy_arp == 0) {
+ memset (&arpreq, '\0', sizeof(arpreq));
+
+ SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
+ ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
+ arpreq.arp_flags = ATF_PERM | ATF_PUBL;
+/*
+ * Get the hardware address of an interface on the same subnet
+ * as our local address.
+ */
+ if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev,
+ sizeof(proxy_arp_dev))) {
+ error("Cannot determine ethernet address for proxy ARP");
+ return 0;
+ }
+ strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
+
+ if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) {
+ if ( ! ok_error ( errno ))
+ error("ioctl(SIOCSARP): %m(%d)", errno);
+ return 0;
+ }
+ proxy_arp_addr = his_adr;
+ has_proxy_arp = 1;
+ }
+
+ return 1;
+}
+
+/********************************************************************
+ *
+ * cifproxyarp - Delete the proxy ARP entry for the peer.
+ */
+
+int cifproxyarp (int unit, u_int32_t his_adr)
+{
+ struct arpreq arpreq;
+
+ if (has_proxy_arp) {
+ has_proxy_arp = 0;
+ memset (&arpreq, '\0', sizeof(arpreq));
+ SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
+ ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
+ arpreq.arp_flags = ATF_PERM | ATF_PUBL;
+ strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
+
+ if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) {
+ if ( ! ok_error ( errno ))
+ warn("ioctl(SIOCDARP): %m(%d)", errno);
+ return 0;
+ }
+ }
+ return 1;
+}
+
+/********************************************************************
+ *
+ * get_ether_addr - get the hardware address of an interface on the
+ * the same subnet as ipaddr.
+ */
+
+static int get_ether_addr (u_int32_t ipaddr,
+ struct sockaddr *hwaddr,
+ char *name, int namelen)
+{
+ struct ifreq *ifr, *ifend;
+ u_int32_t ina, mask;
+ struct ifreq ifreq;
+ struct ifconf ifc;
+ struct ifreq ifs[MAX_IFS];
+
+ ifc.ifc_len = sizeof(ifs);
+ ifc.ifc_req = ifs;
+ if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
+ if ( ! ok_error ( errno ))
+ error("ioctl(SIOCGIFCONF): %m(%d)", errno);
+ return 0;
+ }
+
+ SYSDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
+ ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
+/*
+ * Scan through looking for an interface with an Internet
+ * address on the same subnet as `ipaddr'.
+ */
+ ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
+ for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
+ if (ifr->ifr_addr.sa_family == AF_INET) {
+ ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
+ strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
+ SYSDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
+ ifreq.ifr_name));
+/*
+ * Check that the interface is up, and not point-to-point
+ * nor loopback.
+ */
+ if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
+ continue;
+
+ if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
+ continue;
+/*
+ * Get its netmask and check that it's on the right subnet.
+ */
+ if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
+ continue;
+
+ mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
+ SYSDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
+ ip_ntoa(ina), ntohl(mask)));
+
+ if (((ipaddr ^ ina) & mask) != 0)
+ continue;
+ break;
+ }
+ }
+
+ if (ifr >= ifend)
+ return 0;
+
+ strlcpy(name, ifreq.ifr_name, namelen);
+ info("found interface %s for proxy arp", name);
+/*
+ * Now get the hardware address.
+ */
+ memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
+ if (ioctl (sock_fd, SIOCGIFHWADDR, &ifreq) < 0) {
+ error("SIOCGIFHWADDR(%s): %m(%d)", ifreq.ifr_name, errno);
+ return 0;
+ }
+
+ memcpy (hwaddr,
+ &ifreq.ifr_hwaddr,
+ sizeof (struct sockaddr));
+
+ SYSDEBUG ((LOG_DEBUG,
+ "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
+ (int) ((unsigned char *) &hwaddr->sa_data)[0],
+ (int) ((unsigned char *) &hwaddr->sa_data)[1],
+ (int) ((unsigned char *) &hwaddr->sa_data)[2],
+ (int) ((unsigned char *) &hwaddr->sa_data)[3],
+ (int) ((unsigned char *) &hwaddr->sa_data)[4],
+ (int) ((unsigned char *) &hwaddr->sa_data)[5],
+ (int) ((unsigned char *) &hwaddr->sa_data)[6],
+ (int) ((unsigned char *) &hwaddr->sa_data)[7]));
+ return 1;
+}
+
+/********************************************************************
+ *
+ * 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 (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(sock_fd, SIOCGIFCONF, &ifc) < 0) {
+ if ( ! ok_error ( errno ))
+ warn("ioctl(SIOCGIFCONF): %m(%d)", errno);
+ 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) ^ addr) & nmask) != 0)
+ continue;
+/*
+ * Check that the interface is up, and not point-to-point nor loopback.
+ */
+ strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
+ if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
+ continue;
+
+ if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
+ continue;
+/*
+ * Get its netmask and OR it into our mask.
+ */
+ if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
+ continue;
+ mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
+ break;
+ }
+ return mask;
+}
+
+/********************************************************************
+ *
+ * Internal routine to decode the version.modification.patch level
+ */
+
+static void decode_version (char *buf, int *version,
+ int *modification, int *patch)
+{
+ *version = (int) strtoul (buf, &buf, 10);
+ *modification = 0;
+ *patch = 0;
+
+ if (*buf == '.') {
+ ++buf;
+ *modification = (int) strtoul (buf, &buf, 10);
+ if (*buf == '.') {
+ ++buf;
+ *patch = (int) strtoul (buf, &buf, 10);
+ }
+ }
+
+ if (*buf != '\0') {
+ *version =
+ *modification =
+ *patch = 0;
+ }
+}
+
+/********************************************************************
+ *
+ * Procedure to determine if the PPP line discipline is registered.
+ */
+
+static int
+ppp_registered(void)
+{
+ int local_fd;
+ int init_disc = -1;
+ int initfdflags;
+
+ local_fd = open(devnam, O_NONBLOCK | O_RDWR, 0);
+ if (local_fd < 0) {
+ error("Failed to open %s: %m(%d)", devnam, errno);
+ return 0;
+ }
+
+ initfdflags = fcntl(local_fd, F_GETFL);
+ if (initfdflags == -1) {
+ error("Couldn't get device fd flags: %m(%d)", errno);
+ close (local_fd);
+ return 0;
+ }
+
+ initfdflags &= ~O_NONBLOCK;
+ fcntl(local_fd, F_SETFL, initfdflags);
+/*
+ * Read the initial line dicipline and try to put the device into the
+ * PPP dicipline.
+ */
+ if (ioctl(local_fd, TIOCGETD, &init_disc) < 0) {
+ error("ioctl(TIOCGETD): %m(%d)", errno);
+ close (local_fd);
+ return 0;
+ }
+
+ if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) {
+ error("ioctl(TIOCSETD): %m(%d)", errno);
+ close (local_fd);
+ return 0;
+ }
+
+ if (ioctl(local_fd, TIOCSETD, &init_disc) < 0) {
+ error("ioctl(TIOCSETD): %m(%d)", errno);
+ close (local_fd);
+ return 0;
+ }
+
+ close (local_fd);
+ return 1;
+}
+
+/********************************************************************
+ *
+ * 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(void)
+{
+ int s, ok;
+ struct ifreq ifr;
+ int size;
+ int my_version, my_modification, my_patch;
+ extern char *no_ppp_msg;
+/*
+ * Open a socket for doing the ioctl operations.
+ */
+ s = socket(AF_INET, SOCK_DGRAM, 0);
+ if (s < 0)
+ return 0;
+
+ strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
+ ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
+/*
+ * If the device did not exist then attempt to create one by putting the
+ * current tty into the PPP discipline. If this works then obtain the
+ * flags for the device again.
+ */
+ if (!ok) {
+ if (ppp_registered()) {
+ strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
+ ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
+ }
+ }
+/*
+ * Ensure that the hardware address is for PPP and not something else
+ */
+ if (ok)
+ ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
+
+ if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
+ ok = 0;
+
+ if (!ok)
+ no_ppp_msg =
+ "This system lacks kernel support for PPP. This could be because\n"
+ "the PPP kernel module is not loaded, or because the kernel is\n"
+ "not configured for PPP. See the README.linux file in the\n"
+ "ppp-2.3.6 distribution.\n";
+
+/*
+ * This is the PPP device. Validate the version of the driver at this
+ * point to ensure that this program will work with the driver.
+ */
+ else {
+ char abBuffer [1024];
+
+ ifr.ifr_data = abBuffer;
+ size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
+ if (size < 0) {
+ error("Couldn't read driver version: %m");
+ ok = 0;
+ no_ppp_msg = "Sorry, couldn't verify kernel driver version\n";
+
+ } else {
+ decode_version(abBuffer,
+ &driver_version,
+ &driver_modification,
+ &driver_patch);
+/*
+ * Validate the version of the driver against the version that we used.
+ */
+ decode_version(VERSION,
+ &my_version,
+ &my_modification,
+ &my_patch);
+
+ /* The version numbers must match */
+ if (driver_version != my_version)
+ ok = 0;
+
+ /* The modification levels must be legal */
+ if (driver_modification < 3) {
+ if (driver_modification >= 2) {
+ /* we can cope with 2.2.0 and above */
+ driver_is_old = 1;
+ } else {
+ ok = 0;
+ }
+ }
+
+ close (s);
+ if (!ok) {
+ slprintf(route_buffer, sizeof(route_buffer),
+ "Sorry - PPP driver version %d.%d.%d is out of date\n",
+ driver_version, driver_modification, driver_patch);
+
+ no_ppp_msg = route_buffer;
+ }
+ }
+ }
+ return ok;
+}
+
+/********************************************************************
+ *
+ * Update the wtmp file with the appropriate user name and tty device.
+ */
+
+void logwtmp (const char *line, const char *name, const char *host)
+{
+ int wtmp;
+ struct utmp ut, *utp;
+ pid_t mypid = getpid();
+/*
+ * Update the signon database for users.
+ * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
+ */
+ utmpname(_PATH_UTMP);
+ setutent();
+ while ((utp = getutent()) && (utp->ut_pid != mypid))
+ /* nothing */;
+
+ /* Is this call really necessary? There is another one after the 'put' */
+ endutent();
+
+ if (utp)
+ memcpy(&ut, utp, sizeof(ut));
+ else
+ /* some gettys/telnetds don't initialize utmp... */
+ memset(&ut, 0, sizeof(ut));
+
+ if (ut.ut_id[0] == 0)
+ strlcpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
+
+ strlcpy(ut.ut_user, name, sizeof(ut.ut_user));
+ strlcpy(ut.ut_line, line, sizeof(ut.ut_line));
+
+ time(&ut.ut_time);
+
+ ut.ut_type = USER_PROCESS;
+ ut.ut_pid = mypid;
+
+ /* Insert the host name if one is supplied */
+ if (*host)
+ strlcpy (ut.ut_host, host, sizeof(ut.ut_host));
+
+ /* Insert the IP address of the remote system if IP is enabled */
+ if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
+ memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
+ sizeof(ut.ut_addr));
+
+ /* CL: Makes sure that the logout works */
+ if (*host == 0 && *name==0)
+ ut.ut_host[0]=0;
+
+ pututline(&ut);
+ endutent();
+/*
+ * Update the wtmp file.
+ */
+ wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
+ if (wtmp >= 0) {
+ flock(wtmp, LOCK_EX);
+
+ /* we really should check for error on the write for a full disk! */
+ write (wtmp, (char *)&ut, sizeof(ut));
+ close (wtmp);
+
+ flock(wtmp, LOCK_UN);
+ }
+}
+
+/********************************************************************
+ * Code for locking/unlocking the serial device.
+ * This code is derived from chat.c.
+ */
+
+/*
+ * lock - create a lock file for the named device
+ */
+
+int lock (char *dev)
+{
+#ifdef LOCKLIB
+ int result;
+ lock_file = strdup(dev);
+ if (lock_file == NULL)
+ novm("lock file name");
+ result = mklock (dev, (void *) 0);
+
+ if (result > 0) {
+ notice("Device %s is locked by pid %d", dev, result);
+ free (lock_file);
+ lock_file = NULL;
+ result = -1;
+ }
+ else {
+ if (result < 0) {
+ error("Can't create lock file %s", lock_file);
+ free (lock_file);
+ lock_file = NULL;
+ result = -1;
+ }
+ }
+ return (result);
+#else
+ char hdb_lock_buffer[12];
+ int fd, n;
+ int pid = getpid();
+ char *p;
+ size_t l;
+
+ p = strrchr(dev, '/');
+ if (p != NULL)
+ dev = ++p;
+
+ l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
+ lock_file = malloc(l);
+ if (lock_file == NULL)
+ novm("lock file name");
+
+ slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);
+/*
+ * Attempt to create the lock file at this point.
+ */
+ while (1) {
+ fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644);
+ if (fd >= 0) {
+ pid = getpid();
+#ifndef PID_BINARY
+ slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%010d\n", pid);
+ write (fd, hdb_lock_buffer, 11);
+#else
+ write(fd, &pid, sizeof (pid));
+#endif
+ close(fd);
+ return 0;
+ }
+/*
+ * If the file exists then check to see if the pid is stale
+ */
+ if (errno == EEXIST) {
+ fd = open(lock_file, O_RDONLY, 0);
+ if (fd < 0) {
+ if (errno == ENOENT) /* This is just a timing problem. */
+ continue;
+ break;
+ }
+
+ /* Read the lock file to find out who has the device locked */
+ n = read (fd, hdb_lock_buffer, 11);
+ close (fd);
+ if (n < 0) {
+ error("Can't read pid from lock file %s", lock_file);
+ break;
+ }
+
+ /* See the process still exists. */
+ if (n > 0) {
+#ifndef PID_BINARY
+ hdb_lock_buffer[n] = '\0';
+ sscanf (hdb_lock_buffer, " %d", &pid);
+#else
+ pid = ((int *) hdb_lock_buffer)[0];
+#endif
+ if (pid == 0 || pid == getpid()
+ || (kill(pid, 0) == -1 && errno == ESRCH))
+ n = 0;
+ }
+
+ /* If the process does not exist then try to remove the lock */
+ if (n == 0 && unlink (lock_file) == 0) {
+ notice("Removed stale lock on %s (pid %d)",
+ dev, pid);
+ continue;
+ }
+
+ notice("Device %s is locked by pid %d", dev, pid);
+ break;
+ }
+
+ error("Can't create lock file %s: %m(%d)", lock_file, errno);
+ break;
+ }
+
+ free(lock_file);
+ lock_file = NULL;
+ return -1;
+#endif
+}
+
+
+/********************************************************************
+ *
+ * unlock - remove our lockfile
+ */
+
+void unlock(void)
+{
+ if (lock_file) {
+#ifdef LOCKLIB
+ (void) rmlock (lock_file, (void *) 0);
+#else
+ unlink(lock_file);
+#endif
+ free(lock_file);
+ lock_file = NULL;
+ }
+}
+
+/********************************************************************
+ *
+ * sifvjcomp - config tcp header compression
+ */
+
+int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
+{
+ u_int x = get_flags();
+
+ if (vjcomp) {
+ if (ioctl (ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(PPPIOCSMAXCID): %m(%d)", errno);
+ vjcomp = 0;
+ }
+ }
+
+ x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
+ x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
+ set_flags (x);
+
+ return 1;
+}
+
+/********************************************************************
+ *
* sifup - Config the interface up and enable IP packets to pass.
*/
{
struct ifreq ifr;
- strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
- if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
- syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
+ memset (&ifr, '\0', sizeof (ifr));
+ strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+ if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ error("ioctl (SIOCGIFFLAGS): %m(%d)", errno);
return 0;
}
ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
- if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
- syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
+ if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(SIOCSIFFLAGS): %m(%d)", errno);
return 0;
}
+ if_is_up = 1;
return 1;
}
-/*
+/********************************************************************
+ *
* sifdown - Config the interface down and disable IP.
*/
{
struct ifreq ifr;
- strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
- if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
- syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
+ if_is_up = 0;
+
+ memset (&ifr, '\0', sizeof (ifr));
+ strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+ if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ error("ioctl (SIOCGIFFLAGS): %m(%d)", errno);
return 0;
}
ifr.ifr_flags &= ~IFF_UP;
ifr.ifr_flags |= IFF_POINTOPOINT;
- if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
- syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
+ if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(SIOCSIFFLAGS): %m(%d)", errno);
return 0;
}
return 1;
}
-/*
+/********************************************************************
+ *
* sifaddr - Config the interface IP addresses and netmask.
*/
-int sifaddr (int unit, int our_adr, int his_adr, int net_mask)
+int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
+ u_int32_t net_mask)
{
struct ifreq ifr;
struct rtentry rt;
+ memset (&ifr, '\0', sizeof (ifr));
+ memset (&rt, '\0', sizeof (rt));
+
SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
- strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
+ strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
/*
* Set our IP address
*/
((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = our_adr;
- if (ioctl(s, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
- if (errno != EEXIST)
- syslog (LOG_ERR, "ioctl(SIOCAIFADDR): %m");
- else
- syslog (LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
+ if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
+ if (errno != EEXIST) {
+ if (! ok_error (errno))
+ error("ioctl(SIOCAIFADDR): %m(%d)", errno);
+ }
+ else {
+ warn("ioctl(SIOCAIFADDR): Address already exists");
+ }
return (0);
- }
+ }
/*
* Set the gateway address
*/
((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = his_adr;
- if (ioctl(s, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
- syslog (LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m");
+ if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(SIOCSIFDSTADDR): %m(%d)", errno);
return (0);
}
/*
- * Set the netmask
+ * Set the netmask.
+ * For recent kernels, force the netmask to 255.255.255.255.
*/
+ if (kernel_version >= KVERSION(2,1,16))
+ net_mask = ~0L;
if (net_mask != 0) {
((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = net_mask;
- if (ioctl(s, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
- syslog (LOG_ERR, "ioctl(SIOCSIFNETMASK): %m");
+ if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(SIOCSIFNETMASK): %m(%d)", errno);
return (0);
- }
+ }
}
/*
* Add the device route
*/
- memset (&rt, '\0', sizeof (rt));
-
- SET_SA_FAMILY (rt.rt_dst, AF_INET);
- SET_SA_FAMILY (rt.rt_gateway, AF_INET);
- rt.rt_dev = ifname; /* MJC */
-
- ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
- ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
- rt.rt_flags = RTF_UP | RTF_HOST;
+ if (kernel_version < KVERSION(2,1,16)) {
+ SET_SA_FAMILY (rt.rt_dst, AF_INET);
+ SET_SA_FAMILY (rt.rt_gateway, AF_INET);
+ rt.rt_dev = ifname;
+
+ ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0L;
+ ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
+ rt.rt_flags = RTF_UP | RTF_HOST;
+
+ if (kernel_version > KVERSION(2,1,0)) {
+ SET_SA_FAMILY (rt.rt_genmask, AF_INET);
+ ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = -1L;
+ }
- if (ioctl(s, SIOCADDRT, &rt) < 0) {
- syslog (LOG_ERR, "ioctl(SIOCADDRT) device route: %m");
- return (0);
+ if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
+ if (! ok_error (errno))
+ error("ioctl(SIOCADDRT) device route: %m(%d)", errno);
+ return (0);
+ }
}
return 1;
}
-/*
+/********************************************************************
+ *
* cifaddr - Clear the interface IP addresses, and delete routes
* through the interface if possible.
*/
-int cifaddr (int unit, int our_adr, int his_adr)
+int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
{
struct rtentry rt;
-/*
- * Delete the route through the device
- */
- memset (&rt, '\0', sizeof (rt));
-
- SET_SA_FAMILY (rt.rt_dst, AF_INET);
- SET_SA_FAMILY (rt.rt_gateway, AF_INET);
- rt.rt_dev = ifname; /* MJC */
-
- ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
- ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
- rt.rt_flags = RTF_UP | RTF_HOST;
-
- if (ioctl(s, SIOCDELRT, &rt) < 0) {
- syslog (LOG_ERR, "ioctl(SIOCDELRT) device route: %m");
- return (0);
- }
- return 1;
-}
-
-/*
- * path_to_route - determine the path to the proc file system data
- */
-
-FILE *route_fd = (FILE *) 0;
-static char route_buffer [100];
-
-static char *path_to_route (void);
-static int open_route_table (void);
-static void close_route_table (void);
-static int read_route_table (struct rtentry *rt);
-static int defaultroute_exists (void);
+ if (kernel_version < KVERSION(2,1,16)) {
/*
- * path_to_route - find the path to the route tables in the proc file system
+ * Delete the route through the device
*/
+ memset (&rt, '\0', sizeof (rt));
-static char *path_to_route (void)
-{
- struct mntent *mntent;
- FILE *fp;
+ SET_SA_FAMILY (rt.rt_dst, AF_INET);
+ SET_SA_FAMILY (rt.rt_gateway, AF_INET);
+ rt.rt_dev = ifname;
- fp = fopen (MOUNTED, "r");
- if (fp != 0) {
- while ((mntent = getmntent (fp)) != 0) {
- if (strcmp (mntent->mnt_type, MNTTYPE_IGNORE) == 0)
- continue;
+ ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
+ ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
+ rt.rt_flags = RTF_UP | RTF_HOST;
- if (strcmp (mntent->mnt_type, "proc") == 0) {
- strncpy (route_buffer, mntent->mnt_dir,
- sizeof (route_buffer)-10);
- route_buffer [sizeof (route_buffer)-10] = '\0';
- strcat (route_buffer, "/net/route");
+ if (kernel_version > KVERSION(2,1,0)) {
+ SET_SA_FAMILY (rt.rt_genmask, AF_INET);
+ ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = -1L;
+ }
- fclose (fp);
- return (route_buffer);
- }
+ if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
+ if (still_ppp() && ! ok_error (errno))
+ error("ioctl(SIOCDELRT) device route: %m(%d)", errno);
+ return (0);
}
- fclose (fp);
}
- syslog (LOG_ERR, "proc file system not mounted");
- return 0;
+ return 1;
}
/*
- * open_route_table - open the interface to the route table
+ * get_pty - get a pty master/slave pair and chown the slave side
+ * to the uid given. Assumes slave_name points to >= 12 bytes of space.
*/
-
-static int open_route_table (void)
+int
+get_pty(master_fdp, slave_fdp, slave_name, uid)
+ int *master_fdp;
+ int *slave_fdp;
+ char *slave_name;
+ int uid;
{
- char *path;
-
- if (route_fd != (FILE *) 0)
- close_route_table();
-
- path = path_to_route();
- if (path == NULL)
- return 0;
-
- route_fd = fopen (path, "r");
- if (route_fd == (FILE *) 0) {
- syslog (LOG_ERR, "can not open %s: %m", path);
- return 0;
+ int i, mfd, sfd;
+ char pty_name[12];
+ struct termios tios;
+
+ sfd = -1;
+ for (i = 0; i < 64; ++i) {
+ slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
+ 'p' + i / 16, i % 16);
+ mfd = open(pty_name, O_RDWR, 0);
+ if (mfd >= 0) {
+ pty_name[5] = 't';
+ sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
+ if (sfd >= 0)
+ break;
+ close(mfd);
+ }
}
-
- /* read and discard the header line. */
- if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0) {
- close_route_table();
+ if (sfd < 0)
return 0;
- }
- return 1;
-}
-/*
- * close_route_table - close the interface to the route table
- */
+ strlcpy(slave_name, pty_name, 12);
+ *master_fdp = mfd;
+ *slave_fdp = sfd;
+ fchown(sfd, uid, -1);
+ fchmod(sfd, S_IRUSR | S_IWUSR);
+ if (tcgetattr(sfd, &tios) == 0) {
+ tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
+ tios.c_cflag |= CS8 | CREAD;
+ tios.c_iflag = IGNPAR | CLOCAL;
+ tios.c_oflag = 0;
+ tios.c_lflag = 0;
+ if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0)
+ warn("couldn't set attributes on pty: %m");
+ } else
+ warn("couldn't get attributes on pty: %m");
-static void close_route_table (void)
-{
- if (route_fd != (FILE *) 0) {
- fclose (route_fd);
- route_fd = (FILE *) 0;
- }
+ return 1;
}
-/*
- * read_route_table - read the next entry from the route table
+/********************************************************************
+ *
+ * open_loopback - open the device we use for getting packets
+ * in demand mode. Under Linux, we use a pty master/slave pair.
*/
-
-static int read_route_table (struct rtentry *rt)
+int
+open_ppp_loopback(void)
{
- static char delims[] = " \t\n";
- char *dev_ptr, *ptr, *dst_ptr, *gw_ptr, *flag_ptr;
-
- if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
- return 0;
-
- memset (rt, '\0', sizeof (struct rtentry));
+ int flags;
- dev_ptr = strtok (route_buffer, delims); /* interface name */
- dst_ptr = strtok (NULL, delims); /* destination address */
- gw_ptr = strtok (NULL, delims); /* gateway */
- flag_ptr = strtok (NULL, delims); /* flags */
-#if 0
- ptr = strtok (NULL, delims); /* reference count */
- ptr = strtok (NULL, delims); /* useage count */
- ptr = strtok (NULL, delims); /* metric */
- ptr = strtok (NULL, delims); /* mask */
-#endif
-
- ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr =
- strtoul (dst_ptr, NULL, 16);
+ if (!get_pty(&master_fd, &slave_fd, loop_name, 0))
+ fatal("No free pty for loopback");
+ SYSDEBUG(("using %s for loopback", loop_name));
- ((struct sockaddr_in *) &rt->rt_gateway)->sin_addr.s_addr =
- strtoul (gw_ptr, NULL, 16);
+ set_ppp_fd(slave_fd);
- rt->rt_flags = (short) strtoul (flag_ptr, NULL, 16);
- rt->rt_dev = dev_ptr;
+ flags = fcntl(master_fd, F_GETFL);
+ if (flags == -1 ||
+ fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
+ warn("couldn't set master loopback to nonblock: %m(%d)", errno);
- return 1;
-}
+ flags = fcntl(ppp_fd, F_GETFL);
+ if (flags == -1 ||
+ fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
+ warn("couldn't set slave loopback to nonblock: %m(%d)", errno);
+ if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
+ fatal("ioctl(TIOCSETD): %m(%d)", errno);
/*
- * defaultroute_exists - determine if there is a default route
+ * Find out which interface we were given.
*/
+ if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
+ fatal("ioctl(PPPIOCGUNIT): %m(%d)", errno);
+/*
+ * Enable debug in the driver if requested.
+ */
+ set_kdebugflag (kdebugflag);
-static int defaultroute_exists (void)
-{
- struct rtentry rt;
- int result = 0;
-
- if (!open_route_table())
- return 0;
-
- while (read_route_table(&rt) != 0) {
- if (rt.rt_flags & RTF_UP == 0)
- continue;
-
- if (((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr == 0L) {
- syslog (LOG_ERR,
- "ppp not replacing existing default route to %s[%s]",
- rt.rt_dev,
- inet_ntoa (((struct sockaddr_in *) &rt.rt_gateway)->
- sin_addr.s_addr));
- result = 1;
- break;
- }
- }
- close_route_table();
- return result;
+ return master_fd;
}
-/*
- * sifdefaultroute - assign a default route through the address given.
+/********************************************************************
+ *
+ * restore_loop - reattach the ppp unit to the loopback.
+ *
+ * The kernel ppp driver automatically reattaches the ppp unit to
+ * the loopback if the serial port is set to a line discipline other
+ * than ppp, or if it detects a modem hangup. The former will happen
+ * in disestablish_ppp if the latter hasn't already happened, so we
+ * shouldn't need to do anything.
+ *
+ * Just to be sure, set the real serial port to the normal discipline.
*/
-int sifdefaultroute (int unit, int gateway)
+void
+restore_loop(void)
{
- struct rtentry rt;
-
- if (defaultroute_exists())
- return 0;
-
- memset (&rt, '\0', 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 = gateway;
-
- rt.rt_flags = RTF_UP | RTF_GATEWAY;
- if (ioctl(s, SIOCADDRT, &rt) < 0) {
- syslog (LOG_ERR, "default route ioctl(SIOCADDRT): %m");
- return 0;
+ if (ppp_fd != slave_fd) {
+ (void) ioctl(ppp_fd, TIOCSETD, &tty_disc);
+ set_ppp_fd(slave_fd);
}
- return 1;
}
-/*
- * cifdefaultroute - delete a default route through the address given.
+/********************************************************************
+ *
+ * sifnpmode - Set the mode for handling packets for a given NP.
*/
-int cifdefaultroute (int unit, int gateway)
+int
+sifnpmode(u, proto, mode)
+ int u;
+ int proto;
+ enum NPmode mode;
{
- struct rtentry 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 = gateway;
-
- rt.rt_flags = RTF_UP | RTF_GATEWAY;
- if (ioctl(s, SIOCDELRT, &rt) < 0) {
- syslog (LOG_ERR, "default route ioctl(SIOCDELRT): %m");
+ struct npioctl npi;
+
+ npi.protocol = proto;
+ npi.mode = mode;
+ if (ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
+ if (! ok_error (errno)) {
+ error("ioctl(PPPIOCSNPMODE, %d, %d): %m (%d)",
+ proto, mode, errno);
+ error("ppp_fd=%d slave_fd=%d\n", ppp_fd, slave_fd);
+ }
return 0;
}
return 1;
}
-/*
- * sifproxyarp - Make a proxy ARP entry for the peer.
+\f
+/********************************************************************
+ *
+ * sipxfaddr - Config the interface IPX networknumber
*/
-int sifproxyarp (int unit, u_long his_adr)
+int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
{
- struct arpreq arpreq;
-
- memset (&arpreq, '\0', sizeof(arpreq));
+ int result = 1;
+
+#ifdef IPX_CHANGE
+ int skfd;
+ struct ifreq ifr;
+ struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
+
+ skfd = socket (AF_IPX, SOCK_DGRAM, 0);
+ if (skfd < 0) {
+ if (! ok_error (errno))
+ dbglog("socket(AF_IPX): %m (%d)", errno);
+ result = 0;
+ }
+ else {
+ memset (&ifr, '\0', sizeof (ifr));
+ strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+
+ memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
+ sipx->sipx_family = AF_IPX;
+ sipx->sipx_port = 0;
+ sipx->sipx_network = htonl (network);
+ sipx->sipx_type = IPX_FRAME_ETHERII;
+ sipx->sipx_action = IPX_CRTITF;
/*
- * Get the hardware address of an interface on the same subnet
- * as our local address.
+ * Set the IPX device
*/
- if (!get_ether_addr(his_adr, &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 = his_adr;
- arpreq.arp_flags = ATF_PERM | ATF_PUBL;
-
- if (ioctl(s, SIOCSARP, (caddr_t)&arpreq) < 0) {
- syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
- return 0;
+ if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
+ result = 0;
+ if (errno != EEXIST) {
+ if (! ok_error (errno))
+ dbglog("ioctl(SIOCAIFADDR, CRTITF): %m (%d)", errno);
+ }
+ else {
+ warn("ioctl(SIOCAIFADDR, CRTITF): Address already exists");
+ }
+ }
+ close (skfd);
}
- return 1;
+#endif
+ return result;
}
-/*
- * cifproxyarp - Delete the proxy ARP entry for the peer.
+/********************************************************************
+ *
+ * cipxfaddr - Clear the information for the IPX network. The IPX routes
+ * are removed and the device is no longer able to pass IPX
+ * frames.
*/
-int cifproxyarp (int unit, u_long his_adr)
+int cipxfaddr (int unit)
{
- struct arpreq arpreq;
-
- memset (&arpreq, '\0', sizeof(arpreq));
- SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
-
- ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
- if (ioctl(s, SIOCDARP, (caddr_t)&arpreq) < 0) {
- syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
- return 0;
+ int result = 1;
+
+#ifdef IPX_CHANGE
+ int skfd;
+ struct ifreq ifr;
+ struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
+
+ skfd = socket (AF_IPX, SOCK_DGRAM, 0);
+ if (skfd < 0) {
+ if (! ok_error (errno))
+ dbglog("socket(AF_IPX): %m (%d)", errno);
+ result = 0;
}
- return 1;
-}
-
-/*
- * get_ether_addr - get the hardware address of an interface on the
- * the same subnet as ipaddr.
- */
+ else {
+ memset (&ifr, '\0', sizeof (ifr));
+ strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
-int get_ether_addr (u_long ipaddr, struct sockaddr *hwaddr)
-{
- struct ifreq *ifr, *ifend, *ifp;
- int i;
- u_long ina, mask;
- struct sockaddr_dl *dla;
- struct ifreq ifreq;
- struct ifconf ifc;
- struct ifreq ifs[MAX_IFS];
-
- ifc.ifc_len = sizeof(ifs);
- ifc.ifc_req = ifs;
- if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
- syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
- return 0;
- }
- MAINDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
- ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
+ sipx->sipx_type = IPX_FRAME_ETHERII;
+ sipx->sipx_action = IPX_DLTITF;
+ sipx->sipx_family = AF_IPX;
/*
- * Scan through looking for an interface with an Internet
- * address on the same subnet as `ipaddr'.
- */
- ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
- for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
- 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));
- MAINDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
- ifreq.ifr_name));
-/*
- * Check that the interface is up, and not point-to-point
- * or loopback.
- */
- if (ioctl(s, 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.
+ * Set the IPX device
*/
- if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0)
- continue;
- mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
- MAINDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
- ip_ntoa(ina), ntohl(mask)));
- if (((ipaddr ^ ina) & mask) != 0)
- continue;
- break;
+ if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
+ if (! ok_error (errno))
+ info("ioctl(SIOCAIFADDR, IPX_DLTITF): %m (%d)", errno);
+ result = 0;
}
+ close (skfd);
}
-
- if (ifr >= ifend)
- return 0;
+#endif
+ return result;
+}
- syslog(LOG_INFO, "found interface %s for proxy arp", ifreq.ifr_name);
/*
- * Now get the hardware address.
+ * daemon - Detach us from controlling terminal session.
*/
- if (ioctl (s, SIOCGIFHWADDR, &ifreq) < 0) {
- syslog(LOG_ERR, "SIOCGIFHWADDR(%s): %m", ifreq.ifr_name);
- return 0;
+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);
}
-
- hwaddr->sa_family = ARPHRD_ETHER;
- memcpy (&hwaddr->sa_data, &ifr->ifr_hwaddr, ETH_ALEN);
-
- MAINDEBUG ((LOG_DEBUG,
- "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x",
- (int) ((unsigned char *) &ifr->ifr_hwaddr)[0],
- (int) ((unsigned char *) &ifr->ifr_hwaddr)[1],
- (int) ((unsigned char *) &ifr->ifr_hwaddr)[2],
- (int) ((unsigned char *) &ifr->ifr_hwaddr)[3],
- (int) ((unsigned char *) &ifr->ifr_hwaddr)[4],
- (int) ((unsigned char *) &ifr->ifr_hwaddr)[5]));
- return 1;
+ return 0;
}
/*
- * ppp_available - check whether the system has any ppp interfaces
- * (in fact we check whether we can do an ioctl on ppp0).
+ * Use the hostname as part of the random number seed.
*/
-
-int ppp_available(void)
+int
+get_host_seed()
{
- int s, ok;
- struct ifreq ifr;
-
- s = socket(AF_INET, SOCK_DGRAM, 0);
- if (s < 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;
+ int h;
+ char *p = hostname;
+
+ h = 407;
+ for (p = hostname; *p != 0; ++p)
+ h = h * 37 + *p;
+ return h;
}
+/********************************************************************
+ *
+ * sys_check_options - check the options that the user specified
+ */
+
int
-logwtmp(line, name, host)
- char *line, *name, *host;
+sys_check_options(void)
{
- struct utmp ut;
-
- memset (&ut, 0, sizeof (ut));
- (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);
-
- pututline (&ut); /* Write the line to the proper place */
- endutent(); /* Indicate operation is complete */
+#ifdef IPX_CHANGE
+ struct stat stat_buf;
+/*
+ * Disable the IPX protocol if the support is not present in the kernel.
+ * If we disable it then ensure that IP support is enabled.
+ */
+ while (ipxcp_protent.enabled_flag) {
+ if (path_to_procfs()) {
+ strlcat (route_buffer, "/net/ipx_interface", sizeof(route_buffer));
+ if (lstat (route_buffer, &stat_buf) >= 0)
+ break;
+ }
+ error("IPX support is not present in the kernel\n");
+ ipxcp_protent.enabled_flag = 0;
+ ipcp_protent.enabled_flag = 1;
+ break;
+ }
+#endif
+ if (demand && driver_is_old) {
+ option_error("demand dialling is not supported by kernel driver "
+ "version %d.%d.%d", driver_version, driver_modification,
+ driver_patch);
+ return 0;
+ }
+ return 1;
}