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freebsd-skq/usr.sbin/pppd/sys-bsd.c
Brooks Davis 51480d2fff Test for the existance of kernel ppp support by seeing if the kernel has 
the module compiled in or loaded instead of bogusly checking for ppp0.
Also if and only if the caller is actually root and the kernel does not
have ppp support, try to load the ppp module before giving up.
2002-11-05 05:58:31 +00:00

1595 lines
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/*
* sys-bsd.c - System-dependent procedures for setting up
* PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.)
*
* Copyright (c) 1989 Carnegie Mellon University.
* Copyright (c) 1995 The Australian National University.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by Carnegie Mellon University and The Australian National University.
* The names of the Universities may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char rcsid[] = "$FreeBSD$";
#endif
/* $NetBSD: sys-bsd.c,v 1.1.1.3 1997/09/26 18:53:04 christos Exp $ */
/*
* TODO:
*/
#include <stdio.h>
#include <syslog.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <termios.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/module.h>
#ifdef NetBSD1_2
#include <util.h>
#endif
#ifdef PPP_FILTER
#include <net/bpf.h>
#endif
#include <net/if.h>
#include <net/ppp_defs.h>
#include <net/if_ppp.h>
#include <net/route.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#ifdef IPX_CHANGE
#include <netipx/ipx.h>
#endif
#if RTM_VERSION >= 3
#include <sys/param.h>
#if defined(NetBSD) && (NetBSD >= 199703)
#include <netinet/if_inarp.h>
#else /* NetBSD 1.2D or later */
#ifdef __FreeBSD__
#include <netinet/if_ether.h>
#else
#include <net/if_ether.h>
#endif
#endif
#endif
#include "pppd.h"
#include "fsm.h"
#include "ipcp.h"
static int initdisc = -1; /* Initial TTY discipline for ppp_fd */
static int initfdflags = -1; /* Initial file descriptor flags for ppp_fd */
static int ppp_fd = -1; /* fd which is set to PPP 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 */
static int loop_slave = -1;
static int loop_master;
static char loop_name[20];
static unsigned char inbuf[512]; /* buffer for chars read from loopback */
static int sockfd; /* socket for doing interface ioctls */
static int if_is_up; /* the interface is currently up */
static u_int32_t ifaddrs[2]; /* local and remote addresses we set */
static u_int32_t default_route_gateway; /* gateway addr for default route */
static u_int32_t proxy_arp_addr; /* remote addr for proxy arp */
/* Prototypes for procedures local to this file. */
static int dodefaultroute __P((u_int32_t, int));
static int get_ether_addr __P((u_int32_t, struct sockaddr_dl *));
/*
* sys_init - System-dependent initialization.
*/
void
sys_init()
{
/* Get an internet socket for doing socket ioctl's on. */
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
syslog(LOG_ERR, "Couldn't create IP socket: %m");
die(1);
}
}
/*
* sys_cleanup - restore any system state we modified before exiting:
* mark the interface down, delete default route and/or proxy arp entry.
* This should call die() because it's called from die().
*/
void
sys_cleanup()
{
struct ifreq ifr;
if (if_is_up) {
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0
&& ((ifr.ifr_flags & IFF_UP) != 0)) {
ifr.ifr_flags &= ~IFF_UP;
ioctl(sockfd, SIOCSIFFLAGS, &ifr);
}
}
if (ifaddrs[0] != 0)
cifaddr(0, ifaddrs[0], ifaddrs[1]);
if (default_route_gateway)
cifdefaultroute(0, 0, default_route_gateway);
if (proxy_arp_addr)
cifproxyarp(0, proxy_arp_addr);
}
/*
* sys_close - Clean up in a child process before execing.
*/
void
sys_close()
{
close(sockfd);
if (loop_slave >= 0) {
close(loop_slave);
close(loop_master);
}
}
/*
* sys_check_options - check the options that the user specified
*/
void
sys_check_options()
{
}
/*
* ppp_available - check whether the system has the ppp module loaded
* or compiled in. If it doesn't, and we're actually root (not just SUID
* root) try loading it before giving up.
*/
int
ppp_available()
{
const char *modname = "if_ppp";
extern char *no_ppp_msg;
if (modfind(modname) != -1) {
return 1;
}
if (getuid() == 0 && kldload(modname) != -1)
return 1;
no_ppp_msg = "\
This system lacks kernel support for PPP. To include PPP support\n\
in the kernel, please add \"device ppp\" to your kernel config or \n\
load the if_ppp module.\n";
return 0;
}
/*
* establish_ppp - Turn the serial port into a ppp interface.
*/
void
establish_ppp(fd)
int fd;
{
int pppdisc = PPPDISC;
int x;
if (demand) {
/*
* Demand mode - prime the old ppp device to relinquish the unit.
*/
if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0) {
syslog(LOG_ERR, "ioctl(transfer ppp unit): %m");
die(1);
}
}
/*
* Save the old line discipline of fd, and set it to PPP.
*/
if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
die(1);
}
if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
die(1);
}
if (!demand) {
/*
* Find out which interface we were given.
*/
if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
die(1);
}
} else {
/*
* Check that we got the same unit again.
*/
if (ioctl(fd, PPPIOCGUNIT, &x) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
die(1);
}
if (x != ifunit) {
syslog(LOG_ERR, "transfer_ppp failed: wanted unit %d, got %d",
ifunit, x);
die(1);
}
x = TTYDISC;
ioctl(loop_slave, TIOCSETD, &x);
}
ppp_fd = fd;
/*
* Enable debug in the driver if requested.
*/
if (kdebugflag) {
if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
} else {
x |= (kdebugflag & 0xFF) * SC_DEBUG;
if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
}
}
/*
* Set device for non-blocking reads.
*/
if ((initfdflags = fcntl(fd, F_GETFL)) == -1
|| fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
syslog(LOG_WARNING, "Couldn't set device to non-blocking mode: %m");
}
}
/*
* restore_loop - reattach the ppp unit to the loopback.
*/
void
restore_loop()
{
int x;
/*
* Transfer the ppp interface back to the loopback.
*/
if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0) {
syslog(LOG_ERR, "ioctl(transfer ppp unit): %m");
die(1);
}
x = PPPDISC;
if (ioctl(loop_slave, TIOCSETD, &x) < 0) {
syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
die(1);
}
/*
* Check that we got the same unit again.
*/
if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
die(1);
}
if (x != ifunit) {
syslog(LOG_ERR, "transfer_ppp failed: wanted unit %d, got %d",
ifunit, x);
die(1);
}
ppp_fd = loop_slave;
}
/*
* disestablish_ppp - Restore the serial port to normal operation.
* This shouldn't call die() because it's called from die().
*/
void
disestablish_ppp(fd)
int fd;
{
/* Reset non-blocking mode on fd. */
if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
syslog(LOG_WARNING, "Couldn't restore device fd flags: %m");
initfdflags = -1;
/* Restore old line discipline. */
if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0)
syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
initdisc = -1;
if (fd == ppp_fd)
ppp_fd = -1;
}
/*
* Check whether the link seems not to be 8-bit clean.
*/
void
clean_check()
{
int x;
char *s;
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";
break;
case SC_RCV_B7_1:
s = "bit 7 set to 0";
break;
case SC_RCV_EVNP:
s = "odd parity";
break;
case SC_RCV_ODDP:
s = "even parity";
break;
}
if (s != NULL) {
syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
syslog(LOG_WARNING, "All received characters had %s", s);
}
}
}
/*
* 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.
*/
void
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 && !local)
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 |= IXON | 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(fd)
int fd;
{
if (restore_term) {
if (!default_device) {
/*
* Turn off echoing, because otherwise we can get into
* a loop with the tty and the modem echoing to each other.
* We presume we are the sole user of this tty device, so
* when we close it, it will revert to its defaults anyway.
*/
inittermios.c_lflag &= ~(ECHO | ECHONL);
}
if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
if (errno != ENXIO)
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().
*/
void
setdtr(fd, on)
int fd, on;
{
int modembits = TIOCM_DTR;
ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
}
/*
* open_ppp_loopback - open the device we use for getting
* packets in demand mode, and connect it to a ppp interface.
* Here we use a pty.
*/
void
open_ppp_loopback()
{
int flags;
struct termios tios;
int pppdisc = PPPDISC;
if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0) {
syslog(LOG_ERR, "No free pty for loopback");
die(1);
}
SYSDEBUG((LOG_DEBUG, "using %s for loopback", loop_name));
if (tcgetattr(loop_slave, &tios) == 0) {
tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
tios.c_cflag |= CS8 | CREAD;
tios.c_iflag = IGNPAR;
tios.c_oflag = 0;
tios.c_lflag = 0;
if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
syslog(LOG_WARNING, "couldn't set attributes on loopback: %m");
}
if ((flags = fcntl(loop_master, F_GETFL)) != -1)
if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
syslog(LOG_WARNING, "couldn't set loopback to nonblock: %m");
ppp_fd = loop_slave;
if (ioctl(ppp_fd, TIOCSETD, &pppdisc) < 0) {
syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
die(1);
}
/*
* Find out which interface we were given.
*/
if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
die(1);
}
/*
* Enable debug in the driver if requested.
*/
if (kdebugflag) {
if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
} else {
flags |= (kdebugflag & 0xFF) * SC_DEBUG;
if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
}
}
}
/*
* output - Output PPP packet.
*/
void
output(unit, p, len)
int unit;
u_char *p;
int len;
{
if (debug)
log_packet(p, len, "sent ", LOG_DEBUG);
if (write(ttyfd, p, len) < 0) {
if (errno != EIO)
syslog(LOG_ERR, "write: %m");
}
}
/*
* wait_input - wait until there is data available on ttyfd,
* for the length of time specified by *timo (indefinite
* if timo is NULL).
*/
void
wait_input(timo)
struct timeval *timo;
{
fd_set ready;
int n;
if (ttyfd >= FD_SETSIZE) {
syslog(LOG_ERR, "descriptor too big");
die(1);
}
FD_ZERO(&ready);
FD_SET(ttyfd, &ready);
n = select(ttyfd+1, &ready, NULL, &ready, timo);
if (n < 0 && errno != EINTR) {
syslog(LOG_ERR, "select: %m");
die(1);
}
}
/*
* 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;
if (loop_master >= FD_SETSIZE) {
syslog(LOG_ERR, "descriptor too big");
die(1);
}
FD_ZERO(&ready);
FD_SET(loop_master, &ready);
n = select(loop_master + 1, &ready, NULL, &ready, timo);
if (n < 0 && errno != EINTR) {
syslog(LOG_ERR, "select: %m");
die(1);
}
}
/*
* 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) {
syslog(LOG_ERR, "select: %m");
die(1);
}
}
/*
* read_packet - get a PPP packet from the serial device.
*/
int
read_packet(buf)
u_char *buf;
{
int len;
if ((len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
if (errno == EWOULDBLOCK || errno == EINTR)
return -1;
syslog(LOG_ERR, "read: %m");
die(1);
}
return len;
}
/*
* get_loop_output - read characters from the loopback, form them
* into frames, and detect when we want to bring the real link up.
* Return value is 1 if we need to bring up the link, 0 otherwise.
*/
int
get_loop_output()
{
int rv = 0;
int n;
while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
if (loop_chars(inbuf, n))
rv = 1;
}
if (n == 0) {
syslog(LOG_ERR, "eof on loopback");
die(1);
} else if (errno != EWOULDBLOCK){
syslog(LOG_ERR, "read from loopback: %m");
die(1);
}
return rv;
}
/*
* ppp_send_config - configure the transmit characteristics of
* the ppp interface.
*/
void
ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
int unit, mtu;
u_int32_t asyncmap;
int pcomp, accomp;
{
u_int x;
struct ifreq ifr;
strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
ifr.ifr_mtu = mtu;
if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
quit();
}
if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
quit();
}
if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
quit();
}
x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
quit();
}
}
/*
* ppp_set_xaccm - set the extended transmit ACCM for the interface.
*/
void
ppp_set_xaccm(unit, accm)
int unit;
ext_accm accm;
{
if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
}
/*
* ppp_recv_config - configure the receive-side characteristics of
* the ppp interface.
*/
void
ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
int unit, mru;
u_int32_t asyncmap;
int pcomp, accomp;
{
int x;
if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
quit();
}
if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
quit();
}
if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
quit();
}
x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
quit();
}
}
/*
* ccp_test - ask kernel whether a given compression method
* is acceptable for use. Returns 1 if the method and parameters
* are OK, 0 if the method is known but the parameters are not OK
* (e.g. code size should be reduced), or -1 if the method is unknown.
*/
int
ccp_test(unit, opt_ptr, opt_len, for_transmit)
int unit, opt_len, for_transmit;
u_char *opt_ptr;
{
struct ppp_option_data data;
data.ptr = opt_ptr;
data.length = opt_len;
data.transmit = for_transmit;
if (ioctl(ttyfd, 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(unit, isopen, isup)
int unit, isopen, isup;
{
int x;
if (ioctl(ppp_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(ppp_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(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
return 0;
}
return x & SC_DC_FERROR;
}
/*
* 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;
}
#ifdef PPP_FILTER
/*
* set_filters - transfer the pass and active filters to the kernel.
*/
int
set_filters(pass, active)
struct bpf_program *pass, *active;
{
int ret = 1;
if (pass->bf_len > 0) {
if (ioctl(ppp_fd, PPPIOCSPASS, pass) < 0) {
syslog(LOG_ERR, "Couldn't set pass-filter in kernel: %m");
ret = 0;
}
}
if (active->bf_len > 0) {
if (ioctl(ppp_fd, PPPIOCSACTIVE, active) < 0) {
syslog(LOG_ERR, "Couldn't set active-filter in kernel: %m");
ret = 0;
}
}
return ret;
}
#endif
/*
* sifvjcomp - config tcp header compression
*/
int
sifvjcomp(u, vjcomp, cidcomp, maxcid)
int u, vjcomp, cidcomp, maxcid;
{
u_int x;
if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
return 0;
}
x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
return 0;
}
if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
return 0;
}
return 1;
}
/*
* sifup - Config the interface up and enable IP packets to pass.
*/
int
sifup(u)
int u;
{
struct ifreq ifr;
strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
return 0;
}
ifr.ifr_flags |= IFF_UP;
if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
return 0;
}
if_is_up = 1;
return 1;
}
/*
* sifnpmode - Set the mode for handling packets for a given NP.
*/
int
sifnpmode(u, proto, mode)
int u;
int proto;
enum NPmode mode;
{
struct npioctl npi;
npi.protocol = proto;
npi.mode = mode;
if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
syslog(LOG_ERR, "ioctl(set NP %d mode to %d): %m", proto, mode);
return 0;
}
return 1;
}
/*
* sifdown - Config the interface down and disable IP.
*/
int
sifdown(u)
int u;
{
struct ifreq ifr;
int rv;
struct npioctl npi;
rv = 1;
npi.protocol = PPP_IP;
npi.mode = NPMODE_ERROR;
ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi);
/* ignore errors, because ppp_fd might have been closed by now. */
strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
rv = 0;
} else {
ifr.ifr_flags &= ~IFF_UP;
if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
rv = 0;
} else
if_is_up = 0;
}
return rv;
}
/*
* SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
* if it exists.
*/
#define SET_SA_FAMILY(addr, family) \
BZERO((char *) &(addr), sizeof(addr)); \
addr.sa_family = (family); \
addr.sa_len = sizeof(addr);
/*
* sifaddr - Config the interface IP addresses and netmask.
*/
int
sifaddr(u, o, h, m)
int u;
u_int32_t o, h, m;
{
struct ifaliasreq ifra;
struct ifreq ifr;
strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
if (m != 0) {
SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
} else
BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
BZERO(&ifr, sizeof(ifr));
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifr) < 0) {
if (errno != EADDRNOTAVAIL)
syslog(LOG_WARNING, "Couldn't remove interface address: %m");
}
if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
if (errno != EEXIST) {
syslog(LOG_ERR, "Couldn't set interface address: %m");
return 0;
}
syslog(LOG_WARNING,
"Couldn't set interface address: Address %s already exists",
ip_ntoa(o));
}
ifaddrs[0] = o;
ifaddrs[1] = h;
return 1;
}
/*
* cifaddr - Clear the interface IP addresses, and delete routes
* through the interface if possible.
*/
int
cifaddr(u, o, h)
int u;
u_int32_t o, h;
{
struct ifaliasreq ifra;
ifaddrs[0] = 0;
strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
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(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
if (errno != EADDRNOTAVAIL)
syslog(LOG_WARNING, "Couldn't delete interface address: %m");
return 0;
}
return 1;
}
/*
* sifdefaultroute - assign a default route through the address given.
*/
int
sifdefaultroute(u, l, g)
int u;
u_int32_t l, g;
{
return dodefaultroute(g, 's');
}
/*
* cifdefaultroute - delete a default route through the address given.
*/
int
cifdefaultroute(u, l, g)
int u;
u_int32_t l, g;
{
return dodefaultroute(g, 'c');
}
/*
* dodefaultroute - talk to a routing socket to add/delete a default route.
*/
static int
dodefaultroute(g, cmd)
u_int32_t g;
int cmd;
{
int routes;
struct {
struct rt_msghdr hdr;
struct sockaddr_in dst;
struct sockaddr_in gway;
struct sockaddr_in mask;
} rtmsg;
if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
syslog(LOG_ERR, "Couldn't %s default route: socket: %m",
cmd=='s'? "add": "delete");
return 0;
}
memset(&rtmsg, 0, sizeof(rtmsg));
rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
rtmsg.hdr.rtm_version = RTM_VERSION;
rtmsg.hdr.rtm_seq = ++rtm_seq;
rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
rtmsg.dst.sin_len = sizeof(rtmsg.dst);
rtmsg.dst.sin_family = AF_INET;
rtmsg.gway.sin_len = sizeof(rtmsg.gway);
rtmsg.gway.sin_family = AF_INET;
rtmsg.gway.sin_addr.s_addr = g;
rtmsg.mask.sin_len = sizeof(rtmsg.dst);
rtmsg.mask.sin_family = AF_INET;
rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
syslog(LOG_ERR, "Couldn't %s default route: %m",
cmd=='s'? "add": "delete");
close(routes);
return 0;
}
close(routes);
default_route_gateway = (cmd == 's')? g: 0;
return 1;
}
#if RTM_VERSION >= 3
/*
* sifproxyarp - Make a proxy ARP entry for the peer.
*/
static struct {
struct rt_msghdr hdr;
struct sockaddr_inarp dst;
struct sockaddr_dl hwa;
char extra[128];
} arpmsg;
static int arpmsg_valid;
int
sifproxyarp(unit, hisaddr)
int unit;
u_int32_t hisaddr;
{
int routes;
/*
* Get the hardware address of an interface on the same subnet
* as our local address.
*/
memset(&arpmsg, 0, sizeof(arpmsg));
if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
return 0;
}
if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
syslog(LOG_ERR, "Couldn't add proxy arp entry: socket: %m");
return 0;
}
arpmsg.hdr.rtm_type = RTM_ADD;
arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
arpmsg.hdr.rtm_version = RTM_VERSION;
arpmsg.hdr.rtm_seq = ++rtm_seq;
arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
arpmsg.hdr.rtm_inits = RTV_EXPIRE;
arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
arpmsg.dst.sin_family = AF_INET;
arpmsg.dst.sin_addr.s_addr = hisaddr;
arpmsg.dst.sin_other = SIN_PROXY;
arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
+ arpmsg.hwa.sdl_len;
if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
syslog(LOG_ERR, "Couldn't add proxy arp entry: %m");
close(routes);
return 0;
}
close(routes);
arpmsg_valid = 1;
proxy_arp_addr = hisaddr;
return 1;
}
/*
* cifproxyarp - Delete the proxy ARP entry for the peer.
*/
int
cifproxyarp(unit, hisaddr)
int unit;
u_int32_t hisaddr;
{
int routes;
if (!arpmsg_valid)
return 0;
arpmsg_valid = 0;
arpmsg.hdr.rtm_type = RTM_DELETE;
arpmsg.hdr.rtm_seq = ++rtm_seq;
if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
syslog(LOG_ERR, "Couldn't delete proxy arp entry: socket: %m");
return 0;
}
if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
syslog(LOG_ERR, "Couldn't delete proxy arp entry: %m");
close(routes);
return 0;
}
close(routes);
proxy_arp_addr = 0;
return 1;
}
#else /* RTM_VERSION */
/*
* sifproxyarp - Make a proxy ARP entry for the peer.
*/
int
sifproxyarp(unit, hisaddr)
int unit;
u_int32_t hisaddr;
{
struct arpreq arpreq;
struct {
struct sockaddr_dl sdl;
char space[128];
} dls;
BZERO(&arpreq, sizeof(arpreq));
/*
* Get the hardware address of an interface on the same subnet
* as our local address.
*/
if (!get_ether_addr(hisaddr, &dls.sdl)) {
syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
return 0;
}
arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
arpreq.arp_ha.sa_family = AF_UNSPEC;
BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
arpreq.arp_flags = ATF_PERM | ATF_PUBL;
if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
syslog(LOG_ERR, "Couldn't add proxy arp entry: %m");
return 0;
}
proxy_arp_addr = hisaddr;
return 1;
}
/*
* cifproxyarp - Delete the proxy ARP entry for the peer.
*/
int
cifproxyarp(unit, hisaddr)
int unit;
u_int32_t hisaddr;
{
struct arpreq arpreq;
BZERO(&arpreq, sizeof(arpreq));
SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
syslog(LOG_WARNING, "Couldn't delete proxy arp entry: %m");
return 0;
}
proxy_arp_addr = 0;
return 1;
}
#endif /* RTM_VERSION */
#ifdef IPX_CHANGE
/********************************************************************
*
* sipxfaddr - Config the interface IPX networknumber
*/
int
sipxfaddr (int unit, unsigned long int network, unsigned char * node )
{
int result = 1;
int skfd;
struct sockaddr_ipx ipx_addr;
struct ifreq ifr;
struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
union ipx_net_u net;
skfd = socket (AF_IPX, SOCK_DGRAM, 0);
if (skfd < 0)
{
syslog (LOG_DEBUG, "socket(AF_IPX): %m(%d)", errno);
result = 0;
}
else
{
memset (&ifr, '\0', sizeof (ifr));
strcpy (ifr.ifr_name, ifname);
memcpy (sipx->sipx_addr.x_host.c_host, node, 6);
sipx->sipx_len = sizeof(sipx);
sipx->sipx_family = AF_IPX;
sipx->sipx_port = 0;
memset(&net, 0, sizeof(net));
net.long_e = htonl (network);
sipx->sipx_addr.x_net = net.net_e;
/*
* Set the IPX device
*/
if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0)
{
result = 0;
if (errno != EEXIST)
{
syslog (LOG_DEBUG,
"ioctl(SIOCAIFADDR, CRTITF): %m(%d)", errno);
}
else
{
syslog (LOG_WARNING,
"ioctl(SIOCAIFADDR, CRTITF): Address already exists");
}
}
close (skfd);
}
return result;
}
/********************************************************************
*
* 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 cipxfaddr (int unit)
{
int result = 1;
int skfd;
struct sockaddr_ipx ipx_addr;
struct ifreq ifr;
struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
skfd = socket (AF_IPX, SOCK_DGRAM, 0);
if (skfd < 0)
{
syslog (LOG_DEBUG, "socket(AF_IPX): %m(%d)", errno);
result = 0;
}
else
{
memset (&ifr, '\0', sizeof (ifr));
strcpy (ifr.ifr_name, ifname);
sipx->sipx_len = sizeof(sipx);
sipx->sipx_family = AF_IPX;
/*
* Set the IPX device
*/
if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0)
{
syslog (LOG_INFO,
"ioctl(SIOCAIFADDR, IPX_DLTITF): %m(%d)", errno);
result = 0;
}
close (skfd);
}
return result;
}
#endif
/*
* get_ether_addr - get the hardware address of an interface on the
* the same subnet as ipaddr.
*/
#define MAX_IFS 32
static int
get_ether_addr(ipaddr, hwaddr)
u_int32_t ipaddr;
struct sockaddr_dl *hwaddr;
{
struct ifreq *ifr, *ifend, *ifp;
u_int32_t 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(sockfd, SIOCGIFCONF, &ifc) < 0) {
syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
return 0;
}
/*
* Scan through looking for an interface with an Internet
* address on the same subnet as `ipaddr'.
*/
ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
for (ifr = ifc.ifc_req; ifr < ifend;
ifr = (struct ifreq *) ((char *)&ifr->ifr_addr
+ MAX(ifr->ifr_addr.sa_len, sizeof(ifr->ifr_addr)))) {
if (ifr->ifr_addr.sa_family == AF_INET) {
ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
/*
* Check that the interface is up, and not point-to-point
* or loopback.
*/
if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
continue;
if ((ifreq.ifr_flags &
(IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
!= (IFF_UP|IFF_BROADCAST))
continue;
/*
* Get its netmask and check that it's on the right subnet.
*/
if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
continue;
mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
if ((ipaddr & mask) != (ina & mask))
continue;
break;
}
}
if (ifr >= ifend)
return 0;
syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
/*
* Now scan through again looking for a link-level address
* for this interface.
*/
ifp = ifr;
for (ifr = ifc.ifc_req; ifr < ifend; ) {
if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
&& ifr->ifr_addr.sa_family == AF_LINK) {
/*
* Found the link-level address - copy it out
*/
dla = (struct sockaddr_dl *) &ifr->ifr_addr;
BCOPY(dla, hwaddr, dla->sdl_len);
return 1;
}
ifr = (struct ifreq *) ((char *)&ifr->ifr_addr
+ MAX(ifr->ifr_addr.sa_len, sizeof(ifr->ifr_addr)));
}
return 0;
}
/*
* Return user specified netmask, modified by any mask we might determine
* for address `addr' (in network byte order).
* Here we scan through the system's list of interfaces, looking for
* any non-point-to-point interfaces which might appear to be on the same
* network as `addr'. If we find any, we OR in their netmask to the
* user-specified netmask.
*/
u_int32_t
GetMask(addr)
u_int32_t addr;
{
u_int32_t mask, nmask, ina;
struct ifreq *ifr, *ifend, ifreq;
struct ifconf ifc;
struct ifreq ifs[MAX_IFS];
addr = ntohl(addr);
if (IN_CLASSA(addr)) /* determine network mask for address class */
nmask = IN_CLASSA_NET;
else if (IN_CLASSB(addr))
nmask = IN_CLASSB_NET;
else
nmask = IN_CLASSC_NET;
/* class D nets are disallowed by bad_ip_adrs */
mask = netmask | htonl(nmask);
/*
* Scan through the system's network interfaces.
*/
ifc.ifc_len = sizeof(ifs);
ifc.ifc_req = ifs;
if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m");
return mask;
}
ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
for (ifr = ifc.ifc_req; ifr < ifend;
ifr = (struct ifreq *) ((char *)&ifr->ifr_addr
+ MAX(ifr->ifr_addr.sa_len, sizeof(ifr->ifr_addr)))) {
/*
* 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;
}
/*
* Use the hostid as part of the random number seed.
*/
int
get_host_seed()
{
return gethostid();
}
/*
* lock - create a lock file for the named lock device
*/
#define LOCK_PREFIX "/var/spool/lock/LCK.."
int
lock(dev)
char *dev;
{
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) {
syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
close(fd);
} else {
hdb_lock_buffer[n] = 0;
pid = atoi(hdb_lock_buffer);
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;
}
sprintf(hdb_lock_buffer, "%10d\n", getpid());
write(fd, hdb_lock_buffer, 11);
close(fd);
return 0;
}
/*
* unlock - remove our lockfile
*/
void
unlock()
{
if (lock_file) {
unlink(lock_file);
free(lock_file);
lock_file = NULL;
}
}
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