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freebsd-src/usr.sbin/pppd/sys-bsd.c
Kevin Lo 784bddbc5b Cleanup of userland __P use
2007-11-07 10:53:41 +00:00

1698 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>
#include <net/if_var.h>
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#include <ifaddrs.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 <ifaddrs.h>
#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 */
#ifdef INET6
static int sock6_fd = -1; /* socket for doing ipv6 interface ioctls */
#endif /* INET6 */
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(u_int32_t, int);
static int get_ether_addr(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);
}
#ifdef INET6
if ((sock6_fd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
/* check it at runtime */
sock6_fd = -1;
}
#endif
}
/*
* 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()
{
if (sockfd >= 0)
close(sockfd);
#ifdef INET6
if (sock6_fd >= 0)
close(sock6_fd);
#endif
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);
}
#ifdef INET6
/*
* sif6addr - Config the interface with an IPv6 link-local address
*/
int
sif6addr(int unit, eui64_t our_eui64, eui64_t his_eui64)
{
int ifindex;
struct in6_aliasreq addreq6;
if (sock6_fd < 0) {
syslog(LOG_ERR, "No IPv6 socket available");
die(1);
/*NOTREACHED*/
}
/* actually, this part is not kame local - RFC2553 conformant */
ifindex = if_nametoindex(ifname);
if (ifindex == 0) {
syslog(LOG_ERR, "sifaddr6: no interface %s", ifname);
return 0;
}
memset(&addreq6, 0, sizeof(addreq6));
strlcpy(addreq6.ifra_name, ifname, sizeof(addreq6.ifra_name));
/* my addr */
addreq6.ifra_addr.sin6_family = AF_INET6;
addreq6.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
addreq6.ifra_addr.sin6_addr.s6_addr[0] = 0xfe;
addreq6.ifra_addr.sin6_addr.s6_addr[1] = 0x80;
memcpy(&addreq6.ifra_addr.sin6_addr.s6_addr[8], &our_eui64,
sizeof(our_eui64));
/* KAME ifindex hack */
*(u_int16_t *)&addreq6.ifra_addr.sin6_addr.s6_addr[2] = htons(ifindex);
/* his addr */
addreq6.ifra_dstaddr.sin6_family = AF_INET6;
addreq6.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
addreq6.ifra_dstaddr.sin6_addr.s6_addr[0] = 0xfe;
addreq6.ifra_dstaddr.sin6_addr.s6_addr[1] = 0x80;
memcpy(&addreq6.ifra_dstaddr.sin6_addr.s6_addr[8], &his_eui64,
sizeof(our_eui64));
/* KAME ifindex hack */
*(u_int16_t *)&addreq6.ifra_dstaddr.sin6_addr.s6_addr[2] = htons(ifindex);
/* prefix mask: 128bit */
addreq6.ifra_prefixmask.sin6_family = AF_INET6;
addreq6.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
memset(&addreq6.ifra_prefixmask.sin6_addr, 0xff,
sizeof(addreq6.ifra_prefixmask.sin6_addr));
/* address lifetime (infty) */
addreq6.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
addreq6.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
if (ioctl(sock6_fd, SIOCAIFADDR_IN6, &addreq6) < 0) {
syslog(LOG_ERR, "sif6addr: ioctl(SIOCAIFADDR_IN6): %m");
return 0;
}
return 1;
}
/*
* cif6addr - Remove IPv6 address from interface
*/
int
cif6addr(int unit, eui64_t our_eui64, eui64_t his_eui64)
{
int ifindex;
struct in6_ifreq delreq6;
if (sock6_fd < 0) {
syslog(LOG_ERR, "No IPv6 socket available");
die(1);
/*NOTREACHED*/
}
/* actually, this part is not kame local - RFC2553 conformant */
ifindex = if_nametoindex(ifname);
if (ifindex == 0) {
syslog(LOG_ERR, "cifaddr6: no interface %s", ifname);
return 0;
}
memset(&delreq6, 0, sizeof(delreq6));
strlcpy(delreq6.ifr_name, ifname, sizeof(delreq6.ifr_name));
/* my addr */
delreq6.ifr_ifru.ifru_addr.sin6_family = AF_INET6;
delreq6.ifr_ifru.ifru_addr.sin6_len = sizeof(struct sockaddr_in6);
delreq6.ifr_ifru.ifru_addr.sin6_addr.s6_addr[0] = 0xfe;
delreq6.ifr_ifru.ifru_addr.sin6_addr.s6_addr[1] = 0x80;
memcpy(&delreq6.ifr_ifru.ifru_addr.sin6_addr.s6_addr[8], &our_eui64,
sizeof(our_eui64));
/* KAME ifindex hack */
*(u_int16_t *)&delreq6.ifr_ifru.ifru_addr.sin6_addr.s6_addr[2] =
htons(ifindex);
if (ioctl(sock6_fd, SIOCDIFADDR_IN6, &delreq6) < 0) {
syslog(LOG_ERR, "cif6addr: ioctl(SIOCDIFADDR_IN6): %m");
return 0;
}
return 1;
}
#endif /* INET6 */
/*
* 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.
*/
static int
get_ether_addr(ipaddr, hwaddr)
u_int32_t ipaddr;
struct sockaddr_dl *hwaddr;
{
u_int32_t ina, mask;
struct sockaddr_dl *dla;
struct ifaddrs *ifap, *ifa, *ifp;
/*
* Scan through looking for an interface with an Internet
* address on the same subnet as `ipaddr'.
*/
if (getifaddrs(&ifap) != 0) {
syslog(LOG_ERR, "getifaddrs: %m");
return 0;
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
ina = ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr.s_addr;
/*
* Check that the interface is up, and not point-to-point
* or loopback.
*/
if ((ifa->ifa_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.
*/
mask = ((struct sockaddr_in *) ifa->ifa_netmask)->sin_addr.s_addr;
if ((ipaddr & mask) != (ina & mask))
continue;
break;
}
if (!ifa) {
freeifaddrs(ifap);
return 0;
}
syslog(LOG_INFO, "found interface %s for proxy arp", ifa->ifa_name);
/*
* Now scan through again looking for a link-level address
* for this interface.
*/
ifp = ifa;
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (strcmp(ifp->ifa_name, ifa->ifa_name) != 0)
continue;
if (ifa->ifa_addr->sa_family != AF_LINK)
continue;
/*
* Found the link-level address - copy it out
*/
dla = (struct sockaddr_dl *) ifa->ifa_addr;
BCOPY(dla, hwaddr, dla->sdl_len);
freeifaddrs(ifap);
return 1;
}
freeifaddrs(ifap);
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 ifaddrs *ifap, *ifa;
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.
*/
if (getifaddrs(&ifap) != 0) {
syslog(LOG_WARNING, "getifaddrs: %m");
return mask;
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
/*
* Check the interface's internet address.
*/
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
ina = ((struct sockaddr_in *)&ifa->ifa_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.
*/
if ((ifa->ifa_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK)) != IFF_UP)
continue;
/*
* Get its netmask and OR it into our mask.
*/
mask |= ((struct sockaddr_in *)&ifa->ifa_netmask)->sin_addr.s_addr;
}
freeifaddrs(ifap);
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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