mirrors/ppp
0
0
Fork 0
mirror of https://github.com/paulusmack/ppp.git synced 2024-11-28 05:53:51 +08:00
Code Issues Packages Projects Releases Wiki Activity
3bc92613d8
ppp/pppd/sys-osf.c
Paul Mackerras e8be982dbc Move some stuff (printing, logging, [un]locking) into utils.c. 
Unified the locking code, added relock().
Revert strlcpy to strncpy when filling in utmp structs.
Fixed some bugs in DNS addr option handling.
Set PPPLOGNAME with login name of user.
Moved daemon() logic into detach().
Fix bug where errno was clobbered by seteuid().
Use pty in sys-linux.c when making a ppp unit.
1999-04-12 06:24:53 +00:00

1799 lines
41 KiB
C
Raw Blame History

/*
* System-dependent procedures for pppd under Digital UNIX (OSF/1).
*
* Copyright (c) 1994 The Australian National University.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, provided that the above copyright
* notice appears in all copies. This software is provided without any
* warranty, express or implied. The Australian National University
* makes no representations about the suitability of this software for
* any purpose.
*
* IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
* THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
* OR MODIFICATIONS.
*/
#ifndef lint
static char rcsid[] = "$Id: sys-osf.c,v 1.25 1999/04/12 06:24:50 paulus Exp $";
#endif
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <signal.h>
#include <malloc.h>
#include <utmp.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stream.h>
#include <sys/stropts.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/poll.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_arp.h>
#include <net/route.h>
#include <net/ppp_defs.h>
#include <net/pppio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "pppd.h"
static int pppfd;
static int fdmuxid = -1;
static int iffd;
static int sockfd;
static int restore_term;
static struct termios inittermios;
static struct winsize wsinfo; /* Initial window size info */
static pid_t tty_sid; /* PID of our session leader */
extern u_char inpacket_buf[]; /* borrowed from main.c */
static int link_mtu, link_mru;
#define NMODULES 32
static int tty_nmodules;
static char tty_modules[NMODULES][FMNAMESZ+1];
static int closed_stdio;
static int initfdflags = -1;
static int orig_ttyfd = -1;
static int if_is_up; /* Interface has been marked up */
static u_int32_t ifaddrs[2]; /* local and remote addresses */
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 */
#define MAX_POLLFDS 32
static struct pollfd pollfds[MAX_POLLFDS];
static int n_pollfds;
/* Prototypes for procedures local to this file. */
static int translate_speed __P((int));
static int baud_rate_of __P((int));
static int get_ether_addr __P((u_int32_t, struct sockaddr *));
static int strioctl __P((int, int, void *, int, int));
/*
* sys_init - System-dependent initialization.
*/
void
sys_init()
{
int x;
openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
setlogmask(LOG_UPTO(LOG_INFO));
if (debug)
setlogmask(LOG_UPTO(LOG_DEBUG));
/* Get an internet socket for doing socket ioctl's on. */
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
fatal("Couldn't create IP socket: %m");
if (default_device)
tty_sid = getsid((pid_t)0);
/*
* Open the ppp device.
*/
pppfd = open("/dev/streams/ppp", O_RDWR | O_NONBLOCK, 0);
if (pppfd < 0)
fatal("Can't open /dev/streams/ppp: %m");
if (kdebugflag) {
x = PPPDBG_LOG + PPPDBG_DRIVER;
strioctl(pppfd, PPPIO_DEBUG, &x, sizeof(int), 0);
}
/* Assign a new PPA and get its unit number. */
if (strioctl(pppfd, PPPIO_NEWPPA, &ifunit, 0, sizeof(int)) < 0)
fatal("Can't create new PPP interface: %m");
/*
* Open the ppp device again and push the if_ppp module on it.
*/
iffd = open("/dev/streams/ppp", O_RDWR, 0);
if (iffd < 0)
fatal("Can't open /dev/streams/ppp (2): %m");
if (kdebugflag) {
x = PPPDBG_LOG + PPPDBG_DRIVER;
strioctl(iffd, PPPIO_DEBUG, &x, sizeof(int), 0);
}
if (strioctl(iffd, PPPIO_ATTACH, &ifunit, sizeof(int), 0) < 0)
fatal("Couldn't attach ppp interface to device: %m");
if (ioctl(iffd, I_PUSH, "if_ppp") < 0)
fatal("Can't push ppp interface module: %m");
if (kdebugflag) {
x = PPPDBG_LOG + PPPDBG_IF;
strioctl(iffd, PPPIO_DEBUG, &x, sizeof(int), 0);
}
if (strioctl(iffd, PPPIO_NEWPPA, &ifunit, sizeof(int), 0) < 0)
fatal("Couldn't create ppp interface unit: %m");
x = PPP_IP;
if (strioctl(iffd, PPPIO_BIND, &x, sizeof(int), 0) < 0)
fatal("Couldn't bind ppp interface to IP SAP: %m");
n_pollfds = 0;
}
/*
* 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()
{
if (if_is_up)
sifdown(0);
if (ifaddrs[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(iffd);
close(pppfd);
close(sockfd);
closelog();
}
/*
* sys_check_options - check the options that the user specified
*/
int
sys_check_options()
{
return 1;
}
#if 0
/*
* daemon - Detach us from controlling terminal session.
*/
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);
}
return 0;
}
#endif
/*
* ppp_available - check whether the system has any ppp interfaces
*/
int
ppp_available()
{
struct stat buf;
return stat("/dev/streams/ppp", &buf) >= 0;
}
char pipename[] = "/dev/streams/pipe";
/*
* streampipe -- Opens a STREAMS based pipe. Used by streamify().
*/
int
streampipe(int fd[2])
{
if ((fd[0]=open(pipename, O_RDWR)) == -1)
return(-1);
else if ((fd[1]=open(pipename, O_RDWR)) == -1) {
close(fd[0]);
return(-1);
} else if (ioctl(fd[0], I_PIPE, fd[1]) != 0) {
close(fd[0]);
close(fd[1]);
return(-1);
} else {
return(ioctl(fd[0], I_PUSH, "pipemod"));
}
}
/*
* streamify -- Needed for Digital UNIX, since some tty devices are not STREAMS
* modules (but ptys are, and pipes can be).
*/
#define BUFFSIZE 1000 /* Size of buffer for streamify() */
int
streamify(int fd)
{
int fdes[2];
fd_set readfds;
int ret, fret, rret, maxfd;
static char buffer[BUFFSIZE];
struct sigaction sa;
if (streampipe(fdes) != 0)
error("streampipe(): %m\n");
else if (isastream(fdes[0]) == 1) {
if ((fret=fork()) < 0) {
error("fork(): %m\n");
} else if (fret == 0) {
/* Process to forward things from pipe to tty */
sigemptyset(&(sa.sa_mask));
sa.sa_handler = SIG_DFL;
sa.sa_flags = 0;
sigaction(SIGHUP, &sa, NULL); /* Go back to default actions */
sigaction(SIGINT, &sa, NULL); /* for changed signals. */
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGCHLD, &sa, NULL);
sigaction(SIGUSR1, &sa, NULL);
sigaction(SIGUSR2, &sa, NULL);
close(fdes[0]);
maxfd = (fdes[1]>fd)?fdes[1]:fd;
while (1) {
FD_ZERO(&readfds);
FD_SET(fdes[1], &readfds);
FD_SET(fd, &readfds);
ret = select(maxfd+1, &readfds, NULL, NULL, NULL);
if (FD_ISSET(fd, &readfds)) {
rret = read(fd, buffer, BUFFSIZE);
if (rret == 0) {
SYSDEBUG(("slave died: EOF on tty."));
exit(0);
} else {
write(fdes[1], buffer, rret);
}
}
if (FD_ISSET(fdes[1], &readfds)) {
rret = read(fdes[1], buffer, BUFFSIZE);
if (rret == 0) {
SYSDEBUG(("slave died: EOF on pipe."));
exit(0);
} else {
write(fd, buffer, rret);
}
}
}
} else {
close(fdes[1]);
orig_ttyfd = fd;
return(fdes[0]);
}
}
return(-1);
}
/*
* establish_ppp - Turn the serial port into a ppp interface.
*/
int
establish_ppp(fd)
int fd;
{
int i;
if (isastream(fd) != 1) {
if ((ttyfd = fd = streamify(fd)) < 0)
fatal("Couldn't get a STREAMS module!\n");
}
/* Pop any existing modules off the tty stream. */
for (i = 0;; ++i) {
if (ioctl(fd, I_LOOK, tty_modules[i]) < 0
|| ioctl(fd, I_POP, 0) < 0)
break;
error("popping module %s\n", tty_modules[i]);
}
tty_nmodules = i;
/* Push the async hdlc module and the compressor module. */
if (ioctl(fd, I_PUSH, "ppp_ahdl") < 0)
fatal("Couldn't push PPP Async HDLC module: %m");
if (ioctl(fd, I_PUSH, "ppp_comp") < 0)
error("Couldn't push PPP compression module: %m");
/* read mode, message non-discard mode */
if (ioctl(fd, I_SRDOPT, RMSGN|RPROTNORM) < 0)
fatal("ioctl(I_SRDOPT, RMSGN): %m");
/* Link the serial port under the PPP multiplexor. */
if ((fdmuxid = ioctl(pppfd, I_LINK, fd)) < 0)
fatal("Can't link tty to PPP mux: %m");
/* close stdin, stdout, stderr if they might refer to the device */
if (default_device && !closed_stdio) {
int i;
for (i = 0; i <= 2; ++i)
if (i != fd && i != sockfd)
close(i);
closed_stdio = 1;
}
/*
* Set device for non-blocking reads.
* XXX why do we need to do this? don't we use pppfd not fd?
*/
if ((initfdflags = fcntl(fd, F_GETFL)) == -1
|| fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
warn("Couldn't set device to non-blocking mode: %m");
}
return pppfd;
}
/*
* restore_loop - reattach the ppp unit to the loopback.
* This doesn't need to do anything because disestablish_ppp does it.
*/
void
restore_loop()
{
}
/*
* disestablish_ppp - Restore the serial port to normal operation.
* It attempts to reconstruct the stream with the previously popped
* modules. This shouldn't call die() because it's called from die().
*/
void
disestablish_ppp(fd)
int fd;
{
int i;
if (fdmuxid >= 0) {
if (ioctl(pppfd, I_UNLINK, fdmuxid) < 0) {
if (!hungup)
error("Can't unlink tty from PPP mux: %m");
}
fdmuxid = -1;
/* Reset non-blocking mode on the file descriptor. */
if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
warn("Couldn't restore device fd flags: %m");
initfdflags = -1;
if (!hungup) {
while (ioctl(fd, I_POP, 0) >= 0)
;
for (i = tty_nmodules - 1; i >= 0; --i)
if (ioctl(fd, I_PUSH, tty_modules[i]) < 0)
error("Couldn't restore tty module %s: %m",
tty_modules[i]);
}
if (hungup && default_device && tty_sid > 0) {
/*
* If we have received a hangup, we need to send a SIGHUP
* to the terminal's controlling process. The reason is
* that the original stream head for the terminal hasn't
* seen the M_HANGUP message (it went up through the ppp
* driver to the stream head for our fd to /dev/ppp).
*/
dbglog("sending hangup to %d", tty_sid);
if (kill(tty_sid, SIGHUP) < 0)
error("couldn't kill pgrp: %m");
}
if (orig_ttyfd >= 0) {
close(fd);
(void)wait((void *)0);
ttyfd = orig_ttyfd;
orig_ttyfd = -1;
}
}
}
/*
* Check whether the link seems not to be 8-bit clean.
*/
void
clean_check()
{
int x;
char *s;
if (strioctl(pppfd, PPPIO_GCLEAN, &x, 0, sizeof(x)) < 0)
return;
s = NULL;
switch (~x) {
case RCV_B7_0:
s = "bit 7 set to 1";
break;
case RCV_B7_1:
s = "bit 7 set to 0";
break;
case RCV_EVNP:
s = "odd parity";
break;
case RCV_ODDP:
s = "even parity";
break;
}
if (s != NULL) {
warn("Serial link is not 8-bit clean:");
warn("All received characters had %s", s);
}
}
/*
* List of valid speeds.
*/
struct speed {
int speed_int, speed_val;
} speeds[] = {
#ifdef B50
{ 50, B50 },
#endif
#ifdef B75
{ 75, B75 },
#endif
#ifdef B110
{ 110, B110 },
#endif
#ifdef B134
{ 134, B134 },
#endif
#ifdef B150
{ 150, B150 },
#endif
#ifdef B200
{ 200, B200 },
#endif
#ifdef B300
{ 300, B300 },
#endif
#ifdef B600
{ 600, B600 },
#endif
#ifdef B1200
{ 1200, B1200 },
#endif
#ifdef B1800
{ 1800, B1800 },
#endif
#ifdef B2000
{ 2000, B2000 },
#endif
#ifdef B2400
{ 2400, B2400 },
#endif
#ifdef B3600
{ 3600, B3600 },
#endif
#ifdef B4800
{ 4800, B4800 },
#endif
#ifdef B7200
{ 7200, B7200 },
#endif
#ifdef B9600
{ 9600, B9600 },
#endif
#ifdef B19200
{ 19200, B19200 },
#endif
#ifdef B38400
{ 38400, B38400 },
#endif
#ifdef EXTA
{ 19200, EXTA },
#endif
#ifdef EXTB
{ 38400, EXTB },
#endif
#ifdef B57600
{ 57600, B57600 },
#endif
#ifdef B115200
{ 115200, B115200 },
#endif
{ 0, 0 }
};
/*
* Translate from bits/second to a speed_t.
*/
static int
translate_speed(bps)
int bps;
{
struct speed *speedp;
if (bps == 0)
return 0;
for (speedp = speeds; speedp->speed_int; speedp++)
if (bps == speedp->speed_int)
return speedp->speed_val;
warn("speed %d not supported", bps);
return 0;
}
/*
* Translate from a speed_t to bits/second.
*/
static int
baud_rate_of(speed)
int speed;
{
struct speed *speedp;
if (speed == 0)
return 0;
for (speedp = speeds; speedp->speed_int; speedp++)
if (speed == speedp->speed_val)
return speedp->speed_int;
return 0;
}
/*
* set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
* at the requested speed, etc. If `local' is true, set CLOCAL
* regardless of whether the modem option was specified.
*/
void
set_up_tty(fd, local)
int fd, local;
{
int speed;
struct termios tios;
if (tcgetattr(fd, &tios) < 0)
fatal("tcgetattr: %m");
if (!restore_term) {
inittermios = tios;
ioctl(fd, TIOCGWINSZ, &wsinfo);
}
tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
if (crtscts > 0)
tios.c_cflag |= CRTSCTS;
else if (crtscts < 0)
tios.c_cflag &= ~CRTSCTS;
tios.c_cflag |= CS8 | CREAD | HUPCL;
if (local || !modem)
tios.c_cflag |= CLOCAL;
tios.c_iflag = IGNBRK | IGNPAR;
tios.c_oflag = 0;
tios.c_lflag = 0;
tios.c_cc[VMIN] = 1;
tios.c_cc[VTIME] = 0;
if (crtscts == -2) {
tios.c_iflag |= IXON | IXOFF;
tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
}
speed = translate_speed(inspeed);
if (speed) {
cfsetospeed(&tios, speed);
cfsetispeed(&tios, speed);
} else {
speed = cfgetospeed(&tios);
/*
* We can't proceed if the serial port speed is 0,
* since that implies that the serial port is disabled.
*/
if (speed == B0)
fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
}
if (tcsetattr(fd, TCSAFLUSH, &tios) < 0)
fatal("tcsetattr: %m");
baud_rate = inspeed = baud_rate_of(speed);
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 (!hungup && errno != ENXIO)
warn("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_loopback - open the device we use for getting packets
* in demand mode. Under Digital Unix, we use our existing fd
* to the ppp driver.
*/
int
open_ppp_loopback()
{
return pppfd;
}
/*
* output - Output PPP packet.
*/
void
output(unit, p, len)
int unit;
u_char *p;
int len;
{
struct strbuf data;
int retries;
struct pollfd pfd;
if (debug)
dbglog("sent %P", p, len);
data.len = len;
data.buf = (caddr_t) p;
retries = 4;
while (putmsg(pppfd, NULL, &data, 0) < 0) {
if (--retries < 0 || (errno != EWOULDBLOCK && errno != EAGAIN)) {
if (errno != ENXIO)
error("Couldn't send packet: %m");
break;
}
pfd.fd = pppfd;
pfd.events = POLLOUT;
poll(&pfd, 1, 250); /* wait for up to 0.25 seconds */
}
}
/*
* wait_input - wait until there is data available on fd,
* for the length of time specified by *timo (indefinite
* if timo is NULL).
*/
void
wait_input(timo)
struct timeval *timo;
{
int t;
t = timo == NULL? -1: timo->tv_sec * 1000 + timo->tv_usec / 1000;
if (poll(pollfds, n_pollfds, t) < 0 && errno != EINTR)
fatal("poll: %m");
}
/*
* add_fd - add an fd to the set that wait_input waits for.
*/
void add_fd(fd)
int fd;
{
int n;
for (n = 0; n < n_pollfds; ++n)
if (pollfds[n].fd == fd)
return;
if (n_pollfds < MAX_POLLFDS) {
pollfds[n_pollfds].fd = fd;
pollfds[n_pollfds].events = POLLIN | POLLPRI | POLLHUP;
++n_pollfds;
} else
error("Too many inputs!");
}
/*
* remove_fd - remove an fd from the set that wait_input waits for.
*/
void remove_fd(fd)
int fd;
{
int n;
for (n = 0; n < n_pollfds; ++n) {
if (pollfds[n].fd == fd) {
while (++n < n_pollfds)
pollfds[n-1] = pollfds[n];
--n_pollfds;
break;
}
}
}
#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;
{
wait_input(timo);
}
/*
* 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");
}
#endif
/*
* read_packet - get a PPP packet from the serial device.
*/
int
read_packet(buf)
u_char *buf;
{
struct strbuf ctrl, data;
int flags, len;
unsigned char ctrlbuf[64];
for (;;) {
data.maxlen = PPP_MRU + PPP_HDRLEN;
data.buf = (caddr_t) buf;
ctrl.maxlen = sizeof(ctrlbuf);
ctrl.buf = (caddr_t) ctrlbuf;
flags = 0;
len = getmsg(pppfd, &ctrl, &data, &flags);
if (len < 0) {
if (errno = EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
return -1;
fatal("Error reading packet: %m");
}
if (ctrl.len <= 0)
return data.len;
/*
* Got a M_PROTO or M_PCPROTO message. Huh?
*/
if (debug)
dbglog("got ctrl msg len=%d", ctrl.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()
{
int len;
int rv = 0;
while ((len = read_packet(inpacket_buf)) > 0) {
if (loop_frame(inpacket_buf, len))
rv = 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;
{
int cf[2];
link_mtu = mtu;
if (strioctl(pppfd, PPPIO_MTU, &mtu, sizeof(mtu), 0) < 0) {
if (hungup && errno == ENXIO)
return;
error("Couldn't set MTU: %m");
}
if (strioctl(pppfd, PPPIO_XACCM, &asyncmap, sizeof(asyncmap), 0) < 0) {
error("Couldn't set transmit ACCM: %m");
}
cf[0] = (pcomp? COMP_PROT: 0) + (accomp? COMP_AC: 0);
cf[1] = COMP_PROT | COMP_AC;
if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
error("Couldn't set prot/AC compression: %m");
}
}
/*
* ppp_set_xaccm - set the extended transmit ACCM for the interface.
*/
void
ppp_set_xaccm(unit, accm)
int unit;
ext_accm accm;
{
if (strioctl(pppfd, PPPIO_XACCM, accm, sizeof(ext_accm), 0) < 0) {
if (!hungup || errno != ENXIO)
warn("Couldn't 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 cf[2];
link_mru = mru;
if (strioctl(pppfd, PPPIO_MRU, &mru, sizeof(mru), 0) < 0) {
if (hungup && errno == ENXIO)
return;
error("Couldn't set MRU: %m");
}
if (strioctl(pppfd, PPPIO_RACCM, &asyncmap, sizeof(asyncmap), 0) < 0) {
error("Couldn't set receive ACCM: %m");
}
cf[0] = (pcomp? DECOMP_PROT: 0) + (accomp? DECOMP_AC: 0);
cf[1] = DECOMP_PROT | DECOMP_AC;
if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
error("Couldn't set prot/AC decompression: %m");
}
}
/*
* ccp_test - ask kernel whether a given compression method
* is acceptable for use.
*
* In Digital UNIX the memory buckets for chunks >16K are not
* primed when the system comes up. That means we're not
* likely to get the memory needed for the compressor on
* the first try. The way we work around this is to have
* the driver spin off a thread to go get the memory for us
* (we can't block at that point in a streams context.)
*
* This code synchronizes with the thread when it has returned
* with the memory we need. The driver will continue to return
* with EAGAIN until the thread comes back. We give up here
* if after 10 attempts in one second we still don't have memory.
* It's up to the driver to not lose track of that memory if
* thread takes too long to return.
*/
int
ccp_test(unit, opt_ptr, opt_len, for_transmit)
int unit, opt_len, for_transmit;
u_char *opt_ptr;
{
struct timeval tval;
int i;
tval.tv_sec = 0;
tval.tv_usec = 100000;
for (i = 0; i < 10; ++i) {
if (strioctl(pppfd, (for_transmit? PPPIO_XCOMP: PPPIO_RCOMP),
opt_ptr, opt_len, 0) >= 0) {
return 1;
}
if (errno != EAGAIN)
break;
wait_time(&tval);
}
if (errno != 0)
error("hard failure trying to get memory for a compressor: %m");
return (errno == ENOSR)? 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 cf[2];
cf[0] = (isopen? CCP_ISOPEN: 0) + (isup? CCP_ISUP: 0);
cf[1] = CCP_ISOPEN | CCP_ISUP | CCP_ERROR | CCP_FATALERROR;
if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
if (!hungup || errno != ENXIO)
error("Couldn't set kernel CCP state: %m");
}
}
/*
* get_idle_time - return how long the link has been idle.
*/
int
get_idle_time(u, ip)
int u;
struct ppp_idle *ip;
{
return strioctl(pppfd, PPPIO_GIDLE, ip, 0, sizeof(struct ppp_idle)) >= 0;
}
/*
* get_ppp_stats - return statistics for the link.
*/
int
get_ppp_stats(u, stats)
int u;
struct pppd_stats *stats;
{
struct ppp_stats s;
if (strioctl(pppfd, PPPIO_GETSTAT, &s, 0, sizeof(s)) < 0) {
error("Couldn't get link statistics: %m");
return 0;
}
stats->bytes_in = s.p.ppp_ibytes;
stats->bytes_out = s.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(unit)
int unit;
{
int cf[2];
cf[0] = cf[1] = 0;
if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
if (errno != ENXIO && errno != EINVAL)
error("Couldn't get compression flags: %m");
return 0;
}
return cf[0] & CCP_FATALERROR;
}
/*
* sifvjcomp - config tcp header compression
*/
int
sifvjcomp(u, vjcomp, xcidcomp, xmaxcid)
int u, vjcomp, xcidcomp, xmaxcid;
{
int cf[2];
char maxcid[2];
if (vjcomp) {
maxcid[0] = xcidcomp;
maxcid[1] = 15; /* XXX should be rmaxcid */
if (strioctl(pppfd, PPPIO_VJINIT, maxcid, sizeof(maxcid), 0) < 0) {
error("Couldn't initialize VJ compression: %m");
}
}
cf[0] = (vjcomp? COMP_VJC + DECOMP_VJC: 0) /* XXX this is wrong */
+ (xcidcomp? COMP_VJCCID + DECOMP_VJCCID: 0);
cf[1] = COMP_VJC + DECOMP_VJC + COMP_VJCCID + DECOMP_VJCCID;
if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof(cf), sizeof(int)) < 0) {
if (vjcomp)
error("Couldn't enable VJ compression: %m");
}
return 1;
}
/*
* sifup - Config the interface up and enable IP packets to pass.
*/
int
sifup(u)
int u;
{
struct ifreq ifr;
strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
error("Couldn't mark interface up (get): %m");
return 0;
}
ifr.ifr_flags |= IFF_UP;
if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
error("Couldn't mark interface up (set): %m");
return 0;
}
if_is_up = 1;
return 1;
}
/*
* sifdown - Config the interface down and disable IP.
*/
int
sifdown(u)
int u;
{
struct ifreq ifr;
strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
error("Couldn't mark interface down (get): %m");
return 0;
}
if ((ifr.ifr_flags & IFF_UP) != 0) {
ifr.ifr_flags &= ~IFF_UP;
if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
error("Couldn't mark interface down (set): %m");
return 0;
}
}
if_is_up = 0;
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;
{
int npi[2];
npi[0] = proto;
npi[1] = (int) mode;
if (strioctl(pppfd, PPPIO_NPMODE, npi, 2 * sizeof(int), 0) < 0) {
error("ioctl(set NP %d mode to %d): %m", proto, mode);
return 0;
}
return 1;
}
#define INET_ADDR(x) (((struct sockaddr_in *) &(x))->sin_addr.s_addr)
/*
* SET_SA_FAMILY - initialize a struct sockaddr, setting the sa_family field.
*/
#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 ifreq ifr;
struct ifaliasreq addreq;
int ret;
ret = 1;
/* flush old address, if any
*/
bzero(&ifr, sizeof (ifr));
strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o;
if ((ioctl(sockfd, (int)SIOCDIFADDR, (caddr_t) &ifr) < 0)
&& errno != EADDRNOTAVAIL) {
error("ioctl(SIOCDIFADDR): %m");
ret = 0;
}
bzero(&addreq, sizeof (addreq));
strlcpy(addreq.ifra_name, ifname, sizeof (addreq.ifra_name));
SET_SA_FAMILY(addreq.ifra_addr, AF_INET);
SET_SA_FAMILY(addreq.ifra_broadaddr, AF_INET);
((struct sockaddr_in *)&addreq.ifra_addr)->sin_addr.s_addr = o;
((struct sockaddr_in *)&addreq.ifra_broadaddr)->sin_addr.s_addr = h;
if (m != 0) {
((struct sockaddr_in *)&addreq.ifra_mask)->sin_addr.s_addr = m;
addreq.ifra_mask.sa_len = sizeof (struct sockaddr);
info("Setting interface mask to %s\n", ip_ntoa(m));
}
/* install new src/dst and (possibly) netmask
*/
if (ioctl(sockfd, SIOCPIFADDR, &addreq) < 0) {
error("ioctl(SIOCPIFADDR): %m");
ret = 0;
}
ifr.ifr_metric = link_mtu;
if (ioctl(sockfd, SIOCSIPMTU, &ifr) < 0) {
error("Couldn't set IP MTU: %m");
ret = 0;
}
ifaddrs[0] = o;
ifaddrs[1] = h;
return (ret);
}
/*
* 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 ifreq ifr;
ifaddrs[0] = 0;
ifaddrs[1] = 0;
bzero(&ifr, sizeof (ifr));
strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o;
if (ioctl(sockfd, (int)SIOCDIFADDR, (caddr_t) &ifr) < 0) {
error("ioctl(SIOCDIFADDR): %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;
{
struct ortentry rt;
BZERO(&rt, 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 = g;
rt.rt_flags = RTF_GATEWAY;
if (ioctl(sockfd, (int)SIOCADDRT, &rt) < 0) {
error("default route ioctl(SIOCADDRT): %m");
return 0;
}
default_route_gateway = g;
return 1;
}
/*
* cifdefaultroute - delete a default route through the address given.
*/
int
cifdefaultroute(u, l, g)
int u;
u_int32_t l, g;
{
struct ortentry rt;
BZERO(&rt, 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 = g;
rt.rt_flags = RTF_GATEWAY;
if (ioctl(sockfd, (int)SIOCDELRT, &rt) < 0) {
error("default route ioctl(SIOCDELRT): %m");
return 0;
}
default_route_gateway = 0;
return 1;
}
/*
* sifproxyarp - Make a proxy ARP entry for the peer.
*/
int
sifproxyarp(unit, hisaddr)
int unit;
u_int32_t hisaddr;
{
struct arpreq arpreq;
BZERO(&arpreq, sizeof(arpreq));
/*
* Get the hardware address of an interface on the same subnet
* as our local address.
*/
if (!get_ether_addr(hisaddr, &arpreq.arp_ha)) {
warn("Cannot determine ethernet address for proxy ARP");
return 0;
}
SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
arpreq.arp_flags = ATF_PERM | ATF_PUBL;
if (ioctl(sockfd, (int)SIOCSARP, (caddr_t)&arpreq) < 0) {
error("ioctl(SIOCSARP): %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, (int)SIOCDARP, (caddr_t)&arpreq) < 0) {
error("ioctl(SIOCDARP): %m");
return 0;
}
proxy_arp_addr = 0;
return 1;
}
/*
* 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 *hwaddr;
{
struct ifreq *ifr, *ifend;
u_int32_t ina, mask;
struct ifreq ifreq;
struct ifconf ifc;
struct ifreq ifs[MAX_IFS];
struct ifdevea ifdevreq;
ifc.ifc_len = sizeof(ifs);
ifc.ifc_req = ifs;
if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
error("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++) {
if (ifr->ifr_addr.sa_family == AF_INET) {
/*
* Check that the interface is up, and not point-to-point
* or loopback.
*/
strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
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;
ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
if ((ipaddr & mask) != (ina & mask))
continue;
break;
} else {
if (ifr->ifr_addr.sa_len > sizeof (ifr->ifr_addr))
ifr = (struct ifreq *)((caddr_t)ifr + (ifr->ifr_addr.sa_len - sizeof (ifr->ifr_addr)));
}
}
if (ifr >= ifend)
return 0;
info("found interface %s for proxy arp", ifr->ifr_name);
strlcpy(ifdevreq.ifr_name, ifr->ifr_name, sizeof(ifdevreq.ifr_name));
if (ioctl(sockfd, (int)SIOCRPHYSADDR, &ifdevreq) < 0) {
perror("ioctl(SIOCRPHYSADDR)");
return(0);
}
hwaddr->sa_family = AF_UNSPEC;
memcpy(hwaddr->sa_data, ifdevreq.current_pa, sizeof(ifdevreq.current_pa));
return 1;
}
#define WTMPFILE "/usr/adm/wtmp"
void
logwtmp(line, name, host)
const char *line, *name, *host;
{
int fd;
struct stat buf;
struct utmp ut;
if ((fd = open(WTMPFILE, O_WRONLY|O_APPEND, 0)) < 0)
return;
if (!fstat(fd, &buf)) {
strncpy(ut.ut_line, line, sizeof(ut.ut_line));
strncpy(ut.ut_name, name, sizeof(ut.ut_name));
strncpy(ut.ut_host, host, sizeof(ut.ut_host));
(void)time(&ut.ut_time);
if (write(fd, (char *)&ut, sizeof(struct utmp)) != sizeof(struct utmp))
(void)ftruncate(fd, buf.st_size);
}
close(fd);
}
/*
* 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;
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 = MAX_IFS * sizeof(struct ifreq);
ifc.ifc_req = (struct ifreq *)alloca(ifc.ifc_len);
if (ifc.ifc_req == 0)
return mask;
if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
warn("Couldn't get system interface list: %m");
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) {
ina = INET_ADDR(ifr->ifr_addr);
if ((ntohl(ina) & nmask) != (addr & nmask))
continue;
/*
* Check that the interface is up, and not point-to-point or loopback.
*/
strlcpy(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 |= INET_ADDR(ifreq.ifr_addr);
break;
} else {
if (ifr->ifr_addr.sa_len > sizeof (ifr->ifr_addr))
ifr = (struct ifreq *)((caddr_t)ifr + (ifr->ifr_addr.sa_len - sizeof (ifr->ifr_addr)));
}
}
return mask;
}
/*
* have_route_to - determine if the system has any route to
* a given IP address. `addr' is in network byte order.
* For demand mode to work properly, we have to ignore routes
* through our own interface.
*/
int have_route_to(u_int32_t addr)
{
char buf[sizeof(struct rt_msghdr) + (sizeof(struct sockaddr_in))];
int status;
int s, n;
struct rt_msghdr *rtm;
struct sockaddr_in *sin;
int msglen = sizeof(*rtm) + (sizeof(*sin));
char *cp;
char msg[2048];
rtm = (struct rt_msghdr *)buf;
memset(rtm, 0, msglen);
rtm->rtm_msglen = msglen;
rtm->rtm_version = RTM_VERSION;
rtm->rtm_type = RTM_GET;
rtm->rtm_addrs = RTA_DST;
/* rtm->rtm_addrs, rtm_flags should be set on output */
sin = (struct sockaddr_in *)((u_char *)rtm + sizeof(*rtm));
sin->sin_len = sizeof(*sin);
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = addr;
status = 0;
if ((s = socket(PF_ROUTE, SOCK_RAW, 0)) < 0)
return -1;
if (write(s, (char *)rtm, msglen) != msglen) {
close(s);
return status == ESRCH? 0: -1;
}
n = read(s, msg, 2048);
close(s);
if (n <= 0)
return -1;
rtm = (struct rt_msghdr *) msg;
if (rtm->rtm_version != RTM_VERSION)
return -1;
/* here we try to work out if the route is through our own interface */
cp = (char *)(rtm + 1);
if (rtm->rtm_addrs & RTA_DST) {
struct sockaddr *sa = (struct sockaddr *) cp;
cp = (char *)(((unsigned long)cp + sa->sa_len
+ sizeof(long) - 1) & ~(sizeof(long) - 1));
}
if (rtm->rtm_addrs & RTA_GATEWAY) {
sin = (struct sockaddr_in *) cp;
if (sin->sin_addr.s_addr == ifaddrs[0]
|| sin->sin_addr.s_addr == ifaddrs[1])
return 0; /* route is through our interface */
}
return 1;
}
static int
strioctl(fd, cmd, ptr, ilen, olen)
int fd, cmd, ilen, olen;
void *ptr;
{
struct strioctl str;
str.ic_cmd = cmd;
str.ic_timout = 0;
str.ic_len = ilen;
str.ic_dp = ptr;
if (ioctl(fd, I_STR, &str) == -1)
return -1;
if (str.ic_len != olen)
dbglog("strioctl: expected %d bytes, got %d for cmd %x\n",
olen, str.ic_len, cmd);
return 0;
}
/*
* Use the hostid as part of the random number seed.
*/
int
get_host_seed()
{
return gethostid();
}
/*
* 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.
*/
int
get_pty(master_fdp, slave_fdp, slave_name, uid)
int *master_fdp;
int *slave_fdp;
char *slave_name;
int uid;
{
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);
}
}
if (sfd < 0)
return 0;
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");
return 1;
}
#if 0
/*
* Code for locking/unlocking the serial device.
* This code is derived from chat.c.
*/
#if !defined(HDB) && !defined(SUNOS3)
#define HDB 1 /* ascii lock files are the default */
#endif
#ifndef LOCK_DIR
# if HDB
# define PIDSTRING
# define LOCK_PREFIX "/usr/spool/locks/LCK.."
# else /* HDB */
# define LOCK_PREFIX "/usr/spool/uucp/LCK.."
# endif /* HDB */
#endif /* LOCK_DIR */
static char *lock_file; /* name of lock file created */
/*
* lock - create a lock file for the named device.
*/
int
lock(dev)
char *dev;
{
char hdb_lock_buffer[12];
int fd, pid, n;
char *p;
size_t l;
if ((p = strrchr(dev, '/')) != NULL)
dev = p + 1;
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);
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 */
#ifdef PIDSTRING
n = read(fd, hdb_lock_buffer, 11);
if (n > 0) {
hdb_lock_buffer[n] = 0;
pid = atoi(hdb_lock_buffer);
}
#else
n = read(fd, &pid, sizeof(pid));
#endif
if (n <= 0) {
error("Can't read pid from lock file %s", lock_file);
close(fd);
} else {
if (kill(pid, 0) == -1 && errno == ESRCH) {
/* pid no longer exists - remove the lock file */
if (unlink(lock_file) == 0) {
close(fd);
notice("Removed stale lock on %s (pid %d)",
dev, pid);
continue;
} else
warn("Couldn't remove stale lock on %s",
dev);
} else
notice("Device %s is locked by pid %d",
dev, pid);
}
close(fd);
} else
error("Can't create lock file %s: %m", lock_file);
free(lock_file);
lock_file = NULL;
return -1;
}
#ifdef PIDSTRING
slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%10d\n", getpid());
write(fd, hdb_lock_buffer, 11);
#else
pid = getpid();
write(fd, &pid, sizeof pid);
#endif
close(fd);
return 0;
}
/*
* unlock - remove our lockfile
*/
void
unlock()
{
if (lock_file) {
unlink(lock_file);
free(lock_file);
lock_file = NULL;
}
}
#endif
int
set_filters(pass, active)
struct bpf_program *pass, *active;
{
return 1;
}
int
bpf_compile(program, buf, optimize)
struct bpf_program *program;
char *buf;
int optimize;
{
return 0;
}
char *
bpf_geterr()
{
return 0;
}
u_int
bpf_filter(pc, p, wirelen, buflen)
struct bpf_insn *pc;
u_char *p;
u_int wirelen;
u_int buflen;
{
return 0;
}
Reference in New Issue View Git Blame Copy Permalink