void ppp_recv_config (int unit,int mru,u_int32_t asyncmap,int pcomp,int accomp)
{
u_int x;
MAINDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
/*
* If we were called because the link has gone down then there is nothing
* which may be done. Just return without incident.
*/
if (!still_ppp())
{
return;
}
/*
* Set the receiver parameters
*/
if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
{
syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
}
MAINDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0)
{
syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
quit();
}
x = get_flags();
x = accomp ? x & ~SC_REJ_COMP_AC : x | SC_REJ_COMP_AC;
set_flags (x);
}
/*
* timeout - Schedule a timeout.
*
* Note that this timeout takes the number of seconds, NOT hz (as in
* the kernel).
*/
void
ppptimeout(
void (*func)(void *),
void *arg,
int time)
{
struct callout *newp, *p, **pp;
MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time));
/*
* Allocate timeout.
*/
if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
fatal("Out of memory in timeout()!");
newp->c_arg = arg;
newp->c_func = func;
gettimeofday(&timenow, NULL);
newp->c_time.tv_sec = timenow.tv_sec + time;
newp->c_time.tv_usec = timenow.tv_usec;
/*
* Find correct place and link it in.
*/
for (pp = &callout; (p = *pp); pp = &p->c_next)
if (newp->c_time.tv_sec < p->c_time.tv_sec
|| (newp->c_time.tv_sec == p->c_time.tv_sec
&& newp->c_time.tv_usec < p->c_time.tv_usec))
break;
newp->c_next = p;
*pp = newp;
}
/*
* timeout - Schedule a timeout.
*
* Note that this timeout takes the number of seconds, NOT hz (as in
* the kernel).
*/
void
timeout(void (*func)(void *), void *arg, int time)
{
struct callout *newp, *p, **pp;
MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
(long) func, (long) arg, time));
/*
* Allocate timeout.
*/
if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
syslog(LOG_ERR, "Out of memory in timeout()!");
die(1);
}
newp->c_arg = arg;
newp->c_func = func;
gettimeofday(&timenow, NULL);
newp->c_time.tv_sec = timenow.tv_sec + time;
newp->c_time.tv_usec = timenow.tv_usec;
/*
* Find correct place and link it in.
*/
for (pp = &callout; (p = *pp); pp = &p->c_next)
if (newp->c_time.tv_sec < p->c_time.tv_sec
|| (newp->c_time.tv_sec == p->c_time.tv_sec
&& newp->c_time.tv_usec < p->c_time.tv_sec))
break;
newp->c_next = p;
*pp = newp;
}
/*
* run-program - execute a program with given arguments,
* but don't wait for it.
* If the program can't be executed, logs an error unless
* must_exist is 0 and the program file doesn't exist.
*/
int
run_program(char *prog, char **args, int must_exist)
{
int pid;
pid = fork();
if (pid == -1) {
syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
return -1;
}
if (pid == 0) {
int new_fd;
/* Leave the current location */
setsid(); /* No controlling tty. */
umask (S_IRWXG|S_IRWXO);
chdir ("/"); /* no current directory. */
setuid(geteuid());
setgid(getegid());
/* Ensure that nothing of our device environment is inherited. */
sys_close();
closelog();
close (0);
close (1);
close (2);
close (ttyfd); /* tty interface to the ppp device */
/* Don't pass handles to the PPP device, even by accident. */
new_fd = open (_PATH_DEVNULL, O_RDWR);
if (new_fd >= 0) {
if (new_fd != 0) {
dup2 (new_fd, 0); /* stdin <- /dev/null */
close (new_fd);
}
dup2 (0, 1); /* stdout -> /dev/null */
dup2 (0, 2); /* stderr -> /dev/null */
}
#ifdef BSD
/* Force the priority back to zero if pppd is running higher. */
if (setpriority (PRIO_PROCESS, 0, 0) < 0)
syslog (LOG_WARNING, "can't reset priority to 0: %m");
#endif
/* SysV recommends a second fork at this point. */
/* run the program; give it a null environment */
execve(prog, args, script_env);
if (must_exist || errno != ENOENT)
syslog(LOG_WARNING, "Can't execute %s: %m", prog);
_exit(-1);
}
MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
++n_children;
return 0;
}
static void set_flags (int flags)
{
MAINDEBUG ((LOG_DEBUG, "set flags = %x\n", flags));
if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
{
syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS, %x): %m", flags);
quit();
}
}
void ppp_set_xaccm (int unit, ext_accm accm)
{
MAINDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
accm[0], accm[1], accm[2], accm[3]));
if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
{
syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
}
}
void note_debug_level (void)
{
if (debug)
{
MAINDEBUG ((LOG_INFO, "Debug turned ON, Level %d", debug));
setlogmask(LOG_UPTO(LOG_DEBUG));
}
else
{
setlogmask(LOG_UPTO(LOG_WARNING));
}
}
static int get_flags (void)
{
int flags;
if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0)
{
syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
quit();
}
MAINDEBUG ((LOG_DEBUG, "get flags = %x\n", flags));
return flags;
}
void ppp_send_config (int unit,int mtu,u_int32_t asyncmap,int pcomp,int accomp)
{
u_int x;
struct ifreq ifr;
MAINDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
/*
* Ensure that the link is still up.
*/
if (still_ppp())
{
/*
* Set the MTU and other parameters for the ppp device
*/
memset (&ifr, '\0', sizeof (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();
}
MAINDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0)
{
syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
quit();
}
x = get_flags();
x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
set_flags(x);
}
}
/*
* untimeout - Unschedule a timeout.
*/
void
untimeout(void (*func)(void *), void *arg)
{
struct callout **copp, *freep;
MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
/*
* Find first matching timeout and remove it from the list.
*/
for (copp = &callout; (freep = *copp); copp = &freep->c_next)
if (freep->c_func == func && freep->c_arg == arg) {
*copp = freep->c_next;
free((char *) freep);
break;
}
}
void output (int unit, unsigned char *p, int len)
{
if (unit != 0)
{
MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
}
if (debug)
{
log_packet(p, len, "sent ");
}
if (write(fd, p, len) < 0)
{
syslog(LOG_ERR, "write: %m");
die(1);
}
}
int set_kdebugflag (int requested_level)
{
if (ioctl(fd, PPPIOCGDEBUG, &prev_kdebugflag) < 0)
{
syslog(LOG_ERR, "ioctl(PPPIOCGDEBUG): %m");
return (0);
}
if (prev_kdebugflag != requested_level)
{
if (ioctl(fd, PPPIOCSDEBUG, &requested_level) < 0)
{
syslog (LOG_ERR, "ioctl(PPPIOCSDEBUG): %m");
return (0);
}
MAINDEBUG ((LOG_INFO, "set kernel debugging level to %d",
requested_level));
}
return (1);
}
void establish_ppp (void)
{
int pppdisc = N_PPP;
int sig = SIGIO;
if (ioctl(fd, TIOCEXCL, 0) < 0)
{
syslog (LOG_WARNING, "ioctl(TIOCEXCL): %m");
}
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 (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0)
{
syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
die (1);
}
set_kdebugflag (kdebugflag);
set_flags (get_flags() & ~(SC_RCV_B7_0 | SC_RCV_B7_1 |
SC_RCV_EVNP | SC_RCV_ODDP));
MAINDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver",
driver_version, driver_modification, driver_patch));
}
/*
* get_input - called when incoming data is available.
*/
static void
get_input(void)
{
int len, i;
u_char *p;
u_short protocol;
struct protent *protp;
p = inpacket_buf; /* point to beginning of packet buffer */
len = read_packet(inpacket_buf);
if (len < 0)
return;
if (len == 0) {
etime = time(NULL);
minutes = (etime-stime)/60;
syslog(LOG_NOTICE, "Modem hangup, connected for %d minutes", (minutes >1) ? minutes : 1);
hungup = 1;
lcp_lowerdown(0); /* serial link is no longer available */
link_terminated(0);
return;
}
if (debug /*&& (debugflags & DBG_INPACKET)*/)
log_packet(p, len, "rcvd ", LOG_DEBUG);
if (len < PPP_HDRLEN) {
MAINDEBUG((LOG_INFO, "io(): Received short packet."));
return;
}
p += 2; /* Skip address and control */
GETSHORT(protocol, p);
len -= PPP_HDRLEN;
/*
* Toss all non-LCP packets unless LCP is OPEN.
*/
if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
MAINDEBUG((LOG_INFO,
"get_input: Received non-LCP packet when LCP not open."));
return;
}
/*
* Until we get past the authentication phase, toss all packets
* except LCP, LQR and authentication packets.
*/
if (phase <= PHASE_AUTHENTICATE
&& !(protocol == PPP_LCP || protocol == PPP_LQR
|| protocol == PPP_PAP || protocol == PPP_CHAP)) {
MAINDEBUG((LOG_INFO, "get_input: discarding proto 0x%x in phase %d",
protocol, phase));
return;
}
/*
* Upcall the proper protocol input routine.
*/
for (i = 0; (protp = protocols[i]) != NULL; ++i) {
if (protp->protocol == protocol && protp->enabled_flag) {
(*protp->input)(0, p, len);
return;
}
if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
&& protp->datainput != NULL) {
(*protp->datainput)(0, p, len);
return;
}
}
if (debug)
syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol);
lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
}
int
main(int argc, char *argv[])
{
int i, n, fdflags;
struct sigaction sa;
FILE *iffile;
char *p;
struct passwd *pw;
struct timeval timo;
sigset_t mask;
struct protent *protp;
struct stat statbuf;
int connect_attempts = 0;
char numbuf[16];
phase = PHASE_INITIALIZE;
p = ttyname(0);
if (p)
strcpy(devnam, p);
strcpy(default_devnam, devnam);
script_env = NULL;
/* Initialize syslog facilities */
#ifdef ULTRIX
openlog("pppd", LOG_PID);
#else
openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
setlogmask(LOG_UPTO(LOG_INFO));
#endif
if (gethostname(hostname, MAXNAMELEN) < 0 ) {
option_error("Couldn't get hostname: %m");
die(1);
}
hostname[MAXNAMELEN-1] = 0;
uid = getuid();
privileged = uid == 0;
sprintf(numbuf, "%d", uid);
script_setenv("UID", numbuf);
/*
* Initialize to the standard option set, then parse, in order,
* the system options file, the user's options file,
* the tty's options file, and the command line arguments.
*/
for (i = 0; (protp = protocols[i]) != NULL; ++i)
(*protp->init)(0);
progname = *argv;
if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
|| !options_from_user())
exit(1);
scan_args(argc-1, argv+1); /* look for tty name on command line */
if (!options_for_tty()
|| !parse_args(argc-1, argv+1))
exit(1);
/*
* Check that we are running as root.
*/
if (geteuid() != 0) {
option_error("must be root to run %s, since it is not setuid-root",
argv[0]);
die(1);
}
if (!ppp_available()) {
option_error(no_ppp_msg);
exit(1);
}
/*
* Check that the options given are valid and consistent.
*/
sys_check_options();
auth_check_options();
for (i = 0; (protp = protocols[i]) != NULL; ++i)
if (protp->check_options != NULL)
(*protp->check_options)();
if (demand && connector == 0) {
option_error("connect script required for demand-dialling\n");
exit(1);
}
script_setenv("DEVICE", devnam);
sprintf(numbuf, "%d", baud_rate);
script_setenv("SPEED", numbuf);
/*
* If the user has specified the default device name explicitly,
* pretend they hadn't.
*/
if (!default_device && strcmp(devnam, default_devnam) == 0)
default_device = 1;
if (default_device)
nodetach = 1;
/*
* Initialize system-dependent stuff and magic number package.
*/
sys_init();
magic_init();
if (debug)
setlogmask(LOG_UPTO(LOG_DEBUG));
/*
* Detach ourselves from the terminal, if required,
* and identify who is running us.
*/
if (nodetach == 0)
detach();
pid = getpid();
p = getlogin();
stime = time(NULL);
if (p == NULL) {
pw = getpwuid(uid);
if (pw != NULL && pw->pw_name != NULL)
p = pw->pw_name;
else
p = "(unknown)";
}
syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
/*
* Compute mask of all interesting signals and install signal handlers
* for each. Only one signal handler may be active at a time. Therefore,
* all other signals should be masked when any handler is executing.
*/
sigemptyset(&mask);
sigaddset(&mask, SIGHUP);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGTERM);
sigaddset(&mask, SIGCHLD);
#define SIGNAL(s, handler) { \
sa.sa_handler = handler; \
if (sigaction(s, &sa, NULL) < 0) { \
syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
die(1); \
} \
}
sa.sa_mask = mask;
sa.sa_flags = 0;
SIGNAL(SIGHUP, hup); /* Hangup */
SIGNAL(SIGINT, term); /* Interrupt */
SIGNAL(SIGTERM, term); /* Terminate */
SIGNAL(SIGCHLD, chld);
SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
/*
* Install a handler for other signals which would otherwise
* cause pppd to exit without cleaning up.
*/
SIGNAL(SIGABRT, bad_signal);
SIGNAL(SIGALRM, bad_signal);
SIGNAL(SIGFPE, bad_signal);
SIGNAL(SIGILL, bad_signal);
SIGNAL(SIGPIPE, bad_signal);
SIGNAL(SIGQUIT, bad_signal);
SIGNAL(SIGSEGV, bad_signal);
#ifdef SIGBUS
SIGNAL(SIGBUS, bad_signal);
#endif
#ifdef SIGEMT
SIGNAL(SIGEMT, bad_signal);
#endif
#ifdef SIGPOLL
SIGNAL(SIGPOLL, bad_signal);
#endif
#ifdef SIGPROF
SIGNAL(SIGPROF, bad_signal);
#endif
#ifdef SIGSYS
SIGNAL(SIGSYS, bad_signal);
#endif
#ifdef SIGTRAP
SIGNAL(SIGTRAP, bad_signal);
#endif
#ifdef SIGVTALRM
SIGNAL(SIGVTALRM, bad_signal);
#endif
#ifdef SIGXCPU
SIGNAL(SIGXCPU, bad_signal);
#endif
#ifdef SIGXFSZ
SIGNAL(SIGXFSZ, bad_signal);
#endif
/*
* Apparently we can get a SIGPIPE when we call syslog, if
* syslogd has died and been restarted. Ignoring it seems
* be sufficient.
*/
signal(SIGPIPE, SIG_IGN);
/*
* If we're doing dial-on-demand, set up the interface now.
*/
if (demand) {
/*
* Open the loopback channel and set it up to be the ppp interface.
*/
open_ppp_loopback();
syslog(LOG_INFO, "Using interface ppp%d", ifunit);
sprintf(ifname, "ppp%d", ifunit);
script_setenv("IFNAME", ifname);
create_pidfile(); /* write pid to file */
/*
* Configure the interface and mark it up, etc.
*/
demand_conf();
}
for (;;) {
need_holdoff = 1;
if (demand) {
/*
* Don't do anything until we see some activity.
*/
phase = PHASE_DORMANT;
kill_link = 0;
demand_unblock();
for (;;) {
wait_loop_output(timeleft(&timo));
calltimeout();
if (kill_link) {
if (!persist)
die(0);
kill_link = 0;
}
if (get_loop_output())
break;
reap_kids();
}
/*
* Now we want to bring up the link.
*/
demand_block();
syslog(LOG_INFO, "Starting link");
}
/*
* Lock the device if we've been asked to.
*/
if (lockflag && !default_device) {
if (lock(devnam) < 0)
goto fail;
locked = 1;
}
/*
* Open the serial device and set it up to be the ppp interface.
* First we open it in non-blocking mode so we can set the
* various termios flags appropriately. If we aren't dialling
* out and we want to use the modem lines, we reopen it later
* in order to wait for the carrier detect signal from the modem.
*/
while ((ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0)) < 0) {
if (errno != EINTR)
syslog(LOG_ERR, "Failed to open %s: %m", devnam);
if (!persist || errno != EINTR)
goto fail;
}
if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
|| fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
syslog(LOG_WARNING,
"Couldn't reset non-blocking mode on device: %m");
hungup = 0;
kill_link = 0;
/*
* Do the equivalent of `mesg n' to stop broadcast messages.
*/
if (fstat(ttyfd, &statbuf) < 0
|| fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
syslog(LOG_WARNING,
"Couldn't restrict write permissions to %s: %m", devnam);
} else
tty_mode = statbuf.st_mode;
/* run connection script */
if (connector && connector[0]) {
MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
/*
* Set line speed, flow control, etc.
* On most systems we set CLOCAL for now so that we can talk
* to the modem before carrier comes up. But this has the
* side effect that we might miss it if CD drops before we
* get to clear CLOCAL below. On systems where we can talk
* successfully to the modem with CLOCAL clear and CD down,
* we can clear CLOCAL at this point.
*/
set_up_tty(ttyfd, 1);
/* drop dtr to hang up in case modem is off hook */
if (!default_device && modem) {
setdtr(ttyfd, FALSE);
sleep(1);
setdtr(ttyfd, TRUE);
}
if (device_script(connector, ttyfd, ttyfd) < 0) {
syslog(LOG_ERR, "Connect script failed");
setdtr(ttyfd, FALSE);
connect_attempts++;
goto fail;
}
syslog(LOG_INFO, "Serial connection established.");
sleep(1); /* give it time to set up its terminal */
}
connect_attempts = 0; /* we made it through ok */
/* set line speed, flow control, etc.; clear CLOCAL if modem option */
set_up_tty(ttyfd, 0);
/* reopen tty if necessary to wait for carrier */
if (connector == NULL && modem) {
while ((i = open(devnam, O_RDWR)) < 0) {
if (errno != EINTR)
syslog(LOG_ERR, "Failed to reopen %s: %m", devnam);
if (!persist || errno != EINTR ||
hungup || kill_link)
goto fail;
}
close(i);
}
/* run welcome script, if any */
if (welcomer && welcomer[0]) {
if (device_script(welcomer, ttyfd, ttyfd) < 0)
syslog(LOG_WARNING, "Welcome script failed");
}
/* set up the serial device as a ppp interface */
establish_ppp(ttyfd);
if (!demand) {
syslog(LOG_INFO, "Using interface ppp%d", ifunit);
sprintf(ifname, "ppp%d", ifunit);
create_pidfile(); /* write pid to file */
/* write interface unit number to file */
for (n = strlen(devnam); n > 0 ; n--)
if (devnam[n] == '/') {
n++;
break;
}
sprintf(iffilename, "%s%s.if", _PATH_VARRUN, &devnam[n]);
if ((iffile = fopen(iffilename, "w")) != NULL) {
fprintf(iffile, "ppp%d\n", ifunit);
fclose(iffile);
} else {
syslog(LOG_ERR, "Failed to create if file %s: %m", iffilename);
iffilename[0] = 0;
}
script_setenv("IFNAME", ifname);
}
/*
* Start opening the connection and wait for
* incoming events (reply, timeout, etc.).
*/
syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
stime = time(NULL);
lcp_lowerup(0);
lcp_open(0); /* Start protocol */
for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
wait_input(timeleft(&timo));
calltimeout();
get_input();
if (kill_link) {
lcp_close(0, "User request");
kill_link = 0;
}
if (open_ccp_flag) {
if (phase == PHASE_NETWORK) {
ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
(*ccp_protent.open)(0);
}
open_ccp_flag = 0;
}
reap_kids(); /* Don't leave dead kids lying around */
}
/*
* If we may want to bring the link up again, transfer
* the ppp unit back to the loopback. Set the
* real serial device back to its normal mode of operation.
*/
clean_check();
if (demand)
restore_loop();
disestablish_ppp(ttyfd);
/*
* Run disconnector script, if requested.
* XXX we may not be able to do this if the line has hung up!
*/
if (disconnector && !hungup) {
set_up_tty(ttyfd, 1);
if (device_script(disconnector, ttyfd, ttyfd) < 0) {
syslog(LOG_WARNING, "disconnect script failed");
} else {
syslog(LOG_INFO, "Serial link disconnected.");
}
}
fail:
if (ttyfd >= 0)
close_tty();
if (locked) {
unlock();
locked = 0;
}
if (!demand) {
if (pidfilename[0] != 0
&& unlink(pidfilename) < 0 && errno != ENOENT)
syslog(LOG_WARNING, "unable to delete pid file: %m");
pidfilename[0] = 0;
if (iffile)
if (unlink(iffilename) < 0 && errno != ENOENT)
syslog(LOG_WARNING, "unable to delete if file: %m");
iffilename[0] = 0;
}
/* limit to retries? */
if (max_con_attempts)
if (connect_attempts >= max_con_attempts)
break;
if (!persist)
die(1);
if (demand)
demand_discard();
if (holdoff > 0 && need_holdoff) {
phase = PHASE_HOLDOFF;
TIMEOUT(holdoff_end, NULL, holdoff);
do {
wait_time(timeleft(&timo));
calltimeout();
if (kill_link) {
if (!persist)
die(0);
kill_link = 0;
phase = PHASE_DORMANT; /* allow signal to end holdoff */
}
reap_kids();
} while (phase == PHASE_HOLDOFF);
}
}
die(0);
return 0;
}
/*
* get_input - called when incoming data is available.
*/
static void
get_input(void)
{
int len, i;
u_char *p;
u_short protocol;
struct protent *protp;
p = inpacket_buf; /* point to beginning of packet buffer */
len = read_packet(inpacket_buf);
if (len < 0)
return;
if (len == 0) {
notice("Modem hangup");
hungup = 1;
pppd_status = EXIT_HANGUP;
lcp_lowerdown(0); /* serial link is no longer available */
link_terminated(0);
return;
}
if (debug /*&& (debugflags & DBG_INPACKET)*/)
dbglog("rcvd %P", p, len);
if (len < PPP_HDRLEN) {
MAINDEBUG(("io(): Received short packet."));
return;
}
p += 2; /* Skip address and control */
GETSHORT(protocol, p);
len -= PPP_HDRLEN;
/*
* Toss all non-LCP packets unless LCP is OPEN.
*/
if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
return;
}
/*
* Until we get past the authentication phase, toss all packets
* except LCP, LQR and authentication packets.
*/
if (pppd_phase <= PHASE_AUTHENTICATE
&& !(protocol == PPP_LCP || protocol == PPP_LQR
|| protocol == PPP_PAP || protocol == PPP_CHAP)) {
MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
protocol, pppd_phase));
return;
}
/*
* Upcall the proper protocol input routine.
*/
for (i = 0; (protp = protocols[i]) != NULL; ++i) {
if (protp->protocol == protocol && protp->enabled_flag) {
(*protp->input)(0, p, len);
return;
}
if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
&& protp->datainput != NULL) {
(*protp->datainput)(0, p, len);
return;
}
}
if (debug) {
const char *pname = protocol_name(protocol);
if (pname != NULL)
warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
else
warn("Unsupported protocol 0x%x received", protocol);
}
lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
return;
}
static int local_get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr,
char *name, struct ifreq *ifs, int ifs_len)
{
struct ifreq *ifr, *ifend, *ifp;
int i;
u_int32_t ina, mask;
struct sockaddr_dl *dla;
struct ifreq ifreq;
struct ifconf ifc;
/*
* Request the total list of all devices configured on your system.
*/
ifc.ifc_len = ifs_len;
ifc.ifc_req = ifs;
if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)
{
syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
return 0;
}
MAINDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
/*
* Scan through looking for an interface with an Internet
* address on the same subnet as `ipaddr'.
*/
ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
for (ifr = ifc.ifc_req; ifr < ifend; ifr++)
{
if (ifr->ifr_addr.sa_family == AF_INET)
{
ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
MAINDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
ifreq.ifr_name));
/*
* Check that the interface is up, and not point-to-point
* nor loopback.
*/
if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
{
continue;
}
if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
{
continue;
}
/*
* Get its netmask and check that it's on the right subnet.
*/
if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
{
continue;
}
mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
MAINDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
ip_ntoa(ina), ntohl(mask)));
if (((ipaddr ^ ina) & mask) != 0)
{
continue;
}
break;
}
}
if (ifr >= ifend)
{
return 0;
}
memcpy (name, ifreq.ifr_name, sizeof(ifreq.ifr_name));
syslog(LOG_INFO, "found interface %s for proxy arp", name);
/*
* Now get the hardware address.
*/
memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
if (ioctl (sockfd, SIOCGIFHWADDR, &ifreq) < 0)
{
syslog(LOG_ERR, "SIOCGIFHWADDR(%s): %m", ifreq.ifr_name);
return 0;
}
memcpy (hwaddr,
&ifreq.ifr_hwaddr,
sizeof (struct sockaddr));
MAINDEBUG ((LOG_DEBUG,
"proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
(int) ((unsigned char *) &hwaddr->sa_data)[0],
(int) ((unsigned char *) &hwaddr->sa_data)[1],
(int) ((unsigned char *) &hwaddr->sa_data)[2],
(int) ((unsigned char *) &hwaddr->sa_data)[3],
(int) ((unsigned char *) &hwaddr->sa_data)[4],
(int) ((unsigned char *) &hwaddr->sa_data)[5],
(int) ((unsigned char *) &hwaddr->sa_data)[6],
(int) ((unsigned char *) &hwaddr->sa_data)[7]));
return 1;
}
