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isdn4k-utils/ipppd/main.c

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/*
* main.c - Point-to-Point Protocol main module
*
* Fairly patched version for isdn4linux
* copyright (c) 1995,1996,1997 of all patches by Michael Hipp
* still no warranties (see disclaimer)
*
* Copyright (c) 1989 Carnegie Mellon 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. The name of the
* University 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.
*/
/*
* PATCHLEVEL 9
*/
char main_rcsid[] = "$Id: main.c,v 1.26 2005/08/01 12:15:15 keil Exp $";
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <syslog.h>
#include <netdb.h>
#include <utmp.h>
#include <pwd.h>
#include <unistd.h>
#include <ctype.h>
#include <time.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include </usr/include/net/if.h>
#include "fsm.h"
#include "ipppd.h"
#include "magic.h"
#include "lcp.h"
#include "ipcp.h"
#include "ipxcp.h"
#include "environ.h"
#include "upap.h"
#include "chap.h"
#include "cbcp.h"
#include "ccp.h"
#include "pathnames.h"
#include "patchlevel.h"
#include "protos.h"
extern int readpassw(char *, int);
/*
* If REQ_SYSOPTIONS is defined to 1, pppd will not run unless
* /etc/ppp/ioptions exists.
*/
#ifndef REQ_SYSOPTIONS
#define REQ_SYSOPTIONS 1
#endif
/* interface vars */
extern void make_options_global(int slot);
char pidfilename[MAXPATHLEN]; /* name of pid file */
char *progname; /* Name of this program */
char hostname[MAXNAMELEN]; /* Our hostname */
static pid_t pid; /* Our pid */
static uid_t uid; /* Our real user-id */
struct link_struct lns[NUM_PPP];
int numdev = 0;
int kill_link = 0;
u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
static u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
static int n_children; /* # child processes still running */
int baud_rate;
char *no_ppp_msg = "Sorry - this system lacks PPP kernel support.\n"
"Check whether you configured at least the ippp0 device!\n";
/* prototypes */
static void hup(int);
static void term(int);
static void chld(int);
static void toggle_debug(int);
static void reload_param(int);
static void bad_signal(int);
static void get_input(int);
static void connect_time_expired(caddr_t);
static int init_unit(int);
static int exit_unit(int);
void remote_sys_options __P((void));
void reload_config(void);
extern char *ttyname __P((int));
extern char *getlogin __P((void));
extern int daemon(int,int);
#ifdef ultrix
#undef O_NONBLOCK
#define O_NONBLOCK O_NDELAY
#endif
/*
* PPP Data Link Layer "protocol" table.
* One entry per supported protocol.
* The last entry must be NULL.
*/
struct protent *protocols[] = {
&lcp_protent,
&pap_protent,
&chap_protent,
&cbcp_protent,
&ipcp_protent,
&ccp_protent,
&ccp_link_protent,
&ipxcp_protent,
NULL
};
int main(int argc,char **argv)
{
int i,j,l;
struct sigaction sa;
FILE *pidfile;
struct timeval timo;
sigset_t mask;
struct protent *protp;
char *devnam;
int ppp_ok;
if(argc > 1 && !strcmp(argv[1],"-version")) {
#ifndef RADIUS
fprintf(stderr,"ipppd %s.%d (isdn4linux version of pppd by MH) started\n", VERSION, PATCHLEVEL);
#else
fprintf(stderr,"ipppd %s.%d (isdn4linux version of pppd with RADIUS extension by mla) started\n", VERSION, PATCHLEVEL);
#endif
fprintf(stderr,"%s\n%s\n%s\n%s\n%s\n",lcp_rcsid,ipcp_rcsid,ipxcp_rcsid,ccp_rcsid,magic_rcsid);
fprintf(stderr,"%s\n%s\n%s\n%s\n",chap_rcsid,upap_rcsid,main_rcsid,options_rcsid);
fprintf(stderr,"%s\n%s\n%s\n",fsm_rcsid,cbcp_rcsid,sys_rcsid);
#ifdef USE_MSCHAP
fprintf(stderr,"%s\n",chap_ms_rcsid);
#endif
exit(1);
}
/*
* Initialize magic number package.
*/
magic_init();
for(i=0;i<NUM_PPP;i++) {
lns[i].openfails = 0;
lns[i].initfdflags = -1;
lns[i].hungup = 1;
lns[i].bundle_next = &lns[i];
lns[i].ifname[0] = 0;
lns[i].ifunit = -1;
lns[i].phase = PHASE_WAIT;
lns[i].fd = -1;
lns[i].logged_in = 0;
lns[i].lcp_unit = lns[i].ipcp_unit = lns[i].ccp_unit = -1;
lns[i].cbcp_unit = lns[i].ccp_l_unit = -1;
lns[i].ipxcp_unit = -1;
lns[i].unit = i;
lns[i].chap_unit = lns[i].upap_unit = -1;
lns[i].auth_up_script = 0;
lns[i].attempts = 0;
}
if (gethostname(hostname, MAXNAMELEN) < 0 ) {
perror("couldn't get hostname");
die(1);
}
hostname[MAXNAMELEN-1] = 0;
pidfilename[0] = 0;
uid = getuid();
/*
* Initialize to the standard option set, then parse, in order,
* the system options file, the user's options file, and the command
* line arguments.
*/
progname = *argv;
for (i = 0; (protp = protocols[i]) != NULL; i++)
for(j=0;j<NUM_PPP;j++)
(*protp->init)(j); /* modifies our options .. !!!! */
#ifdef OPTIONS_TTY_FIRST
if (!options_from_file(_PATH_SYSOPTIONS, REQ_SYSOPTIONS, 0, 0 ) ||
!options_for_tty() ||
!parse_args(argc-1, argv+1))
#else
if (!options_from_file(_PATH_SYSOPTIONS, REQ_SYSOPTIONS, 0 , 0) ||
!parse_args(argc-1, argv+1) || !options_for_tty() )
#endif
die(1);
/*
* copy protocol options for unit 0 to all option fields
*/
make_options_global(0);
/* Check each device to find one that supports PPP */
/* The first one might not, if it's a slave device... */
ppp_ok = 0;
for (i = 0; i < NUM_PPP && lns[i].devnam; i++) {
if ((devnam = strrchr(lns[i].devnam, '/')))
devnam++;
else
devnam = lns[i].devnam;
if (ppp_available(devnam)) {
ppp_ok = 1;
break;
}
}
if (!ppp_ok) {
fprintf(stderr, no_ppp_msg);
exit(1);
}
if (ask_passwd) {
l = readpassw(passwd, MAXSECRETLEN);
if (l <= 0) {
fprintf(stderr, "get no password with askpassword\n");
exit(1);
}
} else if (fdpasswd) {
i=1;
l=0;
while(i>0) {
j = read(fdpasswd, &i, 1);
if (j == -1 && (errno == EAGAIN || errno == EINTR))
continue;
if (j!=1)
break;
if (i=='\n')
break;
passwd[l++] = i;
if (l>=MAXSECRETLEN) {
l--;
break;
}
}
if (l <= 0) {
fprintf(stderr, "get no password from fd(%d)\n", fdpasswd);
exit(1);
}
passwd[l] = 0;
}
remove_sys_options();
check_auth_options();
setipdefault();
sys_init(); /* init log stuff and open socket for ioctl commands */
if(!numdev) {
fprintf(stderr,"ipppd: No devices found.\n");
die(1);
}
else {
char devstr[1024], *p, *end;
end = devstr+sizeof(devstr)-1; /* points to last byte in array */
/* p points to next empty byte always */
p = devstr + sprintf(devstr,"Found %d device%s: ",numdev, numdev==1?"":"s");
for(i=0;i<numdev;i++)
{
int len = strlen(lns[i].ifname);
if (p+len+3 > end) {
/* not enough space left for interface name plus ... */
if (p+3 < end) /* enough space for ... */
strcpy(p, "..."); /* indicate truncation */
break;
}
strcpy(p, lns[i].ifname);
p += len;
if (i < numdev - 1) {
strcpy(p,", ");
p += 2;
}
}
syslog(LOG_NOTICE,"%s", devstr);
}
/*
* Detach ourselves from the terminal, if required,
* and identify who is running us.
*/
if (!nodetach) {
int a,f;
f = fork();
if(f < 0) {
perror("Couldn't detach from controlling terminal");
exit(1);
}
if(f)
exit(0);
setsid();
chdir("/");
a = open("/dev/null",O_RDWR);
if(a < 0) {
perror("Couldn't open /dev/null");
exit(1);
}
dup2(a,0);
dup2(a,1);
dup2(a,2);
close(a);
}
pid = getpid();
/* write pid to file */
if(!strlen(pidfilename))
#if 0 /* old style, default is to use same pidfile for all devices */
sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, "ipppd" );
#else /* new style, incorporate device name into pidfile (like mgetty does) */
{
char *p;
if ((p = strrchr(lns[0].devnam, '/')))
p++;
else
p = lns[0].devnam;
snprintf(pidfilename, sizeof(pidfilename), "%s%s.%s.pid", _PATH_VARRUN, "ipppd", p);
}
#endif
if ((pidfile = fopen(pidfilename, "w")) != NULL) {
fprintf(pidfile, "%d\n", pid);
fclose(pidfile);
} else {
syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
pidfilename[0] = 0;
}
syslog(LOG_NOTICE, "ipppd %s.%d (isdn4linux version of pppd by MH) started", VERSION, PATCHLEVEL);
/*
* 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, reload_param); /* reload parameters */
/*
* 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
for(i=0;i<numdev;i++) {
if(lns[i].fd == -1) {
syslog(LOG_NOTICE,"init_unit: %d\n",i);
if(init_unit(i) < 0) {
/* Error */
}
}
}
for(;!kill_link;) {
fd_set ready;
int n,i,max=-1;
FD_ZERO(&ready);
for(i=0;i<numdev;i++)
if(lns[i].fd >= 0) {
if(lns[i].fd > max)
max = lns[i].fd;
FD_SET(lns[i].fd, &ready);
}
n = select(max+1, &ready, NULL, NULL, timeleft(&timo) );
if (n < 0 && errno != EINTR) {
syslog(LOG_ERR, "select: %m");
die(1);
}
calltimeout();
for(i=0;i<numdev && n>0;i++) {
if(lns[i].fd >= 0 && FD_ISSET(lns[i].fd,&ready)) {
/* n--; */
if(lns[i].phase == PHASE_WAIT) {
/* ok, now we (usually) have a unit */
lns[i].hungup = 0;
establish_ppp(i);
if(maxconnect > 0)
timeout(connect_time_expired, (void *)(long)i, maxconnect);
syslog(LOG_NOTICE,"PHASE_WAIT -> PHASE_ESTABLISHED, ifunit: %d, linkunit: %d, fd: %d",lns[i].ifunit,i,lns[i].fd);
lcp_open(lns[i].lcp_unit);
lns[i].phase = PHASE_ESTABLISH;
}
get_input(i);
}
}
reap_kids(); /* Don't leave dead kids lying around */
for(i=0;i<numdev;i++)
if(kill_link || lns[i].phase == PHASE_DEAD) {
if(!kill_link)
syslog(LOG_NOTICE,"taking down PHASE_DEAD link %d, linkunit: %d",i,lns[i].unit);
untimeout(connect_time_expired,(void *) (long)i);
lcp_close(lns[i].lcp_unit,"link closed");
lcp_lowerdown(lns[i].lcp_unit);
lcp_freeunit(lns[i].lcp_unit);
if(debug)
syslog(LOG_NOTICE,"LCP is down");
exit_unit(i);
syslog(LOG_NOTICE,"link %d closed , linkunit: %d",i,lns[i].unit);
lns[i].phase = PHASE_WAIT;
}
if(!kill_link) {
for(i=0;i<numdev;i++)
if(lns[i].fd == -1) {
syslog(LOG_NOTICE,"reinit_unit: %d\n",i);
if(init_unit(i) < 0) { /* protokolle hier neu initialisieren?? */
/* error */
}
}
}
}
if (unlink(pidfilename) < 0 && errno != ENOENT)
syslog(LOG_WARNING, "unable to delete pid file: %m");
pidfilename[0] = 0;
die(0);
return 0; /*NOTREACHED*/
}
/*
* initialize unit
*/
static int init_unit(int linkunit)
{
if ((lns[linkunit].fd = open(lns[linkunit].devnam, O_NONBLOCK | O_RDWR, 0)) < 0) {
if(errno == ENOENT) {
syslog(LOG_ERR, "[%d] Failed to open %s: %m -> Disabling this unit",linkunit,lns[linkunit].devnam);
syslog(LOG_NOTICE, "[%d] Failed to open %s: %m -> Disabling this unit",linkunit,lns[linkunit].devnam);
lns[linkunit].fd = -2;
} else {
syslog(LOG_ERR, "[%d] Failed to open %s: %m",linkunit,lns[linkunit].devnam);
syslog(LOG_NOTICE, "[%d] Failed to open %s: %m",linkunit,lns[linkunit].devnam);
lns[linkunit].fd = -1;
}
/* maybe we should start a timer here to retry the open after a few seconds */
lns[linkunit].openfails++;
if(lns[linkunit].openfails >= 16) {
syslog(LOG_ERR, "Too much open fails on %s: %m", lns[linkunit].devnam);
lns[linkunit].fd = -2;
}
return -1;
}
if ((lns[linkunit].initfdflags = fcntl(lns[linkunit].fd, F_GETFL)) == -1) {
syslog(LOG_ERR, "Couldn't get device fd flags: %m");
lns[linkunit].fd = -2;
return -1;
}
/*
* Set device for non-blocking reads.
*/
if (fcntl(lns[linkunit].fd, F_SETFL, lns[linkunit].initfdflags | O_NONBLOCK) == -1) {
syslog(LOG_ERR, "Couldn't set device to non-blocking mode: %m");
lns[linkunit].fd = -2;
return -1;
}
syslog(LOG_NOTICE, "Connect[%d]: %s, fd: %d",linkunit, lns[linkunit].devnam,lns[linkunit].fd);
set_kdebugflag (kdebugflag,linkunit);
lns[linkunit].openfails = 0;
lns[linkunit].auth_up_script = 0;
lns[linkunit].attempts = 0;
lns[linkunit].hungup = 1;
lns[linkunit].lcp_unit = lcp_getunit(linkunit);
/*
* give the same unit number to chap,upap
*/
lns[linkunit].upap_unit = lns[linkunit].chap_unit = lns[linkunit].lcp_unit;
upap[lns[linkunit].upap_unit].us_unit = chap[lns[linkunit].chap_unit].unit = linkunit;
lcp_lowerup(lns[linkunit].lcp_unit);
#ifdef IPPP_FILTER
set_filters(linkunit, &pass_filter, &active_filter);
#endif /* IPPP_FILTER */
return 0;
}
static int exit_unit(int the_unit)
{
if (lns[the_unit].initfdflags != -1) {
lns[the_unit].initfdflags &= ~O_NONBLOCK;
if(fcntl(lns[the_unit].fd, F_SETFL, lns[the_unit].initfdflags) < 0)
syslog(LOG_ERR,"Failed to set %s back to blocking mode %m",lns[the_unit].devnam);
lns[the_unit].initfdflags = -1;
}
close_fd(the_unit);
return 0;
}
/*
* connect_time_expired - log a message and close the connection.
*/
static void connect_time_expired(caddr_t arg)
{
int linkunit = (int)(long)arg;
syslog(LOG_INFO, "Connect time expired");
lcp_close(linkunit, "Connect time expired"); /* Close connection */
}
char *protocol2name(int p)
{
int top = (sizeof(protonames) / sizeof(struct protos));
int bottom = 0;
int pos = top >> 1;
int step = (pos+1) >> 1;
while(pos < top && pos >= bottom) {
if(protonames[pos].val == p)
return protonames[pos].name;
if(protonames[pos].val > p) {
top = pos;
pos -= step;
step = (step+1)>>1;
}
else {
bottom = pos + 1;
pos += step;
step = (step+1)>>1;
}
}
return NULL;
}
/*
* get_input - called when incoming data is available.
*/
static void get_input(int linkunit)
{
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,linkunit);
if (len < 0)
return;
if (len == 0) {
syslog(LOG_NOTICE, "Modem hangup");
lns[linkunit].hungup = 1;
#if 0
lcp_lowerdown(lns[linkunit].lcp_unit); /* serial link is no longer available */
#endif
link_terminated(linkunit);
return;
}
if (debug)
log_packet(p, len, "rcvd ",linkunit);
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[lns[linkunit].lcp_unit].state != OPENED) {
MAINDEBUG((LOG_INFO,
"io(): Received non-LCP packet when LCP not open."));
return;
}
/*
* Upcall the proper protocol input routine.
*/
for (i = 0; (protp = protocols[i]) != NULL; ++i) {
if (protp->protocol == protocol && protp->enabled_flag) {
(*protp->input)(linkunit, p, len);
return;
}
if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
&& protp->datainput != NULL) {
(*protp->datainput)(linkunit, p, len);
return;
}
}
if (debug) {
char *s;
s = protocol2name(protocol);
if(!s)
syslog(LOG_WARNING, "Unknown protocol (0x%x) received", protocol);
else
syslog(LOG_WARNING, "Unsupported protocol '%s' (0x%x) received", s,protocol);
}
lcp_sprotrej(linkunit, p - PPP_HDRLEN, len + PPP_HDRLEN);
}
/*
* demuxprotrej - Demultiplex a Protocol-Reject.
*/
void demuxprotrej(int linkunit,u_short protocol)
{
int i;
struct protent *protp;
/*
* Upcall the proper Protocol-Reject routine.
*/
for (i = 0; (protp = protocols[i]) != NULL; ++i) {
if (protp->protocol == protocol) {
(*protp->protrej)(linkunit);
return;
}
}
syslog(LOG_WARNING,
"demuxprotrej: Unrecognized Protocol-Reject for protocol 0x%x",
protocol);
}
/*
* bad_signal - We've caught a fatal signal. Clean up state and exit.
*/
static void bad_signal(int sig)
{
syslog(LOG_ERR, "Fatal signal %d", sig);
die(1);
}
/*
* die - like quit, except we can specify an exit status.
*/
void die(int status)
{
int i;
for(i=0;i<numdev;i++)
cleanup(0, NULL,i);
syslog(LOG_INFO, "Exit.");
exit(status);
}
/*
* cleanup - restore anything which needs to be restored before we exit
*/
/* ARGSUSED */
void cleanup(int status,caddr_t arg,int tu)
{
if (lns[tu].fd >= 0)
close_fd(tu);
if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
syslog(LOG_WARNING, "unable to delete pid file: %m");
pidfilename[0] = 0;
#if 0
if (lockflag)
unlock();
#endif
}
/*
* close_fd - restore the terminal device and close it.
*/
void close_fd(int tu)
{
if (lns[tu].initfdflags != -1 && fcntl(lns[tu].fd, F_SETFL, lns[tu].initfdflags) < 0)
syslog(LOG_WARNING, "Couldn't restore device fd flags: %m");
lns[tu].initfdflags = -1;
syslog(LOG_INFO, "closing fd %d from unit %d",lns[tu].fd,tu);
close(lns[tu].fd);
lns[tu].fd = -1;
}
struct callout {
struct timeval c_time; /* time at which to call routine */
caddr_t c_arg; /* argument to routine */
void (*c_func)(); /* routine */
struct callout *c_next;
};
static struct callout *callout = NULL; /* Callout list */
static struct timeval timenow; /* Current time */
/*
* timeout - Schedule a timeout.
*
* Note that this timeout takes the number of seconds, NOT hz (as in
* the kernel).
*/
void timeout(void (*func)(),caddr_t 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;
}
/*
* untimeout - Unschedule a timeout.
*/
void untimeout(void (*func)(),caddr_t 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;
}
}
/*
* calltimeout - Call any timeout routines which are now due.
*/
void calltimeout()
{
struct callout *p;
while (callout != NULL) {
p = callout;
if (gettimeofday(&timenow, NULL) < 0) {
syslog(LOG_ERR, "Failed to get time of day: %m");
die(1);
}
if (!(p->c_time.tv_sec < timenow.tv_sec
|| (p->c_time.tv_sec == timenow.tv_sec
&& p->c_time.tv_usec <= timenow.tv_usec)))
break; /* no, it's not time yet */
callout = p->c_next;
(*p->c_func)(p->c_arg);
free((char *) p);
}
}
/*
* timeleft - return the length of time until the next timeout is due.
*/
struct timeval *
timeleft(tvp)
struct timeval *tvp;
{
if (callout == NULL)
return NULL;
gettimeofday(&timenow, NULL);
tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
if (tvp->tv_usec < 0) {
tvp->tv_usec += 1000000;
tvp->tv_sec -= 1;
}
if (tvp->tv_sec < 0)
tvp->tv_sec = tvp->tv_usec = 0;
return tvp;
}
/*
* hup - Catch SIGHUP signal.
*
* Indicates that the physical layer has been disconnected.
* We don't rely on this indication; if the user has sent this
* signal, we just take the link down.
*/
static void hup(int sig)
{
syslog(LOG_INFO, "Hangup (SIGHUP)");
/* kill_link = 1; */
}
/*
* term - Catch SIGTERM signal and SIGINT signal (^C/del).
*
* Indicates that we should initiate a graceful disconnect and exit.
*/
static void term(int sig)
{
syslog(LOG_INFO, "Terminating on signal %d.", sig);
kill_link = 1;
}
/*
* chld - Catch SIGCHLD signal.
* Calls reap_kids to get status for any dead kids.
*/
static void chld(int sig)
{
reap_kids();
}
/*
* toggle_debug - Catch SIGUSR1 signal.
*
* Toggle debug flag.
*/
static void toggle_debug(int sig)
{
debug = !debug;
note_debug_level();
}
/*
* reload param - Catch SIGUSR2 signal.
*/
static void reload_param(int sig)
{
reload_config();
}
/*
* 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 unit)
{
int pid;
char *nullenv[1];
char **envtouse;
pid = fork();
if (pid < 0) {
syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
return -1;
}
if (pid == 0) {
int i,new_fd;
setsid();
umask (S_IRWXG|S_IRWXO);
chdir ("/");
/* AUD: full root privs? */
setuid(geteuid());
setgid(getegid());
close (0);
close (1);
close (2);
for(i=0;i<NUM_PPP;i++)
if(lns[i].fd >= 0)
close(lns[i].fd);
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 */
}
nullenv[0] = NULL;
if (script_env)
envtouse = script_env;
else
envtouse = nullenv;
execve(prog, args, envtouse);
if (must_exist || errno != ENOENT)
syslog(LOG_WARNING, "Can't execute %s: %m", prog);
exit(99); /* CHILD exit */
}
MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
++n_children;
return 0;
}
/*
* reap_kids - get status from any dead child processes,
* and log a message for abnormal terminations.
*/
void reap_kids()
{
int pid, status;
if (n_children == 0)
return;
if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
if (errno != ECHILD)
syslog(LOG_ERR, "Error waiting for child process: %m");
return;
}
if (pid > 0) {
--n_children;
if (WIFSIGNALED(status)) {
syslog(LOG_WARNING, "Child process %d terminated with signal %d",
pid, WTERMSIG(status));
}
}
}
/*
* log_packet - format a packet and log it.
*/
static char line[256]; /* line to be logged accumulated here */
static char *linep;
static void pr_log __P((void *, char *, ...));
void log_packet(u_char *p,int len,char *prefix,int linkunit)
{
int i, n;
u_short proto;
u_char x;
struct protent *protp;
strcpy(line, prefix);
linep = line + strlen(line);
if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
p += 2;
GETSHORT(proto, p);
len -= PPP_HDRLEN;
for (i = 0; (protp = protocols[i]) != NULL; ++i) {
if (proto == protp->protocol)
break;
}
pr_log(NULL,"[%d]",linkunit);
if (protp) {
pr_log(NULL, "[%s", protp->name);
n = (*protp->printpkt)(p, len, pr_log, NULL);
pr_log(NULL, "]");
p += n;
len -= n;
} else {
pr_log(NULL, "[proto=0x%x]", proto);
}
}
for (; len > 0; --len) {
GETCHAR(x, p);
pr_log(NULL, " %.2x", x);
}
if (linep != line)
syslog(LOG_DEBUG, "%s", line);
}
#ifdef __STDC__
#include <stdarg.h>
static void pr_log(void *arg, char *fmt, ...)
{
int n;
va_list pvar;
char buf[256];
va_start(pvar, fmt);
vsprintf(buf, fmt, pvar);
va_end(pvar);
n = strlen(buf);
if (linep + n + 1 > line + sizeof(line)) {
syslog(LOG_DEBUG, "%s", line);
linep = line;
}
strcpy(linep, buf);
linep += n;
}
#else /* __STDC__ */
#include <varargs.h>
static void pr_log(arg, fmt, va_alist)
void *arg;
char *fmt;
va_dcl
{
int n;
va_list pvar;
char buf[256];
va_start(pvar);
vsprintf(buf, fmt, pvar);
va_end(pvar);
n = strlen(buf);
if (linep + n + 1 > line + sizeof(line)) {
syslog(LOG_DEBUG, "%s", line);
linep = line;
}
strcpy(linep, buf);
linep += n;
}
#endif
/*
* print_string - print a readable representation of a string using
* printer.
*/
void print_string(char *p,int len,void (*printer) __P((void *, char *, ...)),void *arg)
{
int c;
printer(arg, "\"");
for (; len > 0; --len) {
c = *p++;
if (' ' <= c && c <= '~')
printer(arg, "%c", c);
else
printer(arg, "\\%.3o", c);
}
printer(arg, "\"");
}
/*
* novm - log an error message saying we ran out of memory, and die.
*/
void novm(char *msg)
{
syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
die(1);
}
/*
* fmtmsg - format a message into a buffer. Like sprintf except we
* also specify the length of the output buffer, and we handle
* %r (recursive format), %m (error message) and %I (IP address) formats.
* Doesn't do floating-point formats.
* Returns the number of chars put into buf.
*/
int fmtmsg(char *buf, int buflen, char *fmt, ...)
{
va_list args;
int n;
#if __STDC__
va_start(args, fmt);
#else
char *buf;
int buflen;
char *fmt;
va_start(args);
buf = va_arg(args, char *);
buflen = va_arg(args, int);
fmt = va_arg(args, char *);
#endif
n = vfmtmsg(buf, buflen, fmt, args);
va_end(args);
return n;
}
/*
* vfmtmsg - like fmtmsg, takes a va_list instead of a list of args.
*/
#define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
int vfmtmsg(char *buf,int buflen,char *fmt,va_list args)
{
int c, i, n;
int width, prec, fillch;
int base, len, neg, quoted;
unsigned long val=0;
char *str, *f, *buf0;
unsigned char *p;
va_list a;
char num[32];
time_t t;
static char hexchars[] = "0123456789abcdef";
buf0 = buf;
--buflen;
while (buflen > 0) {
for (f = fmt; *f != '%' && *f != 0; ++f)
;
if (f > fmt) {
len = f - fmt;
if (len > buflen)
len = buflen;
memcpy(buf, fmt, len);
buf += len;
buflen -= len;
fmt = f;
}
if (*fmt == 0)
break;
c = *++fmt;
width = prec = 0;
fillch = ' ';
if (c == '0') {
fillch = '0';
c = *++fmt;
}
if (c == '*') {
width = va_arg(args, int);
c = *++fmt;
} else {
while (isdigit(c)) {
width = width * 10 + c - '0';
c = *++fmt;
}
}
if (c == '.') {
c = *++fmt;
if (c == '*') {
prec = va_arg(args, int);
c = *++fmt;
} else {
while (isdigit(c)) {
prec = prec * 10 + c - '0';
c = *++fmt;
}
}
}
str = 0;
base = 0;
neg = 0;
++fmt;
switch (c) {
case 'd':
i = va_arg(args, int);
if (i < 0) {
neg = 1;
val = -i;
} else
val = i;
base = 10;
break;
case 'o':
val = va_arg(args, unsigned int);
base = 8;
break;
case 'x':
val = va_arg(args, unsigned int);
base = 16;
break;
case 'p':
val = (unsigned long) va_arg(args, void *);
base = 16;
neg = 2;
break;
case 's':
str = va_arg(args, char *);
break;
case 'c':
num[0] = va_arg(args, int);
num[1] = 0;
str = num;
break;
case 'm':
str = strerror(errno);
break;
case 'I':
str = ip_ntoa(va_arg(args, u_int32_t));
break;
case 'r':
f = va_arg(args, char *);
a = va_arg(args, va_list);
#ifdef __alpha__ /* always do this? */
n = fmtmsg(buf, buflen + 1, f, a);
#else
n = vfmtmsg(buf, buflen + 1, f, a);
#endif
buf += n;
buflen -= n;
continue;
case 't':
time(&t);
str = ctime(&t);
str += 4; /* chop off the day name */
str[15] = 0; /* chop off year and newline */
break;
case 'v': /* "visible" string */
case 'q': /* quoted string */
quoted = c == 'q';
p = va_arg(args, unsigned char *);
if (fillch == '0' && prec > 0) {
n = prec;
} else {
n = strlen((char *)p);
if (prec > 0 && prec < n)
n = prec;
}
while (n > 0 && buflen > 0) {
c = *p++;
--n;
if (!quoted && c >= 0x80) {
OUTCHAR('M');
OUTCHAR('-');
c -= 0x80;
}
if (quoted && (c == '"' || c == '\\'))
OUTCHAR('\\');
if ( (c < 0x20 || 0x7f <= c) && c < 0xa0) {
if (quoted) {
OUTCHAR('\\');
switch (c) {
case '\t': OUTCHAR('t'); break;
case '\n': OUTCHAR('n'); break;
case '\b': OUTCHAR('b'); break;
case '\f': OUTCHAR('f'); break;
default:
OUTCHAR('x');
OUTCHAR(hexchars[c >> 4]);
OUTCHAR(hexchars[c & 0xf]);
}
} else {
if (c == '\t')
OUTCHAR(c);
else {
OUTCHAR('^');
OUTCHAR(c ^ 0x40);
}
}
} else
OUTCHAR(c);
}
continue;
default:
*buf++ = '%';
if (c != '%')
--fmt; /* so %z outputs %z etc. */
--buflen;
continue;
}
if (base != 0) {
str = num + sizeof(num);
*--str = 0;
while (str > num + neg) {
*--str = hexchars[val % base];
val = val / base;
if (--prec <= 0 && val == 0)
break;
}
switch (neg) {
case 1:
*--str = '-';
break;
case 2:
*--str = 'x';
*--str = '0';
break;
}
len = num + sizeof(num) - 1 - str;
} else {
len = strlen(str);
if (prec > 0 && len > prec)
len = prec;
}
if (width > 0) {
if (width > buflen)
width = buflen;
if ((n = width - len) > 0) {
buflen -= n;
for (; n > 0; --n)
*buf++ = fillch;
}
}
if (len > buflen)
len = buflen;
memcpy(buf, str, len);
buf += len;
buflen -= len;
}
*buf = 0;
return buf - buf0;
}
void reload_config(void)
{
auth_reload_upap_pw();
}
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