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isdn4k-utils/ipppd/sys-linux.c

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/*
* sys-linux.c - System-dependent procedures for setting up
* PPP interfaces on Linux systems
*
* 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.
*/
char sys_rcsid[] = "$Id: sys-linux.c,v 1.15 1998/10/29 17:28:49 hipp Exp $";
#define _LINUX_STRING_H_
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/utsname.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <memory.h>
#include <utmp.h>
#include <mntent.h>
#include <signal.h>
#include <fcntl.h>
#include <ctype.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include </usr/include/net/if.h>
#include </usr/include/net/if_arp.h>
#include </usr/include/net/route.h>
#if defined __GLIBC__ && __GLIBC__ >= 2
# include </usr/include/net/ppp_defs.h>
# include </usr/include/net/if_ppp.h>
# include </usr/include/net/ethernet.h>
# include "route.h"
#else
# include <linux/ppp_defs.h>
# include <linux/if_ppp.h>
# include <linux/if_ether.h>
#endif
#include <linux/isdn_ppp.h>
#include "fsm.h"
#include "ipppd.h"
#include "ipcp.h"
#include "ipxcp.h"
#include "ccp.h"
#include "lcp.h"
extern int force_driver;
static int prev_kdebugflag = 0;
static int has_default_route = 0;
static int driver_version = 0;
static int driver_modification = 0;
static int driver_patch = 0;
static int devroute = -1; /* 0 for Linux >= 2.1.x */
static int last_net_mask = 0; /* Ugly! */
int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr, char *name);
static void decode_version (char *buf, int *version,
int *modification, int *patch);
int sockfd; /* socket for doing interface ioctls */
static char *lock_file;
#define MAX_IFS 5000
#define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
#define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
/*
* SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
* if it exists.
*/
#define SET_SA_FAMILY(addr, family) \
memset ((char *) &(addr), '\0', sizeof(addr)); \
addr.sa_family = (family);
/*
* Determine if the PPP connection should still be present.
*/
#define still_ppp(linkunit) (lns[linkunit].hungup == 0)
/*
*
*/
void enable_mp(int linkunit,int flags)
{
int mpflags,s;
s = ioctl(lns[linkunit].fd,PPPIOCGMPFLAGS,(caddr_t) &mpflags);
if(s < 0)
syslog(LOG_ERR,"ipppd: Can't get MP-Flags");
else
{
mpflags |= SC_MP_PROT;
mpflags &= ~SC_REJ_MP_PROT;
mpflags |= flags;
s = ioctl(lns[linkunit].fd,PPPIOCSMPFLAGS,(caddr_t) &mpflags);
if(s < 0)
syslog(LOG_ERR,"ipppd: Can't set MP-Flags");
}
}
/*
* Functions to read and set the flags value in the device driver
*/
static int get_flags (int tu,int *error)
{
int flags;
*error = 0;
if(lns[tu].fd < 0) {
*error = 1;
return 0;
}
if (ioctl(lns[tu].fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
*error = 1;
return 0;
}
MAINDEBUG ((LOG_DEBUG, "get flags = %x\n", flags));
return flags;
}
static void set_flags (int flags,int tu)
{
MAINDEBUG ((LOG_DEBUG, "set flags = %x\n", flags));
if(lns[tu].fd < 0)
return;
if (ioctl(lns[tu].fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS, %x): %m", flags);
}
}
/*
* sys_init - System-dependent initialization.
*/
void sys_init(void)
{
struct utsname uts;
int maj, min, pat;
openlog("ipppd", 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 ioctls. */
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
syslog(LOG_ERR, "Couldn't create IP socket: %m");
die(1);
}
if (devroute < 0) {
uname(&uts);
maj = min = pat = 0;
decode_version(uts.release, &maj, &min, &pat);
if (maj >= 2 && min >= 1) /* Linux >= 2.1.x */
devroute = 0;
else
devroute = 1;
}
}
/*
* note_debug_level - note a change in the debug level.
*/
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));
}
/*
* set_kdebugflag - Define the debugging level for the kernel
*/
int set_kdebugflag (int requested_level,int tu)
{
if (ioctl(lns[tu].fd, PPPIOCGDEBUG, &prev_kdebugflag) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCGDEBUG): %m");
return 0;
}
if (prev_kdebugflag != requested_level) {
if (ioctl(lns[tu].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;
}
/*
* establish_ppp - get UNIT, callinfo, IF-MTU
*/
void establish_ppp (int linkunit)
{
if (ioctl(lns[linkunit].fd, PPPIOCGUNIT, &lns[linkunit].ifunit) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
lns[linkunit].ifunit = -1;
return;
}
lns[linkunit].master = -1;
sprintf(lns[linkunit].ifname,"%s%d","ippp",lns[linkunit].ifunit);
if( ioctl(lns[linkunit].fd, PPPIOCGCALLINFO, &lns[linkunit].pci) == 0) {
struct pppcallinfo *pci = &lns[linkunit].pci;
syslog(LOG_NOTICE, "Local number: %s, Remote number: %s, Type: %s",
pci->local_num,pci->remote_num,pci->calltype & CALLTYPE_INCOMING ? "incoming" : "outgoing" );
#ifdef RADIUS
strncpy ( lns[linkunit].remote_number, pci->remote_num, sizeof( lns[linkunit].remote_number ) ) ;
#endif
}
if(useifmtu) {
struct ifreq ifr;
memset (&ifr, '\0', sizeof (ifr));
strncpy(ifr.ifr_name, lns[linkunit].ifname, sizeof (ifr.ifr_name));
if (ioctl(sockfd, SIOCGIFMTU, (caddr_t) &ifr) < 0)
syslog(LOG_NOTICE , "Can't get MTU from device %s",lns[linkunit].ifname);
else
lcp_allowoptions[lns[linkunit].lcp_unit].mru = ifr.ifr_mtu;
}
#if 0
set_kdebugflag (kdebugflag,linkunit);
#endif
MAINDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver",
driver_version, driver_modification, driver_patch));
}
/*
* output - Output PPP packet.
*/
void output_ppp (int linkunit, unsigned char *p, int len)
{
if (debug)
log_packet(p, len, "sent ",linkunit);
if (write(lns[linkunit].fd, p, len) < 0) {
syslog(LOG_ERR, "write, unit: %d fd: %d: %m",linkunit,lns[linkunit].fd);
die(1);
}
}
/*
* read_packet - get a PPP packet from the serial device.
*/
int read_packet (unsigned char *buf,int linkunit)
{
int len;
len = read(lns[linkunit].fd, buf, PPP_MTU + PPP_HDRLEN);
if (len < 0) {
if (errno == EWOULDBLOCK)
return -1;
syslog(LOG_ERR, "read(fd): %m");
die(1);
}
return len;
}
/*
* ppp_send_config - configure the transmit characteristics of
* the ppp interface.
*/
void ppp_send_config (int unit,int mtu,u_int32_t asyncmap,int pcomp,int accomp)
{
u_int x;
struct ifreq ifr;
int err;
MAINDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
/*
* Ensure that the link is still up.
*/
if (still_ppp(unit)) {
/*
* Set the MTU and other parameters for the ppp device
*/
if(lns[unit].master < 0) {
memset (&ifr, '\0', sizeof (ifr));
strncpy(ifr.ifr_name, lns[unit].ifname, sizeof (ifr.ifr_name));
ifr.ifr_mtu = mtu;
if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m, %d %s %d.",sockfd,ifr.ifr_name,ifr.ifr_mtu);
}
}
x = get_flags(unit,&err);
if(err)
return;
x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
set_flags(x,unit);
}
}
/*
* ppp_mp_send_config, ppp_mp_recv_config
*/
void ppp_mp_send_config(int unit,int mtu)
{
int r;
r = ioctl(lns[unit].fd,PPPIOCSMPMTU,&mtu);
syslog(LOG_DEBUG,"mp_mtu: %d",r);
}
void ppp_mp_recv_config(int unit,int mru)
{
int r;
r = ioctl(lns[unit].fd,PPPIOCSMPMRU,&mru);
syslog(LOG_DEBUG,"mp_mru: %d",r);
}
/*
* ppp_set_xaccm - set the extended transmit ACCM for the interface.
*/
void ppp_set_xaccm (int unit, ext_accm accm)
{
#if 0
MAINDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
accm[0], accm[1], accm[2], accm[3]));
if (ioctl(lns[unit].fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
#endif
}
/*
* ppp_recv_config - configure the receive-side characteristics of
* the ppp interface.
*/
void ppp_recv_config (int unit,int mru,u_int32_t asyncmap,int pcomp,int accomp)
{
u_int x;
int err;
/*
* 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(unit))
return;
/*
* Set the receiver parameters
*/
if (ioctl(lns[unit].fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
x = get_flags(unit,&err);
if(err)
return;
x = accomp ? x & ~SC_REJ_COMP_AC : x | SC_REJ_COMP_AC;
set_flags (x,unit);
}
/*
* ccp_test - ask kernel whether a given compression method
* is acceptable for use.
*/
int ccp_test (int ccp_unit, u_char *opt_ptr, int opt_len, int for_transmit)
{
#ifdef NEW_VERS
struct isdn_ppp_comp_data data;
int linkunit = ccp_fsm[ccp_unit].unit;
memset (&data, '\0', sizeof (data));
data.num = opt_ptr[0];
data.optlen = opt_len - 2;
if(data.optlen > ISDN_PPP_COMP_MAX_OPTIONS) {
syslog(LOG_NOTICE, "ccp_test: options field too long!\n");
return -1;
}
memcpy(data.options,opt_ptr+2,data.optlen);
data.flags = 0;
if(for_transmit)
data.flags |= IPPP_COMP_FLAG_XMIT;
if(ccp_fsm[ccp_unit].protocol == PPP_LINK_CCP)
data.flags |= IPPP_COMP_FLAG_LINK;
if (ioctl(lns[linkunit].fd, PPPIOCSCOMPRESSOR, (caddr_t) &data) >= 0)
return 1;
return (errno == ENOBUFS)? 0: -1;
#else
return -1;
#endif
}
int ccp_get_compressors(int ccp_unit,unsigned long *protos)
{
int linkunit = ccp_fsm[ccp_unit].unit;
if (ioctl(lns[linkunit].fd, PPPIOCGCOMPRESSORS, protos) >= 0)
return 0;
return -1;
}
/*
* ccp_flags_set - inform kernel about the current state of CCP.
*/
void ccp_flags_set (int ccp_unit, int isopen, int isup)
{
int linkunit = ccp_fsm[ccp_unit].unit;
int err;
if (still_ppp(linkunit)) {
int x = get_flags(linkunit,&err);
if(err)
return;
x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
set_flags (x,linkunit);
}
}
/*
* 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 (int ccp_unit)
{
int linkunit = ccp_fsm[ccp_unit].unit;
int err;
int x = get_flags(linkunit,&err);
if(err)
return 0;
return x & SC_DC_FERROR;
}
/*
* sifvjcomp - config tcp header compression
*/
int sifvjcomp (int unit, int vjcomp, int cidcomp, int maxcid)
{
int err;
u_int x = get_flags(unit,&err);
if(err)
return 0;
if (vjcomp) {
if (ioctl (lns[unit].fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
syslog (LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
vjcomp = 0;
}
}
x = vjcomp ? x | SC_COMP_TCP : x & ~SC_COMP_TCP;
x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
set_flags (x,unit);
return 1;
}
/*
* sifup - Config the interface up and enable IP packets to pass.
*/
int sifup (int u)
{
struct ifreq ifr;
u_int x;
memset (&ifr, '\0', sizeof (ifr));
strncpy(ifr.ifr_name, lns[u].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 | IFF_POINTOPOINT);
if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
return 0;
}
if( ioctl(lns[u].fd,PPPIOCGFLAGS,(caddr_t) &x) < 0) {
syslog(LOG_ERR,"ioctl(PPPIOCGFLAGS): %m");
return 0;
}
x |= SC_ENABLE_IP;
if( ioctl(lns[u].fd,PPPIOCSFLAGS,(caddr_t) &x) < 0) {
syslog(LOG_ERR,"ioctl(PPPIOCSFLAGS): %m");
return 0;
}
return 1;
}
/*
* sifdown - Config the interface down and disable IP.
*/
int sifdown (int u)
{
struct ifreq ifr;
memset (&ifr, '\0', sizeof (ifr));
strncpy(ifr.ifr_name, lns[u].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;
ifr.ifr_flags |= IFF_POINTOPOINT;
if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
return 0;
}
return 1;
}
/*
* sifbundle
*/
int sifbundle (int linkunit0,int linkunit1)
{
return ioctl(lns[linkunit0].fd, PPPIOCBUNDLE, &lns[linkunit1].ifunit );
}
/*
* sifaddr - Config the interface IP addresses and netmask.
*/
int sifaddr (int unit, int our_adr, int his_adr, int net_mask)
{
struct ifreq ifr;
struct rtentry rt;
memset (&ifr, '\0', sizeof (ifr));
memset (&rt, '\0', sizeof (rt));
SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
strncpy (ifr.ifr_name, lns[unit].ifname, sizeof (ifr.ifr_name));
/*
* Set our IP address
*/
((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = our_adr;
if (ioctl(sockfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
if (errno != EEXIST) {
syslog (LOG_ERR, "ioctl(SIOCAIFADDR): %m");
} else {
syslog (LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
}
return (0);
}
/*
* Set the gateway address
*/
((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = his_adr;
if (ioctl(sockfd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
syslog (LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m");
return (0);
}
/*
* Set the netmask
*/
if (net_mask != 0) {
((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = net_mask;
if (ioctl(sockfd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
syslog (LOG_ERR, "ioctl(SIOCSIFNETMASK): %m");
return (0);
}
}
last_net_mask = net_mask;
/*
* Add the device route
*/
if (!devroute)
return 1;
if (hostroute) {
SET_SA_FAMILY (rt.rt_dst, AF_INET);
SET_SA_FAMILY (rt.rt_gateway, AF_INET);
SET_SA_FAMILY (rt.rt_genmask, AF_INET);
rt.rt_dev = lns[unit].ifname; /* MJC */
if (net_mask)
his_adr &= net_mask;
((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0L;
((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = net_mask;
rt.rt_flags = RTF_UP;
if (net_mask == 0)
rt.rt_flags |= RTF_HOST;
if (ioctl(sockfd, SIOCADDRT, &rt) < 0) {
syslog (LOG_ERR, "ioctl(SIOCADDRT) device route (%s/%s/%08x): %m",
rt.rt_dev,
inet_ntoa(((struct sockaddr_in *)&rt.rt_dst)->sin_addr),
ntohl(net_mask));
return (0);
}
}
return 1;
}
/*
* cifaddr - Clear the interface IP addresses, and delete routes
* through the interface if possible.
*/
int cifaddr (int unit, int our_adr, int his_adr)
{
struct rtentry rt;
/*
* Delete the route through the device
*/
if (!devroute)
return 1;
memset (&rt, '\0', sizeof (rt));
SET_SA_FAMILY (rt.rt_dst, AF_INET);
SET_SA_FAMILY (rt.rt_gateway, AF_INET);
SET_SA_FAMILY (rt.rt_genmask, AF_INET);
rt.rt_dev = lns[unit].ifname; /* MJC */
if (last_net_mask)
his_adr &= last_net_mask;
((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = last_net_mask;
rt.rt_flags = RTF_UP;
if (last_net_mask == 0)
rt.rt_flags |= RTF_HOST;
if (ioctl(sockfd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
if (still_ppp(unit)) {
syslog (LOG_ERR, "ioctl(SIOCDELRT) device route: %m");
return (0);
}
}
return 1;
}
/*
* path_to_proc - determine the path to the proc file system data
*/
FILE *route_fd = (FILE *) 0;
static char route_buffer [512];
static char *path_to_proc (void);
static int open_route_table (void);
static void close_route_table (void);
static int read_route_table (struct rtentry *rt);
static int defaultroute_exists (void);
/*
* path_to_proc - find the path to the route tables in the proc file system
*/
static char *path_to_proc (void)
{
struct mntent *mntent;
FILE *fp;
fp = fopen (MOUNTED, "r");
if (fp != 0)
{
mntent = getmntent (fp);
while (mntent != (struct mntent *) 0)
{
if (strcmp (mntent->mnt_type, MNTTYPE_IGNORE) != 0)
{
if (strcmp (mntent->mnt_type, "proc") == 0)
{
strncpy (route_buffer, mntent->mnt_dir,
sizeof (route_buffer)-10);
route_buffer [sizeof (route_buffer)-10] = '\0';
fclose (fp);
return (route_buffer);
}
}
mntent = getmntent (fp);
}
fclose (fp);
}
syslog (LOG_ERR, "proc file system not mounted");
return 0;
}
/*
* close_route_table - close the interface to the route table
*/
static void close_route_table (void)
{
if (route_fd != (FILE *) 0) {
fclose (route_fd);
route_fd = (FILE *) 0;
}
}
/*
* open_route_table - open the interface to the route table
*/
static int open_route_table (void)
{
char *path;
close_route_table();
path = path_to_proc();
if (path == NULL)
{
return 0;
}
strcat (path, "/net/route");
route_fd = fopen (path, "r");
if (route_fd == (FILE *) 0)
{
syslog (LOG_ERR, "can not open %s: %m", path);
return 0;
}
return 1;
}
/*
* read_route_table - read the next entry from the route table
*/
static int read_route_table (struct rtentry *rt)
{
static char delims[] = " \t\n";
char *dev_ptr, *dst_ptr, *gw_ptr, *flag_ptr;
memset (rt, '\0', sizeof (struct rtentry));
for (;;)
{
if (fgets (route_buffer, sizeof (route_buffer), route_fd) ==
(char *) 0)
{
return 0;
}
dev_ptr = strtok (route_buffer, delims); /* interface name */
dst_ptr = strtok (NULL, delims); /* destination address */
gw_ptr = strtok (NULL, delims); /* gateway */
flag_ptr = strtok (NULL, delims); /* flags */
if (flag_ptr == (char *) 0) /* assume that we failed, somewhere. */
{
return 0;
}
/* Discard that stupid header line which should never
* have been there in the first place !! */
if (isxdigit (*dst_ptr) && isxdigit (*gw_ptr) && isxdigit (*flag_ptr))
{
break;
}
}
((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr =
strtoul (dst_ptr, NULL, 16);
((struct sockaddr_in *) &rt->rt_gateway)->sin_addr.s_addr =
strtoul (gw_ptr, NULL, 16);
rt->rt_flags = (short) strtoul (flag_ptr, NULL, 16);
rt->rt_dev = dev_ptr;
return 1;
}
/*
* defaultroute_exists - determine if there is a default route
*/
static int defaultroute_exists (void)
{
struct rtentry rt;
int result = 0;
if (!open_route_table())
{
return 0;
}
while (read_route_table(&rt) != 0)
{
if ((rt.rt_flags & RTF_UP) == 0)
{
continue;
}
if (((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr == 0L)
{
struct in_addr ina;
ina.s_addr = ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr;
syslog (LOG_ERR,
"ppp not replacing existing default route to %s[%s]",
rt.rt_dev, inet_ntoa (ina) );
result = 1;
break;
}
}
close_route_table();
return result;
}
/*
* sifdefaultroute - assign a default route through the address given.
*/
int sifdefaultroute (int unit, int gateway)
{
struct rtentry rt;
if (has_default_route == 0) {
if (defaultroute_exists())
return 0;
memset (&rt, '\0', 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 = gateway;
rt.rt_flags = RTF_UP | RTF_GATEWAY;
if (ioctl(sockfd, SIOCADDRT, &rt) < 0) {
syslog (LOG_ERR, "default route ioctl(SIOCADDRT): %m");
return 0;
}
}
has_default_route = 1;
return 1;
}
/*
* cifdefaultroute - delete a default route through the address given.
*/
int cifdefaultroute (int unit, int gateway)
{
struct rtentry rt;
if (has_default_route) {
memset (&rt, '\0', 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 = gateway;
rt.rt_flags = RTF_UP | RTF_GATEWAY;
if (ioctl(sockfd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
if (still_ppp(unit)) {
syslog (LOG_ERR, "default route ioctl(SIOCDELRT): %m");
return 0;
}
}
}
has_default_route = 0;
return 1;
}
/*
* sifproxyarp - Make a proxy ARP entry for the peer.
*/
int sifproxyarp (int linkunit, u_int32_t his_adr)
{
struct arpreq arpreq;
if (lns[linkunit].has_proxy_arp == 0) {
memset (&arpreq, '\0', sizeof(arpreq));
/*
* Get the hardware address of an interface on the same subnet
* as our local address.
*/
if (!get_ether_addr(his_adr, &arpreq.arp_ha, arpreq.arp_dev)) {
syslog(LOG_ERR, "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 = his_adr;
arpreq.arp_flags = ATF_PERM | ATF_PUBL;
if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
return 0;
}
}
lns[linkunit].has_proxy_arp = 1;
return 1;
}
/*
* cifproxyarp - Delete the proxy ARP entry for the peer.
*/
int cifproxyarp (int linkunit, u_int32_t his_adr)
{
struct arpreq arpreq;
if (lns[linkunit].has_proxy_arp == 1) {
memset (&arpreq, '\0', sizeof(arpreq));
SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
arpreq.arp_flags = ATF_PERM | ATF_PUBL;
((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
return 0;
}
}
lns[linkunit].has_proxy_arp = 0;
return 1;
}
/*
* get_ether_addr - get the hardware address of an interface on the
* the same subnet as ipaddr.
*/
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;
u_int32_t ina, mask;
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;
}
int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr, char *name)
{
int ifs_len;
int answer;
void *base_addr;
/*
* Allocate memory to hold the request.
*/
ifs_len = MAX_IFS * sizeof (struct ifreq);
base_addr = (void *) malloc (ifs_len);
if (!base_addr) {
syslog(LOG_ERR, "malloc(%d) failed to return memory", ifs_len);
return 0;
}
/*
* Find the hardware address associated with the controller
*/
answer = local_get_ether_addr (ipaddr, hwaddr, name,
(struct ifreq *) base_addr, ifs_len);
free (base_addr);
return answer;
}
/*
* 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.
*
* If our address happens to be in the same network/subnet as one of
* the other interfaces, set the netmask to 255.255.255.255
*
* FIXME: This stuff is OLD and should be rewritten (we now use CIDR remember).
*/
static u_int32_t local_GetMask (u_int32_t addr, struct ifreq *ifs, int ifs_len)
{
u_int32_t mask, nmask, ina;
struct ifreq *ifr, *ifend, ifreq;
struct ifconf ifc;
ina = ntohl(addr);
if (IN_CLASSA(ina)) { /* determine network mask for address class */
nmask = IN_CLASSA_NET;
} else {
if (IN_CLASSB(ina)) {
nmask = IN_CLASSB_NET;
} else {
nmask = IN_CLASSC_NET;
}
}
nmask = htonl(nmask);
/* class D nets are disallowed by bad_ip_adrs */
mask = netmask | nmask;
if (ifs == (void *) 0) {
return mask;
}
/*
* Scan through the system's network interfaces.
*/
ifc.ifc_len = ifs_len;
ifc.ifc_req = ifs;
if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m");
return mask;
}
ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
if (ifr->ifr_addr.sa_family != AF_INET) {
continue;
}
/*
* Check that the interface is up, and not point-to-point nor loopback.
*/
strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
continue;
if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
continue;
/*
* See if our IP address is part of this subnet.
*/
ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
if (ina == addr)
continue;
if ((ina & nmask) == (addr & nmask)) {
mask = 0xFFFFFFFF;
break;
}
/*
* Check the interface's internet address.
*/
if (((ina ^ addr) & nmask) != 0)
continue;
/*
* Get its netmask and OR it into our mask.
*/
if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
continue;
mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
break;
}
return mask;
}
u_int32_t GetMask (u_int32_t addr)
{
int ifs_len;
u_int32_t answer;
void *base_addr;
/*
* If user set netmask assume he knows what he's doing.
*/
if (netmask) return netmask;
/*
* Allocate memory to hold the request.
*/
ifs_len = MAX_IFS * sizeof (struct ifreq);
base_addr = (void *) malloc (ifs_len);
if (base_addr == (void *) 0)
{
syslog(LOG_ERR, "malloc(%d) failed to return memory", ifs_len);
}
/*
* Find the netmask used on the same network.
*/
answer = local_GetMask (addr, (struct ifreq *) base_addr, ifs_len);
if (base_addr != (void *) 0)
{
free (base_addr);
}
return answer;
}
/*
* Internal routine to decode the version.modification.patch level
*/
static void decode_version (char *buf, int *version,
int *modification, int *patch)
{
*version = (int) strtoul (buf, &buf, 10);
*modification = 0;
*patch = 0;
if (*buf == '.')
{
++buf;
*modification = (int) strtoul (buf, &buf, 10);
if (*buf == '.')
{
++buf;
*patch = (int) strtoul (buf, &buf, 10);
}
}
if (*buf != '\0')
{
*version =
*modification =
*patch = 0;
}
}
/*
* ppp_available - check whether the system has any ppp interfaces
* (in fact we check whether we can do an ioctl on ppp0).
*/
int ppp_available(void)
{
int s;
struct ifreq ifr;
char abBuffer [1024];
int my_version, my_modification, my_patch;
/*
* Open a socket for doing the ioctl operations.
*/
if( (s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
return 0;
strncpy (ifr.ifr_name, "ippp0", sizeof (ifr.ifr_name));
if(ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0)
return 0;
/*
* This is the PPP device. Validate the version of the driver at this
* point to ensure that this program will work with the driver.
*/
ifr.ifr_data = abBuffer;
if (ioctl (s, SIOCGPPPVER, (caddr_t) &ifr) >= 0)
decode_version (abBuffer, &driver_version, &driver_modification, &driver_patch);
else
driver_version = driver_modification = driver_patch = 0;
close(s);
/*
* Validate the version of the driver against the version that we used.
*/
decode_version (IPPP_VERSION, &my_version, &my_modification, &my_patch);
/* The version numbers must match and the modification levels must be legal */
if ( (driver_version != my_version || driver_modification < my_modification) && !force_driver)
{
extern char *no_ppp_msg;
no_ppp_msg = route_buffer;
sprintf(no_ppp_msg,
"Sorry - isdnPPP driver version %d.%d.%d is out of date.\n"
"Maybe ippp0 has no 'syncppp' encapsulation?\n",
driver_version, driver_modification, driver_patch);
return 0;
}
return 1;
}
/*
* Update the wtmp file with the appropriate user name and tty device.
*/
int logwtmputmp (int unit,char *line, char *name, char *host)
{
struct utmp ut, *utp;
pid_t mypid = getpid();
/*
* Update the signon database for users.
* Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
*/
utmpname(_PATH_UTMP);
setutent();
while( (utp = getutent()) && (utp->ut_pid != mypid) )
;
/*
* Is this call really necessary? There is another one after the 'put'
*/
endutent();
if (utp)
memcpy(&ut, utp, sizeof(ut));
else {
/* some gettys/telnetds don't initialize utmp... */
memset(&ut, 0, sizeof(ut));
}
if (ut.ut_id[0] == 0)
strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
strncpy(ut.ut_user, name, sizeof(ut.ut_user));
strncpy(ut.ut_line, line, sizeof(ut.ut_line));
ut.ut_time = time((void *)0);
ut.ut_type = USER_PROCESS;
ut.ut_pid = mypid;
/*
* Insert the host name if one is supplied
*/
if (*host)
strncpy (ut.ut_host, host, sizeof(ut.ut_host));
/*
* Insert the IP address of the remote system if IP is enabled
*/
if (ipcp_hisoptions[unit].neg_addr)
memcpy (&ut.ut_addr, (char *) &ipcp_hisoptions[unit].hisaddr,
sizeof(ut.ut_addr));
/*
* CL: Makes sure that the logout works
*/
if (*host == 0 && *name==0)
ut.ut_host[0]=0;
pututline(&ut);
endutent();
/*
* Update the wtmp file.
*/
#if (defined __GLIBC__ && __GLIBC__ >= 2)
updwtmp (_PATH_WTMP, &ut);
#else
{
int wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
if (wtmp >= 0) {
flock(wtmp, LOCK_EX);
/*
* we really should check for error on
* the write for a full disk!
*/
write (wtmp, (char *)&ut, sizeof(ut));
close (wtmp);
flock(wtmp, LOCK_UN);
}
}
#endif
return 0;
}
/*
* Code for locking/unlocking the serial device.
* This code is derived from chat.c.
*/
#ifndef LOCK_PREFIX
#define LOCK_PREFIX "/var/lock/LCK.."
#endif
/*
* lock - create a lock file for the named device
*/
int lock (char *dev)
{
char hdb_lock_buffer[12];
int lfd, pid, n;
char *p;
p = strrchr(dev, '/');
if (p != NULL)
{
dev = ++p;
}
lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1);
if (lock_file == NULL)
{
novm("lock file name");
}
strcpy (lock_file, LOCK_PREFIX);
strcat (lock_file, dev);
/*
* Attempt to create the lock file at this point.
*/
while (1)
{
lfd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644);
if (lfd >= 0)
{
pid = getpid();
#ifndef PID_BINARY
sprintf (hdb_lock_buffer, "%010d\n", pid);
write (lfd, hdb_lock_buffer, 11);
#else
write(lfd, &pid, sizeof (pid));
#endif
close(lfd);
return 0;
}
/*
* If the file exists then check to see if the pid is stale
*/
if (errno == EEXIST)
{
lfd = open(lock_file, O_RDONLY, 0);
if (lfd < 0)
{
if (errno == ENOENT) /* This is just a timing problem. */
{
continue;
}
break;
}
/* Read the lock file to find out who has the device locked */
n = read (lfd, hdb_lock_buffer, 11);
close (lfd);
if (n < 0)
{
syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
break;
}
/* See the process still exists. */
if (n > 0)
{
#ifndef PID_BINARY
hdb_lock_buffer[n] = '\0';
sscanf (hdb_lock_buffer, " %d", &pid);
#else
pid = ((int *) hdb_lock_buffer)[0];
#endif
if (pid == 0 || (kill(pid, 0) == -1 && errno == ESRCH))
{
n = 0;
}
}
/* If the process does not exist then try to remove the lock */
if (n == 0 && unlink (lock_file) == 0)
{
syslog (LOG_NOTICE, "Removed stale lock on %s (pid %d)",
dev, pid);
continue;
}
syslog (LOG_NOTICE, "Device %s is locked by pid %d", dev, pid);
break;
}
syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file);
break;
}
free(lock_file);
lock_file = NULL;
return -1;
}
/*
* unlock - remove our lockfile
*/
void unlock(void)
{
if (lock_file)
{
unlink(lock_file);
free(lock_file);
lock_file = NULL;
}
}
void setifip(int ipcp_unit)
{
u_int32_t ouraddr,hisaddr;
struct ifreq ifr;
extern ipcp_options ipcp_wantoptions[NUM_PPP];
ipcp_options *wo = &ipcp_wantoptions[ipcp_unit];
memset (&ifr, '\0', sizeof (ifr));
strncpy(ifr.ifr_name,lns[ipcp_fsm[ipcp_unit].unit].ifname,sizeof(ifr.ifr_name));
if(ioctl(sockfd,SIOCGIFADDR,(caddr_t) &ifr) < 0)
{
syslog(LOG_ERR,"ioctl(SIOCGIFADDR): %m");
return;
}
ouraddr = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr;
if(debug)
syslog (LOG_DEBUG, "got if-src: %08lx\n",(unsigned long) ouraddr);
if(ouraddr)
wo->ouraddr = ouraddr;
if(ioctl(sockfd,SIOCGIFDSTADDR,(caddr_t) &ifr) < 0)
{
syslog(LOG_ERR,"ioctl(SIOCGIFDSTADDR): %m");
return;
}
hisaddr = ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr;
if(debug)
syslog (LOG_DEBUG, "got if-dst: %08lx\n",(unsigned long) hisaddr);
if(hisaddr)
wo->hisaddr = hisaddr;
}
/************************ IPX SUPPORT *********************************/
#if defined(__GLIBC__) && (__GLIBC__ > 1)
/* <linux/ipx.h> includes <linux/socket.h>, which breaks glibc 2.x support. Prevent that... */
# define _LINUX_SOCKET_H
#endif
#include <linux/ipx.h>
/*
* sipxfaddr - Config the interface IPX networknumber
*/
int sipxfaddr (int unit, u_int32_t network, unsigned char * node )
{
int skfd;
int result = 1;
/* 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");
result = 0;
}
else
{
memset (&ifr, '\0', sizeof (ifr));
strcpy (ifr.ifr_name, lns[unit].ifname);
memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
sipx->sipx_family = AF_IPX;
sipx->sipx_port = 0;
sipx->sipx_network = htonl (network);
sipx->sipx_type = IPX_FRAME_ETHERII;
sipx->sipx_action = IPX_CRTITF;
/*
* Set the IPX device
*/
if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0)
{
result = 0;
if (errno != EEXIST)
{
syslog (LOG_DEBUG, "ioctl(SIOCAIFADDR, CRTITF): %m");
}
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 linkunit)
{
int skfd;
int result = 1;
/* 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");
result = 0;
}
else
{
memset (&ifr, '\0', sizeof (ifr));
strcpy (ifr.ifr_name, lns[linkunit].ifname);
sipx->sipx_type = IPX_FRAME_ETHERII;
sipx->sipx_action = IPX_DLTITF;
sipx->sipx_family = AF_IPX;
/*
* Set the IPX device
*/
if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0)
{
syslog (LOG_INFO, "ioctl(SIOCAIFADDR, IPX_DLTITF) %d: %m", errno);
result = 0;
}
close (skfd);
}
return result;
}
/*
* Turn off any option which is not supported by this implementation.
*
* This procedure is called after all of the options have been processed.
* It gives the implementation a chance to alter the configurtion options
* based upon the current support by the operating system.
*/
void remove_sys_options(void)
{
struct stat stat_buf;
/*
* Disable the IPX protocol if the support is not present in the kernel.
* If we disable it then ensure that IP support is enabled.
*/
while (ipxcp_protent.enabled_flag) {
char *path = path_to_proc();
if (path != NULL) {
strcat (path, "/net/ipx_interface");
if (lstat (path, &stat_buf) >= 0)
break;
}
syslog (LOG_ERR, "IPX support is not present in the kernel\n");
ipxcp_protent.enabled_flag = 0;
ipcp_protent.enabled_flag = 1;
break;
}
}
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