freebsd-src/usr.sbin/pppd/sys-linux.c
1994-09-25 02:11:26 +00:00

831 lines
20 KiB
C

/*
* sys-linux.c - System-dependent procedures for setting up
* PPP interfaces on Linux systems
*
* 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.
*/
/*
* TODO:
*/
#include <stdio.h>
#include <syslog.h>
#include <string.h>
#include <time.h>
#include <memory.h>
#include <utmp.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/errno.h>
#include <mntent.h>
#include <net/if.h>
#include <linux/ppp.h>
#include <linux/route.h>
#include <linux/if_ether.h>
#include <netinet/in.h>
#include <signal.h>
#include "pppd.h"
#include "ppp.h"
#include "fsm.h"
#include "ipcp.h"
static int initdisc = -1; /* Initial TTY discipline */
static int prev_kdebugflag = 0;
extern int kdebugflag;
extern u_long netmask;
#define MAX_IFS 32
/* prototypes */
void die __ARGS((int));
/*
* 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);
/*
* set_kdebugflag - Define the debugging level for the kernel
*/
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);
}
syslog(LOG_INFO, "set kernel debugging level to %d", requested_level);
}
return (1);
}
/*
* establish_ppp - Turn the serial port into a ppp interface.
*/
void establish_ppp (void)
{
int pppdisc = N_PPP;
int sig = SIGIO;
if (ioctl(fd, PPPIOCSINPSIG, &sig) == -1) {
syslog(LOG_ERR, "ioctl(PPPIOCSINPSIG): %m");
die(1);
}
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);
}
/*
* disestablish_ppp - Restore the serial port to normal operation.
* This shouldn't call die() because it's called from die().
*/
void disestablish_ppp(void)
{
int x;
char *s;
if (initdisc >= 0) {
set_kdebugflag (prev_kdebugflag);
/*
* Check whether the link seems not to be 8-bit clean.
*/
if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
s = NULL;
switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
case SC_RCV_B7_0:
s = "bit 7 set to 1";
break;
case SC_RCV_B7_1:
s = "bit 7 set to 0";
break;
case SC_RCV_EVNP:
s = "odd parity";
break;
case SC_RCV_ODDP:
s = "even parity";
break;
}
if (s != NULL) {
syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
syslog(LOG_WARNING, "All received characters had %s", s);
}
}
if (ioctl(fd, TIOCSETD, &initdisc) < 0)
syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
if (ioctl(fd, TIOCNXCL, 0) < 0)
syslog (LOG_WARNING, "ioctl(TIOCNXCL): %m");
initdisc = -1;
}
}
/*
* output - Output PPP packet.
*/
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);
}
}
/*
* read_packet - get a PPP packet from the serial device.
*/
int read_packet (unsigned char *buf)
{
int len;
len = read(fd, buf, MTU + DLLHEADERLEN);
if (len < 0) {
if (errno == EWOULDBLOCK) {
#if 0
MAINDEBUG((LOG_DEBUG, "read(fd): EWOULDBLOCK"));
#endif
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_long asyncmap,int pcomp,int accomp)
{
u_int x;
struct ifreq ifr;
MAINDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
ifr.ifr_mtu = mtu;
if (ioctl(s, 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();
}
if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
quit();
}
x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
MAINDEBUG ((LOG_DEBUG, "send_config: flags = %x\n", x));
if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
quit();
}
}
/*
* ppp_set_xaccm - set the extended transmit ACCM for the interface.
*/
void
ppp_set_xaccm(unit, accm)
int unit;
ext_accm accm;
{
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");
}
/*
* ppp_recv_config - configure the receive-side characteristics of
* the ppp interface.
*/
void ppp_recv_config (int unit,int mru,u_long asyncmap,int pcomp,int accomp)
{
u_int x;
MAINDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
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, PPPIOCRASYNCMAP, (caddr_t) &asyncmap) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCRASYNCMAP): %m");
quit();
}
if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
quit();
}
x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
MAINDEBUG ((LOG_DEBUG, "recv_config: flags = %x\n", x));
if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
quit();
}
}
/*
* sifvjcomp - config tcp header compression
*/
int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
{
u_int x;
if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
return 0;
}
x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
if(ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
return 0;
}
if (vjcomp) {
if (ioctl (fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
syslog (LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
return 0;
}
}
return 1;
}
/*
* sifup - Config the interface up and enable IP packets to pass.
*/
int sifup (int u)
{
struct ifreq ifr;
strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
return 0;
}
ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
return 0;
}
return 1;
}
/*
* sifdown - Config the interface down and disable IP.
*/
int sifdown (int u)
{
struct ifreq ifr;
strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
if (ioctl(s, 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(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
return 0;
}
return 1;
}
/*
* 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;
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, ifname, sizeof (ifr.ifr_name));
/*
* Set our IP address
*/
((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = our_adr;
if (ioctl(s, 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(s, 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(s, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
syslog (LOG_ERR, "ioctl(SIOCSIFNETMASK): %m");
return (0);
}
}
/*
* Add the device route
*/
memset (&rt, '\0', sizeof (rt));
SET_SA_FAMILY (rt.rt_dst, AF_INET);
SET_SA_FAMILY (rt.rt_gateway, AF_INET);
rt.rt_dev = ifname; /* MJC */
((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
rt.rt_flags = RTF_UP | RTF_HOST;
if (ioctl(s, SIOCADDRT, &rt) < 0) {
syslog (LOG_ERR, "ioctl(SIOCADDRT) device route: %m");
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
*/
memset (&rt, '\0', sizeof (rt));
SET_SA_FAMILY (rt.rt_dst, AF_INET);
SET_SA_FAMILY (rt.rt_gateway, AF_INET);
rt.rt_dev = ifname; /* MJC */
((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
rt.rt_flags = RTF_UP | RTF_HOST;
if (ioctl(s, SIOCDELRT, &rt) < 0) {
syslog (LOG_ERR, "ioctl(SIOCDELRT) device route: %m");
return (0);
}
return 1;
}
/*
* path_to_route - determine the path to the proc file system data
*/
FILE *route_fd = (FILE *) 0;
static char route_buffer [100];
static char *path_to_route (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_route - find the path to the route tables in the proc file system
*/
static char *path_to_route (void)
{
struct mntent *mntent;
FILE *fp;
fp = fopen (MOUNTED, "r");
if (fp != 0) {
while ((mntent = getmntent (fp)) != 0) {
if (strcmp (mntent->mnt_type, MNTTYPE_IGNORE) == 0)
continue;
if (strcmp (mntent->mnt_type, "proc") == 0) {
strncpy (route_buffer, mntent->mnt_dir,
sizeof (route_buffer)-10);
route_buffer [sizeof (route_buffer)-10] = '\0';
strcat (route_buffer, "/net/route");
fclose (fp);
return (route_buffer);
}
}
fclose (fp);
}
syslog (LOG_ERR, "proc file system not mounted");
return 0;
}
/*
* open_route_table - open the interface to the route table
*/
static int open_route_table (void)
{
char *path;
if (route_fd != (FILE *) 0)
close_route_table();
path = path_to_route();
if (path == NULL)
return 0;
route_fd = fopen (path, "r");
if (route_fd == (FILE *) 0) {
syslog (LOG_ERR, "can not open %s: %m", path);
return 0;
}
/* read and discard the header line. */
if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0) {
close_route_table();
return 0;
}
return 1;
}
/*
* 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;
}
}
/*
* 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, *ptr, *dst_ptr, *gw_ptr, *flag_ptr;
if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
return 0;
memset (rt, '\0', sizeof (struct rtentry));
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 0
ptr = strtok (NULL, delims); /* reference count */
ptr = strtok (NULL, delims); /* useage count */
ptr = strtok (NULL, delims); /* metric */
ptr = strtok (NULL, delims); /* mask */
#endif
((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) {
syslog (LOG_ERR,
"ppp not replacing existing default route to %s[%s]",
rt.rt_dev,
inet_ntoa (((struct sockaddr_in *) &rt.rt_gateway)->
sin_addr.s_addr));
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 (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(s, SIOCADDRT, &rt) < 0) {
syslog (LOG_ERR, "default route ioctl(SIOCADDRT): %m");
return 0;
}
return 1;
}
/*
* cifdefaultroute - delete a default route through the address given.
*/
int cifdefaultroute (int unit, int gateway)
{
struct rtentry 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(s, SIOCDELRT, &rt) < 0) {
syslog (LOG_ERR, "default route ioctl(SIOCDELRT): %m");
return 0;
}
return 1;
}
/*
* sifproxyarp - Make a proxy ARP entry for the peer.
*/
int sifproxyarp (int unit, u_long his_adr)
{
struct arpreq arpreq;
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)) {
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(s, SIOCSARP, (caddr_t)&arpreq) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
return 0;
}
return 1;
}
/*
* cifproxyarp - Delete the proxy ARP entry for the peer.
*/
int cifproxyarp (int unit, u_long his_adr)
{
struct arpreq arpreq;
memset (&arpreq, '\0', sizeof(arpreq));
SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
if (ioctl(s, SIOCDARP, (caddr_t)&arpreq) < 0) {
syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
return 0;
}
return 1;
}
/*
* get_ether_addr - get the hardware address of an interface on the
* the same subnet as ipaddr.
*/
int get_ether_addr (u_long ipaddr, struct sockaddr *hwaddr)
{
struct ifreq *ifr, *ifend, *ifp;
int i;
u_long ina, mask;
struct sockaddr_dl *dla;
struct ifreq ifreq;
struct ifconf ifc;
struct ifreq ifs[MAX_IFS];
ifc.ifc_len = sizeof(ifs);
ifc.ifc_req = ifs;
if (ioctl(s, 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
* or loopback.
*/
if (ioctl(s, 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(s, 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;
syslog(LOG_INFO, "found interface %s for proxy arp", ifreq.ifr_name);
/*
* Now get the hardware address.
*/
if (ioctl (s, SIOCGIFHWADDR, &ifreq) < 0) {
syslog(LOG_ERR, "SIOCGIFHWADDR(%s): %m", ifreq.ifr_name);
return 0;
}
hwaddr->sa_family = ARPHRD_ETHER;
#ifndef old_ifr_hwaddr
memcpy (&hwaddr->sa_data, &ifreq.ifr_hwaddr, ETH_ALEN);
#else
memcpy (&hwaddr->sa_data, &ifreq.ifr_hwaddr.sa_data, ETH_ALEN);
#endif
MAINDEBUG ((LOG_DEBUG,
"proxy arp: found hwaddr %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]));
return 1;
}
/*
* 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, ok;
struct ifreq ifr;
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
return 1; /* can't tell - maybe we're not root */
strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
close(s);
return ok;
}
int
logwtmp(line, name, host)
char *line, *name, *host;
{
struct utmp ut;
memset (&ut, 0, sizeof (ut));
(void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
(void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
(void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
(void)time(&ut.ut_time);
pututline (&ut); /* Write the line to the proper place */
endutent(); /* Indicate operation is complete */
}