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831 lines
20 KiB
C
831 lines
20 KiB
C
/*
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* sys-linux.c - System-dependent procedures for setting up
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* PPP interfaces on Linux systems
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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* TODO:
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*/
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#include <stdio.h>
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#include <syslog.h>
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#include <string.h>
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#include <time.h>
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#include <memory.h>
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#include <utmp.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/errno.h>
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#include <mntent.h>
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#include <net/if.h>
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#include <linux/ppp.h>
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#include <linux/route.h>
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#include <linux/if_ether.h>
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#include <netinet/in.h>
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#include <signal.h>
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#include "pppd.h"
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#include "ppp.h"
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#include "fsm.h"
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#include "ipcp.h"
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static int initdisc = -1; /* Initial TTY discipline */
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static int prev_kdebugflag = 0;
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extern int kdebugflag;
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extern u_long netmask;
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#define MAX_IFS 32
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/* prototypes */
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void die __ARGS((int));
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/*
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* SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
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* if it exists.
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*/
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#define SET_SA_FAMILY(addr, family) \
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memset ((char *) &(addr), '\0', sizeof(addr)); \
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addr.sa_family = (family);
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/*
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* set_kdebugflag - Define the debugging level for the kernel
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*/
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int set_kdebugflag (int requested_level)
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{
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if (ioctl(fd, PPPIOCGDEBUG, &prev_kdebugflag) < 0) {
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syslog(LOG_ERR, "ioctl(PPPIOCGDEBUG): %m");
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return (0);
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}
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if (prev_kdebugflag != requested_level) {
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if (ioctl(fd, PPPIOCSDEBUG, &requested_level) < 0) {
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syslog (LOG_ERR, "ioctl(PPPIOCSDEBUG): %m");
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return (0);
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}
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syslog(LOG_INFO, "set kernel debugging level to %d", requested_level);
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}
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return (1);
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}
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/*
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* establish_ppp - Turn the serial port into a ppp interface.
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*/
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void establish_ppp (void)
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{
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int pppdisc = N_PPP;
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int sig = SIGIO;
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if (ioctl(fd, PPPIOCSINPSIG, &sig) == -1) {
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syslog(LOG_ERR, "ioctl(PPPIOCSINPSIG): %m");
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die(1);
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}
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if (ioctl(fd, TIOCEXCL, 0) < 0) {
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syslog (LOG_WARNING, "ioctl(TIOCEXCL): %m");
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}
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if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
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syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
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die (1);
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}
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if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
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syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
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die (1);
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}
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if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
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syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
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die (1);
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}
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set_kdebugflag (kdebugflag);
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}
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/*
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* disestablish_ppp - Restore the serial port to normal operation.
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* This shouldn't call die() because it's called from die().
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*/
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void disestablish_ppp(void)
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{
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int x;
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char *s;
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if (initdisc >= 0) {
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set_kdebugflag (prev_kdebugflag);
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/*
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* Check whether the link seems not to be 8-bit clean.
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*/
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if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
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s = NULL;
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switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
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case SC_RCV_B7_0:
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s = "bit 7 set to 1";
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break;
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case SC_RCV_B7_1:
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s = "bit 7 set to 0";
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break;
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case SC_RCV_EVNP:
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s = "odd parity";
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break;
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case SC_RCV_ODDP:
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s = "even parity";
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break;
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}
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if (s != NULL) {
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syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
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syslog(LOG_WARNING, "All received characters had %s", s);
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}
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}
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if (ioctl(fd, TIOCSETD, &initdisc) < 0)
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syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
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if (ioctl(fd, TIOCNXCL, 0) < 0)
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syslog (LOG_WARNING, "ioctl(TIOCNXCL): %m");
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initdisc = -1;
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}
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}
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/*
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* output - Output PPP packet.
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*/
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void output (int unit, unsigned char *p, int len)
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{
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if (unit != 0)
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MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
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if (debug)
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log_packet(p, len, "sent ");
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if (write(fd, p, len) < 0) {
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syslog(LOG_ERR, "write: %m");
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die(1);
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}
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}
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/*
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* read_packet - get a PPP packet from the serial device.
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*/
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int read_packet (unsigned char *buf)
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{
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int len;
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len = read(fd, buf, MTU + DLLHEADERLEN);
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if (len < 0) {
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if (errno == EWOULDBLOCK) {
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#if 0
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MAINDEBUG((LOG_DEBUG, "read(fd): EWOULDBLOCK"));
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#endif
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return -1;
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}
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syslog(LOG_ERR, "read(fd): %m");
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die(1);
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}
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return len;
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}
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/*
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* ppp_send_config - configure the transmit characteristics of
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* the ppp interface.
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*/
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void ppp_send_config (int unit,int mtu,u_long asyncmap,int pcomp,int accomp)
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{
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u_int x;
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struct ifreq ifr;
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MAINDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
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strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
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ifr.ifr_mtu = mtu;
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if (ioctl(s, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
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quit();
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}
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MAINDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
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if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
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syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
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quit();
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}
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if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
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syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
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quit();
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}
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x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
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x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
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MAINDEBUG ((LOG_DEBUG, "send_config: flags = %x\n", x));
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if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
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syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
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quit();
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}
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}
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/*
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* ppp_set_xaccm - set the extended transmit ACCM for the interface.
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*/
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void
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ppp_set_xaccm(unit, accm)
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int unit;
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ext_accm accm;
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{
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MAINDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
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accm[0], accm[1], accm[2], accm[3]));
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if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
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syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
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}
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/*
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* ppp_recv_config - configure the receive-side characteristics of
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* the ppp interface.
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*/
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void ppp_recv_config (int unit,int mru,u_long asyncmap,int pcomp,int accomp)
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{
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u_int x;
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MAINDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
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if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
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syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
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MAINDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
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if (ioctl(fd, PPPIOCRASYNCMAP, (caddr_t) &asyncmap) < 0) {
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syslog(LOG_ERR, "ioctl(PPPIOCRASYNCMAP): %m");
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quit();
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}
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if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
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syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
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quit();
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}
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x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
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MAINDEBUG ((LOG_DEBUG, "recv_config: flags = %x\n", x));
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if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
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syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
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quit();
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}
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}
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/*
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* sifvjcomp - config tcp header compression
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*/
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int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
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{
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u_int x;
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if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
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syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
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return 0;
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}
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x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
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x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
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if(ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
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syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
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return 0;
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}
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if (vjcomp) {
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if (ioctl (fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
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syslog (LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
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return 0;
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}
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}
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return 1;
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}
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/*
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* sifup - Config the interface up and enable IP packets to pass.
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*/
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int sifup (int u)
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{
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struct ifreq ifr;
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strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
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if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
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return 0;
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}
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ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
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if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
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return 0;
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}
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return 1;
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}
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/*
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* sifdown - Config the interface down and disable IP.
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*/
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int sifdown (int u)
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{
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struct ifreq ifr;
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strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
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if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
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return 0;
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}
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ifr.ifr_flags &= ~IFF_UP;
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ifr.ifr_flags |= IFF_POINTOPOINT;
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if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
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syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
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return 0;
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}
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return 1;
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}
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/*
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* sifaddr - Config the interface IP addresses and netmask.
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*/
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int sifaddr (int unit, int our_adr, int his_adr, int net_mask)
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{
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struct ifreq ifr;
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struct rtentry rt;
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SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
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SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
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SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
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strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
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/*
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* Set our IP address
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*/
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((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = our_adr;
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if (ioctl(s, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
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if (errno != EEXIST)
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syslog (LOG_ERR, "ioctl(SIOCAIFADDR): %m");
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else
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syslog (LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
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return (0);
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}
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/*
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* Set the gateway address
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*/
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((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = his_adr;
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if (ioctl(s, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
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syslog (LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m");
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return (0);
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}
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/*
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* Set the netmask
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*/
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if (net_mask != 0) {
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((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = net_mask;
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if (ioctl(s, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
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syslog (LOG_ERR, "ioctl(SIOCSIFNETMASK): %m");
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return (0);
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}
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}
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/*
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* Add the device route
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*/
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memset (&rt, '\0', sizeof (rt));
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SET_SA_FAMILY (rt.rt_dst, AF_INET);
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SET_SA_FAMILY (rt.rt_gateway, AF_INET);
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rt.rt_dev = ifname; /* MJC */
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((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
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((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
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rt.rt_flags = RTF_UP | RTF_HOST;
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if (ioctl(s, SIOCADDRT, &rt) < 0) {
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syslog (LOG_ERR, "ioctl(SIOCADDRT) device route: %m");
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return (0);
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}
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return 1;
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}
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|
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/*
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* cifaddr - Clear the interface IP addresses, and delete routes
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* through the interface if possible.
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*/
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int cifaddr (int unit, int our_adr, int his_adr)
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{
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struct rtentry rt;
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/*
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* Delete the route through the device
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*/
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memset (&rt, '\0', sizeof (rt));
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SET_SA_FAMILY (rt.rt_dst, AF_INET);
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SET_SA_FAMILY (rt.rt_gateway, AF_INET);
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rt.rt_dev = ifname; /* MJC */
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((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
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((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
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rt.rt_flags = RTF_UP | RTF_HOST;
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if (ioctl(s, SIOCDELRT, &rt) < 0) {
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syslog (LOG_ERR, "ioctl(SIOCDELRT) device route: %m");
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return (0);
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}
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return 1;
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}
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|
|
/*
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* path_to_route - determine the path to the proc file system data
|
|
*/
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|
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FILE *route_fd = (FILE *) 0;
|
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static char route_buffer [100];
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static char *path_to_route (void);
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static int open_route_table (void);
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static void close_route_table (void);
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static int read_route_table (struct rtentry *rt);
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static int defaultroute_exists (void);
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|
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/*
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* path_to_route - find the path to the route tables in the proc file system
|
|
*/
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|
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static char *path_to_route (void)
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{
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struct mntent *mntent;
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FILE *fp;
|
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fp = fopen (MOUNTED, "r");
|
|
if (fp != 0) {
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while ((mntent = getmntent (fp)) != 0) {
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if (strcmp (mntent->mnt_type, MNTTYPE_IGNORE) == 0)
|
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continue;
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|
|
if (strcmp (mntent->mnt_type, "proc") == 0) {
|
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strncpy (route_buffer, mntent->mnt_dir,
|
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sizeof (route_buffer)-10);
|
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route_buffer [sizeof (route_buffer)-10] = '\0';
|
|
strcat (route_buffer, "/net/route");
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|
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fclose (fp);
|
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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 */
|
|
}
|