479 lines
11 KiB
C
479 lines
11 KiB
C
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/*
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* sys-bsd.c - System-dependent procedures for setting up
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* PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.)
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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 <syslog.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 <net/if.h>
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#include <net/if_ppp.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#include <netinet/in.h>
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#include "pppd.h"
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#include "ppp.h"
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static int initdisc; /* Initial TTY discipline */
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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
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establish_ppp()
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{
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int pppdisc = PPPDISC;
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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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/*
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* Find out which interface we were given.
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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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}
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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
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disestablish_ppp()
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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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}
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/*
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* output - Output PPP packet.
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*/
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void
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output(unit, p, len)
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int unit;
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u_char *p;
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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 (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
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read_packet(buf)
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u_char *buf;
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{
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int len;
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if ((len = read(fd, buf, MTU + DLLHEADERLEN)) < 0) {
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if (errno == EWOULDBLOCK) {
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MAINDEBUG((LOG_DEBUG, "read(fd): EWOULDBLOCK"));
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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
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ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
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int unit, mtu;
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u_long asyncmap;
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int pcomp, accomp;
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{
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u_int x;
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struct ifreq ifr;
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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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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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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_recv_config - configure the receive-side characteristics of
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* the ppp interface. At present this does nothing.
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*/
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void
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ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
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int unit, mru;
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u_long asyncmap;
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int pcomp, accomp;
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{
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#ifdef notyet
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if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
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syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %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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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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#endif /* notyet */
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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
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sifvjcomp(u, vjcomp, cidcomp)
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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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return 1;
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}
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/*
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* sifup - Config the interface up.
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*/
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int
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sifup(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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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.
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*/
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int
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sifdown(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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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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* 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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BZERO((char *) &(addr), sizeof(addr)); \
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addr.sa_family = (family); \
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addr.sa_len = sizeof(addr);
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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
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sifaddr(u, o, h, m)
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{
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struct ifaliasreq ifra;
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strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
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SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
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((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
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SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
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((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
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if (m != 0) {
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SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
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((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
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} else
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BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
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if (ioctl(s, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
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if (errno != EEXIST) {
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syslog(LOG_ERR, "ioctl(SIOCAIFADDR): %m");
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return 0;
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}
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syslog(LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
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}
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return 1;
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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
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cifaddr(u, o, h)
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{
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struct ifaliasreq ifra;
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strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
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SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
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((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
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SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
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((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
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BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
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if (ioctl(s, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
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syslog(LOG_WARNING, "ioctl(SIOCDIFADDR): %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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* sifdefaultroute - assign a default route through the address given.
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*/
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int
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sifdefaultroute(u, g)
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{
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struct ortentry 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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((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
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rt.rt_flags = RTF_GATEWAY;
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if (ioctl(s, SIOCADDRT, &rt) < 0) {
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syslog(LOG_ERR, "default route ioctl(SIOCADDRT): %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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* cifdefaultroute - delete a default route through the address given.
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*/
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int
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cifdefaultroute(u, g)
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{
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struct ortentry 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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((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
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rt.rt_flags = RTF_GATEWAY;
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if (ioctl(s, SIOCDELRT, &rt) < 0)
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syslog(LOG_WARNING, "default route ioctl(SIOCDELRT): %m");
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}
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/*
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* sifproxyarp - Make a proxy ARP entry for the peer.
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*/
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int
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sifproxyarp(unit, hisaddr)
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int unit;
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u_long hisaddr;
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{
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struct arpreq arpreq;
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BZERO(&arpreq, sizeof(arpreq));
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/*
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* Get the hardware address of an interface on the same subnet
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* as our local address.
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*/
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if (!get_ether_addr(hisaddr, &arpreq.arp_ha)) {
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syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
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return 0;
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}
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SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
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((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
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arpreq.arp_flags = ATF_PERM | ATF_PUBL;
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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(unit, hisaddr)
|
||
|
|
int unit;
|
||
|
|
u_long hisaddr;
|
||
|
|
{
|
||
|
|
struct arpreq arpreq;
|
||
|
|
|
||
|
|
BZERO(&arpreq, sizeof(arpreq));
|
||
|
|
SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
|
||
|
|
((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
|
||
|
|
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.
|
||
|
|
*/
|
||
|
|
#define MAX_IFS 32
|
||
|
|
|
||
|
|
int
|
||
|
|
get_ether_addr(ipaddr, hwaddr)
|
||
|
|
u_long ipaddr;
|
||
|
|
struct sockaddr *hwaddr;
|
||
|
|
{
|
||
|
|
struct ifreq *ifr, *ifend, *ifp;
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Scan through looking for an interface with an Internet
|
||
|
|
* address on the same subnet as `ipaddr'.
|
||
|
|
*/
|
||
|
|
ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
|
||
|
|
for (ifr = ifc.ifc_req; ifr < ifend; ) {
|
||
|
|
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));
|
||
|
|
/*
|
||
|
|
* 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 *) &ifr->ifr_addr)->sin_addr.s_addr;
|
||
|
|
if ((ipaddr & mask) != (ina & mask))
|
||
|
|
continue;
|
||
|
|
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (ifr >= ifend)
|
||
|
|
return 0;
|
||
|
|
syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Now scan through again looking for a link-level address
|
||
|
|
* for this interface.
|
||
|
|
*/
|
||
|
|
ifp = ifr;
|
||
|
|
for (ifr = ifc.ifc_req; ifr < ifend; ) {
|
||
|
|
if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
|
||
|
|
&& ifr->ifr_addr.sa_family == AF_LINK) {
|
||
|
|
/*
|
||
|
|
* Found the link-level address - copy it out
|
||
|
|
*/
|
||
|
|
dla = (struct sockaddr_dl *)&ifr->ifr_addr;
|
||
|
|
hwaddr->sa_len = sizeof(struct sockaddr);
|
||
|
|
hwaddr->sa_family = AF_UNSPEC;
|
||
|
|
BCOPY(LLADDR(dla), hwaddr->sa_data, dla->sdl_alen);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|