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

731 lines
17 KiB
C

/*
* sys-str.c - System-dependent procedures for setting up
* PPP interfaces on systems which use the STREAMS ppp interface.
*
* 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 <errno.h>
#include <syslog.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
#include <utmp.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/stream.h>
#include <sys/stropts.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_arp.h>
#include <netinet/in.h>
#include "pppd.h"
#include "ppp.h"
#include <net/ppp_str.h>
#ifndef ifr_mtu
#define ifr_mtu ifr_metric
#endif
#define MAXMODULES 10 /* max number of module names to save */
static struct modlist {
char modname[FMNAMESZ+1];
} str_modules[MAXMODULES];
static int str_module_count = 0;
static int pushed_ppp;
extern int hungup; /* has the physical layer been disconnected? */
extern int kdebugflag;
#define PAI_FLAGS_B7_0 0x100
#define PAI_FLAGS_B7_1 0x200
#define PAI_FLAGS_PAR_EVEN 0x400
#define PAI_FLAGS_PAR_ODD 0x800
#define PAI_FLAGS_HIBITS 0xF00
/*
* ppp_available - check if this kernel supports PPP.
*/
int
ppp_available()
{
int fd, ret;
fd = open("/dev/tty", O_RDONLY, 0);
if (fd < 0)
return 1; /* can't find out - assume we have ppp */
ret = ioctl(fd, I_FIND, "pppasync") >= 0;
close(fd);
return ret;
}
/*
* establish_ppp - Turn the serial port into a ppp interface.
*/
void
establish_ppp()
{
/* go through and save the name of all the modules, then pop em */
for (;;) {
if (ioctl(fd, I_LOOK, str_modules[str_module_count].modname) < 0 ||
ioctl(fd, I_POP, 0) < 0)
break;
MAINDEBUG((LOG_DEBUG, "popped stream module : %s",
str_modules[str_module_count].modname));
str_module_count++;
}
/* now push the async/fcs module */
if (ioctl(fd, I_PUSH, "pppasync") < 0) {
syslog(LOG_ERR, "ioctl(I_PUSH, ppp_async): %m");
die(1);
}
/* finally, push the ppp_if module that actually handles the */
/* network interface */
if (ioctl(fd, I_PUSH, "pppif") < 0) {
syslog(LOG_ERR, "ioctl(I_PUSH, ppp_if): %m");
die(1);
}
pushed_ppp = 1;
if (ioctl(fd, I_SETSIG, S_INPUT) < 0) {
syslog(LOG_ERR, "ioctl(I_SETSIG, S_INPUT): %m");
die(1);
}
/* read mode, message non-discard mode */
if (ioctl(fd, I_SRDOPT, RMSGN) < 0) {
syslog(LOG_ERR, "ioctl(I_SRDOPT, RMSGN): %m");
die(1);
}
/* Flush any waiting messages, or we'll never get SIGPOLL */
if (ioctl(fd, I_FLUSH, FLUSHRW) < 0) {
syslog(LOG_ERR, "ioctl(I_FLUSH, FLUSHRW): %m");
die(1);
}
/*
* Find out which interface we were given.
* (ppp_if handles this ioctl)
*/
if (ioctl(fd, SIOCGETU, &ifunit) < 0) {
syslog(LOG_ERR, "ioctl(SIOCGETU): %m");
die(1);
}
/* Set debug flags in driver */
if (ioctl(fd, SIOCSIFDEBUG, &kdebugflag) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFDEBUG): %m");
}
}
/*
* disestablish_ppp - Restore the serial port to normal operation.
* It attempts to reconstruct the stream with the previously popped
* modules. This shouldn't call die() because it's called from die().
*/
void
disestablish_ppp()
{
int flags;
char *s;
if (hungup) {
/* we can't push or pop modules after the stream has hung up */
str_module_count = 0;
return;
}
if (pushed_ppp) {
/*
* Check whether the link seems not to be 8-bit clean.
*/
if (ioctl(fd, SIOCGIFDEBUG, (caddr_t) &flags) == 0) {
s = NULL;
switch (~flags & PAI_FLAGS_HIBITS) {
case PAI_FLAGS_B7_0:
s = "bit 7 set to 1";
break;
case PAI_FLAGS_B7_1:
s = "bit 7 set to 0";
break;
case PAI_FLAGS_PAR_EVEN:
s = "odd parity";
break;
case PAI_FLAGS_PAR_ODD:
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);
}
}
}
while (ioctl(fd, I_POP, 0) == 0) /* pop any we pushed */
;
pushed_ppp = 0;
for (; str_module_count > 0; str_module_count--) {
if (ioctl(fd, I_PUSH, str_modules[str_module_count-1].modname)) {
syslog(LOG_WARNING, "str_restore: couldn't push module %s: %m",
str_modules[str_module_count-1].modname);
} else {
MAINDEBUG((LOG_INFO, "str_restore: pushed module %s",
str_modules[str_module_count-1].modname));
}
}
}
/*
* output - Output PPP packet.
*/
void
output(unit, p, len)
int unit;
u_char *p;
int len;
{
struct strbuf str;
if (unit != 0)
MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
if (debug)
log_packet(p, len, "sent ");
str.len = len;
str.buf = (caddr_t) p;
if(putmsg(fd, NULL, &str, 0) < 0) {
syslog(LOG_ERR, "putmsg: %m");
die(1);
}
}
/*
* read_packet - get a PPP packet from the serial device.
*/
int
read_packet(buf)
u_char *buf;
{
struct strbuf str;
int len, i;
str.maxlen = MTU+DLLHEADERLEN;
str.buf = (caddr_t) buf;
i = 0;
len = getmsg(fd, NULL, &str, &i);
if (len < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
return -1;
}
syslog(LOG_ERR, "getmsg(fd) %m");
die(1);
}
if (len)
MAINDEBUG((LOG_DEBUG, "getmsg returned 0x%x",len));
if (str.len < 0) {
MAINDEBUG((LOG_DEBUG, "getmsg short return length %d", str.len));
return -1;
}
return str.len;
}
/*
* ppp_send_config - configure the transmit characteristics of
* the ppp interface.
*/
void
ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
int unit, mtu;
u_long asyncmap;
int pcomp, accomp;
{
char c;
struct ifreq ifr;
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();
}
if(ioctl(fd, SIOCSIFASYNCMAP, (caddr_t) &asyncmap) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFASYNCMAP): %m");
quit();
}
c = (pcomp? 1: 0);
if(ioctl(fd, SIOCSIFCOMPPROT, &c) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFCOMPPROT): %m");
quit();
}
c = (accomp? 1: 0);
if(ioctl(fd, SIOCSIFCOMPAC, &c) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFCOMPAC): %m");
quit();
}
}
/*
* ppp_set_xaccm - set the extended transmit ACCM for the interface.
*/
void
ppp_set_xaccm(unit, accm)
int unit;
ext_accm accm;
{
if (ioctl(fd, SIOCSIFXASYNCMAP, 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(unit, mru, asyncmap, pcomp, accomp)
int unit, mru;
u_long asyncmap;
int pcomp, accomp;
{
char c;
if (ioctl(fd, SIOCSIFMRU, &mru) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFMRU): %m");
}
if (ioctl(fd, SIOCSIFRASYNCMAP, (caddr_t) &asyncmap) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFRASYNCMAP): %m");
}
c = 2 + (pcomp? 1: 0);
if(ioctl(fd, SIOCSIFCOMPPROT, &c) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFCOMPPROT): %m");
}
c = 2 + (accomp? 1: 0);
if (ioctl(fd, SIOCSIFCOMPAC, &c) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFCOMPAC): %m");
}
}
/*
* sifvjcomp - config tcp header compression
*/
int
sifvjcomp(u, vjcomp, cidcomp, maxcid)
int u, vjcomp, cidcomp, maxcid;
{
char x;
x = (vjcomp? 1: 0) + (cidcomp? 0: 2) + (maxcid << 4);
if (ioctl(fd, SIOCSIFVJCOMP, (caddr_t) &x) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFVJCOMP): %m");
return 0;
}
return 1;
}
/*
* sifup - Config the interface up.
*/
int
sifup(u)
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;
if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
return 0;
}
return 1;
}
/*
* sifdown - Config the interface down.
*/
int
sifdown(u)
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;
if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
return 0;
}
return 1;
}
/*
* SET_SA_FAMILY - initialize a struct sockaddr, setting the sa_family field.
*/
#define SET_SA_FAMILY(addr, family) \
BZERO((char *) &(addr), sizeof(addr)); \
addr.sa_family = (family);
/*
* sifaddr - Config the interface IP addresses and netmask.
*/
int
sifaddr(u, o, h, m)
int u;
u_long o, h, m;
{
int ret;
struct ifreq ifr;
ret = 1;
strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o;
if (ioctl(s, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFADDR): %m");
ret = 0;
}
((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = h;
if (ioctl(s, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m");
ret = 0;
}
if (m != 0) {
((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = m;
syslog(LOG_INFO, "Setting interface mask to %s\n", ip_ntoa(m));
if (ioctl(s, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
syslog(LOG_ERR, "ioctl(SIOCSIFNETMASK): %m");
ret = 0;
}
}
return ret;
}
/*
* cifaddr - Clear the interface IP addresses, and delete routes
* through the interface if possible.
*/
int
cifaddr(u, o, h)
int u;
u_long o, h;
{
struct rtentry rt;
SET_SA_FAMILY(rt.rt_dst, AF_INET);
((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = h;
SET_SA_FAMILY(rt.rt_gateway, AF_INET);
((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = o;
rt.rt_flags = RTF_HOST;
if (ioctl(s, SIOCDELRT, (caddr_t) &rt) < 0) {
syslog(LOG_ERR, "ioctl(SIOCDELRT): %m");
return 0;
}
return 1;
}
/*
* sifdefaultroute - assign a default route through the address given.
*/
int
sifdefaultroute(u, g)
int u;
u_long g;
{
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 = g;
rt.rt_flags = 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(u, g)
int u;
u_long g;
{
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 = g;
rt.rt_flags = 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(unit, hisaddr)
int unit;
u_long hisaddr;
{
struct arpreq arpreq;
BZERO(&arpreq, sizeof(arpreq));
/*
* Get the hardware address of an interface on the same subnet
* as our local address.
*/
if (!get_ether_addr(hisaddr, &arpreq.arp_ha)) {
syslog(LOG_WARNING, "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 = hisaddr;
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(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_ERR, "ioctl(SIOCDARP): %m");
return 0;
}
return 1;
}
/*
* get_ether_addr - get the hardware address of an interface on the
* the same subnet as ipaddr. Code borrowed from myetheraddr.c
* in the cslip-2.6 distribution, which is subject to the following
* copyright notice (which also applies to logwtmp below):
*
* Copyright (c) 1990, 1992 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may 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
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <fcntl.h>
#include <nlist.h>
#include <kvm.h>
#include <arpa/inet.h>
/* XXX SunOS 4.1 defines this and 3.5 doesn't... */
#ifdef _nlist_h
#define SUNOS4
#endif
#ifdef SUNOS4
#include <netinet/in_var.h>
#endif
#include <netinet/if_ether.h>
/* Cast a struct sockaddr to a structaddr_in */
#define SATOSIN(sa) ((struct sockaddr_in *)(sa))
/* Determine if "bits" is set in "flag" */
#define ALLSET(flag, bits) (((flag) & (bits)) == (bits))
static struct nlist nl[] = {
#define N_IFNET 0
{ "_ifnet" },
{ 0 }
};
static void kread();
int
get_ether_addr(ipaddr, hwaddr)
u_long ipaddr;
struct sockaddr *hwaddr;
{
register kvm_t *kd;
register struct ifnet *ifp;
register struct arpcom *ac;
struct arpcom arpcom;
struct in_addr *inp;
#ifdef SUNOS4
register struct ifaddr *ifa;
register struct in_ifaddr *in;
union {
struct ifaddr ifa;
struct in_ifaddr in;
} ifaddr;
#endif
u_long addr, mask;
/* Open kernel memory for reading */
kd = kvm_open(0, 0, 0, O_RDONLY, NULL);
if (kd == 0) {
syslog(LOG_ERR, "kvm_open: %m");
return 0;
}
/* Fetch namelist */
if (kvm_nlist(kd, nl) != 0) {
syslog(LOG_ERR, "kvm_nlist failed");
return 0;
}
ac = &arpcom;
ifp = &arpcom.ac_if;
#ifdef SUNOS4
ifa = &ifaddr.ifa;
in = &ifaddr.in;
#endif
if (kvm_read(kd, nl[N_IFNET].n_value, (char *)&addr, sizeof(addr))
!= sizeof(addr)) {
syslog(LOG_ERR, "error reading ifnet addr");
return 0;
}
for ( ; addr; addr = (u_long)ifp->if_next) {
if (kvm_read(kd, addr, (char *)ac, sizeof(*ac)) != sizeof(*ac)) {
syslog(LOG_ERR, "error reading ifnet");
return 0;
}
/* Only look at configured, broadcast interfaces */
if (!ALLSET(ifp->if_flags, IFF_UP | IFF_BROADCAST))
continue;
#ifdef SUNOS4
/* This probably can't happen... */
if (ifp->if_addrlist == 0)
continue;
#endif
/* Get interface ip address */
#ifdef SUNOS4
if (kvm_read(kd, (u_long)ifp->if_addrlist, (char *)&ifaddr,
sizeof(ifaddr)) != sizeof(ifaddr)) {
syslog(LOG_ERR, "error reading ifaddr");
return 0;
}
inp = &SATOSIN(&ifa->ifa_addr)->sin_addr;
#else
inp = &SATOSIN(&ifp->if_addr)->sin_addr;
#endif
/* Check if this interface on the right subnet */
#ifdef SUNOS4
mask = in->ia_subnetmask;
#else
mask = ifp->if_subnetmask;
#endif
if ((ipaddr & mask) != (inp->s_addr & mask))
continue;
/* Copy out the local ethernet address */
hwaddr->sa_family = AF_UNSPEC;
BCOPY((caddr_t) &arpcom.ac_enaddr, hwaddr->sa_data,
sizeof(arpcom.ac_enaddr));
return 1; /* success! */
}
/* couldn't find one */
return 0;
}
#define WTMPFILE "/usr/adm/wtmp"
int
logwtmp(line, name, host)
char *line, *name, *host;
{
int fd;
struct stat buf;
struct utmp ut;
if ((fd = open(WTMPFILE, O_WRONLY|O_APPEND, 0)) < 0)
return;
if (!fstat(fd, &buf)) {
(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);
if (write(fd, (char *)&ut, sizeof(struct utmp)) != sizeof(struct utmp))
(void)ftruncate(fd, buf.st_size);
}
close(fd);
}