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#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
#include "ip.h"
#include "kernel.h"
#include "ppp.h"
static void pppreader(void *a);
static void pppbind(Ipifc *ifc, int argc, char **argv);
static void pppunbind(Ipifc *ifc);
static void pppbwrite(Ipifc *ifc, Block *bp, int version, uchar *ip);
static void deadremote(Ipifc *ifc);
Medium pppmedium =
{
.name= "ppp",
.hsize= 4,
.mintu= Minmtu,
.maxtu= Maxmtu,
.maclen= 0,
.bind= pppbind,
.unbind= pppunbind,
.bwrite= pppbwrite,
.unbindonclose= 0, /* don't unbind on last close */
};
/*
* called to bind an IP ifc to an ethernet device
* called with ifc wlock'd
*/
static void
pppbind(Ipifc *ifc, int argc, char **argv)
{
PPP *ppp;
Ipaddr ipaddr, remip;
int mtu, framing;
char *chapname, *secret;
if(argc < 3)
error(Ebadarg);
ipmove(ipaddr, IPnoaddr);
ipmove(remip, IPnoaddr);
mtu = Defmtu;
framing = 1;
chapname = nil;
secret = nil;
switch(argc){
default:
case 9:
if(argv[8][0] != '-')
secret = argv[8];
case 8:
if(argv[7][0] != '-')
chapname = argv[7];
case 7:
if(argv[6][0] != '-')
framing = strtoul(argv[6], 0, 0);
case 6:
if(argv[5][0] != '-')
mtu = strtoul(argv[5], 0, 0);
case 5:
if(argv[4][0] != '-')
parseip(remip, argv[4]);
case 4:
if(argv[3][0] != '-')
parseip(ipaddr, argv[3]);
case 3:
break;
}
ppp = smalloc(sizeof(*ppp));
ppp->ifc = ifc;
ppp->f = ifc->conv->p->f;
ifc->arg = ppp;
if(waserror()){
pppunbind(ifc);
nexterror();
}
if(pppopen(ppp, argv[2], ipaddr, remip, mtu, framing, chapname, secret) == nil)
error("ppp open failed");
poperror();
kproc("pppreader", pppreader, ifc, KPDUPPG|KPDUPFDG);
}
static void
pppreader(void *a)
{
Ipifc *ifc;
Block *bp;
PPP *ppp;
ifc = a;
ppp = ifc->arg;
ppp->readp = up; /* hide identity under a rock for unbind */
setpri(PriHi);
if(waserror()){
netlog(ppp->f, Logppp, "pppreader: %I: %s\n", ppp->local, up->env->errstr);
ppp->readp = 0;
deadremote(ifc);
pexit("hangup", 1);
}
for(;;){
bp = pppread(ppp);
if(bp == nil)
error("hungup");
if(!canrlock(ifc)){
freeb(bp);
continue;
}
if(waserror()){
runlock(ifc);
nexterror();
}
ifc->in++;
if(ifc->lifc == nil)
freeb(bp);
else
ipiput(ppp->f, ifc, bp);
runlock(ifc);
poperror();
}
}
/*
* called with ifc wlock'd
*/
static void
pppunbind(Ipifc *ifc)
{
PPP *ppp = ifc->arg;
if(ppp == nil)
return;
if(ppp->readp)
postnote(ppp->readp, 1, "unbind", 0);
if(ppp->timep)
postnote(ppp->timep, 1, "unbind", 0);
/* wait for kprocs to die */
while(ppp->readp != 0 || ppp->timep != 0)
tsleep(&up->sleep, return0, 0, 300);
pppclose(ppp);
qclose(ifc->conv->eq);
ifc->arg = nil;
}
/*
* called by ipoput with a single packet to write with ifc rlock'd
*/
static void
pppbwrite(Ipifc *ifc, Block *bp, int, uchar*)
{
PPP *ppp = ifc->arg;
pppwrite(ppp, bp);
ifc->out++;
}
/*
* If the other end hangs up, we have to unbind the interface. An extra
* unbind (in the case where we are hanging up) won't do any harm.
*/
static void
deadremote(Ipifc *ifc)
{
int fd;
char path[128];
PPP *ppp;
ppp = ifc->arg;
snprint(path, sizeof path, "#I%d/ipifc/%d/ctl", ppp->f->dev, ifc->conv->x);
fd = kopen(path, ORDWR);
if(fd < 0)
return;
kwrite(fd, "unbind", sizeof("unbind")-1);
kclose(fd);
}
void
pppmediumlink(void)
{
addipmedium(&pppmedium);
}
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