ref: dfb4b522830edab8f3856289d326d6cf5e930644
dir: /sys/src/cmd/ip/ppp/ppp.c/
/*
* ppp - point-to-point protocol, rfc1331
*/
#include <u.h>
#include <libc.h>
#include <auth.h>
#include <bio.h>
#include <ip.h>
#include <libsec.h>
#include <ndb.h>
#include "ppp.h"
#define PATH 128
static int baud;
static int nocompress;
static int pppframing = 1;
static int noipcompress;
static int server;
static int noauth;
static int dying; /* flag to signal to all threads its time to go */
static int primary;
static int proxy;
static char *chatfile;
int debug;
char* LOG = "ppp";
char* keyspec = "";
/*
* Calculate FCS - rfc 1331
*/
ushort fcstab[256] =
{
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
static char *snames[] =
{
"Sclosed",
"Sclosing",
"Sreqsent",
"Sackrcvd",
"Sacksent",
"Sopened",
};
static void authtimer(PPP*);
static void chapinit(PPP*);
static void config(PPP*, Pstate*, int);
static int euitov6(Ipaddr, uchar*, int);
static uchar* escapeuchar(PPP*, ulong, uchar*, ushort*);
static void getchap(PPP*, Block*);
static Block* getframe(PPP*, int*);
static void getlqm(PPP*, Block*);
static int getopts(PPP*, Pstate*, Block*);
static void getpap(PPP*, Block*);
static void init(PPP*);
static void invalidate(Ipaddr);
static void ipinproc(PPP*);
static char* ipopen(PPP*);
static void mediainproc(PPP*);
static void newstate(PPP*, Pstate*, int);
static void papinit(PPP*);
static void pinit(PPP*, Pstate*);
static void ppptimer(PPP*);
static void printopts(Pstate*, Block*, int);
static void ptimer(PPP*, Pstate*);
static int putframe(PPP*, int, Block*);
static void putlqm(PPP*);
static void putpaprequest(PPP*);
static void rcv(PPP*, Pstate*, Block*);
static void rejopts(PPP*, Pstate*, Block*, int);
static void sendechoreq(PPP*, Pstate*);
static void sendtermreq(PPP*, Pstate*);
static void setphase(PPP*, int);
static void terminate(PPP*, char*, int);
static int validv4(Ipaddr);
static int validv6(Ipaddr);
static void dmppkt(char *s, uchar *a, int na);
void
pppopen(PPP *ppp, int mediain, int mediaout, int shellin, char *net, char *dev,
Ipaddr ipaddr[2], Ipaddr remip[2],
int mtu, int framing, char *duid)
{
int i;
ppp->ipfd = -1;
invalidate(ppp->remote);
invalidate(ppp->local);
invalidate(ppp->curremote);
invalidate(ppp->curlocal);
invalidate(ppp->dns[0]);
invalidate(ppp->dns[1]);
invalidate(ppp->wins[0]);
invalidate(ppp->wins[1]);
invalidate(ppp->local6);
invalidate(ppp->remote6);
invalidate(ppp->curremote6);
invalidate(ppp->curlocal6);
ppp->dev = dev;
ppp->duid = duid;
ppp->mediain = mediain;
ppp->mediaout = mediaout;
ppp->shellin = shellin;
for(i=0; i<2; i++){
if(validv4(ipaddr[i])){
ipmove(ppp->local, ipaddr[i]);
ppp->localfrozen = 1;
} else if(validv6(ipaddr[i])){
ipmove(ppp->local6, ipaddr[i]);
ppp->local6frozen = 1;
}
if(validv4(remip[i])){
ipmove(ppp->remote, remip[i]);
ppp->remotefrozen = 1;
} else if(validv6(remip[i])){
ipmove(ppp->remote6, remip[i]);
ppp->remote6frozen = 1;
}
}
ppp->mtu = mtu;
ppp->mru = mtu;
ppp->framing = framing;
ppp->net = net;
init(ppp);
mediainproc(ppp);
terminate(ppp, "mediainproc", 0);
}
static void
init(PPP* ppp)
{
if(ppp->lcp == nil){
/* prevent them from being free'd */
ppp->inbuf[0] = *allocb(Buflen);
ppp->outbuf[0] = *allocb(Buflen);
ppp->lcp = mallocz(sizeof(*ppp->lcp), 1);
ppp->lcp->proto = Plcp;
ppp->lcp->state = Sclosed;
ppp->ccp = mallocz(sizeof(*ppp->ccp), 1);
ppp->ccp->proto = Pccp;
ppp->ccp->state = Sclosed;
ppp->ipcp = mallocz(sizeof(*ppp->ipcp), 1);
ppp->ipcp->proto = Pipcp;
ppp->ipcp->state = Sclosed;
ppp->ipv6cp = mallocz(sizeof(*ppp->ipv6cp), 1);
ppp->ipv6cp->proto = Pipv6cp;
ppp->ipv6cp->state = Sclosed;
ppp->chap = mallocz(sizeof(*ppp->chap), 1);
ppp->chap->proto = APmschapv2;
ppp->chap->state = Cunauth;
auth_freechal(ppp->chap->cs);
ppp->chap->cs = nil;
switch(rfork(RFPROC|RFMEM|RFNOWAIT)){
case -1:
terminate(ppp, "forking ppptimer", 1);
case 0:
ppptimer(ppp);
exits(nil);
}
}
ppp->ctcp = compress_init(ppp->ctcp);
pinit(ppp, ppp->lcp);
setphase(ppp, Plink);
}
static void
setphase(PPP *ppp, int phase)
{
int oldphase;
oldphase = ppp->phase;
ppp->phase = phase;
switch(phase){
default:
terminate(ppp, "phase error", 1);
case Pdead:
terminate(ppp, "protocol", 0);
break;
case Plink:
/* link down */
switch(oldphase) {
case Pauth:
auth_freechal(ppp->chap->cs);
ppp->chap->cs = nil;
ppp->chap->state = Cunauth;
break;
case Pnet:
auth_freechal(ppp->chap->cs);
ppp->chap->cs = nil;
ppp->chap->state = Cunauth;
newstate(ppp, ppp->ccp, Sclosed);
newstate(ppp, ppp->ipcp, Sclosed);
newstate(ppp, ppp->ipv6cp, Sclosed);
}
break;
case Pauth:
if(server) {
chapinit(ppp);
} else {
switch (ppp->chap->proto) {
case APpasswd:
papinit(ppp);
break;
case APmd5:
case APmschap:
case APmschapv2:
break;
default:
setphase(ppp, Pnet);
break;
}
}
break;
case Pnet:
pinit(ppp, ppp->ccp);
pinit(ppp, ppp->ipcp);
pinit(ppp, ppp->ipv6cp);
break;
}
}
static void
pinit(PPP *ppp, Pstate *p)
{
p->timeout = 0;
switch(p->proto){
case Plcp:
ppp->magic = truerand();
ppp->xctlmap = 0xffffffff;
ppp->period = 0;
p->optmask = 0xffffffff;
if(!server)
p->optmask &= ~Fauth;
ppp->rctlmap = 0;
ppp->ipcp->state = Sclosed;
ppp->ipcp->optmask = 0xffffffff;
if(noipcompress) {
p->optmask &= ~Fac;
ppp->ipcp->optmask &= ~Fipaddrs;
}
if(nocompress) {
p->optmask &= ~Fpc;
ppp->ipcp->optmask &= ~Fipcompress;
}
ppp->ipv6cp->state = Sclosed;
ppp->ipv6cp->optmask = 0xffffffff;
p->echoack = 0;
p->echotimeout = 0;
/* quality goo */
ppp->timeout = 0;
memset(&ppp->in, 0, sizeof(ppp->in));
memset(&ppp->out, 0, sizeof(ppp->out));
memset(&ppp->pin, 0, sizeof(ppp->pin));
memset(&ppp->pout, 0, sizeof(ppp->pout));
memset(&ppp->sin, 0, sizeof(ppp->sin));
break;
case Pccp:
if(nocompress)
p->optmask = 0;
else
p->optmask = Fcmppc;
if(ppp->ctype != nil)
(*ppp->ctype->fini)(ppp->cstate);
ppp->ctype = nil;
ppp->ctries = 0;
ppp->cstate = nil;
if(ppp->unctype)
(*ppp->unctype->fini)(ppp->uncstate);
ppp->unctype = nil;
ppp->uncstate = nil;
break;
case Pipcp:
p->optmask = 0xffffffff;
ppp->ctcp = compress_init(ppp->ctcp);
break;
case Pipv6cp:
p->optmask = 0xffffffff;
break;
}
p->confid = p->rcvdconfid = -1;
config(ppp, p, 1);
newstate(ppp, p, Sreqsent);
}
/*
* change protocol to a new state.
*/
static void
newstate(PPP *ppp, Pstate *p, int state)
{
char *err;
netlog("ppp: %ux %s->%s ctlmap %lux/%lux flags %lux mtu %ld mru %ld\n",
p->proto, snames[p->state], snames[state], ppp->rctlmap,
ppp->xctlmap, p->flags,
ppp->mtu, ppp->mru);
syslog(0, LOG, "%ux %s->%s ctlmap %lux/%lux flags %lux mtu %ld mru %ld",
p->proto, snames[p->state], snames[state], ppp->rctlmap,
ppp->xctlmap, p->flags,
ppp->mtu, ppp->mru);
if(p->proto == Plcp) {
if(state == Sopened)
setphase(ppp, noauth? Pnet : Pauth);
else if(state == Sclosed)
setphase(ppp, Pdead);
else if(p->state == Sopened)
setphase(ppp, Plink);
}
if(p->proto == Pccp && state == Sopened) {
if(ppp->unctype)
(*ppp->unctype->fini)(ppp->uncstate);
ppp->unctype = nil;
ppp->uncstate = nil;
if(p->optmask & Fcmppc) {
ppp->unctype = &uncmppc;
ppp->uncstate = (*uncmppc.init)(ppp);
}
if(p->optmask & Fcthwack){
ppp->unctype = &uncthwack;
ppp->uncstate = (*uncthwack.init)(ppp);
}
}
if((p->proto == Pipcp || p->proto == Pipv6cp) && state == Sopened) {
if(server && !noauth && ppp->chap->state != Cauthok)
abort();
err = ipopen(ppp);
if(err != nil)
terminate(ppp, err, 1);
}
p->state = state;
}
/*
* getframe returns (protocol, information)
*/
static Block*
getframe(PPP *ppp, int *protop)
{
uchar *p, *from, *to;
int n, proto;
ulong c;
ushort fcs;
Block *buf, *b;
*protop = 0;
if(ppp->framing == 0) {
/* reuse inbuf to avoid allocation */
b = resetb(ppp->inbuf);
n = read(ppp->mediain, b->wptr, BALLOC(b));
if(n <= 0){
syslog(0, LOG, "medium read returns %d: %r", n);
return nil;
}
dmppkt("RX", b->wptr, n);
b->wptr += n;
if(pppframing && b->rptr[0] == PPP_addr && b->rptr[1] == PPP_ctl)
b->rptr += 2;
proto = *b->rptr++;
if((proto & 0x1) == 0)
proto = (proto<<8) | *b->rptr++;
if(b->rptr >= b->wptr)
return nil;
ppp->in.uchars += n;
ppp->in.packets++;
*protop = proto;
return b;
}
buf = ppp->inbuf;
for(;;){
/* read till we hit a frame uchar or run out of room */
for(p = buf->rptr; buf->wptr < buf->lim;){
for(; p < buf->wptr; p++)
if(*p == HDLC_frame)
break;
if(p != buf->wptr)
break;
n = read(ppp->mediain, buf->wptr, BALLOC(buf));
if(n <= 0){
syslog(0, LOG, "medium read returns %d: %r", n);
buf->wptr = buf->rptr;
return nil;
}
dmppkt("RX", buf->wptr, n);
buf->wptr += n;
}
/* copy into block, undoing escapes, and caculating fcs */
fcs = PPP_initfcs;
b = allocb(p - buf->rptr);
to = b->wptr;
for(from = buf->rptr; from != p;){
c = *from++;
if(c == HDLC_esc){
if(from == p)
break;
c = *from++ ^ 0x20;
} else if((c < 0x20) && (ppp->rctlmap & (1 << c)))
continue;
*to++ = c;
fcs = (fcs >> 8) ^ fcstab[(fcs ^ c) & 0xff];
}
/* copy down what's left in buffer */
p++;
memmove(buf->rptr, p, buf->wptr - p);
n = p - buf->rptr;
buf->wptr -= n;
b->wptr = to - 2;
/* return to caller if checksum matches */
if(fcs == PPP_goodfcs){
if(b->rptr[0] == PPP_addr && b->rptr[1] == PPP_ctl)
b->rptr += 2;
proto = *b->rptr++;
if((proto & 0x1) == 0)
proto = (proto<<8) | *b->rptr++;
if(b->rptr < b->wptr){
ppp->in.uchars += n;
ppp->in.packets++;
*protop = proto;
return b;
}
} else if(BLEN(b) > 0){
if(ppp->ctcp)
compress_error(ppp->ctcp);
ppp->in.discards++;
netlog("ppp: discard len %zd/%zd cksum %ux (%ux %ux %ux %ux)\n",
BLEN(b), BLEN(buf), fcs, b->rptr[0],
b->rptr[1], b->rptr[2], b->rptr[3]);
}
freeb(b);
}
}
/* send a PPP frame */
static int
putframe(PPP *ppp, int proto, Block *b)
{
uchar *to, *from;
ushort fcs;
ulong ctlmap;
uchar c;
ppp->out.packets++;
if(proto == Plcp)
ctlmap = 0xffffffff;
else
ctlmap = ppp->xctlmap;
/* make sure we have head room */
assert(b->rptr - b->base >= 4);
netlog("ppp: putframe 0x%ux %zd\n", proto, BLEN(b));
/* add in the protocol and address, we'd better have left room */
from = b->rptr;
*--from = proto;
if(!(ppp->lcp->flags&Fpc) || proto > 0x100 || proto == Plcp)
*--from = proto>>8;
if(pppframing && (!(ppp->lcp->flags&Fac) || proto == Plcp)){
*--from = PPP_ctl;
*--from = PPP_addr;
}
qlock(&ppp->outlock);
if(ppp->framing == 0)
to = b->wptr;
else {
to = ppp->outbuf->rptr;
/* escape and checksum the body */
fcs = PPP_initfcs;
/* add frame marker */
*to++ = HDLC_frame;
for(; from < b->wptr; from++){
c = *from;
if(c == HDLC_frame || c == HDLC_esc
|| (c < 0x20 && ((1<<c) & ctlmap))){
*to++ = HDLC_esc;
*to++ = c ^ 0x20;
} else
*to++ = c;
fcs = (fcs >> 8) ^ fcstab[(fcs ^ c) & 0xff];
}
/* add on and escape the checksum */
fcs = ~fcs;
c = fcs;
if(c == HDLC_frame || c == HDLC_esc
|| (c < 0x20 && ((1<<c) & ctlmap))){
*to++ = HDLC_esc;
*to++ = c ^ 0x20;
} else
*to++ = c;
c = fcs>>8;
if(c == HDLC_frame || c == HDLC_esc
|| (c < 0x20 && ((1<<c) & ctlmap))){
*to++ = HDLC_esc;
*to++ = c ^ 0x20;
} else
*to++ = c;
/* add frame marker */
*to++ = HDLC_frame;
from = ppp->outbuf->rptr;
}
dmppkt("TX", from, to - from);
if(write(ppp->mediaout, from, to - from) < 0){
qunlock(&ppp->outlock);
return -1;
}
ppp->out.uchars += to - from;
qunlock(&ppp->outlock);
return 0;
}
Block*
alloclcp(int code, int id, int len, Lcpmsg **mp)
{
Block *b;
Lcpmsg *m;
/*
* leave room for header
*/
b = allocb(len);
m = (Lcpmsg*)b->wptr;
m->code = code;
m->id = id;
b->wptr += 4;
*mp = m;
return b;
}
static void
putlo(Block *b, int type, ulong val)
{
*b->wptr++ = type;
*b->wptr++ = 6;
hnputl(b->wptr, val);
b->wptr += 4;
}
static void
putv4o(Block *b, int type, Ipaddr val)
{
*b->wptr++ = type;
*b->wptr++ = 6;
v6tov4(b->wptr, val);
b->wptr += 4;
}
static void
putso(Block *b, int type, ulong val)
{
*b->wptr++ = type;
*b->wptr++ = 4;
hnputs(b->wptr, val);
b->wptr += 2;
}
static void
puto(Block *b, int type)
{
*b->wptr++ = type;
*b->wptr++ = 2;
}
static void
putoeui64(Block *b, int type, uchar data[8])
{
*b->wptr++ = type;
*b->wptr++ = 8+2;
memmove(b->wptr, data, 8);
b->wptr += 8;
}
/*
* send configuration request
*/
static void
config(PPP *ppp, Pstate *p, int newid)
{
Block *b;
Lcpmsg *m;
int id;
if(newid){
id = p->id++;
p->confid = id;
p->timeout = Timeout;
} else
id = p->confid;
b = alloclcp(Lconfreq, id, 256, &m);
USED(m);
switch(p->proto){
case Plcp:
if(p->optmask & Fctlmap)
putlo(b, Octlmap, 0); /* we don't want anything escaped */
if(p->optmask & Fmagic)
putlo(b, Omagic, ppp->magic);
if(p->optmask & Fmtu)
putso(b, Omtu, ppp->mru);
if(p->optmask & Fauth) {
*b->wptr++ = Oauth;
*b->wptr++ = 5;
hnputs(b->wptr, Pchap);
b->wptr += 2;
*b->wptr++ = ppp->chap->proto;
}
if(p->optmask & Fpc)
puto(b, Opc);
if(p->optmask & Fac)
puto(b, Oac);
break;
case Pccp:
if(p->optmask & Fcthwack)
puto(b, Octhwack);
else if(p->optmask & Fcmppc) {
*b->wptr++ = Ocmppc;
*b->wptr++ = 6;
*b->wptr++ = 0;
*b->wptr++ = 0;
*b->wptr++ = 0;
*b->wptr++ = 0x41;
}
break;
case Pipcp:
if(p->optmask & Fipaddr){
syslog(0, LOG, "requesting IPv4 %I", ppp->local);
putv4o(b, Oipaddr, ppp->local);
}
if(p->optmask & Fipdns)
putv4o(b, Oipdns, ppp->dns[0]);
if(p->optmask & Fipdns2)
putv4o(b, Oipdns2, ppp->dns[1]);
if(p->optmask & Fipwins)
putv4o(b, Oipwins, ppp->wins[0]);
if(p->optmask & Fipwins2)
putv4o(b, Oipwins2, ppp->wins[1]);
/*
* don't ask for header compression while data compression is still pending.
* perhaps we should restart ipcp negotiation if compression negotiation fails.
*/
if(!noipcompress && !ppp->ccp->optmask && (p->optmask & Fipcompress)) {
*b->wptr++ = Oipcompress;
*b->wptr++ = 6;
hnputs(b->wptr, Pvjctcp);
b->wptr += 2;
*b->wptr++ = MAX_STATES-1;
*b->wptr++ = 1;
}
break;
case Pipv6cp:
if(p->optmask & Fipv6eui){
syslog(0, LOG, "requesting IPv6 %I", ppp->local6);
putoeui64(b, Oipv6eui, &ppp->local6[8]);
}
break;
}
hnputs(m->len, BLEN(b));
printopts(p, b, 1);
putframe(ppp, p->proto, b);
freeb(b);
}
static void
getipinfo(PPP *ppp)
{
char buf[32];
char *av[3];
int ndns, nwins;
Ndbtuple *t, *nt;
Ipaddr ip;
if(!validv4(ppp->local))
return;
av[0] = "dns";
av[1] = "wins";
snprint(buf, sizeof buf, "%I", ppp->local);
t = csipinfo(ppp->net, "ip", buf, av, 2);
ndns = nwins = 0;
for(nt = t; nt != nil; nt = nt->entry){
if (parseip(ip, nt->val) == -1 || !validv4(ip))
continue;
if(strcmp(nt->attr, "dns") == 0){
if(ndns < 2)
ipmove(ppp->dns[ndns++], ip);
} else if(strcmp(nt->attr, "wins") == 0){
if(nwins < 2)
ipmove(ppp->wins[nwins++], ip);
}
}
if(t != nil)
ndbfree(t);
}
/*
* parse configuration request, sends an ack or reject packet
*
* returns: -1 if request was syntacticly incorrect
* 0 if packet was accepted
* 1 if packet was rejected
*/
static int
getopts(PPP *ppp, Pstate *p, Block *b)
{
Lcpmsg *m, *repm;
Lcpopt *o;
uchar *cp, *ap;
ulong rejecting, nacking, flags, proto, chapproto;
ulong mtu, ctlmap, period;
ulong x;
Block *repb;
Comptype *ctype;
Ipaddr ipaddr, ipaddr6;
rejecting = 0;
nacking = 0;
flags = 0;
/* defaults */
invalidate(ipaddr);
invalidate(ipaddr6);
mtu = ppp->mtu;
ctlmap = 0xffffffff;
period = 0;
ctype = nil;
chapproto = 0;
m = (Lcpmsg*)b->rptr;
repb = alloclcp(Lconfack, m->id, BLEN(b), &repm);
/* copy options into ack packet */
memmove(repm->data, m->data, b->wptr - m->data);
repb->wptr += b->wptr - m->data;
/* look for options we don't recognize or like */
for(cp = m->data; cp < b->wptr; cp += o->len){
o = (Lcpopt*)cp;
if(cp + o->len > b->wptr || o->len < 2){
freeb(repb);
netlog("ppp: bad option length %ux\n", o->type);
return -1;
}
switch(p->proto){
case Plcp:
switch(o->type){
case Oac:
flags |= Fac;
continue;
case Opc:
flags |= Fpc;
continue;
case Omtu:
mtu = nhgets(o->data);
continue;
case Omagic:
if(ppp->magic == nhgetl(o->data))
netlog("ppp: possible loop\n");
continue;
case Octlmap:
ctlmap = nhgetl(o->data);
continue;
case Oquality:
proto = nhgets(o->data);
if(proto != Plqm)
break;
x = nhgetl(o->data+2)*10;
period = (x+Period-1)/Period;
continue;
case Oauth:
proto = nhgets(o->data);
if(proto == Ppasswd && !server){
chapproto = APpasswd;
continue;
}
if(proto != Pchap)
break;
if(o->data[2] != APmd5
&& o->data[2] != APmschap
&& o->data[2] != APmschapv2)
break;
chapproto = o->data[2];
continue;
}
break;
case Pccp:
switch(o->type){
case Octhwack:
break;
/*
if(o->len == 2){
ctype = &cthwack;
continue;
}
if(!nacking){
nacking = 1;
repb->wptr = repm->data;
repm->code = Lconfnak;
}
puto(repb, Octhwack);
continue;
*/
case Ocmppc:
x = nhgetl(o->data);
/* stop ppp loops */
if((x&0x41) == 0 || ppp->ctries++ > 5) {
/*
* turn off requests as well - I don't think this
* is needed in the standard
*/
p->optmask &= ~Fcmppc;
break;
}
if(rejecting)
continue;
if((x & 0x01000001) == 1){
ctype = &cmppc;
ppp->sendencrypted = (o->data[3]&0x40) == 0x40;
continue;
}
if(!nacking){
nacking = 1;
repb->wptr = repm->data;
repm->code = Lconfnak;
}
*repb->wptr++ = Ocmppc;
*repb->wptr++ = 6;
*repb->wptr++ = 0;
*repb->wptr++ = 0;
*repb->wptr++ = 0;
*repb->wptr++ = 0x41;
continue;
}
break;
case Pipcp:
switch(o->type){
case Oipaddr:
v4tov6(ipaddr, o->data);
if(!validv4(ppp->remote))
continue;
if(!validv4(ipaddr) && !rejecting){
/* other side requesting an address */
if(!nacking){
nacking = 1;
repb->wptr = repm->data;
repm->code = Lconfnak;
}
putv4o(repb, Oipaddr, ppp->remote);
}
continue;
case Oipdns:
ap = ppp->dns[0];
goto ipinfo;
case Oipdns2:
ap = ppp->dns[1];
goto ipinfo;
case Oipwins:
ap = ppp->wins[0];
goto ipinfo;
case Oipwins2:
ap = ppp->wins[1];
goto ipinfo;
ipinfo:
if(!validv4(ap))
getipinfo(ppp);
if(!validv4(ap))
break;
v4tov6(ipaddr, o->data);
if(!validv4(ipaddr) && !rejecting){
/* other side requesting an address */
if(!nacking){
nacking = 1;
repb->wptr = repm->data;
repm->code = Lconfnak;
}
putv4o(repb, o->type, ap);
}
continue;
case Oipcompress:
/*
* don't compress tcp header if we've negotiated data compression.
* tcp header compression has very poor performance if there is an error.
*/
proto = nhgets(o->data);
if(noipcompress || proto != Pvjctcp || ppp->ctype != nil)
break;
if(compress_negotiate(ppp->ctcp, o->data+2) < 0)
break;
flags |= Fipcompress;
continue;
}
break;
case Pipv6cp:
switch(o->type){
case Oipv6eui:
euitov6(ipaddr6, o->data, o->len-2);
if(!validv6(ppp->remote6))
continue;
if(!validv6(ipaddr6) && !rejecting){
/* other side requesting an address */
if(!nacking){
nacking = 1;
repb->wptr = repm->data;
repm->code = Lconfnak;
}
putoeui64(repb, Oipv6eui, &ppp->remote6[8]);
}
continue;
}
break;
}
/* come here if option is not recognized */
if(!rejecting){
rejecting = 1;
repb->wptr = repm->data;
repm->code = Lconfrej;
}
netlog("ppp: bad %ux option %d\n", p->proto, o->type);
memmove(repb->wptr, o, o->len);
repb->wptr += o->len;
}
/* permanent changes only after we know that we liked the packet */
if(!rejecting && !nacking){
switch(p->proto){
case Plcp:
ppp->period = period;
ppp->xctlmap = ctlmap;
if(mtu > Maxmtu)
mtu = Maxmtu;
if(mtu < Minmtu)
mtu = Minmtu;
ppp->mtu = mtu;
if(chapproto)
ppp->chap->proto = chapproto;
break;
case Pccp:
if(ppp->ctype != nil){
(*ppp->ctype->fini)(ppp->cstate);
ppp->cstate = nil;
}
ppp->ctype = ctype;
if(ctype)
ppp->cstate = (*ctype->init)(ppp);
break;
case Pipcp:
if(validv4(ipaddr) && ppp->remotefrozen == 0)
ipmove(ppp->remote, ipaddr);
break;
case Pipv6cp:
if(validv6(ipaddr6) && ppp->remote6frozen == 0)
ipmove(ppp->remote6, ipaddr6);
break;
}
p->flags = flags;
}
hnputs(repm->len, BLEN(repb));
printopts(p, repb, 1);
putframe(ppp, p->proto, repb);
freeb(repb);
return rejecting || nacking;
}
static void
dmppkt(char *s, uchar *a, int na)
{
int i;
if (debug < 3)
return;
fprint(2, "%s", s);
for(i = 0; i < na; i++)
fprint(2, " %.2ux", a[i]);
fprint(2, "\n");
}
static void
dropoption(Pstate *p, Lcpopt *o)
{
switch(p->proto){
case Pipcp:
switch(o->type){
case Oipaddr:
/* never drop it */
return;
case Oipdns:
p->optmask &= ~Fipdns;
return;
case Oipwins:
p->optmask &= ~Fipwins;
return;
case Oipdns2:
p->optmask &= ~Fipdns2;
return;
case Oipwins2:
p->optmask &= ~Fipwins2;
return;
}
break;
case Pipv6cp:
switch(o->type){
case Oipv6eui:
/* never drop it */
return;
}
break;
}
if(o->type < 8*sizeof(p->optmask))
p->optmask &= ~(1<<o->type);
}
/*
* parse configuration rejection, just stop sending anything that they
* don't like (except for ipcp address nak).
*/
static void
rejopts(PPP *ppp, Pstate *p, Block *b, int code)
{
Lcpmsg *m;
Lcpopt *o;
Ipaddr newip;
/* just give up trying what the other side doesn't like */
m = (Lcpmsg*)b->rptr;
for(b->rptr = m->data; b->rptr < b->wptr; b->rptr += o->len){
o = (Lcpopt*)b->rptr;
if(b->rptr + o->len > b->wptr || o->len < 2){
netlog("ppp: bad roption length %ux\n", o->type);
return;
}
if(code == Lconfrej){
dropoption(p, o);
netlog("ppp: %ux rejecting %d\n",
p->proto, o->type);
continue;
}
switch(p->proto){
case Plcp:
switch(o->type){
case Octlmap:
ppp->rctlmap = nhgetl(o->data);
break;
case Oauth:
/* don't allow client to request no auth */
/* could try different auth protocol here */
terminate(ppp, "chap rejected", 0);
return;
default:
dropoption(p, o);
break;
};
break;
case Pccp:
switch(o->type){
default:
dropoption(p, o);
break;
}
break;
case Pipcp:
switch(o->type){
case Oipaddr:
v4tov6(newip, o->data);
syslog(0, LOG, "rejected IPv4 addr %I with %I", ppp->local, newip);
/* if we're a server, don't let other end change our addr */
if(ppp->localfrozen){
dropoption(p, o);
break;
}
/* accept whatever server tells us */
if(!validv4(ppp->local)){
ipmove(ppp->local, newip);
dropoption(p, o);
break;
}
/* if he didn't like our addr, ask for a generic one */
if(!validv4(newip)){
invalidate(ppp->local);
break;
}
/* if he gives us something different, use it anyways */
ipmove(ppp->local, newip);
dropoption(p, o);
break;
case Oipdns:
if (!validv4(ppp->dns[0])){
v4tov6(ppp->dns[0], o->data);
dropoption(p, o);
break;
}
v4tov6(newip, o->data);
if(!validv4(newip)){
invalidate(ppp->dns[0]);
break;
}
v4tov6(ppp->dns[0], o->data);
dropoption(p, o);
break;
case Oipwins:
if (!validv4(ppp->wins[0])){
v4tov6(ppp->wins[0], o->data);
dropoption(p, o);
break;
}
v4tov6(newip, o->data);
if(!validv4(newip)){
invalidate(ppp->wins[0]);
break;
}
v4tov6(ppp->wins[0], o->data);
dropoption(p, o);
break;
case Oipdns2:
if (!validv4(ppp->dns[1])){
v4tov6(ppp->dns[1], o->data);
dropoption(p, o);
break;
}
v4tov6(newip, o->data);
if(!validv4(newip)){
invalidate(ppp->dns[1]);
break;
}
v4tov6(ppp->dns[1], o->data);
dropoption(p, o);
break;
case Oipwins2:
if (!validv4(ppp->wins[1])){
v4tov6(ppp->wins[1], o->data);
dropoption(p, o);
break;
}
v4tov6(newip, o->data);
if(!validv4(newip)){
invalidate(ppp->wins[1]);
break;
}
v4tov6(ppp->wins[1], o->data);
dropoption(p, o);
break;
default:
dropoption(p, o);
break;
}
break;
case Pipv6cp:
switch(o->type){
case Oipv6eui:
euitov6(newip, o->data, o->len-2);
syslog(0, LOG, "rejected IPv6 addr %I with %I", ppp->local6, newip);
/* if we're a server, don't let other end change our addr */
if(ppp->local6frozen){
dropoption(p, o);
break;
}
/* accept whatever server tells us */
if(!validv6(ppp->local6)){
ipmove(ppp->local6, newip);
dropoption(p, o);
break;
}
/* if he didn't like our addr, ask for a generic one */
if(!validv6(newip)){
invalidate(ppp->local6);
break;
}
/* if he gives us something different, use it anyways */
ipmove(ppp->local6, newip);
dropoption(p, o);
break;
default:
dropoption(p, o);
break;
}
}
}
}
/*
* put a messages through the lcp or ipcp state machine. They are
* very similar.
*/
static void
rcv(PPP *ppp, Pstate *p, Block *b)
{
ulong len;
int err;
Lcpmsg *m;
int proto;
if(BLEN(b) < 4){
netlog("ppp: short lcp message\n");
freeb(b);
return;
}
m = (Lcpmsg*)b->rptr;
len = nhgets(m->len);
if(BLEN(b) < len){
netlog("ppp: short lcp message\n");
freeb(b);
return;
}
netlog("ppp: %ux rcv %d len %ld id %d/%d/%d\n",
p->proto, m->code, len, m->id, p->confid, p->id);
if(p->proto != Plcp && ppp->lcp->state != Sopened){
netlog("ppp: non-lcp with lcp not open\n");
freeb(b);
return;
}
qlock(ppp);
switch(m->code){
case Lconfreq:
printopts(p, b, 0);
err = getopts(ppp, p, b);
if(err < 0)
break;
if(m->id == p->rcvdconfid)
break; /* don't change state for duplicates */
switch(p->state){
case Sackrcvd:
if(err)
break;
newstate(ppp, p, Sopened);
break;
case Sclosed:
case Sopened:
config(ppp, p, 1);
if(err == 0)
newstate(ppp, p, Sacksent);
else
newstate(ppp, p, Sreqsent);
break;
case Sreqsent:
case Sacksent:
if(err == 0)
newstate(ppp, p, Sacksent);
else
newstate(ppp, p, Sreqsent);
break;
}
break;
case Lconfack:
if(p->confid != m->id){
/* ignore if it isn't the message we're sending */
netlog("ppp: dropping confack\n");
break;
}
p->confid = -1; /* ignore duplicates */
p->id++; /* avoid sending duplicates */
netlog("ppp: recv confack\n");
switch(p->state){
case Sopened:
case Sackrcvd:
config(ppp, p, 1);
newstate(ppp, p, Sreqsent);
break;
case Sreqsent:
newstate(ppp, p, Sackrcvd);
break;
case Sacksent:
newstate(ppp, p, Sopened);
break;
}
break;
case Lconfrej:
case Lconfnak:
if(p->confid != m->id) {
/* ignore if it isn't the message we're sending */
netlog("ppp: dropping confrej or confnak\n");
break;
}
p->confid = -1; /* ignore duplicates */
p->id++; /* avoid sending duplicates */
switch(p->state){
case Sopened:
case Sackrcvd:
config(ppp, p, 1);
newstate(ppp, p, Sreqsent);
break;
case Sreqsent:
case Sacksent:
printopts(p, b, 0);
rejopts(ppp, p, b, m->code);
if(dying)
break;
config(ppp, p, 1);
break;
}
break;
case Ltermreq:
m->code = Ltermack;
putframe(ppp, p->proto, b);
switch(p->state){
case Sackrcvd:
case Sacksent:
newstate(ppp, p, Sreqsent);
break;
case Sopened:
newstate(ppp, p, Sclosing);
break;
}
break;
case Ltermack:
if(p->termid != m->id) /* ignore if it isn't the message we're sending */
break;
if(p->proto == Plcp)
ppp->ipcp->state = Sclosed;
switch(p->state){
case Sclosing:
newstate(ppp, p, Sclosed);
break;
case Sackrcvd:
newstate(ppp, p, Sreqsent);
break;
case Sopened:
config(ppp, p, 0);
newstate(ppp, p, Sreqsent);
break;
}
break;
case Lcoderej:
//newstate(ppp, p, Sclosed);
syslog(0, LOG, "code reject %d", m->data[0]);
break;
case Lprotorej:
proto = nhgets(m->data);
netlog("ppp: proto reject %ux\n", proto);
if(proto == Pccp)
newstate(ppp, ppp->ccp, Sclosed);
break;
case Lechoreq:
if(BLEN(b) < 8){
netlog("ppp: short lcp echo request\n");
freeb(b);
return;
}
m->code = Lechoack;
hnputl(m->data, ppp->magic);
putframe(ppp, p->proto, b);
break;
case Lechoack:
p->echoack = 1;
break;
case Ldiscard:
/* nothing to do */
break;
case Lresetreq:
if(p->proto != Pccp)
break;
ppp->stat.compreset++;
if(ppp->ctype != nil)
b = (*ppp->ctype->resetreq)(ppp->cstate, b);
if(b != nil) {
m = (Lcpmsg*)b->rptr;
m->code = Lresetack;
putframe(ppp, p->proto, b);
}
break;
case Lresetack:
if(p->proto != Pccp)
break;
if(ppp->unctype != nil)
(*ppp->unctype->resetack)(ppp->uncstate, b);
break;
}
qunlock(ppp);
freeb(b);
}
/*
* timer for protocol state machine
*/
static void
ptimer(PPP *ppp, Pstate *p)
{
if(p->state == Sopened || p->state == Sclosed)
return;
p->timeout--;
switch(p->state){
case Sclosing:
sendtermreq(ppp, p);
break;
case Sreqsent:
case Sacksent:
if(p->timeout <= 0)
newstate(ppp, p, Sclosed);
else {
config(ppp, p, 0);
}
break;
case Sackrcvd:
if(p->timeout <= 0)
newstate(ppp, p, Sclosed);
else {
config(ppp, p, 0);
newstate(ppp, p, Sreqsent);
}
break;
}
}
/* paptimer -- pap timer event handler
*
* If PAP authorization hasn't come through, resend an authreqst. If
* the maximum number of requests have been sent (~ 30 seconds), give
* up.
*
*/
static void
authtimer(PPP* ppp)
{
if(ppp->chap->proto != APpasswd)
return;
if(ppp->chap->id < 21)
putpaprequest(ppp);
else {
netlog("ppp: pap timed out--not authorized\n");
terminate(ppp, "pap timeout", 0);
}
}
static void
pingtimer(PPP* ppp)
{
if(ppp->lcp->echotimeout == 0 || ppp->lcp->echoack)
ppp->lcp->echotimeout = (3*4*1000+Period-1)/Period;
else if(--(ppp->lcp->echotimeout) <= 0){
netlog("ppp: echo request timeout\n");
terminate(ppp, "echo timeout", 0);
return;
}
ppp->lcp->echoack = 0;
sendechoreq(ppp, ppp->lcp);
}
/*
* timer for ppp
*/
static void
ppptimer(PPP *ppp)
{
while(!dying){
sleep(Period);
qlock(ppp);
netlog("ppp: ppptimer\n");
ptimer(ppp, ppp->lcp);
if(ppp->lcp->state == Sopened) {
switch(ppp->phase){
case Pnet:
ptimer(ppp, ppp->ccp);
ptimer(ppp, ppp->ipcp);
ptimer(ppp, ppp->ipv6cp);
pingtimer(ppp);
break;
case Pauth:
authtimer(ppp);
break;
}
}
/* link quality measurement */
if(ppp->period && --(ppp->timeout) <= 0){
ppp->timeout = ppp->period;
putlqm(ppp);
}
qunlock(ppp);
}
}
static void
ipconfig(int shell, char *net, char *dev, int mtu, int proxy, Ipaddr gate, Ipaddr dns[2], char *duid)
{
fprint(shell, "ip/ipconfig -x %q ", net);
if(!primary){
/* don't write /net/ndb */
fprint(shell, "-P ");
} else {
/* write dns servers in /net/ndb */
if(dns != nil){
int i;
for(i = 0; i < 2; i++){
if(validv4(dns[i]))
fprint(shell, "-s %I ", dns[i]);
}
}
/* set default gateway */
if(gate != nil)
fprint(shell, "-g %I ", gate);
}
/* allow dhcpv6 */
if(duid != nil)
fprint(shell, "-dU %q ", duid);
if(mtu > 0)
fprint(shell, "-m %d ", mtu);
if(proxy)
fprint(shell, "-y ");
fprint(shell, "pkt %q ", dev);
}
static void
addip(int shell, char *net, char *dev, Ipaddr local, Ipaddr remote, int mtu, Ipaddr *dns)
{
if(validv4(local) && validv4(remote)){
ipconfig(shell, net, dev, mtu, proxy, remote, dns, nil);
fprint(shell, "add %I 255.255.255.255 %I\n", local, remote);
} else if(validv6(local)){
ipconfig(shell, net, dev, mtu, 0, nil, nil, nil);
fprint(shell, "add %I /64\n", local);
}
}
static void
removeip(int shell, char *net, char *dev, Ipaddr local, Ipaddr remote)
{
if(validv4(local) && validv4(remote)){
ipconfig(shell, net, dev, 0, 0, remote, nil, nil);
fprint(shell, "remove %I 255.255.255.255\n", local);
} else if(validv6(local)){
ipconfig(shell, net, dev, 0, 0, nil, nil, nil);
fprint(shell, "remove %I /64\n", local);
}
}
static void
v6autoconfig(int shell, char *net, char *dev, Ipaddr remote, char *duid)
{
if(server || !validv6(remote))
return;
ipconfig(shell, net, dev, 0, proxy, remote, nil, duid);
fprint(shell, "ra6 recvra 1\n");
}
static char*
ipopen(PPP *ppp)
{
static int ipinprocpid;
int n, cfd, fd;
char path[128];
char buf[128];
if(ipinprocpid <= 0){
snprint(path, sizeof path, "%s/ipifc/clone", ppp->net);
cfd = open(path, ORDWR);
if(cfd < 0)
return "can't open ip interface";
n = read(cfd, buf, sizeof(buf) - 1);
if(n <= 0){
close(cfd);
return "can't open ip interface";
}
buf[n] = 0;
snprint(path, sizeof path, "%s/ipifc/%s/data", ppp->net, buf);
fd = open(path, ORDWR);
if(fd < 0){
close(cfd);
return "can't open ip interface";
}
if(ppp->dev == nil)
ppp->dev = smprint("%s/ipifc/%s", ppp->net, buf);
if(fprint(cfd, "bind pkt %s", ppp->dev) < 0){
close(fd);
close(cfd);
return "binding pkt to ip interface";
}
if(baud)
fprint(cfd, "speed %d", baud);
close(cfd);
ppp->ipfd = fd;
switch(ipinprocpid = rfork(RFPROC|RFMEM|RFNOWAIT)){
case -1:
terminate(ppp, "forking ipinproc", 1);
case 0:
ipinproc(ppp);
terminate(ppp, "ipinproc", 0);
exits(nil);
}
if(validv4(ppp->local)){
if(!validv4(ppp->remote))
ipmove(ppp->remote, ppp->local);
syslog(0, LOG, "%I/%I", ppp->local, ppp->remote);
addip(ppp->shellin, ppp->net, ppp->dev, ppp->local, ppp->remote, ppp->mtu, ppp->dns);
}
if(validv6(ppp->local6) && validv6(ppp->remote6)){
syslog(0, LOG, "%I/%I", ppp->local6, ppp->remote6);
addip(ppp->shellin, ppp->net, ppp->dev, ppp->local6, ppp->remote6, ppp->mtu, nil);
v6autoconfig(ppp->shellin, ppp->net, ppp->dev, ppp->remote6, ppp->duid);
}
/* fork in background, main returns */
fprint(ppp->shellin, "rc </fd/0 &; exit ''\n");
} else {
/* we may have changed addresses */
if(ipcmp(ppp->local, ppp->curlocal) != 0 || ipcmp(ppp->remote, ppp->curremote) != 0){
if(!validv4(ppp->remote))
ipmove(ppp->remote, ppp->local);
syslog(0, LOG, "%I/%I -> %I/%I", ppp->curlocal, ppp->curremote,
ppp->local, ppp->remote);
removeip(ppp->shellin, ppp->net, ppp->dev, ppp->curlocal, ppp->curremote);
addip(ppp->shellin, ppp->net, ppp->dev, ppp->local, ppp->remote, ppp->mtu, ppp->dns);
}
if(ipcmp(ppp->local6, ppp->curlocal6) != 0 || ipcmp(ppp->remote6, ppp->curremote6) != 0){
syslog(0, LOG, "%I/%I -> %I/%I", ppp->curlocal6, ppp->curremote6,
ppp->local6, ppp->remote6);
removeip(ppp->shellin, ppp->net, ppp->dev, ppp->curlocal6, ppp->curremote6);
addip(ppp->shellin, ppp->net, ppp->dev, ppp->local6, ppp->remote6, ppp->mtu, nil);
v6autoconfig(ppp->shellin, ppp->net, ppp->dev, ppp->remote6, ppp->duid);
}
}
ipmove(ppp->curlocal, ppp->local);
ipmove(ppp->curremote, ppp->remote);
ipmove(ppp->curlocal6, ppp->local6);
ipmove(ppp->curremote6, ppp->remote6);
return nil;
}
/* return next input IP packet */
Block*
pppread(PPP *ppp)
{
Block *b, *reply;
int proto, len;
Lcpmsg *m;
while(!dying){
b = getframe(ppp, &proto);
if(b == nil)
return nil;
netlog("ppp: getframe 0x%ux %zd\n", proto, BLEN(b));
Again:
switch(proto){
case Pip:
if(ppp->ipcp->state == Sopened)
return b;
netlog("ppp: IP recved: link not up\n");
freeb(b);
continue;
case Pipv6:
if(ppp->ipv6cp->state == Sopened)
return b;
netlog("ppp: IPv6 recved: link not up\n");
freeb(b);
continue;
case Pvjctcp:
case Pvjutcp:
if(ppp->ipcp->state != Sopened){
netlog("ppp: VJ tcp recved: link not up\n");
freeb(b);
continue;
}
ppp->stat.vjin++;
b = tcpuncompress(ppp->ctcp, b, proto);
if(b != nil)
return b;
ppp->stat.vjfail++;
continue;
case Pcdata:
ppp->stat.uncomp++;
if(ppp->ccp->state != Sopened){
netlog("ppp: compressed data recved: link not up\n");
freeb(b);
continue;
}
if(ppp->unctype == nil) {
netlog("ppp: compressed data recved: no compression\n");
freeb(b);
continue;
}
len = BLEN(b);
reply = nil;
b = (*ppp->unctype->uncompress)(ppp, b, &proto, &reply);
if(reply != nil){
/* send resetreq */
ppp->stat.uncompreset++;
putframe(ppp, Pccp, reply);
freeb(reply);
}
if(b == nil)
continue;
ppp->stat.uncompin += len;
ppp->stat.uncompout += BLEN(b);
netlog("ppp: uncompressed frame %ux %d %d (%zd uchars)\n",
proto, b->rptr[0], b->rptr[1], BLEN(b));
goto Again;
}
switch(proto){
case Plcp:
rcv(ppp, ppp->lcp, b);
break;
case Pccp:
rcv(ppp, ppp->ccp, b);
break;
case Pipcp:
rcv(ppp, ppp->ipcp, b);
break;
case Pipv6cp:
rcv(ppp, ppp->ipv6cp, b);
break;
case Plqm:
getlqm(ppp, b);
break;
case Pchap:
getchap(ppp, b);
break;
case Ppasswd:
getpap(ppp, b);
break;
default:
syslog(0, LOG, "unknown proto %ux", proto);
if(ppp->lcp->state == Sopened){
/* reject the protocol */
b->rptr -= 6;
m = (Lcpmsg*)b->rptr;
m->code = Lprotorej;
m->id = ++ppp->lcp->id;
hnputs(m->data, proto);
hnputs(m->len, BLEN(b));
putframe(ppp, Plcp, b);
}
freeb(b);
break;
}
}
return nil;
}
typedef struct Iphdr Iphdr;
struct Iphdr
{
uchar vihl; /* Version and header length */
uchar tos; /* Type of service */
uchar length[2]; /* packet length */
uchar id[2]; /* Identification */
uchar frag[2]; /* Fragment information */
uchar ttl; /* Time to live */
uchar proto; /* Protocol */
uchar cksum[2]; /* Header checksum */
uchar src[4]; /* Ip source (uchar ordering unimportant) */
uchar dst[4]; /* Ip destination (uchar ordering unimportant) */
};
/* transmit an IP packet */
int
pppwrite(PPP *ppp, Block *b)
{
int proto;
int len, tot;
Iphdr *ip;
Ip6hdr *ip6;
len = BLEN(b);
ip = (Iphdr*)b->rptr;
switch(ip->vihl & 0xF0){
default:
Badhdr:
freeb(b);
return len;
case IP_VER4:
if(len < IPV4HDR_LEN || (tot = nhgets(ip->length)) < IPV4HDR_LEN)
goto Badhdr;
if(b->wptr < (uchar*)ip + tot)
goto Badhdr;
b->wptr = (uchar*)ip + tot;
qlock(ppp);
if(ppp->ipcp->state != Sopened)
goto Drop;
proto = Pip;
if(ppp->ipcp->flags & Fipcompress){
b = compress(ppp->ctcp, b, &proto);
if(b == nil)
goto Drop;
if(proto != Pip)
ppp->stat.vjout++;
}
break;
case IP_VER6:
if(len < IPV6HDR_LEN)
goto Badhdr;
ip6 = (Ip6hdr*)ip;
tot = IPV6HDR_LEN + nhgets(ip6->ploadlen);
if(b->wptr < (uchar*)ip6 + tot)
goto Badhdr;
b->wptr = (uchar*)ip6 + tot;
qlock(ppp);
if(ppp->ipv6cp->state != Sopened)
goto Drop;
proto = Pipv6;
break;
}
ppp->stat.ipsend++;
if(ppp->ctype != nil) {
b = (*ppp->ctype->compress)(ppp, proto, b, &proto);
if(proto == Pcdata) {
ppp->stat.comp++;
ppp->stat.compin += len;
ppp->stat.compout += BLEN(b);
}
}
if(putframe(ppp, proto, b) < 0)
len = -1;
Drop:
qunlock(ppp);
freeb(b);
return len;
}
static void
terminate(PPP *ppp, char *why, int fatal)
{
if(dying++)
return;
syslog(0, LOG, "ppp: terminated: %s", why);
if(ppp->dev != nil){
removeip(ppp->shellin, ppp->net, ppp->dev, ppp->curlocal, ppp->curremote);
removeip(ppp->shellin, ppp->net, ppp->dev, ppp->curlocal6, ppp->curremote6);
}
fprint(ppp->shellin, "exit %q\n", why);
close(ppp->shellin);
ppp->shellin = -1;
close(ppp->ipfd);
ppp->ipfd = -1;
close(ppp->mediain);
close(ppp->mediaout);
ppp->mediain = -1;
ppp->mediaout = -1;
postnote(PNGROUP, getpid(), "die");
if(fatal)
sysfatal("%s", why);
}
static void
ipinproc(PPP *ppp)
{
Block b[1] = *allocb(Buflen);
int n;
while(!dying){
n = read(ppp->ipfd, b->wptr, BALLOC(b));
if(n <= 0)
break;
b->wptr += n;
if(pppwrite(ppp, b) < 0)
break;
resetb(b);
}
}
static void
catchdie(void*, char *msg)
{
if(strstr(msg, "die") != nil)
noted(NCONT);
else
noted(NDFLT);
}
static void
hexdump(uchar *a, int na)
{
int i;
char buf[80];
fprint(2, "dump %p %d\n", a, na);
buf[0] = '\0';
for(i=0; i<na; i++){
sprint(buf+strlen(buf), " %.2ux", a[i]);
if(i%16 == 7)
sprint(buf+strlen(buf), " --");
if(i%16==15){
sprint(buf+strlen(buf), "\n");
write(2, buf, strlen(buf));
buf[0] = '\0';
}
}
if(i%16){
sprint(buf+strlen(buf), "\n");
write(2, buf, strlen(buf));
}
}
static void
mediainproc(PPP *ppp)
{
Block *b;
notify(catchdie);
while(!dying){
b = pppread(ppp);
if(b == nil){
syslog(0, LOG, "pppread return nil");
break;
}
ppp->stat.iprecv++;
if(debug > 1){
netlog("ip write pkt %p %zd\n", b->rptr, BLEN(b));
hexdump(b->rptr, BLEN(b));
}
if(write(ppp->ipfd, b->rptr, BLEN(b)) < 0) {
syslog(0, LOG, "error writing to pktifc");
break;
}
freeb(b);
}
netlog(": remote=%I/%I: ppp shutting down\n", ppp->remote, ppp->remote6);
syslog(0, LOG, ": remote=%I/%I: ppp shutting down", ppp->remote, ppp->remote6);
syslog(0, LOG, "\t\tppp send = %lud/%lud recv= %lud/%lud",
ppp->out.packets, ppp->out.uchars,
ppp->in.packets, ppp->in.uchars);
syslog(0, LOG, "\t\tip send=%lud", ppp->stat.ipsend);
syslog(0, LOG, "\t\tip recv=%lud notup=%lud badsrc=%lud",
ppp->stat.iprecv, ppp->stat.iprecvnotup, ppp->stat.iprecvbadsrc);
syslog(0, LOG, "\t\tcompress=%lud in=%lud out=%lud reset=%lud",
ppp->stat.comp, ppp->stat.compin, ppp->stat.compout, ppp->stat.compreset);
syslog(0, LOG, "\t\tuncompress=%lud in=%lud out=%lud reset=%lud",
ppp->stat.uncomp, ppp->stat.uncompin, ppp->stat.uncompout,
ppp->stat.uncompreset);
syslog(0, LOG, "\t\tvjin=%lud vjout=%lud vjfail=%lud",
ppp->stat.vjin, ppp->stat.vjout, ppp->stat.vjfail);
}
/*
* link quality management
*/
static void
getlqm(PPP *ppp, Block *b)
{
Qualpkt *p;
p = (Qualpkt*)b->rptr;
if(BLEN(b) == sizeof(Qualpkt)){
ppp->in.reports++;
ppp->pout.reports = nhgetl(p->peeroutreports);
ppp->pout.packets = nhgetl(p->peeroutpackets);
ppp->pout.uchars = nhgetl(p->peeroutuchars);
ppp->pin.reports = nhgetl(p->peerinreports);
ppp->pin.packets = nhgetl(p->peerinpackets);
ppp->pin.discards = nhgetl(p->peerindiscards);
ppp->pin.errors = nhgetl(p->peerinerrors);
ppp->pin.uchars = nhgetl(p->peerinuchars);
/* save our numbers at time of reception */
memmove(&ppp->sin, &ppp->in, sizeof(Qualstats));
}
freeb(b);
if(ppp->period == 0)
putlqm(ppp);
}
static void
putlqm(PPP *ppp)
{
Qualpkt *p;
Block *b;
b = allocb(sizeof(Qualpkt));
b->wptr += sizeof(Qualpkt);
p = (Qualpkt*)b->rptr;
hnputl(p->magic, 0);
/* heresay (what he last told us) */
hnputl(p->lastoutreports, ppp->pout.reports);
hnputl(p->lastoutpackets, ppp->pout.packets);
hnputl(p->lastoutuchars, ppp->pout.uchars);
/* our numbers at time of last reception */
hnputl(p->peerinreports, ppp->sin.reports);
hnputl(p->peerinpackets, ppp->sin.packets);
hnputl(p->peerindiscards, ppp->sin.discards);
hnputl(p->peerinerrors, ppp->sin.errors);
hnputl(p->peerinuchars, ppp->sin.uchars);
/* our numbers now */
hnputl(p->peeroutreports, ppp->out.reports+1);
hnputl(p->peeroutpackets, ppp->out.packets+1);
hnputl(p->peeroutuchars, ppp->out.uchars+53/*hack*/);
putframe(ppp, Plqm, b);
freeb(b);
ppp->out.reports++;
}
static char*
getaproto(int proto)
{
switch(proto){
case APmd5:
return "chap";
case APmschap:
return "mschap";
case APmschapv2:
return "mschapv2";
}
return nil;
}
/*
* init challenge response dialog
*/
static void
chapinit(PPP *ppp)
{
Block *b;
Lcpmsg *m;
Chap *c;
int len;
c = ppp->chap;
c->id++;
if(c->ai != nil){
auth_freeAI(c->ai);
c->ai = nil;
}
if((c->cs = auth_challenge("proto=%q role=server", getaproto(c->proto))) == nil){
char err[ERRMAX];
snprint(err, sizeof(err), "auth_challenge: %r");
terminate(ppp, err, 1);
}
syslog(0, LOG, ": remote=%I: sending %d byte challenge", ppp->remote, c->cs->nchal);
len = 4 + 1 + c->cs->nchal + strlen(ppp->chapname);
b = alloclcp(Cchallenge, c->id, len, &m);
*b->wptr++ = c->cs->nchal;
memmove(b->wptr, c->cs->chal, c->cs->nchal);
b->wptr += c->cs->nchal;
memmove(b->wptr, ppp->chapname, strlen(ppp->chapname));
b->wptr += strlen(ppp->chapname);
hnputs(m->len, len);
putframe(ppp, Pchap, b);
freeb(b);
c->state = Cchalsent;
}
/*
* challenge response dialog
*/
static void
setppekey(PPP *ppp, int isserver)
{
Chap *c = ppp->chap;
switch(c->proto){
case APmschap:
if(c->ai == nil || c->ai->nsecret != 16)
terminate(ppp, "could not get the encryption key", 1);
memmove(ppp->sendkey, c->ai->secret, 16);
memmove(ppp->recvkey, c->ai->secret, 16);
break;
case APmschapv2:
if(c->ai == nil || c->ai->nsecret != 16+20)
terminate(ppp, "could not get the encryption key + authenticator", 1);
getasymkey(ppp->sendkey, c->ai->secret, 1, isserver);
getasymkey(ppp->recvkey, c->ai->secret, 0, isserver);
break;
}
auth_freeAI(c->ai);
c->ai = nil;
}
static void
getchap(PPP *ppp, Block *b)
{
Lcpmsg *m;
int len, vlen, i, id, n, nresp;
char code;
Chap *c;
Chapreply cr;
MSchapreply mscr;
char uid[PATH];
uchar resp[256], *p;
m = (Lcpmsg*)b->rptr;
len = nhgets(m->len);
if(BLEN(b) < len){
syslog(0, LOG, "short chap message");
freeb(b);
return;
}
qlock(ppp);
c = ppp->chap;
vlen = m->data[0];
switch(m->code){
case Cchallenge:
id = m->id;
memset(ppp->chapname, 0, sizeof(ppp->chapname));
nresp = auth_respondAI(m->data+1, vlen,
ppp->chapname, sizeof(ppp->chapname),
resp, sizeof(resp), &c->ai,
auth_getkey,
"proto=%s role=client service=ppp %s",
getaproto(c->proto), keyspec);
if(nresp < 0){
char err[ERRMAX];
snprint(err, sizeof(err), "auth_respond: %r");
terminate(ppp, err, 1);
}
if(c->proto == APmschap || c->proto == APmschapv2)
while(nresp < 49) resp[nresp++] = 0;
freeb(b);
len = 4 + 1 + nresp + strlen(ppp->chapname);
b = alloclcp(Cresponse, id, len, &m);
*b->wptr++ = nresp;
memmove(b->wptr, resp, nresp);
b->wptr += nresp;
memmove(b->wptr, ppp->chapname, strlen(ppp->chapname));
b->wptr += strlen(ppp->chapname);
hnputs(m->len, len);
netlog("ppp: sending response len %d\n", len);
putframe(ppp, Pchap, b);
break;
case Cresponse:
if(m->id != c->id || c->cs == nil) {
netlog("ppp: chap: bad response id\n");
break;
}
switch(c->proto) {
default:
terminate(ppp, "unknown chap protocol", 0);
sysfatal("unknown chap protocol: %d", c->proto);
case APmd5:
if(vlen > len - 5 || vlen != 16) {
netlog("ppp: chap: bad response len\n");
break;
}
cr.id = m->id;
memmove(cr.resp, m->data+1, 16);
memset(uid, 0, sizeof(uid));
n = len-5-vlen;
if(n >= PATH)
n = PATH-1;
memmove(uid, m->data+1+vlen, n);
c->cs->user = uid;
c->cs->resp = &cr;
c->cs->nresp = sizeof cr;
break;
case APmschap:
case APmschapv2:
if(vlen > len - 5 || vlen < 48) {
netlog("ppp: chap: bad response len\n");
break;
}
memset(&mscr, 0, sizeof(mscr));
memmove(mscr.LMresp, m->data+1, 24);
memmove(mscr.NTresp, m->data+24+1, 24);
n = len-5-vlen;
p = m->data+1+vlen;
/* remove domain name */
for(i=0; i<n; i++) {
if(p[i] == '\\') {
p += i+1;
n -= i+1;
break;
}
}
if(n >= PATH)
n = PATH-1;
memset(uid, 0, sizeof(uid));
memmove(uid, p, n);
c->cs->user = uid;
c->cs->resp = 𝓂
c->cs->nresp = sizeof mscr;
break;
}
syslog(0, LOG, ": remote=%I vlen %d proto %d response user %s nresp %d",
ppp->remote, vlen, c->proto, c->cs->user, c->cs->nresp);
if((c->ai = auth_response(c->cs)) == nil || auth_chuid(c->ai, nil) < 0){
c->state = Cunauth;
code = Cfailure;
syslog(0, LOG, ": remote=%I: auth failed: %r, uid=%s",
ppp->remote, uid);
}else{
c->state = Cauthok;
code = Csuccess;
syslog(0, LOG, ": remote=%I: auth ok: uid=%s nsecret=%d",
ppp->remote, uid, c->ai->nsecret);
}
auth_freechal(c->cs);
c->cs = nil;
freeb(b);
/* send reply */
if(code == Csuccess && c->proto == APmschapv2 && c->ai->nsecret == 16+20){
b = alloclcp(code, c->id, 4+2+2*20+1, &m);
b->wptr += sprint((char*)m->data, "S=%.20H", c->ai->secret+16);
} else {
b = alloclcp(code, c->id, 4, &m);
}
hnputs(m->len, BLEN(b));
putframe(ppp, Pchap, b);
if(c->state == Cauthok){
setppekey(ppp, 1);
setphase(ppp, Pnet);
} else {
/* restart chapp negotiation */
chapinit(ppp);
}
break;
case Csuccess:
if(c->proto == APmschapv2 && c->ai != nil && c->ai->nsecret == 16+20){
n = snprint((char*)resp, sizeof(resp), "S=%.20H", c->ai->secret+16);
if(len - 4 < n || tsmemcmp(m->data, resp, n) != 0){
netlog("ppp: chap: bad authenticator\n");
terminate(ppp, "chap: bad authenticator", 0);
break;
}
}
netlog("ppp: chap succeeded\n");
setppekey(ppp, 0);
setphase(ppp, Pnet);
break;
case Cfailure:
netlog("ppp: chap failed\n");
terminate(ppp, "chap failed", 0);
break;
default:
syslog(0, LOG, "chap code %d?", m->code);
break;
}
qunlock(ppp);
freeb(b);
}
static void
putpaprequest(PPP *ppp)
{
Block *b;
Lcpmsg *m;
Chap *c;
UserPasswd *up;
int len, nlen, slen;
up = auth_getuserpasswd(auth_getkey, "proto=pass service=ppp %s", keyspec);
if(up == nil){
char err[ERRMAX];
snprint(err, sizeof(err), "auth_getuserpasswd: %r");
terminate(ppp, err, 1);
}
c = ppp->chap;
c->id++;
netlog("ppp: pap: send authreq %d %s %s\n", c->id, up->user, "****");
nlen = strlen(up->user);
slen = strlen(up->passwd);
len = 4 + 1 + nlen + 1 + slen;
b = alloclcp(Pauthreq, c->id, len, &m);
*b->wptr++ = nlen;
memmove(b->wptr, up->user, nlen);
b->wptr += nlen;
*b->wptr++ = slen;
memmove(b->wptr, up->passwd, slen);
b->wptr += slen;
hnputs(m->len, len);
memset(up->user, 0, nlen); /* no leaks */
memset(up->passwd, 0, slen); /* no leaks */
free(up);
putframe(ppp, Ppasswd, b);
memset(b->rptr, 0, BLEN(b)); /* no leaks */
freeb(b);
}
static void
papinit(PPP *ppp)
{
ppp->chap->id = 0;
putpaprequest(ppp);
}
static void
getpap(PPP *ppp, Block *b)
{
Lcpmsg *m;
int len;
m = (Lcpmsg*)b->rptr;
len = 4;
if(BLEN(b) < 4 || BLEN(b) < (len = nhgets(m->len))){
syslog(0, LOG, "short pap message (%zd < %d)", BLEN(b), len);
freeb(b);
return;
}
if(len < sizeof(Lcpmsg))
m->data[0] = 0;
qlock(ppp);
switch(m->code){
case Pauthreq:
netlog("ppp: pap auth request, not supported\n");
break;
case Pauthack:
if(ppp->phase == Pauth
&& ppp->chap->proto == APpasswd
&& m->id <= ppp-> chap->id){
netlog("ppp: pap succeeded\n");
setphase(ppp, Pnet);
}
break;
case Pauthnak:
if(ppp->phase == Pauth
&& ppp->chap->proto == APpasswd
&& m->id <= ppp-> chap->id){
netlog("ppp: pap failed (%d:%.*s)\n",
m->data[0], utfnlen((char*)m->data+1, m->data[0]), (char*)m->data+1);
terminate(ppp, "pap failed", 0);
}
break;
default:
netlog("ppp: unknown pap messsage %d\n", m->code);
}
qunlock(ppp);
freeb(b);
}
static void
printopts(Pstate *p, Block *b, int send)
{
Lcpmsg *m;
Lcpopt *o;
int proto, x, period;
uchar *cp;
char *code, *dir;
m = (Lcpmsg*)b->rptr;
switch(m->code) {
default: code = "<unknown>"; break;
case Lconfreq: code = "confrequest"; break;
case Lconfack: code = "confack"; break;
case Lconfnak: code = "confnak"; break;
case Lconfrej: code = "confreject"; break;
}
if(send)
dir = "send";
else
dir = "recv";
netlog("ppp: %s %s: id=%d\n", dir, code, m->id);
for(cp = m->data; cp < b->wptr; cp += o->len){
o = (Lcpopt*)cp;
if(cp + o->len > b->wptr || o->len < 2){
netlog("\tbad option length %ux\n", o->type);
return;
}
switch(p->proto){
case Plcp:
switch(o->type){
default:
netlog("\tunknown %d len=%d\n", o->type, o->len);
break;
case Omtu:
netlog("\tmtu = %d\n", nhgets(o->data));
break;
case Octlmap:
netlog("\tctlmap = %ux\n", nhgetl(o->data));
break;
case Oauth:
netlog("\tauth = %ux", nhgetl(o->data));
proto = nhgets(o->data);
switch(proto) {
default:
netlog("unknown auth proto %d\n", proto);
break;
case Ppasswd:
netlog("password\n");
break;
case Pchap:
netlog("chap %ux\n", o->data[2]);
break;
}
break;
case Oquality:
proto = nhgets(o->data);
switch(proto) {
default:
netlog("\tunknown quality proto %d\n", proto);
break;
case Plqm:
x = nhgetl(o->data+2)*10;
period = (x+Period-1)/Period;
netlog("\tlqm period = %d\n", period);
break;
}
case Omagic:
netlog("\tmagic = %ux\n", nhgetl(o->data));
break;
case Opc:
netlog("\tprotocol compress\n");
break;
case Oac:
netlog("\taddr compress\n");
break;
}
break;
case Pccp:
switch(o->type){
default:
netlog("\tunknown %d len=%d\n", o->type, o->len);
break;
case Ocoui:
netlog("\tOUI\n");
break;
case Ocstac:
netlog("\tstac LZS\n");
break;
case Ocmppc:
netlog("\tMicrosoft PPC len=%d %ux\n", o->len, nhgetl(o->data));
break;
case Octhwack:
netlog("\tThwack\n");
break;
}
break;
case Pecp:
switch(o->type){
default:
netlog("\tunknown %d len=%d\n", o->type, o->len);
break;
case Oeoui:
netlog("\tOUI\n");
break;
case Oedese:
netlog("\tDES\n");
break;
}
break;
case Pipcp:
switch(o->type){
default:
netlog("\tunknown %d len=%d\n", o->type, o->len);
break;
case Oipaddrs:
netlog("\tip addrs - deprecated\n");
break;
case Oipcompress:
netlog("\tip compress\n");
break;
case Oipaddr:
netlog("\tip addr %V\n", o->data);
break;
case Oipdns:
netlog("\tdns addr %V\n", o->data);
break;
case Oipwins:
netlog("\twins addr %V\n", o->data);
break;
case Oipdns2:
netlog("\tdns2 addr %V\n", o->data);
break;
case Oipwins2:
netlog("\twins2 addr %V\n", o->data);
break;
}
break;
case Pipv6cp:
switch(o->type){
default:
netlog("\tunknown %d len=%d\n", o->type, o->len);
break;
case Oipv6eui:
netlog("\tipv6eui %.*H\n", o->len, o->data);
break;
}
break;
}
}
}
static void
sendtermreq(PPP *ppp, Pstate *p)
{
Block *b;
Lcpmsg *m;
p->termid = ++(p->id);
b = alloclcp(Ltermreq, p->termid, 4, &m);
hnputs(m->len, 4);
putframe(ppp, p->proto, b);
freeb(b);
newstate(ppp, p, Sclosing);
}
static void
sendechoreq(PPP *ppp, Pstate *p)
{
Block *b;
Lcpmsg *m;
p->termid = ++(p->id);
b = alloclcp(Lechoreq, p->id, 8, &m);
hnputl(b->wptr, ppp->magic);
b->wptr += 4;
hnputs(m->len, 8);
putframe(ppp, p->proto, b);
freeb(b);
}
enum
{
CtrlD = 0x4,
CtrlE = 0x5,
CtrlO = 0xf,
Cr = 13,
View = 0x80,
};
int conndone;
static void
xfer(int fd)
{
int i, n;
uchar xbuf[128];
for(;;) {
n = read(fd, xbuf, sizeof(xbuf));
if(n < 0)
break;
if(conndone)
break;
for(i = 0; i < n; i++)
if(xbuf[i] == Cr)
xbuf[i] = ' ';
write(1, xbuf, n);
}
close(fd);
}
static int
readcr(int fd, char *buf, int nbuf)
{
char c;
int n, tot;
tot = 0;
while((n=read(fd, &c, 1)) == 1){
if(c == '\n'){
buf[tot] = 0;
return tot;
}
buf[tot++] = c;
if(tot == nbuf)
sysfatal("line too long in readcr");
}
return n;
}
static void
connect(int fd, int cfd)
{
int n, ctl;
char xbuf[128];
if (chatfile) {
int chatfd, lineno, nb;
char *buf, *p, *s, response[128];
Dir *dir;
if ((chatfd = open(chatfile, OREAD)) < 0)
sysfatal("cannot open %s: %r", chatfile);
if ((dir = dirfstat(chatfd)) == nil)
sysfatal("cannot fstat %s: %r",chatfile);
buf = (char *)malloc(dir->length + 1);
assert(buf);
if ((nb = read(chatfd, buf, dir->length)) < 0)
sysfatal("cannot read chatfile %s: %r", chatfile);
assert(nb == dir->length);
buf[dir->length] = '\0';
free(dir);
close(chatfd);
p = buf;
lineno = 0;
for(;;) {
char *_args[3];
if ((s = strchr(p, '\n')) == nil)
break;
*s++ = '\0';
lineno++;
if (*p == '#') {
p = s;
continue;
}
if (tokenize(p, _args, 3) != 2)
sysfatal("invalid line %d (line expected: 'send' 'expect')",
lineno);
if (debug)
print("sending %s, expecting %s\n", _args[0], _args[1]);
if(strlen(_args[0])){
nb = fprint(fd, "%s\r", _args[0]);
assert(nb > 0);
}
if (strlen(_args[1]) > 0) {
if ((nb = readcr(fd, response, sizeof response-1)) < 0)
sysfatal("cannot read response from: %r");
if (debug)
print("response %s\n", response);
if (nb == 0)
sysfatal("eof on input?");
if (cistrstr(response, _args[1]) == nil)
sysfatal("expected %s, got %s", _args[1], response);
}
p = s;
}
free(buf);
return;
}
print("Connect to file system now, type ctrl-d when done.\n");
print("...(Use the view or down arrow key to send a break)\n");
print("...(Use ctrl-e to set even parity or ctrl-o for odd)\n");
ctl = open("/dev/consctl", OWRITE);
if(ctl < 0)
sysfatal("opening consctl");
fprint(ctl, "rawon");
fd = dup(fd, -1);
conndone = 0;
switch(rfork(RFPROC|RFMEM|RFNOWAIT)){
case -1:
sysfatal("forking xfer");
case 0:
xfer(fd);
exits(nil);
}
for(;;){
read(0, xbuf, 1);
switch(xbuf[0]&0xff) {
case CtrlD: /* done */
conndone = 1;
close(ctl);
print("\n");
return;
case CtrlE: /* set even parity */
fprint(cfd, "pe");
break;
case CtrlO: /* set odd parity */
fprint(cfd, "po");
break;
case View: /* send a break */
fprint(cfd, "k500");
break;
default:
n = write(fd, xbuf, 1);
if(n < 0) {
errstr(xbuf, sizeof(xbuf));
conndone = 1;
close(ctl);
print("[remote write error (%s)]\n", xbuf);
return;
}
}
}
}
int interactive;
void
usage(void)
{
fprint(2, "usage: ppp [-CPSacdfuy] [-b baud] [-k keyspec] [-m mtu] "
"[-M chatfile] [-p dev] [-x netmntpt] [-t modemcmd] [-U duid] "
"[local-addr [remote-addr]]\n");
exits("usage");
}
void
main(int argc, char **argv)
{
static PPP ppp[1];
int mtu, framing, user, mediain, mediaout, cfd;
Ipaddr ipaddr[2], remip[2];
char *dev, *duid, *modemcmd;
char net[128];
int pfd[2];
char buf[128];
quotefmtinstall();
fmtinstall('I', eipfmt);
fmtinstall('V', eipfmt);
fmtinstall('E', eipfmt);
fmtinstall('H', encodefmt);
invalidate(ipaddr[0]);
invalidate(ipaddr[1]);
invalidate(remip[0]);
invalidate(remip[1]);
dev = nil;
mtu = Defmtu;
framing = 0;
duid = nil;
setnetmtpt(net, sizeof(net), nil);
user = 0;
modemcmd = nil;
ARGBEGIN{
case 'a':
noauth = 1;
break;
case 'b':
baud = atoi(EARGF(usage()));
if(baud < 0)
baud = 0;
break;
case 'c':
nocompress = 1;
break;
case 'C':
noipcompress = 1;
break;
case 'd':
debug++;
break;
case 'f':
framing = 1;
break;
case 'F':
pppframing = 0;
break;
case 'k':
keyspec = EARGF(usage());
break;
case 'm':
mtu = atoi(EARGF(usage()));
if(mtu < Minmtu)
mtu = Minmtu;
if(mtu > Maxmtu)
mtu = Maxmtu;
break;
case 'M':
chatfile = EARGF(usage());
break;
case 'p':
dev = EARGF(usage());
break;
case 'P': /* this seems reversed compared to ipconfig */
primary = 1;
break;
case 'S':
server = 1;
break;
case 't':
modemcmd = EARGF(usage());
break;
case 'U':
duid = EARGF(usage());
break;
case 'u':
user = 1;
break;
case 'x':
setnetmtpt(net, sizeof net, EARGF(usage()));
break;
case 'y':
proxy = 1;
break;
default:
fprint(2, "unknown option %c\n", ARGC());
usage();
}ARGEND;
switch(argc){
case 4: /* [local [remote [local2 [remote2]]]] */
if (parseip(remip[1], argv[3]) == -1)
sysfatal("bad ip %s", argv[3]);
case 3: /* [local [remote [local2]]] */
if (parseip(ipaddr[1], argv[2]) == -1)
sysfatal("bad ip %s", argv[2]);
case 2: /* [local [remote]] */
if (parseip(remip[0], argv[1]) == -1)
sysfatal("bad ip %s", argv[1]);
case 1: /* [local] */
if (parseip(ipaddr[0], argv[0]) == -1)
sysfatal("bad ip %s", argv[0]);
if (argc == 2 && isv4(ipaddr[0]) != isv4(remip[0])){
ipmove(ipaddr[1], remip[0]);
invalidate(remip[0]);
} else if(argc > 2 && isv4(ipaddr[0]) != isv4(remip[0]) && isv4(remip[0]) != isv4(ipaddr[1])) {
Ipaddr tmp;
ipmove(tmp, remip[0]);
ipmove(remip[0], ipaddr[1]);
ipmove(ipaddr[1], tmp);
}
case 0:
break;
default:
usage();
}
if(dev != nil){
mediain = open(dev, ORDWR);
if(mediain < 0){
if(strchr(dev, '!')){
if((mediain = dial(dev, 0, 0, &cfd)) == -1){
fprint(2, "%s: couldn't dial %s: %r\n", argv0, dev);
exits(dev);
}
} else {
fprint(2, "%s: couldn't open %s\n", argv0, dev);
exits(dev);
}
} else {
snprint(buf, sizeof buf, "%sctl", dev);
cfd = open(buf, ORDWR);
}
if(cfd >= 0){
if(baud)
fprint(cfd, "b%d", baud);
fprint(cfd, "m1"); /* cts/rts flow control (and fifo's) on */
fprint(cfd, "q64000"); /* increase q size to 64k */
fprint(cfd, "n1"); /* nonblocking writes on */
fprint(cfd, "r1"); /* rts on */
fprint(cfd, "d1"); /* dtr on */
fprint(cfd, "c1"); /* dcdhup on */
if(user || chatfile)
connect(mediain, cfd);
close(cfd);
} else {
if(user || chatfile)
connect(mediain, -1);
}
mediaout = dup(mediain, -1);
} else {
mediain = open("/fd/0", OREAD);
if(mediain < 0){
fprint(2, "%s: couldn't open /fd/0\n", argv0);
exits("/fd/0");
}
mediaout = open("/fd/1", OWRITE);
if(mediaout < 0){
fprint(2, "%s: couldn't open /fd/0\n", argv0);
exits("/fd/1");
}
}
if(modemcmd != nil && mediaout >= 0)
fprint(mediaout, "%s\r", modemcmd);
if(pipe(pfd) < 0){
fprint(2, "%s: can't create pipe\n", argv0);
exits("pipe");
}
switch(rfork(RFFDG|RFREND|RFPROC|RFNOTEG|RFNOWAIT)){
case -1:
fprint(2, "%s: can't fork\n", argv0);
exits("fork");
case 0:
close(pfd[0]);
pppopen(ppp, mediain, mediaout, pfd[1], net, dev, ipaddr, remip, mtu, framing, duid);
exits(nil);
default:
/* read commands from pipe */
dup(pfd[0], 0);
close(pfd[0]);
close(pfd[1]);
close(mediain);
close(mediaout);
/* stdout to stderr */
dup(2, 1);
}
/* become a shell, reading commands from pipe */
execl("/bin/rc", "rc", nil);
exits("exec");
}
void
netlog(char *fmt, ...)
{
va_list arg;
char *m;
static long start;
long now;
if(debug == 0)
return;
now = time(0);
if(start == 0)
start = now;
va_start(arg, fmt);
m = vsmprint(fmt, arg);
fprint(2, "%ld %s", now-start, m);
free(m);
va_end(arg);
}
/*
* return non-zero if this is a valid v4 address
*/
static int
validv4(Ipaddr addr)
{
return memcmp(addr, v4prefix, IPv4off) == 0 && memcmp(addr, v4prefix, IPaddrlen) != 0;
}
static void
invalidate(Ipaddr addr)
{
ipmove(addr, IPnoaddr);
}
static uchar v6llprefix[16] = {
0xfe, 0x80, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
};
enum {
v6llprefixlen = 8,
};
/*
* return non-zero when addr is a valid link-local ipv6 address
*/
static int
validv6(Ipaddr addr)
{
return memcmp(addr, v6llprefix, v6llprefixlen) == 0 && memcmp(addr, v6llprefix, IPaddrlen) != 0;
}
/*
* convert EUI-64 or EUI-48 to link-local ipv6 address,
* return non-zero when successfull or zero on failure.
*/
static int
euitov6(Ipaddr addr, uchar *data, int len)
{
if(len < 1 || len > IPaddrlen-v6llprefixlen){
invalidate(addr);
return 0;
}
ipmove(addr, v6llprefix);
memmove(&addr[IPaddrlen-len], data, len);
return memcmp(addr, v6llprefix, IPaddrlen) != 0;
}