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If we don't receive a TY_IPADDR option as part of a configure request, NAK

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as if we received one with 0.0.0.0 as the argument.
This commit is contained in:
Brian Somers 2001-05-22 09:03:30 +00:00
parent 0a13f04ebe
commit 5f73635b93
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=76986
1 changed files with 80 additions and 62 deletions
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142
usr.sbin/ppp/ipcp.c
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@ -1057,20 +1057,91 @@ AcceptableAddr(const struct in_range *prange, struct in_addr ipaddr)
(ipaddr.s_addr & prange->mask.s_addr) && ipaddr.s_addr;
}
static void
ipcp_ValidateReq(struct ipcp *ipcp, struct in_addr ip, struct fsm_decode *dec)
{
struct bundle *bundle = ipcp->fsm.bundle;
struct iface *iface = bundle->iface;
int n;
if (iplist_isvalid(&ipcp->cfg.peer_list)) {
if (ip.s_addr == INADDR_ANY ||
iplist_ip2pos(&ipcp->cfg.peer_list, ip) < 0 ||
ipcp_SetIPaddress(bundle, ipcp->cfg.my_range.ipaddr, ip, 1)) {
log_Printf(LogIPCP, "%s: Address invalid or already in use\n",
inet_ntoa(ip));
/*
* If we've already had a valid address configured for the peer,
* try NAKing with that so that we don't have to upset things
* too much.
*/
for (n = 0; n < iface->in_addrs; n++)
if (iplist_ip2pos(&ipcp->cfg.peer_list, iface->in_addr[n].brd) >= 0) {
ipcp->peer_ip = iface->in_addr[n].brd;
break;
}
if (n == iface->in_addrs)
/* Just pick an IP number from our list */
ipcp->peer_ip = ChooseHisAddr(bundle, ipcp->cfg.my_range.ipaddr);
if (ipcp->peer_ip.s_addr == INADDR_ANY) {
*dec->rejend++ = TY_IPADDR;
*dec->rejend++ = 6;
memcpy(dec->rejend, &ip.s_addr, 4);
dec->rejend += 4;
} else {
*dec->nakend++ = TY_IPADDR;
*dec->nakend++ = 6;
memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4);
dec->nakend += 4;
}
return;
}
} else if (!AcceptableAddr(&ipcp->cfg.peer_range, ip)) {
/*
* If the destination address is not acceptable, NAK with what we
* want to use.
*/
*dec->nakend++ = TY_IPADDR;
*dec->nakend++ = 6;
for (n = 0; n < iface->in_addrs; n++)
if ((iface->in_addr[n].brd.s_addr & ipcp->cfg.peer_range.mask.s_addr)
== (ipcp->cfg.peer_range.ipaddr.s_addr &
ipcp->cfg.peer_range.mask.s_addr)) {
/* We prefer the already-configured address */
memcpy(dec->nakend, &iface->in_addr[n].brd.s_addr, 4);
break;
}
if (n == iface->in_addrs)
memcpy(dec->nakend, &ipcp->peer_ip.s_addr, 4);
dec->nakend += 4;
return;
}
ipcp->peer_ip = ip;
*dec->ackend++ = TY_IPADDR;
*dec->ackend++ = 6;
memcpy(dec->ackend, &ip.s_addr, 4);
dec->ackend += 4;
}
static void
IpcpDecodeConfig(struct fsm *fp, u_char *cp, int plen, int mode_type,
struct fsm_decode *dec)
{
/* Deal with incoming PROTO_IPCP */
struct iface *iface = fp->bundle->iface;
struct ipcp *ipcp = fsm2ipcp(fp);
int type, length, gotdnsnak, n;
int type, length, gotdnsnak, ipaddr_req;
u_int32_t compproto;
struct compreq *pcomp;
struct in_addr ipaddr, dstipaddr, have_ip;
char tbuff[100], tbuff2[100];
gotdnsnak = 0;
ipaddr_req = 0;
while (plen >= sizeof(struct fsmconfig)) {
type = *cp;
@ -1090,66 +1161,8 @@ IpcpDecodeConfig(struct fsm *fp, u_char *cp, int plen, int mode_type,
switch (mode_type) {
case MODE_REQ:
if (iplist_isvalid(&ipcp->cfg.peer_list)) {
if (ipaddr.s_addr == INADDR_ANY ||
iplist_ip2pos(&ipcp->cfg.peer_list, ipaddr) < 0 ||
ipcp_SetIPaddress(fp->bundle, ipcp->cfg.my_range.ipaddr,
ipaddr, 1)) {
log_Printf(LogIPCP, "%s: Address invalid or already in use\n",
inet_ntoa(ipaddr));
/*
* If we've already had a valid address configured for the peer,
* try NAKing with that so that we don't have to upset things
* too much.
*/
for (n = 0; n < iface->in_addrs; n++)
if (iplist_ip2pos(&ipcp->cfg.peer_list, iface->in_addr[n].brd)
>=0) {
ipcp->peer_ip = iface->in_addr[n].brd;
break;
}
if (n == iface->in_addrs)
/* Just pick an IP number from our list */
ipcp->peer_ip = ChooseHisAddr
(fp->bundle, ipcp->cfg.my_range.ipaddr);
if (ipcp->peer_ip.s_addr == INADDR_ANY) {
memcpy(dec->rejend, cp, length);
dec->rejend += length;
} else {
memcpy(dec->nakend, cp, 2);
memcpy(dec->nakend + 2, &ipcp->peer_ip.s_addr, length - 2);
dec->nakend += length;
}
break;
}
} else if (!AcceptableAddr(&ipcp->cfg.peer_range, ipaddr)) {
/*
* If destination address is not acceptable, NAK with what we
* want to use.
*/
memcpy(dec->nakend, cp, 2);
for (n = 0; n < iface->in_addrs; n++)
if ((iface->in_addr[n].brd.s_addr &
ipcp->cfg.peer_range.mask.s_addr)
== (ipcp->cfg.peer_range.ipaddr.s_addr &
ipcp->cfg.peer_range.mask.s_addr)) {
/* We prefer the already-configured address */
memcpy(dec->nakend + 2, &iface->in_addr[n].brd.s_addr,
length - 2);
break;
}
if (n == iface->in_addrs)
memcpy(dec->nakend + 2, &ipcp->peer_ip.s_addr, length - 2);
dec->nakend += length;
break;
}
ipcp->peer_ip = ipaddr;
memcpy(dec->ackend, cp, length);
dec->ackend += length;
ipaddr_req = 1;
ipcp_ValidateReq(ipcp, ipaddr, dec);
break;
case MODE_NAK:
@ -1396,6 +1409,11 @@ IpcpDecodeConfig(struct fsm *fp, u_char *cp, int plen, int mode_type,
}
if (mode_type != MODE_NOP) {
if (mode_type == MODE_REQ && !ipaddr_req) {
/* We *REQUIRE* that the peer requests an IP address */
ipaddr.s_addr = INADDR_ANY;
ipcp_ValidateReq(ipcp, ipaddr, dec);
}
if (dec->rejend != dec->rej) {
/* rejects are preferred */
dec->ackend = dec->ack;