/*
* findpeer - find and return a peer in the hash table.
*/
struct peer *
findpeer(
struct sockaddr_storage *srcadr,
struct interface *dstadr,
int pkt_mode,
int *action
)
{
register struct peer *peer;
int hash;
findpeer_calls++;
hash = NTP_HASH_ADDR(srcadr);
for (peer = peer_hash[hash]; peer != NULL; peer = peer->next) {
if (SOCKCMP(srcadr, &peer->srcadr) &&
NSRCPORT(srcadr) == NSRCPORT(&peer->srcadr)) {
/*
* if the association matching rules determine
* that this is not a valid combination, then
* look for the next valid peer association.
*/
*action = MATCH_ASSOC(peer->hmode, pkt_mode);
/*
* if an error was returned, exit back right
* here.
*/
if (*action == AM_ERR)
return ((struct peer *)0);
/*
* if a match is found, we stop our search.
*/
if (*action != AM_NOMATCH)
break;
}
}
/*
* If no matching association is found
*/
if (peer == 0) {
*action = MATCH_ASSOC(NO_PEER, pkt_mode);
return ((struct peer *)0);
}
set_peerdstadr(peer, dstadr);
return (peer);
}
/*
* findpeer - find and return a peer match for a received datagram in
* the peer_hash table.
*/
struct peer *
findpeer(
struct recvbuf *rbufp,
int pkt_mode,
int * action
)
{
struct peer * p;
sockaddr_u * srcadr;
u_int hash;
struct pkt * pkt;
l_fp pkt_org;
findpeer_calls++;
srcadr = &rbufp->recv_srcadr;
hash = NTP_HASH_ADDR(srcadr);
for (p = peer_hash[hash]; p != NULL; p = p->adr_link) {
if (ADDR_PORT_EQ(srcadr, &p->srcadr)) {
/*
* if the association matching rules determine
* that this is not a valid combination, then
* look for the next valid peer association.
*/
*action = MATCH_ASSOC(p->hmode, pkt_mode);
/*
* A response to our manycastclient solicitation
* might be misassociated with an ephemeral peer
* already spun for the server. If the packet's
* org timestamp doesn't match the peer's, check
* if it matches the ACST prototype peer's. If
* so it is a redundant solicitation response,
* return AM_ERR to discard it. [Bug 1762]
*/
if (MODE_SERVER == pkt_mode &&
AM_PROCPKT == *action) {
pkt = &rbufp->recv_pkt;
NTOHL_FP(&pkt->org, &pkt_org);
if (!L_ISEQU(&p->aorg, &pkt_org) &&
findmanycastpeer(rbufp))
*action = AM_ERR;
}
/*
* if an error was returned, exit back right
* here.
*/
if (*action == AM_ERR)
return NULL;
/*
* if a match is found, we stop our search.
*/
if (*action != AM_NOMATCH)
break;
}
}
/*
* If no matching association is found
*/
if (NULL == p) {
*action = MATCH_ASSOC(NO_PEER, pkt_mode);
} else if (p->dstadr != rbufp->dstadr) {
set_peerdstadr(p, rbufp->dstadr);
if (p->dstadr == rbufp->dstadr) {
DPRINTF(1, ("Changed %s local address to match response\n",
stoa(&p->srcadr)));
return findpeer(rbufp, pkt_mode, action);
}
}
return p;
}
