// deliver new content c to all clients with (loosely) matching interest,
// but only one copy per face
// returns: number of forwards
int
ccnl_content_serve_pending(struct ccnl_relay_s *ccnl, struct ccnl_content_s *c)
{
struct ccnl_interest_s *i;
struct ccnl_face_s *f;
int cnt = 0;
DEBUGMSG_CORE(TRACE, "ccnl_content_serve_pending\n");
for (f = ccnl->faces; f; f = f->next){
f->flags &= ~CCNL_FACE_FLAGS_SERVED; // reply on a face only once
}
for (i = ccnl->pit; i;) {
struct ccnl_pendint_s *pi;
if (!i->pkt->pfx)
continue;
switch (i->pkt->pfx->suite) {
#ifdef USE_SUITE_CCNB
case CCNL_SUITE_CCNB:
if (!ccnl_i_prefixof_c(i->pkt->pfx, i->pkt->s.ccnb.minsuffix,
i->pkt->s.ccnb.maxsuffix, c)) {
// XX must also check i->ppkd
i = i->next;
continue;
}
break;
#endif
#ifdef USE_SUITE_CCNTLV
case CCNL_SUITE_CCNTLV:
if (ccnl_prefix_cmp(c->pkt->pfx, NULL, i->pkt->pfx, CMP_EXACT)) {
// XX must also check keyid
i = i->next;
continue;
}
break;
#endif
#ifdef USE_SUITE_CISTLV
case CCNL_SUITE_CISTLV:
if (ccnl_prefix_cmp(c->pkt->pfx, NULL, i->pkt->pfx, CMP_EXACT)) {
// XX must also check keyid
i = i->next;
continue;
}
break;
#endif
#ifdef USE_SUITE_IOTTLV
case CCNL_SUITE_IOTTLV:
if (ccnl_prefix_cmp(c->pkt->pfx, NULL, i->pkt->pfx, CMP_EXACT)) {
// XX must also check keyid
i = i->next;
continue;
}
break;
#endif
#ifdef USE_SUITE_NDNTLV
case CCNL_SUITE_NDNTLV:
if (!ccnl_i_prefixof_c(i->pkt->pfx, i->pkt->s.ndntlv.minsuffix,
i->pkt->s.ndntlv.maxsuffix, c)) {
// XX must also check i->ppkl,
i = i->next;
continue;
}
break;
#endif
default:
i = i->next;
continue;
}
//Hook for add content to cache by callback:
if(i && ! i->pending){
DEBUGMSG_CORE(WARNING, "releasing interest 0x%p OK?\n", (void*)i);
c->flags |= CCNL_CONTENT_FLAGS_STATIC;
i = ccnl_interest_remove(ccnl, i);
return 1;
}
// CONFORM: "Data MUST only be transmitted in response to
// an Interest that matches the Data."
for (pi = i->pending; pi; pi = pi->next) {
if (pi->face->flags & CCNL_FACE_FLAGS_SERVED)
continue;
pi->face->flags |= CCNL_FACE_FLAGS_SERVED;
if (pi->face->ifndx >= 0) {
DEBUGMSG_CFWD(INFO, " outgoing data=<%s>%s to=%s\n",
ccnl_prefix_to_path(i->pkt->pfx),
ccnl_suite2str(i->pkt->pfx->suite),
ccnl_addr2ascii(&pi->face->peer));
DEBUGMSG_CORE(VERBOSE, " Serve to face: %d (pkt=%p)\n",
pi->face->faceid, (void*) c->pkt);
ccnl_nfn_monitor(ccnl, pi->face, c->pkt->pfx,
c->pkt->content, c->pkt->contlen);
ccnl_face_enqueue(ccnl, pi->face, buf_dup(c->pkt->buf));
} else {// upcall to deliver content to local client
ccnl_app_RX(ccnl, c);
}
c->served_cnt++;
cnt++;
}
i = ccnl_interest_remove(ccnl, i);
}
return cnt;
}
int
ccnl_ccnb_forwarder(struct ccnl_relay_s *relay, struct ccnl_face_s *from,
unsigned char **data, int *datalen)
{
int rc= -1, scope=3, aok=3, minsfx=0, maxsfx=CCNL_MAX_NAME_COMP, contlen;
struct ccnl_buf_s *buf = 0, *nonce=0, *ppkd=0;
struct ccnl_interest_s *i = 0;
struct ccnl_content_s *c = 0;
struct ccnl_prefix_s *p = 0;
unsigned char *content = 0;
DEBUGMSG(99, "ccnl/ccnb forwarder (%d bytes left)\n", *datalen);
buf = ccnl_ccnb_extract(data, datalen, &scope, &aok, &minsfx,
&maxsfx, &p, &nonce, &ppkd, &content, &contlen);
if (!buf) {
DEBUGMSG(6, " parsing error or no prefix\n"); goto Done;
}
if (nonce && ccnl_nonce_find_or_append(relay, nonce)) {
DEBUGMSG(6, " dropped because of duplicate nonce\n"); goto Skip;
}
if (buf->data[0] == 0x01 && buf->data[1] == 0xd2) { // interest
DEBUGMSG(6, " interest=<%s>\n", ccnl_prefix_to_path(p));
ccnl_print_stats(relay, STAT_RCV_I); //log count recv_interest
if (p->compcnt > 0 && p->comp[0][0] == (unsigned char) 0xc1) goto Skip;
if (p->compcnt == 4 && !memcmp(p->comp[0], "ccnx", 4)) {
rc = ccnl_mgmt(relay, buf, p, from); goto Done;
}
// CONFORM: Step 1:
if ( aok & 0x01 ) { // honor "answer-from-existing-content-store" flag
for (c = relay->contents; c; c = c->next) {
if (c->suite != CCNL_SUITE_CCNB) continue;
if (!ccnl_i_prefixof_c(p, minsfx, maxsfx, c)) continue;
if (ppkd && !buf_equal(ppkd, c->details.ccnb.ppkd)) continue;
// FIXME: should check stale bit in aok here
DEBUGMSG(7, " matching content for interest, content %p\n", (void *) c);
ccnl_print_stats(relay, STAT_SND_C); //log sent_c
if (from->ifndx >= 0)
ccnl_face_enqueue(relay, from, buf_dup(c->pkt));
else
ccnl_app_RX(relay, c);
goto Skip;
}
}
// CONFORM: Step 2: check whether interest is already known
for (i = relay->pit; i; i = i->next) {
if (i->suite == CCNL_SUITE_CCNB &&
!ccnl_prefix_cmp(i->prefix, NULL, p, CMP_EXACT) &&
i->details.ccnb.minsuffix == minsfx &&
i->details.ccnb.maxsuffix == maxsfx &&
((!ppkd && !i->details.ccnb.ppkd) ||
buf_equal(ppkd, i->details.ccnb.ppkd)) )
break;
}
if (!i) { // this is a new/unknown I request: create and propagate
i = ccnl_interest_new(relay, from, CCNL_SUITE_CCNB,
&buf, &p, minsfx, maxsfx);
if (ppkd)
i->details.ccnb.ppkd = ppkd, ppkd = NULL;
if (i) { // CONFORM: Step 3 (and 4)
DEBUGMSG(7, " created new interest entry %p\n", (void *) i);
if (scope > 2)
ccnl_interest_propagate(relay, i);
}
} else if (scope > 2 && (from->flags & CCNL_FACE_FLAGS_FWDALLI)) {
DEBUGMSG(7, " old interest, nevertheless propagated %p\n", (void *) i);
ccnl_interest_propagate(relay, i);
}
if (i) { // store the I request, for the incoming face (Step 3)
DEBUGMSG(7, " appending interest entry %p\n", (void *) i);
ccnl_interest_append_pending(i, from);
}
} else { // content
DEBUGMSG(6, " content=<%s>\n", ccnl_prefix_to_path(p));
ccnl_print_stats(relay, STAT_RCV_C); //log count recv_content
#ifdef USE_SIGNATURES
if (p->compcnt == 2 && !memcmp(p->comp[0], "ccnx", 4)
&& !memcmp(p->comp[1], "crypto", 6) &&
from == relay->crypto_face) {
rc = ccnl_crypto(relay, buf, p, from); goto Done;
}
#endif /*USE_SIGNATURES*/
// CONFORM: Step 1:
for (c = relay->contents; c; c = c->next)
if (buf_equal(c->pkt, buf)) goto Skip; // content is dup
c = ccnl_content_new(relay, CCNL_SUITE_CCNB,
&buf, &p, &ppkd, content, contlen);
if (c) { // CONFORM: Step 2 (and 3)
if (!ccnl_content_serve_pending(relay, c)) { // unsolicited content
// CONFORM: "A node MUST NOT forward unsolicited data [...]"
DEBUGMSG(7, " removed because no matching interest\n");
free_content(c);
goto Skip;
}
if (relay->max_cache_entries != 0) { // it's set to -1 or a limit
DEBUGMSG(7, " adding content to cache\n");
ccnl_content_add2cache(relay, c);
} else {
DEBUGMSG(7, " content not added to cache\n");
free_content(c);
}
}
}
Skip:
rc = 0;
Done:
free_prefix(p);
free_3ptr_list(buf, nonce, ppkd);
return rc;
}