void ccnl_do_retransmit(void *ptr, void *dummy)
{
(void) dummy; /* unused */
struct ccnl_relay_s *relay = (struct ccnl_relay_s *) ptr;
for (struct ccnl_interest_s *i = relay->pit; i; i = i->next) {
// CONFORM: "Entries in the PIT MUST timeout rather
// than being held indefinitely."
if(i->retries <= CCNL_MAX_INTEREST_RETRANSMIT) {
// CONFORM: "A node MUST retransmit Interest Messages
// periodically for pending PIT entries."
DEBUGMSG(7, " retransmit %d <%s>\n", i->retries,
ccnl_prefix_to_path(i->prefix));
if (i->forwarded_over
&& !(i->forwarded_over->flags & CCNL_FORWARD_FLAGS_STATIC)
&& (i->retries >= CCNL_MAX_INTEREST_OPTIMISTIC)) {
DEBUGMSG(1, " removed dynamic forward %p\n", (void *) i->forwarded_over);
ccnl_forward_remove(relay, i->forwarded_over);
}
i->retries++;
ccnl_interest_propagate(relay, i);
}
}
}
void
ccnl_do_ageing(void *ptr, void *dummy)
{
(void) dummy;
struct ccnl_relay_s *relay = (struct ccnl_relay_s*) ptr;
struct ccnl_content_s *c = relay->contents;
struct ccnl_interest_s *i = relay->pit;
struct ccnl_face_s *f = relay->faces;
time_t t = CCNL_NOW();
DEBUGMSG_CORE(TRACE, "ageing t=%d\n", (int)t);
while (c) {
if ((c->last_used + CCNL_CONTENT_TIMEOUT) <= t &&
!(c->flags & CCNL_CONTENT_FLAGS_STATIC)){
DEBUGMSG_CORE(TRACE, "AGING: CONTENT REMOVE %p\n", (void*) c);
c = ccnl_content_remove(relay, c);
}
else
c = c->next;
}
while (i) { // CONFORM: "Entries in the PIT MUST timeout rather
// than being held indefinitely."
if ((i->last_used + CCNL_INTEREST_TIMEOUT) <= t ||
i->retries > CCNL_MAX_INTEREST_RETRANSMIT) {
DEBUGMSG_CORE(TRACE, "AGING: INTEREST REMOVE %p\n", (void*) i);
DEBUGMSG_CORE(DEBUG, " timeout: remove interest 0x%p <%s>\n",
(void*)i,
ccnl_prefix_to_path(i->pkt->pfx));
i = ccnl_nfn_interest_remove(relay, i);
} else {
// CONFORM: "A node MUST retransmit Interest Messages
// periodically for pending PIT entries."
DEBUGMSG_CORE(DEBUG, " retransmit %d <%s>\n", i->retries,
ccnl_prefix_to_path(i->pkt->pfx));
#ifdef USE_NFN
if (i->flags & CCNL_PIT_COREPROPAGATES){
#endif
DEBUGMSG_CORE(TRACE, "AGING: PROPAGATING INTEREST %p\n", (void*) i);
ccnl_interest_propagate(relay, i);
#ifdef USE_NFN
}
#endif
i->retries++;
i = i->next;
}
}
while (f) {
if (!(f->flags & CCNL_FACE_FLAGS_STATIC) &&
(f->last_used + CCNL_FACE_TIMEOUT) <= t){
DEBUGMSG_CORE(TRACE, "AGING: FACE REMOVE %p\n", (void*) f);
f = ccnl_face_remove(relay, f);
}
else
f = f->next;
}
}
char*
op_builtin_find(struct ccnl_relay_s *ccnl, struct configuration_s *config,
int *restart, int *halt, char *prog, char *pending,
struct stack_s **stack)
{
int local_search = 0;
struct stack_s *h;
char *cp = NULL;
struct ccnl_prefix_s *prefix;
struct ccnl_content_s *c = NULL;
if (*restart) {
DEBUGMSG(DEBUG, "---to do: OP_FIND restart\n");
*restart = 0;
local_search = 1;
} else {
DEBUGMSG(DEBUG, "---to do: OP_FIND <%s> <%s>\n", prog+7, pending);
h = pop_from_stack(&config->result_stack);
// if (h->type != STACK_TYPE_PREFIX) ...
config->fox_state->num_of_params = 1;
config->fox_state->params = ccnl_malloc(sizeof(struct ccnl_stack_s *));
config->fox_state->params[0] = h;
config->fox_state->it_routable_param = 0;
}
prefix = config->fox_state->params[0]->content;
//check if result is now available
//loop by reentering (with local_search) after timeout of the interest...
DEBUGMSG(DEBUG, "FIND: Checking if result was received\n");
c = ccnl_nfn_local_content_search(ccnl, config, prefix);
if (!c) {
struct ccnl_prefix_s *copy;
struct ccnl_interest_s *interest;
if (local_search) {
DEBUGMSG(INFO, "FIND: no content\n");
return NULL;
}
//Result not in cache, search over the network
// struct ccnl_interest_s *interest = mkInterestObject(ccnl, config, prefix);
copy = ccnl_prefix_dup(prefix);
interest = ccnl_nfn_query2interest(ccnl, ©, config);
DEBUGMSG(DEBUG, "FIND: sending new interest from Face ID: %d\n",
interest->from->faceid);
if (interest)
ccnl_interest_propagate(ccnl, interest);
//wait for content, return current program to continue later
*halt = -1; //set halt to -1 for async computations
return ccnl_strdup(prog);
}
DEBUGMSG(INFO, "FIND: result was found ---> handle it (%s), prog=%s, pending=%s\n", ccnl_prefix_to_path(prefix), prog, pending);
#ifdef USE_NACK
/*
if (!strncmp((char*)c->content, ":NACK", 5)) {
DEBUGMSG(DEBUG, "NACK RECEIVED, going to next parameter\n");
++config->fox_state->it_routable_param;
return prog ? ccnl_strdup(prog) : NULL;
}
*/
#endif
prefix = ccnl_prefix_dup(prefix);
push_to_stack(&config->result_stack, prefix, STACK_TYPE_PREFIX);
if (pending) {
DEBUGMSG(DEBUG, "Pending: %s\n", pending);
cp = ccnl_strdup(pending);
}
return cp;
}
int
ccnl_nfn(struct ccnl_relay_s *ccnl, // struct ccnl_buf_s *orig,
struct ccnl_prefix_s *prefix, struct ccnl_face_s *from,
struct configuration_s *config, struct ccnl_interest_s *interest,
int suite, int start_locally)
{
int num_of_required_thunks = 0;
int thunk_request = 0;
struct ccnl_buf_s *res = NULL;
char str[CCNL_MAX_PACKET_SIZE];
int i, len = 0;
DEBUGMSG(TRACE, "ccnl_nfn(%p, %s, %p, config=%p)\n",
(void*)ccnl, ccnl_prefix_to_path(prefix),
(void*)from, (void*)config);
// prefix = ccnl_prefix_dup(prefix);
DEBUGMSG(DEBUG, "Namecomps: %s \n", ccnl_prefix_to_path(prefix));
if (config){
suite = config->suite;
thunk_request = config->fox_state->thunk_request;
goto restart; //do not do parsing thunks again
}
from->flags = CCNL_FACE_FLAGS_STATIC;
if (ccnl_nfn_thunk_already_computing(ccnl, prefix)) {
DEBUGMSG(DEBUG, "Computation for this interest is already running\n");
return -1;
}
if (ccnl_nfnprefix_isTHUNK(prefix))
thunk_request = 1;
// Checks first if the interest has a routing hint and then searches for it locally.
// If it exisits, the computation is started locally, otherwise it is directly forwarded without entering the AM.
// Without this mechanism, there will be situations where several nodes "overtake" a computation
// applying the same strategy and, potentially, all executing it locally (after trying all arguments).
// TODO: this is not an elegant solution and should be improved on, because the clients cannot send a
// computation with a routing hint on which the network applies a strategy if the routable name
// does not exist (because each node will just forward it without ever taking it into an abstract machine).
// encoding the routing hint more explicitely as well as additonal information (e.g. already tried names)
// could solve the problem. More generally speaking, additional state describing the exact situation will be required.
if (interest && interest->prefix->compcnt > 1) { // forward interests with outsourced components
struct ccnl_prefix_s *copy = ccnl_prefix_dup(prefix);
copy->compcnt -= (1 + thunk_request);
DEBUGMSG(DEBUG, " checking local available of %s\n", ccnl_prefix_to_path(copy));
ccnl_nfnprefix_clear(copy, CCNL_PREFIX_NFN | CCNL_PREFIX_THUNK);
if (!ccnl_nfn_local_content_search(ccnl, NULL, copy)) {
free_prefix(copy);
ccnl_interest_propagate(ccnl, interest);
return 0;
}
free_prefix(copy);
start_locally = 1;
}
//put packet together
#ifdef USE_SUITE_CCNTLV
if (prefix->suite == CCNL_SUITE_CCNTLV) {
len = prefix->complen[prefix->compcnt-1] - 4;
memcpy(str, prefix->comp[prefix->compcnt-1] + 4, len);
str[len] = '\0';
} else
#endif
{
len = prefix->complen[prefix->compcnt-1];
memcpy(str, prefix->comp[prefix->compcnt-1], len);
str[len] = '\0';
}
if (prefix->compcnt > 1)
len += sprintf(str + len, " ");
for (i = 0; i < prefix->compcnt-1; i++) {
#ifdef USE_SUITE_CCNTLV
if (prefix->suite == CCNL_SUITE_CCNTLV)
len += sprintf(str+len,"/%.*s",prefix->complen[i]-4,prefix->comp[i]+4);
else
#endif
len += sprintf(str+len,"/%.*s",prefix->complen[i],prefix->comp[i]);
}
DEBUGMSG(DEBUG, "expr is <%s>\n", str);
//search for result here... if found return...
if (thunk_request)
num_of_required_thunks = ccnl_nfn_count_required_thunks(str);
++ccnl->km->numOfRunningComputations;
restart:
res = Krivine_reduction(ccnl, str, thunk_request, start_locally,
num_of_required_thunks, &config, prefix, suite);
//stores result if computed
if (res) {
struct ccnl_prefix_s *copy;
struct ccnl_content_s *c;
DEBUGMSG(INFO,"Computation finished: res: %.*s size: %d bytes. Running computations: %d\n",
res->datalen, res->data, res->datalen, ccnl->km->numOfRunningComputations);
if (config && config->fox_state->thunk_request) {
// ccnl_nfn_remove_thunk_from_prefix(config->prefix);
ccnl_nfnprefix_clear(config->prefix, CCNL_PREFIX_THUNK);
}
copy = ccnl_prefix_dup(config->prefix);
c = ccnl_nfn_result2content(ccnl, ©, res->data, res->datalen);
c->flags = CCNL_CONTENT_FLAGS_STATIC;
set_propagate_of_interests_to_1(ccnl, c->name);
ccnl_content_serve_pending(ccnl,c);
ccnl_content_add2cache(ccnl, c);
--ccnl->km->numOfRunningComputations;
DBL_LINKED_LIST_REMOVE(ccnl->km->configuration_list, config);
ccnl_nfn_freeConfiguration(config);
ccnl_free(res);
}
#ifdef USE_NACK
else if(config->local_done){
struct ccnl_content_s *nack;
nack = ccnl_nfn_result2content(ccnl, &config->prefix,
(unsigned char*)":NACK", 5);
ccnl_content_serve_pending(ccnl, nack);
}
#endif
return 0;
}
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;
}
void
ccnl_do_ageing(void *ptr, void *dummy)
{
struct ccnl_relay_s *relay = (struct ccnl_relay_s*) ptr;
struct ccnl_content_s *c = relay->contents;
struct ccnl_interest_s *i = relay->pit;
struct ccnl_face_s *f = relay->faces;
time_t t = CCNL_NOW();
char *bufp = NULL;
DEBUGMSG_CORE(INFO, " ICNIoT: ageing t=%d\n", (int)t);
while (c) {
if ((c->last_used + CCNL_CONTENT_TIMEOUT) <= t &&
!(c->flags & CCNL_CONTENT_FLAGS_STATIC)){
DEBUGMSG_CORE(INFO, " ICNIoT: AGING: CONTENT REMOVE %p\n", (void*) c);
c = ccnl_content_remove(relay, c);
}
else{
//akhila 29-10-2015
// check if it is the n th time instant. If yes then save the content store
if ((((int)t)%CS_SAVE_PERIOD == 0) && !(c->flags & CCNL_CONTENT_FLAGS_STATIC)){
bufp = ccnl_prefix_to_path((c->pkt)->pfx);
DEBUGMSG_CORE(INFO, " ICNIoT: ContentStoreItem :%s\n",bufp);
ccnl_free(bufp);
}
c = c->next;
}
}
if (((int)t)%CS_SAVE_PERIOD == 0){
DEBUGMSG_CORE(INFO, " ICNIoT: ContentStoreItem contentCount:%d\n",relay->contentcnt);
}
while (i) { // CONFORM: "Entries in the PIT MUST timeout rather
// than being held indefinitely."
if ((i->last_used + CCNL_INTEREST_TIMEOUT) <= t){ // if it has timed out either resend it or remove it based on MAX_RETRIES
if(i->retries >= CCNL_MAX_INTEREST_RETRANSMIT){
DEBUGMSG_CORE(INFO, " ICNIoT: AGING: INTEREST REMOVE %p\n", (void*) i);
// DEBUGMSG_CORE(DEBUG, " timeout: remove interest 0x%p <%s>\n",(void*)i,ccnl_prefix_to_path(i->pkt->pfx));
i = ccnl_nfn_interest_remove(relay, i);
}
else {
// CONFORM: "A node MUST retransmit Interest Messages
// periodically for pending PIT entries."
DEBUGMSG_CORE(INFO, " ICNIoT: retransmit %d \n", i->retries);
// ccnl_prefix_to_path(i->pkt->pfx));
#ifdef USE_NFN
if (i->flags & CCNL_PIT_COREPROPAGATES){
#endif
DEBUGMSG_CORE(INFO, " ICNIoT: AGING: PROPAGATING INTEREST %p\n", (void*) i);
ccnl_interest_propagate(relay, i);
#ifdef USE_NFN
}
#endif
i->retries++;
i = i->next;
}
}
else{ // The interest has not timed out yet, so leave it alone !
// DEBUGMSG_CORE(INFO, " ICNIoT: AGING: DO NOTHING %p\n", (void*) i);
i = i->next;
}
}
// DEBUGMSG_CORE(INFO, " ICNIoT: PITcount %d\n",relay->pitcnt);
while (f) {
if (!(f->flags & CCNL_FACE_FLAGS_STATIC) &&
(f->last_used + CCNL_FACE_TIMEOUT) <= t){
DEBUGMSG_CORE(TRACE, "AGING: FACE REMOVE %p\n", (void*) f);
f = ccnl_face_remove(relay, f);
}
else
f = f->next;
}
}
int ccnl_core_RX_i_or_c(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(1, "ccnl_core_RX_i_or_c: (%d bytes left)\n", *datalen);
buf = ccnl_extract_prefix_nonce_ppkd(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(1, "ccnl_core_RX_i_or_c: interest=<%s>\n", ccnl_prefix_to_path(p));
from->stat.received_interest++;
if (p->compcnt > 0 && p->comp[0][0] == (unsigned char) 0xc1) {
goto Skip;
}
if (p->compcnt == 4 && !memcmp(p->comp[0], "ccnx", 4)) {
DEBUGMSG(1, "it's a mgnt msg!\n");
rc = ccnl_mgmt(relay, buf, p, from);
DEBUGMSG(1, "mgnt processing done!\n");
goto Done;
}
// CONFORM: Step 1:
if (aok & 0x01) { // honor "answer-from-existing-content-store" flag
for (c = relay->contents; c; c = c->next) {
if (!ccnl_i_prefixof_c(p, ppkd, minsfx, maxsfx, c)) {
continue;
}
// FIXME: should check stale bit in aok here
DEBUGMSG(7, " matching content for interest, content %p\n",
(void *) c);
from->stat.send_content[c->served_cnt % CCNL_MAX_CONTENT_SERVED_STAT]++;
c->served_cnt++;
if (from->ifndx >= 0) {
ccnl_face_enqueue(relay, from, buf_dup(c->pkt));
}
goto Skip;
}
}
// CONFORM: Step 2: check whether interest is already known
for (i = relay->pit; i; i = i->next) {
if (!ccnl_prefix_cmp(i->prefix, NULL, p, CMP_EXACT)
&& i->minsuffix == minsfx && i->maxsuffix == maxsfx
&& ((!ppkd && !i->ppkd) || buf_equal(ppkd, i->ppkd))) {
break;
}
}
if (!i) { // this is a new/unknown I request: create and propagate
i = ccnl_interest_new(relay, from, &buf, &p, minsfx, maxsfx, &ppkd);
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));
from->stat.received_content++;
// CONFORM: Step 1:
for (c = relay->contents; c; c = c->next) {
if (buf_equal(c->pkt, buf)) {
DEBUGMSG(1, "content is dup: skip\n");
goto Skip;
}
}
c = ccnl_content_new(relay, &buf, &p, &ppkd, content, contlen);
if (c) { // CONFORM: Step 2 (and 3)
if (!ccnl_content_serve_pending(relay, c, from)) { // unsolicited content
// CONFORM: "A node MUST NOT forward unsolicited data [...]"
DEBUGMSG(7, " removed because no matching interest\n");
free_content(c);
goto Skip;
}
#if CCNL_DYNAMIC_FIB
else {
/* content has matched an interest, we consider this name as available on this face */
ccnl_content_learn_name_route(relay, c->name, from, relay->fib_threshold_prefix, 0);
}
#endif
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);
DEBUGMSG(1, "leaving\n");
return rc;
}
char*
ZAM_fox(struct ccnl_relay_s *ccnl, struct configuration_s *config,
int *restart, int *halt, char *prog, char *arg, char *contd)
{
int local_search = 0, i;
int parameter_number = 0;
struct ccnl_content_s *c = NULL;
struct ccnl_prefix_s *pref;
struct ccnl_interest_s *interest;
DEBUGMSG(DEBUG, "---to do: FOX <%s>\n", arg);
ccnl_free(arg);
if (*restart) {
*restart = 0;
local_search = 1;
goto recontinue;
}
{
struct stack_s *h;
h = pop_or_resolve_from_result_stack(ccnl, config);
assert(h);
//TODO CHECK IF INT
config->fox_state->num_of_params = *(int*)h->content;
h->next = NULL;
ccnl_nfn_freeStack(h);
}
DEBUGMSG(DEBUG, "NUM OF PARAMS: %d\n", config->fox_state->num_of_params);
config->fox_state->params = ccnl_malloc(sizeof(struct ccnl_stack_s *) *
config->fox_state->num_of_params);
for (i = 0; i < config->fox_state->num_of_params; ++i) {
//pop parameter from stack
config->fox_state->params[i] = pop_from_stack(&config->result_stack);
switch (config->fox_state->params[i]->type) {
case STACK_TYPE_INT:
DEBUGMSG(DEBUG, " info: Parameter %d %d\n", i,
*(int *)config->fox_state->params[i]->content);
break;
case STACK_TYPE_PREFIX:
DEBUGMSG(DEBUG, " info: Parameter %d %s\n", i,
ccnl_prefix_to_path((struct ccnl_prefix_s*)
config->fox_state->params[i]->content));
break;
default:
break;
}
}
//as long as there is a routable parameter: try to find a result
config->fox_state->it_routable_param = 0;
//check if last result is now available
recontinue: //loop by reentering after timeout of the interest...
if (local_search) {
DEBUGMSG(DEBUG, "Checking if result was received\n");
parameter_number = choose_parameter(config);
pref = create_namecomps(ccnl, config, parameter_number,
config->fox_state->params[parameter_number]->content);
// search for a result
c = ccnl_nfn_local_content_search(ccnl, config, pref);
set_propagate_of_interests_to_1(ccnl, pref);
free_prefix(pref);
//TODO Check? //TODO remove interest here?
if (c) {
DEBUGMSG(DEBUG, "Result was found\n");
DEBUGMSG_CFWD(INFO, "data after result was found %.*s\n", c->pkt->contlen, c->pkt->content);
goto handlecontent;
}
}
//result was not delivered --> choose next parameter
++config->fox_state->it_routable_param;
parameter_number = choose_parameter(config);
if (parameter_number < 0)
//no more parameter --> no result found, can try a local computation
goto local_compute;
// create new prefix with name components!!!!
pref = create_namecomps(ccnl, config, parameter_number,
config->fox_state->params[parameter_number]->content);
c = ccnl_nfn_local_content_search(ccnl, config, pref);
if (c) {
free_prefix(pref);
goto handlecontent;
}
// Result not in cache, search over the network
// pref2 = ccnl_prefix_dup(pref);
interest = ccnl_nfn_query2interest(ccnl, &pref, config);
if (pref)
free_prefix(pref);
if (interest) {
ccnl_interest_propagate(ccnl, interest);
DEBUGMSG(DEBUG, " new interest's face is %d\n", interest->from->faceid);
}
// wait for content, return current program to continue later
*halt = -1; //set halt to -1 for async computations
return ccnl_strdup(prog);
local_compute:
if (config->local_done)
return NULL;
config->local_done = 1;
pref = ccnl_nfnprefix_mkComputePrefix(config, config->suite);
DEBUGMSG(DEBUG, "Prefix local computation: %s\n",
ccnl_prefix_to_path(pref));
interest = ccnl_nfn_query2interest(ccnl, &pref, config);
if (pref)
free_prefix(pref);
if (interest)
ccnl_interest_propagate(ccnl, interest);
handlecontent: //if result was found ---> handle it
if (c) {
#ifdef USE_NACK
if (!strncmp((char*)c->pkt->content, ":NACK", 5)) {
DEBUGMSG(DEBUG, "NACK RECEIVED, going to next parameter\n");
++config->fox_state->it_routable_param;
return prog ? ccnl_strdup(prog) : NULL;
}
#endif
int isANumber = 1, i = 0;
for(i = 0; i < c->pkt->contlen; ++i){
if(!isdigit(c->pkt->content[i])){
isANumber = 0;
break;
}
}
if (isANumber){
int *integer = ccnl_malloc(sizeof(int));
*integer = strtol((char*)c->pkt->content, 0, 0);
push_to_stack(&config->result_stack, integer, STACK_TYPE_INT);
} else {
struct prefix_mapping_s *mapping;
struct ccnl_prefix_s *name =
create_prefix_for_content_on_result_stack(ccnl, config);
push_to_stack(&config->result_stack, name, STACK_TYPE_PREFIX);
mapping = ccnl_malloc(sizeof(struct prefix_mapping_s));
mapping->key = ccnl_prefix_dup(name); //TODO COPY
mapping->value = ccnl_prefix_dup(c->pkt->pfx);
DBL_LINKED_LIST_ADD(config->fox_state->prefix_mapping, mapping);
DEBUGMSG(DEBUG, "Created a mapping %s - %s\n",
ccnl_prefix_to_path(mapping->key),
ccnl_prefix_to_path(mapping->value));
}
}
DEBUGMSG(DEBUG, " FOX continuation: %s\n", contd);
return ccnl_strdup(contd);
}
