+++ /dev/null
-/*
- This file is part of GNUnet
- (C) 2004, 2006, 2009 Christian Grothoff (and other contributing authors)
-
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, or (at your
- option) any later version.
-
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
- */
-/**
- * @file fragmentation/fragmentation.c
- * @brief fragmentation and defragmentation, this code allows
- * sending and receiving messages that are larger than
- * the MTU of the transport. Messages are still limited
- * to a maximum size of 65535 bytes, which is a good
- * idea because otherwise we may need ungainly fragmentation
- * buffers. Each connected peer can have at most one
- * fragmented packet at any given point in time (prevents
- * DoS attacks). Fragmented messages that have not been
- * completed after a certain amount of time are discarded.
- * @author Ji Lu
- */
-
-#include "platform.h"
-#include "gnunet_fragmentation_lib.h"
-#include "gnunet_protocols.h"
-#include "gnunet_util_lib.h"
-
-/**
- * Message fragment. This header is followed
- * by the actual data of the fragment.
- */
-
-struct Fragment
-{
-
- struct GNUNET_MessageHeader header;
-
- /**
- * Fragment offset.
- */
- uint16_t off GNUNET_PACKED;
-
- /**
- * "unique" id for the fragment
- */
- uint32_t id GNUNET_PACKED;
- uint16_t mtu;
- uint16_t totalNum;
- uint16_t totalSize;
-
-};
-
-struct GNUNET_FRAGEMENT_Ctxbuffer{
- struct GNUNET_FRAGEMENT_Ctxbuffer *next;
- uint32_t id;
- uint16_t size;
- char * buff;
- int counter;
- struct GNUNET_TIME_Absolute receivedTime;
- struct GNUNET_PeerIdentity peerID;
- int * num;
-};
-
-
-/**
- * Defragmentation context.
- */
-struct GNUNET_FRAGMENT_Context
-{
- uint32_t maxNum;
- struct GNUNET_FRAGEMENT_Ctxbuffer *buffer;
- GNUNET_FRAGMENT_MessageProcessor proc;
- void *proc_cls;
-};
-
-
-/**
- * Fragment an over-sized message.
- *
- * @param msg the message to fragment
- * @param mtu the maximum message size
- * @param proc function to call for each fragment
- * @param proc_cls closure for proc
- */
-void
-GNUNET_FRAGMENT_fragment (const struct GNUNET_MessageHeader *msg,
- uint16_t mtu,
- GNUNET_FRAGMENT_MessageProcessor proc,
- void *proc_cls)
-{
- uint32_t id = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 256);
- size_t size = sizeof(struct Fragment);
-
- if(ntohs(msg->size) > mtu-size){
- uint16_t lastSize;
- uint16_t num;
- uint16_t i;
- uint16_t actualNum;
- lastSize = ntohs(msg->size) % (mtu-size);
- num = ntohs(msg->size) / (mtu - size);
- actualNum = num;
- if(lastSize!=0){
- actualNum = num+1;
- }
- for(i = 0; i<actualNum; i++)
- {
- struct Fragment *frag;
- if(actualNum != num){
- if(i!=actualNum-1){
- frag = (struct Fragment *)GNUNET_malloc(mtu);
- }
- else{
- frag = (struct Fragment *)GNUNET_malloc(lastSize+size);
- }
- }
- else{
- frag = (struct Fragment *)GNUNET_malloc(mtu);
- }
- frag->header.type = htons(GNUNET_MESSAGE_TYPE_FRAGMENT);
- frag->id = htonl(id);
- frag->off = htons((mtu-size)*i);
- frag->mtu = htons(mtu);
- frag->totalNum = htons(actualNum);
- frag->totalSize = msg->size;
- char *tmpMsg = (char *)msg;
- if(actualNum != num){
- if(i!=actualNum-1){
- frag->header.size = htons(mtu);
- memcpy(&frag[1], tmpMsg + (mtu-size)*i, mtu - size);
- }
- else{
- frag->header.size = htons(lastSize+size);
- memcpy(&frag[1], tmpMsg + (mtu-size)*i, lastSize);
- }
- }
- else{
- frag->header.size = htons(mtu);
- memcpy(&frag[1], tmpMsg + (mtu-size)*i, mtu - size);
- }
- proc(proc_cls, &frag->header);
- GNUNET_free(frag);
- }
- }
-}
-
-/**
- * Create a defragmentation context.
- *
- * @param stats statistics context
- * @param proc function to call with defragmented messages
- * @param proc_cls closure for proc
- * @return the defragmentation context
- */
-struct GNUNET_FRAGMENT_Context *
-GNUNET_FRAGMENT_context_create (struct GNUNET_STATISTICS_Handle *stats,
- GNUNET_FRAGMENT_MessageProcessor proc,
- void *proc_cls)
- {
- struct GNUNET_FRAGMENT_Context *ctx = (struct GNUNET_FRAGMENT_Context*)GNUNET_malloc(sizeof(struct GNUNET_FRAGMENT_Context));
- ctx->maxNum = 100;
- ctx->proc = proc;
- ctx->proc_cls = proc_cls;
- ctx->buffer = NULL;
- return ctx;
- }
-
-
-/**
- * Destroy the given defragmentation context.
- */
-void
-GNUNET_FRAGMENT_context_destroy (struct GNUNET_FRAGMENT_Context *ctx)
-{
- struct GNUNET_FRAGEMENT_Ctxbuffer *buffer;
- struct GNUNET_FRAGEMENT_Ctxbuffer *temp;
- buffer = ctx->buffer;
-
- while (buffer != NULL)
- {
- temp = buffer->next;
- GNUNET_free(buffer->num);
- GNUNET_free(buffer);
- buffer = temp;
- }
- GNUNET_free(ctx);
- GNUNET_assert (0);
-}
-
-
-/**
- * We have received a fragment. Process it.
- *
- * @param ctx the context
- * @param sender who transmitted the fragment
- * @param msg the message that was received
- */
-void
-GNUNET_FRAGMENT_process (struct GNUNET_FRAGMENT_Context *ctx,
- const struct GNUNET_PeerIdentity *sender,
- const struct GNUNET_MessageHeader *msg)
-{
- uint16_t type = ntohs(msg->type);
- int exist = 0, received = 0;
- if(type!=GNUNET_MESSAGE_TYPE_FRAGMENT){
- return;
- }
- struct Fragment *frag = (struct Fragment *)msg;
- struct GNUNET_FRAGEMENT_Ctxbuffer* buffer;
- struct GNUNET_FRAGEMENT_Ctxbuffer* prev;
- prev = NULL;
- buffer = ctx->buffer;
- while (buffer != NULL)
- {
- if ((buffer->id == ntohl(frag->id))&&(0 == memcmp (&buffer->peerID,
- sender, sizeof (struct GNUNET_PeerIdentity)))){
- exist = 1;
- break;
- }
- prev = buffer;
- buffer = buffer->next;
- }
-
- if (exist)
- {
- int i;
- for(i = 0; i<ntohs(frag->totalNum); i++){
- if(buffer->num[i]==ntohs(frag->off)/(ntohs(frag->mtu)-sizeof(struct Fragment))){
- received = 1;
- break;
- }
- }
- }
-
- if(!exist){
- buffer = GNUNET_malloc(sizeof(struct GNUNET_FRAGEMENT_Ctxbuffer));
- buffer->num = GNUNET_malloc(ntohs(frag->totalNum)*sizeof(int));
- int j;
- for(j = 0; j<ntohs(frag->totalNum); j++){
- buffer->num[j] = -10;
- }
- buffer->peerID = *sender;
- buffer->id = ntohl(frag->id);
- buffer->receivedTime = GNUNET_TIME_absolute_get ();
- uint16_t si = ntohs(frag->totalSize);
- buffer->size = si;
- buffer->buff = GNUNET_malloc(si);
- buffer->next = ctx->buffer;
- ctx->buffer = buffer;
- }
-
- if(!received){
- buffer->num[buffer->counter++]=ntohs(frag->off)/(ntohs(frag->mtu)-sizeof(struct Fragment));
- uint16_t sizeoffrag = ntohs(frag->header.size) - sizeof(struct Fragment);
- memcpy(&buffer->buff[ntohs(frag->off)], &frag[1], sizeoffrag);
- buffer->receivedTime = GNUNET_TIME_absolute_get ();
- }
-
- if(buffer->counter == ntohs(frag->totalNum))
- {
- ctx->proc(ctx->proc_cls, (struct GNUNET_MessageHeader *)buffer->buff);
- if(prev==NULL){
- ctx->buffer = buffer->next;
- }
- else{
- prev->next = buffer->next;
- }
- GNUNET_free(buffer);
- return;
- }
-}
-
-
-
-#if 0
-
-/**
- * How many buckets does the fragment hash table
- * have?
- */
-#define DEFRAG_BUCKET_COUNT 16
-
-/**
- * After how long do fragments time out?
- */
-#ifndef DEFRAGMENTATION_TIMEOUT
-#define DEFRAGMENTATION_TIMEOUT (3 * GNUNET_CRON_MINUTES)
-#endif
-
-/**
- * Entry in the linked list of fragments.
- */
-typedef struct FL
-{
- struct FL *link;
- P2P_fragmentation_MESSAGE *frag;
-} FL;
-
-/**
- * Entry in the GNUNET_hash table of fragments.
- */
-typedef struct FC
-{
- struct FC *next;
- FL *head;
- GNUNET_PeerIdentity sender;
- int id;
- GNUNET_CronTime ttl;
-} FC;
-
-#define FRAGSIZE(fl) ((ntohs(fl->frag->header.size)-sizeof(P2P_fragmentation_MESSAGE)))
-
-static GNUNET_CoreAPIForPlugins *coreAPI;
-
-static GNUNET_Stats_ServiceAPI *stats;
-
-static int stat_defragmented;
-
-static int stat_fragmented;
-
-static int stat_discarded;
-
-/**
- * Hashtable *with* collision management!
- */
-static struct FC *defragmentationCache[DEFRAG_BUCKET_COUNT];
-
-/**
- * Lock for the defragmentation cache.
- */
-static struct GNUNET_Mutex *defragCacheLock;
-
-static void
-freeFL (FL * fl, int c)
-{
- while (fl != NULL)
- {
- FL *link = fl->link;
- if (stats != NULL)
- stats->change (stat_discarded, c);
- GNUNET_free (fl->frag);
- GNUNET_free (fl);
- fl = link;
- }
-}
-
-/**
- * This cron job ensures that we purge buffers of fragments
- * that have timed out. It can run in much longer intervals
- * than the defragmentationCron, e.g. every 60s.
- * <p>
- * This method goes through the hashtable, finds entries that
- * have timed out and removes them (and all the fragments that
- * belong to the entry). It's a bit more complicated as the
- * collision list is also collapsed.
- */
-static void
-defragmentationPurgeCron (void *unused)
-{
- int i;
- FC *smf;
- FC *next;
- FC *last;
-
- GNUNET_mutex_lock (defragCacheLock);
- for (i = 0; i < DEFRAG_BUCKET_COUNT; i++)
- {
- last = NULL;
- smf = defragmentationCache[i];
- while (smf != NULL)
- {
- if (smf->ttl < GNUNET_get_time ())
- {
- /* free linked list of fragments */
- freeFL (smf->head, 1);
- next = smf->next;
- GNUNET_free (smf);
- if (last == NULL)
- defragmentationCache[i] = next;
- else
- last->next = next;
- smf = next;
- }
- else
- {
- last = smf;
- smf = smf->next;
- }
- } /* while smf != NULL */
- } /* for all buckets */
- GNUNET_mutex_unlock (defragCacheLock);
-}
-
-/**
- * Check if this fragment-list is complete. If yes, put it together,
- * process and free all buffers. Does not free the pep
- * itself (but sets the TTL to 0 to have the cron free it
- * in the next iteration).
- *
- * @param pep the entry in the GNUNET_hash table
- */
-static void
-checkComplete (FC * pep)
-{
- FL *pos;
- unsigned short off;
- unsigned short len;
- char *msg;
-
- GNUNET_GE_ASSERT (NULL, pep != NULL);
- pos = pep->head;
- if (pos == NULL)
- return;
- len = ntohs (pos->frag->len);
- if (len == 0)
- goto CLEANUP; /* really bad error! */
- off = 0;
- while ((pos != NULL) && (ntohs (pos->frag->off) <= off))
- {
- if (off >= off + FRAGSIZE (pos))
- goto CLEANUP; /* error! */
- if (ntohs (pos->frag->off) + FRAGSIZE (pos) > off)
- off = ntohs (pos->frag->off) + FRAGSIZE (pos);
- else
- goto CLEANUP; /* error! */
- pos = pos->link;
- }
- if (off < len)
- return; /* some fragment is still missing */
-
- msg = GNUNET_malloc (len);
- pos = pep->head;
- while (pos != NULL)
- {
- memcpy (&msg[ntohs (pos->frag->off)], &pos->frag[1], FRAGSIZE (pos));
- pos = pos->link;
- }
- if (stats != NULL)
- stats->change (stat_defragmented, 1);
-#if 0
- printf ("Finished defragmentation!\n");
-#endif
- /* handle message! */
- coreAPI->loopback_send (&pep->sender, msg, len, GNUNET_YES, NULL);
- GNUNET_free (msg);
- CLEANUP:
- /* free fragment buffers */
- freeFL (pep->head, 0);
- pep->head = NULL;
- pep->ttl = 0;
-}
-
-/**
- * See if the new fragment is a part of this entry and join them if
- * yes. Return GNUNET_SYSERR if the fragments do not match. Return GNUNET_OK if
- * the fragments do match and the fragment has been processed. The
- * defragCacheLock is already acquired by the caller whenever this
- * method is called.<p>
- *
- * @param entry the entry in the cache
- * @param pep the new entry
- * @param packet the ip part in the new entry
- */
-static int
-tryJoin (FC * entry,
- const GNUNET_PeerIdentity * sender,
- const P2P_fragmentation_MESSAGE * packet)
-{
- /* frame before ours; may end in the middle of
- our frame or before it starts; NULL if we are
- the earliest position we have received so far */
- FL *before;
- /* frame after ours; may start in the middle of
- our frame or after it; NULL if we are the last
- fragment we have received so far */
- FL *after;
- /* current position in the frame-list */
- FL *pos;
- /* the new entry that we're inserting */
- FL *pep;
- FL *tmp;
- unsigned short end;
-
- GNUNET_GE_ASSERT (NULL, entry != NULL);
- if (0 != memcmp (sender, &entry->sender, sizeof (GNUNET_PeerIdentity)))
- return GNUNET_SYSERR; /* wrong fragment list, try another! */
- if (ntohl (packet->id) != entry->id)
- return GNUNET_SYSERR; /* wrong fragment list, try another! */
-#if 0
- printf ("Received fragment %u from %u to %u\n",
- ntohl (packet->id),
- ntohs (packet->off),
- ntohs (packet->off) + ntohs (packet->header.size) -
- sizeof (P2P_fragmentation_MESSAGE));
-#endif
- pos = entry->head;
- if ((pos != NULL) && (packet->len != pos->frag->len))
- return GNUNET_SYSERR; /* wrong fragment size */
-
- before = NULL;
- /* find the before-frame */
- while ((pos != NULL) && (ntohs (pos->frag->off) < ntohs (packet->off)))
- {
- before = pos;
- pos = pos->link;
- }
-
- /* find the after-frame */
- end =
- ntohs (packet->off) + ntohs (packet->header.size) -
- sizeof (P2P_fragmentation_MESSAGE);
- if (end <= ntohs (packet->off))
- {
- GNUNET_GE_LOG (NULL,
- GNUNET_GE_DEVELOPER | GNUNET_GE_DEBUG | GNUNET_GE_BULK,
- "Received invalid fragment at %s:%d\n", __FILE__,
- __LINE__);
- return GNUNET_SYSERR; /* yuck! integer overflow! */
- }
-
- if (before != NULL)
- after = before;
- else
- after = entry->head;
- while ((after != NULL) && (ntohs (after->frag->off) < end))
- after = after->link;
-
- if ((before != NULL) && (before == after))
- {
- /* this implies after or before != NULL and thereby the new
- fragment is redundant as it is fully enclosed in an earlier
- fragment */
- if (stats != NULL)
- stats->change (stat_defragmented, 1);
- return GNUNET_OK; /* drop, there is a packet that spans our range! */
- }
-
- if ((before != NULL) &&
- (after != NULL) &&
- ((htons (before->frag->off) +
- FRAGSIZE (before)) >= htons (after->frag->off)))
- {
- /* this implies that the fragment that starts before us and the
- fragment that comes after this one leave no space in the middle
- or even overlap; thus we can drop this redundant piece */
- if (stats != NULL)
- stats->change (stat_defragmented, 1);
- return GNUNET_OK;
- }
-
- /* allocate pep */
- pep = GNUNET_malloc (sizeof (FC));
- pep->frag = GNUNET_malloc (ntohs (packet->header.size));
- memcpy (pep->frag, packet, ntohs (packet->header.size));
- pep->link = NULL;
-
- if (before == NULL)
- {
- pep->link = after;
- pos = entry->head;
- while (pos != after)
- {
- tmp = pos->link;
- GNUNET_free (pos->frag);
- GNUNET_free (pos);
- pos = tmp;
- }
- entry->head = pep;
- goto FINISH;
- /* end of insert first */
- }
-
- if (after == NULL)
- {
- /* insert last: find the end, free everything after it */
- freeFL (before->link, 1);
- before->link = pep;
- goto FINISH;
- }
-
- /* ok, we are filling the middle between two fragments; insert. If
- there is anything else in the middle, it can be dropped as we're
- bigger & cover that area as well */
- /* free everything between before and after */
- pos = before->link;
- while (pos != after)
- {
- tmp = pos->link;
- GNUNET_free (pos->frag);
- GNUNET_free (pos);
- pos = tmp;
- }
- before->link = pep;
- pep->link = after;
-
- FINISH:
- entry->ttl = GNUNET_get_time () + DEFRAGMENTATION_TIMEOUT;
- checkComplete (entry);
- return GNUNET_OK;
-}
-
-/**
- * Defragment the given fragment and pass to handler once
- * defragmentation is complete.
- *
- * @param frag the packet to defragment
- * @return GNUNET_SYSERR if the fragment is invalid
- */
-static int
-processFragment (const GNUNET_PeerIdentity * sender,
- const GNUNET_MessageHeader * frag)
-{
- unsigned int hash;
- FC *smf;
-
- if (ntohs (frag->size) < sizeof (P2P_fragmentation_MESSAGE))
- return GNUNET_SYSERR;
-
- GNUNET_mutex_lock (defragCacheLock);
- hash = sender->hashPubKey.bits[0] % DEFRAG_BUCKET_COUNT;
- smf = defragmentationCache[hash];
- while (smf != NULL)
- {
- if (GNUNET_OK ==
- tryJoin (smf, sender, (P2P_fragmentation_MESSAGE *) frag))
- {
- GNUNET_mutex_unlock (defragCacheLock);
- return GNUNET_OK;
- }
- if (0 == memcmp (sender, &smf->sender, sizeof (GNUNET_PeerIdentity)))
- {
- freeFL (smf->head, 1);
- break;
- }
- smf = smf->next;
- }
- if (smf == NULL)
- {
- smf = GNUNET_malloc (sizeof (FC));
- smf->next = defragmentationCache[hash];
- defragmentationCache[hash] = smf;
- smf->ttl = GNUNET_get_time () + DEFRAGMENTATION_TIMEOUT;
- smf->sender = *sender;
- }
- smf->id = ntohl (((P2P_fragmentation_MESSAGE *) frag)->id);
- smf->head = GNUNET_malloc (sizeof (FL));
- smf->head->link = NULL;
- smf->head->frag = GNUNET_malloc (ntohs (frag->size));
- memcpy (smf->head->frag, frag, ntohs (frag->size));
-
- GNUNET_mutex_unlock (defragCacheLock);
- return GNUNET_OK;
-}
-
-typedef struct
-{
- GNUNET_PeerIdentity sender;
- /* maximums size of each fragment */
- unsigned short mtu;
- /** how long is this message part expected to be? */
- unsigned short len;
- /** when did we intend to transmit? */
- GNUNET_CronTime transmissionTime;
-} FragmentBMC;
-
-/**
- * Send a message that had to be fragmented (right now!). First grabs
- * the first part of the message (obtained from ctx->se) and stores
- * that in a P2P_fragmentation_MESSAGE envelope. The remaining fragments are
- * added to the send queue with GNUNET_EXTREME_PRIORITY (to ensure that they
- * will be transmitted next). The logic here is that if the priority
- * for the first fragment was sufficiently high, the priority should
- * also have been sufficiently high for all of the other fragments (at
- * this time) since they have the same priority. And we want to make
- * sure that we send all of them since just sending the first fragment
- * and then going to other messages of equal priority would not be
- * such a great idea (i.e. would just waste bandwidth).
- */
-static int
-fragmentBMC (void *buf, void *cls, unsigned short len)
-{
- FragmentBMC *ctx = cls;
- static int idGen = 0;
- P2P_fragmentation_MESSAGE *frag;
- unsigned int pos;
- int id;
- unsigned short mlen;
-
- if ((len < ctx->mtu) || (buf == NULL))
- {
- GNUNET_free (ctx);
- return GNUNET_SYSERR;
- }
- if (stats != NULL)
- stats->change (stat_fragmented, 1);
- id = (idGen++) + GNUNET_random_u32 (GNUNET_RANDOM_QUALITY_WEAK, 512);
- /* write first fragment to buf */
- frag = (P2P_fragmentation_MESSAGE *) buf;
- frag->header.size = htons (len);
- frag->header.type = htons (GNUNET_P2P_PROTO_MESSAGE_FRAGMENT);
- frag->id = id;
- frag->off = htons (0);
- frag->len = htons (ctx->len);
- memcpy (&frag[1], &ctx[1], len - sizeof (P2P_fragmentation_MESSAGE));
-
- /* create remaining fragments, add to queue! */
- pos = len - sizeof (P2P_fragmentation_MESSAGE);
- frag = GNUNET_malloc (ctx->mtu);
- while (pos < ctx->len)
- {
- mlen = sizeof (P2P_fragmentation_MESSAGE) + ctx->len - pos;
- if (mlen > ctx->mtu)
- mlen = ctx->mtu;
- GNUNET_GE_ASSERT (NULL, mlen > sizeof (P2P_fragmentation_MESSAGE));
- frag->header.size = htons (mlen);
- frag->header.type = htons (GNUNET_P2P_PROTO_MESSAGE_FRAGMENT);
- frag->id = id;
- frag->off = htons (pos);
- frag->len = htons (ctx->len);
- memcpy (&frag[1],
- &((char *) (&ctx[1]))[pos],
- mlen - sizeof (P2P_fragmentation_MESSAGE));
- coreAPI->ciphertext_send (&ctx->sender,
- &frag->header,
- GNUNET_EXTREME_PRIORITY,
- ctx->transmissionTime - GNUNET_get_time ());
- pos += mlen - sizeof (P2P_fragmentation_MESSAGE);
- }
- GNUNET_GE_ASSERT (NULL, pos == ctx->len);
- GNUNET_free (frag);
- GNUNET_free (ctx);
- return GNUNET_OK;
-}
-
-/**
- * The given message must be fragmented. Produce a placeholder that
- * corresponds to the first fragment. Once that fragment is scheduled
- * for transmission, the placeholder should automatically add all of
- * the other fragments (with very high priority).
- */
-void
-fragment (const GNUNET_PeerIdentity * peer,
- unsigned int mtu,
- unsigned int prio,
- unsigned int targetTime,
- unsigned int len, GNUNET_BuildMessageCallback bmc, void *bmcClosure)
-{
- FragmentBMC *fbmc;
- int xlen;
-
- GNUNET_GE_ASSERT (NULL, len > mtu);
- GNUNET_GE_ASSERT (NULL, mtu > sizeof (P2P_fragmentation_MESSAGE));
- fbmc = GNUNET_malloc (sizeof (FragmentBMC) + len);
- fbmc->mtu = mtu;
- fbmc->sender = *peer;
- fbmc->transmissionTime = targetTime;
- fbmc->len = len;
- if (bmc == NULL)
- {
- memcpy (&fbmc[1], bmcClosure, len);
- GNUNET_free (bmcClosure);
- }
- else
- {
- if (GNUNET_SYSERR == bmc (&fbmc[1], bmcClosure, len))
- {
- GNUNET_free (fbmc);
- return;
- }
- }
- xlen = mtu - sizeof (P2P_fragmentation_MESSAGE);
- coreAPI->ciphertext_send_with_callback (peer, &fragmentBMC, fbmc, mtu, prio * xlen / len, /* compute new priority */
- targetTime);
-}
-
-/**
- * Initialize Fragmentation module.
- */
-GNUNET_Fragmentation_ServiceAPI *
-provide_module_fragmentation (GNUNET_CoreAPIForPlugins * capi)
-{
- static GNUNET_Fragmentation_ServiceAPI ret;
- int i;
-
- coreAPI = capi;
- stats = coreAPI->service_request ("stats");
- if (stats != NULL)
- {
- stat_defragmented =
- stats->create (gettext_noop ("# messages defragmented"));
- stat_fragmented =
- stats->create (gettext_noop ("# messages fragmented"));
- stat_discarded = stats->create (gettext_noop ("# fragments discarded"));
- }
- for (i = 0; i < DEFRAG_BUCKET_COUNT; i++)
- defragmentationCache[i] = NULL;
- defragCacheLock = GNUNET_mutex_create (GNUNET_NO);
- GNUNET_cron_add_job (coreAPI->cron,
- &defragmentationPurgeCron,
- 60 * GNUNET_CRON_SECONDS, 60 * GNUNET_CRON_SECONDS,
- NULL);
- GNUNET_GE_LOG (capi->ectx,
- GNUNET_GE_INFO | GNUNET_GE_USER | GNUNET_GE_REQUEST,
- _("`%s' registering handler %d\n"), "fragmentation",
- GNUNET_P2P_PROTO_MESSAGE_FRAGMENT);
- capi->p2p_ciphertext_handler_register (GNUNET_P2P_PROTO_MESSAGE_FRAGMENT,
- &processFragment);
-
- ret.fragment = &fragment;
- return &ret;
-}
-
-/**
- * Shutdown fragmentation.
- */
-void
-release_module_fragmentation ()
-{
- int i;
-
- coreAPI->p2p_ciphertext_handler_unregister
- (GNUNET_P2P_PROTO_MESSAGE_FRAGMENT, &processFragment);
- GNUNET_cron_del_job (coreAPI->cron, &defragmentationPurgeCron,
- 60 * GNUNET_CRON_SECONDS, NULL);
- for (i = 0; i < DEFRAG_BUCKET_COUNT; i++)
- {
- FC *pos = defragmentationCache[i];
- while (pos != NULL)
- {
- FC *next = pos->next;
- freeFL (pos->head, 1);
- GNUNET_free (pos);
- pos = next;
- }
- }
- if (stats != NULL)
- {
- coreAPI->service_release (stats);
- stats = NULL;
- }
- GNUNET_mutex_destroy (defragCacheLock);
- defragCacheLock = NULL;
- coreAPI = NULL;
-}
-
-#endif
-
-/* end of fragmentation.c */
projects / oweals / gnunet.git / commitdiff