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/*
* phn.c: implementation of the extension definition
* functions for the Previous Hop Node block.
*
* Copyright (c) 2009, California Institute of Technology.
* ALL RIGHTS RESERVED. U.S. Government Sponsorship
* acknowledged.
*
* Author: Scott Burleigh, JPL
*/
#include "bpP.h"
#include "bei.h"
#include "phn.h"
int phn_offer(ExtensionBlock *blk, Bundle *bundle)
{
blk->blkProcFlags = BLK_REMOVE_IF_NG;
blk->dataLength = 0; /* Will know length at dequeue. */
blk->length = 3; /* Just to keep block alive. */
blk->size = 0;
blk->object = 0;
return 0;
}
void phn_release(ExtensionBlock *blk)
{
return;
}
int phn_record(ExtensionBlock *sdrBlk, AcqExtBlock *ramBlk)
{
return 0;
}
int phn_copy(ExtensionBlock *newBlk, ExtensionBlock *oldBlk)
{
return 0;
}
int phn_processOnFwd(ExtensionBlock *blk, Bundle *bundle, void *ctxt)
{
return 0;
}
int phn_processOnAccept(ExtensionBlock *blk, Bundle *bundle, void *ctxt)
{
return 0;
}
int phn_processOnEnqueue(ExtensionBlock *blk, Bundle *bundle, void *ctxt)
{
return 0;
}
int phn_processOnDequeue(ExtensionBlock *blk, Bundle *bundle, void *ctxt)
{
DequeueContext *context = (DequeueContext *) ctxt;
MetaEid metaEid;
VScheme *vscheme;
PsmAddress vschemeElt;
int nameLength;
char *adminEid;
int result;
suppressExtensionBlock(blk); /* Default. */
/* To figure out which admin EID to use as the previous-
* hop node EID, look at the EID scheme of the proximate
* node EID; use the same scheme, since you know the
* receiver understands that scheme. */
result = parseEidString(context->proxNodeEid, &metaEid, &vscheme,
&vschemeElt);
restoreEidString(&metaEid);
if (result == 0)
{
/* Can't know which admin EID to use. */
return 0;
}
restoreExtensionBlock(blk);
nameLength = vscheme->nameLength + 1 + vscheme->adminNSSLength;
blk->dataLength = nameLength + 1;
adminEid = MTAKE(blk->dataLength);
if (adminEid == NULL)
{
putErrmsg("Can't construct phn text.", itoa(blk->dataLength));
return -1;
}
memcpy(adminEid, vscheme->adminEid, nameLength);
*(adminEid + nameLength) = '\0';
result = serializeExtBlk(blk, NULL, adminEid);
MRELEASE(adminEid);
return result;
}
static int getSenderEidFromDictionary(AcqExtBlock *blk, AcqWorkArea *wk)
{
LystElt elt;
EndpointId eid;
if (lyst_length(blk->eidReferences) != 2 || wk->dictionary == NULL)
{
return 0; /* Malformed. */
}
memset((char *) &eid, 0, sizeof(EndpointId));
elt = lyst_first(blk->eidReferences);
eid.d.schemeNameOffset = (unsigned long) lyst_data(elt);
elt = lyst_next(elt);
eid.d.nssOffset = (unsigned long) lyst_data(elt);
if (eid.d.schemeNameOffset > wk->bundle.dictionaryLength
|| eid.d.nssOffset > wk->bundle.dictionaryLength)
{
return 0; /* Malformed. */
}
if (printEid(&eid, wk->dictionary, &(wk->senderEid)) < 0)
{
putErrmsg("No space for sender EID.", NULL);
return -1;
}
return 1;
}
int phn_acquire(AcqExtBlock *blk, AcqWorkArea *wk)
{
char *lastByte;
int eidLen;
char *eid;
/* Data parsed out of the phn byte array go directly into
* the work area structure, not into a block-specific
* workspace object. */
blk->size = 0;
blk->object = NULL;
if (wk->senderEid) /* Provided another way. */
{
return 1; /* Ignore PHN block. */
}
if (blk->blkProcFlags & BLK_HAS_EID_REFERENCES)
{
return getSenderEidFromDictionary(blk, wk);
}
lastByte = ((char *) (blk->bytes)) + (blk->length - 1);
if (*lastByte != '\0') /* S/b null-terminated. */
{
return 0; /* Malformed. */
}
eid = ((char *) (blk->bytes)) + (blk->length - blk->dataLength);
eidLen = blk->dataLength;
wk->senderEid = MTAKE(eidLen);
if (wk->senderEid == NULL)
{
putErrmsg("No space for sender EID.", NULL);
return -1;
}
istrcpy(wk->senderEid, eid, eidLen);
return 1;
}
int phn_check(AcqExtBlock *blk, AcqWorkArea *wk)
{
discardExtensionBlock(blk);
return 0;
}
void phn_clear(AcqExtBlock *blk)
{
return;
}
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