/**
* Read block parameters. This detects if the block contains the
* individual log hashes, the intermediate hashes and the overall
* block paramters (from the signature block). As we do not have any
* begin of block record, we do not know e.g. the hash algorithm or IV
* until reading the block signature record. And because the file is
* purely sequential and variable size, we need to read all records up to
* the next signature record.
* If a caller intends to verify a log file based on the parameters,
* he must re-read the file from the begining (we could keep things
* in memory, but this is impractical for large blocks). In order
* to facitate this, the function permits to rewind to the original
* read location when it is done.
*
* @param[in] fp file pointer of tlv file
* @param[in] bRewind 0 - do not rewind at end of procesing, 1 - do so
* @param[out] bs block signature record
* @param[out] bHasRecHashes 0 if record hashes are present, 1 otherwise
* @param[out] bHasIntermedHashes 0 if intermediate hashes are present,
* 1 otherwise
*
* @returns 0 if ok, something else otherwise
*/
int
rsgt_getBlockParams(FILE *fp, uint8_t bRewind, block_sig_t **bs,
uint8_t *bHasRecHashes, uint8_t *bHasIntermedHashes)
{
int r;
uint64_t nRecs = 0;
uint8_t bDone = 0;
off_t rewindPos = 0;
void *obj;
tlvrecord_t rec;
if(bRewind)
rewindPos = ftello(fp);
*bHasRecHashes = 0;
*bHasIntermedHashes = 0;
*bs = NULL;
while(!bDone) { /* we will err out on EOF */
if((r = rsgt_tlvrd(fp, &rec, &obj)) != 0) goto done;
switch(rec.tlvtype) {
case 0x0900:
++nRecs;
*bHasRecHashes = 1;
break;
case 0x0901:
*bHasIntermedHashes = 1;
break;
case 0x0902:
*bs = (block_sig_t*) obj;
bDone = 1;
break;
default:fprintf(fp, "unknown tlv record %4.4x\n", rec.tlvtype);
break;
}
if(!bDone)
rsgt_objfree(rec.tlvtype, obj);
}
if(*bHasRecHashes && (nRecs != (*bs)->recCount)) {
r = RSGTE_INVLD_RECCNT;
goto done;
}
if(bRewind) {
if(fseeko(fp, rewindPos, SEEK_SET) != 0) {
r = RSGTE_IO;
goto done;
}
}
done:
return r;
}
/* read BLOCK_SIG during verification phase */
static int
rsgt_tlvrdVrfyBlockSig(FILE *fp, block_sig_t **bs, tlvrecord_t *rec)
{
int r;
if((r = rsgt_tlvrd(fp, rec, bs)) != 0) goto done;
if(rec->tlvtype != 0x0902) {
r = RSGTE_MISS_BLOCKSIG;
rsgt_objfree(rec->tlvtype, *bs);
goto done;
}
r = 0;
done: return r;
}
static int
rsgt_tlvrdTreeHash(FILE *fp, FILE *outfp, imprint_t **imp)
{
int r;
tlvrecord_t rec;
if((r = rsgt_tlvrd(fp, &rec, imp)) != 0) goto done;
if(rec.tlvtype != 0x0901) {
r = RSGTE_MISS_TREE_HASH;
rsgt_objfree(rec.tlvtype, *imp);
goto done;
}
if(outfp != NULL)
if((r = rsgt_tlvwrite(outfp, &rec)) != 0) goto done;
r = 0;
done: return r;
}
static void
dumpFile(char *name)
{
FILE *fp;
char hdr[9];
void *obj;
tlvrecord_t rec;
int r = -1;
if(!strcmp(name, "-"))
fp = stdin;
else {
printf("Processing file %s:\n", name);
if((fp = fopen(name, "r")) == NULL) {
perror(name);
goto err;
}
}
if((r = rsgt_tlvrdHeader(fp, (uchar*)hdr)) != 0) goto err;
if(!strcmp(hdr, "LOGSIG10"))
printf("File Header: Version 10 (deprecated) - conversion needed.\n");
else if(!strcmp(hdr, "LOGSIG11"))
printf("File Header: Version 11\n");
else
printf("File Header: '%s'\n", hdr);
while(1) { /* we will err out on EOF */
if((r = rsgt_tlvrd(fp, &rec, &obj)) != 0) {
if(feof(fp))
break;
else
goto err;
}
rsgt_tlvprint(stdout, rec.tlvtype, obj, verbose);
rsgt_objfree(rec.tlvtype, obj);
}
if(fp != stdin)
fclose(fp);
return;
err:
fprintf(stderr, "error %d (%s) processing file %s\n", r, RSGTE2String(r), name);
}
