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/*
* Copyright (c) 2017-20 David Lamparter, for NetDEF, Inc.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <pthread.h>
#include <signal.h>
#include <inttypes.h>
#include "xref.h"
#include "vty.h"
#include "jhash.h"
#include "sha256.h"
#include "memory.h"
#include "hash.h"
struct xref_block *xref_blocks;
static struct xref_block **xref_block_last = &xref_blocks;
static void base32(uint8_t **inpos, int *bitpos,
char *out, size_t n_chars)
{
static const char base32ch[] = "0123456789ABCDEFGHJKMNPQRSTVWXYZ";
char *opos = out;
uint8_t *in = *inpos;
int bp = *bitpos;
while (opos < out + n_chars) {
uint32_t bits = in[0] | (in[1] << 8);
if (bp == -1)
bits |= 0x10;
else
bits >>= bp;
*opos++ = base32ch[bits & 0x1f];
bp += 5;
if (bp >= 8)
in++, bp -= 8;
}
*opos = '\0';
*inpos = in;
*bitpos = bp;
}
static void xref_add_one(const struct xref *xref)
{
SHA256_CTX sha;
struct xrefdata *xrefdata;
const char *filename, *p, *q;
uint8_t hash[32], *h = hash;
uint32_t be_val;
int bitpos;
if (!xref || !xref->xrefdata)
return;
xrefdata = xref->xrefdata;
xrefdata->xref = xref;
if (!xrefdata->hashstr)
return;
/* as far as the unique ID is concerned, only use the last
* directory name + filename, e.g. "bgpd/bgp_route.c". This
* gives a little leeway in moving things and avoids IDs being
* screwed up by out of tree builds or absolute pathnames.
*/
filename = xref->file;
p = strrchr(filename, '/');
if (p) {
q = memrchr(filename, '/', p - filename);
if (q)
filename = q + 1;
else
filename = p + 1;
}
SHA256_Init(&sha);
SHA256_Update(&sha, filename, strlen(filename));
SHA256_Update(&sha, xrefdata->hashstr,
strlen(xrefdata->hashstr));
be_val = htonl(xrefdata->hashu32[0]);
SHA256_Update(&sha, &be_val, sizeof(be_val));
be_val = htonl(xrefdata->hashu32[1]);
SHA256_Update(&sha, &be_val, sizeof(be_val));
SHA256_Final(hash, &sha);
bitpos = -1;
base32(&h, &bitpos, &xrefdata->uid[0], 5);
xrefdata->uid[5] = '-';
base32(&h, &bitpos, &xrefdata->uid[6], 5);
}
void xref_gcc_workaround(const struct xref *xref)
{
xref_add_one(xref);
}
void xref_block_add(struct xref_block *block)
{
const struct xref * const *xrefp;
*xref_block_last = block;
xref_block_last = &block->next;
for (xrefp = block->start; xrefp < block->stop; xrefp++)
xref_add_one(*xrefp);
}
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