diff options
Diffstat (limited to 'lib/xref.c')
| -rw-r--r-- | lib/xref.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/lib/xref.c b/lib/xref.c new file mode 100644 index 0000000..0d3549d --- /dev/null +++ b/lib/xref.c @@ -0,0 +1,132 @@ +/* + * 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; + +struct xrefdata_uid_head xrefdata_uid = INIT_RBTREE_UNIQ(xrefdata_uid); + +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; + } + + 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); + + xrefdata_uid_add(&xrefdata_uid, xrefdata); +} + +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); +} |