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-rw-r--r--lib/xref.c132
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);
+}