/**
* @pre closure points to a valid isc_buffer
* @pre isc_buffer has non-NULL mctx
* @pre isc_buffer has NULL buffer OR a buffer allocated from mctx
*
* @post closure contains \0 terminated string which is concatenation
* of previous context and input text
*/
static void
buffer_append_str(void *closure, const char *text, int textlen) {
isc_buffer_t *out_buf = closure;
isc_region_t new_space;
isc_region_t old_space;
REQUIRE(ISC_BUFFER_VALID(out_buf));
REQUIRE(out_buf->mctx != NULL);
REQUIRE(text != NULL);
/* Allocate sufficiently long output buffer. */
isc_buffer_region(out_buf, &old_space);
new_space.length = isc_buffer_length(out_buf) + textlen + 1;
new_space.base = isc_mem_get(out_buf->mctx, new_space.length);
RUNTIME_CHECK(new_space.base != NULL);
isc_buffer_reinit(out_buf, new_space.base, new_space.length);
if (old_space.base != NULL)
isc_mem_put(out_buf->mctx, old_space.base, old_space.length);
/* Append output text and \0-terminate it.
* Overwrite \0 at the end if needed. */
if (isc_buffer_usedlength(out_buf) != 0)
/* Previous string is \0 terminated, chop \0. */
isc_buffer_subtract(out_buf, 1);
isc_buffer_putstr(out_buf, text);
isc_buffer_putuint8(out_buf, '\0');
}
/*
* Compares only the public portion of two keys, by converting them
* both to wire format and comparing the results.
*/
static isc_boolean_t
pub_compare(const dst_key_t *key1, const dst_key_t *key2) {
isc_result_t result;
unsigned char buf1[DST_KEY_MAXSIZE], buf2[DST_KEY_MAXSIZE];
isc_buffer_t b1, b2;
isc_region_t r1, r2;
isc_buffer_init(&b1, buf1, sizeof(buf1));
result = dst_key_todns(key1, &b1);
if (result != ISC_R_SUCCESS)
return (ISC_FALSE);
/* Zero out flags. */
buf1[0] = buf1[1] = 0;
if ((key1->key_flags & DNS_KEYFLAG_EXTENDED) != 0)
isc_buffer_subtract(&b1, 2);
isc_buffer_init(&b2, buf2, sizeof(buf2));
result = dst_key_todns(key2, &b2);
if (result != ISC_R_SUCCESS)
return (ISC_FALSE);
/* Zero out flags. */
buf2[0] = buf2[1] = 0;
if ((key2->key_flags & DNS_KEYFLAG_EXTENDED) != 0)
isc_buffer_subtract(&b2, 2);
isc_buffer_usedregion(&b1, &r1);
/* Remove extended flags. */
if ((key1->key_flags & DNS_KEYFLAG_EXTENDED) != 0) {
memmove(&buf1[4], &buf1[6], r1.length - 6);
r1.length -= 2;
}
isc_buffer_usedregion(&b2, &r2);
/* Remove extended flags. */
if ((key2->key_flags & DNS_KEYFLAG_EXTENDED) != 0) {
memmove(&buf2[4], &buf2[6], r2.length - 6);
r2.length -= 2;
}
return (ISC_TF(isc_region_compare(&r1, &r2) == 0));
}