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Extract the add-or-replace-keypin logic into a new function

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We're about to need to call it in another place too.
This commit is contained in:
Nick Mathewson 2015-09-23 11:07:17 -04:00
parent c5e87e33c7
commit efea1e904a
1 changed files with 54 additions and 34 deletions
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88
src/or/keypin.c
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@ -173,6 +173,57 @@ keypin_add_entry_to_map, (keypin_ent_t *ent))
HT_INSERT(edmap, &the_ed_map, ent);
}
/**
* Helper: add 'ent' to the maps, replacing any entries that contradict it.
* Take ownership of 'ent', freeing it if needed.
*
* Return 0 if the entry was a duplicate, -1 if there was a conflict,
* and 1 if there was no conflict.
*/
static int
keypin_add_or_replace_entry_in_map(keypin_ent_t *ent)
{
int r = 1;
keypin_ent_t *ent2 = HT_FIND(rsamap, &the_rsa_map, ent);
keypin_ent_t *ent3 = HT_FIND(edmap, &the_ed_map, ent);
if (ent2 &&
fast_memeq(ent2->ed25519_key, ent->ed25519_key, DIGEST256_LEN)) {
/* We already have this mapping stored. Ignore it. */
tor_free(ent);
return 0;
} else if (ent2 || ent3) {
/* We have a conflict. (If we had no entry, we would have ent2 == ent3
* == NULL. If we had a non-conflicting duplicate, we would have found
* it above.)
*
* We respond by having this entry (ent) supersede all entries that it
* contradicts (ent2 and/or ent3). In other words, if we receive
* <rsa,ed>, we remove all <rsa,ed'> and all <rsa',ed>, for rsa'!=rsa
* and ed'!= ed.
*/
const keypin_ent_t *t;
if (ent2) {
t = HT_REMOVE(rsamap, &the_rsa_map, ent2);
tor_assert(ent2 == t);
t = HT_REMOVE(edmap, &the_ed_map, ent2);
tor_assert(ent2 == t);
}
if (ent3 && ent2 != ent3) {
t = HT_REMOVE(rsamap, &the_rsa_map, ent3);
tor_assert(ent3 == t);
t = HT_REMOVE(edmap, &the_ed_map, ent3);
tor_assert(ent3 == t);
tor_free(ent3);
}
tor_free(ent2);
r = -1;
/* Fall through */
}
keypin_add_entry_to_map(ent);
return r;
}
/**
* Check whether we already have an entry in the key pinning table for a
* router with RSA ID digest <b>rsa_id_digest</b>. If we have no such entry,
@ -321,44 +372,13 @@ keypin_load_journal_impl(const char *data, size_t size)
continue;
}
keypin_ent_t *ent2 = HT_FIND(rsamap, &the_rsa_map, ent);
keypin_ent_t *ent3 = HT_FIND(edmap, &the_ed_map, ent);
if (ent2 &&
fast_memeq(ent2->ed25519_key, ent->ed25519_key, DIGEST256_LEN)) {
/* We already have this mapping stored. Ignore it. */
tor_free(ent);
const int r = keypin_add_or_replace_entry_in_map(ent);
if (r == 0) {
++n_duplicates;
continue;
} else if (ent2 || ent3) {
/* We have a conflict. (If we had no entry, we would have ent2 == ent3
* == NULL. If we had a non-conflicting duplicate, we would have found
* it above.)
*
* We respond by having this entry (ent) supersede all entries that it
* contradicts (ent2 and/or ent3). In other words, if we receive
* <rsa,ed>, we remove all <rsa,ed'> and all <rsa',ed>, for rsa'!=rsa
* and ed'!= ed.
*/
const keypin_ent_t *t;
if (ent2) {
t = HT_REMOVE(rsamap, &the_rsa_map, ent2);
tor_assert(ent2 == t);
t = HT_REMOVE(edmap, &the_ed_map, ent2);
tor_assert(ent2 == t);
}
if (ent3 && ent2 != ent3) {
t = HT_REMOVE(rsamap, &the_rsa_map, ent3);
tor_assert(ent3 == t);
t = HT_REMOVE(edmap, &the_ed_map, ent3);
tor_assert(ent3 == t);
tor_free(ent3);
}
tor_free(ent2);
} else if (r == -1) {
++n_conflicts;
/* Fall through */
}
keypin_add_entry_to_map(ent);
++n_entries;
}