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common: add check that pico-valued invoices are round numbers.

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Otherwise you can ask for a sub-millisatoshi amount, which is dumb and
violates the spec.

See-also: https://github.com/lightningnetwork/lightning-rfc/pull/736
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Changed: We now reject invoices which ask for sub-millisatoshi amounts
This commit is contained in:
Rusty Russell
2020-02-03 11:02:19 +10:30
committed by Christian Decker
parent 3e9d4de02e
commit 5d2fdfe66b
2 changed files with 18 additions and 0 deletions
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7
common/test/run-bolt11.c
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@@ -562,6 +562,13 @@ int main(void)
assert(!bolt11_decode(tmpctx, "lnbc2500x1pvjluezpp5qqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqypqdq5xysxxatsyp3k7enxv4jsxqzpujr6jxr9gq9pv6g46y7d20jfkegkg4gljz2ea2a3m9lmvvr95tq2s0kvu70u3axgelz3kyvtp2ywwt0y8hkx2869zq5dll9nelr83zzqqpgl2zg", NULL, &fail));
assert(streq(fail, "Invalid amount postfix 'x'"));
/* BOLT- #11:
* > ### Invalid sub-millisatoshi precision.
* > lnbc2500000001p1pvjluezpp5qqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqypqdq5xysxxatsyp3k7enxv4jsxqzpu7hqtk93pkf7sw55rdv4k9z2vj050rxdr6za9ekfs3nlt5lr89jqpdmxsmlj9urqumg0h9wzpqecw7th56tdms40p2ny9q4ddvjsedzcplva53s
*/
assert(!bolt11_decode(tmpctx, "lnbc2500000001p1pvjluezpp5qqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqypqdq5xysxxatsyp3k7enxv4jsxqzpu7hqtk93pkf7sw55rdv4k9z2vj050rxdr6za9ekfs3nlt5lr89jqpdmxsmlj9urqumg0h9wzpqecw7th56tdms40p2ny9q4ddvjsedzcplva53s", NULL, &fail));
assert(streq(fail, "Invalid sub-millisatoshi amount '2500000001p'"));
/* FIXME: Test the others! */
wally_cleanup(0);
tal_free(tmpctx);