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e411a8d25a
The protocol documentation states that the maximum length of a cancel key is 256 bytes. This starts checking for that limit in libpq. Otherwise third party backend implementations will probably start using more bytes anyway. We also start requiring that a protocol 3.0 connection does not send a longer cancel key, to make sure that servers don't start breaking old 3.0-only clients by accident. Finally this also restricts the minimum key length to 4 bytes (both in the protocol spec and in the libpq implementation). Author: Jelte Fennema-Nio <postgres@jeltef.nl> Reviewed-by: Jacob Champion <jchampion@postgresql.org> Discussion: https://www.postgresql.org/message-id/df892f9f-5923-4046-9d6f-8c48d8980b50@iki.fi Backpatch-through: 18