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67a472d71c
This patch started out with the goal of harmonizing various arbitrary limits on password length, but after awhile a better idea emerged: let's just get rid of those fixed limits. recv_password_packet() has an arbitrary limit on the packet size, which we don't really need, so just drop it. (Note that this doesn't really affect anything for MD5 or SCRAM password verification, since those will hash the user's password to something shorter anyway. It does matter for auth methods that require a cleartext password.) Likewise remove the arbitrary error condition in pg_saslprep(). The remaining limits are mostly in client-side code that prompts for passwords. To improve those, refactor simple_prompt() so that it allocates its own result buffer that can be made as big as necessary. Actually, it proves best to make a separate routine pg_get_line() that has essentially the semantics of fgets(), except that it allocates a suitable result buffer and hence will never return a truncated line. (pg_get_line has a lot of potential applications to replace randomly-sized fgets buffers elsewhere, but I'll leave that for another patch.) I built pg_get_line() atop stringinfo.c, which requires moving that code to src/common/; but that seems fine since it was a poor fit for src/port/ anyway. This patch is mostly mine, but it owes a good deal to Nathan Bossart who pressed for a solution to the password length problem and created a predecessor patch. Also thanks to Peter Eisentraut and Stephen Frost for ideas and discussion. Discussion: https://postgr.es/m/09512C4F-8CB9-4021-B455-EF4C4F0D55A0@amazon.com
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree. This does not preclude their
usefulness.
User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
built automatically, unless you build the "world" target. You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.
Some directories supply new user-defined functions, operators, or
types. To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command. In a fresh database,
you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
procedure.