Updated copyright notices to include the year 2018.

lib: introduce i_rand_limit() and i_rand_minmax()

lib: Replace rand.c with i_rand function Replacement for rand

lib: Replace rand_set_seed with srand Makes following commits easier, and also makes sure that rand() will get seeded when used by other libraries.

Updated copyright notices to include the year 2017.

lib: Use arc4random if present

global: freshen copyright git ls-files | xargs perl -p -i -e 's/(\d+)-201[0-5]/$1-2016/g;s/ (201[0-5]) Dovecot/ $1-2016 Dovecot/'

Remove now-unnecessary direct stdlib.h #includes.

Removed all invocations of strtoll() and friends.

global: freshen copyright Robomatically: git ls-files | xargs perl -p -i -e 's/(\d+)-201[0-4]/$1-2015/g;s/ (201[0-4]) Dovecot/ $1-2015 Dovecot/' Happy 2015 everyone! Signed-off-by: Phil Carmody <phil@dovecot.fi>

lib: rand - force reseeding with known seed from environment Use DOVECOT_SRAND=12345 as an environmental variable to force seeding to that number. The logic behind the logging is that the subsequent calls will almost certainly be from random_fill_weak() which expects to have been seeded from a CSPRNG - not a constant! Having this environmental variable set in a production system that expects CSPRNG seeding should be flagging diagnostics. Signed-off-by: Phil Carmody <phil@dovecot.fi>

lib: add rand helper library Initially, just wrap srand() so that we can find out what the last-used seed was. In situations where srand() is called only once (via this helper) this lets us reproduce exactly the same stream of random data again in order to reproduce rare crashes. Signed-off-by: Phil Carmody <phil@dovecot.fi>