stunnel broken, realpath problem
norman at oclsc.org
Sun Jun 20 22:43:34 CEST 2021
The Solaris 10 i386 stunnel package in unstable,
CSWstunnel 5.50,REV=2018.12.03, doesn't work. It cannot
read any configuration file, always reporting
[!] Invalid configuration file name "/etc/opt/csw/stunnel/stunnel.conf"
[!] realpath: Invalid argument (22)
to standard error on startup (with whatever filename you specify,
I suspect the SPARC version is affected the same way, but I can't
easily test that at the moment.
The trouble is with realpath(3c). Modern versions (including in
Solaris 11, I think) allow calls like s = realpath(p, NULL) to
mean realpath should malloc a buffer for the result; Solaris 10
realpath fails with EINVAL instead. stunnel calls realpath with
second argument NULL, and doesn't expect the error.
A simple workaround is to apply a manual hack while building:
ed src/config.h <<!
i.e. remove the symbol configure made to assert that stunnel
may use realpath.
I fetched stunnel 5.59 (the latest version) directly from
www.stunnel.org, built it with that hack interposed, and all
There are probably more-graceful ways to fix this (maybe there's
an argument to ./configure to tell it to do that? maybe a simple
patch to configure.ac?). Or maybe it's just not worth fixing,
since the bug has probably been there quite a while, and it
only affects Solaris 10. I'm working to move to a newer OS
version myself, so it won't hurt my feelings if you decide to
let sleeping stunnels lie. But here it is if it's worth doing.
I should note that I didn't debug the problem myself; I found
the answer on stunnel.org's mailing list. Due credit:
More information about the users