github continues to deprecate actions and idioms in their CI system.
hopefully these changes will last for a while and maintaining a simple
CI task doesn't turn into a neverending story.

Omit the version number from headers, HTML responses, and templates

makes BasicAuth realm string editable in config file.

closes #235

fixes warning about implicit function declaration which is by default
treated as an error starting with GCC14.

closes #560

if tinyproxy serves as a HTTP server (i.e. when serving stats),
use error code 401, else error code 407.

fixes #532

it turned out that a hashmap isn't the right datastructure, as the
special-case header Set-Cookie not only can, but is even heavily
recommended to be used multiple times.

we now use a dumb list as a key-value store for this purpose, but
restrict it to max 256 entries so the linear search can always be
completed in reasonable time in case of an attack.

closes #403

The following error types are addressed:

https://www.shellcheck.net/wiki/SC2164 -- Use 'cd ... || exit' or 'cd ... || return' in case cd fails.
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing and word splitting.
  https://www.shellcheck.net/wiki/SC2006 -- Use $(...) notation instead of legacy backticks `...`.

Signed-off-by: Michael Adam <[email protected]>

This fixes several instances of the following shellcheck issues:

https://www.shellcheck.net/wiki/SC2046 -- Quote this to prevent word splitting.
https://shellcheck.net/wiki/SC3037 (warning): In POSIX sh, echo flags are undefined.
https://shellchelleck.net/wiki/SC2268 (style): Avoid x-prefix in comparisons as it no longer serves a purpose.
https://shellcheck.net/wiki/SC2009 (info): Consider using pgrep instead of grepping ps output.
https://shellcheck.net/wiki/SC3028 (warning): In POSIX sh, SECONDS is undefined.
SC2059 (info): Don't use variables in the printf format string
 COUNT appears unused. Verify use (or export if used externally).
https://shellcheck.net/wiki/SC2162 (info): read without -r will mangle backslashes.
https://shellcheck.net/wiki/SC2034 (warning): READ appears unused. Verify use (or export if used externally).
https://shellcheck.net/wiki/SC2317 (info): Command appears to be unreachable. Check usage (or ignore if invoked indirectly).
https://shellcheck.net/wiki/SC2086 (info): Double quote to prevent globbing and word splitting.

Signed-off-by: Michael Adam <[email protected]>

tests: fix syntax errors in run_tests.sh

Signed-off-by: Michael Adam <[email protected]>

This fixes instances of:

https://shellcheck.net/wiki/SC2086 (info): Double quote to prevent globbing and word splitting.
https://shellcheck.net/wiki/SC2034 (warning): BASEDIR appears unused.

Signed-off-by: Michael Adam <[email protected]>

This can be used to lint shell scripts
for syntactic correctness and style.

It requires shellcheck to be installed on the host.

Signed-off-by: Michael Adam <[email protected]>

Signed-off-by: Michael Adam <[email protected]>

Signed-off-by: Michael Adam <[email protected]>

due to the use of an invalid macro HAVE_VSYSLOG_H (a corresponding
header doesn't exist on POSIX libcs, plus there was no configure
check setting it), the code here was never compiled in, and the
portable fallback was always used. since the fallback is already
there and known to work as intended, just use it always.

closes #574

the function isn't used anywhere in the current codebase, so don't
waste user's time checking for it.

closes #578