ldx/libpac

C library for handling proxy autoconfiguration (PAC) files.

Libpac

This is a C library for handling proxy autoconfiguration files. You can also use it to test your PAC files.

Libpac is non-blocking and was created with non-blocking, event-based applications in mind. Since several PAC javascript functions might block, it uses a threadpool to execute your PAC javascript code. You supply a notification function to pac_init, and it will be called when a worker thread finished executing your PAC code. You can then schedule an event for your main event loop with the result.

Build

You need autoconf and automake. For the first time, you need to generate configure:

$ autoreconf -i

Then build libpac:

$ ./configure
$ make

To run tests:

$ make check

Note: with old versions, you needed --enable-deep-c-stack for the javascript engine be able to handle deeply recursive stacks (large PAC files with complex checks might require this).

Example

See tests/test_pac.c for an example on how to use libpac.

Testing your PAC file

You can use tests/test_pac to test your PAC file. It takes the path for your PAC file as its first parameter, then an URL and a hostname. E.g.:

$ ./tests/test_pac ~/pac.js http://mysite.com mysite.com
Found proxy PROXY 4.5.6.7:8080; PROXY 7.8.9.10:8080

PAC files can return one or more proxies, or "DIRECT" for a direct connection.

You can also call test_pac with multiple URL/hostname pairs:

$ ./tests/test_pac ~/pac.js http://mysite.com mysite.com http://mysite.net mysite.net
Found proxy PROXY 4.5.6.7:8080
Found proxy PROXY 7.8.9.10:8080

libpac's Issues

Autoconf errors (undefined macros) on RHEL6.5

I am getting the following autoconf errors:

autoconf
configure.ac:11: error: possibly undefined macro: AM_INIT_AUTOMAKE
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
configure.ac:17: error: possibly undefined macro: AC_PROG_LIBTOOL
configure.ac:29: error: possibly undefined macro: AM_CONDITIONAL

A configure script is produced, but when I run it I get the following errors:

./configure
./configure: line 1784: PKG_PROG_PKG_CONFIG: command not found
./configure: line 1786: syntax error near unexpected token foreign' ./configure: line 1786:AM_INIT_AUTOMAKE(foreign subdir-objects)'

No makefile is produced, so make errors out:

make
make: *** No targets specified and no makefile found. Stop.

RangeError: register limit - support for Arrays bigger than 255

pac_example.js.txt
Hello, I've run across an issue. The libraries explodes when the pac script has for example, an Array of more than 255 items.

Attached is an example of a PAC file. Currently the array has 256 items, and it causes libpac to throw an error. But once I comment out one or more Array items, then libpac seems fine

[PAC] Failed to evaluate PAC file: RangeError: register limit (line 262).
Segmentation fault: 11

Could you make this limit greater?