Squashed commit of the following:

commit 1af3efd464
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Mon Nov 7 11:10:22 2016 -0500

    save and restore call recording status to/from redis

    closes #254

    Change-Id: If3cd34fcfd64fa8164521a86eb1d1aa0eb327f3b

commit 460053a231
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Fri Nov 4 14:09:08 2016 -0400

    restore libcurl build dependency

    Change-Id: Ia853f928caf9e443bb69c4015cbba805e6d24153

commit 5f5fd88fde
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Fri Nov 4 11:22:27 2016 -0400

    ensure we are always decrypting SRTP when recording

    Change-Id: I2b75afefcadc55ebf1bf6a19a983134c87c41602

commit 69b4e9fa88
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Fri Nov 4 09:56:47 2016 -0400

    remove redundant ng result=ok logic

    Change-Id: I84d7245f52dc12a4002b4dd2b736afea9ae733fa

commit 411213dd3d
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Nov 3 16:04:54 2016 -0400

    support the `start recording` command message

    Change-Id: I316e90fd3fe34f01b20826936ef620bcff785397

commit ae1910c68d
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Nov 3 15:01:57 2016 -0400

    move logic for `record call` flag to where it belongs

    Change-Id: I65a3b5d62f4360df4251faea1339b5a6355c0e6d

commit 217008d572
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Nov 3 12:49:48 2016 -0400

    support combining streams into one pcap in reference scripts

    Change-Id: Id82936ae7ef1b406acf3b4d3429ecc1cb6e2356e

commit 3fcafd9275
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Nov 3 11:40:00 2016 -0400

    output additional details to metafiles

    Change-Id: I0539a0617aff51c9c499bbd9586d61c7e7ca7e7c

commit e81f413f3b
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Nov 2 16:18:28 2016 -0400

    globalize kernel access variables

    Change-Id: Ie07e0ebb8705189c8b1e49f596080ff8bcaef64f

commit 5e74609c7c
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Nov 2 12:20:55 2016 -0400

    duplicate error messages to stderr when in foreground

    Change-Id: Iaf9d8d1392946046846cb6f2c0fb928a96893911

commit 032077bed4
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Nov 2 11:38:22 2016 -0400

    eliminate dummy virtual function

    Change-Id: I7cc2596f31350bf0d39253b3bd7e9fe1cec2b92d

commit 9177effc4e
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Nov 2 11:30:58 2016 -0400

    clean up recording code related to ng interface

    Change-Id: I69c6d953f8467e5154f000979c94f2dc3a79918a

commit ac0ec6a5e7
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Nov 2 10:57:15 2016 -0400

    output before/after sdp to metafiles

    Change-Id: I1d3177e40591d6b4c4789eb6e18132743a9eda45

commit 68b27fa964
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Nov 1 15:40:20 2016 -0400

    fix header length problems

    Change-Id: I896453f72df3ba146251f5d82ca1d02dd0ad08e9

commit ebbd942ad0
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Nov 1 14:14:08 2016 -0400

    support writing pcap files in reference intercept script

    Change-Id: I53502ba416426e9012a68c35cdf4b457d7c3eb69

commit fe82efa40a
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Nov 1 13:35:47 2016 -0400

    ensure we never make any calls that might sleep when holding locks

    Change-Id: I1ce6aeced1f61715374b80f6fb1fbeafc987ae7f

commit be5316e804
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Nov 1 13:08:19 2016 -0400

    fix math in auto_array_find_free_index

    Change-Id: I39c786b03dbafe59b88a1945ac27964c3852c9eb

commit 183d4939ca
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Nov 1 11:41:47 2016 -0400

    adding rudimentary lock debugging

    Change-Id: Iff541c58e5ea4c3fc2ec16e93396148f935bc4f3

commit 51a75c5022
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Mon Oct 31 14:35:17 2016 -0400

    handle read errors in reference intercept script

    Change-Id: I047d763dbd498026a0d8db24c5532155c75fd6e6

commit 69a460de08
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Mon Oct 31 14:34:54 2016 -0400

    changed locking semantics to avoid proc_clear deadlock

    Change-Id: I70dbc07aa8af7b9860beca86b4b82d8180d8a0ae

commit 62eae1459a
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Mon Oct 31 12:50:26 2016 -0400

    additional debugging

    Change-Id: I81c93c2dd9007ed6a0d6e0b147de0deb44b7b023

commit fd36794740
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Fri Oct 28 12:07:25 2016 -0400

    adding reference implementation using inotify

    Change-Id: Ibec73bdc4c7a576e4beaf5e749567dd2508be4df

commit f8fde6cc73
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Oct 27 15:55:10 2016 -0400

    add stream info to metadata files

    Change-Id: I200df14a3e35c2c0077866444b96692de4303761

commit 5a8b4dd156
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Oct 27 14:47:49 2016 -0400

    pass intercepted packets to kernel and tie in kernel idx

    Change-Id: I33ff297c4a66276b05d0e5d537b0281f27116243

commit 0c0b97ea39
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Oct 27 12:29:02 2016 -0400

    abstractize fake packet header and support ipv6

    Change-Id: I6c1ad1cccad306f3d306fb3387efcb033a3574b2

commit e1b648b9ba
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Oct 27 09:32:40 2016 -0400

    support creating kernel intercept streams

    Change-Id: I1f9bdda61af52814f07f765a8b558a7491cfc0b9

commit b6737ec963
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Oct 26 14:46:13 2016 -0400

    get rid of call->record_call flag

    Change-Id: I04dcba49b07fc669b0bb4bcea8ccc2b52cb76e02

commit 6ed362c120
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Oct 26 12:53:04 2016 -0400

    add recorded call to /proc

    Change-Id: I1fe64b9fb8fe3604bb7d432899c43e3e37ea6a4f

commit 62d2508ecf
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Oct 26 10:10:05 2016 -0400

    simplify some code

    Change-Id: I2a27400e91f58aa8ea20d3e610a7509d2e9a0dfc

commit 0c811a8e91
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Oct 25 16:12:59 2016 -0400

    create separate ../tmp recording dir and clean up duplicate code

    Change-Id: I94e0c19a1e8fed5a30212b79930987333f5e6786

commit 16592a9230
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Oct 25 11:26:54 2016 -0400

    remove explicit libcurl dependency

    finally properly fixes #251

    Change-Id: I3feafe2d0086f6dd789175e6ec0079c54edd487a

commit c78ac5bbb7
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Oct 25 10:48:50 2016 -0400

    abstractize recording cleanup routine

    Change-Id: Ib9fc46542f273bab53f611a1456f02d67edfc966

commit d8358c9a2c
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Oct 25 10:07:44 2016 -0400

    use shorthand for function pointers

    Change-Id: Idf43949e20281a10317e22a5b68a6d133e398bd4

commit 9417437c10
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Mon Oct 24 15:31:56 2016 -0400

    abstractize individual recording functions

    Change-Id: I0974696b6bb361fce39b24d6be91b5c052ee2b14

commit eb631cd876
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Mon Oct 24 11:54:42 2016 -0400

    abstractize call recording mechanism

    Change-Id: If8672051227944544d9cf916d359c5db67235e3e

commit 70797ceb8f
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Jul 14 11:25:05 2016 -0400

    combine two mallocs into one for user-generated packets

    Change-Id: I585d129f10d379a5cb853382773f91a7cec9a98d

commit f62f71cee4
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Jul 13 14:22:18 2016 -0400

    check for and avoid /proc file name collisions

    Change-Id: Ie9eb9ceef8f32de8aba816f0121e768c57fa7402

commit ec6b3d22fc
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Jul 13 11:02:04 2016 -0400

    implement free list

    Change-Id: I3e7dc2325c937923d19ce6000f2cf1c011e51037

commit bd75a1cf25
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Jul 13 09:30:36 2016 -0400

    make number of packets retained per stream configurable

    Change-Id: If1c87f80dd7367cbc274d13c15f94836ef9c8cb1

commit de259c3d64
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Jul 12 15:15:01 2016 -0400

    facilitate passing packets from kernel module out to userspace

    Change-Id: I2317a007084a1718e185ba04632c53a9ebe5f29d

commit 3aa88716fb
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Mon Jul 11 10:45:10 2016 -0400

    restructure calls and streams to global arrays

    Change-Id: Icfca615b21f2e51b1abda4422c4eeb8f4ac70a9b

commit 6cf9980f3e
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Fri Jul 8 11:53:32 2016 -0400

    implement poll/select mechanism

    Change-Id: Ic10c017250f0991f691a887b078e80f694bba853

commit d95829e07b
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Fri Jul 8 10:44:38 2016 -0400

    discard new/old packets as required

    Change-Id: If73ce77dcbc24addb6ce0931b90de0f5efae9f51

commit be1d769e44
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Fri Jul 8 10:25:38 2016 -0400

    implement EOF for stream readers

    Change-Id: I858dc1fdd7df3b65283e1d96457d87e7452840f5

commit ed2d98d55a
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Jul 7 15:02:58 2016 -0400

    blocking and nonblocking reads - incomplete

    Change-Id: I7cbfb09507ad8726773d6a28ddb98d5981decd04

commit 246709c7f4
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Jul 7 13:55:41 2016 -0400

    rudimentary packet reading/dequeuing

    Change-Id: I1a924e5cb2ef4e4f16aeff1f1dd90d0746f91da5

commit 4277493949
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Jul 7 12:40:31 2016 -0400

    use kzalloc where appropriate

    Change-Id: Icd6a109a69ab4f6dc9f7d35fd9e8fc9127f8e7e0

commit 5b07819217
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Jul 7 09:07:54 2016 -0400

    more module referencing

    Change-Id: I2e34fe74f2edef9170a4558f6a24394240966d79

commit 1d8268f636
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Jul 6 14:56:42 2016 -0400

    store delivered packets in queue

    Change-Id: Id349b75e06f9dd77c884196b7726027ac5cab7ae

commit 23c6a53f94
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Jul 6 14:21:27 2016 -0400

    implement call for packet delivery

    Change-Id: Ibeb815bf2fedfdd644d324c65b58a24871d47d4a

commit c8fd855f32
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Jul 6 10:28:18 2016 -0400

    automatic cleanup of objects upon free/delete

    Change-Id: If244905e2d074f491229316f3305c9b0b1451792

commit 282ef603a8
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Jul 6 09:47:29 2016 -0400

    unify read/write functions

    Change-Id: I78b0dd05cd730e16655034994c74cbe23be23fce

commit e74c62cc6f
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Jul 5 15:36:00 2016 -0400

    rename _push to _put and _hold to _get

    Change-Id: I9b0ff5038b541bd3cfb961657c15a26f26ccdfb2

commit d71ce17529
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Jul 5 15:33:07 2016 -0400

    support creation and deletion of streams

    Change-Id: I7df05d232b5971c54ca50adce8144b5f1646fba0

commit 8be4e2c7c4
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Tue Jul 5 11:54:39 2016 -0400

    create functions for redundant code

    Change-Id: Id3772f12294ee9891d22d833274e5935814cae0b

commit 47ce4ca8f5
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Thu Jun 30 12:12:19 2016 -0400

    support creation and deletion of calls objects

    Change-Id: Ie5f9aa978bac21fc30909f14d6a438494848dfd5

commit 8dab54209d
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Jun 29 14:20:23 2016 -0400

    create /proc/.../calls directory

    Change-Id: I682a4bf23edbb72772d64963e3ba2cab2a521ff4

commit 1401ae8db5
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Jun 29 14:02:11 2016 -0400

    rename kernel message enum

    Change-Id: I45d7aeae43df1fe6ecd6b6965dbd6ba7e7b715d8

commit ce44ff0dbe
Author: Richard Fuchs <rfuchs@sipwise.com>
Date:   Wed Jun 29 14:00:32 2016 -0400

    convert kernel message data to union

    Change-Id: I7cfd9fe81623efae0a828ba457aa0a4b1380ff03

Change-Id: I4bb0b7f6d29c1c7a2144e4735ed59f3dc0e37094