./net/pen, Load balancer for simple tcp based protocols

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Branch: CURRENT, Version: 0.34.1, Package name: pen-0.34.1, Maintainer: pkgsrc-users

Pen is a load balancer for "simple" tcp based protocols such as http or
smtp. It allows several servers to appear as one to the outside and
automatically detects servers that are down and distributes clients among
the available servers. This gives high availability and scalable

The load balancing algorithm keeps track of clients and will try to
send them back to the server they visited the last time. The client
table has a number of slots (default 2048, settable through command-line
arguments). When the table is full, the least recently used one will
be thrown out to make room for the new one.

This is superior to a simple round-robin algorithm, which sends a client
that connects repeatedly to different servers. Doing so breaks
applications that maintain state between connections in the server,
including most modern web applications.

When pen detects that a server is unavailable, it scans for another
starting with the server after the most recently used one. That way
we get load balancing and "fair" failover for free.

Required to build:

Master sites:

SHA1: 7a1d8a86ab711e217e19bd8ef5c5fea07f3284e5
RMD160: 79ef42beebc32a9fcf25f3b59d52509650bfea42
Filesize: 180.295 KB

Version history: (Expand)

CVS history: (Expand)

   2019-01-10 15:58:56 by Amitai Schleier | Files touched by this commit (3) | Package updated
Log message:
Update to 0.34.1. From the changelog:

- Corrected typo in pen.c per suggestion by Belinda Liu.
  This fixes issue #38.
- Merged pull request from Vincent Bernat for OpenSSL 1.1.0 compatibility.
  This fixes issue #28.
- Allow setting local address for upstream connections. This fixes issue #31.
- New penctl command "source" to set this option.
- Fixed issue #30: UDP not working in combination with a configuration file.
- In epoll.c: check for EPOLLHUP.
- In dsr.c: always use our real mac address, to avoid confusing switches.
- Cleaned up code residue surrounded by "#if 0".
- Added CS_HALFDEAD for UDP streams that haven't seen traffic in a while.
- Bug in pending_and_closing: don't modify the list we're looping over.
- Updated pen manpage.
- Deprecated -Q option (it didn't do anything since kqueue was already the
  default where it was available).
- Fixed error handling in epoll support.
- Added transparent UDP test case to testsuite.sh.
- Contribution from Talik Eichinger: add X-Forwarded-Proto when doing
  SSL decryption.
- Added tarpit test case to testsuite.sh.
- Tarpit functionality to be used with the DSR mode.
- pen.1: removed obsolete -S option, updated defaults for -x and -L.
- In failover_server: sanity checks to failover routine.
- In add_client: add the initial server to .client as well as .initial.
- In failover_server: changed abuse_server to ABUSE_SERVER and emerg_server
  to EMERG_SERVER, to handle their default NO_SERVER values.
  See issue #19 on Github.
- At the suggestion from Marcos Vinicius Rogowski, the hash algorith
  will now include the client port number if the -r (roundrobin)
  option is used. See https://github.com/UlricE/pen/pull/18
- Fixed IP-based client tracking.
- Removed unnecessary #include <pen.h> in dlist.c
- Added UDP mode for Direct Server Return.
- Updated configure.ac for compatibility with CentOS 6.
- Added #ifdef around SSLv3 initialization code in ssl, as
  suggested by jca@openbsd.org.
- Transparent reverse proxy support for Linux, FreeBSD and OpenBSD.
- Allow the client table size to be updated on the fly. Default size still 2048.
- Allow the connection table size to be updated in the fly. Default still 500.
- See penctl.1, options clients_max and conn_max.
- Introduced the macro NO_SERVER to be used instead of -1 to signify
  error conditions and such.
- Removed the fixed server table size along with the -S option.
- Fixed cosmetic bug in startup code which required port to be specified
  on backend servers even if it was the same as the listening port.
- Numerous updates to support the madness that is Windows.
- Fix from Vincent Bernat: segfault when not using SSL.
- DSR support using Netmap on FreeBSD.
- Unbroke DSR on Linux.
- Replaced all calls to perror with debug(..., strerror(errno);
- Updated penlog and penlogd to use diag.[ch].
- More refactoring: broke out conn.[ch], client.[ch], server.[ch],
- Made a hash index such that the load balancer may balance load.
- Broke out Windows code from pen.c into windows.c. Added windows.h.
- Broke out public definitions for dsr into dsr.h.
- Broke out memory management into memory.[ch].
- Broke out dignostic and logging functions into diag.[ch].
- Broke out settings into settings.[ch].
- Broke out access lists into acl.[ch].
- Broke out event initialization into event.[ch].
- Added pen_epoll.h, pen_kqueue.h, pen_poll.h, pen_select.h.
- Broke out pen_aton et al into netconv.[ch].
- Added dsr.c
- Bug in copy_down affecting SSL connections fixed.
- Updated ocsp stapling to be compatible with server name indication.
- Added pen-ocsp.sh script.
- SSL code broken out into ssl.[ch]. SSL context creation broken
  out from ssl_init to ssl_create_context.
- Server Name Indication support. New command to enable:
  ssl_sni_path PATH
  where PATH is the name of a directory containing domain.key,
  domain.crt and domain.ca files for each domain.
- OCSP stapling. New command ssl_ocsp_response filename
  specifies the location of the ocsp response to be stapled.
  The response must be pre-fetched. The idea was borrowed
  from Rob Stradling.
- New command ssl_client_renegotiation_interval specifies the
  minimum number of seconds the client must wait between
  renegotiation requests. Default 3600.
- Enabled SSL session resumption.
- In do_cmd: don't print "ignoring command" for comments starting
  with '#'.
- Added ssl_option no_tlsv1.1 and ssl_option no_tlsv1.2 to disable
  SSL 1.1 and 1.2 respectively.
- Added autoconf check that the ECDHE is available and not disabled.
- Bumped default max connections and listen queue to 500.
- Support for ECDHE cipher suites.
- New commands ssl_option and ssl_ciphers to individually disable
  insecure protocols and ciphers.
- Updated penctl.1 with the new command.
- New knob to tweak max number of pending nonblocking connection
  attempts: pending_max N (default 100).
- Moved dlist prototypes to dlist.h.
- Added check to close idle connections after a period of inactivity.
- Penctl: idle_timeout N (default 0 = never close idle connections).
- Moved git repository to GitHub..
- New feature: dummy server. Rather than acting as a proxy,
  Pen will pretend to be a web server with just barely enough
  functionality to work as a test target.
- Penctl: dummy|no dummy.
- Yet Another command: abort_on_error|no abort_on_error makes
  Pen call abort() (or not) when encountering a fatal error.
- New feature: "reliable idling". Pen will make and maintain a
  number of idle connections to the backend servers. When a connection
  closes, a new one is made (hence "reliable"). Penctl: idlers [N].
- In do_cmd: return diagnostics to penctl so the user can see them,
  instead of uselessly sending them to syslog.
- New penctl commands:
    - socket N (print which connection the socket belongs to)
    - connection N (print info on the specified connection)
    - close N (forcibly close connection N)
- In open_listener: check that the requested port is in range.
- Fixed bug in dlist_insert.
- Even load distribution when a server is unavailable.
- Let pen save the settings for tcp_nodelay and tcp_fastclose.
- Make flush_up and flush_down return the correct value on error.
- Added config.h.win with reasonable settings for Windows.
- Better detection and blacklisting of unavailable servers.
- New penctl commands:
    - tcp_nodelay sets TCP_NODELAY on sockets. Turn off with no tcp_nodelay.
    - tcp_fastclose closes both upstream and downstream sockets if one of them
    - closes theirs. Will take the values up, down, both or off (default).
- Rather than making a table of pending connections every time through
  the main loop, keep them in a doubly linked list which is only updated
  as needed. O(n) -> O(1).
- A bug in udp mode: after successful "connect", do not event_add downfd,
  because it is equal to listenfd and epoll_ctl doesn't like that.
- Module kqueue.c updated.
- Module poll.c: set unused fd:s to -1, or Solaris will say ENOSYS.
- Enable diagnostic messages by default in configure.ac.
- Changed event bookkeeping from stateless to stateful.
- Made keepalive optional and added "keepalive / no keepalive" penctl \ 
- Added windows.c and pen.h to the release tarball.
- More sensible autoconfiguration defaults: poll, kqueue, epoll, openssl and geoip
  are built if found unless explicitly excluded.
- New event management defaults: kqueue, epoll, poll, select in that order.
- New penctl commands: kqueue, epoll, poll, select.
- New command line option: -O cmd where cmd is any penctl command.
  E.g. -O select to use select instead of the compiled-in default.
- New penctl option "listen [address:]port" to allow listening address
  to be changed on the fly or via a configuration file.
- New pen options -i and -u to install and uninstall Pen as a Windows service.
- See pen manpage.
- Reduced default timeout to 3 seconds.
- New autoconf option --enable-debugging to enable debugging code.
- Lots of fixes for compatibility with Windows.
- Fixed bug in mainloop which kept trying to write 0 bytes.
- MinGW port. Use Makefile.win to compile.
- Event management code broken out into select.c, poll.c, kqueue.c and epoll.c.
- New command-line option -m to accept multiple incoming connections in a batch.
- New command-line option -q to set incoming pending connection queue length.
- Close upfd when failing over.
- Adjusted debug logging levels.
- Started on epoll support for Linux.
- Rewrote output_net and output_file to take a variable number of arguments.
- Handle timed out connection attempts in mainloop_kqueue.
- Fixed mainloop_kqueue.
- A lot of code broken out from mainloop_select into separate functions.
- Fixed mainloop_poll.
- Bugfixes related to the new backend connection logic.
- Cleaned up and simplified add_client() and associated circuitry.
- Connections to back end servers are now nonblocking and parallel.
- Removed the -n option and all code explicitly using blocking sockets.
- Removed the -D option and the "delayed forward" feature.
- Renamed server and client fields in the conn, client and server structures
  to better reflect what they are.
- Restructured the add_client, store_client, store_conn and try_server
- Allow write_cfg to save IPv6 and GeoIP access lists.
- Fixed a bug in write_cfg, where Pen would try to write to an unwritable
  file. Reported by Steven Myint
- Return UDP replies from the server to the client.
- UDP load balancing code restructured and bugfixed.
- In mainloop_select: When there is a pending connection, keep accepting
  up to multi_accept times *or* until EAGAIN *or* connection table is full.
  This improves performance under load.
- Updated GeoIP support for IPv6.
- Servers can have ipv6 addresses. It is possible to use a mix of ipv4
  and ipv6 servers:
  ./pen -df -S 2 -r :::2222 [::1]:22 []:22
- In order to allow server addresses with : in them (i.e. ipv6), it is now
  possible to use square brackets around the address part of the server
  specification: [address]:port (e.g. [::1]:8080).
- Pen can now listen on ipv6 sockets in addition to ipv4 and unix ones.
  I.e. things like "pen ::1:2222" are now possible.
- snprintf format errors reported by Christopher Meng fixed in
  pen.c and penctl.c.
- Updated pen manpage to clarify what the control socket does.
- Resist opening control socket running as root.
- Remove the default file name for web log.
- New feature: unix domain listening sockets.
- Redesigned server and client structs to allow ipv6 addresses and require
  less casting (yuck) in the code.
- Updated penctl man page with syntax for IPv6 and GeoIP access lists.
- Fixed cosmetic signedness compiler warnings.
- Moved defines for ACE_IPV4 et al outside #ifdef HAVE_SSL clause.
  Otherwise pen won't compile without ssl.
- GeoIP access lists.
- Added "special exception" clause for linking with OpenSSL.
- Penlog ipv6 compatible.
- Modernized automake configuration.
- Penctl ipv6 compatible.
- Updated autoconf to 2.69.
- Updated SSL code. Protocol ssl2 removed. Default changed to tls1.
- Added UDP patch from Zen.
- Added patch from Debian that fixes some issues with penctl.cgi.
- Priority based server selection algorithm.
- Patch from Stephen P. Schaefer fixes several issues in write_cfg.
- In the server_by_weight function, multiply current connections
  by WEIGHT_FACTOR to make the selection mo fine grained when the
  number of connections is small.
- Patch from Dana Contreras: send stdio to /dev/null after forking.
- Fixed a bunch of cosmetic signedness compiler warnings.
   2016-03-30 00:01:13 by Joerg Sonnenberger | Files touched by this commit (3)
Log message:
Unconditionally remove SSLv2 support. Bump revision.
   2016-03-29 23:46:48 by Pierre Pronchery | Files touched by this commit (2)
Log message:
Fix build without support for SSLv2
   2016-03-05 12:29:49 by Jonathan Perkin | Files touched by this commit (1813) | Package updated
Log message:
Bump PKGREVISION for security/openssl ABI bump.
   2015-11-04 01:35:47 by Alistair G. Crooks | Files touched by this commit (748)
Log message:
Add SHA512 digests for distfiles for net category

Problems found with existing digests:
	Package haproxy distfile haproxy-1.5.14.tar.gz
	159f5beb8fdc6b8059ae51b53dc935d91c0fb51f [recorded]
	da39a3ee5e6b4b0d3255bfef95601890afd80709 [calculated]

Problems found locating distfiles:
	Package bsddip: missing distfile bsddip-1.02.tar.Z
	Package citrix_ica: missing distfile citrix_ica-10.6.115659/en.linuxx86.tar.gz
	Package djbdns: missing distfile djbdns-1.05-test25.diff.bz2
	Package djbdns: missing distfile djbdns-cachestats.patch
	Package djbdns: missing distfile 0002-dnscache-cache-soa-records.patch
	Package gated: missing distfile gated-3-5-11.tar.gz
	Package owncloudclient: missing distfile owncloudclient-2.0.2.tar.xz
	Package poink: missing distfile poink-1.6.tar.gz
	Package ra-rtsp-proxy: missing distfile rtspd-src-
	Package ucspi-ssl: missing distfile ucspi-ssl-0.70-ucspitls-0.1.patch
	Package waste: missing distfile waste-source.tar.gz

Otherwise, existing SHA1 digests verified and found to be the same on
the machine holding the existing distfiles (morden).  All existing
SHA1 digests retained for now as an audit trail.
   2014-02-13 00:18:57 by Matthias Scheler | Files touched by this commit (1568)
Log message:
Recursive PKGREVISION bump for OpenSSL API version bump.
   2013-12-23 12:57:07 by Thomas Klausner | Files touched by this commit (79)
Log message:
Reset maintainer for resigned developers.
   2013-02-07 00:24:19 by Jonathan Perkin | Files touched by this commit (1351) | Package updated
Log message:
PKGREVISION bumps for the security/openssl 1.0.1d update.