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History log of /src/usr.sbin/lpr/filters/lpf.c
RevisionDateAuthorComments
 1.15  03-Feb-2019  mrg - add or adjust /* FALLTHROUGH */ where appropriate
- add __unreachable() after functions that can return but won't in
this case, and thus can't be marked __dead easily
 1.14  30-Aug-2011  joerg branches: 1.14.42;
static, __printflike, __dead
 1.13  21-Jul-2008  lukem Remove the \n and tabs from the __COPYRIGHT() strings.
Tweak to use a consistent format.
 1.12  07-May-2008  christos branches: 1.12.2;
patch from Dennis den Brok for foomatic
 1.11  07-Aug-2003  agc branches: 1.11.30;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22366, verified by myself.
 1.10  14-Jul-2002  wiz Unifdef __STDC__. Remove __P(). ANSIfy.
 1.9  30-Apr-2000  thorpej Need <string.h> for memset() prototype.
 1.8  29-Apr-2000  abs lpf used its own broken argv parsing (-h without an argument would dump core)
Convert to getopt() and add a basic usage()
 1.7  07-Dec-1999  mrg - add timeouts to displayq(), rmremote(), sendfile() and response(),
and use these timeout in the lpq, lpd and lprm programs.

these stop hung remote printers that accept tcp connections but do
not process jobs from hanging the whole system and letting the sysadmin
have a clue about what is going on with this rogue printer.

- add a -r flag to lpd to allow `of' filters for remote jobs.

i know there are ways around this, but i just don't care.

- add a -f flag to lpf to add missing carriage returns.

useful when printing UNIX files to an, eg, LaserWriter that wants CR's
as well as LF's in raw text. stair-stepped text is no fun.

- implement child process accounting: we just have a limit on the number
of children we can have (settable by the sysadmin), and we sleep when
this number is reached. this can reduce malicious not-so-malicious
attacks on the print server by a rogue remote client..

- use setproctitle() where appropriate so the sysadmin has a clue about
what each of the lpd's here are doing.

this was useful to help diagnose a problem (that the above child process
accounting change reduces the lossages of) where a rogue client was
attempting "lpq" operations on one stuck queue in rapid succession,
causing the lpd server to be extremely slow, due to the large number
of lpd processes running.


i have been running these changes in production for about a year.
 1.6  05-Oct-1997  mrg branches: 1.6.8;
- WARNS?=1
- be safe with unlinking files (from freebsd)
- remove register
- clean up $NetBSD$'s.
- use inet_ntoa() in one place (from openbsd)
- nul terminate after a bunch of strncpy()'s
- #ifdef __STDC__ rather than #if (from freebsd)
- be safe with a bunch of string operations (from freebsd)
- use warn()/err() over home grown versions (some from freebsd)
- rename warn() to nodaemon() to remove conflict with above
- check errno from failed kill(2) against ESRCH (from freebsd)
- use getopt() rather than home grown versions (from freebsd)
- clean up a bunch of man pages (some from freebsd)
- check for hostname spoof (from freebsd)
- use POSIX wait() interfaces
- use sysconf(_SC_OPEN_MAX) in preference to NOFILE (from freebsd)
- deal with fork() failure
- index/rindex -> strchr/strrchr (some from freebsd)
- add B57600 and B115200 speeds (from freebsd)
- some KNF
- be safe with files passed in over the network (some from freebsd)
- check return value of malloc(), calloc() and strdup()
 1.5  10-Jul-1997  mikel add parens (gcc -Wall)
 1.4  15-Nov-1995  pk Add RCSIDs
 1.3  18-May-1994  cgd clean up that import. no rcsids yet.
 1.2  01-Aug-1993  mycroft Add RCS identifiers.
 1.1  21-Mar-1993  cgd branches: 1.1.1;
Initial revision
 1.1.1.2  18-May-1994  cgd lpr from 4.4-Lite
 1.1.1.1  21-Mar-1993  cgd initial import of 386bsd-0.1 sources
 1.6.8.1  27-Dec-1999  wrstuden Pull up to last week's -current.
 1.11.30.1  18-May-2008  yamt sync with head.
 1.12.2.1  18-Sep-2008  wrstuden Sync with wrstuden-revivesa-base-2.
 1.14.42.1  10-Jun-2019  christos Sync with HEAD

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