[PATCH v5 0/2] syslogd: filter messages by start of string and include other configs

[Alexander Vickberg]

These patches adds two features to syslogd. First patch adds the ability to
filter log messages by start of string, typically the daemon name. The second
patch adds the ability to include other configuration files using the 'include'
keyword. For example to parse the *.conf files in the folder /etc/syslog.d/ add
'include /etc/syslog.d/' to your main syslog.conf file.

v5 changelog:
* Check msg len before compare
* Bloatchecks updated

v4 changelog:
* Check for ending '[' or ':' when matching string
* Fix wrongfully used continue in second patch
* Bloatchecks updated

v3 changelog:
* actual v2

v2 changelog:
* Some changes in first patch actually belonged to the second
* no need to check file at label cfgerr
* Bloatchecks updated

Bloat check on arm thumb, Yocto dunfell toolchain:
First patch:
function                                             old     new   delta
timestamp_and_log                                    612     712    +100
syslogd_main                                        1652    1732     +80
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 180/0)             Total: 180 bytes

Second patch:
parse_syslogdcfg                                       -     704    +704
.rodata                                            90125   90133      +8
syslogd_main                                        1732    1126    -606
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/1 up/down: 712/-606)          Total: 106 bytes

Bloat check on x86-64, Ubuntu 20.04 toolchain:
First patch:
function                                             old     new   delta
timestamp_and_log                                    785     936    +151
syslogd_main                                        2210    2336    +126
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 277/0)             Total: 277 bytes

Second patch:
function                                             old     new   delta
parse_syslogdcfg                                       -    1056   +1056
.rodata                                            97597   97605      +8
syslogd_main                                        2336    1451    -885
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/1 up/down: 1064/-885)         Total: 179 bytes

Alexander Vickberg (2):
  syslogd: add ability to filter based on start of message
  syslogd: allow to include other config files/dirs

 sysklogd/syslogd.c | 137 +++++++++++++++++++++++++++++++--------------
 1 file changed, 96 insertions(+), 41 deletions(-)

-- 
2.25.1