[syslog-ng] Following a file to generate one syslog message per appended line

[Balazs Scheidler]

----- Original message -----
> On 17 July 2012 15:20, Jim Hendrick <jrhendri at maine.rr.com> wrote:
> > hmmm - nothing obvious to me.
> > 
> > Questions that might help
> > - do you know what the message rate for that source is?
> 
> The source is the alerts from an IDS where the messages arrive at
> irregular intervals and often in surges of many messages.
> 
> > - is there anything possibly unusual about the messages themselves?
> > (how is end of line demarked? what are the maximum line lengths?)
> 
> The end of line is demarked by a LF (0x0a).
> 
> $ xxd /srv/snort/snort.fast
> 
> 0000000: 3037 2f31 362d 3134 3a30 333a 3431 2e33   07/16-14:03:41.3
> 0000010: 3837 3339 3020 205b 2a2a 5d20 5b31 3a31   87390   [**] [1:1
> 0000020: 3535 3137 3a31 305d 203c 6574 6831 3e20   5517:10] <eth1>
> 0000030: 5745 422d 434c 4945 4e54 204d 6963 726f   WEB-CLIENT Micro
> 0000040: 736f 6674 2057 696e 646f 7773 2041 5649   soft Windows AVI
> 0000050: 2044 6972 6563 7453 686f 7720 5175 6963     DirectShow Quic
> 0000060: 6b54 696d 6520 7061 7273 696e 6720 6f76   kTime parsing ov
> 0000070: 6572 666c 6f77 2061 7474 656d 7074 205b   erflow attempt [
> 0000080: 2a2a 5d20 5b43 6c61 7373 6966 6963 6174   **] [Classificat
> 0000090: 696f 6e3a 2041 7474 656d 7074 6564 2055   ion: Attempted U
> 00000a0: 7365 7220 5072 6976 696c 6567 6520 4761   ser Privilege Ga
> 00000b0: 696e 5d20 5b50 7269 6f72 6974 793a 2031   in] [Priority: 1
> 00000c0: 5d20 7b54 4350 7d20 322e 3232 2e32 3238   ] {TCP} 2.22.228
> 00000d0: 2e34 303a 3830 202d 3e20 3134 332e 3231   .40:80 -> 143.21
> 00000e0: 302e 3936 2e31 3138 3a36 3238 3732 0a30   0.96.118:62872.0
> 00000f0: 372f 3136 2d31 343a 3033 3a34 312e 3537   7/16-14:03:41.57
> 0000100: 3836 3535 2020 5b2a 2a5d 205b 313a 3135   8655   [**] [1:15
> 0000110: 3531 373a 3130 5d20 3c65 7468 313e 2057   517:10] <eth1> W
> 0000120: 4542 2d43 4c49 454e 5420 4d69 6372 6f73   EB-CLIENT Micros
> 0000130: 6f66 7420 5769 6e64 6f77 7320 4156 4920   oft Windows AVI
> 0000140: 4469 7265 6374 5368 6f77 2051 7569 636b   DirectShow Quick
> 0000150: 5469 6d65 2070 6172 7369 6e67 206f 7665   Time parsing ove
> 0000160: 7266 6c6f 7720 6174 7465 6d70 7420 5b2a   rflow attempt [*
> 0000170: 2a5d 205b 436c 6173 7369 6669 6361 7469   *] [Classificati
> 0000180: 6f6e 3a20 4174 7465 6d70 7465 6420 5573   on: Attempted Us
> 0000190: 6572 2050 7269 7669 6c65 6765 2047 6169   er Privilege Gai
> 00001a0: 6e5d 205b 5072 696f 7269 7479 3a20 315d   n] [Priority: 1]
> 00001b0: 207b 5443 507d 2032 2e32 322e 3232 382e     {TCP} 2.22.228.
> 00001c0: 3430 3a38 3020 2d3e 2031 3433 2e32 3130   40:80 -> 143.210
> 00001d0: 2e39 362e 3131 383a 3632 3837 320a 3037   .96.118:62872.07
> 00001e0: 2f31 362d 3134 3a30 333a 3530 2e39 3534   /16-14:03:50.954
> 00001f0: 3939 3620 205b 2a2a 5d20 5b31 3a35 3930   996   [**] [1:590
> 0000200: 333a 395d 203c 6574 6831 3e20 5350 5957   3:9] <eth1> SPYW
> 0000210: 4152 452d 5055 5420 4164 7761 7265 2064   ARE-PUT Adware d
> 0000220: 6f77 6e6c 6f61 6420 6163 6365 6c65 7261   ownload accelera
> 0000230: 746f 7220 706c 7573 2072 756e 7469 6d65   tor plus runtime
> 0000240: 2064 6574 6563 7469 6f6e 202d 2067 6574     detection - get
> 0000250: 2061 6473 205b 2a2a 5d20 5b43 6c61 7373     ads [**] [Class
> 0000260: 6966 6963 6174 696f 6e3a 204d 6973 6320   ification: Misc
> 0000270: 6163 7469 7669 7479 5d20 5b50 7269 6f72   activity] [Prior
> 0000280: 6974 793a 2033 5d20 7b54 4350 7d20 3134   ity: 3] {TCP} 14
> 0000290: 332e 3231 302e 3139 332e 3639 3a34 3937   3.210.193.69:497
> 00002a0: 3535 202d 3e20 3231 322e 3134 332e 3232   55 -> 212.143.22
> 00002b0: 2e31 3130 3a38 300a 3037 2f31 362d 3134   .110:80.07/16-14
> 00002c0: 3a30 333a 3536 2e34 3536 3034 3320 205b   :03:56.456043   [
> 00002d0: 2a2a 5d20 5b31 3a31 3535 3137 3a31 305d   **] [1:15517:10]
> 00002e0: 203c 6574 6831 3e20 5745 422d 434c 4945     <eth1> WEB-CLIE
> 00002f0: 4e54 204d 6963 726f 736f 6674 2057 696e   NT Microsoft Win
> 0000300: 646f 7773 2041 5649 2044 6972 6563 7453   dows AVI DirectS
> 0000310: 686f 7720 5175 6963 6b54 696d 6520 7061   how QuickTime pa
> 0000320: 7273 696e 6720 6f76 6572 666c 6f77 2061   rsing overflow a
> 0000330: 7474 656d 7074 205b 2a2a 5d20 5b43 6c61   ttempt [**] [Cla
> 0000340: 7373 6966 6963 6174 696f 6e3a 2041 7474   ssification: Att
> 0000350: 656d 7074 6564 2055 7365 7220 5072 6976   empted User Priv
> 0000360: 696c 6567 6520 4761 696e 5d20 5b50 7269   ilege Gain] [Pri
> 0000370: 6f72 6974 793a 2031 5d20 7b54 4350 7d20   ority: 1] {TCP}
> 0000380: 3233 2e36 372e 3235 352e 3536 3a38 3020   23.67.255.56:80
> 0000390: 2d3e 2031 3433 2e32 3130 2e31 3030 2e37   -> 143.210.100.7
> 00003a0: 333a 3535 3539 330a 3037 2f31 362d 3134   3:55593.07/16-14
> 00003b0: 3a30 343a 3434 2e36 3232 3930 3820 205b   :04:44.622908   [
> 00003c0: 2a2a 5d20 5b31 3a31 3131 3932 3a31 325d   **] [1:11192:12]
> <...snip...>
> 
> > I would personally try removing the flags (from source and log lines)
> > and one by one add them back - looking at the changes in behavior (if
> > any), then taking that one back out and adding the other.
> 
> I've tried that to no useful effect unfortunately. It appears that
> flush_lines(1) is the default setting.
> 
> I am wondering whether the file source driver does not treat a lone LF
> as a new line and therefore log_fetch_limit(1) is ineffective? I am
> about to test this.

it should treat one NL (aka LF, ASCII 10) as line terminator. what version of syslog-ng are you using?
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