设备把日志信息以syslog的形式发给agent，日志存储在agent上面的/var/log/xxx.log下面，agent调用/etc/ossim/agent/plugins下面对应的xxx插件来/var/log/xxx.log下面取对应的日志，然后根据插件
里面写的正则表达式来提取日志的关键字段发给server，server再将日志分析之后在ossim上面呈
现出来

/etc/ossim/agent/plugins下面的插件，这些是系统自带的还可以自己来编写插件，核心是掌握正则表达式的写法，能够根据不同的日志来提取自己感兴趣的内容。
aladdin.cfg         lucent-brick.cfg        pureftpd.cfg
allot.cfg           m0n0wall.cfg            radiator.cfg
apache.cfg          malwaredomainlist.cfg   raslogd.cfg
arpalert.cfg        mcafee-antispam.cfg     realsecure.cfg
arpwatch.cfg        mcafee.cfg              rrd.cfg
arpwatch_eth0.cfg   modsecurity.cfg         rsa-secureid.cfg
avast.cfg           moodle.cfg              serviceguard.cfg
bind.cfg            motion.cfg              session-monitor.cfg
bro-ids.cfg         mwcollect.cfg           sidewinder.cfg
cisco-acs.cfg       nagios.cfg              siteprotector.cfg
cisco-ids.cfg       nepenthes.cfg           sitescope.cfg
cisco-ips.cfg       nessus-detector.cfg     snare.cfg
cisco-pix.cfg       nessus-monitor.cfg      snort_syslog.cfg
cisco-router.cfg    netgear.cfg             snortunified.cfg
cisco-***.cfg       netscreen-firewall.cfg  snortunified_eth0.cfg
clamav.cfg          netscreen-manager.cfg   sonicwall.cfg
clurgmgr.cfg        netscreen-nsm.cfg       sophos.cfg
courier.cfg         nmap-monitor.cfg        spamassassin.cfg
cyberguard.cfg      nortel-switch.cfg       squid.cfg
dhcp.cfg            ntop-monitor.cfg        squidGuard.cfg
dragon.cfg          ntsyslog.cfg            ssh.cfg
exchange.cfg        ocs-monitor.cfg         stonegate.cfg
f5.cfg              openldap.cfg            sudo.cfg
fidelis.cfg         opennms-monitor.cfg     symantec-ams.cfg
forensics-db-1.cfg  optenet.cfg             symantec-epm.cfg
fortigate.cfg       oracle1.cfg             syslog.cfg
fw1-alt.cfg         oracle.cfg              tarantella.cfg
fw1ngr60.cfg        osiris.cfg              tcptrack-monitor.cfg
gfi.cfg             ossec.cfg               tippingpoint.cfg
heartbeat.cfg       ossim-agent.cfg         topsec.cfg
honeyd.cfg          ossim-monitor.cfg       trendmicro.cfg
hp-eva.cfg          p0f.cfg                 vmware-workstation.cfg
iis.cfg             p0f_eth0.cfg            vsftpd.cfg
intrushield.cfg     pads.cfg                vyatta.cfg
ipfw.cfg            pads_eth0.cfg           webmin.cfg
iphone.cfg          paloalto.cfg            whois-monitor.cfg
iptables.cfg        pam_unix.cfg            wmi-application-logger.cfg
ironport.cfg        panda-as.cfg            wmi-monitor.cfg
isa.cfg             panda-se.cfg            wmi-security-logger.cfg
juniper-***.cfg     pf.cfg                  wmi-system-logger.cfg
kismet.cfg          ping-monitor.cfg
linuxdhcp.cfg       postfix.cfg
要让agent调用某个插件只需要在这个文件里面写上插件的路径就可以了
/etc/ossim/agent/config.cfg 一下展示部分插件的调用：
[plugins]
arpwatch_eth0=/etc/ossim/agent/plugins/arpwatch_eth0.cfg
nmap-monitor=/etc/ossim/agent/plugins/nmap-monitor.cfg
ntop-monitor=/etc/ossim/agent/plugins/ntop-monitor.cfg
oracle=/etc/ossim/agent/plugins/oracle.cfg
ossec=/etc/ossim/agent/plugins/ossec.cfg
ossim-monitor=/etc/ossim/agent/plugins/ossim-monitor.cfg
p0f_eth0=/etc/ossim/agent/plugins/p0f_eth0.cfg
pads_eth0=/etc/ossim/agent/plugins/pads_eth0.cfg
pam_unix=/etc/ossim/agent/plugins/pam_unix.cfg
ping-monitor=/etc/ossim/agent/plugins/ping-monitor.cfg
squid=/etc/ossim/agent/plugins/squid.cfg
ssh=/etc/ossim/agent/plugins/ssh.cfg
sudo=/etc/ossim/agent/plugins/sudo.cfg
whois-monitor=/etc/ossim/agent/plugins/whois-monitor.cfg
wmi-monitor=/etc/ossim/agent/plugins/wmi-monitor.cfg