2021-07-11 10:20:48 +10:00
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# Overview
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2021-07-11 10:32:28 +10:00
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Script to manage custom /etc/services entries.
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2021-07-11 10:20:48 +10:00
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# Usage
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2021-07-11 10:22:19 +10:00
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Show usage
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2021-07-11 10:20:48 +10:00
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rpearce@crom:serv$ ./serv.sh -h
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usage: ./serv.sh [OPTIONS] command [command_args]
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Manage custom /etc/services entries.
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Valid commands are: diff sync init add del query cat
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-f Force removal of service even if multiple match.
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-w Update system services file (/etc/services)
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-y Same as -w
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2021-07-11 10:22:19 +10:00
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Create working area in ~/.serv/
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2021-07-11 10:20:48 +10:00
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rpearce@crom:serv$ ./serv.sh init
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Initialisation of /Users/rpearce/.serv complete.
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2021-07-11 10:22:19 +10:00
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Add a custom service
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2021-07-11 10:20:48 +10:00
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rpearce@crom:serv$ ./serv.sh add myservice 34777/udp
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Added 'myservice' (34777/udp) to custom services file.
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NOTE: /etc/services not touched - use -w to update it.
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The following changes were NOT made:
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13921a13922,13924
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>
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> # custom services from serv.sh
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> myservice 34777/udp
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2021-07-11 10:22:19 +10:00
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Look up a custom service
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2021-07-11 10:20:48 +10:00
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rpearce@crom:serv$ ./serv.sh query myservice
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Found in custom services file:
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myservice 34777/udp
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2021-07-11 10:22:19 +10:00
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Update system /etc/services with custom services
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2021-07-11 10:20:48 +10:00
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rpearce@crom:serv$ ./serv.sh -w sync
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(using sudo - you may be prompted for your password)
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Password:
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/etc/services updated:
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13921a13922,13924
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>
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> # custom services from serv.sh
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> myservice 34777/udp
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rpearce@crom:serv$ tail -5 /etc/services
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# 48557-49150 Unassigned
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# 49151 IANA Reserved
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# custom services from serv.sh
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myservice 34777/udp
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rpearce@crom:serv$
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2021-07-11 10:32:28 +10:00
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Confirm updates are working
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rpearce@crom:serv$ sudo tcpdump -i lo0 port 34777 &
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[1] 54039
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rpearce@crom:serv$ nc -v -u 127.0.0.1 34777
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10:28:38.061303 IP localhost.58916 > localhost.myservice: UDP, length 1
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10:28:38.061314 IP localhost.58916 > localhost.myservice: UDP, length 1
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10:28:38.061318 IP localhost.58916 > localhost.myservice: UDP, length 1
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10:28:38.061323 IP localhost.58916 > localhost.myservice: UDP, length 1
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Connection to 127.0.0.1 port 34777 [udp/myservice] succeeded!
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rpearce@crom:serv$ sudo kill 54039
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4 packets captured
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178 packets
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rpearce@crom:serv$
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2021-07-11 10:22:19 +10:00
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Remove a custom service, and also update /etc/services
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2021-07-11 10:20:48 +10:00
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rpearce@crom:serv$ ./serv.sh -w rm myservice
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Removed 'myservice' from custom services file (1 line).
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(using sudo - you may be prompted for your password)
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/etc/services updated:
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13924d13923
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< myservice 34777/udp
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rpearce@crom:serv$ tail -5 /etc/services
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com-bardac-dw 48556/udp # com-bardac-dw
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com-bardac-dw 48556/tcp # com-bardac-dw
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# Nicholas J Howes <nick@ghostwood.org>
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# 48557-49150 Unassigned
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# 49151 IANA Reserved
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rpearce@crom:serv$
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