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45 lines
1.8 KiB
Plaintext
45 lines
1.8 KiB
Plaintext
Xinetd is a replacement for inetd, the internet services daemon.
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Xinetd is not just an inetd replacement. Anybody can use it to
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start servers that don't require privileged ports because xinetd
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does not require that the services in its configuration file be
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listed in /etc/services.
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Its configuration file has a different format than inetd's one
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and it understands different signals. However the signal-to-action
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assignment can be changed.
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It is a lot better than inetd. Here are the reasons:
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1) It can do access control on all services based on:
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a. address of remote host
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b. time of access
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2) Access control works on all services, whether multi-threaded or
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single-threaded and for both the TCP and UDP protocols. All UDP
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packets can be checked as well as all TCP connections.
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3) It provides hard reconfiguration:
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a. kills servers for services that are no longer in the configuration file
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b. kills servers that no longer meet the access control criteria
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4) It can prevent denial-of-access attacks by
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a. placing limits on the number of servers for each service (avoids
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process table overflows)
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b. placing an upper bound on the number of processes it will fork
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c. placing limits on the size of log files it creates
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5) Extensive logging abilities:
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a. for every server started it can log:
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i) the time when the server was started
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ii) the remote host address
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iii) who was the remote user (if the other end runs a RFC-931/RFC-1413
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server)
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iv) how long the server was running
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(i, ii and iii can be logged for failed attempts too).
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b. for some services, if the access control fails, it can
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log information about the attempted access (for example,
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it can log the user name and command for the rsh service)
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6) No limit on number of server arguments
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