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To restart the process, the following command would be used:
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The daemon would then restart after reading in the modified inetd.conf file.
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TCP is a connection-oriented protocol that guarantees delivery of packets, where data has been segmented into smaller units. The benefit of transmitting small units in a guaranteed delivery scheme is that, if checksum errors are detected or some data is not received, the amount of data that needs to be transmitted is very small. In addition, if packet delivery times out, packets can then be retransmitted. By using sequence numbers,
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TCP always manages to reassemble packets in their correct order. Port numbers for TCP (and UDP) services are defined in the /etc/services database. A sample database is shown here:
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Reading from left to right are the service name, port number, transport type, and service aliases. Other services defined in the preceding example include the echo service, which simply sends back the segment transmitted to it, the daytime service, which returns the current local time at the server, ftp, which supports the File Transfer Protocol (FTP) service, and smtp, which supports SMTP. If services are not to be supported on the localhost, then their entries should be commented in the service database. For example, to disable the service definition for the finger service, which allows remote users to check local user details, the finger entry would be modified as follows:
#finger 79/tcp
Port numbers 1 to 1024 are standard, as defined by RFC memos (http://www.rfceditor.org/rfc.html). Nonstandard services can be run on ports above 1024. Some services have been standardized above this maximum by general convention, such as the X11 server.
Application Protocols
Services are implemented by daemons that listen for connections, and generate responses based on specific requests. Many of the TCP service definitions match up with an application supported by a daemon (server) process. There are two types of daemons supported by Solaris: standalone daemons and inetd daemons. Standalone daemons internally manage their own activities, while inetd allows daemons to be run through a single central server. This allows for centralization of administration and reduces the need for processes running on a system, since inetd can listen for connections, and invoke daemon processes as required. Definitions for services are contained in the /etc/inetd.conf file. A sample /etc/inetd.conf file is shown here:
ftp telnet name shell stream stream dgram stream tcp tcp udp tcp nowait nowait wait nowait root root root root /usr/sbin/in.ftpd /usr/sbin/in.telnetd /usr/sbin/in.tnamed /usr/sbin/in.rshd in.ftpd -l in.telnetd in.tnamed in.rshd
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login stream exec stream comsat dgram talk dgram uucp stream tftp dgram /tftpboot finger stream systat stream netstat stream ...
tcp tcp udp udp tcp udp tcp tcp tcp
nowait nowait wait wait nowait wait nowait nowait nowait
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/usr/sbin/in.rlogind /usr/sbin/in.rexecd /usr/sbin/in.comsat /usr/sbin/in.talkd /usr/sbin/in.uucpd /usr/sbin/in.tftpd /usr/sbin/in.fingerd /usr/bin/ps /usr/bin/netstat
in.rlogind in.rexecd in.comsat in.talkd in.uucpd in.tftpd -s in.fingerd ps -ef netstat -f inet
Reading from left to right are the service name, socket type, transport protocol, flags, executing user, and daemon program to execute upon request. Socket types include streams or datagrams, transports include TCP and UDP, and flags include wait (wait after response) and nowait (exit after response). A sample inetd application is the talk service. By examining its definition in /etc/ inetd.conf, you can see that it uses datagram sockets, runs on UDP, waits until timeout, is run by root, is implemented by the command /usr/sbin/in.talkd, and has the name in.talkd. The talk service supports instant communications between users on the local system, or between any two systems on the Internet. To issue a talk request to a remote user, a local user would issue the talk command followed by the user s username and FQDN. For example, to talk to the user shusaku at the host users.cassowary.net, the following command would be used:
$ talk shusaku@users.cassowary.net
If the host users.cassowary.net is running inetd, and inetd supports in.talkd, then the following talk request would appear on the user shusaku s login shell:
Message from Talk_Daemon@db.cassowary.net at 10:50 ... talk: connection requested by yasuanri@db.cassowary.net. talk: respond with: talk yasunari@db.cassowary.net
If the user shusaku wished to talk with yasunari, the following command would be used by shusaku:
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