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33 .Nd system status server
43 utility is the server which maintains the database used by the
48 Its operation is predicated on the ability to
52 messages on a network.
56 utility operates as both a producer and consumer of status information,
59 (listen mode) option is specified, in which case
60 it acts as a consumer only.
61 As a producer of information it periodically
62 queries the state of the system and constructs
63 status messages which are broadcasted or multicasted on a network.
64 As a consumer of information, it listens for other
66 servers' status messages, validating them, then recording
67 them in a collection of files located in the directory
70 The following options are available:
71 .Bl -tag -width indent
73 Enable insecure mode, which causes
75 to ignore the source port on incoming packets.
80 This is useful if you do not wish to keep dial on demand
81 interfaces permanently active.
83 Enable listen mode, which causes
85 to not broadcast any information.
86 This allows you to monitor other machines'
88 information, without broadcasting your own.
92 to use IP multicast (instead of
93 broadcast) on all interfaces that have
94 the IFF_MULTICAST flag set in their "ifnet" structs
95 (excluding the loopback interface).
97 reports are sent with a time-to-live of 1, to prevent
98 forwarding beyond the directly-connected subnet(s).
102 argument is supplied with the
106 will send IP multicast datagrams with a
109 via a SINGLE interface rather
112 must be between 0 and
113 32 (or MAX_MULTICAST_SCOPE).
120 specifies transmission on one interface only.
126 argument, the program accepts multicast
128 reports from all multicast-capable interfaces.
131 argument is given, it accepts multicast reports from only one interface, the
132 one on which reports are sent (which may be controlled via the host's routing
136 option, the program accepts broadcast or
137 unicast reports from all interfaces.
138 Thus, this program will hear the
139 reports of old, non-multicasting
141 but, if multicasting is used,
144 will not hear the reports generated by this program.
147 The server transmits and receives messages at the port indicated
148 in the ``who'' service specification; see
150 The messages sent and received, are of the form:
151 .Bd -literal -offset indent
153 char out_line[8]; /* tty name */
154 char out_name[8]; /* user id */
155 long out_time; /* time on */
164 char wd_hostname[32];
168 struct outmp we_utmp;
170 } wd_we[1024 / sizeof (struct whoent)];
174 All fields are converted to network byte order prior to
176 The load averages are as calculated by the
178 program, and represent load averages over the 5, 10, and 15 minute
179 intervals prior to a server's transmission; they are multiplied by 100
180 for representation in an integer.
182 included is that returned by the
184 system call, with any trailing domain name omitted.
185 The array at the end of the message contains information about
186 the users logged in to the sending machine.
188 includes the contents of the entry from the user accounting database
189 for each non-idle terminal line and a value indicating the
190 time in seconds since a character was last received on the terminal line.
192 Messages received by the
194 server are discarded unless they originated at an
198 option was specified.
199 In addition, if the host's name, as specified
200 in the message, contains any unprintable
203 message is discarded.
204 Valid messages received by
206 are placed in files named
210 These files contain only the most recent message, in the
211 format described above.
213 Status messages are generated approximately once every
224 Status information should be sent only upon request rather than continuously.
225 People often interpret the server dying
226 or network communication failures
227 as a machine going down.