209 lines
3.7 KiB
Groff
209 lines
3.7 KiB
Groff
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.TH UDHCPC 8 2001-09-26 GNU/Linux "GNU/Linux Administrator's Manual"
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.SH NAME
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udhcpc \- very small DHCP client
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.SH SYNOPSIS
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.B udhcpc
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.RI [ OPTION ]...
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.SH DESCRIPTION
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The udhcp client negotiates a lease with the DHCP server and
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executes a script when it is obtained or lost.
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.SH OPTIONS
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.TP
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.BI \-c\ CLIENTID ,\ \-\-clientid= CLIENTID
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Send the client identifier
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.IR CLIENTID .
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.TP
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.BR -f ,\ \-\-foreground
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Do not fork after obtaining a lease.
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.TP
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.BI \-H\ HOSTNAME ,\ \-\-hostname= HOSTNAME
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Send the client hostname
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.IR HOSTNAME .
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.TP
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.BI \-h\ HOSTNAME
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Alias for -H
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.IR HOSTNAME .
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.TP
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.BI \-i\ INTERFACE ,\ \-\-interface= INTERFACE
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Configure
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.IR INTERFACE .
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.TP
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.BR -n ,\ \-\-now
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Exit with failure if a lease cannot be obtained.
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.TP
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.BI \-p\ FILE ,\ \-\-pidfile= FILE
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Write the process ID of the daemon to
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.IR FILE .
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.TP
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.BR -q ,\ \-\-quit
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Exit after obtaining a lease.
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.TP
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.BI \-r\ ADDRESS ,\ \-\-request= ADDRESS
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Request IP address
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.IR ADDRESS .
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.TP
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.BI \-s\ FILE ,\ \-\-script= FILE
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Use script
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.IR FILE .
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.TP
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.BR -v ,\ \-\-version
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Display version.
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.SH USAGE
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When an event occurs,
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.B udhcpc
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executes a script. There are four possible arguments to this
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script:
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.TP
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.B deconfig
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.B deconfig
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is used when
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.B udhcpc
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starts, and when a lease is lost. The script should put the
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interface in an up, but deconfigured, state.
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.TP
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.B bound
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.B bound
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is used when
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.B udhcpc
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moves from an unbound to a bound state. The script should
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configure the interface and set any other relevant parameters
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(e.g., default gateway, dns server, etc.).
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.TP
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.B renew
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.B renew
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is used when
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.B udhcpc
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when a lease is renewed. The interface is already
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configured, so the IP address will not change. Other parameters
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(e.g., default gateway, subnet mask, dns server) may.
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.TP
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.B nak
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.B nak
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is used when
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.B udhcpc
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receieves a NAK packet from the server. The
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enviromental variable
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.B $message
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will contain the reason for the
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NAK message if the server included one. Processing this message
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is optional, as the script will also be called with deconfig if
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need be.
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.PP
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Parameters are passed to the script via the following environment
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variables:
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.TP
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.B HOME
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The inherited HOME, or "/" if it is unset.
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.TP
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.B PATH
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The inherited PATH, or "/bin:/usr/bin:/sbin:/usr/sbin" if it is
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unset.
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.TP
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.B interface
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The interface.
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.TP
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.B ip
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The client IP address.
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.TP
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.B siaddr
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The BOOTP next server option.
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.TP
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.B sname
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The BOOTP server name option.
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.TP
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.B boot_file
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The BOOTP boot file option.
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.TP
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.B subnet
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The subnet mask.
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.TP
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.B timezone
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The timezone offset from UTC in seconds.
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.TP
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.B router
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The list of routers.
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.TP
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.B timesvr
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The list of time servers.
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.TP
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.B namesvr
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The list of IEN 116 name servers.
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.TP
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.B dns
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The list of DNS servers.
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.TP
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.B logsvr
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The list of MIT-LCS UDP log servers.
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.TP
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.B cookiesvr
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The list of RFC 865 cookie servers.
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.TP
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.B lprsvr
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The list of LPR servers.
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.TP
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.B hostname
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The host name.
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.TP
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.B bootsize
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The length in 512-octet blocks of the bootfile.
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.TP
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.B domain
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The domain name of the network.
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.TP
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.B swapsvr
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The client's swap server.
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.TP
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.B rootpath
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The path of the client's root dist.
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.TP
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.B ipttl
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The TTL.
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.TP
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.B mtu
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The MTU.
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.TP
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.B broadcast
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The broadcast address.
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.TP
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.B ntpsrv
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The list of NTP servers.
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.TP
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.B wins
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The list of WINS servers.
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.TP
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.B lease
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The lease time in seconds.
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.TP
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.B dhcptype
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The DHCP message type (safely ignored).
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.TP
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.B serverid
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The server IP address.
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.TP
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.B message
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Reason for a DHCPNAK.
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.TP
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.B tftp
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The TFTP server name.
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.TP
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.B bootfile
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The bootfile name.
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.SH FILES
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.TP
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.I /usr/share/udhcpc/default.script
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Script run when leases are obtained or lost.
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.SH NOTES
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.B udhcpc
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responds to the following signals:
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.TP
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.B SIGUSR1
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This signal causes
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.B udhcpc
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to renew the current lease or, if it does not have one, obtain a
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new lease.
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.TP
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.B SIGUSR2
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This signal caused
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.B udhcpc
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to release the current lease.
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