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NAME

dhcpinfo - display values of parameters received through DHCP
 

SYNOPSIS

dhcpinfo [-c] [-i interface] [-n limit] [-v 4|6] code

dhcpinfo [-c] [-i interface] [-n limit] [-v 4|6] identifier

DESCRIPTION

The dhcpinfo utility prints the DHCP-supplied value(s) of the parameter requested on the command line. The parameter can be identified either by its numeric code in the DHCP specification, or by its mnemonic identifier, as listed in dhcp_inittab(4). This command is intended to be used in command substitutions in the shell scripts invoked by init(1M) at system boot. It first contacts the DHCP client daemon at system boot or in event scripts as described in dhcpagent(1M). It first contacts the DHCP client daemon dhcpagent(1M) to verify that DHCP has successfully completed on the requested interface. If DHCP has successfully completed on the requested interface, dhcpinfo retrieves the values for the requested parameter. Parameter values echoed by dhcpinfo should not be used without checking its exit status. See exit(1).

See dhcp_inittab(4) for the list of mnemonic identifier codes for all DHCP parameters. See RFC 2132, DHCP Options and BOOTP Vendor Extensions for more details on DHCPv4 parameters, and RFC 3315, Dynamic Host Configuration Protocol for IPv6 (DHCPv6), for more details on DHCPv6 parameters.  

Output Format

The output from dhcpinfo consists of one or more lines of ASCII text; the format of the output depends upon the requested parameter. The number of values returned per line and the total number of lines output for a given parameter are determined by the parameter's granularity and maximum values, respectively, as defined by dhcp_inittab(4).

The format of each individual value is determined by the data type of the option, as determined by dhcp_inittab(4). The possible data types and their formats are listed below:

Data Type	Format	dhcp_inittab(4) type
Unsigned Number	One or more decimal digits	UNUMBER8, UNUMBER16, UNUMBER32, UNUMBER64
Signed Number
IP Address
IPv6 Address
Octet
String
DUID
Domain Name

OPTIONS

The following options are supported:

-c

Displays the output in a canonical format. This format is identical to the OCTET format with a granularity of 1.

-i interface

Specifies the interface to retrieve values for DHCP parameters from. If this option is not specified, the primary interface is used.

For DHCPv6, the interface name used should be the name of the physical interface, not one of the logical interfaces created by dhcpagent.

-n limit

Limits the list of values displayed to limit lines.

-v4 | 6

Specifies the DHCP version to query. Use -v4for DHCPv4 and -v6 for DHCPv6.

OPERANDS

The following operands are supported:

code

Numeric code for the requested DHCP parameter, as defined by the DHCP specification. Vendor options are specified by adding 256 to the actual vendor code for DHCPv4, and 65536 for DHCPv6.

identifier

Mnemonic symbol for the requested DHCP parameter, as listed in dhcp_inittab(4).

EXIT STATUS

The following exit values are returned:

0

Successful operation.

2

The operation was not successful. The DHCP client daemon might not be running, the interface might have failed to configure, or no satisfactory DHCP responses were received.

3

Bad arguments.

4

The operation timed out.

6

System error (should never occur).

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE Availability SUNWcsr Interface Stability

SEE ALSO

dhcpagent(1M), ifconfig(1M), init(1M), dhcp_inittab(4), attributes(5)

Alexander, S., and R. Droms, RFC 2132, DHCP Options and BOOTP Vendor Extensions, Silicon Graphics, Inc., Bucknell University, March 1997.

Droms, R. , RFC 3315, Dynamic Host Configuration Protocol for IPv6 (DHCPv6), Cisco Systems, July 2003.

Mockapetris, P.V. , RFC 1035, Domain names - implementation and specification, ISI, November 1987.

Index

NAME

SYNOPSIS

DESCRIPTION

Output Format

OPTIONS

OPERANDS

EXIT STATUS

ATTRIBUTES

SEE ALSO

Партнёры:

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