Environment Variables Used by sresolv Module

In addition to the standard RES_OPTIONS and LOCALDOMAIN environment variables, the SRES_OPTIONS and SRESOLV_DEBUG variables are supported. More...

Defines
#define	SU_DEBUG
	Environment variable determining the debug log level for sresolv module.
Variables
	SRES_OPTIONS
	Environment variable containing options for Sofia resolver.
	RES_OPTIONS
	Environment variable containing resolver options.
	LOCALDOMAIN
	Environment variable containing search domain.

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Detailed Description

In addition to the standard RES_OPTIONS and LOCALDOMAIN environment variables, the SRES_OPTIONS and SRESOLV_DEBUG variables are supported.

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Define Documentation

#define SU_DEBUG

Environment variable determining the debug log level for sresolv module.

The SRESOLV_DEBUG environment variable is used to determine the debug logging level for sresolv module. The default level is 3.

See also:

<sofia-sip/su_debug.h>, sresolv_log, SOFIA_DEBUG

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Variable Documentation

LOCALDOMAIN

Environment variable containing search domain.

This environment variable is also used by standard BIND resolver.

See also:

Manual page for resolv.conf, RES_OPTIONS, SRES_OPTIONS.

RES_OPTIONS

Environment variable containing resolver options.

This environment variable is also used by standard BIND resolver.

See also:

Manual page for resolv.conf, SRES_OPTIONS.

SRES_OPTIONS

Environment variable containing options for Sofia resolver.

The options recognized by Sofia resolver are as follows:

• debug turn on debugging (no effect)
• ndots:n when searching, try first to query name as absolute domain if it contains at least n dots
• timeout:secs timeout in seconds
• attempts:n fail after n retries
• rotate use round robin selection of nameservers
• no-check-names do not check names for invalid characters
• inet6 (no effect)
• ip6-dotint IPv6 addresses are resolved using suffix ".ip6.int" instead of the standard ".ip6.arpa" suffix
• ip6-bytestring (no effect) The following option is a Sofia-specific extension:
• no-edns0 do not try to use EDNS0 extension (RFC 2671)

The same options can be listed in options directive in resolv.conf, or in RES_OPTIONS environment variable. Note that options given in SRES_OPTIONS override those specified in RES_OPTIONS which in turn override options specified in the options directive of resolve.conf.

The meaning of an option can be reversed with prefix "no-".

See also:

Manual page for resolv.conf, RES_OPTIONS.