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Add support for timeout: and attempts: resolver options.

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Submitted by:	Paul Vixie <paul@vix.com> / ISC
MFC After:	1 week
This commit is contained in:
Murray Stokely 2003-12-07 12:32:24 +00:00
parent 7c1da7529a
commit a298e0ba03
3 changed files with 37 additions and 1 deletions
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2
include/resolv.h
View File

@ -94,6 +94,8 @@
#define RES_TIMEOUT 5 /* min. seconds between retries */
#define MAXRESOLVSORT 10 /* number of net to sort on */
#define RES_MAXNDOTS 15 /* should reflect bit field size */
#define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */
#define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */
struct __res_state {
int retrans; /* retransmition time interval */

20
lib/libc/net/res_init.c
View File

@ -523,6 +523,26 @@ res_setoptions(options, source)
#ifdef DEBUG
if (_res.options & RES_DEBUG)
printf(";;\tndots=%d\n", _res.ndots);
#endif
} else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
i = atoi(cp + sizeof("timeout:") - 1);
if (i <= RES_MAXRETRANS)
_res.retrans = i;
else
_res.retrans = RES_MAXRETRANS;
#ifdef DEBUG
if (_res.options & RES_DEBUG)
printf(";;\ttimeout=%d\n", _res.retrans);
#endif
} else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
i = atoi(cp + sizeof("attempts:") - 1);
if (i <= RES_MAXRETRY)
_res.retry = i;
else
_res.retry = RES_MAXRETRY;
#ifdef DEBUG
if (_res.options & RES_DEBUG)
printf(";;\tretry=%d\n", _res.retry);
#endif
} else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
#ifdef DEBUG

16
share/man/man5/resolver.5
View File

@ -130,7 +130,7 @@ is one of the following:
sets
.Dv RES_DEBUG
in _res.options.
.It Sy ndots:n
.It Sy ndots: Ns Ar n
sets a threshold for the number of dots which must appear in a name given to
.Fn res_query
(see
@ -146,6 +146,20 @@ meaning that if there are any dots in a name, the name
will be tried first as an absolute name before any
.Em search list
elements are appended to it.
.It Sy timeout: Ns Ar n
sets the amount of time the resolver will wait for a response from a remote
name server before retrying the query via a different name server. Measured in
seconds, the default is
.Dv RES_TIMEOUT
(see
.Pa <resolv.h> ) .
.It Sy attempts: Ns Ar n
sets the number of times the resolver will send a query to its name servers
before giving up and returning an error to the calling application. The
default is
.Dv RES_DFLRETRY
(see
.Pa <resolv.h> ) .
.It Sy no_tld_query
tells the resolver not to attempt to resolve a top level domain name, that
is, a name that contains no dots. Use of this option doesn't prevent