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resolv: fix rotate option

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The rotate option doesn't work correctly, and only send the query to the
same server (the second in the list). The rotation code in itself is not
broken, but the nsaddrs structure is reinitialized each time at the
beginning of __libc_res_nsend unless RES_STAYOPEN is enabled.

This is due to a call to __res_iclose from the end of __libc_res_nsend
when answers from the name server have been received. This function
closes all the sockets, but doesn't free the addresses (it can do that,
but in that case the second argument is false).

This patch change the code of __res_iclose to clear statp->_u._ext.nsinit
 only when the addresses are actually freed.

	* resolv/res_init.c (__res_iclose): Only clear nsinit if the
	addresses have been freed.
This commit is contained in:
Aurelien Jarno 2015-01-06 08:50:23 -08:00 committed by H.J. Lu
parent 5fe55e9c65
commit 38949026b3
2 changed files with 7 additions and 1 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2015-01-06 Aurelien Jarno <aurelien@aurel32.net>
* resolv/res_init.c (__res_iclose): Only clear nsinit if the
addresses have been freed.
2015-01-06 Aurelien Jarno <aurelien@aurel32.net>
* resolv/res_init.c (__res_vinit): Improve comments about nserv

3
resolv/res_init.c
View File

@ -621,7 +621,8 @@ __res_iclose(res_state statp, bool free_addr) {
statp->_u._ext.nsaddrs[ns] = NULL;
}
}
statp->_u._ext.nsinit = 0;
if (free_addr)
statp->_u._ext.nsinit = 0;
}
libc_hidden_def (__res_iclose)