mirror of https://github.com/jrbrtsn/ban2fail
87 lines
3.2 KiB
C
87 lines
3.2 KiB
C
/***************************************************************************
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* Copyright (C) 2019 by John D. Robertson *
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* john@rrci.com *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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/*
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* JDR Sat 30 Nov 2019 08:27:23 AM EST
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* Performs DNS reverse + fwd lookups in parallel. Having to use a bunch of threads
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* to overcome the serialization inherent in blocking calls is a travesty, but
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* I couldn't find a non-blocking version of getnameinfo().
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*
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* Oh yeah, and I'm not in the mood to write it myself ;-)
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*/
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#ifndef PARALLEL_DNS_H
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#define PARALLEL_DNS_H
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/* Number of threads to use in parallel */
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#define PDNS_MAX_THREADS 200
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/* Size manager's inbox to avoid overflow */
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#define PDNS_MGR_INBOX_SZ PDNS_MAX_THREADS*2
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#define PDNS_WORKER_INBOX_SZ 1
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/* Give worker threads a chance to join */
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#define PDNS_SHUTDOWN_PAUSE_MS 500
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enum PDNS_flags {
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PDNS_SERVFAIL_FLG= 1<<0,
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PDNS_NXDOMAIN_FLG= 1<<1,
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PDNS_REV_DNS_FLG= 1<<2,
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PDNS_FWD_DNS_FLG= 1<<3,
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PDNS_FWD_FAIL_FLG= 1<<4,
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PDNS_FWD_NONE_FLG= 1<<5,
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PDNS_FWD_MISMATCH_FLG= 1<<6,
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PDNS_DONE_MASK= PDNS_SERVFAIL_FLG|PDNS_NXDOMAIN_FLG|PDNS_FWD_DNS_FLG,
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PDNS_BAD_MASK= PDNS_SERVFAIL_FLG|
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PDNS_NXDOMAIN_FLG|
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PDNS_FWD_FAIL_FLG|
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PDNS_FWD_NONE_FLG|
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PDNS_FWD_MISMATCH_FLG
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};
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#define _GNU_SOURCE
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#include "offEntry.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Fix recursive #include dependency */
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struct _OFFENTRY;
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int
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PDNS_lookup(struct _OFFENTRY *lePtrArr[], unsigned nItems, unsigned timeout_ms);
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/**************************************************************
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* Perform parallel DNS reverse lookups on all OFFENTRY objects
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* referenced in lePtrArr until finished, or timeout_ms has lapsed.
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*
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* lePtrArr: array of pointers to OFFENTRY objects
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* nItems: length of array
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* timeout_ms: maximum amount of time to spend performing lookups.
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*
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* RETURNS
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* suceess - number of lookups completed
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* -1 Failures
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif
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