155 lines
3.3 KiB
C
155 lines
3.3 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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/* Portions of this file are Copyright (C) 2015-2018 Giacomo Tesio <giacomo@tesio.it>
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* See /doc/license/gpl-2.0.txt for details about the licensing.
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*/
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/* Portions of this file are Copyright (C) 9front's team.
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* See /doc/license/9front-mit for details about the licensing.
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* See http://git.9front.org/plan9front/plan9front/HEAD/info.html for a list of authors.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <bio.h>
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#include <ndb.h>
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#include <ip.h>
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#include "dns.h"
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Area *owned, *delegated;
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/*
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* true if a name is in our area
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*/
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Area*
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inmyarea(char *name)
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{
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int len;
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Area *s, *d;
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len = strlen(name);
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for(s = owned; s; s = s->next){
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if(s->len > len)
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continue;
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if(cistrcmp(s->soarr->owner->name, name + len - s->len) == 0)
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if(len == s->len || name[len - s->len - 1] == '.')
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break;
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}
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if(s == nil)
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return nil;
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/* name is in area `s' */
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for(d = delegated; d; d = d->next){
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if(d->len > len)
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continue;
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if(cistrcmp(d->soarr->owner->name, name + len - d->len) == 0)
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if(len == d->len || name[len - d->len - 1] == '.')
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return nil; /* name is in a delegated subarea */
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}
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return s; /* name is in area `s' and not in a delegated subarea */
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}
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/*
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* our area is the part of the domain tree that
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* we serve
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*/
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void
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addarea(DN *dp, RR *rp, Ndbtuple *t)
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{
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Area *s;
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Area **l;
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jehanne_lock(&dnlock);
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if(t->val[0])
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l = &delegated;
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else
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l = &owned;
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for (s = *l; s != nil; s = s->next)
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if(s->soarr->owner == dp) {
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jehanne_unlock(&dnlock);
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return; /* we've already got one */
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}
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/*
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* The area contains a copy of the soa rr that created it.
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* The owner of the the soa rr should stick around as int32_t
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* as the area does.
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*/
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s = emalloc(sizeof(*s));
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s->len = strlen(dp->name);
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rrcopy(rp, &s->soarr);
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s->soarr->owner = dp;
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s->soarr->db = 1;
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s->soarr->ttl = Hour;
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s->neednotify = 1;
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s->needrefresh = 0;
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if (debug)
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dnslog("new area %s %s", dp->name,
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l == &delegated? "delegated": "owned");
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s->next = *l;
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*l = s;
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jehanne_unlock(&dnlock);
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}
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void
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freearea(Area **l)
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{
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Area *s;
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jehanne_lock(&dnlock);
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while(s = *l){
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*l = s->next;
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rrfree(s->soarr);
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memset(s, 0, sizeof *s); /* cause trouble */
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free(s);
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}
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jehanne_unlock(&dnlock);
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}
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/*
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* refresh all areas that need it
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* this entails running a command 'zonerefreshprogram'. This could
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* copy over databases from elsewhere or just do a zone transfer.
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*/
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void
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refresh_areas(Area *s)
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{
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int pid;
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Waitmsg *w;
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for(; s != nil; s = s->next){
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if(!s->needrefresh)
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continue;
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if(zonerefreshprogram == nil){
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s->needrefresh = 0;
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continue;
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}
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pid = fork();
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if (pid == -1) {
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sleep(1000); /* don't fork again immediately */
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continue;
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}
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if (pid == 0){
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execl(zonerefreshprogram, "zonerefresh",
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s->soarr->owner->name, nil);
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exits("exec zonerefresh failed");
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}
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while ((w = wait()) != nil && w->pid != pid)
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free(w);
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if (w && w->pid == pid)
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if(w->msg == nil || *w->msg == '\0')
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s->needrefresh = 0;
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free(w);
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}
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}
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