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#include <u.h>
#include <libc.h>
#include <bio.h>
#include <ndb.h>
#include <ip.h>
#include "dns.h"
Area *owned, *delegated;
static Area*
nameinarea(char *name, Area *s)
{
int len;
for(len = strlen(name); s != nil; s = s->next){
if(s->len > len)
continue;
if(cistrcmp(s->soarr->owner->name, name + len - s->len) == 0)
if(len == s->len || name[len - s->len - 1] == '.')
return s;
}
return nil;
}
/*
* true if a name is in our area
*/
Area*
inmyarea(char *name)
{
Area *s, *d;
s = nameinarea(name, owned);
if(s == nil)
return nil;
d = nameinarea(name, delegated);
if(d && d->len > s->len)
return nil;
return s; /* name is in owned area `s' and not in a delegated subarea */
}
/*
* our area is the part of the domain tree that
* we serve
*/
void
addarea(DN *dp, RR *rp, Ndbtuple *t)
{
Area *s;
Area **l;
int len;
len = strlen(dp->name);
lock(&dnlock);
if(t->val[0])
l = &delegated;
else
l = &owned;
for (s = *l; s != nil; l = &s->next, s = s->next){
if(s->len < len)
break;
if(s->soarr->owner == dp) {
unlock(&dnlock);
return; /* we've already got one */
}
}
/*
* The area contains a copy of the soa rr that created it.
* The owner of the the soa rr should stick around as long
* as the area does.
*/
s = emalloc(sizeof(*s));
s->len = len;
rrcopy(rp, &s->soarr);
s->soarr->owner = dp;
s->soarr->db = 1;
s->soarr->ttl = Hour;
s->neednotify = 1;
s->needrefresh = 0;
if (debug)
dnslog("new area %s %s", dp->name,
l == &delegated? "delegated": "owned");
s->next = *l;
*l = s;
unlock(&dnlock);
}
void
freearea(Area **l)
{
Area *s;
lock(&dnlock);
while(s = *l){
*l = s->next;
rrfree(s->soarr);
memset(s, 0, sizeof *s); /* cause trouble */
free(s);
}
unlock(&dnlock);
}
/*
* refresh all areas that need it
* this entails running a command 'zonerefreshprogram'. This could
* copy over databases from elsewhere or just do a zone transfer.
*/
void
refresh_areas(Area *s)
{
int pid;
Waitmsg *w;
for(; s != nil; s = s->next){
if(!s->needrefresh)
continue;
if(zonerefreshprogram == nil){
s->needrefresh = 0;
continue;
}
pid = fork();
if (pid == -1) {
sleep(1000); /* don't fork again immediately */
continue;
}
if (pid == 0){
execl(zonerefreshprogram, "zonerefresh",
s->soarr->owner->name, nil);
exits("exec zonerefresh failed");
}
while ((w = wait()) != nil && w->pid != pid)
free(w);
if (w && w->pid == pid)
if(w->msg == nil || *w->msg == '\0')
s->needrefresh = 0;
free(w);
}
}
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