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#include "spf.h"
extern char dflag;
extern char vflag;
extern char *netroot;
static int
timeout(void*, char *msg)
{
if(strstr(msg, "alarm")){
fprint(2, "deferred: dns timeout");
exits("deferred: dns timeout");
}
return 0;
}
static Ndbtuple*
tdnsquery(char *r, char *s, char *v)
{
long a;
Ndbtuple *t;
atnotify(timeout, 1);
a = alarm(15*1000);
t = dnsquery(r, s, v);
alarm(a);
atnotify(timeout, 0);
return t;
}
Ndbtuple*
vdnsquery(char *s, char *v, int recur)
{
Ndbtuple *n, *t;
static int nquery;
/* conflicts with standard: must limit to 10 and -> fail */
if(recur > 5 || ++nquery == 25){
fprint(2, "dns query limited %d %d\n", recur, nquery);
return 0;
}
if(dflag)
fprint(2, "dnsquery(%s, %s, %s) ->\n", netroot, s, v);
t = tdnsquery(netroot, s, v);
if(dflag)
for(n = t; n; n = n->entry)
fprint(2, "\t%s\t%s\n", n->attr, n->val);
return t;
}
void
dnreverse(char *s, int l, char *d)
{
char *p, *e, buf[100], *f[15];
int i, n;
n = getfields(d, f, nelem(f), 0, ".");
p = e = buf;
if(l < sizeof buf)
e += l;
else
e += sizeof buf;
for(i = 1; i <= n; i++)
p = seprint(p, e, "%s.", f[n-i]);
if(p > buf)
p = seprint(p-1, e, ".in-addr.arpa");
memmove(s, buf, p-buf+1);
}
int
dncontains(char *d, char *s)
{
loop:
if(!strcmp(d, s))
return 1;
if(!(s = strchr(s, '.')))
return 0;
s++;
goto loop;
}
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