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libndb: apply eriks dnsquery() ipv6 reverse lookup patch

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This commit is contained in:
cinap_lenrek 2012-08-02 01:25:34 +02:00
parent 64cb1dd5b4
commit 4971432577
1 changed files with 16 additions and 37 deletions
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53
sys/src/libndb/dnsquery.c
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@ -3,8 +3,8 @@
#include <bio.h>
#include <ndb.h>
#include <ndbhf.h>
#include <ip.h>
static void nstrcpy(char*, char*, int);
static void mkptrname(char*, char*, int);
static Ndbtuple *doquery(int, char *dn, char *type);
@ -77,45 +77,24 @@ dnsquery(char *net, char *val, char *type)
static void
mkptrname(char *ip, char *rip, int rlen)
{
char buf[128];
char *p, *np;
int len;
uchar a[IPaddrlen];
char *p, *e;
int i;
if(cistrstr(ip, "in-addr.arpa") || cistrstr(ip, "ip6.arpa")){
nstrcpy(rip, ip, rlen);
return;
}
nstrcpy(buf, ip, sizeof buf);
/* truncate if result wont fit in rip[rlen] */
assert(rlen > 14);
if((rlen-14) < sizeof(buf))
buf[rlen-14] = 0;
for(p = buf; *p; p++)
;
*p = '.';
np = rip;
len = 0;
while(p >= buf){
len++;
p--;
if(*p == '.'){
memmove(np, p+1, len);
np += len;
len = 0;
if(cistrstr(ip, "in-addr.arpa") || cistrstr(ip, "ip6.arpa") || parseip(a, ip) == -1)
snprint(rip, rlen, "%s", ip);
else if(isv4(a))
snprint(rip, rlen, "%ud.%ud.%ud.%ud.in-addr.arpa",
a[15], a[14], a[13], a[12]);
else{
p = rip;
e = rip + rlen;
for(i = 15; i >= 0; i--){
p = seprint(p, e, "%ux.", a[i]&0xf);
p = seprint(p, e, "%ux.", a[i]>>4);
}
seprint(p, e, "ip6.arpa");
}
memmove(np, p+1, len);
np += len;
strcpy(np, "in-addr.arpa");
}
static void
nstrcpy(char *to, char *from, int len)
{
strncpy(to, from, len);
to[len-1] = 0;
}
static Ndbtuple*