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ndb/dnsdebug: handle .ip6.arpa names

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This commit is contained in:
cinap_lenrek 2018-05-23 19:44:12 +02:00
parent 03ced8cca1
commit ad7390dda8
1 changed files with 37 additions and 29 deletions
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66
sys/src/cmd/ndb/dnsdebug.c
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@ -121,6 +121,32 @@ longtime(long t)
return x;
}
/*
* convert address into a reverse lookup address
*/
static void
mkptrname(char *ip, char *rip, int rlen)
{
uchar a[IPaddrlen];
char *p, *e;
int i;
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");
}
}
int
prettyrrfmt(Fmt *f)
{
@ -372,7 +398,6 @@ void
doquery(char *name, char *tstr)
{
int len, type, rooted;
char *p, *np;
char buf[1024];
RR *rr, *rp;
Request req;
@ -387,6 +412,13 @@ doquery(char *name, char *tstr)
else
tstr = "ip";
/* look it up */
type = rrtype(tstr);
if(type < 0){
print("!unknown type %s\n", tstr);
return;
}
/* if name end in '.', remove it */
len = strlen(name);
if(len > 0 && name[len-1] == '.'){
@ -396,34 +428,10 @@ doquery(char *name, char *tstr)
rooted = 0;
/* inverse queries may need to be permuted */
strncpy(buf, name, sizeof buf);
if(strcmp("ptr", tstr) == 0 && cistrstr(name, ".arpa") == nil){
/* TODO: reversing v6 addrs is harder */
for(p = name; *p; p++)
;
*p = '.';
np = buf;
len = 0;
while(p >= name){
len++;
p--;
if(*p == '.'){
memmove(np, p+1, len);
np += len;
len = 0;
}
}
memmove(np, p+1, len);
np += len;
strcpy(np, "in-addr.arpa"); /* TODO: ip6.arpa for v6 */
}
/* look it up */
type = rrtype(tstr);
if(type < 0){
print("!unknown type %s\n", tstr);
return;
}
if(type == Tptr)
mkptrname(name, buf, sizeof buf);
else
strncpy(buf, name, sizeof buf);
memset(&req, 0, sizeof req);
getactivity(&req, 0);