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rsc 2006-01-27 08:56:16 +00:00
parent 6021858725
commit 18d5a36a28
1 changed files with 68 additions and 70 deletions
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138
src/libndb/sysdnsquery.c
View file

@ -96,56 +96,7 @@ enum
{
MAXRR = 100,
MAXDNS = 4096,
};
static int name2type(char*);
static uchar *skipquestion(uchar*, uchar*, uchar*, int);
static uchar *unpack(uchar*, uchar*, uchar*, Ndbtuple**, int);
static uchar *rrnext(uchar*, uchar*, uchar*, Ndbtuple**);
static Ndbtuple *rrunpack(uchar*, uchar*, uchar**, char*, ...);
static Ndbtuple*
doquery(char *name, char *type)
{
int n, nstype;
uchar *buf, *p;
HEADER *h;
Ndbtuple *t;
if((nstype = name2type(type)) < 0){
werrstr("unknown dns type %s", type);
return nil;
}
buf = malloc(MAXDNS);
if(buf == nil)
return nil;
if((n = res_search(name, ns_c_in, nstype, buf, MAXDNS)) < 0){
free(buf);
return nil;
}
if(n >= MAXDNS){
free(buf);
werrstr("too much dns information");
return nil;
}
h = (HEADER*)buf;
h->qdcount = ntohs(h->qdcount);
h->ancount = ntohs(h->ancount);
h->nscount = ntohs(h->nscount);
h->arcount = ntohs(h->arcount);
p = buf+sizeof(HEADER);
p = skipquestion(buf, buf+n, p, h->qdcount);
p = unpack(buf, buf+n, p, &t, h->ancount);
USED(p);
return t;
}
enum
{
/* RR types */
Ta= 1,
Tns= 2,
@ -187,6 +138,53 @@ enum
};
static int name2type(char*);
static uchar *skipquestion(uchar*, uchar*, uchar*, int);
static uchar *unpack(uchar*, uchar*, uchar*, Ndbtuple**, int);
static uchar *rrnext(uchar*, uchar*, uchar*, Ndbtuple**);
static Ndbtuple *rrunpack(uchar*, uchar*, uchar**, char*, ...);
static Ndbtuple*
doquery(char *name, char *type)
{
int n, nstype;
uchar *buf, *p;
HEADER *h;
Ndbtuple *t;
if((nstype = name2type(type)) < 0){
werrstr("unknown dns type %s", type);
return nil;
}
buf = malloc(MAXDNS);
if(buf == nil)
return nil;
if((n = res_search(name, Cin, nstype, buf, MAXDNS)) < 0){
free(buf);
return nil;
}
if(n >= MAXDNS){
free(buf);
werrstr("too much dns information");
return nil;
}
h = (HEADER*)buf;
h->qdcount = ntohs(h->qdcount);
h->ancount = ntohs(h->ancount);
h->nscount = ntohs(h->nscount);
h->arcount = ntohs(h->arcount);
p = buf+sizeof(HEADER);
p = skipquestion(buf, buf+n, p, h->qdcount);
p = unpack(buf, buf+n, p, &t, h->ancount);
USED(p);
return t;
}
static struct {
char *s;
int t;
@ -315,7 +313,7 @@ rrnext(uchar *buf, uchar *ebuf, uchar *p, Ndbtuple **tt)
rrlen = G2(p+8);
p += 10;
if(rrtype == ns_t_ptr)
if(rrtype == Tptr)
first = ndbnew("ptr", b);
else
first = ndbnew("dom", b);
@ -323,27 +321,27 @@ rrnext(uchar *buf, uchar *ebuf, uchar *p, Ndbtuple **tt)
switch(rrtype){
default:
goto end;
case ns_t_hinfo:
case Thinfo:
t = rrunpack(buf, ebuf, &p, "YY", "cpu", "os");
break;
case ns_t_minfo:
case Tminfo:
t = rrunpack(buf, ebuf, &p, "NN", "mbox", "mbox");
break;
case ns_t_mx:
case Tmx:
t = rrunpack(buf, ebuf, &p, "SN", "pref", "mx");
break;
case ns_t_cname:
case ns_t_md:
case ns_t_mf:
case ns_t_mg:
case ns_t_mr:
case ns_t_mb:
case ns_t_ns:
case ns_t_ptr:
case ns_t_rp:
case Tcname:
case Tmd:
case Tmf:
case Tmg:
case Tmr:
case Tmb:
case Tns:
case Tptr:
case Trp:
t = rrunpack(buf, ebuf, &p, "N", type2name(rrtype));
break;
case ns_t_a:
case Ta:
if(rrlen != IPv4addrlen)
goto corrupt;
memmove(ip, v4prefix, IPaddrlen);
@ -352,37 +350,37 @@ rrnext(uchar *buf, uchar *ebuf, uchar *p, Ndbtuple **tt)
t = ndbnew("ip", tmp);
p += rrlen;
break;
case ns_t_aaaa:
case Taaaa:
if(rrlen != IPaddrlen)
goto corrupt;
snprint(tmp, sizeof tmp, "%I", ip);
t = ndbnew("ip", tmp);
p += rrlen;
break;
case ns_t_null:
case Tnull:
snprint(tmp, sizeof tmp, "%.*H", rrlen, p);
t = ndbnew("null", tmp);
p += rrlen;
break;
case ns_t_txt:
case Ttxt:
t = rrunpack(buf, ebuf, &p, "Y", "txt");
break;
case ns_t_soa:
case Tsoa:
t = rrunpack(buf, ebuf, &p, "NNLLLLL", "ns", "mbox",
"serial", "refresh", "retry", "expire", "ttl");
break;
case ns_t_key:
case Tkey:
t = rrunpack(buf, ebuf, &p, "SCCY", "flags", "proto", "alg", "key");
break;
case ns_t_sig:
case Tsig:
t = rrunpack(buf, ebuf, &p, "SCCLLLSNY", "type", "alg", "labels",
"ttl", "exp", "incep", "tag", "signer", "sig");
break;
case ns_t_cert:
case Tcert:
t = rrunpack(buf, ebuf, &p, "SSCY", "type", "tag", "alg", "cert");
break;
}