/* Copy an RDATA, using compression pointers where RFC1035 permits.
*/
static int
rdcpy(ns_newmsg *handle, ns_type type, const u_char *rdata, size_t rdlen) {
ns_msg *msg = &handle->msg;
u_char *p = (u_char *) (unsigned long) msg->_msg_ptr;
u_char *t = p + NS_INT16SZ;
u_char *s = t;
int n;
switch (type) {
case ns_t_soa:
/* MNAME. */
n = ns_name_pack(rdata, t, msg->_eom - t,
handle->dnptrs, handle->lastdnptr);
if (n < 0)
return (-1);
t += n;
if (ns_name_skip(&rdata, msg->_eom) < 0)
return (-1);
/* ANAME. */
n = ns_name_pack(rdata, t, msg->_eom - t,
handle->dnptrs, handle->lastdnptr);
if (n < 0)
return (-1);
t += n;
if (ns_name_skip(&rdata, msg->_eom) < 0)
return (-1);
/* Serial, Refresh, Retry, Expiry, and Minimum. */
if ((msg->_eom - t) < (NS_INT32SZ * 5)) {
errno = EMSGSIZE;
return (-1);
}
memcpy(t, rdata, NS_INT32SZ * 5);
t += (NS_INT32SZ * 5);
break;
case ns_t_ptr:
case ns_t_cname:
case ns_t_ns:
/* PTRDNAME, CNAME, or NSDNAME. */
n = ns_name_pack(rdata, t, msg->_eom - t,
handle->dnptrs, handle->lastdnptr);
if (n < 0)
return (-1);
t += n;
break;
default:
memcpy(t, rdata, rdlen);
t += rdlen;
}
NS_PUT16(t - s, p);
msg->_msg_ptr = t;
return (0);
}
int dn_skipname(unsigned char *ptr, unsigned char *eom) {
unsigned char *saveptr = ptr;
if (ns_name_skip(&ptr, eom) == -1)
return (-1);
return (ptr - saveptr);
}
/*
* Skip over a compressed domain name. Return the size or -1.
*/
int dn_skipname(const u_char *ptr, const u_char *eom) {
const u_char *saveptr = ptr;
if (ns_name_skip(&ptr, eom) == -1)
return (-1);
return (ptr - saveptr);
}
int main() {
uint8_t A[10];
uint8_t *eom = &A[10];
ns_name_skip(A,eom);
}