/* * This is identical to the above but uses network-format (uncompressed) names. */ int ns_parserr2(ns_msg *handle, ns_sect section, int rrnum, ns_rr2 *rr) { int b; int tmp; /* Make section right. */ tmp = section; if (tmp < 0 || section >= ns_s_max) RETERR(ENODEV); if (section != handle->_sect) setsection(handle, section); /* Make rrnum right. */ if (rrnum == -1) rrnum = handle->_rrnum; if (rrnum < 0 || rrnum >= handle->_counts[(int)section]) RETERR(ENODEV); if (rrnum < handle->_rrnum) setsection(handle, section); if (rrnum > handle->_rrnum) { b = ns_skiprr(handle->_msg_ptr, handle->_eom, section, rrnum - handle->_rrnum); if (b < 0) return (-1); handle->_msg_ptr += b; handle->_rrnum = rrnum; } /* Do the parse. */ b = ns_name_unpack2(handle->_msg, handle->_eom, handle->_msg_ptr, rr->nname, NS_MAXNNAME, &rr->nnamel); if (b < 0) return (-1); handle->_msg_ptr += b; if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom) RETERR(EMSGSIZE); NS_GET16(rr->type, handle->_msg_ptr); NS_GET16(rr->rr_class, handle->_msg_ptr); if (section == ns_s_qd) { rr->ttl = 0; rr->rdlength = 0; rr->rdata = NULL; } else { if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom) RETERR(EMSGSIZE); NS_GET32(rr->ttl, handle->_msg_ptr); NS_GET16(rr->rdlength, handle->_msg_ptr); if (handle->_msg_ptr + rr->rdlength > handle->_eom) RETERR(EMSGSIZE); rr->rdata = handle->_msg_ptr; handle->_msg_ptr += rr->rdlength; } if (++handle->_rrnum > handle->_counts[(int)section]) setsection(handle, (ns_sect)((int)section + 1)); /* All done. */ return (0); }
/*% * Unpack a domain name from a message, source may be compressed. * * return: *\li -1 if it fails, or consumed octets if it succeeds. */ int ns_name_unpack(const u_char *msg, const u_char *eom, const u_char *src, u_char *dst, size_t dstsiz) { return (ns_name_unpack2(msg, eom, src, dst, dstsiz, NULL)); }