void prepare_bpft(void) { unsigned udp10_mbs, udp10_mbc, udp11_mbs, udp11_mbc; text_list bpfl; text_ptr text; size_t len; /* Prepare the must-be-set and must-be-clear tests. */ udp10_mbs = udp10_mbc = udp11_mbs = udp11_mbc = 0U; if ((dir_wanted & DIR_INITIATE) != 0) { if ((dir_wanted & DIR_RESPONSE) == 0) udp10_mbc |= UDP10_QR_MASK; } else if ((dir_wanted & DIR_RESPONSE) != 0) { udp10_mbs |= UDP10_QR_MASK; } if ((msg_wanted & MSG_UPDATE) != 0) { if ((msg_wanted & (MSG_QUERY | MSG_NOTIFY)) == 0) udp10_mbs |= (ns_o_update << UDP10_OP_SHIFT); } else if ((msg_wanted & MSG_NOTIFY) != 0) { if ((msg_wanted & (MSG_QUERY | MSG_UPDATE)) == 0) udp10_mbs |= (ns_o_notify << UDP10_OP_SHIFT); } else if ((msg_wanted & MSG_QUERY) != 0) { udp10_mbc |= UDP10_OP_MASK; } if (err_wanted == ERR_NO) { udp10_mbc |= UDP10_TC_MASK; udp11_mbc |= UDP11_RC_MASK; } /* * Model * (vlan) and (transport) * (vlan) and ((icmp) or (frags) or (dns)) * (vlan) and ((icmp) or (frags) or ((ports) and (hosts))) * (vlan) and ((icmp) or (frags) or (((tcp) or (udp)) and (hosts))) * [(vlan) and] ( [(icmp) or] [(frags) or] ( ( [(tcp) or] (udp) ) [and (hosts)] ) ) */ /* Make a BPF program to do early course kernel-level filtering. */ INIT_LIST(bpfl); len = 0; if (!EMPTY(vlans_excl)) len += text_add(&bpfl, "vlan and ("); /* vlan and ( transports ... */ else len += text_add(&bpfl, "("); /* ( transports ... */ if (wanticmp) { len += text_add(&bpfl, " ( ip proto 1 or ip proto 58 ) or"); } if (wantfrags) { len += text_add(&bpfl, " ( ip[6:2] & 0x1fff != 0 or ip6[6] = 44 ) or"); } len += text_add(&bpfl, " ("); /* ( dns ... */ len += text_add(&bpfl, " ("); /* ( ports ... */ if (wanttcp) { len += text_add(&bpfl, " ( tcp port %d ) or", dns_port); /* tcp packets can be filtered by initiators/responders, but * not mbs/mbc. */ } len += text_add(&bpfl, " ( udp port %d", dns_port); if (!v6bug) { if (udp10_mbc != 0) len += text_add(&bpfl, " and udp[10] & 0x%x = 0", udp10_mbc); if (udp10_mbs != 0) len += text_add(&bpfl, " and udp[10] & 0x%x = 0x%x", udp10_mbs, udp10_mbs); if (udp11_mbc != 0) len += text_add(&bpfl, " and udp[11] & 0x%x = 0", udp11_mbc); /* Dead code, udp11_mbs never set if (udp11_mbs != 0) len += text_add(&bpfl, " and udp[11] & 0x%x = 0x%x", udp11_mbs, udp11_mbs); */ if (err_wanted != ERR_NO) { len += text_add(&bpfl, " and ("); if ((err_wanted & ERR_TRUNC) != 0) { len += text_add(&bpfl, " udp[10] & 0x%x = 0x%x or", UDP10_TC_MASK, UDP10_TC_MASK); } len += text_add(&bpfl, " 0x%x << (udp[11] & 0xf) & 0x%x != 0 )", ERR_RCODE_BASE, err_wanted); } } len += text_add(&bpfl, " )"); /* ... udp 53 ) */ len += text_add(&bpfl, " )"); /* ... ports ) */ if (options.bpf_hosts_apply_all) { len += text_add(&bpfl, " )"); /* ... dns ) */ len += text_add(&bpfl, " )"); /* ... transport ) */ } if (!EMPTY(initiators) || !EMPTY(responders)) { const char* or = "or", *lp = "(", *sep; endpoint_ptr ep; len += text_add(&bpfl, " and host"); sep = lp; for (ep = HEAD(initiators); ep != NULL; ep = NEXT(ep, link)) { len += text_add(&bpfl, " %s %s", sep, ia_str(ep->ia)); sep = or ; } for (ep = HEAD(responders); ep != NULL; ep = NEXT(ep, link)) { len += text_add(&bpfl, " %s %s", sep, ia_str(ep->ia)); sep = or ; } len += text_add(&bpfl, " )"); } if (!EMPTY(not_initiators) || !EMPTY(not_responders)) { const char* or = "or", *lp = "(", *sep; endpoint_ptr ep; len += text_add(&bpfl, " and not host"); sep = lp; for (ep = HEAD(not_initiators); ep != NULL; ep = NEXT(ep, link)) { len += text_add(&bpfl, " %s %s", sep, ia_str(ep->ia)); sep = or ; } for (ep = HEAD(not_responders); ep != NULL; ep = NEXT(ep, link)) { len += text_add(&bpfl, " %s %s", sep, ia_str(ep->ia)); sep = or ; } len += text_add(&bpfl, " )"); } if (!options.bpf_hosts_apply_all) { len += text_add(&bpfl, " )"); /* ... dns ) */ len += text_add(&bpfl, " )"); /* ... transport ) */ } if (extra_bpf) len += text_add(&bpfl, " and ( %s )", extra_bpf); bpft = calloc(len + 1, sizeof(char)); assert(bpft != NULL); for (text = HEAD(bpfl); text != NULL; text = NEXT(text, link)) strcat(bpft, text->text); text_free(&bpfl); if (!EMPTY(vlans_incl)) { static char* bpft_vlan; len = (2 * strlen(bpft)) + 64; /* add enough for the extra in snprintf() below */ bpft_vlan = calloc(len, sizeof(char)); assert(bpft_vlan != NULL); snprintf(bpft_vlan, len, "( %s ) or ( vlan and ( %s ) )", bpft, bpft); bpft = realloc(bpft, len); assert(bpft != NULL); strcpy(bpft, bpft_vlan); free(bpft_vlan); } if (dumptrace >= 1) fprintf(stderr, "%s: \"%s\"\n", ProgramName, bpft); }
int output_cbor(iaddr from, iaddr to, uint8_t proto, unsigned flags, unsigned sport, unsigned dport, my_bpftimeval ts, const u_char *payload, size_t payloadlen) { ldns_pkt *pkt = 0; ldns_status ldns_rc; if (!payload) { return DUMP_CBOR_EINVAL; } if (!payloadlen) { return DUMP_CBOR_EINVAL; } /* if (!cbor_stringrefs) {*/ /* cbor_stringrefs = calloc(1, cbor_stringref_size);*/ /* }*/ if (!cbor_buf) { if (!(cbor_buf = calloc(1, cbor_size + cbor_reserve))) { return DUMP_CBOR_ENOMEM; } } if (cbor_flushed) { CborError cbor_err; cbor_encoder_init(&cbor_root, cbor_buf, cbor_size, 0); /* cbor_err = cbor_encode_tag(&cbor_root, 256);*/ /* if (cbor_err == CborNoError)*/ cbor_err = cbor_encoder_create_array(&cbor_root, &cbor_pkts, CborIndefiniteLength); if (cbor_err != CborNoError) { fprintf(stderr, "cbor init error[%d]: %s\n", cbor_err, cbor_error_string(cbor_err)); return DUMP_CBOR_ECBOR; } cbor_flushed = 0; } ldns_rc = ldns_wire2pkt(&pkt, payload, payloadlen); if (ldns_rc != LDNS_STATUS_OK) { fprintf(stderr, "ldns error [%d]: %s\n", ldns_rc, ldns_get_errorstr_by_id(ldns_rc)); return DUMP_CBOR_ELDNS; } if (!pkt) { return DUMP_CBOR_ELDNS; } CborEncoder cbor, ip; CborError cbor_err = CborNoError; int should_flush = 0; cbor_err = append_cbor_map(&cbor_pkts, &cbor, CborIndefiniteLength, &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "dateSeconds", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_double(&cbor, (double)ts.tv_sec + ( (double)ts.tv_usec / 1000000 ), &should_flush); /* if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "dateNanoFractions", &should_flush);*/ /* if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, ts.tv_usec * 1000, &should_flush);*/ if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "ip", &should_flush); /* if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, proto, &should_flush);*/ /* if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "sourceIpAddress", &should_flush);*/ /* if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, ia_str(from), &should_flush);*/ /* if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "sourcePort", &should_flush);*/ /* if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, sport, &should_flush);*/ /* if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "destinationIpAddress", &should_flush);*/ /* if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, ia_str(to), &should_flush);*/ /* if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "destinationPort", &should_flush);*/ /* if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, dport, &should_flush);*/ if (cbor_err == CborNoError) cbor_err = append_cbor_array(&cbor, &ip, CborIndefiniteLength, &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&ip, proto, &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&ip, ia_str(from), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&ip, sport, &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&ip, ia_str(to), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&ip, dport, &should_flush); if (cbor_err == CborNoError) cbor_err = close_cbor_container(&cbor, &ip, &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "ID", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, ldns_pkt_id(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "QR", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_boolean(&cbor, ldns_pkt_qr(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "Opcode", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, ldns_pkt_get_opcode(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "AA", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_boolean(&cbor, ldns_pkt_aa(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "TC", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_boolean(&cbor, ldns_pkt_tc(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "RD", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_boolean(&cbor, ldns_pkt_rd(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "RA", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_boolean(&cbor, ldns_pkt_ra(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "AD", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_boolean(&cbor, ldns_pkt_ad(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "CD", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_boolean(&cbor, ldns_pkt_cd(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "RCODE", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, ldns_pkt_get_rcode(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "QDCOUNT", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, ldns_pkt_qdcount(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "ANCOUNT", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, ldns_pkt_ancount(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "NSCOUNT", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, ldns_pkt_nscount(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "ARCOUNT", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, ldns_pkt_arcount(pkt), &should_flush); /* questionRRs */ if (ldns_pkt_qdcount(pkt) > 0) { ldns_rr_list *list = ldns_pkt_question(pkt); ldns_rr *rr; size_t n, qdcount = ldns_pkt_qdcount(pkt); ldns_buffer *dname; char *dname_str; if (!list) { ldns_pkt_free(pkt); return DUMP_CBOR_ELDNS; } rr = ldns_rr_list_rr(list, 0); if (!rr) { ldns_pkt_free(pkt); return DUMP_CBOR_ELDNS; } if (!(dname = ldns_buffer_new(512))) { ldns_pkt_free(pkt); return DUMP_CBOR_ENOMEM; } if (ldns_rdf2buffer_str_dname(dname, ldns_rr_owner(rr)) != LDNS_STATUS_OK) { ldns_buffer_free(dname); ldns_pkt_free(pkt); return DUMP_CBOR_ELDNS; } ldns_buffer_write_u8(dname, 0); if (!(dname_str = ldns_buffer_export(dname))) { ldns_buffer_free(dname); ldns_pkt_free(pkt); return DUMP_CBOR_ENOMEM; } if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "QNAME", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, dname_str, &should_flush); free(dname_str); ldns_buffer_free(dname); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "QCLASS", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, ldns_rr_get_class(rr), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "QTYPE", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&cbor, ldns_rr_get_type(rr), &should_flush); if (qdcount > 1) { CborEncoder queries; if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "questionRRs", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_array(&cbor, &queries, CborIndefiniteLength, &should_flush); for (n = 1; cbor_err == CborNoError && n < qdcount; n++) { CborEncoder query; rr = ldns_rr_list_rr(list, n); if (!rr) { ldns_pkt_free(pkt); return DUMP_CBOR_ELDNS; } if (!(dname = ldns_buffer_new(512))) { ldns_pkt_free(pkt); return DUMP_CBOR_ENOMEM; } if (ldns_rdf2buffer_str_dname(dname, ldns_rr_owner(rr)) != LDNS_STATUS_OK) { ldns_buffer_free(dname); ldns_pkt_free(pkt); return DUMP_CBOR_ELDNS; } ldns_buffer_write_u8(dname, 0); if (!(dname_str = ldns_buffer_export(dname))) { ldns_buffer_free(dname); ldns_pkt_free(pkt); return DUMP_CBOR_ENOMEM; } if (cbor_err == CborNoError) cbor_err = append_cbor_map(&queries, &query, CborIndefiniteLength, &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&query, "NAME", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&query, dname_str, &should_flush); free(dname_str); ldns_buffer_free(dname); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&query, "CLASS", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&query, ldns_rr_get_class(rr), &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&query, "TYPE", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_uint(&query, ldns_rr_get_type(rr), &should_flush); if (cbor_err == CborNoError) cbor_err = close_cbor_container(&queries, &query, &should_flush); } if (cbor_err == CborNoError) cbor_err = close_cbor_container(&cbor, &queries, &should_flush); } } /* answerRRs */ if (ldns_pkt_ancount(pkt) > 0) { CborEncoder cbor_rrs; if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "answerRRs", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_array(&cbor, &cbor_rrs, CborIndefiniteLength, &should_flush); cbor_ldns_rr_list(&cbor_rrs, ldns_pkt_answer(pkt), ldns_pkt_ancount(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = close_cbor_container(&cbor, &cbor_rrs, &should_flush); } /* authorityRRs */ if (ldns_pkt_nscount(pkt) > 0) { CborEncoder cbor_rrs; if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "authorityRRs", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_array(&cbor, &cbor_rrs, CborIndefiniteLength, &should_flush); cbor_ldns_rr_list(&cbor_rrs, ldns_pkt_authority(pkt), ldns_pkt_nscount(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = close_cbor_container(&cbor, &cbor_rrs, &should_flush); } /* additionalRRs */ if (ldns_pkt_arcount(pkt) > 0) { CborEncoder cbor_rrs; if (cbor_err == CborNoError) cbor_err = append_cbor_text_stringz(&cbor, "additionalRRs", &should_flush); if (cbor_err == CborNoError) cbor_err = append_cbor_array(&cbor, &cbor_rrs, CborIndefiniteLength, &should_flush); cbor_ldns_rr_list(&cbor_rrs, ldns_pkt_additional(pkt), ldns_pkt_arcount(pkt), &should_flush); if (cbor_err == CborNoError) cbor_err = close_cbor_container(&cbor, &cbor_rrs, &should_flush); } ldns_pkt_free(pkt); if (cbor_err == CborNoError) cbor_err = close_cbor_container(&cbor_pkts, &cbor, &should_flush); if (cbor_err != CborNoError) { fprintf(stderr, "cbor error[%d]: %s\n", cbor_err, cbor_error_string(cbor_err)); return DUMP_CBOR_ECBOR; } if (should_flush) { if ((cbor_err = cbor_encoder_close_container_checked(&cbor_root, &cbor_pkts)) != CborNoError) { fprintf(stderr, "cbor error[%d]: %s\n", cbor_err, cbor_error_string(cbor_err)); return DUMP_CBOR_ECBOR; } fprintf(stderr, "cbor output: %lu bytes\n", cbor_encoder_get_buffer_size(&cbor_root, cbor_buf)); cbor_flushed = 1; return DUMP_CBOR_FLUSH; } return DUMP_CBOR_OK; }