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-rw-r--r--src/utils/common/exec.c692
1 files changed, 692 insertions, 0 deletions
diff --git a/src/utils/common/exec.c b/src/utils/common/exec.c
new file mode 100644
index 0000000..1d97600
--- /dev/null
+++ b/src/utils/common/exec.c
@@ -0,0 +1,692 @@
+/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <arpa/inet.h>
+#include <stdlib.h>
+#include <time.h>
+
+#include "libdnssec/random.h"
+#include "utils/common/exec.h"
+#include "utils/common/msg.h"
+#include "utils/common/netio.h"
+#include "utils/common/params.h"
+#include "libknot/libknot.h"
+#include "contrib/ctype.h"
+#include "contrib/sockaddr.h"
+#include "contrib/openbsd/strlcat.h"
+#include "contrib/ucw/lists.h"
+#include "contrib/wire_ctx.h"
+
+static knot_lookup_t rtypes[] = {
+ { KNOT_RRTYPE_A, "has IPv4 address" },
+ { KNOT_RRTYPE_NS, "nameserver is" },
+ { KNOT_RRTYPE_CNAME, "is an alias for" },
+ { KNOT_RRTYPE_SOA, "start of authority is" },
+ { KNOT_RRTYPE_PTR, "points to" },
+ { KNOT_RRTYPE_MX, "mail is handled by" },
+ { KNOT_RRTYPE_TXT, "description is" },
+ { KNOT_RRTYPE_AAAA, "has IPv6 address" },
+ { KNOT_RRTYPE_LOC, "location is" },
+ { KNOT_RRTYPE_DS, "delegation signature is" },
+ { KNOT_RRTYPE_SSHFP, "SSH fingerprint is" },
+ { KNOT_RRTYPE_RRSIG, "RR set signature is" },
+ { KNOT_RRTYPE_DNSKEY, "DNSSEC key is" },
+ { KNOT_RRTYPE_TLSA, "has TLS certificate" },
+ { 0, NULL }
+};
+
+static void print_header(const knot_pkt_t *packet, const style_t *style)
+{
+ char flags[64] = "";
+ char unknown_rcode[64] = "";
+ char unknown_opcode[64] = "";
+
+ const char *rcode_str = NULL;
+ const char *opcode_str = NULL;
+
+ // Get extended RCODE.
+ const char *code_name = knot_pkt_ext_rcode_name(packet);
+ if (code_name[0] != '\0') {
+ rcode_str = code_name;
+ } else {
+ uint16_t code = knot_pkt_ext_rcode(packet);
+ (void)snprintf(unknown_rcode, sizeof(unknown_rcode), "RCODE %d", code);
+ rcode_str = unknown_rcode;
+ }
+
+ // Get OPCODE.
+ uint8_t code = knot_wire_get_opcode(packet->wire);
+ const knot_lookup_t *opcode = knot_lookup_by_id(knot_opcode_names, code);
+ if (opcode != NULL) {
+ opcode_str = opcode->name;
+ } else {
+ (void)snprintf(unknown_opcode, sizeof(unknown_opcode), "OPCODE %d", code);
+ opcode_str = unknown_opcode;
+ }
+
+ // Get flags.
+ size_t flags_rest = sizeof(flags);
+ const size_t flag_len = 4;
+ if (knot_wire_get_qr(packet->wire) != 0 && flags_rest > flag_len) {
+ flags_rest -= strlcat(flags, " qr", flags_rest);
+ }
+ if (knot_wire_get_aa(packet->wire) != 0 && flags_rest > flag_len) {
+ flags_rest -= strlcat(flags, " aa", flags_rest);
+ }
+ if (knot_wire_get_tc(packet->wire) != 0 && flags_rest > flag_len) {
+ flags_rest -= strlcat(flags, " tc", flags_rest);
+ }
+ if (knot_wire_get_rd(packet->wire) != 0 && flags_rest > flag_len) {
+ flags_rest -= strlcat(flags, " rd", flags_rest);
+ }
+ if (knot_wire_get_ra(packet->wire) != 0 && flags_rest > flag_len) {
+ flags_rest -= strlcat(flags, " ra", flags_rest);
+ }
+ if (knot_wire_get_z(packet->wire) != 0 && flags_rest > flag_len) {
+ flags_rest -= strlcat(flags, " z", flags_rest);
+ }
+ if (knot_wire_get_ad(packet->wire) != 0 && flags_rest > flag_len) {
+ flags_rest -= strlcat(flags, " ad", flags_rest);
+ }
+ if (knot_wire_get_cd(packet->wire) != 0 && flags_rest > flag_len) {
+ strlcat(flags, " cd", flags_rest);
+ }
+
+ uint16_t id = knot_wire_get_id(packet->wire);
+ uint16_t qdcount = knot_wire_get_qdcount(packet->wire);
+ uint16_t ancount = knot_wire_get_ancount(packet->wire);
+ uint16_t nscount = knot_wire_get_nscount(packet->wire);
+ uint16_t arcount = knot_wire_get_arcount(packet->wire);
+
+ if (knot_pkt_has_tsig(packet)) {
+ arcount++;
+ }
+
+ // Print formatted info.
+ switch (style->format) {
+ case FORMAT_NSUPDATE:
+ printf(";; ->>HEADER<<- opcode: %s; status: %s; id: %u\n"
+ ";; Flags:%1s; "
+ "ZONE: %u; PREREQ: %u; UPDATE: %u; ADDITIONAL: %u\n",
+ opcode_str, rcode_str, id, flags, qdcount, ancount,
+ nscount, arcount);
+ break;
+ default:
+ printf(";; ->>HEADER<<- opcode: %s; status: %s; id: %u\n"
+ ";; Flags:%1s; "
+ "QUERY: %u; ANSWER: %u; AUTHORITY: %u; ADDITIONAL: %u\n",
+ opcode_str, rcode_str, id, flags, qdcount, ancount,
+ nscount, arcount);
+ break;
+ }
+}
+
+static void print_footer(const size_t total_len,
+ const size_t msg_count,
+ const size_t rr_count,
+ const net_t *net,
+ const float elapsed,
+ time_t exec_time,
+ const bool incoming)
+{
+ struct tm tm;
+ char date[64];
+
+ // Get current timestamp.
+ if (exec_time == 0) {
+ exec_time = time(NULL);
+ }
+
+ // Create formatted date-time string.
+ localtime_r(&exec_time, &tm);
+ strftime(date, sizeof(date), "%Y-%m-%d %H:%M:%S %Z", &tm);
+
+ // Print messages statistics.
+ if (incoming) {
+ printf(";; Received %zu B", total_len);
+ } else {
+ printf(";; Sent %zu B", total_len);
+ }
+
+ // If multimessage (XFR) print additional statistics.
+ if (msg_count > 0) {
+ printf(" (%zu messages, %zu records)\n", msg_count, rr_count);
+ } else {
+ printf("\n");
+ }
+ // Print date.
+ printf(";; Time %s\n", date);
+
+ // Print connection statistics.
+ if (net != NULL) {
+ if (incoming) {
+ printf(";; From %s", net->remote_str);
+ } else {
+ printf(";; To %s", net->remote_str);
+ }
+
+ if (elapsed >= 0) {
+ printf(" in %.1f ms\n", elapsed);
+ } else {
+ printf("\n");
+ }
+ }
+}
+
+static void print_hex(const uint8_t *data, uint16_t len)
+{
+ for (int i = 0; i < len; i++) {
+ printf("%02X", data[i]);
+ }
+}
+
+static void print_nsid(const uint8_t *data, uint16_t len)
+{
+ if (len == 0) {
+ return;
+ }
+
+ print_hex(data, len);
+
+ // Check if printable string.
+ for (int i = 0; i < len; i++) {
+ if (!is_print(data[i])) {
+ return;
+ }
+ }
+ printf(" \"%.*s\"", len, data);
+}
+
+static void print_edns_client_subnet(const uint8_t *data, uint16_t len)
+{
+ knot_edns_client_subnet_t ecs = { 0 };
+ int ret = knot_edns_client_subnet_parse(&ecs, data, len);
+ if (ret != KNOT_EOK) {
+ return;
+ }
+
+ struct sockaddr_storage addr = { 0 };
+ ret = knot_edns_client_subnet_get_addr(&addr, &ecs);
+ assert(ret == KNOT_EOK);
+
+ char addr_str[SOCKADDR_STRLEN] = { 0 };
+ sockaddr_tostr(addr_str, sizeof(addr_str), (struct sockaddr *)&addr);
+
+ printf("%s/%u/%u", addr_str, ecs.source_len, ecs.scope_len);
+}
+
+static void print_section_opt(const knot_pkt_t *packet)
+{
+ char unknown_ercode[64] = "";
+ const char *ercode_str = NULL;
+
+ uint16_t ercode = knot_edns_get_ext_rcode(packet->opt_rr);
+ if (ercode > 0) {
+ ercode = knot_edns_whole_rcode(ercode,
+ knot_wire_get_rcode(packet->wire));
+ }
+
+ const knot_lookup_t *item = knot_lookup_by_id(knot_rcode_names, ercode);
+ if (item != NULL) {
+ ercode_str = item->name;
+ } else {
+ (void)snprintf(unknown_ercode, sizeof(unknown_ercode), "RCODE %d", ercode);
+ ercode_str = unknown_ercode;
+ }
+
+ printf("Version: %u; flags: %s; UDP size: %u B; ext-rcode: %s\n",
+ knot_edns_get_version(packet->opt_rr),
+ (knot_edns_do(packet->opt_rr) != 0) ? "do" : "",
+ knot_edns_get_payload(packet->opt_rr),
+ ercode_str);
+
+ assert(packet->opt_rr->rrs.count > 0);
+ knot_rdata_t *rdata = packet->opt_rr->rrs.rdata;
+ wire_ctx_t wire = wire_ctx_init_const(rdata->data, rdata->len);
+
+ while (wire_ctx_available(&wire) >= KNOT_EDNS_OPTION_HDRLEN) {
+ uint16_t opt_code = wire_ctx_read_u16(&wire);
+ uint16_t opt_len = wire_ctx_read_u16(&wire);
+ uint8_t *opt_data = wire.position;
+
+ if (wire.error != KNOT_EOK) {
+ WARN("invalid OPT record data\n");
+ return;
+ }
+
+ switch (opt_code) {
+ case KNOT_EDNS_OPTION_NSID:
+ printf(";; NSID: ");
+ print_nsid(opt_data, opt_len);
+ break;
+ case KNOT_EDNS_OPTION_CLIENT_SUBNET:
+ printf(";; CLIENT-SUBNET: ");
+ print_edns_client_subnet(opt_data, opt_len);
+ break;
+ case KNOT_EDNS_OPTION_PADDING:
+ printf(";; PADDING: %u B", opt_len);
+ break;
+ case KNOT_EDNS_OPTION_COOKIE:
+ printf(";; COOKIE: ");
+ print_hex(opt_data, opt_len);
+ break;
+ default:
+ printf(";; Option (%u): ", opt_code);
+ print_hex(opt_data, opt_len);
+ }
+ printf("\n");
+
+ wire_ctx_skip(&wire, opt_len);
+ }
+
+ if (wire_ctx_available(&wire) > 0) {
+ WARN("invalid OPT record data\n");
+ }
+}
+
+static void print_section_question(const knot_dname_t *owner,
+ const uint16_t qclass,
+ const uint16_t qtype,
+ const style_t *style)
+{
+ size_t buflen = 8192;
+ char *buf = calloc(buflen, 1);
+
+ // Don't print zero TTL.
+ knot_dump_style_t qstyle = style->style;
+ qstyle.empty_ttl = true;
+
+ knot_rrset_t *question = knot_rrset_new(owner, qtype, qclass, 0, NULL);
+
+ if (knot_rrset_txt_dump_header(question, 0, buf, buflen, &qstyle) < 0) {
+ WARN("can't print whole question section\n");
+ }
+
+ printf("%s\n", buf);
+
+ knot_rrset_free(question, NULL);
+ free(buf);
+}
+
+static void print_section_full(const knot_rrset_t *rrsets,
+ const uint16_t count,
+ const style_t *style,
+ const bool no_tsig)
+{
+ size_t buflen = 8192;
+ char *buf = calloc(buflen, 1);
+
+ for (size_t i = 0; i < count; i++) {
+ // Ignore OPT records.
+ if (rrsets[i].type == KNOT_RRTYPE_OPT) {
+ continue;
+ }
+
+ // Exclude TSIG record.
+ if (no_tsig && rrsets[i].type == KNOT_RRTYPE_TSIG) {
+ continue;
+ }
+
+ if (knot_rrset_txt_dump(&rrsets[i], &buf, &buflen,
+ &(style->style)) < 0) {
+ WARN("can't print whole section\n");
+ break;
+ }
+ printf("%s", buf);
+ }
+
+ free(buf);
+}
+
+static void print_section_dig(const knot_rrset_t *rrsets,
+ const uint16_t count,
+ const style_t *style)
+{
+ size_t buflen = 8192;
+ char *buf = calloc(buflen, 1);
+
+ for (size_t i = 0; i < count; i++) {
+ const knot_rrset_t *rrset = &rrsets[i];
+ uint16_t rrset_rdata_count = rrset->rrs.count;
+ for (uint16_t j = 0; j < rrset_rdata_count; j++) {
+ while (knot_rrset_txt_dump_data(rrset, j, buf, buflen,
+ &(style->style)) < 0) {
+ buflen += 4096;
+ // Oversize protection.
+ if (buflen > 100000) {
+ WARN("can't print whole section\n");
+ break;
+ }
+
+ char *newbuf = realloc(buf, buflen);
+ if (newbuf == NULL) {
+ WARN("can't print whole section\n");
+ break;
+ }
+ buf = newbuf;
+ }
+ printf("%s\n", buf);
+ }
+ }
+
+ free(buf);
+}
+
+static void print_section_host(const knot_rrset_t *rrsets,
+ const uint16_t count,
+ const style_t *style)
+{
+ size_t buflen = 8192;
+ char *buf = calloc(buflen, 1);
+
+ for (size_t i = 0; i < count; i++) {
+ const knot_rrset_t *rrset = &rrsets[i];
+ const knot_lookup_t *descr;
+ char type[32] = "NULL";
+ char *owner;
+
+ owner = knot_dname_to_str_alloc(rrset->owner);
+ if (style->style.ascii_to_idn != NULL) {
+ style->style.ascii_to_idn(&owner);
+ }
+ descr = knot_lookup_by_id(rtypes, rrset->type);
+
+ uint16_t rrset_rdata_count = rrset->rrs.count;
+ for (uint16_t j = 0; j < rrset_rdata_count; j++) {
+ if (rrset->type == KNOT_RRTYPE_CNAME &&
+ style->hide_cname) {
+ continue;
+ }
+
+ while (knot_rrset_txt_dump_data(rrset, j, buf, buflen,
+ &(style->style)) < 0) {
+ buflen += 4096;
+ // Oversize protection.
+ if (buflen > 100000) {
+ WARN("can't print whole section\n");
+ break;
+ }
+
+ char *newbuf = realloc(buf, buflen);
+ if (newbuf == NULL) {
+ WARN("can't print whole section\n");
+ break;
+ }
+ buf = newbuf;
+ }
+
+ if (descr != NULL) {
+ printf("%s %s %s\n", owner, descr->name, buf);
+ } else {
+ knot_rrtype_to_string(rrset->type, type,
+ sizeof(type));
+ printf("%s has %s record %s\n",
+ owner, type, buf);
+ }
+ }
+
+ free(owner);
+ }
+
+ free(buf);
+}
+
+static void print_error_host(const knot_pkt_t *packet, const style_t *style)
+{
+ char type[32] = "Unknown";
+ const char *rcode_str = "Unknown";
+
+ knot_rrtype_to_string(knot_pkt_qtype(packet), type, sizeof(type));
+
+ // Get extended RCODE.
+ const char *code_name = knot_pkt_ext_rcode_name(packet);
+ if (code_name[0] != '\0') {
+ rcode_str = code_name;
+ }
+
+ // Get record owner.
+ char *owner = knot_dname_to_str_alloc(knot_pkt_qname(packet));
+ if (style->style.ascii_to_idn != NULL) {
+ style->style.ascii_to_idn(&owner);
+ }
+
+ if (knot_pkt_ext_rcode(packet) == KNOT_RCODE_NOERROR) {
+ printf("Host %s has no %s record\n", owner, type);
+ } else {
+ printf("Host %s type %s error: %s\n", owner, type, rcode_str);
+ }
+
+ free(owner);
+}
+
+knot_pkt_t *create_empty_packet(const uint16_t max_size)
+{
+ // Create packet skeleton.
+ knot_pkt_t *packet = knot_pkt_new(NULL, max_size, NULL);
+ if (packet == NULL) {
+ DBG_NULL;
+ return NULL;
+ }
+
+ // Set random sequence id.
+ knot_wire_set_id(packet->wire, dnssec_random_uint16_t());
+
+ return packet;
+}
+
+void print_header_xfr(const knot_pkt_t *packet, const style_t *style)
+{
+ if (style == NULL) {
+ DBG_NULL;
+ return;
+ }
+
+ char xfr[16] = "AXFR";
+
+ switch (knot_pkt_qtype(packet)) {
+ case KNOT_RRTYPE_AXFR:
+ break;
+ case KNOT_RRTYPE_IXFR:
+ xfr[0] = 'I';
+ break;
+ default:
+ return;
+ }
+
+ if (style->show_header) {
+ char *owner = knot_dname_to_str_alloc(knot_pkt_qname(packet));
+ if (style->style.ascii_to_idn != NULL) {
+ style->style.ascii_to_idn(&owner);
+ }
+ if (owner != NULL) {
+ printf(";; %s for %s\n", xfr, owner);
+ free(owner);
+ }
+ }
+}
+
+void print_data_xfr(const knot_pkt_t *packet,
+ const style_t *style)
+{
+ if (packet == NULL || style == NULL) {
+ DBG_NULL;
+ return;
+ }
+
+ const knot_pktsection_t *answers = knot_pkt_section(packet, KNOT_ANSWER);
+
+ switch (style->format) {
+ case FORMAT_DIG:
+ print_section_dig(knot_pkt_rr(answers, 0), answers->count, style);
+ break;
+ case FORMAT_HOST:
+ print_section_host(knot_pkt_rr(answers, 0), answers->count, style);
+ break;
+ case FORMAT_FULL:
+ print_section_full(knot_pkt_rr(answers, 0), answers->count, style, true);
+
+ // Print TSIG record.
+ if (style->show_tsig && knot_pkt_has_tsig(packet)) {
+ print_section_full(packet->tsig_rr, 1, style, false);
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+void print_footer_xfr(const size_t total_len,
+ const size_t msg_count,
+ const size_t rr_count,
+ const net_t *net,
+ const float elapsed,
+ const time_t exec_time,
+ const style_t *style)
+{
+ if (style == NULL) {
+ DBG_NULL;
+ return;
+ }
+
+ if (style->show_footer) {
+ print_footer(total_len, msg_count, rr_count, net, elapsed,
+ exec_time, true);
+ }
+}
+
+void print_packet(const knot_pkt_t *packet,
+ const net_t *net,
+ const size_t size,
+ const float elapsed,
+ const time_t exec_time,
+ const bool incoming,
+ const style_t *style)
+{
+ if (packet == NULL || style == NULL) {
+ DBG_NULL;
+ return;
+ }
+
+ const knot_pktsection_t *answers = knot_pkt_section(packet,
+ KNOT_ANSWER);
+ const knot_pktsection_t *authority = knot_pkt_section(packet,
+ KNOT_AUTHORITY);
+ const knot_pktsection_t *additional = knot_pkt_section(packet,
+ KNOT_ADDITIONAL);
+
+ uint16_t qdcount = knot_wire_get_qdcount(packet->wire);
+ uint16_t ancount = knot_wire_get_ancount(packet->wire);
+ uint16_t nscount = knot_wire_get_nscount(packet->wire);
+ uint16_t arcount = knot_wire_get_arcount(packet->wire);
+
+ // Disable additionals printing if there are no other records.
+ // OPT record may be placed anywhere within additionals!
+ if (knot_pkt_has_edns(packet) && arcount == 1) {
+ arcount = 0;
+ }
+
+ // Print packet information header.
+ if (style->show_header) {
+ if (net != NULL) {
+ print_tls(&net->tls);
+ }
+ print_header(packet, style);
+ }
+
+ // Print EDNS section.
+ if (style->show_edns && knot_pkt_has_edns(packet)) {
+ printf("%s", style->show_section ? "\n;; EDNS PSEUDOSECTION:\n;; " : ";;");
+ print_section_opt(packet);
+ }
+
+ // Print DNS sections.
+ switch (style->format) {
+ case FORMAT_DIG:
+ if (ancount > 0) {
+ print_section_dig(knot_pkt_rr(answers, 0), ancount, style);
+ }
+ break;
+ case FORMAT_HOST:
+ if (ancount > 0) {
+ print_section_host(knot_pkt_rr(answers, 0), ancount, style);
+ } else {
+ print_error_host(packet, style);
+ }
+ break;
+ case FORMAT_NSUPDATE:
+ if (style->show_question && qdcount > 0) {
+ printf("%s", style->show_section ? "\n;; ZONE SECTION:\n;; " : ";;");
+ print_section_question(knot_pkt_qname(packet),
+ knot_pkt_qclass(packet),
+ knot_pkt_qtype(packet),
+ style);
+ }
+
+ if (style->show_answer && ancount > 0) {
+ printf("%s", style->show_section ? "\n;; PREREQUISITE SECTION:\n" : "");
+ print_section_full(knot_pkt_rr(answers, 0), ancount, style, true);
+ }
+
+ if (style->show_authority && nscount > 0) {
+ printf("%s", style->show_section ? "\n;; UPDATE SECTION:\n" : "");
+ print_section_full(knot_pkt_rr(authority, 0), nscount, style, true);
+ }
+
+ if (style->show_additional && arcount > 0) {
+ printf("%s", style->show_section ? "\n;; ADDITIONAL DATA:\n" : "");
+ print_section_full(knot_pkt_rr(additional, 0), arcount, style, true);
+ }
+ break;
+ case FORMAT_FULL:
+ if (style->show_question && qdcount > 0) {
+ printf("%s", style->show_section ? "\n;; QUESTION SECTION:\n;; " : ";;");
+ print_section_question(knot_pkt_qname(packet),
+ knot_pkt_qclass(packet),
+ knot_pkt_qtype(packet),
+ style);
+ }
+
+ if (style->show_answer && ancount > 0) {
+ printf("%s", style->show_section ? "\n;; ANSWER SECTION:\n" : "");
+ print_section_full(knot_pkt_rr(answers, 0), ancount, style, true);
+ }
+
+ if (style->show_authority && nscount > 0) {
+ printf("%s", style->show_section ? "\n;; AUTHORITY SECTION:\n" : "");
+ print_section_full(knot_pkt_rr(authority, 0), nscount, style, true);
+ }
+
+ if (style->show_additional && arcount > 0) {
+ printf("%s", style->show_section ? "\n;; ADDITIONAL SECTION:\n" : "");
+ print_section_full(knot_pkt_rr(additional, 0), arcount, style, true);
+ }
+ break;
+ default:
+ break;
+ }
+
+ // Print TSIG section.
+ if (style->show_tsig && knot_pkt_has_tsig(packet)) {
+ printf("%s", style->show_section ? "\n;; TSIG PSEUDOSECTION:\n" : "");
+ print_section_full(packet->tsig_rr, 1, style, false);
+ }
+
+ // Print packet statistics.
+ if (style->show_footer) {
+ printf("\n");
+ print_footer(size, 0, 0, net, elapsed, exec_time, incoming);
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 12:13:43 +0000