/* $NetBSD: wire_test.c,v 1.7.2.2 2024/02/25 15:43:13 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. * * See the COPYRIGHT file distributed with this work for additional * information regarding copyright ownership. */ #include #include #include #include #include #include #include #include #include #include #include #include int parseflags = 0; isc_mem_t *mctx = NULL; bool printmemstats = false; bool dorender = false; static void process_message(isc_buffer_t *source); static isc_result_t printmessage(dns_message_t *msg); static void CHECKRESULT(isc_result_t result, const char *msg) { if (result != ISC_R_SUCCESS) { printf("%s: %s\n", msg, isc_result_totext(result)); exit(1); } } static int fromhex(char c) { if (c >= '0' && c <= '9') { return (c - '0'); } else if (c >= 'a' && c <= 'f') { return (c - 'a' + 10); } else if (c >= 'A' && c <= 'F') { return (c - 'A' + 10); } fprintf(stderr, "bad input format: %02x\n", c); exit(3); } static void usage(void) { fprintf(stderr, "wire_test [-b] [-d] [-p] [-r] [-s]\n"); fprintf(stderr, " [-m {usage|trace|record|size|mctx}]\n"); fprintf(stderr, " [filename]\n\n"); fprintf(stderr, "\t-b\tBest-effort parsing (ignore some errors)\n"); fprintf(stderr, "\t-d\tRead input as raw binary data\n"); fprintf(stderr, "\t-p\tPreserve order of the records in messages\n"); fprintf(stderr, "\t-r\tAfter parsing, re-render the message\n"); fprintf(stderr, "\t-s\tPrint memory statistics\n"); fprintf(stderr, "\t-t\tTCP mode - ignore the first 2 bytes\n"); } static isc_result_t printmessage(dns_message_t *msg) { isc_buffer_t b; char *buf = NULL; int len = 1024; isc_result_t result = ISC_R_SUCCESS; do { buf = isc_mem_get(mctx, len); isc_buffer_init(&b, buf, len); result = dns_message_totext(msg, &dns_master_style_debug, 0, &b); if (result == ISC_R_NOSPACE) { isc_mem_put(mctx, buf, len); len *= 2; } else if (result == ISC_R_SUCCESS) { printf("%.*s\n", (int)isc_buffer_usedlength(&b), buf); } } while (result == ISC_R_NOSPACE); if (buf != NULL) { isc_mem_put(mctx, buf, len); } return (result); } int main(int argc, char *argv[]) { isc_buffer_t *input = NULL; bool need_close = false; bool tcp = false; bool rawdata = false; isc_result_t result; uint8_t c; FILE *f; int ch; #define CMDLINE_FLAGS "bdm:prst" /* * Process memory debugging argument first. */ while ((ch = isc_commandline_parse(argc, argv, CMDLINE_FLAGS)) != -1) { switch (ch) { case 'm': if (strcasecmp(isc_commandline_argument, "record") == 0) { isc_mem_debugging |= ISC_MEM_DEBUGRECORD; } if (strcasecmp(isc_commandline_argument, "trace") == 0) { isc_mem_debugging |= ISC_MEM_DEBUGTRACE; } if (strcasecmp(isc_commandline_argument, "usage") == 0) { isc_mem_debugging |= ISC_MEM_DEBUGUSAGE; } break; default: break; } } isc_commandline_reset = true; isc_mem_create(&mctx); while ((ch = isc_commandline_parse(argc, argv, CMDLINE_FLAGS)) != -1) { switch (ch) { case 'b': parseflags |= DNS_MESSAGEPARSE_BESTEFFORT; break; case 'd': rawdata = true; break; case 'm': break; case 'p': parseflags |= DNS_MESSAGEPARSE_PRESERVEORDER; break; case 'r': dorender = true; break; case 's': printmemstats = true; break; case 't': tcp = true; break; default: usage(); exit(1); } } argc -= isc_commandline_index; argv += isc_commandline_index; if (argc >= 1) { f = fopen(argv[0], "r"); if (f == NULL) { fprintf(stderr, "%s: fopen failed\n", argv[0]); exit(1); } need_close = true; } else { f = stdin; } isc_buffer_allocate(mctx, &input, 64 * 1024); if (rawdata) { while (fread(&c, 1, 1, f) != 0) { result = isc_buffer_reserve(&input, 1); RUNTIME_CHECK(result == ISC_R_SUCCESS); isc_buffer_putuint8(input, (uint8_t)c); } } else { char s[BUFSIZ]; while (fgets(s, sizeof(s), f) != NULL) { char *rp = s, *wp = s; size_t i, len = 0; while (*rp != '\0') { if (*rp == '#') { break; } if (*rp != ' ' && *rp != '\t' && *rp != '\r' && *rp != '\n') { *wp++ = *rp; len++; } rp++; } if (len == 0U) { continue; } if (len % 2 != 0U) { fprintf(stderr, "bad input format: %lu\n", (unsigned long)len); exit(1); } rp = s; for (i = 0; i < len; i += 2) { c = fromhex(*rp++); c *= 16; c += fromhex(*rp++); result = isc_buffer_reserve(&input, 1); RUNTIME_CHECK(result == ISC_R_SUCCESS); isc_buffer_putuint8(input, (uint8_t)c); } } } if (need_close) { fclose(f); } if (tcp) { while (isc_buffer_remaininglength(input) != 0) { unsigned int tcplen; if (isc_buffer_remaininglength(input) < 2) { fprintf(stderr, "premature end of packet\n"); exit(1); } tcplen = isc_buffer_getuint16(input); if (isc_buffer_remaininglength(input) < tcplen) { fprintf(stderr, "premature end of packet\n"); exit(1); } process_message(input); } } else { process_message(input); } isc_buffer_free(&input); if (printmemstats) { isc_mem_stats(mctx, stdout); } isc_mem_destroy(&mctx); return (0); } static void process_message(isc_buffer_t *source) { dns_message_t *message; isc_result_t result; int i; message = NULL; dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &message); result = dns_message_parse(message, source, parseflags); if (result == DNS_R_RECOVERABLE) { result = ISC_R_SUCCESS; } CHECKRESULT(result, "dns_message_parse failed"); result = printmessage(message); CHECKRESULT(result, "printmessage() failed"); if (printmemstats) { isc_mem_stats(mctx, stdout); } if (dorender) { unsigned char b2[65535]; isc_buffer_t buffer; dns_compress_t cctx; isc_buffer_init(&buffer, b2, sizeof(b2)); /* * XXXMLG * Changing this here is a hack, and should not be done in * reasonable application code, ever. */ message->from_to_wire = DNS_MESSAGE_INTENTRENDER; for (i = 0; i < DNS_SECTION_MAX; i++) { message->counts[i] = 0; /* Another hack XXX */ } result = dns_compress_init(&cctx, -1, mctx); CHECKRESULT(result, "dns_compress_init() failed"); result = dns_message_renderbegin(message, &cctx, &buffer); CHECKRESULT(result, "dns_message_renderbegin() failed"); result = dns_message_rendersection(message, DNS_SECTION_QUESTION, 0); CHECKRESULT(result, "dns_message_rendersection(QUESTION) " "failed"); result = dns_message_rendersection(message, DNS_SECTION_ANSWER, 0); CHECKRESULT(result, "dns_message_rendersection(ANSWER) failed"); result = dns_message_rendersection(message, DNS_SECTION_AUTHORITY, 0); CHECKRESULT(result, "dns_message_rendersection(AUTHORITY) " "failed"); result = dns_message_rendersection(message, DNS_SECTION_ADDITIONAL, 0); CHECKRESULT(result, "dns_message_rendersection(ADDITIONAL) " "failed"); dns_message_renderend(message); dns_compress_invalidate(&cctx); message->from_to_wire = DNS_MESSAGE_INTENTPARSE; dns_message_detach(&message); printf("Message rendered.\n"); if (printmemstats) { isc_mem_stats(mctx, stdout); } dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &message); result = dns_message_parse(message, &buffer, parseflags); CHECKRESULT(result, "dns_message_parse failed"); result = printmessage(message); CHECKRESULT(result, "printmessage() failed"); } dns_message_detach(&message); }