1 /* $NetBSD: wire_test.c,v 1.9 2024/02/21 22:51:13 christos Exp $ */ 2 3 /* 4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC") 5 * 6 * SPDX-License-Identifier: MPL-2.0 7 * 8 * This Source Code Form is subject to the terms of the Mozilla Public 9 * License, v. 2.0. If a copy of the MPL was not distributed with this 10 * file, you can obtain one at https://mozilla.org/MPL/2.0/. 11 * 12 * See the COPYRIGHT file distributed with this work for additional 13 * information regarding copyright ownership. 14 */ 15 16 #include <inttypes.h> 17 #include <stdbool.h> 18 #include <stdlib.h> 19 20 #include <isc/buffer.h> 21 #include <isc/commandline.h> 22 #include <isc/file.h> 23 #include <isc/mem.h> 24 #include <isc/print.h> 25 #include <isc/result.h> 26 #include <isc/string.h> 27 #include <isc/util.h> 28 29 #include <dns/message.h> 30 31 int parseflags = 0; 32 isc_mem_t *mctx = NULL; 33 bool printmemstats = false; 34 bool dorender = false; 35 36 static void 37 process_message(isc_buffer_t *source); 38 39 static isc_result_t 40 printmessage(dns_message_t *msg); 41 42 static void 43 CHECKRESULT(isc_result_t result, const char *msg) { 44 if (result != ISC_R_SUCCESS) { 45 printf("%s: %s\n", msg, isc_result_totext(result)); 46 47 exit(1); 48 } 49 } 50 51 static int 52 fromhex(char c) { 53 if (c >= '0' && c <= '9') { 54 return (c - '0'); 55 } else if (c >= 'a' && c <= 'f') { 56 return (c - 'a' + 10); 57 } else if (c >= 'A' && c <= 'F') { 58 return (c - 'A' + 10); 59 } 60 61 fprintf(stderr, "bad input format: %02x\n", c); 62 exit(3); 63 } 64 65 static void 66 usage(void) { 67 fprintf(stderr, "wire_test [-b] [-d] [-p] [-r] [-s]\n"); 68 fprintf(stderr, " [-m {usage|trace|record|size|mctx}]\n"); 69 fprintf(stderr, " [filename]\n\n"); 70 fprintf(stderr, "\t-b\tBest-effort parsing (ignore some errors)\n"); 71 fprintf(stderr, "\t-d\tRead input as raw binary data\n"); 72 fprintf(stderr, "\t-p\tPreserve order of the records in messages\n"); 73 fprintf(stderr, "\t-r\tAfter parsing, re-render the message\n"); 74 fprintf(stderr, "\t-s\tPrint memory statistics\n"); 75 fprintf(stderr, "\t-t\tTCP mode - ignore the first 2 bytes\n"); 76 } 77 78 static isc_result_t 79 printmessage(dns_message_t *msg) { 80 isc_buffer_t b; 81 char *buf = NULL; 82 int len = 1024; 83 isc_result_t result = ISC_R_SUCCESS; 84 85 do { 86 buf = isc_mem_get(mctx, len); 87 88 isc_buffer_init(&b, buf, len); 89 result = dns_message_totext(msg, &dns_master_style_debug, 0, 90 &b); 91 if (result == ISC_R_NOSPACE) { 92 isc_mem_put(mctx, buf, len); 93 len *= 2; 94 } else if (result == ISC_R_SUCCESS) { 95 printf("%.*s\n", (int)isc_buffer_usedlength(&b), buf); 96 } 97 } while (result == ISC_R_NOSPACE); 98 99 if (buf != NULL) { 100 isc_mem_put(mctx, buf, len); 101 } 102 103 return (result); 104 } 105 106 int 107 main(int argc, char *argv[]) { 108 isc_buffer_t *input = NULL; 109 bool need_close = false; 110 bool tcp = false; 111 bool rawdata = false; 112 isc_result_t result; 113 uint8_t c; 114 FILE *f; 115 int ch; 116 117 #define CMDLINE_FLAGS "bdm:prst" 118 /* 119 * Process memory debugging argument first. 120 */ 121 while ((ch = isc_commandline_parse(argc, argv, CMDLINE_FLAGS)) != -1) { 122 switch (ch) { 123 case 'm': 124 if (strcasecmp(isc_commandline_argument, "record") == 0) 125 { 126 isc_mem_debugging |= ISC_MEM_DEBUGRECORD; 127 } 128 if (strcasecmp(isc_commandline_argument, "trace") == 0) 129 { 130 isc_mem_debugging |= ISC_MEM_DEBUGTRACE; 131 } 132 if (strcasecmp(isc_commandline_argument, "usage") == 0) 133 { 134 isc_mem_debugging |= ISC_MEM_DEBUGUSAGE; 135 } 136 break; 137 default: 138 break; 139 } 140 } 141 isc_commandline_reset = true; 142 143 isc_mem_create(&mctx); 144 145 while ((ch = isc_commandline_parse(argc, argv, CMDLINE_FLAGS)) != -1) { 146 switch (ch) { 147 case 'b': 148 parseflags |= DNS_MESSAGEPARSE_BESTEFFORT; 149 break; 150 case 'd': 151 rawdata = true; 152 break; 153 case 'm': 154 break; 155 case 'p': 156 parseflags |= DNS_MESSAGEPARSE_PRESERVEORDER; 157 break; 158 case 'r': 159 dorender = true; 160 break; 161 case 's': 162 printmemstats = true; 163 break; 164 case 't': 165 tcp = true; 166 break; 167 default: 168 usage(); 169 exit(1); 170 } 171 } 172 173 argc -= isc_commandline_index; 174 argv += isc_commandline_index; 175 176 if (argc >= 1) { 177 f = fopen(argv[0], "r"); 178 if (f == NULL) { 179 fprintf(stderr, "%s: fopen failed\n", argv[0]); 180 exit(1); 181 } 182 need_close = true; 183 } else { 184 f = stdin; 185 } 186 187 isc_buffer_allocate(mctx, &input, 64 * 1024); 188 189 if (rawdata) { 190 while (fread(&c, 1, 1, f) != 0) { 191 result = isc_buffer_reserve(&input, 1); 192 RUNTIME_CHECK(result == ISC_R_SUCCESS); 193 isc_buffer_putuint8(input, (uint8_t)c); 194 } 195 } else { 196 char s[BUFSIZ]; 197 198 while (fgets(s, sizeof(s), f) != NULL) { 199 char *rp = s, *wp = s; 200 size_t i, len = 0; 201 202 while (*rp != '\0') { 203 if (*rp == '#') { 204 break; 205 } 206 if (*rp != ' ' && *rp != '\t' && *rp != '\r' && 207 *rp != '\n') 208 { 209 *wp++ = *rp; 210 len++; 211 } 212 rp++; 213 } 214 if (len == 0U) { 215 continue; 216 } 217 if (len % 2 != 0U) { 218 fprintf(stderr, "bad input format: %lu\n", 219 (unsigned long)len); 220 exit(1); 221 } 222 223 rp = s; 224 for (i = 0; i < len; i += 2) { 225 c = fromhex(*rp++); 226 c *= 16; 227 c += fromhex(*rp++); 228 result = isc_buffer_reserve(&input, 1); 229 RUNTIME_CHECK(result == ISC_R_SUCCESS); 230 isc_buffer_putuint8(input, (uint8_t)c); 231 } 232 } 233 } 234 235 if (need_close) { 236 fclose(f); 237 } 238 239 if (tcp) { 240 while (isc_buffer_remaininglength(input) != 0) { 241 unsigned int tcplen; 242 243 if (isc_buffer_remaininglength(input) < 2) { 244 fprintf(stderr, "premature end of packet\n"); 245 exit(1); 246 } 247 tcplen = isc_buffer_getuint16(input); 248 249 if (isc_buffer_remaininglength(input) < tcplen) { 250 fprintf(stderr, "premature end of packet\n"); 251 exit(1); 252 } 253 process_message(input); 254 } 255 } else { 256 process_message(input); 257 } 258 259 isc_buffer_free(&input); 260 261 if (printmemstats) { 262 isc_mem_stats(mctx, stdout); 263 } 264 isc_mem_destroy(&mctx); 265 266 return (0); 267 } 268 269 static void 270 process_message(isc_buffer_t *source) { 271 dns_message_t *message; 272 isc_result_t result; 273 int i; 274 275 message = NULL; 276 dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &message); 277 278 result = dns_message_parse(message, source, parseflags); 279 if (result == DNS_R_RECOVERABLE) { 280 result = ISC_R_SUCCESS; 281 } 282 CHECKRESULT(result, "dns_message_parse failed"); 283 284 result = printmessage(message); 285 CHECKRESULT(result, "printmessage() failed"); 286 287 if (printmemstats) { 288 isc_mem_stats(mctx, stdout); 289 } 290 291 if (dorender) { 292 unsigned char b2[65535]; 293 isc_buffer_t buffer; 294 dns_compress_t cctx; 295 296 isc_buffer_init(&buffer, b2, sizeof(b2)); 297 298 /* 299 * XXXMLG 300 * Changing this here is a hack, and should not be done in 301 * reasonable application code, ever. 302 */ 303 message->from_to_wire = DNS_MESSAGE_INTENTRENDER; 304 305 for (i = 0; i < DNS_SECTION_MAX; i++) { 306 message->counts[i] = 0; /* Another hack XXX */ 307 } 308 309 result = dns_compress_init(&cctx, -1, mctx); 310 CHECKRESULT(result, "dns_compress_init() failed"); 311 312 result = dns_message_renderbegin(message, &cctx, &buffer); 313 CHECKRESULT(result, "dns_message_renderbegin() failed"); 314 315 result = dns_message_rendersection(message, 316 DNS_SECTION_QUESTION, 0); 317 CHECKRESULT(result, "dns_message_rendersection(QUESTION) " 318 "failed"); 319 320 result = dns_message_rendersection(message, DNS_SECTION_ANSWER, 321 0); 322 CHECKRESULT(result, "dns_message_rendersection(ANSWER) failed"); 323 324 result = dns_message_rendersection(message, 325 DNS_SECTION_AUTHORITY, 0); 326 CHECKRESULT(result, "dns_message_rendersection(AUTHORITY) " 327 "failed"); 328 329 result = dns_message_rendersection(message, 330 DNS_SECTION_ADDITIONAL, 0); 331 CHECKRESULT(result, "dns_message_rendersection(ADDITIONAL) " 332 "failed"); 333 334 dns_message_renderend(message); 335 336 dns_compress_invalidate(&cctx); 337 338 message->from_to_wire = DNS_MESSAGE_INTENTPARSE; 339 dns_message_detach(&message); 340 341 printf("Message rendered.\n"); 342 if (printmemstats) { 343 isc_mem_stats(mctx, stdout); 344 } 345 346 dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &message); 347 348 result = dns_message_parse(message, &buffer, parseflags); 349 CHECKRESULT(result, "dns_message_parse failed"); 350 351 result = printmessage(message); 352 CHECKRESULT(result, "printmessage() failed"); 353 } 354 dns_message_detach(&message); 355 } 356