1 /* $NetBSD: wire_test.c,v 1.8 2023/01/25 21:43:24 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/string.h> 26 #include <isc/util.h> 27 28 #include <dns/message.h> 29 #include <dns/result.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, dns_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 if (strcasecmp(isc_commandline_argument, "size") == 0) { 137 isc_mem_debugging |= ISC_MEM_DEBUGSIZE; 138 } 139 if (strcasecmp(isc_commandline_argument, "mctx") == 0) { 140 isc_mem_debugging |= ISC_MEM_DEBUGCTX; 141 } 142 break; 143 default: 144 break; 145 } 146 } 147 isc_commandline_reset = true; 148 149 isc_mem_create(&mctx); 150 151 while ((ch = isc_commandline_parse(argc, argv, CMDLINE_FLAGS)) != -1) { 152 switch (ch) { 153 case 'b': 154 parseflags |= DNS_MESSAGEPARSE_BESTEFFORT; 155 break; 156 case 'd': 157 rawdata = true; 158 break; 159 case 'm': 160 break; 161 case 'p': 162 parseflags |= DNS_MESSAGEPARSE_PRESERVEORDER; 163 break; 164 case 'r': 165 dorender = true; 166 break; 167 case 's': 168 printmemstats = true; 169 break; 170 case 't': 171 tcp = true; 172 break; 173 default: 174 usage(); 175 exit(1); 176 } 177 } 178 179 argc -= isc_commandline_index; 180 argv += isc_commandline_index; 181 182 if (argc >= 1) { 183 f = fopen(argv[0], "r"); 184 if (f == NULL) { 185 fprintf(stderr, "%s: fopen failed\n", argv[0]); 186 exit(1); 187 } 188 need_close = true; 189 } else { 190 f = stdin; 191 } 192 193 isc_buffer_allocate(mctx, &input, 64 * 1024); 194 195 if (rawdata) { 196 while (fread(&c, 1, 1, f) != 0) { 197 result = isc_buffer_reserve(&input, 1); 198 RUNTIME_CHECK(result == ISC_R_SUCCESS); 199 isc_buffer_putuint8(input, (uint8_t)c); 200 } 201 } else { 202 char s[BUFSIZ]; 203 204 while (fgets(s, sizeof(s), f) != NULL) { 205 char *rp = s, *wp = s; 206 size_t i, len = 0; 207 208 while (*rp != '\0') { 209 if (*rp == '#') { 210 break; 211 } 212 if (*rp != ' ' && *rp != '\t' && *rp != '\r' && 213 *rp != '\n') 214 { 215 *wp++ = *rp; 216 len++; 217 } 218 rp++; 219 } 220 if (len == 0U) { 221 continue; 222 } 223 if (len % 2 != 0U) { 224 fprintf(stderr, "bad input format: %lu\n", 225 (unsigned long)len); 226 exit(1); 227 } 228 229 rp = s; 230 for (i = 0; i < len; i += 2) { 231 c = fromhex(*rp++); 232 c *= 16; 233 c += fromhex(*rp++); 234 result = isc_buffer_reserve(&input, 1); 235 RUNTIME_CHECK(result == ISC_R_SUCCESS); 236 isc_buffer_putuint8(input, (uint8_t)c); 237 } 238 } 239 } 240 241 if (need_close) { 242 fclose(f); 243 } 244 245 if (tcp) { 246 while (isc_buffer_remaininglength(input) != 0) { 247 unsigned int tcplen; 248 249 if (isc_buffer_remaininglength(input) < 2) { 250 fprintf(stderr, "premature end of packet\n"); 251 exit(1); 252 } 253 tcplen = isc_buffer_getuint16(input); 254 255 if (isc_buffer_remaininglength(input) < tcplen) { 256 fprintf(stderr, "premature end of packet\n"); 257 exit(1); 258 } 259 process_message(input); 260 } 261 } else { 262 process_message(input); 263 } 264 265 isc_buffer_free(&input); 266 267 if (printmemstats) { 268 isc_mem_stats(mctx, stdout); 269 } 270 isc_mem_destroy(&mctx); 271 272 return (0); 273 } 274 275 static void 276 process_message(isc_buffer_t *source) { 277 dns_message_t *message; 278 isc_result_t result; 279 int i; 280 281 message = NULL; 282 dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &message); 283 284 result = dns_message_parse(message, source, parseflags); 285 if (result == DNS_R_RECOVERABLE) { 286 result = ISC_R_SUCCESS; 287 } 288 CHECKRESULT(result, "dns_message_parse failed"); 289 290 result = printmessage(message); 291 CHECKRESULT(result, "printmessage() failed"); 292 293 if (printmemstats) { 294 isc_mem_stats(mctx, stdout); 295 } 296 297 if (dorender) { 298 unsigned char b2[64 * 1024]; 299 isc_buffer_t buffer; 300 dns_compress_t cctx; 301 302 isc_buffer_init(&buffer, b2, sizeof(b2)); 303 304 /* 305 * XXXMLG 306 * Changing this here is a hack, and should not be done in 307 * reasonable application code, ever. 308 */ 309 message->from_to_wire = DNS_MESSAGE_INTENTRENDER; 310 311 for (i = 0; i < DNS_SECTION_MAX; i++) { 312 message->counts[i] = 0; /* Another hack XXX */ 313 } 314 315 result = dns_compress_init(&cctx, -1, mctx); 316 CHECKRESULT(result, "dns_compress_init() failed"); 317 318 result = dns_message_renderbegin(message, &cctx, &buffer); 319 CHECKRESULT(result, "dns_message_renderbegin() failed"); 320 321 result = dns_message_rendersection(message, 322 DNS_SECTION_QUESTION, 0); 323 CHECKRESULT(result, "dns_message_rendersection(QUESTION) " 324 "failed"); 325 326 result = dns_message_rendersection(message, DNS_SECTION_ANSWER, 327 0); 328 CHECKRESULT(result, "dns_message_rendersection(ANSWER) failed"); 329 330 result = dns_message_rendersection(message, 331 DNS_SECTION_AUTHORITY, 0); 332 CHECKRESULT(result, "dns_message_rendersection(AUTHORITY) " 333 "failed"); 334 335 result = dns_message_rendersection(message, 336 DNS_SECTION_ADDITIONAL, 0); 337 CHECKRESULT(result, "dns_message_rendersection(ADDITIONAL) " 338 "failed"); 339 340 dns_message_renderend(message); 341 342 dns_compress_invalidate(&cctx); 343 344 message->from_to_wire = DNS_MESSAGE_INTENTPARSE; 345 dns_message_detach(&message); 346 347 printf("Message rendered.\n"); 348 if (printmemstats) { 349 isc_mem_stats(mctx, stdout); 350 } 351 352 dns_message_create(mctx, DNS_MESSAGE_INTENTPARSE, &message); 353 354 result = dns_message_parse(message, &buffer, parseflags); 355 CHECKRESULT(result, "dns_message_parse failed"); 356 357 result = printmessage(message); 358 CHECKRESULT(result, "printmessage() failed"); 359 } 360 dns_message_detach(&message); 361 } 362