Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 1 | /* |
| 2 | * This is a generic BER decoder template for any ASN.1 type. |
| 3 | * |
Lev Walkin | c490ff8 | 2005-03-10 11:59:44 +0000 | [diff] [blame] | 4 | * To compile with your own ASN.1 type, please redefine the asn_DEF as shown: |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 5 | * |
Lev Walkin | c490ff8 | 2005-03-10 11:59:44 +0000 | [diff] [blame] | 6 | * cc -Dasn_DEF=asn_DEF_MyCustomType -o myDecoder.o -c asn-decoder-template.c |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 7 | */ |
| 8 | #ifdef HAVE_CONFIG_H |
| 9 | #include <config.h> |
| 10 | #endif |
| 11 | #include <stdio.h> |
| 12 | #include <sys/types.h> |
| 13 | #include <unistd.h> /* for getopt */ |
| 14 | #include <string.h> /* for strerror(3) */ |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 15 | #include <sysexits.h> /* for EX_* exit codes */ |
Lev Walkin | fc77643 | 2005-03-29 17:21:14 +0000 | [diff] [blame] | 16 | #include <assert.h> /* for assert(3) */ |
| 17 | #include <errno.h> /* for errno */ |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 18 | |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 19 | #include <asn_application.h> |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 20 | |
| 21 | extern asn_TYPE_descriptor_t asn_DEF; /* ASN.1 type to be decoded */ |
| 22 | |
| 23 | /* |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 24 | * Open file and parse its contens. |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 25 | */ |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 26 | static void *data_decode_from_file(asn_TYPE_descriptor_t *asnTypeOfPDU, |
| 27 | const char *fname, ssize_t suggested_bufsize); |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 28 | |
| 29 | int opt_debug; /* -d */ |
| 30 | static int opt_check; /* -c */ |
| 31 | static int opt_print; /* -p */ |
| 32 | static int opt_stack; /* -s */ |
| 33 | static int opt_toxml; /* -x */ |
| 34 | |
| 35 | #define DEBUG(fmt, args...) do { \ |
| 36 | if(!opt_debug) break; \ |
| 37 | fprintf(stderr, fmt, ##args); \ |
| 38 | fprintf(stderr, "\n"); \ |
| 39 | } while(0) |
| 40 | |
| 41 | int |
| 42 | main(int ac, char **av) { |
| 43 | ssize_t suggested_bufsize = 8192; /* close or equal to stdio buffer */ |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 44 | asn_TYPE_descriptor_t *pduType = &asn_DEF; |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 45 | int number_of_iterations = 1; |
| 46 | int num; |
| 47 | int ch; |
| 48 | |
| 49 | /* |
| 50 | * Pocess the command-line argments. |
| 51 | */ |
| 52 | while((ch = getopt(ac, av, "b:cdn:hps:x")) != -1) |
| 53 | switch(ch) { |
| 54 | case 'b': |
| 55 | suggested_bufsize = atoi(optarg); |
| 56 | if(suggested_bufsize < 1 |
| 57 | || suggested_bufsize > 16 * 1024 * 1024) { |
| 58 | fprintf(stderr, |
| 59 | "-b %s: Improper buffer size (1..16M)\n", |
| 60 | optarg); |
| 61 | exit(EX_UNAVAILABLE); |
| 62 | } |
| 63 | break; |
| 64 | case 'c': |
| 65 | opt_check = 1; |
| 66 | break; |
| 67 | case 'd': |
| 68 | opt_debug++; /* Double -dd means ASN.1 debug */ |
| 69 | break; |
| 70 | case 'n': |
| 71 | number_of_iterations = atoi(optarg); |
| 72 | if(number_of_iterations < 1) { |
| 73 | fprintf(stderr, |
| 74 | "-n %s: Improper iterations count\n", optarg); |
| 75 | exit(EX_UNAVAILABLE); |
| 76 | } |
| 77 | break; |
| 78 | case 'p': |
Lev Walkin | 5ba113b | 2005-04-08 19:28:18 +0000 | [diff] [blame^] | 79 | opt_toxml = 0; /* Override '-x' */ |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 80 | opt_print++; |
| 81 | break; |
| 82 | case 's': |
| 83 | opt_stack = atoi(optarg); |
| 84 | if(opt_stack <= 0) { |
| 85 | fprintf(stderr, |
| 86 | "-s %s: Value greater than 0 expected\n", |
| 87 | optarg); |
| 88 | exit(EX_UNAVAILABLE); |
| 89 | } |
| 90 | break; |
| 91 | case 'x': |
Lev Walkin | 5ba113b | 2005-04-08 19:28:18 +0000 | [diff] [blame^] | 92 | opt_print = 0; /* Override '-p' */ |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 93 | opt_toxml++; |
| 94 | break; |
| 95 | case 'h': |
| 96 | default: |
| 97 | fprintf(stderr, |
| 98 | "Usage: %s [options] <data.ber> ...\n" |
| 99 | "Where options are:\n" |
| 100 | " -b <size> Set the i/o buffer size (default is %ld)\n" |
| 101 | " -c Check ASN.1 constraints after decoding\n" |
| 102 | " -d Enable debugging (-dd is even better)\n" |
| 103 | " -n <num> Process files <num> times\n" |
| 104 | " -s <size> Set the stack usage limit\n" |
| 105 | " -p Print out the decoded contents\n" |
Lev Walkin | 5ba113b | 2005-04-08 19:28:18 +0000 | [diff] [blame^] | 106 | " -x Print out as XML" |
| 107 | #ifdef ASN_DECODER_DEFAULT_OUTPUT_XML |
| 108 | " (default)" |
| 109 | #endif |
| 110 | "\n" |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 111 | , av[0], (long)suggested_bufsize); |
| 112 | exit(EX_USAGE); |
| 113 | } |
| 114 | |
| 115 | ac -= optind; |
| 116 | av += optind; |
| 117 | |
| 118 | if(ac < 1) { |
| 119 | fprintf(stderr, "Error: missing filename\n"); |
| 120 | exit(EX_USAGE); |
| 121 | } |
| 122 | |
Lev Walkin | 5ba113b | 2005-04-08 19:28:18 +0000 | [diff] [blame^] | 123 | #ifdef ASN_DECODER_DEFAULT_OUTPUT_XML |
| 124 | if(!opt_print) opt_toxml++; |
| 125 | #endif |
| 126 | |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 127 | setvbuf(stdout, 0, _IOLBF, 0); |
| 128 | |
| 129 | for(num = 0; num < number_of_iterations; num++) { |
| 130 | int ac_i; |
| 131 | /* |
| 132 | * Process all files in turn. |
| 133 | */ |
| 134 | for(ac_i = 0; ac_i < ac; ac_i++) { |
| 135 | char *fname = av[ac_i]; |
| 136 | void *structure; |
| 137 | |
| 138 | /* |
| 139 | * Decode the encoded structure from file. |
| 140 | */ |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 141 | structure = data_decode_from_file(pduType, |
| 142 | fname, suggested_bufsize); |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 143 | if(!structure) { |
| 144 | /* Error message is already printed */ |
| 145 | exit(EX_DATAERR); |
| 146 | } |
| 147 | |
| 148 | fprintf(stderr, "%s: decoded successfully\n", fname); |
| 149 | |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 150 | if(opt_print) asn_fprint(stdout, pduType, structure); |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 151 | |
| 152 | if(opt_toxml |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 153 | && xer_fprint(stdout, pduType, structure)) { |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 154 | fprintf(stderr, "%s: Cannot convert into XML\n", fname); |
| 155 | exit(EX_UNAVAILABLE); |
| 156 | } |
| 157 | |
| 158 | /* Check ASN.1 constraints */ |
| 159 | if(opt_check) { |
| 160 | char errbuf[128]; |
| 161 | size_t errlen = sizeof(errbuf); |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 162 | if(asn_check_constraints(pduType, structure, |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 163 | errbuf, &errlen)) { |
| 164 | fprintf(stderr, "%s: ASN.1 constraint " |
| 165 | "check failed: %s\n", fname, errbuf); |
| 166 | exit(EX_DATAERR); |
| 167 | } |
| 168 | } |
| 169 | |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 170 | pduType->free_struct(pduType, structure, 0); |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 171 | } |
| 172 | } |
| 173 | |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | |
| 178 | static char *buffer; |
| 179 | static size_t buf_offset; /* Offset from the start */ |
| 180 | static size_t buf_len; /* Length of meaningful contents */ |
| 181 | static size_t buf_size; /* Allocated memory */ |
| 182 | static off_t buf_shifted; /* Number of bytes ever shifted */ |
| 183 | |
| 184 | #define bufptr (buffer + buf_offset) |
| 185 | #define bufend (buffer + buf_offset + buf_len) |
| 186 | |
| 187 | /* |
| 188 | * Ensure that the buffer contains at least this amoount of free space. |
| 189 | */ |
| 190 | static void buf_extend(size_t bySize) { |
| 191 | |
| 192 | DEBUG("buf_extend(%ld) { o=%ld l=%ld s=%ld }", |
| 193 | (long)bySize, (long)buf_offset, (long)buf_len, (long)buf_size); |
| 194 | |
| 195 | if(buf_size >= (buf_offset + buf_len + bySize)) { |
| 196 | return; /* Nothing to do */ |
| 197 | } else if(bySize <= buf_offset) { |
| 198 | DEBUG("\tContents shifted by %ld", (long)buf_offset); |
| 199 | |
| 200 | /* Shift the buffer contents */ |
| 201 | memmove(buffer, buffer + buf_offset, buf_len); |
| 202 | buf_shifted += buf_offset; |
| 203 | buf_offset = 0; |
| 204 | } else { |
| 205 | size_t newsize = (buf_size << 2) + bySize; |
| 206 | void *p = realloc(buffer, newsize); |
| 207 | if(p) { |
Lev Walkin | 814cca7 | 2004-12-15 23:23:53 +0000 | [diff] [blame] | 208 | buffer = (char *)p; |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 209 | buf_size = newsize; |
| 210 | |
| 211 | DEBUG("\tBuffer reallocated to %ld", (long)newsize); |
| 212 | } else { |
| 213 | perror("realloc()"); |
| 214 | exit(EX_OSERR); |
| 215 | } |
| 216 | } |
| 217 | } |
| 218 | |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 219 | static void *data_decode_from_file(asn_TYPE_descriptor_t *pduType, const char *fname, ssize_t suggested_bufsize) { |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 220 | static char *fbuf; |
| 221 | static ssize_t fbuf_size; |
| 222 | static asn_codec_ctx_t s_codec_ctx; |
| 223 | asn_codec_ctx_t *opt_codec_ctx = 0; |
| 224 | void *structure = 0; |
| 225 | size_t rd; |
| 226 | FILE *fp; |
| 227 | |
| 228 | if(opt_stack) { |
| 229 | s_codec_ctx.max_stack_size = opt_stack; |
| 230 | opt_codec_ctx = &s_codec_ctx; |
| 231 | } |
| 232 | |
| 233 | DEBUG("Processing file %s", fname); |
| 234 | |
| 235 | fp = fopen(fname, "r"); |
| 236 | |
| 237 | if(!fp) { |
| 238 | fprintf(stderr, "%s: %s\n", fname, strerror(errno)); |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | /* prepare the file buffer */ |
| 243 | if(fbuf_size != suggested_bufsize) { |
Lev Walkin | 814cca7 | 2004-12-15 23:23:53 +0000 | [diff] [blame] | 244 | fbuf = (char *)realloc(fbuf, suggested_bufsize); |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 245 | if(!fbuf) { |
| 246 | perror("realloc()"); |
| 247 | exit(EX_OSERR); |
| 248 | } |
| 249 | fbuf_size = suggested_bufsize; |
| 250 | } |
| 251 | |
| 252 | buf_shifted = 0; |
| 253 | buf_offset = 0; |
| 254 | buf_len = 0; |
| 255 | |
| 256 | while((rd = fread(fbuf, 1, fbuf_size, fp)) || !feof(fp)) { |
| 257 | asn_dec_rval_t rval; |
| 258 | int using_local_buf; |
| 259 | |
| 260 | /* |
| 261 | * Copy the data over, or use the original buffer. |
| 262 | */ |
| 263 | if(buf_len) { |
| 264 | /* Append the new data into the intermediate buffer */ |
| 265 | buf_extend(rd); |
| 266 | memcpy(bufend, fbuf, rd); |
| 267 | buf_len += rd; |
| 268 | |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 269 | rval = ber_decode(opt_codec_ctx, pduType, |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 270 | (void **)&structure, bufptr, buf_len); |
| 271 | DEBUG("ber_decode(%ld) consumed %ld, code %d", |
| 272 | (long)buf_len, (long)rval.consumed, rval.code); |
| 273 | |
| 274 | /* |
| 275 | * Adjust position inside the source buffer. |
| 276 | */ |
| 277 | assert(rval.consumed <= buf_len); |
| 278 | buf_offset += rval.consumed; |
| 279 | buf_len -= rval.consumed; |
| 280 | } else { |
| 281 | using_local_buf = 1; |
| 282 | |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 283 | /* Feed the chunk of data into a decoder routine */ |
| 284 | rval = ber_decode(opt_codec_ctx, pduType, |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 285 | (void **)&structure, fbuf, rd); |
| 286 | DEBUG("ber_decode(%ld) consumed %ld, code %d", |
| 287 | (long)rd, (long)rval.consumed, rval.code); |
| 288 | |
| 289 | /* |
| 290 | * Switch the remainder into the intermediate buffer. |
| 291 | */ |
| 292 | if(rval.code != RC_FAIL && rval.consumed < rd) { |
| 293 | buf_extend(rd - rval.consumed); |
| 294 | memcpy(bufend, |
| 295 | fbuf + rval.consumed, |
| 296 | rd - rval.consumed); |
| 297 | buf_len = rd - rval.consumed; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | switch(rval.code) { |
| 302 | case RC_OK: |
| 303 | DEBUG("RC_OK, finishing up"); |
| 304 | fclose(fp); |
| 305 | return structure; |
| 306 | case RC_WMORE: |
| 307 | DEBUG("RC_WMORE, continuing..."); |
| 308 | continue; |
| 309 | case RC_FAIL: |
| 310 | break; |
| 311 | } |
| 312 | break; |
| 313 | } |
| 314 | |
| 315 | fclose(fp); |
| 316 | |
| 317 | /* Clean up partially decoded structure */ |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 318 | pduType->free_struct(pduType, structure, 0); |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 319 | |
| 320 | fprintf(stderr, "%s: " |
Lev Walkin | 0094956 | 2005-03-10 13:39:03 +0000 | [diff] [blame] | 321 | "Decode failed past %lld byte\n", |
Lev Walkin | 22b5455 | 2004-10-28 13:22:54 +0000 | [diff] [blame] | 322 | fname, (long long)(buf_shifted + buf_offset)); |
| 323 | |
| 324 | return 0; |
| 325 | } |
| 326 | |