| 1 |
#include "EXTERN.h" |
| 2 |
#include "perl.h" |
| 3 |
#include "XSUB.h" |
| 4 |
|
| 5 |
// C99 required |
| 6 |
|
| 7 |
enum { |
| 8 |
// ASN_TAG |
| 9 |
ASN_BOOLEAN = 0x01, |
| 10 |
ASN_INTEGER32 = 0x02, |
| 11 |
ASN_BIT_STRING = 0x03, |
| 12 |
ASN_OCTET_STRING = 0x04, |
| 13 |
ASN_NULL = 0x05, |
| 14 |
ASN_OBJECT_IDENTIFIER = 0x06, |
| 15 |
ASN_REAL = 0x09, //X |
| 16 |
ASN_ENUMERATED = 0x0a, //X |
| 17 |
ASN_SEQUENCE = 0x10, |
| 18 |
ASN_SET = 0x11, //X |
| 19 |
ASN_UTC_TIME = 0x17, //X |
| 20 |
ASN_GENERAL_TIME = 0x18, //X |
| 21 |
|
| 22 |
ASN_TAG_BER = 0x1f, |
| 23 |
ASN_TAG_MASK = 0x1f, |
| 24 |
|
| 25 |
// primitive/constructed |
| 26 |
ASN_CONSTRUCTED = 0x20, |
| 27 |
|
| 28 |
// ASN_CLASS |
| 29 |
ASN_UNIVERSAL = 0x00, |
| 30 |
ASN_APPLICATION = 0x40, |
| 31 |
ASN_CONTEXT = 0x80, |
| 32 |
ASN_PRIVATE = 0xc0, |
| 33 |
|
| 34 |
ASN_CLASS_MASK = 0xc0, |
| 35 |
ASN_CLASS_SHIFT = 6, |
| 36 |
|
| 37 |
// ASN_APPLICATION SNMP |
| 38 |
ASN_IPADDRESS = 0x00, |
| 39 |
ASN_COUNTER32 = 0x01, |
| 40 |
ASN_UNSIGNED32 = 0x02, |
| 41 |
ASN_TIMETICKS = 0x03, |
| 42 |
ASN_OPAQUE = 0x04, |
| 43 |
ASN_COUNTER64 = 0x06, |
| 44 |
}; |
| 45 |
|
| 46 |
enum { |
| 47 |
BER_CLASS = 0, |
| 48 |
BER_TAG = 1, |
| 49 |
BER_CONSTRUCTED = 2, |
| 50 |
BER_DATA = 3, |
| 51 |
BER_ARRAYSIZE |
| 52 |
}; |
| 53 |
|
| 54 |
#define MAX_OID_STRLEN 4096 |
| 55 |
|
| 56 |
static U8 *buf, *cur; |
| 57 |
static STRLEN len, rem; |
| 58 |
|
| 59 |
// for "small" integers, return a readonly sv, otherwise create a new one |
| 60 |
static SV *newSVcacheint (int val) |
| 61 |
{ |
| 62 |
static SV *cache[32]; |
| 63 |
|
| 64 |
if (val < 0 || val >= sizeof (cache)) |
| 65 |
return newSViv (val); |
| 66 |
|
| 67 |
if (!cache [val]) |
| 68 |
{ |
| 69 |
cache [val] = newSVuv (val); |
| 70 |
SvREADONLY_on (cache [val]); |
| 71 |
} |
| 72 |
|
| 73 |
return SvREFCNT_inc_NN (cache [val]); |
| 74 |
} |
| 75 |
|
| 76 |
///////////////////////////////////////////////////////////////////////////// |
| 77 |
|
| 78 |
static void |
| 79 |
error (const char *errmsg) |
| 80 |
{ |
| 81 |
croak ("%s at offset 0x%04x", errmsg, cur - buf); |
| 82 |
} |
| 83 |
|
| 84 |
static int |
| 85 |
need (int count) |
| 86 |
{ |
| 87 |
if (count < 0 || (int)rem < count) |
| 88 |
{ |
| 89 |
error ("unexpected end of message buffer"); |
| 90 |
return 0; |
| 91 |
} |
| 92 |
|
| 93 |
return 1; |
| 94 |
} |
| 95 |
|
| 96 |
// get_* functions fetch something from the buffer |
| 97 |
// decode_* functions use get_* fun ctions to decode ber values |
| 98 |
|
| 99 |
static U8 * |
| 100 |
get_n (int count, const U8 *errres) |
| 101 |
{ |
| 102 |
if (!need (count)) |
| 103 |
return (U8 *)errres; |
| 104 |
|
| 105 |
U8 *res = cur; |
| 106 |
|
| 107 |
cur += count; |
| 108 |
rem -= count; |
| 109 |
|
| 110 |
return res; |
| 111 |
} |
| 112 |
|
| 113 |
static U8 |
| 114 |
get_u8 (void) |
| 115 |
{ |
| 116 |
if (rem <= 0) |
| 117 |
{ |
| 118 |
error ("unexpected end of message buffer"); |
| 119 |
return 0; |
| 120 |
} |
| 121 |
|
| 122 |
rem--; |
| 123 |
return *cur++; |
| 124 |
} |
| 125 |
|
| 126 |
static U32 |
| 127 |
get_ber (void) |
| 128 |
{ |
| 129 |
U32 res = 0; |
| 130 |
|
| 131 |
for (;;) |
| 132 |
{ |
| 133 |
U8 c = get_u8 (); |
| 134 |
res = (res << 7) | (c & 0x7f); |
| 135 |
|
| 136 |
if (!(c & 0x80)) |
| 137 |
return res; |
| 138 |
} |
| 139 |
} |
| 140 |
|
| 141 |
static U32 |
| 142 |
get_length (void) |
| 143 |
{ |
| 144 |
U32 res = get_u8 (); |
| 145 |
|
| 146 |
if (res & 0x80) |
| 147 |
{ |
| 148 |
int cnt = res & 0x7f; |
| 149 |
res = 0; |
| 150 |
|
| 151 |
switch (cnt) |
| 152 |
{ |
| 153 |
case 0: |
| 154 |
error ("indefinite ASN.1 lengths not supported"); |
| 155 |
return 0; |
| 156 |
|
| 157 |
default: |
| 158 |
error ("ASN.1 length too long"); |
| 159 |
return 0; |
| 160 |
|
| 161 |
case 4: res = (res << 8) | get_u8 (); |
| 162 |
case 3: res = (res << 8) | get_u8 (); |
| 163 |
case 2: res = (res << 8) | get_u8 (); |
| 164 |
case 1: res = (res << 8) | get_u8 (); |
| 165 |
} |
| 166 |
} |
| 167 |
|
| 168 |
return res; |
| 169 |
} |
| 170 |
|
| 171 |
static U32 |
| 172 |
get_integer32 (void) |
| 173 |
{ |
| 174 |
U32 length = get_length (); |
| 175 |
|
| 176 |
if (length <= 0) |
| 177 |
{ |
| 178 |
error ("INTEGER32 length equal to zero"); |
| 179 |
return 0; |
| 180 |
} |
| 181 |
|
| 182 |
U8 *data = get_n (length, 0); |
| 183 |
|
| 184 |
if (!data) |
| 185 |
return 0; |
| 186 |
|
| 187 |
if (length > 5 || (length > 4 && data [0])) |
| 188 |
{ |
| 189 |
error ("INTEGER32 length too long"); |
| 190 |
return 0; |
| 191 |
} |
| 192 |
|
| 193 |
U32 res = data [0] & 0x80 ? 0xffffffff : 0; |
| 194 |
|
| 195 |
while (length--) |
| 196 |
res = (res << 8) | *data++; |
| 197 |
|
| 198 |
return res; |
| 199 |
} |
| 200 |
|
| 201 |
static SV * |
| 202 |
decode_integer32 (void) |
| 203 |
{ |
| 204 |
return newSViv ((I32)get_integer32 ()); |
| 205 |
} |
| 206 |
|
| 207 |
static SV * |
| 208 |
decode_unsigned32 (void) |
| 209 |
{ |
| 210 |
return newSVuv ((U32)get_integer32 ()); |
| 211 |
} |
| 212 |
|
| 213 |
#if IVSIZE >= 8 |
| 214 |
|
| 215 |
static U64TYPE |
| 216 |
get_integer64 (void) |
| 217 |
{ |
| 218 |
U32 length = get_length (); |
| 219 |
|
| 220 |
if (length <= 0) |
| 221 |
{ |
| 222 |
error ("INTEGER64 length equal to zero"); |
| 223 |
return 0; |
| 224 |
} |
| 225 |
|
| 226 |
U8 *data = get_n (length, 0); |
| 227 |
|
| 228 |
if (!data) |
| 229 |
return 0; |
| 230 |
|
| 231 |
if (length > 9 || (length > 8 && data [0])) |
| 232 |
{ |
| 233 |
error ("INTEGER64 length too long"); |
| 234 |
return 0; |
| 235 |
} |
| 236 |
|
| 237 |
U64TYPE res = data [0] & 0x80 ? 0xffffffffffffffff : 0; |
| 238 |
|
| 239 |
while (length--) |
| 240 |
res = (res << 8) | *data++; |
| 241 |
|
| 242 |
return res; |
| 243 |
} |
| 244 |
|
| 245 |
static SV * |
| 246 |
decode_integer64 (void) |
| 247 |
{ |
| 248 |
return newSViv ((I64TYPE)get_integer64 ()); |
| 249 |
} |
| 250 |
|
| 251 |
static SV * |
| 252 |
decode_unsigned64 (void) |
| 253 |
{ |
| 254 |
return newSVuv ((U64TYPE)get_integer64 ()); |
| 255 |
} |
| 256 |
|
| 257 |
#endif |
| 258 |
|
| 259 |
static SV * |
| 260 |
decode_octet_string (void) |
| 261 |
{ |
| 262 |
U32 length = get_length (); |
| 263 |
|
| 264 |
U8 *data = get_n (length, 0); |
| 265 |
if (!data) |
| 266 |
{ |
| 267 |
error ("OCTET STRING too long"); |
| 268 |
return &PL_sv_undef; |
| 269 |
} |
| 270 |
|
| 271 |
return newSVpvn (data, length); |
| 272 |
} |
| 273 |
|
| 274 |
// gelper for decode_object_identifier |
| 275 |
static char * |
| 276 |
write_uv (char *buf, U32 u) |
| 277 |
{ |
| 278 |
// the one-digit case is absolutely predominant, so this pays off (hopefully) |
| 279 |
if (u < 10) |
| 280 |
*buf++ = u + '0'; |
| 281 |
else |
| 282 |
{ |
| 283 |
char *beg = buf; |
| 284 |
|
| 285 |
do |
| 286 |
{ |
| 287 |
*buf++ = u % 10 + '0'; |
| 288 |
u /= 10; |
| 289 |
} |
| 290 |
while (u); |
| 291 |
|
| 292 |
// reverse digits |
| 293 |
for (char *ptr = buf; --ptr != beg; ++beg) |
| 294 |
{ |
| 295 |
char c = *ptr; |
| 296 |
*ptr = *beg; |
| 297 |
*beg = c; |
| 298 |
} |
| 299 |
} |
| 300 |
|
| 301 |
return buf; |
| 302 |
} |
| 303 |
|
| 304 |
static SV * |
| 305 |
decode_object_identifier (void) |
| 306 |
{ |
| 307 |
U32 length = get_length (); |
| 308 |
|
| 309 |
if (length <= 0) |
| 310 |
{ |
| 311 |
error ("OBJECT IDENTIFIER length equal to zero"); |
| 312 |
return &PL_sv_undef; |
| 313 |
} |
| 314 |
|
| 315 |
U8 *end = cur + length; |
| 316 |
U32 w = get_ber (); |
| 317 |
|
| 318 |
static char oid[MAX_OID_STRLEN]; // must be static |
| 319 |
char *app = oid; |
| 320 |
|
| 321 |
app = write_uv (app, (U8)w / 40); |
| 322 |
*app++ = '.'; |
| 323 |
app = write_uv (app, (U8)w % 40); |
| 324 |
|
| 325 |
// we assume an oid component is never > 64 bytes |
| 326 |
while (cur < end && oid + sizeof (oid) - app > 64) |
| 327 |
{ |
| 328 |
w = get_ber (); |
| 329 |
*app++ = '.'; |
| 330 |
app = write_uv (app, w); |
| 331 |
} |
| 332 |
|
| 333 |
return newSVpvn (oid, app - oid); |
| 334 |
} |
| 335 |
|
| 336 |
static SV * |
| 337 |
decode_ber () |
| 338 |
{ |
| 339 |
int identifier = get_u8 (); |
| 340 |
|
| 341 |
SV *res; |
| 342 |
|
| 343 |
int constructed = identifier & ASN_CONSTRUCTED; |
| 344 |
int klass = identifier & ASN_CLASS_MASK; |
| 345 |
int tag = identifier & ASN_TAG_MASK; |
| 346 |
|
| 347 |
if (tag == ASN_TAG_BER) |
| 348 |
tag = get_ber (); |
| 349 |
|
| 350 |
if (tag == ASN_TAG_BER) |
| 351 |
tag = get_ber (); |
| 352 |
|
| 353 |
if (constructed) |
| 354 |
{ |
| 355 |
U32 len = get_length (); |
| 356 |
U32 seqend = (cur - buf) + len; |
| 357 |
AV *av = (AV *)sv_2mortal ((SV *)newAV ()); |
| 358 |
|
| 359 |
while (cur < buf + seqend) |
| 360 |
av_push (av, decode_ber ()); |
| 361 |
|
| 362 |
if (cur > buf + seqend) |
| 363 |
croak ("constructed type %02x overflow (%x %x)\n", identifier, cur - buf, seqend); |
| 364 |
|
| 365 |
res = newRV_inc ((SV *)av); |
| 366 |
} |
| 367 |
else |
| 368 |
switch (identifier) |
| 369 |
{ |
| 370 |
case ASN_NULL: |
| 371 |
res = &PL_sv_undef; |
| 372 |
break; |
| 373 |
|
| 374 |
case ASN_OBJECT_IDENTIFIER: |
| 375 |
res = decode_object_identifier (); |
| 376 |
break; |
| 377 |
|
| 378 |
case ASN_INTEGER32: |
| 379 |
res = decode_integer32 (); |
| 380 |
break; |
| 381 |
|
| 382 |
case ASN_APPLICATION | ASN_UNSIGNED32: |
| 383 |
case ASN_APPLICATION | ASN_COUNTER32: |
| 384 |
case ASN_APPLICATION | ASN_TIMETICKS: |
| 385 |
res = decode_unsigned32 (); |
| 386 |
break; |
| 387 |
|
| 388 |
#if 0 // handled by default case |
| 389 |
case ASN_OCTET_STRING: |
| 390 |
case ASN_APPLICATION | ASN_IPADDRESS: |
| 391 |
case ASN_APPLICATION | ASN_OPAQUE: |
| 392 |
res = decode_octet_string (); |
| 393 |
break; |
| 394 |
#endif |
| 395 |
|
| 396 |
case ASN_APPLICATION | ASN_COUNTER64: |
| 397 |
res = decode_integer64 (); |
| 398 |
break; |
| 399 |
|
| 400 |
default: |
| 401 |
res = decode_octet_string (); |
| 402 |
break; |
| 403 |
} |
| 404 |
|
| 405 |
AV *av = newAV (); |
| 406 |
av_fill (av, BER_ARRAYSIZE - 1); |
| 407 |
AvARRAY (av)[BER_CLASS ] = newSVcacheint (klass >> ASN_CLASS_SHIFT); |
| 408 |
AvARRAY (av)[BER_TAG ] = newSVcacheint (tag); |
| 409 |
AvARRAY (av)[BER_CONSTRUCTED] = newSVcacheint (constructed ? 1 : 0); |
| 410 |
AvARRAY (av)[BER_DATA ] = res; |
| 411 |
|
| 412 |
return newRV_noinc ((SV *)av); |
| 413 |
} |
| 414 |
|
| 415 |
MODULE = Convert::BER::XS PACKAGE = Convert::BER::XS |
| 416 |
|
| 417 |
PROTOTYPES: ENABLE |
| 418 |
|
| 419 |
BOOT: |
| 420 |
{ |
| 421 |
HV *stash = gv_stashpv ("Convert::BER::XS", 1); |
| 422 |
|
| 423 |
static const struct { |
| 424 |
const char *name; |
| 425 |
IV iv; |
| 426 |
} *civ, const_iv[] = { |
| 427 |
{ "ASN_BOOLEAN", ASN_BOOLEAN }, |
| 428 |
{ "ASN_INTEGER32", ASN_INTEGER32 }, |
| 429 |
{ "ASN_BIT_STRING", ASN_BIT_STRING }, |
| 430 |
{ "ASN_OCTET_STRING", ASN_OCTET_STRING }, |
| 431 |
{ "ASN_NULL", ASN_NULL }, |
| 432 |
{ "ASN_OBJECT_IDENTIFIER", ASN_OBJECT_IDENTIFIER }, |
| 433 |
{ "ASN_TAG_BER", ASN_TAG_BER }, |
| 434 |
{ "ASN_TAG_MASK", ASN_TAG_MASK }, |
| 435 |
{ "ASN_CONSTRUCTED", ASN_CONSTRUCTED }, |
| 436 |
{ "ASN_UNIVERSAL", ASN_UNIVERSAL >> ASN_CLASS_SHIFT }, |
| 437 |
{ "ASN_APPLICATION", ASN_APPLICATION >> ASN_CLASS_SHIFT }, |
| 438 |
{ "ASN_CONTEXT", ASN_CONTEXT >> ASN_CLASS_SHIFT }, |
| 439 |
{ "ASN_PRIVATE", ASN_PRIVATE >> ASN_CLASS_SHIFT }, |
| 440 |
{ "ASN_CLASS_MASK", ASN_CLASS_MASK }, |
| 441 |
{ "ASN_CLASS_SHIFT", ASN_CLASS_SHIFT }, |
| 442 |
{ "ASN_SEQUENCE", ASN_SEQUENCE }, |
| 443 |
{ "ASN_IPADDRESS", ASN_IPADDRESS }, |
| 444 |
{ "ASN_COUNTER32", ASN_COUNTER32 }, |
| 445 |
{ "ASN_UNSIGNED32", ASN_UNSIGNED32 }, |
| 446 |
{ "ASN_TIMETICKS", ASN_TIMETICKS }, |
| 447 |
{ "ASN_OPAQUE", ASN_OPAQUE }, |
| 448 |
{ "ASN_COUNTER64", ASN_COUNTER64 }, |
| 449 |
|
| 450 |
{ "BER_CLASS" , BER_CLASS }, |
| 451 |
{ "BER_TAG" , BER_TAG }, |
| 452 |
{ "BER_CONSTRUCTED", BER_CONSTRUCTED }, |
| 453 |
{ "BER_DATA" , BER_DATA }, |
| 454 |
}; |
| 455 |
|
| 456 |
for (civ = const_iv + sizeof (const_iv) / sizeof (const_iv [0]); civ > const_iv; civ--) |
| 457 |
newCONSTSUB (stash, (char *)civ[-1].name, newSViv (civ[-1].iv)); |
| 458 |
} |
| 459 |
|
| 460 |
SV * |
| 461 |
ber_decode (SV *ber) |
| 462 |
CODE: |
| 463 |
{ |
| 464 |
buf = SvPVbyte (ber, len); |
| 465 |
cur = buf; |
| 466 |
rem = len; |
| 467 |
|
| 468 |
RETVAL = decode_ber (); |
| 469 |
} |
| 470 |
OUTPUT: RETVAL |
| 471 |
|
| 472 |
void |
| 473 |
ber_is (SV *tuple, SV *klass = &PL_sv_undef, SV *tag = &PL_sv_undef, SV *constructed = &PL_sv_undef, SV *data = &PL_sv_undef) |
| 474 |
PROTOTYPE: $;$$$ |
| 475 |
PPCODE: |
| 476 |
{ |
| 477 |
if (!SvOK (tuple)) |
| 478 |
XSRETURN_NO; |
| 479 |
|
| 480 |
if (!SvROK (tuple) || SvTYPE (SvRV (tuple)) != SVt_PVAV) |
| 481 |
croak ("ber_seq: tuple must be ber tuple (array-ref)"); |
| 482 |
|
| 483 |
AV *av = (AV *)SvRV (tuple); |
| 484 |
|
| 485 |
XPUSHs ( |
| 486 |
(!SvOK (klass) || SvIV (AvARRAY (av)[BER_CLASS ]) == SvIV (klass)) |
| 487 |
&& (!SvOK (tag) || SvIV (AvARRAY (av)[BER_TAG ]) == SvIV (tag)) |
| 488 |
&& (!SvOK (constructed) || !SvIV (AvARRAY (av)[BER_CONSTRUCTED]) == !SvIV (constructed)) |
| 489 |
&& (!SvOK (data) || sv_eq (AvARRAY (av)[BER_DATA ], data)) |
| 490 |
? &PL_sv_yes : &PL_sv_no); |
| 491 |
} |
| 492 |
|
| 493 |
void |
| 494 |
ber_is_seq (SV *tuple) |
| 495 |
PROTOTYPE: $ |
| 496 |
PPCODE: |
| 497 |
{ |
| 498 |
if (!SvOK (tuple)) |
| 499 |
XSRETURN_UNDEF; |
| 500 |
|
| 501 |
if (!SvROK (tuple) || SvTYPE (SvRV (tuple)) != SVt_PVAV) |
| 502 |
croak ("ber_seq: tuple must be ber tuple (array-ref)"); |
| 503 |
|
| 504 |
AV *av = (AV *)SvRV (tuple); |
| 505 |
|
| 506 |
XPUSHs ( |
| 507 |
SvIV (AvARRAY (av)[BER_CLASS ]) == ASN_UNIVERSAL |
| 508 |
&& SvIV (AvARRAY (av)[BER_TAG ]) == ASN_SEQUENCE |
| 509 |
&& SvIV (AvARRAY (av)[BER_CONSTRUCTED]) |
| 510 |
? AvARRAY (av)[BER_DATA] : &PL_sv_undef); |
| 511 |
} |
| 512 |
|
| 513 |
void |
| 514 |
ber_is_i32 (SV *tuple, IV value) |
| 515 |
PROTOTYPE: $$ |
| 516 |
PPCODE: |
| 517 |
{ |
| 518 |
if (!SvOK (tuple)) |
| 519 |
XSRETURN_NO; |
| 520 |
|
| 521 |
if (!SvROK (tuple) || SvTYPE (SvRV (tuple)) != SVt_PVAV) |
| 522 |
croak ("ber_seq: tuple must be ber tuple (array-ref)"); |
| 523 |
|
| 524 |
AV *av = (AV *)SvRV (tuple); |
| 525 |
|
| 526 |
XPUSHs ( |
| 527 |
SvIV (AvARRAY (av)[BER_CLASS ]) == ASN_UNIVERSAL |
| 528 |
&& SvIV (AvARRAY (av)[BER_TAG ]) == ASN_INTEGER32 |
| 529 |
&& !SvIV (AvARRAY (av)[BER_CONSTRUCTED]) |
| 530 |
&& SvIV (AvARRAY (av)[BER_DATA ]) == value |
| 531 |
? &PL_sv_yes : &PL_sv_no); |
| 532 |
} |
| 533 |
|
| 534 |
void |
| 535 |
ber_is_oid (SV *tuple, SV *oid) |
| 536 |
PROTOTYPE: $$ |
| 537 |
PPCODE: |
| 538 |
{ |
| 539 |
if (!SvOK (tuple)) |
| 540 |
XSRETURN_NO; |
| 541 |
|
| 542 |
if (!SvROK (tuple) || SvTYPE (SvRV (tuple)) != SVt_PVAV) |
| 543 |
croak ("ber_seq: tuple must be ber tuple (array-ref)"); |
| 544 |
|
| 545 |
AV *av = (AV *)SvRV (tuple); |
| 546 |
|
| 547 |
XPUSHs ( |
| 548 |
SvIV (AvARRAY (av)[BER_CLASS ]) == ASN_UNIVERSAL |
| 549 |
&& SvIV (AvARRAY (av)[BER_TAG ]) == ASN_OBJECT_IDENTIFIER |
| 550 |
&& !SvIV (AvARRAY (av)[BER_CONSTRUCTED]) |
| 551 |
&& sv_eq (AvARRAY (av)[BER_DATA], oid) |
| 552 |
? &PL_sv_yes : &PL_sv_no); |
| 553 |
} |
| 554 |
|
