scripts/mod/sumversion.c

   1 #include <netinet/in.h>
   2 #ifdef __sun__
   3 #include <inttypes.h>
   4 #else
   5 #include <stdint.h>
   6 #endif
   7 #include <ctype.h>
   8 #include <errno.h>
   9 #include <string.h>
  10 #include "modpost.h"
  11
  12 /*
  13  * Stolen form Cryptographic API.
  14  *
  15  * MD4 Message Digest Algorithm (RFC1320).
  16  *
  17  * Implementation derived from Andrew Tridgell and Steve French's
  18  * CIFS MD4 implementation, and the cryptoapi implementation
  19  * originally based on the public domain implementation written
  20  * by Colin Plumb in 1993.
  21  *
  22  * Copyright (c) Andrew Tridgell 1997-1998.
  23  * Modified by Steve French (sfrench@us.ibm.com) 2002
  24  * Copyright (c) Cryptoapi developers.
  25  * Copyright (c) 2002 David S. Miller (davem@redhat.com)
  26  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  27  *
  28  * This program is free software; you can redistribute it and/or modify
  29  * it under the terms of the GNU General Public License as published by
  30  * the Free Software Foundation; either version 2 of the License, or
  31  * (at your option) any later version.
  32  *
  33  */
  34 #define MD4_DIGEST_SIZE         16
  35 #define MD4_HMAC_BLOCK_SIZE     64
  36 #define MD4_BLOCK_WORDS         16
  37 #define MD4_HASH_WORDS          4
  38
  39 struct md4_ctx {
  40         uint32_t hash[MD4_HASH_WORDS];
  41         uint32_t block[MD4_BLOCK_WORDS];
  42         uint64_t byte_count;
  43 };
  44
  45 static inline uint32_t lshift(uint32_t x, unsigned int s)
  46 {
  47         x &= 0xFFFFFFFF;
  48         return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
  49 }
  50
  51 static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z)
  52 {
  53         return (x & y) | ((~x) & z);
  54 }
  55
  56 static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z)
  57 {
  58         return (x & y) | (x & z) | (y & z);
  59 }
  60
  61 static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z)
  62 {
  63         return x ^ y ^ z;
  64 }
  65
  66 #define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
  67 #define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (uint32_t)0x5A827999,s))
  68 #define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (uint32_t)0x6ED9EBA1,s))
  69
  70 /* XXX: this stuff can be optimized */
  71 static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words)
  72 {
  73         while (words--) {
  74                 *buf = ntohl(*buf);
  75                 buf++;
  76         }
  77 }
  78
  79 static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words)
  80 {
  81         while (words--) {
  82                 *buf = htonl(*buf);
  83                 buf++;
  84         }
  85 }
  86
  87 static void md4_transform(uint32_t *hash, uint32_t const *in)
  88 {
  89         uint32_t a, b, c, d;
  90
  91         a = hash[0];
  92         b = hash[1];
  93         c = hash[2];
  94         d = hash[3];
  95
  96         ROUND1(a, b, c, d, in[0], 3);
  97         ROUND1(d, a, b, c, in[1], 7);
  98         ROUND1(c, d, a, b, in[2], 11);
  99         ROUND1(b, c, d, a, in[3], 19);
 100         ROUND1(a, b, c, d, in[4], 3);
 101         ROUND1(d, a, b, c, in[5], 7);
 102         ROUND1(c, d, a, b, in[6], 11);
 103         ROUND1(b, c, d, a, in[7], 19);
 104         ROUND1(a, b, c, d, in[8], 3);
 105         ROUND1(d, a, b, c, in[9], 7);
 106         ROUND1(c, d, a, b, in[10], 11);
 107         ROUND1(b, c, d, a, in[11], 19);
 108         ROUND1(a, b, c, d, in[12], 3);
 109         ROUND1(d, a, b, c, in[13], 7);
 110         ROUND1(c, d, a, b, in[14], 11);
 111         ROUND1(b, c, d, a, in[15], 19);
 112
 113         ROUND2(a, b, c, d,in[ 0], 3);
 114         ROUND2(d, a, b, c, in[4], 5);
 115         ROUND2(c, d, a, b, in[8], 9);
 116         ROUND2(b, c, d, a, in[12], 13);
 117         ROUND2(a, b, c, d, in[1], 3);
 118         ROUND2(d, a, b, c, in[5], 5);
 119         ROUND2(c, d, a, b, in[9], 9);
 120         ROUND2(b, c, d, a, in[13], 13);
 121         ROUND2(a, b, c, d, in[2], 3);
 122         ROUND2(d, a, b, c, in[6], 5);
 123         ROUND2(c, d, a, b, in[10], 9);
 124         ROUND2(b, c, d, a, in[14], 13);
 125         ROUND2(a, b, c, d, in[3], 3);
 126         ROUND2(d, a, b, c, in[7], 5);
 127         ROUND2(c, d, a, b, in[11], 9);
 128         ROUND2(b, c, d, a, in[15], 13);
 129
 130         ROUND3(a, b, c, d,in[ 0], 3);
 131         ROUND3(d, a, b, c, in[8], 9);
 132         ROUND3(c, d, a, b, in[4], 11);
 133         ROUND3(b, c, d, a, in[12], 15);
 134         ROUND3(a, b, c, d, in[2], 3);
 135         ROUND3(d, a, b, c, in[10], 9);
 136         ROUND3(c, d, a, b, in[6], 11);
 137         ROUND3(b, c, d, a, in[14], 15);
 138         ROUND3(a, b, c, d, in[1], 3);
 139         ROUND3(d, a, b, c, in[9], 9);
 140         ROUND3(c, d, a, b, in[5], 11);
 141         ROUND3(b, c, d, a, in[13], 15);
 142         ROUND3(a, b, c, d, in[3], 3);
 143         ROUND3(d, a, b, c, in[11], 9);
 144         ROUND3(c, d, a, b, in[7], 11);
 145         ROUND3(b, c, d, a, in[15], 15);
 146
 147         hash[0] += a;
 148         hash[1] += b;
 149         hash[2] += c;
 150         hash[3] += d;
 151 }
 152
 153 static inline void md4_transform_helper(struct md4_ctx *ctx)
 154 {
 155         le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t));
 156         md4_transform(ctx->hash, ctx->block);
 157 }
 158
 159 static void md4_init(struct md4_ctx *mctx)
 160 {
 161         mctx->hash[0] = 0x67452301;
 162         mctx->hash[1] = 0xefcdab89;
 163         mctx->hash[2] = 0x98badcfe;
 164         mctx->hash[3] = 0x10325476;
 165         mctx->byte_count = 0;
 166 }
 167
 168 static void md4_update(struct md4_ctx *mctx,
 169                        const unsigned char *data, unsigned int len)
 170 {
 171         const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 172
 173         mctx->byte_count += len;
 174
 175         if (avail > len) {
 176                 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 177                        data, len);
 178                 return;
 179         }
 180
 181         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 182                data, avail);
 183
 184         md4_transform_helper(mctx);
 185         data += avail;
 186         len -= avail;
 187
 188         while (len >= sizeof(mctx->block)) {
 189                 memcpy(mctx->block, data, sizeof(mctx->block));
 190                 md4_transform_helper(mctx);
 191                 data += sizeof(mctx->block);
 192                 len -= sizeof(mctx->block);
 193         }
 194
 195         memcpy(mctx->block, data, len);
 196 }
 197
 198 static void md4_final_ascii(struct md4_ctx *mctx, char *out, unsigned int len)
 199 {
 200         const unsigned int offset = mctx->byte_count & 0x3f;
 201         char *p = (char *)mctx->block + offset;
 202         int padding = 56 - (offset + 1);
 203
 204         *p++ = 0x80;
 205         if (padding < 0) {
 206                 memset(p, 0x00, padding + sizeof (uint64_t));
 207                 md4_transform_helper(mctx);
 208                 p = (char *)mctx->block;
 209                 padding = 56;
 210         }
 211
 212         memset(p, 0, padding);
 213         mctx->block[14] = mctx->byte_count << 3;
 214         mctx->block[15] = mctx->byte_count >> 29;
 215         le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
 216                           sizeof(uint64_t)) / sizeof(uint32_t));
 217         md4_transform(mctx->hash, mctx->block);
 218         cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t));
 219
 220         snprintf(out, len, "%08X%08X%08X%08X",
 221                  mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]);
 222 }
 223
 224 static inline void add_char(unsigned char c, struct md4_ctx *md)
 225 {
 226         md4_update(md, &c, 1);
 227 }
 228
 229 static int parse_string(const char *file, unsigned long len,
 230                         struct md4_ctx *md)
 231 {
 232         unsigned long i;
 233
 234         add_char(file[0], md);
 235         for (i = 1; i < len; i++) {
 236                 add_char(file[i], md);
 237                 if (file[i] == '"' && file[i-1] != '\\')
 238                         break;
 239         }
 240         return i;
 241 }
 242
 243 static int parse_comment(const char *file, unsigned long len)
 244 {
 245         unsigned long i;
 246
 247         for (i = 2; i < len; i++) {
 248                 if (file[i-1] == '*' && file[i] == '/')
 249                         break;
 250         }
 251         return i;
 252 }
 253
 254 /* FIXME: Handle .s files differently (eg. # starts comments) --RR */
 255 static int parse_file(const char *fname, struct md4_ctx *md)
 256 {
 257         char *file;
 258         unsigned long i, len;
 259
 260         file = grab_file(fname, &len);
 261         if (!file)
 262                 return 0;
 263
 264         for (i = 0; i < len; i++) {
 265                 /* Collapse and ignore \ and CR. */
 266                 if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') {
 267                         i++;
 268                         continue;
 269                 }
 270
 271                 /* Ignore whitespace */
 272                 if (isspace(file[i]))
 273                         continue;
 274
 275                 /* Handle strings as whole units */
 276                 if (file[i] == '"') {
 277                         i += parse_string(file+i, len - i, md);
 278                         continue;
 279                 }
 280
 281                 /* Comments: ignore */
 282                 if (file[i] == '/' && file[i+1] == '*') {
 283                         i += parse_comment(file+i, len - i);
 284                         continue;
 285                 }
 286
 287                 add_char(file[i], md);
 288         }
 289         release_file(file, len);
 290         return 1;
 291 }
 292
 293 /* We have dir/file.o.  Open dir/.file.o.cmd, look for deps_ line to
 294  * figure out source file. */
 295 static int parse_source_files(const char *objfile, struct md4_ctx *md)
 296 {
 297         char *cmd, *file, *line, *dir;
 298         const char *base;
 299         unsigned long flen, pos = 0;
 300         int dirlen, ret = 0, check_files = 0;
 301
 302         cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd")));
 303
 304         base = strrchr(objfile, '/');
 305         if (base) {
 306                 base++;
 307                 dirlen = base - objfile;
 308                 sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base);
 309         } else {
 310                 dirlen = 0;
 311                 sprintf(cmd, ".%s.cmd", objfile);
 312         }
 313         dir = NOFAIL(malloc(dirlen + 1));
 314         strncpy(dir, objfile, dirlen);
 315         dir[dirlen] = '\0';
 316
 317         file = grab_file(cmd, &flen);
 318         if (!file) {
 319                 fprintf(stderr, "Warning: could not find %s for %s\n",
 320                         cmd, objfile);
 321                 goto out;
 322         }
 323
 324         /* There will be a line like so:
 325                 deps_drivers/net/dummy.o := \
 326                   drivers/net/dummy.c \
 327                     $(wildcard include/config/net/fastroute.h) \
 328                   include/linux/config.h \
 329                     $(wildcard include/config/h.h) \
 330                   include/linux/module.h \
 331
 332            Sum all files in the same dir or subdirs.
 333         */
 334         while ((line = get_next_line(&pos, file, flen)) != NULL) {
 335                 char* p = line;
 336                 if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {
 337                         check_files = 1;
 338                         continue;
 339                 }
 340                 if (!check_files)
 341                         continue;
 342
 343                 /* Continue until line does not end with '\' */
 344                 if ( *(p + strlen(p)-1) != '\\')
 345                         break;
 346                 /* Terminate line at first space, to get rid of final ' \' */
 347                 while (*p) {
 348                        if (isspace(*p)) {
 349                                 *p = '\0';
 350                                 break;
 351                         }
 352                         p++;
 353                 }
 354
 355                 /* Check if this file is in same dir as objfile */
 356                 if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) {
 357                         if (!parse_file(line, md)) {
 358                                 fprintf(stderr,
 359                                         "Warning: could not open %s: %s\n",
 360                                         line, strerror(errno));
 361                                 goto out_file;
 362                         }
 363
 364                 }
 365
 366         }
 367
 368         /* Everyone parsed OK */
 369         ret = 1;
 370 out_file:
 371         release_file(file, flen);
 372 out:
 373         free(dir);
 374         free(cmd);
 375         return ret;
 376 }
 377
 378 /* Calc and record src checksum. */
 379 void get_src_version(const char *modname, char sum[], unsigned sumlen)
 380 {
 381         void *file;
 382         unsigned long len;
 383         struct md4_ctx md;
 384         char *sources, *end, *fname;
 385         const char *basename;
 386         char filelist[strlen(getenv("MODVERDIR")) + strlen("/") +
 387                       strlen(modname) - strlen(".o") + strlen(".mod") + 1 ];
 388
 389         /* Source files for module are in .tmp_versions/modname.mod,
 390            after the first line. */
 391         if (strrchr(modname, '/'))
 392                 basename = strrchr(modname, '/') + 1;
 393         else
 394                 basename = modname;
 395         sprintf(filelist, "%s/%.*s.mod", getenv("MODVERDIR"),
 396                 (int) strlen(basename) - 2, basename);
 397
 398         file = grab_file(filelist, &len);
 399         if (!file) {
 400                 fprintf(stderr, "Warning: could not find versions for %s\n",
 401                         filelist);
 402                 return;
 403         }
 404
 405         sources = strchr(file, '\n');
 406         if (!sources) {
 407                 fprintf(stderr, "Warning: malformed versions file for %s\n",
 408                         modname);
 409                 goto release;
 410         }
 411
 412         sources++;
 413         end = strchr(sources, '\n');
 414         if (!end) {
 415                 fprintf(stderr, "Warning: bad ending versions file for %s\n",
 416                         modname);
 417                 goto release;
 418         }
 419         *end = '\0';
 420
 421         md4_init(&md);
 422         while ((fname = strsep(&sources, " ")) != NULL) {
 423                 if (!*fname)
 424                         continue;
 425                 if (!parse_source_files(fname, &md))
 426                         goto release;
 427         }
 428
 429         md4_final_ascii(&md, sum, sumlen);
 430 release:
 431         release_file(file, len);
 432 }
 433
 434 static void write_version(const char *filename, const char *sum,
 435                           unsigned long offset)
 436 {
 437         int fd;
 438
 439         fd = open(filename, O_RDWR);
 440         if (fd < 0) {
 441                 fprintf(stderr, "Warning: changing sum in %s failed: %s\n",
 442                         filename, strerror(errno));
 443                 return;
 444         }
 445
 446         if (lseek(fd, offset, SEEK_SET) == (off_t)-1) {
 447                 fprintf(stderr, "Warning: changing sum in %s:%lu failed: %s\n",
 448                         filename, offset, strerror(errno));
 449                 goto out;
 450         }
 451
 452         if (write(fd, sum, strlen(sum)+1) != strlen(sum)+1) {
 453                 fprintf(stderr, "Warning: writing sum in %s failed: %s\n",
 454                         filename, strerror(errno));
 455                 goto out;
 456         }
 457 out:
 458         close(fd);
 459 }
 460
 461 static int strip_rcs_crap(char *version)
 462 {
 463         unsigned int len, full_len;
 464
 465         if (strncmp(version, "$Revision", strlen("$Revision")) != 0)
 466                 return 0;
 467
 468         /* Space for version string follows. */
 469         full_len = strlen(version) + strlen(version + strlen(version) + 1) + 2;
 470
 471         /* Move string to start with version number: prefix will be
 472          * $Revision$ or $Revision: */
 473         len = strlen("$Revision");
 474         if (version[len] == ':' || version[len] == '$')
 475                 len++;
 476         while (isspace(version[len]))
 477                 len++;
 478         memmove(version, version+len, full_len-len);
 479         full_len -= len;
 480
 481         /* Preserve up to next whitespace. */
 482         len = 0;
 483         while (version[len] && !isspace(version[len]))
 484                 len++;
 485         memmove(version + len, version + strlen(version),
 486                 full_len - strlen(version));
 487         return 1;
 488 }
 489
 490 /* Clean up RCS-style version numbers. */
 491 void maybe_frob_rcs_version(const char *modfilename,
 492                             char *version,
 493                             void *modinfo,
 494                             unsigned long version_offset)
 495 {
 496         if (strip_rcs_crap(version))
 497                 write_version(modfilename, version, version_offset);
 498 }