root/scripts/mod/sumversion.c

DEFINITIONS

1. lshift
2. F
3. G
4. H
5. le32_to_cpu_array
6. cpu_to_le32_array
7. md4_transform
8. md4_transform_helper
9. md4_init
10. md4_update
11. md4_final_ascii
12. add_char
13. parse_string
14. parse_comment
15. parse_file
16. is_static_library
17. parse_source_files
18. get_src_version
19. write_version
20. strip_rcs_crap
21. maybe_frob_rcs_version

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