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 <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, ARRAY_SIZE(ctx->block));
 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, ARRAY_SIZE(mctx->hash));
 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 = read_text_file(fname);
 262         len = strlen(file);
 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         free(file);
 290         return 1;
 291 }
 292 /* Check whether the file is a static library or not */
 293 static bool is_static_library(const char *objfile)
 294 {
 295         int len = strlen(objfile);
 296
 297         return objfile[len - 2] == '.' && objfile[len - 1] == 'a';
 298 }
 299
 300 /* We have dir/file.o.  Open dir/.file.o.cmd, look for source_ and deps_ line
 301  * to figure out source files. */
 302 static int parse_source_files(const char *objfile, struct md4_ctx *md)
 303 {
 304         char *cmd, *file, *line, *dir, *pos;
 305         const char *base;
 306         int dirlen, ret = 0, check_files = 0;
 307
 308         cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd")));
 309
 310         base = strrchr(objfile, '/');
 311         if (base) {
 312                 base++;
 313                 dirlen = base - objfile;
 314                 sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base);
 315         } else {
 316                 dirlen = 0;
 317                 sprintf(cmd, ".%s.cmd", objfile);
 318         }
 319         dir = NOFAIL(malloc(dirlen + 1));
 320         strncpy(dir, objfile, dirlen);
 321         dir[dirlen] = '\0';
 322
 323         file = read_text_file(cmd);
 324
 325         pos = file;
 326
 327         /* Sum all files in the same dir or subdirs. */
 328         while ((line = get_line(&pos))) {
 329                 char* p;
 330
 331                 /* trim the leading spaces away */
 332                 while (isspace(*line))
 333                         line++;
 334                 p = line;
 335
 336                 if (strncmp(line, "source_", sizeof("source_")-1) == 0) {
 337                         p = strrchr(line, ' ');
 338                         if (!p) {
 339                                 warn("malformed line: %s\n", line);
 340                                 goto out_file;
 341                         }
 342                         p++;
 343                         if (!parse_file(p, md)) {
 344                                 warn("could not open %s: %s\n",
 345                                      p, strerror(errno));
 346                                 goto out_file;
 347                         }
 348                         continue;
 349                 }
 350                 if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {
 351                         check_files = 1;
 352                         continue;
 353                 }
 354                 if (!check_files)
 355                         continue;
 356
 357                 /* Continue until line does not end with '\' */
 358                 if ( *(p + strlen(p)-1) != '\\')
 359                         break;
 360                 /* Terminate line at first space, to get rid of final ' \' */
 361                 while (*p) {
 362                         if (isspace(*p)) {
 363                                 *p = '\0';
 364                                 break;
 365                         }
 366                         p++;
 367                 }
 368
 369                 /* Check if this file is in same dir as objfile */
 370                 if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) {
 371                         if (!parse_file(line, md)) {
 372                                 warn("could not open %s: %s\n",
 373                                      line, strerror(errno));
 374                                 goto out_file;
 375                         }
 376
 377                 }
 378
 379         }
 380
 381         /* Everyone parsed OK */
 382         ret = 1;
 383 out_file:
 384         free(file);
 385         free(dir);
 386         free(cmd);
 387         return ret;
 388 }
 389
 390 /* Calc and record src checksum. */
 391 void get_src_version(const char *modname, char sum[], unsigned sumlen)
 392 {
 393         char *buf;
 394         struct md4_ctx md;
 395         char *fname;
 396         char filelist[PATH_MAX + 1];
 397
 398         /* objects for a module are listed in the first line of *.mod file. */
 399         snprintf(filelist, sizeof(filelist), "%s.mod", modname);
 400
 401         buf = read_text_file(filelist);
 402
 403         md4_init(&md);
 404         while ((fname = strsep(&buf, "\n"))) {
 405                 if (!*fname)
 406                         continue;
 407                 if (!(is_static_library(fname)) &&
 408                                 !parse_source_files(fname, &md))
 409                         goto free;
 410         }
 411
 412         md4_final_ascii(&md, sum, sumlen);
 413 free:
 414         free(buf);
 415 }