bin/cpdup/md5.c

   1 /*-
   2  * MD5.C
   3  *
   4  * (c) Copyright 1997-1999 by Matthew Dillon and Dima Ruban.  Permission to
   5  *     use and distribute based on the FreeBSD copyright.  Supplied as-is,
   6  *     USE WITH EXTREME CAUTION.
   7  *
   8  * $DragonFly: src/bin/cpdup/md5.c,v 1.3 2008/11/10 14:30:02 swildner Exp $
   9  */
  10
  11 #include "cpdup.h"
  12
  13 typedef struct MD5Node {
  14     struct MD5Node *md_Next;
  15     char *md_Name;
  16     char *md_Code;
  17     int md_Accessed;
  18 } MD5Node;
  19
  20 static MD5Node *md5_lookup(const char *sfile);
  21 static void md5_cache(const char *spath, int sdirlen);
  22 static char *doMD5File(const char *filename, char *buf, int is_target);
  23
  24 static char *MD5SCache;         /* cache source directory name */
  25 static MD5Node *MD5Base;
  26 static int MD5SCacheDirLen;
  27 static int MD5SCacheDirty;
  28
  29 void
  30 md5_flush(void)
  31 {
  32     if (MD5SCacheDirty && MD5SCache) {
  33         FILE *fo;
  34
  35         if ((fo = fopen(MD5SCache, "w")) != NULL) {
  36             MD5Node *node;
  37
  38             for (node = MD5Base; node; node = node->md_Next) {
  39                 if (node->md_Accessed && node->md_Code) {
  40                     fprintf(fo, "%s %zu %s\n",
  41                         node->md_Code,
  42                         strlen(node->md_Name),
  43                         node->md_Name
  44                     );
  45                 }
  46             }
  47             fclose(fo);
  48         }
  49     }
  50
  51     MD5SCacheDirty = 0;
  52
  53     if (MD5SCache) {
  54         MD5Node *node;
  55
  56         while ((node = MD5Base) != NULL) {
  57             MD5Base = node->md_Next;
  58
  59             if (node->md_Code)
  60                 free(node->md_Code);
  61             if (node->md_Name)
  62                 free(node->md_Name);
  63             free(node);
  64         }
  65         free(MD5SCache);
  66         MD5SCache = NULL;
  67     }
  68 }
  69
  70 static void
  71 md5_cache(const char *spath, int sdirlen)
  72 {
  73     FILE *fi;
  74
  75     /*
  76      * Already cached
  77      */
  78
  79     if (
  80         MD5SCache &&
  81         sdirlen == MD5SCacheDirLen &&
  82         strncmp(spath, MD5SCache, sdirlen) == 0
  83     ) {
  84         return;
  85     }
  86
  87     /*
  88      * Different cache, flush old cache
  89      */
  90
  91     if (MD5SCache != NULL)
  92         md5_flush();
  93
  94     /*
  95      * Create new cache
  96      */
  97
  98     MD5SCacheDirLen = sdirlen;
  99     MD5SCache = mprintf("%*.*s%s", sdirlen, sdirlen, spath, MD5CacheFile);
 100
 101     if ((fi = fopen(MD5SCache, "r")) != NULL) {
 102         MD5Node **pnode = &MD5Base;
 103         int c;
 104
 105         c = fgetc(fi);
 106         while (c != EOF) {
 107             MD5Node *node = *pnode = malloc(sizeof(MD5Node));
 108             char *s;
 109             int nlen;
 110
 111             nlen = 0;
 112
 113             if (pnode == NULL || node == NULL) {
 114                 fprintf(stderr, "out of memory\n");
 115                 exit(EXIT_FAILURE);
 116             }
 117
 118             bzero(node, sizeof(MD5Node));
 119             node->md_Code = fextract(fi, -1, &c, ' ');
 120             node->md_Accessed = 1;
 121             if ((s = fextract(fi, -1, &c, ' ')) != NULL) {
 122                 nlen = strtol(s, NULL, 0);
 123                 free(s);
 124             }
 125             /*
 126              * extracting md_Name - name may contain embedded control
 127              * characters.
 128              */
 129             CountSourceReadBytes += nlen+1;
 130             node->md_Name = fextract(fi, nlen, &c, EOF);
 131             if (c != '\n') {
 132                 fprintf(stderr, "Error parsing MD5 Cache: %s (%c)\n", MD5SCache, c);
 133                 while (c != EOF && c != '\n')
 134                     c = fgetc(fi);
 135             }
 136             if (c != EOF)
 137                 c = fgetc(fi);
 138             pnode = &node->md_Next;
 139         }
 140         fclose(fi);
 141     }
 142 }
 143
 144 /*
 145  * md5_lookup:  lookup/create md5 entry
 146  */
 147
 148 static MD5Node *
 149 md5_lookup(const char *sfile)
 150 {
 151     MD5Node **pnode;
 152     MD5Node *node;
 153
 154     for (pnode = &MD5Base; (node = *pnode) != NULL; pnode = &node->md_Next) {
 155         if (strcmp(sfile, node->md_Name) == 0) {
 156             break;
 157         }
 158     }
 159     if (node == NULL) {
 160
 161         if ((node = *pnode = malloc(sizeof(MD5Node))) == NULL) {
 162                 fprintf(stderr,"out of memory\n");
 163                 exit(EXIT_FAILURE);
 164         }
 165
 166         bzero(node, sizeof(MD5Node));
 167         node->md_Name = strdup(sfile);
 168     }
 169     node->md_Accessed = 1;
 170     return(node);
 171 }
 172
 173 /*
 174  * md5_check:  check MD5 against file
 175  *
 176  *      Return -1 if check failed
 177  *      Return 0  if check succeeded
 178  *
 179  * dpath can be NULL, in which case we are force-updating
 180  * the source MD5.
 181  */
 182 int
 183 md5_check(const char *spath, const char *dpath)
 184 {
 185     const char *sfile;
 186     char *dcode;
 187     int sdirlen;
 188     int r;
 189     MD5Node *node;
 190
 191     r = -1;
 192
 193     if ((sfile = strrchr(spath, '/')) != NULL)
 194         ++sfile;
 195     else
 196         sfile = spath;
 197     sdirlen = sfile - spath;
 198
 199     md5_cache(spath, sdirlen);
 200
 201     node = md5_lookup(sfile);
 202
 203     /*
 204      * If dpath == NULL, we are force-updating the source .MD5* files
 205      */
 206
 207     if (dpath == NULL) {
 208         char *scode = doMD5File(spath, NULL, 0);
 209
 210         r = 0;
 211         if (node->md_Code == NULL) {
 212             r = -1;
 213             node->md_Code = scode;
 214             MD5SCacheDirty = 1;
 215         } else if (strcmp(scode, node->md_Code) != 0) {
 216             r = -1;
 217             free(node->md_Code);
 218             node->md_Code = scode;
 219             MD5SCacheDirty = 1;
 220         } else {
 221             free(scode);
 222         }
 223         return(r);
 224     }
 225
 226     /*
 227      * Otherwise the .MD5* file is used as a cache.
 228      */
 229
 230     if (node->md_Code == NULL) {
 231         node->md_Code = doMD5File(spath, NULL, 0);
 232         MD5SCacheDirty = 1;
 233     }
 234
 235     dcode = doMD5File(dpath, NULL, 1);
 236     if (dcode) {
 237         if (strcmp(node->md_Code, dcode) == 0) {
 238             r = 0;
 239         } else {
 240             char *scode = doMD5File(spath, NULL, 0);
 241
 242             if (strcmp(node->md_Code, scode) == 0) {
 243                     free(scode);
 244             } else {
 245                     free(node->md_Code);
 246                     node->md_Code = scode;
 247                     MD5SCacheDirty = 1;
 248                     if (strcmp(node->md_Code, dcode) == 0)
 249                         r = 0;
 250             }
 251         }
 252         free(dcode);
 253     }
 254     return(r);
 255 }
 256
 257 char *
 258 doMD5File(const char *filename, char *buf, int is_target)
 259 {
 260     if (SummaryOpt) {
 261         struct stat st;
 262         if (stat(filename, &st) == 0) {
 263             uint64_t size = st.st_size;
 264             if (is_target)
 265                     CountTargetReadBytes += size;
 266             else
 267                     CountSourceReadBytes += size;
 268         }
 269     }
 270     return MD5File(filename, buf);
 271 }
 272