git.marmaro.de Git - mmh/blob - uip/mhcachesbr.c

   1 /*
   2 ** mhcachesbr.c -- routines to manipulate the MIME content cache
   3 **
   4 ** This code is Copyright (c) 2002, by the authors of nmh.  See the
   5 ** COPYRIGHT file in the root directory of the nmh distribution for
   6 ** complete copyright information.
   7 */
   8
   9 #include <h/mh.h>
  10 #include <fcntl.h>
  11 #include <h/signals.h>
  12 #include <h/md5.h>
  13 #include <errno.h>
  14 #include <setjmp.h>
  15 #include <signal.h>
  16 #include <h/mts.h>
  17 #include <h/tws.h>
  18 #include <h/mime.h>
  19 #include <h/mhparse.h>
  20 #include <h/mhcachesbr.h>
  21 #include <h/utils.h>
  22
  23 #ifdef TIME_WITH_SYS_TIME
  24 # include <sys/time.h>
  25 # include <time.h>
  26 #else
  27 # ifdef TM_IN_SYS_TIME
  28 #  include <sys/time.h>
  29 # else
  30 #  include <time.h>
  31 # endif
  32 #endif
  33
  34 #ifdef HAVE_SYS_WAIT_H
  35 # include <sys/wait.h>
  36 #endif
  37
  38 extern int debugsw;
  39
  40 extern pid_t xpid;  /* mhshowsbr.c or mhbuildsbr.c */
  41
  42 /* cache policies */
  43 int rcachesw = CACHE_ASK;
  44 int wcachesw = CACHE_ASK;
  45
  46 /*
  47 ** Location of public and private cache.  These must
  48 ** be set before these routines are called.
  49 */
  50 char *cache_public;
  51 char *cache_private;
  52
  53
  54 /* mhparse.c (OR) mhbuildsbr.c */
  55 int pidcheck (int);
  56
  57 /* mhmisc.c */
  58 int part_ok(CT, int);
  59 int type_ok(CT, int);
  60 int make_intermediates(char *);
  61 void content_error(char *, CT, char *, ...);
  62 void flush_errors(void);
  63
  64 /*
  65 ** prototypes
  66 */
  67 void cache_all_messages(CT *);
  68 int find_cache(CT, int, int *, char *, char *, int);
  69
  70 /*
  71 ** static prototypes
  72 */
  73 static void cache_content(CT);
  74 static int find_cache_aux(int, char *, char *, char *, int);
  75 static int find_cache_aux2(char *, char *, char *, int);
  76
  77
  78 /*
  79 ** Top level entry point to cache content
  80 ** from a group of messages
  81 */
  82
  83 void
  84 cache_all_messages(CT *cts)
  85 {
  86         CT ct, *ctp;
  87
  88         for (ctp = cts; *ctp; ctp++) {
  89                 ct = *ctp;
  90                 if (type_ok(ct, 1)) {
  91                         cache_content(ct);
  92                         if (ct->c_fp) {
  93                                 fclose(ct->c_fp);
  94                                 ct->c_fp = NULL;
  95                         }
  96                         if (ct->c_ceclosefnx)
  97                                 (*ct->c_ceclosefnx) (ct);
  98                 }
  99         }
 100         flush_errors();
 101 }
 102
 103
 104 /*
 105 ** Entry point to cache content from external sources.
 106 */
 107
 108 static void
 109 cache_content(CT ct)
 110 {
 111         int cachetype;
 112         char *file, cachefile[BUFSIZ];
 113         CE ce = ct->c_cefile;
 114
 115         if (!ct->c_id) {
 116                 advise(NULL, "no %s: field in %s", ID_FIELD, ct->c_file);
 117                 return;
 118         }
 119
 120         if (!ce) {
 121                 advise(NULL, "unable to decode %s", ct->c_file);
 122                 return;
 123         }
 124
 125 /* THIS NEEDS TO BE FIXED */
 126 #if 0
 127         if (ct->c_ceopenfnx == openMail) {
 128                 advise(NULL, "a radish may no know Greek, but I do...");
 129                 return;
 130         }
 131 #endif
 132
 133         if (find_cache(NULL, wcachesw != CACHE_NEVER ? wcachesw : CACHE_ASK,
 134                         &cachetype, ct->c_id, cachefile, sizeof(cachefile))
 135                         == NOTOK) {
 136                 advise(NULL, "unable to cache %s's contents", ct->c_file);
 137                 return;
 138         }
 139         if (wcachesw != CACHE_NEVER && wcachesw != CACHE_ASK) {
 140                 fflush(stdout);
 141                 fprintf(stderr, "caching message %s as file %s\n", ct->c_file,
 142                                 cachefile);
 143         }
 144
 145         if (ce->ce_file) {
 146                 int mask = umask(cachetype ? ~m_gmprot() : 0222);
 147                 FILE *fp;
 148
 149                 if (debugsw)
 150                         fprintf(stderr, "caching by copying %s...\n",
 151                                         ce->ce_file);
 152
 153                 file = NULL;
 154                 if ((*ct->c_ceopenfnx) (ct, &file) == NOTOK)
 155                         goto reset_umask;
 156
 157                 if ((fp = fopen(cachefile, "w"))) {
 158                         int cc;
 159                         char buffer[BUFSIZ];
 160                         FILE *gp = ce->ce_fp;
 161
 162                         fseek(gp, 0L, SEEK_SET);
 163
 164                         while ((cc = fread(buffer, sizeof(*buffer),
 165                                 sizeof(buffer), gp)) > 0)
 166                                 fwrite(buffer, sizeof(*buffer), cc, fp);
 167                         fflush(fp);
 168
 169                         if (ferror(gp)) {
 170                                 admonish(ce->ce_file, "error reading");
 171                                 unlink(cachefile);
 172                         } else {
 173                                 if (ferror(fp)) {
 174                                         admonish(cachefile, "error writing");
 175                                         unlink(cachefile);
 176                                 }
 177                         }
 178                         fclose(fp);
 179                 } else
 180                         content_error(cachefile, ct,
 181                                         "unable to fopen for writing");
 182 reset_umask:
 183                 umask(mask);
 184         } else {
 185                 if (debugsw)
 186                         fprintf(stderr, "in place caching...\n");
 187
 188                 file = cachefile;
 189                 if ((*ct->c_ceopenfnx) (ct, &file) != NOTOK)
 190                         chmod(cachefile, cachetype ? m_gmprot() : 0444);
 191         }
 192 }
 193
 194
 195 int
 196 find_cache(CT ct, int policy, int *writing, char *id, char *buffer, int buflen)
 197 {
 198         int status = NOTOK;
 199
 200         if (id == NULL)
 201                 return NOTOK;
 202         id = trimcpy(id);
 203
 204         if (debugsw)
 205                 fprintf(stderr, "find_cache %s(%d) %s %s\n",
 206                                 caches[policy].sw, policy,
 207                                 writing ? "writing" : "reading", id);
 208
 209         switch (policy) {
 210         case CACHE_NEVER:
 211         default:
 212                 break;
 213
 214         case CACHE_ASK:
 215         case CACHE_PUBLIC:
 216                 if (cache_private && !writing &&
 217                                 find_cache_aux(writing ? 2 : 0,
 218                                 cache_private, id, buffer, buflen) == OK) {
 219                         if (access(buffer, R_OK) != NOTOK) {
 220 got_private:
 221                                 if (writing)
 222                                         *writing = 1;
 223 got_it:
 224                                 status = OK;
 225                                 break;
 226                         }
 227                 }
 228                 if (cache_public && find_cache_aux(writing ? 1 : 0,
 229                                 cache_public, id, buffer, buflen) == OK) {
 230                         if (writing || access(buffer, R_OK) != NOTOK) {
 231                                 if (writing)
 232                                         *writing = 0;
 233                                 goto got_it;
 234                         }
 235                 }
 236                 break;
 237
 238         case CACHE_PRIVATE:
 239                 if (cache_private && find_cache_aux(writing ? 2 : 0,
 240                                 cache_private, id, buffer, buflen) == OK) {
 241                         if (writing || access(buffer, R_OK) != NOTOK)
 242                                 goto got_private;
 243                 }
 244                 break;
 245
 246         }
 247
 248         if (status == OK && policy == CACHE_ASK) {
 249                 int len, buflen;
 250                 char *bp, query[BUFSIZ];
 251
 252                 if (xpid) {
 253                         if (xpid < 0)
 254                                 xpid = -xpid;
 255                         pidcheck(pidwait(xpid, NOTOK));
 256                         xpid = 0;
 257                 }
 258
 259                 /* Get buffer ready to go */
 260                 bp = query;
 261                 buflen = sizeof(query);
 262
 263                 /* Now, construct query */
 264                 if (writing) {
 265                         snprintf(bp, buflen, "Make cached, publically-accessible copy");
 266                 } else {
 267                         struct stat st;
 268
 269                         snprintf(bp, buflen, "Use cached copy");
 270                         len = strlen(bp);
 271                         bp += len;
 272                         buflen -= len;
 273
 274                         if (ct->c_partno) {
 275                                 snprintf(bp, buflen, " of content %s",
 276                                                 ct->c_partno);
 277                                 len = strlen(bp);
 278                                 bp += len;
 279                                 buflen -= len;
 280                         }
 281
 282                         stat(buffer, &st);
 283                         snprintf(bp, buflen, " (size %lu octets)",
 284                                 (unsigned long) st.st_size);
 285                 }
 286                 len = strlen(bp);
 287                 bp += len;
 288                 buflen -= len;
 289
 290                 snprintf(bp, buflen, "\n    in file %s? ", buffer);
 291
 292                 /* Now, check answer */
 293                 if (!getanswer(query))
 294                         status = NOTOK;
 295         }
 296
 297         if (status == OK && writing) {
 298                 if (*writing && strchr(buffer, '/'))
 299                         make_intermediates(buffer);
 300                 unlink(buffer);
 301         }
 302
 303         free(id);
 304         return status;
 305 }
 306
 307
 308 static int
 309 find_cache_aux(int writing, char *directory, char *id, char *buffer,
 310                 int buflen)
 311 {
 312         int mask, usemap;
 313         char mapfile[BUFSIZ], mapname[BUFSIZ];
 314         FILE *fp;
 315         static int partno, pid;
 316         static time_t clock = 0;
 317
 318 #ifdef BSD42
 319         usemap = strchr(id, '/') ? 1 : 0;
 320 #else
 321         usemap = 1;
 322 #endif
 323
 324         if (debugsw)
 325                 fprintf(stderr, "find_cache_aux %s usemap=%d\n",
 326                                 directory, usemap);
 327
 328         snprintf(mapfile, sizeof(mapfile), "%s/cache.map", directory);
 329         if (find_cache_aux2(mapfile, id, mapname, sizeof(mapname)) == OK)
 330                 goto done_map;
 331
 332         if (!writing) {
 333                 if (usemap)
 334                         return NOTOK;
 335
 336 use_raw:
 337                 snprintf(buffer, buflen, "%s/%s", directory, id);
 338                 return OK;
 339         }
 340
 341         if (!usemap && access(mapfile, W_OK) == NOTOK)
 342                 goto use_raw;
 343
 344         if (clock != 0) {
 345                 time_t now;
 346
 347                 time(&now);
 348                 if (now > clock)
 349                         clock = 0;
 350         } else {
 351                 pid = getpid();
 352         }
 353
 354         if (clock == 0) {
 355                 time(&clock);
 356                 partno = 0;
 357         } else {
 358                 if (partno > 0xff) {
 359                         clock++;
 360                         partno = 0;
 361                 }
 362         }
 363
 364         snprintf(mapname, sizeof(mapname), "%08x%04x%02x",
 365                         (unsigned int) (clock & 0xffffffff),
 366                         (unsigned int) (pid & 0xffff),
 367                         (unsigned int) (partno++ & 0xff));
 368
 369         if (debugsw)
 370                 fprintf(stderr, "creating mapping %s->%s\n", mapname, id);
 371
 372         make_intermediates(mapfile);
 373         mask = umask(writing == 2 ? 0077 : 0);
 374         if (!(fp = lkfopen(mapfile, "a")) && errno == ENOENT) {
 375                 int fd;
 376
 377                 if ((fd = creat(mapfile, 0666)) != NOTOK) {
 378                         close(fd);
 379                         fp = lkfopen(mapfile, "a");
 380                 }
 381         }
 382         umask(mask);
 383         if (!fp)
 384                 return NOTOK;
 385         fprintf(fp, "%s: %s\n", mapname, id);
 386         lkfclose(fp, mapfile);
 387
 388 done_map:
 389         if (*mapname == '/')
 390                 strncpy(buffer, mapname, buflen);
 391         else
 392                 snprintf(buffer, buflen, "%s/%s", directory, mapname);
 393         if (debugsw)
 394                 fprintf(stderr, "use %s\n", buffer);
 395
 396         return OK;
 397 }
 398
 399
 400 static int
 401 find_cache_aux2(char *mapfile, char *id, char *mapname, int namelen)
 402 {
 403         int state;
 404         char buf[BUFSIZ], name[NAMESZ];
 405         FILE *fp;
 406
 407         if (!(fp = lkfopen(mapfile, "r")))
 408                 return NOTOK;
 409
 410         for (state = FLD;;) {
 411                 int result;
 412                 char *cp, *dp;
 413
 414                 switch (state = m_getfld(state, name, buf, sizeof(buf), fp)) {
 415                 case FLD:
 416                 case FLDPLUS:
 417                 case FLDEOF:
 418                         strncpy(mapname, name, namelen);
 419                         if (state != FLDPLUS)
 420                                 cp = buf;
 421                         else {
 422                                 cp = getcpy(buf);
 423                                 while (state == FLDPLUS) {
 424                                         state = m_getfld(state, name, buf,
 425                                                         sizeof(buf), fp);
 426                                         cp = add(buf, cp);
 427                                 }
 428                         }
 429                         dp = trimcpy(cp);
 430                         if (cp != buf)
 431                                 free(cp);
 432                         if (debugsw)
 433                                 fprintf(stderr, "compare %s to %s <- %s\n",
 434                                                 id, dp, mapname);
 435                         result = strcmp(id, dp);
 436                         free(dp);
 437                         if (result == 0) {
 438                                 lkfclose(fp, mapfile);
 439                                 return OK;
 440                         }
 441                         if (state != FLDEOF)
 442                                 continue;
 443                         /* else fall... */
 444
 445                 case BODY:
 446                 case BODYEOF:
 447                 case FILEEOF:
 448                 default:
 449                         break;
 450                 }
 451                 break;
 452         }
 453
 454         lkfclose(fp, mapfile);
 455         return NOTOK;
 456 }