src/src/mime.c

   1 /* $Cambridge: exim/src/src/mime.c,v 1.3 2004/12/17 14:52:44 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004 */
   8 /* License: GPL */
   9
  10 #include "exim.h"
  11 #ifdef WITH_CONTENT_SCAN
  12 #include "mime.h"
  13 #include <sys/stat.h>
  14
  15 FILE *mime_stream = NULL;
  16 uschar *mime_current_boundary = NULL;
  17
  18 /*************************************************
  19 * set MIME anomaly level + text                  *
  20 *************************************************/
  21
  22 /* Small wrapper to set the two expandables which
  23    give info on detected "problems" in MIME
  24    encodings. Those are defined in mime.h. */
  25
  26 void mime_set_anomaly(int level, char *text) {
  27   mime_anomaly_level = level;
  28   mime_anomaly_text = US text;
  29 }
  30
  31
  32 /*************************************************
  33 * decode quoted-printable chars                  *
  34 *************************************************/
  35
  36 /* gets called when we hit a =
  37    returns: new pointer position
  38    result code in c:
  39           -2 - decode error
  40           -1 - soft line break, no char
  41            0-255 - char to write
  42 */
  43
  44 unsigned int mime_qp_hstr_i(uschar *cptr) {
  45   unsigned int i, j = 0;
  46   while (cptr && *cptr && isxdigit(*cptr)) {
  47     i = *cptr++ - '0';
  48     if (9 < i) i -= 7;
  49     j <<= 4;
  50     j |= (i & 0x0f);
  51   }
  52   return(j);
  53 }
  54
  55 uschar *mime_decode_qp_char(uschar *qp_p,int *c) {
  56   uschar hex[] = {0,0,0};
  57   int nan = 0;
  58   uschar *initial_pos = qp_p;
  59
  60   /* advance one char */
  61   qp_p++;
  62
  63   REPEAT_FIRST:
  64   if ( (*qp_p == '\t') || (*qp_p == ' ') || (*qp_p == '\r') )  {
  65     /* tab or whitespace may follow
  66        just ignore it, but remember
  67        that this is not a valid hex
  68        encoding any more */
  69     nan = 1;
  70     qp_p++;
  71     goto REPEAT_FIRST;
  72   }
  73   else if ( (('0' <= *qp_p) && (*qp_p <= '9')) || (('A' <= *qp_p) && (*qp_p <= 'F'))  || (('a' <= *qp_p) && (*qp_p <= 'f')) ) {
  74     /* this is a valid hex char, if nan is unset */
  75     if (nan) {
  76       /* this is illegal */
  77       *c = -2;
  78       return initial_pos;
  79     }
  80     else {
  81       hex[0] = *qp_p;
  82       qp_p++;
  83     };
  84   }
  85   else if (*qp_p == '\n') {
  86     /* hit soft line break already, continue */
  87     *c = -1;
  88     return qp_p;
  89   }
  90   else {
  91     /* illegal char here */
  92     *c = -2;
  93     return initial_pos;
  94   };
  95
  96   if ( (('0' <= *qp_p) && (*qp_p <= '9')) || (('A' <= *qp_p) && (*qp_p <= 'F')) || (('a' <= *qp_p) && (*qp_p <= 'f')) ) {
  97     if (hex[0] > 0) {
  98       hex[1] = *qp_p;
  99       /* do hex conversion */
 100       *c = mime_qp_hstr_i(hex);
 101       qp_p++;
 102       return qp_p;
 103     }
 104     else {
 105       /* huh ? */
 106       *c = -2;
 107       return initial_pos;
 108     };
 109   }
 110   else {
 111     /* illegal char */
 112     *c = -2;
 113     return initial_pos;
 114   };
 115 }
 116
 117
 118 uschar *mime_parse_line(uschar *buffer, uschar *encoding, int *num_decoded) {
 119   uschar *data = NULL;
 120
 121   data = (uschar *)malloc(Ustrlen(buffer)+2);
 122
 123   if (encoding == NULL) {
 124     /* no encoding type at all */
 125     NO_DECODING:
 126     memcpy(data, buffer, Ustrlen(buffer));
 127     data[(Ustrlen(buffer))] = 0;
 128     *num_decoded = Ustrlen(data);
 129     return data;
 130   }
 131   else if (Ustrcmp(encoding,"base64") == 0) {
 132     uschar *p = buffer;
 133     int offset = 0;
 134
 135     /* ----- BASE64 ---------------------------------------------------- */
 136     /* NULL out '\r' and '\n' chars */
 137     while (Ustrrchr(p,'\r') != NULL) {
 138       *(Ustrrchr(p,'\r')) = '\0';
 139     };
 140     while (Ustrrchr(p,'\n') != NULL) {
 141       *(Ustrrchr(p,'\n')) = '\0';
 142     };
 143
 144     while (*(p+offset) != '\0') {
 145       /* hit illegal char ? */
 146       if (mime_b64[*(p+offset)] == 128) {
 147         mime_set_anomaly(MIME_ANOMALY_BROKEN_BASE64);
 148         offset++;
 149       }
 150       else {
 151         *p = mime_b64[*(p+offset)];
 152         p++;
 153       };
 154     };
 155     *p = 255;
 156
 157     /* line is translated, start bit shifting */
 158     p = buffer;
 159     *num_decoded = 0;
 160     while(*p != 255) {
 161       uschar tmp_c;
 162
 163       /* byte 0 ---------------------- */
 164       if (*(p+1) == 255) {
 165         mime_set_anomaly(MIME_ANOMALY_BROKEN_BASE64);
 166         break;
 167       }
 168       data[(*num_decoded)] = *p;
 169       data[(*num_decoded)] <<= 2;
 170       tmp_c = *(p+1);
 171       tmp_c >>= 4;
 172       data[(*num_decoded)] |= tmp_c;
 173       (*num_decoded)++;
 174       p++;
 175       /* byte 1 ---------------------- */
 176       if (*(p+1) == 255) {
 177         mime_set_anomaly(MIME_ANOMALY_BROKEN_BASE64);
 178         break;
 179       }
 180       data[(*num_decoded)] = *p;
 181       data[(*num_decoded)] <<= 4;
 182       tmp_c = *(p+1);
 183       tmp_c >>= 2;
 184       data[(*num_decoded)] |= tmp_c;
 185       (*num_decoded)++;
 186       p++;
 187       /* byte 2 ---------------------- */
 188       if (*(p+1) == 255) {
 189         mime_set_anomaly(MIME_ANOMALY_BROKEN_BASE64);
 190         break;
 191       }
 192       data[(*num_decoded)] = *p;
 193       data[(*num_decoded)] <<= 6;
 194       data[(*num_decoded)] |= *(p+1);
 195       (*num_decoded)++;
 196       p+=2;
 197
 198     };
 199     return data;
 200     /* ----------------------------------------------------------------- */
 201   }
 202   else if (Ustrcmp(encoding,"quoted-printable") == 0) {
 203     uschar *p = buffer;
 204
 205     /* ----- QP -------------------------------------------------------- */
 206     *num_decoded = 0;
 207     while (*p != 0) {
 208       if (*p == '=') {
 209         int decode_qp_result;
 210
 211         p = mime_decode_qp_char(p,&decode_qp_result);
 212
 213         if (decode_qp_result == -2) {
 214           /* Error from decoder. p is unchanged. */
 215           mime_set_anomaly(MIME_ANOMALY_BROKEN_QP);
 216           data[(*num_decoded)] = '=';
 217           (*num_decoded)++;
 218           p++;
 219         }
 220         else if (decode_qp_result == -1) {
 221           break;
 222         }
 223         else if (decode_qp_result >= 0) {
 224           data[(*num_decoded)] = decode_qp_result;
 225           (*num_decoded)++;
 226         };
 227       }
 228       else {
 229         data[(*num_decoded)] = *p;
 230         (*num_decoded)++;
 231         p++;
 232       };
 233     };
 234     return data;
 235     /* ----------------------------------------------------------------- */
 236   }
 237   /* unknown encoding type, just dump as-is */
 238   else goto NO_DECODING;
 239 }
 240
 241
 242 FILE *mime_get_decode_file(uschar *pname, uschar *fname) {
 243   FILE *f = NULL;
 244   uschar *filename;
 245
 246   filename = (uschar *)malloc(2048);
 247
 248   if ((pname != NULL) && (fname != NULL)) {
 249     snprintf(CS filename, 2048, "%s/%s", pname, fname);
 250     f = fopen(CS filename,"w+");
 251   }
 252   else if (pname == NULL) {
 253     f = fopen(CS fname,"w+");
 254   }
 255   else if (fname == NULL) {
 256     int file_nr = 0;
 257     int result = 0;
 258
 259     /* must find first free sequential filename */
 260     do {
 261       struct stat mystat;
 262       snprintf(CS filename,2048,"%s/%s-%05u", pname, message_id, file_nr);
 263       file_nr++;
 264       /* security break */
 265       if (file_nr >= 1024)
 266         break;
 267       result = stat(CS filename,&mystat);
 268     }
 269     while(result != -1);
 270     f = fopen(CS filename,"w+");
 271   };
 272
 273   /* set expansion variable */
 274   mime_decoded_filename = filename;
 275
 276   return f;
 277 }
 278
 279
 280 int mime_decode(uschar **listptr) {
 281   int sep = 0;
 282   uschar *list = *listptr;
 283   uschar *option;
 284   uschar option_buffer[1024];
 285   uschar decode_path[1024];
 286   FILE *decode_file = NULL;
 287   uschar *buffer = NULL;
 288   long f_pos = 0;
 289   unsigned int size_counter = 0;
 290
 291   if (mime_stream == NULL)
 292     return FAIL;
 293
 294   f_pos = ftell(mime_stream);
 295
 296   /* build default decode path (will exist since MBOX must be spooled up) */
 297   snprintf(CS decode_path,1024,"%s/scan/%s",spool_directory,message_id);
 298
 299   /* reserve a line buffer to work in */
 300   buffer = (uschar *)malloc(MIME_MAX_LINE_LENGTH+1);
 301   if (buffer == NULL) {
 302     log_write(0, LOG_PANIC,
 303                  "decode ACL condition: can't allocate %d bytes of memory.", MIME_MAX_LINE_LENGTH+1);
 304     return DEFER;
 305   };
 306
 307   /* try to find 1st option */
 308   if ((option = string_nextinlist(&list, &sep,
 309                                   option_buffer,
 310                                   sizeof(option_buffer))) != NULL) {
 311
 312     /* parse 1st option */
 313     if ( (Ustrcmp(option,"false") == 0) || (Ustrcmp(option,"0") == 0) ) {
 314       /* explicitly no decoding */
 315       return FAIL;
 316     };
 317
 318     if (Ustrcmp(option,"default") == 0) {
 319       /* explicit default path + file names */
 320       goto DEFAULT_PATH;
 321     };
 322
 323     if (option[0] == '/') {
 324       struct stat statbuf;
 325
 326       memset(&statbuf,0,sizeof(statbuf));
 327
 328       /* assume either path or path+file name */
 329       if ( (stat(CS option, &statbuf) == 0) && S_ISDIR(statbuf.st_mode) )
 330         /* is directory, use it as decode_path */
 331         decode_file = mime_get_decode_file(option, NULL);
 332       else
 333         /* does not exist or is a file, use as full file name */
 334         decode_file = mime_get_decode_file(NULL, option);
 335     }
 336     else
 337       /* assume file name only, use default path */
 338       decode_file = mime_get_decode_file(decode_path, option);
 339   }
 340   else
 341     /* no option? patch default path */
 342     DEFAULT_PATH: decode_file = mime_get_decode_file(decode_path, NULL);
 343
 344   if (decode_file == NULL)
 345     return DEFER;
 346
 347   /* read data linewise and dump it to the file,
 348      while looking for the current boundary */
 349   while(fgets(CS buffer, MIME_MAX_LINE_LENGTH, mime_stream) != NULL) {
 350     uschar *decoded_line = NULL;
 351     int decoded_line_length = 0;
 352
 353     if (mime_current_boundary != NULL) {
 354       /* boundary line must start with 2 dashes */
 355       if (Ustrncmp(buffer,"--",2) == 0) {
 356         if (Ustrncmp((buffer+2),mime_current_boundary,Ustrlen(mime_current_boundary)) == 0)
 357           break;
 358       };
 359     };
 360
 361     decoded_line = mime_parse_line(buffer, mime_content_transfer_encoding, &decoded_line_length);
 362     /* write line to decode file */
 363     if (fwrite(decoded_line, 1, decoded_line_length, decode_file) < decoded_line_length) {
 364       /* error/short write */
 365       clearerr(mime_stream);
 366       fseek(mime_stream,f_pos,SEEK_SET);
 367       return DEFER;
 368     };
 369     size_counter += decoded_line_length;
 370
 371     if (size_counter > 1023) {
 372       if ((mime_content_size + (size_counter / 1024)) < 65535)
 373         mime_content_size += (size_counter / 1024);
 374       else
 375         mime_content_size = 65535;
 376       size_counter = (size_counter % 1024);
 377     };
 378
 379     free(decoded_line);
 380   }
 381
 382   fclose(decode_file);
 383
 384   clearerr(mime_stream);
 385   fseek(mime_stream,f_pos,SEEK_SET);
 386
 387   /* round up remaining size bytes to one k */
 388   if (size_counter) {
 389     mime_content_size++;
 390   };
 391
 392   return OK;
 393 }
 394
 395 int mime_get_header(FILE *f, uschar *header) {
 396   int c = EOF;
 397   int done = 0;
 398   int header_value_mode = 0;
 399   int header_open_brackets = 0;
 400   int num_copied = 0;
 401
 402   while(!done) {
 403
 404     c = fgetc(f);
 405     if (c == EOF) break;
 406
 407     /* always skip CRs */
 408     if (c == '\r') continue;
 409
 410     if (c == '\n') {
 411       if (num_copied > 0) {
 412         /* look if next char is '\t' or ' ' */
 413         c = fgetc(f);
 414         if (c == EOF) break;
 415         if ( (c == '\t') || (c == ' ') ) continue;
 416         ungetc(c,f);
 417       };
 418       /* end of the header, terminate with ';' */
 419       c = ';';
 420       done = 1;
 421     };
 422
 423     /* skip control characters */
 424     if (c < 32) continue;
 425
 426     if (header_value_mode) {
 427       /* --------- value mode ----------- */
 428       /* skip leading whitespace */
 429       if ( ((c == '\t') || (c == ' ')) && (header_value_mode == 1) )
 430         continue;
 431
 432       /* we have hit a non-whitespace char, start copying value data */
 433       header_value_mode = 2;
 434
 435       /* skip quotes */
 436       if (c == '"') continue;
 437
 438       /* leave value mode on ';' */
 439       if (c == ';') {
 440         header_value_mode = 0;
 441       };
 442       /* -------------------------------- */
 443     }
 444     else {
 445       /* -------- non-value mode -------- */
 446       /* skip whitespace + tabs */
 447       if ( (c == ' ') || (c == '\t') )
 448         continue;
 449       if (c == '\\') {
 450         /* quote next char. can be used
 451         to escape brackets. */
 452         c = fgetc(f);
 453         if (c == EOF) break;
 454       }
 455       else if (c == '(') {
 456         header_open_brackets++;
 457         continue;
 458       }
 459       else if ((c == ')') && header_open_brackets) {
 460         header_open_brackets--;
 461         continue;
 462       }
 463       else if ( (c == '=') && !header_open_brackets ) {
 464         /* enter value mode */
 465         header_value_mode = 1;
 466       };
 467
 468       /* skip chars while we are in a comment */
 469       if (header_open_brackets > 0)
 470         continue;
 471       /* -------------------------------- */
 472     };
 473
 474     /* copy the char to the buffer */
 475     header[num_copied] = (uschar)c;
 476     /* raise counter */
 477     num_copied++;
 478
 479     /* break if header buffer is full */
 480     if (num_copied > MIME_MAX_HEADER_SIZE-1) {
 481       done = 1;
 482     };
 483   };
 484
 485   if (header[num_copied-1] != ';') {
 486     header[num_copied-1] = ';';
 487   };
 488
 489   /* 0-terminate */
 490   header[num_copied] = '\0';
 491
 492   /* return 0 for EOF or empty line */
 493   if ((c == EOF) || (num_copied == 1))
 494     return 0;
 495   else
 496     return 1;
 497 }
 498
 499
 500 int mime_acl_check(FILE *f, struct mime_boundary_context *context, uschar
 501                    **user_msgptr, uschar **log_msgptr) {
 502   int rc = OK;
 503   uschar *header = NULL;
 504   struct mime_boundary_context nested_context;
 505
 506   /* reserve a line buffer to work in */
 507   header = (uschar *)malloc(MIME_MAX_HEADER_SIZE+1);
 508   if (header == NULL) {
 509     log_write(0, LOG_PANIC,
 510                  "acl_smtp_mime: can't allocate %d bytes of memory.", MIME_MAX_HEADER_SIZE+1);
 511     return DEFER;
 512   };
 513
 514   /* Not actually used at the moment, but will be vital to fixing
 515    * some RFC 2046 nonconformance later... */
 516   nested_context.parent = context;
 517
 518   /* loop through parts */
 519   while(1) {
 520
 521     /* reset all per-part mime variables */
 522     mime_anomaly_level     = 0;
 523     mime_anomaly_text      = NULL;
 524     mime_boundary          = NULL;
 525     mime_charset           = NULL;
 526     mime_decoded_filename  = NULL;
 527     mime_filename          = NULL;
 528     mime_content_description = NULL;
 529     mime_content_disposition = NULL;
 530     mime_content_id        = NULL;
 531     mime_content_transfer_encoding = NULL;
 532     mime_content_type      = NULL;
 533     mime_is_multipart      = 0;
 534     mime_content_size      = 0;
 535
 536     /*
 537     If boundary is null, we assume that *f is positioned on the start of headers (for example,
 538     at the very beginning of a message.
 539     If a boundary is given, we must first advance to it to reach the start of the next header
 540     block.
 541     */
 542
 543     /* NOTE -- there's an error here -- RFC2046 specifically says to
 544      * check for outer boundaries.  This code doesn't do that, and
 545      * I haven't fixed this.
 546      *
 547      * (I have moved partway towards adding support, however, by adding
 548      * a "parent" field to my new boundary-context structure.)
 549      */
 550     if (context != NULL) {
 551       while(fgets(CS header, MIME_MAX_HEADER_SIZE, f) != NULL) {
 552         /* boundary line must start with 2 dashes */
 553         if (Ustrncmp(header,"--",2) == 0) {
 554           if (Ustrncmp((header+2),context->boundary,Ustrlen(context->boundary)) == 0) {
 555             /* found boundary */
 556             if (Ustrncmp((header+2+Ustrlen(context->boundary)),"--",2) == 0) {
 557               /* END boundary found */
 558               debug_printf("End boundary found %s\n", context->boundary);
 559               return rc;
 560             }
 561             else {
 562               debug_printf("Next part with boundary %s\n", context->boundary);
 563             };
 564             /* can't use break here */
 565             goto DECODE_HEADERS;
 566           }
 567         };
 568       }
 569       /* Hit EOF or read error. Ugh. */
 570       debug_printf("Hit EOF ...\n");
 571       return rc;
 572     };
 573
 574     DECODE_HEADERS:
 575     /* parse headers, set up expansion variables */
 576     while(mime_get_header(f,header)) {
 577       int i;
 578       /* loop through header list */
 579       for (i = 0; i < mime_header_list_size; i++) {
 580         uschar *header_value = NULL;
 581         int header_value_len = 0;
 582
 583         /* found an interesting header? */
 584         if (strncmpic(mime_header_list[i].name,header,mime_header_list[i].namelen) == 0) {
 585           uschar *p = header + mime_header_list[i].namelen;
 586           /* yes, grab the value (normalize to lower case)
 587              and copy to its corresponding expansion variable */
 588           while(*p != ';') {
 589             *p = tolower(*p);
 590             p++;
 591           };
 592           header_value_len = (p - (header + mime_header_list[i].namelen));
 593           header_value = (uschar *)malloc(header_value_len+1);
 594           memset(header_value,0,header_value_len+1);
 595           p = header + mime_header_list[i].namelen;
 596           Ustrncpy(header_value, p, header_value_len);
 597           debug_printf("Found %s MIME header, value is '%s'\n", mime_header_list[i].name, header_value);
 598           *((uschar **)(mime_header_list[i].value)) = header_value;
 599
 600           /* make p point to the next character after the closing ';' */
 601           p += (header_value_len+1);
 602
 603           /* grab all param=value tags on the remaining line, check if they are interesting */
 604           NEXT_PARAM_SEARCH: while (*p != 0) {
 605             int j;
 606             for (j = 0; j < mime_parameter_list_size; j++) {
 607               uschar *param_value = NULL;
 608               int param_value_len = 0;
 609
 610               /* found an interesting parameter? */
 611               if (strncmpic(mime_parameter_list[j].name,p,mime_parameter_list[j].namelen) == 0) {
 612                 uschar *q = p + mime_parameter_list[j].namelen;
 613                 /* yes, grab the value and copy to its corresponding expansion variable */
 614                 while(*q != ';') q++;
 615                 param_value_len = (q - (p + mime_parameter_list[j].namelen));
 616                 param_value = (uschar *)malloc(param_value_len+1);
 617                 memset(param_value,0,param_value_len+1);
 618                 q = p + mime_parameter_list[j].namelen;
 619                 Ustrncpy(param_value, q, param_value_len);
 620                 param_value = rfc2047_decode(param_value, TRUE, NULL, 32, &param_value_len, &q);
 621                 debug_printf("Found %s MIME parameter in %s header, value is '%s'\n", mime_parameter_list[j].name, mime_header_list[i].name, param_value);
 622                 *((uschar **)(mime_parameter_list[j].value)) = param_value;
 623                 p += (mime_parameter_list[j].namelen + param_value_len + 1);
 624                 goto NEXT_PARAM_SEARCH;
 625               };
 626             }
 627             /* There is something, but not one of our interesting parameters.
 628                Advance to the next semicolon */
 629             while(*p != ';') p++;
 630             p++;
 631           };
 632         };
 633       };
 634     };
 635
 636     /* set additional flag variables (easier access) */
 637     if ( (mime_content_type != NULL) &&
 638          (Ustrncmp(mime_content_type,"multipart",9) == 0) )
 639       mime_is_multipart = 1;
 640
 641     /* Make a copy of the boundary pointer.
 642        Required since mime_boundary is global
 643        and can be overwritten further down in recursion */
 644     nested_context.boundary = mime_boundary;
 645
 646     /* raise global counter */
 647     mime_part_count++;
 648
 649     /* copy current file handle to global variable */
 650     mime_stream = f;
 651     mime_current_boundary = context ? context->boundary : 0;
 652
 653     /* Note the context */
 654     mime_is_coverletter = !(context && context->context == MBC_ATTACHMENT);
 655
 656     /* call ACL handling function */
 657     rc = acl_check(ACL_WHERE_MIME, NULL, acl_smtp_mime, user_msgptr, log_msgptr);
 658
 659     mime_stream = NULL;
 660     mime_current_boundary = NULL;
 661
 662     if (rc != OK) break;
 663
 664     /* If we have a multipart entity and a boundary, go recursive */
 665     if ( (mime_content_type != NULL) &&
 666          (nested_context.boundary != NULL) &&
 667          (Ustrncmp(mime_content_type,"multipart",9) == 0) ) {
 668       debug_printf("Entering multipart recursion, boundary '%s'\n", nested_context.boundary);
 669
 670       if (context && context->context == MBC_ATTACHMENT)
 671         nested_context.context = MBC_ATTACHMENT;
 672       else if (!Ustrcmp(mime_content_type,"multipart/alternative")
 673             || !Ustrcmp(mime_content_type,"multipart/related"))
 674         nested_context.context = MBC_COVERLETTER_ALL;
 675       else
 676         nested_context.context = MBC_COVERLETTER_ONESHOT;
 677
 678       rc = mime_acl_check(f, &nested_context, user_msgptr, log_msgptr);
 679       if (rc != OK) break;
 680     }
 681     else if ( (mime_content_type != NULL) &&
 682             (Ustrncmp(mime_content_type,"message/rfc822",14) == 0) ) {
 683       uschar *rfc822name = NULL;
 684       uschar filename[2048];
 685       int file_nr = 0;
 686       int result = 0;
 687
 688       /* must find first free sequential filename */
 689       do {
 690         struct stat mystat;
 691         snprintf(CS filename,2048,"%s/scan/%s/__rfc822_%05u", spool_directory, message_id, file_nr);
 692         file_nr++;
 693         /* security break */
 694         if (file_nr >= 128)
 695           goto NO_RFC822;
 696         result = stat(CS filename,&mystat);
 697       }
 698       while(result != -1);
 699
 700       rfc822name = filename;
 701
 702       /* decode RFC822 attachment */
 703       mime_decoded_filename = NULL;
 704       mime_stream = f;
 705       mime_current_boundary = context ? context->boundary : NULL;
 706       mime_decode(&rfc822name);
 707       mime_stream = NULL;
 708       mime_current_boundary = NULL;
 709       if (mime_decoded_filename == NULL) {
 710         /* decoding failed */
 711         log_write(0, LOG_MAIN,
 712              "mime_regex acl condition warning - could not decode RFC822 MIME part to file.");
 713         return DEFER;
 714       };
 715       mime_decoded_filename = NULL;
 716     };
 717
 718     NO_RFC822:
 719     /* If the boundary of this instance is NULL, we are finished here */
 720     if (context == NULL) break;
 721
 722     if (context->context == MBC_COVERLETTER_ONESHOT)
 723       context->context = MBC_ATTACHMENT;
 724
 725   };
 726
 727   return rc;
 728 }
 729
 730 #endif