citadel/internet_addressing.c

   1 /*
   2  * $Id$
   3  *
   4  * This file contains functions which handle the mapping of Internet addresses
   5  * to users on the Citadel system.
   6  */
   7
   8 #include "sysdep.h"
   9 #include <stdlib.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <fcntl.h>
  13 #include <ctype.h>
  14 #include <signal.h>
  15 #include <pwd.h>
  16 #include <errno.h>
  17 #include <sys/types.h>
  18
  19 #if TIME_WITH_SYS_TIME
  20 # include <sys/time.h>
  21 # include <time.h>
  22 #else
  23 # if HAVE_SYS_TIME_H
  24 #  include <sys/time.h>
  25 # else
  26 #  include <time.h>
  27 # endif
  28 #endif
  29
  30 #include <sys/wait.h>
  31 #include <string.h>
  32 #include <limits.h>
  33 #include <libcitadel.h>
  34 #include "citadel.h"
  35 #include "server.h"
  36 #include "sysdep_decls.h"
  37 #include "citserver.h"
  38 #include "support.h"
  39 #include "config.h"
  40 #include "msgbase.h"
  41 #include "internet_addressing.h"
  42 #include "user_ops.h"
  43 #include "room_ops.h"
  44 #include "parsedate.h"
  45 #include "database.h"
  46
  47
  48 #ifndef HAVE_SNPRINTF
  49 #include "snprintf.h"
  50 #endif
  51
  52
  53 #ifdef HAVE_ICONV
  54 #include <iconv.h>
  55
  56 #if 0
  57 /* This is the non-define version in case of s.b. needing to debug */
  58 inline void FindNextEnd (char *bptr, char *end)
  59 {
  60         /* Find the next ?Q? */
  61         end = strchr(bptr + 2, '?');
  62         if (end == NULL) return NULL;
  63         if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) &&
  64             (*(end + 2) == '?')) {
  65                 /* skip on to the end of the cluster, the next ?= */
  66                 end = strstr(end + 3, "?=");
  67         }
  68         else
  69                 /* sort of half valid encoding, try to find an end. */
  70                 end = strstr(bptr, "?=");
  71 }
  72 #endif
  73
  74 #define FindNextEnd(bptr, end) { \
  75         end = strchr(bptr + 2, '?'); \
  76         if (end != NULL) { \
  77                 if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) && (*(end + 2) == '?')) { \
  78                         end = strstr(end + 3, "?="); \
  79                 } else end = strstr(bptr, "?="); \
  80         } \
  81 }
  82
  83 /*
  84  * Handle subjects with RFC2047 encoding such as:
  85  * =?koi8-r?B?78bP0s3Mxc7JxSDXz9rE1dvO2c3JINvB0sHNySDP?=
  86  */
  87 void utf8ify_rfc822_string(char *buf) {
  88         char *start, *end, *next, *nextend, *ptr;
  89         char newbuf[1024];
  90         char charset[128];
  91         char encoding[16];
  92         char istr[1024];
  93         iconv_t ic = (iconv_t)(-1) ;
  94         char *ibuf;                     /**< Buffer of characters to be converted */
  95         char *obuf;                     /**< Buffer for converted characters */
  96         size_t ibuflen;                 /**< Length of input buffer */
  97         size_t obuflen;                 /**< Length of output buffer */
  98         char *isav;                     /**< Saved pointer to input buffer */
  99         char *osav;                     /**< Saved pointer to output buffer */
 100         int passes = 0;
 101         int i, len, delta;
 102         int illegal_non_rfc2047_encoding = 0;
 103
 104         /* Sometimes, badly formed messages contain strings which were simply
 105          *  written out directly in some foreign character set instead of
 106          *  using RFC2047 encoding.  This is illegal but we will attempt to
 107          *  handle it anyway by converting from a user-specified default
 108          *  charset to UTF-8 if we see any nonprintable characters.
 109          */
 110         len = strlen(buf);
 111         for (i=0; i<len; ++i) {
 112                 if ((buf[i] < 32) || (buf[i] > 126)) {
 113                         illegal_non_rfc2047_encoding = 1;
 114                         i = len; ///< take a shortcut, it won't be more than one.
 115                 }
 116         }
 117         if (illegal_non_rfc2047_encoding) {
 118                 const char *default_header_charset = "iso-8859-1";
 119                 if ( (strcasecmp(default_header_charset, "UTF-8")) && (strcasecmp(default_header_charset, "us-ascii")) ) {
 120                         ctdl_iconv_open("UTF-8", default_header_charset, &ic);
 121                         if (ic != (iconv_t)(-1) ) {
 122                                 ibuf = malloc(1024);
 123                                 isav = ibuf;
 124                                 safestrncpy(ibuf, buf, 1024);
 125                                 ibuflen = strlen(ibuf);
 126                                 obuflen = 1024;
 127                                 obuf = (char *) malloc(obuflen);
 128                                 osav = obuf;
 129                                 iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
 130                                 osav[1024-obuflen] = 0;
 131                                 strcpy(buf, osav);
 132                                 free(osav);
 133                                 iconv_close(ic);
 134                                 free(isav);
 135                         }
 136                 }
 137         }
 138
 139         /* pre evaluate the first pair */
 140         nextend = end = NULL;
 141         len = strlen(buf);
 142         start = strstr(buf, "=?");
 143         if (start != NULL)
 144                 FindNextEnd (start, end);
 145
 146         while ((start != NULL) && (end != NULL))
 147         {
 148                 next = strstr(end, "=?");
 149                 if (next != NULL)
 150                         FindNextEnd(next, nextend);
 151                 if (nextend == NULL)
 152                         next = NULL;
 153
 154                 /* did we find two partitions */
 155                 if ((next != NULL) &&
 156                     ((next - end) > 2))
 157                 {
 158                         ptr = end + 2;
 159                         while ((ptr < next) &&
 160                                (isspace(*ptr) ||
 161                                 (*ptr == '\r') ||
 162                                 (*ptr == '\n') ||
 163                                 (*ptr == '\t')))
 164                                 ptr ++;
 165                         /* did we find a gab just filled with blanks? */
 166                         if (ptr == next)
 167                         {
 168                                 memmove (end + 2,
 169                                          next,
 170                                          len - (next - start));
 171
 172                                 /* now terminate the gab at the end */
 173                                 delta = (next - end) - 2;
 174                                 len -= delta;
 175                                 buf[len] = '\0';
 176
 177                                 /* move next to its new location. */
 178                                 next -= delta;
 179                                 nextend -= delta;
 180                         }
 181                 }
 182                 /* our next-pair is our new first pair now. */
 183                 start = next;
 184                 end = nextend;
 185         }
 186
 187         /* Now we handle foreign character sets properly encoded
 188          * in RFC2047 format.
 189          */
 190         start = strstr(buf, "=?");
 191         FindNextEnd((start != NULL)? start : buf, end);
 192         while (start != NULL && end != NULL && end > start)
 193         {
 194                 extract_token(charset, start, 1, '?', sizeof charset);
 195                 extract_token(encoding, start, 2, '?', sizeof encoding);
 196                 extract_token(istr, start, 3, '?', sizeof istr);
 197
 198                 ibuf = malloc(1024);
 199                 isav = ibuf;
 200                 if (!strcasecmp(encoding, "B")) {       /**< base64 */
 201                         ibuflen = CtdlDecodeBase64(ibuf, istr, strlen(istr));
 202                 }
 203                 else if (!strcasecmp(encoding, "Q")) {  /**< quoted-printable */
 204                         size_t len;
 205                         long pos;
 206
 207                         len = strlen(istr);
 208                         pos = 0;
 209                         while (pos < len)
 210                         {
 211                                 if (istr[pos] == '_') istr[pos] = ' ';
 212                                 pos++;
 213                         }
 214
 215                         ibuflen = CtdlDecodeQuotedPrintable(ibuf, istr, len);
 216                 }
 217                 else {
 218                         strcpy(ibuf, istr);             /**< unknown encoding */
 219                         ibuflen = strlen(istr);
 220                 }
 221
 222                 ctdl_iconv_open("UTF-8", charset, &ic);
 223                 if (ic != (iconv_t)(-1) ) {
 224                         obuflen = 1024;
 225                         obuf = (char *) malloc(obuflen);
 226                         osav = obuf;
 227                         iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
 228                         osav[1024-obuflen] = 0;
 229
 230                         end = start;
 231                         end++;
 232                         strcpy(start, "");
 233                         remove_token(end, 0, '?');
 234                         remove_token(end, 0, '?');
 235                         remove_token(end, 0, '?');
 236                         remove_token(end, 0, '?');
 237                         strcpy(end, &end[1]);
 238
 239                         snprintf(newbuf, sizeof newbuf, "%s%s%s", buf, osav, end);
 240                         strcpy(buf, newbuf);
 241                         free(osav);
 242                         iconv_close(ic);
 243                 }
 244                 else {
 245                         end = start;
 246                         end++;
 247                         strcpy(start, "");
 248                         remove_token(end, 0, '?');
 249                         remove_token(end, 0, '?');
 250                         remove_token(end, 0, '?');
 251                         remove_token(end, 0, '?');
 252                         strcpy(end, &end[1]);
 253
 254                         snprintf(newbuf, sizeof newbuf, "%s(unreadable)%s", buf, end);
 255                         strcpy(buf, newbuf);
 256                 }
 257
 258                 free(isav);
 259
 260                 /*
 261                  * Since spammers will go to all sorts of absurd lengths to get their
 262                  * messages through, there are LOTS of corrupt headers out there.
 263                  * So, prevent a really badly formed RFC2047 header from throwing
 264                  * this function into an infinite loop.
 265                  */
 266                 ++passes;
 267                 if (passes > 20) return;
 268
 269                 start = strstr(buf, "=?");
 270                 FindNextEnd((start != NULL)? start : buf, end);
 271         }
 272
 273 }
 274 #else
 275 inline void utf8ify_rfc822_string(char *a){};
 276
 277 #endif
 278
 279
 280
 281 struct trynamebuf {
 282         char buffer1[SIZ];
 283         char buffer2[SIZ];
 284 };
 285
 286 char *inetcfg = NULL;
 287 struct spamstrings_t *spamstrings = NULL;
 288
 289
 290 /*
 291  * Return nonzero if the supplied name is an alias for this host.
 292  */
 293 int CtdlHostAlias(char *fqdn) {
 294         int config_lines;
 295         int i;
 296         char buf[256];
 297         char host[256], type[256];
 298         int found = 0;
 299
 300         if (fqdn == NULL) return(hostalias_nomatch);
 301         if (IsEmptyStr(fqdn)) return(hostalias_nomatch);
 302         if (!strcasecmp(fqdn, "localhost")) return(hostalias_localhost);
 303         if (!strcasecmp(fqdn, config.c_fqdn)) return(hostalias_localhost);
 304         if (!strcasecmp(fqdn, config.c_nodename)) return(hostalias_localhost);
 305         if (inetcfg == NULL) return(hostalias_nomatch);
 306
 307         config_lines = num_tokens(inetcfg, '\n');
 308         for (i=0; i<config_lines; ++i) {
 309                 extract_token(buf, inetcfg, i, '\n', sizeof buf);
 310                 extract_token(host, buf, 0, '|', sizeof host);
 311                 extract_token(type, buf, 1, '|', sizeof type);
 312
 313                 found = 0;
 314
 315                 /* Process these in a specific order, in case there are multiple matches.
 316                  * We want directory to override masq, for example.
 317                  */
 318
 319                 if ( (!strcasecmp(type, "masqdomain")) && (!strcasecmp(fqdn, host))) {
 320                         found = hostalias_masq;
 321                 }
 322                 if ( (!strcasecmp(type, "localhost")) && (!strcasecmp(fqdn, host))) {
 323                         found = hostalias_localhost;
 324                 }
 325                 if ( (!strcasecmp(type, "directory")) && (!strcasecmp(fqdn, host))) {
 326                         found = hostalias_directory;
 327                 }
 328
 329                 if (found) return(found);
 330         }
 331
 332         return(hostalias_nomatch);
 333 }
 334
 335
 336
 337
 338
 339
 340
 341 /*
 342  * Return 0 if a given string fuzzy-matches a Citadel user account
 343  *
 344  * FIXME ... this needs to be updated to handle aliases.
 345  */
 346 int fuzzy_match(struct ctdluser *us, char *matchstring) {
 347         int a;
 348         long len;
 349
 350         if ( (!strncasecmp(matchstring, "cit", 3))
 351            && (atol(&matchstring[3]) == us->usernum)) {
 352                 return 0;
 353         }
 354
 355         len = strlen(matchstring);
 356         for (a=0; !IsEmptyStr(&us->fullname[a]); ++a) {
 357                 if (!strncasecmp(&us->fullname[a],
 358                    matchstring, len)) {
 359                         return 0;
 360                 }
 361         }
 362         return -1;
 363 }
 364
 365
 366 /*
 367  * Unfold a multi-line field into a single line, removing multi-whitespaces
 368  */
 369 void unfold_rfc822_field(char *field) {
 370         int i;
 371         int quote = 0;
 372
 373         striplt(field);         /* remove leading/trailing whitespace */
 374
 375         /* convert non-space whitespace to spaces, and remove double blanks */
 376         for (i=0; i<strlen(field); ++i) {
 377                 if (field[i]=='\"') quote = 1 - quote;
 378                 if (!quote) {
 379                         if (isspace(field[i])) field[i] = ' ';
 380                         while (isspace(field[i]) && isspace(field[i+1])) {
 381                                 strcpy(&field[i+1], &field[i+2]);
 382                         }
 383                 }
 384         }
 385 }
 386
 387
 388
 389 /*
 390  * Split an RFC822-style address into userid, host, and full name
 391  *
 392  */
 393 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name)
 394 {
 395         int a;
 396
 397         strcpy(user, "");
 398         strcpy(node, config.c_fqdn);
 399         strcpy(name, "");
 400
 401         if (rfc822 == NULL) return;
 402
 403         /* extract full name - first, it's From minus <userid> */
 404         strcpy(name, rfc822);
 405         stripout(name, '<', '>');
 406
 407         /* strip anything to the left of a bang */
 408         while ((!IsEmptyStr(name)) && (haschar(name, '!') > 0))
 409                 strcpy(name, &name[1]);
 410
 411         /* and anything to the right of a @ or % */
 412         for (a = 0; a < strlen(name); ++a) {
 413                 if (name[a] == '@')
 414                         name[a] = 0;
 415                 if (name[a] == '%')
 416                         name[a] = 0;
 417         }
 418
 419         /* but if there are parentheses, that changes the rules... */
 420         if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
 421                 strcpy(name, rfc822);
 422                 stripallbut(name, '(', ')');
 423         }
 424
 425         /* but if there are a set of quotes, that supersedes everything */
 426         if (haschar(rfc822, 34) == 2) {
 427                 strcpy(name, rfc822);
 428                 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
 429                         strcpy(&name[0], &name[1]);
 430                 }
 431                 strcpy(&name[0], &name[1]);
 432                 for (a = 0; a < strlen(name); ++a)
 433                         if (name[a] == 34)
 434                                 name[a] = 0;
 435         }
 436         /* extract user id */
 437         strcpy(user, rfc822);
 438
 439         /* first get rid of anything in parens */
 440         stripout(user, '(', ')');
 441
 442         /* if there's a set of angle brackets, strip it down to that */
 443         if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
 444                 stripallbut(user, '<', '>');
 445         }
 446
 447         /* strip anything to the left of a bang */
 448         while ((!IsEmptyStr(user)) && (haschar(user, '!') > 0))
 449                 strcpy(user, &user[1]);
 450
 451         /* and anything to the right of a @ or % */
 452         for (a = 0; a < strlen(user); ++a) {
 453                 if (user[a] == '@')
 454                         user[a] = 0;
 455                 if (user[a] == '%')
 456                         user[a] = 0;
 457         }
 458
 459
 460         /* extract node name */
 461         strcpy(node, rfc822);
 462
 463         /* first get rid of anything in parens */
 464         stripout(node, '(', ')');
 465
 466         /* if there's a set of angle brackets, strip it down to that */
 467         if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
 468                 stripallbut(node, '<', '>');
 469         }
 470
 471         /* If no node specified, tack ours on instead */
 472         if (
 473                 (haschar(node, '@')==0)
 474                 && (haschar(node, '%')==0)
 475                 && (haschar(node, '!')==0)
 476         ) {
 477                 strcpy(node, config.c_nodename);
 478         }
 479
 480         else {
 481
 482                 /* strip anything to the left of a @ */
 483                 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0))
 484                         strcpy(node, &node[1]);
 485
 486                 /* strip anything to the left of a % */
 487                 while ((!IsEmptyStr(node)) && (haschar(node, '%') > 0))
 488                         strcpy(node, &node[1]);
 489
 490                 /* reduce multiple system bang paths to node!user */
 491                 while ((!IsEmptyStr(node)) && (haschar(node, '!') > 1))
 492                         strcpy(node, &node[1]);
 493
 494                 /* now get rid of the user portion of a node!user string */
 495                 for (a = 0; a < strlen(node); ++a)
 496                         if (node[a] == '!')
 497                                 node[a] = 0;
 498         }
 499
 500         /* strip leading and trailing spaces in all strings */
 501         striplt(user);
 502         striplt(node);
 503         striplt(name);
 504
 505         /* If we processed a string that had the address in angle brackets
 506          * but no name outside the brackets, we now have an empty name.  In
 507          * this case, use the user portion of the address as the name.
 508          */
 509         if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
 510                 strcpy(name, user);
 511         }
 512 }
 513
 514
 515
 516 /*
 517  * convert_field() is a helper function for convert_internet_message().
 518  * Given start/end positions for an rfc822 field, it converts it to a Citadel
 519  * field if it wants to, and unfolds it if necessary.
 520  *
 521  * Returns 1 if the field was converted and inserted into the Citadel message
 522  * structure, implying that the source field should be removed from the
 523  * message text.
 524  */
 525 int convert_field(struct CtdlMessage *msg, int beg, int end) {
 526         char *rfc822;
 527         char *key, *value;
 528         int i;
 529         int colonpos = (-1);
 530         int processed = 0;
 531         char buf[SIZ];
 532         char user[1024];
 533         char node[1024];
 534         char name[1024];
 535         char addr[1024];
 536         time_t parsed_date;
 537
 538         rfc822 = msg->cm_fields['M'];   /* M field contains rfc822 text */
 539         for (i = end; i >= beg; --i) {
 540                 if (rfc822[i] == ':') colonpos = i;
 541         }
 542
 543         if (colonpos < 0) return(0);    /* no colon? not a valid header line */
 544
 545         key = malloc((end - beg) + 2);
 546         safestrncpy(key, &rfc822[beg], (end-beg)+1);
 547         key[colonpos - beg] = 0;
 548         value = &key[(colonpos - beg) + 1];
 549         unfold_rfc822_field(value);
 550
 551         /*
 552          * Here's the big rfc822-to-citadel loop.
 553          */
 554
 555         /* Date/time is converted into a unix timestamp.  If the conversion
 556          * fails, we replace it with the time the message arrived locally.
 557          */
 558         if (!strcasecmp(key, "Date")) {
 559                 parsed_date = parsedate(value);
 560                 if (parsed_date < 0L) parsed_date = time(NULL);
 561                 snprintf(buf, sizeof buf, "%ld", (long)parsed_date );
 562                 if (msg->cm_fields['T'] == NULL)
 563                         msg->cm_fields['T'] = strdup(buf);
 564                 processed = 1;
 565         }
 566
 567         else if (!strcasecmp(key, "From")) {
 568                 process_rfc822_addr(value, user, node, name);
 569                 CtdlLogPrintf(CTDL_DEBUG, "Converted to <%s@%s> (%s)\n", user, node, name);
 570                 snprintf(addr, sizeof addr, "%s@%s", user, node);
 571                 if (msg->cm_fields['A'] == NULL)
 572                         msg->cm_fields['A'] = strdup(name);
 573                 processed = 1;
 574                 if (msg->cm_fields['F'] == NULL)
 575                         msg->cm_fields['F'] = strdup(addr);
 576                 processed = 1;
 577         }
 578
 579         else if (!strcasecmp(key, "Subject")) {
 580                 if (msg->cm_fields['U'] == NULL)
 581                         msg->cm_fields['U'] = strdup(value);
 582                 processed = 1;
 583         }
 584
 585         else if (!strcasecmp(key, "List-ID")) {
 586                 if (msg->cm_fields['L'] == NULL)
 587                         msg->cm_fields['L'] = strdup(value);
 588                 processed = 1;
 589         }
 590
 591         else if (!strcasecmp(key, "To")) {
 592                 if (msg->cm_fields['R'] == NULL)
 593                         msg->cm_fields['R'] = strdup(value);
 594                 processed = 1;
 595         }
 596
 597         else if (!strcasecmp(key, "CC")) {
 598                 if (msg->cm_fields['Y'] == NULL)
 599                         msg->cm_fields['Y'] = strdup(value);
 600                 processed = 1;
 601         }
 602
 603         else if (!strcasecmp(key, "Message-ID")) {
 604                 if (msg->cm_fields['I'] != NULL) {
 605                         CtdlLogPrintf(CTDL_WARNING, "duplicate message id\n");
 606                 }
 607
 608                 if (msg->cm_fields['I'] == NULL) {
 609                         msg->cm_fields['I'] = strdup(value);
 610
 611                         /* Strip angle brackets */
 612                         while (haschar(msg->cm_fields['I'], '<') > 0) {
 613                                 strcpy(&msg->cm_fields['I'][0],
 614                                         &msg->cm_fields['I'][1]);
 615                         }
 616                         for (i = 0; i<strlen(msg->cm_fields['I']); ++i)
 617                                 if (msg->cm_fields['I'][i] == '>')
 618                                         msg->cm_fields['I'][i] = 0;
 619                 }
 620
 621                 processed = 1;
 622         }
 623
 624         else if (!strcasecmp(key, "Return-Path")) {
 625                 if (msg->cm_fields['P'] == NULL)
 626                         msg->cm_fields['P'] = strdup(value);
 627                 processed = 1;
 628         }
 629
 630         else if (!strcasecmp(key, "Envelope-To")) {
 631                 if (msg->cm_fields['V'] == NULL)
 632                         msg->cm_fields['V'] = strdup(value);
 633                 processed = 1;
 634         }
 635
 636         else if (!strcasecmp(key, "References")) {
 637                 if (msg->cm_fields['W'] != NULL) {
 638                         free(msg->cm_fields['W']);
 639                 }
 640                 msg->cm_fields['W'] = strdup(value);
 641                 processed = 1;
 642         }
 643
 644         else if (!strcasecmp(key, "In-reply-to")) {
 645                 if (msg->cm_fields['W'] == NULL) {              /* References: supersedes In-reply-to: */
 646                         msg->cm_fields['W'] = strdup(value);
 647                 }
 648                 processed = 1;
 649         }
 650
 651
 652
 653         /* Clean up and move on. */
 654         free(key);      /* Don't free 'value', it's actually the same buffer */
 655         return(processed);
 656 }
 657
 658
 659 /*
 660  * Convert RFC822 references format (References) to Citadel references format (Weferences)
 661  */
 662 void convert_references_to_wefewences(char *str) {
 663         int bracket_nesting = 0;
 664         char *ptr = str;
 665         char *moveptr = NULL;
 666         char ch;
 667
 668         while(*ptr) {
 669                 ch = *ptr;
 670                 if (ch == '>') {
 671                         --bracket_nesting;
 672                         if (bracket_nesting < 0) bracket_nesting = 0;
 673                 }
 674                 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
 675                         *ptr = '|';
 676                         ++ptr;
 677                 }
 678                 else if (bracket_nesting > 0) {
 679                         ++ptr;
 680                 }
 681                 else {
 682                         moveptr = ptr;
 683                         while (*moveptr) {
 684                                 *moveptr = *(moveptr+1);
 685                                 ++moveptr;
 686                         }
 687                 }
 688                 if (ch == '<') ++bracket_nesting;
 689         }
 690
 691 }
 692
 693
 694 /*
 695  * Convert an RFC822 message (headers + body) to a CtdlMessage structure.
 696  * NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
 697  * will be deallocated when CtdlFreeMessage() is called.  Therefore, the
 698  * supplied buffer should be DEREFERENCED.  It should not be freed or used
 699  * again.
 700  */
 701 struct CtdlMessage *convert_internet_message(char *rfc822) {
 702
 703         struct CtdlMessage *msg;
 704         int pos, beg, end, msglen;
 705         int done;
 706         char buf[SIZ];
 707         int converted;
 708
 709         msg = malloc(sizeof(struct CtdlMessage));
 710         if (msg == NULL) return msg;
 711
 712         memset(msg, 0, sizeof(struct CtdlMessage));
 713         msg->cm_magic = CTDLMESSAGE_MAGIC;      /* self check */
 714         msg->cm_anon_type = 0;                  /* never anonymous */
 715         msg->cm_format_type = FMT_RFC822;       /* internet message */
 716         msg->cm_fields['M'] = rfc822;
 717
 718         pos = 0;
 719         done = 0;
 720
 721         while (!done) {
 722
 723                 /* Locate beginning and end of field, keeping in mind that
 724                  * some fields might be multiline
 725                  */
 726                 beg = pos;
 727                 end = (-1);
 728
 729                 msglen = strlen(rfc822);
 730                 while ( (end < 0) && (done == 0) ) {
 731
 732                         if ((rfc822[pos]=='\n')
 733                            && (!isspace(rfc822[pos+1]))) {
 734                                 end = pos;
 735                         }
 736
 737                         /* done with headers? */
 738                         if (   (rfc822[pos]=='\n')
 739                            && ( (rfc822[pos+1]=='\n')
 740                               ||(rfc822[pos+1]=='\r')) ) {
 741                                 end = pos;
 742                                 done = 1;
 743                         }
 744
 745                         if (pos >= (msglen-1) ) {
 746                                 end = pos;
 747                                 done = 1;
 748                         }
 749
 750                         ++pos;
 751
 752                 }
 753
 754                 /* At this point we have a field.  Are we interested in it? */
 755                 converted = convert_field(msg, beg, end);
 756
 757                 /* Strip the field out of the RFC822 header if we used it */
 758                 if (converted) {
 759                         strcpy(&rfc822[beg], &rfc822[pos]);
 760                         pos = beg;
 761                 }
 762
 763                 /* If we've hit the end of the message, bail out */
 764                 if (pos > strlen(rfc822)) done = 1;
 765         }
 766
 767         /* Follow-up sanity checks... */
 768
 769         /* If there's no timestamp on this message, set it to now. */
 770         if (msg->cm_fields['T'] == NULL) {
 771                 snprintf(buf, sizeof buf, "%ld", (long)time(NULL));
 772                 msg->cm_fields['T'] = strdup(buf);
 773         }
 774
 775         /* If a W (references, or rather, Wefewences) field is present, we
 776          * have to convert it from RFC822 format to Citadel format.
 777          */
 778         if (msg->cm_fields['W'] != NULL) {
 779                 convert_references_to_wefewences(msg->cm_fields['W']);
 780         }
 781
 782         return msg;
 783 }
 784
 785
 786
 787 /*
 788  * Look for a particular header field in an RFC822 message text.  If the
 789  * requested field is found, it is unfolded (if necessary) and returned to
 790  * the caller.  The field name is stripped out, leaving only its contents.
 791  * The caller is responsible for freeing the returned buffer.  If the requested
 792  * field is not present, or anything else goes wrong, it returns NULL.
 793  */
 794 char *rfc822_fetch_field(char *rfc822, char *fieldname) {
 795         char *fieldbuf = NULL;
 796         char *end_of_headers;
 797         char *field_start;
 798         char *ptr;
 799         char *cont;
 800         char fieldhdr[SIZ];
 801
 802         /* Should never happen, but sometimes we get stupid */
 803         if (rfc822 == NULL) return(NULL);
 804         if (fieldname == NULL) return(NULL);
 805
 806         snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
 807
 808         /* Locate the end of the headers, so we don't run past that point */
 809         end_of_headers = bmstrcasestr(rfc822, "\n\r\n");
 810         if (end_of_headers == NULL) {
 811                 end_of_headers = bmstrcasestr(rfc822, "\n\n");
 812         }
 813         if (end_of_headers == NULL) return (NULL);
 814
 815         field_start = bmstrcasestr(rfc822, fieldhdr);
 816         if (field_start == NULL) return(NULL);
 817         if (field_start > end_of_headers) return(NULL);
 818
 819         fieldbuf = malloc(SIZ);
 820         strcpy(fieldbuf, "");
 821
 822         ptr = field_start;
 823         ptr = memreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
 824         while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
 825                 strcat(fieldbuf, " ");
 826                 cont = &fieldbuf[strlen(fieldbuf)];
 827                 ptr = memreadline(ptr, cont, SIZ-strlen(fieldbuf) );
 828                 striplt(cont);
 829         }
 830
 831         strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
 832         striplt(fieldbuf);
 833
 834         return(fieldbuf);
 835 }
 836
 837
 838
 839 /*****************************************************************************
 840  *                      DIRECTORY MANAGEMENT FUNCTIONS                       *
 841  *****************************************************************************/
 842
 843 /*
 844  * Generate the index key for an Internet e-mail address to be looked up
 845  * in the database.
 846  */
 847 void directory_key(char *key, char *addr) {
 848         int i;
 849         int keylen = 0;
 850
 851         for (i=0; !IsEmptyStr(&addr[i]); ++i) {
 852                 if (!isspace(addr[i])) {
 853                         key[keylen++] = tolower(addr[i]);
 854                 }
 855         }
 856         key[keylen++] = 0;
 857
 858         CtdlLogPrintf(CTDL_DEBUG, "Directory key is <%s>\n", key);
 859 }
 860
 861
 862
 863 /* Return nonzero if the supplied address is in a domain we keep in
 864  * the directory
 865  */
 866 int IsDirectory(char *addr, int allow_masq_domains) {
 867         char domain[256];
 868         int h;
 869
 870         extract_token(domain, addr, 1, '@', sizeof domain);
 871         striplt(domain);
 872
 873         h = CtdlHostAlias(domain);
 874
 875         if ( (h == hostalias_masq) && allow_masq_domains)
 876                 return(1);
 877
 878         if ( (h == hostalias_localhost) || (h == hostalias_directory) ) {
 879                 return(1);
 880         }
 881         else {
 882                 return(0);
 883         }
 884 }
 885
 886
 887 /*
 888  * Initialize the directory database (erasing anything already there)
 889  */
 890 void CtdlDirectoryInit(void) {
 891         cdb_trunc(CDB_DIRECTORY);
 892 }
 893
 894
 895 /*
 896  * Add an Internet e-mail address to the directory for a user
 897  */
 898 void CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
 899         char key[SIZ];
 900
 901         if (IsDirectory(internet_addr, 0) == 0) return;
 902         CtdlLogPrintf(CTDL_DEBUG, "Dir: %s --> %s\n", internet_addr, citadel_addr);
 903         directory_key(key, internet_addr);
 904         cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
 905 }
 906
 907
 908 /*
 909  * Delete an Internet e-mail address from the directory.
 910  *
 911  * (NOTE: we don't actually use or need the citadel_addr variable; it's merely
 912  * here because the callback API expects to be able to send it.)
 913  */
 914 void CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
 915         char key[SIZ];
 916
 917         directory_key(key, internet_addr);
 918         cdb_delete(CDB_DIRECTORY, key, strlen(key) );
 919 }
 920
 921
 922 /*
 923  * Look up an Internet e-mail address in the directory.
 924  * On success: returns 0, and Citadel address stored in 'target'
 925  * On failure: returns nonzero
 926  */
 927 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
 928         struct cdbdata *cdbrec;
 929         char key[SIZ];
 930
 931         /* Dump it in there unchanged, just for kicks */
 932         safestrncpy(target, internet_addr, targbuflen);
 933
 934         /* Only do lookups for addresses with hostnames in them */
 935         if (num_tokens(internet_addr, '@') != 2) return(-1);
 936
 937         /* Only do lookups for domains in the directory */
 938         if (IsDirectory(internet_addr, 0) == 0) return(-1);
 939
 940         directory_key(key, internet_addr);
 941         cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key) );
 942         if (cdbrec != NULL) {
 943                 safestrncpy(target, cdbrec->ptr, targbuflen);
 944                 cdb_free(cdbrec);
 945                 return(0);
 946         }
 947
 948         return(-1);
 949 }
 950
 951
 952 /*
 953  * Harvest any email addresses that someone might want to have in their
 954  * "collected addresses" book.
 955  */
 956 char *harvest_collected_addresses(struct CtdlMessage *msg) {
 957         char *coll = NULL;
 958         char addr[256];
 959         char user[256], node[256], name[256];
 960         int is_harvestable;
 961         int i, j, h;
 962         int field = 0;
 963
 964         if (msg == NULL) return(NULL);
 965
 966         is_harvestable = 1;
 967         strcpy(addr, "");
 968         if (msg->cm_fields['A'] != NULL) {
 969                 strcat(addr, msg->cm_fields['A']);
 970         }
 971         if (msg->cm_fields['F'] != NULL) {
 972                 strcat(addr, " <");
 973                 strcat(addr, msg->cm_fields['F']);
 974                 strcat(addr, ">");
 975                 if (IsDirectory(msg->cm_fields['F'], 0)) {
 976                         is_harvestable = 0;
 977                 }
 978         }
 979
 980         if (is_harvestable) {
 981                 coll = strdup(addr);
 982         }
 983         else {
 984                 coll = strdup("");
 985         }
 986
 987         if (coll == NULL) return(NULL);
 988
 989         /* Scan both the R (To) and Y (CC) fields */
 990         for (i = 0; i < 2; ++i) {
 991                 if (i == 0) field = 'R' ;
 992                 if (i == 1) field = 'Y' ;
 993
 994                 if (msg->cm_fields[field] != NULL) {
 995                         for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
 996                                 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
 997                                 if (strstr(addr, "=?") != NULL)
 998                                         utf8ify_rfc822_string(addr);
 999                                 process_rfc822_addr(addr, user, node, name);
1000                                 h = CtdlHostAlias(node);
1001                                 if ( (h != hostalias_localhost) && (h != hostalias_directory) ) {
1002                                         coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1003                                         if (coll == NULL) return(NULL);
1004                                         if (!IsEmptyStr(coll)) {
1005                                                 strcat(coll, ",");
1006                                         }
1007                                         striplt(addr);
1008                                         strcat(coll, addr);
1009                                 }
1010                         }
1011                 }
1012         }
1013
1014         if (IsEmptyStr(coll)) {
1015                 free(coll);
1016                 return(NULL);
1017         }
1018         return(coll);
1019 }