citadel/internet_addressing.c

   1 // This file contains functions which handle the mapping of Internet addresses
   2 // to users on the Citadel system.
   3 //
   4 // Copyright (c) 1987-2022 by the citadel.org team
   5 //
   6 // This program is open source software; you can redistribute it and/or modify
   7 // it under the terms of the GNU General Public License version 3.
   8 //
   9 // This program is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 #include "sysdep.h"
  15 #include <stdlib.h>
  16 #include <unistd.h>
  17 #include <stdio.h>
  18 #include <fcntl.h>
  19 #include <ctype.h>
  20 #include <signal.h>
  21 #include <pwd.h>
  22 #include <errno.h>
  23 #include <sys/types.h>
  24 #include <time.h>
  25 #include <sys/wait.h>
  26 #include <string.h>
  27 #include <limits.h>
  28 #include <libcitadel.h>
  29 #include "citadel.h"
  30 #include "server.h"
  31 #include "sysdep_decls.h"
  32 #include "citserver.h"
  33 #include "support.h"
  34 #include "config.h"
  35 #include "msgbase.h"
  36 #include "internet_addressing.h"
  37 #include "user_ops.h"
  38 #include "room_ops.h"
  39 #include "parsedate.h"
  40 #include "database.h"
  41 #include "ctdl_module.h"
  42 #ifdef HAVE_ICONV
  43 #include <iconv.h>
  44
  45 // This is the non-define version in case it is needed for debugging
  46 #if 0
  47 inline void FindNextEnd (char *bptr, char *end)
  48 {
  49         /* Find the next ?Q? */
  50         end = strchr(bptr + 2, '?');
  51         if (end == NULL) return NULL;
  52         if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) &&
  53             (*(end + 2) == '?')) {
  54                 /* skip on to the end of the cluster, the next ?= */
  55                 end = strstr(end + 3, "?=");
  56         }
  57         else
  58                 /* sort of half valid encoding, try to find an end. */
  59                 end = strstr(bptr, "?=");
  60 }
  61 #endif
  62
  63 #define FindNextEnd(bptr, end) { \
  64         end = strchr(bptr + 2, '?'); \
  65         if (end != NULL) { \
  66                 if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) && (*(end + 2) == '?')) { \
  67                         end = strstr(end + 3, "?="); \
  68                 } else end = strstr(bptr, "?="); \
  69         } \
  70 }
  71
  72 // Handle subjects with RFC2047 encoding such as:
  73 // =?koi8-r?B?78bP0s3Mxc7JxSDXz9rE1dvO2c3JINvB0sHNySDP?=
  74 void utf8ify_rfc822_string(char *buf) {
  75         char *start, *end, *next, *nextend, *ptr;
  76         char newbuf[1024];
  77         char charset[128];
  78         char encoding[16];
  79         char istr[1024];
  80         iconv_t ic = (iconv_t)(-1) ;
  81         char *ibuf;                     // Buffer of characters to be converted
  82         char *obuf;                     // Buffer for converted characters
  83         size_t ibuflen;                 // Length of input buffer
  84         size_t obuflen;                 // Length of output buffer
  85         char *isav;                     // Saved pointer to input buffer
  86         char *osav;                     // Saved pointer to output buffer
  87         int passes = 0;
  88         int i, len, delta;
  89         int illegal_non_rfc2047_encoding = 0;
  90
  91         // Sometimes, badly formed messages contain strings which were simply
  92         // written out directly in some foreign character set instead of
  93         // using RFC2047 encoding.  This is illegal but we will attempt to
  94         // handle it anyway by converting from a user-specified default
  95         // charset to UTF-8 if we see any nonprintable characters.
  96         len = strlen(buf);
  97         for (i=0; i<len; ++i) {
  98                 if ((buf[i] < 32) || (buf[i] > 126)) {
  99                         illegal_non_rfc2047_encoding = 1;
 100                         i = len;        // take a shortcut, it won't be more than one.
 101                 }
 102         }
 103         if (illegal_non_rfc2047_encoding) {
 104                 const char *default_header_charset = "iso-8859-1";
 105                 if ( (strcasecmp(default_header_charset, "UTF-8")) && (strcasecmp(default_header_charset, "us-ascii")) ) {
 106                         ctdl_iconv_open("UTF-8", default_header_charset, &ic);
 107                         if (ic != (iconv_t)(-1) ) {
 108                                 ibuf = malloc(1024);
 109                                 isav = ibuf;
 110                                 safestrncpy(ibuf, buf, 1024);
 111                                 ibuflen = strlen(ibuf);
 112                                 obuflen = 1024;
 113                                 obuf = (char *) malloc(obuflen);
 114                                 osav = obuf;
 115                                 iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
 116                                 osav[1024-obuflen] = 0;
 117                                 strcpy(buf, osav);
 118                                 free(osav);
 119                                 iconv_close(ic);
 120                                 free(isav);
 121                         }
 122                 }
 123         }
 124
 125         // pre evaluate the first pair
 126         nextend = end = NULL;
 127         len = strlen(buf);
 128         start = strstr(buf, "=?");
 129         if (start != NULL)
 130                 FindNextEnd (start, end);
 131
 132         while ((start != NULL) && (end != NULL)) {
 133                 next = strstr(end, "=?");
 134                 if (next != NULL)
 135                         FindNextEnd(next, nextend);
 136                 if (nextend == NULL)
 137                         next = NULL;
 138
 139                 // did we find two partitions
 140                 if ((next != NULL) && ((next - end) > 2)) {
 141                         ptr = end + 2;
 142                         while ((ptr < next) &&
 143                                (isspace(*ptr) ||
 144                                 (*ptr == '\r') ||
 145                                 (*ptr == '\n') ||
 146                                 (*ptr == '\t')))
 147                                 ptr ++;
 148                         // did we find a gab just filled with blanks?
 149                         if (ptr == next) {
 150                                 memmove(end + 2, next, len - (next - start));
 151
 152                                 // now terminate the gab at the end
 153                                 delta = (next - end) - 2;
 154                                 len -= delta;
 155                                 buf[len] = '\0';
 156
 157                                 // move next to its new location.
 158                                 next -= delta;
 159                                 nextend -= delta;
 160                         }
 161                 }
 162                 // our next-pair is our new first pair now.
 163                 start = next;
 164                 end = nextend;
 165         }
 166
 167         // Now we handle foreign character sets properly encoded in RFC2047 format.
 168         start = strstr(buf, "=?");
 169         FindNextEnd((start != NULL)? start : buf, end);
 170         while (start != NULL && end != NULL && end > start) {
 171                 extract_token(charset, start, 1, '?', sizeof charset);
 172                 extract_token(encoding, start, 2, '?', sizeof encoding);
 173                 extract_token(istr, start, 3, '?', sizeof istr);
 174
 175                 ibuf = malloc(1024);
 176                 isav = ibuf;
 177                 if (!strcasecmp(encoding, "B")) {       // base64
 178                         ibuflen = CtdlDecodeBase64(ibuf, istr, strlen(istr));
 179                 }
 180                 else if (!strcasecmp(encoding, "Q")) {  // quoted-printable
 181                         size_t len;
 182                         unsigned long pos;
 183
 184                         len = strlen(istr);
 185                         pos = 0;
 186                         while (pos < len) {
 187                                 if (istr[pos] == '_') istr[pos] = ' ';
 188                                 pos++;
 189                         }
 190                         ibuflen = CtdlDecodeQuotedPrintable(ibuf, istr, len);
 191                 }
 192                 else {
 193                         strcpy(ibuf, istr);             // unknown encoding
 194                         ibuflen = strlen(istr);
 195                 }
 196
 197                 ctdl_iconv_open("UTF-8", charset, &ic);
 198                 if (ic != (iconv_t)(-1) ) {
 199                         obuflen = 1024;
 200                         obuf = (char *) malloc(obuflen);
 201                         osav = obuf;
 202                         iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
 203                         osav[1024-obuflen] = 0;
 204
 205                         end = start;
 206                         end++;
 207                         strcpy(start, "");
 208                         remove_token(end, 0, '?');
 209                         remove_token(end, 0, '?');
 210                         remove_token(end, 0, '?');
 211                         remove_token(end, 0, '?');
 212                         strcpy(end, &end[1]);
 213
 214                         snprintf(newbuf, sizeof newbuf, "%s%s%s", buf, osav, end);
 215                         strcpy(buf, newbuf);
 216                         free(osav);
 217                         iconv_close(ic);
 218                 }
 219                 else {
 220                         end = start;
 221                         end++;
 222                         strcpy(start, "");
 223                         remove_token(end, 0, '?');
 224                         remove_token(end, 0, '?');
 225                         remove_token(end, 0, '?');
 226                         remove_token(end, 0, '?');
 227                         strcpy(end, &end[1]);
 228
 229                         snprintf(newbuf, sizeof newbuf, "%s(unreadable)%s", buf, end);
 230                         strcpy(buf, newbuf);
 231                 }
 232
 233                 free(isav);
 234
 235                 // Since spammers will go to all sorts of absurd lengths to get their
 236                 // messages through, there are LOTS of corrupt headers out there.
 237                 // So, prevent a really badly formed RFC2047 header from throwing
 238                 // this function into an infinite loop.
 239                 ++passes;
 240                 if (passes > 20) return;
 241
 242                 start = strstr(buf, "=?");
 243                 FindNextEnd((start != NULL)? start : buf, end);
 244         }
 245
 246 }
 247 #else
 248 inline void utf8ify_rfc822_string(char *a){};
 249
 250 #endif
 251
 252
 253 char *inetcfg = NULL;
 254
 255 // Return nonzero if the supplied name is an alias for this host.
 256 int CtdlHostAlias(char *fqdn) {
 257         int config_lines;
 258         int i;
 259         char buf[256];
 260         char host[256], type[256];
 261         int found = 0;
 262
 263         if (fqdn == NULL)                                       return(hostalias_nomatch);
 264         if (IsEmptyStr(fqdn))                                   return(hostalias_nomatch);
 265         if (!strcasecmp(fqdn, "localhost"))                     return(hostalias_localhost);
 266         if (!strcasecmp(fqdn, CtdlGetConfigStr("c_fqdn")))      return(hostalias_localhost);
 267         if (!strcasecmp(fqdn, CtdlGetConfigStr("c_nodename")))  return(hostalias_localhost);
 268         if (inetcfg == NULL)                                    return(hostalias_nomatch);
 269
 270         config_lines = num_tokens(inetcfg, '\n');
 271         for (i=0; i<config_lines; ++i) {
 272                 extract_token(buf, inetcfg, i, '\n', sizeof buf);
 273                 extract_token(host, buf, 0, '|', sizeof host);
 274                 extract_token(type, buf, 1, '|', sizeof type);
 275
 276                 found = 0;
 277
 278                 // Process these in a specific order, in case there are multiple matches.
 279                 // We want localhost to override masq, for example.
 280
 281                 if ( (!strcasecmp(type, "masqdomain")) && (!strcasecmp(fqdn, host))) {
 282                         found = hostalias_masq;
 283                 }
 284
 285                 if ( (!strcasecmp(type, "localhost")) && (!strcasecmp(fqdn, host))) {
 286                         found = hostalias_localhost;
 287                 }
 288
 289                 // "directory" used to be a distributed version of "localhost" but they're both the same now
 290                 if ( (!strcasecmp(type, "directory")) && (!strcasecmp(fqdn, host))) {
 291                         found = hostalias_localhost;
 292                 }
 293
 294                 if (found) return(found);
 295         }
 296         return(hostalias_nomatch);
 297 }
 298
 299
 300 // Determine whether a given Internet address belongs to the current user
 301 int CtdlIsMe(char *addr, int addr_buf_len) {
 302         struct recptypes *recp;
 303         int i;
 304
 305         recp = validate_recipients(addr, NULL, 0);
 306         if (recp == NULL) return(0);
 307
 308         if (recp->num_local == 0) {
 309                 free_recipients(recp);
 310                 return(0);
 311         }
 312
 313         for (i=0; i<recp->num_local; ++i) {
 314                 extract_token(addr, recp->recp_local, i, '|', addr_buf_len);
 315                 if (!strcasecmp(addr, CC->user.fullname)) {
 316                         free_recipients(recp);
 317                         return(1);
 318                 }
 319         }
 320
 321         free_recipients(recp);
 322         return(0);
 323 }
 324
 325
 326 // If the last item in a list of recipients was truncated to a partial address,
 327 // remove it completely in order to avoid choking library functions.
 328 void sanitize_truncated_recipient(char *str) {
 329         if (!str) return;
 330         if (num_tokens(str, ',') < 2) return;
 331
 332         int len = strlen(str);
 333         if (len < 900) return;
 334         if (len > 998) str[998] = 0;
 335
 336         char *cptr = strrchr(str, ',');
 337         if (!cptr) return;
 338
 339         char *lptr = strchr(cptr, '<');
 340         char *rptr = strchr(cptr, '>');
 341
 342         if ( (lptr) && (rptr) && (rptr > lptr) ) return;
 343
 344         *cptr = 0;
 345 }
 346
 347
 348 // This function is self explanatory.
 349 // (What can I say, I'm in a weird mood today...)
 350 void remove_any_whitespace_to_the_left_or_right_of_at_symbol(char *name) {
 351         char *ptr;
 352         if (!name) return;
 353
 354         for (ptr=name; *ptr; ++ptr) {
 355                 while ( (isspace(*ptr)) && (*(ptr+1)=='@') ) {
 356                         strcpy(ptr, ptr+1);
 357                         if (ptr > name) --ptr;
 358                 }
 359                 while ( (*ptr=='@') && (*(ptr+1)!=0) && (isspace(*(ptr+1))) ) {
 360                         strcpy(ptr+1, ptr+2);
 361                 }
 362         }
 363 }
 364
 365
 366 // values that can be returned by expand_aliases()
 367 enum {
 368         EA_ERROR,               // Can't send message due to bad address
 369         EA_MULTIPLE,            // Alias expanded into multiple recipients -- run me again!
 370         EA_LOCAL,               // Local message, do no network processing
 371         EA_INTERNET,            // Convert msg and send as Internet mail
 372         EA_SKIP                 // This recipient has been invalidated -- skip it!
 373 };
 374
 375
 376 // Process alias and routing info for email addresses
 377 int expand_aliases(char *name, char *aliases) {
 378         int a;
 379         char aaa[SIZ];
 380         int at = 0;
 381
 382         if (aliases) {
 383                 int num_aliases = num_tokens(aliases, '\n');
 384                 for (a=0; a<num_aliases; ++a) {
 385                         extract_token(aaa, aliases, a, '\n', sizeof aaa);
 386                         char *bar = strchr(aaa, '|');
 387                         if (bar) {
 388                                 bar[0] = 0;
 389                                 ++bar;
 390                                 striplt(aaa);
 391                                 striplt(bar);
 392                                 if ( (!IsEmptyStr(aaa)) && (!strcasecmp(name, aaa)) ) {
 393                                         syslog(LOG_DEBUG, "internet_addressing: global alias <%s> to <%s>", name, bar);
 394                                         strcpy(name, bar);
 395                                 }
 396                         }
 397                 }
 398                 if (strchr(name, ',')) {
 399                         return(EA_MULTIPLE);
 400                 }
 401         }
 402
 403         char original_name[256];                                // Now go for the regular aliases
 404         safestrncpy(original_name, name, sizeof original_name);
 405
 406         // should these checks still be here, or maybe move them to split_recps() ?
 407         striplt(name);
 408         remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
 409         stripallbut(name, '<', '>');
 410
 411         // Hit the email address directory
 412         if (CtdlDirectoryLookup(aaa, name, sizeof aaa) == 0) {
 413                 strcpy(name, aaa);
 414         }
 415
 416         if (strcasecmp(original_name, name)) {
 417                 syslog(LOG_INFO, "internet_addressing: directory alias <%s> to <%s>", original_name, name);
 418         }
 419
 420         // Change "user @ xxx" to "user" if xxx is an alias for this host
 421         for (a=0; name[a] != '\0'; ++a) {
 422                 if (name[a] == '@') {
 423                         if (CtdlHostAlias(&name[a+1]) == hostalias_localhost) {
 424                                 name[a] = 0;
 425                                 syslog(LOG_DEBUG, "internet_addressing: host is local, recipient is <%s>", name);
 426                                 break;
 427                         }
 428                 }
 429         }
 430
 431         // Is this a local or remote recipient?
 432         at = haschar(name, '@');
 433         if (at == 0) {
 434                 return(EA_LOCAL);                       // no @'s = local address
 435         }
 436         else if (at == 1) {
 437                 return(EA_INTERNET);                    // one @ = internet address
 438         }
 439         else {
 440                 return(EA_ERROR);                       // more than one @ = badly formed address
 441         }
 442 }
 443
 444
 445 // Return a supplied list of email addresses as an array, removing superfluous information and syntax.
 446 // If an existing Array is supplied as "append_to" it will do so; otherwise a new Array is allocated.
 447 Array *split_recps(char *addresses, Array *append_to) {
 448
 449         if (IsEmptyStr(addresses)) {            // nothing supplied, nothing returned
 450                 return(NULL);
 451         }
 452
 453         // Copy the supplied address list into our own memory space, because we are going to modify it.
 454         char *a = strdup(addresses);
 455         if (a == NULL) {
 456                 syslog(LOG_ERR, "internet_addressing: malloc() failed: %m");
 457                 return(NULL);
 458         }
 459
 460         // Strip out anything in double quotes
 461         char *l = NULL;
 462         char *r = NULL;
 463         do {
 464                 l = strchr(a, '\"');
 465                 r = strrchr(a, '\"');
 466                 if (r > l) {
 467                         strcpy(l, r+1);
 468                 }
 469         } while (r > l);
 470
 471         // Transform all qualifying delimiters to commas
 472         char *t;
 473         for (t=a; t[0]; ++t) {
 474                 if ((t[0]==';') || (t[0]=='|')) {
 475                         t[0]=',';
 476                 }
 477         }
 478
 479         // Tokenize the recipients into an array.  No single recipient should be larger than 256 bytes.
 480         Array *recipients_array = NULL;
 481         if (append_to) {
 482                 recipients_array = append_to;                   // Append to an existing array of recipients
 483         }
 484         else {
 485                 recipients_array = array_new(256);              // This is a new array of recipients
 486         }
 487
 488         int num_addresses = num_tokens(a, ',');
 489         int i;
 490         for (i=0; i<num_addresses; ++i) {
 491                 char this_address[256];
 492                 extract_token(this_address, a, i, ',', sizeof this_address);
 493                 striplt(this_address);                          // strip leading and trailing whitespace
 494                 stripout(this_address, '(', ')');               // remove any portion in parentheses
 495                 stripallbut(this_address, '<', '>');            // if angle brackets are present, keep only what is inside them
 496                 if (!IsEmptyStr(this_address)) {
 497                         array_append(recipients_array, this_address);
 498                 }
 499         }
 500
 501         free(a);                                                // We don't need this buffer anymore.
 502         return(recipients_array);                               // Return the completed array to the caller.
 503 }
 504
 505
 506 // Validate recipients, count delivery types and errors, and handle aliasing
 507 //
 508 // Returns 0 if all addresses are ok, ret->num_error = -1 if no addresses
 509 // were specified, or the number of addresses found invalid.
 510 //
 511 // Caller needs to free the result using free_recipients()
 512 //
 513 struct recptypes *validate_recipients(char *supplied_recipients, const char *RemoteIdentifier, int Flags) {
 514         struct recptypes *ret;
 515         char *recipients = NULL;
 516         char append[SIZ];
 517         long len;
 518         int mailtype;
 519         int invalid;
 520         struct ctdluser tempUS;
 521         struct ctdlroom original_room;
 522         int err = 0;
 523         char errmsg[SIZ];
 524         char *org_recp;
 525         char this_recp[256];
 526
 527         ret = (struct recptypes *) malloc(sizeof(struct recptypes));                    // Initialize
 528         if (ret == NULL) return(NULL);
 529         memset(ret, 0, sizeof(struct recptypes));                                       // set all values to null/zero
 530
 531         if (supplied_recipients == NULL) {
 532                 recipients = strdup("");
 533         }
 534         else {
 535                 recipients = strdup(supplied_recipients);
 536         }
 537
 538         len = strlen(recipients) + 1024;                                                // allocate memory
 539         ret->errormsg = malloc(len);
 540         ret->recp_local = malloc(len);
 541         ret->recp_internet = malloc(len);
 542         ret->recp_room = malloc(len);
 543         ret->display_recp = malloc(len);
 544         ret->recp_orgroom = malloc(len);
 545
 546         ret->errormsg[0] = 0;
 547         ret->recp_local[0] = 0;
 548         ret->recp_internet[0] = 0;
 549         ret->recp_room[0] = 0;
 550         ret->recp_orgroom[0] = 0;
 551         ret->display_recp[0] = 0;
 552         ret->recptypes_magic = RECPTYPES_MAGIC;
 553
 554         Array *recp_array = split_recps(supplied_recipients, NULL);
 555
 556         char *aliases = CtdlGetSysConfig(GLOBAL_ALIASES);                               // First hit the Global Alias Table
 557
 558         int r;
 559         for (r=0; (recp_array && r<array_len(recp_array)); ++r) {
 560                 org_recp = (char *)array_get_element_at(recp_array, r);
 561                 strncpy(this_recp, org_recp, sizeof this_recp);
 562
 563                 int i;
 564                 for (i=0; i<3; ++i) {                                           // pass three times through the aliaser
 565                         mailtype = expand_aliases(this_recp, aliases);
 566
 567                         // If an alias expanded to multiple recipients, strip off those recipients and append them
 568                         // to the end of the array.  This loop will hit those again when it gets there.
 569                         if (mailtype == EA_MULTIPLE) {
 570                                 recp_array = split_recps(this_recp, recp_array);
 571                         }
 572                 }
 573
 574                 // This loop searches for duplicate recipients in the final list and marks them to be skipped.
 575                 int j;
 576                 for (j=0; j<r; ++j) {
 577                         if (!strcasecmp(this_recp, (char *)array_get_element_at(recp_array, j) )) {
 578                                 mailtype = EA_SKIP;
 579                         }
 580                 }
 581
 582                 syslog(LOG_DEBUG, "Recipient #%d of type %d is <%s>", r, mailtype, this_recp);
 583                 invalid = 0;
 584                 errmsg[0] = 0;
 585                 switch(mailtype) {
 586                 case EA_LOCAL:                                  // There are several types of "local" recipients.
 587
 588                         // Old BBS conventions require mail to "sysop" to go somewhere.  Send it to the admin room.
 589                         if (!strcasecmp(this_recp, "sysop")) {
 590                                 ++ret->num_room;
 591                                 strcpy(this_recp, CtdlGetConfigStr("c_aideroom"));
 592                                 if (!IsEmptyStr(ret->recp_room)) {
 593                                         strcat(ret->recp_room, "|");
 594                                 }
 595                                 strcat(ret->recp_room, this_recp);
 596                         }
 597
 598                         // This handles rooms which can receive posts via email.
 599                         else if (!strncasecmp(this_recp, "room_", 5)) {
 600                                 original_room = CC->room;                               // Remember where we parked
 601
 602                                 char mail_to_room[ROOMNAMELEN];
 603                                 char *m;
 604                                 strncpy(mail_to_room, &this_recp[5], sizeof mail_to_room);
 605                                 for (m = mail_to_room; *m; ++m) {
 606                                         if (m[0] == '_') m[0]=' ';
 607                                 }
 608                                 if (!CtdlGetRoom(&CC->room, mail_to_room)) {            // Find the room they asked for
 609
 610                                         err = CtdlDoIHavePermissionToPostInThisRoom(    // check for write permissions to room
 611                                                 errmsg,
 612                                                 sizeof errmsg,
 613                                                 RemoteIdentifier,
 614                                                 Flags,
 615                                                 0                                       // 0 means "this is not a reply"
 616                                         );
 617                                         if (err) {
 618                                                 ++ret->num_error;
 619                                                 invalid = 1;
 620                                         }
 621                                         else {
 622                                                 ++ret->num_room;
 623                                                 if (!IsEmptyStr(ret->recp_room)) {
 624                                                         strcat(ret->recp_room, "|");
 625                                                 }
 626                                                 strcat(ret->recp_room, CC->room.QRname);
 627
 628                                                 if (!IsEmptyStr(ret->recp_orgroom)) {
 629                                                         strcat(ret->recp_orgroom, "|");
 630                                                 }
 631                                                 strcat(ret->recp_orgroom, this_recp);
 632
 633                                         }
 634                                 }
 635                                 else {                                                  // no such room exists
 636                                         ++ret->num_error;
 637                                         invalid = 1;
 638                                 }
 639
 640                                 // Restore this session's original room location.
 641                                 CC->room = original_room;
 642
 643                         }
 644
 645                         // This handles the most common case, which is mail to a user's inbox.
 646                         else if (CtdlGetUser(&tempUS, this_recp) == 0) {
 647                                 ++ret->num_local;
 648                                 strcpy(this_recp, tempUS.fullname);
 649                                 if (!IsEmptyStr(ret->recp_local)) {
 650                                         strcat(ret->recp_local, "|");
 651                                 }
 652                                 strcat(ret->recp_local, this_recp);
 653                         }
 654
 655                         // No match for this recipient
 656                         else {
 657                                 ++ret->num_error;
 658                                 invalid = 1;
 659                         }
 660                         break;
 661                 case EA_INTERNET:
 662                         // Yes, you're reading this correctly: if the target domain points back to the local system,
 663                         // the address is invalid.  That's because if the address were valid, we would have
 664                         // already translated it to a local address by now.
 665                         if (IsDirectory(this_recp, 0)) {
 666                                 ++ret->num_error;
 667                                 invalid = 1;
 668                         }
 669                         else {
 670                                 ++ret->num_internet;
 671                                 if (!IsEmptyStr(ret->recp_internet)) {
 672                                         strcat(ret->recp_internet, "|");
 673                                 }
 674                                 strcat(ret->recp_internet, this_recp);
 675                         }
 676                         break;
 677                 case EA_MULTIPLE:
 678                 case EA_SKIP:
 679                         // no action required, anything in this slot has already been processed elsewhere
 680                         break;
 681                 case EA_ERROR:
 682                         ++ret->num_error;
 683                         invalid = 1;
 684                         break;
 685                 }
 686                 if (invalid) {
 687                         if (IsEmptyStr(errmsg)) {
 688                                 snprintf(append, sizeof append, "Invalid recipient: %s", this_recp);
 689                         }
 690                         else {
 691                                 snprintf(append, sizeof append, "%s", errmsg);
 692                         }
 693                         if ( (strlen(ret->errormsg) + strlen(append) + 3) < SIZ) {
 694                                 if (!IsEmptyStr(ret->errormsg)) {
 695                                         strcat(ret->errormsg, "; ");
 696                                 }
 697                                 strcat(ret->errormsg, append);
 698                         }
 699                 }
 700                 else {
 701                         if (IsEmptyStr(ret->display_recp)) {
 702                                 strcpy(append, this_recp);
 703                         }
 704                         else {
 705                                 snprintf(append, sizeof append, ", %s", this_recp);
 706                         }
 707                         if ( (strlen(ret->display_recp)+strlen(append)) < SIZ) {
 708                                 strcat(ret->display_recp, append);
 709                         }
 710                 }
 711         }
 712
 713         if (aliases != NULL) {          // ok, we're done with the global alias list now
 714                 free(aliases);
 715         }
 716
 717         if ( (ret->num_local + ret->num_internet + ret->num_room + ret->num_error) == 0) {
 718                 ret->num_error = (-1);
 719                 strcpy(ret->errormsg, "No recipients specified.");
 720         }
 721
 722         syslog(LOG_DEBUG, "internet_addressing: validate_recipients() = %d local, %d room, %d SMTP, %d error",
 723                 ret->num_local, ret->num_room, ret->num_internet, ret->num_error
 724         );
 725
 726         free(recipients);
 727         if (recp_array) {
 728                 array_free(recp_array);
 729         }
 730
 731         return(ret);
 732 }
 733
 734
 735 // Destructor for recptypes
 736 void free_recipients(struct recptypes *valid) {
 737
 738         if (valid == NULL) {
 739                 return;
 740         }
 741
 742         if (valid->recptypes_magic != RECPTYPES_MAGIC) {
 743                 syslog(LOG_ERR, "internet_addressing: attempt to call free_recipients() on some other data type!");
 744                 abort();
 745         }
 746
 747         if (valid->errormsg != NULL)            free(valid->errormsg);
 748         if (valid->recp_local != NULL)          free(valid->recp_local);
 749         if (valid->recp_internet != NULL)       free(valid->recp_internet);
 750         if (valid->recp_room != NULL)           free(valid->recp_room);
 751         if (valid->recp_orgroom != NULL)        free(valid->recp_orgroom);
 752         if (valid->display_recp != NULL)        free(valid->display_recp);
 753         if (valid->bounce_to != NULL)           free(valid->bounce_to);
 754         if (valid->envelope_from != NULL)       free(valid->envelope_from);
 755         if (valid->sending_room != NULL)        free(valid->sending_room);
 756         free(valid);
 757 }
 758
 759
 760 char *qp_encode_email_addrs(char *source) {
 761         char *user, *node, *name;
 762         const char headerStr[] = "=?UTF-8?Q?";
 763         char *Encoded;
 764         char *EncodedName;
 765         char *nPtr;
 766         int need_to_encode = 0;
 767         long SourceLen;
 768         long EncodedMaxLen;
 769         long nColons = 0;
 770         long *AddrPtr;
 771         long *AddrUtf8;
 772         long nAddrPtrMax = 50;
 773         long nmax;
 774         int InQuotes = 0;
 775         int i, n;
 776
 777         if (source == NULL) return source;
 778         if (IsEmptyStr(source)) return source;
 779         syslog(LOG_DEBUG, "internet_addressing: qp_encode_email_addrs <%s>", source);
 780
 781         AddrPtr = malloc (sizeof (long) * nAddrPtrMax);
 782         AddrUtf8 = malloc (sizeof (long) * nAddrPtrMax);
 783         memset(AddrUtf8, 0, sizeof (long) * nAddrPtrMax);
 784         *AddrPtr = 0;
 785         i = 0;
 786         while (!IsEmptyStr (&source[i])) {
 787                 if (nColons >= nAddrPtrMax){
 788                         long *ptr;
 789
 790                         ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
 791                         memcpy (ptr, AddrPtr, sizeof (long) * nAddrPtrMax);
 792                         free (AddrPtr), AddrPtr = ptr;
 793
 794                         ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
 795                         memset(&ptr[nAddrPtrMax], 0, sizeof (long) * nAddrPtrMax);
 796
 797                         memcpy (ptr, AddrUtf8, sizeof (long) * nAddrPtrMax);
 798                         free (AddrUtf8), AddrUtf8 = ptr;
 799                         nAddrPtrMax *= 2;
 800                 }
 801                 if (((unsigned char) source[i] < 32) || ((unsigned char) source[i] > 126)) {
 802                         need_to_encode = 1;
 803                         AddrUtf8[nColons] = 1;
 804                 }
 805                 if (source[i] == '"') {
 806                         InQuotes = !InQuotes;
 807                 }
 808                 if (!InQuotes && source[i] == ',') {
 809                         AddrPtr[nColons] = i;
 810                         nColons++;
 811                 }
 812                 i++;
 813         }
 814         if (need_to_encode == 0) {
 815                 free(AddrPtr);
 816                 free(AddrUtf8);
 817                 return source;
 818         }
 819
 820         SourceLen = i;
 821         EncodedMaxLen = nColons * (sizeof(headerStr) + 3) + SourceLen * 3;
 822         Encoded = (char*) malloc (EncodedMaxLen);
 823
 824         for (i = 0; i < nColons; i++) {
 825                 source[AddrPtr[i]++] = '\0';
 826         }
 827         // TODO: if libidn, this might get larger
 828         user = malloc(SourceLen + 1);
 829         node = malloc(SourceLen + 1);
 830         name = malloc(SourceLen + 1);
 831
 832         nPtr = Encoded;
 833         *nPtr = '\0';
 834         for (i = 0; i < nColons && nPtr != NULL; i++) {
 835                 nmax = EncodedMaxLen - (nPtr - Encoded);
 836                 if (AddrUtf8[i]) {
 837                         process_rfc822_addr(&source[AddrPtr[i]], user, node, name);
 838                         // TODO: libIDN here !
 839                         if (IsEmptyStr(name)) {
 840                                 n = snprintf(nPtr, nmax, (i==0)?"%s@%s" : ",%s@%s", user, node);
 841                         }
 842                         else {
 843                                 EncodedName = rfc2047encode(name, strlen(name));
 844                                 n = snprintf(nPtr, nmax, (i==0)?"%s <%s@%s>" : ",%s <%s@%s>", EncodedName, user, node);
 845                                 free(EncodedName);
 846                         }
 847                 }
 848                 else {
 849                         n = snprintf(nPtr, nmax, (i==0)?"%s" : ",%s", &source[AddrPtr[i]]);
 850                 }
 851                 if (n > 0 )
 852                         nPtr += n;
 853                 else {
 854                         char *ptr, *nnPtr;
 855                         ptr = (char*) malloc(EncodedMaxLen * 2);
 856                         memcpy(ptr, Encoded, EncodedMaxLen);
 857                         nnPtr = ptr + (nPtr - Encoded), nPtr = nnPtr;
 858                         free(Encoded), Encoded = ptr;
 859                         EncodedMaxLen *= 2;
 860                         i--; // do it once more with properly lengthened buffer
 861                 }
 862         }
 863         for (i = 0; i < nColons; i++)
 864                 source[--AddrPtr[i]] = ',';
 865
 866         free(user);
 867         free(node);
 868         free(name);
 869         free(AddrUtf8);
 870         free(AddrPtr);
 871         return Encoded;
 872 }
 873
 874
 875 // Unfold a multi-line field into a single line, removing multi-whitespaces
 876 void unfold_rfc822_field(char **field, char **FieldEnd)
 877 {
 878         int quote = 0;
 879         char *pField = *field;
 880         char *sField;
 881         char *pFieldEnd = *FieldEnd;
 882
 883         while (isspace(*pField))
 884                 pField++;
 885         // remove leading/trailing whitespace
 886         ;
 887
 888         while (isspace(*pFieldEnd))
 889                 pFieldEnd --;
 890
 891         *FieldEnd = pFieldEnd;
 892         // convert non-space whitespace to spaces, and remove double blanks
 893         for (sField = *field = pField;
 894              sField < pFieldEnd;
 895              pField++, sField++)
 896         {
 897                 if ((*sField=='\r') || (*sField=='\n'))
 898                 {
 899                         int offset = 1;
 900                         while ( ( (*(sField + offset) == '\r') || (*(sField + offset) == '\n' )) && (sField + offset < pFieldEnd) ) {
 901                                 offset ++;
 902                         }
 903                         sField += offset;
 904                         *pField = *sField;
 905                 }
 906                 else {
 907                         if (*sField=='\"') quote = 1 - quote;
 908                         if (!quote) {
 909                                 if (isspace(*sField)) {
 910                                         *pField = ' ';
 911                                         pField++;
 912                                         sField++;
 913
 914                                         while ((sField < pFieldEnd) &&
 915                                                isspace(*sField))
 916                                                 sField++;
 917                                         *pField = *sField;
 918                                 }
 919                                 else *pField = *sField;
 920                         }
 921                         else *pField = *sField;
 922                 }
 923         }
 924         *pField = '\0';
 925         *FieldEnd = pField - 1;
 926 }
 927
 928
 929 // Split an RFC822-style address into userid, host, and full name
 930 //
 931 // Note: This still handles obsolete address syntaxes such as user%node@node and ...node!user
 932 //       We should probably remove that.
 933 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name) {
 934         int a;
 935
 936         strcpy(user, "");
 937         strcpy(node, CtdlGetConfigStr("c_fqdn"));
 938         strcpy(name, "");
 939
 940         if (rfc822 == NULL) return;
 941
 942         // extract full name - first, it's From minus <userid>
 943         strcpy(name, rfc822);
 944         stripout(name, '<', '>');
 945
 946         // strip anything to the left of a bang
 947         while ((!IsEmptyStr(name)) && (haschar(name, '!') > 0))
 948                 strcpy(name, &name[1]);
 949
 950         // and anything to the right of a @ or %
 951         for (a = 0; name[a] != '\0'; ++a) {
 952                 if (name[a] == '@') {
 953                         name[a] = 0;
 954                         break;
 955                 }
 956                 if (name[a] == '%') {
 957                         name[a] = 0;
 958                         break;
 959                 }
 960         }
 961
 962         // but if there are parentheses, that changes the rules...
 963         if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
 964                 strcpy(name, rfc822);
 965                 stripallbut(name, '(', ')');
 966         }
 967
 968         // but if there are a set of quotes, that supersedes everything
 969         if (haschar(rfc822, 34) == 2) {
 970                 strcpy(name, rfc822);
 971                 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
 972                         strcpy(&name[0], &name[1]);
 973                 }
 974                 strcpy(&name[0], &name[1]);
 975                 for (a = 0; name[a] != '\0'; ++a)
 976                         if (name[a] == 34) {
 977                                 name[a] = 0;
 978                                 break;
 979                         }
 980         }
 981         // extract user id
 982         strcpy(user, rfc822);
 983
 984         // first get rid of anything in parens
 985         stripout(user, '(', ')');
 986
 987         // if there's a set of angle brackets, strip it down to that
 988         if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
 989                 stripallbut(user, '<', '>');
 990         }
 991
 992         // strip anything to the left of a bang
 993         while ((!IsEmptyStr(user)) && (haschar(user, '!') > 0))
 994                 strcpy(user, &user[1]);
 995
 996         // and anything to the right of a @ or %
 997         for (a = 0; user[a] != '\0'; ++a) {
 998                 if (user[a] == '@') {
 999                         user[a] = 0;
1000                         break;
1001                 }
1002                 if (user[a] == '%') {
1003                         user[a] = 0;
1004                         break;
1005                 }
1006         }
1007
1008
1009         // extract node name
1010         strcpy(node, rfc822);
1011
1012         // first get rid of anything in parens
1013         stripout(node, '(', ')');
1014
1015         // if there's a set of angle brackets, strip it down to that
1016         if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
1017                 stripallbut(node, '<', '>');
1018         }
1019
1020         // If no node specified, tack ours on instead
1021         if (
1022                 (haschar(node, '@')==0)
1023                 && (haschar(node, '%')==0)
1024                 && (haschar(node, '!')==0)
1025         ) {
1026                 strcpy(node, CtdlGetConfigStr("c_nodename"));
1027         }
1028         else {
1029
1030                 // strip anything to the left of a @
1031                 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0))
1032                         strcpy(node, &node[1]);
1033
1034                 // strip anything to the left of a %
1035                 while ((!IsEmptyStr(node)) && (haschar(node, '%') > 0))
1036                         strcpy(node, &node[1]);
1037
1038                 // reduce multiple system bang paths to node!user
1039                 while ((!IsEmptyStr(node)) && (haschar(node, '!') > 1))
1040                         strcpy(node, &node[1]);
1041
1042                 // now get rid of the user portion of a node!user string
1043                 for (a = 0; node[a] != '\0'; ++a)
1044                         if (node[a] == '!') {
1045                                 node[a] = 0;
1046                                 break;
1047                         }
1048         }
1049
1050         // strip leading and trailing spaces in all strings
1051         striplt(user);
1052         striplt(node);
1053         striplt(name);
1054
1055         // If we processed a string that had the address in angle brackets
1056         // but no name outside the brackets, we now have an empty name.  In
1057         // this case, use the user portion of the address as the name.
1058         if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
1059                 strcpy(name, user);
1060         }
1061 }
1062
1063
1064 // convert_field() is a helper function for convert_internet_message().
1065 // Given start/end positions for an rfc822 field, it converts it to a Citadel
1066 // field if it wants to, and unfolds it if necessary.
1067 //
1068 // Returns 1 if the field was converted and inserted into the Citadel message
1069 // structure, implying that the source field should be removed from the
1070 // message text.
1071 int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
1072         char *key, *value, *valueend;
1073         long len;
1074         const char *pos;
1075         int i;
1076         const char *colonpos = NULL;
1077         int processed = 0;
1078         char user[1024];
1079         char node[1024];
1080         char name[1024];
1081         char addr[1024];
1082         time_t parsed_date;
1083         long valuelen;
1084
1085         for (pos = end; pos >= beg; pos--) {
1086                 if (*pos == ':') colonpos = pos;
1087         }
1088
1089         if (colonpos == NULL) return(0);        /* no colon? not a valid header line */
1090
1091         len = end - beg;
1092         key = malloc(len + 2);
1093         memcpy(key, beg, len + 1);
1094         key[len] = '\0';
1095         valueend = key + len;
1096         * ( key + (colonpos - beg) ) = '\0';
1097         value = &key[(colonpos - beg) + 1];
1098         // printf("Header: [%s]\nValue: [%s]\n", key, value);
1099         unfold_rfc822_field(&value, &valueend);
1100         valuelen = valueend - value + 1;
1101         // printf("UnfoldedValue: [%s]\n", value);
1102
1103         // Here's the big rfc822-to-citadel loop.
1104
1105         // Date/time is converted into a unix timestamp.  If the conversion
1106         // fails, we replace it with the time the message arrived locally.
1107         if (!strcasecmp(key, "Date")) {
1108                 parsed_date = parsedate(value);
1109                 if (parsed_date < 0L) parsed_date = time(NULL);
1110
1111                 if (CM_IsEmpty(msg, eTimestamp))
1112                         CM_SetFieldLONG(msg, eTimestamp, parsed_date);
1113                 processed = 1;
1114         }
1115
1116         else if (!strcasecmp(key, "From")) {
1117                 process_rfc822_addr(value, user, node, name);
1118                 syslog(LOG_DEBUG, "internet_addressing: converted to <%s@%s> (%s)", user, node, name);
1119                 snprintf(addr, sizeof(addr), "%s@%s", user, node);
1120                 if (CM_IsEmpty(msg, eAuthor) && !IsEmptyStr(name)) {
1121                         CM_SetField(msg, eAuthor, name, -1);
1122                 }
1123                 if (CM_IsEmpty(msg, erFc822Addr) && !IsEmptyStr(addr)) {
1124                         CM_SetField(msg, erFc822Addr, addr, -1);
1125                 }
1126                 processed = 1;
1127         }
1128
1129         else if (!strcasecmp(key, "Subject")) {
1130                 if (CM_IsEmpty(msg, eMsgSubject))
1131                         CM_SetField(msg, eMsgSubject, value, valuelen);
1132                 processed = 1;
1133         }
1134
1135         else if (!strcasecmp(key, "List-ID")) {
1136                 if (CM_IsEmpty(msg, eListID))
1137                         CM_SetField(msg, eListID, value, valuelen);
1138                 processed = 1;
1139         }
1140
1141         else if (!strcasecmp(key, "To")) {
1142                 if (CM_IsEmpty(msg, eRecipient))
1143                         CM_SetField(msg, eRecipient, value, valuelen);
1144                 processed = 1;
1145         }
1146
1147         else if (!strcasecmp(key, "CC")) {
1148                 if (CM_IsEmpty(msg, eCarbonCopY))
1149                         CM_SetField(msg, eCarbonCopY, value, valuelen);
1150                 processed = 1;
1151         }
1152
1153         else if (!strcasecmp(key, "Message-ID")) {
1154                 if (!CM_IsEmpty(msg, emessageId)) {
1155                         syslog(LOG_WARNING, "internet_addressing: duplicate message id");
1156                 }
1157                 else {
1158                         char *pValue;
1159                         long pValueLen;
1160
1161                         pValue = value;
1162                         pValueLen = valuelen;
1163                         // Strip angle brackets
1164                         while (haschar(pValue, '<') > 0) {
1165                                 pValue ++;
1166                                 pValueLen --;
1167                         }
1168
1169                         for (i = 0; i <= pValueLen; ++i)
1170                                 if (pValue[i] == '>') {
1171                                         pValueLen = i;
1172                                         break;
1173                                 }
1174
1175                         CM_SetField(msg, emessageId, pValue, pValueLen);
1176                 }
1177
1178                 processed = 1;
1179         }
1180
1181         else if (!strcasecmp(key, "Return-Path")) {
1182                 if (CM_IsEmpty(msg, eMessagePath))
1183                         CM_SetField(msg, eMessagePath, value, valuelen);
1184                 processed = 1;
1185         }
1186
1187         else if (!strcasecmp(key, "Envelope-To")) {
1188                 if (CM_IsEmpty(msg, eenVelopeTo))
1189                         CM_SetField(msg, eenVelopeTo, value, valuelen);
1190                 processed = 1;
1191         }
1192
1193         else if (!strcasecmp(key, "References")) {
1194                 CM_SetField(msg, eWeferences, value, valuelen);
1195                 processed = 1;
1196         }
1197
1198         else if (!strcasecmp(key, "Reply-To")) {
1199                 CM_SetField(msg, eReplyTo, value, valuelen);
1200                 processed = 1;
1201         }
1202
1203         else if (!strcasecmp(key, "In-reply-to")) {
1204                 if (CM_IsEmpty(msg, eWeferences)) // References: supersedes In-reply-to:
1205                         CM_SetField(msg, eWeferences, value, valuelen);
1206                 processed = 1;
1207         }
1208
1209
1210
1211         // Clean up and move on.
1212         free(key);      // Don't free 'value', it's actually the same buffer
1213         return processed;
1214 }
1215
1216
1217 // Convert RFC822 references format (References) to Citadel references format (Weferences)
1218 void convert_references_to_wefewences(char *str) {
1219         int bracket_nesting = 0;
1220         char *ptr = str;
1221         char *moveptr = NULL;
1222         char ch;
1223
1224         while(*ptr) {
1225                 ch = *ptr;
1226                 if (ch == '>') {
1227                         --bracket_nesting;
1228                         if (bracket_nesting < 0) bracket_nesting = 0;
1229                 }
1230                 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
1231                         *ptr = '|';
1232                         ++ptr;
1233                 }
1234                 else if (bracket_nesting > 0) {
1235                         ++ptr;
1236                 }
1237                 else {
1238                         moveptr = ptr;
1239                         while (*moveptr) {
1240                                 *moveptr = *(moveptr+1);
1241                                 ++moveptr;
1242                         }
1243                 }
1244                 if (ch == '<') ++bracket_nesting;
1245         }
1246
1247 }
1248
1249
1250 // Convert an RFC822 message (headers + body) to a CtdlMessage structure.
1251 // NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
1252 // will be deallocated when CM_Free() is called.  Therefore, the
1253 // supplied buffer should be DEREFERENCED.  It should not be freed or used
1254 // again.
1255 struct CtdlMessage *convert_internet_message(char *rfc822) {
1256         StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
1257         free (rfc822);
1258         return convert_internet_message_buf(&RFCBuf);
1259 }
1260
1261
1262 struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822)
1263 {
1264         struct CtdlMessage *msg;
1265         const char *pos, *beg, *end, *totalend;
1266         int done, alldone = 0;
1267         int converted;
1268         StrBuf *OtherHeaders;
1269
1270         msg = malloc(sizeof(struct CtdlMessage));
1271         if (msg == NULL) return msg;
1272
1273         memset(msg, 0, sizeof(struct CtdlMessage));
1274         msg->cm_magic = CTDLMESSAGE_MAGIC;      // self check
1275         msg->cm_anon_type = 0;                  // never anonymous
1276         msg->cm_format_type = FMT_RFC822;       // internet message
1277
1278         pos = ChrPtr(*rfc822);
1279         totalend = pos + StrLength(*rfc822);
1280         done = 0;
1281         OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
1282
1283         while (!alldone) {
1284
1285                 /* Locate beginning and end of field, keeping in mind that
1286                  * some fields might be multiline
1287                  */
1288                 end = beg = pos;
1289
1290                 while ((end < totalend) &&
1291                        (end == beg) &&
1292                        (done == 0) )
1293                 {
1294
1295                         if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) )
1296                         {
1297                                 end = pos;
1298                         }
1299
1300                         /* done with headers? */
1301                         if ((*pos=='\n') &&
1302                             ( (*(pos+1)=='\n') ||
1303                               (*(pos+1)=='\r')) )
1304                         {
1305                                 alldone = 1;
1306                         }
1307
1308                         if (pos >= (totalend - 1) )
1309                         {
1310                                 end = pos;
1311                                 done = 1;
1312                         }
1313
1314                         ++pos;
1315
1316                 }
1317
1318                 /* At this point we have a field.  Are we interested in it? */
1319                 converted = convert_field(msg, beg, end);
1320
1321                 /* Strip the field out of the RFC822 header if we used it */
1322                 if (!converted) {
1323                         StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
1324                         StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1325                 }
1326
1327                 /* If we've hit the end of the message, bail out */
1328                 if (pos >= totalend)
1329                         alldone = 1;
1330         }
1331         StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1332         if (pos < totalend)
1333                 StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
1334         FreeStrBuf(rfc822);
1335         CM_SetAsFieldSB(msg, eMesageText, &OtherHeaders);
1336
1337         /* Follow-up sanity checks... */
1338
1339         /* If there's no timestamp on this message, set it to now. */
1340         if (CM_IsEmpty(msg, eTimestamp)) {
1341                 CM_SetFieldLONG(msg, eTimestamp, time(NULL));
1342         }
1343
1344         /* If a W (references, or rather, Wefewences) field is present, we
1345          * have to convert it from RFC822 format to Citadel format.
1346          */
1347         if (!CM_IsEmpty(msg, eWeferences)) {
1348                 /// todo: API!
1349                 convert_references_to_wefewences(msg->cm_fields[eWeferences]);
1350         }
1351
1352         return msg;
1353 }
1354
1355
1356 /*
1357  * Look for a particular header field in an RFC822 message text.  If the
1358  * requested field is found, it is unfolded (if necessary) and returned to
1359  * the caller.  The field name is stripped out, leaving only its contents.
1360  * The caller is responsible for freeing the returned buffer.  If the requested
1361  * field is not present, or anything else goes wrong, it returns NULL.
1362  */
1363 char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
1364         char *fieldbuf = NULL;
1365         const char *end_of_headers;
1366         const char *field_start;
1367         const char *ptr;
1368         char *cont;
1369         char fieldhdr[SIZ];
1370
1371         /* Should never happen, but sometimes we get stupid */
1372         if (rfc822 == NULL) return(NULL);
1373         if (fieldname == NULL) return(NULL);
1374
1375         snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
1376
1377         /* Locate the end of the headers, so we don't run past that point */
1378         end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
1379         if (end_of_headers == NULL) {
1380                 end_of_headers = cbmstrcasestr(rfc822, "\n\n");
1381         }
1382         if (end_of_headers == NULL) return (NULL);
1383
1384         field_start = cbmstrcasestr(rfc822, fieldhdr);
1385         if (field_start == NULL) return(NULL);
1386         if (field_start > end_of_headers) return(NULL);
1387
1388         fieldbuf = malloc(SIZ);
1389         strcpy(fieldbuf, "");
1390
1391         ptr = field_start;
1392         ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
1393         while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
1394                 strcat(fieldbuf, " ");
1395                 cont = &fieldbuf[strlen(fieldbuf)];
1396                 ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
1397                 striplt(cont);
1398         }
1399
1400         strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
1401         striplt(fieldbuf);
1402
1403         return(fieldbuf);
1404 }
1405
1406
1407 /*****************************************************************************
1408  *                      DIRECTORY MANAGEMENT FUNCTIONS                       *
1409  *****************************************************************************/
1410
1411 /*
1412  * Generate the index key for an Internet e-mail address to be looked up
1413  * in the database.
1414  */
1415 void directory_key(char *key, char *addr) {
1416         int i;
1417         int keylen = 0;
1418
1419         for (i=0; !IsEmptyStr(&addr[i]); ++i) {
1420                 if (!isspace(addr[i])) {
1421                         key[keylen++] = tolower(addr[i]);
1422                 }
1423         }
1424         key[keylen++] = 0;
1425
1426         syslog(LOG_DEBUG, "internet_addressing: directory key is <%s>", key);
1427 }
1428
1429
1430 /*
1431  * Return nonzero if the supplied address is in one of "our" domains
1432  */
1433 int IsDirectory(char *addr, int allow_masq_domains) {
1434         char domain[256];
1435         int h;
1436
1437         extract_token(domain, addr, 1, '@', sizeof domain);
1438         striplt(domain);
1439
1440         h = CtdlHostAlias(domain);
1441
1442         if ( (h == hostalias_masq) && allow_masq_domains)
1443                 return(1);
1444
1445         if (h == hostalias_localhost) {
1446                 return(1);
1447         }
1448         else {
1449                 return(0);
1450         }
1451 }
1452
1453
1454 /*
1455  * Add an Internet e-mail address to the directory for a user
1456  */
1457 int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
1458         char key[SIZ];
1459
1460         if (IsDirectory(internet_addr, 0) == 0) {
1461                 return 0;
1462         }
1463         syslog(LOG_DEBUG, "internet_addressing: create directory entry: %s --> %s", internet_addr, citadel_addr);
1464         directory_key(key, internet_addr);
1465         cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
1466         return 1;
1467 }
1468
1469
1470 /*
1471  * Delete an Internet e-mail address from the directory.
1472  *
1473  * (NOTE: we don't actually use or need the citadel_addr variable; it's merely
1474  * here because the callback API expects to be able to send it.)
1475  */
1476 int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
1477         char key[SIZ];
1478
1479         syslog(LOG_DEBUG, "internet_addressing: delete directory entry: %s --> %s", internet_addr, citadel_addr);
1480         directory_key(key, internet_addr);
1481         return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
1482 }
1483
1484
1485 /*
1486  * Look up an Internet e-mail address in the directory.
1487  * On success: returns 0, and Citadel address stored in 'target'
1488  * On failure: returns nonzero
1489  */
1490 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
1491         struct cdbdata *cdbrec;
1492         char key[SIZ];
1493
1494         /* Dump it in there unchanged, just for kicks */
1495         if (target != NULL) {
1496                 safestrncpy(target, internet_addr, targbuflen);
1497         }
1498
1499         /* Only do lookups for addresses with hostnames in them */
1500         if (num_tokens(internet_addr, '@') != 2) return(-1);
1501
1502         /* Only do lookups for domains in the directory */
1503         if (IsDirectory(internet_addr, 0) == 0) return(-1);
1504
1505         directory_key(key, internet_addr);
1506         cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key) );
1507         if (cdbrec != NULL) {
1508                 if (target != NULL) {
1509                         safestrncpy(target, cdbrec->ptr, targbuflen);
1510                 }
1511                 cdb_free(cdbrec);
1512                 return(0);
1513         }
1514
1515         return(-1);
1516 }
1517
1518
1519 /*
1520  * Harvest any email addresses that someone might want to have in their
1521  * "collected addresses" book.
1522  */
1523 char *harvest_collected_addresses(struct CtdlMessage *msg) {
1524         char *coll = NULL;
1525         char addr[256];
1526         char user[256], node[256], name[256];
1527         int is_harvestable;
1528         int i, j, h;
1529         eMsgField field = 0;
1530
1531         if (msg == NULL) return(NULL);
1532
1533         is_harvestable = 1;
1534         strcpy(addr, "");
1535         if (!CM_IsEmpty(msg, eAuthor)) {
1536                 strcat(addr, msg->cm_fields[eAuthor]);
1537         }
1538         if (!CM_IsEmpty(msg, erFc822Addr)) {
1539                 strcat(addr, " <");
1540                 strcat(addr, msg->cm_fields[erFc822Addr]);
1541                 strcat(addr, ">");
1542                 if (IsDirectory(msg->cm_fields[erFc822Addr], 0)) {
1543                         is_harvestable = 0;
1544                 }
1545         }
1546
1547         if (is_harvestable) {
1548                 coll = strdup(addr);
1549         }
1550         else {
1551                 coll = strdup("");
1552         }
1553
1554         if (coll == NULL) return(NULL);
1555
1556         /* Scan both the R (To) and Y (CC) fields */
1557         for (i = 0; i < 2; ++i) {
1558                 if (i == 0) field = eRecipient;
1559                 if (i == 1) field = eCarbonCopY;
1560
1561                 if (!CM_IsEmpty(msg, field)) {
1562                         for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
1563                                 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
1564                                 if (strstr(addr, "=?") != NULL)
1565                                         utf8ify_rfc822_string(addr);
1566                                 process_rfc822_addr(addr, user, node, name);
1567                                 h = CtdlHostAlias(node);
1568                                 if (h != hostalias_localhost) {
1569                                         coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1570                                         if (coll == NULL) return(NULL);
1571                                         if (!IsEmptyStr(coll)) {
1572                                                 strcat(coll, ",");
1573                                         }
1574                                         striplt(addr);
1575                                         strcat(coll, addr);
1576                                 }
1577                         }
1578                 }
1579         }
1580
1581         if (IsEmptyStr(coll)) {
1582                 free(coll);
1583                 return(NULL);
1584         }
1585         return(coll);
1586 }
1587
1588
1589 /*
1590  * Helper function for CtdlRebuildDirectoryIndex()
1591  */
1592 void CtdlRebuildDirectoryIndex_backend(char *username, void *data) {
1593
1594         int j = 0;
1595         struct ctdluser usbuf;
1596
1597         if (CtdlGetUser(&usbuf, username) != 0) {
1598                 return;
1599         }
1600
1601         if ( (!IsEmptyStr(usbuf.fullname)) && (!IsEmptyStr(usbuf.emailaddrs)) ) {
1602                 for (j=0; j<num_tokens(usbuf.emailaddrs, '|'); ++j) {
1603                         char one_email[512];
1604                         extract_token(one_email, usbuf.emailaddrs, j, '|', sizeof one_email);
1605                         CtdlDirectoryAddUser(one_email, usbuf.fullname);
1606                 }
1607         }
1608 }
1609
1610
1611 /*
1612  * Initialize the directory database (erasing anything already there)
1613  */
1614 void CtdlRebuildDirectoryIndex(void) {
1615         syslog(LOG_INFO, "internet_addressing: rebuilding email address directory index");
1616         cdb_trunc(CDB_DIRECTORY);
1617         ForEachUser(CtdlRebuildDirectoryIndex_backend, NULL);
1618 }
1619
1620
1621 // Configure Internet email addresses for a user account, updating the Directory Index in the process
1622 void CtdlSetEmailAddressesForUser(char *requested_user, char *new_emailaddrs) {
1623         struct ctdluser usbuf;
1624         int i;
1625         char buf[SIZ];
1626
1627         if (CtdlGetUserLock(&usbuf, requested_user) != 0) {     // We can lock because the DirectoryIndex functions don't lock.
1628                 return;                                         // Silently fail here if the specified user does not exist.
1629         }
1630
1631         syslog(LOG_DEBUG, "internet_addressing: setting email addresses for <%s> to <%s>", usbuf.fullname, new_emailaddrs);
1632
1633         // Delete all of the existing directory index records for the user (easier this way)
1634         for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1635                 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1636                 CtdlDirectoryDelUser(buf, requested_user);
1637         }
1638
1639         strcpy(usbuf.emailaddrs, new_emailaddrs);               // make it official.
1640
1641         // Index all of the new email addresses (they've already been sanitized)
1642         for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1643                 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1644                 CtdlDirectoryAddUser(buf, requested_user);
1645         }
1646
1647         CtdlPutUserLock(&usbuf);
1648 }
1649
1650
1651 /*
1652  * Auto-generate an Internet email address for a user account
1653  */
1654 void AutoGenerateEmailAddressForUser(struct ctdluser *user) {
1655         char synthetic_email_addr[1024];
1656         int i, j;
1657         int u = 0;
1658
1659         for (i=0; u==0; ++i) {
1660                 if (i == 0) {
1661                         // first try just converting the user name to lowercase and replacing spaces with underscores
1662                         snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "%s@%s", user->fullname, CtdlGetConfigStr("c_fqdn"));
1663                         for (j=0; ((synthetic_email_addr[j] != '\0')&&(synthetic_email_addr[j] != '@')); j++) {
1664                                 synthetic_email_addr[j] = tolower(synthetic_email_addr[j]);
1665                                 if (!isalnum(synthetic_email_addr[j])) {
1666                                         synthetic_email_addr[j] = '_';
1667                                 }
1668                         }
1669                 }
1670                 else if (i == 1) {
1671                         // then try 'ctdl' followed by the user number
1672                         snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08lx@%s", user->usernum, CtdlGetConfigStr("c_fqdn"));
1673                 }
1674                 else if (i > 1) {
1675                         // oof.  just keep trying other numbers until we find one
1676                         snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08x@%s", i, CtdlGetConfigStr("c_fqdn"));
1677                 }
1678                 u = CtdlDirectoryLookup(NULL, synthetic_email_addr, 0);
1679                 syslog(LOG_DEBUG, "user_ops: address <%s> lookup returned <%d>", synthetic_email_addr, u);
1680         }
1681
1682         CtdlSetEmailAddressesForUser(user->fullname, synthetic_email_addr);
1683         strncpy(CC->user.emailaddrs, synthetic_email_addr, sizeof(user->emailaddrs));
1684         syslog(LOG_DEBUG, "user_ops: auto-generated email address <%s> for <%s>", synthetic_email_addr, user->fullname);
1685 }
1686
1687
1688 // Determine whether the supplied email address is subscribed to the supplied room's mailing list service.
1689 int is_email_subscribed_to_list(char *email, char *room_name) {
1690         struct ctdlroom room;
1691         long roomnum;
1692         char *roomnetconfig;
1693         int found_it = 0;
1694
1695         if (CtdlGetRoom(&room, room_name)) {
1696                 return(0);                                      // room not found, so definitely not subscribed
1697         }
1698
1699         // If this room has the QR2_SMTP_PUBLIC flag set, anyone may email a post to this room, even non-subscribers.
1700         if (room.QRflags2 & QR2_SMTP_PUBLIC) {
1701                 return(1);
1702         }
1703
1704         roomnum = room.QRnumber;
1705         roomnetconfig = LoadRoomNetConfigFile(roomnum);
1706         if (roomnetconfig == NULL) {
1707                 return(0);
1708         }
1709
1710         // We're going to do a very sloppy match here and simply search for the specified email address
1711         // anywhere in the room's netconfig.  If you don't like this, fix it yourself.
1712         if (bmstrcasestr(roomnetconfig, email)) {
1713                 found_it = 1;
1714         }
1715         else {
1716                 found_it = 0;
1717         }
1718
1719         free(roomnetconfig);
1720         return(found_it);
1721 }