citadel/server/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) 1987-2023 by the citadel.org team
   5 //
   6 // This program is open source software.  Use, duplication, or disclosure
   7 // is subject to the terms of the GNU General Public License, version 3.
   8
   9 #include "sysdep.h"
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12 #include <stdio.h>
  13 #include <fcntl.h>
  14 #include <ctype.h>
  15 #include <signal.h>
  16 #include <pwd.h>
  17 #include <errno.h>
  18 #include <sys/types.h>
  19 #include <time.h>
  20 #include <sys/wait.h>
  21 #include <string.h>
  22 #include <limits.h>
  23 #include <libcitadel.h>
  24 #include "citadel_defs.h"
  25 #include "server.h"
  26 #include "sysdep_decls.h"
  27 #include "citserver.h"
  28 #include "support.h"
  29 #include "config.h"
  30 #include "msgbase.h"
  31 #include "internet_addressing.h"
  32 #include "user_ops.h"
  33 #include "room_ops.h"
  34 #include "parsedate.h"
  35 #include "database.h"
  36 #include "ctdl_module.h"
  37
  38
  39
  40 char *inetcfg = NULL;
  41
  42 // Return nonzero if the supplied name is an alias for this host.
  43 int CtdlHostAlias(char *fqdn) {
  44         int config_lines;
  45         int i;
  46         char buf[256];
  47         char host[256], type[256];
  48         int found = 0;
  49
  50         if (fqdn == NULL)                                       return(hostalias_nomatch);
  51         if (IsEmptyStr(fqdn))                                   return(hostalias_nomatch);
  52         if (!strcasecmp(fqdn, "localhost"))                     return(hostalias_localhost);
  53         if (!strcasecmp(fqdn, CtdlGetConfigStr("c_fqdn")))      return(hostalias_localhost);
  54         if (!strcasecmp(fqdn, CtdlGetConfigStr("c_nodename")))  return(hostalias_localhost);
  55         if (inetcfg == NULL)                                    return(hostalias_nomatch);
  56
  57         config_lines = num_tokens(inetcfg, '\n');
  58         for (i=0; i<config_lines; ++i) {
  59                 extract_token(buf, inetcfg, i, '\n', sizeof buf);
  60                 extract_token(host, buf, 0, '|', sizeof host);
  61                 extract_token(type, buf, 1, '|', sizeof type);
  62
  63                 found = 0;
  64
  65                 // Process these in a specific order, in case there are multiple matches.
  66                 // We want localhost to override masq, for example.
  67
  68                 if ( (!strcasecmp(type, "masqdomain")) && (!strcasecmp(fqdn, host))) {
  69                         found = hostalias_masq;
  70                 }
  71
  72                 if ( (!strcasecmp(type, "localhost")) && (!strcasecmp(fqdn, host))) {
  73                         found = hostalias_localhost;
  74                 }
  75
  76                 // "directory" used to be a distributed version of "localhost" but they're both the same now
  77                 if ( (!strcasecmp(type, "directory")) && (!strcasecmp(fqdn, host))) {
  78                         found = hostalias_localhost;
  79                 }
  80
  81                 if (found) return(found);
  82         }
  83         return(hostalias_nomatch);
  84 }
  85
  86
  87 // Determine whether a given Internet address belongs to the current user
  88 int CtdlIsMe(char *addr, int addr_buf_len) {
  89         struct recptypes *recp;
  90         int i;
  91
  92         recp = validate_recipients(addr, NULL, 0);
  93         if (recp == NULL) return(0);
  94
  95         if (recp->num_local == 0) {
  96                 free_recipients(recp);
  97                 return(0);
  98         }
  99
 100         for (i=0; i<recp->num_local; ++i) {
 101                 extract_token(addr, recp->recp_local, i, '|', addr_buf_len);
 102                 if (!strcasecmp(addr, CC->user.fullname)) {
 103                         free_recipients(recp);
 104                         return(1);
 105                 }
 106         }
 107
 108         free_recipients(recp);
 109         return(0);
 110 }
 111
 112
 113 // If the last item in a list of recipients was truncated to a partial address,
 114 // remove it completely in order to avoid choking library functions.
 115 void sanitize_truncated_recipient(char *str) {
 116         if (!str) return;
 117         if (num_tokens(str, ',') < 2) return;
 118
 119         int len = strlen(str);
 120         if (len < 900) return;
 121         if (len > 998) str[998] = 0;
 122
 123         char *cptr = strrchr(str, ',');
 124         if (!cptr) return;
 125
 126         char *lptr = strchr(cptr, '<');
 127         char *rptr = strchr(cptr, '>');
 128
 129         if ( (lptr) && (rptr) && (rptr > lptr) ) return;
 130
 131         *cptr = 0;
 132 }
 133
 134
 135 // This function is self explanatory.
 136 // (What can I say, I'm in a weird mood today...)
 137 void remove_any_whitespace_to_the_left_or_right_of_at_symbol(char *name) {
 138         char *ptr;
 139         if (!name) return;
 140
 141         for (ptr=name; *ptr; ++ptr) {
 142                 while ( (isspace(*ptr)) && (*(ptr+1)=='@') ) {
 143                         strcpy(ptr, ptr+1);
 144                         if (ptr > name) --ptr;
 145                 }
 146                 while ( (*ptr=='@') && (*(ptr+1)!=0) && (isspace(*(ptr+1))) ) {
 147                         strcpy(ptr+1, ptr+2);
 148                 }
 149         }
 150 }
 151
 152
 153 // values that can be returned by expand_aliases()
 154 enum {
 155         EA_ERROR,               // Can't send message due to bad address
 156         EA_MULTIPLE,            // Alias expanded into multiple recipients -- run me again!
 157         EA_LOCAL,               // Local message, do no network processing
 158         EA_INTERNET,            // Convert msg and send as Internet mail
 159         EA_SKIP                 // This recipient has been invalidated -- skip it!
 160 };
 161
 162
 163 // Process alias and routing info for email addresses
 164 int expand_aliases(char *name, char *aliases) {
 165         int a;
 166         char aaa[SIZ];
 167         int at = 0;
 168
 169         if (aliases) {
 170                 int num_aliases = num_tokens(aliases, '\n');
 171                 for (a=0; a<num_aliases; ++a) {
 172                         extract_token(aaa, aliases, a, '\n', sizeof aaa);
 173                         char *bar = strchr(aaa, '|');
 174                         if (bar) {
 175                                 bar[0] = 0;
 176                                 ++bar;
 177                                 string_trim(aaa);
 178                                 string_trim(bar);
 179                                 if ( (!IsEmptyStr(aaa)) && (!strcasecmp(name, aaa)) ) {
 180                                         syslog(LOG_DEBUG, "internet_addressing: global alias <%s> to <%s>", name, bar);
 181                                         strcpy(name, bar);
 182                                 }
 183                         }
 184                 }
 185                 if (strchr(name, ',')) {
 186                         return(EA_MULTIPLE);
 187                 }
 188         }
 189
 190         char original_name[256];                                // Now go for the regular aliases
 191         safestrncpy(original_name, name, sizeof original_name);
 192
 193         // should these checks still be here, or maybe move them to split_recps() ?
 194         string_trim(name);
 195         remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
 196         stripallbut(name, '<', '>');
 197
 198         // Hit the email address directory
 199         if (CtdlDirectoryLookup(aaa, name, sizeof aaa) == 0) {
 200                 strcpy(name, aaa);
 201         }
 202
 203         if (strcasecmp(original_name, name)) {
 204                 syslog(LOG_INFO, "internet_addressing: directory alias <%s> to <%s>", original_name, name);
 205         }
 206
 207         // Change "user @ xxx" to "user" if xxx is an alias for this host
 208         for (a=0; name[a] != '\0'; ++a) {
 209                 if (name[a] == '@') {
 210                         if (CtdlHostAlias(&name[a+1]) == hostalias_localhost) {
 211                                 name[a] = 0;
 212                                 syslog(LOG_DEBUG, "internet_addressing: host is local, recipient is <%s>", name);
 213                                 break;
 214                         }
 215                 }
 216         }
 217
 218         // Is this a local or remote recipient?
 219         at = haschar(name, '@');
 220         if (at == 0) {
 221                 return(EA_LOCAL);                       // no @'s = local address
 222         }
 223         else if (at == 1) {
 224                 return(EA_INTERNET);                    // one @ = internet address
 225         }
 226         else {
 227                 return(EA_ERROR);                       // more than one @ = badly formed address
 228         }
 229 }
 230
 231
 232 // Return a supplied list of email addresses as an array, removing superfluous information and syntax.
 233 // If an existing Array is supplied as "append_to" it will do so; otherwise a new Array is allocated.
 234 Array *split_recps(char *addresses, Array *append_to) {
 235
 236         if (IsEmptyStr(addresses)) {            // nothing supplied, nothing returned
 237                 return(NULL);
 238         }
 239
 240         // Copy the supplied address list into our own memory space, because we are going to modify it.
 241         char *a = strdup(addresses);
 242         if (a == NULL) {
 243                 syslog(LOG_ERR, "internet_addressing: malloc() failed: %m");
 244                 return(NULL);
 245         }
 246
 247         // Strip out anything in double quotes
 248         char *l = NULL;
 249         char *r = NULL;
 250         do {
 251                 l = strchr(a, '\"');
 252                 r = strrchr(a, '\"');
 253                 if (r > l) {
 254                         strcpy(l, r+1);
 255                 }
 256         } while (r > l);
 257
 258         // Transform all qualifying delimiters to commas
 259         char *t;
 260         for (t=a; t[0]; ++t) {
 261                 if ((t[0]==';') || (t[0]=='|')) {
 262                         t[0]=',';
 263                 }
 264         }
 265
 266         // Tokenize the recipients into an array.  No single recipient should be larger than 256 bytes.
 267         Array *recipients_array = NULL;
 268         if (append_to) {
 269                 recipients_array = append_to;                   // Append to an existing array of recipients
 270         }
 271         else {
 272                 recipients_array = array_new(256);              // This is a new array of recipients
 273         }
 274
 275         int num_addresses = num_tokens(a, ',');
 276         int i;
 277         for (i=0; i<num_addresses; ++i) {
 278                 char this_address[256];
 279                 extract_token(this_address, a, i, ',', sizeof this_address);
 280                 string_trim(this_address);                              // strip leading and trailing whitespace
 281                 stripout(this_address, '(', ')');               // remove any portion in parentheses
 282                 stripallbut(this_address, '<', '>');            // if angle brackets are present, keep only what is inside them
 283                 if (!IsEmptyStr(this_address)) {
 284                         array_append(recipients_array, this_address);
 285                 }
 286         }
 287
 288         free(a);                                                // We don't need this buffer anymore.
 289         return(recipients_array);                               // Return the completed array to the caller.
 290 }
 291
 292
 293 // Validate recipients, count delivery types and errors, and handle aliasing
 294 //
 295 // Returns 0 if all addresses are ok, ret->num_error = -1 if no addresses
 296 // were specified, or the number of addresses found invalid.
 297 //
 298 // Caller needs to free the result using free_recipients()
 299 //
 300 struct recptypes *validate_recipients(char *supplied_recipients, const char *RemoteIdentifier, int Flags) {
 301         struct recptypes *ret;
 302         char *recipients = NULL;
 303         char append[SIZ];
 304         long len;
 305         int mailtype;
 306         int invalid;
 307         struct ctdluser tempUS;
 308         struct ctdlroom original_room;
 309         int err = 0;
 310         char errmsg[SIZ];
 311         char *org_recp;
 312         char this_recp[256];
 313
 314         ret = (struct recptypes *) malloc(sizeof(struct recptypes));                    // Initialize
 315         if (ret == NULL) return(NULL);
 316         memset(ret, 0, sizeof(struct recptypes));                                       // set all values to null/zero
 317
 318         if (supplied_recipients == NULL) {
 319                 recipients = strdup("");
 320         }
 321         else {
 322                 recipients = strdup(supplied_recipients);
 323         }
 324
 325         len = strlen(recipients) + 1024;                                                // allocate memory
 326         ret->errormsg = malloc(len);
 327         ret->recp_local = malloc(len);
 328         ret->recp_internet = malloc(len);
 329         ret->recp_room = malloc(len);
 330         ret->display_recp = malloc(len);
 331         ret->recp_orgroom = malloc(len);
 332
 333         ret->errormsg[0] = 0;
 334         ret->recp_local[0] = 0;
 335         ret->recp_internet[0] = 0;
 336         ret->recp_room[0] = 0;
 337         ret->recp_orgroom[0] = 0;
 338         ret->display_recp[0] = 0;
 339         ret->recptypes_magic = RECPTYPES_MAGIC;
 340
 341         Array *recp_array = split_recps(supplied_recipients, NULL);
 342
 343         char *aliases = CtdlGetSysConfig(GLOBAL_ALIASES);                               // First hit the Global Alias Table
 344
 345         int r;
 346         for (r=0; (recp_array && r<array_len(recp_array)); ++r) {
 347                 org_recp = (char *)array_get_element_at(recp_array, r);
 348                 strncpy(this_recp, org_recp, sizeof this_recp);
 349
 350                 int i;
 351                 for (i=0; i<3; ++i) {                                           // pass three times through the aliaser
 352                         mailtype = expand_aliases(this_recp, aliases);
 353
 354                         // If an alias expanded to multiple recipients, strip off those recipients and append them
 355                         // to the end of the array.  This loop will hit those again when it gets there.
 356                         if (mailtype == EA_MULTIPLE) {
 357                                 recp_array = split_recps(this_recp, recp_array);
 358                         }
 359                 }
 360
 361                 // This loop searches for duplicate recipients in the final list and marks them to be skipped.
 362                 int j;
 363                 for (j=0; j<r; ++j) {
 364                         if (!strcasecmp(this_recp, (char *)array_get_element_at(recp_array, j) )) {
 365                                 mailtype = EA_SKIP;
 366                         }
 367                 }
 368
 369                 syslog(LOG_DEBUG, "Recipient #%d of type %d is <%s>", r, mailtype, this_recp);
 370                 invalid = 0;
 371                 errmsg[0] = 0;
 372                 switch(mailtype) {
 373                 case EA_LOCAL:                                  // There are several types of "local" recipients.
 374
 375                         // Old BBS conventions require mail to "sysop" to go somewhere.  Send it to the admin room.
 376                         if (!strcasecmp(this_recp, "sysop")) {
 377                                 ++ret->num_room;
 378                                 strcpy(this_recp, CtdlGetConfigStr("c_aideroom"));
 379                                 if (!IsEmptyStr(ret->recp_room)) {
 380                                         strcat(ret->recp_room, "|");
 381                                 }
 382                                 strcat(ret->recp_room, this_recp);
 383                         }
 384
 385                         // This handles rooms which can receive posts via email.
 386                         else if (!strncasecmp(this_recp, "room_", 5)) {
 387                                 original_room = CC->room;                               // Remember where we parked
 388
 389                                 char mail_to_room[ROOMNAMELEN];
 390                                 char *m;
 391                                 strncpy(mail_to_room, &this_recp[5], sizeof mail_to_room);
 392                                 for (m = mail_to_room; *m; ++m) {
 393                                         if (m[0] == '_') m[0]=' ';
 394                                 }
 395                                 if (!CtdlGetRoom(&CC->room, mail_to_room)) {            // Find the room they asked for
 396
 397                                         err = CtdlDoIHavePermissionToPostInThisRoom(    // check for write permissions to room
 398                                                 errmsg,
 399                                                 sizeof errmsg,
 400                                                 Flags,
 401                                                 0                                       // 0 means "this is not a reply"
 402                                         );
 403                                         if (err) {
 404                                                 ++ret->num_error;
 405                                                 invalid = 1;
 406                                         }
 407                                         else {
 408                                                 ++ret->num_room;
 409                                                 if (!IsEmptyStr(ret->recp_room)) {
 410                                                         strcat(ret->recp_room, "|");
 411                                                 }
 412                                                 strcat(ret->recp_room, CC->room.QRname);
 413
 414                                                 if (!IsEmptyStr(ret->recp_orgroom)) {
 415                                                         strcat(ret->recp_orgroom, "|");
 416                                                 }
 417                                                 strcat(ret->recp_orgroom, this_recp);
 418
 419                                         }
 420                                 }
 421                                 else {                                                  // no such room exists
 422                                         ++ret->num_error;
 423                                         invalid = 1;
 424                                 }
 425
 426                                 // Restore this session's original room location.
 427                                 CC->room = original_room;
 428
 429                         }
 430
 431                         // This handles the most common case, which is mail to a user's inbox.
 432                         // (the next line depends on left-to-right evaluation)
 433                         else if ((CtdlGetUser(&tempUS, this_recp) == 0) && (tempUS.usernum > 0)) {
 434                                 ++ret->num_local;
 435                                 strcpy(this_recp, tempUS.fullname);
 436                                 if (!IsEmptyStr(ret->recp_local)) {
 437                                         strcat(ret->recp_local, "|");
 438                                 }
 439                                 strcat(ret->recp_local, this_recp);
 440                         }
 441
 442                         // No match for this recipient
 443                         else {
 444                                 ++ret->num_error;
 445                                 invalid = 1;
 446                         }
 447                         break;
 448                 case EA_INTERNET:
 449                         // Yes, you're reading this correctly: if the target domain points back to the local system,
 450                         // the address is invalid.  That's because if the address were valid, we would have
 451                         // already translated it to a local address by now.
 452                         if (IsDirectory(this_recp, 0)) {
 453                                 ++ret->num_error;
 454                                 invalid = 1;
 455                         }
 456                         else {
 457                                 ++ret->num_internet;
 458                                 if (!IsEmptyStr(ret->recp_internet)) {
 459                                         strcat(ret->recp_internet, "|");
 460                                 }
 461                                 strcat(ret->recp_internet, this_recp);
 462                         }
 463                         break;
 464                 case EA_MULTIPLE:
 465                 case EA_SKIP:
 466                         // no action required, anything in this slot has already been processed elsewhere
 467                         break;
 468                 case EA_ERROR:
 469                         ++ret->num_error;
 470                         invalid = 1;
 471                         break;
 472                 }
 473                 if (invalid) {
 474                         if (IsEmptyStr(errmsg)) {
 475                                 snprintf(append, sizeof append, "Invalid recipient: %s", this_recp);
 476                         }
 477                         else {
 478                                 snprintf(append, sizeof append, "%s", errmsg);
 479                         }
 480                         if ( (strlen(ret->errormsg) + strlen(append) + 3) < SIZ) {
 481                                 if (!IsEmptyStr(ret->errormsg)) {
 482                                         strcat(ret->errormsg, "; ");
 483                                 }
 484                                 strcat(ret->errormsg, append);
 485                         }
 486                 }
 487                 else {
 488                         if (IsEmptyStr(ret->display_recp)) {
 489                                 strcpy(append, this_recp);
 490                         }
 491                         else {
 492                                 snprintf(append, sizeof append, ", %s", this_recp);
 493                         }
 494                         if ( (strlen(ret->display_recp)+strlen(append)) < SIZ) {
 495                                 strcat(ret->display_recp, append);
 496                         }
 497                 }
 498         }
 499
 500         if (aliases != NULL) {          // ok, we're done with the global alias list now
 501                 free(aliases);
 502         }
 503
 504         if ( (ret->num_local + ret->num_internet + ret->num_room + ret->num_error) == 0) {
 505                 ret->num_error = (-1);
 506                 strcpy(ret->errormsg, "No recipients specified.");
 507         }
 508
 509         syslog(LOG_DEBUG, "internet_addressing: validate_recipients() = %d local, %d room, %d SMTP, %d error",
 510                 ret->num_local, ret->num_room, ret->num_internet, ret->num_error
 511         );
 512
 513         free(recipients);
 514         if (recp_array) {
 515                 array_free(recp_array);
 516         }
 517
 518         return(ret);
 519 }
 520
 521
 522 // Destructor for recptypes
 523 void free_recipients(struct recptypes *valid) {
 524
 525         if (valid == NULL) {
 526                 return;
 527         }
 528
 529         if (valid->recptypes_magic != RECPTYPES_MAGIC) {
 530                 syslog(LOG_ERR, "internet_addressing: attempt to call free_recipients() on some other data type!");
 531                 exit(CTDLEXIT_BAD_MAGIC);
 532         }
 533
 534         if (valid->errormsg != NULL)            free(valid->errormsg);
 535         if (valid->recp_local != NULL)          free(valid->recp_local);
 536         if (valid->recp_internet != NULL)       free(valid->recp_internet);
 537         if (valid->recp_room != NULL)           free(valid->recp_room);
 538         if (valid->recp_orgroom != NULL)        free(valid->recp_orgroom);
 539         if (valid->display_recp != NULL)        free(valid->display_recp);
 540         if (valid->bounce_to != NULL)           free(valid->bounce_to);
 541         if (valid->envelope_from != NULL)       free(valid->envelope_from);
 542         if (valid->sending_room != NULL)        free(valid->sending_room);
 543         free(valid);
 544 }
 545
 546
 547 char *qp_encode_email_addrs(char *source) {
 548         char *user, *node, *name;
 549         const char headerStr[] = "=?UTF-8?Q?";
 550         char *Encoded;
 551         char *EncodedName;
 552         char *nPtr;
 553         int need_to_encode = 0;
 554         long SourceLen;
 555         long EncodedMaxLen;
 556         long nColons = 0;
 557         long *AddrPtr;
 558         long *AddrUtf8;
 559         long nAddrPtrMax = 50;
 560         long nmax;
 561         int InQuotes = 0;
 562         int i, n;
 563
 564         if (source == NULL) return source;
 565         if (IsEmptyStr(source)) return source;
 566         syslog(LOG_DEBUG, "internet_addressing: qp_encode_email_addrs <%s>", source);
 567
 568         AddrPtr = malloc (sizeof (long) * nAddrPtrMax);
 569         AddrUtf8 = malloc (sizeof (long) * nAddrPtrMax);
 570         memset(AddrUtf8, 0, sizeof (long) * nAddrPtrMax);
 571         *AddrPtr = 0;
 572         i = 0;
 573         while (!IsEmptyStr (&source[i])) {
 574                 if (nColons >= nAddrPtrMax){
 575                         long *ptr;
 576
 577                         ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
 578                         memcpy (ptr, AddrPtr, sizeof (long) * nAddrPtrMax);
 579                         free (AddrPtr), AddrPtr = ptr;
 580
 581                         ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
 582                         memset(&ptr[nAddrPtrMax], 0, sizeof (long) * nAddrPtrMax);
 583
 584                         memcpy (ptr, AddrUtf8, sizeof (long) * nAddrPtrMax);
 585                         free (AddrUtf8), AddrUtf8 = ptr;
 586                         nAddrPtrMax *= 2;
 587                 }
 588                 if (((unsigned char) source[i] < 32) || ((unsigned char) source[i] > 126)) {
 589                         need_to_encode = 1;
 590                         AddrUtf8[nColons] = 1;
 591                 }
 592                 if (source[i] == '"') {
 593                         InQuotes = !InQuotes;
 594                 }
 595                 if (!InQuotes && source[i] == ',') {
 596                         AddrPtr[nColons] = i;
 597                         nColons++;
 598                 }
 599                 i++;
 600         }
 601         if (need_to_encode == 0) {
 602                 free(AddrPtr);
 603                 free(AddrUtf8);
 604                 return source;
 605         }
 606
 607         SourceLen = i;
 608         EncodedMaxLen = nColons * (sizeof(headerStr) + 3) + SourceLen * 3;
 609         Encoded = (char*) malloc (EncodedMaxLen);
 610
 611         for (i = 0; i < nColons; i++) {
 612                 source[AddrPtr[i]++] = '\0';
 613         }
 614         // TODO: if libidn, this might get larger
 615         user = malloc(SourceLen + 1);
 616         node = malloc(SourceLen + 1);
 617         name = malloc(SourceLen + 1);
 618
 619         nPtr = Encoded;
 620         *nPtr = '\0';
 621         for (i = 0; i < nColons && nPtr != NULL; i++) {
 622                 nmax = EncodedMaxLen - (nPtr - Encoded);
 623                 if (AddrUtf8[i]) {
 624                         process_rfc822_addr(&source[AddrPtr[i]], user, node, name);
 625                         // TODO: libIDN here !
 626                         if (IsEmptyStr(name)) {
 627                                 n = snprintf(nPtr, nmax, (i==0)?"%s@%s" : ",%s@%s", user, node);
 628                         }
 629                         else {
 630                                 EncodedName = rfc2047encode(name, strlen(name));
 631                                 n = snprintf(nPtr, nmax, (i==0)?"%s <%s@%s>" : ",%s <%s@%s>", EncodedName, user, node);
 632                                 free(EncodedName);
 633                         }
 634                 }
 635                 else {
 636                         n = snprintf(nPtr, nmax, (i==0)?"%s" : ",%s", &source[AddrPtr[i]]);
 637                 }
 638                 if (n > 0 )
 639                         nPtr += n;
 640                 else {
 641                         char *ptr, *nnPtr;
 642                         ptr = (char*) malloc(EncodedMaxLen * 2);
 643                         memcpy(ptr, Encoded, EncodedMaxLen);
 644                         nnPtr = ptr + (nPtr - Encoded), nPtr = nnPtr;
 645                         free(Encoded), Encoded = ptr;
 646                         EncodedMaxLen *= 2;
 647                         i--; // do it once more with properly lengthened buffer
 648                 }
 649         }
 650         for (i = 0; i < nColons; i++)
 651                 source[--AddrPtr[i]] = ',';
 652
 653         free(user);
 654         free(node);
 655         free(name);
 656         free(AddrUtf8);
 657         free(AddrPtr);
 658         return Encoded;
 659 }
 660
 661
 662 // Unfold a multi-line field into a single line, removing multi-whitespaces
 663 void unfold_rfc822_field(char **field, char **FieldEnd)
 664 {
 665         int quote = 0;
 666         char *pField = *field;
 667         char *sField;
 668         char *pFieldEnd = *FieldEnd;
 669
 670         while (isspace(*pField))
 671                 pField++;
 672         // remove leading/trailing whitespace
 673         ;
 674
 675         while (isspace(*pFieldEnd))
 676                 pFieldEnd --;
 677
 678         *FieldEnd = pFieldEnd;
 679         // convert non-space whitespace to spaces, and remove double blanks
 680         for (sField = *field = pField;
 681              sField < pFieldEnd;
 682              pField++, sField++)
 683         {
 684                 if ((*sField=='\r') || (*sField=='\n'))
 685                 {
 686                         int offset = 1;
 687                         while ( ( (*(sField + offset) == '\r') || (*(sField + offset) == '\n' )) && (sField + offset < pFieldEnd) ) {
 688                                 offset ++;
 689                         }
 690                         sField += offset;
 691                         *pField = *sField;
 692                 }
 693                 else {
 694                         if (*sField=='\"') quote = 1 - quote;
 695                         if (!quote) {
 696                                 if (isspace(*sField)) {
 697                                         *pField = ' ';
 698                                         pField++;
 699                                         sField++;
 700
 701                                         while ((sField < pFieldEnd) &&
 702                                                isspace(*sField))
 703                                                 sField++;
 704                                         *pField = *sField;
 705                                 }
 706                                 else *pField = *sField;
 707                         }
 708                         else *pField = *sField;
 709                 }
 710         }
 711         *pField = '\0';
 712         *FieldEnd = pField - 1;
 713 }
 714
 715
 716 // Split an RFC822-style address into userid, host, and full name
 717 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name) {
 718         int a;
 719
 720         strcpy(user, "");
 721         strcpy(node, CtdlGetConfigStr("c_fqdn"));
 722         strcpy(name, "");
 723
 724         if (rfc822 == NULL) return;
 725
 726         // extract full name - first, it's From minus <userid>
 727         strcpy(name, rfc822);
 728         stripout(name, '<', '>');
 729
 730         // and anything to the right of a @
 731         for (a = 0; name[a] != '\0'; ++a) {
 732                 if (name[a] == '@') {
 733                         name[a] = 0;
 734                         break;
 735                 }
 736         }
 737
 738         // but if there are parentheses, that changes the rules...
 739         if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
 740                 strcpy(name, rfc822);
 741                 stripallbut(name, '(', ')');
 742         }
 743
 744         // but if there are a set of quotes, that supersedes everything
 745         if (haschar(rfc822, 34) == 2) {
 746                 strcpy(name, rfc822);
 747                 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
 748                         strcpy(&name[0], &name[1]);
 749                 }
 750                 strcpy(&name[0], &name[1]);
 751                 for (a = 0; name[a] != '\0'; ++a)
 752                         if (name[a] == 34) {
 753                                 name[a] = 0;
 754                                 break;
 755                         }
 756         }
 757         // extract user id
 758         strcpy(user, rfc822);
 759
 760         // first get rid of anything in parens
 761         stripout(user, '(', ')');
 762
 763         // if there's a set of angle brackets, strip it down to that
 764         if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
 765                 stripallbut(user, '<', '>');
 766         }
 767
 768         // and anything to the right of a @
 769         for (a = 0; user[a] != '\0'; ++a) {
 770                 if (user[a] == '@') {
 771                         user[a] = 0;
 772                         break;
 773                 }
 774         }
 775
 776         // extract node name
 777         strcpy(node, rfc822);
 778
 779         // first get rid of anything in parens
 780         stripout(node, '(', ')');
 781
 782         // if there's a set of angle brackets, strip it down to that
 783         if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
 784                 stripallbut(node, '<', '>');
 785         }
 786
 787         // If no node specified, tack ours on instead
 788         if (haschar(node, '@') == 0) {
 789                 strcpy(node, CtdlGetConfigStr("c_nodename"));
 790         }
 791         else {
 792                 // strip anything to the left of a @
 793                 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0)) {
 794                         strcpy(node, &node[1]);
 795                 }
 796         }
 797
 798         // strip leading and trailing spaces in all strings
 799         string_trim(user);
 800         string_trim(node);
 801         string_trim(name);
 802
 803         // If we processed a string that had the address in angle brackets
 804         // but no name outside the brackets, we now have an empty name.  In
 805         // this case, use the user portion of the address as the name.
 806         if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
 807                 strcpy(name, user);
 808         }
 809 }
 810
 811
 812 // convert_field() is a helper function for convert_internet_message().
 813 // Given start/end positions for an rfc822 field, it converts it to a Citadel
 814 // field if it wants to, and unfolds it if necessary.
 815 //
 816 // Returns 1 if the field was converted and inserted into the Citadel message
 817 // structure, implying that the source field should be removed from the
 818 // message text.
 819 int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
 820         char *key, *value, *valueend;
 821         long len;
 822         const char *pos;
 823         int i;
 824         const char *colonpos = NULL;
 825         int processed = 0;
 826         char user[1024];
 827         char node[1024];
 828         char name[1024];
 829         char addr[1024];
 830         time_t parsed_date;
 831         long valuelen;
 832
 833         for (pos = end; pos >= beg; pos--) {
 834                 if (*pos == ':') colonpos = pos;
 835         }
 836
 837         if (colonpos == NULL) return(0);        /* no colon? not a valid header line */
 838
 839         len = end - beg;
 840         key = malloc(len + 2);
 841         memcpy(key, beg, len + 1);
 842         key[len] = '\0';
 843         valueend = key + len;
 844         * ( key + (colonpos - beg) ) = '\0';
 845         value = &key[(colonpos - beg) + 1];
 846         // printf("Header: [%s]\nValue: [%s]\n", key, value);
 847         unfold_rfc822_field(&value, &valueend);
 848         valuelen = valueend - value + 1;
 849         // printf("UnfoldedValue: [%s]\n", value);
 850
 851         // Here's the big rfc822-to-citadel loop.
 852
 853         // Date/time is converted into a unix timestamp.  If the conversion
 854         // fails, we replace it with the time the message arrived locally.
 855         if (!strcasecmp(key, "Date")) {
 856                 parsed_date = parsedate(value);
 857                 if (parsed_date < 0L) parsed_date = time(NULL);
 858
 859                 if (CM_IsEmpty(msg, eTimestamp))
 860                         CM_SetFieldLONG(msg, eTimestamp, parsed_date);
 861                 processed = 1;
 862         }
 863
 864         else if (!strcasecmp(key, "From")) {
 865                 process_rfc822_addr(value, user, node, name);
 866                 syslog(LOG_DEBUG, "internet_addressing: converted to <%s@%s> (%s)", user, node, name);
 867                 snprintf(addr, sizeof(addr), "%s@%s", user, node);
 868                 if (CM_IsEmpty(msg, eAuthor) && !IsEmptyStr(name)) {
 869                         CM_SetField(msg, eAuthor, name);
 870                 }
 871                 if (CM_IsEmpty(msg, erFc822Addr) && !IsEmptyStr(addr)) {
 872                         CM_SetField(msg, erFc822Addr, addr);
 873                 }
 874                 processed = 1;
 875         }
 876
 877         else if (!strcasecmp(key, "Subject")) {
 878                 if (CM_IsEmpty(msg, eMsgSubject))
 879                         CM_SetField(msg, eMsgSubject, value);
 880                 processed = 1;
 881         }
 882
 883         else if (!strcasecmp(key, "List-ID")) {
 884                 if (CM_IsEmpty(msg, eListID))
 885                         CM_SetField(msg, eListID, value);
 886                 processed = 1;
 887         }
 888
 889         else if (!strcasecmp(key, "To")) {
 890                 if (CM_IsEmpty(msg, eRecipient))
 891                         CM_SetField(msg, eRecipient, value);
 892                 processed = 1;
 893         }
 894
 895         else if (!strcasecmp(key, "CC")) {
 896                 if (CM_IsEmpty(msg, eCarbonCopY))
 897                         CM_SetField(msg, eCarbonCopY, value);
 898                 processed = 1;
 899         }
 900
 901         else if (!strcasecmp(key, "Message-ID")) {
 902                 if (!CM_IsEmpty(msg, emessageId)) {
 903                         syslog(LOG_WARNING, "internet_addressing: duplicate message id");
 904                 }
 905                 else {
 906                         char *pValue;
 907                         long pValueLen;
 908
 909                         pValue = value;
 910                         pValueLen = valuelen;
 911                         // Strip angle brackets
 912                         while (haschar(pValue, '<') > 0) {
 913                                 pValue ++;
 914                                 pValueLen --;
 915                         }
 916
 917                         for (i = 0; i <= pValueLen; ++i)
 918                                 if (pValue[i] == '>') {
 919                                         pValueLen = i;
 920                                         break;
 921                                 }
 922
 923                         CM_SetField(msg, emessageId, pValue);
 924                 }
 925
 926                 processed = 1;
 927         }
 928
 929         else if (!strcasecmp(key, "Return-Path")) {
 930                 if (CM_IsEmpty(msg, eMessagePath))
 931                         CM_SetField(msg, eMessagePath, value);
 932                 processed = 1;
 933         }
 934
 935         else if (!strcasecmp(key, "Envelope-To")) {
 936                 if (CM_IsEmpty(msg, eenVelopeTo))
 937                         CM_SetField(msg, eenVelopeTo, value);
 938                 processed = 1;
 939         }
 940
 941         else if (!strcasecmp(key, "References")) {
 942                 CM_SetField(msg, eWeferences, value);
 943                 processed = 1;
 944         }
 945
 946         else if (!strcasecmp(key, "Reply-To")) {
 947                 CM_SetField(msg, eReplyTo, value);
 948                 processed = 1;
 949         }
 950
 951         else if (!strcasecmp(key, "In-reply-to")) {
 952                 if (CM_IsEmpty(msg, eWeferences)) // References: supersedes In-reply-to:
 953                         CM_SetField(msg, eWeferences, value);
 954                 processed = 1;
 955         }
 956
 957
 958
 959         // Clean up and move on.
 960         free(key);      // Don't free 'value', it's actually the same buffer
 961         return processed;
 962 }
 963
 964
 965 // Convert RFC822 references format (References) to Citadel references format (Weferences)
 966 void convert_references_to_wefewences(char *str) {
 967         int bracket_nesting = 0;
 968         char *ptr = str;
 969         char *moveptr = NULL;
 970         char ch;
 971
 972         while(*ptr) {
 973                 ch = *ptr;
 974                 if (ch == '>') {
 975                         --bracket_nesting;
 976                         if (bracket_nesting < 0) bracket_nesting = 0;
 977                 }
 978                 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
 979                         *ptr = '|';
 980                         ++ptr;
 981                 }
 982                 else if (bracket_nesting > 0) {
 983                         ++ptr;
 984                 }
 985                 else {
 986                         moveptr = ptr;
 987                         while (*moveptr) {
 988                                 *moveptr = *(moveptr+1);
 989                                 ++moveptr;
 990                         }
 991                 }
 992                 if (ch == '<') ++bracket_nesting;
 993         }
 994
 995 }
 996
 997
 998 // Convert an RFC822 message (headers + body) to a CtdlMessage structure.
 999 // NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
1000 // will be deallocated when CM_Free() is called.  Therefore, the
1001 // supplied buffer should be DEREFERENCED.  It should not be freed or used
1002 // again.
1003 struct CtdlMessage *convert_internet_message(char *rfc822) {
1004         StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
1005         free (rfc822);
1006         return convert_internet_message_buf(&RFCBuf);
1007 }
1008
1009
1010 struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822) {
1011         struct CtdlMessage *msg;
1012         const char *pos, *beg, *end, *totalend;
1013         int done, alldone = 0;
1014         int converted;
1015         StrBuf *OtherHeaders;
1016
1017         msg = malloc(sizeof(struct CtdlMessage));
1018         if (msg == NULL) return msg;
1019
1020         memset(msg, 0, sizeof(struct CtdlMessage));
1021         msg->cm_magic = CTDLMESSAGE_MAGIC;      // self check
1022         msg->cm_anon_type = 0;                  // never anonymous
1023         msg->cm_format_type = FMT_RFC822;       // internet message
1024
1025         pos = ChrPtr(*rfc822);
1026         totalend = pos + StrLength(*rfc822);
1027         done = 0;
1028         OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
1029
1030         while (!alldone) {
1031
1032                 /* Locate beginning and end of field, keeping in mind that
1033                  * some fields might be multiline
1034                  */
1035                 end = beg = pos;
1036
1037                 while ((end < totalend) && (end == beg) && (done == 0) ) {
1038
1039                         if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) ) {
1040                                 end = pos;
1041                         }
1042
1043                         /* done with headers? */
1044                         if ((*pos=='\n') && ( (*(pos+1)=='\n') || (*(pos+1)=='\r')) ) {
1045                                 alldone = 1;
1046                         }
1047
1048                         if (pos >= (totalend - 1) ) {
1049                                 end = pos;
1050                                 done = 1;
1051                         }
1052
1053                         ++pos;
1054
1055                 }
1056
1057                 /* At this point we have a field.  Are we interested in it? */
1058                 converted = convert_field(msg, beg, end);
1059
1060                 /* Strip the field out of the RFC822 header if we used it */
1061                 if (!converted) {
1062                         StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
1063                         StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1064                 }
1065
1066                 /* If we've hit the end of the message, bail out */
1067                 if (pos >= totalend)
1068                         alldone = 1;
1069         }
1070         StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1071         if (pos < totalend)
1072                 StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
1073         FreeStrBuf(rfc822);
1074         CM_SetAsFieldSB(msg, eMesageText, &OtherHeaders);
1075
1076         /* Follow-up sanity checks... */
1077
1078         /* If there's no timestamp on this message, set it to now. */
1079         if (CM_IsEmpty(msg, eTimestamp)) {
1080                 CM_SetFieldLONG(msg, eTimestamp, time(NULL));
1081         }
1082
1083         /* If a W (references, or rather, Wefewences) field is present, we
1084          * have to convert it from RFC822 format to Citadel format.
1085          */
1086         if (!CM_IsEmpty(msg, eWeferences)) {
1087                 /// todo: API!
1088                 convert_references_to_wefewences(msg->cm_fields[eWeferences]);
1089         }
1090
1091         return msg;
1092 }
1093
1094
1095 /*
1096  * Look for a particular header field in an RFC822 message text.  If the
1097  * requested field is found, it is unfolded (if necessary) and returned to
1098  * the caller.  The field name is stripped out, leaving only its contents.
1099  * The caller is responsible for freeing the returned buffer.  If the requested
1100  * field is not present, or anything else goes wrong, it returns NULL.
1101  */
1102 char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
1103         char *fieldbuf = NULL;
1104         const char *end_of_headers;
1105         const char *field_start;
1106         const char *ptr;
1107         char *cont;
1108         char fieldhdr[SIZ];
1109
1110         /* Should never happen, but sometimes we get stupid */
1111         if (rfc822 == NULL) return(NULL);
1112         if (fieldname == NULL) return(NULL);
1113
1114         snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
1115
1116         /* Locate the end of the headers, so we don't run past that point */
1117         end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
1118         if (end_of_headers == NULL) {
1119                 end_of_headers = cbmstrcasestr(rfc822, "\n\n");
1120         }
1121         if (end_of_headers == NULL) return (NULL);
1122
1123         field_start = cbmstrcasestr(rfc822, fieldhdr);
1124         if (field_start == NULL) return(NULL);
1125         if (field_start > end_of_headers) return(NULL);
1126
1127         fieldbuf = malloc(SIZ);
1128         strcpy(fieldbuf, "");
1129
1130         ptr = field_start;
1131         ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
1132         while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
1133                 strcat(fieldbuf, " ");
1134                 cont = &fieldbuf[strlen(fieldbuf)];
1135                 ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
1136                 string_trim(cont);
1137         }
1138
1139         strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
1140         string_trim(fieldbuf);
1141
1142         return(fieldbuf);
1143 }
1144
1145
1146 /*****************************************************************************
1147  *                      DIRECTORY MANAGEMENT FUNCTIONS                       *
1148  *****************************************************************************/
1149
1150 /*
1151  * Generate the index key for an Internet e-mail address to be looked up
1152  * in the database.
1153  */
1154 void directory_key(char *key, char *addr) {
1155         int i;
1156         int keylen = 0;
1157
1158         for (i=0; !IsEmptyStr(&addr[i]); ++i) {
1159                 if (!isspace(addr[i])) {
1160                         key[keylen++] = tolower(addr[i]);
1161                 }
1162         }
1163         key[keylen++] = 0;
1164
1165         syslog(LOG_DEBUG, "internet_addressing: directory key is <%s>", key);
1166 }
1167
1168
1169 /*
1170  * Return nonzero if the supplied address is in one of "our" domains
1171  */
1172 int IsDirectory(char *addr, int allow_masq_domains) {
1173         char domain[256];
1174         int h;
1175
1176         extract_token(domain, addr, 1, '@', sizeof domain);
1177         string_trim(domain);
1178
1179         h = CtdlHostAlias(domain);
1180
1181         if ( (h == hostalias_masq) && allow_masq_domains)
1182                 return(1);
1183
1184         if (h == hostalias_localhost) {
1185                 return(1);
1186         }
1187         else {
1188                 return(0);
1189         }
1190 }
1191
1192
1193 /*
1194  * Add an Internet e-mail address to the directory for a user
1195  */
1196 int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
1197         char key[SIZ];
1198
1199         if (IsDirectory(internet_addr, 0) == 0) {
1200                 return 0;
1201         }
1202         syslog(LOG_DEBUG, "internet_addressing: create directory entry: %s --> %s", internet_addr, citadel_addr);
1203         directory_key(key, internet_addr);
1204         cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
1205         return 1;
1206 }
1207
1208
1209 /*
1210  * Delete an Internet e-mail address from the directory.
1211  *
1212  * (NOTE: we don't actually use or need the citadel_addr variable; it's merely
1213  * here because the callback API expects to be able to send it.)
1214  */
1215 int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
1216         char key[SIZ];
1217
1218         syslog(LOG_DEBUG, "internet_addressing: delete directory entry: %s --> %s", internet_addr, citadel_addr);
1219         directory_key(key, internet_addr);
1220         return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
1221 }
1222
1223
1224 /*
1225  * Look up an Internet e-mail address in the directory.
1226  * On success: returns 0, and Citadel address stored in 'target'
1227  * On failure: returns nonzero
1228  */
1229 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
1230         struct cdbdata cdbrec;
1231         char key[SIZ];
1232
1233         /* Dump it in there unchanged, just for kicks */
1234         if (target != NULL) {
1235                 safestrncpy(target, internet_addr, targbuflen);
1236         }
1237
1238         /* Only do lookups for addresses with hostnames in them */
1239         if (num_tokens(internet_addr, '@') != 2) return(-1);
1240
1241         /* Only do lookups for domains in the directory */
1242         if (IsDirectory(internet_addr, 0) == 0) return(-1);
1243
1244         directory_key(key, internet_addr);
1245         cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key));
1246         if (cdbrec.ptr != NULL) {
1247                 if (target != NULL) {
1248                         safestrncpy(target, cdbrec.ptr, targbuflen);
1249                 }
1250                 return(0);
1251         }
1252
1253         return(-1);
1254 }
1255
1256
1257 /*
1258  * Harvest any email addresses that someone might want to have in their
1259  * "collected addresses" book.
1260  */
1261 char *harvest_collected_addresses(struct CtdlMessage *msg) {
1262         char *coll = NULL;
1263         char addr[256];
1264         char user[256], node[256], name[256];
1265         int is_harvestable;
1266         int i, j, h;
1267         eMsgField field = 0;
1268
1269         if (msg == NULL) return(NULL);
1270
1271         is_harvestable = 1;
1272         strcpy(addr, "");
1273         if (!CM_IsEmpty(msg, eAuthor)) {
1274                 strcat(addr, msg->cm_fields[eAuthor]);
1275         }
1276         if (!CM_IsEmpty(msg, erFc822Addr)) {
1277                 strcat(addr, " <");
1278                 strcat(addr, msg->cm_fields[erFc822Addr]);
1279                 strcat(addr, ">");
1280                 if (IsDirectory(msg->cm_fields[erFc822Addr], 0)) {
1281                         is_harvestable = 0;
1282                 }
1283         }
1284
1285         if (is_harvestable) {
1286                 coll = strdup(addr);
1287         }
1288         else {
1289                 coll = strdup("");
1290         }
1291
1292         if (coll == NULL) return(NULL);
1293
1294         /* Scan both the R (To) and Y (CC) fields */
1295         for (i = 0; i < 2; ++i) {
1296                 if (i == 0) field = eRecipient;
1297                 if (i == 1) field = eCarbonCopY;
1298
1299                 if (!CM_IsEmpty(msg, field)) {
1300                         for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
1301                                 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
1302                                 if (strstr(addr, "=?") != NULL) {
1303                                         utf8ify_rfc822_string(addr);
1304                                 }
1305                                 process_rfc822_addr(addr, user, node, name);
1306                                 h = CtdlHostAlias(node);
1307                                 if (h != hostalias_localhost) {
1308                                         coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1309                                         if (coll == NULL) return(NULL);
1310                                         if (!IsEmptyStr(coll)) {
1311                                                 strcat(coll, ",");
1312                                         }
1313                                         string_trim(addr);
1314                                         strcat(coll, addr);
1315                                 }
1316                         }
1317                 }
1318         }
1319
1320         if (IsEmptyStr(coll)) {
1321                 free(coll);
1322                 return(NULL);
1323         }
1324         return(coll);
1325 }
1326
1327
1328 /*
1329  * Helper function for CtdlRebuildDirectoryIndex()
1330  */
1331 void CtdlRebuildDirectoryIndex_backend(char *username, void *data) {
1332
1333         int j = 0;
1334         struct ctdluser usbuf;
1335
1336         if (CtdlGetUser(&usbuf, username) != 0) {
1337                 return;
1338         }
1339
1340         if ( (!IsEmptyStr(usbuf.fullname)) && (!IsEmptyStr(usbuf.emailaddrs)) ) {
1341                 for (j=0; j<num_tokens(usbuf.emailaddrs, '|'); ++j) {
1342                         char one_email[512];
1343                         extract_token(one_email, usbuf.emailaddrs, j, '|', sizeof one_email);
1344                         CtdlDirectoryAddUser(one_email, usbuf.fullname);
1345                 }
1346         }
1347 }
1348
1349
1350 /*
1351  * Initialize the directory database (erasing anything already there)
1352  */
1353 void CtdlRebuildDirectoryIndex(void) {
1354         syslog(LOG_INFO, "internet_addressing: rebuilding email address directory index");
1355         cdb_trunc(CDB_DIRECTORY);
1356         ForEachUser(CtdlRebuildDirectoryIndex_backend, NULL);
1357 }
1358
1359
1360 // Configure Internet email addresses for a user account, updating the Directory Index in the process
1361 void CtdlSetEmailAddressesForUser(char *requested_user, char *new_emailaddrs) {
1362         struct ctdluser usbuf;
1363         int i;
1364         char buf[SIZ];
1365
1366         if (CtdlGetUserLock(&usbuf, requested_user) != 0) {     // We can lock because the DirectoryIndex functions don't lock.
1367                 return;                                         // Silently fail here if the specified user does not exist.
1368         }
1369
1370         syslog(LOG_DEBUG, "internet_addressing: setting email addresses for <%s> to <%s>", usbuf.fullname, new_emailaddrs);
1371
1372         // Delete all of the existing directory index records for the user (easier this way)
1373         for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1374                 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1375                 CtdlDirectoryDelUser(buf, requested_user);
1376         }
1377
1378         strcpy(usbuf.emailaddrs, new_emailaddrs);               // make it official.
1379
1380         // Index all of the new email addresses (they've already been sanitized)
1381         for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1382                 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1383                 CtdlDirectoryAddUser(buf, requested_user);
1384         }
1385
1386         CtdlPutUserLock(&usbuf);
1387 }
1388
1389
1390 /*
1391  * Auto-generate an Internet email address for a user account
1392  */
1393 void AutoGenerateEmailAddressForUser(struct ctdluser *user) {
1394         char synthetic_email_addr[1024];
1395         int i, j;
1396         int u = 0;
1397
1398         for (i=0; u==0; ++i) {
1399                 if (i == 0) {
1400                         // first try just converting the user name to lowercase and replacing spaces with underscores
1401                         snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "%s@%s", user->fullname, CtdlGetConfigStr("c_fqdn"));
1402                         for (j=0; ((synthetic_email_addr[j] != '\0')&&(synthetic_email_addr[j] != '@')); j++) {
1403                                 synthetic_email_addr[j] = tolower(synthetic_email_addr[j]);
1404                                 if (!isalnum(synthetic_email_addr[j])) {
1405                                         synthetic_email_addr[j] = '_';
1406                                 }
1407                         }
1408                 }
1409                 else if (i == 1) {
1410                         // then try 'ctdl' followed by the user number
1411                         snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08lx@%s", user->usernum, CtdlGetConfigStr("c_fqdn"));
1412                 }
1413                 else if (i > 1) {
1414                         // oof.  just keep trying other numbers until we find one
1415                         snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08x@%s", i, CtdlGetConfigStr("c_fqdn"));
1416                 }
1417                 u = CtdlDirectoryLookup(NULL, synthetic_email_addr, 0);
1418                 syslog(LOG_DEBUG, "user_ops: address <%s> lookup returned <%d>", synthetic_email_addr, u);
1419         }
1420
1421         CtdlSetEmailAddressesForUser(user->fullname, synthetic_email_addr);
1422         strncpy(CC->user.emailaddrs, synthetic_email_addr, sizeof(user->emailaddrs));
1423         syslog(LOG_DEBUG, "user_ops: auto-generated email address <%s> for <%s>", synthetic_email_addr, user->fullname);
1424 }
1425
1426
1427 // Determine whether the supplied email address is subscribed to the supplied room's mailing list service.
1428 int is_email_subscribed_to_list(char *email, char *room_name) {
1429         struct ctdlroom room;
1430         long roomnum;
1431         char *roomnetconfig;
1432         int found_it = 0;
1433
1434         if (CtdlGetRoom(&room, room_name)) {
1435                 return(0);                                      // room not found, so definitely not subscribed
1436         }
1437
1438         // If this room has the QR2_SMTP_PUBLIC flag set, anyone may email a post to this room, even non-subscribers.
1439         if (room.QRflags2 & QR2_SMTP_PUBLIC) {
1440                 return(1);
1441         }
1442
1443         roomnum = room.QRnumber;
1444         roomnetconfig = LoadRoomNetConfigFile(roomnum);
1445         if (roomnetconfig == NULL) {
1446                 return(0);
1447         }
1448
1449         // We're going to do a very sloppy match here and simply search for the specified email address
1450         // anywhere in the room's netconfig.  If you don't like this, fix it yourself.
1451         if (bmstrcasestr(roomnetconfig, email)) {
1452                 found_it = 1;
1453         }
1454         else {
1455                 found_it = 0;
1456         }
1457
1458         free(roomnetconfig);
1459         return(found_it);
1460 }