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