1 // This file contains functions which handle the mapping of Internet addresses
2 // to users on the Citadel system.
4 // Copyright (c) 1987-2024 by the citadel.org team
6 // This program is open source software. Use, duplication, or disclosure is subject to the GNU General Public License version 3.
17 #include <sys/types.h>
22 #include <libcitadel.h>
23 #include "citadel_defs.h"
25 #include "sysdep_decls.h"
26 #include "citserver.h"
30 #include "internet_addressing.h"
33 #include "parsedate.h"
35 #include "ctdl_module.h"
40 // Return nonzero if the supplied name is an alias for this host.
41 int CtdlHostAlias(char *fqdn) {
45 char host[256], type[256];
48 if (fqdn == NULL) return(hostalias_nomatch);
49 if (IsEmptyStr(fqdn)) return(hostalias_nomatch);
50 if (!strcasecmp(fqdn, "localhost")) return(hostalias_localhost);
51 if (!strcasecmp(fqdn, CtdlGetConfigStr("c_fqdn"))) return(hostalias_localhost);
52 if (!strcasecmp(fqdn, CtdlGetConfigStr("c_nodename"))) return(hostalias_localhost);
53 if (inetcfg == NULL) return(hostalias_nomatch);
55 config_lines = num_tokens(inetcfg, '\n');
56 for (i=0; i<config_lines; ++i) {
57 extract_token(buf, inetcfg, i, '\n', sizeof buf);
58 extract_token(host, buf, 0, '|', sizeof host);
59 extract_token(type, buf, 1, '|', sizeof type);
63 // Process these in a specific order, in case there are multiple matches.
64 // We want localhost to override masq, for example.
66 if ( (!strcasecmp(type, "masqdomain")) && (!strcasecmp(fqdn, host))) {
67 found = hostalias_masq;
70 if ( (!strcasecmp(type, "localhost")) && (!strcasecmp(fqdn, host))) {
71 found = hostalias_localhost;
74 // "directory" used to be a distributed version of "localhost" but they're both the same now
75 if ( (!strcasecmp(type, "directory")) && (!strcasecmp(fqdn, host))) {
76 found = hostalias_localhost;
79 if (found) return(found);
81 return(hostalias_nomatch);
85 // Determine whether a given Internet address belongs to the current user
86 int CtdlIsMe(char *addr, int addr_buf_len) {
87 struct recptypes *recp;
90 recp = validate_recipients(addr, 0);
91 if (recp == NULL) return(0);
93 if (recp->num_local == 0) {
94 free_recipients(recp);
98 for (i=0; i<recp->num_local; ++i) {
99 extract_token(addr, recp->recp_local, i, '|', addr_buf_len);
100 if (!strcasecmp(addr, CC->user.fullname)) {
101 free_recipients(recp);
106 free_recipients(recp);
111 // If the last item in a list of recipients was truncated to a partial address,
112 // remove it completely in order to avoid choking library functions.
113 void sanitize_truncated_recipient(char *str) {
115 if (num_tokens(str, ',') < 2) return;
117 int len = strlen(str);
118 if (len < 900) return;
119 if (len > 998) str[998] = 0;
121 char *cptr = strrchr(str, ',');
124 char *lptr = strchr(cptr, '<');
125 char *rptr = strchr(cptr, '>');
127 if ( (lptr) && (rptr) && (rptr > lptr) ) return;
133 // This function is self explanatory.
134 // (What can I say, I'm in a weird mood today...)
135 void remove_any_whitespace_to_the_left_or_right_of_at_symbol(char *name) {
139 for (ptr=name; *ptr; ++ptr) {
140 while ( (isspace(*ptr)) && (*(ptr+1)=='@') ) {
142 if (ptr > name) --ptr;
144 while ( (*ptr=='@') && (*(ptr+1)!=0) && (isspace(*(ptr+1))) ) {
145 strcpy(ptr+1, ptr+2);
151 // values that can be returned by expand_aliases()
153 EA_ERROR, // Can't send message due to bad address
154 EA_MULTIPLE, // Alias expanded into multiple recipients -- run me again!
155 EA_LOCAL, // Local message, do no network processing
156 EA_INTERNET, // Convert msg and send as Internet mail
157 EA_SKIP // This recipient has been invalidated -- skip it!
161 // Process alias and routing info for email addresses
162 int expand_aliases(char *name, char *aliases) {
168 int num_aliases = num_tokens(aliases, '\n');
169 for (a=0; a<num_aliases; ++a) {
170 extract_token(aaa, aliases, a, '\n', sizeof aaa);
171 char *bar = strchr(aaa, '|');
177 if ( (!IsEmptyStr(aaa)) && (!strcasecmp(name, aaa)) ) {
178 syslog(LOG_DEBUG, "internet_addressing: global alias <%s> to <%s>", name, bar);
183 if (strchr(name, ',')) {
188 char original_name[256]; // Now go for the regular aliases
189 safestrncpy(original_name, name, sizeof original_name);
191 // should these checks still be here, or maybe move them to split_recps() ?
193 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
194 stripallbut(name, '<', '>');
196 // Hit the email address directory
197 if (CtdlDirectoryLookup(aaa, name, sizeof aaa) == 0) {
201 if (strcasecmp(original_name, name)) {
202 syslog(LOG_INFO, "internet_addressing: directory alias <%s> to <%s>", original_name, name);
205 // Change "user @ xxx" to "user" if xxx is an alias for this host
206 for (a=0; name[a] != '\0'; ++a) {
207 if (name[a] == '@') {
208 if (CtdlHostAlias(&name[a+1]) == hostalias_localhost) {
210 syslog(LOG_DEBUG, "internet_addressing: host is local, recipient is <%s>", name);
216 // Is this a local or remote recipient?
217 at = haschar(name, '@');
219 return(EA_LOCAL); // no @'s = local address
222 return(EA_INTERNET); // one @ = internet address
225 return(EA_ERROR); // more than one @ = badly formed address
230 // Return a supplied list of email addresses as an array, removing superfluous information and syntax.
231 // If an existing Array is supplied as "append_to" it will do so; otherwise a new Array is allocated.
232 Array *split_recps(char *addresses, Array *append_to) {
234 if (IsEmptyStr(addresses)) { // nothing supplied, nothing returned
238 // Copy the supplied address list into our own memory space, because we are going to modify it.
239 char *a = strdup(addresses);
241 syslog(LOG_ERR, "internet_addressing: malloc() failed: %m");
245 // Strip out anything in double quotes
250 r = strrchr(a, '\"');
256 // Transform all qualifying delimiters to commas
258 for (t=a; t[0]; ++t) {
259 if ((t[0]==';') || (t[0]=='|')) {
264 // Tokenize the recipients into an array. No single recipient should be larger than 256 bytes.
265 Array *recipients_array = NULL;
267 recipients_array = append_to; // Append to an existing array of recipients
270 recipients_array = array_new(256); // This is a new array of recipients
273 int num_addresses = num_tokens(a, ',');
275 for (i=0; i<num_addresses; ++i) {
276 char this_address[256];
277 extract_token(this_address, a, i, ',', sizeof this_address);
278 string_trim(this_address); // strip leading and trailing whitespace
279 stripout(this_address, '(', ')'); // remove any portion in parentheses
280 stripallbut(this_address, '<', '>'); // if angle brackets are present, keep only what is inside them
281 if (!IsEmptyStr(this_address)) {
282 array_append(recipients_array, this_address);
286 free(a); // We don't need this buffer anymore.
287 return(recipients_array); // Return the completed array to the caller.
291 // Validate recipients, count delivery types and errors, and handle aliasing
293 // Returns 0 if all addresses are ok, ret->num_error = -1 if no addresses
294 // were specified, or the number of addresses found invalid.
296 // Caller needs to free the result using free_recipients()
298 struct recptypes *validate_recipients(char *recipients_in, int Flags) {
299 struct recptypes *ret;
304 struct ctdluser tempUS;
305 struct ctdlroom original_room;
311 ret = (struct recptypes *) malloc(sizeof(struct recptypes)); // Initialize
312 if (ret == NULL) return(NULL);
313 memset(ret, 0, sizeof(struct recptypes)); // set all values to null/zero
315 len = strlen(recipients_in) + 1024; // allocate memory
316 ret->errormsg = malloc(len);
317 ret->recp_local = malloc(len);
318 ret->recp_internet = malloc(len);
319 ret->recp_room = malloc(len);
320 ret->display_recp = malloc(len);
321 ret->recp_orgroom = malloc(len);
323 ret->errormsg[0] = 0;
324 ret->recp_local[0] = 0;
325 ret->recp_internet[0] = 0;
326 ret->recp_room[0] = 0;
327 ret->recp_orgroom[0] = 0;
328 ret->display_recp[0] = 0;
329 ret->recptypes_magic = RECPTYPES_MAGIC;
331 Array *recp_array = split_recps(recipients_in, NULL);
333 char *aliases = CtdlGetSysConfig(GLOBAL_ALIASES); // First hit the Global Alias Table
336 for (r=0; (recp_array && r<array_len(recp_array)); ++r) {
337 org_recp = (char *)array_get_element_at(recp_array, r);
338 strncpy(this_recp, org_recp, sizeof this_recp);
341 for (i=0; i<3; ++i) { // pass three times through the aliaser
342 mailtype = expand_aliases(this_recp, aliases);
344 // If an alias expanded to multiple recipients, strip off those recipients and append them
345 // to the end of the array. This loop will hit those again when it gets there.
346 if (mailtype == EA_MULTIPLE) {
347 recp_array = split_recps(this_recp, recp_array);
351 // This loop searches for duplicate recipients in the final list and marks them to be skipped.
353 for (j=0; j<r; ++j) {
354 if (!strcasecmp(this_recp, (char *)array_get_element_at(recp_array, j) )) {
359 syslog(LOG_DEBUG, "Recipient #%d of type %d is <%s>", r, mailtype, this_recp);
363 case EA_LOCAL: // There are several types of "local" recipients.
365 // Old BBS conventions require mail to "sysop" to go somewhere. Send it to the admin room.
366 if (!strcasecmp(this_recp, "sysop")) {
368 strcpy(this_recp, CtdlGetConfigStr("c_aideroom"));
369 if (!IsEmptyStr(ret->recp_room)) {
370 strcat(ret->recp_room, "|");
372 strcat(ret->recp_room, this_recp);
375 // This handles rooms which can receive posts via email.
376 else if (!strncasecmp(this_recp, "room_", 5)) {
377 original_room = CC->room; // Remember where we parked
379 char mail_to_room[ROOMNAMELEN];
381 strncpy(mail_to_room, &this_recp[5], sizeof mail_to_room);
382 for (m = mail_to_room; *m; ++m) {
383 if (m[0] == '_') m[0]=' ';
385 if (!CtdlGetRoom(&CC->room, mail_to_room)) { // Find the room they asked for
387 err = CtdlDoIHavePermissionToPostInThisRoom( // check for write permissions to room
391 0 // 0 means "this is not a reply"
399 if (!IsEmptyStr(ret->recp_room)) {
400 strcat(ret->recp_room, "|");
402 strcat(ret->recp_room, CC->room.QRname);
404 if (!IsEmptyStr(ret->recp_orgroom)) {
405 strcat(ret->recp_orgroom, "|");
407 strcat(ret->recp_orgroom, this_recp);
411 else { // no such room exists
416 // Restore this session's original room location.
417 CC->room = original_room;
421 // This handles the most common case, which is mail to a user's inbox.
422 // (the next line depends on left-to-right evaluation)
423 else if ((CtdlGetUser(&tempUS, this_recp) == 0) && (tempUS.usernum > 0)) {
425 strcpy(this_recp, tempUS.fullname);
426 if (!IsEmptyStr(ret->recp_local)) {
427 strcat(ret->recp_local, "|");
429 strcat(ret->recp_local, this_recp);
432 // No match for this recipient
439 // Yes, you're reading this correctly: if the target domain points back to the local system,
440 // the address is invalid. That's because if the address were valid, we would have
441 // already translated it to a local address by now.
442 if (IsDirectory(this_recp, 0)) {
448 if (!IsEmptyStr(ret->recp_internet)) {
449 strcat(ret->recp_internet, "|");
451 strcat(ret->recp_internet, this_recp);
456 // no action required, anything in this slot has already been processed elsewhere
464 if (IsEmptyStr(errmsg)) {
465 snprintf(append, sizeof append, "Invalid recipient: %s", this_recp);
468 snprintf(append, sizeof append, "%s", errmsg);
470 if ( (strlen(ret->errormsg) + strlen(append) + 3) < SIZ) {
471 if (!IsEmptyStr(ret->errormsg)) {
472 strcat(ret->errormsg, "; ");
474 strcat(ret->errormsg, append);
478 if (IsEmptyStr(ret->display_recp)) {
479 strcpy(append, this_recp);
482 snprintf(append, sizeof append, ", %s", this_recp);
484 if ( (strlen(ret->display_recp)+strlen(append)) < SIZ) {
485 strcat(ret->display_recp, append);
490 if (aliases != NULL) { // ok, we're done with the global alias list now
494 if ( (ret->num_local + ret->num_internet + ret->num_room + ret->num_error) == 0) {
495 ret->num_error = (-1);
496 strcpy(ret->errormsg, "No recipients specified.");
499 syslog(LOG_DEBUG, "internet_addressing: validate_recipients() = %d local, %d room, %d SMTP, %d error",
500 ret->num_local, ret->num_room, ret->num_internet, ret->num_error
504 array_free(recp_array);
511 // Destructor for recptypes
512 void free_recipients(struct recptypes *valid) {
518 if (valid->recptypes_magic != RECPTYPES_MAGIC) {
519 syslog(LOG_ERR, "internet_addressing: attempt to call free_recipients() on some other data type!");
520 exit(CTDLEXIT_BAD_MAGIC);
523 if (valid->errormsg != NULL) free(valid->errormsg);
524 if (valid->recp_local != NULL) free(valid->recp_local);
525 if (valid->recp_internet != NULL) free(valid->recp_internet);
526 if (valid->recp_room != NULL) free(valid->recp_room);
527 if (valid->recp_orgroom != NULL) free(valid->recp_orgroom);
528 if (valid->display_recp != NULL) free(valid->display_recp);
529 if (valid->bounce_to != NULL) free(valid->bounce_to);
530 if (valid->envelope_from != NULL) free(valid->envelope_from);
531 if (valid->sending_room != NULL) free(valid->sending_room);
536 char *qp_encode_email_addrs(char *source) {
537 char *user, *node, *name;
538 const char headerStr[] = "=?UTF-8?Q?";
542 int need_to_encode = 0;
548 long nAddrPtrMax = 50;
553 if (source == NULL) return source;
554 if (IsEmptyStr(source)) return source;
555 syslog(LOG_DEBUG, "internet_addressing: qp_encode_email_addrs <%s>", source);
557 AddrPtr = malloc (sizeof (long) * nAddrPtrMax);
558 AddrUtf8 = malloc (sizeof (long) * nAddrPtrMax);
559 memset(AddrUtf8, 0, sizeof (long) * nAddrPtrMax);
562 while (!IsEmptyStr (&source[i])) {
563 if (nColons >= nAddrPtrMax){
566 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
567 memcpy (ptr, AddrPtr, sizeof (long) * nAddrPtrMax);
568 free (AddrPtr), AddrPtr = ptr;
570 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
571 memset(&ptr[nAddrPtrMax], 0, sizeof (long) * nAddrPtrMax);
573 memcpy (ptr, AddrUtf8, sizeof (long) * nAddrPtrMax);
574 free (AddrUtf8), AddrUtf8 = ptr;
577 if (((unsigned char) source[i] < 32) || ((unsigned char) source[i] > 126)) {
579 AddrUtf8[nColons] = 1;
581 if (source[i] == '"') {
582 InQuotes = !InQuotes;
584 if (!InQuotes && source[i] == ',') {
585 AddrPtr[nColons] = i;
590 if (need_to_encode == 0) {
597 EncodedMaxLen = nColons * (sizeof(headerStr) + 3) + SourceLen * 3;
598 Encoded = (char*) malloc (EncodedMaxLen);
600 for (i = 0; i < nColons; i++) {
601 source[AddrPtr[i]++] = '\0';
603 // TODO: if libidn, this might get larger
604 user = malloc(SourceLen + 1);
605 node = malloc(SourceLen + 1);
606 name = malloc(SourceLen + 1);
610 for (i = 0; i < nColons && nPtr != NULL; i++) {
611 nmax = EncodedMaxLen - (nPtr - Encoded);
613 process_rfc822_addr(&source[AddrPtr[i]], user, node, name);
614 // TODO: libIDN here !
615 if (IsEmptyStr(name)) {
616 n = snprintf(nPtr, nmax, (i==0)?"%s@%s" : ",%s@%s", user, node);
619 EncodedName = rfc2047encode(name, strlen(name));
620 n = snprintf(nPtr, nmax, (i==0)?"%s <%s@%s>" : ",%s <%s@%s>", EncodedName, user, node);
625 n = snprintf(nPtr, nmax, (i==0)?"%s" : ",%s", &source[AddrPtr[i]]);
631 ptr = (char*) malloc(EncodedMaxLen * 2);
632 memcpy(ptr, Encoded, EncodedMaxLen);
633 nnPtr = ptr + (nPtr - Encoded), nPtr = nnPtr;
634 free(Encoded), Encoded = ptr;
636 i--; // do it once more with properly lengthened buffer
639 for (i = 0; i < nColons; i++)
640 source[--AddrPtr[i]] = ',';
651 // Unfold a multi-line field into a single line, removing multi-whitespaces
652 void unfold_rfc822_field(char **field, char **FieldEnd)
655 char *pField = *field;
657 char *pFieldEnd = *FieldEnd;
659 while (isspace(*pField))
661 // remove leading/trailing whitespace
664 while (isspace(*pFieldEnd))
667 *FieldEnd = pFieldEnd;
668 // convert non-space whitespace to spaces, and remove double blanks
669 for (sField = *field = pField; sField < pFieldEnd; pField++, sField++) {
670 if ((*sField=='\r') || (*sField=='\n')) {
672 while ( ( (*(sField + offset) == '\r') || (*(sField + offset) == '\n' )) && (sField + offset < pFieldEnd) ) {
679 if (*sField=='\"') quote = 1 - quote;
681 if (isspace(*sField)) {
686 while ((sField < pFieldEnd) && isspace(*sField))
690 else *pField = *sField;
692 else *pField = *sField;
696 *FieldEnd = pField - 1;
700 // Split an RFC822-style address into userid, host, and full name
701 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name) {
705 strcpy(node, CtdlGetConfigStr("c_fqdn"));
708 if (rfc822 == NULL) return;
710 // extract full name - first, it's From minus <userid>
711 strcpy(name, rfc822);
712 stripout(name, '<', '>');
714 // and anything to the right of a @
715 for (a = 0; name[a] != '\0'; ++a) {
716 if (name[a] == '@') {
722 // but if there are parentheses, that changes the rules...
723 if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
724 strcpy(name, rfc822);
725 stripallbut(name, '(', ')');
728 // but if there are a set of quotes, that supersedes everything
729 if (haschar(rfc822, 34) == 2) {
730 strcpy(name, rfc822);
731 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
732 strcpy(&name[0], &name[1]);
734 strcpy(&name[0], &name[1]);
735 for (a = 0; name[a] != '\0'; ++a)
742 strcpy(user, rfc822);
744 // first get rid of anything in parens
745 stripout(user, '(', ')');
747 // if there's a set of angle brackets, strip it down to that
748 if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
749 stripallbut(user, '<', '>');
752 // and anything to the right of a @
753 for (a = 0; user[a] != '\0'; ++a) {
754 if (user[a] == '@') {
761 strcpy(node, rfc822);
763 // first get rid of anything in parens
764 stripout(node, '(', ')');
766 // if there's a set of angle brackets, strip it down to that
767 if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
768 stripallbut(node, '<', '>');
771 // If no node specified, tack ours on instead
772 if (haschar(node, '@') == 0) {
773 strcpy(node, CtdlGetConfigStr("c_nodename"));
776 // strip anything to the left of a @
777 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0)) {
778 strcpy(node, &node[1]);
782 // strip leading and trailing spaces in all strings
787 // If we processed a string that had the address in angle brackets
788 // but no name outside the brackets, we now have an empty name. In
789 // this case, use the user portion of the address as the name.
790 if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
796 // convert_field() is a helper function for convert_internet_message().
797 // Given start/end positions for an rfc822 field, it converts it to a Citadel
798 // field if it wants to, and unfolds it if necessary.
800 // Returns 1 if the field was converted and inserted into the Citadel message
801 // structure, implying that the source field should be removed from the
803 int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
804 char *key, *value, *valueend;
808 const char *colonpos = NULL;
817 for (pos = end; pos >= beg; pos--) {
818 if (*pos == ':') colonpos = pos;
821 if (colonpos == NULL) return(0); // no colon? not a valid header line
824 key = malloc(len + 2);
825 memcpy(key, beg, len + 1);
827 valueend = key + len;
828 * ( key + (colonpos - beg) ) = '\0';
829 value = &key[(colonpos - beg) + 1];
830 // printf("Header: [%s]\nValue: [%s]\n", key, value);
831 unfold_rfc822_field(&value, &valueend);
832 valuelen = valueend - value + 1;
833 // printf("UnfoldedValue: [%s]\n", value);
835 // Here's the big rfc822-to-citadel loop.
837 // Date/time is converted into a unix timestamp. If the conversion
838 // fails, we replace it with the time the message arrived locally.
839 if (!strcasecmp(key, "Date")) {
840 parsed_date = parsedate(value);
841 if (parsed_date < 0L) parsed_date = time(NULL);
843 if (CM_IsEmpty(msg, eTimestamp))
844 CM_SetFieldLONG(msg, eTimestamp, parsed_date);
848 else if (!strcasecmp(key, "From")) {
849 process_rfc822_addr(value, user, node, name);
850 syslog(LOG_DEBUG, "internet_addressing: converted to <%s@%s> (%s)", user, node, name);
851 snprintf(addr, sizeof(addr), "%s@%s", user, node);
852 if (CM_IsEmpty(msg, eAuthor) && !IsEmptyStr(name)) {
853 CM_SetField(msg, eAuthor, name);
855 if (CM_IsEmpty(msg, erFc822Addr) && !IsEmptyStr(addr)) {
856 CM_SetField(msg, erFc822Addr, addr);
861 else if (!strcasecmp(key, "Subject")) {
862 if (CM_IsEmpty(msg, eMsgSubject))
863 CM_SetField(msg, eMsgSubject, value);
867 else if (!strcasecmp(key, "List-ID")) {
868 if (CM_IsEmpty(msg, eListID))
869 CM_SetField(msg, eListID, value);
873 else if (!strcasecmp(key, "To")) {
874 if (CM_IsEmpty(msg, eRecipient))
875 CM_SetField(msg, eRecipient, value);
879 else if (!strcasecmp(key, "CC")) {
880 if (CM_IsEmpty(msg, eCarbonCopY))
881 CM_SetField(msg, eCarbonCopY, value);
885 else if (!strcasecmp(key, "Message-ID")) {
886 if (!CM_IsEmpty(msg, emessageId)) {
887 syslog(LOG_WARNING, "internet_addressing: duplicate message id");
890 char *pvalue = value; // strip out angle brackets
901 CM_SetField(msg, emessageId, pvalue);
906 else if (!strcasecmp(key, "Return-Path")) {
907 if (CM_IsEmpty(msg, eMessagePath))
908 CM_SetField(msg, eMessagePath, value);
912 else if (!strcasecmp(key, "Envelope-To")) {
913 if (CM_IsEmpty(msg, eenVelopeTo))
914 CM_SetField(msg, eenVelopeTo, value);
918 else if (!strcasecmp(key, "References")) {
919 CM_SetField(msg, eWeferences, value);
923 else if (!strcasecmp(key, "Reply-To")) {
924 CM_SetField(msg, eReplyTo, value);
928 else if (!strcasecmp(key, "In-reply-to")) {
929 if (CM_IsEmpty(msg, eWeferences)) // References: supersedes In-reply-to:
930 CM_SetField(msg, eWeferences, value);
934 // Clean up and move on.
935 free(key); // Don't free 'value', it's actually the same buffer
940 // Convert RFC822 references format (References) to Citadel references format (Weferences)
941 void convert_references_to_wefewences(char *str) {
942 int bracket_nesting = 0;
944 char *moveptr = NULL;
951 if (bracket_nesting < 0) bracket_nesting = 0;
953 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
957 else if (bracket_nesting > 0) {
963 *moveptr = *(moveptr+1);
967 if (ch == '<') ++bracket_nesting;
973 // Convert an RFC822 message (headers + body) to a CtdlMessage structure.
974 // NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
975 // will be deallocated when CM_Free() is called. Therefore, the
976 // supplied buffer should be DEREFERENCED. It should not be freed or used
978 struct CtdlMessage *convert_internet_message(char *rfc822) {
979 StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
981 return convert_internet_message_buf(&RFCBuf);
985 struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822) {
986 struct CtdlMessage *msg;
987 const char *pos, *beg, *end, *totalend;
988 int done, alldone = 0;
990 StrBuf *OtherHeaders;
992 msg = malloc(sizeof(struct CtdlMessage));
993 if (msg == NULL) return msg;
995 memset(msg, 0, sizeof(struct CtdlMessage));
996 msg->cm_magic = CTDLMESSAGE_MAGIC; // self check
997 msg->cm_anon_type = 0; // never anonymous
998 msg->cm_format_type = FMT_RFC822; // internet message
1000 pos = ChrPtr(*rfc822);
1001 totalend = pos + StrLength(*rfc822);
1003 OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
1007 // Locate beginning and end of field, keeping in mind that
1008 // some fields might be multiline
1011 while ((end < totalend) && (end == beg) && (done == 0) ) {
1013 if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) ) {
1017 // done with headers?
1018 if ((*pos=='\n') && ( (*(pos+1)=='\n') || (*(pos+1)=='\r')) ) {
1022 if (pos >= (totalend - 1) ) {
1030 // At this point we have a field. Are we interested in it?
1031 converted = convert_field(msg, beg, end);
1033 // Strip the field out of the RFC822 header if we used it
1035 StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
1036 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1039 // If we've hit the end of the message, bail out
1040 if (pos >= totalend)
1043 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1044 if (pos < totalend) {
1045 StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
1048 CM_SetAsFieldSB(msg, eMessageText, &OtherHeaders);
1050 // Follow-up sanity checks...
1052 // If there's no timestamp on this message, set it to now.
1053 if (CM_IsEmpty(msg, eTimestamp)) {
1054 CM_SetFieldLONG(msg, eTimestamp, time(NULL));
1057 // If a W (references, or rather, Wefewences) field is present, we
1058 // have to convert it from RFC822 format to Citadel format.
1059 if (!CM_IsEmpty(msg, eWeferences)) {
1061 convert_references_to_wefewences(msg->cm_fields[eWeferences]);
1068 // Look for a particular header field in an RFC822 message text. If the
1069 // requested field is found, it is unfolded (if necessary) and returned to
1070 // the caller. The field name is stripped out, leaving only its contents.
1071 // The caller is responsible for freeing the returned buffer. If the requested
1072 // field is not present, or anything else goes wrong, it returns NULL.
1073 char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
1074 char *fieldbuf = NULL;
1075 const char *end_of_headers;
1076 const char *field_start;
1081 // Should never happen, but sometimes we get stupid
1082 if (rfc822 == NULL) return(NULL);
1083 if (fieldname == NULL) return(NULL);
1085 snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
1087 // Locate the end of the headers, so we don't run past that point
1088 end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
1089 if (end_of_headers == NULL) {
1090 end_of_headers = cbmstrcasestr(rfc822, "\n\n");
1092 if (end_of_headers == NULL) return (NULL);
1094 field_start = cbmstrcasestr(rfc822, fieldhdr);
1095 if (field_start == NULL) return(NULL);
1096 if (field_start > end_of_headers) return(NULL);
1098 fieldbuf = malloc(SIZ);
1099 strcpy(fieldbuf, "");
1102 ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
1103 while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
1104 strcat(fieldbuf, " ");
1105 cont = &fieldbuf[strlen(fieldbuf)];
1106 ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
1110 strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
1111 string_trim(fieldbuf);
1117 // *****************************************************************************
1118 // DIRECTORY MANAGEMENT FUNCTIONS
1119 // *****************************************************************************
1121 // Generate the index key for an Internet e-mail address to be looked up
1123 void directory_key(char *key, char *addr) {
1127 for (i=0; !IsEmptyStr(&addr[i]); ++i) {
1128 if (!isspace(addr[i])) {
1129 key[keylen++] = tolower(addr[i]);
1133 syslog(LOG_DEBUG, "internet_addressing: directory key is <%s>", key);
1137 // Return nonzero if the supplied address is in one of "our" domains
1138 int IsDirectory(char *addr, int allow_masq_domains) {
1142 extract_token(domain, addr, 1, '@', sizeof domain);
1143 string_trim(domain);
1145 h = CtdlHostAlias(domain);
1147 if ( (h == hostalias_masq) && allow_masq_domains)
1150 if (h == hostalias_localhost) {
1159 // Add an Internet e-mail address to the directory for a user
1160 int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
1163 if (IsDirectory(internet_addr, 0) == 0) {
1166 syslog(LOG_DEBUG, "internet_addressing: create directory entry: %s --> %s", internet_addr, citadel_addr);
1167 directory_key(key, internet_addr);
1168 cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
1173 // Delete an Internet e-mail address from the directory.
1175 // (NOTE: we don't actually use or need the citadel_addr variable; it's merely
1176 // here because the callback API expects to be able to send it.)
1177 int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
1180 syslog(LOG_DEBUG, "internet_addressing: delete directory entry: %s --> %s", internet_addr, citadel_addr);
1181 directory_key(key, internet_addr);
1182 return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
1186 // Look up an Internet e-mail address in the directory.
1187 // On success: returns 0, and Citadel address stored in 'target'
1188 // On failure: returns nonzero
1189 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
1190 struct cdbdata cdbrec;
1193 // Dump it in there unchanged, just for kicks
1194 if (target != NULL) {
1195 safestrncpy(target, internet_addr, targbuflen);
1198 // Only do lookups for addresses with hostnames in them
1199 if (num_tokens(internet_addr, '@') != 2) return(-1);
1201 // Only do lookups for domains in the directory
1202 if (IsDirectory(internet_addr, 0) == 0) return(-1);
1204 directory_key(key, internet_addr);
1205 cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key));
1206 if (cdbrec.ptr != NULL) {
1207 if (target != NULL) {
1208 safestrncpy(target, cdbrec.ptr, targbuflen);
1217 // Harvest any email addresses that someone might want to have in their "collected addresses" book.
1218 char *harvest_collected_addresses(struct CtdlMessage *msg) {
1221 char user[256], node[256], name[256];
1224 eMsgField field = 0;
1226 if (msg == NULL) return(NULL);
1230 if (!CM_IsEmpty(msg, eAuthor)) {
1231 strcat(addr, msg->cm_fields[eAuthor]);
1233 if (!CM_IsEmpty(msg, erFc822Addr)) {
1235 strcat(addr, msg->cm_fields[erFc822Addr]);
1237 if (IsDirectory(msg->cm_fields[erFc822Addr], 0)) {
1242 if (is_harvestable) {
1243 coll = strdup(addr);
1249 if (coll == NULL) return(NULL);
1251 // Scan both the R (To) and Y (CC) fields
1252 for (i = 0; i < 2; ++i) {
1253 if (i == 0) field = eRecipient;
1254 if (i == 1) field = eCarbonCopY;
1256 if (!CM_IsEmpty(msg, field)) {
1257 for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
1258 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
1259 if (strstr(addr, "=?") != NULL) {
1260 utf8ify_rfc822_string(addr);
1262 process_rfc822_addr(addr, user, node, name);
1263 h = CtdlHostAlias(node);
1264 if (h != hostalias_localhost) {
1265 coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1266 if (coll == NULL) return(NULL);
1267 if (!IsEmptyStr(coll)) {
1277 if (IsEmptyStr(coll)) {
1285 // Helper function for CtdlRebuildDirectoryIndex()
1286 void CtdlRebuildDirectoryIndex_backend(char *username, void *data) {
1289 struct ctdluser usbuf;
1291 if (CtdlGetUser(&usbuf, username) != 0) {
1295 if ( (!IsEmptyStr(usbuf.fullname)) && (!IsEmptyStr(usbuf.emailaddrs)) ) {
1296 for (j=0; j<num_tokens(usbuf.emailaddrs, '|'); ++j) {
1297 char one_email[512];
1298 extract_token(one_email, usbuf.emailaddrs, j, '|', sizeof one_email);
1299 CtdlDirectoryAddUser(one_email, usbuf.fullname);
1305 // Initialize the directory database (erasing anything already there)
1306 void CtdlRebuildDirectoryIndex(void) {
1307 syslog(LOG_INFO, "internet_addressing: rebuilding email address directory index");
1308 cdb_trunc(CDB_DIRECTORY);
1309 ForEachUser(CtdlRebuildDirectoryIndex_backend, NULL);
1313 // Configure Internet email addresses for a user account, updating the Directory Index in the process
1314 void CtdlSetEmailAddressesForUser(char *requested_user, char *new_emailaddrs) {
1315 struct ctdluser usbuf;
1319 if (CtdlGetUserLock(&usbuf, requested_user) != 0) { // We can lock because the DirectoryIndex functions don't lock.
1320 return; // Silently fail here if the specified user does not exist.
1323 syslog(LOG_DEBUG, "internet_addressing: setting email addresses for <%s> to <%s>", usbuf.fullname, new_emailaddrs);
1325 // Delete all of the existing directory index records for the user (easier this way)
1326 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1327 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1328 CtdlDirectoryDelUser(buf, requested_user);
1331 strcpy(usbuf.emailaddrs, new_emailaddrs); // make it official.
1333 // Index all of the new email addresses (they've already been sanitized)
1334 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1335 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1336 CtdlDirectoryAddUser(buf, requested_user);
1339 CtdlPutUserLock(&usbuf);
1343 // Auto-generate an Internet email address for a user account
1344 void AutoGenerateEmailAddressForUser(struct ctdluser *user) {
1345 char synthetic_email_addr[1024];
1349 for (i=0; u==0; ++i) {
1351 // first try just converting the user name to lowercase and replacing spaces with underscores
1352 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "%s@%s", user->fullname, CtdlGetConfigStr("c_fqdn"));
1353 for (j=0; ((synthetic_email_addr[j] != '\0')&&(synthetic_email_addr[j] != '@')); j++) {
1354 synthetic_email_addr[j] = tolower(synthetic_email_addr[j]);
1355 if (!isalnum(synthetic_email_addr[j])) {
1356 synthetic_email_addr[j] = '_';
1361 // then try 'ctdl' followed by the user number
1362 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08lx@%s", user->usernum, CtdlGetConfigStr("c_fqdn"));
1365 // oof. just keep trying other numbers until we find one
1366 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08x@%s", i, CtdlGetConfigStr("c_fqdn"));
1368 u = CtdlDirectoryLookup(NULL, synthetic_email_addr, 0);
1369 syslog(LOG_DEBUG, "user_ops: address <%s> lookup returned <%d>", synthetic_email_addr, u);
1372 CtdlSetEmailAddressesForUser(user->fullname, synthetic_email_addr);
1373 strncpy(CC->user.emailaddrs, synthetic_email_addr, sizeof(user->emailaddrs));
1374 syslog(LOG_DEBUG, "user_ops: auto-generated email address <%s> for <%s>", synthetic_email_addr, user->fullname);
1378 // Determine whether the supplied email address is subscribed to the supplied room's mailing list service.
1379 int is_email_subscribed_to_list(char *email, char *room_name) {
1380 struct ctdlroom room;
1382 char *roomnetconfig;
1385 if (CtdlGetRoom(&room, room_name)) {
1386 return(0); // room not found, so definitely not subscribed
1389 // If this room has the QR2_SMTP_PUBLIC flag set, anyone may email a post to this room, even non-subscribers.
1390 if (room.QRflags2 & QR2_SMTP_PUBLIC) {
1394 roomnum = room.QRnumber;
1395 roomnetconfig = LoadRoomNetConfigFile(roomnum);
1396 if (roomnetconfig == NULL) {
1400 // We're going to do a very sloppy match here and simply search for the specified email address
1401 // anywhere in the room's netconfig. If you don't like this, fix it yourself.
1402 if (bmstrcasestr(roomnetconfig, email)) {
1409 free(roomnetconfig);