1 // This file contains functions which handle the mapping of Internet addresses
2 // to users on the Citadel system.
4 // Copyright (c) 1987-2022 by the citadel.org team
6 // This program is open source software; you can redistribute it and/or modify
7 // it under the terms of the GNU General Public License version 3.
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
23 #include <sys/types.h>
28 #include <libcitadel.h>
31 #include "sysdep_decls.h"
32 #include "citserver.h"
36 #include "internet_addressing.h"
39 #include "parsedate.h"
41 #include "ctdl_module.h"
45 // This is the non-define version in case it is needed for debugging
47 inline void FindNextEnd (char *bptr, char *end)
49 /* Find the next ?Q? */
50 end = strchr(bptr + 2, '?');
51 if (end == NULL) return NULL;
52 if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) &&
53 (*(end + 2) == '?')) {
54 /* skip on to the end of the cluster, the next ?= */
55 end = strstr(end + 3, "?=");
58 /* sort of half valid encoding, try to find an end. */
59 end = strstr(bptr, "?=");
63 #define FindNextEnd(bptr, end) { \
64 end = strchr(bptr + 2, '?'); \
66 if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) && (*(end + 2) == '?')) { \
67 end = strstr(end + 3, "?="); \
68 } else end = strstr(bptr, "?="); \
72 // Handle subjects with RFC2047 encoding such as:
73 // =?koi8-r?B?78bP0s3Mxc7JxSDXz9rE1dvO2c3JINvB0sHNySDP?=
74 void utf8ify_rfc822_string(char *buf) {
75 char *start, *end, *next, *nextend, *ptr;
80 iconv_t ic = (iconv_t)(-1) ;
81 char *ibuf; // Buffer of characters to be converted
82 char *obuf; // Buffer for converted characters
83 size_t ibuflen; // Length of input buffer
84 size_t obuflen; // Length of output buffer
85 char *isav; // Saved pointer to input buffer
86 char *osav; // Saved pointer to output buffer
89 int illegal_non_rfc2047_encoding = 0;
91 // Sometimes, badly formed messages contain strings which were simply
92 // written out directly in some foreign character set instead of
93 // using RFC2047 encoding. This is illegal but we will attempt to
94 // handle it anyway by converting from a user-specified default
95 // charset to UTF-8 if we see any nonprintable characters.
97 for (i=0; i<len; ++i) {
98 if ((buf[i] < 32) || (buf[i] > 126)) {
99 illegal_non_rfc2047_encoding = 1;
100 i = len; // take a shortcut, it won't be more than one.
103 if (illegal_non_rfc2047_encoding) {
104 const char *default_header_charset = "iso-8859-1";
105 if ( (strcasecmp(default_header_charset, "UTF-8")) && (strcasecmp(default_header_charset, "us-ascii")) ) {
106 ctdl_iconv_open("UTF-8", default_header_charset, &ic);
107 if (ic != (iconv_t)(-1) ) {
110 safestrncpy(ibuf, buf, 1024);
111 ibuflen = strlen(ibuf);
113 obuf = (char *) malloc(obuflen);
115 iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
116 osav[1024-obuflen] = 0;
125 // pre evaluate the first pair
126 nextend = end = NULL;
128 start = strstr(buf, "=?");
130 FindNextEnd (start, end);
132 while ((start != NULL) && (end != NULL)) {
133 next = strstr(end, "=?");
135 FindNextEnd(next, nextend);
139 // did we find two partitions
140 if ((next != NULL) && ((next - end) > 2)) {
142 while ((ptr < next) &&
148 // did we find a gab just filled with blanks?
150 memmove(end + 2, next, len - (next - start));
152 // now terminate the gab at the end
153 delta = (next - end) - 2;
157 // move next to its new location.
162 // our next-pair is our new first pair now.
167 // Now we handle foreign character sets properly encoded in RFC2047 format.
168 start = strstr(buf, "=?");
169 FindNextEnd((start != NULL)? start : buf, end);
170 while (start != NULL && end != NULL && end > start) {
171 extract_token(charset, start, 1, '?', sizeof charset);
172 extract_token(encoding, start, 2, '?', sizeof encoding);
173 extract_token(istr, start, 3, '?', sizeof istr);
177 if (!strcasecmp(encoding, "B")) { // base64
178 ibuflen = CtdlDecodeBase64(ibuf, istr, strlen(istr));
180 else if (!strcasecmp(encoding, "Q")) { // quoted-printable
187 if (istr[pos] == '_') istr[pos] = ' ';
190 ibuflen = CtdlDecodeQuotedPrintable(ibuf, istr, len);
193 strcpy(ibuf, istr); // unknown encoding
194 ibuflen = strlen(istr);
197 ctdl_iconv_open("UTF-8", charset, &ic);
198 if (ic != (iconv_t)(-1) ) {
200 obuf = (char *) malloc(obuflen);
202 iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
203 osav[1024-obuflen] = 0;
208 remove_token(end, 0, '?');
209 remove_token(end, 0, '?');
210 remove_token(end, 0, '?');
211 remove_token(end, 0, '?');
212 strcpy(end, &end[1]);
214 snprintf(newbuf, sizeof newbuf, "%s%s%s", buf, osav, end);
223 remove_token(end, 0, '?');
224 remove_token(end, 0, '?');
225 remove_token(end, 0, '?');
226 remove_token(end, 0, '?');
227 strcpy(end, &end[1]);
229 snprintf(newbuf, sizeof newbuf, "%s(unreadable)%s", buf, end);
235 // Since spammers will go to all sorts of absurd lengths to get their
236 // messages through, there are LOTS of corrupt headers out there.
237 // So, prevent a really badly formed RFC2047 header from throwing
238 // this function into an infinite loop.
240 if (passes > 20) return;
242 start = strstr(buf, "=?");
243 FindNextEnd((start != NULL)? start : buf, end);
248 inline void utf8ify_rfc822_string(char *a){};
253 char *inetcfg = NULL;
255 // Return nonzero if the supplied name is an alias for this host.
256 int CtdlHostAlias(char *fqdn) {
260 char host[256], type[256];
263 if (fqdn == NULL) return(hostalias_nomatch);
264 if (IsEmptyStr(fqdn)) return(hostalias_nomatch);
265 if (!strcasecmp(fqdn, "localhost")) return(hostalias_localhost);
266 if (!strcasecmp(fqdn, CtdlGetConfigStr("c_fqdn"))) return(hostalias_localhost);
267 if (!strcasecmp(fqdn, CtdlGetConfigStr("c_nodename"))) return(hostalias_localhost);
268 if (inetcfg == NULL) return(hostalias_nomatch);
270 config_lines = num_tokens(inetcfg, '\n');
271 for (i=0; i<config_lines; ++i) {
272 extract_token(buf, inetcfg, i, '\n', sizeof buf);
273 extract_token(host, buf, 0, '|', sizeof host);
274 extract_token(type, buf, 1, '|', sizeof type);
278 // Process these in a specific order, in case there are multiple matches.
279 // We want localhost to override masq, for example.
281 if ( (!strcasecmp(type, "masqdomain")) && (!strcasecmp(fqdn, host))) {
282 found = hostalias_masq;
285 if ( (!strcasecmp(type, "localhost")) && (!strcasecmp(fqdn, host))) {
286 found = hostalias_localhost;
289 // "directory" used to be a distributed version of "localhost" but they're both the same now
290 if ( (!strcasecmp(type, "directory")) && (!strcasecmp(fqdn, host))) {
291 found = hostalias_localhost;
294 if (found) return(found);
296 return(hostalias_nomatch);
300 // Determine whether a given Internet address belongs to the current user
301 int CtdlIsMe(char *addr, int addr_buf_len) {
302 struct recptypes *recp;
305 recp = validate_recipients(addr, NULL, 0);
306 if (recp == NULL) return(0);
308 if (recp->num_local == 0) {
309 free_recipients(recp);
313 for (i=0; i<recp->num_local; ++i) {
314 extract_token(addr, recp->recp_local, i, '|', addr_buf_len);
315 if (!strcasecmp(addr, CC->user.fullname)) {
316 free_recipients(recp);
321 free_recipients(recp);
326 // If the last item in a list of recipients was truncated to a partial address,
327 // remove it completely in order to avoid choking library functions.
328 void sanitize_truncated_recipient(char *str) {
330 if (num_tokens(str, ',') < 2) return;
332 int len = strlen(str);
333 if (len < 900) return;
334 if (len > 998) str[998] = 0;
336 char *cptr = strrchr(str, ',');
339 char *lptr = strchr(cptr, '<');
340 char *rptr = strchr(cptr, '>');
342 if ( (lptr) && (rptr) && (rptr > lptr) ) return;
348 // This function is self explanatory.
349 // (What can I say, I'm in a weird mood today...)
350 void remove_any_whitespace_to_the_left_or_right_of_at_symbol(char *name) {
354 for (ptr=name; *ptr; ++ptr) {
355 while ( (isspace(*ptr)) && (*(ptr+1)=='@') ) {
357 if (ptr > name) --ptr;
359 while ( (*ptr=='@') && (*(ptr+1)!=0) && (isspace(*(ptr+1))) ) {
360 strcpy(ptr+1, ptr+2);
366 // values that can be returned by expand_aliases()
368 EA_ERROR, // Can't send message due to bad address
369 EA_MULTIPLE, // Alias expanded into multiple recipients -- run me again!
370 EA_LOCAL, // Local message, do no network processing
371 EA_INTERNET, // Convert msg and send as Internet mail
372 EA_SKIP // This recipient has been invalidated -- skip it!
376 // Process alias and routing info for email addresses
377 int expand_aliases(char *name, char *aliases) {
383 int num_aliases = num_tokens(aliases, '\n');
384 for (a=0; a<num_aliases; ++a) {
385 extract_token(aaa, aliases, a, '\n', sizeof aaa);
386 char *bar = strchr(aaa, '|');
392 if ( (!IsEmptyStr(aaa)) && (!strcasecmp(name, aaa)) ) {
393 syslog(LOG_DEBUG, "internet_addressing: global alias <%s> to <%s>", name, bar);
398 if (strchr(name, ',')) {
403 char original_name[256]; // Now go for the regular aliases
404 safestrncpy(original_name, name, sizeof original_name);
406 // should these checks still be here, or maybe move them to split_recps() ?
408 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
409 stripallbut(name, '<', '>');
411 // Hit the email address directory
412 if (CtdlDirectoryLookup(aaa, name, sizeof aaa) == 0) {
416 if (strcasecmp(original_name, name)) {
417 syslog(LOG_INFO, "internet_addressing: directory alias <%s> to <%s>", original_name, name);
420 // Change "user @ xxx" to "user" if xxx is an alias for this host
421 for (a=0; name[a] != '\0'; ++a) {
422 if (name[a] == '@') {
423 if (CtdlHostAlias(&name[a+1]) == hostalias_localhost) {
425 syslog(LOG_DEBUG, "internet_addressing: host is local, recipient is <%s>", name);
431 // Is this a local or remote recipient?
432 at = haschar(name, '@');
434 return(EA_LOCAL); // no @'s = local address
437 return(EA_INTERNET); // one @ = internet address
440 return(EA_ERROR); // more than one @ = badly formed address
445 // Return a supplied list of email addresses as an array, removing superfluous information and syntax.
446 // If an existing Array is supplied as "append_to" it will do so; otherwise a new Array is allocated.
447 Array *split_recps(char *addresses, Array *append_to) {
449 if (IsEmptyStr(addresses)) { // nothing supplied, nothing returned
453 // Copy the supplied address list into our own memory space, because we are going to modify it.
454 char *a = strdup(addresses);
456 syslog(LOG_ERR, "internet_addressing: malloc() failed: %m");
460 // Strip out anything in double quotes
465 r = strrchr(a, '\"');
471 // Transform all qualifying delimiters to commas
473 for (t=a; t[0]; ++t) {
474 if ((t[0]==';') || (t[0]=='|')) {
479 // Tokenize the recipients into an array. No single recipient should be larger than 256 bytes.
480 Array *recipients_array = NULL;
482 recipients_array = append_to; // Append to an existing array of recipients
485 recipients_array = array_new(256); // This is a new array of recipients
488 int num_addresses = num_tokens(a, ',');
490 for (i=0; i<num_addresses; ++i) {
491 char this_address[256];
492 extract_token(this_address, a, i, ',', sizeof this_address);
493 striplt(this_address); // strip leading and trailing whitespace
494 stripout(this_address, '(', ')'); // remove any portion in parentheses
495 stripallbut(this_address, '<', '>'); // if angle brackets are present, keep only what is inside them
496 if (!IsEmptyStr(this_address)) {
497 array_append(recipients_array, this_address);
501 free(a); // We don't need this buffer anymore.
502 return(recipients_array); // Return the completed array to the caller.
506 // Validate recipients, count delivery types and errors, and handle aliasing
508 // Returns 0 if all addresses are ok, ret->num_error = -1 if no addresses
509 // were specified, or the number of addresses found invalid.
511 // Caller needs to free the result using free_recipients()
513 struct recptypes *validate_recipients(char *supplied_recipients, const char *RemoteIdentifier, int Flags) {
514 struct recptypes *ret;
515 char *recipients = NULL;
520 struct ctdluser tempUS;
521 struct ctdlroom original_room;
527 ret = (struct recptypes *) malloc(sizeof(struct recptypes)); // Initialize
528 if (ret == NULL) return(NULL);
529 memset(ret, 0, sizeof(struct recptypes)); // set all values to null/zero
531 if (supplied_recipients == NULL) {
532 recipients = strdup("");
535 recipients = strdup(supplied_recipients);
538 len = strlen(recipients) + 1024; // allocate memory
539 ret->errormsg = malloc(len);
540 ret->recp_local = malloc(len);
541 ret->recp_internet = malloc(len);
542 ret->recp_room = malloc(len);
543 ret->display_recp = malloc(len);
544 ret->recp_orgroom = malloc(len);
546 ret->errormsg[0] = 0;
547 ret->recp_local[0] = 0;
548 ret->recp_internet[0] = 0;
549 ret->recp_room[0] = 0;
550 ret->recp_orgroom[0] = 0;
551 ret->display_recp[0] = 0;
552 ret->recptypes_magic = RECPTYPES_MAGIC;
554 Array *recp_array = split_recps(supplied_recipients, NULL);
556 char *aliases = CtdlGetSysConfig(GLOBAL_ALIASES); // First hit the Global Alias Table
559 for (r=0; (recp_array && r<array_len(recp_array)); ++r) {
560 org_recp = (char *)array_get_element_at(recp_array, r);
561 strncpy(this_recp, org_recp, sizeof this_recp);
564 for (i=0; i<3; ++i) { // pass three times through the aliaser
565 mailtype = expand_aliases(this_recp, aliases);
567 // If an alias expanded to multiple recipients, strip off those recipients and append them
568 // to the end of the array. This loop will hit those again when it gets there.
569 if (mailtype == EA_MULTIPLE) {
570 recp_array = split_recps(this_recp, recp_array);
574 // This loop searches for duplicate recipients in the final list and marks them to be skipped.
576 for (j=0; j<r; ++j) {
577 if (!strcasecmp(this_recp, (char *)array_get_element_at(recp_array, j) )) {
582 syslog(LOG_DEBUG, "Recipient #%d of type %d is <%s>", r, mailtype, this_recp);
586 case EA_LOCAL: // There are several types of "local" recipients.
588 // Old BBS conventions require mail to "sysop" to go somewhere. Send it to the admin room.
589 if (!strcasecmp(this_recp, "sysop")) {
591 strcpy(this_recp, CtdlGetConfigStr("c_aideroom"));
592 if (!IsEmptyStr(ret->recp_room)) {
593 strcat(ret->recp_room, "|");
595 strcat(ret->recp_room, this_recp);
598 // This handles rooms which can receive posts via email.
599 else if (!strncasecmp(this_recp, "room_", 5)) {
600 original_room = CC->room; // Remember where we parked
602 char mail_to_room[ROOMNAMELEN];
604 strncpy(mail_to_room, &this_recp[5], sizeof mail_to_room);
605 for (m = mail_to_room; *m; ++m) {
606 if (m[0] == '_') m[0]=' ';
608 if (!CtdlGetRoom(&CC->room, mail_to_room)) { // Find the room they asked for
610 err = CtdlDoIHavePermissionToPostInThisRoom( // check for write permissions to room
615 0 // 0 means "this is not a reply"
623 if (!IsEmptyStr(ret->recp_room)) {
624 strcat(ret->recp_room, "|");
626 strcat(ret->recp_room, CC->room.QRname);
628 if (!IsEmptyStr(ret->recp_orgroom)) {
629 strcat(ret->recp_orgroom, "|");
631 strcat(ret->recp_orgroom, this_recp);
635 else { // no such room exists
640 // Restore this session's original room location.
641 CC->room = original_room;
645 // This handles the most common case, which is mail to a user's inbox.
646 else if (CtdlGetUser(&tempUS, this_recp) == 0) {
648 strcpy(this_recp, tempUS.fullname);
649 if (!IsEmptyStr(ret->recp_local)) {
650 strcat(ret->recp_local, "|");
652 strcat(ret->recp_local, this_recp);
655 // No match for this recipient
662 // Yes, you're reading this correctly: if the target domain points back to the local system,
663 // the address is invalid. That's because if the address were valid, we would have
664 // already translated it to a local address by now.
665 if (IsDirectory(this_recp, 0)) {
671 if (!IsEmptyStr(ret->recp_internet)) {
672 strcat(ret->recp_internet, "|");
674 strcat(ret->recp_internet, this_recp);
679 // no action required, anything in this slot has already been processed elsewhere
687 if (IsEmptyStr(errmsg)) {
688 snprintf(append, sizeof append, "Invalid recipient: %s", this_recp);
691 snprintf(append, sizeof append, "%s", errmsg);
693 if ( (strlen(ret->errormsg) + strlen(append) + 3) < SIZ) {
694 if (!IsEmptyStr(ret->errormsg)) {
695 strcat(ret->errormsg, "; ");
697 strcat(ret->errormsg, append);
701 if (IsEmptyStr(ret->display_recp)) {
702 strcpy(append, this_recp);
705 snprintf(append, sizeof append, ", %s", this_recp);
707 if ( (strlen(ret->display_recp)+strlen(append)) < SIZ) {
708 strcat(ret->display_recp, append);
713 if (aliases != NULL) { // ok, we're done with the global alias list now
717 if ( (ret->num_local + ret->num_internet + ret->num_room + ret->num_error) == 0) {
718 ret->num_error = (-1);
719 strcpy(ret->errormsg, "No recipients specified.");
722 syslog(LOG_DEBUG, "internet_addressing: validate_recipients() = %d local, %d room, %d SMTP, %d error",
723 ret->num_local, ret->num_room, ret->num_internet, ret->num_error
728 array_free(recp_array);
735 // Destructor for recptypes
736 void free_recipients(struct recptypes *valid) {
742 if (valid->recptypes_magic != RECPTYPES_MAGIC) {
743 syslog(LOG_ERR, "internet_addressing: attempt to call free_recipients() on some other data type!");
747 if (valid->errormsg != NULL) free(valid->errormsg);
748 if (valid->recp_local != NULL) free(valid->recp_local);
749 if (valid->recp_internet != NULL) free(valid->recp_internet);
750 if (valid->recp_room != NULL) free(valid->recp_room);
751 if (valid->recp_orgroom != NULL) free(valid->recp_orgroom);
752 if (valid->display_recp != NULL) free(valid->display_recp);
753 if (valid->bounce_to != NULL) free(valid->bounce_to);
754 if (valid->envelope_from != NULL) free(valid->envelope_from);
755 if (valid->sending_room != NULL) free(valid->sending_room);
760 char *qp_encode_email_addrs(char *source) {
761 char *user, *node, *name;
762 const char headerStr[] = "=?UTF-8?Q?";
766 int need_to_encode = 0;
772 long nAddrPtrMax = 50;
777 if (source == NULL) return source;
778 if (IsEmptyStr(source)) return source;
779 syslog(LOG_DEBUG, "internet_addressing: qp_encode_email_addrs <%s>", source);
781 AddrPtr = malloc (sizeof (long) * nAddrPtrMax);
782 AddrUtf8 = malloc (sizeof (long) * nAddrPtrMax);
783 memset(AddrUtf8, 0, sizeof (long) * nAddrPtrMax);
786 while (!IsEmptyStr (&source[i])) {
787 if (nColons >= nAddrPtrMax){
790 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
791 memcpy (ptr, AddrPtr, sizeof (long) * nAddrPtrMax);
792 free (AddrPtr), AddrPtr = ptr;
794 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
795 memset(&ptr[nAddrPtrMax], 0, sizeof (long) * nAddrPtrMax);
797 memcpy (ptr, AddrUtf8, sizeof (long) * nAddrPtrMax);
798 free (AddrUtf8), AddrUtf8 = ptr;
801 if (((unsigned char) source[i] < 32) || ((unsigned char) source[i] > 126)) {
803 AddrUtf8[nColons] = 1;
805 if (source[i] == '"') {
806 InQuotes = !InQuotes;
808 if (!InQuotes && source[i] == ',') {
809 AddrPtr[nColons] = i;
814 if (need_to_encode == 0) {
821 EncodedMaxLen = nColons * (sizeof(headerStr) + 3) + SourceLen * 3;
822 Encoded = (char*) malloc (EncodedMaxLen);
824 for (i = 0; i < nColons; i++) {
825 source[AddrPtr[i]++] = '\0';
827 // TODO: if libidn, this might get larger
828 user = malloc(SourceLen + 1);
829 node = malloc(SourceLen + 1);
830 name = malloc(SourceLen + 1);
834 for (i = 0; i < nColons && nPtr != NULL; i++) {
835 nmax = EncodedMaxLen - (nPtr - Encoded);
837 process_rfc822_addr(&source[AddrPtr[i]], user, node, name);
838 // TODO: libIDN here !
839 if (IsEmptyStr(name)) {
840 n = snprintf(nPtr, nmax, (i==0)?"%s@%s" : ",%s@%s", user, node);
843 EncodedName = rfc2047encode(name, strlen(name));
844 n = snprintf(nPtr, nmax, (i==0)?"%s <%s@%s>" : ",%s <%s@%s>", EncodedName, user, node);
849 n = snprintf(nPtr, nmax, (i==0)?"%s" : ",%s", &source[AddrPtr[i]]);
855 ptr = (char*) malloc(EncodedMaxLen * 2);
856 memcpy(ptr, Encoded, EncodedMaxLen);
857 nnPtr = ptr + (nPtr - Encoded), nPtr = nnPtr;
858 free(Encoded), Encoded = ptr;
860 i--; // do it once more with properly lengthened buffer
863 for (i = 0; i < nColons; i++)
864 source[--AddrPtr[i]] = ',';
875 // Unfold a multi-line field into a single line, removing multi-whitespaces
876 void unfold_rfc822_field(char **field, char **FieldEnd)
879 char *pField = *field;
881 char *pFieldEnd = *FieldEnd;
883 while (isspace(*pField))
885 // remove leading/trailing whitespace
888 while (isspace(*pFieldEnd))
891 *FieldEnd = pFieldEnd;
892 // convert non-space whitespace to spaces, and remove double blanks
893 for (sField = *field = pField;
897 if ((*sField=='\r') || (*sField=='\n'))
900 while ( ( (*(sField + offset) == '\r') || (*(sField + offset) == '\n' )) && (sField + offset < pFieldEnd) ) {
907 if (*sField=='\"') quote = 1 - quote;
909 if (isspace(*sField)) {
914 while ((sField < pFieldEnd) &&
919 else *pField = *sField;
921 else *pField = *sField;
925 *FieldEnd = pField - 1;
929 // Split an RFC822-style address into userid, host, and full name
931 // Note: This still handles obsolete address syntaxes such as user%node@node and ...node!user
932 // We should probably remove that.
933 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name) {
937 strcpy(node, CtdlGetConfigStr("c_fqdn"));
940 if (rfc822 == NULL) return;
942 // extract full name - first, it's From minus <userid>
943 strcpy(name, rfc822);
944 stripout(name, '<', '>');
946 // strip anything to the left of a bang
947 while ((!IsEmptyStr(name)) && (haschar(name, '!') > 0))
948 strcpy(name, &name[1]);
950 // and anything to the right of a @ or %
951 for (a = 0; name[a] != '\0'; ++a) {
952 if (name[a] == '@') {
956 if (name[a] == '%') {
962 // but if there are parentheses, that changes the rules...
963 if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
964 strcpy(name, rfc822);
965 stripallbut(name, '(', ')');
968 // but if there are a set of quotes, that supersedes everything
969 if (haschar(rfc822, 34) == 2) {
970 strcpy(name, rfc822);
971 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
972 strcpy(&name[0], &name[1]);
974 strcpy(&name[0], &name[1]);
975 for (a = 0; name[a] != '\0'; ++a)
982 strcpy(user, rfc822);
984 // first get rid of anything in parens
985 stripout(user, '(', ')');
987 // if there's a set of angle brackets, strip it down to that
988 if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
989 stripallbut(user, '<', '>');
992 // strip anything to the left of a bang
993 while ((!IsEmptyStr(user)) && (haschar(user, '!') > 0))
994 strcpy(user, &user[1]);
996 // and anything to the right of a @ or %
997 for (a = 0; user[a] != '\0'; ++a) {
998 if (user[a] == '@') {
1002 if (user[a] == '%') {
1009 // extract node name
1010 strcpy(node, rfc822);
1012 // first get rid of anything in parens
1013 stripout(node, '(', ')');
1015 // if there's a set of angle brackets, strip it down to that
1016 if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
1017 stripallbut(node, '<', '>');
1020 // If no node specified, tack ours on instead
1022 (haschar(node, '@')==0)
1023 && (haschar(node, '%')==0)
1024 && (haschar(node, '!')==0)
1026 strcpy(node, CtdlGetConfigStr("c_nodename"));
1030 // strip anything to the left of a @
1031 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0))
1032 strcpy(node, &node[1]);
1034 // strip anything to the left of a %
1035 while ((!IsEmptyStr(node)) && (haschar(node, '%') > 0))
1036 strcpy(node, &node[1]);
1038 // reduce multiple system bang paths to node!user
1039 while ((!IsEmptyStr(node)) && (haschar(node, '!') > 1))
1040 strcpy(node, &node[1]);
1042 // now get rid of the user portion of a node!user string
1043 for (a = 0; node[a] != '\0'; ++a)
1044 if (node[a] == '!') {
1050 // strip leading and trailing spaces in all strings
1055 // If we processed a string that had the address in angle brackets
1056 // but no name outside the brackets, we now have an empty name. In
1057 // this case, use the user portion of the address as the name.
1058 if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
1064 // convert_field() is a helper function for convert_internet_message().
1065 // Given start/end positions for an rfc822 field, it converts it to a Citadel
1066 // field if it wants to, and unfolds it if necessary.
1068 // Returns 1 if the field was converted and inserted into the Citadel message
1069 // structure, implying that the source field should be removed from the
1071 int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
1072 char *key, *value, *valueend;
1076 const char *colonpos = NULL;
1085 for (pos = end; pos >= beg; pos--) {
1086 if (*pos == ':') colonpos = pos;
1089 if (colonpos == NULL) return(0); /* no colon? not a valid header line */
1092 key = malloc(len + 2);
1093 memcpy(key, beg, len + 1);
1095 valueend = key + len;
1096 * ( key + (colonpos - beg) ) = '\0';
1097 value = &key[(colonpos - beg) + 1];
1098 // printf("Header: [%s]\nValue: [%s]\n", key, value);
1099 unfold_rfc822_field(&value, &valueend);
1100 valuelen = valueend - value + 1;
1101 // printf("UnfoldedValue: [%s]\n", value);
1103 // Here's the big rfc822-to-citadel loop.
1105 // Date/time is converted into a unix timestamp. If the conversion
1106 // fails, we replace it with the time the message arrived locally.
1107 if (!strcasecmp(key, "Date")) {
1108 parsed_date = parsedate(value);
1109 if (parsed_date < 0L) parsed_date = time(NULL);
1111 if (CM_IsEmpty(msg, eTimestamp))
1112 CM_SetFieldLONG(msg, eTimestamp, parsed_date);
1116 else if (!strcasecmp(key, "From")) {
1117 process_rfc822_addr(value, user, node, name);
1118 syslog(LOG_DEBUG, "internet_addressing: converted to <%s@%s> (%s)", user, node, name);
1119 snprintf(addr, sizeof(addr), "%s@%s", user, node);
1120 if (CM_IsEmpty(msg, eAuthor) && !IsEmptyStr(name)) {
1121 CM_SetField(msg, eAuthor, name, -1);
1123 if (CM_IsEmpty(msg, erFc822Addr) && !IsEmptyStr(addr)) {
1124 CM_SetField(msg, erFc822Addr, addr, -1);
1129 else if (!strcasecmp(key, "Subject")) {
1130 if (CM_IsEmpty(msg, eMsgSubject))
1131 CM_SetField(msg, eMsgSubject, value, valuelen);
1135 else if (!strcasecmp(key, "List-ID")) {
1136 if (CM_IsEmpty(msg, eListID))
1137 CM_SetField(msg, eListID, value, valuelen);
1141 else if (!strcasecmp(key, "To")) {
1142 if (CM_IsEmpty(msg, eRecipient))
1143 CM_SetField(msg, eRecipient, value, valuelen);
1147 else if (!strcasecmp(key, "CC")) {
1148 if (CM_IsEmpty(msg, eCarbonCopY))
1149 CM_SetField(msg, eCarbonCopY, value, valuelen);
1153 else if (!strcasecmp(key, "Message-ID")) {
1154 if (!CM_IsEmpty(msg, emessageId)) {
1155 syslog(LOG_WARNING, "internet_addressing: duplicate message id");
1162 pValueLen = valuelen;
1163 // Strip angle brackets
1164 while (haschar(pValue, '<') > 0) {
1169 for (i = 0; i <= pValueLen; ++i)
1170 if (pValue[i] == '>') {
1175 CM_SetField(msg, emessageId, pValue, pValueLen);
1181 else if (!strcasecmp(key, "Return-Path")) {
1182 if (CM_IsEmpty(msg, eMessagePath))
1183 CM_SetField(msg, eMessagePath, value, valuelen);
1187 else if (!strcasecmp(key, "Envelope-To")) {
1188 if (CM_IsEmpty(msg, eenVelopeTo))
1189 CM_SetField(msg, eenVelopeTo, value, valuelen);
1193 else if (!strcasecmp(key, "References")) {
1194 CM_SetField(msg, eWeferences, value, valuelen);
1198 else if (!strcasecmp(key, "Reply-To")) {
1199 CM_SetField(msg, eReplyTo, value, valuelen);
1203 else if (!strcasecmp(key, "In-reply-to")) {
1204 if (CM_IsEmpty(msg, eWeferences)) // References: supersedes In-reply-to:
1205 CM_SetField(msg, eWeferences, value, valuelen);
1211 // Clean up and move on.
1212 free(key); // Don't free 'value', it's actually the same buffer
1217 // Convert RFC822 references format (References) to Citadel references format (Weferences)
1218 void convert_references_to_wefewences(char *str) {
1219 int bracket_nesting = 0;
1221 char *moveptr = NULL;
1228 if (bracket_nesting < 0) bracket_nesting = 0;
1230 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
1234 else if (bracket_nesting > 0) {
1240 *moveptr = *(moveptr+1);
1244 if (ch == '<') ++bracket_nesting;
1250 // Convert an RFC822 message (headers + body) to a CtdlMessage structure.
1251 // NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
1252 // will be deallocated when CM_Free() is called. Therefore, the
1253 // supplied buffer should be DEREFERENCED. It should not be freed or used
1255 struct CtdlMessage *convert_internet_message(char *rfc822) {
1256 StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
1258 return convert_internet_message_buf(&RFCBuf);
1262 struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822)
1264 struct CtdlMessage *msg;
1265 const char *pos, *beg, *end, *totalend;
1266 int done, alldone = 0;
1268 StrBuf *OtherHeaders;
1270 msg = malloc(sizeof(struct CtdlMessage));
1271 if (msg == NULL) return msg;
1273 memset(msg, 0, sizeof(struct CtdlMessage));
1274 msg->cm_magic = CTDLMESSAGE_MAGIC; // self check
1275 msg->cm_anon_type = 0; // never anonymous
1276 msg->cm_format_type = FMT_RFC822; // internet message
1278 pos = ChrPtr(*rfc822);
1279 totalend = pos + StrLength(*rfc822);
1281 OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
1285 /* Locate beginning and end of field, keeping in mind that
1286 * some fields might be multiline
1290 while ((end < totalend) &&
1295 if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) )
1300 /* done with headers? */
1302 ( (*(pos+1)=='\n') ||
1308 if (pos >= (totalend - 1) )
1318 /* At this point we have a field. Are we interested in it? */
1319 converted = convert_field(msg, beg, end);
1321 /* Strip the field out of the RFC822 header if we used it */
1323 StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
1324 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1327 /* If we've hit the end of the message, bail out */
1328 if (pos >= totalend)
1331 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1333 StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
1335 CM_SetAsFieldSB(msg, eMesageText, &OtherHeaders);
1337 /* Follow-up sanity checks... */
1339 /* If there's no timestamp on this message, set it to now. */
1340 if (CM_IsEmpty(msg, eTimestamp)) {
1341 CM_SetFieldLONG(msg, eTimestamp, time(NULL));
1344 /* If a W (references, or rather, Wefewences) field is present, we
1345 * have to convert it from RFC822 format to Citadel format.
1347 if (!CM_IsEmpty(msg, eWeferences)) {
1349 convert_references_to_wefewences(msg->cm_fields[eWeferences]);
1357 * Look for a particular header field in an RFC822 message text. If the
1358 * requested field is found, it is unfolded (if necessary) and returned to
1359 * the caller. The field name is stripped out, leaving only its contents.
1360 * The caller is responsible for freeing the returned buffer. If the requested
1361 * field is not present, or anything else goes wrong, it returns NULL.
1363 char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
1364 char *fieldbuf = NULL;
1365 const char *end_of_headers;
1366 const char *field_start;
1371 /* Should never happen, but sometimes we get stupid */
1372 if (rfc822 == NULL) return(NULL);
1373 if (fieldname == NULL) return(NULL);
1375 snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
1377 /* Locate the end of the headers, so we don't run past that point */
1378 end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
1379 if (end_of_headers == NULL) {
1380 end_of_headers = cbmstrcasestr(rfc822, "\n\n");
1382 if (end_of_headers == NULL) return (NULL);
1384 field_start = cbmstrcasestr(rfc822, fieldhdr);
1385 if (field_start == NULL) return(NULL);
1386 if (field_start > end_of_headers) return(NULL);
1388 fieldbuf = malloc(SIZ);
1389 strcpy(fieldbuf, "");
1392 ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
1393 while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
1394 strcat(fieldbuf, " ");
1395 cont = &fieldbuf[strlen(fieldbuf)];
1396 ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
1400 strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
1407 /*****************************************************************************
1408 * DIRECTORY MANAGEMENT FUNCTIONS *
1409 *****************************************************************************/
1412 * Generate the index key for an Internet e-mail address to be looked up
1415 void directory_key(char *key, char *addr) {
1419 for (i=0; !IsEmptyStr(&addr[i]); ++i) {
1420 if (!isspace(addr[i])) {
1421 key[keylen++] = tolower(addr[i]);
1426 syslog(LOG_DEBUG, "internet_addressing: directory key is <%s>", key);
1431 * Return nonzero if the supplied address is in one of "our" domains
1433 int IsDirectory(char *addr, int allow_masq_domains) {
1437 extract_token(domain, addr, 1, '@', sizeof domain);
1440 h = CtdlHostAlias(domain);
1442 if ( (h == hostalias_masq) && allow_masq_domains)
1445 if (h == hostalias_localhost) {
1455 * Add an Internet e-mail address to the directory for a user
1457 int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
1460 if (IsDirectory(internet_addr, 0) == 0) {
1463 syslog(LOG_DEBUG, "internet_addressing: create directory entry: %s --> %s", internet_addr, citadel_addr);
1464 directory_key(key, internet_addr);
1465 cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
1471 * Delete an Internet e-mail address from the directory.
1473 * (NOTE: we don't actually use or need the citadel_addr variable; it's merely
1474 * here because the callback API expects to be able to send it.)
1476 int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
1479 syslog(LOG_DEBUG, "internet_addressing: delete directory entry: %s --> %s", internet_addr, citadel_addr);
1480 directory_key(key, internet_addr);
1481 return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
1486 * Look up an Internet e-mail address in the directory.
1487 * On success: returns 0, and Citadel address stored in 'target'
1488 * On failure: returns nonzero
1490 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
1491 struct cdbdata *cdbrec;
1494 /* Dump it in there unchanged, just for kicks */
1495 if (target != NULL) {
1496 safestrncpy(target, internet_addr, targbuflen);
1499 /* Only do lookups for addresses with hostnames in them */
1500 if (num_tokens(internet_addr, '@') != 2) return(-1);
1502 /* Only do lookups for domains in the directory */
1503 if (IsDirectory(internet_addr, 0) == 0) return(-1);
1505 directory_key(key, internet_addr);
1506 cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key) );
1507 if (cdbrec != NULL) {
1508 if (target != NULL) {
1509 safestrncpy(target, cdbrec->ptr, targbuflen);
1520 * Harvest any email addresses that someone might want to have in their
1521 * "collected addresses" book.
1523 char *harvest_collected_addresses(struct CtdlMessage *msg) {
1526 char user[256], node[256], name[256];
1529 eMsgField field = 0;
1531 if (msg == NULL) return(NULL);
1535 if (!CM_IsEmpty(msg, eAuthor)) {
1536 strcat(addr, msg->cm_fields[eAuthor]);
1538 if (!CM_IsEmpty(msg, erFc822Addr)) {
1540 strcat(addr, msg->cm_fields[erFc822Addr]);
1542 if (IsDirectory(msg->cm_fields[erFc822Addr], 0)) {
1547 if (is_harvestable) {
1548 coll = strdup(addr);
1554 if (coll == NULL) return(NULL);
1556 /* Scan both the R (To) and Y (CC) fields */
1557 for (i = 0; i < 2; ++i) {
1558 if (i == 0) field = eRecipient;
1559 if (i == 1) field = eCarbonCopY;
1561 if (!CM_IsEmpty(msg, field)) {
1562 for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
1563 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
1564 if (strstr(addr, "=?") != NULL)
1565 utf8ify_rfc822_string(addr);
1566 process_rfc822_addr(addr, user, node, name);
1567 h = CtdlHostAlias(node);
1568 if (h != hostalias_localhost) {
1569 coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1570 if (coll == NULL) return(NULL);
1571 if (!IsEmptyStr(coll)) {
1581 if (IsEmptyStr(coll)) {
1590 * Helper function for CtdlRebuildDirectoryIndex()
1592 void CtdlRebuildDirectoryIndex_backend(char *username, void *data) {
1595 struct ctdluser usbuf;
1597 if (CtdlGetUser(&usbuf, username) != 0) {
1601 if ( (!IsEmptyStr(usbuf.fullname)) && (!IsEmptyStr(usbuf.emailaddrs)) ) {
1602 for (j=0; j<num_tokens(usbuf.emailaddrs, '|'); ++j) {
1603 char one_email[512];
1604 extract_token(one_email, usbuf.emailaddrs, j, '|', sizeof one_email);
1605 CtdlDirectoryAddUser(one_email, usbuf.fullname);
1612 * Initialize the directory database (erasing anything already there)
1614 void CtdlRebuildDirectoryIndex(void) {
1615 syslog(LOG_INFO, "internet_addressing: rebuilding email address directory index");
1616 cdb_trunc(CDB_DIRECTORY);
1617 ForEachUser(CtdlRebuildDirectoryIndex_backend, NULL);
1622 * Configure Internet email addresses for a user account, updating the Directory Index in the process
1624 void CtdlSetEmailAddressesForUser(char *requested_user, char *new_emailaddrs)
1626 struct ctdluser usbuf;
1630 if (CtdlGetUserLock(&usbuf, requested_user) != 0) { // We are relying on the fact that the DirectoryIndex functions don't lock.
1631 return; // Silently fail here if we can't acquire a lock on the user record.
1634 syslog(LOG_DEBUG, "internet_addressing: setting email addresses for <%s> to <%s>", usbuf.fullname, new_emailaddrs);
1636 /* Delete all of the existing directory index records for the user (easier this way) */
1637 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1638 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1639 CtdlDirectoryDelUser(buf, requested_user);
1642 strcpy(usbuf.emailaddrs, new_emailaddrs); // make it official.
1644 /* Index all of the new email addresses (they've already been sanitized) */
1645 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1646 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1647 CtdlDirectoryAddUser(buf, requested_user);
1650 CtdlPutUserLock(&usbuf);
1655 * Auto-generate an Internet email address for a user account
1657 void AutoGenerateEmailAddressForUser(struct ctdluser *user) {
1658 char synthetic_email_addr[1024];
1662 for (i=0; u==0; ++i) {
1664 // first try just converting the user name to lowercase and replacing spaces with underscores
1665 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "%s@%s", user->fullname, CtdlGetConfigStr("c_fqdn"));
1666 for (j=0; ((synthetic_email_addr[j] != '\0')&&(synthetic_email_addr[j] != '@')); j++) {
1667 synthetic_email_addr[j] = tolower(synthetic_email_addr[j]);
1668 if (!isalnum(synthetic_email_addr[j])) {
1669 synthetic_email_addr[j] = '_';
1674 // then try 'ctdl' followed by the user number
1675 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08lx@%s", user->usernum, CtdlGetConfigStr("c_fqdn"));
1678 // oof. just keep trying other numbers until we find one
1679 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08x@%s", i, CtdlGetConfigStr("c_fqdn"));
1681 u = CtdlDirectoryLookup(NULL, synthetic_email_addr, 0);
1682 syslog(LOG_DEBUG, "user_ops: address <%s> lookup returned <%d>", synthetic_email_addr, u);
1685 CtdlSetEmailAddressesForUser(user->fullname, synthetic_email_addr);
1686 strncpy(CC->user.emailaddrs, synthetic_email_addr, sizeof(user->emailaddrs));
1687 syslog(LOG_DEBUG, "user_ops: auto-generated email address <%s> for <%s>", synthetic_email_addr, user->fullname);
1691 // Determine whether the supplied email address is subscribed to the supplied room's mailing list service.
1692 int is_email_subscribed_to_list(char *email, char *room_name) {
1693 struct ctdlroom room;
1695 char *roomnetconfig;
1698 if (CtdlGetRoom(&room, room_name)) {
1699 return(0); // room not found, so definitely not subscribed
1702 // If this room has the QR2_SMTP_PUBLIC flag set, anyone may email a post to this room, even non-subscribers.
1703 if (room.QRflags2 & QR2_SMTP_PUBLIC) {
1707 roomnum = room.QRnumber;
1708 roomnetconfig = LoadRoomNetConfigFile(roomnum);
1709 if (roomnetconfig == NULL) {
1713 // We're going to do a very sloppy match here and simply search for the specified email address
1714 // anywhere in the room's netconfig. If you don't like this, fix it yourself.
1715 if (bmstrcasestr(roomnetconfig, email)) {
1722 free(roomnetconfig);