2 * This file contains functions which handle the mapping of Internet addresses
3 * to users on the Citadel system.
5 * Copyright (c) 1987-2021 by the citadel.org team
7 * This program is open source software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 3.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
25 #include <sys/types.h>
30 #include <libcitadel.h>
33 #include "sysdep_decls.h"
34 #include "citserver.h"
38 #include "internet_addressing.h"
41 #include "parsedate.h"
43 #include "ctdl_module.h"
47 /* This is the non-define version in case it is needed for debugging */
49 inline void FindNextEnd (char *bptr, char *end)
51 /* Find the next ?Q? */
52 end = strchr(bptr + 2, '?');
53 if (end == NULL) return NULL;
54 if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) &&
55 (*(end + 2) == '?')) {
56 /* skip on to the end of the cluster, the next ?= */
57 end = strstr(end + 3, "?=");
60 /* sort of half valid encoding, try to find an end. */
61 end = strstr(bptr, "?=");
65 #define FindNextEnd(bptr, end) { \
66 end = strchr(bptr + 2, '?'); \
68 if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) && (*(end + 2) == '?')) { \
69 end = strstr(end + 3, "?="); \
70 } else end = strstr(bptr, "?="); \
75 * Handle subjects with RFC2047 encoding such as:
76 * =?koi8-r?B?78bP0s3Mxc7JxSDXz9rE1dvO2c3JINvB0sHNySDP?=
78 void utf8ify_rfc822_string(char *buf) {
79 char *start, *end, *next, *nextend, *ptr;
84 iconv_t ic = (iconv_t)(-1) ;
85 char *ibuf; // Buffer of characters to be converted
86 char *obuf; // Buffer for converted characters
87 size_t ibuflen; // Length of input buffer
88 size_t obuflen; // Length of output buffer
89 char *isav; // Saved pointer to input buffer
90 char *osav; // Saved pointer to output buffer
93 int illegal_non_rfc2047_encoding = 0;
95 /* Sometimes, badly formed messages contain strings which were simply
96 * written out directly in some foreign character set instead of
97 * using RFC2047 encoding. This is illegal but we will attempt to
98 * handle it anyway by converting from a user-specified default
99 * charset to UTF-8 if we see any nonprintable characters.
102 for (i=0; i<len; ++i) {
103 if ((buf[i] < 32) || (buf[i] > 126)) {
104 illegal_non_rfc2047_encoding = 1;
105 i = len; // take a shortcut, it won't be more than one.
108 if (illegal_non_rfc2047_encoding) {
109 const char *default_header_charset = "iso-8859-1";
110 if ( (strcasecmp(default_header_charset, "UTF-8")) && (strcasecmp(default_header_charset, "us-ascii")) ) {
111 ctdl_iconv_open("UTF-8", default_header_charset, &ic);
112 if (ic != (iconv_t)(-1) ) {
115 safestrncpy(ibuf, buf, 1024);
116 ibuflen = strlen(ibuf);
118 obuf = (char *) malloc(obuflen);
120 iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
121 osav[1024-obuflen] = 0;
130 /* pre evaluate the first pair */
131 nextend = end = NULL;
133 start = strstr(buf, "=?");
135 FindNextEnd (start, end);
137 while ((start != NULL) && (end != NULL)) {
138 next = strstr(end, "=?");
140 FindNextEnd(next, nextend);
144 /* did we find two partitions */
145 if ((next != NULL) && ((next - end) > 2)) {
147 while ((ptr < next) &&
153 /* did we find a gab just filled with blanks? */
158 len - (next - start));
160 /* now terminate the gab at the end */
161 delta = (next - end) - 2;
165 /* move next to its new location. */
170 /* our next-pair is our new first pair now. */
175 // Now we handle foreign character sets properly encoded in RFC2047 format.
176 start = strstr(buf, "=?");
177 FindNextEnd((start != NULL)? start : buf, end);
178 while (start != NULL && end != NULL && end > start) {
179 extract_token(charset, start, 1, '?', sizeof charset);
180 extract_token(encoding, start, 2, '?', sizeof encoding);
181 extract_token(istr, start, 3, '?', sizeof istr);
185 if (!strcasecmp(encoding, "B")) { // base64
186 ibuflen = CtdlDecodeBase64(ibuf, istr, strlen(istr));
188 else if (!strcasecmp(encoding, "Q")) { // quoted-printable
195 if (istr[pos] == '_') istr[pos] = ' ';
198 ibuflen = CtdlDecodeQuotedPrintable(ibuf, istr, len);
201 strcpy(ibuf, istr); // unknown encoding
202 ibuflen = strlen(istr);
205 ctdl_iconv_open("UTF-8", charset, &ic);
206 if (ic != (iconv_t)(-1) ) {
208 obuf = (char *) malloc(obuflen);
210 iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
211 osav[1024-obuflen] = 0;
216 remove_token(end, 0, '?');
217 remove_token(end, 0, '?');
218 remove_token(end, 0, '?');
219 remove_token(end, 0, '?');
220 strcpy(end, &end[1]);
222 snprintf(newbuf, sizeof newbuf, "%s%s%s", buf, osav, end);
231 remove_token(end, 0, '?');
232 remove_token(end, 0, '?');
233 remove_token(end, 0, '?');
234 remove_token(end, 0, '?');
235 strcpy(end, &end[1]);
237 snprintf(newbuf, sizeof newbuf, "%s(unreadable)%s", buf, end);
244 * Since spammers will go to all sorts of absurd lengths to get their
245 * messages through, there are LOTS of corrupt headers out there.
246 * So, prevent a really badly formed RFC2047 header from throwing
247 * this function into an infinite loop.
250 if (passes > 20) return;
252 start = strstr(buf, "=?");
253 FindNextEnd((start != NULL)? start : buf, end);
258 inline void utf8ify_rfc822_string(char *a){};
263 char *inetcfg = NULL;
266 * Return nonzero if the supplied name is an alias for this host.
268 int CtdlHostAlias(char *fqdn) {
272 char host[256], type[256];
275 if (fqdn == NULL) return(hostalias_nomatch);
276 if (IsEmptyStr(fqdn)) return(hostalias_nomatch);
277 if (!strcasecmp(fqdn, "localhost")) return(hostalias_localhost);
278 if (!strcasecmp(fqdn, CtdlGetConfigStr("c_fqdn"))) return(hostalias_localhost);
279 if (!strcasecmp(fqdn, CtdlGetConfigStr("c_nodename"))) return(hostalias_localhost);
280 if (inetcfg == NULL) return(hostalias_nomatch);
282 config_lines = num_tokens(inetcfg, '\n');
283 for (i=0; i<config_lines; ++i) {
284 extract_token(buf, inetcfg, i, '\n', sizeof buf);
285 extract_token(host, buf, 0, '|', sizeof host);
286 extract_token(type, buf, 1, '|', sizeof type);
290 /* Process these in a specific order, in case there are multiple matches.
291 * We want localhost to override masq, for example.
294 if ( (!strcasecmp(type, "masqdomain")) && (!strcasecmp(fqdn, host))) {
295 found = hostalias_masq;
298 if ( (!strcasecmp(type, "localhost")) && (!strcasecmp(fqdn, host))) {
299 found = hostalias_localhost;
302 // "directory" used to be a distributed version of "localhost" but they're both the same now
303 if ( (!strcasecmp(type, "directory")) && (!strcasecmp(fqdn, host))) {
304 found = hostalias_localhost;
307 if (found) return(found);
309 return(hostalias_nomatch);
314 * Determine whether a given Internet address belongs to the current user
316 int CtdlIsMe(char *addr, int addr_buf_len) {
317 struct recptypes *recp;
320 recp = validate_recipients(addr, NULL, 0);
321 if (recp == NULL) return(0);
323 if (recp->num_local == 0) {
324 free_recipients(recp);
328 for (i=0; i<recp->num_local; ++i) {
329 extract_token(addr, recp->recp_local, i, '|', addr_buf_len);
330 if (!strcasecmp(addr, CC->user.fullname)) {
331 free_recipients(recp);
336 free_recipients(recp);
341 /* If the last item in a list of recipients was truncated to a partial address,
342 * remove it completely in order to avoid choking library functions.
344 void sanitize_truncated_recipient(char *str)
347 if (num_tokens(str, ',') < 2) return;
349 int len = strlen(str);
350 if (len < 900) return;
351 if (len > 998) str[998] = 0;
353 char *cptr = strrchr(str, ',');
356 char *lptr = strchr(cptr, '<');
357 char *rptr = strchr(cptr, '>');
359 if ( (lptr) && (rptr) && (rptr > lptr) ) return;
366 * This function is self explanatory.
367 * (What can I say, I'm in a weird mood today...)
369 void remove_any_whitespace_to_the_left_or_right_of_at_symbol(char *name) {
373 for (ptr=name; *ptr; ++ptr) {
374 while ( (isspace(*ptr)) && (*(ptr+1)=='@') ) {
376 if (ptr > name) --ptr;
378 while ( (*ptr=='@') && (*(ptr+1)!=0) && (isspace(*(ptr+1))) ) {
379 strcpy(ptr+1, ptr+2);
385 // values that can be returned by expand_aliases()
387 EA_ERROR, // Can't send message due to bad address
388 EA_MULTIPLE, // Alias expanded into multiple recipients -- run me again!
389 EA_LOCAL, // Local message, do no network processing
390 EA_INTERNET // Convert msg and send as Internet mail
394 // Process alias and routing info for email addresses
395 int expand_aliases(char *name, char *aliases) {
401 int num_aliases = num_tokens(aliases, '\n');
402 for (a=0; a<num_aliases; ++a) {
403 extract_token(aaa, aliases, a, '\n', sizeof aaa);
404 char *bar = strchr(aaa, '|');
410 if ( (!IsEmptyStr(aaa)) && (!strcasecmp(name, aaa)) ) {
411 syslog(LOG_DEBUG, "internet_addressing: global alias <%s> to <%s>", name, bar);
416 if (strchr(name, ',')) {
421 char original_name[256]; // Now go for the regular aliases
422 safestrncpy(original_name, name, sizeof original_name);
424 // should these checks still be here, or maybe move them to split_recps() ?
426 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
427 stripallbut(name, '<', '>');
429 /* Hit the email address directory */
430 if (CtdlDirectoryLookup(aaa, name, sizeof aaa) == 0) {
434 if (strcasecmp(original_name, name)) {
435 syslog(LOG_INFO, "internet_addressing: directory alias <%s> to <%s>", original_name, name);
438 /* Change "user @ xxx" to "user" if xxx is an alias for this host */
439 for (a=0; name[a] != '\0'; ++a) {
440 if (name[a] == '@') {
441 if (CtdlHostAlias(&name[a+1]) == hostalias_localhost) {
443 syslog(LOG_DEBUG, "internet_addressing: host is local, recipient is <%s>", name);
449 /* Is this a local or remote recipient? */
450 at = haschar(name, '@');
452 return(EA_LOCAL); /* no @'s = local address */
455 return(EA_INTERNET); /* one @ = internet address */
458 return(EA_ERROR); /* more than one @ = badly formed address */
463 // Return a supplied list of email addresses as an array, removing superfluous information and syntax.
464 // If an existing Array is supplied as "append_to" it will do so; otherwise a new Array is allocated.
465 Array *split_recps(char *addresses, Array *append_to) {
467 if (IsEmptyStr(addresses)) { // nothing supplied, nothing returned
471 // Copy the supplied address list into our own memory space, because we are going to modify it.
472 char *a = strdup(addresses);
474 syslog(LOG_ERR, "internet_addressing: malloc() failed: %m");
478 // Strip out anything in double quotes
483 r = strrchr(a, '\"');
489 // Transform all qualifying delimiters to commas
490 for (char *t=a; t[0]; ++t) {
491 if ((t[0]==';') || (t[0]=='|')) {
496 // Tokenize the recipients into an array. No single recipient should be larger than 256 bytes.
497 Array *recipients_array = NULL;
499 recipients_array = append_to; // Append to an existing array of recipients
502 recipients_array = array_new(256); // This is a new array of recipients
505 int num_addresses = num_tokens(a, ',');
506 for (int i=0; i<num_addresses; ++i) {
507 char this_address[256];
508 extract_token(this_address, a, i, ',', sizeof this_address);
509 striplt(this_address); // strip leading and trailing whitespace
510 stripout(this_address, '(', ')'); // remove any portion in parentheses
511 stripallbut(this_address, '<', '>'); // if angle brackets are present, keep only what is inside them
512 if (!IsEmptyStr(this_address)) {
513 array_append(recipients_array, this_address);
517 free(a); // We don't need this buffer anymore.
518 return(recipients_array); // Return the completed array to the caller.
522 // Validate recipients, count delivery types and errors, and handle aliasing
523 // FIXME check for dupes!!!!!
525 // Returns 0 if all addresses are ok, ret->num_error = -1 if no addresses
526 // were specified, or the number of addresses found invalid.
528 // Caller needs to free the result using free_recipients()
530 struct recptypes *validate_recipients(char *supplied_recipients, const char *RemoteIdentifier, int Flags) {
531 struct recptypes *ret;
532 char *recipients = NULL;
537 struct ctdluser tempUS;
538 struct ctdlroom original_room;
544 ret = (struct recptypes *) malloc(sizeof(struct recptypes)); // Initialize
545 if (ret == NULL) return(NULL);
546 memset(ret, 0, sizeof(struct recptypes)); // set all values to null/zero
548 if (supplied_recipients == NULL) {
549 recipients = strdup("");
552 recipients = strdup(supplied_recipients);
555 len = strlen(recipients) + 1024; // allocate memory
556 ret->errormsg = malloc(len);
557 ret->recp_local = malloc(len);
558 ret->recp_internet = malloc(len);
559 ret->recp_room = malloc(len);
560 ret->display_recp = malloc(len);
561 ret->recp_orgroom = malloc(len);
563 ret->errormsg[0] = 0;
564 ret->recp_local[0] = 0;
565 ret->recp_internet[0] = 0;
566 ret->recp_room[0] = 0;
567 ret->recp_orgroom[0] = 0;
568 ret->display_recp[0] = 0;
569 ret->recptypes_magic = RECPTYPES_MAGIC;
571 Array *recp_array = split_recps(supplied_recipients, NULL);
573 char *aliases = CtdlGetSysConfig(GLOBAL_ALIASES); // First hit the Global Alias Table
575 for (int r=0; (recp_array && r<array_len(recp_array)); ++r) {
576 org_recp = (char *)array_get_element_at(recp_array, r);
577 strncpy(this_recp, org_recp, sizeof this_recp);
579 for (int i=0; i<3; ++i) { // pass three times through the aliaser
580 mailtype = expand_aliases(this_recp, aliases);
581 syslog(LOG_DEBUG, "Recipient #%d of type %d is <%s>", r, mailtype, this_recp);
583 // If an alias expanded to multiple recipients, strip off those recipients and append them
584 // to the end of the array. This loop will hit those again when it gets there.
585 if (mailtype == EA_MULTIPLE) {
586 recp_array = split_recps(this_recp, recp_array);
593 case EA_LOCAL: // There are several types of "local" recipients.
595 // Old BBS conventions require mail to "sysop" to go somewhere. Send it to the admin room.
596 if (!strcasecmp(this_recp, "sysop")) {
598 strcpy(this_recp, CtdlGetConfigStr("c_aideroom"));
599 if (!IsEmptyStr(ret->recp_room)) {
600 strcat(ret->recp_room, "|");
602 strcat(ret->recp_room, this_recp);
605 // This handles rooms which can receive posts via email.
606 else if (!strncasecmp(this_recp, "room_", 5)) {
607 original_room = CC->room; // Remember where we parked
609 char mail_to_room[ROOMNAMELEN];
611 strncpy(mail_to_room, &this_recp[5], sizeof mail_to_room);
612 for (m = mail_to_room; *m; ++m) {
613 if (m[0] == '_') m[0]=' ';
615 if (!CtdlGetRoom(&CC->room, mail_to_room)) { // Find the room they asked for
617 err = CtdlDoIHavePermissionToPostInThisRoom( // check for write permissions to room
622 0 // 0 means "this is not a reply"
630 if (!IsEmptyStr(ret->recp_room)) {
631 strcat(ret->recp_room, "|");
633 strcat(ret->recp_room, &this_recp[5]);
635 if (!IsEmptyStr(ret->recp_orgroom)) {
636 strcat(ret->recp_orgroom, "|");
638 strcat(ret->recp_orgroom, org_recp);
642 else { // no such room exists
647 // Restore this session's original room location.
648 CC->room = original_room;
652 // This handles the most common case, which is mail to a user's inbox.
653 else if (CtdlGetUser(&tempUS, this_recp) == 0) {
655 strcpy(this_recp, tempUS.fullname);
656 if (!IsEmptyStr(ret->recp_local)) {
657 strcat(ret->recp_local, "|");
659 strcat(ret->recp_local, this_recp);
662 // No match for this recipient
669 // Yes, you're reading this correctly: if the target domain points back to the local system,
670 // the address is invalid. That's because if the address were valid, we would have
671 // already translated it to a local address by now.
672 if (IsDirectory(this_recp, 0)) {
678 if (!IsEmptyStr(ret->recp_internet)) {
679 strcat(ret->recp_internet, "|");
681 strcat(ret->recp_internet, this_recp);
685 // just skip the multiple here because we've already expanded it
693 if (IsEmptyStr(errmsg)) {
694 snprintf(append, sizeof append, "Invalid recipient: %s", this_recp);
697 snprintf(append, sizeof append, "%s", errmsg);
699 if ( (strlen(ret->errormsg) + strlen(append) + 3) < SIZ) {
700 if (!IsEmptyStr(ret->errormsg)) {
701 strcat(ret->errormsg, "; ");
703 strcat(ret->errormsg, append);
707 if (IsEmptyStr(ret->display_recp)) {
708 strcpy(append, this_recp);
711 snprintf(append, sizeof append, ", %s", this_recp);
713 if ( (strlen(ret->display_recp)+strlen(append)) < SIZ) {
714 strcat(ret->display_recp, append);
719 if (aliases != NULL) { // ok, we're done with the global alias list now
723 if ( (ret->num_local + ret->num_internet + ret->num_room + ret->num_error) == 0) {
724 ret->num_error = (-1);
725 strcpy(ret->errormsg, "No recipients specified.");
728 syslog(LOG_DEBUG, "internet_addressing: validate_recipients() = %d local, %d room, %d SMTP, %d error",
729 ret->num_local, ret->num_room, ret->num_internet, ret->num_error
734 array_free(recp_array);
742 * Destructor for recptypes
744 void free_recipients(struct recptypes *valid) {
750 if (valid->recptypes_magic != RECPTYPES_MAGIC) {
751 syslog(LOG_ERR, "internet_addressing: attempt to call free_recipients() on some other data type!");
755 if (valid->errormsg != NULL) free(valid->errormsg);
756 if (valid->recp_local != NULL) free(valid->recp_local);
757 if (valid->recp_internet != NULL) free(valid->recp_internet);
758 if (valid->recp_room != NULL) free(valid->recp_room);
759 if (valid->recp_orgroom != NULL) free(valid->recp_orgroom);
760 if (valid->display_recp != NULL) free(valid->display_recp);
761 if (valid->bounce_to != NULL) free(valid->bounce_to);
762 if (valid->envelope_from != NULL) free(valid->envelope_from);
763 if (valid->sending_room != NULL) free(valid->sending_room);
768 char *qp_encode_email_addrs(char *source) {
769 char *user, *node, *name;
770 const char headerStr[] = "=?UTF-8?Q?";
774 int need_to_encode = 0;
780 long nAddrPtrMax = 50;
785 if (source == NULL) return source;
786 if (IsEmptyStr(source)) return source;
787 syslog(LOG_DEBUG, "internet_addressing: qp_encode_email_addrs <%s>", source);
789 AddrPtr = malloc (sizeof (long) * nAddrPtrMax);
790 AddrUtf8 = malloc (sizeof (long) * nAddrPtrMax);
791 memset(AddrUtf8, 0, sizeof (long) * nAddrPtrMax);
794 while (!IsEmptyStr (&source[i])) {
795 if (nColons >= nAddrPtrMax){
798 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
799 memcpy (ptr, AddrPtr, sizeof (long) * nAddrPtrMax);
800 free (AddrPtr), AddrPtr = ptr;
802 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
803 memset(&ptr[nAddrPtrMax], 0, sizeof (long) * nAddrPtrMax);
805 memcpy (ptr, AddrUtf8, sizeof (long) * nAddrPtrMax);
806 free (AddrUtf8), AddrUtf8 = ptr;
809 if (((unsigned char) source[i] < 32) || ((unsigned char) source[i] > 126)) {
811 AddrUtf8[nColons] = 1;
813 if (source[i] == '"') {
814 InQuotes = !InQuotes;
816 if (!InQuotes && source[i] == ',') {
817 AddrPtr[nColons] = i;
822 if (need_to_encode == 0) {
829 EncodedMaxLen = nColons * (sizeof(headerStr) + 3) + SourceLen * 3;
830 Encoded = (char*) malloc (EncodedMaxLen);
832 for (i = 0; i < nColons; i++) {
833 source[AddrPtr[i]++] = '\0';
835 /* TODO: if libidn, this might get larger*/
836 user = malloc(SourceLen + 1);
837 node = malloc(SourceLen + 1);
838 name = malloc(SourceLen + 1);
842 for (i = 0; i < nColons && nPtr != NULL; i++) {
843 nmax = EncodedMaxLen - (nPtr - Encoded);
845 process_rfc822_addr(&source[AddrPtr[i]], user, node, name);
846 /* TODO: libIDN here ! */
847 if (IsEmptyStr(name)) {
848 n = snprintf(nPtr, nmax, (i==0)?"%s@%s" : ",%s@%s", user, node);
851 EncodedName = rfc2047encode(name, strlen(name));
852 n = snprintf(nPtr, nmax, (i==0)?"%s <%s@%s>" : ",%s <%s@%s>", EncodedName, user, node);
857 n = snprintf(nPtr, nmax, (i==0)?"%s" : ",%s", &source[AddrPtr[i]]);
863 ptr = (char*) malloc(EncodedMaxLen * 2);
864 memcpy(ptr, Encoded, EncodedMaxLen);
865 nnPtr = ptr + (nPtr - Encoded), nPtr = nnPtr;
866 free(Encoded), Encoded = ptr;
868 i--; /* do it once more with properly lengthened buffer */
871 for (i = 0; i < nColons; i++)
872 source[--AddrPtr[i]] = ',';
884 * Unfold a multi-line field into a single line, removing multi-whitespaces
886 void unfold_rfc822_field(char **field, char **FieldEnd)
889 char *pField = *field;
891 char *pFieldEnd = *FieldEnd;
893 while (isspace(*pField))
895 /* remove leading/trailing whitespace */
898 while (isspace(*pFieldEnd))
901 *FieldEnd = pFieldEnd;
902 /* convert non-space whitespace to spaces, and remove double blanks */
903 for (sField = *field = pField;
907 if ((*sField=='\r') || (*sField=='\n'))
910 while ( ( (*(sField + offset) == '\r') || (*(sField + offset) == '\n' )) && (sField + offset < pFieldEnd) ) {
917 if (*sField=='\"') quote = 1 - quote;
919 if (isspace(*sField)) {
924 while ((sField < pFieldEnd) &&
929 else *pField = *sField;
931 else *pField = *sField;
935 *FieldEnd = pField - 1;
940 * Split an RFC822-style address into userid, host, and full name
943 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name) {
947 strcpy(node, CtdlGetConfigStr("c_fqdn"));
950 if (rfc822 == NULL) return;
952 /* extract full name - first, it's From minus <userid> */
953 strcpy(name, rfc822);
954 stripout(name, '<', '>');
956 /* strip anything to the left of a bang */
957 while ((!IsEmptyStr(name)) && (haschar(name, '!') > 0))
958 strcpy(name, &name[1]);
960 /* and anything to the right of a @ or % */
961 for (a = 0; name[a] != '\0'; ++a) {
962 if (name[a] == '@') {
966 if (name[a] == '%') {
972 /* but if there are parentheses, that changes the rules... */
973 if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
974 strcpy(name, rfc822);
975 stripallbut(name, '(', ')');
978 /* but if there are a set of quotes, that supersedes everything */
979 if (haschar(rfc822, 34) == 2) {
980 strcpy(name, rfc822);
981 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
982 strcpy(&name[0], &name[1]);
984 strcpy(&name[0], &name[1]);
985 for (a = 0; name[a] != '\0'; ++a)
991 /* extract user id */
992 strcpy(user, rfc822);
994 /* first get rid of anything in parens */
995 stripout(user, '(', ')');
997 /* if there's a set of angle brackets, strip it down to that */
998 if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
999 stripallbut(user, '<', '>');
1002 /* strip anything to the left of a bang */
1003 while ((!IsEmptyStr(user)) && (haschar(user, '!') > 0))
1004 strcpy(user, &user[1]);
1006 /* and anything to the right of a @ or % */
1007 for (a = 0; user[a] != '\0'; ++a) {
1008 if (user[a] == '@') {
1012 if (user[a] == '%') {
1019 /* extract node name */
1020 strcpy(node, rfc822);
1022 /* first get rid of anything in parens */
1023 stripout(node, '(', ')');
1025 /* if there's a set of angle brackets, strip it down to that */
1026 if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
1027 stripallbut(node, '<', '>');
1030 /* If no node specified, tack ours on instead */
1032 (haschar(node, '@')==0)
1033 && (haschar(node, '%')==0)
1034 && (haschar(node, '!')==0)
1036 strcpy(node, CtdlGetConfigStr("c_nodename"));
1040 /* strip anything to the left of a @ */
1041 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0))
1042 strcpy(node, &node[1]);
1044 /* strip anything to the left of a % */
1045 while ((!IsEmptyStr(node)) && (haschar(node, '%') > 0))
1046 strcpy(node, &node[1]);
1048 /* reduce multiple system bang paths to node!user */
1049 while ((!IsEmptyStr(node)) && (haschar(node, '!') > 1))
1050 strcpy(node, &node[1]);
1052 /* now get rid of the user portion of a node!user string */
1053 for (a = 0; node[a] != '\0'; ++a)
1054 if (node[a] == '!') {
1060 /* strip leading and trailing spaces in all strings */
1065 /* If we processed a string that had the address in angle brackets
1066 * but no name outside the brackets, we now have an empty name. In
1067 * this case, use the user portion of the address as the name.
1069 if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
1076 * convert_field() is a helper function for convert_internet_message().
1077 * Given start/end positions for an rfc822 field, it converts it to a Citadel
1078 * field if it wants to, and unfolds it if necessary.
1080 * Returns 1 if the field was converted and inserted into the Citadel message
1081 * structure, implying that the source field should be removed from the
1084 int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
1085 char *key, *value, *valueend;
1089 const char *colonpos = NULL;
1098 for (pos = end; pos >= beg; pos--) {
1099 if (*pos == ':') colonpos = pos;
1102 if (colonpos == NULL) return(0); /* no colon? not a valid header line */
1105 key = malloc(len + 2);
1106 memcpy(key, beg, len + 1);
1108 valueend = key + len;
1109 * ( key + (colonpos - beg) ) = '\0';
1110 value = &key[(colonpos - beg) + 1];
1111 /* printf("Header: [%s]\nValue: [%s]\n", key, value); */
1112 unfold_rfc822_field(&value, &valueend);
1113 valuelen = valueend - value + 1;
1114 /* printf("UnfoldedValue: [%s]\n", value); */
1117 * Here's the big rfc822-to-citadel loop.
1120 /* Date/time is converted into a unix timestamp. If the conversion
1121 * fails, we replace it with the time the message arrived locally.
1123 if (!strcasecmp(key, "Date")) {
1124 parsed_date = parsedate(value);
1125 if (parsed_date < 0L) parsed_date = time(NULL);
1127 if (CM_IsEmpty(msg, eTimestamp))
1128 CM_SetFieldLONG(msg, eTimestamp, parsed_date);
1132 else if (!strcasecmp(key, "From")) {
1133 process_rfc822_addr(value, user, node, name);
1134 syslog(LOG_DEBUG, "internet_addressing: converted to <%s@%s> (%s)", user, node, name);
1135 snprintf(addr, sizeof(addr), "%s@%s", user, node);
1136 if (CM_IsEmpty(msg, eAuthor) && !IsEmptyStr(name)) {
1137 CM_SetField(msg, eAuthor, name, -1);
1139 if (CM_IsEmpty(msg, erFc822Addr) && !IsEmptyStr(addr)) {
1140 CM_SetField(msg, erFc822Addr, addr, -1);
1145 else if (!strcasecmp(key, "Subject")) {
1146 if (CM_IsEmpty(msg, eMsgSubject))
1147 CM_SetField(msg, eMsgSubject, value, valuelen);
1151 else if (!strcasecmp(key, "List-ID")) {
1152 if (CM_IsEmpty(msg, eListID))
1153 CM_SetField(msg, eListID, value, valuelen);
1157 else if (!strcasecmp(key, "To")) {
1158 if (CM_IsEmpty(msg, eRecipient))
1159 CM_SetField(msg, eRecipient, value, valuelen);
1163 else if (!strcasecmp(key, "CC")) {
1164 if (CM_IsEmpty(msg, eCarbonCopY))
1165 CM_SetField(msg, eCarbonCopY, value, valuelen);
1169 else if (!strcasecmp(key, "Message-ID")) {
1170 if (!CM_IsEmpty(msg, emessageId)) {
1171 syslog(LOG_WARNING, "internet_addressing: duplicate message id");
1178 pValueLen = valuelen;
1179 /* Strip angle brackets */
1180 while (haschar(pValue, '<') > 0) {
1185 for (i = 0; i <= pValueLen; ++i)
1186 if (pValue[i] == '>') {
1191 CM_SetField(msg, emessageId, pValue, pValueLen);
1197 else if (!strcasecmp(key, "Return-Path")) {
1198 if (CM_IsEmpty(msg, eMessagePath))
1199 CM_SetField(msg, eMessagePath, value, valuelen);
1203 else if (!strcasecmp(key, "Envelope-To")) {
1204 if (CM_IsEmpty(msg, eenVelopeTo))
1205 CM_SetField(msg, eenVelopeTo, value, valuelen);
1209 else if (!strcasecmp(key, "References")) {
1210 CM_SetField(msg, eWeferences, value, valuelen);
1214 else if (!strcasecmp(key, "Reply-To")) {
1215 CM_SetField(msg, eReplyTo, value, valuelen);
1219 else if (!strcasecmp(key, "In-reply-to")) {
1220 if (CM_IsEmpty(msg, eWeferences)) /* References: supersedes In-reply-to: */
1221 CM_SetField(msg, eWeferences, value, valuelen);
1227 /* Clean up and move on. */
1228 free(key); /* Don't free 'value', it's actually the same buffer */
1234 * Convert RFC822 references format (References) to Citadel references format (Weferences)
1236 void convert_references_to_wefewences(char *str) {
1237 int bracket_nesting = 0;
1239 char *moveptr = NULL;
1246 if (bracket_nesting < 0) bracket_nesting = 0;
1248 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
1252 else if (bracket_nesting > 0) {
1258 *moveptr = *(moveptr+1);
1262 if (ch == '<') ++bracket_nesting;
1269 * Convert an RFC822 message (headers + body) to a CtdlMessage structure.
1270 * NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
1271 * will be deallocated when CM_Free() is called. Therefore, the
1272 * supplied buffer should be DEREFERENCED. It should not be freed or used
1275 struct CtdlMessage *convert_internet_message(char *rfc822) {
1276 StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
1278 return convert_internet_message_buf(&RFCBuf);
1282 struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822)
1284 struct CtdlMessage *msg;
1285 const char *pos, *beg, *end, *totalend;
1286 int done, alldone = 0;
1288 StrBuf *OtherHeaders;
1290 msg = malloc(sizeof(struct CtdlMessage));
1291 if (msg == NULL) return msg;
1293 memset(msg, 0, sizeof(struct CtdlMessage));
1294 msg->cm_magic = CTDLMESSAGE_MAGIC; /* self check */
1295 msg->cm_anon_type = 0; /* never anonymous */
1296 msg->cm_format_type = FMT_RFC822; /* internet message */
1298 pos = ChrPtr(*rfc822);
1299 totalend = pos + StrLength(*rfc822);
1301 OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
1305 /* Locate beginning and end of field, keeping in mind that
1306 * some fields might be multiline
1310 while ((end < totalend) &&
1315 if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) )
1320 /* done with headers? */
1322 ( (*(pos+1)=='\n') ||
1328 if (pos >= (totalend - 1) )
1338 /* At this point we have a field. Are we interested in it? */
1339 converted = convert_field(msg, beg, end);
1341 /* Strip the field out of the RFC822 header if we used it */
1343 StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
1344 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1347 /* If we've hit the end of the message, bail out */
1348 if (pos >= totalend)
1351 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1353 StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
1355 CM_SetAsFieldSB(msg, eMesageText, &OtherHeaders);
1357 /* Follow-up sanity checks... */
1359 /* If there's no timestamp on this message, set it to now. */
1360 if (CM_IsEmpty(msg, eTimestamp)) {
1361 CM_SetFieldLONG(msg, eTimestamp, time(NULL));
1364 /* If a W (references, or rather, Wefewences) field is present, we
1365 * have to convert it from RFC822 format to Citadel format.
1367 if (!CM_IsEmpty(msg, eWeferences)) {
1369 convert_references_to_wefewences(msg->cm_fields[eWeferences]);
1377 * Look for a particular header field in an RFC822 message text. If the
1378 * requested field is found, it is unfolded (if necessary) and returned to
1379 * the caller. The field name is stripped out, leaving only its contents.
1380 * The caller is responsible for freeing the returned buffer. If the requested
1381 * field is not present, or anything else goes wrong, it returns NULL.
1383 char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
1384 char *fieldbuf = NULL;
1385 const char *end_of_headers;
1386 const char *field_start;
1391 /* Should never happen, but sometimes we get stupid */
1392 if (rfc822 == NULL) return(NULL);
1393 if (fieldname == NULL) return(NULL);
1395 snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
1397 /* Locate the end of the headers, so we don't run past that point */
1398 end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
1399 if (end_of_headers == NULL) {
1400 end_of_headers = cbmstrcasestr(rfc822, "\n\n");
1402 if (end_of_headers == NULL) return (NULL);
1404 field_start = cbmstrcasestr(rfc822, fieldhdr);
1405 if (field_start == NULL) return(NULL);
1406 if (field_start > end_of_headers) return(NULL);
1408 fieldbuf = malloc(SIZ);
1409 strcpy(fieldbuf, "");
1412 ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
1413 while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
1414 strcat(fieldbuf, " ");
1415 cont = &fieldbuf[strlen(fieldbuf)];
1416 ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
1420 strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
1427 /*****************************************************************************
1428 * DIRECTORY MANAGEMENT FUNCTIONS *
1429 *****************************************************************************/
1432 * Generate the index key for an Internet e-mail address to be looked up
1435 void directory_key(char *key, char *addr) {
1439 for (i=0; !IsEmptyStr(&addr[i]); ++i) {
1440 if (!isspace(addr[i])) {
1441 key[keylen++] = tolower(addr[i]);
1446 syslog(LOG_DEBUG, "internet_addressing: directory key is <%s>", key);
1451 * Return nonzero if the supplied address is in one of "our" domains
1453 int IsDirectory(char *addr, int allow_masq_domains) {
1457 extract_token(domain, addr, 1, '@', sizeof domain);
1460 h = CtdlHostAlias(domain);
1462 if ( (h == hostalias_masq) && allow_masq_domains)
1465 if (h == hostalias_localhost) {
1475 * Add an Internet e-mail address to the directory for a user
1477 int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
1480 if (IsDirectory(internet_addr, 0) == 0) {
1483 syslog(LOG_DEBUG, "internet_addressing: create directory entry: %s --> %s", internet_addr, citadel_addr);
1484 directory_key(key, internet_addr);
1485 cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
1491 * Delete an Internet e-mail address from the directory.
1493 * (NOTE: we don't actually use or need the citadel_addr variable; it's merely
1494 * here because the callback API expects to be able to send it.)
1496 int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
1499 syslog(LOG_DEBUG, "internet_addressing: delete directory entry: %s --> %s", internet_addr, citadel_addr);
1500 directory_key(key, internet_addr);
1501 return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
1506 * Look up an Internet e-mail address in the directory.
1507 * On success: returns 0, and Citadel address stored in 'target'
1508 * On failure: returns nonzero
1510 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
1511 struct cdbdata *cdbrec;
1514 /* Dump it in there unchanged, just for kicks */
1515 if (target != NULL) {
1516 safestrncpy(target, internet_addr, targbuflen);
1519 /* Only do lookups for addresses with hostnames in them */
1520 if (num_tokens(internet_addr, '@') != 2) return(-1);
1522 /* Only do lookups for domains in the directory */
1523 if (IsDirectory(internet_addr, 0) == 0) return(-1);
1525 directory_key(key, internet_addr);
1526 cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key) );
1527 if (cdbrec != NULL) {
1528 if (target != NULL) {
1529 safestrncpy(target, cdbrec->ptr, targbuflen);
1540 * Harvest any email addresses that someone might want to have in their
1541 * "collected addresses" book.
1543 char *harvest_collected_addresses(struct CtdlMessage *msg) {
1546 char user[256], node[256], name[256];
1549 eMsgField field = 0;
1551 if (msg == NULL) return(NULL);
1555 if (!CM_IsEmpty(msg, eAuthor)) {
1556 strcat(addr, msg->cm_fields[eAuthor]);
1558 if (!CM_IsEmpty(msg, erFc822Addr)) {
1560 strcat(addr, msg->cm_fields[erFc822Addr]);
1562 if (IsDirectory(msg->cm_fields[erFc822Addr], 0)) {
1567 if (is_harvestable) {
1568 coll = strdup(addr);
1574 if (coll == NULL) return(NULL);
1576 /* Scan both the R (To) and Y (CC) fields */
1577 for (i = 0; i < 2; ++i) {
1578 if (i == 0) field = eRecipient;
1579 if (i == 1) field = eCarbonCopY;
1581 if (!CM_IsEmpty(msg, field)) {
1582 for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
1583 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
1584 if (strstr(addr, "=?") != NULL)
1585 utf8ify_rfc822_string(addr);
1586 process_rfc822_addr(addr, user, node, name);
1587 h = CtdlHostAlias(node);
1588 if (h != hostalias_localhost) {
1589 coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1590 if (coll == NULL) return(NULL);
1591 if (!IsEmptyStr(coll)) {
1601 if (IsEmptyStr(coll)) {
1610 * Helper function for CtdlRebuildDirectoryIndex()
1612 void CtdlRebuildDirectoryIndex_backend(char *username, void *data) {
1615 struct ctdluser usbuf;
1617 if (CtdlGetUser(&usbuf, username) != 0) {
1621 if ( (!IsEmptyStr(usbuf.fullname)) && (!IsEmptyStr(usbuf.emailaddrs)) ) {
1622 for (j=0; j<num_tokens(usbuf.emailaddrs, '|'); ++j) {
1623 char one_email[512];
1624 extract_token(one_email, usbuf.emailaddrs, j, '|', sizeof one_email);
1625 CtdlDirectoryAddUser(one_email, usbuf.fullname);
1632 * Initialize the directory database (erasing anything already there)
1634 void CtdlRebuildDirectoryIndex(void) {
1635 syslog(LOG_INFO, "internet_addressing: rebuilding email address directory index");
1636 cdb_trunc(CDB_DIRECTORY);
1637 ForEachUser(CtdlRebuildDirectoryIndex_backend, NULL);
1642 * Configure Internet email addresses for a user account, updating the Directory Index in the process
1644 void CtdlSetEmailAddressesForUser(char *requested_user, char *new_emailaddrs)
1646 struct ctdluser usbuf;
1650 if (CtdlGetUserLock(&usbuf, requested_user) != 0) { // We are relying on the fact that the DirectoryIndex functions don't lock.
1651 return; // Silently fail here if we can't acquire a lock on the user record.
1654 syslog(LOG_DEBUG, "internet_addressing: setting email addresses for <%s> to <%s>", usbuf.fullname, new_emailaddrs);
1656 /* Delete all of the existing directory index records for the user (easier this way) */
1657 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1658 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1659 CtdlDirectoryDelUser(buf, requested_user);
1662 strcpy(usbuf.emailaddrs, new_emailaddrs); // make it official.
1664 /* Index all of the new email addresses (they've already been sanitized) */
1665 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1666 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1667 CtdlDirectoryAddUser(buf, requested_user);
1670 CtdlPutUserLock(&usbuf);
1675 * Auto-generate an Internet email address for a user account
1677 void AutoGenerateEmailAddressForUser(struct ctdluser *user)
1679 char synthetic_email_addr[1024];
1683 for (i=0; u==0; ++i) {
1685 // first try just converting the user name to lowercase and replacing spaces with underscores
1686 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "%s@%s", user->fullname, CtdlGetConfigStr("c_fqdn"));
1687 for (j=0; ((synthetic_email_addr[j] != '\0')&&(synthetic_email_addr[j] != '@')); j++) {
1688 synthetic_email_addr[j] = tolower(synthetic_email_addr[j]);
1689 if (!isalnum(synthetic_email_addr[j])) {
1690 synthetic_email_addr[j] = '_';
1695 // then try 'ctdl' followed by the user number
1696 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08lx@%s", user->usernum, CtdlGetConfigStr("c_fqdn"));
1699 // oof. just keep trying other numbers until we find one
1700 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08x@%s", i, CtdlGetConfigStr("c_fqdn"));
1702 u = CtdlDirectoryLookup(NULL, synthetic_email_addr, 0);
1703 syslog(LOG_DEBUG, "user_ops: address <%s> lookup returned <%d>", synthetic_email_addr, u);
1706 CtdlSetEmailAddressesForUser(user->fullname, synthetic_email_addr);
1707 strncpy(CC->user.emailaddrs, synthetic_email_addr, sizeof(user->emailaddrs));
1708 syslog(LOG_DEBUG, "user_ops: auto-generated email address <%s> for <%s>", synthetic_email_addr, user->fullname);