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"
48 /* 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)
318 struct recptypes *recp;
321 recp = validate_recipients(addr, NULL, 0);
322 if (recp == NULL) return(0);
324 if (recp->num_local == 0) {
325 free_recipients(recp);
329 for (i=0; i<recp->num_local; ++i) {
330 extract_token(addr, recp->recp_local, i, '|', addr_buf_len);
331 if (!strcasecmp(addr, CC->user.fullname)) {
332 free_recipients(recp);
337 free_recipients(recp);
342 /* If the last item in a list of recipients was truncated to a partial address,
343 * remove it completely in order to avoid choking library functions.
345 void sanitize_truncated_recipient(char *str)
348 if (num_tokens(str, ',') < 2) return;
350 int len = strlen(str);
351 if (len < 900) return;
352 if (len > 998) str[998] = 0;
354 char *cptr = strrchr(str, ',');
357 char *lptr = strchr(cptr, '<');
358 char *rptr = strchr(cptr, '>');
360 if ( (lptr) && (rptr) && (rptr > lptr) ) return;
367 * This function is self explanatory.
368 * (What can I say, I'm in a weird mood today...)
370 void remove_any_whitespace_to_the_left_or_right_of_at_symbol(char *name) {
374 for (ptr=name; *ptr; ++ptr) {
375 while ( (isspace(*ptr)) && (*(ptr+1)=='@') ) {
377 if (ptr > name) --ptr;
379 while ( (*ptr=='@') && (*(ptr+1)!=0) && (isspace(*(ptr+1))) ) {
380 strcpy(ptr+1, ptr+2);
386 // values that can be returned by expand_aliases()
388 EA_ERROR, // Can't send message due to bad address
389 EA_MULTIPLE, // Alias expanded into multiple recipients -- run me again!
390 EA_LOCAL, // Local message, do no network processing
391 EA_INTERNET // Convert msg and send as Internet mail
393 char *killo[] = { // FIXME remove this when diags are complete
401 // Process alias and routing info for email addresses
402 int expand_aliases(char *name) {
409 char *aliases = CtdlGetSysConfig(GLOBAL_ALIASES); // First hit the Global Alias Table
411 char *aptr = aliases;
412 while ((t = strtok_r(aptr, "\n", &aptr))) {
413 char *bar = strchr(t, '|');
417 if (!strcasecmp(name, t)) {
418 syslog(LOG_DEBUG, "internet_addressing: global alias <%s> to <%s>", name, bar);
425 if (strchr(name, ',')) {
430 char original_name[256]; // Now go for the regular aliases
431 safestrncpy(original_name, name, sizeof original_name);
433 // should these checks still be here, or maybe move them to split_recps() ?
435 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
436 stripallbut(name, '<', '>');
438 /* Hit the email address directory */
439 if (CtdlDirectoryLookup(aaa, name, sizeof aaa) == 0) {
443 if (strcasecmp(original_name, name)) {
444 syslog(LOG_INFO, "internet_addressing: directory alias <%s> to <%s>", original_name, name);
447 /* Change "user @ xxx" to "user" if xxx is an alias for this host */
448 for (a=0; name[a] != '\0'; ++a) {
449 if (name[a] == '@') {
450 if (CtdlHostAlias(&name[a+1]) == hostalias_localhost) {
452 syslog(LOG_DEBUG, "internet_addressing: host is local, recipient is <%s>", name);
458 /* determine local or remote type, see citadel.h */
459 at = haschar(name, '@');
460 if (at == 0) return(EA_LOCAL); /* no @'s - local address */
461 if (at > 1) return(EA_ERROR); /* >1 @'s - invalid address */
462 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
464 /* figure out the delivery mode */
465 extract_token(node, name, 1, '@', sizeof node);
467 /* If there are one or more dots in the nodename, we assume that it
468 * is an FQDN and will attempt SMTP delivery to the Internet.
470 if (haschar(node, '.') > 0) {
474 /* If we get to this point it's an invalid node name */
479 // Return a supplied list of email addresses as an array, removing superfluous information and syntax.
480 Array *split_recps(char *addresses) {
482 // Copy the supplied address list into our own memory space, because we are going to mangle it.
483 char *a = malloc(strlen(addresses));
486 // Strip out anything in double quotes
490 for (t=addresses; t[0]; ++t) {
500 // Transform all qualifying delimiters to commas
501 for (t=a; t[0]; ++t) {
502 if ((t[0]==';') || (t[0]=='|')) {
507 // Tokenize the recipients into an array
508 Array *recipients_array = array_new(256); // no single recipient should be bigger than 256 bytes
510 while ((t = strtok_r(r, ",", &r))) {
511 striplt(t); // strip leading and trailing whitespace
512 stripout(t, '(', ')'); // remove any portion in parentheses
513 stripallbut(t, '<', '>'); // if angle brackets are present, keep only what is inside them
514 array_append(recipients_array, t);
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);
572 int original_array_len = array_len(recp_array);
573 for (int r=0; r<array_len(recp_array); ++r) {
574 org_recp = (char *)array_get_element_at(recp_array, r);
575 strncpy(this_recp, org_recp, sizeof this_recp);
577 mailtype = expand_aliases(this_recp);
579 // If an alias expanded to multiple recipients, strip off those recipients and append them
580 // to the end of the array. This loop will hit those again when it gets there.
581 // Note that we don't do this after we get past the *original* array length, to avoid aliasing loops.
582 if (mailtype == EA_MULTIPLE) {
583 if (r < original_array_len) {
585 while ((comma = strrchr(this_recp, ','))) {
587 array_append(recp_array, &comma[1]);
588 strcpy(org_recp, this_recp);
596 mailtype = expand_aliases(this_recp); // do it ONCE again to handle alias expansions
597 if (mailtype == EA_MULTIPLE) {
598 mailtype = EA_ERROR; // and fail if it wants to expand a second time
604 case EA_LOCAL: // There are several types of "local" recipients.
606 // Old BBS conventions require mail to "sysop" to go somewhere. Send it to the admin room.
607 if (!strcasecmp(this_recp, "sysop")) {
609 strcpy(this_recp, CtdlGetConfigStr("c_aideroom"));
610 if (!IsEmptyStr(ret->recp_room)) {
611 strcat(ret->recp_room, "|");
613 strcat(ret->recp_room, this_recp);
616 // This handles rooms which can receive posts via email.
617 else if (!strncasecmp(this_recp, "room_", 5)) {
618 original_room = CC->room; // Remember where we parked
620 char mail_to_room[ROOMNAMELEN];
622 strncpy(mail_to_room, &this_recp[5], sizeof mail_to_room);
623 for (m = mail_to_room; *m; ++m) {
624 if (m[0] == '_') m[0]=' ';
626 if (!CtdlGetRoom(&CC->room, mail_to_room)) { // Find the room they asked for
628 err = CtdlDoIHavePermissionToPostInThisRoom( // check for write permissions to room
633 0 // 0 means "this is not a reply"
641 if (!IsEmptyStr(ret->recp_room)) {
642 strcat(ret->recp_room, "|");
644 strcat(ret->recp_room, &this_recp[5]);
646 if (!IsEmptyStr(ret->recp_orgroom)) {
647 strcat(ret->recp_orgroom, "|");
649 strcat(ret->recp_orgroom, org_recp);
653 else { // no such room exists
658 // Restore this session's original room location.
659 CC->room = original_room;
663 // This handles the most common case, which is mail to a user's inbox.
664 else if (CtdlGetUser(&tempUS, this_recp) == 0) {
666 strcpy(this_recp, tempUS.fullname);
667 if (!IsEmptyStr(ret->recp_local)) {
668 strcat(ret->recp_local, "|");
670 strcat(ret->recp_local, this_recp);
673 // No match for this recipient
680 // Yes, you're reading this correctly: if the target domain points back to the local system,
681 // the address is invalid. That's because if the address were valid, we would have
682 // already translated it to a local address by now.
683 if (IsDirectory(this_recp, 0)) {
689 if (!IsEmptyStr(ret->recp_internet)) {
690 strcat(ret->recp_internet, "|");
692 strcat(ret->recp_internet, this_recp);
701 if (IsEmptyStr(errmsg)) {
702 snprintf(append, sizeof append, "Invalid recipient: %s", this_recp);
705 snprintf(append, sizeof append, "%s", errmsg);
707 if ( (strlen(ret->errormsg) + strlen(append) + 3) < SIZ) {
708 if (!IsEmptyStr(ret->errormsg)) {
709 strcat(ret->errormsg, "; ");
711 strcat(ret->errormsg, append);
715 if (IsEmptyStr(ret->display_recp)) {
716 strcpy(append, this_recp);
719 snprintf(append, sizeof append, ", %s", this_recp);
721 if ( (strlen(ret->display_recp)+strlen(append)) < SIZ) {
722 strcat(ret->display_recp, append);
727 if ( (ret->num_local + ret->num_internet + ret->num_room + ret->num_error) == 0) {
728 ret->num_error = (-1);
729 strcpy(ret->errormsg, "No recipients specified.");
732 syslog(LOG_DEBUG, "internet_addressing: validate_recipients() = %d local, %d room, %d SMTP, %d error",
733 ret->num_local, ret->num_room, ret->num_internet, ret->num_error
737 array_free(recp_array);
744 * Destructor for recptypes
746 void free_recipients(struct recptypes *valid) {
752 if (valid->recptypes_magic != RECPTYPES_MAGIC) {
753 syslog(LOG_ERR, "internet_addressing: attempt to call free_recipients() on some other data type!");
757 if (valid->errormsg != NULL) free(valid->errormsg);
758 if (valid->recp_local != NULL) free(valid->recp_local);
759 if (valid->recp_internet != NULL) free(valid->recp_internet);
760 if (valid->recp_room != NULL) free(valid->recp_room);
761 if (valid->recp_orgroom != NULL) free(valid->recp_orgroom);
762 if (valid->display_recp != NULL) free(valid->display_recp);
763 if (valid->bounce_to != NULL) free(valid->bounce_to);
764 if (valid->envelope_from != NULL) free(valid->envelope_from);
765 if (valid->sending_room != NULL) free(valid->sending_room);
770 char *qp_encode_email_addrs(char *source) {
771 char *user, *node, *name;
772 const char headerStr[] = "=?UTF-8?Q?";
776 int need_to_encode = 0;
782 long nAddrPtrMax = 50;
787 if (source == NULL) return source;
788 if (IsEmptyStr(source)) return source;
789 syslog(LOG_DEBUG, "internet_addressing: qp_encode_email_addrs <%s>", source);
791 AddrPtr = malloc (sizeof (long) * nAddrPtrMax);
792 AddrUtf8 = malloc (sizeof (long) * nAddrPtrMax);
793 memset(AddrUtf8, 0, sizeof (long) * nAddrPtrMax);
796 while (!IsEmptyStr (&source[i])) {
797 if (nColons >= nAddrPtrMax){
800 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
801 memcpy (ptr, AddrPtr, sizeof (long) * nAddrPtrMax);
802 free (AddrPtr), AddrPtr = ptr;
804 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
805 memset(&ptr[nAddrPtrMax], 0, sizeof (long) * nAddrPtrMax);
807 memcpy (ptr, AddrUtf8, sizeof (long) * nAddrPtrMax);
808 free (AddrUtf8), AddrUtf8 = ptr;
811 if (((unsigned char) source[i] < 32) || ((unsigned char) source[i] > 126)) {
813 AddrUtf8[nColons] = 1;
815 if (source[i] == '"') {
816 InQuotes = !InQuotes;
818 if (!InQuotes && source[i] == ',') {
819 AddrPtr[nColons] = i;
824 if (need_to_encode == 0) {
831 EncodedMaxLen = nColons * (sizeof(headerStr) + 3) + SourceLen * 3;
832 Encoded = (char*) malloc (EncodedMaxLen);
834 for (i = 0; i < nColons; i++) {
835 source[AddrPtr[i]++] = '\0';
837 /* TODO: if libidn, this might get larger*/
838 user = malloc(SourceLen + 1);
839 node = malloc(SourceLen + 1);
840 name = malloc(SourceLen + 1);
844 for (i = 0; i < nColons && nPtr != NULL; i++) {
845 nmax = EncodedMaxLen - (nPtr - Encoded);
847 process_rfc822_addr(&source[AddrPtr[i]], user, node, name);
848 /* TODO: libIDN here ! */
849 if (IsEmptyStr(name)) {
850 n = snprintf(nPtr, nmax, (i==0)?"%s@%s" : ",%s@%s", user, node);
853 EncodedName = rfc2047encode(name, strlen(name));
854 n = snprintf(nPtr, nmax, (i==0)?"%s <%s@%s>" : ",%s <%s@%s>", EncodedName, user, node);
859 n = snprintf(nPtr, nmax, (i==0)?"%s" : ",%s", &source[AddrPtr[i]]);
865 ptr = (char*) malloc(EncodedMaxLen * 2);
866 memcpy(ptr, Encoded, EncodedMaxLen);
867 nnPtr = ptr + (nPtr - Encoded), nPtr = nnPtr;
868 free(Encoded), Encoded = ptr;
870 i--; /* do it once more with properly lengthened buffer */
873 for (i = 0; i < nColons; i++)
874 source[--AddrPtr[i]] = ',';
886 * Unfold a multi-line field into a single line, removing multi-whitespaces
888 void unfold_rfc822_field(char **field, char **FieldEnd)
891 char *pField = *field;
893 char *pFieldEnd = *FieldEnd;
895 while (isspace(*pField))
897 /* remove leading/trailing whitespace */
900 while (isspace(*pFieldEnd))
903 *FieldEnd = pFieldEnd;
904 /* convert non-space whitespace to spaces, and remove double blanks */
905 for (sField = *field = pField;
909 if ((*sField=='\r') || (*sField=='\n'))
912 while ( ( (*(sField + offset) == '\r') || (*(sField + offset) == '\n' )) && (sField + offset < pFieldEnd) ) {
919 if (*sField=='\"') quote = 1 - quote;
921 if (isspace(*sField)) {
926 while ((sField < pFieldEnd) &&
931 else *pField = *sField;
933 else *pField = *sField;
937 *FieldEnd = pField - 1;
942 * Split an RFC822-style address into userid, host, and full name
945 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name) {
949 strcpy(node, CtdlGetConfigStr("c_fqdn"));
952 if (rfc822 == NULL) return;
954 /* extract full name - first, it's From minus <userid> */
955 strcpy(name, rfc822);
956 stripout(name, '<', '>');
958 /* strip anything to the left of a bang */
959 while ((!IsEmptyStr(name)) && (haschar(name, '!') > 0))
960 strcpy(name, &name[1]);
962 /* and anything to the right of a @ or % */
963 for (a = 0; name[a] != '\0'; ++a) {
964 if (name[a] == '@') {
968 if (name[a] == '%') {
974 /* but if there are parentheses, that changes the rules... */
975 if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
976 strcpy(name, rfc822);
977 stripallbut(name, '(', ')');
980 /* but if there are a set of quotes, that supersedes everything */
981 if (haschar(rfc822, 34) == 2) {
982 strcpy(name, rfc822);
983 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
984 strcpy(&name[0], &name[1]);
986 strcpy(&name[0], &name[1]);
987 for (a = 0; name[a] != '\0'; ++a)
993 /* extract user id */
994 strcpy(user, rfc822);
996 /* first get rid of anything in parens */
997 stripout(user, '(', ')');
999 /* if there's a set of angle brackets, strip it down to that */
1000 if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
1001 stripallbut(user, '<', '>');
1004 /* strip anything to the left of a bang */
1005 while ((!IsEmptyStr(user)) && (haschar(user, '!') > 0))
1006 strcpy(user, &user[1]);
1008 /* and anything to the right of a @ or % */
1009 for (a = 0; user[a] != '\0'; ++a) {
1010 if (user[a] == '@') {
1014 if (user[a] == '%') {
1021 /* extract node name */
1022 strcpy(node, rfc822);
1024 /* first get rid of anything in parens */
1025 stripout(node, '(', ')');
1027 /* if there's a set of angle brackets, strip it down to that */
1028 if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
1029 stripallbut(node, '<', '>');
1032 /* If no node specified, tack ours on instead */
1034 (haschar(node, '@')==0)
1035 && (haschar(node, '%')==0)
1036 && (haschar(node, '!')==0)
1038 strcpy(node, CtdlGetConfigStr("c_nodename"));
1042 /* strip anything to the left of a @ */
1043 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0))
1044 strcpy(node, &node[1]);
1046 /* strip anything to the left of a % */
1047 while ((!IsEmptyStr(node)) && (haschar(node, '%') > 0))
1048 strcpy(node, &node[1]);
1050 /* reduce multiple system bang paths to node!user */
1051 while ((!IsEmptyStr(node)) && (haschar(node, '!') > 1))
1052 strcpy(node, &node[1]);
1054 /* now get rid of the user portion of a node!user string */
1055 for (a = 0; node[a] != '\0'; ++a)
1056 if (node[a] == '!') {
1062 /* strip leading and trailing spaces in all strings */
1067 /* If we processed a string that had the address in angle brackets
1068 * but no name outside the brackets, we now have an empty name. In
1069 * this case, use the user portion of the address as the name.
1071 if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
1078 * convert_field() is a helper function for convert_internet_message().
1079 * Given start/end positions for an rfc822 field, it converts it to a Citadel
1080 * field if it wants to, and unfolds it if necessary.
1082 * Returns 1 if the field was converted and inserted into the Citadel message
1083 * structure, implying that the source field should be removed from the
1086 int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
1087 char *key, *value, *valueend;
1091 const char *colonpos = NULL;
1100 for (pos = end; pos >= beg; pos--) {
1101 if (*pos == ':') colonpos = pos;
1104 if (colonpos == NULL) return(0); /* no colon? not a valid header line */
1107 key = malloc(len + 2);
1108 memcpy(key, beg, len + 1);
1110 valueend = key + len;
1111 * ( key + (colonpos - beg) ) = '\0';
1112 value = &key[(colonpos - beg) + 1];
1113 /* printf("Header: [%s]\nValue: [%s]\n", key, value); */
1114 unfold_rfc822_field(&value, &valueend);
1115 valuelen = valueend - value + 1;
1116 /* printf("UnfoldedValue: [%s]\n", value); */
1119 * Here's the big rfc822-to-citadel loop.
1122 /* Date/time is converted into a unix timestamp. If the conversion
1123 * fails, we replace it with the time the message arrived locally.
1125 if (!strcasecmp(key, "Date")) {
1126 parsed_date = parsedate(value);
1127 if (parsed_date < 0L) parsed_date = time(NULL);
1129 if (CM_IsEmpty(msg, eTimestamp))
1130 CM_SetFieldLONG(msg, eTimestamp, parsed_date);
1134 else if (!strcasecmp(key, "From")) {
1135 process_rfc822_addr(value, user, node, name);
1136 syslog(LOG_DEBUG, "internet_addressing: converted to <%s@%s> (%s)", user, node, name);
1137 snprintf(addr, sizeof(addr), "%s@%s", user, node);
1138 if (CM_IsEmpty(msg, eAuthor) && !IsEmptyStr(name)) {
1139 CM_SetField(msg, eAuthor, name, -1);
1141 if (CM_IsEmpty(msg, erFc822Addr) && !IsEmptyStr(addr)) {
1142 CM_SetField(msg, erFc822Addr, addr, -1);
1147 else if (!strcasecmp(key, "Subject")) {
1148 if (CM_IsEmpty(msg, eMsgSubject))
1149 CM_SetField(msg, eMsgSubject, value, valuelen);
1153 else if (!strcasecmp(key, "List-ID")) {
1154 if (CM_IsEmpty(msg, eListID))
1155 CM_SetField(msg, eListID, value, valuelen);
1159 else if (!strcasecmp(key, "To")) {
1160 if (CM_IsEmpty(msg, eRecipient))
1161 CM_SetField(msg, eRecipient, value, valuelen);
1165 else if (!strcasecmp(key, "CC")) {
1166 if (CM_IsEmpty(msg, eCarbonCopY))
1167 CM_SetField(msg, eCarbonCopY, value, valuelen);
1171 else if (!strcasecmp(key, "Message-ID")) {
1172 if (!CM_IsEmpty(msg, emessageId)) {
1173 syslog(LOG_WARNING, "internet_addressing: duplicate message id");
1180 pValueLen = valuelen;
1181 /* Strip angle brackets */
1182 while (haschar(pValue, '<') > 0) {
1187 for (i = 0; i <= pValueLen; ++i)
1188 if (pValue[i] == '>') {
1193 CM_SetField(msg, emessageId, pValue, pValueLen);
1199 else if (!strcasecmp(key, "Return-Path")) {
1200 if (CM_IsEmpty(msg, eMessagePath))
1201 CM_SetField(msg, eMessagePath, value, valuelen);
1205 else if (!strcasecmp(key, "Envelope-To")) {
1206 if (CM_IsEmpty(msg, eenVelopeTo))
1207 CM_SetField(msg, eenVelopeTo, value, valuelen);
1211 else if (!strcasecmp(key, "References")) {
1212 CM_SetField(msg, eWeferences, value, valuelen);
1216 else if (!strcasecmp(key, "Reply-To")) {
1217 CM_SetField(msg, eReplyTo, value, valuelen);
1221 else if (!strcasecmp(key, "In-reply-to")) {
1222 if (CM_IsEmpty(msg, eWeferences)) /* References: supersedes In-reply-to: */
1223 CM_SetField(msg, eWeferences, value, valuelen);
1229 /* Clean up and move on. */
1230 free(key); /* Don't free 'value', it's actually the same buffer */
1236 * Convert RFC822 references format (References) to Citadel references format (Weferences)
1238 void convert_references_to_wefewences(char *str) {
1239 int bracket_nesting = 0;
1241 char *moveptr = NULL;
1248 if (bracket_nesting < 0) bracket_nesting = 0;
1250 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
1254 else if (bracket_nesting > 0) {
1260 *moveptr = *(moveptr+1);
1264 if (ch == '<') ++bracket_nesting;
1271 * Convert an RFC822 message (headers + body) to a CtdlMessage structure.
1272 * NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
1273 * will be deallocated when CM_Free() is called. Therefore, the
1274 * supplied buffer should be DEREFERENCED. It should not be freed or used
1277 struct CtdlMessage *convert_internet_message(char *rfc822) {
1278 StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
1280 return convert_internet_message_buf(&RFCBuf);
1284 struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822)
1286 struct CtdlMessage *msg;
1287 const char *pos, *beg, *end, *totalend;
1288 int done, alldone = 0;
1290 StrBuf *OtherHeaders;
1292 msg = malloc(sizeof(struct CtdlMessage));
1293 if (msg == NULL) return msg;
1295 memset(msg, 0, sizeof(struct CtdlMessage));
1296 msg->cm_magic = CTDLMESSAGE_MAGIC; /* self check */
1297 msg->cm_anon_type = 0; /* never anonymous */
1298 msg->cm_format_type = FMT_RFC822; /* internet message */
1300 pos = ChrPtr(*rfc822);
1301 totalend = pos + StrLength(*rfc822);
1303 OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
1307 /* Locate beginning and end of field, keeping in mind that
1308 * some fields might be multiline
1312 while ((end < totalend) &&
1317 if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) )
1322 /* done with headers? */
1324 ( (*(pos+1)=='\n') ||
1330 if (pos >= (totalend - 1) )
1340 /* At this point we have a field. Are we interested in it? */
1341 converted = convert_field(msg, beg, end);
1343 /* Strip the field out of the RFC822 header if we used it */
1345 StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
1346 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1349 /* If we've hit the end of the message, bail out */
1350 if (pos >= totalend)
1353 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1355 StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
1357 CM_SetAsFieldSB(msg, eMesageText, &OtherHeaders);
1359 /* Follow-up sanity checks... */
1361 /* If there's no timestamp on this message, set it to now. */
1362 if (CM_IsEmpty(msg, eTimestamp)) {
1363 CM_SetFieldLONG(msg, eTimestamp, time(NULL));
1366 /* If a W (references, or rather, Wefewences) field is present, we
1367 * have to convert it from RFC822 format to Citadel format.
1369 if (!CM_IsEmpty(msg, eWeferences)) {
1371 convert_references_to_wefewences(msg->cm_fields[eWeferences]);
1379 * Look for a particular header field in an RFC822 message text. If the
1380 * requested field is found, it is unfolded (if necessary) and returned to
1381 * the caller. The field name is stripped out, leaving only its contents.
1382 * The caller is responsible for freeing the returned buffer. If the requested
1383 * field is not present, or anything else goes wrong, it returns NULL.
1385 char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
1386 char *fieldbuf = NULL;
1387 const char *end_of_headers;
1388 const char *field_start;
1393 /* Should never happen, but sometimes we get stupid */
1394 if (rfc822 == NULL) return(NULL);
1395 if (fieldname == NULL) return(NULL);
1397 snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
1399 /* Locate the end of the headers, so we don't run past that point */
1400 end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
1401 if (end_of_headers == NULL) {
1402 end_of_headers = cbmstrcasestr(rfc822, "\n\n");
1404 if (end_of_headers == NULL) return (NULL);
1406 field_start = cbmstrcasestr(rfc822, fieldhdr);
1407 if (field_start == NULL) return(NULL);
1408 if (field_start > end_of_headers) return(NULL);
1410 fieldbuf = malloc(SIZ);
1411 strcpy(fieldbuf, "");
1414 ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
1415 while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
1416 strcat(fieldbuf, " ");
1417 cont = &fieldbuf[strlen(fieldbuf)];
1418 ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
1422 strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
1429 /*****************************************************************************
1430 * DIRECTORY MANAGEMENT FUNCTIONS *
1431 *****************************************************************************/
1434 * Generate the index key for an Internet e-mail address to be looked up
1437 void directory_key(char *key, char *addr) {
1441 for (i=0; !IsEmptyStr(&addr[i]); ++i) {
1442 if (!isspace(addr[i])) {
1443 key[keylen++] = tolower(addr[i]);
1448 syslog(LOG_DEBUG, "internet_addressing: directory key is <%s>", key);
1453 * Return nonzero if the supplied address is in one of "our" domains
1455 int IsDirectory(char *addr, int allow_masq_domains) {
1459 extract_token(domain, addr, 1, '@', sizeof domain);
1462 h = CtdlHostAlias(domain);
1464 if ( (h == hostalias_masq) && allow_masq_domains)
1467 if (h == hostalias_localhost) {
1477 * Add an Internet e-mail address to the directory for a user
1479 int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
1482 if (IsDirectory(internet_addr, 0) == 0) {
1485 syslog(LOG_DEBUG, "internet_addressing: create directory entry: %s --> %s", internet_addr, citadel_addr);
1486 directory_key(key, internet_addr);
1487 cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
1493 * Delete an Internet e-mail address from the directory.
1495 * (NOTE: we don't actually use or need the citadel_addr variable; it's merely
1496 * here because the callback API expects to be able to send it.)
1498 int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
1501 syslog(LOG_DEBUG, "internet_addressing: delete directory entry: %s --> %s", internet_addr, citadel_addr);
1502 directory_key(key, internet_addr);
1503 return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
1508 * Look up an Internet e-mail address in the directory.
1509 * On success: returns 0, and Citadel address stored in 'target'
1510 * On failure: returns nonzero
1512 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
1513 struct cdbdata *cdbrec;
1516 /* Dump it in there unchanged, just for kicks */
1517 if (target != NULL) {
1518 safestrncpy(target, internet_addr, targbuflen);
1521 /* Only do lookups for addresses with hostnames in them */
1522 if (num_tokens(internet_addr, '@') != 2) return(-1);
1524 /* Only do lookups for domains in the directory */
1525 if (IsDirectory(internet_addr, 0) == 0) return(-1);
1527 directory_key(key, internet_addr);
1528 cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key) );
1529 if (cdbrec != NULL) {
1530 if (target != NULL) {
1531 safestrncpy(target, cdbrec->ptr, targbuflen);
1542 * Harvest any email addresses that someone might want to have in their
1543 * "collected addresses" book.
1545 char *harvest_collected_addresses(struct CtdlMessage *msg) {
1548 char user[256], node[256], name[256];
1551 eMsgField field = 0;
1553 if (msg == NULL) return(NULL);
1557 if (!CM_IsEmpty(msg, eAuthor)) {
1558 strcat(addr, msg->cm_fields[eAuthor]);
1560 if (!CM_IsEmpty(msg, erFc822Addr)) {
1562 strcat(addr, msg->cm_fields[erFc822Addr]);
1564 if (IsDirectory(msg->cm_fields[erFc822Addr], 0)) {
1569 if (is_harvestable) {
1570 coll = strdup(addr);
1576 if (coll == NULL) return(NULL);
1578 /* Scan both the R (To) and Y (CC) fields */
1579 for (i = 0; i < 2; ++i) {
1580 if (i == 0) field = eRecipient;
1581 if (i == 1) field = eCarbonCopY;
1583 if (!CM_IsEmpty(msg, field)) {
1584 for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
1585 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
1586 if (strstr(addr, "=?") != NULL)
1587 utf8ify_rfc822_string(addr);
1588 process_rfc822_addr(addr, user, node, name);
1589 h = CtdlHostAlias(node);
1590 if (h != hostalias_localhost) {
1591 coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1592 if (coll == NULL) return(NULL);
1593 if (!IsEmptyStr(coll)) {
1603 if (IsEmptyStr(coll)) {
1612 * Helper function for CtdlRebuildDirectoryIndex()
1614 void CtdlRebuildDirectoryIndex_backend(char *username, void *data) {
1617 struct ctdluser usbuf;
1619 if (CtdlGetUser(&usbuf, username) != 0) {
1623 if ( (!IsEmptyStr(usbuf.fullname)) && (!IsEmptyStr(usbuf.emailaddrs)) ) {
1624 for (j=0; j<num_tokens(usbuf.emailaddrs, '|'); ++j) {
1625 char one_email[512];
1626 extract_token(one_email, usbuf.emailaddrs, j, '|', sizeof one_email);
1627 CtdlDirectoryAddUser(one_email, usbuf.fullname);
1634 * Initialize the directory database (erasing anything already there)
1636 void CtdlRebuildDirectoryIndex(void) {
1637 syslog(LOG_INFO, "internet_addressing: rebuilding email address directory index");
1638 cdb_trunc(CDB_DIRECTORY);
1639 ForEachUser(CtdlRebuildDirectoryIndex_backend, NULL);
1644 * Configure Internet email addresses for a user account, updating the Directory Index in the process
1646 void CtdlSetEmailAddressesForUser(char *requested_user, char *new_emailaddrs)
1648 struct ctdluser usbuf;
1652 if (CtdlGetUserLock(&usbuf, requested_user) != 0) { // We are relying on the fact that the DirectoryIndex functions don't lock.
1653 return; // Silently fail here if we can't acquire a lock on the user record.
1656 syslog(LOG_DEBUG, "internet_addressing: setting email addresses for <%s> to <%s>", usbuf.fullname, new_emailaddrs);
1658 /* Delete all of the existing directory index records for the user (easier this way) */
1659 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1660 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1661 CtdlDirectoryDelUser(buf, requested_user);
1664 strcpy(usbuf.emailaddrs, new_emailaddrs); // make it official.
1666 /* Index all of the new email addresses (they've already been sanitized) */
1667 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1668 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1669 CtdlDirectoryAddUser(buf, requested_user);
1672 CtdlPutUserLock(&usbuf);
1677 * Auto-generate an Internet email address for a user account
1679 void AutoGenerateEmailAddressForUser(struct ctdluser *user)
1681 char synthetic_email_addr[1024];
1685 for (i=0; u==0; ++i) {
1687 // first try just converting the user name to lowercase and replacing spaces with underscores
1688 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "%s@%s", user->fullname, CtdlGetConfigStr("c_fqdn"));
1689 for (j=0; ((synthetic_email_addr[j] != '\0')&&(synthetic_email_addr[j] != '@')); j++) {
1690 synthetic_email_addr[j] = tolower(synthetic_email_addr[j]);
1691 if (!isalnum(synthetic_email_addr[j])) {
1692 synthetic_email_addr[j] = '_';
1697 // then try 'ctdl' followed by the user number
1698 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08lx@%s", user->usernum, CtdlGetConfigStr("c_fqdn"));
1701 // oof. just keep trying other numbers until we find one
1702 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08x@%s", i, CtdlGetConfigStr("c_fqdn"));
1704 u = CtdlDirectoryLookup(NULL, synthetic_email_addr, 0);
1705 syslog(LOG_DEBUG, "user_ops: address <%s> lookup returned <%d>", synthetic_email_addr, u);
1708 CtdlSetEmailAddressesForUser(user->fullname, synthetic_email_addr);
1709 strncpy(CC->user.emailaddrs, synthetic_email_addr, sizeof(user->emailaddrs));
1710 syslog(LOG_DEBUG, "user_ops: auto-generated email address <%s> for <%s>", synthetic_email_addr, user->fullname);