1 // This file contains functions which handle the mapping of Internet addresses
2 // to users on the Citadel system.
4 // Copyright (c) 1987-2021 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)
331 if (num_tokens(str, ',') < 2) return;
333 int len = strlen(str);
334 if (len < 900) return;
335 if (len > 998) str[998] = 0;
337 char *cptr = strrchr(str, ',');
340 char *lptr = strchr(cptr, '<');
341 char *rptr = strchr(cptr, '>');
343 if ( (lptr) && (rptr) && (rptr > lptr) ) return;
349 // This function is self explanatory.
350 // (What can I say, I'm in a weird mood today...)
351 void remove_any_whitespace_to_the_left_or_right_of_at_symbol(char *name) {
355 for (ptr=name; *ptr; ++ptr) {
356 while ( (isspace(*ptr)) && (*(ptr+1)=='@') ) {
358 if (ptr > name) --ptr;
360 while ( (*ptr=='@') && (*(ptr+1)!=0) && (isspace(*(ptr+1))) ) {
361 strcpy(ptr+1, ptr+2);
367 // values that can be returned by expand_aliases()
369 EA_ERROR, // Can't send message due to bad address
370 EA_MULTIPLE, // Alias expanded into multiple recipients -- run me again!
371 EA_LOCAL, // Local message, do no network processing
372 EA_INTERNET, // Convert msg and send as Internet mail
373 EA_SKIP // This recipient has been invalidated -- skip it!
377 // Process alias and routing info for email addresses
378 int expand_aliases(char *name, char *aliases) {
384 int num_aliases = num_tokens(aliases, '\n');
385 for (a=0; a<num_aliases; ++a) {
386 extract_token(aaa, aliases, a, '\n', sizeof aaa);
387 char *bar = strchr(aaa, '|');
393 if ( (!IsEmptyStr(aaa)) && (!strcasecmp(name, aaa)) ) {
394 syslog(LOG_DEBUG, "internet_addressing: global alias <%s> to <%s>", name, bar);
399 if (strchr(name, ',')) {
404 char original_name[256]; // Now go for the regular aliases
405 safestrncpy(original_name, name, sizeof original_name);
407 // should these checks still be here, or maybe move them to split_recps() ?
409 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
410 stripallbut(name, '<', '>');
412 // Hit the email address directory
413 if (CtdlDirectoryLookup(aaa, name, sizeof aaa) == 0) {
417 if (strcasecmp(original_name, name)) {
418 syslog(LOG_INFO, "internet_addressing: directory alias <%s> to <%s>", original_name, name);
421 // Change "user @ xxx" to "user" if xxx is an alias for this host
422 for (a=0; name[a] != '\0'; ++a) {
423 if (name[a] == '@') {
424 if (CtdlHostAlias(&name[a+1]) == hostalias_localhost) {
426 syslog(LOG_DEBUG, "internet_addressing: host is local, recipient is <%s>", name);
432 // Is this a local or remote recipient?
433 at = haschar(name, '@');
435 return(EA_LOCAL); // no @'s = local address
438 return(EA_INTERNET); // one @ = internet address
441 return(EA_ERROR); // more than one @ = badly formed address
446 // Return a supplied list of email addresses as an array, removing superfluous information and syntax.
447 // If an existing Array is supplied as "append_to" it will do so; otherwise a new Array is allocated.
448 Array *split_recps(char *addresses, Array *append_to) {
450 if (IsEmptyStr(addresses)) { // nothing supplied, nothing returned
454 // Copy the supplied address list into our own memory space, because we are going to modify it.
455 char *a = strdup(addresses);
457 syslog(LOG_ERR, "internet_addressing: malloc() failed: %m");
461 // Strip out anything in double quotes
466 r = strrchr(a, '\"');
472 // Transform all qualifying delimiters to commas
473 for (char *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, ',');
489 for (int i=0; i<num_addresses; ++i) {
490 char this_address[256];
491 extract_token(this_address, a, i, ',', sizeof this_address);
492 striplt(this_address); // strip leading and trailing whitespace
493 stripout(this_address, '(', ')'); // remove any portion in parentheses
494 stripallbut(this_address, '<', '>'); // if angle brackets are present, keep only what is inside them
495 if (!IsEmptyStr(this_address)) {
496 array_append(recipients_array, this_address);
500 free(a); // We don't need this buffer anymore.
501 return(recipients_array); // Return the completed array to the caller.
505 // Validate recipients, count delivery types and errors, and handle aliasing
507 // Returns 0 if all addresses are ok, ret->num_error = -1 if no addresses
508 // were specified, or the number of addresses found invalid.
510 // Caller needs to free the result using free_recipients()
512 struct recptypes *validate_recipients(char *supplied_recipients, const char *RemoteIdentifier, int Flags) {
513 struct recptypes *ret;
514 char *recipients = NULL;
519 struct ctdluser tempUS;
520 struct ctdlroom original_room;
526 ret = (struct recptypes *) malloc(sizeof(struct recptypes)); // Initialize
527 if (ret == NULL) return(NULL);
528 memset(ret, 0, sizeof(struct recptypes)); // set all values to null/zero
530 if (supplied_recipients == NULL) {
531 recipients = strdup("");
534 recipients = strdup(supplied_recipients);
537 len = strlen(recipients) + 1024; // allocate memory
538 ret->errormsg = malloc(len);
539 ret->recp_local = malloc(len);
540 ret->recp_internet = malloc(len);
541 ret->recp_room = malloc(len);
542 ret->display_recp = malloc(len);
543 ret->recp_orgroom = malloc(len);
545 ret->errormsg[0] = 0;
546 ret->recp_local[0] = 0;
547 ret->recp_internet[0] = 0;
548 ret->recp_room[0] = 0;
549 ret->recp_orgroom[0] = 0;
550 ret->display_recp[0] = 0;
551 ret->recptypes_magic = RECPTYPES_MAGIC;
553 Array *recp_array = split_recps(supplied_recipients, NULL);
555 char *aliases = CtdlGetSysConfig(GLOBAL_ALIASES); // First hit the Global Alias Table
557 for (int r=0; (recp_array && r<array_len(recp_array)); ++r) {
558 org_recp = (char *)array_get_element_at(recp_array, r);
559 strncpy(this_recp, org_recp, sizeof this_recp);
561 for (int i=0; i<3; ++i) { // pass three times through the aliaser
562 mailtype = expand_aliases(this_recp, aliases);
564 // If an alias expanded to multiple recipients, strip off those recipients and append them
565 // to the end of the array. This loop will hit those again when it gets there.
566 if (mailtype == EA_MULTIPLE) {
567 recp_array = split_recps(this_recp, recp_array);
571 for (int j=0; j<r; ++j) {
572 if (!strcasecmp(this_recp , (char *)array_get_element_at(recp_array, j) )) {
576 syslog(LOG_DEBUG, "Recipient #%d of type %d is <%s>", r, mailtype, this_recp);
581 case EA_LOCAL: // There are several types of "local" recipients.
583 // Old BBS conventions require mail to "sysop" to go somewhere. Send it to the admin room.
584 if (!strcasecmp(this_recp, "sysop")) {
586 strcpy(this_recp, CtdlGetConfigStr("c_aideroom"));
587 if (!IsEmptyStr(ret->recp_room)) {
588 strcat(ret->recp_room, "|");
590 strcat(ret->recp_room, this_recp);
593 // This handles rooms which can receive posts via email.
594 else if (!strncasecmp(this_recp, "room_", 5)) {
595 original_room = CC->room; // Remember where we parked
597 char mail_to_room[ROOMNAMELEN];
599 strncpy(mail_to_room, &this_recp[5], sizeof mail_to_room);
600 for (m = mail_to_room; *m; ++m) {
601 if (m[0] == '_') m[0]=' ';
603 if (!CtdlGetRoom(&CC->room, mail_to_room)) { // Find the room they asked for
605 err = CtdlDoIHavePermissionToPostInThisRoom( // check for write permissions to room
610 0 // 0 means "this is not a reply"
618 if (!IsEmptyStr(ret->recp_room)) {
619 strcat(ret->recp_room, "|");
621 strcat(ret->recp_room, &this_recp[5]);
623 if (!IsEmptyStr(ret->recp_orgroom)) {
624 strcat(ret->recp_orgroom, "|");
626 strcat(ret->recp_orgroom, org_recp);
630 else { // no such room exists
635 // Restore this session's original room location.
636 CC->room = original_room;
640 // This handles the most common case, which is mail to a user's inbox.
641 else if (CtdlGetUser(&tempUS, this_recp) == 0) {
643 strcpy(this_recp, tempUS.fullname);
644 if (!IsEmptyStr(ret->recp_local)) {
645 strcat(ret->recp_local, "|");
647 strcat(ret->recp_local, this_recp);
650 // No match for this recipient
657 // Yes, you're reading this correctly: if the target domain points back to the local system,
658 // the address is invalid. That's because if the address were valid, we would have
659 // already translated it to a local address by now.
660 if (IsDirectory(this_recp, 0)) {
666 if (!IsEmptyStr(ret->recp_internet)) {
667 strcat(ret->recp_internet, "|");
669 strcat(ret->recp_internet, this_recp);
674 // no action required, anything in this slot has already been processed elsewhere
682 if (IsEmptyStr(errmsg)) {
683 snprintf(append, sizeof append, "Invalid recipient: %s", this_recp);
686 snprintf(append, sizeof append, "%s", errmsg);
688 if ( (strlen(ret->errormsg) + strlen(append) + 3) < SIZ) {
689 if (!IsEmptyStr(ret->errormsg)) {
690 strcat(ret->errormsg, "; ");
692 strcat(ret->errormsg, append);
696 if (IsEmptyStr(ret->display_recp)) {
697 strcpy(append, this_recp);
700 snprintf(append, sizeof append, ", %s", this_recp);
702 if ( (strlen(ret->display_recp)+strlen(append)) < SIZ) {
703 strcat(ret->display_recp, append);
708 if (aliases != NULL) { // ok, we're done with the global alias list now
712 if ( (ret->num_local + ret->num_internet + ret->num_room + ret->num_error) == 0) {
713 ret->num_error = (-1);
714 strcpy(ret->errormsg, "No recipients specified.");
717 syslog(LOG_DEBUG, "internet_addressing: validate_recipients() = %d local, %d room, %d SMTP, %d error",
718 ret->num_local, ret->num_room, ret->num_internet, ret->num_error
723 array_free(recp_array);
730 // Destructor for recptypes
731 void free_recipients(struct recptypes *valid) {
737 if (valid->recptypes_magic != RECPTYPES_MAGIC) {
738 syslog(LOG_ERR, "internet_addressing: attempt to call free_recipients() on some other data type!");
742 if (valid->errormsg != NULL) free(valid->errormsg);
743 if (valid->recp_local != NULL) free(valid->recp_local);
744 if (valid->recp_internet != NULL) free(valid->recp_internet);
745 if (valid->recp_room != NULL) free(valid->recp_room);
746 if (valid->recp_orgroom != NULL) free(valid->recp_orgroom);
747 if (valid->display_recp != NULL) free(valid->display_recp);
748 if (valid->bounce_to != NULL) free(valid->bounce_to);
749 if (valid->envelope_from != NULL) free(valid->envelope_from);
750 if (valid->sending_room != NULL) free(valid->sending_room);
755 char *qp_encode_email_addrs(char *source) {
756 char *user, *node, *name;
757 const char headerStr[] = "=?UTF-8?Q?";
761 int need_to_encode = 0;
767 long nAddrPtrMax = 50;
772 if (source == NULL) return source;
773 if (IsEmptyStr(source)) return source;
774 syslog(LOG_DEBUG, "internet_addressing: qp_encode_email_addrs <%s>", source);
776 AddrPtr = malloc (sizeof (long) * nAddrPtrMax);
777 AddrUtf8 = malloc (sizeof (long) * nAddrPtrMax);
778 memset(AddrUtf8, 0, sizeof (long) * nAddrPtrMax);
781 while (!IsEmptyStr (&source[i])) {
782 if (nColons >= nAddrPtrMax){
785 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
786 memcpy (ptr, AddrPtr, sizeof (long) * nAddrPtrMax);
787 free (AddrPtr), AddrPtr = ptr;
789 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
790 memset(&ptr[nAddrPtrMax], 0, sizeof (long) * nAddrPtrMax);
792 memcpy (ptr, AddrUtf8, sizeof (long) * nAddrPtrMax);
793 free (AddrUtf8), AddrUtf8 = ptr;
796 if (((unsigned char) source[i] < 32) || ((unsigned char) source[i] > 126)) {
798 AddrUtf8[nColons] = 1;
800 if (source[i] == '"') {
801 InQuotes = !InQuotes;
803 if (!InQuotes && source[i] == ',') {
804 AddrPtr[nColons] = i;
809 if (need_to_encode == 0) {
816 EncodedMaxLen = nColons * (sizeof(headerStr) + 3) + SourceLen * 3;
817 Encoded = (char*) malloc (EncodedMaxLen);
819 for (i = 0; i < nColons; i++) {
820 source[AddrPtr[i]++] = '\0';
822 // TODO: if libidn, this might get larger
823 user = malloc(SourceLen + 1);
824 node = malloc(SourceLen + 1);
825 name = malloc(SourceLen + 1);
829 for (i = 0; i < nColons && nPtr != NULL; i++) {
830 nmax = EncodedMaxLen - (nPtr - Encoded);
832 process_rfc822_addr(&source[AddrPtr[i]], user, node, name);
833 // TODO: libIDN here !
834 if (IsEmptyStr(name)) {
835 n = snprintf(nPtr, nmax, (i==0)?"%s@%s" : ",%s@%s", user, node);
838 EncodedName = rfc2047encode(name, strlen(name));
839 n = snprintf(nPtr, nmax, (i==0)?"%s <%s@%s>" : ",%s <%s@%s>", EncodedName, user, node);
844 n = snprintf(nPtr, nmax, (i==0)?"%s" : ",%s", &source[AddrPtr[i]]);
850 ptr = (char*) malloc(EncodedMaxLen * 2);
851 memcpy(ptr, Encoded, EncodedMaxLen);
852 nnPtr = ptr + (nPtr - Encoded), nPtr = nnPtr;
853 free(Encoded), Encoded = ptr;
855 i--; // do it once more with properly lengthened buffer
858 for (i = 0; i < nColons; i++)
859 source[--AddrPtr[i]] = ',';
870 // Unfold a multi-line field into a single line, removing multi-whitespaces
871 void unfold_rfc822_field(char **field, char **FieldEnd)
874 char *pField = *field;
876 char *pFieldEnd = *FieldEnd;
878 while (isspace(*pField))
880 // remove leading/trailing whitespace
883 while (isspace(*pFieldEnd))
886 *FieldEnd = pFieldEnd;
887 // convert non-space whitespace to spaces, and remove double blanks
888 for (sField = *field = pField;
892 if ((*sField=='\r') || (*sField=='\n'))
895 while ( ( (*(sField + offset) == '\r') || (*(sField + offset) == '\n' )) && (sField + offset < pFieldEnd) ) {
902 if (*sField=='\"') quote = 1 - quote;
904 if (isspace(*sField)) {
909 while ((sField < pFieldEnd) &&
914 else *pField = *sField;
916 else *pField = *sField;
920 *FieldEnd = pField - 1;
924 // Split an RFC822-style address into userid, host, and full name
926 // Note: This still handles obsolete address syntaxes such as user%node@node and ...node!user
927 // We should probably remove that.
928 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name) {
932 strcpy(node, CtdlGetConfigStr("c_fqdn"));
935 if (rfc822 == NULL) return;
937 // extract full name - first, it's From minus <userid>
938 strcpy(name, rfc822);
939 stripout(name, '<', '>');
941 // strip anything to the left of a bang
942 while ((!IsEmptyStr(name)) && (haschar(name, '!') > 0))
943 strcpy(name, &name[1]);
945 // and anything to the right of a @ or %
946 for (a = 0; name[a] != '\0'; ++a) {
947 if (name[a] == '@') {
951 if (name[a] == '%') {
957 // but if there are parentheses, that changes the rules...
958 if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
959 strcpy(name, rfc822);
960 stripallbut(name, '(', ')');
963 // but if there are a set of quotes, that supersedes everything
964 if (haschar(rfc822, 34) == 2) {
965 strcpy(name, rfc822);
966 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
967 strcpy(&name[0], &name[1]);
969 strcpy(&name[0], &name[1]);
970 for (a = 0; name[a] != '\0'; ++a)
977 strcpy(user, rfc822);
979 // first get rid of anything in parens
980 stripout(user, '(', ')');
982 // if there's a set of angle brackets, strip it down to that
983 if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
984 stripallbut(user, '<', '>');
987 // strip anything to the left of a bang
988 while ((!IsEmptyStr(user)) && (haschar(user, '!') > 0))
989 strcpy(user, &user[1]);
991 // and anything to the right of a @ or %
992 for (a = 0; user[a] != '\0'; ++a) {
993 if (user[a] == '@') {
997 if (user[a] == '%') {
1004 // extract node name
1005 strcpy(node, rfc822);
1007 // first get rid of anything in parens
1008 stripout(node, '(', ')');
1010 // if there's a set of angle brackets, strip it down to that
1011 if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
1012 stripallbut(node, '<', '>');
1015 // If no node specified, tack ours on instead
1017 (haschar(node, '@')==0)
1018 && (haschar(node, '%')==0)
1019 && (haschar(node, '!')==0)
1021 strcpy(node, CtdlGetConfigStr("c_nodename"));
1025 // strip anything to the left of a @
1026 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0))
1027 strcpy(node, &node[1]);
1029 // strip anything to the left of a %
1030 while ((!IsEmptyStr(node)) && (haschar(node, '%') > 0))
1031 strcpy(node, &node[1]);
1033 // reduce multiple system bang paths to node!user
1034 while ((!IsEmptyStr(node)) && (haschar(node, '!') > 1))
1035 strcpy(node, &node[1]);
1037 // now get rid of the user portion of a node!user string
1038 for (a = 0; node[a] != '\0'; ++a)
1039 if (node[a] == '!') {
1045 // strip leading and trailing spaces in all strings
1050 // If we processed a string that had the address in angle brackets
1051 // but no name outside the brackets, we now have an empty name. In
1052 // this case, use the user portion of the address as the name.
1053 if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
1059 // convert_field() is a helper function for convert_internet_message().
1060 // Given start/end positions for an rfc822 field, it converts it to a Citadel
1061 // field if it wants to, and unfolds it if necessary.
1063 // Returns 1 if the field was converted and inserted into the Citadel message
1064 // structure, implying that the source field should be removed from the
1066 int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
1067 char *key, *value, *valueend;
1071 const char *colonpos = NULL;
1080 for (pos = end; pos >= beg; pos--) {
1081 if (*pos == ':') colonpos = pos;
1084 if (colonpos == NULL) return(0); /* no colon? not a valid header line */
1087 key = malloc(len + 2);
1088 memcpy(key, beg, len + 1);
1090 valueend = key + len;
1091 * ( key + (colonpos - beg) ) = '\0';
1092 value = &key[(colonpos - beg) + 1];
1093 // printf("Header: [%s]\nValue: [%s]\n", key, value);
1094 unfold_rfc822_field(&value, &valueend);
1095 valuelen = valueend - value + 1;
1096 // printf("UnfoldedValue: [%s]\n", value);
1098 // Here's the big rfc822-to-citadel loop.
1100 // Date/time is converted into a unix timestamp. If the conversion
1101 // fails, we replace it with the time the message arrived locally.
1102 if (!strcasecmp(key, "Date")) {
1103 parsed_date = parsedate(value);
1104 if (parsed_date < 0L) parsed_date = time(NULL);
1106 if (CM_IsEmpty(msg, eTimestamp))
1107 CM_SetFieldLONG(msg, eTimestamp, parsed_date);
1111 else if (!strcasecmp(key, "From")) {
1112 process_rfc822_addr(value, user, node, name);
1113 syslog(LOG_DEBUG, "internet_addressing: converted to <%s@%s> (%s)", user, node, name);
1114 snprintf(addr, sizeof(addr), "%s@%s", user, node);
1115 if (CM_IsEmpty(msg, eAuthor) && !IsEmptyStr(name)) {
1116 CM_SetField(msg, eAuthor, name, -1);
1118 if (CM_IsEmpty(msg, erFc822Addr) && !IsEmptyStr(addr)) {
1119 CM_SetField(msg, erFc822Addr, addr, -1);
1124 else if (!strcasecmp(key, "Subject")) {
1125 if (CM_IsEmpty(msg, eMsgSubject))
1126 CM_SetField(msg, eMsgSubject, value, valuelen);
1130 else if (!strcasecmp(key, "List-ID")) {
1131 if (CM_IsEmpty(msg, eListID))
1132 CM_SetField(msg, eListID, value, valuelen);
1136 else if (!strcasecmp(key, "To")) {
1137 if (CM_IsEmpty(msg, eRecipient))
1138 CM_SetField(msg, eRecipient, value, valuelen);
1142 else if (!strcasecmp(key, "CC")) {
1143 if (CM_IsEmpty(msg, eCarbonCopY))
1144 CM_SetField(msg, eCarbonCopY, value, valuelen);
1148 else if (!strcasecmp(key, "Message-ID")) {
1149 if (!CM_IsEmpty(msg, emessageId)) {
1150 syslog(LOG_WARNING, "internet_addressing: duplicate message id");
1157 pValueLen = valuelen;
1158 // Strip angle brackets
1159 while (haschar(pValue, '<') > 0) {
1164 for (i = 0; i <= pValueLen; ++i)
1165 if (pValue[i] == '>') {
1170 CM_SetField(msg, emessageId, pValue, pValueLen);
1176 else if (!strcasecmp(key, "Return-Path")) {
1177 if (CM_IsEmpty(msg, eMessagePath))
1178 CM_SetField(msg, eMessagePath, value, valuelen);
1182 else if (!strcasecmp(key, "Envelope-To")) {
1183 if (CM_IsEmpty(msg, eenVelopeTo))
1184 CM_SetField(msg, eenVelopeTo, value, valuelen);
1188 else if (!strcasecmp(key, "References")) {
1189 CM_SetField(msg, eWeferences, value, valuelen);
1193 else if (!strcasecmp(key, "Reply-To")) {
1194 CM_SetField(msg, eReplyTo, value, valuelen);
1198 else if (!strcasecmp(key, "In-reply-to")) {
1199 if (CM_IsEmpty(msg, eWeferences)) // References: supersedes In-reply-to:
1200 CM_SetField(msg, eWeferences, value, valuelen);
1206 // Clean up and move on.
1207 free(key); // Don't free 'value', it's actually the same buffer
1212 // Convert RFC822 references format (References) to Citadel references format (Weferences)
1213 void convert_references_to_wefewences(char *str) {
1214 int bracket_nesting = 0;
1216 char *moveptr = NULL;
1223 if (bracket_nesting < 0) bracket_nesting = 0;
1225 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
1229 else if (bracket_nesting > 0) {
1235 *moveptr = *(moveptr+1);
1239 if (ch == '<') ++bracket_nesting;
1245 // Convert an RFC822 message (headers + body) to a CtdlMessage structure.
1246 // NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
1247 // will be deallocated when CM_Free() is called. Therefore, the
1248 // supplied buffer should be DEREFERENCED. It should not be freed or used
1250 struct CtdlMessage *convert_internet_message(char *rfc822) {
1251 StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
1253 return convert_internet_message_buf(&RFCBuf);
1257 struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822)
1259 struct CtdlMessage *msg;
1260 const char *pos, *beg, *end, *totalend;
1261 int done, alldone = 0;
1263 StrBuf *OtherHeaders;
1265 msg = malloc(sizeof(struct CtdlMessage));
1266 if (msg == NULL) return msg;
1268 memset(msg, 0, sizeof(struct CtdlMessage));
1269 msg->cm_magic = CTDLMESSAGE_MAGIC; // self check
1270 msg->cm_anon_type = 0; // never anonymous
1271 msg->cm_format_type = FMT_RFC822; // internet message
1273 pos = ChrPtr(*rfc822);
1274 totalend = pos + StrLength(*rfc822);
1276 OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
1280 /* Locate beginning and end of field, keeping in mind that
1281 * some fields might be multiline
1285 while ((end < totalend) &&
1290 if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) )
1295 /* done with headers? */
1297 ( (*(pos+1)=='\n') ||
1303 if (pos >= (totalend - 1) )
1313 /* At this point we have a field. Are we interested in it? */
1314 converted = convert_field(msg, beg, end);
1316 /* Strip the field out of the RFC822 header if we used it */
1318 StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
1319 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1322 /* If we've hit the end of the message, bail out */
1323 if (pos >= totalend)
1326 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1328 StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
1330 CM_SetAsFieldSB(msg, eMesageText, &OtherHeaders);
1332 /* Follow-up sanity checks... */
1334 /* If there's no timestamp on this message, set it to now. */
1335 if (CM_IsEmpty(msg, eTimestamp)) {
1336 CM_SetFieldLONG(msg, eTimestamp, time(NULL));
1339 /* If a W (references, or rather, Wefewences) field is present, we
1340 * have to convert it from RFC822 format to Citadel format.
1342 if (!CM_IsEmpty(msg, eWeferences)) {
1344 convert_references_to_wefewences(msg->cm_fields[eWeferences]);
1352 * Look for a particular header field in an RFC822 message text. If the
1353 * requested field is found, it is unfolded (if necessary) and returned to
1354 * the caller. The field name is stripped out, leaving only its contents.
1355 * The caller is responsible for freeing the returned buffer. If the requested
1356 * field is not present, or anything else goes wrong, it returns NULL.
1358 char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
1359 char *fieldbuf = NULL;
1360 const char *end_of_headers;
1361 const char *field_start;
1366 /* Should never happen, but sometimes we get stupid */
1367 if (rfc822 == NULL) return(NULL);
1368 if (fieldname == NULL) return(NULL);
1370 snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
1372 /* Locate the end of the headers, so we don't run past that point */
1373 end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
1374 if (end_of_headers == NULL) {
1375 end_of_headers = cbmstrcasestr(rfc822, "\n\n");
1377 if (end_of_headers == NULL) return (NULL);
1379 field_start = cbmstrcasestr(rfc822, fieldhdr);
1380 if (field_start == NULL) return(NULL);
1381 if (field_start > end_of_headers) return(NULL);
1383 fieldbuf = malloc(SIZ);
1384 strcpy(fieldbuf, "");
1387 ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
1388 while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
1389 strcat(fieldbuf, " ");
1390 cont = &fieldbuf[strlen(fieldbuf)];
1391 ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
1395 strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
1402 /*****************************************************************************
1403 * DIRECTORY MANAGEMENT FUNCTIONS *
1404 *****************************************************************************/
1407 * Generate the index key for an Internet e-mail address to be looked up
1410 void directory_key(char *key, char *addr) {
1414 for (i=0; !IsEmptyStr(&addr[i]); ++i) {
1415 if (!isspace(addr[i])) {
1416 key[keylen++] = tolower(addr[i]);
1421 syslog(LOG_DEBUG, "internet_addressing: directory key is <%s>", key);
1426 * Return nonzero if the supplied address is in one of "our" domains
1428 int IsDirectory(char *addr, int allow_masq_domains) {
1432 extract_token(domain, addr, 1, '@', sizeof domain);
1435 h = CtdlHostAlias(domain);
1437 if ( (h == hostalias_masq) && allow_masq_domains)
1440 if (h == hostalias_localhost) {
1450 * Add an Internet e-mail address to the directory for a user
1452 int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
1455 if (IsDirectory(internet_addr, 0) == 0) {
1458 syslog(LOG_DEBUG, "internet_addressing: create directory entry: %s --> %s", internet_addr, citadel_addr);
1459 directory_key(key, internet_addr);
1460 cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
1466 * Delete an Internet e-mail address from the directory.
1468 * (NOTE: we don't actually use or need the citadel_addr variable; it's merely
1469 * here because the callback API expects to be able to send it.)
1471 int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
1474 syslog(LOG_DEBUG, "internet_addressing: delete directory entry: %s --> %s", internet_addr, citadel_addr);
1475 directory_key(key, internet_addr);
1476 return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
1481 * Look up an Internet e-mail address in the directory.
1482 * On success: returns 0, and Citadel address stored in 'target'
1483 * On failure: returns nonzero
1485 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
1486 struct cdbdata *cdbrec;
1489 /* Dump it in there unchanged, just for kicks */
1490 if (target != NULL) {
1491 safestrncpy(target, internet_addr, targbuflen);
1494 /* Only do lookups for addresses with hostnames in them */
1495 if (num_tokens(internet_addr, '@') != 2) return(-1);
1497 /* Only do lookups for domains in the directory */
1498 if (IsDirectory(internet_addr, 0) == 0) return(-1);
1500 directory_key(key, internet_addr);
1501 cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key) );
1502 if (cdbrec != NULL) {
1503 if (target != NULL) {
1504 safestrncpy(target, cdbrec->ptr, targbuflen);
1515 * Harvest any email addresses that someone might want to have in their
1516 * "collected addresses" book.
1518 char *harvest_collected_addresses(struct CtdlMessage *msg) {
1521 char user[256], node[256], name[256];
1524 eMsgField field = 0;
1526 if (msg == NULL) return(NULL);
1530 if (!CM_IsEmpty(msg, eAuthor)) {
1531 strcat(addr, msg->cm_fields[eAuthor]);
1533 if (!CM_IsEmpty(msg, erFc822Addr)) {
1535 strcat(addr, msg->cm_fields[erFc822Addr]);
1537 if (IsDirectory(msg->cm_fields[erFc822Addr], 0)) {
1542 if (is_harvestable) {
1543 coll = strdup(addr);
1549 if (coll == NULL) return(NULL);
1551 /* Scan both the R (To) and Y (CC) fields */
1552 for (i = 0; i < 2; ++i) {
1553 if (i == 0) field = eRecipient;
1554 if (i == 1) field = eCarbonCopY;
1556 if (!CM_IsEmpty(msg, field)) {
1557 for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
1558 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
1559 if (strstr(addr, "=?") != NULL)
1560 utf8ify_rfc822_string(addr);
1561 process_rfc822_addr(addr, user, node, name);
1562 h = CtdlHostAlias(node);
1563 if (h != hostalias_localhost) {
1564 coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1565 if (coll == NULL) return(NULL);
1566 if (!IsEmptyStr(coll)) {
1576 if (IsEmptyStr(coll)) {
1585 * Helper function for CtdlRebuildDirectoryIndex()
1587 void CtdlRebuildDirectoryIndex_backend(char *username, void *data) {
1590 struct ctdluser usbuf;
1592 if (CtdlGetUser(&usbuf, username) != 0) {
1596 if ( (!IsEmptyStr(usbuf.fullname)) && (!IsEmptyStr(usbuf.emailaddrs)) ) {
1597 for (j=0; j<num_tokens(usbuf.emailaddrs, '|'); ++j) {
1598 char one_email[512];
1599 extract_token(one_email, usbuf.emailaddrs, j, '|', sizeof one_email);
1600 CtdlDirectoryAddUser(one_email, usbuf.fullname);
1607 * Initialize the directory database (erasing anything already there)
1609 void CtdlRebuildDirectoryIndex(void) {
1610 syslog(LOG_INFO, "internet_addressing: rebuilding email address directory index");
1611 cdb_trunc(CDB_DIRECTORY);
1612 ForEachUser(CtdlRebuildDirectoryIndex_backend, NULL);
1617 * Configure Internet email addresses for a user account, updating the Directory Index in the process
1619 void CtdlSetEmailAddressesForUser(char *requested_user, char *new_emailaddrs)
1621 struct ctdluser usbuf;
1625 if (CtdlGetUserLock(&usbuf, requested_user) != 0) { // We are relying on the fact that the DirectoryIndex functions don't lock.
1626 return; // Silently fail here if we can't acquire a lock on the user record.
1629 syslog(LOG_DEBUG, "internet_addressing: setting email addresses for <%s> to <%s>", usbuf.fullname, new_emailaddrs);
1631 /* Delete all of the existing directory index records for the user (easier this way) */
1632 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1633 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1634 CtdlDirectoryDelUser(buf, requested_user);
1637 strcpy(usbuf.emailaddrs, new_emailaddrs); // make it official.
1639 /* Index all of the new email addresses (they've already been sanitized) */
1640 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1641 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1642 CtdlDirectoryAddUser(buf, requested_user);
1645 CtdlPutUserLock(&usbuf);
1650 * Auto-generate an Internet email address for a user account
1652 void AutoGenerateEmailAddressForUser(struct ctdluser *user)
1654 char synthetic_email_addr[1024];
1658 for (i=0; u==0; ++i) {
1660 // first try just converting the user name to lowercase and replacing spaces with underscores
1661 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "%s@%s", user->fullname, CtdlGetConfigStr("c_fqdn"));
1662 for (j=0; ((synthetic_email_addr[j] != '\0')&&(synthetic_email_addr[j] != '@')); j++) {
1663 synthetic_email_addr[j] = tolower(synthetic_email_addr[j]);
1664 if (!isalnum(synthetic_email_addr[j])) {
1665 synthetic_email_addr[j] = '_';
1670 // then try 'ctdl' followed by the user number
1671 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08lx@%s", user->usernum, CtdlGetConfigStr("c_fqdn"));
1674 // oof. just keep trying other numbers until we find one
1675 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08x@%s", i, CtdlGetConfigStr("c_fqdn"));
1677 u = CtdlDirectoryLookup(NULL, synthetic_email_addr, 0);
1678 syslog(LOG_DEBUG, "user_ops: address <%s> lookup returned <%d>", synthetic_email_addr, u);
1681 CtdlSetEmailAddressesForUser(user->fullname, synthetic_email_addr);
1682 strncpy(CC->user.emailaddrs, synthetic_email_addr, sizeof(user->emailaddrs));
1683 syslog(LOG_DEBUG, "user_ops: auto-generated email address <%s> for <%s>", synthetic_email_addr, user->fullname);