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
402 * Aliasing for network mail.
404 int expand_aliases(char *name) { /* process alias and routing info for mail */
413 // FIXME write a "real" alias table here
416 // temporary test of expansion
417 if (!strcasecmp(name, "root")) {
418 strcpy(name, "root");
421 if (!strcasecmp(name, "qux")) {
422 strcpy(name, "eggroll,blat,fun@eek.boop");
430 char original_name[256];
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: %s is being forwarded 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: changed to <%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 tempQR;
539 struct ctdlroom tempQR2;
545 ret = (struct recptypes *) malloc(sizeof(struct recptypes)); // Initialize
546 if (ret == NULL) return(NULL);
547 memset(ret, 0, sizeof(struct recptypes)); // set all values to null/zero
549 if (supplied_recipients == NULL) {
550 recipients = strdup("");
553 recipients = strdup(supplied_recipients);
556 len = strlen(recipients) + 1024; // allocate memory
557 ret->errormsg = malloc(len);
558 ret->recp_local = malloc(len);
559 ret->recp_internet = malloc(len);
560 ret->recp_room = malloc(len);
561 ret->display_recp = malloc(len);
562 ret->recp_orgroom = malloc(len);
564 ret->errormsg[0] = 0;
565 ret->recp_local[0] = 0;
566 ret->recp_internet[0] = 0;
567 ret->recp_room[0] = 0;
568 ret->recp_orgroom[0] = 0;
569 ret->display_recp[0] = 0;
570 ret->recptypes_magic = RECPTYPES_MAGIC;
572 Array *recp_array = split_recps(supplied_recipients);
573 int original_array_len = array_len(recp_array);
574 for (int r=0; r<array_len(recp_array); ++r) {
575 org_recp = (char *)array_get_element_at(recp_array, r);
576 strncpy(this_recp, org_recp, sizeof this_recp);
578 mailtype = expand_aliases(this_recp);
580 // If an alias expanded to multiple recipients, strip off those recipients and append them
581 // to the end of the array. This loop will hit those again when it gets there.
582 // Note that we don't do this after we get past the *original* array length, to avoid aliasing loops.
583 if (mailtype == EA_MULTIPLE) {
584 if (r < original_array_len) {
586 while ((comma = strrchr(this_recp, ','))) {
588 array_append(recp_array, &comma[1]);
589 strcpy(org_recp, this_recp);
597 mailtype = expand_aliases(this_recp); // do it ONCE again to handle alias expansions
598 if (mailtype == EA_MULTIPLE) {
599 mailtype = EA_ERROR; // and fail if it wants to expand a second time
606 if (!strcasecmp(this_recp, "sysop")) {
608 strcpy(this_recp, CtdlGetConfigStr("c_aideroom"));
609 if (!IsEmptyStr(ret->recp_room)) {
610 strcat(ret->recp_room, "|");
612 strcat(ret->recp_room, this_recp);
614 else if ( (!strncasecmp(this_recp, "room_", 5)) && (!CtdlGetRoom(&tempQR, &this_recp[5])) ) {
616 // FIXME -- handle the underscores here, strip them out for a room search.
618 tempQR2 = CC->room; // Remember where we parked
621 err = CtdlDoIHavePermissionToPostInThisRoom( // check for write permissions to room
626 0 // 0 means "not a reply"
634 if (!IsEmptyStr(ret->recp_room)) {
635 strcat(ret->recp_room, "|");
637 strcat(ret->recp_room, &this_recp[5]);
639 if (!IsEmptyStr(ret->recp_orgroom)) {
640 strcat(ret->recp_orgroom, "|");
642 strcat(ret->recp_orgroom, org_recp);
646 /* Restore room in case something needs it */
650 else if (CtdlGetUser(&tempUS, this_recp) == 0) {
652 strcpy(this_recp, tempUS.fullname);
653 if (!IsEmptyStr(ret->recp_local)) {
654 strcat(ret->recp_local, "|");
656 strcat(ret->recp_local, this_recp);
664 // Yes, you're reading this correctly: if the target domain points back to the local system,
665 // the address is invalid. That's because if the address were valid, we would have
666 // already translated it to a local address by now.
667 if (IsDirectory(this_recp, 0)) {
673 if (!IsEmptyStr(ret->recp_internet)) {
674 strcat(ret->recp_internet, "|");
676 strcat(ret->recp_internet, this_recp);
685 if (IsEmptyStr(errmsg)) {
686 snprintf(append, sizeof append, "Invalid recipient: %s", this_recp);
689 snprintf(append, sizeof append, "%s", errmsg);
691 if ( (strlen(ret->errormsg) + strlen(append) + 3) < SIZ) {
692 if (!IsEmptyStr(ret->errormsg)) {
693 strcat(ret->errormsg, "; ");
695 strcat(ret->errormsg, append);
699 if (IsEmptyStr(ret->display_recp)) {
700 strcpy(append, this_recp);
703 snprintf(append, sizeof append, ", %s", this_recp);
705 if ( (strlen(ret->display_recp)+strlen(append)) < SIZ) {
706 strcat(ret->display_recp, append);
709 syslog(LOG_DEBUG, "org_recp: \033[31m%-30s\033[0m this_recp: \033[32m%-30s\033[0m mailtype: %s", org_recp, this_recp, killo[mailtype]);
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
722 array_free(recp_array);
729 * 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]] = ',';
871 * Unfold a multi-line field into a single line, removing multi-whitespaces
873 void unfold_rfc822_field(char **field, char **FieldEnd)
876 char *pField = *field;
878 char *pFieldEnd = *FieldEnd;
880 while (isspace(*pField))
882 /* remove leading/trailing whitespace */
885 while (isspace(*pFieldEnd))
888 *FieldEnd = pFieldEnd;
889 /* convert non-space whitespace to spaces, and remove double blanks */
890 for (sField = *field = pField;
894 if ((*sField=='\r') || (*sField=='\n'))
897 while ( ( (*(sField + offset) == '\r') || (*(sField + offset) == '\n' )) && (sField + offset < pFieldEnd) ) {
904 if (*sField=='\"') quote = 1 - quote;
906 if (isspace(*sField)) {
911 while ((sField < pFieldEnd) &&
916 else *pField = *sField;
918 else *pField = *sField;
922 *FieldEnd = pField - 1;
927 * Split an RFC822-style address into userid, host, and full name
930 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name) {
934 strcpy(node, CtdlGetConfigStr("c_fqdn"));
937 if (rfc822 == NULL) return;
939 /* extract full name - first, it's From minus <userid> */
940 strcpy(name, rfc822);
941 stripout(name, '<', '>');
943 /* strip anything to the left of a bang */
944 while ((!IsEmptyStr(name)) && (haschar(name, '!') > 0))
945 strcpy(name, &name[1]);
947 /* and anything to the right of a @ or % */
948 for (a = 0; name[a] != '\0'; ++a) {
949 if (name[a] == '@') {
953 if (name[a] == '%') {
959 /* but if there are parentheses, that changes the rules... */
960 if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
961 strcpy(name, rfc822);
962 stripallbut(name, '(', ')');
965 /* but if there are a set of quotes, that supersedes everything */
966 if (haschar(rfc822, 34) == 2) {
967 strcpy(name, rfc822);
968 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
969 strcpy(&name[0], &name[1]);
971 strcpy(&name[0], &name[1]);
972 for (a = 0; name[a] != '\0'; ++a)
978 /* extract user id */
979 strcpy(user, rfc822);
981 /* first get rid of anything in parens */
982 stripout(user, '(', ')');
984 /* if there's a set of angle brackets, strip it down to that */
985 if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
986 stripallbut(user, '<', '>');
989 /* strip anything to the left of a bang */
990 while ((!IsEmptyStr(user)) && (haschar(user, '!') > 0))
991 strcpy(user, &user[1]);
993 /* and anything to the right of a @ or % */
994 for (a = 0; user[a] != '\0'; ++a) {
995 if (user[a] == '@') {
999 if (user[a] == '%') {
1006 /* extract node name */
1007 strcpy(node, rfc822);
1009 /* first get rid of anything in parens */
1010 stripout(node, '(', ')');
1012 /* if there's a set of angle brackets, strip it down to that */
1013 if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
1014 stripallbut(node, '<', '>');
1017 /* If no node specified, tack ours on instead */
1019 (haschar(node, '@')==0)
1020 && (haschar(node, '%')==0)
1021 && (haschar(node, '!')==0)
1023 strcpy(node, CtdlGetConfigStr("c_nodename"));
1027 /* strip anything to the left of a @ */
1028 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0))
1029 strcpy(node, &node[1]);
1031 /* strip anything to the left of a % */
1032 while ((!IsEmptyStr(node)) && (haschar(node, '%') > 0))
1033 strcpy(node, &node[1]);
1035 /* reduce multiple system bang paths to node!user */
1036 while ((!IsEmptyStr(node)) && (haschar(node, '!') > 1))
1037 strcpy(node, &node[1]);
1039 /* now get rid of the user portion of a node!user string */
1040 for (a = 0; node[a] != '\0'; ++a)
1041 if (node[a] == '!') {
1047 /* strip leading and trailing spaces in all strings */
1052 /* If we processed a string that had the address in angle brackets
1053 * but no name outside the brackets, we now have an empty name. In
1054 * this case, use the user portion of the address as the name.
1056 if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
1063 * convert_field() is a helper function for convert_internet_message().
1064 * Given start/end positions for an rfc822 field, it converts it to a Citadel
1065 * field if it wants to, and unfolds it if necessary.
1067 * Returns 1 if the field was converted and inserted into the Citadel message
1068 * structure, implying that the source field should be removed from the
1071 int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
1072 char *key, *value, *valueend;
1076 const char *colonpos = NULL;
1085 for (pos = end; pos >= beg; pos--) {
1086 if (*pos == ':') colonpos = pos;
1089 if (colonpos == NULL) return(0); /* no colon? not a valid header line */
1092 key = malloc(len + 2);
1093 memcpy(key, beg, len + 1);
1095 valueend = key + len;
1096 * ( key + (colonpos - beg) ) = '\0';
1097 value = &key[(colonpos - beg) + 1];
1098 /* printf("Header: [%s]\nValue: [%s]\n", key, value); */
1099 unfold_rfc822_field(&value, &valueend);
1100 valuelen = valueend - value + 1;
1101 /* printf("UnfoldedValue: [%s]\n", value); */
1104 * Here's the big rfc822-to-citadel loop.
1107 /* Date/time is converted into a unix timestamp. If the conversion
1108 * fails, we replace it with the time the message arrived locally.
1110 if (!strcasecmp(key, "Date")) {
1111 parsed_date = parsedate(value);
1112 if (parsed_date < 0L) parsed_date = time(NULL);
1114 if (CM_IsEmpty(msg, eTimestamp))
1115 CM_SetFieldLONG(msg, eTimestamp, parsed_date);
1119 else if (!strcasecmp(key, "From")) {
1120 process_rfc822_addr(value, user, node, name);
1121 syslog(LOG_DEBUG, "internet_addressing: converted to <%s@%s> (%s)", user, node, name);
1122 snprintf(addr, sizeof(addr), "%s@%s", user, node);
1123 if (CM_IsEmpty(msg, eAuthor) && !IsEmptyStr(name)) {
1124 CM_SetField(msg, eAuthor, name, -1);
1126 if (CM_IsEmpty(msg, erFc822Addr) && !IsEmptyStr(addr)) {
1127 CM_SetField(msg, erFc822Addr, addr, -1);
1132 else if (!strcasecmp(key, "Subject")) {
1133 if (CM_IsEmpty(msg, eMsgSubject))
1134 CM_SetField(msg, eMsgSubject, value, valuelen);
1138 else if (!strcasecmp(key, "List-ID")) {
1139 if (CM_IsEmpty(msg, eListID))
1140 CM_SetField(msg, eListID, value, valuelen);
1144 else if (!strcasecmp(key, "To")) {
1145 if (CM_IsEmpty(msg, eRecipient))
1146 CM_SetField(msg, eRecipient, value, valuelen);
1150 else if (!strcasecmp(key, "CC")) {
1151 if (CM_IsEmpty(msg, eCarbonCopY))
1152 CM_SetField(msg, eCarbonCopY, value, valuelen);
1156 else if (!strcasecmp(key, "Message-ID")) {
1157 if (!CM_IsEmpty(msg, emessageId)) {
1158 syslog(LOG_WARNING, "internet_addressing: duplicate message id");
1165 pValueLen = valuelen;
1166 /* Strip angle brackets */
1167 while (haschar(pValue, '<') > 0) {
1172 for (i = 0; i <= pValueLen; ++i)
1173 if (pValue[i] == '>') {
1178 CM_SetField(msg, emessageId, pValue, pValueLen);
1184 else if (!strcasecmp(key, "Return-Path")) {
1185 if (CM_IsEmpty(msg, eMessagePath))
1186 CM_SetField(msg, eMessagePath, value, valuelen);
1190 else if (!strcasecmp(key, "Envelope-To")) {
1191 if (CM_IsEmpty(msg, eenVelopeTo))
1192 CM_SetField(msg, eenVelopeTo, value, valuelen);
1196 else if (!strcasecmp(key, "References")) {
1197 CM_SetField(msg, eWeferences, value, valuelen);
1201 else if (!strcasecmp(key, "Reply-To")) {
1202 CM_SetField(msg, eReplyTo, value, valuelen);
1206 else if (!strcasecmp(key, "In-reply-to")) {
1207 if (CM_IsEmpty(msg, eWeferences)) /* References: supersedes In-reply-to: */
1208 CM_SetField(msg, eWeferences, value, valuelen);
1214 /* Clean up and move on. */
1215 free(key); /* Don't free 'value', it's actually the same buffer */
1221 * Convert RFC822 references format (References) to Citadel references format (Weferences)
1223 void convert_references_to_wefewences(char *str) {
1224 int bracket_nesting = 0;
1226 char *moveptr = NULL;
1233 if (bracket_nesting < 0) bracket_nesting = 0;
1235 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
1239 else if (bracket_nesting > 0) {
1245 *moveptr = *(moveptr+1);
1249 if (ch == '<') ++bracket_nesting;
1256 * Convert an RFC822 message (headers + body) to a CtdlMessage structure.
1257 * NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
1258 * will be deallocated when CM_Free() is called. Therefore, the
1259 * supplied buffer should be DEREFERENCED. It should not be freed or used
1262 struct CtdlMessage *convert_internet_message(char *rfc822) {
1263 StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
1265 return convert_internet_message_buf(&RFCBuf);
1269 struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822)
1271 struct CtdlMessage *msg;
1272 const char *pos, *beg, *end, *totalend;
1273 int done, alldone = 0;
1275 StrBuf *OtherHeaders;
1277 msg = malloc(sizeof(struct CtdlMessage));
1278 if (msg == NULL) return msg;
1280 memset(msg, 0, sizeof(struct CtdlMessage));
1281 msg->cm_magic = CTDLMESSAGE_MAGIC; /* self check */
1282 msg->cm_anon_type = 0; /* never anonymous */
1283 msg->cm_format_type = FMT_RFC822; /* internet message */
1285 pos = ChrPtr(*rfc822);
1286 totalend = pos + StrLength(*rfc822);
1288 OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
1292 /* Locate beginning and end of field, keeping in mind that
1293 * some fields might be multiline
1297 while ((end < totalend) &&
1302 if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) )
1307 /* done with headers? */
1309 ( (*(pos+1)=='\n') ||
1315 if (pos >= (totalend - 1) )
1325 /* At this point we have a field. Are we interested in it? */
1326 converted = convert_field(msg, beg, end);
1328 /* Strip the field out of the RFC822 header if we used it */
1330 StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
1331 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1334 /* If we've hit the end of the message, bail out */
1335 if (pos >= totalend)
1338 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1340 StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
1342 CM_SetAsFieldSB(msg, eMesageText, &OtherHeaders);
1344 /* Follow-up sanity checks... */
1346 /* If there's no timestamp on this message, set it to now. */
1347 if (CM_IsEmpty(msg, eTimestamp)) {
1348 CM_SetFieldLONG(msg, eTimestamp, time(NULL));
1351 /* If a W (references, or rather, Wefewences) field is present, we
1352 * have to convert it from RFC822 format to Citadel format.
1354 if (!CM_IsEmpty(msg, eWeferences)) {
1356 convert_references_to_wefewences(msg->cm_fields[eWeferences]);
1364 * Look for a particular header field in an RFC822 message text. If the
1365 * requested field is found, it is unfolded (if necessary) and returned to
1366 * the caller. The field name is stripped out, leaving only its contents.
1367 * The caller is responsible for freeing the returned buffer. If the requested
1368 * field is not present, or anything else goes wrong, it returns NULL.
1370 char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
1371 char *fieldbuf = NULL;
1372 const char *end_of_headers;
1373 const char *field_start;
1378 /* Should never happen, but sometimes we get stupid */
1379 if (rfc822 == NULL) return(NULL);
1380 if (fieldname == NULL) return(NULL);
1382 snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
1384 /* Locate the end of the headers, so we don't run past that point */
1385 end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
1386 if (end_of_headers == NULL) {
1387 end_of_headers = cbmstrcasestr(rfc822, "\n\n");
1389 if (end_of_headers == NULL) return (NULL);
1391 field_start = cbmstrcasestr(rfc822, fieldhdr);
1392 if (field_start == NULL) return(NULL);
1393 if (field_start > end_of_headers) return(NULL);
1395 fieldbuf = malloc(SIZ);
1396 strcpy(fieldbuf, "");
1399 ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
1400 while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
1401 strcat(fieldbuf, " ");
1402 cont = &fieldbuf[strlen(fieldbuf)];
1403 ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
1407 strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
1414 /*****************************************************************************
1415 * DIRECTORY MANAGEMENT FUNCTIONS *
1416 *****************************************************************************/
1419 * Generate the index key for an Internet e-mail address to be looked up
1422 void directory_key(char *key, char *addr) {
1426 for (i=0; !IsEmptyStr(&addr[i]); ++i) {
1427 if (!isspace(addr[i])) {
1428 key[keylen++] = tolower(addr[i]);
1433 syslog(LOG_DEBUG, "internet_addressing: directory key is <%s>", key);
1438 * Return nonzero if the supplied address is in one of "our" domains
1440 int IsDirectory(char *addr, int allow_masq_domains) {
1444 extract_token(domain, addr, 1, '@', sizeof domain);
1447 h = CtdlHostAlias(domain);
1449 if ( (h == hostalias_masq) && allow_masq_domains)
1452 if (h == hostalias_localhost) {
1462 * Add an Internet e-mail address to the directory for a user
1464 int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
1467 if (IsDirectory(internet_addr, 0) == 0) {
1470 syslog(LOG_DEBUG, "internet_addressing: create directory entry: %s --> %s", internet_addr, citadel_addr);
1471 directory_key(key, internet_addr);
1472 cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
1478 * Delete an Internet e-mail address from the directory.
1480 * (NOTE: we don't actually use or need the citadel_addr variable; it's merely
1481 * here because the callback API expects to be able to send it.)
1483 int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
1486 syslog(LOG_DEBUG, "internet_addressing: delete directory entry: %s --> %s", internet_addr, citadel_addr);
1487 directory_key(key, internet_addr);
1488 return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
1493 * Look up an Internet e-mail address in the directory.
1494 * On success: returns 0, and Citadel address stored in 'target'
1495 * On failure: returns nonzero
1497 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
1498 struct cdbdata *cdbrec;
1501 /* Dump it in there unchanged, just for kicks */
1502 if (target != NULL) {
1503 safestrncpy(target, internet_addr, targbuflen);
1506 /* Only do lookups for addresses with hostnames in them */
1507 if (num_tokens(internet_addr, '@') != 2) return(-1);
1509 /* Only do lookups for domains in the directory */
1510 if (IsDirectory(internet_addr, 0) == 0) return(-1);
1512 directory_key(key, internet_addr);
1513 cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key) );
1514 if (cdbrec != NULL) {
1515 if (target != NULL) {
1516 safestrncpy(target, cdbrec->ptr, targbuflen);
1527 * Harvest any email addresses that someone might want to have in their
1528 * "collected addresses" book.
1530 char *harvest_collected_addresses(struct CtdlMessage *msg) {
1533 char user[256], node[256], name[256];
1536 eMsgField field = 0;
1538 if (msg == NULL) return(NULL);
1542 if (!CM_IsEmpty(msg, eAuthor)) {
1543 strcat(addr, msg->cm_fields[eAuthor]);
1545 if (!CM_IsEmpty(msg, erFc822Addr)) {
1547 strcat(addr, msg->cm_fields[erFc822Addr]);
1549 if (IsDirectory(msg->cm_fields[erFc822Addr], 0)) {
1554 if (is_harvestable) {
1555 coll = strdup(addr);
1561 if (coll == NULL) return(NULL);
1563 /* Scan both the R (To) and Y (CC) fields */
1564 for (i = 0; i < 2; ++i) {
1565 if (i == 0) field = eRecipient;
1566 if (i == 1) field = eCarbonCopY;
1568 if (!CM_IsEmpty(msg, field)) {
1569 for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
1570 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
1571 if (strstr(addr, "=?") != NULL)
1572 utf8ify_rfc822_string(addr);
1573 process_rfc822_addr(addr, user, node, name);
1574 h = CtdlHostAlias(node);
1575 if (h != hostalias_localhost) {
1576 coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1577 if (coll == NULL) return(NULL);
1578 if (!IsEmptyStr(coll)) {
1588 if (IsEmptyStr(coll)) {
1597 * Helper function for CtdlRebuildDirectoryIndex()
1599 void CtdlRebuildDirectoryIndex_backend(char *username, void *data) {
1602 struct ctdluser usbuf;
1604 if (CtdlGetUser(&usbuf, username) != 0) {
1608 if ( (!IsEmptyStr(usbuf.fullname)) && (!IsEmptyStr(usbuf.emailaddrs)) ) {
1609 for (j=0; j<num_tokens(usbuf.emailaddrs, '|'); ++j) {
1610 char one_email[512];
1611 extract_token(one_email, usbuf.emailaddrs, j, '|', sizeof one_email);
1612 CtdlDirectoryAddUser(one_email, usbuf.fullname);
1619 * Initialize the directory database (erasing anything already there)
1621 void CtdlRebuildDirectoryIndex(void) {
1622 syslog(LOG_INFO, "internet_addressing: rebuilding email address directory index");
1623 cdb_trunc(CDB_DIRECTORY);
1624 ForEachUser(CtdlRebuildDirectoryIndex_backend, NULL);
1629 * Configure Internet email addresses for a user account, updating the Directory Index in the process
1631 void CtdlSetEmailAddressesForUser(char *requested_user, char *new_emailaddrs)
1633 struct ctdluser usbuf;
1637 if (CtdlGetUserLock(&usbuf, requested_user) != 0) { // We are relying on the fact that the DirectoryIndex functions don't lock.
1638 return; // Silently fail here if we can't acquire a lock on the user record.
1641 syslog(LOG_DEBUG, "internet_addressing: setting email addresses for <%s> to <%s>", usbuf.fullname, new_emailaddrs);
1643 /* Delete all of the existing directory index records for the user (easier this way) */
1644 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1645 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1646 CtdlDirectoryDelUser(buf, requested_user);
1649 strcpy(usbuf.emailaddrs, new_emailaddrs); // make it official.
1651 /* Index all of the new email addresses (they've already been sanitized) */
1652 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1653 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1654 CtdlDirectoryAddUser(buf, requested_user);
1657 CtdlPutUserLock(&usbuf);
1662 * Auto-generate an Internet email address for a user account
1664 void AutoGenerateEmailAddressForUser(struct ctdluser *user)
1666 char synthetic_email_addr[1024];
1670 for (i=0; u==0; ++i) {
1672 // first try just converting the user name to lowercase and replacing spaces with underscores
1673 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "%s@%s", user->fullname, CtdlGetConfigStr("c_fqdn"));
1674 for (j=0; ((synthetic_email_addr[j] != '\0')&&(synthetic_email_addr[j] != '@')); j++) {
1675 synthetic_email_addr[j] = tolower(synthetic_email_addr[j]);
1676 if (!isalnum(synthetic_email_addr[j])) {
1677 synthetic_email_addr[j] = '_';
1682 // then try 'ctdl' followed by the user number
1683 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08lx@%s", user->usernum, CtdlGetConfigStr("c_fqdn"));
1686 // oof. just keep trying other numbers until we find one
1687 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08x@%s", i, CtdlGetConfigStr("c_fqdn"));
1689 u = CtdlDirectoryLookup(NULL, synthetic_email_addr, 0);
1690 syslog(LOG_DEBUG, "user_ops: address <%s> lookup returned <%d>", synthetic_email_addr, u);
1693 CtdlSetEmailAddressesForUser(user->fullname, synthetic_email_addr);
1694 strncpy(CC->user.emailaddrs, synthetic_email_addr, sizeof(user->emailaddrs));
1695 syslog(LOG_DEBUG, "user_ops: auto-generated email address <%s> for <%s>", synthetic_email_addr, user->fullname);