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
178 start = strstr(buf, "=?");
179 FindNextEnd((start != NULL)? start : buf, end);
180 while (start != NULL && end != NULL && end > start) {
181 extract_token(charset, start, 1, '?', sizeof charset);
182 extract_token(encoding, start, 2, '?', sizeof encoding);
183 extract_token(istr, start, 3, '?', sizeof istr);
187 if (!strcasecmp(encoding, "B")) { // base64
188 ibuflen = CtdlDecodeBase64(ibuf, istr, strlen(istr));
190 else if (!strcasecmp(encoding, "Q")) { // quoted-printable
197 if (istr[pos] == '_') istr[pos] = ' ';
200 ibuflen = CtdlDecodeQuotedPrintable(ibuf, istr, len);
203 strcpy(ibuf, istr); // unknown encoding
204 ibuflen = strlen(istr);
207 ctdl_iconv_open("UTF-8", charset, &ic);
208 if (ic != (iconv_t)(-1) ) {
210 obuf = (char *) malloc(obuflen);
212 iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
213 osav[1024-obuflen] = 0;
218 remove_token(end, 0, '?');
219 remove_token(end, 0, '?');
220 remove_token(end, 0, '?');
221 remove_token(end, 0, '?');
222 strcpy(end, &end[1]);
224 snprintf(newbuf, sizeof newbuf, "%s%s%s", buf, osav, end);
233 remove_token(end, 0, '?');
234 remove_token(end, 0, '?');
235 remove_token(end, 0, '?');
236 remove_token(end, 0, '?');
237 strcpy(end, &end[1]);
239 snprintf(newbuf, sizeof newbuf, "%s(unreadable)%s", buf, end);
246 * Since spammers will go to all sorts of absurd lengths to get their
247 * messages through, there are LOTS of corrupt headers out there.
248 * So, prevent a really badly formed RFC2047 header from throwing
249 * this function into an infinite loop.
252 if (passes > 20) return;
254 start = strstr(buf, "=?");
255 FindNextEnd((start != NULL)? start : buf, end);
260 inline void utf8ify_rfc822_string(char *a){};
270 char *inetcfg = NULL;
273 * Return nonzero if the supplied name is an alias for this host.
275 int CtdlHostAlias(char *fqdn) {
279 char host[256], type[256];
282 if (fqdn == NULL) return(hostalias_nomatch);
283 if (IsEmptyStr(fqdn)) return(hostalias_nomatch);
284 if (!strcasecmp(fqdn, "localhost")) return(hostalias_localhost);
285 if (!strcasecmp(fqdn, CtdlGetConfigStr("c_fqdn"))) return(hostalias_localhost);
286 if (!strcasecmp(fqdn, CtdlGetConfigStr("c_nodename"))) return(hostalias_localhost);
287 if (inetcfg == NULL) return(hostalias_nomatch);
289 config_lines = num_tokens(inetcfg, '\n');
290 for (i=0; i<config_lines; ++i) {
291 extract_token(buf, inetcfg, i, '\n', sizeof buf);
292 extract_token(host, buf, 0, '|', sizeof host);
293 extract_token(type, buf, 1, '|', sizeof type);
297 /* Process these in a specific order, in case there are multiple matches.
298 * We want localhost to override masq, for example.
301 if ( (!strcasecmp(type, "masqdomain")) && (!strcasecmp(fqdn, host))) {
302 found = hostalias_masq;
305 if ( (!strcasecmp(type, "localhost")) && (!strcasecmp(fqdn, host))) {
306 found = hostalias_localhost;
309 // "directory" used to be a distributed version of "localhost" but they're both the same now
310 if ( (!strcasecmp(type, "directory")) && (!strcasecmp(fqdn, host))) {
311 found = hostalias_localhost;
314 if (found) return(found);
316 return(hostalias_nomatch);
321 * Determine whether a given Internet address belongs to the current user
323 int CtdlIsMe(char *addr, int addr_buf_len)
325 struct recptypes *recp;
328 recp = validate_recipients(addr, NULL, 0);
329 if (recp == NULL) return(0);
331 if (recp->num_local == 0) {
332 free_recipients(recp);
336 for (i=0; i<recp->num_local; ++i) {
337 extract_token(addr, recp->recp_local, i, '|', addr_buf_len);
338 if (!strcasecmp(addr, CC->user.fullname)) {
339 free_recipients(recp);
344 free_recipients(recp);
349 /* If the last item in a list of recipients was truncated to a partial address,
350 * remove it completely in order to avoid choking library functions.
352 void sanitize_truncated_recipient(char *str)
355 if (num_tokens(str, ',') < 2) return;
357 int len = strlen(str);
358 if (len < 900) return;
359 if (len > 998) str[998] = 0;
361 char *cptr = strrchr(str, ',');
364 char *lptr = strchr(cptr, '<');
365 char *rptr = strchr(cptr, '>');
367 if ( (lptr) && (rptr) && (rptr > lptr) ) return;
374 * This function is self explanatory.
375 * (What can I say, I'm in a weird mood today...)
377 void remove_any_whitespace_to_the_left_or_right_of_at_symbol(char *name) {
380 for (i = 0; i < strlen(name); ++i) {
381 if (name[i] == '@') {
382 while (isspace(name[i - 1]) && i > 0) {
383 strcpy(&name[i - 1], &name[i]);
386 while (isspace(name[i + 1])) {
387 strcpy(&name[i + 1], &name[i + 2]);
395 * Aliasing for network mail.
397 int alias(char *name) { /* process alias and routing info for mail */
403 char original_name[256];
404 safestrncpy(original_name, name, sizeof original_name);
407 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
408 stripallbut(name, '<', '>');
410 /* Hit the email address directory */
411 if (CtdlDirectoryLookup(aaa, name, sizeof aaa) == 0) {
415 if (strcasecmp(original_name, name)) {
416 syslog(LOG_INFO, "internet_addressing: %s is being forwarded to %s", original_name, name);
419 /* Change "user @ xxx" to "user" if xxx is an alias for this host */
420 for (a=0; name[a] != '\0'; ++a) {
421 if (name[a] == '@') {
422 if (CtdlHostAlias(&name[a+1]) == hostalias_localhost) {
424 syslog(LOG_DEBUG, "internet_addressing: changed to <%s>", name);
430 /* determine local or remote type, see citadel.h */
431 at = haschar(name, '@');
432 if (at == 0) return(MES_LOCAL); /* no @'s - local address */
433 if (at > 1) return(MES_ERROR); /* >1 @'s - invalid address */
434 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
436 /* figure out the delivery mode */
437 extract_token(node, name, 1, '@', sizeof node);
439 /* If there are one or more dots in the nodename, we assume that it
440 * is an FQDN and will attempt SMTP delivery to the Internet.
442 if (haschar(node, '.') > 0) {
443 return(MES_INTERNET);
446 /* If we get to this point it's an invalid node name */
452 * Validate recipients, count delivery types and errors, and handle aliasing
453 * FIXME check for dupes!!!!!
455 * Returns 0 if all addresses are ok, ret->num_error = -1 if no addresses
456 * were specified, or the number of addresses found invalid.
458 * Caller needs to free the result using free_recipients()
460 struct recptypes *validate_recipients(const char *supplied_recipients, const char *RemoteIdentifier, int Flags) {
461 struct CitContext *CCC = CC;
462 struct recptypes *ret;
463 char *recipients = NULL;
466 char this_recp_cooked[256];
473 struct ctdluser tempUS;
474 struct ctdlroom tempQR;
475 struct ctdlroom tempQR2;
481 ret = (struct recptypes *) malloc(sizeof(struct recptypes));
482 if (ret == NULL) return(NULL);
484 /* Set all strings to null and numeric values to zero */
485 memset(ret, 0, sizeof(struct recptypes));
487 if (supplied_recipients == NULL) {
488 recipients = strdup("");
491 recipients = strdup(supplied_recipients);
494 /* Allocate some memory. Yes, this allocates 500% more memory than we will
495 * actually need, but it's healthier for the heap than doing lots of tiny
496 * realloc() calls instead.
498 len = strlen(recipients) + 1024;
499 ret->errormsg = malloc(len);
500 ret->recp_local = malloc(len);
501 ret->recp_internet = malloc(len);
502 ret->recp_room = malloc(len);
503 ret->display_recp = malloc(len);
504 ret->recp_orgroom = malloc(len);
505 org_recp = malloc(len);
507 ret->errormsg[0] = 0;
508 ret->recp_local[0] = 0;
509 ret->recp_internet[0] = 0;
510 ret->recp_room[0] = 0;
511 ret->recp_orgroom[0] = 0;
512 ret->display_recp[0] = 0;
514 ret->recptypes_magic = RECPTYPES_MAGIC;
516 /* Change all valid separator characters to commas */
517 for (i=0; !IsEmptyStr(&recipients[i]); ++i) {
518 if ((recipients[i] == ';') || (recipients[i] == '|')) {
523 /* Now start extracting recipients... */
525 while (!IsEmptyStr(recipients)) {
526 for (i=0; i<=strlen(recipients); ++i) {
527 if (recipients[i] == '\"') in_quotes = 1 - in_quotes;
528 if ( ( (recipients[i] == ',') && (!in_quotes) ) || (recipients[i] == 0) ) {
529 safestrncpy(this_recp, recipients, i+1);
531 if (recipients[i] == ',') {
532 strcpy(recipients, &recipients[i+1]);
535 strcpy(recipients, "");
542 if (IsEmptyStr(this_recp))
544 syslog(LOG_DEBUG, "internet_addressing: evaluating recipient #%d: %s", num_recps, this_recp);
547 strcpy(org_recp, this_recp);
550 mailtype = alias(this_recp);
552 for (j = 0; !IsEmptyStr(&this_recp[j]); ++j) {
553 if (this_recp[j]=='_') {
554 this_recp_cooked[j] = ' ';
557 this_recp_cooked[j] = this_recp[j];
560 this_recp_cooked[j] = '\0';
565 if (!strcasecmp(this_recp, "sysop")) {
567 strcpy(this_recp, CtdlGetConfigStr("c_aideroom"));
568 if (!IsEmptyStr(ret->recp_room)) {
569 strcat(ret->recp_room, "|");
571 strcat(ret->recp_room, this_recp);
573 else if ( (!strncasecmp(this_recp, "room_", 5))
574 && (!CtdlGetRoom(&tempQR, &this_recp_cooked[5])) ) {
576 /* Save room so we can restore it later */
580 /* Check permissions to send mail to this room */
581 err = CtdlDoIHavePermissionToPostInThisRoom(
586 0 /* 0 = not a reply */
594 if (!IsEmptyStr(ret->recp_room)) {
595 strcat(ret->recp_room, "|");
597 strcat(ret->recp_room, &this_recp_cooked[5]);
599 if (!IsEmptyStr(ret->recp_orgroom)) {
600 strcat(ret->recp_orgroom, "|");
602 strcat(ret->recp_orgroom, org_recp);
606 /* Restore room in case something needs it */
610 else if (CtdlGetUser(&tempUS, this_recp) == 0) {
612 strcpy(this_recp, tempUS.fullname);
613 if (!IsEmptyStr(ret->recp_local)) {
614 strcat(ret->recp_local, "|");
616 strcat(ret->recp_local, this_recp);
618 else if (CtdlGetUser(&tempUS, this_recp_cooked) == 0) {
620 strcpy(this_recp, tempUS.fullname);
621 if (!IsEmptyStr(ret->recp_local)) {
622 strcat(ret->recp_local, "|");
624 strcat(ret->recp_local, this_recp);
632 /* Yes, you're reading this correctly: if the target
633 * domain points back to the local system,
634 * the address is invalid. That's
635 * because if the address were valid, we would have
636 * already translated it to a local address by now.
638 if (IsDirectory(this_recp, 0)) {
644 if (!IsEmptyStr(ret->recp_internet)) {
645 strcat(ret->recp_internet, "|");
647 strcat(ret->recp_internet, this_recp);
656 if (IsEmptyStr(errmsg)) {
657 snprintf(append, sizeof append, "Invalid recipient: %s", this_recp);
660 snprintf(append, sizeof append, "%s", errmsg);
662 if ( (strlen(ret->errormsg) + strlen(append) + 3) < SIZ) {
663 if (!IsEmptyStr(ret->errormsg)) {
664 strcat(ret->errormsg, "; ");
666 strcat(ret->errormsg, append);
670 if (IsEmptyStr(ret->display_recp)) {
671 strcpy(append, this_recp);
674 snprintf(append, sizeof append, ", %s", this_recp);
676 if ( (strlen(ret->display_recp)+strlen(append)) < SIZ) {
677 strcat(ret->display_recp, append);
683 if ( (ret->num_local + ret->num_internet + ret->num_room + ret->num_error) == 0) {
684 ret->num_error = (-1);
685 strcpy(ret->errormsg, "No recipients specified.");
688 syslog(LOG_DEBUG, "internet_addressing: validate_recipients() = %d local, %d room, %d SMTP, %d error",
689 ret->num_local, ret->num_room, ret->num_internet, ret->num_error
698 * Destructor for recptypes
700 void free_recipients(struct recptypes *valid) {
706 if (valid->recptypes_magic != RECPTYPES_MAGIC) {
707 syslog(LOG_ERR, "internet_addressing: attempt to call free_recipients() on some other data type!");
711 if (valid->errormsg != NULL) free(valid->errormsg);
712 if (valid->recp_local != NULL) free(valid->recp_local);
713 if (valid->recp_internet != NULL) free(valid->recp_internet);
714 if (valid->recp_room != NULL) free(valid->recp_room);
715 if (valid->recp_orgroom != NULL) free(valid->recp_orgroom);
716 if (valid->display_recp != NULL) free(valid->display_recp);
717 if (valid->bounce_to != NULL) free(valid->bounce_to);
718 if (valid->envelope_from != NULL) free(valid->envelope_from);
719 if (valid->sending_room != NULL) free(valid->sending_room);
724 char *qp_encode_email_addrs(char *source) {
725 char *user, *node, *name;
726 const char headerStr[] = "=?UTF-8?Q?";
730 int need_to_encode = 0;
736 long nAddrPtrMax = 50;
741 if (source == NULL) return source;
742 if (IsEmptyStr(source)) return source;
743 syslog(LOG_DEBUG, "internet_addressing: qp_encode_email_addrs <%s>", source);
745 AddrPtr = malloc (sizeof (long) * nAddrPtrMax);
746 AddrUtf8 = malloc (sizeof (long) * nAddrPtrMax);
747 memset(AddrUtf8, 0, sizeof (long) * nAddrPtrMax);
750 while (!IsEmptyStr (&source[i])) {
751 if (nColons >= nAddrPtrMax){
754 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
755 memcpy (ptr, AddrPtr, sizeof (long) * nAddrPtrMax);
756 free (AddrPtr), AddrPtr = ptr;
758 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
759 memset(&ptr[nAddrPtrMax], 0, sizeof (long) * nAddrPtrMax);
761 memcpy (ptr, AddrUtf8, sizeof (long) * nAddrPtrMax);
762 free (AddrUtf8), AddrUtf8 = ptr;
765 if (((unsigned char) source[i] < 32) || ((unsigned char) source[i] > 126)) {
767 AddrUtf8[nColons] = 1;
769 if (source[i] == '"') {
770 InQuotes = !InQuotes;
772 if (!InQuotes && source[i] == ',') {
773 AddrPtr[nColons] = i;
778 if (need_to_encode == 0) {
785 EncodedMaxLen = nColons * (sizeof(headerStr) + 3) + SourceLen * 3;
786 Encoded = (char*) malloc (EncodedMaxLen);
788 for (i = 0; i < nColons; i++) {
789 source[AddrPtr[i]++] = '\0';
791 /* TODO: if libidn, this might get larger*/
792 user = malloc(SourceLen + 1);
793 node = malloc(SourceLen + 1);
794 name = malloc(SourceLen + 1);
798 for (i = 0; i < nColons && nPtr != NULL; i++) {
799 nmax = EncodedMaxLen - (nPtr - Encoded);
801 process_rfc822_addr(&source[AddrPtr[i]], user, node, name);
802 /* TODO: libIDN here ! */
803 if (IsEmptyStr(name)) {
804 n = snprintf(nPtr, nmax, (i==0)?"%s@%s" : ",%s@%s", user, node);
807 EncodedName = rfc2047encode(name, strlen(name));
808 n = snprintf(nPtr, nmax, (i==0)?"%s <%s@%s>" : ",%s <%s@%s>", EncodedName, user, node);
813 n = snprintf(nPtr, nmax, (i==0)?"%s" : ",%s", &source[AddrPtr[i]]);
819 ptr = (char*) malloc(EncodedMaxLen * 2);
820 memcpy(ptr, Encoded, EncodedMaxLen);
821 nnPtr = ptr + (nPtr - Encoded), nPtr = nnPtr;
822 free(Encoded), Encoded = ptr;
824 i--; /* do it once more with properly lengthened buffer */
827 for (i = 0; i < nColons; i++)
828 source[--AddrPtr[i]] = ',';
840 * Unfold a multi-line field into a single line, removing multi-whitespaces
842 void unfold_rfc822_field(char **field, char **FieldEnd)
845 char *pField = *field;
847 char *pFieldEnd = *FieldEnd;
849 while (isspace(*pField))
851 /* remove leading/trailing whitespace */
854 while (isspace(*pFieldEnd))
857 *FieldEnd = pFieldEnd;
858 /* convert non-space whitespace to spaces, and remove double blanks */
859 for (sField = *field = pField;
863 if ((*sField=='\r') || (*sField=='\n'))
866 while ( ( (*(sField + offset) == '\r') || (*(sField + offset) == '\n' )) && (sField + offset < pFieldEnd) ) {
873 if (*sField=='\"') quote = 1 - quote;
875 if (isspace(*sField)) {
880 while ((sField < pFieldEnd) &&
885 else *pField = *sField;
887 else *pField = *sField;
891 *FieldEnd = pField - 1;
896 * Split an RFC822-style address into userid, host, and full name
899 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name) {
903 strcpy(node, CtdlGetConfigStr("c_fqdn"));
906 if (rfc822 == NULL) return;
908 /* extract full name - first, it's From minus <userid> */
909 strcpy(name, rfc822);
910 stripout(name, '<', '>');
912 /* strip anything to the left of a bang */
913 while ((!IsEmptyStr(name)) && (haschar(name, '!') > 0))
914 strcpy(name, &name[1]);
916 /* and anything to the right of a @ or % */
917 for (a = 0; name[a] != '\0'; ++a) {
918 if (name[a] == '@') {
922 if (name[a] == '%') {
928 /* but if there are parentheses, that changes the rules... */
929 if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
930 strcpy(name, rfc822);
931 stripallbut(name, '(', ')');
934 /* but if there are a set of quotes, that supersedes everything */
935 if (haschar(rfc822, 34) == 2) {
936 strcpy(name, rfc822);
937 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
938 strcpy(&name[0], &name[1]);
940 strcpy(&name[0], &name[1]);
941 for (a = 0; name[a] != '\0'; ++a)
947 /* extract user id */
948 strcpy(user, rfc822);
950 /* first get rid of anything in parens */
951 stripout(user, '(', ')');
953 /* if there's a set of angle brackets, strip it down to that */
954 if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
955 stripallbut(user, '<', '>');
958 /* strip anything to the left of a bang */
959 while ((!IsEmptyStr(user)) && (haschar(user, '!') > 0))
960 strcpy(user, &user[1]);
962 /* and anything to the right of a @ or % */
963 for (a = 0; user[a] != '\0'; ++a) {
964 if (user[a] == '@') {
968 if (user[a] == '%') {
975 /* extract node name */
976 strcpy(node, rfc822);
978 /* first get rid of anything in parens */
979 stripout(node, '(', ')');
981 /* if there's a set of angle brackets, strip it down to that */
982 if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
983 stripallbut(node, '<', '>');
986 /* If no node specified, tack ours on instead */
988 (haschar(node, '@')==0)
989 && (haschar(node, '%')==0)
990 && (haschar(node, '!')==0)
992 strcpy(node, CtdlGetConfigStr("c_nodename"));
996 /* strip anything to the left of a @ */
997 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0))
998 strcpy(node, &node[1]);
1000 /* strip anything to the left of a % */
1001 while ((!IsEmptyStr(node)) && (haschar(node, '%') > 0))
1002 strcpy(node, &node[1]);
1004 /* reduce multiple system bang paths to node!user */
1005 while ((!IsEmptyStr(node)) && (haschar(node, '!') > 1))
1006 strcpy(node, &node[1]);
1008 /* now get rid of the user portion of a node!user string */
1009 for (a = 0; node[a] != '\0'; ++a)
1010 if (node[a] == '!') {
1016 /* strip leading and trailing spaces in all strings */
1021 /* If we processed a string that had the address in angle brackets
1022 * but no name outside the brackets, we now have an empty name. In
1023 * this case, use the user portion of the address as the name.
1025 if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
1032 * convert_field() is a helper function for convert_internet_message().
1033 * Given start/end positions for an rfc822 field, it converts it to a Citadel
1034 * field if it wants to, and unfolds it if necessary.
1036 * Returns 1 if the field was converted and inserted into the Citadel message
1037 * structure, implying that the source field should be removed from the
1040 int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
1041 char *key, *value, *valueend;
1045 const char *colonpos = NULL;
1054 for (pos = end; pos >= beg; pos--) {
1055 if (*pos == ':') colonpos = pos;
1058 if (colonpos == NULL) return(0); /* no colon? not a valid header line */
1061 key = malloc(len + 2);
1062 memcpy(key, beg, len + 1);
1064 valueend = key + len;
1065 * ( key + (colonpos - beg) ) = '\0';
1066 value = &key[(colonpos - beg) + 1];
1067 /* printf("Header: [%s]\nValue: [%s]\n", key, value); */
1068 unfold_rfc822_field(&value, &valueend);
1069 valuelen = valueend - value + 1;
1070 /* printf("UnfoldedValue: [%s]\n", value); */
1073 * Here's the big rfc822-to-citadel loop.
1076 /* Date/time is converted into a unix timestamp. If the conversion
1077 * fails, we replace it with the time the message arrived locally.
1079 if (!strcasecmp(key, "Date")) {
1080 parsed_date = parsedate(value);
1081 if (parsed_date < 0L) parsed_date = time(NULL);
1083 if (CM_IsEmpty(msg, eTimestamp))
1084 CM_SetFieldLONG(msg, eTimestamp, parsed_date);
1088 else if (!strcasecmp(key, "From")) {
1089 process_rfc822_addr(value, user, node, name);
1090 syslog(LOG_DEBUG, "internet_addressing: converted to <%s@%s> (%s)", user, node, name);
1091 snprintf(addr, sizeof(addr), "%s@%s", user, node);
1092 if (CM_IsEmpty(msg, eAuthor) && !IsEmptyStr(name)) {
1093 CM_SetField(msg, eAuthor, name, -1);
1095 if (CM_IsEmpty(msg, erFc822Addr) && !IsEmptyStr(addr)) {
1096 CM_SetField(msg, erFc822Addr, addr, -1);
1101 else if (!strcasecmp(key, "Subject")) {
1102 if (CM_IsEmpty(msg, eMsgSubject))
1103 CM_SetField(msg, eMsgSubject, value, valuelen);
1107 else if (!strcasecmp(key, "List-ID")) {
1108 if (CM_IsEmpty(msg, eListID))
1109 CM_SetField(msg, eListID, value, valuelen);
1113 else if (!strcasecmp(key, "To")) {
1114 if (CM_IsEmpty(msg, eRecipient))
1115 CM_SetField(msg, eRecipient, value, valuelen);
1119 else if (!strcasecmp(key, "CC")) {
1120 if (CM_IsEmpty(msg, eCarbonCopY))
1121 CM_SetField(msg, eCarbonCopY, value, valuelen);
1125 else if (!strcasecmp(key, "Message-ID")) {
1126 if (!CM_IsEmpty(msg, emessageId)) {
1127 syslog(LOG_WARNING, "internet_addressing: duplicate message id");
1134 pValueLen = valuelen;
1135 /* Strip angle brackets */
1136 while (haschar(pValue, '<') > 0) {
1141 for (i = 0; i <= pValueLen; ++i)
1142 if (pValue[i] == '>') {
1147 CM_SetField(msg, emessageId, pValue, pValueLen);
1153 else if (!strcasecmp(key, "Return-Path")) {
1154 if (CM_IsEmpty(msg, eMessagePath))
1155 CM_SetField(msg, eMessagePath, value, valuelen);
1159 else if (!strcasecmp(key, "Envelope-To")) {
1160 if (CM_IsEmpty(msg, eenVelopeTo))
1161 CM_SetField(msg, eenVelopeTo, value, valuelen);
1165 else if (!strcasecmp(key, "References")) {
1166 CM_SetField(msg, eWeferences, value, valuelen);
1170 else if (!strcasecmp(key, "Reply-To")) {
1171 CM_SetField(msg, eReplyTo, value, valuelen);
1175 else if (!strcasecmp(key, "In-reply-to")) {
1176 if (CM_IsEmpty(msg, eWeferences)) /* References: supersedes In-reply-to: */
1177 CM_SetField(msg, eWeferences, value, valuelen);
1183 /* Clean up and move on. */
1184 free(key); /* Don't free 'value', it's actually the same buffer */
1190 * Convert RFC822 references format (References) to Citadel references format (Weferences)
1192 void convert_references_to_wefewences(char *str) {
1193 int bracket_nesting = 0;
1195 char *moveptr = NULL;
1202 if (bracket_nesting < 0) bracket_nesting = 0;
1204 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
1208 else if (bracket_nesting > 0) {
1214 *moveptr = *(moveptr+1);
1218 if (ch == '<') ++bracket_nesting;
1225 * Convert an RFC822 message (headers + body) to a CtdlMessage structure.
1226 * NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
1227 * will be deallocated when CM_Free() is called. Therefore, the
1228 * supplied buffer should be DEREFERENCED. It should not be freed or used
1231 struct CtdlMessage *convert_internet_message(char *rfc822) {
1232 StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
1234 return convert_internet_message_buf(&RFCBuf);
1238 struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822)
1240 struct CtdlMessage *msg;
1241 const char *pos, *beg, *end, *totalend;
1242 int done, alldone = 0;
1244 StrBuf *OtherHeaders;
1246 msg = malloc(sizeof(struct CtdlMessage));
1247 if (msg == NULL) return msg;
1249 memset(msg, 0, sizeof(struct CtdlMessage));
1250 msg->cm_magic = CTDLMESSAGE_MAGIC; /* self check */
1251 msg->cm_anon_type = 0; /* never anonymous */
1252 msg->cm_format_type = FMT_RFC822; /* internet message */
1254 pos = ChrPtr(*rfc822);
1255 totalend = pos + StrLength(*rfc822);
1257 OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
1261 /* Locate beginning and end of field, keeping in mind that
1262 * some fields might be multiline
1266 while ((end < totalend) &&
1271 if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) )
1276 /* done with headers? */
1278 ( (*(pos+1)=='\n') ||
1284 if (pos >= (totalend - 1) )
1294 /* At this point we have a field. Are we interested in it? */
1295 converted = convert_field(msg, beg, end);
1297 /* Strip the field out of the RFC822 header if we used it */
1299 StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
1300 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1303 /* If we've hit the end of the message, bail out */
1304 if (pos >= totalend)
1307 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1309 StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
1311 CM_SetAsFieldSB(msg, eMesageText, &OtherHeaders);
1313 /* Follow-up sanity checks... */
1315 /* If there's no timestamp on this message, set it to now. */
1316 if (CM_IsEmpty(msg, eTimestamp)) {
1317 CM_SetFieldLONG(msg, eTimestamp, time(NULL));
1320 /* If a W (references, or rather, Wefewences) field is present, we
1321 * have to convert it from RFC822 format to Citadel format.
1323 if (!CM_IsEmpty(msg, eWeferences)) {
1325 convert_references_to_wefewences(msg->cm_fields[eWeferences]);
1333 * Look for a particular header field in an RFC822 message text. If the
1334 * requested field is found, it is unfolded (if necessary) and returned to
1335 * the caller. The field name is stripped out, leaving only its contents.
1336 * The caller is responsible for freeing the returned buffer. If the requested
1337 * field is not present, or anything else goes wrong, it returns NULL.
1339 char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
1340 char *fieldbuf = NULL;
1341 const char *end_of_headers;
1342 const char *field_start;
1347 /* Should never happen, but sometimes we get stupid */
1348 if (rfc822 == NULL) return(NULL);
1349 if (fieldname == NULL) return(NULL);
1351 snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
1353 /* Locate the end of the headers, so we don't run past that point */
1354 end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
1355 if (end_of_headers == NULL) {
1356 end_of_headers = cbmstrcasestr(rfc822, "\n\n");
1358 if (end_of_headers == NULL) return (NULL);
1360 field_start = cbmstrcasestr(rfc822, fieldhdr);
1361 if (field_start == NULL) return(NULL);
1362 if (field_start > end_of_headers) return(NULL);
1364 fieldbuf = malloc(SIZ);
1365 strcpy(fieldbuf, "");
1368 ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
1369 while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
1370 strcat(fieldbuf, " ");
1371 cont = &fieldbuf[strlen(fieldbuf)];
1372 ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
1376 strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
1383 /*****************************************************************************
1384 * DIRECTORY MANAGEMENT FUNCTIONS *
1385 *****************************************************************************/
1388 * Generate the index key for an Internet e-mail address to be looked up
1391 void directory_key(char *key, char *addr) {
1395 for (i=0; !IsEmptyStr(&addr[i]); ++i) {
1396 if (!isspace(addr[i])) {
1397 key[keylen++] = tolower(addr[i]);
1402 syslog(LOG_DEBUG, "internet_addressing: directory key is <%s>", key);
1407 * Return nonzero if the supplied address is in one of "our" domains
1409 int IsDirectory(char *addr, int allow_masq_domains) {
1413 extract_token(domain, addr, 1, '@', sizeof domain);
1416 h = CtdlHostAlias(domain);
1418 if ( (h == hostalias_masq) && allow_masq_domains)
1421 if (h == hostalias_localhost) {
1431 * Add an Internet e-mail address to the directory for a user
1433 int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
1436 if (IsDirectory(internet_addr, 0) == 0) {
1439 syslog(LOG_DEBUG, "internet_addressing: create directory entry: %s --> %s", internet_addr, citadel_addr);
1440 directory_key(key, internet_addr);
1441 cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
1447 * Delete an Internet e-mail address from the directory.
1449 * (NOTE: we don't actually use or need the citadel_addr variable; it's merely
1450 * here because the callback API expects to be able to send it.)
1452 int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
1455 syslog(LOG_DEBUG, "internet_addressing: delete directory entry: %s --> %s", internet_addr, citadel_addr);
1456 directory_key(key, internet_addr);
1457 return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
1462 * Look up an Internet e-mail address in the directory.
1463 * On success: returns 0, and Citadel address stored in 'target'
1464 * On failure: returns nonzero
1466 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
1467 struct cdbdata *cdbrec;
1470 /* Dump it in there unchanged, just for kicks */
1471 if (target != NULL) {
1472 safestrncpy(target, internet_addr, targbuflen);
1475 /* Only do lookups for addresses with hostnames in them */
1476 if (num_tokens(internet_addr, '@') != 2) return(-1);
1478 /* Only do lookups for domains in the directory */
1479 if (IsDirectory(internet_addr, 0) == 0) return(-1);
1481 directory_key(key, internet_addr);
1482 cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key) );
1483 if (cdbrec != NULL) {
1484 if (target != NULL) {
1485 safestrncpy(target, cdbrec->ptr, targbuflen);
1496 * Harvest any email addresses that someone might want to have in their
1497 * "collected addresses" book.
1499 char *harvest_collected_addresses(struct CtdlMessage *msg) {
1502 char user[256], node[256], name[256];
1505 eMsgField field = 0;
1507 if (msg == NULL) return(NULL);
1511 if (!CM_IsEmpty(msg, eAuthor)) {
1512 strcat(addr, msg->cm_fields[eAuthor]);
1514 if (!CM_IsEmpty(msg, erFc822Addr)) {
1516 strcat(addr, msg->cm_fields[erFc822Addr]);
1518 if (IsDirectory(msg->cm_fields[erFc822Addr], 0)) {
1523 if (is_harvestable) {
1524 coll = strdup(addr);
1530 if (coll == NULL) return(NULL);
1532 /* Scan both the R (To) and Y (CC) fields */
1533 for (i = 0; i < 2; ++i) {
1534 if (i == 0) field = eRecipient;
1535 if (i == 1) field = eCarbonCopY;
1537 if (!CM_IsEmpty(msg, field)) {
1538 for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
1539 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
1540 if (strstr(addr, "=?") != NULL)
1541 utf8ify_rfc822_string(addr);
1542 process_rfc822_addr(addr, user, node, name);
1543 h = CtdlHostAlias(node);
1544 if (h != hostalias_localhost) {
1545 coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1546 if (coll == NULL) return(NULL);
1547 if (!IsEmptyStr(coll)) {
1557 if (IsEmptyStr(coll)) {
1566 * Helper function for CtdlRebuildDirectoryIndex()
1568 void CtdlRebuildDirectoryIndex_backend(char *username, void *data) {
1571 struct ctdluser usbuf;
1573 if (CtdlGetUser(&usbuf, username) != 0) {
1577 if ( (!IsEmptyStr(usbuf.fullname)) && (!IsEmptyStr(usbuf.emailaddrs)) ) {
1578 for (j=0; j<num_tokens(usbuf.emailaddrs, '|'); ++j) {
1579 char one_email[512];
1580 extract_token(one_email, usbuf.emailaddrs, j, '|', sizeof one_email);
1581 CtdlDirectoryAddUser(one_email, usbuf.fullname);
1588 * Initialize the directory database (erasing anything already there)
1590 void CtdlRebuildDirectoryIndex(void) {
1591 syslog(LOG_INFO, "internet_addressing: rebuilding email address directory index");
1592 cdb_trunc(CDB_DIRECTORY);
1593 ForEachUser(CtdlRebuildDirectoryIndex_backend, NULL);
1598 * Configure Internet email addresses for a user account, updating the Directory Index in the process
1600 void CtdlSetEmailAddressesForUser(char *requested_user, char *new_emailaddrs)
1602 struct ctdluser usbuf;
1606 if (CtdlGetUserLock(&usbuf, requested_user) != 0) { // We are relying on the fact that the DirectoryIndex functions don't lock.
1607 return; // Silently fail here if we can't acquire a lock on the user record.
1610 syslog(LOG_DEBUG, "internet_addressing: setting email addresses for <%s> to <%s>", usbuf.fullname, new_emailaddrs);
1612 /* Delete all of the existing directory index records for the user (easier this way) */
1613 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1614 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1615 CtdlDirectoryDelUser(buf, requested_user);
1618 strcpy(usbuf.emailaddrs, new_emailaddrs); // make it official.
1620 /* Index all of the new email addresses (they've already been sanitized) */
1621 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1622 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1623 CtdlDirectoryAddUser(buf, requested_user);
1626 CtdlPutUserLock(&usbuf);
1631 * Auto-generate an Internet email address for a user account
1633 void AutoGenerateEmailAddressForUser(struct ctdluser *user)
1635 char synthetic_email_addr[1024];
1639 for (i=0; u==0; ++i) {
1641 // first try just converting the user name to lowercase and replacing spaces with underscores
1642 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "%s@%s", user->fullname, CtdlGetConfigStr("c_fqdn"));
1643 for (j=0; ((synthetic_email_addr[j] != '\0')&&(synthetic_email_addr[j] != '@')); j++) {
1644 synthetic_email_addr[j] = tolower(synthetic_email_addr[j]);
1645 if (!isalnum(synthetic_email_addr[j])) {
1646 synthetic_email_addr[j] = '_';
1651 // then try 'ctdl' followed by the user number
1652 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08lx@%s", user->usernum, CtdlGetConfigStr("c_fqdn"));
1655 // oof. just keep trying other numbers until we find one
1656 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08x@%s", i, CtdlGetConfigStr("c_fqdn"));
1658 u = CtdlDirectoryLookup(NULL, synthetic_email_addr, 0);
1659 syslog(LOG_DEBUG, "user_ops: address <%s> lookup returned <%d>", synthetic_email_addr, u);
1662 CtdlSetEmailAddressesForUser(user->fullname, synthetic_email_addr);
1663 strncpy(CC->user.emailaddrs, synthetic_email_addr, sizeof(user->emailaddrs));
1664 syslog(LOG_DEBUG, "user_ops: auto-generated email address <%s> for <%s>", synthetic_email_addr, user->fullname);