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) {
381 for (ptr=name; *ptr; ++ptr) {
382 while ( (isspace(*ptr)) && (*(ptr+1)=='@') ) {
384 if (ptr > name) --ptr;
386 while ( (*ptr=='@') && (*(ptr+1)!=0) && (isspace(*(ptr+1))) ) {
387 strcpy(ptr+1, ptr+2);
394 * Aliasing for network mail.
396 int alias(char *name) { /* process alias and routing info for mail */
402 char original_name[256];
403 safestrncpy(original_name, name, sizeof original_name);
406 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
407 stripallbut(name, '<', '>');
409 /* Hit the email address directory */
410 if (CtdlDirectoryLookup(aaa, name, sizeof aaa) == 0) {
414 if (strcasecmp(original_name, name)) {
415 syslog(LOG_INFO, "internet_addressing: %s is being forwarded to %s", original_name, name);
418 /* Change "user @ xxx" to "user" if xxx is an alias for this host */
419 for (a=0; name[a] != '\0'; ++a) {
420 if (name[a] == '@') {
421 if (CtdlHostAlias(&name[a+1]) == hostalias_localhost) {
423 syslog(LOG_DEBUG, "internet_addressing: changed to <%s>", name);
429 /* determine local or remote type, see citadel.h */
430 at = haschar(name, '@');
431 if (at == 0) return(MES_LOCAL); /* no @'s - local address */
432 if (at > 1) return(MES_ERROR); /* >1 @'s - invalid address */
433 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
435 /* figure out the delivery mode */
436 extract_token(node, name, 1, '@', sizeof node);
438 /* If there are one or more dots in the nodename, we assume that it
439 * is an FQDN and will attempt SMTP delivery to the Internet.
441 if (haschar(node, '.') > 0) {
442 return(MES_INTERNET);
445 /* If we get to this point it's an invalid node name */
451 * Validate recipients, count delivery types and errors, and handle aliasing
452 * FIXME check for dupes!!!!!
454 * Returns 0 if all addresses are ok, ret->num_error = -1 if no addresses
455 * were specified, or the number of addresses found invalid.
457 * Caller needs to free the result using free_recipients()
459 struct recptypes *validate_recipients(const char *supplied_recipients, const char *RemoteIdentifier, int Flags) {
460 struct CitContext *CCC = CC;
461 struct recptypes *ret;
462 char *recipients = NULL;
465 char this_recp_cooked[256];
472 struct ctdluser tempUS;
473 struct ctdlroom tempQR;
474 struct ctdlroom tempQR2;
480 ret = (struct recptypes *) malloc(sizeof(struct recptypes));
481 if (ret == NULL) return(NULL);
483 /* Set all strings to null and numeric values to zero */
484 memset(ret, 0, sizeof(struct recptypes));
486 if (supplied_recipients == NULL) {
487 recipients = strdup("");
490 recipients = strdup(supplied_recipients);
493 /* Allocate some memory. Yes, this allocates 500% more memory than we will
494 * actually need, but it's healthier for the heap than doing lots of tiny
495 * realloc() calls instead.
497 len = strlen(recipients) + 1024;
498 ret->errormsg = malloc(len);
499 ret->recp_local = malloc(len);
500 ret->recp_internet = malloc(len);
501 ret->recp_room = malloc(len);
502 ret->display_recp = malloc(len);
503 ret->recp_orgroom = malloc(len);
504 org_recp = malloc(len);
506 ret->errormsg[0] = 0;
507 ret->recp_local[0] = 0;
508 ret->recp_internet[0] = 0;
509 ret->recp_room[0] = 0;
510 ret->recp_orgroom[0] = 0;
511 ret->display_recp[0] = 0;
513 ret->recptypes_magic = RECPTYPES_MAGIC;
515 /* Change all valid separator characters to commas */
516 for (i=0; !IsEmptyStr(&recipients[i]); ++i) {
517 if ((recipients[i] == ';') || (recipients[i] == '|')) {
522 /* Now start extracting recipients... */
524 while (!IsEmptyStr(recipients)) {
525 for (i=0; i<=strlen(recipients); ++i) {
526 if (recipients[i] == '\"') in_quotes = 1 - in_quotes;
527 if ( ( (recipients[i] == ',') && (!in_quotes) ) || (recipients[i] == 0) ) {
528 safestrncpy(this_recp, recipients, i+1);
530 if (recipients[i] == ',') {
531 strcpy(recipients, &recipients[i+1]);
534 strcpy(recipients, "");
541 if (IsEmptyStr(this_recp))
543 syslog(LOG_DEBUG, "internet_addressing: evaluating recipient #%d: %s", num_recps, this_recp);
546 strcpy(org_recp, this_recp);
549 mailtype = alias(this_recp);
551 for (j = 0; !IsEmptyStr(&this_recp[j]); ++j) {
552 if (this_recp[j]=='_') {
553 this_recp_cooked[j] = ' ';
556 this_recp_cooked[j] = this_recp[j];
559 this_recp_cooked[j] = '\0';
564 if (!strcasecmp(this_recp, "sysop")) {
566 strcpy(this_recp, CtdlGetConfigStr("c_aideroom"));
567 if (!IsEmptyStr(ret->recp_room)) {
568 strcat(ret->recp_room, "|");
570 strcat(ret->recp_room, this_recp);
572 else if ( (!strncasecmp(this_recp, "room_", 5)) && (!CtdlGetRoom(&tempQR, &this_recp_cooked[5])) ) {
574 /* Save room so we can restore it later */
578 /* Check permissions to send mail to this room */
579 err = CtdlDoIHavePermissionToPostInThisRoom(
584 0 /* 0 = not a reply */
592 if (!IsEmptyStr(ret->recp_room)) {
593 strcat(ret->recp_room, "|");
595 strcat(ret->recp_room, &this_recp_cooked[5]);
597 if (!IsEmptyStr(ret->recp_orgroom)) {
598 strcat(ret->recp_orgroom, "|");
600 strcat(ret->recp_orgroom, org_recp);
604 /* Restore room in case something needs it */
608 else if (CtdlGetUser(&tempUS, this_recp) == 0) {
610 strcpy(this_recp, tempUS.fullname);
611 if (!IsEmptyStr(ret->recp_local)) {
612 strcat(ret->recp_local, "|");
614 strcat(ret->recp_local, this_recp);
616 else if (CtdlGetUser(&tempUS, this_recp_cooked) == 0) {
618 strcpy(this_recp, tempUS.fullname);
619 if (!IsEmptyStr(ret->recp_local)) {
620 strcat(ret->recp_local, "|");
622 strcat(ret->recp_local, this_recp);
630 /* Yes, you're reading this correctly: if the target
631 * domain points back to the local system,
632 * the address is invalid. That's
633 * because if the address were valid, we would have
634 * already translated it to a local address by now.
636 if (IsDirectory(this_recp, 0)) {
642 if (!IsEmptyStr(ret->recp_internet)) {
643 strcat(ret->recp_internet, "|");
645 strcat(ret->recp_internet, this_recp);
654 if (IsEmptyStr(errmsg)) {
655 snprintf(append, sizeof append, "Invalid recipient: %s", this_recp);
658 snprintf(append, sizeof append, "%s", errmsg);
660 if ( (strlen(ret->errormsg) + strlen(append) + 3) < SIZ) {
661 if (!IsEmptyStr(ret->errormsg)) {
662 strcat(ret->errormsg, "; ");
664 strcat(ret->errormsg, append);
668 if (IsEmptyStr(ret->display_recp)) {
669 strcpy(append, this_recp);
672 snprintf(append, sizeof append, ", %s", this_recp);
674 if ( (strlen(ret->display_recp)+strlen(append)) < SIZ) {
675 strcat(ret->display_recp, append);
681 if ( (ret->num_local + ret->num_internet + ret->num_room + ret->num_error) == 0) {
682 ret->num_error = (-1);
683 strcpy(ret->errormsg, "No recipients specified.");
686 syslog(LOG_DEBUG, "internet_addressing: validate_recipients() = %d local, %d room, %d SMTP, %d error",
687 ret->num_local, ret->num_room, ret->num_internet, ret->num_error
696 * Destructor for recptypes
698 void free_recipients(struct recptypes *valid) {
704 if (valid->recptypes_magic != RECPTYPES_MAGIC) {
705 syslog(LOG_ERR, "internet_addressing: attempt to call free_recipients() on some other data type!");
709 if (valid->errormsg != NULL) free(valid->errormsg);
710 if (valid->recp_local != NULL) free(valid->recp_local);
711 if (valid->recp_internet != NULL) free(valid->recp_internet);
712 if (valid->recp_room != NULL) free(valid->recp_room);
713 if (valid->recp_orgroom != NULL) free(valid->recp_orgroom);
714 if (valid->display_recp != NULL) free(valid->display_recp);
715 if (valid->bounce_to != NULL) free(valid->bounce_to);
716 if (valid->envelope_from != NULL) free(valid->envelope_from);
717 if (valid->sending_room != NULL) free(valid->sending_room);
722 char *qp_encode_email_addrs(char *source) {
723 char *user, *node, *name;
724 const char headerStr[] = "=?UTF-8?Q?";
728 int need_to_encode = 0;
734 long nAddrPtrMax = 50;
739 if (source == NULL) return source;
740 if (IsEmptyStr(source)) return source;
741 syslog(LOG_DEBUG, "internet_addressing: qp_encode_email_addrs <%s>", source);
743 AddrPtr = malloc (sizeof (long) * nAddrPtrMax);
744 AddrUtf8 = malloc (sizeof (long) * nAddrPtrMax);
745 memset(AddrUtf8, 0, sizeof (long) * nAddrPtrMax);
748 while (!IsEmptyStr (&source[i])) {
749 if (nColons >= nAddrPtrMax){
752 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
753 memcpy (ptr, AddrPtr, sizeof (long) * nAddrPtrMax);
754 free (AddrPtr), AddrPtr = ptr;
756 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
757 memset(&ptr[nAddrPtrMax], 0, sizeof (long) * nAddrPtrMax);
759 memcpy (ptr, AddrUtf8, sizeof (long) * nAddrPtrMax);
760 free (AddrUtf8), AddrUtf8 = ptr;
763 if (((unsigned char) source[i] < 32) || ((unsigned char) source[i] > 126)) {
765 AddrUtf8[nColons] = 1;
767 if (source[i] == '"') {
768 InQuotes = !InQuotes;
770 if (!InQuotes && source[i] == ',') {
771 AddrPtr[nColons] = i;
776 if (need_to_encode == 0) {
783 EncodedMaxLen = nColons * (sizeof(headerStr) + 3) + SourceLen * 3;
784 Encoded = (char*) malloc (EncodedMaxLen);
786 for (i = 0; i < nColons; i++) {
787 source[AddrPtr[i]++] = '\0';
789 /* TODO: if libidn, this might get larger*/
790 user = malloc(SourceLen + 1);
791 node = malloc(SourceLen + 1);
792 name = malloc(SourceLen + 1);
796 for (i = 0; i < nColons && nPtr != NULL; i++) {
797 nmax = EncodedMaxLen - (nPtr - Encoded);
799 process_rfc822_addr(&source[AddrPtr[i]], user, node, name);
800 /* TODO: libIDN here ! */
801 if (IsEmptyStr(name)) {
802 n = snprintf(nPtr, nmax, (i==0)?"%s@%s" : ",%s@%s", user, node);
805 EncodedName = rfc2047encode(name, strlen(name));
806 n = snprintf(nPtr, nmax, (i==0)?"%s <%s@%s>" : ",%s <%s@%s>", EncodedName, user, node);
811 n = snprintf(nPtr, nmax, (i==0)?"%s" : ",%s", &source[AddrPtr[i]]);
817 ptr = (char*) malloc(EncodedMaxLen * 2);
818 memcpy(ptr, Encoded, EncodedMaxLen);
819 nnPtr = ptr + (nPtr - Encoded), nPtr = nnPtr;
820 free(Encoded), Encoded = ptr;
822 i--; /* do it once more with properly lengthened buffer */
825 for (i = 0; i < nColons; i++)
826 source[--AddrPtr[i]] = ',';
838 * Unfold a multi-line field into a single line, removing multi-whitespaces
840 void unfold_rfc822_field(char **field, char **FieldEnd)
843 char *pField = *field;
845 char *pFieldEnd = *FieldEnd;
847 while (isspace(*pField))
849 /* remove leading/trailing whitespace */
852 while (isspace(*pFieldEnd))
855 *FieldEnd = pFieldEnd;
856 /* convert non-space whitespace to spaces, and remove double blanks */
857 for (sField = *field = pField;
861 if ((*sField=='\r') || (*sField=='\n'))
864 while ( ( (*(sField + offset) == '\r') || (*(sField + offset) == '\n' )) && (sField + offset < pFieldEnd) ) {
871 if (*sField=='\"') quote = 1 - quote;
873 if (isspace(*sField)) {
878 while ((sField < pFieldEnd) &&
883 else *pField = *sField;
885 else *pField = *sField;
889 *FieldEnd = pField - 1;
894 * Split an RFC822-style address into userid, host, and full name
897 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name) {
901 strcpy(node, CtdlGetConfigStr("c_fqdn"));
904 if (rfc822 == NULL) return;
906 /* extract full name - first, it's From minus <userid> */
907 strcpy(name, rfc822);
908 stripout(name, '<', '>');
910 /* strip anything to the left of a bang */
911 while ((!IsEmptyStr(name)) && (haschar(name, '!') > 0))
912 strcpy(name, &name[1]);
914 /* and anything to the right of a @ or % */
915 for (a = 0; name[a] != '\0'; ++a) {
916 if (name[a] == '@') {
920 if (name[a] == '%') {
926 /* but if there are parentheses, that changes the rules... */
927 if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
928 strcpy(name, rfc822);
929 stripallbut(name, '(', ')');
932 /* but if there are a set of quotes, that supersedes everything */
933 if (haschar(rfc822, 34) == 2) {
934 strcpy(name, rfc822);
935 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
936 strcpy(&name[0], &name[1]);
938 strcpy(&name[0], &name[1]);
939 for (a = 0; name[a] != '\0'; ++a)
945 /* extract user id */
946 strcpy(user, rfc822);
948 /* first get rid of anything in parens */
949 stripout(user, '(', ')');
951 /* if there's a set of angle brackets, strip it down to that */
952 if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
953 stripallbut(user, '<', '>');
956 /* strip anything to the left of a bang */
957 while ((!IsEmptyStr(user)) && (haschar(user, '!') > 0))
958 strcpy(user, &user[1]);
960 /* and anything to the right of a @ or % */
961 for (a = 0; user[a] != '\0'; ++a) {
962 if (user[a] == '@') {
966 if (user[a] == '%') {
973 /* extract node name */
974 strcpy(node, rfc822);
976 /* first get rid of anything in parens */
977 stripout(node, '(', ')');
979 /* if there's a set of angle brackets, strip it down to that */
980 if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
981 stripallbut(node, '<', '>');
984 /* If no node specified, tack ours on instead */
986 (haschar(node, '@')==0)
987 && (haschar(node, '%')==0)
988 && (haschar(node, '!')==0)
990 strcpy(node, CtdlGetConfigStr("c_nodename"));
994 /* strip anything to the left of a @ */
995 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0))
996 strcpy(node, &node[1]);
998 /* strip anything to the left of a % */
999 while ((!IsEmptyStr(node)) && (haschar(node, '%') > 0))
1000 strcpy(node, &node[1]);
1002 /* reduce multiple system bang paths to node!user */
1003 while ((!IsEmptyStr(node)) && (haschar(node, '!') > 1))
1004 strcpy(node, &node[1]);
1006 /* now get rid of the user portion of a node!user string */
1007 for (a = 0; node[a] != '\0'; ++a)
1008 if (node[a] == '!') {
1014 /* strip leading and trailing spaces in all strings */
1019 /* If we processed a string that had the address in angle brackets
1020 * but no name outside the brackets, we now have an empty name. In
1021 * this case, use the user portion of the address as the name.
1023 if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
1030 * convert_field() is a helper function for convert_internet_message().
1031 * Given start/end positions for an rfc822 field, it converts it to a Citadel
1032 * field if it wants to, and unfolds it if necessary.
1034 * Returns 1 if the field was converted and inserted into the Citadel message
1035 * structure, implying that the source field should be removed from the
1038 int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
1039 char *key, *value, *valueend;
1043 const char *colonpos = NULL;
1052 for (pos = end; pos >= beg; pos--) {
1053 if (*pos == ':') colonpos = pos;
1056 if (colonpos == NULL) return(0); /* no colon? not a valid header line */
1059 key = malloc(len + 2);
1060 memcpy(key, beg, len + 1);
1062 valueend = key + len;
1063 * ( key + (colonpos - beg) ) = '\0';
1064 value = &key[(colonpos - beg) + 1];
1065 /* printf("Header: [%s]\nValue: [%s]\n", key, value); */
1066 unfold_rfc822_field(&value, &valueend);
1067 valuelen = valueend - value + 1;
1068 /* printf("UnfoldedValue: [%s]\n", value); */
1071 * Here's the big rfc822-to-citadel loop.
1074 /* Date/time is converted into a unix timestamp. If the conversion
1075 * fails, we replace it with the time the message arrived locally.
1077 if (!strcasecmp(key, "Date")) {
1078 parsed_date = parsedate(value);
1079 if (parsed_date < 0L) parsed_date = time(NULL);
1081 if (CM_IsEmpty(msg, eTimestamp))
1082 CM_SetFieldLONG(msg, eTimestamp, parsed_date);
1086 else if (!strcasecmp(key, "From")) {
1087 process_rfc822_addr(value, user, node, name);
1088 syslog(LOG_DEBUG, "internet_addressing: converted to <%s@%s> (%s)", user, node, name);
1089 snprintf(addr, sizeof(addr), "%s@%s", user, node);
1090 if (CM_IsEmpty(msg, eAuthor) && !IsEmptyStr(name)) {
1091 CM_SetField(msg, eAuthor, name, -1);
1093 if (CM_IsEmpty(msg, erFc822Addr) && !IsEmptyStr(addr)) {
1094 CM_SetField(msg, erFc822Addr, addr, -1);
1099 else if (!strcasecmp(key, "Subject")) {
1100 if (CM_IsEmpty(msg, eMsgSubject))
1101 CM_SetField(msg, eMsgSubject, value, valuelen);
1105 else if (!strcasecmp(key, "List-ID")) {
1106 if (CM_IsEmpty(msg, eListID))
1107 CM_SetField(msg, eListID, value, valuelen);
1111 else if (!strcasecmp(key, "To")) {
1112 if (CM_IsEmpty(msg, eRecipient))
1113 CM_SetField(msg, eRecipient, value, valuelen);
1117 else if (!strcasecmp(key, "CC")) {
1118 if (CM_IsEmpty(msg, eCarbonCopY))
1119 CM_SetField(msg, eCarbonCopY, value, valuelen);
1123 else if (!strcasecmp(key, "Message-ID")) {
1124 if (!CM_IsEmpty(msg, emessageId)) {
1125 syslog(LOG_WARNING, "internet_addressing: duplicate message id");
1132 pValueLen = valuelen;
1133 /* Strip angle brackets */
1134 while (haschar(pValue, '<') > 0) {
1139 for (i = 0; i <= pValueLen; ++i)
1140 if (pValue[i] == '>') {
1145 CM_SetField(msg, emessageId, pValue, pValueLen);
1151 else if (!strcasecmp(key, "Return-Path")) {
1152 if (CM_IsEmpty(msg, eMessagePath))
1153 CM_SetField(msg, eMessagePath, value, valuelen);
1157 else if (!strcasecmp(key, "Envelope-To")) {
1158 if (CM_IsEmpty(msg, eenVelopeTo))
1159 CM_SetField(msg, eenVelopeTo, value, valuelen);
1163 else if (!strcasecmp(key, "References")) {
1164 CM_SetField(msg, eWeferences, value, valuelen);
1168 else if (!strcasecmp(key, "Reply-To")) {
1169 CM_SetField(msg, eReplyTo, value, valuelen);
1173 else if (!strcasecmp(key, "In-reply-to")) {
1174 if (CM_IsEmpty(msg, eWeferences)) /* References: supersedes In-reply-to: */
1175 CM_SetField(msg, eWeferences, value, valuelen);
1181 /* Clean up and move on. */
1182 free(key); /* Don't free 'value', it's actually the same buffer */
1188 * Convert RFC822 references format (References) to Citadel references format (Weferences)
1190 void convert_references_to_wefewences(char *str) {
1191 int bracket_nesting = 0;
1193 char *moveptr = NULL;
1200 if (bracket_nesting < 0) bracket_nesting = 0;
1202 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
1206 else if (bracket_nesting > 0) {
1212 *moveptr = *(moveptr+1);
1216 if (ch == '<') ++bracket_nesting;
1223 * Convert an RFC822 message (headers + body) to a CtdlMessage structure.
1224 * NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
1225 * will be deallocated when CM_Free() is called. Therefore, the
1226 * supplied buffer should be DEREFERENCED. It should not be freed or used
1229 struct CtdlMessage *convert_internet_message(char *rfc822) {
1230 StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
1232 return convert_internet_message_buf(&RFCBuf);
1236 struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822)
1238 struct CtdlMessage *msg;
1239 const char *pos, *beg, *end, *totalend;
1240 int done, alldone = 0;
1242 StrBuf *OtherHeaders;
1244 msg = malloc(sizeof(struct CtdlMessage));
1245 if (msg == NULL) return msg;
1247 memset(msg, 0, sizeof(struct CtdlMessage));
1248 msg->cm_magic = CTDLMESSAGE_MAGIC; /* self check */
1249 msg->cm_anon_type = 0; /* never anonymous */
1250 msg->cm_format_type = FMT_RFC822; /* internet message */
1252 pos = ChrPtr(*rfc822);
1253 totalend = pos + StrLength(*rfc822);
1255 OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
1259 /* Locate beginning and end of field, keeping in mind that
1260 * some fields might be multiline
1264 while ((end < totalend) &&
1269 if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) )
1274 /* done with headers? */
1276 ( (*(pos+1)=='\n') ||
1282 if (pos >= (totalend - 1) )
1292 /* At this point we have a field. Are we interested in it? */
1293 converted = convert_field(msg, beg, end);
1295 /* Strip the field out of the RFC822 header if we used it */
1297 StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
1298 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1301 /* If we've hit the end of the message, bail out */
1302 if (pos >= totalend)
1305 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1307 StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
1309 CM_SetAsFieldSB(msg, eMesageText, &OtherHeaders);
1311 /* Follow-up sanity checks... */
1313 /* If there's no timestamp on this message, set it to now. */
1314 if (CM_IsEmpty(msg, eTimestamp)) {
1315 CM_SetFieldLONG(msg, eTimestamp, time(NULL));
1318 /* If a W (references, or rather, Wefewences) field is present, we
1319 * have to convert it from RFC822 format to Citadel format.
1321 if (!CM_IsEmpty(msg, eWeferences)) {
1323 convert_references_to_wefewences(msg->cm_fields[eWeferences]);
1331 * Look for a particular header field in an RFC822 message text. If the
1332 * requested field is found, it is unfolded (if necessary) and returned to
1333 * the caller. The field name is stripped out, leaving only its contents.
1334 * The caller is responsible for freeing the returned buffer. If the requested
1335 * field is not present, or anything else goes wrong, it returns NULL.
1337 char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
1338 char *fieldbuf = NULL;
1339 const char *end_of_headers;
1340 const char *field_start;
1345 /* Should never happen, but sometimes we get stupid */
1346 if (rfc822 == NULL) return(NULL);
1347 if (fieldname == NULL) return(NULL);
1349 snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
1351 /* Locate the end of the headers, so we don't run past that point */
1352 end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
1353 if (end_of_headers == NULL) {
1354 end_of_headers = cbmstrcasestr(rfc822, "\n\n");
1356 if (end_of_headers == NULL) return (NULL);
1358 field_start = cbmstrcasestr(rfc822, fieldhdr);
1359 if (field_start == NULL) return(NULL);
1360 if (field_start > end_of_headers) return(NULL);
1362 fieldbuf = malloc(SIZ);
1363 strcpy(fieldbuf, "");
1366 ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
1367 while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
1368 strcat(fieldbuf, " ");
1369 cont = &fieldbuf[strlen(fieldbuf)];
1370 ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
1374 strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
1381 /*****************************************************************************
1382 * DIRECTORY MANAGEMENT FUNCTIONS *
1383 *****************************************************************************/
1386 * Generate the index key for an Internet e-mail address to be looked up
1389 void directory_key(char *key, char *addr) {
1393 for (i=0; !IsEmptyStr(&addr[i]); ++i) {
1394 if (!isspace(addr[i])) {
1395 key[keylen++] = tolower(addr[i]);
1400 syslog(LOG_DEBUG, "internet_addressing: directory key is <%s>", key);
1405 * Return nonzero if the supplied address is in one of "our" domains
1407 int IsDirectory(char *addr, int allow_masq_domains) {
1411 extract_token(domain, addr, 1, '@', sizeof domain);
1414 h = CtdlHostAlias(domain);
1416 if ( (h == hostalias_masq) && allow_masq_domains)
1419 if (h == hostalias_localhost) {
1429 * Add an Internet e-mail address to the directory for a user
1431 int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
1434 if (IsDirectory(internet_addr, 0) == 0) {
1437 syslog(LOG_DEBUG, "internet_addressing: create directory entry: %s --> %s", internet_addr, citadel_addr);
1438 directory_key(key, internet_addr);
1439 cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
1445 * Delete an Internet e-mail address from the directory.
1447 * (NOTE: we don't actually use or need the citadel_addr variable; it's merely
1448 * here because the callback API expects to be able to send it.)
1450 int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
1453 syslog(LOG_DEBUG, "internet_addressing: delete directory entry: %s --> %s", internet_addr, citadel_addr);
1454 directory_key(key, internet_addr);
1455 return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
1460 * Look up an Internet e-mail address in the directory.
1461 * On success: returns 0, and Citadel address stored in 'target'
1462 * On failure: returns nonzero
1464 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
1465 struct cdbdata *cdbrec;
1468 /* Dump it in there unchanged, just for kicks */
1469 if (target != NULL) {
1470 safestrncpy(target, internet_addr, targbuflen);
1473 /* Only do lookups for addresses with hostnames in them */
1474 if (num_tokens(internet_addr, '@') != 2) return(-1);
1476 /* Only do lookups for domains in the directory */
1477 if (IsDirectory(internet_addr, 0) == 0) return(-1);
1479 directory_key(key, internet_addr);
1480 cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key) );
1481 if (cdbrec != NULL) {
1482 if (target != NULL) {
1483 safestrncpy(target, cdbrec->ptr, targbuflen);
1494 * Harvest any email addresses that someone might want to have in their
1495 * "collected addresses" book.
1497 char *harvest_collected_addresses(struct CtdlMessage *msg) {
1500 char user[256], node[256], name[256];
1503 eMsgField field = 0;
1505 if (msg == NULL) return(NULL);
1509 if (!CM_IsEmpty(msg, eAuthor)) {
1510 strcat(addr, msg->cm_fields[eAuthor]);
1512 if (!CM_IsEmpty(msg, erFc822Addr)) {
1514 strcat(addr, msg->cm_fields[erFc822Addr]);
1516 if (IsDirectory(msg->cm_fields[erFc822Addr], 0)) {
1521 if (is_harvestable) {
1522 coll = strdup(addr);
1528 if (coll == NULL) return(NULL);
1530 /* Scan both the R (To) and Y (CC) fields */
1531 for (i = 0; i < 2; ++i) {
1532 if (i == 0) field = eRecipient;
1533 if (i == 1) field = eCarbonCopY;
1535 if (!CM_IsEmpty(msg, field)) {
1536 for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
1537 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
1538 if (strstr(addr, "=?") != NULL)
1539 utf8ify_rfc822_string(addr);
1540 process_rfc822_addr(addr, user, node, name);
1541 h = CtdlHostAlias(node);
1542 if (h != hostalias_localhost) {
1543 coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1544 if (coll == NULL) return(NULL);
1545 if (!IsEmptyStr(coll)) {
1555 if (IsEmptyStr(coll)) {
1564 * Helper function for CtdlRebuildDirectoryIndex()
1566 void CtdlRebuildDirectoryIndex_backend(char *username, void *data) {
1569 struct ctdluser usbuf;
1571 if (CtdlGetUser(&usbuf, username) != 0) {
1575 if ( (!IsEmptyStr(usbuf.fullname)) && (!IsEmptyStr(usbuf.emailaddrs)) ) {
1576 for (j=0; j<num_tokens(usbuf.emailaddrs, '|'); ++j) {
1577 char one_email[512];
1578 extract_token(one_email, usbuf.emailaddrs, j, '|', sizeof one_email);
1579 CtdlDirectoryAddUser(one_email, usbuf.fullname);
1586 * Initialize the directory database (erasing anything already there)
1588 void CtdlRebuildDirectoryIndex(void) {
1589 syslog(LOG_INFO, "internet_addressing: rebuilding email address directory index");
1590 cdb_trunc(CDB_DIRECTORY);
1591 ForEachUser(CtdlRebuildDirectoryIndex_backend, NULL);
1596 * Configure Internet email addresses for a user account, updating the Directory Index in the process
1598 void CtdlSetEmailAddressesForUser(char *requested_user, char *new_emailaddrs)
1600 struct ctdluser usbuf;
1604 if (CtdlGetUserLock(&usbuf, requested_user) != 0) { // We are relying on the fact that the DirectoryIndex functions don't lock.
1605 return; // Silently fail here if we can't acquire a lock on the user record.
1608 syslog(LOG_DEBUG, "internet_addressing: setting email addresses for <%s> to <%s>", usbuf.fullname, new_emailaddrs);
1610 /* Delete all of the existing directory index records for the user (easier this way) */
1611 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1612 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1613 CtdlDirectoryDelUser(buf, requested_user);
1616 strcpy(usbuf.emailaddrs, new_emailaddrs); // make it official.
1618 /* Index all of the new email addresses (they've already been sanitized) */
1619 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1620 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1621 CtdlDirectoryAddUser(buf, requested_user);
1624 CtdlPutUserLock(&usbuf);
1629 * Auto-generate an Internet email address for a user account
1631 void AutoGenerateEmailAddressForUser(struct ctdluser *user)
1633 char synthetic_email_addr[1024];
1637 for (i=0; u==0; ++i) {
1639 // first try just converting the user name to lowercase and replacing spaces with underscores
1640 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "%s@%s", user->fullname, CtdlGetConfigStr("c_fqdn"));
1641 for (j=0; ((synthetic_email_addr[j] != '\0')&&(synthetic_email_addr[j] != '@')); j++) {
1642 synthetic_email_addr[j] = tolower(synthetic_email_addr[j]);
1643 if (!isalnum(synthetic_email_addr[j])) {
1644 synthetic_email_addr[j] = '_';
1649 // then try 'ctdl' followed by the user number
1650 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08lx@%s", user->usernum, CtdlGetConfigStr("c_fqdn"));
1653 // oof. just keep trying other numbers until we find one
1654 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08x@%s", i, CtdlGetConfigStr("c_fqdn"));
1656 u = CtdlDirectoryLookup(NULL, synthetic_email_addr, 0);
1657 syslog(LOG_DEBUG, "user_ops: address <%s> lookup returned <%d>", synthetic_email_addr, u);
1660 CtdlSetEmailAddressesForUser(user->fullname, synthetic_email_addr);
1661 strncpy(CC->user.emailaddrs, synthetic_email_addr, sizeof(user->emailaddrs));
1662 syslog(LOG_DEBUG, "user_ops: auto-generated email address <%s> for <%s>", synthetic_email_addr, user->fullname);