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){};
268 char *inetcfg = NULL;
271 * Return nonzero if the supplied name is an alias for this host.
273 int CtdlHostAlias(char *fqdn) {
277 char host[256], type[256];
280 if (fqdn == NULL) return(hostalias_nomatch);
281 if (IsEmptyStr(fqdn)) return(hostalias_nomatch);
282 if (!strcasecmp(fqdn, "localhost")) return(hostalias_localhost);
283 if (!strcasecmp(fqdn, CtdlGetConfigStr("c_fqdn"))) return(hostalias_localhost);
284 if (!strcasecmp(fqdn, CtdlGetConfigStr("c_nodename"))) return(hostalias_localhost);
285 if (inetcfg == NULL) return(hostalias_nomatch);
287 config_lines = num_tokens(inetcfg, '\n');
288 for (i=0; i<config_lines; ++i) {
289 extract_token(buf, inetcfg, i, '\n', sizeof buf);
290 extract_token(host, buf, 0, '|', sizeof host);
291 extract_token(type, buf, 1, '|', sizeof type);
295 /* Process these in a specific order, in case there are multiple matches.
296 * We want localhost to override masq, for example.
299 if ( (!strcasecmp(type, "masqdomain")) && (!strcasecmp(fqdn, host))) {
300 found = hostalias_masq;
303 if ( (!strcasecmp(type, "localhost")) && (!strcasecmp(fqdn, host))) {
304 found = hostalias_localhost;
307 // "directory" used to be a distributed version of "localhost" but they're both the same now
308 if ( (!strcasecmp(type, "directory")) && (!strcasecmp(fqdn, host))) {
309 found = hostalias_localhost;
312 if (found) return(found);
314 return(hostalias_nomatch);
319 * Determine whether a given Internet address belongs to the current user
321 int CtdlIsMe(char *addr, int addr_buf_len)
323 struct recptypes *recp;
326 recp = validate_recipients(addr, NULL, 0);
327 if (recp == NULL) return(0);
329 if (recp->num_local == 0) {
330 free_recipients(recp);
334 for (i=0; i<recp->num_local; ++i) {
335 extract_token(addr, recp->recp_local, i, '|', addr_buf_len);
336 if (!strcasecmp(addr, CC->user.fullname)) {
337 free_recipients(recp);
342 free_recipients(recp);
347 /* If the last item in a list of recipients was truncated to a partial address,
348 * remove it completely in order to avoid choking library functions.
350 void sanitize_truncated_recipient(char *str)
353 if (num_tokens(str, ',') < 2) return;
355 int len = strlen(str);
356 if (len < 900) return;
357 if (len > 998) str[998] = 0;
359 char *cptr = strrchr(str, ',');
362 char *lptr = strchr(cptr, '<');
363 char *rptr = strchr(cptr, '>');
365 if ( (lptr) && (rptr) && (rptr > lptr) ) return;
372 * This function is self explanatory.
373 * (What can I say, I'm in a weird mood today...)
375 void remove_any_whitespace_to_the_left_or_right_of_at_symbol(char *name) {
379 for (ptr=name; *ptr; ++ptr) {
380 while ( (isspace(*ptr)) && (*(ptr+1)=='@') ) {
382 if (ptr > name) --ptr;
384 while ( (*ptr=='@') && (*(ptr+1)!=0) && (isspace(*(ptr+1))) ) {
385 strcpy(ptr+1, ptr+2);
391 // values that can be returned by expand_aliases()
393 EA_ERROR, // Can't send message due to bad address
394 EA_LOCAL, // Local message, do no network processing
395 EA_INTERNET // Convert msg and send as Internet mail
400 * Aliasing for network mail.
402 int expand_aliases(char *name) { /* process alias and routing info for mail */
408 char original_name[256];
409 safestrncpy(original_name, name, sizeof original_name);
412 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
413 stripallbut(name, '<', '>');
415 /* Hit the email address directory */
416 if (CtdlDirectoryLookup(aaa, name, sizeof aaa) == 0) {
420 //if (strcasecmp(original_name, name)) {
421 syslog(LOG_INFO, "internet_addressing: %s is being forwarded to %s", original_name, name);
424 /* Change "user @ xxx" to "user" if xxx is an alias for this host */
425 for (a=0; name[a] != '\0'; ++a) {
426 if (name[a] == '@') {
427 if (CtdlHostAlias(&name[a+1]) == hostalias_localhost) {
429 syslog(LOG_DEBUG, "internet_addressing: changed to <%s>", name);
435 /* determine local or remote type, see citadel.h */
436 at = haschar(name, '@');
437 if (at == 0) return(EA_LOCAL); /* no @'s - local address */
438 if (at > 1) return(EA_ERROR); /* >1 @'s - invalid address */
439 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
441 /* figure out the delivery mode */
442 extract_token(node, name, 1, '@', sizeof node);
444 /* If there are one or more dots in the nodename, we assume that it
445 * is an FQDN and will attempt SMTP delivery to the Internet.
447 if (haschar(node, '.') > 0) {
451 /* If we get to this point it's an invalid node name */
457 * Validate recipients, count delivery types and errors, and handle aliasing
458 * FIXME check for dupes!!!!!
460 * Returns 0 if all addresses are ok, ret->num_error = -1 if no addresses
461 * were specified, or the number of addresses found invalid.
463 * Caller needs to free the result using free_recipients()
465 struct recptypes *validate_recipients(const char *supplied_recipients, const char *RemoteIdentifier, int Flags) {
466 struct recptypes *ret;
467 char *recipients = NULL;
470 char this_recp_cooked[256];
476 struct ctdluser tempUS;
477 struct ctdlroom tempQR;
478 struct ctdlroom tempQR2;
484 ret = (struct recptypes *) malloc(sizeof(struct recptypes));
485 if (ret == NULL) return(NULL);
487 /* Set all strings to null and numeric values to zero */
488 memset(ret, 0, sizeof(struct recptypes));
490 if (supplied_recipients == NULL) {
491 recipients = strdup("");
494 recipients = strdup(supplied_recipients);
497 /* Allocate some memory. Yes, this allocates 500% more memory than we will
498 * actually need, but it's healthier for the heap than doing lots of tiny
499 * realloc() calls instead.
501 len = strlen(recipients) + 1024;
502 ret->errormsg = malloc(len);
503 ret->recp_local = malloc(len);
504 ret->recp_internet = malloc(len);
505 ret->recp_room = malloc(len);
506 ret->display_recp = malloc(len);
507 ret->recp_orgroom = malloc(len);
508 org_recp = malloc(len);
510 ret->errormsg[0] = 0;
511 ret->recp_local[0] = 0;
512 ret->recp_internet[0] = 0;
513 ret->recp_room[0] = 0;
514 ret->recp_orgroom[0] = 0;
515 ret->display_recp[0] = 0;
517 ret->recptypes_magic = RECPTYPES_MAGIC;
519 /* Change all valid separator characters to commas */
520 for (i=0; !IsEmptyStr(&recipients[i]); ++i) {
521 if ((recipients[i] == ';') || (recipients[i] == '|')) {
526 /* Now start extracting recipients... */
527 Array *recp_array = array_new(1024);
528 while (!IsEmptyStr(recipients)) {
529 for (i=0; i<=strlen(recipients); ++i) {
530 if (recipients[i] == '\"') in_quotes = 1 - in_quotes;
531 if ( ( (recipients[i] == ',') && (!in_quotes) ) || (recipients[i] == 0) ) {
532 safestrncpy(this_recp, recipients, i+1);
534 if (recipients[i] == ',') {
535 strcpy(recipients, &recipients[i+1]);
538 strcpy(recipients, "");
545 if (!IsEmptyStr(this_recp)) {
546 syslog(LOG_DEBUG, "internet_addressing: evaluating recipient: %s", this_recp);
547 array_append(recp_array, this_recp);
551 for (int r=0; r<array_len(recp_array); ++r) {
552 strcpy(this_recp, (char *)array_get_element_at(recp_array, r));
554 strcpy(org_recp, this_recp);
558 // To prevent endless aliasing loops, we will only do this three times.
559 for (int alias_loop=0; alias_loop<3; ++alias_loop) {
560 mailtype = expand_aliases(this_recp);
565 // Hmm. Is this still needed? It changes underscores to spaces, but maybe we don't
566 // need it anymore now that we index local user names without alphanumerics.
567 for (j = 0; !IsEmptyStr(&this_recp[j]); ++j) {
568 if (this_recp[j]=='_') {
569 this_recp_cooked[j] = ' ';
572 this_recp_cooked[j] = this_recp[j];
575 this_recp_cooked[j] = '\0';
582 if (!strcasecmp(this_recp, "sysop")) {
584 strcpy(this_recp, CtdlGetConfigStr("c_aideroom"));
585 if (!IsEmptyStr(ret->recp_room)) {
586 strcat(ret->recp_room, "|");
588 strcat(ret->recp_room, this_recp);
590 else if ( (!strncasecmp(this_recp, "room_", 5)) && (!CtdlGetRoom(&tempQR, &this_recp_cooked[5])) ) {
592 /* Save room so we can restore it later */
596 /* Check permissions to send mail to this room */
597 err = CtdlDoIHavePermissionToPostInThisRoom(
602 0 /* 0 = not a reply */
610 if (!IsEmptyStr(ret->recp_room)) {
611 strcat(ret->recp_room, "|");
613 strcat(ret->recp_room, &this_recp_cooked[5]);
615 if (!IsEmptyStr(ret->recp_orgroom)) {
616 strcat(ret->recp_orgroom, "|");
618 strcat(ret->recp_orgroom, org_recp);
622 /* Restore room in case something needs it */
626 else if (CtdlGetUser(&tempUS, this_recp) == 0) {
628 strcpy(this_recp, tempUS.fullname);
629 if (!IsEmptyStr(ret->recp_local)) {
630 strcat(ret->recp_local, "|");
632 strcat(ret->recp_local, this_recp);
634 else if (CtdlGetUser(&tempUS, this_recp_cooked) == 0) {
636 strcpy(this_recp, tempUS.fullname);
637 if (!IsEmptyStr(ret->recp_local)) {
638 strcat(ret->recp_local, "|");
640 strcat(ret->recp_local, this_recp);
648 /* Yes, you're reading this correctly: if the target
649 * domain points back to the local system,
650 * the address is invalid. That's
651 * because if the address were valid, we would have
652 * already translated it to a local address by now.
654 if (IsDirectory(this_recp, 0)) {
660 if (!IsEmptyStr(ret->recp_internet)) {
661 strcat(ret->recp_internet, "|");
663 strcat(ret->recp_internet, this_recp);
672 if (IsEmptyStr(errmsg)) {
673 snprintf(append, sizeof append, "Invalid recipient: %s", this_recp);
676 snprintf(append, sizeof append, "%s", errmsg);
678 if ( (strlen(ret->errormsg) + strlen(append) + 3) < SIZ) {
679 if (!IsEmptyStr(ret->errormsg)) {
680 strcat(ret->errormsg, "; ");
682 strcat(ret->errormsg, append);
686 if (IsEmptyStr(ret->display_recp)) {
687 strcpy(append, this_recp);
690 snprintf(append, sizeof append, ", %s", this_recp);
692 if ( (strlen(ret->display_recp)+strlen(append)) < SIZ) {
693 strcat(ret->display_recp, append);
699 if ( (ret->num_local + ret->num_internet + ret->num_room + ret->num_error) == 0) {
700 ret->num_error = (-1);
701 strcpy(ret->errormsg, "No recipients specified.");
704 syslog(LOG_DEBUG, "internet_addressing: validate_recipients() = %d local, %d room, %d SMTP, %d error",
705 ret->num_local, ret->num_room, ret->num_internet, ret->num_error
709 array_free(recp_array);
716 * Destructor for recptypes
718 void free_recipients(struct recptypes *valid) {
724 if (valid->recptypes_magic != RECPTYPES_MAGIC) {
725 syslog(LOG_ERR, "internet_addressing: attempt to call free_recipients() on some other data type!");
729 if (valid->errormsg != NULL) free(valid->errormsg);
730 if (valid->recp_local != NULL) free(valid->recp_local);
731 if (valid->recp_internet != NULL) free(valid->recp_internet);
732 if (valid->recp_room != NULL) free(valid->recp_room);
733 if (valid->recp_orgroom != NULL) free(valid->recp_orgroom);
734 if (valid->display_recp != NULL) free(valid->display_recp);
735 if (valid->bounce_to != NULL) free(valid->bounce_to);
736 if (valid->envelope_from != NULL) free(valid->envelope_from);
737 if (valid->sending_room != NULL) free(valid->sending_room);
742 char *qp_encode_email_addrs(char *source) {
743 char *user, *node, *name;
744 const char headerStr[] = "=?UTF-8?Q?";
748 int need_to_encode = 0;
754 long nAddrPtrMax = 50;
759 if (source == NULL) return source;
760 if (IsEmptyStr(source)) return source;
761 syslog(LOG_DEBUG, "internet_addressing: qp_encode_email_addrs <%s>", source);
763 AddrPtr = malloc (sizeof (long) * nAddrPtrMax);
764 AddrUtf8 = malloc (sizeof (long) * nAddrPtrMax);
765 memset(AddrUtf8, 0, sizeof (long) * nAddrPtrMax);
768 while (!IsEmptyStr (&source[i])) {
769 if (nColons >= nAddrPtrMax){
772 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
773 memcpy (ptr, AddrPtr, sizeof (long) * nAddrPtrMax);
774 free (AddrPtr), AddrPtr = ptr;
776 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
777 memset(&ptr[nAddrPtrMax], 0, sizeof (long) * nAddrPtrMax);
779 memcpy (ptr, AddrUtf8, sizeof (long) * nAddrPtrMax);
780 free (AddrUtf8), AddrUtf8 = ptr;
783 if (((unsigned char) source[i] < 32) || ((unsigned char) source[i] > 126)) {
785 AddrUtf8[nColons] = 1;
787 if (source[i] == '"') {
788 InQuotes = !InQuotes;
790 if (!InQuotes && source[i] == ',') {
791 AddrPtr[nColons] = i;
796 if (need_to_encode == 0) {
803 EncodedMaxLen = nColons * (sizeof(headerStr) + 3) + SourceLen * 3;
804 Encoded = (char*) malloc (EncodedMaxLen);
806 for (i = 0; i < nColons; i++) {
807 source[AddrPtr[i]++] = '\0';
809 /* TODO: if libidn, this might get larger*/
810 user = malloc(SourceLen + 1);
811 node = malloc(SourceLen + 1);
812 name = malloc(SourceLen + 1);
816 for (i = 0; i < nColons && nPtr != NULL; i++) {
817 nmax = EncodedMaxLen - (nPtr - Encoded);
819 process_rfc822_addr(&source[AddrPtr[i]], user, node, name);
820 /* TODO: libIDN here ! */
821 if (IsEmptyStr(name)) {
822 n = snprintf(nPtr, nmax, (i==0)?"%s@%s" : ",%s@%s", user, node);
825 EncodedName = rfc2047encode(name, strlen(name));
826 n = snprintf(nPtr, nmax, (i==0)?"%s <%s@%s>" : ",%s <%s@%s>", EncodedName, user, node);
831 n = snprintf(nPtr, nmax, (i==0)?"%s" : ",%s", &source[AddrPtr[i]]);
837 ptr = (char*) malloc(EncodedMaxLen * 2);
838 memcpy(ptr, Encoded, EncodedMaxLen);
839 nnPtr = ptr + (nPtr - Encoded), nPtr = nnPtr;
840 free(Encoded), Encoded = ptr;
842 i--; /* do it once more with properly lengthened buffer */
845 for (i = 0; i < nColons; i++)
846 source[--AddrPtr[i]] = ',';
858 * Unfold a multi-line field into a single line, removing multi-whitespaces
860 void unfold_rfc822_field(char **field, char **FieldEnd)
863 char *pField = *field;
865 char *pFieldEnd = *FieldEnd;
867 while (isspace(*pField))
869 /* remove leading/trailing whitespace */
872 while (isspace(*pFieldEnd))
875 *FieldEnd = pFieldEnd;
876 /* convert non-space whitespace to spaces, and remove double blanks */
877 for (sField = *field = pField;
881 if ((*sField=='\r') || (*sField=='\n'))
884 while ( ( (*(sField + offset) == '\r') || (*(sField + offset) == '\n' )) && (sField + offset < pFieldEnd) ) {
891 if (*sField=='\"') quote = 1 - quote;
893 if (isspace(*sField)) {
898 while ((sField < pFieldEnd) &&
903 else *pField = *sField;
905 else *pField = *sField;
909 *FieldEnd = pField - 1;
914 * Split an RFC822-style address into userid, host, and full name
917 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name) {
921 strcpy(node, CtdlGetConfigStr("c_fqdn"));
924 if (rfc822 == NULL) return;
926 /* extract full name - first, it's From minus <userid> */
927 strcpy(name, rfc822);
928 stripout(name, '<', '>');
930 /* strip anything to the left of a bang */
931 while ((!IsEmptyStr(name)) && (haschar(name, '!') > 0))
932 strcpy(name, &name[1]);
934 /* and anything to the right of a @ or % */
935 for (a = 0; name[a] != '\0'; ++a) {
936 if (name[a] == '@') {
940 if (name[a] == '%') {
946 /* but if there are parentheses, that changes the rules... */
947 if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
948 strcpy(name, rfc822);
949 stripallbut(name, '(', ')');
952 /* but if there are a set of quotes, that supersedes everything */
953 if (haschar(rfc822, 34) == 2) {
954 strcpy(name, rfc822);
955 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
956 strcpy(&name[0], &name[1]);
958 strcpy(&name[0], &name[1]);
959 for (a = 0; name[a] != '\0'; ++a)
965 /* extract user id */
966 strcpy(user, rfc822);
968 /* first get rid of anything in parens */
969 stripout(user, '(', ')');
971 /* if there's a set of angle brackets, strip it down to that */
972 if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
973 stripallbut(user, '<', '>');
976 /* strip anything to the left of a bang */
977 while ((!IsEmptyStr(user)) && (haschar(user, '!') > 0))
978 strcpy(user, &user[1]);
980 /* and anything to the right of a @ or % */
981 for (a = 0; user[a] != '\0'; ++a) {
982 if (user[a] == '@') {
986 if (user[a] == '%') {
993 /* extract node name */
994 strcpy(node, rfc822);
996 /* first get rid of anything in parens */
997 stripout(node, '(', ')');
999 /* if there's a set of angle brackets, strip it down to that */
1000 if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
1001 stripallbut(node, '<', '>');
1004 /* If no node specified, tack ours on instead */
1006 (haschar(node, '@')==0)
1007 && (haschar(node, '%')==0)
1008 && (haschar(node, '!')==0)
1010 strcpy(node, CtdlGetConfigStr("c_nodename"));
1014 /* strip anything to the left of a @ */
1015 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0))
1016 strcpy(node, &node[1]);
1018 /* strip anything to the left of a % */
1019 while ((!IsEmptyStr(node)) && (haschar(node, '%') > 0))
1020 strcpy(node, &node[1]);
1022 /* reduce multiple system bang paths to node!user */
1023 while ((!IsEmptyStr(node)) && (haschar(node, '!') > 1))
1024 strcpy(node, &node[1]);
1026 /* now get rid of the user portion of a node!user string */
1027 for (a = 0; node[a] != '\0'; ++a)
1028 if (node[a] == '!') {
1034 /* strip leading and trailing spaces in all strings */
1039 /* If we processed a string that had the address in angle brackets
1040 * but no name outside the brackets, we now have an empty name. In
1041 * this case, use the user portion of the address as the name.
1043 if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
1050 * convert_field() is a helper function for convert_internet_message().
1051 * Given start/end positions for an rfc822 field, it converts it to a Citadel
1052 * field if it wants to, and unfolds it if necessary.
1054 * Returns 1 if the field was converted and inserted into the Citadel message
1055 * structure, implying that the source field should be removed from the
1058 int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
1059 char *key, *value, *valueend;
1063 const char *colonpos = NULL;
1072 for (pos = end; pos >= beg; pos--) {
1073 if (*pos == ':') colonpos = pos;
1076 if (colonpos == NULL) return(0); /* no colon? not a valid header line */
1079 key = malloc(len + 2);
1080 memcpy(key, beg, len + 1);
1082 valueend = key + len;
1083 * ( key + (colonpos - beg) ) = '\0';
1084 value = &key[(colonpos - beg) + 1];
1085 /* printf("Header: [%s]\nValue: [%s]\n", key, value); */
1086 unfold_rfc822_field(&value, &valueend);
1087 valuelen = valueend - value + 1;
1088 /* printf("UnfoldedValue: [%s]\n", value); */
1091 * Here's the big rfc822-to-citadel loop.
1094 /* Date/time is converted into a unix timestamp. If the conversion
1095 * fails, we replace it with the time the message arrived locally.
1097 if (!strcasecmp(key, "Date")) {
1098 parsed_date = parsedate(value);
1099 if (parsed_date < 0L) parsed_date = time(NULL);
1101 if (CM_IsEmpty(msg, eTimestamp))
1102 CM_SetFieldLONG(msg, eTimestamp, parsed_date);
1106 else if (!strcasecmp(key, "From")) {
1107 process_rfc822_addr(value, user, node, name);
1108 syslog(LOG_DEBUG, "internet_addressing: converted to <%s@%s> (%s)", user, node, name);
1109 snprintf(addr, sizeof(addr), "%s@%s", user, node);
1110 if (CM_IsEmpty(msg, eAuthor) && !IsEmptyStr(name)) {
1111 CM_SetField(msg, eAuthor, name, -1);
1113 if (CM_IsEmpty(msg, erFc822Addr) && !IsEmptyStr(addr)) {
1114 CM_SetField(msg, erFc822Addr, addr, -1);
1119 else if (!strcasecmp(key, "Subject")) {
1120 if (CM_IsEmpty(msg, eMsgSubject))
1121 CM_SetField(msg, eMsgSubject, value, valuelen);
1125 else if (!strcasecmp(key, "List-ID")) {
1126 if (CM_IsEmpty(msg, eListID))
1127 CM_SetField(msg, eListID, value, valuelen);
1131 else if (!strcasecmp(key, "To")) {
1132 if (CM_IsEmpty(msg, eRecipient))
1133 CM_SetField(msg, eRecipient, value, valuelen);
1137 else if (!strcasecmp(key, "CC")) {
1138 if (CM_IsEmpty(msg, eCarbonCopY))
1139 CM_SetField(msg, eCarbonCopY, value, valuelen);
1143 else if (!strcasecmp(key, "Message-ID")) {
1144 if (!CM_IsEmpty(msg, emessageId)) {
1145 syslog(LOG_WARNING, "internet_addressing: duplicate message id");
1152 pValueLen = valuelen;
1153 /* Strip angle brackets */
1154 while (haschar(pValue, '<') > 0) {
1159 for (i = 0; i <= pValueLen; ++i)
1160 if (pValue[i] == '>') {
1165 CM_SetField(msg, emessageId, pValue, pValueLen);
1171 else if (!strcasecmp(key, "Return-Path")) {
1172 if (CM_IsEmpty(msg, eMessagePath))
1173 CM_SetField(msg, eMessagePath, value, valuelen);
1177 else if (!strcasecmp(key, "Envelope-To")) {
1178 if (CM_IsEmpty(msg, eenVelopeTo))
1179 CM_SetField(msg, eenVelopeTo, value, valuelen);
1183 else if (!strcasecmp(key, "References")) {
1184 CM_SetField(msg, eWeferences, value, valuelen);
1188 else if (!strcasecmp(key, "Reply-To")) {
1189 CM_SetField(msg, eReplyTo, value, valuelen);
1193 else if (!strcasecmp(key, "In-reply-to")) {
1194 if (CM_IsEmpty(msg, eWeferences)) /* References: supersedes In-reply-to: */
1195 CM_SetField(msg, eWeferences, value, valuelen);
1201 /* Clean up and move on. */
1202 free(key); /* Don't free 'value', it's actually the same buffer */
1208 * Convert RFC822 references format (References) to Citadel references format (Weferences)
1210 void convert_references_to_wefewences(char *str) {
1211 int bracket_nesting = 0;
1213 char *moveptr = NULL;
1220 if (bracket_nesting < 0) bracket_nesting = 0;
1222 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
1226 else if (bracket_nesting > 0) {
1232 *moveptr = *(moveptr+1);
1236 if (ch == '<') ++bracket_nesting;
1243 * Convert an RFC822 message (headers + body) to a CtdlMessage structure.
1244 * NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
1245 * will be deallocated when CM_Free() is called. Therefore, the
1246 * supplied buffer should be DEREFERENCED. It should not be freed or used
1249 struct CtdlMessage *convert_internet_message(char *rfc822) {
1250 StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
1252 return convert_internet_message_buf(&RFCBuf);
1256 struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822)
1258 struct CtdlMessage *msg;
1259 const char *pos, *beg, *end, *totalend;
1260 int done, alldone = 0;
1262 StrBuf *OtherHeaders;
1264 msg = malloc(sizeof(struct CtdlMessage));
1265 if (msg == NULL) return msg;
1267 memset(msg, 0, sizeof(struct CtdlMessage));
1268 msg->cm_magic = CTDLMESSAGE_MAGIC; /* self check */
1269 msg->cm_anon_type = 0; /* never anonymous */
1270 msg->cm_format_type = FMT_RFC822; /* internet message */
1272 pos = ChrPtr(*rfc822);
1273 totalend = pos + StrLength(*rfc822);
1275 OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
1279 /* Locate beginning and end of field, keeping in mind that
1280 * some fields might be multiline
1284 while ((end < totalend) &&
1289 if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) )
1294 /* done with headers? */
1296 ( (*(pos+1)=='\n') ||
1302 if (pos >= (totalend - 1) )
1312 /* At this point we have a field. Are we interested in it? */
1313 converted = convert_field(msg, beg, end);
1315 /* Strip the field out of the RFC822 header if we used it */
1317 StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
1318 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1321 /* If we've hit the end of the message, bail out */
1322 if (pos >= totalend)
1325 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1327 StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
1329 CM_SetAsFieldSB(msg, eMesageText, &OtherHeaders);
1331 /* Follow-up sanity checks... */
1333 /* If there's no timestamp on this message, set it to now. */
1334 if (CM_IsEmpty(msg, eTimestamp)) {
1335 CM_SetFieldLONG(msg, eTimestamp, time(NULL));
1338 /* If a W (references, or rather, Wefewences) field is present, we
1339 * have to convert it from RFC822 format to Citadel format.
1341 if (!CM_IsEmpty(msg, eWeferences)) {
1343 convert_references_to_wefewences(msg->cm_fields[eWeferences]);
1351 * Look for a particular header field in an RFC822 message text. If the
1352 * requested field is found, it is unfolded (if necessary) and returned to
1353 * the caller. The field name is stripped out, leaving only its contents.
1354 * The caller is responsible for freeing the returned buffer. If the requested
1355 * field is not present, or anything else goes wrong, it returns NULL.
1357 char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
1358 char *fieldbuf = NULL;
1359 const char *end_of_headers;
1360 const char *field_start;
1365 /* Should never happen, but sometimes we get stupid */
1366 if (rfc822 == NULL) return(NULL);
1367 if (fieldname == NULL) return(NULL);
1369 snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
1371 /* Locate the end of the headers, so we don't run past that point */
1372 end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
1373 if (end_of_headers == NULL) {
1374 end_of_headers = cbmstrcasestr(rfc822, "\n\n");
1376 if (end_of_headers == NULL) return (NULL);
1378 field_start = cbmstrcasestr(rfc822, fieldhdr);
1379 if (field_start == NULL) return(NULL);
1380 if (field_start > end_of_headers) return(NULL);
1382 fieldbuf = malloc(SIZ);
1383 strcpy(fieldbuf, "");
1386 ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
1387 while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
1388 strcat(fieldbuf, " ");
1389 cont = &fieldbuf[strlen(fieldbuf)];
1390 ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
1394 strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
1401 /*****************************************************************************
1402 * DIRECTORY MANAGEMENT FUNCTIONS *
1403 *****************************************************************************/
1406 * Generate the index key for an Internet e-mail address to be looked up
1409 void directory_key(char *key, char *addr) {
1413 for (i=0; !IsEmptyStr(&addr[i]); ++i) {
1414 if (!isspace(addr[i])) {
1415 key[keylen++] = tolower(addr[i]);
1420 syslog(LOG_DEBUG, "internet_addressing: directory key is <%s>", key);
1425 * Return nonzero if the supplied address is in one of "our" domains
1427 int IsDirectory(char *addr, int allow_masq_domains) {
1431 extract_token(domain, addr, 1, '@', sizeof domain);
1434 h = CtdlHostAlias(domain);
1436 if ( (h == hostalias_masq) && allow_masq_domains)
1439 if (h == hostalias_localhost) {
1449 * Add an Internet e-mail address to the directory for a user
1451 int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
1454 if (IsDirectory(internet_addr, 0) == 0) {
1457 syslog(LOG_DEBUG, "internet_addressing: create directory entry: %s --> %s", internet_addr, citadel_addr);
1458 directory_key(key, internet_addr);
1459 cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
1465 * Delete an Internet e-mail address from the directory.
1467 * (NOTE: we don't actually use or need the citadel_addr variable; it's merely
1468 * here because the callback API expects to be able to send it.)
1470 int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
1473 syslog(LOG_DEBUG, "internet_addressing: delete directory entry: %s --> %s", internet_addr, citadel_addr);
1474 directory_key(key, internet_addr);
1475 return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
1480 * Look up an Internet e-mail address in the directory.
1481 * On success: returns 0, and Citadel address stored in 'target'
1482 * On failure: returns nonzero
1484 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
1485 struct cdbdata *cdbrec;
1488 /* Dump it in there unchanged, just for kicks */
1489 if (target != NULL) {
1490 safestrncpy(target, internet_addr, targbuflen);
1493 /* Only do lookups for addresses with hostnames in them */
1494 if (num_tokens(internet_addr, '@') != 2) return(-1);
1496 /* Only do lookups for domains in the directory */
1497 if (IsDirectory(internet_addr, 0) == 0) return(-1);
1499 directory_key(key, internet_addr);
1500 cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key) );
1501 if (cdbrec != NULL) {
1502 if (target != NULL) {
1503 safestrncpy(target, cdbrec->ptr, targbuflen);
1514 * Harvest any email addresses that someone might want to have in their
1515 * "collected addresses" book.
1517 char *harvest_collected_addresses(struct CtdlMessage *msg) {
1520 char user[256], node[256], name[256];
1523 eMsgField field = 0;
1525 if (msg == NULL) return(NULL);
1529 if (!CM_IsEmpty(msg, eAuthor)) {
1530 strcat(addr, msg->cm_fields[eAuthor]);
1532 if (!CM_IsEmpty(msg, erFc822Addr)) {
1534 strcat(addr, msg->cm_fields[erFc822Addr]);
1536 if (IsDirectory(msg->cm_fields[erFc822Addr], 0)) {
1541 if (is_harvestable) {
1542 coll = strdup(addr);
1548 if (coll == NULL) return(NULL);
1550 /* Scan both the R (To) and Y (CC) fields */
1551 for (i = 0; i < 2; ++i) {
1552 if (i == 0) field = eRecipient;
1553 if (i == 1) field = eCarbonCopY;
1555 if (!CM_IsEmpty(msg, field)) {
1556 for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
1557 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
1558 if (strstr(addr, "=?") != NULL)
1559 utf8ify_rfc822_string(addr);
1560 process_rfc822_addr(addr, user, node, name);
1561 h = CtdlHostAlias(node);
1562 if (h != hostalias_localhost) {
1563 coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1564 if (coll == NULL) return(NULL);
1565 if (!IsEmptyStr(coll)) {
1575 if (IsEmptyStr(coll)) {
1584 * Helper function for CtdlRebuildDirectoryIndex()
1586 void CtdlRebuildDirectoryIndex_backend(char *username, void *data) {
1589 struct ctdluser usbuf;
1591 if (CtdlGetUser(&usbuf, username) != 0) {
1595 if ( (!IsEmptyStr(usbuf.fullname)) && (!IsEmptyStr(usbuf.emailaddrs)) ) {
1596 for (j=0; j<num_tokens(usbuf.emailaddrs, '|'); ++j) {
1597 char one_email[512];
1598 extract_token(one_email, usbuf.emailaddrs, j, '|', sizeof one_email);
1599 CtdlDirectoryAddUser(one_email, usbuf.fullname);
1606 * Initialize the directory database (erasing anything already there)
1608 void CtdlRebuildDirectoryIndex(void) {
1609 syslog(LOG_INFO, "internet_addressing: rebuilding email address directory index");
1610 cdb_trunc(CDB_DIRECTORY);
1611 ForEachUser(CtdlRebuildDirectoryIndex_backend, NULL);
1616 * Configure Internet email addresses for a user account, updating the Directory Index in the process
1618 void CtdlSetEmailAddressesForUser(char *requested_user, char *new_emailaddrs)
1620 struct ctdluser usbuf;
1624 if (CtdlGetUserLock(&usbuf, requested_user) != 0) { // We are relying on the fact that the DirectoryIndex functions don't lock.
1625 return; // Silently fail here if we can't acquire a lock on the user record.
1628 syslog(LOG_DEBUG, "internet_addressing: setting email addresses for <%s> to <%s>", usbuf.fullname, new_emailaddrs);
1630 /* Delete all of the existing directory index records for the user (easier this way) */
1631 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1632 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1633 CtdlDirectoryDelUser(buf, requested_user);
1636 strcpy(usbuf.emailaddrs, new_emailaddrs); // make it official.
1638 /* Index all of the new email addresses (they've already been sanitized) */
1639 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1640 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1641 CtdlDirectoryAddUser(buf, requested_user);
1644 CtdlPutUserLock(&usbuf);
1649 * Auto-generate an Internet email address for a user account
1651 void AutoGenerateEmailAddressForUser(struct ctdluser *user)
1653 char synthetic_email_addr[1024];
1657 for (i=0; u==0; ++i) {
1659 // first try just converting the user name to lowercase and replacing spaces with underscores
1660 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "%s@%s", user->fullname, CtdlGetConfigStr("c_fqdn"));
1661 for (j=0; ((synthetic_email_addr[j] != '\0')&&(synthetic_email_addr[j] != '@')); j++) {
1662 synthetic_email_addr[j] = tolower(synthetic_email_addr[j]);
1663 if (!isalnum(synthetic_email_addr[j])) {
1664 synthetic_email_addr[j] = '_';
1669 // then try 'ctdl' followed by the user number
1670 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08lx@%s", user->usernum, CtdlGetConfigStr("c_fqdn"));
1673 // oof. just keep trying other numbers until we find one
1674 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08x@%s", i, CtdlGetConfigStr("c_fqdn"));
1676 u = CtdlDirectoryLookup(NULL, synthetic_email_addr, 0);
1677 syslog(LOG_DEBUG, "user_ops: address <%s> lookup returned <%d>", synthetic_email_addr, u);
1680 CtdlSetEmailAddressesForUser(user->fullname, synthetic_email_addr);
1681 strncpy(CC->user.emailaddrs, synthetic_email_addr, sizeof(user->emailaddrs));
1682 syslog(LOG_DEBUG, "user_ops: auto-generated email address <%s> for <%s>", synthetic_email_addr, user->fullname);