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"
47 /* This is the non-define version in case it is needed for debugging */
49 inline void FindNextEnd (char *bptr, char *end)
51 /* Find the next ?Q? */
52 end = strchr(bptr + 2, '?');
53 if (end == NULL) return NULL;
54 if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) &&
55 (*(end + 2) == '?')) {
56 /* skip on to the end of the cluster, the next ?= */
57 end = strstr(end + 3, "?=");
60 /* sort of half valid encoding, try to find an end. */
61 end = strstr(bptr, "?=");
65 #define FindNextEnd(bptr, end) { \
66 end = strchr(bptr + 2, '?'); \
68 if (((*(end + 1) == 'B') || (*(end + 1) == 'Q')) && (*(end + 2) == '?')) { \
69 end = strstr(end + 3, "?="); \
70 } else end = strstr(bptr, "?="); \
75 * Handle subjects with RFC2047 encoding such as:
76 * =?koi8-r?B?78bP0s3Mxc7JxSDXz9rE1dvO2c3JINvB0sHNySDP?=
78 void utf8ify_rfc822_string(char *buf) {
79 char *start, *end, *next, *nextend, *ptr;
84 iconv_t ic = (iconv_t)(-1) ;
85 char *ibuf; // Buffer of characters to be converted
86 char *obuf; // Buffer for converted characters
87 size_t ibuflen; // Length of input buffer
88 size_t obuflen; // Length of output buffer
89 char *isav; // Saved pointer to input buffer
90 char *osav; // Saved pointer to output buffer
93 int illegal_non_rfc2047_encoding = 0;
95 /* Sometimes, badly formed messages contain strings which were simply
96 * written out directly in some foreign character set instead of
97 * using RFC2047 encoding. This is illegal but we will attempt to
98 * handle it anyway by converting from a user-specified default
99 * charset to UTF-8 if we see any nonprintable characters.
102 for (i=0; i<len; ++i) {
103 if ((buf[i] < 32) || (buf[i] > 126)) {
104 illegal_non_rfc2047_encoding = 1;
105 i = len; // take a shortcut, it won't be more than one.
108 if (illegal_non_rfc2047_encoding) {
109 const char *default_header_charset = "iso-8859-1";
110 if ( (strcasecmp(default_header_charset, "UTF-8")) && (strcasecmp(default_header_charset, "us-ascii")) ) {
111 ctdl_iconv_open("UTF-8", default_header_charset, &ic);
112 if (ic != (iconv_t)(-1) ) {
115 safestrncpy(ibuf, buf, 1024);
116 ibuflen = strlen(ibuf);
118 obuf = (char *) malloc(obuflen);
120 iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
121 osav[1024-obuflen] = 0;
130 /* pre evaluate the first pair */
131 nextend = end = NULL;
133 start = strstr(buf, "=?");
135 FindNextEnd (start, end);
137 while ((start != NULL) && (end != NULL)) {
138 next = strstr(end, "=?");
140 FindNextEnd(next, nextend);
144 /* did we find two partitions */
145 if ((next != NULL) && ((next - end) > 2)) {
147 while ((ptr < next) &&
153 /* did we find a gab just filled with blanks? */
158 len - (next - start));
160 /* now terminate the gab at the end */
161 delta = (next - end) - 2;
165 /* move next to its new location. */
170 /* our next-pair is our new first pair now. */
175 // Now we handle foreign character sets properly encoded in RFC2047 format.
176 start = strstr(buf, "=?");
177 FindNextEnd((start != NULL)? start : buf, end);
178 while (start != NULL && end != NULL && end > start) {
179 extract_token(charset, start, 1, '?', sizeof charset);
180 extract_token(encoding, start, 2, '?', sizeof encoding);
181 extract_token(istr, start, 3, '?', sizeof istr);
185 if (!strcasecmp(encoding, "B")) { // base64
186 ibuflen = CtdlDecodeBase64(ibuf, istr, strlen(istr));
188 else if (!strcasecmp(encoding, "Q")) { // quoted-printable
195 if (istr[pos] == '_') istr[pos] = ' ';
198 ibuflen = CtdlDecodeQuotedPrintable(ibuf, istr, len);
201 strcpy(ibuf, istr); // unknown encoding
202 ibuflen = strlen(istr);
205 ctdl_iconv_open("UTF-8", charset, &ic);
206 if (ic != (iconv_t)(-1) ) {
208 obuf = (char *) malloc(obuflen);
210 iconv(ic, &ibuf, &ibuflen, &obuf, &obuflen);
211 osav[1024-obuflen] = 0;
216 remove_token(end, 0, '?');
217 remove_token(end, 0, '?');
218 remove_token(end, 0, '?');
219 remove_token(end, 0, '?');
220 strcpy(end, &end[1]);
222 snprintf(newbuf, sizeof newbuf, "%s%s%s", buf, osav, end);
231 remove_token(end, 0, '?');
232 remove_token(end, 0, '?');
233 remove_token(end, 0, '?');
234 remove_token(end, 0, '?');
235 strcpy(end, &end[1]);
237 snprintf(newbuf, sizeof newbuf, "%s(unreadable)%s", buf, end);
244 * Since spammers will go to all sorts of absurd lengths to get their
245 * messages through, there are LOTS of corrupt headers out there.
246 * So, prevent a really badly formed RFC2047 header from throwing
247 * this function into an infinite loop.
250 if (passes > 20) return;
252 start = strstr(buf, "=?");
253 FindNextEnd((start != NULL)? start : buf, end);
258 inline void utf8ify_rfc822_string(char *a){};
263 char *inetcfg = NULL;
266 * Return nonzero if the supplied name is an alias for this host.
268 int CtdlHostAlias(char *fqdn) {
272 char host[256], type[256];
275 if (fqdn == NULL) return(hostalias_nomatch);
276 if (IsEmptyStr(fqdn)) return(hostalias_nomatch);
277 if (!strcasecmp(fqdn, "localhost")) return(hostalias_localhost);
278 if (!strcasecmp(fqdn, CtdlGetConfigStr("c_fqdn"))) return(hostalias_localhost);
279 if (!strcasecmp(fqdn, CtdlGetConfigStr("c_nodename"))) return(hostalias_localhost);
280 if (inetcfg == NULL) return(hostalias_nomatch);
282 config_lines = num_tokens(inetcfg, '\n');
283 for (i=0; i<config_lines; ++i) {
284 extract_token(buf, inetcfg, i, '\n', sizeof buf);
285 extract_token(host, buf, 0, '|', sizeof host);
286 extract_token(type, buf, 1, '|', sizeof type);
290 /* Process these in a specific order, in case there are multiple matches.
291 * We want localhost to override masq, for example.
294 if ( (!strcasecmp(type, "masqdomain")) && (!strcasecmp(fqdn, host))) {
295 found = hostalias_masq;
298 if ( (!strcasecmp(type, "localhost")) && (!strcasecmp(fqdn, host))) {
299 found = hostalias_localhost;
302 // "directory" used to be a distributed version of "localhost" but they're both the same now
303 if ( (!strcasecmp(type, "directory")) && (!strcasecmp(fqdn, host))) {
304 found = hostalias_localhost;
307 if (found) return(found);
309 return(hostalias_nomatch);
314 * Determine whether a given Internet address belongs to the current user
316 int CtdlIsMe(char *addr, int addr_buf_len) {
317 struct recptypes *recp;
320 recp = validate_recipients(addr, NULL, 0);
321 if (recp == NULL) return(0);
323 if (recp->num_local == 0) {
324 free_recipients(recp);
328 for (i=0; i<recp->num_local; ++i) {
329 extract_token(addr, recp->recp_local, i, '|', addr_buf_len);
330 if (!strcasecmp(addr, CC->user.fullname)) {
331 free_recipients(recp);
336 free_recipients(recp);
341 /* If the last item in a list of recipients was truncated to a partial address,
342 * remove it completely in order to avoid choking library functions.
344 void sanitize_truncated_recipient(char *str)
347 if (num_tokens(str, ',') < 2) return;
349 int len = strlen(str);
350 if (len < 900) return;
351 if (len > 998) str[998] = 0;
353 char *cptr = strrchr(str, ',');
356 char *lptr = strchr(cptr, '<');
357 char *rptr = strchr(cptr, '>');
359 if ( (lptr) && (rptr) && (rptr > lptr) ) return;
366 * This function is self explanatory.
367 * (What can I say, I'm in a weird mood today...)
369 void remove_any_whitespace_to_the_left_or_right_of_at_symbol(char *name) {
373 for (ptr=name; *ptr; ++ptr) {
374 while ( (isspace(*ptr)) && (*(ptr+1)=='@') ) {
376 if (ptr > name) --ptr;
378 while ( (*ptr=='@') && (*(ptr+1)!=0) && (isspace(*(ptr+1))) ) {
379 strcpy(ptr+1, ptr+2);
385 // values that can be returned by expand_aliases()
387 EA_ERROR, // Can't send message due to bad address
388 EA_MULTIPLE, // Alias expanded into multiple recipients -- run me again!
389 EA_LOCAL, // Local message, do no network processing
390 EA_INTERNET // Convert msg and send as Internet mail
394 // Process alias and routing info for email addresses
395 int expand_aliases(char *name, char *aliases) {
401 int num_aliases = num_tokens(aliases, '\n');
402 for (a=0; a<num_aliases; ++a) {
403 extract_token(aaa, aliases, a, '\n', sizeof aaa);
404 char *bar = strchr(aaa, '|');
410 if ( (!IsEmptyStr(aaa)) && (!strcasecmp(name, aaa)) ) {
411 syslog(LOG_DEBUG, "internet_addressing: global alias <%s> to <%s>", name, bar);
416 if (strchr(name, ',')) {
421 char original_name[256]; // Now go for the regular aliases
422 safestrncpy(original_name, name, sizeof original_name);
424 // should these checks still be here, or maybe move them to split_recps() ?
426 remove_any_whitespace_to_the_left_or_right_of_at_symbol(name);
427 stripallbut(name, '<', '>');
429 /* Hit the email address directory */
430 if (CtdlDirectoryLookup(aaa, name, sizeof aaa) == 0) {
434 if (strcasecmp(original_name, name)) {
435 syslog(LOG_INFO, "internet_addressing: directory alias <%s> to <%s>", original_name, name);
438 /* Change "user @ xxx" to "user" if xxx is an alias for this host */
439 for (a=0; name[a] != '\0'; ++a) {
440 if (name[a] == '@') {
441 if (CtdlHostAlias(&name[a+1]) == hostalias_localhost) {
443 syslog(LOG_DEBUG, "internet_addressing: host is local, recipient is <%s>", name);
449 /* Is this a local or remote recipient? */
450 at = haschar(name, '@');
452 return(EA_LOCAL); /* no @'s = local address */
455 return(EA_INTERNET); /* one @ = internet address */
458 return(EA_ERROR); /* more than one @ = badly formed address */
463 // Return a supplied list of email addresses as an array, removing superfluous information and syntax.
464 Array *split_recps(char *addresses) {
466 // Copy the supplied address list into our own memory space, because we are going to mangle it.
467 char *a = malloc(strlen(addresses));
469 syslog(LOG_ERR, "internet_addressing: malloc() failed: %m");
473 // Strip out anything in double quotes
478 for (t=addresses; t[0]; ++t) {
488 // Transform all qualifying delimiters to commas
489 for (t=a; t[0]; ++t) {
490 if ((t[0]==';') || (t[0]=='|')) {
495 // Tokenize the recipients into an array
496 Array *recipients_array = array_new(256); // no single recipient should be bigger than 256 bytes
498 int num_addresses = num_tokens(a, ',');
499 for (int i=0; i<num_addresses; ++i) {
500 char this_address[256];
501 extract_token(this_address, a, i, ',', sizeof this_address);
502 striplt(this_address); // strip leading and trailing whitespace
503 stripout(this_address, '(', ')'); // remove any portion in parentheses
504 stripallbut(this_address, '<', '>'); // if angle brackets are present, keep only what is inside them
505 if (!IsEmptyStr(this_address)) {
506 array_append(recipients_array, this_address);
510 free(a); // We don't need this buffer anymore.
511 return(recipients_array); // Return the completed array to the caller.
515 // Validate recipients, count delivery types and errors, and handle aliasing
516 // FIXME check for dupes!!!!!
518 // Returns 0 if all addresses are ok, ret->num_error = -1 if no addresses
519 // were specified, or the number of addresses found invalid.
521 // Caller needs to free the result using free_recipients()
523 struct recptypes *validate_recipients(char *supplied_recipients, const char *RemoteIdentifier, int Flags) {
524 struct recptypes *ret;
525 char *recipients = NULL;
530 struct ctdluser tempUS;
531 struct ctdlroom original_room;
537 ret = (struct recptypes *) malloc(sizeof(struct recptypes)); // Initialize
538 if (ret == NULL) return(NULL);
539 memset(ret, 0, sizeof(struct recptypes)); // set all values to null/zero
541 if (supplied_recipients == NULL) {
542 recipients = strdup("");
545 recipients = strdup(supplied_recipients);
548 len = strlen(recipients) + 1024; // allocate memory
549 ret->errormsg = malloc(len);
550 ret->recp_local = malloc(len);
551 ret->recp_internet = malloc(len);
552 ret->recp_room = malloc(len);
553 ret->display_recp = malloc(len);
554 ret->recp_orgroom = malloc(len);
556 ret->errormsg[0] = 0;
557 ret->recp_local[0] = 0;
558 ret->recp_internet[0] = 0;
559 ret->recp_room[0] = 0;
560 ret->recp_orgroom[0] = 0;
561 ret->display_recp[0] = 0;
562 ret->recptypes_magic = RECPTYPES_MAGIC;
564 // char *aliases = CtdlGetSysConfig(GLOBAL_ALIASES); // First hit the Global Alias Table
565 // char *aliases = strdup("root|admin,ajc@citadel.org,artcancro@gmail.com\n abuse|admin\n ajc|ajc@citadel.org\n");//crashes
566 // char *aliases = strdup("root|admin,eeeeee@example.com\nabuse|admin\neek|blat\nwoiwozerosf|wow\n"); //works
567 // char *aliases = strdup("root|admin,ajc@citadel.org"); // works
568 // char *aliases = strdup("root|admin,eeeeee@example.com"); // works
569 // char *aliases = strdup("root|admin,eeeeeee@example.com"); // crashes
570 char *aliases = strdup("root|admin,ignatius.t.foobar@uncensored.citadel.org"); // crashes on the first try
572 Array *recp_array = split_recps(supplied_recipients);
573 int original_array_len = array_len(recp_array);
574 for (int r=0; r<array_len(recp_array); ++r) {
575 org_recp = (char *)array_get_element_at(recp_array, r);
576 strncpy(this_recp, org_recp, sizeof this_recp);
577 mailtype = expand_aliases(this_recp, aliases);
579 // If an alias expanded to multiple recipients, strip off those recipients and append them
580 // to the end of the array. This loop will hit those again when it gets there.
581 // Note that we don't do this after we get past the *original* array length, to avoid aliasing loops.
582 if (mailtype == EA_MULTIPLE) {
583 if (r < original_array_len) {
585 while ((comma = strrchr(this_recp, ','))) {
587 array_append(recp_array, &comma[1]);
588 strcpy(org_recp, this_recp);
596 syslog(LOG_DEBUG, "\x1b[7m%s\x1b[0m", this_recp);
598 mailtype = expand_aliases(this_recp, aliases); // do it ONCE again to handle alias expansions
599 if (mailtype == EA_MULTIPLE) {
600 mailtype = EA_ERROR; // and fail if it wants to expand a second time
606 case EA_LOCAL: // There are several types of "local" recipients.
608 // Old BBS conventions require mail to "sysop" to go somewhere. Send it to the admin room.
609 if (!strcasecmp(this_recp, "sysop")) {
611 strcpy(this_recp, CtdlGetConfigStr("c_aideroom"));
612 if (!IsEmptyStr(ret->recp_room)) {
613 strcat(ret->recp_room, "|");
615 strcat(ret->recp_room, this_recp);
618 // This handles rooms which can receive posts via email.
619 else if (!strncasecmp(this_recp, "room_", 5)) {
620 original_room = CC->room; // Remember where we parked
622 char mail_to_room[ROOMNAMELEN];
624 strncpy(mail_to_room, &this_recp[5], sizeof mail_to_room);
625 for (m = mail_to_room; *m; ++m) {
626 if (m[0] == '_') m[0]=' ';
628 if (!CtdlGetRoom(&CC->room, mail_to_room)) { // Find the room they asked for
630 err = CtdlDoIHavePermissionToPostInThisRoom( // check for write permissions to room
635 0 // 0 means "this is not a reply"
643 if (!IsEmptyStr(ret->recp_room)) {
644 strcat(ret->recp_room, "|");
646 strcat(ret->recp_room, &this_recp[5]);
648 if (!IsEmptyStr(ret->recp_orgroom)) {
649 strcat(ret->recp_orgroom, "|");
651 strcat(ret->recp_orgroom, org_recp);
655 else { // no such room exists
660 // Restore this session's original room location.
661 CC->room = original_room;
665 // This handles the most common case, which is mail to a user's inbox.
666 else if (CtdlGetUser(&tempUS, this_recp) == 0) {
668 strcpy(this_recp, tempUS.fullname);
669 if (!IsEmptyStr(ret->recp_local)) {
670 strcat(ret->recp_local, "|");
672 strcat(ret->recp_local, this_recp);
675 // No match for this recipient
682 // Yes, you're reading this correctly: if the target domain points back to the local system,
683 // the address is invalid. That's because if the address were valid, we would have
684 // already translated it to a local address by now.
685 if (IsDirectory(this_recp, 0)) {
691 if (!IsEmptyStr(ret->recp_internet)) {
692 strcat(ret->recp_internet, "|");
694 strcat(ret->recp_internet, this_recp);
703 if (IsEmptyStr(errmsg)) {
704 snprintf(append, sizeof append, "Invalid recipient: %s", this_recp);
707 snprintf(append, sizeof append, "%s", errmsg);
709 if ( (strlen(ret->errormsg) + strlen(append) + 3) < SIZ) {
710 if (!IsEmptyStr(ret->errormsg)) {
711 strcat(ret->errormsg, "; ");
713 strcat(ret->errormsg, append);
717 if (IsEmptyStr(ret->display_recp)) {
718 strcpy(append, this_recp);
721 snprintf(append, sizeof append, ", %s", this_recp);
723 if ( (strlen(ret->display_recp)+strlen(append)) < SIZ) {
724 strcat(ret->display_recp, append);
729 if (aliases != NULL) { // ok, we're done with the global alias list now
733 if ( (ret->num_local + ret->num_internet + ret->num_room + ret->num_error) == 0) {
734 ret->num_error = (-1);
735 strcpy(ret->errormsg, "No recipients specified.");
738 syslog(LOG_DEBUG, "internet_addressing: validate_recipients() = %d local, %d room, %d SMTP, %d error",
739 ret->num_local, ret->num_room, ret->num_internet, ret->num_error
743 array_free(recp_array);
750 * Destructor for recptypes
752 void free_recipients(struct recptypes *valid) {
758 if (valid->recptypes_magic != RECPTYPES_MAGIC) {
759 syslog(LOG_ERR, "internet_addressing: attempt to call free_recipients() on some other data type!");
763 if (valid->errormsg != NULL) free(valid->errormsg);
764 if (valid->recp_local != NULL) free(valid->recp_local);
765 if (valid->recp_internet != NULL) free(valid->recp_internet);
766 if (valid->recp_room != NULL) free(valid->recp_room);
767 if (valid->recp_orgroom != NULL) free(valid->recp_orgroom);
768 if (valid->display_recp != NULL) free(valid->display_recp);
769 if (valid->bounce_to != NULL) free(valid->bounce_to);
770 if (valid->envelope_from != NULL) free(valid->envelope_from);
771 if (valid->sending_room != NULL) free(valid->sending_room);
776 char *qp_encode_email_addrs(char *source) {
777 char *user, *node, *name;
778 const char headerStr[] = "=?UTF-8?Q?";
782 int need_to_encode = 0;
788 long nAddrPtrMax = 50;
793 if (source == NULL) return source;
794 if (IsEmptyStr(source)) return source;
795 syslog(LOG_DEBUG, "internet_addressing: qp_encode_email_addrs <%s>", source);
797 AddrPtr = malloc (sizeof (long) * nAddrPtrMax);
798 AddrUtf8 = malloc (sizeof (long) * nAddrPtrMax);
799 memset(AddrUtf8, 0, sizeof (long) * nAddrPtrMax);
802 while (!IsEmptyStr (&source[i])) {
803 if (nColons >= nAddrPtrMax){
806 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
807 memcpy (ptr, AddrPtr, sizeof (long) * nAddrPtrMax);
808 free (AddrPtr), AddrPtr = ptr;
810 ptr = (long *) malloc(sizeof (long) * nAddrPtrMax * 2);
811 memset(&ptr[nAddrPtrMax], 0, sizeof (long) * nAddrPtrMax);
813 memcpy (ptr, AddrUtf8, sizeof (long) * nAddrPtrMax);
814 free (AddrUtf8), AddrUtf8 = ptr;
817 if (((unsigned char) source[i] < 32) || ((unsigned char) source[i] > 126)) {
819 AddrUtf8[nColons] = 1;
821 if (source[i] == '"') {
822 InQuotes = !InQuotes;
824 if (!InQuotes && source[i] == ',') {
825 AddrPtr[nColons] = i;
830 if (need_to_encode == 0) {
837 EncodedMaxLen = nColons * (sizeof(headerStr) + 3) + SourceLen * 3;
838 Encoded = (char*) malloc (EncodedMaxLen);
840 for (i = 0; i < nColons; i++) {
841 source[AddrPtr[i]++] = '\0';
843 /* TODO: if libidn, this might get larger*/
844 user = malloc(SourceLen + 1);
845 node = malloc(SourceLen + 1);
846 name = malloc(SourceLen + 1);
850 for (i = 0; i < nColons && nPtr != NULL; i++) {
851 nmax = EncodedMaxLen - (nPtr - Encoded);
853 process_rfc822_addr(&source[AddrPtr[i]], user, node, name);
854 /* TODO: libIDN here ! */
855 if (IsEmptyStr(name)) {
856 n = snprintf(nPtr, nmax, (i==0)?"%s@%s" : ",%s@%s", user, node);
859 EncodedName = rfc2047encode(name, strlen(name));
860 n = snprintf(nPtr, nmax, (i==0)?"%s <%s@%s>" : ",%s <%s@%s>", EncodedName, user, node);
865 n = snprintf(nPtr, nmax, (i==0)?"%s" : ",%s", &source[AddrPtr[i]]);
871 ptr = (char*) malloc(EncodedMaxLen * 2);
872 memcpy(ptr, Encoded, EncodedMaxLen);
873 nnPtr = ptr + (nPtr - Encoded), nPtr = nnPtr;
874 free(Encoded), Encoded = ptr;
876 i--; /* do it once more with properly lengthened buffer */
879 for (i = 0; i < nColons; i++)
880 source[--AddrPtr[i]] = ',';
892 * Unfold a multi-line field into a single line, removing multi-whitespaces
894 void unfold_rfc822_field(char **field, char **FieldEnd)
897 char *pField = *field;
899 char *pFieldEnd = *FieldEnd;
901 while (isspace(*pField))
903 /* remove leading/trailing whitespace */
906 while (isspace(*pFieldEnd))
909 *FieldEnd = pFieldEnd;
910 /* convert non-space whitespace to spaces, and remove double blanks */
911 for (sField = *field = pField;
915 if ((*sField=='\r') || (*sField=='\n'))
918 while ( ( (*(sField + offset) == '\r') || (*(sField + offset) == '\n' )) && (sField + offset < pFieldEnd) ) {
925 if (*sField=='\"') quote = 1 - quote;
927 if (isspace(*sField)) {
932 while ((sField < pFieldEnd) &&
937 else *pField = *sField;
939 else *pField = *sField;
943 *FieldEnd = pField - 1;
948 * Split an RFC822-style address into userid, host, and full name
951 void process_rfc822_addr(const char *rfc822, char *user, char *node, char *name) {
955 strcpy(node, CtdlGetConfigStr("c_fqdn"));
958 if (rfc822 == NULL) return;
960 /* extract full name - first, it's From minus <userid> */
961 strcpy(name, rfc822);
962 stripout(name, '<', '>');
964 /* strip anything to the left of a bang */
965 while ((!IsEmptyStr(name)) && (haschar(name, '!') > 0))
966 strcpy(name, &name[1]);
968 /* and anything to the right of a @ or % */
969 for (a = 0; name[a] != '\0'; ++a) {
970 if (name[a] == '@') {
974 if (name[a] == '%') {
980 /* but if there are parentheses, that changes the rules... */
981 if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
982 strcpy(name, rfc822);
983 stripallbut(name, '(', ')');
986 /* but if there are a set of quotes, that supersedes everything */
987 if (haschar(rfc822, 34) == 2) {
988 strcpy(name, rfc822);
989 while ((!IsEmptyStr(name)) && (name[0] != 34)) {
990 strcpy(&name[0], &name[1]);
992 strcpy(&name[0], &name[1]);
993 for (a = 0; name[a] != '\0'; ++a)
999 /* extract user id */
1000 strcpy(user, rfc822);
1002 /* first get rid of anything in parens */
1003 stripout(user, '(', ')');
1005 /* if there's a set of angle brackets, strip it down to that */
1006 if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
1007 stripallbut(user, '<', '>');
1010 /* strip anything to the left of a bang */
1011 while ((!IsEmptyStr(user)) && (haschar(user, '!') > 0))
1012 strcpy(user, &user[1]);
1014 /* and anything to the right of a @ or % */
1015 for (a = 0; user[a] != '\0'; ++a) {
1016 if (user[a] == '@') {
1020 if (user[a] == '%') {
1027 /* extract node name */
1028 strcpy(node, rfc822);
1030 /* first get rid of anything in parens */
1031 stripout(node, '(', ')');
1033 /* if there's a set of angle brackets, strip it down to that */
1034 if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
1035 stripallbut(node, '<', '>');
1038 /* If no node specified, tack ours on instead */
1040 (haschar(node, '@')==0)
1041 && (haschar(node, '%')==0)
1042 && (haschar(node, '!')==0)
1044 strcpy(node, CtdlGetConfigStr("c_nodename"));
1048 /* strip anything to the left of a @ */
1049 while ((!IsEmptyStr(node)) && (haschar(node, '@') > 0))
1050 strcpy(node, &node[1]);
1052 /* strip anything to the left of a % */
1053 while ((!IsEmptyStr(node)) && (haschar(node, '%') > 0))
1054 strcpy(node, &node[1]);
1056 /* reduce multiple system bang paths to node!user */
1057 while ((!IsEmptyStr(node)) && (haschar(node, '!') > 1))
1058 strcpy(node, &node[1]);
1060 /* now get rid of the user portion of a node!user string */
1061 for (a = 0; node[a] != '\0'; ++a)
1062 if (node[a] == '!') {
1068 /* strip leading and trailing spaces in all strings */
1073 /* If we processed a string that had the address in angle brackets
1074 * but no name outside the brackets, we now have an empty name. In
1075 * this case, use the user portion of the address as the name.
1077 if ((IsEmptyStr(name)) && (!IsEmptyStr(user))) {
1084 * convert_field() is a helper function for convert_internet_message().
1085 * Given start/end positions for an rfc822 field, it converts it to a Citadel
1086 * field if it wants to, and unfolds it if necessary.
1088 * Returns 1 if the field was converted and inserted into the Citadel message
1089 * structure, implying that the source field should be removed from the
1092 int convert_field(struct CtdlMessage *msg, const char *beg, const char *end) {
1093 char *key, *value, *valueend;
1097 const char *colonpos = NULL;
1106 for (pos = end; pos >= beg; pos--) {
1107 if (*pos == ':') colonpos = pos;
1110 if (colonpos == NULL) return(0); /* no colon? not a valid header line */
1113 key = malloc(len + 2);
1114 memcpy(key, beg, len + 1);
1116 valueend = key + len;
1117 * ( key + (colonpos - beg) ) = '\0';
1118 value = &key[(colonpos - beg) + 1];
1119 /* printf("Header: [%s]\nValue: [%s]\n", key, value); */
1120 unfold_rfc822_field(&value, &valueend);
1121 valuelen = valueend - value + 1;
1122 /* printf("UnfoldedValue: [%s]\n", value); */
1125 * Here's the big rfc822-to-citadel loop.
1128 /* Date/time is converted into a unix timestamp. If the conversion
1129 * fails, we replace it with the time the message arrived locally.
1131 if (!strcasecmp(key, "Date")) {
1132 parsed_date = parsedate(value);
1133 if (parsed_date < 0L) parsed_date = time(NULL);
1135 if (CM_IsEmpty(msg, eTimestamp))
1136 CM_SetFieldLONG(msg, eTimestamp, parsed_date);
1140 else if (!strcasecmp(key, "From")) {
1141 process_rfc822_addr(value, user, node, name);
1142 syslog(LOG_DEBUG, "internet_addressing: converted to <%s@%s> (%s)", user, node, name);
1143 snprintf(addr, sizeof(addr), "%s@%s", user, node);
1144 if (CM_IsEmpty(msg, eAuthor) && !IsEmptyStr(name)) {
1145 CM_SetField(msg, eAuthor, name, -1);
1147 if (CM_IsEmpty(msg, erFc822Addr) && !IsEmptyStr(addr)) {
1148 CM_SetField(msg, erFc822Addr, addr, -1);
1153 else if (!strcasecmp(key, "Subject")) {
1154 if (CM_IsEmpty(msg, eMsgSubject))
1155 CM_SetField(msg, eMsgSubject, value, valuelen);
1159 else if (!strcasecmp(key, "List-ID")) {
1160 if (CM_IsEmpty(msg, eListID))
1161 CM_SetField(msg, eListID, value, valuelen);
1165 else if (!strcasecmp(key, "To")) {
1166 if (CM_IsEmpty(msg, eRecipient))
1167 CM_SetField(msg, eRecipient, value, valuelen);
1171 else if (!strcasecmp(key, "CC")) {
1172 if (CM_IsEmpty(msg, eCarbonCopY))
1173 CM_SetField(msg, eCarbonCopY, value, valuelen);
1177 else if (!strcasecmp(key, "Message-ID")) {
1178 if (!CM_IsEmpty(msg, emessageId)) {
1179 syslog(LOG_WARNING, "internet_addressing: duplicate message id");
1186 pValueLen = valuelen;
1187 /* Strip angle brackets */
1188 while (haschar(pValue, '<') > 0) {
1193 for (i = 0; i <= pValueLen; ++i)
1194 if (pValue[i] == '>') {
1199 CM_SetField(msg, emessageId, pValue, pValueLen);
1205 else if (!strcasecmp(key, "Return-Path")) {
1206 if (CM_IsEmpty(msg, eMessagePath))
1207 CM_SetField(msg, eMessagePath, value, valuelen);
1211 else if (!strcasecmp(key, "Envelope-To")) {
1212 if (CM_IsEmpty(msg, eenVelopeTo))
1213 CM_SetField(msg, eenVelopeTo, value, valuelen);
1217 else if (!strcasecmp(key, "References")) {
1218 CM_SetField(msg, eWeferences, value, valuelen);
1222 else if (!strcasecmp(key, "Reply-To")) {
1223 CM_SetField(msg, eReplyTo, value, valuelen);
1227 else if (!strcasecmp(key, "In-reply-to")) {
1228 if (CM_IsEmpty(msg, eWeferences)) /* References: supersedes In-reply-to: */
1229 CM_SetField(msg, eWeferences, value, valuelen);
1235 /* Clean up and move on. */
1236 free(key); /* Don't free 'value', it's actually the same buffer */
1242 * Convert RFC822 references format (References) to Citadel references format (Weferences)
1244 void convert_references_to_wefewences(char *str) {
1245 int bracket_nesting = 0;
1247 char *moveptr = NULL;
1254 if (bracket_nesting < 0) bracket_nesting = 0;
1256 if ((ch == '>') && (bracket_nesting == 0) && (*(ptr+1)) && (ptr>str) ) {
1260 else if (bracket_nesting > 0) {
1266 *moveptr = *(moveptr+1);
1270 if (ch == '<') ++bracket_nesting;
1277 * Convert an RFC822 message (headers + body) to a CtdlMessage structure.
1278 * NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
1279 * will be deallocated when CM_Free() is called. Therefore, the
1280 * supplied buffer should be DEREFERENCED. It should not be freed or used
1283 struct CtdlMessage *convert_internet_message(char *rfc822) {
1284 StrBuf *RFCBuf = NewStrBufPlain(rfc822, -1);
1286 return convert_internet_message_buf(&RFCBuf);
1290 struct CtdlMessage *convert_internet_message_buf(StrBuf **rfc822)
1292 struct CtdlMessage *msg;
1293 const char *pos, *beg, *end, *totalend;
1294 int done, alldone = 0;
1296 StrBuf *OtherHeaders;
1298 msg = malloc(sizeof(struct CtdlMessage));
1299 if (msg == NULL) return msg;
1301 memset(msg, 0, sizeof(struct CtdlMessage));
1302 msg->cm_magic = CTDLMESSAGE_MAGIC; /* self check */
1303 msg->cm_anon_type = 0; /* never anonymous */
1304 msg->cm_format_type = FMT_RFC822; /* internet message */
1306 pos = ChrPtr(*rfc822);
1307 totalend = pos + StrLength(*rfc822);
1309 OtherHeaders = NewStrBufPlain(NULL, StrLength(*rfc822));
1313 /* Locate beginning and end of field, keeping in mind that
1314 * some fields might be multiline
1318 while ((end < totalend) &&
1323 if ( (*pos=='\n') && ((*(pos+1))!=0x20) && ((*(pos+1))!=0x09) )
1328 /* done with headers? */
1330 ( (*(pos+1)=='\n') ||
1336 if (pos >= (totalend - 1) )
1346 /* At this point we have a field. Are we interested in it? */
1347 converted = convert_field(msg, beg, end);
1349 /* Strip the field out of the RFC822 header if we used it */
1351 StrBufAppendBufPlain(OtherHeaders, beg, end - beg, 0);
1352 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1355 /* If we've hit the end of the message, bail out */
1356 if (pos >= totalend)
1359 StrBufAppendBufPlain(OtherHeaders, HKEY("\n"), 0);
1361 StrBufAppendBufPlain(OtherHeaders, pos, totalend - pos, 0);
1363 CM_SetAsFieldSB(msg, eMesageText, &OtherHeaders);
1365 /* Follow-up sanity checks... */
1367 /* If there's no timestamp on this message, set it to now. */
1368 if (CM_IsEmpty(msg, eTimestamp)) {
1369 CM_SetFieldLONG(msg, eTimestamp, time(NULL));
1372 /* If a W (references, or rather, Wefewences) field is present, we
1373 * have to convert it from RFC822 format to Citadel format.
1375 if (!CM_IsEmpty(msg, eWeferences)) {
1377 convert_references_to_wefewences(msg->cm_fields[eWeferences]);
1385 * Look for a particular header field in an RFC822 message text. If the
1386 * requested field is found, it is unfolded (if necessary) and returned to
1387 * the caller. The field name is stripped out, leaving only its contents.
1388 * The caller is responsible for freeing the returned buffer. If the requested
1389 * field is not present, or anything else goes wrong, it returns NULL.
1391 char *rfc822_fetch_field(const char *rfc822, const char *fieldname) {
1392 char *fieldbuf = NULL;
1393 const char *end_of_headers;
1394 const char *field_start;
1399 /* Should never happen, but sometimes we get stupid */
1400 if (rfc822 == NULL) return(NULL);
1401 if (fieldname == NULL) return(NULL);
1403 snprintf(fieldhdr, sizeof fieldhdr, "%s:", fieldname);
1405 /* Locate the end of the headers, so we don't run past that point */
1406 end_of_headers = cbmstrcasestr(rfc822, "\n\r\n");
1407 if (end_of_headers == NULL) {
1408 end_of_headers = cbmstrcasestr(rfc822, "\n\n");
1410 if (end_of_headers == NULL) return (NULL);
1412 field_start = cbmstrcasestr(rfc822, fieldhdr);
1413 if (field_start == NULL) return(NULL);
1414 if (field_start > end_of_headers) return(NULL);
1416 fieldbuf = malloc(SIZ);
1417 strcpy(fieldbuf, "");
1420 ptr = cmemreadline(ptr, fieldbuf, SIZ-strlen(fieldbuf) );
1421 while ( (isspace(ptr[0])) && (ptr < end_of_headers) ) {
1422 strcat(fieldbuf, " ");
1423 cont = &fieldbuf[strlen(fieldbuf)];
1424 ptr = cmemreadline(ptr, cont, SIZ-strlen(fieldbuf) );
1428 strcpy(fieldbuf, &fieldbuf[strlen(fieldhdr)]);
1435 /*****************************************************************************
1436 * DIRECTORY MANAGEMENT FUNCTIONS *
1437 *****************************************************************************/
1440 * Generate the index key for an Internet e-mail address to be looked up
1443 void directory_key(char *key, char *addr) {
1447 for (i=0; !IsEmptyStr(&addr[i]); ++i) {
1448 if (!isspace(addr[i])) {
1449 key[keylen++] = tolower(addr[i]);
1454 syslog(LOG_DEBUG, "internet_addressing: directory key is <%s>", key);
1459 * Return nonzero if the supplied address is in one of "our" domains
1461 int IsDirectory(char *addr, int allow_masq_domains) {
1465 extract_token(domain, addr, 1, '@', sizeof domain);
1468 h = CtdlHostAlias(domain);
1470 if ( (h == hostalias_masq) && allow_masq_domains)
1473 if (h == hostalias_localhost) {
1483 * Add an Internet e-mail address to the directory for a user
1485 int CtdlDirectoryAddUser(char *internet_addr, char *citadel_addr) {
1488 if (IsDirectory(internet_addr, 0) == 0) {
1491 syslog(LOG_DEBUG, "internet_addressing: create directory entry: %s --> %s", internet_addr, citadel_addr);
1492 directory_key(key, internet_addr);
1493 cdb_store(CDB_DIRECTORY, key, strlen(key), citadel_addr, strlen(citadel_addr)+1 );
1499 * Delete an Internet e-mail address from the directory.
1501 * (NOTE: we don't actually use or need the citadel_addr variable; it's merely
1502 * here because the callback API expects to be able to send it.)
1504 int CtdlDirectoryDelUser(char *internet_addr, char *citadel_addr) {
1507 syslog(LOG_DEBUG, "internet_addressing: delete directory entry: %s --> %s", internet_addr, citadel_addr);
1508 directory_key(key, internet_addr);
1509 return cdb_delete(CDB_DIRECTORY, key, strlen(key) ) == 0;
1514 * Look up an Internet e-mail address in the directory.
1515 * On success: returns 0, and Citadel address stored in 'target'
1516 * On failure: returns nonzero
1518 int CtdlDirectoryLookup(char *target, char *internet_addr, size_t targbuflen) {
1519 struct cdbdata *cdbrec;
1522 /* Dump it in there unchanged, just for kicks */
1523 if (target != NULL) {
1524 safestrncpy(target, internet_addr, targbuflen);
1527 /* Only do lookups for addresses with hostnames in them */
1528 if (num_tokens(internet_addr, '@') != 2) return(-1);
1530 /* Only do lookups for domains in the directory */
1531 if (IsDirectory(internet_addr, 0) == 0) return(-1);
1533 directory_key(key, internet_addr);
1534 cdbrec = cdb_fetch(CDB_DIRECTORY, key, strlen(key) );
1535 if (cdbrec != NULL) {
1536 if (target != NULL) {
1537 safestrncpy(target, cdbrec->ptr, targbuflen);
1548 * Harvest any email addresses that someone might want to have in their
1549 * "collected addresses" book.
1551 char *harvest_collected_addresses(struct CtdlMessage *msg) {
1554 char user[256], node[256], name[256];
1557 eMsgField field = 0;
1559 if (msg == NULL) return(NULL);
1563 if (!CM_IsEmpty(msg, eAuthor)) {
1564 strcat(addr, msg->cm_fields[eAuthor]);
1566 if (!CM_IsEmpty(msg, erFc822Addr)) {
1568 strcat(addr, msg->cm_fields[erFc822Addr]);
1570 if (IsDirectory(msg->cm_fields[erFc822Addr], 0)) {
1575 if (is_harvestable) {
1576 coll = strdup(addr);
1582 if (coll == NULL) return(NULL);
1584 /* Scan both the R (To) and Y (CC) fields */
1585 for (i = 0; i < 2; ++i) {
1586 if (i == 0) field = eRecipient;
1587 if (i == 1) field = eCarbonCopY;
1589 if (!CM_IsEmpty(msg, field)) {
1590 for (j=0; j<num_tokens(msg->cm_fields[field], ','); ++j) {
1591 extract_token(addr, msg->cm_fields[field], j, ',', sizeof addr);
1592 if (strstr(addr, "=?") != NULL)
1593 utf8ify_rfc822_string(addr);
1594 process_rfc822_addr(addr, user, node, name);
1595 h = CtdlHostAlias(node);
1596 if (h != hostalias_localhost) {
1597 coll = realloc(coll, strlen(coll) + strlen(addr) + 4);
1598 if (coll == NULL) return(NULL);
1599 if (!IsEmptyStr(coll)) {
1609 if (IsEmptyStr(coll)) {
1618 * Helper function for CtdlRebuildDirectoryIndex()
1620 void CtdlRebuildDirectoryIndex_backend(char *username, void *data) {
1623 struct ctdluser usbuf;
1625 if (CtdlGetUser(&usbuf, username) != 0) {
1629 if ( (!IsEmptyStr(usbuf.fullname)) && (!IsEmptyStr(usbuf.emailaddrs)) ) {
1630 for (j=0; j<num_tokens(usbuf.emailaddrs, '|'); ++j) {
1631 char one_email[512];
1632 extract_token(one_email, usbuf.emailaddrs, j, '|', sizeof one_email);
1633 CtdlDirectoryAddUser(one_email, usbuf.fullname);
1640 * Initialize the directory database (erasing anything already there)
1642 void CtdlRebuildDirectoryIndex(void) {
1643 syslog(LOG_INFO, "internet_addressing: rebuilding email address directory index");
1644 cdb_trunc(CDB_DIRECTORY);
1645 ForEachUser(CtdlRebuildDirectoryIndex_backend, NULL);
1650 * Configure Internet email addresses for a user account, updating the Directory Index in the process
1652 void CtdlSetEmailAddressesForUser(char *requested_user, char *new_emailaddrs)
1654 struct ctdluser usbuf;
1658 if (CtdlGetUserLock(&usbuf, requested_user) != 0) { // We are relying on the fact that the DirectoryIndex functions don't lock.
1659 return; // Silently fail here if we can't acquire a lock on the user record.
1662 syslog(LOG_DEBUG, "internet_addressing: setting email addresses for <%s> to <%s>", usbuf.fullname, new_emailaddrs);
1664 /* Delete all of the existing directory index records for the user (easier this way) */
1665 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1666 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1667 CtdlDirectoryDelUser(buf, requested_user);
1670 strcpy(usbuf.emailaddrs, new_emailaddrs); // make it official.
1672 /* Index all of the new email addresses (they've already been sanitized) */
1673 for (i=0; i<num_tokens(usbuf.emailaddrs, '|'); ++i) {
1674 extract_token(buf, usbuf.emailaddrs, i, '|', sizeof buf);
1675 CtdlDirectoryAddUser(buf, requested_user);
1678 CtdlPutUserLock(&usbuf);
1683 * Auto-generate an Internet email address for a user account
1685 void AutoGenerateEmailAddressForUser(struct ctdluser *user)
1687 char synthetic_email_addr[1024];
1691 for (i=0; u==0; ++i) {
1693 // first try just converting the user name to lowercase and replacing spaces with underscores
1694 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "%s@%s", user->fullname, CtdlGetConfigStr("c_fqdn"));
1695 for (j=0; ((synthetic_email_addr[j] != '\0')&&(synthetic_email_addr[j] != '@')); j++) {
1696 synthetic_email_addr[j] = tolower(synthetic_email_addr[j]);
1697 if (!isalnum(synthetic_email_addr[j])) {
1698 synthetic_email_addr[j] = '_';
1703 // then try 'ctdl' followed by the user number
1704 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08lx@%s", user->usernum, CtdlGetConfigStr("c_fqdn"));
1707 // oof. just keep trying other numbers until we find one
1708 snprintf(synthetic_email_addr, sizeof synthetic_email_addr, "ctdl%08x@%s", i, CtdlGetConfigStr("c_fqdn"));
1710 u = CtdlDirectoryLookup(NULL, synthetic_email_addr, 0);
1711 syslog(LOG_DEBUG, "user_ops: address <%s> lookup returned <%d>", synthetic_email_addr, u);
1714 CtdlSetEmailAddressesForUser(user->fullname, synthetic_email_addr);
1715 strncpy(CC->user.emailaddrs, synthetic_email_addr, sizeof(user->emailaddrs));
1716 syslog(LOG_DEBUG, "user_ops: auto-generated email address <%s> for <%s>", synthetic_email_addr, user->fullname);