4 * This file contains functions which handle the mapping of Internet addresses
5 * to users on the Citadel system.
17 #include <sys/types.h>
19 #if TIME_WITH_SYS_TIME
20 # include <sys/time.h>
24 # include <sys/time.h>
35 #include "sysdep_decls.h"
36 #include "citserver.h"
41 #include "internet_addressing.h"
44 #include "parsedate.h"
57 * Return nonzero if the supplied name is an alias for this host.
59 int CtdlHostAlias(char *fqdn) {
63 char host[SIZ], type[SIZ];
65 if (!strcasecmp(fqdn, config.c_fqdn)) return(hostalias_localhost);
66 if (!strcasecmp(fqdn, config.c_nodename)) return(hostalias_localhost);
67 if (inetcfg == NULL) return(hostalias_nomatch);
69 config_lines = num_tokens(inetcfg, '\n');
70 for (i=0; i<config_lines; ++i) {
71 extract_token(buf, inetcfg, i, '\n');
72 extract_token(host, buf, 0, '|');
73 extract_token(type, buf, 1, '|');
75 if ( (!strcasecmp(type, "localhost"))
76 && (!strcasecmp(fqdn, host)))
77 return(hostalias_localhost);
79 if ( (!strcasecmp(type, "gatewaydomain"))
80 && (!strcasecmp(&fqdn[strlen(fqdn)-strlen(host)], host)))
81 return(hostalias_gatewaydomain);
85 return(hostalias_nomatch);
95 * Return 0 if a given string fuzzy-matches a Citadel user account
97 * FIXME ... this needs to be updated to handle aliases.
99 int fuzzy_match(struct usersupp *us, char *matchstring) {
102 if ( (!strncasecmp(matchstring, "cit", 3))
103 && (atol(&matchstring[3]) == us->usernum)) {
108 for (a=0; a<strlen(us->fullname); ++a) {
109 if (!strncasecmp(&us->fullname[a],
110 matchstring, strlen(matchstring))) {
119 * Unfold a multi-line field into a single line, removing multi-whitespaces
121 void unfold_rfc822_field(char *field) {
125 striplt(field); /* remove leading/trailing whitespace */
127 /* convert non-space whitespace to spaces, and remove double blanks */
128 for (i=0; i<strlen(field); ++i) {
129 if (field[i]=='\"') quote = 1 - quote;
131 if (isspace(field[i])) field[i] = ' ';
132 while (isspace(field[i]) && isspace(field[i+1])) {
133 strcpy(&field[i+1], &field[i+2]);
142 * Split an RFC822-style address into userid, host, and full name
145 void process_rfc822_addr(char *rfc822, char *user, char *node, char *name)
150 strcpy(node, config.c_fqdn);
153 /* extract full name - first, it's From minus <userid> */
154 strcpy(name, rfc822);
155 for (a = 0; a < strlen(name); ++a) {
156 if (name[a] == '<') {
158 strcpy(&name[a], &name[a + 1]);
159 } while ((strlen(name) > 0) && (name[a] != '>'));
160 strcpy(&name[a], &name[a + 1]);
163 /* strip anything to the left of a bang */
164 while ((strlen(name) > 0) && (haschar(name, '!') > 0))
165 strcpy(name, &name[1]);
167 /* and anything to the right of a @ or % */
168 for (a = 0; a < strlen(name); ++a) {
175 /* but if there are parentheses, that changes the rules... */
176 if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
177 strcpy(name, rfc822);
178 while ((strlen(name) > 0) && (name[0] != '(')) {
179 strcpy(&name[0], &name[1]);
181 strcpy(&name[0], &name[1]);
182 for (a = 0; a < strlen(name); ++a) {
183 if (name[a] == ')') {
188 /* but if there are a set of quotes, that supersedes everything */
189 if (haschar(rfc822, 34) == 2) {
190 strcpy(name, rfc822);
191 while ((strlen(name) > 0) && (name[0] != 34)) {
192 strcpy(&name[0], &name[1]);
194 strcpy(&name[0], &name[1]);
195 for (a = 0; a < strlen(name); ++a)
199 /* extract user id */
200 strcpy(user, rfc822);
202 /* first get rid of anything in parens */
203 for (a = 0; a < strlen(user); ++a)
204 if (user[a] == '(') {
206 strcpy(&user[a], &user[a + 1]);
207 } while ((strlen(user) > 0) && (user[a] != ')'));
208 strcpy(&user[a], &user[a + 1]);
210 /* if there's a set of angle brackets, strip it down to that */
211 if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
212 while ((strlen(user) > 0) && (user[0] != '<')) {
213 strcpy(&user[0], &user[1]);
215 strcpy(&user[0], &user[1]);
216 for (a = 0; a < strlen(user); ++a)
220 /* strip anything to the left of a bang */
221 while ((strlen(user) > 0) && (haschar(user, '!') > 0))
222 strcpy(user, &user[1]);
224 /* and anything to the right of a @ or % */
225 for (a = 0; a < strlen(user); ++a) {
233 /* extract node name */
234 strcpy(node, rfc822);
236 /* first get rid of anything in parens */
237 for (a = 0; a < strlen(node); ++a)
238 if (node[a] == '(') {
240 strcpy(&node[a], &node[a + 1]);
241 } while ((strlen(node) > 0) && (node[a] != ')'));
242 strcpy(&node[a], &node[a + 1]);
244 /* if there's a set of angle brackets, strip it down to that */
245 if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
246 while ((strlen(node) > 0) && (node[0] != '<')) {
247 strcpy(&node[0], &node[1]);
249 strcpy(&node[0], &node[1]);
250 for (a = 0; a < strlen(node); ++a)
255 /* If no node specified, tack ours on instead */
257 (haschar(node, '@')==0)
258 && (haschar(node, '%')==0)
259 && (haschar(node, '!')==0)
261 strcpy(node, config.c_nodename);
266 /* strip anything to the left of a @ */
267 while ((strlen(node) > 0) && (haschar(node, '@') > 0))
268 strcpy(node, &node[1]);
270 /* strip anything to the left of a % */
271 while ((strlen(node) > 0) && (haschar(node, '%') > 0))
272 strcpy(node, &node[1]);
274 /* reduce multiple system bang paths to node!user */
275 while ((strlen(node) > 0) && (haschar(node, '!') > 1))
276 strcpy(node, &node[1]);
278 /* now get rid of the user portion of a node!user string */
279 for (a = 0; a < strlen(node); ++a)
284 /* strip leading and trailing spaces in all strings */
293 * Back end for convert_internet_address()
294 * (Compares an internet name [buffer1] and stores in [buffer2] if found)
296 void try_name(struct usersupp *us, void *data) {
298 struct trynamebuf *tnb;
299 tnb = (struct trynamebuf *)data;
301 if (!strncasecmp(tnb->buffer1, "cit", 3))
302 if (atol(&tnb->buffer1[3]) == us->usernum)
303 strcpy(tnb->buffer2, us->fullname);
305 if (!collapsed_strcmp(tnb->buffer1, us->fullname))
306 strcpy(tnb->buffer2, us->fullname);
308 if (us->uid != BBSUID) {
309 pw = getpwuid(us->uid);
311 if (!strcasecmp(tnb->buffer1, pw->pw_name)) {
312 strcpy(tnb->buffer2, us->fullname);
320 * Convert an Internet email address to a Citadel user/host combination
322 int convert_internet_address(char *destuser, char *desthost, char *source)
327 struct quickroom qrbuf;
330 struct trynamebuf tnb;
333 char sourcealias[1024];
335 safestrncpy(sourcealias, source, sizeof(sourcealias) );
340 process_rfc822_addr(sourcealias, user, node, name);
341 lprintf(9, "process_rfc822_addr() converted to <%s@%s> (%s)\n",
344 /* Map the FQDN to a Citadel node name
346 hostalias = CtdlHostAlias(node);
348 case hostalias_localhost:
349 strcpy(node, config.c_nodename);
352 case hostalias_gatewaydomain:
353 extract_token(buf, node, 0, '.');
354 safestrncpy(node, buf, sizeof buf);
357 /* Now try to resolve the name
358 * FIXME ... do the multiple-addresses thing
360 if (!strcasecmp(node, config.c_nodename)) {
363 /* First, see if we hit an alias. Don't do this more than
364 * a few times, in case we accidentally hit an alias loop
366 strcpy(sourcealias, user);
368 if ( (strcasecmp(user, sourcealias)) && (++passes < 3) )
371 /* Try all local rooms */
372 if (!strncasecmp(user, "room_", 5)) {
373 strcpy(name, &user[5]);
374 for (i=0; i<strlen(name); ++i)
375 if (name[i]=='_') name[i]=' ';
376 if (getroom(&qrbuf, name) == 0) {
377 strcpy(destuser, qrbuf.QRname);
378 strcpy(desthost, config.c_nodename);
379 return rfc822_room_delivery;
383 /* Try all local users */
384 strcpy(destuser, user);
385 strcpy(desthost, config.c_nodename);
386 strcpy(tnb.buffer1, user);
387 strcpy(tnb.buffer2, "");
388 ForEachUser(try_name, &tnb);
389 if (strlen(tnb.buffer2) == 0) return(rfc822_no_such_user);
390 strcpy(destuser, tnb.buffer2);
391 return(rfc822_address_locally_validated);
394 strcpy(destuser, user);
395 strcpy(desthost, node);
396 if (hostalias == hostalias_gatewaydomain)
397 return(rfc822_address_on_citadel_network);
398 return(rfc822_address_nonlocal);
405 * convert_field() is a helper function for convert_internet_message().
406 * Given start/end positions for an rfc822 field, it converts it to a Citadel
407 * field if it wants to, and unfolds it if necessary.
409 * Returns 1 if the field was converted and inserted into the Citadel message
410 * structure, implying that the source field should be removed from the
413 int convert_field(struct CtdlMessage *msg, int beg, int end) {
426 rfc822 = msg->cm_fields['M']; /* M field contains rfc822 text */
427 for (i = end; i >= beg; --i) {
428 if (rfc822[i] == ':') colonpos = i;
431 if (colonpos < 0) return(0); /* no colon? not a valid header line */
433 key = mallok((end - beg) + 2);
434 safestrncpy(key, &rfc822[beg], (end-beg)+1);
435 key[colonpos - beg] = 0;
436 value = &key[(colonpos - beg) + 1];
437 unfold_rfc822_field(value);
440 * Here's the big rfc822-to-citadel loop.
443 /* Date/time is converted into a unix timestamp. If the conversion
444 * fails, we replace it with the time the message arrived locally.
446 if (!strcasecmp(key, "Date")) {
447 parsed_date = parsedate(value);
448 if (parsed_date < 0L) parsed_date = time(NULL);
449 snprintf(buf, sizeof buf, "%ld", parsed_date );
450 if (msg->cm_fields['T'] == NULL)
451 msg->cm_fields['T'] = strdoop(buf);
455 else if (!strcasecmp(key, "From")) {
456 process_rfc822_addr(value, user, node, name);
457 lprintf(9, "Converted to <%s@%s> (%s)\n", user, node, name);
458 snprintf(addr, sizeof addr, "%s@%s", user, node);
459 if (msg->cm_fields['A'] == NULL)
460 msg->cm_fields['A'] = strdoop(name);
462 if (msg->cm_fields['F'] == NULL)
463 msg->cm_fields['F'] = strdoop(addr);
467 else if (!strcasecmp(key, "Subject")) {
468 if (msg->cm_fields['U'] == NULL)
469 msg->cm_fields['U'] = strdoop(value);
473 else if (!strcasecmp(key, "Message-ID")) {
474 if (msg->cm_fields['I'] != NULL) {
475 lprintf(5, "duplicate message id\n");
478 if (msg->cm_fields['I'] == NULL) {
479 msg->cm_fields['I'] = strdoop(value);
481 /* Strip angle brackets */
482 while (haschar(msg->cm_fields['I'], '<') > 0) {
483 strcpy(&msg->cm_fields['I'][0],
484 &msg->cm_fields['I'][1]);
486 for (i = 0; i<strlen(msg->cm_fields['I']); ++i)
487 if (msg->cm_fields['I'][i] == '>')
488 msg->cm_fields['I'][i] = 0;
494 /* Clean up and move on. */
495 phree(key); /* Don't free 'value', it's actually the same buffer */
501 * Convert an RFC822 message (headers + body) to a CtdlMessage structure.
502 * NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
503 * will be deallocated when CtdlFreeMessage() is called. Therefore, the
504 * supplied buffer should be DEREFERENCED. It should not be freed or used
507 struct CtdlMessage *convert_internet_message(char *rfc822) {
509 struct CtdlMessage *msg;
510 int pos, beg, end, msglen;
515 msg = mallok(sizeof(struct CtdlMessage));
516 if (msg == NULL) return msg;
518 memset(msg, 0, sizeof(struct CtdlMessage));
519 msg->cm_magic = CTDLMESSAGE_MAGIC; /* self check */
520 msg->cm_anon_type = 0; /* never anonymous */
521 msg->cm_format_type = FMT_RFC822; /* internet message */
522 msg->cm_fields['M'] = rfc822;
524 lprintf(9, "Unconverted RFC822 message length = %d\n", strlen(rfc822));
530 /* Locate beginning and end of field, keeping in mind that
531 * some fields might be multiline
536 msglen = strlen(rfc822);
537 while ( (end < 0) && (done == 0) ) {
539 if ((rfc822[pos]=='\n')
540 && (!isspace(rfc822[pos+1]))) {
544 /* done with headers? */
545 if ( ((rfc822[pos]=='\n')
546 ||(rfc822[pos]=='\r') )
547 && ( (rfc822[pos+1]=='\n')
548 ||(rfc822[pos+1]=='\r')) ) {
553 if (pos >= (msglen-1) ) {
562 /* At this point we have a field. Are we interested in it? */
563 converted = convert_field(msg, beg, end);
565 /* Strip the field out of the RFC822 header if we used it */
567 strcpy(&rfc822[beg], &rfc822[pos]);
571 /* If we've hit the end of the message, bail out */
572 if (pos > strlen(rfc822)) done = 1;
575 /* Follow-up sanity checks... */
577 /* If there's no timestamp on this message, set it to now. */
578 if (msg->cm_fields['T'] == NULL) {
579 snprintf(buf, sizeof buf, "%ld", time(NULL));
580 msg->cm_fields['T'] = strdoop(buf);
583 lprintf(9, "RFC822 length remaining after conversion = %d\n",
591 * Look for a particular header field in an RFC822 message text. If the
592 * requested field is found, it is unfolded (if necessary) and returned to
593 * the caller. The field name is stripped out, leaving only its contents.
594 * The caller is responsible for freeing the returned buffer. If the requested
595 * field is not present, or anything else goes wrong, it returns NULL.
597 char *rfc822_fetch_field(char *rfc822, char *fieldname) {
602 char *fieldbuf = NULL;
604 /* Should never happen, but sometimes we get stupid */
605 if (rfc822 == NULL) return(NULL);
606 if (fieldname == NULL) return(NULL);
610 /* Locate beginning and end of field, keeping in mind that
611 * some fields might be multiline
615 for (pos=beg; ((pos<=strlen(rfc822))&&(end<0)); ++pos) {
616 if ((rfc822[pos]=='\n')
617 && (!isspace(rfc822[pos+1]))) {
620 if ( (rfc822[pos]=='\n') /* done w. headers? */
621 && ( (rfc822[pos+1]=='\n')
622 ||(rfc822[pos+1]=='\r'))) {
629 /* At this point we have a field. Is it The One? */
631 fieldbuf = mallok((end-beg)+3);
632 if (fieldbuf == NULL) return(NULL);
633 safestrncpy(fieldbuf, &rfc822[beg], (end-beg)+1);
634 unfold_rfc822_field(fieldbuf);
636 for (i = strlen(fieldbuf); i >= 0; --i) {
637 if (fieldbuf[i] == ':') colonpos = i;
640 fieldbuf[colonpos] = 0;
641 if (!strcasecmp(fieldbuf, fieldname)) {
642 strcpy(fieldbuf, &fieldbuf[colonpos+1]);
650 /* If we've hit the end of the message, bail out */
651 if (pos > strlen(rfc822)) done = 1;