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 stripout(name, '<', '>');
157 /* strip anything to the left of a bang */
158 while ((strlen(name) > 0) && (haschar(name, '!') > 0))
159 strcpy(name, &name[1]);
161 /* and anything to the right of a @ or % */
162 for (a = 0; a < strlen(name); ++a) {
169 /* but if there are parentheses, that changes the rules... */
170 if ((haschar(rfc822, '(') == 1) && (haschar(rfc822, ')') == 1)) {
171 strcpy(name, rfc822);
172 stripallbut(name, '(', ')');
175 /* but if there are a set of quotes, that supersedes everything */
176 if (haschar(rfc822, 34) == 2) {
177 strcpy(name, rfc822);
178 while ((strlen(name) > 0) && (name[0] != 34)) {
179 strcpy(&name[0], &name[1]);
181 strcpy(&name[0], &name[1]);
182 for (a = 0; a < strlen(name); ++a)
186 /* extract user id */
187 strcpy(user, rfc822);
189 /* first get rid of anything in parens */
190 stripout(user, '(', ')');
192 /* if there's a set of angle brackets, strip it down to that */
193 if ((haschar(user, '<') == 1) && (haschar(user, '>') == 1)) {
194 stripallbut(user, '<', '>');
197 /* strip anything to the left of a bang */
198 while ((strlen(user) > 0) && (haschar(user, '!') > 0))
199 strcpy(user, &user[1]);
201 /* and anything to the right of a @ or % */
202 for (a = 0; a < strlen(user); ++a) {
210 /* extract node name */
211 strcpy(node, rfc822);
213 /* first get rid of anything in parens */
214 stripout(node, '(', ')');
216 /* if there's a set of angle brackets, strip it down to that */
217 if ((haschar(node, '<') == 1) && (haschar(node, '>') == 1)) {
218 stripallbut(node, '<', '>');
221 /* If no node specified, tack ours on instead */
223 (haschar(node, '@')==0)
224 && (haschar(node, '%')==0)
225 && (haschar(node, '!')==0)
227 strcpy(node, config.c_nodename);
232 /* strip anything to the left of a @ */
233 while ((strlen(node) > 0) && (haschar(node, '@') > 0))
234 strcpy(node, &node[1]);
236 /* strip anything to the left of a % */
237 while ((strlen(node) > 0) && (haschar(node, '%') > 0))
238 strcpy(node, &node[1]);
240 /* reduce multiple system bang paths to node!user */
241 while ((strlen(node) > 0) && (haschar(node, '!') > 1))
242 strcpy(node, &node[1]);
244 /* now get rid of the user portion of a node!user string */
245 for (a = 0; a < strlen(node); ++a)
250 /* strip leading and trailing spaces in all strings */
259 * Back end for convert_internet_address()
260 * (Compares an internet name [buffer1] and stores in [buffer2] if found)
262 void try_name(struct usersupp *us, void *data) {
264 struct trynamebuf *tnb;
265 tnb = (struct trynamebuf *)data;
267 if (!strncasecmp(tnb->buffer1, "cit", 3))
268 if (atol(&tnb->buffer1[3]) == us->usernum)
269 strcpy(tnb->buffer2, us->fullname);
271 if (!collapsed_strcmp(tnb->buffer1, us->fullname))
272 strcpy(tnb->buffer2, us->fullname);
274 if (us->uid != BBSUID) {
275 pw = getpwuid(us->uid);
277 if (!strcasecmp(tnb->buffer1, pw->pw_name)) {
278 strcpy(tnb->buffer2, us->fullname);
286 * Convert an Internet email address to a Citadel user/host combination
288 int convert_internet_address(char *destuser, char *desthost, char *source)
293 struct quickroom qrbuf;
296 struct trynamebuf tnb;
299 char sourcealias[1024];
301 safestrncpy(sourcealias, source, sizeof(sourcealias) );
306 process_rfc822_addr(sourcealias, user, node, name);
307 lprintf(9, "process_rfc822_addr() converted to <%s@%s> (%s)\n",
310 /* Map the FQDN to a Citadel node name
312 hostalias = CtdlHostAlias(node);
314 case hostalias_localhost:
315 strcpy(node, config.c_nodename);
318 case hostalias_gatewaydomain:
319 extract_token(buf, node, 0, '.');
320 safestrncpy(node, buf, sizeof buf);
323 /* Now try to resolve the name
324 * FIXME ... do the multiple-addresses thing
326 if (!strcasecmp(node, config.c_nodename)) {
329 /* First, see if we hit an alias. Don't do this more than
330 * a few times, in case we accidentally hit an alias loop
332 strcpy(sourcealias, user);
334 if ( (strcasecmp(user, sourcealias)) && (++passes < 3) )
337 /* Try all local rooms */
338 if (!strncasecmp(user, "room_", 5)) {
339 strcpy(name, &user[5]);
340 for (i=0; i<strlen(name); ++i)
341 if (name[i]=='_') name[i]=' ';
342 if (getroom(&qrbuf, name) == 0) {
343 strcpy(destuser, qrbuf.QRname);
344 strcpy(desthost, config.c_nodename);
345 return rfc822_room_delivery;
349 /* Try all local users */
350 strcpy(destuser, user);
351 strcpy(desthost, config.c_nodename);
352 strcpy(tnb.buffer1, user);
353 strcpy(tnb.buffer2, "");
354 ForEachUser(try_name, &tnb);
355 if (strlen(tnb.buffer2) == 0) return(rfc822_no_such_user);
356 strcpy(destuser, tnb.buffer2);
357 return(rfc822_address_locally_validated);
360 strcpy(destuser, user);
361 strcpy(desthost, node);
362 if (hostalias == hostalias_gatewaydomain)
363 return(rfc822_address_on_citadel_network);
364 return(rfc822_address_nonlocal);
371 * convert_field() is a helper function for convert_internet_message().
372 * Given start/end positions for an rfc822 field, it converts it to a Citadel
373 * field if it wants to, and unfolds it if necessary.
375 * Returns 1 if the field was converted and inserted into the Citadel message
376 * structure, implying that the source field should be removed from the
379 int convert_field(struct CtdlMessage *msg, int beg, int end) {
392 rfc822 = msg->cm_fields['M']; /* M field contains rfc822 text */
393 for (i = end; i >= beg; --i) {
394 if (rfc822[i] == ':') colonpos = i;
397 if (colonpos < 0) return(0); /* no colon? not a valid header line */
399 key = mallok((end - beg) + 2);
400 safestrncpy(key, &rfc822[beg], (end-beg)+1);
401 key[colonpos - beg] = 0;
402 value = &key[(colonpos - beg) + 1];
403 unfold_rfc822_field(value);
406 * Here's the big rfc822-to-citadel loop.
409 /* Date/time is converted into a unix timestamp. If the conversion
410 * fails, we replace it with the time the message arrived locally.
412 if (!strcasecmp(key, "Date")) {
413 parsed_date = parsedate(value);
414 if (parsed_date < 0L) parsed_date = time(NULL);
415 snprintf(buf, sizeof buf, "%ld", parsed_date );
416 if (msg->cm_fields['T'] == NULL)
417 msg->cm_fields['T'] = strdoop(buf);
421 else if (!strcasecmp(key, "From")) {
422 process_rfc822_addr(value, user, node, name);
423 lprintf(9, "Converted to <%s@%s> (%s)\n", user, node, name);
424 snprintf(addr, sizeof addr, "%s@%s", user, node);
425 if (msg->cm_fields['A'] == NULL)
426 msg->cm_fields['A'] = strdoop(name);
428 if (msg->cm_fields['F'] == NULL)
429 msg->cm_fields['F'] = strdoop(addr);
433 else if (!strcasecmp(key, "Subject")) {
434 if (msg->cm_fields['U'] == NULL)
435 msg->cm_fields['U'] = strdoop(value);
439 else if (!strcasecmp(key, "Message-ID")) {
440 if (msg->cm_fields['I'] != NULL) {
441 lprintf(5, "duplicate message id\n");
444 if (msg->cm_fields['I'] == NULL) {
445 msg->cm_fields['I'] = strdoop(value);
447 /* Strip angle brackets */
448 while (haschar(msg->cm_fields['I'], '<') > 0) {
449 strcpy(&msg->cm_fields['I'][0],
450 &msg->cm_fields['I'][1]);
452 for (i = 0; i<strlen(msg->cm_fields['I']); ++i)
453 if (msg->cm_fields['I'][i] == '>')
454 msg->cm_fields['I'][i] = 0;
460 /* Clean up and move on. */
461 phree(key); /* Don't free 'value', it's actually the same buffer */
467 * Convert an RFC822 message (headers + body) to a CtdlMessage structure.
468 * NOTE: the supplied buffer becomes part of the CtdlMessage structure, and
469 * will be deallocated when CtdlFreeMessage() is called. Therefore, the
470 * supplied buffer should be DEREFERENCED. It should not be freed or used
473 struct CtdlMessage *convert_internet_message(char *rfc822) {
475 struct CtdlMessage *msg;
476 int pos, beg, end, msglen;
481 msg = mallok(sizeof(struct CtdlMessage));
482 if (msg == NULL) return msg;
484 memset(msg, 0, sizeof(struct CtdlMessage));
485 msg->cm_magic = CTDLMESSAGE_MAGIC; /* self check */
486 msg->cm_anon_type = 0; /* never anonymous */
487 msg->cm_format_type = FMT_RFC822; /* internet message */
488 msg->cm_fields['M'] = rfc822;
490 lprintf(9, "Unconverted RFC822 message length = %d\n", strlen(rfc822));
496 /* Locate beginning and end of field, keeping in mind that
497 * some fields might be multiline
502 msglen = strlen(rfc822);
503 while ( (end < 0) && (done == 0) ) {
505 if ((rfc822[pos]=='\n')
506 && (!isspace(rfc822[pos+1]))) {
510 /* done with headers? */
511 if ( ((rfc822[pos]=='\n')
512 ||(rfc822[pos]=='\r') )
513 && ( (rfc822[pos+1]=='\n')
514 ||(rfc822[pos+1]=='\r')) ) {
519 if (pos >= (msglen-1) ) {
528 /* At this point we have a field. Are we interested in it? */
529 converted = convert_field(msg, beg, end);
531 /* Strip the field out of the RFC822 header if we used it */
533 strcpy(&rfc822[beg], &rfc822[pos]);
537 /* If we've hit the end of the message, bail out */
538 if (pos > strlen(rfc822)) done = 1;
541 /* Follow-up sanity checks... */
543 /* If there's no timestamp on this message, set it to now. */
544 if (msg->cm_fields['T'] == NULL) {
545 snprintf(buf, sizeof buf, "%ld", time(NULL));
546 msg->cm_fields['T'] = strdoop(buf);
549 lprintf(9, "RFC822 length remaining after conversion = %d\n",
557 * Look for a particular header field in an RFC822 message text. If the
558 * requested field is found, it is unfolded (if necessary) and returned to
559 * the caller. The field name is stripped out, leaving only its contents.
560 * The caller is responsible for freeing the returned buffer. If the requested
561 * field is not present, or anything else goes wrong, it returns NULL.
563 char *rfc822_fetch_field(char *rfc822, char *fieldname) {
568 char *fieldbuf = NULL;
570 /* Should never happen, but sometimes we get stupid */
571 if (rfc822 == NULL) return(NULL);
572 if (fieldname == NULL) return(NULL);
576 /* Locate beginning and end of field, keeping in mind that
577 * some fields might be multiline
581 for (pos=beg; ((pos<=strlen(rfc822))&&(end<0)); ++pos) {
582 if ((rfc822[pos]=='\n')
583 && (!isspace(rfc822[pos+1]))) {
586 if ( (rfc822[pos]=='\n') /* done w. headers? */
587 && ( (rfc822[pos+1]=='\n')
588 ||(rfc822[pos+1]=='\r'))) {
595 /* At this point we have a field. Is it The One? */
597 fieldbuf = mallok((end-beg)+3);
598 if (fieldbuf == NULL) return(NULL);
599 safestrncpy(fieldbuf, &rfc822[beg], (end-beg)+1);
600 unfold_rfc822_field(fieldbuf);
602 for (i = strlen(fieldbuf); i >= 0; --i) {
603 if (fieldbuf[i] == ':') colonpos = i;
606 fieldbuf[colonpos] = 0;
607 if (!strcasecmp(fieldbuf, fieldname)) {
608 strcpy(fieldbuf, &fieldbuf[colonpos+1]);
616 /* If we've hit the end of the message, bail out */
617 if (pos > strlen(rfc822)) done = 1;