2  * Copyright (c) 1998-2003, 2006 Proofpoint, Inc. and its suppliers.
4  * Copyright (c) 1983, 1995-1997 Eric P. Allman.  All rights reserved.
18 SM_RCSID("@(#)$Id: udb.c,v 8.166 2013-11-22 20:51:57 ca Exp $ (with USERDB)")
20 SM_RCSID("@(#)$Id: udb.c,v 8.166 2013-11-22 20:51:57 ca Exp $ (without USERDB)")
38 **  UDB.C -- interface between sendmail and Berkeley User Data Base.
52 		/* type UE_REMOTE -- do remote call for lookup */
62 		/* type UE_FORWARD -- forward message to remote */
70 		/* type UE_FETCH -- look up in local database */
84 # define UDB_REMOTE	2	/* look up in remote database */
85 # define UDB_DBFETCH	3	/* look up in local database */
87 # define UDB_HESIOD	5	/* look up via hesiod */
105 **  UDBEXPAND -- look up user in database and expand
108 **		a -- address to expand.
109 **		sendq -- pointer to head of sendq to put the expansions in.
110 **		aliaslevel -- the current alias nesting depth.
111 **		e -- the current envelope.
114 **		EX_TEMPFAIL -- if something "odd" happened -- probably due
116 **		EX_OK -- otherwise.
136 	register struct udbent *up;  local
146 		sm_dprintf("udbexpand(%s)\n", a->q_paddr);
149 	if (!QS_IS_SENDABLE(a->q_state))
151 	e->e_to = a->q_paddr;
165 	user = a->q_user;
185 	for (up = UdbEnts; !breakout; up++)
203 		userleft = sizeof(userbuf) - 1;
214 		switch (up->udb_type)
224 			i = (*up->udb_dbp->seq)(up->udb_dbp, &key, &info, R_CURSOR);
229 			    (errno = (*up->udb_dbp->cursor)(up->udb_dbp,
232 			    (errno = (*up->udb_dbp->cursor)(up->udb_dbp,
235 				i = -1;
237 			    (errno = dbc->c_get(dbc, &key,
249 					(void) dbc->c_close(dbc);
260 			a->q_flags &= ~QSELFREF;
266 				if (bitset(EF_VRFYONLY, e->e_flags))
268 					a->q_state = QS_VERIFIED;
272 						(void) dbc->c_close(dbc);
280 				if (info.size >= userleft - 1)
300 					userleft--;
304 				userleft -= info.size;
308 				i = (*up->udb_dbp->seq)(up->udb_dbp, &key, &info, R_NEXT);
311 				if ((errno = dbc->c_get(dbc, &key,
320 				(void) dbc->c_close(dbc);
331 				sm_syslog(LOG_INFO, e->e_id,
333 					  e->e_to,
336 			if (naddrs > 0 && !bitset(QSELFREF, a->q_flags))
343 				a->q_state = QS_EXPANDED;
347 				syserr("udbexpand: db-get %.*s stat %d",
353 			**  If this address has a -request address, reflect
359 			(void) sm_strlcpyn(keybuf, sizeof(keybuf), 2, a->q_user,
366 			i = (*up->udb_dbp->get)(up->udb_dbp, &key, &info, 0);
368 			i = errno = (*up->udb_dbp->get)(up->udb_dbp, NULL,
373 			a->q_owner = sm_rpool_malloc_x(e->e_rpool,
375 			memmove(a->q_owner, info.data, info.size);
376 			a->q_owner[info.size] = '\0';
379 			if (e->e_xfp != NULL)
381 				(void) sm_io_fprintf(e->e_xfp, SM_TIME_DEFAULT,
383 						     a->q_paddr);
385 			e->e_flags |= EF_SENDRECEIPT;
386 			a->q_flags |= QDELIVERED|QEXPANDED;
397 			/* look up the key via hesiod */
401 				syserr("udbexpand: hesiod-get %.*s stat %d",
417 						a->q_user);
418 				hp = hes_getmailhost(a->q_user);
423 						syserr("udbexpand: hesiod-getmail %s stat %d",
424 							a->q_user, hes_error());
429 							a->q_user, hes_error());
432 				if (strlen(hp->po_name) + strlen(hp->po_host) >
433 				    sizeof(pobuf) - 2)
437 							a->q_user,
438 							hp->po_name,
439 							hp->po_host);
444 					"%s@%s", hp->po_name, hp->po_host);
454 			a->q_flags &= ~QSELFREF;
456 			if (bitset(EF_VRFYONLY, e->e_flags))
458 				a->q_state = QS_VERIFIED;
470 				sm_syslog(LOG_INFO, e->e_id,
472 					  e->e_to,
476 			if (naddrs > 0 && !bitset(QSELFREF, a->q_flags))
483 				a->q_state = QS_EXPANDED;
487 			**  If this address has a -request address, reflect
491 			(void) sm_strlcpyn(keybuf, sizeof(keybuf), 2, a->q_user,
499 			a->q_owner = sm_rpool_malloc_x(e->e_rpool,
501 			memmove(a->q_owner, info.data, info.size);
502 			a->q_owner[info.size] = '\0';
511 			if (bitset(EF_VRFYONLY, e->e_flags))
513 				a->q_state = QS_VERIFIED;
516 			i = strlen(up->udb_fwdhost) + strlen(a->q_user) + 1;
523 					a->q_user, "@", up->udb_fwdhost);
525 			a->q_flags &= ~QSELFREF;
527 			if (naddrs > 0 && !bitset(QSELFREF, a->q_flags))
534 				a->q_state = QS_EXPANDED;
554 **  UDBSENDER -- return canonical external name of sender, given local name
557 **		sender -- the name of the sender on the local machine.
558 **		rpool -- resource pool from which to allocate result
563 **		NULL -- if nothing is changed from the database.
577 **  UDBMATCH -- match user in field, return result of lookup.
580 **		user -- the name of the user.
581 **		field -- the field to look up.
582 **		rpool -- resource pool from which to allocate result
587 **		NULL -- if nothing is changed from the database.
599 	register struct udbent *up;  local
629 	if ((strlen(user) + i) > sizeof(keybuf) - 4)
642 	for (up = UdbEnts; up->udb_type != UDB_EOLIST; up++)
648 		switch (up->udb_type)
657 			i = (*up->udb_dbp->get)(up->udb_dbp, &key, &info, 0);
659 			i = errno = (*up->udb_dbp->get)(up->udb_dbp, NULL,
716 	for (up = UdbEnts; up->udb_type != UDB_EOLIST; up++)
718 		switch (up->udb_type)
723 			if (up->udb_default == NULL)
730 				i = (*up->udb_dbp->get)(up->udb_dbp,
733 				i = errno = (*up->udb_dbp->get)(up->udb_dbp,
740 					up->udb_default = "";
745 				up->udb_default = sm_pmalloc_x(info.size + 1);
746 				memmove(up->udb_default, info.data, info.size);
747 				up->udb_default[info.size] = '\0';
749 			else if (up->udb_default[0] == '\0')
752 			/* we have a default case -- verify user:maildrop */
758 			i = (*up->udb_dbp->get)(up->udb_dbp, &key, &info, 0);
760 			i = errno = (*up->udb_dbp->get)(up->udb_dbp, NULL,
765 				/* nope -- no aliasing for this user */
769 			/* they exist -- build the actual address */
770 			i = strlen(user) + strlen(up->udb_default) + 2;
772 			(void) sm_strlcpyn(p, i, 3, user, "@", up->udb_default);
781 			if (up->udb_default == NULL)
790 					up->udb_default = "";
795 				up->udb_default = sm_pmalloc_x(info.size + 1);
796 				memmove(up->udb_default, info.data, info.size);
797 				up->udb_default[info.size] = '\0';
799 			else if (up->udb_default[0] == '\0')
802 			/* we have a default case -- verify user:maildrop */
808 				/* nope -- no aliasing for this user */
812 			/* they exist -- build the actual address */
813 			i = strlen(user) + strlen(up->udb_default) + 2;
815 			(void) sm_strlcpyn(p, i, 3, user, "@", up->udb_default);
828 **  UDB_MAP_LOOKUP -- look up arbitrary entry in user database map
831 **		map -- the map being queried.
832 **		name -- the name to look up.
833 **		av -- arguments to the map lookup.
834 **		statp -- to get any error status.
855 		sm_dprintf("udb_map_lookup(%s, %s)\n", map->map_mname, name);
857 	if (bitset(MF_NOFOLDCASE, map->map_mflags))
863 		if (keysize > sizeof(keybuf) - 1)
864 			keysize = sizeof(keybuf) - 1;
870 	val = udbmatch(key, map->map_file, NULL);
874 		if (bitset(MF_MATCHONLY, map->map_mflags))
886 **  _UDBX_INIT -- parse the UDB specification, opening any valid entries.
889 **		e -- the current envelope.
892 **		EX_TEMPFAIL -- if it appeared it couldn't get hold of a
895 **		EX_OK -- otherwise.
909 	register struct udbent *up;  local
920 	up = UdbEnts;
953 		**	@hostname --	forward email to the indicated host.
956 		**	/dbname	 --	search the named database on the local
958 		**	Hesiod --	search the named database with BIND
965 			up->udb_type = UDB_FORWARD;
966 			up->udb_pid = CurrentPid;
967 			up->udb_fwdhost = spec + 1;
969 			up++;
977 			up->udb_type = UDB_HESIOD;
978 			up->udb_pid = CurrentPid;
980 			up++;
985 		  case '/':	/* look up remote name */
987 			if (l > 3 && strcmp(&spec[l - 3], ".db") == 0)
989 				up->udb_dbname = spec;
993 				up->udb_dbname = sm_pmalloc_x(l + 4);
994 				(void) sm_strlcpyn(up->udb_dbname, l + 4, 2,
999 			up->udb_dbp = dbopen(up->udb_dbname, O_RDONLY,
1009 				up->udb_dbp = NULL;
1011 				ret = db_create(&up->udb_dbp, NULL, 0);
1014 					(void) up->udb_dbp->close(up->udb_dbp,
1016 					up->udb_dbp = NULL;
1020 					ret = up->udb_dbp->open(up->udb_dbp,
1022 								up->udb_dbname,
1033 						(void) up->udb_dbp->close(up->udb_dbp, 0);
1034 						up->udb_dbp = NULL;
1039 				errno = db_open(up->udb_dbname, DB_BTREE,
1041 						NULL, &up->udb_dbp);
1045 			if (up->udb_dbp == NULL)
1056 						up->udb_dbname,
1063 						sm_syslog(LOG_ERR, e->e_id,
1069 							  up->udb_dbname,
1071 					up->udb_type = UDB_EOLIST;
1072 					if (up->udb_dbname != spec)
1073 						sm_free(up->udb_dbname); /* XXX */
1076 				if (up->udb_dbname != spec)
1077 					sm_free(up->udb_dbname); /* XXX */
1087 					up->udb_dbname);
1089 			up->udb_type = UDB_DBFETCH;
1090 			up->udb_pid = CurrentPid;
1092 			up++;
1104 	up->udb_type = UDB_EOLIST;
1108 		for (up = UdbEnts; up->udb_type != UDB_EOLIST; up++)
1110 			switch (up->udb_type)
1114 					   anynet_ntoa((SOCKADDR *) &up->udb_addr),
1115 					   up->udb_timeout);
1120 				sm_dprintf("FETCH: file %s\n", up->udb_dbname);
1128 					up->udb_fwdhost);
1152 	for (up = UdbEnts; up->udb_type != UDB_EOLIST; up++)
1154 		if (up->udb_type == UDB_DBFETCH)
1157 			(*up->udb_dbp->close)(up->udb_dbp);
1159 			errno = (*up->udb_dbp->close)(up->udb_dbp, 0);
1162 				sm_dprintf("_udbx_init: db->close(%s)\n",
1163 					up->udb_dbname);
1200 **  _UDBX_CLOSE -- close all file based UDB entries.
1211 	struct udbent *up;  in _udbx_close()  local
1216 	for (up = UdbEnts; up->udb_type != UDB_EOLIST; up++)  in _udbx_close()
1218 		if (up->udb_pid != CurrentPid)  in _udbx_close()
1222 		if (up->udb_type == UDB_DBFETCH)  in _udbx_close()
1225 			(*up->udb_dbp->close)(up->udb_dbp);  in _udbx_close()
1227 			errno = (*up->udb_dbp->close)(up->udb_dbp, 0);  in _udbx_close()
1231 			sm_dprintf("_udbx_close: db->close(%s)\n",  in _udbx_close()
1232 				up->udb_dbname);  in _udbx_close()
1248 	if (sm_strlcpy(kbuf, key->data, sizeof(kbuf)) >= sizeof(kbuf))
1264 		return -1;
1269 	*--type = ':';
1277 			return -1;
1285 			return -1;
1297 		**  XXX it is legal for :maildrop to be multi-valued.
1300 		info->data = hp[0];
1301 		info->size = (size_t) strlen(info->data);