smtpd.h revision 1.86 
1/*	$OpenBSD: smtpd.h,v 1.86 2009/03/08 20:39:49 gilles Exp $	*/
2
3/*
4 * Copyright (c) 2008 Gilles Chehade <gilles@openbsd.org>
5 * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#define CONF_FILE		 "/etc/mail/smtpd.conf"
21#define MAX_LISTEN		 16
22#define PROC_COUNT		 9
23#define READ_BUF_SIZE		 32768
24#define MAX_NAME_SIZE		 64
25
26#define MAX_HOPS_COUNT		 100
27
28/* sizes include the tailing '\0' */
29#define MAX_LINE_SIZE		 1024
30#define MAX_LOCALPART_SIZE	 65
31#define MAX_DOMAINPART_SIZE	 MAXHOSTNAMELEN
32#define MAX_ID_SIZE		 64
33
34/* return and forward path size */
35#define MAX_PATH_SIZE		 256
36
37/* makemap mapped value text length */
38#define MAX_MAKEMAP_SIZE	 256
39
40/*#define SMTPD_CONNECT_TIMEOUT	 (60)*/
41#define SMTPD_CONNECT_TIMEOUT	 (10)
42#define SMTPD_QUEUE_INTERVAL	 (15 * 60)
43#define SMTPD_QUEUE_MAXINTERVAL	 (4 * 60 * 60)
44#define SMTPD_QUEUE_EXPIRY	 (4 * 24 * 60 * 60)
45#define SMTPD_USER		 "_smtpd"
46#define SMTPD_SOCKET		 "/var/run/smtpd.sock"
47#define SMTPD_BANNER		 "220 %s ESMTP OpenSMTPD"
48#define SMTPD_SESSION_TIMEOUT	 300
49#define SMTPD_BACKLOG		 5
50
51#define	PATH_MAILLOCAL		"/usr/libexec/mail.local"
52
53#define	DIRHASH_BUCKETS		 4096
54
55#define PATH_SPOOL		"/var/spool/smtpd"
56
57#define PATH_ENQUEUE		"/enqueue"
58#define PATH_INCOMING		"/incoming"
59#define PATH_QUEUE		"/queue"
60#define PATH_PURGE		"/purge"
61
62#define PATH_MESSAGE		"/message"
63#define PATH_ENVELOPES		"/envelopes"
64
65#define PATH_RUNQUEUE		"/runqueue"
66#define PATH_RUNQUEUEHIGH	"/runqueue-high"
67#define PATH_RUNQUEUELOW	"/runqueue-low"
68
69/* number of MX records to lookup */
70#define MXARRAYSIZE	5
71
72/* rfc5321 limits */
73#define	SMTP_TEXTLINE_MAX	1000
74#define	SMTP_CMDLINE_MAX	512
75#define	SMTP_ANYLINE_MAX	SMTP_TEXTLINE_MAX
76
77#define F_STARTTLS		 0x01
78#define F_SSMTP			 0x02
79#define F_AUTH			 0x04
80#define F_SSL			(F_SSMTP|F_STARTTLS)
81
82
83struct netaddr {
84	struct sockaddr_storage ss;
85	int bits;
86};
87
88struct relayhost {
89	u_int8_t flags;
90	char hostname[MAXHOSTNAMELEN];
91	u_int16_t port;
92};
93
94struct mxhost {
95	u_int8_t flags;
96	struct sockaddr_storage ss;
97};
98
99/* buffer specific headers */
100struct buf {
101	TAILQ_ENTRY(buf)	 entry;
102	u_char			*buf;
103	size_t			 size;
104	size_t			 max;
105	size_t			 wpos;
106	size_t			 rpos;
107	int			 fd;
108};
109
110struct msgbuf {
111	TAILQ_HEAD(, buf)	 bufs;
112	u_int32_t		 queued;
113	int			 fd;
114};
115
116struct buf_read {
117	u_char			 buf[READ_BUF_SIZE];
118	u_char			*rptr;
119	size_t			 wpos;
120};
121
122struct imsg_fd  {
123	TAILQ_ENTRY(imsg_fd)	 entry;
124	int			 fd;
125	u_int32_t		 id;
126};
127
128struct imsgbuf {
129	TAILQ_HEAD(, imsg_fd)	 fds;
130	struct buf_read		 r;
131	struct msgbuf		 w;
132	struct event		 ev;
133	void			(*handler)(int, short, void *);
134	int			 fd;
135	pid_t			 pid;
136	short			 events;
137	void			*data;
138	u_int32_t		 id;
139};
140
141struct imsg_hdr {
142	u_int16_t		 type;
143	u_int16_t		 len;
144	u_int32_t		 peerid;
145	pid_t			 pid;
146};
147
148struct imsg {
149	struct imsg_hdr		 hdr;
150	u_int32_t		 id;
151	void			*data;
152};
153
154enum imsg_type {
155	IMSG_NONE,
156	IMSG_CTL_OK,		/* answer to smtpctl requests */
157	IMSG_CTL_FAIL,
158	IMSG_CTL_SHUTDOWN,
159	IMSG_CONF_START,
160	IMSG_CONF_SSL,
161	IMSG_CONF_SSL_CERT,
162	IMSG_CONF_SSL_KEY,
163	IMSG_CONF_LISTENER,
164	IMSG_CONF_MAP,
165	IMSG_CONF_RULE,
166	IMSG_CONF_CONDITION,
167	IMSG_CONF_OPTION,
168	IMSG_CONF_END,
169	IMSG_CONF_RELOAD,
170	IMSG_LKA_MAIL,
171	IMSG_LKA_RCPT,
172	IMSG_LKA_MX,
173	IMSG_LKA_HOST,
174	IMSG_MDA_MAILBOX_FILE,
175	IMSG_MDA_MESSAGE_FILE,
176	IMSG_MFA_RCPT,
177	IMSG_MFA_MAIL,
178
179	IMSG_QUEUE_CREATE_MESSAGE,
180	IMSG_QUEUE_SUBMIT_ENVELOPE,
181	IMSG_QUEUE_COMMIT_ENVELOPES,
182	IMSG_QUEUE_REMOVE_MESSAGE,
183	IMSG_QUEUE_COMMIT_MESSAGE,
184	IMSG_QUEUE_TEMPFAIL,
185	IMSG_QUEUE_STATS,
186
187	IMSG_QUEUE_REMOVE_SUBMISSION,
188	IMSG_QUEUE_MESSAGE_UPDATE,
189	IMSG_QUEUE_MESSAGE_FD,
190	IMSG_QUEUE_MESSAGE_FILE,
191
192	IMSG_RUNNER_UPDATE_ENVELOPE,
193	IMSG_RUNNER_STATS,
194	IMSG_RUNNER_SCHEDULE,
195
196	IMSG_BATCH_CREATE,
197	IMSG_BATCH_APPEND,
198	IMSG_BATCH_CLOSE,
199
200	IMSG_PARENT_FORWARD_OPEN,
201	IMSG_PARENT_MAILBOX_OPEN,
202	IMSG_PARENT_MESSAGE_OPEN,
203	IMSG_PARENT_MAILBOX_RENAME,
204	IMSG_PARENT_STATS,
205
206	IMSG_PARENT_AUTHENTICATE,
207	IMSG_PARENT_SEND_CONFIG,
208
209	IMSG_MDA_PAUSE,
210	IMSG_MTA_PAUSE,
211	IMSG_SMTP_PAUSE,
212	IMSG_SMTP_STATS,
213
214	IMSG_MDA_RESUME,
215	IMSG_MTA_RESUME,
216	IMSG_SMTP_RESUME,
217
218	IMSG_STATS
219};
220
221#define IMSG_HEADER_SIZE	 sizeof(struct imsg_hdr)
222#define	MAX_IMSGSIZE		 16384
223
224enum blockmodes {
225	BM_NORMAL,
226	BM_NONBLOCK
227};
228
229enum ctl_state {
230	CS_NONE = 0,
231	CS_INIT,
232	CS_RCPT,
233	CS_FD,
234	CS_DONE
235};
236
237struct ctl_conn {
238	TAILQ_ENTRY(ctl_conn)	 entry;
239	u_int8_t		 flags;
240#define CTL_CONN_NOTIFY		 0x01
241	struct imsgbuf		 ibuf;
242	enum ctl_state		 state;
243};
244TAILQ_HEAD(ctl_connlist, ctl_conn);
245
246typedef u_int32_t		 objid_t;
247
248struct ctl_id {
249	objid_t		 id;
250	char		 name[MAX_NAME_SIZE];
251};
252
253enum smtp_proc_type {
254	PROC_PARENT = 0,
255	PROC_SMTP,
256	PROC_MFA,
257	PROC_LKA,
258	PROC_QUEUE,
259	PROC_MDA,
260	PROC_MTA,
261	PROC_CONTROL,
262	PROC_RUNNER,
263} smtpd_process;
264
265struct peer {
266	enum smtp_proc_type	 id;
267	void			(*cb)(int, short, void *);
268};
269
270enum map_type {
271	T_SINGLE,
272	T_LIST,
273	T_HASH
274};
275
276enum map_src {
277	S_NONE,
278	S_DYN,
279	S_DNS,
280	S_FILE,
281	S_DB,
282	S_EXT
283};
284
285enum mapel_type {
286	ME_STRING,
287	ME_NET,
288	ME_NETMASK
289};
290
291struct mapel {
292	TAILQ_ENTRY(mapel)		 me_entry;
293	union mapel_data {
294		char			 med_string[MAX_LINE_SIZE];
295		struct netaddr		 med_addr;
296	}				 me_key;
297	union mapel_data		 me_val;
298};
299
300struct map {
301	TAILQ_ENTRY(map)		 m_entry;
302#define F_USED				 0x01
303#define F_DYNAMIC			 0x02
304	u_int8_t			 m_flags;
305	char				 m_name[MAX_LINE_SIZE];
306	objid_t				 m_id;
307	enum map_type			 m_type;
308	enum mapel_type			 m_eltype;
309	enum map_src			 m_src;
310	char				 m_config[MAXPATHLEN];
311	TAILQ_HEAD(mapel_list, mapel)	 m_contents;
312};
313
314enum cond_type {
315	C_ALL,
316	C_NET,
317	C_DOM
318};
319
320struct cond {
321	TAILQ_ENTRY(cond)		 c_entry;
322	objid_t				 c_map;
323	enum cond_type			 c_type;
324	struct map			*c_match;
325};
326
327enum opt_type {
328	O_RWUSER,			/* rewrite user */
329	O_RWDOMAIN,			/* rewrite domain */
330};
331
332struct opt {
333	TAILQ_ENTRY(opt)		 o_entry;
334	enum opt_type			 o_type;
335};
336
337enum action_type {
338	A_RELAY,
339	A_RELAYVIA,
340	A_MAILDIR,
341	A_MBOX,
342	A_FILENAME,
343	A_EXT
344};
345#define IS_MAILBOX(x)	((x) == A_MAILDIR || (x) == A_MBOX || (x) == A_FILENAME)
346#define IS_RELAY(x)	((x) == A_RELAY || (x) == A_RELAYVIA)
347#define IS_EXT(x)	((x) == A_EXT)
348
349struct rule {
350	TAILQ_ENTRY(rule)		 r_entry;
351	int				 r_accept;
352	struct map			*r_sources;
353	TAILQ_HEAD(condlist, cond)	 r_conditions;
354	enum action_type		 r_action;
355	union rule_dest {
356		char			 path[MAXPATHLEN];
357		struct relayhost       	 relayhost;
358#define	MAXCOMMANDLEN	256
359		char			 command[MAXCOMMANDLEN];
360	}				 r_value;
361	TAILQ_HEAD(optlist, opt)	 r_options;
362};
363
364enum path_flags {
365	F_ALIAS = 0x1,
366	F_VIRTUAL = 0x2,
367	F_EXPANDED = 0x4,
368	F_NOFORWARD = 0x8,
369	F_FORWARDED = 0x10,
370	F_ACCOUNT = 0x20,
371};
372
373struct path {
374	TAILQ_ENTRY(path)		 entry;
375	struct rule			 rule;
376	enum path_flags			 flags;
377	u_int8_t			 forwardcnt;
378	char				 user[MAX_LOCALPART_SIZE];
379	char				 domain[MAX_DOMAINPART_SIZE];
380	char				 pw_name[MAXLOGNAME];
381	union path_data {
382		char filename[MAXPATHLEN];
383		char filter[MAXPATHLEN];
384	}				 u;
385};
386
387enum alias_type {
388	ALIAS_USERNAME,
389	ALIAS_FILENAME,
390	ALIAS_FILTER,
391	ALIAS_INCLUDE,
392	ALIAS_ADDRESS,
393	ALIAS_TEXT
394};
395
396struct alias {
397	TAILQ_ENTRY(alias)		entry;
398	enum alias_type			 type;
399	union alias_data {
400		char username[MAXLOGNAME];
401		char filename[MAXPATHLEN];
402		char filter[MAXPATHLEN];
403		char text[MAX_MAKEMAP_SIZE];
404		struct path path;
405	}                                   u;
406};
407TAILQ_HEAD(aliaseslist, alias);
408
409enum message_type {
410	T_MDA_MESSAGE		= 0x1,
411	T_MTA_MESSAGE		= 0x2,
412	T_DAEMON_MESSAGE	= 0x4
413};
414
415enum message_status {
416	S_MESSAGE_LOCKFAILURE	= 0x1,
417	S_MESSAGE_PERMFAILURE	= 0x2,
418	S_MESSAGE_TEMPFAILURE	= 0x4,
419	S_MESSAGE_REJECTED	= 0x8,
420	S_MESSAGE_ACCEPTED	= 0x10,
421	S_MESSAGE_RETRY		= 0x20,
422	S_MESSAGE_EDNS		= 0x40,
423	S_MESSAGE_ECONNECT	= 0x80
424};
425
426enum message_flags {
427	F_MESSAGE_RESOLVED	= 0x1,
428	F_MESSAGE_SCHEDULED	= 0x2,
429	F_MESSAGE_PROCESSING	= 0x4,
430	F_MESSAGE_AUTHENTICATED	= 0x8,
431	F_MESSAGE_ENQUEUED	= 0x10,
432	F_MESSAGE_FORCESCHEDULE	= 0x20
433};
434
435struct message {
436	TAILQ_ENTRY(message)		 entry;
437
438	enum message_type		 type;
439
440	u_int64_t			 id;
441	u_int64_t			 session_id;
442	u_int64_t			 batch_id;
443
444	char				 message_id[MAX_ID_SIZE];
445	char				 message_uid[MAX_ID_SIZE];
446
447	char				 session_helo[MAXHOSTNAMELEN];
448	char				 session_hostname[MAXHOSTNAMELEN];
449	char				 session_errorline[MAX_LINE_SIZE];
450	struct sockaddr_storage		 session_ss;
451	struct path			 session_rcpt;
452
453	struct path			 sender;
454	struct path			 recipient;
455
456	time_t				 creation;
457	time_t				 lasttry;
458	u_int8_t			 retry;
459	enum message_flags		 flags;
460	enum message_status		 status;
461
462	FILE				*datafp;
463	int				 mboxfd;
464	int				 messagefd;
465};
466
467enum batch_status {
468	S_BATCH_PERMFAILURE	= 0x1,
469	S_BATCH_TEMPFAILURE	= 0x2,
470	S_BATCH_REJECTED	= 0x4,
471	S_BATCH_ACCEPTED	= 0x8,
472	S_BATCH_RETRY		= 0x10,
473	S_BATCH_EDNS		= 0x20,
474	S_BATCH_ECONNECT	= 0x40
475};
476
477enum batch_type {
478	T_MDA_BATCH		= 0x1,
479	T_MTA_BATCH		= 0x2,
480	T_DAEMON_BATCH		= 0x4
481};
482
483enum batch_flags {
484	F_BATCH_COMPLETE	= 0x1,
485	F_BATCH_RESOLVED	= 0x2,
486	F_BATCH_SCHEDULED	= 0x4,
487	F_BATCH_EXPIRED		= 0x8,
488};
489
490struct mdaproc {
491	SPLAY_ENTRY(mdaproc)	mdaproc_nodes;
492
493	pid_t			pid;
494};
495
496struct batch {
497	SPLAY_ENTRY(batch)	 b_nodes;
498
499	u_int64_t		 id;
500	u_int64_t		 session_id;
501	enum batch_type		 type;
502	enum batch_flags	 flags;
503
504	struct rule			 rule;
505
506	struct smtpd			*env;
507
508	char				 message_id[MAX_ID_SIZE];
509	char				 hostname[MAXHOSTNAMELEN];
510	char				 errorline[MAX_LINE_SIZE];
511
512	char				 session_helo[MAXHOSTNAMELEN];
513	char				 session_hostname[MAXHOSTNAMELEN];
514	struct sockaddr_storage		 session_ss;
515
516	int8_t				 getaddrinfo_error;
517	struct mxhost			 mxarray[MXARRAYSIZE*2];
518	u_int8_t			 mx_cnt;
519	u_int8_t			 mx_off;
520
521	time_t				 creation;
522	time_t				 lasttry;
523	u_int8_t			 retry;
524
525	struct session			*sessionp;
526
527	struct message			message;
528	struct message			*messagep;
529	FILE				*messagefp;
530	TAILQ_HEAD(messagelist, message) messages;
531
532	enum batch_status		status;
533};
534
535enum session_state {
536	S_INIT = 0,
537	S_GREETED,
538	S_TLS,
539	S_AUTH_INIT,
540	S_AUTH_USERNAME,
541	S_AUTH_PASSWORD,
542	S_AUTH_FINALIZE,
543	S_HELO,
544	S_MAILREQUEST,
545	S_MAIL,
546	S_RCPTREQUEST,
547	S_RCPT,
548	S_DATAREQUEST,
549	S_DATA,
550	S_DATACONTENT,
551	S_DONE,
552	S_QUIT
553};
554#define	IS_AUTH(x)	((x) == S_AUTH_INIT || (x) == S_AUTH_USERNAME || (x) == S_AUTH_PASSWORD || (x) == S_AUTH_FINALIZE)
555
556struct ssl {
557	SPLAY_ENTRY(ssl)	 ssl_nodes;
558	char			 ssl_name[PATH_MAX];
559	char			*ssl_cert;
560	off_t			 ssl_cert_len;
561	char			*ssl_key;
562	off_t			 ssl_key_len;
563};
564
565struct listener {
566	u_int8_t		 flags;
567	int			 fd;
568	struct sockaddr_storage	 ss;
569	in_port_t		 port;
570	struct timeval		 timeout;
571	struct event		 ev;
572	struct smtpd		*env;
573	char			 ssl_cert_name[PATH_MAX];
574	struct ssl		*ssl;
575	void			*ssl_ctx;
576	TAILQ_ENTRY(listener)	 entry;
577};
578
579struct session_auth_req {
580	u_int64_t	session_id;
581	char		buffer[MAX_LINE_SIZE];
582};
583
584struct session_auth_reply {
585	u_int64_t	session_id;
586	u_int8_t	value;
587};
588
589enum session_flags {
590	F_EHLO		= 0x1,
591	F_QUIT		= 0x2,
592	F_8BITMIME	= 0x4,
593	F_SECURE	= 0x8,
594	F_AUTHENTICATED	= 0x10,
595	F_PEERHASTLS	= 0x20,
596	F_EVLOCKED	= 0x40
597};
598
599struct session {
600	SPLAY_ENTRY(session)		 s_nodes;
601	u_int64_t			 s_id;
602
603	enum session_flags		 s_flags;
604	enum session_state		 s_state;
605	time_t				 s_tm;
606	int				 s_fd;
607	struct sockaddr_storage		 s_ss;
608	char				 s_hostname[MAXHOSTNAMELEN];
609	struct event			 s_ev;
610	struct bufferevent		*s_bev;
611	struct listener			*s_l;
612	struct smtpd			*s_env;
613	void				*s_ssl;
614	u_char				*s_buf;
615	int				 s_buflen;
616	struct timeval			 s_tv;
617	struct message			 s_msg;
618	u_int32_t			 rcptcount;
619
620	struct session_auth_req		 s_auth;
621
622	struct mxhost			*mxarray;
623	u_int8_t			 mx_cnt;
624	u_int8_t			 mx_off;
625
626	struct batch			*batch;
627
628};
629
630struct smtpd {
631#define SMTPD_OPT_VERBOSE			 0x00000001
632#define SMTPD_OPT_NOACTION			 0x00000002
633	u_int32_t				 sc_opts;
634#define SMTPD_CONFIGURING			 0x00000001
635#define SMTPD_EXITING				 0x00000002
636#define SMTPD_MDA_PAUSED		       	 0x00000004
637#define SMTPD_MTA_PAUSED		       	 0x00000008
638#define SMTPD_SMTP_PAUSED		       	 0x00000010
639	u_int32_t				 sc_flags;
640	struct timeval				 sc_qintval;
641	u_int32_t				 sc_maxconn;
642	struct event				 sc_ev;
643	int					 *sc_pipes[PROC_COUNT]
644						     [PROC_COUNT];
645	struct imsgbuf				*sc_ibufs[PROC_COUNT];
646	int					 sc_instances[PROC_COUNT];
647	int					 sc_instance;
648	struct passwd				*sc_pw;
649	char					 sc_hostname[MAXHOSTNAMELEN];
650	TAILQ_HEAD(listenerlist, listener)	 sc_listeners;
651	TAILQ_HEAD(maplist, map)		*sc_maps;
652	TAILQ_HEAD(rulelist, rule)		*sc_rules;
653	SPLAY_HEAD(sessiontree, session)	 sc_sessions;
654	SPLAY_HEAD(msgtree, message)		 sc_messages;
655	SPLAY_HEAD(ssltree, ssl)		 sc_ssl;
656
657	SPLAY_HEAD(batchtree, batch)		batch_queue;
658	SPLAY_HEAD(mdaproctree, mdaproc)	mdaproc_queue;
659	SPLAY_HEAD(lkatree, lkasession)		lka_sessions;
660};
661
662struct s_parent {
663	time_t		start;
664};
665
666struct s_queue {
667	size_t		inserts_local;
668	size_t		inserts_remote;
669};
670
671struct s_runner {
672	size_t		active;
673};
674
675struct s_smtp {
676	size_t		sessions;
677	size_t		sessions_active;
678
679	size_t		ssmtp;
680	size_t		ssmtp_active;
681
682	size_t		starttls;
683	size_t		starttls_active;
684
685	size_t		aborted;
686};
687
688struct stats {
689	int			fd;
690	union u_stats {
691		struct s_parent	parent;
692		struct s_queue	queue;
693		struct s_runner	runner;
694		struct s_smtp	smtp;
695	}			u;
696};
697
698struct sched {
699	int			fd;
700	char			mid[MAX_ID_SIZE];
701	int			ret;
702};
703
704struct submit_status {
705	u_int64_t			 id;
706	int				 code;
707	union submit_path {
708		struct path		 path;
709		char			 msgid[MAX_ID_SIZE];
710		char			 errormsg[MAX_LINE_SIZE];
711	}				 u;
712	enum message_flags		 flags;
713	struct sockaddr_storage		 ss;
714	struct message			 msg;
715};
716
717struct message_recipient {
718	u_int64_t			 id;
719	struct sockaddr_storage		 ss;
720	enum message_flags		 flags;
721	struct path			 path;
722	struct message			 msg;
723};
724
725struct forward_req {
726	u_int64_t			 id;
727	char				 pw_name[MAXLOGNAME];
728};
729
730enum lkasession_flags {
731	F_ERROR		= 0x1
732};
733
734struct lkasession {
735	SPLAY_ENTRY(lkasession)		 nodes;
736	u_int64_t			 id;
737
738	struct path			 path;
739	struct aliaseslist		 aliaseslist;
740	u_int8_t			 iterations;
741	u_int32_t			 pending;
742	enum lkasession_flags		 flags;
743	struct message			 message;
744	struct submit_status		 ss;
745};
746
747/* aliases.c */
748int aliases_exist(struct smtpd *, char *);
749int aliases_get(struct smtpd *, struct aliaseslist *, char *);
750int aliases_virtual_exist(struct smtpd *, struct path *);
751int aliases_virtual_get(struct smtpd *, struct aliaseslist *, struct path *);
752int alias_parse(struct alias *, char *);
753
754
755/* log.c */
756void		log_init(int);
757void		log_warn(const char *, ...)
758    __attribute__ ((format (printf, 1, 2)));
759void		log_warnx(const char *, ...)
760    __attribute__ ((format (printf, 1, 2)));
761void		log_info(const char *, ...)
762    __attribute__ ((format (printf, 1, 2)));
763void		log_debug(const char *, ...)
764    __attribute__ ((format (printf, 1, 2)));
765__dead void	fatal(const char *);
766__dead void	fatalx(const char *);
767
768
769/* buffer.c */
770struct buf	*buf_open(size_t);
771struct buf	*buf_dynamic(size_t, size_t);
772int		 buf_add(struct buf *, void *, size_t);
773void		*buf_reserve(struct buf *, size_t);
774int		 buf_close(struct msgbuf *, struct buf *);
775void		 buf_free(struct buf *);
776void		 msgbuf_init(struct msgbuf *);
777void		 msgbuf_clear(struct msgbuf *);
778int		 msgbuf_write(struct msgbuf *);
779
780
781/* dns.c */
782int		 getmxbyname(char *, char ***);
783
784
785/* forward.c */
786int forwards_get(int, struct aliaseslist *);
787
788
789/* imsg.c */
790void	 imsg_init(struct imsgbuf *, int, void (*)(int, short, void *));
791ssize_t	 imsg_read(struct imsgbuf *);
792ssize_t	 imsg_get(struct imsgbuf *, struct imsg *);
793int	 imsg_compose(struct imsgbuf *, enum imsg_type, u_int32_t, pid_t,
794	    int, void *, u_int16_t);
795int	 imsg_composev(struct imsgbuf *, enum imsg_type, u_int32_t,
796	    pid_t, int, const struct iovec *, int);
797int	 imsg_compose_fds(struct imsgbuf *, enum imsg_type, u_int32_t, pid_t,
798	    void *, u_int16_t, int, ...);
799struct buf *imsg_create(struct imsgbuf *, enum imsg_type, u_int32_t, pid_t,
800	    u_int16_t);
801int	 imsg_add(struct buf *, void *, u_int16_t);
802int	 imsg_append(struct imsgbuf *, struct buf *);
803int	 imsg_close(struct imsgbuf *, struct buf *);
804void	 imsg_free(struct imsg *);
805void	 imsg_event_add(struct imsgbuf *); /* needs to be provided externally */
806int	 imsg_get_fd(struct imsgbuf *, struct imsg *);
807int	 imsg_flush(struct imsgbuf *);
808void	 imsg_clear(struct imsgbuf *);
809
810/* lka.c */
811pid_t		 lka(struct smtpd *);
812int		 lkasession_cmp(struct lkasession *, struct lkasession *);
813SPLAY_PROTOTYPE(lkatree, lkasession, nodes, lkasession_cmp);
814
815/* mfa.c */
816pid_t		 mfa(struct smtpd *);
817int		 msg_cmp(struct message *, struct message *);
818
819/* queue.c */
820pid_t		 queue(struct smtpd *);
821u_int64_t	 queue_generate_id(void);
822int		 queue_remove_batch_message(struct smtpd *, struct batch *,
823 		     struct message *);
824int		 queue_load_envelope(struct message *, char *);
825int		 queue_update_envelope(struct message *);
826int		 queue_remove_envelope(struct message *);
827int		 batch_cmp(struct batch *, struct batch *);
828struct batch    *batch_by_id(struct smtpd *, u_int64_t);
829struct message	*message_by_id(struct smtpd *, struct batch *, u_int64_t);
830u_int16_t	 queue_hash(char *);
831
832/* queue_shared.c */
833int		 queue_create_layout_message(char *, char *);
834void		 queue_delete_layout_message(char *, char *);
835int		 queue_record_layout_envelope(char *, struct message *);
836int		 queue_remove_layout_envelope(char *, struct message *);
837int		 queue_commit_layout_message(char *, struct message *);
838int		 queue_open_layout_messagefile(char *, struct message *);
839int		 enqueue_create_layout(char *);
840void		 enqueue_delete_message(char *);
841int		 enqueue_record_envelope(struct message *);
842int		 enqueue_remove_envelope(struct message *);
843int		 enqueue_commit_message(struct message *);
844int		 enqueue_open_messagefile(struct message *);
845int		 queue_create_incoming_layout(char *);
846void		 queue_delete_incoming_message(char *);
847int		 queue_record_incoming_envelope(struct message *);
848int		 queue_remove_incoming_envelope(struct message *);
849int		 queue_commit_incoming_message(struct message *);
850int		 queue_open_incoming_message_file(struct message *);
851int		 queue_open_message_file(char *msgid);
852void		 queue_message_update(struct message *);
853void		 queue_delete_message(char *);
854struct qwalk	*qwalk_new(char *);
855int		 qwalk(struct qwalk *, char *);
856void		 qwalk_close(struct qwalk *);
857void		 show_queue(char *, int);
858
859u_int16_t	queue_hash(char *);
860
861/* map.c */
862char		*map_dblookup(struct smtpd *, char *, char *);
863
864/* mda.c */
865pid_t		 mda(struct smtpd *);
866int		 mdaproc_cmp(struct mdaproc *, struct mdaproc *);
867SPLAY_PROTOTYPE(mdaproctree, mdaproc, mdaproc_nodes, mdaproc_cmp);
868
869/* mta.c */
870pid_t		 mta(struct smtpd *);
871
872/* control.c */
873pid_t		 control(struct smtpd *);
874void		 session_socket_blockmode(int, enum blockmodes);
875
876/* runner.c */
877pid_t		 runner(struct smtpd *);
878SPLAY_PROTOTYPE(batchtree, batch, b_nodes, batch_cmp);
879
880
881/* smtp.c */
882pid_t		 smtp(struct smtpd *);
883void		 smtp_listener_setup(struct smtpd *, struct listener *);
884
885/* smtp_session.c */
886void		 session_init(struct listener *, struct session *);
887int		 session_cmp(struct session *, struct session *);
888void		 session_pickup(struct session *, struct submit_status *);
889void		 session_destroy(struct session *);
890void		 session_respond(struct session *, char *, ...)
891		    __attribute__ ((format (printf, 2, 3)));
892
893SPLAY_PROTOTYPE(sessiontree, session, s_nodes, session_cmp);
894
895/* store.c */
896int store_write_header(struct batch *, struct message *, FILE *, int);
897int store_write_message(struct batch *, struct message *);
898int store_write_daemon(struct batch *, struct message *);
899int store_message(struct batch *, struct message *,
900    int (*)(struct batch *, struct message *));
901
902/* config.c */
903#define		 PURGE_LISTENERS	0x01
904#define		 PURGE_MAPS		0x02
905#define		 PURGE_RULES		0x04
906#define		 PURGE_SSL		0x08
907#define		 PURGE_EVERYTHING	0xff
908void		 purge_config(struct smtpd *, u_int8_t);
909void		 unconfigure(struct smtpd *);
910void		 configure(struct smtpd *);
911void		 init_peers(struct smtpd *);
912void		 config_pipes(struct smtpd *, struct peer *, u_int);
913void		 config_peers(struct smtpd *, struct peer *, u_int);
914
915/* parse.y */
916int		 parse_config(struct smtpd *, const char *, int);
917int		 cmdline_symset(char *);
918
919/* ssl.c */
920void	 ssl_init(void);
921void	 ssl_transaction(struct session *);
922
923void	 ssl_session_init(struct session *);
924void	 ssl_session_destroy(struct session *);
925int	 ssl_load_certfile(struct smtpd *, const char *);
926void	 ssl_setup(struct smtpd *, struct listener *);
927int	 ssl_cmp(struct ssl *, struct ssl *);
928SPLAY_PROTOTYPE(ssltree, ssl, ssl_nodes, ssl_cmp);
929
930/* ssl_privsep.c */
931int	 ssl_ctx_use_private_key(void *, char *, off_t);
932int	 ssl_ctx_use_certificate_chain(void *, char *, off_t);
933
934/* smtpd.c */
935struct map	*map_find(struct smtpd *, objid_t);
936struct map	*map_findbyname(struct smtpd *, const char *);
937
938/* util.c */
939int		 bsnprintf(char *, size_t, const char *, ...)
940    __attribute__ ((format (printf, 3, 4)));
941int		 safe_fclose(FILE *);
942struct passwd 	*safe_getpwnam(const char *);
943struct passwd 	*safe_getpwuid(uid_t);
944int		 hostname_match(char *, char *);
945int		 recipient_to_path(struct path *, char *);
946int		 valid_localpart(char *);
947int		 valid_domainpart(char *);
948char		*ss_to_text(struct sockaddr_storage *);
949int		 valid_message_id(char *);
950int		 valid_message_uid(char *);
951int		 secure_file(int, char *, struct passwd *);
952