xref: /illumos-gate/usr/src/cmd/sendmail/src/daemon.c (revision 91b4b539)
1 /*
2  * Copyright (c) 1998-2007, 2009 Sendmail, Inc. and its suppliers.
3  *	All rights reserved.
4  * Copyright (c) 1983, 1995-1997 Eric P. Allman.  All rights reserved.
5  * Copyright (c) 1988, 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * By using this file, you agree to the terms and conditions set
9  * forth in the LICENSE file which can be found at the top level of
10  * the sendmail distribution.
11  *
12  */
13 
14 #include <sendmail.h>
15 #include "map.h"
16 
17 SM_RCSID("@(#)$Id: daemon.c,v 8.683 2009/12/18 01:12:40 ca Exp $")
18 
19 #if defined(SOCK_STREAM) || defined(__GNU_LIBRARY__)
20 # define USE_SOCK_STREAM	1
21 #endif /* defined(SOCK_STREAM) || defined(__GNU_LIBRARY__) */
22 
23 #if defined(USE_SOCK_STREAM)
24 # if NETINET || NETINET6
25 #  include <arpa/inet.h>
26 # endif /* NETINET || NETINET6 */
27 # if NAMED_BIND
28 #  ifndef NO_DATA
29 #   define NO_DATA	NO_ADDRESS
30 #  endif /* ! NO_DATA */
31 # endif /* NAMED_BIND */
32 #endif /* defined(USE_SOCK_STREAM) */
33 
34 #if STARTTLS
35 #  include <openssl/rand.h>
36 #endif /* STARTTLS */
37 
38 #include <sm/time.h>
39 
40 #if IP_SRCROUTE && NETINET
41 # include <netinet/in_systm.h>
42 # include <netinet/ip.h>
43 # if HAS_IN_H
44 #  include <netinet/in.h>
45 #  ifndef IPOPTION
46 #   define IPOPTION	ip_opts
47 #   define IP_LIST	ip_opts
48 #   define IP_DST	ip_dst
49 #  endif /* ! IPOPTION */
50 # else /* HAS_IN_H */
51 #  include <netinet/ip_var.h>
52 #  ifndef IPOPTION
53 #   define IPOPTION	ipoption
54 #   define IP_LIST	ipopt_list
55 #   define IP_DST	ipopt_dst
56 #  endif /* ! IPOPTION */
57 # endif /* HAS_IN_H */
58 #endif /* IP_SRCROUTE && NETINET */
59 
60 #include <sm/fdset.h>
61 
62 #define DAEMON_C 1
63 #include <daemon.h>
64 
65 static void		connecttimeout __P((int));
66 static int		opendaemonsocket __P((DAEMON_T *, bool));
67 static unsigned short	setupdaemon __P((SOCKADDR *));
68 static void		getrequests_checkdiskspace __P((ENVELOPE *e));
69 static void		setsockaddroptions __P((char *, DAEMON_T *));
70 static void		printdaemonflags __P((DAEMON_T *));
71 static int		addr_family __P((char *));
72 static int		addrcmp __P((struct hostent *, char *, SOCKADDR *));
73 static void		authtimeout __P((int));
74 
75 /*
76 **  DAEMON.C -- routines to use when running as a daemon.
77 **
78 **	This entire file is highly dependent on the 4.2 BSD
79 **	interprocess communication primitives.  No attempt has
80 **	been made to make this file portable to Version 7,
81 **	Version 6, MPX files, etc.  If you should try such a
82 **	thing yourself, I recommend chucking the entire file
83 **	and starting from scratch.  Basic semantics are:
84 **
85 **	getrequests(e)
86 **		Opens a port and initiates a connection.
87 **		Returns in a child.  Must set InChannel and
88 **		OutChannel appropriately.
89 **	clrdaemon()
90 **		Close any open files associated with getting
91 **		the connection; this is used when running the queue,
92 **		etc., to avoid having extra file descriptors during
93 **		the queue run and to avoid confusing the network
94 **		code (if it cares).
95 **	makeconnection(host, port, mci, e, enough)
96 **		Make a connection to the named host on the given
97 **		port. Returns zero on success, else an exit status
98 **		describing the error.
99 **	host_map_lookup(map, hbuf, avp, pstat)
100 **		Convert the entry in hbuf into a canonical form.
101 */
102 
103 static int	NDaemons = 0;			/* actual number of daemons */
104 
105 static time_t	NextDiskSpaceCheck = 0;
106 
107 /*
108 **  GETREQUESTS -- open mail IPC port and get requests.
109 **
110 **	Parameters:
111 **		e -- the current envelope.
112 **
113 **	Returns:
114 **		pointer to flags.
115 **
116 **	Side Effects:
117 **		Waits until some interesting activity occurs.  When
118 **		it does, a child is created to process it, and the
119 **		parent waits for completion.  Return from this
120 **		routine is always in the child.  The file pointers
121 **		"InChannel" and "OutChannel" should be set to point
122 **		to the communication channel.
123 **		May restart persistent queue runners if they have ended
124 **		for some reason.
125 */
126 
127 BITMAP256 *
getrequests(e)128 getrequests(e)
129 	ENVELOPE *e;
130 {
131 	int t;
132 	int idx, curdaemon = -1;
133 	int i, olddaemon = 0;
134 #if XDEBUG
135 	bool j_has_dot;
136 #endif /* XDEBUG */
137 	char status[MAXLINE];
138 	SOCKADDR sa;
139 	SOCKADDR_LEN_T len = sizeof(sa);
140 #if _FFR_QUEUE_RUN_PARANOIA
141 	time_t lastrun;
142 #endif /* _FFR_QUEUE_RUN_PARANOIA */
143 # if NETUNIX
144 	extern int ControlSocket;
145 # endif /* NETUNIX */
146 	extern ENVELOPE BlankEnvelope;
147 
148 
149 	/* initialize data for function that generates queue ids */
150 	init_qid_alg();
151 	for (idx = 0; idx < NDaemons; idx++)
152 	{
153 		Daemons[idx].d_port = setupdaemon(&(Daemons[idx].d_addr));
154 		Daemons[idx].d_firsttime = true;
155 		Daemons[idx].d_refuse_connections_until = (time_t) 0;
156 	}
157 
158 	/*
159 	**  Try to actually open the connection.
160 	*/
161 
162 	if (tTd(15, 1))
163 	{
164 		for (idx = 0; idx < NDaemons; idx++)
165 		{
166 			sm_dprintf("getrequests: daemon %s: port %d\n",
167 				   Daemons[idx].d_name,
168 				   ntohs(Daemons[idx].d_port));
169 		}
170 	}
171 
172 	/* get a socket for the SMTP connection */
173 	for (idx = 0; idx < NDaemons; idx++)
174 		Daemons[idx].d_socksize = opendaemonsocket(&Daemons[idx], true);
175 
176 	if (opencontrolsocket() < 0)
177 		sm_syslog(LOG_WARNING, NOQID,
178 			  "daemon could not open control socket %s: %s",
179 			  ControlSocketName, sm_errstring(errno));
180 
181 	/* If there are any queue runners released reapchild() co-ord's */
182 	(void) sm_signal(SIGCHLD, reapchild);
183 
184 	/* write the pid to file, command line args to syslog */
185 	log_sendmail_pid(e);
186 
187 #if XDEBUG
188 	{
189 		char jbuf[MAXHOSTNAMELEN];
190 
191 		expand("\201j", jbuf, sizeof(jbuf), e);
192 		j_has_dot = strchr(jbuf, '.') != NULL;
193 	}
194 #endif /* XDEBUG */
195 
196 	/* Add parent process as first item */
197 	proc_list_add(CurrentPid, "Sendmail daemon", PROC_DAEMON, 0, -1, NULL);
198 
199 	if (tTd(15, 1))
200 	{
201 		for (idx = 0; idx < NDaemons; idx++)
202 			sm_dprintf("getrequests: daemon %s: socket %d\n",
203 				Daemons[idx].d_name,
204 				Daemons[idx].d_socket);
205 	}
206 
207 	for (;;)
208 	{
209 		register pid_t pid;
210 		auto SOCKADDR_LEN_T lotherend;
211 		bool timedout = false;
212 		bool control = false;
213 		int save_errno;
214 		int pipefd[2];
215 		time_t now;
216 #if STARTTLS
217 		long seed;
218 #endif /* STARTTLS */
219 
220 		/* see if we are rejecting connections */
221 		(void) sm_blocksignal(SIGALRM);
222 		CHECK_RESTART;
223 
224 		for (idx = 0; idx < NDaemons; idx++)
225 		{
226 			/*
227 			**  XXX do this call outside the loop?
228 			**	no: refuse_connections may sleep().
229 			*/
230 
231 			now = curtime();
232 			if (now < Daemons[idx].d_refuse_connections_until)
233 				continue;
234 			if (bitnset(D_DISABLE, Daemons[idx].d_flags))
235 				continue;
236 			if (refuseconnections(e, idx, curdaemon == idx))
237 			{
238 				if (Daemons[idx].d_socket >= 0)
239 				{
240 					/* close socket so peer fails quickly */
241 					(void) close(Daemons[idx].d_socket);
242 					Daemons[idx].d_socket = -1;
243 				}
244 
245 				/* refuse connections for next 15 seconds */
246 				Daemons[idx].d_refuse_connections_until = now + 15;
247 			}
248 			else if (Daemons[idx].d_socket < 0 ||
249 				 Daemons[idx].d_firsttime)
250 			{
251 				if (!Daemons[idx].d_firsttime && LogLevel > 8)
252 					sm_syslog(LOG_INFO, NOQID,
253 						"accepting connections again for daemon %s",
254 						Daemons[idx].d_name);
255 
256 				/* arrange to (re)open the socket if needed */
257 				(void) opendaemonsocket(&Daemons[idx], false);
258 				Daemons[idx].d_firsttime = false;
259 			}
260 		}
261 
262 		/* May have been sleeping above, check again */
263 		CHECK_RESTART;
264 
265 		getrequests_checkdiskspace(e);
266 
267 #if XDEBUG
268 		/* check for disaster */
269 		{
270 			char jbuf[MAXHOSTNAMELEN];
271 
272 			expand("\201j", jbuf, sizeof(jbuf), e);
273 			if (!wordinclass(jbuf, 'w'))
274 			{
275 				dumpstate("daemon lost $j");
276 				sm_syslog(LOG_ALERT, NOQID,
277 					  "daemon process doesn't have $j in $=w; see syslog");
278 				abort();
279 			}
280 			else if (j_has_dot && strchr(jbuf, '.') == NULL)
281 			{
282 				dumpstate("daemon $j lost dot");
283 				sm_syslog(LOG_ALERT, NOQID,
284 					  "daemon process $j lost dot; see syslog");
285 				abort();
286 			}
287 		}
288 #endif /* XDEBUG */
289 
290 #if 0
291 		/*
292 		**  Andrew Sun <asun@ieps-sun.ml.com> claims that this will
293 		**  fix the SVr4 problem.  But it seems to have gone away,
294 		**  so is it worth doing this?
295 		*/
296 
297 		if (DaemonSocket >= 0 &&
298 		    SetNonBlocking(DaemonSocket, false) < 0)
299 			log an error here;
300 #endif /* 0 */
301 		(void) sm_releasesignal(SIGALRM);
302 
303 		for (;;)
304 		{
305 			bool setproc = false;
306 			int highest = -1;
307 			fd_set readfds;
308 			struct timeval timeout;
309 
310 			CHECK_RESTART;
311 			FD_ZERO(&readfds);
312 			for (idx = 0; idx < NDaemons; idx++)
313 			{
314 				/* wait for a connection */
315 				if (Daemons[idx].d_socket >= 0)
316 				{
317 					if (!setproc &&
318 					    !bitnset(D_ETRNONLY,
319 						     Daemons[idx].d_flags))
320 					{
321 						sm_setproctitle(true, e,
322 								"accepting connections");
323 						setproc = true;
324 					}
325 					if (Daemons[idx].d_socket > highest)
326 						highest = Daemons[idx].d_socket;
327 					SM_FD_SET(Daemons[idx].d_socket,
328 						  &readfds);
329 				}
330 			}
331 
332 #if NETUNIX
333 			if (ControlSocket >= 0)
334 			{
335 				if (ControlSocket > highest)
336 					highest = ControlSocket;
337 				SM_FD_SET(ControlSocket, &readfds);
338 			}
339 #endif /* NETUNIX */
340 
341 			timeout.tv_sec = 5;
342 			timeout.tv_usec = 0;
343 
344 			t = select(highest + 1, FDSET_CAST &readfds,
345 				   NULL, NULL, &timeout);
346 
347 			/* Did someone signal while waiting? */
348 			CHECK_RESTART;
349 
350 			curdaemon = -1;
351 			if (doqueuerun())
352 			{
353 				(void) runqueue(true, false, false, false);
354 #if _FFR_QUEUE_RUN_PARANOIA
355 				lastrun = now;
356 #endif /* _FFR_QUEUE_RUN_PARANOIA */
357 			}
358 #if _FFR_QUEUE_RUN_PARANOIA
359 			else if (CheckQueueRunners > 0 && QueueIntvl > 0 &&
360 				 lastrun + QueueIntvl + CheckQueueRunners < now)
361 			{
362 
363 				/*
364 				**  set lastrun unconditionally to avoid
365 				**  calling checkqueuerunner() all the time.
366 				**  That's also why we currently ignore the
367 				**  result of the function call.
368 				*/
369 
370 				(void) checkqueuerunner();
371 				lastrun = now;
372 			}
373 #endif /* _FFR_QUEUE_RUN_PARANOIA */
374 
375 			if (t <= 0)
376 			{
377 				timedout = true;
378 				break;
379 			}
380 
381 			control = false;
382 			errno = 0;
383 
384 			/* look "round-robin" for an active socket */
385 			if ((idx = olddaemon + 1) >= NDaemons)
386 				idx = 0;
387 			for (i = 0; i < NDaemons; i++)
388 			{
389 				if (Daemons[idx].d_socket >= 0 &&
390 				    SM_FD_ISSET(Daemons[idx].d_socket,
391 						&readfds))
392 				{
393 					lotherend = Daemons[idx].d_socksize;
394 					memset(&RealHostAddr, '\0',
395 					       sizeof(RealHostAddr));
396 					t = accept(Daemons[idx].d_socket,
397 						   (struct sockaddr *)&RealHostAddr,
398 						   &lotherend);
399 
400 					/*
401 					**  If remote side closes before
402 					**  accept() finishes, sockaddr
403 					**  might not be fully filled in.
404 					*/
405 
406 					if (t >= 0 &&
407 					    (lotherend == 0 ||
408 # ifdef BSD4_4_SOCKADDR
409 					     RealHostAddr.sa.sa_len == 0 ||
410 # endif /* BSD4_4_SOCKADDR */
411 					     RealHostAddr.sa.sa_family != Daemons[idx].d_addr.sa.sa_family))
412 					{
413 						(void) close(t);
414 						t = -1;
415 						errno = EINVAL;
416 					}
417 					olddaemon = curdaemon = idx;
418 					break;
419 				}
420 				if (++idx >= NDaemons)
421 					idx = 0;
422 			}
423 #if NETUNIX
424 			if (curdaemon == -1 && ControlSocket >= 0 &&
425 			    SM_FD_ISSET(ControlSocket, &readfds))
426 			{
427 				struct sockaddr_un sa_un;
428 
429 				lotherend = sizeof(sa_un);
430 				memset(&sa_un, '\0', sizeof(sa_un));
431 				t = accept(ControlSocket,
432 					   (struct sockaddr *)&sa_un,
433 					   &lotherend);
434 
435 				/*
436 				**  If remote side closes before
437 				**  accept() finishes, sockaddr
438 				**  might not be fully filled in.
439 				*/
440 
441 				if (t >= 0 &&
442 				    (lotherend == 0 ||
443 # ifdef BSD4_4_SOCKADDR
444 				     sa_un.sun_len == 0 ||
445 # endif /* BSD4_4_SOCKADDR */
446 				     sa_un.sun_family != AF_UNIX))
447 				{
448 					(void) close(t);
449 					t = -1;
450 					errno = EINVAL;
451 				}
452 				if (t >= 0)
453 					control = true;
454 			}
455 #else /* NETUNIX */
456 			if (curdaemon == -1)
457 			{
458 				/* No daemon to service */
459 				continue;
460 			}
461 #endif /* NETUNIX */
462 			if (t >= 0 || errno != EINTR)
463 				break;
464 		}
465 		if (timedout)
466 		{
467 			timedout = false;
468 			continue;
469 		}
470 		save_errno = errno;
471 		(void) sm_blocksignal(SIGALRM);
472 		if (t < 0)
473 		{
474 			errno = save_errno;
475 
476 			/* let's ignore these temporary errors */
477 			if (save_errno == EINTR
478 #ifdef EAGAIN
479 			    || save_errno == EAGAIN
480 #endif /* EAGAIN */
481 #ifdef ECONNABORTED
482 			    || save_errno == ECONNABORTED
483 #endif /* ECONNABORTED */
484 #ifdef EWOULDBLOCK
485 			    || save_errno == EWOULDBLOCK
486 #endif /* EWOULDBLOCK */
487 			   )
488 				continue;
489 
490 			syserr("getrequests: accept");
491 
492 			if (curdaemon >= 0)
493 			{
494 				/* arrange to re-open socket next time around */
495 				(void) close(Daemons[curdaemon].d_socket);
496 				Daemons[curdaemon].d_socket = -1;
497 #if SO_REUSEADDR_IS_BROKEN
498 				/*
499 				**  Give time for bound socket to be released.
500 				**  This creates a denial-of-service if you can
501 				**  force accept() to fail on affected systems.
502 				*/
503 
504 				Daemons[curdaemon].d_refuse_connections_until =
505 					curtime() + 15;
506 #endif /* SO_REUSEADDR_IS_BROKEN */
507 			}
508 			continue;
509 		}
510 
511 		if (!control)
512 		{
513 			/* set some daemon related macros */
514 			switch (Daemons[curdaemon].d_addr.sa.sa_family)
515 			{
516 			  case AF_UNSPEC:
517 				macdefine(&BlankEnvelope.e_macro, A_PERM,
518 					macid("{daemon_family}"), "unspec");
519 				break;
520 #if _FFR_DAEMON_NETUNIX
521 # if NETUNIX
522 			  case AF_UNIX:
523 				macdefine(&BlankEnvelope.e_macro, A_PERM,
524 					macid("{daemon_family}"), "local");
525 				break;
526 # endif /* NETUNIX */
527 #endif /* _FFR_DAEMON_NETUNIX */
528 #if NETINET
529 			  case AF_INET:
530 				macdefine(&BlankEnvelope.e_macro, A_PERM,
531 					macid("{daemon_family}"), "inet");
532 				break;
533 #endif /* NETINET */
534 #if NETINET6
535 			  case AF_INET6:
536 				macdefine(&BlankEnvelope.e_macro, A_PERM,
537 					macid("{daemon_family}"), "inet6");
538 				break;
539 #endif /* NETINET6 */
540 #if NETISO
541 			  case AF_ISO:
542 				macdefine(&BlankEnvelope.e_macro, A_PERM,
543 					macid("{daemon_family}"), "iso");
544 				break;
545 #endif /* NETISO */
546 #if NETNS
547 			  case AF_NS:
548 				macdefine(&BlankEnvelope.e_macro, A_PERM,
549 					macid("{daemon_family}"), "ns");
550 				break;
551 #endif /* NETNS */
552 #if NETX25
553 			  case AF_CCITT:
554 				macdefine(&BlankEnvelope.e_macro, A_PERM,
555 					macid("{daemon_family}"), "x.25");
556 				break;
557 #endif /* NETX25 */
558 			}
559 			macdefine(&BlankEnvelope.e_macro, A_PERM,
560 				macid("{daemon_name}"),
561 				Daemons[curdaemon].d_name);
562 			if (Daemons[curdaemon].d_mflags != NULL)
563 				macdefine(&BlankEnvelope.e_macro, A_PERM,
564 					macid("{daemon_flags}"),
565 					Daemons[curdaemon].d_mflags);
566 			else
567 				macdefine(&BlankEnvelope.e_macro, A_PERM,
568 					macid("{daemon_flags}"), "");
569 		}
570 
571 		/*
572 		**  If connection rate is exceeded here, connection shall be
573 		**  refused later by a new call after fork() by the
574 		**  validate_connection() function. Closing the connection
575 		**  at this point violates RFC 2821.
576 		**  Do NOT remove this call, its side effects are needed.
577 		*/
578 
579 		connection_rate_check(&RealHostAddr, NULL);
580 
581 		/*
582 		**  Create a subprocess to process the mail.
583 		*/
584 
585 		if (tTd(15, 2))
586 			sm_dprintf("getrequests: forking (fd = %d)\n", t);
587 
588 		/*
589 		**  Advance state of PRNG.
590 		**  This is necessary because otherwise all child processes
591 		**  will produce the same PRN sequence and hence the selection
592 		**  of a queue directory (and other things, e.g., MX selection)
593 		**  are not "really" random.
594 		*/
595 #if STARTTLS
596 		/* XXX get some better "random" data? */
597 		seed = get_random();
598 		RAND_seed((void *) &NextDiskSpaceCheck,
599 			  sizeof(NextDiskSpaceCheck));
600 		RAND_seed((void *) &now, sizeof(now));
601 		RAND_seed((void *) &seed, sizeof(seed));
602 #else /* STARTTLS */
603 		(void) get_random();
604 #endif /* STARTTLS */
605 
606 #if NAMED_BIND
607 		/*
608 		**  Update MX records for FallbackMX.
609 		**  Let's hope this is fast otherwise we screw up the
610 		**  response time.
611 		*/
612 
613 		if (FallbackMX != NULL)
614 			(void) getfallbackmxrr(FallbackMX);
615 #endif /* NAMED_BIND */
616 
617 		if (tTd(93, 100))
618 		{
619 			/* don't fork, handle connection in this process */
620 			pid = 0;
621 			pipefd[0] = pipefd[1] = -1;
622 		}
623 		else
624 		{
625 			/*
626 			**  Create a pipe to keep the child from writing to
627 			**  the socket until after the parent has closed
628 			**  it.  Otherwise the parent may hang if the child
629 			**  has closed it first.
630 			*/
631 
632 			if (pipe(pipefd) < 0)
633 				pipefd[0] = pipefd[1] = -1;
634 
635 			(void) sm_blocksignal(SIGCHLD);
636 			pid = fork();
637 			if (pid < 0)
638 			{
639 				syserr("daemon: cannot fork");
640 				if (pipefd[0] != -1)
641 				{
642 					(void) close(pipefd[0]);
643 					(void) close(pipefd[1]);
644 				}
645 				(void) sm_releasesignal(SIGCHLD);
646 				(void) sleep(10);
647 				(void) close(t);
648 				continue;
649 			}
650 		}
651 
652 		if (pid == 0)
653 		{
654 			char *p;
655 			SM_FILE_T *inchannel, *outchannel = NULL;
656 
657 			/*
658 			**  CHILD -- return to caller.
659 			**	Collect verified idea of sending host.
660 			**	Verify calling user id if possible here.
661 			*/
662 
663 			/* Reset global flags */
664 			RestartRequest = NULL;
665 			RestartWorkGroup = false;
666 			ShutdownRequest = NULL;
667 			PendingSignal = 0;
668 			CurrentPid = getpid();
669 			close_sendmail_pid();
670 
671 			(void) sm_releasesignal(SIGALRM);
672 			(void) sm_releasesignal(SIGCHLD);
673 			(void) sm_signal(SIGCHLD, SIG_DFL);
674 			(void) sm_signal(SIGHUP, SIG_DFL);
675 			(void) sm_signal(SIGTERM, intsig);
676 
677 			/* turn on profiling */
678 			/* SM_PROF(0); */
679 
680 			/*
681 			**  Initialize exception stack and default exception
682 			**  handler for child process.
683 			*/
684 
685 			sm_exc_newthread(fatal_error);
686 
687 			if (!control)
688 			{
689 				macdefine(&BlankEnvelope.e_macro, A_TEMP,
690 					macid("{daemon_addr}"),
691 					anynet_ntoa(&Daemons[curdaemon].d_addr));
692 				(void) sm_snprintf(status, sizeof(status), "%d",
693 						ntohs(Daemons[curdaemon].d_port));
694 				macdefine(&BlankEnvelope.e_macro, A_TEMP,
695 					macid("{daemon_port}"), status);
696 			}
697 
698 			for (idx = 0; idx < NDaemons; idx++)
699 			{
700 				if (Daemons[idx].d_socket >= 0)
701 					(void) close(Daemons[idx].d_socket);
702 				Daemons[idx].d_socket = -1;
703 			}
704 			clrcontrol();
705 
706 			/* Avoid SMTP daemon actions if control command */
707 			if (control)
708 			{
709 				/* Add control socket process */
710 				proc_list_add(CurrentPid,
711 					      "console socket child",
712 					      PROC_CONTROL_CHILD, 0, -1, NULL);
713 			}
714 			else
715 			{
716 				proc_list_clear();
717 
718 				/* clean up background delivery children */
719 				(void) sm_signal(SIGCHLD, reapchild);
720 
721 				/* Add parent process as first child item */
722 				proc_list_add(CurrentPid, "daemon child",
723 					      PROC_DAEMON_CHILD, 0, -1, NULL);
724 				/* don't schedule queue runs if ETRN */
725 				QueueIntvl = 0;
726 
727 				/*
728 				**  Hack: override global variables if
729 				**	the corresponding DaemonPortOption
730 				**	is set.
731 				*/
732 #if _FFR_SS_PER_DAEMON
733 				if (Daemons[curdaemon].d_supersafe !=
734 				    DPO_NOTSET)
735 					SuperSafe = Daemons[curdaemon].
736 								d_supersafe;
737 #endif /* _FFR_SS_PER_DAEMON */
738 				if (Daemons[curdaemon].d_dm != DM_NOTSET)
739 					set_delivery_mode(
740 						Daemons[curdaemon].d_dm, e);
741 
742 				if (Daemons[curdaemon].d_refuseLA !=
743 				    DPO_NOTSET)
744 					RefuseLA = Daemons[curdaemon].
745 								d_refuseLA;
746 				if (Daemons[curdaemon].d_queueLA != DPO_NOTSET)
747 					QueueLA = Daemons[curdaemon].d_queueLA;
748 				if (Daemons[curdaemon].d_delayLA != DPO_NOTSET)
749 					DelayLA = Daemons[curdaemon].d_delayLA;
750 				if (Daemons[curdaemon].d_maxchildren !=
751 				    DPO_NOTSET)
752 					MaxChildren = Daemons[curdaemon].
753 								d_maxchildren;
754 
755 				sm_setproctitle(true, e, "startup with %s",
756 						anynet_ntoa(&RealHostAddr));
757 			}
758 
759 			if (pipefd[0] != -1)
760 			{
761 				auto char c;
762 
763 				/*
764 				**  Wait for the parent to close the write end
765 				**  of the pipe, which we will see as an EOF.
766 				**  This guarantees that we won't write to the
767 				**  socket until after the parent has closed
768 				**  the pipe.
769 				*/
770 
771 				/* close the write end of the pipe */
772 				(void) close(pipefd[1]);
773 
774 				/* we shouldn't be interrupted, but ... */
775 				while (read(pipefd[0], &c, 1) < 0 &&
776 				       errno == EINTR)
777 					continue;
778 				(void) close(pipefd[0]);
779 			}
780 
781 			/* control socket processing */
782 			if (control)
783 			{
784 				control_command(t, e);
785 				/* NOTREACHED */
786 				exit(EX_SOFTWARE);
787 			}
788 
789 			/* determine host name */
790 			p = hostnamebyanyaddr(&RealHostAddr);
791 			if (strlen(p) > MAXNAME) /* XXX  - 1 ? */
792 				p[MAXNAME] = '\0';
793 			RealHostName = newstr(p);
794 			if (RealHostName[0] == '[')
795 			{
796 				macdefine(&BlankEnvelope.e_macro, A_PERM,
797 					macid("{client_resolve}"),
798 					h_errno == TRY_AGAIN ? "TEMP" : "FAIL");
799 			}
800 			else
801 			{
802 				macdefine(&BlankEnvelope.e_macro, A_PERM,
803 					  macid("{client_resolve}"), "OK");
804 			}
805 			sm_setproctitle(true, e, "startup with %s", p);
806 			markstats(e, NULL, STATS_CONNECT);
807 
808 			if ((inchannel = sm_io_open(SmFtStdiofd,
809 						    SM_TIME_DEFAULT,
810 						    (void *) &t,
811 						    SM_IO_RDONLY_B,
812 						    NULL)) == NULL ||
813 			    (t = dup(t)) < 0 ||
814 			    (outchannel = sm_io_open(SmFtStdiofd,
815 						     SM_TIME_DEFAULT,
816 						     (void *) &t,
817 						     SM_IO_WRONLY_B,
818 						     NULL)) == NULL)
819 			{
820 				syserr("cannot open SMTP server channel, fd=%d",
821 					t);
822 				finis(false, true, EX_OK);
823 			}
824 			sm_io_automode(inchannel, outchannel);
825 
826 			InChannel = inchannel;
827 			OutChannel = outchannel;
828 			DisConnected = false;
829 
830 #if XLA
831 			if (!xla_host_ok(RealHostName))
832 			{
833 				message("421 4.4.5 Too many SMTP sessions for this host");
834 				finis(false, true, EX_OK);
835 			}
836 #endif /* XLA */
837 			/* find out name for interface of connection */
838 			if (getsockname(sm_io_getinfo(InChannel, SM_IO_WHAT_FD,
839 						      NULL), &sa.sa, &len) == 0)
840 			{
841 				p = hostnamebyanyaddr(&sa);
842 				if (tTd(15, 9))
843 					sm_dprintf("getreq: got name %s\n", p);
844 				macdefine(&BlankEnvelope.e_macro, A_TEMP,
845 					macid("{if_name}"), p);
846 
847 				/*
848 				**  Do this only if it is not the loopback
849 				**  interface.
850 				*/
851 
852 				if (!isloopback(sa))
853 				{
854 					char *addr;
855 					char family[5];
856 
857 					addr = anynet_ntoa(&sa);
858 					(void) sm_snprintf(family,
859 						sizeof(family),
860 						"%d", sa.sa.sa_family);
861 					macdefine(&BlankEnvelope.e_macro,
862 						A_TEMP,
863 						macid("{if_addr}"), addr);
864 					macdefine(&BlankEnvelope.e_macro,
865 						A_TEMP,
866 						macid("{if_family}"), family);
867 					if (tTd(15, 7))
868 						sm_dprintf("getreq: got addr %s and family %s\n",
869 							addr, family);
870 				}
871 				else
872 				{
873 					macdefine(&BlankEnvelope.e_macro,
874 						A_PERM,
875 						macid("{if_addr}"), NULL);
876 					macdefine(&BlankEnvelope.e_macro,
877 						A_PERM,
878 						macid("{if_family}"), NULL);
879 				}
880 			}
881 			else
882 			{
883 				if (tTd(15, 7))
884 					sm_dprintf("getreq: getsockname failed\n");
885 				macdefine(&BlankEnvelope.e_macro, A_PERM,
886 					macid("{if_name}"), NULL);
887 				macdefine(&BlankEnvelope.e_macro, A_PERM,
888 					macid("{if_addr}"), NULL);
889 				macdefine(&BlankEnvelope.e_macro, A_PERM,
890 					macid("{if_family}"), NULL);
891 			}
892 			break;
893 		}
894 
895 		/* parent -- keep track of children */
896 		if (control)
897 		{
898 			(void) sm_snprintf(status, sizeof(status),
899 					   "control socket server child");
900 			proc_list_add(pid, status, PROC_CONTROL, 0, -1, NULL);
901 		}
902 		else
903 		{
904 			(void) sm_snprintf(status, sizeof(status),
905 					   "SMTP server child for %s",
906 					   anynet_ntoa(&RealHostAddr));
907 			proc_list_add(pid, status, PROC_DAEMON, 0, -1,
908 					&RealHostAddr);
909 		}
910 		(void) sm_releasesignal(SIGCHLD);
911 
912 		/* close the read end of the synchronization pipe */
913 		if (pipefd[0] != -1)
914 		{
915 			(void) close(pipefd[0]);
916 			pipefd[0] = -1;
917 		}
918 
919 		/* close the port so that others will hang (for a while) */
920 		(void) close(t);
921 
922 		/* release the child by closing the read end of the sync pipe */
923 		if (pipefd[1] != -1)
924 		{
925 			(void) close(pipefd[1]);
926 			pipefd[1] = -1;
927 		}
928 	}
929 	if (tTd(15, 2))
930 		sm_dprintf("getreq: returning\n");
931 
932 #if MILTER
933 	/* set the filters for this daemon */
934 	if (Daemons[curdaemon].d_inputfilterlist != NULL)
935 	{
936 		for (i = 0;
937 		     (i < MAXFILTERS &&
938 		      Daemons[curdaemon].d_inputfilters[i] != NULL);
939 		     i++)
940 		{
941 			InputFilters[i] = Daemons[curdaemon].d_inputfilters[i];
942 		}
943 		if (i < MAXFILTERS)
944 			InputFilters[i] = NULL;
945 	}
946 #endif /* MILTER */
947 	return &Daemons[curdaemon].d_flags;
948 }
949 
950 /*
951 **  GETREQUESTS_CHECKDISKSPACE -- check available diskspace.
952 **
953 **	Parameters:
954 **		e -- envelope.
955 **
956 **	Returns:
957 **		none.
958 **
959 **	Side Effects:
960 **		Modifies Daemon flags (D_ETRNONLY) if not enough disk space.
961 */
962 
963 static void
getrequests_checkdiskspace(e)964 getrequests_checkdiskspace(e)
965 	ENVELOPE *e;
966 {
967 	bool logged = false;
968 	int idx;
969 	time_t now;
970 
971 	now = curtime();
972 	if (now < NextDiskSpaceCheck)
973 		return;
974 
975 	/* Check if there is available disk space in all queue groups. */
976 	if (!enoughdiskspace(0, NULL))
977 	{
978 		for (idx = 0; idx < NDaemons; ++idx)
979 		{
980 			if (bitnset(D_ETRNONLY, Daemons[idx].d_flags))
981 				continue;
982 
983 			/* log only if not logged before */
984 			if (!logged)
985 			{
986 				if (LogLevel > 8)
987 					sm_syslog(LOG_INFO, NOQID,
988 						  "rejecting new messages: min free: %ld",
989 						  MinBlocksFree);
990 				sm_setproctitle(true, e,
991 						"rejecting new messages: min free: %ld",
992 						MinBlocksFree);
993 				logged = true;
994 			}
995 			setbitn(D_ETRNONLY, Daemons[idx].d_flags);
996 		}
997 	}
998 	else
999 	{
1000 		for (idx = 0; idx < NDaemons; ++idx)
1001 		{
1002 			if (!bitnset(D_ETRNONLY, Daemons[idx].d_flags))
1003 				continue;
1004 
1005 			/* log only if not logged before */
1006 			if (!logged)
1007 			{
1008 				if (LogLevel > 8)
1009 					sm_syslog(LOG_INFO, NOQID,
1010 						  "accepting new messages (again)");
1011 				logged = true;
1012 			}
1013 
1014 			/* title will be set later */
1015 			clrbitn(D_ETRNONLY, Daemons[idx].d_flags);
1016 		}
1017 	}
1018 
1019 	/* only check disk space once a minute */
1020 	NextDiskSpaceCheck = now + 60;
1021 }
1022 
1023 /*
1024 **  OPENDAEMONSOCKET -- open SMTP socket
1025 **
1026 **	Deals with setting all appropriate options.
1027 **
1028 **	Parameters:
1029 **		d -- the structure for the daemon to open.
1030 **		firsttime -- set if this is the initial open.
1031 **
1032 **	Returns:
1033 **		Size in bytes of the daemon socket addr.
1034 **
1035 **	Side Effects:
1036 **		Leaves DaemonSocket set to the open socket.
1037 **		Exits if the socket cannot be created.
1038 */
1039 
1040 #define MAXOPENTRIES	10	/* maximum number of tries to open connection */
1041 
1042 static int
opendaemonsocket(d,firsttime)1043 opendaemonsocket(d, firsttime)
1044 	DAEMON_T *d;
1045 	bool firsttime;
1046 {
1047 	int on = 1;
1048 	int fdflags;
1049 	SOCKADDR_LEN_T socksize = 0;
1050 	int ntries = 0;
1051 	int save_errno;
1052 
1053 	if (tTd(15, 2))
1054 		sm_dprintf("opendaemonsocket(%s)\n", d->d_name);
1055 
1056 	do
1057 	{
1058 		if (ntries > 0)
1059 			(void) sleep(5);
1060 		if (firsttime || d->d_socket < 0)
1061 		{
1062 #if _FFR_DAEMON_NETUNIX
1063 # if NETUNIX
1064 			if (d->d_addr.sa.sa_family == AF_UNIX)
1065 			{
1066 				int rval;
1067 				long sff = SFF_SAFEDIRPATH|SFF_OPENASROOT|SFF_NOLINK|SFF_ROOTOK|SFF_EXECOK|SFF_CREAT;
1068 
1069 				/* if not safe, don't use it */
1070 				rval = safefile(d->d_addr.sunix.sun_path,
1071 						RunAsUid, RunAsGid,
1072 						RunAsUserName, sff,
1073 						S_IRUSR|S_IWUSR, NULL);
1074 				if (rval != 0)
1075 				{
1076 					save_errno = errno;
1077 					syserr("opendaemonsocket: daemon %s: unsafe domain socket %s",
1078 					       d->d_name,
1079 					       d->d_addr.sunix.sun_path);
1080 					goto fail;
1081 				}
1082 
1083 				/* Don't try to overtake an existing socket */
1084 				(void) unlink(d->d_addr.sunix.sun_path);
1085 			}
1086 # endif /* NETUNIX */
1087 #endif /* _FFR_DOMAIN_NETUNIX */
1088 			d->d_socket = socket(d->d_addr.sa.sa_family,
1089 					     SOCK_STREAM, 0);
1090 			if (d->d_socket < 0)
1091 			{
1092 				save_errno = errno;
1093 				syserr("opendaemonsocket: daemon %s: can't create server SMTP socket",
1094 				       d->d_name);
1095 			  fail:
1096 				if (bitnset(D_OPTIONAL, d->d_flags) &&
1097 				    (!transienterror(save_errno) ||
1098 				     ntries >= MAXOPENTRIES - 1))
1099 				{
1100 					syserr("opendaemonsocket: daemon %s: optional socket disabled",
1101 					       d->d_name);
1102 					setbitn(D_DISABLE, d->d_flags);
1103 					d->d_socket = -1;
1104 					return -1;
1105 				}
1106 			  severe:
1107 				if (LogLevel > 0)
1108 					sm_syslog(LOG_ALERT, NOQID,
1109 						  "daemon %s: problem creating SMTP socket",
1110 						  d->d_name);
1111 				d->d_socket = -1;
1112 				continue;
1113 			}
1114 
1115 			if (SM_FD_SETSIZE > 0 && d->d_socket >= SM_FD_SETSIZE)
1116 			{
1117 				save_errno = EINVAL;
1118 				syserr("opendaemonsocket: daemon %s: server SMTP socket (%d) too large",
1119 				       d->d_name, d->d_socket);
1120 				goto fail;
1121 			}
1122 
1123 			/* turn on network debugging? */
1124 			if (tTd(15, 101))
1125 				(void) setsockopt(d->d_socket, SOL_SOCKET,
1126 						  SO_DEBUG, (char *)&on,
1127 						  sizeof(on));
1128 
1129 			(void) setsockopt(d->d_socket, SOL_SOCKET,
1130 					  SO_REUSEADDR, (char *)&on, sizeof(on));
1131 			(void) setsockopt(d->d_socket, SOL_SOCKET,
1132 					  SO_KEEPALIVE, (char *)&on, sizeof(on));
1133 
1134 #ifdef SO_RCVBUF
1135 			if (d->d_tcprcvbufsize > 0)
1136 			{
1137 				if (setsockopt(d->d_socket, SOL_SOCKET,
1138 					       SO_RCVBUF,
1139 					       (char *) &d->d_tcprcvbufsize,
1140 					       sizeof(d->d_tcprcvbufsize)) < 0)
1141 					syserr("opendaemonsocket: daemon %s: setsockopt(SO_RCVBUF)", d->d_name);
1142 			}
1143 #endif /* SO_RCVBUF */
1144 #ifdef SO_SNDBUF
1145 			if (d->d_tcpsndbufsize > 0)
1146 			{
1147 				if (setsockopt(d->d_socket, SOL_SOCKET,
1148 					       SO_SNDBUF,
1149 					       (char *) &d->d_tcpsndbufsize,
1150 					       sizeof(d->d_tcpsndbufsize)) < 0)
1151 					syserr("opendaemonsocket: daemon %s: setsockopt(SO_SNDBUF)", d->d_name);
1152 			}
1153 #endif /* SO_SNDBUF */
1154 
1155 			if ((fdflags = fcntl(d->d_socket, F_GETFD, 0)) == -1 ||
1156 			    fcntl(d->d_socket, F_SETFD,
1157 				  fdflags | FD_CLOEXEC) == -1)
1158 			{
1159 				save_errno = errno;
1160 				syserr("opendaemonsocket: daemon %s: failed to %s close-on-exec flag: %s",
1161 				       d->d_name,
1162 				       fdflags == -1 ? "get" : "set",
1163 				       sm_errstring(save_errno));
1164 				(void) close(d->d_socket);
1165 				goto severe;
1166 			}
1167 
1168 			switch (d->d_addr.sa.sa_family)
1169 			{
1170 #if _FFR_DAEMON_NETUNIX
1171 # ifdef NETUNIX
1172 			  case AF_UNIX:
1173 				socksize = sizeof(d->d_addr.sunix);
1174 				break;
1175 # endif /* NETUNIX */
1176 #endif /* _FFR_DAEMON_NETUNIX */
1177 #if NETINET
1178 			  case AF_INET:
1179 				socksize = sizeof(d->d_addr.sin);
1180 				break;
1181 #endif /* NETINET */
1182 
1183 #if NETINET6
1184 			  case AF_INET6:
1185 				socksize = sizeof(d->d_addr.sin6);
1186 				break;
1187 #endif /* NETINET6 */
1188 
1189 #if NETISO
1190 			  case AF_ISO:
1191 				socksize = sizeof(d->d_addr.siso);
1192 				break;
1193 #endif /* NETISO */
1194 
1195 			  default:
1196 				socksize = sizeof(d->d_addr);
1197 				break;
1198 			}
1199 
1200 			if (bind(d->d_socket, &d->d_addr.sa, socksize) < 0)
1201 			{
1202 				/* probably another daemon already */
1203 				save_errno = errno;
1204 				syserr("opendaemonsocket: daemon %s: cannot bind",
1205 				       d->d_name);
1206 				(void) close(d->d_socket);
1207 				goto fail;
1208 			}
1209 		}
1210 		if (!firsttime &&
1211 		    listen(d->d_socket, d->d_listenqueue) < 0)
1212 		{
1213 			save_errno = errno;
1214 			syserr("opendaemonsocket: daemon %s: cannot listen",
1215 			       d->d_name);
1216 			(void) close(d->d_socket);
1217 			goto severe;
1218 		}
1219 		return socksize;
1220 	} while (ntries++ < MAXOPENTRIES && transienterror(save_errno));
1221 	syserr("!opendaemonsocket: daemon %s: server SMTP socket wedged: exiting",
1222 	       d->d_name);
1223 	/* NOTREACHED */
1224 	return -1;  /* avoid compiler warning on IRIX */
1225 }
1226 /*
1227 **  SETUPDAEMON -- setup socket for daemon
1228 **
1229 **	Parameters:
1230 **		daemonaddr -- socket for daemon
1231 **
1232 **	Returns:
1233 **		port number on which daemon should run
1234 **
1235 */
1236 
1237 static unsigned short
setupdaemon(daemonaddr)1238 setupdaemon(daemonaddr)
1239 	SOCKADDR *daemonaddr;
1240 {
1241 	unsigned short port;
1242 
1243 	/*
1244 	**  Set up the address for the mailer.
1245 	*/
1246 
1247 	if (daemonaddr->sa.sa_family == AF_UNSPEC)
1248 	{
1249 		memset(daemonaddr, '\0', sizeof(*daemonaddr));
1250 #if NETINET
1251 		daemonaddr->sa.sa_family = AF_INET;
1252 #endif /* NETINET */
1253 	}
1254 
1255 	switch (daemonaddr->sa.sa_family)
1256 	{
1257 #if NETINET
1258 	  case AF_INET:
1259 		if (daemonaddr->sin.sin_addr.s_addr == 0)
1260 			daemonaddr->sin.sin_addr.s_addr =
1261 			    LocalDaemon ? htonl(INADDR_LOOPBACK) : INADDR_ANY;
1262 		port = daemonaddr->sin.sin_port;
1263 		break;
1264 #endif /* NETINET */
1265 
1266 #if NETINET6
1267 	  case AF_INET6:
1268 		if (IN6_IS_ADDR_UNSPECIFIED(&daemonaddr->sin6.sin6_addr))
1269 			daemonaddr->sin6.sin6_addr =
1270 			    LocalDaemon ? in6addr_loopback : in6addr_any;
1271 		port = daemonaddr->sin6.sin6_port;
1272 		break;
1273 #endif /* NETINET6 */
1274 
1275 	  default:
1276 		/* unknown protocol */
1277 		port = 0;
1278 		break;
1279 	}
1280 	if (port == 0)
1281 	{
1282 #ifdef NO_GETSERVBYNAME
1283 		port = htons(25);
1284 #else /* NO_GETSERVBYNAME */
1285 		{
1286 			register struct servent *sp;
1287 
1288 			sp = getservbyname("smtp", "tcp");
1289 			if (sp == NULL)
1290 			{
1291 				syserr("554 5.3.5 service \"smtp\" unknown");
1292 				port = htons(25);
1293 			}
1294 			else
1295 				port = sp->s_port;
1296 		}
1297 #endif /* NO_GETSERVBYNAME */
1298 	}
1299 
1300 	switch (daemonaddr->sa.sa_family)
1301 	{
1302 #if NETINET
1303 	  case AF_INET:
1304 		daemonaddr->sin.sin_port = port;
1305 		break;
1306 #endif /* NETINET */
1307 
1308 #if NETINET6
1309 	  case AF_INET6:
1310 		daemonaddr->sin6.sin6_port = port;
1311 		break;
1312 #endif /* NETINET6 */
1313 
1314 	  default:
1315 		/* unknown protocol */
1316 		break;
1317 	}
1318 	return port;
1319 }
1320 /*
1321 **  CLRDAEMON -- reset the daemon connection
1322 **
1323 **	Parameters:
1324 **		none.
1325 **
1326 **	Returns:
1327 **		none.
1328 **
1329 **	Side Effects:
1330 **		releases any resources used by the passive daemon.
1331 */
1332 
1333 void
clrdaemon()1334 clrdaemon()
1335 {
1336 	int i;
1337 
1338 	for (i = 0; i < NDaemons; i++)
1339 	{
1340 		if (Daemons[i].d_socket >= 0)
1341 			(void) close(Daemons[i].d_socket);
1342 		Daemons[i].d_socket = -1;
1343 	}
1344 }
1345 
1346 /*
1347 **  GETMODIFIERS -- get modifier flags
1348 **
1349 **	Parameters:
1350 **		v -- the modifiers (input text line).
1351 **		modifiers -- pointer to flag field to represent modifiers.
1352 **
1353 **	Returns:
1354 **		(xallocat()ed) string representation of modifiers.
1355 **
1356 **	Side Effects:
1357 **		fills in modifiers.
1358 */
1359 
1360 char *
getmodifiers(v,modifiers)1361 getmodifiers(v, modifiers)
1362 	char *v;
1363 	BITMAP256 modifiers;
1364 {
1365 	int l;
1366 	char *h, *f, *flags;
1367 
1368 	/* maximum length of flags: upper case Option -> "OO " */
1369 	l = 3 * strlen(v) + 3;
1370 
1371 	/* is someone joking? */
1372 	if (l < 0 || l > 256)
1373 	{
1374 		if (LogLevel > 2)
1375 			sm_syslog(LOG_ERR, NOQID,
1376 				  "getmodifiers too long, ignored");
1377 		return NULL;
1378 	}
1379 	flags = xalloc(l);
1380 	f = flags;
1381 	clrbitmap(modifiers);
1382 	for (h = v; *h != '\0'; h++)
1383 	{
1384 		if (isascii(*h) && !isspace(*h) && isprint(*h))
1385 		{
1386 			setbitn(*h, modifiers);
1387 			if (flags != f)
1388 				*flags++ = ' ';
1389 			*flags++ = *h;
1390 			if (isupper(*h))
1391 				*flags++ = *h;
1392 		}
1393 	}
1394 	*flags++ = '\0';
1395 	return f;
1396 }
1397 
1398 /*
1399 **  CHKDAEMONMODIFIERS -- check whether all daemons have set a flag.
1400 **
1401 **	Parameters:
1402 **		flag -- the flag to test.
1403 **
1404 **	Returns:
1405 **		true iff all daemons have set flag.
1406 */
1407 
1408 bool
chkdaemonmodifiers(flag)1409 chkdaemonmodifiers(flag)
1410 	int flag;
1411 {
1412 	int i;
1413 
1414 	for (i = 0; i < NDaemons; i++)
1415 		if (!bitnset((char) flag, Daemons[i].d_flags))
1416 			return false;
1417 	return true;
1418 }
1419 
1420 /*
1421 **  SETSOCKADDROPTIONS -- set options for SOCKADDR (daemon or client)
1422 **
1423 **	Parameters:
1424 **		p -- the options line.
1425 **		d -- the daemon structure to fill in.
1426 **
1427 **	Returns:
1428 **		none.
1429 */
1430 
1431 static void
setsockaddroptions(p,d)1432 setsockaddroptions(p, d)
1433 	char *p;
1434 	DAEMON_T *d;
1435 {
1436 #if NETISO
1437 	short portno;
1438 #endif /* NETISO */
1439 	char *port = NULL;
1440 	char *addr = NULL;
1441 
1442 #if NETINET
1443 	if (d->d_addr.sa.sa_family == AF_UNSPEC)
1444 		d->d_addr.sa.sa_family = AF_INET;
1445 #endif /* NETINET */
1446 #if _FFR_SS_PER_DAEMON
1447 	d->d_supersafe = DPO_NOTSET;
1448 #endif /* _FFR_SS_PER_DAEMON */
1449 	d->d_dm = DM_NOTSET;
1450 	d->d_refuseLA = DPO_NOTSET;
1451 	d->d_queueLA = DPO_NOTSET;
1452 	d->d_delayLA = DPO_NOTSET;
1453 	d->d_maxchildren = DPO_NOTSET;
1454 
1455 	while (p != NULL)
1456 	{
1457 		register char *f;
1458 		register char *v;
1459 
1460 		while (isascii(*p) && isspace(*p))
1461 			p++;
1462 		if (*p == '\0')
1463 			break;
1464 		f = p;
1465 		p = strchr(p, ',');
1466 		if (p != NULL)
1467 			*p++ = '\0';
1468 		v = strchr(f, '=');
1469 		if (v == NULL)
1470 			continue;
1471 		while (isascii(*++v) && isspace(*v))
1472 			continue;
1473 
1474 		switch (*f)
1475 		{
1476 		  case 'A':		/* address */
1477 #if !_FFR_DPO_CS
1478 		  case 'a':
1479 #endif /* !_FFR_DPO_CS */
1480 			addr = v;
1481 			break;
1482 
1483 		  case 'c':
1484 			d->d_maxchildren = atoi(v);
1485 			break;
1486 
1487 		  case 'D':		/* DeliveryMode */
1488 			switch (*v)
1489 			{
1490 			  case SM_QUEUE:
1491 			  case SM_DEFER:
1492 			  case SM_DELIVER:
1493 			  case SM_FORK:
1494 				d->d_dm = *v;
1495 				break;
1496 			  default:
1497 				syserr("554 5.3.5 Unknown delivery mode %c",
1498 					*v);
1499 				break;
1500 			}
1501 			break;
1502 
1503 		  case 'd':		/* delayLA */
1504 			d->d_delayLA = atoi(v);
1505 			break;
1506 
1507 		  case 'F':		/* address family */
1508 #if !_FFR_DPO_CS
1509 		  case 'f':
1510 #endif /* !_FFR_DPO_CS */
1511 			if (isascii(*v) && isdigit(*v))
1512 				d->d_addr.sa.sa_family = atoi(v);
1513 #if _FFR_DAEMON_NETUNIX
1514 # ifdef NETUNIX
1515 			else if (sm_strcasecmp(v, "unix") == 0 ||
1516 				 sm_strcasecmp(v, "local") == 0)
1517 				d->d_addr.sa.sa_family = AF_UNIX;
1518 # endif /* NETUNIX */
1519 #endif /* _FFR_DAEMON_NETUNIX */
1520 #if NETINET
1521 			else if (sm_strcasecmp(v, "inet") == 0)
1522 				d->d_addr.sa.sa_family = AF_INET;
1523 #endif /* NETINET */
1524 #if NETINET6
1525 			else if (sm_strcasecmp(v, "inet6") == 0)
1526 				d->d_addr.sa.sa_family = AF_INET6;
1527 #endif /* NETINET6 */
1528 #if NETISO
1529 			else if (sm_strcasecmp(v, "iso") == 0)
1530 				d->d_addr.sa.sa_family = AF_ISO;
1531 #endif /* NETISO */
1532 #if NETNS
1533 			else if (sm_strcasecmp(v, "ns") == 0)
1534 				d->d_addr.sa.sa_family = AF_NS;
1535 #endif /* NETNS */
1536 #if NETX25
1537 			else if (sm_strcasecmp(v, "x.25") == 0)
1538 				d->d_addr.sa.sa_family = AF_CCITT;
1539 #endif /* NETX25 */
1540 			else
1541 				syserr("554 5.3.5 Unknown address family %s in Family=option",
1542 				       v);
1543 			break;
1544 
1545 #if MILTER
1546 		  case 'I':
1547 # if !_FFR_DPO_CS
1548 		  case 'i':
1549 # endif /* !_FFR_DPO_CS */
1550 			d->d_inputfilterlist = v;
1551 			break;
1552 #endif /* MILTER */
1553 
1554 		  case 'L':		/* listen queue size */
1555 #if !_FFR_DPO_CS
1556 		  case 'l':
1557 #endif /* !_FFR_DPO_CS */
1558 			d->d_listenqueue = atoi(v);
1559 			break;
1560 
1561 		  case 'M':		/* modifiers (flags) */
1562 #if !_FFR_DPO_CS
1563 		  case 'm':
1564 #endif /* !_FFR_DPO_CS */
1565 			d->d_mflags = getmodifiers(v, d->d_flags);
1566 			break;
1567 
1568 		  case 'N':		/* name */
1569 #if !_FFR_DPO_CS
1570 		  case 'n':
1571 #endif /* !_FFR_DPO_CS */
1572 			d->d_name = v;
1573 			break;
1574 
1575 		  case 'P':		/* port */
1576 #if !_FFR_DPO_CS
1577 		  case 'p':
1578 #endif /* !_FFR_DPO_CS */
1579 			port = v;
1580 			break;
1581 
1582 		  case 'q':
1583 			d->d_queueLA = atoi(v);
1584 			break;
1585 
1586 		  case 'R':		/* receive buffer size */
1587 			d->d_tcprcvbufsize = atoi(v);
1588 			break;
1589 
1590 		  case 'r':
1591 			d->d_refuseLA = atoi(v);
1592 			break;
1593 
1594 		  case 'S':		/* send buffer size */
1595 #if !_FFR_DPO_CS
1596 		  case 's':
1597 #endif /* !_FFR_DPO_CS */
1598 			d->d_tcpsndbufsize = atoi(v);
1599 			break;
1600 
1601 #if _FFR_SS_PER_DAEMON
1602 		  case 'T':		/* SuperSafe */
1603 			if (tolower(*v) == 'i')
1604 				d->d_supersafe = SAFE_INTERACTIVE;
1605 			else if (tolower(*v) == 'p')
1606 # if MILTER
1607 				d->d_supersafe = SAFE_REALLY_POSTMILTER;
1608 # else /* MILTER */
1609 				(void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
1610 					"Warning: SuperSafe=PostMilter requires Milter support (-DMILTER)\n");
1611 # endif /* MILTER */
1612 			else
1613 				d->d_supersafe = atobool(v) ? SAFE_REALLY
1614 							: SAFE_NO;
1615 			break;
1616 #endif /* _FFR_SS_PER_DAEMON */
1617 
1618 		  default:
1619 			syserr("554 5.3.5 PortOptions parameter \"%s\" unknown",
1620 			       f);
1621 		}
1622 	}
1623 
1624 	/* Check addr and port after finding family */
1625 	if (addr != NULL)
1626 	{
1627 		switch (d->d_addr.sa.sa_family)
1628 		{
1629 #if _FFR_DAEMON_NETUNIX
1630 # if NETUNIX
1631 		  case AF_UNIX:
1632 			if (strlen(addr) >= sizeof(d->d_addr.sunix.sun_path))
1633 			{
1634 				errno = ENAMETOOLONG;
1635 				syserr("setsockaddroptions: domain socket name too long: %s > %d",
1636 				       addr, sizeof(d->d_addr.sunix.sun_path));
1637 				break;
1638 			}
1639 
1640 			/* file safety check done in opendaemonsocket() */
1641 			(void) memset(&d->d_addr.sunix.sun_path, '\0',
1642 				      sizeof(d->d_addr.sunix.sun_path));
1643 			(void) sm_strlcpy((char *)&d->d_addr.sunix.sun_path,
1644 					  addr,
1645 					  sizeof(d->d_addr.sunix.sun_path));
1646 			break;
1647 # endif /* NETUNIX */
1648 #endif	/* _FFR_DAEMON_NETUNIX */
1649 #if NETINET
1650 		  case AF_INET:
1651 			if (!isascii(*addr) || !isdigit(*addr) ||
1652 			    ((d->d_addr.sin.sin_addr.s_addr = inet_addr(addr))
1653 			     == INADDR_NONE))
1654 			{
1655 				register struct hostent *hp;
1656 
1657 				hp = sm_gethostbyname(addr, AF_INET);
1658 				if (hp == NULL)
1659 					syserr("554 5.3.0 host \"%s\" unknown",
1660 					       addr);
1661 				else
1662 				{
1663 					while (*(hp->h_addr_list) != NULL &&
1664 					       hp->h_addrtype != AF_INET)
1665 						hp->h_addr_list++;
1666 					if (*(hp->h_addr_list) == NULL)
1667 						syserr("554 5.3.0 host \"%s\" unknown",
1668 						       addr);
1669 					else
1670 						memmove(&d->d_addr.sin.sin_addr,
1671 							*(hp->h_addr_list),
1672 							INADDRSZ);
1673 # if NETINET6
1674 					freehostent(hp);
1675 					hp = NULL;
1676 # endif /* NETINET6 */
1677 				}
1678 			}
1679 			break;
1680 #endif /* NETINET */
1681 
1682 #if NETINET6
1683 		  case AF_INET6:
1684 			if (anynet_pton(AF_INET6, addr,
1685 					&d->d_addr.sin6.sin6_addr) != 1)
1686 			{
1687 				register struct hostent *hp;
1688 
1689 				hp = sm_gethostbyname(addr, AF_INET6);
1690 				if (hp == NULL)
1691 					syserr("554 5.3.0 host \"%s\" unknown",
1692 					       addr);
1693 				else
1694 				{
1695 					while (*(hp->h_addr_list) != NULL &&
1696 					       hp->h_addrtype != AF_INET6)
1697 						hp->h_addr_list++;
1698 					if (*(hp->h_addr_list) == NULL)
1699 						syserr("554 5.3.0 host \"%s\" unknown",
1700 						       addr);
1701 					else
1702 						memmove(&d->d_addr.sin6.sin6_addr,
1703 							*(hp->h_addr_list),
1704 							IN6ADDRSZ);
1705 					freehostent(hp);
1706 					hp = NULL;
1707 				}
1708 			}
1709 			break;
1710 #endif /* NETINET6 */
1711 
1712 		  default:
1713 			syserr("554 5.3.5 address= option unsupported for family %d",
1714 			       d->d_addr.sa.sa_family);
1715 			break;
1716 		}
1717 	}
1718 
1719 	if (port != NULL)
1720 	{
1721 		switch (d->d_addr.sa.sa_family)
1722 		{
1723 #if NETINET
1724 		  case AF_INET:
1725 			if (isascii(*port) && isdigit(*port))
1726 				d->d_addr.sin.sin_port = htons((unsigned short)
1727 						     atoi((const char *) port));
1728 			else
1729 			{
1730 # ifdef NO_GETSERVBYNAME
1731 				syserr("554 5.3.5 invalid port number: %s",
1732 				       port);
1733 # else /* NO_GETSERVBYNAME */
1734 				register struct servent *sp;
1735 
1736 				sp = getservbyname(port, "tcp");
1737 				if (sp == NULL)
1738 					syserr("554 5.3.5 service \"%s\" unknown",
1739 					       port);
1740 				else
1741 					d->d_addr.sin.sin_port = sp->s_port;
1742 # endif /* NO_GETSERVBYNAME */
1743 			}
1744 			break;
1745 #endif /* NETINET */
1746 
1747 #if NETINET6
1748 		  case AF_INET6:
1749 			if (isascii(*port) && isdigit(*port))
1750 				d->d_addr.sin6.sin6_port = htons((unsigned short)
1751 								  atoi(port));
1752 			else
1753 			{
1754 # ifdef NO_GETSERVBYNAME
1755 				syserr("554 5.3.5 invalid port number: %s",
1756 				       port);
1757 # else /* NO_GETSERVBYNAME */
1758 				register struct servent *sp;
1759 
1760 				sp = getservbyname(port, "tcp");
1761 				if (sp == NULL)
1762 					syserr("554 5.3.5 service \"%s\" unknown",
1763 					       port);
1764 				else
1765 					d->d_addr.sin6.sin6_port = sp->s_port;
1766 # endif /* NO_GETSERVBYNAME */
1767 			}
1768 			break;
1769 #endif /* NETINET6 */
1770 
1771 #if NETISO
1772 		  case AF_ISO:
1773 			/* assume two byte transport selector */
1774 			if (isascii(*port) && isdigit(*port))
1775 				portno = htons((unsigned short) atoi(port));
1776 			else
1777 			{
1778 # ifdef NO_GETSERVBYNAME
1779 				syserr("554 5.3.5 invalid port number: %s",
1780 				       port);
1781 # else /* NO_GETSERVBYNAME */
1782 				register struct servent *sp;
1783 
1784 				sp = getservbyname(port, "tcp");
1785 				if (sp == NULL)
1786 					syserr("554 5.3.5 service \"%s\" unknown",
1787 					       port);
1788 				else
1789 					portno = sp->s_port;
1790 # endif /* NO_GETSERVBYNAME */
1791 			}
1792 			memmove(TSEL(&d->d_addr.siso),
1793 				(char *) &portno, 2);
1794 			break;
1795 #endif /* NETISO */
1796 
1797 		  default:
1798 			syserr("554 5.3.5 Port= option unsupported for family %d",
1799 			       d->d_addr.sa.sa_family);
1800 			break;
1801 		}
1802 	}
1803 }
1804 /*
1805 **  SETDAEMONOPTIONS -- set options for running the MTA daemon
1806 **
1807 **	Parameters:
1808 **		p -- the options line.
1809 **
1810 **	Returns:
1811 **		true if successful, false otherwise.
1812 **
1813 **	Side Effects:
1814 **		increments number of daemons.
1815 */
1816 
1817 #define DEF_LISTENQUEUE	10
1818 
1819 struct dflags
1820 {
1821 	char	*d_name;
1822 	int	d_flag;
1823 };
1824 
1825 static struct dflags	DaemonFlags[] =
1826 {
1827 	{ "AUTHREQ",		D_AUTHREQ	},
1828 	{ "BINDIF",		D_BINDIF	},
1829 	{ "CANONREQ",		D_CANONREQ	},
1830 	{ "IFNHELO",		D_IFNHELO	},
1831 	{ "FQMAIL",		D_FQMAIL	},
1832 	{ "FQRCPT",		D_FQRCPT	},
1833 	{ "SMTPS",		D_SMTPS		},
1834 	{ "UNQUALOK",		D_UNQUALOK	},
1835 	{ "NOAUTH",		D_NOAUTH	},
1836 	{ "NOCANON",		D_NOCANON	},
1837 	{ "NOETRN",		D_NOETRN	},
1838 	{ "NOTLS",		D_NOTLS		},
1839 	{ "ETRNONLY",		D_ETRNONLY	},
1840 	{ "OPTIONAL",		D_OPTIONAL	},
1841 	{ "DISABLE",		D_DISABLE	},
1842 	{ "ISSET",		D_ISSET		},
1843 	{ NULL,			0		}
1844 };
1845 
1846 static void
printdaemonflags(d)1847 printdaemonflags(d)
1848 	DAEMON_T *d;
1849 {
1850 	register struct dflags *df;
1851 	bool first = true;
1852 
1853 	for (df = DaemonFlags; df->d_name != NULL; df++)
1854 	{
1855 		if (!bitnset(df->d_flag, d->d_flags))
1856 			continue;
1857 		if (first)
1858 			sm_dprintf("<%s", df->d_name);
1859 		else
1860 			sm_dprintf(",%s", df->d_name);
1861 		first = false;
1862 	}
1863 	if (!first)
1864 		sm_dprintf(">");
1865 }
1866 
1867 bool
setdaemonoptions(p)1868 setdaemonoptions(p)
1869 	register char *p;
1870 {
1871 	if (NDaemons >= MAXDAEMONS)
1872 		return false;
1873 	Daemons[NDaemons].d_socket = -1;
1874 	Daemons[NDaemons].d_listenqueue = DEF_LISTENQUEUE;
1875 	clrbitmap(Daemons[NDaemons].d_flags);
1876 	setsockaddroptions(p, &Daemons[NDaemons]);
1877 
1878 #if MILTER
1879 	if (Daemons[NDaemons].d_inputfilterlist != NULL)
1880 		Daemons[NDaemons].d_inputfilterlist = newstr(Daemons[NDaemons].d_inputfilterlist);
1881 #endif /* MILTER */
1882 
1883 	if (Daemons[NDaemons].d_name != NULL)
1884 		Daemons[NDaemons].d_name = newstr(Daemons[NDaemons].d_name);
1885 	else
1886 	{
1887 		char num[30];
1888 
1889 		(void) sm_snprintf(num, sizeof(num), "Daemon%d", NDaemons);
1890 		Daemons[NDaemons].d_name = newstr(num);
1891 	}
1892 
1893 	if (tTd(37, 1))
1894 	{
1895 		sm_dprintf("Daemon %s flags: ", Daemons[NDaemons].d_name);
1896 		printdaemonflags(&Daemons[NDaemons]);
1897 		sm_dprintf("\n");
1898 	}
1899 	++NDaemons;
1900 	return true;
1901 }
1902 /*
1903 **  INITDAEMON -- initialize daemon if not yet done.
1904 **
1905 **	Parameters:
1906 **		none
1907 **
1908 **	Returns:
1909 **		none
1910 **
1911 **	Side Effects:
1912 **		initializes structure for one daemon.
1913 */
1914 
1915 void
initdaemon()1916 initdaemon()
1917 {
1918 	if (NDaemons == 0)
1919 	{
1920 		Daemons[NDaemons].d_socket = -1;
1921 		Daemons[NDaemons].d_listenqueue = DEF_LISTENQUEUE;
1922 		Daemons[NDaemons].d_name = "Daemon0";
1923 		NDaemons = 1;
1924 	}
1925 }
1926 /*
1927 **  SETCLIENTOPTIONS -- set options for running the client
1928 **
1929 **	Parameters:
1930 **		p -- the options line.
1931 **
1932 **	Returns:
1933 **		none.
1934 */
1935 
1936 static DAEMON_T	ClientSettings[AF_MAX + 1];
1937 
1938 void
setclientoptions(p)1939 setclientoptions(p)
1940 	register char *p;
1941 {
1942 	int family;
1943 	DAEMON_T d;
1944 
1945 	memset(&d, '\0', sizeof(d));
1946 	setsockaddroptions(p, &d);
1947 
1948 	/* grab what we need */
1949 	family = d.d_addr.sa.sa_family;
1950 	STRUCTCOPY(d, ClientSettings[family]);
1951 	setbitn(D_ISSET, ClientSettings[family].d_flags); /* mark as set */
1952 	if (d.d_name != NULL)
1953 		ClientSettings[family].d_name = newstr(d.d_name);
1954 	else
1955 	{
1956 		char num[30];
1957 
1958 		(void) sm_snprintf(num, sizeof(num), "Client%d", family);
1959 		ClientSettings[family].d_name = newstr(num);
1960 	}
1961 }
1962 /*
1963 **  ADDR_FAMILY -- determine address family from address
1964 **
1965 **	Parameters:
1966 **		addr -- the string representation of the address
1967 **
1968 **	Returns:
1969 **		AF_INET, AF_INET6 or AF_UNSPEC
1970 **
1971 **	Side Effects:
1972 **		none.
1973 */
1974 
1975 static int
addr_family(addr)1976 addr_family(addr)
1977 	char *addr;
1978 {
1979 #if NETINET6
1980 	SOCKADDR clt_addr;
1981 #endif /* NETINET6 */
1982 
1983 #if NETINET
1984 	if (inet_addr(addr) != INADDR_NONE)
1985 	{
1986 		if (tTd(16, 9))
1987 			sm_dprintf("addr_family(%s): INET\n", addr);
1988 		return AF_INET;
1989 	}
1990 #endif /* NETINET */
1991 #if NETINET6
1992 	if (anynet_pton(AF_INET6, addr, &clt_addr.sin6.sin6_addr) == 1)
1993 	{
1994 		if (tTd(16, 9))
1995 			sm_dprintf("addr_family(%s): INET6\n", addr);
1996 		return AF_INET6;
1997 	}
1998 #endif /* NETINET6 */
1999 #if _FFR_DAEMON_NETUNIX
2000 # if NETUNIX
2001 	if (*addr == '/')
2002 	{
2003 		if (tTd(16, 9))
2004 			sm_dprintf("addr_family(%s): LOCAL\n", addr);
2005 		return AF_UNIX;
2006 	}
2007 # endif /* NETUNIX */
2008 #endif	/* _FFR_DAEMON_NETUNIX */
2009 	if (tTd(16, 9))
2010 		sm_dprintf("addr_family(%s): UNSPEC\n", addr);
2011 	return AF_UNSPEC;
2012 }
2013 
2014 /*
2015 **  CHKCLIENTMODIFIERS -- check whether all clients have set a flag.
2016 **
2017 **	Parameters:
2018 **		flag -- the flag to test.
2019 **
2020 **	Returns:
2021 **		true iff all configured clients have set the flag.
2022 */
2023 
2024 bool
chkclientmodifiers(flag)2025 chkclientmodifiers(flag)
2026 	int flag;
2027 {
2028 	int i;
2029 	bool flagisset;
2030 
2031 	flagisset = false;
2032 	for (i = 0; i < AF_MAX; i++)
2033 	{
2034 		if (bitnset(D_ISSET, ClientSettings[i].d_flags))
2035 		{
2036 			if (!bitnset((char) flag, ClientSettings[i].d_flags))
2037 				return false;
2038 			flagisset = true;
2039 		}
2040 	}
2041 	return flagisset;
2042 }
2043 
2044 #if MILTER
2045 /*
2046 **  SETUP_DAEMON_FILTERS -- Parse per-socket filters
2047 **
2048 **	Parameters:
2049 **		none
2050 **
2051 **	Returns:
2052 **		none
2053 */
2054 
2055 void
setup_daemon_milters()2056 setup_daemon_milters()
2057 {
2058 	int idx;
2059 
2060 	if (OpMode == MD_SMTP)
2061 	{
2062 		/* no need to configure the daemons */
2063 		return;
2064 	}
2065 
2066 	for (idx = 0; idx < NDaemons; idx++)
2067 	{
2068 		if (Daemons[idx].d_inputfilterlist != NULL)
2069 		{
2070 			milter_config(Daemons[idx].d_inputfilterlist,
2071 				      Daemons[idx].d_inputfilters,
2072 				      MAXFILTERS);
2073 		}
2074 	}
2075 }
2076 #endif /* MILTER */
2077 /*
2078 **  MAKECONNECTION -- make a connection to an SMTP socket on a machine.
2079 **
2080 **	Parameters:
2081 **		host -- the name of the host.
2082 **		port -- the port number to connect to.
2083 **		mci -- a pointer to the mail connection information
2084 **			structure to be filled in.
2085 **		e -- the current envelope.
2086 **		enough -- time at which to stop further connection attempts.
2087 **			(0 means no limit)
2088 **
2089 **	Returns:
2090 **		An exit code telling whether the connection could be
2091 **			made and if not why not.
2092 **
2093 **	Side Effects:
2094 **		none.
2095 */
2096 
2097 static jmp_buf	CtxConnectTimeout;
2098 
2099 SOCKADDR	CurHostAddr;		/* address of current host */
2100 
2101 int
makeconnection(host,port,mci,e,enough)2102 makeconnection(host, port, mci, e, enough)
2103 	char *host;
2104 	volatile unsigned int port;
2105 	register MCI *mci;
2106 	ENVELOPE *e;
2107 	time_t enough;
2108 {
2109 	register volatile int addrno = 0;
2110 	volatile int s;
2111 	register struct hostent *volatile hp = (struct hostent *) NULL;
2112 	SOCKADDR addr;
2113 	SOCKADDR clt_addr;
2114 	int save_errno = 0;
2115 	volatile SOCKADDR_LEN_T addrlen;
2116 	volatile bool firstconnect = true;
2117 	SM_EVENT *volatile ev = NULL;
2118 #if NETINET6
2119 	volatile bool v6found = false;
2120 #endif /* NETINET6 */
2121 	volatile int family = InetMode;
2122 	SOCKADDR_LEN_T len;
2123 	volatile SOCKADDR_LEN_T socksize = 0;
2124 	volatile bool clt_bind;
2125 	BITMAP256 d_flags;
2126 	char *p;
2127 	extern ENVELOPE BlankEnvelope;
2128 
2129 	/* retranslate {daemon_flags} into bitmap */
2130 	clrbitmap(d_flags);
2131 	if ((p = macvalue(macid("{daemon_flags}"), e)) != NULL)
2132 	{
2133 		for (; *p != '\0'; p++)
2134 		{
2135 			if (!(isascii(*p) && isspace(*p)))
2136 				setbitn(bitidx(*p), d_flags);
2137 		}
2138 	}
2139 
2140 #if NETINET6
2141  v4retry:
2142 #endif /* NETINET6 */
2143 	clt_bind = false;
2144 
2145 	/* Set up the address for outgoing connection. */
2146 	if (bitnset(D_BINDIF, d_flags) &&
2147 	    (p = macvalue(macid("{if_addr}"), e)) != NULL &&
2148 	    *p != '\0')
2149 	{
2150 #if NETINET6
2151 		char p6[INET6_ADDRSTRLEN];
2152 #endif /* NETINET6 */
2153 
2154 		memset(&clt_addr, '\0', sizeof(clt_addr));
2155 
2156 		/* infer the address family from the address itself */
2157 		clt_addr.sa.sa_family = addr_family(p);
2158 		switch (clt_addr.sa.sa_family)
2159 		{
2160 #if NETINET
2161 		  case AF_INET:
2162 			clt_addr.sin.sin_addr.s_addr = inet_addr(p);
2163 			if (clt_addr.sin.sin_addr.s_addr != INADDR_NONE &&
2164 			    clt_addr.sin.sin_addr.s_addr !=
2165 				htonl(INADDR_LOOPBACK))
2166 			{
2167 				clt_bind = true;
2168 				socksize = sizeof(struct sockaddr_in);
2169 			}
2170 			break;
2171 #endif /* NETINET */
2172 
2173 #if NETINET6
2174 		  case AF_INET6:
2175 			if (inet_addr(p) != INADDR_NONE)
2176 				(void) sm_snprintf(p6, sizeof(p6),
2177 						   "IPv6:::ffff:%s", p);
2178 			else
2179 				(void) sm_strlcpy(p6, p, sizeof(p6));
2180 			if (anynet_pton(AF_INET6, p6,
2181 					&clt_addr.sin6.sin6_addr) == 1 &&
2182 			    !IN6_IS_ADDR_LOOPBACK(&clt_addr.sin6.sin6_addr))
2183 			{
2184 				clt_bind = true;
2185 				socksize = sizeof(struct sockaddr_in6);
2186 			}
2187 			break;
2188 #endif /* NETINET6 */
2189 
2190 #if 0
2191 		  default:
2192 			syserr("554 5.3.5 Address= option unsupported for family %d",
2193 			       clt_addr.sa.sa_family);
2194 			break;
2195 #endif /* 0 */
2196 		}
2197 		if (clt_bind)
2198 			family = clt_addr.sa.sa_family;
2199 	}
2200 
2201 	/* D_BINDIF not set or not available, fallback to ClientPortOptions */
2202 	if (!clt_bind)
2203 	{
2204 		STRUCTCOPY(ClientSettings[family].d_addr, clt_addr);
2205 		switch (clt_addr.sa.sa_family)
2206 		{
2207 #if NETINET
2208 		  case AF_INET:
2209 			if (clt_addr.sin.sin_addr.s_addr == 0)
2210 				clt_addr.sin.sin_addr.s_addr = LocalDaemon ?
2211 					htonl(INADDR_LOOPBACK) : INADDR_ANY;
2212 			else
2213 				clt_bind = true;
2214 			if (clt_addr.sin.sin_port != 0)
2215 				clt_bind = true;
2216 			socksize = sizeof(struct sockaddr_in);
2217 			break;
2218 #endif /* NETINET */
2219 #if NETINET6
2220 		  case AF_INET6:
2221 			if (IN6_IS_ADDR_UNSPECIFIED(&clt_addr.sin6.sin6_addr))
2222 				clt_addr.sin6.sin6_addr = LocalDaemon ?
2223 					in6addr_loopback : in6addr_any;
2224 			else
2225 				clt_bind = true;
2226 			socksize = sizeof(struct sockaddr_in6);
2227 			if (clt_addr.sin6.sin6_port != 0)
2228 				clt_bind = true;
2229 			break;
2230 #endif /* NETINET6 */
2231 #if NETISO
2232 		  case AF_ISO:
2233 			socksize = sizeof(clt_addr.siso);
2234 			clt_bind = true;
2235 			break;
2236 #endif /* NETISO */
2237 		  default:
2238 			break;
2239 		}
2240 	}
2241 
2242 	/*
2243 	**  Set up the address for the mailer.
2244 	**	Accept "[a.b.c.d]" syntax for host name.
2245 	*/
2246 
2247 	SM_SET_H_ERRNO(0);
2248 	errno = 0;
2249 	memset(&CurHostAddr, '\0', sizeof(CurHostAddr));
2250 	memset(&addr, '\0', sizeof(addr));
2251 	SmtpPhase = mci->mci_phase = "initial connection";
2252 	CurHostName = host;
2253 
2254 	if (host[0] == '[')
2255 	{
2256 		p = strchr(host, ']');
2257 		if (p != NULL)
2258 		{
2259 #if NETINET
2260 			unsigned long hid = INADDR_NONE;
2261 #endif /* NETINET */
2262 #if NETINET6
2263 			struct sockaddr_in6 hid6;
2264 #endif /* NETINET6 */
2265 
2266 			*p = '\0';
2267 #if NETINET6
2268 			memset(&hid6, '\0', sizeof(hid6));
2269 #endif /* NETINET6 */
2270 #if NETINET
2271 			if (family == AF_INET &&
2272 			    (hid = inet_addr(&host[1])) != INADDR_NONE)
2273 			{
2274 				addr.sin.sin_family = AF_INET;
2275 				addr.sin.sin_addr.s_addr = hid;
2276 			}
2277 			else
2278 #endif /* NETINET */
2279 #if NETINET6
2280 			if (family == AF_INET6 &&
2281 			    anynet_pton(AF_INET6, &host[1],
2282 					&hid6.sin6_addr) == 1)
2283 			{
2284 				addr.sin6.sin6_family = AF_INET6;
2285 				addr.sin6.sin6_addr = hid6.sin6_addr;
2286 			}
2287 			else
2288 #endif /* NETINET6 */
2289 			{
2290 				/* try it as a host name (avoid MX lookup) */
2291 				hp = sm_gethostbyname(&host[1], family);
2292 				if (hp == NULL && p[-1] == '.')
2293 				{
2294 #if NAMED_BIND
2295 					int oldopts = _res.options;
2296 
2297 					_res.options &= ~(RES_DEFNAMES|RES_DNSRCH);
2298 #endif /* NAMED_BIND */
2299 					p[-1] = '\0';
2300 					hp = sm_gethostbyname(&host[1],
2301 							      family);
2302 					p[-1] = '.';
2303 #if NAMED_BIND
2304 					_res.options = oldopts;
2305 #endif /* NAMED_BIND */
2306 				}
2307 				*p = ']';
2308 				goto gothostent;
2309 			}
2310 			*p = ']';
2311 		}
2312 		if (p == NULL)
2313 		{
2314 			extern char MsgBuf[];
2315 
2316 			usrerrenh("5.1.2",
2317 				  "553 Invalid numeric domain spec \"%s\"",
2318 				  host);
2319 			mci_setstat(mci, EX_NOHOST, "5.1.2", MsgBuf);
2320 			errno = EINVAL;
2321 			return EX_NOHOST;
2322 		}
2323 	}
2324 	else
2325 	{
2326 		/* contortion to get around SGI cc complaints */
2327 		{
2328 			p = &host[strlen(host) - 1];
2329 			hp = sm_gethostbyname(host, family);
2330 			if (hp == NULL && *p == '.')
2331 			{
2332 #if NAMED_BIND
2333 				int oldopts = _res.options;
2334 
2335 				_res.options &= ~(RES_DEFNAMES|RES_DNSRCH);
2336 #endif /* NAMED_BIND */
2337 				*p = '\0';
2338 				hp = sm_gethostbyname(host, family);
2339 				*p = '.';
2340 #if NAMED_BIND
2341 				_res.options = oldopts;
2342 #endif /* NAMED_BIND */
2343 			}
2344 		}
2345 gothostent:
2346 		if (hp == NULL || hp->h_addr == NULL)
2347 		{
2348 #if NAMED_BIND
2349 			/* check for name server timeouts */
2350 # if NETINET6
2351 			if (WorkAroundBrokenAAAA && family == AF_INET6 &&
2352 			    errno == ETIMEDOUT)
2353 			{
2354 				/*
2355 				**  An attempt with family AF_INET may
2356 				**  succeed By skipping the next section
2357 				**  of code, we will try AF_INET before
2358 				**  failing.
2359 				*/
2360 
2361 				if (tTd(16, 10))
2362 					sm_dprintf("makeconnection: WorkAroundBrokenAAAA: Trying AF_INET lookup (AF_INET6 failed)\n");
2363 			}
2364 			else
2365 # endif /* NETINET6 */
2366 			{
2367 				if (errno == ETIMEDOUT ||
2368 # if _FFR_GETHBN_ExFILE
2369 #  ifdef EMFILE
2370 				   errno == EMFILE ||
2371 #  endif /* EMFILE */
2372 #  ifdef ENFILE
2373 				   errno == ENFILE ||
2374 #  endif /* ENFILE */
2375 # endif /* _FFR_GETHBN_ExFILE */
2376 				    h_errno == TRY_AGAIN ||
2377 				    (errno == ECONNREFUSED && UseNameServer))
2378 				{
2379 					save_errno = errno;
2380 					mci_setstat(mci, EX_TEMPFAIL,
2381 						    "4.4.3", NULL);
2382 					errno = save_errno;
2383 					return EX_TEMPFAIL;
2384 				}
2385 			}
2386 #endif /* NAMED_BIND */
2387 #if NETINET6
2388 			/*
2389 			**  Try v6 first, then fall back to v4.
2390 			**  If we found a v6 address, but no v4
2391 			**  addresses, then TEMPFAIL.
2392 			*/
2393 
2394 			if (family == AF_INET6)
2395 			{
2396 				family = AF_INET;
2397 				goto v4retry;
2398 			}
2399 			if (v6found)
2400 				goto v6tempfail;
2401 #endif /* NETINET6 */
2402 			save_errno = errno;
2403 			mci_setstat(mci, EX_NOHOST, "5.1.2", NULL);
2404 			errno = save_errno;
2405 			return EX_NOHOST;
2406 		}
2407 		addr.sa.sa_family = hp->h_addrtype;
2408 		switch (hp->h_addrtype)
2409 		{
2410 #if NETINET
2411 		  case AF_INET:
2412 			memmove(&addr.sin.sin_addr,
2413 				hp->h_addr,
2414 				INADDRSZ);
2415 			break;
2416 #endif /* NETINET */
2417 
2418 #if NETINET6
2419 		  case AF_INET6:
2420 			memmove(&addr.sin6.sin6_addr,
2421 				hp->h_addr,
2422 				IN6ADDRSZ);
2423 			break;
2424 #endif /* NETINET6 */
2425 
2426 		  default:
2427 			if (hp->h_length > sizeof(addr.sa.sa_data))
2428 			{
2429 				syserr("makeconnection: long sa_data: family %d len %d",
2430 					hp->h_addrtype, hp->h_length);
2431 				mci_setstat(mci, EX_NOHOST, "5.1.2", NULL);
2432 				errno = EINVAL;
2433 				return EX_NOHOST;
2434 			}
2435 			memmove(addr.sa.sa_data, hp->h_addr, hp->h_length);
2436 			break;
2437 		}
2438 		addrno = 1;
2439 	}
2440 
2441 	/*
2442 	**  Determine the port number.
2443 	*/
2444 
2445 	if (port == 0)
2446 	{
2447 #ifdef NO_GETSERVBYNAME
2448 		port = htons(25);
2449 #else /* NO_GETSERVBYNAME */
2450 		register struct servent *sp = getservbyname("smtp", "tcp");
2451 
2452 		if (sp == NULL)
2453 		{
2454 			if (LogLevel > 2)
2455 				sm_syslog(LOG_ERR, NOQID,
2456 					  "makeconnection: service \"smtp\" unknown");
2457 			port = htons(25);
2458 		}
2459 		else
2460 			port = sp->s_port;
2461 #endif /* NO_GETSERVBYNAME */
2462 	}
2463 
2464 #if NETINET6
2465 	if (addr.sa.sa_family == AF_INET6 &&
2466 	    IN6_IS_ADDR_V4MAPPED(&addr.sin6.sin6_addr) &&
2467 	    ClientSettings[AF_INET].d_addr.sa.sa_family != 0)
2468 	{
2469 		/*
2470 		**  Ignore mapped IPv4 address since
2471 		**  there is a ClientPortOptions setting
2472 		**  for IPv4.
2473 		*/
2474 
2475 		goto nextaddr;
2476 	}
2477 #endif /* NETINET6 */
2478 
2479 	switch (addr.sa.sa_family)
2480 	{
2481 #if NETINET
2482 	  case AF_INET:
2483 		addr.sin.sin_port = port;
2484 		addrlen = sizeof(struct sockaddr_in);
2485 		break;
2486 #endif /* NETINET */
2487 
2488 #if NETINET6
2489 	  case AF_INET6:
2490 		addr.sin6.sin6_port = port;
2491 		addrlen = sizeof(struct sockaddr_in6);
2492 		break;
2493 #endif /* NETINET6 */
2494 
2495 #if NETISO
2496 	  case AF_ISO:
2497 		/* assume two byte transport selector */
2498 		memmove(TSEL((struct sockaddr_iso *) &addr), (char *) &port, 2);
2499 		addrlen = sizeof(struct sockaddr_iso);
2500 		break;
2501 #endif /* NETISO */
2502 
2503 	  default:
2504 		syserr("Can't connect to address family %d", addr.sa.sa_family);
2505 		mci_setstat(mci, EX_NOHOST, "5.1.2", NULL);
2506 		errno = EINVAL;
2507 #if NETINET6
2508 		if (hp != NULL)
2509 			freehostent(hp);
2510 #endif /* NETINET6 */
2511 		return EX_NOHOST;
2512 	}
2513 
2514 	/*
2515 	**  Try to actually open the connection.
2516 	*/
2517 
2518 #if XLA
2519 	/* if too many connections, don't bother trying */
2520 	if (!xla_noqueue_ok(host))
2521 	{
2522 # if NETINET6
2523 		if (hp != NULL)
2524 			freehostent(hp);
2525 # endif /* NETINET6 */
2526 		return EX_TEMPFAIL;
2527 	}
2528 #endif /* XLA */
2529 
2530 	for (;;)
2531 	{
2532 		if (tTd(16, 1))
2533 			sm_dprintf("makeconnection (%s [%s].%d (%d))\n",
2534 				   host, anynet_ntoa(&addr), ntohs(port),
2535 				   (int) addr.sa.sa_family);
2536 
2537 		/* save for logging */
2538 		CurHostAddr = addr;
2539 
2540 #if HASRRESVPORT
2541 		if (bitnset(M_SECURE_PORT, mci->mci_mailer->m_flags))
2542 		{
2543 			int rport = IPPORT_RESERVED - 1;
2544 
2545 			s = rresvport(&rport);
2546 		}
2547 		else
2548 #endif /* HASRRESVPORT */
2549 		{
2550 			s = socket(addr.sa.sa_family, SOCK_STREAM, 0);
2551 		}
2552 		if (s < 0)
2553 		{
2554 			save_errno = errno;
2555 			syserr("makeconnection: cannot create socket");
2556 #if XLA
2557 			xla_host_end(host);
2558 #endif /* XLA */
2559 			mci_setstat(mci, EX_TEMPFAIL, "4.4.5", NULL);
2560 #if NETINET6
2561 			if (hp != NULL)
2562 				freehostent(hp);
2563 #endif /* NETINET6 */
2564 			errno = save_errno;
2565 			return EX_TEMPFAIL;
2566 		}
2567 
2568 #ifdef SO_SNDBUF
2569 		if (ClientSettings[family].d_tcpsndbufsize > 0)
2570 		{
2571 			if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
2572 				       (char *) &ClientSettings[family].d_tcpsndbufsize,
2573 				       sizeof(ClientSettings[family].d_tcpsndbufsize)) < 0)
2574 				syserr("makeconnection: setsockopt(SO_SNDBUF)");
2575 		}
2576 #endif /* SO_SNDBUF */
2577 #ifdef SO_RCVBUF
2578 		if (ClientSettings[family].d_tcprcvbufsize > 0)
2579 		{
2580 			if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
2581 				       (char *) &ClientSettings[family].d_tcprcvbufsize,
2582 				       sizeof(ClientSettings[family].d_tcprcvbufsize)) < 0)
2583 				syserr("makeconnection: setsockopt(SO_RCVBUF)");
2584 		}
2585 #endif /* SO_RCVBUF */
2586 
2587 		if (tTd(16, 1))
2588 			sm_dprintf("makeconnection: fd=%d\n", s);
2589 
2590 		/* turn on network debugging? */
2591 		if (tTd(16, 101))
2592 		{
2593 			int on = 1;
2594 
2595 			(void) setsockopt(s, SOL_SOCKET, SO_DEBUG,
2596 					  (char *)&on, sizeof(on));
2597 		}
2598 		if (e->e_xfp != NULL)	/* for debugging */
2599 			(void) sm_io_flush(e->e_xfp, SM_TIME_DEFAULT);
2600 		errno = 0;		/* for debugging */
2601 
2602 		if (clt_bind)
2603 		{
2604 			int on = 1;
2605 
2606 			switch (clt_addr.sa.sa_family)
2607 			{
2608 #if NETINET
2609 			  case AF_INET:
2610 				if (clt_addr.sin.sin_port != 0)
2611 					(void) setsockopt(s, SOL_SOCKET,
2612 							  SO_REUSEADDR,
2613 							  (char *) &on,
2614 							  sizeof(on));
2615 				break;
2616 #endif /* NETINET */
2617 
2618 #if NETINET6
2619 			  case AF_INET6:
2620 				if (clt_addr.sin6.sin6_port != 0)
2621 					(void) setsockopt(s, SOL_SOCKET,
2622 							  SO_REUSEADDR,
2623 							  (char *) &on,
2624 							  sizeof(on));
2625 				break;
2626 #endif /* NETINET6 */
2627 			}
2628 
2629 			if (bind(s, &clt_addr.sa, socksize) < 0)
2630 			{
2631 				save_errno = errno;
2632 				(void) close(s);
2633 				errno = save_errno;
2634 				syserr("makeconnection: cannot bind socket [%s]",
2635 				       anynet_ntoa(&clt_addr));
2636 #if NETINET6
2637 				if (hp != NULL)
2638 					freehostent(hp);
2639 #endif /* NETINET6 */
2640 				errno = save_errno;
2641 				return EX_TEMPFAIL;
2642 			}
2643 		}
2644 
2645 		/*
2646 		**  Linux seems to hang in connect for 90 minutes (!!!).
2647 		**  Time out the connect to avoid this problem.
2648 		*/
2649 
2650 		if (setjmp(CtxConnectTimeout) == 0)
2651 		{
2652 			int i;
2653 
2654 			if (e->e_ntries <= 0 && TimeOuts.to_iconnect != 0)
2655 				ev = sm_setevent(TimeOuts.to_iconnect,
2656 						 connecttimeout, 0);
2657 			else if (TimeOuts.to_connect != 0)
2658 				ev = sm_setevent(TimeOuts.to_connect,
2659 						 connecttimeout, 0);
2660 			else
2661 				ev = NULL;
2662 
2663 			switch (ConnectOnlyTo.sa.sa_family)
2664 			{
2665 #if NETINET
2666 			  case AF_INET:
2667 				addr.sin.sin_addr.s_addr = ConnectOnlyTo.sin.sin_addr.s_addr;
2668 				break;
2669 #endif /* NETINET */
2670 
2671 #if NETINET6
2672 			  case AF_INET6:
2673 				memmove(&addr.sin6.sin6_addr,
2674 					&ConnectOnlyTo.sin6.sin6_addr,
2675 					IN6ADDRSZ);
2676 				break;
2677 #endif /* NETINET6 */
2678 			}
2679 			if (tTd(16, 1))
2680 				sm_dprintf("Connecting to [%s]...\n", anynet_ntoa(&addr));
2681 			i = connect(s, (struct sockaddr *) &addr, addrlen);
2682 			save_errno = errno;
2683 			if (ev != NULL)
2684 				sm_clrevent(ev);
2685 			if (i >= 0)
2686 				break;
2687 		}
2688 		else
2689 			save_errno = errno;
2690 
2691 		/* couldn't connect.... figure out why */
2692 		(void) close(s);
2693 
2694 		/* if running demand-dialed connection, try again */
2695 		if (DialDelay > 0 && firstconnect &&
2696 		    bitnset(M_DIALDELAY, mci->mci_mailer->m_flags))
2697 		{
2698 			if (tTd(16, 1))
2699 				sm_dprintf("Connect failed (%s); trying again...\n",
2700 					   sm_errstring(save_errno));
2701 			firstconnect = false;
2702 			(void) sleep(DialDelay);
2703 			continue;
2704 		}
2705 
2706 		if (LogLevel > 13)
2707 			sm_syslog(LOG_INFO, e->e_id,
2708 				  "makeconnection (%s [%s]) failed: %s",
2709 				  host, anynet_ntoa(&addr),
2710 				  sm_errstring(save_errno));
2711 
2712 #if NETINET6
2713 nextaddr:
2714 #endif /* NETINET6 */
2715 		if (hp != NULL && hp->h_addr_list[addrno] != NULL &&
2716 		    (enough == 0 || curtime() < enough))
2717 		{
2718 			if (tTd(16, 1))
2719 				sm_dprintf("Connect failed (%s); trying new address....\n",
2720 					   sm_errstring(save_errno));
2721 			switch (addr.sa.sa_family)
2722 			{
2723 #if NETINET
2724 			  case AF_INET:
2725 				memmove(&addr.sin.sin_addr,
2726 					hp->h_addr_list[addrno++],
2727 					INADDRSZ);
2728 				break;
2729 #endif /* NETINET */
2730 
2731 #if NETINET6
2732 			  case AF_INET6:
2733 				memmove(&addr.sin6.sin6_addr,
2734 					hp->h_addr_list[addrno++],
2735 					IN6ADDRSZ);
2736 				break;
2737 #endif /* NETINET6 */
2738 
2739 			  default:
2740 				memmove(addr.sa.sa_data,
2741 					hp->h_addr_list[addrno++],
2742 					hp->h_length);
2743 				break;
2744 			}
2745 			continue;
2746 		}
2747 		errno = save_errno;
2748 
2749 #if NETINET6
2750 		if (family == AF_INET6)
2751 		{
2752 			if (tTd(16, 1))
2753 				sm_dprintf("Connect failed (%s); retrying with AF_INET....\n",
2754 					   sm_errstring(save_errno));
2755 			v6found = true;
2756 			family = AF_INET;
2757 			if (hp != NULL)
2758 			{
2759 				freehostent(hp);
2760 				hp = NULL;
2761 			}
2762 			goto v4retry;
2763 		}
2764 	v6tempfail:
2765 #endif /* NETINET6 */
2766 		/* couldn't open connection */
2767 #if NETINET6
2768 		/* Don't clobber an already saved errno from v4retry */
2769 		if (errno > 0)
2770 #endif /* NETINET6 */
2771 			save_errno = errno;
2772 		if (tTd(16, 1))
2773 			sm_dprintf("Connect failed (%s)\n",
2774 				   sm_errstring(save_errno));
2775 #if XLA
2776 		xla_host_end(host);
2777 #endif /* XLA */
2778 		mci_setstat(mci, EX_TEMPFAIL, "4.4.1", NULL);
2779 #if NETINET6
2780 		if (hp != NULL)
2781 			freehostent(hp);
2782 #endif /* NETINET6 */
2783 		errno = save_errno;
2784 		return EX_TEMPFAIL;
2785 	}
2786 
2787 #if NETINET6
2788 	if (hp != NULL)
2789 	{
2790 		freehostent(hp);
2791 		hp = NULL;
2792 	}
2793 #endif /* NETINET6 */
2794 
2795 	/* connection ok, put it into canonical form */
2796 	mci->mci_out = NULL;
2797 	if ((mci->mci_out = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT,
2798 				       (void *) &s,
2799 				       SM_IO_WRONLY_B, NULL)) == NULL ||
2800 	    (s = dup(s)) < 0 ||
2801 	    (mci->mci_in = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT,
2802 				      (void *) &s,
2803 				      SM_IO_RDONLY_B, NULL)) == NULL)
2804 	{
2805 		save_errno = errno;
2806 		syserr("cannot open SMTP client channel, fd=%d", s);
2807 		mci_setstat(mci, EX_TEMPFAIL, "4.4.5", NULL);
2808 		if (mci->mci_out != NULL)
2809 			(void) sm_io_close(mci->mci_out, SM_TIME_DEFAULT);
2810 		(void) close(s);
2811 		errno = save_errno;
2812 		return EX_TEMPFAIL;
2813 	}
2814 	sm_io_automode(mci->mci_out, mci->mci_in);
2815 
2816 	/* set {client_flags} */
2817 	if (ClientSettings[addr.sa.sa_family].d_mflags != NULL)
2818 	{
2819 		macdefine(&mci->mci_macro, A_PERM,
2820 			  macid("{client_flags}"),
2821 			  ClientSettings[addr.sa.sa_family].d_mflags);
2822 	}
2823 	else
2824 		macdefine(&mci->mci_macro, A_PERM,
2825 			  macid("{client_flags}"), "");
2826 
2827 	/* "add" {client_flags} to bitmap */
2828 	if (bitnset(D_IFNHELO, ClientSettings[addr.sa.sa_family].d_flags))
2829 	{
2830 		/* look for just this one flag */
2831 		setbitn(D_IFNHELO, d_flags);
2832 	}
2833 
2834 	/* find out name for Interface through which we connect */
2835 	len = sizeof(addr);
2836 	if (getsockname(s, &addr.sa, &len) == 0)
2837 	{
2838 		char *name;
2839 		char family[5];
2840 
2841 		macdefine(&BlankEnvelope.e_macro, A_TEMP,
2842 			macid("{if_addr_out}"), anynet_ntoa(&addr));
2843 		(void) sm_snprintf(family, sizeof(family), "%d",
2844 			addr.sa.sa_family);
2845 		macdefine(&BlankEnvelope.e_macro, A_TEMP,
2846 			macid("{if_family_out}"), family);
2847 
2848 		name = hostnamebyanyaddr(&addr);
2849 		macdefine(&BlankEnvelope.e_macro, A_TEMP,
2850 			macid("{if_name_out}"), name);
2851 		if (LogLevel > 11)
2852 		{
2853 			/* log connection information */
2854 			sm_syslog(LOG_INFO, e->e_id,
2855 				  "SMTP outgoing connect on %.40s", name);
2856 		}
2857 		if (bitnset(D_IFNHELO, d_flags))
2858 		{
2859 			if (name[0] != '[' && strchr(name, '.') != NULL)
2860 				mci->mci_heloname = newstr(name);
2861 		}
2862 	}
2863 	else
2864 	{
2865 		macdefine(&BlankEnvelope.e_macro, A_PERM,
2866 			macid("{if_name_out}"), NULL);
2867 		macdefine(&BlankEnvelope.e_macro, A_PERM,
2868 			macid("{if_addr_out}"), NULL);
2869 		macdefine(&BlankEnvelope.e_macro, A_PERM,
2870 			macid("{if_family_out}"), NULL);
2871 	}
2872 
2873 	/* Use the configured HeloName as appropriate */
2874 	if (HeloName != NULL && HeloName[0] != '\0')
2875 		mci->mci_heloname = newstr(HeloName);
2876 
2877 	mci_setstat(mci, EX_OK, NULL, NULL);
2878 	return EX_OK;
2879 }
2880 
2881 static void
connecttimeout(ignore)2882 connecttimeout(ignore)
2883 	int ignore;
2884 {
2885 	/*
2886 	**  NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER.  DO NOT ADD
2887 	**	ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE
2888 	**	DOING.
2889 	*/
2890 
2891 	errno = ETIMEDOUT;
2892 	longjmp(CtxConnectTimeout, 1);
2893 }
2894 /*
2895 **  MAKECONNECTION_DS -- make a connection to a domain socket.
2896 **
2897 **	Parameters:
2898 **		mux_path -- the path of the socket to connect to.
2899 **		mci -- a pointer to the mail connection information
2900 **			structure to be filled in.
2901 **
2902 **	Returns:
2903 **		An exit code telling whether the connection could be
2904 **			made and if not why not.
2905 **
2906 **	Side Effects:
2907 **		none.
2908 */
2909 
2910 #if NETUNIX
2911 int
makeconnection_ds(mux_path,mci)2912 makeconnection_ds(mux_path, mci)
2913 	char *mux_path;
2914 	register MCI *mci;
2915 {
2916 	int sock;
2917 	int rval, save_errno;
2918 	long sff = SFF_SAFEDIRPATH|SFF_OPENASROOT|SFF_NOLINK|SFF_ROOTOK|SFF_EXECOK;
2919 	struct sockaddr_un unix_addr;
2920 
2921 	/* if not safe, don't connect */
2922 	rval = safefile(mux_path, RunAsUid, RunAsGid, RunAsUserName,
2923 			sff, S_IRUSR|S_IWUSR, NULL);
2924 
2925 	if (rval != 0)
2926 	{
2927 		syserr("makeconnection_ds: unsafe domain socket %s",
2928 			mux_path);
2929 		mci_setstat(mci, EX_TEMPFAIL, "4.3.5", NULL);
2930 		errno = rval;
2931 		return EX_TEMPFAIL;
2932 	}
2933 
2934 	/* prepare address structure */
2935 	memset(&unix_addr, '\0', sizeof(unix_addr));
2936 	unix_addr.sun_family = AF_UNIX;
2937 
2938 	if (strlen(mux_path) >= sizeof(unix_addr.sun_path))
2939 	{
2940 		syserr("makeconnection_ds: domain socket name %s too long",
2941 			mux_path);
2942 
2943 		/* XXX why TEMPFAIL but 5.x.y ? */
2944 		mci_setstat(mci, EX_TEMPFAIL, "5.3.5", NULL);
2945 		errno = ENAMETOOLONG;
2946 		return EX_UNAVAILABLE;
2947 	}
2948 	(void) sm_strlcpy(unix_addr.sun_path, mux_path,
2949 			  sizeof(unix_addr.sun_path));
2950 
2951 	/* initialize domain socket */
2952 	sock = socket(AF_UNIX, SOCK_STREAM, 0);
2953 	if (sock == -1)
2954 	{
2955 		save_errno = errno;
2956 		syserr("makeconnection_ds: could not create domain socket %s",
2957 			mux_path);
2958 		mci_setstat(mci, EX_TEMPFAIL, "4.4.5", NULL);
2959 		errno = save_errno;
2960 		return EX_TEMPFAIL;
2961 	}
2962 
2963 	/* connect to server */
2964 	if (connect(sock, (struct sockaddr *) &unix_addr,
2965 		    sizeof(unix_addr)) == -1)
2966 	{
2967 		save_errno = errno;
2968 		syserr("Could not connect to socket %s", mux_path);
2969 		mci_setstat(mci, EX_TEMPFAIL, "4.4.1", NULL);
2970 		(void) close(sock);
2971 		errno = save_errno;
2972 		return EX_TEMPFAIL;
2973 	}
2974 
2975 	/* connection ok, put it into canonical form */
2976 	mci->mci_out = NULL;
2977 	if ((mci->mci_out = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT,
2978 				       (void *) &sock, SM_IO_WRONLY_B, NULL))
2979 					== NULL
2980 	    || (sock = dup(sock)) < 0 ||
2981 	    (mci->mci_in = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT,
2982 				      (void *) &sock, SM_IO_RDONLY_B, NULL))
2983 					== NULL)
2984 	{
2985 		save_errno = errno;
2986 		syserr("cannot open SMTP client channel, fd=%d", sock);
2987 		mci_setstat(mci, EX_TEMPFAIL, "4.4.5", NULL);
2988 		if (mci->mci_out != NULL)
2989 			(void) sm_io_close(mci->mci_out, SM_TIME_DEFAULT);
2990 		(void) close(sock);
2991 		errno = save_errno;
2992 		return EX_TEMPFAIL;
2993 	}
2994 	sm_io_automode(mci->mci_out, mci->mci_in);
2995 
2996 	mci_setstat(mci, EX_OK, NULL, NULL);
2997 	errno = 0;
2998 	return EX_OK;
2999 }
3000 #endif /* NETUNIX */
3001 /*
3002 **  SHUTDOWN_DAEMON -- Performs a clean shutdown of the daemon
3003 **
3004 **	Parameters:
3005 **		none.
3006 **
3007 **	Returns:
3008 **		none.
3009 **
3010 **	Side Effects:
3011 **		closes control socket, exits.
3012 */
3013 
3014 void
shutdown_daemon()3015 shutdown_daemon()
3016 {
3017 	int i;
3018 	char *reason;
3019 
3020 	sm_allsignals(true);
3021 
3022 	reason = ShutdownRequest;
3023 	ShutdownRequest = NULL;
3024 	PendingSignal = 0;
3025 
3026 	if (LogLevel > 9)
3027 		sm_syslog(LOG_INFO, CurEnv->e_id, "stopping daemon, reason=%s",
3028 			  reason == NULL ? "implicit call" : reason);
3029 
3030 	FileName = NULL;
3031 	closecontrolsocket(true);
3032 #if XLA
3033 	xla_all_end();
3034 #endif /* XLA */
3035 
3036 	for (i = 0; i < NDaemons; i++)
3037 	{
3038 		if (Daemons[i].d_socket >= 0)
3039 		{
3040 			(void) close(Daemons[i].d_socket);
3041 			Daemons[i].d_socket = -1;
3042 
3043 #if _FFR_DAEMON_NETUNIX
3044 # if NETUNIX
3045 			/* Remove named sockets */
3046 			if (Daemons[i].d_addr.sa.sa_family == AF_UNIX)
3047 			{
3048 				int rval;
3049 				long sff = SFF_SAFEDIRPATH|SFF_OPENASROOT|SFF_NOLINK|SFF_MUSTOWN|SFF_EXECOK|SFF_CREAT;
3050 
3051 				/* if not safe, don't use it */
3052 				rval = safefile(Daemons[i].d_addr.sunix.sun_path,
3053 						RunAsUid, RunAsGid,
3054 						RunAsUserName, sff,
3055 						S_IRUSR|S_IWUSR, NULL);
3056 				if (rval == 0 &&
3057 				    unlink(Daemons[i].d_addr.sunix.sun_path) < 0)
3058 				{
3059 					sm_syslog(LOG_WARNING, NOQID,
3060 						  "Could not remove daemon %s socket: %s: %s",
3061 						  Daemons[i].d_name,
3062 						  Daemons[i].d_addr.sunix.sun_path,
3063 						  sm_errstring(errno));
3064 				}
3065 			}
3066 # endif /* NETUNIX */
3067 #endif	/* _FFR_DAEMON_NETUNIX */
3068 		}
3069 	}
3070 
3071 	finis(false, true, EX_OK);
3072 }
3073 /*
3074 **  RESTART_DAEMON -- Performs a clean restart of the daemon
3075 **
3076 **	Parameters:
3077 **		none.
3078 **
3079 **	Returns:
3080 **		none.
3081 **
3082 **	Side Effects:
3083 **		restarts the daemon or exits if restart fails.
3084 */
3085 
3086 /* Make a non-DFL/IGN signal a noop */
3087 #define SM_NOOP_SIGNAL(sig, old)				\
3088 do								\
3089 {								\
3090 	(old) = sm_signal((sig), sm_signal_noop);		\
3091 	if ((old) == SIG_IGN || (old) == SIG_DFL)		\
3092 		(void) sm_signal((sig), (old));			\
3093 } while (0)
3094 
3095 void
restart_daemon()3096 restart_daemon()
3097 {
3098 	bool drop;
3099 	int save_errno;
3100 	char *reason;
3101 	sigfunc_t ignore, oalrm, ousr1;
3102 	extern int DtableSize;
3103 
3104 	/* clear the events to turn off SIGALRMs */
3105 	sm_clear_events();
3106 	sm_allsignals(true);
3107 
3108 	reason = RestartRequest;
3109 	RestartRequest = NULL;
3110 	PendingSignal = 0;
3111 
3112 	if (SaveArgv[0][0] != '/')
3113 	{
3114 		if (LogLevel > 3)
3115 			sm_syslog(LOG_INFO, NOQID,
3116 				  "could not restart: need full path");
3117 		finis(false, true, EX_OSFILE);
3118 		/* NOTREACHED */
3119 	}
3120 	if (LogLevel > 3)
3121 		sm_syslog(LOG_INFO, NOQID, "restarting %s due to %s",
3122 			  SaveArgv[0],
3123 			  reason == NULL ? "implicit call" : reason);
3124 
3125 	closecontrolsocket(true);
3126 #if SM_CONF_SHM
3127 	cleanup_shm(DaemonPid == getpid());
3128 #endif /* SM_CONF_SHM */
3129 
3130 	/* close locked pid file */
3131 	close_sendmail_pid();
3132 
3133 	/*
3134 	**  Want to drop to the user who started the process in all cases
3135 	**  *but* when running as "smmsp" for the clientmqueue queue run
3136 	**  daemon.  In that case, UseMSP will be true, RunAsUid should not
3137 	**  be root, and RealUid should be either 0 or RunAsUid.
3138 	*/
3139 
3140 	drop = !(UseMSP && RunAsUid != 0 &&
3141 		 (RealUid == 0 || RealUid == RunAsUid));
3142 
3143 	if (drop_privileges(drop) != EX_OK)
3144 	{
3145 		if (LogLevel > 0)
3146 			sm_syslog(LOG_ALERT, NOQID,
3147 				  "could not drop privileges: %s",
3148 				  sm_errstring(errno));
3149 		finis(false, true, EX_OSERR);
3150 		/* NOTREACHED */
3151 	}
3152 
3153 	sm_close_on_exec(STDERR_FILENO + 1, DtableSize);
3154 
3155 	/*
3156 	**  Need to allow signals before execve() to make them "harmless".
3157 	**  However, the default action can be "terminate", so it isn't
3158 	**  really harmless.  Setting signals to IGN will cause them to be
3159 	**  ignored in the new process to, so that isn't a good alternative.
3160 	*/
3161 
3162 	SM_NOOP_SIGNAL(SIGALRM, oalrm);
3163 	SM_NOOP_SIGNAL(SIGCHLD, ignore);
3164 	SM_NOOP_SIGNAL(SIGHUP, ignore);
3165 	SM_NOOP_SIGNAL(SIGINT, ignore);
3166 	SM_NOOP_SIGNAL(SIGPIPE, ignore);
3167 	SM_NOOP_SIGNAL(SIGTERM, ignore);
3168 #ifdef SIGUSR1
3169 	SM_NOOP_SIGNAL(SIGUSR1, ousr1);
3170 #endif /* SIGUSR1 */
3171 
3172 	/* Turn back on signals */
3173 	sm_allsignals(false);
3174 
3175 	(void) execve(SaveArgv[0], (ARGV_T) SaveArgv, (ARGV_T) ExternalEnviron);
3176 	save_errno = errno;
3177 
3178 	/* block signals again and restore needed signals */
3179 	sm_allsignals(true);
3180 
3181 	/* For finis() events */
3182 	(void) sm_signal(SIGALRM, oalrm);
3183 
3184 #ifdef SIGUSR1
3185 	/* For debugging finis() */
3186 	(void) sm_signal(SIGUSR1, ousr1);
3187 #endif /* SIGUSR1 */
3188 
3189 	errno = save_errno;
3190 	if (LogLevel > 0)
3191 		sm_syslog(LOG_ALERT, NOQID, "could not exec %s: %s",
3192 			  SaveArgv[0], sm_errstring(errno));
3193 	finis(false, true, EX_OSFILE);
3194 	/* NOTREACHED */
3195 }
3196 /*
3197 **  MYHOSTNAME -- return the name of this host.
3198 **
3199 **	Parameters:
3200 **		hostbuf -- a place to return the name of this host.
3201 **		size -- the size of hostbuf.
3202 **
3203 **	Returns:
3204 **		A list of aliases for this host.
3205 **
3206 **	Side Effects:
3207 **		Adds numeric codes to $=w.
3208 */
3209 
3210 struct hostent *
myhostname(hostbuf,size)3211 myhostname(hostbuf, size)
3212 	char hostbuf[];
3213 	int size;
3214 {
3215 	register struct hostent *hp;
3216 
3217 	if (gethostname(hostbuf, size) < 0 || hostbuf[0] == '\0')
3218 		(void) sm_strlcpy(hostbuf, "localhost", size);
3219 	hp = sm_gethostbyname(hostbuf, InetMode);
3220 #if NETINET && NETINET6
3221 	if (hp == NULL && InetMode == AF_INET6)
3222 	{
3223 		/*
3224 		**  It's possible that this IPv6 enabled machine doesn't
3225 		**  actually have any IPv6 interfaces and, therefore, no
3226 		**  IPv6 addresses.  Fall back to AF_INET.
3227 		*/
3228 
3229 		hp = sm_gethostbyname(hostbuf, AF_INET);
3230 	}
3231 #endif /* NETINET && NETINET6 */
3232 	if (hp == NULL)
3233 		return NULL;
3234 	if (strchr(hp->h_name, '.') != NULL || strchr(hostbuf, '.') == NULL)
3235 		(void) cleanstrcpy(hostbuf, hp->h_name, size);
3236 
3237 #if NETINFO
3238 	if (strchr(hostbuf, '.') == NULL)
3239 	{
3240 		char *domainname;
3241 
3242 		domainname = ni_propval("/locations", NULL, "resolver",
3243 					"domain", '\0');
3244 		if (domainname != NULL &&
3245 		    strlen(domainname) + strlen(hostbuf) + 1 < size)
3246 			(void) sm_strlcat2(hostbuf, ".", domainname, size);
3247 	}
3248 #endif /* NETINFO */
3249 
3250 	/*
3251 	**  If there is still no dot in the name, try looking for a
3252 	**  dotted alias.
3253 	*/
3254 
3255 	if (strchr(hostbuf, '.') == NULL)
3256 	{
3257 		char **ha;
3258 
3259 		for (ha = hp->h_aliases; ha != NULL && *ha != NULL; ha++)
3260 		{
3261 			if (strchr(*ha, '.') != NULL)
3262 			{
3263 				(void) cleanstrcpy(hostbuf, *ha, size - 1);
3264 				hostbuf[size - 1] = '\0';
3265 				break;
3266 			}
3267 		}
3268 	}
3269 
3270 	/*
3271 	**  If _still_ no dot, wait for a while and try again -- it is
3272 	**  possible that some service is starting up.  This can result
3273 	**  in excessive delays if the system is badly configured, but
3274 	**  there really isn't a way around that, particularly given that
3275 	**  the config file hasn't been read at this point.
3276 	**  All in all, a bit of a mess.
3277 	*/
3278 
3279 	if (strchr(hostbuf, '.') == NULL &&
3280 	    !getcanonname(hostbuf, size, true, NULL))
3281 	{
3282 		sm_syslog(LocalDaemon ? LOG_WARNING : LOG_CRIT, NOQID,
3283 			  "My unqualified host name (%s) unknown; sleeping for retry",
3284 			  hostbuf);
3285 		message("My unqualified host name (%s) unknown; sleeping for retry",
3286 			hostbuf);
3287 		(void) sleep(60);
3288 		if (!getcanonname(hostbuf, size, true, NULL))
3289 		{
3290 			sm_syslog(LocalDaemon ? LOG_WARNING : LOG_ALERT, NOQID,
3291 				  "unable to qualify my own domain name (%s) -- using short name",
3292 				  hostbuf);
3293 			message("WARNING: unable to qualify my own domain name (%s) -- using short name",
3294 				hostbuf);
3295 		}
3296 	}
3297 	return hp;
3298 }
3299 /*
3300 **  ADDRCMP -- compare two host addresses
3301 **
3302 **	Parameters:
3303 **		hp -- hostent structure for the first address
3304 **		ha -- actual first address
3305 **		sa -- second address
3306 **
3307 **	Returns:
3308 **		0 -- if ha and sa match
3309 **		else -- they don't match
3310 */
3311 
3312 static int
addrcmp(hp,ha,sa)3313 addrcmp(hp, ha, sa)
3314 	struct hostent *hp;
3315 	char *ha;
3316 	SOCKADDR *sa;
3317 {
3318 #if NETINET6
3319 	unsigned char *a;
3320 #endif /* NETINET6 */
3321 
3322 	switch (sa->sa.sa_family)
3323 	{
3324 #if NETINET
3325 	  case AF_INET:
3326 		if (hp->h_addrtype == AF_INET)
3327 			return memcmp(ha, (char *) &sa->sin.sin_addr, INADDRSZ);
3328 		break;
3329 #endif /* NETINET */
3330 
3331 #if NETINET6
3332 	  case AF_INET6:
3333 		a = (unsigned char *) &sa->sin6.sin6_addr;
3334 
3335 		/* Straight binary comparison */
3336 		if (hp->h_addrtype == AF_INET6)
3337 			return memcmp(ha, a, IN6ADDRSZ);
3338 
3339 		/* If IPv4-mapped IPv6 address, compare the IPv4 section */
3340 		if (hp->h_addrtype == AF_INET &&
3341 		    IN6_IS_ADDR_V4MAPPED(&sa->sin6.sin6_addr))
3342 			return memcmp(a + IN6ADDRSZ - INADDRSZ, ha, INADDRSZ);
3343 		break;
3344 #endif /* NETINET6 */
3345 	}
3346 	return -1;
3347 }
3348 /*
3349 **  GETAUTHINFO -- get the real host name associated with a file descriptor
3350 **
3351 **	Uses RFC1413 protocol to try to get info from the other end.
3352 **
3353 **	Parameters:
3354 **		fd -- the descriptor
3355 **		may_be_forged -- an outage that is set to true if the
3356 **			forward lookup of RealHostName does not match
3357 **			RealHostAddr; set to false if they do match.
3358 **
3359 **	Returns:
3360 **		The user@host information associated with this descriptor.
3361 */
3362 
3363 static jmp_buf	CtxAuthTimeout;
3364 
3365 static void
authtimeout(ignore)3366 authtimeout(ignore)
3367 	int ignore;
3368 {
3369 	/*
3370 	**  NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER.  DO NOT ADD
3371 	**	ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE
3372 	**	DOING.
3373 	*/
3374 
3375 	errno = ETIMEDOUT;
3376 	longjmp(CtxAuthTimeout, 1);
3377 }
3378 
3379 char *
getauthinfo(fd,may_be_forged)3380 getauthinfo(fd, may_be_forged)
3381 	int fd;
3382 	bool *may_be_forged;
3383 {
3384 	unsigned short SM_NONVOLATILE port = 0;
3385 	SOCKADDR_LEN_T falen;
3386 	register char *volatile p = NULL;
3387 	SOCKADDR la;
3388 	SOCKADDR_LEN_T lalen;
3389 #ifndef NO_GETSERVBYNAME
3390 	register struct servent *sp;
3391 # if NETINET
3392 	static unsigned short port4 = 0;
3393 # endif /* NETINET */
3394 # if NETINET6
3395 	static unsigned short port6 = 0;
3396 # endif /* NETINET6 */
3397 #endif /* ! NO_GETSERVBYNAME */
3398 	volatile int s;
3399 	int i = 0;
3400 	size_t len;
3401 	SM_EVENT *ev;
3402 	int nleft;
3403 	struct hostent *hp;
3404 	char *ostype = NULL;
3405 	char **ha;
3406 	char ibuf[MAXNAME + 1];
3407 	static char hbuf[MAXNAME + MAXAUTHINFO + 11];
3408 
3409 	*may_be_forged = false;
3410 	falen = sizeof(RealHostAddr);
3411 	if (isatty(fd) || (i = getpeername(fd, &RealHostAddr.sa, &falen)) < 0 ||
3412 	    falen <= 0 || RealHostAddr.sa.sa_family == 0)
3413 	{
3414 		if (i < 0)
3415 		{
3416 			/*
3417 			**  ENOTSOCK is OK: bail on anything else, but reset
3418 			**  errno in this case, so a mis-report doesn't
3419 			**  happen later.
3420 			*/
3421 
3422 			if (errno != ENOTSOCK)
3423 				return NULL;
3424 			errno = 0;
3425 		}
3426 		(void) sm_strlcpyn(hbuf, sizeof(hbuf), 2, RealUserName,
3427 				   "@localhost");
3428 		if (tTd(9, 1))
3429 			sm_dprintf("getauthinfo: %s\n", hbuf);
3430 		return hbuf;
3431 	}
3432 
3433 	if (RealHostName == NULL)
3434 	{
3435 		/* translate that to a host name */
3436 		RealHostName = newstr(hostnamebyanyaddr(&RealHostAddr));
3437 		if (strlen(RealHostName) > MAXNAME)
3438 			RealHostName[MAXNAME] = '\0'; /* XXX - 1 ? */
3439 	}
3440 
3441 	/* cross check RealHostName with forward DNS lookup */
3442 	if (anynet_ntoa(&RealHostAddr)[0] != '[' &&
3443 	    RealHostName[0] != '[')
3444 	{
3445 		int family;
3446 
3447 		family = RealHostAddr.sa.sa_family;
3448 #if NETINET6 && NEEDSGETIPNODE
3449 		/*
3450 		**  If RealHostAddr is an IPv6 connection with an
3451 		**  IPv4-mapped address, we need RealHostName's IPv4
3452 		**  address(es) for addrcmp() to compare against
3453 		**  RealHostAddr.
3454 		**
3455 		**  Actually, we only need to do this for systems
3456 		**  which NEEDSGETIPNODE since the real getipnodebyname()
3457 		**  already does V4MAPPED address via the AI_V4MAPPEDCFG
3458 		**  flag.  A better fix to this problem is to add this
3459 		**  functionality to our stub getipnodebyname().
3460 		*/
3461 
3462 		if (family == AF_INET6 &&
3463 		    IN6_IS_ADDR_V4MAPPED(&RealHostAddr.sin6.sin6_addr))
3464 			family = AF_INET;
3465 #endif /* NETINET6 && NEEDSGETIPNODE */
3466 
3467 		/* try to match the reverse against the forward lookup */
3468 		hp = sm_gethostbyname(RealHostName, family);
3469 		if (hp == NULL)
3470 		{
3471 			/* XXX: Could be a temporary error on forward lookup */
3472 			*may_be_forged = true;
3473 		}
3474 		else
3475 		{
3476 			for (ha = hp->h_addr_list; *ha != NULL; ha++)
3477 			{
3478 				if (addrcmp(hp, *ha, &RealHostAddr) == 0)
3479 					break;
3480 			}
3481 			*may_be_forged = *ha == NULL;
3482 #if NETINET6
3483 			freehostent(hp);
3484 			hp = NULL;
3485 #endif /* NETINET6 */
3486 		}
3487 	}
3488 
3489 	if (TimeOuts.to_ident == 0)
3490 		goto noident;
3491 
3492 	lalen = sizeof(la);
3493 	switch (RealHostAddr.sa.sa_family)
3494 	{
3495 #if NETINET
3496 	  case AF_INET:
3497 		if (getsockname(fd, &la.sa, &lalen) < 0 ||
3498 		    lalen <= 0 ||
3499 		    la.sa.sa_family != AF_INET)
3500 		{
3501 			/* no ident info */
3502 			goto noident;
3503 		}
3504 		port = RealHostAddr.sin.sin_port;
3505 
3506 		/* create ident query */
3507 		(void) sm_snprintf(ibuf, sizeof(ibuf), "%d,%d\r\n",
3508 				ntohs(RealHostAddr.sin.sin_port),
3509 				ntohs(la.sin.sin_port));
3510 
3511 		/* create local address */
3512 		la.sin.sin_port = 0;
3513 
3514 		/* create foreign address */
3515 # ifdef NO_GETSERVBYNAME
3516 		RealHostAddr.sin.sin_port = htons(113);
3517 # else /* NO_GETSERVBYNAME */
3518 
3519 		/*
3520 		**  getservbyname() consumes about 5% of the time
3521 		**  when receiving a small message (almost all of the time
3522 		**  spent in this routine).
3523 		**  Hence we store the port in a static variable
3524 		**  to save this time.
3525 		**  The portnumber shouldn't change very often...
3526 		**  This code makes the assumption that the port number
3527 		**  is not 0.
3528 		*/
3529 
3530 		if (port4 == 0)
3531 		{
3532 			sp = getservbyname("auth", "tcp");
3533 			if (sp != NULL)
3534 				port4 = sp->s_port;
3535 			else
3536 				port4 = htons(113);
3537 		}
3538 		RealHostAddr.sin.sin_port = port4;
3539 		break;
3540 # endif /* NO_GETSERVBYNAME */
3541 #endif /* NETINET */
3542 
3543 #if NETINET6
3544 	  case AF_INET6:
3545 		if (getsockname(fd, &la.sa, &lalen) < 0 ||
3546 		    lalen <= 0 ||
3547 		    la.sa.sa_family != AF_INET6)
3548 		{
3549 			/* no ident info */
3550 			goto noident;
3551 		}
3552 		port = RealHostAddr.sin6.sin6_port;
3553 
3554 		/* create ident query */
3555 		(void) sm_snprintf(ibuf, sizeof(ibuf), "%d,%d\r\n",
3556 				ntohs(RealHostAddr.sin6.sin6_port),
3557 				ntohs(la.sin6.sin6_port));
3558 
3559 		/* create local address */
3560 		la.sin6.sin6_port = 0;
3561 
3562 		/* create foreign address */
3563 # ifdef NO_GETSERVBYNAME
3564 		RealHostAddr.sin6.sin6_port = htons(113);
3565 # else /* NO_GETSERVBYNAME */
3566 		if (port6 == 0)
3567 		{
3568 			sp = getservbyname("auth", "tcp");
3569 			if (sp != NULL)
3570 				port6 = sp->s_port;
3571 			else
3572 				port6 = htons(113);
3573 		}
3574 		RealHostAddr.sin6.sin6_port = port6;
3575 		break;
3576 # endif /* NO_GETSERVBYNAME */
3577 #endif /* NETINET6 */
3578 	  default:
3579 		/* no ident info */
3580 		goto noident;
3581 	}
3582 
3583 	s = -1;
3584 	if (setjmp(CtxAuthTimeout) != 0)
3585 	{
3586 		if (s >= 0)
3587 			(void) close(s);
3588 		goto noident;
3589 	}
3590 
3591 	/* put a timeout around the whole thing */
3592 	ev = sm_setevent(TimeOuts.to_ident, authtimeout, 0);
3593 
3594 	/* connect to foreign IDENT server using same address as SMTP socket */
3595 	s = socket(la.sa.sa_family, SOCK_STREAM, 0);
3596 	if (s < 0)
3597 	{
3598 		sm_clrevent(ev);
3599 		goto noident;
3600 	}
3601 	if (bind(s, &la.sa, lalen) < 0 ||
3602 	    connect(s, &RealHostAddr.sa, lalen) < 0)
3603 		goto closeident;
3604 
3605 	if (tTd(9, 10))
3606 		sm_dprintf("getauthinfo: sent %s", ibuf);
3607 
3608 	/* send query */
3609 	if (write(s, ibuf, strlen(ibuf)) < 0)
3610 		goto closeident;
3611 
3612 	/* get result */
3613 	p = &ibuf[0];
3614 	nleft = sizeof(ibuf) - 1;
3615 	while ((i = read(s, p, nleft)) > 0)
3616 	{
3617 		char *s;
3618 
3619 		p += i;
3620 		nleft -= i;
3621 		*p = '\0';
3622 		if ((s = strchr(ibuf, '\n')) != NULL)
3623 		{
3624 			if (p > s + 1)
3625 			{
3626 				p = s + 1;
3627 				*p = '\0';
3628 			}
3629 			break;
3630 		}
3631 		if (nleft <= 0)
3632 			break;
3633 	}
3634 	(void) close(s);
3635 	sm_clrevent(ev);
3636 	if (i < 0 || p == &ibuf[0])
3637 		goto noident;
3638 
3639 	if (p >= &ibuf[2] && *--p == '\n' && *--p == '\r')
3640 		p--;
3641 	*++p = '\0';
3642 
3643 	if (tTd(9, 3))
3644 		sm_dprintf("getauthinfo:  got %s\n", ibuf);
3645 
3646 	/* parse result */
3647 	p = strchr(ibuf, ':');
3648 	if (p == NULL)
3649 	{
3650 		/* malformed response */
3651 		goto noident;
3652 	}
3653 	while (isascii(*++p) && isspace(*p))
3654 		continue;
3655 	if (sm_strncasecmp(p, "userid", 6) != 0)
3656 	{
3657 		/* presumably an error string */
3658 		goto noident;
3659 	}
3660 	p += 6;
3661 	while (isascii(*p) && isspace(*p))
3662 		p++;
3663 	if (*p++ != ':')
3664 	{
3665 		/* either useridxx or malformed response */
3666 		goto noident;
3667 	}
3668 
3669 	/* p now points to the OSTYPE field */
3670 	while (isascii(*p) && isspace(*p))
3671 		p++;
3672 	ostype = p;
3673 	p = strchr(p, ':');
3674 	if (p == NULL)
3675 	{
3676 		/* malformed response */
3677 		goto noident;
3678 	}
3679 	else
3680 	{
3681 		char *charset;
3682 
3683 		*p = '\0';
3684 		charset = strchr(ostype, ',');
3685 		if (charset != NULL)
3686 			*charset = '\0';
3687 	}
3688 
3689 	/* 1413 says don't do this -- but it's broken otherwise */
3690 	while (isascii(*++p) && isspace(*p))
3691 		continue;
3692 
3693 	/* p now points to the authenticated name -- copy carefully */
3694 	if (sm_strncasecmp(ostype, "other", 5) == 0 &&
3695 	    (ostype[5] == ' ' || ostype[5] == '\0'))
3696 	{
3697 		(void) sm_strlcpy(hbuf, "IDENT:", sizeof(hbuf));
3698 		cleanstrcpy(&hbuf[6], p, MAXAUTHINFO);
3699 	}
3700 	else
3701 		cleanstrcpy(hbuf, p, MAXAUTHINFO);
3702 	len = strlen(hbuf);
3703 	(void) sm_strlcpyn(&hbuf[len], sizeof(hbuf) - len, 2, "@",
3704 			   RealHostName == NULL ? "localhost" : RealHostName);
3705 	goto postident;
3706 
3707 closeident:
3708 	(void) close(s);
3709 	sm_clrevent(ev);
3710 
3711 noident:
3712 	/* put back the original incoming port */
3713 	switch (RealHostAddr.sa.sa_family)
3714 	{
3715 #if NETINET
3716 	  case AF_INET:
3717 		if (port > 0)
3718 			RealHostAddr.sin.sin_port = port;
3719 		break;
3720 #endif /* NETINET */
3721 
3722 #if NETINET6
3723 	  case AF_INET6:
3724 		if (port > 0)
3725 			RealHostAddr.sin6.sin6_port = port;
3726 		break;
3727 #endif /* NETINET6 */
3728 	}
3729 
3730 	if (RealHostName == NULL)
3731 	{
3732 		if (tTd(9, 1))
3733 			sm_dprintf("getauthinfo: NULL\n");
3734 		return NULL;
3735 	}
3736 	(void) sm_strlcpy(hbuf, RealHostName, sizeof(hbuf));
3737 
3738 postident:
3739 #if IP_SRCROUTE
3740 # ifndef GET_IPOPT_DST
3741 #  define GET_IPOPT_DST(dst)	(dst)
3742 # endif /* ! GET_IPOPT_DST */
3743 	/*
3744 	**  Extract IP source routing information.
3745 	**
3746 	**	Format of output for a connection from site a through b
3747 	**	through c to d:
3748 	**		loose:      @site-c@site-b:site-a
3749 	**		strict:	   !@site-c@site-b:site-a
3750 	**
3751 	**	o - pointer within ipopt_list structure.
3752 	**	q - pointer within ls/ss rr route data
3753 	**	p - pointer to hbuf
3754 	*/
3755 
3756 	if (RealHostAddr.sa.sa_family == AF_INET)
3757 	{
3758 		SOCKOPT_LEN_T ipoptlen;
3759 		int j;
3760 		unsigned char *q;
3761 		unsigned char *o;
3762 		int l;
3763 		struct IPOPTION ipopt;
3764 
3765 		ipoptlen = sizeof(ipopt);
3766 		if (getsockopt(fd, IPPROTO_IP, IP_OPTIONS,
3767 			       (char *) &ipopt, &ipoptlen) < 0)
3768 			goto noipsr;
3769 		if (ipoptlen == 0)
3770 			goto noipsr;
3771 		o = (unsigned char *) ipopt.IP_LIST;
3772 		while (o != NULL && o < (unsigned char *) &ipopt + ipoptlen)
3773 		{
3774 			switch (*o)
3775 			{
3776 			  case IPOPT_EOL:
3777 				o = NULL;
3778 				break;
3779 
3780 			  case IPOPT_NOP:
3781 				o++;
3782 				break;
3783 
3784 			  case IPOPT_SSRR:
3785 			  case IPOPT_LSRR:
3786 				/*
3787 				**  Source routing.
3788 				**	o[0] is the option type (loose/strict).
3789 				**	o[1] is the length of this option,
3790 				**		including option type and
3791 				**		length.
3792 				**	o[2] is the pointer into the route
3793 				**		data.
3794 				**	o[3] begins the route data.
3795 				*/
3796 
3797 				p = &hbuf[strlen(hbuf)];
3798 				l = sizeof(hbuf) - (hbuf - p) - 6;
3799 				(void) sm_snprintf(p, SPACELEFT(hbuf, p),
3800 					" [%s@%.*s",
3801 					*o == IPOPT_SSRR ? "!" : "",
3802 					l > 240 ? 120 : l / 2,
3803 					inet_ntoa(GET_IPOPT_DST(ipopt.IP_DST)));
3804 				i = strlen(p);
3805 				p += i;
3806 				l -= strlen(p);
3807 
3808 				j = o[1] / sizeof(struct in_addr) - 1;
3809 
3810 				/* q skips length and router pointer to data */
3811 				q = &o[3];
3812 				for ( ; j >= 0; j--)
3813 				{
3814 					struct in_addr addr;
3815 
3816 					memcpy(&addr, q, sizeof(addr));
3817 					(void) sm_snprintf(p,
3818 						SPACELEFT(hbuf, p),
3819 						"%c%.*s",
3820 						j != 0 ? '@' : ':',
3821 						l > 240 ? 120 :
3822 							j == 0 ? l : l / 2,
3823 						inet_ntoa(addr));
3824 					i = strlen(p);
3825 					p += i;
3826 					l -= i + 1;
3827 					q += sizeof(struct in_addr);
3828 				}
3829 				o += o[1];
3830 				break;
3831 
3832 			  default:
3833 				/* Skip over option */
3834 				o += o[1];
3835 				break;
3836 			}
3837 		}
3838 		(void) sm_snprintf(p, SPACELEFT(hbuf, p), "]");
3839 		goto postipsr;
3840 	}
3841 
3842 noipsr:
3843 #endif /* IP_SRCROUTE */
3844 	if (RealHostName != NULL && RealHostName[0] != '[')
3845 	{
3846 		p = &hbuf[strlen(hbuf)];
3847 		(void) sm_snprintf(p, SPACELEFT(hbuf, p), " [%.100s]",
3848 				   anynet_ntoa(&RealHostAddr));
3849 	}
3850 	if (*may_be_forged)
3851 	{
3852 		p = &hbuf[strlen(hbuf)];
3853 		(void) sm_strlcpy(p, " (may be forged)", SPACELEFT(hbuf, p));
3854 		macdefine(&BlankEnvelope.e_macro, A_PERM,
3855 			  macid("{client_resolve}"), "FORGED");
3856 	}
3857 
3858 #if IP_SRCROUTE
3859 postipsr:
3860 #endif /* IP_SRCROUTE */
3861 
3862 	/* put back the original incoming port */
3863 	switch (RealHostAddr.sa.sa_family)
3864 	{
3865 #if NETINET
3866 	  case AF_INET:
3867 		if (port > 0)
3868 			RealHostAddr.sin.sin_port = port;
3869 		break;
3870 #endif /* NETINET */
3871 
3872 #if NETINET6
3873 	  case AF_INET6:
3874 		if (port > 0)
3875 			RealHostAddr.sin6.sin6_port = port;
3876 		break;
3877 #endif /* NETINET6 */
3878 	}
3879 
3880 	if (tTd(9, 1))
3881 		sm_dprintf("getauthinfo: %s\n", hbuf);
3882 	return hbuf;
3883 }
3884 /*
3885 **  HOST_MAP_LOOKUP -- turn a hostname into canonical form
3886 **
3887 **	Parameters:
3888 **		map -- a pointer to this map.
3889 **		name -- the (presumably unqualified) hostname.
3890 **		av -- unused -- for compatibility with other mapping
3891 **			functions.
3892 **		statp -- an exit status (out parameter) -- set to
3893 **			EX_TEMPFAIL if the name server is unavailable.
3894 **
3895 **	Returns:
3896 **		The mapping, if found.
3897 **		NULL if no mapping found.
3898 **
3899 **	Side Effects:
3900 **		Looks up the host specified in hbuf.  If it is not
3901 **		the canonical name for that host, return the canonical
3902 **		name (unless MF_MATCHONLY is set, which will cause the
3903 **		status only to be returned).
3904 */
3905 
3906 char *
host_map_lookup(map,name,av,statp)3907 host_map_lookup(map, name, av, statp)
3908 	MAP *map;
3909 	char *name;
3910 	char **av;
3911 	int *statp;
3912 {
3913 	register struct hostent *hp;
3914 #if NETINET
3915 	struct in_addr in_addr;
3916 #endif /* NETINET */
3917 #if NETINET6
3918 	struct in6_addr in6_addr;
3919 #endif /* NETINET6 */
3920 	char *cp, *ans = NULL;
3921 	register STAB *s;
3922 	time_t now;
3923 #if NAMED_BIND
3924 	time_t SM_NONVOLATILE retrans = 0;
3925 	int SM_NONVOLATILE retry = 0;
3926 #endif /* NAMED_BIND */
3927 	char hbuf[MAXNAME + 1];
3928 
3929 	/*
3930 	**  See if we have already looked up this name.  If so, just
3931 	**  return it (unless expired).
3932 	*/
3933 
3934 	now = curtime();
3935 	s = stab(name, ST_NAMECANON, ST_ENTER);
3936 	if (bitset(NCF_VALID, s->s_namecanon.nc_flags) &&
3937 	    s->s_namecanon.nc_exp >= now)
3938 	{
3939 		if (tTd(9, 1))
3940 			sm_dprintf("host_map_lookup(%s) => CACHE %s\n",
3941 				    name,
3942 				    s->s_namecanon.nc_cname == NULL
3943 					? "NULL"
3944 					: s->s_namecanon.nc_cname);
3945 		errno = s->s_namecanon.nc_errno;
3946 		SM_SET_H_ERRNO(s->s_namecanon.nc_herrno);
3947 		*statp = s->s_namecanon.nc_stat;
3948 		if (*statp == EX_TEMPFAIL)
3949 		{
3950 			CurEnv->e_status = "4.4.3";
3951 			message("851 %s: Name server timeout",
3952 				shortenstring(name, 33));
3953 		}
3954 		if (*statp != EX_OK)
3955 			return NULL;
3956 		if (s->s_namecanon.nc_cname == NULL)
3957 		{
3958 			syserr("host_map_lookup(%s): bogus NULL cache entry, errno=%d, h_errno=%d",
3959 			       name,
3960 			       s->s_namecanon.nc_errno,
3961 			       s->s_namecanon.nc_herrno);
3962 			return NULL;
3963 		}
3964 		if (bitset(MF_MATCHONLY, map->map_mflags))
3965 			cp = map_rewrite(map, name, strlen(name),