1 # include <signal.h>
2 # include <errno.h>
3 # include "sendmail.h"
4 # ifdef LOG
5 # include <syslog.h>
6 # endif LOG
7 
8 static char SccsId[] = "@(#)deliver.c	3.25	08/20/81";
9 
10 /*
11 **  DELIVER -- Deliver a message to a particular address.
12 **
13 **	Parameters:
14 **		to -- the address to deliver the message to.
15 **		editfcn -- if non-NULL, we want to call this function
16 **			to output the letter (instead of just out-
17 **			putting it raw).
18 **
19 **	Returns:
20 **		zero -- successfully delivered.
21 **		else -- some failure, see ExitStat for more info.
22 **
23 **	Side Effects:
24 **		The standard input is passed off to someone.
25 */
26 
27 deliver(to, editfcn)
28 	ADDRESS *to;
29 	int (*editfcn)();
30 {
31 	char *host;
32 	char *user;
33 	char **pvp;
34 	register char **mvp;
35 	register char *p;
36 	register struct mailer *m;
37 	register int i;
38 	extern putmessage();
39 	extern bool checkcompat();
40 	char *pv[MAXPV+1];
41 	char tobuf[MAXLINE];
42 	char buf[MAXNAME];
43 	bool firstone;
44 
45 	if (bitset(QDONTSEND, to->q_flags))
46 		return (0);
47 
48 # ifdef DEBUG
49 	if (Debug)
50 		printf("\n--deliver, mailer=%d, host=`%s', first user=`%s'\n",
51 			to->q_mailer, to->q_host, to->q_user);
52 # endif DEBUG
53 
54 	/*
55 	**  Do initial argv setup.
56 	**	Insert the mailer name.  Notice that $x expansion is
57 	**	NOT done on the mailer name.  Then, if the mailer has
58 	**	a picky -f flag, we insert it as appropriate.  This
59 	**	code does not check for 'pv' overflow; this places a
60 	**	manifest lower limit of 4 for MAXPV.
61 	*/
62 
63 	m = Mailer[to->q_mailer];
64 	host = to->q_host;
65 	define('g', m->m_from);		/* translated from address */
66 	define('h', host);		/* to host */
67 	Errors = 0;
68 	errno = 0;
69 	pvp = pv;
70 	*pvp++ = m->m_argv[0];
71 
72 	/* insert -f or -r flag as appropriate */
73 	if (bitset(M_FOPT|M_ROPT, m->m_flags) && FromFlag)
74 	{
75 		if (bitset(M_FOPT, m->m_flags))
76 			*pvp++ = "-f";
77 		else
78 			*pvp++ = "-r";
79 		(void) expand("$g", buf, &buf[sizeof buf - 1]);
80 		*pvp++ = newstr(buf);
81 	}
82 
83 	/*
84 	**  Append the other fixed parts of the argv.  These run
85 	**  up to the first entry containing "$u".  There can only
86 	**  be one of these, and there are only a few more slots
87 	**  in the pv after it.
88 	*/
89 
90 	for (mvp = m->m_argv; (p = *++mvp) != NULL; )
91 	{
92 		while ((p = index(p, '$')) != NULL)
93 			if (*++p == 'u')
94 				break;
95 		if (p != NULL)
96 			break;
97 
98 		/* this entry is safe -- go ahead and process it */
99 		(void) expand(*mvp, buf, &buf[sizeof buf - 1]);
100 		*pvp++ = newstr(buf);
101 		if (pvp >= &pv[MAXPV - 3])
102 		{
103 			syserr("Too many parameters to %s before $u", pv[0]);
104 			return (-1);
105 		}
106 	}
107 	if (*mvp == NULL)
108 		syserr("No $u in mailer argv for %s", pv[0]);
109 
110 	/*
111 	**  At this point *mvp points to the argument with $u.  We
112 	**  run through our address list and append all the addresses
113 	**  we can.  If we run out of space, do not fret!  We can
114 	**  always send another copy later.
115 	*/
116 
117 	tobuf[0] = '\0';
118 	firstone = TRUE;
119 	To = tobuf;
120 	for (; to != NULL; to = to->q_next)
121 	{
122 		/* avoid sending multiple recipients to dumb mailers */
123 		if (!firstone && !bitset(M_MUSER, m->m_flags))
124 			break;
125 
126 		/* if already sent or not for this host, don't send */
127 		if (bitset(QDONTSEND, to->q_flags) || strcmp(to->q_host, host) != 0)
128 			continue;
129 		user = to->q_user;
130 		To = to->q_paddr;
131 		to->q_flags |= QDONTSEND;
132 		firstone = FALSE;
133 
134 # ifdef DEBUG
135 		if (Debug)
136 			printf("   send to `%s'\n", user);
137 # endif DEBUG
138 
139 		/*
140 		**  Check to see that these people are allowed to
141 		**  talk to each other.
142 		*/
143 
144 		if (!checkcompat(to))
145 		{
146 			giveresponse(EX_UNAVAILABLE, TRUE, m);
147 			continue;
148 		}
149 
150 		/*
151 		**  Strip quote bits from names if the mailer is dumb
152 		**	about them.
153 		*/
154 
155 		if (bitset(M_STRIPQ, m->m_flags))
156 		{
157 			stripquotes(user, TRUE);
158 			stripquotes(host, TRUE);
159 		}
160 		else
161 		{
162 			stripquotes(user, FALSE);
163 			stripquotes(host, FALSE);
164 		}
165 
166 		/*
167 		**  If an error message has already been given, don't
168 		**	bother to send to this address.
169 		**
170 		**	>>>>>>>>>> This clause assumes that the local mailer
171 		**	>> NOTE >> cannot do any further aliasing; that
172 		**	>>>>>>>>>> function is subsumed by sendmail.
173 		*/
174 
175 		if (bitset(QBADADDR, to->q_flags))
176 			continue;
177 
178 		/*
179 		**  See if this user name is "special".
180 		**	If the user name has a slash in it, assume that this
181 		**	is a file -- send it off without further ado.
182 		**	Note that this means that editfcn's will not
183 		**	be applied to the message.  Also note that
184 		**	this type of addresses is not processed along
185 		**	with the others, so we fudge on the To person.
186 		*/
187 
188 		if (m == Mailer[M_LOCAL])
189 		{
190 			if (index(user, '/') != NULL)
191 			{
192 				i = mailfile(user);
193 				giveresponse(i, TRUE, m);
194 				continue;
195 			}
196 		}
197 
198 		/* create list of users for error messages */
199 		if (tobuf[0] != '\0')
200 			(void) strcat(tobuf, ",");
201 		(void) strcat(tobuf, to->q_paddr);
202 		define('u', user);		/* to user */
203 		define('z', to->q_home);	/* user's home */
204 
205 		/* expand out this user */
206 		(void) expand(user, buf, &buf[sizeof buf - 1]);
207 		*pvp++ = newstr(buf);
208 		if (pvp >= &pv[MAXPV - 2])
209 		{
210 			/* allow some space for trailing parms */
211 			break;
212 		}
213 	}
214 
215 	/* see if any addresses still exist */
216 	if (tobuf[0] == '\0')
217 		return (0);
218 
219 	/* print out messages as full list */
220 	To = tobuf;
221 
222 	/*
223 	**  Fill out any parameters after the $u parameter.
224 	*/
225 
226 	while (*++mvp != NULL)
227 	{
228 		(void) expand(*mvp, buf, &buf[sizeof buf - 1]);
229 		*pvp++ = newstr(buf);
230 		if (pvp >= &pv[MAXPV])
231 			syserr("deliver: pv overflow after $u for %s", pv[0]);
232 	}
233 	*pvp++ = NULL;
234 
235 	/*
236 	**  Call the mailer.
237 	**	The argument vector gets built, pipes
238 	**	are created as necessary, and we fork & exec as
239 	**	appropriate.
240 	**
241 	**	Notice the tacky hack to handle private mailers.
242 	*/
243 
244 	if (editfcn == NULL)
245 		editfcn = putmessage;
246 	i = sendoff(m, pv, editfcn);
247 
248 	return (i);
249 }
250 /*
251 **  SENDOFF -- send off call to mailer & collect response.
252 **
253 **	Parameters:
254 **		m -- mailer descriptor.
255 **		pvp -- parameter vector to send to it.
256 **		editfcn -- function to pipe it through.
257 **
258 **	Returns:
259 **		exit status of mailer.
260 **
261 **	Side Effects:
262 **		none.
263 */
264 
265 #define NFORKTRIES	5
266 
267 sendoff(m, pvp, editfcn)
268 	struct mailer *m;
269 	char **pvp;
270 	int (*editfcn)();
271 {
272 	auto int st;
273 	register int i;
274 	int pid;
275 	int pvect[2];
276 	FILE *mfile;
277 	extern putmessage();
278 	extern FILE *fdopen();
279 
280 # ifdef DEBUG
281 	if (Debug)
282 	{
283 		printf("Sendoff:\n");
284 		printav(pvp);
285 	}
286 # endif DEBUG
287 
288 	/* create a pipe to shove the mail through */
289 	if (pipe(pvect) < 0)
290 	{
291 		syserr("pipe");
292 		return (-1);
293 	}
294 	for (i = NFORKTRIES; i-- > 0; )
295 	{
296 # ifdef VFORK
297 		pid = vfork();
298 # else
299 		pid = fork();
300 # endif
301 		if (pid >= 0)
302 			break;
303 		sleep((unsigned) NFORKTRIES - i);
304 	}
305 	if (pid < 0)
306 	{
307 		syserr("Cannot fork");
308 		(void) close(pvect[0]);
309 		(void) close(pvect[1]);
310 		return (-1);
311 	}
312 	else if (pid == 0)
313 	{
314 		/* child -- set up input & exec mailer */
315 		/* make diagnostic output be standard output */
316 		(void) close(2);
317 		(void) dup(1);
318 		(void) signal(SIGINT, SIG_IGN);
319 		(void) close(0);
320 		if (dup(pvect[0]) < 0)
321 		{
322 			syserr("Cannot dup to zero!");
323 			_exit(EX_OSERR);
324 		}
325 		(void) close(pvect[0]);
326 		(void) close(pvect[1]);
327 		if (!bitset(M_RESTR, m->m_flags))
328 			(void) setuid(getuid());
329 # ifndef VFORK
330 		/*
331 		**  We have to be careful with vfork - we can't mung up the
332 		**  memory but we don't want the mailer to inherit any extra
333 		**  open files.  Chances are the mailer won't
334 		**  care about an extra file, but then again you never know.
335 		**  Actually, we would like to close(fileno(pwf)), but it's
336 		**  declared static so we can't.  But if we fclose(pwf), which
337 		**  is what endpwent does, it closes it in the parent too and
338 		**  the next getpwnam will be slower.  If you have a weird
339 		**  mailer that chokes on the extra file you should do the
340 		**  endpwent().
341 		**
342 		**  Similar comments apply to log.  However, openlog is
343 		**  clever enough to set the FIOCLEX mode on the file,
344 		**  so it will be closed automatically on the exec.
345 		*/
346 
347 		endpwent();
348 # ifdef LOG
349 		closelog();
350 # endif LOG
351 # endif VFORK
352 		execv(m->m_mailer, pvp);
353 		/* syserr fails because log is closed */
354 		/* syserr("Cannot exec %s", m->m_mailer); */
355 		printf("Cannot exec %s\n", m->m_mailer);
356 		(void) fflush(stdout);
357 		_exit(EX_UNAVAILABLE);
358 	}
359 
360 	/* write out message to mailer */
361 	(void) close(pvect[0]);
362 	(void) signal(SIGPIPE, SIG_IGN);
363 	mfile = fdopen(pvect[1], "w");
364 	if (editfcn == NULL)
365 		editfcn = putmessage;
366 	(*editfcn)(mfile, m);
367 	(void) fclose(mfile);
368 
369 	/*
370 	**  Wait for child to die and report status.
371 	**	We should never get fatal errors (e.g., segmentation
372 	**	violation), so we report those specially.  For other
373 	**	errors, we choose a status message (into statmsg),
374 	**	and if it represents an error, we print it.
375 	*/
376 
377 	while ((i = wait(&st)) > 0 && i != pid)
378 		continue;
379 	if (i < 0)
380 	{
381 		syserr("wait");
382 		return (-1);
383 	}
384 	if ((st & 0377) != 0)
385 	{
386 		syserr("%s: stat %o", pvp[0], st);
387 		ExitStat = EX_UNAVAILABLE;
388 		return (-1);
389 	}
390 	i = (st >> 8) & 0377;
391 	giveresponse(i, TRUE, m);
392 	return (i);
393 }
394 /*
395 **  GIVERESPONSE -- Interpret an error response from a mailer
396 **
397 **	Parameters:
398 **		stat -- the status code from the mailer (high byte
399 **			only; core dumps must have been taken care of
400 **			already).
401 **		force -- if set, force an error message output, even
402 **			if the mailer seems to like to print its own
403 **			messages.
404 **		m -- the mailer descriptor for this mailer.
405 **
406 **	Returns:
407 **		none.
408 **
409 **	Side Effects:
410 **		Errors may be incremented.
411 **		ExitStat may be set.
412 **
413 **	Called By:
414 **		deliver
415 */
416 
417 giveresponse(stat, force, m)
418 	int stat;
419 	int force;
420 	register struct mailer *m;
421 {
422 	register char *statmsg;
423 	extern char *SysExMsg[];
424 	register int i;
425 	extern int N_SysEx;
426 	extern long MsgSize;
427 	char buf[30];
428 
429 	i = stat - EX__BASE;
430 	if (i < 0 || i > N_SysEx)
431 		statmsg = NULL;
432 	else
433 		statmsg = SysExMsg[i];
434 	if (stat == 0)
435 	{
436 		if (bitset(M_FINAL, m->m_flags))
437 			statmsg = "delivered";
438 		else
439 			statmsg = "queued";
440 		if (Verbose)
441 			message(Arpa_Info, statmsg);
442 	}
443 	else
444 	{
445 		Errors++;
446 		if (statmsg == NULL && m->m_badstat != 0)
447 		{
448 			stat = m->m_badstat;
449 			i = stat - EX__BASE;
450 # ifdef DEBUG
451 			if (i < 0 || i >= N_SysEx)
452 				syserr("Bad m_badstat %d", stat);
453 			else
454 # endif DEBUG
455 			statmsg = SysExMsg[i];
456 		}
457 		if (statmsg == NULL)
458 			usrerr("unknown mailer response %d", stat);
459 		else if (force || !bitset(M_QUIET, m->m_flags) || Verbose)
460 			usrerr("%s", statmsg);
461 	}
462 
463 	/*
464 	**  Final cleanup.
465 	**	Log a record of the transaction.  Compute the new
466 	**	ExitStat -- if we already had an error, stick with
467 	**	that.
468 	*/
469 
470 	if (statmsg == NULL)
471 	{
472 		(void) sprintf(buf, "error %d", stat);
473 		statmsg = buf;
474 	}
475 
476 # ifdef LOG
477 	syslog(LOG_INFO, "%s->%s: %ld: %s", From.q_paddr, To, MsgSize, statmsg);
478 # endif LOG
479 	setstat(stat);
480 }
481 /*
482 **  PUTMESSAGE -- output a message to the final mailer.
483 **
484 **	This routine takes care of recreating the header from the
485 **	in-core copy, etc.
486 **
487 **	Parameters:
488 **		fp -- file to output onto.
489 **		m -- a mailer descriptor.
490 **
491 **	Returns:
492 **		none.
493 **
494 **	Side Effects:
495 **		The message is written onto fp.
496 */
497 
498 putmessage(fp, m)
499 	FILE *fp;
500 	struct mailer *m;
501 {
502 	char buf[BUFSIZ];
503 	register int i;
504 	HDR *h;
505 	register char *p;
506 	extern char *arpadate();
507 	bool anyheader = FALSE;
508 	extern char *capitalize();
509 
510 	/* output "From" line unless supressed */
511 	if (!bitset(M_NHDR, m->m_flags))
512 		fprintf(fp, "%s\n", FromLine);
513 
514 	/* output all header lines */
515 	for (h = Header; h != NULL; h = h->h_link)
516 	{
517 		if (bitset(H_DELETE, h->h_flags))
518 			continue;
519 		if (bitset(H_CHECK|H_ACHECK, h->h_flags) && !bitset(h->h_mflags, m->m_flags))
520 			continue;
521 		if (bitset(H_DEFAULT, h->h_flags))
522 		{
523 			(void) expand(h->h_value, buf, &buf[sizeof buf]);
524 			p = buf;
525 		}
526 		else
527 			p = h->h_value;
528 		if (*p == '\0')
529 			continue;
530 		fprintf(fp, "%s: %s\n", capitalize(h->h_field), p);
531 		h->h_flags |= H_USED;
532 		anyheader = TRUE;
533 	}
534 
535 	if (anyheader)
536 		fprintf(fp, "\n");
537 
538 	/* output the body of the message */
539 	rewind(TempFile);
540 	while (!ferror(fp) && (i = fread(buf, 1, BUFSIZ, TempFile)) > 0)
541 		(void) fwrite(buf, 1, i, fp);
542 
543 	if (ferror(fp) && errno != EPIPE)
544 	{
545 		syserr("putmessage: write error");
546 		setstat(EX_IOERR);
547 	}
548 	errno = 0;
549 }
550 /*
551 **  MAILFILE -- Send a message to a file.
552 **
553 **	Parameters:
554 **		filename -- the name of the file to send to.
555 **
556 **	Returns:
557 **		The exit code associated with the operation.
558 **
559 **	Side Effects:
560 **		none.
561 **
562 **	Called By:
563 **		deliver
564 */
565 
566 mailfile(filename)
567 	char *filename;
568 {
569 	register FILE *f;
570 
571 	f = fopen(filename, "a");
572 	if (f == NULL)
573 		return (EX_CANTCREAT);
574 
575 	putmessage(f, Mailer[1]);
576 	fputs("\n", f);
577 	(void) fclose(f);
578 	return (EX_OK);
579 }
580