1 /*
2  * Copyright (c) 1983 Eric P. Allman
3  * Copyright (c) 1988, 1993
4  *	The Regents of the University of California.  All rights reserved.
5  *
6  * %sccs.include.redist.c%
7  */
8 
9 #ifndef lint
10 static char sccsid[] = "@(#)collect.c	8.3 (Berkeley) 07/29/93";
11 #endif /* not lint */
12 
13 # include <errno.h>
14 # include "sendmail.h"
15 
16 /*
17 **  COLLECT -- read & parse message header & make temp file.
18 **
19 **	Creates a temporary file name and copies the standard
20 **	input to that file.  Leading UNIX-style "From" lines are
21 **	stripped off (after important information is extracted).
22 **
23 **	Parameters:
24 **		smtpmode -- if set, we are running SMTP: give an RFC821
25 **			style message to say we are ready to collect
26 **			input, and never ignore a single dot to mean
27 **			end of message.
28 **		requeueflag -- this message will be requeued later, so
29 **			don't do final processing on it.
30 **		e -- the current envelope.
31 **
32 **	Returns:
33 **		none.
34 **
35 **	Side Effects:
36 **		Temp file is created and filled.
37 **		The from person may be set.
38 */
39 
40 collect(smtpmode, requeueflag, e)
41 	bool smtpmode;
42 	bool requeueflag;
43 	register ENVELOPE *e;
44 {
45 	register FILE *tf;
46 	bool ignrdot = smtpmode ? FALSE : IgnrDot;
47 	char buf[MAXLINE], buf2[MAXLINE];
48 	register char *workbuf, *freebuf;
49 	extern char *hvalue();
50 	extern bool isheader(), flusheol();
51 
52 	/*
53 	**  Create the temp file name and create the file.
54 	*/
55 
56 	e->e_df = queuename(e, 'd');
57 	e->e_df = newstr(e->e_df);
58 	if ((tf = dfopen(e->e_df, O_WRONLY|O_CREAT, FileMode)) == NULL)
59 	{
60 		syserr("Cannot create %s", e->e_df);
61 		NoReturn = TRUE;
62 		finis();
63 	}
64 
65 	/*
66 	**  Tell ARPANET to go ahead.
67 	*/
68 
69 	if (smtpmode)
70 		message("354 Enter mail, end with \".\" on a line by itself");
71 
72 	/*
73 	**  Try to read a UNIX-style From line
74 	*/
75 
76 	if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock,
77 			"initial message read") == NULL)
78 		goto readerr;
79 	fixcrlf(buf, FALSE);
80 # ifndef NOTUNIX
81 	if (!SaveFrom && strncmp(buf, "From ", 5) == 0)
82 	{
83 		if (!flusheol(buf, InChannel))
84 			goto readerr;
85 		eatfrom(buf, e);
86 		if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock,
87 				"message header read") == NULL)
88 			goto readerr;
89 		fixcrlf(buf, FALSE);
90 	}
91 # endif /* NOTUNIX */
92 
93 	/*
94 	**  Copy InChannel to temp file & do message editing.
95 	**	To keep certain mailers from getting confused,
96 	**	and to keep the output clean, lines that look
97 	**	like UNIX "From" lines are deleted in the header.
98 	*/
99 
100 	workbuf = buf;		/* `workbuf' contains a header field */
101 	freebuf = buf2;		/* `freebuf' can be used for read-ahead */
102 	for (;;)
103 	{
104 		char *curbuf;
105 		int curbuffree;
106 		register int curbuflen;
107 		char *p;
108 
109 		/* first, see if the header is over */
110 		if (!isheader(workbuf))
111 		{
112 			fixcrlf(workbuf, TRUE);
113 			break;
114 		}
115 
116 		/* if the line is too long, throw the rest away */
117 		if (!flusheol(workbuf, InChannel))
118 			goto readerr;
119 
120 		/* it's okay to toss '\n' now (flusheol() needed it) */
121 		fixcrlf(workbuf, TRUE);
122 
123 		curbuf = workbuf;
124 		curbuflen = strlen(curbuf);
125 		curbuffree = MAXLINE - curbuflen;
126 		p = curbuf + curbuflen;
127 
128 		/* get the rest of this field */
129 		for (;;)
130 		{
131 			int clen;
132 
133 			if (sfgets(freebuf, MAXLINE, InChannel,
134 					TimeOuts.to_datablock,
135 					"message header read") == NULL)
136 				goto readerr;
137 
138 			/* is this a continuation line? */
139 			if (*freebuf != ' ' && *freebuf != '\t')
140 				break;
141 
142 			if (!flusheol(freebuf, InChannel))
143 				goto readerr;
144 
145 			fixcrlf(freebuf, TRUE);
146 			clen = strlen(freebuf) + 1;
147 
148 			/* if insufficient room, dynamically allocate buffer */
149 			if (clen >= curbuffree)
150 			{
151 				/* reallocate buffer */
152 				int nbuflen = ((p - curbuf) + clen) * 2;
153 				char *nbuf = xalloc(nbuflen);
154 
155 				p = nbuf + curbuflen;
156 				curbuffree = nbuflen - curbuflen;
157 				bcopy(curbuf, nbuf, curbuflen);
158 				if (curbuf != buf && curbuf != buf2)
159 					free(curbuf);
160 				curbuf = nbuf;
161 			}
162 			*p++ = '\n';
163 			bcopy(freebuf, p, clen - 1);
164 			p += clen - 1;
165 			curbuffree -= clen;
166 			curbuflen += clen;
167 		}
168 		*p++ = '\0';
169 
170 		e->e_msgsize += curbuflen;
171 
172 		/*
173 		**  The working buffer now becomes the free buffer, since
174 		**  the free buffer contains a new header field.
175 		**
176 		**  This is premature, since we still havent called
177 		**  chompheader() to process the field we just created
178 		**  (so the call to chompheader() will use `freebuf').
179 		**  This convolution is necessary so that if we break out
180 		**  of the loop due to H_EOH, `workbuf' will always be
181 		**  the next unprocessed buffer.
182 		*/
183 
184 		{
185 			register char *tmp = workbuf;
186 			workbuf = freebuf;
187 			freebuf = tmp;
188 		}
189 
190 		/*
191 		**  Snarf header away.
192 		*/
193 
194 		if (bitset(H_EOH, chompheader(curbuf, FALSE, e)))
195 			break;
196 
197 		/*
198 		**  If the buffer was dynamically allocated, free it.
199 		*/
200 
201 		if (curbuf != buf && curbuf != buf2)
202 			free(curbuf);
203 	}
204 
205 	if (tTd(30, 1))
206 		printf("EOH\n");
207 
208 	if (*workbuf == '\0')
209 	{
210 		/* throw away a blank line */
211 		if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock,
212 				"message separator read") == NULL)
213 			goto readerr;
214 	}
215 	else if (workbuf == buf2)	/* guarantee `buf' contains data */
216 		(void) strcpy(buf, buf2);
217 
218 	/*
219 	**  Collect the body of the message.
220 	*/
221 
222 	do
223 	{
224 		register char *bp = buf;
225 
226 		fixcrlf(buf, TRUE);
227 
228 		/* check for end-of-message */
229 		if (!ignrdot && buf[0] == '.' && (buf[1] == '\n' || buf[1] == '\0'))
230 			break;
231 
232 		/* check for transparent dot */
233 		if (OpMode == MD_SMTP && bp[0] == '.' && bp[1] == '.')
234 			bp++;
235 
236 		/*
237 		**  Figure message length, output the line to the temp
238 		**  file, and insert a newline if missing.
239 		*/
240 
241 		e->e_msgsize += strlen(bp) + 1;
242 		fputs(bp, tf);
243 		fputs("\n", tf);
244 		if (ferror(tf))
245 			tferror(tf, e);
246 	} while (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock,
247 			"message body read") != NULL);
248 
249 readerr:
250 	if (fflush(tf) != 0)
251 		tferror(tf, e);
252 	(void) fsync(fileno(tf));
253 	(void) fclose(tf);
254 
255 	/* An EOF when running SMTP is an error */
256 	if ((feof(InChannel) || ferror(InChannel)) && OpMode == MD_SMTP)
257 	{
258 		char *host;
259 
260 		host = RealHostName;
261 		if (host == NULL)
262 			host = "localhost";
263 
264 # ifdef LOG
265 		if (LogLevel > 0 && feof(InChannel))
266 			syslog(LOG_NOTICE,
267 			    "collect: unexpected close on connection from %s, sender=%s: %m\n",
268 			    host, e->e_from.q_paddr);
269 # endif
270 		(feof(InChannel) ? usrerr : syserr)
271 			("451 collect: unexpected close on connection from %s, from=%s",
272 				host, e->e_from.q_paddr);
273 
274 		/* don't return an error indication */
275 		e->e_to = NULL;
276 		e->e_flags &= ~EF_FATALERRS;
277 
278 		/* and don't try to deliver the partial message either */
279 		finis();
280 	}
281 
282 	/*
283 	**  Find out some information from the headers.
284 	**	Examples are who is the from person & the date.
285 	*/
286 
287 	eatheader(e, !requeueflag);
288 
289 	/* collect statistics */
290 	if (OpMode != MD_VERIFY)
291 		markstats(e, (ADDRESS *) NULL);
292 
293 	/*
294 	**  Add an Apparently-To: line if we have no recipient lines.
295 	*/
296 
297 	if (hvalue("to", e) == NULL && hvalue("cc", e) == NULL &&
298 	    hvalue("bcc", e) == NULL && hvalue("apparently-to", e) == NULL)
299 	{
300 		register ADDRESS *q;
301 
302 		/* create an Apparently-To: field */
303 		/*    that or reject the message.... */
304 		for (q = e->e_sendqueue; q != NULL; q = q->q_next)
305 		{
306 			if (q->q_alias != NULL)
307 				continue;
308 			if (tTd(30, 3))
309 				printf("Adding Apparently-To: %s\n", q->q_paddr);
310 			addheader("Apparently-To", q->q_paddr, e);
311 		}
312 	}
313 
314 	/* check for message too large */
315 	if (MaxMessageSize > 0 && e->e_msgsize > MaxMessageSize)
316 	{
317 		usrerr("552 Message exceeds maximum fixed size (%ld)",
318 			MaxMessageSize);
319 	}
320 
321 	if ((e->e_dfp = fopen(e->e_df, "r")) == NULL)
322 	{
323 		/* we haven't acked receipt yet, so just chuck this */
324 		syserr("Cannot reopen %s", e->e_df);
325 		finis();
326 	}
327 }
328 /*
329 **  FLUSHEOL -- if not at EOL, throw away rest of input line.
330 **
331 **	Parameters:
332 **		buf -- last line read in (checked for '\n'),
333 **		fp -- file to be read from.
334 **
335 **	Returns:
336 **		FALSE on error from sfgets(), TRUE otherwise.
337 **
338 **	Side Effects:
339 **		none.
340 */
341 
342 bool
343 flusheol(buf, fp)
344 	char *buf;
345 	FILE *fp;
346 {
347 	register char *p = buf;
348 	bool printmsg = TRUE;
349 	char junkbuf[MAXLINE];
350 
351 	while (strchr(p, '\n') == NULL)
352 	{
353 		if (printmsg)
354 			usrerr("553 header line too long");
355 		printmsg = FALSE;
356 		if (sfgets(junkbuf, MAXLINE, fp, TimeOuts.to_datablock,
357 				"long line flush") == NULL)
358 			return (FALSE);
359 		p = junkbuf;
360 	}
361 
362 	return (TRUE);
363 }
364 /*
365 **  TFERROR -- signal error on writing the temporary file.
366 **
367 **	Parameters:
368 **		tf -- the file pointer for the temporary file.
369 **
370 **	Returns:
371 **		none.
372 **
373 **	Side Effects:
374 **		Gives an error message.
375 **		Arranges for following output to go elsewhere.
376 */
377 
378 tferror(tf, e)
379 	FILE *tf;
380 	register ENVELOPE *e;
381 {
382 	if (errno == ENOSPC)
383 	{
384 		(void) freopen(e->e_df, "w", tf);
385 		fputs("\nMAIL DELETED BECAUSE OF LACK OF DISK SPACE\n\n", tf);
386 		usrerr("452 Out of disk space for temp file");
387 	}
388 	else
389 		syserr("collect: Cannot write %s", e->e_df);
390 	(void) freopen("/dev/null", "w", tf);
391 }
392 /*
393 **  EATFROM -- chew up a UNIX style from line and process
394 **
395 **	This does indeed make some assumptions about the format
396 **	of UNIX messages.
397 **
398 **	Parameters:
399 **		fm -- the from line.
400 **
401 **	Returns:
402 **		none.
403 **
404 **	Side Effects:
405 **		extracts what information it can from the header,
406 **		such as the date.
407 */
408 
409 # ifndef NOTUNIX
410 
411 char	*DowList[] =
412 {
413 	"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", NULL
414 };
415 
416 char	*MonthList[] =
417 {
418 	"Jan", "Feb", "Mar", "Apr", "May", "Jun",
419 	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
420 	NULL
421 };
422 
423 eatfrom(fm, e)
424 	char *fm;
425 	register ENVELOPE *e;
426 {
427 	register char *p;
428 	register char **dt;
429 
430 	if (tTd(30, 2))
431 		printf("eatfrom(%s)\n", fm);
432 
433 	/* find the date part */
434 	p = fm;
435 	while (*p != '\0')
436 	{
437 		/* skip a word */
438 		while (*p != '\0' && *p != ' ')
439 			p++;
440 		while (*p == ' ')
441 			p++;
442 		if (!(isascii(*p) && isupper(*p)) ||
443 		    p[3] != ' ' || p[13] != ':' || p[16] != ':')
444 			continue;
445 
446 		/* we have a possible date */
447 		for (dt = DowList; *dt != NULL; dt++)
448 			if (strncmp(*dt, p, 3) == 0)
449 				break;
450 		if (*dt == NULL)
451 			continue;
452 
453 		for (dt = MonthList; *dt != NULL; dt++)
454 			if (strncmp(*dt, &p[4], 3) == 0)
455 				break;
456 		if (*dt != NULL)
457 			break;
458 	}
459 
460 	if (*p != '\0')
461 	{
462 		char *q;
463 		extern char *arpadate();
464 
465 		/* we have found a date */
466 		q = xalloc(25);
467 		(void) strncpy(q, p, 25);
468 		q[24] = '\0';
469 		q = arpadate(q);
470 		define('a', newstr(q), e);
471 	}
472 }
473 
474 # endif /* NOTUNIX */
475