1 /*
2  * Copyright (c) 1983 Eric P. Allman
3  * Copyright (c) 1988 Regents of the University of California.
4  * All rights reserved.
5  *
6  * %sccs.include.redist.c%
7  */
8 
9 #ifndef lint
10 static char sccsid[] = "@(#)collect.c	6.19 (Berkeley) 05/30/93";
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 = newstr(queuename(e, 'd'));
57 	if ((tf = dfopen(e->e_df, O_WRONLY|O_CREAT, FileMode)) == NULL)
58 	{
59 		syserr("Cannot create %s", e->e_df);
60 		NoReturn = TRUE;
61 		finis();
62 	}
63 
64 	/*
65 	**  Tell ARPANET to go ahead.
66 	*/
67 
68 	if (smtpmode)
69 		message("354 Enter mail, end with \".\" on a line by itself");
70 
71 	/*
72 	**  Try to read a UNIX-style From line
73 	*/
74 
75 	if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock) == NULL)
76 		goto readerr;
77 	fixcrlf(buf, FALSE);
78 # ifndef NOTUNIX
79 	if (!SaveFrom && strncmp(buf, "From ", 5) == 0)
80 	{
81 		if (!flusheol(buf, InChannel))
82 			goto readerr;
83 		eatfrom(buf, e);
84 		if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock) == NULL)
85 			goto readerr;
86 		fixcrlf(buf, FALSE);
87 	}
88 # endif /* NOTUNIX */
89 
90 	/*
91 	**  Copy InChannel to temp file & do message editing.
92 	**	To keep certain mailers from getting confused,
93 	**	and to keep the output clean, lines that look
94 	**	like UNIX "From" lines are deleted in the header.
95 	*/
96 
97 	workbuf = buf;		/* `workbuf' contains a header field */
98 	freebuf = buf2;		/* `freebuf' can be used for read-ahead */
99 	for (;;)
100 	{
101 		char *curbuf;
102 		int curbuffree;
103 		register int curbuflen;
104 		char *p;
105 
106 		/* first, see if the header is over */
107 		if (!isheader(workbuf))
108 		{
109 			fixcrlf(workbuf, TRUE);
110 			break;
111 		}
112 
113 		/* if the line is too long, throw the rest away */
114 		if (!flusheol(workbuf, InChannel))
115 			goto readerr;
116 
117 		/* it's okay to toss '\n' now (flusheol() needed it) */
118 		fixcrlf(workbuf, TRUE);
119 
120 		curbuf = workbuf;
121 		curbuflen = strlen(curbuf);
122 		curbuffree = MAXLINE - curbuflen;
123 		p = curbuf + curbuflen;
124 
125 		/* get the rest of this field */
126 		for (;;)
127 		{
128 			int clen;
129 
130 			if (sfgets(freebuf, MAXLINE, InChannel, TimeOuts.to_datablock) == NULL)
131 				goto readerr;
132 
133 			/* is this a continuation line? */
134 			if (*freebuf != ' ' && *freebuf != '\t')
135 				break;
136 
137 			if (!flusheol(freebuf, InChannel))
138 				goto readerr;
139 
140 			fixcrlf(freebuf, TRUE);
141 			clen = strlen(freebuf) + 1;
142 
143 			/* if insufficient room, dynamically allocate buffer */
144 			if (clen >= curbuffree)
145 			{
146 				/* reallocate buffer */
147 				int nbuflen = ((p - curbuf) + clen) * 2;
148 				char *nbuf = xalloc(nbuflen);
149 
150 				p = nbuf + curbuflen;
151 				curbuffree = nbuflen - curbuflen;
152 				bcopy(curbuf, nbuf, curbuflen);
153 				if (curbuf != buf && curbuf != buf2)
154 					free(curbuf);
155 				curbuf = nbuf;
156 			}
157 			*p++ = '\n';
158 			bcopy(freebuf, p, clen - 1);
159 			p += clen - 1;
160 			curbuffree -= clen;
161 			curbuflen += clen;
162 		}
163 		*p++ = '\0';
164 
165 		e->e_msgsize += curbuflen;
166 
167 		/*
168 		**  The working buffer now becomes the free buffer, since
169 		**  the free buffer contains a new header field.
170 		**
171 		**  This is premature, since we still havent called
172 		**  chompheader() to process the field we just created
173 		**  (so the call to chompheader() will use `freebuf').
174 		**  This convolution is necessary so that if we break out
175 		**  of the loop due to H_EOH, `workbuf' will always be
176 		**  the next unprocessed buffer.
177 		*/
178 
179 		{
180 			register char *tmp = workbuf;
181 			workbuf = freebuf;
182 			freebuf = tmp;
183 		}
184 
185 		/*
186 		**  Snarf header away.
187 		*/
188 
189 		if (bitset(H_EOH, chompheader(curbuf, FALSE, e)))
190 			break;
191 
192 		/*
193 		**  If the buffer was dynamically allocated, free it.
194 		*/
195 
196 		if (curbuf != buf && curbuf != buf2)
197 			free(curbuf);
198 	}
199 
200 	if (tTd(30, 1))
201 		printf("EOH\n");
202 
203 	if (*workbuf == '\0')
204 	{
205 		/* throw away a blank line */
206 		if (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock) == NULL)
207 			goto readerr;
208 	}
209 	else if (workbuf == buf2)	/* guarantee `buf' contains data */
210 		(void) strcpy(buf, buf2);
211 
212 	/*
213 	**  Collect the body of the message.
214 	*/
215 
216 	do
217 	{
218 		register char *bp = buf;
219 
220 		fixcrlf(buf, TRUE);
221 
222 		/* check for end-of-message */
223 		if (!ignrdot && buf[0] == '.' && (buf[1] == '\n' || buf[1] == '\0'))
224 			break;
225 
226 		/* check for transparent dot */
227 		if (OpMode == MD_SMTP && bp[0] == '.' && bp[1] == '.')
228 			bp++;
229 
230 		/*
231 		**  Figure message length, output the line to the temp
232 		**  file, and insert a newline if missing.
233 		*/
234 
235 		e->e_msgsize += strlen(bp) + 1;
236 		fputs(bp, tf);
237 		fputs("\n", tf);
238 		if (ferror(tf))
239 			tferror(tf, e);
240 	} while (sfgets(buf, MAXLINE, InChannel, TimeOuts.to_datablock) != NULL);
241 
242 readerr:
243 	if (fflush(tf) != 0)
244 		tferror(tf, e);
245 	(void) fsync(fileno(tf));
246 	(void) fclose(tf);
247 
248 	/* An EOF when running SMTP is an error */
249 	if ((feof(InChannel) || ferror(InChannel)) && OpMode == MD_SMTP)
250 	{
251 		char *host;
252 
253 		host = RealHostName;
254 		if (host == NULL)
255 			host = "localhost";
256 
257 # ifdef LOG
258 		if (LogLevel > 0 && feof(InChannel))
259 			syslog(LOG_NOTICE,
260 			    "collect: unexpected close on connection from %s, sender=%s: %m\n",
261 			    host, e->e_from.q_paddr);
262 # endif
263 		(feof(InChannel) ? usrerr : syserr)
264 			("451 collect: unexpected close on connection from %s, from=%s",
265 				host, e->e_from.q_paddr);
266 
267 		/* don't return an error indication */
268 		e->e_to = NULL;
269 		e->e_flags &= ~EF_FATALERRS;
270 
271 		/* and don't try to deliver the partial message either */
272 		finis();
273 	}
274 
275 	/*
276 	**  Find out some information from the headers.
277 	**	Examples are who is the from person & the date.
278 	*/
279 
280 	eatheader(e, !requeueflag);
281 
282 	/*
283 	**  Add an Apparently-To: line if we have no recipient lines.
284 	*/
285 
286 	if (hvalue("to", e) == NULL && hvalue("cc", e) == NULL &&
287 	    hvalue("bcc", e) == NULL && hvalue("apparently-to", e) == NULL)
288 	{
289 		register ADDRESS *q;
290 
291 		/* create an Apparently-To: field */
292 		/*    that or reject the message.... */
293 		for (q = e->e_sendqueue; q != NULL; q = q->q_next)
294 		{
295 			if (q->q_alias != NULL)
296 				continue;
297 			if (tTd(30, 3))
298 				printf("Adding Apparently-To: %s\n", q->q_paddr);
299 			addheader("Apparently-To", q->q_paddr, e);
300 		}
301 	}
302 
303 	/* check for message too large */
304 	if (MaxMessageSize > 0 && e->e_msgsize > MaxMessageSize)
305 	{
306 		usrerr("552 Message exceeds maximum fixed size (%ld)",
307 			MaxMessageSize);
308 	}
309 
310 	if ((e->e_dfp = fopen(e->e_df, "r")) == NULL)
311 	{
312 		/* we haven't acked receipt yet, so just chuck this */
313 		syserr("Cannot reopen %s", e->e_df);
314 		finis();
315 	}
316 }
317 /*
318 **  FLUSHEOL -- if not at EOL, throw away rest of input line.
319 **
320 **	Parameters:
321 **		buf -- last line read in (checked for '\n'),
322 **		fp -- file to be read from.
323 **
324 **	Returns:
325 **		FALSE on error from sfgets(), TRUE otherwise.
326 **
327 **	Side Effects:
328 **		none.
329 */
330 
331 bool
332 flusheol(buf, fp)
333 	char *buf;
334 	FILE *fp;
335 {
336 	register char *p = buf;
337 	bool printmsg = TRUE;
338 	char junkbuf[MAXLINE];
339 
340 	while (strchr(p, '\n') == NULL)
341 	{
342 		if (printmsg)
343 			usrerr("553 header line too long");
344 		printmsg = FALSE;
345 		if (sfgets(junkbuf, MAXLINE, fp, TimeOuts.to_datablock) == NULL)
346 			return (FALSE);
347 		p = junkbuf;
348 	}
349 
350 	return (TRUE);
351 }
352 /*
353 **  TFERROR -- signal error on writing the temporary file.
354 **
355 **	Parameters:
356 **		tf -- the file pointer for the temporary file.
357 **
358 **	Returns:
359 **		none.
360 **
361 **	Side Effects:
362 **		Gives an error message.
363 **		Arranges for following output to go elsewhere.
364 */
365 
366 tferror(tf, e)
367 	FILE *tf;
368 	register ENVELOPE *e;
369 {
370 	if (errno == ENOSPC)
371 	{
372 		(void) freopen(e->e_df, "w", tf);
373 		fputs("\nMAIL DELETED BECAUSE OF LACK OF DISK SPACE\n\n", tf);
374 		usrerr("452 Out of disk space for temp file");
375 	}
376 	else
377 		syserr("collect: Cannot write %s", e->e_df);
378 	(void) freopen("/dev/null", "w", tf);
379 }
380 /*
381 **  EATFROM -- chew up a UNIX style from line and process
382 **
383 **	This does indeed make some assumptions about the format
384 **	of UNIX messages.
385 **
386 **	Parameters:
387 **		fm -- the from line.
388 **
389 **	Returns:
390 **		none.
391 **
392 **	Side Effects:
393 **		extracts what information it can from the header,
394 **		such as the date.
395 */
396 
397 # ifndef NOTUNIX
398 
399 char	*DowList[] =
400 {
401 	"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", NULL
402 };
403 
404 char	*MonthList[] =
405 {
406 	"Jan", "Feb", "Mar", "Apr", "May", "Jun",
407 	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
408 	NULL
409 };
410 
411 eatfrom(fm, e)
412 	char *fm;
413 	register ENVELOPE *e;
414 {
415 	register char *p;
416 	register char **dt;
417 
418 	if (tTd(30, 2))
419 		printf("eatfrom(%s)\n", fm);
420 
421 	/* find the date part */
422 	p = fm;
423 	while (*p != '\0')
424 	{
425 		/* skip a word */
426 		while (*p != '\0' && *p != ' ')
427 			p++;
428 		while (*p == ' ')
429 			p++;
430 		if (!(isascii(*p) && isupper(*p)) ||
431 		    p[3] != ' ' || p[13] != ':' || p[16] != ':')
432 			continue;
433 
434 		/* we have a possible date */
435 		for (dt = DowList; *dt != NULL; dt++)
436 			if (strncmp(*dt, p, 3) == 0)
437 				break;
438 		if (*dt == NULL)
439 			continue;
440 
441 		for (dt = MonthList; *dt != NULL; dt++)
442 			if (strncmp(*dt, &p[4], 3) == 0)
443 				break;
444 		if (*dt != NULL)
445 			break;
446 	}
447 
448 	if (*p != '\0')
449 	{
450 		char *q;
451 		extern char *arpadate();
452 
453 		/* we have found a date */
454 		q = xalloc(25);
455 		(void) strncpy(q, p, 25);
456 		q[24] = '\0';
457 		q = arpadate(q);
458 		define('a', newstr(q), e);
459 	}
460 }
461 
462 # endif /* NOTUNIX */
463