fio.c revision 82793 
1/*
2 * Copyright (c) 1980, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35#if 0
36static char sccsid[] = "@(#)fio.c	8.1 (Berkeley) 6/6/93";
37#endif
38static const char rcsid[] =
39  "$FreeBSD: head/usr.bin/mail/fio.c 82793 2001-09-02 14:40:51Z ache $";
40#endif /* not lint */
41
42#include "rcv.h"
43#include <sys/file.h>
44#include <sys/wait.h>
45
46#include <unistd.h>
47#include <paths.h>
48#include <errno.h>
49#include "extern.h"
50
51/*
52 * Mail -- a mail program
53 *
54 * File I/O.
55 */
56
57extern int wait_status;
58
59/*
60 * Set up the input pointers while copying the mail file into /tmp.
61 */
62void
63setptr(ibuf)
64	FILE *ibuf;
65{
66	int c, count;
67	char *cp, *cp2;
68	struct message this;
69	FILE *mestmp;
70	off_t offset;
71	int maybe, inhead;
72	char linebuf[LINESIZE], pathbuf[PATHSIZE];
73
74	/* Get temporary file. */
75	(void)snprintf(pathbuf, sizeof(pathbuf), "%s/mail.XXXXXXXXXX", tmpdir);
76	if ((c = mkstemp(pathbuf)) == -1 || (mestmp = Fdopen(c, "r+")) == NULL)
77		err(1, "can't open %s", pathbuf);
78	(void)rm(pathbuf);
79
80	msgCount = 0;
81	maybe = 1;
82	inhead = 0;
83	offset = 0;
84	this.m_flag = MUSED|MNEW;
85	this.m_size = 0;
86	this.m_lines = 0;
87	this.m_block = 0;
88	this.m_offset = 0;
89	for (;;) {
90		if (fgets(linebuf, sizeof(linebuf), ibuf) == NULL) {
91			if (append(&this, mestmp))
92				errx(1, "temporary file");
93			makemessage(mestmp);
94			return;
95		}
96		count = strlen(linebuf);
97		/*
98		 * Transforms lines ending in <CR><LF> to just <LF>.
99		 * This allows mail to be able to read Eudora mailboxes.
100		 */
101		if (count >= 2 && linebuf[count - 1] == '\n' &&
102		    linebuf[count - 2] == '\r') {
103			count--;
104			linebuf[count - 1] = '\n';
105		}
106
107		(void)fwrite(linebuf, sizeof(*linebuf), count, otf);
108		if (ferror(otf))
109			errx(1, "/tmp");
110		if (count)
111			linebuf[count - 1] = '\0';
112		if (maybe && linebuf[0] == 'F' && ishead(linebuf)) {
113			msgCount++;
114			if (append(&this, mestmp))
115				errx(1, "temporary file");
116			this.m_flag = MUSED|MNEW;
117			this.m_size = 0;
118			this.m_lines = 0;
119			this.m_block = blockof(offset);
120			this.m_offset = boffsetof(offset);
121			inhead = 1;
122		} else if (linebuf[0] == 0) {
123			inhead = 0;
124		} else if (inhead) {
125			for (cp = linebuf, cp2 = "status";; cp++) {
126				if ((c = *cp2++) == '\0') {
127					while (isspace(*cp++))
128						;
129					if (cp[-1] != ':')
130						break;
131					while ((c = *cp++) != '\0')
132						if (c == 'R')
133							this.m_flag |= MREAD;
134						else if (c == 'O')
135							this.m_flag &= ~MNEW;
136					inhead = 0;
137					break;
138				}
139				if (*cp != c && *cp != toupper(c))
140					break;
141			}
142		}
143		offset += count;
144		this.m_size += count;
145		this.m_lines++;
146		maybe = linebuf[0] == 0;
147	}
148}
149
150/*
151 * Drop the passed line onto the passed output buffer.
152 * If a write error occurs, return -1, else the count of
153 * characters written, including the newline.
154 */
155int
156putline(obuf, linebuf)
157	FILE *obuf;
158	char *linebuf;
159{
160	int c;
161
162	c = strlen(linebuf);
163	(void)fwrite(linebuf, sizeof(*linebuf), c, obuf);
164	fprintf(obuf, "\n");
165	if (ferror(obuf))
166		return (-1);
167	return (c + 1);
168}
169
170/*
171 * Read up a line from the specified input into the line
172 * buffer.  Return the number of characters read.  Do not
173 * include the newline (or carriage return) at the end.
174 */
175int
176readline(ibuf, linebuf, linesize)
177	FILE *ibuf;
178	char *linebuf;
179	int linesize;
180{
181	int n;
182
183	clearerr(ibuf);
184	if (fgets(linebuf, linesize, ibuf) == NULL)
185		return (-1);
186	n = strlen(linebuf);
187	if (n > 0 && linebuf[n - 1] == '\n')
188		linebuf[--n] = '\0';
189	if (n > 0 && linebuf[n - 1] == '\r')
190		linebuf[--n] = '\0';
191	return (n);
192}
193
194/*
195 * Return a file buffer all ready to read up the
196 * passed message pointer.
197 */
198FILE *
199setinput(mp)
200	struct message *mp;
201{
202
203	(void)fflush(otf);
204	if (fseeko(itf,
205		   positionof(mp->m_block, mp->m_offset), SEEK_SET) < 0)
206		err(1, "fseek");
207	return (itf);
208}
209
210/*
211 * Take the data out of the passed ghost file and toss it into
212 * a dynamically allocated message structure.
213 */
214void
215makemessage(f)
216	FILE *f;
217{
218	int size = (msgCount + 1) * sizeof(struct message);
219
220	if (message != 0)
221		(void)free(message);
222	if ((message = malloc((unsigned)size)) == NULL)
223		err(1, "Out of memory");
224	dot = message;
225	size -= sizeof(struct message);
226	(void)fflush(f);
227	(void)lseek(fileno(f), (off_t)sizeof(*message), 0);
228	if (read(fileno(f), (char *)message, size) != size)
229		errx(1, "Message temporary file corrupted");
230	message[msgCount].m_size = 0;
231	message[msgCount].m_lines = 0;
232	(void)Fclose(f);
233}
234
235/*
236 * Append the passed message descriptor onto the temp file.
237 * If the write fails, return 1, else 0
238 */
239int
240append(mp, f)
241	struct message *mp;
242	FILE *f;
243{
244	return (fwrite((char *)mp, sizeof(*mp), 1, f) != 1);
245}
246
247/*
248 * Delete a file, but only if the file is a plain file.
249 */
250int
251rm(name)
252	char *name;
253{
254	struct stat sb;
255
256	if (stat(name, &sb) < 0)
257		return (-1);
258	if (!S_ISREG(sb.st_mode)) {
259		errno = EISDIR;
260		return (-1);
261	}
262	return (unlink(name));
263}
264
265static int sigdepth;		/* depth of holdsigs() */
266static int omask;
267/*
268 * Hold signals SIGHUP, SIGINT, and SIGQUIT.
269 */
270void
271holdsigs()
272{
273
274	if (sigdepth++ == 0)
275		omask = sigblock(sigmask(SIGHUP)|sigmask(SIGINT)|sigmask(SIGQUIT));
276}
277
278/*
279 * Release signals SIGHUP, SIGINT, and SIGQUIT.
280 */
281void
282relsesigs()
283{
284
285	if (--sigdepth == 0)
286		(void)sigsetmask(omask);
287}
288
289/*
290 * Determine the size of the file possessed by
291 * the passed buffer.
292 */
293off_t
294fsize(iob)
295	FILE *iob;
296{
297	struct stat sbuf;
298
299	if (fstat(fileno(iob), &sbuf) < 0)
300		return (0);
301	return (sbuf.st_size);
302}
303
304/*
305 * Evaluate the string given as a new mailbox name.
306 * Supported meta characters:
307 *	%	for my system mail box
308 *	%user	for user's system mail box
309 *	#	for previous file
310 *	&	invoker's mbox file
311 *	+file	file in folder directory
312 *	any shell meta character
313 * Return the file name as a dynamic string.
314 */
315char *
316expand(name)
317	char *name;
318{
319	char xname[PATHSIZE];
320	char cmdbuf[PATHSIZE];		/* also used for file names */
321	int pid, l;
322	char *cp, *sh;
323	int pivec[2];
324	struct stat sbuf;
325
326	/*
327	 * The order of evaluation is "%" and "#" expand into constants.
328	 * "&" can expand into "+".  "+" can expand into shell meta characters.
329	 * Shell meta characters expand into constants.
330	 * This way, we make no recursive expansion.
331	 */
332	switch (*name) {
333	case '%':
334		findmail(name[1] ? name + 1 : myname, xname, sizeof(xname));
335		return (savestr(xname));
336	case '#':
337		if (name[1] != 0)
338			break;
339		if (prevfile[0] == 0) {
340			printf("No previous file\n");
341			return (NULL);
342		}
343		return (savestr(prevfile));
344	case '&':
345		if (name[1] == 0 && (name = value("MBOX")) == NULL)
346			name = "~/mbox";
347		/* fall through */
348	}
349	if (name[0] == '+' && getfold(cmdbuf, sizeof(cmdbuf)) >= 0) {
350		(void)snprintf(xname, sizeof(xname), "%s/%s", cmdbuf, name + 1);
351		name = savestr(xname);
352	}
353	/* catch the most common shell meta character */
354	if (name[0] == '~' && homedir != NULL &&
355	    (name[1] == '/' || name[1] == '\0')) {
356		(void)snprintf(xname, sizeof(xname), "%s%s", homedir, name + 1);
357		name = savestr(xname);
358	}
359	if (!strpbrk(name, "~{[*?$`'\"\\"))
360		return (name);
361	if (pipe(pivec) < 0) {
362		warn("pipe");
363		return (name);
364	}
365	(void)snprintf(cmdbuf, sizeof(cmdbuf), "echo %s", name);
366	if ((sh = value("SHELL")) == NULL)
367		sh = _PATH_CSHELL;
368	pid = start_command(sh, 0, -1, pivec[1], "-c", cmdbuf, NULL);
369	if (pid < 0) {
370		(void)close(pivec[0]);
371		(void)close(pivec[1]);
372		return (NULL);
373	}
374	(void)close(pivec[1]);
375	l = read(pivec[0], xname, BUFSIZ);
376	(void)close(pivec[0]);
377	if (wait_child(pid) < 0 && WIFSIGNALED(wait_status) &&
378	    WTERMSIG(wait_status) != SIGPIPE) {
379		fprintf(stderr, "\"%s\": Expansion failed.\n", name);
380		return (NULL);
381	}
382	if (l < 0) {
383		warn("read");
384		return (NULL);
385	}
386	if (l == 0) {
387		fprintf(stderr, "\"%s\": No match.\n", name);
388		return (NULL);
389	}
390	if (l == BUFSIZ) {
391		fprintf(stderr, "\"%s\": Expansion buffer overflow.\n", name);
392		return (NULL);
393	}
394	xname[l] = '\0';
395	for (cp = &xname[l-1]; *cp == '\n' && cp > xname; cp--)
396		;
397	cp[1] = '\0';
398	if (strchr(xname, ' ') && stat(xname, &sbuf) < 0) {
399		fprintf(stderr, "\"%s\": Ambiguous.\n", name);
400		return (NULL);
401	}
402	return (savestr(xname));
403}
404
405/*
406 * Determine the current folder directory name.
407 */
408int
409getfold(name, namelen)
410	char *name;
411	int namelen;
412{
413	char *folder;
414	int copylen;
415
416	if ((folder = value("folder")) == NULL)
417		return (-1);
418	if (*folder == '/')
419		copylen = strlcpy(name, folder, namelen);
420	else
421		copylen = snprintf(name, namelen, "%s/%s",
422		    homedir ? homedir : ".", folder);
423	return (copylen < 0 || copylen >= namelen ? (-1) : (0));
424}
425
426/*
427 * Return the name of the dead.letter file.
428 */
429char *
430getdeadletter()
431{
432	char *cp;
433
434	if ((cp = value("DEAD")) == NULL || (cp = expand(cp)) == NULL)
435		cp = expand("~/dead.letter");
436	else if (*cp != '/') {
437		char buf[PATHSIZE];
438
439		(void)snprintf(buf, sizeof(buf), "~/%s", cp);
440		cp = expand(buf);
441	}
442	return (cp);
443}
444