fio.c revision 81979 
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 81979 2001-08-20 14:46:40Z brian $";
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 (fseek(itf, (long)positionof(mp->m_block, mp->m_offset), 0) < 0)
205		err(1, "fseek");
206	return (itf);
207}
208
209/*
210 * Take the data out of the passed ghost file and toss it into
211 * a dynamically allocated message structure.
212 */
213void
214makemessage(f)
215	FILE *f;
216{
217	int size = (msgCount + 1) * sizeof(struct message);
218
219	if (message != 0)
220		(void)free(message);
221	if ((message = malloc((unsigned)size)) == NULL)
222		err(1, "Out of memory");
223	dot = message;
224	size -= sizeof(struct message);
225	(void)fflush(f);
226	(void)lseek(fileno(f), (off_t)sizeof(*message), 0);
227	if (read(fileno(f), (char *)message, size) != size)
228		errx(1, "Message temporary file corrupted");
229	message[msgCount].m_size = 0;
230	message[msgCount].m_lines = 0;
231	(void)Fclose(f);
232}
233
234/*
235 * Append the passed message descriptor onto the temp file.
236 * If the write fails, return 1, else 0
237 */
238int
239append(mp, f)
240	struct message *mp;
241	FILE *f;
242{
243	return (fwrite((char *)mp, sizeof(*mp), 1, f) != 1);
244}
245
246/*
247 * Delete a file, but only if the file is a plain file.
248 */
249int
250rm(name)
251	char *name;
252{
253	struct stat sb;
254
255	if (stat(name, &sb) < 0)
256		return (-1);
257	if (!S_ISREG(sb.st_mode)) {
258		errno = EISDIR;
259		return (-1);
260	}
261	return (unlink(name));
262}
263
264static int sigdepth;		/* depth of holdsigs() */
265static int omask;
266/*
267 * Hold signals SIGHUP, SIGINT, and SIGQUIT.
268 */
269void
270holdsigs()
271{
272
273	if (sigdepth++ == 0)
274		omask = sigblock(sigmask(SIGHUP)|sigmask(SIGINT)|sigmask(SIGQUIT));
275}
276
277/*
278 * Release signals SIGHUP, SIGINT, and SIGQUIT.
279 */
280void
281relsesigs()
282{
283
284	if (--sigdepth == 0)
285		(void)sigsetmask(omask);
286}
287
288/*
289 * Determine the size of the file possessed by
290 * the passed buffer.
291 */
292off_t
293fsize(iob)
294	FILE *iob;
295{
296	struct stat sbuf;
297
298	if (fstat(fileno(iob), &sbuf) < 0)
299		return (0);
300	return (sbuf.st_size);
301}
302
303/*
304 * Evaluate the string given as a new mailbox name.
305 * Supported meta characters:
306 *	%	for my system mail box
307 *	%user	for user's system mail box
308 *	#	for previous file
309 *	&	invoker's mbox file
310 *	+file	file in folder directory
311 *	any shell meta character
312 * Return the file name as a dynamic string.
313 */
314char *
315expand(name)
316	char *name;
317{
318	char xname[PATHSIZE];
319	char cmdbuf[PATHSIZE];		/* also used for file names */
320	int pid, l;
321	char *cp, *sh;
322	int pivec[2];
323	struct stat sbuf;
324
325	/*
326	 * The order of evaluation is "%" and "#" expand into constants.
327	 * "&" can expand into "+".  "+" can expand into shell meta characters.
328	 * Shell meta characters expand into constants.
329	 * This way, we make no recursive expansion.
330	 */
331	switch (*name) {
332	case '%':
333		findmail(name[1] ? name + 1 : myname, xname, sizeof(xname));
334		return (savestr(xname));
335	case '#':
336		if (name[1] != 0)
337			break;
338		if (prevfile[0] == 0) {
339			printf("No previous file\n");
340			return (NULL);
341		}
342		return (savestr(prevfile));
343	case '&':
344		if (name[1] == 0 && (name = value("MBOX")) == NULL)
345			name = "~/mbox";
346		/* fall through */
347	}
348	if (name[0] == '+' && getfold(cmdbuf, sizeof(cmdbuf)) >= 0) {
349		(void)snprintf(xname, sizeof(xname), "%s/%s", cmdbuf, name + 1);
350		name = savestr(xname);
351	}
352	/* catch the most common shell meta character */
353	if (name[0] == '~' && homedir != NULL &&
354	    (name[1] == '/' || name[1] == '\0')) {
355		(void)snprintf(xname, sizeof(xname), "%s%s", homedir, name + 1);
356		name = savestr(xname);
357	}
358	if (!strpbrk(name, "~{[*?$`'\"\\"))
359		return (name);
360	if (pipe(pivec) < 0) {
361		warn("pipe");
362		return (name);
363	}
364	(void)snprintf(cmdbuf, sizeof(cmdbuf), "echo %s", name);
365	if ((sh = value("SHELL")) == NULL)
366		sh = _PATH_CSHELL;
367	pid = start_command(sh, 0, -1, pivec[1], "-c", cmdbuf, NULL);
368	if (pid < 0) {
369		(void)close(pivec[0]);
370		(void)close(pivec[1]);
371		return (NULL);
372	}
373	(void)close(pivec[1]);
374	l = read(pivec[0], xname, BUFSIZ);
375	(void)close(pivec[0]);
376	if (wait_child(pid) < 0 && WIFSIGNALED(wait_status) &&
377	    WTERMSIG(wait_status) != SIGPIPE) {
378		fprintf(stderr, "\"%s\": Expansion failed.\n", name);
379		return (NULL);
380	}
381	if (l < 0) {
382		warn("read");
383		return (NULL);
384	}
385	if (l == 0) {
386		fprintf(stderr, "\"%s\": No match.\n", name);
387		return (NULL);
388	}
389	if (l == BUFSIZ) {
390		fprintf(stderr, "\"%s\": Expansion buffer overflow.\n", name);
391		return (NULL);
392	}
393	xname[l] = '\0';
394	for (cp = &xname[l-1]; *cp == '\n' && cp > xname; cp--)
395		;
396	cp[1] = '\0';
397	if (strchr(xname, ' ') && stat(xname, &sbuf) < 0) {
398		fprintf(stderr, "\"%s\": Ambiguous.\n", name);
399		return (NULL);
400	}
401	return (savestr(xname));
402}
403
404/*
405 * Determine the current folder directory name.
406 */
407int
408getfold(name, namelen)
409	char *name;
410	int namelen;
411{
412	char *folder;
413	int copylen;
414
415	if ((folder = value("folder")) == NULL)
416		return (-1);
417	if (*folder == '/')
418		copylen = strlcpy(name, folder, namelen);
419	else
420		copylen = snprintf(name, namelen, "%s/%s",
421		    homedir ? homedir : ".", folder);
422	return (copylen < 0 || copylen >= namelen ? (-1) : (0));
423}
424
425/*
426 * Return the name of the dead.letter file.
427 */
428char *
429getdeadletter()
430{
431	char *cp;
432
433	if ((cp = value("DEAD")) == NULL || (cp = expand(cp)) == NULL)
434		cp = expand("~/dead.letter");
435	else if (*cp != '/') {
436		char buf[PATHSIZE];
437
438		(void)snprintf(buf, sizeof(buf), "~/%s", cp);
439		cp = expand(buf);
440	}
441	return (cp);
442}
443