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
35static char sccsid[] = "@(#)fio.c 8.1 (Berkeley) 6/6/93";
36#endif /* not lint */
37
38#include "rcv.h"
39#include <sys/file.h>
40#include <sys/wait.h>
41
42#include <unistd.h>
43#include <paths.h>
44#include <errno.h>
45#include "extern.h"
46
47/*
48 * Mail -- a mail program
49 *
50 * File I/O.
51 */
52
53/*
54 * Set up the input pointers while copying the mail file into /tmp.
55 */
56void
57setptr(ibuf)
58 register FILE *ibuf;
59{
60 extern char *tmpdir;
61 register int c, count;
62 register char *cp, *cp2;
63 struct message this;
64 FILE *mestmp;
65 off_t offset;
66 int maybe, inhead;
67 char linebuf[LINESIZE];
68
69 /* Get temporary file. */
70 (void)sprintf(linebuf, "%s/mail.XXXXXX", tmpdir);
71 if ((c = mkstemp(linebuf)) == -1 ||
72 (mestmp = Fdopen(c, "r+")) == NULL) {
73 (void)fprintf(stderr, "mail: can't open %s\n", linebuf);
74 exit(1);
75 }
76 (void)unlink(linebuf);
77
78 msgCount = 0;
79 maybe = 1;
80 inhead = 0;
81 offset = 0;
82 this.m_flag = MUSED|MNEW;
83 this.m_size = 0;
84 this.m_lines = 0;
85 this.m_block = 0;
86 this.m_offset = 0;
87 for (;;) {
88 if (fgets(linebuf, LINESIZE, ibuf) == NULL) {
89 if (append(&this, mestmp)) {
90 perror("temporary file");
91 exit(1);
92 }
93 makemessage(mestmp);
94 return;
95 }
96 count = strlen(linebuf);
97 (void) fwrite(linebuf, sizeof *linebuf, count, otf);
98 if (ferror(otf)) {
99 perror("/tmp");
100 exit(1);
101 }
102 linebuf[count - 1] = 0;
103 if (maybe && linebuf[0] == 'F' && ishead(linebuf)) {
104 msgCount++;
105 if (append(&this, mestmp)) {
106 perror("temporary file");
107 exit(1);
108 }
109 this.m_flag = MUSED|MNEW;
110 this.m_size = 0;
111 this.m_lines = 0;
112 this.m_block = blockof(offset);
113 this.m_offset = offsetof(offset);
114 inhead = 1;
115 } else if (linebuf[0] == 0) {
116 inhead = 0;
117 } else if (inhead) {
118 for (cp = linebuf, cp2 = "status";; cp++) {
119 if ((c = *cp2++) == 0) {
120 while (isspace(*cp++))
121 ;
122 if (cp[-1] != ':')
123 break;
124 while (c = *cp++)
125 if (c == 'R')
126 this.m_flag |= MREAD;
127 else if (c == 'O')
128 this.m_flag &= ~MNEW;
129 inhead = 0;
130 break;
131 }
132 if (*cp != c && *cp != toupper(c))
133 break;
134 }
135 }
136 offset += count;
137 this.m_size += count;
138 this.m_lines++;
139 maybe = linebuf[0] == 0;
140 }
141}
142
143/*
144 * Drop the passed line onto the passed output buffer.
145 * If a write error occurs, return -1, else the count of
146 * characters written, including the newline.
147 */
148int
149putline(obuf, linebuf)
150 FILE *obuf;
151 char *linebuf;
152{
153 register int c;
154
155 c = strlen(linebuf);
156 (void) fwrite(linebuf, sizeof *linebuf, c, obuf);
157 (void) putc('\n', obuf);
158 if (ferror(obuf))
159 return (-1);
160 return (c + 1);
161}
162
163/*
164 * Read up a line from the specified input into the line
165 * buffer. Return the number of characters read. Do not
166 * include the newline at the end.
167 */
168int
169readline(ibuf, linebuf, linesize)
170 FILE *ibuf;
171 char *linebuf;
172 int linesize;
173{
174 register int n;
175
176 clearerr(ibuf);
177 if (fgets(linebuf, linesize, ibuf) == NULL)
178 return -1;
179 n = strlen(linebuf);
180 if (n > 0 && linebuf[n - 1] == '\n')
181 linebuf[--n] = '\0';
182 return n;
183}
184
185/*
186 * Return a file buffer all ready to read up the
187 * passed message pointer.
188 */
189FILE *
190setinput(mp)
191 register struct message *mp;
192{
193
194 fflush(otf);
195 if (fseek(itf, (long)positionof(mp->m_block, mp->m_offset), 0) < 0) {
196 perror("fseek");
197 panic("temporary file seek");
198 }
199 return (itf);
200}
201
202/*
203 * Take the data out of the passed ghost file and toss it into
204 * a dynamically allocated message structure.
205 */
206void
207makemessage(f)
208 FILE *f;
209{
210 register size = (msgCount + 1) * sizeof (struct message);
211
212 if (message != 0)
213 free((char *) message);
214 if ((message = (struct message *) malloc((unsigned) size)) == 0)
215 panic("Insufficient memory for %d messages", msgCount);
216 dot = message;
217 size -= sizeof (struct message);
218 fflush(f);
219 (void) lseek(fileno(f), (off_t)sizeof *message, 0);
220 if (read(fileno(f), (char *) message, size) != size)
221 panic("Message temporary file corrupted");
222 message[msgCount].m_size = 0;
223 message[msgCount].m_lines = 0;
224 Fclose(f);
225}
226
227/*
228 * Append the passed message descriptor onto the temp file.
229 * If the write fails, return 1, else 0
230 */
231int
232append(mp, f)
233 struct message *mp;
234 FILE *f;
235{
236 return fwrite((char *) mp, sizeof *mp, 1, f) != 1;
237}
238
239/*
240 * Delete a file, but only if the file is a plain file.
241 */
242int
243rm(name)
244 char *name;
245{
246 struct stat sb;
247
248 if (stat(name, &sb) < 0)
249 return(-1);
250 if (!S_ISREG(sb.st_mode)) {
251 errno = EISDIR;
252 return(-1);
253 }
254 return(unlink(name));
255}
256
257static int sigdepth; /* depth of holdsigs() */
258static int omask;
259/*
260 * Hold signals SIGHUP, SIGINT, and SIGQUIT.
261 */
262void
263holdsigs()
264{
265
266 if (sigdepth++ == 0)
267 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGINT)|sigmask(SIGQUIT));
268}
269
270/*
271 * Release signals SIGHUP, SIGINT, and SIGQUIT.
272 */
273void
274relsesigs()
275{
276
277 if (--sigdepth == 0)
278 sigsetmask(omask);
279}
280
281/*
282 * Determine the size of the file possessed by
283 * the passed buffer.
284 */
285off_t
286fsize(iob)
287 FILE *iob;
288{
289 struct stat sbuf;
290
291 if (fstat(fileno(iob), &sbuf) < 0)
292 return 0;
293 return sbuf.st_size;
294}
295
296/*
297 * Evaluate the string given as a new mailbox name.
298 * Supported meta characters:
299 * % for my system mail box
300 * %user for user's system mail box
301 * # for previous file
302 * & invoker's mbox file
303 * +file file in folder directory
304 * any shell meta character
305 * Return the file name as a dynamic string.
306 */
307char *
308expand(name)
309 register char *name;
310{
311 char xname[PATHSIZE];
312 char cmdbuf[PATHSIZE]; /* also used for file names */
313 register int pid, l;
314 register char *cp, *shell;
315 int pivec[2];
316 struct stat sbuf;
317 extern union wait wait_status;
318
319 /*
320 * The order of evaluation is "%" and "#" expand into constants.
321 * "&" can expand into "+". "+" can expand into shell meta characters.
322 * Shell meta characters expand into constants.
323 * This way, we make no recursive expansion.
324 */
325 switch (*name) {
326 case '%':
327 findmail(name[1] ? name + 1 : myname, xname);
328 return savestr(xname);
329 case '#':
330 if (name[1] != 0)
331 break;
332 if (prevfile[0] == 0) {
333 printf("No previous file\n");
334 return NOSTR;
335 }
336 return savestr(prevfile);
337 case '&':
338 if (name[1] == 0 && (name = value("MBOX")) == NOSTR)
339 name = "~/mbox";
340 /* fall through */
341 }
342 if (name[0] == '+' && getfold(cmdbuf) >= 0) {
343 sprintf(xname, "%s/%s", cmdbuf, name + 1);
344 name = savestr(xname);
345 }
346 /* catch the most common shell meta character */
347 if (name[0] == '~' && (name[1] == '/' || name[1] == '\0')) {
348 sprintf(xname, "%s%s", homedir, name + 1);
349 name = savestr(xname);
350 }
351 if (!anyof(name, "~{[*?$`'\"\\"))
352 return name;
353 if (pipe(pivec) < 0) {
354 perror("pipe");
355 return name;
356 }
357 sprintf(cmdbuf, "echo %s", name);
358 if ((shell = value("SHELL")) == NOSTR)
359 shell = _PATH_CSHELL;
360 pid = start_command(shell, 0, -1, pivec[1], "-c", cmdbuf, NOSTR);
361 if (pid < 0) {
362 close(pivec[0]);
363 close(pivec[1]);
364 return NOSTR;
365 }
366 close(pivec[1]);
367 l = read(pivec[0], xname, BUFSIZ);
368 close(pivec[0]);
369 if (wait_child(pid) < 0 && wait_status.w_termsig != SIGPIPE) {
370 fprintf(stderr, "\"%s\": Expansion failed.\n", name);
371 return NOSTR;
372 }
373 if (l < 0) {
374 perror("read");
375 return NOSTR;
376 }
377 if (l == 0) {
378 fprintf(stderr, "\"%s\": No match.\n", name);
379 return NOSTR;
380 }
381 if (l == BUFSIZ) {
382 fprintf(stderr, "\"%s\": Expansion buffer overflow.\n", name);
383 return NOSTR;
384 }
385 xname[l] = 0;
386 for (cp = &xname[l-1]; *cp == '\n' && cp > xname; cp--)
387 ;
388 cp[1] = '\0';
389 if (index(xname, ' ') && stat(xname, &sbuf) < 0) {
390 fprintf(stderr, "\"%s\": Ambiguous.\n", name);
391 return NOSTR;
392 }
393 return savestr(xname);
394}
395
396/*
397 * Determine the current folder directory name.
398 */
399int
400getfold(name)
401 char *name;
402{
403 char *folder;
404
405 if ((folder = value("folder")) == NOSTR)
406 return (-1);
407 if (*folder == '/')
408 strcpy(name, folder);
409 else
410 sprintf(name, "%s/%s", homedir, folder);
411 return (0);
412}
413
414/*
415 * Return the name of the dead.letter file.
416 */
417char *
418getdeadletter()
419{
420 register char *cp;
421
422 if ((cp = value("DEAD")) == NOSTR || (cp = expand(cp)) == NOSTR)
423 cp = expand("~/dead.letter");
424 else if (*cp != '/') {
425 char buf[PATHSIZE];
426
427 (void) sprintf(buf, "~/%s", cp);
428 cp = expand(buf);
429 }
430 return cp;
431}