1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef lint
33 #if 0
34 static char sccsid[] = "@(#)fio.c 8.2 (Berkeley) 4/20/95";
35 #endif
36 #endif /* not lint */
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
39
40 #include "rcv.h"
41 #include <sys/file.h>
42 #include <sys/wait.h>
43
44 #include <unistd.h>
45 #include <paths.h>
46 #include <errno.h>
47 #include "extern.h"
48
49 /*
50 * Mail -- a mail program
51 *
52 * File I/O.
53 */
54
55 extern int wait_status;
56
57 /*
58 * Set up the input pointers while copying the mail file into /tmp.
59 */
60 void
setptr(FILE * ibuf,off_t offset)61 setptr(FILE *ibuf, off_t offset)
62 {
63 int c, count;
64 char *cp, *cp2;
65 struct message this;
66 FILE *mestmp;
67 int maybe, inhead;
68 char linebuf[LINESIZE], pathbuf[PATHSIZE];
69 int omsgCount;
70
71 /* Get temporary file. */
72 (void)snprintf(pathbuf, sizeof(pathbuf), "%s/mail.XXXXXXXXXX", tmpdir);
73 if ((c = mkstemp(pathbuf)) == -1 || (mestmp = Fdopen(c, "r+")) == NULL)
74 err(1, "can't open %s", pathbuf);
75 (void)rm(pathbuf);
76
77 if (offset == 0) {
78 msgCount = 0;
79 } else {
80 /* Seek into the file to get to the new messages */
81 (void)fseeko(ibuf, offset, SEEK_SET);
82 /*
83 * We need to make "offset" a pointer to the end of
84 * the temp file that has the copy of the mail file.
85 * If any messages have been edited, this will be
86 * different from the offset into the mail file.
87 */
88 (void)fseeko(otf, (off_t)0, SEEK_END);
89 offset = ftello(otf);
90 }
91 omsgCount = msgCount;
92 maybe = 1;
93 inhead = 0;
94 this.m_flag = MUSED|MNEW;
95 this.m_size = 0;
96 this.m_lines = 0;
97 this.m_block = 0;
98 this.m_offset = 0;
99 for (;;) {
100 if (fgets(linebuf, sizeof(linebuf), ibuf) == NULL) {
101 if (append(&this, mestmp))
102 errx(1, "temporary file");
103 makemessage(mestmp, omsgCount);
104 return;
105 }
106 count = strlen(linebuf);
107 /*
108 * Transforms lines ending in <CR><LF> to just <LF>.
109 * This allows mail to be able to read Eudora mailboxes.
110 */
111 if (count >= 2 && linebuf[count - 1] == '\n' &&
112 linebuf[count - 2] == '\r') {
113 count--;
114 linebuf[count - 1] = '\n';
115 }
116
117 (void)fwrite(linebuf, sizeof(*linebuf), count, otf);
118 if (ferror(otf))
119 errx(1, "/tmp");
120 if (count)
121 linebuf[count - 1] = '\0';
122 if (maybe && linebuf[0] == 'F' && ishead(linebuf)) {
123 msgCount++;
124 if (append(&this, mestmp))
125 errx(1, "temporary file");
126 this.m_flag = MUSED|MNEW;
127 this.m_size = 0;
128 this.m_lines = 0;
129 this.m_block = blockof(offset);
130 this.m_offset = boffsetof(offset);
131 inhead = 1;
132 } else if (linebuf[0] == 0) {
133 inhead = 0;
134 } else if (inhead) {
135 for (cp = linebuf, cp2 = "status";; cp++) {
136 if ((c = *cp2++) == '\0') {
137 while (isspace((unsigned char)*cp++))
138 ;
139 if (cp[-1] != ':')
140 break;
141 while ((c = *cp++) != '\0')
142 if (c == 'R')
143 this.m_flag |= MREAD;
144 else if (c == 'O')
145 this.m_flag &= ~MNEW;
146 inhead = 0;
147 break;
148 }
149 if (*cp != c && *cp != toupper((unsigned char)c))
150 break;
151 }
152 }
153 offset += count;
154 this.m_size += count;
155 this.m_lines++;
156 maybe = linebuf[0] == 0;
157 }
158 }
159
160 /*
161 * Drop the passed line onto the passed output buffer.
162 * If a write error occurs, return -1, else the count of
163 * characters written, including the newline if requested.
164 */
165 int
putline(FILE * obuf,char * linebuf,int outlf)166 putline(FILE *obuf, char *linebuf, int outlf)
167 {
168 int c;
169
170 c = strlen(linebuf);
171 (void)fwrite(linebuf, sizeof(*linebuf), c, obuf);
172 if (outlf) {
173 fprintf(obuf, "\n");
174 c++;
175 }
176 if (ferror(obuf))
177 return (-1);
178 return (c);
179 }
180
181 /*
182 * Read up a line from the specified input into the line
183 * buffer. Return the number of characters read. Do not
184 * include the newline (or carriage return) at the end.
185 */
186 int
readline(FILE * ibuf,char * linebuf,int linesize)187 readline(FILE *ibuf, char *linebuf, int linesize)
188 {
189 int n;
190
191 clearerr(ibuf);
192 if (fgets(linebuf, linesize, ibuf) == NULL)
193 return (-1);
194 n = strlen(linebuf);
195 if (n > 0 && linebuf[n - 1] == '\n')
196 linebuf[--n] = '\0';
197 if (n > 0 && linebuf[n - 1] == '\r')
198 linebuf[--n] = '\0';
199 return (n);
200 }
201
202 /*
203 * Return a file buffer all ready to read up the
204 * passed message pointer.
205 */
206 FILE *
setinput(struct message * mp)207 setinput(struct message *mp)
208 {
209
210 (void)fflush(otf);
211 if (fseeko(itf,
212 positionof(mp->m_block, mp->m_offset), SEEK_SET) < 0)
213 err(1, "fseeko");
214 return (itf);
215 }
216
217 /*
218 * Take the data out of the passed ghost file and toss it into
219 * a dynamically allocated message structure.
220 */
221 void
makemessage(FILE * f,int omsgCount)222 makemessage(FILE *f, int omsgCount)
223 {
224 size_t size;
225 struct message *nmessage;
226
227 size = (msgCount + 1) * sizeof(struct message);
228 nmessage = (struct message *)realloc(message, size);
229 if (nmessage == NULL)
230 errx(1, "Insufficient memory for %d messages\n",
231 msgCount);
232 if (omsgCount == 0 || message == NULL)
233 dot = nmessage;
234 else
235 dot = nmessage + (dot - message);
236 message = nmessage;
237 size -= (omsgCount + 1) * sizeof(struct message);
238 (void)fflush(f);
239 (void)lseek(fileno(f), (off_t)sizeof(*message), 0);
240 if (read(fileno(f), (void *)&message[omsgCount], size) != size)
241 errx(1, "Message temporary file corrupted");
242 message[msgCount].m_size = 0;
243 message[msgCount].m_lines = 0;
244 (void)Fclose(f);
245 }
246
247 /*
248 * Append the passed message descriptor onto the temp file.
249 * If the write fails, return 1, else 0
250 */
251 int
append(struct message * mp,FILE * f)252 append(struct message *mp, FILE *f)
253 {
254 return (fwrite((char *)mp, sizeof(*mp), 1, f) != 1);
255 }
256
257 /*
258 * Delete a file, but only if the file is a plain file.
259 */
260 int
rm(char * name)261 rm(char *name)
262 {
263 struct stat sb;
264
265 if (stat(name, &sb) < 0)
266 return (-1);
267 if (!S_ISREG(sb.st_mode)) {
268 errno = EISDIR;
269 return (-1);
270 }
271 return (unlink(name));
272 }
273
274 static int sigdepth; /* depth of holdsigs() */
275 static sigset_t nset, oset;
276 /*
277 * Hold signals SIGHUP, SIGINT, and SIGQUIT.
278 */
279 void
holdsigs(void)280 holdsigs(void)
281 {
282
283 if (sigdepth++ == 0) {
284 (void)sigemptyset(&nset);
285 (void)sigaddset(&nset, SIGHUP);
286 (void)sigaddset(&nset, SIGINT);
287 (void)sigaddset(&nset, SIGQUIT);
288 (void)sigprocmask(SIG_BLOCK, &nset, &oset);
289 }
290 }
291
292 /*
293 * Release signals SIGHUP, SIGINT, and SIGQUIT.
294 */
295 void
relsesigs(void)296 relsesigs(void)
297 {
298
299 if (--sigdepth == 0)
300 (void)sigprocmask(SIG_SETMASK, &oset, NULL);
301 }
302
303 /*
304 * Determine the size of the file possessed by
305 * the passed buffer.
306 */
307 off_t
fsize(FILE * iob)308 fsize(FILE *iob)
309 {
310 struct stat sbuf;
311
312 if (fstat(fileno(iob), &sbuf) < 0)
313 return (0);
314 return (sbuf.st_size);
315 }
316
317 /*
318 * Evaluate the string given as a new mailbox name.
319 * Supported meta characters:
320 * % for my system mail box
321 * %user for user's system mail box
322 * # for previous file
323 * & invoker's mbox file
324 * +file file in folder directory
325 * any shell meta character
326 * Return the file name as a dynamic string.
327 */
328 char *
expand(char * name)329 expand(char *name)
330 {
331 char xname[PATHSIZE];
332 char cmdbuf[PATHSIZE]; /* also used for file names */
333 int pid, l;
334 char *cp, *sh;
335 int pivec[2];
336 struct stat sbuf;
337
338 /*
339 * The order of evaluation is "%" and "#" expand into constants.
340 * "&" can expand into "+". "+" can expand into shell meta characters.
341 * Shell meta characters expand into constants.
342 * This way, we make no recursive expansion.
343 */
344 switch (*name) {
345 case '%':
346 findmail(name[1] ? name + 1 : myname, xname, sizeof(xname));
347 return (savestr(xname));
348 case '#':
349 if (name[1] != 0)
350 break;
351 if (prevfile[0] == 0) {
352 printf("No previous file\n");
353 return (NULL);
354 }
355 return (savestr(prevfile));
356 case '&':
357 if (name[1] == 0 && (name = value("MBOX")) == NULL)
358 name = "~/mbox";
359 /* fall through */
360 }
361 if (name[0] == '+' && getfold(cmdbuf, sizeof(cmdbuf)) >= 0) {
362 (void)snprintf(xname, sizeof(xname), "%s/%s", cmdbuf, name + 1);
363 name = savestr(xname);
364 }
365 /* catch the most common shell meta character */
366 if (name[0] == '~' && homedir != NULL &&
367 (name[1] == '/' || name[1] == '\0')) {
368 (void)snprintf(xname, sizeof(xname), "%s%s", homedir, name + 1);
369 name = savestr(xname);
370 }
371 if (!strpbrk(name, "~{[*?$`'\"\\"))
372 return (savestr(name));
373 if (pipe(pivec) < 0) {
374 warn("pipe");
375 return (NULL);
376 }
377 (void)snprintf(cmdbuf, sizeof(cmdbuf), "echo %s", name);
378 if ((sh = value("SHELL")) == NULL)
379 sh = _PATH_CSHELL;
380 pid = start_command(sh, 0, -1, pivec[1], "-c", cmdbuf, NULL);
381 if (pid < 0) {
382 (void)close(pivec[0]);
383 (void)close(pivec[1]);
384 return (NULL);
385 }
386 (void)close(pivec[1]);
387 l = read(pivec[0], xname, BUFSIZ);
388 (void)close(pivec[0]);
389 if (wait_child(pid) < 0 && WIFSIGNALED(wait_status) &&
390 WTERMSIG(wait_status) != SIGPIPE) {
391 fprintf(stderr, "\"%s\": Expansion failed.\n", name);
392 return (NULL);
393 }
394 if (l < 0) {
395 warn("read");
396 return (NULL);
397 }
398 if (l == 0) {
399 fprintf(stderr, "\"%s\": No match.\n", name);
400 return (NULL);
401 }
402 if (l == BUFSIZ) {
403 fprintf(stderr, "\"%s\": Expansion buffer overflow.\n", name);
404 return (NULL);
405 }
406 xname[l] = '\0';
407 for (cp = &xname[l-1]; *cp == '\n' && cp > xname; cp--)
408 ;
409 cp[1] = '\0';
410 if (strchr(xname, ' ') && stat(xname, &sbuf) < 0) {
411 fprintf(stderr, "\"%s\": Ambiguous.\n", name);
412 return (NULL);
413 }
414 return (savestr(xname));
415 }
416
417 /*
418 * Determine the current folder directory name.
419 */
420 int
getfold(char * name,int namelen)421 getfold(char *name, int namelen)
422 {
423 char *folder;
424 int copylen;
425
426 if ((folder = value("folder")) == NULL)
427 return (-1);
428 if (*folder == '/')
429 copylen = strlcpy(name, folder, namelen);
430 else
431 copylen = snprintf(name, namelen, "%s/%s",
432 homedir ? homedir : ".", folder);
433 return (copylen < 0 || copylen >= namelen ? (-1) : (0));
434 }
435
436 /*
437 * Return the name of the dead.letter file.
438 */
439 char *
getdeadletter(void)440 getdeadletter(void)
441 {
442 char *cp;
443
444 if ((cp = value("DEAD")) == NULL || (cp = expand(cp)) == NULL)
445 cp = expand("~/dead.letter");
446 else if (*cp != '/') {
447 char buf[PATHSIZE];
448
449 (void)snprintf(buf, sizeof(buf), "~/%s", cp);
450 cp = expand(buf);
451 }
452 return (cp);
453 }
454