Annotation of src/usr.bin/mail/fio.c, Revision 1.32
1.32 ! deraadt 1: /* $OpenBSD: fio.c,v 1.31 2008/07/16 14:49:09 martynas Exp $ */
1.6 millert 2: /* $NetBSD: fio.c,v 1.8 1997/07/07 22:57:55 phil Exp $ */
1.2 deraadt 3:
1.1 deraadt 4: /*
5: * Copyright (c) 1980, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
1.23 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #include "rcv.h"
34: #include <sys/file.h>
35: #include <sys/wait.h>
36:
37: #include <unistd.h>
38: #include <paths.h>
39: #include <errno.h>
40: #include "extern.h"
41:
42: /*
43: * Mail -- a mail program
44: *
45: * File I/O.
46: */
47:
1.19 millert 48: static volatile sig_atomic_t fiosignal;
49:
1.1 deraadt 50: /*
1.18 millert 51: * Wrapper for read() to catch EINTR.
52: */
1.24 deraadt 53: static ssize_t
1.20 millert 54: myread(int fd, char *buf, int len)
1.18 millert 55: {
56: ssize_t nread;
57:
58: while ((nread = read(fd, buf, len)) == -1 && errno == EINTR)
59: ;
60: return(nread);
61: }
62:
63: /*
1.1 deraadt 64: * Set up the input pointers while copying the mail file into /tmp.
65: */
66: void
1.20 millert 67: setptr(FILE *ibuf, off_t offset)
1.1 deraadt 68: {
1.14 millert 69: int c, count;
70: char *cp, *cp2;
1.1 deraadt 71: struct message this;
72: FILE *mestmp;
1.14 millert 73: int maybe, inhead, omsgCount;
1.5 deraadt 74: char linebuf[LINESIZE], pathbuf[PATHSIZE];
1.1 deraadt 75:
76: /* Get temporary file. */
1.6 millert 77: (void)snprintf(pathbuf, sizeof(pathbuf), "%s/mail.XXXXXXXXXX", tmpdir);
78: if ((c = mkstemp(pathbuf)) == -1 || (mestmp = Fdopen(c, "r+")) == NULL)
79: err(1, "can't open %s", pathbuf);
1.10 millert 80: (void)rm(pathbuf);
1.1 deraadt 81:
1.6 millert 82: if (offset == 0) {
83: msgCount = 0;
84: } else {
85: /* Seek into the file to get to the new messages */
1.29 tobias 86: (void)fseeko(ibuf, offset, SEEK_SET);
1.6 millert 87: /*
88: * We need to make "offset" a pointer to the end of
89: * the temp file that has the copy of the mail file.
90: * If any messages have been edited, this will be
91: * different from the offset into the mail file.
92: */
1.25 deraadt 93: (void)fseeko(otf, (off_t)0, SEEK_END);
1.6 millert 94: offset = ftell(otf);
95: }
96: omsgCount = msgCount;
1.1 deraadt 97: maybe = 1;
98: inhead = 0;
99: this.m_flag = MUSED|MNEW;
100: this.m_size = 0;
101: this.m_lines = 0;
102: this.m_block = 0;
103: this.m_offset = 0;
104: for (;;) {
1.6 millert 105: if (fgets(linebuf, sizeof(linebuf), ibuf) == NULL) {
106: if (append(&this, mestmp))
107: err(1, "temporary file");
108: makemessage(mestmp, omsgCount);
1.1 deraadt 109: return;
110: }
111: count = strlen(linebuf);
1.13 millert 112: /*
113: * Transforms lines ending in <CR><LF> to just <LF>.
114: * This allows mail to be able to read Eudora mailboxes
115: * that reside on a DOS partition.
116: */
117: if (count >= 2 && linebuf[count-1] == '\n' &&
1.27 ray 118: linebuf[count - 2] == '\r') {
119: linebuf[count - 2] = '\n';
120: linebuf[count - 1] = '\0';
121: count--;
122: }
1.13 millert 123:
1.7 millert 124: (void)fwrite(linebuf, sizeof(*linebuf), count, otf);
1.6 millert 125: if (ferror(otf))
1.31 martynas 126: err(1, "%s", pathbuf);
1.30 chl 127: if (count && linebuf[count - 1] == '\n')
1.15 deraadt 128: linebuf[count - 1] = '\0';
1.1 deraadt 129: if (maybe && linebuf[0] == 'F' && ishead(linebuf)) {
130: msgCount++;
1.6 millert 131: if (append(&this, mestmp))
132: err(1, "temporary file");
1.1 deraadt 133: this.m_flag = MUSED|MNEW;
134: this.m_size = 0;
135: this.m_lines = 0;
136: this.m_block = blockof(offset);
137: this.m_offset = offsetof(offset);
138: inhead = 1;
139: } else if (linebuf[0] == 0) {
140: inhead = 0;
141: } else if (inhead) {
142: for (cp = linebuf, cp2 = "status";; cp++) {
143: if ((c = *cp2++) == 0) {
144: while (isspace(*cp++))
145: ;
146: if (cp[-1] != ':')
147: break;
1.2 deraadt 148: while ((c = *cp++) != '\0')
1.1 deraadt 149: if (c == 'R')
150: this.m_flag |= MREAD;
151: else if (c == 'O')
152: this.m_flag &= ~MNEW;
153: inhead = 0;
154: break;
155: }
156: if (*cp != c && *cp != toupper(c))
157: break;
158: }
159: }
160: offset += count;
161: this.m_size += count;
162: this.m_lines++;
163: maybe = linebuf[0] == 0;
164: }
165: }
166:
167: /*
168: * Drop the passed line onto the passed output buffer.
169: * If a write error occurs, return -1, else the count of
1.6 millert 170: * characters written, including the newline if requested.
1.1 deraadt 171: */
172: int
1.20 millert 173: putline(FILE *obuf, char *linebuf, int outlf)
1.1 deraadt 174: {
1.14 millert 175: int c;
1.1 deraadt 176:
177: c = strlen(linebuf);
1.7 millert 178: (void)fwrite(linebuf, sizeof(*linebuf), c, obuf);
1.6 millert 179: if (outlf) {
1.7 millert 180: (void)putc('\n', obuf);
1.6 millert 181: c++;
182: }
1.1 deraadt 183: if (ferror(obuf))
1.6 millert 184: return(-1);
185: return(c);
1.1 deraadt 186: }
187:
188: /*
189: * Read up a line from the specified input into the line
190: * buffer. Return the number of characters read. Do not
1.13 millert 191: * include the newline (or carriage return) at the end.
1.1 deraadt 192: */
193: int
1.20 millert 194: readline(FILE *ibuf, char *linebuf, int linesize, int *signo)
1.1 deraadt 195: {
1.19 millert 196: struct sigaction act;
197: struct sigaction savetstp;
198: struct sigaction savettou;
199: struct sigaction savettin;
200: struct sigaction saveint;
201: struct sigaction savehup;
202: sigset_t oset;
1.14 millert 203: int n;
1.1 deraadt 204:
1.19 millert 205: /*
206: * Setup signal handlers if the caller asked us to catch signals.
207: * Note that we do not restart system calls since we need the
1.28 krw 208: * read to be interruptible.
1.19 millert 209: */
210: if (signo) {
211: fiosignal = 0;
212: sigemptyset(&act.sa_mask);
213: act.sa_flags = 0;
214: act.sa_handler = fioint;
215: if (sigaction(SIGINT, NULL, &saveint) == 0 &&
216: saveint.sa_handler != SIG_IGN) {
217: (void)sigaction(SIGINT, &act, &saveint);
218: (void)sigprocmask(SIG_UNBLOCK, &intset, &oset);
219: }
220: if (sigaction(SIGHUP, NULL, &savehup) == 0 &&
221: savehup.sa_handler != SIG_IGN)
222: (void)sigaction(SIGHUP, &act, &savehup);
223: (void)sigaction(SIGTSTP, &act, &savetstp);
224: (void)sigaction(SIGTTOU, &act, &savettou);
225: (void)sigaction(SIGTTIN, &act, &savettin);
226: }
227:
1.1 deraadt 228: clearerr(ibuf);
1.19 millert 229: if (fgets(linebuf, linesize, ibuf) == NULL) {
230: if (ferror(ibuf))
231: clearerr(ibuf);
232: n = -1;
233: } else {
234: n = strlen(linebuf);
235: if (n > 0 && linebuf[n - 1] == '\n')
236: linebuf[--n] = '\0';
237: if (n > 0 && linebuf[n - 1] == '\r')
238: linebuf[--n] = '\0';
239: }
240:
241: if (signo) {
242: (void)sigprocmask(SIG_SETMASK, &oset, NULL);
243: (void)sigaction(SIGINT, &saveint, NULL);
244: (void)sigaction(SIGHUP, &savehup, NULL);
245: (void)sigaction(SIGTSTP, &savetstp, NULL);
246: (void)sigaction(SIGTTOU, &savettou, NULL);
247: (void)sigaction(SIGTTIN, &savettin, NULL);
248: *signo = fiosignal;
249: }
1.6 millert 250:
251: return(n);
1.1 deraadt 252: }
253:
254: /*
255: * Return a file buffer all ready to read up the
256: * passed message pointer.
257: */
258: FILE *
1.20 millert 259: setinput(struct message *mp)
1.1 deraadt 260: {
261:
262: fflush(otf);
1.29 tobias 263: if (fseek(itf, (long)positionof(mp->m_block, mp->m_offset), SEEK_SET)
264: < 0)
1.14 millert 265: err(1, "fseek");
1.6 millert 266: return(itf);
1.1 deraadt 267: }
268:
269: /*
270: * Take the data out of the passed ghost file and toss it into
271: * a dynamically allocated message structure.
272: */
273: void
1.20 millert 274: makemessage(FILE *f, int omsgCount)
1.1 deraadt 275: {
1.21 millert 276: size_t size;
277: struct message *nmessage;
1.1 deraadt 278:
1.21 millert 279: size = (msgCount + 1) * sizeof(struct message);
280: nmessage = (struct message *)realloc(message, size);
281: if (nmessage == 0)
1.22 mpech 282: errx(1, "Insufficient memory for %d messages",
1.21 millert 283: msgCount);
284: if (omsgCount == 0 || message == NULL)
285: dot = nmessage;
286: else
287: dot = nmessage + (dot - message);
288: message = nmessage;
1.6 millert 289: size -= (omsgCount + 1) * sizeof(struct message);
1.1 deraadt 290: fflush(f);
1.26 deraadt 291: (void)lseek(fileno(f), (off_t)sizeof(*message), SEEK_SET);
1.18 millert 292: if (myread(fileno(f), (void *) &message[omsgCount], size) != size)
1.14 millert 293: errx(1, "Message temporary file corrupted");
1.1 deraadt 294: message[msgCount].m_size = 0;
295: message[msgCount].m_lines = 0;
1.6 millert 296: (void)Fclose(f);
1.1 deraadt 297: }
298:
299: /*
300: * Append the passed message descriptor onto the temp file.
301: * If the write fails, return 1, else 0
302: */
303: int
1.20 millert 304: append(struct message *mp, FILE *f)
1.1 deraadt 305: {
1.20 millert 306:
1.6 millert 307: return(fwrite((char *) mp, sizeof(*mp), 1, f) != 1);
1.1 deraadt 308: }
309:
310: /*
1.16 millert 311: * Delete or truncate a file, but only if the file is a plain file.
1.1 deraadt 312: */
313: int
1.20 millert 314: rm(char *name)
1.1 deraadt 315: {
316: struct stat sb;
317:
318: if (stat(name, &sb) < 0)
319: return(-1);
320: if (!S_ISREG(sb.st_mode)) {
321: errno = EISDIR;
322: return(-1);
323: }
1.16 millert 324: if (unlink(name) == -1) {
325: if (errno == EPERM)
1.25 deraadt 326: return(truncate(name, (off_t)0));
1.16 millert 327: else
328: return(-1);
329: }
330: return(0);
1.1 deraadt 331: }
332:
333: static int sigdepth; /* depth of holdsigs() */
1.2 deraadt 334: static sigset_t nset, oset;
1.1 deraadt 335: /*
336: * Hold signals SIGHUP, SIGINT, and SIGQUIT.
337: */
338: void
1.20 millert 339: holdsigs(void)
1.1 deraadt 340: {
341:
1.2 deraadt 342: if (sigdepth++ == 0) {
343: sigemptyset(&nset);
344: sigaddset(&nset, SIGHUP);
345: sigaddset(&nset, SIGINT);
346: sigaddset(&nset, SIGQUIT);
347: sigprocmask(SIG_BLOCK, &nset, &oset);
348: }
1.1 deraadt 349: }
350:
351: /*
352: * Release signals SIGHUP, SIGINT, and SIGQUIT.
353: */
354: void
1.20 millert 355: relsesigs(void)
1.1 deraadt 356: {
357:
358: if (--sigdepth == 0)
1.2 deraadt 359: sigprocmask(SIG_SETMASK, &oset, NULL);
1.1 deraadt 360: }
361:
362: /*
1.19 millert 363: * Unblock and ignore a signal
364: */
365: int
1.20 millert 366: ignoresig(int sig, struct sigaction *oact, sigset_t *oset)
1.19 millert 367: {
368: struct sigaction act;
369: sigset_t nset;
370: int error;
371:
372: sigemptyset(&act.sa_mask);
373: act.sa_flags = SA_RESTART;
374: act.sa_handler = SIG_IGN;
375: error = sigaction(sig, &act, oact);
376:
377: if (error == 0) {
378: sigemptyset(&nset);
379: sigaddset(&nset, sig);
380: (void)sigprocmask(SIG_UNBLOCK, &nset, oset);
381: } else if (oset != NULL)
382: (void)sigprocmask(SIG_BLOCK, NULL, oset);
383:
384: return(error);
385: }
386:
387: /*
1.1 deraadt 388: * Determine the size of the file possessed by
389: * the passed buffer.
390: */
391: off_t
1.20 millert 392: fsize(FILE *iob)
1.1 deraadt 393: {
394: struct stat sbuf;
395:
396: if (fstat(fileno(iob), &sbuf) < 0)
1.6 millert 397: return(0);
398: return(sbuf.st_size);
1.1 deraadt 399: }
400:
401: /*
402: * Evaluate the string given as a new mailbox name.
403: * Supported meta characters:
404: * % for my system mail box
405: * %user for user's system mail box
406: * # for previous file
407: * & invoker's mbox file
408: * +file file in folder directory
409: * any shell meta character
410: * Return the file name as a dynamic string.
411: */
412: char *
1.20 millert 413: expand(char *name)
1.1 deraadt 414: {
415: char xname[PATHSIZE];
416: char cmdbuf[PATHSIZE]; /* also used for file names */
1.20 millert 417: pid_t pid;
418: int l;
1.14 millert 419: char *cp, *shell;
1.1 deraadt 420: int pivec[2];
421: struct stat sbuf;
1.12 millert 422: extern int wait_status;
1.1 deraadt 423:
424: /*
425: * The order of evaluation is "%" and "#" expand into constants.
426: * "&" can expand into "+". "+" can expand into shell meta characters.
427: * Shell meta characters expand into constants.
428: * This way, we make no recursive expansion.
429: */
430: switch (*name) {
431: case '%':
1.6 millert 432: findmail(name[1] ? name + 1 : myname, xname, sizeof(xname));
433: return(savestr(xname));
1.1 deraadt 434: case '#':
435: if (name[1] != 0)
436: break;
437: if (prevfile[0] == 0) {
1.6 millert 438: puts("No previous file");
1.8 millert 439: return(NULL);
1.1 deraadt 440: }
1.6 millert 441: return(savestr(prevfile));
1.1 deraadt 442: case '&':
1.8 millert 443: if (name[1] == 0 && (name = value("MBOX")) == NULL)
1.1 deraadt 444: name = "~/mbox";
445: /* fall through */
446: }
1.6 millert 447: if (name[0] == '+' && getfold(cmdbuf, sizeof(cmdbuf)) >= 0) {
1.10 millert 448: (void)snprintf(xname, sizeof(xname), "%s/%s", cmdbuf, name + 1);
1.1 deraadt 449: name = savestr(xname);
450: }
451: /* catch the most common shell meta character */
1.17 millert 452: if (name[0] == '~' && homedir && (name[1] == '/' || name[1] == '\0')) {
1.10 millert 453: (void)snprintf(xname, sizeof(xname), "%s%s", homedir, name + 1);
1.1 deraadt 454: name = savestr(xname);
455: }
1.20 millert 456: if (strpbrk(name, "~{[*?$`'\"\\") == NULL)
1.6 millert 457: return(name);
1.20 millert 458: /* XXX - just use glob(3) and env expansion instead? */
1.1 deraadt 459: if (pipe(pivec) < 0) {
1.6 millert 460: warn("pipe");
461: return(name);
1.1 deraadt 462: }
1.10 millert 463: (void)snprintf(cmdbuf, sizeof(cmdbuf), "echo %s", name);
1.18 millert 464: shell = value("SHELL");
1.8 millert 465: pid = start_command(shell, 0, -1, pivec[1], "-c", cmdbuf, NULL);
1.1 deraadt 466: if (pid < 0) {
1.6 millert 467: (void)close(pivec[0]);
468: (void)close(pivec[1]);
1.8 millert 469: return(NULL);
1.6 millert 470: }
471: (void)close(pivec[1]);
1.18 millert 472: l = myread(pivec[0], xname, PATHSIZE);
473: if (l < 0)
474: warn("read"); /* report error before errno changes */
1.6 millert 475: (void)close(pivec[0]);
1.12 millert 476: if (wait_child(pid) < 0 && WIFSIGNALED(wait_status) &&
477: WTERMSIG(wait_status) != SIGPIPE) {
1.1 deraadt 478: fprintf(stderr, "\"%s\": Expansion failed.\n", name);
1.8 millert 479: return(NULL);
1.1 deraadt 480: }
1.18 millert 481: if (l < 0)
1.8 millert 482: return(NULL);
1.1 deraadt 483: if (l == 0) {
484: fprintf(stderr, "\"%s\": No match.\n", name);
1.8 millert 485: return(NULL);
1.1 deraadt 486: }
1.6 millert 487: if (l == PATHSIZE) {
1.1 deraadt 488: fprintf(stderr, "\"%s\": Expansion buffer overflow.\n", name);
1.8 millert 489: return(NULL);
1.1 deraadt 490: }
1.6 millert 491: xname[l] = '\0';
1.1 deraadt 492: for (cp = &xname[l-1]; *cp == '\n' && cp > xname; cp--)
493: ;
494: cp[1] = '\0';
1.3 millert 495: if (strchr(xname, ' ') && stat(xname, &sbuf) < 0) {
1.1 deraadt 496: fprintf(stderr, "\"%s\": Ambiguous.\n", name);
1.8 millert 497: return(NULL);
1.1 deraadt 498: }
1.6 millert 499: return(savestr(xname));
1.1 deraadt 500: }
501:
502: /*
503: * Determine the current folder directory name.
504: */
505: int
1.20 millert 506: getfold(char *name, int namelen)
1.1 deraadt 507: {
508: char *folder;
509:
1.8 millert 510: if ((folder = value("folder")) == NULL)
1.6 millert 511: return(-1);
1.20 millert 512: if (*folder == '/')
513: strlcpy(name, folder, namelen);
514: else
1.17 millert 515: (void)snprintf(name, namelen, "%s/%s", homedir ? homedir : ".",
516: folder);
1.6 millert 517: return(0);
1.1 deraadt 518: }
519:
520: /*
521: * Return the name of the dead.letter file.
522: */
523: char *
1.20 millert 524: getdeadletter(void)
1.1 deraadt 525: {
1.14 millert 526: char *cp;
1.1 deraadt 527:
1.8 millert 528: if ((cp = value("DEAD")) == NULL || (cp = expand(cp)) == NULL)
1.1 deraadt 529: cp = expand("~/dead.letter");
530: else if (*cp != '/') {
531: char buf[PATHSIZE];
532:
1.7 millert 533: (void)snprintf(buf, sizeof(buf), "~/%s", cp);
1.1 deraadt 534: cp = expand(buf);
535: }
1.6 millert 536: return(cp);
1.19 millert 537: }
538:
539: /*
540: * Signal handler used by readline() to catch SIGINT, SIGHUP, SIGTSTP,
541: * SIGTTOU, SIGTTIN.
542: */
543: void
1.20 millert 544: fioint(int s)
1.19 millert 545: {
546:
547: fiosignal = s;
1.1 deraadt 548: }
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