1 /* $OpenBSD: fio.c,v 1.36 2015/10/16 18:21:43 mmcc Exp $ */ 2 /* $NetBSD: fio.c,v 1.8 1997/07/07 22:57:55 phil Exp $ */ 3 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. 16 * 3. Neither the name of the University nor the names of its contributors 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 <glob.h> 41 #include "extern.h" 42 43 /* 44 * Mail -- a mail program 45 * 46 * File I/O. 47 */ 48 49 static volatile sig_atomic_t fiosignal; 50 51 /* 52 * Wrapper for read() to catch EINTR. 53 */ 54 static ssize_t 55 myread(int fd, char *buf, int len) 56 { 57 ssize_t nread; 58 59 while ((nread = read(fd, buf, len)) == -1 && errno == EINTR) 60 ; 61 return(nread); 62 } 63 64 /* 65 * Set up the input pointers while copying the mail file into /tmp. 66 */ 67 void 68 setptr(FILE *ibuf, off_t offset) 69 { 70 int c, count; 71 char *cp, *cp2; 72 struct message this; 73 FILE *mestmp; 74 int maybe, inhead, omsgCount; 75 char linebuf[LINESIZE], pathbuf[PATHSIZE]; 76 77 /* Get temporary file. */ 78 (void)snprintf(pathbuf, sizeof(pathbuf), "%s/mail.XXXXXXXXXX", tmpdir); 79 if ((c = mkstemp(pathbuf)) == -1 || (mestmp = Fdopen(c, "r+")) == NULL) 80 err(1, "can't open %s", pathbuf); 81 (void)rm(pathbuf); 82 83 if (offset == 0) { 84 msgCount = 0; 85 } else { 86 /* Seek into the file to get to the new messages */ 87 (void)fseeko(ibuf, offset, SEEK_SET); 88 /* 89 * We need to make "offset" a pointer to the end of 90 * the temp file that has the copy of the mail file. 91 * If any messages have been edited, this will be 92 * different from the offset into the mail file. 93 */ 94 (void)fseeko(otf, (off_t)0, SEEK_END); 95 offset = ftell(otf); 96 } 97 omsgCount = msgCount; 98 maybe = 1; 99 inhead = 0; 100 this.m_flag = MUSED|MNEW; 101 this.m_size = 0; 102 this.m_lines = 0; 103 this.m_block = 0; 104 this.m_offset = 0; 105 for (;;) { 106 if (fgets(linebuf, sizeof(linebuf), ibuf) == NULL) { 107 if (append(&this, mestmp)) 108 err(1, "temporary file"); 109 makemessage(mestmp, omsgCount); 110 return; 111 } 112 count = strlen(linebuf); 113 /* 114 * Transforms lines ending in <CR><LF> to just <LF>. 115 * This allows mail to be able to read Eudora mailboxes 116 * that reside on a DOS partition. 117 */ 118 if (count >= 2 && linebuf[count-1] == '\n' && 119 linebuf[count - 2] == '\r') { 120 linebuf[count - 2] = '\n'; 121 linebuf[count - 1] = '\0'; 122 count--; 123 } 124 125 (void)fwrite(linebuf, sizeof(*linebuf), count, otf); 126 if (ferror(otf)) 127 err(1, "%s", pathbuf); 128 if (count && linebuf[count - 1] == '\n') 129 linebuf[count - 1] = '\0'; 130 if (maybe && linebuf[0] == 'F' && ishead(linebuf)) { 131 msgCount++; 132 if (append(&this, mestmp)) 133 err(1, "temporary file"); 134 this.m_flag = MUSED|MNEW; 135 this.m_size = 0; 136 this.m_lines = 0; 137 this.m_block = blockof(offset); 138 this.m_offset = offsetof(offset); 139 inhead = 1; 140 } else if (linebuf[0] == 0) { 141 inhead = 0; 142 } else if (inhead) { 143 for (cp = linebuf, cp2 = "status";; cp++) { 144 if ((c = (unsigned char)*cp2++) == 0) { 145 while (isspace((unsigned char)*cp++)) 146 ; 147 if (cp[-1] != ':') 148 break; 149 while ((c = (unsigned char)*cp++) != '\0') 150 if (c == 'R') 151 this.m_flag |= MREAD; 152 else if (c == 'O') 153 this.m_flag &= ~MNEW; 154 inhead = 0; 155 break; 156 } 157 if (*cp != c && *cp != toupper(c)) 158 break; 159 } 160 } 161 offset += count; 162 this.m_size += count; 163 this.m_lines++; 164 maybe = linebuf[0] == 0; 165 } 166 } 167 168 /* 169 * Drop the passed line onto the passed output buffer. 170 * If a write error occurs, return -1, else the count of 171 * characters written, including the newline if requested. 172 */ 173 int 174 putline(FILE *obuf, char *linebuf, int outlf) 175 { 176 int c; 177 178 c = strlen(linebuf); 179 (void)fwrite(linebuf, sizeof(*linebuf), c, obuf); 180 if (outlf) { 181 (void)putc('\n', obuf); 182 c++; 183 } 184 if (ferror(obuf)) 185 return(-1); 186 return(c); 187 } 188 189 /* 190 * Read up a line from the specified input into the line 191 * buffer. Return the number of characters read. Do not 192 * include the newline (or carriage return) at the end. 193 */ 194 int 195 readline(FILE *ibuf, char *linebuf, int linesize, int *signo) 196 { 197 struct sigaction act; 198 struct sigaction savetstp; 199 struct sigaction savettou; 200 struct sigaction savettin; 201 struct sigaction saveint; 202 struct sigaction savehup; 203 sigset_t oset; 204 int n; 205 206 /* 207 * Setup signal handlers if the caller asked us to catch signals. 208 * Note that we do not restart system calls since we need the 209 * read to be interruptible. 210 */ 211 if (signo) { 212 fiosignal = 0; 213 sigemptyset(&act.sa_mask); 214 act.sa_flags = 0; 215 act.sa_handler = fioint; 216 if (sigaction(SIGINT, NULL, &saveint) == 0 && 217 saveint.sa_handler != SIG_IGN) { 218 (void)sigaction(SIGINT, &act, &saveint); 219 (void)sigprocmask(SIG_UNBLOCK, &intset, &oset); 220 } 221 if (sigaction(SIGHUP, NULL, &savehup) == 0 && 222 savehup.sa_handler != SIG_IGN) 223 (void)sigaction(SIGHUP, &act, &savehup); 224 (void)sigaction(SIGTSTP, &act, &savetstp); 225 (void)sigaction(SIGTTOU, &act, &savettou); 226 (void)sigaction(SIGTTIN, &act, &savettin); 227 } 228 229 clearerr(ibuf); 230 if (fgets(linebuf, linesize, ibuf) == NULL) { 231 if (ferror(ibuf)) 232 clearerr(ibuf); 233 n = -1; 234 } else { 235 n = strlen(linebuf); 236 if (n > 0 && linebuf[n - 1] == '\n') 237 linebuf[--n] = '\0'; 238 if (n > 0 && linebuf[n - 1] == '\r') 239 linebuf[--n] = '\0'; 240 } 241 242 if (signo) { 243 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 244 (void)sigaction(SIGINT, &saveint, NULL); 245 (void)sigaction(SIGHUP, &savehup, NULL); 246 (void)sigaction(SIGTSTP, &savetstp, NULL); 247 (void)sigaction(SIGTTOU, &savettou, NULL); 248 (void)sigaction(SIGTTIN, &savettin, NULL); 249 *signo = fiosignal; 250 } 251 252 return(n); 253 } 254 255 /* 256 * Return a file buffer all ready to read up the 257 * passed message pointer. 258 */ 259 FILE * 260 setinput(struct message *mp) 261 { 262 263 fflush(otf); 264 if (fseek(itf, (long)positionof(mp->m_block, mp->m_offset), SEEK_SET) 265 < 0) 266 err(1, "fseek"); 267 return(itf); 268 } 269 270 /* 271 * Take the data out of the passed ghost file and toss it into 272 * a dynamically allocated message structure. 273 */ 274 void 275 makemessage(FILE *f, int omsgCount) 276 { 277 size_t size; 278 struct message *nmessage; 279 280 size = (msgCount + 1) * sizeof(struct message); 281 nmessage = realloc(message, size); 282 if (nmessage == 0) 283 err(1, "realloc"); 284 if (omsgCount == 0 || message == NULL) 285 dot = nmessage; 286 else 287 dot = nmessage + (dot - message); 288 message = nmessage; 289 size -= (omsgCount + 1) * sizeof(struct message); 290 fflush(f); 291 (void)lseek(fileno(f), (off_t)sizeof(*message), SEEK_SET); 292 if (myread(fileno(f), (void *) &message[omsgCount], size) != size) 293 errx(1, "Message temporary file corrupted"); 294 message[msgCount].m_size = 0; 295 message[msgCount].m_lines = 0; 296 (void)Fclose(f); 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 304 append(struct message *mp, FILE *f) 305 { 306 307 return(fwrite((char *) mp, sizeof(*mp), 1, f) != 1); 308 } 309 310 /* 311 * Delete or truncate a file, but only if the file is a plain file. 312 */ 313 int 314 rm(char *name) 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 } 324 if (unlink(name) == -1) { 325 if (errno == EPERM) 326 return(truncate(name, (off_t)0)); 327 else 328 return(-1); 329 } 330 return(0); 331 } 332 333 static int sigdepth; /* depth of holdsigs() */ 334 static sigset_t nset, oset; 335 /* 336 * Hold signals SIGHUP, SIGINT, and SIGQUIT. 337 */ 338 void 339 holdsigs(void) 340 { 341 342 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 } 349 } 350 351 /* 352 * Release signals SIGHUP, SIGINT, and SIGQUIT. 353 */ 354 void 355 relsesigs(void) 356 { 357 358 if (--sigdepth == 0) 359 sigprocmask(SIG_SETMASK, &oset, NULL); 360 } 361 362 /* 363 * Unblock and ignore a signal 364 */ 365 int 366 ignoresig(int sig, struct sigaction *oact, sigset_t *oset) 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 /* 388 * Determine the size of the file possessed by 389 * the passed buffer. 390 */ 391 off_t 392 fsize(FILE *iob) 393 { 394 struct stat sbuf; 395 396 if (fstat(fileno(iob), &sbuf) < 0) 397 return(0); 398 return(sbuf.st_size); 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 * 413 expand(char *name) 414 { 415 const int flags = GLOB_BRACE|GLOB_TILDE|GLOB_NOSORT; 416 char xname[PATHSIZE]; 417 char cmdbuf[PATHSIZE]; /* also used for file names */ 418 char *match = NULL; 419 glob_t names; 420 421 /* 422 * The order of evaluation is "%" and "#" expand into constants. 423 * "&" can expand into "+". "+" can expand into shell meta characters. 424 * Shell meta characters expand into constants. 425 * This way, we make no recursive expansion. 426 */ 427 switch (*name) { 428 case '%': 429 findmail(name[1] ? name + 1 : myname, xname, sizeof(xname)); 430 return(savestr(xname)); 431 case '#': 432 if (name[1] != 0) 433 break; 434 if (prevfile[0] == 0) { 435 puts("No previous file"); 436 return(NULL); 437 } 438 return(savestr(prevfile)); 439 case '&': 440 if (name[1] == 0 && (name = value("MBOX")) == NULL) 441 name = "~/mbox"; 442 /* fall through */ 443 } 444 if (name[0] == '+' && getfold(cmdbuf, sizeof(cmdbuf)) >= 0) { 445 (void)snprintf(xname, sizeof(xname), "%s/%s", cmdbuf, name + 1); 446 name = savestr(xname); 447 } 448 /* catch the most common shell meta character */ 449 if (name[0] == '~' && homedir && (name[1] == '/' || name[1] == '\0')) { 450 (void)snprintf(xname, sizeof(xname), "%s%s", homedir, name + 1); 451 name = savestr(xname); 452 } 453 if (strpbrk(name, "~{[*?\\") == NULL) 454 return(savestr(name)); 455 456 /* XXX - does not expand enviroment variables. */ 457 switch (glob(name, flags, NULL, &names)) { 458 case 0: 459 if (names.gl_pathc == 1) 460 match = savestr(names.gl_pathv[0]); 461 else 462 fprintf(stderr, "\"%s\": Ambiguous.\n", name); 463 break; 464 case GLOB_NOSPACE: 465 fprintf(stderr, "\"%s\": Out of memory.\n", name); 466 break; 467 case GLOB_NOMATCH: 468 fprintf(stderr, "\"%s\": No match.\n", name); 469 break; 470 default: 471 fprintf(stderr, "\"%s\": Expansion failed.\n", name); 472 break; 473 } 474 globfree(&names); 475 return(match); 476 } 477 478 /* 479 * Determine the current folder directory name. 480 */ 481 int 482 getfold(char *name, int namelen) 483 { 484 char *folder; 485 486 if ((folder = value("folder")) == NULL) 487 return(-1); 488 if (*folder == '/') 489 strlcpy(name, folder, namelen); 490 else 491 (void)snprintf(name, namelen, "%s/%s", homedir ? homedir : ".", 492 folder); 493 return(0); 494 } 495 496 /* 497 * Return the name of the dead.letter file. 498 */ 499 char * 500 getdeadletter(void) 501 { 502 char *cp; 503 504 if ((cp = value("DEAD")) == NULL || (cp = expand(cp)) == NULL) 505 cp = expand("~/dead.letter"); 506 else if (*cp != '/') { 507 char buf[PATHSIZE]; 508 509 (void)snprintf(buf, sizeof(buf), "~/%s", cp); 510 cp = expand(buf); 511 } 512 return(cp); 513 } 514 515 /* 516 * Signal handler used by readline() to catch SIGINT, SIGHUP, SIGTSTP, 517 * SIGTTOU, SIGTTIN. 518 */ 519 void 520 fioint(int s) 521 { 522 523 fiosignal = s; 524 } 525