usr.bin/mail/fio.c

   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  * @(#)fio.c    8.2 (Berkeley) 4/20/95
  34  * $FreeBSD: src/usr.bin/mail/fio.c,v 1.2.6.4 2003/01/06 05:46:03 mikeh Exp $
  35  * $DragonFly: src/usr.bin/mail/fio.c,v 1.4 2004/09/08 03:01:11 joerg Exp $
  36  */
  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 extern int wait_status;
  54
  55 /*
  56  * Set up the input pointers while copying the mail file into /tmp.
  57  */
  58 void
  59 setptr(FILE *ibuf, off_t offset)
  60 {
  61         int c, count;
  62         char *cp, *cp2;
  63         struct message this;
  64         FILE *mestmp;
  65         int maybe, inhead;
  66         char linebuf[LINESIZE], pathbuf[PATHSIZE];
  67         int omsgCount;
  68
  69         /* Get temporary file. */
  70         snprintf(pathbuf, sizeof(pathbuf), "%s/mail.XXXXXXXXXX", tmpdir);
  71         if ((c = mkstemp(pathbuf)) == -1 || (mestmp = Fdopen(c, "r+")) == NULL)
  72                 err(1, "can't open %s", pathbuf);
  73         rm(pathbuf);
  74
  75         if (offset == 0) {
  76                  msgCount = 0;
  77         } else {
  78                 /* Seek into the file to get to the new messages */
  79                 fseeko(ibuf, offset, SEEK_SET);
  80                 /*
  81                  * We need to make "offset" a pointer to the end of
  82                  * the temp file that has the copy of the mail file.
  83                  * If any messages have been edited, this will be
  84                  * different from the offset into the mail file.
  85                  */
  86                 fseeko(otf, (off_t)0, SEEK_END);
  87                 offset = ftello(otf);
  88         }
  89         omsgCount = msgCount;
  90         maybe = 1;
  91         inhead = 0;
  92         this.m_flag = MUSED|MNEW;
  93         this.m_size = 0;
  94         this.m_lines = 0;
  95         this.m_block = 0;
  96         this.m_offset = 0;
  97         for (;;) {
  98                 if (fgets(linebuf, sizeof(linebuf), ibuf) == NULL) {
  99                         if (append(&this, mestmp))
 100                                 errx(1, "temporary file");
 101                         makemessage(mestmp, omsgCount);
 102                         return;
 103                 }
 104                 count = strlen(linebuf);
 105                 /*
 106                  * Transforms lines ending in <CR><LF> to just <LF>.
 107                  * This allows mail to be able to read Eudora mailboxes.
 108                  */
 109                 if (count >= 2 && linebuf[count - 1] == '\n' &&
 110                     linebuf[count - 2] == '\r') {
 111                         count--;
 112                         linebuf[count - 1] = '\n';
 113                 }
 114
 115                 fwrite(linebuf, sizeof(*linebuf), count, otf);
 116                 if (ferror(otf))
 117                         errx(1, "/tmp");
 118                 if (count)
 119                         linebuf[count - 1] = '\0';
 120                 if (maybe && linebuf[0] == 'F' && ishead(linebuf)) {
 121                         msgCount++;
 122                         if (append(&this, mestmp))
 123                                 errx(1, "temporary file");
 124                         this.m_flag = MUSED|MNEW;
 125                         this.m_size = 0;
 126                         this.m_lines = 0;
 127                         this.m_block = blockof(offset);
 128                         this.m_offset = boffsetof(offset);
 129                         inhead = 1;
 130                 } else if (linebuf[0] == 0) {
 131                         inhead = 0;
 132                 } else if (inhead) {
 133                         for (cp = linebuf, cp2 = "status";; cp++) {
 134                                 if ((c = *cp2++) == '\0') {
 135                                         while (isspace((unsigned char)*cp++))
 136                                                 ;
 137                                         if (cp[-1] != ':')
 138                                                 break;
 139                                         while ((c = *cp++) != '\0')
 140                                                 if (c == 'R')
 141                                                         this.m_flag |= MREAD;
 142                                                 else if (c == 'O')
 143                                                         this.m_flag &= ~MNEW;
 144                                         inhead = 0;
 145                                         break;
 146                                 }
 147                                 if (*cp != c && *cp != toupper((unsigned char)c))
 148                                         break;
 149                         }
 150                 }
 151                 offset += count;
 152                 this.m_size += count;
 153                 this.m_lines++;
 154                 maybe = linebuf[0] == 0;
 155         }
 156 }
 157
 158 /*
 159  * Drop the passed line onto the passed output buffer.
 160  * If a write error occurs, return -1, else the count of
 161  * characters written, including the newline if requested.
 162  */
 163 int
 164 putline(FILE *obuf, char *linebuf, int outlf)
 165 {
 166         int c;
 167
 168         c = strlen(linebuf);
 169         fwrite(linebuf, sizeof(*linebuf), c, obuf);
 170         if (outlf) {
 171                 fprintf(obuf, "\n");
 172                 c++;
 173         }
 174         if (ferror(obuf))
 175                 return (-1);
 176         return (c);
 177 }
 178
 179 /*
 180  * Read up a line from the specified input into the line
 181  * buffer.  Return the number of characters read.  Do not
 182  * include the newline (or carriage return) at the end.
 183  */
 184 int
 185 readline(FILE *ibuf, char *linebuf, int linesize)
 186 {
 187         int n;
 188
 189         clearerr(ibuf);
 190         if (fgets(linebuf, linesize, ibuf) == NULL)
 191                 return (-1);
 192         n = strlen(linebuf);
 193         if (n > 0 && linebuf[n - 1] == '\n')
 194                 linebuf[--n] = '\0';
 195         if (n > 0 && linebuf[n - 1] == '\r')
 196                 linebuf[--n] = '\0';
 197         return (n);
 198 }
 199
 200 /*
 201  * Return a file buffer all ready to read up the
 202  * passed message pointer.
 203  */
 204 FILE *
 205 setinput(struct message *mp)
 206 {
 207         fflush(otf);
 208         if (fseeko(itf,
 209                    positionof(mp->m_block, mp->m_offset), SEEK_SET) < 0)
 210                 err(1, "fseeko");
 211         return (itf);
 212 }
 213
 214 /*
 215  * Take the data out of the passed ghost file and toss it into
 216  * a dynamically allocated message structure.
 217  */
 218 void
 219 makemessage(FILE *f, int omsgCount)
 220 {
 221         size_t size;
 222         struct message *nmessage;
 223
 224         size = (msgCount + 1) * sizeof(struct message);
 225         nmessage = (struct message *)realloc(message, size);
 226         if (nmessage == NULL)
 227                 errx(1, "Insufficient memory for %d messages\n",
 228                     msgCount);
 229         if (omsgCount == 0 || message == NULL)
 230                 dot = nmessage;
 231         else
 232                 dot = nmessage + (dot - message);
 233         message = nmessage;
 234         size -= (omsgCount + 1) * sizeof(struct message);
 235         fflush(f);
 236         lseek(fileno(f), (off_t)sizeof(*message), 0);
 237         if (read(fileno(f), (char *)&message[omsgCount], size) != size)
 238                 errx(1, "Message temporary file corrupted");
 239         message[msgCount].m_size = 0;
 240         message[msgCount].m_lines = 0;
 241         Fclose(f);
 242 }
 243
 244 /*
 245  * Append the passed message descriptor onto the temp file.
 246  * If the write fails, return 1, else 0
 247  */
 248 int
 249 append(struct message *mp, FILE *f)
 250 {
 251         return (fwrite((char *)mp, sizeof(*mp), 1, f) != 1);
 252 }
 253
 254 /*
 255  * Delete a file, but only if the file is a plain file.
 256  */
 257 int
 258 rm(char *name)
 259 {
 260         struct stat sb;
 261
 262         if (stat(name, &sb) < 0)
 263                 return (-1);
 264         if (!S_ISREG(sb.st_mode)) {
 265                 errno = EISDIR;
 266                 return (-1);
 267         }
 268         return (unlink(name));
 269 }
 270
 271 static int sigdepth;            /* depth of holdsigs() */
 272 static sigset_t nset, oset;
 273 /*
 274  * Hold signals SIGHUP, SIGINT, and SIGQUIT.
 275  */
 276 void
 277 holdsigs(void)
 278 {
 279         if (sigdepth++ == 0) {
 280                 sigemptyset(&nset);
 281                 sigaddset(&nset, SIGHUP);
 282                 sigaddset(&nset, SIGINT);
 283                 sigaddset(&nset, SIGQUIT);
 284                 sigprocmask(SIG_BLOCK, &nset, &oset);
 285         }
 286 }
 287
 288 /*
 289  * Release signals SIGHUP, SIGINT, and SIGQUIT.
 290  */
 291 void
 292 relsesigs(void)
 293 {
 294         if (--sigdepth == 0)
 295                 sigprocmask(SIG_SETMASK, &oset, NULL);
 296 }
 297
 298 /*
 299  * Determine the size of the file possessed by
 300  * the passed buffer.
 301  */
 302 off_t
 303 fsize(FILE *iob)
 304 {
 305         struct stat sbuf;
 306
 307         if (fstat(fileno(iob), &sbuf) < 0)
 308                 return (0);
 309         return (sbuf.st_size);
 310 }
 311
 312 /*
 313  * Evaluate the string given as a new mailbox name.
 314  * Supported meta characters:
 315  *      %       for my system mail box
 316  *      %user   for user's system mail box
 317  *      #       for previous file
 318  *      &       invoker's mbox file
 319  *      +file   file in folder directory
 320  *      any shell meta character
 321  * Return the file name as a dynamic string.
 322  */
 323 char *
 324 expand(char *name)
 325 {
 326         char xname[PATHSIZE];
 327         char cmdbuf[PATHSIZE];          /* also used for file names */
 328         int pid, l;
 329         char *cp, *sh;
 330         int pivec[2];
 331         struct stat sbuf;
 332
 333         /*
 334          * The order of evaluation is "%" and "#" expand into constants.
 335          * "&" can expand into "+".  "+" can expand into shell meta characters.
 336          * Shell meta characters expand into constants.
 337          * This way, we make no recursive expansion.
 338          */
 339         switch (*name) {
 340         case '%':
 341                 findmail(name[1] ? name + 1 : myname, xname, sizeof(xname));
 342                 return (savestr(xname));
 343         case '#':
 344                 if (name[1] != 0)
 345                         break;
 346                 if (prevfile[0] == 0) {
 347                         printf("No previous file\n");
 348                         return (NULL);
 349                 }
 350                 return (savestr(prevfile));
 351         case '&':
 352                 if (name[1] == 0 && (name = value("MBOX")) == NULL)
 353                         name = "~/mbox";
 354                 /* fall through */
 355         }
 356         if (name[0] == '+' && getfold(cmdbuf, sizeof(cmdbuf)) >= 0) {
 357                 snprintf(xname, sizeof(xname), "%s/%s", cmdbuf, name + 1);
 358                 name = savestr(xname);
 359         }
 360         /* catch the most common shell meta character */
 361         if (name[0] == '~' && homedir != NULL &&
 362             (name[1] == '/' || name[1] == '\0')) {
 363                 snprintf(xname, sizeof(xname), "%s%s", homedir, name + 1);
 364                 name = savestr(xname);
 365         }
 366         if (!strpbrk(name, "~{[*?$`'\"\\"))
 367                 return (name);
 368         if (pipe(pivec) < 0) {
 369                 warn("pipe");
 370                 return (name);
 371         }
 372         snprintf(cmdbuf, sizeof(cmdbuf), "echo %s", name);
 373         if ((sh = value("SHELL")) == NULL)
 374                 sh = _PATH_CSHELL;
 375         pid = start_command(sh, 0, -1, pivec[1], "-c", cmdbuf, NULL);
 376         if (pid < 0) {
 377                 close(pivec[0]);
 378                 close(pivec[1]);
 379                 return (NULL);
 380         }
 381         close(pivec[1]);
 382         l = read(pivec[0], xname, BUFSIZ);
 383         close(pivec[0]);
 384         if (wait_child(pid) < 0 && WIFSIGNALED(wait_status) &&
 385             WTERMSIG(wait_status) != SIGPIPE) {
 386                 fprintf(stderr, "\"%s\": Expansion failed.\n", name);
 387                 return (NULL);
 388         }
 389         if (l < 0) {
 390                 warn("read");
 391                 return (NULL);
 392         }
 393         if (l == 0) {
 394                 fprintf(stderr, "\"%s\": No match.\n", name);
 395                 return (NULL);
 396         }
 397         if (l == BUFSIZ) {
 398                 fprintf(stderr, "\"%s\": Expansion buffer overflow.\n", name);
 399                 return (NULL);
 400         }
 401         xname[l] = '\0';
 402         for (cp = &xname[l-1]; *cp == '\n' && cp > xname; cp--)
 403                 ;
 404         cp[1] = '\0';
 405         if (strchr(xname, ' ') && stat(xname, &sbuf) < 0) {
 406                 fprintf(stderr, "\"%s\": Ambiguous.\n", name);
 407                 return (NULL);
 408         }
 409         return (savestr(xname));
 410 }
 411
 412 /*
 413  * Determine the current folder directory name.
 414  */
 415 int
 416 getfold(char *name, int namelen)
 417 {
 418         char *folder;
 419         int copylen;
 420
 421         if ((folder = value("folder")) == NULL)
 422                 return (-1);
 423         if (*folder == '/')
 424                 copylen = strlcpy(name, folder, namelen);
 425         else
 426                 copylen = snprintf(name, namelen, "%s/%s",
 427                     homedir ? homedir : ".", folder);
 428         return (copylen < 0 || copylen >= namelen ? (-1) : (0));
 429 }
 430
 431 /*
 432  * Return the name of the dead.letter file.
 433  */
 434 char *
 435 getdeadletter(void)
 436 {
 437         char *cp;
 438
 439         if ((cp = value("DEAD")) == NULL || (cp = expand(cp)) == NULL)
 440                 cp = expand("~/dead.letter");
 441         else if (*cp != '/') {
 442                 char buf[PATHSIZE];
 443
 444                 snprintf(buf, sizeof(buf), "~/%s", cp);
 445                 cp = expand(buf);
 446         }
 447         return (cp);
 448 }