temp.c

   1 /*
   2  * S-nail - a mail user agent derived from Berkeley Mail.
   3  *
   4  * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
   5  * Copyright (c) 2012 Steffen "Daode" Nurpmeso.
   6  */
   7 /*
   8  * Copyright (c) 1980, 1993
   9  *      The Regents of the University of California.  All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  */
  39
  40 #include "rcv.h"
  41 #include "extern.h"
  42 #include <errno.h>
  43 #include <sys/stat.h>
  44 #include <fcntl.h>
  45
  46 /*
  47  * Mail -- a mail program
  48  *
  49  * Temporary file handling.
  50  */
  51
  52 static char     *tmpdir;
  53
  54 /*
  55  * Create a temporary file in tmpdir, use prefix for its name,
  56  * store the unique name in fn, and return a stdio FILE pointer
  57  * with access mode.
  58  * The permissions for the newly created file are given in bits.
  59  */
  60 FILE *
  61 Ftemp(char **fn, char *prefix, char *mode, int bits, int register_file)
  62 {
  63         FILE *fp;
  64         int fd;
  65
  66         *fn = smalloc(strlen(tmpdir) + strlen(prefix) + 8);
  67         strcpy(*fn, tmpdir);
  68         strcat(*fn, "/");
  69         strcat(*fn, prefix);
  70         strcat(*fn, "XXXXXX");
  71 #ifdef  HAVE_MKSTEMP
  72         if ((fd = mkstemp(*fn)) < 0)
  73                 goto Ftemperr;
  74         if (fchmod(fd, bits) < 0)
  75                 goto Ftemperr;
  76 #else   /* !HAVE_MKSTEMP */
  77         if (mktemp(*fn) == NULL)
  78                 goto Ftemperr;
  79         if ((fd = open(*fn, O_CREAT|O_EXCL|O_RDWR, bits)) < 0)
  80                 goto Ftemperr;
  81 #endif  /* !HAVE_MKSTEMP */
  82         if (register_file)
  83                 fp = Fdopen(fd, mode);
  84         else {
  85                 fp = fdopen(fd, mode);
  86                 fcntl(fd, F_SETFD, FD_CLOEXEC);
  87         }
  88         return fp;
  89 Ftemperr:
  90         Ftfree(fn);
  91         return NULL;
  92 }
  93
  94 /*
  95  * Free the resources associated with the given filename. To be
  96  * called after unlink().
  97  * Since this function can be called after receiving a signal,
  98  * the variable must be made NULL first and then free()d, to avoid
  99  * more than one free() call in all circumstances.
 100  */
 101 void
 102 Ftfree(char **fn)
 103 {
 104         char *cp = *fn;
 105
 106         *fn = NULL;
 107         free(cp);
 108 }
 109
 110 void
 111 tinit(void)
 112 {
 113         char *cp;
 114
 115         if ((cp = getenv("TMPDIR")) != NULL) {
 116                 tmpdir = smalloc(strlen(cp) + 1);
 117                 strcpy(tmpdir, cp);
 118         } else {
 119                 tmpdir = "/tmp";
 120         }
 121         if (myname != NULL) {
 122                 if (getuserid(myname) < 0) {
 123                         printf(catgets(catd, CATSET, 198,
 124                                 "\"%s\" is not a user of this system\n"),
 125                             myname);
 126                         exit(1);
 127                 }
 128         } else {
 129                 if ((cp = username()) == NULL) {
 130                         myname = "nobody";
 131                         if (rcvmode)
 132                                 exit(1);
 133                 } else {
 134                         myname = smalloc(strlen(cp) + 1);
 135                         strcpy(myname, cp);
 136                 }
 137         }
 138         if ((cp = getenv("HOME")) == NULL)
 139                 cp = ".";
 140         homedir = smalloc(strlen(cp) + 1);
 141         strcpy(homedir, cp);
 142         if (debug || value("debug"))
 143                 printf(catgets(catd, CATSET, 199,
 144                         "user = %s, homedir = %s\n"), myname, homedir);
 145 }