path: root/e-util/e-mktemp.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Jeffrey Stedfast <fejj@ximian.com>
 *
 *  Copyright 2001 Ximian, Inc. (www.ximian.com)
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
 *
 */


#include "e-mktemp.h"

#include <config.h>

#include <glib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>

#ifdef ENABLE_THREADS
#include <pthread.h>
#endif


static gboolean initialized = FALSE;
static GSList *temp_files = NULL;
static GSList *temp_dirs = NULL;
#ifdef ENABLE_THREADS
static pthread_mutex_t temp_files_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t temp_dirs_lock = PTHREAD_MUTEX_INITIALIZER;
#define TEMP_FILES_LOCK() pthread_mutex_lock (&temp_files_lock)
#define TEMP_FILES_UNLOCK() pthread_mutex_unlock (&temp_files_lock)
#define TEMP_DIRS_LOCK() pthread_mutex_lock (&temp_dirs_lock)
#define TEMP_DIRS_UNLOCK() pthread_mutex_unlock (&temp_dirs_lock)
#else
#define TEMP_FILES_LOCK()
#define TEMP_FILES_UNLOCK()
#define TEMP_DIRS_LOCK()
#define TEMP_DIRS_UNLOCK()
#endif /* ENABLE_THREADS */


static GString *
get_path (gboolean make)
{
    GString *path;
    
    path = g_string_new ("/tmp/evolution-");
    g_string_sprintfa (path, "%d-%d", (int) getuid (), (int) getpid ());
    
    if (make) {
        int ret;
        
        /* shoot now, ask questions later */
        ret = mkdir (path->str, S_IRWXU);
        if (ret == -1) {
            if (errno == EEXIST) {
                struct stat st;
                
                if (stat (path->str, &st) == -1) {
                    /* reset errno */
                    errno = EEXIST;
                    g_string_free (path, TRUE);
                    return NULL;
                }
                
                /* make sure this is a directory and belongs to us... */
                if (!S_ISDIR (st.st_dev) || st.st_uid != getuid ()) {
                    /* eek! this is bad... */
                    g_string_free (path, TRUE);
                    return NULL;
                }
            } else {
                /* some other error...do not pass go, do not collect $200 */
                g_string_free (path, TRUE);
                return NULL;
            }
        }
    }
    
    return path;
}

static void
e_mktemp_cleanup (void)
{
    GString *path;
    GSList *node;
    
    TEMP_FILES_LOCK ();
    if (temp_files) {
        node = temp_files;
        while (node) {
            unlink (node->data);
            g_free (node->data);
            node = node->next;
        }
        g_slist_free (temp_files);
        temp_files = NULL;
    }
    TEMP_FILES_UNLOCK ();
    
    TEMP_DIRS_LOCK ();
    if (temp_dirs) {
        node = temp_dirs;
        while (node) {
            /* perform the equivalent of a rm -rf */
            struct dirent *dent;
            DIR *dir;
            
            /* first empty out this directory of it's files... */
            dir = opendir (node->data);
            while ((dent = readdir (dir)) != NULL) {
                /* yea...so if we contain
                                   subdirectories this won't work, but
                                   it shouldn't so we won't
                                   bother caring... */
                if (strcmp (dent->d_name, ".") && strcmp (dent->d_name, ".."))
                    unlink (dent->d_name);
            }
            closedir (dir);
            
            /* ...then rmdir the directory */
            rmdir (node->data);
            g_free (node->data);
            node = node->next;
        }
        g_slist_free (temp_dirs);
        temp_dirs = NULL;
    }
    TEMP_DIRS_UNLOCK ();
    
    path = get_path (FALSE);
    rmdir (path->str);
    
    g_string_free (path, TRUE);
}


const char *
e_mktemp (const char *template)
{
    GString *path;
    char *ret;
    
    path = get_path (TRUE);
    if (!path)
        return NULL;
    
    g_string_append_c (path, '/');
    if (template)
        g_string_append (path, template);
    else
        g_string_append (path, "unknown-XXXXXX");
    
    ret = mktemp (path->str);
    if (ret) {
        TEMP_FILES_LOCK ();
        if (!initialized) {
            g_atexit (e_mktemp_cleanup);
            initialized = TRUE;
        }
        temp_files = g_slist_prepend (temp_files, ret);
        g_string_free (path, FALSE);
        TEMP_FILES_UNLOCK ();
    } else {
        g_string_free (path, TRUE);
    }
    
    return ret;
}


int
e_mkstemp (const char *template)
{
    GString *path;
    int fd;
    
    path = get_path (TRUE);
    if (!path)
        return -1;
    
    g_string_append_c (path, '/');
    if (template)
        g_string_append (path, template);
    else
        g_string_append (path, "unknown-XXXXXX");
    
    fd = mkstemp (path->str);
    if (fd != -1) {
        TEMP_FILES_LOCK ();
        if (!initialized) {
            g_atexit (e_mktemp_cleanup);
            initialized = TRUE;
        }
        temp_files = g_slist_prepend (temp_files, path->str);
        g_string_free (path, FALSE);
        TEMP_FILES_UNLOCK ();
    } else {
        g_string_free (path, TRUE);
    }
    
    return fd;
}


const char *
e_mkdtemp (const char *template)
{
    GString *path;
    char *tmpdir;
    
    path = get_path (TRUE);
    if (!path)
        return NULL;
    
    g_string_append_c (path, '/');
    if (template)
        g_string_append (path, template);
    else
        g_string_append (path, "unknown-XXXXXX");
    
#ifdef HAVE_MKDTEMP
    tmpdir = mkdtemp (path->str);
#else
    tmpdir = mktemp (path->str);
    if (tmpdir) {
        if (mkdir (tmpdir, S_IRWXU) == -1)
            tmpdir = NULL;
    }
#endif
    
    if (tmpdir) {
        TEMP_DIRS_LOCK ();
        if (!initialized) {
            g_atexit (e_mktemp_cleanup);
            initialized = TRUE;
        }
        temp_dirs = g_slist_prepend (temp_dirs, tmpdir);
        g_string_free (path, FALSE);
        TEMP_DIRS_UNLOCK ();
    } else {
        g_string_free (path, TRUE);
    }
    
    return tmpdir;
}