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/*****************************************************************************/
/* cache.c - contains the cache routines */
/* Copyright (C) 1998-2007 Brian Masney <masneyb@gftp.org> */
/* */
/* 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 Place - Suite 330, Boston, MA 02111 USA */
/*****************************************************************************/
#include "gftp.h"
static const char cvsid[] = "$Id: cache.c 893 2007-03-13 01:52:50Z masneyb $";
struct gftp_cache_entry_tag
{
char *url,
*file;
int server_type;
time_t expiration_date;
char *pos1,
*pos2,
*pos3;
};
typedef struct gftp_cache_entry_tag gftp_cache_entry;
static int
gftp_parse_cache_line (gftp_request * request, /*@out@*/ gftp_cache_entry * centry,
char *line)
{
char *pos;
memset (centry, 0, sizeof (*centry));
if ((pos = strchr (line, '\t')) == NULL || *(pos + 1) == '\0')
{
if (request != NULL)
request->logging_function (gftp_logging_error, request,
_("Error: Invalid line %s in cache index file\n"),
line);
return (-1);
}
centry->pos1 = pos;
*pos++ = '\0';
centry->url = line;
centry->file = pos;
if ((pos = strchr (pos, '\t')) == NULL || *(pos + 1) == '\0')
{
if (request != NULL)
request->logging_function (gftp_logging_error, request,
_("Error: Invalid line %s in cache index file\n"),
line);
return (-1);
}
centry->pos2 = pos;
*pos++ = '\0';
centry->server_type = strtol (pos, NULL, 10);
if ((pos = strchr (pos, '\t')) == NULL || *(pos + 1) == '\0')
{
if (request != NULL)
request->logging_function (gftp_logging_error, request,
_("Error: Invalid line %s in cache index file\n"),
line);
return (-1);
}
centry->pos3 = pos;
*pos++ = '\0';
centry->expiration_date = strtol (pos, NULL, 10);
return (0);
}
static void
gftp_restore_cache_line (gftp_cache_entry * centry)
{
if (centry->pos1 != NULL)
*centry->pos1 = '\t';
if (centry->pos2 != NULL)
*centry->pos2 = '\t';
if (centry->pos3 != NULL)
*centry->pos3 = '\t';
}
void
gftp_generate_cache_description (gftp_request * request,
char *description,
size_t len, int ignore_directory)
{
g_snprintf (description, len, "%s://%s@%s:%d%s",
request->url_prefix,
request->username == NULL ? "" : request->username,
request->hostname == NULL ? "" : request->hostname,
request->port,
ignore_directory || request->directory == NULL ? "" : request->directory);
}
int
gftp_new_cache_entry (gftp_request * request)
{
char *cachedir, *tempstr, *temp1str;
int cache_fd, fd;
intptr_t cache_ttl;
ssize_t ret;
time_t t;
gftp_lookup_request_option (request, "cache_ttl", &cache_ttl);
time (&t);
t += cache_ttl;
cachedir = gftp_expand_path (NULL, BASE_CONF_DIR "/cache");
if (access (cachedir, F_OK) == -1)
{
if (mkdir (cachedir, S_IRUSR | S_IWUSR | S_IXUSR) < 0)
{
if (request != NULL)
request->logging_function (gftp_logging_error, request,
_("Error: Could not make directory %s: %s\n"),
cachedir, g_strerror (errno));
g_free (cachedir);
return (-1);
}
}
tempstr = g_strdup_printf ("%s/index.db", cachedir);
if ((fd = gftp_fd_open (request, tempstr, O_WRONLY | O_APPEND | O_CREAT,
S_IRUSR | S_IWUSR)) == -1)
{
g_free (tempstr);
g_free (cachedir);
return (-1);
}
g_free (tempstr);
tempstr = g_strdup_printf ("%s/cache.XXXXXX", cachedir);
if ((cache_fd = mkstemp (tempstr)) < 0)
{
g_free (tempstr);
g_free (cachedir);
if (request != NULL)
request->logging_function (gftp_logging_error, request,
_("Error: Cannot create temporary file: %s\n"),
g_strerror (errno));
return (-1);
}
g_free (cachedir);
lseek (fd, 0, SEEK_END);
temp1str = g_strdup_printf ("%s://%s@%s:%d%s\t%s\t%d\t%ld\n",
request->url_prefix,
request->username == NULL ? "" : request->username,
request->hostname == NULL ? "" : request->hostname,
request->port,
request->directory == NULL ? "" : request->directory,
tempstr, request->server_type, t);
g_free (tempstr);
ret = gftp_fd_write (NULL, temp1str, strlen (temp1str), fd);
g_free (temp1str);
if (close (fd) != 0 || ret < 0)
{
if (request != NULL)
request->logging_function (gftp_logging_error, request,
_("Error closing file descriptor: %s\n"),
g_strerror (errno));
close (cache_fd);
return (-1);
}
return (cache_fd);
}
int
gftp_find_cache_entry (gftp_request * request)
{
char *indexfile, buf[BUFSIZ], description[BUFSIZ];
gftp_getline_buffer * rbuf;
gftp_cache_entry centry;
int indexfd, cachefd;
time_t now;
time (&now);
*description = '\0';
gftp_generate_cache_description (request, description, sizeof (description),
0);
indexfile = gftp_expand_path (NULL, BASE_CONF_DIR "/cache/index.db");
if ((indexfd = gftp_fd_open (NULL, indexfile, O_RDONLY, 0)) == -1)
{
g_free (indexfile);
return (-1);
}
g_free (indexfile);
rbuf = NULL;
while (gftp_get_line (NULL, &rbuf, buf, sizeof (buf), indexfd) > 0)
{
if (gftp_parse_cache_line (request, ¢ry, buf) < 0)
continue;
/* See if this entry is still valid... */
if (centry.expiration_date < now)
continue;
if (strcmp (description, centry.url) == 0)
{
if (close (indexfd) != 0)
{
if (request != NULL)
request->logging_function (gftp_logging_error, request,
_("Error closing file descriptor: %s\n"),
g_strerror (errno));
return (-1);
}
if ((cachefd = gftp_fd_open (request, centry.file, O_RDONLY, 0)) == -1)
return (-1);
if (lseek (cachefd, 0, SEEK_END) == 0)
{
close (cachefd);
return (-1);
}
if (lseek (cachefd, 0, SEEK_SET) == -1)
{
if (request != NULL)
request->logging_function (gftp_logging_error, request,
_("Error: Cannot seek on file %s: %s\n"),
centry.file, g_strerror (errno));
}
request->server_type = centry.server_type;
return (cachefd);
}
}
close (indexfd);
return (-1);
}
void
gftp_clear_cache_files (void)
{
char *indexfile, buf[BUFSIZ];
gftp_getline_buffer * rbuf;
gftp_cache_entry centry;
int indexfd;
indexfile = gftp_expand_path (NULL, BASE_CONF_DIR "/cache/index.db");
if ((indexfd = gftp_fd_open (NULL, indexfile, O_RDONLY, 0)) == -1)
{
g_free (indexfile);
return;
}
*buf = '\0';
rbuf = NULL;
while (gftp_get_line (NULL, &rbuf, buf, sizeof (buf), indexfd) > 0)
{
if (gftp_parse_cache_line (NULL, ¢ry, buf) < 0)
continue;
unlink (centry.file);
}
close (indexfd);
unlink (indexfile);
g_free (indexfile);
}
void
gftp_delete_cache_entry (gftp_request * request, char *descr,
int ignore_directory)
{
char *oldindexfile, *newindexfile, buf[BUFSIZ], description[BUFSIZ];
int indexfd, newfd, del_entry;
gftp_getline_buffer * rbuf;
gftp_cache_entry centry;
size_t len;
time_t now;
g_return_if_fail (request != NULL || descr != NULL);
time (&now);
if (request != NULL)
{
*description = '\0';
gftp_generate_cache_description (request, description, sizeof (description),
ignore_directory);
}
else if (descr != NULL)
{
strncpy (description, descr, sizeof (description));
description[sizeof (description) - 1] = '\0';
}
else
return;
oldindexfile = gftp_expand_path (NULL, BASE_CONF_DIR "/cache/index.db");
if ((indexfd = gftp_fd_open (NULL, oldindexfile, O_RDONLY, 0)) == -1)
{
g_free (oldindexfile);
return;
}
newindexfile = gftp_expand_path (NULL, BASE_CONF_DIR "/cache/index.db.new");
if ((newfd = gftp_fd_open (request, newindexfile, O_WRONLY | O_CREAT,
S_IRUSR | S_IWUSR)) == -1)
{
g_free (oldindexfile);
g_free (newindexfile);
return;
}
*buf = '\0';
rbuf = NULL;
while (gftp_get_line (NULL, &rbuf, buf, sizeof (buf) - 1, indexfd) > 0)
{
if (gftp_parse_cache_line (request, ¢ry, buf) < 0)
continue;
del_entry = 0;
if (centry.expiration_date < now)
del_entry = 1;
else if (ignore_directory)
{
if (strncmp (centry.url, description, strlen (description)) == 0)
del_entry = 1;
}
else
{
if (strcmp (centry.url, description) == 0)
del_entry = 1;
}
if (del_entry)
unlink (centry.file);
else
{
/* Make sure we put the tabs back in the line. I do it this way
so that I don't have to allocate memory again for each line
as we read it */
gftp_restore_cache_line (¢ry);
/* Make sure when we call gftp_get_line() that we pass the read size
as sizeof(buf) - 1 so that we'll have room to put the newline */
len = strlen (buf);
buf[len--] = '\n';
if (gftp_fd_write (NULL, buf, len, newfd) < 0)
break;
}
}
close (indexfd);
close (newfd);
unlink (oldindexfile);
rename (newindexfile, oldindexfile);
g_free (oldindexfile);
g_free (newindexfile);
}
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