transmission/libtransmission/blocklist.c

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/*
* This file Copyright (C) 2008-2014 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
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* $Id$
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h> /* bsearch (), qsort () */
#include <string.h>
#include "transmission.h"
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#include "blocklist.h"
#include "error.h"
#include "file.h"
#include "log.h"
#include "net.h"
#include "utils.h"
/***
**** PRIVATE
***/
struct tr_ipv4_range
{
uint32_t begin;
uint32_t end;
};
struct tr_blocklistFile
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{
bool isEnabled;
tr_sys_file_t fd;
size_t ruleCount;
uint64_t byteCount;
char * filename;
struct tr_ipv4_range * rules;
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};
static void
blocklistClose (tr_blocklistFile * b)
{
if (b->rules != NULL)
{
tr_sys_file_unmap (b->rules, b->byteCount, NULL);
tr_sys_file_close (b->fd, NULL);
b->rules = NULL;
b->ruleCount = 0;
b->byteCount = 0;
b->fd = TR_BAD_SYS_FILE;
}
}
static void
blocklistLoad (tr_blocklistFile * b)
{
tr_sys_file_t fd;
uint64_t byteCount;
tr_sys_path_info info;
char * base;
tr_error * error = NULL;
const char * err_fmt = _("Couldn't read \"%1$s\": %2$s");
blocklistClose (b);
if (!tr_sys_path_get_info (b->filename, 0, &info, NULL))
return;
byteCount = info.size;
if (byteCount == 0)
return;
fd = tr_sys_file_open (b->filename, TR_SYS_FILE_READ, 0, &error);
if (fd == TR_BAD_SYS_FILE)
{
tr_logAddError (err_fmt, b->filename, error->message);
tr_error_free (error);
return;
}
b->rules = tr_sys_file_map_for_reading (fd, 0, byteCount, &error);
if (!b->rules)
{
tr_logAddError (err_fmt, b->filename, error->message);
tr_sys_file_close (fd, NULL);
tr_error_free (error);
return;
}
b->fd = fd;
b->byteCount = byteCount;
b->ruleCount = byteCount / sizeof (struct tr_ipv4_range);
base = tr_sys_path_basename (b->filename, NULL);
tr_logAddInfo (_("Blocklist \"%s\" contains %"TR_PRIuSIZE" entries"), base, b->ruleCount);
tr_free (base);
}
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static void
blocklistEnsureLoaded (tr_blocklistFile * b)
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{
if (b->rules == NULL)
blocklistLoad (b);
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}
static int
compareAddressToRange (const void * va, const void * vb)
{
const uint32_t * a = va;
const struct tr_ipv4_range * b = vb;
if (*a < b->begin) return -1;
if (*a > b->end) return 1;
return 0;
}
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static void
blocklistDelete (tr_blocklistFile * b)
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{
blocklistClose (b);
tr_sys_path_remove (b->filename, NULL);
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}
/***
**** PACKAGE-VISIBLE
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***/
tr_blocklistFile *
tr_blocklistFileNew (const char * filename, bool isEnabled)
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{
tr_blocklistFile * b;
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b = tr_new0 (tr_blocklistFile, 1);
b->fd = TR_BAD_SYS_FILE;
b->filename = tr_strdup (filename);
b->isEnabled = isEnabled;
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return b;
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}
const char*
tr_blocklistFileGetFilename (const tr_blocklistFile * b)
{
return b->filename;
}
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void
tr_blocklistFileFree (tr_blocklistFile * b)
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{
blocklistClose (b);
tr_free (b->filename);
tr_free (b);
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}
bool
tr_blocklistFileExists (const tr_blocklistFile * b)
{
return tr_sys_path_exists (b->filename, NULL);
}
int
tr_blocklistFileGetRuleCount (const tr_blocklistFile * b)
{
blocklistEnsureLoaded ((tr_blocklistFile*)b);
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return b->ruleCount;
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}
bool
tr_blocklistFileIsEnabled (tr_blocklistFile * b)
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{
return b->isEnabled;
}
void
tr_blocklistFileSetEnabled (tr_blocklistFile * b, bool isEnabled)
{
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assert (b != NULL);
assert (tr_isBool (isEnabled));
b->isEnabled = isEnabled;
}
bool
tr_blocklistFileHasAddress (tr_blocklistFile * b, const tr_address * addr)
{
uint32_t needle;
const struct tr_ipv4_range * range;
assert (tr_address_is_valid (addr));
if (!b->isEnabled || addr->type == TR_AF_INET6)
return false;
blocklistEnsureLoaded (b);
if (!b->rules || !b->ruleCount)
return false;
needle = ntohl (addr->addr.addr4.s_addr);
range = bsearch (&needle,
b->rules,
b->ruleCount,
sizeof (struct tr_ipv4_range),
compareAddressToRange);
return range != NULL;
}
/*
* P2P plaintext format: "comment:x.x.x.x-y.y.y.y"
* http://wiki.phoenixlabs.org/wiki/P2P_Format
* http://en.wikipedia.org/wiki/PeerGuardian#P2P_plaintext_format
*/
static bool
parseLine1 (const char * line, struct tr_ipv4_range * range)
{
char * walk;
int b[4];
int e[4];
char str[64];
tr_address addr;
walk = strrchr (line, ':');
if (!walk)
return false;
++walk; /* walk past the colon */
if (sscanf (walk, "%d.%d.%d.%d-%d.%d.%d.%d",
&b[0], &b[1], &b[2], &b[3],
&e[0], &e[1], &e[2], &e[3]) != 8)
return false;
tr_snprintf (str, sizeof (str), "%d.%d.%d.%d", b[0], b[1], b[2], b[3]);
if (!tr_address_from_string (&addr, str))
return false;
range->begin = ntohl (addr.addr.addr4.s_addr);
tr_snprintf (str, sizeof (str), "%d.%d.%d.%d", e[0], e[1], e[2], e[3]);
if (!tr_address_from_string (&addr, str))
return false;
range->end = ntohl (addr.addr.addr4.s_addr);
return true;
}
/*
* DAT format: "000.000.000.000 - 000.255.255.255 , 000 , invalid ip"
* http://wiki.phoenixlabs.org/wiki/DAT_Format
*/
static bool
parseLine2 (const char * line, struct tr_ipv4_range * range)
{
int unk;
int a[4];
int b[4];
char str[32];
tr_address addr;
if (sscanf (line, "%3d.%3d.%3d.%3d - %3d.%3d.%3d.%3d , %3d , ",
&a[0], &a[1], &a[2], &a[3],
&b[0], &b[1], &b[2], &b[3],
&unk) != 9)
return false;
tr_snprintf (str, sizeof (str), "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
if (!tr_address_from_string (&addr, str))
return false;
range->begin = ntohl (addr.addr.addr4.s_addr);
tr_snprintf (str, sizeof (str), "%d.%d.%d.%d", b[0], b[1], b[2], b[3]);
if (!tr_address_from_string (&addr, str))
return false;
range->end = ntohl (addr.addr.addr4.s_addr);
return true;
}
static bool
parseLine (const char * line, struct tr_ipv4_range * range)
{
return parseLine1 (line, range)
|| parseLine2 (line, range);
}
static int
compareAddressRangesByFirstAddress (const void * va, const void * vb)
{
const struct tr_ipv4_range * a = va;
const struct tr_ipv4_range * b = vb;
if (a->begin != b->begin)
return a->begin < b->begin ? -1 : 1;
return 0;
}
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int
tr_blocklistFileSetContent (tr_blocklistFile * b, const char * filename)
{
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tr_sys_file_t in;
tr_sys_file_t out;
int inCount = 0;
char line[2048];
const char * err_fmt = _("Couldn't read \"%1$s\": %2$s");
struct tr_ipv4_range * ranges = NULL;
size_t ranges_alloc = 0;
size_t ranges_count = 0;
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tr_error * error = NULL;
if (!filename)
{
blocklistDelete (b);
return 0;
}
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in = tr_sys_file_open (filename, TR_SYS_FILE_READ, 0, &error);
if (in == TR_BAD_SYS_FILE)
{
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tr_logAddError (err_fmt, filename, error->message);
tr_error_free (error);
return 0;
}
blocklistClose (b);
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out = tr_sys_file_open (b->filename,
TR_SYS_FILE_WRITE | TR_SYS_FILE_CREATE | TR_SYS_FILE_TRUNCATE,
0666, &error);
if (out == TR_BAD_SYS_FILE)
{
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tr_logAddError (err_fmt, b->filename, error->message);
tr_error_free (error);
tr_sys_file_close (in, NULL);
return 0;
}
/* load the rules into memory */
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while (tr_sys_file_read_line (in, line, sizeof (line), NULL))
{
struct tr_ipv4_range range;
++inCount;
if (!parseLine (line, &range))
{
/* don't try to display the actual lines - it causes issues */
tr_logAddError (_("blocklist skipped invalid address at line %d"), inCount);
continue;
}
if (ranges_alloc == ranges_count)
{
ranges_alloc += 4096; /* arbitrary */
ranges = tr_renew (struct tr_ipv4_range, ranges, ranges_alloc);
}
ranges[ranges_count++] = range;
}
if (ranges_count > 0) /* sort and merge */
{
struct tr_ipv4_range * r;
struct tr_ipv4_range * keep = ranges;
const struct tr_ipv4_range * end;
/* sort */
qsort (ranges, ranges_count, sizeof (struct tr_ipv4_range),
compareAddressRangesByFirstAddress);
/* merge */
for (r=ranges+1, end=ranges+ranges_count; r!=end; ++r) {
if (keep->end < r->begin)
*++keep = *r;
else if (keep->end < r->end)
keep->end = r->end;
}
ranges_count = keep + 1 - ranges;
#ifndef NDEBUG
/* sanity checks: make sure the rules are sorted
* in ascending order and don't overlap */
{
size_t i;
for (i=0; i<ranges_count; ++i)
assert (ranges[i].begin <= ranges[i].end);
for (i=1; i<ranges_count; ++i)
assert (ranges[i-1].end < ranges[i].begin);
}
#endif
}
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if (!tr_sys_file_write (out, ranges, sizeof (struct tr_ipv4_range) * ranges_count, NULL, &error))
{
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tr_logAddError (_("Couldn't save file \"%1$s\": %2$s"), b->filename, error->message);
tr_error_free (error);
}
else
{
char * base = tr_sys_path_basename (b->filename, NULL);
tr_logAddInfo (_("Blocklist \"%s\" updated with %"TR_PRIuSIZE" entries"), base, ranges_count);
tr_free (base);
}
tr_free (ranges);
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tr_sys_file_close (out, NULL);
tr_sys_file_close (in, NULL);
blocklistLoad (b);
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return ranges_count;
}