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libxt_geoip.c    334 lines (288 with data), 8.8 kB

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/*
* "geoip" match extension for iptables
* Copyright Š Samuel Jean <peejix [at] people netfilter org>, 2004 - 2008
* Copyright Š Nicolas Bouliane <acidfu [at] people netfilter org>, 2004 - 2008
* Jan Engelhardt, 2008-2011
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License; either
* version 2 of the License, or any later version, as published by the
* Free Software Foundation.
*/
#include <sys/stat.h>
#include <sys/types.h>
#include <ctype.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <xtables.h>
#include "xt_geoip.h"
#include "compat_user.h"
#define GEOIP_DB_DIR "/usr/share/xt_geoip"
static void geoip_help(void)
{
printf (
"geoip match options:\n"
"[!] --src-cc, --source-country country[,country...]\n"
" Match packet coming from (one of) the specified country(ies)\n"
"[!] --dst-cc, --destination-country country[,country...]\n"
" Match packet going to (one of) the specified country(ies)\n"
"\n"
"NOTE: The country is inputed by its ISO3166 code.\n"
"\n"
);
}
static struct option geoip_opts[] = {
{.name = "dst-cc", .has_arg = true, .val = '2'},
{.name = "destination-country", .has_arg = true, .val = '2'},
{.name = "src-cc", .has_arg = true, .val = '1'},
{.name = "source-country", .has_arg = true, .val = '1'},
{NULL},
};
static void *
geoip_get_subnets(const char *code, uint32_t *count, uint8_t nfproto)
{
void *subnets;
struct stat sb;
char buf[256];
int fd;
/* Use simple integer vector files */
if (nfproto == NFPROTO_IPV6) {
#if __BYTE_ORDER == _BIG_ENDIAN
snprintf(buf, sizeof(buf), GEOIP_DB_DIR "/BE/%s.iv6", code);
#else
snprintf(buf, sizeof(buf), GEOIP_DB_DIR "/LE/%s.iv6", code);
#endif
} else {
#if __BYTE_ORDER == _BIG_ENDIAN
snprintf(buf, sizeof(buf), GEOIP_DB_DIR "/BE/%s.iv4", code);
#else
snprintf(buf, sizeof(buf), GEOIP_DB_DIR "/LE/%s.iv4", code);
#endif
}
if ((fd = open(buf, O_RDONLY)) < 0) {
fprintf(stderr, "Could not open %s: %s\n", buf, strerror(errno));
xtables_error(OTHER_PROBLEM, "Could not read geoip database");
}
fstat(fd, &sb);
*count = sb.st_size;
switch (nfproto) {
case NFPROTO_IPV6:
if (sb.st_size % sizeof(struct geoip_subnet6) != 0)
xtables_error(OTHER_PROBLEM,
"Database file %s seems to be corrupted", buf);
*count /= sizeof(struct geoip_subnet6);
break;
case NFPROTO_IPV4:
if (sb.st_size % sizeof(struct geoip_subnet4) != 0)
xtables_error(OTHER_PROBLEM,
"Database file %s seems to be corrupted", buf);
*count /= sizeof(struct geoip_subnet4);
break;
}
subnets = malloc(sb.st_size);
if (subnets == NULL)
xtables_error(OTHER_PROBLEM, "geoip: insufficient memory");
read(fd, subnets, sb.st_size);
close(fd);
return subnets;
}
static struct geoip_country_user *geoip_load_cc(const char *code,
unsigned short cc, uint8_t nfproto)
{
struct geoip_country_user *ginfo;
ginfo = malloc(sizeof(struct geoip_country_user));
if (!ginfo)
return NULL;
ginfo->subnets = (unsigned long)geoip_get_subnets(code,
&ginfo->count, nfproto);
ginfo->cc = cc;
return ginfo;
}
static u_int16_t
check_geoip_cc(char *cc, u_int16_t cc_used[], u_int8_t count)
{
u_int8_t i;
u_int16_t cc_int16;
if (strlen(cc) != 2) /* Country must be 2 chars long according
to the ISO3166 standard */
xtables_error(PARAMETER_PROBLEM,
"geoip: invalid country code '%s'", cc);
// Verification will fail if chars aren't uppercased.
// Make sure they are..
for (i = 0; i < 2; i++)
if (isalnum(cc[i]) != 0)
cc[i] = toupper(cc[i]);
else
xtables_error(PARAMETER_PROBLEM,
"geoip: invalid country code '%s'", cc);
/* Convert chars into a single 16 bit integer.
* FIXME: This assumes that a country code is
* exactly 2 chars long. If this is
* going to change someday, this whole
* match will need to be rewritten, anyway.
* - SJ */
cc_int16 = (cc[0] << 8) | cc[1];
// Check for presence of value in cc_used
for (i = 0; i < count; i++)
if (cc_int16 == cc_used[i])
return 0; // Present, skip it!
return cc_int16;
}
static unsigned int parse_geoip_cc(const char *ccstr, uint16_t *cc,
union geoip_country_group *mem, uint8_t nfproto)
{
char *buffer, *cp, *next;
u_int8_t i, count = 0;
u_int16_t cctmp;
buffer = strdup(ccstr);
if (!buffer)
xtables_error(OTHER_PROBLEM,
"geoip: insufficient memory available");
for (cp = buffer, i = 0; cp && i < XT_GEOIP_MAX; cp = next, i++)
{
next = strchr(cp, ',');
if (next) *next++ = '\0';
if ((cctmp = check_geoip_cc(cp, cc, count)) != 0) {
if ((mem[count++].user =
(unsigned long)geoip_load_cc(cp, cctmp, nfproto)) == 0)
xtables_error(OTHER_PROBLEM,
"geoip: insufficient memory available");
cc[count-1] = cctmp;
}
}
if (cp)
xtables_error(PARAMETER_PROBLEM,
"geoip: too many countries specified");
free(buffer);
if (count == 0)
xtables_error(PARAMETER_PROBLEM,
"geoip: don't know what happened");
return count;
}
static int geoip_parse(int c, bool invert, unsigned int *flags,
const char *arg, struct xt_geoip_match_info *info, uint8_t nfproto)
{
switch (c) {
case '1':
if (*flags & (XT_GEOIP_SRC | XT_GEOIP_DST))
xtables_error(PARAMETER_PROBLEM,
"geoip: Only exactly one of --source-country "
"or --destination-country must be specified!");
*flags |= XT_GEOIP_SRC;
if (invert)
*flags |= XT_GEOIP_INV;
info->count = parse_geoip_cc(arg, info->cc, info->mem,
nfproto);
info->flags = *flags;
return true;
case '2':
if (*flags & (XT_GEOIP_SRC | XT_GEOIP_DST))
xtables_error(PARAMETER_PROBLEM,
"geoip: Only exactly one of --source-country "
"or --destination-country must be specified!");
*flags |= XT_GEOIP_DST;
if (invert)
*flags |= XT_GEOIP_INV;
info->count = parse_geoip_cc(arg, info->cc, info->mem,
nfproto);
info->flags = *flags;
return true;
}
return false;
}
static int geoip_parse6(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
return geoip_parse(c, invert, flags, optarg,
(void *)(*match)->data, NFPROTO_IPV6);
}
static int geoip_parse4(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
return geoip_parse(c, invert, flags, optarg,
(void *)(*match)->data, NFPROTO_IPV4);
}
static void
geoip_final_check(unsigned int flags)
{
if (!flags)
xtables_error(PARAMETER_PROBLEM,
"geoip: missing arguments");
}
static void
geoip_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_geoip_match_info *info = (void*)match->data;
u_int8_t i;
if (info->flags & XT_GEOIP_SRC)
printf(" Source ");
else
printf(" Destination ");
if (info->count > 1)
printf("countries: ");
else
printf("country: ");
if (info->flags & XT_GEOIP_INV)
printf("! ");
for (i = 0; i < info->count; i++)
printf("%s%c%c", i ? "," : "", COUNTRY(info->cc[i]));
printf(" ");
}
static void
geoip_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_geoip_match_info *info = (void *)match->data;
u_int8_t i;
if (info->flags & XT_GEOIP_INV)
printf(" !");
if (info->flags & XT_GEOIP_SRC)
printf(" --source-country ");
else
printf(" --destination-country ");
for (i = 0; i < info->count; i++)
printf("%s%c%c", i ? "," : "", COUNTRY(info->cc[i]));
printf(" ");
}
static struct xtables_match geoip_match[] = {
{
.family = NFPROTO_IPV6,
.name = "geoip",
.revision = 1,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_geoip_match_info)),
.userspacesize = offsetof(struct xt_geoip_match_info, mem),
.help = geoip_help,
.parse = geoip_parse6,
.final_check = geoip_final_check,
.print = geoip_print,
.save = geoip_save,
.extra_opts = geoip_opts,
},
{
.family = NFPROTO_IPV4,
.name = "geoip",
.revision = 1,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_geoip_match_info)),
.userspacesize = offsetof(struct xt_geoip_match_info, mem),
.help = geoip_help,
.parse = geoip_parse4,
.final_check = geoip_final_check,
.print = geoip_print,
.save = geoip_save,
.extra_opts = geoip_opts,
},
};
static __attribute__((constructor)) void geoip_mt_ldr(void)
{
xtables_register_matches(geoip_match,
sizeof(geoip_match) / sizeof(*geoip_match));
}