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/*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 2001 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <string.h>
#include <ftypes-int.h>
#include <epan/addr_resolv.h>
#include <wsutil/bits_count_ones.h>
#include <wsutil/strtoi.h>
#include <wsutil/inet_cidr.h>
static void
value_set_ipv4(fvalue_t *fv, const ipv4_addr_and_mask *ipv4)
{
fv->value.ipv4 = *ipv4;
}
static const ipv4_addr_and_mask *
value_get_ipv4(fvalue_t *fv)
{
return &fv->value.ipv4;
}
static bool
val_from_literal(fvalue_t *fv, const char *s, bool allow_partial_value _U_, char **err_msg)
{
uint32_t addr;
uint32_t nmask_bits;
const char *endptr;
const char *slash, *net_str;
const char *addr_str;
char *addr_str_to_free = NULL;
/* Look for CIDR: Is there a single slash in the string? */
slash = strchr(s, '/');
if (slash) {
/* Make a copy of the string up to but not including the
* slash; that's the address portion. */
addr_str_to_free = wmem_strndup(NULL, s, slash - s);
addr_str = addr_str_to_free;
}
else {
addr_str = s;
}
if (!get_host_ipaddr(addr_str, &addr)) {
if (err_msg != NULL) {
*err_msg = ws_strdup_printf("\"%s\" is not a valid hostname or IPv4 address.",
addr_str);
}
if (addr_str_to_free)
wmem_free(NULL, addr_str_to_free);
return false;
}
if (addr_str_to_free)
wmem_free(NULL, addr_str_to_free);
fv->value.ipv4.addr = g_ntohl(addr);
/* If CIDR, get netmask bits. */
if (slash) {
/* Skip past the slash */
net_str = slash + 1;
if(!ws_strtou32(net_str, &endptr, &nmask_bits) || *endptr != '\0') {
if (err_msg != NULL) {
*err_msg = ws_strdup_printf("%s in not a valid mask", slash+1);
}
return false;
}
if (nmask_bits > 32) {
if (err_msg != NULL) {
*err_msg = ws_strdup_printf("Netmask bits in a CIDR IPv4 address should be <= 32, not %u",
nmask_bits);
}
return false;
}
fv->value.ipv4.nmask = ws_ipv4_get_subnet_mask(nmask_bits);
}
else {
/* Not CIDR; mask covers entire address. */
fv->value.ipv4.nmask = ws_ipv4_get_subnet_mask(32);
}
return true;
}
static char *
val_to_repr(wmem_allocator_t *scope, const fvalue_t *fv, ftrepr_t rtype _U_, int field_display _U_)
{
char buf[WS_INET_ADDRSTRLEN];
char *repr;
ip_num_to_str_buf(fv->value.ipv4.addr, buf, sizeof(buf));
if (fv->value.ipv4.nmask != 0 && fv->value.ipv4.nmask != 0xffffffff)
repr = wmem_strdup_printf(scope, "%s/%d", buf, ws_count_ones(fv->value.ipv4.nmask));
else
repr = wmem_strdup(scope, buf);
return repr;
}
/* Compares two ipv4_addr_and_masks, taking into account the less restrictive of the
* two netmasks, applying that netmask to both addrs.
*
* So, for example, w.x.y.z/32 eq w.x.y.0/24 is true.
*/
static enum ft_result
cmp_order(const fvalue_t *fv_a, const fvalue_t *fv_b, int *cmp)
{
uint32_t addr_a, addr_b, nmask;
nmask = MIN(fv_a->value.ipv4.nmask, fv_b->value.ipv4.nmask);
addr_a = fv_a->value.ipv4.addr & nmask;
addr_b = fv_b->value.ipv4.addr & nmask;
if (addr_a == addr_b)
*cmp = 0;
else
*cmp = addr_a < addr_b ? -1 : 1;
return FT_OK;
}
static enum ft_result
bitwise_and(fvalue_t *dst, const fvalue_t *fv_a, const fvalue_t *fv_b, char **err_ptr _U_)
{
dst->value.ipv4 = fv_a->value.ipv4;
dst->value.ipv4.addr &= (fv_b->value.ipv4.addr & fv_b->value.ipv4.nmask);
return FT_OK;
}
static unsigned
len(fvalue_t *fv _U_)
{
return 4;
}
static void
slice(fvalue_t *fv, GByteArray *bytes, unsigned offset, unsigned length)
{
uint8_t* data;
uint32_t addr = g_htonl(fv->value.ipv4.addr);
data = ((uint8_t*)&addr)+offset;
g_byte_array_append(bytes, data, length);
}
static unsigned
ipv4_hash(const fvalue_t *fv)
{
int64_t val1 = fv->value.ipv4.addr;
int64_t val2 = fv->value.ipv4.nmask;
return g_int64_hash(&val1) ^ g_int64_hash(&val2);
}
static bool
is_zero(const fvalue_t *fv_a)
{
return fv_a->value.ipv4.addr == 0;
}
void
ftype_register_ipv4(void)
{
static ftype_t ipv4_type = {
FT_IPv4, /* ftype */
4, /* wire_size */
NULL, /* new_value */
NULL, /* copy_value */
NULL, /* free_value */
val_from_literal, /* val_from_literal */
NULL, /* val_from_string */
NULL, /* val_from_charconst */
NULL, /* val_from_uinteger64 */
NULL, /* val_from_sinteger64 */
NULL, /* val_from_double */
val_to_repr, /* val_to_string_repr */
NULL, /* val_to_uinteger64 */
NULL, /* val_to_sinteger64 */
NULL, /* val_to_double */
{ .set_value_ipv4 = value_set_ipv4 }, /* union set_value */
{ .get_value_ipv4 = value_get_ipv4 }, /* union get_value */
cmp_order,
NULL, /* cmp_contains */
NULL, /* cmp_matches */
ipv4_hash,
is_zero,
NULL,
len,
(FvalueSlice)slice,
bitwise_and,
NULL, /* unary_minus */
NULL, /* add */
NULL, /* subtract */
NULL, /* multiply */
NULL, /* divide */
NULL, /* modulo */
};
ftype_register(FT_IPv4, &ipv4_type);
}
void
ftype_register_pseudofields_ipv4(int proto)
{
static int hf_ft_ipv4;
static hf_register_info hf_ftypes[] = {
{ &hf_ft_ipv4,
{ "FT_IPv4", "_ws.ftypes.ipv4",
FT_IPv4, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
};
proto_register_field_array(proto, hf_ftypes, array_length(hf_ftypes));
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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