221 lines
4.9 KiB
C
221 lines
4.9 KiB
C
/*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 2001 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <string.h>
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#include <ftypes-int.h>
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#include <epan/ipv4.h>
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#include <epan/addr_and_mask.h>
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#include <epan/addr_resolv.h>
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static void
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set_uinteger(fvalue_t *fv, guint32 value)
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{
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fv->value.ipv4.addr = g_ntohl(value);
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fv->value.ipv4.nmask = ip_get_subnet_mask(32);
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}
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static guint32
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value_get(fvalue_t *fv)
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{
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return g_htonl(fv->value.ipv4.addr);
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}
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static gboolean
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val_from_literal(fvalue_t *fv, const char *s, gboolean allow_partial_value _U_, gchar **err_msg)
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{
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guint32 addr;
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unsigned int nmask_bits;
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const char *slash, *net_str;
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const char *addr_str;
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char *addr_str_to_free = NULL;
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fvalue_t *nmask_fvalue;
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/* Look for CIDR: Is there a single slash in the string? */
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slash = strchr(s, '/');
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if (slash) {
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/* Make a copy of the string up to but not including the
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* slash; that's the address portion. */
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addr_str_to_free = wmem_strndup(NULL, s, slash - s);
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addr_str = addr_str_to_free;
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}
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else {
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addr_str = s;
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}
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if (!get_host_ipaddr(addr_str, &addr)) {
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if (err_msg != NULL) {
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*err_msg = ws_strdup_printf("\"%s\" is not a valid hostname or IPv4 address.",
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addr_str);
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}
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if (addr_str_to_free)
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wmem_free(NULL, addr_str_to_free);
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return FALSE;
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}
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if (addr_str_to_free)
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wmem_free(NULL, addr_str_to_free);
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fv->value.ipv4.addr = g_ntohl(addr);
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/* If CIDR, get netmask bits. */
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if (slash) {
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/* Skip past the slash */
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net_str = slash + 1;
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/* XXX - this is inefficient */
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nmask_fvalue = fvalue_from_literal(FT_UINT32, net_str, FALSE, err_msg);
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if (!nmask_fvalue) {
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return FALSE;
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}
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nmask_bits = fvalue_get_uinteger(nmask_fvalue);
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fvalue_free(nmask_fvalue);
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if (nmask_bits > 32) {
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if (err_msg != NULL) {
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*err_msg = ws_strdup_printf("Netmask bits in a CIDR IPv4 address should be <= 32, not %u",
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nmask_bits);
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}
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return FALSE;
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}
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fv->value.ipv4.nmask = ip_get_subnet_mask(nmask_bits);
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}
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else {
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/* Not CIDR; mask covers entire address. */
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fv->value.ipv4.nmask = ip_get_subnet_mask(32);
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}
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return TRUE;
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}
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static char *
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val_to_repr(wmem_allocator_t *scope, const fvalue_t *fv, ftrepr_t rtype _U_, int field_display _U_)
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{
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guint32 ipv4_net_order = g_htonl(fv->value.ipv4.addr);
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return ip_to_str(scope, (guint8*)&ipv4_net_order);
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}
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/* Compares two ipv4_addr_and_masks, taking into account the less restrictive of the
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* two netmasks, applying that netmask to both addrs.
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*
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* So, for example, w.x.y.z/32 eq w.x.y.0/24 is TRUE.
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*/
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static enum ft_result
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cmp_order(const fvalue_t *fv_a, const fvalue_t *fv_b, int *cmp)
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{
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guint32 addr_a, addr_b, nmask;
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nmask = MIN(fv_a->value.ipv4.nmask, fv_b->value.ipv4.nmask);
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addr_a = fv_a->value.ipv4.addr & nmask;
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addr_b = fv_b->value.ipv4.addr & nmask;
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if (addr_a == addr_b)
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*cmp = 0;
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else
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*cmp = addr_a < addr_b ? -1 : 1;
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return FT_OK;
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}
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static enum ft_result
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bitwise_and(fvalue_t *dst, const fvalue_t *fv_a, const fvalue_t *fv_b, char **err_ptr _U_)
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{
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dst->value.ipv4 = fv_a->value.ipv4;
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dst->value.ipv4.addr &= (fv_b->value.ipv4.addr & fv_b->value.ipv4.nmask);
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return FT_OK;
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}
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static void
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slice(fvalue_t *fv, GByteArray *bytes, guint offset, guint length)
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{
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guint8* data;
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guint32 addr = g_htonl(fv->value.ipv4.addr);
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data = ((guint8*)&addr)+offset;
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g_byte_array_append(bytes, data, length);
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}
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static gboolean
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is_zero(const fvalue_t *fv_a)
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{
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return fv_a->value.ipv4.addr == 0;
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}
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void
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ftype_register_ipv4(void)
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{
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static ftype_t ipv4_type = {
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FT_IPv4, /* ftype */
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"FT_IPv4", /* name */
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"IPv4 address", /* pretty_name */
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4, /* wire_size */
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NULL, /* new_value */
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NULL, /* copy_value */
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NULL, /* free_value */
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val_from_literal, /* val_from_literal */
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NULL, /* val_from_string */
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NULL, /* val_from_charconst */
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val_to_repr, /* val_to_string_repr */
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NULL, /* val_to_uinteger64 */
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NULL, /* val_to_sinteger64 */
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{ .set_value_uinteger = set_uinteger }, /* union set_value */
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{ .get_value_uinteger = value_get }, /* union get_value */
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cmp_order,
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NULL, /* cmp_contains */
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NULL, /* cmp_matches */
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is_zero,
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NULL,
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NULL,
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slice,
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bitwise_and,
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NULL, /* unary_minus */
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NULL, /* add */
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NULL, /* subtract */
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NULL, /* multiply */
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NULL, /* divide */
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NULL, /* modulo */
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};
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ftype_register(FT_IPv4, &ipv4_type);
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}
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void
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ftype_register_pseudofields_ipv4(int proto)
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{
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static int hf_ft_ipv4;
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static hf_register_info hf_ftypes[] = {
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{ &hf_ft_ipv4,
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{ "FT_IPv4", "_ws.ftypes.ipv4",
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FT_IPv4, BASE_NONE, NULL, 0x00,
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NULL, HFILL }
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},
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};
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proto_register_field_array(proto, hf_ftypes, array_length(hf_ftypes));
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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