247 lines
5.5 KiB
C
247 lines
5.5 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/ipv6.h>
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#include <epan/addr_resolv.h>
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#include <epan/to_str.h>
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static void
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ipv6_fvalue_set(fvalue_t *fv, const guint8 *value)
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{
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memcpy(fv->value.ipv6.addr.bytes, value, FT_IPv6_LEN);
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fv->value.ipv6.prefix = 128;
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}
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static gboolean
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ipv6_from_literal(fvalue_t *fv, const char *s, gboolean allow_partial_value _U_, gchar **err_msg)
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{
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const char *slash;
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const char *addr_str;
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char *addr_str_to_free = NULL;
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unsigned int nmask_bits;
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fvalue_t *nmask_fvalue;
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/* Look for prefix: 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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if (!get_host_ipaddr6(addr_str, &(fv->value.ipv6.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 IPv6 address.", s);
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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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/* If prefix */
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if (slash) {
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/* XXX - this is inefficient */
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nmask_fvalue = fvalue_from_literal(FT_UINT32, slash+1, 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 > 128) {
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if (err_msg != NULL) {
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*err_msg = ws_strdup_printf("Prefix in a IPv6 address should be <= 128, 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.ipv6.prefix = nmask_bits;
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} else {
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/* Not CIDR; mask covers entire address. */
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fv->value.ipv6.prefix = 128;
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}
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return TRUE;
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}
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static char *
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ipv6_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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return ip6_to_str(scope, &(fv->value.ipv6.addr));
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}
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static const guint8 *
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value_get(fvalue_t *fv)
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{
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return fv->value.ipv6.addr.bytes;
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}
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static const guint8 bitmasks[9] =
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{ 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
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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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const ipv6_addr_and_prefix *a = &(fv_a->value.ipv6);
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const ipv6_addr_and_prefix *b = &(fv_b->value.ipv6);
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guint32 prefix;
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int pos = 0;
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prefix = MIN(a->prefix, b->prefix); /* MIN() like IPv4 */
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prefix = MIN(prefix, 128); /* sanitize, max prefix is 128 */
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while (prefix >= 8) {
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gint byte_a = (gint) (a->addr.bytes[pos]);
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gint byte_b = (gint) (b->addr.bytes[pos]);
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if (byte_a != byte_b) {
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*cmp = byte_a - byte_b;
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return FT_OK;
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}
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prefix -= 8;
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pos++;
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}
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if (prefix != 0) {
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gint byte_a = (gint) (a->addr.bytes[pos] & (bitmasks[prefix]));
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gint byte_b = (gint) (b->addr.bytes[pos] & (bitmasks[prefix]));
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if (byte_a != byte_b) {
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*cmp = byte_a - byte_b;
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return FT_OK;
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}
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}
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*cmp = 0;
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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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const ipv6_addr_and_prefix *a = &(fv_a->value.ipv6);
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const ipv6_addr_and_prefix *b = &(fv_b->value.ipv6);
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guint32 prefix;
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int pos = 0;
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prefix = MIN(a->prefix, b->prefix); /* MIN() like in IPv4 */
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prefix = MIN(prefix, 128); /* sanitize, max prefix is 128 */
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while (prefix >= 8) {
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dst->value.ipv6.addr.bytes[pos] =
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a->addr.bytes[pos] & b->addr.bytes[pos];
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prefix -= 8;
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pos++;
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}
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if (prefix != 0) {
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dst->value.ipv6.addr.bytes[pos] =
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a->addr.bytes[pos] & b->addr.bytes[pos] & bitmasks[prefix];
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}
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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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data = fv->value.ipv6.addr.bytes + 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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ws_in6_addr zero = { 0 };
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return memcmp(&fv_a->value.ipv6.addr, &zero, sizeof(ws_in6_addr)) == 0;
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}
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void
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ftype_register_ipv6(void)
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{
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static ftype_t ipv6_type = {
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FT_IPv6, /* ftype */
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"FT_IPv6", /* name */
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"IPv6 address", /* pretty_name */
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FT_IPv6_LEN, /* 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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ipv6_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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ipv6_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_bytes = ipv6_fvalue_set }, /* union set_value */
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{ .get_value_bytes = value_get }, /* union get_value */
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cmp_order,
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NULL, /* XXX, cmp_contains, needed? ipv4 doesn't support it */
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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_IPv6, &ipv6_type);
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}
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void
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ftype_register_pseudofields_ipv6(int proto)
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{
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static int hf_ft_ipv6;
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static hf_register_info hf_ftypes[] = {
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{ &hf_ft_ipv6,
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{ "FT_IPv6", "_ws.ftypes.ipv6",
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FT_IPv6, 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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