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tcpdump/print-hncp.c
Guy Harris 79a0579b3a Squelch a warning. 
time() is a standard C function; don't use time as the name of a
variable.
2016-08-02 12:59:47 -07:00

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/*
* Copyright (c) 2016 Antonin Décimo, Jean-Raphaël Gaglione
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
#include <stdlib.h>
#include <string.h>
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
static void
hncp_print_rec(netdissect_options *ndo,
const u_char *cp, u_int length, int indent);
void
hncp_print(netdissect_options *ndo,
const u_char *cp, u_int length)
{
ND_PRINT((ndo, "hncp (%d)", length));
hncp_print_rec(ndo, cp, length, 1);
}
/* RFC7787 */
#define DNCP_REQUEST_NETWORK_STATE 1
#define DNCP_REQUEST_NODE_STATE 2
#define DNCP_NODE_ENDPOINT 3
#define DNCP_NETWORK_STATE 4
#define DNCP_NODE_STATE 5
#define DNCP_PEER 8
#define DNCP_KEEP_ALIVE_INTERVAL 9
#define DNCP_TRUST_VERDICT 10
/* RFC7788 */
#define HNCP_HNCP_VERSION 32
#define HNCP_EXTERNAL_CONNECTION 33
#define HNCP_DELEGATED_PREFIX 34
#define HNCP_PREFIX_POLICY 43
#define HNCP_DHCPV4_DATA 37
#define HNCP_DHCPV6_DATA 38
#define HNCP_ASSIGNED_PREFIX 35
#define HNCP_NODE_ADDRESS 36
#define HNCP_DNS_DELEGATED_ZONE 39
#define HNCP_DOMAIN_NAME 40
#define HNCP_NODE_NAME 41
#define HNCP_MANAGED_PSK 42
/* See type_mask in hncp_print_rec below */
#define RANGE_DNCP_RESERVED 0x10000
#define RANGE_HNCP_UNASSIGNED 0x10001
#define RANGE_DNCP_PRIVATE_USE 0x10002
#define RANGE_DNCP_FUTURE_USE 0x10003
static const struct tok type_values[] = {
{ DNCP_REQUEST_NETWORK_STATE, "Request network state" },
{ DNCP_REQUEST_NODE_STATE, "Request node state" },
{ DNCP_NODE_ENDPOINT, "Node endpoint" },
{ DNCP_NETWORK_STATE, "Network state" },
{ DNCP_NODE_STATE, "Node state" },
{ DNCP_PEER, "Peer" },
{ DNCP_KEEP_ALIVE_INTERVAL, "Keep-alive interval" },
{ DNCP_TRUST_VERDICT, "Trust-Verdict" },
{ HNCP_HNCP_VERSION, "HNCP-Version" },
{ HNCP_EXTERNAL_CONNECTION, "External-Connection" },
{ HNCP_DELEGATED_PREFIX, "Delegated-Prefix" },
{ HNCP_PREFIX_POLICY, "Prefix-Policy" },
{ HNCP_DHCPV4_DATA, "DHCPv4-Data" },
{ HNCP_DHCPV6_DATA, "DHCPv6-Data" },
{ HNCP_ASSIGNED_PREFIX, "Assigned-Prefix" },
{ HNCP_NODE_ADDRESS, "Node-Address" },
{ HNCP_DNS_DELEGATED_ZONE, "DNS-Delegated-Zone" },
{ HNCP_DOMAIN_NAME, "Domain-Name" },
{ HNCP_NODE_NAME, "Node-Name" },
{ HNCP_MANAGED_PSK, "Managed-PSK" },
{ RANGE_DNCP_RESERVED, "Reserved" },
{ RANGE_HNCP_UNASSIGNED, "Unassigned" },
{ RANGE_DNCP_PRIVATE_USE, "Private use" },
{ RANGE_DNCP_FUTURE_USE, "Future use" },
{ 0, NULL}
};
#define DH4OPT_DNS_SERVERS 6 /* RFC2132 */
#define DH4OPT_NTP_SERVERS 42 /* RFC2132 */
#define DH4OPT_DOMAIN_SEARCH 119 /* RFC3397 */
static const struct tok dh4opt_str[] = {
{ DH4OPT_DNS_SERVERS, "DNS-server" },
{ DH4OPT_NTP_SERVERS, "NTP-server"},
{ DH4OPT_DOMAIN_SEARCH, "DNS-search" },
{ 0, NULL }
};
#define DH6OPT_DNS_SERVERS 23 /* RFC3646 */
#define DH6OPT_DOMAIN_LIST 24 /* RFC3646 */
#define DH6OPT_SNTP_SERVERS 31 /* RFC4075 */
static const struct tok dh6opt_str[] = {
{ DH6OPT_DNS_SERVERS, "DNS-server" },
{ DH6OPT_DOMAIN_LIST, "DNS-search-list" },
{ DH6OPT_SNTP_SERVERS, "SNTP-servers" },
{ 0, NULL }
};
static const char *
format_nid(const u_char *data)
{
static char buf[4][11+5];
static int i = 0;
i = (i + 1) % 4;
snprintf(buf[i], 16, "%02x:%02x:%02x:%02x",
data[0], data[1], data[2], data[3]);
return buf[i];
}
static const char *
format_256(const u_char *data)
{
static char buf[4][64+5];
static int i = 0;
i = (i + 1) % 4;
snprintf(buf[i], 28, "%016" PRIx64 "%016" PRIx64 "%016" PRIx64 "%016" PRIx64,
EXTRACT_64BITS(data),
EXTRACT_64BITS(data + 8),
EXTRACT_64BITS(data + 16),
EXTRACT_64BITS(data + 24)
);
return buf[i];
}
static const char *
format_interval(const uint16_t n)
{
static char buf[4][sizeof("000.00s")];
static int i = 0;
i = (i + 1) % 4;
if (n == 0)
return "0.0s (bogus)";
snprintf(buf[i], sizeof(buf[i]), "%u.%02us", n / 100, n % 100);
return buf[i];
}
static const char *
format_ip6addr(netdissect_options *ndo, const u_char *cp)
{
if (EXTRACT_64BITS(cp) == 0x0 && EXTRACT_32BITS(cp+8) == 0xffff)
return ipaddr_string(ndo, cp + 12);
else
return ip6addr_string(ndo, cp);
}
static int
print_prefix(netdissect_options *ndo, const u_char *prefix, u_int max_length)
{
int plenbytes;
static char buf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx::/128")];
static u_char prefix_v4[5];
if (prefix[0] >= 96 && max_length >= 13 && EXTRACT_64BITS(prefix+1) == 0x0 && EXTRACT_32BITS(prefix+9) == 0xffff) {
prefix_v4[0] = prefix[0]-96;
prefix_v4[1] = prefix[13];
prefix_v4[2] = prefix[14];
prefix_v4[3] = prefix[15];
prefix_v4[4] = prefix[16];
plenbytes = 12 + decode_prefix4(ndo, (const u_char *)prefix_v4, max_length-12, buf, 45);
} else {
plenbytes = decode_prefix6(ndo, prefix, max_length, buf, 45);
}
safeputs(ndo, (const u_char*)buf, 45);
return plenbytes;
}
static int
print_dns_label(netdissect_options *ndo,
const u_char *cp, u_int max_length, int print)
{
u_int length = 0;
while (length < max_length) {
u_int lab_length = cp[length++];
if (lab_length == 0)
return (int)length;
if (length > 1 && print)
safeputchar(ndo, '.');
if (length+lab_length > max_length) {
if (print)
safeputs(ndo, cp+length, max_length-length);
break;
}
if (print)
safeputs(ndo, cp+length, lab_length);
length += lab_length;
}
if (print)
ND_PRINT((ndo, "[|DNS]"));
return -1;
}
static int
dhcpv4_print(netdissect_options *ndo,
const u_char *cp, u_int length, int indent)
{
u_int i, t;
const u_char *tlv, *value;
uint8_t type, optlen;
i = 0;
while (i < length) {
tlv = cp + i;
type = (uint8_t)tlv[0];
optlen = (uint8_t)tlv[1];
value = tlv + 2;
ND_PRINT((ndo, "\n"));
for (t = indent; t > 0; t--)
ND_PRINT((ndo, "\t"));
ND_PRINT((ndo, "%s", tok2str(dh4opt_str, "Unknown", type)));
ND_PRINT((ndo," (%u)", optlen + 2 ));
switch (type) {
case DH4OPT_DNS_SERVERS:
case DH4OPT_NTP_SERVERS: {
if (optlen < 4 || optlen % 4 != 0) {
return -1;
}
for (t = 0; t < optlen; t += 4)
ND_PRINT((ndo, " %s", ipaddr_string(ndo, value + t)));
}
break;
case DH4OPT_DOMAIN_SEARCH: {
const u_char *tp = value;
while (tp < value + optlen) {
ND_PRINT((ndo, " "));
if ((tp = ns_nprint(ndo, tp, value + optlen)) == NULL)
return -1;
}
}
break;
}
i += 2 + optlen;
}
return 0;
}
static int
dhcpv6_print(netdissect_options *ndo,
const u_char *cp, u_int length, int indent)
{
u_int i, t;
const u_char *tlv, *value;
uint16_t type, optlen;
i = 0;
while (i < length) {
tlv = cp + i;
type = EXTRACT_16BITS(tlv);
optlen = EXTRACT_16BITS(tlv + 2);
value = tlv + 4;
ND_PRINT((ndo, "\n"));
for (t = indent; t > 0; t--)
ND_PRINT((ndo, "\t"));
ND_PRINT((ndo, "%s", tok2str(dh6opt_str, "Unknown", type)));
ND_PRINT((ndo," (%u)", optlen + 4 ));
switch (type) {
case DH6OPT_DNS_SERVERS:
case DH6OPT_SNTP_SERVERS: {
if (optlen % 16 != 0) {
ND_PRINT((ndo, " %s", istr));
return -1;
}
for (t = 0; t < optlen; t += 16)
ND_PRINT((ndo, " %s", ip6addr_string(ndo, value + t)));
}
break;
case DH6OPT_DOMAIN_LIST: {
const u_char *tp = value;
while (tp < value + optlen) {
ND_PRINT((ndo, " "));
if ((tp = ns_nprint(ndo, tp, value + optlen)) == NULL)
return -1;
}
}
break;
}
i += 4 + optlen;
}
return 0;
}
/* Determine in-line mode */
static int
is_in_line(netdissect_options *ndo, int indent)
{
return indent - 1 >= ndo->ndo_vflag && ndo->ndo_vflag < 3;
}
static void
print_type_in_line(netdissect_options *ndo,
uint32_t type, int count, int indent, int *first_one)
{
if (count > 0) {
if (*first_one) {
*first_one = 0;
if (indent > 1) {
u_int t;
ND_PRINT((ndo, "\n"));
for (t = indent; t > 0; t--)
ND_PRINT((ndo, "\t"));
} else {
ND_PRINT((ndo, " "));
}
} else {
ND_PRINT((ndo, ", "));
}
ND_PRINT((ndo, "%s", tok2str(type_values, "Easter Egg", type)));
if (count > 1)
ND_PRINT((ndo, " (x%d)", count));
}
}
void
hncp_print_rec(netdissect_options *ndo,
const u_char *cp, u_int length, int indent)
{
const int in_line = is_in_line(ndo, indent);
int first_one = 1;
u_int i, t;
uint32_t last_type_mask = -1;
int last_type_count = -1;
const u_char *tlv, *value;
uint16_t type, bodylen;
uint32_t type_mask;
i = 0;
while (i < length) {
tlv = cp + i;
if (!in_line) {
ND_PRINT((ndo, "\n"));
for (t = indent; t > 0; t--)
ND_PRINT((ndo, "\t"));
}
ND_TCHECK2(*tlv, 4);
if (i + 4 > length)
goto invalid;
type = EXTRACT_16BITS(tlv);
bodylen = EXTRACT_16BITS(tlv + 2);
value = tlv + 4;
ND_TCHECK2(*value, bodylen);
if (i + bodylen + 4 > length)
goto invalid;
type_mask =
(type == 0) ? RANGE_DNCP_RESERVED:
(44 <= type && type <= 511) ? RANGE_HNCP_UNASSIGNED:
(768 <= type && type <= 1023) ? RANGE_DNCP_PRIVATE_USE:
RANGE_DNCP_FUTURE_USE;
if (type == 6 || type == 7)
type_mask = RANGE_DNCP_FUTURE_USE;
/* defined types */
{
t = 0;
while (1) {
u_int key = type_values[t++].v;
if (key > 0xffff)
break;
if (key == type) {
type_mask = type;
break;
}
}
}
if (in_line) {
if (last_type_mask == type_mask) {
last_type_count++;
} else {
print_type_in_line(ndo, last_type_mask, last_type_count, indent, &first_one);
last_type_mask = type_mask;
last_type_count = 1;
}
goto skip_multiline;
}
ND_PRINT((ndo,"%s", tok2str(type_values, "Easter Egg (42)", type_mask) ));
if (type_mask > 0xffff)
ND_PRINT((ndo,": type=%u", type ));
ND_PRINT((ndo," (%u)", bodylen + 4 ));
switch (type_mask) {
case DNCP_REQUEST_NETWORK_STATE: {
if (bodylen != 0)
ND_PRINT((ndo, " %s", istr));
}
break;
case DNCP_REQUEST_NODE_STATE: {
const char *node_identifier;
if (bodylen != 4)
goto invalid;
node_identifier = format_nid(value);
ND_PRINT((ndo, " NID: %s", node_identifier));
}
break;
case DNCP_NODE_ENDPOINT: {
const char *node_identifier;
uint32_t endpoint_identifier;
if (bodylen != 8)
goto invalid;
node_identifier = format_nid(value);
endpoint_identifier = EXTRACT_32BITS(value + 4);
ND_PRINT((ndo, " NID: %s EPID: %08x",
node_identifier,
endpoint_identifier
));
}
break;
case DNCP_NETWORK_STATE: {
uint64_t hash;
if (bodylen != 8)
goto invalid;
hash = EXTRACT_64BITS(value);
ND_PRINT((ndo, " hash: %016" PRIx64, hash));
}
break;
case DNCP_NODE_STATE: {
const char *node_identifier, *interval;
uint32_t sequence_number;
uint64_t hash;
if (bodylen < 20)
goto invalid;
node_identifier = format_nid(value);
sequence_number = EXTRACT_32BITS(value + 4);
interval = format_interval(EXTRACT_32BITS(value + 8));
hash = EXTRACT_64BITS(value + 12);
ND_PRINT((ndo, " NID: %s seqno: %u %s hash: %016" PRIx64,
node_identifier,
sequence_number,
interval,
hash
));
hncp_print_rec(ndo, value+20, bodylen-20, indent+1);
}
break;
case DNCP_PEER: {
const char *peer_node_identifier;
uint32_t peer_endpoint_identifier, endpoint_identifier;
if (bodylen != 12)
goto invalid;
peer_node_identifier = format_nid(value);
peer_endpoint_identifier = EXTRACT_32BITS(value + 4);
endpoint_identifier = EXTRACT_32BITS(value + 8);
ND_PRINT((ndo, " Peer-NID: %s Peer-EPID: %08x Local-EPID: %08x",
peer_node_identifier,
peer_endpoint_identifier,
endpoint_identifier
));
}
break;
case DNCP_KEEP_ALIVE_INTERVAL: {
uint32_t endpoint_identifier;
const char *interval;
if (bodylen < 8)
goto invalid;
endpoint_identifier = EXTRACT_32BITS(value);
interval = format_interval(EXTRACT_32BITS(value + 4));
ND_PRINT((ndo, " EPID: %08x Interval: %s",
endpoint_identifier,
interval
));
}
break;
case DNCP_TRUST_VERDICT: {
if (bodylen <= 36)
goto invalid;
ND_PRINT((ndo, " Verdict: %u Fingerprint: %s Common Name: ",
*value,
format_256(value + 4)));
safeputs(ndo, value + 36, bodylen - 36);
}
break;
case HNCP_HNCP_VERSION: {
uint16_t capabilities;
uint8_t M, P, H, L;
if (bodylen < 5)
goto invalid;
capabilities = EXTRACT_16BITS(value + 2);
M = (uint8_t)((capabilities >> 12) & 0xf);
P = (uint8_t)((capabilities >> 8) & 0xf);
H = (uint8_t)((capabilities >> 4) & 0xf);
L = (uint8_t)(capabilities & 0xf);
ND_PRINT((ndo, " M: %u P: %u H: %u L: %u User-agent: ",
M, P, H, L
));
safeputs(ndo, value + 4, bodylen - 4);
}
break;
case HNCP_EXTERNAL_CONNECTION: {
/* Container TLV */
hncp_print_rec(ndo, value, bodylen, indent+1);
}
break;
case HNCP_DELEGATED_PREFIX: {
int l;
if (bodylen < 9 || bodylen < 9 + (value[8] + 7) / 8)
goto invalid;
ND_PRINT((ndo, " VLSO: %s PLSO: %s Prefix: ",
format_interval(EXTRACT_32BITS(value)),
format_interval(EXTRACT_32BITS(value + 4))
));
if ((l = print_prefix(ndo, value + 8, bodylen - 8)) < 0)
goto invalid;
l += 8 + (-l & 3);
if (bodylen >= l)
hncp_print_rec(ndo, value + l, bodylen - l, indent+1);
}
break;
case HNCP_PREFIX_POLICY: {
uint8_t policy;
if (bodylen < 1)
goto invalid;
policy = value[0];
ND_PRINT((ndo, " type: "));
if (policy == 0) {
if (bodylen != 1)
goto invalid;
ND_PRINT((ndo, "Internet connectivity"));
} else if (policy >= 1 && policy <= 128) {
ND_PRINT((ndo, "Dest-Prefix: "));
print_prefix(ndo, value, bodylen);
} else if (policy == 129) {
ND_PRINT((ndo, "DNS domain: "));
print_dns_label(ndo, value+1, bodylen-1, 1);
} else if (policy == 130) {
ND_PRINT((ndo, "Opaque UTF-8: "));
safeputs(ndo, value + 1, bodylen - 1);
} else if (policy == 131) {
if (bodylen != 1)
goto invalid;
ND_PRINT((ndo, "Restrictive assignment"));
} else if (policy >= 132) {
ND_PRINT((ndo, "Unknown (%u)", policy)); /* Reserved for future additions */
}
}
break;
case HNCP_DHCPV4_DATA: {
if (bodylen == 0)
goto invalid;
if (dhcpv4_print(ndo, value, bodylen, indent+1) != 0)
goto invalid;
}
break;
case HNCP_DHCPV6_DATA: {
if (bodylen == 0)
goto invalid;
if (dhcpv6_print(ndo, value, bodylen, indent+1) != 0)
goto invalid;
}
break;
case HNCP_ASSIGNED_PREFIX: {
uint8_t prty;
int l;
if (bodylen < 6 || bodylen < 6 + (value[5] + 7) / 8)
goto invalid;
prty = (uint8_t)(value[4] & 0xf);
ND_PRINT((ndo, " EPID: %08x Prty: %u",
EXTRACT_32BITS(value),
prty
));
ND_PRINT((ndo, " Prefix: "));
if ((l = print_prefix(ndo, value + 5, bodylen - 5)) < 0)
goto invalid;
l += 5;
l += -l & 3;
if (bodylen >= l)
hncp_print_rec(ndo, value + l, bodylen - l, indent+1);
}
break;
case HNCP_NODE_ADDRESS: {
uint32_t endpoint_identifier;
const char *ip_address;
if (bodylen < 20)
goto invalid;
endpoint_identifier = EXTRACT_32BITS(value);
ip_address = format_ip6addr(ndo, value + 4);
ND_PRINT((ndo, " EPID: %08x IP Address: %s",
endpoint_identifier,
ip_address
));
hncp_print_rec(ndo, value + 20, bodylen - 20, indent+1);
}
break;
case HNCP_DNS_DELEGATED_ZONE: {
const char *ip_address;
int len;
if (bodylen < 17)
goto invalid;
ip_address = format_ip6addr(ndo, value);
ND_PRINT((ndo, " IP-Address: %s %c%c%c ",
ip_address,
(value[16] & 4) ? 'l' : '-',
(value[16] & 2) ? 'b' : '-',
(value[16] & 1) ? 's' : '-'
));
len = print_dns_label(ndo, value+17, bodylen-17, 1);
if (len < 0)
goto invalid;
len += 17;
len += -len & 3;
if (bodylen >= len)
hncp_print_rec(ndo, value+len, bodylen-len, indent+1);
}
break;
case HNCP_DOMAIN_NAME: {
if (bodylen == 0)
goto invalid;
ND_PRINT((ndo, " Domain: "));
print_dns_label(ndo, value, bodylen, 1);
}
break;
case HNCP_NODE_NAME: {
u_int l;
if (bodylen < 17)
goto invalid;
l = value[16];
if (bodylen < 17 + l)
goto invalid;
ND_PRINT((ndo, " IP-Address: %s Name: ",
format_ip6addr(ndo, value)
));
if (l < 64) {
safeputchar(ndo, '"');
safeputs(ndo, value + 17, l);
safeputchar(ndo, '"');
} else {
ND_PRINT((ndo, "%s", istr));
}
l += 17;
l += -l & 3;
if (bodylen >= l)
hncp_print_rec(ndo, value + l, bodylen - l, indent+1);
}
break;
case HNCP_MANAGED_PSK: {
if (bodylen < 32)
goto invalid;
ND_PRINT((ndo, " PSK: %s", format_256(value)));
hncp_print_rec(ndo, value + 32, bodylen - 32, indent+1);
}
break;
case RANGE_DNCP_RESERVED:
case RANGE_HNCP_UNASSIGNED:
case RANGE_DNCP_PRIVATE_USE:
case RANGE_DNCP_FUTURE_USE:
break;
}
skip_multiline:
i += 4 + bodylen + (-bodylen & 3);
}
print_type_in_line(ndo, last_type_mask, last_type_count, indent, &first_one);
return;
trunc:
ND_PRINT((ndo, "%s", "[|hncp]"));
return;
invalid:
ND_PRINT((ndo, "%s", istr));
return;
}
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