* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
+
+/* \summary: IPv6 DHCP printer */
+
/*
* RFC3315: DHCPv6
* supported DHCPv6 options:
#include "config.h"
#endif
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
#include <stdio.h>
#include <string.h>
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
/* DHCP6 base packet format */
struct dhcp6 {
union {
- uint8_t m;
- uint32_t x;
+ nd_uint8_t m;
+ nd_uint32_t x;
} dh6_msgtypexid;
/* options follow */
};
/* DHCPv6 relay messages */
struct dhcp6_relay {
- uint8_t dh6relay_msgtype;
- uint8_t dh6relay_hcnt;
- uint8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */
- uint8_t dh6relay_peeraddr[16];
+ nd_uint8_t dh6relay_msgtype;
+ nd_uint8_t dh6relay_hcnt;
+ nd_uint8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */
+ nd_uint8_t dh6relay_peeraddr[16];
/* options follow */
};
# define DH6OPT_NTP_SUBOPTION_MC_ADDR 2
# define DH6OPT_NTP_SUBOPTION_SRV_FQDN 3
#define DH6OPT_AFTR_NAME 64
+#define DH6OPT_MUDURL 112
static const struct tok dh6opt_str[] = {
{ DH6OPT_CLIENTID, "client-ID" },
{ DH6OPT_LQ_CLIENT_LINK, "LQ-client-link" },
{ DH6OPT_NTP_SERVER, "NTP-server" },
{ DH6OPT_AFTR_NAME, "AFTR-Name" },
+ { DH6OPT_MUDURL, "MUD-URL" },
{ 0, NULL }
};
static const struct tok dh6opt_stcode_str[] = {
- { DH6OPT_STCODE_SUCCESS, "success" },
- { DH6OPT_STCODE_UNSPECFAIL, "unspec failure" },
- { DH6OPT_STCODE_NOADDRAVAIL, "no addresses" },
- { DH6OPT_STCODE_NOBINDING, "no binding" },
- { DH6OPT_STCODE_NOTONLINK, "not on-link" },
- { DH6OPT_STCODE_USEMULTICAST, "use multicast" },
- { DH6OPT_STCODE_NOPREFIXAVAIL, "no prefixes" },
- { DH6OPT_STCODE_UNKNOWNQUERYTYPE, "unknown query type" },
- { DH6OPT_STCODE_MALFORMEDQUERY, "malformed query" },
- { DH6OPT_STCODE_NOTCONFIGURED, "not configured" },
- { DH6OPT_STCODE_NOTALLOWED, "not allowed" },
+ { DH6OPT_STCODE_SUCCESS, "Success" }, /* RFC3315 */
+ { DH6OPT_STCODE_UNSPECFAIL, "UnspecFail" }, /* RFC3315 */
+ { DH6OPT_STCODE_NOADDRAVAIL, "NoAddrsAvail" }, /* RFC3315 */
+ { DH6OPT_STCODE_NOBINDING, "NoBinding" }, /* RFC3315 */
+ { DH6OPT_STCODE_NOTONLINK, "NotOnLink" }, /* RFC3315 */
+ { DH6OPT_STCODE_USEMULTICAST, "UseMulticast" }, /* RFC3315 */
+ { DH6OPT_STCODE_NOPREFIXAVAIL, "NoPrefixAvail" }, /* RFC3633 */
+ { DH6OPT_STCODE_UNKNOWNQUERYTYPE, "UnknownQueryType" }, /* RFC5007 */
+ { DH6OPT_STCODE_MALFORMEDQUERY, "MalformedQuery" }, /* RFC5007 */
+ { DH6OPT_STCODE_NOTCONFIGURED, "NotConfigured" }, /* RFC5007 */
+ { DH6OPT_STCODE_NOTALLOWED, "NotAllowed" }, /* RFC5007 */
{ 0, NULL }
};
struct dhcp6opt {
- uint16_t dh6opt_type;
- uint16_t dh6opt_len;
+ nd_uint16_t dh6opt_type;
+ nd_uint16_t dh6opt_len;
/* type-dependent data follows */
};
while (cp < ep) {
if (ep < cp + sizeof(*dh6o))
goto trunc;
- dh6o = (struct dhcp6opt *)cp;
+ dh6o = (const struct dhcp6opt *)cp;
ND_TCHECK(*dh6o);
optlen = EXTRACT_16BITS(&dh6o->dh6opt_len);
if (ep < cp + sizeof(*dh6o) + optlen)
goto trunc;
opttype = EXTRACT_16BITS(&dh6o->dh6opt_type);
ND_PRINT((ndo, " (%s", tok2str(dh6opt_str, "opt_%u", opttype)));
+ ND_TCHECK2(*(cp + sizeof(*dh6o)), optlen);
switch (opttype) {
case DH6OPT_CLIENTID:
case DH6OPT_SERVERID:
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
switch (EXTRACT_16BITS(tp)) {
case 1:
if (optlen >= 2 + 6) {
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0])));
ND_PRINT((ndo, " pltime:%u vltime:%u",
EXTRACT_32BITS(&tp[16]),
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
for (i = 0; i < optlen; i += 2) {
ND_PRINT((ndo, " %s",
tok2str(dh6opt_str, "opt_%u", EXTRACT_16BITS(&tp[i]))));
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %d)", *tp));
break;
case DH6OPT_ELAPSED_TIME:
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %d)", EXTRACT_16BITS(tp)));
break;
case DH6OPT_RELAY_MSG:
ND_PRINT((ndo, " ("));
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
dhcp6_print(ndo, tp, optlen);
ND_PRINT((ndo, ")"));
break;
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
auth_proto = *tp;
switch (auth_proto) {
case DH6OPT_AUTHPROTO_DELAYED:
* Since we cannot predict the encoding, print hex dump
* at most 10 characters.
*/
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " "));
for (i = 0; i < optlen && i < 10; i++)
ND_PRINT((ndo, "%02x", tp[i]));
ND_PRINT((ndo, "...)"));
break;
case DH6OPT_RECONF_MSG:
- tp = (u_char *)(dh6o + 1);
+ if (optlen != 1) {
+ ND_PRINT((ndo, " ?)"));
+ break;
+ }
+ tp = (const u_char *)(dh6o + 1);
switch (*tp) {
case DH6_RENEW:
ND_PRINT((ndo, " for renew)"));
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
for (i = 0; i < optlen; i += 16)
ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[i])));
ND_PRINT((ndo, ")"));
break;
case DH6OPT_SIP_SERVER_D:
case DH6OPT_DOMAIN_LIST:
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
while (tp < cp + sizeof(*dh6o) + optlen) {
ND_PRINT((ndo, " "));
if ((tp = ns_nprint(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %s)", dhcp6stcode(EXTRACT_16BITS(&tp[0]))));
break;
case DH6OPT_IA_NA:
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " IAID:%u T1:%u T2:%u",
EXTRACT_32BITS(&tp[0]),
EXTRACT_32BITS(&tp[4]),
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " IAID:%u", EXTRACT_32BITS(tp)));
if (optlen > 4) {
/* there are sub-options */
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %s/%d", ip6addr_string(ndo, &tp[9]), tp[8]));
ND_PRINT((ndo, " pltime:%u vltime:%u",
EXTRACT_32BITS(&tp[0]),
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %d)", EXTRACT_32BITS(tp)));
break;
case DH6OPT_REMOTE_ID:
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %d ", EXTRACT_32BITS(tp)));
/*
* Print hex dump first 10 characters.
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
switch (*tp) {
case 1:
ND_PRINT((ndo, " by-address"));
ND_PRINT((ndo, ")"));
break;
case DH6OPT_CLIENT_DATA:
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
if (optlen > 0) {
/* there are encapsulated options */
dhcp6opt_print(ndo, tp, tp + optlen);
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %s ", ip6addr_string(ndo, &tp[0])));
/*
* Print hex dump first 10 characters.
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
while (tp < cp + sizeof(*dh6o) + optlen - 4) {
subopt_code = EXTRACT_16BITS(tp);
tp += 2;
ND_PRINT((ndo, " ?)"));
break;
}
- tp = (u_char *)(dh6o + 1);
+ tp = (const u_char *)(dh6o + 1);
remain_len = optlen;
ND_PRINT((ndo, " "));
/* Encoding is described in section 3.1 of RFC 1035 */
while (remain_len && *tp) {
label_len = *tp++;
if (label_len < remain_len - 1) {
- ND_PRINT((ndo, "%.*s", label_len, tp));
+ (void)fn_printn(ndo, tp, label_len, NULL);
tp += label_len;
remain_len -= (label_len + 1);
if(*tp) ND_PRINT((ndo, "."));
}
ND_PRINT((ndo, ")"));
break;
+ case DH6OPT_NEW_POSIX_TIMEZONE: /* all three of these options */
+ case DH6OPT_NEW_TZDB_TIMEZONE: /* are encoded similarly */
+ case DH6OPT_MUDURL: /* although GMT might not work */
+ if (optlen < 5) {
+ ND_PRINT((ndo, " ?)"));
+ break;
+ }
+ tp = (const u_char *)(dh6o + 1);
+ ND_PRINT((ndo, "="));
+ (void)fn_printn(ndo, tp, (u_int)optlen, NULL);
+ ND_PRINT((ndo, ")"));
+ break;
+
default:
ND_PRINT((ndo, ")"));
break;
dhcp6_print(netdissect_options *ndo,
const u_char *cp, u_int length)
{
- struct dhcp6 *dh6;
- struct dhcp6_relay *dh6relay;
+ const struct dhcp6 *dh6;
+ const struct dhcp6_relay *dh6relay;
const u_char *ep;
- u_char *extp;
+ const u_char *extp;
const char *name;
ND_PRINT((ndo, "dhcp6"));
- ep = (u_char *)ndo->ndo_snapend;
+ ep = (const u_char *)ndo->ndo_snapend;
if (cp + length < ep)
ep = cp + length;
- dh6 = (struct dhcp6 *)cp;
- dh6relay = (struct dhcp6_relay *)cp;
+ dh6 = (const struct dhcp6 *)cp;
+ dh6relay = (const struct dhcp6_relay *)cp;
ND_TCHECK(dh6->dh6_xid);
name = tok2str(dh6_msgtype_str, "msgtype-%u", dh6->dh6_msgtype);
if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
dh6->dh6_msgtype != DH6_RELAY_REPLY) {
ND_PRINT((ndo, "xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK));
- extp = (u_char *)(dh6 + 1);
+ extp = (const u_char *)(dh6 + 1);
dhcp6opt_print(ndo, extp, ep);
} else { /* relay messages */
struct in6_addr addr6;
memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6));
ND_PRINT((ndo, " peeraddr=%s", ip6addr_string(ndo, &addr6)));
- dhcp6opt_print(ndo, (u_char *)(dh6relay + 1), ep);
+ dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep);
}
/*(*/
ND_PRINT((ndo, ")"));
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