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https://github.com/the-tcpdump-group/tcpdump.git
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decode dhcp6 relay message. from jinmei@kame
This commit is contained in:
itojun
parent
0e956cfb6b
commit
96d5cdd506
197
print-dhcp6.c
197
print-dhcp6.c
@ -27,12 +27,12 @@
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* SUCH DAMAGE.
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*/
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/*
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* draft-ietf-dhc-dhcpv6-26.txt
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* draft-ietf-dhc-dhcpv6-28.txt
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.24 2002-12-11 22:29:21 guy Exp $";
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"@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.25 2003-07-16 16:15:53 itojun Exp $";
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#endif
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#ifdef HAVE_CONFIG_H
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@ -66,7 +66,10 @@ static const char rcsid[] =
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#define DH6_RENEW 5
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#define DH6_REBIND 6
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#define DH6_REPLY 7
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#define DH6_RELEASE 8
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#define DH6_INFORM_REQ 11
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#define DH6_RELAY_FORW 12
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#define DH6_RELAY_REPLY 13
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/* DHCP6 base packet format */
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struct dhcp6 {
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@ -80,10 +83,19 @@ struct dhcp6 {
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#define dh6_xid dh6_msgtypexid.x
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#define DH6_XIDMASK 0x00ffffff
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/* option */
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/* DHCPv6 relay messages */
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struct dhcp6_relay {
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u_int8_t dh6relay_msgtype;
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u_int8_t dh6relay_hcnt;
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u_int8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */
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u_int8_t dh6relay_peeraddr[16];
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/* options follow */
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};
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/* options */
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#define DH6OPT_CLIENTID 1
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#define DH6OPT_SERVERID 2
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#define DH6OPT_IA 3
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#define DH6OPT_IA_NA 3
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#define DH6OPT_IA_TMP 4
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#define DH6OPT_IADDR 5
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#define DH6OPT_ORO 6
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@ -91,20 +103,18 @@ struct dhcp6 {
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# define DH6OPT_PREF_UNDEF -1
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# define DH6OPT_PREF_MAX 255
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#define DH6OPT_ELAPSED_TIME 8
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#define DH6OPT_CLIENT_MSG 9
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#define DH6OPT_SERVER_MSG 10
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#define DH6OPT_RELAY_MSG 9
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/*#define DH6OPT_SERVER_MSG 10 deprecated */
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#define DH6OPT_AUTH 11
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#define DH6OPT_UNICAST 12
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#define DH6OPT_STATUS_CODE 13
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# define DH6OPT_STCODE_SUCCESS 0
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# define DH6OPT_STCODE_UNSPECFAIL 1
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# define DH6OPT_STCODE_AUTHFAILED 2
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# define DH6OPT_STCODE_ADDRUNAVAIL 3
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# define DH6OPT_STCODE_NOADDRAVAIL 4
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# define DH6OPT_STCODE_NOBINDING 5
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# define DH6OPT_STCODE_CONFNOMATCH 6
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# define DH6OPT_STCODE_NOTONLINK 7
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# define DH6OPT_STCODE_USEMULTICAST 8
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# define DH6OPT_STCODE_NOADDRAVAIL 2
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# define DH6OPT_STCODE_NOBINDING 3
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# define DH6OPT_STCODE_NOTONLINK 4
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# define DH6OPT_STCODE_USEMULTICAST 5
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# define DH6OPT_STCODE_NOPREFIXAVAIL 6
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#define DH6OPT_RAPID_COMMIT 14
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#define DH6OPT_USER_CLASS 15
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#define DH6OPT_VENDOR_CLASS 16
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@ -124,12 +134,36 @@ struct dhcp6 {
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#define DH6OPT_PREFIX_INFORMATION 31
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#define DH6OPT_PREFIX_REQUEST 32
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/*
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* The followings are also unassigned numbers.
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* We temporarily use values as of KAME snap 20030106.
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*/
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#define DH6OPT_IA_PD 33
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#define DH6OPT_IA_PD_PREFIX 34
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struct dhcp6opt {
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u_int16_t dh6opt_type;
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u_int16_t dh6opt_len;
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/* type-dependent data follows */
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};
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struct dhcp6_ia {
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u_int16_t dh6opt_ia_type;
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u_int16_t dh6opt_ia_len;
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u_int32_t dh6opt_ia_iaid;
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u_int32_t dh6opt_ia_t1;
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u_int32_t dh6opt_ia_t2;
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};
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struct dhcp6_ia_prefix {
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u_int16_t dh6opt_ia_prefix_type;
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u_int16_t dh6opt_ia_prefix_len;
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u_int32_t dh6opt_ia_prefix_pltime;
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u_int32_t dh6opt_ia_prefix_vltime;
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u_int8_t dh6opt_ia_prefix_plen;
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struct in6_addr dh6opt_ia_prefix_addr;
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} __attribute__ ((__packed__));
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static const char *
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dhcp6opt_name(int type)
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{
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@ -143,20 +177,32 @@ dhcp6opt_name(int type)
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return "client ID";
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case DH6OPT_SERVERID:
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return "server ID";
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case DH6OPT_IA_NA:
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return "IA_NA";
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case DH6OPT_ORO:
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return "option request";
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case DH6OPT_PREFERENCE:
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return "preference";
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case DH6OPT_ELAPSED_TIME:
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return "elapsed time";
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case DH6OPT_RELAY_MSG:
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return "relay message";
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case DH6OPT_STATUS_CODE:
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return "status code";
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case DH6OPT_RAPID_COMMIT:
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return "rapid commit";
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case DH6OPT_INTERFACE_ID:
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return "interface ID";
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case DH6OPT_DNS:
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return "DNS";
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case DH6OPT_PREFIX_DELEGATION:
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return "prefix delegation";
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case DH6OPT_PREFIX_INFORMATION:
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return "prefix information";
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case DH6OPT_IA_PD:
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return "IA_PD";
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case DH6OPT_IA_PD_PREFIX:
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return "IA_PD prefix";
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default:
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sprintf(genstr, "opt_%d", type);
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return(genstr);
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@ -176,20 +222,16 @@ dhcp6stcode(int code)
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return "success";
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case DH6OPT_STCODE_UNSPECFAIL:
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return "unspec failure";
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case DH6OPT_STCODE_AUTHFAILED:
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return "auth fail";
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case DH6OPT_STCODE_ADDRUNAVAIL:
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return "address unavailable";
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case DH6OPT_STCODE_NOADDRAVAIL:
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return "no addresses";
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case DH6OPT_STCODE_NOBINDING:
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return "no binding";
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case DH6OPT_STCODE_CONFNOMATCH:
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return "confirm no match";
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case DH6OPT_STCODE_NOTONLINK:
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return "not on-link";
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case DH6OPT_STCODE_USEMULTICAST:
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return "use multicast";
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case DH6OPT_STCODE_NOPREFIXAVAIL:
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return "no prefixes";
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default:
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sprintf(genstr, "code%d", code);
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return(genstr);
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@ -197,7 +239,7 @@ dhcp6stcode(int code)
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}
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static void
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dhcp6opt_print(u_char *cp, u_char *ep)
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dhcp6opt_print(const u_char *cp, const u_char *ep)
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{
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struct dhcp6opt *dh6o;
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u_char *tp;
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@ -207,6 +249,8 @@ dhcp6opt_print(u_char *cp, u_char *ep)
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u_int16_t val16;
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u_int32_t val32;
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struct in6_addr addr6;
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struct dhcp6_ia ia;
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struct dhcp6_ia_prefix ia_prefix;
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if (cp == ep)
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return;
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@ -294,9 +338,31 @@ dhcp6opt_print(u_char *cp, u_char *ep)
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}
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printf(" %d)", *((u_char *)(dh6o + 1) + 1));
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break;
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case DH6OPT_ELAPSED_TIME:
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if (optlen != 2) {
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printf(" ?)");
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break;
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}
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memcpy(&val16, dh6o + 1, sizeof(val16));
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val16 = ntohs(val16);
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printf(" %d)", (int)val16);
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break;
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case DH6OPT_RELAY_MSG:
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printf(" (");
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dhcp6_print((const u_char *)(dh6o + 1), optlen, 0, 0);
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printf(")");
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break;
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case DH6OPT_RAPID_COMMIT: /* nothing todo */
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printf(")");
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break;
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case DH6OPT_INTERFACE_ID:
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/*
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* Since we cannot predict the encoding, print hex dump
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* at most 10 characters.
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*/
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for (i = 0; i < optlen && i < 10; i++)
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printf("%02x", ((u_char *)(dh6o + 1))[i]);
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break;
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case DH6OPT_DNS:
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if (optlen % 16) {
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printf(" ?)");
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@ -327,12 +393,59 @@ dhcp6opt_print(u_char *cp, u_char *ep)
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printf(" lease-duration: %u)", val32);
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break;
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case DH6OPT_STATUS_CODE:
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if (optlen < 2)
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if (optlen < 2) {
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printf(" ?)");
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break;
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}
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memcpy(&val16, (u_char *)(dh6o + 1), sizeof(val16));
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val16 = ntohs(val16);
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printf(" %s)", dhcp6stcode(val16));
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break;
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case DH6OPT_IA_NA:
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case DH6OPT_IA_PD:
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if (optlen < sizeof(ia) - 4) {
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printf(" ?)");
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break;
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}
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memcpy(&ia, (u_char *)dh6o, sizeof(ia));
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ia.dh6opt_ia_iaid = ntohl(ia.dh6opt_ia_iaid);
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ia.dh6opt_ia_t1 = ntohl(ia.dh6opt_ia_t1);
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ia.dh6opt_ia_t2 = ntohl(ia.dh6opt_ia_t2);
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printf(" IAID:%lu T1:%lu T2:%lu",
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(unsigned long)ia.dh6opt_ia_iaid,
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(unsigned long)ia.dh6opt_ia_t1,
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(unsigned long)ia.dh6opt_ia_t2);
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if (optlen > sizeof(ia) - 4) {
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/* there are sub-options */
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dhcp6opt_print((u_char *)dh6o + sizeof(ia),
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(u_char *)(dh6o + 1) + optlen);
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}
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printf(")");
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break;
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case DH6OPT_IA_PD_PREFIX:
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if (optlen < sizeof(ia_prefix) - 4) {
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printf(" ?)");
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break;
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}
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memcpy(&ia_prefix, (u_char *)dh6o, sizeof(ia_prefix));
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printf(" %s/%d",
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ip6addr_string(&ia_prefix.dh6opt_ia_prefix_addr),
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ia_prefix.dh6opt_ia_prefix_plen);
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ia_prefix.dh6opt_ia_prefix_pltime =
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ntohl(ia_prefix.dh6opt_ia_prefix_pltime);
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ia_prefix.dh6opt_ia_prefix_vltime =
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ntohl(ia_prefix.dh6opt_ia_prefix_vltime);
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printf(" pltime:%lu vltime:%lu",
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(unsigned long)ia_prefix.dh6opt_ia_prefix_pltime,
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(unsigned long)ia_prefix.dh6opt_ia_prefix_vltime);
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if (optlen > sizeof(ia_prefix) - 4) {
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/* there are sub-options */
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dhcp6opt_print((u_char *)dh6o +
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sizeof(ia_prefix),
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(u_char *)(dh6o + 1) + optlen);
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}
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printf(")");
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break;
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default:
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printf(")");
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break;
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@ -350,19 +463,23 @@ trunc:
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* Print dhcp6 packets
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*/
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void
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dhcp6_print(register const u_char *cp, u_int length,
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dhcp6_print(const u_char *cp, u_int length,
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u_int16_t sport, u_int16_t dport)
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{
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struct dhcp6 *dh6;
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u_char *ep;
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struct dhcp6_relay *dh6relay;
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const u_char *ep;
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u_char *extp;
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const char *name;
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printf("dhcp6");
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ep = (u_char *)snapend;
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if (cp + length < ep)
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ep = cp + length;
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dh6 = (struct dhcp6 *)cp;
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dh6relay = (struct dhcp6_relay *)cp;
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TCHECK(dh6->dh6_xid);
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switch (dh6->dh6_msgtype) {
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case DH6_SOLICIT:
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@ -386,9 +503,18 @@ dhcp6_print(register const u_char *cp, u_int length,
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case DH6_REPLY:
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name = "reply";
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break;
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case DH6_RELEASE:
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name = "release";
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break;
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case DH6_INFORM_REQ:
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name= "inf-req";
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break;
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case DH6_RELAY_FORW:
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name= "relay-fwd";
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break;
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case DH6_RELAY_REPLY:
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name= "relay-reply";
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break;
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default:
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name = NULL;
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break;
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@ -397,8 +523,10 @@ dhcp6_print(register const u_char *cp, u_int length,
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if (!vflag) {
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if (name)
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printf(" %s", name);
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else
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else if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
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dh6->dh6_msgtype != DH6_RELAY_REPLY) {
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printf(" msgtype-%u", dh6->dh6_msgtype);
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}
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return;
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}
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@ -408,9 +536,24 @@ dhcp6_print(register const u_char *cp, u_int length,
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printf(" %s (", name); /*)*/
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else
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printf(" msgtype-%u (", dh6->dh6_msgtype); /*)*/
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printf("xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK);
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extp = (u_char *)(dh6 + 1);
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dhcp6opt_print(extp, ep);
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if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
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dh6->dh6_msgtype != DH6_RELAY_REPLY) {
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printf("xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK);
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extp = (u_char *)(dh6 + 1);
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dhcp6opt_print(extp, ep);
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} else { /* relay messages */
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struct in6_addr addr6;
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TCHECK(dh6relay->dh6relay_peeraddr);
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memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6));
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printf("linkaddr=%s", ip6addr_string(&addr6));
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memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6));
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printf(" peeraddr=%s", ip6addr_string(&addr6));
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dhcp6opt_print((u_char *)(dh6relay + 1), ep);
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}
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/*(*/
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printf(")");
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return;
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