void
krb_print(packetbody_t dat)
{
__capability const struct krb *kp;
kp = (__capability const struct krb *)dat;
if (!PACKET_HAS_ELEMENT(kp, pvno)) {
fputs(tstr, stdout);
return;
}
switch (kp->pvno) {
case 1:
case 2:
case 3:
printf(" v%d", kp->pvno);
break;
case 4:
printf(" v%d", kp->pvno);
krb4_print((packetbody_t)kp);
break;
case 106:
case 107:
fputs(" v5", stdout);
/* Decode ASN.1 here "someday" */
break;
}
return;
}
/*
* Mobility Header
*/
int
mobility_print(packetbody_t bp, packetbody_t bp2 _U_)
{
__capability const struct ip6_mobility *mh;
int mhlen, hlen, type;
mh = (__capability const struct ip6_mobility *)bp;
if (!PACKET_HAS_ELEMENT(mh, ip6m_len)) {
/*
* There's not enough captured data to include the
* mobility header length.
*
* Our caller expects us to return the length, however,
* so return a value that will run to the end of the
* captured data.
*
* XXX - "ip6_print()" doesn't do anything with the
* returned length, however, as it breaks out of the
* header-processing loop.
*/
mhlen = PACKET_REMAINING(bp);
goto trunc;
}
mhlen = (int)((mh->ip6m_len + 1) << 3);
/* XXX ip6m_cksum */
PACKET_HAS_ELEMENT_OR_TRUNC(mh, ip6m_type);
type = mh->ip6m_type;
switch (type) {
case IP6M_BINDING_REQUEST:
printf("mobility: BRR");
hlen = IP6M_MINLEN;
break;
case IP6M_HOME_TEST_INIT:
case IP6M_CAREOF_TEST_INIT:
printf("mobility: %soTI",
type == IP6M_HOME_TEST_INIT ? "H" : "C");
hlen = IP6M_MINLEN;
if (vflag) {
PACKET_HAS_SPACE_OR_TRUNC(mh, hlen + 8);
printf(" %s Init Cookie=%08x:%08x",
type == IP6M_HOME_TEST_INIT ? "Home" : "Care-of",
EXTRACT_32BITS(&bp[hlen]),
EXTRACT_32BITS(&bp[hlen + 4]));
}
hlen += 8;
break;
case IP6M_HOME_TEST:
case IP6M_CAREOF_TEST:
printf("mobility: %soT",
type == IP6M_HOME_TEST ? "H" : "C");
PACKET_HAS_ELEMENT_OR_TRUNC(mh, ip6m_data16[0]);
printf(" nonce id=0x%x", EXTRACT_16BITS(&mh->ip6m_data16[0]));
hlen = IP6M_MINLEN;
if (vflag) {
PACKET_HAS_SPACE_OR_TRUNC(mh, hlen + 8);
printf(" %s Init Cookie=%08x:%08x",
type == IP6M_HOME_TEST ? "Home" : "Care-of",
EXTRACT_32BITS(&bp[hlen]),
EXTRACT_32BITS(&bp[hlen + 4]));
}
hlen += 8;
if (vflag) {
PACKET_HAS_SPACE_OR_TRUNC(mh, hlen + 8);
printf(" %s Keygen Token=%08x:%08x",
type == IP6M_HOME_TEST ? "Home" : "Care-of",
EXTRACT_32BITS(&bp[hlen]),
EXTRACT_32BITS(&bp[hlen + 4]));
}
hlen += 8;
break;
case IP6M_BINDING_UPDATE:
printf("mobility: BU");
PACKET_HAS_ELEMENT_OR_TRUNC(mh, ip6m_data16[0]);
printf(" seq#=%d", EXTRACT_16BITS(&mh->ip6m_data16[0]));
hlen = IP6M_MINLEN;
PACKET_HAS_SPACE_OR_TRUNC(mh, hlen + 1);
if (bp[hlen] & 0xf0)
printf(" ");
if (bp[hlen] & 0x80)
printf("A");
if (bp[hlen] & 0x40)
printf("H");
if (bp[hlen] & 0x20)
printf("L");
if (bp[hlen] & 0x10)
printf("K");
/* Reserved (4bits) */
hlen += 1;
/* Reserved (8bits) */
hlen += 1;
PACKET_HAS_SPACE_OR_TRUNC(mh, hlen + 2);
/* units of 4 secs */
printf(" lifetime=%d", EXTRACT_16BITS(&bp[hlen]) << 2);
hlen += 2;
break;
case IP6M_BINDING_ACK:
printf("mobility: BA");
PACKET_HAS_ELEMENT_OR_TRUNC(mh, ip6m_data8[0]);
printf(" status=%d", mh->ip6m_data8[0]);
if (mh->ip6m_data8[1] & 0x80)
printf(" K");
/* Reserved (7bits) */
hlen = IP6M_MINLEN;
PACKET_HAS_SPACE_OR_TRUNC(mh, hlen + 2);
printf(" seq#=%d", EXTRACT_16BITS(&bp[hlen]));
hlen += 2;
PACKET_HAS_SPACE_OR_TRUNC(mh, hlen + 2);
/* units of 4 secs */
printf(" lifetime=%d", EXTRACT_16BITS(&bp[hlen]) << 2);
hlen += 2;
break;
case IP6M_BINDING_ERROR:
printf("mobility: BE");
PACKET_HAS_ELEMENT_OR_TRUNC(mh, ip6m_data8[0]);
printf(" status=%d", mh->ip6m_data8[0]);
/* Reserved */
hlen = IP6M_MINLEN;
PACKET_HAS_SPACE_OR_TRUNC(mh, hlen + 16);
printf(" homeaddr %s", ip6addr_string(&bp[hlen]));
hlen += 16;
break;
default:
printf("mobility: type-#%d len=%d", type, mh->ip6m_len);
return(mhlen);
break;
}
if (vflag)
mobility_opt_print(&bp[hlen], mhlen - hlen);
return(mhlen);
trunc:
fputs("[|MOBILITY]", stdout);
return(mhlen);
}
static void
krb4_print(packetbody_t cp)
{
__capability const struct krb *kp;
u_char type;
u_short len;
#define PRINT if ((cp = c_print(cp, snapend)) == NULL) goto trunc
/* True if struct krb is little endian */
#define IS_LENDIAN(kp) (((kp)->type & 0x01) != 0)
#define KTOHSP(kp, cp) (IS_LENDIAN(kp) ? EXTRACT_LE_16BITS(cp) : EXTRACT_16BITS(cp))
kp = (__capability const struct krb *)cp;
if (!PACKET_HAS_ELEMENT(kp, type)) {
fputs(tstr, stdout);
return;
}
type = kp->type & (0xFF << 1);
printf(" %s %s: ",
IS_LENDIAN(kp) ? "le" : "be", tok2str(type2str, NULL, type));
switch (type) {
case AUTH_MSG_KDC_REQUEST:
if ((cp = krb4_print_hdr(cp)) == NULL)
return;
cp += 4; /* ctime */
PACKET_HAS_ONE_OR_TRUNC(cp);
printf(" %dmin ", *cp++ * 5);
PRINT;
putchar('.');
PRINT;
break;
case AUTH_MSG_APPL_REQUEST:
cp += 2;
PACKET_HAS_ONE_OR_TRUNC(cp);
printf("v%d ", *cp++);
PRINT;
PACKET_HAS_ONE_OR_TRUNC(cp);
printf(" (%d)", *cp++);
PACKET_HAS_ONE_OR_TRUNC(cp);
printf(" (%d)", *cp);
break;
case AUTH_MSG_KDC_REPLY:
if ((cp = krb4_print_hdr(cp)) == NULL)
return;
cp += 10; /* timestamp + n + exp + kvno */
PACKET_HAS_SPACE_OR_TRUNC(cp, sizeof(short));
len = KTOHSP(kp, cp);
printf(" (%d)", len);
break;
case AUTH_MSG_ERR_REPLY:
if ((cp = krb4_print_hdr(cp)) == NULL)
return;
cp += 4; /* timestamp */
PACKET_HAS_SPACE_OR_TRUNC(cp, sizeof(short));
printf(" %s ", tok2str(kerr2str, NULL, KTOHSP(kp, cp)));
cp += 4;
PRINT;
break;
default:
fputs("(unknown)", stdout);
break;
}
return;
trunc:
fputs(tstr, stdout);
}
void
tcp_print(packetbody_t bp, register u_int length,
packetbody_t bp2, int fragmented)
{
__capability const struct tcphdr *tp;
__capability const struct ip *ip;
register u_char flags;
register u_int hlen;
register char ch;
u_int16_t sport, dport, win, urp;
u_int32_t seq, ack, thseq, thack;
u_int utoval;
int threv;
#ifdef INET6
__capability const struct ip6_hdr *ip6;
#endif
tp = (__capability const struct tcphdr *)bp;
ip = (__capability const struct ip *)bp2;
#ifdef INET6
if (IP_V(ip) == 6)
ip6 = (__capability const struct ip6_hdr *)bp2;
else
ip6 = NULL;
#endif /*INET6*/
ch = '\0';
if (!PACKET_HAS_ELEMENT(tp, th_dport)) {
(void)printf("%s > %s: [|tcp]",
ipaddr_string(&ip->ip_src),
ipaddr_string(&ip->ip_dst));
return;
}
sport = EXTRACT_16BITS(&tp->th_sport);
dport = EXTRACT_16BITS(&tp->th_dport);
hlen = TH_OFF(tp) * 4;
/*
* If data present, header length valid, and NFS port used,
* assume NFS.
* Pass offset of data plus 4 bytes for RPC TCP msg length
* to NFS print routines.
*/
if (!qflag && hlen >= sizeof(*tp) && hlen <= length &&
(length - hlen) >= 4) {
packetbody_t fraglenp;
u_int32_t fraglen;
__capability const struct sunrpc_msg *rp;
enum sunrpc_msg_type direction;
fraglenp = (packetbody_t)tp + hlen;
if (PACKET_HAS_SPACE(fraglenp, 4)) {
fraglen = EXTRACT_32BITS(fraglenp) & 0x7FFFFFFF;
if (fraglen > (length - hlen) - 4)
fraglen = (length - hlen) - 4;
rp = (__capability const struct sunrpc_msg *)(fraglenp + 4);
if (PACKET_HAS_ELEMENT(rp, rm_direction)) {
direction = (enum sunrpc_msg_type)EXTRACT_32BITS(&rp->rm_direction);
if (dport == NFS_PORT &&
direction == SUNRPC_CALL) {
nfsreq_print((packetbody_t)rp, fraglen,
(packetbody_t)ip);
return;
}
if (sport == NFS_PORT &&
direction == SUNRPC_REPLY) {
nfsreply_print((packetbody_t)rp,
fraglen, (packetbody_t)ip);
return;
}
}
}
}
#ifdef INET6
if (ip6) {
if (ip6->ip6_nxt == IPPROTO_TCP) {
(void)printf("%s.%s > %s.%s: ",
ip6addr_string(&ip6->ip6_src),
tcpport_string(sport),
ip6addr_string(&ip6->ip6_dst),
tcpport_string(dport));
} else {
(void)printf("%s > %s: ",
tcpport_string(sport), tcpport_string(dport));
}
} else
#endif /*INET6*/
{
if (ip->ip_p == IPPROTO_TCP) {
(void)printf("%s.%s > %s.%s: ",
ipaddr_string(&ip->ip_src),
tcpport_string(sport),
ipaddr_string(&ip->ip_dst),
tcpport_string(dport));
} else {
(void)printf("%s > %s: ",
tcpport_string(sport), tcpport_string(dport));
}
}
if (hlen < sizeof(*tp)) {
(void)printf(" tcp %d [bad hdr length %u - too short, < %lu]",
length - hlen, hlen, (unsigned long)sizeof(*tp));
return;
}
PACKET_HAS_ONE_OR_TRUNC(tp);
seq = EXTRACT_32BITS(&tp->th_seq);
ack = EXTRACT_32BITS(&tp->th_ack);
win = EXTRACT_16BITS(&tp->th_win);
urp = EXTRACT_16BITS(&tp->th_urp);
if (qflag) {
(void)printf("tcp %d", length - hlen);
if (hlen > length) {
(void)printf(" [bad hdr length %u - too long, > %u]",
hlen, length);
}
return;
}
flags = tp->th_flags;
printf("Flags [%s]", bittok2str_nosep(tcp_flag_values, "none", flags));
if (!Sflag && (flags & TH_ACK)) {
struct tcp_seq_hash *th;
packetbody_t src, dst;
register int rev;
struct tha tha;
/*
* Find (or record) the initial sequence numbers for
* this conversation. (we pick an arbitrary
* collating order so there's only one entry for
* both directions).
*/
#ifdef INET6
rev = 0;
if (ip6) {
src = (packetbody_t)&ip6->ip6_src;
dst = (packetbody_t)&ip6->ip6_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (p_memcmp(src, dst, sizeof ip6->ip6_dst) > 0)
rev = 1;
}
if (rev) {
p_memcpy_from_packet(&tha.src, dst, sizeof ip6->ip6_dst);
p_memcpy_from_packet(&tha.dst, src, sizeof ip6->ip6_src);
tha.port = dport << 16 | sport;
} else {
p_memcpy_from_packet(&tha.dst, dst, sizeof ip6->ip6_dst);
p_memcpy_from_packet(&tha.src, src, sizeof ip6->ip6_src);
tha.port = sport << 16 | dport;
}
} else {
/*
* Zero out the tha structure; the src and dst
* fields are big enough to hold an IPv6
* address, but we only have IPv4 addresses
* and thus must clear out the remaining 124
* bits.
*
* XXX - should we just clear those bytes after
* copying the IPv4 addresses, rather than
* zeroing out the entire structure and then
* overwriting some of the zeroes?
*
* XXX - this could fail if we see TCP packets
* with an IPv6 address with the lower 124 bits
* all zero and also see TCP packes with an
* IPv4 address with the same 32 bits as the
* upper 32 bits of the IPv6 address in question.
* Can that happen? Is it likely enough to be
* an issue?
*/
memset(&tha, 0, sizeof(tha));
src = (packetbody_t)&ip->ip_src;
dst = (packetbody_t)&ip->ip_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (p_memcmp(src, dst, sizeof ip->ip_dst) > 0)
rev = 1;
}
if (rev) {
p_memcpy_from_packet(&tha.src, dst, sizeof ip->ip_dst);
p_memcpy_from_packet(&tha.dst, src, sizeof ip->ip_src);
tha.port = dport << 16 | sport;
} else {
p_memcpy_from_packet(&tha.dst, dst, sizeof ip->ip_dst);
p_memcpy_from_packet(&tha.src, src, sizeof ip->ip_src);
tha.port = sport << 16 | dport;
}
}
#else
rev = 0;
src = &ip->ip_src;
dst = &ip->ip_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
if (p_memcmp(src, dst, sizeof ip->ip_dst) > 0)
rev = 1;
}
if (rev) {
memcpy(&tha.src, dst, sizeof ip->ip_dst);
memcpy(&tha.dst, src, sizeof ip->ip_src);
tha.port = dport << 16 | sport;
} else {
memcpy(&tha.dst, dst, sizeof ip->ip_dst);
memcpy(&tha.src, src, sizeof ip->ip_src);
tha.port = sport << 16 | dport;
}
#endif
threv = rev;
for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
th->nxt; th = th->nxt)
if (memcmp((char *)&tha, (char *)&th->addr,
sizeof(th->addr)) == 0)
break;
if (!th->nxt || (flags & TH_SYN)) {
/* didn't find it or new conversation */
if (th->nxt == NULL) {
th->nxt = (struct tcp_seq_hash *)
calloc(1, sizeof(*th));
if (th->nxt == NULL)
error("tcp_print: calloc");
}
th->addr = tha;
if (rev)
th->ack = seq, th->seq = ack - 1;
else
th->seq = seq, th->ack = ack - 1;
} else {
if (rev)
seq -= th->ack, ack -= th->seq;
else
seq -= th->seq, ack -= th->ack;
}
thseq = th->seq;
thack = th->ack;
} else {
/*fool gcc*/
thseq = thack = threv = 0;
}
if (hlen > length) {
(void)printf(" [bad hdr length %u - too long, > %u]",
hlen, length);
return;
}
if (vflag && !Kflag && !fragmented) {
/* Check the checksum, if possible. */
u_int16_t sum, tcp_sum;
if (IP_V(ip) == 4) {
if (PACKET_HAS_SPACE(tp, length)) {
sum = tcp_cksum(ip, tp, length);
tcp_sum = EXTRACT_16BITS(&tp->th_sum);
(void)printf(", cksum 0x%04x", tcp_sum);
if (sum != 0)
(void)printf(" (incorrect -> 0x%04x)",
in_cksum_shouldbe(tcp_sum, sum));
else
(void)printf(" (correct)");
}
}
#ifdef INET6
else if (IP_V(ip) == 6 && ip6->ip6_plen) {
if (PACKET_HAS_SPACE(tp, length)) {
sum = nextproto6_cksum(ip6, (packetbody_t)tp, length, IPPROTO_TCP);
tcp_sum = EXTRACT_16BITS(&tp->th_sum);
(void)printf(", cksum 0x%04x", tcp_sum);
if (sum != 0)
(void)printf(" (incorrect -> 0x%04x)",
in_cksum_shouldbe(tcp_sum, sum));
else
(void)printf(" (correct)");
}
}
#endif
}
length -= hlen;
if (vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST)) {
(void)printf(", seq %u", seq);
if (length > 0) {
(void)printf(":%u", seq + length);
}
}
if (flags & TH_ACK) {
(void)printf(", ack %u", ack);
}
(void)printf(", win %d", win);
if (flags & TH_URG)
(void)printf(", urg %d", urp);
/*
* Handle any options.
*/
if (hlen > sizeof(*tp)) {
packetbody_t cp;
register u_int i, opt, datalen;
register u_int len;
hlen -= sizeof(*tp);
cp = (packetbody_t)tp + sizeof(*tp);
printf(", options [");
while (hlen > 0) {
if (ch != '\0')
putchar(ch);
PACKET_HAS_ONE_OR_TRUNC(cp);
opt = *cp++;
if (ZEROLENOPT(opt))
len = 1;
else {
PACKET_HAS_ONE_OR_TRUNC(cp);
len = *cp++; /* total including type, len */
if (len < 2 || len > hlen)
goto bad;
--hlen; /* account for length byte */
}
--hlen; /* account for type byte */
datalen = 0;
/* Bail if "l" bytes of data are not left or were not captured */
#define LENCHECK(l) { if ((l) > hlen) goto bad; PACKET_HAS_SPACE_OR_TRUNC(cp, l); }
printf("%s", tok2str(tcp_option_values, "Unknown Option %u", opt));
switch (opt) {
case TCPOPT_MAXSEG:
datalen = 2;
LENCHECK(datalen);
(void)printf(" %u", EXTRACT_16BITS(cp));
break;
case TCPOPT_WSCALE:
datalen = 1;
LENCHECK(datalen);
(void)printf(" %u", *cp);
break;
case TCPOPT_SACK:
datalen = len - 2;
if (datalen % 8 != 0) {
(void)printf("malformed sack");
} else {
u_int32_t s, e;
(void)printf(" %d ", datalen / 8);
for (i = 0; i < datalen; i += 8) {
LENCHECK(i + 4);
s = EXTRACT_32BITS(cp + i);
LENCHECK(i + 8);
e = EXTRACT_32BITS(cp + i + 4);
if (threv) {
s -= thseq;
e -= thseq;
} else {
s -= thack;
e -= thack;
}
(void)printf("{%u:%u}", s, e);
}
}
break;
case TCPOPT_CC:
case TCPOPT_CCNEW:
case TCPOPT_CCECHO:
case TCPOPT_ECHO:
case TCPOPT_ECHOREPLY:
/*
* those options share their semantics.
* fall through
*/
datalen = 4;
LENCHECK(datalen);
(void)printf(" %u", EXTRACT_32BITS(cp));
break;
case TCPOPT_TIMESTAMP:
datalen = 8;
LENCHECK(datalen);
(void)printf(" val %u ecr %u",
EXTRACT_32BITS(cp),
EXTRACT_32BITS(cp + 4));
break;
case TCPOPT_SIGNATURE:
datalen = TCP_SIGLEN;
LENCHECK(datalen);
#ifdef HAVE_LIBCRYPTO
switch (tcp_verify_signature(ip, tp,
bp + TH_OFF(tp) * 4, length, cp)) {
case SIGNATURE_VALID:
(void)printf("valid");
break;
case SIGNATURE_INVALID:
(void)printf("invalid");
break;
case CANT_CHECK_SIGNATURE:
(void)printf("can't check - ");
for (i = 0; i < TCP_SIGLEN; ++i)
(void)printf("%02x", cp[i]);
break;
}
#else
for (i = 0; i < TCP_SIGLEN; ++i)
(void)printf("%02x", cp[i]);
#endif
break;
case TCPOPT_AUTH:
(void)printf("keyid %d", *cp++);
datalen = len - 3;
for (i = 0; i < datalen; ++i) {
LENCHECK(i);
(void)printf("%02x", cp[i]);
}
break;
case TCPOPT_EOL:
case TCPOPT_NOP:
case TCPOPT_SACKOK:
/*
* Nothing interesting.
* fall through
*/
break;
case TCPOPT_UTO:
datalen = 2;
LENCHECK(datalen);
utoval = EXTRACT_16BITS(cp);
(void)printf("0x%x", utoval);
if (utoval & 0x0001)
utoval = (utoval >> 1) * 60;
else
utoval >>= 1;
(void)printf(" %u", utoval);
break;
default:
datalen = len - 2;
for (i = 0; i < datalen; ++i) {
LENCHECK(i);
(void)printf("%02x", cp[i]);
}
break;
}
/* Account for data printed */
cp += datalen;
hlen -= datalen;
/* Check specification against observed length */
++datalen; /* option octet */
if (!ZEROLENOPT(opt))
++datalen; /* size octet */
if (datalen != len)
(void)printf("[len %d]", len);
ch = ',';
if (opt == TCPOPT_EOL)
break;
}
