- register const struct tcphdr *tp;
- register const struct ip *ip;
- register u_char flags;
- register int hlen;
- register char ch;
- u_short sport, dport, win, urp;
- u_int32_t seq, ack;
-
- tp = (struct tcphdr *)bp;
- ip = (struct ip *)bp2;
- ch = '\0';
- TCHECK(*tp);
- if (length < sizeof(*tp)) {
- (void)printf("truncated-tcp %d", length);
- return;
- }
-
- sport = ntohs(tp->th_sport);
- dport = ntohs(tp->th_dport);
- seq = ntohl(tp->th_seq);
- ack = ntohl(tp->th_ack);
- win = ntohs(tp->th_win);
- urp = ntohs(tp->th_urp);
-
- (void)printf("%s.%s > %s.%s: ",
- ipaddr_string(&ip->ip_src), tcpport_string(sport),
- ipaddr_string(&ip->ip_dst), tcpport_string(dport));
-
- if (qflag) {
- (void)printf("tcp %d", length - tp->th_off * 4);
- return;
- }
- if ((flags = tp->th_flags) & (TH_SYN|TH_FIN|TH_RST|TH_PUSH)) {
- if (flags & TH_SYN)
- putchar('S');
- if (flags & TH_FIN)
- putchar('F');
- if (flags & TH_RST)
- putchar('R');
- if (flags & TH_PUSH)
- putchar('P');
- } else
- putchar('.');
-
- if (!Sflag && (flags & TH_ACK)) {
- register struct tcp_seq_hash *th;
- 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).
- */
- if (sport < dport ||
- (sport == dport &&
- ip->ip_src.s_addr < ip->ip_dst.s_addr)) {
- tha.src = ip->ip_src, tha.dst = ip->ip_dst;
- tha.port = sport << 16 | dport;
- rev = 0;
- } else {
- tha.src = ip->ip_dst, tha.dst = ip->ip_src;
- tha.port = dport << 16 | sport;
- rev = 1;
- }
-
- for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
- th->nxt; th = th->nxt)
- if (!memcmp((char *)&tha, (char *)&th->addr,
- sizeof(th->addr)))
- 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;
- }
- }
- hlen = tp->th_off * 4;
- if (hlen > length) {
- (void)printf(" [bad hdr length]");
- return;
- }
- length -= hlen;
- if (length > 0 || flags & (TH_SYN | TH_FIN | TH_RST))
- (void)printf(" %u:%u(%d)", seq, seq + length, 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)) > 0) {
- register const u_char *cp;
- register int i, opt, len, datalen;
-
- cp = (const u_char *)tp + sizeof(*tp);
- putchar(' ');
- ch = '<';
- while (hlen > 0) {
- putchar(ch);
- TCHECK(*cp);
- opt = *cp++;
- if (ZEROLENOPT(opt))
- len = 1;
- else {
- TCHECK(*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;
+ register const struct tcphdr *tp;
+ register 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;
+ int threv;
+#ifdef INET6
+ register const struct ip6_hdr *ip6;
+#endif
+
+ tp = (struct tcphdr *)bp;
+ ip = (struct ip *)bp2;
+#ifdef INET6
+ if (IP_V(ip) == 6)
+ ip6 = (struct ip6_hdr *)bp2;
+ else
+ ip6 = NULL;
+#endif /*INET6*/
+ ch = '\0';
+ if (!TTEST(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) {
+ if ((u_char *)tp + 4 + sizeof(struct sunrpc_msg) <= snapend &&
+ dport == NFS_PORT) {
+ nfsreq_print((u_char *)tp + hlen + 4, length - hlen,
+ (u_char *)ip);
+ return;
+ } else if ((u_char *)tp + 4 + sizeof(struct sunrpc_msg)
+ <= snapend &&
+ sport == NFS_PORT) {
+ nfsreply_print((u_char *)tp + hlen + 4, length - hlen,
+ (u_char *)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;
+ }
+
+ TCHECK(*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)) {
+ register struct tcp_seq_hash *th;
+ const void *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
+ memset(&tha, 0, sizeof(tha));
+ rev = 0;
+ if (ip6) {
+ src = &ip6->ip6_src;
+ dst = &ip6->ip6_dst;
+ if (sport > dport)
+ rev = 1;
+ else if (sport == dport) {
+ if (memcmp(src, dst, sizeof ip6->ip6_dst) > 0)
+ rev = 1;
+ }
+ if (rev) {
+ memcpy(&tha.src, dst, sizeof ip6->ip6_dst);
+ memcpy(&tha.dst, src, sizeof ip6->ip6_src);
+ tha.port = dport << 16 | sport;
+ } else {
+ memcpy(&tha.dst, dst, sizeof ip6->ip6_dst);
+ memcpy(&tha.src, src, sizeof ip6->ip6_src);
+ tha.port = sport << 16 | dport;
+ }
+ } else {
+ src = &ip->ip_src;
+ dst = &ip->ip_dst;
+ if (sport > dport)
+ rev = 1;
+ else if (sport == dport) {
+ if (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;
+ }
+ }
+#else
+ rev = 0;
+ src = &ip->ip_src;
+ dst = &ip->ip_dst;
+ if (sport > dport)
+ rev = 1;
+ else if (sport == dport) {
+ if (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 (IP_V(ip) == 4 && vflag && !Kflag && !fragmented) {
+ u_int16_t sum, tcp_sum;
+ if (TTEST2(tp->th_sport, length)) {
+ sum = tcp_cksum(ip, tp, length);
+
+ (void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum));
+ if (sum != 0) {
+ tcp_sum = EXTRACT_16BITS(&tp->th_sum);
+ (void)printf(" (incorrect -> 0x%04x)",in_cksum_shouldbe(tcp_sum, sum));
+ } else
+ (void)printf(" (correct)");
+ }
+ }
+#ifdef INET6
+ if (IP_V(ip) == 6 && ip6->ip6_plen && vflag && !Kflag && !fragmented) {
+ u_int16_t sum,tcp_sum;
+ if (TTEST2(tp->th_sport, length)) {
+ sum = tcp6_cksum(ip6, tp, length);
+ (void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum));
+ if (sum != 0) {
+ tcp_sum = EXTRACT_16BITS(&tp->th_sum);
+ (void)printf(" (incorrect (-> 0x%04x)",in_cksum_shouldbe(tcp_sum, sum));
+ } else
+ (void)printf(" (correct)");
+
+ }
+ }
+#endif
+
+ length -= hlen;
+ if (vflag > 1 || 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)) {
+ register const u_char *cp;
+ register u_int i, opt, datalen;
+ register u_int len;
+
+ hlen -= sizeof(*tp);
+ cp = (const u_char *)tp + sizeof(*tp);
+ printf(", options [");
+ while (hlen > 0) {
+ if (ch != '\0')
+ putchar(ch);
+ TCHECK(*cp);
+ opt = *cp++;
+ if (ZEROLENOPT(opt))
+ len = 1;
+ else {
+ TCHECK(*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;
projects / tcpdump / blobdiff