| /* $NetBSD: print-tcp.c,v 1.9 2007/07/26 18:15:12 plunky Exp $ */ |
| |
| /* |
| * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Copyright (c) 1999-2004 The tcpdump.org project |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| */ |
| |
| /* \summary: TCP printer */ |
| |
| #ifndef lint |
| #else |
| __RCSID("$NetBSD: print-tcp.c,v 1.8 2007/07/24 11:53:48 drochner Exp $"); |
| #endif |
| |
| #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" |
| |
| #include "tcp.h" |
| |
| #include "ip.h" |
| #include "ip6.h" |
| #include "ipproto.h" |
| #include "rpc_auth.h" |
| #include "rpc_msg.h" |
| |
| #ifdef HAVE_LIBCRYPTO |
| #include <openssl/md5.h> |
| #include "signature.h" |
| |
| static int tcp_verify_signature(netdissect_options *ndo, |
| const struct ip *ip, const struct tcphdr *tp, |
| const u_char *data, int length, const u_char *rcvsig); |
| #endif |
| |
| static void print_tcp_rst_data(netdissect_options *, register const u_char *sp, u_int length); |
| static void print_tcp_fastopen_option(netdissect_options *ndo, register const u_char *cp, |
| u_int datalen, int exp); |
| |
| #define MAX_RST_DATA_LEN 30 |
| |
| |
| struct tha { |
| struct in_addr src; |
| struct in_addr dst; |
| u_int port; |
| }; |
| |
| struct tcp_seq_hash { |
| struct tcp_seq_hash *nxt; |
| struct tha addr; |
| tcp_seq seq; |
| tcp_seq ack; |
| }; |
| |
| struct tha6 { |
| struct in6_addr src; |
| struct in6_addr dst; |
| u_int port; |
| }; |
| |
| struct tcp_seq_hash6 { |
| struct tcp_seq_hash6 *nxt; |
| struct tha6 addr; |
| tcp_seq seq; |
| tcp_seq ack; |
| }; |
| |
| #define TSEQ_HASHSIZE 919 |
| |
| /* These tcp optinos do not have the size octet */ |
| #define ZEROLENOPT(o) ((o) == TCPOPT_EOL || (o) == TCPOPT_NOP) |
| |
| static struct tcp_seq_hash tcp_seq_hash4[TSEQ_HASHSIZE]; |
| static struct tcp_seq_hash6 tcp_seq_hash6[TSEQ_HASHSIZE]; |
| |
| static const struct tok tcp_flag_values[] = { |
| { TH_FIN, "F" }, |
| { TH_SYN, "S" }, |
| { TH_RST, "R" }, |
| { TH_PUSH, "P" }, |
| { TH_ACK, "." }, |
| { TH_URG, "U" }, |
| { TH_ECNECHO, "E" }, |
| { TH_CWR, "W" }, |
| { 0, NULL } |
| }; |
| |
| static const struct tok tcp_option_values[] = { |
| { TCPOPT_EOL, "eol" }, |
| { TCPOPT_NOP, "nop" }, |
| { TCPOPT_MAXSEG, "mss" }, |
| { TCPOPT_WSCALE, "wscale" }, |
| { TCPOPT_SACKOK, "sackOK" }, |
| { TCPOPT_SACK, "sack" }, |
| { TCPOPT_ECHO, "echo" }, |
| { TCPOPT_ECHOREPLY, "echoreply" }, |
| { TCPOPT_TIMESTAMP, "TS" }, |
| { TCPOPT_CC, "cc" }, |
| { TCPOPT_CCNEW, "ccnew" }, |
| { TCPOPT_CCECHO, "" }, |
| { TCPOPT_SIGNATURE, "md5" }, |
| { TCPOPT_SCPS, "scps" }, |
| { TCPOPT_UTO, "uto" }, |
| { TCPOPT_TCPAO, "tcp-ao" }, |
| { TCPOPT_MPTCP, "mptcp" }, |
| { TCPOPT_FASTOPEN, "tfo" }, |
| { TCPOPT_EXPERIMENT2, "exp" }, |
| { 0, NULL } |
| }; |
| |
| static int |
| tcp_cksum(netdissect_options *ndo, |
| register const struct ip *ip, |
| register const struct tcphdr *tp, |
| register u_int len) |
| { |
| return nextproto4_cksum(ndo, ip, (const uint8_t *)tp, len, len, |
| IPPROTO_TCP); |
| } |
| |
| static int |
| tcp6_cksum(netdissect_options *ndo, |
| register const struct ip6_hdr *ip6, |
| register const struct tcphdr *tp, |
| register u_int len) |
| { |
| return nextproto6_cksum(ndo, ip6, (const uint8_t *)tp, len, len, |
| IPPROTO_TCP); |
| } |
| |
| void |
| tcp_print(netdissect_options *ndo, |
| register const u_char *bp, register u_int length, |
| register const u_char *bp2, int fragmented) |
| { |
| register const struct tcphdr *tp; |
| register const struct ip *ip; |
| register u_char flags; |
| register u_int hlen; |
| register char ch; |
| uint16_t sport, dport, win, urp; |
| uint32_t seq, ack, thseq, thack; |
| u_int utoval; |
| uint16_t magic; |
| register int rev; |
| register const struct ip6_hdr *ip6; |
| |
| tp = (const struct tcphdr *)bp; |
| ip = (const struct ip *)bp2; |
| if (IP_V(ip) == 6) |
| ip6 = (const struct ip6_hdr *)bp2; |
| else |
| ip6 = NULL; |
| ch = '\0'; |
| if (!ND_TTEST(tp->th_dport)) { |
| ND_PRINT((ndo, "%s > %s: [|tcp]", |
| ipaddr_string(ndo, &ip->ip_src), |
| ipaddr_string(ndo, &ip->ip_dst))); |
| return; |
| } |
| |
| sport = EXTRACT_16BITS(&tp->th_sport); |
| dport = EXTRACT_16BITS(&tp->th_dport); |
| |
| if (ip6) { |
| if (ip6->ip6_nxt == IPPROTO_TCP) { |
| ND_PRINT((ndo, "%s.%s > %s.%s: ", |
| ip6addr_string(ndo, &ip6->ip6_src), |
| tcpport_string(ndo, sport), |
| ip6addr_string(ndo, &ip6->ip6_dst), |
| tcpport_string(ndo, dport))); |
| } else { |
| ND_PRINT((ndo, "%s > %s: ", |
| tcpport_string(ndo, sport), tcpport_string(ndo, dport))); |
| } |
| } else { |
| if (ip->ip_p == IPPROTO_TCP) { |
| ND_PRINT((ndo, "%s.%s > %s.%s: ", |
| ipaddr_string(ndo, &ip->ip_src), |
| tcpport_string(ndo, sport), |
| ipaddr_string(ndo, &ip->ip_dst), |
| tcpport_string(ndo, dport))); |
| } else { |
| ND_PRINT((ndo, "%s > %s: ", |
| tcpport_string(ndo, sport), tcpport_string(ndo, dport))); |
| } |
| } |
| |
| ND_TCHECK(*tp); |
| |
| hlen = TH_OFF(tp) * 4; |
| |
| if (hlen < sizeof(*tp)) { |
| ND_PRINT((ndo, " tcp %d [bad hdr length %u - too short, < %lu]", |
| length - hlen, hlen, (unsigned long)sizeof(*tp))); |
| return; |
| } |
| |
| 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 (ndo->ndo_qflag) { |
| ND_PRINT((ndo, "tcp %d", length - hlen)); |
| if (hlen > length) { |
| ND_PRINT((ndo, " [bad hdr length %u - too long, > %u]", |
| hlen, length)); |
| } |
| return; |
| } |
| |
| flags = tp->th_flags; |
| ND_PRINT((ndo, "Flags [%s]", bittok2str_nosep(tcp_flag_values, "none", flags))); |
| |
| if (!ndo->ndo_Sflag && (flags & TH_ACK)) { |
| /* |
| * 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). |
| */ |
| rev = 0; |
| if (ip6) { |
| register struct tcp_seq_hash6 *th; |
| struct tcp_seq_hash6 *tcp_seq_hash; |
| const struct in6_addr *src, *dst; |
| struct tha6 tha; |
| |
| tcp_seq_hash = tcp_seq_hash6; |
| src = &ip6->ip6_src; |
| dst = &ip6->ip6_dst; |
| if (sport > dport) |
| rev = 1; |
| else if (sport == dport) { |
| if (UNALIGNED_MEMCMP(src, dst, sizeof ip6->ip6_dst) > 0) |
| rev = 1; |
| } |
| if (rev) { |
| UNALIGNED_MEMCPY(&tha.src, dst, sizeof ip6->ip6_dst); |
| UNALIGNED_MEMCPY(&tha.dst, src, sizeof ip6->ip6_src); |
| tha.port = dport << 16 | sport; |
| } else { |
| UNALIGNED_MEMCPY(&tha.dst, dst, sizeof ip6->ip6_dst); |
| UNALIGNED_MEMCPY(&tha.src, src, sizeof ip6->ip6_src); |
| tha.port = sport << 16 | dport; |
| } |
| |
| 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_hash6 *) |
| calloc(1, sizeof(*th)); |
| if (th->nxt == NULL) |
| (*ndo->ndo_error)(ndo, |
| "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 { |
| register struct tcp_seq_hash *th; |
| struct tcp_seq_hash *tcp_seq_hash; |
| struct tha tha; |
| |
| tcp_seq_hash = tcp_seq_hash4; |
| if (sport > dport) |
| rev = 1; |
| else if (sport == dport) { |
| if (UNALIGNED_MEMCMP(&ip->ip_src, &ip->ip_dst, sizeof ip->ip_dst) > 0) |
| rev = 1; |
| } |
| if (rev) { |
| UNALIGNED_MEMCPY(&tha.src, &ip->ip_dst, sizeof ip->ip_dst); |
| UNALIGNED_MEMCPY(&tha.dst, &ip->ip_src, sizeof ip->ip_src); |
| tha.port = dport << 16 | sport; |
| } else { |
| UNALIGNED_MEMCPY(&tha.dst, &ip->ip_dst, sizeof ip->ip_dst); |
| UNALIGNED_MEMCPY(&tha.src, &ip->ip_src, sizeof ip->ip_src); |
| tha.port = sport << 16 | dport; |
| } |
| |
| 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) |
| (*ndo->ndo_error)(ndo, |
| "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 = rev = 0; |
| } |
| if (hlen > length) { |
| ND_PRINT((ndo, " [bad hdr length %u - too long, > %u]", |
| hlen, length)); |
| return; |
| } |
| |
| if (ndo->ndo_vflag && !ndo->ndo_Kflag && !fragmented) { |
| /* Check the checksum, if possible. */ |
| uint16_t sum, tcp_sum; |
| |
| if (IP_V(ip) == 4) { |
| if (ND_TTEST2(tp->th_sport, length)) { |
| sum = tcp_cksum(ndo, ip, tp, length); |
| tcp_sum = EXTRACT_16BITS(&tp->th_sum); |
| |
| ND_PRINT((ndo, ", cksum 0x%04x", tcp_sum)); |
| if (sum != 0) |
| ND_PRINT((ndo, " (incorrect -> 0x%04x)", |
| in_cksum_shouldbe(tcp_sum, sum))); |
| else |
| ND_PRINT((ndo, " (correct)")); |
| } |
| } else if (IP_V(ip) == 6 && ip6->ip6_plen) { |
| if (ND_TTEST2(tp->th_sport, length)) { |
| sum = tcp6_cksum(ndo, ip6, tp, length); |
| tcp_sum = EXTRACT_16BITS(&tp->th_sum); |
| |
| ND_PRINT((ndo, ", cksum 0x%04x", tcp_sum)); |
| if (sum != 0) |
| ND_PRINT((ndo, " (incorrect -> 0x%04x)", |
| in_cksum_shouldbe(tcp_sum, sum))); |
| else |
| ND_PRINT((ndo, " (correct)")); |
| |
| } |
| } |
| } |
| |
| length -= hlen; |
| if (ndo->ndo_vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST)) { |
| ND_PRINT((ndo, ", seq %u", seq)); |
| |
| if (length > 0) { |
| ND_PRINT((ndo, ":%u", seq + length)); |
| } |
| } |
| |
| if (flags & TH_ACK) { |
| ND_PRINT((ndo, ", ack %u", ack)); |
| } |
| |
| ND_PRINT((ndo, ", win %d", win)); |
| |
| if (flags & TH_URG) |
| ND_PRINT((ndo, ", 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); |
| ND_PRINT((ndo, ", options [")); |
| while (hlen > 0) { |
| if (ch != '\0') |
| ND_PRINT((ndo, "%c", ch)); |
| ND_TCHECK(*cp); |
| opt = *cp++; |
| if (ZEROLENOPT(opt)) |
| len = 1; |
| else { |
| ND_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; |
| |
| /* Bail if "l" bytes of data are not left or were not captured */ |
| #define LENCHECK(l) { if ((l) > hlen) goto bad; ND_TCHECK2(*cp, l); } |
| |
| |
| ND_PRINT((ndo, "%s", tok2str(tcp_option_values, "unknown-%u", opt))); |
| |
| switch (opt) { |
| |
| case TCPOPT_MAXSEG: |
| datalen = 2; |
| LENCHECK(datalen); |
| ND_PRINT((ndo, " %u", EXTRACT_16BITS(cp))); |
| break; |
| |
| case TCPOPT_WSCALE: |
| datalen = 1; |
| LENCHECK(datalen); |
| ND_PRINT((ndo, " %u", *cp)); |
| break; |
| |
| case TCPOPT_SACK: |
| datalen = len - 2; |
| if (datalen % 8 != 0) { |
| ND_PRINT((ndo, " invalid sack")); |
| } else { |
| uint32_t s, e; |
| |
| ND_PRINT((ndo, " %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 (rev) { |
| s -= thseq; |
| e -= thseq; |
| } else { |
| s -= thack; |
| e -= thack; |
| } |
| ND_PRINT((ndo, "{%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); |
| ND_PRINT((ndo, " %u", EXTRACT_32BITS(cp))); |
| break; |
| |
| case TCPOPT_TIMESTAMP: |
| datalen = 8; |
| LENCHECK(datalen); |
| ND_PRINT((ndo, " val %u ecr %u", |
| EXTRACT_32BITS(cp), |
| EXTRACT_32BITS(cp + 4))); |
| break; |
| |
| case TCPOPT_SIGNATURE: |
| datalen = TCP_SIGLEN; |
| LENCHECK(datalen); |
| ND_PRINT((ndo, " ")); |
| #ifdef HAVE_LIBCRYPTO |
| switch (tcp_verify_signature(ndo, ip, tp, |
| bp + TH_OFF(tp) * 4, length, cp)) { |
| |
| case SIGNATURE_VALID: |
| ND_PRINT((ndo, "valid")); |
| break; |
| |
| case SIGNATURE_INVALID: |
| ND_PRINT((ndo, "invalid")); |
| break; |
| |
| case CANT_CHECK_SIGNATURE: |
| ND_PRINT((ndo, "can't check - ")); |
| for (i = 0; i < TCP_SIGLEN; ++i) |
| ND_PRINT((ndo, "%02x", cp[i])); |
| break; |
| } |
| #else |
| for (i = 0; i < TCP_SIGLEN; ++i) |
| ND_PRINT((ndo, "%02x", cp[i])); |
| #endif |
| break; |
| |
| case TCPOPT_SCPS: |
| datalen = 2; |
| LENCHECK(datalen); |
| ND_PRINT((ndo, " cap %02x id %u", cp[0], cp[1])); |
| break; |
| |
| case TCPOPT_TCPAO: |
| datalen = len - 2; |
| /* RFC 5925 Section 2.2: |
| * "The Length value MUST be greater than or equal to 4." |
| * (This includes the Kind and Length fields already processed |
| * at this point.) |
| */ |
| if (datalen < 2) { |
| ND_PRINT((ndo, " invalid")); |
| } else { |
| LENCHECK(1); |
| ND_PRINT((ndo, " keyid %u", cp[0])); |
| LENCHECK(2); |
| ND_PRINT((ndo, " rnextkeyid %u", cp[1])); |
| if (datalen > 2) { |
| ND_PRINT((ndo, " mac 0x")); |
| for (i = 2; i < datalen; i++) { |
| LENCHECK(i + 1); |
| ND_PRINT((ndo, "%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); |
| ND_PRINT((ndo, " 0x%x", utoval)); |
| if (utoval & 0x0001) |
| utoval = (utoval >> 1) * 60; |
| else |
| utoval >>= 1; |
| ND_PRINT((ndo, " %u", utoval)); |
| break; |
| |
| case TCPOPT_MPTCP: |
| datalen = len - 2; |
| LENCHECK(datalen); |
| if (!mptcp_print(ndo, cp-2, len, flags)) |
| goto bad; |
| break; |
| |
| case TCPOPT_FASTOPEN: |
| datalen = len - 2; |
| LENCHECK(datalen); |
| ND_PRINT((ndo, " ")); |
| print_tcp_fastopen_option(ndo, cp, datalen, FALSE); |
| break; |
| |
| case TCPOPT_EXPERIMENT2: |
| datalen = len - 2; |
| LENCHECK(datalen); |
| if (datalen < 2) |
| goto bad; |
| /* RFC6994 */ |
| magic = EXTRACT_16BITS(cp); |
| ND_PRINT((ndo, "-")); |
| |
| switch(magic) { |
| |
| case 0xf989: /* TCP Fast Open RFC 7413 */ |
| print_tcp_fastopen_option(ndo, cp + 2, datalen - 2, TRUE); |
| break; |
| |
| default: |
| /* Unknown magic number */ |
| ND_PRINT((ndo, "%04x", magic)); |
| break; |
| } |
| break; |
| |
| default: |
| datalen = len - 2; |
| if (datalen) |
| ND_PRINT((ndo, " 0x")); |
| for (i = 0; i < datalen; ++i) { |
| LENCHECK(i + 1); |
| ND_PRINT((ndo, "%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) |
| ND_PRINT((ndo, "[len %d]", len)); |
| ch = ','; |
| if (opt == TCPOPT_EOL) |
| break; |
| } |
| ND_PRINT((ndo, "]")); |
| } |
| |
| /* |
| * Print length field before crawling down the stack. |
| */ |
| ND_PRINT((ndo, ", length %u", length)); |
| |
| if (length <= 0) |
| return; |
| |
| /* |
| * Decode payload if necessary. |
| */ |
| bp += TH_OFF(tp) * 4; |
| if ((flags & TH_RST) && ndo->ndo_vflag) { |
| print_tcp_rst_data(ndo, bp, length); |
| return; |
| } |
| |
| if (ndo->ndo_packettype) { |
| switch (ndo->ndo_packettype) { |
| case PT_ZMTP1: |
| zmtp1_print(ndo, bp, length); |
| break; |
| case PT_RESP: |
| resp_print(ndo, bp, length); |
| break; |
| } |
| return; |
| } |
| |
| if (IS_SRC_OR_DST_PORT(TELNET_PORT)) { |
| telnet_print(ndo, bp, length); |
| } else if (IS_SRC_OR_DST_PORT(SMTP_PORT)) { |
| ND_PRINT((ndo, ": ")); |
| smtp_print(ndo, bp, length); |
| } else if (IS_SRC_OR_DST_PORT(BGP_PORT)) |
| bgp_print(ndo, bp, length); |
| else if (IS_SRC_OR_DST_PORT(PPTP_PORT)) |
| pptp_print(ndo, bp); |
| else if (IS_SRC_OR_DST_PORT(REDIS_PORT)) |
| resp_print(ndo, bp, length); |
| #ifdef ENABLE_SMB |
| else if (IS_SRC_OR_DST_PORT(NETBIOS_SSN_PORT)) |
| nbt_tcp_print(ndo, bp, length); |
| else if (IS_SRC_OR_DST_PORT(SMB_PORT)) |
| smb_tcp_print(ndo, bp, length); |
| #endif |
| else if (IS_SRC_OR_DST_PORT(BEEP_PORT)) |
| beep_print(ndo, bp, length); |
| else if (IS_SRC_OR_DST_PORT(OPENFLOW_PORT_OLD) || IS_SRC_OR_DST_PORT(OPENFLOW_PORT_IANA)) |
| openflow_print(ndo, bp, length); |
| else if (IS_SRC_OR_DST_PORT(FTP_PORT)) { |
| ND_PRINT((ndo, ": ")); |
| ftp_print(ndo, bp, length); |
| } else if (IS_SRC_OR_DST_PORT(HTTP_PORT) || IS_SRC_OR_DST_PORT(HTTP_PORT_ALT)) { |
| ND_PRINT((ndo, ": ")); |
| http_print(ndo, bp, length); |
| } else if (IS_SRC_OR_DST_PORT(RTSP_PORT) || IS_SRC_OR_DST_PORT(RTSP_PORT_ALT)) { |
| ND_PRINT((ndo, ": ")); |
| rtsp_print(ndo, bp, length); |
| } else if (length > 2 && |
| (IS_SRC_OR_DST_PORT(NAMESERVER_PORT))) { |
| /* |
| * TCP DNS query has 2byte length at the head. |
| * XXX packet could be unaligned, it can go strange |
| */ |
| ns_print(ndo, bp + 2, length - 2, 0); |
| } else if (IS_SRC_OR_DST_PORT(MSDP_PORT)) { |
| msdp_print(ndo, bp, length); |
| } else if (IS_SRC_OR_DST_PORT(RPKI_RTR_PORT)) { |
| rpki_rtr_print(ndo, bp, length); |
| } |
| else if (length > 0 && (IS_SRC_OR_DST_PORT(LDP_PORT))) { |
| ldp_print(ndo, bp, length); |
| } |
| else if ((IS_SRC_OR_DST_PORT(NFS_PORT)) && |
| length >= 4 && ND_TTEST2(*bp, 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. |
| */ |
| uint32_t fraglen; |
| register const struct sunrpc_msg *rp; |
| enum sunrpc_msg_type direction; |
| |
| fraglen = EXTRACT_32BITS(bp) & 0x7FFFFFFF; |
| if (fraglen > (length) - 4) |
| fraglen = (length) - 4; |
| rp = (const struct sunrpc_msg *)(bp + 4); |
| if (ND_TTEST(rp->rm_direction)) { |
| direction = (enum sunrpc_msg_type)EXTRACT_32BITS(&rp->rm_direction); |
| if (dport == NFS_PORT && direction == SUNRPC_CALL) { |
| ND_PRINT((ndo, ": NFS request xid %u ", EXTRACT_32BITS(&rp->rm_xid))); |
| nfsreq_print_noaddr(ndo, (const u_char *)rp, fraglen, (const u_char *)ip); |
| return; |
| } |
| if (sport == NFS_PORT && direction == SUNRPC_REPLY) { |
| ND_PRINT((ndo, ": NFS reply xid %u ", EXTRACT_32BITS(&rp->rm_xid))); |
| nfsreply_print_noaddr(ndo, (const u_char *)rp, fraglen, (const u_char *)ip); |
| return; |
| } |
| } |
| } |
| |
| return; |
| bad: |
| ND_PRINT((ndo, "[bad opt]")); |
| if (ch != '\0') |
| ND_PRINT((ndo, ">")); |
| return; |
| trunc: |
| ND_PRINT((ndo, "[|tcp]")); |
| if (ch != '\0') |
| ND_PRINT((ndo, ">")); |
| } |
| |
| /* |
| * RFC1122 says the following on data in RST segments: |
| * |
| * 4.2.2.12 RST Segment: RFC-793 Section 3.4 |
| * |
| * A TCP SHOULD allow a received RST segment to include data. |
| * |
| * DISCUSSION |
| * It has been suggested that a RST segment could contain |
| * ASCII text that encoded and explained the cause of the |
| * RST. No standard has yet been established for such |
| * data. |
| * |
| */ |
| |
| static void |
| print_tcp_rst_data(netdissect_options *ndo, |
| register const u_char *sp, u_int length) |
| { |
| int c; |
| |
| ND_PRINT((ndo, ND_TTEST2(*sp, length) ? " [RST" : " [!RST")); |
| if (length > MAX_RST_DATA_LEN) { |
| length = MAX_RST_DATA_LEN; /* can use -X for longer */ |
| ND_PRINT((ndo, "+")); /* indicate we truncate */ |
| } |
| ND_PRINT((ndo, " ")); |
| while (length-- && sp < ndo->ndo_snapend) { |
| c = *sp++; |
| safeputchar(ndo, c); |
| } |
| ND_PRINT((ndo, "]")); |
| } |
| |
| static void |
| print_tcp_fastopen_option(netdissect_options *ndo, register const u_char *cp, |
| u_int datalen, int exp) |
| { |
| u_int i; |
| |
| if (exp) |
| ND_PRINT((ndo, "tfo")); |
| |
| if (datalen == 0) { |
| /* Fast Open Cookie Request */ |
| ND_PRINT((ndo, " cookiereq")); |
| } else { |
| /* Fast Open Cookie */ |
| if (datalen % 2 != 0 || datalen < 4 || datalen > 16) { |
| ND_PRINT((ndo, " invalid")); |
| } else { |
| ND_PRINT((ndo, " cookie ")); |
| for (i = 0; i < datalen; ++i) |
| ND_PRINT((ndo, "%02x", cp[i])); |
| } |
| } |
| } |
| |
| #ifdef HAVE_LIBCRYPTO |
| USES_APPLE_DEPRECATED_API |
| static int |
| tcp_verify_signature(netdissect_options *ndo, |
| const struct ip *ip, const struct tcphdr *tp, |
| const u_char *data, int length, const u_char *rcvsig) |
| { |
| struct tcphdr tp1; |
| u_char sig[TCP_SIGLEN]; |
| char zero_proto = 0; |
| MD5_CTX ctx; |
| uint16_t savecsum, tlen; |
| const struct ip6_hdr *ip6; |
| uint32_t len32; |
| uint8_t nxt; |
| |
| if (data + length > ndo->ndo_snapend) { |
| ND_PRINT((ndo, "snaplen too short, ")); |
| return (CANT_CHECK_SIGNATURE); |
| } |
| |
| tp1 = *tp; |
| |
| if (ndo->ndo_sigsecret == NULL) { |
| ND_PRINT((ndo, "shared secret not supplied with -M, ")); |
| return (CANT_CHECK_SIGNATURE); |
| } |
| |
| MD5_Init(&ctx); |
| /* |
| * Step 1: Update MD5 hash with IP pseudo-header. |
| */ |
| if (IP_V(ip) == 4) { |
| MD5_Update(&ctx, (const char *)&ip->ip_src, sizeof(ip->ip_src)); |
| MD5_Update(&ctx, (const char *)&ip->ip_dst, sizeof(ip->ip_dst)); |
| MD5_Update(&ctx, (const char *)&zero_proto, sizeof(zero_proto)); |
| MD5_Update(&ctx, (const char *)&ip->ip_p, sizeof(ip->ip_p)); |
| tlen = EXTRACT_16BITS(&ip->ip_len) - IP_HL(ip) * 4; |
| tlen = htons(tlen); |
| MD5_Update(&ctx, (const char *)&tlen, sizeof(tlen)); |
| } else if (IP_V(ip) == 6) { |
| ip6 = (const struct ip6_hdr *)ip; |
| MD5_Update(&ctx, (const char *)&ip6->ip6_src, sizeof(ip6->ip6_src)); |
| MD5_Update(&ctx, (const char *)&ip6->ip6_dst, sizeof(ip6->ip6_dst)); |
| len32 = htonl(EXTRACT_16BITS(&ip6->ip6_plen)); |
| MD5_Update(&ctx, (const char *)&len32, sizeof(len32)); |
| nxt = 0; |
| MD5_Update(&ctx, (const char *)&nxt, sizeof(nxt)); |
| MD5_Update(&ctx, (const char *)&nxt, sizeof(nxt)); |
| MD5_Update(&ctx, (const char *)&nxt, sizeof(nxt)); |
| nxt = IPPROTO_TCP; |
| MD5_Update(&ctx, (const char *)&nxt, sizeof(nxt)); |
| } else { |
| ND_PRINT((ndo, "IP version not 4 or 6, ")); |
| return (CANT_CHECK_SIGNATURE); |
| } |
| |
| /* |
| * Step 2: Update MD5 hash with TCP header, excluding options. |
| * The TCP checksum must be set to zero. |
| */ |
| savecsum = tp1.th_sum; |
| tp1.th_sum = 0; |
| MD5_Update(&ctx, (const char *)&tp1, sizeof(struct tcphdr)); |
| tp1.th_sum = savecsum; |
| /* |
| * Step 3: Update MD5 hash with TCP segment data, if present. |
| */ |
| if (length > 0) |
| MD5_Update(&ctx, data, length); |
| /* |
| * Step 4: Update MD5 hash with shared secret. |
| */ |
| MD5_Update(&ctx, ndo->ndo_sigsecret, strlen(ndo->ndo_sigsecret)); |
| MD5_Final(sig, &ctx); |
| |
| if (memcmp(rcvsig, sig, TCP_SIGLEN) == 0) |
| return (SIGNATURE_VALID); |
| else |
| return (SIGNATURE_INVALID); |
| } |
| USES_APPLE_RST |
| #endif /* HAVE_LIBCRYPTO */ |
| |
| /* |
| * Local Variables: |
| * c-style: whitesmith |
| * c-basic-offset: 8 |
| * End: |
| */ |
