X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/ed85e20e4d6a27d5405f37366dd34b64c10a9211..febd0bc5aa33b3de9b5864e8c5565fe7b63f519f:/print-tcp.c diff --git a/print-tcp.c b/print-tcp.c index 5b1133a6..c9b50fee 100644 --- a/print-tcp.c +++ b/print-tcp.c @@ -23,40 +23,37 @@ * 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 -#define NETDISSECT_REWORKED #ifdef HAVE_CONFIG_H #include "config.h" #endif -#include +#include #include #include -#include "interface.h" +#include "netdissect.h" #include "addrtoname.h" #include "extract.h" #include "tcp.h" #include "ip.h" -#ifdef INET6 #include "ip6.h" -#endif #include "ipproto.h" #include "rpc_auth.h" #include "rpc_msg.h" -#include "nameser.h" - #ifdef HAVE_LIBCRYPTO #include -#include +#include "signature.h" static int tcp_verify_signature(netdissect_options *ndo, const struct ip *ip, const struct tcphdr *tp, @@ -64,6 +61,8 @@ static int tcp_verify_signature(netdissect_options *ndo, #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 @@ -81,7 +80,6 @@ struct tcp_seq_hash { tcp_seq ack; }; -#ifdef INET6 struct tha6 { struct in6_addr src; struct in6_addr dst; @@ -94,7 +92,6 @@ struct tcp_seq_hash6 { tcp_seq seq; tcp_seq ack; }; -#endif #define TSEQ_HASHSIZE 919 @@ -102,9 +99,7 @@ struct tcp_seq_hash6 { #define ZEROLENOPT(o) ((o) == TCPOPT_EOL || (o) == TCPOPT_NOP) static struct tcp_seq_hash tcp_seq_hash4[TSEQ_HASHSIZE]; -#ifdef INET6 static struct tcp_seq_hash6 tcp_seq_hash6[TSEQ_HASHSIZE]; -#endif static const struct tok tcp_flag_values[] = { { TH_FIN, "F" }, @@ -132,9 +127,11 @@ static const struct tok tcp_option_values[] = { { TCPOPT_CCNEW, "ccnew" }, { TCPOPT_CCECHO, "" }, { TCPOPT_SIGNATURE, "md5" }, - { TCPOPT_AUTH, "enhanced auth" }, + { TCPOPT_SCPS, "scps" }, { TCPOPT_UTO, "uto" }, + { TCPOPT_TCPAO, "tcp-ao" }, { TCPOPT_MPTCP, "mptcp" }, + { TCPOPT_FASTOPEN, "tfo" }, { TCPOPT_EXPERIMENT2, "exp" }, { 0, NULL } }; @@ -149,6 +146,16 @@ tcp_cksum(netdissect_options *ndo, 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, @@ -164,18 +171,14 @@ tcp_print(netdissect_options *ndo, u_int utoval; uint16_t magic; register int rev; -#ifdef INET6 register const struct ip6_hdr *ip6; -#endif - tp = (struct tcphdr *)bp; - ip = (struct ip *)bp2; -#ifdef INET6 + tp = (const struct tcphdr *)bp; + ip = (const struct ip *)bp2; if (IP_V(ip) == 6) - ip6 = (struct ip6_hdr *)bp2; + ip6 = (const struct ip6_hdr *)bp2; else ip6 = NULL; -#endif /*INET6*/ ch = '\0'; if (!ND_TTEST(tp->th_dport)) { ND_PRINT((ndo, "%s > %s: [|tcp]", @@ -187,43 +190,40 @@ tcp_print(netdissect_options *ndo, sport = EXTRACT_16BITS(&tp->th_sport); dport = EXTRACT_16BITS(&tp->th_dport); - hlen = TH_OFF(tp) * 4; - -#ifdef INET6 if (ip6) { if (ip6->ip6_nxt == IPPROTO_TCP) { ND_PRINT((ndo, "%s.%s > %s.%s: ", ip6addr_string(ndo, &ip6->ip6_src), - tcpport_string(sport), + tcpport_string(ndo, sport), ip6addr_string(ndo, &ip6->ip6_dst), - tcpport_string(dport))); + tcpport_string(ndo, dport))); } else { ND_PRINT((ndo, "%s > %s: ", - tcpport_string(sport), tcpport_string(dport))); + tcpport_string(ndo, sport), tcpport_string(ndo, dport))); } - } else -#endif /*INET6*/ - { + } else { if (ip->ip_p == IPPROTO_TCP) { ND_PRINT((ndo, "%s.%s > %s.%s: ", ipaddr_string(ndo, &ip->ip_src), - tcpport_string(sport), + tcpport_string(ndo, sport), ipaddr_string(ndo, &ip->ip_dst), - tcpport_string(dport))); + tcpport_string(ndo, dport))); } else { ND_PRINT((ndo, "%s > %s: ", - tcpport_string(sport), tcpport_string(dport))); + 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; } - ND_TCHECK(*tp); - seq = EXTRACT_32BITS(&tp->th_seq); ack = EXTRACT_32BITS(&tp->th_ack); win = EXTRACT_16BITS(&tp->th_win); @@ -249,16 +249,15 @@ tcp_print(netdissect_options *ndo, * both directions). */ rev = 0; -#ifdef INET6 if (ip6) { register struct tcp_seq_hash6 *th; struct tcp_seq_hash6 *tcp_seq_hash; - const struct in6_addr *src, *dst; + const void *src, *dst; struct tha6 tha; tcp_seq_hash = tcp_seq_hash6; - src = &ip6->ip6_src; - dst = &ip6->ip6_dst; + src = (const void *)&ip6->ip6_src; + dst = (const void *)&ip6->ip6_dst; if (sport > dport) rev = 1; else if (sport == dport) { @@ -287,7 +286,8 @@ tcp_print(netdissect_options *ndo, th->nxt = (struct tcp_seq_hash6 *) calloc(1, sizeof(*th)); if (th->nxt == NULL) - error("tcp_print: calloc"); + (*ndo->ndo_error)(ndo, + "tcp_print: calloc"); } th->addr = tha; if (rev) @@ -304,30 +304,24 @@ tcp_print(netdissect_options *ndo, thseq = th->seq; thack = th->ack; } else { -#else /*INET6*/ - { -#endif /*INET6*/ register struct tcp_seq_hash *th; struct tcp_seq_hash *tcp_seq_hash; - const struct in_addr *src, *dst; struct tha tha; tcp_seq_hash = tcp_seq_hash4; - src = &ip->ip_src; - dst = &ip->ip_dst; if (sport > dport) rev = 1; else if (sport == dport) { - if (UNALIGNED_MEMCMP(src, dst, sizeof ip->ip_dst) > 0) + if (UNALIGNED_MEMCMP(&ip->ip_src, &ip->ip_dst, sizeof ip->ip_dst) > 0) rev = 1; } if (rev) { - UNALIGNED_MEMCPY(&tha.src, dst, sizeof ip->ip_dst); - UNALIGNED_MEMCPY(&tha.dst, src, sizeof ip->ip_src); + 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, dst, sizeof ip->ip_dst); - UNALIGNED_MEMCPY(&tha.src, src, sizeof ip->ip_src); + 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; } @@ -343,7 +337,8 @@ tcp_print(netdissect_options *ndo, th->nxt = (struct tcp_seq_hash *) calloc(1, sizeof(*th)); if (th->nxt == NULL) - error("tcp_print: calloc"); + (*ndo->ndo_error)(ndo, + "tcp_print: calloc"); } th->addr = tha; if (rev) @@ -386,12 +381,9 @@ tcp_print(netdissect_options *ndo, else ND_PRINT((ndo, " (correct)")); } - } -#ifdef INET6 - else if (IP_V(ip) == 6 && ip6->ip6_plen) { + } else if (IP_V(ip) == 6 && ip6->ip6_plen) { if (ND_TTEST2(tp->th_sport, length)) { - sum = nextproto6_cksum(ip6, (const uint8_t *)tp, - length, length, IPPROTO_TCP); + sum = tcp6_cksum(ndo, ip6, tp, length); tcp_sum = EXTRACT_16BITS(&tp->th_sum); ND_PRINT((ndo, ", cksum 0x%04x", tcp_sum)); @@ -403,7 +395,6 @@ tcp_print(netdissect_options *ndo, } } -#endif } length -= hlen; @@ -474,7 +465,7 @@ tcp_print(netdissect_options *ndo, case TCPOPT_SACK: datalen = len - 2; if (datalen % 8 != 0) { - ND_PRINT((ndo, "malformed sack")); + ND_PRINT((ndo, " invalid sack")); } else { uint32_t s, e; @@ -522,6 +513,7 @@ tcp_print(netdissect_options *ndo, 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)) { @@ -546,15 +538,35 @@ tcp_print(netdissect_options *ndo, #endif break; - case TCPOPT_AUTH: - ND_PRINT((ndo, "keyid %d", *cp++)); - datalen = len - 3; - for (i = 0; i < datalen; ++i) { - LENCHECK(i); - ND_PRINT((ndo, "%02x", cp[i])); - } + 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: @@ -569,7 +581,7 @@ tcp_print(netdissect_options *ndo, datalen = 2; LENCHECK(datalen); utoval = EXTRACT_16BITS(cp); - ND_PRINT((ndo, "0x%x", utoval)); + ND_PRINT((ndo, " 0x%x", utoval)); if (utoval & 0x0001) utoval = (utoval >> 1) * 60; else @@ -584,6 +596,13 @@ tcp_print(netdissect_options *ndo, 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); @@ -595,21 +614,8 @@ tcp_print(netdissect_options *ndo, switch(magic) { - case 0xf989: - /* TCP Fast Open: draft-ietf-tcpm-fastopen-04 */ - if (datalen == 2) { - /* Fast Open Cookie Request */ - ND_PRINT((ndo, "tfo cookiereq")); - } else { - /* Fast Open Cookie */ - if (datalen % 2 != 0 || datalen < 6 || datalen > 18) { - ND_PRINT((ndo, "tfo malformed")); - } else { - ND_PRINT((ndo, "tfo cookie ")); - for (i = 2; i < datalen; ++i) - ND_PRINT((ndo, "%02x", cp[i])); - } - } + case 0xf989: /* TCP Fast Open RFC 7413 */ + print_tcp_fastopen_option(ndo, cp + 2, datalen - 2, TRUE); break; default: @@ -624,7 +630,7 @@ tcp_print(netdissect_options *ndo, if (datalen) ND_PRINT((ndo, " 0x")); for (i = 0; i < datalen; ++i) { - LENCHECK(i); + LENCHECK(i + 1); ND_PRINT((ndo, "%02x", cp[i])); } break; @@ -669,45 +675,59 @@ tcp_print(netdissect_options *ndo, case PT_ZMTP1: zmtp1_print(ndo, bp, length); break; + case PT_RESP: + resp_print(ndo, bp, length); + break; } return; } - if (sport == TELNET_PORT || dport == TELNET_PORT) { - if (!ndo->ndo_qflag && ndo->ndo_vflag) - telnet_print(ndo, bp, length); - } else if (sport == BGP_PORT || dport == BGP_PORT) + 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 (sport == PPTP_PORT || dport == PPTP_PORT) + else if (IS_SRC_OR_DST_PORT(PPTP_PORT)) pptp_print(ndo, bp); -#ifdef TCPDUMP_DO_SMB - else if (sport == NETBIOS_SSN_PORT || dport == NETBIOS_SSN_PORT) + 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 (sport == SMB_PORT || dport == SMB_PORT) + else if (IS_SRC_OR_DST_PORT(SMB_PORT)) smb_tcp_print(ndo, bp, length); #endif - else if (sport == BEEP_PORT || dport == BEEP_PORT) + else if (IS_SRC_OR_DST_PORT(BEEP_PORT)) beep_print(ndo, bp, length); - else if (sport == OPENFLOW_PORT_OLD || dport == OPENFLOW_PORT_OLD || - sport == OPENFLOW_PORT_IANA || dport == OPENFLOW_PORT_IANA) + 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 (length > 2 && - (sport == NAMESERVER_PORT || dport == NAMESERVER_PORT || - sport == MULTICASTDNS_PORT || dport == MULTICASTDNS_PORT)) { + 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 (sport == MSDP_PORT || dport == MSDP_PORT) { + } else if (IS_SRC_OR_DST_PORT(MSDP_PORT)) { msdp_print(ndo, bp, length); - } else if (sport == RPKI_RTR_PORT || dport == RPKI_RTR_PORT) { + } else if (IS_SRC_OR_DST_PORT(RPKI_RTR_PORT)) { rpki_rtr_print(ndo, bp, length); } - else if (length > 0 && (sport == LDP_PORT || dport == LDP_PORT)) { + else if (length > 0 && (IS_SRC_OR_DST_PORT(LDP_PORT))) { ldp_print(ndo, bp, length); } - else if ((sport == NFS_PORT || dport == NFS_PORT) && + 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, @@ -716,23 +736,23 @@ tcp_print(netdissect_options *ndo, * to NFS print routines. */ uint32_t fraglen; - register struct sunrpc_msg *rp; + register const struct sunrpc_msg *rp; enum sunrpc_msg_type direction; fraglen = EXTRACT_32BITS(bp) & 0x7FFFFFFF; if (fraglen > (length) - 4) fraglen = (length) - 4; - rp = (struct sunrpc_msg *)(bp + 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, (u_char *)rp, fraglen, (u_char *)ip); + 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, (u_char *)rp, fraglen, (u_char *)ip); + nfsreply_print_noaddr(ndo, (const u_char *)rp, fraglen, (const u_char *)ip); return; } } @@ -777,13 +797,37 @@ print_tcp_rst_data(netdissect_options *ndo, ND_PRINT((ndo, "+")); /* indicate we truncate */ } ND_PRINT((ndo, " ")); - while (length-- && sp <= ndo->ndo_snapend) { + 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 @@ -796,11 +840,9 @@ tcp_verify_signature(netdissect_options *ndo, char zero_proto = 0; MD5_CTX ctx; uint16_t savecsum, tlen; -#ifdef INET6 - struct ip6_hdr *ip6; + const struct ip6_hdr *ip6; uint32_t len32; uint8_t nxt; -#endif if (data + length > ndo->ndo_snapend) { ND_PRINT((ndo, "snaplen too short, ")); @@ -819,33 +861,27 @@ tcp_verify_signature(netdissect_options *ndo, * Step 1: Update MD5 hash with IP pseudo-header. */ if (IP_V(ip) == 4) { - MD5_Update(&ctx, (char *)&ip->ip_src, sizeof(ip->ip_src)); - MD5_Update(&ctx, (char *)&ip->ip_dst, sizeof(ip->ip_dst)); - MD5_Update(&ctx, (char *)&zero_proto, sizeof(zero_proto)); - MD5_Update(&ctx, (char *)&ip->ip_p, sizeof(ip->ip_p)); + 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, (char *)&tlen, sizeof(tlen)); -#ifdef INET6 + MD5_Update(&ctx, (const char *)&tlen, sizeof(tlen)); } else if (IP_V(ip) == 6) { - ip6 = (struct ip6_hdr *)ip; - MD5_Update(&ctx, (char *)&ip6->ip6_src, sizeof(ip6->ip6_src)); - MD5_Update(&ctx, (char *)&ip6->ip6_dst, sizeof(ip6->ip6_dst)); + 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, (char *)&len32, sizeof(len32)); + MD5_Update(&ctx, (const char *)&len32, sizeof(len32)); nxt = 0; - MD5_Update(&ctx, (char *)&nxt, sizeof(nxt)); - MD5_Update(&ctx, (char *)&nxt, sizeof(nxt)); - MD5_Update(&ctx, (char *)&nxt, sizeof(nxt)); + 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, (char *)&nxt, sizeof(nxt)); -#endif + MD5_Update(&ctx, (const char *)&nxt, sizeof(nxt)); } else { -#ifdef INET6 ND_PRINT((ndo, "IP version not 4 or 6, ")); -#else - ND_PRINT((ndo, "IP version not 4, ")); -#endif return (CANT_CHECK_SIGNATURE); } @@ -855,7 +891,7 @@ tcp_verify_signature(netdissect_options *ndo, */ savecsum = tp1.th_sum; tp1.th_sum = 0; - MD5_Update(&ctx, (char *)&tp1, sizeof(struct tcphdr)); + MD5_Update(&ctx, (const char *)&tp1, sizeof(struct tcphdr)); tp1.th_sum = savecsum; /* * Step 3: Update MD5 hash with TCP segment data, if present.