X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/7b50febe28e54e076a9917164eeddec4bc7a170e..b92f17aa078a0b8d11d9d05d3f8e58c56b8d9bd5:/print-tcp.c diff --git a/print-tcp.c b/print-tcp.c index 3b0202fc..cd1299d9 100644 --- a/print-tcp.c +++ b/print-tcp.c @@ -21,7 +21,7 @@ #ifndef lint static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.73 2000-09-23 08:26:38 guy Exp $ (LBL)"; + "@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.95 2001-12-10 08:21:24 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H @@ -34,9 +34,6 @@ static const char rcsid[] = #include #include -#include -#include -#include #include #include @@ -44,59 +41,23 @@ static const char rcsid[] = #include #include -#ifdef INET6 -#include -#endif - #include "interface.h" #include "addrtoname.h" #include "extract.h" #include "tcp.h" +#include "ip.h" +#ifdef INET6 +#include "ip6.h" +#endif + +#include "nameser.h" + static void print_tcp_rst_data(register const u_char *sp, u_int length); #define MAX_RST_DATA_LEN 30 -/* Compatibility */ -#ifndef TCPOPT_WSCALE -#define TCPOPT_WSCALE 3 /* window scale factor (rfc1072) */ -#endif -#ifndef TCPOPT_SACKOK -#define TCPOPT_SACKOK 4 /* selective ack ok (rfc1072) */ -#endif -#ifndef TCPOPT_SACK -#define TCPOPT_SACK 5 /* selective ack (rfc1072) */ -#endif -#ifndef TCPOPT_ECHO -#define TCPOPT_ECHO 6 /* echo (rfc1072) */ -#endif -#ifndef TCPOPT_ECHOREPLY -#define TCPOPT_ECHOREPLY 7 /* echo (rfc1072) */ -#endif -#ifndef TCPOPT_TIMESTAMP -#define TCPOPT_TIMESTAMP 8 /* timestamps (rfc1323) */ -#endif -#ifndef TCPOPT_CC -#define TCPOPT_CC 11 /* T/TCP CC options (rfc1644) */ -#endif -#ifndef TCPOPT_CCNEW -#define TCPOPT_CCNEW 12 /* T/TCP CC options (rfc1644) */ -#endif -#ifndef TCPOPT_CCECHO -#define TCPOPT_CCECHO 13 /* T/TCP CC options (rfc1644) */ -#endif - -/* - * Definitions required for ECN - * for use if the OS running tcpdump does not have ECN - */ -#ifndef TH_ECNECHO -#define TH_ECNECHO 0x40 /* ECN Echo in tcp header */ -#endif -#ifndef TH_CWR -#define TH_CWR 0x80 /* ECN Cwnd Reduced in tcp header*/ -#endif struct tha { #ifndef INET6 @@ -131,15 +92,19 @@ static struct tcp_seq_hash tcp_seq_hash[TSEQ_HASHSIZE]; #define BGP_PORT 179 #endif #define NETBIOS_SSN_PORT 139 +#ifndef PPTP_PORT +#define PPTP_PORT 1723 +#endif +#define BEEP_PORT 10288 #ifndef NFS_PORT #define NFS_PORT 2049 #endif +#define MSDP_PORT 639 static int tcp_cksum(register const struct ip *ip, register const struct tcphdr *tp, register int len) { - int i, tlen; union phu { struct phdr { u_int32_t src; @@ -150,34 +115,18 @@ static int tcp_cksum(register const struct ip *ip, } ph; u_int16_t pa[6]; } phu; - register const u_int16_t *sp; - u_int32_t sum; - tlen = ntohs(ip->ip_len) - ((const char *)tp-(const char*)ip); + const u_int16_t *sp; /* pseudo-header.. */ - phu.ph.len = htons(tlen); + phu.ph.len = htons(len); /* XXX */ phu.ph.mbz = 0; phu.ph.proto = IPPROTO_TCP; memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t)); memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t)); sp = &phu.pa[0]; - sum = sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]; - - sp = (const u_int16_t *)tp; - - for (i=0; i<(tlen&~1); i+= 2) - sum += *sp++; - - if (tlen & 1) { - sum += htons( (*(const char *)sp) << 8); - } - - while (sum > 0xffff) - sum = (sum & 0xffff) + (sum >> 16); - sum = ~sum & 0xffff; - - return (sum); + return in_cksum((u_short *)tp, len, + sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]); } #ifdef INET6 @@ -218,7 +167,7 @@ static int tcp6_cksum(const struct ip6_hdr *ip6, const struct tcphdr *tp, sum += *sp++; if (tlen & 1) - sum += htons((*(const char *)sp) << 8); + sum += htons((*(const u_int8_t *)sp) << 8); while (sum > 0xffff) sum = (sum & 0xffff) + (sum >> 16); @@ -230,7 +179,7 @@ static int tcp6_cksum(const struct ip6_hdr *ip6, const struct tcphdr *tp, void tcp_print(register const u_char *bp, register u_int length, - register const u_char *bp2) + register const u_char *bp2, int fragmented) { register const struct tcphdr *tp; register const struct ip *ip; @@ -247,7 +196,7 @@ tcp_print(register const u_char *bp, register u_int length, tp = (struct tcphdr *)bp; ip = (struct ip *)bp2; #ifdef INET6 - if (ip->ip_v == 6) + if (IP_V(ip) == 6) ip6 = (struct ip6_hdr *)bp2; else ip6 = NULL; @@ -263,8 +212,7 @@ tcp_print(register const u_char *bp, register u_int length, sport = ntohs(tp->th_sport); dport = ntohs(tp->th_dport); - - hlen = tp->th_off * 4; + hlen = TH_OFF(tp) * 4; /* * If data present and NFS port used, assume NFS. @@ -274,13 +222,13 @@ tcp_print(register const u_char *bp, register u_int length, if (!qflag) { if ((u_char *)tp + 4 + sizeof(struct rpc_msg) <= snapend && dport == NFS_PORT) { - nfsreq_print((u_char *)tp + hlen + 4, length-hlen, + nfsreq_print((u_char *)tp + hlen + 4, length - hlen, (u_char *)ip); return; } else if ((u_char *)tp + 4 + sizeof(struct rpc_msg) <= snapend && sport == NFS_PORT) { - nfsreply_print((u_char *)tp + hlen + 4,length-hlen, + nfsreply_print((u_char *)tp + hlen + 4, length - hlen, (u_char *)ip); return; } @@ -320,7 +268,7 @@ tcp_print(register const u_char *bp, register u_int length, urp = ntohs(tp->th_urp); if (qflag) { - (void)printf("tcp %d", length - tp->th_off * 4); + (void)printf("tcp %d", length - TH_OFF(tp) * 4); return; } if ((flags = tp->th_flags) & (TH_SYN|TH_FIN|TH_RST|TH_PUSH| @@ -354,18 +302,18 @@ tcp_print(register const u_char *bp, register u_int length, memset(&tha, 0, sizeof(tha)); rev = 0; if (ip6) { - if (sport > dport) { + if (sport > dport) rev = 1; - } else if (sport == dport) { - int i; - - for (i = 0; i < 4; i++) { - if (((u_int32_t *)(&ip6->ip6_src))[i] > - ((u_int32_t *)(&ip6->ip6_dst))[i]) { - rev = 1; - break; + else if (sport == dport) { + int i; + + for (i = 0; i < 4; i++) { + if (((u_int32_t *)(&ip6->ip6_src))[i] > + ((u_int32_t *)(&ip6->ip6_dst))[i]) { + rev = 1; + break; + } } - } } if (rev) { tha.src = ip6->ip6_dst; @@ -426,7 +374,6 @@ tcp_print(register const u_char *bp, register u_int length, th->ack = seq, th->seq = ack - 1; else th->seq = seq, th->ack = ack - 1; - } else { if (rev) seq -= th->ack, ack -= th->seq; @@ -445,7 +392,7 @@ tcp_print(register const u_char *bp, register u_int length, return; } - if (ip->ip_v == 4 && vflag) { + if (IP_V(ip) == 4 && vflag && !fragmented) { int sum; if (TTEST2(tp->th_sport, length)) { sum = tcp_cksum(ip, tp, length); @@ -456,7 +403,7 @@ tcp_print(register const u_char *bp, register u_int length, } } #ifdef INET6 - if (ip->ip_v == 6 && ip6->ip6_plen && vflag) { + if (IP_V(ip) == 6 && ip6->ip6_plen && vflag && !fragmented) { int sum; if (TTEST2(tp->th_sport, length)) { sum = tcp6_cksum(ip6, tp, length); @@ -470,7 +417,7 @@ tcp_print(register const u_char *bp, register u_int length, length -= hlen; if (vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST)) - (void)printf(" %u:%u(%d)", seq, seq + length, length); + (void)printf(" %u:%u(%u)", seq, seq + length, length); if (flags & TH_ACK) (void)printf(" ack %u", ack); @@ -640,7 +587,7 @@ tcp_print(register const u_char *bp, register u_int length, /* * Decode payload if necessary. */ - bp += (tp->th_off * 4); + bp += TH_OFF(tp) * 4; if (flags & TH_RST) { if (vflag) print_tcp_rst_data(bp, length); @@ -650,8 +597,24 @@ tcp_print(register const u_char *bp, register u_int length, telnet_print(bp, length); } else if (sport == BGP_PORT || dport == BGP_PORT) bgp_print(bp, length); + else if (sport == PPTP_PORT || dport == PPTP_PORT) + pptp_print(bp, length); +#ifdef TCPDUMP_DO_SMB else if (sport == NETBIOS_SSN_PORT || dport == NETBIOS_SSN_PORT) nbt_tcp_print(bp, length); +#endif + else if (sport == BEEP_PORT || dport == BEEP_PORT) + beep_print(bp, length); + else if (length > 2 && + (sport == NAMESERVER_PORT || dport == NAMESERVER_PORT)) { + /* + * TCP DNS query has 2byte length at the head. + * XXX packet could be unaligned, it can go strange + */ + ns_print(bp + 2, length - 2); + } else if (sport == MSDP_PORT || dport == MSDP_PORT) { + msdp_print(bp, length); + } } return; bad: @@ -696,10 +659,7 @@ print_tcp_rst_data(register const u_char *sp, u_int length) putchar(' '); while (length-- && sp <= snapend) { c = *sp++; - if (isprint(c)) - putchar(c); - else - putchar('.'); + safeputchar(c); } putchar(']'); }