122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/*
|
|
* tcp_packet.c
|
|
*
|
|
* $Id: tcp_packet.c,v 1.1.1.1 1999/10/27 09:54:38 fukusima Exp $
|
|
*
|
|
* Copyright (C) 1998, 1999 Masaki Fukushima
|
|
*/
|
|
|
|
#include "ruby_pcap.h"
|
|
#include <limits.h>
|
|
|
|
#define TCP_HDR(pkt) ((struct tcphdr *)LAYER4_HDR(pkt))
|
|
#define TCP_DATA(pkt) ((u_char *)LAYER5_HDR(pkt))
|
|
#define TCP_DATALEN(pkt) (ntohs(IP_HDR(pkt)->ip_len) - \
|
|
(IP_HDR(pkt)->ip_hl + TCP_HDR(pkt)->th_off) * 4)
|
|
|
|
VALUE cTCPPacket;
|
|
|
|
#define CheckTruncateTcp(pkt, need) \
|
|
CheckTruncate(pkt, pkt->hdr.layer4_off, need, "truncated TCP")
|
|
|
|
VALUE
|
|
setup_tcp_packet(pkt, tl_len)
|
|
struct packet_object *pkt;
|
|
int tl_len;
|
|
{
|
|
VALUE class;
|
|
|
|
DEBUG_PRINT("setup_tcp_packet");
|
|
|
|
class = cTCPPacket;
|
|
if (tl_len > 20) {
|
|
int hl = TCP_HDR(pkt)->th_off * 4;
|
|
int layer5_len = tl_len - hl;
|
|
if (layer5_len > 0) {
|
|
pkt->hdr.layer5_off = pkt->hdr.layer4_off + hl;
|
|
/* upper layer */
|
|
}
|
|
}
|
|
return class;
|
|
}
|
|
|
|
#define TCPP_METHOD(func, need, val) \
|
|
static VALUE\
|
|
(func)(self)\
|
|
VALUE self;\
|
|
{\
|
|
struct packet_object *pkt;\
|
|
struct tcphdr *tcp;\
|
|
DEBUG_PRINT(#func);\
|
|
GetPacket(self, pkt);\
|
|
CheckTruncateTcp(pkt, (need));\
|
|
tcp = TCP_HDR(pkt);\
|
|
return (val);\
|
|
}
|
|
|
|
TCPP_METHOD(tcpp_sport, 2, INT2FIX(ntohs(tcp->th_sport)))
|
|
TCPP_METHOD(tcpp_dport, 4, INT2FIX(ntohs(tcp->th_dport)))
|
|
TCPP_METHOD(tcpp_seq, 8, UINT32_2_NUM(ntohl(tcp->th_seq)))
|
|
TCPP_METHOD(tcpp_acknum, 12, UINT32_2_NUM(ntohl(tcp->th_ack)))
|
|
TCPP_METHOD(tcpp_off, 13, INT2FIX(tcp->th_off))
|
|
TCPP_METHOD(tcpp_flags, 14, INT2FIX(tcp->th_flags))
|
|
TCPP_METHOD(tcpp_win, 16, INT2FIX(ntohs(tcp->th_win)))
|
|
TCPP_METHOD(tcpp_sum, 18, INT2FIX(ntohs(tcp->th_sum)))
|
|
TCPP_METHOD(tcpp_urp, 20, INT2FIX(ntohs(tcp->th_urp)))
|
|
|
|
#define TCPP_FLAG(func, flag) \
|
|
TCPP_METHOD(func, 14, (tcp->th_flags & flag) ? Qtrue : Qfalse)
|
|
TCPP_FLAG(tcpp_fin, TH_FIN)
|
|
TCPP_FLAG(tcpp_syn, TH_SYN)
|
|
TCPP_FLAG(tcpp_rst, TH_RST)
|
|
TCPP_FLAG(tcpp_psh, TH_PUSH)
|
|
TCPP_FLAG(tcpp_ack, TH_ACK)
|
|
TCPP_FLAG(tcpp_urg, TH_URG)
|
|
|
|
static VALUE
|
|
tcpp_data(self)
|
|
VALUE self;
|
|
{
|
|
struct packet_object *pkt;
|
|
VALUE v_len;
|
|
int len;
|
|
|
|
DEBUG_PRINT("tcpp_data");
|
|
GetPacket(self, pkt);
|
|
|
|
if (pkt->hdr.layer5_off == OFF_NONEXIST) return Qnil;
|
|
|
|
len = MIN(Caplen(pkt, pkt->hdr.layer5_off), TCP_DATALEN(pkt));
|
|
if (len < 1) return Qnil;
|
|
return rb_str_new(TCP_DATA(pkt), len);
|
|
}
|
|
|
|
void
|
|
Init_tcp_packet(void)
|
|
{
|
|
DEBUG_PRINT("Init_tcp_packet");
|
|
|
|
/* define class TcpPacket */
|
|
cTCPPacket = rb_define_class_under(mPcap, "TCPPacket", cIPPacket);
|
|
|
|
rb_define_method(cTCPPacket, "tcp_sport", tcpp_sport, 0);
|
|
rb_define_method(cTCPPacket, "sport", tcpp_sport, 0);
|
|
rb_define_method(cTCPPacket, "tcp_dport", tcpp_dport, 0);
|
|
rb_define_method(cTCPPacket, "dport", tcpp_dport, 0);
|
|
rb_define_method(cTCPPacket, "tcp_seq", tcpp_seq, 0);
|
|
rb_define_method(cTCPPacket, "tcp_ack", tcpp_acknum, 0);
|
|
rb_define_method(cTCPPacket, "tcp_off", tcpp_off, 0);
|
|
rb_define_method(cTCPPacket, "tcp_hlen", tcpp_off, 0);
|
|
rb_define_method(cTCPPacket, "tcp_flags", tcpp_flags, 0);
|
|
rb_define_method(cTCPPacket, "tcp_win", tcpp_win, 0);
|
|
rb_define_method(cTCPPacket, "tcp_sum", tcpp_sum, 0);
|
|
rb_define_method(cTCPPacket, "tcp_urp", tcpp_urp, 0);
|
|
rb_define_method(cTCPPacket, "tcp_fin?", tcpp_fin, 0);
|
|
rb_define_method(cTCPPacket, "tcp_syn?", tcpp_syn, 0);
|
|
rb_define_method(cTCPPacket, "tcp_rst?", tcpp_rst, 0);
|
|
rb_define_method(cTCPPacket, "tcp_psh?", tcpp_psh, 0);
|
|
rb_define_method(cTCPPacket, "tcp_ack?", tcpp_ack, 0);
|
|
rb_define_method(cTCPPacket, "tcp_urg?", tcpp_urg, 0);
|
|
rb_define_method(cTCPPacket, "tcp_data", tcpp_data, 0);
|
|
}
|