mirror of
https://github.com/wangyu-/udp2raw.git
synced 2025-01-31 20:29:36 +08:00
changed ip tcp flag,added tcp options
This commit is contained in:
wangyu
wangyu
parent
d2d45af028
commit
ea67de4548
144
main.cpp
144
main.cpp
@ -52,6 +52,8 @@ const int handshake_timeout=1000;
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const int heartbeat_timeout=10000;
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const int udp_timeout=2000;
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const int timer_interval=400;
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//const uint16_t tcp_window=50000;
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@ -65,7 +67,7 @@ const int RETRY_TIME=3;
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const int debug_mode=0;
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int bind_fd;
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const int seq_mode=2; //0 increase /1 dont increase //increase randomly,about every 10 packet
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const int seq_mode=2; //0 dont increase /1 increase //increase randomly,about every 10 packet
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const uint64_t epoll_timer_fd_sn=1;
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const uint64_t epoll_raw_recv_fd_sn=2;
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@ -285,6 +287,8 @@ struct packet_info_t
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bool syn,ack,psh;
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uint32_t seq,ack_seq;
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uint32_t ts,ts_ack;
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}g_packet_info;
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@ -320,7 +324,7 @@ unsigned short csum(unsigned short *ptr,int nbytes) {
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return(answer);
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}
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uint16_t ip_id=1;
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int send_raw(packet_info_t &info,char * payload,int payloadlen)
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{
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if(prog_mode==client_mode&& payloadlen!=9 ||prog_mode==server_mode&& payloadlen!=5)
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@ -333,14 +337,10 @@ int send_raw(packet_info_t &info,char * payload,int payloadlen)
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//TCP header
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struct tcphdr *tcph = (struct tcphdr *) (raw_send_buf + sizeof (struct ip));
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struct sockaddr_in sin;
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struct pseudo_header psh;
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//Data part
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data = raw_send_buf + sizeof(struct iphdr) + sizeof(struct tcphdr);
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memcpy(data , payload, payloadlen);
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//some address resolution
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sin.sin_family = AF_INET;
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sin.sin_port = htons(info.dst_port);
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@ -350,10 +350,10 @@ int send_raw(packet_info_t &info,char * payload,int payloadlen)
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iph->ihl = 5;
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iph->version = 4;
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iph->tos = 0;
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iph->tot_len = sizeof (struct iphdr) + sizeof (struct tcphdr) + payloadlen;
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iph->id = htonl (54321); //Id of this packet
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iph->frag_off = 0;
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iph->ttl = 255;
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iph->id = htonl (ip_id++); //Id of this packet
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iph->frag_off = htons(0x4000); //DF set,others are zero
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iph->ttl = 64;
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iph->protocol = IPPROTO_TCP;
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iph->check = 0; //Set to 0 before calculating checksum
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iph->saddr = info.src_ip; //Spoof the source ip address
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@ -366,30 +366,91 @@ int send_raw(packet_info_t &info,char * payload,int payloadlen)
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tcph->seq =htonl(info.seq);
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tcph->ack_seq = htonl(info.ack_seq);
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tcph->doff = 5; //tcp header size
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tcph->fin=0;
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tcph->syn=info.syn;
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tcph->rst=0;
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tcph->psh=info.psh;
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tcph->ack=info.ack;
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if(tcph->syn==1)
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{
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tcph->doff = 10; //tcp header size
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int i=sizeof (struct iphdr)+20;
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raw_send_buf[i++]=0x02;//mss
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raw_send_buf[i++]=0x04;
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raw_send_buf[i++]=0x05;
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raw_send_buf[i++]=0xb4;
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//raw_send_buf[i++]=0x01;
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//raw_send_buf[i++]=0x01;
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raw_send_buf[i++]=0x04; //sack ok
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raw_send_buf[i++]=0x02; //sack ok
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raw_send_buf[i++]=0x08; //i=6;
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raw_send_buf[i++]=0x0a;
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*(uint32_t*)(& raw_send_buf[i])=htonl((uint32_t)get_current_time());
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i+=4;
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*(uint32_t*)(& raw_send_buf[i])=htonl(info.ts_ack);
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i+=4;
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raw_send_buf[i++]=0x01;
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raw_send_buf[i++]=0x03;
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raw_send_buf[i++]=0x03;
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raw_send_buf[i++]=0x05;
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}
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else
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{
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tcph->doff=8;
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int i=sizeof (struct iphdr)+20;
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raw_send_buf[i++]=0x01;
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raw_send_buf[i++]=0x01;
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raw_send_buf[i++]=0x08; //i=0;
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raw_send_buf[i++]=0x0a;
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*(uint32_t*)(& raw_send_buf[i])=htonl((uint32_t)get_current_time());
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i+=4;
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*(uint32_t*)(& raw_send_buf[i])=htonl(info.ts_ack);
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i+=4;
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}
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tcph->urg=0;
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tcph->window = htons((uint16_t)(40000+random()%20000));
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//tcph->window = htons((uint16_t)(1024));
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tcph->window = htons((uint16_t)(10240+random()%100));
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tcph->check = 0; //leave checksum 0 now, filled later by pseudo header
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tcph->urg_ptr = 0;
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//Data part
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data = raw_send_buf + sizeof(struct iphdr) + tcph->doff*4;
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iph->tot_len = sizeof (struct iphdr) + tcph->doff*4 + payloadlen;
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memcpy(data , payload, payloadlen);
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psh.source_address = info.src_ip;
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psh.dest_address = sin.sin_addr.s_addr;
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psh.placeholder = 0;
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psh.protocol = IPPROTO_TCP;
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psh.tcp_length = htons(sizeof(struct tcphdr) + payloadlen );
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psh.tcp_length = htons(tcph->doff*4 + payloadlen );
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int psize = sizeof(struct pseudo_header) + sizeof(struct tcphdr) + payloadlen;
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int psize = sizeof(struct pseudo_header) + tcph->doff*4 + payloadlen;
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memcpy(raw_send_buf2 , (char*) &psh , sizeof (struct pseudo_header));
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memcpy(raw_send_buf2 + sizeof(struct pseudo_header) , tcph , sizeof(struct tcphdr) + payloadlen);
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memcpy(raw_send_buf2 + sizeof(struct pseudo_header) , tcph , tcph->doff*4 + payloadlen);
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tcph->check = csum( (unsigned short*) raw_send_buf2, psize);
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@ -401,18 +462,19 @@ int send_raw(packet_info_t &info,char * payload,int payloadlen)
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printf("sent seq ack_seq len<%u %u %d>\n",g_packet_info.seq,g_packet_info.ack_seq,payloadlen);
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int ret = sendto(raw_send_fd, raw_send_buf, iph->tot_len , 0, (struct sockaddr *) &sin, sizeof (sin));
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if(g_packet_info.syn==0&&g_packet_info.ack==1&&payloadlen!=0)
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{
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if(seq_mode==0)
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{
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g_packet_info.seq+=payloadlen;
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}
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else if(seq_mode==1)
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{
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g_packet_info.seq+=payloadlen;
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}
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else if(seq_mode==3)
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else if(seq_mode==2)
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{
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if(random()% 20==5 )
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g_packet_info.seq+=payloadlen;
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@ -540,7 +602,9 @@ int fake_tcp_keep_connection_client() //for client
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init_filter(g_packet_info.src_port);
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g_packet_info.seq=get_true_random_number();
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g_packet_info.ack_seq=get_true_random_number();
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g_packet_info.ack_seq=0;//get_true_random_number();
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g_packet_info.ts_ack=0;
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send_sync(/*sync*/);//send sync
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}
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if(client_current_state==client_syn_sent &&get_current_time()-last_state_time>handshake_timeout)
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@ -679,8 +743,8 @@ int set_timer(int epollfd,int &timer_fd)
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printf("timer_fd create error");
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exit(1);
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}
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its.it_interval.tv_sec=1;
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its.it_value.tv_sec=1;
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its.it_interval.tv_nsec=timer_interval*1000ll*1000ll;
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its.it_value.tv_nsec=1; //imidiately
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timerfd_settime(timer_fd,0,&its,0);
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@ -804,7 +868,11 @@ int server_raw_recv(iphdr * iph,tcphdr *tcph,char * data,int data_len)
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g_packet_info.psh=0;
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g_packet_info.syn=1;
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g_packet_info.ack=1;
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g_packet_info.seq;//dont need to set
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g_packet_info.seq=get_true_random_number();//not necessary to set
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printf("sent syn ack\n");
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fflush(stdout);
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send_raw(g_packet_info,0,0);
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@ -983,9 +1051,9 @@ int on_raw_recv()
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return 0;
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}
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char *ip_data=buf+14;
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char *ip_begin=buf+14;
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struct iphdr *iph = (struct iphdr *) (ip_data);
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struct iphdr *iph = (struct iphdr *) (ip_begin);
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if (!(iph->ihl > 0 && iph->ihl <=60)) {
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@ -1002,7 +1070,7 @@ int on_raw_recv()
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int ip_len=ntohs(iph->tot_len);
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unsigned short iphdrlen =iph->ihl*4;
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struct tcphdr *tcph=(struct tcphdr*)(ip_data+ iphdrlen);
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struct tcphdr *tcph=(struct tcphdr*)(ip_begin+ iphdrlen);
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unsigned short tcphdrlen = tcph->doff*4;
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if (!(tcph->doff > 0 && tcph->doff <=60)) {
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@ -1012,7 +1080,7 @@ int on_raw_recv()
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/////ip
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uint32_t ip_chk=csum ((unsigned short *) ip_data, iphdrlen);
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uint32_t ip_chk=csum ((unsigned short *) ip_begin, iphdrlen);
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int psize = sizeof(struct pseudo_header) + ip_len-iphdrlen;
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/////ip end
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@ -1028,7 +1096,7 @@ int on_raw_recv()
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psh.tcp_length = htons(ip_len-iphdrlen);
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memcpy(raw_recv_buf2 , (char*) &psh , sizeof (struct pseudo_header));
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memcpy(raw_recv_buf2 + sizeof(struct pseudo_header) , ip_data+ iphdrlen , ip_len-iphdrlen);
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memcpy(raw_recv_buf2 + sizeof(struct pseudo_header) , ip_begin+ iphdrlen , ip_len-iphdrlen);
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uint16_t tcp_chk = csum( (unsigned short*) raw_recv_buf2, psize);
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@ -1045,6 +1113,24 @@ int on_raw_recv()
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return 0;
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}
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char *tcp_begin=raw_recv_buf2+sizeof(struct pseudo_header); //data
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char *tcp_option=raw_recv_buf2+sizeof(struct pseudo_header)+sizeof(tcphdr);
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if(tcph->doff==10)
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{
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if(tcp_option[6]==0x08 &&tcp_option[7]==0x0a)
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{
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g_packet_info.ts_ack= ntohl(*(uint32_t*)(&tcp_option[8]));
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}
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}
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if(tcph->doff==8)
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{
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if(tcp_option[3]==0x08 &&tcp_option[4]==0x0a)
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{
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g_packet_info.ts_ack= ntohl(*(uint32_t*)(&tcp_option[0]));
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}
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}
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////tcp end
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@ -1055,7 +1141,7 @@ int on_raw_recv()
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int data_len = ip_len-tcphdrlen-iphdrlen;
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char *data=ip_data+tcphdrlen+iphdrlen;
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char *data=ip_begin+tcphdrlen+iphdrlen;
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if(prog_mode==client_mode&& data_len!=5 ||prog_mode==server_mode&& data_len!=9)
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{
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