mirror of https://github.com/wangyu-/udp2raw.git
7.11 commit
This commit is contained in:
wangyu
wangyu
commit
ab2f1bfa93
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@ -0,0 +1,21 @@
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MIT License
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Copyright (c) 2017 Yu Wang (wangyucn at gmail.com)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
|
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furnished to do so, subject to the following conditions:
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||||
The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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@ -0,0 +1,940 @@
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#include<stdio.h>
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#include<string.h>
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#include<sys/socket.h>
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#include<arpa/inet.h>
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#include<stdlib.h>
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#include<getopt.h>
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#include <unistd.h>
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#include<errno.h>
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#include <fcntl.h>
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//#include"aes.h"
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#include <sys/epoll.h>
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#include <sys/wait.h>
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#include<map>
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#include<string>
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#include<vector>
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#include <sys/socket.h> //for socket ofcourse
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#include <sys/types.h>
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#include <stdlib.h> //for exit(0);
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#include <errno.h> //For errno - the error number
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#include <netinet/tcp.h> //Provides declarations for tcp header
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#include <netinet/ip.h> //Provides declarations for ip header
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#include <netinet/if_ether.h>
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#include <arpa/inet.h>
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#include <fcntl.h>
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#include <byteswap.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include <linux/if_ether.h>
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#include <linux/filter.h>
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#include <sys/time.h>
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#include <time.h>
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#include <sys/timerfd.h>
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using namespace std;
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char local_address[100], remote_address[100],source_address[100];
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int local_port = -1, remote_port = -1,source_port;
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const int buf_len = 20480;
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const int server_mode=2;
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const int client_mode=1;
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int prog_mode=0; //0 unset; 1client 2server
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const int RETRY_TIME=3;
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void handler(int num) {
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int status;
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int pid;
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while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
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if (WIFEXITED(status)) {
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//printf("The child exit with code %d",WEXITSTATUS(status));
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}
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}
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}
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void setnonblocking(int sock) {
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int opts;
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opts = fcntl(sock, F_GETFL);
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if (opts < 0) {
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perror("fcntl(sock,GETFL)");
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exit(1);
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}
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opts = opts | O_NONBLOCK;
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if (fcntl(sock, F_SETFL, opts) < 0) {
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perror("fcntl(sock,SETFL,opts)");
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exit(1);
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}
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}
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int udp_fd;
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int raw_recv_fd;
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int raw_send_fd;
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int init_raw_socket()
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{
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raw_send_fd = socket(AF_INET , SOCK_RAW , IPPROTO_TCP);
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if(raw_send_fd == -1) {
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perror("Failed to create raw_send_fd");
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exit(1);
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}
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//raw_fd = socket(AF_PACKET, SOCK_DGRAM, htons(ETH_P_ALL));
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raw_recv_fd= socket(PF_PACKET, SOCK_RAW, htons(ETH_P_IP));
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//raw_fd=socket(AF_PACKET , SOCK_RAW , htons(ETH_P_IP));
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// packet_recv_sd = socket(AF_INET , SOCK_RAW , IPPROTO_TCP);
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if(raw_recv_fd == -1) {
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//socket creation failed, may be because of non-root privileges
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perror("Failed to create raw_recv_fd");
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exit(1);
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}
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//IP_HDRINCL to tell the kernel that headers are included in the packet
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int one = 1;
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const int *val = &one;
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if (setsockopt (raw_send_fd, IPPROTO_IP, IP_HDRINCL, val, sizeof (one)) < 0) {
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perror("Error setting IP_HDRINCL");
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exit(2);
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}
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return 0;
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}
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char buf[buf_len];
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char buf2[buf_len];
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char raw_send_buf[buf_len];
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char raw_send_buf2[buf_len];
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struct sock_filter code[] = {
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{ 0x28, 0, 0, 0x0000000c },//0
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{ 0x15, 0, 10, 0x00000800 },//1
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{ 0x30, 0, 0, 0x00000017 },//2
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{ 0x15, 0, 8, 0x00000006 },//3
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{ 0x28, 0, 0, 0x00000014 },//4
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{ 0x45, 6, 0, 0x00001fff },//5
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{ 0xb1, 0, 0, 0x0000000e },//6
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{ 0x48, 0, 0, 0x0000000e },//7
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{ 0x15, 2, 0, 0x0000ef32 },//8
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{ 0x48, 0, 0, 0x00000010 },//9
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{ 0x15, 0, 1, 0x0000ef32 },//10
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{ 0x6, 0, 0, 0x0000ffff },//11
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{ 0x6, 0, 0, 0x00000000 },//12
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};
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sock_fprog bpf;
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long long get_current_time()
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{
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timespec tmp_time;
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clock_gettime(CLOCK_MONOTONIC, &tmp_time);
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return tmp_time.tv_sec*1000+tmp_time.tv_nsec/(1000*1000ll);
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}
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void init_filter(int port)
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{
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code[8].k=code[10].k=port;
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bpf.len = sizeof(code)/sizeof(code[0]);
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bpf.filter = code;
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//printf("<%d>\n",bpf.len);
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int ret = setsockopt(raw_recv_fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf, sizeof(bpf));
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memset(code,0,sizeof(code));
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if (ret != 0)
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{
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printf("error set fiter\n");
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exit(-1);
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}
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}
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void process_arg(int argc, char *argv[])
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{
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int i,j,k,opt;
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static struct option long_options[] =
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{
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/* These options set a flag. */
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{"source", required_argument, 0, 1},
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};
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int option_index = 0;
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printf("argc=%d ", argc);
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for (i = 0; i < argc; i++)
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printf("%s ", argv[i]);
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printf("\n");
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if (argc == 1)
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{
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printf(
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"proc -l [adress:]port -r [adress:]port [-a passwd] [-b passwd]\n");
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exit(-1);
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}
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int no_l = 1, no_r = 1;
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while ((opt = getopt_long(argc, argv, "l:r:sch",long_options,&option_index)) != -1) {
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//string opt_key;
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//opt_key+=opt;
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switch (opt) {
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case 'l':
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no_l = 0;
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if (strchr(optarg, ':') != 0) {
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sscanf(optarg, "%[^:]:%d", local_address, &local_port);
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} else {
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strcpy(local_address, "127.0.0.1");
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sscanf(optarg, "%d", &local_port);
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}
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break;
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case 'r':
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no_r = 0;
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if (strchr(optarg, ':') != 0) {
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sscanf(optarg, "%[^:]:%d", remote_address, &remote_port);
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} else {
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strcpy(remote_address, "127.0.0.1");
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sscanf(optarg, "%d", &remote_port);
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}
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break;
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case 's':
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if(prog_mode==0)
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{
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prog_mode=server_mode;
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}
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else
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{
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printf("-s /-c has already been set,-s option conflict");
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exit(-1);
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}
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break;
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case 'c':
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if(prog_mode==0)
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{
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prog_mode=client_mode;
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}
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else
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{
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printf("-s /-c has already been set,-c option conflict");
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exit(-1);
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}
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break;
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case 'h':
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break;
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case 1:
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if (strchr(optarg, ':') != 0) {
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sscanf(optarg, "%[^:]:%d", source_address, &source_port);
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printf("source: %s:%d",source_address,&source_port);
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} else {
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printf("format --source ip:adress");
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exit(-1);
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}
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break;
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default:
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printf("ignore unknown <%s>", optopt);
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}
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}
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if (no_l)
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printf("error: -i not found\n");
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if (no_r)
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printf("error: -o not found\n");
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if(prog_mode==0)
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printf("error: -s /-r hasnt been set\n");
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if (no_l || no_r||prog_mode==0)
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{
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exit(-1);
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}
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}
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int recv_raw()
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{
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}
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struct packet_info_t
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{
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//ip_part:
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uint32_t src_ip;
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uint16_t src_port;
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uint32_t dst_ip;
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uint16_t dst_port;
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|
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//tcp_part:
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bool syn,ack,psh;
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uint32_t seq,ack_seq;
|
||||
|
||||
|
||||
}g_packet_info;
|
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|
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struct pseudo_header {
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u_int32_t source_address;
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u_int32_t dest_address;
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||||
u_int8_t placeholder;
|
||||
u_int8_t protocol;
|
||||
u_int16_t tcp_length;
|
||||
};
|
||||
/*
|
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Generic checksum calculation function
|
||||
*/
|
||||
unsigned short csum(unsigned short *ptr,int nbytes) {
|
||||
register long sum;
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||||
unsigned short oddbyte;
|
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register short answer;
|
||||
|
||||
sum=0;
|
||||
while(nbytes>1) {
|
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sum+=*ptr++;
|
||||
nbytes-=2;
|
||||
}
|
||||
if(nbytes==1) {
|
||||
oddbyte=0;
|
||||
*((u_char*)&oddbyte)=*(u_char*)ptr;
|
||||
sum+=oddbyte;
|
||||
}
|
||||
|
||||
sum = (sum>>16)+(sum & 0xffff);
|
||||
sum = sum + (sum>>16);
|
||||
answer=(short)~sum;
|
||||
|
||||
return(answer);
|
||||
}
|
||||
|
||||
int send_raw(packet_info_t &info,char * payload,int payloadlen)
|
||||
{
|
||||
char *data;
|
||||
|
||||
memset(raw_send_buf,0,payloadlen+100);
|
||||
|
||||
struct iphdr *iph = (struct iphdr *) raw_send_buf;
|
||||
|
||||
//TCP header
|
||||
struct tcphdr *tcph = (struct tcphdr *) (raw_send_buf + sizeof (struct ip));
|
||||
struct sockaddr_in sin;
|
||||
struct pseudo_header psh;
|
||||
|
||||
//Data part
|
||||
data = raw_send_buf + sizeof(struct iphdr) + sizeof(struct tcphdr);
|
||||
|
||||
memcpy(data , payload, payloadlen);
|
||||
|
||||
//some address resolution
|
||||
sin.sin_family = AF_INET;
|
||||
sin.sin_port = htons(info.dst_port);
|
||||
sin.sin_addr.s_addr = info.dst_ip;
|
||||
|
||||
//Fill in the IP Header
|
||||
iph->ihl = 5;
|
||||
iph->version = 4;
|
||||
iph->tos = 0;
|
||||
iph->tot_len = sizeof (struct iphdr) + sizeof (struct tcphdr) + payloadlen;
|
||||
iph->id = htonl (54321); //Id of this packet
|
||||
iph->frag_off = 0;
|
||||
iph->ttl = 255;
|
||||
iph->protocol = IPPROTO_TCP;
|
||||
iph->check = 0; //Set to 0 before calculating checksum
|
||||
iph->saddr = info.src_ip; //Spoof the source ip address
|
||||
iph->daddr = info.dst_ip;
|
||||
|
||||
//TCP Header
|
||||
tcph->source = htons(info.src_port);
|
||||
tcph->dest = htons(info.dst_port);
|
||||
|
||||
tcph->seq =htonl(info.seq);
|
||||
tcph->ack_seq = htonl(info.ack);
|
||||
|
||||
tcph->doff = 5; //tcp header size
|
||||
tcph->fin=0;
|
||||
tcph->syn=info.syn;
|
||||
tcph->rst=0;
|
||||
tcph->psh=info.psh;
|
||||
tcph->ack=info.ack;
|
||||
|
||||
tcph->urg=0;
|
||||
tcph->window = htons((uint16_t)129600);
|
||||
tcph->check = 0; //leave checksum 0 now, filled later by pseudo header
|
||||
tcph->urg_ptr = 0;
|
||||
|
||||
psh.source_address = info.src_ip;
|
||||
psh.dest_address = sin.sin_addr.s_addr;
|
||||
psh.placeholder = 0;
|
||||
psh.protocol = IPPROTO_TCP;
|
||||
psh.tcp_length = htons(sizeof(struct tcphdr) + payloadlen );
|
||||
|
||||
int psize = sizeof(struct pseudo_header) + sizeof(struct tcphdr) + payloadlen;
|
||||
|
||||
memcpy(raw_send_buf2 , (char*) &psh , sizeof (struct pseudo_header));
|
||||
memcpy(raw_send_buf2 + sizeof(struct pseudo_header) , tcph , sizeof(struct tcphdr) + payloadlen);
|
||||
|
||||
tcph->check = csum( (unsigned short*) raw_send_buf2, psize);
|
||||
|
||||
//Ip checksum
|
||||
iph->check = csum ((unsigned short *) raw_send_buf, iph->tot_len);
|
||||
|
||||
int ret = sendto(raw_send_fd, raw_send_buf, iph->tot_len , 0, (struct sockaddr *) &sin, sizeof (sin));
|
||||
printf("<ret:%d>\n",ret);
|
||||
if(ret<0)
|
||||
{
|
||||
|
||||
perror("raw send error");
|
||||
//printf("send error\n");
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
int send_sync()
|
||||
{
|
||||
g_packet_info.seq=0;
|
||||
g_packet_info.ack=0;
|
||||
g_packet_info.syn=1;
|
||||
g_packet_info.ack_seq=0;
|
||||
g_packet_info.psh=0;
|
||||
send_raw(g_packet_info,0,0);
|
||||
return 0;
|
||||
}
|
||||
const int client_nothing=0;
|
||||
const int client_syn_sent=1;
|
||||
const int client_ack_sent=2;
|
||||
const int client_ready=3;
|
||||
int client_current_state=client_nothing;
|
||||
int retry_counter;
|
||||
|
||||
long long last_state_time;
|
||||
uint32_t session_id;
|
||||
|
||||
uint32_t get_true_random_number()
|
||||
{
|
||||
uint32_t ret;
|
||||
int fd=open("/dev/urandom",O_RDONLY);
|
||||
read(fd,&ret,sizeof(ret));
|
||||
return htonl(ret);
|
||||
}
|
||||
const int server_nothing=0;
|
||||
const int server_syn_ack_sent=1;
|
||||
const int server_heartbeat_sent=2;
|
||||
const int server_ready=3;
|
||||
int server_current_state=server_nothing;
|
||||
long long last_hb_recv_time;
|
||||
int fake_tcp_keep_connection_client() //for client
|
||||
{
|
||||
//printf("timer!");
|
||||
//fflush(stdout);
|
||||
begin:
|
||||
if(client_current_state==client_nothing)
|
||||
{
|
||||
send_sync(/*sync*/);//send sync
|
||||
client_current_state=client_syn_sent;
|
||||
last_state_time=get_current_time();
|
||||
printf("state changed from nothing to syn_sent\n");
|
||||
retry_counter=RETRY_TIME;
|
||||
|
||||
}
|
||||
if(client_current_state==client_syn_sent &&get_current_time()-last_state_time>1000ll)
|
||||
{
|
||||
if(retry_counter==0)
|
||||
{
|
||||
client_current_state=client_nothing;
|
||||
goto begin;
|
||||
}
|
||||
else
|
||||
{
|
||||
retry_counter--;
|
||||
printf("retry send sync\n");
|
||||
send_sync(/*sync*/);//send sync again
|
||||
last_state_time=get_current_time();
|
||||
}
|
||||
}
|
||||
if(client_current_state==client_ack_sent &&get_current_time()-last_state_time>1000)
|
||||
{
|
||||
printf("!!!!!\n");
|
||||
fflush(stdout);
|
||||
if(retry_counter==0)
|
||||
{
|
||||
client_current_state=client_nothing;
|
||||
goto begin;
|
||||
}
|
||||
else
|
||||
{
|
||||
retry_counter--;
|
||||
send_raw(g_packet_info,0,0);
|
||||
last_state_time=get_current_time();
|
||||
printf("retry send ack counter left:%d\n",retry_counter);
|
||||
fflush(stdout);
|
||||
}
|
||||
}
|
||||
|
||||
if(client_current_state==client_ready)
|
||||
{
|
||||
printf("time %lld %lld\n",get_current_time(),last_state_time);
|
||||
if(get_current_time()-last_hb_recv_time>5*1000ll)
|
||||
{
|
||||
client_current_state=client_nothing;
|
||||
return 0;
|
||||
}
|
||||
g_packet_info.syn=0;
|
||||
g_packet_info.ack=1;
|
||||
printf("heartbeat sent\n");
|
||||
send_raw(g_packet_info,"hb",strlen("hb"));
|
||||
//last_time=get_current_time();
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
int fake_tcp_keep_connection_server()
|
||||
{
|
||||
//begin:
|
||||
printf("timerxxxx!\n");
|
||||
fflush(stdout);
|
||||
if(server_current_state==server_nothing)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
if(server_current_state==server_syn_ack_sent &&get_current_time()-last_state_time>1000ll )
|
||||
{
|
||||
if(retry_counter==0)
|
||||
{
|
||||
server_current_state=server_nothing;
|
||||
//send_raw(g_packet_info,0,0);
|
||||
}
|
||||
else
|
||||
{
|
||||
retry_counter--;
|
||||
send_raw(g_packet_info,0,0);
|
||||
last_state_time=get_current_time();
|
||||
printf("resend syn ack\n");
|
||||
}
|
||||
//send_raw(/*syn ack*/);
|
||||
}
|
||||
if(server_current_state==server_heartbeat_sent||server_current_state==server_ready)
|
||||
{
|
||||
if(get_current_time()-last_hb_recv_time>5*1000ll)
|
||||
{
|
||||
printf("%lld %lld",get_current_time(),last_state_time);
|
||||
server_current_state=server_nothing;
|
||||
printf("changed state to server_nothing111\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
g_packet_info.syn=0;
|
||||
g_packet_info.ack=1;
|
||||
g_packet_info.psh=1;
|
||||
send_raw(g_packet_info,"hb",strlen("hb"));
|
||||
//last_time=get_current_time();
|
||||
printf("heart beat sent,fffff\n");
|
||||
fflush(stdout);
|
||||
}
|
||||
|
||||
}
|
||||
struct sockaddr_in udp_old_addr_in;
|
||||
|
||||
|
||||
|
||||
int set_timer(int epollfd,int &timer_fd)
|
||||
{
|
||||
int ret;
|
||||
epoll_event ev;
|
||||
|
||||
itimerspec its;
|
||||
memset(&its,0,sizeof(its));
|
||||
|
||||
if((timer_fd=timerfd_create(CLOCK_MONOTONIC,TFD_NONBLOCK)) < 0)
|
||||
{
|
||||
printf("timer_fd create error");
|
||||
exit(1);
|
||||
}
|
||||
its.it_interval.tv_sec=1;
|
||||
its.it_value.tv_sec=1;
|
||||
timerfd_settime(timer_fd,0,&its,0);
|
||||
|
||||
|
||||
ev.events = EPOLLIN;
|
||||
ev.data.fd = timer_fd;
|
||||
|
||||
epoll_ctl(epollfd, EPOLL_CTL_ADD, timer_fd, &ev);
|
||||
if (ret < 0) {
|
||||
printf("epoll_ctl return %d\n", ret);
|
||||
exit(-1);
|
||||
}
|
||||
}
|
||||
|
||||
const int MTU=1440;
|
||||
int client_recv(iphdr * iph,tcphdr *tcph,char * data,int data_len)
|
||||
{
|
||||
|
||||
if(client_current_state==client_syn_sent )
|
||||
{
|
||||
if (!(tcph->syn==1&&tcph->ack==1)) return 0;
|
||||
if(iph->saddr!=g_packet_info.dst_ip||ntohs(tcph->source)!=g_packet_info.dst_port)
|
||||
{
|
||||
printf("unexpected adress %d %d %d %d\n",iph->saddr,g_packet_info.dst_ip,ntohl(tcph->source),g_packet_info.dst_port);
|
||||
return 0;
|
||||
}
|
||||
|
||||
g_packet_info.ack_seq=ntohl(tcph->ack_seq)+1;
|
||||
g_packet_info.psh=0;
|
||||
g_packet_info.syn=0;
|
||||
g_packet_info.ack=1;
|
||||
g_packet_info.seq+=1;
|
||||
|
||||
printf("sent ack back\n");
|
||||
fflush(stdout);
|
||||
send_raw(g_packet_info,0,0);
|
||||
client_current_state=client_ack_sent;
|
||||
printf("changed state to client_ack_sent\n");
|
||||
last_state_time=get_current_time();
|
||||
retry_counter=RETRY_TIME;
|
||||
}
|
||||
if(client_current_state==client_ack_sent )
|
||||
{
|
||||
//printf(" i m here\n");
|
||||
//fflush(stdout);
|
||||
if( tcph->syn==1||tcph->ack!=1 )
|
||||
{
|
||||
printf("unexpected syn ack");
|
||||
return 0;
|
||||
}
|
||||
if(iph->saddr!=g_packet_info.dst_ip||ntohs(tcph->source)!=g_packet_info.dst_port)
|
||||
{
|
||||
printf("unexpected adress\n");
|
||||
return 0;
|
||||
}
|
||||
client_current_state=client_ready;
|
||||
printf("changed state to client_ready\n");
|
||||
//send_raw(g_packet_info,"hb",strlen("hb"));
|
||||
}
|
||||
if(client_current_state==client_ready )
|
||||
{
|
||||
printf("heart beat received\n");
|
||||
last_hb_recv_time=get_current_time();
|
||||
}
|
||||
}
|
||||
int send_heart_beat(packet_info_t &info)
|
||||
{
|
||||
|
||||
}
|
||||
int server_recv(iphdr * iph,tcphdr *tcph,char * data,int data_len)
|
||||
{
|
||||
if(server_current_state==server_nothing)
|
||||
{
|
||||
if(!( tcph->syn==1&&tcph->ack==0 )) return 0;
|
||||
|
||||
g_packet_info.dst_port=ntohs(tcph->source);
|
||||
g_packet_info.dst_ip=iph->saddr;
|
||||
|
||||
g_packet_info.ack_seq=ntohl(tcph->ack_seq)+1;
|
||||
g_packet_info.psh=0;
|
||||
g_packet_info.syn=1;
|
||||
g_packet_info.ack=1;
|
||||
g_packet_info.seq;//dont need to set
|
||||
printf("sent syn ack\n");
|
||||
fflush(stdout);
|
||||
send_raw(g_packet_info,0,0);
|
||||
server_current_state=server_syn_ack_sent;
|
||||
printf("changed state to server_syn_ack_sent\n");
|
||||
retry_counter=RETRY_TIME;
|
||||
last_state_time=get_current_time();
|
||||
}
|
||||
else if(server_current_state==server_syn_ack_sent)
|
||||
{
|
||||
if(!( tcph->syn==0&&tcph->ack==1 )) return 0;
|
||||
|
||||
|
||||
server_current_state=server_heartbeat_sent;
|
||||
g_packet_info.syn=0;
|
||||
g_packet_info.ack=1;
|
||||
|
||||
send_raw(g_packet_info,"hb",strlen("hb"));
|
||||
printf("changed state to server_heartbeat_sent\n");
|
||||
|
||||
last_hb_recv_time=get_current_time(); //this ack is counted as hearbeat
|
||||
last_state_time=get_current_time();
|
||||
}
|
||||
else if(server_current_state==server_heartbeat_sent)//heart beat received
|
||||
{
|
||||
if( tcph->syn==1||tcph->ack!=1 ) return 0;
|
||||
if(iph->saddr!=g_packet_info.dst_ip||ntohs(tcph->source)!=g_packet_info.dst_port)
|
||||
{
|
||||
printf("unexpected adress\n");
|
||||
return 0;
|
||||
}
|
||||
server_current_state=server_ready;
|
||||
last_state_time=get_current_time();
|
||||
last_hb_recv_time=get_current_time();
|
||||
printf("changed state to server_ready\n");
|
||||
|
||||
}
|
||||
else if(server_current_state==server_ready)
|
||||
{
|
||||
if( tcph->syn==1||tcph->ack!=1 ) return 0;
|
||||
if(iph->saddr!=g_packet_info.dst_ip||ntohs(tcph->source)!=g_packet_info.dst_port)
|
||||
{
|
||||
printf("unexpected adress\n");
|
||||
return 0;
|
||||
}
|
||||
printf("heart beat received\n");
|
||||
last_hb_recv_time=get_current_time();
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int on_raw_recv()
|
||||
{
|
||||
int size;
|
||||
struct sockaddr saddr;
|
||||
socklen_t saddr_size;
|
||||
saddr_size = sizeof(saddr);
|
||||
|
||||
printf("raw!\n");
|
||||
fflush(stdout);
|
||||
|
||||
size = recvfrom(raw_recv_fd, buf, buf_len, 0 ,&saddr , &saddr_size);
|
||||
|
||||
char *ip_data=buf+14;
|
||||
|
||||
struct iphdr *iph = (struct iphdr *) (ip_data);
|
||||
|
||||
|
||||
if (!(iph->ihl > 0 && iph->ihl < (MTU)/4)) {
|
||||
printf("iph ihl error");
|
||||
fflush(stdout);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (iph->protocol != IPPROTO_TCP) {
|
||||
printf("iph protocal != tcp\n");
|
||||
fflush(stdout);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
int ip_len=ntohs(iph->tot_len);
|
||||
|
||||
unsigned short iphdrlen =iph->ihl*4;
|
||||
struct tcphdr *tcph=(struct tcphdr*)(ip_data+ iphdrlen);
|
||||
unsigned short tcphdrlen = tcph->doff*4;
|
||||
|
||||
if (!(tcph->doff > 0 && tcph->doff < (MTU - iphdrlen)/4)) {
|
||||
printf("tcph error");
|
||||
fflush(stdout);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int data_len = ip_len-tcphdrlen-iphdrlen;
|
||||
|
||||
char *data=ip_data+tcphdrlen+iphdrlen;
|
||||
|
||||
//printf("%d\n",ip_len);
|
||||
/*
|
||||
for(int i=0;i<size;i++)
|
||||
{
|
||||
printf("<%x>",(unsigned char)buf[i]);
|
||||
|
||||
}
|
||||
printf("\n");
|
||||
|
||||
for(int i=0;i<data_len;i++)
|
||||
{
|
||||
printf("<%x>",(unsigned char)data[i]);
|
||||
}*/
|
||||
|
||||
printf("\n");
|
||||
printf("<%u,%u,%u,%u,%d>\n",(unsigned int)iphdrlen,(unsigned int)tcphdrlen,(unsigned int)tcph->syn,(unsigned int)tcph->ack,data_len);
|
||||
fflush(stdout);
|
||||
|
||||
if(prog_mode==server_mode)
|
||||
{
|
||||
server_recv(iph,tcph,data,data_len);
|
||||
}
|
||||
else
|
||||
{
|
||||
client_recv(iph,tcph,data,data_len);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
int client()
|
||||
{
|
||||
int i, j, k;int ret;
|
||||
init_raw_socket();
|
||||
session_id=get_true_random_number();
|
||||
|
||||
init_filter(source_port);
|
||||
g_packet_info.dst_ip=inet_addr(remote_address);
|
||||
g_packet_info.dst_port=remote_port;
|
||||
|
||||
g_packet_info.src_ip=inet_addr(source_address);
|
||||
g_packet_info.src_port=source_port;
|
||||
|
||||
int udp_fd=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
||||
int yes = 1;
|
||||
//setsockopt(udp_fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
|
||||
|
||||
struct sockaddr_in local_me;
|
||||
|
||||
socklen_t slen = sizeof(sockaddr_in);
|
||||
memset(&local_me, 0, sizeof(local_me));
|
||||
local_me.sin_family = AF_INET;
|
||||
local_me.sin_port = htons(local_port);
|
||||
local_me.sin_addr.s_addr = inet_addr(local_address);
|
||||
if (bind(udp_fd, (struct sockaddr*) &local_me, slen) == -1) {
|
||||
perror("socket bind error");
|
||||
exit(1);
|
||||
}
|
||||
setnonblocking(udp_fd);
|
||||
int epollfd = epoll_create1(0);
|
||||
const int max_events = 4096;
|
||||
struct epoll_event ev, events[max_events];
|
||||
if (epollfd < 0) {
|
||||
printf("epoll return %d\n", epollfd);
|
||||
exit(-1);
|
||||
}
|
||||
ev.events = EPOLLIN;
|
||||
ev.data.fd = udp_fd;
|
||||
ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, udp_fd, &ev);
|
||||
if (ret!=0) {
|
||||
printf("add udp_listen_fd error\n");
|
||||
exit(-1);
|
||||
}
|
||||
ev.events = EPOLLIN;
|
||||
ev.data.fd = raw_recv_fd;
|
||||
|
||||
ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, raw_recv_fd, &ev);
|
||||
if (ret!= 0) {
|
||||
printf("add raw_fd error\n");
|
||||
exit(-1);
|
||||
}
|
||||
|
||||
////add_timer for fake_tcp_keep_connection_client
|
||||
|
||||
//sleep(10);
|
||||
|
||||
memset(&udp_old_addr_in,0,sizeof(sockaddr_in));
|
||||
int unbind=1;
|
||||
int timer_fd;
|
||||
|
||||
set_timer(epollfd,timer_fd);
|
||||
while(1)////////////////////////
|
||||
{
|
||||
int nfds = epoll_wait(epollfd, events, max_events, 180 * 1000);
|
||||
if (nfds < 0) { //allow zero
|
||||
printf("epoll_wait return %d\n", nfds);
|
||||
exit(-1);
|
||||
}
|
||||
int n;
|
||||
for (n = 0; n < nfds; ++n) {
|
||||
if (events[n].data.fd == raw_recv_fd)
|
||||
{
|
||||
on_raw_recv();
|
||||
/*if(is_sync_ack)
|
||||
{
|
||||
|
||||
}
|
||||
else if(is heart_beat)
|
||||
{
|
||||
|
||||
}
|
||||
else if(is_data)
|
||||
{
|
||||
sendto();
|
||||
}*/
|
||||
}
|
||||
if(events[n].data.fd ==timer_fd)
|
||||
{
|
||||
//printf("timer!\n");
|
||||
//fflush(stdout);
|
||||
uint64_t value;
|
||||
read(timer_fd, &value, 8);
|
||||
fake_tcp_keep_connection_client();
|
||||
}
|
||||
if (events[n].data.fd == udp_fd)
|
||||
{
|
||||
socklen_t recv_len;
|
||||
struct sockaddr_in udp_new_addr_in;
|
||||
if ((recv_len = recvfrom(udp_fd, buf, buf_len, 0,
|
||||
(struct sockaddr *) &udp_new_addr_in, &slen)) == -1) {
|
||||
printf("recv_from error");
|
||||
exit(1);
|
||||
}
|
||||
printf("Received packet from %s:%d\n", inet_ntoa(udp_new_addr_in.sin_addr),
|
||||
ntohs(udp_new_addr_in.sin_port));
|
||||
fflush(stdout);
|
||||
if(udp_old_addr_in.sin_addr.s_addr==0&&udp_old_addr_in.sin_port==0)
|
||||
{
|
||||
memcpy(&udp_old_addr_in,&udp_new_addr_in,sizeof(udp_new_addr_in));
|
||||
}
|
||||
else if(udp_new_addr_in.sin_addr.s_addr!=udp_old_addr_in.sin_addr.s_addr
|
||||
||udp_new_addr_in.sin_port!=udp_old_addr_in.sin_port)
|
||||
{
|
||||
printf("new <ip,port> connected in,ignore\n");
|
||||
fflush(stdout);
|
||||
continue;
|
||||
}
|
||||
////send_data_raw(buf,recv_len);
|
||||
}
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
int server()
|
||||
{
|
||||
int i, j, k;int ret;
|
||||
init_raw_socket();
|
||||
init_filter(local_port);
|
||||
int epollfd = epoll_create1(0);
|
||||
const int max_events = 4096;
|
||||
|
||||
g_packet_info.src_ip=inet_addr(local_address);
|
||||
g_packet_info.src_port=local_port;
|
||||
|
||||
struct epoll_event ev, events[max_events];
|
||||
if (epollfd < 0) {
|
||||
printf("epoll return %d\n", epollfd);
|
||||
exit(-1);
|
||||
}
|
||||
|
||||
ev.events = EPOLLIN;
|
||||
ev.data.fd = raw_recv_fd;
|
||||
|
||||
ret = epoll_ctl(epollfd, EPOLL_CTL_ADD, raw_recv_fd, &ev);
|
||||
if (ret!= 0) {
|
||||
printf("add raw_fd error\n");
|
||||
exit(-1);
|
||||
}
|
||||
int timer_fd;
|
||||
set_timer(epollfd,timer_fd);
|
||||
while(1)////////////////////////
|
||||
{
|
||||
int nfds = epoll_wait(epollfd, events, max_events, 180 * 1000);
|
||||
if (nfds < 0) { //allow zero
|
||||
printf("epoll_wait return %d\n", nfds);
|
||||
exit(-1);
|
||||
}
|
||||
int n;
|
||||
const int MTU=1440;
|
||||
for (n = 0; n < nfds; ++n)
|
||||
{
|
||||
printf("%d %d %d %d\n",timer_fd,raw_recv_fd,raw_send_fd,n);
|
||||
if (events[n].data.fd == timer_fd)
|
||||
{
|
||||
uint64_t value;
|
||||
read(timer_fd, &value, 8);
|
||||
fake_tcp_keep_connection_server();
|
||||
}
|
||||
if (events[n].data.fd == raw_recv_fd)
|
||||
{
|
||||
on_raw_recv();
|
||||
}
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
int i, j, k;
|
||||
|
||||
signal(SIGCHLD, handler);
|
||||
process_arg(argc,argv);
|
||||
|
||||
if(prog_mode==client_mode)
|
||||
{
|
||||
client();
|
||||
}
|
||||
else
|
||||
{
|
||||
server();
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue