基于socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL))，接收和发送数据软件，C++代码

以下是基于socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL))的接收和发送数据软件的C++代码示例：

#include <iostream>
#include <cstring>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <net/ethernet.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>

#define ETH_HDRLEN 14

using namespace std;

int main(int argc, char* argv[]) {
    int sock_fd;
    struct ifreq ifr;
    char iface[] = "eth0"; // 设备名称
    char buffer[ETH_FRAME_LEN];
    struct sockaddr_in source, dest;
    struct ethhdr* eth_hdr;
    struct iphdr* ip_hdr;
    struct tcphdr* tcp_hdr;
    int data_len;

    // 创建原始套接字
    sock_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
    if (sock_fd < 0) {
        perror("Error creating socket");
        return 1;
    }

    // 获取设备索引号
    memset(&ifr, 0, sizeof(ifr));
    strncpy(ifr.ifr_name, iface, sizeof(ifr.ifr_name)-1);
    if (ioctl(sock_fd, SIOCGIFINDEX, &ifr) < 0) {
        perror("Error getting interface index");
        return 1;
    }

    // 将socket与设备绑定
    struct sockaddr_ll socket_address;
    memset(&socket_address, 0, sizeof(socket_address));
    socket_address.sll_family   = PF_PACKET;
    socket_address.sll_ifindex  = ifr.ifr_ifindex;
    socket_address.sll_protocol = htons(ETH_P_ALL);
    bind(sock_fd, (struct sockaddr*)&socket_address, sizeof(socket_address));

    // 接收数据包
    while (true) {
        data_len = recvfrom(sock_fd, buffer, ETH_FRAME_LEN, 0, NULL, NULL);

        if (data_len < 0) {
            perror("Error receiving packet");
            break;
        }

        // 解析数据包
        eth_hdr = (struct ethhdr*)buffer;

        if (ntohs(eth_hdr->h_proto) != ETH_P_IP) {
            continue;
        }

        ip_hdr = (struct iphdr*)(buffer + ETH_HDRLEN);

        memset(&source, 0, sizeof(source));
        source.sin_addr.s_addr = ip_hdr->saddr;

        memset(&dest, 0, sizeof(dest));
        dest.sin_addr.s_addr = ip_hdr->daddr;

        if (ip_hdr->protocol == IPPROTO_TCP) {
            tcp_hdr = (struct tcphdr*)(buffer + ETH_HDRLEN + (ip_hdr->ihl * 4));

            cout << inet_ntoa(source.sin_addr) << ":" << ntohs(tcp_hdr->source)
                 << " -> " << inet_ntoa(dest.sin_addr) << ":" << ntohs(tcp_hdr->dest) << endl;
        }
    }

    // 发送数据包
    memset(buffer, 0, sizeof(buffer));
    eth_hdr = (struct ethhdr*)buffer;

    // 目标MAC地址
    eth_hdr->h_dest[0] = 0x00;
    eth_hdr->h_dest[1] = 0x11;
    eth_hdr->h_dest[2] = 0x22;
    eth_hdr->h_dest[3] = 0x33;
    eth_hdr->h_dest[4] = 0x44;
    eth_hdr->h_dest[5] = 0x55;

    // 源MAC地址
    eth_hdr->h_source[0] = 0x55;
    eth_hdr->h_source[1] = 0x44;
    eth_hdr->h_source[2] = 0x33;
    eth_hdr->h_source[3] = 0x22;
    eth_hdr->h_source[4] = 0x11;
    eth_hdr->h_source[5] = 0x00;

    // 协议类型
    eth_hdr->h_proto = htons(ETH_P_IP);

    // IP头
    ip_hdr = (struct iphdr*)(buffer + ETH_HDRLEN);
    ip_hdr->version = 4;
    ip_hdr->ihl = 5;
    ip_hdr->tos = 0;
    ip_hdr->tot_len = htons(sizeof(struct iphdr) + sizeof(struct tcphdr));
    ip_hdr->id = htons(12345);
    ip_hdr->frag_off = 0;
    ip_hdr->ttl = 255;
    ip_hdr->protocol = IPPROTO_TCP;
    ip_hdr->check = 0;
    ip_hdr->saddr = inet_addr("192.168.0.1");
    ip_hdr->daddr = inet_addr("192.168.0.2");

    // TCP头
    tcp_hdr = (struct tcphdr*)(buffer + ETH_HDRLEN + (ip_hdr->ihl * 4));
    tcp_hdr->source = htons(12345);
    tcp_hdr->dest = htons(80);
    tcp_hdr->seq = htonl(1);
    tcp_hdr->ack_seq = 0;
    tcp_hdr->doff = 5;
    tcp_hdr->urg = 0;
    tcp_hdr->ack = 0;
    tcp_hdr->psh = 0;
    tcp_hdr->rst = 0;
    tcp_hdr->syn = 1;
    tcp_hdr->fin = 0;
    tcp_hdr->window = htons(1024);
    tcp_hdr->check = 0;
    tcp_hdr->urg_ptr = 0;

    // 发送数据包
    data_len = send(sock_fd, buffer, sizeof(struct ethhdr) + sizeof(struct iphdr) + sizeof(struct tcphdr), 0);
    if (data_len < 0) {
        perror("Error sending packet");
        return 1;
    }

    close(sock_fd);
    return 0;
}

该程序在基于socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL))的基础上，添加了发送数据包的功能。程序首先使用recvfrom函数接收数据包，并解析出IP、TCP头的源地址、目的地址、源端口、目的端口等信息进行输出。然后，程序构造了一个TCP SYN数据包，并使用send函数发送出去，实现了发送数据包的功能。