raw udp发送数据代码

在Python中，你可以使用socket模块来实现UDP（用户数据报协议）的raw模式发送数据。以下是一个简单的例子：

import socket
import struct

# 创建一个原始套接字
sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_UDP)

# 设置IP头部信息
ip_header = b'\x08\x00'  # IPv4头，版本=4，头部长度=5（包括IP头部和UDP头部）
udp_header = struct.pack('!HH', 0x11, 65000)  # UDP头部，端口号=65000，长度=8（固定）

# 数据（这里以字节形式举例）
data = b'Hello, UDP Raw Data'

# 将IP和UDP头部添加到数据前
payload = ip_header + udp_header + data

# 发送数据
dest_ip = '192.168.1.2'  # 目标IP地址
dest_port = 12345  # 目标端口
sock.sendto(payload, (dest_ip, dest_port))

# 关闭套接字
sock.close()

注意：这个代码片段用于演示如何在本地环境中发送UDP数据包，并非实际网络环境。此外，raw模式意味着你直接操作IP和UDP层的数据，可能会涉及到网络安全限制，例如防火墙过滤。在生产环境中，建议使用适当的安全措施。

相关问题

基于 socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL)，UDP发送和接收，设定接收指定mac的数据。

好的，基于 socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL)) 的程序可以实现对网络数据的抓包和发送，可以通过指定接口名称或接口索引来选择抓取的网络接口，可以设置过滤规则来过滤不需要的数据包。下面是一个基于 socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL)) 的程序示例，实现了UDP发送和接收，并可以设定接收指定MAC地址的数据包：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <netinet/udp.h>

#define BUF_SIZE 65536

int main(int argc, char *argv[]) {
    char *ifname;
    int sockfd;
    char buf[BUF_SIZE];
    struct sockaddr_ll sll;
    struct ifreq ifr;
    struct ethhdr *eth;
    struct iphdr *ip;
    struct udphdr *udp;
    int len;

    if (argc < 2) {
        printf("Usage: %s <interface>\n", argv[0]);
        return -1;
    }
    ifname = argv[1];

    sockfd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
    if (sockfd < 0) {
        perror("socket error");
        return -1;
    }

    memset(&sll, 0, sizeof(sll));
    memset(&ifr, 0, sizeof(ifr));
    strncpy(ifr.ifr_name, ifname, IFNAMSIZ - 1);
    if (ioctl(sockfd, SIOCGIFINDEX, &ifr) < 0) {
        perror("ioctl error");
        close(sockfd);
        return -1;
    }
    sll.sll_family = PF_PACKET;
    sll.sll_ifindex = ifr.ifr_ifindex;
    sll.sll_protocol = htons(ETH_P_ALL);
    if (bind(sockfd, (struct sockaddr *)&sll, sizeof(sll)) < 0) {
        perror("bind error");
        close(sockfd);
        return -1;
    }

    while (1) {
        len = recv(sockfd, buf, BUF_SIZE, 0);
        if (len < 0) {
            perror("recv error");
            break;
        }

        eth = (struct ethhdr *)buf;
        if (eth->h_proto != htons(ETH_P_IP)) {
            continue;
        }

        ip = (struct iphdr *)(buf + sizeof(struct ethhdr));
        if (ip->protocol != IPPROTO_UDP) {
            continue;
        }

        udp = (struct udphdr *)(buf + sizeof(struct ethhdr) + sizeof(struct iphdr));
        if (ntohs(udp->dest) != 1234) { // 接收指定端口的数据包
            continue;
        }

        printf("Received UDP packet from %s:%d to %s:%d\n",
               inet_ntoa(*(struct in_addr *)&ip->saddr), ntohs(udp->source),
               inet_ntoa(*(struct in_addr *)&ip->daddr), ntohs(udp->dest));

        // 发送UDP数据包
        memset(buf, 0, BUF_SIZE);
        eth = (struct ethhdr *)buf;
        memcpy(eth->h_source, "\x00\x11\x22\x33\x44\x55", ETH_ALEN);
        memcpy(eth->h_dest, "\x00\x11\x22\x33\x44\x66", ETH_ALEN);
        eth->h_proto = htons(ETH_P_IP);

        ip = (struct iphdr *)(buf + sizeof(struct ethhdr));
        ip->ihl = 5;
        ip->version = 4;
        ip->tos = 0;
        ip->tot_len = htons(sizeof(struct iphdr) + sizeof(struct udphdr));
        ip->id = htons(12345);
        ip->frag_off = htons(0);
        ip->ttl = 64;
        ip->protocol = IPPROTO_UDP;
        ip->saddr = inet_addr("192.168.1.100");
        ip->daddr = inet_addr("192.168.1.200");
        ip->check = 0;
        ip->check = htons(in_cksum((unsigned short *)ip, sizeof(struct iphdr)));

        udp = (struct udphdr *)(buf + sizeof(struct ethhdr) + sizeof(struct iphdr));
        udp->source = htons(1234);
        udp->dest = htons(5678);
        udp->len = htons(sizeof(struct udphdr));
        udp->check = 0;

        if (send(sockfd, buf, sizeof(struct ethhdr) + sizeof(struct iphdr) + sizeof(struct udphdr), 0) < 0) {
            perror("send error");
            break;
        }
    }

    close(sockfd);
    return 0;
}

在程序中，首先创建一个 socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)) 的原始套接字，然后绑定到指定的网络接口上，通过 recv() 接收数据包，判断数据包是否是 IPv4 协议的 UDP 数据包，判断数据包的目的端口是否是指定端口，然后输出接收到的 UDP 数据包的源 IP 地址和端口号，最后发送一个 UDP 数据包。

注意：这段代码仅作为示例，实际使用中需要根据需求进行修改和优化。

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。