ip = sys.argv[1] port = int(sys.argv[2]) sock_udp = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock_udp.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock_udp.bind((ip, port))
时间: 2023-12-14 21:03:31 浏览: 30
这段代码的作用是创建一个UDP socket,并将其绑定到指定的IP地址和端口号上。具体实现过程如下:
1. 从命令行参数中获取IP地址和端口号,分别赋值给变量ip和port。
2. 创建一个UDP socket,使用socket.socket函数,并指定socket类型为socket.SOCK_DGRAM。
3. 设置socket选项,使用sock_udp.setsockopt函数,将socket的SO_REUSEADDR选项设置为1,表示允许重用地址。
4. 将socket绑定到指定的IP地址和端口号上,使用sock_udp.bind函数,将(ip, port)作为参数传入。
绑定完成后,该socket就可以用于发送和接收UDP数据包了。
相关问题
将下列代码转化为C++代码:import socket def scan_ports(host, start_port, end_port, protocol='tcp'): for port in range(start_port, end_port + 1): try: if protocol == 'tcp': sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(1) # 设置超时时间为1秒 result = sock.connect_ex((host, port)) if result == 0: print(f"Port {port} is open") sock.close() elif protocol == 'udp': sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.settimeout(1) sock.sendto(b'Ping', (host, port)) data, addr = sock.recvfrom(1024) if data: print(f"Port {port} is open") sock.close() else: print(f"Unsupported protocol {protocol}") return except socket.error: pass if __name__ == '__main__': host = '127.0.0.1' # 目标IP地址 start_port = 1 # 起始端口号 end_port = 65535 # 终止端口号 protocols = ['tcp', 'udp'] for protocol in protocols: print(f"Scanning {protocol} ports...") scan_ports(host, start_port, end_port, protocol)
以下是将代码转化为C++的结果:
```cpp
#include <iostream>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
void scan_ports(const char* host, int start_port, int end_port, const char* protocol) {
struct sockaddr_in target;
int result, sock, port;
memset(&target, 0, sizeof(target));
target.sin_family = AF_INET;
target.sin_addr.s_addr = inet_addr(host);
for(port = start_port; port <= end_port; port++) {
try {
if(strcmp(protocol, "tcp") == 0) {
sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sock < 0) {
std::cerr << "Failed to create socket.\n";
exit(1);
}
target.sin_port = htons(port);
struct timeval timeout;
timeout.tv_sec = 1;
timeout.tv_usec = 0;
setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
result = connect(sock, (struct sockaddr*)&target, sizeof(target));
if(result == 0) {
std::cout << "Port " << port << " is open.\n";
}
close(sock);
}
else if(strcmp(protocol, "udp") == 0) {
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(sock < 0) {
std::cerr << "Failed to create socket.\n";
exit(1);
}
target.sin_port = htons(port);
struct timeval timeout;
timeout.tv_sec = 1;
timeout.tv_usec = 0;
setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout));
setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
char buffer[] = "Ping";
result = sendto(sock, buffer, strlen(buffer), 0, (struct sockaddr*)&target, sizeof(target));
if(result < 0) {
std::cerr << "Failed to send data.\n";
exit(1);
}
char recv_buffer[1024];
socklen_t recv_len = sizeof(target);
result = recvfrom(sock, recv_buffer, sizeof(recv_buffer), 0, (struct sockaddr*)&target, &recv_len);
if(result > 0) {
std::cout << "Port " << port << " is open.\n";
}
close(sock);
}
else {
std::cerr << "Unsupported protocol " << protocol << "\n";
exit(1);
}
}
catch(...) {
continue;
}
}
}
int main(int argc, char** argv) {
const char* host = "127.0.0.1";
int start_port = 1;
int end_port = 65535;
const char* protocols[] = {"tcp", "udp"};
int i, num_protocols = sizeof(protocols) / sizeof(protocols[0]);
for(i = 0; i < num_protocols; i++) {
std::cout << "Scanning " << protocols[i] << " ports...\n";
scan_ports(host, start_port, end_port, protocols[i]);
}
return 0;
}
```
linux c语言udp socket发送信息到192.168.1.1并打印地址和端口
好的,以下是一个简单的示例代码,可以实现你想要的功能:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define SERVER_IP "192.168.1.1" // 目标IP地址
#define SERVER_PORT 12345 // 目标端口号
int main(int argc, char *argv[]) {
int sockfd;
struct sockaddr_in server_addr;
char send_buf[1024] = "Hello, server!";
// 创建UDP socket
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("socket");
exit(EXIT_FAILURE);
}
// 设置目标地址和端口
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = inet_addr(SERVER_IP);
server_addr.sin_port = htons(SERVER_PORT);
// 发送数据
if (sendto(sockfd, send_buf, strlen(send_buf), 0, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
perror("sendto");
exit(EXIT_FAILURE);
}
// 打印目标地址和端口
printf("Send message to %s:%d\n", inet_ntoa(server_addr.sin_addr), ntohs(server_addr.sin_port));
// 关闭socket
close(sockfd);
return 0;
}
```
这个示例代码使用了 Linux 的 socket API,创建了一个 UDP socket,并向指定的 IP 地址和端口号发送了一段消息。同时,还打印了目标地址和端口号。你可以根据自己的需求进行修改和扩展。