GoDaddy VPS上的UDP服务器
[英]UDP Server on GoDaddy VPS
问题描述
我正在尝试在GoDaddy VPS（运行CENTOS 6.8 x86_64 virtuozzo）上运行UDP服务器，并通过NodeJS从本地计算机（运行OS X的Macbook Air）与所述UDP端口通信。 当我在本地计算机上运行服务器并连接NodeJS应用程序时，一切正常。 但是，将服务器上传到VPS并使用g++ -O2 main.cpp编译后，它似乎运行良好，但是它没有收到任何消息，也没有像在我的设备上那样将任何数据回显到NodeJS发送方。本地机器。 我试图多次更改服务器上的端口。 TCP服务器在我的VPS上似乎运行良好。
这是我的服务器代码：
#define PLATFORM_WINDOWS 1
#define PLATFORM_MAC 2
#define PLATFORM_LINUX 3
#include <iostream>
using std::cout;
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#if defined(_WIN32)
#define PLATFORM PLATFORM_WINDOWS
#elif defined(__APPLE__)
#define PLATFORM PLATFORM_MAC
#else
#define PLATFORM PLATFORM_LINUX
#endif
#if PLATFORM == PLATFORM_WINDOWS
#include <winsock2.h>
#elif PLATFORM == PLATFORM_MAC || PLATFORM == PLATFORM_LINUX
#include <sys/socket.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <arpa/inet.h>
#endif
#if PLATFORM == PLATFORM_WINDOWS
#pragma comment(lib,"ws2_32.lib")
#endif
#define PORTNUM 15000
#define BUFMAX 1024
#if PLATFORM == PLATFORM_MAC || PLATFORM == PLATFORM_LINUX
void macLinuxEchoLoop(int, struct sockaddr*, socklen_t);
void macLinuxEchoServer();
#endif
#if PLATFORM == PLATFORM_WINDOWS
void windowsEchoLoop(SOCKET, sockaddr*, size_t);
int windowsEchoServer();
#endif
int main(int argc, char** argv)
{
#if PLATFORM == PLATFORM_WINDOWS
windowsEchoServer();
#else
macLinuxEchoServer();
#endif
puts("Press any key to continue");
getc(stdin);
return EXIT_SUCCESS;
}
#if PLATFORM == PLATFORM_MAC || PLATFORM == PLATFORM_LINUX
void macLinuxEchoServer()
{
int socketFileDescriptor;
struct sockaddr_in serverAddr;
struct sockaddr_in clientAddr;
int bindRet;
socketFileDescriptor = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
bzero(&serverAddr, sizeof(serverAddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
serverAddr.sin_port = htons(PORTNUM);
bindRet = bind(socketFileDescriptor, (struct sockaddr*)& serverAddr, sizeof(serverAddr));
cout << bindRet;
macLinuxEchoLoop(socketFileDescriptor, (struct sockaddr*)& clientAddr, sizeof(clientAddr));
}
void macLinuxEchoLoop(int sockFd, struct sockaddr* cliaddr, socklen_t clilen)
{
int bytesRead;
socklen_t len;
char msg[BUFMAX] = {0};
printf("Waiting for datagrams on 127.0.0.1:%d\n", PORTNUM);
for(;;)
{
len = clilen;
bzero(&msg, sizeof(msg));
bytesRead = recvfrom(sockFd, msg, BUFMAX, 0, cliaddr, &len);
printf("Got message: %s\n", msg);
sendto(sockFd, msg, bytesRead, 0, cliaddr, len);
}
}
#endif
#if PLATFORM == PLATFORM_WINDOWS
int windowsEchoServer()
{
SOCKET sock;
sockaddr_in serverAddr;
sockaddr_in clientAddr;
WSADATA wsaDat;
int wsaError = WSAStartup( MAKEWORD(2,2), &wsaDat );
if(!wsaError)
{
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
ZeroMemory(&serverAddr, sizeof(serverAddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
serverAddr.sin_port = htons(PORTNUM);
bind(sock, (struct sockaddr*)& serverAddr, sizeof(serverAddr));
windowsEchoLoop(sock, (struct sockaddr*)& clientAddr, sizeof(clientAddr));
}
else
{
return EXIT_FAILURE;
}
}
void windowsEchoLoop(SOCKET sock, sockaddr* cliaddr, size_t clilen)
{
int bytesRead;
int len;
char msg[BUFMAX] = {0};
printf("Waiting for datagrams on 127.0.0.1:%d\n", PORTNUM);
for(;;)
{
len = clilen;
ZeroMemory(&msg, sizeof(msg));
bytesRead = recvfrom(sock, msg, BUFMAX, 0, cliaddr, &len);
printf("Got message: %s\n", msg);
sendto(sock, msg, bytesRead, 0, cliaddr, len);
}
}
#endif
这是我的NodeJS脚本，我尝试使用该脚本向UDP服务器发送消息：
var dgram = require('dgram');
var server_socket = dgram.createSocket('udp4');
server_socket.on('message', function(msg, rinfo) {
message = new Buffer('Server Says: ' + msg.toString());
//server_socket.send(message,0,message.length,rinfo.port,rinfo.address);
console.log('Datagram details');
console.dir(rinfo);
});
process.on('SIGINT',function(){
server_socket.close();
});
server_socket.on('close',function(){
console.log('Server Closed');
process.exit();
});
server_socket.bind('3001', 'localhost');
message = new Buffer('Hello fro NodeJS!');
server_socket.send(message,0,message.length,'15000','MY_VPS_IP_HERE');
MY_VPS_HERE替换为GoDaddy VPS的IP地址。
我在服务器上运行了iptables -I INPUT -p udp -j ACCEPT ，以确保它接受所有UDP数据。
netstat -l结果：
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 *:idware-router *:* LISTEN
tcp 0 0 *:autodesk-nlm *:* LISTEN
tcp 0 0 *:imaps *:* LISTEN
tcp 0 0 *:infowave *:* LISTEN
tcp 0 0 *:radsec *:* LISTEN
tcp 0 0 *:pop3s *:* LISTEN
tcp 0 0 *:gnunet *:* LISTEN
tcp 0 0 *:eli *:* LISTEN
tcp 0 0 *:mysql *:* LISTEN
tcp 0 0 *:submission *:* LISTEN
tcp 0 0 *:pop3 *:* LISTEN
tcp 0 0 *:nbx-ser *:* LISTEN
tcp 0 0 localhost.localdomain:783 *:* LISTEN
tcp 0 0 *:imap *:* LISTEN
tcp 0 0 *:nbx-dir *:* LISTEN
tcp 0 0 *:http *:* LISTEN
tcp 0 0 *:urd *:* LISTEN
tcp 0 0 *:ftp *:* LISTEN
tcp 0 0 s192-169-180-198.sec:domain *:* LISTEN
tcp 0 0 10.198.9.181:domain *:* LISTEN
tcp 0 0 localhost.localdomai:domain *:* LISTEN
tcp 0 0 *:ssh *:* LISTEN
tcp 0 0 *:smtp *:* LISTEN
tcp 0 0 localhost.localdomain:rndc *:* LISTEN
tcp 0 0 *:https *:* LISTEN
tcp 0 0 *:tsrmagt *:* LISTEN
tcp 0 0 *:tpcsrvr *:* LISTEN
udp 0 0 *:hydap *:*
udp 0 0 s192-169-180-198.secu:domain *:*
udp 0 0 10.198.9.181:domain *:*
udp 0 0 localhost.localdomain:domain *:*
Active UNIX domain sockets (only servers)
Proto RefCnt Flags Type State I-Node Path
unix 2 [ ACC ] STREAM LISTENING 786547501 /var/run/dovecot/indexer-worker
unix 2 [ ACC ] STREAM LISTENING 786547505 /var/run/dovecot/indexer
unix 2 [ ACC ] STREAM LISTENING 786547507 /var/run/dovecot/login/imap
unix 2 [ ACC ] STREAM LISTENING 786547511 /var/run/dovecot/imap-master
unix 2 [ ACC ] STREAM LISTENING 786547515 /var/run/dovecot/imap-urlauth-worker
unix 2 [ ACC ] STREAM LISTENING 786547517 /var/run/dovecot/token-login/imap-urlauth
unix 2 [ ACC ] STREAM LISTENING 786547521 /var/run/dovecot/imap-urlauth
unix 2 [ ACC ] STREAM LISTENING 786547527 /var/run/dovecot/imap-hibernate
unix 2 [ ACC ] STREAM LISTENING 786547531 /var/run/dovecot/doveadm-server
unix 2 [ ACC ] STREAM LISTENING 786547535 /var/run/dovecot/dns-client
unix 2 [ ACC ] STREAM LISTENING 786547539 /var/run/dovecot/director-admin
unix 2 [ ACC ] STREAM LISTENING 786547543 /var/run/dovecot/dict
unix 2 [ ACC ] STREAM LISTENING 786547547 /var/run/dovecot/dict-async
unix 2 [ ACC ] STREAM LISTENING 786547551 /var/run/dovecot/config
unix 2 [ ACC ] STREAM LISTENING 786547553 /var/run/dovecot/login/login
unix 2 [ ACC ] STREAM LISTENING 786547555 /var/run/dovecot/token-login/tokenlogin
unix 2 [ ACC ] STREAM LISTENING 786547559 /var/run/dovecot/auth-login
unix 2 [ ACC ] STREAM LISTENING 786547563 /var/run/dovecot/auth-client
unix 2 [ ACC ] STREAM LISTENING 786547567 /var/run/dovecot/auth-userdb
unix 2 [ ACC ] STREAM LISTENING 786547571 /var/run/dovecot/auth-master
unix 2 [ ACC ] STREAM LISTENING 786547575 /var/run/dovecot/auth-worker
unix 2 [ ACC ] STREAM LISTENING 786547589 /var/run/dovecot/quota-status
unix 2 [ ACC ] STREAM LISTENING 786547592 /var/run/dovecot/master
unix 2 [ ACC ] STREAM LISTENING 786580200 /usr/local/cpanel/var/cpwrapd.sock
unix 2 [ ACC ] STREAM LISTENING 786580202 /usr/local/cpanel/var/cpauthd.sock
unix 2 [ ACC ] STREAM LISTENING 1414233375 @/com/ubuntu/upstart
unix 2 [ ACC ] STREAM LISTENING 786547581 /var/run/dovecot/anvil
unix 2 [ ACC ] STREAM LISTENING 3006621825 /var/lib/mysql/mysql.sock
unix 2 [ ACC ] STREAM LISTENING 786583027 /var/run/cphulkd.sock
unix 2 [ ACC ] STREAM LISTENING 786580952 /var/cpanel/dnsadmin/sock
unix 2 [ ACC ] STREAM LISTENING 786547585 /var/run/dovecot/anvil-auth-penalty
unix 2 [ ACC ] STREAM LISTENING 786580204 /usr/local/cpanel/var/cpdoveauthd.sock
unix 2 [ ACC ] STREAM LISTENING 1414242689 /var/run/saslauthd/mux
unix 2 [ ACC ] STREAM LISTENING 786547462 /var/run/dovecot/stats
unix 2 [ ACC ] STREAM LISTENING 786547468 /var/run/dovecot/ssl-params
unix 2 [ ACC ] STREAM LISTENING 786547470 /var/run/dovecot/login/ssl-params
unix 2 [ ACC ] STREAM LISTENING 786547474 /var/run/dovecot/replicator
unix 2 [ ACC ] STREAM LISTENING 786547478 /var/run/dovecot/replication-notify
unix 2 [ ACC ] STREAM LISTENING 3006633856 /var/run/ftpd.sock
unix 2 [ ACC ] STREAM LISTENING 786547481 /var/run/dovecot/login/pop3
unix 2 [ ACC ] STREAM LISTENING 786547487 /var/run/dovecot/log-errors
unix 2 [ ACC ] STREAM LISTENING 786547491 /var/run/dovecot/lmtp
unix 2 [ ACC ] STREAM LISTENING 786547495 /var/run/dovecot/ipc
unix 2 [ ACC ] STREAM LISTENING 786547497 /var/run/dovecot/login/ipc-proxy
1 个解决方案
解决方案1
0 已采纳 2017-01-08 22:23:20
服务器或VPS都是问题。 该问题与尝试在发送消息之前将NodeJS服务器中的UDP套接字绑定到本地计算机上的特定端口有关。 我假设OS X希望选择从远程主机接收传入UDP消息的端口。 我做了一点我认为不起作用的微小更改，但是至少值得注意的是-我更改了server_socket.send(message,0,message.length,'15000','MY_VPS_IP_HERE'); 到server_socket.send(message,0,message.length,15000,'MY_VPS_IP_HERE'); （删除了“ 15000”附近的引号）
这是我完整修改过的NodeJS UDP客户端代码：
var dgram = require('dgram');
var server_socket = dgram.createSocket('udp4');
server_socket.on('message', function(msg, rinfo) {
message = new Buffer('Server Says: ' + msg.toString());
//server_socket.send(message,0,message.length,rinfo.port,rinfo.address);
console.log('Datagram details');
console.dir(rinfo);
});
process.on('SIGINT',function(){
server_socket.close();
});
server_socket.on('close',function(){
console.log('Server Closed');
process.exit();
});
//var bindRet = server_socket.bind('3001', 'localhost');
//var bindRet = server_socket.bind(7000);
//console.log('Bind result: ' + bindRet);
message = new Buffer('Hello from NodeJS!');
server_socket.send(message,0,message.length,15000,'MY_VPS_IP_HERE');
可扩展的UDP服务器
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.