[英]My TCP socket server not sending and receiving
我正在嘗試為客戶端編寫 TCP 套接字服務器,然后我遇到了一些問題。 服務器沒有發送/接收數據。 但是,它可以傾聽並接受新客戶。
我試過“nc 127.0.0.1 -l 10001”來測試客戶端,它運行良好。 服務器一次可以發送和接收但編碼的字符。 我做了一些修改,從那以后我一直看到錯誤。
退出消息可以被注釋或刪除,因為它是在 custom.h 中聲明的。
任何想法將不勝感激。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include "custom.h"
#define PORT 10001
#define MAXIMUM_CONNECTION 20
#define DATA_SIZE 100
int main()
{
int sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
struct sockaddr_in serverAddr, clientAddr;
memset(&serverAddr, '\0', sizeof(serverAddr));
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(PORT);
serverAddr.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(sock, (struct sockaddr *) &serverAddr, sizeof(serverAddr)) < 0) {
exitMessage("Failed to address to port");
}
if(listen(sock, MAXIMUM_CONNECTION) < 0) {
exitMessage("Server is deaf could not listen to incoming messages");
}
char buffer[DATA_SIZE], data[DATA_SIZE];
while(1) {
memset(buffer, '\0', DATA_SIZE);
memset(data, '\0', DATA_SIZE);
socklen_t clientAddrSize = sizeof(clientAddr);
if(accept(sock, (struct sockaddr *) &clientAddr, &clientAddrSize) < 0) {
exitMessage("Could not accept new connections");
}
if(recv(sock, buffer, DATA_SIZE - 1, 0) < 0) {
exitMessage("Failed to receive data from client");
}
printf("\nReceived: \'%s\' to client\n", buffer);
printf("input data for client: ");
int index = 0;
while((data[index++] = getchar()) != '\n');
if(send(sock, data, strlen(data), 0) < 0) {
exitMessage("Failed sending to client");
}
}
}
您監聽的套接字僅用於接受新連接,而不是讀/寫數據。 accept
函數返回已接受套接字的文件描述符。 那是您應該調用recv
並send
那個。
int newsock;
if((newsock = accept(sock, (struct sockaddr *) &clientAddr, &clientAddrSize)) < 0) {
exitMessage("Could not accept new connections");
}
if(recv(newsock, buffer, DATA_SIZE - 1, 0) < 0) {
exitMessage("Failed to receive data from client");
}
printf("\nReceived: \'%s\' to client\n", buffer);
printf("input data for client: ");
int index = 0;
while((data[index++] = getchar()) != '\n');
if(send(newsock, data, strlen(data), 0) < 0) {
exitMessage("Failed sending to client");
}
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