我的客户端和服务器之间的TCP/IP连接无法正常工作。
这是服务器代码-
int main() {
int servSock; /* Socket descriptor for server */
int clntSock; /* Socket descriptor for client */
unsigned short echoServPort; /* Server port */
struct sockaddr_in echoServAddr; /* Local address */
struct sockaddr_in echoClntAddr; /* Local address */
pid_t processID; /* Process ID from fork()*/
unsigned int childProcCount = 0; /* Number of child processes */
unsigned int clntLen;
unsigned int recvMsgSize;
echoServPort = 22;
if ((servSock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){
printf("Socket failed");
}
echoServAddr.sin_family = AF_INET; //Internet address family
echoServAddr.sin_addr.s_addr = htonl(INADDR_ANY); //Any incoming interface
echoServAddr.sin_port = htons(echoServPort); // Local port
if (bind(servSock, (struct sockaddr *) &echoServAddr, sizeof(echoServAddr)) < 0){
printf("bind failed");
}
if (listen(servSock, MAXPENDING) < 0){
printf("listen() failed");
}
clntLen = sizeof(echoClntAddr);
if ((clntSock=accept(servSock,(struct sockaddr *)&echoClntAddr,&clntLen))<0){
printf("accept() failed");
}
if ((recvMsgSize = recv(clntSock, buf, 1024, 0)) < 0){
printf("recv() failed");
}
/* Send received string and receive again until end of transmission */
while (recvMsgSize > 0) { /* zero indicates end of transmission */
printf("%d", recvMsgSize);
if (send(clntSock, buf, recvMsgSize, 0) != recvMsgSize){
//printf(“send() failed”);
}
if ((recvMsgSize = recv(clntSock, buf, 1024, 0)) < 0){
//printf(“recv() failed”);
}
}
sleep(60);
}
}
return EXIT_SUCCESS;
}
以及客户机代码，这是一个CGI应用程序。
int main(void) {
int servSock; /* Socket descriptor for server */
int clntSock; /* Socket descriptor for client */
unsigned short echoServPort; /* Server port */
struct sockaddr_in echoServAddr; /* Local address */
struct sockaddr_in echoClntAddr; /* Local address */
struct sockaddr_in {
__uint8_t sin_len;
sa_family_t sin_family;
in_port_t sin_port;
struct in_addr sin_addr;
char sin_zero[8];
};
/*pid_t processID; Process ID from fork()
unsigned int childProcCount = 0; Number of child processes
unsigned int clntLen;*/
//char echoservIP = "10.0.0.2";
printf("Content-type: text/html\n\n");
puts("<HTML>");
puts("<BODY>");
echoServPort = 22;
servSock = 22;
clntSock = 22;
puts("<br>");
if ((clntSock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){
printf("socket() failed");
}
echoServAddr.sin_family = AF_INET; //Internet address family
echoServAddr.sin_addr.s_addr = inet_addr("10.0.0.2"); //Server IP address
echoServAddr.sin_port = htons(echoServPort); //Server port
echoClntAddr.sin_addr.s_addr = inet_addr("10.0.0.1");
if (connect(clntSock, (struct sockaddr *) &echoServAddr, sizeof(echoServAddr)) < 0){
printf("connect() failed\n");
}
int clntLen;
clntLen = sizeof(echoClntAddr);
if ((clntSock=accept(servSock,(struct sockaddr *)&echoClntAddr,&clntLen))<0){
printf("accept() failed\n");
}
char echoString[4] = "helo";
int echoStringLen;
echoStringLen = strlen(echoString); //Determine input length
//Send the string to the server
if (send(clntSock, echoString, echoStringLen, 0) != echoStringLen){
printf("send() sent a different number of bytes than expected");
}
puts("<p>Hello <b>CGI</b</p>");
puts("</BODY>");
puts("</HTML>");
return EXIT_SUCCESS;
}
调试时，问题出现在该行的客户端上。
if ((clntSock=accept(servSock,(struct sockaddr
*)&echoClntAddr,&clntLen))<0){
printf("accept() failed\n");
}
及AT
if(send(clntSock, echoString, echoStringLen, 0) != echoStringLen){
printf("send() sent a different number of bytes than expected");
}
我得到输出
<HTML>
<BODY>
<br>
accept() failed
send() sent a different number of bytes than expected<p>Hello
<b>CGI</b</p>
需要帮助解决此问题！，谢谢。
最佳答案
你不需要在客户端上调用accept()-你只需要连接。
和
char echoString[4] = "helo";
是错误的。它没有被终止。就这么做吧
char echoString[] = "helo";
关于c - C中的TCP/IP无法正常工作，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/29864223/