프로그래밍

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anf777

리눅스 프로그래밍 질문입니다.(에코 서버/클라이언트)

http://www.hackerschool.org/HS_Boards/zboard.php?id=QNA_programming&no=957 [복사]

리눅스에서 sip를 이용한 채팅 프로그램을 만들려고 하는데요...
sip는 접어두고 먼저 간단한 에코 프로그램을 만들어보려고 하는데...
그게 잘 안 되네요...
서버파일을 컴파일하고 실행 시키면 서버는 가만히 기다려야 하는데...
클라이언트한테 메세지를 받은것처럼 문자(클라이언트 ip가 출력되게 해놨음)를 출력하고 종료됩니다.
학교 서버에서랑 제 컴퓨터에 vmware 깔아서 해봤는데 둘다 그러네요...
소스 올려놓을 테니 고수님들 친절한 답변 부탁드립니다.
///////////////////////////////////////////////////////
서버소스
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define MAXPENDING 5
#define RCVBUFSIZE 32

void DieWithError(char * errorMessage);
void HandleTCPClient(int clntSocket);

int main(int argc, char * argv[])
{
        int servSock;
        int clntSock;
        struct sockaddr_in echoServAddr;
        struct sockaddr_in echoClntAddr;
        unsigned short echoServPort;
        unsigned int clntLen;

        if (argc != 2)
        {
                fprintf(stderr, "Usage: %s <Server Port>/n", argv[0]);
                exit(1);
        }

        echoServPort = atoi(argv[1]);

        if ((servSock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
                DieWithError("socket() failed");

        memset(&echoServAddr, 0, sizeof(echoServAddr));

        echoServAddr.sin_family = AF_INET;
        echoServAddr.sin_addr.s_addr = htons(INADDR_ANY);
        echoServAddr.sin_port = htons(echoServPort);

        if (bind(servSock, (struct sockaddr *) &echoServAddr, sizeof(echoServAddr)) <0)

        if(listen(servSock, MAXPENDING) < 0)
                DieWithError("listen() failed");

        for (;;)
        {
                clntLen = sizeof(echoClntAddr);

                if ((clntSock = accept(servSock, (struct sockaddr *) &echoClntAddr, &clntLen)) <0)

                printf("Handing client %s\n", inet_ntoa(echoClntAddr.sin_addr));
                HandleTCPClient(clntSock);
        }
}

void DieWithError(char * errorMessage)
{
        perror(errorMessage);
        exit(1);
}

void HandleTCPClient(int clntSocket)
{
        char echoBuffer[RCVBUFSIZE];
        int recvMsgSize;

        if ((recvMsgSize = recv(clntSocket, echoBuffer, RCVBUFSIZE, 0)) < 0)
                DieWithError("recv() failed");

        while (recvMsgSize > 0)
        {
                if (send(clntSocket, echoBuffer, recvMsgSize, 0) != recvMsgSize)
                        DieWithError("send() failed");

                if ((recvMsgSize = recv(clntSocket, echoBuffer, RCVBUFSIZE, 0)) < 0)
                        DieWithError("recv() failed");
        }

        close(clntSocket);
}

///////////////////////////////////////////////////////
클라이언트 소스
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define RCVBUFSIZE 32

void DieWithError(char * errorMessage);

int main(int argc, char * argv[])
{
        int sock;
        struct sockaddr_in echoServAddr;
        unsigned short echoServPort;
        char * servIP;
        char * echoString;
        char echoBuffer[RCVBUFSIZE];
        unsigned int echoStringLen;
        int bytesRcvd, totalBytesRcvd;

        if((argc<3) || (argc>4))
        {
                fprintf(stderr, "Usage: %s <Server IP> <Echo Word> [<Echo Port>]\n", argv[0]);
                exit(1);
        }

        servIP = argv[1];
        echoString = argv[2];

        if(argc==4) echoServPort = atoi(argv[3]);
        else echoServPort = 7;

        if((sock=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
                DieWithError("socket() failed");

        memset(&echoServAddr, 0, sizeof(echoServAddr));
        echoServAddr.sin_family = AF_INET;
        echoServAddr.sin_addr.s_addr = inet_addr(servIP);
        echoServAddr.sin_port = htons(echoServPort);

        if(connect(sock, (struct sockaddr *) &echoServAddr, sizeof(echoServAddr)) < 0)
                DieWithError("connect() failed");
        echoStringLen = strlen(echoString);

        if(send(sock, echoString, echoStringLen, 0) != echoStringLen)
                DieWithError("send() sent a different number of bytes than expected");

        totalBytesRcvd = 0;
        printf("Received: ");
        while (totalBytesRcvd < echoStringLen)
        {
                if((bytesRcvd = recv(sock, echoBuffer, RCVBUFSIZE -1, 0)) <= 0)
                        DieWithError("recv() failed or connection closed prematurely");
                totalBytesRcvd += bytesRcvd;
                echoBuffer[bytesRcvd] = '\0';
                printf(echoBuffer);
        }
        printf("\n");

        close(sock);
        exit(0);

}

void DieWithError(char * errorMessage)
{
        perror(errorMessage);
        exit(1);
}

Hit : 4092 Date : 2005/12/03 11:39