socket example 1

TCP IP

socket example 1

개발자_이훈규 2015. 4. 22. 03:13

소켓통신에 대한 코드를 다른 블로그에서 본 후에 약간 수정을 하였습니다.

( 출처 :http://blog.naver.com/hanhi95/220317030958 )

socketServer.c

/*
 *
 * http://blog.naver.com/hanhi95/220317030958
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <fcntl.h>

#define BUF_SIZE 100

void error_handling(char *message);

int main(int argc, char *argv[]) {

int serv_sock;
    int clnt_sock;

struct sockaddr_in serv_addr;
    struct sockaddr_in clnt_addr;
    socklen_t clnt_addr_size;
    int fd;
    //char buf[BUF_SIZE] = {'\0', };
    char buf[BUF_SIZE];

memset(buf, 0, sizeof(buf));

fd = open(argv[1], O_RDONLY);
    if (fd == -1)
        error_handling("open() error!");

if (read(fd, buf, sizeof(buf)) == -1)
        error_handling("read() error!");
    close(fd);

if (argc != 3) {
        printf("Usage : %s<txt> <port>\n", argv[0]);
        exit(1);
    }

serv_sock = socket(PF_INET, SOCK_STREAM, 0);
    if (serv_sock == -1)
        error_handling("Socket() error");

memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(atoi(argv[2]));

if (bind(serv_sock, (struct sockaddr*) &serv_addr, sizeof(serv_addr)) == -1)
        error_handling("bind() error");

if (listen(serv_sock, 5) == -1)
        error_handling("listen() error");

clnt_addr_size = sizeof(clnt_addr);
    clnt_sock = accept(serv_sock, (struct sockaddr*) &clnt_addr, &clnt_addr_size);
    if (clnt_sock == -1)
        error_handling("accept() error");

write(clnt_sock, buf, sizeof(buf));

close(clnt_sock);
    close(serv_sock);

return 0;
}

void error_handling(char *message) {
    fputs(message, stderr);
    fputc('\n', stderr);
    exit(1);
}

socketClient.c

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

#define BUF_SIZE 100

void error_handling(char *message);

int main(int argc, char *argv[]) {

int sock;
    struct sockaddr_in serv_addr;
    char message[BUF_SIZE];
    //char message[10];
    int str_len;
    int fd;
    if (argc != 4) {
        printf("Usage : %s<txt> <IP> <port \n", argv[0]);
        exit(1);
    }

sock = socket(PF_INET, SOCK_STREAM, 0);
    if (sock == -1)
        error_handling("socket() error");

memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = inet_addr(argv[2]);
    serv_addr.sin_port = htons(atoi(argv[3]));

if (connect(sock, (struct sockaddr*) &serv_addr, sizeof(serv_addr)) == -1)
        error_handling("connet() error!");

str_len = read(sock, message, sizeof(message));

if (str_len == -1)
        error_handling("read() error!");

printf("message from server\n%s", message);
    printf("%d\n", sizeof(message));
    printf("%d\n", strlen(message));

fd = open(argv[1], O_CREAT | O_WRONLY | O_TRUNC);
    if (fd == -1 )
        error_handling("open() error!");
    if (write(fd, message, strlen(message)*sizeof(char)) == -1)
        error_handling("write() error!");
    close(fd);

close(sock);

return 0;
}

void error_handling(char *message) {
    fputs(message, stderr);
    fputc('\n', stderr);
    exit(1);
}

폴더에 파일과 컴파일 방법, 사용방법(readme.txt)를 첨부해놨습니다.

socket.tar.gz

압축 해제하는 방법

$ tar -xvzf socket.tar.gz

저작자표시 비영리 (새창열림)