리눅스 소켓프로그래밍 간단한 파일전송 프로그램

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
 
#define MAXSIZE 2048
 
// AF_INET Server
main()
{
	int server_sockfd, client_sockfd;
	int server_len, client_len;
	struct sockaddr_in server_address;
	struct sockaddr_in client_address;
	char ip[128];
	char port[128];
	int filedes, filelen;
	long total;
 
	printf("MyServer#> IP_Address Input : ");
	fgets(ip, 127, stdin);
	ip[strlen(ip)-1] = 0;
	printf("MyServer#> Port Number Input :");
	fgets(port, 127, stdin);
	port[strlen(port)-1] = 0;
 
	/* Create an unnamed socket for the server. */
	server_sockfd = socket(AF_INET, SOCK_STREAM, 0);
 
	server_address.sin_family = AF_INET;
	server_address.sin_addr.s_addr = inet_addr(ip);
	server_address.sin_port = htons(atoi(port));
	server_len = sizeof(server_address);
	bind(server_sockfd, (struct sockaddr *)&server_address, server_len);
 
	listen(server_sockfd, 5);
	client_len = sizeof(client_address);
	client_sockfd = accept(server_sockfd, (struct sockaddr *)&client_address, &client_len);
 
	char filename[256];	
	char buf[MAXSIZE];
	read(client_sockfd, filename, strlen(filename));
	filedes = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
 
	read(client_sockfd, buf, MAXSIZE);
	total = atoi(buf);
	printf("receive file size %ld\n", total);
 
	while((filelen=read(client_sockfd ,buf, MAXSIZE)) > 0)
	{
		filelen = write(filedes, buf, filelen);
 
		if(filelen == MAXSIZE)
		{
			total -= (long)filelen;
			continue;
			printf("receive success %ldpercent\n", total);
		}
		else if(filelen < MAXSIZE)
		{
			total -= (long)filelen;
			if(total <= 0)
			{
				printf("receive success\n");
				break;
			}
			printf("not success receive %ld percent\n", total);
		}
		else if(filelen == -1)
		{
			printf("receive failed\n");
			exit(0);
		}
	}
 
	close(client_sockfd);
	close(filedes);
}

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
 
#define MAXSIZE 2048
 
// AF_INET - Client
main()
{
	int sockfd;
	int len;
	struct sockaddr_in address;
	int result;
	char ip[128];
	char port[128];
    char filename[256];
    char buf[MAXSIZE];
	int filedes, filelen;
	long total;
 
	printf("MyClient#> IP Address Input : ");
	fgets(ip, 127, stdin);
	ip[strlen(ip)-1] = 0;
	printf("MyClient#> Port Number Input : ");
	fgets(port, 127, stdin);
	port[strlen(port)-1] = 0;
 
	sockfd = socket(AF_INET, SOCK_STREAM, 0);
 
	address.sin_family = AF_INET;
	address.sin_addr.s_addr = inet_addr(ip);
	address.sin_port = htons(atoi(port));
	len = sizeof(address);
 
	result = connect(sockfd, (struct sockaddr *)&address, len);
 
	if(result == -1) {
		perror("oops: MyClient");
	}
 
	printf("MyClient#> Filename -> ");
	fgets(filename, 255, stdin);
	filename[strlen(filename)-1] = 0;
	write(sockfd, filename, strlen(filename));
 
	filedes = open(filename, O_RDONLY, 0);
	total = lseek(filedes, 0, SEEK_END);
 
	printf("send filesize %ld \n", total);
    sprintf(buf, "%ld", total);
	write(sockfd, buf, MAXSIZE);
 
	lseek(filedes, 0, SEEK_SET);
	while((filelen = read(filedes, buf, MAXSIZE)) > 0)
	{
		filelen = write(sockfd, buf, filelen);
 
		if(filelen == MAXSIZE)
		{
			total -= (long)filelen;
			if(total <= 0)
			{
				printf("file send success\n");
				filelen = 0;
				break;
			}
			else
			{
				printf("success file send %ldpercent  \n", total);
				continue;
			}
		}
		else if(filelen < MAXSIZE)
		{
			total -= (long)filelen;
			if(total <= 0)
			{
				printf("success\n");
				break;
			}
			printf("not success %d sending %ld percent \n", filelen, total);
		}
		else if(filelen == -1)
		{
			printf("file send failed\n");
			exit(0);
		}
	}
 
	close(sockfd);
	close(filedes);
}