Linux socket receive file

最新推荐文章于 2023-05-06 16:54:22 发布

转载最新推荐文章于 2023-05-06 16:54:22 发布 · 985 阅读

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本文详细阐述了如何使用C语言实现基于TCP/IP协议的文件接收与下载服务，包括socket编程、多线程处理和文件读写操作。

/**********************

receive file

*****************************/

#include <sys/types.h>
#include <sys/socket.h>
#include <strings.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#define MAXLEN 1024
#define DOWNLOAD_PATH  "./download"

struct file_info
{
        int size;
        char name[32];
};


void usage(void)
{
        printf("usage: commad <port> \n");
        exit(-1);
}


int main(int argc, char *argv[])
{
	int recv_fd = -1;
	int file_fd = -1;
	int new_fd = -1;
	int num = -1;
	int ret = -1;
	int on = 1;
	int left = 0;
	struct sockaddr_in self_addr;
	struct sockaddr_in peer_addr;
	int peer_len = sizeof(peer_addr);
	char recv_buf[MAXLEN];
	char save_path[128];

	if(argc != 2)
		usage();

	recv_fd = socket(AF_INET, SOCK_STREAM, 0);
	if(recv_fd < 0)
	{
		perror("socket");
		exit(1);
	}
	
	ret = setsockopt(recv_fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
	if(ret < 0)
	{
		perror("setsockopt");
		exit(1);
	}

	memset(&self_addr, 0 , sizeof(self_addr));
	memset(&peer_addr, 0 , sizeof(peer_addr));
	self_addr.sin_family = AF_INET;
	self_addr.sin_port = htons(atoi(argv[1]));
	self_addr.sin_addr.s_addr = htonl(INADDR_ANY);
	ret = bind(recv_fd, (struct sockaddr *)&self_addr, sizeof(self_addr));
	if(ret < 0)
	{
		perror("bind");
		exit(1);
	}
	
	listen(recv_fd, 5);

	new_fd = accept(recv_fd, (struct sockaddr *)&peer_addr, &peer_len);

	struct file_info node;
	num = read(new_fd, &node, sizeof(node));
	
	left = ntohl(node.size);
	sprintf(save_path, "%s/%s", DOWNLOAD_PATH, node.name);
	printf("save_path = %s\n", save_path);
	file_fd = open(save_path, O_CREAT | O_APPEND | O_RDWR, 0777);
	if(file_fd < 0)
	{
		perror("open");
		exit(1);
	}
	
	while(1)
	{
		num = read(new_fd, recv_buf, MAXLEN);
		printf("left = %d, num = %d\n", left, num);
		if(left == 0)
			break;
		write(file_fd, recv_buf, num);
		left -= num;
	}

	close(file_fd);
	close(new_fd);
	close(recv_fd);
		
	return 0;
}