client.c

在Linux环境下采用socket机构实现通信。 用户可以自己建立文档来测试。内附说明。

#include "sockcom.h"

int initSocket(char *rhost) {
	int sockfd;
	struct sockaddr_in server;
	struct hostent *hp, *gethostbyname();
	sockfd = socket(AF_INET, SOCK_STREAM, 0);
	if (sockfd<0) error("Error opening stream socket.");
	if ((hp=gethostbyname(rhost))==NULL) error("%s Unknow host.", rhost);
	server.sin_family = AF_INET;
	bcopy((char *)hp->h_addr, (char *)&server.sin_addr.s_addr, hp->h_length);
	server.sin_port=htons(PORT);
	if(connect(sockfd, (struct sockaddr *)&server, sizeof(server))<0)
		error("Error connect to remote server." );
	return sockfd;
}

int main(int argc, char *argv[])
{
	if (argc!=4) {
		error("Usage: client file1 remotehost file2");
	}
	printf("%s %s %s %s\n", argv[0], argv[1], argv[2], argv[3]);
	int n;
	char buf[BUFSIZE];
	char *filename = argv[1];
	FILEINFO fileinfo;
	strcpy(fileinfo.fname, argv[3]);
	int fd = open(filename, O_RDONLY);
	fileinfo.length = lseek(fd,0L,SEEK_END);
	printf("Filename: %s, length: %d\n", fileinfo.fname, fileinfo.length);
	int sockfd=initSocket(argv[2]);
	if(write(sockfd, &fileinfo, sizeof(fileinfo))<0) error("Error sending metadata.");
	lseek(fd, 0L, SEEK_SET);
	while((n=read(fd, buf, BUFSIZE))>0) {
		write(sockfd, buf, n);
	}
	close(fd);
	printf("EOF: disconnect\n");
	close(sockfd);
	return 0;
}