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FTP协议分析及其客户程序的实现 总被引:2,自引:1,他引:2
本文分析了FTP(FileTransferProtocol)文件传输协议的内部实现,同时提出了FTP客户程序在工作站上的套接字实现方法 相似文献
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Rao H.C. Peterson L.L. 《IEEE transactions on pattern analysis and machine intelligence》1993,19(6):613-624
The Jade file system, which provides a uniform way to name and access files in an Internet environment, is introduced. Jade is a logical system that integrates a heterogeneous collection of existing file systems in which underlying file systems support different file access protocols. Because of autonomy, Jade is designed under the restriction that the underlying file systems may not be modified. In order to avoid the complexity of maintaining an Internet-wide, global name space, Jade permits each user to define a private name space. Jade's name space supports two features: it allows multiple file systems to be mounted under one directory, and it permits one logical name space to mount other logical name spaces. A prototype of Jade has been implemented to examine and validate its design. The prototype consists of interfaces to the Unix File System, the Sun Network File System, and the File Transfer Protocol. An overview of Jade's design is reported, and the authors' experiences in designing and implementing a large scale file system are reviewed 相似文献
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目前在网络环境下进行多媒体教学,网络速度是一个严重的瓶颈问题。在分析瓶颈产生的基础上,作者提出了一个新的文件传输协议──NFTP(Narrowband File Transfer Protocol窄带文件传输协议),利用广播数据包方法解决多媒体教学中的速度问题,并设计了一组协议原语,用于协议的描述。 相似文献
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提出了一种快速、自动部署OpenStack云平台的解决方案,以提高OpenStack的部署效率.该方案首先创建不同节点类型的镜像模板文件; 接着根据节点类型(如网络节点、计算节点)将已制作好的镜像模板进行复制,并依照节点的属性(如IP地址、hostname标识等)使用脚本自动修改配置文件,完成单个节点的部署; 之后,利用相同的策略实现其他节点的快速部署.在部署的基础上,通过管理服务器提供的预启动执行环境(PXE)、动态主机配置协议(DHCP)及简单文件传输协议(TFTP)等网络服务挂载节点的镜像块文件,最终完成节点的启动.此外,建立了性能评价模型用于确定源镜像副本和存储服务器的最佳数量,以优化存储网络的拓扑结构.实验结果表明,无论是使用相同存储网络部署不同大小的云平台,还是使用不同大小的存储网络部署相同大小的云平台,与Cobbler、网络文件系统(NFS)等部署方案相比,所提解决方案大大减少了部署时间,提高了部署效率. 相似文献
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FTP(FileTransferProtocol)在互连网上使用的非常广泛的一种协议,然而该协议在最初的设计过程当中没有充分考虑到安全性问题,因而存在着安全隐患,vsftpd(verysecureFTPdaemon)它的开发者非常注重它的安全性。详细描述了在Solaris9操作系统下,设置和建立vsftpd服务器,从而为构筑安全可靠的大型FTP服务器提供一种新的解决方案。 相似文献
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《Computer Networks and ISDN Systems #》1997,29(8-13):1083-1090
This paper presents a framework for bringing the MBone and the World-Wide Web closer together by introducing real-time distribution of HTML-pages and synchronization of WWW-browsers. This framework will enable distributed presentations of WWW-material using the mWeb application. Distribution is done using two new protocols, Scalable Reliable Real-time Transport Protocol — SRRTP and Scalable Reliable File Distribution Protocol — SRFDP. Synchronization is achieved using the WebDesk Control Bus, which allows for scalable messaging in large groups of programs and hosts. This paper also presents how the mWeb application can be used for programmed presentations resulting in a television-like Web-TV. The mWeb framework also includes support for creating HTML-slides and the usage of semantic remote-pointers. 相似文献
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Fengming M. Chang 《Applied Intelligence》2007,27(1):39-47
It is hard to block e-mail bombs because they are usually sent by normal SMTP (Simple Mail Transfer Protocol) applications
with fake mail sender addresses and IP addresses. Fortunately, original network packets contain real IP address information
anyway. Collecting and analyzing these packet contents can help an administrator to realize where the e-mail bombs are coming
from and block them. This article presents a simple method that uses a bandwidth manager device to collect and analyze packets
to get e-mail bombs information as well as to block e-mail bomb source IP addresses in routers. In practical application experiences
at the computer center in a university, this method blocked e-mail bombs simply and effectively. Furthermore, a fuzzy inference
system was also designed to help identify e-mail bombs. Its fuzzy membership functions could be adapted using the fuzzy neural
network learning method. In brief, the proposed method affords an automatic and adaptable alarm to find e-mail bombs. 相似文献
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基于C#的FTP客户端的实现 总被引:1,自引:0,他引:1
探讨文件传输协议(FTP)的内容和工作原理,设计C/S架构下的FTP客户端的实现方案,在.NET平台利用C#语言搭建起FTP客户端的窗体界面,并且使用.NET类库实现了文件上传、删除和修改等功能。 相似文献
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《Information Security Journal: A Global Perspective》2013,22(2):22-41
Abstract Spam can be defined as unsolicited e- mail, often of a commercial nature, sent indiscriminately to multiple mailing lists, individuals, or newsgroups. Spoofing (Templeton and Levitt, 2003) is a technique often used by spammers to make them harder to trace. Trojan viruses embedded in e-mail messages also employ spoofing techniques to ensure the source of the message is more difficult to locate (Ishibashi et al., 2003). Spam filters and virus scanners can eliminate only a certain amount of spam and also risk catching legitimate e-mails. As the SoBig virus has demonstrated, virus scanners themselves actually add to the e-mail traffic, through notification and bounceback messages. Simple Mail Transfer Protocol (SMTP) is flawed in that it allows these e-mail headers to be faked and does not allow for the sender to be authenticated as the real sender of the message. If this problem can be solved, it will result in a reduction in spam e-mail messages and more security for existing e-mails, and it will allow e-mail viruses to be tracked down and stopped more effectively (Schwartz and Garfinkel, 1998). This approach is known as “trusted e-mail.” 相似文献
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简单对象访问协议(SOAP)是一种轻量的、简单的、基于XML的协议,它被设计成在WEB上交换结构化的和固化的信息。SOAP可与现存的许多因特网协议和格式结合使用,包括超文本传输协议(HTTP),简单邮件传输协议(SMTP),多用途网际邮件扩充协议(MIME)。它还支持从消息系统到远程过程调用等大量的应用程序。目前对SOAP的应用研究主要集中在远程过程调用协议(Remote Procedure Call Protocol)方面。SOAP在无线传感器网络中的使用尚无先例,文章从无线传感器网络中信息的加密和解密、信息验证两方面介绍简单对象访问协议在无线传感器网络中的应用。 相似文献
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《Computer Standards & Interfaces》2001,23(4):279-310
A flexible protocol simulator is presented that supports interactive visual experimentation with protocols. The simulator is modular and allows ready addition of new protocols. Use of Java permits protocol simulations to be delivered via the web, and also to be developed in an object-oriented manner. A range of simulations is presented, covering link-level protocols to application-oriented protocols. The Trivial File Transfer Protocol is used to illustrate in detail how a protocol simulation is implemented. 相似文献
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针对当前网页防篡改系统普遍忽略备份恢复的缺陷,提出了一种网页防篡改系统模型,在此模型基础上设计了一个高效安全的网页防篡改异地备份恢复系统。此系统采用多版本控制技术管理备份网页数据,可以根据用户需求恢复不同时期不同版本备份数据。备份数据采用高效的LZMA压缩存储,有效提高了磁盘利用率,采用DES算法加密和文件传输协议(FTP)实现安全的远程存储及传输。最后,系统性能测试说明此系统在不影响Web服务器负载前提下能对Web服务器数据进行有效的备份和恢复,能保证单个被篡改的网页在100ms内恢复,是解决网页篡改问题的一个有效手段。 相似文献
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基于物理隔离系统的安全文件传输 总被引:2,自引:0,他引:2
随着电子政务的发展和建设,其中的网络安全问题越来越得到人们的重视。文件传输作为网络中最重要的应用之一,它的安全性问题更为突出。该文介绍了一种基于物理隔离的网络安全信息交换技术,在采用该技术的安全隔离交换系统SGAP中,设计并实现了一个安全的文件传输系统。该系统基于先进的物理隔离技术,大大提高了文件传输的安全性。基于SGAP系统的文件传输系统将在电子政务的建设和发展中发挥重要作用。 相似文献
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一种基于透明计算的远程启动协议MRBP2 总被引:4,自引:0,他引:4
计算机网络和终端技术的进步推动了计算机应用的迅速发展,用户可以通过网络获得各种不同的分布式应用.但是,这些应用系统都依赖于固定操作系统.如Windows、Linux等.本文提出了一种支持终端通过以太网从服务器动态获得不同操作系统、并在客户端动态执行的远程启动协议MRBP2(Multi-OS Remotc Booting Protocol Two).MRBP2协议把服务器上的不同操作系统通过OSPM机制(Operating System Preboot Mechanism)和SFTP协议(Sector based File Transfer Protocol)下载到客户端.完成操作系统的启动和运行.本文还给出MRBP2协议的实现及在实际系统上的应用. 相似文献
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基于Bluetooth OBEX协议的文件传输技术的研究 总被引:7,自引:0,他引:7
蓝牙技术是近年来迅速发展的一项短距离无线通信技术,OBEX作为蓝牙协议栈中面向应用的会话层协议,提供了灵活的目标文件交换方式,本文研究了OBEX协议的原理及结构,仔细分析了OBEX层模块间的接口和数据流,并着重讨论了基于OBEX的文件传输应用的实现技术,最后介绍了作者开发的蓝牙设备间通过无线信道传输文件的一个实例。 相似文献