【正文】 研究內(nèi)容是利用套接字開發(fā)網(wǎng)絡(luò)嗅探器的程序設(shè)計(jì)，設(shè)計(jì)要求完成對(duì)流經(jīng)本地網(wǎng)卡的所有數(shù)據(jù)包的捕獲，分析協(xié)議類型，并根據(jù)不同的協(xié)議類型對(duì)數(shù)據(jù)包進(jìn)行了進(jìn)一步的分析，包括分析數(shù)據(jù)包的源 IP 地址、目的IP 地址、源端口號(hào)、目的端口號(hào)、大小等。設(shè)計(jì)完成后經(jīng)測試能實(shí)現(xiàn)預(yù)期要求的功能。但是仍然存在一些不足之處，例如：，只對(duì)數(shù)據(jù)包作了簡單分析，分析內(nèi)容不是很全面；，而對(duì)于諸如交換機(jī)這類設(shè)備，由于它能夠阻止廣播，所以就不能夠?qū)ψ泳W(wǎng)內(nèi)其他的機(jī)器進(jìn)行監(jiān)聽，若想要對(duì)此子網(wǎng)進(jìn)行監(jiān)聽，就必須處于與此交換機(jī)同級(jí)的包交換網(wǎng)絡(luò)中。通過對(duì)該課題的研究，讓我對(duì)嗅探技術(shù)有了進(jìn)一步的了解，對(duì)其兩面性在網(wǎng)絡(luò)中產(chǎn)生的影響有了更深的認(rèn)識(shí)，為了打破以上局限性，還需要結(jié)合已學(xué)知識(shí)對(duì)網(wǎng)絡(luò)嗅探技術(shù)方面的知識(shí)作進(jìn)一步的學(xué)習(xí)。參考文獻(xiàn)[1] 求是科技， C++ 程序設(shè)計(jì)從入門到精通[M].北京：人民郵電出版社,2022。[2] 鄭莉，++語言程序設(shè)計(jì)（第二版）[M].北京：清華大學(xué)出版社，2022。[3] 張仕斌，譚三，易勇，[M].北京：清華大學(xué)出版社，2022。[4] 劉志祥. Linux 系統(tǒng)安全性研究及其新型 Sniffer 設(shè)計(jì)與實(shí)現(xiàn)[D]. 南昌：南昌大學(xué)[碩士論文], 2022。[5] [D].北京：中國地質(zhì)大學(xué)[碩士論文]，2022。[6] Agent 分布式入侵檢測系統(tǒng)中通信機(jī)制和數(shù)據(jù)分析方法研究[D].江蘇：南開大學(xué)[碩士論文]，2022。[7] 神經(jīng)網(wǎng)絡(luò)在網(wǎng)絡(luò)入侵檢測系統(tǒng)中的應(yīng)用[D].南京：南京理工大學(xué)[碩士論文]，2022。[8] [D].黑龍江：哈爾濱工業(yè)大學(xué)[碩士論文]，2022。致 謝本文是在趙攀老師和盛志偉老師的熱情關(guān)心和指導(dǎo)下完成的，他們淵博的知識(shí)和嚴(yán)謹(jǐn)?shù)闹螌W(xué)態(tài)度使我受益匪淺，對(duì)順利完成本課題起到了極大的作用。在此向他表示我最衷心的感謝！在論文完成過程中，本人還得到了張仕斌老師和陳偉同學(xué)的熱心幫助，本人向他們表示深深的謝意！最后向在百忙之中評(píng)審本文的各位專家、老師表示衷心的感謝！作者簡介： 姓 名：鄭 莉 性別：女 出生年月：1985 年 1 月 民族：漢Email：聲 明本論文的工作是 2022 年 2 月至 2022 年 6 月在成都信息工程學(xué)院 系完成的。文中除了特別加以標(biāo)注地方外，不包含他人已經(jīng)發(fā)表或撰寫過的研究成果，也不包含為獲得成都信息工程學(xué)院或其他教學(xué)機(jī)構(gòu)的學(xué)位或證書而使用過的材料。除非另有說明，本文的工作是原始性工作。關(guān)于學(xué)位論文使用權(quán)和研究成果知識(shí)產(chǎn)權(quán)的說明本人完全了解成都信息工程學(xué)院有關(guān)保管使用學(xué)位論文的規(guī)定，其中包括：（1）學(xué)校有權(quán)保管并向有關(guān)部門遞交學(xué)位論文的原件與復(fù)印件。（2）學(xué)?？梢圆捎糜坝?、縮印或其他復(fù)制方式保存學(xué)位論文。（3）學(xué)校可以學(xué)術(shù)交流為目的復(fù)制、贈(zèng)送和交換學(xué)位論文。（4）學(xué)校可允許學(xué)位論文被查閱或借閱。（5）學(xué)校可以公布學(xué)位論文的全部或部分內(nèi)容（保密學(xué)位論文在解密后遵守此規(guī)定） 。除非另有科研合同和其他法律文書的制約，本論文的科研成果屬于成都信息工程學(xué)院。特此聲明！ 作者簽名： 年 月 日12Visafree policy brings Chengdu biz, tourism boost. Making national headlines several times, Chengdu39。s 72hour visafree policy has attracted wide attention from both Chinese and foreign experts and businessmen since it took effect on Sept 1 last year. The program permits citizens from 51 countries and regions including the United States, Australia, Canada and Japan who have valid visas and flight tickets to a third country to spend three days in the city. The capital of Sichuan province is the first city in the western region of China to offer foreign tourists a threeday visa and the fourth nationwide to adopt the policy following Shanghai, Beijing and Guangzhou. Li Zhiyong, deputy dean of the tourism institute at Sichuan University, said the move contributes to a large increase in the number of overseas tourists and raises the city39。s level of internationalization. The policy will also bring direct economic revenue, Li said. Chengdu has many cultural legacies and is also a paradise for panda lovers with the world39。s largest breeding and research center. Three days are long enough for foreign visitors to visit those iconic tourist spots, he noted. The city is home to the remains of the Jin sha civilization that dates back more than 3,000 years as well as the Qing cheng Mountains and the Du jiang yan irrigation system. Qing cheng has long been recognized as the birthplace of Taoism, China39。s ancient indigenous religion, while Du jiang yan is considered to be the oldest functioning watercontrol project in the world. Chengdu ranked third in tourist facilities, management and services among 60 Chinese cities in a customer satisfaction survey released last year. But, Li added that efforts are still needed to develop more tourism products, improve English services and provide accurate translation of traffic signs and scenic billboards. Zhao Yun, chairwoman of British Chamber of Commerce Southwest China, told China Daily that his colleagues found the policy very convenient. A British client once flew here and stayed for just one day to check her ordered goods, she said. Zhao was born in Shanxi province, but she has lived in Chengdu for more than 10 years. My life was like a running race moving from place to place. I also lived in Beijing and Shanghai before, she said. But Chengdu is a place that you never want to leave once settling down. It is now my second hometown, she said. If the environment is further improved, the city will attract more people to visit and live, with the 72hour visafree policy and pelling conditions in transportation, culture, climate and cuisine, he said. Foreigners also gave positive feedback on the policy. A spokesman from Dell Inc said the pany has a global hub of operation in Chengdu, so the threeday visa has an immediate and positive influence on the pany39。s business development. Rudy Buttignol, president of the public broadcasting pany in British Columbia, Canada, said his work requires frequent travel to Chengdu and the policy makes the trips easier. Data from the city39。s public security bureau shows some 100 foreign visitors enjoyed the 72hour policy by the end of March, most of them from the United States, the United Kingdom and Germany. Chengdu also reported robust growth in its overall tourist industry last year. Official statistics show that it received some 150 million tourists last year, an increase of 28 percent from 2022. Around million came from abroad, an increase of 12 percent. Total revenue from tourism surpassed 133 billion yuan ($). During his visit to Kazakhstan in September, Chinese President Xi Jinping proposed that China and Central Asia join hands to build a Silk Road economic belt to boost cooperation. The idea has been widely echoed in Central Asian countries, being an encouraging blueprint for Chinese areas along the Silk Road that has linked Asia and Europe for more than 2,000 years. In the next three weeks, China Daily reporters will travel through the belt in China and in Kazakhstan, Uzbekistan and Turkey. They will show the progress and expectations of the countries, businesses and peoples on the route. Shaanxi the start of the ancient Silk Road has positioned itself as the new starting point for the development of the Silk Road Economic Belt, which will strengthen China39。s cooperation with Central