【導讀】端口掃描技術(shù)是網(wǎng)絡(luò)安全掃描技術(shù)的重要技術(shù)之一。端口掃描，是網(wǎng)絡(luò)系統(tǒng)入侵者進入目標系統(tǒng)的第一步。理和應(yīng)用進行了闡述，并設(shè)計了一個簡單的基于windows平臺上的端口掃描系統(tǒng)。實際設(shè)計中采用了掃描安全性和可行性較好的SYN探測技術(shù)來實現(xiàn)端口。掃描，并實現(xiàn)了端口列表自定義，掃描結(jié)果存儲等幾大模塊化功能。前的實際情況對端口掃描的未來發(fā)展方向提出了一點個人的看法。

　　

【正文】 本文是在張金全老師的熱情關(guān)心和指導下完成的，他淵博的知識和嚴謹?shù)闹螌W作風使我受益匪淺，對順利完成本文起到了極大的作用。在此向他表示我最衷心的感謝！ 在論文完成過程中，本人還得到了毛磊和伍映譙等同學的熱心幫助，本人向他們表示深深的謝意！ 最后向在百忙之中評審本文的各位專家、老師表示衷心的感謝！ 作者簡介： 姓 名：牟楠軻 性別：男 出生年月： 1985 年 1 月 民族：漢 Email: 第 22 頁 共 22 頁 聲 明 本論文的工作是 2021年 2月至 2021年 6月在成都信息工程學院網(wǎng)絡(luò)工程系完成的。文中除了特別加以標注的地方外，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院或其他教學機構(gòu)的學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)于學位論文使用權(quán)和研究成果知識產(chǎn)權(quán)的說明： 本人完全了解成都信息工程學 院有關(guān)保管使用學位論文的規(guī)定，其中包括： （ 1）學校有權(quán)保管并向有關(guān)部門遞交學位論文的原件與復印件。 （ 2）學?？梢圆捎糜坝?、縮印或其他復制方式保存學位論文。 （ 3）學?？梢詫W術(shù)交流為目的復制、贈送和交換學位論文。 （ 4）學校可允許學位論文被查閱或借閱。 （ 5）學校可以公布學位論文的全部或部分內(nèi)容（保密學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院。 特此聲明！ 作者簽名： 2021 年 6 月 日 第 23 頁 共 22 頁 Anyway, I was here in Amber some years ago. Not doing much of anything. Just visiting and being a nuisance. Dad was still around, and when I noticed that he was gett ing into one of his grumpy moods, I decided it was time to take a walk. A long one. I had often noticed that his fondness for me tended to increase as an inver se function of my proximity. He gave me a fancy riding crop for a goingaway presentto hasten the process of affection, I suppose. Still, it was a very nice cropsilverchased, beautifully tooledand I made good use of it. I had decided to go looking for an assemblage of all my simple pleasures in one small nook of Shadow. It was a long rideI will not bore you with the detailsand it was pretty far from Amber, as such things go. This time, I was not looking for a place where I would be especially important. That can get either boring or difficult fairly quickly, depending on how responsible you want to be. I wanted to be an irresponsible nonentity and just enjoy myself. Texorami was a wide open port city, with sultry days and long nights, lots of good music, gambling around the cloc k, duels every morning and inbetween mayhem for those who couldn39。t wait. And the air currents were fabulous. I had a little red sail plane I used to go sky surfing in, every couple of days. It was the good life. I played drums till all hours in a basement spot up the river where the walls sweated almost as much as the customers and the smoke used to wash around the lights like streams of milk. When I was done playing I39。d go find some action, women, or cards, usually. A nd that was it for the rest of the night. Damn Eric, anywayl That reminds me again . . . He once acc used me of cheating at cards, did you know that? And that39。s about the only thing I wouldn39。t cheat at. I ta ke my card playing seriously. I39。m good and I39。m also luc ky. Eric was neither. The trouble with him was that he was good at so many things he woul dn39。t admit even to himself that there were some things other people could do better. If you kept beating him at anything you had to be cheating. He started a nasty argument over it one nightcould have gotten seriousbut Gerard and Caine broke it up. G ive Caine that. He took my part that time. Poor guy . . . Hell of a way to go, you know? His throat . . . Well, anyhow, there I was in Texorami, making music and women, winning at cards and jockeying around the sky. Palm trees and nightblooming wallflowers. Lots of good port smellsspices, coffee, tar, saltyou know. Gentlefolk, merchants, and peons the same straights as in most other places. Sailors and assorted travelers passing in and out. Guys like me living around the edges of things. I spent a little over two years in Texorami, happy. Really. Not much contact with the others. Sort of postcard like hellos via the Trumps every now and then, and that was about it. Amber was pretty much off my mind. All this changed one night when I was sitting there with a fu ll ho use and the guy across from me was trying to make up his mind whether or not I was bluffing. The Jack of Diamonds began talking to me. Yes, that is how it started. I was in a weird frame of mind anyway. I had just finished a couple very hot sets and was still kind of high. A lso, I was physically strung out from a long day39。s gliding and not much sleep the night before. I decided later that it must be our mental quir k associated w ith the Trumps that made me see it that way when someone was trying to reach me and I had cards in my handany cards. Ordinarily, of course, we get the message empty handed, unless we are doing the calling. It could have been that my subconsciouswhich was kind of footloose at the timejust seized on the available props out of habit Later, though, I had cause to wonder. Really, I just don39。t know. The Jac k said, Random. Then its face blurred and it said, Help me. I began getting a feel of the personality by then, but it was weak. The whole thing was very weak. T hen the face rearranged itself and I saw that I was right. It was Brand. He looked like hell, and he seemed to be chained or tied to something. Help me, he said again. I39。m here, I said. What39。s the matter? . . . prisoner, he said, and something else that I couldn39。t make out. Where? I asked. He shook his head at that. Can39。t bring you through, he said. No Trumps, and I am too weak. You will have to e the long way around.... I did not ask him how he was managing it without my Trump. Finding out where he was seemed of first importance. I asked him how I could locate him. Look very closely, he said. Remember every feature. I may only be able to show you once. Come armed, too. . . . Then I saw the landscapeover his shoulder, out a window, over a battlement, I can39。t be sure. It was far from Amber, somewhere where the shadows go ma d. Farther than I like to go. Star k, w ith shifting colors. Fiery. Day without a sun in