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64 lines
3 KiB
Text
64 lines
3 KiB
Text
client.c
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This client.c program is designed to fake being a web browser. It sends the
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expected requests to the web server over a network socket connection and
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displays the results as text rather than graphically displaying the results. In
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the code you will have to change the two lines as below to match your web
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server or nweb server.
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/* YOU WILL HAVE TO CHANGE THESE TWO LINES TO MATCH YOUR CONFIG / #define PORT
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* 8181 /
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Port number as an integer - web server default is 80 / #define IP_ADDRESS
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"192.168.0.8" / IP Address as a string */
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The default is to request the /index.html from the web server. If you want to
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request another file then change the GET line as below:
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char *command = "GET /index.html HTTP/1.0 \r\n\r\n" ;
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To, for example:
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char *command = "GET /nigel.jpg HTTP/1.0 \r\n\r\n" ;
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Then compile the program with: cc client.c -o client
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I save the output in to a file as putting a non-test file like .jpg to the
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terminal screen can cause chaos: client >output
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Then edit the output file: vi output
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In real life, the interaction of web browser and web server can be much more complex.
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1. The web browser can tell the web server about its name, version and capabilities.
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2. The web server can send complex file types line JavaScript or Java programs
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or other active components.
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3. They can maintain a longer connection over the socket for efficiency.
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4. Below is an example of my Firefox brower requesting an index.html file. I
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have added newline characters to make it readable - it is 1300 bytes long! I
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have no idea what most of it is about. You will have to read the The World Wide
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Web Consortium (W3C) at http://www.w3.org for all the details.
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GET /index.html HTTP/1.1Host: myserver.home.com:80User-Agent: Mozilla/5.0 (W indows;
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U; Windows NT 5.1; en-GB; rv:1.9.2.28) Gecko/20120306 Firefox/3.6.28 (.NET CLR
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3.5.30729)Ac cept: image/png,image/;q=0.8,/*;q=0.5Accept-Language:
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en-gb,en;q=0.5Accept-Encoding: gzip,defla teAccept-Charset: ISO-8859-1,utf-8;
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q=0.7,*;q=0.7Keep-Alive: 115Connection: keep-alive**Referer:
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http://myserver.uk.home.com:8181/index.html**Cookie:
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__utma=101107545.1790272076.1316019590.13289002 55.1328908680.164;
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__utmz=101107545.1328566199.157.46.utmcsr=t.co|utmccn=(referral)|utmcmd=referral| u
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tmcct=/iTJx4DO1; UnicaNIODID=ZBr8gm79vIG-XKeoGGb; W3SSO_ACCESS=abc.home.com;
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ISP=70fdfc95
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d93011d783e4de784ea97766-70fdfc95d93011d783e4de784ea97766-f67749a8b899e8ceed7e940b8c4bf189;
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Prof ile=2000121913394303111032836125|EN|866|866.BDF|en-GB;
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_unam=693fb60-1337f162b72-11770d11-5; WLS intra_USERID=nigel@hotmail.com;
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ipcInfo=cc%3Duk%3Blc%3Den%3Bac%3Dall; iwm1p=214617669; bprememberme=nigel@
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hotmail.com; EPSPROFILE=EE2355DFE16AE020BE6C62FCB6BF5602;
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DWPERM=Xa.2/Xb.Xzso3-U35t8RWKvqBreGaQMgsP_RG
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Fl1124oIt-L-OPJIdSautkBN0D4NUp9JLlpUqPqB6CWOo-pgrJwhxNvvSfPAajgetaA2MOYwHfQPXPTRG9zwOMMR57EHQtXhOy5Om
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yzanyZthvVClm6uxvbwh0isEQ2Mm_9g2l7NjcA3RJdjuLaB3qlljOmyVuhDjBkgdNEb3PgYcCpbiu1FUzXrhPalhgsbAj7NBkaY88
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Yyg/Xc./Xd./Xf./Xg.1696801
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I hope this has been instructive, thanks, Nigel Griffiths
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