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POhow to send get request to torrent tracker server
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  1. POhow to send get request to torrent tracker server
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    copied!<p>I am tying to implement a bit torrent client. I am getting my information from here: <a href="http://wiki.theory.org/BitTorrent_Tracker_Protocol" rel="nofollow">http://wiki.theory.org/BitTorrent_Tracker_Protocol</a>.</p> <p>I want to send a get request to tracker to get the peer list. Should I set up a udp connection and connect to udp://tracker.thepiratebay.org at port 80? Is this what my request message should look like?</p> <pre><code>"udp://tracker.thepiratebay.org??info_hash=12345678901234567890 &amp;peer_id=ABCDEFGHIJKLMNOPQRST port=6888 &amp;downloaded=0 &amp;left=0 &amp;event=started " </code></pre> <p>this is my part of my code:</p> <pre><code> char *requestToSend; int sock; struct sockaddr_in servAddr; struct sockaddr_in fromAddr; int fromSize; int respStringLen; int portNum =80; char data_recv[ECHOMAX]; char *hash="12345678901234567890"; char *id="ABCDEFGHIJKLMNOPQRST"; char *temp ="udp://tracker.thepiratebay.org??info_hash=12345678901234567890\n&amp;peer_id=ABCDEFGHIJKLMNOPQRST\nport=6888\n&amp;downloaded=0\n&amp;left=0\n&amp;event=started"; requestToSend = malloc(sizeof(temp)+1); sprintf(requestToSend, "%s??info_hash=%s\n&amp;peer_id=%s\nport=%s\n&amp;downloaded=0\n&amp;left=0\n&amp;event=started\0","udp://tracker.thepiratebay.org", hash,id,"6888"); printf("%s to send \n", requestToSend); /* Create a datagram/UDP socket */ if ((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) &lt; 0){ printf("fail create socket"); return 0; } /* Construct the server address structure */ struct hostent *hp = gethostbyname("udp://tracker.thepiratebay.org"); memset(&amp;servAddr, 0, sizeof(servAddr)); /* Zero out structure */ servAddr.sin_family = AF_INET; /* Internet addr family */ memcpy( (char *) &amp;servAddr.sin_addr.s_addr, hp-&gt;h_addr, hp-&gt;h_length ); servAddr.sin_port = htons(portNum); /* Server port */ //send request to tracker server if (send(sock, requestToSend, strlen(requestToSend), 0) != strlen(requestToSend)){ printf("fail send"); return 0; } /* Recv a response */ fromSize = sizeof(fromAddr); if ((respStringLen = recvfrom(sock, data_recv, ECHOMAX, 0, (struct sockaddr *) &amp;fromAddr, &amp;fromSize)) != strlen(requestToSend)){ printf("fail to recv"); return 0; } </code></pre> <p>this is what I am getting from a torrent file </p> <pre><code> dict { announce =&gt; str = http://tracker.thepiratebay.org/announce (len = 40) announce-list =&gt; list [ list [ str = http://tracker.thepiratebay.org/announce (len = 40) ] list [ str = udp://tracker.thepiratebay.org:80/announce (len = 42) ] list [ str = http://tracker.openbittorrent.com/announce (len = 42) ] list [ str = udp://tracker.openbittorrent.com:80/announce (len = 44) ] ] creation date =&gt; int = 1174816388 encoding =&gt; str = UTF-8 (len = 5) info =&gt; dict { filehash =&gt; str = ¸¥£öüËXþÐS®(äfn6 (len = 20) length =&gt; int = 2222949 name =&gt; str = Audacity.zip (len = 12) name.utf-8 =&gt; str = Audacity.zip (len = 12) piece length =&gt; int = 32768 pieces =&gt; str = (null) (len = 0) } } d8:announce40:http://tracker.thepiratebay.org/announce13:announce-listll40:http: //tracker.thepiratebay.org/announceel42:udp://tracker.thepiratebay.org:80/announ ceel42:http://tracker.openbittorrent.com/announceel44:udp://tracker.openbittorre nt.com:80/announceee13:creation datei1174816388e8:encoding5:UTF-84:infod8:fileha sh20: ¸¥£öüËXþÐS®(äfn66:lengthi2222949e4:name12:Audacity.zip10:name.utf-812:Audacity.z yf3-ûBÎNrl lengthi32768e6:pieces1360:þ]úÙÉÅ'NÕæ+gd3fi6è6¶ </code></pre>
 

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