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Socket Program Training

Socket Program Training. 10/24/2011. Introduction. Video Streaming Server Darwin VoIP Asterisk Socket Program Ex: FTP Backdoor Program. Darwin Streaming Server. The open source version of Apple’s QuickTime Streaming Server technology Updated Version v6.0.3 http://dss.macosforge.org/

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Socket Program Training

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  1. Socket Program Training 10/24/2011

  2. Introduction • Video Streaming Server • Darwin • VoIP • Asterisk • Socket Program • Ex: FTP • Backdoor Program

  3. Darwin Streaming Server • The open source version of Apple’s QuickTime Streaming Server technology • Updated Version v6.0.3 • http://dss.macosforge.org/ • Previous Version • v5.5.5

  4. Installation • tar zxf DarwinStreamingSrvr5.5.5-Linux.tar.gz • cd DarwinStreamingSrvrlinux-Linux • ./Install • Please enter a new administrator user name: user_name • Please enter a new administrator Password: your_password

  5. Starting • sudo /usr/local/sbin/DarwinStreamingServer • sudo /usr/local/sbin/streamingadminserver.pl • http://darwin.streaming.server:1220/

  6. Asterisk • Asterisk is software that turns an ordinary computer into a communications server. • The Latest Version 10.0.0-beta1 • http://www.asterisk.org/downloads • V1.8.7.1

  7. Installation (1/7) • Run "./configure"

  8. Installation (2/7) • Run "make menuselect" [optional]

  9. Installation (3/7) • Run "make"

  10. Installation (4/7) • Run "make install"

  11. Installation (5/7) • Finally, you can launch Asterisk with: • # asterisk –vvvc

  12. Installation (6/7) • You can type "core show help" at any time to get help with the system.

  13. Installation (7/7)

  14. What is a Socket ? • An interface between an application process and transport layer (TCP or UDP).

  15. TCP Server Socket ( ) Bind ( ) TCP Client Listen ( ) Socket ( ) Accept ( ) Build a connection Connect ( ) Waiting for the requests from client send ( ) recv ( ) Data (request) Deal with the request send ( ) Data (reply) recv ( ) Notify the end of the file Read ( ) Close ( ) Close ( )

  16. EX: FTP Server (1/2)

  17. EX: FTP Server (2/2)

  18. EX: FTP Client (1/2)

  19. EX: FTP Client (2/2)

  20. Compile • gcc -o filename filename.c • # gcc -o server server.c • # gcc -o client client.c • Execute the filename • # ./filename • # ./filename server_IP number_of_file file1 file2 file3

  21. Backdoor program /usr/src/kernels/fedora/include/linux/skbuff.h

  22. Defined as a function in: net/ipv4/ip_input.c, line 379 Defined as a function prototype in: include/net/ip.h, line 93 Referenced (in 3 files total) in: include/net/ip.h, line 93 net/ipv4/af_inet.c, line 1560 net/ipv4/ip_input.c, line 379

  23. IP Layer int count(struct sk_buff* skb){ struct iphdr *iph; struct udphdr *udph; struct timeval tv; static int total_packet = 0; static int last_timestamp = 0;

  24. IP Layer iph = skb->nh.iph; printk("=================IP=================\n"); //IP Header printk("Version = %d\n",iph-> version); printk("IHL = %d\n",iph-> ihl*4); printk("Type of Service = %d\n",iph-> tos); printk("Total Length = %d\n",ntohs(iph-> tot_len)); printk("Identification = %d\n",iph-> id); printk("Fragmentation Offset = %d\n",iph-> frag_off); printk("Time to live = %d\n",iph-> ttl); printk("Protocol = %d\n",iph-> protocol);

  25. IP Layer printk("Header Checksum = 0x%x\n",iph-> check); printk("Source Address = %d.%d.%d.%d\n",*(skb->nh.raw+12),*(skb->nh.raw+13),*(skb->nh.raw+14),*(skb->nh.raw+15)); printk("Distination Address = %d.%d.%d.%d\n",*(skb->nh.raw+16),*(skb->nh.raw+17),*(skb->nh.raw+18),*(skb->nh.raw+19));

  26. TCP Layer if(iph-> protocol == IPPROTO_UDP) {//UDP Header printk("================UDP=================\n"); udph = (struct udphdr *)(skb->nh.raw + iph->ihl*4); printk("Source Port = %d\n",ntohs(udph->source)); printk("Distination Address = %d\n",ntohs(udph-> dest)); printk("Segment Length = %d\n",ntohs(udph-> len)); printk("Checksum = 0x%x\n",udph-> check);

  27. Q&A

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