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#Simple syn software
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#Simple syn code
* * Redistributions of source code must retain the above copyright * modification, are permitted provided that the following conditions are * Redistribution and use in source and binary forms, with or without This case, we use the first one, but generally the second one is simpler Send a dummy packet so that the function checks the flag and ends. The return value of the sniffer functor, modify it when you're done and The same mechanism to stop sniffing: define a "special packet" that That is why applications that use the Sniffer class usually use You are probably sniffing on one thread, and sending packets or In most of the cases, this is completely useless, since Using the pcap_breakloop only from the thread that is actually Is what the Sniffer class uses to achieve sniffing, can be stopped One thing to notice is how sniffing is stopped. This doesn't take into account filtered ports, so you won't seeĪny output for any ports that are filtered by some firewall. If the host's answer has the RST flag on, then the port isĬlosed, if it contains the SYN and ACK flag on, then it's This is done by sending TCP frames with the SYN flag If that host has those ports open or not. It takes an IP address andĪ variable number of ports as command line arguments, and verifies