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Member "tcpflow-1.6.1/src/scan_tcpdemux.cpp" (19 Feb 2021, 2045 Bytes) of package /linux/misc/tcpflow-1.6.1.tar.gz:

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    1 /**
    2  * tcp demultiplixier scanner.
    3  *
    4  * We have a single global tcpdemultiplixer because it needs to manage
    5  * a global resource --- the maximum number of open files.  We get the
    6  * singleton instance and put it in the user argument of the global
    7  * callback array. We could have designed the callback system to take
    8  * an instance which is subclassed from an abstract superclass, but
    9  * that would require a virtual function resolution on every function
   10  * call, whereas here we simply have a function call with two
   11  * arguments (which is faster, but less safe.)
   12  */
   13 
   14 #include "config.h"
   15 #include "tcpflow.h"
   16 #include "tcpip.h"
   17 #include "tcpdemux.h"
   18 #include <iostream>
   19 #include <sys/types.h>
   20 #include "bulk_extractor_i.h"
   21 
   22 
   23 /** callback called by process_packet()
   24  */ 
   25 static void packet_handler(void *user,const be13::packet_info &pi)
   26 {
   27     reinterpret_cast<tcpdemux *>(user)->process_pkt(pi);
   28 }
   29 
   30 extern "C"
   31 void  scan_tcpdemux(const class scanner_params &sp,const recursion_control_block &rcb)
   32 {
   33 
   34     if(sp.sp_version!=scanner_params::CURRENT_SP_VERSION){
   35     std::cerr << "scan_tcpdemux requires sp version " << scanner_params::CURRENT_SP_VERSION << "; "
   36           << "got version " << sp.sp_version << "\n";
   37     exit(1);
   38     }
   39 
   40     if(sp.phase==scanner_params::PHASE_STARTUP){
   41     sp.info->name  = "tcpdemux";
   42     sp.info->author= "Simson Garfinkel";
   43     sp.info->packet_user = tcpdemux::getInstance();
   44     sp.info->packet_cb = packet_handler;
   45         
   46         sp.info->get_config("tcp_timeout",&tcpdemux::getInstance()->tcp_timeout,"Timeout for TCP connections");
   47         sp.info->get_config("tcp_cmd",&tcpdemux::getInstance()->tcp_cmd,"Command to execute on each TCP flow");
   48         sp.info->get_config("tcp_alert_fd",&tcpdemux::getInstance()->tcp_alert_fd,"File descriptor to send information about completed TCP flows");
   49 
   50         return;     /* No feature files created */
   51     }
   52 
   53     if(sp.phase==scanner_params::PHASE_SCAN){
   54     static const std::string hash0("<hashdigest type='TCPDEMUX'>");
   55     static const std::string hash1("</hashdigest>");
   56     return;
   57     }
   58 }