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  1. #include<iostream>
  2. #include<queue>
  3. #include<string>
  4. #include<fstream>
  5.  
  6. std::string getProtocolOf(const char * frame){
  7.  
  8.     enum Transport {
  9.         TCP = 6,
  10.         UDP = 17
  11.     };
  12.  
  13.     enum FrameType {
  14.         IP   = 0x0800,
  15.         IP6  = 0x86dd
  16.     };
  17.  
  18.     typedef unsigned char uchar;
  19.  
  20.     const char* ipVerString;
  21.     const char* tpProtoString;
  22.  
  23.     const char* p;
  24.     const char* pIP = frame + 14;
  25.  
  26.     p = frame + (6 + 6); // dst + src
  27.  
  28.     // AF in Mac
  29.     switch( (unsigned short)( (*p) << 8 | *(p+1) ) ){
  30.         default: return "not IP";
  31.         case IP:  break;
  32.         case IP6: break;
  33.     }
  34.  
  35.     p = pIP;
  36.  
  37.     // Ver in IP
  38.     switch( (uchar)( ( *p >> 4 ) & 0x0f ) ){
  39.         default: return "IP? Unknown";
  40.         case 0x4: p = pIP + 9; ipVerString = "IPv4"; break;
  41.         case 0x6: p = pIP + 6; ipVerString = "IPv6"; break;
  42.     }
  43.  
  44.     // Proto in IP
  45.     switch( (uchar)*p ){
  46.         default:  tpProtoString = "not TCP/UDP"; break;
  47.         case TCP: tpProtoString = "TCP"; break;
  48.         case UDP: tpProtoString = "UDP "; break;
  49.     }
  50.  
  51.     return std::string(ipVerString) + " " + tpProtoString;
  52. }
  53.  
  54. const int kSizeRead = 32;
  55.  
  56. int main ( int argc, char** argv ){
  57.  
  58.     std::queue<std::string> queue;
  59.  
  60.     // push to queue
  61.     for( int i = 1; i < argc; i++ ){
  62.         char frame[kSizeRead];
  63.         std::ifstream(argv[i]).read(frame,sizeof(frame));
  64.         queue.push( getProtocolOf(frame) );
  65.     }
  66.  
  67.     // extract
  68.     for( ; !queue.empty(); queue.pop() )
  69.         std::cout << queue.front() << std::endl;
  70.  
  71.     return 0; 
  72. }
  73.  
Success #stdin #stdout 0s 3476KB
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https://ideone.com/ovfalF
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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