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ICMPTwistSocket Class Reference #include <ICMPTwistSocket.h> Collaboration diagram for ICMPTwistSocket: [legend]List of all members. Public Member Functions   ICMPTwistSocket (ISocketHandler &)   ~ICMPTwistSocket () void  OnRead () void  Connect (const std::string &) void  Send (const std::string &) void  OnOptions (int, int, int, SOCKET) Private Member Functions uint16_t  calc_crc (uint8_t *packet, size_t len) Private Attributes icmp_info  m_info uint16_t  m_seq_no Detailed Description Definition at line 64 of file ICMPTwistSocket.h. Constructor & Destructor Documentation ICMPTwistSocket::ICMPTwistSocket ( ISocketHandler &  h  )  File ......... ICMPTwistSocket.cpp Published .... 2004-07-03 Author ....... grymse@alhem.net Definition at line 35 of file ICMPTwistSocket.cpp. References ICMP_INFO_REQUEST, and m_info. : Socket(h) ,m_seq_no(0) { SOCKET s = CreateSocket(AF_INET, SOCK_RAW, "icmp"); if (s != INVALID_SOCKET) { // socket to filter out irrelevant ICMP, and make IO non-blocking static uint32_t flags = ~(1 << ICMP_INFO_REQUEST); if (setsockopt(s, SOL_RAW, ICMP_FILTER, &flags, sizeof(uint32_t)) == -1) { Handler().LogError(this, "setsockopt", errno, strerror(errno)); } Attach(s); Set(true, false, false); } memset(&m_info, 0, sizeof(m_info)); m_info.type = ICMP_INFO_REQUEST; } ICMPTwistSocket::~ICMPTwistSocket (  )  Definition at line 55 of file ICMPTwistSocket.cpp. { } Member Function Documentation void ICMPTwistSocket::OnRead (  )  Definition at line 60 of file ICMPTwistSocket.cpp. References icmp_info::buffer, calc_crc(), and m_info. { int len; int hsize; uint8_t incoming[1000]; if (recv(GetSocket(), m_info.buffer, 4, MSG_PEEK) != -1) { len = ntohs(*(uint16_t *)(m_info.buffer + 2)); if (len < 1000) { if (recv(GetSocket(), incoming, len, 0) == -1) { Handler().LogError(this, "recv", errno, strerror(errno), LOG_LEVEL_WARNING); } else { // IP Header length + ICMP header length hsize = (m_info.buffer[0] & 0xf) << 2; uint16_t crc; memcpy(&crc, incoming + hsize + 2, 2); if (calc_crc(incoming + hsize, len - hsize) != crc) //*(uint16_t *)(incoming + hsize + 2)) { printf("(Bad crc)\n"); } else { printf("Received: %s\n", incoming + hsize + 8); } } } } } void ICMPTwistSocket::Connect ( const std::string &   )  Definition at line 95 of file ICMPTwistSocket.cpp. Referenced by main(). { struct sockaddr_in dest; ipaddr_t a; if (Utility::u2ip(host, a)) { memset(&dest, 0, sizeof(dest)); dest.sin_port = htons(IPPROTO_ICMP); dest.sin_family = AF_INET; memcpy(&dest.sin_addr, &a, 4); if (connect(GetSocket(), (struct sockaddr *)&dest, sizeof(struct sockaddr)) == -1) { Handler().LogError(this, "Connect", errno, strerror(errno), LOG_LEVEL_FATAL); SetCloseAndDelete(); } } else { printf("u2ip failed\n"); } } void ICMPTwistSocket::Send ( const std::string &   )  Definition at line 119 of file ICMPTwistSocket.cpp. References icmp_info::buffer, calc_crc(), icmp_info::checksum, m_info, and m_seq_no. { strcpy(m_info.buffer, line.c_str()); int len = line.size() + 9; m_info.checksum = calc_crc((uint8_t *)&m_info, len); int n; if ((n = send(GetSocket(), (void *)&m_info, len, 0)) == -1) { Handler().LogError(this, "Send", errno, strerror(errno)); } m_info.seq_no = htons(m_seq_no++); } void ICMPTwistSocket::OnOptions ( int  , int  , int  , SOCKET    ) [inline] Definition at line 75 of file ICMPTwistSocket.h. {} uint16_t ICMPTwistSocket::calc_crc ( uint8_t *  packet, size_t  len   ) [private] Definition at line 133 of file ICMPTwistSocket.cpp. Referenced by OnRead(), and Send(). { uint16_t r; uint16_t i; uint32_t s; s = (packet[0] << 8) + packet[1]; for (i = 4; i < len - 1; i += 2) { s += (packet[i] << 8) + packet[i + 1]; } if (len % 2) // an extra member { s += packet[len - 1] << 8; } s = (s & 0xffff) + (s >> 16); r = s + (s >> 16); return htons(~r); } Member Data Documentation struct icmp_info ICMPTwistSocket::m_info [read, private] Definition at line 79 of file ICMPTwistSocket.h. Referenced by ICMPTwistSocket(), OnRead(), and Send(). uint16_t ICMPTwistSocket::m_seq_no [private] Definition at line 80 of file ICMPTwistSocket.h. Referenced by Send(). The documentation for this class was generated from the following files: ICMPTwistSocket.h ICMPTwistSocket.cpp

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