140 lines
3.3 KiB
C++
140 lines
3.3 KiB
C++
#include "Icmp.h"
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#include "Arp.h"
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#define NET_DEBUG DEBUG
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IcmpSocket::IcmpSocket(TinyIP* tip) : Socket(tip)
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{
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Type = IP_ICMP;
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Enable = true;
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}
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bool IcmpSocket::Process(Stream* ms)
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{
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ICMP_HEADER* icmp = ms->Retrieve<ICMP_HEADER>();
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if(!icmp) return false;
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uint len = ms->Remain();
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if(OnPing)
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{
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// 返回值指示是否向对方发送数据包
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bool rs = OnPing(this, icmp, icmp->Next(), len);
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if(!rs) return true;
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}
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else
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{
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#if NET_DEBUG
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if(icmp->Type != 0)
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debug_printf("Ping From "); // 打印发方的ip
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else
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debug_printf("Ping Reply "); // 打印发方的ip
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Tip->ShowIP(Tip->RemoteIP);
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debug_printf(" Payload=%d ", len);
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// 越过2个字节标识和2字节序列号
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debug_printf("ID=0x%04X Seq=0x%04X ", __REV16(icmp->Identifier), __REV16(icmp->Sequence));
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Sys.ShowString(icmp->Next(), len);
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debug_printf(" \r\n");
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#endif
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}
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// 只处理ECHO请求
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if(icmp->Type != 8) return true;
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icmp->Type = 0; // 响应
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// 因为仅仅改变类型，因此我们能够提前修正校验码
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icmp->Checksum += 0x08;
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// 这里不能直接用sizeof(ICMP_HEADER)，而必须用len，因为ICMP包后面一般有附加数据
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Tip->SendIP(IP_ICMP, (byte*)icmp, icmp->Size() + len);
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return true;
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}
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bool PingCallback(TinyIP* tip, void* param, Stream& ms)
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{
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ETH_HEADER* eth = (ETH_HEADER*)tip->Buffer;
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IP_HEADER* _ip = (IP_HEADER*)eth->Next();
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if(eth->Type == ETH_IP && _ip->Protocol == IP_ICMP)
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{
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ICMP_HEADER* icmp = (ICMP_HEADER*)_ip->Next();
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int* ps = (int*)param;
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uint ip = ps[0];
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ushort id = ps[1];
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ushort seq = ps[2];
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if(icmp->Identifier == id && icmp->Sequence == seq
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&& _ip->DestIP == tip->IP
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&& _ip->SrcIP == ip)
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{
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return true;
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}
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}
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return false;
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}
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// Ping目的地址，附带a~z重复的负载数据
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bool IcmpSocket::Ping(IPAddress ip, uint payloadLength)
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{
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/*assert_ptr(Tip->Arp);
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ArpSocket* arp = (ArpSocket*)Tip->Arp;
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const MacAddress* mac = arp->Resolve(ip);
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if(!mac)
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{
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#if NET_DEBUG
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debug_printf("No Mac For ");
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Tip->ShowIP(ip);
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debug_printf("\r\n");
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#endif
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return false;
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}
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Tip->RemoteMac = *mac;*/
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Tip->RemoteIP = ip;
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byte buf[sizeof(ETH_HEADER) + sizeof(IP_HEADER) + sizeof(ICMP_HEADER) + 64];
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uint bufSize = ArrayLength(buf);
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// 注意，此时指针位于0，而内容长度为缓冲区长度
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Stream ms(buf, bufSize);
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ETH_HEADER* eth = (ETH_HEADER*)buf;
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IP_HEADER* _ip = (IP_HEADER*)eth->Next();
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ICMP_HEADER* icmp = (ICMP_HEADER*)_ip->Next();
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icmp->Init(true);
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icmp->Type = 8;
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icmp->Code = 0;
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byte* data = icmp->Next();
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for(int i=0, k=0; i<payloadLength; i++, k++)
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{
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if(k >= 23) k-=23;
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*data++ = ('a' + k);
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}
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//ushort now = Time.Current() / 1000;
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ushort now = Time.Current() >> 10;
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ushort id = __REV16(Sys.ID[0]);
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ushort seq = __REV16(now);
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icmp->Identifier = id;
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icmp->Sequence = seq;
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icmp->Checksum = 0;
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icmp->Checksum = __REV16(Tip->CheckSum((byte*)icmp, sizeof(ICMP_HEADER) + payloadLength, 0));
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#if NET_DEBUG
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debug_printf("Ping ");
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Tip->ShowIP(ip);
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debug_printf(" with Identifier=0x%04x Sequence=0x%04x\r\n", id, seq);
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#endif
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Tip->SendIP(IP_ICMP, (byte*)icmp, sizeof(ICMP_HEADER) + payloadLength);
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// 等待时间
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int ps[] = {ip, id, seq};
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if(Tip->LoopWait(PingCallback, ps, 1000)) return true;
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return false;
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}
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