Qt-WinPcap发送和接收Arp包

#include "cwinpcaparp.h" CWinPcapArp::CWinPcapArp(QObject *parent) : QObject(parent) { this->countDev = 0; /* 申请内存存放IP地址 */ ip_addr = (char*)malloc(sizeof(char)*16); if(ip_addr == NULL) { printf("apply for memary faild:ip addr\n"); return; } else { printf("apply for memary successful:ip addr\n"); } /* 申请内存存放NETMASK地址 */ ip_netmask = (char*)malloc(sizeof(char)*16); if(ip_netmask == NULL) { printf("apply for memary faild:net mask\n"); return; } else { printf("apply for memary successful:net mask\n"); } /* 申请内存存放MAC地址 */ ip_mac = (unsigned char*)malloc(sizeof(unsigned char)*6); if(ip_mac == NULL) { printf("apply for memary faild:MAC\n"); } else { printf("apply for memary successful:MAC\n"); } } CWinPcapArp::~CWinPcapArp() { } void CWinPcapArp::GetAllDevs() { /* 获取本地适配器列表 */ if(pcap_findalldevs(&alldevs,errbuf) == -1) { /* 结果为-1代表出现获取适配器列表失败 */ fprintf(stderr,"Error in pcap_findalldevs_ex:\n",errbuf); /* exit(0)代表正常退出,exit(other)为非正常退出,这个值会传给操作系统 */ return; } for(dev = alldevs;dev !=NULL;dev = dev->next) { printf("--number:%d\n--name:%s\n",++countDev,dev->name); if(dev->description) { //打印适配器的描述信息 printf("description:%s\n",dev->description); }else{ //适配器不存在描述信息 printf("description:%s","no description\n"); } //打印本地环回地址 printf("\tLoopback: %s\n",(dev->flags & PCAP_IF_LOOPBACK)?"yes":"no"); /** pcap_addr * next 指向下一个地址的指针 sockaddr * addr IP地址 sockaddr * netmask 子网掩码 sockaddr * broadaddr 广播地址 sockaddr * dstaddr 目的地址 */ pcap_addr_t *a; /* 网络适配器的地址用来存储变量 */ for(a = dev->addresses;a;a = a->next){ /* sa_family代表了地址的类型,是IPV4地址类型还是IPV6地址类型 */ switch (a->addr->sa_family) { case AF_INET: /* 代表IPV4类型地址 */ printf("Address Family Name:AF_INET\n"); if(a->addr){ /* ->的优先级等同于括号,高于强制类型转换,因为addr为sockaddr类型，对其进行操作须转换为sockaddr_in类型 */ printf("Address:%s\n",iptos(((struct sockaddr_in *)a->addr)->sin_addr.s_addr)); } if (a->netmask){ printf("Netmask: %s\n",iptos(((struct sockaddr_in *)a->netmask)->sin_addr.s_addr)); } if (a->broadaddr){ printf("Broadcast Address: %s\n",iptos(((struct sockaddr_in *)a->broadaddr)->sin_addr.s_addr)); } if (a->dstaddr){ printf("Destination Address: %s\n",iptos(((struct sockaddr_in *)a->dstaddr)->sin_addr.s_addr)); } break; case AF_INET6: /* 代表IPV6类型地址 */ printf("Address Family Name:AF_INET6\n"); printf("this is an IPV6 address\n"); break; default: break; } } } /* i为0代表上述循环未进入,即没有找到适配器,可能的原因为Winpcap没有安装导致未扫描到 */ if(countDev == 0){ printf("interface not found,please check winpcap installation"); } /* 选中的适配器 */ for(dev=alldevs, countDev=0; countDev< 0/* 默认适配器序号 */; dev=dev->next, countDev++); /* 打开适配器 */ if((adhandle = pcap_open_live(dev->name, /* 设备名称 */ 65535, /* 存放数据包的内容长度 */ 1, /* 混杂模式 */ 1000, /* 超时时间 */ errbuf /* 错误缓冲 */ )) == NULL) { /* 打开适配器失败,打印错误并释放适配器列表 */ fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n", dev->name); /* 释放设备列表 */ pcap_freealldevs(alldevs); } ifget(dev,ip_addr, ip_netmask); /* 获取本地IP，子网掩码*/ GetSelfMac(adhandle,ip_addr,ip_mac);/* 获得本机MAC地址 */ /* 赋值 */ sp.adhandle = adhandle; sp.ip = ip_addr; sp.mac = this->ip_mac; sp.netmask = ip_netmask; gp.adhandle = adhandle; /* 创建线程发送和接收线程 */ sendthread = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)SendArpPacket,&sp,0,NULL); recvthread = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)GetLivePC, &gp,0,NULL); printf("\nlistening on net card %d ...\n", countDev); } /** * @brief CWinPcapArp::iptos u_long即为 unsigned long * @param in * @return */ char *CWinPcapArp::iptos(u_long in) { static char output[IPTOSBUFFERS][3*4+3+1]; static short which; u_char *p; p = (u_char *)&in; which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1); sprintf_s(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]); return output[which]; } /** * @brief CWinPcapArp::ifget 获取IP和子网掩码赋值为ip_addr和ip_netmask * @param d * @param ip_addr * @param ip_netmask */ void CWinPcapArp::ifget(pcap_if_t *d, char *ip_addr, char *ip_netmask) { pcap_addr_t *a; /* 遍历所有的地址,a代表一个pcap_addr */ for (a = d->addresses; a; a = a->next) { switch (a->addr->sa_family) { case AF_INET: /* sa_family ：是2字节的地址家族，一般都是“AF_xxx”的形式。通常用的都是AF_INET。代表IPV4 */ if (a->addr) { char *ipstr; /* 将地址转化为字符串 */ ipstr = iptos(((struct sockaddr_in *) a->addr)->sin_addr.s_addr); printf("ip str:%s\n",ipstr); memcpy(ip_addr, ipstr, 16); } if (a->netmask) { char *netmaskstr; netmaskstr = iptos(((struct sockaddr_in *) a->netmask)->sin_addr.s_addr); printf("netmask:%s\n",netmaskstr); memcpy(ip_netmask, netmaskstr, 16); } case AF_INET6: break; } } } /** * @brief CWinPcapArp::GetSelfMac 获取自己主机的MAC地址 * @param adhandle * @param ip_addr * @param ip_mac * @return */ int CWinPcapArp::GetSelfMac(pcap_t *adhandle, const char *ip_addr, unsigned char *ip_mac) { unsigned char sendbuf[42]; /* arp包结构大小 */ int i = -1; int res; EthernetHeader eh; /* 以太网帧头 */ Arpheader ah; /* ARP帧头 */ struct pcap_pkthdr * pkt_header; const u_char * pkt_data; /* 将已开辟内存空间 eh.dest_mac_add 的首 6个字节的值设为值 0xff */ memset(eh.DestMAC, 0xff, 6); /* 目的地址为全为广播地址 */ memset(eh.SourMAC, 0x0f, 6); memset(ah.DestMacAdd, 0x0f, 6); memset(ah.SourceMacAdd, 0x00, 6); /* htons将一个无符号短整型的主机数值转换为网络字节顺序 */ eh.EthType = htons(ETH_ARP); ah.HardwareType= htons(ARP_HARDWARE); ah.ProtocolType = htons(ETH_IP); ah.HardwareAddLen = 6; ah.ProtocolAddLen = 4; ah.SourceIpAdd