网卡流量探测器

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流沙团 • • C/C++ • 4707View 0

只是一个简单的demo

可以优化的更好

(思路: 上行展示, 下行展示)


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001// NetSpeed.cpp : Defines the entry point for the console application.
002//
003 
004#include "stdafx.h"
005#include <pcap.h>
006#include <remote-ext.h>
007#include <Winsock2.h>
008#pragma comment(lib,"wpcap.lib")
009#pragma comment(lib,"ws2_32.lib")
010 
011timeval timebegin={0};
012timeval timeend={0};
013int ktime = 0;
014int Capturelen = 0;
015/* packet handler 函数原型 */
016void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data);
017 
018main()
019{
020pcap_if_t *alldevs;
021pcap_if_t *d;
022int inum;
023int i=0;
024pcap_t *adhandle;
025char errbuf[PCAP_ERRBUF_SIZE];
026     
027    /* 获取本机设备列表 */
028    if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1)
029    {
030        fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf);
031        return 0;
032    }
033     
034    /* 打印列表 */
035    for(d=alldevs; d; d=d->next)
036    {
037        printf("%d. %s", ++i, d->name);
038        if (d->description)
039            printf(" (%s)\n", d->description);
040        else
041            printf(" (No description available)\n");
042    }
043     
044    if(i==0)
045    {
046        printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
047        return -1;
048    }
049     
050    printf("Enter the interface number (1-%d):",i);
051    scanf("%d", &inum);
052     
053    if(inum < 1 || inum > i)
054    {
055        printf("\nInterface number out of range.\n");
056        /* 释放设备列表 */
057        pcap_freealldevs(alldevs);
058        return -1;
059    }
060     
061    /* 跳转到选中的适配器 */
062    for(d=alldevs, i=0; i< inum-1 ;d=d->next, i++);
063     
064    /* 打开设备 */
065    if ( (adhandle= pcap_open(d->name,          // 设备名
066                              65536,            // 65535保证能捕获到不同数据链路层上的每个数据包的全部内容
067                                 PCAP_OPENFLAG_PROMISCUOUS,    // 混杂模式
068                              1000,             // 读取超时时间
069                              NULL,             // 远程机器验证
070                              errbuf            // 错误缓冲池
071                              ) ) == NULL)
072    {
073        fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n", d->name);
074        /* 释放设备列表 */
075        pcap_freealldevs(alldevs);
076        return -1;
077    }
078     
079    printf("\nlistening on %s...\n", d->description);
080     
081    /* 释放设备列表 */
082    pcap_freealldevs(alldevs);
083     
084    /* 开始捕获 */
085    pcap_loop(adhandle, 0, packet_handler, NULL);
086     
087    return 0;
088}
089 
090 
091/* 每次捕获到数据包时，libpcap都会自动调用这个回调函数 */
092void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data)
093{
094    struct tm *ltime;
095    char timestr[16];
096    time_t local_tv_sec;
097    if(ktime == 0)
098    {
099         timebegin = header->ts;
100         timeend = header->ts;
101         ktime++;
102         return;
103    }
104    timeend = header->ts;
105    /* 将时间戳转换成可识别的格式 */
106    local_tv_sec = header->ts.tv_sec;
107    ltime=localtime(&local_tv_sec);
108    strftime( timestr, sizeof timestr, "%H:%M:%S", ltime);
109    //printf("%s,%.6d len:%d\n", timestr, header->ts.tv_usec, header->len);
110     
111     Capturelen += header->caplen;
112    /*
113    float timeSec  = (float)header->ts.tv_sec + (header->ts.tv_usec/1000);
114    printf("sec: %d , microsec %d \n",header->ts.tv_sec,header->ts.tv_usec);
115    printf("len: %d , time: %.1f \n",Capturelen,timeSec);
116    */
117    int timeSec = (timeend.tv_sec-timebegin.tv_sec)*1000000 + timeend.tv_usec - timebegin.tv_usec;
118     
119    /*
120 
121    */
122    if(timeSec > 1000000)
123    {
124        float speed  = (float)Capturelen/timeSec*1000000;
125        //printf("speed is:  %.1f B/s \n",speed);
126         
127        if(speed>=0.0 && speed <1024.0)
128        {
129            printf("speed is:  %.1f B/s \n",speed);
130        }else if(speed>=1024.0 && speed< 1024*1024)
131        {
132            printf("speed is: %.1f KB/s \n",speed/1024);
133        }else if(speed>=1024*1024 && speed< 1024*1024*1024)
134        {
135            printf("speed is: %.1f MB/s \n",speed/1024/1024);
136        }
137        timebegin = timeend;
138        Capturelen = 0;
139 
140    }
141}

原文链接： 网卡流量探测器 版权所有，转载时请注明出处，违者必究。
注明出处格式：流沙团 ( http://www.gyarmy.com/?post=453 )

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