a 32-bit snapshot length” field;The snapshot length field should be the maximum number of bytes perpacket that will be captured. If the entire packet is captured, make it 65535; if you only capture, for example, the first 64 bytes of the packet, make it 64. 7、链路层类型:32位, ...
1 if the packet has been read without problems 0 if the timeout set withpcap_open_live()has elapsed. In this case pkt_header and pkt_data don't point to a valid packet -1 if an error occurred -2 if EOF was reached reading from an offline capture #include "common/PcapTools.h" int...
printf("fidn success: device :%s\n",dev); }//open the finded device(must set :ifconfig eth0 promisc)pcap_t* device=pcap_open_live(dev,65535,1,0,errbuf); if(!device){ printf("couldn't open the net device: %s\n",errbuf); return 1; } if(select=='Y') capture_packet2(device)...
a 32-bit snapshot length" field;The snapshot length field should be the maximum number of bytes perpacket that will be captured. If the entire packet is captured, make it 65535; if you only capture, for example, the first 64 bytes of the packet, make it 64. 7、链路层类型:32位, 数...
those capability bits to be given to particular accounts and to cause those bits to be set on a user's initial processes when they log in, in which case you must have CAP_NET_RAW in order to capture and CAP_NET_ADMIN to enumerate network devices with, for example, the -D flag). ...
* and 64-bit versions of libpcap, even if they're on the same platform, * should supply the appropriate version of "struct timeval", even if * that's not what the underlying packet capture mechanism supplies. */struct pcap_pkthdr{struct timeval ts;/* time stamp */bpf_u_int32 caplen...
flags: 最最重要的flag是用来指示适配器是否要被设置成混杂模式。 一般情况下,适配器只接收发给它自己的数据包, 而那些在其他机器之间通讯的数 4、据包,将会被丢弃。 相反,如果适配器是混杂模式,那么不管这个数据包是不是发给我的,我都会去捕获。也就是说,我会去捕获所有的数据包。 这意味着在一个共享媒介(...
If NULL is returned, pcap_geterr() can be used to get the error text. pcap_setnonblock() puts a capture descriptor, opened with pcap_open_live(), into ``non-blocking'' mode, or takes it out of ``non-blocking'' mode, depending on whether the nonblock argument is non-zero or zero...
* A null device name is equivalent to the"any"device. */if(device==NULL)device="any";#ifdef HAVE_DAG_APIif(strstr(device,"dag")){returndag_create(device, ebuf);}#endif /* HAVE_DAG_API */#ifdef HAVE_SEPTEL_APIif(strstr(device,"septel")){returnseptel_create(device, ebuf);}#...
3、flags是设置网络设备打开的状态的,最重要的是PCAP_OPENFLAG_PROMISCUOUS,表示这个网络设备以混杂模式打开,可以捕捉局域网中所有数据包。 4、read_timeout是设置延迟时间(milliseconds)用的。捕捉数据包的时候,延迟一定的时间,然后再调用内核中的程序,这样效率较高。0表示没有延迟,没有包到达的时候永...