tcpdump mailing list archives
Compatibility Libpcap/Winpcap and timout of pcap_next_ex().
From: Benoit <benpaka.spam () gmail com>
Date: Tue, 27 Jan 2009 18:17:00 +0100
Hello, I've start a simple protocol to communicate with FPGA using only MAC layer. This software should run under linux and windows, however i've a problem with the timeout of pcap_next_ex() function under linux. With winpcap when a packet is not coming the pcap_next_ex() return 0 but in linux this function continue looping, and never return if no packet are coming. Moreover sometimes I need to loop 10 times to be sure to receive correctly the packet, . The library used is the one in ubuntu 8.10: libpcap0.8, libpcap0.8-dev, libpcap0.8-dbg (Version 0.9.8-5) Here you have a sample of my code: //Opening interface timeout=10; adhandle = pcap_open_live(ifname, // name of the device SIZEIB_MTU, // portion of the packet to capture FALSE, // promiscuous mode timeout, // read timeout (char*)errbuf // error buffer ); //Setting filter if(pcap_compile(adhandle,&(fp),(char*)filter,0,netp) == -1) { fprintf(stderr,"Error calling pcap_compile\n"); return EXIT_FAILURE; } if(pcap_setfilter(adhandle,&(fp)) == -1) { fprintf(stderr,"Error setting filter\n"); return EXIT_FAILURE; } //Send a packet pcap_sendpacket(adhandle,(const u_char*)buff, SIZEIB_HDR_PKT+size_inB); //Loop 10 times on pcap_next_ex() to receive at least 1 packet. for(i=0;i<10;i++) { ret=pcap_next_ex(adhandle, &(header), (const u_char**)(&p_buff)); if(ret>0) { nofB=ifhard->header->len; memcpy(buff,p_buff,nofB); break; } } Can you help me to make the timeout of pcap_next_ex() works under linux? Thanks -- Benoit RAT www.neub.co.nr - This is the tcpdump-workers list. Visit https://cod.sandelman.ca/ to unsubscribe.
Current thread:
- Compatibility Libpcap/Winpcap and timout of pcap_next_ex(). Benoit (Jan 27)
- Re: Compatibility Libpcap/Winpcap and timout of pcap_next_ex(). Guy Harris (Jan 27)
- Re: Compatibility Libpcap/Winpcap and timout of Matthew Luckie (Jan 27)
- Re: Compatibility Libpcap/Winpcap and timout of Guy Harris (Jan 27)
- Re: Compatibility Libpcap/Winpcap and timout of Aaron Turner (Jan 27)
- Re: Compatibility Libpcap/Winpcap and timout of Guy Harris (Jan 27)
- Re: Compatibility Libpcap/Winpcap and timout of Benoit (Jan 28)
- Re: Compatibility Libpcap/Winpcap and timout of Guy Harris (Jan 28)
- Re: Compatibility Libpcap/Winpcap and timout of Matthew Luckie (Jan 27)
- Re: Compatibility Libpcap/Winpcap and timout of pcap_next_ex(). Guy Harris (Jan 27)