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#include <iostream>
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#include <stdio.h>
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#include <string>
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#include <vector>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <net/bpf.h>
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#include <pcap.h>
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pcap_t* create(const std::string& name,
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const std::string& pcapFilter,
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uint32_t snapLen, bool promisc);
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bool capture(pcap_t * pcapSession);
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void close(pcap_t* pcapSession);
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int main(int argc, char** argv)
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{
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if (argc != 3)
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{
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std::cerr << "Usage: libpcaptest <interface> <filter>"
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<< std::endl;
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return 1;
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}
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std::string name(argv[1]), filter(argv[2]);
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std::cout << "Capturing from '" << name << " with filter "
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<< filter << std::endl;
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pcap_t * pcapSession = create(name, filter, 128, true);
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capture(pcapSession);
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close(pcapSession);
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return 0;
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}
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/**
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This is the callback
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**/
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void test_pcap_handler(u_char* user, const struct pcap_pkthdr* header,
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const u_char* pkt_data)
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{
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std::cout << "Packet captured" << std::endl;
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}
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/**
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Temporary used since on Windows they forgot to sign as 'const char*'
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the filter string provided to pcap_compile...
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**/
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void duplicateFilterString(const std::string& pcapFilter,
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std::vector<char>& dupFilter)
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{
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dupFilter.clear();
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dupFilter.resize(pcapFilter.size()+1, 0);
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for (uint32_t i=0; i<pcapFilter.size(); ++i)
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dupFilter[i] = pcapFilter[i];
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}
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void close(pcap_t* pcapSession)
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{
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if (pcapSession)
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{
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pcap_close(pcapSession);
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}
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}
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pcap_t* create(const std::string& name,
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const std::string& pcapFilter,
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uint32_t snapLen, bool promisc)
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{
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char errbuf[PCAP_ERRBUF_SIZE];
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pcap_t* pcapSession;
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if ((pcapSession = pcap_open_live(name.c_str(),
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snapLen, promisc ? 1 : 0, 1000, errbuf)) == NULL)
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{
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std::cerr << "Failed pcap_open_live because <"
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<<errbuf<<">" << std::endl;
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return NULL;
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}
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// compile the filter if it's been supplied or snapLen is provided
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if (pcapFilter.empty()==false || snapLen<65535)
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{
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// get netmask
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bpf_u_int32 pcapNetaddr, pcapMask;
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pcap_lookupnet(name.c_str(), &pcapNetaddr, &pcapMask, errbuf);
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struct bpf_program pcapFilterProgram;
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std::vector<char> filterDup;
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duplicateFilterString(pcapFilter, filterDup);
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if (pcap_compile(pcapSession, &pcapFilterProgram,
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&filterDup[0], 1, pcapMask) == -1)
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{
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std::string error = pcap_geterr(pcapSession);
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pcap_close(pcapSession);
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std::cerr << "Failed pcap_compile because <"
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<<errbuf<<">" << std::endl;
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return NULL;
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}
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if (pcap_setfilter(pcapSession, &pcapFilterProgram) == -1)
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{
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std::string error = pcap_geterr(pcapSession);
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pcap_freecode(&pcapFilterProgram);
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pcap_close(pcapSession);
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std::cerr << "Failed pcap_setfilter because <"
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<<errbuf<<">" << std::endl;
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return NULL;
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}
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pcap_freecode(&pcapFilterProgram);
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}
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// set session in non blocking mode
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if (pcap_setnonblock(pcapSession, 1, errbuf)!=0)
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{
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pcap_close(pcapSession);
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std::cerr << "Failed pcap_setnonblock because <"
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<<errbuf<<">" << std::endl;
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return NULL;
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}
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/*
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Enable this for immediate delivery of packets through callback.
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uint32_t v = 1;
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if (ioctl(pcap_fileno(pcapSession), BIOCIMMEDIATE, &v) < 0) {
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pcap_close(pcapSession);
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std::cerr << "Failed ioctl BIOCIMMEDIATE" << std::endl;
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return NULL;
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}
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*/
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int dlt;
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const char *dlt_name;
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dlt = pcap_datalink(pcapSession);
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dlt_name = pcap_datalink_val_to_name(dlt);
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if (dlt_name == NULL) {
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(void)fprintf(stderr,
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"listening on %s, link-type %u, capture size %u bytes\n",
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name.c_str(), dlt, snapLen);
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} else {
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(void)fprintf(stderr,
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"listening on %s, link-type %s (%s), capture size %u bytes\n",
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name.c_str(), dlt_name,
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pcap_datalink_val_to_description(dlt), snapLen);
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}
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return pcapSession;
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}
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bool capture(pcap_t * pcapSession)
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{
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struct pcap_stat pcapStats;
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while (true)
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{
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int32_t ret = pcap_dispatch(pcapSession, 100,
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test_pcap_handler, (u_char*)NULL);
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std::cout << "Read " << ret << " packets" << std::endl;
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if (pcap_stats(pcapSession, &pcapStats) != 0)
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{
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std::string error = pcap_geterr(pcapSession);
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std::cerr << "Failed pcap_setnonblock because <"
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<<error<<">" << std::endl;
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return false;
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}
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std::cout << "ReceivedPackets " << pcapStats.ps_recv <<
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" DroppedPackets " << pcapStats.ps_drop <<
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" I/F DroppedPackets " << pcapStats.ps_ifdrop << std::endl;
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if (ret==-1)
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{
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std::string error = pcap_geterr(pcapSession);
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std::cerr << "Failed pcap_dispatch because <"<<error<<">" << std::endl;
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return NULL;
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}
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sleep(5);
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}
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return true;
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}
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