int
pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header, u_char **pkt_data)
{
/* Check the capture type */
#ifdef HAVE_REMOTE
if (p->rmt_clientside)
{
/* We are on an remote capture */
if (!p->rmt_capstarted)
{
// if the capture has not started yet, please start it
if (pcap_startcapture_remote(p) )
return -1;
p->rmt_capstarted= 1;
}
return pcap_next_ex_remote(p, pkt_header, pkt_data);
}
#endif
if (p->adapter!=NULL)
{
/* We are on a live capture */
int cc;
int n = 0;
register u_char *bp, *ep;
cc = p->cc;
if (p->cc == 0)
{
/* capture the packets */
if(PacketReceivePacket(p->adapter, p->Packet, TRUE) == FALSE)
{
sprintf(p->errbuf, "read error: PacketReceivePacket failed");
return (-1);
}
cc = p->Packet->ulBytesReceived;
bp = p->Packet->Buffer;
}
else
bp = p->bp;
/*
* Loop through each packet.
*/
ep = bp + cc;
if (bp < ep)
{
register int caplen, hdrlen;
caplen = ((struct bpf_hdr *)bp)->bh_caplen;
hdrlen = ((struct bpf_hdr *)bp)->bh_hdrlen;
/*
* XXX A bpf_hdr matches a pcap_pkthdr.
*/
*pkt_header = (struct pcap_pkthdr*)bp;
*pkt_data = bp + hdrlen;
bp += BPF_WORDALIGN(caplen + hdrlen);
p->bp = bp;
p->cc = ep - bp;
return (1);
}
else{
p->cc = 0;
return (0);
}
}
else
{
/* We are on an offline capture */
struct bpf_insn *fcode = p->fcode.bf_insns;
int status;
int n = 0;
struct pcap_pkthdr *h=(struct pcap_pkthdr*)(p->buffer+p->bufsize-sizeof(struct pcap_pkthdr));
while (1)
{
status = sf_next_packet(p, h, p->buffer, p->bufsize);
if (status==1)
/* EOF */
return (-2);
if (status==-1)
/* Error */
return (-1);
if (fcode == NULL ||
bpf_filter(fcode, p->buffer, h->len, h->caplen))
{
*pkt_header = h;
*pkt_data = p->buffer;
return (1);
}
}
}
}
int
pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
int cc;
int n = 0;
register u_char *bp, *ep;
#ifdef REMOTE
if (p->rmt_clientside)
{
/* We are on an remote capture */
if (!p->rmt_capstarted)
{
// if the capture has not started yet, please start it
if (pcap_startcapture_remote(p) )
return -1;
p->rmt_capstarted= 1;
}
return pcap_read_remote(p, cnt, callback, user);
}
#endif
cc = p->cc;
if (p->cc == 0) {
/* capture the packets */
if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
return (-1);
}
cc = p->Packet->ulBytesReceived;
bp = p->Packet->Buffer;
}
else
bp = p->bp;
/*
* Loop through each packet.
*/
#define bhp ((struct bpf_hdr *)bp)
ep = bp + cc;
while (bp < ep) {
register int caplen, hdrlen;
caplen = bhp->bh_caplen;
hdrlen = bhp->bh_hdrlen;
/*
* XXX A bpf_hdr matches a pcap_pkthdr.
*/
(*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
bp += BPF_WORDALIGN(caplen + hdrlen);
if (++n >= cnt && cnt > 0) {
p->bp = bp;
p->cc = ep - bp;
return (n);
}
}
#undef bhp
p->cc = 0;
return (n);
}
