#ifdef USE_LIBPCAP
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pcap/pcap.h>
#include "pktlib.h"
#include "lib.h"
#define BUFFER_SIZE 65536
struct _pktif {
 struct _pktif_base base; /* 共通領域は先頭に置く必要がある */
 struct { /* インターフェースのlibpcap依存部分 */
 pcap_t *pcap_handle;
 char errbuf[PCAP_ERRBUF_SIZE];
#ifdef USE_WINPCAP
 char *ifname;
#endif
 } libpcap;
};
#ifdef USE_WINPCAP
static char *interface_search(pktif_t pktif, char *ifname)
{
 pcap_if_t *alldevs;
 pcap_if_t *d;
 int i, n = -1;
 if (ifname[0] != '-') n = atoi(ifname);
 if (pcap_findalldevs(&alldevs, pktif->libpcap.errbuf) < 0) pktlib_error_exit("Cannot find devices.\n"); if (n < 0) { fprintf(stderr, "Available interface list:\n"); } pktif->libpcap.ifname = NULL;
 i = 0;
 for (d = alldevs; d; d = d->next) {
 if (n < 0) { fprintf(stderr, "\t%d\t%s\n", i, d->description ? d->description : "No description");
 } else {
 if (i == n) {
	pktif->libpcap.ifname = strdup(d->name);
	break;
 }
 }
 i++;
 }
 pcap_freealldevs(alldevs);
 return pktif->libpcap.ifname;
}
#endif
pktif_t pktif_open(char *ifname, unsigned long flags, int option_size)
{
 pktif_t pktif;
 int size, fd, linktype, buffer_size = BUFFER_SIZE;
 pcap_t *pcap_handle;
 size = sizeof(*pktif) + option_size + strlen(ifname) + 1;
 pktif = malloc(size);
 memset(pktif, 0, size);
#ifdef USE_WINPCAP
 ifname = interface_search(pktif, ifname);
 if (ifname == NULL)
 pktlib_error_exit("Unknown interface.\n");
#endif
 pcap_handle = pcap_open_live(ifname, buffer_size,
			 !(flags & PKTIF_OPEN_FLAG_RECV_NOTPROM) ? 1 : 0,
			 50, pktif->libpcap.errbuf);
 if (pcap_handle == NULL)
 pktlib_error_exit("Cannot open libpcap.\n");
 /* 情報の取得 */
#ifndef USE_WINPCAP
 fd = pcap_get_selectable_fd(pcap_handle);
#else
 fd = -1;
 flags &#124;= PKTIF_OPEN_FLAG_SELECT_DISABLE;
#endif
 if (fd < 0) flags &#124;= PKTIF_OPEN_FLAG_SELECT_NOSELECT; /* 受信関連の設定 */ #ifndef USE_WINPCAP if (flags & PKTIF_OPEN_FLAG_RECV_NOTSENT) { if (pcap_setdirection(pcap_handle, PCAP_D_IN) < 0) pktlib_error_exit("Fail to libpcap setdirection.\n"); } #endif /* リンクタイプの取得 */ linktype = pcap_datalink(pcap_handle); pktif->base.next = NULL;
 pktif->base.name = (char *)(pktif + 1) + option_size;
 strcpy(pktif->base.name, ifname);
 pktif->base.fd = fd;
 pktif->base.flags = flags;
 pktif->base.linktype = linktype;
 pktif->base.buffer_size = buffer_size;
 pktif->base.option = (option_size> 0) ? (pktif + 1) : NULL;
 pktif->libpcap.pcap_handle = pcap_handle;
 pktlib_iflist_set(pktif); /* select()のためにリンクリストに接続する */
 return pktif;
}
int pktif_is_empty(pktif_t pktif)
{
 return 1; /* BPFとの整合性のための関数.常に1を返す */
}
struct recv_userdata {
 struct pcap_pkthdr *header;
 const unsigned char **buffer;
};
static void recv_proc(unsigned char *user,
		 const struct pcap_pkthdr *header,
		 const unsigned char *buffer)
{
 struct recv_userdata *rud = (struct recv_userdata *)user;
 memcpy(rud->header, header, sizeof(*(rud->header)));
 *(rud->buffer) = buffer;
}
int pktif_recv(pktif_t pktif, char *buffer, int size, struct timeval *tm)
{
 int r;
 const unsigned char *pktbuf;
 struct pcap_pkthdr header;
 struct recv_userdata rud;
 rud.header = &header;
 rud.buffer = &pktbuf;
 r = pcap_loop(pktif->libpcap.pcap_handle, 1, recv_proc,
		(unsigned char *)&rud);
 if (r < 0) pktlib_error_exit("Interface down.\n"); if (tm) { tm->tv_sec = header.ts.tv_sec;
 tm->tv_usec = header.ts.tv_usec;
 }
 r = header.caplen;
 if (r>= size)
 pktlib_error_exit("Out of buffer.\n");
 memcpy(buffer, pktbuf, r);
 return r;
}
int pktif_send(pktif_t pktif, char *buffer, int size)
{
 int r;
 r = pcap_sendpacket(pktif->libpcap.pcap_handle,
		 (unsigned char *)buffer, size);
 return (r < 0) ? -1 : size;
}
#endif
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