@@ -1,3 +1,4 @@

 all:

 	gcc -o list list.c -lpcap

 	gcc -o address address.c -lpcap

+	gcc -o sniffing sniffing.c -lpcap

new file mode 100644

@@ -0,0 +1,68 @@

+/*!

+ *  @file    sniffing.c

+ *  @author  HiSEON (ikseon@nepirity.com)

+ *

+ *  @internal

+ *       Created:  2018년 03월 20일

+ *     Copyright:  Copyright (c) 2018, Kang IkSeon

+ */

+

+#include <stdio.h>

+#include <string.h>

+

+#include <netinet/in.h>

+#include <arpa/inet.h>

+

+#include <pcap.h>

+

+void packet_handler(u_char *param,

+  const struct pcap_pkthdr *header, const u_char *pkt_data) {

+  printf("caplen : %d\n", header->caplen);

+  printf("len : %d\n", header->len);

+}

+

+int main(int argc, char **argv) {

+    pcap_t *adhandle;

+    char errbuf[PCAP_ERRBUF_SIZE];

+    pcap_if_t *alldevs;

+    pcap_if_t *d;

+    struct pcap_addr *a;

+    int i = 0;

+    int no;

+

+    if (pcap_findalldevs(&alldevs, errbuf) < 0) {

+        printf("pcap_findalldevs error\n");

+        return 1;

+    }

+

+    for (d=alldevs; d; d=d->next) {

+        printf("%d :  %s\n", ++i, (d->description)?(d->description):(d->name));

+    }

+

+    printf("number : ");

+    scanf("%d", &no);

+

+    if (!(no > 0 && no <= i)) {

+        printf("number error\n");

+        return 1;

+    }

+

+    for (d=alldevs, i=0; d; d=d->next) {

+        if (no == ++i)  break;

+    }

+

+    if (!(adhandle= pcap_open_live(d->name, 65536, 1, 1000, errbuf))) {

+        printf("pcap_open_live error %s\n", d->name);

+        pcap_freealldevs(alldevs);

+        return -1;

+    }

+

+    pcap_freealldevs(alldevs);

+

+    pcap_loop(adhandle, 0, packet_handler, NULL);

+

+    pcap_close(adhandle);

+

+    return 0;

+}

+