network arplab finished

2025-11-17 22:22:52 +08:00
parent ecb6ef0a65
commit 8d9c3ed7f6
411 changed files with 42460 additions and 1 deletions
--- a/network/start/lib/npcap/Examples-remote/misc/savedump.c
+++ b/network/start/lib/npcap/Examples-remote/misc/savedump.c
@@ -0,0 +1,110 @@
+#include <pcap.h>
+#include "misc.h"
+
+/* prototype of the packet handler */
+void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data);
+
+int main(int argc, char **argv)
+{
+pcap_if_t *alldevs;
+pcap_if_t *d;
+int inum;
+int i=0;
+pcap_t *adhandle;
+char errbuf[PCAP_ERRBUF_SIZE];
+pcap_dumper_t *dumpfile;
+
+    /* Load Npcap and its functions. */
+    if (!LoadNpcapDlls())
+    {
+        fprintf(stderr, "Couldn't load Npcap\n");
+        exit(1);
+    }
+
+    /* Check command line */
+	if(argc != 2)
+	{
+        printf("usage: %s filename", argv[0]);
+        return -1;
+    }
+    
+	/* Retrieve the device list on the local machine */
+	if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1)
+	{
+		fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf);
+		exit(1);
+	}
+    
+    /* Print the list */
+    for(d=alldevs; d; d=d->next)
+    {
+        printf("%d. %s", ++i, d->name);
+        if (d->description)
+            printf(" (%s)\n", d->description);
+        else
+            printf(" (No description available)\n");
+    }
+
+    if(i==0)
+    {
+        printf("\nNo interfaces found! Make sure Npcap is installed.\n");
+        return -1;
+    }
+    
+    printf("Enter the interface number (1-%d):",i);
+    scanf_s("%d", &inum);
+    
+    if(inum < 1 || inum > i)
+    {
+        printf("\nInterface number out of range.\n");
+        /* Free the device list */
+        pcap_freealldevs(alldevs);
+        return -1;
+    }
+		
+	/* Jump to the selected adapter */
+    for(d=alldevs, i=0; i< inum-1 ;d=d->next, i++);
+    
+    
+	/* Open the device */
+	if ( (adhandle= pcap_open(d->name,			// name of the device
+							  65536,			// portion of the packet to capture
+												// 65536 guarantees that the whole packet will be captured on all the link layers
+							  PCAP_OPENFLAG_PROMISCUOUS, 	// promiscuous mode
+							  1000,				// read timeout
+							  NULL,				// authentication on the remote machine
+							  errbuf			// error buffer
+							  ) ) == NULL)
+	{
+		fprintf(stderr,"\nUnable to open the adapter. %s is not supported by Npcap\n", d->name);
+		/* Free the device list */
+		pcap_freealldevs(alldevs);
+		return -1;
+	}
+
+	/* Open the dump file */
+	dumpfile = pcap_dump_open(adhandle, argv[1]);
+
+	if(dumpfile==NULL)
+	{
+		fprintf(stderr,"\nError opening output file\n");
+		return -1;
+	}
+    
+    printf("\nlistening on %s... Press Ctrl+C to stop...\n", d->description);
+	
+    /* At this point, we no longer need the device list. Free it */
+    pcap_freealldevs(alldevs);
+    
+    /* start the capture */
+    pcap_loop(adhandle, 0, packet_handler, (unsigned char *)dumpfile);
+
+    return 0;
+}
+
+/* Callback function invoked by libpcap for every incoming packet */
+void packet_handler(u_char *dumpfile, const struct pcap_pkthdr *header, const u_char *pkt_data)
+{
+	/* save the packet on the dump file */
+	pcap_dump(dumpfile, header, pkt_data);
+}