From 0e50ececb00ef7a80203545d27edfaf4bc95d4b8 Mon Sep 17 00:00:00 2001
From: hackbard <hackbard>
Date: Tue, 10 Sep 2002 01:55:28 +0000
Subject: [PATCH] pcap_next -> pcap_loop

---
 hdw-sniff.c | 88 ++++++++++++++++++++++++++++++++++++-----------------
 hdw-sniff.h |  6 +++-
 2 files changed, 65 insertions(+), 29 deletions(-)

diff --git a/hdw-sniff.c b/hdw-sniff.c
index f6a8bc9..96ef4a2 100644
--- a/hdw-sniff.c
+++ b/hdw-sniff.c
@@ -8,7 +8,7 @@
 #include <pcap.h>
 
 /* IEEE 802.3 stuff -- i will concentrate on .11 stuff before! */
-#include <netinet/if_ether.h>
+#include <netinet/if_ether.h>  /* for ethhdr struct */
 #include <netinet/ip.h> /* ip */
 #include <netinet/in.h>	/* in_addr */
 
@@ -18,28 +18,42 @@
 
 #include "hdw-sniff.h" /* my functions */
 
-#define MAX_PACKAGES 3
-
 int main(int argc, char *argv[]) {
 
-	int i,count;
 	char pcap_error[PCAP_ERRBUF_SIZE];
 	pcap_t *pcap_handle;
-	const u_char *package;
-	struct pcap_pkthdr pcap_header;
-	struct ethhdr *e_hdr;
-	struct ip *ip_hdr;
-	struct ieee802_11_hdr *w_hdr;
+	char sys_call[30];
+	FILE *logfile;
+	int count;
+	int *p_count;
 	
 	/* parse the arguments */
-	if(argc<2) {
-		printf("usage: %s <interface> <logfile>\n",argv[0]);
+	if(argc<3) {
+		printf("usage: %s <interface> <monitor mode> <logfile>\n",argv[0]);
 		return 0;
 	}
-	if(argc!=3) {
+	if(argc!=4) {
 		printf("no logfile specified, writing to stdout ...\n");
+	} 
+	else {
+		if((logfile=fopen(argv[3],"w"))!=NULL) {
+			printf("writing to logfile %s ...\n",argv[3]);
+		}
+		else {
+			printf("can't open logfile!\n");
+		}
 	}
-	
+			
+	/* setting up device and set monitor mode */
+	if(atoi(argv[2])==1 && (strncmp(argv[1],"wlan",4)==0)) {
+		printf("setting to monitor mode 3\n");
+		sprintf(sys_call,"iwpriv %s monitor 3",argv[1]);
+		system(sys_call);
+	}
+	printf("setting up interface\n");
+	sprintf(sys_call,"ifconfig %s up",argv[1]);
+	system(sys_call);
+
 	/* start pcap session */
 	pcap_handle=pcap_open_live(argv[1],BUFSIZ,1,-1,pcap_error);
 	if(pcap_handle==NULL) {
@@ -49,16 +63,32 @@ int main(int argc, char *argv[]) {
 	
 	/* grab a package until user breaks */
 	count=0;
-	while (count<MAX_PACKAGES) {
-	count++;
+	p_count=&count;
+	pcap_dispatch(pcap_handle,-1,(pcap_handler)pcap_process,
+			(u_char *)&p_count);
+}
+
+
+/* pcap_process callback function */
+void pcap_process(u_char *count,const struct pcap_pkthdr *pcap_header,
+			const u_char *package) {
+	
+	/* local variables */
+	struct ethhdr *e_hdr;
+	struct ip *ip_hdr;
+	struct ieee802_11_hdr *w_hdr;
+	int i;
+	int *p_count;
+
+	p_count=(int *)count;
+	++(*p_count);
+
 	printf("\n");
-	if((package=pcap_next(pcap_handle,&pcap_header))!=NULL) {
-		printf("---> package %d ---- %s",count,
-				ctime((const time_t*)&pcap_header.ts.tv_sec));
-		printf("pcap header: ");
-		printf("capture length=%d ",pcap_header.caplen);
-		printf("length(off wire)=%d\n",pcap_header.len);
-	}
+	printf("---> package %d ---- %s",count,
+			ctime((const time_t*)pcap_header->ts.tv_sec));
+	printf("pcap header: ");
+	printf("capture length=%d ",pcap_header->caplen);
+	printf("length(off wire)=%d\n",pcap_header->len);
 	
 	/* is ieee802.11 ? -- we assume yes :) */
 	/* ...					*/
@@ -87,15 +117,17 @@ int main(int argc, char *argv[]) {
 		printf("ip_addresses: source = ");
 		printf("%s\tdestination = %s\n",inet_ntoa(ip_hdr->ip_src),
 						inet_ntoa(ip_hdr->ip_dst));
+		printf("ip_id = %x ",ntohs(ip_hdr->ip_id));
+		printf("ip_offset = %x \n",ntohs(ip_hdr->ip_off));
+		printf("time2live = %x ip_proto = %x\n",ntohs(ip_hdr->ip_ttl),
+						ntohs(ip_hdr->ip_p));
+		printf("chksum: %x\n",ntohs(ip_hdr->ip_sum));
 		
 		
 	}
 	printf("all_hex_dump:\n");
-	for(i=sizeof(struct ethhdr);i<pcap_header.caplen;i++)
+	for(i=sizeof(struct ethhdr);i<pcap_header->caplen;i++)
 		printf("%x ",*(package+i));
-	printf("\n");
-	}
-	printf("\n");
-	printf("wake up early! :)\n");
-	printf("\n");
 }
+
+		
diff --git a/hdw-sniff.h b/hdw-sniff.h
index 40a8c17..d7a3e89 100644
--- a/hdw-sniff.h
+++ b/hdw-sniff.h
@@ -1 +1,5 @@
-/* empty */
+/* the pcap_process callback function */
+void pcap_process(u_char *count,const struct pcap_pkthdr *pcap_header,
+			const u_char *package);
+
+
-- 
2.39.2