X-Git-Url: https://hackdaworld.org/gitweb/?p=my-code%2Fhdw-sniff.git;a=blobdiff_plain;f=hdw-sniff.c;h=db285a2e75b7c53c3b40138088eef7a00b95efde;hp=d3b2ca8965f800f78389755ce3fb395865356dcb;hb=f0775823587944872372259c853aee47601c82e8;hpb=d161945cf9722f66bd5690f58fc0a95fc348e532

diff --git a/hdw-sniff.c b/hdw-sniff.c
index d3b2ca8..db285a2 100644
--- a/hdw-sniff.c
+++ b/hdw-sniff.c
@@ -12,6 +12,9 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <pcap.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
 
 /* IEEE 802.3 stuff -- i will concentrate on .11 stuff before! */
 #include <netinet/if_ether.h>  /* for ethhdr struct */
@@ -28,6 +31,9 @@ int main(int argc, char *argv[]) {
 
 	char pcap_error[PCAP_ERRBUF_SIZE];
 	pcap_t *pcap_handle;
+	int pcap_fd;
+	fd_set pcap_fd_set;
+	struct timeval fd_set_tv;
 	char sys_call[30];
 	FILE *logfile;
 	struct info_struct my_info_struct;
@@ -69,13 +75,33 @@ int main(int argc, char *argv[]) {
 		printf("%s: %s\n",argv[0],pcap_error);
 		return 1;
 	}
+
+	/* set non blocking */
+	if((pcap_setnonblock(pcap_handle,1,pcap_error))==-1) {
+		printf("%s: %s\n",argv[0],pcap_error);
+		return 1;
+	}
 	
 	/* grab a package until user breaks */
 	my_info_struct.count=0;
 	my_info_struct.mmode=argv[2][0];
 	strcpy(my_info_struct.dev,argv[1]);
+
+	/* prepare for select */
+	pcap_fd=pcap_fileno(pcap_handle);
+	FD_ZERO(&pcap_fd_set);
+	FD_SET(pcap_fd,&pcap_fd_set);
+	fd_set_tv.tv_sec=0;
+	fd_set_tv.tv_usec=500000;
+
 	/* do loopp */
-	pcap_loop(pcap_handle,-1,pcap_process,(u_char *)&my_info_struct);
+	while(1) {
+		if((select(pcap_fd+1,&pcap_fd_set,NULL,NULL,&fd_set_tv)) && (FD_ISSET(pcap_fd,&pcap_fd_set))) pcap_loop(pcap_handle,-1,pcap_process,(u_char *)&my_info_struct);
+		else if((hop_channel(&my_info_struct,pcap_fd))==-1) { 
+			printf("channelhopping failed, aborting\n");
+			return -1;
+		}
+	}
 	return 0;
 }
 
@@ -85,9 +111,10 @@ void pcap_process(u_char *info,const struct pcap_pkthdr *pcap_header,
 			const u_char *package) {
 	
 	/* local variables */
-	struct ethhdr *e_hdr;
-	struct ip *ip_hdr;
+	struct linux_wlan_ng_prism_hdr *prism_hdr;
 	struct ieee802_11_hdr *w_hdr;
+	struct ip *ip_hdr;
+	struct ethhdr *e_hdr;
 	struct info_struct *my_info_struct;
 	int i;
 
@@ -97,16 +124,38 @@ void pcap_process(u_char *info,const struct pcap_pkthdr *pcap_header,
 	printf("\n");
 	printf("---> package %d ---- %s",my_info_struct->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("pcap header:\n");
+	printf("capture_length: %d (dec.)\t",pcap_header->caplen);
+	printf("length(off wire): %d (dec.)\n",pcap_header->len);
 	
-	/* is ieee802.11 ? -- we assume yes :) */
+	/* prism wlan ng headers */
 	if((my_info_struct->mmode-0x30==1) && 
 		(strncmp(my_info_struct->dev,"wlan",4)==0)) {
-	printf("debug: ieee802.11\n");
-	}
+	printf("prism header:\n");
+	prism_hdr=(struct linux_wlan_ng_prism_hdr *)package;
+	printf("message code/length: %d/%d\n",ntohs(prism_hdr->msgcode),
+						ntohs(prism_hdr->msglen));
+	printf("device: %s\n",prism_hdr->devname);
 
+	/* ieee802.11 header */
+	printf("ieee802.11 header:\n");
+	package+=sizeof(struct linux_wlan_ng_prism_hdr);
+	w_hdr=(struct ieee802_11_hdr *)package;
+	
+	printf("debug:\n");
+	for(i=0;i<16;i++) {
+		printf("%x -> ",1<<i);
+		printf("%x\n",(ntohs(w_hdr->frame_ctl) & (1<<i)));
+	}
+	printf("frame_control: %x duration_id: %x\n",ntohs(w_hdr->frame_ctl),
+						ntohs(w_hdr->duration_id));
+	printf("version check ... %s\n",
+	((ntohs(w_hdr->frame_ctl) & IEEE802_11_FCTL_VERS)==0x00)?
+							"ok":"unknown");
+	// printf("type: 
+	/* skip ieee802.11 header */
+	package=package+sizeof(struct ieee802_11_hdr);
+	}
 
 	/* ieee802.3 */
 	/* ethernet */
@@ -143,4 +192,30 @@ void pcap_process(u_char *info,const struct pcap_pkthdr *pcap_header,
 	printf("\n");
 }
 
-		
+int hop_channel(struct info_struct *info,int pcap_fd) {
+	struct iwreq my_iwreq;
+	int foo_fd;
+	/* oder vielleicht doch pcap_fd ? */
+	if((foo_fd=socket(AF_INET,SOCK_DGRAM,0))==-1) {
+		printf("unable to create socket\n");
+		return -1;
+	}
+
+	if (info->channel==15) info->channel=1;
+
+	memset(&my_iwreq,0,sizeof(my_iwreq));
+	strcpy(my_iwreq.ifr_name,info->dev);
+	printf("debug: device = %s\n",my_iwreq.ifr_name);
+	my_iwreq.u.freq.e=0;
+	my_iwreq.u.freq.m=info->channel;
+	// if((ioctl(foo_fd,SIOCSIWFREQ,&my_iwreq))==-1) {
+	if((ioctl(pcap_fd,SIOCSIWFREQ,&my_iwreq))==-1) {
+		printf("unable to hop channels\n");
+		perror("ioctl");
+		return -1;
+	}
+	printf("debug: hopped to channel %d\n",info->channel);
+	++(info->channel);
+	return 0;
+}
+