added channelhopping feature

[my-code/hdw-sniff.git] / hdw-sniff.c

diff --git a/hdw-sniff.c b/hdw-sniff.c
index ab67722..8cbfb49 100644 (file)
--- 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 +75,30 @@ 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 hop_channel(&my_info_struct,pcap_fd);
+       }
        return 0;
 }
 
@@ -166,4 +189,21 @@ 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;
+
+       if (info->channel==15) info->channel=1;
+
+       memset(&my_iwreq,0,sizeof(my_iwreq));
+       strcpy(my_iwreq.ifr_name,info->dev);
+       my_iwreq.u.freq.e=0;
+       my_iwreq.u.freq.m=info->channel;
+       if((ioctl(pcap_fd,SIOCSIWFREQ,& my_iwreq))==-1) {
+               printf("unable to hop channels\n");
+               return -1;
+       }
+       printf("debug: hopped to channel %d\n",info->channel);
+       ++(info->channel);
+       return 0;
+}
+