X-Git-Url: https://hackdaworld.org/gitweb/?p=my-code%2Fhdw-sniff.git;a=blobdiff_plain;f=hdw-sniff.c;h=db285a2e75b7c53c3b40138088eef7a00b95efde;hp=d6f2b0c087b9bfb99a3882e3e5b91c45837b6ada;hb=f0775823587944872372259c853aee47601c82e8;hpb=6b943da1deb33efbbdcd649d92c6a369c317cfd5 diff --git a/hdw-sniff.c b/hdw-sniff.c index d6f2b0c..db285a2 100644 --- a/hdw-sniff.c +++ b/hdw-sniff.c @@ -5,12 +5,21 @@ */ #include +#include +#include +#include +#include +#include +#include #include +#include +#include +#include /* IEEE 802.3 stuff -- i will concentrate on .11 stuff before! */ -#include +#include /* for ethhdr struct */ #include /* ip */ -#include /* in_addr */ +#include /* in_addr , inet_ntoa */ /* IEEE 802.11 stuff -- will become one include later ... */ #include "ieee80211.h" /* from hunz's aeolus, short hostap_wlan.h */ @@ -18,51 +27,135 @@ #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; + 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; /* parse the arguments */ - if(argc<2) { - printf("usage: %s \n",argv[0]); + if(argc<3) { + printf("usage: %s \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) { + printf("setting to monitor mode\n"); + if(strncmp(argv[1],"wlan",4)==0) + sprintf(sys_call,"iwpriv %s monitor 3",argv[1]); + if(strncmp(argv[1],"eth",3)==0) + sprintf(sys_call,"ifconfig %s promisc",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) { 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 */ - count=0; - while (count 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); + 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 */ + 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; +} + + +/* pcap_process callback function */ +void pcap_process(u_char *info,const struct pcap_pkthdr *pcap_header, + const u_char *package) { - /* is ieee802.11 ? -- we assume yes :) */ - /* ... */ + /* local variables */ + 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; + + my_info_struct=(struct info_struct *)info; + ++(my_info_struct->count); + printf("\n"); + printf("---> package %d ---- %s",my_info_struct->count, + ctime((const time_t*)&(pcap_header->ts.tv_sec))); + printf("pcap header:\n"); + printf("capture_length: %d (dec.)\t",pcap_header->caplen); + printf("length(off wire): %d (dec.)\n",pcap_header->len); + + /* prism wlan ng headers */ + if((my_info_struct->mmode-0x30==1) && + (strncmp(my_info_struct->dev,"wlan",4)==0)) { + 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<frame_ctl) & (1<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 */ @@ -82,22 +175,47 @@ int main(int argc, char *argv[]) { ip_hdr=(struct ip *)(package+sizeof(struct ethhdr)); printf("version = %x ",ntohs(ip_hdr->ip_v)); printf("header_length = %x \n",ntohs(ip_hdr->ip_hl)); - // i=0; - //printf("service = %x ",*(ip_hdr->ip_tos)); - //printf("total_length(dec.) = %hu \n",*(ip_hdr->ip_len)); - //printf("ip_addresses: source = "); - //for(i=0;i<4;i++) - // printf("%x%s",ntohl(ip_hdr->ip_src), - // (i==3?"\n":".")); - - + printf("service = %x ",ntohs(ip_hdr->ip_tos)); + printf("total_length(dec.) = %d \n",ntohs(ip_hdr->ip_len)); + 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("rest:\n"); - for(i=sizeof(struct ethhdr);icaplen;i++) printf("%x ",*(package+i)); 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; } - printf("\n"); - printf("wake up early! :)\n"); - printf("\n"); + + 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; } +