#include <stdio.h> #include <pcap.h> #include <windows.h> u_char * str2hex(char * str); pcap_if_t *ifselector(int inum); void showhelp(); struct ETH_HDR{ u_char dst[6]; u_char src[6]; u_short type; }; struct ARP_HDR { u_short hard; u_short proto; u_char hard_len; u_char proto_len; u_short opcode; u_char hard_addr_src[6]; u_int proto_addr_src; u_char hard_addr_dst[6]; u_int proto_addr_dst; }; char errbuf[PCAP_ERRBUF_SIZE]; pcap_if_t *alldevs; u_char buff[7]=""; int main(int argc, char *argv[]) { struct ETH_HDR eth; struct ARP_HDR arp; if(argc==1) { showhelp(); return 0; } if (argv[1][0]=='l') { ifselector(0); return 0; } if(atoi(argv[1])<=0 || atoi(argv[1])>255 || inet_addr(argv[2])==INADDR_NONE || strlen(argv[3])!=17 || inet_addr(argv[4])==INADDR_NONE || strlen(argv[5])!=17 || atoi(argv[6])<0 || (u_short)atoi(argv[6])>4096 || atoi(argv[7])<0 || (u_int)atoi(argv[7])>65535) { showhelp(); return -1; } pcap_t *adhandle=NULL; if((adhandle= pcap_open(ifselector(atoi(argv[1]))->name, 65536, PCAP_OPENFLAG_PROMISCUOUS, 1000, NULL, errbuf )) == NULL) { fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n", ifselector(atoi(argv[1]))->name); pcap_freealldevs(alldevs); return -1; } memset(ð,0,sizeof(ETH_HDR)); eth.type=htons(0x0806); //Type code Arp memcpy(ð.dst,str2hex(argv[3]),6); memcpy(ð.src,str2hex(argv[5]),6); memset(&arp,0,sizeof(ARP_HDR)); arp.hard=htons(1); arp.proto=htons(0x800); arp.hard_len=6; arp.proto_len=4; arp.opcode=htons(atoi(argv[6])); memcpy(&arp.hard_addr_dst,str2hex(argv[3]),6); memcpy(&arp.hard_addr_src,str2hex(argv[5]),6); arp.proto_addr_src=inet_addr(argv[4]); arp.proto_addr_dst=inet_addr(argv[2]); u_char packet[sizeof(ETH_HDR)+sizeof(ARP_HDR)]; memset(packet,0,sizeof(packet)); memcpy(packet,ð,sizeof(ETH_HDR)); memcpy(packet+sizeof(ETH_HDR),&arp,sizeof(ARP_HDR)); for (int i=0;i<atoi(argv[7]);i++) { printf("packet: %d sent\n",i); if (pcap_sendpacket(adhandle,packet, sizeof(packet)) != 0) { fprintf(stderr,"\nError sending the packet: \n", pcap_geterr(adhandle)); return -1; } } pcap_freealldevs(alldevs); return 0; } u_char * str2hex(char * str) { for (int i=0;i<17;i+=3) { char * ptr=str+i+1; //put1 de strtol buff[i/3]=(u_char)strtol(str+i,&ptr,16); } return (u_char *)buff; } void showhelp() { printf("Arp packet injector by Ivanlef0u\n"); printf("Usage is: arp_inj <interface number> <dst_ip> <dst_mac> <src_ip> <src_mac> <opcode> <number of packets>\n"); printf("Use arp_inj l to list interfaces\n"); printf("Exemple:arp_inj 3 192.168.0.255 ff:ff:ff:ff:ff 192.168.0.1 aa:bb:cc:dd:ee:ff 2 10 \n"); } pcap_if_t * ifselector(int inum) { pcap_if_t *d=NULL; int i=0; if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1) { fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf); exit(-1); } for(d=alldevs; d; d=d->next) { i++; if(inum ==0) { 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 WinPcap is installed.\n"); exit(-1); } if(inum>=1 && inum<=i) { for(d=alldevs, i=0; i< inum-1;d=d->next, i++); return d; } return NULL; }