59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
#include <u.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netpacket/packet.h>
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#include <net/ethernet.h>
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#include <netinet/in.h>
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#include <sys/ioctl.h>
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#include <libc.h>
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#include <ip.h>
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#include <bio.h>
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#include <fcall.h>
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#include <libsec.h>
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#include "dat.h"
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#include "protos.h"
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#include "y.tab.h"
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int
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opendevice(char *dev, int promisc)
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{
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int fd;
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struct ifreq ifr;
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struct sockaddr_ll sa;
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if((fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0)
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return -1;
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if(dev){
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memset(&ifr, 0, sizeof ifr);
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strncpy(ifr.ifr_name, dev, sizeof ifr.ifr_name);
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if(ioctl(fd, SIOCGIFINDEX, &ifr) < 0){
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close(fd);
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return -1;
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}
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memset(&sa, 0, sizeof sa);
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sa.sll_family = AF_PACKET;
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sa.sll_protocol = htons(ETH_P_ALL);
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sa.sll_ifindex = ifr.ifr_ifindex;
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if(bind(fd, (struct sockaddr*)&sa, sizeof sa) < 0){
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close(fd);
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return -1;
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}
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}
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if(promisc){
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memset(&ifr, 0, sizeof ifr);
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strncpy(ifr.ifr_name, dev, sizeof ifr.ifr_name);
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if(ioctl(fd, SIOCGIFFLAGS, &ifr) < 0){
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close(fd);
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return -1;
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}
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ifr.ifr_flags |= IFF_PROMISC;
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if(ioctl(fd, SIOCSIFFLAGS, &ifr) < 0){
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close(fd);
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return -1;
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}
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}
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return fd;
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}
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