tLinux.c - plan9port - [fork] Plan 9 from user space
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       ---
       tLinux.c (1157B)
       ---
            1 #include <u.h>
            2 #include <sys/socket.h>
            3 #include <net/if.h>
            4 #include <netpacket/packet.h>
            5 #include <net/ethernet.h>
            6 #include <netinet/in.h>
            7 #include <sys/ioctl.h>
            8 #include <libc.h>
            9 #include <ip.h>
           10 #include <bio.h>
           11 #include <fcall.h>
           12 #include <libsec.h>
           13 #include "dat.h"
           14 #include "protos.h"
           15 #include "y.tab.h"
           16 
           17 int
           18 opendevice(char *dev, int promisc)
           19 {
           20         int fd;
           21         struct ifreq ifr;
           22         struct sockaddr_ll sa;
           23 
           24         if((fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0)
           25                 return -1;
           26 
           27         if(dev){
           28                 memset(&ifr, 0, sizeof ifr);
           29                 strncpy(ifr.ifr_name, dev, sizeof ifr.ifr_name);
           30                 if(ioctl(fd, SIOCGIFINDEX, &ifr) < 0){
           31                         close(fd);
           32                         return -1;
           33                 }
           34                 memset(&sa, 0, sizeof sa);
           35                 sa.sll_family = AF_PACKET;
           36                 sa.sll_protocol = htons(ETH_P_ALL);
           37                 sa.sll_ifindex = ifr.ifr_ifindex;
           38                 if(bind(fd, (struct sockaddr*)&sa, sizeof sa) < 0){
           39                         close(fd);
           40                         return -1;
           41                 }
           42         }
           43 
           44         if(promisc){
           45                 memset(&ifr, 0, sizeof ifr);
           46                 strncpy(ifr.ifr_name, dev, sizeof ifr.ifr_name);
           47                 if(ioctl(fd, SIOCGIFFLAGS, &ifr) < 0){
           48                         close(fd);
           49                         return -1;
           50                 }
           51                 ifr.ifr_flags |= IFF_PROMISC;
           52                 if(ioctl(fd, SIOCSIFFLAGS, &ifr) < 0){
           53                         close(fd);
           54                         return -1;
           55                 }
           56         }
           57         return fd;
           58 }