| nasim751 |
04-20-2008 02:52 AM |
Cannot get interface flags: Invalid argument
hello,
i am trying to setup network device but unfortunately can't get interface.
i got few feedback from like you people even though the problem is in right place. How can i get this result.Please give me your feedback.
This is the function..........
error : Cannot get interface flags: Invalid argument
Code:
Description: Set up the network device so we can read it.
initdevice(int fd_flags, u_long dflags)
{
struct ifreq ifr;
int fd, flags = 0;
if((fd = socket(PF_INET, SOCK_PACKET, htons(0x0003))) < 0)
{
perror("Cannot open device socket");
exit(-1);
}
/* Get the existing interface flags */
strcpy(ifr.ifr_name, Gdevice);
if(ioctl(fd, SIOCGIFFLAGS, &ifr) < 0)
{
perror("Cannot get interface flags");
exit(-1);
}
ifr.ifr_flags |= IFF_PROMISC;
if(ioctl(fd, SIOCSIFFLAGS, &ifr) < 0)
{
perror("Cannot set interface flags");
exit(-1);
}
return(fd);
}
Main body..............
Code:
int SIOCGIFFLAGS;
int SIOCSIFFLAGS;
extern int errno;
extern char *optarg;
extern int optind, opterr;
void do_tcp(), do_udp(), do_icmp(), print_info(), process_packet();
void addtcp(), addudp(), clear_pktin(), buildnet();
void doargs(), usage(), addfloodinfo(), rmfloodinfo();
struct scaninfo *doicare(), *addtarget();
char *anetaddr(), *ether_ntoa();
u_char *readdevice();
main(argc, argv)
int argc;
char *argv[];
{
int pktlen = 0, i, netfd;
u_char *pkt;
char hostname[32];
struct hostent *hp;
time_t t;
doargs(argc, argv);
openlog("WATCHER", 0, LOG_DAEMON);
if(gethostname(hostname, sizeof(hostname)) < 0)
{
perror("gethostname");
exit(-1);
}
if((hp = gethostbyname(hostname)) == NULL)
{
fprintf(stderr, "Cannot find own address\n");
exit(-1);
}
memcpy((char *)&Gmaddr, hp->h_addr, hp->h_length);
buildnet();
if((netfd = initdevice(O_RDWR, 0)) < 0)
exit(-1);
/* Now read packets forever and process them. */
t = time((time_t *)0);
while(pkt = readdevice(netfd, &pktlen))
{
process_packet(pkt, pktlen);
if(time((time_t *)0) - t > Gtimer)
{
/* Times up. Print what we found and clean out old stuff. */
for(Gsi = Gsilist, i = 0; Gsi; Gsi = Gsi->next, i++)
{
clear_pktin(Gsi);
print_info();
Gsi->icmpcnt = 0;
}
t = time((time_t *)0);
}
}
}
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