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implement if_indextoname and if_nametoindex functions

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This commit is contained in:
Rich Felker 2011-04-05 13:20:08 -04:00
parent ef8b4b1aa6
commit 92b2eb8d03
2 changed files with 36 additions and 0 deletions
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18
src/network/if_indextoname.c Normal file
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#define _GNU_SOURCE
#include <net/if.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <string.h>
#include "syscall.h"
char *if_indextoname(unsigned index, char *name)
{
struct ifreq ifr;
int fd, r;
if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) return 0;
ifr.ifr_ifindex = index;
r = ioctl(fd, SIOCGIFNAME, &ifr);
__syscall(SYS_close, fd);
return r < 0 ? 0 : strncpy(name, ifr.ifr_name, IF_NAMESIZE);
}

18
src/network/if_nametoindex.c Normal file
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#define _GNU_SOURCE
#include <net/if.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <string.h>
#include "syscall.h"
unsigned if_nametoindex(const char *name)
{
struct ifreq ifr;
int fd, r;
if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) return -1;
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
r = ioctl(fd, SIOCGIFINDEX, &ifr);
__syscall(SYS_close, fd);
return r < 0 ? r : ifr.ifr_ifindex;
}