diff options
Diffstat (limited to 'networking/udhcp/socket.c')
| -rw-r--r-- | networking/udhcp/socket.c | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/networking/udhcp/socket.c b/networking/udhcp/socket.c index ea29131..c19131d 100644 --- a/networking/udhcp/socket.c +++ b/networking/udhcp/socket.c @@ -63,23 +63,27 @@ int read_interface(char *interface, int *ifindex, uint32_t *addr, uint8_t *arp) DEBUG("%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr)); } - if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) { - bb_perror_msg("SIOCGIFINDEX failed"); - close(fd); - return -1; + if (ifindex) { + if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) { + bb_perror_msg("SIOCGIFINDEX failed"); + close(fd); + return -1; + } + DEBUG("adapter index %d", ifr.ifr_ifindex); + *ifindex = ifr.ifr_ifindex; } - DEBUG("adapter index %d", ifr.ifr_ifindex); - *ifindex = ifr.ifr_ifindex; - if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0) { - bb_perror_msg("SIOCGIFHWADDR failed"); - close(fd); - return -1; + if (arp) { + if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0) { + bb_perror_msg("SIOCGIFHWADDR failed"); + close(fd); + return -1; + } + memcpy(arp, ifr.ifr_hwaddr.sa_data, 6); + DEBUG("adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x", + arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]); } - memcpy(arp, ifr.ifr_hwaddr.sa_data, 6); - DEBUG("adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x", - arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]); return 0; } |