diff options
Diffstat (limited to 'test/packetdrill/link_layer.c')
-rw-r--r-- | test/packetdrill/link_layer.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/test/packetdrill/link_layer.c b/test/packetdrill/link_layer.c new file mode 100644 index 0000000..d6e85a4 --- /dev/null +++ b/test/packetdrill/link_layer.c @@ -0,0 +1,104 @@ +/* + * Copyright 2013 Google Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ +/* + * Author: ncardwell@google.com (Neal Cardwell) + * + * Link-layer utilities. + */ + +#include "link_layer.h" + +#include <stdlib.h> +#include <unistd.h> + +#include "logging.h" + +#ifdef linux + +#include <net/if.h> +#include <sys/ioctl.h> + +#include "wrap.h" + +void get_hw_address(const char *name, struct ether_addr *hw_address, + enum ip_version_t ip_version) +{ + u8 *m = NULL; + struct ifreq ifr; + int fd; + + DEBUGP("get_hw_address for device %s\n", name); + + fd = wrap_socket(ip_version, SOCK_DGRAM); + + /* Discover the index of the interface. */ + snprintf(ifr.ifr_name, IFNAMSIZ, "%s", name); + if (ioctl(fd, SIOCGIFINDEX, &ifr) < 0) + die_perror("ioctl SIOCGIFINDEX"); + + /* Get hardware address for the interface. */ + if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0) + die_perror("ioctl SIOCGIFHWADDR"); + + m = (u8 *)&ifr.ifr_addr.sa_data; + DEBUGP("%s HWaddr: %02x:%02x:%02x:%02x:%02x:%02x\n", + name, m[0], m[1], m[2], m[3], m[4], m[5]); + memcpy(hw_address, m, sizeof(*hw_address)); + + if (close(fd)) + die_perror("close"); +} + +#else + +#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) +#include <net/if_types.h> +#include <net/if_dl.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <ifaddrs.h> +#endif /* defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) */ + +void get_hw_address(const char *name, struct ether_addr *hw_address) +{ + struct ifaddrs *ifaddrs_list, *ifaddr; + + DEBUGP("get_hw_address for device %s\n", name); + + if (getifaddrs(&ifaddrs_list) < 0) + die_perror("getifaddrs"); + + for (ifaddr = ifaddrs_list; ifaddr != NULL; ifaddr = ifaddr->ifa_next) { + if (strcmp(name, ifaddr->ifa_name) == 0 && + ifaddr->ifa_addr->sa_family == AF_LINK) { + struct sockaddr_dl *sdl; + sdl = (struct sockaddr_dl *)ifaddr->ifa_addr; + if (sdl->sdl_type == IFT_ETHER) { + memcpy(hw_address, LLADDR(sdl), + sizeof(*hw_address)); + freeifaddrs(ifaddrs_list); + return; + } + } + } + + die("unable to find hw address for %s\n", name); +} + +#endif |