diff options
Diffstat (limited to 'usr/iscsi_net_util.c')
| -rw-r--r-- | usr/iscsi_net_util.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/usr/iscsi_net_util.c b/usr/iscsi_net_util.c new file mode 100644 index 0000000..e52be82 --- /dev/null +++ b/usr/iscsi_net_util.c @@ -0,0 +1,100 @@ +/* + * net helpers + * + * Copyright (C) 2010 Mike Christie + * Copyright (C) 2010 Red Hat, Inc. All rights reserved. + * + * 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. + */ +#include <stdio.h> +#include <string.h> +#include <errno.h> +#include <net/if.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/ioctl.h> + +#include "sysdeps.h" +#include "ethtool-copy.h" +#include "iscsi_net_util.h" +#include "log.h" + +/** + * net_get_dev_from_hwaddress - given a hwaddress return the ethX + * @hwaddress: hw address no larger than ISCSI_HWADDRESS_BUF_SIZE + * @netdev: buffer of IFNAMSIZ size that will hold the ethX + * + * Does not support interfaces like a bond or alias because + * multiple interfaces will have the same hwaddress. + */ +int net_get_dev_from_hwaddress(char *hwaddress, char *netdev) +{ + struct if_nameindex *ifni; + struct ifreq if_hwaddr; + int found = 0, sockfd, i = 0; + unsigned char *hwaddr; + char tmp_hwaddress[ISCSI_HWADDRESS_BUF_SIZE]; + + ifni = if_nameindex(); + if (ifni == NULL) { + log_error("Could not match hwaddress %s to netdev. " + "getifaddrs failed %d", hwaddress, errno); + return errno; + } + + /* Open a basic socket. */ + sockfd = socket(AF_INET, SOCK_DGRAM, 0); + if (sockfd < 0) { + log_error("Could not open socket for ioctl."); + goto free_ifni; + } + + for (i = 0; ifni[i].if_index && ifni[i].if_name; i++) { + struct if_nameindex *n = &ifni[i]; + + strlcpy(if_hwaddr.ifr_name, n->if_name, IFNAMSIZ); + if (ioctl(sockfd, SIOCGIFHWADDR, &if_hwaddr) < 0) { + log_error("Could not match %s to netdevice.", + hwaddress); + continue; + } + + /* check for ARPHRD_ETHER (ethernet) */ + if (if_hwaddr.ifr_hwaddr.sa_family != 1) + continue; + hwaddr = (unsigned char *)if_hwaddr.ifr_hwaddr.sa_data; + + memset(tmp_hwaddress, 0, ISCSI_HWADDRESS_BUF_SIZE); + /* TODO should look and covert so we do not need tmp buf */ + sprintf(tmp_hwaddress, "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x", + hwaddr[0], hwaddr[1], hwaddr[2], hwaddr[3], + hwaddr[4], hwaddr[5]); + log_debug(4, "Found hardware address %s", tmp_hwaddress); + if (!strcasecmp(tmp_hwaddress, hwaddress)) { + log_debug(4, "Matches %s to %s", hwaddress, + n->if_name); + memset(netdev, 0, IFNAMSIZ); + strlcpy(netdev, n->if_name, IFNAMSIZ); + found = 1; + break; + } + } + + close(sockfd); +free_ifni: + if_freenameindex(ifni); + if (!found) + return ENODEV; + return 0; +} + + |