getifaddrs, freeifaddrs – get interface addresses<\/a> Generic NETLINK HowTo<\/a> Code Snippet: getifaddrs<\/a> lldpd\/src\/daemon\/interfaces-linux.c<\/a> Manual Pages getifaddrs, freeifaddrs – get interface addresses packet – packet interface on device level NETLINK Generic NETLINK HowTo Netlink Sockets in C using the 3.X linux kernel Tutorials & Blogs Code Snippet: getifaddrs Get the IP address of the machine How to get MAC address of your machine using a C program? How to […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3804","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/3804","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3804"}],"version-history":[{"count":6,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/3804\/revisions"}],"predecessor-version":[{"id":3810,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=\/wp\/v2\/posts\/3804\/revisions\/3810"}],"wp:attachment":[{"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3804"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3804"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.bachi.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3804"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\npacket – packet interface on device level<\/a><\/p>\nNETLINK<\/h3>\n
\nNetlink Sockets in C using the 3.X linux kernel<\/a><\/p>\nTutorials & Blogs<\/h3>\n
\nGet the IP address of the machine<\/a>
\nHow to get MAC address of your machine using a C program?<\/a>
\nHow to get local IP and MAC address C [duplicate]<\/a>
\nMAC address with getifaddrs<\/a> (wrong answer!!)<\/p>\nCode Stippet<\/h3>\n
\nGet network interface\u2019s MAC address and IP address<\/a><\/p>\n\r\n#include <sys\/types.h>\r\n#include <sys\/ioctl.h>\r\n#include <sys\/socket.h>\r\n#include <sys\/un.h>\r\n#include <sys\/param.h>\r\n\r\n#include <netinet\/in.h>\r\n#include <net\/ethernet.h>\r\n#include <net\/if.h>\r\n\r\n#include <linux\/if_link.h>\r\n#include <linux\/if_vlan.h>\r\n#include <linux\/sockios.h>\r\n\r\n#include <ifaddrs.h>\r\n\r\nbool\r\nnetif_init(netif_t *netif, const char *name)\r\n{\r\n bool result = true;\r\n int sockfd;\r\n struct ifaddrs *ifas;\r\n struct ifaddrs *ifa;\r\n struct ifreq ifr;\r\n struct rtnl_link_stats *stats;\r\n struct vlan_ioctl_args ifv;\r\n \r\n \/* string copy name *\/\r\n strncpy(netif->name, name, NETIF_NAME_SIZE);\r\n \r\n \/* create socket (required for ioctl) *\/\r\n if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {\r\n LOG_ERRNO(LOG_NETWORK_INTERFACE, LOG_ERROR, errno, ("socket failed"));\r\n return false;\r\n }\r\n \r\n \/* get interface addresses *\/\r\n if (getifaddrs(&ifas) != 0) {\r\n return false;\r\n }\r\n \r\n for (ifa = ifas; ifa != NULL; ifa = ifa->ifa_next) {\r\n if ((ifa->ifa_addr) == NULL) continue;\r\n if ((ifa->ifa_flags & IFF_UP) == 0) continue;\r\n \r\n \r\n \/* network interface name matches *\/\r\n if (strcmp(name, ifa->ifa_name) == 0) {\r\n \r\n switch (ifa->ifa_addr->sa_family) {\r\n case AF_INET: netif_add_ipv4_address(netif, IPV4_ADDRESS(&(INADDR(ifa->ifa_addr)->sin_addr)),\r\n IPV4_ADDRESS(&(INADDR(ifa->ifa_netmask)->sin_addr)),\r\n IPV4_ADDRESS(&(INADDR(ifa->ifa_broadaddr)->sin_addr)),\r\n NULL);\r\n break;\r\n \r\n case AF_INET6: netif_add_ipv6_address(netif, IPV6_ADDRESS(&(INADDR6(ifa->ifa_addr)->sin6_addr)),\r\n IPV6_ADDRESS(&(INADDR6(ifa->ifa_netmask)->sin6_addr)),\r\n IPV6_STATE_VALID);\r\n break;\r\n\r\n case AF_PACKET: stats = ifa->ifa_data;\r\n LOG_PRINTLN(LOG_NETWORK_INTERFACE, LOG_DEBUG, ("tx packet: %" PRIu32 " rx packet: %" PRIu32 " tx bytes: %" PRIu32 " rx bytes: %" PRIu32,\r\n stats->tx_packets, stats->rx_packets, stats->tx_bytes, stats->rx_bytes));\r\n\r\n bzero((char *) &ifr, sizeof(ifr));\r\n strncpy(ifr.ifr_name, netif->name, NETIF_NAME_SIZE);\r\n if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) != -1) {\r\n netif_add_mac_address(netif, MAC_ADDRESS(LLADDR(LADDR(ifr.ifr_hwaddr.sa_data))));\r\n bzero((char *) &ifv, sizeof(ifv));\r\n ifv.cmd = GET_VLAN_VID_CMD;\r\n strncpy(ifv.device1, netif->name, sizeof(ifv.device1));\r\n if (ioctl(sockfd, SIOCGIFVLAN, &ifv) != -1) {\r\n netif_add_vid(netif, ifv.u.VID);\r\n }\r\n } else {\r\n LOG_PRINTLN(LOG_NETWORK_INTERFACE, LOG_ERROR, ("couldn't get MAC address"));\r\n result = false;\r\n goto netif_init_exit;\r\n }\r\n break;\r\n\r\n default: continue;\r\n }\r\n }\r\n }\r\n \r\nnetif_init_exit:\r\n freeifaddrs(ifas);\r\n\r\n return result;\r\n}\r\n<\/pre>\n\r\n$ grep -r vlan_ioctl \/usr\/include\r\n\/usr\/include\/linux\/if_vlan.h:\/* Passed in vlan_ioctl_args structure to determine behaviour. *\/\r\n\/usr\/include\/linux\/if_vlan.h:enum vlan_ioctl_cmds {\r\n\/usr\/include\/linux\/if_vlan.h:struct vlan_ioctl_args {\r\n\/usr\/include\/linux\/if_vlan.h:\tint cmd; \/* Should be one of the vlan_ioctl_cmds enum above. *\/\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"