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Tidy up nl_getifdata() a bit. Eliminate some unnecessary local variables,

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and use NLMSG_LENGTH().
This commit is contained in:
Nicholas J. Kain 2012-04-03 10:06:00 -04:00
parent a419b85e4f
commit 93b44ed48d
1 changed files with 2 additions and 6 deletions
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8
ndhc/netlink.c
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@ -141,16 +141,12 @@ int nl_getifdata(const char *ifname, struct client_state_t *cs)
{ {
char buf[8192]; char buf[8192];
struct nlmsghdr *nlh = (struct nlmsghdr *)buf; struct nlmsghdr *nlh = (struct nlmsghdr *)buf;
struct ifinfomsg *ifinfo;
size_t msgsize = NLMSG_HDRLEN + NLMSG_ALIGN(sizeof *ifinfo);
memset(buf, 0, msgsize); memset(buf, 0, sizeof buf);
nlh->nlmsg_len = msgsize; nlh->nlmsg_len = NLMSG_LENGTH(sizeof (struct ifinfomsg));
nlh->nlmsg_type = RTM_GETLINK; nlh->nlmsg_type = RTM_GETLINK;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT; nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT;
nlh->nlmsg_seq = time(NULL); nlh->nlmsg_seq = time(NULL);
ifinfo = (struct ifinfomsg *)((char *)buf + NLMSG_HDRLEN);
ifinfo->ifi_family = AF_UNSPEC;
struct sockaddr_nl addr = { struct sockaddr_nl addr = {
.nl_family = AF_NETLINK, .nl_family = AF_NETLINK,