static struct if_nameindex *
if_nameindex_netlink (void)
{
struct netlink_handle nh = { 0, 0, 0, NULL, NULL };
struct if_nameindex *idx = NULL;
if (__no_netlink_support || __netlink_open (&nh) < 0)
return NULL;
/* Tell the kernel that we wish to get a list of all
active interfaces. Collect all data for every interface. */
if (__netlink_request (&nh, RTM_GETLINK) < 0)
goto exit_free;
/* Count the interfaces. */
unsigned int nifs = 0;
for (struct netlink_res *nlp = nh.nlm_list; nlp; nlp = nlp->next)
{
struct nlmsghdr *nlh;
size_t size = nlp->size;
if (nlp->nlh == NULL)
continue;
/* Walk through all entries we got from the kernel and look, which
message type they contain. */
for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size))
{
/* Check if the message is what we want. */
if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq)
continue;
if (nlh->nlmsg_type == NLMSG_DONE)
break; /* ok */
if (nlh->nlmsg_type == RTM_NEWLINK)
++nifs;
}
}
idx = malloc ((nifs + 1) * sizeof (struct if_nameindex));
if (idx == NULL)
{
nomem:
__set_errno (ENOBUFS);
goto exit_free;
}
/* Add the interfaces. */
nifs = 0;
for (struct netlink_res *nlp = nh.nlm_list; nlp; nlp = nlp->next)
{
struct nlmsghdr *nlh;
size_t size = nlp->size;
if (nlp->nlh == NULL)
continue;
/* Walk through all entries we got from the kernel and look, which
message type they contain. */
for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size))
{
/* Check if the message is what we want. */
if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq)
continue;
if (nlh->nlmsg_type == NLMSG_DONE)
break; /* ok */
if (nlh->nlmsg_type == RTM_NEWLINK)
{
struct ifinfomsg *ifim = (struct ifinfomsg *) NLMSG_DATA (nlh);
struct rtattr *rta = IFLA_RTA (ifim);
size_t rtasize = IFLA_PAYLOAD (nlh);
idx[nifs].if_index = ifim->ifi_index;
while (RTA_OK (rta, rtasize))
{
char *rta_data = RTA_DATA (rta);
size_t rta_payload = RTA_PAYLOAD (rta);
if (rta->rta_type == IFLA_IFNAME)
{
idx[nifs].if_name = __strndup (rta_data, rta_payload);
if (idx[nifs].if_name == NULL)
{
idx[nifs].if_index = 0;
if_freenameindex (idx);
idx = NULL;
goto nomem;
}
break;
}
rta = RTA_NEXT (rta, rtasize);
}
++nifs;
}
}
}
idx[nifs].if_index = 0;
idx[nifs].if_name = NULL;
exit_free:
__netlink_free_handle (&nh);
__netlink_close (&nh);
return idx;
}
/* Replace any occurrences of the string STR in ARGZ with WITH, reallocating
ARGZ as necessary. If REPLACE_COUNT is non-zero, *REPLACE_COUNT will be
incremented by number of replacements performed. */
error_t
__argz_replace (char **argz, size_t *argz_len, const char *str, const char *with,
unsigned *replace_count)
{
error_t err = 0;
if (str && *str)
{
char *arg = 0;
char *src = *argz;
size_t src_len = *argz_len;
char *dst = 0;
size_t dst_len = 0;
int delayed_copy = 1; /* True while we've avoided copying anything. */
size_t str_len = strlen (str), with_len = strlen (with);
while (!err && (arg = argz_next (src, src_len, arg)))
{
char *match = strstr (arg, str);
if (match)
{
char *from = match + str_len;
size_t to_len = match - arg;
char *to = __strndup (arg, to_len);
while (to && from)
{
str_append (&to, &to_len, with, with_len);
if (to)
{
match = strstr (from, str);
if (match)
{
str_append (&to, &to_len, from, match - from);
from = match + str_len;
}
else
{
str_append (&to, &to_len, from, strlen (from));
from = 0;
}
}
}
if (to)
{
if (delayed_copy)
/* We avoided copying SRC to DST until we found a match;
now that we've done so, copy everything from the start
of SRC. */
{
if (arg > src)
err = __argz_append (&dst, &dst_len, src, (arg - src));
delayed_copy = 0;
}
if (! err)
err = __argz_add (&dst, &dst_len, to);
free (to);
}
else
err = ENOMEM;
if (replace_count)
(*replace_count)++;
}
else if (! delayed_copy)
err = __argz_add (&dst, &dst_len, arg);
}
if (! err)
{
if (! delayed_copy)
/* We never found any instances of str. */
{
free (src);
*argz = dst;
*argz_len = dst_len;
}
}
else if (dst_len > 0)
free (dst);
}
return err;
}
