The sysfs code in batman-adv was changed to print a deprecated warning when
sysfs files are accessed. The `batctl if` call would therefore cause
warnings like this in the kernel log:
batman_adv: [Deprecated]: batctl (pid 18540) Use of sysfs file "iface_status".
Use batadv genl family instead
It is now appropriate to try the generic netlink BATADV_CMD_GET_HARDIF
request first to get the status of the interface before falling back to
sysfs.
Reported-by: Linus Lüssing <linus.luess...@c0d3.blue>
Signed-off-by: Sven Eckelmann <s...@narfation.org>
---
interface.c | 29 ++++++++++++++++++-----------
1 file changed, 18 insertions(+), 11 deletions(-)
diff --git a/interface.c b/interface.c
index 5ff25a7..0a694c9 100644
--- a/interface.c
+++ b/interface.c
@@ -67,18 +67,18 @@ static int get_iface_status_netlink_parse(struct nl_msg
*msg, void *arg)
static char *get_iface_status_netlink(unsigned int meshif, unsigned int hardif,
char *iface_status)
{
+ char *ret_status = NULL;
struct nl_sock *sock;
struct nl_msg *msg;
int batadv_family;
struct nl_cb *cb;
int ret;
- strncpy(iface_status, "<error reading status>\n", IFACE_STATUS_LEN);
- iface_status[IFACE_STATUS_LEN - 1] = '\0';
+ iface_status[0] = '\0';
sock = nl_socket_alloc();
if (!sock)
- return iface_status;
+ return NULL;
ret = genl_connect(sock);
if (ret < 0)
@@ -111,6 +111,9 @@ static char *get_iface_status_netlink(unsigned int meshif,
unsigned int hardif,
nl_recvmsgs(sock, cb);
+ if (strlen(iface_status) > 0)
+ ret_status = iface_status;
+
err_free_msg:
nlmsg_free(msg);
err_free_cb:
@@ -118,7 +121,7 @@ static char *get_iface_status_netlink(unsigned int meshif,
unsigned int hardif,
err_free_sock:
nl_socket_free(sock);
- return iface_status;
+ return ret_status;
}
static struct nla_policy link_policy[IFLA_MAX + 1] = {
@@ -161,13 +164,17 @@ static int print_interfaces_rtnl_parse(struct nl_msg
*msg, void *arg)
if (master != print_arg->ifindex)
goto err;
- snprintf(path_buff, sizeof(path_buff), SYS_IFACE_STATUS_FMT, ifname);
- ret = read_file("", path_buff, USE_READ_BUFF | SILENCE_ERRORS, 0, 0, 0);
- if (ret != EXIT_SUCCESS)
- status = get_iface_status_netlink(master, ifm->ifi_index,
- iface_status);
- else
- status = line_ptr;
+ status = get_iface_status_netlink(master, ifm->ifi_index, iface_status);
+ if (!status) {
+ snprintf(path_buff, sizeof(path_buff), SYS_IFACE_STATUS_FMT,
+ ifname);
+ ret = read_file("", path_buff, USE_READ_BUFF | SILENCE_ERRORS,
+ 0, 0, 0);
+ if (ret != EXIT_SUCCESS)
+ status = "<error reading status>\n";
+ else
+ status = line_ptr;
+ }
printf("%s: %s", ifname, status);
--
2.20.1
