[PATCH] alfred: add more verbose error message - B.A.T.M.A.N - lists.open-mesh.org

8 Sep 2024

There is an issue with some Linux distributions (Raspian) where network interfaces are up and
active, but do not have the correct link-local address. This condition is now checked and
output to stderr to better help users troubleshoot this issue.
Signed-off-by: Noah Peterson noahbpeterson1997@gmail.com
---
netsock.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/netsock.c b/netsock.c
index feed21d..04f95c7 100644
--- a/netsock.c
+++ b/netsock.c
@@ -322,7 +322,23 @@ static int netsock_open(struct globals *globals, struct interface *interface)
        enable_raw_bind_capability(0);
if (bind(sock, (struct sockaddr *)&sin6, sizeof(sin6)) < 0) {
-               perror("can't bind");
+               if (errno == EADDRNOTAVAIL)
+                       fprintf(stderr, "can't bind to interface %s; "
+                               "expected ipv6 address not found: "
+                               "%02x%02x::%02x%02x:%02x%02x:%02x%02x:%02x%02x\n",
+                               interface->interface,
+                               (int)interface->address.ipv6.s6_addr[0],
+                               (int)interface->address.ipv6.s6_addr[1],
+                               (int)interface->address.ipv6.s6_addr[8],
+                               (int)interface->address.ipv6.s6_addr[9],
+                               (int)interface->address.ipv6.s6_addr[10],
+                               (int)interface->address.ipv6.s6_addr[11],
+                               (int)interface->address.ipv6.s6_addr[12],
+                               (int)interface->address.ipv6.s6_addr[13],
+                               (int)interface->address.ipv6.s6_addr[14],
+                               (int)interface->address.ipv6.s6_addr[15]);
+               else
+                       perror("can't bind");
                goto err;
        }

    