alfred: add more verbose error message
Commit Message
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(-)
Comments
On Sunday, 8 September 2024 22:46:05 CEST noahbpeterson1997@gmail.com wrote:
> 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;
> }
Ehrm, no - this is not a valid way to print IPv6 addresses and it makes to
many assumptions about the IPv6 address - which will then lead to more
problems in the future. For creating the ip address string:
char ipstr_buf[INET6_ADDRSTRLEN];
const char *ipstr;
....
ipstr = inet_ntop(AF_INET6, &interface->address.ipv6.s6_addr,
ipstr_buf, INET6_ADDRSTRLEN);
Kind regards,
Sven
@@ -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;
}