virtionet: Fix 'path too long' issues with virtio-net unixgram Support #195
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With unixgram sockets, we need to specify a client endpoint, which is a path on the filesystem with a maximum length of 104 bytes on macOS. When using -device virtio-net,unixSocketPath=/tmp/vnet.sock, we need to create a client endpoint before connecting to /tmp/vnet.sock. It's currently put into `/Users/user/Library/Application Support`, which is already fairly long. Depending on the username, the 104 bytes are easily exceeded, this has been causing problems to podman machine. This commit will create the client endpoint in the same directory as the server endpoint, which gives more control to the user of vfkit wrt where this socket is going. This fixes crc-org#194 Signed-off-by: Christophe Fergeau <cfergeau@redhat.com>
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baude
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Sep 21, 2024
pkg/vf/virtionet.go
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| if err != nil { | ||
| return err | ||
| } | ||
| // FIXME: need to remove localSocketPath at process exit | ||
| if len(localSocketPath) >= 104 { | ||
| return fmt.Errorf("socket path is too long: %d", len(localSocketPath)) |
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maybe add the max value here ?
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I've changed it to
+ if len(localSocketPath) >= maxUnixgramPathLen {
+ return fmt.Errorf("unixgram path '%s' is too long: %d >= %d bytes", localSocketPath, len(localSocketPath), maxUnixgramPathLen)
+ }
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Path used for unix socket client/server endpoints have to be less than 104. When this is not the case, `bind: invalid argument` is returned. This commit checks the path length before calling `DialUnix` in order to provide an easier to understand error message. Signed-off-by: Christophe Fergeau <cfergeau@redhat.com>
For communication over unixgram, both the server and the client need an endpoint. They are filesystem paths which must be smaller than 104 bytes. This commit attempts to make them shorter while keeping them unique and non-guessable. Signed-off-by: Christophe Fergeau <cfergeau@redhat.com>
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With unixgram sockets, we need to specify a client endpoint, which is a
path on the filesystem with a maximum length of 104 bytes on macOS. When
using -device virtio-net,unixSocketPath=/tmp/vnet.sock, we need to create a
client endpoint before connecting to /tmp/vnet.sock. It's currently put
into
/Users/user/Library/Application Support, which is already fairlylong. Depending on the username, the 104 bytes are easily exceeded, this
has been causing problems to podman machine.
This PR will move the client endpoint to the same dir as the server endpoint to give more control over its location to vfkit users. It will also report a better error when the endpoint path length is more than 104 bytes, and it tries to shorten the client endpoint filename.
This fixes #194