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This address family is used in communication between virtual machines and their hosts. Advantages include that no virtual ethernet adapter and their respective address configuration and routing need to be setup. Rather, with this new link type, only a single yggdrasil interface can exist inside of the virtual machine. It can also be used inside of containers. There, the advantage over existing link types like unix sockets include, that no mount point need to be shared with the host and container. This provides more isolation. More information: https://man7.org/linux/man-pages/man7/vsock.7.html https://gist.github.com/nrdmn/7971be650919b112343b1cb2757a3fe6
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| package core | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "net" | ||
| "net/url" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| "github.com/Arceliar/phony" | ||
| "github.com/mdlayher/vsock" | ||
| ) | ||
|
|
||
| type linkVSOCK struct { | ||
| phony.Inbox | ||
| *links | ||
| } | ||
|
|
||
| func (l *links) newLinkVSOCK() *linkVSOCK { | ||
| lt := &linkVSOCK{ | ||
| links: l, | ||
| } | ||
| return lt | ||
| } | ||
|
|
||
| func (l *linkVSOCK) dial(ctx context.Context, url *url.URL, info linkInfo, options linkOptions) (net.Conn, error) { | ||
| localPort, err := strconv.Atoi(url.Port()) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("no VSOCK port specified: %w", err) | ||
| } | ||
| contextId, err := urlParseContextId(url) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("Unknown VSOCK host and cannot parse as numerical contextID: %w", err) | ||
| } | ||
| return vsock.Dial(contextId, uint32(localPort), nil) | ||
|
Check failure Code scanning / CodeQL Incorrect conversion between integer types High
Incorrect conversion of an integer with architecture-dependent bit size from
strconv.Atoi Error loading related location Loading |
||
| } | ||
|
|
||
| func (l *linkVSOCK) listen(ctx context.Context, url *url.URL, _ string) (net.Listener, error) { | ||
| localPort, err := strconv.Atoi(url.Port()) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("no VSOCK port specified: %w", err) | ||
| } | ||
| contextId, err := urlParseContextId(url) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("Unknown VSOCK host and cannot parse as numerical contextID: %w", err) | ||
| } | ||
| return vsock.ListenContextID(contextId, uint32(localPort), nil) | ||
|
Check failure Code scanning / CodeQL Incorrect conversion between integer types High
Incorrect conversion of an integer with architecture-dependent bit size from
strconv.Atoi Error loading related location Loading |
||
| } | ||
|
|
||
| func urlParseContextId(u *url.URL) (uint32, error) { | ||
| var contextId uint32 | ||
|
|
||
| switch strings.ToLower(u.Hostname()) { | ||
| case "hypervisor": | ||
| contextId = vsock.Hypervisor | ||
| case "local": | ||
| contextId = vsock.Local | ||
| case "host": | ||
| contextId = vsock.Host | ||
| default: | ||
| parsedHost, err := strconv.Atoi(u.Hostname()) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| contextId = uint32(parsedHost) | ||
|
Check failure Code scanning / CodeQL Incorrect conversion between integer types High
Incorrect conversion of an integer with architecture-dependent bit size from
strconv.Atoi Error loading related location Loading |
||
| } | ||
| return contextId, nil | ||
| } | ||