diff mbox

slirp: allow host port 0 for hostfwd

Message ID 20170225213158.32452-1-vincent@bernat.im
State New
Headers show

Commit Message

Vincent Bernat Feb. 25, 2017, 9:31 p.m. UTC 
The OS will allocate automatically a free port. This is useful if you
want to be sure to not get any port conflict. You still have to figure
out which port you got, for example with "lsof" (this could be exposed
in the monitor if needed).

Example of use:

     $ qemu-system-x86_64 -net user,hostfwd=127.0.0.1:0-:22 ...

Then, get your port with:

     $ lsof -np 1474 | grep LISTEN
     qemu-syst 31777 bernat 12u IPv4 [...] TCP 127.0.0.1:35145 (LISTEN)

Signed-off-by: Vincent Bernat <vincent@bernat.im>
---
 net/slirp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox

Patch

diff --git a/net/slirp.c b/net/slirp.c
index f97ec233454e..11b2dd249a79 100644
--- a/net/slirp.c
+++ b/net/slirp.c
@@ -487,7 +487,7 @@  static int slirp_hostfwd(SlirpState *s, const char *redir_str,
         goto fail_syntax;
     }
     host_port = strtol(buf, &end, 0);
-    if (*end != '\0' || host_port < 1 || host_port > 65535) {
+    if (*end != '\0' || host_port < 0 || host_port > 65535) {
         goto fail_syntax;
     }