From 0bed71edbc323de12ed1e5390a85a013f6a143f4 Mon Sep 17 00:00:00 2001 From: Vincent Bernat Date: Sat, 25 Feb 2017 22:31:58 +0100 Subject: [PATCH] slirp: allow host port 0 for hostfwd 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 Signed-off-by: Samuel Thibault --- net/slirp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/slirp.c b/net/slirp.c index f97ec23345..11b2dd249a 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; }