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slirp: allow host port 0 for hostfwd

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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>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
This commit is contained in:
Vincent Bernat 2017-02-25 22:31:58 +01:00 committed by Samuel Thibault
parent 81b2d5ceb0
commit 0bed71edbc
1 changed files with 1 additions and 1 deletions
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2
net/slirp.c
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@ -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;
}