[OE-core] [PATCH 5/5] runqemu: set default device and hostfwd for slirp

[Robert Yang]

There is no network rather than lo whitout set device, so set it by
default. And set hostfwd: 2222 -> 22, 2323 -> 23

[YOCTO #7887]

Signed-off-by: Robert Yang <liezhi.yang at windriver.com>
---
 meta/conf/machine/include/qemuboot-x86.inc |  1 -
 meta/conf/machine/qemuarm64.conf           |  1 -
 scripts/runqemu                            | 34 ++++++++++++++++++++++++++++--
 3 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/meta/conf/machine/include/qemuboot-x86.inc b/meta/conf/machine/include/qemuboot-x86.inc
index 0870294..06ac983 100644
--- a/meta/conf/machine/include/qemuboot-x86.inc
+++ b/meta/conf/machine/include/qemuboot-x86.inc
@@ -13,4 +13,3 @@ QB_AUDIO_OPT = "-soundhw ac97,es1370"
 QB_KERNEL_CMDLINE_APPEND = "vga=0 uvesafb.mode_option=640x480-32 oprofile.timer=1 uvesafb.task_timeout=-1"
 # Add the 'virtio-rng-pci' device otherwise the guest may run out of entropy
 QB_OPT_APPEND = "-vga vmware -show-cursor -usb -usbdevice tablet -device virtio-rng-pci"
-QB_SLIRP_OPT = "-net nic,model=e1000 -net user,hostfwd=tcp::2222-:22"
diff --git a/meta/conf/machine/qemuarm64.conf b/meta/conf/machine/qemuarm64.conf
index df2010c..7a5570c 100644
--- a/meta/conf/machine/qemuarm64.conf
+++ b/meta/conf/machine/qemuarm64.conf
@@ -18,7 +18,6 @@ QB_KERNEL_CMDLINE_APPEND = "console=ttyAMA0,38400"
 # Add the 'virtio-rng-pci' device otherwise the guest may run out of entropy
 QB_OPT_APPEND = "-show-cursor -device virtio-rng-pci -monitor null"
 QB_TAP_OPT = "-netdev tap,id=net0,ifname=@TAP@,script=no,downscript=no -device virtio-net-device,netdev=net0,mac=@MAC@"
-QB_SLIRP_OPT = "-netdev user,id=net0 -device virtio-net-device,netdev=net0"
 QB_ROOTFS_OPT = "-drive id=disk0,file=@ROOTFS@,if=none,format=raw -device virtio-blk-device,drive=disk0"
 QB_SERIAL_OPT = "-device virtio-serial-device -chardev null,id=virtcon -device virtconsole,chardev=virtcon"
 QB_TCPSERIAL_OPT = " -device virtio-serial-device -chardev socket,id=virtcon,port=@PORT@,host=127.0.0.1 -device virtconsole,chardev=virtcon"
diff --git a/scripts/runqemu b/scripts/runqemu
index a10270c..7123b8f 100755
--- a/scripts/runqemu
+++ b/scripts/runqemu
@@ -147,6 +147,19 @@ def get_first_file(cmds):
                     return f
     return ''
 
+def check_free_port(host, port):
+    """ Check whether the port is free or not """
+    import socket
+    from contextlib import closing
+
+    with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
+        if sock.connect_ex((host, port)) == 0:
+            # Port is open, so not free
+            return False
+        else:
+            # Port is not open, so free
+            return True
+
 class BaseConfig(object):
     def __init__(self):
         # Vars can be merged with .qemuboot.conf, use a dict to manage them.
@@ -751,14 +764,31 @@ class BaseConfig(object):
 
         self.nfs_running = True
 
-
     def setup_slirp(self):
         """Setup user networking"""
 
         if self.fstype == 'nfs':
             self.setup_nfs()
         self.kernel_cmdline_script += ' ip=dhcp'
-        self.set('NETWORK_CMD', self.get('QB_SLIRP_OPT'))
+        # Port mapping
+        hostfwd = ",hostfwd=tcp::2222-:22,hostfwd=tcp::2323-:23"
+        qb_slirp_opt_default = "-netdev user,id=net0%s -device virtio-net-pci,netdev=net0" % hostfwd
+        qb_slirp_opt = self.get('QB_SLIRP_OPT') or qb_slirp_opt_default
+        # Figure out the port
+        ports = re.findall('hostfwd=[^-]*:([0-9]+)-[^,-]*', qb_slirp_opt)
+        ports = [int(i) for i in ports]
+        # Find a free port to avoid conflicts
+        for p in ports[:]:
+            p_new = p
+            while not check_free_port('127.0.0.1', p_new):
+                p_new += 1
+                while p_new in ports:
+                        p_new += 1
+            if p != p_new:
+                ports.append(p_new)
+                qb_slirp_opt = re.sub(':%s-' % p, ':%s-' % p_new, qb_slirp_opt)
+                logger.info("Port forward changed: %s -> %s" % (p, p_new))
+        self.set('NETWORK_CMD', qb_slirp_opt)
 
     def setup_tap(self):
         """Setup tap"""
-- 
2.9.0