[Qemu-devel] [PATCH 2/3] sockets: switch vnc to new code, support vnc port auto-allocation.

[Gerd Hoffmann <kraxel@redhat.com>]

This patch switches the vnc code ofer to the new socket helper
functions.

It adds support IPv6 support and for automatically allocating an unused
vnc display port.  The latter is handled ising a to= option, specifying
the upper limit for the display number to try.  Scanning is started at
the display number given in the display specification, i.e. this command
line:

    -vnc localhost:7,to=11

will try displays 7 to 11 (inclusive).

There are also new "ipv4" and "ipv6" options to make qemu try only
the specified internet protocol version.

The display actually allocated can be queried using the "info vnc"
monitor command.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 vnc.c |  113 +++++++++++++++--------------------------------------------------
 1 files changed, 26 insertions(+), 87 deletions(-)

diff --git a/vnc.c b/vnc.c
index 9df4dbe..f0ebebd 100644
--- a/vnc.c
+++ b/vnc.c
@@ -2139,8 +2139,6 @@ static void vnc_listen_read(void *opaque)
     }
 }
 
-extern int parse_host_port(struct sockaddr_in *saddr, const char *str);
-
 void vnc_display_init(DisplayState *ds)
 {
     VncState *vs;
@@ -2291,18 +2289,11 @@ int vnc_display_password(DisplayState *ds, const char *password)
 
 int vnc_display_open(DisplayState *ds, const char *display)
 {
-    struct sockaddr *addr;
-    struct sockaddr_in iaddr;
-#ifndef _WIN32
-    struct sockaddr_un uaddr;
-    const char *p;
-#endif
-    int reuse_addr, ret;
-    socklen_t addrlen;
     VncState *vs = ds ? (VncState *)ds->opaque : vnc_state;
     const char *options;
     int password = 0;
     int reverse = 0;
+    int to_port = 0;
 #ifdef CONFIG_VNC_TLS
     int tls = 0, x509 = 0;
 #endif
@@ -2321,6 +2312,8 @@ int vnc_display_open(DisplayState *ds, const char *display)
 	    password = 1; /* Require password auth */
 	} else if (strncmp(options, "reverse", 7) == 0) {
 	    reverse = 1;
+	} else if (strncmp(options, "to=", 3) == 0) {
+            to_port = atoi(options+3) + 5900;
 #ifdef CONFIG_VNC_TLS
 	} else if (strncmp(options, "tls", 3) == 0) {
 	    tls = 1; /* Require TLS */
@@ -2398,67 +2391,14 @@ int vnc_display_open(DisplayState *ds, const char *display)
 	}
 #endif
     }
-#ifndef _WIN32
-    if (strstart(display, "unix:", &p)) {
-	addr = (struct sockaddr *)&uaddr;
-	addrlen = sizeof(uaddr);
-
-	vs->lsock = socket(PF_UNIX, SOCK_STREAM, 0);
-	if (vs->lsock == -1) {
-	    fprintf(stderr, "Could not create socket\n");
-	    free(vs->display);
-	    vs->display = NULL;
-	    return -1;
-	}
-
-	uaddr.sun_family = AF_UNIX;
-	memset(uaddr.sun_path, 0, 108);
-	snprintf(uaddr.sun_path, 108, "%s", p);
-
-	if (!reverse) {
-	    unlink(uaddr.sun_path);
-	}
-    } else
-#endif
-    {
-	addr = (struct sockaddr *)&iaddr;
-	addrlen = sizeof(iaddr);
-
-	if (parse_host_port(&iaddr, display) < 0) {
-	    fprintf(stderr, "Could not parse VNC address\n");
-	    free(vs->display);
-	    vs->display = NULL;
-	    return -1;
-	}
-
-	iaddr.sin_port = htons(ntohs(iaddr.sin_port) + (reverse ? 0 : 5900));
-
-	vs->lsock = socket(PF_INET, SOCK_STREAM, 0);
-	if (vs->lsock == -1) {
-	    fprintf(stderr, "Could not create socket\n");
-	    free(vs->display);
-	    vs->display = NULL;
-	    return -1;
-	}
-
-	reuse_addr = 1;
-	ret = setsockopt(vs->lsock, SOL_SOCKET, SO_REUSEADDR,
-			 (const char *)&reuse_addr, sizeof(reuse_addr));
-	if (ret == -1) {
-	    fprintf(stderr, "setsockopt() failed\n");
-	    close(vs->lsock);
-	    vs->lsock = -1;
-	    free(vs->display);
-	    vs->display = NULL;
-	    return -1;
-	}
-    }
 
     if (reverse) {
-        if (connect(vs->lsock, addr, addrlen) == -1) {
-            fprintf(stderr, "Connection to VNC client failed\n");
-            close(vs->lsock);
-            vs->lsock = -1;
+        /* connect to viewer */
+        if (strncmp(display, "unix:", 5) == 0)
+            vs->lsock = unix_connect(display+5);
+        else
+            vs->lsock = inet_connect(display, SOCK_STREAM);
+        if (-1 == vs->lsock) {
             free(vs->display);
             vs->display = NULL;
             return -1;
@@ -2466,26 +2406,25 @@ int vnc_display_open(DisplayState *ds, const char *display)
             vs->csock = vs->lsock;
             vs->lsock = -1;
             vnc_connect(vs);
-            return 0;
         }
-    }
-
-    if (bind(vs->lsock, addr, addrlen) == -1) {
-	fprintf(stderr, "bind() failed\n");
-	close(vs->lsock);
-	vs->lsock = -1;
-	free(vs->display);
-	vs->display = NULL;
-	return -1;
-    }
+        return 0;
 
-    if (listen(vs->lsock, 1) == -1) {
-	fprintf(stderr, "listen() failed\n");
-	close(vs->lsock);
-	vs->lsock = -1;
-	free(vs->display);
-	vs->display = NULL;
-	return -1;
+    } else {
+        /* listen for connects */
+        char *dpy;
+        dpy = qemu_malloc(256);
+        if (strncmp(display, "unix:", 5) == 0) {
+            strcpy(dpy, "unix:");
+            vs->lsock = unix_listen(display, dpy+5, 256-5);
+        } else {
+            vs->lsock = inet_listen(display, dpy, 256, SOCK_STREAM, 5900);
+        }
+        if (-1 == vs->lsock) {
+            free(dpy);
+        } else {
+            free(vs->display);
+            vs->display = dpy;
+        }
     }
 
     return qemu_set_fd_handler2(vs->lsock, vnc_listen_poll, vnc_listen_read, NULL, vs);
-- 
1.5.6.5