[Qemu-devel] [PATCH FYI 24/46] qemu-nbd: convert to use the QAPI SocketAddress object

["Daniel P. Berrange" <berrange@redhat.com>]

The qemu-nbd program currently uses a QemuOpts objects
when setting up sockets. Switch it over to use the
QAPI SocketAddress objects instead.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 qemu-nbd.c | 102 +++++++++++++++++++++++--------------------------------------
 1 file changed, 38 insertions(+), 64 deletions(-)

diff --git a/qemu-nbd.c b/qemu-nbd.c
index d9644b2..67ef811 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -49,7 +49,7 @@
 static NBDExport *exp;
 static int verbose;
 static char *srcpath;
-static char *sockpath;
+static SocketAddress *saddr;
 static int persistent = 0;
 static enum { RUNNING, TERMINATE, TERMINATING, TERMINATED } state;
 static int shared = 1;
@@ -213,52 +213,6 @@ static void termsig_handler(int signum)
     qemu_notify_event();
 }
 
-static void combine_addr(char *buf, size_t len, const char* address,
-                         uint16_t port)
-{
-    /* If the address-part contains a colon, it's an IPv6 IP so needs [] */
-    if (strstr(address, ":")) {
-        snprintf(buf, len, "[%s]:%u", address, port);
-    } else {
-        snprintf(buf, len, "%s:%u", address, port);
-    }
-}
-
-static int tcp_socket_incoming(const char *address, uint16_t port)
-{
-    char address_and_port[128];
-    Error *local_err = NULL;
-
-    combine_addr(address_and_port, 128, address, port);
-    int fd = inet_listen(address_and_port, NULL, 0, SOCK_STREAM, 0, &local_err);
-
-    if (local_err != NULL) {
-        error_report_err(local_err);
-    }
-    return fd;
-}
-
-static int unix_socket_incoming(const char *path)
-{
-    Error *local_err = NULL;
-    int fd = unix_listen(path, NULL, 0, &local_err);
-
-    if (local_err != NULL) {
-        error_report_err(local_err);
-    }
-    return fd;
-}
-
-static int unix_socket_outgoing(const char *path)
-{
-    Error *local_err = NULL;
-    int fd = unix_connect(path, &local_err);
-
-    if (local_err != NULL) {
-        error_report_err(local_err);
-    }
-    return fd;
-}
 
 static void *show_parts(void *arg)
 {
@@ -287,8 +241,10 @@ static void *nbd_client_thread(void *arg)
     pthread_t show_parts_thread;
     Error *local_error = NULL;
 
-    sock = unix_socket_outgoing(sockpath);
+
+    sock = socket_connect(saddr, &local_error, NULL, NULL);
     if (sock < 0) {
+        error_report_err(local_error);
         goto out;
     }
 
@@ -399,6 +355,33 @@ static void nbd_update_server_fd_handler(int fd)
     }
 }
 
+
+static SocketAddress *nbd_build_socket_address(const char *sockpath,
+                                               const char *bindto,
+                                               const char *port)
+{
+    SocketAddress *saddr;
+
+    saddr = g_new0(SocketAddress, 1);
+    if (sockpath) {
+        saddr->kind = SOCKET_ADDRESS_KIND_UNIX;
+        saddr->q_unix = g_new0(UnixSocketAddress, 1);
+        saddr->q_unix->path = g_strdup(sockpath);
+    } else {
+        saddr->kind = SOCKET_ADDRESS_KIND_INET;
+        saddr->inet = g_new0(InetSocketAddress, 1);
+        saddr->inet->host = g_strdup(bindto);
+        if (port) {
+            saddr->inet->port = g_strdup(port);
+        } else  {
+            saddr->inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
+        }
+    }
+
+    return saddr;
+}
+
+
 int main(int argc, char **argv)
 {
     BlockBackend *blk;
@@ -407,8 +390,9 @@ int main(int argc, char **argv)
     uint32_t nbdflags = 0;
     bool disconnect = false;
     const char *bindto = "0.0.0.0";
+    const char *port = NULL;
+    char *sockpath = NULL;
     char *device = NULL;
-    int port = NBD_DEFAULT_PORT;
     off_t fd_size;
     QemuOpts *sn_opts = NULL;
     const char *sn_id_or_name = NULL;
@@ -441,7 +425,6 @@ int main(int argc, char **argv)
     };
     int ch;
     int opt_ind = 0;
-    int li;
     char *end;
     int flags = BDRV_O_RDWR;
     int partition = -1;
@@ -529,14 +512,7 @@ int main(int argc, char **argv)
             bindto = optarg;
             break;
         case 'p':
-            li = strtol(optarg, &end, 0);
-            if (*end) {
-                errx(EXIT_FAILURE, "Invalid port `%s'", optarg);
-            }
-            if (li < 1 || li > 65535) {
-                errx(EXIT_FAILURE, "Port out of range `%s'", optarg);
-            }
-            port = (uint16_t)li;
+            port = optarg;
             break;
         case 'o':
                 dev_offset = strtoll (optarg, &end, 0);
@@ -695,6 +671,8 @@ int main(int argc, char **argv)
         snprintf(sockpath, 128, SOCKET_PATH, basename(device));
     }
 
+    saddr = nbd_build_socket_address(sockpath, bindto, port);
+
     if (qemu_init_main_loop(&local_err)) {
         error_report_err(local_err);
         exit(EXIT_FAILURE);
@@ -752,13 +730,9 @@ int main(int argc, char **argv)
         errx(EXIT_FAILURE, "%s", error_get_pretty(local_err));
     }
 
-    if (sockpath) {
-        fd = unix_socket_incoming(sockpath);
-    } else {
-        fd = tcp_socket_incoming(bindto, port);
-    }
-
+    fd = socket_listen(saddr, &local_err);
     if (fd < 0) {
+        error_report_err(local_err);
         return 1;
     }
 
-- 
2.4.3