Change net/socket.c to use socket_*() functions

Use socket_*() functions from include/qemu/sockets.h instead of
listen()/bind()/connect()/parse_host_port(). socket_*() fucntions are
QAPI based and this patch  performs this api conversion since
everything will be using QAPI based sockets in the future. Also add a
helper function socket_address_to_string() in util/qemu-sockets.c
which returns the string representation of socket address. The task was
listed on http://wiki.qemu.org/BiteSizedTasks page.

Signed-off-by: Ashijeet Acharya <ashijeetacharya@gmail.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

net/socket.c

@@ -489,90 +489,105 @@ static int net_socket_listen_init(NetClientState *peer,
 {
     NetClientState *nc;
     NetSocketState *s;
-    struct sockaddr_in saddr;
-    int fd, ret;
+    SocketAddress *saddr;
+    int ret;
+    Error *local_error = NULL;
 
-    if (parse_host_port(&saddr, host_str) < 0)
-        return -1;
-
-    fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
-    if (fd < 0) {
-        perror("socket");
+    saddr = socket_parse(host_str, &local_error);
+    if (saddr == NULL) {
+        error_report_err(local_error);
         return -1;
     }
-    qemu_set_nonblock(fd);
 
-    socket_set_fast_reuse(fd);
-
-    ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
+    ret = socket_listen(saddr, &local_error);
     if (ret < 0) {
-        perror("bind");
-        closesocket(fd);
-        return -1;
-    }
-    ret = listen(fd, 0);
-    if (ret < 0) {
-        perror("listen");
-        closesocket(fd);
+        qapi_free_SocketAddress(saddr);
+        error_report_err(local_error);
         return -1;
     }
 
     nc = qemu_new_net_client(&net_socket_info, peer, model, name);
     s = DO_UPCAST(NetSocketState, nc, nc);
     s->fd = -1;
-    s->listen_fd = fd;
+    s->listen_fd = ret;
     s->nc.link_down = true;
 
     qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
+    qapi_free_SocketAddress(saddr);
     return 0;
 }
 
+typedef struct {
+    NetClientState *peer;
+    SocketAddress *saddr;
+    char *model;
+    char *name;
+} socket_connect_data;
+
+static void socket_connect_data_free(socket_connect_data *c)
+{
+    qapi_free_SocketAddress(c->saddr);
+    g_free(c->model);
+    g_free(c->name);
+    g_free(c);
+}
+
+static void net_socket_connected(int fd, Error *err, void *opaque)
+{
+    socket_connect_data *c = opaque;
+    NetSocketState *s;
+    char *addr_str = NULL;
+    Error *local_error = NULL;
+
+    addr_str = socket_address_to_string(c->saddr, &local_error);
+    if (addr_str == NULL) {
+        error_report_err(local_error);
+        closesocket(fd);
+        goto end;
+    }
+
+    s = net_socket_fd_init(c->peer, c->model, c->name, fd, true);
+    if (!s) {
+        closesocket(fd);
+        goto end;
+    }
+
+    snprintf(s->nc.info_str, sizeof(s->nc.info_str),
+             "socket: connect to %s", addr_str);
+
+end:
+    g_free(addr_str);
+    socket_connect_data_free(c);
+}
+
 static int net_socket_connect_init(NetClientState *peer,
                                    const char *model,
                                    const char *name,
                                    const char *host_str)
 {
-    NetSocketState *s;
-    int fd, connected, ret;
-    struct sockaddr_in saddr;
+    socket_connect_data *c = g_new0(socket_connect_data, 1);
+    int fd = -1;
+    Error *local_error = NULL;
 
-    if (parse_host_port(&saddr, host_str) < 0)
-        return -1;
+    c->peer = peer;
+    c->model = g_strdup(model);
+    c->name = g_strdup(name);
+    c->saddr = socket_parse(host_str, &local_error);
+    if (c->saddr == NULL) {
+        goto err;
+    }
 
-    fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
+    fd = socket_connect(c->saddr, &local_error, net_socket_connected, c);
     if (fd < 0) {
-        perror("socket");
-        return -1;
+        goto err;
     }
-    qemu_set_nonblock(fd);
 
-    connected = 0;
-    for(;;) {
-        ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
-        if (ret < 0) {
-            if (errno == EINTR || errno == EWOULDBLOCK) {
-                /* continue */
-            } else if (errno == EINPROGRESS ||
-                       errno == EALREADY ||
-                       errno == EINVAL) {
-                break;
-            } else {
-                perror("connect");
-                closesocket(fd);
-                return -1;
-            }
-        } else {
-            connected = 1;
-            break;
-        }
-    }
-    s = net_socket_fd_init(peer, model, name, fd, connected);
-    if (!s)
-        return -1;
-    snprintf(s->nc.info_str, sizeof(s->nc.info_str),
-             "socket: connect to %s:%d",
-             inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
     return 0;
+
+err:
+    error_report_err(local_error);
+    socket_connect_data_free(c);
+    return -1;
 }
 
 static int net_socket_mcast_init(NetClientState *peer,