remote: use enum helpers for parsing remote driver transport

Instead of open-coding a string -> enum conversion, use the enum helpers
for the remote driver transport. The old code uses STRCASEEQ, so we must
force the URI transport to lowercase for sake of back-compatibility.
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

src/remote/remote_driver.c

@@ -49,11 +49,35 @@
 #include "virauth.h"
 #include "virauthconfig.h"
 #include "virstring.h"
+#include "c-ctype.h"
 
 #define VIR_FROM_THIS VIR_FROM_REMOTE
 
 VIR_LOG_INIT("remote.remote_driver");
 
+typedef enum {
+    REMOTE_DRIVER_TRANSPORT_TLS,
+    REMOTE_DRIVER_TRANSPORT_UNIX,
+    REMOTE_DRIVER_TRANSPORT_SSH,
+    REMOTE_DRIVER_TRANSPORT_LIBSSH2,
+    REMOTE_DRIVER_TRANSPORT_EXT,
+    REMOTE_DRIVER_TRANSPORT_TCP,
+    REMOTE_DRIVER_TRANSPORT_LIBSSH,
+
+    REMOTE_DRIVER_TRANSPORT_LAST,
+} remoteDriverTransport;
+
+VIR_ENUM_DECL(remoteDriverTransport);
+VIR_ENUM_IMPL(remoteDriverTransport,
+              REMOTE_DRIVER_TRANSPORT_LAST,
+              "tls",
+              "unix",
+              "ssh",
+              "libssh2",
+              "ext",
+              "tcp",
+              "libssh");
+
 #if SIZEOF_LONG < 8
 # define HYPER_TO_TYPE(_type, _to, _from) \
     do { \
@@ -176,12 +200,19 @@ static int remoteSplitURIScheme(virURIPtr uri,
     if (VIR_STRNDUP(*driver, uri->scheme, p ? p - uri->scheme : -1) < 0)
         return -1;
 
-    if (p &&
-        VIR_STRDUP(*transport, p + 1) < 0) {
+    if (p) {
+        if (VIR_STRDUP(*transport, p + 1) < 0) {
             VIR_FREE(*driver);
             return -1;
         }
 
+        p = *transport;
+        while (*p) {
+            *p = c_tolower(*p);
+            p++;
+        }
+    }
+
     return 0;
 }
 
@@ -778,15 +809,7 @@ doRemoteOpen(virConnectPtr conn,
              virConfPtr conf,
              unsigned int flags)
 {
-    enum {
-        trans_tls,
-        trans_unix,
-        trans_ssh,
-        trans_libssh2,
-        trans_ext,
-        trans_tcp,
-        trans_libssh,
-    } transport;
+    int transport;
 #ifndef WIN32
     VIR_AUTOFREE(char *) daemonPath = NULL;
 #endif
@@ -815,52 +838,39 @@ doRemoteOpen(virConnectPtr conn,
     if (conn->uri) {
         if (!transport_str) {
             if (conn->uri->server)
-                transport = trans_tls;
+                transport = REMOTE_DRIVER_TRANSPORT_TLS;
             else
-                transport = trans_unix;
+                transport = REMOTE_DRIVER_TRANSPORT_UNIX;
         } else {
-            if (STRCASEEQ(transport_str, "tls")) {
-                transport = trans_tls;
-            } else if (STRCASEEQ(transport_str, "unix")) {
-                if (conn->uri->server) {
+            if ((transport = remoteDriverTransportTypeFromString(transport_str)) < 0) {
+                virReportError(VIR_ERR_INVALID_ARG, "%s",
+                               _("remote_open: transport in URL not recognised "
+                                 "(should be tls|unix|ssh|ext|tcp|libssh2|libssh)"));
+                return VIR_DRV_OPEN_ERROR;
+            }
+
+            if (transport == REMOTE_DRIVER_TRANSPORT_UNIX &&
+                conn->uri->server) {
                 virReportError(VIR_ERR_INVALID_ARG,
                                _("using unix socket and remote "
                                  "server '%s' is not supported."),
                                conn->uri->server);
                 return VIR_DRV_OPEN_ERROR;
-                } else {
-                    transport = trans_unix;
-                }
-            } else if (STRCASEEQ(transport_str, "ssh")) {
-                transport = trans_ssh;
-            } else if (STRCASEEQ(transport_str, "libssh2")) {
-                transport = trans_libssh2;
-            } else if (STRCASEEQ(transport_str, "ext")) {
-                transport = trans_ext;
-            } else if (STRCASEEQ(transport_str, "tcp")) {
-                transport = trans_tcp;
-            } else if (STRCASEEQ(transport_str, "libssh")) {
-                transport = trans_libssh;
-            } else {
-                virReportError(VIR_ERR_INVALID_ARG, "%s",
-                               _("remote_open: transport in URL not recognised "
-                                 "(should be tls|unix|ssh|ext|tcp|libssh2|libssh)"));
-                return VIR_DRV_OPEN_ERROR;
             }
         }
     } else {
         /* No URI, then must be probing so use UNIX socket */
-        transport = trans_unix;
+        transport = REMOTE_DRIVER_TRANSPORT_UNIX;
     }
 
     /* Remote server defaults to "localhost" if not specified. */
     if (conn->uri && conn->uri->port != 0) {
         if (virAsprintf(&port, "%d", conn->uri->port) < 0)
             goto failed;
-    } else if (transport == trans_tls) {
+    } else if (transport == REMOTE_DRIVER_TRANSPORT_TLS) {
         if (VIR_STRDUP(port, LIBVIRTD_TLS_PORT) < 0)
             goto failed;
-    } else if (transport == trans_tcp) {
+    } else if (transport == REMOTE_DRIVER_TRANSPORT_TCP) {
         if (VIR_STRDUP(port, LIBVIRTD_TCP_PORT) < 0)
             goto failed;
     } /* Port not used for unix, ext., default for ssh */
@@ -944,7 +954,7 @@ doRemoteOpen(virConnectPtr conn,
     VIR_DEBUG("proceeding with name = %s", name);
 
     /* For ext transport, command is required. */
-    if (transport == trans_ext && !command) {
+    if (transport == REMOTE_DRIVER_TRANSPORT_EXT && !command) {
         virReportError(VIR_ERR_INVALID_ARG, "%s",
                        _("remote_open: for 'ext' transport, command is required"));
         goto failed;
@@ -952,8 +962,8 @@ doRemoteOpen(virConnectPtr conn,
 
     VIR_DEBUG("Connecting with transport %d", transport);
     /* Connect to the remote service. */
-    switch (transport) {
-    case trans_tls:
+    switch ((remoteDriverTransport)transport) {
+    case REMOTE_DRIVER_TRANSPORT_TLS:
         if (conf && !tls_priority &&
             virConfGetValueString(conf, "tls_priority", &tls_priority) < 0)
             goto failed;
@@ -976,7 +986,7 @@ doRemoteOpen(virConnectPtr conn,
         goto failed;
 #endif
 
-    case trans_tcp:
+    case REMOTE_DRIVER_TRANSPORT_TCP:
         priv->client = virNetClientNewTCP(priv->hostname, port, AF_UNSPEC);
         if (!priv->client)
             goto failed;
@@ -991,7 +1001,7 @@ doRemoteOpen(virConnectPtr conn,
 
         break;
 
-    case trans_libssh2:
+    case REMOTE_DRIVER_TRANSPORT_LIBSSH2:
         if (!sockname) {
             /* Right now we don't support default session connections */
             if (flags & VIR_DRV_OPEN_REMOTE_USER) {
@@ -1026,7 +1036,7 @@ doRemoteOpen(virConnectPtr conn,
         priv->is_secure = 1;
         break;
 
-    case trans_libssh:
+    case REMOTE_DRIVER_TRANSPORT_LIBSSH:
         if (!sockname) {
             /* Right now we don't support default session connections */
             if (flags & VIR_DRV_OPEN_REMOTE_USER) {
@@ -1062,7 +1072,7 @@ doRemoteOpen(virConnectPtr conn,
         break;
 
 #ifndef WIN32
-    case trans_unix:
+    case REMOTE_DRIVER_TRANSPORT_UNIX:
         if (!sockname) {
             if (flags & VIR_DRV_OPEN_REMOTE_USER)
                 sockname = remoteGetUNIXSocketNonRoot();
@@ -1088,7 +1098,7 @@ doRemoteOpen(virConnectPtr conn,
         priv->is_secure = 1;
         break;
 
-    case trans_ssh:
+    case REMOTE_DRIVER_TRANSPORT_SSH:
         if (!command && VIR_STRDUP(command, "ssh") < 0)
             goto failed;
 
@@ -1120,7 +1130,7 @@ doRemoteOpen(virConnectPtr conn,
         priv->is_secure = 1;
         break;
 
-    case trans_ext: {
+    case REMOTE_DRIVER_TRANSPORT_EXT: {
         char const *cmd_argv[] = { command, NULL };
         if (!(priv->client = virNetClientNewExternal(cmd_argv)))
             goto failed;
@@ -1132,15 +1142,20 @@ doRemoteOpen(virConnectPtr conn,
 
 #else /* WIN32 */
 
-    case trans_unix:
-    case trans_ssh:
-    case trans_ext:
+    case REMOTE_DRIVER_TRANSPORT_UNIX:
+    case REMOTE_DRIVER_TRANSPORT_SSH:
+    case REMOTE_DRIVER_TRANSPORT_EXT:
         virReportError(VIR_ERR_INVALID_ARG, "%s",
                        _("transport methods unix, ssh and ext are not supported "
                          "under Windows"));
         goto failed;
 
 #endif /* WIN32 */
+
+    case REMOTE_DRIVER_TRANSPORT_LAST:
+    default:
+        virReportEnumRangeError(remoteDriverTransport, transport);
+        goto failed;
     } /* switch (transport) */