[gvfs] ftp: Parse SITE HELP output to detect chmod support

[Benjamin Otte <otte src gnome org>]

commit 9a4f327cdc9dde66e7417c2c4b426d936b407f02
Author: Benjamin Otte <otte redhat com>
Date:   Sun Jan 23 23:55:01 2011 +0100

    ftp: Parse SITE HELP output to detect chmod support
    
    Support for it will come in later patches.
    
    The patch also detects chgrp support, but we're not intending to use it
    yet.

 daemon/gvfsbackendftp.c |   56 +++++++++++++++++++++++++++++++++++++++++++++++
 daemon/gvfsbackendftp.h |    4 ++-
 2 files changed, 59 insertions(+), 1 deletions(-)
---
diff --git a/daemon/gvfsbackendftp.c b/daemon/gvfsbackendftp.c
index a257d75..4f0a44b 100644
--- a/daemon/gvfsbackendftp.c
+++ b/daemon/gvfsbackendftp.c
@@ -142,6 +142,61 @@ gvfs_backend_ftp_determine_features (GVfsFtpTask *task)
 }
 
 static void
+gvfs_backend_ftp_determine_site_features (GVfsFtpTask *task)
+{
+  const struct {
+    const char *        name;        	/* name of feature */
+    GVfsFtpFeature      enable;         /* flags to enable with this feature */
+  } features[] = {
+    { "CHMOD", G_VFS_FTP_FEATURE_CHMOD },
+    { "CHGRP", G_VFS_FTP_FEATURE_CHGRP },
+  };
+  guint i, j;
+  char **reply;
+
+  if (g_vfs_ftp_task_is_in_error (task))
+    return;
+
+  if (!g_vfs_ftp_task_send_and_check (task, 0, NULL, NULL, &reply, "SITE HELP"))
+    {
+      g_vfs_ftp_task_clear_error (task);
+      return;
+    }
+
+  if (g_strv_length (reply) == 1)
+    {
+      /* vsftpd returns just a single string, so we split it into multiple
+       * and then treat it like a regular reply */
+      char **split;
+
+      split = g_strsplit (reply[0], " ", -1);
+      g_strfreev (reply);
+      reply = split;
+    }
+
+  for (i = 1; reply[i]; i++)
+    {
+      char *feature = reply[i];
+
+      while (g_ascii_isspace (feature[0]))
+        feature++;
+
+      for (j = 0; j < G_N_ELEMENTS (features); j++)
+        {
+          if (g_ascii_strcasecmp (feature, features[j].name) == 0)
+            {
+              g_debug ("# site feature %s supported\n", features[j].name);
+              task->backend->features |= 1 << features[j].enable;
+            }
+        }
+    }
+
+  g_strfreev (reply);
+
+  return;
+}
+
+static void
 gvfs_backend_ftp_determine_system (GVfsFtpTask *task)
 {
   static const struct {
@@ -507,6 +562,7 @@ try_login:
     }
   g_vfs_ftp_task_setup_connection (&task);
   gvfs_backend_ftp_determine_system (&task);
+  gvfs_backend_ftp_determine_site_features (&task);
   gvfs_backend_ftp_setup_directory_cache (ftp);
   gvfs_backend_ftp_determine_default_location (&task);
 
diff --git a/daemon/gvfsbackendftp.h b/daemon/gvfsbackendftp.h
index 71b7af4..f5983b5 100644
--- a/daemon/gvfsbackendftp.h
+++ b/daemon/gvfsbackendftp.h
@@ -38,7 +38,9 @@ typedef enum {
   G_VFS_FTP_FEATURE_EPSV,
   G_VFS_FTP_FEATURE_UTF8,
   G_VFS_FTP_FEATURE_AUTH_TLS,
-  G_VFS_FTP_FEATURE_AUTH_SSL
+  G_VFS_FTP_FEATURE_AUTH_SSL,
+  G_VFS_FTP_FEATURE_CHMOD,
+  G_VFS_FTP_FEATURE_CHGRP
 } GVfsFtpFeature;
 #define G_VFS_FTP_FEATURES_DEFAULT (0)