Add functions to get the extension count, name and data.

include/libssh/sftp.h

@@ -201,6 +201,40 @@ int sftp_init(SFTP_SESSION *sftp);
  */
 int sftp_get_error(SFTP_SESSION *sftp);
 
+/**
+ * @brief Get the count of extensions provided by the server.
+ *
+ * @param  sftp         The sftp session to use.
+ *
+ * @return The count of extensions provided by the server, 0 on error or
+ *         not available.
+ */
+unsigned int sftp_extensions_get_count(SFTP_SESSION *sftp);
+
+/**
+ * @brief Get the name of the extension provided by the server.
+ *
+ * @param  sftp         The sftp session to use.
+ *
+ * @param  index        The index number of the extension name you want.
+ *
+ * @return              The name of the extension.
+ */
+const char *sftp_extensions_get_name(SFTP_SESSION *sftp, unsigned int index);
+
+/**
+ * @brief Get the data of the extension provided by the server.
+ *
+ * This is normally the version number of the extension.
+ *
+ * @param  sftp         The sftp session to use.
+ *
+ * @param  index        The index number of the extension data you want.
+ *
+ * @return              The data of the extension.
+ */
+const char *sftp_extensions_get_data(SFTP_SESSION *sftp, unsigned int index);
+
 /**
  * @brief Open a directory used to obtain directory entries.
  *

libssh/sftp.c

@@ -587,6 +587,38 @@ int sftp_init(SFTP_SESSION *sftp) {
   return 0;
 }
 
+unsigned int sftp_extensions_get_count(SFTP_SESSION *sftp) {
+  if (sftp == NULL || sftp->ext == NULL) {
+    return 0;
+  }
+
+  return sftp->ext->count;
+}
+
+const char *sftp_extensions_get_name(SFTP_SESSION *sftp, unsigned int index) {
+  if (sftp == NULL || sftp->ext == NULL || sftp->ext->name == NULL) {
+    return NULL;
+  }
+
+  if (index > sftp->ext->count) {
+    return NULL;
+  }
+
+  return sftp->ext->name[index];
+}
+
+const char *sftp_extensions_get_data(SFTP_SESSION *sftp, unsigned int index) {
+  if (sftp == NULL || sftp->ext == NULL || sftp->ext->data == NULL) {
+    return NULL;
+  }
+
+  if (index > sftp->ext->count) {
+    return NULL;
+  }
+
+  return sftp->ext->data[index];
+}
+
 static REQUEST_QUEUE *request_queue_new(SFTP_MESSAGE *msg) {
   REQUEST_QUEUE *queue = NULL;
 

sample.c

@@ -283,10 +283,12 @@ void do_sftp(SSH_SESSION *session){
     SFTP_FILE *fichier;
     SFTP_FILE *to;
     int len=1;
-    int i;
+    unsigned int i;
     char data[8000]={0};
     char *link;
 
+    unsigned int count;
+
     if(!sftp_session){
         fprintf(stderr, "sftp error initialising channel: %s\n",
             ssh_get_error(session));
@@ -298,6 +300,14 @@ void do_sftp(SSH_SESSION *session){
         return;
     }
 
+    printf("Additional SFTP extensions provided by the server:\n");
+    count = sftp_extensions_get_count(sftp_session);
+    for (i = 0; i < count; i++) {
+      printf("\t%s, version: %s\n",
+          sftp_extensions_get_name(sftp_session, i),
+          sftp_extensions_get_data(sftp_session, i));
+    }
+
     /* test symlink and readlink */
     if (sftp_symlink(sftp_session, "/tmp/this_is_the_link",
           "/tmp/sftp_symlink_test") < 0) {