From 8b719e51cf3e1b0ee7bee93a006bfa517fba4926 Mon Sep 17 00:00:00 2001
From: Andreas Schneider <asn@cynapses.org>
Date: Wed, 29 Sep 2010 11:26:35 +0200
Subject: misc: Move ssh_analyze_banner to a common location.

Don't duplicate functions!
---
 src/misc.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

(limited to 'src/misc.c')

diff --git a/src/misc.c b/src/misc.c
index ee78d8b0..b19c6c9f 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -681,6 +681,69 @@ char *ssh_path_expand_escape(ssh_session session, const char *s) {
 #undef MAX_BUF_SIZE
 }
 
+/**
+ * @internal
+ *
+ * @brief Analyze the SSH banner to find out if we have a SSHv1 or SSHv2
+ * server.
+ *
+ * @param  session      The session to analyze the banner from.
+ * @param  ssh1         The variable which is set if it is a SSHv1 server.
+ * @param  ssh2         The variable which is set if it is a SSHv2 server.
+ *
+ * @return 0 on success, < 0 on error.
+ *
+ * @see ssh_get_banner()
+ */
+int ssh_analyze_banner(ssh_session session, int *ssh1, int *ssh2) {
+  const char *banner = session->clientbanner;
+  const char *openssh;
+
+  ssh_log(session, SSH_LOG_RARE, "Analyzing banner: %s", banner);
+
+  if (strncmp(banner, "SSH-", 4) != 0) {
+    ssh_set_error(session, SSH_FATAL, "Protocol mismatch: %s", banner);
+    return -1;
+  }
+
+  /*
+   * Typical banners e.g. are:
+   * SSH-1.5-blah
+   * SSH-1.99-blah
+   * SSH-2.0-blah
+   */
+  switch(banner[4]) {
+    case '1':
+      *ssh1 = 1;
+      if (banner[6] == '9') {
+        *ssh2 = 1;
+      } else {
+        *ssh2 = 0;
+      }
+      break;
+    case '2':
+      *ssh1 = 0;
+      *ssh2 = 1;
+      break;
+    default:
+      ssh_set_error(session, SSH_FATAL, "Protocol mismatch: %s", banner);
+      return -1;
+  }
+
+  openssh = strstr(banner, "OpenSSH");
+  if (openssh != NULL) {
+    int major, minor;
+    major = strtol(openssh + 8, (char **) NULL, 10);
+    minor = strtol(openssh + 10, (char **) NULL, 10);
+    session->openssh = SSH_VERSION_INT(major, minor, 0);
+    ssh_log(session, SSH_LOG_RARE,
+        "We are talking to an OpenSSH client version: %d.%d (%x)",
+        major, minor, session->openssh);
+  }
+
+  return 0;
+}
+
 /** @} */
 
 /* vim: set ts=4 sw=4 et cindent: */
-- 
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