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-rw-r--r--print-ssh.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/print-ssh.c b/print-ssh.c
new file mode 100644
index 0000000..5207c52
--- /dev/null
+++ b/print-ssh.c
@@ -0,0 +1,99 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code
+ * distributions retain the above copyright notice and this paragraph
+ * in its entirety, and (2) distributions including binary code include
+ * the above copyright notice and this paragraph in its entirety in
+ * the documentation or other materials provided with the distribution.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
+ * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
+ * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE.
+ */
+
+/* \summary: Secure Shell (SSH) printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+#include "netdissect-ctype.h"
+
+#include "netdissect.h"
+#include "extract.h"
+
+static int
+ssh_print_version(netdissect_options *ndo, const u_char *pptr, u_int len)
+{
+ u_int idx = 0;
+
+ if ( GET_U_1(pptr+idx) != 'S' )
+ return 0;
+ idx++;
+ if ( GET_U_1(pptr+idx) != 'S' )
+ return 0;
+ idx++;
+ if ( GET_U_1(pptr+idx) != 'H' )
+ return 0;
+ idx++;
+ if ( GET_U_1(pptr+idx) != '-' )
+ return 0;
+ idx++;
+
+ while (idx < len) {
+ u_char c;
+
+ c = GET_U_1(pptr + idx);
+ if (c == '\n') {
+ /*
+ * LF without CR; end of line.
+ * Skip the LF and print the line, with the
+ * exception of the LF.
+ */
+ goto print;
+ } else if (c == '\r') {
+ /* CR - any LF? */
+ if ((idx+1) >= len) {
+ /* not in this packet */
+ goto trunc;
+ }
+ if (GET_U_1(pptr + idx + 1) == '\n') {
+ /*
+ * CR-LF; end of line.
+ * Skip the CR-LF and print the line, with
+ * the exception of the CR-LF.
+ */
+ goto print;
+ }
+
+ /*
+ * CR followed by something else; treat this as
+ * if it were binary data and don't print it.
+ */
+ goto trunc;
+ } else if (!ND_ASCII_ISPRINT(c) ) {
+ /*
+ * Not a printable ASCII character; treat this
+ * as if it were binary data and don't print it.
+ */
+ goto trunc;
+ }
+ idx++;
+ }
+trunc:
+ return -1;
+print:
+ ND_PRINT(": ");
+ nd_print_protocol_caps(ndo);
+ ND_PRINT(": %.*s", (int)idx, pptr);
+ return idx;
+}
+
+void
+ssh_print(netdissect_options *ndo, const u_char *pptr, u_int len)
+{
+ ndo->ndo_protocol = "ssh";
+
+ ssh_print_version(ndo, pptr, len);
+}