Shell Worker

1. Add the echoserver shell support as a configure option.
2. Added some header and function checks to configure.
3. Use the new header and function checks to select includes
   in the echoserver.

configure.ac

@@ -53,8 +53,9 @@ AC_CHECK_SIZEOF([off_t])
 
 # Check headers/libs
 AC_CHECK_FUNCS([gethostbyname getaddrinfo gettimeofday inet_ntoa memset socket])
-AC_CHECK_HEADERS([sys/time.h])
+AC_CHECK_HEADERS([sys/time.h pty.h util.h termios.h])
 AC_CHECK_LIB([network],[socket])
+AC_CHECK_LIB([util],[forkpty])
 AC_CHECK_LIB([wolfssl],[wolfCrypt_Init],,[AC_MSG_ERROR([libwolfssl is required for ${PACKAGE}. It can be obtained from https://www.wolfssl.com/download.html/ .])])
 
 # DEBUG
@@ -112,6 +113,11 @@ AC_ARG_ENABLE([term],
     [AS_HELP_STRING([--disable-term],[Disable pseudo-terminal support (default: enabled)])],
     [ENABLED_PTERM=$enableval],[ENABLED_PTERM=yes])
 
+# shell support
+AC_ARG_ENABLE([shell],
+    [AS_HELP_STRING([--enable-shell],[Enable echoserver shell support (default: disabled)])],
+    [ENABLED_SHELL=$enableval],[ENABLED_SHELL=no])
+
 # Enable All
 AC_ARG_ENABLE([all],
     [AS_HELP_STRING([--enable-all],[Enable all wolfSSH features (default: disabled)])],
@@ -125,7 +131,7 @@ AC_ARG_ENABLE([distro],
 AS_IF([test "x$ENABLED_DISTRO" = "xyes"],
       [ENABLED_ALL=yes; enable_shared=yes; enable_static=yes])
 AS_IF([test "x$ENABLED_ALL" = "xyes"],
-      [ENABLED_KEYGEN=yes; ENABLED_SCP=yes; ENABLED_SFTP=yes; ENABLED_FWD=yes])
+      [ENABLED_KEYGEN=yes; ENABLED_SCP=yes; ENABLED_SFTP=yes; ENABLED_FWD=yes; ENABLED_SHELL=yes])
 AS_IF([test "x$ENABLED_INLINE" = "xno"],
       [AM_CPPFLAGS="$AM_CPPFLAGS -DNO_INLINE"])
 AS_IF([test "x$ENABLED_KEYGEN" = "xyes"],
@@ -138,6 +144,8 @@ AS_IF([test "x$ENABLED_FWD" = "xyes"],
       [AM_CPPFLAGS="$AM_CPPFLAGS -DWOLFSSH_FWD"])
 AS_IF([test "x$ENABLED_PTERM" = "xyes"],
       [AM_CPPFLAGS="$AM_CPPFLAGS -DWOLFSSH_TERM"])
+AS_IF([test "x$ENABLED_SHELL" = "xyes"],
+      [AM_CPPFLAGS="$AM_CPPFLAGS -DWOLFSSH_SHELL"])
 
 AM_CONDITIONAL([BUILD_EXAMPLE_SERVERS],[test "x$ENABLED_EXAMPLES" = "xyes"])
 AM_CONDITIONAL([BUILD_EXAMPLE_CLIENTS],[test "x$ENABLED_EXAMPLES" = "xyes"])
@@ -193,6 +201,7 @@ AS_ECHO(["   Features"])
 AS_ECHO(["   * Inline Code:               $ENABLED_INLINE"])
 AS_ECHO(["   * keygen:                    $ENABLED_KEYGEN"])
 AS_ECHO(["   * psuedo-terminal:           $ENABLED_PTERM"])
+AS_ECHO(["   * echoserver shell support:  $ENABLED_SHELL"])
 AS_ECHO(["   * scp:                       $ENABLED_SCP"])
 AS_ECHO(["   * sftp:                      $ENABLED_SFTP"])
 AS_ECHO(["   * TCP/IP Forwarding:         $ENABLED_FWD"])

examples/echoserver/echoserver.c

@@ -22,6 +22,10 @@
 #define WOLFSSH_TEST_ECHOSERVER
 
 
+#ifdef HAVE_CONFIG_H
+    #include <config.h>
+#endif
+
 #ifdef WOLFSSL_USER_SETTINGS
     #include <wolfssl/wolfcrypt/settings.h>
 #else
@@ -52,7 +56,15 @@
 #endif
 
 #ifdef WOLFSSH_SHELL
-//    #include <pty.h>
+    #ifdef HAVE_PTY_H
+        #include <pty.h>
+    #endif
+    #ifdef HAVE_UTIL_H
+        #include <util.h>
+    #endif
+    #ifdef HAVE_TERMIOS_H
+        #include <termios.h>
+    #endif
     #include <errno.h>
     #include <stdlib.h>
     #include <sys/select.h>
@@ -62,8 +74,6 @@
     #include <syslog.h>
     #include <stdarg.h>
     #include <pwd.h>
-    #include <util.h>
-    #include <termios.h>
 #endif
 
 
@@ -318,8 +328,6 @@ static int ssh_worker(thread_ctx_t* threadCtx) {
 #ifdef WOLFSSH_SHELL
 
 #define SE_BUF_SIZE         4096
-/* One can put any command to be run at startup in INIT_CMD1 */
-#define INIT_CMD1           " "
 
 typedef struct
 {
@@ -498,10 +506,6 @@ static int shell_worker(thread_ctx_t* threadCtx)
             return WS_FATAL_ERROR;
         }
 
-        memcpy((void *)buf_rx.buf, (void *)INIT_CMD1, sizeof(INIT_CMD1));
-        buf_rx.rdidx += sizeof(INIT_CMD1);
-        buf_rx.size += sizeof(INIT_CMD1);
-
         /*set sock_fd to non-blocking;
           select() blocks even if socket is set to non-blocking*/
         flags = fcntl(sock_fd, F_GETFL, 0);