Display configuration information when using the -V option...

config.h

@@ -187,8 +187,29 @@ typedef unsigned long u_long;
 #define EOPTNEG 8
 #endif
 
-/* tftp-hpa version */
+/* tftp-hpa version and configuration strings */
 
 #include "version.h"
 
+#ifdef WITH_READLINE
+#define WITH_READLINE_STR ", with readline"
+#else
+#define WITH_READLINE_STR ", without readline"
+#endif
+
+#ifdef WITH_REGEX
+#define WITH_REGEX_STR ", with remap"
+#else
+#define WITH_REGEX_STR ", without remap"
+#endif
+
+#ifdef HAVE_LIBWRAP
+#define HAVE_LIBWRAP_STR ", with tcpwrappers"
+#else
+#define HAVE_LIBWRAP_STR ", without tcpwrappers"
+#endif
+
+#define TFTP_CONFIG_STR VERSION WITH_READLINE_STR
+#define TFTPD_CONFIG_STR VERSION WITH_REGEX_STR HAVE_LIBWRAP_STR
+
 #endif

tftp/main.c

@@ -192,8 +192,8 @@ main(int argc, char *argv[])
 	    verbose = 1;
 	    break;
 	  case 'V':
-	    /* Print version to stdout and exit */
+	    /* Print version and configuration to stdout and exit */
-	    printf("%s\n", VERSION);
+	    printf("%s\n", TFTP_CONFIG_STR);
 	    exit(0);
 	  default:
 	    fprintf(stderr, "Usage: %s [-v] [host]\n", argv[0]);

tftp/tftp.1

@@ -59,7 +59,8 @@ command below.)
 Default to verbose mode.
 .TP
 .B \-V
-Print the version number to standard output, then exit gracefully.
+Print the version number and configuration to standard output, then
+exit gracefully.
 .SH COMMANDS
 Once
 .B tftp

tftpd/tftpd.8

@@ -107,7 +107,9 @@ default is 900 (15 minutes.)
 Specify the use of filename remapping.  The
 .I remap-file
 is a file containing the remapping rules.  See the section on filename
-remapping below.
+remapping below.  This option may not be compiled in, see
+.B "tftpd \-V"
+to verify whether or not it is available.
 .TP
 .B \-v
 Increase the logging verbosity of
@@ -119,7 +121,8 @@ Indicate that a specific RFC 2347 TFTP option should never be
 accepted.
 .TP
 .B \-V
-Print the version number to standard output, then exit gracefully.
+Print the version number and configuration to standard output, then
+exit gracefully.
 .SH "RFC 2347 OPTION NEGOTIATION"
 This version of
 .B tftpd
@@ -213,12 +216,17 @@ will allow only publicly readable files (o+r) to be accessed.  Files
 may be written only if they already exist and are publicly writable,
 unless the
 .B \-c
-option is specified.
+option is specified.  Note that this extends the concept of ``public''
-Note that this extends the concept of ``public'' to include all users
+to include all users on all hosts that can be reached through the
-on all hosts that can be reached through the network; this may not be
+network; this may not be appropriate on all systems, and its
-appropriate on all systems, and its implications should be considered
+implications should be considered before enabling TFTP service.
-before enabling TFTP service.  Typically, some kind of firewall or
+Typically, some kind of firewall or packet-filter solution should be
-packet-filter solution should be employed.
+employed.  If appropriately compiled (see the output of
+.BR  "tftpd \-V" )
+.B tftpd
+will query the
+.BR hosts_access (5)
+database for access control information.  This may be slow.
 .PP
 The server should be set to have the user ID with the lowest possible
 privilege; please see the
@@ -277,5 +285,6 @@ added patches by Markus Gutschke and Gero Kulhman.
 .SH "SEE ALSO"
 .BR tftp (1),
 .BR egrep (1),
+.BR hosts_access (5),
 .BR regex (7),
 .BR inetd (8).

tftpd/tftpd.c

@@ -259,8 +259,8 @@ main(int argc, char **argv)
       verbosity++;
       break;
     case 'V':
-      /* Print version to stdout and exit */
+      /* Print configuration to stdout and exit */
-      printf("%s\n", VERSION);
+      printf("%s\n", TFTPD_CONFIG_STR);
       exit(0);
       break;
     default: