Patched Makefile with edits from Rune Magnus

software/Makefile

@@ -1,4 +1,4 @@
-CFLAGS = -Wall -Wextra -Wunused-parameter -std=c99 -O3 -I Keccak -I /usr/include/libftdi1
+CFLAGS = -Wall -Wextra -Werror -std=c99 -O3 -I Keccak -I /usr/include/libftdi1
 
 all: infnoise
 
@@ -6,4 +6,4 @@ infnoise: infnoise.c infnoise.h healthcheck.c writeentropy.c daemon.c Keccak/Kec
 	$(CC) $(CFLAGS) -o infnoise infnoise.c healthcheck.c writeentropy.c daemon.c Keccak/KeccakF-1600-reference.c -lftdi -lm -lrt
 
 clean:
-	$(RM) -f infnoise
+	$(RM) infnoise

software/README

@@ -172,3 +172,15 @@ to /usr/local/bin, your udev file would like this:
 
 $ cat /etc/udev/rules.d/75-infnoise.rules
 ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6015", RUN+="/usr/local/bin/infnoise --dev-random --daemon"
+
+I personally run the infnoise tool by hand from a bash shell, typically to test devices like this:
+
+$ sudo ./infnoise --debug --no-output
+
+To avoid having to type 'sudo' each time, I created the following udev rules,
+which worked on my particular Ubuntu 14.04 based laptop:
+
+$ cat 30-infnoise.rules 
+SUBSYSTEM=="usb", ATTRS{idProduct}=="6015", ATTRS{idVendor}=="0403", GROUP="dialout", MODE="0664"
+
+Note that my username is in the dialout group.

software/infnoise.c

@@ -128,7 +128,11 @@ static bool initializeUSB(struct ftdi_context *ftdic, char **message) {
     ftdi_init(ftdic);
     // Open FTDI device based on FT240X vendor & product IDs
     if(ftdi_usb_open(ftdic, 0x0403, 0x6015) < 0) {
-        *message = "Can't find Infinite Noise Multiplier\n";
+        if(!isSuperUser()) {
+            *message = "Can't find Infinite Noise Multiplier.  Try running as super user?\n";
+        } else {
+            *message = "Can't find Infinite Noise Multiplier\n";
+        }
         return false;
     }
 
@@ -233,11 +237,6 @@ int main(int argc, char **argv)
         }
     }
 
-    if(!isSuperUser()) {
-        fputs("Super user access needed.\n", stderr);
-        return 1;
-    }
-
     if(!multiplierAssigned && writeDevRandom) {
         outputMultiplier = 2u; // Don't throw away entropy when writing to /dev/random unless told to do so
     }

software/tools/Makefile

@@ -1,4 +1,4 @@
-CFLAGS=-Wall -Wextra -Wunused-parameter -std=c99 -O3
+CFLAGS=-Wall -Wextra -Werror -std=c99 -O3
 
 all: passgen healthcheck findlongest entcheck hex2bin bin2hex flipbits dice