From 39d9e069e4e32332e374fc979cc891c0e5f30cf5 Mon Sep 17 00:00:00 2001
From: Neale Pickett <neale@lanl.gov>
Date: Thu, 3 Sep 2009 10:42:28 -0600
Subject: [PATCH] frobbed executable puzzle

---
 games/compaq/memfrob/Makefile |  9 +++++++++
 games/compaq/memfrob/frob.c   | 13 +++++++++++++
 games/compaq/memfrob/key      |  1 +
 games/compaq/memfrob/main.c   | 29 +++++++++++++++++++++++++++++
 4 files changed, 52 insertions(+)
 create mode 100644 games/compaq/memfrob/Makefile
 create mode 100644 games/compaq/memfrob/frob.c
 create mode 100644 games/compaq/memfrob/key
 create mode 100644 games/compaq/memfrob/main.c

diff --git a/games/compaq/memfrob/Makefile b/games/compaq/memfrob/Makefile
new file mode 100644
index 0000000..201b694
--- /dev/null
+++ b/games/compaq/memfrob/Makefile
@@ -0,0 +1,9 @@
+LDFLAGS = -static
+
+all: frob main
+
+main: CFLAGS = -Dfrobbed='"$(shell tr -d '\n' < key | ./frob)"'
+
+clean:
+	rm -rf main frob
+
diff --git a/games/compaq/memfrob/frob.c b/games/compaq/memfrob/frob.c
new file mode 100644
index 0000000..aa737d2
--- /dev/null
+++ b/games/compaq/memfrob/frob.c
@@ -0,0 +1,13 @@
+#include <unistd.h>
+
+int
+main(int argc, char *argv[])
+{
+  char c;
+
+  while (read(0, &c, 1)) {
+    c ^= 3;
+    write(1, &c, 1);
+  }
+  return 0;
+}
diff --git a/games/compaq/memfrob/key b/games/compaq/memfrob/key
new file mode 100644
index 0000000..c4b3aba
--- /dev/null
+++ b/games/compaq/memfrob/key
@@ -0,0 +1 @@
+lawful forths Amanda
diff --git a/games/compaq/memfrob/main.c b/games/compaq/memfrob/main.c
new file mode 100644
index 0000000..c63319b
--- /dev/null
+++ b/games/compaq/memfrob/main.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <string.h>
+
+int
+main(int argc, char *argv[])
+{
+  char reply[256];
+
+  printf("What is the password? ");
+  fflush(stdout);
+  if (fgets(reply, sizeof(reply), stdin)) {
+    char *p;
+
+    for (p = reply; *p; p += 1) {
+      if ('\n' == *p) {
+        *p = '\0';
+        break;
+      }
+      *p = *p ^ 3;
+    }
+    if (strcmp(reply, frobbed)) {
+      printf("No it isn't!\n");
+    } else {
+      printf("Congratulations.\n");
+    }
+  }
+
+  return 0;
+}