* preliminary java captcha cracker

* renamed dprintf to pwnprint to avoid conflicts.


git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/pwntcha/trunk@1000 92316355-f0b4-4df1-b90c-862c8a59935f

src/Makefile.am

@@ -9,6 +9,7 @@ pwntcha_SOURCES = \
     common.h \
     authimage.c \
     clubic.c \
+    java.c \
     linuxfr.c \
     livejournal.c \
     lmt.c \

src/common.h

@@ -35,7 +35,7 @@ extern char *argv0;
 extern char *share;
 
 /* debug function */
-void dprintf(const char *fmt, ...);
+void pwnprint(const char *fmt, ...);
 
 /* available CAPTCHA decoders */
 char *decode_authimage(struct image *img);

src/java.c

@@ -0,0 +1,91 @@
+/*
+ * java.c: decode java captchas I forgot about
+ * $Id$
+ *
+ * Copyright: (c) 2005 Sam Hocevar <sam@zoy.org>
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the Do What The Fuck You Want To
+ *   Public License as published by Banlu Kemiyatorn. See
+ *   http://sam.zoy.org/projects/COPYING.WTFPL for more details.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+#include "config.h"
+#include "common.h"
+
+/* Main function */
+char *decode_java(struct image *img)
+{
+    struct image *tmp;
+    int x, y, dx, dy, best = 0, bestx, besty;
+    int r, g, b, r2, g2, b2, r3, g3, b3, r4, g4, b4, i, j, c;
+
+    tmp = image_dup(img);
+    filter_threshold(tmp, 245);
+
+    for(dy = 0; dy < 20; dy++)
+    {
+        if(dy > -5 && dy < 5)
+            continue;
+
+        for(dx = -20; dx < 20; dx++)
+        {
+            int good = 0;
+
+            if(dx > -5 && dx < 5)
+                continue;
+
+            for(y = 0; y < tmp->height - dy; y++)
+            {
+                for(x = 0; x < tmp->width; x++)
+                {
+                    getpixel(tmp, x, y, &r, &g, &b);
+                    getpixel(tmp, x + dx, y + dy, &r2, &g2, &b2);
+
+                    if(r && r2)
+                        good++;
+                }
+            }
+
+            if(good > best)
+            {
+                best = good;
+                bestx = dx;
+                besty = dy;
+            }
+        }
+    }
+
+    for(y = 0; y < tmp->height - besty; y++)
+    {
+        for(x = 0; x < tmp->width; x++)
+        {
+            getpixel(tmp, x, y, &r, &g, &b);
+            getpixel(tmp, x + bestx, y + besty, &r2, &g2, &b2);
+            getpixel(tmp, x - bestx, y - besty, &r3, &g3, &b3);
+            getpixel(tmp, x + 2 * bestx, y + 2 * besty, &r4, &g4, &b4);
+
+            if(r && r2)
+            {
+                if(r3 && r4)
+                    setpixel(img, x, y, 0, 127, 0);
+                else
+                    setpixel(img, x, y, 0, 255, 255);
+            }
+            else if(r)
+                setpixel(img, x, y, 0, 0, 127);
+            else
+                setpixel(img, x, y, 0, 0, 0);
+        }
+    }
+
+    image_save(img, "test.bmp");
+    image_free(tmp);
+
+    return NULL;
+}
+

src/main.c

@@ -121,14 +121,14 @@ int main(int argc, char *argv[])
         img = image_load(argv[optind]);
         if(!img)
         {
-            dprintf("cannot load %s\n", input);
+            pwnprint("cannot load %s\n", input);
             printf("\n");
             continue;
         }
 
         count = filter_count(img);
-        dprintf("image size %ix%i, %i colours\n",
-                img->width, img->height, count);
+        pwnprint("image size %ix%i, %i colours\n",
+                 img->width, img->height, count);
 
         if(!strcmp(mode, "test"))
             result = decode_test(img);
@@ -136,6 +136,8 @@ int main(int argc, char *argv[])
             result = decode_authimage(img);
         else if(!strcmp(mode, "clubic"))
             result = decode_clubic(img);
+        else if(!strcmp(mode, "java"))
+            result = decode_java(img);
         else if(!strcmp(mode, "linuxfr"))
             result = decode_linuxfr(img);
         else if(!strcmp(mode, "livejournal"))
@@ -158,72 +160,77 @@ int main(int argc, char *argv[])
         {
             if(img->width == 155 && img->height == 50)
             {
-                dprintf("probably an authimage captcha\n");
+                pwnprint("probably an authimage captcha\n");
                 result = decode_authimage(img);
             }
             else if(img->width == 175 && img->height == 35)
             {
-                dprintf("probably a livejournal captcha\n");
+                pwnprint("probably a livejournal captcha\n");
                 result = decode_livejournal(img);
             }
             else if(img->width == 100 && img->height == 40 && count < 6)
             {
-                dprintf("probably a linuxfr captcha\n");
+                pwnprint("probably a linuxfr captcha\n");
                 result = decode_linuxfr(img);
             }
             else if(img->width == 69 && img->height == 35)
             {
-                dprintf("probably a lmt.lv captcha\n");
+                pwnprint("probably a lmt.lv captcha\n");
                 result = decode_lmt(img);
             }
             else if(img->width == 208 && img->height == 26)
             {
-                dprintf("probably a Paypal captcha\n");
+                pwnprint("probably a Paypal captcha\n");
                 result = decode_paypal(img);
             }
             else if(img->width == 320 && img->height == 50)
             {
-                dprintf("probably a phpBB captcha\n");
+                pwnprint("probably a phpBB captcha\n");
                 result = decode_phpbb(img);
             }
             else if(img->width == 170 && img->height == 50)
             {
-                dprintf("probably a Xanga captcha\n");
+                pwnprint("probably a Xanga captcha\n");
                 result = decode_xanga(img);
             }
             else if(img->height <= 40 && count < 10)
             {
-                dprintf("probably a scode/trencaspammers captcha\n");
+                pwnprint("probably a scode/trencaspammers captcha\n");
                 result = decode_scode(img);
             }
             else if(img->height <= 30 && count < 100)
             {
-                dprintf("probably a clubic captcha\n");
+                pwnprint("probably a clubic captcha\n");
                 result = decode_clubic(img);
             }
             else if(img->height == 69)
             {
-                dprintf("probably a slashdot captcha\n");
+                pwnprint("probably a slashdot captcha\n");
                 result = decode_slashdot(img);
             }
+            else if(img->width == 200 && img->height == 100)
+            {
+                pwnprint("probably a java captcha\n");
+                result = decode_java(img);
+            }
             else if(img->width == 200 && img->height == 40)
             {
-                dprintf("probably a tickets.com captcha\n");
+                pwnprint("probably a tickets.com captcha\n");
                 result = decode_tickets(img);
             }
             else if(img->height == 61)
             {
-                dprintf("probably a vbulletin captcha\n");
+                pwnprint("probably a vbulletin captcha\n");
                 result = decode_vbulletin(img);
             }
             else if(img->width == 480 && img->height == 360 && count == 253)
             {
-                dprintf("probably not a captcha\n");
+                pwnprint("probably not a captcha\n");
                 result = decode_easter_eggs(img);
             }
             else
             {
-                dprintf("could not guess captcha type\n");
+                pwnprint("could not guess captcha type\n");
                 printf("\n");
                 image_free(img);
                 continue;
@@ -234,7 +241,7 @@ int main(int argc, char *argv[])
 
         if(!result)
         {
-            dprintf("sorry, decoding failed\n");
+            pwnprint("sorry, decoding failed\n");
             printf("\n");
             continue;
         }
@@ -247,7 +254,7 @@ int main(int argc, char *argv[])
     return 0;
 }
 
-void dprintf(const char *fmt, ...)
+void pwnprint(const char *fmt, ...)
 {
     va_list args;
 

src/scode.c

@@ -221,8 +221,9 @@ static char find_glyph(struct image *img, int xmin, int xmax)
         case 2378: return '7';
         case 5375: return '8';
         case 4710: return '9';
+        /* quotatispro font */
         default:
-            dprintf("don't know about checksum %i\n", count);
+            pwnprint("don't know about checksum %i\n", count);
             return '?';
     }
 }