[PATCH v2] misc-progs: getipstat: Refactor + extend

[Robin Roevens <robin.roevens@disroot.org>]

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 * Return output of iptables directly instead of writing it to files.
 * Make iptables wait for 5s if xtables is locked by another iptables
 process. (--wait 5 argument)
 * Add optional parameter "-x" to have iptables report exact numbers.
 * Add optional parameter "-f" to display  the filter table  (default).
 * Add optional parameter "-n" to display the nat table.
 * Add optional parameter "-m" to display the mangle table.
  * Adapt iptables.cgi and guardian.cgi to catch getipstat output
  instead of reading temp-files.

Signed-off-by: Robin Roevens <robin.roevens(a)disroot.org>
---
 html/cgi-bin/guardian.cgi  | 12 ++-----
 html/cgi-bin/iptables.cgi  | 18 ++++------
 src/misc-progs/getipstat.c | 67 +++++++++++++++++++++++++++++++++-----
 3 files changed, 66 insertions(+), 31 deletions(-)

diff --git a/html/cgi-bin/guardian.cgi b/html/cgi-bin/guardian.cgi
index fb16be00e..552c67211 100644
--- a/html/cgi-bin/guardian.cgi
+++ b/html/cgi-bin/guardian.cgi
@@ -829,12 +829,9 @@ sub GetBlockedHosts() {
 	my @hosts;
 
 	# Launch helper to get chains from iptables.
-	system('/usr/local/bin/getipstat');
+	open (FILE, '/usr/local/bin/getipstat | ');
 
-	# Open temporary file which contains the chains and rules.
-	open (FILE, '/var/tmp/iptables.txt');
-
-	# Loop through the entire file.
+	# Loop through the entire output.
 	while (<FILE>) {
 		my $line = $_;
 
@@ -864,11 +861,6 @@ sub GetBlockedHosts() {
 	# Close filehandle.
 	close(FILE);
 
-	# Remove recently created temporary files of the "getipstat" binary.
-	system("rm -f /var/tmp/iptables.txt");
-	system("rm -f /var/tmp/iptablesmangle.txt");
-	system("rm -f /var/tmp/iptablesnat.txt");
-
 	# Convert entries, sort them, write back and store the sorted entries into new array.
 	my @sorted = map  { $_->[0] }
              sort { $a->[1] <=> $b->[1] }
diff --git a/html/cgi-bin/iptables.cgi b/html/cgi-bin/iptables.cgi
index b52d74fcf..f900562d9 100644
--- a/html/cgi-bin/iptables.cgi
+++ b/html/cgi-bin/iptables.cgi
@@ -44,8 +44,6 @@ my %cgiparams=();
 
 &Header::getcgihash(\%cgiparams);
 
-system('/usr/local/bin/getipstat');
-
 &Header::showhttpheaders();
 &Header::openpage($Lang::tr{'ipts'}, 1, '');
 &Header::openbigbox('100%', 'LEFT');
@@ -84,11 +82,11 @@ print <<END
 END
 ;
 
-# We´ll open the txt files and extract each line, if the line
+# We´ll get iptables output and examine each line, if the line
 # start with an Chain the the name, start- and endline of the
 # chain is extracted into a hash
 
-	open (FILE, '/var/tmp/iptables.txt');
+	open (FILE, '/usr/local/bin/getipstat | ');
 	while (<FILE>){
 
 		$iplines[$lines] = $_;
@@ -206,11 +204,11 @@ print <<END
 END
 ;
 
-# We´ll open the txt files and extract each line, if the line
+# We´ll get iptables output and examine each line, if the line
 # start with an Chain the the name, start- and endline of the
 # chain is extracted into a hash
 
-	open (FILE, '/var/tmp/iptablesmangle.txt');
+	open (FILE, '/usr/local/bin/getipstat -m | ');
 	while (<FILE>){
 
 		$ipmlines[$manlines] = $_;
@@ -333,11 +331,11 @@ print <<END
 END
 ;
 
-# We´ll open the txt files and extract each line, if the line
+# We´ll get iptables output and examine each line, if the line
 # start with an Chain the the name, start- and endline of the
 # chain is extracted into a hash
 
-	open (FILE, '/var/tmp/iptablesnat.txt');
+	open (FILE, '/usr/local/bin/getipstat -n | ');
 	while (<FILE>){
 
 		$ipnatlines[$natlines] = $_;
@@ -433,7 +431,3 @@ print "</table></div><br />";
 &Header::closebox();
 &Header::closebigbox();
 &Header::closepage();
-
-system("rm -f /var/tmp/iptables.txt");
-system("rm -f /var/tmp/iptablesmangle.txt");
-system("rm -f /var/tmp/iptablesnat.txt");
diff --git a/src/misc-progs/getipstat.c b/src/misc-progs/getipstat.c
index c806d54a9..99d053bbf 100644
--- a/src/misc-progs/getipstat.c
+++ b/src/misc-progs/getipstat.c
@@ -2,6 +2,15 @@
  *
  * Get the list from IPTABLES -L
  * 
+ * Optional commandline parameters:
+ *  -x 
+ *   instruct iptables to expand numbers
+ *  -f 
+ *   display filter table 
+ *  -n
+ *   display nat table
+ *  -m
+ *   display mangle table
  */
 
 #include <stdio.h>
@@ -9,20 +18,60 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <sys/types.h>
-#include <fcntl.h>
 #include "setuid.h"
 
-
-int main(void)
+int main(int argc, char** argv)
 {
+	// Set defaults
+	// first argument has to be "iptables" since execve executes the program pointed to by filename
+	// but /sbin/iptables is actually a symlink to /sbin/xtables-legacy-multi hence that program is executed
+	// however without the notion that it was called as "iptables". So we have to pass "iptables" as first
+	// argument.
+	char *args[10] = {"iptables", "--list", "--verbose", "--numeric", "--wait", "5", NULL, NULL, NULL, NULL};
+	char *usage = "getipstat [-x][-f|-n|-m]";
+	unsigned int pcount = 6;
+	unsigned int table_set = 0;
+
+	int opt;
+	
 	if (!(initsetuid()))
 		exit(1);
 
-	safe_system("/sbin/iptables -L -v -n > /var/tmp/iptables.txt");
-	safe_system("/sbin/iptables -L -v -n -t nat > /var/tmp/iptablesnat.txt");
-	safe_system("/sbin/iptables -t mangle -L -v -n > /var/tmp/iptablesmangle.txt");
-	safe_system("chown nobody.nobody /var/tmp/iptables.txt /var/tmp/iptablesnat.txt /var/tmp/iptablesmangle.txt");
-	
-	return 0;
+	// Parse command line arguments
+	if (argc > 1) {
+		while ((opt = getopt(argc, argv, "xfnm")) != -1) {
+			switch(opt) {
+				case 'x':
+					args[pcount++] = "--exact";
+					break;
+				case 'f':
+					table_set++;
+					break;
+				case 'n':
+					if (table_set == 0) {
+						args[pcount++] = "--table";
+						args[pcount++] = "nat";
+					}
+					table_set++;
+					break;
+				case 'm':
+					if (table_set == 0) {
+						args[pcount++] = "--table";
+						args[pcount++] = "mangle";
+					}
+					table_set++;
+					break;
+				default:
+					fprintf(stderr, "\nBad argument given.\n\n%s\n", usage);
+					exit(1);
+			}
+		}
+		if (table_set > 1) {
+			fprintf(stderr, "\nArguments -f/-n/-m are mutualy exclusive.\n\n%s\n", usage);
+			exit(1);
+		}
+	}
+
+	return run("/sbin/iptables", args);
 }
 
-- 
2.31.1


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