[dspam-users] blocking ips of spam source in firewall

[Raj]

Hi

i want to block the ips of spam sources immediately as soon as dspam detects 
them as spam

dspam does a logs these ips correctly into my /var/log/maillog file so i know 
that things are working correctly

on the linux console i use the following command to block an ip address 

/sbin/iptables -I INPUT -s 111.111.111.111 -j DROP

this code snippet below is from the dspam source ie dspam.c file in the src 
directory

the variable called "ip" contains the ip address which is logged to the maillog 
file

i understand that just a single line is required after the last line to execute 
the command but i am not sure of the C syntax

can someone help me ?

###########

int tracksource(DSPAM_CTX *CTX) {
  char ip[32];

  if (!dspam_getsource (CTX, ip, sizeof (ip)))
  {
    if (CTX->totals.innocent_learned + CTX->totals.innocent_classified > 2500) {
      if (CTX->result == DSR_ISSPAM && 
          _ds_match_attribute(agent_config, "TrackSources", "spam")) {
        FILE *file;
        char dropfile[MAX_FILENAME_LENGTH];
        LOG (LOG_INFO, "spam detected from %s", ip);


###########

thanks
raj