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List:       netfilter
Subject:    (libiptc) iptc_delete_entry or iptc_delete_num_entry?
From:       Craig Davison <cd () securityfocus ! com>
Date:       2003-01-31 20:57:37
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Hi,

Should I be using iptc_delete_num_entry or iptc_delete_entry to delete 
rules from a chain? I can't seem to find documentation for the 
parameters of iptc_delete_entry (please point me in the right direction if 
it exists!), and I'm not 100% sure what to pass for the rulenum parameter 
to iptc_delete_num_entry.

The only documentation I have for iptc_delete_num_entry is the 
Querying-libiptc-HOWTO from the LDP, and it says that rulenum is a rule 
number starting at 1 for the first rule.

So let's say I want to delete every rule one at a time from a chain. Do I 
have to manually increase my own rulenum counter for every rule, or is 
there some way to get rulenum from an ipt_entry?

Example:

iptc_handle_t htable;
const char *chain = "INPUT";
struct ipt_entry *entry;
int rulenum = 0, is_chain_changed = 0;

if (!(htable = iptc_init ("filter")))
{
  printf ("iptc_init: %s\n", iptc_strerror (errno));
  exit(0);
}

entry = (struct ipt_entry *)iptc_first_rule (chain, &htable);
while (entry)
{
  rulenum++;
  if (!(iptc_delete_num_entry (chain, rulenum, &htable)))
  {
    printf ("iptc_delete_num_entry: %s\n", iptc_strerror (errno));
    break;
  }

  is_chain_changed = 1;
  entry = (struct ipt_entry *)iptc_next_rule (entry, &htable);
}

if (is_chain_changed)
{
  if (!(iptc_commit (&htable)))
    fprintf (stderr, "iptc_commit: %s\n", iptc_strerror (errno));
}


Plus, is the rulenum going to change for the rest of the rules in a chain 
if I delete a rule? If not immediately, how about after I commit?

TIA for any help.

-- 
Craig Davison
Symantec Corporation
+1 (403) 213-3939 ext. 228

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