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- $ /usr/sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT
- #include <unistd.h>
- int main() {
- char *args[6];
- args[0] = "/usr/sbin/iptables";
- args[1] = "-I INPUT";
- args[2] = "-p tcp";
- args[3] = "--dport 80";
- args[4] = "-j ACCEPT";
- args[5] = NULL;
- execve(args[0], args, NULL);
- }
- $ ./code
- iptables v1.4.6: unknown protocol ` tcp' specified
- Try `iptables -h' or 'iptables --help' for more information.
- #include <unistd.h>
- int main() {
- char *args[6];
- args[0] = "/usr/sbin/iptables";
- args[1] = "-I INPUT";
- args[2] = "-ptcp";
- args[3] = "--dport 80";
- args[4] = "-j ACCEPT";
- args[5] = NULL;
- execve(args[0], args, NULL);
- }
- $./code
- iptables v1.4.6: unknown option `--dport 80'
- Try `iptables -h' or 'iptables --help' for more information.
- $ iptables --help
- iptables v1.4.6
- Usage: iptables -[AD] chain rule-specification [options]
- iptables -I chain [rulenum] rule-specification [options]
- iptables -R chain rulenum rule-specification [options]
- iptables -D chain rulenum [options]
- iptables -[LS] [chain [rulenum]] [options]
- iptables -[FZ] [chain] [options]
- iptables -[NX] chain
- iptables -E old-chain-name new-chain-name
- iptables -P chain target [options]
- iptables -h (print this help information)
- Commands:
- Either long or short options are allowed.
- --append -A chain Append to chain
- --delete -D chain Delete matching rule from chain
- --delete -D chain rulenum
- Delete rule rulenum (1 = first) from chain
- --insert -I chain [rulenum]
- Insert in chain as rulenum (default 1=first)
- --replace -R chain rulenum
- Replace rule rulenum (1 = first) in chain
- --list -L [chain [rulenum]]
- List the rules in a chain or all chains
- --list-rules -S [chain [rulenum]]
- Print the rules in a chain or all chains
- --flush -F [chain] Delete all rules in chain or all chains
- --zero -Z [chain [rulenum]]
- Zero counters in chain or all chains
- --new -N chain Create a new user-defined chain
- --delete-chain
- -X [chain] Delete a user-defined chain
- --policy -P chain target
- Change policy on chain to target
- --rename-chain
- -E old-chain new-chain
- Change chain name, (moving any references)
- Options:
- [!] --proto -p proto protocol: by number or name, eg. `tcp'
- [!] --source -s address[/mask][...]
- source specification
- [!] --destination -d address[/mask][...]
- destination specification
- [!] --in-interface -i input name[+]
- network interface name ([+] for wildcard)
- --jump -j target
- target for rule (may load target extension)
- --goto -g chain
- jump to chain with no return
- --match -m match
- extended match (may load extension)
- --numeric -n numeric output of addresses and ports
- [!] --out-interface -o output name[+]
- network interface name ([+] for wildcard)
- --table -t table table to manipulate (default: `filter')
- --verbose -v verbose mode
- --line-numbers print line numbers when listing
- --exact -x expand numbers (display exact values)
- [!] --fragment -f match second or further fragments only
- --modprobe=<command> try to insert modules using this command
- --set-counters PKTS BYTES set the counter during insert/append
- [!] --version -V print package version.
- #include <unistd.h>
- int main() {
- char *args[10];
- int i = 0;
- args[i++] = "/usr/sbin/iptables";
- args[i++] = "-I";
- args[i++] = "INPUT";
- args[i++] = "-p";
- args[i++] = "tcp";
- args[i++] = "--dport";
- args[i++] = "80";
- args[i++] = "-j";
- args[i++] = "ACCEPT";
- args[i++] = NULL;
- execve(args[0], args, NULL);
- }
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