crowcbr / ft_ping

my own ping

ft_ping

my own ping

Changes

• more simple code
• no norminette
• add flag 't'
• delete flag '6' : don't work IP6 in this network

Use

• sudo ./ft_ping [options]

• add options:

  • -c stop after replies
  • -D print timestamps
  • -h print help and exit
  • -i seconds between sending each packet
  • -n no dns name resolution
  • -q quiet output
  • -v verbose output
  • -V print version and exit
  • -w reply wait in seconds
  • -t define time to live

References

• W.R. Stevens - UNIX Network Programming Volume 1

ICMP-Header:

All ICMP packets have an 8-byte header and variable-sized data section. The first 4 bytes of the header have fixed format, while the last 4 bytes depend on the type/code of that ICMP packe

Test

• blocks outgoing ICMP packets : sudo iptables -A OUTPUT -p icmp -j DROP
• allow sending ICMP packets : sudo iptables -D OUTPUT -p icmp -j DROP