Lets ping 163.172.250.16 or 42.fr https://manpages.debian.org/bullseye/inetutils-ping/ping.1.en.html
Allowd functions are :
gettimeofday : explicit exit : explicit inet_ntop / inet_pton : convert IP sstring format to dest and inverse nthos / htons : convert host to network bytes and inverse signal / alarm / usleep : explicit socket / setsockopt / close sendto / recvmsg : sendto can be use to initiate connection as well it seems use sendto + SOCK_RAW for the socket getpid / getuid : to check if root getaddrinfo / getnameinfo / freeaddrinfo. strerror / gai_strerror.
fcntl, poll et ppoll is strictly forbidden.
IP Hdr Dump: 45 00 54 00 10 bb 00 40 09 01 0c cd 0a 00 02 0f a3 ac fa 10 Vr HL TOS Len ID Flg off TTL Pro cks Src Dst Data 4 5 00 0054 10bb 0 0040 09 01 0ccd 10.0.2.15 163.172.250.16