int ping_recv (PING * p)
{
socklen_t fromlen = sizeof (p->ping_from.ping_sockaddr);
int n, rc;
icmphdr_t *icmp;
struct ip *ip;
int dupflag;
n = recvfrom (p->ping_fd,
(char *) p->ping_buffer, _PING_BUFLEN (p, USE_IPV6), 0,
(struct sockaddr *) &p->ping_from.ping_sockaddr, &fromlen);
if (n < 0)
return -1;
rc = icmp_generic_decode (p->ping_buffer, n, &ip, &icmp);
if (rc < 0)
{
/*FIXME: conditional */
fprintf (stderr, "packet too short (%d bytes) from %s\n", n, inet_ntoa (p->ping_from.ping_sockaddr.sin_addr));
return -1;
}
switch (icmp->icmp_type)
{
case ICMP_ECHOREPLY:
case ICMP_TIMESTAMPREPLY:
case ICMP_ADDRESSREPLY:
/* case ICMP_ROUTERADV: */
if (icmp->icmp_id != p->ping_ident)
return -1;
if (rc)
fprintf (stderr, "checksum mismatch from %s\n", inet_ntoa (p->ping_from.ping_sockaddr.sin_addr));
p->ping_num_recv++;
if (_PING_TST (p, icmp->icmp_seq))
{
p->ping_num_rept++;
p->ping_num_recv--;
dupflag = 1;
}
else
{
_PING_SET (p, icmp->icmp_seq);
dupflag = 0;
}
if (p->ping_event.handler)
(*p->ping_event.handler) (dupflag ? PEV_DUPLICATE : PEV_RESPONSE,
p->ping_closure,
&p->ping_dest.ping_sockaddr, &p->ping_from.ping_sockaddr, ip, icmp, n);
break;
case ICMP_ECHO:
case ICMP_TIMESTAMP:
case ICMP_ADDRESS:
return -1;
default:
if (!my_echo_reply (p, icmp))
return -1;
if (p->ping_event.handler)
(*p->ping_event.handler) (PEV_NOECHO,
p->ping_closure,
&p->ping_dest.ping_sockaddr, &p->ping_from.ping_sockaddr, ip, icmp, n);
}
return 0;
}
static int
ping_recv (PING * p)
{
int dupflag, n;
int hops = -1;
struct msghdr msg;
struct iovec iov;
struct icmp6_hdr *icmp6;
struct cmsghdr *cmsg;
char cmsg_data[1024];
iov.iov_base = p->ping_buffer;
iov.iov_len = _PING_BUFLEN (p, USE_IPV6);
msg.msg_name = &p->ping_from.ping_sockaddr6;
msg.msg_namelen = sizeof (p->ping_from.ping_sockaddr6);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = cmsg_data;
msg.msg_controllen = sizeof (cmsg_data);
msg.msg_flags = 0;
n = recvmsg (p->ping_fd, &msg, 0);
if (n < 0)
return -1;
for (cmsg = CMSG_FIRSTHDR (&msg); cmsg; cmsg = CMSG_NXTHDR (&msg, cmsg))
{
if (cmsg->cmsg_level == IPPROTO_IPV6
&& cmsg->cmsg_type == IPV6_HOPLIMIT)
{
hops = *(int *) CMSG_DATA (cmsg);
break;
}
}
icmp6 = (struct icmp6_hdr *) p->ping_buffer;
if (icmp6->icmp6_type == ICMP6_ECHO_REPLY)
{
/* We got an echo reply. */
if (ntohs (icmp6->icmp6_id) != p->ping_ident)
return -1; /* It's not a response to us. */
if (_PING_TST (p, ntohs (icmp6->icmp6_seq)))
{
/* We already got the reply for this echo request. */
p->ping_num_rept++;
dupflag = 1;
}
else
{
_PING_SET (p, ntohs (icmp6->icmp6_seq));
p->ping_num_recv++;
dupflag = 0;
}
print_echo (dupflag, hops, p->ping_closure, &p->ping_dest.ping_sockaddr6,
&p->ping_from.ping_sockaddr6, icmp6, n);
}
else
{
/* We got an error reply. */
if (!my_echo_reply (p, icmp6))
return -1; /* It's not for us. */
print_icmp_error (&p->ping_from.ping_sockaddr6, icmp6, n);
}
return 0;
}