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ntp: add support for IP_RECVDSTADDR and IP_SENDSRCADDR

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FreeBSD doesn't support IP_PKTINFO. Instead it provides IP_RECVDSTADDR
and IP_SENDSRCADDR, which can be used to get/set the destination/source
address.

In future IP_RECVIF and IP_SENDIF may be supported to get and set also
the interface.
This commit is contained in:
Miroslav Lichvar 2018-08-30 11:15:11 +02:00
parent 5fc7674e36
commit 0adc8e8f92
1 changed files with 27 additions and 6 deletions
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33
ntp_io.c
View file

@ -231,11 +231,11 @@ prepare_socket(int family, int port_number, int client_only)
if (family == AF_INET) {
#ifdef HAVE_IN_PKTINFO
/* We want the local IP info on server sockets */
if (setsockopt(sock_fd, IPPROTO_IP, IP_PKTINFO, (char *)&on_off, sizeof(on_off)) < 0) {
if (setsockopt(sock_fd, IPPROTO_IP, IP_PKTINFO, (char *)&on_off, sizeof(on_off)) < 0)
LOG(LOGS_ERR, "Could not set %s socket option", "IP_PKTINFO");
/* Don't quit - we might survive anyway */
}
#elif defined(IP_RECVDSTADDR)
if (setsockopt(sock_fd, IPPROTO_IP, IP_RECVDSTADDR, (char *)&on_off, sizeof(on_off)) < 0)
LOG(LOGS_ERR, "Could not set %s socket option", "IP_RECVDSTADDR");
#endif
}
#ifdef FEAT_IPV6
@ -642,6 +642,14 @@ process_message(struct msghdr *hdr, int length, int sock_fd)
local_addr.ip_addr.family = IPADDR_INET4;
local_addr.if_index = ipi.ipi_ifindex;
}
#elif defined(IP_RECVDSTADDR)
if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == IP_RECVDSTADDR) {
struct in_addr addr;
memcpy(&addr, CMSG_DATA(cmsg), sizeof (addr));
local_addr.ip_addr.addr.in4 = ntohl(addr.s_addr);
local_addr.ip_addr.family = IPADDR_INET4;
}
#endif
#ifdef HAVE_IN6_PKTINFO
@ -813,8 +821,8 @@ NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,
msg.msg_flags = 0;
cmsglen = 0;
#ifdef HAVE_IN_PKTINFO
if (local_addr->ip_addr.family == IPADDR_INET4) {
#ifdef HAVE_IN_PKTINFO
struct in_pktinfo *ipi;
cmsg = CMSG_FIRSTHDR(&msg);
@ -829,8 +837,21 @@ NIO_SendPacket(NTP_Packet *packet, NTP_Remote_Address *remote_addr,
ipi->ipi_spec_dst.s_addr = htonl(local_addr->ip_addr.addr.in4);
if (local_addr->if_index != INVALID_IF_INDEX)
ipi->ipi_ifindex = local_addr->if_index;
}
#elif defined(IP_SENDSRCADDR)
struct in_addr *addr;
cmsg = CMSG_FIRSTHDR(&msg);
memset(cmsg, 0, CMSG_SPACE(sizeof (struct in_addr)));
cmsglen += CMSG_SPACE(sizeof (struct in_addr));
cmsg->cmsg_level = IPPROTO_IP;
cmsg->cmsg_type = IP_SENDSRCADDR;
cmsg->cmsg_len = CMSG_LEN(sizeof (struct in_addr));
addr = (struct in_addr *)CMSG_DATA(cmsg);
addr->s_addr = htonl(local_addr->ip_addr.addr.in4);
#endif
}
#ifdef HAVE_IN6_PKTINFO
if (local_addr->ip_addr.family == IPADDR_INET6) {