void dhcp_init(void)
{
#if defined(HAVE_BSD_NETWORK)
int oneopt = 1;
#endif
daemon->dhcpfd = make_fd(daemon->dhcp_server_port);
if (daemon->enable_pxe)
daemon->pxefd = make_fd(PXE_PORT);
else
daemon->pxefd = -1;
#if defined(HAVE_BSD_NETWORK)
/* When we're not using capabilities, we need to do this here before
we drop root. Also, set buffer size small, to avoid wasting
kernel buffers */
if (option_bool(OPT_NO_PING))
daemon->dhcp_icmp_fd = -1;
else if ((daemon->dhcp_icmp_fd = make_icmp_sock()) == -1 ||
setsockopt(daemon->dhcp_icmp_fd, SOL_SOCKET, SO_RCVBUF, &oneopt, sizeof(oneopt)) == -1 )
die(_("cannot create ICMP raw socket: %s."), NULL, EC_BADNET);
/* Make BPF raw send socket */
init_bpf();
#endif
}
void dhcp_init(void)
{
int fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
struct sockaddr_in saddr;
int oneopt = 1;
struct dhcp_config *configs, *cp;
if (fd == -1)
die (_("cannot create DHCP socket : %s"), NULL, EC_BADNET);
if (!fix_fd(fd) ||
#if defined(HAVE_LINUX_NETWORK)
setsockopt(fd, SOL_IP, IP_PKTINFO, &oneopt, sizeof(oneopt)) == -1 ||
#elif defined(IP_RECVIF)
setsockopt(fd, IPPROTO_IP, IP_RECVIF, &oneopt, sizeof(oneopt)) == -1 ||
#endif
setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &oneopt, sizeof(oneopt)) == -1)
die(_("failed to set options on DHCP socket: %s"), NULL, EC_BADNET);
/* When bind-interfaces is set, there might be more than one dnmsasq
instance binding port 67. That's OK if they serve different networks.
Need to set REUSEADDR to make this posible, or REUSEPORT on *BSD.
OpenBSD <= 4.0 screws up IP_RECVIF when SO_REUSEPORT is set, but
OpenBSD <= 3.9 doesn't have IP_RECVIF anyway, so we just have to elide
this for OpenBSD 4.0, if you want more than one instance on oBSD4.0, tough. */
#ifndef OpenBSD4_0
if (daemon->options & OPT_NOWILD)
{
#ifdef SO_REUSEPORT
int rc = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &oneopt, sizeof(oneopt));
#else
int rc = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &oneopt, sizeof(oneopt));
#endif
if (rc == -1)
die(_("failed to set SO_REUSE{ADDR|PORT} on DHCP socket: %s"), NULL, EC_BADNET);
}
#endif
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_port = htons(DHCP_SERVER_PORT);
saddr.sin_addr.s_addr = INADDR_ANY;
#ifdef HAVE_SOCKADDR_SA_LEN
saddr.sin_len = sizeof(struct sockaddr_in);
#endif
if (bind(fd, (struct sockaddr *)&saddr, sizeof(struct sockaddr_in)))
die(_("failed to bind DHCP server socket: %s"), NULL, EC_BADNET);
daemon->dhcpfd = fd;
#ifndef HAVE_LINUX_NETWORK
/* When we're not using capabilities, we need to do this here before
we drop root. Also, set buffer size small, to avoid wasting
kernel buffers */
if (daemon->options & OPT_NO_PING)
daemon->dhcp_icmp_fd = -1;
else if ((daemon->dhcp_icmp_fd = make_icmp_sock()) == -1 ||
setsockopt(daemon->dhcp_icmp_fd, SOL_SOCKET, SO_RCVBUF, &oneopt, sizeof(oneopt)) == -1 )
die(_("cannot create ICMP raw socket: %s."), NULL, EC_BADNET);
/* Make BPF raw send socket */
init_bpf();
#endif
/* If the same IP appears in more than one host config, then DISCOVER
for one of the hosts will get the address, but REQUEST will be NAKed,
since the address is reserved by the other one -> protocol loop.
Also check that FQDNs match the domain we are using. */
for (configs = daemon->dhcp_conf; configs; configs = configs->next)
{
char *domain;
for (cp = configs->next; cp; cp = cp->next)
if ((configs->flags & cp->flags & CONFIG_ADDR) && configs->addr.s_addr == cp->addr.s_addr)
die(_("duplicate IP address %s in dhcp-config directive."), inet_ntoa(cp->addr), EC_BADCONF);
if ((configs->flags & CONFIG_NAME) && (domain = strip_hostname(configs->hostname)))
die(_("illegal domain %s in dhcp-config directive."), domain, EC_BADCONF);
}
daemon->dhcp_packet.iov_len = sizeof(struct dhcp_packet);
daemon->dhcp_packet.iov_base = safe_malloc(daemon->dhcp_packet.iov_len);
}
void dhcp_init(void)
{
int fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
struct sockaddr_in saddr;
int oneopt = 1;
#if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
int mtu = IP_PMTUDISC_DONT;
#endif
if (fd == -1)
die (_("cannot create DHCP socket: %s"), NULL, EC_BADNET);
if (!fix_fd(fd) ||
#if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
setsockopt(fd, SOL_IP, IP_MTU_DISCOVER, &mtu, sizeof(mtu)) == -1 ||
#endif
#if defined(HAVE_LINUX_NETWORK)
setsockopt(fd, SOL_IP, IP_PKTINFO, &oneopt, sizeof(oneopt)) == -1 ||
#else
setsockopt(fd, IPPROTO_IP, IP_RECVIF, &oneopt, sizeof(oneopt)) == -1 ||
#endif
setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &oneopt, sizeof(oneopt)) == -1)
die(_("failed to set options on DHCP socket: %s"), NULL, EC_BADNET);
if (daemon->options & OPT_NOWILD)
{
#ifdef SO_REUSEPORT
int rc = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &oneopt, sizeof(oneopt));
#else
int rc = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &oneopt, sizeof(oneopt));
#endif
if (rc == -1)
die(_("failed to set SO_REUSE{ADDR|PORT} on DHCP socket: %s"), NULL, EC_BADNET);
}
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
saddr.sin_port = htons(daemon->dhcp_server_port);
saddr.sin_addr.s_addr = INADDR_ANY;
#ifdef HAVE_SOCKADDR_SA_LEN
saddr.sin_len = sizeof(struct sockaddr_in);
#endif
if (bind(fd, (struct sockaddr *)&saddr, sizeof(struct sockaddr_in)))
die(_("failed to bind DHCP server socket: %s"), NULL, EC_BADNET);
daemon->dhcpfd = fd;
#if defined(HAVE_BSD_NETWORK)
if (daemon->options & OPT_NO_PING)
daemon->dhcp_icmp_fd = -1;
else if ((daemon->dhcp_icmp_fd = make_icmp_sock()) == -1 ||
setsockopt(daemon->dhcp_icmp_fd, SOL_SOCKET, SO_RCVBUF, &oneopt, sizeof(oneopt)) == -1 )
die(_("cannot create ICMP raw socket: %s."), NULL, EC_BADNET);
init_bpf();
#endif
check_dhcp_hosts(1);
daemon->dhcp_packet.iov_len = sizeof(struct dhcp_packet);
daemon->dhcp_packet.iov_base = safe_malloc(daemon->dhcp_packet.iov_len);
}