void
got_one(void)
{
struct sockaddr_in from;
struct ether_addr hfrom;
struct in_addr ifrom;
ssize_t result;
if ((result = receive_packet(&from, &hfrom)) == -1) {
warning("receive_packet failed on %s: %s", ifi->name,
strerror(errno));
ifi->errors++;
if ((!interface_status(ifi->name)) ||
(ifi->noifmedia && ifi->errors > 20)) {
/* our interface has gone away. */
error("Interface %s no longer appears valid.",
ifi->name);
}
return;
}
if (result == 0)
return;
ifrom.s_addr = from.sin_addr.s_addr;
do_packet(from.sin_port, ifrom, &hfrom);
}
void receive_packet(unsigned int index, unsigned char *packet, unsigned int len, unsigned int from_port, struct iaddr *from, bool was_unicast)
{
assert(packet);
assert(from);
assert(from->len == 4 || from->len == 16);
bool found = false;
unsigned int i = 0;
struct interface_info *info;
for (info = interfaces; info; info = info->next) {
if (i == index) {
found = true;
break;
}
++i;
}
if (!found) return;
if (from->len == 4) {
do_packet(info, (struct dhcp_packet *)packet, len, from_port, *from, &info->hw_address);
}
else if (from->len == 16) {
isc_boolean_t was_unicast_isc = was_unicast ? ISC_TRUE : ISC_FALSE;
do_packet6(info, (char *)packet, len, from_port, from, was_unicast_isc);
}
}
static void my_rhandler(connection_t * cptr)
{
char buf[BUFSIZE * 2];
if (my_read(cptr, buf) <= 0)
connection_close(cptr);
else
do_packet(cptr, buf);
}
static void my_rhandler(connection_t * cptr)
{
char buf[BUFSIZE * 2];
if (!my_read(cptr, buf))
connection_close(cptr);
do_packet(buf);
}
void
got_one(struct protocol *l)
{
struct sockaddr_in from;
struct hardware hfrom;
struct iaddr ifrom;
ssize_t result;
union {
unsigned char packbuf[4095];
struct dhcp_packet packet;
} u;
struct interface_info *ip = l->local;
bzero(&u, sizeof(u));
if ((result = receive_packet(ip, u.packbuf, sizeof u,
&from, &hfrom)) == -1) {
warning("receive_packet failed on %s: %s", ip->name,
strerror(errno));
ip->errors++;
if ((!interface_status(ip)) ||
(ip->noifmedia && ip->errors > 20)) {
/* our interface has gone away. */
warning("Interface %s no longer appears valid.",
ip->name);
ip->dead = 1;
interfaces_invalidated = 1;
close(l->fd);
remove_protocol(l);
free(ip);
}
return;
}
if (result == 0)
return;
ifrom.len = 4;
memcpy(ifrom.iabuf, &from.sin_addr, ifrom.len);
do_packet(ip, &u.packet, result, from.sin_port, ifrom, &hfrom);
}
void
udpsock_handler(struct protocol *protocol)
{
int sockio;
char cbuf[256], ifname[IF_NAMESIZE];
ssize_t len;
struct udpsock *udpsock = protocol->local;
struct msghdr m;
struct cmsghdr *cm;
struct iovec iov[1];
struct sockaddr_storage ss;
struct sockaddr_in *sin4;
struct sockaddr_dl *sdl = NULL;
struct interface_info iface;
struct iaddr from, addr;
unsigned char packetbuf[4095];
struct dhcp_packet *packet = (struct dhcp_packet *)packetbuf;
struct hardware hw;
struct ifreq ifr;
struct subnet *subnet;
memset(&hw, 0, sizeof(hw));
iov[0].iov_base = packetbuf;
iov[0].iov_len = sizeof(packetbuf);
memset(&m, 0, sizeof(m));
m.msg_name = &ss;
m.msg_namelen = sizeof(ss);
m.msg_iov = iov;
m.msg_iovlen = 1;
m.msg_control = cbuf;
m.msg_controllen = sizeof(cbuf);
memset(&iface, 0, sizeof(iface));
if ((len = recvmsg(udpsock->sock, &m, 0)) < 0) {
warning("receiving a DHCP message failed: %s", strerror(errno));
return;
}
if (ss.ss_family != AF_INET) {
warning("received DHCP message is not AF_INET");
return;
}
sin4 = (struct sockaddr_in *)&ss;
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
m.msg_controllen != 0 && cm;
cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
if (cm->cmsg_level == IPPROTO_IP &&
cm->cmsg_type == IP_RECVIF)
sdl = (struct sockaddr_dl *)CMSG_DATA(cm);
}
if (sdl == NULL) {
warning("could not get the received interface by IP_RECVIF");
return;
}
if_indextoname(sdl->sdl_index, ifname);
if ((sockio = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
warning("socket creation failed: %s", strerror(errno));
return;
}
strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(sockio, SIOCGIFADDR, &ifr, sizeof(ifr)) != 0) {
warning("Failed to get address for %s: %s", ifname,
strerror(errno));
close(sockio);
return;
}
close(sockio);
if (ifr.ifr_addr.sa_family != AF_INET)
return;
iface.is_udpsock = 1;
iface.send_packet = udpsock_send_packet;
iface.wfdesc = udpsock->sock;
iface.ifp = 𝔦
iface.index = sdl->sdl_index;
iface.primary_address = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
strlcpy(iface.name, ifname, sizeof(iface.name));
addr.len = 4;
memcpy(&addr.iabuf, &iface.primary_address, addr.len);
if ((subnet = find_subnet(addr)) == NULL)
return;
iface.shared_network = subnet->shared_network ;
from.len = 4;
memcpy(&from.iabuf, &sin4->sin_addr, from.len);
do_packet(&iface, packet, len, sin4->sin_port, from, &hw);
}
static int do_stop_packet(const struct radutmp *u)
{
return do_packet(0, 0, u);
}
static int do_accton_packet(uint32_t nasaddr)
{
return do_packet(1, nasaddr, 0);
}