#include <unistd.h>
#include <signal.h>
#include <stdbool.h>
+#include <syslog.h>
+#include <alloca.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/ip6.h>
#include <netpacket/packet.h>
-#include <linux/rtnetlink.h>
+#include <linux/netlink.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
static int ioctl_sock;
-static int rtnl_socket = -1;
-static int rtnl_seq = 0;
static int urandom_fd = -1;
-
static void sighandler(_unused int signal)
{
uloop_end();
}
-int main()
+static void print_usage(const char *app)
+{
+ printf(
+ "== %s Usage ==\n\n"
+ " -h, --help Print this help\n"
+ " -l level Specify log level 0..7 (default %d)\n",
+ app, config.log_level
+ );
+}
+
+
+int main(int argc, char **argv)
{
openlog("odhcpd", LOG_PERROR | LOG_PID, LOG_DAEMON);
- setlogmask(LOG_UPTO(LOG_WARNING));
+ int opt;
+
+ while ((opt = getopt(argc, argv, "hl:")) != -1) {
+ switch (opt) {
+ case 'h':
+ print_usage(argv[0]);
+ return 0;
+ case 'l':
+ config.log_level = (atoi(optarg) & LOG_PRIMASK);
+ fprintf(stderr, "Log level set to %d\n", config.log_level);
+ break;
+ }
+ }
+ setlogmask(LOG_UPTO(config.log_level));
uloop_init();
if (getuid() != 0) {
ioctl_sock = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0);
- if ((rtnl_socket = odhcpd_open_rtnl()) < 0) {
- syslog(LOG_ERR, "Unable to open socket: %s", strerror(errno));
- return 2;
- }
-
if ((urandom_fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC)) < 0)
return 4;
signal(SIGINT, sighandler);
signal(SIGTERM, sighandler);
- if (init_router())
+ if (netlink_init())
+ return 4;
+
+ if (router_init())
return 4;
- if (init_dhcpv6())
+ if (dhcpv6_init())
return 4;
- if (init_ndp())
+ if (ndp_init())
return 4;
- if (init_dhcpv4())
+#ifdef DHCPV4_SUPPORT
+ if (dhcpv4_init())
return 4;
+#endif
odhcpd_run();
return 0;
}
-int odhcpd_open_rtnl(void)
-{
- int sock = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE);
-
- // Connect to the kernel netlink interface
- struct sockaddr_nl nl = {.nl_family = AF_NETLINK};
- if (connect(sock, (struct sockaddr*)&nl, sizeof(nl))) {
- syslog(LOG_ERR, "Failed to connect to kernel rtnetlink: %s",
- strerror(errno));
- return -1;
- }
-
- return sock;
-}
-
// Read IPv6 MTU for interface
int odhcpd_get_interface_config(const char *ifname, const char *what)
int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6])
{
struct ifreq ifr;
+
memset(&ifr, 0, sizeof(ifr));
- strncpy(ifr.ifr_name, iface->ifname, sizeof(ifr.ifr_name));
+ strncpy(ifr.ifr_name, iface->ifname, sizeof(ifr.ifr_name) - 1);
if (ioctl(ioctl_sock, SIOCGIFHWADDR, &ifr) < 0)
return -1;
+
memcpy(mac, ifr.ifr_hwaddr.sa_data, 6);
return 0;
}
|| IN6_IS_ADDR_MC_LINKLOCAL(&dest->sin6_addr))
dest->sin6_scope_id = iface->ifindex;
- // IPV6_PKTINFO doesn't really work for IPv6-raw sockets (bug?)
- if (dest->sin6_port == 0) {
- msg.msg_control = NULL;
- msg.msg_controllen = 0;
- }
-
char ipbuf[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, &dest->sin6_addr, ipbuf, sizeof(ipbuf));
ssize_t sent = sendmsg(socket, &msg, MSG_DONTWAIT);
if (sent < 0)
- syslog(LOG_NOTICE, "Failed to send to %s%%%s (%s)",
- ipbuf, iface->ifname, strerror(errno));
+ syslog(LOG_NOTICE, "Failed to send to %s%%%s (%m)",
+ ipbuf, iface->ifname);
else
syslog(LOG_DEBUG, "Sent %li bytes to %s%%%s",
(long)sent, ipbuf, iface->ifname);
}
-int odhcpd_iterate_interface_neighbors(const struct interface *iface,
- void(*cb_neigh)(const struct in6_addr *addr,
- const struct interface *iface, void *data), void *data)
+static int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr)
{
- struct {
- struct nlmsghdr nhm;
- struct ndmsg ndm;
- } req = {{sizeof(req), RTM_GETNEIGH, NLM_F_REQUEST | NLM_F_DUMP,
- ++rtnl_seq, 0}, {AF_INET6, 0, 0, iface->ifindex, 0, 0, 0}};
-
- if (send(rtnl_socket, &req, sizeof(req), 0) < (ssize_t)sizeof(req))
- return -1;
-
- uint8_t buf[8192];
- ssize_t len = 0;
-
- for (struct nlmsghdr *nhm = NULL; ; nhm = NLMSG_NEXT(nhm, len)) {
- while (len < 0 || !NLMSG_OK(nhm, (size_t)len)) {
- len = recv(rtnl_socket, buf, sizeof(buf), 0);
- nhm = (struct nlmsghdr*)buf;
- if (len < 0 || !NLMSG_OK(nhm, (size_t)len)) {
- if (errno == EINTR)
- continue;
- else
- return -1;
- }
- }
-
- if (nhm->nlmsg_type != RTM_NEWNEIGH)
- break;
-
- struct ndmsg *ndm = NLMSG_DATA(nhm);
- if (ndm->ndm_ifindex != iface->ifindex ||
- (ndm->ndm_state & NUD_FAILED))
- continue;
-
- struct rtattr *rta = (struct rtattr*)&ndm[1];
- size_t alen = NLMSG_PAYLOAD(nhm, sizeof(*ndm));
-
- while (RTA_OK(rta, alen)) {
- if (rta->rta_type == NDA_DST &&
- RTA_PAYLOAD(rta) == sizeof(struct in6_addr)) {
- cb_neigh(RTA_DATA(rta), iface, data);
- break;
- } else {
- rta = RTA_NEXT(rta, alen);
- }
- }
-
+ int status = -1;
+ struct sockaddr_in6 addr = {AF_INET6, 0, 0, ALL_IPV6_ROUTERS, ifindex};
+ socklen_t alen = sizeof(addr);
+ int sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
+
+ if (!connect(sock, (struct sockaddr*)&addr, sizeof(addr)) &&
+ !getsockname(sock, (struct sockaddr*)&addr, &alen)) {
+ *lladdr = addr.sin6_addr;
+ status = 0;
}
- return 0;
-}
+ close(sock);
+ return status;
+}
-// Detect an IPV6-address currently assigned to the given interface
-ssize_t odhcpd_get_interface_addresses(int ifindex,
- struct odhcpd_ipaddr *addrs, size_t cnt)
+/*
+ * DNS address selection criteria order :
+ * - use IPv6 address with valid lifetime if none is yet selected
+ * - use IPv6 address with a preferred lifetime if the already selected IPv6 address is deprecated
+ * - use an IPv6 ULA address if the already selected IPv6 address is not an ULA address
+ * - use the IPv6 address with the longest preferred lifetime
+ */
+int odhcpd_get_interface_dns_addr(const struct interface *iface, struct in6_addr *addr)
{
- struct {
- struct nlmsghdr nhm;
- struct ifaddrmsg ifa;
- } req = {{sizeof(req), RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP,
- ++rtnl_seq, 0}, {AF_INET6, 0, 0, 0, ifindex}};
- if (send(rtnl_socket, &req, sizeof(req), 0) < (ssize_t)sizeof(req))
- return 0;
-
- uint8_t buf[8192];
- ssize_t len = 0, ret = 0;
+ time_t now = odhcpd_time();
+ ssize_t m = -1;
- for (struct nlmsghdr *nhm = NULL; ; nhm = NLMSG_NEXT(nhm, len)) {
- while (len < 0 || !NLMSG_OK(nhm, (size_t)len)) {
- len = recv(rtnl_socket, buf, sizeof(buf), 0);
- nhm = (struct nlmsghdr*)buf;
- if (len < 0 || !NLMSG_OK(nhm, (size_t)len)) {
- if (errno == EINTR)
- continue;
- else
- return ret;
- }
- }
-
- if (nhm->nlmsg_type != RTM_NEWADDR)
- break;
+ for (size_t i = 0; i < iface->addr6_len; ++i) {
+ if (iface->addr6[i].valid <= (uint32_t)now)
+ continue;
- // Skip address but keep clearing socket buffer
- if (ret >= (ssize_t)cnt)
+ if (m < 0) {
+ m = i;
continue;
+ }
- struct ifaddrmsg *ifa = NLMSG_DATA(nhm);
- if (ifa->ifa_scope != RT_SCOPE_UNIVERSE ||
- (ifindex && ifa->ifa_index != (unsigned)ifindex))
+ if (iface->addr6[m].preferred >= (uint32_t)now &&
+ iface->addr6[i].preferred < (uint32_t)now)
continue;
- struct rtattr *rta = (struct rtattr*)&ifa[1];
- size_t alen = NLMSG_PAYLOAD(nhm, sizeof(*ifa));
- memset(&addrs[ret], 0, sizeof(addrs[ret]));
- addrs[ret].prefix = ifa->ifa_prefixlen;
-
- while (RTA_OK(rta, alen)) {
- if (rta->rta_type == IFA_ADDRESS) {
- memcpy(&addrs[ret].addr, RTA_DATA(rta),
- sizeof(struct in6_addr));
- } else if (rta->rta_type == IFA_CACHEINFO) {
- struct ifa_cacheinfo *ifc = RTA_DATA(rta);
- addrs[ret].preferred = ifc->ifa_prefered;
- addrs[ret].valid = ifc->ifa_valid;
+ if (IN6_IS_ADDR_ULA(&iface->addr6[i].addr.in6)) {
+ if (!IN6_IS_ADDR_ULA(&iface->addr6[m].addr.in6)) {
+ m = i;
+ continue;
}
+ } else if (IN6_IS_ADDR_ULA(&iface->addr6[m].addr.in6))
+ continue;
- rta = RTA_NEXT(rta, alen);
- }
-
- if (ifa->ifa_flags & IFA_F_DEPRECATED)
- addrs[ret].preferred = 0;
-
- ++ret;
+ if (iface->addr6[i].preferred > iface->addr6[m].preferred)
+ m = i;
}
- return ret;
-}
-
-int odhcpd_get_preferred_interface_address(int ifindex, struct in6_addr *addr)
-{
- struct odhcpd_ipaddr ipaddrs[8];
- ssize_t ip_cnt = odhcpd_get_interface_addresses(ifindex, ipaddrs, ARRAY_SIZE(ipaddrs));
- uint32_t preferred = 0;
- int ret = 0;
-
- for (ssize_t i = 0; i < ip_cnt; i++) {
- struct odhcpd_ipaddr *ipaddr = &ipaddrs[i];
-
- if (ipaddr->preferred > preferred || !preferred) {
- preferred = ipaddr->preferred;
- *addr = ipaddr->addr;
- ret = 1;
- }
+ if (m >= 0) {
+ *addr = iface->addr6[m].addr.in6;
+ return 0;
}
- return ret;
+ return odhcpd_get_linklocal_interface_address(iface->ifindex, addr);
}
struct interface* odhcpd_get_interface_by_index(int ifindex)
{
struct odhcpd_event *e = container_of(u, struct odhcpd_event, uloop);
- uint8_t data_buf[RELAYD_BUFFER_SIZE], cmsg_buf[128];
+ uint8_t data_buf[8192], cmsg_buf[128];
union {
struct sockaddr_in6 in6;
struct sockaddr_in in;
struct sockaddr_nl nl;
} addr;
+ if (u->error) {
+ int ret = -1;
+ socklen_t ret_len = sizeof(ret);
+ getsockopt(u->fd, SOL_SOCKET, SO_ERROR, &ret, &ret_len);
+ u->error = false;
+ if (e->handle_error)
+ e->handle_error(e, ret);
+ }
+
+ if (e->recv_msgs) {
+ e->recv_msgs(e);
+ return;
+ }
+
while (true) {
struct iovec iov = {data_buf, sizeof(data_buf)};
struct msghdr msg = {
if (addr.ll.sll_family == AF_PACKET)
destiface = addr.ll.sll_ifindex;
- struct interface *iface =
- odhcpd_get_interface_by_index(destiface);
-
- if (!iface && addr.nl.nl_family != AF_NETLINK)
- continue;
-
char ipbuf[INET6_ADDRSTRLEN] = "kernel";
if (addr.ll.sll_family == AF_PACKET &&
len >= (ssize_t)sizeof(struct ip6_hdr))
else if (addr.in.sin_family == AF_INET)
inet_ntop(AF_INET, &addr.in.sin_addr, ipbuf, sizeof(ipbuf));
- syslog(LOG_DEBUG, "--");
- syslog(LOG_DEBUG, "Received %li Bytes from %s%%%s", (long)len,
- ipbuf, (iface) ? iface->ifname : "netlink");
+ // From netlink
+ if (addr.nl.nl_family == AF_NETLINK) {
+ syslog(LOG_DEBUG, "Received %li Bytes from %s%%%s", (long)len,
+ ipbuf, "netlink");
+ e->handle_dgram(&addr, data_buf, len, NULL, dest);
+ return;
+ } else if (destiface != 0) {
+ struct interface *iface;
+ list_for_each_entry(iface, &interfaces, head) {
+ if (iface->ifindex != destiface)
+ continue;
+
+ syslog(LOG_DEBUG, "Received %li Bytes from %s%%%s", (long)len,
+ ipbuf, iface->ifname);
+
+ e->handle_dgram(&addr, data_buf, len, iface, dest);
+ }
+ }
+
- e->handle_dgram(&addr, data_buf, len, iface, dest);
}
}
int odhcpd_register(struct odhcpd_event *event)
{
event->uloop.cb = odhcpd_receive_packets;
- return uloop_fd_add(&event->uloop, ULOOP_READ);
+ return uloop_fd_add(&event->uloop, ULOOP_READ |
+ ((event->handle_error) ? ULOOP_ERROR_CB : 0));
+}
+
+int odhcpd_deregister(struct odhcpd_event *event)
+{
+ event->uloop.cb = NULL;
+ return uloop_fd_delete(&event->uloop);
}
void odhcpd_process(struct odhcpd_event *event)
*dst = 0;
}
+const char *odhcpd_print_mac(const uint8_t *mac, const size_t len)
+{
+ static char buf[32];
+
+ snprintf(buf, sizeof(buf), "%02x", mac[0]);
+ for (size_t i = 1, j = 2; i < len && j < sizeof(buf); i++, j += 3)
+ snprintf(buf + j, sizeof(buf) - j, ":%02x", mac[i]);
+
+ return buf;
+}
int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits)
{
a[bytes] = (a[bytes] & mask) | ((~mask) & b[bytes]);
}
}
+
+
+int odhcpd_netmask2bitlen(bool inet6, void *mask)
+{
+ int bits;
+ struct in_addr *v4;
+ struct in6_addr *v6;
+
+ if (inet6)
+ for (bits = 0, v6 = mask;
+ bits < 128 && (v6->s6_addr[bits / 8] << (bits % 8)) & 128;
+ bits++);
+ else
+ for (bits = 0, v4 = mask;
+ bits < 32 && (ntohl(v4->s_addr) << bits) & 0x80000000;
+ bits++);
+
+ return bits;
+}
+
+bool odhcpd_bitlen2netmask(bool inet6, unsigned int bits, void *mask)
+{
+ uint8_t b;
+ struct in_addr *v4;
+ struct in6_addr *v6;
+
+ if (inet6)
+ {
+ if (bits > 128)
+ return false;
+
+ v6 = mask;
+
+ for (unsigned int i = 0; i < sizeof(v6->s6_addr); i++)
+ {
+ b = (bits > 8) ? 8 : bits;
+ v6->s6_addr[i] = (uint8_t)(0xFF << (8 - b));
+ bits -= b;
+ }
+ }
+ else
+ {
+ if (bits > 32)
+ return false;
+
+ v4 = mask;
+ v4->s_addr = bits ? htonl(~((1 << (32 - bits)) - 1)) : 0;
+ }
+
+ return true;
+}
projects / project / odhcpd.git / blobdiff