#include <net/if.h>
#include <netinet/ip6.h>
#include <netpacket/packet.h>
+#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <sys/socket.h>
uloop_end();
}
+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, LOG_WARNING
+ );
+}
-int main()
+int main(int argc, char **argv)
{
openlog("odhcpd", LOG_PERROR | LOG_PID, LOG_DAEMON);
- setlogmask(LOG_UPTO(LOG_WARNING));
+ int opt;
+ int log_level = LOG_INFO;
+ while ((opt = getopt(argc, argv, "hl:")) != -1) {
+ switch (opt) {
+ case 'h':
+ print_usage(argv[0]);
+ return 0;
+ case 'l':
+ log_level = atoi(optarg);
+ fprintf(stderr, "Log level set to %d\n", log_level);
+ break;
+ }
+ }
+ setlogmask(LOG_UPTO(log_level));
uloop_init();
if (getuid() != 0) {
}
-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)
-{
- 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_STALE | NUD_REACHABLE | NUD_PERMANENT)))
- 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);
- }
- }
-
- }
-
- return 0;
-}
-
-
// 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)
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))
+ if (send(rtnl_socket, &req, sizeof(req), 0) < (ssize_t)sizeof(req)) {
+ syslog(LOG_WARNING, "Request failed to dump IPv6 addresses (%s)", strerror(errno));
return 0;
+ }
uint8_t buf[8192];
ssize_t len = 0, ret = 0;
if (len < 0 || !NLMSG_OK(nhm, (size_t)len)) {
if (errno == EINTR)
continue;
- else
- return ret;
+
+ syslog(LOG_WARNING, "Failed to receive IPv6 address rtnetlink message (%s)", strerror(errno));
+ ret = -1;
+ goto out;
}
}
- if (nhm->nlmsg_type != RTM_NEWADDR)
- break;
+ switch (nhm->nlmsg_type) {
+ case RTM_NEWADDR: {
+ // Skip address but keep clearing socket buffer
+ if (ret >= (ssize_t)cnt)
+ continue;
- // Skip address but keep clearing socket buffer
- if (ret >= (ssize_t)cnt)
- continue;
+ struct ifaddrmsg *ifa = NLMSG_DATA(nhm);
+ if (ifa->ifa_scope != RT_SCOPE_UNIVERSE ||
+ (ifindex && ifa->ifa_index != (unsigned)ifindex))
+ continue;
- struct ifaddrmsg *ifa = NLMSG_DATA(nhm);
- if (ifa->ifa_scope != RT_SCOPE_UNIVERSE ||
- (ifindex && ifa->ifa_index != (unsigned)ifindex))
- 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;
+ }
- 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;
+ rta = RTA_NEXT(rta, alen);
}
- rta = RTA_NEXT(rta, alen);
- }
+ if (ifa->ifa_flags & IFA_F_DEPRECATED)
+ addrs[ret].preferred = 0;
- if (ifa->ifa_flags & IFA_F_DEPRECATED)
- addrs[ret].preferred = 0;
+ ++ret;
+ break;
+ }
+ case NLMSG_DONE:
+ goto out;
+ default:
+ syslog(LOG_WARNING, "Unexpected rtnetlink message (%d) in response to IPv6 address dump", nhm->nlmsg_type);
+ ret = -1;
+ goto out;
+ }
- ++ret;
}
-
+out:
return ret;
}
-int odhcpd_get_preferred_interface_address(int ifindex, struct in6_addr *addr)
+int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr)
{
- 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;
- }
+ 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 ret;
+ close(sock);
+
+ return status;
}
void odhcpd_setup_route(const struct in6_addr *addr, int prefixlen,
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(ret);
+ }
+
while (true) {
struct iovec iov = {data_buf, sizeof(data_buf)};
struct msghdr msg = {
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");
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));
}
void odhcpd_process(struct odhcpd_event *event)
projects / project / odhcpd.git / blobdiff