* GNU General Public License for more details.
*/
+#define _GNU_SOURCE
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <net/if.h>
-#include <linux/sockios.h>
+#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
+#include <libubox/usock.h>
+#include <libubox/uloop.h>
#include <libubox/avl-cmp.h>
#include <libubox/utils.h>
#include "interface.h"
#include "util.h"
#include "dns.h"
+#include "announce.h"
-struct interface *cur_iface = NULL;
-
-int
-interface_send_packet(struct interface *iface, struct iovec *iov, int iov_len)
+static int
+interface_send_packet4(struct interface *iface, struct iovec *iov, int iov_len)
{
static size_t cmsg_data[( CMSG_SPACE(sizeof(struct in_pktinfo)) / sizeof(size_t)) + 1];
- static struct sockaddr_in a = {
- .sin_family = AF_INET,
- .sin_port = htons(MCAST_PORT),
- };
+ static struct sockaddr_in a;
static struct msghdr m = {
.msg_name = (struct sockaddr *) &a,
.msg_namelen = sizeof(a),
struct cmsghdr *cmsg;
int fd = iface->fd.fd;
+ a.sin_family = AF_INET;
+ a.sin_port = htons(MCAST_PORT);
m.msg_iov = iov;
m.msg_iovlen = iov_len;
return sendmsg(fd, &m, 0);
}
-static void interface_free(struct interface *iface)
+static int
+interface_send_packet6(struct interface *iface, struct iovec *iov, int iov_len)
{
- if (cur_iface == iface)
- cur_iface = NULL;
+ static size_t cmsg_data[( CMSG_SPACE(sizeof(struct in6_pktinfo)) / sizeof(size_t)) + 1];
+ static struct sockaddr_in6 a;
+ static struct msghdr m = {
+ .msg_name = (struct sockaddr *) &a,
+ .msg_namelen = sizeof(a),
+ .msg_control = cmsg_data,
+ .msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)),
+ };
+ struct in6_pktinfo *pkti;
+ struct cmsghdr *cmsg;
+ int fd = iface->fd.fd;
- if (iface->fd.fd >= 0) {
- uloop_fd_delete(&iface->fd);
- close(iface->fd.fd);
- }
- free(iface);
+ a.sin6_family = AF_INET6;
+ a.sin6_port = htons(MCAST_PORT);
+ m.msg_iov = iov;
+ m.msg_iovlen = iov_len;
+
+ memset(cmsg_data, 0, sizeof(cmsg_data));
+ cmsg = CMSG_FIRSTHDR(&m);
+ cmsg->cmsg_len = m.msg_controllen;
+ cmsg->cmsg_level = IPPROTO_IPV6;
+ cmsg->cmsg_type = IPV6_PKTINFO;
+
+ pkti = (struct in6_pktinfo*) CMSG_DATA(cmsg);
+ pkti->ipi6_ifindex = iface->ifindex;
+
+ inet_pton(AF_INET6, MCAST_ADDR6, &a.sin6_addr);
+
+ return sendmsg(fd, &m, 0);
}
-static void interface_start(struct interface *iface)
+int
+interface_send_packet(struct interface *iface, struct iovec *iov, int iov_len)
{
- cur_iface = iface;
+ if (iface->v6)
+ return interface_send_packet6(iface, iov, iov_len);
+
+ return interface_send_packet4(iface, iov, iov_len);
}
-static void
-iface_update_cb(struct vlist_tree *tree, struct vlist_node *node_new,
- struct vlist_node *node_old)
+static void interface_close(struct interface *iface)
{
- struct interface *iface;
+ if (iface->fd.fd < 0)
+ return;
- if (node_old) {
- iface = container_of(node_old, struct interface, node);
- interface_free(iface);
+ announce_free(iface);
+ uloop_fd_delete(&iface->fd);
+ close(iface->fd.fd);
+ iface->fd.fd = -1;
+}
+
+static void interface_free(struct interface *iface)
+{
+ interface_close(iface);
+ free(iface);
+}
+
+static void
+read_socket(struct uloop_fd *u, unsigned int events)
+{
+ struct interface *iface = container_of(u, struct interface, fd);
+ static uint8_t buffer[8 * 1024];
+ int len;
+
+ if (u->eof) {
+ interface_close(iface);
+ uloop_timeout_set(&iface->reconnect, 1000);
+ return;
}
- if (node_new) {
- iface = container_of(node_new, struct interface, node);
- interface_start(iface);
+ len = read(u->fd, buffer, sizeof(buffer));
+ if (len < 1) {
+ if (errno != EAGAIN)
+ fprintf(stderr, "read failed: %s\n", strerror(errno));
+ return;
}
+
+ dns_handle_packet(iface, buffer, len);
}
-int interface_socket_setup(struct interface *iface)
+static int
+interface_socket_setup4(struct interface *iface)
{
struct ip_mreqn mreq;
uint8_t ttl = 255;
int yes = 1;
int no = 0;
struct sockaddr_in sa = { 0 };
- struct in_addr in;
int fd = iface->fd.fd;
- inet_aton(iface->ip, &in);
-
sa.sin_family = AF_INET;
sa.sin_port = htons(MCAST_PORT);
inet_pton(AF_INET, MCAST_ADDR, &sa.sin_addr);
memset(&mreq, 0, sizeof(mreq));
- mreq.imr_address.s_addr = in.s_addr;
+ mreq.imr_address.s_addr = iface->v4_addr.s_addr;
mreq.imr_multiaddr = sa.sin_addr;
mreq.imr_ifindex = iface->ifindex;
return 0;
}
-static const char*
-get_iface_ipv4(const char *ifname)
+static int
+interface_socket_setup6(struct interface *iface)
{
- static char buffer[INET_ADDRSTRLEN];
+ struct ipv6_mreq mreq;
+ int ttl = 255;
+ int yes = 1;
+ int no = 0;
+ struct sockaddr_in6 sa = { 0 };
+ int fd = iface->fd.fd;
+
+ sa.sin6_family = AF_INET6;
+ sa.sin6_port = htons(MCAST_PORT);
+ inet_pton(AF_INET6, MCAST_ADDR6, &sa.sin6_addr);
+
+ memset(&mreq, 0, sizeof(mreq));
+ mreq.ipv6mr_multiaddr = sa.sin6_addr;
+ mreq.ipv6mr_interface = iface->ifindex;
+
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
+ fprintf(stderr, "ioctl failed: IPV6_MULTICAST_HOPS\n");
+
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) < 0)
+ fprintf(stderr, "ioctl failed: IPV6_UNICAST_HOPS\n");
+
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
+ fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
+
+ setsockopt(fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, sizeof(mreq));
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
+ fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
+ close(fd);
+ fd = -1;
+ return -1;
+ }
+
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0)
+ fprintf(stderr, "ioctl failed: IPV6_RECVPKTINFO\n");
+
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &yes, sizeof(yes)) < 0)
+ fprintf(stderr, "ioctl failed: IPV6_RECVHOPLIMIT\n");
+
+ if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &no, sizeof(no)) < 0)
+ fprintf(stderr, "ioctl failed: IPV6_MULTICAST_LOOP\n");
+
+ return 0;
+}
+
+static void
+reconnect_socket(struct uloop_timeout *timeout)
+{
+ struct interface *iface = container_of(timeout, struct interface, reconnect);
+ char mcast_addr[16];
+ int type = 0;
+
+ if (iface->v6) {
+ snprintf(mcast_addr, sizeof(mcast_addr), "%s%%%s", iface->mcast_addr, iface->name);
+ type = USOCK_IPV6ONLY;
+ } else {
+ snprintf(mcast_addr, sizeof(mcast_addr), "%s", iface->mcast_addr);
+ type = USOCK_IPV4ONLY;
+ }
+
+ iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | type, mcast_addr, "5353");
+ if (iface->fd.fd < 0) {
+ fprintf(stderr, "failed to add listener %s: %s\n", mcast_addr, strerror(errno));
+ goto retry;
+ }
+
+ if (!iface->v6 && interface_socket_setup4(iface)) {
+ iface->fd.fd = -1;
+ goto retry;
+ }
+
+ if (iface->v6 && interface_socket_setup6(iface)) {
+ iface->fd.fd = -1;
+ goto retry;
+ }
+
+ uloop_fd_add(&iface->fd, ULOOP_READ);
+ dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR);
+ announce_init(iface);
+ return;
+
+retry:
+ uloop_timeout_set(timeout, 1000);
+}
+
+
+static void interface_start(struct interface *iface)
+{
+ iface->fd.cb = read_socket;
+ iface->reconnect.cb = reconnect_socket;
+ uloop_timeout_set(&iface->reconnect, 100);
+}
+
+static void
+iface_update_cb(struct vlist_tree *tree, struct vlist_node *node_new,
+ struct vlist_node *node_old)
+{
+ struct interface *iface;
+
+ if (node_old) {
+ iface = container_of(node_old, struct interface, node);
+ interface_free(iface);
+ }
+
+ if (node_new) {
+ iface = container_of(node_new, struct interface, node);
+ interface_start(iface);
+ }
+}
+
+static int
+get_iface_ipv4(struct interface *iface)
+{
+ struct sockaddr_in *sin;
struct ifreq ir;
- const char *ret;
- int sock;
+ int sock, ret = -1;
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0)
- return NULL;
+ return -1;
memset(&ir, 0, sizeof(struct ifreq));
- strncpy(ir.ifr_name, ifname, sizeof(ir.ifr_name));
+ strncpy(ir.ifr_name, iface->name, sizeof(ir.ifr_name));
- if (ioctl(sock, SIOCGIFADDR, &ir) < 0)
- return NULL;
+ ret = ioctl(sock, SIOCGIFADDR, &ir);
+ if (ret < 0)
+ goto out;
- ret = inet_ntop(AF_INET, &((struct sockaddr_in *) &ir.ifr_addr)->sin_addr, buffer, sizeof(buffer));
+ sin = (struct sockaddr_in *) &ir.ifr_addr;
+ memcpy(&iface->v4_addr, &sin->sin_addr, sizeof(iface->v4_addr));
+ iface->mcast_addr = MCAST_ADDR;
+out:
close(sock);
+ return ret;
+}
+static int
+get_iface_ipv6(struct interface *iface)
+{
+ struct sockaddr_in6 addr = {AF_INET6, 0, iface->ifindex, IN6ADDR_ANY_INIT, 0};
+ socklen_t alen = sizeof(addr);
+ int sock, ret = -1;
+
+ addr.sin6_addr.s6_addr[0] = 0xff;
+ addr.sin6_addr.s6_addr[1] = 0x02;
+ addr.sin6_addr.s6_addr[15] = 0x01;
+
+ sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
+ connect(sock, (struct sockaddr*)&addr, sizeof(addr));
+ ret = getsockname(sock, (struct sockaddr*)&addr, &alen);
+ if (!ret) {
+ memcpy(&iface->v6_addr, &addr.sin6_addr, sizeof(iface->v6_addr));
+ iface->mcast_addr = MCAST_ADDR6;
+ iface->v6 = 1;
+ }
+ close(sock);
return ret;
}
-int interface_add(const char *name)
+static int _interface_add(const char *name, int v6)
{
struct interface *iface;
- const char *ip_str;
- char *name_buf, *ip_buf;
-
- ip_str = get_iface_ipv4(name);
- if (!ip_str)
- return -1;
+ char *name_buf;
+ char *id_buf;
iface = calloc_a(sizeof(*iface),
&name_buf, strlen(name) + 1,
- &ip_buf, strlen(ip_str) + 1);
+ &id_buf, strlen(name) + 3);
+ sprintf(id_buf, "%d_%s", v6, name);
iface->name = strcpy(name_buf, name);
- iface->ip = strcpy(ip_buf, ip_str);
+ iface->id = id_buf;
iface->ifindex = if_nametoindex(name);
iface->fd.fd = -1;
if (iface->ifindex <= 0)
goto error;
- vlist_add(&interfaces, &iface->node, name);
+ if (!v6 && get_iface_ipv4(iface))
+ goto error;
+
+ if (v6 && get_iface_ipv6(iface))
+ goto error;
+
+ vlist_add(&interfaces, &iface->node, iface->id);
return 0;
error:
return -1;
}
+int interface_add(const char *name)
+{
+ int v4 = _interface_add(name, 0);
+ int v6 = _interface_add(name, 1);
+ return v4 && v6;
+}
+
VLIST_TREE(interfaces, avl_strcmp, iface_update_cb, false, false);
projects / project / mdnsd.git / blobdiff