ipv6 cleanup
[project/mdnsd.git] / interface.c
index c84bacb..2b09ad3 100644 (file)
@@ -184,7 +184,7 @@ read_socket4(struct uloop_fd *u, unsigned int events)
 
                default:
                        fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
-                       break;
+                       return;
                }
        }
 
@@ -217,12 +217,14 @@ read_socket6(struct uloop_fd *u, unsigned int events)
        struct interface *iface = container_of(u, struct interface, fd);
        static uint8_t buffer[8 * 1024];
        struct iovec iov[1];
-       char cmsg6[CMSG_SPACE(sizeof(struct in6_pktinfo)) + 1];
+       char cmsg6[CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(sizeof(int)) + 1];
        struct cmsghdr *cmsgptr;
        struct msghdr msg;
        socklen_t len;
        struct sockaddr_in6 from;
        int flags = 0, ifindex = -1;
+       int ttl = 0;
+       struct in6_pktinfo *inp = NULL;
 
        if (u->eof) {
                interface_close(iface);
@@ -235,7 +237,7 @@ read_socket6(struct uloop_fd *u, unsigned int events)
 
        memset(&msg, 0, sizeof(msg));
        msg.msg_name = (struct sockaddr *) &from;
-       msg.msg_namelen = (iface->v6) ? (sizeof(struct sockaddr_in6)) : (sizeof(struct sockaddr_in));
+       msg.msg_namelen = sizeof(struct sockaddr_in6);
        msg.msg_iov = iov;
        msg.msg_iovlen = 1;
        msg.msg_control = &cmsg6;
@@ -249,12 +251,37 @@ read_socket6(struct uloop_fd *u, unsigned int events)
        for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
                void *c = CMSG_DATA(cmsgptr);
 
-               if (cmsgptr->cmsg_level == IPPROTO_IP && cmsgptr->cmsg_type == IP_PKTINFO)
-                       ifindex = ((struct in_pktinfo *) c)->ipi_ifindex;
-               else if (cmsgptr->cmsg_level == IPPROTO_IPV6 && cmsgptr->cmsg_type == IPV6_PKTINFO)
-                       ifindex = ((struct in6_pktinfo *) c)->ipi6_ifindex;
+               switch (cmsgptr->cmsg_type) {
+               case IPV6_PKTINFO:
+                       inp = ((struct in6_pktinfo *) c);
+                       break;
+
+               case IPV6_HOPLIMIT:
+                       ttl = (uint8_t) *((int *) c);
+                       break;
+
+               default:
+                       fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
+                       return;
+               }
        }
-       if (ifindex != iface->ifindex)
+
+       if (ttl != 255)
+               return;
+
+       if (debug > 1) {
+               char buf[256];
+
+               fprintf(stderr, "iface: %s\n", iface->name);
+               fprintf(stderr, "  v6: %d\n", iface->v6);
+               fprintf(stderr, "  multicast: %d\n", iface->multicast);
+               inet_ntop(AF_INET6, &from.sin6_addr, buf, 256);
+               fprintf(stderr, "  src %s:%d\n", buf, from.sin6_port);
+               inet_ntop(AF_INET6, &inp->ipi6_addr, buf, 256);
+               fprintf(stderr, "  dst %s\n", buf);
+       }
+
+       if (inp->ipi6_ifindex != iface->ifindex)
                fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
        else
                dns_handle_packet(iface, buffer, len, 0);
@@ -363,9 +390,10 @@ reconnect_socket4(struct uloop_timeout *timeout)
        }
 
        uloop_fd_add(&iface->fd, ULOOP_READ);
-       dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 1);
-       if (iface->multicast)
+       if (iface->multicast) {
+               dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 1);
                announce_init(iface);
+       }
 
        return;
 
@@ -381,7 +409,7 @@ reconnect_socket6(struct uloop_timeout *timeout)
        int ttl = 255;
        int yes = 1;
 
-       snprintf(mcast_addr, sizeof(mcast_addr), "%s%%%s", iface->mcast_addr, iface->name);
+       snprintf(mcast_addr, sizeof(mcast_addr), "%s%%%s", (iface->multicast) ? (iface->mcast_addr) : (iface->v6_addrs), iface->name);
        iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV6ONLY, mcast_addr, "5353");
        if (iface->fd.fd < 0) {
                fprintf(stderr, "failed to add listener %s: %s\n", mcast_addr, strerror(errno));
@@ -406,8 +434,12 @@ reconnect_socket6(struct uloop_timeout *timeout)
        }
 
        uloop_fd_add(&iface->fd, ULOOP_READ);
-       dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 1);
-       announce_init(iface);
+
+       if (iface->multicast) {
+               dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 1);
+               announce_init(iface);
+       }
+
        return;
 
 retry:
@@ -452,9 +484,9 @@ static struct interface* _interface_add(const char *name, int multicast, int v6)
 
        iface = calloc_a(sizeof(*iface),
                &name_buf, strlen(name) + 1,
-               &id_buf, strlen(name) + 3);
+               &id_buf, strlen(name) + 5);
 
-       sprintf(id_buf, "%d_%s", v6, name);
+       sprintf(id_buf, "%d_%d_%s", multicast, v6, name);
        iface->name = strcpy(name_buf, name);
        iface->id = id_buf;
        iface->ifindex = if_nametoindex(name);
@@ -493,21 +525,19 @@ int interface_add(const char *name)
                        if (cfg_proto && (cfg_proto != 4))
                                continue;
 
-                       v4 = _interface_add(name, 1, 0);
-                       if (!v4)
-                               continue;
-
-                       sa = (struct sockaddr_in *) ifa->ifa_addr;
-                       memcpy(&v4->v4_addr, &sa->sin_addr, sizeof(v4->v4_addr));
-                       inet_ntop(AF_INET, &sa->sin_addr, v4->v4_addrs, sizeof(v4->v4_addrs));
-
                        unicast = _interface_add(name, 0, 0);
                        if (!unicast)
                                continue;
-
+                       sa = (struct sockaddr_in *) ifa->ifa_addr;
                        memcpy(&unicast->v4_addr, &sa->sin_addr, sizeof(unicast->v4_addr));
                        inet_ntop(AF_INET, &sa->sin_addr, unicast->v4_addrs, sizeof(unicast->v4_addrs));
 
+                       v4 = _interface_add(name, 1, 0);
+                       if (!v4)
+                               continue;
+                       memcpy(&v4->v4_addr, &sa->sin_addr, sizeof(v4->v4_addr));
+                       inet_ntop(AF_INET, &sa->sin_addr, v4->v4_addrs, sizeof(v4->v4_addrs));
+
                        v4->peer = unicast;
                        unicast->peer = v4;
                }
@@ -523,19 +553,18 @@ int interface_add(const char *name)
                        if (memcmp(&sa6->sin6_addr, &ll_prefix, 2))
                                continue;
 
-                       v6 = _interface_add(name, 1, 1);
-                       if (!v6)
-                               continue;
-                       memcpy(&v6->v6_addr, &sa6->sin6_addr, sizeof(v6->v6_addr));
-                       inet_ntop(AF_INET6, &sa6->sin6_addr, v6->v6_addrs, sizeof(v6->v6_addrs));
-
                        unicast = _interface_add(name, 0, 1);
                        if (!unicast)
                                continue;
-
                        memcpy(&unicast->v6_addr, &sa6->sin6_addr, sizeof(unicast->v6_addr));
                        inet_ntop(AF_INET6, &sa6->sin6_addr, unicast->v6_addrs, sizeof(unicast->v6_addrs));
 
+                       v6 = _interface_add(name, 1, 1);
+                       if (!v6)
+                               continue;
+                       memcpy(&v6->v6_addr, &sa6->sin6_addr, sizeof(v6->v6_addr));
+                       inet_ntop(AF_INET6, &sa6->sin6_addr, v6->v6_addrs, sizeof(v6->v6_addrs));
+
                        v6->peer = unicast;
                        unicast->peer = v6;
                }