+/*
+ discovery.c -- local network discovery
+ Copyright (C) 2014-2021 Guus Sliepen <guus@meshlink.io>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#define __APPLE_USE_RFC_3542
#include "system.h"
-#include <catta/core.h>
-#include <catta/lookup.h>
-#include <catta/publish.h>
-#include <catta/log.h>
-#include <catta/simple-watch.h>
-#include <catta/malloc.h>
-#include <catta/alternative.h>
-#include <catta/error.h>
-
-#if defined(__APPLE__) || defined(__unix) && !defined(__linux)
+#if defined(__APPLE__)
+#include <CoreFoundation/CoreFoundation.h>
+#include <CoreFoundation/CFArray.h>
+#include <CoreFoundation/CFString.h>
+#include <SystemConfiguration/SystemConfiguration.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#elif defined(__unix) && !defined(__linux)
+#include <net/if.h>
#include <net/route.h>
+#include <netinet/in.h>
+#elif defined(__linux)
+#include <asm/types.h>
+#include <net/if.h>
+#include <linux/if_link.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
#endif
+#include "mdns.h"
#include "meshlink_internal.h"
#include "event.h"
#include "discovery.h"
#include "sockaddr.h"
#include "logger.h"
+#include "netutl.h"
#include "node.h"
#include "connection.h"
+#include "utils.h"
#include "xalloc.h"
#define MESHLINK_MDNS_SERVICE_TYPE "_%s._tcp"
#define MESHLINK_MDNS_NAME_KEY "name"
#define MESHLINK_MDNS_FINGERPRINT_KEY "fingerprint"
-static void generate_rand_string(meshlink_handle_t *mesh, char *buffer, size_t size) {
- assert(size);
+#ifndef MSG_NOSIGNAL
+#define MSG_NOSIGNAL 0
+#endif
+
+#ifndef IPV6_ADD_MEMBERSHIP
+#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
+#endif
+
+#ifndef IPV6_DROP_MEMBERSHIP
+#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
+#endif
+
+static const sockaddr_t mdns_address_ipv4 = {
+ .in.sin_family = AF_INET,
+ .in.sin_addr.s_addr = 0xfb0000e0,
+ .in.sin_port = 0xe914,
+};
+
+static const sockaddr_t mdns_address_ipv6 = {
+ .in6.sin6_family = AF_INET6,
+ .in6.sin6_addr.s6_addr[0x0] = 0xff,
+ .in6.sin6_addr.s6_addr[0x1] = 0x02,
+ .in6.sin6_addr.s6_addr[0xf] = 0xfb,
+ .in6.sin6_port = 0xe914,
+};
+
+typedef struct discovery_address {
+ int index;
+ bool up;
+ sockaddr_t address;
+ time_t last_response_sent;
+} discovery_address_t;
+
+static int iface_compare(const void *va, const void *vb) {
+ const int *a = va;
+ const int *b = vb;
+ return *a - *b;
+}
- for(size_t i = 0; i < (size - 1); ++i) {
- buffer[i] = 'a' + prng(mesh, 'z' - 'a' + 1);
+static int address_compare(const void *va, const void *vb) {
+ const discovery_address_t *a = va;
+ const discovery_address_t *b = vb;
+
+ if(a->index != b->index) {
+ return a->index - b->index;
}
- buffer[size - 1] = '\0';
+ return sockaddrcmp_noport(&a->address, &b->address);
}
-static void discovery_entry_group_callback(CattaServer *server, CattaSEntryGroup *group, CattaEntryGroupState state, void *userdata) {
- (void)server;
- (void)group;
- meshlink_handle_t *mesh = userdata;
+static void send_mdns_packet_ipv4(meshlink_handle_t *mesh, int fd, int index, const sockaddr_t *src, const sockaddr_t *dest, void *data, size_t len) {
+#ifdef IP_MULTICAST_IF
+ struct ip_mreqn mreq = {
+ .imr_address = src->in.sin_addr,
+ .imr_ifindex = index,
+ };
- assert(mesh);
- assert(mesh->catta_server);
- assert(mesh->catta_poll);
-
- /* Called whenever the entry group state changes */
- switch(state) {
- case CATTA_ENTRY_GROUP_ESTABLISHED:
- /* The entry group has been established successfully */
- logger(mesh, MESHLINK_DEBUG, "Catta Service successfully established.\n");
- break;
+ if(setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, &mreq, sizeof(mreq)) != 0) {
+ logger(mesh, MESHLINK_ERROR, "Could not set outgoing multicast interface on IPv4 socket");
+ return;
+ }
- case CATTA_ENTRY_GROUP_COLLISION:
- logger(mesh, MESHLINK_WARNING, "Catta Service collision.\n");
- // @TODO can we just set a new name and retry?
- break;
+#endif
- case CATTA_ENTRY_GROUP_FAILURE :
- /* Some kind of failure happened while we were registering our services */
- logger(mesh, MESHLINK_ERROR, "Catta Entry group failure: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
- catta_simple_poll_quit(mesh->catta_poll);
- break;
+#ifdef IP_PKTINFO
+ struct iovec iov = {
+ .iov_base = data,
+ .iov_len = len,
+ };
+
+ struct in_pktinfo pkti = {
+ .ipi_ifindex = index,
+ .ipi_addr = src->in.sin_addr,
+ };
+
+ union {
+ char buf[CMSG_SPACE(sizeof(pkti))];
+ struct cmsghdr align;
+ } u;
+
+ memset(&u, 0, sizeof(u));
+
+ struct msghdr msg = {
+ .msg_name = (struct sockaddr *) &dest->sa,
+ .msg_namelen = SALEN(dest->sa),
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ .msg_control = u.buf,
+ .msg_controllen = sizeof(u.buf),
+ };
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = IPPROTO_IP;
+ cmsg->cmsg_type = IP_PKTINFO;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(pkti));
+ memcpy(CMSG_DATA(cmsg), &pkti, sizeof(pkti));
+
+ // Send the packet
+ ssize_t result = sendmsg(fd, &msg, MSG_DONTWAIT | MSG_NOSIGNAL);
+#else
+ (void)index;
+ (void)src;
+
+ // Send the packet
+ ssize_t result = sendto(fd, data, len, MSG_DONTWAIT | MSG_NOSIGNAL, &dest->sa, SALEN(dest->sa));
+#endif
- case CATTA_ENTRY_GROUP_UNCOMMITED:
- case CATTA_ENTRY_GROUP_REGISTERING:
- break;
+ if(result <= 0) {
+ logger(mesh, MESHLINK_ERROR, "Error sending multicast packet: %s", strerror(errno));
}
}
+static void send_mdns_packet_ipv6(meshlink_handle_t *mesh, int fd, int index, const sockaddr_t *src, const sockaddr_t *dest, void *data, size_t len) {
+#ifdef IPV6_MULTICAST_IF
-static void discovery_create_services(meshlink_handle_t *mesh) {
- char *fingerprint = NULL;
- char *txt_name = NULL;
- char *txt_fingerprint = NULL;
+ if(setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &index, sizeof(index)) != 0) {
+ logger(mesh, MESHLINK_ERROR, "Could not set outgoing multicast interface on IPv6 socket");
+ return;
+ }
- assert(mesh);
- assert(mesh->name);
- assert(mesh->myport);
- assert(mesh->catta_server);
- assert(mesh->catta_poll);
- assert(mesh->catta_servicetype);
- assert(mesh->self);
+#endif
- logger(mesh, MESHLINK_DEBUG, "Adding service\n");
+#ifdef IPV6_PKTINFO
+ struct iovec iov = {
+ .iov_base = data,
+ .iov_len = len,
+ };
+
+ struct in6_pktinfo pkti = {
+ .ipi6_ifindex = index,
+ .ipi6_addr = src->in6.sin6_addr,
+ };
+
+ union {
+ char buf[CMSG_SPACE(sizeof(pkti))];
+ struct cmsghdr align;
+ } u;
+
+ memset(&u, 0, sizeof u);
+
+ struct msghdr msg = {
+ .msg_name = (struct sockaddr *) &dest->sa,
+ .msg_namelen = SALEN(dest->sa),
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ .msg_control = u.buf,
+ .msg_controllen = CMSG_LEN(sizeof(pkti)),
+ };
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = IPPROTO_IPV6;
+ cmsg->cmsg_type = IPV6_PKTINFO;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(pkti));
+ memcpy(CMSG_DATA(cmsg), &pkti, sizeof(pkti));
+
+ // Send the packet
+ ssize_t result = sendmsg(fd, &msg, MSG_DONTWAIT | MSG_NOSIGNAL);
+#else
+ (void)index;
+ (void)src;
+
+ // Send the packet
+ ssize_t result = sendto(fd, data, len, MSG_DONTWAIT | MSG_NOSIGNAL, &dest->sa, SALEN(dest->sa));
+#endif
- /* Ifthis is the first time we're called, let's create a new entry group */
- if(!(mesh->catta_group = catta_s_entry_group_new(mesh->catta_server, discovery_entry_group_callback, mesh))) {
- logger(mesh, MESHLINK_ERROR, "catta_entry_group_new() failed: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
- goto fail;
+ if(result <= 0) {
+ logger(mesh, MESHLINK_ERROR, "Error sending multicast packet: %s", strerror(errno));
}
+}
- /* Create txt records */
- fingerprint = meshlink_get_fingerprint(mesh, (meshlink_node_t *)mesh->self);
- xasprintf(&txt_name, "%s=%s", MESHLINK_MDNS_NAME_KEY, mesh->name);
- xasprintf(&txt_fingerprint, "%s=%s", MESHLINK_MDNS_FINGERPRINT_KEY, fingerprint);
+static void send_mdns_packet(meshlink_handle_t *mesh, discovery_address_t *addr, bool response) {
+ // Configure the socket to send the packet to the right interface
+ uint8_t msg[1024];
+ size_t msg_size;
+
+ if(response) {
+ char *fingerprint = meshlink_get_fingerprint(mesh, (meshlink_node_t *)mesh->self);
+ static const char *keys[] = {MESHLINK_MDNS_NAME_KEY, MESHLINK_MDNS_FINGERPRINT_KEY};
+ const char *values[] = {mesh->name, fingerprint};
+ msg_size = prepare_response(msg, sizeof msg, fingerprint, mesh->appname, "tcp", atoi(mesh->myport), 2, keys, values);
+ free(fingerprint);
+ addr->last_response_sent = mesh->loop.now.tv_sec;
+ } else {
+ msg_size = prepare_request(msg, sizeof msg, mesh->appname, "tcp");
+ }
- /* Add the service */
- int ret = 0;
+ switch(addr->address.sa.sa_family) {
+ case AF_INET:
+ send_mdns_packet_ipv4(mesh, mesh->discovery.sockets[0].fd, addr->index, &addr->address, &mdns_address_ipv4, msg, msg_size);
+ break;
+
+ case AF_INET6:
+ send_mdns_packet_ipv6(mesh, mesh->discovery.sockets[1].fd, addr->index, &addr->address, &mdns_address_ipv6, msg, msg_size);
+ break;
- if((ret = catta_server_add_service(mesh->catta_server, mesh->catta_group, CATTA_IF_UNSPEC, CATTA_PROTO_UNSPEC, 0, fingerprint, mesh->catta_servicetype, NULL, NULL, atoi(mesh->myport), txt_name, txt_fingerprint, NULL)) < 0) {
- logger(mesh, MESHLINK_ERROR, "Failed to add service: %s\n", catta_strerror(ret));
- goto fail;
+ default:
+ break;
}
+}
+
+static void mdns_io_handler(event_loop_t *loop, void *data, int flags) {
+ (void)flags;
+ meshlink_handle_t *mesh = loop->data;
+ io_t *io = data;
+ uint8_t buf[1024];
+ sockaddr_t sa;
+ socklen_t sl = sizeof(sa);
+
+#ifdef IP_PKTINFO
+ struct iovec iov = {
+ .iov_base = buf,
+ .iov_len = sizeof(buf),
+ };
+
+ union {
+ char buf[1024];
+ struct cmsghdr align;
+ } u;
+
+ struct msghdr msg = {
+ .msg_name = &sa,
+ .msg_namelen = sl,
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ .msg_control = u.buf,
+ .msg_controllen = sizeof(u.buf),
+ };
+
+ ssize_t len = recvmsg(io->fd, &msg, MSG_DONTWAIT | MSG_NOSIGNAL);
+
+ sl = msg.msg_namelen;
+#else
+ ssize_t len = recvfrom(io->fd, buf, sizeof(buf), MSG_DONTWAIT, &sa.sa, &sl);
+#endif
+
+ if(len == -1) {
+ if(!sockwouldblock(errno)) {
+ logger(mesh, MESHLINK_ERROR, "Error reading from mDNS discovery socket: %s", strerror(errno));
+ io_set(loop, io, 0);
+ }
- /* Tell the server to register the service */
- if((ret = catta_s_entry_group_commit(mesh->catta_group)) < 0) {
- logger(mesh, MESHLINK_ERROR, "Failed to commit entry_group: %s\n", catta_strerror(ret));
- goto fail;
+ return;
}
- goto done;
+ char *name = NULL;
+ uint16_t port = 0;
+ const char *keys[2] = {MESHLINK_MDNS_NAME_KEY, MESHLINK_MDNS_FINGERPRINT_KEY};
+ char *values[2] = {NULL, NULL};
-fail:
- catta_simple_poll_quit(mesh->catta_poll);
+ if(parse_response(buf, len, &name, mesh->appname, "tcp", &port, 2, keys, values)) {
+ node_t *n = (node_t *)meshlink_get_node(mesh, values[0]);
-done:
- free(fingerprint);
- free(txt_name);
- free(txt_fingerprint);
-}
+ if(n) {
+ if(n != mesh->self) {
+ logger(mesh, MESHLINK_INFO, "Node %s discovered on the local network.\n", n->name);
+ }
-static void discovery_server_callback(CattaServer *server, CattaServerState state, void *userdata) {
- (void)server;
- meshlink_handle_t *mesh = userdata;
+ switch(sa.sa.sa_family) {
+ case AF_INET:
+ sa.in.sin_port = htons(port);
+ break;
- assert(mesh);
+ case AF_INET6:
+ sa.in6.sin6_port = htons(port);
+ break;
- switch(state) {
- case CATTA_SERVER_RUNNING:
+ default:
+ logger(mesh, MESHLINK_WARNING, "Could not resolve node %s to a known address family type.\n", n->name);
+ sa.sa.sa_family = AF_UNKNOWN;
+ break;
+ }
- /* The serve has startup successfully and registered its host
- * name on the network, so it's time to create our services */
- if(pthread_mutex_lock(&mesh->mutex) != 0) {
- abort();
- }
+ if(sa.sa.sa_family != AF_UNKNOWN) {
+ n->catta_address = sa;
+ n->last_connect_try = 0;
+ node_add_recent_address(mesh, n, &sa);
+
+ if(n->connection) {
+ n->connection->last_ping_time = -3600;
+ }
+
+ for list_each(outgoing_t, outgoing, mesh->outgoings) {
+ if(outgoing->node != n) {
+ continue;
+ }
+
+ outgoing->timeout = 0;
- if(!mesh->catta_group) {
- discovery_create_services(mesh);
+ if(outgoing->ev.cb) {
+ timeout_set(&mesh->loop, &outgoing->ev, &(struct timespec) {
+ 0, 0
+ });
+ }
+ }
+ }
}
+ } else if(parse_request(buf, len, mesh->appname, "tcp")) {
+ char *fingerprint = meshlink_get_fingerprint(mesh, (meshlink_node_t *)mesh->self);
+ const char *response_values[] = {mesh->name, fingerprint};
+ size_t size = prepare_response(buf, sizeof(buf), fingerprint, mesh->appname, "tcp", atoi(mesh->myport), 2, keys, response_values);
- pthread_mutex_unlock(&mesh->mutex);
+ int index = -1;
+ int family = AF_UNSPEC;
- break;
+ for(struct cmsghdr *cmptr = CMSG_FIRSTHDR(&msg); cmptr != NULL; cmptr = CMSG_NXTHDR(&msg, cmptr)) {
+#ifdef IP_PKTINFO
- case CATTA_SERVER_COLLISION: {
- /* A host name collision happened. Let's pick a new name for the server */
- char hostname[17];
- generate_rand_string(mesh, hostname, sizeof(hostname));
+ if(cmptr->cmsg_level == IPPROTO_IP && cmptr->cmsg_type == IP_PKTINFO) {
+ struct in_pktinfo *pktinfo = (struct in_pktinfo *) CMSG_DATA(cmptr);
+ index = pktinfo->ipi_ifindex;
+ family = AF_INET;
+ break;
+ } else
+#endif
+#ifdef IPV6_PKTINFO
+ if(cmptr->cmsg_level == IPPROTO_IPV6 && cmptr->cmsg_type == IPV6_PKTINFO) {
+ struct in6_pktinfo *pktinfo = (struct in6_pktinfo *) CMSG_DATA(cmptr);
+ index = pktinfo->ipi6_ifindex;
+ family = AF_INET6;
+ break;
+ }
- if(pthread_mutex_lock(&mesh->mutex) != 0) {
- abort();
+#endif
}
- assert(mesh->catta_server);
- assert(mesh->catta_poll);
+ if(index) {
+ // Send a multicast response back using all addresses matching the interface
+ for(int i = 0; i < mesh->discovery.address_count; i++) {
+ discovery_address_t *p = &mesh->discovery.addresses[i];
- int result = catta_server_set_host_name(mesh->catta_server, hostname);
-
- if(result < 0) {
- catta_simple_poll_quit(mesh->catta_poll);
+ if(p->index == index && p->address.sa.sa_family == family) {
+ send_mdns_packet(mesh, p, true);
+ }
+ }
+ } else {
+ // Send a unicast response back
+ sendto(io->fd, buf, size, MSG_DONTWAIT | MSG_NOSIGNAL, &sa.sa, sl);
}
- pthread_mutex_unlock(&mesh->mutex);
+ free(fingerprint);
}
- break;
- case CATTA_SERVER_REGISTERING:
- if(pthread_mutex_lock(&mesh->mutex) != 0) {
- abort();
- }
+ free(name);
- /* Let's drop our registered services. When the server is back
- * in CATTA_SERVER_RUNNING state we will register them
- * again with the new host name. */
- if(mesh->catta_group) {
- catta_s_entry_group_reset(mesh->catta_group);
- mesh->catta_group = NULL;
- }
+ for(int i = 0; i < 2; i++) {
+ free(values[i]);
+ }
+}
- pthread_mutex_unlock(&mesh->mutex);
+static void iface_up(meshlink_handle_t *mesh, int index) {
+ int *p = bsearch(&index, mesh->discovery.ifaces, mesh->discovery.iface_count, sizeof(*p), iface_compare);
- break;
+ if(p) {
+ return;
+ }
- case CATTA_SERVER_FAILURE:
- if(pthread_mutex_lock(&mesh->mutex) != 0) {
- abort();
- }
+ mesh->discovery.ifaces = xrealloc(mesh->discovery.ifaces, ++mesh->discovery.iface_count * sizeof(*p));
+ mesh->discovery.ifaces[mesh->discovery.iface_count - 1] = index;
+ qsort(mesh->discovery.ifaces, mesh->discovery.iface_count, sizeof(*p), iface_compare);
- assert(mesh->catta_server);
- assert(mesh->catta_poll);
+ // Add multicast membership
+ struct ip_mreqn mreq4 = {
+ .imr_multiaddr = mdns_address_ipv4.in.sin_addr,
+ .imr_ifindex = index,
+ };
- /* Terminate on failure */
- catta_simple_poll_quit(mesh->catta_poll);
+ setsockopt(mesh->discovery.sockets[0].fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq4, sizeof(mreq4));
+ setsockopt(mesh->discovery.sockets[0].fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq4, sizeof(mreq4));
- pthread_mutex_unlock(&mesh->mutex);
- break;
+ struct ipv6_mreq mreq6 = {
+ .ipv6mr_multiaddr = mdns_address_ipv6.in6.sin6_addr,
+ .ipv6mr_interface = index,
+ };
- case CATTA_SERVER_INVALID:
- break;
+ setsockopt(mesh->discovery.sockets[1].fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6));
+ setsockopt(mesh->discovery.sockets[1].fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6));
+
+ // Send an announcement for all addresses associated with this interface
+ for(int i = 0; i < mesh->discovery.address_count; i++) {
+ if(mesh->discovery.addresses[i].index == index) {
+ send_mdns_packet(mesh, &mesh->discovery.addresses[i], false);
+ }
}
+
+ handle_network_change(mesh, true);
}
-static void discovery_resolve_callback(CattaSServiceResolver *resolver, CattaIfIndex interface_, CattaProtocol protocol, CattaResolverEvent event, const char *name, const char *type, const char *domain, const char *host_name, const CattaAddress *address, uint16_t port, CattaStringList *txt, CattaLookupResultFlags flags, void *userdata) {
- (void)interface_;
- (void)protocol;
- (void)flags;
- (void)name;
- (void)type;
- (void)domain;
- (void)host_name;
+static void iface_down(meshlink_handle_t *mesh, int index) {
+ int *p = bsearch(&index, mesh->discovery.ifaces, mesh->discovery.iface_count, sizeof(*p), iface_compare);
- meshlink_handle_t *mesh = userdata;
+ if(!p) {
+ return;
+ }
- assert(mesh);
+ // Drop multicast membership
+ struct ip_mreqn mreq4 = {
+ .imr_multiaddr = mdns_address_ipv4.in.sin_addr,
+ .imr_ifindex = index,
+ };
+ setsockopt(mesh->discovery.sockets[0].fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq4, sizeof(mreq4));
- if(event != CATTA_RESOLVER_FOUND) {
- catta_s_service_resolver_free(resolver);
+ struct ipv6_mreq mreq6 = {
+ .ipv6mr_multiaddr = mdns_address_ipv6.in6.sin6_addr,
+ .ipv6mr_interface = index,
+ };
+ setsockopt(mesh->discovery.sockets[1].fd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6));
+
+ memmove(p, p + 1, (mesh->discovery.ifaces + --mesh->discovery.iface_count - p) * sizeof(*p));
+
+ handle_network_change(mesh, mesh->discovery.iface_count);
+}
+
+static void addr_add(meshlink_handle_t *mesh, const discovery_address_t *addr) {
+ discovery_address_t *p = bsearch(addr, mesh->discovery.addresses, mesh->discovery.address_count, sizeof(*p), address_compare);
+
+ if(p) {
return;
}
- // retrieve fingerprint
- CattaStringList *node_name_li = catta_string_list_find(txt, MESHLINK_MDNS_NAME_KEY);
- CattaStringList *node_fp_li = catta_string_list_find(txt, MESHLINK_MDNS_FINGERPRINT_KEY);
+ bool up = bsearch(&addr->index, mesh->discovery.ifaces, mesh->discovery.iface_count, sizeof(int), iface_compare);
- if(node_name_li && node_fp_li) {
- char *node_name = (char *)catta_string_list_get_text(node_name_li) + strlen(MESHLINK_MDNS_NAME_KEY);
- char *node_fp = (char *)catta_string_list_get_text(node_fp_li) + strlen(MESHLINK_MDNS_FINGERPRINT_KEY);
+ mesh->discovery.addresses = xrealloc(mesh->discovery.addresses, ++mesh->discovery.address_count * sizeof(*p));
+ mesh->discovery.addresses[mesh->discovery.address_count - 1] = *addr;
+ mesh->discovery.addresses[mesh->discovery.address_count - 1].up = up;
- if(node_name[0] == '=' && node_fp[0] == '=') {
- if(pthread_mutex_lock(&mesh->mutex) != 0) {
- abort();
- }
+ if(up) {
+ send_mdns_packet(mesh, &mesh->discovery.addresses[mesh->discovery.address_count - 1], false);
+ }
- node_name += 1;
+ qsort(mesh->discovery.addresses, mesh->discovery.address_count, sizeof(*p), address_compare);
+}
- meshlink_node_t *node = meshlink_get_node(mesh, node_name);
+static void addr_del(meshlink_handle_t *mesh, const discovery_address_t *addr) {
+ discovery_address_t *p = bsearch(addr, mesh->discovery.addresses, mesh->discovery.address_count, sizeof(*p), address_compare);
- if(node) {
- logger(mesh, MESHLINK_INFO, "Node %s is part of the mesh network.\n", node->name);
+ if(!p) {
+ return;
+ }
- sockaddr_t naddress;
- memset(&naddress, 0, sizeof(naddress));
+ memmove(p, p + 1, (mesh->discovery.addresses + --mesh->discovery.address_count - p) * sizeof(*p));
+}
- switch(address->proto) {
- case CATTA_PROTO_INET: {
- naddress.in.sin_family = AF_INET;
- naddress.in.sin_port = htons(port);
- naddress.in.sin_addr.s_addr = address->data.ipv4.address;
- }
- break;
+void scan_ifaddrs(meshlink_handle_t *mesh) {
+#ifdef HAVE_GETIFADDRS
+ struct ifaddrs *ifa = NULL;
- case CATTA_PROTO_INET6: {
- naddress.in6.sin6_family = AF_INET6;
- naddress.in6.sin6_port = htons(port);
- memcpy(naddress.in6.sin6_addr.s6_addr, address->data.ipv6.address, sizeof(naddress.in6.sin6_addr.s6_addr));
- }
- break;
+ if(getifaddrs(&ifa) == -1) {
+ logger(mesh, MESHLINK_ERROR, "Could not get list of interface addresses: %s", strerror(errno));
+ return;
+ }
- default:
- naddress.unknown.family = AF_UNKNOWN;
- break;
- }
+ // Check for interfaces being removed
+ for(int i = 0; i < mesh->discovery.iface_count;) {
+ bool found = false;
- if(naddress.unknown.family != AF_UNKNOWN) {
- node_t *n = (node_t *)node;
- connection_t *c = n->connection;
+ for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
+ if(!ifap->ifa_name) {
+ continue;
+ }
- n->catta_address = naddress;
- node_add_recent_address(mesh, n, &naddress);
+ int index = if_nametoindex(ifap->ifa_name);
- if(c && c->outgoing && !c->status.active) {
- c->outgoing->timeout = 0;
+ if(mesh->discovery.ifaces[i] == index) {
+ found = true;
+ break;
+ }
+ }
- if(c->outgoing->ev.cb) {
- timeout_set(&mesh->loop, &c->outgoing->ev, &(struct timespec) {
- 0, 0
- });
- }
+ if(!found) {
+ iface_down(mesh, mesh->discovery.ifaces[i]);
+ } else {
+ i++;
+ }
+ }
- c->last_ping_time = -3600;
- }
+ // Check for addresses being removed
+ for(int i = 0; i < mesh->discovery.address_count;) {
+ discovery_address_t *p = &mesh->discovery.addresses[i];
+ bool found = false;
- } else {
- logger(mesh, MESHLINK_WARNING, "Could not resolve node %s to a known address family type.\n", node->name);
- }
- } else {
- logger(mesh, MESHLINK_WARNING, "Node %s is not part of the mesh network.\n", node_name);
+ for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
+ if(!ifap->ifa_name || !ifap->ifa_addr) {
+ continue;
}
- pthread_mutex_unlock(&mesh->mutex);
+ int index = if_nametoindex(ifap->ifa_name);
+
+ if(p->index == index && sockaddrcmp_noport(&p->address, (sockaddr_t *)ifap->ifa_addr) == 0) {
+ found = true;
+ break;
+ }
+ }
+
+ if(!found) {
+ (void)addr_del;
+ memmove(p, p + 1, (mesh->discovery.addresses + --mesh->discovery.address_count - p) * sizeof(*p));
+ } else {
+ i++;
}
}
- catta_s_service_resolver_free(resolver);
-}
+ // Check for interfaces state changes and addresses going up
+ for(struct ifaddrs *ifap = ifa; ifap; ifap = ifap->ifa_next) {
+ if(!ifap->ifa_name) {
+ continue;
+ }
-static void discovery_browse_callback(CattaSServiceBrowser *browser, CattaIfIndex interface_, CattaProtocol protocol, CattaBrowserEvent event, const char *name, const char *type, const char *domain, CattaLookupResultFlags flags, void *userdata) {
- (void)browser;
- (void)flags;
- meshlink_handle_t *mesh = userdata;
+ int index = if_nametoindex(ifap->ifa_name);
- /* Called whenever a new services becomes available on the LAN or is removed from the LAN */
- switch(event) {
- case CATTA_BROWSER_FAILURE:
- if(pthread_mutex_lock(&mesh->mutex) != 0) {
- abort();
+ if(ifap->ifa_flags & IFF_UP && ifap->ifa_flags & IFF_MULTICAST && !(ifap->ifa_flags & IFF_LOOPBACK)) {
+ iface_up(mesh, index);
+ } else {
+ iface_down(mesh, index);
}
- catta_simple_poll_quit(mesh->catta_poll);
- pthread_mutex_unlock(&mesh->mutex);
- break;
-
- case CATTA_BROWSER_NEW:
- if(pthread_mutex_lock(&mesh->mutex) != 0) {
- abort();
+ if(!ifap->ifa_addr) {
+ continue;
}
- catta_s_service_resolver_new(mesh->catta_server, interface_, protocol, name, type, domain, CATTA_PROTO_UNSPEC, 0, discovery_resolve_callback, mesh);
- handle_network_change(mesh, ++mesh->catta_interfaces);
- pthread_mutex_unlock(&mesh->mutex);
- break;
+ discovery_address_t addr = {
+ .index = index,
+ };
- case CATTA_BROWSER_REMOVE:
- if(pthread_mutex_lock(&mesh->mutex) != 0) {
- abort();
+ sockaddr_t *sa = (sockaddr_t *)ifap->ifa_addr;
+
+ if(sa->sa.sa_family == AF_INET) {
+ memcpy(&addr.address.in, &sa->in, sizeof(sa->in));
+ addr.address.in.sin_port = ntohs(5353);
+ } else if(sa->sa.sa_family == AF_INET6) {
+ memcpy(&addr.address.in6, &sa->in6, sizeof(sa->in6));
+ addr.address.in6.sin6_port = ntohs(5353);
+ } else {
+ addr.address.sa.sa_family = AF_UNKNOWN;
}
- handle_network_change(mesh, --mesh->catta_interfaces);
- pthread_mutex_unlock(&mesh->mutex);
- break;
+ if(addr.address.sa.sa_family != AF_UNKNOWN) {
+ addr_add(mesh, &addr);
+ }
+ }
- case CATTA_BROWSER_ALL_FOR_NOW:
- case CATTA_BROWSER_CACHE_EXHAUSTED:
- break;
+ freeifaddrs(ifa);
+#else
+ (void)mesh;
+#endif
+}
+
+#if defined(__linux)
+static void netlink_getlink(int fd) {
+ static const struct {
+ struct nlmsghdr nlm;
+ struct ifinfomsg ifi;
+ } msg = {
+ .nlm.nlmsg_len = NLMSG_LENGTH(sizeof(msg.ifi)),
+ .nlm.nlmsg_type = RTM_GETLINK,
+ .nlm.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlm.nlmsg_seq = 1,
+ .ifi.ifi_family = AF_UNSPEC,
+ };
+ send(fd, &msg, msg.nlm.nlmsg_len, 0);
+}
+
+static void netlink_getaddr(int fd) {
+ static const struct {
+ struct nlmsghdr nlm;
+ struct ifaddrmsg ifa;
+ } msg = {
+ .nlm.nlmsg_len = NLMSG_LENGTH(sizeof(msg.ifa)),
+ .nlm.nlmsg_type = RTM_GETADDR,
+ .nlm.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
+ .nlm.nlmsg_seq = 2,
+ .ifa.ifa_family = AF_UNSPEC,
+ };
+ send(fd, &msg, msg.nlm.nlmsg_len, 0);
+}
+
+static void netlink_parse_link(meshlink_handle_t *mesh, const struct nlmsghdr *nlm) {
+ const struct ifinfomsg *ifi = (const struct ifinfomsg *)(nlm + 1);
+
+ if(ifi->ifi_flags & IFF_UP && ifi->ifi_flags & IFF_MULTICAST) {
+ iface_up(mesh, ifi->ifi_index);
+ } else {
+ iface_down(mesh, ifi->ifi_index);
}
}
-static void discovery_log_cb(CattaLogLevel level, const char *txt) {
- meshlink_log_level_t mlevel = MESHLINK_CRITICAL;
+static void netlink_parse_addr(meshlink_handle_t *mesh, const struct nlmsghdr *nlm) {
+ const struct ifaddrmsg *ifa = (const struct ifaddrmsg *)(nlm + 1);
+ const uint8_t *ptr = (const uint8_t *)(ifa + 1);
+ size_t len = nlm->nlmsg_len - (ptr - (const uint8_t *)nlm);
- switch(level) {
- case CATTA_LOG_ERROR:
- mlevel = MESHLINK_ERROR;
- break;
+ while(len >= sizeof(struct rtattr)) {
+ const struct rtattr *rta = (const struct rtattr *)ptr;
- case CATTA_LOG_WARN:
- mlevel = MESHLINK_WARNING;
- break;
+ if(rta->rta_len <= 0 || rta->rta_len > len) {
+ break;
+ }
- case CATTA_LOG_NOTICE:
- case CATTA_LOG_INFO:
- mlevel = MESHLINK_INFO;
- break;
+ if(rta->rta_type == IFA_ADDRESS) {
+ discovery_address_t addr = {
+ .index = ifa->ifa_index,
+ };
+
+ if(rta->rta_len == 8) {
+ addr.address.sa.sa_family = AF_INET;
+ memcpy(&addr.address.in.sin_addr, ptr + 4, 4);
+ addr.address.in.sin_port = ntohs(5353);
+ } else if(rta->rta_len == 20) {
+ addr.address.sa.sa_family = AF_INET6;
+ memcpy(&addr.address.in6.sin6_addr, ptr + 4, 16);
+ addr.address.in6.sin6_port = ntohs(5353);
+ addr.address.in6.sin6_scope_id = ifa->ifa_index;
+ } else {
+ addr.address.sa.sa_family = AF_UNKNOWN;
+ }
- case CATTA_LOG_DEBUG:
- default:
- mlevel = MESHLINK_DEBUG;
- break;
- }
+ if(addr.address.sa.sa_family != AF_UNKNOWN) {
+ if(nlm->nlmsg_type == RTM_NEWADDR) {
+ addr_add(mesh, &addr);
+ } else {
+ addr_del(mesh, &addr);
+ }
+ }
+ }
- logger(NULL, mlevel, "%s\n", txt);
+ unsigned short rta_len = (rta->rta_len + 3) & ~3;
+ ptr += rta_len;
+ len -= rta_len;
+ }
}
-static void *discovery_loop(void *userdata) {
- bool status = false;
- meshlink_handle_t *mesh = userdata;
- assert(mesh);
+static void netlink_parse(meshlink_handle_t *mesh, const void *data, size_t len) {
+ const uint8_t *ptr = data;
- if(pthread_mutex_lock(&mesh->discovery_mutex) != 0) {
- abort();
- }
+ while(len >= sizeof(struct nlmsghdr)) {
+ const struct nlmsghdr *nlm = (const struct nlmsghdr *)ptr;
- // handle catta logs
- catta_set_log_function(discovery_log_cb);
+ if(nlm->nlmsg_len > len) {
+ break;
+ }
- // create service type string
- char appname[strlen(mesh->appname) + 2];
- strcpy(appname, mesh->appname);
+ switch(nlm->nlmsg_type) {
+ case RTM_NEWLINK:
+ case RTM_DELLINK:
+ netlink_parse_link(mesh, nlm);
+ break;
- for(char *p = appname; *p; p++) {
- if(!isalnum(*p) && *p != '_' && *p != '-') {
- *p = '_';
+ case RTM_NEWADDR:
+ case RTM_DELADDR:
+ netlink_parse_addr(mesh, nlm);
}
- }
- if(!appname[1]) {
- appname[1] = '_';
- appname[2] = '\0';
+ ptr += nlm->nlmsg_len;
+ len -= nlm->nlmsg_len;
}
+}
- size_t servicetype_strlen = sizeof(MESHLINK_MDNS_SERVICE_TYPE) + strlen(appname) + 1;
- mesh->catta_servicetype = malloc(servicetype_strlen);
+static void netlink_io_handler(event_loop_t *loop, void *data, int flags) {
+ (void)flags;
+ (void)data;
+ meshlink_handle_t *mesh = loop->data;
- if(mesh->catta_servicetype == NULL) {
- logger(mesh, MESHLINK_ERROR, "Failed to allocate memory for service type string.\n");
- goto fail;
- }
+ struct {
+ struct nlmsghdr nlm;
+ char data[16384];
+ } msg;
- snprintf(mesh->catta_servicetype, servicetype_strlen, MESHLINK_MDNS_SERVICE_TYPE, appname);
+ while(true) {
+ ssize_t result = recv(mesh->discovery.pfroute_io.fd, &msg, sizeof(msg), MSG_DONTWAIT);
- // Allocate discovery loop object
- if(!(mesh->catta_poll = catta_simple_poll_new())) {
- logger(mesh, MESHLINK_ERROR, "Failed to create discovery poll object.\n");
- goto fail;
- }
+ if(result <= 0) {
+ if(result == 0 || errno == EAGAIN || errno == EINTR) {
+ break;
+ }
- // generate some unique host name (we actually do not care about it)
- char hostname[17];
- generate_rand_string(mesh, hostname, sizeof(hostname));
+ logger(mesh, MESHLINK_ERROR, "Reading from Netlink socket failed: %s\n", strerror(errno));
+ io_set(loop, &mesh->discovery.pfroute_io, 0);
+ }
- // Let's set the host name for this server.
- CattaServerConfig config;
- catta_server_config_init(&config);
- config.host_name = catta_strdup(hostname);
- config.publish_workstation = 0;
- config.disallow_other_stacks = 0;
- config.publish_hinfo = 0;
- config.publish_addresses = 1;
- config.publish_no_reverse = 1;
- config.allow_point_to_point = 1;
+ if((size_t)result < sizeof(msg.nlm)) {
+ logger(mesh, MESHLINK_ERROR, "Invalid Netlink message\n");
+ break;
+ }
- /* Allocate a new server */
- int error;
- const CattaPoll *poller = catta_simple_poll_get(mesh->catta_poll);
+ if(msg.nlm.nlmsg_type == NLMSG_DONE) {
+ if(msg.nlm.nlmsg_seq == 1) {
+ // We just got the result of GETLINK, now send GETADDR.
+ netlink_getaddr(mesh->discovery.pfroute_io.fd);
+ }
+ } else {
+ netlink_parse(mesh, &msg, result);
- if(!poller) {
- logger(mesh, MESHLINK_ERROR, "Failed to create discovery server: %s\n", catta_strerror(error));
- goto fail;
+ if(loop->now.tv_sec > mesh->discovery.last_update + 5) {
+ mesh->discovery.last_update = loop->now.tv_sec;
+ handle_network_change(mesh, true);
+ }
+ }
}
+}
+#elif defined(__APPLE__)
+static void reachability_change_callback(SCNetworkReachabilityRef reachability, SCNetworkReachabilityFlags flags, void *info) {
+ (void)reachability;
+ (void)flags;
- mesh->catta_server = catta_server_new(poller, &config, discovery_server_callback, mesh, &error);
+ meshlink_handle_t *mesh = info;
- /* Free the configuration data */
- catta_server_config_free(&config);
+ pthread_mutex_lock(&mesh->mutex);
- /* Check whether creating the server object succeeded */
- if(!mesh->catta_server) {
- logger(mesh, MESHLINK_ERROR, "Failed to create discovery server: %s\n", catta_strerror(error));
- goto fail;
- }
+ scan_ifaddrs(mesh);
- // Create the service browser
- if(!(mesh->catta_browser = catta_s_service_browser_new(mesh->catta_server, CATTA_IF_UNSPEC, CATTA_PROTO_UNSPEC, mesh->catta_servicetype, NULL, 0, discovery_browse_callback, mesh))) {
- logger(mesh, MESHLINK_ERROR, "Failed to create discovery service browser: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
- goto fail;
+ if(mesh->loop.now.tv_sec > mesh->discovery.last_update + 5) {
+ logger(mesh, MESHLINK_INFO, "Network change detected");
+ mesh->discovery.last_update = mesh->loop.now.tv_sec;
+ handle_network_change(mesh, true);
}
- status = true;
+ pthread_mutex_unlock(&mesh->mutex);
+}
-fail:
+static void *network_change_handler(void *arg) {
+ meshlink_handle_t *mesh = arg;
- pthread_cond_broadcast(&mesh->discovery_cond);
- pthread_mutex_unlock(&mesh->discovery_mutex);
+ mesh->discovery.runloop = CFRunLoopGetCurrent();
- if(status) {
- catta_simple_poll_loop(mesh->catta_poll);
- }
+ SCNetworkReachabilityRef reach_v4 = SCNetworkReachabilityCreateWithName(NULL, "93.184.216.34");
+ SCNetworkReachabilityRef reach_v6 = SCNetworkReachabilityCreateWithName(NULL, "2606:2800:220:1:248:1893:25c8:1946");
- if(mesh->catta_browser) {
- catta_s_service_browser_free(mesh->catta_browser);
- mesh->catta_browser = NULL;
- }
+ SCNetworkReachabilityContext context;
+ memset(&context, 0, sizeof(context));
+ context.info = mesh;
- if(mesh->catta_group) {
- catta_s_entry_group_reset(mesh->catta_group);
- catta_s_entry_group_free(mesh->catta_group);
- mesh->catta_group = NULL;
+ if(reach_v4) {
+ SCNetworkReachabilitySetCallback(reach_v4, reachability_change_callback, &context);
+ SCNetworkReachabilityScheduleWithRunLoop(reach_v4, mesh->discovery.runloop, kCFRunLoopDefaultMode);
+ } else {
+ logger(mesh, MESHLINK_ERROR, "Could not create IPv4 network reachability watcher");
}
- if(mesh->catta_server) {
- catta_server_free(mesh->catta_server);
- mesh->catta_server = NULL;
+ if(reach_v6) {
+ SCNetworkReachabilitySetCallback(reach_v6, reachability_change_callback, &context);
+ SCNetworkReachabilityScheduleWithRunLoop(reach_v6, mesh->discovery.runloop, kCFRunLoopDefaultMode);
+ } else {
+ logger(mesh, MESHLINK_ERROR, "Could not create IPv6 network reachability watcher");
}
- if(mesh->catta_poll) {
- catta_simple_poll_free(mesh->catta_poll);
- mesh->catta_poll = NULL;
+ CFRunLoopRun();
+
+ mesh->discovery.runloop = NULL;
+
+ if(reach_v4) {
+ SCNetworkReachabilityUnscheduleFromRunLoop(reach_v4, mesh->discovery.runloop, kCFRunLoopDefaultMode);
+ CFRelease(reach_v4);
}
- if(mesh->catta_servicetype) {
- free(mesh->catta_servicetype);
- mesh->catta_servicetype = NULL;
+ if(reach_v6) {
+ SCNetworkReachabilityUnscheduleFromRunLoop(reach_v6, mesh->discovery.runloop, kCFRunLoopDefaultMode);
+ CFRelease(reach_v6);
}
return NULL;
}
+#elif defined(RTM_NEWADDR)
+static void pfroute_parse_iface(meshlink_handle_t *mesh, const struct rt_msghdr *rtm) {
+ const struct if_msghdr *ifm = (const struct if_msghdr *)rtm;
+
+ if(ifm->ifm_flags & IFF_UP && ifm->ifm_flags & IFF_MULTICAST && !(ifm->ifm_flags & IFF_LOOPBACK)) {
+ iface_up(mesh, ifm->ifm_index);
+ } else {
+ iface_down(mesh, ifm->ifm_index);
+ }
+}
+
+static void pfroute_parse_addr(meshlink_handle_t *mesh, const struct rt_msghdr *rtm) {
+ const struct ifa_msghdr *ifam = (const struct ifa_msghdr *)rtm;
+ const char *p = (const char *)(ifam + 1);
+
+ for(unsigned int i = 1; i; i <<= 1) {
+ if(!(ifam->ifam_addrs & i)) {
+ continue;
+ }
+
+ const sockaddr_t *sa = (const sockaddr_t *)p;
+
+ if(i == RTA_IFA) {
+ discovery_address_t addr = {
+ .index = ifam->ifam_index,
+ };
+
+ if(sa->sa.sa_family == AF_INET) {
+ addr.address.in = sa->in;
+ addr.address.in.sin_port = ntohs(5353);
+ } else if(sa->sa.sa_family == AF_INET6) {
+ addr.address.in6 = sa->in6;
+ addr.address.in6.sin6_port = ntohs(5353);
+ } else {
+ addr.address.sa.sa_family = AF_UNKNOWN;
+ }
+
+ if(addr.address.sa.sa_family != AF_UNKNOWN) {
+ if(ifam->ifam_type == RTM_NEWADDR) {
+ addr_add(mesh, &addr);
+ } else {
+ addr_del(mesh, &addr);
+ }
+ }
+
+ break;
+ }
+
+ size_t len = (sa->sa.sa_len + 3) & ~3;
+ p += len;
+ }
+}
-#ifdef RTM_NEWADDR
static void pfroute_io_handler(event_loop_t *loop, void *data, int flags) {
(void)flags;
- static time_t prev_update;
- meshlink_handle_t *mesh = data;
+ (void)data;
+ meshlink_handle_t *mesh = loop->data;
struct {
struct rt_msghdr rtm;
while(true) {
msg.rtm.rtm_version = 0;
- ssize_t result = recv(mesh->pfroute_io.fd, &msg, sizeof(msg), MSG_DONTWAIT);
+ ssize_t result = recv(mesh->discovery.pfroute_io.fd, &msg, sizeof(msg), MSG_DONTWAIT);
if(result <= 0) {
if(result == 0 || errno == EAGAIN || errno == EINTR) {
}
logger(mesh, MESHLINK_ERROR, "Reading from PFROUTE socket failed: %s\n", strerror(errno));
- io_set(loop, &mesh->pfroute_io, 0);
+ io_set(loop, &mesh->discovery.pfroute_io, 0);
}
if(msg.rtm.rtm_version != RTM_VERSION) {
switch(msg.rtm.rtm_type) {
case RTM_IFINFO:
+ pfroute_parse_iface(mesh, &msg.rtm);
+ break;
+
case RTM_NEWADDR:
case RTM_DELADDR:
- if(loop->now.tv_sec > prev_update + 5) {
- prev_update = loop->now.tv_sec;
- handle_network_change(mesh, 1);
- }
-
+ pfroute_parse_addr(mesh, &msg.rtm);
break;
default:
logger(mesh, MESHLINK_DEBUG, "discovery_start called\n");
assert(mesh);
- assert(!mesh->catta_poll);
- assert(!mesh->catta_server);
- assert(!mesh->catta_browser);
- assert(!mesh->discovery_threadstarted);
- assert(!mesh->catta_servicetype);
- if(pthread_mutex_lock(&mesh->discovery_mutex) != 0) {
- abort();
+ // Set up multicast sockets for mDNS
+ static const int one = 1;
+ static const int ttl = 255;
+ static const uint8_t one8 = 1;
+ static const uint8_t ttl8 = 255;
+
+ int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+
+ if(fd == -1) {
+ logger(mesh, MESHLINK_ERROR, "Error creating IPv4 socket: %s", strerror(errno));
+ } else {
+
+ sockaddr_t sa4 = {
+ .in.sin_family = AF_INET,
+ .in.sin_port = ntohs(5353),
+ };
+ setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+#ifdef SO_REUSEPORT
+ setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &one, sizeof(one));
+#endif
+#ifdef IP_PKTINFO
+ setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &one, sizeof(one));
+#endif
+ setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &one8, sizeof(one8));
+ setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl8, sizeof(ttl8));
+
+ if(bind(fd, &sa4.sa, SALEN(sa4.sa)) == -1) {
+ logger(mesh, MESHLINK_ERROR, "Error binding to IPv4 multicast socket: %s", strerror(errno));
+ } else {
+ io_add(&mesh->loop, &mesh->discovery.sockets[0], mdns_io_handler, &mesh->discovery.sockets[0], fd, IO_READ);
+ }
}
- // Start the discovery thread
- if(pthread_create(&mesh->discovery_thread, NULL, discovery_loop, mesh) != 0) {
- pthread_mutex_unlock(&mesh->discovery_mutex);
- logger(mesh, MESHLINK_ERROR, "Could not start discovery thread: %s\n", strerror(errno));
- memset(&mesh->discovery_thread, 0, sizeof(mesh)->discovery_thread);
- return false;
+ fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
+
+ if(fd == -1) {
+ logger(mesh, MESHLINK_ERROR, "Error creating IPv6 socket: %s", strerror(errno));
+ } else {
+ sockaddr_t sa6 = {
+ .in6.sin6_family = AF_INET6,
+ .in6.sin6_port = ntohs(5353),
+ };
+
+ setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
+#ifdef SO_REUSEPORT
+ setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &one, sizeof(one));
+#endif
+#ifdef IPV6_RECVPKTINFO
+ setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &one, sizeof(one));
+#endif
+ setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
+ setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &one, sizeof(one));
+ setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl));
+ setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
+
+ if(bind(fd, &sa6.sa, SALEN(sa6.sa)) == -1) {
+ logger(mesh, MESHLINK_ERROR, "Error binding to IPv6 multicast socket: %s", strerror(errno));
+ } else {
+ io_add(&mesh->loop, &mesh->discovery.sockets[1], mdns_io_handler, &mesh->discovery.sockets[1], fd, IO_READ);
+ }
}
- pthread_cond_wait(&mesh->discovery_cond, &mesh->discovery_mutex);
- pthread_mutex_unlock(&mesh->discovery_mutex);
+#if defined(__linux)
+ int sock = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
- mesh->discovery_threadstarted = true;
+ if(sock != -1) {
+ struct sockaddr_nl sa;
+ memset(&sa, 0, sizeof(sa));
+ sa.nl_family = AF_NETLINK;
+ sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR;
+
+ if(bind(sock, (struct sockaddr *)&sa, sizeof(sa)) != -1) {
+ io_add(&mesh->loop, &mesh->discovery.pfroute_io, netlink_io_handler, NULL, sock, IO_READ);
+ netlink_getlink(sock);
+ } else {
+ logger(mesh, MESHLINK_WARNING, "Could not bind AF_NETLINK socket: %s", strerror(errno));
+ scan_ifaddrs(mesh);
+ }
+ } else {
+ logger(mesh, MESHLINK_WARNING, "Could not open AF_NETLINK socket: %s", strerror(errno));
+ scan_ifaddrs(mesh);
+ }
-#ifdef RTM_NEWADDR
+#elif defined(__APPLE__)
+ pthread_create(&mesh->discovery.thread, NULL, network_change_handler, mesh);
+ // TODO: Do we need to wait for the thread to start succesfully?
+ scan_ifaddrs(mesh);
+#elif defined(RTM_NEWADDR)
int sock = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC);
if(sock != -1) {
- io_add(&mesh->loop, &mesh->pfroute_io, pfroute_io_handler, mesh, sock, IO_READ);
+ io_add(&mesh->loop, &mesh->discovery.pfroute_io, pfroute_io_handler, NULL, sock, IO_READ);
} else {
logger(mesh, MESHLINK_WARNING, "Could not open PF_ROUTE socket: %s", strerror(errno));
}
+ scan_ifaddrs(mesh);
#endif
return true;
assert(mesh);
-#ifdef RTM_NEWADDR
+ free(mesh->discovery.ifaces);
+ free(mesh->discovery.addresses);
+ mesh->discovery.ifaces = NULL;
+ mesh->discovery.addresses = NULL;
+ mesh->discovery.iface_count = 0;
+ mesh->discovery.address_count = 0;
- if(mesh->pfroute_io.cb) {
- close(mesh->pfroute_io.fd);
- io_del(&mesh->loop, &mesh->pfroute_io);
+#if defined(__APPLE__)
+
+ if(mesh->discovery.runloop) {
+ CFRunLoopStop(mesh->discovery.runloop);
+ pthread_join(mesh->discovery.thread, NULL);
}
#endif
- // Shut down
- if(mesh->catta_poll) {
- catta_simple_poll_quit(mesh->catta_poll);
+ if(mesh->discovery.pfroute_io.cb) {
+ close(mesh->discovery.pfroute_io.fd);
+ io_del(&mesh->loop, &mesh->discovery.pfroute_io);
}
- // Wait for the discovery thread to finish
- if(mesh->discovery_threadstarted == true) {
- if(pthread_join(mesh->discovery_thread, NULL) != 0) {
- abort();
+ for(int i = 0; i < 2; i++) {
+ if(mesh->discovery.sockets[i].cb) {
+ close(mesh->discovery.sockets[i].fd);
+ io_del(&mesh->loop, &mesh->discovery.sockets[i]);
}
-
- mesh->discovery_threadstarted = false;
}
+}
- mesh->catta_interfaces = 0;
+void discovery_refresh(meshlink_handle_t *mesh) {
+ for(int i = 0; i < mesh->discovery.address_count; i++) {
+ if(mesh->discovery.addresses[i].up) {
+ send_mdns_packet(mesh, &mesh->discovery.addresses[i], false);
+ }
+ }
}
projects / meshlink / blobdiff