#include <arpa/inet.h>
#include <fcntl.h>
#include <stdlib.h>
-#include <time.h>
+#include <inttypes.h>
#include "unetd.h"
-
-#define PEX_BUF_SIZE 1024
-
-enum pex_opcode {
- PEX_MSG_HELLO,
- PEX_MSG_NOTIFY_PEERS,
- PEX_MSG_QUERY,
- PEX_MSG_PING,
- PEX_MSG_PONG,
-};
-
-#define PEX_ID_LEN 8
-
-struct pex_hdr {
- uint8_t version;
- uint8_t opcode;
- uint16_t len;
- uint8_t id[PEX_ID_LEN];
-};
-
-#define PEER_EP_F_IPV6 (1 << 0)
-#define PEER_EP_F_LOCAL (1 << 1)
-
-struct pex_peer_endpoint {
- uint16_t flags;
- uint16_t port;
- uint8_t peer_id[PEX_ID_LEN];
- uint8_t addr[16];
-};
-
-struct pex_hello {
- uint16_t flags;
- uint8_t local_addr[16];
-};
-
-static char tx_buf[PEX_BUF_SIZE];
+#include "pex-msg.h"
static const char *pex_peer_id_str(const uint8_t *key)
{
return str;
}
+static struct pex_hdr *
+pex_msg_init(struct network *net, uint8_t opcode)
+{
+ return __pex_msg_init(net->config.pubkey, opcode);
+}
+
+static struct pex_hdr *
+pex_msg_init_ext(struct network *net, uint8_t opcode, bool ext)
+{
+ return __pex_msg_init_ext(net->config.pubkey, net->config.auth_key, opcode, ext);
+}
static struct network_peer *
pex_msg_peer(struct network *net, const uint8_t *id)
return peer;
}
-static struct pex_hdr *pex_msg_init(struct network *net, uint8_t opcode)
+static void
+pex_get_peer_addr(struct sockaddr_in6 *sin6, struct network *net,
+ struct network_peer *peer)
{
- struct pex_hdr *hdr = (struct pex_hdr *)tx_buf;
-
- hdr->version = 0;
- hdr->opcode = opcode;
- hdr->len = 0;
- memcpy(hdr->id, net->config.pubkey, sizeof(hdr->id));
-
- return hdr;
+ *sin6 = (struct sockaddr_in6){
+ .sin6_family = AF_INET6,
+ .sin6_addr = peer->local_addr.in6,
+ .sin6_port = htons(net->net_config.pex_port),
+ };
}
-static void *pex_msg_append(size_t len)
+static void pex_msg_send(struct network *net, struct network_peer *peer)
{
- struct pex_hdr *hdr = (struct pex_hdr *)tx_buf;
- int ofs = hdr->len + sizeof(struct pex_hdr);
- void *buf = &tx_buf[ofs];
-
- if (sizeof(tx_buf) - ofs < len)
- return NULL;
+ struct sockaddr_in6 sin6 = {};
- hdr->len += len;
- memset(buf, 0, len);
+ if (!peer || peer == &net->net_config.local_host->peer || !peer->state.connected)
+ return;
- return buf;
+ pex_get_peer_addr(&sin6, net, peer);
+ if (__pex_msg_send(net->pex.fd.fd, &sin6) < 0)
+ D_PEER(net, peer, "pex_msg_send failed: %s", strerror(errno));
}
-static void pex_msg_send(struct network *net, struct network_peer *peer)
+static void pex_msg_send_ext(struct network *net, struct network_peer *peer,
+ struct sockaddr_in6 *addr)
{
- struct sockaddr_in6 sin6 = {};
- struct pex_hdr *hdr = (struct pex_hdr *)tx_buf;
- size_t tx_len = sizeof(*hdr) + hdr->len;
- int ret;
+ char addrbuf[INET6_ADDRSTRLEN];
- if (peer == &net->net_config.local_host->peer || !peer->state.connected)
- return;
+ if (!addr)
+ return pex_msg_send(net, peer);
- sin6.sin6_family = AF_INET6;
- memcpy(&sin6.sin6_addr, &peer->local_addr.in6,
- sizeof(peer->local_addr.in6));
- sin6.sin6_port = htons(net->net_config.pex_port);
- hdr->len = htons(hdr->len);
- ret = sendto(net->pex.fd.fd, tx_buf, tx_len, 0, (struct sockaddr *)&sin6, sizeof(sin6));
- hdr->len = ntohs(hdr->len);
- if (ret < 0)
- D_PEER(net, peer, "pex_msg_send failed: %s", strerror(errno));
+ if (__pex_msg_send(-1, addr) < 0)
+ D_NET(net, "pex_msg_send_ext(%s) failed: %s",
+ inet_ntop(addr->sin6_family, (const void *)&addr->sin6_addr, addrbuf,
+ sizeof(addrbuf)),
+ strerror(errno));
}
static void
pex_msg_send(net, peer);
}
-
static int
pex_msg_add_peer_endpoint(struct network *net, struct network_peer *peer,
struct network_peer *receiver)
}
}
+static void
+network_pex_host_request_update(struct network *net, struct network_pex_host *host)
+{
+ char addrstr[INET6_ADDRSTRLEN];
+ uint64_t version = 0;
+
+ if (net->net_data_len)
+ version = net->net_data_version;
+
+ D("request network data from host %s",
+ inet_ntop(host->endpoint.sa.sa_family,
+ (host->endpoint.sa.sa_family == AF_INET6 ?
+ (const void *)&host->endpoint.in6.sin6_addr :
+ (const void *)&host->endpoint.in.sin_addr),
+ addrstr, sizeof(addrstr)));
+
+ if (!pex_msg_update_request_init(net->config.pubkey, net->config.key,
+ net->config.auth_key, &host->endpoint,
+ version, true))
+ return;
+ __pex_msg_send(-1, &host->endpoint);
+}
+
+static void
+network_pex_request_update_cb(struct uloop_timeout *t)
+{
+ struct network *net = container_of(t, struct network, pex.request_update_timer);
+ struct network_pex *pex = &net->pex;
+ struct network_pex_host *host;
+
+ uloop_timeout_set(t, 5000);
+
+ if (list_empty(&pex->hosts))
+ return;
+
+ host = list_first_entry(&pex->hosts, struct network_pex_host, list);
+ list_move_tail(&host->list, &pex->hosts);
+ network_pex_host_request_update(net, host);
+}
+
void network_pex_init(struct network *net)
{
struct network_pex *pex = &net->pex;
memset(pex, 0, sizeof(*pex));
pex->fd.fd = -1;
+ INIT_LIST_HEAD(&pex->hosts);
+ pex->request_update_timer.cb = network_pex_request_update_cb;
}
static void
pex_msg_send(net, peer);
}
+static void
+network_pex_send_update_request(struct network *net, struct network_peer *peer,
+ struct sockaddr_in6 *addr)
+{
+ union network_endpoint ep = {};
+ uint64_t version = 0;
+
+ if (addr)
+ memcpy(&ep.in6, addr, sizeof(ep.in6));
+ else
+ pex_get_peer_addr(&ep.in6, net, peer);
+
+ if (net->net_data_len)
+ version = net->net_data_version;
+
+ if (!pex_msg_update_request_init(net->config.pubkey, net->config.key,
+ net->config.auth_key, &ep,
+ version, !!addr))
+ return;
+
+ pex_msg_send_ext(net, peer, addr);
+}
+
void network_pex_event(struct network *net, struct network_peer *peer,
enum pex_event ev)
{
switch (ev) {
case PEX_EV_HANDSHAKE:
pex_send_hello(net, peer);
+ if (net->config.type == NETWORK_TYPE_DYNAMIC)
+ network_pex_send_update_request(net, peer, NULL);
break;
case PEX_EV_ENDPOINT_CHANGE:
network_pex_handle_endpoint_change(net, peer);
pex_msg_send(net, peer);
}
+static void
+network_pex_recv_update_request(struct network *net, struct network_peer *peer,
+ const uint8_t *data, size_t len,
+ struct sockaddr_in6 *addr)
+{
+ struct pex_update_request *req = (struct pex_update_request *)data;
+ struct pex_msg_update_send_ctx ctx = {};
+ uint64_t req_version = be64_to_cpu(req->cur_version);
+ int *query_count;
+ bool done = false;
+
+ if (len < sizeof(struct pex_update_request))
+ return;
+
+ if (net->config.type != NETWORK_TYPE_DYNAMIC)
+ return;
+
+ if (peer)
+ query_count = &peer->state.num_net_queries;
+ else
+ query_count = &net->num_net_queries;
+
+ if (++*query_count > 10)
+ return;
+
+ D("receive update request, local version=%"PRIu64", remote version=%"PRIu64, net->net_data_version, req_version);
+
+ if (req_version >= net->net_data_version) {
+ struct pex_update_response_no_data *res;
+
+ pex_msg_init_ext(net, PEX_MSG_UPDATE_RESPONSE_NO_DATA, !!addr);
+ res = pex_msg_append(sizeof(*res));
+ res->req_id = req->req_id;
+ res->cur_version = cpu_to_be64(net->net_data_version);
+ pex_msg_send_ext(net, peer, addr);
+ }
+
+ if (req_version > net->net_data_version)
+ network_pex_send_update_request(net, peer, addr);
+
+ if (!peer || !net->net_data_len)
+ return;
+
+ if (req_version >= net->net_data_version)
+ return;
+
+ pex_msg_update_response_init(&ctx, net->config.pubkey, net->config.auth_key,
+ peer->key, !!addr, (void *)data,
+ net->net_data, net->net_data_len);
+ while (!done) {
+ pex_msg_send_ext(net, peer, addr);
+ done = !pex_msg_update_response_continue(&ctx);
+ }
+}
+
+static void
+network_pex_recv_update_response(struct network *net, const uint8_t *data, size_t len,
+ struct sockaddr_in6 *addr, enum pex_opcode op)
+{
+ struct network_peer *peer;
+ void *net_data;
+ int net_data_len = 0;
+ uint64_t version = 0;
+ bool no_prev_data = !net->net_data_len;
+
+ if (net->config.type != NETWORK_TYPE_DYNAMIC)
+ return;
+
+ net_data = pex_msg_update_response_recv(data, len, op, &net_data_len, &version);
+ if (!net_data)
+ return;
+
+ if (version <= net->net_data_version) {
+ free(net_data);
+ return;
+ }
+
+ D_NET(net, "received updated network data, len=%d", net_data_len);
+ free(net->net_data);
+
+ net->net_data = net_data;
+ net->net_data_len = net_data_len;
+ net->net_data_version = version;
+ if (network_save_dynamic(net) < 0)
+ return;
+
+ uloop_timeout_set(&net->reload_timer, no_prev_data ? 1 : UNETD_DATA_UPDATE_DELAY);
+ vlist_for_each_element(&net->peers, peer, node) {
+ if (!peer->state.connected)
+ continue;
+ network_pex_send_update_request(net, peer, NULL);
+ }
+}
+
static void
network_pex_recv(struct network *net, struct network_peer *peer, struct pex_hdr *hdr)
{
break;
case PEX_MSG_PONG:
break;
+ case PEX_MSG_UPDATE_REQUEST:
+ network_pex_recv_update_request(net, peer, data, hdr->len,
+ NULL);
+ break;
+ case PEX_MSG_UPDATE_RESPONSE:
+ case PEX_MSG_UPDATE_RESPONSE_DATA:
+ case PEX_MSG_UPDATE_RESPONSE_NO_DATA:
+ network_pex_recv_update_response(net, data, hdr->len,
+ NULL, hdr->opcode);
+ break;
}
}
}
}
+static void
+network_pex_create_host(struct network *net, union network_endpoint *ep)
+{
+ struct network_pex *pex = &net->pex;
+ struct network_pex_host *host;
+
+ host = calloc(1, sizeof(*host));
+ memcpy(&host->endpoint, ep, sizeof(host->endpoint));
+ list_add_tail(&host->list, &pex->hosts);
+ network_pex_host_request_update(net, host);
+}
+
+static void
+network_pex_open_auth_connect(struct network *net)
+{
+ struct network_pex *pex = &net->pex;
+ struct network_peer *peer;
+ struct blob_attr *cur;
+ int rem;
+
+ if (net->config.type != NETWORK_TYPE_DYNAMIC)
+ return;
+
+ uloop_timeout_set(&pex->request_update_timer, 5000);
+
+ vlist_for_each_element(&net->peers, peer, node) {
+ union network_endpoint ep = {};
+
+ if (!peer->endpoint)
+ continue;
+
+ if (network_get_endpoint(&ep, peer->endpoint,
+ UNETD_GLOBAL_PEX_PORT, 0) < 0)
+ continue;
+
+ ep.in.sin_port = htons(UNETD_GLOBAL_PEX_PORT);
+ network_pex_create_host(net, &ep);
+ }
+
+ if (!net->config.auth_connect)
+ return;
+
+ blobmsg_for_each_attr(cur, net->config.auth_connect, rem) {
+ union network_endpoint ep = {};
+
+ if (network_get_endpoint(&ep, blobmsg_get_string(cur),
+ UNETD_GLOBAL_PEX_PORT, 0) < 0)
+ continue;
+
+ network_pex_create_host(net, &ep);
+ }
+}
+
+
int network_pex_open(struct network *net)
{
struct network_host *local_host = net->net_config.local_host;
int yes = 1;
int fd;
+ network_pex_open_auth_connect(net);
+
if (!local_host || !net->net_config.pex_port)
return 0;
void network_pex_close(struct network *net)
{
struct network_pex *pex = &net->pex;
+ struct network_pex_host *host, *tmp;
+
+ uloop_timeout_cancel(&pex->request_update_timer);
+ list_for_each_entry_safe(host, tmp, &pex->hosts, list) {
+ list_del(&host->list);
+ free(host);
+ }
if (pex->fd.fd < 0)
return;
close(pex->fd.fd);
network_pex_init(net);
}
+
+static struct network *
+global_pex_find_network(const uint8_t *id)
+{
+ struct network *net;
+
+ avl_for_each_element(&networks, net, node) {
+ if (!memcmp(id, net->config.auth_key, PEX_ID_LEN))
+ return net;
+ }
+
+ return NULL;
+}
+
+static void
+global_pex_recv(struct pex_hdr *hdr, struct sockaddr_in6 *addr)
+{
+ struct pex_ext_hdr *ehdr = (void *)(hdr + 1);
+ struct network_peer *peer;
+ struct network *net;
+ void *data = (void *)(ehdr + 1);
+
+ if (hdr->version != 0)
+ return;
+
+ net = global_pex_find_network(ehdr->auth_id);
+ if (!net || net->config.type != NETWORK_TYPE_DYNAMIC)
+ return;
+
+ *(uint64_t *)hdr->id ^= pex_network_hash(net->config.auth_key, ehdr->nonce);
+
+ D("PEX global rx op=%d", hdr->opcode);
+ switch (hdr->opcode) {
+ case PEX_MSG_HELLO:
+ case PEX_MSG_NOTIFY_PEERS:
+ case PEX_MSG_QUERY:
+ case PEX_MSG_PING:
+ case PEX_MSG_PONG:
+ break;
+ case PEX_MSG_UPDATE_REQUEST:
+ peer = pex_msg_peer(net, hdr->id);
+ network_pex_recv_update_request(net, peer, data, hdr->len,
+ addr);
+ break;
+ case PEX_MSG_UPDATE_RESPONSE:
+ case PEX_MSG_UPDATE_RESPONSE_DATA:
+ case PEX_MSG_UPDATE_RESPONSE_NO_DATA:
+ network_pex_recv_update_response(net, data, hdr->len, addr, hdr->opcode);
+ break;
+ }
+}
+
+int global_pex_open(void)
+{
+ struct sockaddr_in6 sin6 = {};
+
+ sin6.sin6_family = AF_INET6;
+ sin6.sin6_port = htons(global_pex_port);
+
+ return pex_open(&sin6, sizeof(sin6), global_pex_recv, true);
+}
projects / project / unetd.git / blobdiff