c-ipfs/core/null.c
2017-11-06 13:37:48 -05:00

215 lines
7.8 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "libp2p/conn/session.h"
#include "libp2p/net/connectionstream.h"
#include "libp2p/net/multistream.h"
#include "libp2p/net/p2pnet.h"
#include "libp2p/net/protocol.h"
#include "libp2p/nodeio/nodeio.h"
#include "libp2p/os/utils.h"
#include "libp2p/record/message.h"
#include "libp2p/routing/dht_protocol.h"
#include "libp2p/secio/secio.h"
#include "libp2p/utils/logger.h"
#include "ipfs/core/daemon.h"
#include "ipfs/core/ipfs_node.h"
#include "ipfs/exchange/bitswap/network.h"
#include "ipfs/journal/journal.h"
#include "ipfs/merkledag/merkledag.h"
#include "ipfs/merkledag/node.h"
#include "ipfs/routing/routing.h"
#include "ipfs/util/thread_pool.h"
#define BUF_SIZE 4096
// this should be set to 5 for normal operation, perhaps higher for debugging purposes
#define DEFAULT_NETWORK_TIMEOUT 5
static int null_shutting_down = 0;
/**
* We've received a new connection. Find out what they want.
*
* @param ptr a pointer to a null_connection_params struct
*/
void ipfs_null_connection (void *ptr) {
struct null_connection_params *connection_param = (struct null_connection_params*) ptr;
int retVal = 0;
struct SessionContext* session = libp2p_session_context_new();
if (session == NULL) {
libp2p_logger_error("null", "Unable to allocate SessionContext. Out of memory?\n");
return;
}
session->insecure_stream = libp2p_net_connection_new(connection_param->file_descriptor, connection_param->ip, connection_param->port);
session->default_stream = session->insecure_stream;
session->datastore = connection_param->local_node->repo->config->datastore;
session->filestore = connection_param->local_node->repo->config->filestore;
session->host = connection_param->ip;
session->port = connection_param->port;
libp2p_logger_info("null", "Connection %d, count %d\n", connection_param->file_descriptor, *(connection_param->count));
// try to read from the network
struct StreamMessage *results = 0;
// immediately attempt to negotiate multistream
if (libp2p_net_multistream_send_protocol(session)) {
// handle the call
for(;;) {
// Read from the network
if (!session->default_stream->read(session, &results, DEFAULT_NETWORK_TIMEOUT)) {
// problem reading
break;
}
if (results != NULL) {
retVal = libp2p_protocol_marshal(results, session, connection_param->local_node->protocol_handlers);
libp2p_stream_message_free(results);
}
// exit the loop on error (or if they ask us to no longer loop by returning 0)
if (retVal <= 0)
break;
}
}
(*(connection_param->count))--; // update counter.
if (connection_param->ip != NULL)
free(connection_param->ip);
free (connection_param);
return;
}
int ipfs_null_do_maintenance(struct IpfsNode* local_node, struct Libp2pPeer* peer) {
if (peer == NULL) {
return 0;
}
if (peer->is_local) {
return 1;
}
// Is this peer one of our backup partners?
struct ReplicationPeer* replication_peer = repo_config_get_replication_peer(local_node->repo->config->replication, peer);
long long announce_secs = local_node->repo->config->replication->announce_minutes * 60;
// If so, has there been enough time since the last attempt a backup?
if (replication_peer != NULL) {
announce_secs -= os_utils_gmtime() - replication_peer->lastConnect;
libp2p_logger_debug("null", "Checking to see if we should send backup notification to peer %s. Time since last backup: %lld.\n", libp2p_peer_id_to_string(replication_peer->peer), announce_secs);
}
// should we attempt to connect if we're not already?
if (replication_peer != NULL && local_node->repo->config->replication->announce && announce_secs < 0) {
// try to connect if we aren't already
if (peer->connection_type != CONNECTION_TYPE_CONNECTED) {
if (!libp2p_peer_connect(local_node->dialer, peer, local_node->peerstore, local_node->repo->config->datastore, 2)) {
return 0;
}
}
// attempt a backup, don't forget to reset timer
libp2p_logger_debug("null", "Attempting a sync of node %s.\n", libp2p_peer_id_to_string(peer));
ipfs_journal_sync(local_node, replication_peer);
libp2p_logger_debug("null", "Sync message sent. Maintenance complete for node %s.\n", libp2p_peer_id_to_string(peer));
} else {
unsigned long long last_comm = libp2p_peer_last_comm(peer);
if (os_utils_gmtime() - last_comm > 180) {
// try a ping, but only if we're connected
libp2p_logger_debug("null", "Attempting ping of %s.\n", libp2p_peer_id_to_string(peer));
if (peer->connection_type == CONNECTION_TYPE_CONNECTED && !local_node->routing->Ping(local_node->routing, peer)) {
libp2p_logger_debug("null", "Attempted ping of %s failed.\n", peer->id);
peer->connection_type = CONNECTION_TYPE_NOT_CONNECTED;
}
}
}
return 1;
}
/***
* Called by the daemon to listen for connections
* @param ptr a pointer to an IpfsNodeListenParams struct
* @returns nothing useful.
*/
void* ipfs_null_listen (void *ptr)
{
null_shutting_down = 0;
int socketfd, s, count = 0;
threadpool thpool = thpool_init(25);
struct IpfsNodeListenParams *listen_param;
struct null_connection_params *connection_param;
listen_param = (struct IpfsNodeListenParams*) ptr;
if ((socketfd = socket_listen(socket_tcp4(), &(listen_param->ipv4), &(listen_param->port))) <= 0) {
libp2p_logger_error("null", "Failed to init null router. Address: %d, Port: %d\n", listen_param->ipv4, listen_param->port);
return (void*) 2;
}
libp2p_logger_error("null", "Ipfs listening on %d\n", listen_param->port);
// when we have nothing to do, check on the connections to see if we're still connected
struct Libp2pLinkedList* current_peer_entry = NULL;
if (listen_param->local_node->peerstore->head_entry != NULL)
current_peer_entry = listen_param->local_node->peerstore->head_entry;
// the main loop, listening for new connections
for (;;) {
//libp2p_logger_debug("null", "%s Attempting socket read with fd %d.\n", listen_param->local_node->identity->peer->id, socketfd);
int numDescriptors = socket_read_select4(socketfd, 2);
if (null_shutting_down) {
libp2p_logger_debug("null", "%s null_listen shutting down.\n", listen_param->local_node->identity->peer->id);
break;
}
if (numDescriptors > 0) {
s = socket_accept4(socketfd, &(listen_param->ipv4), &(listen_param->port));
if (count >= CONNECTIONS) { // limit reached.
close (s);
continue;
}
count++;
connection_param = malloc (sizeof (struct null_connection_params));
if (connection_param) {
connection_param->file_descriptor = s;
connection_param->count = &count;
connection_param->local_node = listen_param->local_node;
connection_param->port = listen_param->port;
connection_param->ip = malloc(INET_ADDRSTRLEN);
if (connection_param->ip == NULL) {
// we are out of memory
free(connection_param);
continue;
}
if (inet_ntop(AF_INET, &(listen_param->ipv4), connection_param->ip, INET_ADDRSTRLEN) == NULL) {
free(connection_param->ip);
connection_param->ip = NULL;
connection_param->port = 0;
}
// Create pthread for ipfs_null_connection.
thpool_add_work(thpool, ipfs_null_connection, connection_param);
}
} else {
// timeout... do maintenance
struct PeerEntry* entry = current_peer_entry->item;
ipfs_null_do_maintenance(listen_param->local_node, entry->peer);
if (current_peer_entry != NULL)
current_peer_entry = current_peer_entry->next;
if (current_peer_entry == NULL)
current_peer_entry = listen_param->local_node->peerstore->head_entry;
}
}
thpool_destroy(thpool);
close(socketfd);
return (void*) 2;
}
int ipfs_null_shutdown() {
null_shutting_down = 1;
return 1;
}