891 lines
22 KiB
C
891 lines
22 KiB
C
/*
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* Copyright (c) 2009-2010 by Juliusz Chroboczek
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*
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*/
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/* ansi */
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#include <errno.h>
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#include <stdio.h>
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#include <string.h> /* memcpy(), memset(), memchr(), strlen() */
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#include <stdlib.h> /* atoi() */
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/* posix */
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#include <signal.h> /* sig_atomic_t */
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#ifdef _WIN32
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#include <inttypes.h>
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#include <ws2tcpip.h>
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#undef gai_strerror
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#define gai_strerror gai_strerrorA
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#else
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/socket.h> /* socket(), bind() */
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#include <netdb.h>
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#include <netinet/in.h> /* sockaddr_in */
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#endif
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/* third party */
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#include <event2/event.h>
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#include <dht/dht.h>
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/* libT */
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#include "transmission.h"
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#include "crypto-utils.h"
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#include "file.h"
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#include "log.h"
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#include "net.h"
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#include "peer-mgr.h" /* tr_peerMgrCompactToPex() */
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#include "platform.h" /* tr_threadNew() */
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#include "session.h"
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#include "torrent.h" /* tr_torrentFindFromHash() */
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#include "tr-assert.h"
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#include "tr-dht.h"
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#include "trevent.h" /* tr_runInEventThread() */
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#include "utils.h"
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#include "variant.h"
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static struct event* dht_timer = NULL;
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static unsigned char myid[20];
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static tr_session* session_ = NULL;
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static void timer_callback(evutil_socket_t s, short type, void* ignore);
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struct bootstrap_closure
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{
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tr_session* session;
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uint8_t* nodes;
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uint8_t* nodes6;
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size_t len;
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size_t len6;
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};
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static bool bootstrap_done(tr_session* session, int af)
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{
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int status;
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if (af == 0)
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{
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return bootstrap_done(session, AF_INET) && bootstrap_done(session, AF_INET6);
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}
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status = tr_dhtStatus(session, af, NULL);
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return status == TR_DHT_STOPPED || status >= TR_DHT_FIREWALLED;
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}
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static void nap(int roughly_sec)
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{
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int const roughly_msec = roughly_sec * 1000;
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int const msec = roughly_msec / 2 + tr_rand_int_weak(roughly_msec);
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tr_wait_msec(msec);
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}
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static int bootstrap_af(tr_session* session)
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{
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if (bootstrap_done(session, AF_INET6))
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{
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return AF_INET;
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}
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else if (bootstrap_done(session, AF_INET))
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{
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return AF_INET6;
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}
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else
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{
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return 0;
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}
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}
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static void bootstrap_from_name(char const* name, tr_port port, int af)
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{
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struct addrinfo hints;
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struct addrinfo* info;
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struct addrinfo* infop;
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char pp[10];
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int rc;
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memset(&hints, 0, sizeof(hints));
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hints.ai_socktype = SOCK_DGRAM;
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hints.ai_family = af;
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/* No, just passing p + 1 to gai won't work. */
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tr_snprintf(pp, sizeof(pp), "%d", (int)port);
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rc = getaddrinfo(name, pp, &hints, &info);
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if (rc != 0)
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{
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tr_logAddNamedError("DHT", "%s:%s: %s", name, pp, gai_strerror(rc));
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return;
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}
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infop = info;
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while (infop != NULL)
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{
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dht_ping_node(infop->ai_addr, infop->ai_addrlen);
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nap(15);
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if (bootstrap_done(session_, af))
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{
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break;
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}
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infop = infop->ai_next;
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}
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freeaddrinfo(info);
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}
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static void dht_bootstrap(void* closure)
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{
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struct bootstrap_closure* cl = closure;
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int num = cl->len / 6;
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int num6 = cl->len6 / 18;
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if (session_ != cl->session)
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{
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return;
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}
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if (cl->len > 0)
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{
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tr_logAddNamedInfo("DHT", "Bootstrapping from %d IPv4 nodes", num);
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}
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if (cl->len6 > 0)
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{
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tr_logAddNamedInfo("DHT", "Bootstrapping from %d IPv6 nodes", num6);
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}
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for (int i = 0; i < MAX(num, num6); ++i)
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{
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if (i < num && !bootstrap_done(cl->session, AF_INET))
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{
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tr_port port;
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struct tr_address addr;
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memset(&addr, 0, sizeof(addr));
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addr.type = TR_AF_INET;
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memcpy(&addr.addr.addr4, &cl->nodes[i * 6], 4);
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memcpy(&port, &cl->nodes[i * 6 + 4], 2);
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port = ntohs(port);
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tr_dhtAddNode(cl->session, &addr, port, 1);
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}
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if (i < num6 && !bootstrap_done(cl->session, AF_INET6))
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{
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tr_port port;
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struct tr_address addr;
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memset(&addr, 0, sizeof(addr));
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addr.type = TR_AF_INET6;
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memcpy(&addr.addr.addr6, &cl->nodes6[i * 18], 16);
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memcpy(&port, &cl->nodes6[i * 18 + 16], 2);
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port = ntohs(port);
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tr_dhtAddNode(cl->session, &addr, port, 1);
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}
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/* Our DHT code is able to take up to 9 nodes in a row without
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dropping any. After that, it takes some time to split buckets.
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So ping the first 8 nodes quickly, then slow down. */
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if (i < 8)
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{
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nap(2);
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}
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else
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{
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nap(15);
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}
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if (bootstrap_done(session_, 0))
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{
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break;
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}
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}
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if (!bootstrap_done(cl->session, 0))
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{
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char* bootstrap_file;
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tr_sys_file_t f = TR_BAD_SYS_FILE;
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bootstrap_file = tr_buildPath(cl->session->configDir, "dht.bootstrap", NULL);
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if (bootstrap_file != NULL)
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{
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f = tr_sys_file_open(bootstrap_file, TR_SYS_FILE_READ, 0, NULL);
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}
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if (f != TR_BAD_SYS_FILE)
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{
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tr_logAddNamedInfo("DHT", "Attempting manual bootstrap");
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for (;;)
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{
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char buf[201];
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char* p;
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int port = 0;
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if (!tr_sys_file_read_line(f, buf, 200, NULL))
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{
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break;
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}
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p = memchr(buf, ' ', strlen(buf));
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if (p != NULL)
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{
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port = atoi(p + 1);
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}
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if (p == NULL || port <= 0 || port >= 0x10000)
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{
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tr_logAddNamedError("DHT", "Couldn't parse %s", buf);
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continue;
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}
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*p = '\0';
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bootstrap_from_name(buf, port, bootstrap_af(session_));
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if (bootstrap_done(cl->session, 0))
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{
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break;
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}
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}
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tr_sys_file_close(f, NULL);
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}
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tr_free(bootstrap_file);
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}
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if (!bootstrap_done(cl->session, 0))
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{
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for (int i = 0; i < 6; ++i)
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{
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/* We don't want to abuse our bootstrap nodes, so be very
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slow. The initial wait is to give other nodes a chance
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to contact us before we attempt to contact a bootstrap
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node, for example because we've just been restarted. */
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nap(40);
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if (bootstrap_done(cl->session, 0))
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{
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break;
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}
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if (i == 0)
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{
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tr_logAddNamedInfo("DHT", "Attempting bootstrap from dht.transmissionbt.com");
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}
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bootstrap_from_name("dht.transmissionbt.com", 6881, bootstrap_af(session_));
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}
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}
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if (cl->nodes != NULL)
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{
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tr_free(cl->nodes);
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}
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if (cl->nodes6 != NULL)
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{
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tr_free(cl->nodes6);
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}
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tr_free(closure);
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tr_logAddNamedDbg("DHT", "Finished bootstrapping");
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}
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int tr_dhtInit(tr_session* ss)
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{
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tr_variant benc;
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int rc;
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bool have_id = false;
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char* dat_file;
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uint8_t* nodes = NULL;
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uint8_t* nodes6 = NULL;
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uint8_t const* raw;
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size_t len = 0;
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size_t len6 = 0;
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struct bootstrap_closure* cl;
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if (session_ != NULL) /* already initialized */
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{
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return -1;
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}
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tr_logAddNamedDbg("DHT", "Initializing DHT");
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if (tr_env_key_exists("TR_DHT_VERBOSE"))
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{
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dht_debug = stderr;
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}
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dat_file = tr_buildPath(ss->configDir, "dht.dat", NULL);
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rc = tr_variantFromFile(&benc, TR_VARIANT_FMT_BENC, dat_file, NULL) ? 0 : -1;
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tr_free(dat_file);
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if (rc == 0)
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{
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have_id = tr_variantDictFindRaw(&benc, TR_KEY_id, &raw, &len);
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if (have_id && len == 20)
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{
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memcpy(myid, raw, len);
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}
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if (ss->udp_socket != TR_BAD_SOCKET && tr_variantDictFindRaw(&benc, TR_KEY_nodes, &raw, &len) && len % 6 == 0)
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{
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nodes = tr_memdup(raw, len);
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}
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if (ss->udp6_socket != TR_BAD_SOCKET && tr_variantDictFindRaw(&benc, TR_KEY_nodes6, &raw, &len6) && len6 % 18 == 0)
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{
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nodes6 = tr_memdup(raw, len6);
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}
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tr_variantFree(&benc);
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}
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if (nodes == NULL)
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{
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len = 0;
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}
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if (nodes6 == NULL)
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{
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len6 = 0;
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}
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if (have_id)
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{
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tr_logAddNamedInfo("DHT", "Reusing old id");
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}
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else
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{
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/* Note that DHT ids need to be distributed uniformly,
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* so it should be something truly random. */
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tr_logAddNamedInfo("DHT", "Generating new id");
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tr_rand_buffer(myid, 20);
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}
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rc = dht_init(ss->udp_socket, ss->udp6_socket, myid, NULL);
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if (rc < 0)
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{
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goto fail;
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}
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session_ = ss;
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cl = tr_new(struct bootstrap_closure, 1);
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cl->session = session_;
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cl->nodes = nodes;
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cl->nodes6 = nodes6;
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cl->len = len;
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cl->len6 = len6;
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tr_threadNew(dht_bootstrap, cl);
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dht_timer = evtimer_new(session_->event_base, timer_callback, session_);
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tr_timerAdd(dht_timer, 0, tr_rand_int_weak(1000000));
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tr_logAddNamedDbg("DHT", "DHT initialized");
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return 1;
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fail:
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tr_free(nodes6);
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tr_free(nodes);
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tr_logAddNamedDbg("DHT", "DHT initialization failed (errno = %d)", errno);
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session_ = NULL;
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return -1;
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}
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void tr_dhtUninit(tr_session* ss)
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{
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if (session_ != ss)
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{
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return;
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}
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tr_logAddNamedDbg("DHT", "Uninitializing DHT");
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if (dht_timer != NULL)
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{
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event_free(dht_timer);
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dht_timer = NULL;
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}
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/* Since we only save known good nodes, avoid erasing older data if we
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don't know enough nodes. */
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if (tr_dhtStatus(ss, AF_INET, NULL) < TR_DHT_FIREWALLED && tr_dhtStatus(ss, AF_INET6, NULL) < TR_DHT_FIREWALLED)
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{
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tr_logAddNamedInfo("DHT", "Not saving nodes, DHT not ready");
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}
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else
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{
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enum
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{
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MAX_NODES = 300,
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PORT_LEN = 2,
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COMPACT_ADDR_LEN = 4,
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COMPACT_LEN = (COMPACT_ADDR_LEN + PORT_LEN),
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COMPACT6_ADDR_LEN = 16,
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COMPACT6_LEN = (COMPACT6_ADDR_LEN + PORT_LEN),
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};
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struct sockaddr_in sins[MAX_NODES];
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struct sockaddr_in6 sins6[MAX_NODES];
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int num = MAX_NODES;
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int num6 = MAX_NODES;
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int n = dht_get_nodes(sins, &num, sins6, &num6);
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tr_logAddNamedInfo("DHT", "Saving %d (%d + %d) nodes", n, num, num6);
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tr_variant benc;
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tr_variantInitDict(&benc, 3);
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tr_variantDictAddRaw(&benc, TR_KEY_id, myid, 20);
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if (num > 0)
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{
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char compact[MAX_NODES * COMPACT_LEN];
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char* out = compact;
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for (struct sockaddr_in const* in = sins; in < sins + num; ++in)
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{
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memcpy(out, &in->sin_addr, COMPACT_ADDR_LEN);
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out += COMPACT_ADDR_LEN;
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memcpy(out, &in->sin_port, PORT_LEN);
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out += PORT_LEN;
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}
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tr_variantDictAddRaw(&benc, TR_KEY_nodes, compact, out - compact);
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}
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if (num6 > 0)
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{
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char compact6[MAX_NODES * COMPACT6_LEN];
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char* out6 = compact6;
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for (struct sockaddr_in6 const* in = sins6; in < sins6 + num6; ++in)
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{
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memcpy(out6, &in->sin6_addr, COMPACT6_ADDR_LEN);
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out6 += COMPACT6_ADDR_LEN;
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memcpy(out6, &in->sin6_port, PORT_LEN);
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out6 += PORT_LEN;
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}
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tr_variantDictAddRaw(&benc, TR_KEY_nodes6, compact6, out6 - compact6);
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}
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char* const dat_file = tr_buildPath(ss->configDir, "dht.dat", NULL);
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tr_variantToFile(&benc, TR_VARIANT_FMT_BENC, dat_file);
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tr_variantFree(&benc);
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tr_free(dat_file);
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}
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dht_uninit();
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tr_logAddNamedDbg("DHT", "Done uninitializing DHT");
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session_ = NULL;
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}
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bool tr_dhtEnabled(tr_session const* ss)
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{
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return ss != NULL && ss == session_;
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}
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struct getstatus_closure
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{
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int af;
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sig_atomic_t status;
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sig_atomic_t count;
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};
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static void getstatus(void* cl)
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{
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struct getstatus_closure* closure = cl;
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int good;
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int dubious;
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int incoming;
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dht_nodes(closure->af, &good, &dubious, NULL, &incoming);
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closure->count = good + dubious;
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if (good < 4 || good + dubious <= 8)
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{
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closure->status = TR_DHT_BROKEN;
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}
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else if (good < 40)
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{
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closure->status = TR_DHT_POOR;
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}
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else if (incoming < 8)
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{
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closure->status = TR_DHT_FIREWALLED;
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}
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else
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{
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closure->status = TR_DHT_GOOD;
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}
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}
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int tr_dhtStatus(tr_session* session, int af, int* nodes_return)
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{
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struct getstatus_closure closure = { .af = af, .status = -1, .count = -1 };
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if (!tr_dhtEnabled(session) || (af == AF_INET && session->udp_socket == TR_BAD_SOCKET) ||
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|
(af == AF_INET6 && session->udp6_socket == TR_BAD_SOCKET))
|
|
{
|
|
if (nodes_return != NULL)
|
|
{
|
|
*nodes_return = 0;
|
|
}
|
|
|
|
return TR_DHT_STOPPED;
|
|
}
|
|
|
|
tr_runInEventThread(session, getstatus, &closure);
|
|
|
|
while (closure.status < 0)
|
|
{
|
|
tr_wait_msec(50 /*msec*/);
|
|
}
|
|
|
|
if (nodes_return != NULL)
|
|
{
|
|
*nodes_return = closure.count;
|
|
}
|
|
|
|
return closure.status;
|
|
}
|
|
|
|
tr_port tr_dhtPort(tr_session* ss)
|
|
{
|
|
return tr_dhtEnabled(ss) ? ss->udp_port : 0;
|
|
}
|
|
|
|
bool tr_dhtAddNode(tr_session* ss, tr_address const* address, tr_port port, bool bootstrap)
|
|
{
|
|
int af = address->type == TR_AF_INET ? AF_INET : AF_INET6;
|
|
|
|
if (!tr_dhtEnabled(ss))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
/* Since we don't want to abuse our bootstrap nodes,
|
|
* we don't ping them if the DHT is in a good state. */
|
|
|
|
if (bootstrap && (tr_dhtStatus(ss, af, NULL) >= TR_DHT_FIREWALLED))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (address->type == TR_AF_INET)
|
|
{
|
|
struct sockaddr_in sin;
|
|
memset(&sin, 0, sizeof(sin));
|
|
sin.sin_family = AF_INET;
|
|
memcpy(&sin.sin_addr, &address->addr.addr4, 4);
|
|
sin.sin_port = htons(port);
|
|
dht_ping_node((struct sockaddr*)&sin, sizeof(sin));
|
|
return true;
|
|
}
|
|
else if (address->type == TR_AF_INET6)
|
|
{
|
|
struct sockaddr_in6 sin6;
|
|
memset(&sin6, 0, sizeof(sin6));
|
|
sin6.sin6_family = AF_INET6;
|
|
memcpy(&sin6.sin6_addr, &address->addr.addr6, 16);
|
|
sin6.sin6_port = htons(port);
|
|
dht_ping_node((struct sockaddr*)&sin6, sizeof(sin6));
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
char const* tr_dhtPrintableStatus(int status)
|
|
{
|
|
switch (status)
|
|
{
|
|
case TR_DHT_STOPPED:
|
|
return "stopped";
|
|
|
|
case TR_DHT_BROKEN:
|
|
return "broken";
|
|
|
|
case TR_DHT_POOR:
|
|
return "poor";
|
|
|
|
case TR_DHT_FIREWALLED:
|
|
return "firewalled";
|
|
|
|
case TR_DHT_GOOD:
|
|
return "good";
|
|
|
|
default:
|
|
return "???";
|
|
}
|
|
}
|
|
|
|
static void callback(void* ignore, int event, unsigned char const* info_hash, void const* data, size_t data_len)
|
|
{
|
|
TR_UNUSED(ignore);
|
|
|
|
if (event == DHT_EVENT_VALUES || event == DHT_EVENT_VALUES6)
|
|
{
|
|
tr_torrent* tor;
|
|
tr_sessionLock(session_);
|
|
tor = tr_torrentFindFromHash(session_, info_hash);
|
|
|
|
if (tor != NULL && tr_torrentAllowsDHT(tor))
|
|
{
|
|
size_t n;
|
|
tr_pex* pex;
|
|
|
|
if (event == DHT_EVENT_VALUES)
|
|
{
|
|
pex = tr_peerMgrCompactToPex(data, data_len, NULL, 0, &n);
|
|
}
|
|
else
|
|
{
|
|
pex = tr_peerMgrCompact6ToPex(data, data_len, NULL, 0, &n);
|
|
}
|
|
|
|
for (size_t i = 0; i < n; ++i)
|
|
{
|
|
tr_peerMgrAddPex(tor, TR_PEER_FROM_DHT, pex + i, -1);
|
|
}
|
|
|
|
tr_free(pex);
|
|
tr_logAddTorDbg(tor, "Learned %d %s peers from DHT", (int)n, event == DHT_EVENT_VALUES6 ? "IPv6" : "IPv4");
|
|
}
|
|
|
|
tr_sessionUnlock(session_);
|
|
}
|
|
else if (event == DHT_EVENT_SEARCH_DONE || event == DHT_EVENT_SEARCH_DONE6)
|
|
{
|
|
tr_torrent* tor = tr_torrentFindFromHash(session_, info_hash);
|
|
|
|
if (tor != NULL)
|
|
{
|
|
if (event == DHT_EVENT_SEARCH_DONE)
|
|
{
|
|
tr_logAddTorInfo(tor, "%s", "IPv4 DHT announce done");
|
|
tor->dhtAnnounceInProgress = false;
|
|
}
|
|
else
|
|
{
|
|
tr_logAddTorInfo(tor, "%s", "IPv6 DHT announce done");
|
|
tor->dhtAnnounce6InProgress = false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int tr_dhtAnnounce(tr_torrent* tor, int af, bool announce)
|
|
{
|
|
int rc;
|
|
int status;
|
|
int numnodes;
|
|
int ret = 0;
|
|
|
|
if (!tr_torrentAllowsDHT(tor))
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
status = tr_dhtStatus(tor->session, af, &numnodes);
|
|
|
|
if (status == TR_DHT_STOPPED)
|
|
{
|
|
/* Let the caller believe everything is all right. */
|
|
return 1;
|
|
}
|
|
|
|
if (status >= TR_DHT_POOR)
|
|
{
|
|
rc = dht_search(tor->info.hash, announce ? tr_sessionGetPeerPort(session_) : 0, af, callback, NULL);
|
|
|
|
if (rc >= 0)
|
|
{
|
|
tr_logAddTorInfo(
|
|
tor,
|
|
"Starting %s DHT announce (%s, %d nodes)",
|
|
af == AF_INET6 ? "IPv6" : "IPv4",
|
|
tr_dhtPrintableStatus(status),
|
|
numnodes);
|
|
|
|
if (af == AF_INET)
|
|
{
|
|
tor->dhtAnnounceInProgress = true;
|
|
}
|
|
else
|
|
{
|
|
tor->dhtAnnounce6InProgress = true;
|
|
}
|
|
|
|
ret = 1;
|
|
}
|
|
else
|
|
{
|
|
tr_logAddTorErr(
|
|
tor,
|
|
"%s DHT announce failed (%s, %d nodes): %s",
|
|
af == AF_INET6 ? "IPv6" : "IPv4",
|
|
tr_dhtPrintableStatus(status),
|
|
numnodes,
|
|
tr_strerror(errno));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
tr_logAddTorDbg(
|
|
tor,
|
|
"%s DHT not ready (%s, %d nodes)",
|
|
af == AF_INET6 ? "IPv6" : "IPv4",
|
|
tr_dhtPrintableStatus(status),
|
|
numnodes);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void tr_dhtUpkeep(tr_session* session)
|
|
{
|
|
tr_torrent* tor = NULL;
|
|
time_t const now = tr_time();
|
|
|
|
while ((tor = tr_torrentNext(session, tor)) != NULL)
|
|
{
|
|
if (!tor->isRunning || !tr_torrentAllowsDHT(tor))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
if (tor->dhtAnnounceAt <= now)
|
|
{
|
|
int const rc = tr_dhtAnnounce(tor, AF_INET, true);
|
|
|
|
tor->dhtAnnounceAt = now + ((rc == 0) ? 5 + tr_rand_int_weak(5) : 25 * 60 + tr_rand_int_weak(3 * 60));
|
|
}
|
|
|
|
if (tor->dhtAnnounce6At <= now)
|
|
{
|
|
int const rc = tr_dhtAnnounce(tor, AF_INET6, true);
|
|
|
|
tor->dhtAnnounce6At = now + ((rc == 0) ? 5 + tr_rand_int_weak(5) : 25 * 60 + tr_rand_int_weak(3 * 60));
|
|
}
|
|
}
|
|
}
|
|
|
|
void tr_dhtCallback(unsigned char* buf, int buflen, struct sockaddr* from, socklen_t fromlen, void* sv)
|
|
{
|
|
TR_ASSERT(tr_isSession(sv));
|
|
|
|
if (sv != session_)
|
|
{
|
|
return;
|
|
}
|
|
|
|
time_t tosleep;
|
|
int rc = dht_periodic(buf, buflen, from, fromlen, &tosleep, callback, NULL);
|
|
|
|
if (rc < 0)
|
|
{
|
|
if (errno == EINTR)
|
|
{
|
|
tosleep = 0;
|
|
}
|
|
else
|
|
{
|
|
tr_logAddNamedError("DHT", "dht_periodic failed: %s", tr_strerror(errno));
|
|
|
|
if (errno == EINVAL || errno == EFAULT)
|
|
{
|
|
abort();
|
|
}
|
|
|
|
tosleep = 1;
|
|
}
|
|
}
|
|
|
|
/* Being slightly late is fine,
|
|
and has the added benefit of adding some jitter. */
|
|
tr_timerAdd(dht_timer, (int)tosleep, tr_rand_int_weak(1000000));
|
|
}
|
|
|
|
static void timer_callback(evutil_socket_t s, short type, void* session)
|
|
{
|
|
TR_UNUSED(s);
|
|
TR_UNUSED(type);
|
|
|
|
tr_dhtCallback(NULL, 0, NULL, 0, session);
|
|
}
|
|
|
|
/* This function should return true when a node is blacklisted. We do
|
|
not support using a blacklist with the DHT in Transmission, since
|
|
massive (ab)use of this feature could harm the DHT. However, feel
|
|
free to add support to your private copy as long as you don't
|
|
redistribute it. */
|
|
|
|
int dht_blacklisted(struct sockaddr const* sa, int salen)
|
|
{
|
|
TR_UNUSED(sa);
|
|
TR_UNUSED(salen);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void dht_hash(void* hash_return, int hash_size, void const* v1, int len1, void const* v2, int len2, void const* v3, int len3)
|
|
{
|
|
unsigned char sha1[SHA_DIGEST_LENGTH];
|
|
tr_sha1(sha1, v1, len1, v2, len2, v3, len3, NULL);
|
|
memset(hash_return, 0, hash_size);
|
|
memcpy(hash_return, sha1, MIN(hash_size, SHA_DIGEST_LENGTH));
|
|
}
|
|
|
|
int dht_random_bytes(void* buf, size_t size)
|
|
{
|
|
tr_rand_buffer(buf, size);
|
|
return size;
|
|
}
|
|
|
|
int dht_sendto(int sockfd, void const* buf, int len, int flags, struct sockaddr const* to, int tolen)
|
|
{
|
|
return sendto(sockfd, buf, len, flags, to, tolen);
|
|
}
|
|
|
|
#if defined(_WIN32) && !defined(__MINGW32__)
|
|
|
|
int dht_gettimeofday(struct timeval* tv, struct timezone* tz)
|
|
{
|
|
TR_ASSERT(tz == NULL);
|
|
|
|
return tr_gettimeofday(tv);
|
|
}
|
|
|
|
#endif
|