opentracker – An open and free bittorrent tracker
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/* This software was written by Dirk Engling <erdgeist@erdgeist.org>
It is considered beerware. Prost. Skol. Cheers or whatever.
$id$ */
/* System */
#include <arpa/inet.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/* Libowfat */
#include "array.h"
#include "byte.h"
#include "io.h"
#include "iob.h"
#include "ip6.h"
/* Opentracker */
#include "ot_accesslist.h"
#include "ot_clean.h"
#include "ot_fullscrape.h"
#include "ot_http.h"
#include "ot_livesync.h"
#include "ot_mutex.h"
#include "ot_stats.h"
#include "ot_vector.h"
#include "trackerlogic.h"
/* Forward declaration */
size_t return_peers_for_torrent(struct ot_workstruct *ws, ot_torrent *torrent, size_t amount, char *reply, PROTO_FLAG proto);
void free_peerlist(ot_peerlist *peer_list) {
if (peer_list->peers.data) {
if (OT_PEERLIST_HASBUCKETS(peer_list))
vector_clean_list((ot_vector *)peer_list->peers.data, peer_list->peers.size);
else
free(peer_list->peers.data);
}
free(peer_list);
}
void add_torrent_from_saved_state(ot_hash const hash, ot_time base, size_t down_count) {
int exactmatch;
ot_torrent *torrent;
ot_vector *torrents_list = mutex_bucket_lock_by_hash(hash);
if (!accesslist_hashisvalid(hash))
return mutex_bucket_unlock_by_hash(hash, 0);
torrent = vector_find_or_insert(torrents_list, (void *)hash, sizeof(ot_torrent), OT_HASH_COMPARE_SIZE, &exactmatch);
if (!torrent || exactmatch)
return mutex_bucket_unlock_by_hash(hash, 0);
/* Create a new torrent entry, then */
byte_zero(torrent, sizeof(ot_torrent));
memcpy(torrent->hash, hash, sizeof(ot_hash));
if (!(torrent->peer_list6 = malloc(sizeof(ot_peerlist))) || !(torrent->peer_list4 = malloc(sizeof(ot_peerlist)))) {
vector_remove_torrent(torrents_list, torrent);
return mutex_bucket_unlock_by_hash(hash, 0);
}
byte_zero(torrent->peer_list6, sizeof(ot_peerlist));
byte_zero(torrent->peer_list4, sizeof(ot_peerlist));
torrent->peer_list6->base = base;
torrent->peer_list4->base = base;
torrent->peer_list6->down_count = down_count;
torrent->peer_list4->down_count = down_count;
return mutex_bucket_unlock_by_hash(hash, 1);
}
size_t add_peer_to_torrent_and_return_peers(PROTO_FLAG proto, struct ot_workstruct *ws, size_t amount) {
int exactmatch, delta_torrentcount = 0;
ot_torrent *torrent;
ot_peer *peer_dest;
ot_vector *torrents_list = mutex_bucket_lock_by_hash(*ws->hash);
ot_peerlist *peer_list;
size_t peer_size; /* initialized in next line */
ot_peer const *peer_src = peer_from_peer6(&ws->peer, &peer_size);
if (!accesslist_hashisvalid(*ws->hash)) {
mutex_bucket_unlock_by_hash(*ws->hash, 0);
if (proto == FLAG_TCP) {
const char invalid_hash[] = "d14:failure reason63:Requested download is not authorized for use with this tracker.e";
memcpy(ws->reply, invalid_hash, strlen(invalid_hash));
return strlen(invalid_hash);
}
return 0;
}
torrent = vector_find_or_insert(torrents_list, (void *)ws->hash, sizeof(ot_torrent), OT_HASH_COMPARE_SIZE, &exactmatch);
if (!torrent) {
mutex_bucket_unlock_by_hash(*ws->hash, 0);
return 0;
}
if (!exactmatch) {
/* Create a new torrent entry, then */
byte_zero(torrent, sizeof(ot_torrent));
memcpy(torrent->hash, *ws->hash, sizeof(ot_hash));
if (!(torrent->peer_list6 = malloc(sizeof(ot_peerlist))) || !(torrent->peer_list4 = malloc(sizeof(ot_peerlist)))) {
vector_remove_torrent(torrents_list, torrent);
mutex_bucket_unlock_by_hash(*ws->hash, 0);
return 0;
}
byte_zero(torrent->peer_list6, sizeof(ot_peerlist));
byte_zero(torrent->peer_list4, sizeof(ot_peerlist));
delta_torrentcount = 1;
} else
clean_single_torrent(torrent);
torrent->peer_list6->base = g_now_minutes;
torrent->peer_list4->base = g_now_minutes;
peer_list = peer_size == OT_PEER_SIZE6 ? torrent->peer_list6 : torrent->peer_list4;
/* Check for peer in torrent */
peer_dest = vector_find_or_insert_peer(&(peer_list->peers), peer_src, peer_size, &exactmatch);
if (!peer_dest) {
mutex_bucket_unlock_by_hash(*ws->hash, delta_torrentcount);
return 0;
}
/* Tell peer that it's fresh */
OT_PEERTIME(ws->peer, OT_PEER_SIZE6) = 0;
/* Sanitize flags: Whoever claims to have completed download, must be a seeder */
if ((OT_PEERFLAG(ws->peer) & (PEER_FLAG_COMPLETED | PEER_FLAG_SEEDING)) == PEER_FLAG_COMPLETED)
OT_PEERFLAG(ws->peer) ^= PEER_FLAG_COMPLETED;
/* If we hadn't had a match create peer there */
if (!exactmatch) {
#ifdef WANT_SYNC_LIVE
if (proto == FLAG_MCA)
OT_PEERFLAG(ws->peer) |= PEER_FLAG_FROM_SYNC;
else
livesync_tell(ws);
#endif
peer_list->peer_count++;
if (OT_PEERFLAG(ws->peer) & PEER_FLAG_COMPLETED) {
peer_list->down_count++;
stats_issue_event(EVENT_COMPLETED, 0, (uintptr_t)ws);
}
if (OT_PEERFLAG(ws->peer) & PEER_FLAG_SEEDING)
peer_list->seed_count++;
} else {
stats_issue_event(EVENT_RENEW, 0, OT_PEERTIME(peer_dest, peer_size));
#ifdef WANT_SPOT_WOODPECKER
if ((OT_PEERTIME(peer_dest, peer_size) > 0) && (OT_PEERTIME(peer_dest, peer_size) < 20))
stats_issue_event(EVENT_WOODPECKER, 0, (uintptr_t)&ws->peer);
#endif
#ifdef WANT_SYNC_LIVE
/* Won't live sync peers that come back too fast. Only exception:
fresh "completed" reports */
if (proto != FLAG_MCA) {
if (OT_PEERTIME(peer_dest, peer_size) > OT_CLIENT_SYNC_RENEW_BOUNDARY ||
(!(OT_PEERFLAG_D(peer_dest, peer_size) & PEER_FLAG_COMPLETED) && (OT_PEERFLAG(ws->peer) & PEER_FLAG_COMPLETED)))
livesync_tell(ws);
}
#endif
if ((OT_PEERFLAG_D(peer_dest, peer_size) & PEER_FLAG_SEEDING) && !(OT_PEERFLAG(ws->peer) & PEER_FLAG_SEEDING))
peer_list->seed_count--;
if (!(OT_PEERFLAG_D(peer_dest, peer_size) & PEER_FLAG_SEEDING) && (OT_PEERFLAG(ws->peer) & PEER_FLAG_SEEDING))
peer_list->seed_count++;
if (!(OT_PEERFLAG_D(peer_dest, peer_size) & PEER_FLAG_COMPLETED) && (OT_PEERFLAG(ws->peer) & PEER_FLAG_COMPLETED)) {
peer_list->down_count++;
stats_issue_event(EVENT_COMPLETED, 0, (uintptr_t)ws);
}
if (OT_PEERFLAG_D(peer_dest, peer_size) & PEER_FLAG_COMPLETED)
OT_PEERFLAG(ws->peer) |= PEER_FLAG_COMPLETED;
}
memcpy(peer_dest, peer_src, peer_size);
#ifdef WANT_SYNC
if (proto == FLAG_MCA) {
mutex_bucket_unlock_by_hash(*ws->hash, delta_torrentcount);
return 0;
}
#endif
ws->reply_size = return_peers_for_torrent(ws, torrent, amount, ws->reply, proto);
mutex_bucket_unlock_by_hash(*ws->hash, delta_torrentcount);
return ws->reply_size;
}
static size_t return_peers_all(ot_peerlist *peer_list, size_t peer_size, char *reply) {
unsigned int bucket, num_buckets = 1;
ot_vector *bucket_list = &peer_list->peers;
size_t compare_size = OT_PEER_COMPARE_SIZE_FROM_PEER_SIZE(peer_size);
size_t result = compare_size * peer_list->peer_count;
char *r_end = reply + result;
if (OT_PEERLIST_HASBUCKETS(peer_list)) {
num_buckets = bucket_list->size;
bucket_list = (ot_vector *)bucket_list->data;
}
for (bucket = 0; bucket < num_buckets; ++bucket) {
ot_peer *peers = bucket_list[bucket].data;
size_t peer_count = bucket_list[bucket].size;
while (peer_count--) {
if (OT_PEERFLAG_D(peers, peer_size) & PEER_FLAG_SEEDING) {
r_end -= compare_size;
memcpy(r_end, peers, compare_size);
} else {
memcpy(reply, peers, compare_size);
reply += compare_size;
}
peers += peer_size;
}
}
return result;
}
static size_t return_peers_selection(struct ot_workstruct *ws, ot_peerlist *peer_list, size_t peer_size, size_t amount, char *reply) {
unsigned int bucket_offset, bucket_index = 0, num_buckets = 1;
ot_vector *bucket_list = &peer_list->peers;
unsigned int shifted_pc = peer_list->peer_count;
unsigned int shifted_step = 0;
unsigned int shift = 0;
size_t compare_size = OT_PEER_COMPARE_SIZE_FROM_PEER_SIZE(peer_size);
size_t result = compare_size * amount;
char *r_end = reply + result;
if (OT_PEERLIST_HASBUCKETS(peer_list)) {
num_buckets = bucket_list->size;
bucket_list = (ot_vector *)bucket_list->data;
}
/* Make fixpoint arithmetic as exact as possible */
#define MAXPRECBIT (1 << (8 * sizeof(int) - 3))
while (!(shifted_pc & MAXPRECBIT)) {
shifted_pc <<= 1;
shift++;
}
shifted_step = shifted_pc / amount;
#undef MAXPRECBIT
/* Initialize somewhere in the middle of peers so that
fixpoint's aliasing doesn't alway miss the same peers */
bucket_offset = nrand48(ws->rand48_state) % peer_list->peer_count;
while (amount--) {
ot_peer *peer;
/* This is the aliased, non shifted range, next value may fall into */
unsigned int diff = (((amount + 1) * shifted_step) >> shift) - ((amount * shifted_step) >> shift);
bucket_offset += 1 + nrand48(ws->rand48_state) % diff;
while (bucket_offset >= bucket_list[bucket_index].size) {
bucket_offset -= bucket_list[bucket_index].size;
bucket_index = (bucket_index + 1) % num_buckets;
}
peer = bucket_list[bucket_index].data + peer_size * bucket_offset;
if (OT_PEERFLAG_D(peer, peer_size) & PEER_FLAG_SEEDING) {
r_end -= compare_size;
memcpy(r_end, peer, compare_size);
} else {
memcpy(reply, peer, compare_size);
reply += compare_size;
}
}
return result;
}
static size_t return_peers_for_torrent_udp(struct ot_workstruct *ws, ot_torrent *torrent, size_t amount, char *reply) {
char *r = reply;
size_t peer_size = peer_size_from_peer6(&ws->peer);
ot_peerlist *peer_list = peer_size == OT_PEER_SIZE6 ? torrent->peer_list6 : torrent->peer_list4;
size_t peer_count = torrent->peer_list6->peer_count + torrent->peer_list4->peer_count;
size_t seed_count = torrent->peer_list6->seed_count + torrent->peer_list4->seed_count;
if (amount > peer_list->peer_count)
amount = peer_list->peer_count;
*(uint32_t *)(r + 0) = htonl(OT_CLIENT_REQUEST_INTERVAL_RANDOM);
*(uint32_t *)(r + 4) = htonl(peer_count - seed_count);
*(uint32_t *)(r + 8) = htonl(seed_count);
r += 12;
if (amount) {
if (amount == peer_list->peer_count)
r += return_peers_all(peer_list, peer_size, r);
else
r += return_peers_selection(ws, peer_list, peer_size, amount, r);
}
return r - reply;
}
static size_t return_peers_for_torrent_tcp(struct ot_workstruct *ws, ot_torrent *torrent, size_t amount, char *reply) {
char *r = reply;
int erval = OT_CLIENT_REQUEST_INTERVAL_RANDOM;
size_t seed_count = torrent->peer_list6->seed_count + torrent->peer_list4->seed_count;
size_t down_count = torrent->peer_list6->down_count + torrent->peer_list4->down_count;
size_t peer_count = torrent->peer_list6->peer_count + torrent->peer_list4->peer_count - seed_count;
/* Simple case: amount of peers in both lists is less than requested, here we return all results */
size_t amount_v4 = torrent->peer_list4->peer_count;
size_t amount_v6 = torrent->peer_list6->peer_count;
/* Complex case: both lists have more than enough entries and we need to split between v4 and v6 clients */
if (amount_v4 + amount_v6 > amount) {
size_t amount_left, percent_v6 = 0, percent_v4 = 0, left_v6, left_v4;
const size_t SCALE = 1024;
/* If possible, fill at least a quarter of peer from each family */
if (amount / 4 <= amount_v4)
amount_v4 = amount / 4;
if (amount / 4 <= amount_v6)
amount_v6 = amount / 4;
/* Fill the rest according to which family's pool provides more peers */
amount_left = amount - (amount_v4 + amount_v6);
left_v4 = torrent->peer_list4->peer_count - amount_v4;
left_v6 = torrent->peer_list6->peer_count - amount_v6;
if (left_v4 + left_v6) {
percent_v4 = (SCALE * left_v4) / (left_v4 + left_v6);
percent_v6 = (SCALE * left_v6) / (left_v4 + left_v6);
}
amount_v4 += (amount_left * percent_v4) / SCALE;
amount_v6 += (amount_left * percent_v6) / SCALE;
/* Integer division rounding can leave out a peer */
if (amount_v4 + amount_v6 < amount && amount_v6 < torrent->peer_list6->peer_count)
++amount_v6;
if (amount_v4 + amount_v6 < amount && amount_v4 < torrent->peer_list4->peer_count)
++amount_v4;
}
r +=
sprintf(r, "d8:completei%zde10:downloadedi%zde10:incompletei%zde8:intervali%ie12:min intervali%ie", seed_count, down_count, peer_count, erval, erval / 2);
if (amount_v4) {
r += sprintf(r, PEERS_BENCODED4 "%zd:", OT_PEER_COMPARE_SIZE4 * amount_v4);
if (amount_v4 == torrent->peer_list4->peer_count)
r += return_peers_all(torrent->peer_list4, OT_PEER_SIZE4, r);
else
r += return_peers_selection(ws, torrent->peer_list4, OT_PEER_SIZE4, amount_v4, r);
}
if (amount_v6) {
r += sprintf(r, PEERS_BENCODED6 "%zd:", OT_PEER_COMPARE_SIZE6 * amount_v6);
if (amount_v6 == torrent->peer_list6->peer_count)
r += return_peers_all(torrent->peer_list6, OT_PEER_SIZE6, r);
else
r += return_peers_selection(ws, torrent->peer_list6, OT_PEER_SIZE6, amount_v6, r);
}
*r++ = 'e';
return r - reply;
}
/* Compiles a list of random peers for a torrent
* Reply must have enough space to hold:
* 92 + 6 * amount bytes for TCP/IPv4
* 92 + 18 * amount bytes for TCP/IPv6
* 12 + 6 * amount bytes for UDP/IPv4
* 12 + 18 * amount bytes for UDP/IPv6
* Does not yet check not to return self
*/
size_t return_peers_for_torrent(struct ot_workstruct *ws, ot_torrent *torrent, size_t amount, char *reply, PROTO_FLAG proto) {
return proto == FLAG_TCP ? return_peers_for_torrent_tcp(ws, torrent, amount, reply) : return_peers_for_torrent_udp(ws, torrent, amount, reply);
}
/* Fetches scrape info for a specific torrent */
size_t return_udp_scrape_for_torrent(ot_hash const hash, char *reply) {
int exactmatch, delta_torrentcount = 0;
ot_vector *torrents_list = mutex_bucket_lock_by_hash(hash);
ot_torrent *torrent = binary_search(hash, torrents_list->data, torrents_list->size, sizeof(ot_torrent), OT_HASH_COMPARE_SIZE, &exactmatch);
if (!exactmatch) {
memset(reply, 0, 12);
} else {
uint32_t *r = (uint32_t *)reply;
if (clean_single_torrent(torrent)) {
vector_remove_torrent(torrents_list, torrent);
memset(reply, 0, 12);
delta_torrentcount = -1;
} else {
r[0] = htonl(torrent->peer_list6->seed_count + torrent->peer_list4->seed_count);
r[1] = htonl(torrent->peer_list6->down_count + torrent->peer_list4->down_count);
r[2] = htonl(torrent->peer_list6->peer_count + torrent->peer_list4->peer_count - torrent->peer_list6->seed_count - torrent->peer_list4->seed_count);
}
}
mutex_bucket_unlock_by_hash(hash, delta_torrentcount);
return 12;
}
/* Fetches scrape info for a specific torrent */
size_t return_tcp_scrape_for_torrent(ot_hash const *hash_list, int amount, char *reply) {
char *r = reply;
int exactmatch, i;
r += sprintf(r, "d5:filesd");
for (i = 0; i < amount; ++i) {
int delta_torrentcount = 0;
ot_hash const *hash = hash_list + i;
ot_vector *torrents_list = mutex_bucket_lock_by_hash(*hash);
ot_torrent *torrent = binary_search(hash, torrents_list->data, torrents_list->size, sizeof(ot_torrent), OT_HASH_COMPARE_SIZE, &exactmatch);
if (exactmatch) {
if (clean_single_torrent(torrent)) {
vector_remove_torrent(torrents_list, torrent);
delta_torrentcount = -1;
} else {
*r++ = '2';
*r++ = '0';
*r++ = ':';
memcpy(r, hash, sizeof(ot_hash));
r += sizeof(ot_hash);
r += sprintf(r, "d8:completei%zde10:downloadedi%zde10:incompletei%zdee", torrent->peer_list6->seed_count + torrent->peer_list4->seed_count,
torrent->peer_list6->down_count + torrent->peer_list4->down_count,
torrent->peer_list6->peer_count + torrent->peer_list4->peer_count - torrent->peer_list6->seed_count - torrent->peer_list4->seed_count);
}
}
mutex_bucket_unlock_by_hash(*hash, delta_torrentcount);
}
*r++ = 'e';
*r++ = 'e';
return r - reply;
}
static ot_peerlist dummy_list;
size_t remove_peer_from_torrent(PROTO_FLAG proto, struct ot_workstruct *ws) {
int exactmatch;
ot_vector *torrents_list = mutex_bucket_lock_by_hash(*ws->hash);
ot_torrent *torrent = binary_search(ws->hash, torrents_list->data, torrents_list->size, sizeof(ot_torrent), OT_HASH_COMPARE_SIZE, &exactmatch);
ot_peerlist *peer_list = &dummy_list;
size_t peer_size; /* initialized in next line */
ot_peer const *peer_src = peer_from_peer6(&ws->peer, &peer_size);
size_t peer_count = 0, seed_count = 0;
#ifdef WANT_SYNC_LIVE
if (proto != FLAG_MCA) {
OT_PEERFLAG(ws->peer) |= PEER_FLAG_STOPPED;
livesync_tell(ws);
}
#endif
if (exactmatch) {
peer_list = peer_size == OT_PEER_SIZE6 ? torrent->peer_list6 : torrent->peer_list4;
switch (vector_remove_peer(&peer_list->peers, peer_src, peer_size)) {
case 2:
peer_list->seed_count--; /* Intentional fallthrough */
case 1:
peer_list->peer_count--; /* Intentional fallthrough */
default:
break;
}
peer_count = torrent->peer_list6->peer_count + torrent->peer_list4->peer_count;
seed_count = torrent->peer_list6->seed_count + torrent->peer_list4->seed_count;
}
if (proto == FLAG_TCP) {
int erval = OT_CLIENT_REQUEST_INTERVAL_RANDOM;
ws->reply_size = sprintf(ws->reply, "d8:completei%zde10:incompletei%zde8:intervali%ie12:min intervali%ie%s0:e", seed_count, peer_count - seed_count, erval,
erval / 2, peer_size == OT_PEER_SIZE6 ? PEERS_BENCODED6 : PEERS_BENCODED4);
}
/* Handle UDP reply */
if (proto == FLAG_UDP) {
((uint32_t *)ws->reply)[2] = htonl(OT_CLIENT_REQUEST_INTERVAL_RANDOM);
((uint32_t *)ws->reply)[3] = htonl(peer_count - seed_count);
((uint32_t *)ws->reply)[4] = htonl(seed_count);
ws->reply_size = 20;
}
mutex_bucket_unlock_by_hash(*ws->hash, 0);
return ws->reply_size;
}
void iterate_all_torrents(int (*for_each)(ot_torrent *torrent, uintptr_t data), uintptr_t data) {
int bucket;
size_t j;
for (bucket = 0; bucket < OT_BUCKET_COUNT; ++bucket) {
ot_vector *torrents_list = mutex_bucket_lock(bucket);
ot_torrent *torrents = (ot_torrent *)(torrents_list->data);
for (j = 0; j < torrents_list->size; ++j)
if (for_each(torrents + j, data))
break;
mutex_bucket_unlock(bucket, 0);
if (!g_opentracker_running)
return;
}
}
ot_peer *peer_from_peer6(ot_peer6 *peer, size_t *peer_size) {
ot_ip6 *ip = (ot_ip6 *)peer;
if (!ip6_isv4mapped(ip)) {
*peer_size = OT_PEER_SIZE6;
return (ot_peer *)peer;
}
*peer_size = OT_PEER_SIZE4;
return (ot_peer *)(((uint8_t *)peer) + 12);
}
size_t peer_size_from_peer6(ot_peer6 *peer) {
ot_ip6 *ip = (ot_ip6 *)peer;
if (!ip6_isv4mapped(ip))
return OT_PEER_SIZE6;
return OT_PEER_SIZE4;
}
#ifdef _DEBUG_RANDOMTORRENTS
void trackerlogic_add_random_torrents(size_t amount) {
struct ot_workstruct ws;
memset(&ws, 0, sizeof(ws));
ws.inbuf = malloc(G_INBUF_SIZE);
ws.outbuf = malloc(G_OUTBUF_SIZE);
ws.reply = ws.outbuf;
ws.hash = (ot_hash *)ws.inbuf;
while (amount--) {
arc4random_buf(ws.hash, sizeof(ot_hash));
arc4random_buf(&ws.peer, sizeof(ws.peer));
OT_PEERFLAG(ws.peer) &= PEER_FLAG_SEEDING | PEER_FLAG_COMPLETED | PEER_FLAG_STOPPED;
add_peer_to_torrent_and_return_peers(FLAG_TCP, &ws, 1);
}
free(ws.inbuf);
free(ws.outbuf);
}
#endif
void exerr(char *message) {
fprintf(stderr, "%s\n", message);
exit(111);
}
void trackerlogic_init() {
g_tracker_id = random();
if (!g_stats_path)
g_stats_path = "stats";
g_stats_path_len = strlen(g_stats_path);
/* Initialise background worker threads */
mutex_init();
clean_init();
fullscrape_init();
accesslist_init();
livesync_init();
stats_init();
}
void trackerlogic_deinit(void) {
int bucket, delta_torrentcount = 0;
size_t j;
/* Free all torrents... */
for (bucket = 0; bucket < OT_BUCKET_COUNT; ++bucket) {
ot_vector *torrents_list = mutex_bucket_lock(bucket);
if (torrents_list->size) {
for (j = 0; j < torrents_list->size; ++j) {
ot_torrent *torrent = ((ot_torrent *)(torrents_list->data)) + j;
free_peerlist(torrent->peer_list6);
free_peerlist(torrent->peer_list4);
delta_torrentcount -= 1;
}
free(torrents_list->data);
}
mutex_bucket_unlock(bucket, delta_torrentcount);
}
/* Deinitialise background worker threads */
stats_deinit();
livesync_deinit();
accesslist_deinit();
fullscrape_deinit();
clean_deinit();
/* Release mutexes */
mutex_deinit();
}
const char *g_version_trackerlogic_c = "$Source$: $Revision$\n";