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transmission/libtransmission/announcer-http.c

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/*
* This file Copyright (C) Mnemosyne LLC
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2 (b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <limits.h> /* USHRT_MAX */
#include <stdio.h> /* fprintf () */
#include <stdlib.h> /* getenv () */
#include <string.h> /* strchr (), memcmp (), memcpy () */
#include <event2/buffer.h>
#include <event2/http.h> /* for HTTP_OK */
#define __LIBTRANSMISSION_ANNOUNCER_MODULE___
#include "transmission.h"
#include "announcer-common.h"
#include "net.h" /* tr_globalIPv6 () */
#include "peer-mgr.h" /* pex */
#include "torrent.h"
#include "trevent.h" /* tr_runInEventThread () */
#include "utils.h"
#include "variant.h"
#include "web.h" /* tr_http_escape () */
#define dbgmsg(name, ...) \
if (tr_deepLoggingIsActive ()) do { \
tr_deepLog (__FILE__, __LINE__, name, __VA_ARGS__); \
} while (0)
/****
*****
***** ANNOUNCE
*****
****/
static const char*
get_event_string (const tr_announce_request * req)
{
if (req->partial_seed)
if (req->event != TR_ANNOUNCE_EVENT_STOPPED)
return "paused";
return tr_announce_event_get_string (req->event);
}
static char*
announce_url_new (const tr_session * session, const tr_announce_request * req)
{
const char * str;
const unsigned char * ipv6;
struct evbuffer * buf = evbuffer_new ();
char escaped_info_hash[SHA_DIGEST_LENGTH*3 + 1];
tr_http_escape_sha1 (escaped_info_hash, req->info_hash);
evbuffer_expand (buf, 1024);
evbuffer_add_printf (buf, "%s"
"%c"
"info_hash=%s"
"&peer_id=%*.*s"
"&port=%d"
"&uploaded=%" PRIu64
"&downloaded=%" PRIu64
"&left=%" PRIu64
"&numwant=%d"
"&key=%x"
"&compact=1"
"&supportcrypto=1",
req->url,
strchr (req->url, '?') ? '&' : '?',
escaped_info_hash,
PEER_ID_LEN, PEER_ID_LEN, req->peer_id,
req->port,
req->up,
req->down,
req->leftUntilComplete,
req->numwant,
req->key);
if (session->encryptionMode == TR_ENCRYPTION_REQUIRED)
evbuffer_add_printf (buf, "&requirecrypto=1");
if (req->corrupt)
evbuffer_add_printf (buf, "&corrupt=%" PRIu64, req->corrupt);
str = get_event_string (req);
if (str && *str)
evbuffer_add_printf (buf, "&event=%s", str);
str = req->tracker_id_str;
if (str && *str)
evbuffer_add_printf (buf, "&trackerid=%s", str);
/* There are two incompatible techniques for announcing an IPv6 address.
BEP-7 suggests adding an "ipv6=" parameter to the announce URL,
while OpenTracker requires that peers announce twice, once over IPv4
and once over IPv6.
To be safe, we should do both: add the "ipv6=" parameter and
announce twice. At any rate, we're already computing our IPv6
address (for the LTEP handshake), so this comes for free. */
ipv6 = tr_globalIPv6 ();
if (ipv6) {
char ipv6_readable[INET6_ADDRSTRLEN];
evutil_inet_ntop (AF_INET6, ipv6, ipv6_readable, INET6_ADDRSTRLEN);
evbuffer_add_printf (buf, "&ipv6=");
tr_http_escape (buf, ipv6_readable, -1, true);
}
return evbuffer_free_to_str (buf);
}
static tr_pex*
listToPex (tr_variant * peerList, size_t * setme_len)
{
size_t i;
size_t n;
const size_t len = tr_variantListSize (peerList);
tr_pex * pex = tr_new0 (tr_pex, len);
for (i=n=0; i<len; ++i)
{
int64_t port;
const char * ip;
tr_address addr;
tr_variant * peer = tr_variantListChild (peerList, i);
if (peer == NULL)
continue;
if (!tr_variantDictFindStr (peer, "ip", &ip, NULL))
continue;
if (!tr_address_from_string (&addr, ip))
continue;
if (!tr_variantDictFindInt (peer, "port", &port))
continue;
if ((port < 0) || (port > USHRT_MAX))
continue;
if (!tr_address_is_valid_for_peers (&addr, port))
continue;
pex[n].addr = addr;
pex[n].port = htons ((uint16_t)port);
++n;
}
*setme_len = n;
return pex;
}
struct announce_data
{
tr_announce_response response;
tr_announce_response_func * response_func;
void * response_func_user_data;
char log_name[128];
};
static void
on_announce_done_eventthread (void * vdata)
{
struct announce_data * data = vdata;
if (data->response_func != NULL)
data->response_func (&data->response, data->response_func_user_data);
tr_free (data->response.pex6);
tr_free (data->response.pex);
tr_free (data->response.tracker_id_str);
tr_free (data->response.warning);
tr_free (data->response.errmsg);
tr_free (data);
}
static void
on_announce_done (tr_session * session,
bool did_connect,
bool did_timeout,
long response_code,
const void * msg,
size_t msglen,
void * vdata)
{
tr_announce_response * response;
struct announce_data * data = vdata;
response = &data->response;
response->did_connect = did_connect;
response->did_timeout = did_timeout;
dbgmsg (data->log_name, "Got announce response");
if (response_code != HTTP_OK)
{
const char * fmt = _("Tracker gave HTTP response code %1$ld (%2$s)");
const char * response_str = tr_webGetResponseStr (response_code);
response->errmsg = tr_strdup_printf (fmt, response_code, response_str);
}
else
{
tr_variant benc;
const bool variant_loaded = !tr_variantFromBenc (&benc, msg, msglen);
if (getenv ("TR_CURL_VERBOSE") != NULL)
{
if (!variant_loaded)
fprintf (stderr, "%s", "Announce response was not in benc format\n");
else {
int i, len;
char * str = tr_variantToStr (&benc, TR_VARIANT_FMT_JSON, &len);
fprintf (stderr, "%s", "Announce response:\n< ");
for (i=0; i<len; ++i)
fputc (str[i], stderr);
fputc ('\n', stderr);
tr_free (str);
}
}
if (variant_loaded && tr_variantIsDict (&benc))
{
int64_t i;
size_t len;
tr_variant * tmp;
const char * str;
const uint8_t * raw;
if (tr_variantDictFindStr (&benc, "failure reason", &str, &len))
response->errmsg = tr_strndup (str, len);
if (tr_variantDictFindStr (&benc, "warning message", &str, &len))
response->warning = tr_strndup (str, len);
if (tr_variantDictFindInt (&benc, "interval", &i))
response->interval = i;
if (tr_variantDictFindInt (&benc, "min interval", &i))
response->min_interval = i;
if (tr_variantDictFindStr (&benc, "tracker id", &str, &len))
response->tracker_id_str = tr_strndup (str, len);
if (tr_variantDictFindInt (&benc, "complete", &i))
response->seeders = i;
if (tr_variantDictFindInt (&benc, "incomplete", &i))
response->leechers = i;
if (tr_variantDictFindInt (&benc, "downloaded", &i))
response->downloads = i;
if (tr_variantDictFindRaw (&benc, "peers6", &raw, &len)) {
dbgmsg (data->log_name, "got a peers6 length of %zu", len);
response->pex6 = tr_peerMgrCompact6ToPex (raw, len,
NULL, 0, &response->pex6_count);
}
if (tr_variantDictFindRaw (&benc, "peers", &raw, &len)) {
dbgmsg (data->log_name, "got a compact peers length of %zu", len);
response->pex = tr_peerMgrCompactToPex (raw, len,
NULL, 0, &response->pex_count);
} else if (tr_variantDictFindList (&benc, "peers", &tmp)) {
response->pex = listToPex (tmp, &response->pex_count);
dbgmsg (data->log_name, "got a peers list with %zu entries",
response->pex_count);
}
}
if (variant_loaded)
tr_variantFree (&benc);
}
tr_runInEventThread (session, on_announce_done_eventthread, data);
}
void
tr_tracker_http_announce (tr_session * session,
const tr_announce_request * request,
tr_announce_response_func response_func,
void * response_func_user_data)
{
struct announce_data * d;
char * url = announce_url_new (session, request);
d = tr_new0 (struct announce_data, 1);
d->response.seeders = -1;
d->response.leechers = -1;
d->response.downloads = -1;
d->response_func = response_func;
d->response_func_user_data = response_func_user_data;
memcpy (d->response.info_hash, request->info_hash, SHA_DIGEST_LENGTH);
tr_strlcpy (d->log_name, request->log_name, sizeof (d->log_name));
dbgmsg (request->log_name, "Sending announce to libcurl: \"%s\"", url);
tr_webRun (session, url, NULL, NULL, on_announce_done, d);
tr_free (url);
}
/****
*****
***** SCRAPE
*****
****/
struct scrape_data
{
tr_scrape_response response;
tr_scrape_response_func * response_func;
void * response_func_user_data;
char log_name[128];
};
static void
on_scrape_done_eventthread (void * vdata)
{
struct scrape_data * data = vdata;
if (data->response_func != NULL)
data->response_func (&data->response, data->response_func_user_data);
tr_free (data->response.errmsg);
tr_free (data->response.url);
tr_free (data);
}
static void
on_scrape_done (tr_session * session,
bool did_connect,
bool did_timeout,
long response_code,
const void * msg,
size_t msglen,
void * vdata)
{
tr_scrape_response * response;
struct scrape_data * data = vdata;
response = &data->response;
response->did_connect = did_connect;
response->did_timeout = did_timeout;
dbgmsg (data->log_name, "Got scrape response for \"%s\"", response->url);
if (response_code != HTTP_OK)
{
const char * fmt = _("Tracker gave HTTP response code %1$ld (%2$s)");
const char * response_str = tr_webGetResponseStr (response_code);
response->errmsg = tr_strdup_printf (fmt, response_code, response_str);
}
else
{
tr_variant top;
int64_t intVal;
tr_variant * files;
tr_variant * flags;
size_t len;
const char * str;
const bool variant_loaded = !tr_variantFromBenc (&top, msg, msglen);
if (getenv ("TR_CURL_VERBOSE") != NULL)
{
if (!variant_loaded)
fprintf (stderr, "%s", "Scrape response was not in benc format\n");
else {
int i, len;
char * str = tr_variantToStr (&top, TR_VARIANT_FMT_JSON, &len);
fprintf (stderr, "%s", "Scrape response:\n< ");
for (i=0; i<len; ++i)
fputc (str[i], stderr);
fputc ('\n', stderr);
tr_free (str);
}
}
if (variant_loaded)
{
if (tr_variantDictFindStr (&top, "failure reason", &str, &len))
response->errmsg = tr_strndup (str, len);
if (tr_variantDictFindDict (&top, "flags", &flags))
if (tr_variantDictFindInt (flags, "min_request_interval", &intVal))
response->min_request_interval = intVal;
if (tr_variantDictFindDict (&top, "files", &files))
{
int i = 0;
for (;;)
{
int j;
tr_variant * val;
const char * key;
/* get the next "file" */
if (!tr_variantDictChild (files, i++, &key, &val))
break;
/* populate the corresponding row in our response array */
for (j=0; j<response->row_count; ++j)
{
struct tr_scrape_response_row * row = &response->rows[j];
if (!memcmp (key, row->info_hash, SHA_DIGEST_LENGTH))
{
if (tr_variantDictFindInt (val, "complete", &intVal))
row->seeders = intVal;
if (tr_variantDictFindInt (val, "incomplete", &intVal))
row->leechers = intVal;
if (tr_variantDictFindInt (val, "downloaded", &intVal))
row->downloads = intVal;
if (tr_variantDictFindInt (val, "downloaders", &intVal))
row->downloaders = intVal;
break;
}
}
}
}
tr_variantFree (&top);
}
}
tr_runInEventThread (session, on_scrape_done_eventthread, data);
}
static char *
scrape_url_new (const tr_scrape_request * req)
{
int i;
char delimiter;
struct evbuffer * buf = evbuffer_new ();
evbuffer_add_printf (buf, "%s", req->url);
delimiter = strchr (req->url, '?') ? '&' : '?';
for (i=0; i<req->info_hash_count; ++i)
{
char str[SHA_DIGEST_LENGTH*3 + 1];
tr_http_escape_sha1 (str, req->info_hash[i]);
evbuffer_add_printf (buf, "%cinfo_hash=%s", delimiter, str);
delimiter = '&';
}
return evbuffer_free_to_str (buf);
}
void
tr_tracker_http_scrape (tr_session * session,
const tr_scrape_request * request,
tr_scrape_response_func response_func,
void * response_func_user_data)
{
int i;
struct scrape_data * d;
char * url = scrape_url_new (request);
d = tr_new0 (struct scrape_data, 1);
d->response.url = tr_strdup (request->url);
d->response_func = response_func;
d->response_func_user_data = response_func_user_data;
d->response.row_count = request->info_hash_count;
for (i=0; i<d->response.row_count; ++i)
{
memcpy (d->response.rows[i].info_hash, request->info_hash[i], SHA_DIGEST_LENGTH);
d->response.rows[i].seeders = -1;
d->response.rows[i].leechers = -1;
d->response.rows[i].downloads = -1;
}
tr_strlcpy (d->log_name, request->log_name, sizeof (d->log_name));
dbgmsg (request->log_name, "Sending scrape to libcurl: \"%s\"", url);
tr_webRun (session, url, NULL, NULL, on_scrape_done, d);
tr_free (url);
}
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