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transmission/utils/show.c
Jordan Lee 3ea43ba778 fix const warnings 
In particular, in passing argv around as a "const char * const *"
instead of a "const char *".
2015-12-06 22:39:14 +00:00

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/*
* This file Copyright (C) 2012-2014 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
* $Id$
*/
#include <stdio.h> /* fprintf () */
#include <string.h> /* strcmp (), strchr (), memcmp () */
#include <stdlib.h> /* qsort () */
#include <time.h>
#define CURL_DISABLE_TYPECHECK /* otherwise -Wunreachable-code goes insane */
#include <curl/curl.h>
#include <event2/buffer.h>
#include <libtransmission/transmission.h>
#include <libtransmission/tr-getopt.h>
#include <libtransmission/utils.h>
#include <libtransmission/web.h> /* tr_webGetResponseStr () */
#include <libtransmission/variant.h>
#include <libtransmission/version.h>
#include "units.h"
#define MY_NAME "transmission-show"
#define TIMEOUT_SECS 30
static tr_option options[] =
{
{ 'm', "magnet", "Give a magnet link for the specified torrent", "m", 0, NULL },
{ 's', "scrape", "Ask the torrent's trackers how many peers are in the torrent's swarm", "s", 0, NULL },
{ 'V', "version", "Show version number and exit", "V", 0, NULL },
{ 0, NULL, NULL, NULL, 0, NULL }
};
static const char *
getUsage (void)
{
return "Usage: " MY_NAME " [options] <.torrent file>";
}
static bool magnetFlag = false;
static bool scrapeFlag = false;
static bool showVersion = false;
const char * filename = NULL;
static int
parseCommandLine (int argc, const char * const * argv)
{
int c;
const char * optarg;
while ((c = tr_getopt (getUsage (), argc, argv, options, &optarg)))
{
switch (c)
{
case 'm':
magnetFlag = true;
break;
case 's':
scrapeFlag = true;
break;
case 'V':
showVersion = true;
break;
case TR_OPT_UNK:
filename = optarg;
break;
default:
return 1;
}
}
return 0;
}
static void
doShowMagnet (const tr_info * inf)
{
char * str = tr_torrentInfoGetMagnetLink (inf);
printf ("%s", str);
tr_free (str);
}
static int
compare_files_by_name (const void * va, const void * vb)
{
const tr_file * a = * (const tr_file* const *)va;
const tr_file * b = * (const tr_file* const *)vb;
return strcmp (a->name, b->name);
}
static void
showInfo (const tr_info * inf)
{
unsigned int i;
char buf[128];
tr_file ** files;
int prevTier = -1;
/**
*** General Info
**/
printf ("GENERAL\n\n");
printf (" Name: %s\n", inf->name);
printf (" Hash: %s\n", inf->hashString);
printf (" Created by: %s\n", inf->creator ? inf->creator : "Unknown");
if (!inf->dateCreated)
{
printf (" Created on: Unknown\n");
}
else
{
struct tm tm = *localtime (&inf->dateCreated);
printf (" Created on: %s", asctime (&tm));
}
if (inf->comment && *inf->comment)
printf (" Comment: %s\n", inf->comment);
printf (" Piece Count: %d\n", inf->pieceCount);
printf (" Piece Size: %s\n", tr_formatter_mem_B (buf, inf->pieceSize, sizeof (buf)));
printf (" Total Size: %s\n", tr_formatter_size_B (buf, inf->totalSize, sizeof (buf)));
printf (" Privacy: %s\n", inf->isPrivate ? "Private torrent" : "Public torrent");
/**
*** Trackers
**/
printf ("\nTRACKERS\n");
for (i=0; i<inf->trackerCount; ++i)
{
if (prevTier != inf->trackers[i].tier)
{
prevTier = inf->trackers[i].tier;
printf ("\n Tier #%d\n", prevTier + 1);
}
printf (" %s\n", inf->trackers[i].announce);
}
/**
***
**/
if (inf->webseedCount > 0)
{
printf ("\nWEBSEEDS\n\n");
for (i=0; i<inf->webseedCount; ++i)
printf (" %s\n", inf->webseeds[i]);
}
/**
*** Files
**/
printf ("\nFILES\n\n");
files = tr_new (tr_file*, inf->fileCount);
for (i=0; i<inf->fileCount; ++i)
files[i] = &inf->files[i];
qsort (files, inf->fileCount, sizeof (tr_file*), compare_files_by_name);
for (i=0; i<inf->fileCount; ++i)
printf (" %s (%s)\n", files[i]->name, tr_formatter_size_B (buf, files[i]->length, sizeof (buf)));
tr_free (files);
}
static size_t
writeFunc (void * ptr, size_t size, size_t nmemb, void * buf)
{
const size_t byteCount = size * nmemb;
evbuffer_add (buf, ptr, byteCount);
return byteCount;
}
static CURL*
tr_curl_easy_init (struct evbuffer * writebuf)
{
CURL * curl = curl_easy_init ();
curl_easy_setopt (curl, CURLOPT_USERAGENT, MY_NAME "/" LONG_VERSION_STRING);
curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, writeFunc);
curl_easy_setopt (curl, CURLOPT_WRITEDATA, writebuf);
curl_easy_setopt (curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl_easy_setopt (curl, CURLOPT_VERBOSE, tr_env_key_exists ("TR_CURL_VERBOSE"));
curl_easy_setopt (curl, CURLOPT_ENCODING, "");
return curl;
}
static void
doScrape (const tr_info * inf)
{
unsigned int i;
for (i=0; i<inf->trackerCount; ++i)
{
CURL * curl;
CURLcode res;
struct evbuffer * buf;
const char * scrape = inf->trackers[i].scrape;
char * url;
char escaped[SHA_DIGEST_LENGTH*3 + 1];
if (scrape == NULL)
continue;
tr_http_escape_sha1 (escaped, inf->hash);
url = tr_strdup_printf ("%s%cinfo_hash=%s",
scrape,
strchr (scrape, '?') ? '&' : '?',
escaped);
printf ("%s ... ", url);
fflush (stdout);
buf = evbuffer_new ();
curl = tr_curl_easy_init (buf);
curl_easy_setopt (curl, CURLOPT_URL, url);
curl_easy_setopt (curl, CURLOPT_TIMEOUT, TIMEOUT_SECS);
if ((res = curl_easy_perform (curl)))
{
printf ("error: %s\n", curl_easy_strerror (res));
}
else
{
long response;
curl_easy_getinfo (curl, CURLINFO_RESPONSE_CODE, &response);
if (response != 200)
{
printf ("error: unexpected response %ld \"%s\"\n",
response,
tr_webGetResponseStr (response));
}
else /* HTTP OK */
{
tr_variant top;
tr_variant * files;
bool matched = false;
const char * begin = (const char*) evbuffer_pullup (buf, -1);
if (!tr_variantFromBenc (&top, begin, evbuffer_get_length(buf)))
{
if (tr_variantDictFindDict (&top, TR_KEY_files, &files))
{
int i = 0;
tr_quark key;
tr_variant * val;
while (tr_variantDictChild (files, i++, &key, &val))
{
if (!memcmp (inf->hash, tr_quark_get_string(key,NULL), SHA_DIGEST_LENGTH))
{
int64_t seeders = -1;
int64_t leechers = -1;
tr_variantDictFindInt (val, TR_KEY_complete, &seeders);
tr_variantDictFindInt (val, TR_KEY_incomplete, &leechers);
printf ("%d seeders, %d leechers\n", (int)seeders, (int)leechers);
matched = true;
}
}
}
tr_variantFree (&top);
}
if (!matched)
printf ("no match\n");
}
}
curl_easy_cleanup (curl);
evbuffer_free (buf);
tr_free (url);
}
}
int
tr_main (int argc,
char * argv[])
{
int err;
tr_info inf;
tr_ctor * ctor;
tr_logSetLevel (TR_LOG_ERROR);
tr_formatter_mem_init (MEM_K, MEM_K_STR, MEM_M_STR, MEM_G_STR, MEM_T_STR);
tr_formatter_size_init (DISK_K, DISK_K_STR, DISK_M_STR, DISK_G_STR, DISK_T_STR);
tr_formatter_speed_init (SPEED_K, SPEED_K_STR, SPEED_M_STR, SPEED_G_STR, SPEED_T_STR);
if (parseCommandLine (argc, (const char* const *)argv))
return EXIT_FAILURE;
if (showVersion)
{
fprintf (stderr, MY_NAME" "LONG_VERSION_STRING"\n");
return EXIT_SUCCESS;
}
/* make sure the user specified a filename */
if (!filename)
{
fprintf (stderr, "ERROR: No .torrent file specified.\n");
tr_getopt_usage (MY_NAME, getUsage (), options);
fprintf (stderr, "\n");
return EXIT_FAILURE;
}
/* try to parse the .torrent file */
ctor = tr_ctorNew (NULL);
tr_ctorSetMetainfoFromFile (ctor, filename);
err = tr_torrentParse (ctor, &inf);
tr_ctorFree (ctor);
if (err)
{
fprintf (stderr, "Error parsing .torrent file \"%s\"\n", filename);
return EXIT_FAILURE;
}
if (magnetFlag)
{
doShowMagnet (&inf);
}
else
{
printf ("Name: %s\n", inf.name);
printf ("File: %s\n", filename);
printf ("\n");
fflush (stdout);
if (scrapeFlag)
doScrape (&inf);
else
showInfo (&inf);
}
/* cleanup */
putc ('\n', stdout);
tr_metainfoFree (&inf);
return EXIT_SUCCESS;
}
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