245 lines
6.7 KiB
C
245 lines
6.7 KiB
C
/*
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* This file Copyright (C) 2010-2014 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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* $Id$
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*/
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#include <assert.h>
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#include <string.h> /* strchr () */
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#include <stdio.h> /* sscanf () */
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#include "transmission.h"
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#include "crypto-utils.h" /* tr_hex_to_sha1 () */
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#include "magnet.h"
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#include "variant.h"
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#include "web.h"
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/***
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****
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***/
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/* this base32 code converted from code by Robert Kaye and Gordon Mohr
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* and is public domain. see http://bitzi.com/publicdomain for more info */
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static const int base32Lookup[] =
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{
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0xFF,0xFF,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F, /* '0', '1', '2', '3', '4', '5', '6', '7' */
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0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, /* '8', '9', ':', ';', '<', '=', '>', '?' */
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0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06, /* '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G' */
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0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E, /* 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O' */
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0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16, /* 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W' */
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0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF, /* 'X', 'Y', 'Z', '[', '\', ']', '^', '_' */
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0xFF,0x00,0x01,0x02,0x03,0x04,0x05,0x06, /* '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g' */
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0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E, /* 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o' */
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0x0F,0x10,0x11,0x12,0x13,0x14,0x15,0x16, /* 'p', 'q', 'r', 's', 't', 'u', 'v', 'w' */
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0x17,0x18,0x19,0xFF,0xFF,0xFF,0xFF,0xFF /* 'x', 'y', 'z', '{', '|', '}', '~', 'DEL' */
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};
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static const int base32LookupLen = sizeof (base32Lookup) / sizeof (base32Lookup[0]);
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static void
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base32_to_sha1 (uint8_t * out, const char * in, const size_t inlen)
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{
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const size_t outlen = 20;
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size_t i, index, offset;
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memset (out, 0, 20);
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assert (inlen == 32);
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for (i=0, index=0, offset=0; i<inlen; ++i)
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{
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int digit;
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int lookup = in[i] - '0';
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/* Skip chars outside the lookup table */
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if (lookup<0 || lookup>=base32LookupLen)
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continue;
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/* If this digit is not in the table, ignore it */
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digit = base32Lookup[lookup];
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if (digit == 0xFF)
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continue;
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if (index <= 3)
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{
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index = (index + 5) % 8;
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if (index == 0)
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{
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out[offset] |= digit;
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offset++;
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if (offset >= outlen)
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break;
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}
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else
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{
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out[offset] |= digit << (8 - index);
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}
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}
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else
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{
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index = (index + 5) % 8;
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out[offset] |= (digit >> index);
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offset++;
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if (offset >= outlen)
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break;
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out[offset] |= digit << (8 - index);
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}
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}
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}
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/***
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****
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***/
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#define MAX_TRACKERS 64
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#define MAX_WEBSEEDS 64
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tr_magnet_info *
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tr_magnetParse (const char * uri)
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{
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bool got_checksum = false;
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int trCount = 0;
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int wsCount = 0;
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char * tr[MAX_TRACKERS];
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char * ws[MAX_WEBSEEDS];
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char * displayName = NULL;
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uint8_t sha1[SHA_DIGEST_LENGTH];
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tr_magnet_info * info = NULL;
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if ((uri != NULL) && !memcmp (uri, "magnet:?", 8))
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{
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const char * walk;
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for (walk=uri+8; walk && *walk;)
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{
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const char * key = walk;
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const char * delim = strchr (key, '=');
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const char * val = delim == NULL ? NULL : delim + 1;
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const char * next = strchr (delim == NULL ? key : val, '&');
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size_t keylen, vallen;
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if (delim != NULL)
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keylen = (size_t) (delim - key);
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else if (next != NULL)
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keylen = (size_t) (next - key);
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else
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keylen = strlen (key);
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if (val == NULL)
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vallen = 0;
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else if (next != NULL)
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vallen = (size_t) (next - val);
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else
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vallen = strlen (val);
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if ((keylen==2) && !memcmp (key, "xt", 2) && val && !memcmp (val, "urn:btih:", 9))
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{
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const char * hash = val + 9;
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const size_t hashlen = vallen - 9;
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if (hashlen == 40)
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{
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tr_hex_to_sha1 (sha1, hash);
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got_checksum = true;
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}
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else if (hashlen == 32)
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{
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base32_to_sha1 (sha1, hash, hashlen);
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got_checksum = true;
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}
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}
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if ((vallen > 0) && (keylen==2) && !memcmp (key, "dn", 2))
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displayName = tr_http_unescape (val, vallen);
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if ((vallen > 0) && (trCount < MAX_TRACKERS))
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{
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int i;
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if ((keylen==2) && !memcmp (key, "tr", 2))
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tr[trCount++] = tr_http_unescape (val, vallen);
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else if ((sscanf (key, "tr.%d=", &i) == 1) && (i >= 0)) /* ticket #3341 and #5134 */
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tr[trCount++] = tr_http_unescape (val, vallen);
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}
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if ((vallen > 0) && (keylen==2) && !memcmp (key, "ws", 2) && (wsCount < MAX_WEBSEEDS))
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ws[wsCount++] = tr_http_unescape (val, vallen);
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walk = next != NULL ? next + 1 : NULL;
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}
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}
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if (got_checksum)
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{
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info = tr_new0 (tr_magnet_info, 1);
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info->displayName = displayName;
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info->trackerCount = trCount;
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info->trackers = tr_memdup (tr, sizeof (char*) * trCount);
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info->webseedCount = wsCount;
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info->webseeds = tr_memdup (ws, sizeof (char*) * wsCount);
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memcpy (info->hash, sha1, sizeof (uint8_t) * SHA_DIGEST_LENGTH);
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}
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return info;
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}
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void
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tr_magnetFree (tr_magnet_info * info)
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{
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if (info != NULL)
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{
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int i;
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for (i=0; i<info->trackerCount; ++i)
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tr_free (info->trackers[i]);
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tr_free (info->trackers);
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for (i=0; i<info->webseedCount; ++i)
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tr_free (info->webseeds[i]);
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tr_free (info->webseeds);
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tr_free (info->displayName);
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tr_free (info);
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}
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}
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void
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tr_magnetCreateMetainfo (const tr_magnet_info * info, tr_variant * top)
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{
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int i;
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tr_variant * d;
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tr_variantInitDict (top, 4);
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/* announce list */
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if (info->trackerCount == 1)
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{
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tr_variantDictAddStr (top, TR_KEY_announce, info->trackers[0]);
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}
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else
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{
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tr_variant * trackers = tr_variantDictAddList (top, TR_KEY_announce_list, info->trackerCount);
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for (i=0; i<info->trackerCount; ++i)
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tr_variantListAddStr (tr_variantListAddList (trackers, 1), info->trackers[i]);
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}
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/* webseeds */
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if (info->webseedCount > 0)
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{
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tr_variant * urls = tr_variantDictAddList (top, TR_KEY_url_list, info->webseedCount);
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for (i=0; i<info->webseedCount; ++i)
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tr_variantListAddStr (urls, info->webseeds[i]);
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}
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/* nonstandard keys */
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d = tr_variantDictAddDict (top, TR_KEY_magnet_info, 2);
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tr_variantDictAddRaw (d, TR_KEY_info_hash, info->hash, 20);
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if (info->displayName != NULL)
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tr_variantDictAddStr (d, TR_KEY_display_name, info->displayName);
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}
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