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opentracker/ot_http.c

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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 <sys/types.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
/* Libowfat */
#include "byte.h"
#include "array.h"
#include "iob.h"
/* Opentracker */
#include "trackerlogic.h"
#include "ot_mutex.h"
#include "ot_http.h"
#include "ot_iovec.h"
#include "scan_urlencoded_query.h"
#include "ot_fullscrape.h"
#include "ot_stats.h"
#include "ot_accesslist.h"
#define OT_MAXMULTISCRAPE_COUNT 64
static ot_hash multiscrape_buf[OT_MAXMULTISCRAPE_COUNT];
extern char *g_redirecturl;
enum {
SUCCESS_HTTP_HEADER_LENGTH = 80,
SUCCESS_HTTP_HEADER_LENGHT_CONTENT_ENCODING = 32,
SUCCESS_HTTP_SIZE_OFF = 17 };
/* Our static output buffer */
static char static_outbuf[8192];
#ifdef _DEBUG_HTTPERROR
static char debug_request[8192];
#endif
static void http_senddata( const int64 client_socket, char *buffer, size_t size ) {
struct http_data *h = io_getcookie( client_socket );
ssize_t written_size;
/* whoever sends data is not interested in its input-array */
if( h && ( h->flag & STRUCT_HTTP_FLAG_ARRAY_USED ) ) {
h->flag &= ~STRUCT_HTTP_FLAG_ARRAY_USED;
array_reset( &h->request );
}
written_size = write( client_socket, buffer, size );
if( ( written_size < 0 ) || ( (size_t)written_size == size ) ) {
free( h ); io_close( client_socket );
} else {
char * outbuf;
tai6464 t;
if( !h ) return;
if( !( outbuf = malloc( size - written_size ) ) ) {
free(h); io_close( client_socket );
return;
}
iob_reset( &h->batch );
memmove( outbuf, buffer + written_size, size - written_size );
iob_addbuf_free( &h->batch, outbuf, size - written_size );
h->flag |= STRUCT_HTTP_FLAG_IOB_USED;
/* writeable short data sockets just have a tcp timeout */
taia_uint( &t, 0 ); io_timeout( client_socket, t );
io_dontwantread( client_socket );
io_wantwrite( client_socket );
}
}
#define HTTPERROR_302 return http_issue_error( client_socket, CODE_HTTPERROR_302 )
#define HTTPERROR_400 return http_issue_error( client_socket, CODE_HTTPERROR_400 )
#define HTTPERROR_400_PARAM return http_issue_error( client_socket, CODE_HTTPERROR_400_PARAM )
#define HTTPERROR_400_COMPACT return http_issue_error( client_socket, CODE_HTTPERROR_400_COMPACT )
#define HTTPERROR_403_IP return http_issue_error( client_socket, CODE_HTTPERROR_403_IP )
#define HTTPERROR_404 return http_issue_error( client_socket, CODE_HTTPERROR_404 )
#define HTTPERROR_500 return http_issue_error( client_socket, CODE_HTTPERROR_500 )
ssize_t http_issue_error( const int64 client_socket, int code ) {
char *error_code[] = { "302 Found", "400 Invalid Request", "400 Invalid Request", "400 Invalid Request",
"403 Access Denied", "404 Not Found", "500 Internal Server Error" };
char *title = error_code[code];
size_t reply_size;
if( code == CODE_HTTPERROR_302 )
reply_size = sprintf( static_outbuf, "HTTP/1.0 302 Found\r\nContent-Length: 0\r\nLocation: %s\r\n\r\n", g_redirecturl );
else
reply_size = sprintf( static_outbuf, "HTTP/1.0 %s\r\nContent-Type: text/html\r\nConnection: close\r\nContent-Length: %zd\r\n\r\n<title>%s</title>\n", title, strlen(title)+16-4,title+4);
#ifdef _DEBUG_HTTPERROR
fprintf( stderr, "DEBUG: invalid request was: %s\n", debug_request );
#endif
stats_issue_event( EVENT_FAILED, FLAG_TCP, code );
http_senddata( client_socket, static_outbuf, reply_size);
return -2;
}
ssize_t http_sendiovecdata( const int64 client_socket, int iovec_entries, struct iovec *iovector ) {
struct http_data *h = io_getcookie( client_socket );
char *header;
int i;
size_t header_size, size = iovec_length( &iovec_entries, &iovector );
tai6464 t;
/* No cookie? Bad socket. Leave. */
if( !h ) {
iovec_free( &iovec_entries, &iovector );
HTTPERROR_500;
}
/* If this socket collected request in a buffer,
free it now */
if( h->flag & STRUCT_HTTP_FLAG_ARRAY_USED ) {
h->flag &= ~STRUCT_HTTP_FLAG_ARRAY_USED;
array_reset( &h->request );
}
/* If we came here, wait for the answer is over */
h->flag &= ~STRUCT_HTTP_FLAG_WAITINGFORTASK;
/* Our answers never are 0 vectors. Return an error. */
if( !iovec_entries ) {
HTTPERROR_500;
}
/* Prepare space for http header */
header = malloc( SUCCESS_HTTP_HEADER_LENGTH + SUCCESS_HTTP_HEADER_LENGHT_CONTENT_ENCODING );
if( !header ) {
iovec_free( &iovec_entries, &iovector );
HTTPERROR_500;
}
if( h->flag & STRUCT_HTTP_FLAG_GZIP )
header_size = sprintf( header, "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\nContent-Encoding: gzip\r\nContent-Length: %zd\r\n\r\n", size );
else if( h->flag & STRUCT_HTTP_FLAG_BZIP2 )
header_size = sprintf( header, "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\nContent-Encoding: bzip2\r\nContent-Length: %zd\r\n\r\n", size );
else
header_size = sprintf( header, "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\nContent-Length: %zd\r\n\r\n", size );
iob_reset( &h->batch );
iob_addbuf_free( &h->batch, header, header_size );
/* Will move to ot_iovec.c */
for( i=0; i<iovec_entries; ++i )
iob_addbuf_munmap( &h->batch, iovector[i].iov_base, iovector[i].iov_len );
free( iovector );
h->flag |= STRUCT_HTTP_FLAG_IOB_USED;
/* writeable sockets timeout after twice the pool timeout
which defaults to 5 minutes (e.g. after 10 minutes) */
taia_now( &t ); taia_addsec( &t, &t, OT_CLIENT_TIMEOUT_SEND );
io_timeout( client_socket, t );
io_dontwantread( client_socket );
io_wantwrite( client_socket );
return 0;
}
static ssize_t http_handle_stats( const int64 client_socket, char *data, char *d, size_t l ) {
char *c = data;
int mode = TASK_STATS_PEERS, scanon = 1, format = 0;
#ifdef WANT_RESTRICT_STATS
struct http_data *h = io_getcookie( client_socket );
if( !accesslist_isblessed( h->ip, OT_PERMISSION_MAY_STAT ) )
HTTPERROR_403_IP;
#endif
while( scanon ) {
switch( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_PARAM ) ) {
case -2: scanon = 0; break; /* TERMINATOR */
case -1: HTTPERROR_400_PARAM; /* PARSE ERROR */
default: scan_urlencoded_skipvalue( &c ); break;
case 4:
if( byte_diff(data,4,"mode")) {
scan_urlencoded_skipvalue( &c );
continue;
}
switch( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) ) {
case 4:
if( !byte_diff(data,4,"peer"))
mode = TASK_STATS_PEERS;
else if( !byte_diff(data,4,"conn"))
mode = TASK_STATS_CONNS;
else if( !byte_diff(data,4,"scrp"))
mode = TASK_STATS_SCRAPE;
else if( !byte_diff(data,4,"tcp4"))
mode = TASK_STATS_TCP;
else if( !byte_diff(data,4,"udp4"))
mode = TASK_STATS_UDP;
else if( !byte_diff(data,4,"busy"))
mode = TASK_STATS_BUSY_NETWORKS;
else if( !byte_diff(data,4,"torr"))
mode = TASK_STATS_TORRENTS;
else if( !byte_diff(data,4,"fscr"))
mode = TASK_STATS_FULLSCRAPE;
else if( !byte_diff(data,4,"s24s"))
mode = TASK_STATS_SLASH24S;
else if( !byte_diff(data,4,"tpbs"))
mode = TASK_STATS_TPB;
else if( !byte_diff(data,4,"herr"))
mode = TASK_STATS_HTTPERRORS;
else
HTTPERROR_400_PARAM;
break;
case 5:
if( !byte_diff(data,5,"top10"))
mode = TASK_STATS_TOP10;
else if( !byte_diff(data,5,"renew"))
mode = TASK_STATS_RENEW;
else if( !byte_diff(data,5,"syncs"))
mode = TASK_STATS_SYNCS;
else
HTTPERROR_400_PARAM;
break;
case 7:
if( !byte_diff(data,7,"version"))
mode = TASK_STATS_VERSION;
else
HTTPERROR_400_PARAM;
break;
case 9:
if( !byte_diff(data,9,"startstop"))
mode = TASK_STATS_STARTSTOP;
else if( !byte_diff(data,9,"toraddrem"))
mode = TASK_STATS_TORADDREM;
else
HTTPERROR_400_PARAM;
break;
}
case 6:
if( byte_diff(data,6,"format")) {
scan_urlencoded_skipvalue( &c );
continue;
}
if( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) != 3 ) HTTPERROR_400_PARAM;
if( !byte_diff(data,3,"bin"))
format = TASK_FULLSCRAPE_TPB_BINARY;
else if( !byte_diff(data,3,"ben"))
format = TASK_FULLSCRAPE;
else if( !byte_diff(data,3,"url"))
format = TASK_FULLSCRAPE_TPB_URLENCODED;
else if( !byte_diff(data,3,"txt"))
format = TASK_FULLSCRAPE_TPB_ASCII;
else
HTTPERROR_400_PARAM;
break;
}
}
/* Touch variable */
d=d;
#ifdef WANT_FULLSCRAPE
if( mode == TASK_STATS_TPB ) {
struct http_data* h = io_getcookie( client_socket );
tai6464 t;
#ifdef WANT_COMPRESSION_GZIP
d[l-1] = 0;
if( strstr( d, "gzip" ) ) {
h->flag |= STRUCT_HTTP_FLAG_GZIP;
format |= TASK_FLAG_GZIP;
}
#endif
/* Pass this task to the worker thread */
h->flag |= STRUCT_HTTP_FLAG_WAITINGFORTASK;
/* Clients waiting for us should not easily timeout */
taia_uint( &t, 0 ); io_timeout( client_socket, t );
fullscrape_deliver( client_socket, format );
io_dontwantread( client_socket );
return -2;
}
#endif
/* default format for now */
if( ( mode & TASK_CLASS_MASK ) == TASK_STATS ) {
tai6464 t;
/* Complex stats also include expensive memory debugging tools */
taia_uint( &t, 0 ); io_timeout( client_socket, t );
stats_deliver( client_socket, mode );
return -2;
}
/* Simple stats can be answerred immediately */
if( !( l = return_stats_for_tracker( static_outbuf + SUCCESS_HTTP_HEADER_LENGTH, mode, 0 ) ) ) HTTPERROR_500;
return l;
}
#ifdef WANT_FULLSCRAPE
static ssize_t http_handle_fullscrape( const int64 client_socket, char *d, size_t l ) {
struct http_data* h = io_getcookie( client_socket );
int format = 0;
tai6464 t;
/* Touch variables */
d=d;l=l;
#ifdef WANT_COMPRESSION_GZIP
d[l-1] = 0;
if( strstr( d, "gzip" ) ) {
h->flag |= STRUCT_HTTP_FLAG_GZIP;
format = TASK_FLAG_GZIP;
stats_issue_event( EVENT_FULLSCRAPE_REQUEST_GZIP, *(int*)h->ip, 0 );
} else
#endif
stats_issue_event( EVENT_FULLSCRAPE_REQUEST, *(int*)h->ip, 0 );
#ifdef _DEBUG_HTTPERROR
write( 2, debug_request, l );
#endif
/* Pass this task to the worker thread */
h->flag |= STRUCT_HTTP_FLAG_WAITINGFORTASK;
/* Clients waiting for us should not easily timeout */
taia_uint( &t, 0 ); io_timeout( client_socket, t );
fullscrape_deliver( client_socket, TASK_FULLSCRAPE | format );
io_dontwantread( client_socket );
return -2;
}
#endif
static ssize_t http_handle_scrape( const int64 client_socket, char *data ) {
int scanon = 1, numwant = 0;
char *c = data;
size_t l;
/* This is to hack around stupid clients that send "scrape ?info_hash" */
if( c[-1] != '?' ) {
while( ( *c != '?' ) && ( *c != '\n' ) ) ++c;
if( *c == '\n' ) HTTPERROR_400_PARAM;
++c;
}
while( scanon ) {
switch( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_PARAM ) ) {
case -2: scanon = 0; break; /* TERMINATOR */
case -1:
if( numwant )
goto UTORRENT1600_WORKAROUND;
HTTPERROR_400_PARAM; /* PARSE ERROR */
default: scan_urlencoded_skipvalue( &c ); break;
case 9:
if(byte_diff(data,9,"info_hash")) {
scan_urlencoded_skipvalue( &c );
continue;
}
/* ignore this, when we have less than 20 bytes */
if( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) != (ssize_t)sizeof(ot_hash) ) {
#ifdef WANT_UTORRENT1600_WORKAROUND
if( data[20] != '?' )
#endif
HTTPERROR_400_PARAM;
}
if( numwant < OT_MAXMULTISCRAPE_COUNT )
memmove( multiscrape_buf + numwant++, data, sizeof(ot_hash) );
break;
}
}
UTORRENT1600_WORKAROUND:
/* No info_hash found? Inform user */
if( !numwant ) HTTPERROR_400_PARAM;
/* Enough for http header + whole scrape string */
if( !( l = return_tcp_scrape_for_torrent( multiscrape_buf, numwant, SUCCESS_HTTP_HEADER_LENGTH + static_outbuf ) ) ) HTTPERROR_500;
stats_issue_event( EVENT_SCRAPE, FLAG_TCP, l );
return l;
}
static ssize_t http_handle_announce( const int64 client_socket, char *data ) {
char *c = data;
int numwant, tmp, scanon;
ot_peer peer;
ot_torrent *torrent;
ot_hash *hash = NULL;
unsigned short port = htons(6881);
ssize_t len;
/* This is to hack around stupid clients that send "announce ?info_hash" */
if( c[-1] != '?' ) {
while( ( *c != '?' ) && ( *c != '\n' ) ) ++c;
if( *c == '\n' ) HTTPERROR_400_PARAM;
++c;
}
OT_SETIP( &peer, ((struct http_data*)io_getcookie( client_socket ) )->ip );
OT_SETPORT( &peer, &port );
OT_FLAG( &peer ) = 0;
numwant = 50;
scanon = 1;
while( scanon ) {
switch( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_PARAM ) ) {
case -2: scanon = 0; break; /* TERMINATOR */
case -1: HTTPERROR_400_PARAM; /* PARSE ERROR */
default: scan_urlencoded_skipvalue( &c ); break;
#ifdef WANT_IP_FROM_QUERY_STRING
case 2:
if(!byte_diff(data,2,"ip")) {
unsigned char ip[4];
len = scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE );
if( ( len <= 0 ) || scan_fixed_ip( data, len, ip ) ) HTTPERROR_400_PARAM;
OT_SETIP( &peer, ip );
} else
scan_urlencoded_skipvalue( &c );
break;
#endif
case 4:
if( !byte_diff( data, 4, "port" ) ) {
len = scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE );
if( ( len <= 0 ) || scan_fixed_int( data, len, &tmp ) || ( tmp > 0xffff ) ) HTTPERROR_400_PARAM;
port = htons( tmp ); OT_SETPORT( &peer, &port );
} else if( !byte_diff( data, 4, "left" ) ) {
if( ( len = scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) ) <= 0 ) HTTPERROR_400_PARAM;
if( scan_fixed_int( data, len, &tmp ) ) tmp = 0;
if( !tmp ) OT_FLAG( &peer ) |= PEER_FLAG_SEEDING;
} else
scan_urlencoded_skipvalue( &c );
break;
case 5:
if( byte_diff( data, 5, "event" ) )
scan_urlencoded_skipvalue( &c );
else switch( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) ) {
case -1:
HTTPERROR_400_PARAM;
case 7:
if( !byte_diff( data, 7, "stopped" ) ) OT_FLAG( &peer ) |= PEER_FLAG_STOPPED;
break;
case 9:
if( !byte_diff( data, 9, "completed" ) ) OT_FLAG( &peer ) |= PEER_FLAG_COMPLETED;
default: /* Fall through intended */
break;
}
break;
case 7:
if(!byte_diff(data,7,"numwant")) {
len = scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE );
if( ( len <= 0 ) || scan_fixed_int( data, len, &numwant ) ) HTTPERROR_400_PARAM;
if( numwant < 0 ) numwant = 50;
if( numwant > 200 ) numwant = 200;
} else if(!byte_diff(data,7,"compact")) {
len = scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE );
if( ( len <= 0 ) || scan_fixed_int( data, len, &tmp ) ) HTTPERROR_400_PARAM;
if( !tmp ) HTTPERROR_400_COMPACT;
} else
scan_urlencoded_skipvalue( &c );
break;
case 9:
if(byte_diff(data,9,"info_hash")) {
scan_urlencoded_skipvalue( &c );
continue;
}
/* ignore this, when we have less than 20 bytes */
if( scan_urlencoded_query( &c, data = c, SCAN_SEARCHPATH_VALUE ) != 20 ) HTTPERROR_400_PARAM;
hash = (ot_hash*)data;
break;
}
}
/* Scanned whole query string */
if( !hash )
return sprintf( static_outbuf + SUCCESS_HTTP_HEADER_LENGTH, "d14:failure reason80:Your client forgot to send your torrent's info_hash. Please upgrade your client.e" );
if( OT_FLAG( &peer ) & PEER_FLAG_STOPPED )
len = remove_peer_from_torrent( hash, &peer, SUCCESS_HTTP_HEADER_LENGTH + static_outbuf, FLAG_TCP );
else {
torrent = add_peer_to_torrent( hash, &peer WANT_SYNC_PARAM( 0 ) );
if( !torrent || !( len = return_peers_for_torrent( torrent, numwant, SUCCESS_HTTP_HEADER_LENGTH + static_outbuf, FLAG_TCP ) ) ) HTTPERROR_500;
}
stats_issue_event( EVENT_ANNOUNCE, FLAG_TCP, len);
return len;
}
ssize_t http_handle_request( const int64 client_socket, char *data, size_t recv_length ) {
char *c, *recv_header=data;
ssize_t reply_size = 0, reply_off, len;
#ifdef _DEBUG_HTTPERROR
if( recv_length >= sizeof( debug_request ) )
recv_length = sizeof( debug_request) - 1;
memcpy( debug_request, recv_header, recv_length );
debug_request[ recv_length ] = 0;
#endif
/* This one implicitely tests strlen < 5, too -- remember, it is \n terminated */
if( byte_diff( data, 5, "GET /") ) HTTPERROR_400;
/* Query string MUST terminate with SP -- we know that theres at least a '\n' where this search terminates */
for( c = data + 5; *c!=' ' && *c != '\t' && *c != '\n' && *c != '\r'; ++c ) ;
if( *c != ' ' ) HTTPERROR_400;
/* Skip leading '/' */
for( c = data+4; *c == '/'; ++c);
/* Try to parse the request.
In reality we abandoned requiring the url to be correct. This now
only decodes url encoded characters, we check for announces and
scrapes by looking for "a*" or "sc" */
len = scan_urlencoded_query( &c, data = c, SCAN_PATH );
/* If parsing returned an error, leave with not found */
if( g_redirecturl && ( len == -2 ) ) HTTPERROR_302;
if( len <= 0 ) HTTPERROR_404;
/* This is the hardcore match for announce*/
if( ( *data == 'a' ) || ( *data == '?' ) )
reply_size = http_handle_announce( client_socket, c );
#ifdef WANT_FULLSCRAPE
else if( !byte_diff( data, 12, "scrape HTTP/" ) )
reply_size = http_handle_fullscrape( client_socket, recv_header, recv_length );
#endif
/* This is the hardcore match for scrape */
else if( !byte_diff( data, 2, "sc" ) )
reply_size = http_handle_scrape( client_socket, c );
/* All the rest is matched the standard way */
else switch( len ) {
case 5: /* stats ? */
if( byte_diff( data, 5, "stats") ) HTTPERROR_404;
reply_size = http_handle_stats( client_socket, c, recv_header, recv_length );
break;
default:
HTTPERROR_404;
}
/* If routines handled sending themselves, just return */
if( reply_size == -2 ) return 0;
/* If routine failed, let http error take over */
if( reply_size == -1 ) HTTPERROR_500;
/* This one is rather ugly, so I take you step by step through it.
1. In order to avoid having two buffers, one for header and one for content, we allow all above functions from trackerlogic to
write to a fixed location, leaving SUCCESS_HTTP_HEADER_LENGTH bytes in our static buffer, which is enough for the static string
plus dynamic space needed to expand our Content-Length value. We reserve SUCCESS_HTTP_SIZE_OFF for its expansion and calculate
the space NOT needed to expand in reply_off
*/
reply_off = SUCCESS_HTTP_SIZE_OFF - snprintf( static_outbuf, 0, "%zd", reply_size );
/* 2. Now we sprintf our header so that sprintf writes its terminating '\0' exactly one byte before content starts. Complete
packet size is increased by size of header plus one byte '\n', we will copy over '\0' in next step */
reply_size += 1 + sprintf( static_outbuf + reply_off, "HTTP/1.0 200 OK\r\nContent-Type: text/plain\r\nContent-Length: %zd\r\n\r", reply_size );
/* 3. Finally we join both blocks neatly */
static_outbuf[ SUCCESS_HTTP_HEADER_LENGTH - 1 ] = '\n';
http_senddata( client_socket, static_outbuf + reply_off, reply_size );
return reply_size;
}
const char *g_version_http_c = "$Source$: $Revision$\n";
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