httpd.c

video linux conference

/*****************************************************************************
 * httpd.c
 *****************************************************************************
 * Copyright (C) 2004-2005 VideoLAN
 * $Id: httpd.c 11100 2005-05-22 07:46:02Z courmisch $
 *
 * Authors: Laurent Aimar <[e-mail]>
 *          Remi Denis-Courmont <rem # videolan.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

#include <stdlib.h>
#include <vlc/vlc.h>

#ifdef ENABLE_HTTPD

#include "vlc_httpd.h"
#include "network.h"
#include "vlc_tls.h"

#include <string.h>
#include <errno.h>

#ifdef HAVE_UNISTD_H
#   include <unistd.h>
#endif

#ifdef HAVE_FCNTL_H
#   include <fcntl.h>
#endif

#if defined( UNDER_CE )
#   include <winsock.h>
#elif defined( WIN32 )
#   include <winsock2.h>
#   include <ws2tcpip.h>
#else
#   include <netdb.h>                                         /* hostent ... */
#   include <sys/socket.h>
#   include <netinet/in.h>
#   ifdef HAVE_ARPA_INET_H
#       include <arpa/inet.h>                    /* inet_ntoa(), inet_aton() */
#   endif
#endif

#if defined(WIN32) && !defined(UNDER_CE)
static const struct in6_addr in6addr_any = {{IN6ADDR_ANY_INIT}};
#elif defined(UNDER_CE) && defined(AF_INET6)
#   undef AF_INET6
#endif

#ifndef PF_INET
#    define PF_INET AF_INET                                          /* BeOS */
#endif

#if 0
typedef struct httpd_t          httpd_t;

typedef struct httpd_host_t     httpd_host_t;
typedef struct httpd_url_t      httpd_url_t;
typedef struct httpd_client_t   httpd_client_t;

enum
{
    HTTPD_MSG_NONE,

    /* answer */
    HTTPD_MSG_ANSWER,

    /* channel communication */
    HTTPD_MSG_CHANNEL,

    /* http request */
    HTTPD_MSG_GET,
    HTTPD_MSG_HEAD,
    HTTPD_MSG_POST,

    /* rtsp request */
    HTTPD_MSG_OPTIONS,
    HTTPD_MSG_DESCRIBE,
    HTTPD_MSG_SETUP,
    HTTPD_MSG_PLAY,
    HTTPD_MSG_PAUSE,
    HTTPD_MSG_TEARDOWN,

    /* just to track the count of MSG */
    HTTPD_MSG_MAX
};

enum
{
    HTTPD_PROTO_NONE,
    HTTPD_PROTO_HTTP,
    HTTPD_PROTO_RTSP,
};

typedef struct
{
    httpd_client_t *cl; /* NULL if not throught a connection e vlc internal */

    int     i_type;
    int     i_proto;
    int     i_version;

    /* for an answer */
    int     i_status;
    char    *psz_status;

    /* for a query */
    char    *psz_url;
    char    *psz_args;  /* FIXME find a clean way to handle GET(psz_args) and POST(body) through the same code */

    /* for rtp over rtsp */
    int     i_channel;

    /* options */
    int     i_name;
    char    **name;
    int     i_value;
    char    **value;

    /* body */
    int64_t i_body_offset;
    int     i_body;
    uint8_t *p_body;

} httpd_message_t;

typedef struct httpd_callback_sys_t httpd_callback_sys_t;
/* answer could be null, int this case no answer is requested */
typedef int (*httpd_callback_t)( httpd_callback_sys_t *, httpd_client_t *, httpd_message_t *answer, httpd_message_t *query );


/* create a new host */
httpd_host_t *httpd_HostNew( vlc_object_t *, char *psz_host, int i_port );
/* delete a host */
void          httpd_HostDelete( httpd_host_t * );

/* register a new url */
httpd_url_t *httpd_UrlNew( httpd_host_t *, char *psz_url );
/* register callback on a url */
int          httpd_UrlCatch( httpd_url_t *, int i_msg,
                             httpd_callback_t, httpd_callback_sys_t * );
/* delete an url */
void         httpd_UrlDelete( httpd_url_t * );


void httpd_ClientModeStream( httpd_client_t *cl );
void httpd_ClientModeBidir( httpd_client_t *cl );
static void httpd_ClientClean( httpd_client_t *cl );

/* High level */
typedef struct httpd_file_t     httpd_file_t;
typedef struct httpd_file_sys_t httpd_file_sys_t;
typedef int (*httpd_file_callback_t)( httpd_file_sys_t*, httpd_file_t *, uint8_t *psz_request, uint8_t **pp_data, int *pi_data );
httpd_file_t *httpd_FileNew( httpd_host_t *,
                             char *psz_url, char *psz_mime,
                             char *psz_user, char *psz_password,
                             httpd_file_callback_t pf_fill,
                             httpd_file_sys_t *p_sys );
void         httpd_FileDelete( httpd_file_t * );

typedef struct httpd_redirect_t httpd_redirect_t;
httpd_redirect_t *httpd_RedirectNew( httpd_host_t *, char *psz_url_dst, char *psz_url_src );
void              httpd_RedirectDelete( httpd_redirect_t * );

#if 0
typedef struct httpd_stream_t httpd_stream_t;
httpd_stream_t *httpd_StreamNew( httpd_host_t * );
int             httpd_StreamHeader( httpd_stream_t *, uint8_t *p_data, int i_data );
int             httpd_StreamSend( httpd_stream_t *, uint8_t *p_data, int i_data );
void            httpd_StreamDelete( httpd_stream_t * );
#endif

/* Msg functions facilities */
void         httpd_MsgInit( httpd_message_t * );
void         httpd_MsgAdd( httpd_message_t *, char *psz_name, char *psz_value, ... );
/* return "" if not found. The string is not allocated */
char        *httpd_MsgGet( httpd_message_t *, char *psz_name );
void         httpd_MsgClean( httpd_message_t * );
#endif

#if 0
struct httpd_t
{
    VLC_COMMON_MEMBERS

    /* vlc_mutex_t  lock; */
    int          i_host;
    httpd_host_t **host;
};
#endif

static void httpd_ClientClean( httpd_client_t *cl );

/* each host run in his own thread */
struct httpd_host_t
{
    VLC_COMMON_MEMBERS

    httpd_t     *httpd;

    /* ref count */
    int         i_ref;

    /* address/port and socket for listening at connections */
    struct sockaddr_storage sock;
    int                     i_sock_size;
    int                     fd;

    vlc_mutex_t lock;

    /* all registered url (becarefull that 2 httpd_url_t could point at the same url)
     * This will slow down the url research but make my live easier
     * All url will have their cb trigger, but only the first one can answer
     * */
    int         i_url;
    httpd_url_t **url;

    int            i_client;
    httpd_client_t **client;
    
    /* TLS data */
    tls_server_t *p_tls;
};

struct httpd_url_t
{
    httpd_host_t *host;

    vlc_mutex_t lock;

    char    *psz_url;
    char    *psz_user;
    char    *psz_password;

    struct
    {
        httpd_callback_t     cb;
        httpd_callback_sys_t *p_sys;
    } catch[HTTPD_MSG_MAX];
};

/* status */
enum
{
    HTTPD_CLIENT_RECEIVING,
    HTTPD_CLIENT_RECEIVE_DONE,

    HTTPD_CLIENT_SENDING,
    HTTPD_CLIENT_SEND_DONE,

    HTTPD_CLIENT_WAITING,

    HTTPD_CLIENT_DEAD,

    HTTPD_CLIENT_TLS_HS_IN,
    HTTPD_CLIENT_TLS_HS_OUT
};
/* mode */
enum
{
    HTTPD_CLIENT_FILE,      /* default */
    HTTPD_CLIENT_STREAM,    /* regulary get data from cb */
    HTTPD_CLIENT_BIDIR,     /* check for reading and get data from cb */
};

struct httpd_client_t
{
    httpd_url_t *url;

    int     i_ref;

    struct  sockaddr_storage sock;
    int     i_sock_size;
    int     fd;

    int     i_mode;
    int     i_state;
    int     b_read_waiting; /* stop as soon as possible sending */

    mtime_t i_activity_date;
    mtime_t i_activity_timeout;

    /* buffer for reading header */
    int     i_buffer_size;
    int     i_buffer;
    uint8_t *p_buffer;

    /* */
    httpd_message_t query;  /* client -> httpd */
    httpd_message_t answer; /* httpd -> client */
    
    /* TLS data */
    tls_session_t *p_tls;
};


/*****************************************************************************
 * Various functions
 *****************************************************************************/
/*char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";*/
static void b64_decode( char *dest, char *src )
{
    int  i_level;
    int  last = 0;
    int  b64[256] = {
        -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,  /* 00-0F */
        -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,  /* 10-1F */
        -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,  /* 20-2F */
        52,53,54,55,56,57,58,59,60,61,-1,-1,-1,-1,-1,-1,  /* 30-3F */
        -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,  /* 40-4F */
        15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,  /* 50-5F */
        -1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,  /* 60-6F */
        41,42,43,44,45,46,47,48,49,50,51,-1,-1,-1,-1,-1,  /* 70-7F */
        -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,  /* 80-8F */
        -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,  /* 90-9F */
        -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,  /* A0-AF */
        -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,  /* B0-BF */
        -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,  /* C0-CF */
        -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,  /* D0-DF */
        -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,  /* E0-EF */
        -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1   /* F0-FF */
        };

    for( i_level = 0; *src != '\0'; src++ )
    {
        int  c;

        c = b64[(unsigned int)*src];
        if( c == -1 )
        {
            continue;
        }

        switch( i_level )
        {
            case 0:
                i_level++;
                break;
            case 1:
                *dest++ = ( last << 2 ) | ( ( c >> 4)&0x03 );
                i_level++;
                break;
            case 2:
                *dest++ = ( ( last << 4 )&0xf0 ) | ( ( c >> 2 )&0x0f );
                i_level++;
                break;
            case 3:
                *dest++ = ( ( last &0x03 ) << 6 ) | c;
                i_level = 0;
        }
        last = c;
    }

    *dest = '\0';
}

static struct
{
    char *psz_ext;
    char *psz_mime;
} http_mime[] =
{
    { ".htm",   "text/html" },
    { ".html",  "text/html" },
    { ".txt",   "text/plain" },
    { ".xml",   "text/xml" },
    { ".dtd",   "text/dtd" },

    { ".css",   "text/css" },

    /* image mime */
    { ".gif",   "image/gif" },
    { ".jpe",   "image/jpeg" },
    { ".jpg",   "image/jpeg" },
    { ".jpeg",  "image/jpeg" },
    { ".png",   "image/png" },
    { ".mpjpeg","multipart/x-mixed-replace; boundary=This Random String" },

    /* media mime */
    { ".avi",   "video/avi" },
    { ".asf",   "video/x-ms-asf" },
    { ".m1a",   "audio/mpeg" },
    { ".m2a",   "audio/mpeg" },
    { ".m1v",   "video/mpeg" },
    { ".m2v",   "video/mpeg" },
    { ".mp2",   "audio/mpeg" },
    { ".mp3",   "audio/mpeg" },
    { ".mpa",   "audio/mpeg" },
    { ".mpg",   "video/mpeg" },
    { ".mpeg",  "video/mpeg" },
    { ".mpe",   "video/mpeg" },
    { ".mov",   "video/quicktime" },
    { ".moov",  "video/quicktime" },
    { ".ogg",   "application/ogg" },
    { ".ogm",   "application/ogg" },
    { ".wav",   "audio/wav" },
    { ".wma",   "audio/x-ms-wma" },
    { ".wmv",   "video/x-ms-wmv" },


    /* end */
    { NULL,     NULL }
};
static char *httpd_MimeFromUrl( char *psz_url )
{

    char *psz_ext;

    psz_ext = strrchr( psz_url, '.' );
    if( psz_ext )
    {
        int i;

        for( i = 0; http_mime[i].psz_ext != NULL ; i++ )
        {
            if( !strcasecmp( http_mime[i].psz_ext, psz_ext ) )
            {
                return http_mime[i].psz_mime;
            }
        }
    }
    return "application/octet-stream";
}