util.c 31.6 KB
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/*****************************************************************************
 * util.c: Utils for the multicat suite
 *****************************************************************************
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 * Copyright (C) 2004, 2009, 2011 VideoLAN
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 * $Id$
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 *
 * Authors: Christophe Massiot <massiot@via.ecp.fr>
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
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#include <inttypes.h>
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#include <string.h>
#include <errno.h>
#include <stdarg.h>
#include <sys/time.h>
#include <time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
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#include <sys/ioctl.h>
#include <net/if.h>
#include <unistd.h>
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#include <sys/mman.h>
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#include <netdb.h>
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#include "util.h"

/*****************************************************************************
 * Local declarations
 *****************************************************************************/
#define MAX_MSG 1024
#define PSZ_AUX_EXT "aux"
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#define PSZ_TS_EXT "ts"
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int i_verbose = VERB_DBG;

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/*****************************************************************************
 * sockaddr_t: wrapper to avoid strict-aliasing issues
 *****************************************************************************/
typedef union
{
    struct sockaddr_storage ss;
    struct sockaddr so;
    struct sockaddr_in sin;
    struct sockaddr_in6 sin6;
} sockaddr_t;

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/*****************************************************************************
 * msg_Info
 *****************************************************************************/
void msg_Info( void *_unused, const char *psz_format, ... )
{
    if ( i_verbose >= VERB_INFO )
    {
        va_list args;
        char psz_fmt[MAX_MSG];
        va_start( args, psz_format );

        snprintf( psz_fmt, MAX_MSG, "info: %s\n", psz_format );
        vfprintf( stderr, psz_fmt, args );
    }
}

/*****************************************************************************
 * msg_Err
 *****************************************************************************/
void msg_Err( void *_unused, const char *psz_format, ... )
{
    va_list args;
    char psz_fmt[MAX_MSG];
    va_start( args, psz_format );

    snprintf( psz_fmt, MAX_MSG, "error: %s\n", psz_format );
    vfprintf( stderr, psz_fmt, args );
}

/*****************************************************************************
 * msg_Warn
 *****************************************************************************/
void msg_Warn( void *_unused, const char *psz_format, ... )
{
    if ( i_verbose >= VERB_WARN )
    {
        va_list args;
        char psz_fmt[MAX_MSG];
        va_start( args, psz_format );

        snprintf( psz_fmt, MAX_MSG, "warning: %s\n", psz_format );
        vfprintf( stderr, psz_fmt, args );
    }
}

/*****************************************************************************
 * msg_Dbg
 *****************************************************************************/
void msg_Dbg( void *_unused, const char *psz_format, ... )
{
    if ( i_verbose >= VERB_DBG )
    {
        va_list args;
        char psz_fmt[MAX_MSG];
        va_start( args, psz_format );

        snprintf( psz_fmt, MAX_MSG, "debug: %s\n", psz_format );
        vfprintf( stderr, psz_fmt, args );
    }
}

/*****************************************************************************
 * msg_Raw
 *****************************************************************************/
void msg_Raw( void *_unused, const char *psz_format, ... )
{
    va_list args;
    char psz_fmt[MAX_MSG];
    va_start( args, psz_format );

    snprintf( psz_fmt, MAX_MSG, "%s\n", psz_format );
    vfprintf( stderr, psz_fmt, args );
}

/*****************************************************************************
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 * wall_Date/real_Date: returns a 27 MHz timestamp
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 *****************************************************************************/
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static uint64_t _wall_Date( bool b_realtime )
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{
#if defined (HAVE_CLOCK_NANOSLEEP)
    struct timespec ts;

    /* Try to use POSIX monotonic clock if available */
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    if( b_realtime || clock_gettime( CLOCK_MONOTONIC, &ts ) == EINVAL )
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        /* Run-time fallback to real-time clock (always available) */
        (void)clock_gettime( CLOCK_REALTIME, &ts );

    return ((uint64_t)ts.tv_sec * (uint64_t)27000000)
            + (uint64_t)(ts.tv_nsec * 27 / 1000);
#else
    struct timeval tv_date;

    /* gettimeofday() could return an error, and should be tested. However, the
     * only possible error, according to 'man', is EFAULT, which can not happen
     * here, since tv is a local variable. */
    gettimeofday( &tv_date, NULL );
    return( (uint64_t) tv_date.tv_sec * 27000000 + (uint64_t) tv_date.tv_usec * 27 );
#endif
}

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uint64_t wall_Date( void )
{
    return _wall_Date( false );
}

uint64_t real_Date( void )
{
    return _wall_Date( true );
}

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/*****************************************************************************
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 * wall_Sleep/real_Sleep
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 *****************************************************************************/
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static void _wall_Sleep( uint64_t i_delay, bool b_realtime )
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{
    struct timespec ts;
    ts.tv_sec = i_delay / 27000000;
    ts.tv_nsec = (i_delay % 27000000) * 1000 / 27;

#if defined( HAVE_CLOCK_NANOSLEEP )
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    int val = EINVAL;
    if ( !b_realtime )
        while ( ( val = clock_nanosleep( CLOCK_MONOTONIC, 0, &ts, &ts ) ) == EINTR );
    if( val == EINVAL )
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    {
        ts.tv_sec = i_delay / 27000000;
        ts.tv_nsec = (i_delay % 27000000) * 1000 / 27;
        while ( clock_nanosleep( CLOCK_REALTIME, 0, &ts, &ts ) == EINTR );
    }
#else
    while ( nanosleep( &ts, &ts ) && errno == EINTR );
#endif
}

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void wall_Sleep( uint64_t i_delay )
{
    _wall_Sleep( i_delay, false );
}

void real_Sleep( uint64_t i_delay )
{
    _wall_Sleep( i_delay, true );
}

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/*****************************************************************************
 * GetInterfaceIndex: returns the index of an interface
 *****************************************************************************/
static int GetInterfaceIndex( const char *psz_name )
{
    int i_fd;
    struct ifreq ifr;

    if ( (i_fd = socket( AF_INET, SOCK_DGRAM, 0 )) < 0 )
    {
        msg_Err( NULL, "unable to open socket (%s)", strerror(errno) );
        exit(EXIT_FAILURE);
    }

    strncpy( ifr.ifr_name, psz_name, IFNAMSIZ );
    ifr.ifr_name[IFNAMSIZ-1] = '\0';

    if ( ioctl( i_fd, SIOCGIFINDEX, &ifr ) < 0 )
    {
        msg_Err( NULL, "unable to get interface index (%s)", strerror(errno) );
        exit(EXIT_FAILURE);
    }

    close( i_fd );

    return ifr.ifr_ifindex;
}

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/*****************************************************************************
 * PrintSocket: print socket characteristics for debug purposes
 *****************************************************************************/
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static void PrintSocket( const char *psz_text, sockaddr_t *p_bind,
                         sockaddr_t *p_connect )
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{
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    if ( p_bind->ss.ss_family == AF_INET )
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    {
        msg_Dbg( NULL, "%s bind:%s:%u", psz_text,
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                 inet_ntoa(p_bind->sin.sin_addr), ntohs(p_bind->sin.sin_port) );
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    }
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    else if ( p_bind->ss.ss_family == AF_INET6 )
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    {
        char buf[INET6_ADDRSTRLEN];
        msg_Dbg( NULL, "%s bind:[%s]:%u", psz_text,
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                 inet_ntop(AF_INET6, &p_bind->sin6.sin6_addr, buf, sizeof(buf)),
                 ntohs(p_bind->sin6.sin6_port) );
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    }
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    if ( p_connect->ss.ss_family == AF_INET )
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    {
        msg_Dbg( NULL, "%s connect:%s:%u", psz_text,
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                 inet_ntoa(p_connect->sin.sin_addr),
                 ntohs(p_connect->sin.sin_port) );
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    }
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    else if ( p_connect->ss.ss_family == AF_INET6 )
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    {
        char buf[INET6_ADDRSTRLEN];
        msg_Dbg( NULL, "%s connect:[%s]:%u", psz_text,
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                 inet_ntop(AF_INET6, &p_connect->sin6.sin6_addr, buf,
                           sizeof(buf)),
                 ntohs(p_connect->sin6.sin6_port) );
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    }
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}

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/*****************************************************************************
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 * ParseNodeService: parse a host:port string
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 *****************************************************************************/
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static struct addrinfo *ParseNodeService( char *_psz_string, char **ppsz_end,
                                          uint16_t i_default_port,
                                          int *pi_if_index )
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{
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    int i_family = AF_INET;
    char psz_port_buffer[6];
    char *psz_string = strdup( _psz_string );
    char *psz_node, *psz_port = NULL, *psz_end;
    struct addrinfo *p_res;
    struct addrinfo hint;
    int i_ret;

    if ( psz_string[0] == '[' )
    {
        i_family = AF_INET6;
        psz_node = psz_string + 1;
        psz_end = strchr( psz_node, ']' );
        if ( psz_end == NULL )
        {
            msg_Warn( NULL, "invalid IPv6 address %s", _psz_string );
            free( psz_string );
            return NULL;
        }
        *psz_end++ = '\0';

        char *psz_intf = strrchr( psz_node, '%' );
        if ( psz_intf != NULL )
        {
            *psz_intf++ = '\0';
            if ( pi_if_index != NULL )
                *pi_if_index = GetInterfaceIndex( psz_intf );
        }
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    }
    else
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    {
        psz_node = psz_string;
        psz_end = strpbrk( psz_string, "@:,/" );
    }
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    if ( psz_end != NULL && psz_end[0] == ':' )
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    {
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        *psz_end++ = '\0';
        psz_port = psz_end;
        psz_end = strpbrk( psz_port, "@:,/" );
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    }

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    if ( psz_end != NULL )
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    {
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        *psz_end = '\0';
        if ( ppsz_end != NULL )
            *ppsz_end = _psz_string + (psz_end - psz_string);
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    }
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    else if ( ppsz_end != NULL )
        *ppsz_end = _psz_string + strlen(_psz_string);
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    if ( i_default_port != 0 && (psz_port == NULL || !*psz_port) )
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    {
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        sprintf( psz_port_buffer, "%u", i_default_port );
        psz_port = psz_port_buffer;
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    }

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    if ( psz_node[0] == '\0' )
        psz_node = "0.0.0.0";
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    memset( &hint, 0, sizeof(hint) );
    hint.ai_family = i_family;
    hint.ai_socktype = SOCK_DGRAM;
    hint.ai_protocol = 0;
    hint.ai_flags = AI_PASSIVE | AI_NUMERICHOST | AI_NUMERICSERV | AI_ADDRCONFIG;
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    if ( (i_ret = getaddrinfo( psz_node, psz_port, &hint, &p_res )) != 0 )
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    {
        //msg_Warn( NULL, "getaddrinfo error: %s", gai_strerror(i_ret) );
        free( psz_string );
        return NULL;
    }
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    free( psz_string );
    return p_res;
}
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/*****************************************************************************
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 * OpenSocket: parse argv and open IPv4 & IPv6 sockets
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 *****************************************************************************/
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int OpenSocket( const char *_psz_arg, int i_ttl, uint16_t i_bind_port,
                uint16_t i_connect_port, unsigned int *pi_weight, bool *pb_tcp )
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{
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    sockaddr_t bind_addr, connect_addr;
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    int i_fd, i;
    char *psz_arg = strdup(_psz_arg);
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    char *psz_token = psz_arg;
    char *psz_token2 = NULL;
    int i_bind_if_index = 0, i_connect_if_index = 0;
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    in_addr_t i_if_addr = INADDR_ANY;
    int i_tos = 0;
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    bool b_tcp;
    struct addrinfo *p_ai;
    int i_family;
    socklen_t i_sockaddr_len;

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    bind_addr.ss.ss_family = AF_UNSPEC;
    connect_addr.ss.ss_family = AF_UNSPEC;
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    if ( pb_tcp == NULL )
        pb_tcp = &b_tcp;
    *pb_tcp = false;
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    psz_token2 = strrchr( psz_arg, ',' );
    if ( psz_token2 )
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    {
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        *psz_token2++ = '\0';
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        if ( pi_weight )
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            *pi_weight = strtoul( psz_token2, NULL, 0 );
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    }
    else if ( pi_weight )
        *pi_weight = 1;

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    psz_token2 = strchr( psz_arg, '/' );
    if ( psz_token2 )
        *psz_token2 = '\0';
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    if ( *psz_token == '\0' )
        return -1;

    /* Hosts */
    if ( psz_token[0] != '@' )
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    {
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        p_ai = ParseNodeService( psz_token, &psz_token, i_connect_port,
                                 &i_connect_if_index );
        if ( p_ai == NULL )
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            return -1;
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        memcpy( &connect_addr.ss, p_ai->ai_addr, p_ai->ai_addrlen );
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        freeaddrinfo( p_ai );
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    }

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    if ( psz_token[0] == '@' )
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    {
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        psz_token++;
        p_ai = ParseNodeService( psz_token, &psz_token, i_bind_port,
                                 &i_bind_if_index );
        if ( p_ai == NULL )
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            return -1;
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        memcpy( &bind_addr.ss, p_ai->ai_addr, p_ai->ai_addrlen );
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        freeaddrinfo( p_ai );
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    }
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    if ( bind_addr.ss.ss_family == AF_UNSPEC &&
         connect_addr.ss.ss_family == AF_UNSPEC )
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        return -1;
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    /* Weights and options */
    if ( psz_token2 )
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    {
        do
        {
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            *psz_token2++ = '\0';
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#define IS_OPTION( option ) (!strncasecmp( psz_token2, option, strlen(option) ))
#define ARG_OPTION( option ) (psz_token2 + strlen(option))
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            if ( IS_OPTION("ifindex=") )
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                i_bind_if_index = i_connect_if_index =
                    strtol( ARG_OPTION("ifindex="), NULL, 0 );
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            else if ( IS_OPTION("ifaddr=") )
                i_if_addr = inet_addr( ARG_OPTION("ifaddr=") );
            else if ( IS_OPTION("ttl=") )
                i_ttl = strtol( ARG_OPTION("ttl="), NULL, 0 );
            else if ( IS_OPTION("tos=") )
                i_tos = strtol( ARG_OPTION("tos="), NULL, 0 );
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            else if ( IS_OPTION("tcp") )
                *pb_tcp = true;
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            else
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                msg_Warn( NULL, "unrecognized option %s", psz_token2 );
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#undef IS_OPTION
#undef ARG_OPTION
        }
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        while ( (psz_token2 = strchr( psz_token2, '/' )) != NULL );
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    }

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    free( psz_arg );

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    /* Sanity checks */
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    if ( bind_addr.ss.ss_family != AF_UNSPEC
          && connect_addr.ss.ss_family != AF_UNSPEC
          && bind_addr.ss.ss_family != connect_addr.ss.ss_family )
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    {
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        msg_Err( NULL, "incompatible address types" );
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        exit(EXIT_FAILURE);
    }
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    if ( bind_addr.ss.ss_family != AF_UNSPEC )
        i_family = bind_addr.ss.ss_family;
    else if ( connect_addr.ss.ss_family != AF_UNSPEC )
        i_family = connect_addr.ss.ss_family;
    else
    {
        msg_Err( NULL, "ambiguous address declaration" );
        exit(EXIT_FAILURE);
    }
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    i_sockaddr_len = (i_family == AF_INET) ? sizeof(struct sockaddr_in) :
                     sizeof(struct sockaddr_in6);
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    if ( i_bind_if_index && i_connect_if_index
          && i_bind_if_index != i_connect_if_index )
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    {
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        msg_Err( NULL, "incompatible bind and connect interfaces" );
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        exit(EXIT_FAILURE);
    }
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    if ( i_connect_if_index ) i_bind_if_index = i_connect_if_index;
    else i_connect_if_index = i_bind_if_index;
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    /* Socket configuration */
    if ( (i_fd = socket( i_family, *pb_tcp ? SOCK_STREAM : SOCK_DGRAM,
                         0 )) < 0 )
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    {
        msg_Err( NULL, "unable to open socket (%s)", strerror(errno) );
        exit(EXIT_FAILURE);
    }

    i = 1;
    if ( setsockopt( i_fd, SOL_SOCKET, SO_REUSEADDR, (void *)&i,
                     sizeof(i) ) == -1 )
    {
        msg_Err( NULL, "unable to set socket (%s)", strerror(errno) );
        exit(EXIT_FAILURE);
    }

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    if ( i_family == AF_INET6 )
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    {
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        if ( i_bind_if_index
              && setsockopt( i_fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
                     (void *)&i_bind_if_index, sizeof(i_bind_if_index) ) < 0 )
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        {
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            msg_Err( NULL, "couldn't set interface index" );
            PrintSocket( "socket definition:", &bind_addr, &connect_addr );
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            exit(EXIT_FAILURE);
        }

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        if ( bind_addr.ss.ss_family != AF_UNSPEC )
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        {
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            if ( IN6_IS_ADDR_MULTICAST( &bind_addr.sin6.sin6_addr ) )
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            {
                struct ipv6_mreq imr;
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                sockaddr_t bind_addr_any = bind_addr;
                bind_addr_any.sin6.sin6_addr = in6addr_any;
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                if ( bind( i_fd, &bind_addr_any.so,
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                           sizeof(bind_addr_any) ) < 0 )
                {
                    msg_Err( NULL, "couldn't bind" );
                    PrintSocket( "socket definition:", &bind_addr,
                                 &connect_addr );
                    exit(EXIT_FAILURE);
                }

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                imr.ipv6mr_multiaddr = bind_addr.sin6.sin6_addr;
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                imr.ipv6mr_interface = i_bind_if_index;

                /* Join Multicast group without source filter */
                if ( setsockopt( i_fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
                                 (char *)&imr, sizeof(struct ipv6_mreq) ) < 0 )
                {
                    msg_Err( NULL, "couldn't join multicast group" );
                    PrintSocket( "socket definition:", &bind_addr,
                                  &connect_addr );
                    exit(EXIT_FAILURE);
                }
            }
            else
                goto normal_bind;
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        }
    }
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    else if ( bind_addr.ss.ss_family != AF_UNSPEC )
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    {
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normal_bind:
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        if ( bind( i_fd, &bind_addr.so, i_sockaddr_len ) < 0 )
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        {
            msg_Err( NULL, "couldn't bind" );
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            PrintSocket( "socket definition:", &bind_addr, &connect_addr );
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            exit(EXIT_FAILURE);
        }
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    }
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    if ( !*pb_tcp )
    {
        /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s) to
         * avoid packet loss caused by scheduling problems */
        i = 0x80000;
        setsockopt( i_fd, SOL_SOCKET, SO_RCVBUF, (void *) &i, sizeof( i ) );
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        /* Join the multicast group if the socket is a multicast address */
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        if ( bind_addr.ss.ss_family == AF_INET
              && IN_MULTICAST( ntohl(bind_addr.sin.sin_addr.s_addr)) )
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        {
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            if ( connect_addr.ss.ss_family != AF_UNSPEC )
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            {
                /* Source-specific multicast */
                struct ip_mreq_source imr;
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                imr.imr_multiaddr = bind_addr.sin.sin_addr;
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                imr.imr_interface.s_addr = i_if_addr;
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                imr.imr_sourceaddr = connect_addr.sin.sin_addr;
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                if ( i_bind_if_index )
                    msg_Warn( NULL, "ignoring ifindex option in SSM" );

                if ( setsockopt( i_fd, IPPROTO_IP, IP_ADD_SOURCE_MEMBERSHIP,
                            (char *)&imr, sizeof(struct ip_mreq_source) ) < 0 )
                    msg_Err( NULL, "couldn't join multicast group (%s)",
                             strerror(errno) );
                    PrintSocket( "socket definition:", &bind_addr,
                                 &connect_addr );
                    exit(EXIT_FAILURE);
            }
            else if ( i_bind_if_index )
            {
                /* Linux-specific interface-bound multicast */
                struct ip_mreqn imr;
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                imr.imr_multiaddr = bind_addr.sin.sin_addr;
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                imr.imr_address.s_addr = i_if_addr;
                imr.imr_ifindex = i_bind_if_index;

                if ( setsockopt( i_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
                                 (char *)&imr, sizeof(struct ip_mreqn) ) < 0 )
                    msg_Err( NULL, "couldn't join multicast group (%s)",
                             strerror(errno) );
                    PrintSocket( "socket definition:", &bind_addr,
                                 &connect_addr );
                    exit(EXIT_FAILURE);
            }
            else
            {
                /* Regular multicast */
                struct ip_mreq imr;
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                imr.imr_multiaddr = bind_addr.sin.sin_addr;
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                imr.imr_interface.s_addr = i_if_addr;

                if ( setsockopt( i_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
                                 (char *)&imr, sizeof(struct ip_mreq) ) < 0 )
                {
                    msg_Err( NULL, "couldn't join multicast group (%s)",
                             strerror(errno) );
                    PrintSocket( "socket definition:", &bind_addr,
                                 &connect_addr );
                    exit(EXIT_FAILURE);
                }
            }
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        }
    }
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    if ( connect_addr.ss.ss_family != AF_UNSPEC )
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    {
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        if ( connect( i_fd, &connect_addr.so, i_sockaddr_len ) < 0 )
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        {
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            msg_Err( NULL, "cannot connect socket (%s)",
                     strerror(errno) );
            PrintSocket( "socket definition:", &bind_addr, &connect_addr );
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            exit(EXIT_FAILURE);
        }

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        if ( !*pb_tcp )
        {
            if ( i_ttl )
            {
                if ( i_family == AF_INET
640
                      && IN_MULTICAST(ntohl(connect_addr.sin.sin_addr.s_addr)) )
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                {
                    if ( setsockopt( i_fd, IPPROTO_IP, IP_MULTICAST_TTL,
                                     (void *)&i_ttl, sizeof(i_ttl) ) == -1 )
                    {
                        msg_Err( NULL, "couldn't set TTL (%s)",
                                 strerror(errno) );
                        PrintSocket( "socket definition:", &bind_addr,
                                     &connect_addr );
                        exit(EXIT_FAILURE);
                    }
                }

                if ( i_family == AF_INET6
654
                      && IN6_IS_ADDR_MULTICAST(&connect_addr.sin6.sin6_addr) )
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                {
                    if ( setsockopt( i_fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
                                     (void *)&i_ttl, sizeof(i_ttl) ) == -1 )
                    {
                        msg_Err( NULL, "couldn't set TTL (%s)",
                                 strerror(errno) );
                        PrintSocket( "socket definition:", &bind_addr,
                                     &connect_addr );
                        exit(EXIT_FAILURE);
                    }
                }
            }

            if ( i_tos )
            {
                if ( setsockopt( i_fd, IPPROTO_IP, IP_TOS,
                                 (void *)&i_tos, sizeof(i_tos) ) == -1 )
                {
                    msg_Err( NULL, "couldn't set TOS (%s)", strerror(errno) );
                    PrintSocket( "socket definition:", &bind_addr,
                                 &connect_addr );
                    exit(EXIT_FAILURE);
                }
            }
        }
    }
    else if ( *pb_tcp )
682
    {
683 684 685
        /* Open in listen mode - wait for an incoming connection */
        int i_new_fd;
        if ( listen( i_fd, 1 ) < 0 )
686
        {
687 688
            msg_Err( NULL, "couldn't listen (%s)", strerror(errno) );
            PrintSocket( "socket definition:", &bind_addr, &connect_addr );
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            exit(EXIT_FAILURE);
        }

692
        while ( (i_new_fd = accept( i_fd, NULL, NULL )) < 0 )
693
        {
694
            if ( errno != EINTR )
695
            {
696 697
                msg_Err( NULL, "couldn't accept (%s)", strerror(errno) );
                PrintSocket( "socket definition:", &bind_addr, &connect_addr );
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                exit(EXIT_FAILURE);
            }
        }
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        close( i_fd );
        return i_new_fd;
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    }

    return i_fd;
}

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/*****************************************************************************
 * StatFile: parse argv and return the mode of the named file
 *****************************************************************************/
mode_t StatFile( const char *psz_arg )
{
    struct stat sb;
    if ( stat( psz_arg, &sb ) < 0 )
        return 0;
    return sb.st_mode;
}

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/*****************************************************************************
 * OpenFile: parse argv and open file descriptors
 *****************************************************************************/
722
int OpenFile( const char *psz_arg, bool b_read, bool b_append )
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{
    struct stat sb;
    int i_fd;
    int i_mode = b_read ? O_RDONLY : O_WRONLY;

    if ( stat( psz_arg, &sb ) < 0 )
    {
        if ( b_read )
        {
            msg_Err( NULL, "file %s doesn't exist (%s)", psz_arg,
                     strerror(errno) );
            exit(EXIT_FAILURE);
        }
        i_mode |= O_CREAT;
    }
738
    else if ( !(S_ISCHR(sb.st_mode) || S_ISFIFO(sb.st_mode)) && !b_read )
739
    {
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        if ( b_append )
            i_mode |= O_APPEND;
        else
            i_mode |= O_TRUNC;
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    }

    if ( (i_fd = open( psz_arg, i_mode, 0644 )) < 0 )
    {
        msg_Err( NULL, "couldn't open file %s (%s)", psz_arg, strerror(errno) );
        exit(EXIT_FAILURE);
    }

    return i_fd;
}

/*****************************************************************************
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 * GetAuxFile: generate a file name for the TS file
 * Remember to free the returned string
758
 *****************************************************************************/
759
char *GetAuxFile( const char *psz_arg, size_t i_payload_size )
760
{
761
    char *psz_aux = malloc( strlen(psz_arg) + 256 );
762 763 764
    char *psz_token;

    strcpy( psz_aux, psz_arg );
765 766 767 768 769 770

    psz_token = strrchr( psz_aux, '/' );
    if ( psz_token != NULL )
        psz_token++;
    else
        psz_token = psz_aux + 1;
771
    if ( *psz_token ) psz_token++; /* Skip first character of base name */
772 773

    /* Strip extension */
774
    psz_token = strrchr( psz_token, '.' );
775
    if ( psz_token ) *psz_token = '\0';
776 777

    /* Append extension */
778
    strcat( psz_aux, "." PSZ_AUX_EXT );
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    if ( i_payload_size != DEFAULT_PAYLOAD_SIZE )
        sprintf( psz_aux + strlen(psz_aux), "%zu", i_payload_size );

    return psz_aux;
}
784

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/*****************************************************************************
 * OpenAuxFile
 *****************************************************************************/
FILE *OpenAuxFile( const char *psz_arg, bool b_read, bool b_append )
{
    FILE *p_aux;

    if ( (p_aux = fopen( psz_arg,
793
                         b_read ? "rb" : (b_append ? "ab" : "wb") )) == NULL )
794
    {
795
        msg_Err( NULL, "couldn't open file %s (%s)", psz_arg,
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                 strerror(errno) );
        exit(EXIT_FAILURE);
    }

    return p_aux;
}
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/*****************************************************************************
 * LookupAuxFile: find an STC in an auxiliary file
 *****************************************************************************/
off_t LookupAuxFile( const char *psz_arg, int64_t i_wanted, bool b_absolute )
{
    uint8_t *p_aux;
    off_t i_offset1 = 0, i_offset2;
    int i_stc_fd;
    struct stat stc_stat;

    if ( (i_stc_fd = open( psz_arg, O_RDONLY )) == -1 )
    {
        msg_Err( NULL, "unable to open %s (%s)", psz_arg, strerror(errno) );
        return -1;
    }

    if ( fstat( i_stc_fd, &stc_stat ) == -1
          || stc_stat.st_size < sizeof(uint64_t) )
    {
        msg_Err( NULL, "unable to stat %s (%s)", psz_arg, strerror(errno) );
        return -1;
    }

    p_aux = mmap( NULL, stc_stat.st_size, PROT_READ, MAP_SHARED,
                  i_stc_fd, 0 );
    if ( p_aux == MAP_FAILED )
    {
        msg_Err( NULL, "unable to mmap %s (%s)", psz_arg, strerror(errno) );
        return -1;
    }

    i_offset2 = stc_stat.st_size / sizeof(uint64_t);

    if ( i_wanted < 0 )
        i_wanted += FromSTC( p_aux + (i_offset2 - 1) * sizeof(uint64_t) );
    else if ( !b_absolute )
        i_wanted += FromSTC( p_aux );

    if ( i_wanted < 0 )
    {
        msg_Err( NULL, "invalid offset" );
        return -1;
    }

    for ( ; ; )
    {
        off_t i_mid_offset = (i_offset1 + i_offset2) / 2;
        uint8_t *p_mid_aux = p_aux + i_mid_offset * sizeof(uint64_t);
        uint64_t i_mid_stc = FromSTC( p_mid_aux );

        if ( i_offset1 == i_mid_offset )
            break;

        if ( i_mid_stc >= i_wanted )
            i_offset2 = i_mid_offset;
        else
            i_offset1 = i_mid_offset;
    }

    munmap( p_aux, stc_stat.st_size );
    close( i_stc_fd );

    return i_offset2;
}

869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919
/*****************************************************************************
 * CheckFileSizes: check the consistency of file and aux sizes
 *****************************************************************************/
void CheckFileSizes( const char *psz_file, const char *psz_aux_file,
                     size_t i_payload_size )
{
    struct stat st;
    off_t i_file_packets, i_aux_packets;

    if ( stat( psz_file, &st ) < 0 )
        i_file_packets = 0;
    else
    {
        i_file_packets = st.st_size / i_payload_size;
        if ( st.st_size % i_payload_size )
        {
            msg_Warn( NULL, "file size is not a multiple of %jd, truncating",
                      i_payload_size );
            if ( truncate( psz_file, i_file_packets * i_payload_size ) < 0 )
                msg_Err( NULL, "truncate failed (%s)", strerror(errno) );
        }
    }

    if ( stat( psz_aux_file, &st ) < 0 )
        i_aux_packets = 0;
    else
    {
        i_aux_packets = st.st_size / sizeof(uint64_t);
        if ( st.st_size % sizeof(uint64_t) )
        {
            msg_Warn( NULL, "aux size is not a multiple of %jd, truncating",
                      sizeof(uint64_t) );
            if ( truncate( psz_aux_file, i_aux_packets * sizeof(uint64_t) ) < 0 )
                msg_Err( NULL, "truncate failed (%s)", strerror(errno) );
        }
    }

    if ( i_file_packets < i_aux_packets )
    {
        msg_Warn( NULL, "truncating aux file" );
        if ( truncate( psz_aux_file, i_file_packets * sizeof(uint64_t) ) < 0 )
            msg_Err( NULL, "truncate failed (%s)", strerror(errno) );
    }
    else if ( i_aux_packets < i_file_packets )
    {
        msg_Warn( NULL, "truncating file" );
        if ( truncate( psz_file, i_aux_packets * i_payload_size ) < 0 )
            msg_Err( NULL, "truncate failed (%s)", strerror(errno) );
    }
}

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/*****************************************************************************
 * GetDirFile: return the prefix of the file according to the STC
 *****************************************************************************/
uint64_t GetDirFile( uint64_t i_rotate_size, int64_t i_wanted )
{
    if ( i_wanted <= 0 )
        i_wanted += real_Date();
    if ( i_wanted <= 0 )
        return 0;

    return i_wanted / i_rotate_size;
}

/*****************************************************************************
 * OpenDirFile: return fd + aux file pointer
 *****************************************************************************/
int OpenDirFile( const char *psz_dir_path, uint64_t i_file, bool b_read,
                 size_t i_payload_size, FILE **pp_aux_file )
{
    int i_fd;
    char psz_file[strlen(psz_dir_path) + sizeof(PSZ_TS_EXT) +
                  sizeof(".18446744073709551615")];
942 943
    char *psz_aux_file;

944
    sprintf( psz_file, "%s/%"PRIu64"."PSZ_TS_EXT, psz_dir_path, i_file );
945 946 947 948
    psz_aux_file = GetAuxFile( psz_file, i_payload_size );

    if ( !b_read )
        CheckFileSizes( psz_file, psz_aux_file, i_payload_size );
949 950

    i_fd = OpenFile( psz_file, b_read, !b_read );
951 952 953 954 955
    if ( i_fd < 0 )
    {
        free( psz_aux_file );
        return -1;
    }
956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982

    *pp_aux_file = OpenAuxFile( psz_aux_file, b_read, !b_read );
    free( psz_aux_file );
    if ( *pp_aux_file == NULL )
    {
        close( i_fd );
        return -1;
    }
    return i_fd;
}

/*****************************************************************************
 * LookupDirAuxFile: find an STC in an auxiliary file of a directory
 *****************************************************************************/
off_t LookupDirAuxFile( const char *psz_dir_path, uint64_t i_file,
                        int64_t i_wanted, size_t i_payload_size )
{
    off_t i_ret;
    char psz_file[strlen(psz_dir_path) + sizeof(PSZ_TS_EXT) +
                  sizeof(".18446744073709551615")];
    sprintf( psz_file, "%s/%"PRIu64"."PSZ_TS_EXT, psz_dir_path, i_file );

    char *psz_aux_file = GetAuxFile( psz_file, i_payload_size );
    i_ret = LookupAuxFile( psz_aux_file, i_wanted, true );
    free( psz_aux_file );
    return i_ret;
}