util.c 36.7 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"

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#define DEBUG_SOCKET
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/*****************************************************************************
 * 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 ) == -1 )
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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)
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            + ((uint64_t)ts.tv_nsec * 27 / 1000);
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#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 )
{
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#if !defined(__FreeBSD__) && !defined(__APPLE__)
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    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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#else
    return 0;
#endif
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}

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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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    if ( i_family != AF_INET6 )
    {
        /* Give a try to inet_aton because experience shows that getaddrinfo()
         * fails in certain cases, like when network is down. */
        struct in_addr addr;
        if ( inet_aton( psz_node, &addr ) != 0 )
        {
            struct sockaddr_in *p_sin = malloc( sizeof(struct sockaddr_in) );
            p_sin->sin_family = AF_INET;
            if ( psz_port != NULL )
                p_sin->sin_port = ntohs( atoi( psz_port ) );
            else
                p_sin->sin_port = 0;
            p_sin->sin_addr = addr;

            p_res = malloc( sizeof(struct addrinfo) );
            p_res->ai_family = AF_INET;
            p_res->ai_socktype = SOCK_DGRAM;
            p_res->ai_protocol = 0;
            p_res->ai_addrlen = sizeof(struct sockaddr_in);
            p_res->ai_addr = (struct sockaddr *)p_sin;
            p_res->ai_canonname = NULL;
            p_res->ai_next = NULL;

            free( psz_string );
            return p_res;
        }
    }

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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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/*****************************************************************************
 * RawFillHeaders - fill ip/udp headers for RAW socket
 *****************************************************************************/
static void RawFillHeaders(struct udprawpkt *dgram,
                        in_addr_t ipsrc, in_addr_t ipdst,
                        uint16_t portsrc, uint16_t portdst,
                        uint8_t ttl, uint8_t tos, uint16_t len)
{
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#ifndef __APPLE__
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    struct iphdr *iph = &(dgram->iph);
    struct udphdr *udph = &(dgram->udph);

#ifdef DEBUG_SOCKET
    char ipsrc_str[16], ipdst_str[16];
    struct in_addr insrc, indst;
    insrc.s_addr = ipsrc;
    indst.s_addr = ipdst;
    strncpy(ipsrc_str, inet_ntoa(insrc), 16);
    strncpy(ipdst_str, inet_ntoa(indst), 16);
    printf("Filling raw header (%p) (%s:%u -> %s:%u)\n", dgram, ipsrc_str, portsrc, ipdst_str, portdst);
#endif

    // Fill ip header
    iph->ihl      = 5;              // ip header with no specific option
    iph->version  = 4;
    iph->tos      = tos;
    iph->tot_len  = sizeof(struct udprawpkt) + len; // auto-htoned ?
    iph->id       = htons(0);       // auto-generated if frag_off (flags) = 0 ?
    iph->frag_off = 0;
    iph->ttl      = ttl;
    iph->protocol = IPPROTO_UDP;
    iph->check    = 0;
    iph->saddr    = ipsrc;
    iph->daddr    = ipdst;

    // Fill udp header
    #ifdef __FAVOR_BSD
    udph->uh_sport = htons(portsrc);
    udph->uh_dport = htons(portdst);
    udph->uh_ulen  = htons(sizeof(struct udphdr) + len);
    udph->uh_sum   = 0;
    #else
    udph->source = htons(portsrc);
    udph->dest   = htons(portdst);
    udph->len    = htons(sizeof(struct udphdr) + len);
    udph->check  = 0;
    #endif

    // Compute ip header checksum. Computed by kernel when frag_off = 0 ?
    //iph->check = csum((unsigned short *)iph, sizeof(struct iphdr));
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#endif
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}

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/*****************************************************************************
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 * OpenSocket: parse argv and open IPv4 & IPv6 sockets
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 *****************************************************************************/
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static char *config_stropt( char *psz_string )
{
    char *ret, *tmp;
    if ( !psz_string || strlen( psz_string ) == 0 )
        return NULL;
    ret = tmp = strdup( psz_string );
    while (*tmp) {
        if (*tmp == '_')
            *tmp = ' ';
        if (*tmp == '/') {
            *tmp = '\0';
            break;
        }
        tmp++;
    }
    return ret;
}

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int OpenSocket( const char *_psz_arg, int i_ttl, uint16_t i_bind_port,
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                uint16_t i_connect_port, unsigned int *pi_weight, bool *pb_tcp,
                struct opensocket_opt *p_opt)
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{
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    sockaddr_t bind_addr, connect_addr;
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    int i_fd = -1, i;
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    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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    bool b_host = false;
    bool b_raw_packets = false;
    in_addr_t i_raw_srcaddr = INADDR_ANY; 
    int i_raw_srcport = 0;
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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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        b_host = true;
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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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#ifdef DEBUG_SOCKET
    PrintSocket( "socket definition:", &bind_addr, &connect_addr );
#endif
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    /* opensocket optional struct */
    if (p_opt) {
        if (p_opt->p_raw_pktheader) {
            memset(p_opt->p_raw_pktheader, 0, sizeof(struct udprawpkt));
            b_raw_packets = true;
        }
    }
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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=") )
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            {
                char *option = config_stropt( ARG_OPTION("ifaddr=") );
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                i_if_addr = inet_addr( option );
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                free( option );
            }
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            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 if ( IS_OPTION("srcaddr=") )
            {
                char *option = config_stropt( ARG_OPTION("srcaddr=") );
                i_raw_srcaddr = inet_addr( option );
                free( option );
            }
            else if ( IS_OPTION("srcport=") )
                i_raw_srcport = strtol( ARG_OPTION("srcport="), NULL, 0 );
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            else if ( IS_OPTION("fd=") )
                i_fd = strtol( ARG_OPTION("fd="), NULL, 0 );
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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 */
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    if ( i_fd < 0 )
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    {
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        if (b_raw_packets && b_host)
        { 
            RawFillHeaders(p_opt->p_raw_pktheader,
                i_raw_srcaddr, connect_addr.sin.sin_addr.s_addr, i_raw_srcport,
                ntohs(connect_addr.sin.sin_port), i_ttl, i_tos, 0);
            i_fd = socket( AF_INET, SOCK_RAW, IPPROTO_RAW );
        } else
            i_fd = socket( i_family, *pb_tcp ? SOCK_STREAM : SOCK_DGRAM, 0);

        if ( i_fd < 0 )
        {
            msg_Err( NULL, "unable to open socket (%s)", strerror(errno) );
            exit(EXIT_FAILURE);
        }
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        i = 1;
        if ( setsockopt( i_fd, SOL_SOCKET, SO_REUSEADDR, (void *)&i,
                         sizeof(i) ) == -1 )
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        {
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            msg_Err( NULL, "unable to set socket (%s)", strerror(errno) );
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            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 );
                exit(EXIT_FAILURE);
            }
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            if ( bind_addr.ss.ss_family != AF_UNSPEC )
            {
                #ifndef __APPLE__
                if ( IN6_IS_ADDR_MULTICAST( &bind_addr.sin6.sin6_addr ) )
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                {
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                    struct ipv6_mreq imr;
                    sockaddr_t bind_addr_any = bind_addr;
                    bind_addr_any.sin6.sin6_addr = in6addr_any;

                    if ( bind( i_fd, &bind_addr_any.so,
                               sizeof(bind_addr_any) ) < 0 )
                    {
                        msg_Err( NULL, "couldn't bind" );
                        PrintSocket( "socket definition:", &bind_addr,
                                     &connect_addr );
                        exit(EXIT_FAILURE);
                    }

                    imr.ipv6mr_multiaddr = bind_addr.sin6.sin6_addr;
                    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);
                    }
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                }
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                else
                #endif
                    goto normal_bind;
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            }
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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:
            if ( bind( i_fd, &bind_addr.so, i_sockaddr_len ) < 0 )
            {
                msg_Err( NULL, "couldn't bind" );
                PrintSocket( "socket definition:", &bind_addr, &connect_addr );
                exit(EXIT_FAILURE);
            }
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        }
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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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#ifdef IP_ADD_SOURCE_MEMBERSHIP /* unavailable on GNU Hurd */
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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 )
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                {
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                    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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            }
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            else
#endif
#ifndef __FreeBSD__
            if ( i_bind_if_index )
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            {
                /* 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 )
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                {
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                    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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            }
            else
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#endif
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            {
                /* 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
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                      && 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
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                      && 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 )
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    {
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        /* Open in listen mode - wait for an incoming connection */
        int i_new_fd;
        if ( listen( i_fd, 1 ) < 0 )
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        {
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            msg_Err( NULL, "couldn't listen (%s)", strerror(errno) );
            PrintSocket( "socket definition:", &bind_addr, &connect_addr );
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            exit(EXIT_FAILURE);
        }

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        while ( (i_new_fd = accept( i_fd, NULL, NULL )) < 0 )
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        {
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            if ( errno != EINTR )
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            {
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                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
 *****************************************************************************/
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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;
    }
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    else if ( !(S_ISCHR(sb.st_mode) || S_ISFIFO(sb.st_mode)) && !b_read )
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    {
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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
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 *****************************************************************************/
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char *GetAuxFile( const char *psz_arg, size_t i_payload_size )
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{
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    char *psz_aux = malloc( strlen(psz_arg) + 256 );
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    char *psz_token;

    strcpy( psz_aux, psz_arg );
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    psz_token = strrchr( psz_aux, '/' );
    if ( psz_token != NULL )
        psz_token++;
    else
        psz_token = psz_aux + 1;
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    if ( *psz_token ) psz_token++; /* Skip first character of base name */
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    /* Strip extension */
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    psz_token = strrchr( psz_token, '.' );
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    if ( psz_token ) *psz_token = '\0';
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    /* Append extension */
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    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;
}
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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,
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                         b_read ? "rb" : (b_append ? "ab" : "wb") )) == NULL )
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    {
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        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;
}

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/*****************************************************************************
 * 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")];
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    char *psz_aux_file;

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    sprintf( psz_file, "%s/%"PRIu64"."PSZ_TS_EXT, psz_dir_path, i_file );
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    psz_aux_file = GetAuxFile( psz_file, i_payload_size );

    if ( !b_read )
        CheckFileSizes( psz_file, psz_aux_file, i_payload_size );
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    i_fd = OpenFile( psz_file, b_read, !b_read );
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    if ( i_fd < 0 )
    {
        free( psz_aux_file );
        return -1;
    }
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    *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;
}