Re: [Qemu-devel] [PATCH 2/3] slirp: Handle more than 65535 blocks in TFTP transfers

[Aurelien Jarno <aurelien@aurel32.net>]

On Mon, Apr 11, 2011 at 07:10:53PM +0000, Herve Poussineau wrote:
> From: Herv? Poussineau <hpoussin@reactos.org>
> 
> RFC 1350 does not mention block count-roll over. However, a lot of TFTP servers
> implement it to be able to transmit big files, so do it also
> 
> Signed-off-by: Herv? Poussineau <hpoussin@reactos.org>
> ---
>  slirp/tftp.c |    9 +++++----
>  slirp/tftp.h |    1 +
>  2 files changed, 6 insertions(+), 4 deletions(-)

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>

> diff --git a/slirp/tftp.c b/slirp/tftp.c
> index 7ef44c9..7e63269 100644
> --- a/slirp/tftp.c
> +++ b/slirp/tftp.c
> @@ -92,7 +92,7 @@ static int tftp_session_find(Slirp *slirp, struct tftp_t *tp)
>    return -1;
>  }
>  
> -static int tftp_read_data(struct tftp_session *spt, uint16_t block_nr,
> +static int tftp_read_data(struct tftp_session *spt, uint32_t block_nr,
>                            uint8_t *buf, int len)
>  {
>    int fd;
> @@ -196,7 +196,7 @@ out:
>  }
>  
>  static int tftp_send_data(struct tftp_session *spt,
> -                          uint16_t block_nr,
> +                          uint32_t block_nr,
>  			  struct tftp_t *recv_tp)
>  {
>    struct sockaddr_in saddr, daddr;
> @@ -221,7 +221,7 @@ static int tftp_send_data(struct tftp_session *spt,
>    m->m_data += sizeof(struct udpiphdr);
>  
>    tp->tp_op = htons(TFTP_DATA);
> -  tp->x.tp_data.tp_block_nr = htons(block_nr);
> +  tp->x.tp_data.tp_block_nr = htons(block_nr & 0xffff);
>  
>    saddr.sin_addr = recv_tp->ip.ip_dst;
>    saddr.sin_port = recv_tp->udp.uh_dport;
> @@ -253,6 +253,7 @@ static int tftp_send_data(struct tftp_session *spt,
>      tftp_session_terminate(spt);
>    }
>  
> +  spt->block_nr = block_nr;
>    return 0;
>  }
>  
> @@ -407,7 +408,7 @@ static void tftp_handle_ack(Slirp *slirp, struct tftp_t *tp, int pktlen)
>    }
>  
>    if (tftp_send_data(&slirp->tftp_sessions[s],
> -		     ntohs(tp->x.tp_data.tp_block_nr) + 1,
> +		     slirp->tftp_sessions[s].block_nr + 1,
>  		     tp) < 0) {
>      return;
>    }
> diff --git a/slirp/tftp.h b/slirp/tftp.h
> index 72e5e91..471f22e 100644
> --- a/slirp/tftp.h
> +++ b/slirp/tftp.h
> @@ -36,6 +36,7 @@ struct tftp_session {
>  
>      struct in_addr client_ip;
>      uint16_t client_port;
> +    uint32_t block_nr;
>  
>      int timestamp;
>  };
> -- 
> 1.6.0.2.GIT
> 
> 
> 

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net