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Updates to s_client and s_server to remove the constant 28 (for IPv4 header

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and UDP header) when setting an mtu. This constant is not always correct (e.g.
if using IPv6). Use the new DTLS_CTRL functions instead.

Reviewed-by: Tim Hudson <tjh@openssl.org>
This commit is contained in:
Matt Caswell 2014-12-01 23:57:44 +00:00
parent d3d9eef316
commit 464ce92026
2 changed files with 30 additions and 4 deletions
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16
apps/s_client.c
View file

@ -1529,10 +1529,22 @@ re_start:
BIO_ctrl(sbio, BIO_CTRL_DGRAM_SET_SEND_TIMEOUT, 0, &timeout);
}
if (socket_mtu > 28)
if (socket_mtu)
{
if(socket_mtu < DTLS_get_link_min_mtu(con))
{
BIO_printf(bio_err,"MTU too small. Must be at least %ld\n",
DTLS_get_link_min_mtu(con));
BIO_free(sbio);
goto shut;
}
SSL_set_options(con, SSL_OP_NO_QUERY_MTU);
SSL_set_mtu(con, socket_mtu - 28);
if(!DTLS_set_link_mtu(con, socket_mtu))
{
BIO_printf(bio_err, "Failed to set MTU\n");
BIO_free(sbio);
goto shut;
}
}
else
/* want to do MTU discovery */

18
apps/s_server.c
View file

@ -2302,10 +2302,24 @@ static int sv_body(char *hostname, int s, int stype, unsigned char *context)
BIO_ctrl(sbio, BIO_CTRL_DGRAM_SET_SEND_TIMEOUT, 0, &timeout);
}
if (socket_mtu > 28)
if (socket_mtu)
{
if(socket_mtu < DTLS_get_link_min_mtu(con))
{
BIO_printf(bio_err,"MTU too small. Must be at least %ld\n",
DTLS_get_link_min_mtu(con));
ret = -1;
BIO_free(sbio);
goto err;
}
SSL_set_options(con, SSL_OP_NO_QUERY_MTU);
SSL_set_mtu(con, socket_mtu - 28);
if(!DTLS_set_link_mtu(con, socket_mtu))
{
BIO_printf(bio_err, "Failed to set MTU\n");
ret = -1;
BIO_free(sbio);
goto err;
}
}
else
/* want to do MTU discovery */