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Add basic first tests for MTU setting

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For now, just check that it causes us to fragment. More tests are coming in
follow-up commits to ensure we respect the exact value set, including when
renegotiating.
This commit is contained in:
Manuel Pégourié-Gonnard
2018-08-12 13:28:53 +02:00
parent 637e234d9f
commit b747c6cf9b
4 changed files with 103 additions and 6 deletions
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15
programs/ssl/ssl_server2.c
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@ -150,6 +150,7 @@ int main( void )
#define DFL_ANTI_REPLAY -1
#define DFL_HS_TO_MIN 0
#define DFL_HS_TO_MAX 0
#define DFL_DTLS_MTU -1
#define DFL_BADMAC_LIMIT -1
#define DFL_EXTENDED_MS -1
#define DFL_ETM -1
@ -297,7 +298,8 @@ int main( void )
#define USAGE_DTLS \
" dtls=%%d default: 0 (TLS)\n" \
" hs_timeout=%%d-%%d default: (library default: 1000-60000)\n" \
" range of DTLS handshake timeouts in millisecs\n"
" range of DTLS handshake timeouts in millisecs\n" \
" mtu=%%d default: (library default: unlimited)\n"
#else
#define USAGE_DTLS ""
#endif
@ -470,6 +472,7 @@ struct options
int anti_replay; /* Use anti-replay for DTLS? -1 for default */
uint32_t hs_to_min; /* Initial value of DTLS handshake timer */
uint32_t hs_to_max; /* Max value of DTLS handshake timer */
int dtls_mtu; /* UDP Maximum tranport unit for DTLS */
int badmac_limit; /* Limit of records with bad MAC */
} opt;
@ -1338,6 +1341,7 @@ int main( int argc, char *argv[] )
opt.anti_replay = DFL_ANTI_REPLAY;
opt.hs_to_min = DFL_HS_TO_MIN;
opt.hs_to_max = DFL_HS_TO_MAX;
opt.dtls_mtu = DFL_DTLS_MTU;
opt.badmac_limit = DFL_BADMAC_LIMIT;
opt.extended_ms = DFL_EXTENDED_MS;
opt.etm = DFL_ETM;
@ -1684,6 +1688,12 @@ int main( int argc, char *argv[] )
if( opt.hs_to_min == 0 || opt.hs_to_max < opt.hs_to_min )
goto usage;
}
else if( strcmp( p, "mtu" ) == 0 )
{
opt.dtls_mtu = atoi( q );
if( opt.dtls_mtu < 0 )
goto usage;
}
else if( strcmp( p, "sni" ) == 0 )
{
opt.sni = q;
@ -2155,6 +2165,9 @@ int main( int argc, char *argv[] )
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if( opt.hs_to_min != DFL_HS_TO_MIN || opt.hs_to_max != DFL_HS_TO_MAX )
mbedtls_ssl_conf_handshake_timeout( &conf, opt.hs_to_min, opt.hs_to_max );
if( opt.dtls_mtu != DFL_DTLS_MTU )
mbedtls_ssl_conf_mtu( &conf, opt.dtls_mtu );
#endif /* MBEDTLS_SSL_PROTO_DTLS */
#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)