HAVE_SNI define in wolfssl

[afridali123]

hi,

i m running example of ./mqttclient -S "host"

i went through code and found if we define HAVE_SNI then it will take mqttCtx.host as tls host. can you please help me in where i can define HAVE_SNI , can i define in mqttclient.h file ??

[embhorn]

Hello @afridali123

The HAVE_SNI option should be defined in wolfSSL, using ./configure --enable-sni (or HAVE_SNI in the user_settings.h header).

[afridali123]

can you guide me where this user_settings.h ??

[embhorn]

How are you building the library wolfSSL?

[afridali123]

i m just using steps guide in github through make running mqttclient example

[embhorn]

Okay, great. The TLS features of wolfMQTT require wolfSSL https://github.com/wolfSSL/wolfssl

When you build wolfSSL:

./configure --enable-sni
make
sudo make install

Then wolfMQTT:

./configure
make

Then you will have access to the TLS features in wolfMQTT.

[afridali123]

that i m aware of that, but eventhough i did ./configure --enable-sni this one while running ./mqttclinet i need to pass -S by this i want to avoid that instead if HAVE_SNI is defined, then mqttCtx.host will be assigned to mTlsSnihostname

[afridali123]

i want to tell wolfssl that take mqttCtx.host as sni host, where can i define that in wolfssl library

[embhorn]

Ah... You can use the -h parameter to specify the host. The -S is for servers that require the Server Name Indicator extension.

[embhorn]

Here is an example:

HiveMQ Cloud

./examples/mqttclient/mqttclient -h 833f87e253304692bd2b911f0c18dba1.s1.eu.hivemq.cloud -t -S -u wolf1 -w NEZjcm7i8eRjFKF -p 8883

[afridali123]

i dont want to pass any parameters, i want already defined host server address in mqttCtx.host = "" in mqttclient.c

[afridali123]

where can i define HAVE_SNI in wolfssl library ??

[embhorn]

When you configure wolfSSL with --enable-sni, the define for HAVE_SNI is added to the generated file wolfssl/options.h. This file is included by the wolfMQTT library.

[afridali123]

how wolfMQTT linked to wolfssl in which file we can set this HAVE_SNI define so that wolfMQTT client example can work without any parameters

[afridali123]

but when i run ./mqttclient its not working when i run ./mqttclient -S "host name" then only its working (TLS enabled)

[embhorn]

wolfMQTT client example can work without any parameters

It sounds like you want write your own client. The simple example is very straightforward and is a good basis for your project: https://github.com/wolfSSL/wolfMQTT/tree/master/examples/mqttsimple

[afridali123]

yep i tried defining #define HAVE_SNI in mqttsimple.h and compiled code & its not working is it the right way

[afridali123]

i hope you are getting my point

[afridali123]

i want to run mqttclinet example without passing -S parameter since im already giving host in mqttCtx->host . how can i set that