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NAME

SSL_do_handshake - perform a TLS/SSL handshake
 

SYNOPSIS

 #include <openssl/ssl.h>

 int SSL_do_handshake(SSL *ssl);

DESCRIPTION

NOTES

If the underlying BIO is blocking, SSL_do_handshake() will only return once the handshake has been finished or an error occurred, except for SGC (Server Gated Cryptography). For SGC, SSL_do_handshake() may return with -1, but SSL_get_error() will yield SSL_ERROR_WANT_READ/WRITE and SSL_do_handshake() should be called again.

If the underlying BIO is non-blocking, SSL_do_handshake() will also return when the underlying BIO could not satisfy the needs of SSL_do_handshake() to continue the handshake. In this case a call to SSL_get_error() with the return value of SSL_do_handshake() will yield SSL_ERROR_WANT_READ or SSL_ERROR_WANT_WRITE. The calling process then must repeat the call after taking appropriate action to satisfy the needs of SSL_do_handshake(). The action depends on the underlying BIO. When using a non-blocking socket, nothing is to be done, but select() can be used to check for the required condition. When using a buffering BIO, like a BIO pair, data must be written into or retrieved out of the BIO before being able to continue.  

RETURN VALUES

1

The TLS/SSL handshake was successfully completed, a TLS/SSL connection has been established.

0

The TLS/SSL handshake was not successful but was shut down controlled and by the specifications of the TLS/SSL protocol. Call SSL_get_error() with the return value ret to find out the reason.

<0

The TLS/SSL handshake was not successful because a fatal error occurred either at the protocol level or a connection failure occurred. The shutdown was not clean. It can also occur of action is need to continue the operation for non-blocking BIOs. Call SSL_get_error() with the return value ret to find out the reason.

SEE ALSO

Index

NAME

SYNOPSIS

DESCRIPTION

NOTES

RETURN VALUES

SEE ALSO

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