개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

SSL_CTX_set_msg_callback(3)

SSL_CTX_set_msg_callback(3)         OpenSSL        SSL_CTX_set_msg_callback(3)

NAME
       SSL_CTX_set_msg_callback, SSL_CTX_set_msg_callback_arg,
       SSL_set_msg_callback, SSL_get_msg_callback_arg - install callback for
       observing protocol messages

SYNOPSIS
        #include <openssl/ssl.h>

        void SSL_CTX_set_msg_callback(SSL_CTX *ctx, void (*cb)(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg));
        void SSL_CTX_set_msg_callback_arg(SSL_CTX *ctx, void *arg);

        void SSL_set_msg_callback(SSL *ssl, void (*cb)(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg));
        void SSL_set_msg_callback_arg(SSL *ssl, void *arg);

DESCRIPTION
       SSL_CTX_set_msg_callback() or SSL_set_msg_callback() can be used to
       define a message callback function cb for observing all SSL/TLS
       protocol messages (such as handshake messages) that are received or
       sent.  SSL_CTX_set_msg_callback_arg() and SSL_set_msg_callback_arg()
       can be used to set argument arg to the callback function, which is
       available for arbitrary application use.

       SSL_CTX_set_msg_callback() and SSL_CTX_set_msg_callback_arg() specify
       default settings that will be copied to new SSL objects by SSL_new(3).
       SSL_set_msg_callback() and SSL_set_msg_callback_arg() modify the actual
       settings of an SSL object. Using a 0 pointer for cb disables the
       message callback.

       When cb is called by the SSL/TLS library for a protocol message, the
       function arguments have the following meaning:

       write_p
           This flag is 0 when a protocol message has been received and 1 when
           a protocol message has been sent.

       version
           The  protocol  version  according  to which the protocol message is
           interpreted by the library. Currently, this is one of SSL2_VERSION,
           SSL3_VERSION and TLS1_VERSION (for SSL 2.0, SSL 3.0  and  TLS  1.0,
           respectively).

       content_type
           In  the  case of SSL 2.0, this is always 0.  In the case of SSL 3.0
           or TLS 1.0, this is one of the ContentType values  defined  in  the
           protocol    specification    (change_cipher_spec(20),    alert(21),
           handshake(22); but never application_data(23) because the  callback
           will only be called for protocol messages).

       buf, len
           buf  points  to  a  buffer  containing  the protocol message, which
           consists of len bytes. The buffer is  no  longer  valid  after  the
           callback function has returned.

       ssl The SSL object that received or sent the message.

       arg The     user-defined     argument     optionally     defined     by
           SSL_CTX_set_msg_callback_arg() or SSL_set_msg_callback_arg().

NOTES
       Protocol messages are passed to the callback function after  decryption
       and  fragment  collection where applicable. (Thus record boundaries are
       not visible.)

       If processing a received protocol message  results  in  an  error,  the
       callback  function  may  not  be  called.   For  example,  the callback
       function will never see messages that are considered too  large  to  be
       processed.

       Due   to   automatic  protocol  version  negotiation,  version  is  not
       necessarily the protocol version used by the sender of the message:  If
       a  TLS  1.0  ClientHello message is received by an SSL 3.0-only server,
       version will be SSL3_VERSION.

SEE ALSO
       ssl(3), SSL_new(3)

HISTORY
       SSL_CTX_set_msg_callback(),             SSL_CTX_set_msg_callback_arg(),
       SSL_set_msg_callback()  and  SSL_get_msg_callback_arg()  were  added in
       OpenSSL 0.9.7.

1.0.2l                            2017-05-25       SSL_CTX_set_msg_callback(3)