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Edit File : SSL_select_next_proto.3ssl \| Size : 9.23 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" SSL_CTX_set_alpn_protos, SSL_set_alpn_protos, SSL_CTX_set_alpn_select_cb, SSL_select_next_proto, SSL_get0_alpn_selected \- handle application layer protocol negotiation (ALPN) .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ssl.h> \& \& int SSL_CTX_set_alpn_protos(SSL_CTX ctx, const unsigned char protos, \& unsigned protos_len); \& int SSL_set_alpn_protos(SSL ssl, const unsigned char protos, \& unsigned protos_len); \& void SSL_CTX_set_alpn_select_cb(SSL_CTX ctx, \& int (cb) (SSL ssl, \& const unsigned char *out, \& unsigned char outlen, \& const unsigned char in, \& unsigned int inlen, \& void arg), void arg); \& int SSL_select_next_proto(unsigned char out, unsigned char outlen, \& const unsigned char server, \& unsigned int server_len, \& const unsigned char client, \& unsigned int client_len) \& void SSL_get0_alpn_selected(const SSL ssl, const unsigned char data, \& unsigned int len); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_CTX_set_alpn_protos()\fR and \fBSSL_set_alpn_protos()\fR are used by the client to set the list of protocols available to be negotiated. The \fBprotos\fR must be in protocol-list format, described below. The length of \fBprotos\fR is specified in \&\fBprotos_len\fR. .PP \&\fBSSL_CTX_set_alpn_select_cb()\fR sets the application callback \fBcb\fR used by a server to select which protocol to use for the incoming connection. When \fBcb\fR is \s-1NULL, ALPN\s0 is not used. The \fBarg\fR value is a pointer which is passed to the application callback. .PP \&\fBcb\fR is the application defined callback. The \fBin\fR, \fBinlen\fR parameters are a vector in protocol-list format. The value of the \fBout\fR, \fBoutlen\fR vector should be set to the value of a single protocol selected from the \fBin\fR, \&\fBinlen\fR vector. The \fBarg\fR parameter is the pointer set via \&\fBSSL_CTX_set_alpn_select_cb()\fR. .PP \&\fBSSL_select_next_proto()\fR is a helper function used to select protocols. It implements the standard protocol selection. It is expected that this function is called from the application callback \fBcb\fR. The protocol data in \fBserver\fR, \&\fBserver_len\fR and \fBclient\fR, \fBclient_len\fR must be in the protocol-list format described below. The first item in the \fBserver\fR, \fBserver_len\fR list that matches an item in the \fBclient\fR, \fBclient_len\fR list is selected, and returned in \fBout\fR, \fBoutlen\fR. The \fBout\fR value will point into either \fBserver\fR or \&\fBclient\fR, so it should be copied immediately. If no match is found, the first item in \fBclient\fR, \fBclient_len\fR is returned in \fBout\fR, \fBoutlen\fR. This function can also be used in the \s-1NPN\s0 callback. .PP \&\fBSSL_get0_alpn_selected()\fR returns a pointer to the selected protocol in \fBdata\fR with length \fBlen\fR. It is not NUL-terminated. \fBdata\fR is set to \s-1NULL\s0 and \fBlen\fR is set to 0 if no protocol has been selected. \fBdata\fR must not be freed. .SH "NOTES" .IX Header "NOTES" The protocol-lists must be in wire-format, which is defined as a vector of non-empty, 8\-bit length-prefixed, byte strings. The length-prefix byte is not included in the length. Each string is limited to 255 bytes. A byte-string length of 0 is invalid. A truncated byte-string is invalid. The length of the vector is not in the vector itself, but in a separate variable. .PP Example: .PP .Vb 5 \& unsigned char vector[] = { \& 6, \(Aqs\(Aq, \(Aqp\(Aq, \(Aqd\(Aq, \(Aqy\(Aq, \(Aq/\(Aq, \(Aq1\(Aq, \& 8, \(Aqh\(Aq, \(Aqt\(Aq, \(Aqt\(Aq, \(Aqp\(Aq, \(Aq/\(Aq, \(Aq1\(Aq, \(Aq.\(Aq, \(Aq1\(Aq \& }; \& unsigned int length = sizeof(vector); .Ve .PP The \s-1ALPN\s0 callback is executed after the servername callback; as that servername callback may update the \s-1SSL_CTX,\s0 and subsequently, the \s-1ALPN\s0 callback. .PP If there is no \s-1ALPN\s0 proposed in the ClientHello, the \s-1ALPN\s0 callback is not invoked. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBSSL_CTX_set_alpn_protos()\fR and \fBSSL_set_alpn_protos()\fR return 0 on success, and non\-0 on failure. \s-1WARNING:\s0 these functions reverse the return value convention. .PP \&\fBSSL_select_next_proto()\fR returns one of the following: .IP "\s-1OPENSSL_NPN_NEGOTIATED\s0" 4 .IX Item "OPENSSL_NPN_NEGOTIATED" A match was found and is returned in \fBout\fR, \fBoutlen\fR. .IP "\s-1OPENSSL_NPN_NO_OVERLAP\s0" 4 .IX Item "OPENSSL_NPN_NO_OVERLAP" No match was found. The first item in \fBclient\fR, \fBclient_len\fR is returned in \&\fBout\fR, \fBoutlen\fR. .PP The \s-1ALPN\s0 select callback \fBcb\fR, must return one of the following: .IP "\s-1SSL_TLSEXT_ERR_OK\s0" 4 .IX Item "SSL_TLSEXT_ERR_OK" \&\s-1ALPN\s0 protocol selected. .IP "\s-1SSL_TLSEXT_ERR_NOACK\s0" 4 .IX Item "SSL_TLSEXT_ERR_NOACK" \&\s-1ALPN\s0 protocol not selected. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBssl\fR\\|(3), \fBSSL_CTX_set_tlsext_servername_callback\fR\\|(3), \&\fBSSL_CTX_set_tlsext_servername_arg\fR\\|(3) Back

Edit File : SSL_select_next_proto.3ssl | Size : 9.23 KB

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.\" ========================================================================
.\"
.IX Title "SSL_CTX_set_alpn_select_cb 3"
.TH SSL_CTX_set_alpn_select_cb 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
SSL_CTX_set_alpn_protos, SSL_set_alpn_protos, SSL_CTX_set_alpn_select_cb,
SSL_select_next_proto, SSL_get0_alpn_selected \- handle application layer
protocol negotiation (ALPN)
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& int SSL_CTX_set_alpn_protos(SSL_CTX *ctx, const unsigned char *protos,
\&                             unsigned protos_len);
\& int SSL_set_alpn_protos(SSL *ssl, const unsigned char *protos,
\&                         unsigned protos_len);
\& void SSL_CTX_set_alpn_select_cb(SSL_CTX *ctx,
\&                                 int (*cb) (SSL *ssl,
\&                                            const unsigned char **out,
\&                                            unsigned char *outlen,
\&                                            const unsigned char *in,
\&                                            unsigned int inlen,
\&                                            void *arg), void *arg);
\& int SSL_select_next_proto(unsigned char **out, unsigned char *outlen,
\&                           const unsigned char *server,
\&                           unsigned int server_len,
\&                           const unsigned char *client,
\&                           unsigned int client_len)
\& void SSL_get0_alpn_selected(const SSL *ssl, const unsigned char **data,
\&                             unsigned int *len);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_CTX_set_alpn_protos()\fR and \fBSSL_set_alpn_protos()\fR are used by the client to
set the list of protocols available to be negotiated. The \fBprotos\fR must be in
protocol-list format, described below. The length of \fBprotos\fR is specified in
\&\fBprotos_len\fR.
.PP
\&\fBSSL_CTX_set_alpn_select_cb()\fR sets the application callback \fBcb\fR used by a
server to select which protocol to use for the incoming connection. When \fBcb\fR
is \s-1NULL, ALPN\s0 is not used. The \fBarg\fR value is a pointer which is passed to
the application callback.
.PP
\&\fBcb\fR is the application defined callback. The \fBin\fR, \fBinlen\fR parameters are a
vector in protocol-list format. The value of the \fBout\fR, \fBoutlen\fR vector
should be set to the value of a single protocol selected from the \fBin\fR,
\&\fBinlen\fR vector. The \fBarg\fR parameter is the pointer set via
\&\fBSSL_CTX_set_alpn_select_cb()\fR.
.PP
\&\fBSSL_select_next_proto()\fR is a helper function used to select protocols. It
implements the standard protocol selection. It is expected that this function
is called from the application callback \fBcb\fR. The protocol data in \fBserver\fR,
\&\fBserver_len\fR and \fBclient\fR, \fBclient_len\fR must be in the protocol-list format
described below. The first item in the \fBserver\fR, \fBserver_len\fR list that
matches an item in the \fBclient\fR, \fBclient_len\fR list is selected, and returned
in \fBout\fR, \fBoutlen\fR. The \fBout\fR value will point into either \fBserver\fR or
\&\fBclient\fR, so it should be copied immediately. If no match is found, the first
item in \fBclient\fR, \fBclient_len\fR is returned in \fBout\fR, \fBoutlen\fR. This
function can also be used in the \s-1NPN\s0 callback.
.PP
\&\fBSSL_get0_alpn_selected()\fR returns a pointer to the selected protocol in \fBdata\fR
with length \fBlen\fR. It is not NUL-terminated. \fBdata\fR is set to \s-1NULL\s0 and \fBlen\fR
is set to 0 if no protocol has been selected. \fBdata\fR must not be freed.
.SH "NOTES"
.IX Header "NOTES"
The protocol-lists must be in wire-format, which is defined as a vector of
non-empty, 8\-bit length-prefixed, byte strings. The length-prefix byte is not
included in the length. Each string is limited to 255 bytes. A byte-string
length of 0 is invalid. A truncated byte-string is invalid. The length of the
vector is not in the vector itself, but in a separate variable.
.PP
Example:
.PP
.Vb 5
\& unsigned char vector[] = {
\&     6, \*(Aqs\*(Aq, \*(Aqp\*(Aq, \*(Aqd\*(Aq, \*(Aqy\*(Aq, \*(Aq/\*(Aq, \*(Aq1\*(Aq,
\&     8, \*(Aqh\*(Aq, \*(Aqt\*(Aq, \*(Aqt\*(Aq, \*(Aqp\*(Aq, \*(Aq/\*(Aq, \*(Aq1\*(Aq, \*(Aq.\*(Aq, \*(Aq1\*(Aq
\& };
\& unsigned int length = sizeof(vector);
.Ve
.PP
The \s-1ALPN\s0 callback is executed after the servername callback; as that servername
callback may update the \s-1SSL_CTX,\s0 and subsequently, the \s-1ALPN\s0 callback.
.PP
If there is no \s-1ALPN\s0 proposed in the ClientHello, the \s-1ALPN\s0 callback is not
invoked.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBSSL_CTX_set_alpn_protos()\fR and \fBSSL_set_alpn_protos()\fR return 0 on success, and
non\-0 on failure. \s-1WARNING:\s0 these functions reverse the return value convention.
.PP
\&\fBSSL_select_next_proto()\fR returns one of the following:
.IP "\s-1OPENSSL_NPN_NEGOTIATED\s0" 4
.IX Item "OPENSSL_NPN_NEGOTIATED"
A match was found and is returned in \fBout\fR, \fBoutlen\fR.
.IP "\s-1OPENSSL_NPN_NO_OVERLAP\s0" 4
.IX Item "OPENSSL_NPN_NO_OVERLAP"
No match was found. The first item in \fBclient\fR, \fBclient_len\fR is returned in
\&\fBout\fR, \fBoutlen\fR.
.PP
The \s-1ALPN\s0 select callback \fBcb\fR, must return one of the following:
.IP "\s-1SSL_TLSEXT_ERR_OK\s0" 4
.IX Item "SSL_TLSEXT_ERR_OK"
\&\s-1ALPN\s0 protocol selected.
.IP "\s-1SSL_TLSEXT_ERR_NOACK\s0" 4
.IX Item "SSL_TLSEXT_ERR_NOACK"
\&\s-1ALPN\s0 protocol not selected.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(3), \fBSSL_CTX_set_tlsext_servername_callback\fR\|(3),
\&\fBSSL_CTX_set_tlsext_servername_arg\fR\|(3)

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