'\" te
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.TH SASL_CLIENT_STEP 3SASL "Nov 26, 2017"
.SH NAME
sasl_client_step \- acquire an auxiliary property context
.SH SYNOPSIS
.LP
.nf
\fBcc\fR [ \fIflag\fR ... ] \fIfile\fR ... \fB-lsasl\fR   [ \fIlibrary\fR ... ]
#include <sasl/sasl.h>

\fBint\fR \fBsasl_client_step\fR(\fBsasl_conn_t *\fR\fIconn\fR, \fBconst char *\fR\fIserverin\fR,
     \fBsasl_interact_t **\fR\fBunsigned\fR \fIserverinlen\fR, \fIprompt_need\fR,
     \fBconst char **\fR\fIclientout\fR, \fBsasl_interact_t **\fR\fBunsigned *\fR\fIclientoutlen\fR);
.fi

.SH DESCRIPTION
.LP
Use the \fBsasl_client_step()\fR interface performs a step in the
authentication negotiation. \fBsasl_client_step()\fR returns \fBSASL_OK\fR if
the complete negotiation is successful. If the negotiation on step is completed
successfully, but at least one more step is required, \fBsasl_client_step()\fR
returns \fBSASL_CONTINUE\fR. A client should not assume an authentication
negotiaion is successful because the server signaled success through the
protocol. For example, if the server signaled \fBOK Authentication succeeded\fR
in IMAP, \fBsasl_client_step()\fR should be called one more time with a
\fIserverinlen\fR of zero.
.sp
.LP
If a call to \fBsasl_client_step()\fR returns \fBSASL_INTERACT\fR, the library
requires some values before \fBsasl_client_step()\fR can proceed. The
\fIprompt_need\fR structure will be filled with the requests. The application
should fulfull these requests and call \fBsasl_client_step()\fR again with
identical parameters. The \fIprompt_need\fR parameter will be the same pointer
as before, but it will have been filled in by the application.
.SH PARAMETERS
.ne 2
.na
\fB\fIconn\fR\fR
.ad
.RS 16n
The SASL connection context.
.RE

.sp
.ne 2
.na
\fB\fIserverin\fR\fR
.ad
.RS 16n
The data given by the server. The data is decoded if the protocol encodes
requests sent over the wire.
.RE

.sp
.ne 2
.na
\fB\fIserverinlen\fR\fR
.ad
.RS 16n
The length of the \fIserverin\fR.
.RE

.sp
.ne 2
.na
\fB\fIclientout\fR\fR
.ad
.br
.na
\fB\fIclientoutlen\fR\fR
.ad
.RS 16n
\fIclientout\fR and \fIclientoutlen\fR are created. They contain the initial
client response to send to the server. It is the job of the client to send them
over the network to the server. Any protocol specific encodingthat is
necessary, for example \fBbase64\fR encoding, must be done by the client.
.RE

.sp
.ne 2
.na
\fB\fIprompt_need\fR\fR
.ad
.RS 16n
A list of prompts that are needed to continue, if necessary.
.RE

.SH RETURN VALUES
.LP
\fBsasl_client_step()\fR returns an integer that corresponds to a SASL error
code.
.SH ERRORS
.ne 2
.na
\fB\fBSASL_OK\fR\fR
.ad
.RS 17n
The call to \fBsasl_client_start()\fR was successful. Authentication is
complete.
.RE

.sp
.ne 2
.na
\fB\fBSASL_CONTINUE\fR\fR
.ad
.RS 17n
The call to \fBsasl_client_start()\fR was successful, but at least one more
step is required for authentication.
.RE

.sp
.ne 2
.na
\fB\fBSASL_INTERACT\fR\fR
.ad
.RS 17n
The library requires some values before \fBsasl_client_step()\fR can proceed.
.RE

.sp
.LP
All other error codes indicate an error situation that must be handled, or the
authentication session should be quit. See \fBsasl_errors\fR(3SASL) for
information on SASL error codes.
.SH ATTRIBUTES
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Evolving
_
MT-Level	Safe
.TE

.SH SEE ALSO
.LP
\fBsasl_errors\fR(3SASL), \fBattributes\fR(5)