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IMCLIENT(3)
NAME
imclient library - authenticating callback interface to IMAP/IMSP servers
SYNOPSIS
#include <cyrus/imclient.h>
int imclient_connect(struct imclient **imclient, const char *host, const
char *port
void imclient_close (struct imclient *imclient);
void imclient_setflags(struct imclient *imclient, intflags);
void imclient_clearflags (struct imclient *imclient, intflags);
char* imclient_servername (struct imclient *imclient);
void imclient_addcallback (struct imclient * imclient ,...);
void imclient_send (struct imclient *imclient, void (*finishproc)(), void
*finishrock
void imclient_getselectinfo (struct imclient *imclient, int *fd, int *
wanttowrite
void imclient_processoneevent (struct imclient *imclient);
int imclient_authenticate (struct imclient *imclient, struct sasl_client
**availmech, const char *service
DESCRIPTION
The imclient library functions are distributed with Cyrus IMAP and IMSP.
These functions are used for building IMAP/IMSP client software. These
functions handle Kerberos authentication and can set callbacks based on the
keyword in untagged replies or based on the command tag at the end of
command replies.
Users must link with the -lcyrus switch, and must supply a function called
fatal to be called in case of any error within libcyrus.a.
All of the imclient functions begin with the prefix imclient and takes an
argument of type struct imclient * as the first argument which is
initialized by imclient_connect and freed by imclient_close.
See below for a description of each function.
imclient_connect()
Connects the client server to the host. If successful, it returns 0
and sets the imclient argument to a pointer to an imclient struct. The
imclient struct represents the current connection, flags, and
callbacks. On failure, the current errno is returned if a system call
failed, -1 is returned if the host name was not found, and -2 is
returned if the service name was not found.
imclient_close()
Closes and frees the imclient connection.
imclient_setflags()
Sets the flags specified by the flags argument on the imclient
connection. Currently the only flag allowed is
IMCLIENT_CONN_NONSYNCLITERAL (this flag indicates that the server
supports non-synchronizing literals described by the LITERAL+
extension).
imclient_clearflags()
Clears the flags specified by the flags argument on the imclient
connection.
imclient_servername()
Returns a char * pointer to the name of the server connected to by
imclient.
imclient_addcallback()
Adds an untagged data callback to the imclient connection. The
function imclient_addcallback takes callbacks of the type
imclient_proc_t which is defined to be:
typedef void imclient_proc_t (struct imclient *imclient, void
*rock, struct imclient_reply *reply);
and struct imclient_reply * is defined to be:
struct imclient_reply {
char *keyword;
long msgno;
char *text;
};
After the first argument imclient, there can be zero or more instances
of the set of keyword, flags, proc, and rock, each adding or changing
a single callback. Each instance adds or changes the callback for
keyword. The argument, flags, specifies information about the parsing
of the untagged data. proc and rock specify the callback function and
rock to invoke when the untagged data is received. proc may be a null
pointer, in which case no function is invoked. The callback function
may not call the functions imclient_close(), imclient_send(),
imclient_eof(), imclient_processoneevent(), or imclient_authenticate()
on the connection. The callback function may over write the text of
untagged data.
imclient_send()
Sends a new command to the imclient connection. finishproc and
finnishrock are the function and rock called when the command
completes. functionproc may be a null pointer, in which case no
callback is made. The call back function may not call the functions
imclient_close(), imclient_send(), imclient_eof(),
imclient_processoneevent(), or imclient_authenticate() on the
connection. The argument, fmt , is a print like specification of the
command. It must not include the tag as the tag is automatically added
by imclient_send(). The defined %-sequences are:
%% for %
%a for an IMAP atom
%s for an astring (which will be quoted or literalized as
needed)
%d for a decimal
%u for an unsigned decimal
%v for #astring (argument is a null-terminated array of char *
which are written as space separated astrings)
imclient_getselectinfo()
Gets the information for calling select(2). fd is filled in with the
file descriptor to select(2) for read. wanttowrite is filled in with
a nonzero value if select should be used for write as well.
imclient_processoneevent()
Processes one input or output event on the imclient connection.
imclient_authenticate()
Authenticates the imclient connection using one of the mechanisms in
availmech. The argument, user, if not NULL, specifies the user to
authenticate as. If the user is NULL, the current user is used. The
argument protallowed is a bitmask of permissible protection
mechanisms.
On success, 0 is returned. On failure (i.e., "BAD" keyboard, or no
authentication mechanisms worked), 1 is returned. On extreme failure
(premature "OK"), 2 is returned.
EXAMPLES
The following code is a possible skeletion of imclient that relies on
Kerberos to do authentication. This code preforms an IMAP CAPABILITY
request and prints out the result.
struct sasl_client;
#include <cyrus/xmalloc.h> /* example uses xstrdup */
#include <cyrus/sasl.h>
#include <cyrus/imclient.h>
#include <stdio.h>
extern struct sasl_client krb_sasl_client;
struct sasl_client *login_sasl_client[] = {
&krb_sasl_client,
NULL
};
struct imclient *imclient;
char server[] = "cyrus.andrew.cmu.edu" ;
char port[] = "imap";
void fatal(char* message, int rc) {
fprintf(stderr, "fatal error: %s\n", message);
exit(rc);
}
static void callback_capability(struct imclient *imclient,
void *rock,
struct imclient_reply *reply) {
if (reply->text != NULL) {
*((char**)rock) = xstrdup( reply->text );
}
}
static void end_command (struct imclient *connection, void*
rock, struct imclient_reply *inmsg) {
(*(int*)rock)--;
}
main() {
char* capability_string;
int nc;
if (imclient_connect(&imclient, server, port)) {
fprintf(stderr,
"error: Couldn't connect to %s %s\n",
server, port);
exit(1);
}
if (imclient_authenticate(imclient, login_sasl_client, "imap"
/* service */,
NULL /* user */, SASL_PROT_ANY)) {
exit(1);
}
imclient_addcallback(imclient, "CAPABILITY",
CALLBACK_NOLITERAL,
callback_capability,
&capability_string,
NULL);
nc = 1;
imclient_send(imclient, end_command,
(void*) &nc, "CAPABILITY");
while(nc > 0) {
imclient_processoneevent(imclient);
}
if (strstr("LITERAL+", capability_string)) {
imclient_setflags(imclient, IMCLIENT_CONN_NONSYNCLITERAL);
}
imclient_send(imclient, NULL, NULL, "LOGOUT");
imclient_close(imclient);
printf("capability text is: %s\n", capability_string);
free(capability_string);
}
BUGS
No known bugs.
SEE ALSO
cyradm, imapd, imspd, RFC2033 (IMAP LITERAL+ extension), RFC2060 (IMAP4rev1
specification), and select(2)
KEYWORDS
IMAP, ACAP, IMSP, Kerberos, Authentication
COPYRIGHT
Copyright 1997, Carnegie Mellon University. All Rights Reserved.
This software is made available for academic and research purposes only.
No commercial license is hereby granted. Copying and other reproduction is
authorized only for research, education, and other non-commercial purposes.
No warranties, either expressed or implied, are made regarding the
operation, use, or results of the software. Such a release does not permit
use of the code for commercial purposes or benefits by anyone without
specific, additional permission by the owner of the code.
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Index for
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Alphabetical
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