3 * $Id: ident.c,v 1.5 2002/01/13 13:33:15 mdw Exp $
5 * Nonblocking RFC931 client
7 * (c) 1999 Mark Wooding
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the mLib utilities library.
14 * mLib is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
19 * mLib is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with mLib; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
33 * Revision 1.5 2002/01/13 13:33:15 mdw
34 * Track interface change for @lbuf@.
36 * Revision 1.4 2001/06/22 19:35:39 mdw
37 * New @conn_init@ interface.
39 * Revision 1.3 2000/10/08 11:17:45 mdw
40 * (ident_socket): change sizes to be @size_t@.
42 * Revision 1.2 2000/06/17 10:38:35 mdw
43 * Track changes to selbuf interface.
45 * Revision 1.1 1999/10/04 21:41:58 mdw
46 * Added ident client from `fw'.
50 /*----- Header files ------------------------------------------------------*/
57 #include <sys/types.h>
60 #include <sys/socket.h>
61 #include <netinet/in.h>
62 #include <arpa/inet.h>
71 /*----- Main code ---------------------------------------------------------*/
75 * Arguments: @char **pp@ = address of string pointer
77 * Returns: Address of next token.
79 * Use: Reads the next token from the result string. Tokens are
80 * terminated by whitespace, or `:' or `,' characters. The
81 * result string has had `\' escapes removed; it's stored in
82 * the same memory as the input string. The actual content
83 * of the delimiter doesn't seem to be interesting, so it
87 static char *next(char **pp
)
91 /* --- Deal with reads past the end of the string --- */
96 /* --- Initialize various pointers into the string --- */
100 /* --- Skip past any leading whitespace --- */
102 while (isspace((unsigned char)*p
))
105 /* --- Now start work on the string itself --- */
108 if (*p
== 0 || *p
== ':' || *p
== ',' || isspace((unsigned char)*p
))
110 else if (*p
== '\\') {
120 /* --- Tidy up afterwards --- */
122 while (isspace((unsigned char)*p
))
126 else if (*p
== ':' || *p
== ',')
137 * Arguments: @char *p@ = pointer to input string from identd
138 * @ident_reply *i@ = pointer to output block
142 * Use: Parses a result string from an RFC931 (identd) server.
145 static void parse(char *p
, ident_reply
*i
)
149 /* --- Read the source and destination port numbers --- */
151 i
->sport
= atoi(next(&p
));
152 i
->dport
= atoi(next(&p
));
154 /* --- Find out what sort of a reply this is --- */
157 if (strcmp(q
, "USERID") == 0) {
158 i
->type
= IDENT_USERID
;
159 i
->u
.userid
.os
= next(&p
);
160 i
->u
.userid
.user
= next(&p
);
161 } else if (strcmp(q
, "ERROR") == 0) {
162 i
->type
= IDENT_ERROR
;
163 i
->u
.error
= next(&p
);
170 * Arguments: @char *s@ = pointer to string from ident server
171 * @size_t len@ = length of the line
172 * @void *p@ = pointer to my request block
176 * Use: Handles a string from an ident server.
179 static void line(char *s
, size_t len
, void *p
)
181 ident_request
*rq
= p
;
183 rq
->state
= IDENT_DONE
;
184 close(rq
->b
.reader
.fd
);
192 selbuf_destroy(&rq
->b
);
195 /* --- @connected@ --- *
197 * Arguments: @int fd@ = file descriptor
198 * @void *p@ = pointer to request block
202 * Use: Handles a connection to a remote ident server.
205 static void connected(int fd
, void *p
)
207 ident_request
*rq
= p
;
210 /* --- Handle an error during the connect --- */
215 /* --- Initialize the string to send to the remote host --- */
218 dstr_putf(&d
, "%u, %u\r\n",
219 ntohs(rq
->remote
.sin_port
), ntohs(rq
->local
.sin_port
));
220 } CATCH
switch (exc_type
) {
228 /* --- Do the rest of the work --- */
230 if (write(fd
, d
.buf
, d
.len
) < d
.len
)
233 rq
->state
= IDENT_READ
;
234 selbuf_init(&rq
->b
, rq
->s
, fd
, line
, rq
);
237 /* --- Tidy up after misfortunes --- */
243 rq
->state
= IDENT_DONE
;
247 /* --- @ident_abort@ --- *
249 * Arguments: @ident_request *rq@ = pointer to request block
253 * Use: Cancels an ident request in progress.
256 void ident_abort(ident_request
*rq
)
263 close(rq
->b
.reader
.fd
);
264 selbuf_destroy(&rq
->b
);
271 * Arguments: @ident_request *rq@ = pointer to request block
275 * Use: Starts a connection to the remote ident server.
278 static void go(ident_request
*rq
)
281 struct sockaddr_in sin
;
284 /* --- Create the socket I'll use --- */
286 if ((fd
= socket(PF_INET
, SOCK_STREAM
, 0)) < 0)
288 memset(&sin
, 0, sizeof(sin
));
289 sin
.sin_family
= AF_INET
;
291 sin
.sin_addr
= rq
->local
.sin_addr
;
292 if (bind(fd
, (struct sockaddr
*)&sin
, sizeof(sin
)))
295 /* --- Out-of-band data would confuse us --- */
298 setsockopt(fd
, SOL_SOCKET
, SO_OOBINLINE
, &opt
, sizeof(opt
));
300 /* --- Start a connection to the remote server --- */
302 sin
.sin_family
= AF_INET
;
303 sin
.sin_port
= htons(113);
304 sin
.sin_addr
= rq
->remote
.sin_addr
;
305 if (conn_init(&rq
->c
, rq
->s
, fd
, (struct sockaddr
*)&sin
, sizeof(sin
),
309 /* --- Finish off initializing the block --- */
311 rq
->state
= IDENT_CONN
;
314 /* --- Tidy up after lossage --- */
319 rq
->state
= IDENT_DONE
;
325 * Arguments: @ident_request *rq@ = pointer to request block
326 * @sel_state *s@ = I/O multiplexor
327 * @const struct sockaddr_in *local, *remote@ = addresses
328 * @void (*func)(ident_reply *i, void *p)@ = handler function
329 * @void *p@ = argument for handler
333 * Use: Initializes an ident request.
336 void ident(ident_request
*rq
, sel_state
*s
,
337 const struct sockaddr_in
*local
,
338 const struct sockaddr_in
*remote
,
339 void (*func
)(ident_reply */
*i*/
, void */
*p*/
),
342 memcpy(&rq
->local
, local
, sizeof(rq
->local
));
343 memcpy(&rq
->remote
, remote
, sizeof(rq
->remote
));
350 /* --- @ident_socket@ --- *
352 * Arguments: @ident_request *rq@ = pointer to request block
353 * @sel_state *s@ = I/O multiplexor
354 * @int sk@ = connected socket file descriptor
355 * @void (*func)(ident_reply *i, void *p)@ = handler function
356 * @void *p@ = argument for handler
360 * Use: An alternative interface to @ident@. Initializes an ident
361 * request from a connected socket, rather than from an explicit
362 * address. This will call @getsockname@ and @getpeername@ to
363 * find out what the socket is actually connected to, which adds
364 * convenience but wastes time.
367 void ident_socket(ident_request
*rq
, sel_state
*s
, int sk
,
368 void (*func
)(ident_reply */
*i*/
, void */
*p*/
),
372 if ((sinsz
= sizeof(struct sockaddr_in
),
373 getsockname(sk
, (struct sockaddr
*)&rq
->local
, &sinsz
)) ||
374 (sinsz
= sizeof(struct sockaddr_in
),
375 getpeername(sk
, (struct sockaddr
*)&rq
->remote
, &sinsz
))) {
376 rq
->state
= IDENT_DONE
;
387 /*----- That's all, folks -------------------------------------------------*/