3 * $Id: ident.c,v 1.4 2001/06/22 19:35:39 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 1.4 2001/06/22 19:35:39 mdw
34 * New @conn_init@ interface.
36 * Revision 1.3 2000/10/08 11:17:45 mdw
37 * (ident_socket): change sizes to be @size_t@.
39 * Revision 1.2 2000/06/17 10:38:35 mdw
40 * Track changes to selbuf interface.
42 * Revision 1.1 1999/10/04 21:41:58 mdw
43 * Added ident client from `fw'.
47 /*----- Header files ------------------------------------------------------*/
54 #include <sys/types.h>
57 #include <sys/socket.h>
58 #include <netinet/in.h>
59 #include <arpa/inet.h>
68 /*----- Main code ---------------------------------------------------------*/
72 * Arguments: @char **pp@ = address of string pointer
74 * Returns: Address of next token.
76 * Use: Reads the next token from the result string. Tokens are
77 * terminated by whitespace, or `:' or `,' characters. The
78 * result string has had `\' escapes removed; it's stored in
79 * the same memory as the input string. The actual content
80 * of the delimiter doesn't seem to be interesting, so it
84 static char *next(char **pp
)
88 /* --- Deal with reads past the end of the string --- */
93 /* --- Initialize various pointers into the string --- */
97 /* --- Skip past any leading whitespace --- */
99 while (isspace((unsigned char)*p
))
102 /* --- Now start work on the string itself --- */
105 if (*p
== 0 || *p
== ':' || *p
== ',' || isspace((unsigned char)*p
))
107 else if (*p
== '\\') {
117 /* --- Tidy up afterwards --- */
119 while (isspace((unsigned char)*p
))
123 else if (*p
== ':' || *p
== ',')
134 * Arguments: @char *p@ = pointer to input string from identd
135 * @ident_reply *i@ = pointer to output block
139 * Use: Parses a result string from an RFC931 (identd) server.
142 static void parse(char *p
, ident_reply
*i
)
146 /* --- Read the source and destination port numbers --- */
148 i
->sport
= atoi(next(&p
));
149 i
->dport
= atoi(next(&p
));
151 /* --- Find out what sort of a reply this is --- */
154 if (strcmp(q
, "USERID") == 0) {
155 i
->type
= IDENT_USERID
;
156 i
->u
.userid
.os
= next(&p
);
157 i
->u
.userid
.user
= next(&p
);
158 } else if (strcmp(q
, "ERROR") == 0) {
159 i
->type
= IDENT_ERROR
;
160 i
->u
.error
= next(&p
);
167 * Arguments: @char *s@ = pointer to string from ident server
168 * @void *p@ = pointer to my request block
172 * Use: Handles a string from an ident server.
175 static void line(char *s
, void *p
)
177 ident_request
*rq
= p
;
179 rq
->state
= IDENT_DONE
;
180 close(rq
->b
.reader
.fd
);
188 selbuf_destroy(&rq
->b
);
191 /* --- @connected@ --- *
193 * Arguments: @int fd@ = file descriptor
194 * @void *p@ = pointer to request block
198 * Use: Handles a connection to a remote ident server.
201 static void connected(int fd
, void *p
)
203 ident_request
*rq
= p
;
206 /* --- Handle an error during the connect --- */
211 /* --- Initialize the string to send to the remote host --- */
214 dstr_putf(&d
, "%u, %u\r\n",
215 ntohs(rq
->remote
.sin_port
), ntohs(rq
->local
.sin_port
));
216 } CATCH
switch (exc_type
) {
224 /* --- Do the rest of the work --- */
226 if (write(fd
, d
.buf
, d
.len
) < d
.len
)
229 rq
->state
= IDENT_READ
;
230 selbuf_init(&rq
->b
, rq
->s
, fd
, line
, rq
);
233 /* --- Tidy up after misfortunes --- */
239 rq
->state
= IDENT_DONE
;
243 /* --- @ident_abort@ --- *
245 * Arguments: @ident_request *rq@ = pointer to request block
249 * Use: Cancels an ident request in progress.
252 void ident_abort(ident_request
*rq
)
259 close(rq
->b
.reader
.fd
);
260 selbuf_destroy(&rq
->b
);
267 * Arguments: @ident_request *rq@ = pointer to request block
271 * Use: Starts a connection to the remote ident server.
274 static void go(ident_request
*rq
)
277 struct sockaddr_in sin
;
280 /* --- Create the socket I'll use --- */
282 if ((fd
= socket(PF_INET
, SOCK_STREAM
, 0)) < 0)
284 memset(&sin
, 0, sizeof(sin
));
285 sin
.sin_family
= AF_INET
;
287 sin
.sin_addr
= rq
->local
.sin_addr
;
288 if (bind(fd
, (struct sockaddr
*)&sin
, sizeof(sin
)))
291 /* --- Out-of-band data would confuse us --- */
294 setsockopt(fd
, SOL_SOCKET
, SO_OOBINLINE
, &opt
, sizeof(opt
));
296 /* --- Start a connection to the remote server --- */
298 sin
.sin_family
= AF_INET
;
299 sin
.sin_port
= htons(113);
300 sin
.sin_addr
= rq
->remote
.sin_addr
;
301 if (conn_init(&rq
->c
, rq
->s
, fd
, (struct sockaddr
*)&sin
, sizeof(sin
),
305 /* --- Finish off initializing the block --- */
307 rq
->state
= IDENT_CONN
;
310 /* --- Tidy up after lossage --- */
315 rq
->state
= IDENT_DONE
;
321 * Arguments: @ident_request *rq@ = pointer to request block
322 * @sel_state *s@ = I/O multiplexor
323 * @const struct sockaddr_in *local, *remote@ = addresses
324 * @void (*func)(ident_reply *i, void *p)@ = handler function
325 * @void *p@ = argument for handler
329 * Use: Initializes an ident request.
332 void ident(ident_request
*rq
, sel_state
*s
,
333 const struct sockaddr_in
*local
,
334 const struct sockaddr_in
*remote
,
335 void (*func
)(ident_reply */
*i*/
, void */
*p*/
),
338 memcpy(&rq
->local
, local
, sizeof(rq
->local
));
339 memcpy(&rq
->remote
, remote
, sizeof(rq
->remote
));
346 /* --- @ident_socket@ --- *
348 * Arguments: @ident_request *rq@ = pointer to request block
349 * @sel_state *s@ = I/O multiplexor
350 * @int sk@ = connected socket file descriptor
351 * @void (*func)(ident_reply *i, void *p)@ = handler function
352 * @void *p@ = argument for handler
356 * Use: An alternative interface to @ident@. Initializes an ident
357 * request from a connected socket, rather than from an explicit
358 * address. This will call @getsockname@ and @getpeername@ to
359 * find out what the socket is actually connected to, which adds
360 * convenience but wastes time.
363 void ident_socket(ident_request
*rq
, sel_state
*s
, int sk
,
364 void (*func
)(ident_reply */
*i*/
, void */
*p*/
),
368 if ((sinsz
= sizeof(struct sockaddr_in
),
369 getsockname(sk
, (struct sockaddr
*)&rq
->local
, &sinsz
)) ||
370 (sinsz
= sizeof(struct sockaddr_in
),
371 getpeername(sk
, (struct sockaddr
*)&rq
->remote
, &sinsz
))) {
372 rq
->state
= IDENT_DONE
;
383 /*----- That's all, folks -------------------------------------------------*/