3 * Nonblocking RFC931 client
5 * (c) 1999 Mark Wooding
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of the mLib utilities library.
12 * mLib is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Library General Public License as
14 * published by the Free Software Foundation; either version 2 of the
15 * License, or (at your option) any later version.
17 * mLib is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Library General Public License for more details.
22 * You should have received a copy of the GNU Library General Public
23 * License along with mLib; if not, write to the Free
24 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
28 /*----- Header files ------------------------------------------------------*/
35 #include <sys/types.h>
38 #include <sys/socket.h>
39 #include <netinet/in.h>
40 #include <arpa/inet.h>
50 /*----- Main code ---------------------------------------------------------*/
54 * Arguments: @char **pp@ = address of string pointer
56 * Returns: Address of next token.
58 * Use: Reads the next token from the result string. Tokens are
59 * terminated by whitespace, or `:' or `,' characters. The
60 * result string has had `\' escapes removed; it's stored in
61 * the same memory as the input string. The actual content
62 * of the delimiter doesn't seem to be interesting, so it
66 static char *next(char **pp
)
70 /* --- Deal with reads past the end of the string --- */
75 /* --- Initialize various pointers into the string --- */
79 /* --- Skip past any leading whitespace --- */
84 /* --- Now start work on the string itself --- */
87 if (*p
== 0 || *p
== ':' || *p
== ',' || ISSPACE(*p
))
89 else if (*p
== '\\') {
99 /* --- Tidy up afterwards --- */
105 else if (*p
== ':' || *p
== ',')
116 * Arguments: @char *p@ = pointer to input string from identd
117 * @ident_reply *i@ = pointer to output block
121 * Use: Parses a result string from an RFC931 (identd) server.
124 static void parse(char *p
, ident_reply
*i
)
128 /* --- Read the source and destination port numbers --- */
130 i
->sport
= atoi(next(&p
));
131 i
->dport
= atoi(next(&p
));
133 /* --- Find out what sort of a reply this is --- */
136 if (STRCMP(q
, ==, "USERID")) {
137 i
->type
= IDENT_USERID
;
138 i
->u
.userid
.os
= next(&p
);
139 i
->u
.userid
.user
= next(&p
);
140 } else if (STRCMP(q
, ==, "ERROR")) {
141 i
->type
= IDENT_ERROR
;
142 i
->u
.error
= next(&p
);
149 * Arguments: @char *s@ = pointer to string from ident server
150 * @size_t len@ = length of the line
151 * @void *p@ = pointer to my request block
155 * Use: Handles a string from an ident server.
158 static void line(char *s
, size_t len
, void *p
)
160 ident_request
*rq
= p
;
162 rq
->state
= IDENT_DONE
;
163 close(rq
->b
.reader
.fd
);
171 selbuf_destroy(&rq
->b
);
174 /* --- @connected@ --- *
176 * Arguments: @int fd@ = file descriptor
177 * @void *p@ = pointer to request block
181 * Use: Handles a connection to a remote ident server.
184 static void connected(int fd
, void *p
)
186 ident_request
*rq
= p
;
189 /* --- Handle an error during the connect --- */
194 /* --- Initialize the string to send to the remote host --- */
197 dstr_putf(&d
, "%u, %u\r\n",
198 ntohs(rq
->remote
.sin_port
), ntohs(rq
->local
.sin_port
));
199 } CATCH
switch (exc_type
) {
207 /* --- Do the rest of the work --- */
209 if (write(fd
, d
.buf
, d
.len
) < d
.len
)
212 rq
->state
= IDENT_READ
;
213 selbuf_init(&rq
->b
, rq
->s
, fd
, line
, rq
);
216 /* --- Tidy up after misfortunes --- */
222 rq
->state
= IDENT_DONE
;
226 /* --- @ident_abort@ --- *
228 * Arguments: @ident_request *rq@ = pointer to request block
232 * Use: Cancels an ident request in progress.
235 void ident_abort(ident_request
*rq
)
242 close(rq
->b
.reader
.fd
);
243 selbuf_destroy(&rq
->b
);
250 * Arguments: @ident_request *rq@ = pointer to request block
254 * Use: Starts a connection to the remote ident server.
257 static void go(ident_request
*rq
)
260 struct sockaddr_in sin
;
263 /* --- Create the socket I'll use --- */
265 if ((fd
= socket(PF_INET
, SOCK_STREAM
, 0)) < 0)
267 memset(&sin
, 0, sizeof(sin
));
268 sin
.sin_family
= AF_INET
;
270 sin
.sin_addr
= rq
->local
.sin_addr
;
271 if (bind(fd
, (struct sockaddr
*)&sin
, sizeof(sin
)))
274 /* --- Out-of-band data would confuse us --- */
277 setsockopt(fd
, SOL_SOCKET
, SO_OOBINLINE
, &opt
, sizeof(opt
));
279 /* --- Start a connection to the remote server --- */
281 sin
.sin_family
= AF_INET
;
282 sin
.sin_port
= htons(113);
283 sin
.sin_addr
= rq
->remote
.sin_addr
;
284 if (conn_init(&rq
->c
, rq
->s
, fd
, (struct sockaddr
*)&sin
, sizeof(sin
),
288 /* --- Finish off initializing the block --- */
290 rq
->state
= IDENT_CONN
;
293 /* --- Tidy up after lossage --- */
298 rq
->state
= IDENT_DONE
;
304 * Arguments: @ident_request *rq@ = pointer to request block
305 * @sel_state *s@ = I/O multiplexor
306 * @const struct sockaddr_in *local, *remote@ = addresses
307 * @void (*func)(ident_reply *i, void *p)@ = handler function
308 * @void *p@ = argument for handler
312 * Use: Initializes an ident request.
315 void ident(ident_request
*rq
, sel_state
*s
,
316 const struct sockaddr_in
*local
,
317 const struct sockaddr_in
*remote
,
318 void (*func
)(ident_reply */
*i*/
, void */
*p*/
),
321 memcpy(&rq
->local
, local
, sizeof(rq
->local
));
322 memcpy(&rq
->remote
, remote
, sizeof(rq
->remote
));
329 /* --- @ident_socket@ --- *
331 * Arguments: @ident_request *rq@ = pointer to request block
332 * @sel_state *s@ = I/O multiplexor
333 * @int sk@ = connected socket file descriptor
334 * @void (*func)(ident_reply *i, void *p)@ = handler function
335 * @void *p@ = argument for handler
339 * Use: An alternative interface to @ident@. Initializes an ident
340 * request from a connected socket, rather than from an explicit
341 * address. This will call @getsockname@ and @getpeername@ to
342 * find out what the socket is actually connected to, which adds
343 * convenience but wastes time.
346 void ident_socket(ident_request
*rq
, sel_state
*s
, int sk
,
347 void (*func
)(ident_reply */
*i*/
, void */
*p*/
),
351 if ((sinsz
= sizeof(struct sockaddr_in
),
352 getsockname(sk
, (struct sockaddr
*)&rq
->local
, &sinsz
)) ||
353 (sinsz
= sizeof(struct sockaddr_in
),
354 getpeername(sk
, (struct sockaddr
*)&rq
->remote
, &sinsz
))) {
355 rq
->state
= IDENT_DONE
;
366 /*----- That's all, folks -------------------------------------------------*/