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>
49 /*----- Main code ---------------------------------------------------------*/
53 * Arguments: @char **pp@ = address of string pointer
55 * Returns: Address of next token.
57 * Use: Reads the next token from the result string. Tokens are
58 * terminated by whitespace, or `:' or `,' characters. The
59 * result string has had `\' escapes removed; it's stored in
60 * the same memory as the input string. The actual content
61 * of the delimiter doesn't seem to be interesting, so it
65 static char *next(char **pp
)
69 /* --- Deal with reads past the end of the string --- */
74 /* --- Initialize various pointers into the string --- */
78 /* --- Skip past any leading whitespace --- */
80 while (isspace((unsigned char)*p
))
83 /* --- Now start work on the string itself --- */
86 if (*p
== 0 || *p
== ':' || *p
== ',' || isspace((unsigned char)*p
))
88 else if (*p
== '\\') {
98 /* --- Tidy up afterwards --- */
100 while (isspace((unsigned char)*p
))
104 else if (*p
== ':' || *p
== ',')
115 * Arguments: @char *p@ = pointer to input string from identd
116 * @ident_reply *i@ = pointer to output block
120 * Use: Parses a result string from an RFC931 (identd) server.
123 static void parse(char *p
, ident_reply
*i
)
127 /* --- Read the source and destination port numbers --- */
129 i
->sport
= atoi(next(&p
));
130 i
->dport
= atoi(next(&p
));
132 /* --- Find out what sort of a reply this is --- */
135 if (strcmp(q
, "USERID") == 0) {
136 i
->type
= IDENT_USERID
;
137 i
->u
.userid
.os
= next(&p
);
138 i
->u
.userid
.user
= next(&p
);
139 } else if (strcmp(q
, "ERROR") == 0) {
140 i
->type
= IDENT_ERROR
;
141 i
->u
.error
= next(&p
);
148 * Arguments: @char *s@ = pointer to string from ident server
149 * @size_t len@ = length of the line
150 * @void *p@ = pointer to my request block
154 * Use: Handles a string from an ident server.
157 static void line(char *s
, size_t len
, void *p
)
159 ident_request
*rq
= p
;
161 rq
->state
= IDENT_DONE
;
162 close(rq
->b
.reader
.fd
);
170 selbuf_destroy(&rq
->b
);
173 /* --- @connected@ --- *
175 * Arguments: @int fd@ = file descriptor
176 * @void *p@ = pointer to request block
180 * Use: Handles a connection to a remote ident server.
183 static void connected(int fd
, void *p
)
185 ident_request
*rq
= p
;
188 /* --- Handle an error during the connect --- */
193 /* --- Initialize the string to send to the remote host --- */
196 dstr_putf(&d
, "%u, %u\r\n",
197 ntohs(rq
->remote
.sin_port
), ntohs(rq
->local
.sin_port
));
198 } CATCH
switch (exc_type
) {
206 /* --- Do the rest of the work --- */
208 if (write(fd
, d
.buf
, d
.len
) < d
.len
)
211 rq
->state
= IDENT_READ
;
212 selbuf_init(&rq
->b
, rq
->s
, fd
, line
, rq
);
215 /* --- Tidy up after misfortunes --- */
221 rq
->state
= IDENT_DONE
;
225 /* --- @ident_abort@ --- *
227 * Arguments: @ident_request *rq@ = pointer to request block
231 * Use: Cancels an ident request in progress.
234 void ident_abort(ident_request
*rq
)
241 close(rq
->b
.reader
.fd
);
242 selbuf_destroy(&rq
->b
);
249 * Arguments: @ident_request *rq@ = pointer to request block
253 * Use: Starts a connection to the remote ident server.
256 static void go(ident_request
*rq
)
259 struct sockaddr_in sin
;
262 /* --- Create the socket I'll use --- */
264 if ((fd
= socket(PF_INET
, SOCK_STREAM
, 0)) < 0)
266 memset(&sin
, 0, sizeof(sin
));
267 sin
.sin_family
= AF_INET
;
269 sin
.sin_addr
= rq
->local
.sin_addr
;
270 if (bind(fd
, (struct sockaddr
*)&sin
, sizeof(sin
)))
273 /* --- Out-of-band data would confuse us --- */
276 setsockopt(fd
, SOL_SOCKET
, SO_OOBINLINE
, &opt
, sizeof(opt
));
278 /* --- Start a connection to the remote server --- */
280 sin
.sin_family
= AF_INET
;
281 sin
.sin_port
= htons(113);
282 sin
.sin_addr
= rq
->remote
.sin_addr
;
283 if (conn_init(&rq
->c
, rq
->s
, fd
, (struct sockaddr
*)&sin
, sizeof(sin
),
287 /* --- Finish off initializing the block --- */
289 rq
->state
= IDENT_CONN
;
292 /* --- Tidy up after lossage --- */
297 rq
->state
= IDENT_DONE
;
303 * Arguments: @ident_request *rq@ = pointer to request block
304 * @sel_state *s@ = I/O multiplexor
305 * @const struct sockaddr_in *local, *remote@ = addresses
306 * @void (*func)(ident_reply *i, void *p)@ = handler function
307 * @void *p@ = argument for handler
311 * Use: Initializes an ident request.
314 void ident(ident_request
*rq
, sel_state
*s
,
315 const struct sockaddr_in
*local
,
316 const struct sockaddr_in
*remote
,
317 void (*func
)(ident_reply */
*i*/
, void */
*p*/
),
320 memcpy(&rq
->local
, local
, sizeof(rq
->local
));
321 memcpy(&rq
->remote
, remote
, sizeof(rq
->remote
));
328 /* --- @ident_socket@ --- *
330 * Arguments: @ident_request *rq@ = pointer to request block
331 * @sel_state *s@ = I/O multiplexor
332 * @int sk@ = connected socket file descriptor
333 * @void (*func)(ident_reply *i, void *p)@ = handler function
334 * @void *p@ = argument for handler
338 * Use: An alternative interface to @ident@. Initializes an ident
339 * request from a connected socket, rather than from an explicit
340 * address. This will call @getsockname@ and @getpeername@ to
341 * find out what the socket is actually connected to, which adds
342 * convenience but wastes time.
345 void ident_socket(ident_request
*rq
, sel_state
*s
, int sk
,
346 void (*func
)(ident_reply */
*i*/
, void */
*p*/
),
350 if ((sinsz
= sizeof(struct sockaddr_in
),
351 getsockname(sk
, (struct sockaddr
*)&rq
->local
, &sinsz
)) ||
352 (sinsz
= sizeof(struct sockaddr_in
),
353 getpeername(sk
, (struct sockaddr
*)&rq
->remote
, &sinsz
))) {
354 rq
->state
= IDENT_DONE
;
365 /*----- That's all, folks -------------------------------------------------*/