3 * $Id: ident.c,v 1.3 2000/10/08 11:17:45 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 1.3 2000/10/08 11:17:45 mdw
34 * (ident_socket): change sizes to be @size_t@.
36 * Revision 1.2 2000/06/17 10:38:35 mdw
37 * Track changes to selbuf interface.
39 * Revision 1.1 1999/10/04 21:41:58 mdw
40 * Added ident client from `fw'.
44 /*----- Header files ------------------------------------------------------*/
51 #include <sys/types.h>
54 #include <sys/socket.h>
55 #include <netinet/in.h>
56 #include <arpa/inet.h>
65 /*----- Main code ---------------------------------------------------------*/
69 * Arguments: @char **pp@ = address of string pointer
71 * Returns: Address of next token.
73 * Use: Reads the next token from the result string. Tokens are
74 * terminated by whitespace, or `:' or `,' characters. The
75 * result string has had `\' escapes removed; it's stored in
76 * the same memory as the input string. The actual content
77 * of the delimiter doesn't seem to be interesting, so it
81 static char *next(char **pp)
85 /* --- Deal with reads past the end of the string --- */
90 /* --- Initialize various pointers into the string --- */
94 /* --- Skip past any leading whitespace --- */
96 while (isspace((unsigned char)*p))
99 /* --- Now start work on the string itself --- */
102 if (*p == 0 || *p == ':' || *p == ',' || isspace((unsigned char)*p))
104 else if (*p == '\\') {
114 /* --- Tidy up afterwards --- */
116 while (isspace((unsigned char)*p))
120 else if (*p == ':' || *p == ',')
131 * Arguments: @char *p@ = pointer to input string from identd
132 * @ident_reply *i@ = pointer to output block
136 * Use: Parses a result string from an RFC931 (identd) server.
139 static void parse(char *p, ident_reply *i)
143 /* --- Read the source and destination port numbers --- */
145 i->sport = atoi(next(&p));
146 i->dport = atoi(next(&p));
148 /* --- Find out what sort of a reply this is --- */
151 if (strcmp(q, "USERID") == 0) {
152 i->type = IDENT_USERID;
153 i->u.userid.os = next(&p);
154 i->u.userid.user = next(&p);
155 } else if (strcmp(q, "ERROR") == 0) {
156 i->type = IDENT_ERROR;
157 i->u.error = next(&p);
164 * Arguments: @char *s@ = pointer to string from ident server
165 * @void *p@ = pointer to my request block
169 * Use: Handles a string from an ident server.
172 static void line(char *s, void *p)
174 ident_request *rq = p;
176 rq->state = IDENT_DONE;
177 close(rq->b.reader.fd);
185 selbuf_destroy(&rq->b);
188 /* --- @connected@ --- *
190 * Arguments: @int fd@ = file descriptor
191 * @void *p@ = pointer to request block
195 * Use: Handles a connection to a remote ident server.
198 static void connected(int fd, void *p)
200 ident_request *rq = p;
203 /* --- Handle an error during the connect --- */
208 /* --- Initialize the string to send to the remote host --- */
211 dstr_putf(&d, "%u, %u\r\n",
212 ntohs(rq->remote.sin_port), ntohs(rq->local.sin_port));
213 } CATCH switch (exc_type) {
221 /* --- Do the rest of the work --- */
223 if (write(fd, d.buf, d.len) < d.len)
226 rq->state = IDENT_READ;
227 selbuf_init(&rq->b, rq->s, fd, line, rq);
230 /* --- Tidy up after misfortunes --- */
236 rq->state = IDENT_DONE;
240 /* --- @ident_abort@ --- *
242 * Arguments: @ident_request *rq@ = pointer to request block
246 * Use: Cancels an ident request in progress.
249 void ident_abort(ident_request *rq)
256 close(rq->b.reader.fd);
257 selbuf_destroy(&rq->b);
264 * Arguments: @ident_request *rq@ = pointer to request block
268 * Use: Starts a connection to the remote ident server.
271 static void go(ident_request *rq)
274 struct sockaddr_in sin;
277 /* --- Create the socket I'll use --- */
279 if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
281 memset(&sin, 0, sizeof(sin));
282 sin.sin_family = AF_INET;
284 sin.sin_addr = rq->local.sin_addr;
285 if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)))
288 /* --- Out-of-band data would confuse us --- */
291 setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
293 /* --- Start a connection to the remote server --- */
295 sin.sin_family = AF_INET;
296 sin.sin_port = htons(113);
297 sin.sin_addr = rq->remote.sin_addr;
298 conn_init(&rq->c, rq->s, fd, (struct sockaddr *)&sin, sizeof(sin),
301 /* --- Finish off initializing the block --- */
303 rq->state = IDENT_CONN;
306 /* --- Tidy up after lossage --- */
311 rq->state = IDENT_DONE;
317 * Arguments: @ident_request *rq@ = pointer to request block
318 * @sel_state *s@ = I/O multiplexor
319 * @const struct sockaddr_in *local, *remote@ = addresses
320 * @void (*func)(ident_reply *i, void *p)@ = handler function
321 * @void *p@ = argument for handler
325 * Use: Initializes an ident request.
328 void ident(ident_request *rq, sel_state *s,
329 const struct sockaddr_in *local,
330 const struct sockaddr_in *remote,
331 void (*func)(ident_reply */*i*/, void */*p*/),
334 memcpy(&rq->local, local, sizeof(rq->local));
335 memcpy(&rq->remote, remote, sizeof(rq->remote));
342 /* --- @ident_socket@ --- *
344 * Arguments: @ident_request *rq@ = pointer to request block
345 * @sel_state *s@ = I/O multiplexor
346 * @int sk@ = connected socket file descriptor
347 * @void (*func)(ident_reply *i, void *p)@ = handler function
348 * @void *p@ = argument for handler
352 * Use: An alternative interface to @ident@. Initializes an ident
353 * request from a connected socket, rather than from an explicit
354 * address. This will call @getsockname@ and @getpeername@ to
355 * find out what the socket is actually connected to, which adds
356 * convenience but wastes time.
359 void ident_socket(ident_request *rq, sel_state *s, int sk,
360 void (*func)(ident_reply */*i*/, void */*p*/),
364 if ((sinsz = sizeof(struct sockaddr_in),
365 getsockname(sk, (struct sockaddr *)&rq->local, &sinsz)) ||
366 (sinsz = sizeof(struct sockaddr_in),
367 getpeername(sk, (struct sockaddr *)&rq->remote, &sinsz))) {
368 rq->state = IDENT_DONE;
379 /*----- That's all, folks -------------------------------------------------*/