3 * $Id: ident.c,v 1.2 2000/06/17 10:38:35 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 1.2 2000/06/17 10:38:35 mdw
34 * Track changes to selbuf interface.
36 * Revision 1.1 1999/10/04 21:41:58 mdw
37 * Added ident client from `fw'.
41 /*----- Header files ------------------------------------------------------*/
48 #include <sys/types.h>
51 #include <sys/socket.h>
52 #include <netinet/in.h>
53 #include <arpa/inet.h>
62 /*----- Main code ---------------------------------------------------------*/
66 * Arguments: @char **pp@ = address of string pointer
68 * Returns: Address of next token.
70 * Use: Reads the next token from the result string. Tokens are
71 * terminated by whitespace, or `:' or `,' characters. The
72 * result string has had `\' escapes removed; it's stored in
73 * the same memory as the input string. The actual content
74 * of the delimiter doesn't seem to be interesting, so it
78 static char *next(char **pp)
82 /* --- Deal with reads past the end of the string --- */
87 /* --- Initialize various pointers into the string --- */
91 /* --- Skip past any leading whitespace --- */
93 while (isspace((unsigned char)*p))
96 /* --- Now start work on the string itself --- */
99 if (*p == 0 || *p == ':' || *p == ',' || isspace((unsigned char)*p))
101 else if (*p == '\\') {
111 /* --- Tidy up afterwards --- */
113 while (isspace((unsigned char)*p))
117 else if (*p == ':' || *p == ',')
128 * Arguments: @char *p@ = pointer to input string from identd
129 * @ident_reply *i@ = pointer to output block
133 * Use: Parses a result string from an RFC931 (identd) server.
136 static void parse(char *p, ident_reply *i)
140 /* --- Read the source and destination port numbers --- */
142 i->sport = atoi(next(&p));
143 i->dport = atoi(next(&p));
145 /* --- Find out what sort of a reply this is --- */
148 if (strcmp(q, "USERID") == 0) {
149 i->type = IDENT_USERID;
150 i->u.userid.os = next(&p);
151 i->u.userid.user = next(&p);
152 } else if (strcmp(q, "ERROR") == 0) {
153 i->type = IDENT_ERROR;
154 i->u.error = next(&p);
161 * Arguments: @char *s@ = pointer to string from ident server
162 * @void *p@ = pointer to my request block
166 * Use: Handles a string from an ident server.
169 static void line(char *s, void *p)
171 ident_request *rq = p;
173 rq->state = IDENT_DONE;
174 close(rq->b.reader.fd);
182 selbuf_destroy(&rq->b);
185 /* --- @connected@ --- *
187 * Arguments: @int fd@ = file descriptor
188 * @void *p@ = pointer to request block
192 * Use: Handles a connection to a remote ident server.
195 static void connected(int fd, void *p)
197 ident_request *rq = p;
200 /* --- Handle an error during the connect --- */
205 /* --- Initialize the string to send to the remote host --- */
208 dstr_putf(&d, "%u, %u\r\n",
209 ntohs(rq->remote.sin_port), ntohs(rq->local.sin_port));
210 } CATCH switch (exc_type) {
218 /* --- Do the rest of the work --- */
220 if (write(fd, d.buf, d.len) < d.len)
223 rq->state = IDENT_READ;
224 selbuf_init(&rq->b, rq->s, fd, line, rq);
227 /* --- Tidy up after misfortunes --- */
233 rq->state = IDENT_DONE;
237 /* --- @ident_abort@ --- *
239 * Arguments: @ident_request *rq@ = pointer to request block
243 * Use: Cancels an ident request in progress.
246 void ident_abort(ident_request *rq)
253 close(rq->b.reader.fd);
254 selbuf_destroy(&rq->b);
261 * Arguments: @ident_request *rq@ = pointer to request block
265 * Use: Starts a connection to the remote ident server.
268 static void go(ident_request *rq)
271 struct sockaddr_in sin;
274 /* --- Create the socket I'll use --- */
276 if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
278 memset(&sin, 0, sizeof(sin));
279 sin.sin_family = AF_INET;
281 sin.sin_addr = rq->local.sin_addr;
282 if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)))
285 /* --- Out-of-band data would confuse us --- */
288 setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
290 /* --- Start a connection to the remote server --- */
292 sin.sin_family = AF_INET;
293 sin.sin_port = htons(113);
294 sin.sin_addr = rq->remote.sin_addr;
295 conn_init(&rq->c, rq->s, fd, (struct sockaddr *)&sin, sizeof(sin),
298 /* --- Finish off initializing the block --- */
300 rq->state = IDENT_CONN;
303 /* --- Tidy up after lossage --- */
308 rq->state = IDENT_DONE;
314 * Arguments: @ident_request *rq@ = pointer to request block
315 * @sel_state *s@ = I/O multiplexor
316 * @const struct sockaddr_in *local, *remote@ = addresses
317 * @void (*func)(ident_reply *i, void *p)@ = handler function
318 * @void *p@ = argument for handler
322 * Use: Initializes an ident request.
325 void ident(ident_request *rq, sel_state *s,
326 const struct sockaddr_in *local,
327 const struct sockaddr_in *remote,
328 void (*func)(ident_reply */*i*/, void */*p*/),
331 memcpy(&rq->local, local, sizeof(rq->local));
332 memcpy(&rq->remote, remote, sizeof(rq->remote));
339 /* --- @ident_socket@ --- *
341 * Arguments: @ident_request *rq@ = pointer to request block
342 * @sel_state *s@ = I/O multiplexor
343 * @int sk@ = connected socket file descriptor
344 * @void (*func)(ident_reply *i, void *p)@ = handler function
345 * @void *p@ = argument for handler
349 * Use: An alternative interface to @ident@. Initializes an ident
350 * request from a connected socket, rather than from an explicit
351 * address. This will call @getsockname@ and @getpeername@ to
352 * find out what the socket is actually connected to, which adds
353 * convenience but wastes time.
356 void ident_socket(ident_request *rq, sel_state *s, int sk,
357 void (*func)(ident_reply */*i*/, void */*p*/),
361 if ((sinsz = sizeof(struct sockaddr_in),
362 getsockname(sk, (struct sockaddr *)&rq->local, &sinsz)) ||
363 (sinsz = sizeof(struct sockaddr_in),
364 getpeername(sk, (struct sockaddr *)&rq->remote, &sinsz))) {
365 rq->state = IDENT_DONE;
376 /*----- That's all, folks -------------------------------------------------*/