3 * $Id: ident.c,v 1.1 1999/10/04 21:41:58 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 1.1 1999/10/04 21:41:58 mdw
34 * Added ident client from `fw'.
38 /*----- Header files ------------------------------------------------------*/
45 #include <sys/types.h>
48 #include <sys/socket.h>
49 #include <netinet/in.h>
50 #include <arpa/inet.h>
59 /*----- Main code ---------------------------------------------------------*/
63 * Arguments: @char **pp@ = address of string pointer
65 * Returns: Address of next token.
67 * Use: Reads the next token from the result string. Tokens are
68 * terminated by whitespace, or `:' or `,' characters. The
69 * result string has had `\' escapes removed; it's stored in
70 * the same memory as the input string. The actual content
71 * of the delimiter doesn't seem to be interesting, so it
75 static char *next(char **pp)
79 /* --- Deal with reads past the end of the string --- */
84 /* --- Initialize various pointers into the string --- */
88 /* --- Skip past any leading whitespace --- */
90 while (isspace((unsigned char)*p))
93 /* --- Now start work on the string itself --- */
96 if (*p == 0 || *p == ':' || *p == ',' || isspace((unsigned char)*p))
98 else if (*p == '\\') {
108 /* --- Tidy up afterwards --- */
110 while (isspace((unsigned char)*p))
114 else if (*p == ':' || *p == ',')
125 * Arguments: @char *p@ = pointer to input string from identd
126 * @ident_reply *i@ = pointer to output block
130 * Use: Parses a result string from an RFC931 (identd) server.
133 static void parse(char *p, ident_reply *i)
137 /* --- Read the source and destination port numbers --- */
139 i->sport = atoi(next(&p));
140 i->dport = atoi(next(&p));
142 /* --- Find out what sort of a reply this is --- */
145 if (strcmp(q, "USERID") == 0) {
146 i->type = IDENT_USERID;
147 i->u.userid.os = next(&p);
148 i->u.userid.user = next(&p);
149 } else if (strcmp(q, "ERROR") == 0) {
150 i->type = IDENT_ERROR;
151 i->u.error = next(&p);
158 * Arguments: @char *s@ = pointer to string from ident server
159 * @void *p@ = pointer to my request block
163 * Use: Handles a string from an ident server.
166 static void line(char *s, void *p)
168 ident_request *rq = p;
170 rq->state = IDENT_DONE;
171 selbuf_disable(&rq->b);
172 close(rq->b.reader.fd);
182 /* --- @connected@ --- *
184 * Arguments: @int fd@ = file descriptor
185 * @void *p@ = pointer to request block
189 * Use: Handles a connection to a remote ident server.
192 static void connected(int fd, void *p)
194 ident_request *rq = p;
197 /* --- Handle an error during the connect --- */
202 /* --- Initialize the string to send to the remote host --- */
205 dstr_putf(&d, "%u, %u\r\n",
206 ntohs(rq->remote.sin_port), ntohs(rq->local.sin_port));
207 } CATCH switch (exc_type) {
215 /* --- Do the rest of the work --- */
217 if (write(fd, d.buf, d.len) < d.len)
220 rq->state = IDENT_READ;
221 selbuf_init(&rq->b, rq->s, fd, line, rq);
224 /* --- Tidy up after misfortunes --- */
230 rq->state = IDENT_DONE;
234 /* --- @ident_abort@ --- *
236 * Arguments: @ident_request *rq@ = pointer to request block
240 * Use: Cancels an ident request in progress.
243 void ident_abort(ident_request *rq)
250 selbuf_disable(&rq->b);
251 close(rq->b.reader.fd);
258 * Arguments: @ident_request *rq@ = pointer to request block
262 * Use: Starts a connection to the remote ident server.
265 static void go(ident_request *rq)
268 struct sockaddr_in sin;
271 /* --- Create the socket I'll use --- */
273 if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
275 memset(&sin, 0, sizeof(sin));
276 sin.sin_family = AF_INET;
278 sin.sin_addr = rq->local.sin_addr;
279 if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)))
282 /* --- Out-of-band data would confuse us --- */
285 setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
287 /* --- Start a connection to the remote server --- */
289 sin.sin_family = AF_INET;
290 sin.sin_port = htons(113);
291 sin.sin_addr = rq->remote.sin_addr;
292 conn_init(&rq->c, rq->s, fd, (struct sockaddr *)&sin, sizeof(sin),
295 /* --- Finish off initializing the block --- */
297 rq->state = IDENT_CONN;
300 /* --- Tidy up after lossage --- */
305 rq->state = IDENT_DONE;
311 * Arguments: @ident_request *rq@ = pointer to request block
312 * @sel_state *s@ = I/O multiplexor
313 * @const struct sockaddr_in *local, *remote@ = addresses
314 * @void (*func)(ident_reply *i, void *p)@ = handler function
315 * @void *p@ = argument for handler
319 * Use: Initializes an ident request.
322 void ident(ident_request *rq, sel_state *s,
323 const struct sockaddr_in *local,
324 const struct sockaddr_in *remote,
325 void (*func)(ident_reply */*i*/, void */*p*/),
328 memcpy(&rq->local, local, sizeof(rq->local));
329 memcpy(&rq->remote, remote, sizeof(rq->remote));
336 /* --- @ident_socket@ --- *
338 * Arguments: @ident_request *rq@ = pointer to request block
339 * @sel_state *s@ = I/O multiplexor
340 * @int sk@ = connected socket file descriptor
341 * @void (*func)(ident_reply *i, void *p)@ = handler function
342 * @void *p@ = argument for handler
346 * Use: An alternative interface to @ident@. Initializes an ident
347 * request from a connected socket, rather than from an explicit
348 * address. This will call @getsockname@ and @getpeername@ to
349 * find out what the socket is actually connected to, which adds
350 * convenience but wastes time.
353 void ident_socket(ident_request *rq, sel_state *s, int sk,
354 void (*func)(ident_reply */*i*/, void */*p*/),
358 if ((sinsz = sizeof(struct sockaddr_in),
359 getsockname(sk, (struct sockaddr *)&rq->local, &sinsz)) ||
360 (sinsz = sizeof(struct sockaddr_in),
361 getpeername(sk, (struct sockaddr *)&rq->remote, &sinsz))) {
362 rq->state = IDENT_DONE;
373 /*----- That's all, folks -------------------------------------------------*/