3 * $Id: identify.c,v 1.4 1999/07/27 18:30:53 mdw Exp $
5 * Identifies and logs the client of a connection
7 * (c) 1999 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the `fw' port forwarder.
14 * `fw' is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * `fw' 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 General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with `fw'; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Revision history --------------------------------------------------*
31 * $Log: identify.c,v $
32 * Revision 1.4 1999/07/27 18:30:53 mdw
33 * Various minor portability fixes.
35 * Revision 1.3 1999/07/26 23:26:21 mdw
36 * Minor modifications for new design.
38 * Revision 1.2 1999/07/03 13:56:59 mdw
39 * Log connections to syslog or stderr as appropriate.
41 * Revision 1.1.1.1 1999/07/01 08:56:23 mdw
46 /*----- Header files ------------------------------------------------------*/
56 #include <sys/types.h>
61 #include <sys/socket.h>
62 #include <netinet/in.h>
63 #include <arpa/inet.h>
66 #include <mLib/alloc.h>
67 #include <mLib/conn.h>
68 #include <mLib/dstr.h>
69 #include <mLib/report.h>
71 #include <mLib/selbuf.h>
79 /*----- Magic numbers -----------------------------------------------------*/
81 #define TIMEOUT 15 /* Seconds to wait for answers */
83 /*----- Data structures ---------------------------------------------------*/
85 /* --- Structure to track the progress of an identification --- */
88 id_req q; /* Copy of client's request block */
89 time_t when; /* When the connection occurred */
90 conn c; /* Connection selector */
91 unsigned state; /* Current state of the world */
92 bres_client r; /* Backgd resolver client block */
93 char host[64]; /* Resolved hostname */
94 char user[32]; /* Authenticated client user */
95 sel_timer t; /* Timeout selector */
96 selbuf id; /* Reader for the RFC931 client */
99 #define S_HOST 1u /* Read the hostname from resolver */
100 #define S_USER 2u /* Read the username from RFC931 */
101 #define S_UCONN 4u /* Connected to remote RFC931 */
102 #define S_TIMER 8u /* Timeout has completed */
104 /*----- Main code ---------------------------------------------------------*/
106 /* --- @id_done@ --- *
108 * Arguments: @id *i@ = pointer to identification block
112 * Use: Finishes with an identification block.
115 static void id_done(id *i)
117 /* --- Close down the various dependent bits --- */
119 if (!(i->state & S_HOST))
121 if (!(i->state & S_UCONN))
123 else if (!(i->state & S_USER))
124 selbuf_disable(&i->id);
125 if (!(i->state & S_TIMER))
128 /* --- Report the final result --- */
130 fw_log(i->when, "[%s] %s from %s@%s [%s]",
132 i->user, i->host, inet_ntoa(i->q.rsin.sin_addr));
134 /* --- Dispose of the block --- */
140 /* --- @id_res@ --- *
142 * Arguments: @const char *host@ = name of the resolved host
143 * @void *vp@ = pointer to identification block
147 * Use: Responds to a completed reverse name resolution.
150 static void id_res(const char *host, void *vp)
153 str_sanitize(i->host, host, sizeof(i->host));
155 if (i->state & S_USER)
159 /* --- @id_ident@ --- *
161 * Arguments: @char *p@ = pointer to string read from server
162 * @void *vp@ = pointer to identification block
166 * Use: Responds to a line read from the remote RFC931 server.
169 static void id_ident(char *p, void *vp)
173 /* --- Get rid of the connection --- */
176 selbuf_disable(&i->id);
177 close(i->id.reader.fd);
179 /* --- Read the information from the returned line --- */
183 ident_parse(p, &idbuf);
184 if (idbuf.type == ident_userid)
185 str_sanitize(i->user, idbuf.u.userid.user, sizeof(i->user));
188 /* --- Maybe finish off this identification --- */
190 if (i->state & S_HOST)
194 /* --- @id_conn@ --- *
196 * Arguments: @int fd@ = file descriptor connected
197 * @void *vp@ = pointer to identification block
201 * Use: Responds to a completed connection to the remote RFC931
205 static void id_conn(int fd, void *vp)
210 i->state |= S_USER | S_UCONN;
211 if (i->state & S_HOST)
215 dstr_putf(&d, "%u, %u\n",
216 ntohs(i->q.rsin.sin_port), ntohs(i->q.lsin.sin_port));
217 write(fd, d.buf, d.len);
220 selbuf_init(&i->id, sel, fd, id_ident, i);
224 /* --- @id_timer@ --- *
226 * Arguments: @struct timeval *tv@ = pointer to the current time
227 * @void *vp@ = pointer to identification block
231 * Use: Times an identification job out.
234 static void id_timer(struct timeval *tv, void *vp)
240 /* --- @identify@ --- *
242 * Arguments: @const id_req *q@ = pointer to request block
246 * Use: Starts a background ident lookup and reverse-resolve job
247 * which will, eventually, report a message to the system log.
250 void identify(const id_req *q)
254 /* --- Initialize the block with stuff --- */
256 i = xmalloc(sizeof(*i));
260 str_sanitize(i->host, inet_ntoa(q->rsin.sin_addr), sizeof(i->host));
261 strcpy(i->user, "<ANONYMOUS>");
265 /* --- Set up the connection to the identity server --- */
269 struct sockaddr_in sin;
271 if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
274 memset(&sin, 0, sizeof(sin));
275 sin.sin_family = AF_INET;
276 sin.sin_addr = q->lsin.sin_addr;
278 if (bind(fd, (struct sockaddr *)&sin, sizeof(sin))) {
283 sin.sin_family = AF_INET;
284 sin.sin_addr = q->rsin.sin_addr;
285 sin.sin_port = htons(113);
286 setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
287 conn_init(&i->c, sel, fd,
288 (struct sockaddr *)&sin, sizeof(sin),
294 /* --- Set up the name resolver --- */
296 bres_resolve(&i->r, q->rsin.sin_addr, id_res, i);
298 /* --- Set up the time limiter --- */
302 gettimeofday(&tv, 0);
303 tv.tv_sec += TIMEOUT;
304 sel_addtimer(sel, &i->t, &tv, id_timer, i);
308 /*----- That's all, folks -------------------------------------------------*/