3 * $Id: identify.c,v 1.7 2002/02/22 23:43:32 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 1.7 2002/02/22 23:43:32 mdw
33 * Call @xfree@ rather than @free@.
35 * Revision 1.6 2001/06/22 19:36:49 mdw
36 * Enlarge the identity buffer.
38 * Revision 1.5 1999/10/10 16:45:34 mdw
39 * Modified to use new mLib resolver and ident client.
41 * Revision 1.4 1999/07/27 18:30:53 mdw
42 * Various minor portability fixes.
44 * Revision 1.3 1999/07/26 23:26:21 mdw
45 * Minor modifications for new design.
47 * Revision 1.2 1999/07/03 13:56:59 mdw
48 * Log connections to syslog or stderr as appropriate.
50 * Revision 1.1.1.1 1999/07/01 08:56:23 mdw
55 /*----- Header files ------------------------------------------------------*/
65 #include <sys/types.h>
70 #include <sys/socket.h>
71 #include <netinet/in.h>
72 #include <arpa/inet.h>
75 #include <mLib/alloc.h>
76 #include <mLib/bres.h>
77 #include <mLib/conn.h>
78 #include <mLib/dstr.h>
79 #include <mLib/ident.h>
80 #include <mLib/report.h>
82 #include <mLib/selbuf.h>
88 /*----- Magic numbers -----------------------------------------------------*/
90 #define TIMEOUT 15 /* Seconds to wait for answers */
92 /*----- Data structures ---------------------------------------------------*/
94 /* --- Structure to track the progress of an identification --- */
97 id_req q
; /* Copy of client's request block */
98 time_t when
; /* When the connection occurred */
99 conn c
; /* Connection selector */
100 unsigned state
; /* Current state of the world */
101 sel_timer t
; /* Timeout selector */
102 bres_client r
; /* Backgd resolver client block */
103 ident_request i
; /* Ident client block */
104 char host
[128]; /* Resolved hostname */
105 char user
[64]; /* Authenticated client user */
108 #define S_HOST 1u /* Read the hostname from resolver */
109 #define S_USER 2u /* Read the username from RFC931 */
110 #define S_TIMER 4u /* Timeout has completed */
112 /*----- Main code ---------------------------------------------------------*/
114 /* --- @id_done@ --- *
116 * Arguments: @id *i@ = pointer to identification block
120 * Use: Finishes with an identification block.
123 static void id_done(id
*i
)
125 /* --- Close down the various dependent bits --- */
127 if (!(i
->state
& S_HOST
))
129 if (!(i
->state
& S_USER
))
131 if (!(i
->state
& S_TIMER
))
134 /* --- Report the final result --- */
136 fw_log(i
->when
, "[%s] %s from %s@%s [%s]",
138 i
->user
, i
->host
, inet_ntoa(i
->q
.rsin
.sin_addr
));
140 /* --- Dispose of the block --- */
146 /* --- @id_res@ --- *
148 * Arguments: @struct hostent *h@ = name of the resolved host
149 * @void *vp@ = pointer to identification block
153 * Use: Responds to a completed reverse name resolution.
156 static void id_res(struct hostent
*h
, void *vp
)
160 str_sanitize(i
->host
, h
->h_name
, sizeof(i
->host
));
162 if (i
->state
& S_USER
)
166 /* --- @id_ident@ --- *
168 * Arguments: @ident_reply *i@ = pointer to string read from server
169 * @void *vp@ = pointer to identification block
173 * Use: Responds to a line read from the remote RFC931 server.
176 static void id_ident(ident_reply
*ir
, void *vp
)
180 /* --- Read the information from the client --- */
182 if (ir
&& ir
->type
== IDENT_USERID
)
183 str_sanitize(i
->user
, ir
->u
.userid
.user
, sizeof(i
->user
));
185 /* --- Maybe finish off this identification --- */
188 if (i
->state
& S_HOST
)
192 /* --- @id_timer@ --- *
194 * Arguments: @struct timeval *tv@ = pointer to the current time
195 * @void *vp@ = pointer to identification block
199 * Use: Times an identification job out.
202 static void id_timer(struct timeval
*tv
, void *vp
)
208 /* --- @identify@ --- *
210 * Arguments: @const id_req *q@ = pointer to request block
214 * Use: Starts a background ident lookup and reverse-resolve job
215 * which will, eventually, report a message to the system log.
218 void identify(const id_req
*q
)
222 /* --- Initialize the block with stuff --- */
224 i
= xmalloc(sizeof(*i
));
228 str_sanitize(i
->host
, inet_ntoa(q
->rsin
.sin_addr
), sizeof(i
->host
));
229 strcpy(i
->user
, "<ANONYMOUS>");
233 /* --- Set up the connection to the identity server --- */
235 ident(&i
->i
, sel
, &q
->lsin
, &q
->rsin
, id_ident
, i
);
237 /* --- Set up the name resolver --- */
239 bres_byaddr(&i
->r
, q
->rsin
.sin_addr
, id_res
, i
);
241 /* --- Set up the time limiter --- */
245 gettimeofday(&tv
, 0);
246 tv
.tv_sec
+= TIMEOUT
;
247 sel_addtimer(sel
, &i
->t
, &tv
, id_timer
, i
);
251 /*----- That's all, folks -------------------------------------------------*/