3 * $Id: identify.c,v 1.5 1999/10/10 16:45:34 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 1.5 1999/10/10 16:45:34 mdw
33 * Modified to use new mLib resolver and ident client.
35 * Revision 1.4 1999/07/27 18:30:53 mdw
36 * Various minor portability fixes.
38 * Revision 1.3 1999/07/26 23:26:21 mdw
39 * Minor modifications for new design.
41 * Revision 1.2 1999/07/03 13:56:59 mdw
42 * Log connections to syslog or stderr as appropriate.
44 * Revision 1.1.1.1 1999/07/01 08:56:23 mdw
49 /*----- Header files ------------------------------------------------------*/
59 #include <sys/types.h>
64 #include <sys/socket.h>
65 #include <netinet/in.h>
66 #include <arpa/inet.h>
69 #include <mLib/alloc.h>
70 #include <mLib/bres.h>
71 #include <mLib/conn.h>
72 #include <mLib/dstr.h>
73 #include <mLib/ident.h>
74 #include <mLib/report.h>
76 #include <mLib/selbuf.h>
82 /*----- Magic numbers -----------------------------------------------------*/
84 #define TIMEOUT 15 /* Seconds to wait for answers */
86 /*----- Data structures ---------------------------------------------------*/
88 /* --- Structure to track the progress of an identification --- */
91 id_req q
; /* Copy of client's request block */
92 time_t when
; /* When the connection occurred */
93 conn c
; /* Connection selector */
94 unsigned state
; /* Current state of the world */
95 sel_timer t
; /* Timeout selector */
96 bres_client r
; /* Backgd resolver client block */
97 ident_request i
; /* Ident client block */
98 char host
[64]; /* Resolved hostname */
99 char user
[32]; /* Authenticated client user */
102 #define S_HOST 1u /* Read the hostname from resolver */
103 #define S_USER 2u /* Read the username from RFC931 */
104 #define S_TIMER 4u /* Timeout has completed */
106 /*----- Main code ---------------------------------------------------------*/
108 /* --- @id_done@ --- *
110 * Arguments: @id *i@ = pointer to identification block
114 * Use: Finishes with an identification block.
117 static void id_done(id
*i
)
119 /* --- Close down the various dependent bits --- */
121 if (!(i
->state
& S_HOST
))
123 if (!(i
->state
& S_USER
))
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: @struct hostent *h@ = 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(struct hostent
*h
, void *vp
)
154 str_sanitize(i
->host
, h
->h_name
, sizeof(i
->host
));
156 if (i
->state
& S_USER
)
160 /* --- @id_ident@ --- *
162 * Arguments: @ident_reply *i@ = pointer to string read from server
163 * @void *vp@ = pointer to identification block
167 * Use: Responds to a line read from the remote RFC931 server.
170 static void id_ident(ident_reply
*ir
, void *vp
)
174 /* --- Read the information from the client --- */
176 if (ir
&& ir
->type
== IDENT_USERID
)
177 str_sanitize(i
->user
, ir
->u
.userid
.user
, sizeof(i
->user
));
179 /* --- Maybe finish off this identification --- */
182 if (i
->state
& S_HOST
)
186 /* --- @id_timer@ --- *
188 * Arguments: @struct timeval *tv@ = pointer to the current time
189 * @void *vp@ = pointer to identification block
193 * Use: Times an identification job out.
196 static void id_timer(struct timeval
*tv
, void *vp
)
202 /* --- @identify@ --- *
204 * Arguments: @const id_req *q@ = pointer to request block
208 * Use: Starts a background ident lookup and reverse-resolve job
209 * which will, eventually, report a message to the system log.
212 void identify(const id_req
*q
)
216 /* --- Initialize the block with stuff --- */
218 i
= xmalloc(sizeof(*i
));
222 str_sanitize(i
->host
, inet_ntoa(q
->rsin
.sin_addr
), sizeof(i
->host
));
223 strcpy(i
->user
, "<ANONYMOUS>");
227 /* --- Set up the connection to the identity server --- */
229 ident(&i
->i
, sel
, &q
->lsin
, &q
->rsin
, id_ident
, i
);
231 /* --- Set up the name resolver --- */
233 bres_byaddr(&i
->r
, q
->rsin
.sin_addr
, id_res
, i
);
235 /* --- Set up the time limiter --- */
239 gettimeofday(&tv
, 0);
240 tv
.tv_sec
+= TIMEOUT
;
241 sel_addtimer(sel
, &i
->t
, &tv
, id_timer
, i
);
245 /*----- That's all, folks -------------------------------------------------*/