3 * $Id: identify.c,v 1.2 1999/07/03 13:56:59 mdw Exp $
5 * Identifies and logs the client of a connection
7 * (c) 1999 Mark Wooding
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 1.2 1999/07/03 13:56:59 mdw
33 * Log connections to syslog or stderr as appropriate.
35 * Revision 1.1.1.1 1999/07/01 08:56:23 mdw
40 /*----- Header files ------------------------------------------------------*/
50 #include <sys/types.h>
55 #include <sys/socket.h>
56 #include <netinet/in.h>
57 #include <arpa/inet.h>
60 #include <mLib/alloc.h>
61 #include <mLib/conn.h>
62 #include <mLib/dstr.h>
63 #include <mLib/report.h>
65 #include <mLib/selbuf.h>
73 /*----- Magic numbers -----------------------------------------------------*/
75 #define TIMEOUT 15 /* Seconds to wait for answers */
77 /*----- Data structures ---------------------------------------------------*/
79 /* --- Structure to track the progress of an identification --- */
82 id_req q; /* Copy of client's request block */
83 void (*func)(void */*p*/); /* Function to call when done */
84 void *p; /* Argument to pass to function */
85 time_t when; /* When the connection occurred */
86 conn c; /* Connection selector */
87 unsigned state; /* Current state of the world */
88 bres_client r; /* Backgd resolver client block */
89 char host[64]; /* Resolved hostname */
90 char user[32]; /* Authenticated client user */
91 sel_timer t; /* Timeout selector */
92 selbuf id; /* Reader for the RFC931 client */
95 #define S_HOST 1u /* Read the hostname from resolver */
96 #define S_USER 2u /* Read the username from RFC931 */
97 #define S_UCONN 4u /* Connected to remote RFC931 */
98 #define S_TIMER 8u /* Timeout has completed */
100 /*----- Main code ---------------------------------------------------------*/
102 /* --- @id_done@ --- *
104 * Arguments: @id *i@ = pointer to identification block
108 * Use: Finishes with an identification block.
111 static void id_done(id *i)
116 /* --- Close down the various dependent bits --- */
118 if (!(i->state & S_HOST))
120 if (!(i->state & S_UCONN))
122 else if (!(i->state & S_USER))
123 selbuf_disable(&i->id);
124 if (!(i->state & S_TIMER))
127 /* --- Report the final result --- */
129 tm = localtime(&i->when);
130 strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm);
131 if (flags & FW_SYSLOG) {
132 syslog(LOG_NOTICE, "%s %s %s from %s@%s [%s]\n",
133 buf, i->q.desc, i->q.act,
134 i->user, i->host, inet_ntoa(i->q.rsin.sin_addr));
136 fprintf(stderr, "%s %s %s from %s@%s [%s]\n",
137 buf, i->q.desc, i->q.act,
138 i->user, i->host, inet_ntoa(i->q.rsin.sin_addr));
141 /* --- Dispose of the block --- */
147 /* --- @id_res@ --- *
149 * Arguments: @const char *host@ = name of the resolved host
150 * @void *vp@ = pointer to identification block
154 * Use: Responds to a completed reverse name resolution.
157 static void id_res(const char *host, void *vp)
160 str_sanitize(i->host, host, sizeof(i->host));
162 if (i->state & S_USER)
166 /* --- @id_ident@ --- *
168 * Arguments: @char *p@ = 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(char *p, void *vp)
180 /* --- Get rid of the connection --- */
183 selbuf_disable(&i->id);
184 close(i->id.reader.fd);
186 /* --- Read the information from the returned line --- */
190 ident_parse(p, &idbuf);
191 if (idbuf.type == ident_userid)
192 str_sanitize(i->user, idbuf.u.userid.user, sizeof(i->user));
195 /* --- Maybe finish off this identification --- */
197 if (i->state & S_HOST)
201 /* --- @id_conn@ --- *
203 * Arguments: @int fd@ = file descriptor connected
204 * @void *vp@ = pointer to identification block
208 * Use: Responds to a completed connection to the remote RFC931
212 static void id_conn(int fd, void *vp)
217 i->state |= S_USER | S_UCONN;
218 if (i->state & S_HOST)
222 dstr_putf(&d, "%u, %u\n",
223 ntohs(i->q.rsin.sin_port), ntohs(i->q.lsin.sin_port));
224 write(fd, d.buf, d.len);
227 selbuf_init(&i->id, sel, fd, id_ident, i);
231 /* --- @id_timer@ --- *
233 * Arguments: @struct timeval *tv@ = pointer to the current time
234 * @void *vp@ = pointer to identification block
238 * Use: Times an identification job out.
241 static void id_timer(struct timeval *tv, void *vp)
247 /* --- @identify@ --- *
249 * Arguments: @const id_req *q@ = pointer to request block
250 * @void (*func)(void *p)@ = function to call when done
251 * @void *p@ = argument to pass to function
255 * Use: Starts a background ident lookup and reverse-resolve job
256 * which will, eventually, report a message to the system log.
259 void identify(const id_req *q,
260 void (*func)(void */*p*/), void *p)
264 /* --- Initialize the block with stuff --- */
266 i = xmalloc(sizeof(*i));
271 str_sanitize(i->host, inet_ntoa(q->rsin.sin_addr), sizeof(i->host));
272 strcpy(i->user, "<ANONYMOUS>");
276 /* --- Set up the connection to the identity server --- */
280 struct sockaddr_in sin;
282 if ((fd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
285 sin.sin_family = AF_INET;
286 sin.sin_addr = q->lsin.sin_addr;
288 if (bind(fd, (struct sockaddr *)&sin, sizeof(sin))) {
292 sin.sin_family = AF_INET;
293 sin.sin_addr = q->rsin.sin_addr;
294 sin.sin_port = htons(113);
295 conn_init(&i->c, sel, fd,
296 (struct sockaddr *)&sin, sizeof(sin),
302 /* --- Set up the name resolver --- */
304 bres_resolve(&i->r, q->rsin.sin_addr, id_res, i);
306 /* --- Set up the time limiter --- */
310 gettimeofday(&tv, 0);
311 tv.tv_sec += TIMEOUT;
312 sel_addtimer(sel, &i->t, &tv, id_timer, i);
316 /*----- That's all, folks -------------------------------------------------*/