File: tli-sequent.c

package info (click to toggle)
tcp-wrappers 7.6.q-31
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 1,828 kB
  • sloc: ansic: 17,852; makefile: 2,308; sh: 39
file content (193 lines) | stat: -rw-r--r-- 4,971 bytes parent folder | download | duplicates (16)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
 /*
  * Warning - this relies heavily on the TLI implementation in PTX 2.X and will
  * probably not work under PTX 4.
  * 
  * Author: Tim Wright, Sequent Computer Systems Ltd., UK.
  * 
  * Modified slightly to conform to the new internal interfaces - Wietse
  */

#ifndef lint
static char sccsid[] = "@(#) tli-sequent.c 1.1 94/12/28 17:42:51";
#endif

#ifdef TLI_SEQUENT

/* System libraries. */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/tiuser.h>
#include <sys/stream.h>
#include <sys/stropts.h>
#include <sys/tihdr.h>
#include <sys/timod.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <syslog.h>
#include <errno.h>
#include <string.h>

extern int errno;
extern char *sys_errlist[];
extern int sys_nerr;
extern int t_errno;
extern char *t_errlist[];
extern int t_nerr;

/* Local stuff. */

#include "tcpd.h"
#include "tli-sequent.h"

/* Forward declarations. */

static char *tli_error();
static void tli_sink();

/* tli_host - determine endpoint info */

int     tli_host(request)
struct request_info *request;
{
    static struct sockaddr_in client;
    static struct sockaddr_in server;
    struct _ti_user *tli_state_ptr;
    union T_primitives *TSI_prim_ptr;
    struct strpeek peek;
    int     len;

    /*
     * Use DNS and socket routines for name and address conversions.
     */

    sock_methods(request);

    /*
     * Find out the client address using getpeerinaddr(). This call is the
     * TLI equivalent to getpeername() under Dynix/ptx.
     */

    len = sizeof(client);
    t_sync(request->fd);
    if (getpeerinaddr(request->fd, &client, len) < 0) {
	tcpd_warn("can't get client address: %s", tli_error());
	return;
    }
    request->client->sin = &client;

    /* Call TLI utility routine to get information on endpoint */
    if ((tli_state_ptr = _t_checkfd(request->fd)) == NULL)
	return;

    if (tli_state_ptr->ti_servtype == T_CLTS) {
	/* UDP - may need to get address the hard way */
	if (client.sin_addr.s_addr == 0) {
	    /* The UDP endpoint is not connected so we didn't get the */
	    /* remote address - get it the hard way ! */

	    /* Look at the control part of the top message on the stream */
	    /* we don't want to remove it from the stream so we use I_PEEK */
	    peek.ctlbuf.maxlen = tli_state_ptr->ti_ctlsize;
	    peek.ctlbuf.len = 0;
	    peek.ctlbuf.buf = tli_state_ptr->ti_ctlbuf;
	    /* Don't even look at the data */
	    peek.databuf.maxlen = -1;
	    peek.databuf.len = 0;
	    peek.databuf.buf = 0;
	    peek.flags = 0;

	    switch (ioctl(request->fd, I_PEEK, &peek)) {
	    case -1:
		tcpd_warn("can't peek at endpoint: %s", tli_error());
		return;
	    case 0:
		/* No control part - we're hosed */
		tcpd_warn("can't get UDP info: %s", tli_error());
		return;
	    default:
		/* FALL THROUGH */
		;
	    }
	    /* Can we even check the PRIM_type ? */
	    if (peek.ctlbuf.len < sizeof(long)) {
		tcpd_warn("UDP control info garbage");
		return;
	    }
	    TSI_prim_ptr = (union T_primitives *) peek.ctlbuf.buf;
	    if (TSI_prim_ptr->type != T_UNITDATA_IND) {
		tcpd_warn("wrong type for UDP control info");
		return;
	    }
	    /* Validate returned unitdata indication packet */
	    if ((peek.ctlbuf.len < sizeof(struct T_unitdata_ind)) ||
		((TSI_prim_ptr->unitdata_ind.OPT_length != 0) &&
		 (peek.ctlbuf.len <
		  TSI_prim_ptr->unitdata_ind.OPT_length +
		  TSI_prim_ptr->unitdata_ind.OPT_offset))) {
		tcpd_warn("UDP control info garbaged");
		return;
	    }
	    /* Extract the address */
	    memcpy(&client,
		   peek.ctlbuf.buf + TSI_prim_ptr->unitdata_ind.SRC_offset,
		   TSI_prim_ptr->unitdata_ind.SRC_length);
	}
	request->sink = tli_sink;
    }
    if (getmyinaddr(request->fd, &server, len) < 0)
	tcpd_warn("can't get local address: %s", tli_error());
    else
	request->server->sin = &server;
}

/* tli_error - convert tli error number to text */

static char *tli_error()
{
    static char buf[40];

    if (t_errno != TSYSERR) {
	if (t_errno < 0 || t_errno >= t_nerr) {
	    sprintf(buf, "Unknown TLI error %d", t_errno);
	    return (buf);
	} else {
	    return (t_errlist[t_errno]);
	}
    } else {
	if (errno < 0 || errno >= sys_nerr) {
	    sprintf(buf, "Unknown UNIX error %d", errno);
	    return (buf);
	} else {
	    return (sys_errlist[errno]);
	}
    }
}

/* tli_sink - absorb unreceived datagram */

static void tli_sink(fd)
int     fd;
{
    struct t_unitdata *unit;
    int     flags;

    /*
     * Something went wrong. Absorb the datagram to keep inetd from looping.
     * Allocate storage for address, control and data. If that fails, sleep
     * for a couple of seconds in an attempt to keep inetd from looping too
     * fast.
     */

    if ((unit = (struct t_unitdata *) t_alloc(fd, T_UNITDATA, T_ALL)) == 0) {
	tcpd_warn("t_alloc: %s", tli_error());
	sleep(5);
    } else {
	(void) t_rcvudata(fd, unit, &flags);
	t_free((void *) unit, T_UNITDATA);
    }
}

#endif /* TLI_SEQUENT */