1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
24/*	  All Rights Reserved  	*/
25
26/*
27 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
28 * Use is subject to license terms.
29 * Copyright 2014 Gary Mills
30 */
31
32/*
33 * interface( label )
34 *	provide alternate definitions for the I/O functions through global
35 *	interfaces.
36 */
37#include "mt.h"
38#include "uucp.h"
39#include <unistd.h>
40
41#ifdef TLI
42#include <tiuser.h>
43#endif /*  TLI  */
44
45static void	sethup(int);
46static int	restline(void);
47static int	usetup(int, int *, int *);
48static int	uteardown(int, int, int);
49
50static ssize_t	(*Read)() = read,
51	(*Write)() = write;
52static int	(*Ioctl)(int, int, ...) = ioctl,
53	(*Setup)() = usetup;
54
55#ifdef TLI
56static void tfaillog(int fd, const char *s);
57static void show_tlook(int);
58static ssize_t	tread(int, char *, unsigned);
59static ssize_t	twrite(int, char *, unsigned);
60static int tioctl(int, int, ...);
61static int tsetup(int, int *, int *); /* TLI setup without streams module */
62static int tssetup(int, int *, int *); /* TLI setup with streams module */
63static int tteardown(int, int, int); /* TLI teardown, works with either setup */
64#endif /*  TLI  */
65
66/*
67 *	The IN_label in Interface[] imply different caller routines:
68 *	e.g. tlicall().
69 *	If so, the names here and the names in callers.c must match.
70 */
71static struct Interface {
72	const	char	*IN_label;	/* interface name */
73	ssize_t	(*IN_read)();		/* read function */
74	ssize_t	(*IN_write)();		/* write function */
75	int	(*IN_ioctl)(int, int, ...);
76	int	(*IN_setup)();		/* setup function, called before */
77					/* first i/o operation */
78	int	(*IN_teardown)();	/* teardown function, called after */
79					/* last i/o operation */
80} Interface[] = {
81			/* vanilla UNIX */
82		{ "UNIX", read, write, ioctl, usetup, uteardown },
83#ifdef TLI
84			/* AT&T Transport Interface Library WITHOUT streams */
85		{ "TLI", tread, twrite, tioctl, tsetup, tteardown },
86#ifdef TLIS
87			/* AT&T Transport Interface Library WITH streams */
88		{ "TLIS", read, write, tioctl, tssetup, uteardown },
89#endif /*  TLIS  */
90#endif /*  TLI  */
91		{ 0, 0, 0, 0, 0, 0 }
92	};
93
94
95static int
96interface(const char *label)
97{
98	int	i;
99
100	for (i = 0;  Interface[i].IN_label;  ++i) {
101		if (strcmp(Interface[i].IN_label, label) == 0) {
102			Read = Interface[i].IN_read;
103			Write = Interface[i].IN_write;
104			Ioctl = Interface[i].IN_ioctl;
105			Setup = Interface[i].IN_setup;
106			DEBUG(5, "set interface %s\n", label);
107			return (0);
108		}
109	}
110	return (FAIL);
111}
112
113/*
114 *	usetup - vanilla unix setup routine
115 */
116static int
117usetup(int role, int *fdreadp, int *fdwritep)
118{
119	if (role == SLAVE) {
120		*fdreadp = 0;
121		*fdwritep = 1;
122		/* 2 has been re-opened to RMTDEBUG in main() */
123	}
124	return (SUCCESS);
125}
126
127/*
128 *	uteardown - vanilla unix teardown routine
129 */
130static int
131uteardown(int role, int fdread, int fdwrite)
132{
133	char *ttyn;
134
135	if (role == SLAVE) {
136		(void) restline();
137		sethup(0);
138	}
139	if (fdread != -1) {
140		ttyn = ttyname(fdread);
141		if (ttyn != NULL)
142			/* can fail, but who cares? */
143			(void) chmod(ttyn, Dev_mode);
144		(void) close(fdread);
145		(void) close(fdwrite);
146	}
147	return (SUCCESS);
148}
149
150#ifdef TLI
151/*
152 *	tread - tli read routine
153 */
154static ssize_t
155tread(int fd, char *buf, unsigned nbytes)
156{
157	int		rcvflags;
158
159	return ((ssize_t)t_rcv(fd, buf, nbytes, &rcvflags));
160}
161
162/*
163 *	twrite - tli write routine
164 */
165#define	N_CHECK	100
166static ssize_t
167twrite(int fd, char *buf, unsigned nbytes)
168{
169	int			i, ret;
170	static int		n_writ, got_info;
171	static struct t_info	info;
172
173	if (got_info == 0) {
174		if (t_getinfo(fd, &info) != 0) {
175			tfaillog(fd, "twrite: t_getinfo\n");
176			return (FAIL);
177		}
178		got_info = 1;
179	}
180
181	/* on every N_CHECKth call, check that are still in DATAXFER state */
182	if (++n_writ == N_CHECK) {
183		n_writ = 0;
184		if (t_getstate(fd) != T_DATAXFER)
185			return (FAIL);
186	}
187
188	if (info.tsdu <= 0 || nbytes <= info.tsdu)
189		return ((ssize_t)t_snd(fd, buf, nbytes, 0));
190	/* if get here, then there is a limit on transmit size	*/
191	/* (info.tsdu > 0) and buf exceeds it			*/
192	i = ret = 0;
193	while (nbytes >= info.tsdu) {
194		if ((ret = t_snd(fd,  &buf[i], info.tsdu, 0)) != info.tsdu)
195			return ((ssize_t)(ret >= 0 ? (i + ret) : ret));
196		i += info.tsdu;
197		nbytes -= info.tsdu;
198	}
199	if (nbytes != 0) {
200		if ((ret = t_snd(fd,  &buf[i], nbytes, 0)) != nbytes)
201			return ((ssize_t)(ret >= 0 ? (i + ret) : ret));
202		i += nbytes;
203	}
204	return ((ssize_t)i);
205}
206
207/*
208 *	tioctl - stub for tli ioctl routine
209 */
210/* ARGSUSED */
211static int
212tioctl(int fd, int request, ...)
213{
214	return (SUCCESS);
215}
216
217/*
218 *	tsetup - tli setup routine
219 *	note blatant assumption that *fdreadp == *fdwritep == 0
220 */
221static int
222tsetup(int role, int *fdreadp, int *fdwritep)
223{
224	if (role == SLAVE) {
225		*fdreadp = 0;
226		*fdwritep = 1;
227		/* 2 has been re-opened to RMTDEBUG in main() */
228		errno = t_errno = 0;
229		if (t_sync(*fdreadp) == -1 || t_sync(*fdwritep) == -1) {
230			tfaillog(*fdreadp, "tsetup: t_sync\n");
231			return (FAIL);
232		}
233	}
234	return (SUCCESS);
235}
236
237/*
238 *	tteardown - tli shutdown routine
239 */
240/* ARGSUSED */
241static int
242tteardown(int role, int fdread, int fdwrite)
243{
244	(void) t_unbind(fdread);
245	(void) t_close(fdread);
246	return (SUCCESS);
247}
248
249#ifdef TLIS
250/*
251 *	tssetup - tli, with streams module, setup routine
252 *	note blatant assumption that *fdreadp == *fdwritep
253 */
254static int
255tssetup(int role, int *fdreadp, int *fdwritep)
256{
257	if (role == SLAVE) {
258		*fdreadp = 0;
259		*fdwritep = 1;
260		/* 2 has been re-opened to RMTDEBUG in main() */
261		DEBUG(5, "tssetup: SLAVE mode: leaving ok\n%s", "");
262		return (SUCCESS);
263	}
264
265	DEBUG(4, "tssetup: MASTER mode: leaving ok\n%s", "");
266	return (SUCCESS);
267}
268
269/*
270 *	Report why a TLI call failed.
271 */
272static void
273tfaillog(int fd, const char *s)
274{
275	char	fmt[ BUFSIZ ];
276
277	if (0 < t_errno && t_errno < t_nerr) {
278		(void) snprintf(fmt, sizeof (fmt), "%s: %%s\n", s);
279		DEBUG(5, fmt, t_errlist[t_errno]);
280		logent(s, t_errlist[t_errno]);
281		if (t_errno == TSYSERR) {
282			(void) strcpy(fmt, "tlicall: system error: %s\n");
283			DEBUG(5, fmt, strerror(errno));
284		} else if (t_errno == TLOOK) {
285			show_tlook(fd);
286		}
287	} else {
288		(void) snprintf(fmt, sizeof (fmt),
289		    "unknown tli error %d", t_errno);
290		logent(s, fmt);
291		(void) snprintf(fmt, sizeof (fmt),
292		    "%s: unknown tli error %d", s, t_errno);
293		DEBUG(5, fmt, 0);
294		(void) snprintf(fmt, sizeof (fmt), "%s: %%s\n", s);
295		DEBUG(5, fmt, strerror(errno));
296	}
297}
298
299static void
300show_tlook(int fd)
301{
302	int reason;
303	const char *msg;
304
305/*
306 * Find out the current state of the interface.
307 */
308	errno = t_errno = 0;
309	switch (reason = t_getstate(fd)) {
310	case T_UNBND:		msg = (const char *)"T_UNBIND";	break;
311	case T_IDLE:		msg = (const char *)"T_IDLE";	break;
312	case T_OUTCON:		msg = (const char *)"T_OUTCON";	break;
313	case T_INCON:		msg = (const char *)"T_INCON";	break;
314	case T_DATAXFER:	msg = (const char *)"T_DATAXFER"; break;
315	case T_OUTREL:		msg = (const char *)"T_OUTREL";	break;
316	case T_INREL:		msg = (const char *)"T_INREL";	break;
317	default:		msg = NULL;		break;
318	}
319	if (msg == NULL)
320		return;
321	DEBUG(5, "state is %s", msg);
322	switch (reason = t_look(fd)) {
323	case -1:		msg = (const char *)""; break;
324	case 0:			msg = (const char *)"NO ERROR"; break;
325	case T_LISTEN:		msg = (const char *)"T_LISTEN"; break;
326	case T_CONNECT:		msg = (const char *)"T_CONNECT"; break;
327	case T_DATA:		msg = (const char *)"T_DATA";	 break;
328	case T_EXDATA:		msg = (const char *)"T_EXDATA"; break;
329	case T_DISCONNECT:	msg = (const char *)"T_DISCONNECT"; break;
330	case T_ORDREL:		msg = (const char *)"T_ORDREL"; break;
331	case T_UDERR:		msg = (const char *)"T_UDERR"; break;
332	default:		msg = (const char *)"UNKNOWN ERROR"; break;
333	}
334	DEBUG(4, " reason is %s\n", msg);
335
336	if (reason == T_DISCONNECT) {
337		struct t_discon	*dropped;
338		if (((dropped =
339		    /* LINTED pointer cast */
340		    (struct t_discon *)t_alloc(fd, T_DIS, T_ALL)) == 0) ||
341		    (t_rcvdis(fd, dropped) == -1)) {
342			if (dropped)
343				(void) t_free((char *)dropped, T_DIS);
344			return;
345		}
346		DEBUG(5, "disconnect reason #%d\n", dropped->reason);
347		(void) t_free((char *)dropped, T_DIS);
348	}
349}
350#endif /*  TLIS  */
351#endif /*  TLI  */
352