xref: /titanic_41/usr/src/lib/libnsl/dial/interface.c (revision ebd1706e95186ddae1d4c0d63c47544cf33832ee)
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 2005 Sun Microsystems, Inc.  All rights reserved.
28  * Use is subject to license terms.
29  */
30 
31 #pragma ident	"%Z%%M%	%I%	%E% SMI"
32 
33 /*
34  * interface( label )
35  *	provide alternate definitions for the I/O functions through global
36  *	interfaces.
37  */
38 #include	"uucp.h"
39 #include	<unistd.h>
40 
41 #ifdef TLI
42 #include	<tiuser.h>
43 #endif /*  TLI  */
44 
45 static void	sethup(int);
46 static int	restline(void);
47 static int	usetup(int, int *, int *);
48 static int	uteardown(int, int, int);
49 
50 static ssize_t	(*Read)() = read,
51 	(*Write)() = write;
52 static int	(*Ioctl)(int, int, ...) = ioctl,
53 	(*Setup)() = usetup;
54 
55 #ifdef TLI
56 static void tfaillog(int fd, const char *s);
57 static void show_tlook(int);
58 static ssize_t	tread(int, char *, unsigned);
59 static ssize_t	twrite(int, char *, unsigned);
60 static int tioctl(int, int, ...);
61 static int tsetup(int, int *, int *); /* TLI setup without streams module */
62 static int tssetup(int, int *, int *); /* TLI setup with streams module */
63 static 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  */
71 static 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 
95 static int
96 interface(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  */
116 static int
117 usetup(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  */
130 static int
131 uteardown(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  */
154 static ssize_t
155 tread(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
166 static ssize_t
167 twrite(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, NULL));
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, NULL)) != 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, NULL)) != 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 */
211 static int
212 tioctl(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  */
221 static int
222 tsetup(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 */
241 static int
242 tteardown(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  */
254 static int
255 tssetup(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  */
272 static void
273 tfaillog(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 
299 static void
300 show_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_ERROR:		msg = (const char *)"T_ERROR"; break;
332 	case T_UDERR:		msg = (const char *)"T_UDERR"; break;
333 	default:		msg = (const char *)"UNKNOWN ERROR"; break;
334 	}
335 	DEBUG(4, " reason is %s\n", msg);
336 
337 	if (reason == T_DISCONNECT) {
338 		struct t_discon	*dropped;
339 		if (((dropped =
340 			/* LINTED pointer cast */
341 			(struct t_discon *)t_alloc(fd, T_DIS, T_ALL)) == 0) ||
342 			(t_rcvdis(fd, dropped) == -1)) {
343 			if (dropped)
344 				(void) t_free((char *)dropped, T_DIS);
345 			return;
346 		}
347 		DEBUG(5, "disconnect reason #%d\n", dropped->reason);
348 		(void) t_free((char *)dropped, T_DIS);
349 	}
350 }
351 #endif /*  TLIS  */
352 #endif /*  TLI  */
353