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
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_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 */