Commit | Line | Data |
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5ebb3437 GC |
1 | #define USER 1 |
2 | #include <stdio.h> | |
3 | #include <sys/pk.p> | |
4 | #include <sys/param.h> | |
5 | #include <sys/pk.h> | |
6 | #include <sys/buf.h> | |
7 | #include <setjmp.h> | |
8 | #include <signal.h> | |
9 | ||
10 | #define PKTIME 10 | |
11 | int Errorrate; | |
12 | int Conbad = 0; | |
13 | int Ntimeout = 0; | |
14 | #define CONBAD 5 | |
15 | #define NTIMEOUT 50 | |
16 | /* | |
17 | * packet driver support routines | |
18 | * | |
19 | */ | |
20 | ||
21 | struct pack *pklines[NPLINES]; | |
22 | ||
23 | /* | |
24 | * start initial synchronization. | |
25 | */ | |
26 | ||
27 | struct pack * | |
28 | pkopen(ifn, ofn) | |
29 | int ifn, ofn; | |
30 | { | |
31 | struct pack *pk; | |
32 | char **bp; | |
33 | int i; | |
34 | ||
35 | if (++pkactive >= NPLINES) | |
36 | return(NULL); | |
37 | if ((pk = (struct pack *) malloc(sizeof (struct pack))) == NULL) | |
38 | return(NULL); | |
39 | pkzero((caddr_t) pk, sizeof (struct pack)); | |
40 | pk->p_ifn = ifn; | |
41 | pk->p_ofn = ofn; | |
42 | pk->p_xsize = pk->p_rsize = PACKSIZE; | |
43 | pk->p_rwindow = pk->p_swindow = WINDOWS; | |
44 | /* allocate input windows */ | |
45 | for (i = 0; i < pk->p_rwindow; i++) { | |
46 | if ((bp = (char **) GETEPACK) == NULL) | |
47 | break; | |
48 | *bp = (char *) pk->p_ipool; | |
49 | pk->p_ipool = bp; | |
50 | } | |
51 | if (i == 0) | |
52 | return(NULL); | |
53 | pk->p_rwindow = i; | |
54 | ||
55 | /* start synchronization */ | |
56 | pk->p_msg = pk->p_rmsg = M_INITA; | |
57 | for (i = 0; i < NPLINES; i++) { | |
58 | if (pklines[i] == NULL) { | |
59 | pklines[i] = pk; | |
60 | break; | |
61 | } | |
62 | } | |
63 | if (i >= NPLINES) | |
64 | return(NULL); | |
65 | pkoutput(pk); | |
66 | ||
67 | while ((pk->p_state & LIVE) == 0) { | |
68 | PKGETPKT(pk); | |
69 | } | |
70 | ||
71 | pkreset(pk); | |
72 | return(pk); | |
73 | } | |
74 | ||
75 | ||
76 | /* | |
77 | * input framing and block checking. | |
78 | * frame layout for most devices is: | |
79 | * | |
80 | * S|K|X|Y|C|Z| ... data ... | | |
81 | * | |
82 | * where S == initial synch byte | |
83 | * K == encoded frame size (indexes pksizes[]) | |
84 | * X, Y == block check bytes | |
85 | * C == control byte | |
86 | * Z == XOR of header (K^X^Y^C) | |
87 | * data == 0 or more data bytes | |
88 | * | |
89 | */ | |
90 | ||
91 | int pksizes[] = { | |
92 | 1, 32, 64, 128, 256, 512, 1024, 2048, 4096, 1 | |
93 | }; | |
94 | ||
95 | #define GETRIES 5 | |
96 | /* | |
97 | * Pseudo-dma byte collection. | |
98 | */ | |
99 | ||
100 | pkgetpack(ipk) | |
101 | struct pack *ipk; | |
102 | { | |
103 | int ret, k, tries; | |
104 | register char *p; | |
105 | struct pack *pk; | |
106 | struct header *h; | |
107 | unsigned short sum; | |
108 | int ifn; | |
109 | char **bp; | |
110 | char hdchk; | |
111 | ||
112 | if (Conbad > CONBAD /* || Ntimeout > NTIMEOUT */) | |
113 | pkfail(); | |
114 | pk = PADDR; | |
115 | ifn = pk->p_ifn; | |
116 | ||
117 | /* find HEADER */ | |
118 | for (tries = 0; tries < GETRIES; ) { | |
119 | p = (caddr_t) &pk->p_ihbuf; | |
120 | if ((ret = pkcget(ifn, p, 1)) < 0) { | |
121 | /* set up retransmit or REJ */ | |
122 | tries++; | |
123 | pk->p_msg |= pk->p_rmsg; | |
124 | if (pk->p_msg == 0) | |
125 | pk->p_msg |= M_RR; | |
126 | if ((pk->p_state & LIVE) == LIVE) | |
127 | pk->p_state |= RXMIT; | |
128 | pkoutput(pk); | |
129 | continue; | |
130 | } | |
131 | if (*p != SYN) | |
132 | continue; | |
133 | p++; | |
134 | ret = pkcget(ifn, p, HDRSIZ - 1); | |
135 | if (ret == -1) | |
136 | continue; | |
137 | break; | |
138 | } | |
139 | if (tries >= GETRIES) { | |
140 | PKDEBUG(4, "tries = %d\n", tries); | |
141 | pkfail(); | |
142 | } | |
143 | ||
144 | h = (struct header * ) &pk->p_ihbuf; | |
145 | p = (caddr_t) h; | |
146 | hdchk = p[1] ^ p[2] ^ p[3] ^ p[4]; | |
147 | p += 2; | |
148 | sum = (unsigned) *p++; | |
149 | sum |= (unsigned) *p << 8; | |
150 | h->sum = sum; | |
151 | PKDEBUG(7, "rec h->cntl %o\n", (unsigned) h->cntl); | |
152 | k = h->ksize; | |
153 | if (hdchk != h->ccntl) { | |
154 | /* bad header */ | |
155 | PKDEBUG(7, "bad header %o,", hdchk); | |
156 | PKDEBUG(7, "h->ccntl %o\n", h->ccntl); | |
157 | Conbad++; | |
158 | return; | |
159 | } | |
160 | if (k == 9) { | |
161 | if (h->sum + h->cntl == CHECK) { | |
162 | pkcntl(h->cntl, pk); | |
163 | Conbad = 0; | |
164 | PKDEBUG(7, "state - %o\n", pk->p_state); | |
165 | } | |
166 | else { | |
167 | /* bad header */ | |
168 | Conbad++; | |
169 | PKDEBUG(7, "bad header %o\n", h->cntl); | |
170 | pk->p_state |= BADFRAME; | |
171 | } | |
172 | return; | |
173 | } | |
174 | if (k && pksizes[k] == pk->p_rsize) { | |
175 | pk->p_rpr = h->cntl & MOD8; | |
176 | pksack(pk); | |
177 | Conbad = 0; | |
178 | bp = pk->p_ipool; | |
179 | pk->p_ipool = (char **) *bp; | |
180 | if (bp == NULL) { | |
181 | PKDEBUG(7, "bp NULL %s\n", ""); | |
182 | return; | |
183 | } | |
184 | } | |
185 | else { | |
186 | Conbad++; | |
187 | return; | |
188 | } | |
189 | ret = pkcget(pk->p_ifn, (char *) bp, pk->p_rsize); | |
190 | PKASSERT(ret != -1, "PKGETPKT CAN't READ %d", ret); | |
191 | pkdata(h->cntl, h->sum, pk, (char *) bp); | |
192 | return; | |
193 | } | |
194 | ||
195 | ||
196 | pkdata(c, sum, pk, bp) | |
197 | char c; | |
198 | short sum; | |
199 | register struct pack *pk; | |
200 | char **bp; | |
201 | { | |
202 | register x; | |
203 | int t; | |
204 | char m; | |
205 | ||
206 | if (pk->p_state & DRAINO || !(pk->p_state & LIVE)) { | |
207 | pk->p_msg |= pk->p_rmsg; | |
208 | pkoutput(pk); | |
209 | goto drop; | |
210 | } | |
211 | t = next[pk->p_pr]; | |
212 | for(x=pk->p_pr; x!=t; x = (x-1)&7) { | |
213 | if (pk->p_is[x] == 0) | |
214 | goto slot; | |
215 | } | |
216 | drop: | |
217 | *bp = (char *)pk->p_ipool; | |
218 | pk->p_ipool = bp; | |
219 | return; | |
220 | ||
221 | slot: | |
222 | m = mask[x]; | |
223 | pk->p_imap |= m; | |
224 | pk->p_is[x] = c; | |
225 | pk->p_isum[x] = sum; | |
226 | pk->p_ib[x] = (char *)bp; | |
227 | return; | |
228 | } | |
229 | ||
230 | ||
231 | ||
232 | /* | |
233 | * setup input transfers | |
234 | */ | |
235 | pkrstart(pk) | |
236 | {} | |
237 | ||
238 | /* | |
239 | * Start transmission on output device associated with pk. | |
240 | * For asynch devices (t_line==1) framing is | |
241 | * imposed. For devices with framing and crc | |
242 | * in the driver (t_line==2) the transfer is | |
243 | * passed on to the driver. | |
244 | */ | |
245 | pkxstart(pk, cntl, x) | |
246 | struct pack *pk; | |
247 | char cntl; | |
248 | register x; | |
249 | { | |
250 | register char *p; | |
251 | int ret; | |
252 | short checkword; | |
253 | char hdchk; | |
254 | ||
255 | p = (caddr_t) &pk->p_ohbuf; | |
256 | *p++ = SYN; | |
257 | if (x < 0) { | |
258 | *p++ = hdchk = 9; | |
259 | checkword = cntl; | |
260 | } | |
261 | else { | |
262 | *p++ = hdchk = pk->p_lpsize; | |
263 | checkword = pk->p_osum[x] ^ (unsigned)cntl; | |
264 | } | |
265 | checkword = CHECK - checkword; | |
266 | *p = checkword; | |
267 | hdchk ^= *p++; | |
268 | *p = checkword>>8; | |
269 | hdchk ^= *p++; | |
270 | *p = cntl; | |
271 | hdchk ^= *p++; | |
272 | *p = hdchk; | |
273 | /* writes */ | |
274 | PKDEBUG(7, "send %o\n", (unsigned) cntl); | |
275 | p = (caddr_t) & pk->p_ohbuf; | |
276 | if (x < 0) { | |
277 | GENERROR(p, HDRSIZ); | |
278 | ret = write(pk->p_ofn, p, HDRSIZ); | |
279 | PKASSERT(ret == HDRSIZ, "PKXSTART ret %d", ret); | |
280 | } | |
281 | else { | |
282 | char buf[PACKSIZE + HDRSIZ], *b; | |
283 | int i; | |
284 | for (i = 0, b = buf; i < HDRSIZ; i++) | |
285 | *b++ = *p++; | |
286 | for (i = 0, p = pk->p_ob[x]; i < pk->p_rsize; i++) | |
287 | *b++ = *p++; | |
288 | GENERROR(buf, pk->p_rsize + HDRSIZ); | |
289 | ret = write(pk->p_ofn, buf, pk->p_rsize + HDRSIZ); | |
290 | PKASSERT(ret == pk->p_rsize + HDRSIZ, | |
291 | "PKXSTART ret %d", ret); | |
292 | } | |
293 | if (pk->p_msg) | |
294 | pkoutput(pk); | |
295 | return; | |
296 | } | |
297 | ||
298 | ||
299 | pkmove(p1, p2, count, flag) | |
300 | char *p1, *p2; | |
301 | int count, flag; | |
302 | { | |
303 | char *s, *d; | |
304 | int i; | |
305 | if (flag == B_WRITE) { | |
306 | s = p2; | |
307 | d = p1; | |
308 | } | |
309 | else { | |
310 | s = p1; | |
311 | d = p2; | |
312 | } | |
313 | for (i = 0; i < count; i++) | |
314 | *d++ = *s++; | |
315 | return; | |
316 | } | |
317 | ||
318 | ||
319 | /*** | |
320 | * pkcget(fn, b, n) get n characters from input | |
321 | * char *b; - buffer for characters | |
322 | * int fn; - file descriptor | |
323 | * int n; - requested number of characters | |
324 | * | |
325 | * return codes: | |
326 | * n - number of characters returned | |
327 | * 0 - end of file | |
328 | */ | |
329 | ||
330 | jmp_buf Getjbuf; | |
331 | cgalarm() { longjmp(Getjbuf, 1); } | |
332 | ||
333 | pkcget(fn, b, n) | |
334 | int fn, n; | |
335 | char *b; | |
336 | { | |
337 | int nchars, ret; | |
338 | ||
339 | if (setjmp(Getjbuf)) { | |
340 | Ntimeout++; | |
341 | PKDEBUG(4, "alarm %d\n", Ntimeout); | |
342 | return(-1); | |
343 | } | |
344 | signal(SIGALRM, cgalarm); | |
345 | ||
346 | for (nchars = 0; nchars < n; nchars += ret) { | |
347 | alarm(PKTIME); | |
348 | ret = read(fn, b, n - nchars); | |
349 | if (ret == 0) { | |
350 | alarm(0); | |
351 | return(-1); | |
352 | } | |
353 | PKASSERT(ret > 0, "PKCGET READ %d", ret); | |
354 | b += ret; | |
355 | } | |
356 | alarm(0); | |
357 | return(0); | |
358 | } | |
359 | ||
360 | ||
361 | generror(p, s) | |
362 | char *p; | |
363 | int s; | |
364 | { | |
365 | int r; | |
366 | if (Errorrate != 0 && (rand() % Errorrate) == 0) { | |
367 | r = rand() % s; | |
368 | fprintf(stderr, "gen err at %o, (%o), ", r, (unsigned) *(p + r)); | |
369 | *(p + r) += 1; | |
370 | } | |
371 | return; | |
372 | } | |
373 | ||
374 |