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Date:: Tue Dec 7 18:34:11 2010 UTC
Message:: delete 9P2000.u thanks to Erik Quanstrom R=rsc http://codereview.appspot.com/3469042
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  1 d3df3087 2003-12-06 devnull #include	<u.h>
  2 d3df3087 2003-12-06 devnull #include	<libc.h>
  3 d3df3087 2003-12-06 devnull #include	<fcall.h>
  4 d3df3087 2003-12-06 devnull 
  5 d3df3087 2003-12-06 devnull static
  6 d3df3087 2003-12-06 devnull uchar*
  7 d3df3087 2003-12-06 devnull gstring(uchar *p, uchar *ep, char **s)
  8 d3df3087 2003-12-06 devnull {
  9 d3df3087 2003-12-06 devnull 	uint n;
 10 d3df3087 2003-12-06 devnull 
 11 d3df3087 2003-12-06 devnull 	if(p+BIT16SZ > ep)
 12 d3df3087 2003-12-06 devnull 		return nil;
 13 d3df3087 2003-12-06 devnull 	n = GBIT16(p);
 14 d3df3087 2003-12-06 devnull 	p += BIT16SZ - 1;
 15 d3df3087 2003-12-06 devnull 	if(p+n+1 > ep)
 16 d3df3087 2003-12-06 devnull 		return nil;
 17 d3df3087 2003-12-06 devnull 	/* move it down, on top of count, to make room for '\0' */
 18 d3df3087 2003-12-06 devnull 	memmove(p, p + 1, n);
 19 d3df3087 2003-12-06 devnull 	p[n] = '\0';
 20 d3df3087 2003-12-06 devnull 	*s = (char*)p;
 21 d3df3087 2003-12-06 devnull 	p += n+1;
 22 d3df3087 2003-12-06 devnull 	return p;
 23 d3df3087 2003-12-06 devnull }
 24 d3df3087 2003-12-06 devnull 
 25 d3df3087 2003-12-06 devnull static
 26 d3df3087 2003-12-06 devnull uchar*
 27 d3df3087 2003-12-06 devnull gqid(uchar *p, uchar *ep, Qid *q)
 28 d3df3087 2003-12-06 devnull {
 29 d3df3087 2003-12-06 devnull 	if(p+QIDSZ > ep)
 30 d3df3087 2003-12-06 devnull 		return nil;
 31 d3df3087 2003-12-06 devnull 	q->type = GBIT8(p);
 32 d3df3087 2003-12-06 devnull 	p += BIT8SZ;
 33 d3df3087 2003-12-06 devnull 	q->vers = GBIT32(p);
 34 d3df3087 2003-12-06 devnull 	p += BIT32SZ;
 35 d3df3087 2003-12-06 devnull 	q->path = GBIT64(p);
 36 d3df3087 2003-12-06 devnull 	p += BIT64SZ;
 37 d3df3087 2003-12-06 devnull 	return p;
 38 d3df3087 2003-12-06 devnull }
 39 d3df3087 2003-12-06 devnull 
 40 d3df3087 2003-12-06 devnull /*
 41 d3df3087 2003-12-06 devnull  * no syntactic checks.
 42 d3df3087 2003-12-06 devnull  * three causes for error:
 43 d3df3087 2003-12-06 devnull  *  1. message size field is incorrect
 44 d3df3087 2003-12-06 devnull  *  2. input buffer too short for its own data (counts too long, etc.)
 45 d3df3087 2003-12-06 devnull  *  3. too many names or qids
 46 d3df3087 2003-12-06 devnull  * gqid() and gstring() return nil if they would reach beyond buffer.
 47 d3df3087 2003-12-06 devnull  * main switch statement checks range and also can fall through
 48 d3df3087 2003-12-06 devnull  * to test at end of routine.
 49 d3df3087 2003-12-06 devnull  */
 50 d3df3087 2003-12-06 devnull uint
 51 74dd0321 2010-12-07 rsc convM2S(uchar *ap, uint nap, Fcall *f)
 52 d3df3087 2003-12-06 devnull {
 53 d3df3087 2003-12-06 devnull 	uchar *p, *ep;
 54 d3df3087 2003-12-06 devnull 	uint i, size;
 55 d3df3087 2003-12-06 devnull 
 56 d3df3087 2003-12-06 devnull 	p = ap;
 57 d3df3087 2003-12-06 devnull 	ep = p + nap;
 58 d3df3087 2003-12-06 devnull 
 59 d3df3087 2003-12-06 devnull 	if(p+BIT32SZ+BIT8SZ+BIT16SZ > ep)
 60 d3df3087 2003-12-06 devnull 		return 0;
 61 d3df3087 2003-12-06 devnull 	size = GBIT32(p);
 62 d3df3087 2003-12-06 devnull 	p += BIT32SZ;
 63 d3df3087 2003-12-06 devnull 
 64 d3df3087 2003-12-06 devnull 	if(size < BIT32SZ+BIT8SZ+BIT16SZ)
 65 d3df3087 2003-12-06 devnull 		return 0;
 66 d3df3087 2003-12-06 devnull 
 67 d3df3087 2003-12-06 devnull 	f->type = GBIT8(p);
 68 d3df3087 2003-12-06 devnull 	p += BIT8SZ;
 69 d3df3087 2003-12-06 devnull 	f->tag = GBIT16(p);
 70 d3df3087 2003-12-06 devnull 	p += BIT16SZ;
 71 d3df3087 2003-12-06 devnull 
 72 d3df3087 2003-12-06 devnull 	switch(f->type)
 73 d3df3087 2003-12-06 devnull 	{
 74 d3df3087 2003-12-06 devnull 	default:
 75 d3df3087 2003-12-06 devnull 		return 0;
 76 d3df3087 2003-12-06 devnull 
 77 d3df3087 2003-12-06 devnull 	case Tversion:
 78 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
 79 d3df3087 2003-12-06 devnull 			return 0;
 80 d3df3087 2003-12-06 devnull 		f->msize = GBIT32(p);
 81 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
 82 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->version);
 83 d3df3087 2003-12-06 devnull 		break;
 84 d3df3087 2003-12-06 devnull 
 85 d3df3087 2003-12-06 devnull 	case Tflush:
 86 d3df3087 2003-12-06 devnull 		if(p+BIT16SZ > ep)
 87 d3df3087 2003-12-06 devnull 			return 0;
 88 d3df3087 2003-12-06 devnull 		f->oldtag = GBIT16(p);
 89 d3df3087 2003-12-06 devnull 		p += BIT16SZ;
 90 d3df3087 2003-12-06 devnull 		break;
 91 d3df3087 2003-12-06 devnull 
 92 d3df3087 2003-12-06 devnull 	case Tauth:
 93 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
 94 d3df3087 2003-12-06 devnull 			return 0;
 95 d3df3087 2003-12-06 devnull 		f->afid = GBIT32(p);
 96 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
 97 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->uname);
 98 d3df3087 2003-12-06 devnull 		if(p == nil)
 99 d3df3087 2003-12-06 devnull 			break;
100 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->aname);
101 d3df3087 2003-12-06 devnull 		if(p == nil)
102 d3df3087 2003-12-06 devnull 			break;
103 8ff457f5 2009-08-20 tim.newsh 		f->uidnum = NOUID;
104 d3df3087 2003-12-06 devnull 		break;
105 d3df3087 2003-12-06 devnull 
106 d3df3087 2003-12-06 devnull 	case Tattach:
107 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
108 d3df3087 2003-12-06 devnull 			return 0;
109 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
110 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
111 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
112 d3df3087 2003-12-06 devnull 			return 0;
113 d3df3087 2003-12-06 devnull 		f->afid = GBIT32(p);
114 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
115 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->uname);
116 d3df3087 2003-12-06 devnull 		if(p == nil)
117 d3df3087 2003-12-06 devnull 			break;
118 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->aname);
119 d3df3087 2003-12-06 devnull 		if(p == nil)
120 d3df3087 2003-12-06 devnull 			break;
121 8ff457f5 2009-08-20 tim.newsh 		f->uidnum = NOUID;
122 d3df3087 2003-12-06 devnull 		break;
123 d3df3087 2003-12-06 devnull 
124 d3df3087 2003-12-06 devnull 	case Twalk:
125 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT32SZ+BIT16SZ > ep)
126 d3df3087 2003-12-06 devnull 			return 0;
127 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
128 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
129 d3df3087 2003-12-06 devnull 		f->newfid = GBIT32(p);
130 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
131 d3df3087 2003-12-06 devnull 		f->nwname = GBIT16(p);
132 d3df3087 2003-12-06 devnull 		p += BIT16SZ;
133 d3df3087 2003-12-06 devnull 		if(f->nwname > MAXWELEM)
134 d3df3087 2003-12-06 devnull 			return 0;
135 d3df3087 2003-12-06 devnull 		for(i=0; i<f->nwname; i++){
136 d3df3087 2003-12-06 devnull 			p = gstring(p, ep, &f->wname[i]);
137 d3df3087 2003-12-06 devnull 			if(p == nil)
138 d3df3087 2003-12-06 devnull 				break;
139 d3df3087 2003-12-06 devnull 		}
140 d3df3087 2003-12-06 devnull 		break;
141 d3df3087 2003-12-06 devnull 
142 d3df3087 2003-12-06 devnull 	case Topen:
143 32f69c36 2003-12-11 devnull 	case Topenfd:
144 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT8SZ > ep)
145 d3df3087 2003-12-06 devnull 			return 0;
146 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
147 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
148 d3df3087 2003-12-06 devnull 		f->mode = GBIT8(p);
149 d3df3087 2003-12-06 devnull 		p += BIT8SZ;
150 d3df3087 2003-12-06 devnull 		break;
151 d3df3087 2003-12-06 devnull 
152 d3df3087 2003-12-06 devnull 	case Tcreate:
153 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
154 d3df3087 2003-12-06 devnull 			return 0;
155 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
156 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
157 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->name);
158 d3df3087 2003-12-06 devnull 		if(p == nil)
159 d3df3087 2003-12-06 devnull 			break;
160 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT8SZ > ep)
161 d3df3087 2003-12-06 devnull 			return 0;
162 d3df3087 2003-12-06 devnull 		f->perm = GBIT32(p);
163 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
164 d3df3087 2003-12-06 devnull 		f->mode = GBIT8(p);
165 d3df3087 2003-12-06 devnull 		p += BIT8SZ;
166 d3df3087 2003-12-06 devnull 		break;
167 d3df3087 2003-12-06 devnull 
168 d3df3087 2003-12-06 devnull 	case Tread:
169 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT64SZ+BIT32SZ > ep)
170 d3df3087 2003-12-06 devnull 			return 0;
171 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
172 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
173 d3df3087 2003-12-06 devnull 		f->offset = GBIT64(p);
174 d3df3087 2003-12-06 devnull 		p += BIT64SZ;
175 d3df3087 2003-12-06 devnull 		f->count = GBIT32(p);
176 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
177 d3df3087 2003-12-06 devnull 		break;
178 d3df3087 2003-12-06 devnull 
179 d3df3087 2003-12-06 devnull 	case Twrite:
180 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT64SZ+BIT32SZ > ep)
181 d3df3087 2003-12-06 devnull 			return 0;
182 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
183 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
184 d3df3087 2003-12-06 devnull 		f->offset = GBIT64(p);
185 d3df3087 2003-12-06 devnull 		p += BIT64SZ;
186 d3df3087 2003-12-06 devnull 		f->count = GBIT32(p);
187 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
188 d3df3087 2003-12-06 devnull 		if(p+f->count > ep)
189 d3df3087 2003-12-06 devnull 			return 0;
190 d3df3087 2003-12-06 devnull 		f->data = (char*)p;
191 d3df3087 2003-12-06 devnull 		p += f->count;
192 d3df3087 2003-12-06 devnull 		break;
193 d3df3087 2003-12-06 devnull 
194 d3df3087 2003-12-06 devnull 	case Tclunk:
195 d3df3087 2003-12-06 devnull 	case Tremove:
196 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
197 d3df3087 2003-12-06 devnull 			return 0;
198 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
199 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
200 d3df3087 2003-12-06 devnull 		break;
201 d3df3087 2003-12-06 devnull 
202 d3df3087 2003-12-06 devnull 	case Tstat:
203 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
204 d3df3087 2003-12-06 devnull 			return 0;
205 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
206 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
207 d3df3087 2003-12-06 devnull 		break;
208 d3df3087 2003-12-06 devnull 
209 d3df3087 2003-12-06 devnull 	case Twstat:
210 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT16SZ > ep)
211 d3df3087 2003-12-06 devnull 			return 0;
212 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
213 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
214 d3df3087 2003-12-06 devnull 		f->nstat = GBIT16(p);
215 d3df3087 2003-12-06 devnull 		p += BIT16SZ;
216 d3df3087 2003-12-06 devnull 		if(p+f->nstat > ep)
217 d3df3087 2003-12-06 devnull 			return 0;
218 d3df3087 2003-12-06 devnull 		f->stat = p;
219 d3df3087 2003-12-06 devnull 		p += f->nstat;
220 d3df3087 2003-12-06 devnull 		break;
221 d3df3087 2003-12-06 devnull 
222 d3df3087 2003-12-06 devnull /*
223 d3df3087 2003-12-06 devnull  */
224 d3df3087 2003-12-06 devnull 	case Rversion:
225 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
226 d3df3087 2003-12-06 devnull 			return 0;
227 d3df3087 2003-12-06 devnull 		f->msize = GBIT32(p);
228 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
229 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->version);
230 d3df3087 2003-12-06 devnull 		break;
231 d3df3087 2003-12-06 devnull 
232 d3df3087 2003-12-06 devnull 	case Rerror:
233 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->ename);
234 fb941e08 2005-09-13 devnull 		f->errornum = 0;
235 d3df3087 2003-12-06 devnull 		break;
236 d3df3087 2003-12-06 devnull 
237 d3df3087 2003-12-06 devnull 	case Rflush:
238 d3df3087 2003-12-06 devnull 		break;
239 d3df3087 2003-12-06 devnull 
240 d3df3087 2003-12-06 devnull 	case Rauth:
241 d3df3087 2003-12-06 devnull 		p = gqid(p, ep, &f->aqid);
242 d3df3087 2003-12-06 devnull 		if(p == nil)
243 d3df3087 2003-12-06 devnull 			break;
244 d3df3087 2003-12-06 devnull 		break;
245 d3df3087 2003-12-06 devnull 
246 d3df3087 2003-12-06 devnull 	case Rattach:
247 d3df3087 2003-12-06 devnull 		p = gqid(p, ep, &f->qid);
248 d3df3087 2003-12-06 devnull 		if(p == nil)
249 d3df3087 2003-12-06 devnull 			break;
250 d3df3087 2003-12-06 devnull 		break;
251 d3df3087 2003-12-06 devnull 
252 d3df3087 2003-12-06 devnull 	case Rwalk:
253 d3df3087 2003-12-06 devnull 		if(p+BIT16SZ > ep)
254 d3df3087 2003-12-06 devnull 			return 0;
255 d3df3087 2003-12-06 devnull 		f->nwqid = GBIT16(p);
256 d3df3087 2003-12-06 devnull 		p += BIT16SZ;
257 d3df3087 2003-12-06 devnull 		if(f->nwqid > MAXWELEM)
258 d3df3087 2003-12-06 devnull 			return 0;
259 d3df3087 2003-12-06 devnull 		for(i=0; i<f->nwqid; i++){
260 d3df3087 2003-12-06 devnull 			p = gqid(p, ep, &f->wqid[i]);
261 d3df3087 2003-12-06 devnull 			if(p == nil)
262 d3df3087 2003-12-06 devnull 				break;
263 d3df3087 2003-12-06 devnull 		}
264 d3df3087 2003-12-06 devnull 		break;
265 d3df3087 2003-12-06 devnull 
266 d3df3087 2003-12-06 devnull 	case Ropen:
267 32f69c36 2003-12-11 devnull 	case Ropenfd:
268 d3df3087 2003-12-06 devnull 	case Rcreate:
269 d3df3087 2003-12-06 devnull 		p = gqid(p, ep, &f->qid);
270 d3df3087 2003-12-06 devnull 		if(p == nil)
271 d3df3087 2003-12-06 devnull 			break;
272 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
273 d3df3087 2003-12-06 devnull 			return 0;
274 d3df3087 2003-12-06 devnull 		f->iounit = GBIT32(p);
275 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
276 32f69c36 2003-12-11 devnull 		if(f->type == Ropenfd){
277 32f69c36 2003-12-11 devnull 			if(p+BIT32SZ > ep)
278 32f69c36 2003-12-11 devnull 				return 0;
279 32f69c36 2003-12-11 devnull 			f->unixfd = GBIT32(p);
280 32f69c36 2003-12-11 devnull 			p += BIT32SZ;
281 32f69c36 2003-12-11 devnull 		}
282 d3df3087 2003-12-06 devnull 		break;
283 d3df3087 2003-12-06 devnull 
284 d3df3087 2003-12-06 devnull 	case Rread:
285 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
286 d3df3087 2003-12-06 devnull 			return 0;
287 d3df3087 2003-12-06 devnull 		f->count = GBIT32(p);
288 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
289 d3df3087 2003-12-06 devnull 		if(p+f->count > ep)
290 d3df3087 2003-12-06 devnull 			return 0;
291 d3df3087 2003-12-06 devnull 		f->data = (char*)p;
292 d3df3087 2003-12-06 devnull 		p += f->count;
293 d3df3087 2003-12-06 devnull 		break;
294 d3df3087 2003-12-06 devnull 
295 d3df3087 2003-12-06 devnull 	case Rwrite:
296 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
297 d3df3087 2003-12-06 devnull 			return 0;
298 d3df3087 2003-12-06 devnull 		f->count = GBIT32(p);
299 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
300 d3df3087 2003-12-06 devnull 		break;
301 d3df3087 2003-12-06 devnull 
302 d3df3087 2003-12-06 devnull 	case Rclunk:
303 d3df3087 2003-12-06 devnull 	case Rremove:
304 d3df3087 2003-12-06 devnull 		break;
305 d3df3087 2003-12-06 devnull 
306 d3df3087 2003-12-06 devnull 	case Rstat:
307 d3df3087 2003-12-06 devnull 		if(p+BIT16SZ > ep)
308 d3df3087 2003-12-06 devnull 			return 0;
309 d3df3087 2003-12-06 devnull 		f->nstat = GBIT16(p);
310 d3df3087 2003-12-06 devnull 		p += BIT16SZ;
311 d3df3087 2003-12-06 devnull 		if(p+f->nstat > ep)
312 d3df3087 2003-12-06 devnull 			return 0;
313 d3df3087 2003-12-06 devnull 		f->stat = p;
314 d3df3087 2003-12-06 devnull 		p += f->nstat;
315 d3df3087 2003-12-06 devnull 		break;
316 d3df3087 2003-12-06 devnull 
317 d3df3087 2003-12-06 devnull 	case Rwstat:
318 d3df3087 2003-12-06 devnull 		break;
319 d3df3087 2003-12-06 devnull 	}
320 d3df3087 2003-12-06 devnull 
321 d3df3087 2003-12-06 devnull 	if(p==nil || p>ep)
322 d3df3087 2003-12-06 devnull 		return 0;
323 d3df3087 2003-12-06 devnull 	if(ap+size == p)
324 d3df3087 2003-12-06 devnull 		return size;
325 d3df3087 2003-12-06 devnull 	return 0;
326 d3df3087 2003-12-06 devnull }