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Date:: Thu Dec 11 17:48:38 2003 UTC
Message:: Add support for user-level 9P servers/clients and various bug fixes to go with them.
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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 d3df3087 2003-12-06 devnull 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 d3df3087 2003-12-06 devnull 		break;
104 d3df3087 2003-12-06 devnull 
105 d3df3087 2003-12-06 devnull 	case Tattach:
106 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
107 d3df3087 2003-12-06 devnull 			return 0;
108 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
109 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
110 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
111 d3df3087 2003-12-06 devnull 			return 0;
112 d3df3087 2003-12-06 devnull 		f->afid = GBIT32(p);
113 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
114 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->uname);
115 d3df3087 2003-12-06 devnull 		if(p == nil)
116 d3df3087 2003-12-06 devnull 			break;
117 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->aname);
118 d3df3087 2003-12-06 devnull 		if(p == nil)
119 d3df3087 2003-12-06 devnull 			break;
120 d3df3087 2003-12-06 devnull 		break;
121 d3df3087 2003-12-06 devnull 
122 d3df3087 2003-12-06 devnull 	case Twalk:
123 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT32SZ+BIT16SZ > ep)
124 d3df3087 2003-12-06 devnull 			return 0;
125 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
126 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
127 d3df3087 2003-12-06 devnull 		f->newfid = GBIT32(p);
128 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
129 d3df3087 2003-12-06 devnull 		f->nwname = GBIT16(p);
130 d3df3087 2003-12-06 devnull 		p += BIT16SZ;
131 d3df3087 2003-12-06 devnull 		if(f->nwname > MAXWELEM)
132 d3df3087 2003-12-06 devnull 			return 0;
133 d3df3087 2003-12-06 devnull 		for(i=0; i<f->nwname; i++){
134 d3df3087 2003-12-06 devnull 			p = gstring(p, ep, &f->wname[i]);
135 d3df3087 2003-12-06 devnull 			if(p == nil)
136 d3df3087 2003-12-06 devnull 				break;
137 d3df3087 2003-12-06 devnull 		}
138 d3df3087 2003-12-06 devnull 		break;
139 d3df3087 2003-12-06 devnull 
140 d3df3087 2003-12-06 devnull 	case Topen:
141 32f69c36 2003-12-11 devnull 	case Topenfd:
142 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT8SZ > ep)
143 d3df3087 2003-12-06 devnull 			return 0;
144 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
145 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
146 d3df3087 2003-12-06 devnull 		f->mode = GBIT8(p);
147 d3df3087 2003-12-06 devnull 		p += BIT8SZ;
148 d3df3087 2003-12-06 devnull 		break;
149 d3df3087 2003-12-06 devnull 
150 d3df3087 2003-12-06 devnull 	case Tcreate:
151 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
152 d3df3087 2003-12-06 devnull 			return 0;
153 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
154 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
155 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->name);
156 d3df3087 2003-12-06 devnull 		if(p == nil)
157 d3df3087 2003-12-06 devnull 			break;
158 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT8SZ > ep)
159 d3df3087 2003-12-06 devnull 			return 0;
160 d3df3087 2003-12-06 devnull 		f->perm = GBIT32(p);
161 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
162 d3df3087 2003-12-06 devnull 		f->mode = GBIT8(p);
163 d3df3087 2003-12-06 devnull 		p += BIT8SZ;
164 d3df3087 2003-12-06 devnull 		break;
165 d3df3087 2003-12-06 devnull 
166 d3df3087 2003-12-06 devnull 	case Tread:
167 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT64SZ+BIT32SZ > ep)
168 d3df3087 2003-12-06 devnull 			return 0;
169 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
170 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
171 d3df3087 2003-12-06 devnull 		f->offset = GBIT64(p);
172 d3df3087 2003-12-06 devnull 		p += BIT64SZ;
173 d3df3087 2003-12-06 devnull 		f->count = GBIT32(p);
174 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
175 d3df3087 2003-12-06 devnull 		break;
176 d3df3087 2003-12-06 devnull 
177 d3df3087 2003-12-06 devnull 	case Twrite:
178 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT64SZ+BIT32SZ > ep)
179 d3df3087 2003-12-06 devnull 			return 0;
180 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
181 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
182 d3df3087 2003-12-06 devnull 		f->offset = GBIT64(p);
183 d3df3087 2003-12-06 devnull 		p += BIT64SZ;
184 d3df3087 2003-12-06 devnull 		f->count = GBIT32(p);
185 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
186 d3df3087 2003-12-06 devnull 		if(p+f->count > ep)
187 d3df3087 2003-12-06 devnull 			return 0;
188 d3df3087 2003-12-06 devnull 		f->data = (char*)p;
189 d3df3087 2003-12-06 devnull 		p += f->count;
190 d3df3087 2003-12-06 devnull 		break;
191 d3df3087 2003-12-06 devnull 
192 d3df3087 2003-12-06 devnull 	case Tclunk:
193 d3df3087 2003-12-06 devnull 	case Tremove:
194 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
195 d3df3087 2003-12-06 devnull 			return 0;
196 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
197 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
198 d3df3087 2003-12-06 devnull 		break;
199 d3df3087 2003-12-06 devnull 
200 d3df3087 2003-12-06 devnull 	case Tstat:
201 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
202 d3df3087 2003-12-06 devnull 			return 0;
203 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
204 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
205 d3df3087 2003-12-06 devnull 		break;
206 d3df3087 2003-12-06 devnull 
207 d3df3087 2003-12-06 devnull 	case Twstat:
208 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ+BIT16SZ > ep)
209 d3df3087 2003-12-06 devnull 			return 0;
210 d3df3087 2003-12-06 devnull 		f->fid = GBIT32(p);
211 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
212 d3df3087 2003-12-06 devnull 		f->nstat = GBIT16(p);
213 d3df3087 2003-12-06 devnull 		p += BIT16SZ;
214 d3df3087 2003-12-06 devnull 		if(p+f->nstat > ep)
215 d3df3087 2003-12-06 devnull 			return 0;
216 d3df3087 2003-12-06 devnull 		f->stat = p;
217 d3df3087 2003-12-06 devnull 		p += f->nstat;
218 d3df3087 2003-12-06 devnull 		break;
219 d3df3087 2003-12-06 devnull 
220 d3df3087 2003-12-06 devnull /*
221 d3df3087 2003-12-06 devnull  */
222 d3df3087 2003-12-06 devnull 	case Rversion:
223 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
224 d3df3087 2003-12-06 devnull 			return 0;
225 d3df3087 2003-12-06 devnull 		f->msize = GBIT32(p);
226 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
227 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->version);
228 d3df3087 2003-12-06 devnull 		break;
229 d3df3087 2003-12-06 devnull 
230 d3df3087 2003-12-06 devnull 	case Rerror:
231 d3df3087 2003-12-06 devnull 		p = gstring(p, ep, &f->ename);
232 d3df3087 2003-12-06 devnull 		break;
233 d3df3087 2003-12-06 devnull 
234 d3df3087 2003-12-06 devnull 	case Rflush:
235 d3df3087 2003-12-06 devnull 		break;
236 d3df3087 2003-12-06 devnull 
237 d3df3087 2003-12-06 devnull 	case Rauth:
238 d3df3087 2003-12-06 devnull 		p = gqid(p, ep, &f->aqid);
239 d3df3087 2003-12-06 devnull 		if(p == nil)
240 d3df3087 2003-12-06 devnull 			break;
241 d3df3087 2003-12-06 devnull 		break;
242 d3df3087 2003-12-06 devnull 
243 d3df3087 2003-12-06 devnull 	case Rattach:
244 d3df3087 2003-12-06 devnull 		p = gqid(p, ep, &f->qid);
245 d3df3087 2003-12-06 devnull 		if(p == nil)
246 d3df3087 2003-12-06 devnull 			break;
247 d3df3087 2003-12-06 devnull 		break;
248 d3df3087 2003-12-06 devnull 
249 d3df3087 2003-12-06 devnull 	case Rwalk:
250 d3df3087 2003-12-06 devnull 		if(p+BIT16SZ > ep)
251 d3df3087 2003-12-06 devnull 			return 0;
252 d3df3087 2003-12-06 devnull 		f->nwqid = GBIT16(p);
253 d3df3087 2003-12-06 devnull 		p += BIT16SZ;
254 d3df3087 2003-12-06 devnull 		if(f->nwqid > MAXWELEM)
255 d3df3087 2003-12-06 devnull 			return 0;
256 d3df3087 2003-12-06 devnull 		for(i=0; i<f->nwqid; i++){
257 d3df3087 2003-12-06 devnull 			p = gqid(p, ep, &f->wqid[i]);
258 d3df3087 2003-12-06 devnull 			if(p == nil)
259 d3df3087 2003-12-06 devnull 				break;
260 d3df3087 2003-12-06 devnull 		}
261 d3df3087 2003-12-06 devnull 		break;
262 d3df3087 2003-12-06 devnull 
263 d3df3087 2003-12-06 devnull 	case Ropen:
264 32f69c36 2003-12-11 devnull 	case Ropenfd:
265 d3df3087 2003-12-06 devnull 	case Rcreate:
266 d3df3087 2003-12-06 devnull 		p = gqid(p, ep, &f->qid);
267 d3df3087 2003-12-06 devnull 		if(p == nil)
268 d3df3087 2003-12-06 devnull 			break;
269 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
270 d3df3087 2003-12-06 devnull 			return 0;
271 d3df3087 2003-12-06 devnull 		f->iounit = GBIT32(p);
272 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
273 32f69c36 2003-12-11 devnull 		if(f->type == Ropenfd){
274 32f69c36 2003-12-11 devnull 			if(p+BIT32SZ > ep)
275 32f69c36 2003-12-11 devnull 				return 0;
276 32f69c36 2003-12-11 devnull 			f->unixfd = GBIT32(p);
277 32f69c36 2003-12-11 devnull 			p += BIT32SZ;
278 32f69c36 2003-12-11 devnull 		}
279 d3df3087 2003-12-06 devnull 		break;
280 d3df3087 2003-12-06 devnull 
281 d3df3087 2003-12-06 devnull 	case Rread:
282 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
283 d3df3087 2003-12-06 devnull 			return 0;
284 d3df3087 2003-12-06 devnull 		f->count = GBIT32(p);
285 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
286 d3df3087 2003-12-06 devnull 		if(p+f->count > ep)
287 d3df3087 2003-12-06 devnull 			return 0;
288 d3df3087 2003-12-06 devnull 		f->data = (char*)p;
289 d3df3087 2003-12-06 devnull 		p += f->count;
290 d3df3087 2003-12-06 devnull 		break;
291 d3df3087 2003-12-06 devnull 
292 d3df3087 2003-12-06 devnull 	case Rwrite:
293 d3df3087 2003-12-06 devnull 		if(p+BIT32SZ > ep)
294 d3df3087 2003-12-06 devnull 			return 0;
295 d3df3087 2003-12-06 devnull 		f->count = GBIT32(p);
296 d3df3087 2003-12-06 devnull 		p += BIT32SZ;
297 d3df3087 2003-12-06 devnull 		break;
298 d3df3087 2003-12-06 devnull 
299 d3df3087 2003-12-06 devnull 	case Rclunk:
300 d3df3087 2003-12-06 devnull 	case Rremove:
301 d3df3087 2003-12-06 devnull 		break;
302 d3df3087 2003-12-06 devnull 
303 d3df3087 2003-12-06 devnull 	case Rstat:
304 d3df3087 2003-12-06 devnull 		if(p+BIT16SZ > ep)
305 d3df3087 2003-12-06 devnull 			return 0;
306 d3df3087 2003-12-06 devnull 		f->nstat = GBIT16(p);
307 d3df3087 2003-12-06 devnull 		p += BIT16SZ;
308 d3df3087 2003-12-06 devnull 		if(p+f->nstat > ep)
309 d3df3087 2003-12-06 devnull 			return 0;
310 d3df3087 2003-12-06 devnull 		f->stat = p;
311 d3df3087 2003-12-06 devnull 		p += f->nstat;
312 d3df3087 2003-12-06 devnull 		break;
313 d3df3087 2003-12-06 devnull 
314 d3df3087 2003-12-06 devnull 	case Rwstat:
315 d3df3087 2003-12-06 devnull 		break;
316 d3df3087 2003-12-06 devnull 	}
317 d3df3087 2003-12-06 devnull 
318 d3df3087 2003-12-06 devnull 	if(p==nil || p>ep)
319 d3df3087 2003-12-06 devnull 		return 0;
320 d3df3087 2003-12-06 devnull 	if(ap+size == p)
321 d3df3087 2003-12-06 devnull 		return size;
322 d3df3087 2003-12-06 devnull 	return 0;
323 d3df3087 2003-12-06 devnull }