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>
7 d3df3087 2003-12-06 devnull gstring(uchar *p, uchar *ep, char **s)
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;
27 d3df3087 2003-12-06 devnull gqid(uchar *p, uchar *ep, Qid *q)
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;
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.
51 fb941e08 2005-09-13 devnull convM2Su(uchar *ap, uint nap, Fcall *f, int dotu)
53 d3df3087 2003-12-06 devnull uchar *p, *ep;
54 d3df3087 2003-12-06 devnull uint i, size;
57 d3df3087 2003-12-06 devnull ep = p + nap;
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;
64 d3df3087 2003-12-06 devnull if(size < BIT32SZ+BIT8SZ+BIT16SZ)
65 d3df3087 2003-12-06 devnull return 0;
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;
72 d3df3087 2003-12-06 devnull switch(f->type)
75 d3df3087 2003-12-06 devnull return 0;
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);
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;
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)
100 d3df3087 2003-12-06 devnull p = gstring(p, ep, &f->aname);
101 d3df3087 2003-12-06 devnull if(p == nil)
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)
117 d3df3087 2003-12-06 devnull p = gstring(p, ep, &f->aname);
118 d3df3087 2003-12-06 devnull if(p == nil)
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)
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;
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)
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 b5c7be2f 2006-03-03 devnull if(dotu)
165 b5c7be2f 2006-03-03 devnull p = gstring(p, ep, &f->extension);
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;
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;
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;
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;
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;
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);
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 fb941e08 2005-09-13 devnull if(dotu){
236 fb941e08 2005-09-13 devnull if(p+BIT16SZ > ep)
237 fb941e08 2005-09-13 devnull return 0;
238 fb941e08 2005-09-13 devnull f->errornum = GBIT16(p);
239 fb941e08 2005-09-13 devnull p += BIT16SZ;
243 d3df3087 2003-12-06 devnull case Rflush:
246 d3df3087 2003-12-06 devnull case Rauth:
247 d3df3087 2003-12-06 devnull p = gqid(p, ep, &f->aqid);
248 d3df3087 2003-12-06 devnull if(p == nil)
252 d3df3087 2003-12-06 devnull case Rattach:
253 d3df3087 2003-12-06 devnull p = gqid(p, ep, &f->qid);
254 d3df3087 2003-12-06 devnull if(p == nil)
258 d3df3087 2003-12-06 devnull case Rwalk:
259 d3df3087 2003-12-06 devnull if(p+BIT16SZ > ep)
260 d3df3087 2003-12-06 devnull return 0;
261 d3df3087 2003-12-06 devnull f->nwqid = GBIT16(p);
262 d3df3087 2003-12-06 devnull p += BIT16SZ;
263 d3df3087 2003-12-06 devnull if(f->nwqid > MAXWELEM)
264 d3df3087 2003-12-06 devnull return 0;
265 d3df3087 2003-12-06 devnull for(i=0; i<f->nwqid; i++){
266 d3df3087 2003-12-06 devnull p = gqid(p, ep, &f->wqid[i]);
267 d3df3087 2003-12-06 devnull if(p == nil)
272 d3df3087 2003-12-06 devnull case Ropen:
273 32f69c36 2003-12-11 devnull case Ropenfd:
274 d3df3087 2003-12-06 devnull case Rcreate:
275 d3df3087 2003-12-06 devnull p = gqid(p, ep, &f->qid);
276 d3df3087 2003-12-06 devnull if(p == nil)
278 d3df3087 2003-12-06 devnull if(p+BIT32SZ > ep)
279 d3df3087 2003-12-06 devnull return 0;
280 d3df3087 2003-12-06 devnull f->iounit = GBIT32(p);
281 d3df3087 2003-12-06 devnull p += BIT32SZ;
282 32f69c36 2003-12-11 devnull if(f->type == Ropenfd){
283 32f69c36 2003-12-11 devnull if(p+BIT32SZ > ep)
284 32f69c36 2003-12-11 devnull return 0;
285 32f69c36 2003-12-11 devnull f->unixfd = GBIT32(p);
286 32f69c36 2003-12-11 devnull p += BIT32SZ;
290 d3df3087 2003-12-06 devnull case Rread:
291 d3df3087 2003-12-06 devnull if(p+BIT32SZ > ep)
292 d3df3087 2003-12-06 devnull return 0;
293 d3df3087 2003-12-06 devnull f->count = GBIT32(p);
294 d3df3087 2003-12-06 devnull p += BIT32SZ;
295 d3df3087 2003-12-06 devnull if(p+f->count > ep)
296 d3df3087 2003-12-06 devnull return 0;
297 d3df3087 2003-12-06 devnull f->data = (char*)p;
298 d3df3087 2003-12-06 devnull p += f->count;
301 d3df3087 2003-12-06 devnull case Rwrite:
302 d3df3087 2003-12-06 devnull if(p+BIT32SZ > ep)
303 d3df3087 2003-12-06 devnull return 0;
304 d3df3087 2003-12-06 devnull f->count = GBIT32(p);
305 d3df3087 2003-12-06 devnull p += BIT32SZ;
308 d3df3087 2003-12-06 devnull case Rclunk:
309 d3df3087 2003-12-06 devnull case Rremove:
312 d3df3087 2003-12-06 devnull case Rstat:
313 d3df3087 2003-12-06 devnull if(p+BIT16SZ > ep)
314 d3df3087 2003-12-06 devnull return 0;
315 d3df3087 2003-12-06 devnull f->nstat = GBIT16(p);
316 d3df3087 2003-12-06 devnull p += BIT16SZ;
317 d3df3087 2003-12-06 devnull if(p+f->nstat > ep)
318 d3df3087 2003-12-06 devnull return 0;
319 d3df3087 2003-12-06 devnull f->stat = p;
320 d3df3087 2003-12-06 devnull p += f->nstat;
323 d3df3087 2003-12-06 devnull case Rwstat:
327 d3df3087 2003-12-06 devnull if(p==nil || p>ep)
328 d3df3087 2003-12-06 devnull return 0;
329 d3df3087 2003-12-06 devnull if(ap+size == p)
330 d3df3087 2003-12-06 devnull return size;
331 d3df3087 2003-12-06 devnull return 0;
335 fb941e08 2005-09-13 devnull convM2S(uchar *ap, uint nap, Fcall *f)
337 fb941e08 2005-09-13 devnull return convM2Su(ap, nap, f, 0);