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 d3df3087 2003-12-06 devnull convM2S(uchar *ap, uint nap, Fcall *f)
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;
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;
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;
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;
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;
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;
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);
230 d3df3087 2003-12-06 devnull case Rerror:
231 d3df3087 2003-12-06 devnull p = gstring(p, ep, &f->ename);
234 d3df3087 2003-12-06 devnull case Rflush:
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)
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)
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)
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)
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;
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;
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;
299 d3df3087 2003-12-06 devnull case Rclunk:
300 d3df3087 2003-12-06 devnull case Rremove:
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;
314 d3df3087 2003-12-06 devnull case Rwstat:
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;