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 74dd0321 2010-12-07 rsc 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)
103 8ff457f5 2009-08-20 tim.newsh f->uidnum = NOUID;
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)
118 d3df3087 2003-12-06 devnull p = gstring(p, ep, &f->aname);
119 d3df3087 2003-12-06 devnull if(p == nil)
121 8ff457f5 2009-08-20 tim.newsh f->uidnum = NOUID;
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)
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;
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)
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;
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;
237 d3df3087 2003-12-06 devnull case Rflush:
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)
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)
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)
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)
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;
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;
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;
302 d3df3087 2003-12-06 devnull case Rclunk:
303 d3df3087 2003-12-06 devnull case Rremove:
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;
317 d3df3087 2003-12-06 devnull case Rwstat:
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;