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| 1 | +/* | |
| 2 | + * This is 9p client and server implementation which aims to be | |
| 3 | + * correct, small and secure. It's the lowest level implementation. | |
| 4 | + * It doesn't have much comments, mostly because it doesn't make | |
| 5 | + * any sense to copy-paste protocol documentation, which | |
| 6 | + * you can read at http://man.cat-v.org/plan_9/5/, see 'intro'. | |
| 7 | + */ | |
| 8 | +#include <string.h> | |
| 9 | +#include <stdint.h> | |
| 10 | +#include "c9.h" | |
| 11 | + | |
| 12 | +enum | |
| 13 | +{ | |
| 14 | + Svver = 1<<0, | |
| 15 | +}; | |
| 16 | + | |
| 17 | +#define safestrlen(s) (s == NULL ? 0 : (uint32_t)strlen(s)) | |
| 18 | +#define maxread(c) (c->msize-4-4-1-2) | |
| 19 | +#define maxwrite(c) maxread(c) | |
| 20 | + | |
| 21 | +static void | |
| 22 | +w08(uint8_t **p, uint8_t x) | |
| 23 | +{ | |
| 24 | + (*p)[0] = x; | |
| 25 | + *p += 1; | |
| 26 | +} | |
| 27 | + | |
| 28 | +static void | |
| 29 | +w16(uint8_t **p, uint16_t x) | |
| 30 | +{ | |
| 31 | + (*p)[0] = x; | |
| 32 | + (*p)[1] = x>>8; | |
| 33 | + *p += 2; | |
| 34 | +} | |
| 35 | + | |
| 36 | +static void | |
| 37 | +w32(uint8_t **p, uint32_t x) | |
| 38 | +{ | |
| 39 | + (*p)[0] = x; | |
| 40 | + (*p)[1] = x>>8; | |
| 41 | + (*p)[2] = x>>16; | |
| 42 | + (*p)[3] = x>>24; | |
| 43 | + *p += 4; | |
| 44 | +} | |
| 45 | + | |
| 46 | +static void | |
| 47 | +w64(uint8_t **p, uint64_t x) | |
| 48 | +{ | |
| 49 | + (*p)[0] = x; | |
| 50 | + (*p)[1] = x>>8; | |
| 51 | + (*p)[2] = x>>16; | |
| 52 | + (*p)[3] = x>>24; | |
| 53 | + (*p)[4] = x>>32; | |
| 54 | + (*p)[5] = x>>40; | |
| 55 | + (*p)[6] = x>>48; | |
| 56 | + (*p)[7] = x>>56; | |
| 57 | + *p += 8; | |
| 58 | +} | |
| 59 | + | |
| 60 | +static void | |
| 61 | +wcs(uint8_t **p, const char *s, int len) | |
| 62 | +{ | |
| 63 | + w16(p, len); | |
| 64 | + if(s != NULL){ | |
| 65 | + memmove(*p, s, len); | |
| 66 | + *p += len; | |
| 67 | + } | |
| 68 | +} | |
| 69 | + | |
| 70 | +static uint8_t | |
| 71 | +r08(uint8_t **p) | |
| 72 | +{ | |
| 73 | + *p += 1; | |
| 74 | + return (*p)[-1]; | |
| 75 | +} | |
| 76 | + | |
| 77 | +static uint16_t | |
| 78 | +r16(uint8_t **p) | |
| 79 | +{ | |
| 80 | + *p += 2; | |
| 81 | + return (uint16_t)(*p)[-2]<<0 | (uint16_t)(*p)[-1]<<8; | |
| 82 | +} | |
| 83 | + | |
| 84 | +static uint32_t | |
| 85 | +r32(uint8_t **p) | |
| 86 | +{ | |
| 87 | + return r16(p) | (uint32_t)r16(p)<<16; | |
| 88 | +} | |
| 89 | + | |
| 90 | +static uint64_t | |
| 91 | +r64(uint8_t **p) | |
| 92 | +{ | |
| 93 | + return r32(p) | (uint64_t)r32(p)<<32; | |
| 94 | +} | |
| 95 | + | |
| 96 | +static C9error | |
| 97 | +newtag(C9ctx *c, C9ttype type, C9tag *tag) | |
| 98 | +{ | |
| 99 | + uint32_t i; | |
| 100 | + | |
| 101 | + if(type == Tversion){ | |
| 102 | + *tag = 0xffff; | |
| 103 | + return 0; | |
| 104 | + } | |
| 105 | + | |
| 106 | + if(c->lowfreetag < C9maxtags){ | |
| 107 | + uint32_t d = c->lowfreetag / C9tagsbits, m = c->lowfreetag % C9tagsbits; | |
| 108 | + if((c->tags[d] & 1<<m) != 0){ | |
| 109 | + c->tags[d] &= ~(1<<m); | |
| 110 | + *tag = c->lowfreetag++; | |
| 111 | + return 0; | |
| 112 | + } | |
| 113 | + } | |
| 114 | + | |
| 115 | + for(i = 0; i < (int)sizeof(c->tags)/sizeof(c->tags[0]); i++){ | |
| 116 | + uint32_t x, j; | |
| 117 | + if((x = c->tags[i]) == 0) | |
| 118 | + continue; | |
| 119 | + for(j = 0; j < C9tagsbits; j++){ | |
| 120 | + if((x & (1<<j)) != 0){ | |
| 121 | + c->tags[i] &= ~(1<<j); | |
| 122 | + *tag = i*C9tagsbits + j; | |
| 123 | + c->lowfreetag = *tag + 1; | |
| 124 | + return 0; | |
| 125 | + } | |
| 126 | + } | |
| 127 | + } | |
| 128 | + | |
| 129 | + c->error("newtag: no free tags"); | |
| 130 | + return C9Etag; | |
| 131 | +} | |
| 132 | + | |
| 133 | +static int | |
| 134 | +freetag(C9ctx *c, C9tag tag) | |
| 135 | +{ | |
| 136 | + if(tag != 0xffff){ | |
| 137 | + uint32_t d = tag / C9tagsbits, m = tag % C9tagsbits; | |
| 138 | + if(tag >= C9maxtags){ | |
| 139 | + c->error("freetag: invalid tag"); | |
| 140 | + return -1; | |
| 141 | + } | |
| 142 | + if((c->tags[d] & 1<<m) != 0){ | |
| 143 | + c->error("freetag: double free"); | |
| 144 | + return -1; | |
| 145 | + } | |
| 146 | + if(c->lowfreetag > tag) | |
| 147 | + c->lowfreetag = tag; | |
| 148 | + c->tags[d] |= 1<<m; | |
| 149 | + } | |
| 150 | + return 0; | |
| 151 | +} | |
| 152 | + | |
| 153 | +static uint8_t * | |
| 154 | +T(C9ctx *c, uint32_t size, C9ttype type, C9tag *tag, C9error *err) | |
| 155 | +{ | |
| 156 | + uint8_t *p = NULL; | |
| 157 | + | |
| 158 | + if(size > c->msize-4-1-2){ | |
| 159 | + c->error("T: invalid size"); | |
| 160 | + *err = C9Esize; | |
| 161 | + }else if((*err = newtag(c, type, tag)) == 0){ | |
| 162 | + size += 4+1+2; | |
| 163 | + if((p = c->begin(c, size)) == NULL){ | |
| 164 | + c->error("T: no buffer"); | |
| 165 | + freetag(c, *tag); | |
| 166 | + *err = C9Ebuf; | |
| 167 | + }else{ | |
| 168 | + *err = 0; | |
| 169 | + w32(&p, size); | |
| 170 | + w08(&p, type); | |
| 171 | + w16(&p, *tag); | |
| 172 | + } | |
| 173 | + } | |
| 174 | + return p; | |
| 175 | +} | |
| 176 | + | |
| 177 | +static uint8_t * | |
| 178 | +R(C9ctx *c, uint32_t size, C9rtype type, C9tag tag, C9error *err) | |
| 179 | +{ | |
| 180 | + uint8_t *p = NULL; | |
| 181 | + | |
| 182 | + if(size > c->msize-4-1-2){ | |
| 183 | + c->error("R: invalid size"); | |
| 184 | + *err = C9Esize; | |
| 185 | + }else{ | |
| 186 | + size += 4+1+2; | |
| 187 | + if((p = c->begin(c, size)) == NULL){ | |
| 188 | + c->error("R: no buffer"); | |
| 189 | + *err = C9Ebuf; | |
| 190 | + }else{ | |
| 191 | + *err = 0; | |
| 192 | + w32(&p, size); | |
| 193 | + w08(&p, type); | |
| 194 | + w16(&p, tag); | |
| 195 | + } | |
| 196 | + } | |
| 197 | + return p; | |
| 198 | +} | |
| 199 | + | |
| 200 | +C9error | |
| 201 | +c9parsedir(C9ctx *c, C9stat *stat, uint8_t **t, uint32_t *size) | |
| 202 | +{ | |
| 203 | + uint8_t *b; | |
| 204 | + uint32_t cnt, sz; | |
| 205 | + | |
| 206 | + if(*size < 49 || (sz = r16(t)) < 47 || *size < 2+sz) | |
| 207 | + goto error; | |
| 208 | + *size -= 2+sz; | |
| 209 | + *t += 6; /* skip type(2) and dev(4) */ | |
| 210 | + stat->qid.type = r08(t); | |
| 211 | + stat->qid.version = r32(t); | |
| 212 | + stat->qid.path = r64(t); | |
| 213 | + stat->mode = r32(t); | |
| 214 | + stat->atime = r32(t); | |
| 215 | + stat->mtime = r32(t); | |
| 216 | + stat->size = r64(t); | |
| 217 | + sz -= 39; | |
| 218 | + if((cnt = r16(t)) > sz-2) | |
| 219 | + goto error; | |
| 220 | + stat->name = (char*)*t; b = *t = *t+cnt; sz -= 2+cnt; | |
| 221 | + if(sz < 2 || (cnt = r16(t)) > sz-2) | |
| 222 | + goto error; | |
| 223 | + stat->uid = (char*)*t; *b = 0; b = *t = *t+cnt; sz -= 2+cnt; | |
| 224 | + if(sz < 2 || (cnt = r16(t)) > sz-2) | |
| 225 | + goto error; | |
| 226 | + stat->gid = (char*)*t; *b = 0; b = *t = *t+cnt; sz -= 2+cnt; | |
| 227 | + if(sz < 2 || (cnt = r16(t)) > sz-2) | |
| 228 | + goto error; | |
| 229 | + stat->muid = memmove(*t-1, *t, cnt); *b = stat->muid[cnt] = 0; *t = *t+cnt; sz -= 2+cnt; | |
| 230 | + *t += sz; | |
| 231 | + return 0; | |
| 232 | +error: | |
| 233 | + c->error("c9parsedir: invalid size"); | |
| 234 | + return C9Epkt; | |
| 235 | +} | |
| 236 | + | |
| 237 | +C9error | |
| 238 | +c9version(C9ctx *c, C9tag *tag, uint32_t msize) | |
| 239 | +{ | |
| 240 | + uint8_t *b; | |
| 241 | + C9error err; | |
| 242 | + | |
| 243 | + if(msize < C9minmsize){ | |
| 244 | + c->error("c9version: msize too small"); | |
| 245 | + return C9Einit; | |
| 246 | + } | |
| 247 | + memset(c->tags, 0xff, sizeof(c->tags)); | |
| 248 | + memset(c->flush, 0xff, sizeof(c->flush)); | |
| 249 | + c->lowfreetag = 0; | |
| 250 | + c->msize = msize; | |
| 251 | + | |
| 252 | + if((b = T(c, 4+2+6, Tversion, tag, &err)) != NULL){ | |
| 253 | + w32(&b, msize); | |
| 254 | + wcs(&b, "9P2000", 6); | |
| 255 | + err = c->end(c); | |
| 256 | + } | |
| 257 | + return err; | |
| 258 | +} | |
| 259 | + | |
| 260 | +C9error | |
| 261 | +c9auth(C9ctx *c, C9tag *tag, C9fid afid, const char *uname, const char *aname) | |
| 262 | +{ | |
| 263 | + uint8_t *b; | |
| 264 | + uint32_t ulen = safestrlen(uname), alen = safestrlen(aname); | |
| 265 | + C9error err; | |
| 266 | + | |
| 267 | + if(ulen > C9maxstr || alen > C9maxstr){ | |
| 268 | + c->error("c9auth: string too long"); | |
| 269 | + return C9Estr; | |
| 270 | + } | |
| 271 | + if((b = T(c, 4+2+ulen+2+alen, Tauth, tag, &err)) != NULL){ | |
| 272 | + w32(&b, afid); | |
| 273 | + wcs(&b, uname, ulen); | |
| 274 | + wcs(&b, aname, alen); | |
| 275 | + err = c->end(c); | |
| 276 | + } | |
| 277 | + return err; | |
| 278 | +} | |
| 279 | + | |
| 280 | +C9error | |
| 281 | +c9flush(C9ctx *c, C9tag *tag, C9tag oldtag) | |
| 282 | +{ | |
| 283 | + uint8_t *b; | |
| 284 | + C9error err; | |
| 285 | + int i; | |
| 286 | + | |
| 287 | + for(i = 0; i < C9maxflush && c->flush[i] != (uint32_t)~0; i++); | |
| 288 | + if(i == C9maxflush){ | |
| 289 | + c->error("c9flush: no free flush slots"); | |
| 290 | + return C9Eflush; | |
| 291 | + } | |
| 292 | + if((b = T(c, 2, Tflush, tag, &err)) != NULL){ | |
| 293 | + w16(&b, oldtag); | |
| 294 | + err = c->end(c); | |
| 295 | + if(err == 0) | |
| 296 | + c->flush[i] = (uint32_t)oldtag<<16 | *tag; | |
| 297 | + } | |
| 298 | + return err; | |
| 299 | +} | |
| 300 | + | |
| 301 | +C9error | |
| 302 | +c9attach(C9ctx *c, C9tag *tag, C9fid fid, C9fid afid, const char *uname, const char *aname) | |
| 303 | +{ | |
| 304 | + uint32_t ulen = safestrlen(uname), alen = safestrlen(aname); | |
| 305 | + uint8_t *b; | |
| 306 | + C9error err; | |
| 307 | + | |
| 308 | + if(ulen > C9maxstr || alen > C9maxstr){ | |
| 309 | + c->error("c9attach: string too long"); | |
| 310 | + return C9Estr; | |
| 311 | + } | |
| 312 | + if((b = T(c, 4+4+2+ulen+2+alen, Tattach, tag, &err)) != NULL){ | |
| 313 | + w32(&b, fid); | |
| 314 | + w32(&b, afid); | |
| 315 | + wcs(&b, uname, ulen); | |
| 316 | + wcs(&b, aname, alen); | |
| 317 | + err = c->end(c); | |
| 318 | + } | |
| 319 | + return err; | |
| 320 | +} | |
| 321 | + | |
| 322 | +C9error | |
| 323 | +c9walk(C9ctx *c, C9tag *tag, C9fid fid, C9fid newfid, const char *path[]) | |
| 324 | +{ | |
| 325 | + uint32_t i, j, sz; | |
| 326 | + uint32_t len[C9maxpathel]; | |
| 327 | + uint8_t *b; | |
| 328 | + C9error err; | |
| 329 | + | |
| 330 | + for(sz = i = 0; i < (int)sizeof(len)/sizeof(len[0]) && path[i] != NULL; i++){ | |
| 331 | + len[i] = safestrlen(path[i]); | |
| 332 | + if(len[i] == 0 || len[i] > C9maxstr){ | |
| 333 | + c->error("c9walk: path element too long"); | |
| 334 | + return C9Epath; | |
| 335 | + } | |
| 336 | + sz += 2 + len[i]; | |
| 337 | + } | |
| 338 | + if(path[i] != NULL || i == 0){ | |
| 339 | + c->error("c9walk: invalid elements !(0 < %d <= %d)", i, C9maxpathel); | |
| 340 | + return C9Epath; | |
| 341 | + } | |
| 342 | + | |
| 343 | + if((b = T(c, 4+4+2+sz, Twalk, tag, &err)) != NULL){ | |
| 344 | + w32(&b, fid); | |
| 345 | + w32(&b, newfid); | |
| 346 | + w16(&b, i); | |
| 347 | + for(j = 0; j < i; j++) | |
| 348 | + wcs(&b, path[j], len[j]); | |
| 349 | + err = c->end(c); | |
| 350 | + } | |
| 351 | + return err; | |
| 352 | +} | |
| 353 | + | |
| 354 | +C9error | |
| 355 | +c9open(C9ctx *c, C9tag *tag, C9fid fid, C9mode mode) | |
| 356 | +{ | |
| 357 | + uint8_t *b; | |
| 358 | + C9error err; | |
| 359 | + | |
| 360 | + if((b = T(c, 4+1, Topen, tag, &err)) != NULL){ | |
| 361 | + w32(&b, fid); | |
| 362 | + w08(&b, mode); | |
| 363 | + err = c->end(c); | |
| 364 | + } | |
| 365 | + return err; | |
| 366 | +} | |
| 367 | + | |
| 368 | +C9error | |
| 369 | +c9create(C9ctx *c, C9tag *tag, C9fid fid, const char *name, uint32_t perm, C9mode mode) | |
| 370 | +{ | |
| 371 | + uint32_t nlen = strlen(name); | |
| 372 | + uint8_t *b; | |
| 373 | + C9error err; | |
| 374 | + | |
| 375 | + if(nlen == 0 || nlen > C9maxstr){ | |
| 376 | + c->error("c9create: invalid name"); | |
| 377 | + return C9Epath; | |
| 378 | + } | |
| 379 | + if((b = T(c, 4+2+nlen+4+1, Tcreate, tag, &err)) != NULL){ | |
| 380 | + w32(&b, fid); | |
| 381 | + wcs(&b, name, nlen); | |
| 382 | + w32(&b, perm); | |
| 383 | + w08(&b, mode); | |
| 384 | + err = c->end(c); | |
| 385 | + } | |
| 386 | + return err; | |
| 387 | +} | |
| 388 | + | |
| 389 | +C9error | |
| 390 | +c9read(C9ctx *c, C9tag *tag, C9fid fid, uint64_t offset, uint32_t count) | |
| 391 | +{ | |
| 392 | + uint8_t *b; | |
| 393 | + C9error err; | |
| 394 | + | |
| 395 | + if((b = T(c, 4+8+4, Tread, tag, &err)) != NULL){ | |
| 396 | + w32(&b, fid); | |
| 397 | + w64(&b, offset); | |
| 398 | + w32(&b, count); | |
| 399 | + err = c->end(c); | |
| 400 | + } | |
| 401 | + return err; | |
| 402 | +} | |
| 403 | + | |
| 404 | +C9error | |
| 405 | +c9write(C9ctx *c, C9tag *tag, C9fid fid, uint64_t offset, const void *in, uint32_t count) | |
| 406 | +{ | |
| 407 | + uint8_t *b; | |
| 408 | + C9error err; | |
| 409 | + | |
| 410 | + if((b = T(c, 4+8+4+count, Twrite, tag, &err)) != NULL){ | |
| 411 | + w32(&b, fid); | |
| 412 | + w64(&b, offset); | |
| 413 | + w32(&b, count); | |
| 414 | + memmove(b, in, count); | |
| 415 | + err = c->end(c); | |
| 416 | + } | |
| 417 | + return err; | |
| 418 | +} | |
| 419 | + | |
| 420 | +C9error | |
| 421 | +c9wrstr(C9ctx *c, C9tag *tag, C9fid fid, const char *s) | |
| 422 | +{ | |
| 423 | + return c9write(c, tag, fid, 0, s, strlen(s)); | |
| 424 | +} | |
| 425 | + | |
| 426 | +C9error | |
| 427 | +c9clunk(C9ctx *c, C9tag *tag, C9fid fid) | |
| 428 | +{ | |
| 429 | + uint8_t *b; | |
| 430 | + C9error err; | |
| 431 | + | |
| 432 | + if((b = T(c, 4, Tclunk, tag, &err)) != NULL){ | |
| 433 | + w32(&b, fid); | |
| 434 | + err = c->end(c); | |
| 435 | + } | |
| 436 | + return err; | |
| 437 | +} | |
| 438 | + | |
| 439 | +C9error | |
| 440 | +c9remove(C9ctx *c, C9tag *tag, C9fid fid) | |
| 441 | +{ | |
| 442 | + uint8_t *b; | |
| 443 | + C9error err; | |
| 444 | + | |
| 445 | + if((b = T(c, 4, Tremove, tag, &err)) != NULL){ | |
| 446 | + w32(&b, fid); | |
| 447 | + err = c->end(c); | |
| 448 | + } | |
| 449 | + return err; | |
| 450 | +} | |
| 451 | + | |
| 452 | +C9error | |
| 453 | +c9stat(C9ctx *c, C9tag *tag, C9fid fid) | |
| 454 | +{ | |
| 455 | + uint8_t *b; | |
| 456 | + C9error err; | |
| 457 | + | |
| 458 | + if((b = T(c, 4, Tstat, tag, &err)) != NULL){ | |
| 459 | + w32(&b, fid); | |
| 460 | + err = c->end(c); | |
| 461 | + } | |
| 462 | + return err; | |
| 463 | +} | |
| 464 | + | |
| 465 | +C9error | |
| 466 | +c9wstat(C9ctx *c, C9tag *tag, C9fid fid, const C9stat *s) | |
| 467 | +{ | |
| 468 | + uint32_t nlen = safestrlen(s->name), ulen = safestrlen(s->uid), glen = safestrlen(s->gid); | |
| 469 | + uint32_t unusedsz = 2+4+13, statsz = unusedsz+4+4+4+8+2+nlen+2+ulen+2+glen+2; | |
| 470 | + uint8_t *b; | |
| 471 | + C9error err; | |
| 472 | + | |
| 473 | + if(nlen == 0 || nlen > C9maxstr){ | |
| 474 | + c->error("c9wstat: invalid name"); | |
| 475 | + return C9Epath; | |
| 476 | + } | |
| 477 | + if(ulen > C9maxstr || glen > C9maxstr){ | |
| 478 | + c->error("c9wstat: string too long"); | |
| 479 | + return C9Estr; | |
| 480 | + } | |
| 481 | + if((b = T(c, 4+2+2+statsz, Twstat, tag, &err)) != NULL){ | |
| 482 | + w32(&b, fid); | |
| 483 | + w16(&b, statsz+2); | |
| 484 | + w16(&b, statsz); | |
| 485 | + memset(b, 0xff, unusedsz); /* leave type(2), dev(4) and qid(13) unchanged */ | |
| 486 | + b += unusedsz; | |
| 487 | + w32(&b, s->mode); | |
| 488 | + w32(&b, s->atime); | |
| 489 | + w32(&b, s->mtime); | |
| 490 | + w64(&b, s->size); | |
| 491 | + wcs(&b, s->name, nlen); | |
| 492 | + wcs(&b, s->uid, ulen); | |
| 493 | + wcs(&b, s->gid, glen); | |
| 494 | + wcs(&b, NULL, 0); /* muid unchanged */ | |
| 495 | + err = c->end(c); | |
| 496 | + } | |
| 497 | + return err; | |
| 498 | +} | |
| 499 | + | |
| 500 | +C9error | |
| 501 | +c9proc(C9ctx *c) | |
| 502 | +{ | |
| 503 | + uint32_t i, sz, cnt, msize; | |
| 504 | + uint8_t *b; | |
| 505 | + int err; | |
| 506 | + C9r r; | |
| 507 | + | |
| 508 | + err = -1; | |
| 509 | + if((b = c->read(c, 4, &err)) == NULL){ | |
| 510 | + if(err != 0) | |
| 511 | + c->error("c9proc: short read"); | |
| 512 | + return err == 0 ? 0 : C9Epkt; | |
| 513 | + } | |
| 514 | + | |
| 515 | + sz = r32(&b); | |
| 516 | + if(sz < 7 || sz > c->msize){ | |
| 517 | + c->error("c9proc: invalid packet size !(7 <= %u <= %u)", sz, c->msize); | |
| 518 | + return C9Epkt; | |
| 519 | + } | |
| 520 | + sz -= 4; | |
| 521 | + err = -1; | |
| 522 | + if((b = c->read(c, sz, &err)) == NULL){ | |
| 523 | + if(err != 0) | |
| 524 | + c->error("c9proc: short read"); | |
| 525 | + return err == 0 ? 0 : C9Epkt; | |
| 526 | + } | |
| 527 | + | |
| 528 | + r.type = r08(&b); | |
| 529 | + r.tag = r16(&b); | |
| 530 | + if(r.type != Rversion){ | |
| 531 | + if(r.tag >= C9maxtags){ | |
| 532 | + c->error("c9proc: invalid tag 0x%x", r.tag); | |
| 533 | + return C9Epkt; | |
| 534 | + } | |
| 535 | + if(freetag(c, r.tag) != 0) | |
| 536 | + return C9Etag; | |
| 537 | + } | |
| 538 | + sz -= 3; | |
| 539 | + r.numqid = 0; | |
| 540 | + | |
| 541 | + switch(r.type){ | |
| 542 | + case Rread: | |
| 543 | + if(sz < 4 || (cnt = r32(&b)) > sz-4) | |
| 544 | + goto error; | |
| 545 | + r.read.data = b; | |
| 546 | + r.read.size = cnt; | |
| 547 | + c->r(c, &r); | |
| 548 | + break; | |
| 549 | + | |
| 550 | + case Rwrite: | |
| 551 | + if(sz < 4 || (cnt = r32(&b)) > c->msize) | |
| 552 | + goto error; | |
| 553 | + r.write.size = cnt; | |
| 554 | + c->r(c, &r); | |
| 555 | + break; | |
| 556 | + | |
| 557 | + case Rwalk: | |
| 558 | + if(sz < 2+13 || (cnt = r16(&b))*13 > sz-2) | |
| 559 | + goto error; | |
| 560 | + if(cnt > C9maxpathel){ | |
| 561 | + c->error("c9proc: Rwalk !(%d <= %d)", cnt, C9maxpathel); | |
| 562 | + return C9Epath; | |
| 563 | + } | |
| 564 | + for(i = 0; i < cnt; i++){ | |
| 565 | + r.qid[i].type = r08(&b); | |
| 566 | + r.qid[i].version = r32(&b); | |
| 567 | + r.qid[i].path = r64(&b); | |
| 568 | + } | |
| 569 | + r.numqid = cnt; | |
| 570 | + c->r(c, &r); | |
| 571 | + break; | |
| 572 | + | |
| 573 | + case Rstat: | |
| 574 | + b += 2; sz -= 2; | |
| 575 | + if((err = c9parsedir(c, &r.stat, &b, &sz)) != 0){ | |
| 576 | + c->error("c9proc"); | |
| 577 | + return err; | |
| 578 | + } | |
| 579 | + r.numqid = 1; | |
| 580 | + c->r(c, &r); | |
| 581 | + break; | |
| 582 | + | |
| 583 | + case Rflush: | |
| 584 | + for(i = 0; i < C9maxflush; i++){ | |
| 585 | + if((c->flush[i] & 0xffff) == r.tag){ | |
| 586 | + freetag(c, c->flush[i]>>16); | |
| 587 | + c->flush[i] = 0xffffffff; | |
| 588 | + break; | |
| 589 | + } | |
| 590 | + } | |
| 591 | + /* fallthrough */ | |
| 592 | + case Rclunk: | |
| 593 | + case Rremove: | |
| 594 | + case Rwstat: | |
| 595 | + c->r(c, &r); | |
| 596 | + break; | |
| 597 | + | |
| 598 | + case Ropen: | |
| 599 | + case Rcreate: | |
| 600 | + if(sz < 17) | |
| 601 | + goto error; | |
| 602 | + r.qid[0].type = r08(&b); | |
| 603 | + r.qid[0].version = r32(&b); | |
| 604 | + r.qid[0].path = r64(&b); | |
| 605 | + r.iounit = r32(&b); | |
| 606 | + r.numqid = 1; | |
| 607 | + c->r(c, &r); | |
| 608 | + break; | |
| 609 | + | |
| 610 | + case Rerror: | |
| 611 | + if(sz < 2 || (cnt = r16(&b)) > sz-2) | |
| 612 | + goto error; | |
| 613 | + r.error = memmove(b-1, b, cnt); | |
| 614 | + r.error[cnt] = 0; | |
| 615 | + c->r(c, &r); | |
| 616 | + break; | |
| 617 | + | |
| 618 | + case Rauth: | |
| 619 | + case Rattach: | |
| 620 | + if(sz < 13) | |
| 621 | + goto error; | |
| 622 | + r.qid[0].type = r08(&b); | |
| 623 | + r.qid[0].version = r32(&b); | |
| 624 | + r.qid[0].path = r64(&b); | |
| 625 | + r.numqid = 1; | |
| 626 | + c->r(c, &r); | |
| 627 | + break; | |
| 628 | + | |
| 629 | + case Rversion: | |
| 630 | + if(sz < 4+2 || (msize = r32(&b)) < C9minmsize || (cnt = r16(&b)) > sz-4-2) | |
| 631 | + goto error; | |
| 632 | + if(cnt < 6 || memcmp(b, "9P2000", 6) != 0){ | |
| 633 | + c->error("invalid version"); | |
| 634 | + return C9Ever; | |
| 635 | + } | |
| 636 | + if(msize < c->msize) | |
| 637 | + c->msize = msize; | |
| 638 | + c->r(c, &r); | |
| 639 | + break; | |
| 640 | + | |
| 641 | + default: | |
| 642 | + goto error; | |
| 643 | + } | |
| 644 | + return 0; | |
| 645 | +error: | |
| 646 | + c->error("c9proc: invalid packet (type=%d)", r.type); | |
| 647 | + return C9Epkt; | |
| 648 | +} | |
| 649 | + | |
| 650 | +C9error | |
| 651 | +s9version(C9ctx *c) | |
| 652 | +{ | |
| 653 | + uint8_t *b; | |
| 654 | + C9error err; | |
| 655 | + | |
| 656 | + if((b = R(c, 4+2+6, Rversion, 0xffff, &err)) != NULL){ | |
| 657 | + w32(&b, c->msize); | |
| 658 | + wcs(&b, "9P2000", 6); | |
| 659 | + err = c->end(c); | |
| 660 | + }; | |
| 661 | + return err; | |
| 662 | +} | |
| 663 | + | |
| 664 | +C9error | |
| 665 | +s9auth(C9ctx *c, C9tag tag, const C9qid *aqid) | |
| 666 | +{ | |
| 667 | + uint8_t *b; | |
| 668 | + C9error err; | |
| 669 | + | |
| 670 | + if((b = R(c, 13, Rauth, tag, &err)) != NULL){ | |
| 671 | + w08(&b, aqid->type); | |
| 672 | + w32(&b, aqid->version); | |
| 673 | + w64(&b, aqid->path); | |
| 674 | + err = c->end(c); | |
| 675 | + } | |
| 676 | + return err; | |
| 677 | +} | |
| 678 | + | |
| 679 | +C9error | |
| 680 | +s9error(C9ctx *c, C9tag tag, const char *ename) | |
| 681 | +{ | |
| 682 | + uint32_t len = safestrlen(ename); | |
| 683 | + uint8_t *b; | |
| 684 | + C9error err; | |
| 685 | + | |
| 686 | + if(len > C9maxstr){ | |
| 687 | + c->error("s9error: invalid ename"); | |
| 688 | + return C9Estr; | |
| 689 | + } | |
| 690 | + if((b = R(c, 2+len, Rerror, tag, &err)) != NULL){ | |
| 691 | + wcs(&b, ename, len); | |
| 692 | + err = c->end(c); | |
| 693 | + } | |
| 694 | + return err; | |
| 695 | +} | |
| 696 | + | |
| 697 | +C9error | |
| 698 | +s9attach(C9ctx *c, C9tag tag, const C9qid *qid) | |
| 699 | +{ | |
| 700 | + uint8_t *b; | |
| 701 | + C9error err; | |
| 702 | + | |
| 703 | + if((b = R(c, 13, Rattach, tag, &err)) != NULL){ | |
| 704 | + w08(&b, qid->type); | |
| 705 | + w32(&b, qid->version); | |
| 706 | + w64(&b, qid->path); | |
| 707 | + err = c->end(c); | |
| 708 | + } | |
| 709 | + return err; | |
| 710 | +} | |
| 711 | + | |
| 712 | +C9error | |
| 713 | +s9flush(C9ctx *c, C9tag tag) | |
| 714 | +{ | |
| 715 | + uint8_t *b; | |
| 716 | + C9error err; | |
| 717 | + | |
| 718 | + if((b = R(c, 0, Rflush, tag, &err)) != NULL) | |
| 719 | + err = c->end(c); | |
| 720 | + return err; | |
| 721 | +} | |
| 722 | + | |
| 723 | +C9error | |
| 724 | +s9walk(C9ctx *c, C9tag tag, C9qid *qids[]) | |
| 725 | +{ | |
| 726 | + uint32_t i, n; | |
| 727 | + uint8_t *b; | |
| 728 | + C9error err; | |
| 729 | + | |
| 730 | + for(n = 0; n < C9maxpathel && qids[n] != NULL; n++); | |
| 731 | + if(n > C9maxpathel){ | |
| 732 | + c->error("s9walk: invalid elements !(0 <= %d <= %d)", n, C9maxpathel); | |
| 733 | + return C9Epath; | |
| 734 | + } | |
| 735 | + | |
| 736 | + if((b = R(c, 2+n*13, Rwalk, tag, &err)) != NULL){ | |
| 737 | + w16(&b, n); | |
| 738 | + for(i = 0; i < n; i++){ | |
| 739 | + w08(&b, qids[i]->type); | |
| 740 | + w32(&b, qids[i]->version); | |
| 741 | + w64(&b, qids[i]->path); | |
| 742 | + } | |
| 743 | + err = c->end(c); | |
| 744 | + } | |
| 745 | + return err; | |
| 746 | +} | |
| 747 | + | |
| 748 | +C9error | |
| 749 | +s9open(C9ctx *c, C9tag tag, const C9qid *qid, uint32_t iounit) | |
| 750 | +{ | |
| 751 | + uint8_t *b; | |
| 752 | + C9error err; | |
| 753 | + | |
| 754 | + if((b = R(c, 13+4, Ropen, tag, &err)) != NULL){ | |
| 755 | + w08(&b, qid->type); | |
| 756 | + w32(&b, qid->version); | |
| 757 | + w64(&b, qid->path); | |
| 758 | + w32(&b, iounit); | |
| 759 | + err = c->end(c); | |
| 760 | + } | |
| 761 | + return err; | |
| 762 | +} | |
| 763 | + | |
| 764 | +C9error | |
| 765 | +s9create(C9ctx *c, C9tag tag, const C9qid *qid, uint32_t iounit) | |
| 766 | +{ | |
| 767 | + uint8_t *b; | |
| 768 | + C9error err; | |
| 769 | + | |
| 770 | + if((b = R(c, 13+4, Rcreate, tag, &err)) != NULL){ | |
| 771 | + w08(&b, qid->type); | |
| 772 | + w32(&b, qid->version); | |
| 773 | + w64(&b, qid->path); | |
| 774 | + w32(&b, iounit); | |
| 775 | + err = c->end(c); | |
| 776 | + } | |
| 777 | + return err; | |
| 778 | +} | |
| 779 | + | |
| 780 | +C9error | |
| 781 | +s9read(C9ctx *c, C9tag tag, const void *data, uint32_t size) | |
| 782 | +{ | |
| 783 | + uint8_t *b; | |
| 784 | + C9error err; | |
| 785 | + | |
| 786 | + if((b = R(c, 4+size, Rread, tag, &err)) != NULL){ | |
| 787 | + w32(&b, size); | |
| 788 | + memmove(b, data, size); | |
| 789 | + err = c->end(c); | |
| 790 | + } | |
| 791 | + return err; | |
| 792 | +} | |
| 793 | + | |
| 794 | +C9error | |
| 795 | +s9write(C9ctx *c, C9tag tag, uint32_t size) | |
| 796 | +{ | |
| 797 | + uint8_t *b; | |
| 798 | + C9error err; | |
| 799 | + | |
| 800 | + if((b = R(c, 4, Rwrite, tag, &err)) != NULL){ | |
| 801 | + w32(&b, size); | |
| 802 | + err = c->end(c); | |
| 803 | + } | |
| 804 | + return err; | |
| 805 | +} | |
| 806 | + | |
| 807 | +C9error | |
| 808 | +s9readdir(C9ctx *c, C9tag tag, C9stat *st[], int *num, uint64_t *offset, uint32_t size) | |
| 809 | +{ | |
| 810 | + uint8_t *b; | |
| 811 | + const C9stat *s; | |
| 812 | + uint32_t nlen, ulen, glen, mulen, m, n; | |
| 813 | + C9error err; | |
| 814 | + int i; | |
| 815 | + | |
| 816 | + if(size > c->msize-4-1-2) | |
| 817 | + size = c->msize-4-1-2; | |
| 818 | + | |
| 819 | + m = 0; | |
| 820 | + for(i = 0; i < *num; i++){ | |
| 821 | + s = st[i]; | |
| 822 | + nlen = safestrlen(s->name); | |
| 823 | + ulen = safestrlen(s->uid); | |
| 824 | + glen = safestrlen(s->gid); | |
| 825 | + mulen = safestrlen(s->muid); | |
| 826 | + | |
| 827 | + if(nlen == 0 || nlen > C9maxstr){ | |
| 828 | + c->error("s9readdir: invalid name"); | |
| 829 | + return C9Epath; | |
| 830 | + } | |
| 831 | + if(ulen > C9maxstr || glen > C9maxstr || mulen > C9maxstr){ | |
| 832 | + c->error("s9readdir: string too long"); | |
| 833 | + return C9Estr; | |
| 834 | + } | |
| 835 | + | |
| 836 | + n = 2 + 2+4+13+4+4+4+8+2+nlen+2+ulen+2+glen+2+mulen; | |
| 837 | + if(4+m+n > size) | |
| 838 | + break; | |
| 839 | + m += n; | |
| 840 | + } | |
| 841 | + | |
| 842 | + if((b = R(c, 4+m, Rread, tag, &err)) != NULL){ | |
| 843 | + *num = i; | |
| 844 | + w32(&b, m); | |
| 845 | + for(i = 0; i < *num; i++){ | |
| 846 | + s = st[i]; | |
| 847 | + nlen = safestrlen(s->name); | |
| 848 | + ulen = safestrlen(s->uid); | |
| 849 | + glen = safestrlen(s->gid); | |
| 850 | + mulen = safestrlen(s->muid); | |
| 851 | + w16(&b, 2+4+13+4+4+4+8+2+nlen+2+ulen+2+glen+2+mulen); | |
| 852 | + w16(&b, 0xffff); /* type */ | |
| 853 | + w32(&b, 0xffffffff); /* dev */ | |
| 854 | + w08(&b, s->qid.type); | |
| 855 | + w32(&b, s->qid.version); | |
| 856 | + w64(&b, s->qid.path); | |
| 857 | + w32(&b, s->mode); | |
| 858 | + w32(&b, s->atime); | |
| 859 | + w32(&b, s->mtime); | |
| 860 | + w64(&b, s->size); | |
| 861 | + wcs(&b, s->name, nlen); | |
| 862 | + wcs(&b, s->uid, ulen); | |
| 863 | + wcs(&b, s->gid, glen); | |
| 864 | + wcs(&b, s->muid, mulen); | |
| 865 | + } | |
| 866 | + err = c->end(c); | |
| 867 | + if(err == 0) | |
| 868 | + *offset += m; | |
| 869 | + } | |
| 870 | + return err; | |
| 871 | +} | |
| 872 | + | |
| 873 | +C9error | |
| 874 | +s9clunk(C9ctx *c, C9tag tag) | |
| 875 | +{ | |
| 876 | + uint8_t *b; | |
| 877 | + C9error err; | |
| 878 | + | |
| 879 | + if((b = R(c, 0, Rclunk, tag, &err)) != NULL) | |
| 880 | + err = c->end(c); | |
| 881 | + return err; | |
| 882 | +} | |
| 883 | + | |
| 884 | +C9error | |
| 885 | +s9remove(C9ctx *c, C9tag tag) | |
| 886 | +{ | |
| 887 | + uint8_t *b; | |
| 888 | + C9error err; | |
| 889 | + | |
| 890 | + if((b = R(c, 0, Rremove, tag, &err)) != NULL) | |
| 891 | + err = c->end(c); | |
| 892 | + return err; | |
| 893 | +} | |
| 894 | + | |
| 895 | +C9error | |
| 896 | +s9stat(C9ctx *c, C9tag tag, const C9stat *s) | |
| 897 | +{ | |
| 898 | + uint32_t nlen = safestrlen(s->name), ulen = safestrlen(s->uid); | |
| 899 | + uint32_t glen = safestrlen(s->gid), mulen = safestrlen(s->name); | |
| 900 | + uint32_t statsz = 2+4+13+4+4+4+8+2+nlen+2+ulen+2+glen+2+mulen; | |
| 901 | + uint8_t *b; | |
| 902 | + C9error err; | |
| 903 | + | |
| 904 | + if(nlen == 0 || nlen > C9maxstr){ | |
| 905 | + c->error("s9stat: invalid name"); | |
| 906 | + return C9Epath; | |
| 907 | + } | |
| 908 | + if(ulen > C9maxstr || glen > C9maxstr || mulen > C9maxstr){ | |
| 909 | + c->error("s9stat: string too long"); | |
| 910 | + return C9Estr; | |
| 911 | + } | |
| 912 | + | |
| 913 | + if((b = R(c, 2+2+statsz, Rstat, tag, &err)) != NULL){ | |
| 914 | + w16(&b, statsz+2); | |
| 915 | + w16(&b, statsz); | |
| 916 | + w16(&b, 0xffff); /* type */ | |
| 917 | + w32(&b, 0xffffffff); /* dev */ | |
| 918 | + w08(&b, s->qid.type); | |
| 919 | + w32(&b, s->qid.version); | |
| 920 | + w64(&b, s->qid.path); | |
| 921 | + w32(&b, s->mode); | |
| 922 | + w32(&b, s->atime); | |
| 923 | + w32(&b, s->mtime); | |
| 924 | + w64(&b, s->size); | |
| 925 | + wcs(&b, s->name, nlen); | |
| 926 | + wcs(&b, s->uid, ulen); | |
| 927 | + wcs(&b, s->gid, glen); | |
| 928 | + wcs(&b, s->muid, mulen); | |
| 929 | + err = c->end(c); | |
| 930 | + } | |
| 931 | + return err; | |
| 932 | +} | |
| 933 | + | |
| 934 | +C9error | |
| 935 | +s9wstat(C9ctx *c, C9tag tag) | |
| 936 | +{ | |
| 937 | + uint8_t *b; | |
| 938 | + C9error err; | |
| 939 | + | |
| 940 | + if((b = R(c, 0, Rwstat, tag, &err)) != NULL) | |
| 941 | + err = c->end(c); | |
| 942 | + return err; | |
| 943 | +} | |
| 944 | + | |
| 945 | +C9error | |
| 946 | +s9proc(C9ctx *c) | |
| 947 | +{ | |
| 948 | + uint32_t i, sz, cnt, n, msize; | |
| 949 | + int readerr; | |
| 950 | + uint8_t *b; | |
| 951 | + C9error err; | |
| 952 | + C9t t; | |
| 953 | + | |
| 954 | + readerr = -1; | |
| 955 | + if((b = c->read(c, 4, &readerr)) == NULL){ | |
| 956 | + if(readerr != 0) | |
| 957 | + c->error("s9proc: short read"); | |
| 958 | + return readerr == 0 ? 0 : C9Epkt; | |
| 959 | + } | |
| 960 | + | |
| 961 | + sz = r32(&b); | |
| 962 | + if(sz < 7 || sz > c->msize){ | |
| 963 | + c->error("s9proc: invalid packet size !(7 <= %u <= %u)", sz, c->msize); | |
| 964 | + return C9Epkt; | |
| 965 | + } | |
| 966 | + sz -= 4; | |
| 967 | + readerr = -1; | |
| 968 | + if((b = c->read(c, sz, &readerr)) == NULL){ | |
| 969 | + if(readerr != 0) | |
| 970 | + c->error("s9proc: short read"); | |
| 971 | + return readerr == 0 ? 0 : C9Epkt; | |
| 972 | + } | |
| 973 | + | |
| 974 | + t.type = r08(&b); | |
| 975 | + t.tag = r16(&b); | |
| 976 | + sz -= 3; | |
| 977 | + | |
| 978 | + if((c->svflags & Svver) == 0 && t.type != Tversion){ | |
| 979 | + c->error("s9proc: expected Tversion, got %d", t.type); | |
| 980 | + return C9Epkt; | |
| 981 | + } | |
| 982 | + | |
| 983 | + switch(t.type){ | |
| 984 | + case Tread: | |
| 985 | + if(sz < 4+8+4) | |
| 986 | + goto error; | |
| 987 | + t.fid = r32(&b); | |
| 988 | + t.read.offset = r64(&b); | |
| 989 | + t.read.size = r32(&b); | |
| 990 | + if(t.read.size > maxread(c)) | |
| 991 | + t.read.size = maxread(c); | |
| 992 | + c->t(c, &t); | |
| 993 | + break; | |
| 994 | + | |
| 995 | + case Twrite: | |
| 996 | + if(sz < 4+8+4) | |
| 997 | + goto error; | |
| 998 | + t.fid = r32(&b); | |
| 999 | + t.write.offset = r64(&b); | |
| 1000 | + if((t.write.size = r32(&b)) < sz-4-8-4) | |
| 1001 | + goto error; | |
| 1002 | + if(t.write.size > maxwrite(c)) | |
| 1003 | + t.write.size = maxwrite(c); | |
| 1004 | + t.write.data = b; | |
| 1005 | + c->t(c, &t); | |
| 1006 | + break; | |
| 1007 | + | |
| 1008 | + case Tclunk: | |
| 1009 | + case Tstat: | |
| 1010 | + case Tremove: | |
| 1011 | + if(sz < 4) | |
| 1012 | + goto error; | |
| 1013 | + t.fid = r32(&b); | |
| 1014 | + c->t(c, &t); | |
| 1015 | + break; | |
| 1016 | + | |
| 1017 | + case Twalk: | |
| 1018 | + if(sz < 4+4+2) | |
| 1019 | + goto error; | |
| 1020 | + t.fid = r32(&b); | |
| 1021 | + t.walk.newfid = r32(&b); | |
| 1022 | + if((n = r16(&b)) > 16){ | |
| 1023 | + c->error("s9proc: Twalk !(%d <= 16)", n); | |
| 1024 | + return C9Epath; | |
| 1025 | + } | |
| 1026 | + sz -= 4+4+2; | |
| 1027 | + if(n > 0){ | |
| 1028 | + for(i = 0; i < n; i++){ | |
| 1029 | + if(sz < 2 || (cnt = r16(&b)) > sz-2) | |
| 1030 | + goto error; | |
| 1031 | + if(cnt < 1){ | |
| 1032 | + c->error("s9proc: Twalk invalid element [%d]", i); | |
| 1033 | + return C9Epath; | |
| 1034 | + } | |
| 1035 | + b[-2] = 0; | |
| 1036 | + t.walk.wname[i] = (char*)b; | |
| 1037 | + b += cnt; | |
| 1038 | + sz -= 2 + cnt; | |
| 1039 | + } | |
| 1040 | + memmove(t.walk.wname[i-1]-1, t.walk.wname[i-1], (char*)b - t.walk.wname[i-1]); | |
| 1041 | + t.walk.wname[i-1]--; | |
| 1042 | + b[-1] = 0; | |
| 1043 | + }else | |
| 1044 | + i = 0; | |
| 1045 | + t.walk.wname[i] = NULL; | |
| 1046 | + c->t(c, &t); | |
| 1047 | + break; | |
| 1048 | + | |
| 1049 | + case Topen: | |
| 1050 | + if(sz < 4+1) | |
| 1051 | + goto error; | |
| 1052 | + t.fid = r32(&b); | |
| 1053 | + t.open.mode = r08(&b); | |
| 1054 | + c->t(c, &t); | |
| 1055 | + break; | |
| 1056 | + | |
| 1057 | + case Twstat: | |
| 1058 | + if(sz < 4+2) | |
| 1059 | + goto error; | |
| 1060 | + t.fid = r32(&b); | |
| 1061 | + if((cnt = r16(&b)) > sz-4) | |
| 1062 | + goto error; | |
| 1063 | + if((err = c9parsedir(c, &t.wstat, &b, &cnt)) != 0){ | |
| 1064 | + c->error("s9proc"); | |
| 1065 | + return err; | |
| 1066 | + } | |
| 1067 | + c->t(c, &t); | |
| 1068 | + break; | |
| 1069 | + | |
| 1070 | + case Tcreate: | |
| 1071 | + if(sz < 4+2+4+1) | |
| 1072 | + goto error; | |
| 1073 | + t.fid = r32(&b); | |
| 1074 | + if((cnt = r16(&b)) < 1 || cnt > sz-4-2-4-1) | |
| 1075 | + goto error; | |
| 1076 | + t.create.name = (char*)b; | |
| 1077 | + b += cnt; | |
| 1078 | + t.create.perm = r32(&b); | |
| 1079 | + t.create.mode = r08(&b); | |
| 1080 | + t.create.name[cnt] = 0; | |
| 1081 | + c->t(c, &t); | |
| 1082 | + break; | |
| 1083 | + | |
| 1084 | + case Tflush: | |
| 1085 | + if(sz < 2) | |
| 1086 | + goto error; | |
| 1087 | + t.flush.oldtag = r16(&b); | |
| 1088 | + c->t(c, &t); | |
| 1089 | + break; | |
| 1090 | + | |
| 1091 | + case Tversion: | |
| 1092 | + if(sz < 4+2 || (msize = r32(&b)) < C9minmsize || (cnt = r16(&b)) > sz-4-2) | |
| 1093 | + goto error; | |
| 1094 | + if(cnt < 6 || memcmp(b, "9P2000", 6) != 0){ | |
| 1095 | + if((b = R(c, 4+2+7, Rversion, 0xffff, &err)) != NULL){ | |
| 1096 | + w32(&b, 0); | |
| 1097 | + wcs(&b, "unknown", 7); | |
| 1098 | + err = c->end(c); | |
| 1099 | + c->error("s9proc: invalid version"); | |
| 1100 | + } | |
| 1101 | + return C9Ever; | |
| 1102 | + } | |
| 1103 | + if(msize < c->msize) | |
| 1104 | + c->msize = msize; | |
| 1105 | + c->svflags |= Svver; | |
| 1106 | + c->t(c, &t); | |
| 1107 | + break; | |
| 1108 | + | |
| 1109 | + case Tattach: | |
| 1110 | + if(sz < 4+4+2+2) | |
| 1111 | + goto error; | |
| 1112 | + t.fid = r32(&b); | |
| 1113 | + t.attach.afid = r32(&b); | |
| 1114 | + cnt = r16(&b); | |
| 1115 | + sz -= 4+4+2; | |
| 1116 | + if(cnt+2 > sz) | |
| 1117 | + goto error; | |
| 1118 | + t.attach.uname = (char*)b; | |
| 1119 | + b += cnt; | |
| 1120 | + cnt = r16(&b); | |
| 1121 | + b[-2] = 0; | |
| 1122 | + sz -= cnt+2; | |
| 1123 | + if(cnt > sz) | |
| 1124 | + goto error; | |
| 1125 | + memmove(b-1, b, cnt); | |
| 1126 | + t.attach.aname = (char*)b-1; | |
| 1127 | + t.attach.aname[cnt] = 0; | |
| 1128 | + c->t(c, &t); | |
| 1129 | + break; | |
| 1130 | + | |
| 1131 | + case Tauth: | |
| 1132 | + if(sz < 4+2+2) | |
| 1133 | + goto error; | |
| 1134 | + t.auth.afid = r32(&b); | |
| 1135 | + cnt = r16(&b); | |
| 1136 | + sz -= 4+2; | |
| 1137 | + if(cnt+2 > sz) | |
| 1138 | + goto error; | |
| 1139 | + t.auth.uname = (char*)b; | |
| 1140 | + b += cnt; | |
| 1141 | + cnt = r16(&b); | |
| 1142 | + b[-2] = 0; | |
| 1143 | + sz -= cnt+2; | |
| 1144 | + if(cnt > sz) | |
| 1145 | + goto error; | |
| 1146 | + memmove(b-1, b, cnt); | |
| 1147 | + t.auth.aname = (char*)b-1; | |
| 1148 | + t.auth.aname[cnt] = 0; | |
| 1149 | + c->t(c, &t); | |
| 1150 | + break; | |
| 1151 | + | |
| 1152 | + default: | |
| 1153 | + goto error; | |
| 1154 | + } | |
| 1155 | + return 0; | |
| 1156 | +error: | |
| 1157 | + c->error("s9proc: invalid packet (type=%d)", t.type); | |
| 1158 | + return C9Epkt; | |
| 1159 | +} | |