| 1 | /* |
| 2 | * sftp.c: SFTP generic client code. |
| 3 | */ |
| 4 | |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | #include <string.h> |
| 8 | #include <assert.h> |
| 9 | #include <limits.h> |
| 10 | |
| 11 | #include "misc.h" |
| 12 | #include "int64.h" |
| 13 | #include "tree234.h" |
| 14 | #include "sftp.h" |
| 15 | |
| 16 | #define GET_32BIT(cp) \ |
| 17 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
| 18 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
| 19 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
| 20 | ((unsigned long)(unsigned char)(cp)[3])) |
| 21 | |
| 22 | #define PUT_32BIT(cp, value) { \ |
| 23 | (cp)[0] = (unsigned char)((value) >> 24); \ |
| 24 | (cp)[1] = (unsigned char)((value) >> 16); \ |
| 25 | (cp)[2] = (unsigned char)((value) >> 8); \ |
| 26 | (cp)[3] = (unsigned char)(value); } |
| 27 | |
| 28 | struct sftp_packet { |
| 29 | char *data; |
| 30 | int length, maxlen; |
| 31 | int savedpos; |
| 32 | int type; |
| 33 | }; |
| 34 | |
| 35 | static const char *fxp_error_message; |
| 36 | static int fxp_errtype; |
| 37 | |
| 38 | static void fxp_internal_error(char *msg); |
| 39 | |
| 40 | /* ---------------------------------------------------------------------- |
| 41 | * SFTP packet construction functions. |
| 42 | */ |
| 43 | static void sftp_pkt_ensure(struct sftp_packet *pkt, int length) |
| 44 | { |
| 45 | if (pkt->maxlen < length) { |
| 46 | pkt->maxlen = length + 256; |
| 47 | pkt->data = sresize(pkt->data, pkt->maxlen, char); |
| 48 | } |
| 49 | } |
| 50 | static void sftp_pkt_adddata(struct sftp_packet *pkt, void *data, int len) |
| 51 | { |
| 52 | pkt->length += len; |
| 53 | sftp_pkt_ensure(pkt, pkt->length); |
| 54 | memcpy(pkt->data + pkt->length - len, data, len); |
| 55 | } |
| 56 | static void sftp_pkt_addbyte(struct sftp_packet *pkt, unsigned char byte) |
| 57 | { |
| 58 | sftp_pkt_adddata(pkt, &byte, 1); |
| 59 | } |
| 60 | static struct sftp_packet *sftp_pkt_init(int pkt_type) |
| 61 | { |
| 62 | struct sftp_packet *pkt; |
| 63 | pkt = snew(struct sftp_packet); |
| 64 | pkt->data = NULL; |
| 65 | pkt->savedpos = -1; |
| 66 | pkt->length = 0; |
| 67 | pkt->maxlen = 0; |
| 68 | sftp_pkt_addbyte(pkt, (unsigned char) pkt_type); |
| 69 | return pkt; |
| 70 | } |
| 71 | /* |
| 72 | static void sftp_pkt_addbool(struct sftp_packet *pkt, unsigned char value) |
| 73 | { |
| 74 | sftp_pkt_adddata(pkt, &value, 1); |
| 75 | } |
| 76 | */ |
| 77 | static void sftp_pkt_adduint32(struct sftp_packet *pkt, |
| 78 | unsigned long value) |
| 79 | { |
| 80 | unsigned char x[4]; |
| 81 | PUT_32BIT(x, value); |
| 82 | sftp_pkt_adddata(pkt, x, 4); |
| 83 | } |
| 84 | static void sftp_pkt_adduint64(struct sftp_packet *pkt, uint64 value) |
| 85 | { |
| 86 | unsigned char x[8]; |
| 87 | PUT_32BIT(x, value.hi); |
| 88 | PUT_32BIT(x + 4, value.lo); |
| 89 | sftp_pkt_adddata(pkt, x, 8); |
| 90 | } |
| 91 | static void sftp_pkt_addstring_start(struct sftp_packet *pkt) |
| 92 | { |
| 93 | sftp_pkt_adduint32(pkt, 0); |
| 94 | pkt->savedpos = pkt->length; |
| 95 | } |
| 96 | static void sftp_pkt_addstring_str(struct sftp_packet *pkt, char *data) |
| 97 | { |
| 98 | sftp_pkt_adddata(pkt, data, strlen(data)); |
| 99 | PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos); |
| 100 | } |
| 101 | static void sftp_pkt_addstring_data(struct sftp_packet *pkt, |
| 102 | char *data, int len) |
| 103 | { |
| 104 | sftp_pkt_adddata(pkt, data, len); |
| 105 | PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos); |
| 106 | } |
| 107 | static void sftp_pkt_addstring(struct sftp_packet *pkt, char *data) |
| 108 | { |
| 109 | sftp_pkt_addstring_start(pkt); |
| 110 | sftp_pkt_addstring_str(pkt, data); |
| 111 | } |
| 112 | static void sftp_pkt_addattrs(struct sftp_packet *pkt, struct fxp_attrs attrs) |
| 113 | { |
| 114 | sftp_pkt_adduint32(pkt, attrs.flags); |
| 115 | if (attrs.flags & SSH_FILEXFER_ATTR_SIZE) { |
| 116 | sftp_pkt_adduint32(pkt, attrs.size.hi); |
| 117 | sftp_pkt_adduint32(pkt, attrs.size.lo); |
| 118 | } |
| 119 | if (attrs.flags & SSH_FILEXFER_ATTR_UIDGID) { |
| 120 | sftp_pkt_adduint32(pkt, attrs.uid); |
| 121 | sftp_pkt_adduint32(pkt, attrs.gid); |
| 122 | } |
| 123 | if (attrs.flags & SSH_FILEXFER_ATTR_PERMISSIONS) { |
| 124 | sftp_pkt_adduint32(pkt, attrs.permissions); |
| 125 | } |
| 126 | if (attrs.flags & SSH_FILEXFER_ATTR_ACMODTIME) { |
| 127 | sftp_pkt_adduint32(pkt, attrs.atime); |
| 128 | sftp_pkt_adduint32(pkt, attrs.mtime); |
| 129 | } |
| 130 | if (attrs.flags & SSH_FILEXFER_ATTR_EXTENDED) { |
| 131 | /* |
| 132 | * We currently don't support sending any extended |
| 133 | * attributes. |
| 134 | */ |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | /* ---------------------------------------------------------------------- |
| 139 | * SFTP packet decode functions. |
| 140 | */ |
| 141 | |
| 142 | static unsigned char sftp_pkt_getbyte(struct sftp_packet *pkt) |
| 143 | { |
| 144 | unsigned char value; |
| 145 | if (pkt->length - pkt->savedpos < 1) |
| 146 | return 0; /* arrgh, no way to decline (FIXME?) */ |
| 147 | value = (unsigned char) pkt->data[pkt->savedpos]; |
| 148 | pkt->savedpos++; |
| 149 | return value; |
| 150 | } |
| 151 | static unsigned long sftp_pkt_getuint32(struct sftp_packet *pkt) |
| 152 | { |
| 153 | unsigned long value; |
| 154 | if (pkt->length - pkt->savedpos < 4) |
| 155 | return 0; /* arrgh, no way to decline (FIXME?) */ |
| 156 | value = GET_32BIT(pkt->data + pkt->savedpos); |
| 157 | pkt->savedpos += 4; |
| 158 | return value; |
| 159 | } |
| 160 | static void sftp_pkt_getstring(struct sftp_packet *pkt, |
| 161 | char **p, int *length) |
| 162 | { |
| 163 | *p = NULL; |
| 164 | if (pkt->length - pkt->savedpos < 4) |
| 165 | return; |
| 166 | *length = GET_32BIT(pkt->data + pkt->savedpos); |
| 167 | pkt->savedpos += 4; |
| 168 | if (pkt->length - pkt->savedpos < *length) |
| 169 | return; |
| 170 | *p = pkt->data + pkt->savedpos; |
| 171 | pkt->savedpos += *length; |
| 172 | } |
| 173 | static struct fxp_attrs sftp_pkt_getattrs(struct sftp_packet *pkt) |
| 174 | { |
| 175 | struct fxp_attrs ret; |
| 176 | ret.flags = sftp_pkt_getuint32(pkt); |
| 177 | if (ret.flags & SSH_FILEXFER_ATTR_SIZE) { |
| 178 | unsigned long hi, lo; |
| 179 | hi = sftp_pkt_getuint32(pkt); |
| 180 | lo = sftp_pkt_getuint32(pkt); |
| 181 | ret.size = uint64_make(hi, lo); |
| 182 | } |
| 183 | if (ret.flags & SSH_FILEXFER_ATTR_UIDGID) { |
| 184 | ret.uid = sftp_pkt_getuint32(pkt); |
| 185 | ret.gid = sftp_pkt_getuint32(pkt); |
| 186 | } |
| 187 | if (ret.flags & SSH_FILEXFER_ATTR_PERMISSIONS) { |
| 188 | ret.permissions = sftp_pkt_getuint32(pkt); |
| 189 | } |
| 190 | if (ret.flags & SSH_FILEXFER_ATTR_ACMODTIME) { |
| 191 | ret.atime = sftp_pkt_getuint32(pkt); |
| 192 | ret.mtime = sftp_pkt_getuint32(pkt); |
| 193 | } |
| 194 | if (ret.flags & SSH_FILEXFER_ATTR_EXTENDED) { |
| 195 | int count; |
| 196 | count = sftp_pkt_getuint32(pkt); |
| 197 | while (count--) { |
| 198 | char *str; |
| 199 | int len; |
| 200 | /* |
| 201 | * We should try to analyse these, if we ever find one |
| 202 | * we recognise. |
| 203 | */ |
| 204 | sftp_pkt_getstring(pkt, &str, &len); |
| 205 | sftp_pkt_getstring(pkt, &str, &len); |
| 206 | } |
| 207 | } |
| 208 | return ret; |
| 209 | } |
| 210 | static void sftp_pkt_free(struct sftp_packet *pkt) |
| 211 | { |
| 212 | if (pkt->data) |
| 213 | sfree(pkt->data); |
| 214 | sfree(pkt); |
| 215 | } |
| 216 | |
| 217 | /* ---------------------------------------------------------------------- |
| 218 | * Send and receive packet functions. |
| 219 | */ |
| 220 | int sftp_send(struct sftp_packet *pkt) |
| 221 | { |
| 222 | int ret; |
| 223 | char x[4]; |
| 224 | PUT_32BIT(x, pkt->length); |
| 225 | ret = (sftp_senddata(x, 4) && sftp_senddata(pkt->data, pkt->length)); |
| 226 | sftp_pkt_free(pkt); |
| 227 | return ret; |
| 228 | } |
| 229 | struct sftp_packet *sftp_recv(void) |
| 230 | { |
| 231 | struct sftp_packet *pkt; |
| 232 | char x[4]; |
| 233 | |
| 234 | if (!sftp_recvdata(x, 4)) |
| 235 | return NULL; |
| 236 | |
| 237 | pkt = snew(struct sftp_packet); |
| 238 | pkt->savedpos = 0; |
| 239 | pkt->length = pkt->maxlen = GET_32BIT(x); |
| 240 | pkt->data = snewn(pkt->length, char); |
| 241 | |
| 242 | if (!sftp_recvdata(pkt->data, pkt->length)) { |
| 243 | sftp_pkt_free(pkt); |
| 244 | return NULL; |
| 245 | } |
| 246 | |
| 247 | pkt->type = sftp_pkt_getbyte(pkt); |
| 248 | |
| 249 | return pkt; |
| 250 | } |
| 251 | |
| 252 | /* ---------------------------------------------------------------------- |
| 253 | * Request ID allocation and temporary dispatch routines. |
| 254 | */ |
| 255 | |
| 256 | #define REQUEST_ID_OFFSET 256 |
| 257 | |
| 258 | struct sftp_request { |
| 259 | unsigned id; |
| 260 | int registered; |
| 261 | void *userdata; |
| 262 | }; |
| 263 | |
| 264 | static int sftp_reqcmp(void *av, void *bv) |
| 265 | { |
| 266 | struct sftp_request *a = (struct sftp_request *)av; |
| 267 | struct sftp_request *b = (struct sftp_request *)bv; |
| 268 | if (a->id < b->id) |
| 269 | return -1; |
| 270 | if (a->id > b->id) |
| 271 | return +1; |
| 272 | return 0; |
| 273 | } |
| 274 | static int sftp_reqfind(void *av, void *bv) |
| 275 | { |
| 276 | unsigned *a = (unsigned *) av; |
| 277 | struct sftp_request *b = (struct sftp_request *)bv; |
| 278 | if (*a < b->id) |
| 279 | return -1; |
| 280 | if (*a > b->id) |
| 281 | return +1; |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | static tree234 *sftp_requests; |
| 286 | |
| 287 | static struct sftp_request *sftp_alloc_request(void) |
| 288 | { |
| 289 | unsigned low, high, mid; |
| 290 | int tsize; |
| 291 | struct sftp_request *r; |
| 292 | |
| 293 | if (sftp_requests == NULL) |
| 294 | sftp_requests = newtree234(sftp_reqcmp); |
| 295 | |
| 296 | /* |
| 297 | * First-fit allocation of request IDs: always pick the lowest |
| 298 | * unused one. To do this, binary-search using the counted |
| 299 | * B-tree to find the largest ID which is in a contiguous |
| 300 | * sequence from the beginning. (Precisely everything in that |
| 301 | * sequence must have ID equal to its tree index plus |
| 302 | * REQUEST_ID_OFFSET.) |
| 303 | */ |
| 304 | tsize = count234(sftp_requests); |
| 305 | |
| 306 | low = -1; |
| 307 | high = tsize; |
| 308 | while (high - low > 1) { |
| 309 | mid = (high + low) / 2; |
| 310 | r = index234(sftp_requests, mid); |
| 311 | if (r->id == mid + REQUEST_ID_OFFSET) |
| 312 | low = mid; /* this one is fine */ |
| 313 | else |
| 314 | high = mid; /* this one is past it */ |
| 315 | } |
| 316 | /* |
| 317 | * Now low points to either -1, or the tree index of the |
| 318 | * largest ID in the initial sequence. |
| 319 | */ |
| 320 | { |
| 321 | unsigned i = low + 1 + REQUEST_ID_OFFSET; |
| 322 | assert(NULL == find234(sftp_requests, &i, sftp_reqfind)); |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * So the request ID we need to create is |
| 327 | * low + 1 + REQUEST_ID_OFFSET. |
| 328 | */ |
| 329 | r = snew(struct sftp_request); |
| 330 | r->id = low + 1 + REQUEST_ID_OFFSET; |
| 331 | r->registered = 0; |
| 332 | r->userdata = NULL; |
| 333 | add234(sftp_requests, r); |
| 334 | return r; |
| 335 | } |
| 336 | |
| 337 | void sftp_register(struct sftp_request *req) |
| 338 | { |
| 339 | req->registered = 1; |
| 340 | } |
| 341 | |
| 342 | struct sftp_request *sftp_find_request(struct sftp_packet *pktin) |
| 343 | { |
| 344 | unsigned long id; |
| 345 | struct sftp_request *req; |
| 346 | |
| 347 | if (!pktin) { |
| 348 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 349 | return NULL; |
| 350 | } |
| 351 | |
| 352 | id = sftp_pkt_getuint32(pktin); |
| 353 | req = find234(sftp_requests, &id, sftp_reqfind); |
| 354 | |
| 355 | if (!req || !req->registered) { |
| 356 | fxp_internal_error("request ID mismatch\n"); |
| 357 | sftp_pkt_free(pktin); |
| 358 | return NULL; |
| 359 | } |
| 360 | |
| 361 | del234(sftp_requests, req); |
| 362 | |
| 363 | return req; |
| 364 | } |
| 365 | |
| 366 | /* ---------------------------------------------------------------------- |
| 367 | * String handling routines. |
| 368 | */ |
| 369 | |
| 370 | static char *mkstr(char *s, int len) |
| 371 | { |
| 372 | char *p = snewn(len + 1, char); |
| 373 | memcpy(p, s, len); |
| 374 | p[len] = '\0'; |
| 375 | return p; |
| 376 | } |
| 377 | |
| 378 | /* ---------------------------------------------------------------------- |
| 379 | * SFTP primitives. |
| 380 | */ |
| 381 | |
| 382 | /* |
| 383 | * Deal with (and free) an FXP_STATUS packet. Return 1 if |
| 384 | * SSH_FX_OK, 0 if SSH_FX_EOF, and -1 for anything else (error). |
| 385 | * Also place the status into fxp_errtype. |
| 386 | */ |
| 387 | static int fxp_got_status(struct sftp_packet *pktin) |
| 388 | { |
| 389 | static const char *const messages[] = { |
| 390 | /* SSH_FX_OK. The only time we will display a _message_ for this |
| 391 | * is if we were expecting something other than FXP_STATUS on |
| 392 | * success, so this is actually an error message! */ |
| 393 | "unexpected OK response", |
| 394 | "end of file", |
| 395 | "no such file or directory", |
| 396 | "permission denied", |
| 397 | "failure", |
| 398 | "bad message", |
| 399 | "no connection", |
| 400 | "connection lost", |
| 401 | "operation unsupported", |
| 402 | }; |
| 403 | |
| 404 | if (pktin->type != SSH_FXP_STATUS) { |
| 405 | fxp_error_message = "expected FXP_STATUS packet"; |
| 406 | fxp_errtype = -1; |
| 407 | } else { |
| 408 | fxp_errtype = sftp_pkt_getuint32(pktin); |
| 409 | if (fxp_errtype < 0 || |
| 410 | fxp_errtype >= sizeof(messages) / sizeof(*messages)) |
| 411 | fxp_error_message = "unknown error code"; |
| 412 | else |
| 413 | fxp_error_message = messages[fxp_errtype]; |
| 414 | } |
| 415 | |
| 416 | if (fxp_errtype == SSH_FX_OK) |
| 417 | return 1; |
| 418 | else if (fxp_errtype == SSH_FX_EOF) |
| 419 | return 0; |
| 420 | else |
| 421 | return -1; |
| 422 | } |
| 423 | |
| 424 | static void fxp_internal_error(char *msg) |
| 425 | { |
| 426 | fxp_error_message = msg; |
| 427 | fxp_errtype = -1; |
| 428 | } |
| 429 | |
| 430 | const char *fxp_error(void) |
| 431 | { |
| 432 | return fxp_error_message; |
| 433 | } |
| 434 | |
| 435 | int fxp_error_type(void) |
| 436 | { |
| 437 | return fxp_errtype; |
| 438 | } |
| 439 | |
| 440 | /* |
| 441 | * Perform exchange of init/version packets. Return 0 on failure. |
| 442 | */ |
| 443 | int fxp_init(void) |
| 444 | { |
| 445 | struct sftp_packet *pktout, *pktin; |
| 446 | int remotever; |
| 447 | |
| 448 | pktout = sftp_pkt_init(SSH_FXP_INIT); |
| 449 | sftp_pkt_adduint32(pktout, SFTP_PROTO_VERSION); |
| 450 | sftp_send(pktout); |
| 451 | |
| 452 | pktin = sftp_recv(); |
| 453 | if (!pktin) { |
| 454 | fxp_internal_error("could not connect"); |
| 455 | return 0; |
| 456 | } |
| 457 | if (pktin->type != SSH_FXP_VERSION) { |
| 458 | fxp_internal_error("did not receive FXP_VERSION"); |
| 459 | sftp_pkt_free(pktin); |
| 460 | return 0; |
| 461 | } |
| 462 | remotever = sftp_pkt_getuint32(pktin); |
| 463 | if (remotever > SFTP_PROTO_VERSION) { |
| 464 | fxp_internal_error |
| 465 | ("remote protocol is more advanced than we support"); |
| 466 | sftp_pkt_free(pktin); |
| 467 | return 0; |
| 468 | } |
| 469 | /* |
| 470 | * In principle, this packet might also contain extension- |
| 471 | * string pairs. We should work through them and look for any |
| 472 | * we recognise. In practice we don't currently do so because |
| 473 | * we know we don't recognise _any_. |
| 474 | */ |
| 475 | sftp_pkt_free(pktin); |
| 476 | |
| 477 | return 1; |
| 478 | } |
| 479 | |
| 480 | /* |
| 481 | * Canonify a pathname. |
| 482 | */ |
| 483 | struct sftp_request *fxp_realpath_send(char *path) |
| 484 | { |
| 485 | struct sftp_request *req = sftp_alloc_request(); |
| 486 | struct sftp_packet *pktout; |
| 487 | |
| 488 | pktout = sftp_pkt_init(SSH_FXP_REALPATH); |
| 489 | sftp_pkt_adduint32(pktout, req->id); |
| 490 | sftp_pkt_addstring_start(pktout); |
| 491 | sftp_pkt_addstring_str(pktout, path); |
| 492 | sftp_send(pktout); |
| 493 | |
| 494 | return req; |
| 495 | } |
| 496 | |
| 497 | char *fxp_realpath_recv(struct sftp_packet *pktin, struct sftp_request *req) |
| 498 | { |
| 499 | sfree(req); |
| 500 | |
| 501 | if (pktin->type == SSH_FXP_NAME) { |
| 502 | int count; |
| 503 | char *path; |
| 504 | int len; |
| 505 | |
| 506 | count = sftp_pkt_getuint32(pktin); |
| 507 | if (count != 1) { |
| 508 | fxp_internal_error("REALPATH returned name count != 1\n"); |
| 509 | sftp_pkt_free(pktin); |
| 510 | return NULL; |
| 511 | } |
| 512 | sftp_pkt_getstring(pktin, &path, &len); |
| 513 | if (!path) { |
| 514 | fxp_internal_error("REALPATH returned malformed FXP_NAME\n"); |
| 515 | sftp_pkt_free(pktin); |
| 516 | return NULL; |
| 517 | } |
| 518 | path = mkstr(path, len); |
| 519 | sftp_pkt_free(pktin); |
| 520 | return path; |
| 521 | } else { |
| 522 | fxp_got_status(pktin); |
| 523 | sftp_pkt_free(pktin); |
| 524 | return NULL; |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | /* |
| 529 | * Open a file. |
| 530 | */ |
| 531 | struct sftp_request *fxp_open_send(char *path, int type) |
| 532 | { |
| 533 | struct sftp_request *req = sftp_alloc_request(); |
| 534 | struct sftp_packet *pktout; |
| 535 | |
| 536 | pktout = sftp_pkt_init(SSH_FXP_OPEN); |
| 537 | sftp_pkt_adduint32(pktout, req->id); |
| 538 | sftp_pkt_addstring(pktout, path); |
| 539 | sftp_pkt_adduint32(pktout, type); |
| 540 | sftp_pkt_adduint32(pktout, 0); /* (FIXME) empty ATTRS structure */ |
| 541 | sftp_send(pktout); |
| 542 | |
| 543 | return req; |
| 544 | } |
| 545 | |
| 546 | struct fxp_handle *fxp_open_recv(struct sftp_packet *pktin, |
| 547 | struct sftp_request *req) |
| 548 | { |
| 549 | sfree(req); |
| 550 | |
| 551 | if (pktin->type == SSH_FXP_HANDLE) { |
| 552 | char *hstring; |
| 553 | struct fxp_handle *handle; |
| 554 | int len; |
| 555 | |
| 556 | sftp_pkt_getstring(pktin, &hstring, &len); |
| 557 | if (!hstring) { |
| 558 | fxp_internal_error("OPEN returned malformed FXP_HANDLE\n"); |
| 559 | sftp_pkt_free(pktin); |
| 560 | return NULL; |
| 561 | } |
| 562 | handle = snew(struct fxp_handle); |
| 563 | handle->hstring = mkstr(hstring, len); |
| 564 | handle->hlen = len; |
| 565 | sftp_pkt_free(pktin); |
| 566 | return handle; |
| 567 | } else { |
| 568 | fxp_got_status(pktin); |
| 569 | sftp_pkt_free(pktin); |
| 570 | return NULL; |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * Open a directory. |
| 576 | */ |
| 577 | struct sftp_request *fxp_opendir_send(char *path) |
| 578 | { |
| 579 | struct sftp_request *req = sftp_alloc_request(); |
| 580 | struct sftp_packet *pktout; |
| 581 | |
| 582 | pktout = sftp_pkt_init(SSH_FXP_OPENDIR); |
| 583 | sftp_pkt_adduint32(pktout, req->id); |
| 584 | sftp_pkt_addstring(pktout, path); |
| 585 | sftp_send(pktout); |
| 586 | |
| 587 | return req; |
| 588 | } |
| 589 | |
| 590 | struct fxp_handle *fxp_opendir_recv(struct sftp_packet *pktin, |
| 591 | struct sftp_request *req) |
| 592 | { |
| 593 | sfree(req); |
| 594 | if (pktin->type == SSH_FXP_HANDLE) { |
| 595 | char *hstring; |
| 596 | struct fxp_handle *handle; |
| 597 | int len; |
| 598 | |
| 599 | sftp_pkt_getstring(pktin, &hstring, &len); |
| 600 | if (!hstring) { |
| 601 | fxp_internal_error("OPENDIR returned malformed FXP_HANDLE\n"); |
| 602 | sftp_pkt_free(pktin); |
| 603 | return NULL; |
| 604 | } |
| 605 | handle = snew(struct fxp_handle); |
| 606 | handle->hstring = mkstr(hstring, len); |
| 607 | handle->hlen = len; |
| 608 | sftp_pkt_free(pktin); |
| 609 | return handle; |
| 610 | } else { |
| 611 | fxp_got_status(pktin); |
| 612 | sftp_pkt_free(pktin); |
| 613 | return NULL; |
| 614 | } |
| 615 | } |
| 616 | |
| 617 | /* |
| 618 | * Close a file/dir. |
| 619 | */ |
| 620 | struct sftp_request *fxp_close_send(struct fxp_handle *handle) |
| 621 | { |
| 622 | struct sftp_request *req = sftp_alloc_request(); |
| 623 | struct sftp_packet *pktout; |
| 624 | |
| 625 | pktout = sftp_pkt_init(SSH_FXP_CLOSE); |
| 626 | sftp_pkt_adduint32(pktout, req->id); |
| 627 | sftp_pkt_addstring_start(pktout); |
| 628 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 629 | sftp_send(pktout); |
| 630 | |
| 631 | sfree(handle->hstring); |
| 632 | sfree(handle); |
| 633 | |
| 634 | return req; |
| 635 | } |
| 636 | |
| 637 | void fxp_close_recv(struct sftp_packet *pktin, struct sftp_request *req) |
| 638 | { |
| 639 | sfree(req); |
| 640 | fxp_got_status(pktin); |
| 641 | sftp_pkt_free(pktin); |
| 642 | } |
| 643 | |
| 644 | struct sftp_request *fxp_mkdir_send(char *path) |
| 645 | { |
| 646 | struct sftp_request *req = sftp_alloc_request(); |
| 647 | struct sftp_packet *pktout; |
| 648 | |
| 649 | pktout = sftp_pkt_init(SSH_FXP_MKDIR); |
| 650 | sftp_pkt_adduint32(pktout, req->id); |
| 651 | sftp_pkt_addstring(pktout, path); |
| 652 | sftp_pkt_adduint32(pktout, 0); /* (FIXME) empty ATTRS structure */ |
| 653 | sftp_send(pktout); |
| 654 | |
| 655 | return req; |
| 656 | } |
| 657 | |
| 658 | int fxp_mkdir_recv(struct sftp_packet *pktin, struct sftp_request *req) |
| 659 | { |
| 660 | int id; |
| 661 | sfree(req); |
| 662 | id = fxp_got_status(pktin); |
| 663 | sftp_pkt_free(pktin); |
| 664 | if (id != 1) { |
| 665 | return 0; |
| 666 | } |
| 667 | return 1; |
| 668 | } |
| 669 | |
| 670 | struct sftp_request *fxp_rmdir_send(char *path) |
| 671 | { |
| 672 | struct sftp_request *req = sftp_alloc_request(); |
| 673 | struct sftp_packet *pktout; |
| 674 | |
| 675 | pktout = sftp_pkt_init(SSH_FXP_RMDIR); |
| 676 | sftp_pkt_adduint32(pktout, req->id); |
| 677 | sftp_pkt_addstring(pktout, path); |
| 678 | sftp_send(pktout); |
| 679 | |
| 680 | return req; |
| 681 | } |
| 682 | |
| 683 | int fxp_rmdir_recv(struct sftp_packet *pktin, struct sftp_request *req) |
| 684 | { |
| 685 | int id; |
| 686 | sfree(req); |
| 687 | id = fxp_got_status(pktin); |
| 688 | sftp_pkt_free(pktin); |
| 689 | if (id != 1) { |
| 690 | return 0; |
| 691 | } |
| 692 | return 1; |
| 693 | } |
| 694 | |
| 695 | struct sftp_request *fxp_remove_send(char *fname) |
| 696 | { |
| 697 | struct sftp_request *req = sftp_alloc_request(); |
| 698 | struct sftp_packet *pktout; |
| 699 | |
| 700 | pktout = sftp_pkt_init(SSH_FXP_REMOVE); |
| 701 | sftp_pkt_adduint32(pktout, req->id); |
| 702 | sftp_pkt_addstring(pktout, fname); |
| 703 | sftp_send(pktout); |
| 704 | |
| 705 | return req; |
| 706 | } |
| 707 | |
| 708 | int fxp_remove_recv(struct sftp_packet *pktin, struct sftp_request *req) |
| 709 | { |
| 710 | int id; |
| 711 | sfree(req); |
| 712 | id = fxp_got_status(pktin); |
| 713 | sftp_pkt_free(pktin); |
| 714 | if (id != 1) { |
| 715 | return 0; |
| 716 | } |
| 717 | return 1; |
| 718 | } |
| 719 | |
| 720 | struct sftp_request *fxp_rename_send(char *srcfname, char *dstfname) |
| 721 | { |
| 722 | struct sftp_request *req = sftp_alloc_request(); |
| 723 | struct sftp_packet *pktout; |
| 724 | |
| 725 | pktout = sftp_pkt_init(SSH_FXP_RENAME); |
| 726 | sftp_pkt_adduint32(pktout, req->id); |
| 727 | sftp_pkt_addstring(pktout, srcfname); |
| 728 | sftp_pkt_addstring(pktout, dstfname); |
| 729 | sftp_send(pktout); |
| 730 | |
| 731 | return req; |
| 732 | } |
| 733 | |
| 734 | int fxp_rename_recv(struct sftp_packet *pktin, struct sftp_request *req) |
| 735 | { |
| 736 | int id; |
| 737 | sfree(req); |
| 738 | id = fxp_got_status(pktin); |
| 739 | sftp_pkt_free(pktin); |
| 740 | if (id != 1) { |
| 741 | return 0; |
| 742 | } |
| 743 | return 1; |
| 744 | } |
| 745 | |
| 746 | /* |
| 747 | * Retrieve the attributes of a file. We have fxp_stat which works |
| 748 | * on filenames, and fxp_fstat which works on open file handles. |
| 749 | */ |
| 750 | struct sftp_request *fxp_stat_send(char *fname) |
| 751 | { |
| 752 | struct sftp_request *req = sftp_alloc_request(); |
| 753 | struct sftp_packet *pktout; |
| 754 | |
| 755 | pktout = sftp_pkt_init(SSH_FXP_STAT); |
| 756 | sftp_pkt_adduint32(pktout, req->id); |
| 757 | sftp_pkt_addstring(pktout, fname); |
| 758 | sftp_send(pktout); |
| 759 | |
| 760 | return req; |
| 761 | } |
| 762 | |
| 763 | int fxp_stat_recv(struct sftp_packet *pktin, struct sftp_request *req, |
| 764 | struct fxp_attrs *attrs) |
| 765 | { |
| 766 | sfree(req); |
| 767 | if (pktin->type == SSH_FXP_ATTRS) { |
| 768 | *attrs = sftp_pkt_getattrs(pktin); |
| 769 | sftp_pkt_free(pktin); |
| 770 | return 1; |
| 771 | } else { |
| 772 | fxp_got_status(pktin); |
| 773 | sftp_pkt_free(pktin); |
| 774 | return 0; |
| 775 | } |
| 776 | } |
| 777 | |
| 778 | struct sftp_request *fxp_fstat_send(struct fxp_handle *handle) |
| 779 | { |
| 780 | struct sftp_request *req = sftp_alloc_request(); |
| 781 | struct sftp_packet *pktout; |
| 782 | |
| 783 | pktout = sftp_pkt_init(SSH_FXP_FSTAT); |
| 784 | sftp_pkt_adduint32(pktout, req->id); |
| 785 | sftp_pkt_addstring_start(pktout); |
| 786 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 787 | sftp_send(pktout); |
| 788 | |
| 789 | return req; |
| 790 | } |
| 791 | |
| 792 | int fxp_fstat_recv(struct sftp_packet *pktin, struct sftp_request *req, |
| 793 | struct fxp_attrs *attrs) |
| 794 | { |
| 795 | sfree(req); |
| 796 | if (pktin->type == SSH_FXP_ATTRS) { |
| 797 | *attrs = sftp_pkt_getattrs(pktin); |
| 798 | sftp_pkt_free(pktin); |
| 799 | return 1; |
| 800 | } else { |
| 801 | fxp_got_status(pktin); |
| 802 | sftp_pkt_free(pktin); |
| 803 | return 0; |
| 804 | } |
| 805 | } |
| 806 | |
| 807 | /* |
| 808 | * Set the attributes of a file. |
| 809 | */ |
| 810 | struct sftp_request *fxp_setstat_send(char *fname, struct fxp_attrs attrs) |
| 811 | { |
| 812 | struct sftp_request *req = sftp_alloc_request(); |
| 813 | struct sftp_packet *pktout; |
| 814 | |
| 815 | pktout = sftp_pkt_init(SSH_FXP_SETSTAT); |
| 816 | sftp_pkt_adduint32(pktout, req->id); |
| 817 | sftp_pkt_addstring(pktout, fname); |
| 818 | sftp_pkt_addattrs(pktout, attrs); |
| 819 | sftp_send(pktout); |
| 820 | |
| 821 | return req; |
| 822 | } |
| 823 | |
| 824 | int fxp_setstat_recv(struct sftp_packet *pktin, struct sftp_request *req) |
| 825 | { |
| 826 | int id; |
| 827 | sfree(req); |
| 828 | id = fxp_got_status(pktin); |
| 829 | sftp_pkt_free(pktin); |
| 830 | if (id != 1) { |
| 831 | return 0; |
| 832 | } |
| 833 | return 1; |
| 834 | } |
| 835 | |
| 836 | struct sftp_request *fxp_fsetstat_send(struct fxp_handle *handle, |
| 837 | struct fxp_attrs attrs) |
| 838 | { |
| 839 | struct sftp_request *req = sftp_alloc_request(); |
| 840 | struct sftp_packet *pktout; |
| 841 | |
| 842 | pktout = sftp_pkt_init(SSH_FXP_FSETSTAT); |
| 843 | sftp_pkt_adduint32(pktout, req->id); |
| 844 | sftp_pkt_addstring_start(pktout); |
| 845 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 846 | sftp_pkt_addattrs(pktout, attrs); |
| 847 | sftp_send(pktout); |
| 848 | |
| 849 | return req; |
| 850 | } |
| 851 | |
| 852 | int fxp_fsetstat_recv(struct sftp_packet *pktin, struct sftp_request *req) |
| 853 | { |
| 854 | int id; |
| 855 | sfree(req); |
| 856 | id = fxp_got_status(pktin); |
| 857 | sftp_pkt_free(pktin); |
| 858 | if (id != 1) { |
| 859 | return 0; |
| 860 | } |
| 861 | return 1; |
| 862 | } |
| 863 | |
| 864 | /* |
| 865 | * Read from a file. Returns the number of bytes read, or -1 on an |
| 866 | * error, or possibly 0 if EOF. (I'm not entirely sure whether it |
| 867 | * will return 0 on EOF, or return -1 and store SSH_FX_EOF in the |
| 868 | * error indicator. It might even depend on the SFTP server.) |
| 869 | */ |
| 870 | struct sftp_request *fxp_read_send(struct fxp_handle *handle, |
| 871 | uint64 offset, int len) |
| 872 | { |
| 873 | struct sftp_request *req = sftp_alloc_request(); |
| 874 | struct sftp_packet *pktout; |
| 875 | |
| 876 | pktout = sftp_pkt_init(SSH_FXP_READ); |
| 877 | sftp_pkt_adduint32(pktout, req->id); |
| 878 | sftp_pkt_addstring_start(pktout); |
| 879 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 880 | sftp_pkt_adduint64(pktout, offset); |
| 881 | sftp_pkt_adduint32(pktout, len); |
| 882 | sftp_send(pktout); |
| 883 | |
| 884 | return req; |
| 885 | } |
| 886 | |
| 887 | int fxp_read_recv(struct sftp_packet *pktin, struct sftp_request *req, |
| 888 | char *buffer, int len) |
| 889 | { |
| 890 | sfree(req); |
| 891 | if (pktin->type == SSH_FXP_DATA) { |
| 892 | char *str; |
| 893 | int rlen; |
| 894 | |
| 895 | sftp_pkt_getstring(pktin, &str, &rlen); |
| 896 | |
| 897 | if (rlen > len || rlen < 0) { |
| 898 | fxp_internal_error("READ returned more bytes than requested"); |
| 899 | sftp_pkt_free(pktin); |
| 900 | return -1; |
| 901 | } |
| 902 | |
| 903 | memcpy(buffer, str, rlen); |
| 904 | sftp_pkt_free(pktin); |
| 905 | return rlen; |
| 906 | } else { |
| 907 | fxp_got_status(pktin); |
| 908 | sftp_pkt_free(pktin); |
| 909 | return -1; |
| 910 | } |
| 911 | } |
| 912 | |
| 913 | /* |
| 914 | * Read from a directory. |
| 915 | */ |
| 916 | struct sftp_request *fxp_readdir_send(struct fxp_handle *handle) |
| 917 | { |
| 918 | struct sftp_request *req = sftp_alloc_request(); |
| 919 | struct sftp_packet *pktout; |
| 920 | |
| 921 | pktout = sftp_pkt_init(SSH_FXP_READDIR); |
| 922 | sftp_pkt_adduint32(pktout, req->id); |
| 923 | sftp_pkt_addstring_start(pktout); |
| 924 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 925 | sftp_send(pktout); |
| 926 | |
| 927 | return req; |
| 928 | } |
| 929 | |
| 930 | struct fxp_names *fxp_readdir_recv(struct sftp_packet *pktin, |
| 931 | struct sftp_request *req) |
| 932 | { |
| 933 | sfree(req); |
| 934 | if (pktin->type == SSH_FXP_NAME) { |
| 935 | struct fxp_names *ret; |
| 936 | int i; |
| 937 | ret = snew(struct fxp_names); |
| 938 | ret->nnames = sftp_pkt_getuint32(pktin); |
| 939 | ret->names = snewn(ret->nnames, struct fxp_name); |
| 940 | for (i = 0; i < ret->nnames; i++) { |
| 941 | char *str; |
| 942 | int len; |
| 943 | sftp_pkt_getstring(pktin, &str, &len); |
| 944 | ret->names[i].filename = mkstr(str, len); |
| 945 | sftp_pkt_getstring(pktin, &str, &len); |
| 946 | ret->names[i].longname = mkstr(str, len); |
| 947 | ret->names[i].attrs = sftp_pkt_getattrs(pktin); |
| 948 | } |
| 949 | sftp_pkt_free(pktin); |
| 950 | return ret; |
| 951 | } else { |
| 952 | fxp_got_status(pktin); |
| 953 | sftp_pkt_free(pktin); |
| 954 | return NULL; |
| 955 | } |
| 956 | } |
| 957 | |
| 958 | /* |
| 959 | * Write to a file. Returns 0 on error, 1 on OK. |
| 960 | */ |
| 961 | struct sftp_request *fxp_write_send(struct fxp_handle *handle, |
| 962 | char *buffer, uint64 offset, int len) |
| 963 | { |
| 964 | struct sftp_request *req = sftp_alloc_request(); |
| 965 | struct sftp_packet *pktout; |
| 966 | |
| 967 | pktout = sftp_pkt_init(SSH_FXP_WRITE); |
| 968 | sftp_pkt_adduint32(pktout, req->id); |
| 969 | sftp_pkt_addstring_start(pktout); |
| 970 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 971 | sftp_pkt_adduint64(pktout, offset); |
| 972 | sftp_pkt_addstring_start(pktout); |
| 973 | sftp_pkt_addstring_data(pktout, buffer, len); |
| 974 | sftp_send(pktout); |
| 975 | |
| 976 | return req; |
| 977 | } |
| 978 | |
| 979 | int fxp_write_recv(struct sftp_packet *pktin, struct sftp_request *req) |
| 980 | { |
| 981 | sfree(req); |
| 982 | fxp_got_status(pktin); |
| 983 | sftp_pkt_free(pktin); |
| 984 | return fxp_errtype == SSH_FX_OK; |
| 985 | } |
| 986 | |
| 987 | /* |
| 988 | * Free up an fxp_names structure. |
| 989 | */ |
| 990 | void fxp_free_names(struct fxp_names *names) |
| 991 | { |
| 992 | int i; |
| 993 | |
| 994 | for (i = 0; i < names->nnames; i++) { |
| 995 | sfree(names->names[i].filename); |
| 996 | sfree(names->names[i].longname); |
| 997 | } |
| 998 | sfree(names->names); |
| 999 | sfree(names); |
| 1000 | } |
| 1001 | |
| 1002 | /* |
| 1003 | * Duplicate an fxp_name structure. |
| 1004 | */ |
| 1005 | struct fxp_name *fxp_dup_name(struct fxp_name *name) |
| 1006 | { |
| 1007 | struct fxp_name *ret; |
| 1008 | ret = snew(struct fxp_name); |
| 1009 | ret->filename = dupstr(name->filename); |
| 1010 | ret->longname = dupstr(name->longname); |
| 1011 | ret->attrs = name->attrs; /* structure copy */ |
| 1012 | return ret; |
| 1013 | } |
| 1014 | |
| 1015 | /* |
| 1016 | * Free up an fxp_name structure. |
| 1017 | */ |
| 1018 | void fxp_free_name(struct fxp_name *name) |
| 1019 | { |
| 1020 | sfree(name->filename); |
| 1021 | sfree(name->longname); |
| 1022 | sfree(name); |
| 1023 | } |
| 1024 | |
| 1025 | /* |
| 1026 | * Store user data in an sftp_request structure. |
| 1027 | */ |
| 1028 | void *fxp_get_userdata(struct sftp_request *req) |
| 1029 | { |
| 1030 | return req->userdata; |
| 1031 | } |
| 1032 | |
| 1033 | void fxp_set_userdata(struct sftp_request *req, void *data) |
| 1034 | { |
| 1035 | req->userdata = data; |
| 1036 | } |
| 1037 | |
| 1038 | /* |
| 1039 | * A wrapper to go round fxp_read_* and fxp_write_*, which manages |
| 1040 | * the queueing of multiple read/write requests. |
| 1041 | */ |
| 1042 | |
| 1043 | struct req { |
| 1044 | char *buffer; |
| 1045 | int len, retlen, complete; |
| 1046 | uint64 offset; |
| 1047 | struct req *next, *prev; |
| 1048 | }; |
| 1049 | |
| 1050 | struct fxp_xfer { |
| 1051 | uint64 offset, furthestdata, filesize; |
| 1052 | int req_totalsize, req_maxsize, eof, err; |
| 1053 | struct fxp_handle *fh; |
| 1054 | struct req *head, *tail; |
| 1055 | }; |
| 1056 | |
| 1057 | static struct fxp_xfer *xfer_init(struct fxp_handle *fh, uint64 offset) |
| 1058 | { |
| 1059 | struct fxp_xfer *xfer = snew(struct fxp_xfer); |
| 1060 | |
| 1061 | xfer->fh = fh; |
| 1062 | xfer->offset = offset; |
| 1063 | xfer->head = xfer->tail = NULL; |
| 1064 | xfer->req_totalsize = 0; |
| 1065 | xfer->req_maxsize = 16384; |
| 1066 | xfer->err = 0; |
| 1067 | xfer->filesize = uint64_make(ULONG_MAX, ULONG_MAX); |
| 1068 | xfer->furthestdata = uint64_make(0, 0); |
| 1069 | |
| 1070 | return xfer; |
| 1071 | } |
| 1072 | |
| 1073 | int xfer_done(struct fxp_xfer *xfer) |
| 1074 | { |
| 1075 | /* |
| 1076 | * We're finished if we've seen EOF _and_ there are no |
| 1077 | * outstanding requests. |
| 1078 | */ |
| 1079 | return (xfer->eof || xfer->err) && !xfer->head; |
| 1080 | } |
| 1081 | |
| 1082 | void xfer_download_queue(struct fxp_xfer *xfer) |
| 1083 | { |
| 1084 | while (xfer->req_totalsize < xfer->req_maxsize && !xfer->eof) { |
| 1085 | /* |
| 1086 | * Queue a new read request. |
| 1087 | */ |
| 1088 | struct req *rr; |
| 1089 | struct sftp_request *req; |
| 1090 | |
| 1091 | rr = snew(struct req); |
| 1092 | rr->offset = xfer->offset; |
| 1093 | rr->complete = 0; |
| 1094 | if (xfer->tail) { |
| 1095 | xfer->tail->next = rr; |
| 1096 | rr->prev = xfer->tail; |
| 1097 | } else { |
| 1098 | xfer->head = rr; |
| 1099 | rr->prev = NULL; |
| 1100 | } |
| 1101 | xfer->tail = rr; |
| 1102 | rr->next = NULL; |
| 1103 | |
| 1104 | rr->len = 4096; |
| 1105 | rr->buffer = snewn(rr->len, char); |
| 1106 | sftp_register(req = fxp_read_send(xfer->fh, rr->offset, rr->len)); |
| 1107 | fxp_set_userdata(req, rr); |
| 1108 | |
| 1109 | xfer->offset = uint64_add32(xfer->offset, rr->len); |
| 1110 | xfer->req_totalsize += rr->len; |
| 1111 | |
| 1112 | #ifdef DEBUG_DOWNLOAD |
| 1113 | { char buf[40]; uint64_decimal(rr->offset, buf); printf("queueing read request %p at %s\n", rr, buf); } |
| 1114 | #endif |
| 1115 | } |
| 1116 | } |
| 1117 | |
| 1118 | struct fxp_xfer *xfer_download_init(struct fxp_handle *fh, uint64 offset) |
| 1119 | { |
| 1120 | struct fxp_xfer *xfer = xfer_init(fh, offset); |
| 1121 | |
| 1122 | xfer->eof = FALSE; |
| 1123 | xfer_download_queue(xfer); |
| 1124 | |
| 1125 | return xfer; |
| 1126 | } |
| 1127 | |
| 1128 | int xfer_download_gotpkt(struct fxp_xfer *xfer, struct sftp_packet *pktin) |
| 1129 | { |
| 1130 | struct sftp_request *rreq; |
| 1131 | struct req *rr; |
| 1132 | |
| 1133 | rreq = sftp_find_request(pktin); |
| 1134 | rr = (struct req *)fxp_get_userdata(rreq); |
| 1135 | if (!rr) |
| 1136 | return 0; /* this packet isn't ours */ |
| 1137 | rr->retlen = fxp_read_recv(pktin, rreq, rr->buffer, rr->len); |
| 1138 | #ifdef DEBUG_DOWNLOAD |
| 1139 | printf("read request %p has returned [%d]\n", rr, rr->retlen); |
| 1140 | #endif |
| 1141 | |
| 1142 | if ((rr->retlen < 0 && fxp_error_type()==SSH_FX_EOF) || rr->retlen == 0) { |
| 1143 | xfer->eof = TRUE; |
| 1144 | rr->complete = -1; |
| 1145 | #ifdef DEBUG_DOWNLOAD |
| 1146 | printf("setting eof\n"); |
| 1147 | #endif |
| 1148 | } else if (rr->retlen < 0) { |
| 1149 | /* some error other than EOF; signal it back to caller */ |
| 1150 | return -1; |
| 1151 | } |
| 1152 | |
| 1153 | rr->complete = 1; |
| 1154 | |
| 1155 | /* |
| 1156 | * Special case: if we have received fewer bytes than we |
| 1157 | * actually read, we should do something. For the moment I'll |
| 1158 | * just throw an ersatz FXP error to signal this; the SFTP |
| 1159 | * draft I've got says that it can't happen except on special |
| 1160 | * files, in which case seeking probably has very little |
| 1161 | * meaning and so queueing an additional read request to fill |
| 1162 | * up the gap sounds like the wrong answer. I'm not sure what I |
| 1163 | * should be doing here - if it _was_ a special file, I suspect |
| 1164 | * I simply shouldn't have been queueing multiple requests in |
| 1165 | * the first place... |
| 1166 | */ |
| 1167 | if (rr->retlen > 0 && uint64_compare(xfer->furthestdata, rr->offset) < 0) { |
| 1168 | xfer->furthestdata = rr->offset; |
| 1169 | #ifdef DEBUG_DOWNLOAD |
| 1170 | { char buf[40]; |
| 1171 | uint64_decimal(xfer->furthestdata, buf); |
| 1172 | printf("setting furthestdata = %s\n", buf); } |
| 1173 | #endif |
| 1174 | } |
| 1175 | |
| 1176 | if (rr->retlen < rr->len) { |
| 1177 | uint64 filesize = uint64_add32(rr->offset, |
| 1178 | (rr->retlen < 0 ? 0 : rr->retlen)); |
| 1179 | #ifdef DEBUG_DOWNLOAD |
| 1180 | { char buf[40]; |
| 1181 | uint64_decimal(filesize, buf); |
| 1182 | printf("short block! trying filesize = %s\n", buf); } |
| 1183 | #endif |
| 1184 | if (uint64_compare(xfer->filesize, filesize) > 0) { |
| 1185 | xfer->filesize = filesize; |
| 1186 | #ifdef DEBUG_DOWNLOAD |
| 1187 | printf("actually changing filesize\n"); |
| 1188 | #endif |
| 1189 | } |
| 1190 | } |
| 1191 | |
| 1192 | if (uint64_compare(xfer->furthestdata, xfer->filesize) > 0) { |
| 1193 | fxp_error_message = "received a short buffer from FXP_READ, but not" |
| 1194 | " at EOF"; |
| 1195 | fxp_errtype = -1; |
| 1196 | xfer_set_error(xfer); |
| 1197 | return -1; |
| 1198 | } |
| 1199 | |
| 1200 | return 1; |
| 1201 | } |
| 1202 | |
| 1203 | void xfer_set_error(struct fxp_xfer *xfer) |
| 1204 | { |
| 1205 | xfer->err = 1; |
| 1206 | } |
| 1207 | |
| 1208 | int xfer_download_data(struct fxp_xfer *xfer, void **buf, int *len) |
| 1209 | { |
| 1210 | void *retbuf = NULL; |
| 1211 | int retlen = 0; |
| 1212 | |
| 1213 | /* |
| 1214 | * Discard anything at the head of the rr queue with complete < |
| 1215 | * 0; return the first thing with complete > 0. |
| 1216 | */ |
| 1217 | while (xfer->head && xfer->head->complete && !retbuf) { |
| 1218 | struct req *rr = xfer->head; |
| 1219 | |
| 1220 | if (rr->complete > 0) { |
| 1221 | retbuf = rr->buffer; |
| 1222 | retlen = rr->retlen; |
| 1223 | #ifdef DEBUG_DOWNLOAD |
| 1224 | printf("handing back data from read request %p\n", rr); |
| 1225 | #endif |
| 1226 | } |
| 1227 | #ifdef DEBUG_DOWNLOAD |
| 1228 | else |
| 1229 | printf("skipping failed read request %p\n", rr); |
| 1230 | #endif |
| 1231 | |
| 1232 | xfer->head = xfer->head->next; |
| 1233 | if (xfer->head) |
| 1234 | xfer->head->prev = NULL; |
| 1235 | else |
| 1236 | xfer->tail = NULL; |
| 1237 | xfer->req_totalsize -= rr->len; |
| 1238 | sfree(rr); |
| 1239 | } |
| 1240 | |
| 1241 | if (retbuf) { |
| 1242 | *buf = retbuf; |
| 1243 | *len = retlen; |
| 1244 | return 1; |
| 1245 | } else |
| 1246 | return 0; |
| 1247 | } |
| 1248 | |
| 1249 | struct fxp_xfer *xfer_upload_init(struct fxp_handle *fh, uint64 offset) |
| 1250 | { |
| 1251 | struct fxp_xfer *xfer = xfer_init(fh, offset); |
| 1252 | |
| 1253 | /* |
| 1254 | * We set `eof' to 1 because this will cause xfer_done() to |
| 1255 | * return true iff there are no outstanding requests. During an |
| 1256 | * upload, our caller will be responsible for working out |
| 1257 | * whether all the data has been sent, so all it needs to know |
| 1258 | * from us is whether the outstanding requests have been |
| 1259 | * handled once that's done. |
| 1260 | */ |
| 1261 | xfer->eof = 1; |
| 1262 | |
| 1263 | return xfer; |
| 1264 | } |
| 1265 | |
| 1266 | int xfer_upload_ready(struct fxp_xfer *xfer) |
| 1267 | { |
| 1268 | if (xfer->req_totalsize < xfer->req_maxsize) |
| 1269 | return 1; |
| 1270 | else |
| 1271 | return 0; |
| 1272 | } |
| 1273 | |
| 1274 | void xfer_upload_data(struct fxp_xfer *xfer, char *buffer, int len) |
| 1275 | { |
| 1276 | struct req *rr; |
| 1277 | struct sftp_request *req; |
| 1278 | |
| 1279 | rr = snew(struct req); |
| 1280 | rr->offset = xfer->offset; |
| 1281 | rr->complete = 0; |
| 1282 | if (xfer->tail) { |
| 1283 | xfer->tail->next = rr; |
| 1284 | rr->prev = xfer->tail; |
| 1285 | } else { |
| 1286 | xfer->head = rr; |
| 1287 | rr->prev = NULL; |
| 1288 | } |
| 1289 | xfer->tail = rr; |
| 1290 | rr->next = NULL; |
| 1291 | |
| 1292 | rr->len = len; |
| 1293 | rr->buffer = NULL; |
| 1294 | sftp_register(req = fxp_write_send(xfer->fh, buffer, rr->offset, len)); |
| 1295 | fxp_set_userdata(req, rr); |
| 1296 | |
| 1297 | xfer->offset = uint64_add32(xfer->offset, rr->len); |
| 1298 | xfer->req_totalsize += rr->len; |
| 1299 | |
| 1300 | #ifdef DEBUG_UPLOAD |
| 1301 | { char buf[40]; uint64_decimal(rr->offset, buf); printf("queueing write request %p at %s [len %d]\n", rr, buf, len); } |
| 1302 | #endif |
| 1303 | } |
| 1304 | |
| 1305 | int xfer_upload_gotpkt(struct fxp_xfer *xfer, struct sftp_packet *pktin) |
| 1306 | { |
| 1307 | struct sftp_request *rreq; |
| 1308 | struct req *rr, *prev, *next; |
| 1309 | int ret; |
| 1310 | |
| 1311 | rreq = sftp_find_request(pktin); |
| 1312 | rr = (struct req *)fxp_get_userdata(rreq); |
| 1313 | if (!rr) |
| 1314 | return 0; /* this packet isn't ours */ |
| 1315 | ret = fxp_write_recv(pktin, rreq); |
| 1316 | #ifdef DEBUG_UPLOAD |
| 1317 | printf("write request %p has returned [%d]\n", rr, ret); |
| 1318 | #endif |
| 1319 | |
| 1320 | /* |
| 1321 | * Remove this one from the queue. |
| 1322 | */ |
| 1323 | prev = rr->prev; |
| 1324 | next = rr->next; |
| 1325 | if (prev) |
| 1326 | prev->next = next; |
| 1327 | else |
| 1328 | xfer->head = next; |
| 1329 | if (next) |
| 1330 | next->prev = prev; |
| 1331 | else |
| 1332 | xfer->tail = prev; |
| 1333 | xfer->req_totalsize -= rr->len; |
| 1334 | sfree(rr); |
| 1335 | |
| 1336 | if (!ret) |
| 1337 | return -1; |
| 1338 | |
| 1339 | return 1; |
| 1340 | } |
| 1341 | |
| 1342 | void xfer_cleanup(struct fxp_xfer *xfer) |
| 1343 | { |
| 1344 | struct req *rr; |
| 1345 | while (xfer->head) { |
| 1346 | rr = xfer->head; |
| 1347 | xfer->head = xfer->head->next; |
| 1348 | sfree(rr->buffer); |
| 1349 | sfree(rr); |
| 1350 | } |
| 1351 | sfree(xfer); |
| 1352 | } |