| 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 | |
| 10 | #include "int64.h" |
| 11 | #include "sftp.h" |
| 12 | |
| 13 | #define smalloc malloc |
| 14 | #define srealloc realloc |
| 15 | #define sfree free |
| 16 | |
| 17 | #define GET_32BIT(cp) \ |
| 18 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
| 19 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
| 20 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
| 21 | ((unsigned long)(unsigned char)(cp)[3])) |
| 22 | |
| 23 | #define PUT_32BIT(cp, value) { \ |
| 24 | (cp)[0] = (unsigned char)((value) >> 24); \ |
| 25 | (cp)[1] = (unsigned char)((value) >> 16); \ |
| 26 | (cp)[2] = (unsigned char)((value) >> 8); \ |
| 27 | (cp)[3] = (unsigned char)(value); } |
| 28 | |
| 29 | struct sftp_packet { |
| 30 | char *data; |
| 31 | int length, maxlen; |
| 32 | int savedpos; |
| 33 | int type; |
| 34 | }; |
| 35 | |
| 36 | static const char *fxp_error_message; |
| 37 | static int fxp_errtype; |
| 38 | |
| 39 | /* ---------------------------------------------------------------------- |
| 40 | * SFTP packet construction functions. |
| 41 | */ |
| 42 | static void sftp_pkt_ensure(struct sftp_packet *pkt, int length) |
| 43 | { |
| 44 | if (pkt->maxlen < length) { |
| 45 | pkt->maxlen = length + 256; |
| 46 | pkt->data = srealloc(pkt->data, pkt->maxlen); |
| 47 | } |
| 48 | } |
| 49 | static void sftp_pkt_adddata(struct sftp_packet *pkt, void *data, int len) |
| 50 | { |
| 51 | pkt->length += len; |
| 52 | sftp_pkt_ensure(pkt, pkt->length); |
| 53 | memcpy(pkt->data + pkt->length - len, data, len); |
| 54 | } |
| 55 | static void sftp_pkt_addbyte(struct sftp_packet *pkt, unsigned char byte) |
| 56 | { |
| 57 | sftp_pkt_adddata(pkt, &byte, 1); |
| 58 | } |
| 59 | static struct sftp_packet *sftp_pkt_init(int pkt_type) |
| 60 | { |
| 61 | struct sftp_packet *pkt; |
| 62 | pkt = smalloc(sizeof(struct sftp_packet)); |
| 63 | pkt->data = NULL; |
| 64 | pkt->savedpos = -1; |
| 65 | pkt->length = 0; |
| 66 | pkt->maxlen = 0; |
| 67 | sftp_pkt_addbyte(pkt, (unsigned char) pkt_type); |
| 68 | fxp_error_message = NULL; |
| 69 | return pkt; |
| 70 | } |
| 71 | static void sftp_pkt_addbool(struct sftp_packet *pkt, unsigned char value) |
| 72 | { |
| 73 | sftp_pkt_adddata(pkt, &value, 1); |
| 74 | } |
| 75 | static void sftp_pkt_adduint32(struct sftp_packet *pkt, |
| 76 | unsigned long value) |
| 77 | { |
| 78 | unsigned char x[4]; |
| 79 | PUT_32BIT(x, value); |
| 80 | sftp_pkt_adddata(pkt, x, 4); |
| 81 | } |
| 82 | static void sftp_pkt_adduint64(struct sftp_packet *pkt, uint64 value) |
| 83 | { |
| 84 | unsigned char x[8]; |
| 85 | PUT_32BIT(x, value.hi); |
| 86 | PUT_32BIT(x + 4, value.lo); |
| 87 | sftp_pkt_adddata(pkt, x, 8); |
| 88 | } |
| 89 | static void sftp_pkt_addstring_start(struct sftp_packet *pkt) |
| 90 | { |
| 91 | sftp_pkt_adduint32(pkt, 0); |
| 92 | pkt->savedpos = pkt->length; |
| 93 | } |
| 94 | static void sftp_pkt_addstring_str(struct sftp_packet *pkt, char *data) |
| 95 | { |
| 96 | sftp_pkt_adddata(pkt, data, strlen(data)); |
| 97 | PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos); |
| 98 | } |
| 99 | static void sftp_pkt_addstring_data(struct sftp_packet *pkt, |
| 100 | char *data, int len) |
| 101 | { |
| 102 | sftp_pkt_adddata(pkt, data, len); |
| 103 | PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos); |
| 104 | } |
| 105 | static void sftp_pkt_addstring(struct sftp_packet *pkt, char *data) |
| 106 | { |
| 107 | sftp_pkt_addstring_start(pkt); |
| 108 | sftp_pkt_addstring_str(pkt, data); |
| 109 | } |
| 110 | |
| 111 | /* ---------------------------------------------------------------------- |
| 112 | * SFTP packet decode functions. |
| 113 | */ |
| 114 | |
| 115 | static unsigned char sftp_pkt_getbyte(struct sftp_packet *pkt) |
| 116 | { |
| 117 | unsigned char value; |
| 118 | if (pkt->length - pkt->savedpos < 1) |
| 119 | return 0; /* arrgh, no way to decline (FIXME?) */ |
| 120 | value = (unsigned char) pkt->data[pkt->savedpos]; |
| 121 | pkt->savedpos++; |
| 122 | return value; |
| 123 | } |
| 124 | static unsigned long sftp_pkt_getuint32(struct sftp_packet *pkt) |
| 125 | { |
| 126 | unsigned long value; |
| 127 | if (pkt->length - pkt->savedpos < 4) |
| 128 | return 0; /* arrgh, no way to decline (FIXME?) */ |
| 129 | value = GET_32BIT(pkt->data + pkt->savedpos); |
| 130 | pkt->savedpos += 4; |
| 131 | return value; |
| 132 | } |
| 133 | static void sftp_pkt_getstring(struct sftp_packet *pkt, |
| 134 | char **p, int *length) |
| 135 | { |
| 136 | *p = NULL; |
| 137 | if (pkt->length - pkt->savedpos < 4) |
| 138 | return; |
| 139 | *length = GET_32BIT(pkt->data + pkt->savedpos); |
| 140 | pkt->savedpos += 4; |
| 141 | if (pkt->length - pkt->savedpos < *length) |
| 142 | return; |
| 143 | *p = pkt->data + pkt->savedpos; |
| 144 | pkt->savedpos += *length; |
| 145 | } |
| 146 | static struct fxp_attrs sftp_pkt_getattrs(struct sftp_packet *pkt) |
| 147 | { |
| 148 | struct fxp_attrs ret; |
| 149 | ret.flags = sftp_pkt_getuint32(pkt); |
| 150 | if (ret.flags & SSH_FILEXFER_ATTR_SIZE) { |
| 151 | unsigned long hi, lo; |
| 152 | hi = sftp_pkt_getuint32(pkt); |
| 153 | lo = sftp_pkt_getuint32(pkt); |
| 154 | ret.size = uint64_make(hi, lo); |
| 155 | } |
| 156 | if (ret.flags & SSH_FILEXFER_ATTR_UIDGID) { |
| 157 | ret.uid = sftp_pkt_getuint32(pkt); |
| 158 | ret.gid = sftp_pkt_getuint32(pkt); |
| 159 | } |
| 160 | if (ret.flags & SSH_FILEXFER_ATTR_PERMISSIONS) { |
| 161 | ret.permissions = sftp_pkt_getuint32(pkt); |
| 162 | } |
| 163 | if (ret.flags & SSH_FILEXFER_ATTR_ACMODTIME) { |
| 164 | ret.atime = sftp_pkt_getuint32(pkt); |
| 165 | ret.mtime = sftp_pkt_getuint32(pkt); |
| 166 | } |
| 167 | if (ret.flags & SSH_FILEXFER_ATTR_EXTENDED) { |
| 168 | int count; |
| 169 | count = sftp_pkt_getuint32(pkt); |
| 170 | while (count--) { |
| 171 | char *str; |
| 172 | int len; |
| 173 | /* |
| 174 | * We should try to analyse these, if we ever find one |
| 175 | * we recognise. |
| 176 | */ |
| 177 | sftp_pkt_getstring(pkt, &str, &len); |
| 178 | sftp_pkt_getstring(pkt, &str, &len); |
| 179 | } |
| 180 | } |
| 181 | return ret; |
| 182 | } |
| 183 | static void sftp_pkt_free(struct sftp_packet *pkt) |
| 184 | { |
| 185 | if (pkt->data) |
| 186 | sfree(pkt->data); |
| 187 | sfree(pkt); |
| 188 | } |
| 189 | |
| 190 | /* ---------------------------------------------------------------------- |
| 191 | * Send and receive packet functions. |
| 192 | */ |
| 193 | int sftp_send(struct sftp_packet *pkt) |
| 194 | { |
| 195 | int ret; |
| 196 | char x[4]; |
| 197 | PUT_32BIT(x, pkt->length); |
| 198 | ret = (sftp_senddata(x, 4) && sftp_senddata(pkt->data, pkt->length)); |
| 199 | sftp_pkt_free(pkt); |
| 200 | return ret; |
| 201 | } |
| 202 | struct sftp_packet *sftp_recv(void) |
| 203 | { |
| 204 | struct sftp_packet *pkt; |
| 205 | char x[4]; |
| 206 | |
| 207 | if (!sftp_recvdata(x, 4)) |
| 208 | return NULL; |
| 209 | |
| 210 | pkt = smalloc(sizeof(struct sftp_packet)); |
| 211 | pkt->savedpos = 0; |
| 212 | pkt->length = pkt->maxlen = GET_32BIT(x); |
| 213 | pkt->data = smalloc(pkt->length); |
| 214 | |
| 215 | if (!sftp_recvdata(pkt->data, pkt->length)) { |
| 216 | sftp_pkt_free(pkt); |
| 217 | return NULL; |
| 218 | } |
| 219 | |
| 220 | pkt->type = sftp_pkt_getbyte(pkt); |
| 221 | |
| 222 | return pkt; |
| 223 | } |
| 224 | |
| 225 | /* ---------------------------------------------------------------------- |
| 226 | * String handling routines. |
| 227 | */ |
| 228 | |
| 229 | static char *mkstr(char *s, int len) |
| 230 | { |
| 231 | char *p = smalloc(len + 1); |
| 232 | memcpy(p, s, len); |
| 233 | p[len] = '\0'; |
| 234 | return p; |
| 235 | } |
| 236 | |
| 237 | /* ---------------------------------------------------------------------- |
| 238 | * SFTP primitives. |
| 239 | */ |
| 240 | |
| 241 | /* |
| 242 | * Deal with (and free) an FXP_STATUS packet. Return 1 if |
| 243 | * SSH_FX_OK, 0 if SSH_FX_EOF, and -1 for anything else (error). |
| 244 | * Also place the status into fxp_errtype. |
| 245 | */ |
| 246 | static int fxp_got_status(struct sftp_packet *pktin) |
| 247 | { |
| 248 | static const char *const messages[] = { |
| 249 | /* SSH_FX_OK. The only time we will display a _message_ for this |
| 250 | * is if we were expecting something other than FXP_STATUS on |
| 251 | * success, so this is actually an error message! */ |
| 252 | "unexpected OK response", |
| 253 | "end of file", |
| 254 | "no such file or directory", |
| 255 | "permission denied", |
| 256 | "failure", |
| 257 | "bad message", |
| 258 | "no connection", |
| 259 | "connection lost", |
| 260 | "operation unsupported", |
| 261 | }; |
| 262 | |
| 263 | if (pktin->type != SSH_FXP_STATUS) { |
| 264 | fxp_error_message = "expected FXP_STATUS packet"; |
| 265 | fxp_errtype = -1; |
| 266 | } else { |
| 267 | fxp_errtype = sftp_pkt_getuint32(pktin); |
| 268 | if (fxp_errtype < 0 || |
| 269 | fxp_errtype >= sizeof(messages) / sizeof(*messages)) |
| 270 | fxp_error_message = "unknown error code"; |
| 271 | else |
| 272 | fxp_error_message = messages[fxp_errtype]; |
| 273 | } |
| 274 | |
| 275 | if (fxp_errtype == SSH_FX_OK) |
| 276 | return 1; |
| 277 | else if (fxp_errtype == SSH_FX_EOF) |
| 278 | return 0; |
| 279 | else |
| 280 | return -1; |
| 281 | } |
| 282 | |
| 283 | static void fxp_internal_error(char *msg) |
| 284 | { |
| 285 | fxp_error_message = msg; |
| 286 | fxp_errtype = -1; |
| 287 | } |
| 288 | |
| 289 | const char *fxp_error(void) |
| 290 | { |
| 291 | return fxp_error_message; |
| 292 | } |
| 293 | |
| 294 | int fxp_error_type(void) |
| 295 | { |
| 296 | return fxp_errtype; |
| 297 | } |
| 298 | |
| 299 | /* |
| 300 | * Perform exchange of init/version packets. Return 0 on failure. |
| 301 | */ |
| 302 | int fxp_init(void) |
| 303 | { |
| 304 | struct sftp_packet *pktout, *pktin; |
| 305 | int remotever; |
| 306 | |
| 307 | pktout = sftp_pkt_init(SSH_FXP_INIT); |
| 308 | sftp_pkt_adduint32(pktout, SFTP_PROTO_VERSION); |
| 309 | sftp_send(pktout); |
| 310 | |
| 311 | pktin = sftp_recv(); |
| 312 | if (!pktin) { |
| 313 | fxp_internal_error("could not connect"); |
| 314 | return 0; |
| 315 | } |
| 316 | if (pktin->type != SSH_FXP_VERSION) { |
| 317 | fxp_internal_error("did not receive FXP_VERSION"); |
| 318 | return 0; |
| 319 | } |
| 320 | remotever = sftp_pkt_getuint32(pktin); |
| 321 | if (remotever > SFTP_PROTO_VERSION) { |
| 322 | fxp_internal_error |
| 323 | ("remote protocol is more advanced than we support"); |
| 324 | return 0; |
| 325 | } |
| 326 | /* |
| 327 | * In principle, this packet might also contain extension- |
| 328 | * string pairs. We should work through them and look for any |
| 329 | * we recognise. In practice we don't currently do so because |
| 330 | * we know we don't recognise _any_. |
| 331 | */ |
| 332 | sftp_pkt_free(pktin); |
| 333 | |
| 334 | return 1; |
| 335 | } |
| 336 | |
| 337 | /* |
| 338 | * Canonify a pathname. |
| 339 | */ |
| 340 | char *fxp_realpath(char *path) |
| 341 | { |
| 342 | struct sftp_packet *pktin, *pktout; |
| 343 | int id; |
| 344 | |
| 345 | pktout = sftp_pkt_init(SSH_FXP_REALPATH); |
| 346 | sftp_pkt_adduint32(pktout, 0x123); /* request id */ |
| 347 | sftp_pkt_addstring_start(pktout); |
| 348 | sftp_pkt_addstring_str(pktout, path); |
| 349 | sftp_send(pktout); |
| 350 | pktin = sftp_recv(); |
| 351 | id = sftp_pkt_getuint32(pktin); |
| 352 | if (id != 0x123) { |
| 353 | fxp_internal_error("request ID mismatch\n"); |
| 354 | return NULL; |
| 355 | } |
| 356 | if (pktin->type == SSH_FXP_NAME) { |
| 357 | int count; |
| 358 | char *path; |
| 359 | int len; |
| 360 | |
| 361 | count = sftp_pkt_getuint32(pktin); |
| 362 | if (count != 1) { |
| 363 | fxp_internal_error("REALPATH returned name count != 1\n"); |
| 364 | return NULL; |
| 365 | } |
| 366 | sftp_pkt_getstring(pktin, &path, &len); |
| 367 | if (!path) { |
| 368 | fxp_internal_error("REALPATH returned malformed FXP_NAME\n"); |
| 369 | return NULL; |
| 370 | } |
| 371 | path = mkstr(path, len); |
| 372 | sftp_pkt_free(pktin); |
| 373 | return path; |
| 374 | } else { |
| 375 | fxp_got_status(pktin); |
| 376 | return NULL; |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * Open a file. |
| 382 | */ |
| 383 | struct fxp_handle *fxp_open(char *path, int type) |
| 384 | { |
| 385 | struct sftp_packet *pktin, *pktout; |
| 386 | int id; |
| 387 | |
| 388 | pktout = sftp_pkt_init(SSH_FXP_OPEN); |
| 389 | sftp_pkt_adduint32(pktout, 0x567); /* request id */ |
| 390 | sftp_pkt_addstring(pktout, path); |
| 391 | sftp_pkt_adduint32(pktout, type); |
| 392 | sftp_pkt_adduint32(pktout, 0); /* (FIXME) empty ATTRS structure */ |
| 393 | sftp_send(pktout); |
| 394 | pktin = sftp_recv(); |
| 395 | id = sftp_pkt_getuint32(pktin); |
| 396 | if (id != 0x567) { |
| 397 | fxp_internal_error("request ID mismatch\n"); |
| 398 | return NULL; |
| 399 | } |
| 400 | if (pktin->type == SSH_FXP_HANDLE) { |
| 401 | char *hstring; |
| 402 | struct fxp_handle *handle; |
| 403 | int len; |
| 404 | |
| 405 | sftp_pkt_getstring(pktin, &hstring, &len); |
| 406 | if (!hstring) { |
| 407 | fxp_internal_error("OPEN returned malformed FXP_HANDLE\n"); |
| 408 | return NULL; |
| 409 | } |
| 410 | handle = smalloc(sizeof(struct fxp_handle)); |
| 411 | handle->hstring = mkstr(hstring, len); |
| 412 | handle->hlen = len; |
| 413 | sftp_pkt_free(pktin); |
| 414 | return handle; |
| 415 | } else { |
| 416 | fxp_got_status(pktin); |
| 417 | return NULL; |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | /* |
| 422 | * Open a directory. |
| 423 | */ |
| 424 | struct fxp_handle *fxp_opendir(char *path) |
| 425 | { |
| 426 | struct sftp_packet *pktin, *pktout; |
| 427 | int id; |
| 428 | |
| 429 | pktout = sftp_pkt_init(SSH_FXP_OPENDIR); |
| 430 | sftp_pkt_adduint32(pktout, 0x456); /* request id */ |
| 431 | sftp_pkt_addstring(pktout, path); |
| 432 | sftp_send(pktout); |
| 433 | pktin = sftp_recv(); |
| 434 | id = sftp_pkt_getuint32(pktin); |
| 435 | if (id != 0x456) { |
| 436 | fxp_internal_error("request ID mismatch\n"); |
| 437 | return NULL; |
| 438 | } |
| 439 | if (pktin->type == SSH_FXP_HANDLE) { |
| 440 | char *hstring; |
| 441 | struct fxp_handle *handle; |
| 442 | int len; |
| 443 | |
| 444 | sftp_pkt_getstring(pktin, &hstring, &len); |
| 445 | if (!hstring) { |
| 446 | fxp_internal_error("OPENDIR returned malformed FXP_HANDLE\n"); |
| 447 | return NULL; |
| 448 | } |
| 449 | handle = smalloc(sizeof(struct fxp_handle)); |
| 450 | handle->hstring = mkstr(hstring, len); |
| 451 | handle->hlen = len; |
| 452 | sftp_pkt_free(pktin); |
| 453 | return handle; |
| 454 | } else { |
| 455 | fxp_got_status(pktin); |
| 456 | return NULL; |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | /* |
| 461 | * Close a file/dir. |
| 462 | */ |
| 463 | void fxp_close(struct fxp_handle *handle) |
| 464 | { |
| 465 | struct sftp_packet *pktin, *pktout; |
| 466 | int id; |
| 467 | |
| 468 | pktout = sftp_pkt_init(SSH_FXP_CLOSE); |
| 469 | sftp_pkt_adduint32(pktout, 0x789); /* request id */ |
| 470 | sftp_pkt_addstring_start(pktout); |
| 471 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 472 | sftp_send(pktout); |
| 473 | pktin = sftp_recv(); |
| 474 | id = sftp_pkt_getuint32(pktin); |
| 475 | if (id != 0x789) { |
| 476 | fxp_internal_error("request ID mismatch\n"); |
| 477 | return; |
| 478 | } |
| 479 | fxp_got_status(pktin); |
| 480 | sfree(handle->hstring); |
| 481 | sfree(handle); |
| 482 | } |
| 483 | |
| 484 | int fxp_mkdir(char *path) |
| 485 | { |
| 486 | struct sftp_packet *pktin, *pktout; |
| 487 | int id; |
| 488 | |
| 489 | pktout = sftp_pkt_init(SSH_FXP_MKDIR); |
| 490 | sftp_pkt_adduint32(pktout, 0x234); /* request id */ |
| 491 | sftp_pkt_addstring_start(pktout); |
| 492 | sftp_pkt_addstring_data(pktout, path, strlen(path)); |
| 493 | sftp_pkt_adduint32(pktout, 0); /* (FIXME) empty ATTRS structure */ |
| 494 | sftp_send(pktout); |
| 495 | pktin = sftp_recv(); |
| 496 | id = sftp_pkt_getuint32(pktin); |
| 497 | if (id != 0x234) { |
| 498 | fxp_internal_error("request ID mismatch\n"); |
| 499 | return 0; |
| 500 | } |
| 501 | id = fxp_got_status(pktin); |
| 502 | if (id != 1) { |
| 503 | return 0; |
| 504 | } |
| 505 | return 1; |
| 506 | } |
| 507 | |
| 508 | int fxp_rmdir(char *path) |
| 509 | { |
| 510 | struct sftp_packet *pktin, *pktout; |
| 511 | int id; |
| 512 | |
| 513 | pktout = sftp_pkt_init(SSH_FXP_RMDIR); |
| 514 | sftp_pkt_adduint32(pktout, 0x345); /* request id */ |
| 515 | sftp_pkt_addstring_start(pktout); |
| 516 | sftp_pkt_addstring_data(pktout, path, strlen(path)); |
| 517 | sftp_send(pktout); |
| 518 | pktin = sftp_recv(); |
| 519 | id = sftp_pkt_getuint32(pktin); |
| 520 | if (id != 0x345) { |
| 521 | fxp_internal_error("request ID mismatch\n"); |
| 522 | return 0; |
| 523 | } |
| 524 | id = fxp_got_status(pktin); |
| 525 | if (id != 1) { |
| 526 | return 0; |
| 527 | } |
| 528 | return 1; |
| 529 | } |
| 530 | |
| 531 | int fxp_rm(char *fname) |
| 532 | { |
| 533 | struct sftp_packet *pktin, *pktout; |
| 534 | int id; |
| 535 | |
| 536 | pktout = sftp_pkt_init(SSH_FXP_REMOVE); |
| 537 | sftp_pkt_adduint32(pktout, 0x678); /* request id */ |
| 538 | sftp_pkt_addstring_start(pktout); |
| 539 | sftp_pkt_addstring_data(pktout, fname, strlen(fname)); |
| 540 | sftp_send(pktout); |
| 541 | pktin = sftp_recv(); |
| 542 | id = sftp_pkt_getuint32(pktin); |
| 543 | if (id != 0x678) { |
| 544 | fxp_internal_error("request ID mismatch\n"); |
| 545 | return 0; |
| 546 | } |
| 547 | id = fxp_got_status(pktin); |
| 548 | if (id != 1) { |
| 549 | return 0; |
| 550 | } |
| 551 | return 1; |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * Read from a file. Returns the number of bytes read, or -1 on an |
| 556 | * error, or possibly 0 if EOF. (I'm not entirely sure whether it |
| 557 | * will return 0 on EOF, or return -1 and store SSH_FX_EOF in the |
| 558 | * error indicator. It might even depend on the SFTP server.) |
| 559 | */ |
| 560 | int fxp_read(struct fxp_handle *handle, char *buffer, uint64 offset, |
| 561 | int len) |
| 562 | { |
| 563 | struct sftp_packet *pktin, *pktout; |
| 564 | int id; |
| 565 | |
| 566 | pktout = sftp_pkt_init(SSH_FXP_READ); |
| 567 | sftp_pkt_adduint32(pktout, 0xBCD); /* request id */ |
| 568 | sftp_pkt_addstring_start(pktout); |
| 569 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 570 | sftp_pkt_adduint64(pktout, offset); |
| 571 | sftp_pkt_adduint32(pktout, len); |
| 572 | sftp_send(pktout); |
| 573 | pktin = sftp_recv(); |
| 574 | id = sftp_pkt_getuint32(pktin); |
| 575 | if (id != 0xBCD) { |
| 576 | fxp_internal_error("request ID mismatch"); |
| 577 | return -1; |
| 578 | } |
| 579 | if (pktin->type == SSH_FXP_DATA) { |
| 580 | char *str; |
| 581 | int rlen; |
| 582 | |
| 583 | sftp_pkt_getstring(pktin, &str, &rlen); |
| 584 | |
| 585 | if (rlen > len || rlen < 0) { |
| 586 | fxp_internal_error("READ returned more bytes than requested"); |
| 587 | return -1; |
| 588 | } |
| 589 | |
| 590 | memcpy(buffer, str, rlen); |
| 591 | sfree(pktin); |
| 592 | return rlen; |
| 593 | } else { |
| 594 | fxp_got_status(pktin); |
| 595 | return -1; |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | /* |
| 600 | * Read from a directory. |
| 601 | */ |
| 602 | struct fxp_names *fxp_readdir(struct fxp_handle *handle) |
| 603 | { |
| 604 | struct sftp_packet *pktin, *pktout; |
| 605 | int id; |
| 606 | |
| 607 | pktout = sftp_pkt_init(SSH_FXP_READDIR); |
| 608 | sftp_pkt_adduint32(pktout, 0xABC); /* request id */ |
| 609 | sftp_pkt_addstring_start(pktout); |
| 610 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 611 | sftp_send(pktout); |
| 612 | pktin = sftp_recv(); |
| 613 | id = sftp_pkt_getuint32(pktin); |
| 614 | if (id != 0xABC) { |
| 615 | fxp_internal_error("request ID mismatch\n"); |
| 616 | return NULL; |
| 617 | } |
| 618 | if (pktin->type == SSH_FXP_NAME) { |
| 619 | struct fxp_names *ret; |
| 620 | int i; |
| 621 | ret = smalloc(sizeof(struct fxp_names)); |
| 622 | ret->nnames = sftp_pkt_getuint32(pktin); |
| 623 | ret->names = smalloc(ret->nnames * sizeof(struct fxp_name)); |
| 624 | for (i = 0; i < ret->nnames; i++) { |
| 625 | char *str; |
| 626 | int len; |
| 627 | sftp_pkt_getstring(pktin, &str, &len); |
| 628 | ret->names[i].filename = mkstr(str, len); |
| 629 | sftp_pkt_getstring(pktin, &str, &len); |
| 630 | ret->names[i].longname = mkstr(str, len); |
| 631 | ret->names[i].attrs = sftp_pkt_getattrs(pktin); |
| 632 | } |
| 633 | return ret; |
| 634 | } else { |
| 635 | fxp_got_status(pktin); |
| 636 | return NULL; |
| 637 | } |
| 638 | } |
| 639 | |
| 640 | /* |
| 641 | * Write to a file. Returns 0 on error, 1 on OK. |
| 642 | */ |
| 643 | int fxp_write(struct fxp_handle *handle, char *buffer, uint64 offset, |
| 644 | int len) |
| 645 | { |
| 646 | struct sftp_packet *pktin, *pktout; |
| 647 | int id; |
| 648 | |
| 649 | pktout = sftp_pkt_init(SSH_FXP_WRITE); |
| 650 | sftp_pkt_adduint32(pktout, 0xDCB); /* request id */ |
| 651 | sftp_pkt_addstring_start(pktout); |
| 652 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 653 | sftp_pkt_adduint64(pktout, offset); |
| 654 | sftp_pkt_addstring_start(pktout); |
| 655 | sftp_pkt_addstring_data(pktout, buffer, len); |
| 656 | sftp_send(pktout); |
| 657 | pktin = sftp_recv(); |
| 658 | id = sftp_pkt_getuint32(pktin); |
| 659 | if (id != 0xDCB) { |
| 660 | fxp_internal_error("request ID mismatch\n"); |
| 661 | return 0; |
| 662 | } |
| 663 | fxp_got_status(pktin); |
| 664 | return fxp_errtype == SSH_FX_OK; |
| 665 | } |
| 666 | |
| 667 | /* |
| 668 | * Free up an fxp_names structure. |
| 669 | */ |
| 670 | void fxp_free_names(struct fxp_names *names) |
| 671 | { |
| 672 | int i; |
| 673 | |
| 674 | for (i = 0; i < names->nnames; i++) { |
| 675 | sfree(names->names[i].filename); |
| 676 | sfree(names->names[i].longname); |
| 677 | } |
| 678 | sfree(names->names); |
| 679 | sfree(names); |
| 680 | } |