| 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 "misc.h" |
| 11 | #include "int64.h" |
| 12 | #include "sftp.h" |
| 13 | |
| 14 | #define GET_32BIT(cp) \ |
| 15 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
| 16 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
| 17 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
| 18 | ((unsigned long)(unsigned char)(cp)[3])) |
| 19 | |
| 20 | #define PUT_32BIT(cp, value) { \ |
| 21 | (cp)[0] = (unsigned char)((value) >> 24); \ |
| 22 | (cp)[1] = (unsigned char)((value) >> 16); \ |
| 23 | (cp)[2] = (unsigned char)((value) >> 8); \ |
| 24 | (cp)[3] = (unsigned char)(value); } |
| 25 | |
| 26 | struct sftp_packet { |
| 27 | char *data; |
| 28 | int length, maxlen; |
| 29 | int savedpos; |
| 30 | int type; |
| 31 | }; |
| 32 | |
| 33 | static const char *fxp_error_message; |
| 34 | static int fxp_errtype; |
| 35 | |
| 36 | /* ---------------------------------------------------------------------- |
| 37 | * SFTP packet construction functions. |
| 38 | */ |
| 39 | static void sftp_pkt_ensure(struct sftp_packet *pkt, int length) |
| 40 | { |
| 41 | if (pkt->maxlen < length) { |
| 42 | pkt->maxlen = length + 256; |
| 43 | pkt->data = srealloc(pkt->data, pkt->maxlen); |
| 44 | } |
| 45 | } |
| 46 | static void sftp_pkt_adddata(struct sftp_packet *pkt, void *data, int len) |
| 47 | { |
| 48 | pkt->length += len; |
| 49 | sftp_pkt_ensure(pkt, pkt->length); |
| 50 | memcpy(pkt->data + pkt->length - len, data, len); |
| 51 | } |
| 52 | static void sftp_pkt_addbyte(struct sftp_packet *pkt, unsigned char byte) |
| 53 | { |
| 54 | sftp_pkt_adddata(pkt, &byte, 1); |
| 55 | } |
| 56 | static struct sftp_packet *sftp_pkt_init(int pkt_type) |
| 57 | { |
| 58 | struct sftp_packet *pkt; |
| 59 | pkt = smalloc(sizeof(struct sftp_packet)); |
| 60 | pkt->data = NULL; |
| 61 | pkt->savedpos = -1; |
| 62 | pkt->length = 0; |
| 63 | pkt->maxlen = 0; |
| 64 | sftp_pkt_addbyte(pkt, (unsigned char) pkt_type); |
| 65 | return pkt; |
| 66 | } |
| 67 | static void sftp_pkt_addbool(struct sftp_packet *pkt, unsigned char value) |
| 68 | { |
| 69 | sftp_pkt_adddata(pkt, &value, 1); |
| 70 | } |
| 71 | static void sftp_pkt_adduint32(struct sftp_packet *pkt, |
| 72 | unsigned long value) |
| 73 | { |
| 74 | unsigned char x[4]; |
| 75 | PUT_32BIT(x, value); |
| 76 | sftp_pkt_adddata(pkt, x, 4); |
| 77 | } |
| 78 | static void sftp_pkt_adduint64(struct sftp_packet *pkt, uint64 value) |
| 79 | { |
| 80 | unsigned char x[8]; |
| 81 | PUT_32BIT(x, value.hi); |
| 82 | PUT_32BIT(x + 4, value.lo); |
| 83 | sftp_pkt_adddata(pkt, x, 8); |
| 84 | } |
| 85 | static void sftp_pkt_addstring_start(struct sftp_packet *pkt) |
| 86 | { |
| 87 | sftp_pkt_adduint32(pkt, 0); |
| 88 | pkt->savedpos = pkt->length; |
| 89 | } |
| 90 | static void sftp_pkt_addstring_str(struct sftp_packet *pkt, char *data) |
| 91 | { |
| 92 | sftp_pkt_adddata(pkt, data, strlen(data)); |
| 93 | PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos); |
| 94 | } |
| 95 | static void sftp_pkt_addstring_data(struct sftp_packet *pkt, |
| 96 | char *data, int len) |
| 97 | { |
| 98 | sftp_pkt_adddata(pkt, data, len); |
| 99 | PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos); |
| 100 | } |
| 101 | static void sftp_pkt_addstring(struct sftp_packet *pkt, char *data) |
| 102 | { |
| 103 | sftp_pkt_addstring_start(pkt); |
| 104 | sftp_pkt_addstring_str(pkt, data); |
| 105 | } |
| 106 | static void sftp_pkt_addattrs(struct sftp_packet *pkt, struct fxp_attrs attrs) |
| 107 | { |
| 108 | sftp_pkt_adduint32(pkt, attrs.flags); |
| 109 | if (attrs.flags & SSH_FILEXFER_ATTR_SIZE) { |
| 110 | sftp_pkt_adduint32(pkt, attrs.size.hi); |
| 111 | sftp_pkt_adduint32(pkt, attrs.size.lo); |
| 112 | } |
| 113 | if (attrs.flags & SSH_FILEXFER_ATTR_UIDGID) { |
| 114 | sftp_pkt_adduint32(pkt, attrs.uid); |
| 115 | sftp_pkt_adduint32(pkt, attrs.gid); |
| 116 | } |
| 117 | if (attrs.flags & SSH_FILEXFER_ATTR_PERMISSIONS) { |
| 118 | sftp_pkt_adduint32(pkt, attrs.permissions); |
| 119 | } |
| 120 | if (attrs.flags & SSH_FILEXFER_ATTR_ACMODTIME) { |
| 121 | sftp_pkt_adduint32(pkt, attrs.atime); |
| 122 | sftp_pkt_adduint32(pkt, attrs.mtime); |
| 123 | } |
| 124 | if (attrs.flags & SSH_FILEXFER_ATTR_EXTENDED) { |
| 125 | /* |
| 126 | * We currently don't support sending any extended |
| 127 | * attributes. |
| 128 | */ |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | /* ---------------------------------------------------------------------- |
| 133 | * SFTP packet decode functions. |
| 134 | */ |
| 135 | |
| 136 | static unsigned char sftp_pkt_getbyte(struct sftp_packet *pkt) |
| 137 | { |
| 138 | unsigned char value; |
| 139 | if (pkt->length - pkt->savedpos < 1) |
| 140 | return 0; /* arrgh, no way to decline (FIXME?) */ |
| 141 | value = (unsigned char) pkt->data[pkt->savedpos]; |
| 142 | pkt->savedpos++; |
| 143 | return value; |
| 144 | } |
| 145 | static unsigned long sftp_pkt_getuint32(struct sftp_packet *pkt) |
| 146 | { |
| 147 | unsigned long value; |
| 148 | if (pkt->length - pkt->savedpos < 4) |
| 149 | return 0; /* arrgh, no way to decline (FIXME?) */ |
| 150 | value = GET_32BIT(pkt->data + pkt->savedpos); |
| 151 | pkt->savedpos += 4; |
| 152 | return value; |
| 153 | } |
| 154 | static void sftp_pkt_getstring(struct sftp_packet *pkt, |
| 155 | char **p, int *length) |
| 156 | { |
| 157 | *p = NULL; |
| 158 | if (pkt->length - pkt->savedpos < 4) |
| 159 | return; |
| 160 | *length = GET_32BIT(pkt->data + pkt->savedpos); |
| 161 | pkt->savedpos += 4; |
| 162 | if (pkt->length - pkt->savedpos < *length) |
| 163 | return; |
| 164 | *p = pkt->data + pkt->savedpos; |
| 165 | pkt->savedpos += *length; |
| 166 | } |
| 167 | static struct fxp_attrs sftp_pkt_getattrs(struct sftp_packet *pkt) |
| 168 | { |
| 169 | struct fxp_attrs ret; |
| 170 | ret.flags = sftp_pkt_getuint32(pkt); |
| 171 | if (ret.flags & SSH_FILEXFER_ATTR_SIZE) { |
| 172 | unsigned long hi, lo; |
| 173 | hi = sftp_pkt_getuint32(pkt); |
| 174 | lo = sftp_pkt_getuint32(pkt); |
| 175 | ret.size = uint64_make(hi, lo); |
| 176 | } |
| 177 | if (ret.flags & SSH_FILEXFER_ATTR_UIDGID) { |
| 178 | ret.uid = sftp_pkt_getuint32(pkt); |
| 179 | ret.gid = sftp_pkt_getuint32(pkt); |
| 180 | } |
| 181 | if (ret.flags & SSH_FILEXFER_ATTR_PERMISSIONS) { |
| 182 | ret.permissions = sftp_pkt_getuint32(pkt); |
| 183 | } |
| 184 | if (ret.flags & SSH_FILEXFER_ATTR_ACMODTIME) { |
| 185 | ret.atime = sftp_pkt_getuint32(pkt); |
| 186 | ret.mtime = sftp_pkt_getuint32(pkt); |
| 187 | } |
| 188 | if (ret.flags & SSH_FILEXFER_ATTR_EXTENDED) { |
| 189 | int count; |
| 190 | count = sftp_pkt_getuint32(pkt); |
| 191 | while (count--) { |
| 192 | char *str; |
| 193 | int len; |
| 194 | /* |
| 195 | * We should try to analyse these, if we ever find one |
| 196 | * we recognise. |
| 197 | */ |
| 198 | sftp_pkt_getstring(pkt, &str, &len); |
| 199 | sftp_pkt_getstring(pkt, &str, &len); |
| 200 | } |
| 201 | } |
| 202 | return ret; |
| 203 | } |
| 204 | static void sftp_pkt_free(struct sftp_packet *pkt) |
| 205 | { |
| 206 | if (pkt->data) |
| 207 | sfree(pkt->data); |
| 208 | sfree(pkt); |
| 209 | } |
| 210 | |
| 211 | /* ---------------------------------------------------------------------- |
| 212 | * Send and receive packet functions. |
| 213 | */ |
| 214 | int sftp_send(struct sftp_packet *pkt) |
| 215 | { |
| 216 | int ret; |
| 217 | char x[4]; |
| 218 | PUT_32BIT(x, pkt->length); |
| 219 | ret = (sftp_senddata(x, 4) && sftp_senddata(pkt->data, pkt->length)); |
| 220 | sftp_pkt_free(pkt); |
| 221 | return ret; |
| 222 | } |
| 223 | struct sftp_packet *sftp_recv(void) |
| 224 | { |
| 225 | struct sftp_packet *pkt; |
| 226 | char x[4]; |
| 227 | |
| 228 | if (!sftp_recvdata(x, 4)) |
| 229 | return NULL; |
| 230 | |
| 231 | pkt = smalloc(sizeof(struct sftp_packet)); |
| 232 | pkt->savedpos = 0; |
| 233 | pkt->length = pkt->maxlen = GET_32BIT(x); |
| 234 | pkt->data = smalloc(pkt->length); |
| 235 | |
| 236 | if (!sftp_recvdata(pkt->data, pkt->length)) { |
| 237 | sftp_pkt_free(pkt); |
| 238 | return NULL; |
| 239 | } |
| 240 | |
| 241 | pkt->type = sftp_pkt_getbyte(pkt); |
| 242 | |
| 243 | return pkt; |
| 244 | } |
| 245 | |
| 246 | /* ---------------------------------------------------------------------- |
| 247 | * String handling routines. |
| 248 | */ |
| 249 | |
| 250 | static char *mkstr(char *s, int len) |
| 251 | { |
| 252 | char *p = smalloc(len + 1); |
| 253 | memcpy(p, s, len); |
| 254 | p[len] = '\0'; |
| 255 | return p; |
| 256 | } |
| 257 | |
| 258 | /* ---------------------------------------------------------------------- |
| 259 | * SFTP primitives. |
| 260 | */ |
| 261 | |
| 262 | /* |
| 263 | * Deal with (and free) an FXP_STATUS packet. Return 1 if |
| 264 | * SSH_FX_OK, 0 if SSH_FX_EOF, and -1 for anything else (error). |
| 265 | * Also place the status into fxp_errtype. |
| 266 | */ |
| 267 | static int fxp_got_status(struct sftp_packet *pktin) |
| 268 | { |
| 269 | static const char *const messages[] = { |
| 270 | /* SSH_FX_OK. The only time we will display a _message_ for this |
| 271 | * is if we were expecting something other than FXP_STATUS on |
| 272 | * success, so this is actually an error message! */ |
| 273 | "unexpected OK response", |
| 274 | "end of file", |
| 275 | "no such file or directory", |
| 276 | "permission denied", |
| 277 | "failure", |
| 278 | "bad message", |
| 279 | "no connection", |
| 280 | "connection lost", |
| 281 | "operation unsupported", |
| 282 | }; |
| 283 | |
| 284 | if (pktin->type != SSH_FXP_STATUS) { |
| 285 | fxp_error_message = "expected FXP_STATUS packet"; |
| 286 | fxp_errtype = -1; |
| 287 | } else { |
| 288 | fxp_errtype = sftp_pkt_getuint32(pktin); |
| 289 | if (fxp_errtype < 0 || |
| 290 | fxp_errtype >= sizeof(messages) / sizeof(*messages)) |
| 291 | fxp_error_message = "unknown error code"; |
| 292 | else |
| 293 | fxp_error_message = messages[fxp_errtype]; |
| 294 | } |
| 295 | |
| 296 | if (fxp_errtype == SSH_FX_OK) |
| 297 | return 1; |
| 298 | else if (fxp_errtype == SSH_FX_EOF) |
| 299 | return 0; |
| 300 | else |
| 301 | return -1; |
| 302 | } |
| 303 | |
| 304 | static void fxp_internal_error(char *msg) |
| 305 | { |
| 306 | fxp_error_message = msg; |
| 307 | fxp_errtype = -1; |
| 308 | } |
| 309 | |
| 310 | const char *fxp_error(void) |
| 311 | { |
| 312 | return fxp_error_message; |
| 313 | } |
| 314 | |
| 315 | int fxp_error_type(void) |
| 316 | { |
| 317 | return fxp_errtype; |
| 318 | } |
| 319 | |
| 320 | /* |
| 321 | * Perform exchange of init/version packets. Return 0 on failure. |
| 322 | */ |
| 323 | int fxp_init(void) |
| 324 | { |
| 325 | struct sftp_packet *pktout, *pktin; |
| 326 | int remotever; |
| 327 | |
| 328 | pktout = sftp_pkt_init(SSH_FXP_INIT); |
| 329 | sftp_pkt_adduint32(pktout, SFTP_PROTO_VERSION); |
| 330 | sftp_send(pktout); |
| 331 | |
| 332 | pktin = sftp_recv(); |
| 333 | if (!pktin) { |
| 334 | fxp_internal_error("could not connect"); |
| 335 | return 0; |
| 336 | } |
| 337 | if (pktin->type != SSH_FXP_VERSION) { |
| 338 | fxp_internal_error("did not receive FXP_VERSION"); |
| 339 | return 0; |
| 340 | } |
| 341 | remotever = sftp_pkt_getuint32(pktin); |
| 342 | if (remotever > SFTP_PROTO_VERSION) { |
| 343 | fxp_internal_error |
| 344 | ("remote protocol is more advanced than we support"); |
| 345 | return 0; |
| 346 | } |
| 347 | /* |
| 348 | * In principle, this packet might also contain extension- |
| 349 | * string pairs. We should work through them and look for any |
| 350 | * we recognise. In practice we don't currently do so because |
| 351 | * we know we don't recognise _any_. |
| 352 | */ |
| 353 | sftp_pkt_free(pktin); |
| 354 | |
| 355 | return 1; |
| 356 | } |
| 357 | |
| 358 | /* |
| 359 | * Canonify a pathname. |
| 360 | */ |
| 361 | char *fxp_realpath(char *path) |
| 362 | { |
| 363 | struct sftp_packet *pktin, *pktout; |
| 364 | int id; |
| 365 | |
| 366 | pktout = sftp_pkt_init(SSH_FXP_REALPATH); |
| 367 | sftp_pkt_adduint32(pktout, 0x123); /* request id */ |
| 368 | sftp_pkt_addstring_start(pktout); |
| 369 | sftp_pkt_addstring_str(pktout, path); |
| 370 | sftp_send(pktout); |
| 371 | pktin = sftp_recv(); |
| 372 | if (!pktin) { |
| 373 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 374 | return NULL; |
| 375 | } |
| 376 | id = sftp_pkt_getuint32(pktin); |
| 377 | if (id != 0x123) { |
| 378 | fxp_internal_error("request ID mismatch\n"); |
| 379 | return NULL; |
| 380 | } |
| 381 | if (pktin->type == SSH_FXP_NAME) { |
| 382 | int count; |
| 383 | char *path; |
| 384 | int len; |
| 385 | |
| 386 | count = sftp_pkt_getuint32(pktin); |
| 387 | if (count != 1) { |
| 388 | fxp_internal_error("REALPATH returned name count != 1\n"); |
| 389 | return NULL; |
| 390 | } |
| 391 | sftp_pkt_getstring(pktin, &path, &len); |
| 392 | if (!path) { |
| 393 | fxp_internal_error("REALPATH returned malformed FXP_NAME\n"); |
| 394 | return NULL; |
| 395 | } |
| 396 | path = mkstr(path, len); |
| 397 | sftp_pkt_free(pktin); |
| 398 | return path; |
| 399 | } else { |
| 400 | fxp_got_status(pktin); |
| 401 | return NULL; |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | /* |
| 406 | * Open a file. |
| 407 | */ |
| 408 | struct fxp_handle *fxp_open(char *path, int type) |
| 409 | { |
| 410 | struct sftp_packet *pktin, *pktout; |
| 411 | int id; |
| 412 | |
| 413 | pktout = sftp_pkt_init(SSH_FXP_OPEN); |
| 414 | sftp_pkt_adduint32(pktout, 0x567); /* request id */ |
| 415 | sftp_pkt_addstring(pktout, path); |
| 416 | sftp_pkt_adduint32(pktout, type); |
| 417 | sftp_pkt_adduint32(pktout, 0); /* (FIXME) empty ATTRS structure */ |
| 418 | sftp_send(pktout); |
| 419 | pktin = sftp_recv(); |
| 420 | if (!pktin) { |
| 421 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 422 | return NULL; |
| 423 | } |
| 424 | id = sftp_pkt_getuint32(pktin); |
| 425 | if (id != 0x567) { |
| 426 | fxp_internal_error("request ID mismatch\n"); |
| 427 | return NULL; |
| 428 | } |
| 429 | if (pktin->type == SSH_FXP_HANDLE) { |
| 430 | char *hstring; |
| 431 | struct fxp_handle *handle; |
| 432 | int len; |
| 433 | |
| 434 | sftp_pkt_getstring(pktin, &hstring, &len); |
| 435 | if (!hstring) { |
| 436 | fxp_internal_error("OPEN returned malformed FXP_HANDLE\n"); |
| 437 | return NULL; |
| 438 | } |
| 439 | handle = smalloc(sizeof(struct fxp_handle)); |
| 440 | handle->hstring = mkstr(hstring, len); |
| 441 | handle->hlen = len; |
| 442 | sftp_pkt_free(pktin); |
| 443 | return handle; |
| 444 | } else { |
| 445 | fxp_got_status(pktin); |
| 446 | return NULL; |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | /* |
| 451 | * Open a directory. |
| 452 | */ |
| 453 | struct fxp_handle *fxp_opendir(char *path) |
| 454 | { |
| 455 | struct sftp_packet *pktin, *pktout; |
| 456 | int id; |
| 457 | |
| 458 | pktout = sftp_pkt_init(SSH_FXP_OPENDIR); |
| 459 | sftp_pkt_adduint32(pktout, 0x456); /* request id */ |
| 460 | sftp_pkt_addstring(pktout, path); |
| 461 | sftp_send(pktout); |
| 462 | pktin = sftp_recv(); |
| 463 | if (!pktin) { |
| 464 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 465 | return NULL; |
| 466 | } |
| 467 | id = sftp_pkt_getuint32(pktin); |
| 468 | if (id != 0x456) { |
| 469 | fxp_internal_error("request ID mismatch\n"); |
| 470 | return NULL; |
| 471 | } |
| 472 | if (pktin->type == SSH_FXP_HANDLE) { |
| 473 | char *hstring; |
| 474 | struct fxp_handle *handle; |
| 475 | int len; |
| 476 | |
| 477 | sftp_pkt_getstring(pktin, &hstring, &len); |
| 478 | if (!hstring) { |
| 479 | fxp_internal_error("OPENDIR returned malformed FXP_HANDLE\n"); |
| 480 | return NULL; |
| 481 | } |
| 482 | handle = smalloc(sizeof(struct fxp_handle)); |
| 483 | handle->hstring = mkstr(hstring, len); |
| 484 | handle->hlen = len; |
| 485 | sftp_pkt_free(pktin); |
| 486 | return handle; |
| 487 | } else { |
| 488 | fxp_got_status(pktin); |
| 489 | return NULL; |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * Close a file/dir. |
| 495 | */ |
| 496 | void fxp_close(struct fxp_handle *handle) |
| 497 | { |
| 498 | struct sftp_packet *pktin, *pktout; |
| 499 | int id; |
| 500 | |
| 501 | pktout = sftp_pkt_init(SSH_FXP_CLOSE); |
| 502 | sftp_pkt_adduint32(pktout, 0x789); /* request id */ |
| 503 | sftp_pkt_addstring_start(pktout); |
| 504 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 505 | sftp_send(pktout); |
| 506 | pktin = sftp_recv(); |
| 507 | if (!pktin) { |
| 508 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 509 | return; |
| 510 | } |
| 511 | id = sftp_pkt_getuint32(pktin); |
| 512 | if (id != 0x789) { |
| 513 | fxp_internal_error("request ID mismatch\n"); |
| 514 | return; |
| 515 | } |
| 516 | fxp_got_status(pktin); |
| 517 | sfree(handle->hstring); |
| 518 | sfree(handle); |
| 519 | } |
| 520 | |
| 521 | int fxp_mkdir(char *path) |
| 522 | { |
| 523 | struct sftp_packet *pktin, *pktout; |
| 524 | int id; |
| 525 | |
| 526 | pktout = sftp_pkt_init(SSH_FXP_MKDIR); |
| 527 | sftp_pkt_adduint32(pktout, 0x234); /* request id */ |
| 528 | sftp_pkt_addstring(pktout, path); |
| 529 | sftp_pkt_adduint32(pktout, 0); /* (FIXME) empty ATTRS structure */ |
| 530 | sftp_send(pktout); |
| 531 | pktin = sftp_recv(); |
| 532 | if (!pktin) { |
| 533 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 534 | return 0; |
| 535 | } |
| 536 | id = sftp_pkt_getuint32(pktin); |
| 537 | if (id != 0x234) { |
| 538 | fxp_internal_error("request ID mismatch\n"); |
| 539 | return 0; |
| 540 | } |
| 541 | id = fxp_got_status(pktin); |
| 542 | if (id != 1) { |
| 543 | return 0; |
| 544 | } |
| 545 | return 1; |
| 546 | } |
| 547 | |
| 548 | int fxp_rmdir(char *path) |
| 549 | { |
| 550 | struct sftp_packet *pktin, *pktout; |
| 551 | int id; |
| 552 | |
| 553 | pktout = sftp_pkt_init(SSH_FXP_RMDIR); |
| 554 | sftp_pkt_adduint32(pktout, 0x345); /* request id */ |
| 555 | sftp_pkt_addstring(pktout, path); |
| 556 | sftp_send(pktout); |
| 557 | pktin = sftp_recv(); |
| 558 | if (!pktin) { |
| 559 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 560 | return 0; |
| 561 | } |
| 562 | id = sftp_pkt_getuint32(pktin); |
| 563 | if (id != 0x345) { |
| 564 | fxp_internal_error("request ID mismatch\n"); |
| 565 | return 0; |
| 566 | } |
| 567 | id = fxp_got_status(pktin); |
| 568 | if (id != 1) { |
| 569 | return 0; |
| 570 | } |
| 571 | return 1; |
| 572 | } |
| 573 | |
| 574 | int fxp_remove(char *fname) |
| 575 | { |
| 576 | struct sftp_packet *pktin, *pktout; |
| 577 | int id; |
| 578 | |
| 579 | pktout = sftp_pkt_init(SSH_FXP_REMOVE); |
| 580 | sftp_pkt_adduint32(pktout, 0x678); /* request id */ |
| 581 | sftp_pkt_addstring(pktout, fname); |
| 582 | sftp_send(pktout); |
| 583 | pktin = sftp_recv(); |
| 584 | if (!pktin) { |
| 585 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 586 | return 0; |
| 587 | } |
| 588 | id = sftp_pkt_getuint32(pktin); |
| 589 | if (id != 0x678) { |
| 590 | fxp_internal_error("request ID mismatch\n"); |
| 591 | return 0; |
| 592 | } |
| 593 | id = fxp_got_status(pktin); |
| 594 | if (id != 1) { |
| 595 | return 0; |
| 596 | } |
| 597 | return 1; |
| 598 | } |
| 599 | |
| 600 | int fxp_rename(char *srcfname, char *dstfname) |
| 601 | { |
| 602 | struct sftp_packet *pktin, *pktout; |
| 603 | int id; |
| 604 | |
| 605 | pktout = sftp_pkt_init(SSH_FXP_RENAME); |
| 606 | sftp_pkt_adduint32(pktout, 0x678); /* request id */ |
| 607 | sftp_pkt_addstring(pktout, srcfname); |
| 608 | sftp_pkt_addstring(pktout, dstfname); |
| 609 | sftp_send(pktout); |
| 610 | pktin = sftp_recv(); |
| 611 | if (!pktin) { |
| 612 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 613 | return 0; |
| 614 | } |
| 615 | id = sftp_pkt_getuint32(pktin); |
| 616 | if (id != 0x678) { |
| 617 | fxp_internal_error("request ID mismatch\n"); |
| 618 | return 0; |
| 619 | } |
| 620 | id = fxp_got_status(pktin); |
| 621 | if (id != 1) { |
| 622 | return 0; |
| 623 | } |
| 624 | return 1; |
| 625 | } |
| 626 | |
| 627 | /* |
| 628 | * Retrieve the attributes of a file. We have fxp_stat which works |
| 629 | * on filenames, and fxp_fstat which works on open file handles. |
| 630 | */ |
| 631 | int fxp_stat(char *fname, struct fxp_attrs *attrs) |
| 632 | { |
| 633 | struct sftp_packet *pktin, *pktout; |
| 634 | int id; |
| 635 | |
| 636 | pktout = sftp_pkt_init(SSH_FXP_STAT); |
| 637 | sftp_pkt_adduint32(pktout, 0x678); /* request id */ |
| 638 | sftp_pkt_addstring(pktout, fname); |
| 639 | sftp_send(pktout); |
| 640 | pktin = sftp_recv(); |
| 641 | if (!pktin) { |
| 642 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 643 | return 0; |
| 644 | } |
| 645 | id = sftp_pkt_getuint32(pktin); |
| 646 | if (id != 0x678) { |
| 647 | fxp_internal_error("request ID mismatch\n"); |
| 648 | return 0; |
| 649 | } |
| 650 | |
| 651 | if (pktin->type == SSH_FXP_ATTRS) { |
| 652 | *attrs = sftp_pkt_getattrs(pktin); |
| 653 | return 1; |
| 654 | } else { |
| 655 | fxp_got_status(pktin); |
| 656 | return 0; |
| 657 | } |
| 658 | } |
| 659 | |
| 660 | int fxp_fstat(struct fxp_handle *handle, struct fxp_attrs *attrs) |
| 661 | { |
| 662 | struct sftp_packet *pktin, *pktout; |
| 663 | int id; |
| 664 | |
| 665 | pktout = sftp_pkt_init(SSH_FXP_FSTAT); |
| 666 | sftp_pkt_adduint32(pktout, 0x678); /* request id */ |
| 667 | sftp_pkt_addstring_start(pktout); |
| 668 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 669 | sftp_send(pktout); |
| 670 | pktin = sftp_recv(); |
| 671 | if (!pktin) { |
| 672 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 673 | return 0; |
| 674 | } |
| 675 | id = sftp_pkt_getuint32(pktin); |
| 676 | if (id != 0x678) { |
| 677 | fxp_internal_error("request ID mismatch\n"); |
| 678 | return 0; |
| 679 | } |
| 680 | |
| 681 | if (pktin->type == SSH_FXP_ATTRS) { |
| 682 | *attrs = sftp_pkt_getattrs(pktin); |
| 683 | return 1; |
| 684 | } else { |
| 685 | fxp_got_status(pktin); |
| 686 | return 0; |
| 687 | } |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * Set the attributes of a file. |
| 692 | */ |
| 693 | int fxp_setstat(char *fname, struct fxp_attrs attrs) |
| 694 | { |
| 695 | struct sftp_packet *pktin, *pktout; |
| 696 | int id; |
| 697 | |
| 698 | pktout = sftp_pkt_init(SSH_FXP_SETSTAT); |
| 699 | sftp_pkt_adduint32(pktout, 0x678); /* request id */ |
| 700 | sftp_pkt_addstring(pktout, fname); |
| 701 | sftp_pkt_addattrs(pktout, attrs); |
| 702 | sftp_send(pktout); |
| 703 | pktin = sftp_recv(); |
| 704 | if (!pktin) { |
| 705 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 706 | return 0; |
| 707 | } |
| 708 | id = sftp_pkt_getuint32(pktin); |
| 709 | if (id != 0x678) { |
| 710 | fxp_internal_error("request ID mismatch\n"); |
| 711 | return 0; |
| 712 | } |
| 713 | id = fxp_got_status(pktin); |
| 714 | if (id != 1) { |
| 715 | return 0; |
| 716 | } |
| 717 | return 1; |
| 718 | } |
| 719 | int fxp_fsetstat(struct fxp_handle *handle, struct fxp_attrs attrs) |
| 720 | { |
| 721 | struct sftp_packet *pktin, *pktout; |
| 722 | int id; |
| 723 | |
| 724 | pktout = sftp_pkt_init(SSH_FXP_FSETSTAT); |
| 725 | sftp_pkt_adduint32(pktout, 0x678); /* request id */ |
| 726 | sftp_pkt_addstring_start(pktout); |
| 727 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 728 | sftp_pkt_addattrs(pktout, attrs); |
| 729 | sftp_send(pktout); |
| 730 | pktin = sftp_recv(); |
| 731 | if (!pktin) { |
| 732 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 733 | return 0; |
| 734 | } |
| 735 | id = sftp_pkt_getuint32(pktin); |
| 736 | if (id != 0x678) { |
| 737 | fxp_internal_error("request ID mismatch\n"); |
| 738 | return 0; |
| 739 | } |
| 740 | id = fxp_got_status(pktin); |
| 741 | if (id != 1) { |
| 742 | return 0; |
| 743 | } |
| 744 | return 1; |
| 745 | } |
| 746 | |
| 747 | /* |
| 748 | * Read from a file. Returns the number of bytes read, or -1 on an |
| 749 | * error, or possibly 0 if EOF. (I'm not entirely sure whether it |
| 750 | * will return 0 on EOF, or return -1 and store SSH_FX_EOF in the |
| 751 | * error indicator. It might even depend on the SFTP server.) |
| 752 | */ |
| 753 | int fxp_read(struct fxp_handle *handle, char *buffer, uint64 offset, |
| 754 | int len) |
| 755 | { |
| 756 | struct sftp_packet *pktin, *pktout; |
| 757 | int id; |
| 758 | |
| 759 | pktout = sftp_pkt_init(SSH_FXP_READ); |
| 760 | sftp_pkt_adduint32(pktout, 0xBCD); /* request id */ |
| 761 | sftp_pkt_addstring_start(pktout); |
| 762 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 763 | sftp_pkt_adduint64(pktout, offset); |
| 764 | sftp_pkt_adduint32(pktout, len); |
| 765 | sftp_send(pktout); |
| 766 | pktin = sftp_recv(); |
| 767 | if (!pktin) { |
| 768 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 769 | return -1; |
| 770 | } |
| 771 | id = sftp_pkt_getuint32(pktin); |
| 772 | if (id != 0xBCD) { |
| 773 | fxp_internal_error("request ID mismatch"); |
| 774 | return -1; |
| 775 | } |
| 776 | if (pktin->type == SSH_FXP_DATA) { |
| 777 | char *str; |
| 778 | int rlen; |
| 779 | |
| 780 | sftp_pkt_getstring(pktin, &str, &rlen); |
| 781 | |
| 782 | if (rlen > len || rlen < 0) { |
| 783 | fxp_internal_error("READ returned more bytes than requested"); |
| 784 | return -1; |
| 785 | } |
| 786 | |
| 787 | memcpy(buffer, str, rlen); |
| 788 | sfree(pktin); |
| 789 | return rlen; |
| 790 | } else { |
| 791 | fxp_got_status(pktin); |
| 792 | return -1; |
| 793 | } |
| 794 | } |
| 795 | |
| 796 | /* |
| 797 | * Read from a directory. |
| 798 | */ |
| 799 | struct fxp_names *fxp_readdir(struct fxp_handle *handle) |
| 800 | { |
| 801 | struct sftp_packet *pktin, *pktout; |
| 802 | int id; |
| 803 | |
| 804 | pktout = sftp_pkt_init(SSH_FXP_READDIR); |
| 805 | sftp_pkt_adduint32(pktout, 0xABC); /* request id */ |
| 806 | sftp_pkt_addstring_start(pktout); |
| 807 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 808 | sftp_send(pktout); |
| 809 | pktin = sftp_recv(); |
| 810 | if (!pktin) { |
| 811 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 812 | return NULL; |
| 813 | } |
| 814 | id = sftp_pkt_getuint32(pktin); |
| 815 | if (id != 0xABC) { |
| 816 | fxp_internal_error("request ID mismatch\n"); |
| 817 | return NULL; |
| 818 | } |
| 819 | if (pktin->type == SSH_FXP_NAME) { |
| 820 | struct fxp_names *ret; |
| 821 | int i; |
| 822 | ret = smalloc(sizeof(struct fxp_names)); |
| 823 | ret->nnames = sftp_pkt_getuint32(pktin); |
| 824 | ret->names = smalloc(ret->nnames * sizeof(struct fxp_name)); |
| 825 | for (i = 0; i < ret->nnames; i++) { |
| 826 | char *str; |
| 827 | int len; |
| 828 | sftp_pkt_getstring(pktin, &str, &len); |
| 829 | ret->names[i].filename = mkstr(str, len); |
| 830 | sftp_pkt_getstring(pktin, &str, &len); |
| 831 | ret->names[i].longname = mkstr(str, len); |
| 832 | ret->names[i].attrs = sftp_pkt_getattrs(pktin); |
| 833 | } |
| 834 | return ret; |
| 835 | } else { |
| 836 | fxp_got_status(pktin); |
| 837 | return NULL; |
| 838 | } |
| 839 | } |
| 840 | |
| 841 | /* |
| 842 | * Write to a file. Returns 0 on error, 1 on OK. |
| 843 | */ |
| 844 | int fxp_write(struct fxp_handle *handle, char *buffer, uint64 offset, |
| 845 | int len) |
| 846 | { |
| 847 | struct sftp_packet *pktin, *pktout; |
| 848 | int id; |
| 849 | |
| 850 | pktout = sftp_pkt_init(SSH_FXP_WRITE); |
| 851 | sftp_pkt_adduint32(pktout, 0xDCB); /* request id */ |
| 852 | sftp_pkt_addstring_start(pktout); |
| 853 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
| 854 | sftp_pkt_adduint64(pktout, offset); |
| 855 | sftp_pkt_addstring_start(pktout); |
| 856 | sftp_pkt_addstring_data(pktout, buffer, len); |
| 857 | sftp_send(pktout); |
| 858 | pktin = sftp_recv(); |
| 859 | if (!pktin) { |
| 860 | fxp_internal_error("did not receive a valid SFTP packet\n"); |
| 861 | return 0; |
| 862 | } |
| 863 | id = sftp_pkt_getuint32(pktin); |
| 864 | if (id != 0xDCB) { |
| 865 | fxp_internal_error("request ID mismatch\n"); |
| 866 | return 0; |
| 867 | } |
| 868 | fxp_got_status(pktin); |
| 869 | return fxp_errtype == SSH_FX_OK; |
| 870 | } |
| 871 | |
| 872 | /* |
| 873 | * Free up an fxp_names structure. |
| 874 | */ |
| 875 | void fxp_free_names(struct fxp_names *names) |
| 876 | { |
| 877 | int i; |
| 878 | |
| 879 | for (i = 0; i < names->nnames; i++) { |
| 880 | sfree(names->names[i].filename); |
| 881 | sfree(names->names[i].longname); |
| 882 | } |
| 883 | sfree(names->names); |
| 884 | sfree(names); |
| 885 | } |