| 1 | /* |
| 2 | * psftp.c: front end for PSFTP. |
| 3 | */ |
| 4 | |
| 5 | #include <windows.h> |
| 6 | |
| 7 | #include <stdio.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <stdarg.h> |
| 10 | #include <assert.h> |
| 11 | |
| 12 | #define PUTTY_DO_GLOBALS |
| 13 | #include "putty.h" |
| 14 | #include "storage.h" |
| 15 | #include "ssh.h" |
| 16 | #include "sftp.h" |
| 17 | #include "int64.h" |
| 18 | |
| 19 | /* ---------------------------------------------------------------------- |
| 20 | * String handling routines. |
| 21 | */ |
| 22 | |
| 23 | char *dupstr(char *s) { |
| 24 | int len = strlen(s); |
| 25 | char *p = smalloc(len+1); |
| 26 | strcpy(p, s); |
| 27 | return p; |
| 28 | } |
| 29 | |
| 30 | /* Allocate the concatenation of N strings. Terminate arg list with NULL. */ |
| 31 | char *dupcat(char *s1, ...) { |
| 32 | int len; |
| 33 | char *p, *q, *sn; |
| 34 | va_list ap; |
| 35 | |
| 36 | len = strlen(s1); |
| 37 | va_start(ap, s1); |
| 38 | while (1) { |
| 39 | sn = va_arg(ap, char *); |
| 40 | if (!sn) |
| 41 | break; |
| 42 | len += strlen(sn); |
| 43 | } |
| 44 | va_end(ap); |
| 45 | |
| 46 | p = smalloc(len+1); |
| 47 | strcpy(p, s1); |
| 48 | q = p + strlen(p); |
| 49 | |
| 50 | va_start(ap, s1); |
| 51 | while (1) { |
| 52 | sn = va_arg(ap, char *); |
| 53 | if (!sn) |
| 54 | break; |
| 55 | strcpy(q, sn); |
| 56 | q += strlen(q); |
| 57 | } |
| 58 | va_end(ap); |
| 59 | |
| 60 | return p; |
| 61 | } |
| 62 | |
| 63 | /* ---------------------------------------------------------------------- |
| 64 | * sftp client state. |
| 65 | */ |
| 66 | |
| 67 | char *pwd, *homedir; |
| 68 | |
| 69 | /* ---------------------------------------------------------------------- |
| 70 | * Higher-level helper functions used in commands. |
| 71 | */ |
| 72 | |
| 73 | /* |
| 74 | * Attempt to canonify a pathname starting from the pwd. If |
| 75 | * canonification fails, at least fall back to returning a _valid_ |
| 76 | * pathname (though it may be ugly, eg /home/simon/../foobar). |
| 77 | */ |
| 78 | char *canonify(char *name) { |
| 79 | char *fullname, *canonname; |
| 80 | |
| 81 | if (name[0] == '/') { |
| 82 | fullname = dupstr(name); |
| 83 | } else { |
| 84 | char *slash; |
| 85 | if (pwd[strlen(pwd)-1] == '/') |
| 86 | slash = ""; |
| 87 | else |
| 88 | slash = "/"; |
| 89 | fullname = dupcat(pwd, slash, name, NULL); |
| 90 | } |
| 91 | |
| 92 | canonname = fxp_realpath(fullname); |
| 93 | |
| 94 | if (canonname) { |
| 95 | sfree(fullname); |
| 96 | return canonname; |
| 97 | } else { |
| 98 | /* |
| 99 | * Attempt number 2. Some FXP_REALPATH implementations |
| 100 | * (glibc-based ones, in particular) require the _whole_ |
| 101 | * path to point to something that exists, whereas others |
| 102 | * (BSD-based) only require all but the last component to |
| 103 | * exist. So if the first call failed, we should strip off |
| 104 | * everything from the last slash onwards and try again, |
| 105 | * then put the final component back on. |
| 106 | * |
| 107 | * Special cases: |
| 108 | * |
| 109 | * - if the last component is "/." or "/..", then we don't |
| 110 | * bother trying this because there's no way it can work. |
| 111 | * |
| 112 | * - if the thing actually ends with a "/", we remove it |
| 113 | * before we start. Except if the string is "/" itself |
| 114 | * (although I can't see why we'd have got here if so, |
| 115 | * because surely "/" would have worked the first |
| 116 | * time?), in which case we don't bother. |
| 117 | * |
| 118 | * - if there's no slash in the string at all, give up in |
| 119 | * confusion (we expect at least one because of the way |
| 120 | * we constructed the string). |
| 121 | */ |
| 122 | |
| 123 | int i; |
| 124 | char *returnname; |
| 125 | |
| 126 | i = strlen(fullname); |
| 127 | if (i > 2 && fullname[i-1] == '/') |
| 128 | fullname[--i] = '\0'; /* strip trailing / unless at pos 0 */ |
| 129 | while (i > 0 && fullname[--i] != '/'); |
| 130 | |
| 131 | /* |
| 132 | * Give up on special cases. |
| 133 | */ |
| 134 | if (fullname[i] != '/' || /* no slash at all */ |
| 135 | !strcmp(fullname+i, "/.") || /* ends in /. */ |
| 136 | !strcmp(fullname+i, "/..") || /* ends in /.. */ |
| 137 | !strcmp(fullname, "/")) { |
| 138 | return fullname; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * Now i points at the slash. Deal with the final special |
| 143 | * case i==0 (ie the whole path was "/nonexistentfile"). |
| 144 | */ |
| 145 | fullname[i] = '\0'; /* separate the string */ |
| 146 | if (i == 0) { |
| 147 | canonname = fxp_realpath("/"); |
| 148 | } else { |
| 149 | canonname = fxp_realpath(fullname); |
| 150 | } |
| 151 | |
| 152 | if (!canonname) |
| 153 | return fullname; /* even that failed; give up */ |
| 154 | |
| 155 | /* |
| 156 | * We have a canonical name for all but the last path |
| 157 | * component. Concatenate the last component and return. |
| 158 | */ |
| 159 | returnname = dupcat(canonname, |
| 160 | canonname[strlen(canonname)-1] == '/' ? "" : "/", |
| 161 | fullname+i+1, NULL); |
| 162 | sfree(fullname); |
| 163 | sfree(canonname); |
| 164 | return returnname; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | /* ---------------------------------------------------------------------- |
| 169 | * Actual sftp commands. |
| 170 | */ |
| 171 | struct sftp_command { |
| 172 | char **words; |
| 173 | int nwords, wordssize; |
| 174 | int (*obey)(struct sftp_command *);/* returns <0 to quit */ |
| 175 | }; |
| 176 | |
| 177 | int sftp_cmd_null(struct sftp_command *cmd) { |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | int sftp_cmd_unknown(struct sftp_command *cmd) { |
| 182 | printf("psftp: unknown command \"%s\"\n", cmd->words[0]); |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | int sftp_cmd_quit(struct sftp_command *cmd) { |
| 187 | return -1; |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * List a directory. If no arguments are given, list pwd; otherwise |
| 192 | * list the directory given in words[1]. |
| 193 | */ |
| 194 | static int sftp_ls_compare(const void *av, const void *bv) { |
| 195 | const struct fxp_name *a = (const struct fxp_name *)av; |
| 196 | const struct fxp_name *b = (const struct fxp_name *)bv; |
| 197 | return strcmp(a->filename, b->filename); |
| 198 | } |
| 199 | int sftp_cmd_ls(struct sftp_command *cmd) { |
| 200 | struct fxp_handle *dirh; |
| 201 | struct fxp_names *names; |
| 202 | struct fxp_name *ournames; |
| 203 | int nnames, namesize; |
| 204 | char *dir, *cdir; |
| 205 | int i; |
| 206 | |
| 207 | if (cmd->nwords < 2) |
| 208 | dir = "."; |
| 209 | else |
| 210 | dir = cmd->words[1]; |
| 211 | |
| 212 | cdir = canonify(dir); |
| 213 | if (!cdir) { |
| 214 | printf("%s: %s\n", dir, fxp_error()); |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | printf("Listing directory %s\n", cdir); |
| 219 | |
| 220 | dirh = fxp_opendir(cdir); |
| 221 | if (dirh == NULL) { |
| 222 | printf("Unable to open %s: %s\n", dir, fxp_error()); |
| 223 | } else { |
| 224 | nnames = namesize = 0; |
| 225 | ournames = NULL; |
| 226 | |
| 227 | while (1) { |
| 228 | |
| 229 | names = fxp_readdir(dirh); |
| 230 | if (names == NULL) { |
| 231 | if (fxp_error_type() == SSH_FX_EOF) |
| 232 | break; |
| 233 | printf("Reading directory %s: %s\n", dir, fxp_error()); |
| 234 | break; |
| 235 | } |
| 236 | if (names->nnames == 0) { |
| 237 | fxp_free_names(names); |
| 238 | break; |
| 239 | } |
| 240 | |
| 241 | if (nnames + names->nnames >= namesize) { |
| 242 | namesize += names->nnames + 128; |
| 243 | ournames = srealloc(ournames, namesize * sizeof(*ournames)); |
| 244 | } |
| 245 | |
| 246 | for (i = 0; i < names->nnames; i++) |
| 247 | ournames[nnames++] = names->names[i]; |
| 248 | |
| 249 | names->nnames = 0; /* prevent free_names */ |
| 250 | fxp_free_names(names); |
| 251 | } |
| 252 | fxp_close(dirh); |
| 253 | |
| 254 | /* |
| 255 | * Now we have our filenames. Sort them by actual file |
| 256 | * name, and then output the longname parts. |
| 257 | */ |
| 258 | qsort(ournames, nnames, sizeof(*ournames), sftp_ls_compare); |
| 259 | |
| 260 | /* |
| 261 | * And print them. |
| 262 | */ |
| 263 | for (i = 0; i < nnames; i++) |
| 264 | printf("%s\n", ournames[i].longname); |
| 265 | } |
| 266 | |
| 267 | sfree(cdir); |
| 268 | |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | /* |
| 273 | * Change directories. We do this by canonifying the new name, then |
| 274 | * trying to OPENDIR it. Only if that succeeds do we set the new pwd. |
| 275 | */ |
| 276 | int sftp_cmd_cd(struct sftp_command *cmd) { |
| 277 | struct fxp_handle *dirh; |
| 278 | char *dir; |
| 279 | |
| 280 | if (cmd->nwords < 2) |
| 281 | dir = dupstr(homedir); |
| 282 | else |
| 283 | dir = canonify(cmd->words[1]); |
| 284 | |
| 285 | if (!dir) { |
| 286 | printf("%s: %s\n", dir, fxp_error()); |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | dirh = fxp_opendir(dir); |
| 291 | if (!dirh) { |
| 292 | printf("Directory %s: %s\n", dir, fxp_error()); |
| 293 | sfree(dir); |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | fxp_close(dirh); |
| 298 | |
| 299 | sfree(pwd); |
| 300 | pwd = dir; |
| 301 | printf("Remote directory is now %s\n", pwd); |
| 302 | |
| 303 | return 0; |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * Get a file and save it at the local end. |
| 308 | */ |
| 309 | int sftp_cmd_get(struct sftp_command *cmd) { |
| 310 | struct fxp_handle *fh; |
| 311 | char *fname, *outfname; |
| 312 | uint64 offset; |
| 313 | FILE *fp; |
| 314 | |
| 315 | if (cmd->nwords < 2) { |
| 316 | printf("get: expects a filename\n"); |
| 317 | return 0; |
| 318 | } |
| 319 | |
| 320 | fname = canonify(cmd->words[1]); |
| 321 | if (!fname) { |
| 322 | printf("%s: %s\n", cmd->words[1], fxp_error()); |
| 323 | return 0; |
| 324 | } |
| 325 | outfname = (cmd->nwords == 2 ? cmd->words[1] : cmd->words[2]); |
| 326 | |
| 327 | fh = fxp_open(fname, SSH_FXF_READ); |
| 328 | if (!fh) { |
| 329 | printf("%s: %s\n", fname, fxp_error()); |
| 330 | sfree(fname); |
| 331 | return 0; |
| 332 | } |
| 333 | fp = fopen(outfname, "wb"); |
| 334 | if (!fp) { |
| 335 | printf("local: unable to open %s\n", outfname); |
| 336 | fxp_close(fh); |
| 337 | sfree(fname); |
| 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | printf("remote:%s => local:%s\n", fname, outfname); |
| 342 | |
| 343 | offset = uint64_make(0,0); |
| 344 | |
| 345 | /* |
| 346 | * FIXME: we can use FXP_FSTAT here to get the file size, and |
| 347 | * thus put up a progress bar. |
| 348 | */ |
| 349 | while (1) { |
| 350 | char buffer[4096]; |
| 351 | int len; |
| 352 | int wpos, wlen; |
| 353 | |
| 354 | len = fxp_read(fh, buffer, offset, sizeof(buffer)); |
| 355 | if ((len == -1 && fxp_error_type() == SSH_FX_EOF) || |
| 356 | len == 0) |
| 357 | break; |
| 358 | if (len == -1) { |
| 359 | printf("error while reading: %s\n", fxp_error()); |
| 360 | break; |
| 361 | } |
| 362 | |
| 363 | wpos = 0; |
| 364 | while (wpos < len) { |
| 365 | wlen = fwrite(buffer, 1, len-wpos, fp); |
| 366 | if (wlen <= 0) { |
| 367 | printf("error while writing local file\n"); |
| 368 | break; |
| 369 | } |
| 370 | wpos += wlen; |
| 371 | } |
| 372 | if (wpos < len) /* we had an error */ |
| 373 | break; |
| 374 | offset = uint64_add32(offset, len); |
| 375 | } |
| 376 | |
| 377 | fclose(fp); |
| 378 | fxp_close(fh); |
| 379 | sfree(fname); |
| 380 | |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * Send a file and store it at the remote end. |
| 386 | */ |
| 387 | int sftp_cmd_put(struct sftp_command *cmd) { |
| 388 | struct fxp_handle *fh; |
| 389 | char *fname, *origoutfname, *outfname; |
| 390 | uint64 offset; |
| 391 | FILE *fp; |
| 392 | |
| 393 | if (cmd->nwords < 2) { |
| 394 | printf("put: expects a filename\n"); |
| 395 | return 0; |
| 396 | } |
| 397 | |
| 398 | fname = cmd->words[1]; |
| 399 | origoutfname = (cmd->nwords == 2 ? cmd->words[1] : cmd->words[2]); |
| 400 | outfname = canonify(origoutfname); |
| 401 | if (!outfname) { |
| 402 | printf("%s: %s\n", origoutfname, fxp_error()); |
| 403 | return 0; |
| 404 | } |
| 405 | |
| 406 | fp = fopen(fname, "rb"); |
| 407 | if (!fp) { |
| 408 | printf("local: unable to open %s\n", fname); |
| 409 | sfree(outfname); |
| 410 | return 0; |
| 411 | } |
| 412 | fh = fxp_open(outfname, SSH_FXF_WRITE | SSH_FXF_CREAT | SSH_FXF_TRUNC); |
| 413 | if (!fh) { |
| 414 | printf("%s: %s\n", outfname, fxp_error()); |
| 415 | sfree(outfname); |
| 416 | return 0; |
| 417 | } |
| 418 | |
| 419 | printf("local:%s => remote:%s\n", fname, outfname); |
| 420 | |
| 421 | offset = uint64_make(0,0); |
| 422 | |
| 423 | /* |
| 424 | * FIXME: we can use FXP_FSTAT here to get the file size, and |
| 425 | * thus put up a progress bar. |
| 426 | */ |
| 427 | while (1) { |
| 428 | char buffer[4096]; |
| 429 | int len; |
| 430 | |
| 431 | len = fread(buffer, 1, sizeof(buffer), fp); |
| 432 | if (len == -1) { |
| 433 | printf("error while reading local file\n"); |
| 434 | break; |
| 435 | } else if (len == 0) { |
| 436 | break; |
| 437 | } |
| 438 | if (!fxp_write(fh, buffer, offset, len)) { |
| 439 | printf("error while writing: %s\n", fxp_error()); |
| 440 | break; |
| 441 | } |
| 442 | offset = uint64_add32(offset, len); |
| 443 | } |
| 444 | |
| 445 | fxp_close(fh); |
| 446 | fclose(fp); |
| 447 | sfree(outfname); |
| 448 | |
| 449 | return 0; |
| 450 | } |
| 451 | |
| 452 | static struct sftp_cmd_lookup { |
| 453 | char *name; |
| 454 | int (*obey)(struct sftp_command *); |
| 455 | } sftp_lookup[] = { |
| 456 | /* |
| 457 | * List of sftp commands. This is binary-searched so it MUST be |
| 458 | * in ASCII order. |
| 459 | */ |
| 460 | {"bye", sftp_cmd_quit}, |
| 461 | {"cd", sftp_cmd_cd}, |
| 462 | {"dir", sftp_cmd_ls}, |
| 463 | {"exit", sftp_cmd_quit}, |
| 464 | {"get", sftp_cmd_get}, |
| 465 | {"ls", sftp_cmd_ls}, |
| 466 | {"put", sftp_cmd_put}, |
| 467 | {"quit", sftp_cmd_quit}, |
| 468 | }; |
| 469 | |
| 470 | /* ---------------------------------------------------------------------- |
| 471 | * Command line reading and parsing. |
| 472 | */ |
| 473 | struct sftp_command *sftp_getcmd(void) { |
| 474 | char *line; |
| 475 | int linelen, linesize; |
| 476 | struct sftp_command *cmd; |
| 477 | char *p, *q, *r; |
| 478 | int quoting; |
| 479 | |
| 480 | printf("psftp> "); |
| 481 | fflush(stdout); |
| 482 | |
| 483 | cmd = smalloc(sizeof(struct sftp_command)); |
| 484 | cmd->words = NULL; |
| 485 | cmd->nwords = 0; |
| 486 | cmd->wordssize = 0; |
| 487 | |
| 488 | line = NULL; |
| 489 | linesize = linelen = 0; |
| 490 | while (1) { |
| 491 | int len; |
| 492 | char *ret; |
| 493 | |
| 494 | linesize += 512; |
| 495 | line = srealloc(line, linesize); |
| 496 | ret = fgets(line+linelen, linesize-linelen, stdin); |
| 497 | |
| 498 | if (!ret || (linelen == 0 && line[0] == '\0')) { |
| 499 | cmd->obey = sftp_cmd_quit; |
| 500 | printf("quit\n"); |
| 501 | return cmd; /* eof */ |
| 502 | } |
| 503 | len = linelen + strlen(line+linelen); |
| 504 | linelen += len; |
| 505 | if (line[linelen-1] == '\n') { |
| 506 | linelen--; |
| 507 | line[linelen] = '\0'; |
| 508 | break; |
| 509 | } |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * Parse the command line into words. The syntax is: |
| 514 | * - double quotes are removed, but cause spaces within to be |
| 515 | * treated as non-separating. |
| 516 | * - a double-doublequote pair is a literal double quote, inside |
| 517 | * _or_ outside quotes. Like this: |
| 518 | * |
| 519 | * firstword "second word" "this has ""quotes"" in" sodoes""this"" |
| 520 | * |
| 521 | * becomes |
| 522 | * |
| 523 | * >firstword< |
| 524 | * >second word< |
| 525 | * >this has "quotes" in< |
| 526 | * >sodoes"this"< |
| 527 | */ |
| 528 | p = line; |
| 529 | while (*p) { |
| 530 | /* skip whitespace */ |
| 531 | while (*p && (*p == ' ' || *p == '\t')) p++; |
| 532 | /* mark start of word */ |
| 533 | q = r = p; /* q sits at start, r writes word */ |
| 534 | quoting = 0; |
| 535 | while (*p) { |
| 536 | if (!quoting && (*p == ' ' || *p == '\t')) |
| 537 | break; /* reached end of word */ |
| 538 | else if (*p == '"' && p[1] == '"') |
| 539 | p+=2, *r++ = '"'; /* a literal quote */ |
| 540 | else if (*p == '"') |
| 541 | p++, quoting = !quoting; |
| 542 | else |
| 543 | *r++ = *p++; |
| 544 | } |
| 545 | if (*p) p++; /* skip over the whitespace */ |
| 546 | *r = '\0'; |
| 547 | if (cmd->nwords >= cmd->wordssize) { |
| 548 | cmd->wordssize = cmd->nwords + 16; |
| 549 | cmd->words = srealloc(cmd->words, cmd->wordssize*sizeof(char *)); |
| 550 | } |
| 551 | cmd->words[cmd->nwords++] = q; |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * Now parse the first word and assign a function. |
| 556 | */ |
| 557 | |
| 558 | if (cmd->nwords == 0) |
| 559 | cmd->obey = sftp_cmd_null; |
| 560 | else { |
| 561 | int i, j, k, cmp; |
| 562 | |
| 563 | cmd->obey = sftp_cmd_unknown; |
| 564 | |
| 565 | i = -1; |
| 566 | j = sizeof(sftp_lookup) / sizeof(*sftp_lookup); |
| 567 | while (j - i > 1) { |
| 568 | k = (j + i) / 2; |
| 569 | cmp = strcmp(cmd->words[0], sftp_lookup[k].name); |
| 570 | if (cmp < 0) |
| 571 | j = k; |
| 572 | else if (cmp > 0) |
| 573 | i = k; |
| 574 | else { |
| 575 | cmd->obey = sftp_lookup[k].obey; |
| 576 | break; |
| 577 | } |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | return cmd; |
| 582 | } |
| 583 | |
| 584 | void do_sftp(void) { |
| 585 | /* |
| 586 | * Do protocol initialisation. |
| 587 | */ |
| 588 | if (!fxp_init()) { |
| 589 | fprintf(stderr, |
| 590 | "Fatal: unable to initialise SFTP: %s\n", |
| 591 | fxp_error()); |
| 592 | return; |
| 593 | } |
| 594 | |
| 595 | /* |
| 596 | * Find out where our home directory is. |
| 597 | */ |
| 598 | homedir = fxp_realpath("."); |
| 599 | if (!homedir) { |
| 600 | fprintf(stderr, |
| 601 | "Warning: failed to resolve home directory: %s\n", |
| 602 | fxp_error()); |
| 603 | homedir = dupstr("."); |
| 604 | } else { |
| 605 | printf("Remote working directory is %s\n", homedir); |
| 606 | } |
| 607 | pwd = dupstr(homedir); |
| 608 | |
| 609 | /* ------------------------------------------------------------------ |
| 610 | * Now we're ready to do Real Stuff. |
| 611 | */ |
| 612 | while (1) { |
| 613 | struct sftp_command *cmd; |
| 614 | cmd = sftp_getcmd(); |
| 615 | if (!cmd) |
| 616 | break; |
| 617 | if (cmd->obey(cmd) < 0) |
| 618 | break; |
| 619 | } |
| 620 | } |
| 621 | |
| 622 | /* ---------------------------------------------------------------------- |
| 623 | * Dirty bits: integration with PuTTY. |
| 624 | */ |
| 625 | |
| 626 | static int verbose = 0; |
| 627 | |
| 628 | void verify_ssh_host_key(char *host, int port, char *keytype, |
| 629 | char *keystr, char *fingerprint) { |
| 630 | int ret; |
| 631 | |
| 632 | static const char absentmsg[] = |
| 633 | "The server's host key is not cached in the registry. You\n" |
| 634 | "have no guarantee that the server is the computer you\n" |
| 635 | "think it is.\n" |
| 636 | "The server's key fingerprint is:\n" |
| 637 | "%s\n" |
| 638 | "If you trust this host, enter \"y\" to add the key to\n" |
| 639 | "PuTTY's cache and carry on connecting.\n" |
| 640 | "If you do not trust this host, enter \"n\" to abandon the\n" |
| 641 | "connection.\n" |
| 642 | "Continue connecting? (y/n) "; |
| 643 | |
| 644 | static const char wrongmsg[] = |
| 645 | "WARNING - POTENTIAL SECURITY BREACH!\n" |
| 646 | "The server's host key does not match the one PuTTY has\n" |
| 647 | "cached in the registry. This means that either the\n" |
| 648 | "server administrator has changed the host key, or you\n" |
| 649 | "have actually connected to another computer pretending\n" |
| 650 | "to be the server.\n" |
| 651 | "The new key fingerprint is:\n" |
| 652 | "%s\n" |
| 653 | "If you were expecting this change and trust the new key,\n" |
| 654 | "enter Yes to update PuTTY's cache and continue connecting.\n" |
| 655 | "If you want to carry on connecting but without updating\n" |
| 656 | "the cache, enter No.\n" |
| 657 | "If you want to abandon the connection completely, press\n" |
| 658 | "Return to cancel. Pressing Return is the ONLY guaranteed\n" |
| 659 | "safe choice.\n" |
| 660 | "Update cached key? (y/n, Return cancels connection) "; |
| 661 | |
| 662 | static const char abandoned[] = "Connection abandoned.\n"; |
| 663 | |
| 664 | char line[32]; |
| 665 | |
| 666 | /* |
| 667 | * Verify the key against the registry. |
| 668 | */ |
| 669 | ret = verify_host_key(host, port, keytype, keystr); |
| 670 | |
| 671 | if (ret == 0) /* success - key matched OK */ |
| 672 | return; |
| 673 | if (ret == 2) { /* key was different */ |
| 674 | fprintf(stderr, wrongmsg, fingerprint); |
| 675 | if (fgets(line, sizeof(line), stdin) && |
| 676 | line[0] != '\0' && line[0] != '\n') { |
| 677 | if (line[0] == 'y' || line[0] == 'Y') |
| 678 | store_host_key(host, port, keytype, keystr); |
| 679 | } else { |
| 680 | fprintf(stderr, abandoned); |
| 681 | exit(0); |
| 682 | } |
| 683 | } |
| 684 | if (ret == 1) { /* key was absent */ |
| 685 | fprintf(stderr, absentmsg, fingerprint); |
| 686 | if (fgets(line, sizeof(line), stdin) && |
| 687 | (line[0] == 'y' || line[0] == 'Y')) |
| 688 | store_host_key(host, port, keytype, keystr); |
| 689 | else { |
| 690 | fprintf(stderr, abandoned); |
| 691 | exit(0); |
| 692 | } |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | /* |
| 697 | * Print an error message and perform a fatal exit. |
| 698 | */ |
| 699 | void fatalbox(char *fmt, ...) |
| 700 | { |
| 701 | char str[0x100]; /* Make the size big enough */ |
| 702 | va_list ap; |
| 703 | va_start(ap, fmt); |
| 704 | strcpy(str, "Fatal:"); |
| 705 | vsprintf(str+strlen(str), fmt, ap); |
| 706 | va_end(ap); |
| 707 | strcat(str, "\n"); |
| 708 | fprintf(stderr, str); |
| 709 | |
| 710 | exit(1); |
| 711 | } |
| 712 | void connection_fatal(char *fmt, ...) |
| 713 | { |
| 714 | char str[0x100]; /* Make the size big enough */ |
| 715 | va_list ap; |
| 716 | va_start(ap, fmt); |
| 717 | strcpy(str, "Fatal:"); |
| 718 | vsprintf(str+strlen(str), fmt, ap); |
| 719 | va_end(ap); |
| 720 | strcat(str, "\n"); |
| 721 | fprintf(stderr, str); |
| 722 | |
| 723 | exit(1); |
| 724 | } |
| 725 | |
| 726 | void logevent(char *string) { } |
| 727 | |
| 728 | void ldisc_send(char *buf, int len) { |
| 729 | /* |
| 730 | * This is only here because of the calls to ldisc_send(NULL, |
| 731 | * 0) in ssh.c. Nothing in PSFTP actually needs to use the |
| 732 | * ldisc as an ldisc. So if we get called with any real data, I |
| 733 | * want to know about it. |
| 734 | */ |
| 735 | assert(len == 0); |
| 736 | } |
| 737 | |
| 738 | /* |
| 739 | * Be told what socket we're supposed to be using. |
| 740 | */ |
| 741 | static SOCKET sftp_ssh_socket; |
| 742 | char *do_select(SOCKET skt, int startup) { |
| 743 | if (startup) |
| 744 | sftp_ssh_socket = skt; |
| 745 | else |
| 746 | sftp_ssh_socket = INVALID_SOCKET; |
| 747 | return NULL; |
| 748 | } |
| 749 | extern int select_result(WPARAM, LPARAM); |
| 750 | |
| 751 | /* |
| 752 | * Receive a block of data from the SSH link. Block until all data |
| 753 | * is available. |
| 754 | * |
| 755 | * To do this, we repeatedly call the SSH protocol module, with our |
| 756 | * own trap in from_backend() to catch the data that comes back. We |
| 757 | * do this until we have enough data. |
| 758 | */ |
| 759 | |
| 760 | static unsigned char *outptr; /* where to put the data */ |
| 761 | static unsigned outlen; /* how much data required */ |
| 762 | static unsigned char *pending = NULL; /* any spare data */ |
| 763 | static unsigned pendlen=0, pendsize=0; /* length and phys. size of buffer */ |
| 764 | void from_backend(int is_stderr, char *data, int datalen) { |
| 765 | unsigned char *p = (unsigned char *)data; |
| 766 | unsigned len = (unsigned)datalen; |
| 767 | |
| 768 | /* |
| 769 | * stderr data is just spouted to local stderr and otherwise |
| 770 | * ignored. |
| 771 | */ |
| 772 | if (is_stderr) { |
| 773 | fwrite(data, 1, len, stderr); |
| 774 | return; |
| 775 | } |
| 776 | |
| 777 | /* |
| 778 | * If this is before the real session begins, just return. |
| 779 | */ |
| 780 | if (!outptr) |
| 781 | return; |
| 782 | |
| 783 | if (outlen > 0) { |
| 784 | unsigned used = outlen; |
| 785 | if (used > len) used = len; |
| 786 | memcpy(outptr, p, used); |
| 787 | outptr += used; outlen -= used; |
| 788 | p += used; len -= used; |
| 789 | } |
| 790 | |
| 791 | if (len > 0) { |
| 792 | if (pendsize < pendlen + len) { |
| 793 | pendsize = pendlen + len + 4096; |
| 794 | pending = (pending ? srealloc(pending, pendsize) : |
| 795 | smalloc(pendsize)); |
| 796 | if (!pending) |
| 797 | fatalbox("Out of memory"); |
| 798 | } |
| 799 | memcpy(pending+pendlen, p, len); |
| 800 | pendlen += len; |
| 801 | } |
| 802 | } |
| 803 | int sftp_recvdata(char *buf, int len) { |
| 804 | outptr = (unsigned char *)buf; |
| 805 | outlen = len; |
| 806 | |
| 807 | /* |
| 808 | * See if the pending-input block contains some of what we |
| 809 | * need. |
| 810 | */ |
| 811 | if (pendlen > 0) { |
| 812 | unsigned pendused = pendlen; |
| 813 | if (pendused > outlen) |
| 814 | pendused = outlen; |
| 815 | memcpy(outptr, pending, pendused); |
| 816 | memmove(pending, pending+pendused, pendlen-pendused); |
| 817 | outptr += pendused; |
| 818 | outlen -= pendused; |
| 819 | pendlen -= pendused; |
| 820 | if (pendlen == 0) { |
| 821 | pendsize = 0; |
| 822 | sfree(pending); |
| 823 | pending = NULL; |
| 824 | } |
| 825 | if (outlen == 0) |
| 826 | return 1; |
| 827 | } |
| 828 | |
| 829 | while (outlen > 0) { |
| 830 | fd_set readfds; |
| 831 | |
| 832 | FD_ZERO(&readfds); |
| 833 | FD_SET(sftp_ssh_socket, &readfds); |
| 834 | if (select(1, &readfds, NULL, NULL, NULL) < 0) |
| 835 | return 0; /* doom */ |
| 836 | select_result((WPARAM)sftp_ssh_socket, (LPARAM)FD_READ); |
| 837 | } |
| 838 | |
| 839 | return 1; |
| 840 | } |
| 841 | int sftp_senddata(char *buf, int len) { |
| 842 | back->send((unsigned char *)buf, len); |
| 843 | return 1; |
| 844 | } |
| 845 | |
| 846 | /* |
| 847 | * Loop through the ssh connection and authentication process. |
| 848 | */ |
| 849 | static void ssh_sftp_init(void) { |
| 850 | if (sftp_ssh_socket == INVALID_SOCKET) |
| 851 | return; |
| 852 | while (!back->sendok()) { |
| 853 | fd_set readfds; |
| 854 | FD_ZERO(&readfds); |
| 855 | FD_SET(sftp_ssh_socket, &readfds); |
| 856 | if (select(1, &readfds, NULL, NULL, NULL) < 0) |
| 857 | return; /* doom */ |
| 858 | select_result((WPARAM)sftp_ssh_socket, (LPARAM)FD_READ); |
| 859 | } |
| 860 | } |
| 861 | |
| 862 | static char *password = NULL; |
| 863 | static int get_line(const char *prompt, char *str, int maxlen, int is_pw) |
| 864 | { |
| 865 | HANDLE hin, hout; |
| 866 | DWORD savemode, newmode, i; |
| 867 | |
| 868 | if (password) { |
| 869 | static int tried_once = 0; |
| 870 | |
| 871 | if (tried_once) { |
| 872 | return 0; |
| 873 | } else { |
| 874 | strncpy(str, password, maxlen); |
| 875 | str[maxlen-1] = '\0'; |
| 876 | tried_once = 1; |
| 877 | return 1; |
| 878 | } |
| 879 | } |
| 880 | |
| 881 | hin = GetStdHandle(STD_INPUT_HANDLE); |
| 882 | hout = GetStdHandle(STD_OUTPUT_HANDLE); |
| 883 | if (hin == INVALID_HANDLE_VALUE || hout == INVALID_HANDLE_VALUE) { |
| 884 | fprintf(stderr, "Cannot get standard input/output handles\n"); |
| 885 | exit(1); |
| 886 | } |
| 887 | |
| 888 | GetConsoleMode(hin, &savemode); |
| 889 | newmode = savemode | ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT; |
| 890 | if (is_pw) |
| 891 | newmode &= ~ENABLE_ECHO_INPUT; |
| 892 | else |
| 893 | newmode |= ENABLE_ECHO_INPUT; |
| 894 | SetConsoleMode(hin, newmode); |
| 895 | |
| 896 | WriteFile(hout, prompt, strlen(prompt), &i, NULL); |
| 897 | ReadFile(hin, str, maxlen-1, &i, NULL); |
| 898 | |
| 899 | SetConsoleMode(hin, savemode); |
| 900 | |
| 901 | if ((int)i > maxlen) i = maxlen-1; else i = i - 2; |
| 902 | str[i] = '\0'; |
| 903 | |
| 904 | if (is_pw) |
| 905 | WriteFile(hout, "\r\n", 2, &i, NULL); |
| 906 | |
| 907 | return 1; |
| 908 | } |
| 909 | |
| 910 | /* |
| 911 | * Initialize the Win$ock driver. |
| 912 | */ |
| 913 | static void init_winsock(void) |
| 914 | { |
| 915 | WORD winsock_ver; |
| 916 | WSADATA wsadata; |
| 917 | |
| 918 | winsock_ver = MAKEWORD(1, 1); |
| 919 | if (WSAStartup(winsock_ver, &wsadata)) { |
| 920 | fprintf(stderr, "Unable to initialise WinSock"); |
| 921 | exit(1); |
| 922 | } |
| 923 | if (LOBYTE(wsadata.wVersion) != 1 || |
| 924 | HIBYTE(wsadata.wVersion) != 1) { |
| 925 | fprintf(stderr, "WinSock version is incompatible with 1.1"); |
| 926 | exit(1); |
| 927 | } |
| 928 | } |
| 929 | |
| 930 | /* |
| 931 | * Short description of parameters. |
| 932 | */ |
| 933 | static void usage(void) |
| 934 | { |
| 935 | printf("PuTTY Secure File Transfer (SFTP) client\n"); |
| 936 | printf("%s\n", ver); |
| 937 | printf("Usage: psftp [options] user@host\n"); |
| 938 | printf("Options:\n"); |
| 939 | printf(" -v show verbose messages\n"); |
| 940 | printf(" -P port connect to specified port\n"); |
| 941 | printf(" -pw passw login with specified password\n"); |
| 942 | exit(1); |
| 943 | } |
| 944 | |
| 945 | /* |
| 946 | * Main program. Parse arguments etc. |
| 947 | */ |
| 948 | int main(int argc, char *argv[]) |
| 949 | { |
| 950 | int i; |
| 951 | int portnumber = 0; |
| 952 | char *user, *host, *userhost, *realhost; |
| 953 | char *err; |
| 954 | |
| 955 | flags = FLAG_STDERR; |
| 956 | ssh_get_line = &get_line; |
| 957 | init_winsock(); |
| 958 | sk_init(); |
| 959 | |
| 960 | userhost = user = NULL; |
| 961 | |
| 962 | for (i = 1; i < argc; i++) { |
| 963 | if (argv[i][0] != '-') { |
| 964 | if (userhost) |
| 965 | usage(); |
| 966 | else |
| 967 | userhost = dupstr(argv[i]); |
| 968 | } else if (strcmp(argv[i], "-v") == 0) { |
| 969 | verbose = 1, flags |= FLAG_VERBOSE; |
| 970 | } else if (strcmp(argv[i], "-h") == 0 || |
| 971 | strcmp(argv[i], "-?") == 0) { |
| 972 | usage(); |
| 973 | } else if (strcmp(argv[i], "-l") == 0 && i+1 < argc) { |
| 974 | user = argv[++i]; |
| 975 | } else if (strcmp(argv[i], "-P") == 0 && i+1 < argc) { |
| 976 | portnumber = atoi(argv[++i]); |
| 977 | } else if (strcmp(argv[i], "-pw") == 0 && i+1 < argc) { |
| 978 | password = argv[++i]; |
| 979 | } else if (strcmp(argv[i], "--") == 0) { |
| 980 | i++; |
| 981 | break; |
| 982 | } else { |
| 983 | usage(); |
| 984 | } |
| 985 | } |
| 986 | argc -= i; |
| 987 | argv += i; |
| 988 | back = NULL; |
| 989 | |
| 990 | if (argc > 0 || !userhost) |
| 991 | usage(); |
| 992 | |
| 993 | /* Separate host and username */ |
| 994 | host = userhost; |
| 995 | host = strrchr(host, '@'); |
| 996 | if (host == NULL) { |
| 997 | host = userhost; |
| 998 | } else { |
| 999 | *host++ = '\0'; |
| 1000 | if (user) { |
| 1001 | printf("psftp: multiple usernames specified; using \"%s\"\n", user); |
| 1002 | } else |
| 1003 | user = userhost; |
| 1004 | } |
| 1005 | |
| 1006 | /* Try to load settings for this host */ |
| 1007 | do_defaults(host, &cfg); |
| 1008 | if (cfg.host[0] == '\0') { |
| 1009 | /* No settings for this host; use defaults */ |
| 1010 | do_defaults(NULL, &cfg); |
| 1011 | strncpy(cfg.host, host, sizeof(cfg.host)-1); |
| 1012 | cfg.host[sizeof(cfg.host)-1] = '\0'; |
| 1013 | cfg.port = 22; |
| 1014 | } |
| 1015 | |
| 1016 | /* Set username */ |
| 1017 | if (user != NULL && user[0] != '\0') { |
| 1018 | strncpy(cfg.username, user, sizeof(cfg.username)-1); |
| 1019 | cfg.username[sizeof(cfg.username)-1] = '\0'; |
| 1020 | } |
| 1021 | if (!cfg.username[0]) { |
| 1022 | printf("login as: "); |
| 1023 | if (!fgets(cfg.username, sizeof(cfg.username), stdin)) { |
| 1024 | fprintf(stderr, "psftp: aborting\n"); |
| 1025 | exit(1); |
| 1026 | } else { |
| 1027 | int len = strlen(cfg.username); |
| 1028 | if (cfg.username[len-1] == '\n') |
| 1029 | cfg.username[len-1] = '\0'; |
| 1030 | } |
| 1031 | } |
| 1032 | |
| 1033 | if (cfg.protocol != PROT_SSH) |
| 1034 | cfg.port = 22; |
| 1035 | |
| 1036 | if (portnumber) |
| 1037 | cfg.port = portnumber; |
| 1038 | |
| 1039 | /* SFTP uses SSH2 by default always */ |
| 1040 | cfg.sshprot = 2; |
| 1041 | |
| 1042 | /* Set up subsystem name. FIXME: fudge for SSH1. */ |
| 1043 | strcpy(cfg.remote_cmd, "sftp"); |
| 1044 | cfg.ssh_subsys = TRUE; |
| 1045 | cfg.nopty = TRUE; |
| 1046 | |
| 1047 | back = &ssh_backend; |
| 1048 | |
| 1049 | err = back->init(cfg.host, cfg.port, &realhost); |
| 1050 | if (err != NULL) { |
| 1051 | fprintf(stderr, "ssh_init: %s", err); |
| 1052 | return 1; |
| 1053 | } |
| 1054 | ssh_sftp_init(); |
| 1055 | if (verbose && realhost != NULL) |
| 1056 | printf("Connected to %s\n", realhost); |
| 1057 | |
| 1058 | do_sftp(); |
| 1059 | |
| 1060 | if (back != NULL && back->socket() != NULL) { |
| 1061 | char ch; |
| 1062 | back->special(TS_EOF); |
| 1063 | sftp_recvdata(&ch, 1); |
| 1064 | } |
| 1065 | WSACleanup(); |
| 1066 | random_save_seed(); |
| 1067 | |
| 1068 | return 0; |
| 1069 | } |