| 4c7f0d61 |
1 | /* |
| 2 | * psftp.c: front end for PSFTP. |
| 3 | */ |
| 4 | |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | #include <assert.h> |
| 8 | #include <unistd.h> |
| 9 | |
| 10 | #include "sftp.h" |
| 11 | #include "int64.h" |
| 12 | |
| 13 | #define smalloc malloc |
| 14 | #define srealloc realloc |
| 15 | #define sfree free |
| 16 | |
| 17 | /* ---------------------------------------------------------------------- |
| 18 | * String handling routines. |
| 19 | */ |
| 20 | |
| 21 | char *dupstr(char *s) { |
| 22 | int len = strlen(s); |
| 23 | char *p = smalloc(len+1); |
| 24 | strcpy(p, s); |
| 25 | return p; |
| 26 | } |
| 27 | |
| 28 | /* ---------------------------------------------------------------------- |
| 29 | * sftp client state. |
| 30 | */ |
| 31 | |
| 32 | char *pwd, *homedir; |
| 33 | |
| 34 | /* ---------------------------------------------------------------------- |
| 35 | * Higher-level helper functions used in commands. |
| 36 | */ |
| 37 | |
| 38 | /* |
| 39 | * Canonify a pathname starting from the pwd. |
| 40 | */ |
| 41 | char *canonify(char *name) { |
| 42 | if (name[0] == '/') |
| 43 | return fxp_realpath(name, NULL); |
| 44 | else |
| 45 | return fxp_realpath(pwd, name); |
| 46 | } |
| 47 | |
| 48 | /* ---------------------------------------------------------------------- |
| 49 | * Actual sftp commands. |
| 50 | */ |
| 51 | struct sftp_command { |
| 52 | char **words; |
| 53 | int nwords, wordssize; |
| 54 | int (*obey)(struct sftp_command *);/* returns <0 to quit */ |
| 55 | }; |
| 56 | |
| 57 | int sftp_cmd_null(struct sftp_command *cmd) { |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | int sftp_cmd_unknown(struct sftp_command *cmd) { |
| 62 | printf("psftp: unknown command \"%s\"\n", cmd->words[0]); |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | int sftp_cmd_quit(struct sftp_command *cmd) { |
| 67 | return -1; |
| 68 | } |
| 69 | |
| 70 | /* |
| 71 | * List a directory. If no arguments are given, list pwd; otherwise |
| 72 | * list the directory given in words[1]. |
| 73 | */ |
| 74 | static int sftp_ls_compare(const void *av, const void *bv) { |
| 75 | const struct fxp_name *a = (const struct fxp_name *)av; |
| 76 | const struct fxp_name *b = (const struct fxp_name *)bv; |
| 77 | return strcmp(a->filename, b->filename); |
| 78 | } |
| 79 | int sftp_cmd_ls(struct sftp_command *cmd) { |
| 80 | struct fxp_handle *dirh; |
| 81 | struct fxp_names *names; |
| 82 | struct fxp_name *ournames; |
| 83 | int nnames, namesize; |
| 84 | char *dir, *cdir; |
| 85 | int i; |
| 86 | |
| 87 | if (cmd->nwords < 2) |
| 88 | dir = "."; |
| 89 | else |
| 90 | dir = cmd->words[1]; |
| 91 | |
| 92 | cdir = canonify(dir); |
| 93 | if (!cdir) { |
| 94 | printf("%s: %s\n", dir, fxp_error()); |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | printf("Listing directory %s\n", cdir); |
| 99 | |
| 100 | dirh = fxp_opendir(cdir); |
| 101 | if (dirh == NULL) { |
| 102 | printf("Unable to open %s: %s\n", dir, fxp_error()); |
| 103 | } else { |
| 104 | nnames = namesize = 0; |
| 105 | ournames = NULL; |
| 106 | |
| 107 | while (1) { |
| 108 | |
| 109 | names = fxp_readdir(dirh); |
| 110 | if (names == NULL) { |
| 111 | if (fxp_error_type() == SSH_FX_EOF) |
| 112 | break; |
| 113 | printf("Reading directory %s: %s\n", dir, fxp_error()); |
| 114 | break; |
| 115 | } |
| 116 | if (names->nnames == 0) { |
| 117 | fxp_free_names(names); |
| 118 | break; |
| 119 | } |
| 120 | |
| 121 | if (nnames + names->nnames >= namesize) { |
| 122 | namesize += names->nnames + 128; |
| 123 | ournames = srealloc(ournames, namesize * sizeof(*ournames)); |
| 124 | } |
| 125 | |
| 126 | for (i = 0; i < names->nnames; i++) |
| 127 | ournames[nnames++] = names->names[i]; |
| 128 | |
| 129 | names->nnames = 0; /* prevent free_names */ |
| 130 | fxp_free_names(names); |
| 131 | } |
| 132 | fxp_close(dirh); |
| 133 | |
| 134 | /* |
| 135 | * Now we have our filenames. Sort them by actual file |
| 136 | * name, and then output the longname parts. |
| 137 | */ |
| 138 | qsort(ournames, nnames, sizeof(*ournames), sftp_ls_compare); |
| 139 | |
| 140 | /* |
| 141 | * And print them. |
| 142 | */ |
| 143 | for (i = 0; i < nnames; i++) |
| 144 | printf("%s\n", ournames[i].longname); |
| 145 | } |
| 146 | |
| 147 | sfree(cdir); |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | /* |
| 153 | * Change directories. We do this by canonifying the new name, then |
| 154 | * trying to OPENDIR it. Only if that succeeds do we set the new pwd. |
| 155 | */ |
| 156 | int sftp_cmd_cd(struct sftp_command *cmd) { |
| 157 | struct fxp_handle *dirh; |
| 158 | char *dir; |
| 159 | |
| 160 | if (cmd->nwords < 2) |
| 161 | dir = fxp_realpath(".", NULL); |
| 162 | else |
| 163 | dir = canonify(cmd->words[1]); |
| 164 | |
| 165 | if (!dir) { |
| 166 | printf("%s: %s\n", dir, fxp_error()); |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | dirh = fxp_opendir(dir); |
| 171 | if (!dirh) { |
| 172 | printf("Directory %s: %s\n", dir, fxp_error()); |
| 173 | sfree(dir); |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | fxp_close(dirh); |
| 178 | |
| 179 | sfree(pwd); |
| 180 | pwd = dir; |
| 181 | printf("Remote directory is now %s\n", pwd); |
| 182 | |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Get a file and save it at the local end. |
| 188 | */ |
| 189 | int sftp_cmd_get(struct sftp_command *cmd) { |
| 190 | struct fxp_handle *fh; |
| 191 | char *fname, *outfname; |
| 192 | uint64 offset; |
| 193 | FILE *fp; |
| 194 | |
| 195 | if (cmd->nwords < 2) { |
| 196 | printf("get: expects a filename\n"); |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | fname = canonify(cmd->words[1]); |
| 201 | if (!fname) { |
| 202 | printf("%s: %s\n", cmd->words[1], fxp_error()); |
| 203 | return 0; |
| 204 | } |
| 205 | outfname = (cmd->nwords == 2 ? cmd->words[1] : cmd->words[2]); |
| 206 | |
| 207 | fh = fxp_open(fname, SSH_FXF_READ); |
| 208 | if (!fh) { |
| 209 | printf("%s: %s\n", fname, fxp_error()); |
| 210 | sfree(fname); |
| 211 | return 0; |
| 212 | } |
| 213 | fp = fopen(outfname, "wb"); |
| 214 | if (!fp) { |
| 215 | printf("local: unable to open %s\n", outfname); |
| 216 | fxp_close(fh); |
| 217 | sfree(fname); |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | printf("remote:%s => local:%s\n", fname, outfname); |
| 222 | |
| 223 | offset = uint64_make(0,0); |
| 224 | |
| 225 | /* |
| 226 | * FIXME: we can use FXP_FSTAT here to get the file size, and |
| 227 | * thus put up a progress bar. |
| 228 | */ |
| 229 | while (1) { |
| 230 | char buffer[4096]; |
| 231 | int len; |
| 232 | int wpos, wlen; |
| 233 | |
| 234 | len = fxp_read(fh, buffer, offset, sizeof(buffer)); |
| 235 | if ((len == -1 && fxp_error_type() == SSH_FX_EOF) || |
| 236 | len == 0) |
| 237 | break; |
| 238 | if (len == -1) { |
| 239 | printf("error while reading: %s\n", fxp_error()); |
| 240 | break; |
| 241 | } |
| 242 | |
| 243 | wpos = 0; |
| 244 | while (wpos < len) { |
| 245 | wlen = fwrite(buffer, 1, len-wpos, fp); |
| 246 | if (wlen <= 0) { |
| 247 | printf("error while writing local file\n"); |
| 248 | break; |
| 249 | } |
| 250 | wpos += wlen; |
| 251 | } |
| 252 | if (wpos < len) /* we had an error */ |
| 253 | break; |
| 254 | offset = uint64_add32(offset, len); |
| 255 | } |
| 256 | |
| 257 | fclose(fp); |
| 258 | fxp_close(fh); |
| 259 | sfree(fname); |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | |
| 264 | /* |
| 265 | * Send a file and store it at the remote end. |
| 266 | */ |
| 267 | int sftp_cmd_put(struct sftp_command *cmd) { |
| 268 | struct fxp_handle *fh; |
| 269 | char *fname, *origoutfname, *outfname; |
| 270 | uint64 offset; |
| 271 | FILE *fp; |
| 272 | |
| 273 | if (cmd->nwords < 2) { |
| 274 | printf("put: expects a filename\n"); |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | fname = cmd->words[1]; |
| 279 | origoutfname = (cmd->nwords == 2 ? cmd->words[1] : cmd->words[2]); |
| 280 | outfname = canonify(origoutfname); |
| 281 | ~|~ if (!outfname) { |
| 282 | printf("%s: %s\n", origoutfname, fxp_error()); |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | fp = fopen(fname, "rb"); |
| 287 | if (!fp) { |
| 288 | printf("local: unable to open %s\n", fname); |
| 289 | fxp_close(fh); |
| 290 | sfree(outfname); |
| 291 | return 0; |
| 292 | } |
| 293 | fh = fxp_open(outfname, SSH_FXF_WRITE | SSH_FXF_CREAT | SSH_FXF_TRUNC); |
| 294 | if (!fh) { |
| 295 | printf("%s: %s\n", outfname, fxp_error()); |
| 296 | sfree(outfname); |
| 297 | return 0; |
| 298 | } |
| 299 | |
| 300 | printf("local:%s => remote:%s\n", fname, outfname); |
| 301 | |
| 302 | offset = uint64_make(0,0); |
| 303 | |
| 304 | /* |
| 305 | * FIXME: we can use FXP_FSTAT here to get the file size, and |
| 306 | * thus put up a progress bar. |
| 307 | */ |
| 308 | while (1) { |
| 309 | char buffer[4096]; |
| 310 | int len; |
| 311 | |
| 312 | len = fread(buffer, 1, len, fp); |
| 313 | if (len == -1) { |
| 314 | printf("error while reading local file\n"); |
| 315 | break; |
| 316 | } else if (len == 0) { |
| 317 | break; |
| 318 | } |
| 319 | if (!fxp_write(fh, buffer, offset, sizeof(buffer))) { |
| 320 | printf("error while writing: %s\n", fxp_error()); |
| 321 | break; |
| 322 | } |
| 323 | offset = uint64_add32(offset, len); |
| 324 | } |
| 325 | |
| 326 | fxp_close(fh); |
| 327 | fclose(fp); |
| 328 | sfree(outfname); |
| 329 | |
| 330 | return 0; |
| 331 | } |
| 332 | |
| 333 | static struct sftp_cmd_lookup { |
| 334 | char *name; |
| 335 | int (*obey)(struct sftp_command *); |
| 336 | } sftp_lookup[] = { |
| 337 | /* |
| 338 | * List of sftp commands. This is binary-searched so it MUST be |
| 339 | * in ASCII order. |
| 340 | */ |
| 341 | {"bye", sftp_cmd_quit}, |
| 342 | {"cd", sftp_cmd_cd}, |
| 343 | {"exit", sftp_cmd_quit}, |
| 344 | {"get", sftp_cmd_get}, |
| 345 | {"ls", sftp_cmd_ls}, |
| 346 | {"put", sftp_cmd_put}, |
| 347 | {"quit", sftp_cmd_quit}, |
| 348 | }; |
| 349 | |
| 350 | /* ---------------------------------------------------------------------- |
| 351 | * Command line reading and parsing. |
| 352 | */ |
| 353 | struct sftp_command *sftp_getcmd(void) { |
| 354 | char *line; |
| 355 | int linelen, linesize; |
| 356 | struct sftp_command *cmd; |
| 357 | char *p, *q, *r; |
| 358 | int quoting; |
| 359 | |
| 360 | printf("psftp> "); |
| 361 | fflush(stdout); |
| 362 | |
| 363 | cmd = smalloc(sizeof(struct sftp_command)); |
| 364 | cmd->words = NULL; |
| 365 | cmd->nwords = 0; |
| 366 | cmd->wordssize = 0; |
| 367 | |
| 368 | line = NULL; |
| 369 | linesize = linelen = 0; |
| 370 | while (1) { |
| 371 | int len; |
| 372 | char *ret; |
| 373 | |
| 374 | linesize += 512; |
| 375 | line = srealloc(line, linesize); |
| 376 | ret = fgets(line+linelen, linesize-linelen, stdin); |
| 377 | |
| 378 | if (!ret || (linelen == 0 && line[0] == '\0')) { |
| 379 | cmd->obey = sftp_cmd_quit; |
| 380 | printf("quit\n"); |
| 381 | return cmd; /* eof */ |
| 382 | } |
| 383 | len = linelen + strlen(line+linelen); |
| 384 | linelen += len; |
| 385 | if (line[linelen-1] == '\n') { |
| 386 | linelen--; |
| 387 | line[linelen] = '\0'; |
| 388 | break; |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | /* |
| 393 | * Parse the command line into words. The syntax is: |
| 394 | * - double quotes are removed, but cause spaces within to be |
| 395 | * treated as non-separating. |
| 396 | * - a double-doublequote pair is a literal double quote, inside |
| 397 | * _or_ outside quotes. Like this: |
| 398 | * |
| 399 | * firstword "second word" "this has ""quotes"" in" sodoes""this"" |
| 400 | * |
| 401 | * becomes |
| 402 | * |
| 403 | * >firstword< |
| 404 | * >second word< |
| 405 | * >this has "quotes" in< |
| 406 | * >sodoes"this"< |
| 407 | */ |
| 408 | p = line; |
| 409 | while (*p) { |
| 410 | /* skip whitespace */ |
| 411 | while (*p && (*p == ' ' || *p == '\t')) p++; |
| 412 | /* mark start of word */ |
| 413 | q = r = p; /* q sits at start, r writes word */ |
| 414 | quoting = 0; |
| 415 | while (*p) { |
| 416 | if (!quoting && (*p == ' ' || *p == '\t')) |
| 417 | break; /* reached end of word */ |
| 418 | else if (*p == '"' && p[1] == '"') |
| 419 | p+=2, *r++ = '"'; /* a literal quote */ |
| 420 | else if (*p == '"') |
| 421 | p++, quoting = !quoting; |
| 422 | else |
| 423 | *r++ = *p++; |
| 424 | } |
| 425 | if (*p) p++; /* skip over the whitespace */ |
| 426 | *r = '\0'; |
| 427 | if (cmd->nwords >= cmd->wordssize) { |
| 428 | cmd->wordssize = cmd->nwords + 16; |
| 429 | cmd->words = srealloc(cmd->words, cmd->wordssize*sizeof(char *)); |
| 430 | } |
| 431 | cmd->words[cmd->nwords++] = q; |
| 432 | } |
| 433 | |
| 434 | /* |
| 435 | * Now parse the first word and assign a function. |
| 436 | */ |
| 437 | |
| 438 | if (cmd->nwords == 0) |
| 439 | cmd->obey = sftp_cmd_null; |
| 440 | else { |
| 441 | int i, j, k, cmp; |
| 442 | |
| 443 | cmd->obey = sftp_cmd_unknown; |
| 444 | |
| 445 | i = -1; |
| 446 | j = sizeof(sftp_lookup) / sizeof(*sftp_lookup); |
| 447 | while (j - i > 1) { |
| 448 | k = (j + i) / 2; |
| 449 | cmp = strcmp(cmd->words[0], sftp_lookup[k].name); |
| 450 | if (cmp < 0) |
| 451 | j = k; |
| 452 | else if (cmp > 0) |
| 453 | i = k; |
| 454 | else { |
| 455 | cmd->obey = sftp_lookup[k].obey; |
| 456 | break; |
| 457 | } |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | return cmd; |
| 462 | } |
| 463 | |
| 464 | void do_sftp(void) { |
| 465 | /* |
| 466 | * Do protocol initialisation. |
| 467 | */ |
| 468 | if (!fxp_init()) { |
| 469 | fprintf(stderr, |
| 470 | "Fatal: unable to initialise SFTP: %s\n", |
| 471 | fxp_error()); |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * Find out where our home directory is. |
| 476 | */ |
| 477 | homedir = fxp_realpath(".", NULL); |
| 478 | if (!homedir) { |
| 479 | fprintf(stderr, |
| 480 | "Warning: failed to resolve home directory: %s\n", |
| 481 | fxp_error()); |
| 482 | homedir = dupstr("."); |
| 483 | } else { |
| 484 | printf("Remote working directory is %s\n", homedir); |
| 485 | } |
| 486 | pwd = dupstr(homedir); |
| 487 | |
| 488 | /* ------------------------------------------------------------------ |
| 489 | * Now we're ready to do Real Stuff. |
| 490 | */ |
| 491 | while (1) { |
| 492 | struct sftp_command *cmd; |
| 493 | cmd = sftp_getcmd(); |
| 494 | if (!cmd) |
| 495 | break; |
| 496 | if (cmd->obey(cmd) < 0) |
| 497 | break; |
| 498 | } |
| 499 | |
| 500 | /* ------------------------------------------------------------------ |
| 501 | * We've received an exit command. Tidy up and leave. |
| 502 | */ |
| 503 | io_finish(); |
| 504 | } |
| 505 | |
| 506 | int main(void) { |
| 507 | io_init(); |
| 508 | do_sftp(); |
| 509 | return 0; |
| 510 | } |
projects / u / mdw / putty / blame