4c7f0d61 |
1 | /* |
2 | * psftp.c: front end for PSFTP. |
3 | */ |
4 | |
4a8fc3c4 |
5 | #include <windows.h> |
6 | |
4c7f0d61 |
7 | #include <stdio.h> |
8 | #include <stdlib.h> |
f9e162aa |
9 | #include <stdarg.h> |
4c7f0d61 |
10 | #include <assert.h> |
4c7f0d61 |
11 | |
4a8fc3c4 |
12 | #define PUTTY_DO_GLOBALS |
13 | #include "putty.h" |
14 | #include "storage.h" |
15 | #include "ssh.h" |
4c7f0d61 |
16 | #include "sftp.h" |
17 | #include "int64.h" |
18 | |
4c7f0d61 |
19 | /* ---------------------------------------------------------------------- |
20 | * String handling routines. |
21 | */ |
22 | |
32874aea |
23 | char *dupstr(char *s) |
24 | { |
4c7f0d61 |
25 | int len = strlen(s); |
32874aea |
26 | char *p = smalloc(len + 1); |
4c7f0d61 |
27 | strcpy(p, s); |
28 | return p; |
29 | } |
30 | |
f9e162aa |
31 | /* Allocate the concatenation of N strings. Terminate arg list with NULL. */ |
32874aea |
32 | char *dupcat(char *s1, ...) |
33 | { |
f9e162aa |
34 | int len; |
35 | char *p, *q, *sn; |
36 | va_list ap; |
37 | |
38 | len = strlen(s1); |
39 | va_start(ap, s1); |
40 | while (1) { |
41 | sn = va_arg(ap, char *); |
42 | if (!sn) |
43 | break; |
44 | len += strlen(sn); |
45 | } |
46 | va_end(ap); |
47 | |
32874aea |
48 | p = smalloc(len + 1); |
f9e162aa |
49 | strcpy(p, s1); |
50 | q = p + strlen(p); |
51 | |
52 | va_start(ap, s1); |
53 | while (1) { |
54 | sn = va_arg(ap, char *); |
55 | if (!sn) |
56 | break; |
57 | strcpy(q, sn); |
58 | q += strlen(q); |
59 | } |
60 | va_end(ap); |
61 | |
62 | return p; |
63 | } |
64 | |
4c7f0d61 |
65 | /* ---------------------------------------------------------------------- |
66 | * sftp client state. |
67 | */ |
68 | |
69 | char *pwd, *homedir; |
70 | |
71 | /* ---------------------------------------------------------------------- |
72 | * Higher-level helper functions used in commands. |
73 | */ |
74 | |
75 | /* |
f9e162aa |
76 | * Attempt to canonify a pathname starting from the pwd. If |
77 | * canonification fails, at least fall back to returning a _valid_ |
78 | * pathname (though it may be ugly, eg /home/simon/../foobar). |
4c7f0d61 |
79 | */ |
32874aea |
80 | char *canonify(char *name) |
81 | { |
f9e162aa |
82 | char *fullname, *canonname; |
4a8fc3c4 |
83 | |
f9e162aa |
84 | if (name[0] == '/') { |
85 | fullname = dupstr(name); |
86 | } else { |
4a8fc3c4 |
87 | char *slash; |
32874aea |
88 | if (pwd[strlen(pwd) - 1] == '/') |
4a8fc3c4 |
89 | slash = ""; |
90 | else |
91 | slash = "/"; |
92 | fullname = dupcat(pwd, slash, name, NULL); |
f9e162aa |
93 | } |
4a8fc3c4 |
94 | |
95 | canonname = fxp_realpath(fullname); |
96 | |
f9e162aa |
97 | if (canonname) { |
98 | sfree(fullname); |
99 | return canonname; |
50d7e054 |
100 | } else { |
32874aea |
101 | /* |
102 | * Attempt number 2. Some FXP_REALPATH implementations |
103 | * (glibc-based ones, in particular) require the _whole_ |
104 | * path to point to something that exists, whereas others |
105 | * (BSD-based) only require all but the last component to |
106 | * exist. So if the first call failed, we should strip off |
107 | * everything from the last slash onwards and try again, |
108 | * then put the final component back on. |
109 | * |
110 | * Special cases: |
111 | * |
112 | * - if the last component is "/." or "/..", then we don't |
113 | * bother trying this because there's no way it can work. |
114 | * |
115 | * - if the thing actually ends with a "/", we remove it |
116 | * before we start. Except if the string is "/" itself |
117 | * (although I can't see why we'd have got here if so, |
118 | * because surely "/" would have worked the first |
119 | * time?), in which case we don't bother. |
120 | * |
121 | * - if there's no slash in the string at all, give up in |
122 | * confusion (we expect at least one because of the way |
123 | * we constructed the string). |
124 | */ |
125 | |
126 | int i; |
127 | char *returnname; |
128 | |
129 | i = strlen(fullname); |
130 | if (i > 2 && fullname[i - 1] == '/') |
131 | fullname[--i] = '\0'; /* strip trailing / unless at pos 0 */ |
132 | while (i > 0 && fullname[--i] != '/'); |
133 | |
134 | /* |
135 | * Give up on special cases. |
136 | */ |
137 | if (fullname[i] != '/' || /* no slash at all */ |
138 | !strcmp(fullname + i, "/.") || /* ends in /. */ |
139 | !strcmp(fullname + i, "/..") || /* ends in /.. */ |
140 | !strcmp(fullname, "/")) { |
141 | return fullname; |
142 | } |
143 | |
144 | /* |
145 | * Now i points at the slash. Deal with the final special |
146 | * case i==0 (ie the whole path was "/nonexistentfile"). |
147 | */ |
148 | fullname[i] = '\0'; /* separate the string */ |
149 | if (i == 0) { |
150 | canonname = fxp_realpath("/"); |
151 | } else { |
152 | canonname = fxp_realpath(fullname); |
153 | } |
154 | |
155 | if (!canonname) |
156 | return fullname; /* even that failed; give up */ |
157 | |
158 | /* |
159 | * We have a canonical name for all but the last path |
160 | * component. Concatenate the last component and return. |
161 | */ |
162 | returnname = dupcat(canonname, |
163 | canonname[strlen(canonname) - 1] == |
164 | '/' ? "" : "/", fullname + i + 1, NULL); |
165 | sfree(fullname); |
166 | sfree(canonname); |
167 | return returnname; |
50d7e054 |
168 | } |
4c7f0d61 |
169 | } |
170 | |
171 | /* ---------------------------------------------------------------------- |
172 | * Actual sftp commands. |
173 | */ |
174 | struct sftp_command { |
175 | char **words; |
176 | int nwords, wordssize; |
32874aea |
177 | int (*obey) (struct sftp_command *); /* returns <0 to quit */ |
4c7f0d61 |
178 | }; |
179 | |
32874aea |
180 | int sftp_cmd_null(struct sftp_command *cmd) |
181 | { |
4c7f0d61 |
182 | return 0; |
183 | } |
184 | |
32874aea |
185 | int sftp_cmd_unknown(struct sftp_command *cmd) |
186 | { |
4c7f0d61 |
187 | printf("psftp: unknown command \"%s\"\n", cmd->words[0]); |
188 | return 0; |
189 | } |
190 | |
32874aea |
191 | int sftp_cmd_quit(struct sftp_command *cmd) |
192 | { |
4c7f0d61 |
193 | return -1; |
194 | } |
195 | |
196 | /* |
197 | * List a directory. If no arguments are given, list pwd; otherwise |
198 | * list the directory given in words[1]. |
199 | */ |
32874aea |
200 | static int sftp_ls_compare(const void *av, const void *bv) |
201 | { |
202 | const struct fxp_name *a = (const struct fxp_name *) av; |
203 | const struct fxp_name *b = (const struct fxp_name *) bv; |
4c7f0d61 |
204 | return strcmp(a->filename, b->filename); |
205 | } |
32874aea |
206 | int sftp_cmd_ls(struct sftp_command *cmd) |
207 | { |
4c7f0d61 |
208 | struct fxp_handle *dirh; |
209 | struct fxp_names *names; |
210 | struct fxp_name *ournames; |
211 | int nnames, namesize; |
212 | char *dir, *cdir; |
213 | int i; |
214 | |
215 | if (cmd->nwords < 2) |
216 | dir = "."; |
217 | else |
218 | dir = cmd->words[1]; |
219 | |
220 | cdir = canonify(dir); |
221 | if (!cdir) { |
222 | printf("%s: %s\n", dir, fxp_error()); |
223 | return 0; |
224 | } |
225 | |
226 | printf("Listing directory %s\n", cdir); |
227 | |
228 | dirh = fxp_opendir(cdir); |
229 | if (dirh == NULL) { |
230 | printf("Unable to open %s: %s\n", dir, fxp_error()); |
231 | } else { |
232 | nnames = namesize = 0; |
233 | ournames = NULL; |
234 | |
235 | while (1) { |
236 | |
237 | names = fxp_readdir(dirh); |
238 | if (names == NULL) { |
239 | if (fxp_error_type() == SSH_FX_EOF) |
240 | break; |
241 | printf("Reading directory %s: %s\n", dir, fxp_error()); |
242 | break; |
243 | } |
244 | if (names->nnames == 0) { |
245 | fxp_free_names(names); |
246 | break; |
247 | } |
248 | |
249 | if (nnames + names->nnames >= namesize) { |
250 | namesize += names->nnames + 128; |
32874aea |
251 | ournames = |
252 | srealloc(ournames, namesize * sizeof(*ournames)); |
4c7f0d61 |
253 | } |
254 | |
255 | for (i = 0; i < names->nnames; i++) |
256 | ournames[nnames++] = names->names[i]; |
257 | |
258 | names->nnames = 0; /* prevent free_names */ |
259 | fxp_free_names(names); |
260 | } |
261 | fxp_close(dirh); |
262 | |
263 | /* |
264 | * Now we have our filenames. Sort them by actual file |
265 | * name, and then output the longname parts. |
266 | */ |
267 | qsort(ournames, nnames, sizeof(*ournames), sftp_ls_compare); |
268 | |
269 | /* |
270 | * And print them. |
271 | */ |
272 | for (i = 0; i < nnames; i++) |
273 | printf("%s\n", ournames[i].longname); |
274 | } |
275 | |
276 | sfree(cdir); |
277 | |
278 | return 0; |
279 | } |
280 | |
281 | /* |
282 | * Change directories. We do this by canonifying the new name, then |
283 | * trying to OPENDIR it. Only if that succeeds do we set the new pwd. |
284 | */ |
32874aea |
285 | int sftp_cmd_cd(struct sftp_command *cmd) |
286 | { |
4c7f0d61 |
287 | struct fxp_handle *dirh; |
288 | char *dir; |
289 | |
290 | if (cmd->nwords < 2) |
f9e162aa |
291 | dir = dupstr(homedir); |
4c7f0d61 |
292 | else |
293 | dir = canonify(cmd->words[1]); |
294 | |
295 | if (!dir) { |
296 | printf("%s: %s\n", dir, fxp_error()); |
297 | return 0; |
298 | } |
299 | |
300 | dirh = fxp_opendir(dir); |
301 | if (!dirh) { |
302 | printf("Directory %s: %s\n", dir, fxp_error()); |
303 | sfree(dir); |
304 | return 0; |
305 | } |
306 | |
307 | fxp_close(dirh); |
308 | |
309 | sfree(pwd); |
310 | pwd = dir; |
311 | printf("Remote directory is now %s\n", pwd); |
312 | |
313 | return 0; |
314 | } |
315 | |
316 | /* |
317 | * Get a file and save it at the local end. |
318 | */ |
32874aea |
319 | int sftp_cmd_get(struct sftp_command *cmd) |
320 | { |
4c7f0d61 |
321 | struct fxp_handle *fh; |
322 | char *fname, *outfname; |
323 | uint64 offset; |
324 | FILE *fp; |
325 | |
326 | if (cmd->nwords < 2) { |
327 | printf("get: expects a filename\n"); |
328 | return 0; |
329 | } |
330 | |
331 | fname = canonify(cmd->words[1]); |
332 | if (!fname) { |
333 | printf("%s: %s\n", cmd->words[1], fxp_error()); |
334 | return 0; |
335 | } |
336 | outfname = (cmd->nwords == 2 ? cmd->words[1] : cmd->words[2]); |
337 | |
338 | fh = fxp_open(fname, SSH_FXF_READ); |
339 | if (!fh) { |
340 | printf("%s: %s\n", fname, fxp_error()); |
341 | sfree(fname); |
342 | return 0; |
343 | } |
344 | fp = fopen(outfname, "wb"); |
345 | if (!fp) { |
346 | printf("local: unable to open %s\n", outfname); |
32874aea |
347 | fxp_close(fh); |
4c7f0d61 |
348 | sfree(fname); |
349 | return 0; |
350 | } |
351 | |
352 | printf("remote:%s => local:%s\n", fname, outfname); |
353 | |
32874aea |
354 | offset = uint64_make(0, 0); |
4c7f0d61 |
355 | |
356 | /* |
357 | * FIXME: we can use FXP_FSTAT here to get the file size, and |
358 | * thus put up a progress bar. |
359 | */ |
360 | while (1) { |
361 | char buffer[4096]; |
362 | int len; |
363 | int wpos, wlen; |
364 | |
365 | len = fxp_read(fh, buffer, offset, sizeof(buffer)); |
32874aea |
366 | if ((len == -1 && fxp_error_type() == SSH_FX_EOF) || len == 0) |
4c7f0d61 |
367 | break; |
368 | if (len == -1) { |
369 | printf("error while reading: %s\n", fxp_error()); |
370 | break; |
371 | } |
32874aea |
372 | |
4c7f0d61 |
373 | wpos = 0; |
374 | while (wpos < len) { |
32874aea |
375 | wlen = fwrite(buffer, 1, len - wpos, fp); |
4c7f0d61 |
376 | if (wlen <= 0) { |
377 | printf("error while writing local file\n"); |
378 | break; |
379 | } |
380 | wpos += wlen; |
381 | } |
382 | if (wpos < len) /* we had an error */ |
383 | break; |
384 | offset = uint64_add32(offset, len); |
385 | } |
386 | |
387 | fclose(fp); |
388 | fxp_close(fh); |
389 | sfree(fname); |
390 | |
391 | return 0; |
392 | } |
393 | |
394 | /* |
395 | * Send a file and store it at the remote end. |
396 | */ |
32874aea |
397 | int sftp_cmd_put(struct sftp_command *cmd) |
398 | { |
4c7f0d61 |
399 | struct fxp_handle *fh; |
400 | char *fname, *origoutfname, *outfname; |
401 | uint64 offset; |
402 | FILE *fp; |
403 | |
404 | if (cmd->nwords < 2) { |
405 | printf("put: expects a filename\n"); |
406 | return 0; |
407 | } |
408 | |
409 | fname = cmd->words[1]; |
410 | origoutfname = (cmd->nwords == 2 ? cmd->words[1] : cmd->words[2]); |
411 | outfname = canonify(origoutfname); |
f9e162aa |
412 | if (!outfname) { |
4c7f0d61 |
413 | printf("%s: %s\n", origoutfname, fxp_error()); |
414 | return 0; |
415 | } |
416 | |
417 | fp = fopen(fname, "rb"); |
418 | if (!fp) { |
419 | printf("local: unable to open %s\n", fname); |
4c7f0d61 |
420 | sfree(outfname); |
421 | return 0; |
422 | } |
423 | fh = fxp_open(outfname, SSH_FXF_WRITE | SSH_FXF_CREAT | SSH_FXF_TRUNC); |
424 | if (!fh) { |
425 | printf("%s: %s\n", outfname, fxp_error()); |
426 | sfree(outfname); |
427 | return 0; |
428 | } |
429 | |
430 | printf("local:%s => remote:%s\n", fname, outfname); |
431 | |
32874aea |
432 | offset = uint64_make(0, 0); |
4c7f0d61 |
433 | |
434 | /* |
435 | * FIXME: we can use FXP_FSTAT here to get the file size, and |
436 | * thus put up a progress bar. |
437 | */ |
438 | while (1) { |
439 | char buffer[4096]; |
440 | int len; |
441 | |
f9e162aa |
442 | len = fread(buffer, 1, sizeof(buffer), fp); |
4c7f0d61 |
443 | if (len == -1) { |
444 | printf("error while reading local file\n"); |
445 | break; |
446 | } else if (len == 0) { |
447 | break; |
448 | } |
f9e162aa |
449 | if (!fxp_write(fh, buffer, offset, len)) { |
4c7f0d61 |
450 | printf("error while writing: %s\n", fxp_error()); |
451 | break; |
452 | } |
453 | offset = uint64_add32(offset, len); |
454 | } |
455 | |
456 | fxp_close(fh); |
457 | fclose(fp); |
458 | sfree(outfname); |
459 | |
460 | return 0; |
461 | } |
462 | |
463 | static struct sftp_cmd_lookup { |
464 | char *name; |
32874aea |
465 | int (*obey) (struct sftp_command *); |
4c7f0d61 |
466 | } sftp_lookup[] = { |
467 | /* |
468 | * List of sftp commands. This is binary-searched so it MUST be |
469 | * in ASCII order. |
470 | */ |
32874aea |
471 | { |
472 | "bye", sftp_cmd_quit}, { |
473 | "cd", sftp_cmd_cd}, { |
474 | "dir", sftp_cmd_ls}, { |
475 | "exit", sftp_cmd_quit}, { |
476 | "get", sftp_cmd_get}, { |
477 | "ls", sftp_cmd_ls}, { |
478 | "put", sftp_cmd_put}, { |
479 | "quit", sftp_cmd_quit},}; |
4c7f0d61 |
480 | |
481 | /* ---------------------------------------------------------------------- |
482 | * Command line reading and parsing. |
483 | */ |
32874aea |
484 | struct sftp_command *sftp_getcmd(void) |
485 | { |
4c7f0d61 |
486 | char *line; |
487 | int linelen, linesize; |
488 | struct sftp_command *cmd; |
489 | char *p, *q, *r; |
490 | int quoting; |
491 | |
492 | printf("psftp> "); |
493 | fflush(stdout); |
494 | |
495 | cmd = smalloc(sizeof(struct sftp_command)); |
496 | cmd->words = NULL; |
497 | cmd->nwords = 0; |
498 | cmd->wordssize = 0; |
499 | |
500 | line = NULL; |
501 | linesize = linelen = 0; |
502 | while (1) { |
503 | int len; |
504 | char *ret; |
505 | |
506 | linesize += 512; |
507 | line = srealloc(line, linesize); |
32874aea |
508 | ret = fgets(line + linelen, linesize - linelen, stdin); |
4c7f0d61 |
509 | |
510 | if (!ret || (linelen == 0 && line[0] == '\0')) { |
511 | cmd->obey = sftp_cmd_quit; |
512 | printf("quit\n"); |
513 | return cmd; /* eof */ |
514 | } |
32874aea |
515 | len = linelen + strlen(line + linelen); |
4c7f0d61 |
516 | linelen += len; |
32874aea |
517 | if (line[linelen - 1] == '\n') { |
4c7f0d61 |
518 | linelen--; |
519 | line[linelen] = '\0'; |
520 | break; |
521 | } |
522 | } |
523 | |
524 | /* |
525 | * Parse the command line into words. The syntax is: |
526 | * - double quotes are removed, but cause spaces within to be |
527 | * treated as non-separating. |
528 | * - a double-doublequote pair is a literal double quote, inside |
529 | * _or_ outside quotes. Like this: |
530 | * |
531 | * firstword "second word" "this has ""quotes"" in" sodoes""this"" |
532 | * |
533 | * becomes |
534 | * |
535 | * >firstword< |
536 | * >second word< |
537 | * >this has "quotes" in< |
538 | * >sodoes"this"< |
539 | */ |
540 | p = line; |
541 | while (*p) { |
542 | /* skip whitespace */ |
32874aea |
543 | while (*p && (*p == ' ' || *p == '\t')) |
544 | p++; |
4c7f0d61 |
545 | /* mark start of word */ |
546 | q = r = p; /* q sits at start, r writes word */ |
547 | quoting = 0; |
548 | while (*p) { |
549 | if (!quoting && (*p == ' ' || *p == '\t')) |
550 | break; /* reached end of word */ |
551 | else if (*p == '"' && p[1] == '"') |
32874aea |
552 | p += 2, *r++ = '"'; /* a literal quote */ |
4c7f0d61 |
553 | else if (*p == '"') |
554 | p++, quoting = !quoting; |
555 | else |
556 | *r++ = *p++; |
557 | } |
32874aea |
558 | if (*p) |
559 | p++; /* skip over the whitespace */ |
4c7f0d61 |
560 | *r = '\0'; |
561 | if (cmd->nwords >= cmd->wordssize) { |
562 | cmd->wordssize = cmd->nwords + 16; |
32874aea |
563 | cmd->words = |
564 | srealloc(cmd->words, cmd->wordssize * sizeof(char *)); |
4c7f0d61 |
565 | } |
566 | cmd->words[cmd->nwords++] = q; |
567 | } |
568 | |
569 | /* |
570 | * Now parse the first word and assign a function. |
571 | */ |
572 | |
573 | if (cmd->nwords == 0) |
574 | cmd->obey = sftp_cmd_null; |
575 | else { |
576 | int i, j, k, cmp; |
577 | |
578 | cmd->obey = sftp_cmd_unknown; |
579 | |
580 | i = -1; |
581 | j = sizeof(sftp_lookup) / sizeof(*sftp_lookup); |
582 | while (j - i > 1) { |
583 | k = (j + i) / 2; |
584 | cmp = strcmp(cmd->words[0], sftp_lookup[k].name); |
585 | if (cmp < 0) |
586 | j = k; |
587 | else if (cmp > 0) |
588 | i = k; |
589 | else { |
590 | cmd->obey = sftp_lookup[k].obey; |
591 | break; |
592 | } |
593 | } |
594 | } |
595 | |
596 | return cmd; |
597 | } |
598 | |
32874aea |
599 | void do_sftp(void) |
600 | { |
4c7f0d61 |
601 | /* |
602 | * Do protocol initialisation. |
603 | */ |
604 | if (!fxp_init()) { |
605 | fprintf(stderr, |
32874aea |
606 | "Fatal: unable to initialise SFTP: %s\n", fxp_error()); |
0d694692 |
607 | return; |
4c7f0d61 |
608 | } |
609 | |
610 | /* |
611 | * Find out where our home directory is. |
612 | */ |
f9e162aa |
613 | homedir = fxp_realpath("."); |
4c7f0d61 |
614 | if (!homedir) { |
615 | fprintf(stderr, |
616 | "Warning: failed to resolve home directory: %s\n", |
617 | fxp_error()); |
618 | homedir = dupstr("."); |
619 | } else { |
620 | printf("Remote working directory is %s\n", homedir); |
621 | } |
622 | pwd = dupstr(homedir); |
623 | |
624 | /* ------------------------------------------------------------------ |
625 | * Now we're ready to do Real Stuff. |
626 | */ |
627 | while (1) { |
628 | struct sftp_command *cmd; |
629 | cmd = sftp_getcmd(); |
630 | if (!cmd) |
631 | break; |
632 | if (cmd->obey(cmd) < 0) |
633 | break; |
634 | } |
4a8fc3c4 |
635 | } |
4c7f0d61 |
636 | |
4a8fc3c4 |
637 | /* ---------------------------------------------------------------------- |
638 | * Dirty bits: integration with PuTTY. |
639 | */ |
640 | |
641 | static int verbose = 0; |
642 | |
643 | void verify_ssh_host_key(char *host, int port, char *keytype, |
32874aea |
644 | char *keystr, char *fingerprint) |
645 | { |
4a8fc3c4 |
646 | int ret; |
647 | |
648 | static const char absentmsg[] = |
32874aea |
649 | "The server's host key is not cached in the registry. You\n" |
650 | "have no guarantee that the server is the computer you\n" |
651 | "think it is.\n" |
652 | "The server's key fingerprint is:\n" |
653 | "%s\n" |
654 | "If you trust this host, enter \"y\" to add the key to\n" |
655 | "PuTTY's cache and carry on connecting.\n" |
656 | "If you do not trust this host, enter \"n\" to abandon the\n" |
657 | "connection.\n" "Continue connecting? (y/n) "; |
4a8fc3c4 |
658 | |
659 | static const char wrongmsg[] = |
32874aea |
660 | "WARNING - POTENTIAL SECURITY BREACH!\n" |
661 | "The server's host key does not match the one PuTTY has\n" |
662 | "cached in the registry. This means that either the\n" |
663 | "server administrator has changed the host key, or you\n" |
664 | "have actually connected to another computer pretending\n" |
665 | "to be the server.\n" |
666 | "The new key fingerprint is:\n" |
667 | "%s\n" |
668 | "If you were expecting this change and trust the new key,\n" |
669 | "enter Yes to update PuTTY's cache and continue connecting.\n" |
670 | "If you want to carry on connecting but without updating\n" |
671 | "the cache, enter No.\n" |
672 | "If you want to abandon the connection completely, press\n" |
673 | "Return to cancel. Pressing Return is the ONLY guaranteed\n" |
674 | "safe choice.\n" |
675 | "Update cached key? (y/n, Return cancels connection) "; |
4a8fc3c4 |
676 | |
677 | static const char abandoned[] = "Connection abandoned.\n"; |
678 | |
679 | char line[32]; |
680 | |
681 | /* |
682 | * Verify the key against the registry. |
683 | */ |
684 | ret = verify_host_key(host, port, keytype, keystr); |
685 | |
32874aea |
686 | if (ret == 0) /* success - key matched OK */ |
687 | return; |
688 | if (ret == 2) { /* key was different */ |
689 | fprintf(stderr, wrongmsg, fingerprint); |
690 | if (fgets(line, sizeof(line), stdin) && |
691 | line[0] != '\0' && line[0] != '\n') { |
692 | if (line[0] == 'y' || line[0] == 'Y') |
693 | store_host_key(host, port, keytype, keystr); |
694 | } else { |
695 | fprintf(stderr, abandoned); |
696 | exit(0); |
697 | } |
4a8fc3c4 |
698 | } |
32874aea |
699 | if (ret == 1) { /* key was absent */ |
700 | fprintf(stderr, absentmsg, fingerprint); |
701 | if (fgets(line, sizeof(line), stdin) && |
702 | (line[0] == 'y' || line[0] == 'Y')) |
703 | store_host_key(host, port, keytype, keystr); |
704 | else { |
705 | fprintf(stderr, abandoned); |
706 | exit(0); |
707 | } |
4a8fc3c4 |
708 | } |
709 | } |
710 | |
711 | /* |
712 | * Print an error message and perform a fatal exit. |
713 | */ |
714 | void fatalbox(char *fmt, ...) |
715 | { |
32874aea |
716 | char str[0x100]; /* Make the size big enough */ |
4a8fc3c4 |
717 | va_list ap; |
718 | va_start(ap, fmt); |
719 | strcpy(str, "Fatal:"); |
32874aea |
720 | vsprintf(str + strlen(str), fmt, ap); |
4a8fc3c4 |
721 | va_end(ap); |
722 | strcat(str, "\n"); |
723 | fprintf(stderr, str); |
724 | |
725 | exit(1); |
726 | } |
727 | void connection_fatal(char *fmt, ...) |
728 | { |
32874aea |
729 | char str[0x100]; /* Make the size big enough */ |
4a8fc3c4 |
730 | va_list ap; |
731 | va_start(ap, fmt); |
732 | strcpy(str, "Fatal:"); |
32874aea |
733 | vsprintf(str + strlen(str), fmt, ap); |
4a8fc3c4 |
734 | va_end(ap); |
735 | strcat(str, "\n"); |
736 | fprintf(stderr, str); |
737 | |
738 | exit(1); |
739 | } |
740 | |
32874aea |
741 | void logevent(char *string) |
742 | { |
743 | } |
4a8fc3c4 |
744 | |
32874aea |
745 | void ldisc_send(char *buf, int len) |
746 | { |
4a8fc3c4 |
747 | /* |
748 | * This is only here because of the calls to ldisc_send(NULL, |
749 | * 0) in ssh.c. Nothing in PSFTP actually needs to use the |
750 | * ldisc as an ldisc. So if we get called with any real data, I |
751 | * want to know about it. |
4c7f0d61 |
752 | */ |
4a8fc3c4 |
753 | assert(len == 0); |
754 | } |
755 | |
756 | /* |
757 | * Be told what socket we're supposed to be using. |
758 | */ |
759 | static SOCKET sftp_ssh_socket; |
32874aea |
760 | char *do_select(SOCKET skt, int startup) |
761 | { |
4a8fc3c4 |
762 | if (startup) |
763 | sftp_ssh_socket = skt; |
764 | else |
765 | sftp_ssh_socket = INVALID_SOCKET; |
766 | return NULL; |
4c7f0d61 |
767 | } |
4a8fc3c4 |
768 | extern int select_result(WPARAM, LPARAM); |
769 | |
770 | /* |
771 | * Receive a block of data from the SSH link. Block until all data |
772 | * is available. |
773 | * |
774 | * To do this, we repeatedly call the SSH protocol module, with our |
775 | * own trap in from_backend() to catch the data that comes back. We |
776 | * do this until we have enough data. |
777 | */ |
778 | |
32874aea |
779 | static unsigned char *outptr; /* where to put the data */ |
780 | static unsigned outlen; /* how much data required */ |
4a8fc3c4 |
781 | static unsigned char *pending = NULL; /* any spare data */ |
32874aea |
782 | static unsigned pendlen = 0, pendsize = 0; /* length and phys. size of buffer */ |
783 | void from_backend(int is_stderr, char *data, int datalen) |
784 | { |
785 | unsigned char *p = (unsigned char *) data; |
786 | unsigned len = (unsigned) datalen; |
4a8fc3c4 |
787 | |
788 | /* |
789 | * stderr data is just spouted to local stderr and otherwise |
790 | * ignored. |
791 | */ |
792 | if (is_stderr) { |
793 | fwrite(data, 1, len, stderr); |
794 | return; |
795 | } |
796 | |
797 | /* |
798 | * If this is before the real session begins, just return. |
799 | */ |
800 | if (!outptr) |
32874aea |
801 | return; |
4a8fc3c4 |
802 | |
803 | if (outlen > 0) { |
32874aea |
804 | unsigned used = outlen; |
805 | if (used > len) |
806 | used = len; |
807 | memcpy(outptr, p, used); |
808 | outptr += used; |
809 | outlen -= used; |
810 | p += used; |
811 | len -= used; |
4a8fc3c4 |
812 | } |
813 | |
814 | if (len > 0) { |
32874aea |
815 | if (pendsize < pendlen + len) { |
816 | pendsize = pendlen + len + 4096; |
817 | pending = (pending ? srealloc(pending, pendsize) : |
818 | smalloc(pendsize)); |
819 | if (!pending) |
820 | fatalbox("Out of memory"); |
821 | } |
822 | memcpy(pending + pendlen, p, len); |
823 | pendlen += len; |
4a8fc3c4 |
824 | } |
825 | } |
32874aea |
826 | int sftp_recvdata(char *buf, int len) |
827 | { |
828 | outptr = (unsigned char *) buf; |
4a8fc3c4 |
829 | outlen = len; |
830 | |
831 | /* |
832 | * See if the pending-input block contains some of what we |
833 | * need. |
834 | */ |
835 | if (pendlen > 0) { |
32874aea |
836 | unsigned pendused = pendlen; |
837 | if (pendused > outlen) |
838 | pendused = outlen; |
4a8fc3c4 |
839 | memcpy(outptr, pending, pendused); |
32874aea |
840 | memmove(pending, pending + pendused, pendlen - pendused); |
4a8fc3c4 |
841 | outptr += pendused; |
842 | outlen -= pendused; |
32874aea |
843 | pendlen -= pendused; |
844 | if (pendlen == 0) { |
845 | pendsize = 0; |
846 | sfree(pending); |
847 | pending = NULL; |
848 | } |
849 | if (outlen == 0) |
850 | return 1; |
4a8fc3c4 |
851 | } |
852 | |
853 | while (outlen > 0) { |
32874aea |
854 | fd_set readfds; |
4a8fc3c4 |
855 | |
32874aea |
856 | FD_ZERO(&readfds); |
857 | FD_SET(sftp_ssh_socket, &readfds); |
858 | if (select(1, &readfds, NULL, NULL, NULL) < 0) |
859 | return 0; /* doom */ |
860 | select_result((WPARAM) sftp_ssh_socket, (LPARAM) FD_READ); |
4a8fc3c4 |
861 | } |
862 | |
863 | return 1; |
864 | } |
32874aea |
865 | int sftp_senddata(char *buf, int len) |
866 | { |
867 | back->send((unsigned char *) buf, len); |
4a8fc3c4 |
868 | return 1; |
869 | } |
870 | |
871 | /* |
872 | * Loop through the ssh connection and authentication process. |
873 | */ |
32874aea |
874 | static void ssh_sftp_init(void) |
875 | { |
4a8fc3c4 |
876 | if (sftp_ssh_socket == INVALID_SOCKET) |
877 | return; |
878 | while (!back->sendok()) { |
32874aea |
879 | fd_set readfds; |
880 | FD_ZERO(&readfds); |
881 | FD_SET(sftp_ssh_socket, &readfds); |
882 | if (select(1, &readfds, NULL, NULL, NULL) < 0) |
883 | return; /* doom */ |
884 | select_result((WPARAM) sftp_ssh_socket, (LPARAM) FD_READ); |
4a8fc3c4 |
885 | } |
886 | } |
887 | |
888 | static char *password = NULL; |
fa17a66e |
889 | static int get_line(const char *prompt, char *str, int maxlen, int is_pw) |
4a8fc3c4 |
890 | { |
891 | HANDLE hin, hout; |
fa17a66e |
892 | DWORD savemode, newmode, i; |
4a8fc3c4 |
893 | |
894 | if (password) { |
32874aea |
895 | static int tried_once = 0; |
896 | |
897 | if (tried_once) { |
898 | return 0; |
899 | } else { |
900 | strncpy(str, password, maxlen); |
901 | str[maxlen - 1] = '\0'; |
902 | tried_once = 1; |
903 | return 1; |
904 | } |
4a8fc3c4 |
905 | } |
906 | |
907 | hin = GetStdHandle(STD_INPUT_HANDLE); |
908 | hout = GetStdHandle(STD_OUTPUT_HANDLE); |
909 | if (hin == INVALID_HANDLE_VALUE || hout == INVALID_HANDLE_VALUE) { |
910 | fprintf(stderr, "Cannot get standard input/output handles\n"); |
911 | exit(1); |
912 | } |
913 | |
914 | GetConsoleMode(hin, &savemode); |
fa17a66e |
915 | newmode = savemode | ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT; |
916 | if (is_pw) |
32874aea |
917 | newmode &= ~ENABLE_ECHO_INPUT; |
fa17a66e |
918 | else |
32874aea |
919 | newmode |= ENABLE_ECHO_INPUT; |
fa17a66e |
920 | SetConsoleMode(hin, newmode); |
4a8fc3c4 |
921 | |
922 | WriteFile(hout, prompt, strlen(prompt), &i, NULL); |
32874aea |
923 | ReadFile(hin, str, maxlen - 1, &i, NULL); |
4a8fc3c4 |
924 | |
925 | SetConsoleMode(hin, savemode); |
926 | |
32874aea |
927 | if ((int) i > maxlen) |
928 | i = maxlen - 1; |
929 | else |
930 | i = i - 2; |
4a8fc3c4 |
931 | str[i] = '\0'; |
932 | |
fa17a66e |
933 | if (is_pw) |
32874aea |
934 | WriteFile(hout, "\r\n", 2, &i, NULL); |
4a8fc3c4 |
935 | |
936 | return 1; |
937 | } |
938 | |
939 | /* |
940 | * Initialize the Win$ock driver. |
941 | */ |
942 | static void init_winsock(void) |
943 | { |
944 | WORD winsock_ver; |
945 | WSADATA wsadata; |
946 | |
947 | winsock_ver = MAKEWORD(1, 1); |
948 | if (WSAStartup(winsock_ver, &wsadata)) { |
949 | fprintf(stderr, "Unable to initialise WinSock"); |
950 | exit(1); |
951 | } |
32874aea |
952 | if (LOBYTE(wsadata.wVersion) != 1 || HIBYTE(wsadata.wVersion) != 1) { |
4a8fc3c4 |
953 | fprintf(stderr, "WinSock version is incompatible with 1.1"); |
954 | exit(1); |
955 | } |
956 | } |
957 | |
958 | /* |
959 | * Short description of parameters. |
960 | */ |
961 | static void usage(void) |
962 | { |
963 | printf("PuTTY Secure File Transfer (SFTP) client\n"); |
964 | printf("%s\n", ver); |
965 | printf("Usage: psftp [options] user@host\n"); |
966 | printf("Options:\n"); |
967 | printf(" -v show verbose messages\n"); |
968 | printf(" -P port connect to specified port\n"); |
969 | printf(" -pw passw login with specified password\n"); |
970 | exit(1); |
971 | } |
972 | |
973 | /* |
974 | * Main program. Parse arguments etc. |
975 | */ |
976 | int main(int argc, char *argv[]) |
977 | { |
978 | int i; |
979 | int portnumber = 0; |
980 | char *user, *host, *userhost, *realhost; |
981 | char *err; |
982 | |
983 | flags = FLAG_STDERR; |
fa17a66e |
984 | ssh_get_line = &get_line; |
4a8fc3c4 |
985 | init_winsock(); |
986 | sk_init(); |
987 | |
988 | userhost = user = NULL; |
989 | |
990 | for (i = 1; i < argc; i++) { |
991 | if (argv[i][0] != '-') { |
992 | if (userhost) |
993 | usage(); |
994 | else |
995 | userhost = dupstr(argv[i]); |
996 | } else if (strcmp(argv[i], "-v") == 0) { |
997 | verbose = 1, flags |= FLAG_VERBOSE; |
998 | } else if (strcmp(argv[i], "-h") == 0 || |
999 | strcmp(argv[i], "-?") == 0) { |
1000 | usage(); |
32874aea |
1001 | } else if (strcmp(argv[i], "-l") == 0 && i + 1 < argc) { |
4a8fc3c4 |
1002 | user = argv[++i]; |
32874aea |
1003 | } else if (strcmp(argv[i], "-P") == 0 && i + 1 < argc) { |
4a8fc3c4 |
1004 | portnumber = atoi(argv[++i]); |
32874aea |
1005 | } else if (strcmp(argv[i], "-pw") == 0 && i + 1 < argc) { |
4a8fc3c4 |
1006 | password = argv[++i]; |
1007 | } else if (strcmp(argv[i], "--") == 0) { |
1008 | i++; |
1009 | break; |
1010 | } else { |
1011 | usage(); |
1012 | } |
1013 | } |
1014 | argc -= i; |
1015 | argv += i; |
1016 | back = NULL; |
1017 | |
1018 | if (argc > 0 || !userhost) |
1019 | usage(); |
1020 | |
1021 | /* Separate host and username */ |
1022 | host = userhost; |
1023 | host = strrchr(host, '@'); |
1024 | if (host == NULL) { |
1025 | host = userhost; |
1026 | } else { |
1027 | *host++ = '\0'; |
1028 | if (user) { |
32874aea |
1029 | printf("psftp: multiple usernames specified; using \"%s\"\n", |
1030 | user); |
4a8fc3c4 |
1031 | } else |
1032 | user = userhost; |
1033 | } |
1034 | |
1035 | /* Try to load settings for this host */ |
1036 | do_defaults(host, &cfg); |
1037 | if (cfg.host[0] == '\0') { |
1038 | /* No settings for this host; use defaults */ |
32874aea |
1039 | do_defaults(NULL, &cfg); |
1040 | strncpy(cfg.host, host, sizeof(cfg.host) - 1); |
1041 | cfg.host[sizeof(cfg.host) - 1] = '\0'; |
4a8fc3c4 |
1042 | cfg.port = 22; |
1043 | } |
1044 | |
1045 | /* Set username */ |
1046 | if (user != NULL && user[0] != '\0') { |
32874aea |
1047 | strncpy(cfg.username, user, sizeof(cfg.username) - 1); |
1048 | cfg.username[sizeof(cfg.username) - 1] = '\0'; |
4a8fc3c4 |
1049 | } |
1050 | if (!cfg.username[0]) { |
1051 | printf("login as: "); |
1052 | if (!fgets(cfg.username, sizeof(cfg.username), stdin)) { |
1053 | fprintf(stderr, "psftp: aborting\n"); |
1054 | exit(1); |
1055 | } else { |
1056 | int len = strlen(cfg.username); |
32874aea |
1057 | if (cfg.username[len - 1] == '\n') |
1058 | cfg.username[len - 1] = '\0'; |
4a8fc3c4 |
1059 | } |
1060 | } |
1061 | |
1062 | if (cfg.protocol != PROT_SSH) |
1063 | cfg.port = 22; |
1064 | |
1065 | if (portnumber) |
1066 | cfg.port = portnumber; |
1067 | |
1068 | /* SFTP uses SSH2 by default always */ |
1069 | cfg.sshprot = 2; |
1070 | |
1071 | /* Set up subsystem name. FIXME: fudge for SSH1. */ |
1072 | strcpy(cfg.remote_cmd, "sftp"); |
1073 | cfg.ssh_subsys = TRUE; |
1074 | cfg.nopty = TRUE; |
1075 | |
1076 | back = &ssh_backend; |
1077 | |
1078 | err = back->init(cfg.host, cfg.port, &realhost); |
1079 | if (err != NULL) { |
1080 | fprintf(stderr, "ssh_init: %s", err); |
1081 | return 1; |
1082 | } |
1083 | ssh_sftp_init(); |
1084 | if (verbose && realhost != NULL) |
1085 | printf("Connected to %s\n", realhost); |
4c7f0d61 |
1086 | |
4c7f0d61 |
1087 | do_sftp(); |
4a8fc3c4 |
1088 | |
1089 | if (back != NULL && back->socket() != NULL) { |
1090 | char ch; |
1091 | back->special(TS_EOF); |
1092 | sftp_recvdata(&ch, 1); |
1093 | } |
1094 | WSACleanup(); |
1095 | random_save_seed(); |
1096 | |
4c7f0d61 |
1097 | return 0; |
1098 | } |