12dc4ec0 |
1 | /* |
2 | * PLink - a command-line (stdin/stdout) variant of PuTTY. |
3 | */ |
4 | |
4d331a77 |
5 | #ifndef AUTO_WINSOCK |
12dc4ec0 |
6 | #include <winsock2.h> |
4d331a77 |
7 | #endif |
12dc4ec0 |
8 | #include <windows.h> |
9 | #include <stdio.h> |
10 | #include <stdarg.h> |
11 | |
12 | #define PUTTY_DO_GLOBALS /* actually _define_ globals */ |
13 | #include "putty.h" |
a9422f39 |
14 | #include "storage.h" |
12dc4ec0 |
15 | |
16 | void fatalbox (char *p, ...) { |
17 | va_list ap; |
18 | fprintf(stderr, "FATAL ERROR: ", p); |
19 | va_start(ap, p); |
20 | vfprintf(stderr, p, ap); |
21 | va_end(ap); |
22 | fputc('\n', stderr); |
23 | WSACleanup(); |
24 | exit(1); |
25 | } |
8d5de777 |
26 | void connection_fatal (char *p, ...) { |
27 | va_list ap; |
28 | fprintf(stderr, "FATAL ERROR: ", p); |
29 | va_start(ap, p); |
30 | vfprintf(stderr, p, ap); |
31 | va_end(ap); |
32 | fputc('\n', stderr); |
33 | WSACleanup(); |
34 | exit(1); |
35 | } |
12dc4ec0 |
36 | |
d8426c54 |
37 | static char *password = NULL; |
38 | |
a9422f39 |
39 | void logevent(char *string) { } |
40 | |
41 | void verify_ssh_host_key(char *host, int port, char *keytype, |
42 | char *keystr, char *fingerprint) { |
43 | int ret; |
fcbb94d3 |
44 | HANDLE hin; |
45 | DWORD savemode, i; |
a9422f39 |
46 | |
47 | static const char absentmsg[] = |
48 | "The server's host key is not cached in the registry. You\n" |
49 | "have no guarantee that the server is the computer you\n" |
50 | "think it is.\n" |
51 | "The server's key fingerprint is:\n" |
52 | "%s\n" |
53 | "If you trust this host, enter \"y\" to add the key to\n" |
54 | "PuTTY's cache and carry on connecting.\n" |
55 | "If you do not trust this host, enter \"n\" to abandon the\n" |
56 | "connection.\n" |
57 | "Continue connecting? (y/n) "; |
58 | |
59 | static const char wrongmsg[] = |
60 | "WARNING - POTENTIAL SECURITY BREACH!\n" |
61 | "The server's host key does not match the one PuTTY has\n" |
62 | "cached in the registry. This means that either the\n" |
63 | "server administrator has changed the host key, or you\n" |
64 | "have actually connected to another computer pretending\n" |
65 | "to be the server.\n" |
66 | "The new key fingerprint is:\n" |
67 | "%s\n" |
68 | "If you were expecting this change and trust the new key,\n" |
69 | "enter \"y\" to update PuTTY's cache and continue connecting.\n" |
70 | "If you want to carry on connecting but without updating\n" |
71 | "the cache, enter \"n\".\n" |
72 | "If you want to abandon the connection completely, press\n" |
73 | "Return to cancel. Pressing Return is the ONLY guaranteed\n" |
74 | "safe choice.\n" |
75 | "Update cached key? (y/n, Return cancels connection) "; |
76 | |
77 | static const char abandoned[] = "Connection abandoned.\n"; |
78 | |
79 | char line[32]; |
80 | |
81 | /* |
82 | * Verify the key against the registry. |
83 | */ |
84 | ret = verify_host_key(host, port, keytype, keystr); |
85 | |
86 | if (ret == 0) /* success - key matched OK */ |
87 | return; |
fcbb94d3 |
88 | |
89 | if (ret == 2) /* key was different */ |
a9422f39 |
90 | fprintf(stderr, wrongmsg, fingerprint); |
fcbb94d3 |
91 | if (ret == 1) /* key was absent */ |
92 | fprintf(stderr, absentmsg, fingerprint); |
93 | |
94 | hin = GetStdHandle(STD_INPUT_HANDLE); |
95 | GetConsoleMode(hin, &savemode); |
96 | SetConsoleMode(hin, (savemode | ENABLE_ECHO_INPUT | |
97 | ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT)); |
98 | ReadFile(hin, line, sizeof(line)-1, &i, NULL); |
99 | SetConsoleMode(hin, savemode); |
100 | |
101 | if (ret == 2) { /* key was different */ |
102 | if (line[0] != '\0' && line[0] != '\r' && line[0] != '\n') { |
a9422f39 |
103 | if (line[0] == 'y' || line[0] == 'Y') |
104 | store_host_key(host, port, keytype, keystr); |
105 | } else { |
106 | fprintf(stderr, abandoned); |
107 | exit(0); |
108 | } |
109 | } |
110 | if (ret == 1) { /* key was absent */ |
fcbb94d3 |
111 | if (line[0] == 'y' || line[0] == 'Y') |
a9422f39 |
112 | store_host_key(host, port, keytype, keystr); |
113 | else { |
114 | fprintf(stderr, abandoned); |
115 | exit(0); |
116 | } |
117 | } |
118 | } |
989b10e9 |
119 | |
12dc4ec0 |
120 | HANDLE outhandle; |
6f34e365 |
121 | DWORD orig_console_mode; |
122 | |
123 | void begin_session(void) { |
124 | if (!cfg.ldisc_term) |
125 | SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), ENABLE_PROCESSED_INPUT); |
126 | else |
127 | SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), orig_console_mode); |
128 | } |
12dc4ec0 |
129 | |
130 | void term_out(void) |
131 | { |
132 | int reap; |
133 | DWORD ret; |
12dc4ec0 |
134 | reap = 0; |
135 | while (reap < inbuf_head) { |
136 | if (!WriteFile(outhandle, inbuf+reap, inbuf_head-reap, &ret, NULL)) |
137 | return; /* give up in panic */ |
138 | reap += ret; |
139 | } |
140 | inbuf_head = 0; |
141 | } |
142 | |
143 | struct input_data { |
144 | DWORD len; |
145 | char buffer[4096]; |
146 | HANDLE event; |
147 | }; |
148 | |
67779be7 |
149 | static int get_password(const char *prompt, char *str, int maxlen) |
150 | { |
151 | HANDLE hin, hout; |
152 | DWORD savemode, i; |
153 | |
67779be7 |
154 | if (password) { |
155 | static int tried_once = 0; |
156 | |
157 | if (tried_once) { |
158 | return 0; |
159 | } else { |
160 | strncpy(str, password, maxlen); |
161 | str[maxlen-1] = '\0'; |
162 | tried_once = 1; |
163 | return 1; |
164 | } |
165 | } |
67779be7 |
166 | |
167 | hin = GetStdHandle(STD_INPUT_HANDLE); |
168 | hout = GetStdHandle(STD_OUTPUT_HANDLE); |
169 | if (hin == INVALID_HANDLE_VALUE || hout == INVALID_HANDLE_VALUE) { |
170 | fprintf(stderr, "Cannot get standard input/output handles"); |
171 | return 0; |
172 | } |
173 | |
174 | GetConsoleMode(hin, &savemode); |
175 | SetConsoleMode(hin, (savemode & (~ENABLE_ECHO_INPUT)) | |
176 | ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT); |
177 | |
178 | WriteFile(hout, prompt, strlen(prompt), &i, NULL); |
179 | ReadFile(hin, str, maxlen-1, &i, NULL); |
180 | |
181 | SetConsoleMode(hin, savemode); |
182 | |
183 | if ((int)i > maxlen) i = maxlen-1; else i = i - 2; |
184 | str[i] = '\0'; |
185 | |
186 | WriteFile(hout, "\r\n", 2, &i, NULL); |
187 | |
188 | return 1; |
189 | } |
190 | |
6d2d5e8d |
191 | static DWORD WINAPI stdin_read_thread(void *param) { |
12dc4ec0 |
192 | struct input_data *idata = (struct input_data *)param; |
193 | HANDLE inhandle; |
194 | |
195 | inhandle = GetStdHandle(STD_INPUT_HANDLE); |
196 | |
197 | while (ReadFile(inhandle, idata->buffer, sizeof(idata->buffer), |
198 | &idata->len, NULL)) { |
199 | SetEvent(idata->event); |
200 | } |
201 | |
202 | idata->len = 0; |
203 | SetEvent(idata->event); |
204 | |
205 | return 0; |
206 | } |
207 | |
d8426c54 |
208 | /* |
209 | * Short description of parameters. |
210 | */ |
211 | static void usage(void) |
212 | { |
213 | printf("PuTTY Link: command-line connection utility\n"); |
214 | printf("%s\n", ver); |
215 | printf("Usage: plink [options] [user@]host [command]\n"); |
216 | printf("Options:\n"); |
217 | printf(" -v show verbose messages\n"); |
218 | printf(" -ssh force use of ssh protocol\n"); |
219 | printf(" -P port connect to specified port\n"); |
220 | printf(" -pw passw login with specified password\n"); |
221 | exit(1); |
222 | } |
223 | |
12dc4ec0 |
224 | int main(int argc, char **argv) { |
225 | WSADATA wsadata; |
226 | WORD winsock_ver; |
227 | WSAEVENT netevent, stdinevent; |
228 | HANDLE handles[2]; |
229 | SOCKET socket; |
230 | DWORD threadid; |
231 | struct input_data idata; |
232 | int sending; |
d8426c54 |
233 | int portnumber = -1; |
12dc4ec0 |
234 | |
67779be7 |
235 | ssh_get_password = get_password; |
236 | |
237 | flags = FLAG_STDERR; |
12dc4ec0 |
238 | /* |
239 | * Process the command line. |
240 | */ |
a9422f39 |
241 | do_defaults(NULL, &cfg); |
e7a7383f |
242 | default_protocol = cfg.protocol; |
243 | default_port = cfg.port; |
8cb9c947 |
244 | { |
245 | /* |
246 | * Override the default protocol if PLINK_PROTOCOL is set. |
247 | */ |
248 | char *p = getenv("PLINK_PROTOCOL"); |
249 | int i; |
250 | if (p) { |
251 | for (i = 0; backends[i].backend != NULL; i++) { |
252 | if (!strcmp(backends[i].name, p)) { |
253 | default_protocol = cfg.protocol = backends[i].protocol; |
254 | default_port = cfg.port = backends[i].backend->default_port; |
255 | break; |
256 | } |
257 | } |
258 | } |
259 | } |
12dc4ec0 |
260 | while (--argc) { |
261 | char *p = *++argv; |
262 | if (*p == '-') { |
263 | if (!strcmp(p, "-ssh")) { |
264 | default_protocol = cfg.protocol = PROT_SSH; |
265 | default_port = cfg.port = 22; |
9d33ebdd |
266 | } else if (!strcmp(p, "-telnet")) { |
267 | default_protocol = cfg.protocol = PROT_TELNET; |
268 | default_port = cfg.port = 23; |
269 | } else if (!strcmp(p, "-raw")) { |
270 | default_protocol = cfg.protocol = PROT_RAW; |
67779be7 |
271 | } else if (!strcmp(p, "-v")) { |
272 | flags |= FLAG_VERBOSE; |
12dc4ec0 |
273 | } else if (!strcmp(p, "-log")) { |
274 | logfile = "putty.log"; |
d8426c54 |
275 | } else if (!strcmp(p, "-pw") && argc > 1) { |
276 | --argc, password = *++argv; |
e7a7383f |
277 | } else if (!strcmp(p, "-l") && argc > 1) { |
278 | char *username; |
279 | --argc, username = *++argv; |
280 | strncpy(cfg.username, username, sizeof(cfg.username)); |
281 | cfg.username[sizeof(cfg.username)-1] = '\0'; |
d8426c54 |
282 | } else if (!strcmp(p, "-P") && argc > 1) { |
283 | --argc, portnumber = atoi(*++argv); |
284 | } |
12dc4ec0 |
285 | } else if (*p) { |
286 | if (!*cfg.host) { |
287 | char *q = p; |
288 | /* |
289 | * If the hostname starts with "telnet:", set the |
290 | * protocol to Telnet and process the string as a |
291 | * Telnet URL. |
292 | */ |
293 | if (!strncmp(q, "telnet:", 7)) { |
294 | char c; |
295 | |
296 | q += 7; |
297 | if (q[0] == '/' && q[1] == '/') |
298 | q += 2; |
299 | cfg.protocol = PROT_TELNET; |
300 | p = q; |
301 | while (*p && *p != ':' && *p != '/') p++; |
302 | c = *p; |
303 | if (*p) |
304 | *p++ = '\0'; |
305 | if (c == ':') |
306 | cfg.port = atoi(p); |
307 | else |
308 | cfg.port = -1; |
309 | strncpy (cfg.host, q, sizeof(cfg.host)-1); |
310 | cfg.host[sizeof(cfg.host)-1] = '\0'; |
311 | } else { |
9d33ebdd |
312 | char *r; |
313 | /* |
314 | * Before we process the [user@]host string, we |
315 | * first check for the presence of a protocol |
316 | * prefix (a protocol name followed by ","). |
317 | */ |
318 | r = strchr(p, ','); |
319 | if (r) { |
320 | int i, j; |
321 | for (i = 0; backends[i].backend != NULL; i++) { |
322 | j = strlen(backends[i].name); |
323 | if (j == r-p && |
324 | !memcmp(backends[i].name, p, j)) { |
325 | default_protocol = cfg.protocol = backends[i].protocol; |
326 | portnumber = backends[i].backend->default_port; |
327 | p = r+1; |
328 | break; |
329 | } |
330 | } |
331 | } |
332 | |
12dc4ec0 |
333 | /* |
334 | * Three cases. Either (a) there's a nonzero |
335 | * length string followed by an @, in which |
336 | * case that's user and the remainder is host. |
337 | * Or (b) there's only one string, not counting |
338 | * a potential initial @, and it exists in the |
339 | * saved-sessions database. Or (c) only one |
340 | * string and it _doesn't_ exist in the |
341 | * database. |
342 | */ |
9d33ebdd |
343 | r = strrchr(p, '@'); |
12dc4ec0 |
344 | if (r == p) p++, r = NULL; /* discount initial @ */ |
345 | if (r == NULL) { |
346 | /* |
347 | * One string. |
348 | */ |
a9422f39 |
349 | do_defaults (p, &cfg); |
12dc4ec0 |
350 | if (cfg.host[0] == '\0') { |
351 | /* No settings for this host; use defaults */ |
352 | strncpy(cfg.host, p, sizeof(cfg.host)-1); |
353 | cfg.host[sizeof(cfg.host)-1] = '\0'; |
354 | cfg.port = 22; |
355 | } |
356 | } else { |
357 | *r++ = '\0'; |
358 | strncpy(cfg.username, p, sizeof(cfg.username)-1); |
359 | cfg.username[sizeof(cfg.username)-1] = '\0'; |
360 | strncpy(cfg.host, r, sizeof(cfg.host)-1); |
361 | cfg.host[sizeof(cfg.host)-1] = '\0'; |
362 | cfg.port = 22; |
363 | } |
364 | } |
365 | } else { |
366 | int len = sizeof(cfg.remote_cmd) - 1; |
367 | char *cp = cfg.remote_cmd; |
368 | int len2; |
369 | |
370 | strncpy(cp, p, len); cp[len] = '\0'; |
371 | len2 = strlen(cp); len -= len2; cp += len2; |
372 | while (--argc) { |
373 | if (len > 0) |
374 | len--, *cp++ = ' '; |
375 | strncpy(cp, *++argv, len); cp[len] = '\0'; |
376 | len2 = strlen(cp); len -= len2; cp += len2; |
377 | } |
378 | cfg.nopty = TRUE; /* command => no terminal */ |
379 | cfg.ldisc_term = TRUE; /* use stdin like a line buffer */ |
380 | break; /* done with cmdline */ |
381 | } |
382 | } |
383 | } |
384 | |
d8426c54 |
385 | if (!*cfg.host) { |
386 | usage(); |
387 | } |
d8426c54 |
388 | |
67779be7 |
389 | if (!*cfg.remote_cmd) |
390 | flags |= FLAG_INTERACTIVE; |
391 | |
12dc4ec0 |
392 | /* |
393 | * Select protocol. This is farmed out into a table in a |
394 | * separate file to enable an ssh-free variant. |
395 | */ |
396 | { |
397 | int i; |
398 | back = NULL; |
399 | for (i = 0; backends[i].backend != NULL; i++) |
400 | if (backends[i].protocol == cfg.protocol) { |
401 | back = backends[i].backend; |
402 | break; |
403 | } |
404 | if (back == NULL) { |
405 | fprintf(stderr, "Internal fault: Unsupported protocol found\n"); |
406 | return 1; |
407 | } |
408 | } |
409 | |
410 | /* |
8cb9c947 |
411 | * Select port. |
412 | */ |
413 | if (portnumber != -1) |
414 | cfg.port = portnumber; |
415 | |
416 | /* |
12dc4ec0 |
417 | * Initialise WinSock. |
418 | */ |
419 | winsock_ver = MAKEWORD(2, 0); |
420 | if (WSAStartup(winsock_ver, &wsadata)) { |
421 | MessageBox(NULL, "Unable to initialise WinSock", "WinSock Error", |
422 | MB_OK | MB_ICONEXCLAMATION); |
423 | return 1; |
424 | } |
425 | if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wVersion) != 0) { |
426 | MessageBox(NULL, "WinSock version is incompatible with 2.0", |
427 | "WinSock Error", MB_OK | MB_ICONEXCLAMATION); |
428 | WSACleanup(); |
429 | return 1; |
430 | } |
431 | |
432 | /* |
433 | * Start up the connection. |
434 | */ |
435 | { |
436 | char *error; |
437 | char *realhost; |
438 | |
439 | error = back->init (NULL, cfg.host, cfg.port, &realhost); |
440 | if (error) { |
441 | fprintf(stderr, "Unable to open connection:\n%s", error); |
442 | return 1; |
443 | } |
444 | } |
445 | |
446 | netevent = CreateEvent(NULL, FALSE, FALSE, NULL); |
447 | stdinevent = CreateEvent(NULL, FALSE, FALSE, NULL); |
448 | |
6f34e365 |
449 | GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), &orig_console_mode); |
450 | SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), ENABLE_PROCESSED_INPUT); |
12dc4ec0 |
451 | outhandle = GetStdHandle(STD_OUTPUT_HANDLE); |
452 | |
453 | /* |
454 | * Now we must send the back end oodles of stuff. |
455 | */ |
456 | socket = back->socket(); |
457 | /* |
458 | * Turn off ECHO and LINE input modes. We don't care if this |
459 | * call fails, because we know we aren't necessarily running in |
460 | * a console. |
461 | */ |
462 | WSAEventSelect(socket, netevent, FD_READ | FD_CLOSE); |
463 | handles[0] = netevent; |
464 | handles[1] = stdinevent; |
465 | sending = FALSE; |
466 | while (1) { |
467 | int n; |
8cb9c947 |
468 | |
469 | if (!sending && back->sendok()) { |
470 | /* |
471 | * Create a separate thread to read from stdin. This is |
472 | * a total pain, but I can't find another way to do it: |
473 | * |
474 | * - an overlapped ReadFile or ReadFileEx just doesn't |
475 | * happen; we get failure from ReadFileEx, and |
476 | * ReadFile blocks despite being given an OVERLAPPED |
477 | * structure. Perhaps we can't do overlapped reads |
478 | * on consoles. WHY THE HELL NOT? |
479 | * |
480 | * - WaitForMultipleObjects(netevent, console) doesn't |
481 | * work, because it signals the console when |
482 | * _anything_ happens, including mouse motions and |
483 | * other things that don't cause data to be readable |
484 | * - so we're back to ReadFile blocking. |
485 | */ |
486 | idata.event = stdinevent; |
487 | if (!CreateThread(NULL, 0, stdin_read_thread, |
488 | &idata, 0, &threadid)) { |
489 | fprintf(stderr, "Unable to create second thread\n"); |
490 | exit(1); |
491 | } |
492 | sending = TRUE; |
493 | } |
494 | |
12dc4ec0 |
495 | n = WaitForMultipleObjects(2, handles, FALSE, INFINITE); |
496 | if (n == 0) { |
497 | WSANETWORKEVENTS things; |
498 | if (!WSAEnumNetworkEvents(socket, netevent, &things)) { |
499 | if (things.lNetworkEvents & FD_READ) |
500 | back->msg(0, FD_READ); |
501 | if (things.lNetworkEvents & FD_CLOSE) { |
502 | back->msg(0, FD_CLOSE); |
503 | break; |
504 | } |
505 | } |
506 | term_out(); |
12dc4ec0 |
507 | } else if (n == 1) { |
508 | if (idata.len > 0) { |
509 | back->send(idata.buffer, idata.len); |
510 | } else { |
511 | back->special(TS_EOF); |
512 | } |
513 | } |
514 | } |
515 | WSACleanup(); |
516 | return 0; |
517 | } |