git.distorted.org.uk Git - u/mdw/putty/blob - plink.c

   1 /*
   2  * PLink - a command-line (stdin/stdout) variant of PuTTY.
   3  */
   4
   5 #ifndef AUTO_WINSOCK
   6 #include <winsock2.h>
   7 #endif
   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"
  14
  15 void fatalbox (char *p, ...) {
  16     va_list ap;
  17     fprintf(stderr, "FATAL ERROR: ", p);
  18     va_start(ap, p);
  19     vfprintf(stderr, p, ap);
  20     va_end(ap);
  21     fputc('\n', stderr);
  22     WSACleanup();
  23     exit(1);
  24 }
  25 void connection_fatal (char *p, ...) {
  26     va_list ap;
  27     fprintf(stderr, "FATAL ERROR: ", p);
  28     va_start(ap, p);
  29     vfprintf(stderr, p, ap);
  30     va_end(ap);
  31     fputc('\n', stderr);
  32     WSACleanup();
  33     exit(1);
  34 }
  35
  36 static char *password = NULL;
  37
  38 /*
  39  * Stubs for linking with other modules.
  40  */
  41 void write_clip (void *data, int len) { }
  42 void term_deselect(void) { }
  43
  44 HANDLE outhandle;
  45 DWORD orig_console_mode;
  46
  47 void begin_session(void) {
  48     if (!cfg.ldisc_term)
  49         SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), ENABLE_PROCESSED_INPUT);
  50     else
  51         SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), orig_console_mode);
  52 }
  53
  54 void term_out(void)
  55 {
  56     int reap;
  57     DWORD ret;
  58     reap = 0;
  59     while (reap < inbuf_head) {
  60         if (!WriteFile(outhandle, inbuf+reap, inbuf_head-reap, &ret, NULL))
  61             return;                    /* give up in panic */
  62         reap += ret;
  63     }
  64     inbuf_head = 0;
  65 }
  66
  67 struct input_data {
  68     DWORD len;
  69     char buffer[4096];
  70     HANDLE event;
  71 };
  72
  73 static int get_password(const char *prompt, char *str, int maxlen)
  74 {
  75     HANDLE hin, hout;
  76     DWORD savemode, i;
  77
  78     if (password) {
  79         static int tried_once = 0;
  80
  81         if (tried_once) {
  82             return 0;
  83         } else {
  84             strncpy(str, password, maxlen);
  85             str[maxlen-1] = '\0';
  86             tried_once = 1;
  87             return 1;
  88         }
  89     }
  90
  91     hin = GetStdHandle(STD_INPUT_HANDLE);
  92     hout = GetStdHandle(STD_OUTPUT_HANDLE);
  93     if (hin == INVALID_HANDLE_VALUE || hout == INVALID_HANDLE_VALUE) {
  94         fprintf(stderr, "Cannot get standard input/output handles");
  95         return 0;
  96     }
  97
  98     GetConsoleMode(hin, &savemode);
  99     SetConsoleMode(hin, (savemode & (~ENABLE_ECHO_INPUT)) |
 100                    ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT);
 101
 102     WriteFile(hout, prompt, strlen(prompt), &i, NULL);
 103     ReadFile(hin, str, maxlen-1, &i, NULL);
 104
 105     SetConsoleMode(hin, savemode);
 106
 107     if ((int)i > maxlen) i = maxlen-1; else i = i - 2;
 108     str[i] = '\0';
 109
 110     WriteFile(hout, "\r\n", 2, &i, NULL);
 111
 112     return 1;
 113 }
 114
 115 int WINAPI stdin_read_thread(void *param) {
 116     struct input_data *idata = (struct input_data *)param;
 117     HANDLE inhandle;
 118
 119     inhandle = GetStdHandle(STD_INPUT_HANDLE);
 120
 121     while (ReadFile(inhandle, idata->buffer, sizeof(idata->buffer),
 122                     &idata->len, NULL)) {
 123         SetEvent(idata->event);
 124     }
 125
 126     idata->len = 0;
 127     SetEvent(idata->event);
 128
 129     return 0;
 130 }
 131
 132 /*
 133  *  Short description of parameters.
 134  */
 135 static void usage(void)
 136 {
 137     printf("PuTTY Link: command-line connection utility\n");
 138     printf("%s\n", ver);
 139     printf("Usage: plink [options] [user@]host [command]\n");
 140     printf("Options:\n");
 141     printf("  -v        show verbose messages\n");
 142     printf("  -ssh      force use of ssh protocol\n");
 143     printf("  -P port   connect to specified port\n");
 144     printf("  -pw passw login with specified password\n");
 145     exit(1);
 146 }
 147
 148 int main(int argc, char **argv) {
 149     WSADATA wsadata;
 150     WORD winsock_ver;
 151     WSAEVENT netevent, stdinevent;
 152     HANDLE handles[2];
 153     SOCKET socket;
 154     DWORD threadid;
 155     struct input_data idata;
 156     int sending;
 157     int portnumber = -1;
 158
 159     ssh_get_password = get_password;
 160
 161     flags = FLAG_STDERR;
 162     /*
 163      * Process the command line.
 164      */
 165     default_protocol = DEFAULT_PROTOCOL;
 166     default_port = DEFAULT_PORT;
 167     do_defaults(NULL);
 168     while (--argc) {
 169         char *p = *++argv;
 170         if (*p == '-') {
 171             if (!strcmp(p, "-ssh")) {
 172                 default_protocol = cfg.protocol = PROT_SSH;
 173                 default_port = cfg.port = 22;
 174             } else if (!strcmp(p, "-v")) {
 175                 flags |= FLAG_VERBOSE;
 176             } else if (!strcmp(p, "-log")) {
 177                 logfile = "putty.log";
 178             } else if (!strcmp(p, "-pw") && argc > 1) {
 179                 --argc, password = *++argv;
 180                 printf("pw is %s\n", password);
 181             } else if (!strcmp(p, "-P") && argc > 1) {
 182                 --argc, portnumber = atoi(*++argv);
 183             }
 184         } else if (*p) {
 185             if (!*cfg.host) {
 186                 char *q = p;
 187                 /*
 188                  * If the hostname starts with "telnet:", set the
 189                  * protocol to Telnet and process the string as a
 190                  * Telnet URL.
 191                  */
 192                 if (!strncmp(q, "telnet:", 7)) {
 193                     char c;
 194
 195                     q += 7;
 196                     if (q[0] == '/' && q[1] == '/')
 197                         q += 2;
 198                     cfg.protocol = PROT_TELNET;
 199                     p = q;
 200                     while (*p && *p != ':' && *p != '/') p++;
 201                     c = *p;
 202                     if (*p)
 203                         *p++ = '\0';
 204                     if (c == ':')
 205                         cfg.port = atoi(p);
 206                     else
 207                         cfg.port = -1;
 208                     strncpy (cfg.host, q, sizeof(cfg.host)-1);
 209                     cfg.host[sizeof(cfg.host)-1] = '\0';
 210                 } else {
 211                     /*
 212                      * Three cases. Either (a) there's a nonzero
 213                      * length string followed by an @, in which
 214                      * case that's user and the remainder is host.
 215                      * Or (b) there's only one string, not counting
 216                      * a potential initial @, and it exists in the
 217                      * saved-sessions database. Or (c) only one
 218                      * string and it _doesn't_ exist in the
 219                      * database.
 220                      */
 221                     char *r = strrchr(p, '@');
 222                     if (r == p) p++, r = NULL;   /* discount initial @ */
 223                     if (r == NULL) {
 224                         /*
 225                          * One string.
 226                          */
 227                         do_defaults (p);
 228                         if (cfg.host[0] == '\0') {
 229                             /* No settings for this host; use defaults */
 230                             strncpy(cfg.host, p, sizeof(cfg.host)-1);
 231                             cfg.host[sizeof(cfg.host)-1] = '\0';
 232                             cfg.port = 22;
 233                         }
 234                     } else {
 235                         *r++ = '\0';
 236                         strncpy(cfg.username, p, sizeof(cfg.username)-1);
 237                         cfg.username[sizeof(cfg.username)-1] = '\0';
 238                         strncpy(cfg.host, r, sizeof(cfg.host)-1);
 239                         cfg.host[sizeof(cfg.host)-1] = '\0';
 240                         cfg.port = 22;
 241                     }
 242                 }
 243             } else {
 244                 int len = sizeof(cfg.remote_cmd) - 1;
 245                 char *cp = cfg.remote_cmd;
 246                 int len2;
 247
 248                 strncpy(cp, p, len); cp[len] = '\0';
 249                 len2 = strlen(cp); len -= len2; cp += len2;
 250                 while (--argc) {
 251                     if (len > 0)
 252                         len--, *cp++ = ' ';
 253                     strncpy(cp, *++argv, len); cp[len] = '\0';
 254                     len2 = strlen(cp); len -= len2; cp += len2;
 255                 }
 256                 cfg.nopty = TRUE;      /* command => no terminal */
 257                 cfg.ldisc_term = TRUE; /* use stdin like a line buffer */
 258                 break;                 /* done with cmdline */
 259             }
 260         }
 261     }
 262
 263     if (!*cfg.host) {
 264         usage();
 265     }
 266     if (portnumber != -1)
 267         cfg.port = portnumber;
 268
 269     if (!*cfg.remote_cmd)
 270         flags |= FLAG_INTERACTIVE;
 271
 272     /*
 273      * Select protocol. This is farmed out into a table in a
 274      * separate file to enable an ssh-free variant.
 275      */
 276     {
 277         int i;
 278         back = NULL;
 279         for (i = 0; backends[i].backend != NULL; i++)
 280             if (backends[i].protocol == cfg.protocol) {
 281                 back = backends[i].backend;
 282                 break;
 283             }
 284         if (back == NULL) {
 285             fprintf(stderr, "Internal fault: Unsupported protocol found\n");
 286             return 1;
 287         }
 288     }
 289
 290     /*
 291      * Initialise WinSock.
 292      */
 293     winsock_ver = MAKEWORD(2, 0);
 294     if (WSAStartup(winsock_ver, &wsadata)) {
 295         MessageBox(NULL, "Unable to initialise WinSock", "WinSock Error",
 296                    MB_OK | MB_ICONEXCLAMATION);
 297         return 1;
 298     }
 299     if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wVersion) != 0) {
 300         MessageBox(NULL, "WinSock version is incompatible with 2.0",
 301                    "WinSock Error", MB_OK | MB_ICONEXCLAMATION);
 302         WSACleanup();
 303         return 1;
 304     }
 305
 306     /*
 307      * Start up the connection.
 308      */
 309     {
 310         char *error;
 311         char *realhost;
 312
 313         error = back->init (NULL, cfg.host, cfg.port, &realhost);
 314         if (error) {
 315             fprintf(stderr, "Unable to open connection:\n%s", error);
 316             return 1;
 317         }
 318     }
 319
 320     netevent = CreateEvent(NULL, FALSE, FALSE, NULL);
 321     stdinevent = CreateEvent(NULL, FALSE, FALSE, NULL);
 322
 323     GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), &orig_console_mode);
 324     SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), ENABLE_PROCESSED_INPUT);
 325     outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
 326
 327     /*
 328      * Now we must send the back end oodles of stuff.
 329      */
 330     socket = back->socket();
 331     /*
 332      * Turn off ECHO and LINE input modes. We don't care if this
 333      * call fails, because we know we aren't necessarily running in
 334      * a console.
 335      */
 336     WSAEventSelect(socket, netevent, FD_READ | FD_CLOSE);
 337     handles[0] = netevent;
 338     handles[1] = stdinevent;
 339     sending = FALSE;
 340     while (1) {
 341         int n;
 342         n = WaitForMultipleObjects(2, handles, FALSE, INFINITE);
 343         if (n == 0) {
 344             WSANETWORKEVENTS things;
 345             if (!WSAEnumNetworkEvents(socket, netevent, &things)) {
 346                 if (things.lNetworkEvents & FD_READ)
 347                     back->msg(0, FD_READ);
 348                 if (things.lNetworkEvents & FD_CLOSE) {
 349                     back->msg(0, FD_CLOSE);
 350                     break;
 351                 }
 352             }
 353             term_out();
 354             if (!sending && back->sendok()) {
 355                 /*
 356                  * Create a separate thread to read from stdin.
 357                  * This is a total pain, but I can't find another
 358                  * way to do it:
 359                  *
 360                  *  - an overlapped ReadFile or ReadFileEx just
 361                  *    doesn't happen; we get failure from
 362                  *    ReadFileEx, and ReadFile blocks despite being
 363                  *    given an OVERLAPPED structure. Perhaps we
 364                  *    can't do overlapped reads on consoles. WHY
 365                  *    THE HELL NOT?
 366                  *
 367                  *  - WaitForMultipleObjects(netevent, console)
 368                  *    doesn't work, because it signals the console
 369                  *    when _anything_ happens, including mouse
 370                  *    motions and other things that don't cause
 371                  *    data to be readable - so we're back to
 372                  *    ReadFile blocking.
 373                  */
 374                 idata.event = stdinevent;
 375                 if (!CreateThread(NULL, 0, stdin_read_thread,
 376                                   &idata, 0, &threadid)) {
 377                     fprintf(stderr, "Unable to create second thread\n");
 378                     exit(1);
 379                 }
 380                 sending = TRUE;
 381             }
 382         } else if (n == 1) {
 383             if (idata.len > 0) {
 384                 back->send(idata.buffer, idata.len);
 385             } else {
 386                 back->special(TS_EOF);
 387             }
 388         }
 389     }
 390     WSACleanup();
 391     return 0;
 392 }