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