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 #include <winsock2.h>
   6 #include <windows.h>
   7 #include <stdio.h>
   8 #include <stdarg.h>
   9
  10 #define PUTTY_DO_GLOBALS                       /* actually _define_ globals */
  11 #include "putty.h"
  12
  13 void fatalbox (char *p, ...) {
  14     va_list ap;
  15     fprintf(stderr, "FATAL ERROR: ", p);
  16     va_start(ap, p);
  17     vfprintf(stderr, p, ap);
  18     va_end(ap);
  19     fputc('\n', stderr);
  20     WSACleanup();
  21     exit(1);
  22 }
  23 void connection_fatal (char *p, ...) {
  24     va_list ap;
  25     fprintf(stderr, "FATAL ERROR: ", p);
  26     va_start(ap, p);
  27     vfprintf(stderr, p, ap);
  28     va_end(ap);
  29     fputc('\n', stderr);
  30     WSACleanup();
  31     exit(1);
  32 }
  33
  34 HANDLE outhandle;
  35 DWORD orig_console_mode;
  36
  37 void begin_session(void) {
  38     if (!cfg.ldisc_term)
  39         SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), ENABLE_PROCESSED_INPUT);
  40     else
  41         SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), orig_console_mode);
  42 }
  43
  44 void term_out(void)
  45 {
  46     int reap;
  47     DWORD ret;
  48     reap = 0;
  49     while (reap < inbuf_head) {
  50         if (!WriteFile(outhandle, inbuf+reap, inbuf_head-reap, &ret, NULL))
  51             return;                    /* give up in panic */
  52         reap += ret;
  53     }
  54     inbuf_head = 0;
  55 }
  56
  57 struct input_data {
  58     DWORD len;
  59     char buffer[4096];
  60     HANDLE event;
  61 };
  62
  63 static int get_password(const char *prompt, char *str, int maxlen)
  64 {
  65     HANDLE hin, hout;
  66     DWORD savemode, i;
  67
  68 #if 0 /* this allows specifying a password some other way */
  69     if (password) {
  70         static int tried_once = 0;
  71
  72         if (tried_once) {
  73             return 0;
  74         } else {
  75             strncpy(str, password, maxlen);
  76             str[maxlen-1] = '\0';
  77             tried_once = 1;
  78             return 1;
  79         }
  80     }
  81 #endif
  82
  83     hin = GetStdHandle(STD_INPUT_HANDLE);
  84     hout = GetStdHandle(STD_OUTPUT_HANDLE);
  85     if (hin == INVALID_HANDLE_VALUE || hout == INVALID_HANDLE_VALUE) {
  86         fprintf(stderr, "Cannot get standard input/output handles");
  87         return 0;
  88     }
  89
  90     GetConsoleMode(hin, &savemode);
  91     SetConsoleMode(hin, (savemode & (~ENABLE_ECHO_INPUT)) |
  92                    ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT);
  93
  94     WriteFile(hout, prompt, strlen(prompt), &i, NULL);
  95     ReadFile(hin, str, maxlen-1, &i, NULL);
  96
  97     SetConsoleMode(hin, savemode);
  98
  99     if ((int)i > maxlen) i = maxlen-1; else i = i - 2;
 100     str[i] = '\0';
 101
 102     WriteFile(hout, "\r\n", 2, &i, NULL);
 103
 104     return 1;
 105 }
 106
 107 int WINAPI stdin_read_thread(void *param) {
 108     struct input_data *idata = (struct input_data *)param;
 109     HANDLE inhandle;
 110
 111     inhandle = GetStdHandle(STD_INPUT_HANDLE);
 112
 113     while (ReadFile(inhandle, idata->buffer, sizeof(idata->buffer),
 114                     &idata->len, NULL)) {
 115         SetEvent(idata->event);
 116     }
 117
 118     idata->len = 0;
 119     SetEvent(idata->event);
 120
 121     return 0;
 122 }
 123
 124 int main(int argc, char **argv) {
 125     WSADATA wsadata;
 126     WORD winsock_ver;
 127     WSAEVENT netevent, stdinevent;
 128     HANDLE handles[2];
 129     SOCKET socket;
 130     DWORD threadid;
 131     struct input_data idata;
 132     int sending;
 133
 134     ssh_get_password = get_password;
 135
 136     flags = FLAG_STDERR;
 137     /*
 138      * Process the command line.
 139      */
 140     default_protocol = DEFAULT_PROTOCOL;
 141     default_port = DEFAULT_PORT;
 142     do_defaults(NULL);
 143     while (--argc) {
 144         char *p = *++argv;
 145         if (*p == '-') {
 146             if (!strcmp(p, "-ssh")) {
 147                 default_protocol = cfg.protocol = PROT_SSH;
 148                 default_port = cfg.port = 22;
 149             } else if (!strcmp(p, "-v")) {
 150                 flags |= FLAG_VERBOSE;
 151             } else if (!strcmp(p, "-log")) {
 152                 logfile = "putty.log";
 153             }
 154         } else if (*p) {
 155             if (!*cfg.host) {
 156                 char *q = p;
 157                 /*
 158                  * If the hostname starts with "telnet:", set the
 159                  * protocol to Telnet and process the string as a
 160                  * Telnet URL.
 161                  */
 162                 if (!strncmp(q, "telnet:", 7)) {
 163                     char c;
 164
 165                     q += 7;
 166                     if (q[0] == '/' && q[1] == '/')
 167                         q += 2;
 168                     cfg.protocol = PROT_TELNET;
 169                     p = q;
 170                     while (*p && *p != ':' && *p != '/') p++;
 171                     c = *p;
 172                     if (*p)
 173                         *p++ = '\0';
 174                     if (c == ':')
 175                         cfg.port = atoi(p);
 176                     else
 177                         cfg.port = -1;
 178                     strncpy (cfg.host, q, sizeof(cfg.host)-1);
 179                     cfg.host[sizeof(cfg.host)-1] = '\0';
 180                 } else {
 181                     /*
 182                      * Three cases. Either (a) there's a nonzero
 183                      * length string followed by an @, in which
 184                      * case that's user and the remainder is host.
 185                      * Or (b) there's only one string, not counting
 186                      * a potential initial @, and it exists in the
 187                      * saved-sessions database. Or (c) only one
 188                      * string and it _doesn't_ exist in the
 189                      * database.
 190                      */
 191                     char *r = strrchr(p, '@');
 192                     if (r == p) p++, r = NULL;   /* discount initial @ */
 193                     if (r == NULL) {
 194                         /*
 195                          * One string.
 196                          */
 197                         do_defaults (p);
 198                         if (cfg.host[0] == '\0') {
 199                             /* No settings for this host; use defaults */
 200                             strncpy(cfg.host, p, sizeof(cfg.host)-1);
 201                             cfg.host[sizeof(cfg.host)-1] = '\0';
 202                             cfg.port = 22;
 203                         }
 204                     } else {
 205                         *r++ = '\0';
 206                         strncpy(cfg.username, p, sizeof(cfg.username)-1);
 207                         cfg.username[sizeof(cfg.username)-1] = '\0';
 208                         strncpy(cfg.host, r, sizeof(cfg.host)-1);
 209                         cfg.host[sizeof(cfg.host)-1] = '\0';
 210                         cfg.port = 22;
 211                     }
 212                 }
 213             } else {
 214                 int len = sizeof(cfg.remote_cmd) - 1;
 215                 char *cp = cfg.remote_cmd;
 216                 int len2;
 217
 218                 strncpy(cp, p, len); cp[len] = '\0';
 219                 len2 = strlen(cp); len -= len2; cp += len2;
 220                 while (--argc) {
 221                     if (len > 0)
 222                         len--, *cp++ = ' ';
 223                     strncpy(cp, *++argv, len); cp[len] = '\0';
 224                     len2 = strlen(cp); len -= len2; cp += len2;
 225                 }
 226                 cfg.nopty = TRUE;      /* command => no terminal */
 227                 cfg.ldisc_term = TRUE; /* use stdin like a line buffer */
 228                 break;                 /* done with cmdline */
 229             }
 230         }
 231     }
 232
 233     if (!*cfg.remote_cmd)
 234         flags |= FLAG_INTERACTIVE;
 235
 236     /*
 237      * Select protocol. This is farmed out into a table in a
 238      * separate file to enable an ssh-free variant.
 239      */
 240     {
 241         int i;
 242         back = NULL;
 243         for (i = 0; backends[i].backend != NULL; i++)
 244             if (backends[i].protocol == cfg.protocol) {
 245                 back = backends[i].backend;
 246                 break;
 247             }
 248         if (back == NULL) {
 249             fprintf(stderr, "Internal fault: Unsupported protocol found\n");
 250             return 1;
 251         }
 252     }
 253
 254     /*
 255      * Initialise WinSock.
 256      */
 257     winsock_ver = MAKEWORD(2, 0);
 258     if (WSAStartup(winsock_ver, &wsadata)) {
 259         MessageBox(NULL, "Unable to initialise WinSock", "WinSock Error",
 260                    MB_OK | MB_ICONEXCLAMATION);
 261         return 1;
 262     }
 263     if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wVersion) != 0) {
 264         MessageBox(NULL, "WinSock version is incompatible with 2.0",
 265                    "WinSock Error", MB_OK | MB_ICONEXCLAMATION);
 266         WSACleanup();
 267         return 1;
 268     }
 269
 270     /*
 271      * Start up the connection.
 272      */
 273     {
 274         char *error;
 275         char *realhost;
 276
 277         error = back->init (NULL, cfg.host, cfg.port, &realhost);
 278         if (error) {
 279             fprintf(stderr, "Unable to open connection:\n%s", error);
 280             return 1;
 281         }
 282     }
 283
 284     netevent = CreateEvent(NULL, FALSE, FALSE, NULL);
 285     stdinevent = CreateEvent(NULL, FALSE, FALSE, NULL);
 286
 287     GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), &orig_console_mode);
 288     SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), ENABLE_PROCESSED_INPUT);
 289     outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
 290
 291     /*
 292      * Now we must send the back end oodles of stuff.
 293      */
 294     socket = back->socket();
 295     /*
 296      * Turn off ECHO and LINE input modes. We don't care if this
 297      * call fails, because we know we aren't necessarily running in
 298      * a console.
 299      */
 300     WSAEventSelect(socket, netevent, FD_READ | FD_CLOSE);
 301     handles[0] = netevent;
 302     handles[1] = stdinevent;
 303     sending = FALSE;
 304     while (1) {
 305         int n;
 306         n = WaitForMultipleObjects(2, handles, FALSE, INFINITE);
 307         if (n == 0) {
 308             WSANETWORKEVENTS things;
 309             if (!WSAEnumNetworkEvents(socket, netevent, &things)) {
 310                 if (things.lNetworkEvents & FD_READ)
 311                     back->msg(0, FD_READ);
 312                 if (things.lNetworkEvents & FD_CLOSE) {
 313                     back->msg(0, FD_CLOSE);
 314                     break;
 315                 }
 316             }
 317             term_out();
 318             if (!sending && back->sendok()) {
 319                 /*
 320                  * Create a separate thread to read from stdin.
 321                  * This is a total pain, but I can't find another
 322                  * way to do it:
 323                  *
 324                  *  - an overlapped ReadFile or ReadFileEx just
 325                  *    doesn't happen; we get failure from
 326                  *    ReadFileEx, and ReadFile blocks despite being
 327                  *    given an OVERLAPPED structure. Perhaps we
 328                  *    can't do overlapped reads on consoles. WHY
 329                  *    THE HELL NOT?
 330                  *
 331                  *  - WaitForMultipleObjects(netevent, console)
 332                  *    doesn't work, because it signals the console
 333                  *    when _anything_ happens, including mouse
 334                  *    motions and other things that don't cause
 335                  *    data to be readable - so we're back to
 336                  *    ReadFile blocking.
 337                  */
 338                 idata.event = stdinevent;
 339                 if (!CreateThread(NULL, 0, stdin_read_thread,
 340                                   &idata, 0, &threadid)) {
 341                     fprintf(stderr, "Unable to create second thread\n");
 342                     exit(1);
 343                 }
 344                 sending = TRUE;
 345             }
 346         } else if (n == 1) {
 347             if (idata.len > 0) {
 348                 back->send(idata.buffer, idata.len);
 349             } else {
 350                 back->special(TS_EOF);
 351             }
 352         }
 353     }
 354     WSACleanup();
 355     return 0;
 356 }