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