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

   1 /*
   2  * cmdline.c - command-line parsing shared between many of the
   3  * PuTTY applications
   4  */
   5
   6 #include <stdio.h>
   7 #include <assert.h>
   8 #include <stdlib.h>
   9 #include "putty.h"
  10
  11 /*
  12  * Some command-line parameters need to be saved up until after
  13  * we've loaded the saved session which will form the basis of our
  14  * eventual running configuration. For this we use the macro
  15  * SAVEABLE, which notices if the `need_save' parameter is set and
  16  * saves the parameter and value on a list.
  17  *
  18  * We also assign priorities to saved parameters, just to slightly
  19  * ameliorate silly ordering problems. For example, if you specify
  20  * a saved session to load, it will be loaded _before_ all your
  21  * local modifications such as -L are evaluated; and if you specify
  22  * a protocol and a port, the protocol is set up first so that the
  23  * port can override its choice of port number.
  24  *
  25  * (In fact -load is not saved at all, since in at least Plink the
  26  * processing of further command-line options depends on whether or
  27  * not the loaded session contained a hostname. So it must be
  28  * executed immediately.)
  29  */
  30
  31 #define NPRIORITIES 2
  32
  33 struct cmdline_saved_param {
  34     char *p, *value;
  35 };
  36 struct cmdline_saved_param_set {
  37     struct cmdline_saved_param *params;
  38     int nsaved, savesize;
  39 };
  40
  41 /*
  42  * C guarantees this structure will be initialised to all zero at
  43  * program start, which is exactly what we want.
  44  */
  45 static struct cmdline_saved_param_set saves[NPRIORITIES];
  46
  47 static void cmdline_save_param(char *p, char *value, int pri)
  48 {
  49     if (saves[pri].nsaved >= saves[pri].savesize) {
  50         saves[pri].savesize = saves[pri].nsaved + 32;
  51         saves[pri].params = sresize(saves[pri].params, saves[pri].savesize,
  52                                     struct cmdline_saved_param);
  53     }
  54     saves[pri].params[saves[pri].nsaved].p = p;
  55     saves[pri].params[saves[pri].nsaved].value = value;
  56     saves[pri].nsaved++;
  57 }
  58
  59 static char *cmdline_password = NULL;
  60
  61 void cmdline_cleanup(void)
  62 {
  63     int pri;
  64
  65     if (cmdline_password) {
  66         memset(cmdline_password, 0, strlen(cmdline_password));
  67         sfree(cmdline_password);
  68         cmdline_password = NULL;
  69     }
  70
  71     for (pri = 0; pri < NPRIORITIES; pri++) {
  72         sfree(saves[pri].params);
  73         saves[pri].params = NULL;
  74         saves[pri].savesize = 0;
  75         saves[pri].nsaved = 0;
  76     }
  77 }
  78
  79 #define SAVEABLE(pri) do { \
  80     if (need_save) { cmdline_save_param(p, value, pri); return ret; } \
  81 } while (0)
  82
  83 /*
  84  * Similar interface to get_userpass_input(), except that here a -1
  85  * return means that we aren't capable of processing the prompt and
  86  * someone else should do it.
  87  */
  88 int cmdline_get_passwd_input(prompts_t *p, unsigned char *in, int inlen) {
  89
  90     static int tried_once = 0;
  91
  92     /*
  93      * We only handle prompts which don't echo (which we assume to be
  94      * passwords), and (currently) we only cope with a password prompt
  95      * that comes in a prompt-set on its own.
  96      */
  97     if (!cmdline_password || in || p->n_prompts != 1 || p->prompts[0]->echo) {
  98         return -1;
  99     }
 100
 101     /*
 102      * If we've tried once, return utter failure (no more passwords left
 103      * to try).
 104      */
 105     if (tried_once)
 106         return 0;
 107
 108     strncpy(p->prompts[0]->result, cmdline_password,
 109             p->prompts[0]->result_len);
 110     p->prompts[0]->result[p->prompts[0]->result_len-1] = '\0';
 111     memset(cmdline_password, 0, strlen(cmdline_password));
 112     sfree(cmdline_password);
 113     cmdline_password = NULL;
 114     tried_once = 1;
 115     return 1;
 116
 117 }
 118
 119 /*
 120  * Here we have a flags word which describes the capabilities of
 121  * the particular tool on whose behalf we're running. We will
 122  * refuse certain command-line options if a particular tool
 123  * inherently can't do anything sensible. For example, the file
 124  * transfer tools (psftp, pscp) can't do a great deal with protocol
 125  * selections (ever tried running scp over telnet?) or with port
 126  * forwarding (even if it wasn't a hideously bad idea, they don't
 127  * have the select() infrastructure to make them work).
 128  */
 129 int cmdline_tooltype = 0;
 130
 131 static int cmdline_check_unavailable(int flag, char *p)
 132 {
 133     if (cmdline_tooltype & flag) {
 134         cmdline_error("option \"%s\" not available in this tool", p);
 135         return 1;
 136     }
 137     return 0;
 138 }
 139
 140 #define UNAVAILABLE_IN(flag) do { \
 141     if (cmdline_check_unavailable(flag, p)) return ret; \
 142 } while (0)
 143
 144 /*
 145  * Process a standard command-line parameter. `p' is the parameter
 146  * in question; `value' is the subsequent element of argv, which
 147  * may or may not be required as an operand to the parameter.
 148  * If `need_save' is 1, arguments which need to be saved as
 149  * described at this top of this file are, for later execution;
 150  * if 0, they are processed normally. (-1 is a special value used
 151  * by pterm to count arguments for a preliminary pass through the
 152  * argument list; it causes immediate return with an appropriate
 153  * value with no action taken.)
 154  * Return value is 2 if both arguments were used; 1 if only p was
 155  * used; 0 if the parameter wasn't one we recognised; -2 if it
 156  * should have been 2 but value was NULL.
 157  */
 158
 159 #define RETURN(x) do { \
 160     if ((x) == 2 && !value) return -2; \
 161     ret = x; \
 162     if (need_save < 0) return x; \
 163 } while (0)
 164
 165 int cmdline_process_param(char *p, char *value, int need_save, Config *cfg)
 166 {
 167     int ret = 0;
 168
 169     if (!strcmp(p, "-load")) {
 170         RETURN(2);
 171         /* This parameter must be processed immediately rather than being
 172          * saved. */
 173         do_defaults(value, cfg);
 174         loaded_session = TRUE;
 175         return 2;
 176     }
 177     if (!strcmp(p, "-ssh")) {
 178         RETURN(1);
 179         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 180         SAVEABLE(0);
 181         default_protocol = cfg->protocol = PROT_SSH;
 182         default_port = cfg->port = 22;
 183         return 1;
 184     }
 185     if (!strcmp(p, "-telnet")) {
 186         RETURN(1);
 187         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 188         SAVEABLE(0);
 189         default_protocol = cfg->protocol = PROT_TELNET;
 190         default_port = cfg->port = 23;
 191         return 1;
 192     }
 193     if (!strcmp(p, "-rlogin")) {
 194         RETURN(1);
 195         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 196         SAVEABLE(0);
 197         default_protocol = cfg->protocol = PROT_RLOGIN;
 198         default_port = cfg->port = 513;
 199         return 1;
 200     }
 201     if (!strcmp(p, "-raw")) {
 202         RETURN(1);
 203         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 204         SAVEABLE(0);
 205         default_protocol = cfg->protocol = PROT_RAW;
 206     }
 207     if (!strcmp(p, "-serial")) {
 208         RETURN(1);
 209         /* Serial is not NONNETWORK in an odd sense of the word */
 210         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 211         SAVEABLE(0);
 212         default_protocol = cfg->protocol = PROT_SERIAL;
 213         /* The host parameter will already be loaded into cfg->host, so copy it across */
 214         strncpy(cfg->serline, cfg->host, sizeof(cfg->serline) - 1);
 215         cfg->serline[sizeof(cfg->serline) - 1] = '\0';
 216     }
 217     if (!strcmp(p, "-v")) {
 218         RETURN(1);
 219         flags |= FLAG_VERBOSE;
 220     }
 221     if (!strcmp(p, "-l")) {
 222         RETURN(2);
 223         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 224         SAVEABLE(0);
 225         strncpy(cfg->username, value, sizeof(cfg->username));
 226         cfg->username[sizeof(cfg->username) - 1] = '\0';
 227     }
 228     if (!strcmp(p, "-loghost")) {
 229         RETURN(2);
 230         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 231         SAVEABLE(0);
 232         strncpy(cfg->loghost, value, sizeof(cfg->loghost));
 233         cfg->loghost[sizeof(cfg->loghost) - 1] = '\0';
 234     }
 235     if ((!strcmp(p, "-L") || !strcmp(p, "-R") || !strcmp(p, "-D"))) {
 236         char *fwd, *ptr, *q, *qq;
 237         int dynamic, i=0;
 238         RETURN(2);
 239         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 240         SAVEABLE(0);
 241         dynamic = !strcmp(p, "-D");
 242         fwd = value;
 243         ptr = cfg->portfwd;
 244         /* if existing forwards, find end of list */
 245         while (*ptr) {
 246             while (*ptr)
 247                 ptr++;
 248             ptr++;
 249         }
 250         i = ptr - cfg->portfwd;
 251         ptr[0] = p[1];  /* insert a 'L', 'R' or 'D' at the start */
 252         ptr++;
 253         if (1 + strlen(fwd) + 2 > sizeof(cfg->portfwd) - i) {
 254             cmdline_error("out of space for port forwardings");
 255             return ret;
 256         }
 257         strncpy(ptr, fwd, sizeof(cfg->portfwd) - i - 2);
 258         if (!dynamic) {
 259             /*
 260              * We expect _at least_ two colons in this string. The
 261              * possible formats are `sourceport:desthost:destport',
 262              * or `sourceip:sourceport:desthost:destport' if you're
 263              * specifying a particular loopback address. We need to
 264              * replace the one between source and dest with a \t;
 265              * this means we must find the second-to-last colon in
 266              * the string.
 267              */
 268             q = qq = strchr(ptr, ':');
 269             while (qq) {
 270                 char *qqq = strchr(qq+1, ':');
 271                 if (qqq)
 272                     q = qq;
 273                 qq = qqq;
 274             }
 275             if (q) *q = '\t';          /* replace second-last colon with \t */
 276         }
 277         cfg->portfwd[sizeof(cfg->portfwd) - 1] = '\0';
 278         cfg->portfwd[sizeof(cfg->portfwd) - 2] = '\0';
 279         ptr[strlen(ptr)+1] = '\000';    /* append 2nd '\000' */
 280     }
 281     if ((!strcmp(p, "-nc"))) {
 282         char *host, *portp;
 283
 284         RETURN(2);
 285         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 286         SAVEABLE(0);
 287
 288         host = portp = value;
 289         while (*portp && *portp != ':')
 290             portp++;
 291         if (*portp) {
 292             unsigned len = portp - host;
 293             if (len >= sizeof(cfg->ssh_nc_host))
 294                 len = sizeof(cfg->ssh_nc_host) - 1;
 295             memcpy(cfg->ssh_nc_host, value, len);
 296             cfg->ssh_nc_host[len] = '\0';
 297             cfg->ssh_nc_port = atoi(portp+1);
 298         } else {
 299             cmdline_error("-nc expects argument of form 'host:port'");
 300             return ret;
 301         }
 302     }
 303     if (!strcmp(p, "-m")) {
 304         char *filename, *command;
 305         int cmdlen, cmdsize;
 306         FILE *fp;
 307         int c, d;
 308
 309         RETURN(2);
 310         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 311         SAVEABLE(0);
 312
 313         filename = value;
 314
 315         cmdlen = cmdsize = 0;
 316         command = NULL;
 317         fp = fopen(filename, "r");
 318         if (!fp) {
 319             cmdline_error("unable to open command "
 320                           "file \"%s\"", filename);
 321             return ret;
 322         }
 323         do {
 324             c = fgetc(fp);
 325             d = c;
 326             if (c == EOF)
 327                 d = 0;
 328             if (cmdlen >= cmdsize) {
 329                 cmdsize = cmdlen + 512;
 330                 command = sresize(command, cmdsize, char);
 331             }
 332             command[cmdlen++] = d;
 333         } while (c != EOF);
 334         cfg->remote_cmd_ptr = command;
 335         cfg->remote_cmd_ptr2 = NULL;
 336         cfg->nopty = TRUE;      /* command => no terminal */
 337         fclose(fp);
 338     }
 339     if (!strcmp(p, "-P")) {
 340         RETURN(2);
 341         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 342         SAVEABLE(1);                   /* lower priority than -ssh,-telnet */
 343         cfg->port = atoi(value);
 344     }
 345     if (!strcmp(p, "-pw")) {
 346         RETURN(2);
 347         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 348         SAVEABLE(1);
 349         /* We delay evaluating this until after the protocol is decided,
 350          * so that we can warn if it's of no use with the selected protocol */
 351         if (cfg->protocol != PROT_SSH)
 352             cmdline_error("the -pw option can only be used with the "
 353                           "SSH protocol");
 354         else {
 355             cmdline_password = dupstr(value);
 356             /* Assuming that `value' is directly from argv, make a good faith
 357              * attempt to trample it, to stop it showing up in `ps' output
 358              * on Unix-like systems. Not guaranteed, of course. */
 359             memset(value, 0, strlen(value));
 360         }
 361     }
 362
 363     if (!strcmp(p, "-agent") || !strcmp(p, "-pagent") ||
 364         !strcmp(p, "-pageant")) {
 365         RETURN(1);
 366         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 367         SAVEABLE(0);
 368         cfg->tryagent = TRUE;
 369     }
 370     if (!strcmp(p, "-noagent") || !strcmp(p, "-nopagent") ||
 371         !strcmp(p, "-nopageant")) {
 372         RETURN(1);
 373         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 374         SAVEABLE(0);
 375         cfg->tryagent = FALSE;
 376     }
 377
 378     if (!strcmp(p, "-A")) {
 379         RETURN(1);
 380         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 381         SAVEABLE(0);
 382         cfg->agentfwd = 1;
 383     }
 384     if (!strcmp(p, "-a")) {
 385         RETURN(1);
 386         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 387         SAVEABLE(0);
 388         cfg->agentfwd = 0;
 389     }
 390
 391     if (!strcmp(p, "-X")) {
 392         RETURN(1);
 393         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 394         SAVEABLE(0);
 395         cfg->x11_forward = 1;
 396     }
 397     if (!strcmp(p, "-x")) {
 398         RETURN(1);
 399         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 400         SAVEABLE(0);
 401         cfg->x11_forward = 0;
 402     }
 403
 404     if (!strcmp(p, "-t")) {
 405         RETURN(1);
 406         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 407         SAVEABLE(1);    /* lower priority than -m */
 408         cfg->nopty = 0;
 409     }
 410     if (!strcmp(p, "-T")) {
 411         RETURN(1);
 412         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 413         SAVEABLE(1);
 414         cfg->nopty = 1;
 415     }
 416
 417     if (!strcmp(p, "-N")) {
 418         RETURN(1);
 419         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 420         SAVEABLE(0);
 421         cfg->ssh_no_shell = 1;
 422     }
 423
 424     if (!strcmp(p, "-C")) {
 425         RETURN(1);
 426         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 427         SAVEABLE(0);
 428         cfg->compression = 1;
 429     }
 430
 431     if (!strcmp(p, "-1")) {
 432         RETURN(1);
 433         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 434         SAVEABLE(0);
 435         cfg->sshprot = 0;              /* ssh protocol 1 only */
 436     }
 437     if (!strcmp(p, "-2")) {
 438         RETURN(1);
 439         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 440         SAVEABLE(0);
 441         cfg->sshprot = 3;              /* ssh protocol 2 only */
 442     }
 443
 444     if (!strcmp(p, "-i")) {
 445         RETURN(2);
 446         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 447         SAVEABLE(0);
 448         cfg->keyfile = filename_from_str(value);
 449     }
 450
 451     if (!strcmp(p, "-4") || !strcmp(p, "-ipv4")) {
 452         RETURN(1);
 453         SAVEABLE(1);
 454         cfg->addressfamily = ADDRTYPE_IPV4;
 455     }
 456     if (!strcmp(p, "-6") || !strcmp(p, "-ipv6")) {
 457         RETURN(1);
 458         SAVEABLE(1);
 459         cfg->addressfamily = ADDRTYPE_IPV6;
 460     }
 461     if (!strcmp(p, "-sercfg")) {
 462         char* nextitem;
 463         RETURN(2);
 464         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 465         SAVEABLE(1);
 466         if (cfg->protocol != PROT_SERIAL)
 467             cmdline_error("the -sercfg option can only be used with the "
 468                           "serial protocol");
 469         /* Value[0] contains one or more , separated values, like 19200,8,n,1,X */
 470         nextitem = value;
 471         while (nextitem[0] != '\0') {
 472             int length, skip;
 473             char *end = strchr(nextitem, ',');
 474             if (!end) {
 475                 length = strlen(nextitem);
 476                 skip = 0;
 477             } else {
 478                 length = end - nextitem;
 479                 nextitem[length] = '\0';
 480                 skip = 1;
 481             }
 482             if (length == 1) {
 483                 switch (*nextitem) {
 484                   case '1':
 485                     cfg->serstopbits = 2;
 486                     break;
 487                   case '2':
 488                     cfg->serstopbits = 4;
 489                     break;
 490
 491                   case '5':
 492                     cfg->serdatabits = 5;
 493                     break;
 494                   case '6':
 495                     cfg->serdatabits = 6;
 496                     break;
 497                   case '7':
 498                     cfg->serdatabits = 7;
 499                     break;
 500                   case '8':
 501                     cfg->serdatabits = 8;
 502                     break;
 503                   case '9':
 504                     cfg->serdatabits = 9;
 505                     break;
 506
 507                   case 'n':
 508                     cfg->serparity = SER_PAR_NONE;
 509                     break;
 510                   case 'o':
 511                     cfg->serparity = SER_PAR_ODD;
 512                     break;
 513                   case 'e':
 514                     cfg->serparity = SER_PAR_EVEN;
 515                     break;
 516                   case 'm':
 517                     cfg->serparity = SER_PAR_MARK;
 518                     break;
 519                   case 's':
 520                     cfg->serparity = SER_PAR_SPACE;
 521                     break;
 522
 523                   case 'N':
 524                     cfg->serflow = SER_FLOW_NONE;
 525                     break;
 526                   case 'X':
 527                     cfg->serflow = SER_FLOW_XONXOFF;
 528                     break;
 529                   case 'R':
 530                     cfg->serflow = SER_FLOW_RTSCTS;
 531                     break;
 532                   case 'D':
 533                     cfg->serflow = SER_FLOW_DSRDTR;
 534                     break;
 535
 536                   default:
 537                     cmdline_error("Unrecognised suboption \"-sercfg %c\"",
 538                                   *nextitem);
 539                 }
 540             } else if (length == 3 && !strncmp(nextitem,"1.5",3)) {
 541                 /* Messy special case */
 542                 cfg->serstopbits = 3;
 543             } else {
 544                 int serspeed = atoi(nextitem);
 545                 if (serspeed != 0) {
 546                     cfg->serspeed = serspeed;
 547                 } else {
 548                     cmdline_error("Unrecognised suboption \"-sercfg %s\"",
 549                                   nextitem);
 550                 }
 551             }
 552             nextitem += length + skip;
 553         }
 554     }
 555     return ret;                        /* unrecognised */
 556 }
 557
 558 void cmdline_run_saved(Config *cfg)
 559 {
 560     int pri, i;
 561     for (pri = 0; pri < NPRIORITIES; pri++)
 562         for (i = 0; i < saves[pri].nsaved; i++)
 563             cmdline_process_param(saves[pri].params[i].p,
 564                                   saves[pri].params[i].value, 0, cfg);
 565 }