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 void cmdline_cleanup(void)
  60 {
  61     int pri;
  62
  63     for (pri = 0; pri < NPRIORITIES; pri++)
  64         sfree(saves[pri].params);
  65 }
  66
  67 #define SAVEABLE(pri) do { \
  68     if (need_save) { cmdline_save_param(p, value, pri); return ret; } \
  69 } while (0)
  70
  71 static char *cmdline_password = NULL;
  72
  73 /*
  74  * Similar interface to get_userpass_input(), except that here a -1
  75  * return means that we aren't capable of processing the prompt and
  76  * someone else should do it.
  77  */
  78 int cmdline_get_passwd_input(prompts_t *p, unsigned char *in, int inlen) {
  79
  80     static int tried_once = 0;
  81
  82     /*
  83      * We only handle prompts which don't echo (which we assume to be
  84      * passwords), and (currently) we only cope with a password prompt
  85      * that comes in a prompt-set on its own.
  86      */
  87     if (!cmdline_password || in || p->n_prompts != 1 || p->prompts[0]->echo) {
  88         return -1;
  89     }
  90
  91     /*
  92      * If we've tried once, return utter failure (no more passwords left
  93      * to try).
  94      */
  95     if (tried_once)
  96         return 0;
  97
  98     strncpy(p->prompts[0]->result, cmdline_password,
  99             p->prompts[0]->result_len);
 100     p->prompts[0]->result[p->prompts[0]->result_len-1] = '\0';
 101     memset(cmdline_password, 0, strlen(cmdline_password));
 102     tried_once = 1;
 103     return 1;
 104
 105 }
 106
 107 /*
 108  * Here we have a flags word which describes the capabilities of
 109  * the particular tool on whose behalf we're running. We will
 110  * refuse certain command-line options if a particular tool
 111  * inherently can't do anything sensible. For example, the file
 112  * transfer tools (psftp, pscp) can't do a great deal with protocol
 113  * selections (ever tried running scp over telnet?) or with port
 114  * forwarding (even if it wasn't a hideously bad idea, they don't
 115  * have the select() infrastructure to make them work).
 116  */
 117 int cmdline_tooltype = 0;
 118
 119 static int cmdline_check_unavailable(int flag, char *p)
 120 {
 121     if (cmdline_tooltype & flag) {
 122         cmdline_error("option \"%s\" not available in this tool", p);
 123         return 1;
 124     }
 125     return 0;
 126 }
 127
 128 #define UNAVAILABLE_IN(flag) do { \
 129     if (cmdline_check_unavailable(flag, p)) return ret; \
 130 } while (0)
 131
 132 /*
 133  * Process a standard command-line parameter. `p' is the parameter
 134  * in question; `value' is the subsequent element of argv, which
 135  * may or may not be required as an operand to the parameter.
 136  * If `need_save' is 1, arguments which need to be saved as
 137  * described at this top of this file are, for later execution;
 138  * if 0, they are processed normally. (-1 is a special value used
 139  * by pterm to count arguments for a preliminary pass through the
 140  * argument list; it causes immediate return with an appropriate
 141  * value with no action taken.)
 142  * Return value is 2 if both arguments were used; 1 if only p was
 143  * used; 0 if the parameter wasn't one we recognised; -2 if it
 144  * should have been 2 but value was NULL.
 145  */
 146
 147 #define RETURN(x) do { \
 148     if ((x) == 2 && !value) return -2; \
 149     ret = x; \
 150     if (need_save < 0) return x; \
 151 } while (0)
 152
 153 int cmdline_process_param(char *p, char *value, int need_save, Config *cfg)
 154 {
 155     int ret = 0;
 156
 157     if (!strcmp(p, "-load")) {
 158         RETURN(2);
 159         /* This parameter must be processed immediately rather than being
 160          * saved. */
 161         do_defaults(value, cfg);
 162         loaded_session = TRUE;
 163         return 2;
 164     }
 165     if (!strcmp(p, "-ssh")) {
 166         RETURN(1);
 167         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 168         SAVEABLE(0);
 169         default_protocol = cfg->protocol = PROT_SSH;
 170         default_port = cfg->port = 22;
 171         return 1;
 172     }
 173     if (!strcmp(p, "-telnet")) {
 174         RETURN(1);
 175         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 176         SAVEABLE(0);
 177         default_protocol = cfg->protocol = PROT_TELNET;
 178         default_port = cfg->port = 23;
 179         return 1;
 180     }
 181     if (!strcmp(p, "-rlogin")) {
 182         RETURN(1);
 183         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 184         SAVEABLE(0);
 185         default_protocol = cfg->protocol = PROT_RLOGIN;
 186         default_port = cfg->port = 513;
 187         return 1;
 188     }
 189     if (!strcmp(p, "-raw")) {
 190         RETURN(1);
 191         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 192         SAVEABLE(0);
 193         default_protocol = cfg->protocol = PROT_RAW;
 194     }
 195     if (!strcmp(p, "-v")) {
 196         RETURN(1);
 197         flags |= FLAG_VERBOSE;
 198     }
 199     if (!strcmp(p, "-l")) {
 200         RETURN(2);
 201         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 202         SAVEABLE(0);
 203         strncpy(cfg->username, value, sizeof(cfg->username));
 204         cfg->username[sizeof(cfg->username) - 1] = '\0';
 205     }
 206     if ((!strcmp(p, "-L") || !strcmp(p, "-R") || !strcmp(p, "-D"))) {
 207         char *fwd, *ptr, *q, *qq;
 208         int dynamic, i=0;
 209         RETURN(2);
 210         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 211         SAVEABLE(0);
 212         dynamic = !strcmp(p, "-D");
 213         fwd = value;
 214         ptr = cfg->portfwd;
 215         /* if existing forwards, find end of list */
 216         while (*ptr) {
 217             while (*ptr)
 218                 ptr++;
 219             ptr++;
 220         }
 221         i = ptr - cfg->portfwd;
 222         ptr[0] = p[1];  /* insert a 'L', 'R' or 'D' at the start */
 223         ptr++;
 224         if (1 + strlen(fwd) + 2 > sizeof(cfg->portfwd) - i) {
 225             cmdline_error("out of space for port forwardings");
 226             return ret;
 227         }
 228         strncpy(ptr, fwd, sizeof(cfg->portfwd) - i - 2);
 229         if (!dynamic) {
 230             /*
 231              * We expect _at least_ two colons in this string. The
 232              * possible formats are `sourceport:desthost:destport',
 233              * or `sourceip:sourceport:desthost:destport' if you're
 234              * specifying a particular loopback address. We need to
 235              * replace the one between source and dest with a \t;
 236              * this means we must find the second-to-last colon in
 237              * the string.
 238              */
 239             q = qq = strchr(ptr, ':');
 240             while (qq) {
 241                 char *qqq = strchr(qq+1, ':');
 242                 if (qqq)
 243                     q = qq;
 244                 qq = qqq;
 245             }
 246             if (q) *q = '\t';          /* replace second-last colon with \t */
 247         }
 248         cfg->portfwd[sizeof(cfg->portfwd) - 1] = '\0';
 249         cfg->portfwd[sizeof(cfg->portfwd) - 2] = '\0';
 250         ptr[strlen(ptr)+1] = '\000';    /* append 2nd '\000' */
 251     }
 252     if ((!strcmp(p, "-nc"))) {
 253         char *host, *portp;
 254
 255         RETURN(2);
 256         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 257         SAVEABLE(0);
 258
 259         host = portp = value;
 260         while (*portp && *portp != ':')
 261             portp++;
 262         if (*portp) {
 263             unsigned len = portp - host;
 264             if (len >= sizeof(cfg->ssh_nc_host))
 265                 len = sizeof(cfg->ssh_nc_host) - 1;
 266             strncpy(cfg->ssh_nc_host, value, len);
 267             cfg->ssh_nc_host[sizeof(cfg->ssh_nc_host) - 1] = '\0';
 268             cfg->ssh_nc_port = atoi(portp+1);
 269         } else {
 270             cmdline_error("-nc expects argument of form 'host:port'");
 271             return ret;
 272         }
 273     }
 274     if (!strcmp(p, "-m")) {
 275         char *filename, *command;
 276         int cmdlen, cmdsize;
 277         FILE *fp;
 278         int c, d;
 279
 280         RETURN(2);
 281         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 282         SAVEABLE(0);
 283
 284         filename = value;
 285
 286         cmdlen = cmdsize = 0;
 287         command = NULL;
 288         fp = fopen(filename, "r");
 289         if (!fp) {
 290             cmdline_error("unable to open command "
 291                           "file \"%s\"", filename);
 292             return ret;
 293         }
 294         do {
 295             c = fgetc(fp);
 296             d = c;
 297             if (c == EOF)
 298                 d = 0;
 299             if (cmdlen >= cmdsize) {
 300                 cmdsize = cmdlen + 512;
 301                 command = sresize(command, cmdsize, char);
 302             }
 303             command[cmdlen++] = d;
 304         } while (c != EOF);
 305         cfg->remote_cmd_ptr = command;
 306         cfg->remote_cmd_ptr2 = NULL;
 307         cfg->nopty = TRUE;      /* command => no terminal */
 308     }
 309     if (!strcmp(p, "-P")) {
 310         RETURN(2);
 311         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 312         SAVEABLE(1);                   /* lower priority than -ssh,-telnet */
 313         cfg->port = atoi(value);
 314     }
 315     if (!strcmp(p, "-pw")) {
 316         RETURN(2);
 317         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 318         SAVEABLE(1);
 319         /* We delay evaluating this until after the protocol is decided,
 320          * so that we can warn if it's of no use with the selected protocol */
 321         if (cfg->protocol != PROT_SSH)
 322             cmdline_error("the -pw option can only be used with the "
 323                           "SSH protocol");
 324         else {
 325             cmdline_password = dupstr(value);
 326             /* Assuming that `value' is directly from argv, make a good faith
 327              * attempt to trample it, to stop it showing up in `ps' output
 328              * on Unix-like systems. Not guaranteed, of course. */
 329             memset(value, 0, strlen(value));
 330         }
 331     }
 332
 333     if (!strcmp(p, "-agent") || !strcmp(p, "-pagent") ||
 334         !strcmp(p, "-pageant")) {
 335         RETURN(1);
 336         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 337         SAVEABLE(0);
 338         cfg->tryagent = TRUE;
 339     }
 340     if (!strcmp(p, "-noagent") || !strcmp(p, "-nopagent") ||
 341         !strcmp(p, "-nopageant")) {
 342         RETURN(1);
 343         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 344         SAVEABLE(0);
 345         cfg->tryagent = FALSE;
 346     }
 347
 348     if (!strcmp(p, "-A")) {
 349         RETURN(1);
 350         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 351         SAVEABLE(0);
 352         cfg->agentfwd = 1;
 353     }
 354     if (!strcmp(p, "-a")) {
 355         RETURN(1);
 356         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 357         SAVEABLE(0);
 358         cfg->agentfwd = 0;
 359     }
 360
 361     if (!strcmp(p, "-X")) {
 362         RETURN(1);
 363         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 364         SAVEABLE(0);
 365         cfg->x11_forward = 1;
 366     }
 367     if (!strcmp(p, "-x")) {
 368         RETURN(1);
 369         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 370         SAVEABLE(0);
 371         cfg->x11_forward = 0;
 372     }
 373
 374     if (!strcmp(p, "-t")) {
 375         RETURN(1);
 376         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 377         SAVEABLE(0);
 378         cfg->nopty = 0;
 379     }
 380     if (!strcmp(p, "-T")) {
 381         RETURN(1);
 382         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 383         SAVEABLE(0);
 384         cfg->nopty = 1;
 385     }
 386
 387     if (!strcmp(p, "-N")) {
 388         RETURN(1);
 389         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 390         SAVEABLE(0);
 391         cfg->ssh_no_shell = 1;
 392     }
 393
 394     if (!strcmp(p, "-C")) {
 395         RETURN(1);
 396         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 397         SAVEABLE(0);
 398         cfg->compression = 1;
 399     }
 400
 401     if (!strcmp(p, "-1")) {
 402         RETURN(1);
 403         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 404         SAVEABLE(0);
 405         cfg->sshprot = 0;              /* ssh protocol 1 only */
 406     }
 407     if (!strcmp(p, "-2")) {
 408         RETURN(1);
 409         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 410         SAVEABLE(0);
 411         cfg->sshprot = 3;              /* ssh protocol 2 only */
 412     }
 413
 414     if (!strcmp(p, "-i")) {
 415         RETURN(2);
 416         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 417         SAVEABLE(0);
 418         cfg->keyfile = filename_from_str(value);
 419     }
 420
 421     if (!strcmp(p, "-4") || !strcmp(p, "-ipv4")) {
 422         RETURN(1);
 423         SAVEABLE(1);
 424         cfg->addressfamily = ADDRTYPE_IPV4;
 425     }
 426     if (!strcmp(p, "-6") || !strcmp(p, "-ipv6")) {
 427         RETURN(1);
 428         SAVEABLE(1);
 429         cfg->addressfamily = ADDRTYPE_IPV6;
 430     }
 431
 432     return ret;                        /* unrecognised */
 433 }
 434
 435 void cmdline_run_saved(Config *cfg)
 436 {
 437     int pri, i;
 438     for (pri = 0; pri < NPRIORITIES; pri++)
 439         for (i = 0; i < saves[pri].nsaved; i++)
 440             cmdline_process_param(saves[pri].params[i].p,
 441                                   saves[pri].params[i].value, 0, cfg);
 442 }