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

   1 #include <stdio.h>
   2 #include <assert.h>
   3 #include <stdlib.h>
   4 #include "putty.h"
   5
   6 /*
   7  * Some command-line parameters need to be saved up until after
   8  * we've loaded the saved session which will form the basis of our
   9  * eventual running configuration. For this we use the macro
  10  * SAVEABLE, which notices if the `need_save' parameter is set and
  11  * saves the parameter and value on a list.
  12  *
  13  * We also assign priorities to saved parameters, just to slightly
  14  * ameliorate silly ordering problems. For example, if you specify
  15  * a saved session to load, it will be loaded _before_ all your
  16  * local modifications such as -L are evaluated; and if you specify
  17  * a protocol and a port, the protocol is set up first so that the
  18  * port can override its choice of port number.
  19  *
  20  * (In fact -load is not saved at all, since in at least Plink the
  21  * processing of further command-line options depends on whether or
  22  * not the loaded session contained a hostname. So it must be
  23  * executed immediately.)
  24  */
  25
  26 #define NPRIORITIES 2
  27
  28 struct cmdline_saved_param {
  29     char *p, *value;
  30 };
  31 struct cmdline_saved_param_set {
  32     struct cmdline_saved_param *params;
  33     int nsaved, savesize;
  34 };
  35
  36 /*
  37  * C guarantees this structure will be initialised to all zero at
  38  * program start, which is exactly what we want.
  39  */
  40 static struct cmdline_saved_param_set saves[NPRIORITIES];
  41
  42 static void cmdline_save_param(char *p, char *value, int pri)
  43 {
  44     if (saves[pri].nsaved >= saves[pri].savesize) {
  45         saves[pri].savesize = saves[pri].nsaved + 32;
  46         saves[pri].params = sresize(saves[pri].params, saves[pri].savesize,
  47                                     struct cmdline_saved_param);
  48     }
  49     saves[pri].params[saves[pri].nsaved].p = p;
  50     saves[pri].params[saves[pri].nsaved].value = value;
  51     saves[pri].nsaved++;
  52 }
  53
  54 void cmdline_cleanup(void)
  55 {
  56     int pri;
  57
  58     for (pri = 0; pri < NPRIORITIES; pri++)
  59         sfree(saves[pri].params);
  60 }
  61
  62 #define SAVEABLE(pri) do { \
  63     if (need_save) { cmdline_save_param(p, value, pri); return ret; } \
  64 } while (0)
  65
  66 char *cmdline_password = NULL;
  67
  68 static int cmdline_get_line(const char *prompt, char *str,
  69                             int maxlen, int is_pw)
  70 {
  71     static int tried_once = 0;
  72
  73     assert(is_pw && cmdline_password);
  74
  75     if (tried_once) {
  76         return 0;
  77     } else {
  78         strncpy(str, cmdline_password, maxlen);
  79         str[maxlen - 1] = '\0';
  80         tried_once = 1;
  81         return 1;
  82     }
  83 }
  84
  85 /*
  86  * Here we have a flags word which describes the capabilities of
  87  * the particular tool on whose behalf we're running. We will
  88  * refuse certain command-line options if a particular tool
  89  * inherently can't do anything sensible. For example, the file
  90  * transfer tools (psftp, pscp) can't do a great deal with protocol
  91  * selections (ever tried running scp over telnet?) or with port
  92  * forwarding (even if it wasn't a hideously bad idea, they don't
  93  * have the select() infrastructure to make them work).
  94  */
  95 int cmdline_tooltype = 0;
  96
  97 static int cmdline_check_unavailable(int flag, char *p)
  98 {
  99     if (cmdline_tooltype & flag) {
 100         cmdline_error("option \"%s\" not available in this tool", p);
 101         return 1;
 102     }
 103     return 0;
 104 }
 105
 106 #define UNAVAILABLE_IN(flag) do { \
 107     if (cmdline_check_unavailable(flag, p)) return ret; \
 108 } while (0)
 109
 110 /*
 111  * Process a standard command-line parameter. `p' is the parameter
 112  * in question; `value' is the subsequent element of argv, which
 113  * may or may not be required as an operand to the parameter.
 114  * If `need_save' is 1, arguments which need to be saved as
 115  * described at this top of this file are, for later execution;
 116  * if 0, they are processed normally. (-1 is a special value used
 117  * by pterm to count arguments for a preliminary pass through the
 118  * argument list; it causes immediate return with an appropriate
 119  * value with no action taken.)
 120  * Return value is 2 if both arguments were used; 1 if only p was
 121  * used; 0 if the parameter wasn't one we recognised; -2 if it
 122  * should have been 2 but value was NULL.
 123  */
 124
 125 #define RETURN(x) do { \
 126     if ((x) == 2 && !value) return -2; \
 127     ret = x; \
 128     if (need_save < 0) return x; \
 129 } while (0)
 130
 131 int cmdline_process_param(char *p, char *value, int need_save, Config *cfg)
 132 {
 133     int ret = 0;
 134
 135     if (!strcmp(p, "-load")) {
 136         RETURN(2);
 137         /* This parameter must be processed immediately rather than being
 138          * saved. */
 139         do_defaults(value, cfg);
 140         loaded_session = TRUE;
 141         return 2;
 142     }
 143     if (!strcmp(p, "-ssh")) {
 144         RETURN(1);
 145         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 146         SAVEABLE(0);
 147         default_protocol = cfg->protocol = PROT_SSH;
 148         default_port = cfg->port = 22;
 149         return 1;
 150     }
 151     if (!strcmp(p, "-telnet")) {
 152         RETURN(1);
 153         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 154         SAVEABLE(0);
 155         default_protocol = cfg->protocol = PROT_TELNET;
 156         default_port = cfg->port = 23;
 157         return 1;
 158     }
 159     if (!strcmp(p, "-rlogin")) {
 160         RETURN(1);
 161         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 162         SAVEABLE(0);
 163         default_protocol = cfg->protocol = PROT_RLOGIN;
 164         default_port = cfg->port = 513;
 165         return 1;
 166     }
 167     if (!strcmp(p, "-raw")) {
 168         RETURN(1);
 169         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 170         SAVEABLE(0);
 171         default_protocol = cfg->protocol = PROT_RAW;
 172     }
 173     if (!strcmp(p, "-v")) {
 174         RETURN(1);
 175         flags |= FLAG_VERBOSE;
 176     }
 177     if (!strcmp(p, "-l")) {
 178         RETURN(2);
 179         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 180         SAVEABLE(0);
 181         strncpy(cfg->username, value, sizeof(cfg->username));
 182         cfg->username[sizeof(cfg->username) - 1] = '\0';
 183     }
 184     if ((!strcmp(p, "-L") || !strcmp(p, "-R") || !strcmp(p, "-D"))) {
 185         char *fwd, *ptr, *q, *qq;
 186         int dynamic, i=0;
 187         RETURN(2);
 188         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 189         SAVEABLE(0);
 190         dynamic = !strcmp(p, "-D");
 191         fwd = value;
 192         ptr = cfg->portfwd;
 193         /* if existing forwards, find end of list */
 194         while (*ptr) {
 195             while (*ptr)
 196                 ptr++;
 197             ptr++;
 198         }
 199         i = ptr - cfg->portfwd;
 200         ptr[0] = p[1];  /* insert a 'L', 'R' or 'D' at the start */
 201         ptr++;
 202         if (1 + strlen(fwd) + 2 > sizeof(cfg->portfwd) - i) {
 203             cmdline_error("out of space for port forwardings");
 204             return ret;
 205         }
 206         strncpy(ptr, fwd, sizeof(cfg->portfwd) - i - 2);
 207         if (!dynamic) {
 208             /*
 209              * We expect _at least_ two colons in this string. The
 210              * possible formats are `sourceport:desthost:destport',
 211              * or `sourceip:sourceport:desthost:destport' if you're
 212              * specifying a particular loopback address. We need to
 213              * replace the one between source and dest with a \t;
 214              * this means we must find the second-to-last colon in
 215              * the string.
 216              */
 217             q = qq = strchr(ptr, ':');
 218             while (qq) {
 219                 char *qqq = strchr(qq+1, ':');
 220                 if (qqq)
 221                     q = qq;
 222                 qq = qqq;
 223             }
 224             if (q) *q = '\t';          /* replace second-last colon with \t */
 225         }
 226         cfg->portfwd[sizeof(cfg->portfwd) - 1] = '\0';
 227         cfg->portfwd[sizeof(cfg->portfwd) - 2] = '\0';
 228         ptr[strlen(ptr)+1] = '\000';    /* append 2nd '\000' */
 229     }
 230     if (!strcmp(p, "-m")) {
 231         char *filename, *command;
 232         int cmdlen, cmdsize;
 233         FILE *fp;
 234         int c, d;
 235
 236         RETURN(2);
 237         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 238         SAVEABLE(0);
 239
 240         filename = value;
 241
 242         cmdlen = cmdsize = 0;
 243         command = NULL;
 244         fp = fopen(filename, "r");
 245         if (!fp) {
 246             cmdline_error("unable to open command "
 247                           "file \"%s\"", filename);
 248             return ret;
 249         }
 250         do {
 251             c = fgetc(fp);
 252             d = c;
 253             if (c == EOF)
 254                 d = 0;
 255             if (cmdlen >= cmdsize) {
 256                 cmdsize = cmdlen + 512;
 257                 command = sresize(command, cmdsize, char);
 258             }
 259             command[cmdlen++] = d;
 260         } while (c != EOF);
 261         cfg->remote_cmd_ptr = command;
 262         cfg->remote_cmd_ptr2 = NULL;
 263         cfg->nopty = TRUE;      /* command => no terminal */
 264     }
 265     if (!strcmp(p, "-P")) {
 266         RETURN(2);
 267         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 268         SAVEABLE(1);                   /* lower priority than -ssh,-telnet */
 269         cfg->port = atoi(value);
 270     }
 271     if (!strcmp(p, "-pw")) {
 272         RETURN(2);
 273         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 274         cmdline_password = value;
 275         ssh_get_line = cmdline_get_line;
 276         ssh_getline_pw_only = TRUE;
 277     }
 278
 279     if (!strcmp(p, "-A")) {
 280         RETURN(1);
 281         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 282         SAVEABLE(0);
 283         cfg->agentfwd = 1;
 284     }
 285     if (!strcmp(p, "-a")) {
 286         RETURN(1);
 287         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 288         SAVEABLE(0);
 289         cfg->agentfwd = 0;
 290     }
 291
 292     if (!strcmp(p, "-X")) {
 293         RETURN(1);
 294         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 295         SAVEABLE(0);
 296         cfg->x11_forward = 1;
 297     }
 298     if (!strcmp(p, "-x")) {
 299         RETURN(1);
 300         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 301         SAVEABLE(0);
 302         cfg->x11_forward = 0;
 303     }
 304
 305     if (!strcmp(p, "-t")) {
 306         RETURN(1);
 307         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 308         SAVEABLE(0);
 309         cfg->nopty = 0;
 310     }
 311     if (!strcmp(p, "-T")) {
 312         RETURN(1);
 313         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 314         SAVEABLE(0);
 315         cfg->nopty = 1;
 316     }
 317
 318     if (!strcmp(p, "-N")) {
 319         RETURN(1);
 320         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 321         SAVEABLE(0);
 322         cfg->ssh_no_shell = 1;
 323     }
 324
 325     if (!strcmp(p, "-C")) {
 326         RETURN(1);
 327         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 328         SAVEABLE(0);
 329         cfg->compression = 1;
 330     }
 331
 332     if (!strcmp(p, "-1")) {
 333         RETURN(1);
 334         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 335         SAVEABLE(0);
 336         cfg->sshprot = 0;              /* ssh protocol 1 only */
 337     }
 338     if (!strcmp(p, "-2")) {
 339         RETURN(1);
 340         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 341         SAVEABLE(0);
 342         cfg->sshprot = 3;              /* ssh protocol 2 only */
 343     }
 344
 345     if (!strcmp(p, "-i")) {
 346         RETURN(2);
 347         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 348         SAVEABLE(0);
 349         cfg->keyfile = filename_from_str(value);
 350     }
 351
 352     if (!strcmp(p, "-4") || !strcmp(p, "-ipv4")) {
 353         RETURN(1);
 354         SAVEABLE(1);
 355         cfg->addressfamily = ADDRTYPE_IPV4;
 356     }
 357     if (!strcmp(p, "-6") || !strcmp(p, "-ipv6")) {
 358         RETURN(1);
 359         SAVEABLE(1);
 360         cfg->addressfamily = ADDRTYPE_IPV6;
 361     }
 362
 363     return ret;                        /* unrecognised */
 364 }
 365
 366 void cmdline_run_saved(Config *cfg)
 367 {
 368     int pri, i;
 369     for (pri = 0; pri < NPRIORITIES; pri++)
 370         for (i = 0; i < saves[pri].nsaved; i++)
 371             cmdline_process_param(saves[pri].params[i].p,
 372                                   saves[pri].params[i].value, 0, cfg);
 373 }