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  * Return value is 2 if both arguments were used; 1 if only p was
 115  * used; 0 if the parameter wasn't one we recognised; -2 if it
 116  * should have been 2 but value was NULL.
 117  */
 118
 119 #define RETURN(x) do { \
 120     if ((x) == 2 && !value) return -2; \
 121     ret = x; \
 122     if (need_save < 0) return x; \
 123 } while (0)
 124
 125 int cmdline_process_param(char *p, char *value, int need_save, Config *cfg)
 126 {
 127     int ret = 0;
 128
 129     if (!strcmp(p, "-load")) {
 130         RETURN(2);
 131         /* This parameter must be processed immediately rather than being
 132          * saved. */
 133         do_defaults(value, cfg);
 134         return 2;
 135     }
 136     if (!strcmp(p, "-ssh")) {
 137         RETURN(1);
 138         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 139         SAVEABLE(0);
 140         default_protocol = cfg->protocol = PROT_SSH;
 141         default_port = cfg->port = 22;
 142         return 1;
 143     }
 144     if (!strcmp(p, "-telnet")) {
 145         RETURN(1);
 146         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 147         SAVEABLE(0);
 148         default_protocol = cfg->protocol = PROT_TELNET;
 149         default_port = cfg->port = 23;
 150         return 1;
 151     }
 152     if (!strcmp(p, "-rlogin")) {
 153         RETURN(1);
 154         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 155         SAVEABLE(0);
 156         default_protocol = cfg->protocol = PROT_RLOGIN;
 157         default_port = cfg->port = 513;
 158         return 1;
 159     }
 160     if (!strcmp(p, "-raw")) {
 161         RETURN(1);
 162         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 163         SAVEABLE(0);
 164         default_protocol = cfg->protocol = PROT_RAW;
 165     }
 166     if (!strcmp(p, "-v")) {
 167         RETURN(1);
 168         flags |= FLAG_VERBOSE;
 169     }
 170     if (!strcmp(p, "-l")) {
 171         RETURN(2);
 172         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 173         SAVEABLE(0);
 174         strncpy(cfg->username, value, sizeof(cfg->username));
 175         cfg->username[sizeof(cfg->username) - 1] = '\0';
 176     }
 177     if ((!strcmp(p, "-L") || !strcmp(p, "-R") || !strcmp(p, "-D"))) {
 178         char *fwd, *ptr, *q, *qq;
 179         int dynamic, i=0;
 180         RETURN(2);
 181         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 182         SAVEABLE(0);
 183         dynamic = !strcmp(p, "-D");
 184         fwd = value;
 185         ptr = cfg->portfwd;
 186         /* if multiple forwards, find end of list */
 187         if (ptr[0]=='R' || ptr[0]=='L' || ptr[0] == 'D') {
 188             for (i = 0; i < sizeof(cfg->portfwd) - 2; i++)
 189                 if (ptr[i]=='\000' && ptr[i+1]=='\000')
 190                     break;
 191             ptr = ptr + i + 1;  /* point to next forward slot */
 192         }
 193         ptr[0] = p[1];  /* insert a 'L', 'R' or 'D' at the start */
 194         if (strlen(fwd) > sizeof(cfg->portfwd) - i - 2) {
 195             cmdline_error("out of space for port forwardings");
 196             return ret;
 197         }
 198         strncpy(ptr+1, fwd, sizeof(cfg->portfwd) - i);
 199         if (!dynamic) {
 200             /*
 201              * We expect _at least_ two colons in this string. The
 202              * possible formats are `sourceport:desthost:destport',
 203              * or `sourceip:sourceport:desthost:destport' if you're
 204              * specifying a particular loopback address. We need to
 205              * replace the one between source and dest with a \t;
 206              * this means we must find the second-to-last colon in
 207              * the string.
 208              */
 209             q = qq = strchr(ptr, ':');
 210             while (qq) {
 211                 char *qqq = strchr(qq+1, ':');
 212                 if (qqq)
 213                     q = qq;
 214                 qq = qqq;
 215             }
 216             if (q) *q = '\t';          /* replace second-last colon with \t */
 217         }
 218         cfg->portfwd[sizeof(cfg->portfwd) - 1] = '\0';
 219         cfg->portfwd[sizeof(cfg->portfwd) - 2] = '\0';
 220         ptr[strlen(ptr)+1] = '\000';    /* append two '\000' */
 221     }
 222     if (!strcmp(p, "-m")) {
 223         char *filename, *command;
 224         int cmdlen, cmdsize;
 225         FILE *fp;
 226         int c, d;
 227
 228         RETURN(2);
 229         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 230         SAVEABLE(0);
 231
 232         filename = value;
 233
 234         cmdlen = cmdsize = 0;
 235         command = NULL;
 236         fp = fopen(filename, "r");
 237         if (!fp) {
 238             cmdline_error("unable to open command "
 239                           "file \"%s\"", filename);
 240             return ret;
 241         }
 242         do {
 243             c = fgetc(fp);
 244             d = c;
 245             if (c == EOF)
 246                 d = 0;
 247             if (cmdlen >= cmdsize) {
 248                 cmdsize = cmdlen + 512;
 249                 command = sresize(command, cmdsize, char);
 250             }
 251             command[cmdlen++] = d;
 252         } while (c != EOF);
 253         cfg->remote_cmd_ptr = command;
 254         cfg->remote_cmd_ptr2 = NULL;
 255         cfg->nopty = TRUE;      /* command => no terminal */
 256     }
 257     if (!strcmp(p, "-P")) {
 258         RETURN(2);
 259         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 260         SAVEABLE(1);                   /* lower priority than -ssh,-telnet */
 261         cfg->port = atoi(value);
 262     }
 263     if (!strcmp(p, "-pw")) {
 264         RETURN(2);
 265         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 266         cmdline_password = value;
 267         ssh_get_line = cmdline_get_line;
 268         ssh_getline_pw_only = TRUE;
 269     }
 270
 271     if (!strcmp(p, "-A")) {
 272         RETURN(1);
 273         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 274         SAVEABLE(0);
 275         cfg->agentfwd = 1;
 276     }
 277     if (!strcmp(p, "-a")) {
 278         RETURN(1);
 279         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 280         SAVEABLE(0);
 281         cfg->agentfwd = 0;
 282     }
 283
 284     if (!strcmp(p, "-X")) {
 285         RETURN(1);
 286         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 287         SAVEABLE(0);
 288         cfg->x11_forward = 1;
 289     }
 290     if (!strcmp(p, "-x")) {
 291         RETURN(1);
 292         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 293         SAVEABLE(0);
 294         cfg->x11_forward = 0;
 295     }
 296
 297     if (!strcmp(p, "-t")) {
 298         RETURN(1);
 299         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 300         SAVEABLE(0);
 301         cfg->nopty = 0;
 302     }
 303     if (!strcmp(p, "-T")) {
 304         RETURN(1);
 305         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 306         SAVEABLE(0);
 307         cfg->nopty = 1;
 308     }
 309
 310     if (!strcmp(p, "-C")) {
 311         RETURN(1);
 312         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 313         SAVEABLE(0);
 314         cfg->compression = 1;
 315     }
 316
 317     if (!strcmp(p, "-1")) {
 318         RETURN(1);
 319         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 320         SAVEABLE(0);
 321         cfg->sshprot = 0;              /* ssh protocol 1 only */
 322     }
 323     if (!strcmp(p, "-2")) {
 324         RETURN(1);
 325         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 326         SAVEABLE(0);
 327         cfg->sshprot = 3;              /* ssh protocol 2 only */
 328     }
 329
 330     if (!strcmp(p, "-i")) {
 331         RETURN(2);
 332         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 333         SAVEABLE(0);
 334         cfg->keyfile = filename_from_str(value);
 335     }
 336
 337     return ret;                        /* unrecognised */
 338 }
 339
 340 void cmdline_run_saved(Config *cfg)
 341 {
 342     int pri, i;
 343     for (pri = 0; pri < NPRIORITIES; pri++)
 344         for (i = 0; i < saves[pri].nsaved; i++)
 345             cmdline_process_param(saves[pri].params[i].p,
 346                                   saves[pri].params[i].value, 0, cfg);
 347 }