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 #define SAVEABLE(pri) do { \
  55     if (need_save) { cmdline_save_param(p, value, pri); return ret; } \
  56 } while (0)
  57
  58 char *cmdline_password = NULL;
  59
  60 static int cmdline_get_line(const char *prompt, char *str,
  61                             int maxlen, int is_pw)
  62 {
  63     static int tried_once = 0;
  64
  65     assert(is_pw && cmdline_password);
  66
  67     if (tried_once) {
  68         return 0;
  69     } else {
  70         strncpy(str, cmdline_password, maxlen);
  71         str[maxlen - 1] = '\0';
  72         tried_once = 1;
  73         return 1;
  74     }
  75 }
  76
  77 /*
  78  * Here we have a flags word which describes the capabilities of
  79  * the particular tool on whose behalf we're running. We will
  80  * refuse certain command-line options if a particular tool
  81  * inherently can't do anything sensible. For example, the file
  82  * transfer tools (psftp, pscp) can't do a great deal with protocol
  83  * selections (ever tried running scp over telnet?) or with port
  84  * forwarding (even if it wasn't a hideously bad idea, they don't
  85  * have the select() infrastructure to make them work).
  86  */
  87 int cmdline_tooltype = 0;
  88
  89 static int cmdline_check_unavailable(int flag, char *p)
  90 {
  91     if (cmdline_tooltype & flag) {
  92         cmdline_error("option \"%s\" not available in this tool", p);
  93         return 1;
  94     }
  95     return 0;
  96 }
  97
  98 #define UNAVAILABLE_IN(flag) do { \
  99     if (cmdline_check_unavailable(flag, p)) return ret; \
 100 } while (0)
 101
 102 /*
 103  * Process a standard command-line parameter. `p' is the parameter
 104  * in question; `value' is the subsequent element of argv, which
 105  * may or may not be required as an operand to the parameter.
 106  * Return value is 2 if both arguments were used; 1 if only p was
 107  * used; 0 if the parameter wasn't one we recognised; -2 if it
 108  * should have been 2 but value was NULL.
 109  */
 110
 111 #define RETURN(x) do { \
 112     if ((x) == 2 && !value) return -2; \
 113     ret = x; \
 114     if (need_save < 0) return x; \
 115 } while (0)
 116
 117 int cmdline_process_param(char *p, char *value, int need_save, Config *cfg)
 118 {
 119     int ret = 0;
 120
 121     if (!strcmp(p, "-load")) {
 122         RETURN(2);
 123         /* This parameter must be processed immediately rather than being
 124          * saved. */
 125         do_defaults(value, cfg);
 126         return 2;
 127     }
 128     if (!strcmp(p, "-ssh")) {
 129         RETURN(1);
 130         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 131         SAVEABLE(0);
 132         default_protocol = cfg->protocol = PROT_SSH;
 133         default_port = cfg->port = 22;
 134         return 1;
 135     }
 136     if (!strcmp(p, "-telnet")) {
 137         RETURN(1);
 138         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 139         SAVEABLE(0);
 140         default_protocol = cfg->protocol = PROT_TELNET;
 141         default_port = cfg->port = 23;
 142         return 1;
 143     }
 144     if (!strcmp(p, "-rlogin")) {
 145         RETURN(1);
 146         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 147         SAVEABLE(0);
 148         default_protocol = cfg->protocol = PROT_RLOGIN;
 149         default_port = cfg->port = 513;
 150         return 1;
 151     }
 152     if (!strcmp(p, "-raw")) {
 153         RETURN(1);
 154         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 155         SAVEABLE(0);
 156         default_protocol = cfg->protocol = PROT_RAW;
 157     }
 158     if (!strcmp(p, "-v")) {
 159         RETURN(1);
 160         flags |= FLAG_VERBOSE;
 161     }
 162     if (!strcmp(p, "-l")) {
 163         RETURN(2);
 164         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 165         SAVEABLE(0);
 166         strncpy(cfg->username, value, sizeof(cfg->username));
 167         cfg->username[sizeof(cfg->username) - 1] = '\0';
 168     }
 169     if ((!strcmp(p, "-L") || !strcmp(p, "-R") || !strcmp(p, "-D"))) {
 170         char *fwd, *ptr, *q, *qq;
 171         int dynamic, i=0;
 172         RETURN(2);
 173         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 174         SAVEABLE(0);
 175         dynamic = !strcmp(p, "-D");
 176         fwd = value;
 177         ptr = cfg->portfwd;
 178         /* if multiple forwards, find end of list */
 179         if (ptr[0]=='R' || ptr[0]=='L' || ptr[0] == 'D') {
 180             for (i = 0; i < sizeof(cfg->portfwd) - 2; i++)
 181                 if (ptr[i]=='\000' && ptr[i+1]=='\000')
 182                     break;
 183             ptr = ptr + i + 1;  /* point to next forward slot */
 184         }
 185         ptr[0] = p[1];  /* insert a 'L', 'R' or 'D' at the start */
 186         if (strlen(fwd) > sizeof(cfg->portfwd) - i - 2) {
 187             cmdline_error("out of space for port forwardings");
 188             return ret;
 189         }
 190         strncpy(ptr+1, fwd, sizeof(cfg->portfwd) - i);
 191         if (!dynamic) {
 192             /*
 193              * We expect _at least_ two colons in this string. The
 194              * possible formats are `sourceport:desthost:destport',
 195              * or `sourceip:sourceport:desthost:destport' if you're
 196              * specifying a particular loopback address. We need to
 197              * replace the one between source and dest with a \t;
 198              * this means we must find the second-to-last colon in
 199              * the string.
 200              */
 201             q = qq = strchr(ptr, ':');
 202             while (qq) {
 203                 char *qqq = strchr(qq+1, ':');
 204                 if (qqq)
 205                     q = qq;
 206                 qq = qqq;
 207             }
 208             if (q) *q = '\t';          /* replace second-last colon with \t */
 209         }
 210         cfg->portfwd[sizeof(cfg->portfwd) - 1] = '\0';
 211         cfg->portfwd[sizeof(cfg->portfwd) - 2] = '\0';
 212         ptr[strlen(ptr)+1] = '\000';    /* append two '\000' */
 213     }
 214     if (!strcmp(p, "-m")) {
 215         char *filename, *command;
 216         int cmdlen, cmdsize;
 217         FILE *fp;
 218         int c, d;
 219
 220         RETURN(2);
 221         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 222         SAVEABLE(0);
 223
 224         filename = value;
 225
 226         cmdlen = cmdsize = 0;
 227         command = NULL;
 228         fp = fopen(filename, "r");
 229         if (!fp) {
 230             cmdline_error("unable to open command "
 231                           "file \"%s\"", filename);
 232             return ret;
 233         }
 234         do {
 235             c = fgetc(fp);
 236             d = c;
 237             if (c == EOF)
 238                 d = 0;
 239             if (cmdlen >= cmdsize) {
 240                 cmdsize = cmdlen + 512;
 241                 command = sresize(command, cmdsize, char);
 242             }
 243             command[cmdlen++] = d;
 244         } while (c != EOF);
 245         cfg->remote_cmd_ptr = command;
 246         cfg->remote_cmd_ptr2 = NULL;
 247         cfg->nopty = TRUE;      /* command => no terminal */
 248     }
 249     if (!strcmp(p, "-P")) {
 250         RETURN(2);
 251         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 252         SAVEABLE(1);                   /* lower priority than -ssh,-telnet */
 253         cfg->port = atoi(value);
 254     }
 255     if (!strcmp(p, "-pw")) {
 256         RETURN(2);
 257         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 258         cmdline_password = value;
 259         ssh_get_line = cmdline_get_line;
 260         ssh_getline_pw_only = TRUE;
 261     }
 262
 263     if (!strcmp(p, "-A")) {
 264         RETURN(1);
 265         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 266         SAVEABLE(0);
 267         cfg->agentfwd = 1;
 268     }
 269     if (!strcmp(p, "-a")) {
 270         RETURN(1);
 271         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 272         SAVEABLE(0);
 273         cfg->agentfwd = 0;
 274     }
 275
 276     if (!strcmp(p, "-X")) {
 277         RETURN(1);
 278         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 279         SAVEABLE(0);
 280         cfg->x11_forward = 1;
 281     }
 282     if (!strcmp(p, "-x")) {
 283         RETURN(1);
 284         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 285         SAVEABLE(0);
 286         cfg->x11_forward = 0;
 287     }
 288
 289     if (!strcmp(p, "-t")) {
 290         RETURN(1);
 291         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 292         SAVEABLE(0);
 293         cfg->nopty = 0;
 294     }
 295     if (!strcmp(p, "-T")) {
 296         RETURN(1);
 297         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER | TOOLTYPE_NONNETWORK);
 298         SAVEABLE(0);
 299         cfg->nopty = 1;
 300     }
 301
 302     if (!strcmp(p, "-C")) {
 303         RETURN(1);
 304         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 305         SAVEABLE(0);
 306         cfg->compression = 1;
 307     }
 308
 309     if (!strcmp(p, "-1")) {
 310         RETURN(1);
 311         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 312         SAVEABLE(0);
 313         cfg->sshprot = 0;              /* ssh protocol 1 only */
 314     }
 315     if (!strcmp(p, "-2")) {
 316         RETURN(1);
 317         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 318         SAVEABLE(0);
 319         cfg->sshprot = 3;              /* ssh protocol 2 only */
 320     }
 321
 322     if (!strcmp(p, "-i")) {
 323         RETURN(2);
 324         UNAVAILABLE_IN(TOOLTYPE_NONNETWORK);
 325         SAVEABLE(0);
 326         cfg->keyfile = filename_from_str(value);
 327     }
 328
 329     return ret;                        /* unrecognised */
 330 }
 331
 332 void cmdline_run_saved(Config *cfg)
 333 {
 334     int pri, i;
 335     for (pri = 0; pri < NPRIORITIES; pri++)
 336         for (i = 0; i < saves[pri].nsaved; i++)
 337             cmdline_process_param(saves[pri].params[i].p,
 338                                   saves[pri].params[i].value, 0, cfg);
 339 }