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 =
  47             srealloc(saves[pri].params,
  48                      saves[pri].savesize*sizeof(*saves[pri].params));
  49     }
  50     saves[pri].params[saves[pri].nsaved].p = p;
  51     saves[pri].params[saves[pri].nsaved].value = value;
  52     saves[pri].nsaved++;
  53 }
  54
  55 #define SAVEABLE(pri) do { \
  56     if (need_save) { cmdline_save_param(p, value, pri); return ret; } \
  57 } while (0)
  58
  59 char *cmdline_password = NULL;
  60
  61 static int cmdline_get_line(const char *prompt, char *str,
  62                             int maxlen, int is_pw)
  63 {
  64     static int tried_once = 0;
  65
  66     assert(is_pw && cmdline_password);
  67
  68     if (tried_once) {
  69         return 0;
  70     } else {
  71         strncpy(str, cmdline_password, maxlen);
  72         str[maxlen - 1] = '\0';
  73         tried_once = 1;
  74         return 1;
  75     }
  76 }
  77
  78 /*
  79  * Here we have a flags word which describes the capabilities of
  80  * the particular tool on whose behalf we're running. We will
  81  * refuse certain command-line options if a particular tool
  82  * inherently can't do anything sensible. For example, the file
  83  * transfer tools (psftp, pscp) can't do a great deal with protocol
  84  * selections (ever tried running scp over telnet?) or with port
  85  * forwarding (even if it wasn't a hideously bad idea, they don't
  86  * have the select() infrastructure to make them work).
  87  */
  88 int cmdline_tooltype = 0;
  89
  90 static int cmdline_check_unavailable(int flag, char *p)
  91 {
  92     if (cmdline_tooltype & flag) {
  93         cmdline_error("option \"%s\" not available in this tool", p);
  94         return 1;
  95     }
  96     return 0;
  97 }
  98
  99 #define UNAVAILABLE_IN(flag) do { \
 100     if (cmdline_check_unavailable(flag, p)) return ret; \
 101 } while (0)
 102
 103 /*
 104  * Process a standard command-line parameter. `p' is the parameter
 105  * in question; `value' is the subsequent element of argv, which
 106  * may or may not be required as an operand to the parameter.
 107  * Return value is 2 if both arguments were used; 1 if only p was
 108  * used; 0 if the parameter wasn't one we recognised; -2 if it
 109  * should have been 2 but value was NULL.
 110  */
 111
 112 #define RETURN(x) do { \
 113     if ((x) == 2 && !value) return -2; \
 114     ret = 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);
 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);
 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);
 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);
 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         SAVEABLE(0);
 165         strncpy(cfg->username, value, sizeof(cfg->username));
 166         cfg->username[sizeof(cfg->username) - 1] = '\0';
 167     }
 168     if ((!strcmp(p, "-L") || !strcmp(p, "-R"))) {
 169         char *fwd, *ptr, *q, *qq;
 170         int i=0;
 171         RETURN(2);
 172         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER);
 173         SAVEABLE(0);
 174         fwd = value;
 175         ptr = cfg->portfwd;
 176         /* if multiple forwards, find end of list */
 177         if (ptr[0]=='R' || ptr[0]=='L') {
 178             for (i = 0; i < sizeof(cfg->portfwd) - 2; i++)
 179                 if (ptr[i]=='\000' && ptr[i+1]=='\000')
 180                     break;
 181             ptr = ptr + i + 1;  /* point to next forward slot */
 182         }
 183         ptr[0] = p[1];  /* insert a 'L' or 'R' at the start */
 184         if (strlen(fwd) > sizeof(cfg->portfwd) - i - 2) {
 185             cmdline_error("out of space for port forwardings");
 186             return ret;
 187         }
 188         strncpy(ptr+1, fwd, sizeof(cfg->portfwd) - i);
 189         /*
 190          * We expect _at least_ two colons in this string. The
 191          * possible formats are `sourceport:desthost:destport', or
 192          * `sourceip:sourceport:desthost:destport' if you're
 193          * specifying a particular loopback address. We need to
 194          * replace the one between source and dest with a \t; this
 195          * means we must find the second-to-last colon in the
 196          * string.
 197          */
 198         q = qq = strchr(ptr, ':');
 199         while (qq) {
 200             char *qqq = strchr(qq+1, ':');
 201             if (qqq)
 202                 q = qq;
 203             qq = qqq;
 204         }
 205         if (q) *q = '\t';              /* replace second-last colon with \t */
 206         cfg->portfwd[sizeof(cfg->portfwd) - 1] = '\0';
 207         cfg->portfwd[sizeof(cfg->portfwd) - 2] = '\0';
 208         ptr[strlen(ptr)+1] = '\000';    /* append two '\000' */
 209     }
 210     if (!strcmp(p, "-m")) {
 211         char *filename, *command;
 212         int cmdlen, cmdsize;
 213         FILE *fp;
 214         int c, d;
 215
 216         RETURN(2);
 217         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER);
 218         SAVEABLE(0);
 219
 220         filename = value;
 221
 222         cmdlen = cmdsize = 0;
 223         command = NULL;
 224         fp = fopen(filename, "r");
 225         if (!fp) {
 226             cmdline_error("unable to open command "
 227                           "file \"%s\"", filename);
 228             return ret;
 229         }
 230         do {
 231             c = fgetc(fp);
 232             d = c;
 233             if (c == EOF)
 234                 d = 0;
 235             if (cmdlen >= cmdsize) {
 236                 cmdsize = cmdlen + 512;
 237                 command = srealloc(command, cmdsize);
 238             }
 239             command[cmdlen++] = d;
 240         } while (c != EOF);
 241         cfg->remote_cmd_ptr = command;
 242         cfg->remote_cmd_ptr2 = NULL;
 243         cfg->nopty = TRUE;      /* command => no terminal */
 244     }
 245     if (!strcmp(p, "-P")) {
 246         RETURN(2);
 247         SAVEABLE(1);                   /* lower priority than -ssh,-telnet */
 248         cfg->port = atoi(value);
 249     }
 250     if (!strcmp(p, "-pw")) {
 251         RETURN(2);
 252         cmdline_password = value;
 253         ssh_get_line = cmdline_get_line;
 254         ssh_getline_pw_only = TRUE;
 255     }
 256
 257     if (!strcmp(p, "-A")) {
 258         RETURN(1);
 259         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER);
 260         SAVEABLE(0);
 261         cfg->agentfwd = 1;
 262     }
 263     if (!strcmp(p, "-a")) {
 264         RETURN(1);
 265         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER);
 266         SAVEABLE(0);
 267         cfg->agentfwd = 0;
 268     }
 269
 270     if (!strcmp(p, "-X")) {
 271         RETURN(1);
 272         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER);
 273         SAVEABLE(0);
 274         cfg->x11_forward = 1;
 275     }
 276     if (!strcmp(p, "-x")) {
 277         RETURN(1);
 278         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER);
 279         SAVEABLE(0);
 280         cfg->x11_forward = 0;
 281     }
 282
 283     if (!strcmp(p, "-t")) {
 284         RETURN(1);
 285         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER);
 286         SAVEABLE(0);
 287         cfg->nopty = 0;
 288     }
 289     if (!strcmp(p, "-T")) {
 290         RETURN(1);
 291         UNAVAILABLE_IN(TOOLTYPE_FILETRANSFER);
 292         SAVEABLE(0);
 293         cfg->nopty = 1;
 294     }
 295
 296     if (!strcmp(p, "-C")) {
 297         RETURN(1);
 298         SAVEABLE(0);
 299         cfg->compression = 1;
 300     }
 301
 302     if (!strcmp(p, "-1")) {
 303         RETURN(1);
 304         SAVEABLE(0);
 305         cfg->sshprot = 0;              /* ssh protocol 1 only */
 306     }
 307     if (!strcmp(p, "-2")) {
 308         RETURN(1);
 309         SAVEABLE(0);
 310         cfg->sshprot = 3;              /* ssh protocol 2 only */
 311     }
 312
 313     if (!strcmp(p, "-i")) {
 314         RETURN(2);
 315         SAVEABLE(0);
 316         cfg->keyfile = filename_from_str(value);
 317     }
 318
 319     return ret;                        /* unrecognised */
 320 }
 321
 322 void cmdline_run_saved(Config *cfg)
 323 {
 324     int pri, i;
 325     for (pri = 0; pri < NPRIORITIES; pri++)
 326         for (i = 0; i < saves[pri].nsaved; i++)
 327             cmdline_process_param(saves[pri].params[i].p,
 328                                   saves[pri].params[i].value, 0, cfg);
 329 }