source3/lib/substitute.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    string substitution functions
   4    Copyright (C) Andrew Tridgell 1992-2000
   5    Copyright (C) Gerald Carter   2006
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21
  22 #include "includes.h"
  23 #include "system/passwd.h"
  24 #include "secrets.h"
  25 #include "auth.h"
  26
  27 static char *alloc_sub_basic(const char *smb_name, const char *domain_name,
  28                              const char *str);
  29
  30 userdom_struct current_user_info;
  31 fstring remote_proto="UNKNOWN";
  32
  33 /**
  34  * Set the 'local' machine name
  35  * @param local_name the name we are being called
  36  * @param if this is the 'final' name for us, not be be changed again
  37  */
  38
  39 static char *local_machine;
  40
  41 void free_local_machine_name(void)
  42 {
  43         SAFE_FREE(local_machine);
  44 }
  45
  46 bool set_local_machine_name(const char *local_name, bool perm)
  47 {
  48         static bool already_perm = false;
  49         char *tmp_local_machine = NULL;
  50         size_t len;
  51
  52         if (already_perm) {
  53                 return true;
  54         }
  55
  56         tmp_local_machine = SMB_STRDUP(local_name);
  57         if (!tmp_local_machine) {
  58                 return false;
  59         }
  60         trim_char(tmp_local_machine,' ',' ');
  61
  62         SAFE_FREE(local_machine);
  63         len = strlen(tmp_local_machine);
  64         local_machine = SMB_CALLOC_ARRAY(char, len+1);
  65         if (!local_machine) {
  66                 SAFE_FREE(tmp_local_machine);
  67                 return false;
  68         }
  69         /* alpha_strcpy includes the space for the terminating nul. */
  70         alpha_strcpy(local_machine,tmp_local_machine,
  71                         SAFE_NETBIOS_CHARS,len+1);
  72         strlower_m(local_machine);
  73         SAFE_FREE(tmp_local_machine);
  74
  75         already_perm = perm;
  76
  77         return true;
  78 }
  79
  80 const char *get_local_machine_name(void)
  81 {
  82         if (!local_machine || !*local_machine) {
  83                 return lp_netbios_name();
  84         }
  85
  86         return local_machine;
  87 }
  88
  89 /**
  90  * Set the 'remote' machine name
  91  * @param remote_name the name our client wants to be called by
  92  * @param if this is the 'final' name for them, not be be changed again
  93  */
  94
  95 static char *remote_machine;
  96
  97 bool set_remote_machine_name(const char *remote_name, bool perm)
  98 {
  99         static bool already_perm = False;
 100         char *tmp_remote_machine;
 101         size_t len;
 102
 103         if (already_perm) {
 104                 return true;
 105         }
 106
 107         tmp_remote_machine = SMB_STRDUP(remote_name);
 108         if (!tmp_remote_machine) {
 109                 return false;
 110         }
 111         trim_char(tmp_remote_machine,' ',' ');
 112
 113         SAFE_FREE(remote_machine);
 114         len = strlen(tmp_remote_machine);
 115         remote_machine = SMB_CALLOC_ARRAY(char, len+1);
 116         if (!remote_machine) {
 117                 SAFE_FREE(tmp_remote_machine);
 118                 return false;
 119         }
 120
 121         /* alpha_strcpy includes the space for the terminating nul. */
 122         alpha_strcpy(remote_machine,tmp_remote_machine,
 123                         SAFE_NETBIOS_CHARS,len+1);
 124         strlower_m(remote_machine);
 125         SAFE_FREE(tmp_remote_machine);
 126
 127         already_perm = perm;
 128
 129         return true;
 130 }
 131
 132 const char *get_remote_machine_name(void)
 133 {
 134         return remote_machine ? remote_machine : "";
 135 }
 136
 137 /*******************************************************************
 138  Setup the string used by %U substitution.
 139 ********************************************************************/
 140
 141 static char *smb_user_name;
 142
 143 void sub_set_smb_name(const char *name)
 144 {
 145         char *tmp;
 146         size_t len;
 147         bool is_machine_account = false;
 148
 149         /* don't let anonymous logins override the name */
 150         if (!name || !*name) {
 151                 return;
 152         }
 153
 154         tmp = SMB_STRDUP(name);
 155         if (!tmp) {
 156                 return;
 157         }
 158         trim_char(tmp, ' ', ' ');
 159         strlower_m(tmp);
 160
 161         len = strlen(tmp);
 162
 163         if (len == 0) {
 164                 SAFE_FREE(tmp);
 165                 return;
 166         }
 167
 168         /* long story but here goes....we have to allow usernames
 169            ending in '$' as they are valid machine account names.
 170            So check for a machine account and re-add the '$'
 171            at the end after the call to alpha_strcpy().   --jerry  */
 172
 173         if (tmp[len-1] == '$') {
 174                 is_machine_account = True;
 175         }
 176
 177         SAFE_FREE(smb_user_name);
 178         smb_user_name = SMB_CALLOC_ARRAY(char, len+1);
 179         if (!smb_user_name) {
 180                 SAFE_FREE(tmp);
 181                 return;
 182         }
 183
 184         /* alpha_strcpy includes the space for the terminating nul. */
 185         alpha_strcpy(smb_user_name, tmp,
 186                         SAFE_NETBIOS_CHARS,
 187                         len+1);
 188
 189         SAFE_FREE(tmp);
 190
 191         if (is_machine_account) {
 192                 len = strlen(smb_user_name);
 193                 smb_user_name[len-1] = '$';
 194         }
 195 }
 196
 197 static char sub_peeraddr[INET6_ADDRSTRLEN];
 198 static const char *sub_peername = "";
 199 static char sub_sockaddr[INET6_ADDRSTRLEN];
 200
 201 void sub_set_socket_ids(const char *peeraddr, const char *peername,
 202                         const char *sockaddr)
 203 {
 204         const char *addr = peeraddr;
 205
 206         if (strnequal(addr, "::ffff:", 7)) {
 207                 addr += 7;
 208         }
 209         strlcpy(sub_peeraddr, addr, sizeof(sub_peeraddr));
 210
 211         sub_peername = SMB_STRDUP(peername);
 212         if (sub_peername == NULL) {
 213                 sub_peername = sub_peeraddr;
 214         }
 215
 216         /*
 217          * Shouldn't we do the ::ffff: cancellation here as well? The
 218          * original code in alloc_sub_basic() did not do it, so I'm
 219          * leaving it out here as well for compatibility.
 220          */
 221         strlcpy(sub_sockaddr, sockaddr, sizeof(sub_sockaddr));
 222 }
 223
 224 static const char *get_smb_user_name(void)
 225 {
 226         return smb_user_name ? smb_user_name : "";
 227 }
 228
 229 /*******************************************************************
 230  Setup the strings used by substitutions. Called per packet. Ensure
 231  %U name is set correctly also.
 232
 233  smb_name must be sanitized by alpha_strcpy
 234 ********************************************************************/
 235
 236 void set_current_user_info(const char *smb_name, const char *unix_name,
 237                            const char *domain)
 238 {
 239         fstrcpy(current_user_info.smb_name, smb_name);
 240         fstrcpy(current_user_info.unix_name, unix_name);
 241         fstrcpy(current_user_info.domain, domain);
 242
 243         /* The following is safe as current_user_info.smb_name
 244          * has already been sanitised in register_existing_vuid. */
 245
 246         sub_set_smb_name(current_user_info.smb_name);
 247 }
 248
 249 /*******************************************************************
 250  Return the current active user name.
 251 *******************************************************************/
 252
 253 const char *get_current_username(void)
 254 {
 255         if (current_user_info.smb_name[0] == '\0' ) {
 256                 return get_smb_user_name();
 257         }
 258
 259         return current_user_info.smb_name;
 260 }
 261
 262 /*******************************************************************
 263  Given a pointer to a %$(NAME) in p and the whole string in str
 264  expand it as an environment variable.
 265  Return a new allocated and expanded string.
 266  Based on code by Branko Cibej <branko.cibej@hermes.si>
 267  When this is called p points at the '%' character.
 268  May substitute multiple occurrencies of the same env var.
 269 ********************************************************************/
 270
 271 static char * realloc_expand_env_var(char *str, char *p)
 272 {
 273         char *envname;
 274         char *envval;
 275         char *q, *r;
 276         int copylen;
 277
 278         if (p[0] != '%' || p[1] != '$' || p[2] != '(') {
 279                 return str;
 280         }
 281
 282         /*
 283          * Look for the terminating ')'.
 284          */
 285
 286         if ((q = strchr_m(p,')')) == NULL) {
 287                 DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p));
 288                 return str;
 289         }
 290
 291         /*
 292          * Extract the name from within the %$(NAME) string.
 293          */
 294
 295         r = p + 3;
 296         copylen = q - r;
 297
 298         /* reserve space for use later add %$() chars */
 299         if ( (envname = (char *)SMB_MALLOC(copylen + 1 + 4)) == NULL ) {
 300                 return NULL;
 301         }
 302
 303         strncpy(envname,r,copylen);
 304         envname[copylen] = '\0';
 305
 306         if ((envval = getenv(envname)) == NULL) {
 307                 DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname));
 308                 SAFE_FREE(envname);
 309                 return str;
 310         }
 311
 312         /*
 313          * Copy the full %$(NAME) into envname so it
 314          * can be replaced.
 315          */
 316
 317         copylen = q + 1 - p;
 318         strncpy(envname,p,copylen);
 319         envname[copylen] = '\0';
 320         r = realloc_string_sub(str, envname, envval);
 321         SAFE_FREE(envname);
 322
 323         return r;
 324 }
 325
 326 /*******************************************************************
 327  Patch from jkf@soton.ac.uk
 328  Added this to implement %p (NIS auto-map version of %H)
 329 *******************************************************************/
 330
 331 static const char *automount_path(const char *user_name)
 332 {
 333         TALLOC_CTX *ctx = talloc_tos();
 334         const char *server_path;
 335
 336         /* use the passwd entry as the default */
 337         /* this will be the default if WITH_AUTOMOUNT is not used or fails */
 338
 339         server_path = talloc_strdup(ctx, get_user_home_dir(ctx, user_name));
 340         if (!server_path) {
 341                 return "";
 342         }
 343
 344 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
 345
 346         if (lp_nis_home_map()) {
 347                 const char *home_path_start;
 348                 char *automount_value = automount_lookup(ctx, user_name);
 349
 350                 if(automount_value && strlen(automount_value) > 0) {
 351                         home_path_start = strchr_m(automount_value,':');
 352                         if (home_path_start != NULL) {
 353                                 DEBUG(5, ("NIS lookup succeeded. "
 354                                         "Home path is: %s\n",
 355                                         home_path_start ?
 356                                                 (home_path_start+1):""));
 357                                 server_path = talloc_strdup(ctx,
 358                                                         home_path_start+1);
 359                                 if (!server_path) {
 360                                         server_path = "";
 361                                 }
 362                         }
 363                 } else {
 364                         /* NIS key lookup failed: default to
 365                          * user home directory from password file */
 366                         DEBUG(5, ("NIS lookup failed. Using Home path from "
 367                         "passwd file. Home path is: %s\n", server_path ));
 368                 }
 369         }
 370 #endif
 371
 372         DEBUG(4,("Home server path: %s\n", server_path));
 373         return server_path;
 374 }
 375
 376 /*******************************************************************
 377  Patch from jkf@soton.ac.uk
 378  This is Luke's original function with the NIS lookup code
 379  moved out to a separate function.
 380 *******************************************************************/
 381
 382 static const char *automount_server(const char *user_name)
 383 {
 384         TALLOC_CTX *ctx = talloc_tos();
 385         const char *server_name;
 386         const char *local_machine_name = get_local_machine_name();
 387
 388         /* use the local machine name as the default */
 389         /* this will be the default if WITH_AUTOMOUNT is not used or fails */
 390         if (local_machine_name && *local_machine_name) {
 391                 server_name = talloc_strdup(ctx, local_machine_name);
 392         } else {
 393                 server_name = talloc_strdup(ctx, lp_netbios_name());
 394         }
 395
 396         if (!server_name) {
 397                 return "";
 398         }
 399
 400 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
 401         if (lp_nis_home_map()) {
 402                 char *p;
 403                 char *srv;
 404                 char *automount_value = automount_lookup(ctx, user_name);
 405                 if (!automount_value) {
 406                         return "";
 407                 }
 408                 srv = talloc_strdup(ctx, automount_value);
 409                 if (!srv) {
 410                         return "";
 411                 }
 412                 p = strchr_m(srv, ':');
 413                 if (!p) {
 414                         return "";
 415                 }
 416                 *p = '\0';
 417                 server_name = srv;
 418                 DEBUG(5, ("NIS lookup succeeded.  Home server %s\n",
 419                                         server_name));
 420         }
 421 #endif
 422
 423         DEBUG(4,("Home server: %s\n", server_name));
 424         return server_name;
 425 }
 426
 427 /****************************************************************************
 428  Do some standard substitutions in a string.
 429  len is the length in bytes of the space allowed in string str. If zero means
 430  don't allow expansions.
 431 ****************************************************************************/
 432
 433 void standard_sub_basic(const char *smb_name, const char *domain_name,
 434                         char *str, size_t len)
 435 {
 436         char *s;
 437
 438         if ( (s = alloc_sub_basic( smb_name, domain_name, str )) != NULL ) {
 439                 strncpy( str, s, len );
 440         }
 441
 442         SAFE_FREE( s );
 443 }
 444
 445 /****************************************************************************
 446  Do some standard substitutions in a string.
 447  This function will return an allocated string that have to be freed.
 448 ****************************************************************************/
 449
 450 char *talloc_sub_basic(TALLOC_CTX *mem_ctx, const char *smb_name,
 451                        const char *domain_name, const char *str)
 452 {
 453         char *a, *t;
 454
 455         if ( (a = alloc_sub_basic(smb_name, domain_name, str)) == NULL ) {
 456                 return NULL;
 457         }
 458         t = talloc_strdup(mem_ctx, a);
 459         SAFE_FREE(a);
 460         return t;
 461 }
 462
 463 /****************************************************************************
 464 ****************************************************************************/
 465
 466 static char *alloc_sub_basic(const char *smb_name, const char *domain_name,
 467                              const char *str)
 468 {
 469         char *b, *p, *s, *r, *a_string;
 470         fstring pidstr, vnnstr;
 471         const char *local_machine_name = get_local_machine_name();
 472         TALLOC_CTX *tmp_ctx = NULL;
 473
 474         /* workaround to prevent a crash while looking at bug #687 */
 475
 476         if (!str) {
 477                 DEBUG(0,("alloc_sub_basic: NULL source string!  This should not happen\n"));
 478                 return NULL;
 479         }
 480
 481         a_string = SMB_STRDUP(str);
 482         if (a_string == NULL) {
 483                 DEBUG(0, ("alloc_sub_basic: Out of memory!\n"));
 484                 return NULL;
 485         }
 486
 487         tmp_ctx = talloc_stackframe();
 488
 489         for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
 490
 491                 r = NULL;
 492                 b = a_string;
 493
 494                 switch (*(p+1)) {
 495                 case 'U' :
 496                         r = strlower_talloc(tmp_ctx, smb_name);
 497                         if (r == NULL) {
 498                                 goto error;
 499                         }
 500                         a_string = realloc_string_sub(a_string, "%U", r);
 501                         break;
 502                 case 'G' : {
 503                         struct passwd *pass;
 504                         r = talloc_strdup(tmp_ctx, smb_name);
 505                         if (r == NULL) {
 506                                 goto error;
 507                         }
 508                         pass = Get_Pwnam_alloc(tmp_ctx, r);
 509                         if (pass != NULL) {
 510                                 a_string = realloc_string_sub(
 511                                         a_string, "%G",
 512                                         gidtoname(pass->pw_gid));
 513                         }
 514                         TALLOC_FREE(pass);
 515                         break;
 516                 }
 517                 case 'D' :
 518                         r = strupper_talloc(tmp_ctx, domain_name);
 519                         if (r == NULL) {
 520                                 goto error;
 521                         }
 522                         a_string = realloc_string_sub(a_string, "%D", r);
 523                         break;
 524                 case 'I' : {
 525                         a_string = realloc_string_sub(
 526                                 a_string, "%I",
 527                                 sub_peeraddr[0] ? sub_peeraddr : "0.0.0.0");
 528                         break;
 529                 }
 530                 case 'i':
 531                         a_string = realloc_string_sub(
 532                                 a_string, "%i",
 533                                 sub_sockaddr[0] ? sub_sockaddr : "0.0.0.0");
 534                         break;
 535                 case 'L' :
 536                         if ( strncasecmp_m(p, "%LOGONSERVER%", strlen("%LOGONSERVER%")) == 0 ) {
 537                                 break;
 538                         }
 539                         if (local_machine_name && *local_machine_name) {
 540                                 a_string = realloc_string_sub(a_string, "%L", local_machine_name);
 541                         } else {
 542                                 a_string = realloc_string_sub(a_string, "%L", lp_netbios_name());
 543                         }
 544                         break;
 545                 case 'N':
 546                         a_string = realloc_string_sub(a_string, "%N", automount_server(smb_name));
 547                         break;
 548                 case 'M' :
 549                         a_string = realloc_string_sub(a_string, "%M",
 550                                                       sub_peername);
 551                         break;
 552                 case 'R' :
 553                         a_string = realloc_string_sub(a_string, "%R", remote_proto);
 554                         break;
 555                 case 'T' :
 556                         a_string = realloc_string_sub(a_string, "%T", current_timestring(tmp_ctx, False));
 557                         break;
 558                 case 'a' :
 559                         a_string = realloc_string_sub(a_string, "%a",
 560                                         get_remote_arch_str());
 561                         break;
 562                 case 'd' :
 563                         slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_getpid());
 564                         a_string = realloc_string_sub(a_string, "%d", pidstr);
 565                         break;
 566                 case 'h' :
 567                         a_string = realloc_string_sub(a_string, "%h", myhostname());
 568                         break;
 569                 case 'm' :
 570                         a_string = realloc_string_sub(a_string, "%m",
 571                                                       remote_machine
 572                                                       ? remote_machine
 573                                                       : "");
 574                         break;
 575                 case 'v' :
 576                         a_string = realloc_string_sub(a_string, "%v", samba_version_string());
 577                         break;
 578                 case 'w' :
 579                         a_string = realloc_string_sub(a_string, "%w", lp_winbind_separator());
 580                         break;
 581                 case '$' :
 582                         a_string = realloc_expand_env_var(a_string, p); /* Expand environment variables */
 583                         break;
 584                 case 'V' :
 585                         slprintf(vnnstr,sizeof(vnnstr)-1, "%u", get_my_vnn());
 586                         a_string = realloc_string_sub(a_string, "%V", vnnstr);
 587                         break;
 588                 default:
 589                         break;
 590                 }
 591
 592                 p++;
 593                 TALLOC_FREE(r);
 594
 595                 if (a_string == NULL) {
 596                         goto done;
 597                 }
 598         }
 599
 600         goto done;
 601
 602 error:
 603         SAFE_FREE(a_string);
 604
 605 done:
 606         TALLOC_FREE(tmp_ctx);
 607         return a_string;
 608 }
 609
 610 /****************************************************************************
 611  Do some specific substitutions in a string.
 612  This function will return an allocated string that have to be freed.
 613 ****************************************************************************/
 614
 615 char *talloc_sub_specified(TALLOC_CTX *mem_ctx,
 616                         const char *input_string,
 617                         const char *username,
 618                         const char *domain,
 619                         uid_t uid,
 620                         gid_t gid)
 621 {
 622         char *a_string;
 623         char *ret_string = NULL;
 624         char *b, *p, *s;
 625         TALLOC_CTX *tmp_ctx;
 626
 627         if (!(tmp_ctx = talloc_new(mem_ctx))) {
 628                 DEBUG(0, ("talloc_new failed\n"));
 629                 return NULL;
 630         }
 631
 632         a_string = talloc_strdup(tmp_ctx, input_string);
 633         if (a_string == NULL) {
 634                 DEBUG(0, ("talloc_sub_specified: Out of memory!\n"));
 635                 goto done;
 636         }
 637
 638         for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
 639
 640                 b = a_string;
 641
 642                 switch (*(p+1)) {
 643                 case 'U' :
 644                         a_string = talloc_string_sub(
 645                                 tmp_ctx, a_string, "%U", username);
 646                         break;
 647                 case 'u' :
 648                         a_string = talloc_string_sub(
 649                                 tmp_ctx, a_string, "%u", username);
 650                         break;
 651                 case 'G' :
 652                         if (gid != -1) {
 653                                 a_string = talloc_string_sub(
 654                                         tmp_ctx, a_string, "%G",
 655                                         gidtoname(gid));
 656                         } else {
 657                                 a_string = talloc_string_sub(
 658                                         tmp_ctx, a_string,
 659                                         "%G", "NO_GROUP");
 660                         }
 661                         break;
 662                 case 'g' :
 663                         if (gid != -1) {
 664                                 a_string = talloc_string_sub(
 665                                         tmp_ctx, a_string, "%g",
 666                                         gidtoname(gid));
 667                         } else {
 668                                 a_string = talloc_string_sub(
 669                                         tmp_ctx, a_string, "%g", "NO_GROUP");
 670                         }
 671                         break;
 672                 case 'D' :
 673                         a_string = talloc_string_sub(tmp_ctx, a_string,
 674                                                      "%D", domain);
 675                         break;
 676                 case 'N' :
 677                         a_string = talloc_string_sub(
 678                                 tmp_ctx, a_string, "%N",
 679                                 automount_server(username));
 680                         break;
 681                 default:
 682                         break;
 683                 }
 684
 685                 p++;
 686                 if (a_string == NULL) {
 687                         goto done;
 688                 }
 689         }
 690
 691         /* Watch out, using "mem_ctx" here, so all intermediate stuff goes
 692          * away with the TALLOC_FREE(tmp_ctx) further down. */
 693
 694         ret_string = talloc_sub_basic(mem_ctx, username, domain, a_string);
 695
 696  done:
 697         TALLOC_FREE(tmp_ctx);
 698         return ret_string;
 699 }
 700
 701 /****************************************************************************
 702 ****************************************************************************/
 703
 704 static char *alloc_sub_advanced(const char *servicename, const char *user,
 705                          const char *connectpath, gid_t gid,
 706                          const char *smb_name, const char *domain_name,
 707                          const char *str)
 708 {
 709         char *a_string, *ret_string;
 710         char *b, *p, *s;
 711
 712         a_string = SMB_STRDUP(str);
 713         if (a_string == NULL) {
 714                 DEBUG(0, ("alloc_sub_advanced: Out of memory!\n"));
 715                 return NULL;
 716         }
 717
 718         for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
 719
 720                 b = a_string;
 721
 722                 switch (*(p+1)) {
 723                 case 'N' :
 724                         a_string = realloc_string_sub(a_string, "%N", automount_server(user));
 725                         break;
 726                 case 'H': {
 727                         char *h;
 728                         if ((h = get_user_home_dir(talloc_tos(), user)))
 729                                 a_string = realloc_string_sub(a_string, "%H", h);
 730                         TALLOC_FREE(h);
 731                         break;
 732                 }
 733                 case 'P':
 734                         a_string = realloc_string_sub(a_string, "%P", connectpath);
 735                         break;
 736                 case 'S':
 737                         a_string = realloc_string_sub(a_string, "%S", servicename);
 738                         break;
 739                 case 'g':
 740                         a_string = realloc_string_sub(a_string, "%g", gidtoname(gid));
 741                         break;
 742                 case 'u':
 743                         a_string = realloc_string_sub(a_string, "%u", user);
 744                         break;
 745
 746                         /* Patch from jkf@soton.ac.uk Left the %N (NIS
 747                          * server name) in standard_sub_basic as it is
 748                          * a feature for logon servers, hence uses the
 749                          * username.  The %p (NIS server path) code is
 750                          * here as it is used instead of the default
 751                          * "path =" string in [homes] and so needs the
 752                          * service name, not the username.  */
 753                 case 'p':
 754                         a_string = realloc_string_sub(a_string, "%p",
 755                                                       automount_path(servicename));
 756                         break;
 757
 758                 default:
 759                         break;
 760                 }
 761
 762                 p++;
 763                 if (a_string == NULL) {
 764                         return NULL;
 765                 }
 766         }
 767
 768         ret_string = alloc_sub_basic(smb_name, domain_name, a_string);
 769         SAFE_FREE(a_string);
 770         return ret_string;
 771 }
 772
 773 /*
 774  * This obviously is inefficient and needs to be merged into
 775  * alloc_sub_advanced...
 776  */
 777
 778 char *talloc_sub_advanced(TALLOC_CTX *mem_ctx,
 779                           const char *servicename, const char *user,
 780                           const char *connectpath, gid_t gid,
 781                           const char *smb_name, const char *domain_name,
 782                           const char *str)
 783 {
 784         char *a, *t;
 785
 786         if (!(a = alloc_sub_advanced(servicename, user, connectpath, gid,
 787                                      smb_name, domain_name, str))) {
 788                 return NULL;
 789         }
 790         t = talloc_strdup(mem_ctx, a);
 791         SAFE_FREE(a);
 792         return t;
 793 }
 794
 795
 796 void standard_sub_advanced(const char *servicename, const char *user,
 797                            const char *connectpath, gid_t gid,
 798                            const char *smb_name, const char *domain_name,
 799                            char *str, size_t len)
 800 {
 801         char *s;
 802
 803         s = alloc_sub_advanced(servicename, user, connectpath,
 804                                gid, smb_name, domain_name, str);
 805
 806         if ( s ) {
 807                 strncpy( str, s, len );
 808                 SAFE_FREE( s );
 809         }
 810 }
 811
 812 /****************************************************************************
 813  Do some standard substitutions in a string.
 814 ****************************************************************************/
 815
 816 char *standard_sub_conn(TALLOC_CTX *ctx, connection_struct *conn, const char *str)
 817 {
 818         /* Make clear that we require the optional unix_token and unix_info in the source3 code */
 819         SMB_ASSERT(conn->session_info->unix_token);
 820         SMB_ASSERT(conn->session_info->unix_info);
 821         return talloc_sub_advanced(ctx,
 822                                 lp_servicename(SNUM(conn)),
 823                                 conn->session_info->unix_info->unix_name,
 824                                 conn->connectpath,
 825                                 conn->session_info->unix_token->gid,
 826                                 get_smb_user_name(),
 827                                 "",
 828                                 str);
 829 }
 830
 831 /******************************************************************************
 832  version of standard_sub_basic() for string lists; uses talloc_sub_basic()
 833  for the work
 834  *****************************************************************************/
 835
 836 bool str_list_sub_basic( char **list, const char *smb_name,
 837                          const char *domain_name )
 838 {
 839         TALLOC_CTX *ctx = list;
 840         char *s, *tmpstr;
 841
 842         while ( *list ) {
 843                 s = *list;
 844                 tmpstr = talloc_sub_basic(ctx, smb_name, domain_name, s);
 845                 if ( !tmpstr ) {
 846                         DEBUG(0,("str_list_sub_basic: "
 847                                 "alloc_sub_basic() return NULL!\n"));
 848                         return false;
 849                 }
 850
 851                 TALLOC_FREE(*list);
 852                 *list = tmpstr;
 853
 854                 list++;
 855         }
 856
 857         return true;
 858 }