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s3-docs: overrided -> overridden
[Samba.git] / source3 / lib / substitute.c
blob68328e566b0319776611a1196f191cc8d2cbbf4d
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 global_myname();
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 = NULL;
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 if (sub_peername != NULL &&
212 sub_peername != sub_peeraddr) {
213 free(discard_const_p(char,sub_peername));
214 sub_peername = NULL;
215 }
216 sub_peername = SMB_STRDUP(peername);
217 if (sub_peername == NULL) {
218 sub_peername = sub_peeraddr;
219 }
220
221 /*
222 * Shouldn't we do the ::ffff: cancellation here as well? The
223 * original code in alloc_sub_basic() did not do it, so I'm
224 * leaving it out here as well for compatibility.
225 */
226 strlcpy(sub_sockaddr, sockaddr, sizeof(sub_sockaddr));
227 }
228
229 static const char *get_smb_user_name(void)
230 {
231 return smb_user_name ? smb_user_name : "";
232 }
233
234 /*******************************************************************
235 Setup the strings used by substitutions. Called per packet. Ensure
236 %U name is set correctly also.
237
238 smb_name must be sanitized by alpha_strcpy
239 ********************************************************************/
240
241 void set_current_user_info(const char *smb_name, const char *unix_name,
242 const char *domain)
243 {
244 fstrcpy(current_user_info.smb_name, smb_name);
245 fstrcpy(current_user_info.unix_name, unix_name);
246 fstrcpy(current_user_info.domain, domain);
247
248 /* The following is safe as current_user_info.smb_name
249 * has already been sanitised in register_existing_vuid. */
250
251 sub_set_smb_name(current_user_info.smb_name);
252 }
253
254 /*******************************************************************
255 Return the current active user name.
256 *******************************************************************/
257
258 const char *get_current_username(void)
259 {
260 if (current_user_info.smb_name[0] == '\0' ) {
261 return get_smb_user_name();
262 }
263
264 return current_user_info.smb_name;
265 }
266
267 /*******************************************************************
268 Given a pointer to a %$(NAME) in p and the whole string in str
269 expand it as an environment variable.
270 Return a new allocated and expanded string.
271 Based on code by Branko Cibej <branko.cibej@hermes.si>
272 When this is called p points at the '%' character.
273 May substitute multiple occurrencies of the same env var.
274 ********************************************************************/
275
276 static char * realloc_expand_env_var(char *str, char *p)
277 {
278 char *envname;
279 char *envval;
280 char *q, *r;
281 int copylen;
282
283 if (p[0] != '%' || p[1] != '$' || p[2] != '(') {
284 return str;
285 }
286
287 /*
288 * Look for the terminating ')'.
289 */
290
291 if ((q = strchr_m(p,')')) == NULL) {
292 DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p));
293 return str;
294 }
295
296 /*
297 * Extract the name from within the %$(NAME) string.
298 */
299
300 r = p + 3;
301 copylen = q - r;
302
303 /* reserve space for use later add %$() chars */
304 if ( (envname = (char *)SMB_MALLOC(copylen + 1 + 4)) == NULL ) {
305 return NULL;
306 }
307
308 strncpy(envname,r,copylen);
309 envname[copylen] = '\0';
310
311 if ((envval = getenv(envname)) == NULL) {
312 DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname));
313 SAFE_FREE(envname);
314 return str;
315 }
316
317 /*
318 * Copy the full %$(NAME) into envname so it
319 * can be replaced.
320 */
321
322 copylen = q + 1 - p;
323 strncpy(envname,p,copylen);
324 envname[copylen] = '\0';
325 r = realloc_string_sub(str, envname, envval);
326 SAFE_FREE(envname);
327
328 return r;
329 }
330
331 /*******************************************************************
332 *******************************************************************/
333
334 static char *longvar_domainsid( void )
335 {
336 struct dom_sid sid;
337 fstring tmp;
338 char *sid_string;
339
340 if ( !secrets_fetch_domain_sid( lp_workgroup(), &sid ) ) {
341 return NULL;
342 }
343
344 sid_string = SMB_STRDUP( sid_to_fstring( tmp, &sid ) );
345
346 if ( !sid_string ) {
347 DEBUG(0,("longvar_domainsid: failed to dup SID string!\n"));
348 }
349
350 return sid_string;
351 }
352
353 /*******************************************************************
354 *******************************************************************/
355
356 struct api_longvar {
357 const char *name;
358 char* (*fn)( void );
359 };
360
361 static struct api_longvar longvar_table[] = {
362 { "DomainSID", longvar_domainsid },
363 { NULL, NULL }
364 };
365
366 static char *get_longvar_val( const char *varname )
367 {
368 int i;
369
370 DEBUG(7,("get_longvar_val: expanding variable [%s]\n", varname));
371
372 for ( i=0; longvar_table[i].name; i++ ) {
373 if ( strequal( longvar_table[i].name, varname ) ) {
374 return longvar_table[i].fn();
375 }
376 }
377
378 return NULL;
379 }
380
381 /*******************************************************************
382 Expand the long smb.conf variable names given a pointer to a %(NAME).
383 Return the number of characters by which the pointer should be advanced.
384 When this is called p points at the '%' character.
385 ********************************************************************/
386
387 static char *realloc_expand_longvar(char *str, char *p)
388 {
389 fstring varname;
390 char *value;
391 char *q, *r;
392 int copylen;
393
394 if ( p[0] != '%' || p[1] != '(' ) {
395 return str;
396 }
397
398 /* Look for the terminating ')'.*/
399
400 if ((q = strchr_m(p,')')) == NULL) {
401 DEBUG(0,("realloc_expand_longvar: Unterminated environment variable [%s]\n", p));
402 return str;
403 }
404
405 /* Extract the name from within the %(NAME) string.*/
406
407 r = p+2;
408 copylen = MIN( (q-r), (sizeof(varname)-1) );
409 strncpy(varname, r, copylen);
410 varname[copylen] = '\0';
411
412 if ((value = get_longvar_val(varname)) == NULL) {
413 DEBUG(0,("realloc_expand_longvar: Variable [%s] not set. Skipping\n", varname));
414 return str;
415 }
416
417 /* Copy the full %(NAME) into envname so it can be replaced.*/
418
419 copylen = MIN( (q+1-p),(sizeof(varname)-1) );
420 strncpy( varname, p, copylen );
421 varname[copylen] = '\0';
422 r = realloc_string_sub(str, varname, value);
423 SAFE_FREE( value );
424
425 /* skip over the %(varname) */
426
427 return r;
428 }
429
430 /*******************************************************************
431 Patch from jkf@soton.ac.uk
432 Added this to implement %p (NIS auto-map version of %H)
433 *******************************************************************/
434
435 static const char *automount_path(const char *user_name)
436 {
437 TALLOC_CTX *ctx = talloc_tos();
438 const char *server_path;
439
440 /* use the passwd entry as the default */
441 /* this will be the default if WITH_AUTOMOUNT is not used or fails */
442
443 server_path = talloc_strdup(ctx, get_user_home_dir(ctx, user_name));
444 if (!server_path) {
445 return "";
446 }
447
448 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
449
450 if (lp_nis_home_map()) {
451 const char *home_path_start;
452 char *automount_value = automount_lookup(ctx, user_name);
453
454 if(automount_value && strlen(automount_value) > 0) {
455 home_path_start = strchr_m(automount_value,':');
456 if (home_path_start != NULL) {
457 DEBUG(5, ("NIS lookup succeeded. "
458 "Home path is: %s\n",
459 home_path_start ?
460 (home_path_start+1):""));
461 server_path = talloc_strdup(ctx,
462 home_path_start+1);
463 if (!server_path) {
464 server_path = "";
465 }
466 }
467 } else {
468 /* NIS key lookup failed: default to
469 * user home directory from password file */
470 DEBUG(5, ("NIS lookup failed. Using Home path from "
471 "passwd file. Home path is: %s\n", server_path ));
472 }
473 }
474 #endif
475
476 DEBUG(4,("Home server path: %s\n", server_path));
477 return server_path;
478 }
479
480 /*******************************************************************
481 Patch from jkf@soton.ac.uk
482 This is Luke's original function with the NIS lookup code
483 moved out to a separate function.
484 *******************************************************************/
485
486 static const char *automount_server(const char *user_name)
487 {
488 TALLOC_CTX *ctx = talloc_tos();
489 const char *server_name;
490 const char *local_machine_name = get_local_machine_name();
491
492 /* use the local machine name as the default */
493 /* this will be the default if WITH_AUTOMOUNT is not used or fails */
494 if (local_machine_name && *local_machine_name) {
495 server_name = talloc_strdup(ctx, local_machine_name);
496 } else {
497 server_name = talloc_strdup(ctx, global_myname());
498 }
499
500 if (!server_name) {
501 return "";
502 }
503
504 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
505 if (lp_nis_home_map()) {
506 char *p;
507 char *srv;
508 char *automount_value = automount_lookup(ctx, user_name);
509 if (!automount_value) {
510 return "";
511 }
512 srv = talloc_strdup(ctx, automount_value);
513 if (!srv) {
514 return "";
515 }
516 p = strchr_m(srv, ':');
517 if (!p) {
518 return "";
519 }
520 *p = '\0';
521 server_name = srv;
522 DEBUG(5, ("NIS lookup succeeded. Home server %s\n",
523 server_name));
524 }
525 #endif
526
527 DEBUG(4,("Home server: %s\n", server_name));
528 return server_name;
529 }
530
531 /****************************************************************************
532 Do some standard substitutions in a string.
533 len is the length in bytes of the space allowed in string str. If zero means
534 don't allow expansions.
535 ****************************************************************************/
536
537 void standard_sub_basic(const char *smb_name, const char *domain_name,
538 char *str, size_t len)
539 {
540 char *s;
541
542 if ( (s = alloc_sub_basic( smb_name, domain_name, str )) != NULL ) {
543 strncpy( str, s, len );
544 }
545
546 SAFE_FREE( s );
547 }
548
549 /****************************************************************************
550 Do some standard substitutions in a string.
551 This function will return an allocated string that have to be freed.
552 ****************************************************************************/
553
554 char *talloc_sub_basic(TALLOC_CTX *mem_ctx, const char *smb_name,
555 const char *domain_name, const char *str)
556 {
557 char *a, *t;
558
559 if ( (a = alloc_sub_basic(smb_name, domain_name, str)) == NULL ) {
560 return NULL;
561 }
562 t = talloc_strdup(mem_ctx, a);
563 SAFE_FREE(a);
564 return t;
565 }
566
567 /****************************************************************************
568 ****************************************************************************/
569
570 static char *alloc_sub_basic(const char *smb_name, const char *domain_name,
571 const char *str)
572 {
573 char *b, *p, *s, *r, *a_string;
574 fstring pidstr, vnnstr;
575 const char *local_machine_name = get_local_machine_name();
576 TALLOC_CTX *tmp_ctx = NULL;
577
578 /* workaround to prevent a crash while looking at bug #687 */
579
580 if (!str) {
581 DEBUG(0,("alloc_sub_basic: NULL source string! This should not happen\n"));
582 return NULL;
583 }
584
585 a_string = SMB_STRDUP(str);
586 if (a_string == NULL) {
587 DEBUG(0, ("alloc_sub_basic: Out of memory!\n"));
588 return NULL;
589 }
590
591 tmp_ctx = talloc_stackframe();
592
593 for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
594
595 r = NULL;
596 b = a_string;
597
598 switch (*(p+1)) {
599 case 'U' :
600 r = strlower_talloc(tmp_ctx, smb_name);
601 if (r == NULL) {
602 goto error;
603 }
604 a_string = realloc_string_sub(a_string, "%U", r);
605 break;
606 case 'G' : {
607 struct passwd *pass;
608 r = talloc_strdup(tmp_ctx, smb_name);
609 if (r == NULL) {
610 goto error;
611 }
612 pass = Get_Pwnam_alloc(tmp_ctx, r);
613 if (pass != NULL) {
614 a_string = realloc_string_sub(
615 a_string, "%G",
616 gidtoname(pass->pw_gid));
617 }
618 TALLOC_FREE(pass);
619 break;
620 }
621 case 'D' :
622 r = strupper_talloc(tmp_ctx, domain_name);
623 if (r == NULL) {
624 goto error;
625 }
626 a_string = realloc_string_sub(a_string, "%D", r);
627 break;
628 case 'I' : {
629 a_string = realloc_string_sub(
630 a_string, "%I",
631 sub_peeraddr[0] ? sub_peeraddr : "0.0.0.0");
632 break;
633 }
634 case 'i':
635 a_string = realloc_string_sub(
636 a_string, "%i",
637 sub_sockaddr[0] ? sub_sockaddr : "0.0.0.0");
638 break;
639 case 'L' :
640 if ( StrnCaseCmp(p, "%LOGONSERVER%", strlen("%LOGONSERVER%")) == 0 ) {
641 break;
642 }
643 if (local_machine_name && *local_machine_name) {
644 a_string = realloc_string_sub(a_string, "%L", local_machine_name);
645 } else {
646 a_string = realloc_string_sub(a_string, "%L", global_myname());
647 }
648 break;
649 case 'N':
650 a_string = realloc_string_sub(a_string, "%N", automount_server(smb_name));
651 break;
652 case 'M' :
653 a_string = realloc_string_sub(a_string, "%M",
654 sub_peername ? sub_peername : "");
655 break;
656 case 'R' :
657 a_string = realloc_string_sub(a_string, "%R", remote_proto);
658 break;
659 case 'T' :
660 a_string = realloc_string_sub(a_string, "%T", current_timestring(tmp_ctx, False));
661 break;
662 case 'a' :
663 a_string = realloc_string_sub(a_string, "%a",
664 get_remote_arch_str());
665 break;
666 case 'd' :
667 slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_getpid());
668 a_string = realloc_string_sub(a_string, "%d", pidstr);
669 break;
670 case 'h' :
671 a_string = realloc_string_sub(a_string, "%h", myhostname());
672 break;
673 case 'm' :
674 a_string = realloc_string_sub(a_string, "%m",
675 remote_machine
676 ? remote_machine
677 : "");
678 break;
679 case 'v' :
680 a_string = realloc_string_sub(a_string, "%v", samba_version_string());
681 break;
682 case 'w' :
683 a_string = realloc_string_sub(a_string, "%w", lp_winbind_separator());
684 break;
685 case '$' :
686 a_string = realloc_expand_env_var(a_string, p); /* Expand environment variables */
687 break;
688 case '(':
689 a_string = realloc_expand_longvar( a_string, p );
690 break;
691 case 'V' :
692 slprintf(vnnstr,sizeof(vnnstr)-1, "%u", get_my_vnn());
693 a_string = realloc_string_sub(a_string, "%V", vnnstr);
694 break;
695 default:
696 break;
697 }
698
699 p++;
700 TALLOC_FREE(r);
701
702 if (a_string == NULL) {
703 goto done;
704 }
705 }
706
707 goto done;
708
709 error:
710 SAFE_FREE(a_string);
711
712 done:
713 TALLOC_FREE(tmp_ctx);
714 return a_string;
715 }
716
717 /****************************************************************************
718 Do some specific substitutions in a string.
719 This function will return an allocated string that have to be freed.
720 ****************************************************************************/
721
722 char *talloc_sub_specified(TALLOC_CTX *mem_ctx,
723 const char *input_string,
724 const char *username,
725 const char *domain,
726 uid_t uid,
727 gid_t gid)
728 {
729 char *a_string;
730 char *ret_string = NULL;
731 char *b, *p, *s;
732 TALLOC_CTX *tmp_ctx;
733
734 if (!(tmp_ctx = talloc_new(mem_ctx))) {
735 DEBUG(0, ("talloc_new failed\n"));
736 return NULL;
737 }
738
739 a_string = talloc_strdup(tmp_ctx, input_string);
740 if (a_string == NULL) {
741 DEBUG(0, ("talloc_sub_specified: Out of memory!\n"));
742 goto done;
743 }
744
745 for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
746
747 b = a_string;
748
749 switch (*(p+1)) {
750 case 'U' :
751 a_string = talloc_string_sub(
752 tmp_ctx, a_string, "%U", username);
753 break;
754 case 'u' :
755 a_string = talloc_string_sub(
756 tmp_ctx, a_string, "%u", username);
757 break;
758 case 'G' :
759 if (gid != -1) {
760 a_string = talloc_string_sub(
761 tmp_ctx, a_string, "%G",
762 gidtoname(gid));
763 } else {
764 a_string = talloc_string_sub(
765 tmp_ctx, a_string,
766 "%G", "NO_GROUP");
767 }
768 break;
769 case 'g' :
770 if (gid != -1) {
771 a_string = talloc_string_sub(
772 tmp_ctx, a_string, "%g",
773 gidtoname(gid));
774 } else {
775 a_string = talloc_string_sub(
776 tmp_ctx, a_string, "%g", "NO_GROUP");
777 }
778 break;
779 case 'D' :
780 a_string = talloc_string_sub(tmp_ctx, a_string,
781 "%D", domain);
782 break;
783 case 'N' :
784 a_string = talloc_string_sub(
785 tmp_ctx, a_string, "%N",
786 automount_server(username));
787 break;
788 default:
789 break;
790 }
791
792 p++;
793 if (a_string == NULL) {
794 goto done;
795 }
796 }
797
798 /* Watch out, using "mem_ctx" here, so all intermediate stuff goes
799 * away with the TALLOC_FREE(tmp_ctx) further down. */
800
801 ret_string = talloc_sub_basic(mem_ctx, username, domain, a_string);
802
803 done:
804 TALLOC_FREE(tmp_ctx);
805 return ret_string;
806 }
807
808 /****************************************************************************
809 ****************************************************************************/
810
811 static char *alloc_sub_advanced(const char *servicename, const char *user,
812 const char *connectpath, gid_t gid,
813 const char *smb_name, const char *domain_name,
814 const char *str)
815 {
816 char *a_string, *ret_string;
817 char *b, *p, *s;
818
819 a_string = SMB_STRDUP(str);
820 if (a_string == NULL) {
821 DEBUG(0, ("alloc_sub_advanced: Out of memory!\n"));
822 return NULL;
823 }
824
825 for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
826
827 b = a_string;
828
829 switch (*(p+1)) {
830 case 'N' :
831 a_string = realloc_string_sub(a_string, "%N", automount_server(user));
832 break;
833 case 'H': {
834 char *h;
835 if ((h = get_user_home_dir(talloc_tos(), user)))
836 a_string = realloc_string_sub(a_string, "%H", h);
837 TALLOC_FREE(h);
838 break;
839 }
840 case 'P':
841 a_string = realloc_string_sub(a_string, "%P", connectpath);
842 break;
843 case 'S':
844 a_string = realloc_string_sub(a_string, "%S", servicename);
845 break;
846 case 'g':
847 a_string = realloc_string_sub(a_string, "%g", gidtoname(gid));
848 break;
849 case 'u':
850 a_string = realloc_string_sub(a_string, "%u", user);
851 break;
852
853 /* Patch from jkf@soton.ac.uk Left the %N (NIS
854 * server name) in standard_sub_basic as it is
855 * a feature for logon servers, hence uses the
856 * username. The %p (NIS server path) code is
857 * here as it is used instead of the default
858 * "path =" string in [homes] and so needs the
859 * service name, not the username. */
860 case 'p':
861 a_string = realloc_string_sub(a_string, "%p",
862 automount_path(servicename));
863 break;
864
865 default:
866 break;
867 }
868
869 p++;
870 if (a_string == NULL) {
871 return NULL;
872 }
873 }
874
875 ret_string = alloc_sub_basic(smb_name, domain_name, a_string);
876 SAFE_FREE(a_string);
877 return ret_string;
878 }
879
880 /*
881 * This obviously is inefficient and needs to be merged into
882 * alloc_sub_advanced...
883 */
884
885 char *talloc_sub_advanced(TALLOC_CTX *mem_ctx,
886 const char *servicename, const char *user,
887 const char *connectpath, gid_t gid,
888 const char *smb_name, const char *domain_name,
889 const char *str)
890 {
891 char *a, *t;
892
893 if (!(a = alloc_sub_advanced(servicename, user, connectpath, gid,
894 smb_name, domain_name, str))) {
895 return NULL;
896 }
897 t = talloc_strdup(mem_ctx, a);
898 SAFE_FREE(a);
899 return t;
900 }
901
902
903 void standard_sub_advanced(const char *servicename, const char *user,
904 const char *connectpath, gid_t gid,
905 const char *smb_name, const char *domain_name,
906 char *str, size_t len)
907 {
908 char *s;
909
910 s = alloc_sub_advanced(servicename, user, connectpath,
911 gid, smb_name, domain_name, str);
912
913 if ( s ) {
914 strncpy( str, s, len );
915 SAFE_FREE( s );
916 }
917 }
918
919 /****************************************************************************
920 Do some standard substitutions in a string.
921 ****************************************************************************/
922
923 char *standard_sub_conn(TALLOC_CTX *ctx, connection_struct *conn, const char *str)
924 {
925 return talloc_sub_advanced(ctx,
926 lp_servicename(SNUM(conn)),
927 conn->session_info->unix_name,
928 conn->connectpath,
929 conn->session_info->utok.gid,
930 get_smb_user_name(),
931 "",
932 str);
933 }
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