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Fix Bug 4240. Thanks to Karolin <ks@sernet.de> for bugging :-)
[Samba.git] / source / lib / substitute.c
blob62dfdb56b56c3d4829decd223c493081ec3a68db
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
24 extern struct current_user current_user;
25
26 userdom_struct current_user_info;
27 fstring remote_proto="UNKNOWN";
28
29 /**
30 * Set the 'local' machine name
31 * @param local_name the name we are being called
32 * @param if this is the 'final' name for us, not be be changed again
33 */
34
35 static char *local_machine;
36
37 void free_local_machine_name(void)
38 {
39 SAFE_FREE(local_machine);
40 }
41
42 bool set_local_machine_name(const char *local_name, bool perm)
43 {
44 static bool already_perm = false;
45 char *tmp_local_machine = NULL;
46 char addr[INET6_ADDRSTRLEN];
47 size_t len;
48
49 tmp_local_machine = SMB_STRDUP(local_name);
50 if (!tmp_local_machine) {
51 return false;
52 }
53 trim_char(tmp_local_machine,' ',' ');
54
55 /*
56 * Windows NT/2k uses "*SMBSERVER" and XP uses "*SMBSERV"
57 * arrggg!!!
58 */
59
60 if (strequal(tmp_local_machine, "*SMBSERVER") ||
61 strequal(tmp_local_machine, "*SMBSERV") ) {
62 SAFE_FREE(local_machine);
63 local_machine = SMB_STRDUP(client_socket_addr(get_client_fd(),
64 addr, sizeof(addr)) );
65 SAFE_FREE(tmp_local_machine);
66 return local_machine ? true : false;
67 }
68
69 if (already_perm) {
70 return true;
71 }
72
73 SAFE_FREE(local_machine);
74 len = strlen(tmp_local_machine);
75 local_machine = SMB_CALLOC_ARRAY(char, len+1);
76 if (!local_machine) {
77 SAFE_FREE(tmp_local_machine);
78 return false;
79 }
80 /* alpha_strcpy includes the space for the terminating nul. */
81 alpha_strcpy(local_machine,tmp_local_machine,
82 SAFE_NETBIOS_CHARS,len+1);
83 strlower_m(local_machine);
84 SAFE_FREE(tmp_local_machine);
85
86 already_perm = perm;
87
88 return true;
89 }
90
91 const char *get_local_machine_name(void)
92 {
93 if (!local_machine || !*local_machine) {
94 return global_myname();
95 }
96
97 return local_machine;
98 }
99
100 /**
101 * Set the 'remote' machine name
102 * @param remote_name the name our client wants to be called by
103 * @param if this is the 'final' name for them, not be be changed again
104 */
105
106 static char *remote_machine;
107
108 bool set_remote_machine_name(const char *remote_name, bool perm)
109 {
110 static bool already_perm = False;
111 char *tmp_remote_machine;
112 size_t len;
113
114 if (already_perm) {
115 return true;
116 }
117
118 tmp_remote_machine = SMB_STRDUP(remote_name);
119 if (!tmp_remote_machine) {
120 return false;
121 }
122 trim_char(tmp_remote_machine,' ',' ');
123
124 SAFE_FREE(remote_machine);
125 len = strlen(tmp_remote_machine);
126 remote_machine = SMB_CALLOC_ARRAY(char, len+1);
127 if (!remote_machine) {
128 SAFE_FREE(tmp_remote_machine);
129 return false;
130 }
131
132 /* alpha_strcpy includes the space for the terminating nul. */
133 alpha_strcpy(remote_machine,tmp_remote_machine,
134 SAFE_NETBIOS_CHARS,len+1);
135 strlower_m(remote_machine);
136 SAFE_FREE(tmp_remote_machine);
137
138 already_perm = perm;
139
140 return true;
141 }
142
143 const char *get_remote_machine_name(void)
144 {
145 return remote_machine ? remote_machine : "";
146 }
147
148 /*******************************************************************
149 Setup the string used by %U substitution.
150 ********************************************************************/
151
152 static char *smb_user_name;
153
154 void sub_set_smb_name(const char *name)
155 {
156 char *tmp;
157 size_t len;
158 bool is_machine_account = false;
159
160 /* don't let anonymous logins override the name */
161 if (!name || !*name) {
162 return;
163 }
164
165 tmp = SMB_STRDUP(name);
166 if (!tmp) {
167 return;
168 }
169 trim_char(tmp, ' ', ' ');
170 strlower_m(tmp);
171
172 len = strlen(tmp);
173
174 if (len == 0) {
175 SAFE_FREE(tmp);
176 return;
177 }
178
179 /* long story but here goes....we have to allow usernames
180 ending in '$' as they are valid machine account names.
181 So check for a machine account and re-add the '$'
182 at the end after the call to alpha_strcpy(). --jerry */
183
184 if (tmp[len-1] == '$') {
185 is_machine_account = True;
186 }
187
188 SAFE_FREE(smb_user_name);
189 smb_user_name = SMB_CALLOC_ARRAY(char, len+1);
190 if (!smb_user_name) {
191 SAFE_FREE(tmp);
192 return;
193 }
194
195 /* alpha_strcpy includes the space for the terminating nul. */
196 alpha_strcpy(smb_user_name, tmp,
197 SAFE_NETBIOS_CHARS,
198 len+1);
199
200 SAFE_FREE(tmp);
201
202 if (is_machine_account) {
203 len = strlen(smb_user_name);
204 smb_user_name[len-1] = '$';
205 }
206 }
207
208 static const char *get_smb_user_name(void)
209 {
210 return smb_user_name ? smb_user_name : "";
211 }
212
213 /*******************************************************************
214 Setup the strings used by substitutions. Called per packet. Ensure
215 %U name is set correctly also.
216 ********************************************************************/
217
218 void set_current_user_info(const userdom_struct *pcui)
219 {
220 current_user_info = *pcui;
221 /* The following is safe as current_user_info.smb_name
222 * has already been sanitised in register_existing_vuid. */
223
224 sub_set_smb_name(current_user_info.smb_name);
225 }
226
227 /*******************************************************************
228 Return the current active user name.
229 *******************************************************************/
230
231 const char *get_current_username(void)
232 {
233 if (current_user_info.smb_name[0] == '\0' ) {
234 return get_smb_user_name();
235 }
236
237 return current_user_info.smb_name;
238 }
239
240 /*******************************************************************
241 Given a pointer to a %$(NAME) in p and the whole string in str
242 expand it as an environment variable.
243 Return a new allocated and expanded string.
244 Based on code by Branko Cibej <branko.cibej@hermes.si>
245 When this is called p points at the '%' character.
246 May substitute multiple occurrencies of the same env var.
247 ********************************************************************/
248
249 static char * realloc_expand_env_var(char *str, char *p)
250 {
251 char *envname;
252 char *envval;
253 char *q, *r;
254 int copylen;
255
256 if (p[0] != '%' || p[1] != '$' || p[2] != '(') {
257 return str;
258 }
259
260 /*
261 * Look for the terminating ')'.
262 */
263
264 if ((q = strchr_m(p,')')) == NULL) {
265 DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p));
266 return str;
267 }
268
269 /*
270 * Extract the name from within the %$(NAME) string.
271 */
272
273 r = p + 3;
274 copylen = q - r;
275
276 /* reserve space for use later add %$() chars */
277 if ( (envname = (char *)SMB_MALLOC(copylen + 1 + 4)) == NULL ) {
278 return NULL;
279 }
280
281 strncpy(envname,r,copylen);
282 envname[copylen] = '\0';
283
284 if ((envval = getenv(envname)) == NULL) {
285 DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname));
286 SAFE_FREE(envname);
287 return str;
288 }
289
290 /*
291 * Copy the full %$(NAME) into envname so it
292 * can be replaced.
293 */
294
295 copylen = q + 1 - p;
296 strncpy(envname,p,copylen);
297 envname[copylen] = '\0';
298 r = realloc_string_sub(str, envname, envval);
299 SAFE_FREE(envname);
300
301 return r;
302 }
303
304 /*******************************************************************
305 *******************************************************************/
306
307 static char *longvar_domainsid( void )
308 {
309 DOM_SID sid;
310 fstring tmp;
311 char *sid_string;
312
313 if ( !secrets_fetch_domain_sid( lp_workgroup(), &sid ) ) {
314 return NULL;
315 }
316
317 sid_string = SMB_STRDUP( sid_to_fstring( tmp, &sid ) );
318
319 if ( !sid_string ) {
320 DEBUG(0,("longvar_domainsid: failed to dup SID string!\n"));
321 }
322
323 return sid_string;
324 }
325
326 /*******************************************************************
327 *******************************************************************/
328
329 struct api_longvar {
330 const char *name;
331 char* (*fn)( void );
332 };
333
334 static struct api_longvar longvar_table[] = {
335 { "DomainSID", longvar_domainsid },
336 { NULL, NULL }
337 };
338
339 static char *get_longvar_val( const char *varname )
340 {
341 int i;
342
343 DEBUG(7,("get_longvar_val: expanding variable [%s]\n", varname));
344
345 for ( i=0; longvar_table[i].name; i++ ) {
346 if ( strequal( longvar_table[i].name, varname ) ) {
347 return longvar_table[i].fn();
348 }
349 }
350
351 return NULL;
352 }
353
354 /*******************************************************************
355 Expand the long smb.conf variable names given a pointer to a %(NAME).
356 Return the number of characters by which the pointer should be advanced.
357 When this is called p points at the '%' character.
358 ********************************************************************/
359
360 static char *realloc_expand_longvar(char *str, char *p)
361 {
362 fstring varname;
363 char *value;
364 char *q, *r;
365 int copylen;
366
367 if ( p[0] != '%' || p[1] != '(' ) {
368 return str;
369 }
370
371 /* Look for the terminating ')'.*/
372
373 if ((q = strchr_m(p,')')) == NULL) {
374 DEBUG(0,("realloc_expand_longvar: Unterminated environment variable [%s]\n", p));
375 return str;
376 }
377
378 /* Extract the name from within the %(NAME) string.*/
379
380 r = p+2;
381 copylen = MIN( (q-r), (sizeof(varname)-1) );
382 strncpy(varname, r, copylen);
383 varname[copylen] = '\0';
384
385 if ((value = get_longvar_val(varname)) == NULL) {
386 DEBUG(0,("realloc_expand_longvar: Variable [%s] not set. Skipping\n", varname));
387 return str;
388 }
389
390 /* Copy the full %(NAME) into envname so it can be replaced.*/
391
392 copylen = MIN( (q+1-p),(sizeof(varname)-1) );
393 strncpy( varname, p, copylen );
394 varname[copylen] = '\0';
395 r = realloc_string_sub(str, varname, value);
396 SAFE_FREE( value );
397
398 /* skip over the %(varname) */
399
400 return r;
401 }
402
403 /*******************************************************************
404 Patch from jkf@soton.ac.uk
405 Added this to implement %p (NIS auto-map version of %H)
406 *******************************************************************/
407
408 static const char *automount_path(const char *user_name)
409 {
410 TALLOC_CTX *ctx = talloc_tos();
411 const char *server_path;
412
413 /* use the passwd entry as the default */
414 /* this will be the default if WITH_AUTOMOUNT is not used or fails */
415
416 server_path = talloc_strdup(ctx, get_user_home_dir(ctx, user_name));
417 if (!server_path) {
418 return "";
419 }
420
421 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
422
423 if (lp_nis_home_map()) {
424 const char *home_path_start;
425 char *automount_value = automount_lookup(ctx, user_name);
426
427 if(automount_value && strlen(automount_value) > 0) {
428 home_path_start = strchr_m(automount_value,':');
429 if (home_path_start != NULL) {
430 DEBUG(5, ("NIS lookup succeeded. "
431 "Home path is: %s\n",
432 home_path_start ?
433 (home_path_start+1):""));
434 server_path = talloc_strdup(ctx,
435 home_path_start+1);
436 if (!server_path) {
437 server_path = "";
438 }
439 }
440 } else {
441 /* NIS key lookup failed: default to
442 * user home directory from password file */
443 DEBUG(5, ("NIS lookup failed. Using Home path from "
444 "passwd file. Home path is: %s\n", server_path ));
445 }
446 }
447 #endif
448
449 DEBUG(4,("Home server path: %s\n", server_path));
450 return server_path;
451 }
452
453 /*******************************************************************
454 Patch from jkf@soton.ac.uk
455 This is Luke's original function with the NIS lookup code
456 moved out to a separate function.
457 *******************************************************************/
458
459 static const char *automount_server(const char *user_name)
460 {
461 TALLOC_CTX *ctx = talloc_tos();
462 const char *server_name;
463 const char *local_machine_name = get_local_machine_name();
464
465 /* use the local machine name as the default */
466 /* this will be the default if WITH_AUTOMOUNT is not used or fails */
467 if (local_machine_name && *local_machine_name) {
468 server_name = talloc_strdup(ctx, local_machine_name);
469 } else {
470 server_name = talloc_strdup(ctx, global_myname());
471 }
472
473 if (!server_name) {
474 return "";
475 }
476
477 #if (defined(HAVE_NETGROUP) && defined (WITH_AUTOMOUNT))
478 if (lp_nis_home_map()) {
479 char *p;
480 char *srv;
481 char *automount_value = automount_lookup(ctx, user_name);
482 if (!automount_value) {
483 return "";
484 }
485 srv = talloc_strdup(ctx, automount_value);
486 if (!srv) {
487 return "";
488 }
489 p = strchr_m(srv, ':');
490 if (!p) {
491 return "";
492 }
493 *p = '\0';
494 server_name = srv;
495 DEBUG(5, ("NIS lookup succeeded. Home server %s\n",
496 server_name));
497 }
498 #endif
499
500 DEBUG(4,("Home server: %s\n", server_name));
501 return server_name;
502 }
503
504 /****************************************************************************
505 Do some standard substitutions in a string.
506 len is the length in bytes of the space allowed in string str. If zero means
507 don't allow expansions.
508 ****************************************************************************/
509
510 void standard_sub_basic(const char *smb_name, const char *domain_name,
511 char *str, size_t len)
512 {
513 char *s;
514
515 if ( (s = alloc_sub_basic( smb_name, domain_name, str )) != NULL ) {
516 strncpy( str, s, len );
517 }
518
519 SAFE_FREE( s );
520
521 }
522
523 /****************************************************************************
524 Do some standard substitutions in a string.
525 This function will return an allocated string that have to be freed.
526 ****************************************************************************/
527
528 char *talloc_sub_basic(TALLOC_CTX *mem_ctx, const char *smb_name,
529 const char *domain_name, const char *str)
530 {
531 char *a, *t;
532
533 if ( (a = alloc_sub_basic(smb_name, domain_name, str)) == NULL ) {
534 return NULL;
535 }
536 t = talloc_strdup(mem_ctx, a);
537 SAFE_FREE(a);
538 return t;
539 }
540
541 /****************************************************************************
542 ****************************************************************************/
543
544 char *alloc_sub_basic(const char *smb_name, const char *domain_name,
545 const char *str)
546 {
547 char *b, *p, *s, *r, *a_string;
548 fstring pidstr, vnnstr;
549 char addr[INET6_ADDRSTRLEN];
550 const char *local_machine_name = get_local_machine_name();
551 TALLOC_CTX *tmp_ctx = NULL;
552
553 /* workaround to prevent a crash while looking at bug #687 */
554
555 if (!str) {
556 DEBUG(0,("alloc_sub_basic: NULL source string! This should not happen\n"));
557 return NULL;
558 }
559
560 a_string = SMB_STRDUP(str);
561 if (a_string == NULL) {
562 DEBUG(0, ("alloc_sub_basic: Out of memory!\n"));
563 return NULL;
564 }
565
566 tmp_ctx = talloc_stackframe();
567
568 for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
569
570 r = NULL;
571 b = a_string;
572
573 switch (*(p+1)) {
574 case 'U' :
575 r = strdup_lower(smb_name);
576 if (r == NULL) {
577 goto error;
578 }
579 a_string = realloc_string_sub(a_string, "%U", r);
580 break;
581 case 'G' : {
582 struct passwd *pass;
583 r = SMB_STRDUP(smb_name);
584 if (r == NULL) {
585 goto error;
586 }
587 pass = Get_Pwnam_alloc(tmp_ctx, r);
588 if (pass != NULL) {
589 a_string = realloc_string_sub(
590 a_string, "%G",
591 gidtoname(pass->pw_gid));
592 }
593 TALLOC_FREE(pass);
594 break;
595 }
596 case 'D' :
597 r = strdup_upper(domain_name);
598 if (r == NULL) {
599 goto error;
600 }
601 a_string = realloc_string_sub(a_string, "%D", r);
602 break;
603 case 'I' : {
604 int offset = 0;
605 client_addr(get_client_fd(), addr, sizeof(addr));
606 if (strnequal(addr,"::ffff:",7)) {
607 offset = 7;
608 }
609 a_string = realloc_string_sub(a_string, "%I",
610 addr + offset);
611 break;
612 }
613 case 'i':
614 a_string = realloc_string_sub( a_string, "%i",
615 client_socket_addr(get_client_fd(), addr, sizeof(addr)) );
616 break;
617 case 'L' :
618 if ( StrnCaseCmp(p, "%LOGONSERVER%", strlen("%LOGONSERVER%")) == 0 ) {
619 break;
620 }
621 if (local_machine_name && *local_machine_name) {
622 a_string = realloc_string_sub(a_string, "%L", local_machine_name);
623 } else {
624 a_string = realloc_string_sub(a_string, "%L", global_myname());
625 }
626 break;
627 case 'N':
628 a_string = realloc_string_sub(a_string, "%N", automount_server(smb_name));
629 break;
630 case 'M' :
631 a_string = realloc_string_sub(a_string, "%M", client_name(get_client_fd()));
632 break;
633 case 'R' :
634 a_string = realloc_string_sub(a_string, "%R", remote_proto);
635 break;
636 case 'T' :
637 a_string = realloc_string_sub(a_string, "%T", current_timestring(tmp_ctx, False));
638 break;
639 case 'a' :
640 a_string = realloc_string_sub(a_string, "%a",
641 get_remote_arch_str());
642 break;
643 case 'd' :
644 slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)sys_getpid());
645 a_string = realloc_string_sub(a_string, "%d", pidstr);
646 break;
647 case 'h' :
648 a_string = realloc_string_sub(a_string, "%h", myhostname());
649 break;
650 case 'm' :
651 a_string = realloc_string_sub(a_string, "%m", remote_machine);
652 break;
653 case 'v' :
654 a_string = realloc_string_sub(a_string, "%v", SAMBA_VERSION_STRING);
655 break;
656 case 'w' :
657 a_string = realloc_string_sub(a_string, "%w", lp_winbind_separator());
658 break;
659 case '$' :
660 a_string = realloc_expand_env_var(a_string, p); /* Expand environment variables */
661 break;
662 case '(':
663 a_string = realloc_expand_longvar( a_string, p );
664 break;
665 case 'V' :
666 slprintf(vnnstr,sizeof(vnnstr)-1, "%u", get_my_vnn());
667 a_string = realloc_string_sub(a_string, "%V", vnnstr);
668 break;
669 default:
670 break;
671 }
672
673 p++;
674 SAFE_FREE(r);
675
676 if (a_string == NULL) {
677 goto done;
678 }
679 }
680
681 goto done;
682
683 error:
684 SAFE_FREE(a_string);
685
686 done:
687 TALLOC_FREE(tmp_ctx);
688 return a_string;
689 }
690
691 /****************************************************************************
692 Do some specific substitutions in a string.
693 This function will return an allocated string that have to be freed.
694 ****************************************************************************/
695
696 char *talloc_sub_specified(TALLOC_CTX *mem_ctx,
697 const char *input_string,
698 const char *username,
699 const char *domain,
700 uid_t uid,
701 gid_t gid)
702 {
703 char *a_string;
704 char *ret_string = NULL;
705 char *b, *p, *s;
706 TALLOC_CTX *tmp_ctx;
707
708 if (!(tmp_ctx = talloc_new(mem_ctx))) {
709 DEBUG(0, ("talloc_new failed\n"));
710 return NULL;
711 }
712
713 a_string = talloc_strdup(tmp_ctx, input_string);
714 if (a_string == NULL) {
715 DEBUG(0, ("talloc_sub_specified: Out of memory!\n"));
716 goto done;
717 }
718
719 for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
720
721 b = a_string;
722
723 switch (*(p+1)) {
724 case 'U' :
725 a_string = talloc_string_sub(
726 tmp_ctx, a_string, "%U", username);
727 break;
728 case 'u' :
729 a_string = talloc_string_sub(
730 tmp_ctx, a_string, "%u", username);
731 break;
732 case 'G' :
733 if (gid != -1) {
734 a_string = talloc_string_sub(
735 tmp_ctx, a_string, "%G",
736 gidtoname(gid));
737 } else {
738 a_string = talloc_string_sub(
739 tmp_ctx, a_string,
740 "%G", "NO_GROUP");
741 }
742 break;
743 case 'g' :
744 if (gid != -1) {
745 a_string = talloc_string_sub(
746 tmp_ctx, a_string, "%g",
747 gidtoname(gid));
748 } else {
749 a_string = talloc_string_sub(
750 tmp_ctx, a_string, "%g", "NO_GROUP");
751 }
752 break;
753 case 'D' :
754 a_string = talloc_string_sub(tmp_ctx, a_string,
755 "%D", domain);
756 break;
757 case 'N' :
758 a_string = talloc_string_sub(
759 tmp_ctx, a_string, "%N",
760 automount_server(username));
761 break;
762 default:
763 break;
764 }
765
766 p++;
767 if (a_string == NULL) {
768 goto done;
769 }
770 }
771
772 /* Watch out, using "mem_ctx" here, so all intermediate stuff goes
773 * away with the TALLOC_FREE(tmp_ctx) further down. */
774
775 ret_string = talloc_sub_basic(mem_ctx, username, domain, a_string);
776
777 done:
778 TALLOC_FREE(tmp_ctx);
779 return ret_string;
780 }
781
782 /****************************************************************************
783 ****************************************************************************/
784
785 static char *alloc_sub_advanced(const char *servicename, const char *user,
786 const char *connectpath, gid_t gid,
787 const char *smb_name, const char *domain_name,
788 const char *str)
789 {
790 char *a_string, *ret_string;
791 char *b, *p, *s;
792
793 a_string = SMB_STRDUP(str);
794 if (a_string == NULL) {
795 DEBUG(0, ("alloc_sub_advanced: Out of memory!\n"));
796 return NULL;
797 }
798
799 for (b = s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
800
801 b = a_string;
802
803 switch (*(p+1)) {
804 case 'N' :
805 a_string = realloc_string_sub(a_string, "%N", automount_server(user));
806 break;
807 case 'H': {
808 char *h;
809 if ((h = get_user_home_dir(talloc_tos(), user)))
810 a_string = realloc_string_sub(a_string, "%H", h);
811 TALLOC_FREE(h);
812 break;
813 }
814 case 'P':
815 a_string = realloc_string_sub(a_string, "%P", connectpath);
816 break;
817 case 'S':
818 a_string = realloc_string_sub(a_string, "%S", servicename);
819 break;
820 case 'g':
821 a_string = realloc_string_sub(a_string, "%g", gidtoname(gid));
822 break;
823 case 'u':
824 a_string = realloc_string_sub(a_string, "%u", user);
825 break;
826
827 /* Patch from jkf@soton.ac.uk Left the %N (NIS
828 * server name) in standard_sub_basic as it is
829 * a feature for logon servers, hence uses the
830 * username. The %p (NIS server path) code is
831 * here as it is used instead of the default
832 * "path =" string in [homes] and so needs the
833 * service name, not the username. */
834 case 'p':
835 a_string = realloc_string_sub(a_string, "%p",
836 automount_path(servicename));
837 break;
838
839 default:
840 break;
841 }
842
843 p++;
844 if (a_string == NULL) {
845 return NULL;
846 }
847 }
848
849 ret_string = alloc_sub_basic(smb_name, domain_name, a_string);
850 SAFE_FREE(a_string);
851 return ret_string;
852 }
853
854 /*
855 * This obviously is inefficient and needs to be merged into
856 * alloc_sub_advanced...
857 */
858
859 char *talloc_sub_advanced(TALLOC_CTX *mem_ctx,
860 const char *servicename, const char *user,
861 const char *connectpath, gid_t gid,
862 const char *smb_name, const char *domain_name,
863 const char *str)
864 {
865 char *a, *t;
866
867 if (!(a = alloc_sub_advanced(servicename, user, connectpath, gid,
868 smb_name, domain_name, str))) {
869 return NULL;
870 }
871 t = talloc_strdup(mem_ctx, a);
872 SAFE_FREE(a);
873 return t;
874 }
875
876
877 void standard_sub_advanced(const char *servicename, const char *user,
878 const char *connectpath, gid_t gid,
879 const char *smb_name, const char *domain_name,
880 char *str, size_t len)
881 {
882 char *s;
883
884 s = alloc_sub_advanced(servicename, user, connectpath,
885 gid, smb_name, domain_name, str);
886
887 if ( s ) {
888 strncpy( str, s, len );
889 SAFE_FREE( s );
890 }
891 }
892
893 /****************************************************************************
894 Do some standard substitutions in a string.
895 ****************************************************************************/
896
897 char *standard_sub_conn(TALLOC_CTX *ctx, connection_struct *conn, const char *str)
898 {
899 return talloc_sub_advanced(ctx,
900 lp_servicename(SNUM(conn)),
901 conn->user,
902 conn->connectpath,
903 conn->gid,
904 get_smb_user_name(),
905 "",
906 str);
907 }
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