r23398: Support membership of >16 groups on Darwin by making sure we opt in to the
[tprouty/samba.git] / source / smbd / fake_file.c
1 /* 
2    Unix SMB/CIFS implementation.
3    FAKE FILE suppport, for faking up special files windows want access to
4    Copyright (C) Stefan (metze) Metzmacher      2003
5    
6    This program is free software; you can redistribute it and/or modify
7    it under the terms of the GNU General Public License as published by
8    the Free Software Foundation; either version 2 of the License, or
9    (at your option) any later version.
10    
11    This program is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14    GNU General Public License for more details.
15    
16    You should have received a copy of the GNU General Public License
17    along with this program; if not, write to the Free Software
18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #include "includes.h"
22
23 extern struct current_user current_user;
24
25 static FAKE_FILE fake_files[] = {
26 #ifdef WITH_QUOTAS
27         {FAKE_FILE_NAME_QUOTA_UNIX,     FAKE_FILE_TYPE_QUOTA,   init_quota_handle,      destroy_quota_handle},
28 #endif /* WITH_QUOTAS */
29         {NULL,                          FAKE_FILE_TYPE_NONE,    NULL,                   NULL }
30 };
31
32 /****************************************************************************
33  Create a fake file handle
34 ****************************************************************************/
35
36 static struct _FAKE_FILE_HANDLE *init_fake_file_handle(enum FAKE_FILE_TYPE type)
37 {
38         TALLOC_CTX *mem_ctx = NULL;
39         FAKE_FILE_HANDLE *fh = NULL;
40         int i;
41
42         for (i=0;fake_files[i].name!=NULL;i++) {
43                 if (fake_files[i].type==type) {
44                         DEBUG(5,("init_fake_file_handle: for [%s]\n",fake_files[i].name));
45
46                         if ((mem_ctx=talloc_init("fake_file_handle"))==NULL) {
47                                 DEBUG(0,("talloc_init(fake_file_handle) failed.\n"));
48                                 return NULL;    
49                         }
50
51                         if ((fh =TALLOC_ZERO_P(mem_ctx, FAKE_FILE_HANDLE))==NULL) {
52                                 DEBUG(0,("TALLOC_ZERO() failed.\n"));
53                                 talloc_destroy(mem_ctx);
54                                 return NULL;
55                         }
56
57                         fh->type = type;
58                         fh->mem_ctx = mem_ctx;
59
60                         if (fake_files[i].init_pd) {
61                                 fh->pd = fake_files[i].init_pd(fh->mem_ctx);
62                         }
63
64                         fh->free_pd = fake_files[i].free_pd;
65
66                         return fh;
67                 }
68         }
69
70         return NULL;    
71 }
72
73 /****************************************************************************
74  Does this name match a fake filename ?
75 ****************************************************************************/
76
77 enum FAKE_FILE_TYPE is_fake_file(const char *fname)
78 {
79 #ifdef HAVE_SYS_QUOTAS
80         int i;
81 #endif
82
83         if (!fname) {
84                 return FAKE_FILE_TYPE_NONE;
85         }
86
87 #ifdef HAVE_SYS_QUOTAS
88         for (i=0;fake_files[i].name!=NULL;i++) {
89                 if (strncmp(fname,fake_files[i].name,strlen(fake_files[i].name))==0) {
90                         DEBUG(5,("is_fake_file: [%s] is a fake file\n",fname));
91                         return fake_files[i].type;
92                 }
93         }
94 #endif
95
96         return FAKE_FILE_TYPE_NONE;
97 }
98
99
100 /****************************************************************************
101  Open a fake quota file with a share mode.
102 ****************************************************************************/
103
104 NTSTATUS open_fake_file(connection_struct *conn,
105                                 enum FAKE_FILE_TYPE fake_file_type,
106                                 const char *fname,
107                                 uint32 access_mask,
108                                 files_struct **result)
109 {
110         files_struct *fsp = NULL;
111         NTSTATUS status;
112
113         /* access check */
114         if (current_user.ut.uid != 0) {
115                 DEBUG(1,("open_fake_file_shared: access_denied to service[%s] file[%s] user[%s]\n",
116                         lp_servicename(SNUM(conn)),fname,conn->user));
117                 return NT_STATUS_ACCESS_DENIED;
118
119         }
120
121         status = file_new(conn, &fsp);
122         if(!NT_STATUS_IS_OK(status)) {
123                 return status;
124         }
125
126         DEBUG(5,("open_fake_file_shared: fname = %s, FID = %d, access_mask = 0x%x\n",
127                 fname, fsp->fnum, (unsigned int)access_mask));
128
129         fsp->conn = conn;
130         fsp->fh->fd = -1;
131         fsp->vuid = current_user.vuid;
132         fsp->fh->pos = -1;
133         fsp->can_lock = False; /* Should this be true ? - No, JRA */
134         fsp->access_mask = access_mask;
135         string_set(&fsp->fsp_name,fname);
136         
137         fsp->fake_file_handle = init_fake_file_handle(fake_file_type);
138         
139         if (fsp->fake_file_handle==NULL) {
140                 file_free(fsp);
141                 return NT_STATUS_NO_MEMORY;
142         }
143
144         conn->num_files_open++;
145         *result = fsp;
146         return NT_STATUS_OK;
147 }
148
149 void destroy_fake_file_handle(FAKE_FILE_HANDLE **fh)
150 {
151         if (!fh||!(*fh)) {
152                 return;
153         }
154
155         if ((*fh)->free_pd) {
156                 (*fh)->free_pd(&(*fh)->pd);             
157         }
158
159         talloc_destroy((*fh)->mem_ctx);
160         (*fh) = NULL;
161 }
162
163 NTSTATUS close_fake_file(files_struct *fsp)
164 {
165         file_free(fsp);
166         return NT_STATUS_OK;
167 }