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authorJeremy Allison <jra@samba.org>2001-05-16 02:12:37 +0000
committerJeremy Allison <jra@samba.org>2001-05-16 02:12:37 +0000
commit0609cd3162173575d22fbd12c48e777a5b15553e (patch)
treef169a01535054df36dad345a1450c1f8faccf0af /examples/VFS/block/block.c
parent86557d633648f279e6ceda4da38801889ca4ed95 (diff)
downloadsamba-0609cd3162173575d22fbd12c48e777a5b15553e.tar.gz
Added example vfs block example from Ronald Kuetemeier <ronald@kuetemeier.com>.
Jeremy.
Diffstat (limited to 'examples/VFS/block/block.c')
-rw-r--r--examples/VFS/block/block.c546
1 files changed, 546 insertions, 0 deletions
diff --git a/examples/VFS/block/block.c b/examples/VFS/block/block.c
new file mode 100644
index 00000000000..3c4f736e849
--- /dev/null
+++ b/examples/VFS/block/block.c
@@ -0,0 +1,546 @@
+/*
+ *
+ * Block access from links to dev mount points specified in PARAMCONF file
+ *
+ * Copyright (C) Ronald Kuetemeier, 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <string.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+
+#ifdef HAVE_UTIME_H
+#include <utime.h>
+#endif
+#ifdef HAVE_DIRENT_H
+#include <dirent.h>
+#endif
+#include <syslog.h>
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
+
+#include <includes.h>
+#include <vfs.h>
+
+
+
+DIR *block_opendir(struct connection_struct *conn, char *fname);
+int block_connect(struct connection_struct *conn, char *service, char *user);
+void block_disconnect(struct connection_struct *conn);
+
+
+/* VFS operations */
+
+
+extern struct vfs_ops default_vfs_ops; /* For passthrough operation */
+
+struct vfs_ops execute_vfs_ops = {
+
+ /* Disk operations */
+
+ block_connect,
+ block_disconnect,
+ NULL, /* disk free */
+
+ /* Directory operations */
+
+ block_opendir,
+ NULL, /* readdir */
+ NULL,
+ NULL,
+ NULL, /* closedir */
+
+ /* File operations */
+
+ NULL,
+ NULL,
+ NULL, /* read */
+ NULL, /* write */
+ NULL, /* lseek */
+ NULL,
+ NULL, /* fsync */
+ NULL, /* stat */
+ NULL, /* fstat */
+ NULL, /* lstat */
+ NULL,
+ NULL,
+ NULL,
+ NULL, /* chown */
+ NULL,
+ NULL, /* chdir */
+ NULL, /* getwd */
+ NULL, /* utime */
+ NULL, /* ftruncate */
+ NULL, /* lock */
+ NULL, /* fget_nt_acl */
+ NULL, /* get_nt_acl */
+ NULL, /* fset_nt_acl */
+ NULL, /* set_nt_acl */
+ NULL,
+ NULL
+};
+
+
+#ifndef PARAMCONF
+#define PARAMCONF "/etc/samba-block.conf"
+#endif
+
+extern BOOL pm_process(char *FileName, BOOL (*sfunc)(char *), BOOL(*pfunc)(char * , char *));
+
+//functions
+
+BOOL enter_pblock_mount(char *dir);
+BOOL get_section(char *sect);
+BOOL get_parameter_value(char *param, char *value);
+BOOL load_param(void);
+BOOL search(struct stat *stat_buf);
+BOOL dir_search(char *link, char *dir);
+BOOL enter_pblock_dir(char *dir);
+
+
+
+typedef struct block_dir
+{
+ dev_t st_dev;
+ int str_len;
+ char *dir_name;
+ struct block_dir *next;
+} block_dir;
+
+
+static char *params[] = {"mount_point","dir_name"};
+enum { MOUNT_POINT , DIR_NAME };
+
+static struct block_dir *pblock_mountp = NULL;
+static struct block_dir *pblock_dir = NULL;
+
+
+
+/*
+ * Load the conf file into a table
+ */
+
+BOOL load_param(void)
+{
+
+ if ((pm_process(PARAMCONF,&get_section,&get_parameter_value)) == TRUE)
+ {
+ return TRUE;
+
+ }
+ return FALSE;
+}
+
+
+
+/*
+ * Enter the key and data into the list
+ *
+ */
+
+BOOL enter_pblock_mount(char *dir)
+{
+ struct stat stat_buf;
+ static struct block_dir *tmp_pblock;
+
+
+ if((stat(dir,&stat_buf)) != 0)
+ {
+ return FALSE;
+ }
+
+ if(pblock_mountp == NULL)
+ {
+ pblock_mountp = calloc(1, sizeof(block_dir));
+ if( pblock_mountp == NULL)
+ {
+ return FALSE;
+ }
+ tmp_pblock = pblock_mountp;
+ tmp_pblock->next = NULL;
+
+ }else
+ {
+ tmp_pblock->next = calloc(1, sizeof(block_dir));
+ if(tmp_pblock->next == NULL)
+ {
+ return FALSE;
+ }
+ tmp_pblock = tmp_pblock->next;
+ tmp_pblock->next = NULL;
+
+ }
+
+
+ tmp_pblock->st_dev = stat_buf.st_dev;
+ tmp_pblock->dir_name = strdup(dir);
+
+
+ return TRUE;
+
+}
+
+
+/*
+ * Enter the key and data into the list
+ *
+ */
+
+BOOL enter_pblock_dir(char *dir)
+{
+ static struct block_dir *tmp_pblock;
+
+
+ if(pblock_dir == NULL)
+ {
+ pblock_dir = calloc(1, sizeof(block_dir));
+ if( pblock_dir == NULL)
+ {
+ return FALSE;
+ }
+ tmp_pblock = pblock_dir;
+ tmp_pblock->next = NULL;
+
+ }else
+ {
+ tmp_pblock->next = calloc(1, sizeof(block_dir));
+ if(tmp_pblock->next == NULL)
+ {
+ return FALSE;
+ }
+ tmp_pblock = tmp_pblock->next;
+ tmp_pblock->next = NULL;
+
+ }
+
+
+ tmp_pblock->dir_name = strdup(dir);
+ tmp_pblock->str_len = strlen(dir);
+
+
+ return TRUE;
+
+}
+
+
+
+
+/*
+ * Function callback for config section names
+ */
+
+BOOL get_section(char *sect)
+{
+ return TRUE;
+}
+
+
+
+/*
+ * Function callback for config parameter value pairs
+ *
+ */
+
+BOOL get_parameter_value(char *param, char *value)
+{
+ int i = 0, maxargs = sizeof(params) / sizeof(char *);
+
+
+ for( i= 0; i < maxargs; i++)
+ {
+ if (strcmp(param,params[i]) == 0)
+ {
+ switch(i)
+ {
+ case MOUNT_POINT :
+ enter_pblock_mount(value);
+ break;
+ case DIR_NAME :
+ enter_pblock_dir(value);
+ break;
+ default :
+ break;
+ }
+ }
+ }
+
+ return TRUE;
+
+}
+
+
+
+
+/* VFS initialisation function. Return initialised vfs_ops structure
+ back to SAMBA. */
+
+struct vfs_ops *vfs_init(int *vfs_version)
+{
+ *vfs_version = SMB_VFS_INTERFACE_VERSION;
+
+ return(&execute_vfs_ops);
+}
+
+
+/*
+ * VFS connect and param file loading
+ */
+
+int block_connect(struct connection_struct *conn, char *service, char *user)
+{
+ if((load_param()) == FALSE)
+ {
+
+ return -1;
+
+ }
+
+ DEBUG(0,("%s connecting \n",conn->user));
+
+ return (default_vfs_ops.connect(conn, service,user));
+}
+
+/*
+ * Free allocated structures and disconnect
+ *
+ */
+
+
+void block_disconnect(struct connection_struct *conn)
+{
+
+ struct block_dir *tmp_pblock = (pblock_mountp == NULL ? pblock_dir : pblock_mountp);
+ struct block_dir *free_pblock = NULL;
+
+ while(tmp_pblock != NULL)
+ {
+ free(tmp_pblock->dir_name);
+ free_pblock = tmp_pblock;
+ tmp_pblock = tmp_pblock->next;
+ free(free_pblock);
+
+ if(tmp_pblock == NULL && pblock_dir != NULL)
+ {
+ tmp_pblock = (pblock_mountp == NULL ? pblock_dir : NULL);
+ pblock_dir = NULL;
+
+ }
+
+ }
+
+
+
+ default_vfs_ops.disconnect(conn);
+}
+
+/*
+ * VFS opendir
+ */
+
+DIR *block_opendir(struct connection_struct *conn, char *fname)
+{
+
+ char *dir_name = NULL;
+ struct stat stat_buf;
+
+ dir_name = alloca((strlen(conn->origpath) + strlen(fname) + 2) * sizeof(char));
+
+ pstrcpy(dir_name,conn->origpath);
+ pstrcat(dir_name, "/");
+ strncat(dir_name, fname, strcspn(fname,"/"));
+
+ if((lstat(dir_name,&stat_buf)) == 0)
+ {
+ if((S_ISLNK(stat_buf.st_mode)) == 1)
+ {
+ stat(dir_name,&stat_buf);
+ if((search(&stat_buf) || dir_search(dir_name, fname) ) == TRUE)
+ {
+ DEBUG(0,("%s used link to blocked dir: %s \n", conn->user, dir_name));
+ errno = EACCES;
+ return NULL;
+ }
+ }
+ }
+
+ return (default_vfs_ops.opendir(conn, fname));
+}
+
+
+/*
+ * Find mount point to block in list
+ */
+
+BOOL search(struct stat *stat_buf)
+{
+ struct block_dir *tmp_pblock = pblock_mountp;
+
+ while(tmp_pblock != NULL)
+ {
+
+ if(tmp_pblock->st_dev == stat_buf->st_dev)
+ {
+ return TRUE;
+ }
+ tmp_pblock = tmp_pblock->next;
+ }
+
+ return FALSE;
+
+}
+
+/*
+ * Find dir in list to block id the starting point is link from a share
+ */
+
+BOOL dir_search(char *link, char *dir)
+{
+ char buf[PATH_MAX +1], *ext_path;
+ int len = 0;
+ struct block_dir *tmp_pblock = pblock_dir;
+
+ if((len = readlink(link,buf,sizeof(buf))) == -1)
+ {
+ return TRUE;
+
+ }else
+ {
+ buf[len] = '\0';
+ }
+
+
+ if((ext_path = strchr(dir,'/')) != NULL)
+ {
+ pstrcat(buf,&ext_path[1]);
+ len = strlen(buf);
+ }
+
+ while(tmp_pblock != NULL)
+ {
+ if(len < tmp_pblock->str_len)
+ {
+ tmp_pblock = tmp_pblock->next;
+ continue;
+ }
+
+ if((strstr(buf,tmp_pblock->dir_name)) != NULL)
+ {
+ return TRUE;
+ }
+ tmp_pblock = tmp_pblock->next;
+ }
+
+
+ return FALSE;
+
+}
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