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/*
Unix SMB/Netbios implementation.
Version 2.0
SMB wrapper functions
Copyright (C) Andrew Tridgell 1998
Copyright (C) Derrell Lipman 2003-2005
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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdarg.h>
#include <assert.h>
#include "smbw.h"
#include "bsd-strlfunc.h"
typedef enum StartupType
{
StartupType_Fake,
StartupType_Real
} StartupType;
int smbw_fd_map[__FD_SETSIZE];
int smbw_ref_count[__FD_SETSIZE];
char smbw_cwd[PATH_MAX];
char smbw_prefix[] = SMBW_PREFIX;
/* needs to be here because of dumb include files on some systems */
int creat_bits = O_WRONLY|O_CREAT|O_TRUNC;
int smbw_initialized = 0;
static int debug_level = 0;
static SMBCCTX *smbw_ctx;
extern int smbw_debug;
/*****************************************************
smbw_ref -- manipulate reference counts
******************************************************/
int smbw_ref(int client_fd, Ref_Count_Type type, ...)
{
va_list ap;
/* client id values begin at SMBC_BASE_FC. */
client_fd -= SMBC_BASE_FD;
va_start(ap, type);
switch(type)
{
case SMBW_RCT_Increment:
return ++smbw_ref_count[client_fd];
case SMBW_RCT_Decrement:
return --smbw_ref_count[client_fd];
case SMBW_RCT_Get:
return smbw_ref_count[client_fd];
case SMBW_RCT_Set:
return (smbw_ref_count[client_fd] = va_arg(ap, int));
}
va_end(ap);
/* never gets here */
return -1;
}
/*
* Return a username and password given a server and share name
*
* Returns 0 upon success;
* non-zero otherwise, and errno is set to indicate the error.
*/
static void get_envvar_auth_data(const char *srv,
const char *shr,
char *wg, int wglen,
char *un, int unlen,
char *pw, int pwlen)
{
char *u;
char *p;
char *w;
/* Fall back to environment variables */
w = getenv("WORKGROUP");
if (w == NULL) w = "";
u = getenv("USER");
if (u == NULL) u = "";
p = getenv("PASSWORD");
if (p == NULL) p = "";
smbw_strlcpy(wg, w, wglen);
smbw_strlcpy(un, u, unlen);
smbw_strlcpy(pw, p, pwlen);
}
static smbc_get_auth_data_fn get_auth_data_fn = get_envvar_auth_data;
/*****************************************************
set the get auth data function
******************************************************/
void smbw_set_auth_data_fn(smbc_get_auth_data_fn fn)
{
get_auth_data_fn = fn;
}
/*****************************************************
ensure that all connections are terminated upon exit
******************************************************/
static void do_shutdown(void)
{
if (smbw_ctx != NULL) {
smbc_free_context(smbw_ctx, 1);
}
}
/*****************************************************
initialise structures
*******************************************************/
static void do_init(StartupType startupType)
{
int i;
char *p;
smbw_initialized = 1; /* this must be first to avoid recursion! */
smbw_ctx = NULL; /* don't free context until it's established */
/* initially, no file descriptors are mapped */
for (i = 0; i < __FD_SETSIZE; i++) {
smbw_fd_map[i] = -1;
smbw_ref_count[i] = 0;
}
/* See if we've been told to start in a particular directory */
if ((p=getenv("SMBW_DIR")) != NULL) {
smbw_strlcpy(smbw_cwd, p, PATH_MAX);
/* we don't want the old directory to be busy */
(* smbw_libc.chdir)("/");
} else {
*smbw_cwd = '\0';
}
if ((p=getenv("DEBUG"))) {
debug_level = atoi(p);
}
if ((smbw_ctx = smbc_new_context()) == NULL) {
fprintf(stderr, "Could not create a context.\n");
exit(1);
}
smbw_ctx->debug = debug_level;
smbw_ctx->callbacks.auth_fn = get_auth_data_fn;
smbw_ctx->options.browse_max_lmb_count = 0;
smbw_ctx->options.urlencode_readdir_entries = 1;
smbw_ctx->options.one_share_per_server = 1;
if (smbc_init_context(smbw_ctx) == NULL) {
fprintf(stderr, "Could not initialize context.\n");
exit(1);
}
smbc_set_context(smbw_ctx);
/* if not real startup, exit handler has already been established */
if (startupType == StartupType_Real) {
atexit(do_shutdown);
}
}
/*****************************************************
initialise structures, real start up vs a fork()
*******************************************************/
void smbw_init(void)
{
do_init(StartupType_Real);
}
/*****************************************************
determine if a file descriptor is a smb one
*******************************************************/
int smbw_fd(int smbw_fd)
{
SMBW_INIT();
return (smbw_fd >= 0 &&
smbw_fd < __FD_SETSIZE &&
smbw_fd_map[smbw_fd] >= SMBC_BASE_FD); /* minimum smbc_ fd */
}
/*****************************************************
determine if a path is a smb one
*******************************************************/
int smbw_path(const char *name)
{
int len;
int ret;
int saved_errno;
saved_errno = errno;
SMBW_INIT();
len = strlen(smbw_prefix);
ret = ((strncmp(name, smbw_prefix, len) == 0 &&
(name[len] == '\0' || name[len] == '/')) ||
(*name != '/' && *smbw_cwd != '\0'));
errno = saved_errno;
return ret;
}
/*****************************************************
remove redundent stuff from a filename
*******************************************************/
void smbw_clean_fname(char *name)
{
char *p, *p2;
int l;
int modified = 1;
if (!name) return;
DEBUG(10, ("Clean [%s]...\n", name));
while (modified) {
modified = 0;
if ((p=strstr(name,"/./"))) {
modified = 1;
while (*p) {
p[0] = p[2];
p++;
}
DEBUG(10, ("\tclean 1 (/./) produced [%s]\n", name));
}
if ((p=strstr(name,"//"))) {
modified = 1;
while (*p) {
p[0] = p[1];
p++;
}
DEBUG(10, ("\tclean 2 (//) produced [%s]\n", name));
}
if (strcmp(name,"/../")==0) {
modified = 1;
name[1] = 0;
DEBUG(10,("\tclean 3 (^/../$) produced [%s]\n", name));
}
if ((p=strstr(name,"/../"))) {
modified = 1;
for (p2 = (p > name ? p-1 : p); p2 > name; p2--) {
if (p2[0] == '/') break;
}
if (p2 > name) p2++;
while (*p2) {
p2[0] = p[3];
p2++;
p++;
}
DEBUG(10, ("\tclean 4 (/../) produced [%s]\n", name));
}
if (strcmp(name,"/..")==0) {
modified = 1;
name[1] = 0;
DEBUG(10, ("\tclean 5 (^/..$) produced [%s]\n", name));
}
l = strlen(name);
p = l>=3?(name+l-3):name;
if (strcmp(p,"/..")==0) {
modified = 1;
for (p2=p-1;p2>name;p2--) {
if (p2[0] == '/') break;
}
if (p2==name) {
p[0] = '/';
p[1] = 0;
} else {
p2[0] = 0;
}
DEBUG(10, ("\tclean 6 (/..) produced [%s]\n", name));
}
l = strlen(name);
p = l>=2?(name+l-2):name;
if (strcmp(p,"/.")==0) {
modified = 1;
if (p == name) {
p[1] = 0;
} else {
p[0] = 0;
}
DEBUG(10, ("\tclean 7 (/.) produced [%s]\n", name));
}
if (strncmp(p=name,"./",2) == 0) {
modified = 1;
do {
p[0] = p[2];
} while (*p++);
DEBUG(10, ("\tclean 8 (^./) produced [%s]\n", name));
}
l = strlen(p=name);
if (l > 1 && p[l-1] == '/') {
modified = 1;
p[l-1] = 0;
DEBUG(10, ("\tclean 9 (/) produced [%s]\n", name));
}
}
}
void smbw_fix_path(const char *src, char *dest)
{
const char *p;
int len = strlen(smbw_prefix);
if (*src == '/') {
for (p = src + len; *p == '/'; p++)
;
snprintf(dest, PATH_MAX, "smb://%s", p);
} else {
snprintf(dest, PATH_MAX, "%s/%s", smbw_cwd, src);
}
smbw_clean_fname(dest + 5);
DEBUG(10, ("smbw_fix_path(%s) returning [%s]\n", src, dest));
}
/*****************************************************
a wrapper for open()
*******************************************************/
int smbw_open(const char *fname, int flags, mode_t mode)
{
int client_fd;
int smbw_fd;
char path[PATH_MAX];
SMBW_INIT();
if (!fname) {
errno = EINVAL;
return -1;
}
smbw_fd = (smbw_libc.open)(SMBW_DUMMY, O_WRONLY, 0200);
if (smbw_fd == -1) {
errno = EMFILE;
return -1;
}
smbw_fix_path(fname, path);
if (flags == creat_bits) {
client_fd = smbc_creat(path, mode);
} else {
client_fd = smbc_open(path, flags, mode);
}
if (client_fd < 0) {
(* smbw_libc.close)(smbw_fd);
return -1;
}
smbw_fd_map[smbw_fd] = client_fd;
smbw_ref(client_fd, SMBW_RCT_Increment);
return smbw_fd;
}
/*****************************************************
a wrapper for pread()
there should really be an smbc_pread() to avoid the two
lseek()s required in this kludge.
*******************************************************/
ssize_t smbw_pread(int smbw_fd, void *buf, size_t count, SMBW_OFF_T ofs)
{
int client_fd;
ssize_t ret;
int saved_errno;
SMBW_OFF_T old_ofs;
if (count == 0) {
return 0;
}
client_fd = smbw_fd_map[smbw_fd];
if ((old_ofs = smbc_lseek(client_fd, 0, SEEK_CUR)) < 0 ||
smbc_lseek(client_fd, ofs, SEEK_SET) < 0) {
return -1;
}
if ((ret = smbc_read(client_fd, buf, count)) < 0) {
saved_errno = errno;
(void) smbc_lseek(client_fd, old_ofs, SEEK_SET);
errno = saved_errno;
return -1;
}
return ret;
}
/*****************************************************
a wrapper for read()
*******************************************************/
ssize_t smbw_read(int smbw_fd, void *buf, size_t count)
{
int client_fd;
client_fd = smbw_fd_map[smbw_fd];
return smbc_read(client_fd, buf, count);
}
/*****************************************************
a wrapper for write()
*******************************************************/
ssize_t smbw_write(int smbw_fd, void *buf, size_t count)
{
int client_fd;
client_fd = smbw_fd_map[smbw_fd];
return smbc_write(client_fd, buf, count);
}
/*****************************************************
a wrapper for pwrite()
*******************************************************/
ssize_t smbw_pwrite(int smbw_fd, void *buf, size_t count, SMBW_OFF_T ofs)
{
int saved_errno;
int client_fd;
ssize_t ret;
SMBW_OFF_T old_ofs;
if (count == 0) {
return 0;
}
client_fd = smbw_fd_map[smbw_fd];
if ((old_ofs = smbc_lseek(client_fd, 0, SEEK_CUR)) < 0 ||
smbc_lseek(client_fd, ofs, SEEK_SET) < 0) {
return -1;
}
if ((ret = smbc_write(client_fd, buf, count)) < 0) {
saved_errno = errno;
(void) smbc_lseek(client_fd, old_ofs, SEEK_SET);
errno = saved_errno;
return -1;
}
return ret;
}
/*****************************************************
a wrapper for close()
*******************************************************/
int smbw_close(int smbw_fd)
{
int client_fd;
client_fd = smbw_fd_map[smbw_fd];
if (smbw_ref(client_fd, SMBW_RCT_Decrement) > 0) {
return 0;
}
(* smbw_libc.close)(smbw_fd);
smbw_fd_map[smbw_fd] = -1;
return smbc_close(client_fd);
}
/*****************************************************
a wrapper for fcntl()
*******************************************************/
int smbw_fcntl(int smbw_fd, int cmd, long arg)
{
return 0;
}
/*****************************************************
a wrapper for access()
*******************************************************/
int smbw_access(const char *name, int mode)
{
struct SMBW_stat st;
SMBW_INIT();
if (smbw_stat(name, &st)) return -1;
if (((mode & R_OK) && !(st.s_mode & S_IRUSR)) ||
((mode & W_OK) && !(st.s_mode & S_IWUSR)) ||
((mode & X_OK) && !(st.s_mode & S_IXUSR))) {
errno = EACCES;
return -1;
}
return 0;
}
/*****************************************************
a wrapper for readlink() - needed for correct errno setting
*******************************************************/
int smbw_readlink(const char *fname, char *buf, size_t bufsize)
{
struct SMBW_stat st;
int ret;
SMBW_INIT();
ret = smbw_stat(fname, &st);
if (ret != 0) {
return -1;
}
/* it exists - say it isn't a link */
errno = EINVAL;
return -1;
}
/*****************************************************
a wrapper for unlink()
*******************************************************/
int smbw_unlink(const char *fname)
{
char path[PATH_MAX];
SMBW_INIT();
smbw_fix_path(fname, path);
return smbc_unlink(path);
}
/*****************************************************
a wrapper for rename()
*******************************************************/
int smbw_rename(const char *oldname, const char *newname)
{
char path_old[PATH_MAX];
char path_new[PATH_MAX];
SMBW_INIT();
smbw_fix_path(oldname, path_old);
smbw_fix_path(newname, path_new);
return smbc_rename(path_old, path_new);
}
/*****************************************************
a wrapper for utimes
*******************************************************/
int smbw_utimes(const char *fname, void *buf)
{
char path[PATH_MAX];
smbw_fix_path(fname, path);
return smbc_utimes(path, buf);
}
/*****************************************************
a wrapper for utime
*******************************************************/
int smbw_utime(const char *fname, void *buf)
{
char path[PATH_MAX];
smbw_fix_path(fname, path);
return smbc_utime(path, buf);
}
/*****************************************************
a wrapper for chown()
*******************************************************/
int smbw_chown(const char *fname, uid_t owner, gid_t group)
{
/* always indiciate that this is not supported. */
errno = ENOTSUP;
return -1;
}
/*****************************************************
a wrapper for chmod()
*******************************************************/
int smbw_chmod(const char *fname, mode_t newmode)
{
char path[PATH_MAX];
smbw_fix_path(fname, path);
return smbc_chmod(path, newmode);
}
/*****************************************************
a wrapper for lseek()
*******************************************************/
SMBW_OFF_T smbw_lseek(int smbw_fd,
SMBW_OFF_T offset,
int whence)
{
int client_fd;
SMBW_OFF_T ret;
client_fd = smbw_fd_map[smbw_fd];
ret = smbc_lseek(client_fd, offset, whence);
if (smbw_debug)
{
printf("smbw_lseek(%d/%d, 0x%llx) returned 0x%llx\n",
smbw_fd, client_fd,
(unsigned long long) offset,
(unsigned long long) ret);
}
return ret;
}
/*****************************************************
a wrapper for dup()
*******************************************************/
int smbw_dup(int smbw_fd)
{
int fd2;
fd2 = (smbw_libc.dup)(smbw_fd);
if (fd2 == -1) {
return -1;
}
smbw_fd_map[fd2] = smbw_fd_map[smbw_fd];
smbw_ref(smbw_fd_map[smbw_fd], SMBW_RCT_Increment);
return fd2;
}
/*****************************************************
a wrapper for dup2()
*******************************************************/
int smbw_dup2(int smbw_fd, int fd2)
{
if ((* smbw_libc.dup2)(smbw_fd, fd2) != fd2) {
return -1;
}
smbw_fd_map[fd2] = smbw_fd_map[smbw_fd];
smbw_ref(smbw_fd_map[smbw_fd], SMBW_RCT_Increment);
return fd2;
}
/*****************************************************
when we fork we have to close all connections and files
in the child
*******************************************************/
int smbw_fork(void)
{
int i;
pid_t child_pid;
int p[2];
char c = 0;
SMBW_INIT();
if (pipe(p)) return (* smbw_libc.fork)();
child_pid = (* smbw_libc.fork)();
if (child_pid) {
/* block the parent for a moment until the sockets are
closed */
(* smbw_libc.close)(p[1]);
(* smbw_libc.read)(p[0], &c, 1);
(* smbw_libc.close)(p[0]);
return child_pid;
}
(* smbw_libc.close)(p[0]);
/* close all server connections and locally-opened files */
for (i = 0; i < __FD_SETSIZE; i++) {
if (smbw_fd_map[i] > 0 &&
smbw_ref(smbw_fd_map[i], SMBW_RCT_Get) > 0) {
smbc_close(smbw_fd_map[i]);
smbw_ref(smbw_fd_map[i], SMBW_RCT_Set, 0);
(* smbw_libc.close)(i);
}
smbw_fd_map[i] = -1;
}
/* unblock the parent */
write(p[1], &c, 1);
(* smbw_libc.close)(p[1]);
/* specify directory to start in, if it's simulated smb */
if (*smbw_cwd != '\0') {
setenv("SMBW_DIR", smbw_cwd, 1);
} else {
unsetenv("SMBW_DIR");
}
/* Re-initialize this library for the child */
do_init(StartupType_Fake);
/* and continue in the child */
return 0;
}
int smbw_setxattr(const char *fname,
const char *name,
const void *value,
size_t size,
int flags)
{
char path[PATH_MAX];
if (strcmp(name, "system.posix_acl_access") == 0)
{
name = "system.*";
}
smbw_fix_path(fname, path);
return smbc_setxattr(path, name, value, size, flags);
}
int smbw_lsetxattr(const char *fname,
const char *name,
const void *value,
size_t size,
int flags)
{
char path[PATH_MAX];
if (strcmp(name, "system.posix_acl_access") == 0)
{
name = "system.*";
}
smbw_fix_path(fname, path);
return smbc_lsetxattr(path, name, value, size, flags);
}
int smbw_fsetxattr(int smbw_fd,
const char *name,
const void *value,
size_t size,
int flags)
{
int client_fd;
if (strcmp(name, "system.posix_acl_access") == 0)
{
name = "system.*";
}
client_fd = smbw_fd_map[smbw_fd];
return smbc_fsetxattr(client_fd, name, value, size, flags);
}
int smbw_getxattr(const char *fname,
const char *name,
const void *value,
size_t size)
{
char path[PATH_MAX];
if (strcmp(name, "system.posix_acl_access") == 0)
{
name = "system.*";
}
smbw_fix_path(fname, path);
return smbc_getxattr(path, name, value, size);
}
int smbw_lgetxattr(const char *fname,
const char *name,
const void *value,
size_t size)
{
char path[PATH_MAX];
if (strcmp(name, "system.posix_acl_access") == 0)
{
name = "system.*";
}
smbw_fix_path(fname, path);
return smbc_lgetxattr(path, name, value, size);
}
int smbw_fgetxattr(int smbw_fd,
const char *name,
const void *value,
size_t size)
{
int client_fd;
if (strcmp(name, "system.posix_acl_access") == 0)
{
name = "system.*";
}
client_fd = smbw_fd_map[smbw_fd];
return smbc_fgetxattr(client_fd, name, value, size);
}
int smbw_removexattr(const char *fname,
const char *name)
{
char path[PATH_MAX];
if (strcmp(name, "system.posix_acl_access") == 0)
{
name = "system.*";
}
smbw_fix_path(fname, path);
return smbc_removexattr(path, name);
}
int smbw_lremovexattr(const char *fname,
const char *name)
{
char path[PATH_MAX];
if (strcmp(name, "system.posix_acl_access") == 0)
{
name = "system.*";
}
smbw_fix_path(fname, path);
return smbc_lremovexattr(path, name);
}
int smbw_fremovexattr(int smbw_fd,
const char *name)
{
int client_fd;
if (strcmp(name, "system.posix_acl_access") == 0)
{
name = "system.*";
}
client_fd = smbw_fd_map[smbw_fd];
return smbc_fremovexattr(client_fd, name);
}
int smbw_listxattr(const char *fname,
char *list,
size_t size)
{
char path[PATH_MAX];
smbw_fix_path(fname, path);
return smbc_listxattr(path, list, size);
}
int smbw_llistxattr(const char *fname,
char *list,
size_t size)
{
char path[PATH_MAX];
smbw_fix_path(fname, path);
return smbc_llistxattr(path, list, size);
}
int smbw_flistxattr(int smbw_fd,
char *list,
size_t size)
{
int client_fd;
client_fd = smbw_fd_map[smbw_fd];
return smbc_flistxattr(client_fd, list, size);
}
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