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Diffstat (limited to 'examples/libsmbclient/smbwrapper/wrapper.c')
| -rw-r--r-- | examples/libsmbclient/smbwrapper/wrapper.c | 1729 |
1 files changed, 1729 insertions, 0 deletions
diff --git a/examples/libsmbclient/smbwrapper/wrapper.c b/examples/libsmbclient/smbwrapper/wrapper.c new file mode 100644 index 0000000000..71d6f203ad --- /dev/null +++ b/examples/libsmbclient/smbwrapper/wrapper.c @@ -0,0 +1,1729 @@ +/* + Unix SMB/Netbios implementation. + Version 2.0 + SMB wrapper functions + Copyright (C) Andrew Tridgell 1998 + Copyright (C) Derrell Lipman 2002-2005 + + 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. +*/ + +/* + * This is a rewrite of the original wrapped.c file, using libdl to obtain + * pointers into the C library rather than attempting to find undocumented + * functions in the C library to call for native file access. The problem + * with the original implementation's paradigm is that samba manipulates + * defines such that it gets the sizes of structures that it wants + * (e.g. mapping 32-bit functions to 64-bit functions with their associated + * 64-bit structure fields), but programs run under smbsh or using + * smbwrapper.so were not necessarily compiled with the same flags. As an + * example of the problem, a program calling stat() passes a pointer to a + * "struct stat" but the fields in that structure are different in samba than + * they are in the calling program if the calling program was not compiled to + * force stat() to be mapped to stat64(). + * + * In this version, we provide an interface to each of the native functions, + * not just the ones that samba is compiled to map to. We obtain the function + * pointers from the C library using dlsym(), and for native file operations, + * directly call the same function that the calling application was + * requesting. Since the size of the calling application's structures vary + * depending on what function was called, we use our own internal structures + * for passing information to/from the SMB equivalent functions, and map them + * back to the native structures before returning the result to the caller. + * + * This implementation was completed 25 December 2002. + * Derrell Lipman + */ + +/* We do not want auto munging of 32->64 bit names in this file (only) */ +#undef _FILE_OFFSET_BITS +#undef _GNU_SOURCE + +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/time.h> +#include <stdlib.h> +#include <fcntl.h> +#include <unistd.h> +#include <utime.h> +#include <stdio.h> +#include <dirent.h> +#include <signal.h> +#include <stdarg.h> +#include <dlfcn.h> +#include <errno.h> +#include "libsmbclient.h" +#include "wrapper.h" + +/* + * Debug bits: + * 0x0 = none + * 0x1 = display symbol definitions not found in C library + * 0x2 = show wrapper functions being called + * 0x4 = log to file SMBW_DEBUG_FILE instead of stderr + */ +#define SMBW_DEBUG 0x0 +#define SMBW_DEBUG_FILE "/tmp/smbw.log" + +int smbw_debug = 0; + +#if SMBW_DEBUG & 0x2 +static int debugFd = 2; +#endif + +#ifndef ENOTSUP +#define ENOTSUP EOPNOTSUPP +#endif + +/* + * None of the methods of having the initialization function called + * automatically upon shared library startup are effective in all situations. + * We provide the "-init" parameter to the linker which is effective most of + * the time, but fails for applications that provide their own shared + * libraries with _init() functions (e.g. ps). We can't use "-z initfirst" + * because the environment isn't yet set up at that point, so we can't find + * our shared memory identifier (see shared.c). We therefore must resort to + * this tried-and-true method of keeping an "initialized" flag. We check it + * prior to calling the initialize() function to save a function call (a slow + * operation on x86). + */ +#if SMBW_DEBUG & 0x2 +# define check_init(buf) \ + do { \ + int saved_errno = errno; \ + if (! initialized) initialize(); \ + (* smbw_libc.write)(debugFd, "["buf"]", sizeof(buf)+1); \ + errno = saved_errno; \ + } while (0); +#else +# define check_init(buf) \ + do { \ + if (! initialized) smbw_initialize(); \ + } while (0); +#endif + +static void initialize(void); + +static int initialized = 0; + +SMBW_libc_pointers smbw_libc; + +/* + * A public entry point used by the "-init" option to the linker. + */ +void smbw_initialize(void) +{ + initialize(); +} + +static void initialize(void) +{ + void *lib = NULL; + int saved_errno; +#if SMBW_DEBUG & 0x1 + char *error; +#endif + + saved_errno = errno; + + if (initialized) { + errno = saved_errno; + return; + } + initialized = 1; + + if ((lib = dlopen("/lib/libc.so.6", RTLD_NOW | RTLD_GLOBAL)) == NULL) { + exit(1); + } + +#if SMBW_DEBUG & 0x1 +# define GETSYM(symname, symstring) \ + if ((smbw_libc.symname = dlsym(lib, symstring)) == NULL) { \ + if (smbw_libc.write != NULL && \ + (error = dlerror()) != NULL) { \ + (* smbw_libc.write)(1, error, strlen(error)); \ + (* smbw_libc.write)(1, "\n", 1); \ + } \ + } +#else +# define GETSYM(symname, symstring) \ + smbw_libc.symname = dlsym(lib, symstring); +#endif + + /* + * Get pointers to each of the symbols we'll need, from the C library + * + * Some of these symbols may not be found in the C library. That's + * fine. We declare all of them here, and if the C library supports + * them, they may be called so we have the wrappers for them. If the + * C library doesn't support them, then the wrapper function will + * never be called, and the null pointer will never be dereferenced. + */ + do { + GETSYM(write, "write"); /* first, to allow debugging */ + GETSYM(open, "open"); + GETSYM(_open, "_open"); + GETSYM(__open, "__open"); + GETSYM(open64, "open64"); + GETSYM(_open64, "_open64"); + GETSYM(__open64, "__open64"); + GETSYM(pread, "pread"); + GETSYM(pread64, "pread64"); + GETSYM(pwrite, "pwrite"); + GETSYM(pwrite64, "pwrite64"); + GETSYM(close, "close"); + GETSYM(__close, "__close"); + GETSYM(_close, "_close"); + GETSYM(fcntl, "fcntl"); + GETSYM(__fcntl, "__fcntl"); + GETSYM(_fcntl, "_fcntl"); + GETSYM(getdents, "getdents"); + GETSYM(__getdents, "__getdents"); + GETSYM(_getdents, "_getdents"); + GETSYM(getdents64, "getdents64"); + GETSYM(lseek, "lseek"); + GETSYM(__lseek, "__lseek"); + GETSYM(_lseek, "_lseek"); + GETSYM(lseek64, "lseek64"); + GETSYM(__lseek64, "__lseek64"); + GETSYM(_lseek64, "_lseek64"); + GETSYM(read, "read"); + GETSYM(__read, "__read"); + GETSYM(_read, "_read"); + GETSYM(__write, "__write"); + GETSYM(_write, "_write"); + GETSYM(access, "access"); + GETSYM(chmod, "chmod"); + GETSYM(fchmod, "fchmod"); + GETSYM(chown, "chown"); + GETSYM(fchown, "fchown"); + GETSYM(__xstat, "__xstat"); + GETSYM(getcwd, "getcwd"); + GETSYM(mkdir, "mkdir"); + GETSYM(__fxstat, "__fxstat"); + GETSYM(__lxstat, "__lxstat"); + GETSYM(stat, "stat"); + GETSYM(lstat, "lstat"); + GETSYM(fstat, "fstat"); + GETSYM(unlink, "unlink"); + GETSYM(utime, "utime"); + GETSYM(utimes, "utimes"); + GETSYM(readlink, "readlink"); + GETSYM(rename, "rename"); + GETSYM(rmdir, "rmdir"); + GETSYM(symlink, "symlink"); + GETSYM(dup, "dup"); + GETSYM(dup2, "dup2"); + GETSYM(opendir, "opendir"); + GETSYM(readdir, "readdir"); + GETSYM(closedir, "closedir"); + GETSYM(telldir, "telldir"); + GETSYM(seekdir, "seekdir"); + GETSYM(creat, "creat"); + GETSYM(creat64, "creat64"); + GETSYM(__xstat64, "__xstat64"); + GETSYM(stat64, "stat64"); + GETSYM(__fxstat64, "__fxstat64"); + GETSYM(fstat64, "fstat64"); + GETSYM(__lxstat64, "__lxstat64"); + GETSYM(lstat64, "lstat64"); + GETSYM(_llseek, "_llseek"); + GETSYM(readdir64, "readdir64"); + GETSYM(readdir_r, "readdir_r"); + GETSYM(readdir64_r, "readdir64_r"); + GETSYM(setxattr, "setxattr"); + GETSYM(lsetxattr, "lsetxattr"); + GETSYM(fsetxattr, "fsetxattr"); + GETSYM(getxattr, "getxattr"); + GETSYM(lgetxattr, "lgetxattr"); + GETSYM(fgetxattr, "fgetxattr"); + GETSYM(removexattr, "removexattr"); + GETSYM(lremovexattr, "lremovexattr"); + GETSYM(fremovexattr, "fremovexattr"); + GETSYM(listxattr, "listxattr"); + GETSYM(llistxattr, "llistxattr"); + GETSYM(flistxattr, "flistxattr"); + GETSYM(chdir, "chdir"); + GETSYM(fchdir, "fchdir"); + GETSYM(fork, "fork"); + GETSYM(select, "select"); + GETSYM(_select, "_select"); + GETSYM(__select, "__select"); + } while (0); + + dlclose(lib); + + if ((lib = dlopen("/lib/libc.so.6", RTLD_NOW | RTLD_GLOBAL)) == NULL) { + exit(1); + } + +#if SMBW_DEBUG & 4 + { + if ((debugFd = + open(SMBW_DEBUG_FILE, O_WRONLY | O_CREAT | O_APPEND)) < 0) + { +# define SMBW_MESSAGE "Could not create " SMBW_DEBUG_FILE "\n" + (* smbw_libc.write)(1, SMBW_MESSAGE, sizeof(SMBW_MESSAGE)); +# undef SMBW_MESSAGE + exit(1); + } + } +#endif + + errno = saved_errno; +} + +/** + ** Static Functions + **/ + +static void stat_convert(struct SMBW_stat *src, struct stat *dest) +{ + memset(dest, '\0', sizeof(*dest)); + dest->st_size = src->s_size; + dest->st_mode = src->s_mode; + dest->st_ino = src->s_ino; + dest->st_dev = src->s_dev; + dest->st_rdev = src->s_rdev; + dest->st_nlink = src->s_nlink; + dest->st_uid = src->s_uid; + dest->st_gid = src->s_gid; + dest->st_atime = src->s_atime; + dest->st_mtime = src->s_mtime; + dest->st_ctime = src->s_ctime; + dest->st_blksize = src->s_blksize; + dest->st_blocks = src->s_blocks; +} + +static void stat64_convert(struct SMBW_stat *src, struct stat64 *dest) +{ + memset(dest, '\0', sizeof(*dest)); + dest->st_size = src->s_size; + dest->st_mode = src->s_mode; + dest->st_ino = src->s_ino; + dest->st_dev = src->s_dev; + dest->st_rdev = src->s_rdev; + dest->st_nlink = src->s_nlink; + dest->st_uid = src->s_uid; + dest->st_gid = src->s_gid; + dest->st_atime = src->s_atime; + dest->st_mtime = src->s_mtime; + dest->st_ctime = src->s_ctime; + dest->st_blksize = src->s_blksize; + dest->st_blocks = src->s_blocks; +} + +static void dirent_convert(struct SMBW_dirent *src, struct dirent *dest) +{ + char *p; + + memset(dest, '\0', sizeof(*dest)); + dest->d_ino = src->d_ino; + dest->d_off = src->d_off; + + switch(src->d_type) + { + case SMBC_WORKGROUP: + case SMBC_SERVER: + case SMBC_FILE_SHARE: + case SMBC_DIR: + dest->d_type = DT_DIR; + break; + + case SMBC_FILE: + dest->d_type = DT_REG; + break; + + case SMBC_PRINTER_SHARE: + dest->d_type = DT_CHR; + break; + + case SMBC_COMMS_SHARE: + dest->d_type = DT_SOCK; + break; + + case SMBC_IPC_SHARE: + dest->d_type = DT_FIFO; + break; + + case SMBC_LINK: + dest->d_type = DT_LNK; + break; + } + + dest->d_reclen = src->d_reclen; + strncpy(dest->d_name, src->d_name, sizeof(dest->d_name)); + p = dest->d_name + strlen(dest->d_name) + 1; + strncpy(p, src->d_comment, sizeof(dest->d_name) - (p - dest->d_name)); +} + +static void dirent64_convert(struct SMBW_dirent *src, struct dirent64 *dest) +{ + char *p; + + memset(dest, '\0', sizeof(*dest)); + dest->d_ino = src->d_ino; + dest->d_off = src->d_off; + + switch(src->d_type) + { + case SMBC_WORKGROUP: + case SMBC_SERVER: + case SMBC_FILE_SHARE: + case SMBC_DIR: + dest->d_type = DT_DIR; + break; + + case SMBC_FILE: + dest->d_type = DT_REG; + break; + + case SMBC_PRINTER_SHARE: + dest->d_type = DT_CHR; + break; + + case SMBC_COMMS_SHARE: + dest->d_type = DT_SOCK; + break; + + case SMBC_IPC_SHARE: + dest->d_type = DT_FIFO; + break; + + case SMBC_LINK: + dest->d_type = DT_LNK; + break; + } + + dest->d_reclen = src->d_reclen; + strncpy(dest->d_name, src->d_name, sizeof(dest->d_name)); + p = dest->d_name + strlen(dest->d_name) + 1; + strncpy(p, src->d_comment, sizeof(dest->d_name) - (p - dest->d_name)); +} + +static int openx(char *name, int flags, mode_t mode, int (* f)(char *, int, mode_t)) +{ + if (smbw_path(name)) { + return smbw_open(name, flags, mode); + } + + return (* f)(name, flags, mode); +} + +static int closex(int fd, int (* f)(int fd)) +{ + if (smbw_fd(fd)) { + return smbw_close(fd); + } + + return (* f)(fd); +} + +static int fcntlx(int fd, int cmd, long arg, int (* f)(int, int, long)) +{ + if (smbw_fd(fd)) { + return smbw_fcntl(fd, cmd, arg); + } + + return (* f)(fd, cmd, arg); +} + +static int getdentsx(int fd, struct dirent *external, unsigned int count, int (* f)(int, struct dirent *, unsigned int)) +{ + if (smbw_fd(fd)) { + int i; + int internal_count; + struct SMBW_dirent *internal; + int ret; + int n; + + /* + * LIMITATION: If they pass a count which is not a multiple of + * the size of struct dirent, they will not get a partial + * structure; we ignore the excess count. + */ + n = (count / sizeof(struct dirent)); + + internal_count = sizeof(struct SMBW_dirent) * n; + internal = malloc(internal_count); + if (internal == NULL) { + errno = ENOMEM; + return -1; + } + ret = smbw_getdents(fd, internal, internal_count); + if (ret <= 0) + return ret; + + ret = sizeof(struct dirent) * n; + + for (i = 0; i < n; i++) + dirent_convert(&internal[i], &external[i]); + + return ret; + } + + return (* f)(fd, external, count); +} + +static off_t lseekx(int fd, + off_t offset, + int whence, + off_t (* f)(int, off_t, int)) +{ + off_t ret; + + /* + * We have left the definitions of the smbw_ functions undefined, + * because types such as off_t can differ in meaning betweent his + * function and smbw.c et al. Functions that return other than an + * integer value, however, MUST have their return value defined. + */ + off64_t smbw_lseek(); + + if (smbw_fd(fd)) { + return (off_t) smbw_lseek(fd, offset, whence); + } + + ret = (* f)(fd, offset, whence); + if (smbw_debug) + { + printf("lseekx(%d, 0x%llx) returned 0x%llx\n", + fd, + (unsigned long long) offset, + (unsigned long long) ret); + } + return ret; +} + +static off64_t lseek64x(int fd, + off64_t offset, + int whence, + off64_t (* f)(int, off64_t, int)) +{ + off64_t ret; + + /* + * We have left the definitions of the smbw_ functions undefined, + * because types such as off_t can differ in meaning betweent his + * function and smbw.c et al. Functions that return other than an + * integer value, however, MUST have their return value defined. + */ + off64_t smbw_lseek(); + + if (smbw_fd(fd)) + ret = smbw_lseek(fd, offset, whence); + else + ret = (* f)(fd, offset, whence); + if (smbw_debug) + { + printf("lseek64x(%d, 0x%llx) returned 0x%llx\n", + fd, + (unsigned long long) offset, + (unsigned long long) ret); + } + return ret; +} + +static ssize_t readx(int fd, void *buf, size_t count, ssize_t (* f)(int, void *, size_t)) +{ + if (smbw_fd(fd)) { + return smbw_read(fd, buf, count); + } + + return (* f)(fd, buf, count); +} + +static ssize_t writex(int fd, void *buf, size_t count, ssize_t (* f)(int, void *, size_t)) +{ + if (smbw_fd(fd)) { + return smbw_write(fd, buf, count); + } + + return (* f)(fd, buf, count); +} + + +/** + ** Wrapper Functions + **/ + +int open(__const char *name, int flags, ...) +{ + va_list ap; + mode_t mode; + + va_start(ap, flags); + mode = va_arg(ap, mode_t); + va_end(ap); + + check_init("open"); + + return openx((char *) name, flags, mode, smbw_libc.open); +} + +int _open(char *name, int flags, mode_t mode) +{ + check_init("open"); + + return openx(name, flags, mode, smbw_libc._open); +} + +int __open(char *name, int flags, mode_t mode) +{ + check_init("open"); + + return openx(name, flags, mode, smbw_libc.__open); +} + +int open64 (__const char *name, int flags, ...) +{ + va_list ap; + mode_t mode; + + va_start(ap, flags); + mode = va_arg(ap, mode_t); + va_end(ap); + + check_init("open64"); + return openx((char *) name, flags, mode, smbw_libc.open64); +} + +int _open64(char *name, int flags, mode_t mode) +{ + check_init("_open64"); + return openx(name, flags, mode, smbw_libc._open64); +} + +int __open64(char *name, int flags, mode_t mode) +{ + check_init("__open64"); + return openx(name, flags, mode, smbw_libc.__open64); +} + +ssize_t pread(int fd, void *buf, size_t size, off_t ofs) +{ + check_init("pread"); + + if (smbw_fd(fd)) { + return smbw_pread(fd, buf, size, ofs); + } + + return (* smbw_libc.pread)(fd, buf, size, ofs); +} + +ssize_t pread64(int fd, void *buf, size_t size, off64_t ofs) +{ + check_init("pread64"); + + if (smbw_fd(fd)) { + return smbw_pread(fd, buf, size, (off_t) ofs); + } + + return (* smbw_libc.pread64)(fd, buf, size, ofs); +} + +ssize_t pwrite(int fd, const void *buf, size_t size, off_t ofs) +{ + check_init("pwrite"); + + if (smbw_fd(fd)) { + return smbw_pwrite(fd, (void *) buf, size, ofs); + } + + return (* smbw_libc.pwrite)(fd, (void *) buf, size, ofs); +} + +ssize_t pwrite64(int fd, const void *buf, size_t size, off64_t ofs) +{ + check_init("pwrite64"); + + if (smbw_fd(fd)) { + return smbw_pwrite(fd, (void *) buf, size, (off_t) ofs); + } + + return (* smbw_libc.pwrite64)(fd, (void *) buf, size, ofs); +} + +int chdir(const char *name) +{ + check_init("chdir"); + return smbw_chdir((char *) name);; +} + +int __chdir(char *name) +{ + check_init("__chdir"); + return smbw_chdir(name); +} + +int _chdir(char *name) +{ + check_init("_chdir"); + return smbw_chdir(name); +} + +int close(int fd) +{ + check_init("close"); + return closex(fd, smbw_libc.close); +} + +int __close(int fd) +{ + check_init("__close"); + return closex(fd, smbw_libc.__close); +} + +int _close(int fd) +{ + check_init("_close"); + return closex(fd, smbw_libc._close); +} + +int fchdir(int fd) +{ + check_init("fchdir"); + return smbw_fchdir(fd); +} + +int __fchdir(int fd) +{ + check_init("__fchdir"); + return fchdir(fd); +} + +int _fchdir(int fd) +{ + check_init("_fchdir"); + return fchdir(fd); +} + +int fcntl (int fd, int cmd, ...) +{ + va_list ap; + long arg; + + va_start(ap, cmd); + arg = va_arg(ap, long); + va_end(ap); + + check_init("fcntl"); + return fcntlx(fd, cmd, arg, smbw_libc.fcntl); +} + +int __fcntl(int fd, int cmd, ...) +{ + va_list ap; + long arg; + + va_start(ap, cmd); + arg = va_arg(ap, long); + va_end(ap); + + check_init("__fcntl"); + return fcntlx(fd, cmd, arg, smbw_libc.__fcntl); +} + +int _fcntl(int fd, int cmd, ...) +{ + va_list ap; + long arg; + + va_start(ap, cmd); + arg = va_arg(ap, long); + va_end(ap); + + check_init("_fcntl"); + return fcntlx(fd, cmd, arg, smbw_libc._fcntl); +} + +int getdents(int fd, struct dirent *dirp, unsigned int count) +{ + check_init("getdents"); + return getdentsx(fd, dirp, count, smbw_libc.getdents); +} + +int __getdents(int fd, struct dirent *dirp, unsigned int count) +{ + check_init("__getdents"); + return getdentsx(fd, dirp, count, smbw_libc.__getdents); +} + +int _getdents(int fd, struct dirent *dirp, unsigned int count) +{ + check_init("_getdents"); + return getdentsx(fd, dirp, count, smbw_libc._getdents); +} + +int getdents64(int fd, struct dirent64 *external, unsigned int count) +{ + check_init("getdents64"); + if (smbw_fd(fd)) { + int i; + struct SMBW_dirent *internal; + int ret; + int n; + + /* + * LIMITATION: If they pass a count which is not a multiple of + * the size of struct dirent, they will not get a partial + * structure; we ignore the excess count. + */ + n = (count / sizeof(struct dirent64)); + + internal = malloc(sizeof(struct SMBW_dirent) * n); + if (internal == NULL) { + errno = ENOMEM; + return -1; + } + ret = smbw_getdents(fd, internal, count); + if (ret <= 0) + return ret; + + ret = sizeof(struct dirent) * count; + + for (i = 0; count; i++, count--) + dirent64_convert(&internal[i], &external[i]); + + return ret; + } + + return (* smbw_libc.getdents64)(fd, external, count); +} + +off_t lseek(int fd, off_t offset, int whence) +{ + off_t ret; + check_init("lseek"); + ret = lseekx(fd, offset, whence, smbw_libc.lseek); + if (smbw_debug) + { + printf("lseek(%d, 0x%llx) returned 0x%llx\n", + fd, + (unsigned long long) offset, + (unsigned long long) ret); + } + return ret; +} + +off_t __lseek(int fd, off_t offset, int whence) +{ + off_t ret; + check_init("__lseek"); + ret = lseekx(fd, offset, whence, smbw_libc.__lseek); + if (smbw_debug) + { + printf("__lseek(%d, 0x%llx) returned 0x%llx\n", + fd, + (unsigned long long) offset, + (unsigned long long) ret); + } + return ret; +} + +off_t _lseek(int fd, off_t offset, int whence) +{ + off_t ret; + check_init("_lseek"); + ret = lseekx(fd, offset, whence, smbw_libc._lseek); + if (smbw_debug) + { + printf("_lseek(%d, 0x%llx) returned 0x%llx\n", + fd, + (unsigned long long) offset, + (unsigned long long) ret); + } + return ret; +} + +off64_t lseek64(int fd, off64_t offset, int whence) +{ + off64_t ret; + check_init("lseek64"); + ret = lseek64x(fd, offset, whence, smbw_libc.lseek64); + if (smbw_debug) + { + printf("lseek64(%d, 0x%llx) returned 0x%llx\n", + fd, + (unsigned long long) offset, + (unsigned long long) ret); + } + return ret; +} + +off64_t __lseek64(int fd, off64_t offset, int whence) +{ + check_init("__lseek64"); + return lseek64x(fd, offset, whence, smbw_libc.__lseek64); +} + +off64_t _lseek64(int fd, off64_t offset, int whence) +{ + off64_t ret; + check_init("_lseek64"); + ret = lseek64x(fd, offset, whence, smbw_libc._lseek64); + if (smbw_debug) + { + printf("_lseek64(%d, 0x%llx) returned 0x%llx\n", + fd, + (unsigned long long) offset, + (unsigned long long) ret); + } + return ret; +} + +ssize_t read(int fd, void *buf, size_t count) +{ + check_init("read"); + return readx(fd, buf, count, smbw_libc.read); +} + +ssize_t __read(int fd, void *buf, size_t count) +{ + check_init("__read"); + return readx(fd, buf, count, smbw_libc.__read); +} + +ssize_t _read(int fd, void *buf, size_t count) +{ + check_init("_read"); + return readx(fd, buf, count, smbw_libc._read); +} + +ssize_t write(int fd, const void *buf, size_t count) +{ + check_init("write"); + return writex(fd, (void *) buf, count, smbw_libc.write); +} + +ssize_t __write(int fd, const void *buf, size_t count) +{ + check_init("__write"); + return writex(fd, (void *) buf, count, smbw_libc.__write); +} + +ssize_t _write(int fd, const void *buf, size_t count) +{ + check_init("_write"); + return writex(fd, (void *) buf, count, smbw_libc._write); +} + +int access(const char *name, int mode) +{ + check_init("access"); + + if (smbw_path((char *) name)) { + return smbw_access((char *) name, mode); + } + + return (* smbw_libc.access)((char *) name, mode); +} + +int chmod(const char *name, mode_t mode) +{ + check_init("chmod"); + + if (smbw_path((char *) name)) { + return smbw_chmod((char *) name, mode); + } + + return (* smbw_libc.chmod)((char *) name, mode); +} + +int fchmod(int fd, mode_t mode) +{ + check_init("fchmod"); + + if (smbw_fd(fd)) { + /* Not yet implemented in libsmbclient */ + return ENOTSUP; + } + + return (* smbw_libc.fchmod)(fd, mode); +} + +int chown(const char *name, uid_t owner, gid_t group) +{ + check_init("chown"); + + if (smbw_path((char *) name)) { + return smbw_chown((char *) name, owner, group); + } + + return (* smbw_libc.chown)((char *) name, owner, group); +} + +int fchown(int fd, uid_t owner, gid_t group) +{ + check_init("fchown"); + + if (smbw_fd(fd)) { + /* Not yet implemented in libsmbclient */ + return ENOTSUP; + } + + return (* smbw_libc.fchown)(fd, owner, group); +} + +char *getcwd(char *buf, size_t size) +{ + check_init("getcwd"); + return (char *)smbw_getcwd(buf, size); +} + +int mkdir(const char *name, mode_t mode) +{ + check_init("mkdir"); + + if (smbw_path((char *) name)) { + return smbw_mkdir((char *) name, mode); + } + + return (* smbw_libc.mkdir)((char *) name, mode); +} + +int __fxstat(int vers, int fd, struct stat *st) +{ + check_init("__fxstat"); + + if (smbw_fd(fd)) { + struct SMBW_stat statbuf; + int ret = smbw_fstat(fd, &statbuf); + stat_convert(&statbuf, st); + return ret; + } + + return (* smbw_libc.__fxstat)(vers, fd, st); +} + +int __xstat(int vers, const char *name, struct stat *st) +{ + check_init("__xstat"); + + if (smbw_path((char *) name)) { + struct SMBW_stat statbuf; + int ret = smbw_stat((char *) name, &statbuf); + stat_convert(&statbuf, st); + return ret; + } + + return (* smbw_libc.__xstat)(vers, (char *) name, st); +} + +int __lxstat(int vers, const char *name, struct stat *st) +{ + check_init("__lxstat"); + + if (smbw_path((char *) name)) { + struct SMBW_stat statbuf; + int ret = smbw_stat((char *) name, &statbuf); + stat_convert(&statbuf, st); + return ret; + } + + return (* smbw_libc.__lxstat)(vers, (char *) name, st); +} + +int stat(const char *name, struct stat *st) +{ + check_init("stat"); + + if (smbw_path((char *) name)) { + struct SMBW_stat statbuf; + int ret = smbw_stat((char *) name, &statbuf); + stat_convert(&statbuf, st); + return ret; + } + + return (* smbw_libc.stat)((char *) name, st); +} + +int lstat(const char *name, struct stat *st) +{ + check_init("lstat"); + + if (smbw_path((char *) name)) { + struct SMBW_stat statbuf; + int ret = smbw_stat((char *) name, &statbuf); + stat_convert(&statbuf, st); + return ret; + } + + return (* smbw_libc.lstat)((char *) name, st); +} + +int fstat(int fd, struct stat *st) +{ + check_init("fstat"); + + if (smbw_fd(fd)) { + struct SMBW_stat statbuf; + int ret = smbw_fstat(fd, &statbuf); + stat_convert(&statbuf, st); + return ret; + } + + return (* smbw_libc.fstat)(fd, st); +} + +int unlink(const char *name) +{ + check_init("unlink"); + + if (smbw_path((char *) name)) { + return smbw_unlink((char *) name); + } + + return (* smbw_libc.unlink)((char *) name); +} + +int utime(const char *name, const struct utimbuf *tvp) +{ + check_init("utime"); + + if (smbw_path(name)) { + return smbw_utime(name, (struct utimbuf *) tvp); + } + + return (* smbw_libc.utime)((char *) name, (struct utimbuf *) tvp); +} + +int utimes(const char *name, const struct timeval *tvp) +{ + check_init("utimes"); + + if (smbw_path(name)) { + return smbw_utimes(name, (struct timeval *) tvp); + } + + return (* smbw_libc.utimes)((char *) name, (struct timeval *) tvp); +} + +int readlink(const char *path, char *buf, size_t bufsize) +{ + check_init("readlink"); + + if (smbw_path((char *) path)) { + return smbw_readlink(path, (char *) buf, bufsize); + } + + return (* smbw_libc.readlink)((char *) path, buf, bufsize); +} + +int rename(const char *oldname, const char *newname) +{ + int p1, p2; + + check_init("rename"); + + p1 = smbw_path((char *) oldname); + p2 = smbw_path((char *) newname); + if (p1 ^ p2) { + /* can't cross filesystem boundaries */ + errno = EXDEV; + return -1; + } + if (p1 && p2) { + return smbw_rename((char *) oldname, (char *) newname); + } + + return (* smbw_libc.rename)((char *) oldname, (char *) newname); +} + +int rmdir(const char *name) +{ + check_init("rmdir"); + + if (smbw_path((char *) name)) { + return smbw_rmdir((char *) name); + } + + return (* smbw_libc.rmdir)((char *) name); +} + +int symlink(const char *topath, const char *frompath) +{ + int p1, p2; + + check_init("symlink"); + + p1 = smbw_path((char *) topath); + p2 = smbw_path((char *) frompath); + if (p1 || p2) { + /* can't handle symlinks */ + errno = EPERM; + return -1; + } + + return (* smbw_libc.symlink)((char *) topath, (char *) frompath); +} + +int dup(int fd) +{ + check_init("dup"); + + if (smbw_fd(fd)) { + return smbw_dup(fd); + } + + return (* smbw_libc.dup)(fd); +} + +int dup2(int oldfd, int newfd) +{ + check_init("dup2"); + + if (smbw_fd(newfd)) { + (* smbw_libc.close)(newfd); + } + + if (smbw_fd(oldfd)) { + return smbw_dup2(oldfd, newfd); + } + + return (* smbw_libc.dup2)(oldfd, newfd); +} + + +DIR *opendir(const char *name) +{ + check_init("opendir"); + + if (smbw_path((char *) name)) { + return (void *)smbw_opendir((char *) name); + } + + return (* smbw_libc.opendir)((char *) name); +} + +struct dirent *readdir(DIR *dir) +{ + check_init("readdir"); + + if (smbw_dirp(dir)) { + static struct dirent external; + struct SMBW_dirent * internal = (void *)smbw_readdir(dir); + if (internal != NULL) { + dirent_convert(internal, &external); + return &external; + } + return NULL; + } + return (* smbw_libc.readdir)(dir); +} + +int closedir(DIR *dir) +{ + check_init("closedir"); + + if (smbw_dirp(dir)) { + return smbw_closedir(dir); + } + + return (* smbw_libc.closedir)(dir); +} + +long telldir(DIR *dir) +{ + check_init("telldir"); + + if (smbw_dirp(dir)) { + return (long) smbw_telldir(dir); + } + + return (* smbw_libc.telldir)(dir); +} + +void seekdir(DIR *dir, long offset) +{ + check_init("seekdir"); + + if (smbw_dirp(dir)) { + smbw_seekdir(dir, (long long) offset); + return; + } + + (* smbw_libc.seekdir)(dir, offset); +} + +int creat(const char *path, mode_t mode) +{ + extern int creat_bits; + + check_init("creat"); + return openx((char *) path, creat_bits, mode, smbw_libc.open); +} + +int creat64(const char *path, mode_t mode) +{ + extern int creat_bits; + + check_init("creat64"); + return openx((char *) path, creat_bits, mode, smbw_libc.open64); +} + +int __xstat64 (int ver, const char *name, struct stat64 *st64) +{ + check_init("__xstat64"); + + if (smbw_path((char *) name)) { + struct SMBW_stat statbuf; + int ret = smbw_stat((char *) name, &statbuf); + stat64_convert(&statbuf, st64); + return ret; + } + + return (* smbw_libc.__xstat64)(ver, (char *) name, st64); +} + +int stat64(const char *name, struct stat64 *st64) +{ + check_init("stat64"); + + if (smbw_path((char *) name)) { + struct SMBW_stat statbuf; + int ret = smbw_stat((char *) name, &statbuf); + stat64_convert(&statbuf, st64); + return ret; + } + + return (* smbw_libc.stat64)((char *) name, st64); +} + +int __fxstat64(int ver, int fd, struct stat64 *st64) +{ + check_init("__fxstat64"); + + if (smbw_fd(fd)) { + struct SMBW_stat statbuf; + int ret = smbw_fstat(fd, &statbuf); + stat64_convert(&statbuf, st64); + return ret; + } + + return (* smbw_libc.__fxstat64)(ver, fd, st64); +} + +int fstat64(int fd, struct stat64 *st64) +{ + check_init("fstat64"); + + if (smbw_fd(fd)) { + struct SMBW_stat statbuf; + int ret = smbw_fstat(fd, &statbuf); + stat64_convert(&statbuf, st64); + return ret; + } + + return (* smbw_libc.fstat64)(fd, st64); +} + +int __lxstat64(int ver, const char *name, struct stat64 *st64) +{ + check_init("__lxstat64"); + + if (smbw_path((char *) name)) { + struct SMBW_stat statbuf; + int ret = smbw_stat(name, &statbuf); + stat64_convert(&statbuf, st64); + return ret; + } + + return (* smbw_libc.__lxstat64)(ver, (char *) name, st64); +} + +int lstat64(const char *name, struct stat64 *st64) +{ + check_init("lstat64"); + + if (smbw_path((char *) name)) { + struct SMBW_stat statbuf; + int ret = smbw_stat((char *) name, &statbuf); + stat64_convert(&statbuf, st64); + return ret; + } + + return (* smbw_libc.lstat64)((char *) name, st64); +} + +int _llseek(unsigned int fd, unsigned long offset_high, unsigned long offset_low, loff_t *result, unsigned int whence) +{ + check_init("_llseek"); + + if (smbw_fd(fd)) { + *result = lseek(fd, offset_low, whence); + return (*result < 0 ? -1 : 0); + } + + return (* smbw_libc._llseek)(fd, offset_high, offset_low, result, whence); +} + +struct dirent64 *readdir64(DIR *dir) +{ + check_init("readdir64"); + + if (smbw_dirp(dir)) { + static struct dirent64 external; + struct SMBW_dirent * internal = (void *)smbw_readdir(dir); + if (internal != NULL) { + dirent64_convert(internal, &external); + return &external; + } + return NULL; + } + + return (* smbw_libc.readdir64)(dir); +} + +int readdir_r(DIR *dir, struct dirent *external, struct dirent **result) +{ + check_init("readdir_r"); + + if (smbw_dirp(dir)) { + struct SMBW_dirent internal; + int ret = smbw_readdir_r(dir, &internal, NULL); + if (ret == 0) { + dirent_convert(&internal, external); + *result = external; + } + return ret; + } + + return (* smbw_libc.readdir_r)(dir, external, result); +} + +int readdir64_r(DIR *dir, struct dirent64 *external, struct dirent64 **result) +{ + check_init("readdir64_r"); + + if (smbw_dirp(dir)) { + struct SMBW_dirent internal; + int ret = smbw_readdir_r(dir, &internal, NULL); + if (ret == 0) { + dirent64_convert(&internal, external); + *result = external; + } + return ret; + } + + return (* smbw_libc.readdir64_r)(dir, external, result); +} + +int fork(void) +{ + check_init("fork"); + return smbw_fork(); +} + +int setxattr(const char *fname, + const char *name, + const void *value, + size_t size, + int flags) +{ + if (smbw_path(fname)) { + return smbw_setxattr(fname, name, value, size, flags); + } + + return (* smbw_libc.setxattr)(fname, name, value, size, flags); +} + +int lsetxattr(const char *fname, + const char *name, + const void *value, + size_t size, + int flags) +{ + if (smbw_path(fname)) { + return smbw_lsetxattr(fname, name, value, size, flags); + } + + return (* smbw_libc.lsetxattr)(fname, name, value, size, flags); +} + +int fsetxattr(int fd, + const char *name, + const void *value, + size_t size, + int flags) +{ + if (smbw_fd(fd)) { + return smbw_fsetxattr(fd, name, value, size, flags); + } + + return (* smbw_libc.fsetxattr)(fd, name, value, size, flags); +} + +int getxattr(const char *fname, + const char *name, + const void *value, + size_t size) +{ + if (smbw_path(fname)) { + return smbw_getxattr(fname, name, value, size); + } + + return (* smbw_libc.getxattr)(fname, name, value, size); +} + +int lgetxattr(const char *fname, + const char *name, + const void *value, + size_t size) +{ + if (smbw_path(fname)) { + return smbw_lgetxattr(fname, name, value, size); + } + + return (* smbw_libc.lgetxattr)(fname, name, value, size); +} + +int fgetxattr(int fd, + const char *name, + const void *value, + size_t size) +{ + if (smbw_fd(fd)) { + return smbw_fgetxattr(fd, name, value, size); + } + + return (* smbw_libc.fgetxattr)(fd, name, value, size); +} + +int removexattr(const char *fname, + const char *name) +{ + if (smbw_path(fname)) { + return smbw_removexattr(fname, name); + } + + return (* smbw_libc.removexattr)(fname, name); +} + +int lremovexattr(const char *fname, + const char *name) +{ + if (smbw_path(fname)) { + return smbw_lremovexattr(fname, name); + } + + return (* smbw_libc.lremovexattr)(fname, name); +} + +int fremovexattr(int fd, + const char *name) +{ + if (smbw_fd(fd)) { + return smbw_fremovexattr(fd, name); + } + + return (* smbw_libc.fremovexattr)(fd, name); +} + +int listxattr(const char *fname, + char *list, + size_t size) +{ + if (smbw_path(fname)) { + return smbw_listxattr(fname, list, size); + } + + return (* smbw_libc.listxattr)(fname, list, size); +} + +int llistxattr(const char *fname, + char *list, + size_t size) +{ + if (smbw_path(fname)) { + return smbw_llistxattr(fname, list, size); + } + + return (* smbw_libc.llistxattr)(fname, list, size); +} + +int flistxattr(int fd, + char *list, + size_t size) +{ + if (smbw_fd(fd)) { + return smbw_flistxattr(fd, list, size); + } + + return (* smbw_libc.flistxattr)(fd, list, size); +} + + +/* + * We're ending up with a different implementation of malloc() with smbwrapper + * than without it. The one with it does not support returning a non-NULL + * pointer from a call to malloc(0), and many apps depend on getting a valid + * pointer when requesting zero length (e.g. df, emacs). + * + * Unfortunately, initializing the smbw_libc[] array via the dynamic link + * library (libdl) requires malloc so we can't just do the same type of + * mapping to the C library as we do with everything else. We need to + * implement a different way of allocating memory that ensures that the C + * library version of malloc() gets used. This is the only place where we + * kludge the code to use an undocumented interface to the C library. + * + * If anyone can come up with a way to dynamically link to the C library + * rather than using this undocumented interface, I'd sure love to hear about + * it. Better yet, if you can figure out where the alternate malloc() + * functions are coming from and arrange for them not to be called, that would + * be even better. We should try to avoid wrapping functions that don't + * really require it. + */ + +void *malloc(size_t size) +{ + void *__libc_malloc(size_t size); + return __libc_malloc(size); +} + +void *calloc(size_t nmemb, size_t size) +{ + void *__libc_calloc(size_t nmemb, size_t size); + return __libc_calloc(nmemb, size); +} + +void *realloc(void *ptr, size_t size) +{ + void *__libc_realloc(void *ptr, size_t size); + return __libc_realloc(ptr, size); +} + +void free(void *ptr) +{ + static int in_progress = 0; + void __libc_free(void *ptr); + + if (in_progress) return; + in_progress = 1; + __libc_free(ptr); + in_progress = 0; +} + + +#if 0 /* SELECT */ + +static struct sigaction user_action[_NSIG]; + +static void +smbw_sigaction_handler(int signum, + siginfo_t *info, + void *context) +{ + /* Our entire purpose for trapping signals is to call this! */ + sys_select_signal(); + + /* Call the user's handler */ + if (user_action[signum].sa_handler != SIG_IGN && + user_action[signum].sa_handler != SIG_DFL && + user_action[signum].sa_handler != SIG_ERR) { + (* user_action[signum].sa_sigaction)(signum, info, context); + } +} + + +/* + * Every Samba signal handler must call sys_select_signal() to avoid a race + * condition, so we'll take whatever signal handler is currently assigned, + * call call sys_select_signal() in addition to their call. + */ +static int +do_select(int n, + fd_set *readfds, + fd_set *writefds, + fd_set *exceptfds, + struct timeval *timeout, + int (* select_fn)(int n, + fd_set *readfds, + fd_set *writefds, + fd_set *exceptfds, + struct timeval *timeout)) +{ + int i; + int ret; + int saved_errno; + sigset_t sigset; + struct sigaction new_action; + + saved_errno = errno; + for (i=1; i<_NSIG; i++) { + sigemptyset(&sigset); + new_action.sa_mask = sigset; + new_action.sa_flags = SA_SIGINFO; + new_action.sa_sigaction = smbw_sigaction_handler; + + if (sigaction(i, &new_action, &user_action[i]) < 0) { + if (errno != EINVAL) { + return -1; + } + } + } + errno = saved_errno; + + ret = (* select_fn)(n, readfds, writefds, exceptfds, timeout); + saved_errno = errno; + + for (i=0; i<_NSIG; i++) { + (void) sigaction(i, &user_action[i], NULL); + } + + errno = saved_errno; + return ret; +} + +int +select(int n, + fd_set *readfds, + fd_set *writefds, + fd_set *exceptfds, + struct timeval *timeout) +{ + check_init("select"); + + return do_select(n, readfds, writefds, exceptfds, + timeout, smbw_libc.select); +} + +int +_select(int n, + fd_set *readfds, + fd_set *writefds, + fd_set *exceptfds, + struct timeval *timeout) +{ + check_init("_select"); + + return do_select(n, readfds, writefds, exceptfds, + timeout, smbw_libc._select); +} + +int +__select(int n, + fd_set *readfds, + fd_set *writefds, + fd_set *exceptfds, + struct timeval *timeout) +{ + check_init("__select"); + + return do_select(n, readfds, writefds, exceptfds, + timeout, smbw_libc.__select); +} + +#endif |