mirror of https://github.com/trapexit/mergerfs.git
trapexit
11 months ago
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11 changed files with 602 additions and 54 deletions
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97.cirrus.yml
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2LICENSE
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29Makefile
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46README.md
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0buildtools/create-branches
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0buildtools/git2debcl
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0buildtools/install-build-pkgs
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0buildtools/update-version
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52man/mergerfs.1
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1mergerfs.spec
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427tools/preload.c
@ -0,0 +1,427 @@ |
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/* |
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ISC License |
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|
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Copyright (c) 2024, Antonio SJ Musumeci <trapexit@spawn.link> |
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|
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Permission to use, copy, modify, and/or distribute this software for any |
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purpose with or without fee is hereby granted, provided that the above |
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copyright notice and this permission notice appear in all copies. |
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|
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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|
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#define _GNU_SOURCE |
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#define _POSIX_C_SOURCE 200809L |
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|
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#include <assert.h> |
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#include <dlfcn.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <sys/ioctl.h> |
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#include <stdarg.h> |
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#include <sys/stat.h> |
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#include <sys/types.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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|
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typedef char IOCTL_BUF[4096]; |
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#define IOCTL_APP_TYPE 0xDF |
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#define IOCTL_FILE_INFO _IOWR(IOCTL_APP_TYPE,0,IOCTL_BUF) |
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|
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#define LOAD_FUNC(func) \ |
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do \ |
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{ \ |
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if(!_libc_##func) \ |
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_libc_##func = (func##_func_t)dlsym(RTLD_NEXT,#func); \ |
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assert(_libc_##func != NULL); \ |
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} \ |
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while(0) |
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|
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typedef int (*open_func_t)(const char*, int, ...); |
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typedef int (*open64_func_t)(const char*, int, ...); |
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typedef int (*openat_func_t)(int, const char*, int, ...); |
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typedef int (*openat64_func_t)(int, const char*, int, ...); |
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typedef int (*creat_func_t)(const char*, mode_t); |
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typedef int (*creat64_func_t)(const char*, mode_t); |
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typedef FILE* (*fopen_func_t)(const char*, const char*); |
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typedef FILE* (*fopen64_func_t)(const char*, const char*); |
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|
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static open_func_t _libc_open = NULL; |
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static open64_func_t _libc_open64 = NULL; |
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static openat_func_t _libc_openat = NULL; |
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static openat64_func_t _libc_openat64 = NULL; |
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static fopen_func_t _libc_fopen = NULL; |
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static fopen64_func_t _libc_fopen64 = NULL; |
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static creat_func_t _libc_creat = NULL; |
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static creat64_func_t _libc_creat64 = NULL; |
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|
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static |
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int |
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get_underlying_filepath(int fd_, |
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char *filepath_) |
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{ |
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int rv; |
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|
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strcpy(filepath_,"fullpath"); |
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rv = ioctl(fd_,IOCTL_FILE_INFO,filepath_); |
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if(rv == -1) |
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return -1; |
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|
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return rv; |
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} |
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|
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static |
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void |
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strip_exec(const char *orig_mode_, |
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char *new_mode_) |
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{ |
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size_t i; |
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size_t j; |
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|
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for(i = j = 0; orig_mode_[i]; i++) |
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{ |
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if(orig_mode_[i] == 'x') |
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continue; |
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new_mode_[j++] = orig_mode_[i]; |
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} |
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|
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new_mode_[j] = '\0'; |
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} |
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|
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int |
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open(const char *pathname_, |
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int flags_, |
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...) |
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{ |
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int rv; |
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int fd; |
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mode_t mode; |
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struct stat st; |
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|
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LOAD_FUNC(open); |
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|
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mode = 0; |
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if(flags_ & O_CREAT) |
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{ |
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va_list args; |
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va_start(args,flags_); |
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mode = va_arg(args,mode_t); |
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va_end(args); |
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} |
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|
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fd = _libc_open(pathname_,flags_,mode); |
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if(fd == -1) |
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return -1; |
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|
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if(flags_ & (O_DIRECTORY|O_PATH)) |
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return fd; |
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rv = fstat(fd,&st); |
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if(rv == -1) |
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return fd; |
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if((st.st_mode & S_IFMT) != S_IFREG) |
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return fd; |
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|
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IOCTL_BUF real_pathname; |
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rv = get_underlying_filepath(fd,real_pathname); |
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if(rv == -1) |
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return fd; |
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|
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flags_ &= ~(O_EXCL|O_CREAT); |
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rv = _libc_open(real_pathname,flags_,mode); |
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if(rv == -1) |
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return fd; |
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|
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close(fd); |
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|
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return rv; |
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} |
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|
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int |
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open64(const char *pathname_, |
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int flags_, |
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...) |
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{ |
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int rv; |
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int fd; |
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mode_t mode; |
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struct stat st; |
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|
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LOAD_FUNC(open64); |
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|
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mode = 0; |
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if(flags_ & O_CREAT) |
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{ |
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va_list args; |
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va_start(args,flags_); |
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mode = va_arg(args,mode_t); |
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va_end(args); |
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} |
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|
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fd = _libc_open64(pathname_,flags_,mode); |
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if(fd == -1) |
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return -1; |
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|
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if(flags_ & (O_DIRECTORY|O_PATH)) |
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return fd; |
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rv = fstat(fd,&st); |
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if(rv == -1) |
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return fd; |
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if((st.st_mode & S_IFMT) != S_IFREG) |
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return fd; |
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|
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IOCTL_BUF real_pathname; |
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rv = get_underlying_filepath(fd,real_pathname); |
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if(rv == -1) |
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return fd; |
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|
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flags_ &= ~(O_EXCL|O_CREAT); |
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rv = _libc_open64(real_pathname,flags_,mode); |
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if(rv == -1) |
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return fd; |
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|
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close(fd); |
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|
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return rv; |
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} |
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|
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int |
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openat(int dirfd_, |
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const char *pathname_, |
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int flags_, |
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...) |
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{ |
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int rv; |
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int fd; |
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mode_t mode; |
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struct stat st; |
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|
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LOAD_FUNC(openat); |
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mode = 0; |
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if(flags_ & O_CREAT) |
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{ |
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va_list args; |
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va_start(args,flags_); |
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mode = va_arg(args,mode_t); |
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va_end(args); |
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} |
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|
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fd = _libc_openat(dirfd_,pathname_,flags_,mode); |
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if(fd == -1) |
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return -1; |
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|
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if(flags_ & (O_DIRECTORY|O_PATH)) |
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return fd; |
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rv = fstat(fd,&st); |
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if(rv == -1) |
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return fd; |
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if((st.st_mode & S_IFMT) != S_IFREG) |
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return fd; |
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|
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IOCTL_BUF real_pathname; |
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rv = get_underlying_filepath(fd,real_pathname); |
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if(rv == -1) |
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return fd; |
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|
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flags_ &= ~(O_EXCL|O_CREAT); |
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rv = _libc_openat(dirfd_,real_pathname,flags_,mode); |
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if(rv == -1) |
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return fd; |
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|
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close(fd); |
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|
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return rv; |
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} |
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|
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int |
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openat64(int dirfd_, |
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const char *pathname_, |
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int flags_, |
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...) |
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{ |
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int rv; |
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int fd; |
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mode_t mode; |
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struct stat st; |
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LOAD_FUNC(openat64); |
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mode = 0; |
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if(flags_ & O_CREAT) |
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{ |
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va_list args; |
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va_start(args,flags_); |
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mode = va_arg(args,mode_t); |
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va_end(args); |
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} |
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fd = _libc_openat64(dirfd_,pathname_,flags_,mode); |
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if(fd == -1) |
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return -1; |
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|
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if(flags_ & (O_DIRECTORY|O_PATH)) |
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return fd; |
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rv = fstat(fd,&st); |
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if(rv == -1) |
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return fd; |
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if((st.st_mode & S_IFMT) != S_IFREG) |
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return fd; |
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|
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IOCTL_BUF real_pathname; |
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rv = get_underlying_filepath(fd,real_pathname); |
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if(rv == -1) |
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return fd; |
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|
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flags_ &= ~(O_EXCL|O_CREAT); |
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rv = _libc_openat64(dirfd_,real_pathname,flags_,mode); |
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if(rv == -1) |
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return fd; |
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|
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close(fd); |
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|
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return rv; |
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} |
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|
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FILE* |
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fopen(const char *pathname_, |
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const char *mode_) |
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{ |
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int fd; |
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int rv; |
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FILE *f; |
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FILE *f2; |
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struct stat st; |
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|
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LOAD_FUNC(fopen); |
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|
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f = _libc_fopen(pathname_,mode_); |
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if(f == NULL) |
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return NULL; |
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|
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fd = fileno(f); |
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if(fd == -1) |
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return f; |
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|
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rv = fstat(fd,&st); |
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if(rv == -1) |
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return f; |
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if((st.st_mode & S_IFMT) != S_IFREG) |
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return f; |
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|
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IOCTL_BUF real_pathname; |
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rv = get_underlying_filepath(fd,real_pathname); |
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if(rv == -1) |
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return f; |
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|
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char new_mode[64]; |
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strip_exec(mode_,new_mode); |
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f2 = _libc_fopen(real_pathname,new_mode); |
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if(f2 == NULL) |
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return f; |
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|
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fclose(f); |
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|
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return f2; |
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} |
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|
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FILE* |
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fopen64(const char *pathname_, |
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const char *mode_) |
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{ |
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int fd; |
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int rv; |
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FILE *f; |
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FILE *f2; |
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struct stat st; |
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|
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LOAD_FUNC(fopen64); |
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|
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f = _libc_fopen64(pathname_,mode_); |
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if(f == NULL) |
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return NULL; |
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|
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fd = fileno(f); |
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if(fd == -1) |
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return f; |
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|
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rv = fstat(fd,&st); |
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if(rv == -1) |
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return f; |
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if((st.st_mode & S_IFMT) != S_IFREG) |
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return f; |
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|
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IOCTL_BUF real_pathname; |
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rv = get_underlying_filepath(fd,real_pathname); |
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if(rv == -1) |
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return f; |
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|
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char new_mode[64]; |
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strip_exec(mode_,new_mode); |
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f2 = _libc_fopen64(real_pathname,new_mode); |
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if(f2 == NULL) |
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return f; |
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|
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fclose(f); |
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|
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return f2; |
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} |
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|
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int |
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creat(const char *pathname_, |
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mode_t mode_) |
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{ |
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int fd; |
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int rv; |
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LOAD_FUNC(creat); |
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fd = _libc_creat(pathname_,mode_); |
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if(fd == -1) |
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return -1; |
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|
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IOCTL_BUF real_pathname; |
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rv = get_underlying_filepath(fd,real_pathname); |
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if(rv == -1) |
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return fd; |
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|
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rv = _libc_creat(real_pathname,mode_); |
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if(rv == -1) |
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return fd; |
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|
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close(fd); |
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|
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return rv; |
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} |
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|
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int |
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creat64(const char *pathname_, |
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mode_t mode_) |
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{ |
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int fd; |
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int rv; |
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LOAD_FUNC(creat64); |
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|
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fd = _libc_creat64(pathname_,mode_); |
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if(fd == -1) |
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return -1; |
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|
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IOCTL_BUF real_pathname; |
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rv = get_underlying_filepath(fd,real_pathname); |
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if(rv == -1) |
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return fd; |
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|
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rv = _libc_creat64(real_pathname,mode_); |
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if(rv == -1) |
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return fd; |
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|
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close(fd); |
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|
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return rv; |
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} |
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