| /* |
| FUSE: Filesystem in Userspace |
| Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu> |
| |
| This program can be distributed under the terms of the GNU LGPL. |
| See the file COPYING.LIB |
| */ |
| |
| #include <config.h> |
| #include "fuse_lowlevel.h" |
| #include "fuse_kernel.h" |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <limits.h> |
| #include <errno.h> |
| #include <stdint.h> |
| |
| #define PARAM(inarg) (((char *)(inarg)) + sizeof(*(inarg))) |
| |
| struct fuse_ll { |
| unsigned int debug : 1; |
| unsigned int allow_root : 1; |
| struct fuse_lowlevel_ops op; |
| int got_init; |
| void *userdata; |
| int major; |
| int minor; |
| uid_t owner; |
| }; |
| |
| struct fuse_req { |
| struct fuse_ll *f; |
| uint64_t unique; |
| struct fuse_ctx ctx; |
| struct fuse_chan *ch; |
| }; |
| |
| static const char *opname(enum fuse_opcode opcode) |
| { |
| switch (opcode) { |
| case FUSE_LOOKUP: return "LOOKUP"; |
| case FUSE_FORGET: return "FORGET"; |
| case FUSE_GETATTR: return "GETATTR"; |
| case FUSE_SETATTR: return "SETATTR"; |
| case FUSE_READLINK: return "READLINK"; |
| case FUSE_SYMLINK: return "SYMLINK"; |
| case FUSE_MKNOD: return "MKNOD"; |
| case FUSE_MKDIR: return "MKDIR"; |
| case FUSE_UNLINK: return "UNLINK"; |
| case FUSE_RMDIR: return "RMDIR"; |
| case FUSE_RENAME: return "RENAME"; |
| case FUSE_LINK: return "LINK"; |
| case FUSE_OPEN: return "OPEN"; |
| case FUSE_READ: return "READ"; |
| case FUSE_WRITE: return "WRITE"; |
| case FUSE_STATFS: return "STATFS"; |
| case FUSE_FLUSH: return "FLUSH"; |
| case FUSE_RELEASE: return "RELEASE"; |
| case FUSE_FSYNC: return "FSYNC"; |
| case FUSE_SETXATTR: return "SETXATTR"; |
| case FUSE_GETXATTR: return "GETXATTR"; |
| case FUSE_LISTXATTR: return "LISTXATTR"; |
| case FUSE_REMOVEXATTR: return "REMOVEXATTR"; |
| case FUSE_INIT: return "INIT"; |
| case FUSE_OPENDIR: return "OPENDIR"; |
| case FUSE_READDIR: return "READDIR"; |
| case FUSE_RELEASEDIR: return "RELEASEDIR"; |
| case FUSE_FSYNCDIR: return "FSYNCDIR"; |
| case FUSE_GETLK: return "GETLK"; |
| case FUSE_SETLK: return "SETLK"; |
| case FUSE_SETLKW: return "SETLKW"; |
| case FUSE_ACCESS: return "ACCESS"; |
| default: return "???"; |
| } |
| } |
| |
| static void convert_stat(const struct stat *stbuf, struct fuse_attr *attr) |
| { |
| attr->ino = stbuf->st_ino; |
| attr->mode = stbuf->st_mode; |
| attr->nlink = stbuf->st_nlink; |
| attr->uid = stbuf->st_uid; |
| attr->gid = stbuf->st_gid; |
| attr->rdev = stbuf->st_rdev; |
| attr->size = stbuf->st_size; |
| attr->blocks = stbuf->st_blocks; |
| attr->atime = stbuf->st_atime; |
| attr->mtime = stbuf->st_mtime; |
| attr->ctime = stbuf->st_ctime; |
| #ifdef HAVE_STRUCT_STAT_ST_ATIM |
| attr->atimensec = stbuf->st_atim.tv_nsec; |
| attr->mtimensec = stbuf->st_mtim.tv_nsec; |
| attr->ctimensec = stbuf->st_ctim.tv_nsec; |
| #endif |
| } |
| |
| static void convert_attr(const struct fuse_attr *attr, struct stat *stbuf) |
| { |
| stbuf->st_mode = attr->mode; |
| stbuf->st_uid = attr->uid; |
| stbuf->st_gid = attr->gid; |
| stbuf->st_size = attr->size; |
| stbuf->st_atime = attr->atime; |
| stbuf->st_mtime = attr->mtime; |
| stbuf->st_ctime = attr->ctime; |
| #ifdef HAVE_STRUCT_STAT_ST_ATIM |
| stbuf->st_atim.tv_nsec = attr->atimensec; |
| stbuf->st_mtim.tv_nsec = attr->mtimensec; |
| stbuf->st_ctim.tv_nsec = attr->ctimensec; |
| #endif |
| } |
| |
| static void convert_file_lock(const struct fuse_file_lock *ffl, |
| struct fuse_lock_param *lk) |
| { |
| lk->type = ffl->type; |
| lk->start = ffl->start; |
| lk->end = ffl->end; |
| lk->owner = ffl->owner; |
| lk->pid = ffl->pid; |
| } |
| |
| static void convert_lock_param(const struct fuse_lock_param *lk, |
| struct fuse_file_lock *ffl) |
| { |
| ffl->type = lk->type; |
| ffl->start = lk->start; |
| ffl->end = lk->end; |
| ffl->owner = lk->owner; |
| ffl->pid = lk->pid; |
| } |
| |
| static size_t iov_length(const struct iovec *iov, size_t count) |
| { |
| size_t seg; |
| size_t ret = 0; |
| |
| for (seg = 0; seg < count; seg++) |
| ret += iov[seg].iov_len; |
| return ret; |
| } |
| |
| static void free_req(fuse_req_t req) |
| { |
| free(req); |
| } |
| |
| static int send_reply(fuse_req_t req, int error, const void *arg, |
| size_t argsize) |
| { |
| struct fuse_out_header out; |
| struct iovec iov[2]; |
| size_t count; |
| int res; |
| |
| if (error <= -1000 || error > 0) { |
| fprintf(stderr, "fuse: bad error value: %i\n", error); |
| error = -ERANGE; |
| } |
| |
| out.unique = req->unique; |
| out.error = error; |
| count = 1; |
| iov[0].iov_base = &out; |
| iov[0].iov_len = sizeof(struct fuse_out_header); |
| if (argsize && !error) { |
| count++; |
| iov[1].iov_base = (void *) arg; |
| iov[1].iov_len = argsize; |
| } |
| out.len = iov_length(iov, count); |
| |
| if (req->f->debug) { |
| printf(" unique: %llu, error: %i (%s), outsize: %i\n", |
| out.unique, out.error, strerror(-out.error), out.len); |
| fflush(stdout); |
| } |
| res = fuse_chan_send(req->ch, iov, count); |
| free_req(req); |
| |
| return res; |
| } |
| |
| size_t fuse_dirent_size(size_t namelen) |
| { |
| return FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + namelen); |
| } |
| |
| char *fuse_add_dirent(char *buf, const char *name, const struct stat *stbuf, |
| off_t off) |
| { |
| unsigned namelen = strlen(name); |
| unsigned entlen = FUSE_NAME_OFFSET + namelen; |
| unsigned entsize = fuse_dirent_size(namelen); |
| unsigned padlen = entsize - entlen; |
| struct fuse_dirent *dirent = (struct fuse_dirent *) buf; |
| |
| dirent->ino = stbuf->st_ino; |
| dirent->off = off; |
| dirent->namelen = namelen; |
| dirent->type = (stbuf->st_mode & 0170000) >> 12; |
| strncpy(dirent->name, name, namelen); |
| if (padlen) |
| memset(buf + entlen, 0, padlen); |
| |
| return buf + entsize; |
| } |
| |
| static void convert_statfs(const struct statfs *stbuf, |
| struct fuse_kstatfs *kstatfs) |
| { |
| kstatfs->bsize = stbuf->f_bsize; |
| kstatfs->blocks = stbuf->f_blocks; |
| kstatfs->bfree = stbuf->f_bfree; |
| kstatfs->bavail = stbuf->f_bavail; |
| kstatfs->files = stbuf->f_files; |
| kstatfs->ffree = stbuf->f_ffree; |
| kstatfs->namelen = stbuf->f_namelen; |
| } |
| |
| static int send_reply_ok(fuse_req_t req, const void *arg, size_t argsize) |
| { |
| return send_reply(req, 0, arg, argsize); |
| } |
| |
| int fuse_reply_err(fuse_req_t req, int err) |
| { |
| return send_reply(req, -err, NULL, 0); |
| } |
| |
| int fuse_reply_none(fuse_req_t req) |
| { |
| free_req(req); |
| return 0; |
| } |
| |
| static unsigned long calc_timeout_sec(double t) |
| { |
| if (t > (double) ULONG_MAX) |
| return ULONG_MAX; |
| else if (t < 0.0) |
| return 0; |
| else |
| return (unsigned long) t; |
| } |
| |
| static unsigned int calc_timeout_nsec(double t) |
| { |
| double f = t - (double) calc_timeout_sec(t); |
| if (f < 0.0) |
| return 0; |
| else if (f >= 0.999999999) |
| return 999999999; |
| else |
| return (unsigned int) (f * 1.0e9); |
| } |
| |
| int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e) |
| { |
| struct fuse_entry_out arg; |
| |
| memset(&arg, 0, sizeof(arg)); |
| arg.nodeid = e->ino; |
| arg.generation = e->generation; |
| arg.entry_valid = calc_timeout_sec(e->entry_timeout); |
| arg.entry_valid_nsec = calc_timeout_nsec(e->entry_timeout); |
| arg.attr_valid = calc_timeout_sec(e->attr_timeout); |
| arg.attr_valid_nsec = calc_timeout_nsec(e->attr_timeout); |
| convert_stat(&e->attr, &arg.attr); |
| |
| return send_reply_ok(req, &arg, sizeof(arg)); |
| } |
| |
| int fuse_reply_attr(fuse_req_t req, const struct stat *attr, |
| double attr_timeout) |
| { |
| struct fuse_attr_out arg; |
| |
| memset(&arg, 0, sizeof(arg)); |
| arg.attr_valid = calc_timeout_sec(attr_timeout); |
| arg.attr_valid_nsec = calc_timeout_nsec(attr_timeout); |
| convert_stat(attr, &arg.attr); |
| |
| return send_reply_ok(req, &arg, sizeof(arg)); |
| } |
| |
| int fuse_reply_readlink(fuse_req_t req, const char *linkname) |
| { |
| return send_reply_ok(req, linkname, strlen(linkname)); |
| } |
| |
| int fuse_reply_open(fuse_req_t req, const struct fuse_file_info *f) |
| { |
| struct fuse_open_out arg; |
| |
| memset(&arg, 0, sizeof(arg)); |
| arg.fh = f->fh; |
| if (f->direct_io) |
| arg.open_flags |= FOPEN_DIRECT_IO; |
| if (f->keep_cache) |
| arg.open_flags |= FOPEN_KEEP_CACHE; |
| |
| return send_reply_ok(req, &arg, sizeof(arg)); |
| } |
| |
| int fuse_reply_write(fuse_req_t req, size_t count) |
| { |
| struct fuse_write_out arg; |
| |
| memset(&arg, 0, sizeof(arg)); |
| arg.size = count; |
| |
| return send_reply_ok(req, &arg, sizeof(arg)); |
| } |
| |
| int fuse_reply_buf(fuse_req_t req, const char *buf, size_t size) |
| { |
| return send_reply_ok(req, buf, size); |
| } |
| |
| int fuse_reply_statfs(fuse_req_t req, const struct statfs *stbuf) |
| { |
| struct fuse_statfs_out arg; |
| |
| memset(&arg, 0, sizeof(arg)); |
| convert_statfs(stbuf, &arg.st); |
| |
| return send_reply_ok(req, &arg, sizeof(arg)); |
| } |
| |
| int fuse_reply_xattr(fuse_req_t req, size_t count) |
| { |
| struct fuse_getxattr_out arg; |
| |
| memset(&arg, 0, sizeof(arg)); |
| arg.size = count; |
| |
| return send_reply_ok(req, &arg, sizeof(arg)); |
| } |
| |
| int fuse_reply_getlk(fuse_req_t req, const struct fuse_lock_param *lk) |
| { |
| struct fuse_lk_in_out arg; |
| |
| memset(&arg, 0, sizeof(arg)); |
| convert_lock_param(lk, &arg.lk); |
| |
| return send_reply_ok(req, &arg, sizeof(arg)); |
| } |
| |
| static void do_lookup(fuse_req_t req, fuse_ino_t nodeid, char *name) |
| { |
| if (req->f->op.lookup) |
| req->f->op.lookup(req, nodeid, name); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_forget(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_forget_in *arg) |
| { |
| if (req->f->op.forget) |
| req->f->op.forget(req, nodeid, arg->nlookup); |
| } |
| |
| static void do_getattr(fuse_req_t req, fuse_ino_t nodeid) |
| { |
| if (req->f->op.getattr) |
| req->f->op.getattr(req, nodeid); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_setattr(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_setattr_in *arg) |
| { |
| if (req->f->op.setattr) { |
| struct stat stbuf; |
| memset(&stbuf, 0, sizeof(stbuf)); |
| convert_attr(&arg->attr, &stbuf); |
| req->f->op.setattr(req, nodeid, &stbuf, arg->valid); |
| } else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_access(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_access_in *arg) |
| { |
| if (req->f->op.access) |
| req->f->op.access(req, nodeid, arg->mask); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| static void do_readlink(fuse_req_t req, fuse_ino_t nodeid) |
| { |
| if (req->f->op.readlink) |
| req->f->op.readlink(req, nodeid); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_mknod(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_mknod_in *arg) |
| { |
| if (req->f->op.mknod) |
| req->f->op.mknod(req, nodeid, PARAM(arg), arg->mode, arg->rdev); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_mkdir(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_mkdir_in *arg) |
| { |
| if (req->f->op.mkdir) |
| req->f->op.mkdir(req, nodeid, PARAM(arg), arg->mode); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_unlink(fuse_req_t req, fuse_ino_t nodeid, char *name) |
| { |
| if (req->f->op.unlink) |
| req->f->op.unlink(req, nodeid, name); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_rmdir(fuse_req_t req, fuse_ino_t nodeid, char *name) |
| { |
| if (req->f->op.rmdir) |
| req->f->op.rmdir(req, nodeid, name); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_symlink(fuse_req_t req, fuse_ino_t nodeid, char *name, |
| char *linkname) |
| { |
| if (req->f->op.symlink) |
| req->f->op.symlink(req, linkname, nodeid, name); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_rename(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_rename_in *arg) |
| { |
| char *oldname = PARAM(arg); |
| char *newname = oldname + strlen(oldname) + 1; |
| |
| if (req->f->op.rename) |
| req->f->op.rename(req, nodeid, oldname, arg->newdir, newname); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_link(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_link_in *arg) |
| { |
| if (req->f->op.link) |
| req->f->op.link(req, arg->oldnodeid, nodeid, PARAM(arg)); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_open(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_open_in *arg) |
| { |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.flags = arg->flags; |
| |
| if (req->f->op.open) |
| req->f->op.open(req, nodeid, &fi); |
| else |
| fuse_reply_open(req, &fi); |
| } |
| |
| static void do_read(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_read_in *arg) |
| { |
| if (req->f->op.read) { |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| req->f->op.read(req, nodeid, arg->size, arg->offset, &fi); |
| } else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_write(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_write_in *arg) |
| { |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| fi.writepage = arg->write_flags & 1; |
| |
| if (req->f->op.write) |
| req->f->op.write(req, nodeid, PARAM(arg), arg->size, |
| arg->offset, &fi); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_flush(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_flush_in *arg) |
| { |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| |
| if (req->f->op.flush) |
| req->f->op.flush(req, nodeid, &fi); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_release(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_release_in *arg) |
| { |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.flags = arg->flags; |
| fi.fh = arg->fh; |
| |
| if (req->f->op.release) |
| req->f->op.release(req, nodeid, &fi); |
| else |
| fuse_reply_err(req, 0); |
| } |
| |
| static void do_fsync(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_fsync_in *inarg) |
| { |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = inarg->fh; |
| |
| if (req->f->op.fsync) |
| req->f->op.fsync(req, nodeid, inarg->fsync_flags & 1, &fi); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_opendir(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_open_in *arg) |
| { |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.flags = arg->flags; |
| |
| if (req->f->op.opendir) |
| req->f->op.opendir(req, nodeid, &fi); |
| else |
| fuse_reply_open(req, &fi); |
| } |
| |
| static void do_readdir(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_read_in *arg) |
| { |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| |
| if (req->f->op.readdir) |
| req->f->op.readdir(req, nodeid, arg->size, arg->offset, &fi); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_releasedir(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_release_in *arg) |
| { |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.flags = arg->flags; |
| fi.fh = arg->fh; |
| |
| if (req->f->op.releasedir) |
| req->f->op.releasedir(req, nodeid, &fi); |
| else |
| fuse_reply_err(req, 0); |
| } |
| |
| static void do_fsyncdir(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_fsync_in *inarg) |
| { |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = inarg->fh; |
| |
| if (req->f->op.fsyncdir) |
| req->f->op.fsyncdir(req, nodeid, inarg->fsync_flags & 1, &fi); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_statfs(fuse_req_t req) |
| { |
| if (req->f->op.statfs) |
| req->f->op.statfs(req); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_setxattr(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_setxattr_in *arg) |
| { |
| char *name = PARAM(arg); |
| char *value = name + strlen(name) + 1; |
| |
| if (req->f->op.setxattr) |
| req->f->op.setxattr(req, nodeid, name, value, arg->size, |
| arg->flags); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_getxattr(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_getxattr_in *arg) |
| { |
| if (req->f->op.getxattr) |
| req->f->op.getxattr(req, nodeid, PARAM(arg), arg->size); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_listxattr(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_getxattr_in *arg) |
| { |
| if (req->f->op.listxattr) |
| req->f->op.listxattr(req, nodeid, arg->size); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_removexattr(fuse_req_t req, fuse_ino_t nodeid, char *name) |
| { |
| if (req->f->op.removexattr) |
| req->f->op.removexattr(req, nodeid, name); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_getlk(fuse_req_t req, fuse_ino_t nodeid, |
| struct fuse_lk_in_out *arg) |
| { |
| if (req->f->op.getlk) { |
| struct fuse_lock_param lk; |
| |
| memset(&lk, 0, sizeof(lk)); |
| convert_file_lock(&arg->lk, &lk); |
| req->f->op.getlk(req, nodeid, &lk); |
| } else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_setlk(fuse_req_t req, fuse_ino_t nodeid, int issleep, |
| struct fuse_lk_in_out *arg) |
| { |
| if (req->f->op.setlk) { |
| struct fuse_lock_param lk; |
| |
| memset(&lk, 0, sizeof(lk)); |
| convert_file_lock(&arg->lk, &lk); |
| req->f->op.setlk(req, nodeid, issleep, &lk); |
| } else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_init(fuse_req_t req, struct fuse_init_in_out *arg) |
| { |
| struct fuse_init_in_out outarg; |
| struct fuse_ll *f = req->f; |
| |
| if (f->debug) { |
| printf("INIT: %u.%u\n", arg->major, arg->minor); |
| fflush(stdout); |
| } |
| f->got_init = 1; |
| if (f->op.init) |
| f->op.init(f->userdata); |
| |
| f->major = FUSE_KERNEL_VERSION; |
| f->minor = FUSE_KERNEL_MINOR_VERSION; |
| |
| memset(&outarg, 0, sizeof(outarg)); |
| outarg.major = f->major; |
| outarg.minor = f->minor; |
| |
| if (f->debug) { |
| printf(" INIT: %u.%u\n", outarg.major, outarg.minor); |
| fflush(stdout); |
| } |
| |
| send_reply_ok(req, &outarg, sizeof(outarg)); |
| } |
| |
| void *fuse_req_userdata(fuse_req_t req) |
| { |
| return req->f->userdata; |
| } |
| |
| const struct fuse_ctx *fuse_req_ctx(fuse_req_t req) |
| { |
| return &req->ctx; |
| } |
| |
| static void fuse_ll_process(void *data, const char *buf, size_t len, |
| struct fuse_chan *ch) |
| { |
| struct fuse_ll *f = (struct fuse_ll *) data; |
| struct fuse_in_header *in = (struct fuse_in_header *) buf; |
| const void *inarg = buf + sizeof(struct fuse_in_header); |
| struct fuse_req *req; |
| |
| if (f->debug) { |
| printf("unique: %llu, opcode: %s (%i), nodeid: %lu, insize: %i\n", |
| in->unique, opname((enum fuse_opcode) in->opcode), in->opcode, |
| (unsigned long) in->nodeid, len); |
| fflush(stdout); |
| } |
| |
| req = (struct fuse_req *) malloc(sizeof(struct fuse_req)); |
| if (req == NULL) { |
| fprintf(stderr, "fuse: failed to allocate request\n"); |
| return; |
| } |
| |
| req->f = f; |
| req->unique = in->unique; |
| req->ctx.uid = in->uid; |
| req->ctx.gid = in->gid; |
| req->ctx.pid = in->pid; |
| req->ch = ch; |
| |
| if (!f->got_init && in->opcode != FUSE_INIT) |
| fuse_reply_err(req, EPROTO); |
| else if (f->allow_root && in->uid != f->owner && in->uid != 0 && |
| in->opcode != FUSE_INIT && in->opcode != FUSE_READ && |
| in->opcode != FUSE_WRITE && in->opcode != FUSE_FSYNC && |
| in->opcode != FUSE_RELEASE && in->opcode != FUSE_READDIR && |
| in->opcode != FUSE_FSYNCDIR && in->opcode != FUSE_RELEASEDIR) { |
| fuse_reply_err(req, EACCES); |
| } else switch (in->opcode) { |
| case FUSE_INIT: |
| do_init(req, (struct fuse_init_in_out *) inarg); |
| break; |
| |
| case FUSE_LOOKUP: |
| do_lookup(req, in->nodeid, (char *) inarg); |
| break; |
| |
| case FUSE_FORGET: |
| do_forget(req, in->nodeid, (struct fuse_forget_in *) inarg); |
| break; |
| |
| case FUSE_GETATTR: |
| do_getattr(req, in->nodeid); |
| break; |
| |
| case FUSE_SETATTR: |
| do_setattr(req, in->nodeid, (struct fuse_setattr_in *) inarg); |
| break; |
| |
| case FUSE_READLINK: |
| do_readlink(req, in->nodeid); |
| break; |
| |
| case FUSE_MKNOD: |
| do_mknod(req, in->nodeid, (struct fuse_mknod_in *) inarg); |
| break; |
| |
| case FUSE_MKDIR: |
| do_mkdir(req, in->nodeid, (struct fuse_mkdir_in *) inarg); |
| break; |
| |
| case FUSE_UNLINK: |
| do_unlink(req, in->nodeid, (char *) inarg); |
| break; |
| |
| case FUSE_RMDIR: |
| do_rmdir(req, in->nodeid, (char *) inarg); |
| break; |
| |
| case FUSE_SYMLINK: |
| do_symlink(req, in->nodeid, (char *) inarg, |
| ((char *) inarg) + strlen((char *) inarg) + 1); |
| break; |
| |
| case FUSE_RENAME: |
| do_rename(req, in->nodeid, (struct fuse_rename_in *) inarg); |
| break; |
| |
| case FUSE_LINK: |
| do_link(req, in->nodeid, (struct fuse_link_in *) inarg); |
| break; |
| |
| case FUSE_OPEN: |
| do_open(req, in->nodeid, (struct fuse_open_in *) inarg); |
| break; |
| |
| case FUSE_FLUSH: |
| do_flush(req, in->nodeid, (struct fuse_flush_in *) inarg); |
| break; |
| |
| case FUSE_RELEASE: |
| do_release(req, in->nodeid, (struct fuse_release_in *) inarg); |
| break; |
| |
| case FUSE_READ: |
| do_read(req, in->nodeid, (struct fuse_read_in *) inarg); |
| break; |
| |
| case FUSE_WRITE: |
| do_write(req, in->nodeid, (struct fuse_write_in *) inarg); |
| break; |
| |
| case FUSE_STATFS: |
| do_statfs(req); |
| break; |
| |
| case FUSE_FSYNC: |
| do_fsync(req, in->nodeid, (struct fuse_fsync_in *) inarg); |
| break; |
| |
| case FUSE_SETXATTR: |
| do_setxattr(req, in->nodeid, (struct fuse_setxattr_in *) inarg); |
| break; |
| |
| case FUSE_GETXATTR: |
| do_getxattr(req, in->nodeid, (struct fuse_getxattr_in *) inarg); |
| break; |
| |
| case FUSE_LISTXATTR: |
| do_listxattr(req, in->nodeid, (struct fuse_getxattr_in *) inarg); |
| break; |
| |
| case FUSE_REMOVEXATTR: |
| do_removexattr(req, in->nodeid, (char *) inarg); |
| break; |
| |
| case FUSE_OPENDIR: |
| do_opendir(req, in->nodeid, (struct fuse_open_in *) inarg); |
| break; |
| |
| case FUSE_READDIR: |
| do_readdir(req, in->nodeid, (struct fuse_read_in *) inarg); |
| break; |
| |
| case FUSE_RELEASEDIR: |
| do_releasedir(req, in->nodeid, (struct fuse_release_in *) inarg); |
| break; |
| |
| case FUSE_FSYNCDIR: |
| do_fsyncdir(req, in->nodeid, (struct fuse_fsync_in *) inarg); |
| break; |
| |
| case FUSE_GETLK: |
| do_getlk(req, in->nodeid, (struct fuse_lk_in_out *) inarg); |
| break; |
| |
| case FUSE_SETLK: |
| do_setlk(req, in->nodeid, 0, (struct fuse_lk_in_out *) inarg); |
| break; |
| |
| case FUSE_SETLKW: |
| do_setlk(req, in->nodeid, 1, (struct fuse_lk_in_out *) inarg); |
| break; |
| |
| case FUSE_ACCESS: |
| do_access(req, in->nodeid, (struct fuse_access_in *) inarg); |
| break; |
| |
| default: |
| fuse_reply_err(req, ENOSYS); |
| } |
| } |
| |
| int fuse_lowlevel_is_lib_option(const char *opt) |
| { |
| if (strcmp(opt, "debug") == 0 || |
| strcmp(opt, "allow_root") == 0) |
| return 1; |
| else |
| return 0; |
| } |
| |
| static int parse_ll_opts(struct fuse_ll *f, const char *opts) |
| { |
| if (opts) { |
| char *xopts = strdup(opts); |
| char *s = xopts; |
| char *opt; |
| |
| if (xopts == NULL) { |
| fprintf(stderr, "fuse: memory allocation failed\n"); |
| return -1; |
| } |
| |
| while((opt = strsep(&s, ","))) { |
| if (strcmp(opt, "debug") == 0) |
| f->debug = 1; |
| else if (strcmp(opt, "allow_root") == 0) |
| f->allow_root = 1; |
| else |
| fprintf(stderr, "fuse: warning: unknown option `%s'\n", opt); |
| } |
| free(xopts); |
| } |
| return 0; |
| } |
| |
| static void fuse_ll_destroy(void *data) |
| { |
| struct fuse_ll *f = (struct fuse_ll *) data; |
| |
| if (f->op.destroy) |
| f->op.destroy(f->userdata); |
| |
| free(f); |
| } |
| |
| |
| struct fuse_session *fuse_lowlevel_new(const char *opts, |
| const struct fuse_lowlevel_ops *op, |
| size_t op_size, void *userdata) |
| { |
| struct fuse_ll *f; |
| struct fuse_session *se; |
| struct fuse_session_ops sop = { |
| .process = fuse_ll_process, |
| .destroy = fuse_ll_destroy, |
| }; |
| |
| if (sizeof(struct fuse_lowlevel_ops) < op_size) { |
| fprintf(stderr, "fuse: warning: library too old, some operations may not not work\n"); |
| op_size = sizeof(struct fuse_lowlevel_ops); |
| } |
| |
| f = (struct fuse_ll *) calloc(1, sizeof(struct fuse_ll)); |
| if (f == NULL) { |
| fprintf(stderr, "fuse: failed to allocate fuse object\n"); |
| goto out; |
| } |
| |
| if (parse_ll_opts(f, opts) == -1) |
| goto out_free; |
| |
| memcpy(&f->op, op, op_size); |
| f->owner = getuid(); |
| f->userdata = userdata; |
| |
| se = fuse_session_new(&sop, f); |
| if (!se) |
| goto out_free; |
| |
| return se; |
| |
| out_free: |
| free(f); |
| out: |
| return NULL; |
| } |
| |