/* Samba share mode database library external interface library. Used by non-Samba products needing access to the Samba share mode db. Copyright (C) Jeremy Allison 2005 - 2006 sharemodes_procid functions (C) Copyright (C) Volker Lendecke 2005 ** NOTE! The following LGPL license applies to this module only. ** This does NOT imply that all of Samba is released ** under the LGPL This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include "smb_share_modes.h" /* Database context handle. */ struct smbdb_ctx { TDB_CONTEXT *smb_tdb; }; /* Remove the paranoid malloc checker. */ #ifdef malloc #undef malloc #endif int smb_create_share_mode_entry_ex(struct smbdb_ctx *db_ctx, uint64_t dev, uint64_t ino, uint64_t extid, const struct smb_share_mode_entry *new_entry, const char *sharepath, const char *filename); static bool sharemodes_procid_equal(const struct server_id *p1, const struct server_id *p2) { return (p1->pid == p2->pid); } static pid_t sharemodes_procid_to_pid(const struct server_id *proc) { return proc->pid; } /* * open/close sharemode database. */ struct smbdb_ctx *smb_share_mode_db_open(const char *db_path) { struct smbdb_ctx *smb_db = (struct smbdb_ctx *)malloc(sizeof(struct smbdb_ctx)); if (!smb_db) { return NULL; } memset(smb_db, '\0', sizeof(struct smbdb_ctx)); smb_db->smb_tdb = tdb_open(db_path, 0, TDB_DEFAULT|TDB_CLEAR_IF_FIRST, O_RDWR|O_CREAT, 0644); if (!smb_db->smb_tdb) { free(smb_db); return NULL; } /* Should check that this is the correct version.... */ return smb_db; } /* key and data records in the tdb locking database */ struct locking_key { SMB_DEV_T dev; SMB_INO_T inode; uint64_t extid; }; int smb_share_mode_db_close(struct smbdb_ctx *db_ctx) { int ret = tdb_close(db_ctx->smb_tdb); free(db_ctx); return ret; } static TDB_DATA get_locking_key(struct locking_key *lk, uint64_t dev, uint64_t ino, uint64_t extid) { TDB_DATA ld; memset(lk, '\0', sizeof(*lk)); lk->dev = (SMB_DEV_T)dev; lk->inode = (SMB_INO_T)ino; lk->extid = extid; ld.dptr = (uint8 *)lk; ld.dsize = sizeof(*lk); return ld; } /* * lock/unlock entry in sharemode database. */ int smb_lock_share_mode_entry(struct smbdb_ctx *db_ctx, uint64_t dev, uint64_t ino, uint64_t extid) { struct locking_key lk; return tdb_chainlock(db_ctx->smb_tdb, get_locking_key(&lk, dev, ino, extid)); } int smb_unlock_share_mode_entry(struct smbdb_ctx *db_ctx, uint64_t dev, uint64_t ino, uint64_t extid) { struct locking_key lk; return tdb_chainunlock(db_ctx->smb_tdb, get_locking_key(&lk, dev, ino, extid)); } /* * Check if an external smb_share_mode_entry and an internal share_mode entry match. */ static int share_mode_entry_equal(const struct smb_share_mode_entry *e_entry, const struct share_mode_entry *entry) { return (sharemodes_procid_equal(&e_entry->pid, &entry->pid) && e_entry->file_id == (uint32_t)entry->share_file_id && e_entry->open_time.tv_sec == entry->time.tv_sec && e_entry->open_time.tv_usec == entry->time.tv_usec && e_entry->share_access == (uint32_t)entry->share_access && e_entry->access_mask == (uint32_t)entry->access_mask && e_entry->dev == entry->id.devid && e_entry->ino == entry->id.inode && e_entry->extid == entry->id.extid); } /* * Create an internal Samba share_mode entry from an external smb_share_mode_entry. */ static void create_share_mode_entry(struct share_mode_entry *out, const struct smb_share_mode_entry *in) { memset(out, '\0', sizeof(struct share_mode_entry)); out->pid = in->pid; out->share_file_id = (unsigned long)in->file_id; out->time.tv_sec = in->open_time.tv_sec; out->time.tv_usec = in->open_time.tv_usec; out->share_access = in->share_access; out->access_mask = in->access_mask; out->id.devid = in->dev; out->id.inode = in->ino; out->id.extid = in->extid; out->uid = (uint32)geteuid(); out->flags = 0; } /* * Return the current share mode list for an open file. * This uses similar (but simplified) logic to locking/locking.c */ int smb_get_share_mode_entries(struct smbdb_ctx *db_ctx, uint64_t dev, uint64_t ino, uint64_t extid, struct smb_share_mode_entry **pp_list, unsigned char *p_delete_on_close) { struct locking_key lk; TDB_DATA db_data; struct smb_share_mode_entry *list = NULL; int num_share_modes = 0; struct locking_data *ld = NULL; /* internal samba db state. */ struct share_mode_entry *shares = NULL; size_t i; int list_num; *pp_list = NULL; *p_delete_on_close = 0; db_data = tdb_fetch(db_ctx->smb_tdb, get_locking_key(&lk, dev, ino, extid)); if (!db_data.dptr) { return 0; } ld = (struct locking_data *)db_data.dptr; num_share_modes = ld->u.s.num_share_mode_entries; if (!num_share_modes) { free(db_data.dptr); return 0; } list = (struct smb_share_mode_entry *)malloc(sizeof(struct smb_share_mode_entry)*num_share_modes); if (!list) { free(db_data.dptr); return -1; } memset(list, '\0', num_share_modes * sizeof(struct smb_share_mode_entry)); shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct locking_data)); list_num = 0; for (i = 0; i < num_share_modes; i++) { struct share_mode_entry *share = &shares[i]; struct smb_share_mode_entry *sme = &list[list_num]; struct server_id pid = share->pid; /* Check this process really exists. */ if (kill(sharemodes_procid_to_pid(&pid), 0) == -1 && (errno == ESRCH)) { continue; /* No longer exists. */ } /* Ignore deferred open entries. */ if (share->op_type == DEFERRED_OPEN_ENTRY) { continue; } /* Copy into the external list. */ sme->dev = share->id.devid; sme->ino = share->id.inode; sme->extid = share->id.extid; sme->share_access = (uint32_t)share->share_access; sme->access_mask = (uint32_t)share->access_mask; sme->open_time.tv_sec = share->time.tv_sec; sme->open_time.tv_usec = share->time.tv_usec; sme->file_id = (uint32_t)share->share_file_id; sme->pid = share->pid; list_num++; } if (list_num == 0) { free(db_data.dptr); free(list); return 0; } *p_delete_on_close = ld->u.s.delete_on_close; *pp_list = list; free(db_data.dptr); return list_num; } /* * Create an entry in the Samba share mode db. */ int smb_create_share_mode_entry_ex(struct smbdb_ctx *db_ctx, uint64_t dev, uint64_t ino, uint64_t extid, const struct smb_share_mode_entry *new_entry, const char *sharepath, /* Must be absolute utf8 path. */ const char *filename) /* Must be relative utf8 path. */ { TDB_DATA db_data; struct locking_key lk; TDB_DATA locking_key = get_locking_key(&lk, dev, ino, extid); int orig_num_share_modes = 0; struct locking_data *ld = NULL; /* internal samba db state. */ struct share_mode_entry *shares = NULL; uint8 *new_data_p = NULL; size_t new_data_size = 0; db_data = tdb_fetch(db_ctx->smb_tdb, locking_key); if (!db_data.dptr) { /* We must create the entry. */ db_data.dptr = (uint8 *)malloc( sizeof(struct locking_data) + sizeof(struct share_mode_entry) + strlen(sharepath) + 1 + strlen(filename) + 1); if (!db_data.dptr) { return -1; } ld = (struct locking_data *)db_data.dptr; memset(ld, '\0', sizeof(struct locking_data)); ld->u.s.num_share_mode_entries = 1; ld->u.s.delete_on_close = 0; ld->u.s.delete_token_size = 0; shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct locking_data)); create_share_mode_entry(shares, new_entry); memcpy(db_data.dptr + sizeof(struct locking_data) + sizeof(struct share_mode_entry), sharepath, strlen(sharepath) + 1); memcpy(db_data.dptr + sizeof(struct locking_data) + sizeof(struct share_mode_entry) + strlen(sharepath) + 1, filename, strlen(filename) + 1); db_data.dsize = sizeof(struct locking_data) + sizeof(struct share_mode_entry) + strlen(sharepath) + 1 + strlen(filename) + 1; if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_INSERT) == -1) { free(db_data.dptr); return -1; } free(db_data.dptr); return 0; } /* Entry exists, we must add a new entry. */ new_data_p = (uint8 *)malloc( db_data.dsize + sizeof(struct share_mode_entry)); if (!new_data_p) { free(db_data.dptr); return -1; } ld = (struct locking_data *)db_data.dptr; orig_num_share_modes = ld->u.s.num_share_mode_entries; /* Copy the original data. */ memcpy(new_data_p, db_data.dptr, sizeof(struct locking_data) + (orig_num_share_modes * sizeof(struct share_mode_entry))); /* Add in the new share mode */ shares = (struct share_mode_entry *)(new_data_p + sizeof(struct locking_data) + (orig_num_share_modes * sizeof(struct share_mode_entry))); create_share_mode_entry(shares, new_entry); ld = (struct locking_data *)new_data_p; ld->u.s.num_share_mode_entries++; /* Append the original delete_token and filenames. */ memcpy(new_data_p + sizeof(struct locking_data) + (ld->u.s.num_share_mode_entries * sizeof(struct share_mode_entry)), db_data.dptr + sizeof(struct locking_data) + (orig_num_share_modes * sizeof(struct share_mode_entry)), db_data.dsize - sizeof(struct locking_data) - (orig_num_share_modes * sizeof(struct share_mode_entry))); new_data_size = db_data.dsize + sizeof(struct share_mode_entry); free(db_data.dptr); db_data.dptr = new_data_p; db_data.dsize = new_data_size; if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_REPLACE) == -1) { free(db_data.dptr); return -1; } free(db_data.dptr); return 0; } /* * Create an entry in the Samba share mode db. Original interface - doesn't * Distinguish between share path and filename. Fudge this by using a * sharepath of / and a relative filename of (filename+1). */ int smb_create_share_mode_entry(struct smbdb_ctx *db_ctx, uint64_t dev, uint64_t ino, uint64_t extid, const struct smb_share_mode_entry *new_entry, const char *filename) /* Must be absolute utf8 path. */ { if (*filename != '/') { abort(); } return smb_create_share_mode_entry_ex(db_ctx, dev, ino, extid, new_entry, "/", &filename[1]); } int smb_delete_share_mode_entry(struct smbdb_ctx *db_ctx, uint64_t dev, uint64_t ino, uint64_t extid, const struct smb_share_mode_entry *del_entry) { TDB_DATA db_data; struct locking_key lk; TDB_DATA locking_key = get_locking_key(&lk, dev, ino, extid); int orig_num_share_modes = 0; struct locking_data *ld = NULL; /* internal samba db state. */ struct share_mode_entry *shares = NULL; uint8 *new_data_p = NULL; size_t remaining_size = 0; size_t i, num_share_modes; const uint8 *remaining_ptr = NULL; db_data = tdb_fetch(db_ctx->smb_tdb, locking_key); if (!db_data.dptr) { return -1; /* Error - missing entry ! */ } ld = (struct locking_data *)db_data.dptr; orig_num_share_modes = ld->u.s.num_share_mode_entries; shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct locking_data)); if (orig_num_share_modes == 1) { /* Only one entry - better be ours... */ if (!share_mode_entry_equal(del_entry, shares)) { /* Error ! We can't delete someone else's entry ! */ free(db_data.dptr); return -1; } /* It's ours - just remove the entire record. */ free(db_data.dptr); return tdb_delete(db_ctx->smb_tdb, locking_key); } /* More than one - allocate a new record minus the one we'll delete. */ new_data_p = (uint8 *)malloc( db_data.dsize - sizeof(struct share_mode_entry)); if (!new_data_p) { free(db_data.dptr); return -1; } /* Copy the header. */ memcpy(new_data_p, db_data.dptr, sizeof(struct locking_data)); num_share_modes = 0; for (i = 0; i < orig_num_share_modes; i++) { struct share_mode_entry *share = &shares[i]; struct server_id pid = share->pid; /* Check this process really exists. */ if (kill(sharemodes_procid_to_pid(&pid), 0) == -1 && (errno == ESRCH)) { continue; /* No longer exists. */ } if (share_mode_entry_equal(del_entry, share)) { continue; /* This is our delete taget. */ } memcpy(new_data_p + sizeof(struct locking_data) + (num_share_modes * sizeof(struct share_mode_entry)), share, sizeof(struct share_mode_entry) ); num_share_modes++; } if (num_share_modes == 0) { /* None left after pruning. Delete record. */ free(db_data.dptr); free(new_data_p); return tdb_delete(db_ctx->smb_tdb, locking_key); } /* Copy any delete token plus the terminating filenames. */ remaining_ptr = db_data.dptr + sizeof(struct locking_data) + (orig_num_share_modes * sizeof(struct share_mode_entry)); remaining_size = db_data.dsize - (remaining_ptr - db_data.dptr); memcpy(new_data_p + sizeof(struct locking_data) + (num_share_modes * sizeof(struct share_mode_entry)), remaining_ptr, remaining_size); free(db_data.dptr); db_data.dptr = new_data_p; /* Re-save smaller record. */ ld = (struct locking_data *)db_data.dptr; ld->u.s.num_share_mode_entries = num_share_modes; db_data.dsize = sizeof(struct locking_data) + (num_share_modes * sizeof(struct share_mode_entry)) + remaining_size; if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_REPLACE) == -1) { free(db_data.dptr); return -1; } free(db_data.dptr); return 0; } int smb_change_share_mode_entry(struct smbdb_ctx *db_ctx, uint64_t dev, uint64_t ino, uint64_t extid, const struct smb_share_mode_entry *set_entry, const struct smb_share_mode_entry *new_entry) { TDB_DATA db_data; struct locking_key lk; TDB_DATA locking_key = get_locking_key(&lk, dev, ino, extid); int num_share_modes = 0; struct locking_data *ld = NULL; /* internal samba db state. */ struct share_mode_entry *shares = NULL; size_t i; int found_entry = 0; db_data = tdb_fetch(db_ctx->smb_tdb, locking_key); if (!db_data.dptr) { return -1; /* Error - missing entry ! */ } ld = (struct locking_data *)db_data.dptr; num_share_modes = ld->u.s.num_share_mode_entries; shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct locking_data)); for (i = 0; i < num_share_modes; i++) { struct share_mode_entry *share = &shares[i]; struct server_id pid = share->pid; /* Check this process really exists. */ if (kill(sharemodes_procid_to_pid(&pid), 0) == -1 && (errno == ESRCH)) { continue; /* No longer exists. */ } if (share_mode_entry_equal(set_entry, share)) { create_share_mode_entry(share, new_entry); found_entry = 1; break; } } if (!found_entry) { free(db_data.dptr); return -1; } /* Save modified data. */ if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_REPLACE) == -1) { free(db_data.dptr); return -1; } free(db_data.dptr); return 0; }