mirror of https://github.com/tstack/lnav.git
369 lines
11 KiB
C++
369 lines
11 KiB
C++
/**
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* Copyright (c) 2017, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "fstat_vtab.hh"
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#include <glob.h>
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#include <grp.h>
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#include <pwd.h>
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#include <string.h>
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#include <sys/stat.h>
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#include "base/auto_mem.hh"
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#include "base/injector.hh"
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#include "base/lnav_log.hh"
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#include "bound_tags.hh"
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#include "config.h"
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#include "sql_util.hh"
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#include "vtab_module.hh"
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enum {
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FSTAT_COL_PARENT,
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FSTAT_COL_NAME,
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FSTAT_COL_DEV,
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FSTAT_COL_INO,
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FSTAT_COL_TYPE,
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FSTAT_COL_MODE,
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FSTAT_COL_NLINK,
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FSTAT_COL_UID,
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FSTAT_COL_USER,
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FSTAT_COL_GID,
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FSTAT_COL_GROUP,
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FSTAT_COL_RDEV,
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FSTAT_COL_SIZE,
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FSTAT_COL_BLKSIZE,
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FSTAT_COL_BLOCKS,
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FSTAT_COL_ATIME,
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FSTAT_COL_MTIME,
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FSTAT_COL_CTIME,
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FSTAT_COL_PATTERN,
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};
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/**
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* @feature f0:sql.tables.fstat
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*/
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struct fstat_table {
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static constexpr const char* NAME = "fstat";
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static constexpr const char* CREATE_STMT = R"(
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CREATE TABLE fstat (
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st_parent TEXT,
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st_name TEXT,
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st_dev INTEGER,
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st_ino INTEGER,
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st_type TEXT,
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st_mode INTEGER,
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st_nlink INTEGER,
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st_uid TEXT,
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st_user TEXT,
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st_gid TEXT,
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st_group TEXT,
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st_rdev INTEGER,
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st_size INTEGER,
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st_blksize INTEGER,
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st_blocks INTEGER,
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st_atime DATETIME,
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st_mtime DATETIME,
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st_ctime DATETIME,
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pattern TEXT HIDDEN
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);
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)";
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struct cursor {
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sqlite3_vtab_cursor base;
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std::string c_pattern;
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static_root_mem<glob_t, globfree> c_glob;
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size_t c_path_index{0};
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struct stat c_stat;
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cursor(sqlite3_vtab* vt) : base({vt})
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{
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memset(&this->c_stat, 0, sizeof(this->c_stat));
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}
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void load_stat()
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{
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while ((this->c_path_index < this->c_glob->gl_pathc)
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&& lstat(this->c_glob->gl_pathv[this->c_path_index],
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&this->c_stat)
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== -1)
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{
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this->c_path_index += 1;
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}
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}
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int next()
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{
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if (this->c_path_index < this->c_glob->gl_pathc) {
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this->c_path_index += 1;
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this->load_stat();
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}
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return SQLITE_OK;
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}
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int reset() { return SQLITE_OK; }
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int eof() { return this->c_path_index >= this->c_glob->gl_pathc; }
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int get_rowid(sqlite3_int64& rowid_out)
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{
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rowid_out = this->c_path_index;
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return SQLITE_OK;
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}
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};
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int get_column(const cursor& vc, sqlite3_context* ctx, int col)
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{
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const char* path = vc.c_glob->gl_pathv[vc.c_path_index];
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char time_buf[32];
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switch (col) {
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case FSTAT_COL_PARENT: {
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const char* slash = strrchr(path, '/');
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if (slash == nullptr) {
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sqlite3_result_text(ctx, ".", 1, SQLITE_STATIC);
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} else if (path[1] == '\0') {
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sqlite3_result_text(ctx, "", 0, SQLITE_STATIC);
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} else {
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sqlite3_result_text(
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ctx, path, slash - path + 1, SQLITE_TRANSIENT);
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}
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break;
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}
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case FSTAT_COL_NAME: {
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const char* slash = strrchr(path, '/');
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if (slash == nullptr) {
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sqlite3_result_text(ctx, path, -1, SQLITE_TRANSIENT);
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} else {
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sqlite3_result_text(ctx, slash + 1, -1, SQLITE_TRANSIENT);
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}
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break;
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}
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case FSTAT_COL_DEV:
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sqlite3_result_int(ctx, vc.c_stat.st_dev);
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break;
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case FSTAT_COL_INO:
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sqlite3_result_int64(ctx, vc.c_stat.st_ino);
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break;
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case FSTAT_COL_TYPE:
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if (S_ISREG(vc.c_stat.st_mode)) {
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sqlite3_result_text(ctx, "reg", 3, SQLITE_STATIC);
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} else if (S_ISBLK(vc.c_stat.st_mode)) {
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sqlite3_result_text(ctx, "blk", 3, SQLITE_STATIC);
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} else if (S_ISCHR(vc.c_stat.st_mode)) {
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sqlite3_result_text(ctx, "chr", 3, SQLITE_STATIC);
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} else if (S_ISDIR(vc.c_stat.st_mode)) {
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sqlite3_result_text(ctx, "dir", 3, SQLITE_STATIC);
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} else if (S_ISFIFO(vc.c_stat.st_mode)) {
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sqlite3_result_text(ctx, "fifo", 4, SQLITE_STATIC);
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} else if (S_ISLNK(vc.c_stat.st_mode)) {
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sqlite3_result_text(ctx, "lnk", 3, SQLITE_STATIC);
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} else if (S_ISSOCK(vc.c_stat.st_mode)) {
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sqlite3_result_text(ctx, "sock", 3, SQLITE_STATIC);
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}
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break;
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case FSTAT_COL_MODE:
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sqlite3_result_int(ctx, vc.c_stat.st_mode & 0777);
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break;
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case FSTAT_COL_NLINK:
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sqlite3_result_int(ctx, vc.c_stat.st_nlink);
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break;
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case FSTAT_COL_UID:
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sqlite3_result_int(ctx, vc.c_stat.st_uid);
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break;
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case FSTAT_COL_USER: {
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struct passwd* pw = getpwuid(vc.c_stat.st_uid);
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if (pw != nullptr) {
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sqlite3_result_text(ctx, pw->pw_name, -1, SQLITE_TRANSIENT);
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} else {
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sqlite3_result_int(ctx, vc.c_stat.st_uid);
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}
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break;
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}
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case FSTAT_COL_GID:
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sqlite3_result_int(ctx, vc.c_stat.st_gid);
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break;
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case FSTAT_COL_GROUP: {
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struct group* gr = getgrgid(vc.c_stat.st_gid);
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if (gr != nullptr) {
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sqlite3_result_text(ctx, gr->gr_name, -1, SQLITE_TRANSIENT);
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} else {
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sqlite3_result_int(ctx, vc.c_stat.st_gid);
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}
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break;
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}
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case FSTAT_COL_RDEV:
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sqlite3_result_int(ctx, vc.c_stat.st_rdev);
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break;
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case FSTAT_COL_SIZE:
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sqlite3_result_int64(ctx, vc.c_stat.st_size);
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break;
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case FSTAT_COL_BLKSIZE:
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sqlite3_result_int(ctx, vc.c_stat.st_blksize);
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break;
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case FSTAT_COL_BLOCKS:
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sqlite3_result_int(ctx, vc.c_stat.st_blocks);
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break;
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case FSTAT_COL_ATIME:
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sql_strftime(time_buf, sizeof(time_buf), vc.c_stat.st_atime, 0);
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sqlite3_result_text(ctx, time_buf, -1, SQLITE_TRANSIENT);
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break;
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case FSTAT_COL_MTIME:
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sql_strftime(time_buf, sizeof(time_buf), vc.c_stat.st_mtime, 0);
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sqlite3_result_text(ctx, time_buf, -1, SQLITE_TRANSIENT);
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break;
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case FSTAT_COL_CTIME:
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sql_strftime(time_buf, sizeof(time_buf), vc.c_stat.st_ctime, 0);
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sqlite3_result_text(ctx, time_buf, -1, SQLITE_TRANSIENT);
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break;
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case FSTAT_COL_PATTERN:
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sqlite3_result_text(ctx,
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vc.c_pattern.c_str(),
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vc.c_pattern.length(),
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SQLITE_TRANSIENT);
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break;
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}
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return SQLITE_OK;
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}
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#if 0
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int update_row(sqlite3_vtab *tab,
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sqlite3_int64 &index,
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const char *st_parent,
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const char *st_name,
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int64_t st_dev,
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int64_t st_ino,
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const char *st_type,
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int64_t st_mode,
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int64_t st_nlink,
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int64_t st_uid,
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const char *st_user,
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int64_t st_gid,
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const char *st_group,
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int64_t st_rdev,
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int64_t st_size,
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int64_t st_blksize,
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int64_t st_blocks,
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const char *atime,
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const char *mtime,
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const char *ctime,
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const char *pattern) {
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};
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#endif
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};
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static int
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rcBestIndex(sqlite3_vtab* tab, sqlite3_index_info* pIdxInfo)
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{
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vtab_index_constraints vic(pIdxInfo);
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vtab_index_usage viu(pIdxInfo);
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for (auto iter = vic.begin(); iter != vic.end(); ++iter) {
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if (iter->op != SQLITE_INDEX_CONSTRAINT_EQ) {
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continue;
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}
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switch (iter->iColumn) {
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case FSTAT_COL_PATTERN:
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viu.column_used(iter);
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break;
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}
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}
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viu.allocate_args(FSTAT_COL_PATTERN, FSTAT_COL_PATTERN, 1);
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return SQLITE_OK;
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}
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static int
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rcFilter(sqlite3_vtab_cursor* pVtabCursor,
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int idxNum,
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const char* idxStr,
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int argc,
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sqlite3_value** argv)
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{
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fstat_table::cursor* pCur = (fstat_table::cursor*) pVtabCursor;
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if (argc != 1) {
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pCur->c_pattern.clear();
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return SQLITE_OK;
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}
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const char* pattern = (const char*) sqlite3_value_text(argv[0]);
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pCur->c_pattern = pattern;
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switch (glob(pattern,
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#ifdef GLOB_TILDE
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GLOB_TILDE |
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#endif
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GLOB_ERR,
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nullptr,
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pCur->c_glob.inout()))
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{
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case GLOB_NOSPACE:
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pVtabCursor->pVtab->zErrMsg
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= sqlite3_mprintf("No space to perform glob()");
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return SQLITE_ERROR;
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case GLOB_NOMATCH:
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return SQLITE_OK;
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}
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pCur->load_stat();
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return SQLITE_OK;
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}
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int
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register_fstat_vtab(sqlite3* db)
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{
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static vtab_module<tvt_no_update<fstat_table>> FSTAT_MODULE;
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int rc;
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FSTAT_MODULE.vm_module.xBestIndex = rcBestIndex;
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FSTAT_MODULE.vm_module.xFilter = rcFilter;
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static auto& lnav_flags = injector::get<unsigned long&, lnav_flags_tag>();
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if (lnav_flags & LNF_SECURE_MODE) {
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return SQLITE_OK;
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}
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rc = FSTAT_MODULE.create(db, "fstat");
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ensure(rc == SQLITE_OK);
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return rc;
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}
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