commit 71f10389a141e5d1a1da751c4ad7187c92fbbee8 Author: Luca Bruno Date: Sun Mar 14 20:18:51 2010 +0100 First commit diff --git a/AUTHORS b/AUTHORS new file mode 100644 index 0000000..eafc602 --- /dev/null +++ b/AUTHORS @@ -0,0 +1 @@ +Luca Bruno \ No newline at end of file diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..7e05a71 --- /dev/null +++ b/Makefile @@ -0,0 +1,19 @@ +CC = gcc +CFLAGS = -g -Wall -fPIC +LIBS = -lc -ldl -lsqlite3 +LDFLAGS = -nostdlib -shared +COMPILE = $(CC) $(CFLAGS) +LINK = $(CC) $(LDFLAGS) $(LIBS) +SRCS = tdpkg.c cache.c +OBJS = $(subst .c,.o,$(SRCS)) + +all: libtdpkg.so + +libtdpkg.so: $(OBJS) + $(LINK) -o libtdpkg.so $+ + +%.o: %.c + $(COMPILE) -c $< + +clean: + rm -f libtdpkg.so *.o \ No newline at end of file diff --git a/README b/README new file mode 100644 index 0000000..328fa7e --- /dev/null +++ b/README @@ -0,0 +1,25 @@ +The `tdpkg' shared library is used to speed up dpkg .list file handling using sqlite3. +Homepage: http://lethalman.hostei.com/tdpkg.html + +REQUIREMENTS + +build-essential +libsqlite3-dev + +BUILD + +Type `make'. +You'd better not install this library, it could make your system highly unstable. + +USAGE + +Please make a backup copy of your /var/lib/dpkg/info directory before using tdpkg. + +LD_PRELOAD="./libtdpkg.so" dpkg ... + +BENCHMARKING + +The operations involved with dpkg database reading are mostly done on the file system. +For this reason cleaning up the kernel cache is a must before calling either tdpkg or dpkg: + +echo 1 > /proc/sys/vm/drop_caches diff --git a/cache.c b/cache.c new file mode 100644 index 0000000..c7c4eb1 --- /dev/null +++ b/cache.c @@ -0,0 +1,177 @@ +/* + Copyright © 2010 Luca Bruno + + This file is part of tdpkg. + + tdpkg is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + tdpkg is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with tdpkg. If not, see . +*/ + +#include +#include +#include +#include +#include +#include + +#include "cache.h" + +#define sqlite_error(ret) { fprintf (stderr, "tdpkg sqlite: %s\n", sqlite3_errmsg (db)); return ret; } +#define READ_FILE_SQL "SELECT contents FROM files WHERE filename=?" +#define INSERT_FILE_SQL "INSERT INTO files (filename, contents) VALUES (?, ?)" + +static sqlite3* db; +static sqlite3_stmt* read_file_stmt; +static sqlite3_stmt* insert_file_stmt; + +static int +_sqlite_exec (const char* sql) +{ + char* errmsg = NULL; + sqlite3_exec (db, sql, NULL, NULL, &errmsg); + if (errmsg) + { + fprintf (stderr, "tdpkg sqlite: %s\n", errmsg); + sqlite3_free (errmsg); + return -1; + } + return 0; +} + +/* returns 0 on success */ +int +tdpkg_cache_init (const char* filename) +{ + if (sqlite3_initialize () != SQLITE_OK) + sqlite_error (-1); + + if (sqlite3_open (filename, &db) != SQLITE_OK) + sqlite_error (-1); + + if (_sqlite_exec ("CREATE TABLE IF NOT EXISTS files (filename varchar(255) primary key, contents text);")) + return -1; + + if (sqlite3_prepare (db, READ_FILE_SQL, -1, &read_file_stmt, NULL) != SQLITE_OK) + sqlite_error (-1); + + if (sqlite3_prepare (db, INSERT_FILE_SQL, -1, &insert_file_stmt, NULL) != SQLITE_OK) + sqlite_error (-1); + + return 0; +} + +char* +tdpkg_cache_read_filename (const char* filename) +{ + if (sqlite3_reset (read_file_stmt) != SQLITE_OK) + sqlite_error (NULL); + + if (sqlite3_bind_text (read_file_stmt, 1, filename, -1, SQLITE_STATIC) != SQLITE_OK) + sqlite_error (NULL); + + if (sqlite3_step (read_file_stmt) != SQLITE_ROW) + return NULL; + + char* result = strdup ((const char*)sqlite3_column_text (read_file_stmt, 0)); + + if (sqlite3_step (read_file_stmt) != SQLITE_DONE) + { + free (result); + sqlite_error (NULL); + } + + return result; +} + +int +tdpkg_cache_rebuild (void) +{ + glob_t glob_list; + if (glob ("/var/lib/dpkg/info/*.list", 0, NULL, &glob_list)) + { + fprintf (stderr, "tdpkg sqlite: can't glob /var/lib/dpkg/info/*.list\n"); + return -1; + } + + if (_sqlite_exec ("DELETE FROM files; BEGIN;")) + return -1; + + int i; + for (i=0; i < glob_list.gl_pathc; i++) + { + const char* filename = glob_list.gl_pathv[i]; + struct stat stat_buf; + + /* we don't use fstat because it's been wrapped */ + if (__xstat (1, filename, &stat_buf)) + { + fprintf (stderr, "tdpkg sqlite: can't stat %s\n", filename); + return -1; + } + size_t size = stat_buf.st_size; + + FILE* file = fopen (filename, "r"); + if (!file) + { + fprintf (stderr, "tdpkg sqlite: can't open %s\n", filename); + return -1; + } + + printf ("tdpkg: (Indexing list file %d...)\r", i+1); + + char* contents = malloc (size); + if (fread (contents, sizeof (char), size, file) < size) + { + // FIXME: let's handle this? + _sqlite_exec ("ROLLBACK;"); + fclose (file); + fprintf (stderr, "tdpkg sqlite: can't read full file %s of size %ld\n", filename, size); + } + fclose (file); + + if (sqlite3_reset (insert_file_stmt) != SQLITE_OK) + { + _sqlite_exec ("ROLLBACK;"); + sqlite_error (-1); + } + + if (sqlite3_bind_text (insert_file_stmt, 1, filename, -1, SQLITE_STATIC) != SQLITE_OK) + { + _sqlite_exec ("ROLLBACK;"); + sqlite_error (-1); + } + + if (sqlite3_bind_text (insert_file_stmt, 2, contents, size, SQLITE_STATIC) != SQLITE_OK) + { + _sqlite_exec ("ROLLBACK;"); + free (contents); + sqlite_error (-1); + } + + if (sqlite3_step (insert_file_stmt) != SQLITE_DONE) + { + _sqlite_exec ("ROLLBACK;"); + free (contents); + sqlite_error (-1); + } + + free (contents); + } + + if (_sqlite_exec ("COMMIT;")) + return -1; + + printf ("tdpkg: %d list files inserted succefully\n", i); + + return 0; +} diff --git a/cache.h b/cache.h new file mode 100644 index 0000000..12d6a76 --- /dev/null +++ b/cache.h @@ -0,0 +1,8 @@ +#ifndef CACHE_H +#define CACHE_H + +int tdpkg_cache_init (const char* filename); +char* tdpkg_cache_read_filename (const char* filename); +int tdpkg_cache_rebuild (void); + +#endif diff --git a/tdpkg.c b/tdpkg.c new file mode 100644 index 0000000..c4f986c --- /dev/null +++ b/tdpkg.c @@ -0,0 +1,282 @@ +/* + Copyright © 2010 Luca Bruno + + This file is part of tdpkg. + + tdpkg is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + tdpkg is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with tdpkg. If not, see . +*/ + +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include + +#include "cache.h" + +/* real functions */ +static int (*realopen)(const char *path, int oflag, ...); +static int (*real__fxstat)(int ver, int fd, struct stat* buf); +static int (*real__fxstat64)(int ver, int fd, struct stat64* buf); +static ssize_t (*realread)(int fildes, void *buf, size_t nbyte); +static int (*realclose)(int fd); +static FILE* (*realfopen)(const char *path, const char *mode); +static FILE* (*realfdopen)(int fd, const char *mode); +static int (*realfclose)(FILE* fp); + +/* state */ +static struct FopenState +{ + FILE* file; + int putc_called; +} fopen_state; + +#define FAKE_FD 1234 +static struct OpenState +{ + int fd; + char* contents; + size_t len; + size_t read; +} open_state; + +static FILE* ignore_file; +static int cache_initialized; + +/* called once library is preloaded */ +void _init (void) +{ + static int initialized = 0; + if (!initialized) + initialized = 1; + else + return; + + memset (&fopen_state, '\0', sizeof (fopen_state)); + memset (&open_state, '\0', sizeof (open_state)); + open_state.fd = -1; + + realopen = dlsym (RTLD_NEXT, "open"); + real__fxstat = dlsym (RTLD_NEXT, "__fxstat"); + real__fxstat64 = dlsym (RTLD_NEXT, "__fxstat64"); + realread = dlsym (RTLD_NEXT, "read"); + realclose = dlsym (RTLD_NEXT, "close"); + realfopen = dlsym (RTLD_NEXT, "fopen"); + realfdopen = dlsym (RTLD_NEXT, "fdopen"); + realfclose = dlsym (RTLD_NEXT, "fclose"); + + const char* cache_filename = "cache.db"; + if (!tdpkg_cache_init (cache_filename)) + cache_initialized = 1; + else + fprintf (stderr, "tdpkg: cache at %s initialization failed, no wrapping\n", cache_filename); +} + +static int +is_list_file (const char* path) +{ + return strstr (path, "/var/lib/dpkg/info/") && strstr (path, ".list"); +} + +FILE* +fopen (const char *path, const char *mode) +{ + if (!cache_initialized) + return realfopen (path, mode); + + if (!is_list_file (path)) + return realfopen (path, mode); + + if (fopen_state.file) + { + fprintf (stderr, "tdpkg: multiple fopen(%s, %s) without fclose() detected, no wrapping\n", path, mode); + return realfopen (path, mode); + } + + printf ("tpkdg: fopen(%s, %s)\n", path, mode); + fopen_state.file = realfopen (path, mode); + return fopen_state.file; +} + +FILE* +fdopen (int fd, const char *mode) +{ + if (!cache_initialized) + return realfdopen (fd, mode); + + ignore_file = realfdopen (fd, mode); + return ignore_file; +} + +int +fclose (FILE *fp) +{ + if (!cache_initialized) + return realfclose (fp); + + if (fp == ignore_file) + { + printf ("tdpkg: ignored %p\n", ignore_file); + ignore_file = NULL; + return realfclose (fp); + } + + if (fopen_state.file != fp) + { + fprintf (stderr, "tdpkg: fclose() to unknown file %p detected, no wrapping\n", fp); + return realfclose (fp); + } + + printf ("tdpkg: fclose()\n"); + int result = realfclose (fopen_state.file); + fopen_state.file = NULL; + + return result; +} + +int +open (const char *path, int oflag, int mode) +{ + if (!cache_initialized) + return realopen (path, oflag, mode); + + if (!is_list_file (path)) + return realopen (path, oflag, mode); + + if (open_state.fd >= 0) + { + fprintf (stderr, "tdpkg: multiple open(%s, %d, %d) without close() detected, no wrapping\n", path, oflag, mode); + return realopen (path, oflag, mode); + } + + open_state.contents = tdpkg_cache_read_filename (path); + if (!open_state.contents) + { + fprintf (stderr, "tdpkg: file %s not up-to-date in cache, rebuild cache\n", path); + cache_initialized = 0; + if (tdpkg_cache_rebuild ()) + { + fprintf (stderr, "tdpkg: can't rebuild cache, no wrapping\n"); + return realopen (path, oflag, mode); + } + cache_initialized = 1; + + open_state.contents = tdpkg_cache_read_filename (path); + if (!open_state.contents) + { + fprintf (stderr, "tdpkg: path %s not being indexed, no wrapping\n", path); + return realopen (path, oflag, mode); + } + } + + printf ("tdpkg: open(%s, %d, %d)\n", path, oflag, mode); + open_state.fd = FAKE_FD; + open_state.len = strlen (open_state.contents); + + return open_state.fd; +} + +int +__fxstat (int ver, int fd, struct stat* buf) +{ + if (!cache_initialized) + return real__fxstat (ver, fd, buf); + + if (open_state.fd < 0) + return real__fxstat (ver, fd, buf); + + if (open_state.fd != fd) + { + fprintf (stderr, "tdpkg: __fxstat() to unknown fd %d\n", fd); + return real__fxstat (ver, fd, buf); + } + + printf ("tdpkg: __fxstat(%d) is %ld\n", fd, open_state.len); + buf->st_size = open_state.len; + return 0; +} + +int +__fxstat64 (int ver, int fd, struct stat64* buf) +{ + if (!cache_initialized) + return real__fxstat64 (ver, fd, buf); + + if (open_state.fd < 0) + return real__fxstat64 (ver, fd, buf); + + if (open_state.fd != fd) + { + fprintf (stderr, "tdpkg: __fxstat64() to unknown fd %d\n", fd); + return real__fxstat64 (ver, fd, buf); + } + + printf ("tdpkg: __fxstat64(%d) is %ld\n", fd, open_state.len); + buf->st_size = open_state.len; + return 0; +} + +ssize_t +read (int fildes, void *buf, size_t nbyte) +{ + if (!cache_initialized) + return realread (fildes, buf, nbyte); + + if (open_state.fd < 0) + return realread (fildes, buf, nbyte); + + if (open_state.fd != fildes) + { + fprintf (stderr, "tdpkg: read() to unknown fd %d detected, no wrapping\n", fildes); + return realread (fildes, buf, nbyte); + } + + if (open_state.read > open_state.len) + { + fprintf (stderr, "tdpkg: read() already done on %d, returning 0\n", open_state.fd); + return 0; + } + + size_t nowread = (open_state.len-open_state.read) > nbyte ? nbyte : (open_state.len-open_state.read); + memcpy (buf, open_state.contents+open_state.read, nowread); + open_state.read += nowread; + printf ("tdpkg: read(%d, %p, %ld) -> %ld\n", fildes, buf, nbyte, nowread); + return nowread; +} + +int +close (int fd) +{ + if (!cache_initialized) + return realclose (fd); + + if (open_state.fd < 0) + return realclose (fd); + + if (open_state.fd != fd) + { + fprintf (stderr, "tdpkg: close() on unknown fd %d, no wrapping\n", fd); + return realclose (fd); + } + + open_state.fd = -1; + if (open_state.contents) + free (open_state.contents); + open_state.contents = NULL; + open_state.len = 0; + open_state.read = 0; + return 0; +}