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pkg_delete.c
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pkg_delete.c
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/*-
* Copyright (c) 2011-2014 Baptiste Daroussin <bapt@FreeBSD.org>
* Copyright (c) 2011-2012 Julien Laffaye <jlaffaye@FreeBSD.org>
* Copyright (c) 2011 Will Andrews <will@FreeBSD.org>
* Copyright (c) 2011 Philippe Pepiot <phil@philpep.org>
* Copyright (c) 2014 Vsevolod Stakhov <vsevolod@FreeBSD.org>
* Copyright (c) 2023 Serenity Cyber Security, LLC
* Author: Gleb Popov <arrowd@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "pkg_config.h"
#endif
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <bsd_compat.h>
#include "pkg.h"
#include "private/event.h"
#include "private/pkg.h"
#include "private/pkgdb.h"
#include "private/utils.h"
#if defined(UF_NOUNLINK)
#define NOCHANGESFLAGS (UF_IMMUTABLE | UF_APPEND | UF_NOUNLINK | SF_IMMUTABLE | SF_APPEND | SF_NOUNLINK)
#else
#define NOCHANGESFLAGS (UF_IMMUTABLE | UF_APPEND | SF_IMMUTABLE | SF_APPEND)
#endif
int
pkg_delete(struct pkg *pkg, struct pkg *rpkg, struct pkgdb *db, int flags,
struct triggers *t)
{
xstring *message = NULL;
int ret, cancel = 0;
bool handle_rc = false;
const unsigned load_flags = PKG_LOAD_RDEPS|PKG_LOAD_FILES|PKG_LOAD_DIRS|
PKG_LOAD_SCRIPTS|PKG_LOAD_ANNOTATIONS|PKG_LOAD_LUA_SCRIPTS;
assert(pkg != NULL);
assert(db != NULL);
if (pkgdb_ensure_loaded(db, pkg, load_flags) != EPKG_OK)
return (EPKG_FATAL);
if (rpkg != NULL && pkgdb_ensure_loaded(db, rpkg, load_flags) != EPKG_OK)
return (EPKG_FATAL);
pkg_emit_new_action();
pkg_emit_deinstall_begin(pkg);
/* If the package is locked */
if (pkg->locked) {
pkg_emit_locked(pkg);
return (EPKG_LOCKED);
}
/*
* stop the different related services if the users do want that
* and that the service is running
*/
handle_rc = pkg_object_bool(pkg_config_get("HANDLE_RC_SCRIPTS"));
if (handle_rc)
pkg_start_stop_rc_scripts(pkg, PKG_RC_STOP);
if ((flags & (PKG_DELETE_NOSCRIPT | PKG_DELETE_UPGRADE)) == 0) {
pkg_open_root_fd(pkg);
ret = pkg_lua_script_run(pkg, PKG_LUA_PRE_DEINSTALL, false);
if (ret != EPKG_OK && ctx.developer_mode)
return (ret);
ret = pkg_script_run(pkg, PKG_SCRIPT_PRE_DEINSTALL, false);
if (ret != EPKG_OK && ctx.developer_mode)
return (ret);
}
ret = pkg_delete_files(pkg, rpkg, flags, t);
if (ret == EPKG_CANCEL)
cancel = 1;
else if (ret != EPKG_OK)
return (ret);
if ((flags & (PKG_DELETE_NOSCRIPT | PKG_DELETE_UPGRADE)) == 0) {
pkg_lua_script_run(pkg, PKG_LUA_POST_DEINSTALL, false);
pkg_script_run(pkg, PKG_SCRIPT_POST_DEINSTALL, false);
}
ret = pkg_delete_dirs(db, pkg, NULL);
if (ret != EPKG_OK)
return (ret);
if ((flags & PKG_DELETE_UPGRADE) == 0) {
pkg_emit_deinstall_finished(pkg);
tll_foreach(pkg->message, m) {
if (m->item->type == PKG_MESSAGE_REMOVE) {
if (message == NULL) {
message = xstring_new();
pkg_fprintf(message->fp, "Message from "
"%n-%v:\n", pkg, pkg);
}
fprintf(message->fp, "%s\n", m->item->str);
}
}
if (pkg_has_message(pkg) && message != NULL) {
fflush(message->fp);
pkg_emit_message(message->buf);
xstring_free(message);
}
}
ret = pkgdb_unregister_pkg(db, pkg->id);
if (ret != EPKG_OK)
return ret;
return (cancel ? EPKG_CANCEL : ret);
}
void
pkg_add_dir_to_del(struct pkg *pkg, const char *file, const char *dir)
{
char path[MAXPATHLEN];
char *tmp;
size_t len, len2;
strlcpy(path, file != NULL ? file : dir, MAXPATHLEN);
if (file != NULL) {
tmp = strrchr(path, '/');
tmp[1] = '\0';
}
len = strlen(path);
/* make sure to finish by a / */
if (len > 0 && path[len - 1] != '/' && len < MAXPATHLEN) {
path[len] = '/';
len++;
path[len] = '\0';
}
tll_foreach(pkg->dir_to_del, d) {
len2 = strlen(d->item);
if (len2 >= len && strncmp(path, d->item, len) == 0)
return;
if (strncmp(path, d->item, len2) == 0) {
pkg_debug(1, "Replacing in deletion %s with %s",
d->item, path);
tll_remove_and_free(pkg->dir_to_del, d, free);
break;
}
}
pkg_debug(1, "Adding to deletion %s", path);
tll_push_back(pkg->dir_to_del, xstrdup(path));
}
static void
rmdir_p(struct pkgdb *db, struct pkg *pkg, char *dir, const char *prefix_r)
{
char *tmp;
int64_t cnt;
char fullpath[MAXPATHLEN];
size_t len;
#ifdef HAVE_STRUCT_STAT_ST_FLAGS
struct stat st;
#if !defined(HAVE_CHFLAGSAT)
int fd;
#endif
#endif
len = snprintf(fullpath, sizeof(fullpath), "/%s", dir);
while (fullpath[len -1] == '/') {
fullpath[len - 1] = '\0';
len--;
}
if (pkgdb_is_dir_used(db, pkg, fullpath, &cnt) != EPKG_OK)
return;
pkg_debug(1, "Number of packages owning the directory '%s': %d",
fullpath, (int)cnt);
/*
* At this moment the package we are removing have already been removed
* from the local database so if anything else is owning the directory
* that is another package meaning only remove the diretory is cnt == 0
*/
if (cnt > 0)
return;
if (STREQ(prefix_r, fullpath + 1))
return;
pkg_debug(1, "removing directory %s", fullpath);
#ifdef HAVE_STRUCT_STAT_ST_FLAGS
if (fstatat(pkg->rootfd, dir, &st, AT_SYMLINK_NOFOLLOW) != -1) {
if (st.st_flags & NOCHANGESFLAGS) {
#ifdef HAVE_CHFLAGSAT
/* Disable all flags*/
chflagsat(pkg->rootfd, dir, 0, AT_SYMLINK_NOFOLLOW);
#else
fd = openat(pkg->rootfd, dir, O_NOFOLLOW);
if (fd > 0) {
fchflags(fd, 0);
close(fd);
}
#endif
}
}
#endif
if (unlinkat(pkg->rootfd, dir, AT_REMOVEDIR) == -1) {
if (errno != ENOTEMPTY && errno != EBUSY)
pkg_emit_errno("unlinkat", dir);
/* If the directory was already removed by a bogus script, continue removing parents */
if (errno != ENOENT)
return;
}
/* No recursivity for packages out of the prefix */
if (strncmp(prefix_r, dir, strlen(prefix_r)) != 0)
return;
/* remove the trailing '/' */
tmp = strrchr(dir, '/');
if (tmp == NULL)
return;
if (tmp == dir)
return;
tmp[0] = '\0';
tmp = strrchr(dir, '/');
if (tmp == NULL)
return;
tmp[1] = '\0';
rmdir_p(db, pkg, dir, prefix_r);
}
static void
pkg_effective_rmdir(struct pkgdb *db, struct pkg *pkg)
{
char prefix_r[MAXPATHLEN];
snprintf(prefix_r, sizeof(prefix_r), "%s", pkg->prefix[0] ? pkg->prefix + 1 : "");
tll_foreach(pkg->dir_to_del, d)
rmdir_p(db, pkg, d->item, prefix_r);
}
void
pkg_delete_file(struct pkg *pkg, struct pkg_file *file)
{
const char *path;
const char *prefix_rel;
size_t len;
#ifdef HAVE_STRUCT_STAT_ST_FLAGS
struct stat st;
#if !defined(HAVE_CHFLAGSAT)
int fd;
#endif
#endif
pkg_open_root_fd(pkg);
path = file->path;
path++;
prefix_rel = pkg->prefix;
prefix_rel++;
len = strlen(prefix_rel);
while (len > 0 && prefix_rel[len - 1] == '/')
len--;
#ifdef HAVE_STRUCT_STAT_ST_FLAGS
if (fstatat(pkg->rootfd, path, &st, AT_SYMLINK_NOFOLLOW) != -1) {
if (st.st_flags & NOCHANGESFLAGS) {
#ifdef HAVE_CHFLAGSAT
chflagsat(pkg->rootfd, path,
st.st_flags & ~NOCHANGESFLAGS,
AT_SYMLINK_NOFOLLOW);
#else
fd = openat(pkg->rootfd, path, O_NOFOLLOW);
if (fd > 0) {
fchflags(fd, st.st_flags & ~NOCHANGESFLAGS);
close(fd);
}
#endif
}
}
#endif
pkg_debug(1, "Deleting file: '%s'", path);
if (unlinkat(pkg->rootfd, path, 0) == -1) {
if (errno == ENOENT)
pkg_emit_file_missing(pkg, file);
else
pkg_emit_errno("unlinkat", path);
return;
}
/* do not bother about directories not in prefix */
if ((strncmp(prefix_rel, path, len) == 0) && path[len] == '/')
pkg_add_dir_to_del(pkg, path, NULL);
}
/*
* Handle a special case: the package is to be upgraded but is being deleted
* temporarily to handle a file path conflict. In this situation we shouldn't
* remove configuration files. For now, keep them if the replacement package
* contains a configuration file at the same path.
*
* Note, this currently doesn't handle the case where a configuration file
* participates in the conflict, i.e., it moves from one package to another.
*/
static bool
pkg_delete_skip_config(struct pkg *pkg, struct pkg *rpkg, struct pkg_file *file,
int flags)
{
if ((flags & PKG_DELETE_UPGRADE) == 0)
return (false);
if (pkghash_get(pkg->config_files_hash, file->path) == NULL)
return (false);
if (pkghash_get(rpkg->config_files_hash, file->path) == NULL)
return (false);
return (true);
}
int
pkg_delete_files(struct pkg *pkg, struct pkg *rpkg, int flags,
struct triggers *t)
{
struct pkg_file *file = NULL;
int nfiles, cur_file = 0;
int retcode = EPKG_OK;
nfiles = pkghash_count(pkg->filehash);
if (nfiles == 0)
return (EPKG_OK);
pkg_emit_delete_files_begin(pkg);
pkg_emit_progress_start(NULL);
while (pkg_files(pkg, &file) == EPKG_OK) {
if (pkg_delete_skip_config(pkg, rpkg, file, flags))
continue;
append_touched_file(file->path);
if (pkg_emit_progress_tick(cur_file++, nfiles))
retcode = EPKG_CANCEL;
trigger_is_it_a_cleanup(t, file->path);
pkg_delete_file(pkg, file);
}
pkg_emit_progress_tick(nfiles, nfiles);
pkg_emit_delete_files_finished(pkg);
return (retcode);
}
void
pkg_delete_dir(struct pkg *pkg, struct pkg_dir *dir)
{
const char *path;
const char *prefix_rel;
size_t len;
pkg_open_root_fd(pkg);
path = dir->path;
/* remove the first / */
path++;
prefix_rel = pkg->prefix;
prefix_rel++;
len = strlen(prefix_rel);
while (len > 0 && prefix_rel[len - 1] == '/')
len--;
if ((strncmp(prefix_rel, path, len) == 0) && path[len] == '/') {
pkg_add_dir_to_del(pkg, NULL, path);
} else {
tll_push_back(pkg->dir_to_del, xstrdup(path));
}
}
int
pkg_delete_dirs(__unused struct pkgdb *db, struct pkg *pkg, struct pkg *new)
{
struct pkg_dir *dir = NULL;
while (pkg_dirs(pkg, &dir) == EPKG_OK) {
if (new != NULL && !pkg_has_dir(new, dir->path))
continue;
pkg_delete_dir(pkg, dir);
}
pkg_effective_rmdir(db, pkg);
return (EPKG_OK);
}