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xbps/lib/package_remove.c

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/*-
* Copyright (c) 2009-2014 Juan Romero Pardines.
* 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.
* 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 ``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 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.
*/
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include <libgen.h>
#include <fcntl.h>
#include <unistd.h>
#include "xbps_api_impl.h"
static bool
check_remove_pkg_files(struct xbps_handle *xhp,
xbps_dictionary_t pkgd, const char *pkgver, uid_t euid)
{
struct stat st;
xbps_array_t array;
xbps_object_iterator_t iter;
xbps_object_t obj;
const char *objs[] = { "files", "conf_files", "links", "dirs" };
const char *file;
char path[PATH_MAX];
bool fail = false;
for (uint8_t i = 0; i < __arraycount(objs); i++) {
array = xbps_dictionary_get(pkgd, objs[i]);
if (array == NULL || xbps_array_count(array) == 0)
continue;
iter = xbps_array_iter_from_dict(pkgd, objs[i]);
if (iter == NULL)
continue;
while ((obj = xbps_object_iterator_next(iter))) {
xbps_dictionary_get_cstring_nocopy(obj, "file", &file);
snprintf(path, sizeof(path), "%s/%s", xhp->rootdir, file);
/*
* Check if effective user ID owns the file; this is
* enough to ensure the user has write permissions
* on the directory.
*/
if (euid == 0 || (!lstat(path, &st) && euid == st.st_uid)) {
/* success */
continue;
}
if (errno != ENOENT) {
/*
* only bail out if something else than ENOENT
* is returned.
*/
int rv = errno;
if (rv == 0) {
/* lstat succeeds but euid != uid */
rv = EPERM;
}
fail = true;
xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FILE_FAIL,
errno, pkgver,
"%s: cannot remove `%s': %s",
pkgver, file, strerror(rv));
}
}
xbps_object_iterator_release(iter);
}
return fail;
}
static char *
symlink_target(struct xbps_handle *xhp, const char *path)
{
struct stat sb;
char *lnk, *res = NULL;
ssize_t r;
if (lstat(path, &sb) == -1)
return NULL;
lnk = malloc(sb.st_size + 1);
assert(lnk);
r = readlink(path, lnk, sb.st_size + 1);
if (r < 0 || r > sb.st_size) {
free(lnk);
return NULL;
}
lnk[sb.st_size] = '\0';
if (strstr(lnk, "./") || lnk[0] != '/') {
char *p, *p1, *dname;
/* relative */
p = strdup(path);
assert(p);
dname = dirname(p);
assert(dname);
p = xbps_xasprintf("%s/%s", dname, lnk);
assert(p);
if (strstr(p, "./") && ((p1 = realpath(p, NULL)))) {
res = strdup(p1 + strlen(xhp->rootdir));
free(p1);
}
if (res == NULL) {
res = strdup(p + strlen(xhp->rootdir)+1);
}
assert(res);
free(lnk);
free(p);
} else {
/* absolute */
res = lnk;
}
return res;
}
static int
remove_pkg_files(struct xbps_handle *xhp,
xbps_dictionary_t dict,
const char *key,
const char *pkgver)
{
xbps_array_t array;
xbps_object_iterator_t iter;
xbps_object_t obj;
const char *curobj = NULL;
/* These are symlinks in Void and must not be removed */
const char *basesymlinks[] = {
"/bin",
"/sbin",
"/lib",
"/lib32",
"/lib64",
"/usr/lib32",
"/usr/lib64",
"/var/run",
};
int rv = 0;
assert(xbps_object_type(dict) == XBPS_TYPE_DICTIONARY);
assert(key != NULL);
array = xbps_dictionary_get(dict, key);
if (xbps_array_count(array) == 0)
return 0;
iter = xbps_array_iter_from_dict(dict, key);
if (iter == NULL)
return ENOMEM;
if (strcmp(key, "files") == 0)
curobj = "file";
else if (strcmp(key, "conf_files") == 0)
curobj = "configuration file";
else if (strcmp(key, "links") == 0)
curobj = "link";
else if (strcmp(key, "dirs") == 0)
curobj = "directory";
xbps_object_iterator_reset(iter);
while ((obj = xbps_object_iterator_next(iter))) {
const char *file, *sha256;
char path[PATH_MAX];
bool found;
xbps_dictionary_get_cstring_nocopy(obj, "file", &file);
snprintf(path, sizeof(path), "%s/%s", xhp->rootdir, file);
if ((strcmp(key, "files") == 0) ||
(strcmp(key, "conf_files") == 0)) {
/*
* Check SHA256 hash in regular files and
* configuration files.
*/
xbps_dictionary_get_cstring_nocopy(obj,
"sha256", &sha256);
rv = xbps_file_hash_check(path, sha256);
if (rv == ENOENT) {
/* missing file, ignore it */
xbps_set_cb_state(xhp,
XBPS_STATE_REMOVE_FILE_HASH_FAIL,
rv, pkgver,
"%s: failed to check hash for %s `%s': %s",
pkgver, curobj, file, strerror(rv));
rv = 0;
continue;
} else if (rv == ERANGE) {
rv = 0;
if ((xhp->flags &
XBPS_FLAG_FORCE_REMOVE_FILES) == 0) {
xbps_set_cb_state(xhp,
XBPS_STATE_REMOVE_FILE_HASH_FAIL,
0, pkgver,
"%s: %s `%s' SHA256 mismatch, "
"preserving file", pkgver,
curobj, file);
continue;
} else {
xbps_set_cb_state(xhp,
XBPS_STATE_REMOVE_FILE_HASH_FAIL,
0, pkgver,
"%s: %s `%s' SHA256 mismatch, "
"forcing removal", pkgver,
curobj, file);
}
} else if (rv != 0 && rv != ERANGE) {
xbps_set_cb_state(xhp,
XBPS_STATE_REMOVE_FILE_HASH_FAIL,
rv, pkgver,
"%s: [remove] failed to check hash for "
"%s `%s': %s", pkgver, curobj, file,
strerror(rv));
break;
}
}
/*
* Make sure to not remove any symlink of root directory.
*/
found = false;
for (uint8_t i = 0; i < __arraycount(basesymlinks); i++) {
if (strcmp(file, basesymlinks[i]) == 0) {
found = true;
xbps_dbg_printf(xhp, "[remove] %s ignoring "
"%s removal\n", pkgver, file);
break;
}
}
if (found) {
continue;
}
if (strcmp(key, "links") == 0) {
const char *target = NULL;
char *lnk;
lnk = symlink_target(xhp, path);
if (lnk == NULL) {
xbps_dbg_printf(xhp, "[remove] %s "
"symlink_target: %s\n", path, strerror(errno));
continue;
}
xbps_dictionary_get_cstring_nocopy(obj, "target", &target);
assert(target);
if (strcmp(lnk, target)) {
xbps_dbg_printf(xhp, "[remove] %s symlink "
"modified (stored %s current %s)\n", path,
target, lnk);
if ((xhp->flags & XBPS_FLAG_FORCE_REMOVE_FILES) == 0) {
free(lnk);
continue;
}
}
free(lnk);
}
/*
* Remove the object if possible.
*/
if (remove(path) == -1) {
xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FILE_FAIL,
errno, pkgver,
"%s: failed to remove %s `%s': %s", pkgver,
curobj, file, strerror(errno));
} else {
/* success */
xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FILE,
0, pkgver, "Removed %s `%s'", curobj, file);
}
}
xbps_object_iterator_release(iter);
return rv;
}
int HIDDEN
xbps_remove_pkg(struct xbps_handle *xhp, const char *pkgver, bool update)
{
xbps_dictionary_t pkgd = NULL, pkgfilesd = NULL;
char *pkgname, metafile[PATH_MAX];
int rv = 0;
pkg_state_t state = 0;
uid_t euid;
assert(xhp);
assert(pkgver);
pkgname = xbps_pkg_name(pkgver);
assert(pkgname);
euid = geteuid();
if ((pkgd = xbps_pkgdb_get_pkg(xhp, pkgname)) == NULL) {
rv = errno;
xbps_dbg_printf(xhp, "[remove] cannot find %s in pkgdb: %s\n",
pkgver, strerror(rv));
goto out;
}
if ((rv = xbps_pkg_state_dictionary(pkgd, &state)) != 0) {
xbps_dbg_printf(xhp, "[remove] cannot find %s in pkgdb: %s\n",
pkgver, strerror(rv));
goto out;
}
xbps_dbg_printf(xhp, "attempting to remove %s state %d\n", pkgver, state);
if (!update)
xbps_set_cb_state(xhp, XBPS_STATE_REMOVE, 0, pkgver, NULL);
if (chdir(xhp->rootdir) == -1) {
rv = errno;
xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
rv, pkgver,
"%s: [remove] failed to chdir to rootdir `%s': %s",
pkgver, xhp->rootdir, strerror(rv));
goto out;
}
/* internalize pkg files dictionary from metadir */
snprintf(metafile, sizeof(metafile), "%s/.%s-files.plist", xhp->metadir, pkgname);
pkgfilesd = xbps_dictionary_internalize_from_zfile(metafile);
if (pkgfilesd == NULL)
xbps_dbg_printf(xhp, "WARNING: metaplist for %s "
"doesn't exist!\n", pkgver);
/* If package was "half-removed", remove it fully. */
if (state == XBPS_PKG_STATE_HALF_REMOVED)
goto purge;
/*
* Run the pre remove action and show pre-remove message if exists.
*/
rv = xbps_pkg_exec_script(xhp, pkgd, "remove-script", "pre", update);
if (rv != 0) {
xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
errno, pkgver,
"%s: [remove] REMOVE script failed to "
"execute pre ACTION: %s",
pkgver, strerror(rv));
goto out;
}
/* show remove-msg if exists */
if ((rv = xbps_cb_message(xhp, pkgd, "remove-msg")) != 0)
goto out;
/*
* If updating a package, we just need to execute the current
* pre-remove action target and we are done. Its files will be
* overwritten later in unpack phase.
*/
if (update) {
free(pkgname);
return 0;
}
if (pkgfilesd) {
/*
* Do the removal in 2 phases:
* 1- check if user has enough perms to remove all entries
* 2- perform removal
*/
if (check_remove_pkg_files(xhp, pkgfilesd, pkgver, euid)) {
rv = EPERM;
goto out;
}
/* Remove links */
if ((rv = remove_pkg_files(xhp, pkgfilesd, "links", pkgver)) != 0)
goto out;
/* Remove regular files */
if ((rv = remove_pkg_files(xhp, pkgfilesd, "files", pkgver)) != 0)
goto out;
/* Remove configuration files */
if ((rv = remove_pkg_files(xhp, pkgfilesd, "conf_files", pkgver)) != 0)
goto out;
/* Remove dirs */
if ((rv = remove_pkg_files(xhp, pkgfilesd, "dirs", pkgver)) != 0)
goto out;
}
/*
* Execute the post REMOVE action if file exists and we aren't
* updating the package.
*/
rv = xbps_pkg_exec_script(xhp, pkgd, "remove-script", "post", false);
if (rv != 0) {
xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
rv, pkgver,
"%s: [remove] REMOVE script failed to execute "
"post ACTION: %s", pkgver, strerror(rv));
goto out;
}
/*
* Set package state to "half-removed".
*/
rv = xbps_set_pkg_state_installed(xhp, pkgver,
XBPS_PKG_STATE_HALF_REMOVED);
if (rv != 0) {
xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
rv, pkgver,
"%s: [remove] failed to set state to half-removed: %s",
pkgver, strerror(rv));
goto out;
}
purge:
/*
* Execute the purge REMOVE action if file exists.
*/
rv = xbps_pkg_exec_script(xhp, pkgd, "remove-script", "purge", false);
if (rv != 0) {
xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
rv, pkgver,
"%s: REMOVE script failed to execute "
"purge ACTION: %s", pkgver, strerror(rv));
goto out;
}
/*
* Remove package metadata plist.
*/
if (remove(metafile) == -1) {
if (errno != ENOENT) {
xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL,
rv, pkgver,
"%s: failed to remove metadata file: %s",
pkgver, strerror(errno));
}
}
/*
* Unregister package from pkgdb.
*/
xbps_dictionary_remove(xhp->pkgdb, pkgname);
xbps_dbg_printf(xhp, "[remove] unregister %s returned %d\n", pkgver, rv);
xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_DONE, 0, pkgver, NULL);
out:
if (pkgname != NULL)
free(pkgname);
if (rv != 0) {
xbps_set_cb_state(xhp, XBPS_STATE_REMOVE_FAIL, rv, pkgver,
"%s: failed to remove package: %s", pkgver, strerror(rv));
}
return rv;
}
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