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- /*
- * dpkg - main program for package management
- * statdb.c - management of database of ownership and mode of files
- *
- * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
- * Copyright © 2000, 2001 Wichert Akkerman <wakkerma@debian.org>
- * Copyright © 2008-2012 Guillem Jover <guillem@debian.org>
- *
- * This 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 2 of the License, or
- * (at your option) any later version.
- *
- * This 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 this program. If not, see <https://www.gnu.org/licenses/>.
- */
- #include <config.h>
- #include <compat.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <errno.h>
- #include <string.h>
- #include <pwd.h>
- #include <grp.h>
- #include <fcntl.h>
- #include <unistd.h>
- #include <stdlib.h>
- #include <dpkg/i18n.h>
- #include <dpkg/dpkg.h>
- #include <dpkg/dpkg-db.h>
- #include <dpkg/fdio.h>
- #include "filesdb.h"
- #include "main.h"
- static char *statoverridename;
- uid_t
- statdb_parse_uid(const char *str)
- {
- char *endptr;
- uid_t uid;
- if (str[0] == '#') {
- long int value;
- errno = 0;
- value = strtol(str + 1, &endptr, 10);
- if (str + 1 == endptr || *endptr || value < 0 || errno != 0)
- ohshit(_("invalid statoverride uid %s"), str);
- uid = (uid_t)value;
- } else {
- struct passwd *pw = getpwnam(str);
- if (pw == NULL)
- uid = (uid_t)-1;
- else
- uid = pw->pw_uid;
- }
- return uid;
- }
- gid_t
- statdb_parse_gid(const char *str)
- {
- char *endptr;
- gid_t gid;
- if (str[0] == '#') {
- long int value;
- errno = 0;
- value = strtol(str + 1, &endptr, 10);
- if (str + 1 == endptr || *endptr || value < 0 || errno != 0)
- ohshit(_("invalid statoverride gid %s"), str);
- gid = (gid_t)value;
- } else {
- struct group *gr = getgrnam(str);
- if (gr == NULL)
- gid = (gid_t)-1;
- else
- gid = gr->gr_gid;
- }
- return gid;
- }
- mode_t
- statdb_parse_mode(const char *str)
- {
- char *endptr;
- long int mode;
- mode = strtol(str, &endptr, 8);
- if (str == endptr || *endptr || mode < 0 || mode > 07777)
- ohshit(_("invalid statoverride mode %s"), str);
- return (mode_t)mode;
- }
- void
- ensure_statoverrides(enum statdb_parse_flags flags)
- {
- static struct stat sb_prev;
- struct stat sb_next;
- static FILE *file_prev;
- FILE *file;
- char *loaded_list, *loaded_list_end, *thisline, *nextline, *ptr;
- struct file_stat *fso;
- struct filenamenode *fnn;
- struct fileiterator *iter;
- if (statoverridename == NULL)
- statoverridename = dpkg_db_get_path(STATOVERRIDEFILE);
- onerr_abort++;
- file = fopen(statoverridename, "r");
- if (!file) {
- if (errno != ENOENT)
- ohshite(_("failed to open statoverride file"));
- } else {
- setcloexec(fileno(file), statoverridename);
- if (fstat(fileno(file), &sb_next))
- ohshite(_("failed to fstat statoverride file"));
- /*
- * We need to keep the database file open so that the
- * filesystem cannot reuse the inode number (f.ex. during
- * multiple dpkg-statoverride invocations in a maintainer
- * script), otherwise the following check might turn true,
- * and we would skip reloading a modified database.
- */
- if (file_prev &&
- sb_prev.st_dev == sb_next.st_dev &&
- sb_prev.st_ino == sb_next.st_ino) {
- fclose(file);
- onerr_abort--;
- debug(dbg_general, "%s: same, skipping", __func__);
- return;
- }
- sb_prev = sb_next;
- }
- if (file_prev)
- fclose(file_prev);
- file_prev = file;
- /* Reset statoverride information. */
- iter = files_db_iter_new();
- while ((fnn = files_db_iter_next(iter)))
- fnn->statoverride = NULL;
- files_db_iter_free(iter);
- if (!file) {
- onerr_abort--;
- debug(dbg_general, "%s: none, resetting", __func__);
- return;
- }
- debug(dbg_general, "%s: new, (re)loading", __func__);
- /* If the statoverride list is empty we don't need to bother
- * reading it. */
- if (!sb_next.st_size) {
- onerr_abort--;
- return;
- }
- loaded_list = m_malloc(sb_next.st_size);
- loaded_list_end = loaded_list + sb_next.st_size;
- if (fd_read(fileno(file), loaded_list, sb_next.st_size) < 0)
- ohshite(_("reading statoverride file '%.250s'"), statoverridename);
- thisline = loaded_list;
- while (thisline < loaded_list_end) {
- fso = nfmalloc(sizeof(struct file_stat));
- ptr = memchr(thisline, '\n', loaded_list_end - thisline);
- if (ptr == NULL)
- ohshit(_("statoverride file is missing final newline"));
- /* Where to start next time around. */
- nextline = ptr + 1;
- if (ptr == thisline)
- ohshit(_("statoverride file contains empty line"));
- *ptr = '\0';
- /* Extract the uid. */
- ptr = memchr(thisline, ' ', nextline - thisline);
- if (ptr == NULL)
- ohshit(_("syntax error in statoverride file"));
- *ptr = '\0';
- fso->uid = statdb_parse_uid(thisline);
- if (fso->uid == (uid_t)-1)
- fso->uname = nfstrsave(thisline);
- else
- fso->uname = NULL;
- if (fso->uid == (uid_t)-1 && !(flags & STATDB_PARSE_LAX))
- ohshit(_("unknown user '%s' in statoverride file"),
- thisline);
- /* Move to the next bit */
- thisline = ptr + 1;
- if (thisline >= loaded_list_end)
- ohshit(_("unexpected end of line in statoverride file"));
- /* Extract the gid */
- ptr = memchr(thisline, ' ', nextline - thisline);
- if (ptr == NULL)
- ohshit(_("syntax error in statoverride file"));
- *ptr = '\0';
- fso->gid = statdb_parse_gid(thisline);
- if (fso->gid == (gid_t)-1)
- fso->gname = nfstrsave(thisline);
- else
- fso->gname = NULL;
- if (fso->gid == (gid_t)-1 && !(flags & STATDB_PARSE_LAX))
- ohshit(_("unknown group '%s' in statoverride file"),
- thisline);
- /* Move to the next bit */
- thisline = ptr + 1;
- if (thisline >= loaded_list_end)
- ohshit(_("unexpected end of line in statoverride file"));
- /* Extract the mode */
- ptr = memchr(thisline, ' ', nextline - thisline);
- if (ptr == NULL)
- ohshit(_("syntax error in statoverride file"));
- *ptr = '\0';
- fso->mode = statdb_parse_mode(thisline);
- /* Move to the next bit */
- thisline = ptr + 1;
- if (thisline >= loaded_list_end)
- ohshit(_("unexpected end of line in statoverride file"));
- fnn = findnamenode(thisline, 0);
- if (fnn->statoverride)
- ohshit(_("multiple statoverrides present for file '%.250s'"),
- thisline);
- fnn->statoverride = fso;
- /* Moving on... */
- thisline = nextline;
- }
- free(loaded_list);
- onerr_abort--;
- }
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