/* * dpkg - main program for package management * statdb.c - management of database of ownership and mode of files * * Copyright © 1995 Ian Jackson * Copyright © 2000, 2001 Wichert Akkerman * Copyright © 2008-2012 Guillem Jover * * 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 . */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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--; }