/* * klibc_fixups.c - very simple implementation of stuff missing in klibc * * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> * Copyright (C) 2004 Kay Sievers <kay@vrfy.org> * * This program 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 version 2 of the License. * * This program 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, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. * */ #ifdef __KLIBC__ #include <stdlib.h> #include <stdio.h> #include <string.h> #include <ctype.h> #include <fcntl.h> #include <sys/types.h> #include "udev.h" #include "klibc_fixups.h" #include "udev_lib.h" #include "logging.h" #define PW_FILE "/etc/passwd" #define GR_FILE "/etc/group" #define UTMP_FILE "/var/run/utmp" /* return the id of a passwd style line, selected by the users name */ static unsigned long get_id_by_name(const char *uname, const char *dbfile) { unsigned long id = -1; char line[255]; char *buf; size_t bufsize; size_t cur; size_t count; char *pos; char *name; char *idstr; char *tail; if (file_map(dbfile, &buf, &bufsize) == 0) { dbg("reading '%s' as db file", dbfile); } else { dbg("can't open '%s' as db file", dbfile); return -1; } /* loop through the whole file */ cur = 0; while (1) { count = buf_get_line(buf, bufsize, cur); strncpy(line, buf + cur, count); line[count] = '\0'; pos = line; cur += count+1; if (cur > bufsize) break; /* get name */ name = strsep(&pos, ":"); if (name == NULL) continue; /* skip pass */ if (strsep(&pos, ":") == NULL) continue; /* get id */ idstr = strsep(&pos, ":"); if (idstr == NULL) continue; if (strcmp(uname, name) == 0) { id = strtoul(idstr, &tail, 10); if (tail[0] != '\0') id = -1; else dbg("id for '%s' is '%li'", name, id); break; } } file_unmap(buf, bufsize); return id; } struct passwd *getpwnam(const char *name) { static struct passwd pw; memset(&pw, 0x00, sizeof(struct passwd)); pw.pw_uid = (uid_t) get_id_by_name(name, PW_FILE); if (pw.pw_uid < 0) return NULL; else return &pw; } struct group *getgrnam(const char *name) { static struct group gr; memset(&gr, 0x00, sizeof(struct group)); gr.gr_gid = (gid_t) get_id_by_name(name, GR_FILE); if (gr.gr_gid < 0) return NULL; else return &gr; } int ufd = -1; void setutent() { if (ufd < 0) ufd = open(UTMP_FILE, O_RDONLY); fcntl(ufd, F_SETFD, FD_CLOEXEC); lseek(ufd, 0, SEEK_SET); } void endutent() { if (ufd < 0) return; close(ufd); ufd = -1; } struct utmp *getutent(void) { static struct utmp utmp; int retval; if (ufd < 0) { setutent(); if (ufd < 0) return NULL; } retval = read(ufd, &utmp, sizeof(struct utmp)); if (retval < 1) return NULL; return &utmp; } #endif