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/*
* udev_libc_wrapper - wrapping of functions missing in a specific libc
* or not working in a statically compiled binary
*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2005 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.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include "udev.h"
#ifndef __GLIBC__
#define __OWN_USERDB_PARSER__
#endif
#ifdef __GLIBC__
#define __OWN_STRLCPYCAT__
#endif
#ifdef USE_STATIC
#define __OWN_USERDB_PARSER__
#endif
#ifdef __OWN_STRLCPYCAT__
size_t strlcpy(char *dst, const char *src, size_t size)
{
size_t bytes = 0;
char *q = dst;
const char *p = src;
char ch;
while ((ch = *p++)) {
if (bytes+1 < size)
*q++ = ch;
bytes++;
}
/* If size == 0 there is no space for a final null... */
if (size)
*q = '\0';
return bytes;
}
size_t strlcat(char *dst, const char *src, size_t size)
{
size_t bytes = 0;
char *q = dst;
const char *p = src;
char ch;
while (bytes < size && *q) {
q++;
bytes++;
}
if (bytes == size)
return (bytes + strlen(src));
while ((ch = *p++)) {
if (bytes+1 < size)
*q++ = ch;
bytes++;
}
*q = '\0';
return bytes;
}
#endif /* __OWN_STRLCPYCAT__ */
#ifndef __OWN_USERDB_PARSER__
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
uid_t lookup_user(const char *user)
{
struct passwd *pw;
uid_t uid = 0;
pw = getpwnam(user);
if (pw == NULL)
err("error resolving user '%s': %s", user, strerror(errno));
else
uid = pw->pw_uid;
return uid;
}
gid_t lookup_group(const char *group)
{
struct group *gr;
gid_t gid = 0;
gr = getgrnam(group);
if (gr == NULL)
err("error resolving group '%s': %s", group, strerror(errno));
else
gid = gr->gr_gid;
return gid;
}
#else /* __OWN_USERDB_PARSER__ */
#define PASSWD_FILE "/etc/passwd"
#define GROUP_FILE "/etc/group"
/* 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 = 0;
char line[LINE_SIZE];
char *buf;
char *bufline;
size_t bufsize;
size_t cur;
size_t count;
char *pos;
char *name;
char *idstr;
char *tail;
if (file_map(dbfile, &buf, &bufsize) != 0) {
err("can't open '%s' as db file: %s", dbfile, strerror(errno));
return 0;
}
dbg("search '%s' in '%s'", uname, dbfile);
/* loop through the whole file */
cur = 0;
while (cur < bufsize) {
count = buf_get_line(buf, bufsize, cur);
bufline = &buf[cur];
cur += count+1;
if (count >= sizeof(line))
continue;
memcpy(line, bufline, count-1);
line[count-1] = '\0';
pos = line;
/* 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 = 0;
dbg("no id found for '%s'", name);
} else
dbg("id for '%s' is '%li'", name, id);
break;
}
}
file_unmap(buf, bufsize);
return id;
}
uid_t lookup_user(const char *user)
{
unsigned long id;
id = get_id_by_name(user, PASSWD_FILE);
return (uid_t) id;
}
gid_t lookup_group(const char *group)
{
unsigned long id;
id = get_id_by_name(group, GROUP_FILE);
return (gid_t) id;
}
#endif /* __OWN_USERDB_PARSER__ */
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