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// Copyright 2015 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "brillo/userdb_utils.h"
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <sys/types.h>
#include <unistd.h>
#include <vector>
#include <base/logging.h>
#include <base/posix/safe_strerror.h>
namespace brillo {
namespace userdb {
bool GetUserInfo(const std::string& user, uid_t* uid, gid_t* gid) {
ssize_t buf_len = sysconf(_SC_GETPW_R_SIZE_MAX);
if (buf_len < 0)
buf_len = 16384; // 16K should be enough?...
passwd pwd_buf;
passwd* pwd = nullptr;
std::vector<char> buf(buf_len);
int err_num;
do {
err_num = getpwnam_r(user.c_str(), &pwd_buf, buf.data(), buf_len, &pwd);
} while (err_num == EINTR);
if (!pwd) {
LOG(ERROR) << "Unable to find user " << user << ": "
<< (err_num ? base::safe_strerror(err_num)
: "No matching record");
return false;
}
if (uid)
*uid = pwd->pw_uid;
if (gid)
*gid = pwd->pw_gid;
return true;
}
bool GetGroupInfo(const std::string& group, gid_t* gid) {
ssize_t buf_len = sysconf(_SC_GETGR_R_SIZE_MAX);
if (buf_len < 0)
buf_len = 16384; // 16K should be enough?...
struct group grp_buf;
struct group* grp = nullptr;
std::vector<char> buf(buf_len);
int err_num;
do {
err_num = getgrnam_r(group.c_str(), &grp_buf, buf.data(), buf_len, &grp);
} while (err_num == EINTR);
if (!grp) {
LOG(ERROR) << "Unable to find group " << group << ": "
<< (err_num ? base::safe_strerror(err_num)
: "No matching record");
return false;
}
if (gid)
*gid = grp->gr_gid;
return true;
}
} // namespace userdb
} // namespace brillo
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