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Libraries: Move to Userland/Libraries/
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1857 changed files with 266 additions and 274 deletions
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/String.h>
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#include <AK/Vector.h>
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#include <errno_numbers.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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extern "C" {
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static FILE* s_stream = nullptr;
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static unsigned s_line_number = 0;
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static struct passwd s_passwd_entry;
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static String s_name;
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static String s_passwd;
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static String s_gecos;
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static String s_dir;
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static String s_shell;
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void setpwent()
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{
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s_line_number = 0;
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if (s_stream) {
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rewind(s_stream);
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} else {
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s_stream = fopen("/etc/passwd", "r");
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if (!s_stream) {
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perror("open /etc/passwd");
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}
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}
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}
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void endpwent()
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{
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s_line_number = 0;
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if (s_stream) {
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fclose(s_stream);
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s_stream = nullptr;
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}
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memset(&s_passwd_entry, 0, sizeof(s_passwd_entry));
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s_name = {};
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s_passwd = {};
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s_gecos = {};
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s_dir = {};
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s_shell = {};
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}
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struct passwd* getpwuid(uid_t uid)
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{
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setpwent();
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while (auto* pw = getpwent()) {
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if (pw->pw_uid == uid)
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return pw;
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}
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return nullptr;
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}
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struct passwd* getpwnam(const char* name)
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{
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setpwent();
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while (auto* pw = getpwent()) {
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if (!strcmp(pw->pw_name, name))
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return pw;
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}
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return nullptr;
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}
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static bool parse_pwddb_entry(const String& line)
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{
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auto parts = line.split_view(':', true);
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if (parts.size() != 7) {
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fprintf(stderr, "getpwent(): Malformed entry on line %u\n", s_line_number);
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return false;
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}
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s_name = parts[0];
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s_passwd = parts[1];
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auto& uid_string = parts[2];
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auto& gid_string = parts[3];
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s_gecos = parts[4];
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s_dir = parts[5];
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s_shell = parts[6];
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auto uid = uid_string.to_uint();
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if (!uid.has_value()) {
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fprintf(stderr, "getpwent(): Malformed UID on line %u\n", s_line_number);
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return false;
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}
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auto gid = gid_string.to_uint();
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if (!gid.has_value()) {
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fprintf(stderr, "getpwent(): Malformed GID on line %u\n", s_line_number);
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return false;
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}
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s_passwd_entry.pw_name = const_cast<char*>(s_name.characters());
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s_passwd_entry.pw_passwd = const_cast<char*>(s_passwd.characters());
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s_passwd_entry.pw_uid = uid.value();
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s_passwd_entry.pw_gid = gid.value();
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s_passwd_entry.pw_gecos = const_cast<char*>(s_gecos.characters());
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s_passwd_entry.pw_dir = const_cast<char*>(s_dir.characters());
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s_passwd_entry.pw_shell = const_cast<char*>(s_shell.characters());
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return true;
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}
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struct passwd* getpwent()
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{
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if (!s_stream)
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setpwent();
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while (true) {
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if (!s_stream || feof(s_stream))
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return nullptr;
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if (ferror(s_stream)) {
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fprintf(stderr, "getpwent(): Read error: %s\n", strerror(ferror(s_stream)));
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return nullptr;
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}
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char buffer[1024];
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++s_line_number;
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char* s = fgets(buffer, sizeof(buffer), s_stream);
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// Silently tolerate an empty line at the end.
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if ((!s || !s[0]) && feof(s_stream))
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return nullptr;
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String line(s, Chomp);
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if (parse_pwddb_entry(line))
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return &s_passwd_entry;
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// Otherwise, proceed to the next line.
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}
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}
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int putpwent(const struct passwd* p, FILE* stream)
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{
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if (!p || !stream || !p->pw_passwd || !p->pw_name || !p->pw_dir || !p->pw_gecos || !p->pw_shell) {
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errno = EINVAL;
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return -1;
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}
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auto is_valid_field = [](const char* str) {
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return str && !strpbrk(str, ":\n");
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};
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if (!is_valid_field(p->pw_name) || !is_valid_field(p->pw_dir) || !is_valid_field(p->pw_gecos) || !is_valid_field(p->pw_shell)) {
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errno = EINVAL;
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return -1;
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}
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int nwritten = fprintf(stream, "%s:%s:%u:%u:%s,,,:%s:%s\n", p->pw_name, p->pw_passwd, p->pw_uid, p->pw_gid, p->pw_gecos, p->pw_dir, p->pw_shell);
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if (!nwritten || nwritten < 0) {
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errno = ferror(stream);
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return -1;
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}
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return 0;
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}
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}
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