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LibC: Add reentrant versions of getpw{uid,nam}

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Pretty hacky, but it should be fine.
This commit is contained in:
AnotherTest 2021-02-12 05:40:57 +03:30 • committed by Andreas Kling
parent a3a7ab83c4
commit 71054c4c06
2 changed files with 91 additions and 0 deletions
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88
Userland/Libraries/LibC/pwd.cpp
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@ -25,6 +25,7 @@
*/
#include <AK/String.h>
#include <AK/TemporaryChange.h>
#include <AK/Vector.h>
#include <errno_numbers.h>
#include <pwd.h>
@ -162,6 +163,93 @@ struct passwd* getpwent()
}
}
static void construct_pwd(struct passwd* pwd, char* buf, struct passwd** result)
{
auto* buf_name = &buf[0];
auto* buf_passwd = &buf[s_name.length() + 1];
auto* buf_gecos = &buf[s_name.length() + 1 + s_gecos.length() + 1];
auto* buf_dir = &buf[s_gecos.length() + 1 + s_name.length() + 1 + s_gecos.length() + 1];
auto* buf_shell = &buf[s_dir.length() + 1 + s_gecos.length() + 1 + s_name.length() + 1 + s_gecos.length() + 1];
bool ok = true;
ok = ok || s_name.copy_characters_to_buffer(buf_name, s_name.length() + 1);
ok = ok || s_passwd.copy_characters_to_buffer(buf_passwd, s_passwd.length() + 1);
ok = ok || s_gecos.copy_characters_to_buffer(buf_gecos, s_gecos.length() + 1);
ok = ok || s_dir.copy_characters_to_buffer(buf_dir, s_dir.length() + 1);
ok = ok || s_shell.copy_characters_to_buffer(buf_shell, s_shell.length() + 1);
ASSERT(ok);
*result = pwd;
pwd->pw_name = buf_name;
pwd->pw_passwd = buf_passwd;
pwd->pw_gecos = buf_gecos;
pwd->pw_dir = buf_dir;
pwd->pw_shell = buf_shell;
}
int getpwnam_r(const char* name, struct passwd* pwd, char* buf, size_t buflen, struct passwd** result)
{
// FIXME: This is a HACK!
TemporaryChange name_change { s_name, {} };
TemporaryChange passwd_change { s_passwd, {} };
TemporaryChange gecos_change { s_gecos, {} };
TemporaryChange dir_change { s_dir, {} };
TemporaryChange shell_change { s_shell, {} };
setpwent();
bool found = false;
while (auto* pw = getpwent()) {
if (!strcmp(pw->pw_name, name)) {
found = true;
break;
}
}
if (!found) {
*result = nullptr;
return 0;
}
const auto total_buffer_length = s_name.length() + s_passwd.length() + s_gecos.length() + s_dir.length() + s_shell.length() + 5;
if (buflen < total_buffer_length)
return ERANGE;
construct_pwd(pwd, buf, result);
return 0;
}
int getpwuid_r(uid_t uid, struct passwd* pwd, char* buf, size_t buflen, struct passwd** result)
{
// FIXME: This is a HACK!
TemporaryChange name_change { s_name, {} };
TemporaryChange passwd_change { s_passwd, {} };
TemporaryChange gecos_change { s_gecos, {} };
TemporaryChange dir_change { s_dir, {} };
TemporaryChange shell_change { s_shell, {} };
setpwent();
bool found = false;
while (auto* pw = getpwent()) {
if (pw->pw_uid == uid) {
found = true;
break;
}
}
if (!found) {
*result = nullptr;
return 0;
}
const auto total_buffer_length = s_name.length() + s_passwd.length() + s_gecos.length() + s_dir.length() + s_shell.length() + 5;
if (buflen < total_buffer_length)
return ERANGE;
construct_pwd(pwd, buf, result);
return 0;
}
int putpwent(const struct passwd* p, FILE* stream)
{
if (!p || !stream || !p->pw_passwd || !p->pw_name || !p->pw_dir || !p->pw_gecos || !p->pw_shell) {