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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
// users.c -- operating system user information
#include <uv.h>
#include "auto/config.h"
#include "nvim/ascii.h"
#include "nvim/garray.h"
#include "nvim/memory.h"
#include "nvim/os/os.h"
#include "nvim/strings.h"
#ifdef HAVE_PWD_H
# include <pwd.h>
#endif
#ifdef WIN32
# include <lm.h>
#endif
// Add a user name to the list of users in garray_T *users.
// Do nothing if user name is NULL or empty.
static void add_user(garray_T *users, char *user, bool need_copy)
{
char *user_copy = (user != NULL && need_copy)
? xstrdup(user) : user;
if (user_copy == NULL || *user_copy == NUL) {
if (need_copy) {
xfree(user);
}
return;
}
GA_APPEND(char *, users, user_copy);
}
// Initialize users garray and fill it with os usernames.
// Return Ok for success, FAIL for failure.
int os_get_usernames(garray_T *users)
{
if (users == NULL) {
return FAIL;
}
ga_init(users, sizeof(char *), 20);
#if defined(HAVE_GETPWENT) && defined(HAVE_PWD_H)
{
struct passwd *pw;
setpwent();
while ((pw = getpwent()) != NULL) {
add_user(users, pw->pw_name, true);
}
endpwent();
}
#elif defined(WIN32)
{
DWORD nusers = 0, ntotal = 0, i;
PUSER_INFO_0 uinfo;
if (NetUserEnum(NULL, 0, 0, (LPBYTE *)&uinfo, MAX_PREFERRED_LENGTH,
&nusers, &ntotal, NULL) == NERR_Success) {
for (i = 0; i < nusers; i++) {
char *user;
int conversion_result = utf16_to_utf8(uinfo[i].usri0_name, -1, &user);
if (conversion_result != 0) {
semsg("utf16_to_utf8 failed: %d", conversion_result);
break;
}
add_user(users, user, false);
}
NetApiBufferFree(uinfo);
}
}
#endif
#if defined(HAVE_GETPWNAM)
{
const char *user_env = os_getenv("USER");
// The $USER environment variable may be a valid remote user name (NIS,
// LDAP) not already listed by getpwent(), as getpwent() only lists
// local user names. If $USER is not already listed, check whether it
// is a valid remote user name using getpwnam() and if it is, add it to
// the list of user names.
if (user_env != NULL && *user_env != NUL) {
int i;
for (i = 0; i < users->ga_len; i++) {
char *local_user = ((char **)users->ga_data)[i];
if (STRCMP(local_user, user_env) == 0) {
break;
}
}
if (i == users->ga_len) {
struct passwd *pw = getpwnam(user_env); // NOLINT
if (pw != NULL) {
add_user(users, pw->pw_name, true);
}
}
}
}
#endif
return OK;
}
// Insert user name in s[len].
// Return OK if a name found.
int os_get_user_name(char *s, size_t len)
{
#ifdef UNIX
return os_get_uname((uv_uid_t)getuid(), s, len);
#else
// TODO(equalsraf): Windows GetUserName()
return os_get_uname((uv_uid_t)0, s, len);
#endif
}
// Insert user name for "uid" in s[len].
// Return OK if a name found.
// If the name is not found, write the uid into s[len] and return FAIL.
int os_get_uname(uv_uid_t uid, char *s, size_t len)
{
#if defined(HAVE_PWD_H) && defined(HAVE_GETPWUID)
struct passwd *pw;
if ((pw = getpwuid(uid)) != NULL // NOLINT(runtime/threadsafe_fn)
&& pw->pw_name != NULL && *(pw->pw_name) != NUL) {
STRLCPY(s, pw->pw_name, len);
return OK;
}
#endif
snprintf(s, len, "%d", (int)uid);
return FAIL; // a number is not a name
}
// Returns the user directory for the given username.
// The caller has to free() the returned string.
// If the username is not found, NULL is returned.
char *os_get_user_directory(const char *name)
{
#if defined(HAVE_GETPWNAM) && defined(HAVE_PWD_H)
if (name == NULL || *name == NUL) {
return NULL;
}
struct passwd *pw = getpwnam(name); // NOLINT(runtime/threadsafe_fn)
if (pw != NULL) {
// save the string from the static passwd entry into malloced memory
return xstrdup(pw->pw_dir);
}
#endif
return NULL;
}
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