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// users.c -- operating system user information
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <uv.h>
#include "auto/config.h"
#include "nvim/ascii_defs.h"
#include "nvim/cmdexpand_defs.h"
#include "nvim/garray.h"
#include "nvim/memory.h"
#include "nvim/os/os.h"
#include "nvim/vim_defs.h"
#ifdef HAVE_PWD_FUNCS
# include <pwd.h>
#endif
#ifdef MSWIN
# include <lm.h>
# include "nvim/mbyte.h"
# include "nvim/message.h"
#endif
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "os/users.c.generated.h"
#endif
// All user names (for ~user completion as done by shell).
static garray_T ga_users = GA_EMPTY_INIT_VALUE;
// 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_copy);
}
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);
#ifdef HAVE_PWD_FUNCS
{
struct passwd *pw;
setpwent();
while ((pw = getpwent()) != NULL) {
add_user(users, pw->pw_name, true);
}
endpwent();
}
#elif defined(MSWIN)
{
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
#ifdef HAVE_PWD_FUNCS
{
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;
}
/// Gets the username that owns the current Nvim process.
///
/// @param s[out] Username.
/// @param len Length of `s`.
///
/// @return OK if a name found.
int os_get_username(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
}
/// Gets the username associated with `uid`.
///
/// @param uid User id.
/// @param s[out] Username, or `uid` on failure.
/// @param len Length of `s`.
///
/// @return OK if a username was found, else FAIL.
int os_get_uname(uv_uid_t uid, char *s, size_t len)
{
#ifdef HAVE_PWD_FUNCS
struct passwd *pw;
if ((pw = getpwuid(uid)) != NULL // NOLINT(runtime/threadsafe_fn)
&& pw->pw_name != NULL && *(pw->pw_name) != NUL) {
xstrlcpy(s, pw->pw_name, len);
return OK;
}
#endif
snprintf(s, len, "%d", (int)uid);
return FAIL; // a number is not a name
}
/// Gets the user directory for the given username, or NULL on failure.
///
/// Caller must free() the returned string.
char *os_get_userdir(const char *name)
{
#ifdef HAVE_PWD_FUNCS
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;
}
#if defined(EXITFREE)
void free_users(void)
{
ga_clear_strings(&ga_users);
}
#endif
/// Find all user names for user completion.
///
/// Done only once and then cached.
static void init_users(void)
{
static int lazy_init_done = false;
if (lazy_init_done) {
return;
}
lazy_init_done = true;
os_get_usernames(&ga_users);
}
/// Given to ExpandGeneric() to obtain an user names.
char *get_users(expand_T *xp, int idx)
{
init_users();
if (idx < ga_users.ga_len) {
return ((char **)ga_users.ga_data)[idx];
}
return NULL;
}
/// Check whether name matches a user name.
///
/// @return 0 if name does not match any user name.
/// 1 if name partially matches the beginning of a user name.
/// 2 is name fully matches a user name.
int match_user(char *name)
{
int n = (int)strlen(name);
int result = 0;
init_users();
for (int i = 0; i < ga_users.ga_len; i++) {
if (strcmp(((char **)ga_users.ga_data)[i], name) == 0) {
return 2; // full match
}
if (strncmp(((char **)ga_users.ga_data)[i], name, (size_t)n) == 0) {
result = 1; // partial match
}
}
return result;
}
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