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#include "common/io.h"
#include "common/properties.h"
#include "fastfetch.h"
#include "users.h"
#include <unistd.h>
#if FF_HAVE_UTMPX
#include <utmpx.h>
#else
// for Android compatibility
#include <utmp.h>
#define utmpx utmp
#define setutxent setutent
#define getutxent getutent
#endif
#if __linux__ || __GNU__
#include <netinet/in.h>
#include <arpa/inet.h>
#endif
#if __linux__
bool detectUserBySystemd(const FFstrbuf* pathUsers, FFlist* users) {
FF_STRBUF_AUTO_DESTROY state = ffStrbufCreate();
FF_STRBUF_AUTO_DESTROY userName = ffStrbufCreate();
FF_STRBUF_AUTO_DESTROY loginTime = ffStrbufCreate();
FF_STRBUF_AUTO_DESTROY sessions = ffStrbufCreate();
// WARNING: This is private data. Do not parse
if (!ffParsePropFileValues(pathUsers->chars, 4, (FFpropquery[]) {
{ "NAME=", &userName },
{ "STATE=", &state },
{ "REALTIME=", &loginTime },
{ "ONLINE_SESSIONS=", &sessions },
}) ||
!ffStrbufEqualS(&state, "active")) {
return false;
}
FFUserResult* user = FF_LIST_ADD(FFUserResult, *users);
ffStrbufInitMove(&user->name, &userName);
ffStrbufInit(&user->hostName);
ffStrbufInit(&user->sessionName);
ffStrbufInit(&user->clientIp);
ffStrbufSubstrBefore(&loginTime, loginTime.length - 3); // converts us to ms
user->loginTime = ffStrbufToUInt(&loginTime, 0);
FF_STRBUF_AUTO_DESTROY pathSessions = ffStrbufCreateS("/run/systemd/sessions/");
const uint32_t pathSessionsBaseLen = pathSessions.length;
FF_STRBUF_AUTO_DESTROY tty = ffStrbufCreate();
FF_STRBUF_AUTO_DESTROY remoteHost = ffStrbufCreate();
FF_STRBUF_AUTO_DESTROY service = ffStrbufCreate();
char* token = NULL;
size_t n = 0;
while (ffStrbufGetdelim(&token, &n, ' ', &sessions)) {
ffStrbufSubstrBefore(&pathSessions, pathSessionsBaseLen);
ffStrbufAppendS(&pathSessions, token);
ffStrbufClear(&remoteHost);
ffStrbufClear(&service);
ffStrbufClear(&tty);
ffStrbufClear(&loginTime);
// WARNING: This is private data. Do not parse
if (ffParsePropFileValues(pathSessions.chars, 4, (FFpropquery[]) {
{ "REMOTE_HOST=", &remoteHost },
{ "TTY=", &tty },
{ "SERVICE=", &service },
{ "REALTIME=", &loginTime },
}) &&
!ffStrbufEqualS(&service, "systemd-user")) {
if (remoteHost.length) {
ffStrbufTrimRight(&remoteHost, ']');
ffStrbufTrimLeft(&remoteHost, '[');
ffStrbufInitMove(&user->hostName, &remoteHost);
} else {
ffStrbufSetStatic(&user->hostName, "localhost");
}
ffStrbufInitMove(&user->sessionName, tty.length ? &tty : &service);
if (loginTime.length) {
ffStrbufSubstrBefore(&loginTime, loginTime.length - 3); // converts us to ms
user->loginTime = ffStrbufToUInt(&loginTime, 0);
}
break;
}
}
return true;
}
const char* detectBySystemd(FFUsersOptions* options, FFlist* users) {
// For some reason, debian/ubuntu no longer updates `/var/run/utmp` (#2064)
// Query systemd instead
FF_STRBUF_AUTO_DESTROY pathUsers = ffStrbufCreateS("/run/systemd/users/");
if (options->myselfOnly) {
ffStrbufAppendUInt(&pathUsers, instance.state.platform.uid);
detectUserBySystemd(&pathUsers, users);
} else {
const uint32_t pathUsersBaseLen = pathUsers.length;
FF_AUTO_CLOSE_DIR DIR* dirp = opendir(pathUsers.chars);
if (!dirp) {
return "opendir(\"/run/systemd/users/\") failed";
}
struct dirent* entry;
while ((entry = readdir(dirp))) {
if (entry->d_type != DT_REG) {
continue;
}
ffStrbufAppendS(&pathUsers, entry->d_name);
detectUserBySystemd(&pathUsers, users);
ffStrbufSubstrBefore(&pathUsers, pathUsersBaseLen);
}
}
return NULL;
}
#endif
#if __linux__ || __GNU__
static void fillUtmpIpAddr(FFUserResult* user, struct utmpx* n) {
bool isIpv6 = false;
for (int i = 1; i < 4; ++i) {
if (n->ut_addr_v6[i] != 0) {
isIpv6 = true;
break;
}
}
if (isIpv6) {
char ipv6_str[INET6_ADDRSTRLEN];
if (inet_ntop(AF_INET6, n->ut_addr_v6, ipv6_str, INET6_ADDRSTRLEN) != NULL) {
ffStrbufSetS(&user->clientIp, ipv6_str);
}
} else if (n->ut_addr_v6[0] != 0) {
char ipv4_str[INET_ADDRSTRLEN];
if (inet_ntop(AF_INET, n->ut_addr_v6, ipv4_str, INET_ADDRSTRLEN) != NULL) {
ffStrbufSetS(&user->clientIp, ipv4_str);
}
}
}
#else
static void fillUtmpIpAddr(FF_A_UNUSED FFUserResult* user, FF_A_UNUSED struct utmpx* n) {
}
#endif
const char* detectByUtmp(FFUsersOptions* options, FFlist* users) {
struct utmpx* n = NULL;
setutxent();
next:
while ((n = getutxent())) {
if (n->ut_type != USER_PROCESS) {
continue;
}
if (options->myselfOnly && !ffStrbufEqualS(&instance.state.platform.userName, n->ut_user)) {
continue;
}
FF_LIST_FOR_EACH (FFUserResult, user, *users) {
if (ffStrbufEqualS(&user->name, n->ut_user)) {
uint64_t newLoginTime = (uint64_t) n->ut_tv.tv_sec * 1000 + (uint64_t) n->ut_tv.tv_usec / 1000;
if (newLoginTime > user->loginTime) {
ffStrbufSetS(&user->hostName, n->ut_host);
ffStrbufSetS(&user->sessionName, n->ut_line);
fillUtmpIpAddr(user, n);
user->loginTime = newLoginTime;
}
goto next;
}
}
FFUserResult* user = FF_LIST_ADD(FFUserResult, *users);
ffStrbufInitS(&user->name, n->ut_user);
ffStrbufInitS(&user->hostName, n->ut_host);
ffStrbufInitS(&user->sessionName, n->ut_line);
ffStrbufInit(&user->clientIp);
fillUtmpIpAddr(user, n);
user->loginTime = (uint64_t) n->ut_tv.tv_sec * 1000 + (uint64_t) n->ut_tv.tv_usec / 1000;
}
endutxent();
return NULL;
}
const char* ffDetectUsers(FFUsersOptions* options, FFlist* users) {
const char* err = detectByUtmp(options, users);
if (err) {
return err;
}
#if __linux__
if (users->length == 0) {
detectBySystemd(options, users);
}
#endif
return NULL;
}
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