/*
Unix SMB/CIFS implementation.
Winbind daemon for ntdom nss module
Copyright (C) by Tim Potter 2000-2002
Copyright (C) Andrew Tridgell 2002
Copyright (C) Jelmer Vernooij 2003
Copyright (C) Volker Lendecke 2004
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see .
*/
#include "includes.h"
#include "winbindd.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_WINBIND
bool opt_nocache = False;
static bool interactive = False;
extern bool override_logfile;
struct event_context *winbind_event_context(void)
{
static struct event_context *ctx;
if (!ctx && !(ctx = event_context_init(NULL))) {
smb_panic("Could not init winbind event context");
}
return ctx;
}
struct messaging_context *winbind_messaging_context(void)
{
static struct messaging_context *ctx;
if (ctx == NULL) {
ctx = messaging_init(NULL, server_id_self(),
winbind_event_context());
}
if (ctx == NULL) {
DEBUG(0, ("Could not init winbind messaging context.\n"));
}
return ctx;
}
/* Reload configuration */
static bool reload_services_file(const char *lfile)
{
bool ret;
if (lp_loaded()) {
const char *fname = lp_configfile();
if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
set_dyn_CONFIGFILE(fname);
}
}
/* if this is a child, restore the logfile to the special
name - , idmap, etc. */
if (lfile && *lfile) {
lp_set_logfile(lfile);
}
reopen_logs();
ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
reopen_logs();
load_interfaces();
return(ret);
}
/**************************************************************************** **
Handle a fault..
**************************************************************************** */
static void fault_quit(void)
{
dump_core();
}
static void winbindd_status(void)
{
struct winbindd_cli_state *tmp;
DEBUG(0, ("winbindd status:\n"));
/* Print client state information */
DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
DEBUG(2, ("\tclient list:\n"));
for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
(unsigned long)tmp->pid, tmp->sock));
}
}
}
/* Print winbindd status to log file */
static void print_winbindd_status(void)
{
winbindd_status();
}
/* Flush client cache */
static void flush_caches(void)
{
/* We need to invalidate cached user list entries on a SIGHUP
otherwise cached access denied errors due to restrict anonymous
hang around until the sequence number changes. */
if (!wcache_invalidate_cache()) {
DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
if (!winbindd_cache_validate_and_initialize()) {
exit(1);
}
}
}
/* Handle the signal by unlinking socket and exiting */
static void terminate(bool is_parent)
{
if (is_parent) {
/* When parent goes away we should
* remove the socket file. Not so
* when children terminate.
*/
char *path = NULL;
if (asprintf(&path, "%s/%s",
get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
unlink(path);
SAFE_FREE(path);
}
}
idmap_close();
trustdom_cache_shutdown();
#if 0
if (interactive) {
TALLOC_CTX *mem_ctx = talloc_init("end_description");
char *description = talloc_describe_all(mem_ctx);
DEBUG(3, ("tallocs left:\n%s\n", description));
talloc_destroy(mem_ctx);
}
#endif
exit(0);
}
static SIG_ATOMIC_T do_sigterm = 0;
static void termination_handler(int signum)
{
do_sigterm = 1;
sys_select_signal(signum);
}
static SIG_ATOMIC_T do_sigusr2 = 0;
static void sigusr2_handler(int signum)
{
do_sigusr2 = 1;
sys_select_signal(SIGUSR2);
}
static SIG_ATOMIC_T do_sighup = 0;
static void sighup_handler(int signum)
{
do_sighup = 1;
sys_select_signal(SIGHUP);
}
static SIG_ATOMIC_T do_sigchld = 0;
static void sigchld_handler(int signum)
{
do_sigchld = 1;
sys_select_signal(SIGCHLD);
}
/* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
static void msg_reload_services(struct messaging_context *msg,
void *private_data,
uint32_t msg_type,
struct server_id server_id,
DATA_BLOB *data)
{
/* Flush various caches */
flush_caches();
reload_services_file((const char *) private_data);
}
/* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
static void msg_shutdown(struct messaging_context *msg,
void *private_data,
uint32_t msg_type,
struct server_id server_id,
DATA_BLOB *data)
{
do_sigterm = 1;
}
static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
void *private_data,
uint32_t msg_type,
struct server_id server_id,
DATA_BLOB *data)
{
uint8 ret;
pid_t child_pid;
struct sigaction act;
struct sigaction oldact;
DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
"message.\n"));
/*
* call the validation code from a child:
* so we don't block the main winbindd and the validation
* code can safely use fork/waitpid...
*/
CatchChild();
child_pid = sys_fork();
if (child_pid == -1) {
DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
strerror(errno)));
return;
}
if (child_pid != 0) {
/* parent */
DEBUG(5, ("winbind_msg_validate_cache: child created with "
"pid %d.\n", child_pid));
return;
}
/* child */
/* install default SIGCHLD handler: validation code uses fork/waitpid */
ZERO_STRUCT(act);
act.sa_handler = SIG_DFL;
#ifdef SA_RESTART
/* We *want* SIGALRM to interrupt a system call. */
act.sa_flags = SA_RESTART;
#endif
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask,SIGCHLD);
sigaction(SIGCHLD,&act,&oldact);
ret = (uint8)winbindd_validate_cache_nobackup();
DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
(size_t)1);
_exit(0);
}
static struct winbindd_dispatch_table {
enum winbindd_cmd cmd;
void (*fn)(struct winbindd_cli_state *state);
const char *winbindd_cmd_name;
} dispatch_table[] = {
/* User functions */
{ WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
{ WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
{ WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
{ WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
{ WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
{ WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
{ WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
{ WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
"GETUSERDOMGROUPS" },
/* Group functions */
{ WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
{ WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
{ WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
{ WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
{ WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
{ WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
/* PAM auth functions */
{ WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
{ WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
{ WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
{ WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
{ WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
/* Enumeration functions */
{ WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
{ WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
{ WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
"LIST_TRUSTDOM" },
{ WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
/* SID related functions */
{ WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
{ WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
{ WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
/* Lookup related functions */
{ WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
{ WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
{ WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
{ WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
{ WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
{ WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
{ WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
{ WINBINDD_REMOVE_MAPPING, winbindd_remove_mapping, "REMOVE_MAPPING" },
{ WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
/* Miscellaneous */
{ WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
{ WINBINDD_PING, winbindd_ping, "PING" },
{ WINBINDD_INFO, winbindd_info, "INFO" },
{ WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
"INTERFACE_VERSION" },
{ WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
{ WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
{ WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
{ WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
"WINBINDD_PRIV_PIPE_DIR" },
{ WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
{ WINBINDD_DSGETDCNAME, winbindd_dsgetdcname, "DSGETDCNAME" },
/* Credential cache access */
{ WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
/* WINS functions */
{ WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
{ WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
/* End of list */
{ WINBINDD_NUM_CMDS, NULL, "NONE" }
};
static void process_request(struct winbindd_cli_state *state)
{
struct winbindd_dispatch_table *table = dispatch_table;
/* Free response data - we may be interrupted and receive another
command before being able to send this data off. */
SAFE_FREE(state->response.extra_data.data);
ZERO_STRUCT(state->response);
state->response.result = WINBINDD_PENDING;
state->response.length = sizeof(struct winbindd_response);
state->mem_ctx = talloc_init("winbind request");
if (state->mem_ctx == NULL)
return;
/* Remember who asked us. */
state->pid = state->request.pid;
/* Process command */
for (table = dispatch_table; table->fn; table++) {
if (state->request.cmd == table->cmd) {
DEBUG(10,("process_request: request fn %s\n",
table->winbindd_cmd_name ));
table->fn(state);
break;
}
}
if (!table->fn) {
DEBUG(10,("process_request: unknown request fn number %d\n",
(int)state->request.cmd ));
request_error(state);
}
}
/*
* A list of file descriptors being monitored by select in the main processing
* loop. winbindd_fd_event->handler is called whenever the socket is readable/writable.
*/
static struct winbindd_fd_event *fd_events = NULL;
void add_fd_event(struct winbindd_fd_event *ev)
{
struct winbindd_fd_event *match;
/* only add unique winbindd_fd_event structs */
for (match=fd_events; match; match=match->next ) {
#ifdef DEVELOPER
SMB_ASSERT( match != ev );
#else
if ( match == ev )
return;
#endif
}
DLIST_ADD(fd_events, ev);
}
void remove_fd_event(struct winbindd_fd_event *ev)
{
DLIST_REMOVE(fd_events, ev);
}
/*
* Handler for winbindd_fd_events to complete a read/write request, set up by
* setup_async_read/setup_async_write.
*/
static void rw_callback(struct winbindd_fd_event *event, int flags)
{
size_t todo;
ssize_t done = 0;
todo = event->length - event->done;
if (event->flags & EVENT_FD_WRITE) {
SMB_ASSERT(flags == EVENT_FD_WRITE);
done = sys_write(event->fd,
&((char *)event->data)[event->done],
todo);
if (done <= 0) {
event->flags = 0;
event->finished(event->private_data, False);
return;
}
}
if (event->flags & EVENT_FD_READ) {
SMB_ASSERT(flags == EVENT_FD_READ);
done = sys_read(event->fd, &((char *)event->data)[event->done],
todo);
if (done <= 0) {
event->flags = 0;
event->finished(event->private_data, False);
return;
}
}
event->done += done;
if (event->done == event->length) {
event->flags = 0;
event->finished(event->private_data, True);
}
}
/*
* Request an async read/write on a winbindd_fd_event structure. (*finished) is called
* when the request is completed or an error had occurred.
*/
void setup_async_read(struct winbindd_fd_event *event, void *data, size_t length,
void (*finished)(void *private_data, bool success),
void *private_data)
{
SMB_ASSERT(event->flags == 0);
event->data = data;
event->length = length;
event->done = 0;
event->handler = rw_callback;
event->finished = finished;
event->private_data = private_data;
event->flags = EVENT_FD_READ;
}
void setup_async_write(struct winbindd_fd_event *event, void *data, size_t length,
void (*finished)(void *private_data, bool success),
void *private_data)
{
SMB_ASSERT(event->flags == 0);
event->data = data;
event->length = length;
event->done = 0;
event->handler = rw_callback;
event->finished = finished;
event->private_data = private_data;
event->flags = EVENT_FD_WRITE;
}
/*
* This is the main event loop of winbind requests. It goes through a
* state-machine of 3 read/write requests, 4 if you have extra data to send.
*
* An idle winbind client has a read request of 4 bytes outstanding,
* finalizing function is request_len_recv, checking the length. request_recv
* then processes the packet. The processing function then at some point has
* to call request_finished which schedules sending the response.
*/
static void request_len_recv(void *private_data, bool success);
static void request_recv(void *private_data, bool success);
static void request_main_recv(void *private_data, bool success);
static void request_finished(struct winbindd_cli_state *state);
static void response_main_sent(void *private_data, bool success);
static void response_extra_sent(void *private_data, bool success);
static void response_extra_sent(void *private_data, bool success)
{
struct winbindd_cli_state *state =
talloc_get_type_abort(private_data, struct winbindd_cli_state);
TALLOC_FREE(state->mem_ctx);
if (!success) {
state->finished = True;
return;
}
SAFE_FREE(state->response.extra_data.data);
setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
request_len_recv, state);
}
static void response_main_sent(void *private_data, bool success)
{
struct winbindd_cli_state *state =
talloc_get_type_abort(private_data, struct winbindd_cli_state);
if (!success) {
state->finished = True;
return;
}
if (state->response.length == sizeof(state->response)) {
TALLOC_FREE(state->mem_ctx);
setup_async_read(&state->fd_event, &state->request,
sizeof(uint32), request_len_recv, state);
return;
}
setup_async_write(&state->fd_event, state->response.extra_data.data,
state->response.length - sizeof(state->response),
response_extra_sent, state);
}
static void request_finished(struct winbindd_cli_state *state)
{
/* Make sure request.extra_data is freed when finish processing a request */
SAFE_FREE(state->request.extra_data.data);
setup_async_write(&state->fd_event, &state->response,
sizeof(state->response), response_main_sent, state);
}
void request_error(struct winbindd_cli_state *state)
{
SMB_ASSERT(state->response.result == WINBINDD_PENDING);
state->response.result = WINBINDD_ERROR;
request_finished(state);
}
void request_ok(struct winbindd_cli_state *state)
{
SMB_ASSERT(state->response.result == WINBINDD_PENDING);
state->response.result = WINBINDD_OK;
request_finished(state);
}
static void request_len_recv(void *private_data, bool success)
{
struct winbindd_cli_state *state =
talloc_get_type_abort(private_data, struct winbindd_cli_state);
if (!success) {
state->finished = True;
return;
}
if (*(uint32 *)(&state->request) != sizeof(state->request)) {
DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %u)\n",
*(uint32_t *)(&state->request), (uint32_t)sizeof(state->request)));
state->finished = True;
return;
}
setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
sizeof(state->request) - sizeof(uint32),
request_main_recv, state);
}
static void request_main_recv(void *private_data, bool success)
{
struct winbindd_cli_state *state =
talloc_get_type_abort(private_data, struct winbindd_cli_state);
if (!success) {
state->finished = True;
return;
}
if (state->request.extra_len == 0) {
state->request.extra_data.data = NULL;
request_recv(state, True);
return;
}
if ((!state->privileged) &&
(state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
DEBUG(3, ("Got request with %d bytes extra data on "
"unprivileged socket\n", (int)state->request.extra_len));
state->request.extra_data.data = NULL;
state->finished = True;
return;
}
state->request.extra_data.data =
SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
if (state->request.extra_data.data == NULL) {
DEBUG(0, ("malloc failed\n"));
state->finished = True;
return;
}
/* Ensure null termination */
state->request.extra_data.data[state->request.extra_len] = '\0';
setup_async_read(&state->fd_event, state->request.extra_data.data,
state->request.extra_len, request_recv, state);
}
static void request_recv(void *private_data, bool success)
{
struct winbindd_cli_state *state =
talloc_get_type_abort(private_data, struct winbindd_cli_state);
if (!success) {
state->finished = True;
return;
}
process_request(state);
}
/* Process a new connection by adding it to the client connection list */
static void new_connection(int listen_sock, bool privileged)
{
struct sockaddr_un sunaddr;
struct winbindd_cli_state *state;
socklen_t len;
int sock;
/* Accept connection */
len = sizeof(sunaddr);
do {
sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
} while (sock == -1 && errno == EINTR);
if (sock == -1)
return;
DEBUG(6,("accepted socket %d\n", sock));
/* Create new connection structure */
if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
close(sock);
return;
}
state->sock = sock;
state->last_access = time(NULL);
state->privileged = privileged;
state->fd_event.fd = state->sock;
state->fd_event.flags = 0;
add_fd_event(&state->fd_event);
setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
request_len_recv, state);
/* Add to connection list */
winbindd_add_client(state);
}
/* Remove a client connection from client connection list */
static void remove_client(struct winbindd_cli_state *state)
{
char c = 0;
int nwritten;
/* It's a dead client - hold a funeral */
if (state == NULL) {
return;
}
/* tell client, we are closing ... */
nwritten = write(state->sock, &c, sizeof(c));
if (nwritten == -1) {
DEBUG(2, ("final write to client failed: %s\n",
strerror(errno)));
}
/* Close socket */
close(state->sock);
/* Free any getent state */
free_getent_state(state->getpwent_state);
free_getent_state(state->getgrent_state);
/* We may have some extra data that was not freed if the client was
killed unexpectedly */
SAFE_FREE(state->response.extra_data.data);
TALLOC_FREE(state->mem_ctx);
remove_fd_event(&state->fd_event);
/* Remove from list and free */
winbindd_remove_client(state);
TALLOC_FREE(state);
}
/* Shutdown client connection which has been idle for the longest time */
static bool remove_idle_client(void)
{
struct winbindd_cli_state *state, *remove_state = NULL;
time_t last_access = 0;
int nidle = 0;
for (state = winbindd_client_list(); state; state = state->next) {
if (state->response.result != WINBINDD_PENDING &&
!state->getpwent_state && !state->getgrent_state) {
nidle++;
if (!last_access || state->last_access < last_access) {
last_access = state->last_access;
remove_state = state;
}
}
}
if (remove_state) {
DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
nidle, remove_state->sock, (unsigned int)remove_state->pid));
remove_client(remove_state);
return True;
}
return False;
}
/* check if HUP has been received and reload files */
void winbind_check_sighup(const char *lfile)
{
if (do_sighup) {
DEBUG(3, ("got SIGHUP\n"));
flush_caches();
reload_services_file(lfile);
do_sighup = 0;
}
}
/* check if TERM has been received */
void winbind_check_sigterm(bool is_parent)
{
if (do_sigterm)
terminate(is_parent);
}
/* Process incoming clients on listen_sock. We use a tricky non-blocking,
non-forking, non-threaded model which allows us to handle many
simultaneous connections while remaining impervious to many denial of
service attacks. */
static void process_loop(void)
{
struct winbindd_cli_state *state;
struct winbindd_fd_event *ev;
fd_set r_fds, w_fds;
int maxfd, listen_sock, listen_priv_sock, selret;
struct timeval timeout, ev_timeout;
/* Open Sockets here to get stuff going ASAP */
listen_sock = open_winbindd_socket();
listen_priv_sock = open_winbindd_priv_socket();
if (listen_sock == -1 || listen_priv_sock == -1) {
perror("open_winbind_socket");
exit(1);
}
/* We'll be doing this a lot */
/* Handle messages */
message_dispatch(winbind_messaging_context());
run_events(winbind_event_context(), 0, NULL, NULL);
/* refresh the trusted domain cache */
rescan_trusted_domains();
/* Initialise fd lists for select() */
maxfd = MAX(listen_sock, listen_priv_sock);
FD_ZERO(&r_fds);
FD_ZERO(&w_fds);
FD_SET(listen_sock, &r_fds);
FD_SET(listen_priv_sock, &r_fds);
timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
timeout.tv_usec = 0;
/* Check for any event timeouts. */
{
struct timeval now;
GetTimeOfDay(&now);
event_add_to_select_args(winbind_event_context(), &now,
&r_fds, &w_fds, &ev_timeout, &maxfd);
}
if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
timeout = timeval_min(&timeout, &ev_timeout);
}
/* Set up client readers and writers */
state = winbindd_client_list();
while (state) {
struct winbindd_cli_state *next = state->next;
/* Dispose of client connection if it is marked as
finished */
if (state->finished)
remove_client(state);
state = next;
}
for (ev = fd_events; ev; ev = ev->next) {
if (ev->flags & EVENT_FD_READ) {
FD_SET(ev->fd, &r_fds);
maxfd = MAX(ev->fd, maxfd);
}
if (ev->flags & EVENT_FD_WRITE) {
FD_SET(ev->fd, &w_fds);
maxfd = MAX(ev->fd, maxfd);
}
}
/* Call select */
selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
if (selret == 0) {
goto no_fds_ready;
}
if (selret == -1) {
if (errno == EINTR) {
goto no_fds_ready;
}
/* Select error, something is badly wrong */
perror("select");
exit(1);
}
/* selret > 0 */
run_events(winbind_event_context(), selret, &r_fds, &w_fds);
ev = fd_events;
while (ev != NULL) {
struct winbindd_fd_event *next = ev->next;
int flags = 0;
if (FD_ISSET(ev->fd, &r_fds))
flags |= EVENT_FD_READ;
if (FD_ISSET(ev->fd, &w_fds))
flags |= EVENT_FD_WRITE;
if (flags)
ev->handler(ev, flags);
ev = next;
}
if (FD_ISSET(listen_sock, &r_fds)) {
while (winbindd_num_clients() >
WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
DEBUG(5,("winbindd: Exceeding %d client "
"connections, removing idle "
"connection.\n",
WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
if (!remove_idle_client()) {
DEBUG(0,("winbindd: Exceeding %d "
"client connections, no idle "
"connection found\n",
WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
break;
}
}
/* new, non-privileged connection */
new_connection(listen_sock, False);
}
if (FD_ISSET(listen_priv_sock, &r_fds)) {
while (winbindd_num_clients() >
WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
DEBUG(5,("winbindd: Exceeding %d client "
"connections, removing idle "
"connection.\n",
WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
if (!remove_idle_client()) {
DEBUG(0,("winbindd: Exceeding %d "
"client connections, no idle "
"connection found\n",
WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
break;
}
}
/* new, privileged connection */
new_connection(listen_priv_sock, True);
}
no_fds_ready:
run_events(winbind_event_context(), selret, &r_fds, &w_fds);
#if 0
winbindd_check_cache_size(time(NULL));
#endif
/* Check signal handling things */
winbind_check_sigterm(true);
winbind_check_sighup(NULL);
if (do_sigusr2) {
print_winbindd_status();
do_sigusr2 = 0;
}
if (do_sigchld) {
pid_t pid;
do_sigchld = 0;
while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
winbind_child_died(pid);
}
}
}
/* Main function */
int main(int argc, char **argv, char **envp)
{
static bool is_daemon = False;
static bool Fork = True;
static bool log_stdout = False;
static bool no_process_group = False;
enum {
OPT_DAEMON = 1000,
OPT_FORK,
OPT_NO_PROCESS_GROUP,
OPT_LOG_STDOUT
};
struct poptOption long_options[] = {
POPT_AUTOHELP
{ "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
{ "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
{ "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
{ "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
{ "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
{ "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
POPT_COMMON_SAMBA
POPT_TABLEEND
};
poptContext pc;
int opt;
TALLOC_CTX *frame = talloc_stackframe();
/* glibc (?) likes to print "User defined signal 1" and exit if a
SIGUSR[12] is received before a handler is installed */
CatchSignal(SIGUSR1, SIG_IGN);
CatchSignal(SIGUSR2, SIG_IGN);
fault_setup((void (*)(void *))fault_quit );
dump_core_setup("winbindd");
load_case_tables();
/* Initialise for running in non-root mode */
sec_init();
set_remote_machine_name("winbindd", False);
/* Set environment variable so we don't recursively call ourselves.
This may also be useful interactively. */
if ( !winbind_off() ) {
DEBUG(0,("Failed to disable recusive winbindd calls. Exiting.\n"));
exit(1);
}
/* Initialise samba/rpc client stuff */
pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
while ((opt = poptGetNextOpt(pc)) != -1) {
switch (opt) {
/* Don't become a daemon */
case OPT_DAEMON:
is_daemon = True;
break;
case 'i':
interactive = True;
log_stdout = True;
Fork = False;
break;
case OPT_FORK:
Fork = false;
break;
case OPT_NO_PROCESS_GROUP:
no_process_group = true;
break;
case OPT_LOG_STDOUT:
log_stdout = true;
break;
case 'n':
opt_nocache = true;
break;
default:
d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
poptBadOption(pc, 0), poptStrerror(opt));
poptPrintUsage(pc, stderr, 0);
exit(1);
}
}
if (is_daemon && interactive) {
d_fprintf(stderr,"\nERROR: "
"Option -i|--interactive is not allowed together with -D|--daemon\n\n");
poptPrintUsage(pc, stderr, 0);
exit(1);
}
if (log_stdout && Fork) {
d_fprintf(stderr, "\nERROR: "
"Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
poptPrintUsage(pc, stderr, 0);
exit(1);
}
poptFreeContext(pc);
if (!override_logfile) {
char *lfile = NULL;
if (asprintf(&lfile,"%s/log.winbindd",
get_dyn_LOGFILEBASE()) > 0) {
lp_set_logfile(lfile);
SAFE_FREE(lfile);
}
}
setup_logging("winbindd", log_stdout);
reopen_logs();
DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
DEBUG(0, ("error opening config file\n"));
exit(1);
}
/* Initialise messaging system */
if (winbind_messaging_context() == NULL) {
exit(1);
}
if (!reload_services_file(NULL)) {
DEBUG(0, ("error opening config file\n"));
exit(1);
}
if (!directory_exist(lp_lockdir())) {
mkdir(lp_lockdir(), 0755);
}
/* Setup names. */
if (!init_names())
exit(1);
load_interfaces();
if (!secrets_init()) {
DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
return False;
}
/* Enable netbios namecache */
namecache_enable();
/* Unblock all signals we are interested in as they may have been
blocked by the parent process. */
BlockSignals(False, SIGINT);
BlockSignals(False, SIGQUIT);
BlockSignals(False, SIGTERM);
BlockSignals(False, SIGUSR1);
BlockSignals(False, SIGUSR2);
BlockSignals(False, SIGHUP);
BlockSignals(False, SIGCHLD);
/* Setup signal handlers */
CatchSignal(SIGINT, termination_handler); /* Exit on these sigs */
CatchSignal(SIGQUIT, termination_handler);
CatchSignal(SIGTERM, termination_handler);
CatchSignal(SIGCHLD, sigchld_handler);
CatchSignal(SIGPIPE, SIG_IGN); /* Ignore sigpipe */
CatchSignal(SIGUSR2, sigusr2_handler); /* Debugging sigs */
CatchSignal(SIGHUP, sighup_handler);
if (!interactive)
become_daemon(Fork, no_process_group);
pidfile_create("winbindd");
#if HAVE_SETPGID
/*
* If we're interactive we want to set our own process group for
* signal management.
*/
if (interactive && !no_process_group)
setpgid( (pid_t)0, (pid_t)0);
#endif
TimeInit();
/* Don't use winbindd_reinit_after_fork here as
* we're just starting up and haven't created any
* winbindd-specific resources we must free yet. JRA.
*/
if (!reinit_after_fork(winbind_messaging_context(),
winbind_event_context(), false)) {
DEBUG(0,("reinit_after_fork() failed\n"));
exit(1);
}
/*
* Ensure all cache and idmap caches are consistent
* and initialized before we startup.
*/
if (!winbindd_cache_validate_and_initialize()) {
exit(1);
}
/* get broadcast messages */
claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
/* React on 'smbcontrol winbindd reload-config' in the same way
as to SIGHUP signal */
messaging_register(winbind_messaging_context(), NULL,
MSG_SMB_CONF_UPDATED, msg_reload_services);
messaging_register(winbind_messaging_context(), NULL,
MSG_SHUTDOWN, msg_shutdown);
/* Handle online/offline messages. */
messaging_register(winbind_messaging_context(), NULL,
MSG_WINBIND_OFFLINE, winbind_msg_offline);
messaging_register(winbind_messaging_context(), NULL,
MSG_WINBIND_ONLINE, winbind_msg_online);
messaging_register(winbind_messaging_context(), NULL,
MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
messaging_register(winbind_messaging_context(), NULL,
MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
messaging_register(winbind_messaging_context(), NULL,
MSG_WINBIND_VALIDATE_CACHE,
winbind_msg_validate_cache);
messaging_register(winbind_messaging_context(), NULL,
MSG_WINBIND_DUMP_DOMAIN_LIST,
winbind_msg_dump_domain_list);
/* Register handler for MSG_DEBUG. */
messaging_register(winbind_messaging_context(), NULL,
MSG_DEBUG,
winbind_msg_debug);
netsamlogon_cache_init(); /* Non-critical */
/* clear the cached list of trusted domains */
wcache_tdc_clear();
if (!init_domain_list()) {
DEBUG(0,("unable to initialize domain list\n"));
exit(1);
}
init_idmap_child();
init_locator_child();
smb_nscd_flush_user_cache();
smb_nscd_flush_group_cache();
/* Loop waiting for requests */
TALLOC_FREE(frame);
while (1) {
frame = talloc_stackframe();
process_loop();
TALLOC_FREE(frame);
}
return 0;
}