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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MGMTD Frontend Server
*
* Copyright (C) 2021 Vmware, Inc.
* Pushpasis Sarkar <spushpasis@vmware.com>
*/
#include <zebra.h>
#include "network.h"
#include "libfrr.h"
#include "mgmtd/mgmt.h"
#include "mgmtd/mgmt_fe_server.h"
#include "mgmtd/mgmt_fe_adapter.h"
#ifdef REDIRECT_DEBUG_TO_STDERR
#define MGMTD_FE_SRVR_DBG(fmt, ...) \
fprintf(stderr, "%s: " fmt "\n", __func__, ##__VA_ARGS__)
#define MGMTD_FE_SRVR_ERR(fmt, ...) \
fprintf(stderr, "%s: ERROR, " fmt "\n", __func__, ##__VA_ARGS__)
#else /* REDIRECT_DEBUG_TO_STDERR */
#define MGMTD_FE_SRVR_DBG(fmt, ...) \
do { \
if (mgmt_debug_fe) \
zlog_debug("%s: " fmt, __func__, ##__VA_ARGS__); \
} while (0)
#define MGMTD_FE_SRVR_ERR(fmt, ...) \
zlog_err("%s: ERROR: " fmt, __func__, ##__VA_ARGS__)
#endif /* REDIRECT_DEBUG_TO_STDERR */
static int mgmt_fe_listen_fd = -1;
static struct thread_master *mgmt_fe_listen_tm;
static struct event *mgmt_fe_listen_ev;
static void mgmt_fe_server_register_event(enum mgmt_fe_event event);
static void mgmt_fe_conn_accept(struct event *thread)
{
int client_conn_fd;
union sockunion su;
if (mgmt_fe_listen_fd < 0)
return;
/* We continue hearing server listen socket. */
mgmt_fe_server_register_event(MGMTD_FE_SERVER);
memset(&su, 0, sizeof(union sockunion));
/* We can handle IPv4 or IPv6 socket. */
client_conn_fd = sockunion_accept(mgmt_fe_listen_fd, &su);
if (client_conn_fd < 0) {
MGMTD_FE_SRVR_ERR(
"Failed to accept MGMTD Frontend client connection : %s",
safe_strerror(errno));
return;
}
set_nonblocking(client_conn_fd);
set_cloexec(client_conn_fd);
MGMTD_FE_SRVR_DBG("Got a new MGMTD Frontend connection");
mgmt_fe_create_adapter(client_conn_fd, &su);
}
static void mgmt_fe_server_register_event(enum mgmt_fe_event event)
{
if (event == MGMTD_FE_SERVER) {
thread_add_read(mgmt_fe_listen_tm, mgmt_fe_conn_accept,
NULL, mgmt_fe_listen_fd,
&mgmt_fe_listen_ev);
assert(mgmt_fe_listen_ev);
} else {
assert(!"mgmt_fe_server_post_event() called incorrectly");
}
}
static void mgmt_fe_server_start(const char *hostname)
{
int ret;
int sock;
struct sockaddr_un addr;
mode_t old_mask;
/* Set umask */
old_mask = umask(0077);
sock = socket(AF_UNIX, SOCK_STREAM, PF_UNSPEC);
if (sock < 0) {
MGMTD_FE_SRVR_ERR("Failed to create server socket: %s",
safe_strerror(errno));
goto mgmt_fe_server_start_failed;
}
addr.sun_family = AF_UNIX,
strlcpy(addr.sun_path, MGMTD_FE_SERVER_PATH, sizeof(addr.sun_path));
unlink(addr.sun_path);
ret = bind(sock, (struct sockaddr *)&addr, sizeof(addr));
if (ret < 0) {
MGMTD_FE_SRVR_ERR(
"Failed to bind server socket to '%s'. Err: %s",
addr.sun_path, safe_strerror(errno));
goto mgmt_fe_server_start_failed;
}
ret = listen(sock, MGMTD_FE_MAX_CONN);
if (ret < 0) {
MGMTD_FE_SRVR_ERR("Failed to listen on server socket: %s",
safe_strerror(errno));
goto mgmt_fe_server_start_failed;
}
/* Restore umask */
umask(old_mask);
mgmt_fe_listen_fd = sock;
mgmt_fe_server_register_event(MGMTD_FE_SERVER);
MGMTD_FE_SRVR_DBG("Started MGMTD Frontend Server!");
return;
mgmt_fe_server_start_failed:
if (sock)
close(sock);
mgmt_fe_listen_fd = -1;
exit(-1);
}
int mgmt_fe_server_init(struct thread_master *master)
{
if (mgmt_fe_listen_tm) {
MGMTD_FE_SRVR_DBG("MGMTD Frontend Server already running!");
return 0;
}
mgmt_fe_listen_tm = master;
mgmt_fe_server_start("localhost");
return 0;
}
void mgmt_fe_server_destroy(void)
{
if (mgmt_fe_listen_tm) {
MGMTD_FE_SRVR_DBG("Closing MGMTD Frontend Server!");
if (mgmt_fe_listen_ev) {
THREAD_OFF(mgmt_fe_listen_ev);
mgmt_fe_listen_ev = NULL;
}
if (mgmt_fe_listen_fd >= 0) {
close(mgmt_fe_listen_fd);
mgmt_fe_listen_fd = -1;
}
mgmt_fe_listen_tm = NULL;
}
}
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