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openocd/src/server/server.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/***************************************************************************
* Copyright (C) 2005 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* Copyright (C) 2007-2010 Øyvind Harboe *
* oyvind.harboe@zylin.com *
* *
* Copyright (C) 2008 by Spencer Oliver *
* spen@spen-soft.co.uk *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "server.h"
#include <helper/time_support.h>
#include <target/target.h>
#include <target/target_request.h>
#include <target/openrisc/jsp_server.h>
#include "openocd.h"
#include "tcl_server.h"
#include "telnet_server.h"
#include <signal.h>
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifndef _WIN32
#include <netinet/tcp.h>
#endif
static struct service *services;
enum shutdown_reason {
CONTINUE_MAIN_LOOP, /* stay in main event loop */
SHUTDOWN_REQUESTED, /* set by shutdown command; exit the event loop and quit the debugger */
SHUTDOWN_WITH_ERROR_CODE, /* set by shutdown command; quit with non-zero return code */
SHUTDOWN_WITH_SIGNAL_CODE /* set by sig_handler; exec shutdown then exit with signal as return code */
};
static enum shutdown_reason shutdown_openocd = CONTINUE_MAIN_LOOP;
/* store received signal to exit application by killing ourselves */
static int last_signal;
/* set the polling period to 100ms */
static int polling_period = 100;
/* address by name on which to listen for incoming TCP/IP connections */
static char *bindto_name;
static int add_connection(struct service *service, struct command_context *cmd_ctx)
{
socklen_t address_size;
struct connection *c, **p;
int retval;
int flag = 1;
c = malloc(sizeof(struct connection));
c->fd = -1;
c->fd_out = -1;
memset(&c->sin, 0, sizeof(c->sin));
c->cmd_ctx = copy_command_context(cmd_ctx);
c->service = service;
c->input_pending = false;
c->priv = NULL;
c->next = NULL;
if (service->type == CONNECTION_TCP) {
address_size = sizeof(c->sin);
c->fd = accept(service->fd, (struct sockaddr *)&service->sin, &address_size);
c->fd_out = c->fd;
/* This increases performance dramatically for e.g. GDB load which
* does not have a sliding window protocol.
*
* Ignore errors from this fn as it probably just means less performance
*/
setsockopt(c->fd, /* socket affected */
IPPROTO_TCP, /* set option at TCP level */
TCP_NODELAY, /* name of option */
(char *)&flag, /* the cast is historical cruft */
sizeof(int)); /* length of option value */
LOG_INFO("accepting '%s' connection on tcp/%s", service->name, service->port);
retval = service->new_connection(c);
if (retval != ERROR_OK) {
close_socket(c->fd);
LOG_ERROR("attempted '%s' connection rejected", service->name);
command_done(c->cmd_ctx);
free(c);
return retval;
}
} else if (service->type == CONNECTION_STDINOUT) {
c->fd = service->fd;
c->fd_out = fileno(stdout);
#ifdef _WIN32
/* we are using stdin/out so ignore ctrl-c under windoze */
SetConsoleCtrlHandler(NULL, TRUE);
#endif
/* do not check for new connections again on stdin */
service->fd = -1;
LOG_INFO("accepting '%s' connection from pipe", service->name);
retval = service->new_connection(c);
if (retval != ERROR_OK) {
LOG_ERROR("attempted '%s' connection rejected", service->name);
command_done(c->cmd_ctx);
free(c);
return retval;
}
} else if (service->type == CONNECTION_PIPE) {
c->fd = service->fd;
/* do not check for new connections again on stdin */
service->fd = -1;
char *out_file = alloc_printf("%so", service->port);
c->fd_out = open(out_file, O_WRONLY);
free(out_file);
if (c->fd_out == -1) {
LOG_ERROR("could not open %s", service->port);
command_done(c->cmd_ctx);
free(c);
return ERROR_FAIL;
}
LOG_INFO("accepting '%s' connection from pipe %s", service->name, service->port);
retval = service->new_connection(c);
if (retval != ERROR_OK) {
LOG_ERROR("attempted '%s' connection rejected", service->name);
command_done(c->cmd_ctx);
free(c);
return retval;
}
}
/* add to the end of linked list */
for (p = &service->connections; *p; p = &(*p)->next)
;
*p = c;
if (service->max_connections != CONNECTION_LIMIT_UNLIMITED)
service->max_connections--;
return ERROR_OK;
}
static int remove_connection(struct service *service, struct connection *connection)
{
struct connection **p = &service->connections;
struct connection *c;
/* find connection */
while ((c = *p)) {
if (c->fd == connection->fd) {
service->connection_closed(c);
if (service->type == CONNECTION_TCP)
close_socket(c->fd);
else if (service->type == CONNECTION_PIPE) {
/* The service will listen to the pipe again */
c->service->fd = c->fd;
}
command_done(c->cmd_ctx);
/* delete connection */
*p = c->next;
free(c);
if (service->max_connections != CONNECTION_LIMIT_UNLIMITED)
service->max_connections++;
break;
}
/* redirect p to next list pointer */
p = &(*p)->next;
}
return ERROR_OK;
}
static void free_service(struct service *c)
{
free(c->name);
free(c->port);
free(c);
}
int add_service(const struct service_driver *driver, const char *port,
int max_connections, void *priv)
{
struct service *c, **p;
struct hostent *hp;
int so_reuseaddr_option = 1;
c = malloc(sizeof(struct service));
c->name = strdup(driver->name);
c->port = strdup(port);
c->max_connections = 1; /* Only TCP/IP ports can support more than one connection */
c->fd = -1;
c->connections = NULL;
c->new_connection_during_keep_alive = driver->new_connection_during_keep_alive_handler;
c->new_connection = driver->new_connection_handler;
c->input = driver->input_handler;
c->connection_closed = driver->connection_closed_handler;
c->keep_client_alive = driver->keep_client_alive_handler;
c->priv = priv;
c->next = NULL;
long portnumber;
if (strcmp(c->port, "pipe") == 0)
c->type = CONNECTION_STDINOUT;
else {
char *end;
portnumber = strtol(c->port, &end, 0);
if (!*end && (parse_long(c->port, &portnumber) == ERROR_OK)) {
c->portnumber = portnumber;
c->type = CONNECTION_TCP;
} else
c->type = CONNECTION_PIPE;
}
if (c->type == CONNECTION_TCP) {
c->max_connections = max_connections;
c->fd = socket(AF_INET, SOCK_STREAM, 0);
if (c->fd == -1) {
LOG_ERROR("error creating socket: %s", strerror(errno));
free_service(c);
return ERROR_FAIL;
}
setsockopt(c->fd,
SOL_SOCKET,
SO_REUSEADDR,
(void *)&so_reuseaddr_option,
sizeof(int));
socket_nonblock(c->fd);
memset(&c->sin, 0, sizeof(c->sin));
c->sin.sin_family = AF_INET;
if (!bindto_name)
c->sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
else {
hp = gethostbyname(bindto_name);
if (!hp) {
LOG_ERROR("couldn't resolve bindto address: %s", bindto_name);
close_socket(c->fd);
free_service(c);
return ERROR_FAIL;
}
memcpy(&c->sin.sin_addr, hp->h_addr_list[0], hp->h_length);
}
c->sin.sin_port = htons(c->portnumber);
if (bind(c->fd, (struct sockaddr *)&c->sin, sizeof(c->sin)) == -1) {
LOG_ERROR("couldn't bind %s to socket on port %d: %s", c->name, c->portnumber, strerror(errno));
close_socket(c->fd);
free_service(c);
return ERROR_FAIL;
}
#ifndef _WIN32
int segsize = 65536;
setsockopt(c->fd, IPPROTO_TCP, TCP_MAXSEG, &segsize, sizeof(int));
#endif
int window_size = 128 * 1024;
/* These setsockopt()s must happen before the listen() */
setsockopt(c->fd, SOL_SOCKET, SO_SNDBUF,
(char *)&window_size, sizeof(window_size));
setsockopt(c->fd, SOL_SOCKET, SO_RCVBUF,
(char *)&window_size, sizeof(window_size));
if (listen(c->fd, 1) == -1) {
LOG_ERROR("couldn't listen on socket: %s", strerror(errno));
close_socket(c->fd);
free_service(c);
return ERROR_FAIL;
}
struct sockaddr_in addr_in;
addr_in.sin_port = 0;
socklen_t addr_in_size = sizeof(addr_in);
if (getsockname(c->fd, (struct sockaddr *)&addr_in, &addr_in_size) == 0)
LOG_INFO("Listening on port %hu for %s connections",
ntohs(addr_in.sin_port), c->name);
} else if (c->type == CONNECTION_STDINOUT) {
c->fd = fileno(stdin);
#ifdef _WIN32
/* for win32 set stdin/stdout to binary mode */
if (_setmode(_fileno(stdout), _O_BINARY) < 0)
LOG_WARNING("cannot change stdout mode to binary");
if (_setmode(_fileno(stdin), _O_BINARY) < 0)
LOG_WARNING("cannot change stdin mode to binary");
if (_setmode(_fileno(stderr), _O_BINARY) < 0)
LOG_WARNING("cannot change stderr mode to binary");
#else
socket_nonblock(c->fd);
#endif
} else if (c->type == CONNECTION_PIPE) {
#ifdef _WIN32
/* we currently do not support named pipes under win32
* so exit openocd for now */
LOG_ERROR("Named pipes currently not supported under this os");
free_service(c);
return ERROR_FAIL;
#else
/* Pipe we're reading from */
c->fd = open(c->port, O_RDONLY | O_NONBLOCK);
if (c->fd == -1) {
LOG_ERROR("could not open %s", c->port);
free_service(c);
return ERROR_FAIL;
}
#endif
}
/* add to the end of linked list */
for (p = &services; *p; p = &(*p)->next)
;
*p = c;
return ERROR_OK;
}
static void remove_connections(struct service *service)
{
struct connection *connection;
connection = service->connections;
while (connection) {
struct connection *tmp;
tmp = connection->next;
remove_connection(service, connection);
connection = tmp;
}
}
int remove_service(const char *name, const char *port)
{
struct service *tmp;
struct service *prev;
prev = services;
for (tmp = services; tmp; prev = tmp, tmp = tmp->next) {
if (!strcmp(tmp->name, name) && !strcmp(tmp->port, port)) {
remove_connections(tmp);
if (tmp == services)
services = tmp->next;
else
prev->next = tmp->next;
if (tmp->type != CONNECTION_STDINOUT)
close_socket(tmp->fd);
free(tmp->priv);
free_service(tmp);
return ERROR_OK;
}
}
return ERROR_OK;
}
static int remove_services(void)
{
struct service *c = services;
/* loop service */
while (c) {
struct service *next = c->next;
remove_connections(c);
free(c->name);
if (c->type == CONNECTION_PIPE) {
if (c->fd != -1)
close(c->fd);
}
free(c->port);
free(c->priv);
/* delete service */
free(c);
/* remember the last service for unlinking */
c = next;
}
services = NULL;
return ERROR_OK;
}
void server_keep_clients_alive(void)
{
for (struct service *s = services; s; s = s->next)
if (s->keep_client_alive)
for (struct connection *c = s->connections; c; c = c->next)
s->keep_client_alive(c);
}
int server_loop(struct command_context *command_context)
{
struct service *service;
bool poll_ok = true;
/* used in select() */
fd_set read_fds;
int fd_max;
/* used in accept() */
int retval;
int64_t next_event = timeval_ms() + polling_period;
#ifndef _WIN32
if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
LOG_ERROR("couldn't set SIGPIPE to SIG_IGN");
#endif
while (shutdown_openocd == CONTINUE_MAIN_LOOP) {
/* monitor sockets for activity */
fd_max = 0;
FD_ZERO(&read_fds);
/* add service and connection fds to read_fds */
for (service = services; service; service = service->next) {
if (service->fd != -1) {
/* listen for new connections */
FD_SET(service->fd, &read_fds);
if (service->fd > fd_max)
fd_max = service->fd;
}
if (service->connections) {
struct connection *c;
for (c = service->connections; c; c = c->next) {
/* check for activity on the connection */
FD_SET(c->fd, &read_fds);
if (c->fd > fd_max)
fd_max = c->fd;
}
}
}
struct timeval tv;
tv.tv_sec = 0;
if (poll_ok) {
/* we're just polling this iteration, this is faster on embedded
* hosts */
tv.tv_usec = 0;
retval = socket_select(fd_max + 1, &read_fds, NULL, NULL, &tv);
} else {
/* Timeout socket_select() when a target timer expires or every polling_period */
int timeout_ms = next_event - timeval_ms();
if (timeout_ms < 0)
timeout_ms = 0;
else if (timeout_ms > polling_period)
timeout_ms = polling_period;
tv.tv_usec = timeout_ms * 1000;
/* Only while we're sleeping we'll let others run */
retval = socket_select(fd_max + 1, &read_fds, NULL, NULL, &tv);
}
if (retval == -1) {
#ifdef _WIN32
errno = WSAGetLastError();
if (errno == WSAEINTR)
FD_ZERO(&read_fds);
else {
LOG_ERROR("error during select: %s", strerror(errno));
return ERROR_FAIL;
}
#else
if (errno == EINTR)
FD_ZERO(&read_fds);
else {
LOG_ERROR("error during select: %s", strerror(errno));
return ERROR_FAIL;
}
#endif
}
if (retval == 0) {
/* Execute callbacks of expired timers when
* - there was nothing to do if poll_ok was true
* - socket_select() timed out if poll_ok was false, now one or more
* timers expired or the polling period elapsed
*/
target_call_timer_callbacks();
next_event = target_timer_next_event();
process_jim_events(command_context);
FD_ZERO(&read_fds); /* eCos leaves read_fds unchanged in this case! */
/* We timed out/there was nothing to do, timeout rather than poll next time
**/
poll_ok = false;
} else {
/* There was something to do, next time we'll just poll */
poll_ok = true;
}
/* This is a simple back-off algorithm where we immediately
* re-poll if we did something this time around.
*
* This greatly improves performance of DCC.
*/
poll_ok = poll_ok || target_got_message();
for (service = services; service; service = service->next) {
/* handle new connections on listeners */
if ((service->fd != -1)
&& (FD_ISSET(service->fd, &read_fds))) {
if (service->max_connections != 0)
add_connection(service, command_context);
else {
if (service->type == CONNECTION_TCP) {
struct sockaddr_in sin;
socklen_t address_size = sizeof(sin);
int tmp_fd;
tmp_fd = accept(service->fd,
(struct sockaddr *)&service->sin,
&address_size);
close_socket(tmp_fd);
}
LOG_INFO(
"rejected '%s' connection, no more connections allowed",
service->name);
}
}
/* handle activity on connections */
if (service->connections) {
struct connection *c;
for (c = service->connections; c; ) {
if ((c->fd >= 0 && FD_ISSET(c->fd, &read_fds)) || c->input_pending) {
retval = service->input(c);
if (retval != ERROR_OK) {
struct connection *next = c->next;
if (service->type == CONNECTION_PIPE ||
service->type == CONNECTION_STDINOUT) {
/* if connection uses a pipe then
* shutdown openocd on error */
shutdown_openocd = SHUTDOWN_REQUESTED;
}
remove_connection(service, c);
LOG_INFO("dropped '%s' connection",
service->name);
c = next;
continue;
}
}
c = c->next;
}
}
}
#ifdef _WIN32
MSG msg;
while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
if (msg.message == WM_QUIT)
shutdown_openocd = SHUTDOWN_WITH_SIGNAL_CODE;
}
#endif
}
/* when quit for signal or CTRL-C, run (eventually user implemented) "shutdown" */
if (shutdown_openocd == SHUTDOWN_WITH_SIGNAL_CODE)
command_run_line(command_context, "shutdown");
return shutdown_openocd == SHUTDOWN_WITH_ERROR_CODE ? ERROR_FAIL : ERROR_OK;
}
static void sig_handler(int sig)
{
/* store only first signal that hits us */
if (shutdown_openocd == CONTINUE_MAIN_LOOP) {
shutdown_openocd = SHUTDOWN_WITH_SIGNAL_CODE;
last_signal = sig;
LOG_DEBUG("Terminating on Signal %d", sig);
} else
LOG_DEBUG("Ignored extra Signal %d", sig);
}
#ifdef _WIN32
BOOL WINAPI control_handler(DWORD ctrl_type)
{
shutdown_openocd = SHUTDOWN_WITH_SIGNAL_CODE;
return TRUE;
}
#else
static void sigkey_handler(int sig)
{
/* ignore keystroke generated signals if not in foreground process group */
if (tcgetpgrp(STDIN_FILENO) > 0)
sig_handler(sig);
else
LOG_DEBUG("Ignored Signal %d", sig);
}
#endif
int server_host_os_entry(void)
{
/* this currently only calls WSAStartup on native win32 systems
* before any socket operations are performed.
* This is an issue if you call init in your config script */
#ifdef _WIN32
WORD version_requested;
WSADATA wsadata;
version_requested = MAKEWORD(2, 2);
if (WSAStartup(version_requested, &wsadata) != 0) {
LOG_ERROR("Failed to Open Winsock");
return ERROR_FAIL;
}
#endif
return ERROR_OK;
}
int server_host_os_close(void)
{
#ifdef _WIN32
WSACleanup();
#endif
return ERROR_OK;
}
int server_preinit(void)
{
#ifdef _WIN32
/* register ctrl-c handler */
SetConsoleCtrlHandler(control_handler, TRUE);
signal(SIGBREAK, sig_handler);
signal(SIGINT, sig_handler);
#else
signal(SIGHUP, sig_handler);
signal(SIGPIPE, sig_handler);
signal(SIGQUIT, sigkey_handler);
signal(SIGINT, sigkey_handler);
#endif
signal(SIGTERM, sig_handler);
signal(SIGABRT, sig_handler);
return ERROR_OK;
}
int server_init(struct command_context *cmd_ctx)
{
int ret = tcl_init();
if (ret != ERROR_OK)
return ret;
ret = telnet_init("Open On-Chip Debugger");
if (ret != ERROR_OK) {
remove_services();
return ret;
}
return ERROR_OK;
}
int server_quit(void)
{
remove_services();
target_quit();
#ifdef _WIN32
SetConsoleCtrlHandler(control_handler, FALSE);
return ERROR_OK;
#endif
/* return signal number so we can kill ourselves */
return last_signal;
}
void server_free(void)
{
tcl_service_free();
telnet_service_free();
jsp_service_free();
free(bindto_name);
}
void exit_on_signal(int sig)
{
#ifndef _WIN32
/* bring back default system handler and kill yourself */
signal(sig, SIG_DFL);
kill(getpid(), sig);
#endif
}
int connection_write(struct connection *connection, const void *data, int len)
{
if (len == 0) {
/* successful no-op. Sockets and pipes behave differently here... */
return 0;
}
if (connection->service->type == CONNECTION_TCP)
return write_socket(connection->fd_out, data, len);
else
return write(connection->fd_out, data, len);
}
int connection_read(struct connection *connection, void *data, int len)
{
if (connection->service->type == CONNECTION_TCP)
return read_socket(connection->fd, data, len);
else
return read(connection->fd, data, len);
}
/* tell the server we want to shut down */
COMMAND_HANDLER(handle_shutdown_command)
{
LOG_USER("shutdown command invoked");
shutdown_openocd = SHUTDOWN_REQUESTED;
command_run_line(CMD_CTX, "_run_pre_shutdown_commands");
if (CMD_ARGC == 1) {
if (!strcmp(CMD_ARGV[0], "error")) {
shutdown_openocd = SHUTDOWN_WITH_ERROR_CODE;
return ERROR_FAIL;
}
}
return ERROR_COMMAND_CLOSE_CONNECTION;
}
COMMAND_HANDLER(handle_poll_period_command)
{
if (CMD_ARGC == 0)
LOG_WARNING("You need to set a period value");
else
COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], polling_period);
LOG_INFO("set servers polling period to %ums", polling_period);
return ERROR_OK;
}
COMMAND_HANDLER(handle_bindto_command)
{
switch (CMD_ARGC) {
case 0:
command_print(CMD, "bindto name: %s", bindto_name);
break;
case 1:
free(bindto_name);
bindto_name = strdup(CMD_ARGV[0]);
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
return ERROR_OK;
}
static const struct command_registration server_command_handlers[] = {
{
.name = "shutdown",
.handler = &handle_shutdown_command,
.mode = COMMAND_ANY,
.usage = "",
.help = "shut the server down",
},
{
.name = "poll_period",
.handler = &handle_poll_period_command,
.mode = COMMAND_ANY,
.usage = "",
.help = "set the servers polling period",
},
{
.name = "bindto",
.handler = &handle_bindto_command,
.mode = COMMAND_CONFIG,
.usage = "[name]",
.help = "Specify address by name on which to listen for "
"incoming TCP/IP connections",
},
COMMAND_REGISTRATION_DONE
};
int server_register_commands(struct command_context *cmd_ctx)
{
int retval = telnet_register_commands(cmd_ctx);
if (retval != ERROR_OK)
return retval;
retval = tcl_register_commands(cmd_ctx);
if (retval != ERROR_OK)
return retval;
retval = jsp_register_commands(cmd_ctx);
if (retval != ERROR_OK)
return retval;
return register_commands(cmd_ctx, NULL, server_command_handlers);
}
COMMAND_HELPER(server_port_command, unsigned short *out)
{
switch (CMD_ARGC) {
case 0:
command_print(CMD, "%d", *out);
break;
case 1:
{
uint16_t port;
COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], port);
*out = port;
break;
}
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
return ERROR_OK;
}
COMMAND_HELPER(server_pipe_command, char **out)
{
switch (CMD_ARGC) {
case 0:
command_print(CMD, "%s", *out);
break;
case 1:
{
if (CMD_CTX->mode == COMMAND_EXEC) {
LOG_WARNING("unable to change server port after init");
return ERROR_COMMAND_ARGUMENT_INVALID;
}
free(*out);
*out = strdup(CMD_ARGV[0]);
break;
}
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
return ERROR_OK;
}
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