/* SYNTAX: EXEC [-] [-nosh] [-out | -msg <target> | -notice <target>]
[-name <name>] <cmd line>
EXEC -out | -window | -msg <target> | -notice <target> |
-close | -<signal> <id>
EXEC -in <id> <text to send to process> */
static void cmd_exec(const char *data, SERVER_REC *server, WI_ITEM_REC *item)
{
GHashTable *optlist;
char *args;
void *free_arg;
g_return_if_fail(data != NULL);
if (cmd_get_params(data, &free_arg, 1 | PARAM_FLAG_OPTIONS |
PARAM_FLAG_UNKNOWN_OPTIONS | PARAM_FLAG_GETREST,
"exec", &optlist, &args)) {
handle_exec(args, optlist, item);
cmd_params_free(free_arg);
}
}
/*
* System call handler
*
* retrieves system call number from user space
* and invokes the requested method
*/
static void
syscall_handler (struct intr_frame *f)
{
/* retrieve system call number
and switch to corresponding method */
unsigned int syscall_number = *((unsigned int*) syscall_get_kernel_address(f->esp));
switch(syscall_number)
{
/* process system calls */
case SYS_HALT:
handle_halt(f);
break;
case SYS_EXIT:
handle_exit(f);
break;
case SYS_EXEC:
handle_exec(f);
break;
case SYS_WAIT:
handle_wait(f);
break;
/* file system calls */
case SYS_CREATE:
handle_create(f);
break;
case SYS_REMOVE:
handle_remove(f);
break;
case SYS_OPEN:
handle_open(f);
break;
case SYS_FILESIZE:
handle_filesize(f);
break;
case SYS_READ:
handle_read(f);
break;
case SYS_WRITE:
handle_write(f);
break;
case SYS_SEEK:
handle_seek(f);
break;
case SYS_TELL:
handle_tell(f);
break;
case SYS_CLOSE:
handle_close(f);
break;
case SYS_CHDIR:
handle_chdir(f);
break;
case SYS_MKDIR:
handle_mkdir(f);
break;
case SYS_READDIR:
handle_readdir(f);
break;
case SYS_ISDIR:
handle_isdir(f);
break;
case SYS_INUMBER:
handle_inumber(f);
break;
default: /* SYSCALL_ERROR: */
handle_no_such_syscall(f);
break;
}
}
void driver_command_data_received(driver_command_t *driver, uint8_t *data, size_t length)
{
command_packet_t *in = NULL;
command_packet_t *out = NULL;
buffer_add_bytes(driver->stream, data, length);
while((in = command_packet_read(driver->stream)))
{
/* TUNNEL_DATA commands are too noisy to print. */
if(in->command_id != TUNNEL_DATA)
{
printf("Got a command: ");
command_packet_print(in);
}
switch(in->command_id)
{
case COMMAND_PING:
out = handle_ping(driver, in);
break;
case COMMAND_SHELL:
out = handle_shell(driver, in);
break;
case COMMAND_EXEC:
out = handle_exec(driver, in);
break;
case COMMAND_DOWNLOAD:
out = handle_download(driver, in);
break;
case COMMAND_UPLOAD:
out = handle_upload(driver, in);
break;
case COMMAND_SHUTDOWN:
out = handle_shutdown(driver, in);
break;
case COMMAND_DELAY:
out = handle_delay(driver, in);
break;
case TUNNEL_CONNECT:
out = handle_tunnel_connect(driver, in);
break;
case TUNNEL_DATA:
out = handle_tunnel_data(driver, in);
break;
case TUNNEL_CLOSE:
out = handle_tunnel_close(driver, in);
break;
case COMMAND_ERROR:
out = handle_error(driver, in);
break;
default:
LOG_ERROR("Got a command packet that we don't know how to handle!\n");
out = command_packet_create_error_response(in->request_id, 0xFFFF, "Not implemented yet!");
}
/* Respond if and only if an outgoing packet was created. */
if(out)
{
uint8_t *data;
size_t length;
if(out->command_id != TUNNEL_DATA)
{
printf("Response: ");
command_packet_print(out);
}
data = command_packet_to_bytes(out, &length);
buffer_add_bytes(driver->outgoing_data, data, length);
safe_free(data);
command_packet_destroy(out);
}
command_packet_destroy(in);
}
}
void
handle_event(Event *event) {
if (exiting == 1) {
exiting = 2;
debug(1, "ltrace about to exit");
ltrace_exiting();
}
debug(DEBUG_FUNCTION, "handle_event(pid=%d, type=%d)",
event->proc ? event->proc->pid : -1, event->type);
/* If the thread group or an individual task define an
overriding event handler, give them a chance to kick in.
We will end up calling both handlers, if the first one
doesn't sink the event. */
if (event->proc != NULL) {
event = call_handler(event->proc, event);
if (event == NULL)
/* It was handled. */
return;
/* Note: the previous handler has a chance to alter
* the event. */
if (event->proc != NULL
&& event->proc->leader != NULL
&& event->proc != event->proc->leader) {
event = call_handler(event->proc->leader, event);
if (event == NULL)
return;
}
}
switch (event->type) {
case EVENT_NONE:
debug(1, "event: none");
return;
case EVENT_SIGNAL:
debug(1, "event: signal (%s [%d])",
shortsignal(event->proc, event->e_un.signum),
event->e_un.signum);
handle_signal(event);
return;
case EVENT_EXIT:
debug(1, "event: exit (%d)", event->e_un.ret_val);
handle_exit(event);
return;
case EVENT_EXIT_SIGNAL:
debug(1, "event: exit signal (%s [%d])",
shortsignal(event->proc, event->e_un.signum),
event->e_un.signum);
handle_exit_signal(event);
return;
case EVENT_SYSCALL:
debug(1, "event: syscall (%s [%d])",
sysname(event->proc, event->e_un.sysnum),
event->e_un.sysnum);
handle_syscall(event);
return;
case EVENT_SYSRET:
debug(1, "event: sysret (%s [%d])",
sysname(event->proc, event->e_un.sysnum),
event->e_un.sysnum);
handle_sysret(event);
return;
case EVENT_ARCH_SYSCALL:
debug(1, "event: arch_syscall (%s [%d])",
arch_sysname(event->proc, event->e_un.sysnum),
event->e_un.sysnum);
handle_arch_syscall(event);
return;
case EVENT_ARCH_SYSRET:
debug(1, "event: arch_sysret (%s [%d])",
arch_sysname(event->proc, event->e_un.sysnum),
event->e_un.sysnum);
handle_arch_sysret(event);
return;
case EVENT_CLONE:
case EVENT_VFORK:
debug(1, "event: clone (%u)", event->e_un.newpid);
handle_clone(event);
return;
case EVENT_EXEC:
debug(1, "event: exec()");
handle_exec(event);
return;
case EVENT_BREAKPOINT:
debug(1, "event: breakpoint");
handle_breakpoint(event);
return;
case EVENT_NEW:
debug(1, "event: new process");
handle_new(event);
return;
default:
fprintf(stderr, "Error! unknown event?\n");
exit(1);
}
}
int handle_event(struct task *task)
{
int ret;
if (!task)
return 0;
debug(DEBUG_EVENT, "+++ process pid=%d event: %d", task->pid, task->event.type);
assert(task->stopped);
if (task->defer_func) {
ret = task->defer_func(task, task->defer_data);
if (ret == RET_DELETED)
return 1;
task->defer_func = NULL;
task->defer_data = NULL;
goto out2;
}
struct event *event = &task->event;
enum event_type type = event->type;
switch (type) {
case EVENT_NONE:
ret = continue_task(task, task->event.e_un.signum);
break;
case EVENT_SIGNAL:
ret = handle_signal(task);
break;
case EVENT_ABOUT_EXIT:
ret = handle_about_exit(task);
goto out1;
case EVENT_EXIT:
ret = handle_exit(task);
break;
case EVENT_EXIT_SIGNAL:
ret = handle_exit_signal(task);
break;
case EVENT_FORK:
case EVENT_VFORK:
case EVENT_CLONE:
ret = handle_child(task);
break;
case EVENT_EXEC:
ret = handle_exec(task);
break;
case EVENT_BREAKPOINT:
ret = handle_breakpoint(task);
goto out2;
case EVENT_NEW:
ret = handle_new(task);
break;
default:
fprintf(stderr, "fatal error, unknown event %d\n", type);
abort();
}
if (ret == RET_DELETED)
return 1;
if (ret != RET_DEFERED) {
assert(task->event.type == EVENT_NONE);
assert(task->stopped == 0);
}
out2:
assert(task->is_new == 0);
out1:
return (ret < 0) ? ret : 0;
}
