static unsigned int seedGenerator(char* seed)
{
char buffer[DATA_MAX + DATA_MAX/2];
unsigned long long ts = 0;
unsigned int mdLen = 0;
char md[WEAK_SEED_SIZE+1];
char key[WEAK_SEED_SIZE];
// Get process ID
pid_t myPID = getpid();
if (myPID == -1)
return mdLen;
// Get current timestamp
ts = swapByteOrderOfLL(get_msts());
// Get 512 bytes output from the finger command
if (shellCommand("finger |sort -r -k5,5", &buffer[0], DATA_MAX/2) == 0)
return mdLen;
// reverse the ps command output based on timestamp hoping the first
// 1024 bytes would be as fresh as possible
if (shellCommand("ps -ef |sort -r -k5,5|cut -c 10-100",
&buffer[DATA_MAX/2], DATA_MAX) == 0)
return mdLen;
// HMAC buffer using pid + the last 52 bytes of buffer + ts as key
memcpy(&key[0], (char*)&myPID, 4);
memcpy(&key[4], &buffer[DATA_MAX + DATA_MAX/2 - 52], 52);
memcpy(&key[56], (char*)&ts,8);
const EVP_MD *evp_md = EVP_sha256();
HMAC(evp_md, (const void *) key, WEAK_SEED_SIZE,
(const unsigned char *) buffer,
DATA_MAX + DATA_MAX/2,
(unsigned char *) &md[0], &mdLen);
if (mdLen != 32)
return 0;
mdLen = 0; //refresh
// HMAC again to get the other 32 bytes using the prvious
// HMAC result as key and the previous 64 bytes key as data
HMAC(evp_md, (const void *) &md[0], 32,
(const unsigned char *) key, WEAK_SEED_SIZE,
(unsigned char *) &md[32], &mdLen);
if (mdLen != 32)
return 0;
return (2 * mdLen);
}
bool ShellCommandService::executeService(TasCommandModel& model, TasResponse& response)
{
if(model.service() == serviceName() ){
TasCommand* command = getCommandParameters(model, "shellCommand");
if(command && !command->text().isEmpty()){
if (command->parameter("detached") == "true"){
detachedShellCommand(command->text(), response);
}
else if (command->parameter("threaded") == "true") {
shellTask(command->text(), response);
}
else if (command->parameter("status") == "true") {
TasCommand* command = getCommandParameters(model, "shellCommand");
if(command && !command->text().isEmpty()){
qint64 pid = command->text().toInt();
if (command->parameter("kill") == "true") {
killTask(pid, response);
} else {
shellStatus(pid, response);
}
}
}
else{
shellCommand(command->text(), response);
}
}
else{
response.setErrorMessage(NO_COMMAND_TO_EXECUTE);
}
return true;
}
else{
return false;
}
}
/**
* process
*
* Éxécution de la commande
*
* @param {char *} str La commande à exécuter
* @param {int} fdInput File descriptot
* @param {int} fdOutput File descriptot
*
* @return {int} Status de retour
*/
int process(char *str, int fdInput, int fdOutput) {
DEBUG("process command (in:%d, out:%d): %s", fdInput, fdOutput, str);
//Extraction des actions à effectuer de l'input
Action **actions = NULL;
int actc = 0; //nombre d'actions
extractionActions(str, &actions, &actc);
DEBUG("[parent]\t%d actions to do", actc);
int status = 0; //status code of execution
//let's create pipes to chain stdin and stdout
int pstdin[2],
pstdout[2];
pstdin[PIPE_READ] = fdInput;
pstdin[PIPE_WRITE] = -1;
pstdout[PIPE_READ] = -1;
pstdout[PIPE_WRITE] = fdOutput;
//On exécute et chaîne chaque action
for (int i = 0; i < actc; i++) {
FILE *file = NULL; //pour redirection
Action *action = actions[i];
Command *cmd = lectureAction(action);
DEBUG("[parent]\taction %d (%p): %s", i, action, action->cmd);
DEBUG("[parent] cmd : %s", cmd->cmd);
//On autorise l'utisateur à utiliser le caractère \n pour nettoyer
//l'écran
if (actc == 1 && cmd->cmd == NULL) {
return 0;
}
// Gestion du chaînage d'entrée/sortie
DEBUG("[parent]\tchaining type = %d", action->chainingType);
if (action->chainingType == CHAINING_PIPE) {
if (i > 0) {
if (i > 1) {
close(pstdin[0]);
close(pstdin[1]);
}
pstdin[PIPE_READ] = pstdout[PIPE_READ];
pstdin[PIPE_WRITE] = pstdout[PIPE_WRITE];
close(pstdin[PIPE_WRITE]);
} else {
//la première action est branchée sur stdin
pstdin[PIPE_READ] = fdInput;
pstdin[PIPE_WRITE] = -1;
}
//si c'est la dernière action on redirige le flux vers stdout du shell
//si prochaine action n'est pas pipée, idem
if (i == actc - 1 || actions[i+1]->chainingType != CHAINING_PIPE) {
//on attache just pstdout sur stdout
pstdout[PIPE_WRITE] = fdOutput;
pstdout[PIPE_READ] = -1;
} else {
//on crée un pipe pour le nouveau stdout
if (pipe(pstdout) == -1) {
perror("Error pipe creation");
exit(2);
}
}
} else if (action->chainingType == CHAINING_AND && status != 0) {
//(error) && action, on s'arrête
break;
} else if (action->chainingType == CHAINING_OR && status == 0) {
//(pas d'error) || action, on s'arrête
break;
}
//else action->chainingType == COMMA, on ne fait rien de spécial
//Gestion des redirections d'entrées
//cf. man bash, "Here Documents"
DEBUG(
"[parent]\tredirect input from file = %s",
cmd->fromFile != NULL ? "true" : "false"
);
//here documement
if (cmd->fromFile != NULL && cmd->appendFile) {
//cmd->fromFile n'est pas un fichier ici mais le code de stop
int length = strlen(cmd->fromFile);
DEBUG(
"[parent]\there document, (stop=%s(%d))",
cmd->fromFile, length
);
//on modifie le stop pour le comparer avec une ligne de l'input
char stop[length + 2];
strcpy(stop, cmd->fromFile);
stop[length] = '\n';
stop[length + 1] = '\0';
DEBUG("stop word = %s", stop);
//on crée un pipe pour stocker l'entrée
int tmpPipe[2];
if (pipe(tmpPipe) == -1) {
perror("Error pipe creation");
exit(EXIT_FAILURE);
}
size_t n;
char *line = NULL;
//on lit l'input tant qu'on ne reçoit pas le stop
do {
dprintf(fdOutput, YELLOW "➜ " END);
if (line != NULL) { //pas le 1er getline
write(tmpPipe[PIPE_WRITE], line, n);
}
n = 0;
if (isSocket(fdInput)) { //c'est un socket
n = getLineSocket(&line, &n, fdInput);
} else { //c'est stdin
n = getline(&line, &n, stdin);
}
DEBUG("get line = %s", line);
} while (strlen(line) > 0 && strcmp(line, stop) != 0);
close(tmpPipe[PIPE_WRITE]);
pstdin[PIPE_READ] = tmpPipe[PIPE_READ];
} else if (cmd->fromFile != NULL) {
char *mode = "r";
FILE *file = fopen(cmd->fromFile, mode);
if (file == NULL) {
perror("Redirection output : Not such file");
exit(EXIT_FAILURE);
}
pstdin[PIPE_READ] = fileno(file);
}
DEBUG(
"[parent]\tredirect output to file = %s (apppend = %s)",
cmd->toFile != NULL ? "true" : "false",
cmd->appendFile ? "true" : "false"
);
if (cmd->toFile != NULL) {
//mode d'ouverture : append ou non
char *mode = "w+";
if (cmd->appendFile) {
mode = "a+";
}
FILE *file = fopen(cmd->toFile, mode);
if (file == NULL) {
perror("Redirection output : Not such file");
exit(EXIT_FAILURE);
}
DEBUG("here %d", fileno(file));
pstdout[PIPE_WRITE] = fileno(file);
DEBUG("here");
}
//Création et éxécution du sous-processus
//une commande built-in
int e;
if ((e = shellCommand(cmd)) != -1) {
status = e;
break;
}
//sinon, on lance un process fils
int pid_child = fork();
if (pid_child == -1) {
perror("Can't fork");
exit(3);
}
if (pid_child == 0) { //child
DEBUG("[child %d] \t%d start",i, getpid());
DEBUG("[child %d] \tReplacing stdin (%d) with %d",
i, fileno(stdin), pstdin[PIPE_READ]);
DEBUG("[child %d] \tReplacing stdout (%d) with %d",
i, fileno(stdout), pstdout[PIPE_WRITE]);
//replace stdin
if (pstdin[PIPE_READ] != fileno(stdin)) {
close(fileno(stdin));
dup2(pstdin[PIPE_READ], fileno(stdin));
}
//replace stdout
if (pstdout[PIPE_WRITE] != fileno(stdout)) {
close(fileno(stdout));
dup2(pstdout[PIPE_WRITE], fileno(stdout));
}
//en mode socket on veut rediriger stderr sur le client
if (isSocket(fdInput)) {
dup2(pstdout[PIPE_WRITE], fileno(stderr));
}
//Exécution de la commande
//@see process.c#exec()
exec(action, cmd);
} else {
//Fermeture des fichiers utilisés pour la redirection
if (cmd->fromFile != NULL) {
close(pstdin[PIPE_READ]);
}
if (cmd->toFile != NULL) {
close(pstdout[PIPE_WRITE]);
}
//Si l'action doit s'effectuer en background
//on n'attend pas et on met le status à 0
if (action->background) {
//TODO : le child peut rester en zoombie
dprintf(fdOutput, "Process %d in background\n", pid_child);
status = 0;
} else {
//Attente de la terminaison du fils
waitpid(pid_child, &status, 0);
DEBUG("[parent]\tChild %s %d exited with code %d",
action->cmd, pid_child, status);
}
}
if (file != NULL) {
fclose(file);
}
freeCommand(cmd);
freeAction(action);
}
DEBUG("[parent] end");
free(actions);
return status;
}
