/*
The 'channel_exec' function executes new process.
If terminal is requsted, than users shell is executed,
if exec is requested, than command 'cmd' is executed.
Process is executed under appropriate users UID.
*/
int channel_exec(const char *cmd) {
char *run[4];
char *shell;
char *name;
int fd[3];
char ln[32];
if (channel.maxpacket == 0) bug_proto();
if (channel.pid != 0 ) bug_proto();
if (channel.flagterminal) {
channel.pid = channel_forkpty(fd, channel.master, channel.slave);
if (channel.pid > 0) {
name = ptsname(fd[0]);
if (!name) bug();
if (!str_copyn(channel.termname, sizeof channel.termname, name)) bug_nomem();
}
}
else {
channel.pid = channel_fork(fd);
}
if (channel.pid == -1) return 0;
if (channel.pid == 0) {
logsys_login(channel.user, channel.remoteip, 0, 0);
if (!channel_droppriv(channel.user, &shell)) _exit(111);
if (cmd) {
run[0] = shell;
run[1] = (char *)"-c";
run[2] = (char *)cmd;
run[3] = 0;
}
else {
if (!loginshell(ln, sizeof ln, shell)) bug();
run[0] = ln;
run[1] = 0;
}
signal(SIGPIPE, SIG_DFL);
newenv_exec(shell, run);
_exit(111);
}
channel.fd0 = fd[0];
channel.fd1 = fd[1];
channel.fd2 = fd[2];
channel.len0 = 0;
newenv_purge();
if (channel.flagterminal && channel.pid > 0) channel_ptyresize(channel.a, channel.b, channel.x, channel.y);
return 1;
}
int
newenv_run(char * const argv[], char * const envp[])
{
return newenv_exec(argv[0], argv, NULL, envp);
}