void
runas(char *user, char *cmd)
{
if(becomeuser(user) < 0)
sysfatal("can't change uid for %s: %r", user);
putenv("service", "rx");
execl("/bin/rc", "rc", "-lc", cmd, nil);
sysfatal("exec /bin/rc: %r");
}
static int
remotecmd(char *rhost, char *luser, char *ruser, char *cmd)
{
int desc;
#if defined(DIRECT_RCMD)
static int port = -1;
#endif /* DIRECT_RCMD */
debugmsg(DM_MISC, "local user = %s remote user = %s\n", luser, ruser);
debugmsg(DM_MISC, "Remote command = '%s'\n", cmd);
(void) fflush(stdout);
(void) fflush(stderr);
(void) signal(SIGALRM, sighandler);
(void) alarm(RTIMEOUT);
#if defined(DIRECT_RCMD)
(void) signal(SIGPIPE, sighandler);
if (port < 0) {
struct servent *sp;
if ((sp = getservbyname("shell", "tcp")) == NULL)
fatalerr("shell/tcp: unknown service");
port = sp->s_port;
}
if (becomeroot() != 0)
exit(1);
desc = rcmd(&rhost, port, luser, ruser, cmd, 0);
if (becomeuser() != 0)
exit(1);
#else /* !DIRECT_RCMD */
debugmsg(DM_MISC, "Remote shell command = '%s'\n",
path_remsh ? path_remsh : "default");
(void) signal(SIGPIPE, SIG_IGN);
desc = rcmdsh(&rhost, -1, luser, ruser, cmd, path_remsh);
if (desc > 0)
(void) signal(SIGPIPE, sighandler);
#endif /* DIRECT_RCMD */
(void) alarm(0);
return(desc);
}
void
rexec(User *user, Job *j)
{
char buf[8*1024];
int n, fd;
AuthInfo *ai;
switch(rfork(RFPROC|RFNOWAIT|RFNAMEG|RFENVG|RFFDG)){
case 0:
break;
case -1:
clog("can't fork a job for %s: %r\n", user->name);
default:
return;
}
if(!mkcmd(j->cmd, buf, sizeof buf)){
clog("internal error: cmd buffer overflow");
_exits(0);
}
/*
* local call, auth, cmd with no i/o
*/
if(strcmp(j->host, "local") == 0){
if(becomeuser(user->name) < 0){
clog("%s: can't change uid for %s on %s: %r",
user->name, j->cmd, j->host);
_exits(0);
}
putenv("service", "rx");
clog("%s: ran '%s' on %s", user->name, j->cmd, j->host);
execl("/bin/rc", "rc", "-lc", buf, nil);
clog("%s: exec failed for %s on %s: %r",
user->name, j->cmd, j->host);
_exits(0);
}
/*
* remote call, auth, cmd with no i/o
* give it 2 min to complete
*/
alarm(2*Minute*1000);
fd = call(j->host);
if(fd < 0){
if(fd == -2)
clog("%s: dangerous host %s", user->name, j->host);
clog("%s: can't call %s: %r", user->name, j->host);
_exits(0);
}
clog("%s: called %s on %s", user->name, j->cmd, j->host);
if(becomeuser(user->name) < 0){
clog("%s: can't change uid for %s on %s: %r",
user->name, j->cmd, j->host);
_exits(0);
}
ai = auth_proxy(fd, nil, "proto=p9any role=client");
if(ai == nil){
clog("%s: can't authenticate for %s on %s: %r",
user->name, j->cmd, j->host);
_exits(0);
}
clog("%s: authenticated %s on %s", user->name, j->cmd, j->host);
write(fd, buf, strlen(buf)+1);
write(fd, buf, 0);
while((n = read(fd, buf, sizeof(buf)-1)) > 0){
buf[n] = 0;
clog("%s: %s\n", j->cmd, buf);
}
_exits(0);
}