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#include <sys/types.h>
#include <signal.h>
#include <pwd.h>
#include <sys/resource.h>
#include <sys/wait.h>
#include <fcntl.h>
#include "dat.h"
#include "fns.h"
#include "error.h"
enum
{
Debug = 0
};
/*
* os-specific devcmd support.
* this version should be reasonably portable across Unix systems.
*/
typedef struct Targ Targ;
struct Targ
{
int fd[3]; /* fd[0] is standard input, fd[1] is standard output, fd[2] is standard error */
char** args;
char* dir;
int pid;
int wfd; /* child writes errors that occur after the fork or on exec */
int uid;
int gid;
};
extern int gidnobody;
extern int uidnobody;
static int
childproc(Targ *t)
{
#if 0 // in the FreeRTOS no any "os" cmds
int i, nfd;
if(Debug)
print("devcmd: '%s'", t->args[0]);
nfd = getdtablesize();
for(i = 0; i < nfd; i++)
if(i != t->fd[0] && i != t->fd[1] && i != t->fd[2] && i != t->wfd)
close(i);
dup2(t->fd[0], 0);
dup2(t->fd[1], 1);
dup2(t->fd[2], 2);
close(t->fd[0]);
close(t->fd[1]);
close(t->fd[2]);
/* should have an auth file to do host-specific authorisation? */
if(t->gid != -1){
if(setgid(t->gid) < 0 && getegid() == 0){
fprint(t->wfd, "can't set gid %d: %s", t->gid, strerror(errno));
_exit(1);
}
}
if(t->uid != -1){
if(setuid(t->uid) < 0 && geteuid() == 0){
fprint(t->wfd, "can't set uid %d: %s", t->uid, strerror(errno));
_exit(1);
}
}
if(t->dir != nil && chdir(t->dir) < 0){
fprint(t->wfd, "can't chdir to %s: %s", t->dir, strerror(errno));
_exit(1);
}
signal(SIGPIPE, SIG_DFL);
execvp(t->args[0], t->args);
if(Debug)
print("execvp: %s\n",strerror(errno));
fprint(t->wfd, "exec failed: %s", strerror(errno));
_exit(1);
#endif
return 0;
}
void*
oscmd(char **args, int nice, char *dir, int *fd)
{
#if 0 // in the FreeRTOS no any "os" cmds
Targ *t;
int r, fd0[2], fd1[2], fd2[2], wfd[2], n, pid;
t = mallocz(sizeof(*t), 1);
if(t == nil)
return nil;
fd0[0] = fd0[1] = -1;
fd1[0] = fd1[1] = -1;
fd2[0] = fd2[1] = -1;
wfd[0] = wfd[1] = -1;
if(pipe(fd0) < 0 || pipe(fd1) < 0 || pipe(fd2) < 0 || pipe(wfd) < 0)
goto Error;
if(fcntl(wfd[1], F_SETFD, FD_CLOEXEC) < 0) /* close on exec to give end of file on success */
goto Error;
t->fd[0] = fd0[0];
t->fd[1] = fd1[1];
t->fd[2] = fd2[1];
t->wfd = wfd[1];
t->args = args;
t->dir = dir;
t->gid = up->env->gid;
if(t->gid == -1)
t->gid = gidnobody;
t->uid = up->env->uid;
if(t->uid == -1)
t->uid = uidnobody;
signal(SIGCHLD, SIG_DFL);
switch(pid = fork()) {
case -1:
goto Error;
case 0:
setpgrp();
// if(nice)
// setpriority(PRIO_PROCESS, 0, 19);
childproc(t);
_exit(1);
default:
t->pid = pid;
if(Debug)
print("cmd pid %d\n", t->pid);
break;
}
close(fd0[0]);
close(fd1[1]);
close(fd2[1]);
close(wfd[1]);
n = read(wfd[0], up->genbuf, sizeof(up->genbuf)-1);
close(wfd[0]);
if(n > 0){
close(fd0[1]);
close(fd1[0]);
close(fd2[0]);
free(t);
up->genbuf[n] = 0;
if(Debug)
print("oscmd: bad exec: %q\n", up->genbuf);
error(up->genbuf);
return nil;
}
fd[0] = fd0[1];
fd[1] = fd1[0];
fd[2] = fd2[0];
return t;
Error:
r = errno;
if(Debug)
print("oscmd: %q\n",strerror(r));
close(fd0[0]);
close(fd0[1]);
close(fd1[0]);
close(fd1[1]);
close(fd2[0]);
close(fd2[1]);
close(wfd[0]);
close(wfd[1]);
error(strerror(r));
#endif
return nil;
}
int
oscmdkill(void *a)
{
#if 0 // in the FreeRTOS no any "os" cmds
Targ *t = a;
if(Debug)
print("kill: %d\n", t->pid);
return kill(-t->pid, SIGTERM);
#endif
return 0;
}
int
oscmdwait(void *a, char *buf, int n)
{
#if 0 // in the FreeRTOS no any "os" cmds
Targ *t = a;
int s;
if(waitpid(t->pid, &s, 0) == -1){
if(Debug)
print("wait error: %d [in %d] %q\n", t->pid, getpid(), strerror(errno));
return -1;
}
if(WIFEXITED(s)){
if(WEXITSTATUS(s) == 0)
return snprint(buf, n, "%d 0 0 0 ''", t->pid);
return snprint(buf, n, "%d 0 0 0 'exit: %d'", t->pid, WEXITSTATUS(s));
}
if(WIFSIGNALED(s)){
if(WTERMSIG(s) == SIGTERM || WTERMSIG(s) == SIGKILL)
return snprint(buf, n, "%d 0 0 0 killed", t->pid);
return snprint(buf, n, "%d 0 0 0 'signal: %d'", t->pid, WTERMSIG(s));
}
return snprint(buf, n, "%d 0 0 0 'odd status: 0x%x'", t->pid, s);
#endif
return 0;
}
void
oscmdfree(void *a)
{
free(a);
}
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