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#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <kvm.h>
#include <paths.h>
#include <limits.h>
#include "util.h"
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
static void usage();
static void print_jail_ids();
static void run_jail_ps(int argc, char* argv[]);
int main(int argc, char* argv[])
{
int ch = 0;
int simple = 0;
int jid = 0;
while((ch = getopt(argc, argv, "i")) != -1)
{
switch(ch)
{
case 'i':
simple = 1;
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
/* Make sure we have a jail name or id */
if(argc == 0)
usage();
if(running_in_jail())
errx(1, "can't run from inside jail");
/* Translate the jail name into an id if neccessary */
jid = translate_jail_name(argv[0]);
if(jid == -1)
errx(1, "unknown jail host name: %s", argv[0]);
argc--;
argv++;
/* Go into the jail */
if(jail_attach(jid) == -1)
err(1, "couldn't attach to jail");
if(simple)
{
if(argc > 0)
usage();
print_jail_ids();
}
else
{
/* This function never returns */
run_jail_ps(argc, argv);
}
return 0;
}
static void usage()
{
fprintf(stderr, "usage: jps [-i] jail [ ps_options ... ]\n");
exit(2);
}
static void run_jail_ps(int argc, char* argv[])
{
char** args;
int i;
if(!check_jail_command(NULL, "/bin/ps"))
exit(1);
/*
* TODO: We need to purge down the environment here.
* If the jail is in any way malicious or compromised
* then it could have replaced /bin/ps which we run...
*/
args = (char**)alloca(sizeof(char*) * (argc + 2));
args[0] = "ps";
for(i = 0; i < argc; i++)
args[i + 1] = argv[i];
args[i + 1] = NULL;
run_jail_command(NULL, "/bin/ps", args, JAIL_RUN_NOFORK);
}
static void print_jail_ids()
{
kvm_t* kd;
int nentries, i;
struct kinfo_proc* kp;
char errbuf[_POSIX2_LINE_MAX];
/* Open kernel interface */
kd = kvm_openfiles(_PATH_DEVNULL, _PATH_DEVNULL, NULL, O_RDONLY, errbuf);
if(kd == NULL)
errx(1, "couldn't connect to kernel: %s", errbuf);
/* Get all processes and print the pids */
if((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == 0)
errx(1, "couldn't list processes: %s", kvm_geterr(kd));
for(i = 0; i < nentries; i++)
{
if(kp[i].ki_pid != getpid())
printf("%d ", (int)(kp[i].ki_pid));
}
fputc('\n', stdout);
kvm_close(kd);
}
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