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/*
// AUTHOR
// N. Nielsen
//
// LICENSE
// This software is in the public domain.
//
// The software is provided "as is", without warranty of any kind,
// express or implied, including but not limited to the warranties
// of merchantability, fitness for a particular purpose, and
// noninfringement. In no event shall the author(s) be liable for any
// claim, damages, or other liability, whether in an action of
// contract, tort, or otherwise, arising from, out of, or in connection
// with the software or the use or other dealings in the software.
//
// SUPPORT
// Send bug reports to: <nielsen@memberwebs.com>
//
// CHANGES
// 0.5.1 kvm_openfiles call uses /dev/null so non root users can use
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <paths.h>
#include <stdio.h>
#include <err.h>
#include <errno.h>
#include <kvm.h>
#include <limits.h>
#include <fcntl.h>
#include "getjail.h"
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
static int listJails();
static void usage();
int main(int argc, char* argv[])
{
/* Nice main :) */
return listJails() >= 0 ? 0 : 1;
}
int listJails()
{
kvm_t *kd;
struct kinfo_proc* kp;
char errbuf[_POSIX2_LINE_MAX];
char jailName[JAIL_BUFF_SIZE];
int nentries, i;
char* jails = NULL; /* jail list buffer */
size_t nextJail = 0; /* current write positon */
size_t endJails = 0; /* size of buffer */
int numJails = 0; /* return value */
/* Open kernel interface */
kd = kvm_openfiles(_PATH_DEVNULL, _PATH_DEVNULL, _PATH_DEVNULL,
O_RDONLY, errbuf);
if(kd == 0)
errx(1, "%s", errbuf);
/* Get a process listing */
if((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == 0)
errx(1, "%s", kvm_geterr(kd));
/* Okay now loop through and look for the jails */
for(i = 0; i < nentries; i++)
{
pid_t pid;
#if __FreeBSD_version > 500000
/* Check the flags first */
if(!(kp[i].ki_flag & P_JAILED))
continue;
pid = kp[i].ki_pid;
#else
/* Check the flags first */
if(!(kp[i].kp_proc.p_flag & P_JAILED))
continue;
pid = kp[i].kp_proc.p_pid;
#endif
/* Get this processes jail name */
if(getpidjail(pid, jailName) < 0)
continue;
if(jails)
{
char* j;
/* See if that jail name was already taken */
for(j = jails; *j != NULL; j += strlen(j) + 1)
{
if(!strcmp(jailName, j))
break;
}
/* Can't do this in loop above */
if(*j)
continue;
}
/* Okay we got a jail name */
/* Allocate if necessary enough space for it */
if(nextJail + strlen(jailName) + 2 > endJails)
{
endJails += (JAIL_BUFF_SIZE * 0x2);
jails = (char*)realloc(jails, endJails);
if(!jails)
errx(1, "out of memory");
}
/* Put the jail name in the buffer */
strcpy(jails + nextJail, jailName);
nextJail += strlen(jailName) + 1;
jails[nextJail] = 0;
numJails++;
/* And print it */
fprintf(stdout, "%s\n", jailName);
}
kvm_close(kd);
return numJails;
}
static void usage()
{
fprintf(stderr, "usage: jails\n");
exit(2);
}
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