gistfile1.c

#include <sys/param.h>
#include <sys/jail.h>
#include <sys/uio.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <stdio.h>

int
main(void)
{
        struct iovec fbsd_jparams[10];
        struct in_addr ip4;
        int fbsd_lastjid = 0;
        char path[MAXPATHLEN], hostname[MAXHOSTNAMELEN], name[MAXHOSTNAMELEN];

        *(const void **) &fbsd_jparams[0].iov_base = "lastjid";
        fbsd_jparams[0].iov_len = sizeof("lastjid");
        fbsd_jparams[1].iov_base = &fbsd_lastjid;
        fbsd_jparams[1].iov_len = sizeof(fbsd_lastjid);

        *(const void **) &fbsd_jparams[2].iov_base = "path";
        fbsd_jparams[2].iov_len = sizeof("path");
        fbsd_jparams[3].iov_base = &path;
        fbsd_jparams[3].iov_len = MAXPATHLEN;

        *(const void **) &fbsd_jparams[4].iov_base = "host.hostname";
        fbsd_jparams[4].iov_len = sizeof("host.hostname");
        fbsd_jparams[5].iov_base = &hostname;
        fbsd_jparams[5].iov_len = MAXHOSTNAMELEN;

        *(const void **) &fbsd_jparams[6].iov_base = "name";
        fbsd_jparams[6].iov_len = sizeof("name");
        fbsd_jparams[7].iov_base = &name;
        fbsd_jparams[7].iov_len = MAXHOSTNAMELEN;

        *(const void **) &fbsd_jparams[8].iov_base = "ip4.addr";
        fbsd_jparams[8].iov_len = sizeof("ip4.addr");
        fbsd_jparams[9].iov_base = &ip4;
        fbsd_jparams[9].iov_len = sizeof(struct in_addr);

        while ((fbsd_lastjid = jail_get(fbsd_jparams, 10, 0)) > 0) {
                printf("JID: %-5d Name: %-20s IP: %-20s Path: %-20s Hostname: %-20s\n", fbsd_lastjid, name, inet_ntoa(ip4), path, hostname);
        }

        return (0);
}