path: root/util/bbsrf.c

/* $Id$ */

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/param.h>
#include <sys/types.h>
#include <utmp.h>
#include <pwd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/uio.h>
#include "config.h"

/* fill the hid with from hostname */
void gethid(char *hid, char *tty)
{
    int fd;
    char *tp;
    struct utmp data;

    gethostname(hid, MAXHOSTNAMELEN);
    hid[MAXHOSTNAMELEN] = '\0';
    tp = strrchr(tty, '/') + 1;
    if (tp && strlen(tp) == 5)
    {
    fd = open(_PATH_UTMP, O_RDONLY);
    if (fd < 0)
        syslog(LOG_ERR, "%s: %m", _PATH_UTMP);
    else
    {
        while (read(fd, &data, sizeof(data)) == sizeof(data))
        if (strcmp(data.ut_line, tp) == 0)
        {
            if (data.ut_host[0]) {
#if MAXHOSTNAMELEN < UT_HOSTSIZE
            strncpy(hid, data.ut_host, MAXHOSTNAMELEN);
            hid[MAXHOSTNAMELEN] = '\0';
#else
            strncpy(hid, data.ut_host, UT_HOSTSIZE);
            hid[UT_HOSTSIZE] = '\0';
#endif
            }
            break;
        }
        close(fd);
    }
    }
}

/*
   get system load averages 
   return 0 if success; otherwise, return -1.
 */
int getload(double load[3])
{
    int rtv = -1;
#if defined(linux)
    FILE *fp;

    fp = fopen(LOAD_FILE, "r");
    if (fp)
    {
    if (fscanf(fp, "%lf %lf %lf", &load[0], &load[1], &load[2]) == 3)
        rtv = 0;
    fclose(fp);
    }
#elif defined(__FreeBSD__)
    if (getloadavg(load, 3) == 3)
    rtv = 0;
#endif
    return rtv;
}

/*
   show ban file
   if filename exist, print it out, sleep 1 second, and return 0;
   otherwise, return -1.
 */
int showbanfile(char *filename)
{
    FILE *fp;
    char buf[256];

    fp = fopen(filename, "r");
    if (fp)
    {
    while (fgets(buf, sizeof(buf), fp))
        fputs(buf, stdout);
    printf("\n============================="
           "=============================\n");
    fclose(fp);
    sleep(1);
    }
    return fp ? 0 : -1;
}

int main(void)
{
    int uid, rtv = 0;
    char *tty, ttybuf[32], hid[MAXHOSTNAMELEN + 1];

    openlog("bbsrf", LOG_PID | LOG_PERROR, LOG_USER);
    chdir(BBSHOME);
    uid = getuid();

    while (1)
    {
    if (!showbanfile(BAN_FILE))
    {
        rtv = 1;
        break;
    }
    else if (uid != BBSUID)
    {
        syslog(LOG_ERR, "UID DOES NOT MATCH");
        rtv = -1;
        break;
    }
    else if (!getpwuid(uid))
    {
        syslog(LOG_ERR, "YOU DONT EXIST");
        rtv = -1;
        break;
    }
    else
    {
        tty = ttyname(0);
        if (tty)
        {
        strcpy(ttybuf, tty);
        gethid(hid, ttybuf);
        }
        else
        {
        strcpy(ttybuf, "notty");
        strcpy(hid, "unknown");
        }
        execl(BBSPROG, "mbbsd", hid, ttybuf, NULL);
        syslog(LOG_ERR, "execl(): %m");
        rtv = -1;
    }
    break;
    }
    return rtv;
}