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 <pwd.h>
#include <syslog.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/uio.h>
#include "config.h"

#ifdef Solaris
    #include <utmpx.h>
    #define U_FILE UTMPX_FILE
#else
    #include <utmp.h>
    #define U_FILE UTMP_FILE
#endif

#ifdef __FreeBSD__
    #define UTMP_FILE _PATH_UTMP
#endif

#ifndef Solaris
    #if MAXHOSTNAMELEN < UT_HOSTSIZE
    #define MAX_HOMENAME_LEN MAXHOSTNAMELEN
    #else
    #define MAX_HOMENAME_LEN UT_HOSTSIZE
    #endif
#else
    /* according to /usr/include/utmpx.h ... */
    #define MAX_HOMENAME_LEN 256
#endif

/* fill the hid with from hostname */
void gethid(char *hid, char *tty)
{
    char frombuf[100];

    if (getenv("SSH_CLIENT"))
    sscanf(getenv("SSH_CLIENT"), "%s", frombuf);
    else
    strcpy(frombuf, "127.0.0.1");

    if (strrchr(frombuf, ':'))
    strncpy(hid, strrchr(frombuf, ':') + 1, MAX_HOMENAME_LEN);
    else
    strncpy(hid, frombuf, MAX_HOMENAME_LEN);
}

/*
   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(10);
    }
    return fp ? 0 : -1;
}

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

#ifndef Solaris
    openlog("bbsrf", LOG_PID | LOG_PERROR, LOG_USER);
#else
    openlog("bbsrf", LOG_PID, LOG_USER);
#endif
    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");
        sleep(3); // prevent flooding
        rtv = -1;
    }
    break;
    }
    return rtv;
}