source: trunk/minix/commands/rlogind/setup.c@ 10

/*
setup.c
*/

#include <sys/types.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <net/netlib.h>
#include <net/gen/in.h>
#include <net/gen/inet.h>
#include <net/gen/tcp.h>
#include <net/gen/tcp_io.h>
#include <net/gen/netdb.h>
#include <net/gen/socket.h>
#include "rlogind.h"

static void getstr(char *buf, int cnt, char *errmsg);

void authenticate(void)
{
        int result;
        struct nwio_tcpconf tcpconf;
        struct hostent *hostent;
        char c;

        /* Let's lookup the hostname for the connection. */
        result= ioctl (0, NWIOGTCPCONF, &tcpconf);
        if (result<0)
        {
                fprintf(stderr, "%s: ioctl(NWIOTCPCONF): %s\r\n", 
                        prog_name, strerror(errno));
                exit(1);
        }
        hostent= gethostbyaddr((char *)&tcpconf.nwtc_remaddr,
                sizeof(tcpconf.nwtc_remaddr), AF_INET);
        if (hostent)
        {
                strncpy(hostname, hostent->h_name, sizeof(hostname)-1);
                hostname[sizeof(hostname)-1]= '\0';
        }
        else
        {
                strcpy(hostname, inet_ntoa(tcpconf.nwtc_remaddr));
        }

        authenticated = 0;

        getstr(&c, 1, "protocol violation");
        getstr(rusername, sizeof(rusername), "remuser too long");
        getstr(lusername, sizeof(lusername), "locuser too long");
        strcpy(term, "TERM=");
        getstr(term+5, sizeof(term)-5, "Terminal type too long");

#if DEBUG
        fprintf(stderr, "got lu= %s, ru= %s, te= %s\r\n", lusername, rusername,
                term);
#endif
        if (iruserok(tcpconf.nwtc_remaddr, 0, rusername, lusername) == 0)
                authenticated = 1;
}

static void getstr(char *buf, int cnt, char *errmsg)
{
        char c;

        errno= 0;
        do
        {
                if (read(0, &c, 1) != 1)
                        fatal(1, "read failed", errno);
                cnt--;
                if (cnt < 0)
                        fatal(1, errmsg, 0);
                *buf++= c;
        } while(c != 0);
}

void tcp_urg(int fd, int on)
{
        struct nwio_tcpopt tcpopt;

        tcpopt.nwto_flags= on ? (NWTO_BSD_URG | NWTO_SND_URG) : NWTO_SND_NOTURG;
        if (ioctl(1, NWIOSTCPOPT, &tcpopt) == -1)
        {
                fprintf(stderr, "rlogind: NWIOSTCPOPT failed: %s\r\n",
                        strerror(errno));
        }
}