minix/commands/rlogind/setup.c

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2005-04-21 16:53:53 +02:00
/*
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));
}
}