commands/rlogind/setup.c

   1 /*
   2 setup.c
   3 */
   4
   5 #include <sys/types.h>
   6 #include <sys/ioctl.h>
   7 #include <errno.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12 #include <net/netlib.h>
  13 #include <net/gen/in.h>
  14 #include <net/gen/inet.h>
  15 #include <net/gen/tcp.h>
  16 #include <net/gen/tcp_io.h>
  17 #include <net/gen/netdb.h>
  18 #include <net/gen/socket.h>
  19 #include "rlogind.h"
  20
  21 static void getstr(char *buf, int cnt, char *errmsg);
  22
  23 void authenticate(void)
  24 {
  25         int result;
  26         struct nwio_tcpconf tcpconf;
  27         struct hostent *hostent;
  28         char c;
  29
  30         /* Let's lookup the hostname for the connection. */
  31         result= ioctl (0, NWIOGTCPCONF, &tcpconf);
  32         if (result<0)
  33         {
  34                 fprintf(stderr, "%s: ioctl(NWIOTCPCONF): %s\r\n",
  35                         prog_name, strerror(errno));
  36                 exit(1);
  37         }
  38         hostent= gethostbyaddr((char *)&tcpconf.nwtc_remaddr,
  39                 sizeof(tcpconf.nwtc_remaddr), AF_INET);
  40         if (hostent)
  41         {
  42                 strncpy(hostname, hostent->h_name, sizeof(hostname)-1);
  43                 hostname[sizeof(hostname)-1]= '\0';
  44         }
  45         else
  46         {
  47                 strcpy(hostname, inet_ntoa(tcpconf.nwtc_remaddr));
  48         }
  49
  50         authenticated = 0;
  51
  52         getstr(&c, 1, "protocol violation");
  53         getstr(rusername, sizeof(rusername), "remuser too long");
  54         getstr(lusername, sizeof(lusername), "locuser too long");
  55         strcpy(term, "TERM=");
  56         getstr(term+5, sizeof(term)-5, "Terminal type too long");
  57
  58 #if DEBUG
  59         fprintf(stderr, "got lu= %s, ru= %s, te= %s\r\n", lusername, rusername,
  60                 term);
  61 #endif
  62         if (iruserok(tcpconf.nwtc_remaddr, 0, rusername, lusername) == 0)
  63                 authenticated = 1;
  64 }
  65
  66 static void getstr(char *buf, int cnt, char *errmsg)
  67 {
  68         char c;
  69
  70         errno= 0;
  71         do
  72         {
  73                 if (read(0, &c, 1) != 1)
  74                         fatal(1, "read failed", errno);
  75                 cnt--;
  76                 if (cnt < 0)
  77                         fatal(1, errmsg, 0);
  78                 *buf++= c;
  79         } while(c != 0);
  80 }
  81
  82 void tcp_urg(int fd, int on)
  83 {
  84         struct nwio_tcpopt tcpopt;
  85
  86         tcpopt.nwto_flags= on ? (NWTO_BSD_URG | NWTO_SND_URG) : NWTO_SND_NOTURG;
  87         if (ioctl(1, NWIOSTCPOPT, &tcpopt) == -1)
  88         {
  89                 fprintf(stderr, "rlogind: NWIOSTCPOPT failed: %s\r\n",
  90                         strerror(errno));
  91         }
  92 }