git.distorted.org.uk Git - u/mdw/putty/blob - rlogin.c

   1 #include <windows.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4
   5 #include "putty.h"
   6
   7 #ifndef FALSE
   8 #define FALSE 0
   9 #endif
  10 #ifndef TRUE
  11 #define TRUE 1
  12 #endif
  13
  14 static Socket s = NULL;
  15
  16 static void rlogin_size(void);
  17
  18 static int sb_opt, sb_len;
  19 static char *sb_buf = NULL;
  20 static int sb_size = 0;
  21 #define SB_DELTA 1024
  22
  23 static void c_write (char *buf, int len) {
  24     from_backend(0, buf, len);
  25 }
  26
  27 static int rlogin_receive (Socket skt, int urgent, char *data, int len) {
  28     if (urgent==3) {
  29         /* A socket error has occurred. */
  30         sk_close(s);
  31         s = NULL;
  32         connection_fatal(data);
  33         return 0;
  34     } else if (!len) {
  35         /* Connection has closed. */
  36         sk_close(s);
  37         s = NULL;
  38         return 0;
  39     }
  40     if (urgent == 2) {
  41         char c;
  42
  43         c = *data++; len--;
  44         if (c == '\x80')
  45             rlogin_size();
  46         /*
  47          * We should flush everything (aka Telnet SYNCH) if we see
  48          * 0x02, and we should turn off and on _local_ flow control
  49          * on 0x10 and 0x20 respectively. I'm not convinced it's
  50          * worth it...
  51          */
  52     }
  53     c_write(data, len);
  54     return 1;
  55 }
  56
  57 /*
  58  * Called to set up the rlogin connection.
  59  *
  60  * Returns an error message, or NULL on success.
  61  *
  62  * Also places the canonical host name into `realhost'.
  63  */
  64 static char *rlogin_init (char *host, int port, char **realhost) {
  65     SockAddr addr;
  66     char *err;
  67
  68     /*
  69      * Try to find host.
  70      */
  71     addr = sk_namelookup(host, realhost);
  72     if ( (err = sk_addr_error(addr)) )
  73         return err;
  74
  75     if (port < 0)
  76         port = 513;                    /* default rlogin port */
  77
  78     /*
  79      * Open socket.
  80      */
  81     s = sk_new(addr, port, 1, rlogin_receive);
  82     if ( (err = sk_socket_error(s)) )
  83         return err;
  84
  85     sk_addr_free(addr);
  86
  87     /*
  88      * Send local username, remote username, terminal/speed
  89      */
  90
  91     {
  92         char z = 0;
  93         char *p;
  94         sk_write(s, &z, 1);
  95         sk_write(s, cfg.localusername, strlen(cfg.localusername));
  96         sk_write(s, &z, 1);
  97         sk_write(s, cfg.username, strlen(cfg.username));
  98         sk_write(s, &z, 1);
  99         sk_write(s, cfg.termtype, strlen(cfg.termtype));
 100         sk_write(s, "/", 1);
 101         for(p = cfg.termspeed; isdigit(*p); p++);
 102         sk_write(s, cfg.termspeed, p - cfg.termspeed);
 103         sk_write(s, &z, 1);
 104     }
 105
 106     return NULL;
 107 }
 108
 109 /*
 110  * Called to send data down the rlogin connection.
 111  */
 112 static void rlogin_send (char *buf, int len) {
 113
 114     if (s == NULL)
 115         return;
 116
 117     sk_write(s, buf, len);
 118 }
 119
 120 /*
 121  * Called to set the size of the window
 122  */
 123 static void rlogin_size(void) {
 124     char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
 125
 126     b[6] = cols >> 8; b[7] = cols & 0xFF;
 127     b[4] = rows >> 8; b[5] = rows & 0xFF;
 128     sk_write(s, b, 12);
 129     return;
 130 }
 131
 132 /*
 133  * Send rlogin special codes.
 134  */
 135 static void rlogin_special (Telnet_Special code) {
 136     /* Do nothing! */
 137     return;
 138 }
 139
 140 static Socket rlogin_socket(void) { return s; }
 141
 142 static int rlogin_sendok(void) { return 1; }
 143
 144 static int rlogin_ldisc(int option) {
 145     return 0;
 146 }
 147
 148 Backend rlogin_backend = {
 149     rlogin_init,
 150     rlogin_send,
 151     rlogin_size,
 152     rlogin_special,
 153     rlogin_socket,
 154     rlogin_sendok,
 155     rlogin_ldisc,
 156     1
 157 };