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