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