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     } else {
  53         /*
  54          * Main rlogin protocol. This is really simple: the first
  55          * byte is expected to be NULL and is ignored, and the rest
  56          * is printed.
  57          */
  58         static int firstbyte = 1;
  59         if (firstbyte) {
  60             if (data[0] == '\0') {
  61                 data++;
  62                 len--;
  63             }
  64             firstbyte = 0;
  65         }
  66         c_write(data, len);
  67     }
  68     return 1;
  69 }
  70
  71 /*
  72  * Called to set up the rlogin connection.
  73  *
  74  * Returns an error message, or NULL on success.
  75  *
  76  * Also places the canonical host name into `realhost'.
  77  */
  78 static char *rlogin_init (char *host, int port, char **realhost) {
  79     SockAddr addr;
  80     char *err;
  81
  82     /*
  83      * Try to find host.
  84      */
  85     addr = sk_namelookup(host, realhost);
  86     if ( (err = sk_addr_error(addr)) )
  87         return err;
  88
  89     if (port < 0)
  90         port = 513;                    /* default rlogin port */
  91
  92     /*
  93      * Open socket.
  94      */
  95     s = sk_new(addr, port, 1, rlogin_receive);
  96     if ( (err = sk_socket_error(s)) )
  97         return err;
  98
  99     sk_addr_free(addr);
 100
 101     /*
 102      * Send local username, remote username, terminal/speed
 103      */
 104
 105     {
 106         char z = 0;
 107         char *p;
 108         sk_write(s, &z, 1);
 109         sk_write(s, cfg.localusername, strlen(cfg.localusername));
 110         sk_write(s, &z, 1);
 111         sk_write(s, cfg.username, strlen(cfg.username));
 112         sk_write(s, &z, 1);
 113         sk_write(s, cfg.termtype, strlen(cfg.termtype));
 114         sk_write(s, "/", 1);
 115         for(p = cfg.termspeed; isdigit(*p); p++);
 116         sk_write(s, cfg.termspeed, p - cfg.termspeed);
 117         sk_write(s, &z, 1);
 118     }
 119
 120     return NULL;
 121 }
 122
 123 /*
 124  * Called to send data down the rlogin connection.
 125  */
 126 static void rlogin_send (char *buf, int len) {
 127
 128     if (s == NULL)
 129         return;
 130
 131     sk_write(s, buf, len);
 132 }
 133
 134 /*
 135  * Called to set the size of the window
 136  */
 137 static void rlogin_size(void) {
 138     char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
 139
 140     b[6] = cols >> 8; b[7] = cols & 0xFF;
 141     b[4] = rows >> 8; b[5] = rows & 0xFF;
 142     sk_write(s, b, 12);
 143     return;
 144 }
 145
 146 /*
 147  * Send rlogin special codes.
 148  */
 149 static void rlogin_special (Telnet_Special code) {
 150     /* Do nothing! */
 151     return;
 152 }
 153
 154 static Socket rlogin_socket(void) { return s; }
 155
 156 static int rlogin_sendok(void) { return 1; }
 157
 158 static int rlogin_ldisc(int option) {
 159     return 0;
 160 }
 161
 162 Backend rlogin_backend = {
 163     rlogin_init,
 164     rlogin_send,
 165     rlogin_size,
 166     rlogin_special,
 167     rlogin_socket,
 168     rlogin_sendok,
 169     rlogin_ldisc,
 170     1
 171 };