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