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

   1 #include <windows.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <ctype.h>
   5
   6 #include "putty.h"
   7
   8 #ifndef FALSE
   9 #define FALSE 0
  10 #endif
  11 #ifndef TRUE
  12 #define TRUE 1
  13 #endif
  14
  15 static Socket s = NULL;
  16
  17 static void rlogin_size(void);
  18
  19 static void c_write(char *buf, int len)
  20 {
  21     from_backend(0, buf, len);
  22 }
  23
  24 static int rlogin_closing(Plug plug, char *error_msg, int error_code,
  25                           int calling_back)
  26 {
  27     if (s) {
  28         sk_close(s);
  29         s = NULL;
  30     }
  31     if (error_msg) {
  32         /* A socket error has occurred. */
  33         connection_fatal(error_msg);
  34     }                                  /* Otherwise, the remote side closed the connection normally. */
  35     return 0;
  36 }
  37
  38 static int rlogin_receive(Plug plug, int urgent, char *data, int len)
  39 {
  40     if (urgent == 2) {
  41         char c;
  42
  43         c = *data++;
  44         len--;
  45         if (c == '\x80')
  46             rlogin_size();
  47         /*
  48          * We should flush everything (aka Telnet SYNCH) if we see
  49          * 0x02, and we should turn off and on _local_ flow control
  50          * on 0x10 and 0x20 respectively. I'm not convinced it's
  51          * worth it...
  52          */
  53     } else {
  54         /*
  55          * Main rlogin protocol. This is really simple: the first
  56          * byte is expected to be NULL and is ignored, and the rest
  57          * is printed.
  58          */
  59         static int firstbyte = 1;
  60         if (firstbyte) {
  61             if (data[0] == '\0') {
  62                 data++;
  63                 len--;
  64             }
  65             firstbyte = 0;
  66         }
  67         c_write(data, len);
  68     }
  69     return 1;
  70 }
  71
  72 /*
  73  * Called to set up the rlogin connection.
  74  *
  75  * Returns an error message, or NULL on success.
  76  *
  77  * Also places the canonical host name into `realhost'. It must be
  78  * freed by the caller.
  79  */
  80 static char *rlogin_init(char *host, int port, char **realhost)
  81 {
  82     static struct plug_function_table fn_table = {
  83         rlogin_closing,
  84         rlogin_receive
  85     }, *fn_table_ptr = &fn_table;
  86
  87     SockAddr addr;
  88     char *err;
  89
  90     /*
  91      * Try to find host.
  92      */
  93     addr = sk_namelookup(host, realhost);
  94     if ((err = sk_addr_error(addr)))
  95         return err;
  96
  97     if (port < 0)
  98         port = 513;                    /* default rlogin port */
  99
 100     /*
 101      * Open socket.
 102      */
 103     s = sk_new(addr, port, 1, 0, &fn_table_ptr);
 104     if ((err = sk_socket_error(s)))
 105         return err;
 106
 107     sk_addr_free(addr);
 108
 109     /*
 110      * Send local username, remote username, terminal/speed
 111      */
 112
 113     {
 114         char z = 0;
 115         char *p;
 116         sk_write(s, &z, 1);
 117         sk_write(s, cfg.localusername, strlen(cfg.localusername));
 118         sk_write(s, &z, 1);
 119         sk_write(s, cfg.username, strlen(cfg.username));
 120         sk_write(s, &z, 1);
 121         sk_write(s, cfg.termtype, strlen(cfg.termtype));
 122         sk_write(s, "/", 1);
 123         for (p = cfg.termspeed; isdigit(*p); p++);
 124         sk_write(s, cfg.termspeed, p - cfg.termspeed);
 125         sk_write(s, &z, 1);
 126     }
 127
 128     return NULL;
 129 }
 130
 131 /*
 132  * Called to send data down the rlogin connection.
 133  */
 134 static void rlogin_send(char *buf, int len)
 135 {
 136
 137     if (s == NULL)
 138         return;
 139
 140     sk_write(s, buf, len);
 141 }
 142
 143 /*
 144  * Called to set the size of the window
 145  */
 146 static void rlogin_size(void)
 147 {
 148     char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };
 149
 150     b[6] = cols >> 8;
 151     b[7] = cols & 0xFF;
 152     b[4] = rows >> 8;
 153     b[5] = rows & 0xFF;
 154     sk_write(s, b, 12);
 155     return;
 156 }
 157
 158 /*
 159  * Send rlogin special codes.
 160  */
 161 static void rlogin_special(Telnet_Special code)
 162 {
 163     /* Do nothing! */
 164     return;
 165 }
 166
 167 static Socket rlogin_socket(void)
 168 {
 169     return s;
 170 }
 171
 172 static int rlogin_sendok(void)
 173 {
 174     return 1;
 175 }
 176
 177 static int rlogin_ldisc(int option)
 178 {
 179     return 0;
 180 }
 181
 182 Backend rlogin_backend = {
 183     rlogin_init,
 184     rlogin_send,
 185     rlogin_size,
 186     rlogin_special,
 187     rlogin_socket,
 188     rlogin_sendok,
 189     rlogin_ldisc,
 190     1
 191 };