git.distorted.org.uk Git - u/mdw/putty/blob - raw.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 raw_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 raw_receive (Socket skt, int urgent, char *data, int len) {
  28     if (urgent==3) {
  29         /* A socket error has occurred. */
  30         s = NULL;
  31         connection_fatal(data);
  32         len = 0;
  33     }
  34     if (!len) {
  35         /* Connection has closed. */
  36         sk_close(s);
  37         s = NULL;
  38         return 0;
  39     }
  40     c_write(data, len);
  41     return 1;
  42 }
  43
  44 /*
  45  * Called to set up the raw connection.
  46  *
  47  * Returns an error message, or NULL on success.
  48  *
  49  * Also places the canonical host name into `realhost'.
  50  */
  51 static char *raw_init (char *host, int port, char **realhost) {
  52     SockAddr addr;
  53     char *err;
  54
  55     /*
  56      * Try to find host.
  57      */
  58     addr = sk_namelookup(host, realhost);
  59     if ( (err = sk_addr_error(addr)) )
  60         return err;
  61
  62     if (port < 0)
  63         port = 23;                     /* default telnet port */
  64
  65     /*
  66      * Open socket.
  67      */
  68     s = sk_new(addr, port, 0, raw_receive);
  69     if ( (err = sk_socket_error(s)) )
  70         return err;
  71
  72     sk_addr_free(addr);
  73
  74     return NULL;
  75 }
  76
  77 /*
  78  * Called to send data down the raw connection.
  79  */
  80 static void raw_send (char *buf, int len) {
  81
  82     if (s == NULL)
  83         return;
  84
  85     sk_write(s, buf, len);
  86 }
  87
  88 /*
  89  * Called to set the size of the window
  90  */
  91 static void raw_size(void) {
  92     /* Do nothing! */
  93     return;
  94 }
  95
  96 /*
  97  * Send raw special codes.
  98  */
  99 static void raw_special (Telnet_Special code) {
 100     /* Do nothing! */
 101     return;
 102 }
 103
 104 static Socket raw_socket(void) { return s; }
 105
 106 static int raw_sendok(void) { return 1; }
 107
 108 static int raw_ldisc(int option) {
 109     if (option == LD_EDIT || option == LD_ECHO)
 110         return 1;
 111     return 0;
 112 }
 113
 114 Backend raw_backend = {
 115     raw_init,
 116     raw_send,
 117     raw_size,
 118     raw_special,
 119     raw_socket,
 120     raw_sendok,
 121     raw_ldisc,
 122     1
 123 };