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         sk_close(s);
  31         s = NULL;
  32         connection_fatal(data);
  33         len = 0;
  34         return 0;
  35     } else if (!len) {
  36         /* Connection has closed. */
  37         sk_close(s);
  38         s = NULL;
  39         return 0;
  40     }
  41     c_write(data, len);
  42     return 1;
  43 }
  44
  45 /*
  46  * Called to set up the raw connection.
  47  *
  48  * Returns an error message, or NULL on success.
  49  *
  50  * Also places the canonical host name into `realhost'.
  51  */
  52 static char *raw_init (char *host, int port, char **realhost) {
  53     SockAddr addr;
  54     char *err;
  55
  56     /*
  57      * Try to find host.
  58      */
  59     addr = sk_namelookup(host, realhost);
  60     if ( (err = sk_addr_error(addr)) )
  61         return err;
  62
  63     if (port < 0)
  64         port = 23;                     /* default telnet port */
  65
  66     /*
  67      * Open socket.
  68      */
  69     s = sk_new(addr, port, 0, 1, raw_receive);
  70     if ( (err = sk_socket_error(s)) )
  71         return err;
  72
  73     sk_addr_free(addr);
  74
  75     return NULL;
  76 }
  77
  78 /*
  79  * Called to send data down the raw connection.
  80  */
  81 static void raw_send (char *buf, int len) {
  82
  83     if (s == NULL)
  84         return;
  85
  86     sk_write(s, buf, len);
  87 }
  88
  89 /*
  90  * Called to set the size of the window
  91  */
  92 static void raw_size(void) {
  93     /* Do nothing! */
  94     return;
  95 }
  96
  97 /*
  98  * Send raw special codes.
  99  */
 100 static void raw_special (Telnet_Special code) {
 101     /* Do nothing! */
 102     return;
 103 }
 104
 105 static Socket raw_socket(void) { return s; }
 106
 107 static int raw_sendok(void) { return 1; }
 108
 109 static int raw_ldisc(int option) {
 110     if (option == LD_EDIT || option == LD_ECHO)
 111         return 1;
 112     return 0;
 113 }
 114
 115 Backend raw_backend = {
 116     raw_init,
 117     raw_send,
 118     raw_size,
 119     raw_special,
 120     raw_socket,
 121     raw_sendok,
 122     raw_ldisc,
 123     1
 124 };