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 #define RAW_MAX_BACKLOG 4096
  15
  16 static Socket s = NULL;
  17 static int raw_bufsize;
  18
  19 static void raw_size(void);
  20
  21 static void c_write(char *buf, int len)
  22 {
  23     int backlog = from_backend(0, buf, len);
  24     sk_set_frozen(s, backlog > RAW_MAX_BACKLOG);
  25 }
  26
  27 static int raw_closing(Plug plug, char *error_msg, int error_code,
  28                        int calling_back)
  29 {
  30     if (s) {
  31         sk_close(s);
  32         s = NULL;
  33     }
  34     if (error_msg) {
  35         /* A socket error has occurred. */
  36         connection_fatal(error_msg);
  37     }                                  /* Otherwise, the remote side closed the connection normally. */
  38     return 0;
  39 }
  40
  41 static int raw_receive(Plug plug, int urgent, char *data, int len)
  42 {
  43     c_write(data, len);
  44     return 1;
  45 }
  46
  47 /*
  48  * Called to set up the raw connection.
  49  *
  50  * Returns an error message, or NULL on success.
  51  *
  52  * Also places the canonical host name into `realhost'. It must be
  53  * freed by the caller.
  54  */
  55 static char *raw_init(char *host, int port, char **realhost)
  56 {
  57     static struct plug_function_table fn_table = {
  58         raw_closing,
  59         raw_receive
  60     }, *fn_table_ptr = &fn_table;
  61
  62     SockAddr addr;
  63     char *err;
  64
  65     /*
  66      * Try to find host.
  67      */
  68     addr = sk_namelookup(host, realhost);
  69     if ((err = sk_addr_error(addr)))
  70         return err;
  71
  72     if (port < 0)
  73         port = 23;                     /* default telnet port */
  74
  75     /*
  76      * Open socket.
  77      */
  78     s = sk_new(addr, port, 0, 1, &fn_table_ptr);
  79     if ((err = sk_socket_error(s)))
  80         return err;
  81
  82     sk_addr_free(addr);
  83
  84     return NULL;
  85 }
  86
  87 /*
  88  * Called to send data down the raw connection.
  89  */
  90 static int raw_send(char *buf, int len)
  91 {
  92     if (s == NULL)
  93         return 0;
  94
  95     raw_bufsize = sk_write(s, buf, len);
  96
  97     return raw_bufsize;
  98 }
  99
 100 /*
 101  * Called to query the current socket sendability status.
 102  */
 103 static int raw_sendbuffer(void)
 104 {
 105     return raw_bufsize;
 106 }
 107
 108 /*
 109  * Called to set the size of the window
 110  */
 111 static void raw_size(void)
 112 {
 113     /* Do nothing! */
 114     return;
 115 }
 116
 117 /*
 118  * Send raw special codes.
 119  */
 120 static void raw_special(Telnet_Special code)
 121 {
 122     /* Do nothing! */
 123     return;
 124 }
 125
 126 static Socket raw_socket(void)
 127 {
 128     return s;
 129 }
 130
 131 static int raw_sendok(void)
 132 {
 133     return 1;
 134 }
 135
 136 static void raw_unthrottle(int backlog)
 137 {
 138     sk_set_frozen(s, backlog > RAW_MAX_BACKLOG);
 139 }
 140
 141 static int raw_ldisc(int option)
 142 {
 143     if (option == LD_EDIT || option == LD_ECHO)
 144         return 1;
 145     return 0;
 146 }
 147
 148 Backend raw_backend = {
 149     raw_init,
 150     raw_send,
 151     raw_sendbuffer,
 152     raw_size,
 153     raw_special,
 154     raw_socket,
 155     raw_sendok,
 156     raw_ldisc,
 157     raw_unthrottle,
 158     1
 159 };