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 static void *frontend;
  19
  20 static void raw_size(int width, int height);
  21
  22 static void c_write(char *buf, int len)
  23 {
  24     int backlog = from_backend(frontend, 0, buf, len);
  25     sk_set_frozen(s, backlog > RAW_MAX_BACKLOG);
  26 }
  27
  28 static int raw_closing(Plug plug, char *error_msg, int error_code,
  29                        int calling_back)
  30 {
  31     if (s) {
  32         sk_close(s);
  33         s = NULL;
  34     }
  35     if (error_msg) {
  36         /* A socket error has occurred. */
  37         logevent(error_msg);
  38         connection_fatal("%s", error_msg);
  39     }                                  /* Otherwise, the remote side closed the connection normally. */
  40     return 0;
  41 }
  42
  43 static int raw_receive(Plug plug, int urgent, char *data, int len)
  44 {
  45     c_write(data, len);
  46     return 1;
  47 }
  48
  49 static void raw_sent(Plug plug, int bufsize)
  50 {
  51     raw_bufsize = bufsize;
  52 }
  53
  54 /*
  55  * Called to set up the raw connection.
  56  *
  57  * Returns an error message, or NULL on success.
  58  *
  59  * Also places the canonical host name into `realhost'. It must be
  60  * freed by the caller.
  61  */
  62 static char *raw_init(void *frontend_handle, char *host, int port,
  63                       char **realhost, int nodelay)
  64 {
  65     static struct plug_function_table fn_table = {
  66         raw_closing,
  67         raw_receive,
  68         raw_sent
  69     }, *fn_table_ptr = &fn_table;
  70
  71     SockAddr addr;
  72     char *err;
  73
  74     frontend = frontend_handle;
  75
  76     /*
  77      * Try to find host.
  78      */
  79     {
  80         char buf[200];
  81         sprintf(buf, "Looking up host \"%.170s\"", host);
  82         logevent(buf);
  83     }
  84     addr = sk_namelookup(host, realhost);
  85     if ((err = sk_addr_error(addr)))
  86         return err;
  87
  88     if (port < 0)
  89         port = 23;                     /* default telnet port */
  90
  91     /*
  92      * Open socket.
  93      */
  94     {
  95         char buf[200], addrbuf[100];
  96         sk_getaddr(addr, addrbuf, 100);
  97         sprintf(buf, "Connecting to %.100s port %d", addrbuf, port);
  98         logevent(buf);
  99     }
 100     s = new_connection(addr, *realhost, port, 0, 1, nodelay, &fn_table_ptr);
 101     if ((err = sk_socket_error(s)))
 102         return err;
 103
 104     sk_addr_free(addr);
 105
 106     return NULL;
 107 }
 108
 109 /*
 110  * Called to send data down the raw connection.
 111  */
 112 static int raw_send(char *buf, int len)
 113 {
 114     if (s == NULL)
 115         return 0;
 116
 117     raw_bufsize = sk_write(s, buf, len);
 118
 119     return raw_bufsize;
 120 }
 121
 122 /*
 123  * Called to query the current socket sendability status.
 124  */
 125 static int raw_sendbuffer(void)
 126 {
 127     return raw_bufsize;
 128 }
 129
 130 /*
 131  * Called to set the size of the window
 132  */
 133 static void raw_size(int width, int height)
 134 {
 135     /* Do nothing! */
 136     return;
 137 }
 138
 139 /*
 140  * Send raw special codes.
 141  */
 142 static void raw_special(Telnet_Special code)
 143 {
 144     /* Do nothing! */
 145     return;
 146 }
 147
 148 static Socket raw_socket(void)
 149 {
 150     return s;
 151 }
 152
 153 static int raw_sendok(void)
 154 {
 155     return 1;
 156 }
 157
 158 static void raw_unthrottle(int backlog)
 159 {
 160     sk_set_frozen(s, backlog > RAW_MAX_BACKLOG);
 161 }
 162
 163 static int raw_ldisc(int option)
 164 {
 165     if (option == LD_EDIT || option == LD_ECHO)
 166         return 1;
 167     return 0;
 168 }
 169
 170 static int raw_exitcode(void)
 171 {
 172     /* Exit codes are a meaningless concept in the Raw protocol */
 173     return 0;
 174 }
 175
 176 Backend raw_backend = {
 177     raw_init,
 178     raw_send,
 179     raw_sendbuffer,
 180     raw_size,
 181     raw_special,
 182     raw_socket,
 183     raw_exitcode,
 184     raw_sendok,
 185     raw_ldisc,
 186     raw_unthrottle,
 187     1
 188 };