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

   1 #include <windows.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <winsock.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 = INVALID_SOCKET;
  16
  17 static void raw_size(void);
  18
  19 static int sb_opt, sb_len;
  20 static char *sb_buf = NULL;
  21 static int sb_size = 0;
  22 #define SB_DELTA 1024
  23
  24 static void try_write (void) {
  25     while (outbuf_head != outbuf_reap) {
  26         int end = (outbuf_reap < outbuf_head ? outbuf_head : OUTBUF_SIZE);
  27         int len = end - outbuf_reap;
  28         int ret;
  29
  30         ret = send (s, outbuf+outbuf_reap, len, 0);
  31         if (ret > 0)
  32             outbuf_reap = (outbuf_reap + ret) & OUTBUF_MASK;
  33         if (ret < len)
  34             return;
  35     }
  36 }
  37
  38 static void s_write (void *buf, int len) {
  39     unsigned char *p = buf;
  40     while (len--) {
  41         int new_head = (outbuf_head + 1) & OUTBUF_MASK;
  42         if (new_head != outbuf_reap) {
  43             outbuf[outbuf_head] = *p++;
  44             outbuf_head = new_head;
  45         }
  46     }
  47     try_write();
  48 }
  49
  50 static void c_write (char *buf, int len) {
  51     while (len--)
  52         c_write1(*buf++);
  53 }
  54
  55 /*
  56  * Called to set up the raw connection. Will arrange for
  57  * WM_NETEVENT messages to be passed to the specified window, whose
  58  * window procedure should then call raw_msg().
  59  *
  60  * Returns an error message, or NULL on success.
  61  *
  62  * Also places the canonical host name into `realhost'.
  63  */
  64 static char *raw_init (HWND hwnd, char *host, int port, char **realhost) {
  65     SOCKADDR_IN addr;
  66     struct hostent *h;
  67     unsigned long a;
  68
  69     /*
  70      * Try to find host.
  71      */
  72     if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) {
  73         if ( (h = gethostbyname(host)) == NULL)
  74             switch (WSAGetLastError()) {
  75               case WSAENETDOWN: return "Network is down";
  76               case WSAHOST_NOT_FOUND: case WSANO_DATA:
  77                 return "Host does not exist";
  78               case WSATRY_AGAIN: return "Host not found";
  79               default: return "gethostbyname: unknown error";
  80             }
  81         memcpy (&a, h->h_addr, sizeof(a));
  82         *realhost = h->h_name;
  83     } else
  84         *realhost = host;
  85     a = ntohl(a);
  86
  87     if (port < 0)
  88         port = 23;                     /* default telnet port */
  89
  90     /*
  91      * Open socket.
  92      */
  93     s = socket(AF_INET, SOCK_STREAM, 0);
  94     if (s == INVALID_SOCKET)
  95         switch (WSAGetLastError()) {
  96           case WSAENETDOWN: return "Network is down";
  97           case WSAEAFNOSUPPORT: return "TCP/IP support not present";
  98           default: return "socket(): unknown error";
  99         }
 100
 101     /*
 102      * Bind to local address.
 103      */
 104     addr.sin_family = AF_INET;
 105     addr.sin_addr.s_addr = htonl(INADDR_ANY);
 106     addr.sin_port = htons(0);
 107     if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
 108         switch (WSAGetLastError()) {
 109           case WSAENETDOWN: return "Network is down";
 110           default: return "bind(): unknown error";
 111         }
 112
 113     /*
 114      * Connect to remote address.
 115      */
 116     addr.sin_addr.s_addr = htonl(a);
 117     addr.sin_port = htons((short)port);
 118     if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
 119         switch (WSAGetLastError()) {
 120           case WSAENETDOWN: return "Network is down";
 121           case WSAECONNREFUSED: return "Connection refused";
 122           case WSAENETUNREACH: return "Network is unreachable";
 123           case WSAEHOSTUNREACH: return "No route to host";
 124           default: return "connect(): unknown error";
 125         }
 126
 127     if (hwnd && WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ |
 128                         FD_WRITE | FD_OOB | FD_CLOSE) == SOCKET_ERROR)
 129         switch (WSAGetLastError()) {
 130           case WSAENETDOWN: return "Network is down";
 131           default: return "WSAAsyncSelect(): unknown error";
 132         }
 133
 134     return NULL;
 135 }
 136
 137 /*
 138  * Process a WM_NETEVENT message. Will return 0 if the connection
 139  * has closed, or <0 for a socket error.
 140  */
 141 static int raw_msg (WPARAM wParam, LPARAM lParam) {
 142     int ret;
 143     char buf[256];
 144
 145     /*
 146      * Because reading less than the whole of the available pending
 147      * data can generate an FD_READ event, we need to allow for the
 148      * possibility that FD_READ may arrive with FD_CLOSE already in
 149      * the queue; so it's possible that we can get here even with s
 150      * invalid. If so, we return 1 and don't worry about it.
 151      */
 152     if (s == INVALID_SOCKET) {
 153         closesocket(s);
 154         s = INVALID_SOCKET;
 155         return 1;
 156     }
 157
 158     if (WSAGETSELECTERROR(lParam) != 0)
 159         return -WSAGETSELECTERROR(lParam);
 160
 161     switch (WSAGETSELECTEVENT(lParam)) {
 162       case FD_READ:
 163       case FD_CLOSE:
 164         ret = recv(s, buf, sizeof(buf), 0);
 165         if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK)
 166             return 1;
 167         if (ret < 0) {                 /* any _other_ error */
 168             closesocket(s);
 169             s = INVALID_SOCKET;
 170             return -10000-WSAGetLastError();
 171         }
 172         if (ret == 0) {
 173             s = INVALID_SOCKET;
 174             return 0;
 175         }
 176         c_write( buf, ret );
 177         return 1;
 178       case FD_OOB:
 179         do {
 180             ret = recv(s, buf, sizeof(buf), 0);
 181             c_write( buf, ret );
 182         } while (ret > 0);
 183         do {
 184             ret = recv(s, buf, 1, MSG_OOB);
 185         } while (ret > 0);
 186         if (ret < 0 && WSAGetLastError() != WSAEWOULDBLOCK)
 187             return -30000-WSAGetLastError();
 188         return 1;
 189       case FD_WRITE:
 190         if (outbuf_head != outbuf_reap)
 191             try_write();
 192         return 1;
 193     }
 194     return 1;                          /* shouldn't happen, but WTF */
 195 }
 196
 197 /*
 198  * Called to send data down the raw connection.
 199  */
 200 static void raw_send (char *buf, int len) {
 201
 202     if (s == INVALID_SOCKET)
 203         return;
 204
 205     s_write( buf, len );
 206 }
 207
 208 /*
 209  * Called to set the size of the window
 210  */
 211 static void raw_size(void) {
 212     /* Do nothing! */
 213     return;
 214 }
 215
 216 /*
 217  * Send raw special codes.
 218  */
 219 static void raw_special (Telnet_Special code) {
 220     /* Do nothing! */
 221     return;
 222 }
 223
 224 static SOCKET raw_socket(void) { return s; }
 225
 226 static int raw_sendok(void) { return 1; }
 227
 228 Backend raw_backend = {
 229     raw_init,
 230     raw_msg,
 231     raw_send,
 232     raw_size,
 233     raw_special,
 234     raw_socket,
 235     raw_sendok
 236 };