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