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

   1 /*
   2  * winproxy.c: Windows implementation of platform_new_connection(),
   3  * supporting an OpenSSH-like proxy command via the winhandl.c
   4  * mechanism.
   5  */
   6
   7 #include <stdio.h>
   8 #include <assert.h>
   9
  10 #define DEFINE_PLUG_METHOD_MACROS
  11 #include "tree234.h"
  12 #include "putty.h"
  13 #include "network.h"
  14 #include "proxy.h"
  15
  16 typedef struct Socket_localproxy_tag *Local_Proxy_Socket;
  17
  18 struct Socket_localproxy_tag {
  19     const struct socket_function_table *fn;
  20     /* the above variable absolutely *must* be the first in this structure */
  21
  22     HANDLE to_cmd_H, from_cmd_H;
  23     struct handle *to_cmd_h, *from_cmd_h;
  24
  25     char *error;
  26
  27     Plug plug;
  28
  29     void *privptr;
  30 };
  31
  32 int localproxy_gotdata(struct handle *h, void *data, int len)
  33 {
  34     Local_Proxy_Socket ps = (Local_Proxy_Socket) handle_get_privdata(h);
  35
  36     if (len < 0) {
  37         return plug_closing(ps->plug, "Read error from local proxy command",
  38                             0, 0);
  39     } else if (len == 0) {
  40         return plug_closing(ps->plug, NULL, 0, 0);
  41     } else {
  42         return plug_receive(ps->plug, 0, data, len);
  43     }
  44 }
  45
  46 void localproxy_sentdata(struct handle *h, int new_backlog)
  47 {
  48     Local_Proxy_Socket ps = (Local_Proxy_Socket) handle_get_privdata(h);
  49
  50     plug_sent(ps->plug, new_backlog);
  51 }
  52
  53 static Plug sk_localproxy_plug (Socket s, Plug p)
  54 {
  55     Local_Proxy_Socket ps = (Local_Proxy_Socket) s;
  56     Plug ret = ps->plug;
  57     if (p)
  58         ps->plug = p;
  59     return ret;
  60 }
  61
  62 static void sk_localproxy_close (Socket s)
  63 {
  64     Local_Proxy_Socket ps = (Local_Proxy_Socket) s;
  65
  66     handle_free(ps->to_cmd_h);
  67     handle_free(ps->from_cmd_h);
  68     CloseHandle(ps->to_cmd_H);
  69     CloseHandle(ps->from_cmd_H);
  70
  71     sfree(ps);
  72 }
  73
  74 static int sk_localproxy_write (Socket s, const char *data, int len)
  75 {
  76     Local_Proxy_Socket ps = (Local_Proxy_Socket) s;
  77
  78     return handle_write(ps->to_cmd_h, data, len);
  79 }
  80
  81 static int sk_localproxy_write_oob(Socket s, const char *data, int len)
  82 {
  83     /*
  84      * oob data is treated as inband; nasty, but nothing really
  85      * better we can do
  86      */
  87     return sk_localproxy_write(s, data, len);
  88 }
  89
  90 static void sk_localproxy_write_eof(Socket s)
  91 {
  92     Local_Proxy_Socket ps = (Local_Proxy_Socket) s;
  93
  94     handle_write_eof(ps->to_cmd_h);
  95 }
  96
  97 static void sk_localproxy_flush(Socket s)
  98 {
  99     /* Local_Proxy_Socket ps = (Local_Proxy_Socket) s; */
 100     /* do nothing */
 101 }
 102
 103 static void sk_localproxy_set_private_ptr(Socket s, void *ptr)
 104 {
 105     Local_Proxy_Socket ps = (Local_Proxy_Socket) s;
 106     ps->privptr = ptr;
 107 }
 108
 109 static void *sk_localproxy_get_private_ptr(Socket s)
 110 {
 111     Local_Proxy_Socket ps = (Local_Proxy_Socket) s;
 112     return ps->privptr;
 113 }
 114
 115 static void sk_localproxy_set_frozen(Socket s, int is_frozen)
 116 {
 117     Local_Proxy_Socket ps = (Local_Proxy_Socket) s;
 118
 119     /*
 120      * FIXME
 121      */
 122 }
 123
 124 static const char *sk_localproxy_socket_error(Socket s)
 125 {
 126     Local_Proxy_Socket ps = (Local_Proxy_Socket) s;
 127     return ps->error;
 128 }
 129
 130 Socket platform_new_connection(SockAddr addr, char *hostname,
 131                                int port, int privport,
 132                                int oobinline, int nodelay, int keepalive,
 133                                Plug plug, Conf *conf)
 134 {
 135     char *cmd;
 136
 137     static const struct socket_function_table socket_fn_table = {
 138         sk_localproxy_plug,
 139         sk_localproxy_close,
 140         sk_localproxy_write,
 141         sk_localproxy_write_oob,
 142         sk_localproxy_write_eof,
 143         sk_localproxy_flush,
 144         sk_localproxy_set_private_ptr,
 145         sk_localproxy_get_private_ptr,
 146         sk_localproxy_set_frozen,
 147         sk_localproxy_socket_error
 148     };
 149
 150     Local_Proxy_Socket ret;
 151     HANDLE us_to_cmd, us_from_cmd, cmd_to_us, cmd_from_us;
 152     SECURITY_ATTRIBUTES sa;
 153     STARTUPINFO si;
 154     PROCESS_INFORMATION pi;
 155
 156     if (conf_get_int(conf, CONF_proxy_type) != PROXY_CMD)
 157         return NULL;
 158
 159     cmd = format_telnet_command(addr, port, conf);
 160
 161     {
 162         char *msg = dupprintf("Starting local proxy command: %s", cmd);
 163         /* We're allowed to pass NULL here, because we're part of the Windows
 164          * front end so we know logevent doesn't expect any data. */
 165         logevent(NULL, msg);
 166         sfree(msg);
 167     }
 168
 169     ret = snew(struct Socket_localproxy_tag);
 170     ret->fn = &socket_fn_table;
 171     ret->plug = plug;
 172     ret->error = NULL;
 173
 174     /*
 175      * Create the pipes to the proxy command, and spawn the proxy
 176      * command process.
 177      */
 178     sa.nLength = sizeof(sa);
 179     sa.lpSecurityDescriptor = NULL;    /* default */
 180     sa.bInheritHandle = TRUE;
 181     if (!CreatePipe(&us_from_cmd, &cmd_to_us, &sa, 0)) {
 182         ret->error = dupprintf("Unable to create pipes for proxy command");
 183         sfree(cmd);
 184         return (Socket)ret;
 185     }
 186
 187     if (!CreatePipe(&cmd_from_us, &us_to_cmd, &sa, 0)) {
 188         CloseHandle(us_from_cmd);
 189         CloseHandle(cmd_to_us);
 190         ret->error = dupprintf("Unable to create pipes for proxy command");
 191         sfree(cmd);
 192         return (Socket)ret;
 193     }
 194
 195     SetHandleInformation(us_to_cmd, HANDLE_FLAG_INHERIT, 0);
 196     SetHandleInformation(us_from_cmd, HANDLE_FLAG_INHERIT, 0);
 197
 198     si.cb = sizeof(si);
 199     si.lpReserved = NULL;
 200     si.lpDesktop = NULL;
 201     si.lpTitle = NULL;
 202     si.dwFlags = STARTF_USESTDHANDLES;
 203     si.cbReserved2 = 0;
 204     si.lpReserved2 = NULL;
 205     si.hStdInput = cmd_from_us;
 206     si.hStdOutput = cmd_to_us;
 207     si.hStdError = NULL;
 208     CreateProcess(NULL, cmd, NULL, NULL, TRUE,
 209                   CREATE_NO_WINDOW | NORMAL_PRIORITY_CLASS,
 210                   NULL, NULL, &si, &pi);
 211     CloseHandle(pi.hProcess);
 212     CloseHandle(pi.hThread);
 213
 214     sfree(cmd);
 215
 216     CloseHandle(cmd_from_us);
 217     CloseHandle(cmd_to_us);
 218
 219     ret->to_cmd_H = us_to_cmd;
 220     ret->from_cmd_H = us_from_cmd;
 221
 222     ret->from_cmd_h = handle_input_new(ret->from_cmd_H, localproxy_gotdata,
 223                                        ret, 0);
 224     ret->to_cmd_h = handle_output_new(ret->to_cmd_H, localproxy_sentdata,
 225                                       ret, 0);
 226
 227     /* We are responsible for this and don't need it any more */
 228     sk_addr_free(addr);
 229
 230     return (Socket) ret;
 231 }