| 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 | return (Socket)ret; |
| 184 | } |
| 185 | |
| 186 | if (!CreatePipe(&cmd_from_us, &us_to_cmd, &sa, 0)) { |
| 187 | CloseHandle(us_from_cmd); |
| 188 | CloseHandle(cmd_to_us); |
| 189 | ret->error = dupprintf("Unable to create pipes for proxy command"); |
| 190 | return (Socket)ret; |
| 191 | } |
| 192 | |
| 193 | SetHandleInformation(us_to_cmd, HANDLE_FLAG_INHERIT, 0); |
| 194 | SetHandleInformation(us_from_cmd, HANDLE_FLAG_INHERIT, 0); |
| 195 | |
| 196 | si.cb = sizeof(si); |
| 197 | si.lpReserved = NULL; |
| 198 | si.lpDesktop = NULL; |
| 199 | si.lpTitle = NULL; |
| 200 | si.dwFlags = STARTF_USESTDHANDLES; |
| 201 | si.cbReserved2 = 0; |
| 202 | si.lpReserved2 = NULL; |
| 203 | si.hStdInput = cmd_from_us; |
| 204 | si.hStdOutput = cmd_to_us; |
| 205 | si.hStdError = NULL; |
| 206 | CreateProcess(NULL, cmd, NULL, NULL, TRUE, |
| 207 | CREATE_NO_WINDOW | NORMAL_PRIORITY_CLASS, |
| 208 | NULL, NULL, &si, &pi); |
| 209 | CloseHandle(pi.hProcess); |
| 210 | CloseHandle(pi.hThread); |
| 211 | |
| 212 | sfree(cmd); |
| 213 | |
| 214 | CloseHandle(cmd_from_us); |
| 215 | CloseHandle(cmd_to_us); |
| 216 | |
| 217 | ret->to_cmd_H = us_to_cmd; |
| 218 | ret->from_cmd_H = us_from_cmd; |
| 219 | |
| 220 | ret->from_cmd_h = handle_input_new(ret->from_cmd_H, localproxy_gotdata, |
| 221 | ret, 0); |
| 222 | ret->to_cmd_h = handle_output_new(ret->to_cmd_H, localproxy_sentdata, |
| 223 | ret, 0); |
| 224 | |
| 225 | /* We are responsible for this and don't need it any more */ |
| 226 | sk_addr_free(addr); |
| 227 | |
| 228 | return (Socket) ret; |
| 229 | } |