/* * winproxy.c: Windows implementation of platform_new_connection(), * supporting an OpenSSH-like proxy command via the winhandl.c * mechanism. */ #include <stdio.h> #include <assert.h> #define DEFINE_PLUG_METHOD_MACROS #include "tree234.h" #include "putty.h" #include "network.h" #include "proxy.h" typedef struct Socket_localproxy_tag *Local_Proxy_Socket; struct Socket_localproxy_tag { const struct socket_function_table *fn; /* the above variable absolutely *must* be the first in this structure */ HANDLE to_cmd_H, from_cmd_H; struct handle *to_cmd_h, *from_cmd_h; char *error; Plug plug; void *privptr; }; int localproxy_gotdata(struct handle *h, void *data, int len) { Local_Proxy_Socket ps = (Local_Proxy_Socket) handle_get_privdata(h); if (len < 0) { return plug_closing(ps->plug, "Read error from local proxy command", 0, 0); } else if (len == 0) { return plug_closing(ps->plug, NULL, 0, 0); } else { return plug_receive(ps->plug, 0, data, len); } } void localproxy_sentdata(struct handle *h, int new_backlog) { Local_Proxy_Socket ps = (Local_Proxy_Socket) handle_get_privdata(h); plug_sent(ps->plug, new_backlog); } static Plug sk_localproxy_plug (Socket s, Plug p) { Local_Proxy_Socket ps = (Local_Proxy_Socket) s; Plug ret = ps->plug; if (p) ps->plug = p; return ret; } static void sk_localproxy_close (Socket s) { Local_Proxy_Socket ps = (Local_Proxy_Socket) s; handle_free(ps->to_cmd_h); handle_free(ps->from_cmd_h); CloseHandle(ps->to_cmd_H); CloseHandle(ps->from_cmd_H); sfree(ps); } static int sk_localproxy_write (Socket s, const char *data, int len) { Local_Proxy_Socket ps = (Local_Proxy_Socket) s; return handle_write(ps->to_cmd_h, data, len); } static int sk_localproxy_write_oob(Socket s, const char *data, int len) { /* * oob data is treated as inband; nasty, but nothing really * better we can do */ return sk_localproxy_write(s, data, len); } static void sk_localproxy_flush(Socket s) { /* Local_Proxy_Socket ps = (Local_Proxy_Socket) s; */ /* do nothing */ } static void sk_localproxy_set_private_ptr(Socket s, void *ptr) { Local_Proxy_Socket ps = (Local_Proxy_Socket) s; ps->privptr = ptr; } static void *sk_localproxy_get_private_ptr(Socket s) { Local_Proxy_Socket ps = (Local_Proxy_Socket) s; return ps->privptr; } static void sk_localproxy_set_frozen(Socket s, int is_frozen) { Local_Proxy_Socket ps = (Local_Proxy_Socket) s; /* * FIXME */ } static const char *sk_localproxy_socket_error(Socket s) { Local_Proxy_Socket ps = (Local_Proxy_Socket) s; return ps->error; } Socket platform_new_connection(SockAddr addr, char *hostname, int port, int privport, int oobinline, int nodelay, int keepalive, Plug plug, const Config *cfg) { char *cmd; static const struct socket_function_table socket_fn_table = { sk_localproxy_plug, sk_localproxy_close, sk_localproxy_write, sk_localproxy_write_oob, sk_localproxy_flush, sk_localproxy_set_private_ptr, sk_localproxy_get_private_ptr, sk_localproxy_set_frozen, sk_localproxy_socket_error }; Local_Proxy_Socket ret; HANDLE us_to_cmd, us_from_cmd, cmd_to_us, cmd_from_us; SECURITY_ATTRIBUTES sa; STARTUPINFO si; PROCESS_INFORMATION pi; if (cfg->proxy_type != PROXY_CMD) return NULL; cmd = format_telnet_command(addr, port, cfg); { char *msg = dupprintf("Starting local proxy command: %s", cmd); /* We're allowed to pass NULL here, because we're part of the Windows * front end so we know logevent doesn't expect any data. */ logevent(NULL, msg); sfree(msg); } ret = snew(struct Socket_localproxy_tag); ret->fn = &socket_fn_table; ret->plug = plug; ret->error = NULL; /* * Create the pipes to the proxy command, and spawn the proxy * command process. */ sa.nLength = sizeof(sa); sa.lpSecurityDescriptor = NULL; /* default */ sa.bInheritHandle = TRUE; if (!CreatePipe(&us_from_cmd, &cmd_to_us, &sa, 0)) { ret->error = dupprintf("Unable to create pipes for proxy command"); return (Socket)ret; } if (!CreatePipe(&cmd_from_us, &us_to_cmd, &sa, 0)) { CloseHandle(us_from_cmd); CloseHandle(cmd_to_us); ret->error = dupprintf("Unable to create pipes for proxy command"); return (Socket)ret; } SetHandleInformation(us_to_cmd, HANDLE_FLAG_INHERIT, 0); SetHandleInformation(us_from_cmd, HANDLE_FLAG_INHERIT, 0); si.cb = sizeof(si); si.lpReserved = NULL; si.lpDesktop = NULL; si.lpTitle = NULL; si.dwFlags = STARTF_USESTDHANDLES; si.cbReserved2 = 0; si.lpReserved2 = NULL; si.hStdInput = cmd_from_us; si.hStdOutput = cmd_to_us; si.hStdError = NULL; CreateProcess(NULL, cmd, NULL, NULL, TRUE, CREATE_NO_WINDOW | NORMAL_PRIORITY_CLASS, NULL, NULL, &si, &pi); sfree(cmd); CloseHandle(cmd_from_us); CloseHandle(cmd_to_us); ret->to_cmd_H = us_to_cmd; ret->from_cmd_H = us_from_cmd; ret->from_cmd_h = handle_input_new(ret->from_cmd_H, localproxy_gotdata, ret, 0); ret->to_cmd_h = handle_output_new(ret->to_cmd_H, localproxy_sentdata, ret, 0); /* We are responsible for this and don't need it any more */ sk_addr_free(addr); return (Socket) ret; }