mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-01-10 01:48:00 +00:00
650 lines
19 KiB
C
650 lines
19 KiB
C
/*
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* PLink - a Windows command-line (stdin/stdout) variant of PuTTY.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <stdarg.h>
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#define PUTTY_DO_GLOBALS /* actually _define_ globals */
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#include "putty.h"
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#include "storage.h"
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#include "tree234.h"
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#include "winsecur.h"
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#define WM_AGENT_CALLBACK (WM_APP + 4)
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struct agent_callback {
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void (*callback)(void *, void *, int);
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void *callback_ctx;
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void *data;
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int len;
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};
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void modalfatalbox(const char *p, ...)
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{
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va_list ap;
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fprintf(stderr, "FATAL ERROR: ");
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va_start(ap, p);
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vfprintf(stderr, p, ap);
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va_end(ap);
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fputc('\n', stderr);
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if (logctx) {
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log_free(logctx);
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logctx = NULL;
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}
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cleanup_exit(1);
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}
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void nonfatal(const char *p, ...)
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{
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va_list ap;
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fprintf(stderr, "ERROR: ");
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va_start(ap, p);
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vfprintf(stderr, p, ap);
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va_end(ap);
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fputc('\n', stderr);
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}
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void connection_fatal(Frontend *frontend, const char *p, ...)
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{
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va_list ap;
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fprintf(stderr, "FATAL ERROR: ");
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va_start(ap, p);
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vfprintf(stderr, p, ap);
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va_end(ap);
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fputc('\n', stderr);
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if (logctx) {
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log_free(logctx);
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logctx = NULL;
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}
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cleanup_exit(1);
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}
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void cmdline_error(const char *p, ...)
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{
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va_list ap;
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fprintf(stderr, "plink: ");
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va_start(ap, p);
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vfprintf(stderr, p, ap);
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va_end(ap);
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fputc('\n', stderr);
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exit(1);
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}
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HANDLE inhandle, outhandle, errhandle;
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struct handle *stdin_handle, *stdout_handle, *stderr_handle;
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DWORD orig_console_mode;
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WSAEVENT netevent;
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static Backend *backend;
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static Conf *conf;
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int term_ldisc(Terminal *term, int mode)
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{
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return FALSE;
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}
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void frontend_echoedit_update(Frontend *frontend, int echo, int edit)
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{
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/* Update stdin read mode to reflect changes in line discipline. */
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DWORD mode;
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mode = ENABLE_PROCESSED_INPUT;
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if (echo)
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mode = mode | ENABLE_ECHO_INPUT;
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else
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mode = mode & ~ENABLE_ECHO_INPUT;
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if (edit)
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mode = mode | ENABLE_LINE_INPUT;
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else
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mode = mode & ~ENABLE_LINE_INPUT;
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SetConsoleMode(inhandle, mode);
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}
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char *get_ttymode(Frontend *frontend, const char *mode) { return NULL; }
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int from_backend(Frontend *frontend, int is_stderr,
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const void *data, int len)
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{
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if (is_stderr) {
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handle_write(stderr_handle, data, len);
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} else {
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handle_write(stdout_handle, data, len);
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}
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return handle_backlog(stdout_handle) + handle_backlog(stderr_handle);
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}
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int from_backend_eof(Frontend *frontend)
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{
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handle_write_eof(stdout_handle);
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return FALSE; /* do not respond to incoming EOF with outgoing */
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}
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int get_userpass_input(prompts_t *p, bufchain *input)
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{
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int ret;
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ret = cmdline_get_passwd_input(p);
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if (ret == -1)
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ret = console_get_userpass_input(p);
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return ret;
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}
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static DWORD main_thread_id;
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void agent_schedule_callback(void (*callback)(void *, void *, int),
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void *callback_ctx, void *data, int len)
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{
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struct agent_callback *c = snew(struct agent_callback);
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c->callback = callback;
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c->callback_ctx = callback_ctx;
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c->data = data;
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c->len = len;
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PostThreadMessage(main_thread_id, WM_AGENT_CALLBACK, 0, (LPARAM)c);
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}
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/*
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* Short description of parameters.
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*/
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static void usage(void)
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{
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printf("Plink: command-line connection utility\n");
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printf("%s\n", ver);
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printf("Usage: plink [options] [user@]host [command]\n");
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printf(" (\"host\" can also be a PuTTY saved session name)\n");
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printf("Options:\n");
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printf(" -V print version information and exit\n");
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printf(" -pgpfp print PGP key fingerprints and exit\n");
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printf(" -v show verbose messages\n");
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printf(" -load sessname Load settings from saved session\n");
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printf(" -ssh -telnet -rlogin -raw -serial\n");
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printf(" force use of a particular protocol\n");
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printf(" -P port connect to specified port\n");
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printf(" -l user connect with specified username\n");
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printf(" -batch disable all interactive prompts\n");
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printf(" -proxycmd command\n");
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printf(" use 'command' as local proxy\n");
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printf(" -sercfg configuration-string (e.g. 19200,8,n,1,X)\n");
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printf(" Specify the serial configuration (serial only)\n");
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printf("The following options only apply to SSH connections:\n");
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printf(" -pw passw login with specified password\n");
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printf(" -D [listen-IP:]listen-port\n");
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printf(" Dynamic SOCKS-based port forwarding\n");
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printf(" -L [listen-IP:]listen-port:host:port\n");
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printf(" Forward local port to remote address\n");
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printf(" -R [listen-IP:]listen-port:host:port\n");
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printf(" Forward remote port to local address\n");
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printf(" -X -x enable / disable X11 forwarding\n");
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printf(" -A -a enable / disable agent forwarding\n");
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printf(" -t -T enable / disable pty allocation\n");
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printf(" -1 -2 force use of particular protocol version\n");
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printf(" -4 -6 force use of IPv4 or IPv6\n");
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printf(" -C enable compression\n");
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printf(" -i key private key file for user authentication\n");
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printf(" -noagent disable use of Pageant\n");
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printf(" -agent enable use of Pageant\n");
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printf(" -noshare disable use of connection sharing\n");
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printf(" -share enable use of connection sharing\n");
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printf(" -hostkey aa:bb:cc:...\n");
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printf(" manually specify a host key (may be repeated)\n");
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printf(" -m file read remote command(s) from file\n");
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printf(" -s remote command is an SSH subsystem (SSH-2 only)\n");
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printf(" -N don't start a shell/command (SSH-2 only)\n");
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printf(" -nc host:port\n");
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printf(" open tunnel in place of session (SSH-2 only)\n");
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printf(" -sshlog file\n");
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printf(" -sshrawlog file\n");
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printf(" log protocol details to a file\n");
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printf(" -shareexists\n");
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printf(" test whether a connection-sharing upstream exists\n");
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exit(1);
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}
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static void version(void)
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{
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char *buildinfo_text = buildinfo("\n");
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printf("plink: %s\n%s\n", ver, buildinfo_text);
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sfree(buildinfo_text);
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exit(0);
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}
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char *do_select(SOCKET skt, int startup)
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{
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int events;
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if (startup) {
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events = (FD_CONNECT | FD_READ | FD_WRITE |
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FD_OOB | FD_CLOSE | FD_ACCEPT);
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} else {
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events = 0;
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}
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if (p_WSAEventSelect(skt, netevent, events) == SOCKET_ERROR) {
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switch (p_WSAGetLastError()) {
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case WSAENETDOWN:
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return "Network is down";
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default:
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return "WSAEventSelect(): unknown error";
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}
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}
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return NULL;
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}
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int stdin_gotdata(struct handle *h, void *data, int len)
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{
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if (len < 0) {
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/*
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* Special case: report read error.
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*/
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char buf[4096];
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FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, -len, 0,
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buf, lenof(buf), NULL);
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buf[lenof(buf)-1] = '\0';
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if (buf[strlen(buf)-1] == '\n')
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buf[strlen(buf)-1] = '\0';
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fprintf(stderr, "Unable to read from standard input: %s\n", buf);
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cleanup_exit(0);
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}
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noise_ultralight(len);
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if (backend_connected(backend)) {
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if (len > 0) {
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return backend_send(backend, data, len);
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} else {
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backend_special(backend, SS_EOF, 0);
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return 0;
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}
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} else
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return 0;
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}
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void stdouterr_sent(struct handle *h, int new_backlog)
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{
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if (new_backlog < 0) {
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/*
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* Special case: report write error.
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*/
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char buf[4096];
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FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, -new_backlog, 0,
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buf, lenof(buf), NULL);
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buf[lenof(buf)-1] = '\0';
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if (buf[strlen(buf)-1] == '\n')
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buf[strlen(buf)-1] = '\0';
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fprintf(stderr, "Unable to write to standard %s: %s\n",
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(h == stdout_handle ? "output" : "error"), buf);
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cleanup_exit(0);
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}
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if (backend_connected(backend)) {
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backend_unthrottle(backend, (handle_backlog(stdout_handle) +
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handle_backlog(stderr_handle)));
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}
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}
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const int share_can_be_downstream = TRUE;
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const int share_can_be_upstream = TRUE;
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int main(int argc, char **argv)
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{
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int sending;
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SOCKET *sklist;
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int skcount, sksize;
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int exitcode;
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int errors;
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int use_subsystem = 0;
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int just_test_share_exists = FALSE;
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unsigned long now, next, then;
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const struct BackendVtable *vt;
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dll_hijacking_protection();
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sklist = NULL;
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skcount = sksize = 0;
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/*
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* Initialise port and protocol to sensible defaults. (These
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* will be overridden by more or less anything.)
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*/
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default_protocol = PROT_SSH;
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default_port = 22;
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flags = 0;
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cmdline_tooltype |=
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(TOOLTYPE_HOST_ARG |
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TOOLTYPE_HOST_ARG_CAN_BE_SESSION |
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TOOLTYPE_HOST_ARG_PROTOCOL_PREFIX |
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TOOLTYPE_HOST_ARG_FROM_LAUNCHABLE_LOAD);
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/*
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* Process the command line.
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*/
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conf = conf_new();
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do_defaults(NULL, conf);
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loaded_session = FALSE;
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default_protocol = conf_get_int(conf, CONF_protocol);
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default_port = conf_get_int(conf, CONF_port);
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errors = 0;
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{
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/*
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* Override the default protocol if PLINK_PROTOCOL is set.
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*/
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char *p = getenv("PLINK_PROTOCOL");
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if (p) {
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const struct BackendVtable *vt = backend_vt_from_name(p);
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if (vt) {
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default_protocol = vt->protocol;
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default_port = vt->default_port;
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conf_set_int(conf, CONF_protocol, default_protocol);
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conf_set_int(conf, CONF_port, default_port);
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}
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}
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}
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while (--argc) {
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char *p = *++argv;
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int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
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1, conf);
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if (ret == -2) {
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fprintf(stderr,
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"plink: option \"%s\" requires an argument\n", p);
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errors = 1;
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} else if (ret == 2) {
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--argc, ++argv;
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} else if (ret == 1) {
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continue;
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} else if (!strcmp(p, "-batch")) {
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console_batch_mode = 1;
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} else if (!strcmp(p, "-s")) {
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/* Save status to write to conf later. */
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use_subsystem = 1;
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} else if (!strcmp(p, "-V") || !strcmp(p, "--version")) {
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version();
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} else if (!strcmp(p, "--help")) {
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usage();
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} else if (!strcmp(p, "-pgpfp")) {
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pgp_fingerprints();
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exit(1);
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} else if (!strcmp(p, "-shareexists")) {
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just_test_share_exists = TRUE;
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} else if (*p != '-') {
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char *command;
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int cmdlen, cmdsize;
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cmdlen = cmdsize = 0;
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command = NULL;
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while (argc) {
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while (*p) {
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if (cmdlen >= cmdsize) {
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cmdsize = cmdlen + 512;
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command = sresize(command, cmdsize, char);
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}
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command[cmdlen++]=*p++;
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}
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if (cmdlen >= cmdsize) {
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cmdsize = cmdlen + 512;
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command = sresize(command, cmdsize, char);
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}
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command[cmdlen++]=' '; /* always add trailing space */
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if (--argc) p = *++argv;
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}
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if (cmdlen) command[--cmdlen]='\0';
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/* change trailing blank to NUL */
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conf_set_str(conf, CONF_remote_cmd, command);
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conf_set_str(conf, CONF_remote_cmd2, "");
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conf_set_int(conf, CONF_nopty, TRUE); /* command => no tty */
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break; /* done with cmdline */
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} else {
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fprintf(stderr, "plink: unknown option \"%s\"\n", p);
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errors = 1;
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}
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}
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if (errors)
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return 1;
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if (!cmdline_host_ok(conf)) {
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usage();
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}
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prepare_session(conf);
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/*
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* Perform command-line overrides on session configuration.
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*/
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cmdline_run_saved(conf);
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/*
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* Apply subsystem status.
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*/
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if (use_subsystem)
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conf_set_int(conf, CONF_ssh_subsys, TRUE);
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if (!*conf_get_str(conf, CONF_remote_cmd) &&
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!*conf_get_str(conf, CONF_remote_cmd2) &&
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!*conf_get_str(conf, CONF_ssh_nc_host))
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flags |= FLAG_INTERACTIVE;
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/*
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* Select protocol. This is farmed out into a table in a
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* separate file to enable an ssh-free variant.
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*/
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vt = backend_vt_from_proto(conf_get_int(conf, CONF_protocol));
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if (vt == NULL) {
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fprintf(stderr,
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"Internal fault: Unsupported protocol found\n");
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return 1;
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}
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sk_init();
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if (p_WSAEventSelect == NULL) {
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fprintf(stderr, "Plink requires WinSock 2\n");
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return 1;
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}
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/*
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* Plink doesn't provide any way to add forwardings after the
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* connection is set up, so if there are none now, we can safely set
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* the "simple" flag.
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*/
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if (conf_get_int(conf, CONF_protocol) == PROT_SSH &&
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!conf_get_int(conf, CONF_x11_forward) &&
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!conf_get_int(conf, CONF_agentfwd) &&
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!conf_get_str_nthstrkey(conf, CONF_portfwd, 0))
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conf_set_int(conf, CONF_ssh_simple, TRUE);
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logctx = log_init(NULL, conf);
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console_provide_logctx(logctx);
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if (just_test_share_exists) {
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if (!vt->test_for_upstream) {
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fprintf(stderr, "Connection sharing not supported for connection "
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"type '%s'\n", vt->name);
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return 1;
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}
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if (vt->test_for_upstream(conf_get_str(conf, CONF_host),
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conf_get_int(conf, CONF_port), conf))
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return 0;
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else
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return 1;
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}
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if (restricted_acl) {
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logevent(NULL, "Running with restricted process ACL");
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}
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/*
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* Start up the connection.
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*/
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netevent = CreateEvent(NULL, FALSE, FALSE, NULL);
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{
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const char *error;
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char *realhost;
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/* nodelay is only useful if stdin is a character device (console) */
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int nodelay = conf_get_int(conf, CONF_tcp_nodelay) &&
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(GetFileType(GetStdHandle(STD_INPUT_HANDLE)) == FILE_TYPE_CHAR);
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error = backend_init(vt, NULL, &backend, conf,
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conf_get_str(conf, CONF_host),
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conf_get_int(conf, CONF_port),
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&realhost, nodelay,
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conf_get_int(conf, CONF_tcp_keepalives));
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if (error) {
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fprintf(stderr, "Unable to open connection:\n%s", error);
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return 1;
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}
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backend_provide_logctx(backend, logctx);
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sfree(realhost);
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}
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inhandle = GetStdHandle(STD_INPUT_HANDLE);
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outhandle = GetStdHandle(STD_OUTPUT_HANDLE);
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errhandle = GetStdHandle(STD_ERROR_HANDLE);
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/*
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* Turn off ECHO and LINE input modes. We don't care if this
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* call fails, because we know we aren't necessarily running in
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* a console.
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*/
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GetConsoleMode(inhandle, &orig_console_mode);
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SetConsoleMode(inhandle, ENABLE_PROCESSED_INPUT);
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/*
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* Pass the output handles to the handle-handling subsystem.
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* (The input one we leave until we're through the
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* authentication process.)
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*/
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stdout_handle = handle_output_new(outhandle, stdouterr_sent, NULL, 0);
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stderr_handle = handle_output_new(errhandle, stdouterr_sent, NULL, 0);
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main_thread_id = GetCurrentThreadId();
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sending = FALSE;
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now = GETTICKCOUNT();
|
|
|
|
while (1) {
|
|
int nhandles;
|
|
HANDLE *handles;
|
|
int n;
|
|
DWORD ticks;
|
|
|
|
if (!sending && backend_sendok(backend)) {
|
|
stdin_handle = handle_input_new(inhandle, stdin_gotdata, NULL,
|
|
0);
|
|
sending = TRUE;
|
|
}
|
|
|
|
if (toplevel_callback_pending()) {
|
|
ticks = 0;
|
|
next = now;
|
|
} else if (run_timers(now, &next)) {
|
|
then = now;
|
|
now = GETTICKCOUNT();
|
|
if (now - then > next - then)
|
|
ticks = 0;
|
|
else
|
|
ticks = next - now;
|
|
} else {
|
|
ticks = INFINITE;
|
|
/* no need to initialise next here because we can never
|
|
* get WAIT_TIMEOUT */
|
|
}
|
|
|
|
handles = handle_get_events(&nhandles);
|
|
handles = sresize(handles, nhandles+1, HANDLE);
|
|
handles[nhandles] = netevent;
|
|
n = MsgWaitForMultipleObjects(nhandles+1, handles, FALSE, ticks,
|
|
QS_POSTMESSAGE);
|
|
if ((unsigned)(n - WAIT_OBJECT_0) < (unsigned)nhandles) {
|
|
handle_got_event(handles[n - WAIT_OBJECT_0]);
|
|
} else if (n == WAIT_OBJECT_0 + nhandles) {
|
|
WSANETWORKEVENTS things;
|
|
SOCKET socket;
|
|
extern SOCKET first_socket(int *), next_socket(int *);
|
|
int i, socketstate;
|
|
|
|
/*
|
|
* We must not call select_result() for any socket
|
|
* until we have finished enumerating within the tree.
|
|
* This is because select_result() may close the socket
|
|
* and modify the tree.
|
|
*/
|
|
/* Count the active sockets. */
|
|
i = 0;
|
|
for (socket = first_socket(&socketstate);
|
|
socket != INVALID_SOCKET;
|
|
socket = next_socket(&socketstate)) i++;
|
|
|
|
/* Expand the buffer if necessary. */
|
|
if (i > sksize) {
|
|
sksize = i + 16;
|
|
sklist = sresize(sklist, sksize, SOCKET);
|
|
}
|
|
|
|
/* Retrieve the sockets into sklist. */
|
|
skcount = 0;
|
|
for (socket = first_socket(&socketstate);
|
|
socket != INVALID_SOCKET;
|
|
socket = next_socket(&socketstate)) {
|
|
sklist[skcount++] = socket;
|
|
}
|
|
|
|
/* Now we're done enumerating; go through the list. */
|
|
for (i = 0; i < skcount; i++) {
|
|
WPARAM wp;
|
|
socket = sklist[i];
|
|
wp = (WPARAM) socket;
|
|
if (!p_WSAEnumNetworkEvents(socket, NULL, &things)) {
|
|
static const struct { int bit, mask; } eventtypes[] = {
|
|
{FD_CONNECT_BIT, FD_CONNECT},
|
|
{FD_READ_BIT, FD_READ},
|
|
{FD_CLOSE_BIT, FD_CLOSE},
|
|
{FD_OOB_BIT, FD_OOB},
|
|
{FD_WRITE_BIT, FD_WRITE},
|
|
{FD_ACCEPT_BIT, FD_ACCEPT},
|
|
};
|
|
int e;
|
|
|
|
noise_ultralight(socket);
|
|
noise_ultralight(things.lNetworkEvents);
|
|
|
|
for (e = 0; e < lenof(eventtypes); e++)
|
|
if (things.lNetworkEvents & eventtypes[e].mask) {
|
|
LPARAM lp;
|
|
int err = things.iErrorCode[eventtypes[e].bit];
|
|
lp = WSAMAKESELECTREPLY(eventtypes[e].mask, err);
|
|
select_result(wp, lp);
|
|
}
|
|
}
|
|
}
|
|
} else if (n == WAIT_OBJECT_0 + nhandles + 1) {
|
|
MSG msg;
|
|
while (PeekMessage(&msg, INVALID_HANDLE_VALUE,
|
|
WM_AGENT_CALLBACK, WM_AGENT_CALLBACK,
|
|
PM_REMOVE)) {
|
|
struct agent_callback *c = (struct agent_callback *)msg.lParam;
|
|
c->callback(c->callback_ctx, c->data, c->len);
|
|
sfree(c);
|
|
}
|
|
}
|
|
|
|
run_toplevel_callbacks();
|
|
|
|
if (n == WAIT_TIMEOUT) {
|
|
now = next;
|
|
} else {
|
|
now = GETTICKCOUNT();
|
|
}
|
|
|
|
sfree(handles);
|
|
|
|
if (sending)
|
|
handle_unthrottle(stdin_handle, backend_sendbuffer(backend));
|
|
|
|
if (!backend_connected(backend) &&
|
|
handle_backlog(stdout_handle) + handle_backlog(stderr_handle) == 0)
|
|
break; /* we closed the connection */
|
|
}
|
|
exitcode = backend_exitcode(backend);
|
|
if (exitcode < 0) {
|
|
fprintf(stderr, "Remote process exit code unavailable\n");
|
|
exitcode = 1; /* this is an error condition */
|
|
}
|
|
cleanup_exit(exitcode);
|
|
return 0; /* placate compiler warning */
|
|
}
|