зеркало из https://github.com/github/putty.git
733 строки
17 KiB
C
733 строки
17 KiB
C
/*
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* PLink - a 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 <errno.h>
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#include <assert.h>
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#include <stdarg.h>
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#include <signal.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <pwd.h>
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#include <sys/ioctl.h>
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/* More helpful version of the FD_SET macro, to also handle maxfd. */
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#define FD_SET_MAX(fd, max, set) do { \
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FD_SET(fd, &set); \
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if (max < fd + 1) max = fd + 1; \
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} while (0)
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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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#define MAX_STDIN_BACKLOG 4096
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void fatalbox(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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cleanup_exit(1);
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}
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void modalfatalbox(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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cleanup_exit(1);
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}
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void connection_fatal(void *frontend, 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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cleanup_exit(1);
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}
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void cmdline_error(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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struct termios orig_termios;
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static Backend *back;
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static void *backhandle;
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static Config cfg;
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/*
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* Default settings that are specific to pterm.
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*/
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char *platform_default_s(const char *name)
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{
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if (!strcmp(name, "X11Display"))
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return getenv("DISPLAY");
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if (!strcmp(name, "TermType"))
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return getenv("TERM");
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if (!strcmp(name, "UserName")) {
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/*
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* Remote login username will default to the local username.
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*/
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struct passwd *p;
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uid_t uid = getuid();
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char *user, *ret = NULL;
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/*
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* First, find who we think we are using getlogin. If this
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* agrees with our uid, we'll go along with it. This should
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* allow sharing of uids between several login names whilst
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* coping correctly with people who have su'ed.
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*/
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user = getlogin();
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setpwent();
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if (user)
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p = getpwnam(user);
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else
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p = NULL;
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if (p && p->pw_uid == uid) {
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/*
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* The result of getlogin() really does correspond to
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* our uid. Fine.
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*/
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ret = user;
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} else {
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/*
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* If that didn't work, for whatever reason, we'll do
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* the simpler version: look up our uid in the password
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* file and map it straight to a name.
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*/
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p = getpwuid(uid);
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ret = p->pw_name;
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}
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endpwent();
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return ret;
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}
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return NULL;
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}
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int platform_default_i(const char *name, int def)
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{
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if (!strcmp(name, "TermWidth") ||
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!strcmp(name, "TermHeight")) {
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struct winsize size;
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if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
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return (!strcmp(name, "TermWidth") ? size.ws_col : size.ws_row);
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}
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return def;
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}
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FontSpec platform_default_fontspec(const char *name)
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{
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FontSpec ret;
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*ret.name = '\0';
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return ret;
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}
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Filename platform_default_filename(const char *name)
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{
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Filename ret;
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if (!strcmp(name, "LogFileName"))
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strcpy(ret.path, "putty.log");
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else
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*ret.path = '\0';
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return ret;
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}
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char *x_get_default(const char *key)
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{
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return NULL; /* this is a stub */
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}
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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 ldisc_update(void *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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struct termios mode;
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mode = orig_termios;
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if (echo)
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mode.c_lflag |= ECHO;
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else
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mode.c_lflag &= ~ECHO;
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if (edit)
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mode.c_lflag |= ISIG | ICANON;
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else
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mode.c_lflag &= ~(ISIG | ICANON);
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tcsetattr(0, TCSANOW, &mode);
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}
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void cleanup_termios(void)
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{
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tcsetattr(0, TCSANOW, &orig_termios);
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}
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bufchain stdout_data, stderr_data;
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void try_output(int is_stderr)
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{
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bufchain *chain = (is_stderr ? &stderr_data : &stdout_data);
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int fd = (is_stderr ? 2 : 1);
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void *senddata;
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int sendlen, ret;
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if (bufchain_size(chain) == 0)
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return;
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bufchain_prefix(chain, &senddata, &sendlen);
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ret = write(fd, senddata, sendlen);
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if (ret > 0)
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bufchain_consume(chain, ret);
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else if (ret < 0) {
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perror(is_stderr ? "stderr: write" : "stdout: write");
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exit(1);
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}
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}
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int from_backend(void *frontend_handle, int is_stderr,
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const char *data, int len)
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{
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int osize, esize;
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assert(len > 0);
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if (is_stderr) {
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bufchain_add(&stderr_data, data, len);
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try_output(1);
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} else {
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bufchain_add(&stdout_data, data, len);
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try_output(0);
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}
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osize = bufchain_size(&stdout_data);
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esize = bufchain_size(&stderr_data);
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return osize + esize;
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}
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int signalpipe[2];
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void sigwinch(int signum)
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{
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write(signalpipe[1], "x", 1);
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}
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/*
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* In Plink our selects are synchronous, so these functions are
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* empty stubs.
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*/
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int uxsel_input_add(int fd, int rwx) { return 0; }
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void uxsel_input_remove(int id) { }
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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("PuTTY Link: 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 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\n");
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printf(" force use of a particular protocol (default SSH)\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(" -m file read remote command(s) from file\n");
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printf(" -batch disable all interactive prompts\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-port Dynamic SOCKS-based port forwarding\n");
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printf(" -L listen-port:host:port Forward local port to "
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"remote address\n");
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printf(" -R listen-port:host:port Forward remote port to"
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" 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(" -C enable compression\n");
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printf(" -i key private key file for authentication\n");
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int sending;
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int portnumber = -1;
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int *fdlist;
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int fd;
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int i, fdcount, fdsize, fdstate;
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int connopen;
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int exitcode;
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int errors;
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void *ldisc;
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ssh_get_line = console_get_line;
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fdlist = NULL;
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fdcount = fdsize = 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 = FLAG_STDERR;
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/*
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* Process the command line.
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*/
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do_defaults(NULL, &cfg);
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default_protocol = cfg.protocol;
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default_port = cfg.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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int i;
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if (p) {
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for (i = 0; backends[i].backend != NULL; i++) {
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if (!strcmp(backends[i].name, p)) {
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default_protocol = cfg.protocol = backends[i].protocol;
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default_port = cfg.port =
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backends[i].backend->default_port;
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break;
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}
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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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if (*p == '-') {
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int ret = cmdline_process_param(p, (argc > 1 ? argv[1] : NULL),
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1, &cfg);
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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, "-o")) {
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if (argc <= 1) {
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fprintf(stderr,
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"plink: option \"-o\" requires an argument\n");
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errors = 1;
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} else {
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--argc;
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provide_xrm_string(*++argv);
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}
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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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} else if (*p) {
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if (!*cfg.host) {
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char *q = p;
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do_defaults(NULL, &cfg);
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/*
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* If the hostname starts with "telnet:", set the
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* protocol to Telnet and process the string as a
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* Telnet URL.
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*/
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if (!strncmp(q, "telnet:", 7)) {
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char c;
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q += 7;
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if (q[0] == '/' && q[1] == '/')
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q += 2;
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cfg.protocol = PROT_TELNET;
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p = q;
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while (*p && *p != ':' && *p != '/')
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p++;
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c = *p;
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if (*p)
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*p++ = '\0';
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if (c == ':')
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cfg.port = atoi(p);
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else
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cfg.port = -1;
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strncpy(cfg.host, q, sizeof(cfg.host) - 1);
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cfg.host[sizeof(cfg.host) - 1] = '\0';
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} else {
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char *r;
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/*
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* Before we process the [user@]host string, we
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* first check for the presence of a protocol
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* prefix (a protocol name followed by ",").
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*/
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r = strchr(p, ',');
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if (r) {
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int i, j;
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for (i = 0; backends[i].backend != NULL; i++) {
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j = strlen(backends[i].name);
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if (j == r - p &&
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!memcmp(backends[i].name, p, j)) {
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default_protocol = cfg.protocol =
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backends[i].protocol;
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portnumber =
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backends[i].backend->default_port;
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p = r + 1;
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break;
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}
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}
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}
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/*
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* Three cases. Either (a) there's a nonzero
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* length string followed by an @, in which
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* case that's user and the remainder is host.
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* Or (b) there's only one string, not counting
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* a potential initial @, and it exists in the
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* saved-sessions database. Or (c) only one
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* string and it _doesn't_ exist in the
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* database.
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*/
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r = strrchr(p, '@');
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if (r == p)
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p++, r = NULL; /* discount initial @ */
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if (r == NULL) {
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/*
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* One string.
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*/
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Config cfg2;
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do_defaults(p, &cfg2);
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if (cfg2.host[0] == '\0') {
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/* No settings for this host; use defaults */
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strncpy(cfg.host, p, sizeof(cfg.host) - 1);
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cfg.host[sizeof(cfg.host) - 1] = '\0';
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cfg.port = default_port;
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} else {
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cfg = cfg2;
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cfg.remote_cmd_ptr = cfg.remote_cmd;
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}
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} else {
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*r++ = '\0';
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strncpy(cfg.username, p, sizeof(cfg.username) - 1);
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cfg.username[sizeof(cfg.username) - 1] = '\0';
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strncpy(cfg.host, r, sizeof(cfg.host) - 1);
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cfg.host[sizeof(cfg.host) - 1] = '\0';
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cfg.port = default_port;
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}
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}
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} else {
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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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cfg.remote_cmd_ptr = command;
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cfg.remote_cmd_ptr2 = NULL;
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cfg.nopty = TRUE; /* command => no terminal */
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break; /* done with cmdline */
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}
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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 (!*cfg.host) {
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usage();
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}
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/*
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* Trim leading whitespace off the hostname if it's there.
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*/
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{
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int space = strspn(cfg.host, " \t");
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memmove(cfg.host, cfg.host+space, 1+strlen(cfg.host)-space);
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}
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/* See if host is of the form user@host */
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if (cfg.host[0] != '\0') {
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char *atsign = strchr(cfg.host, '@');
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/* Make sure we're not overflowing the user field */
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if (atsign) {
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if (atsign - cfg.host < sizeof cfg.username) {
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strncpy(cfg.username, cfg.host, atsign - cfg.host);
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cfg.username[atsign - cfg.host] = '\0';
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}
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memmove(cfg.host, atsign + 1, 1 + strlen(atsign + 1));
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}
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}
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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(&cfg);
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/*
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* Trim a colon suffix off the hostname if it's there.
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*/
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cfg.host[strcspn(cfg.host, ":")] = '\0';
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/*
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* Remove any remaining whitespace from the hostname.
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*/
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{
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int p1 = 0, p2 = 0;
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while (cfg.host[p2] != '\0') {
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if (cfg.host[p2] != ' ' && cfg.host[p2] != '\t') {
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cfg.host[p1] = cfg.host[p2];
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p1++;
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}
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p2++;
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}
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cfg.host[p1] = '\0';
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}
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if (!*cfg.remote_cmd_ptr)
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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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{
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int i;
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back = NULL;
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for (i = 0; backends[i].backend != NULL; i++)
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if (backends[i].protocol == cfg.protocol) {
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back = backends[i].backend;
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break;
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}
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if (back == 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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}
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/*
|
|
* Select port.
|
|
*/
|
|
if (portnumber != -1)
|
|
cfg.port = portnumber;
|
|
|
|
/*
|
|
* Set up the pipe we'll use to tell us about SIGWINCH.
|
|
*/
|
|
if (pipe(signalpipe) < 0) {
|
|
perror("pipe");
|
|
exit(1);
|
|
}
|
|
putty_signal(SIGWINCH, sigwinch);
|
|
|
|
sk_init();
|
|
uxsel_init();
|
|
|
|
/*
|
|
* Start up the connection.
|
|
*/
|
|
logctx = log_init(NULL, &cfg);
|
|
{
|
|
char *error;
|
|
char *realhost;
|
|
/* nodelay is only useful if stdin is a terminal device */
|
|
int nodelay = cfg.tcp_nodelay && isatty(0);
|
|
|
|
error = back->init(NULL, &backhandle, &cfg, cfg.host, cfg.port,
|
|
&realhost, nodelay);
|
|
if (error) {
|
|
fprintf(stderr, "Unable to open connection:\n%s\n", error);
|
|
return 1;
|
|
}
|
|
back->provide_logctx(backhandle, logctx);
|
|
ldisc = ldisc_create(&cfg, NULL, back, backhandle, NULL);
|
|
sfree(realhost);
|
|
}
|
|
connopen = 1;
|
|
|
|
/*
|
|
* Set up the initial console mode. We don't care if this call
|
|
* fails, because we know we aren't necessarily running in a
|
|
* console.
|
|
*/
|
|
tcgetattr(0, &orig_termios);
|
|
atexit(cleanup_termios);
|
|
ldisc_update(NULL, 1, 1);
|
|
sending = FALSE;
|
|
|
|
while (1) {
|
|
fd_set rset, wset, xset;
|
|
int maxfd;
|
|
int rwx;
|
|
int ret;
|
|
|
|
FD_ZERO(&rset);
|
|
FD_ZERO(&wset);
|
|
FD_ZERO(&xset);
|
|
maxfd = 0;
|
|
|
|
FD_SET_MAX(signalpipe[0], maxfd, rset);
|
|
|
|
if (connopen && !sending &&
|
|
back->socket(backhandle) != NULL &&
|
|
back->sendok(backhandle) &&
|
|
back->sendbuffer(backhandle) < MAX_STDIN_BACKLOG) {
|
|
/* If we're OK to send, then try to read from stdin. */
|
|
FD_SET_MAX(0, maxfd, rset);
|
|
}
|
|
|
|
if (bufchain_size(&stdout_data) > 0) {
|
|
/* If we have data for stdout, try to write to stdout. */
|
|
FD_SET_MAX(1, maxfd, wset);
|
|
}
|
|
|
|
if (bufchain_size(&stderr_data) > 0) {
|
|
/* If we have data for stderr, try to write to stderr. */
|
|
FD_SET_MAX(2, maxfd, wset);
|
|
}
|
|
|
|
/* Count the currently active fds. */
|
|
i = 0;
|
|
for (fd = first_fd(&fdstate, &rwx); fd >= 0;
|
|
fd = next_fd(&fdstate, &rwx)) i++;
|
|
|
|
/* Expand the fdlist buffer if necessary. */
|
|
if (i > fdsize) {
|
|
fdsize = i + 16;
|
|
fdlist = sresize(fdlist, fdsize, int);
|
|
}
|
|
|
|
/*
|
|
* Add all currently open fds to the select sets, and store
|
|
* them in fdlist as well.
|
|
*/
|
|
fdcount = 0;
|
|
for (fd = first_fd(&fdstate, &rwx); fd >= 0;
|
|
fd = next_fd(&fdstate, &rwx)) {
|
|
fdlist[fdcount++] = fd;
|
|
if (rwx & 1)
|
|
FD_SET_MAX(fd, maxfd, rset);
|
|
if (rwx & 2)
|
|
FD_SET_MAX(fd, maxfd, wset);
|
|
if (rwx & 4)
|
|
FD_SET_MAX(fd, maxfd, xset);
|
|
}
|
|
|
|
do {
|
|
ret = select(maxfd, &rset, &wset, &xset, NULL);
|
|
} while (ret < 0 && errno == EINTR);
|
|
|
|
if (ret < 0) {
|
|
perror("select");
|
|
exit(1);
|
|
}
|
|
|
|
for (i = 0; i < fdcount; i++) {
|
|
fd = fdlist[i];
|
|
/*
|
|
* We must process exceptional notifications before
|
|
* ordinary readability ones, or we may go straight
|
|
* past the urgent marker.
|
|
*/
|
|
if (FD_ISSET(fd, &xset))
|
|
select_result(fd, 4);
|
|
if (FD_ISSET(fd, &rset))
|
|
select_result(fd, 1);
|
|
if (FD_ISSET(fd, &wset))
|
|
select_result(fd, 2);
|
|
}
|
|
|
|
if (FD_ISSET(signalpipe[0], &rset)) {
|
|
char c[1];
|
|
struct winsize size;
|
|
read(signalpipe[0], c, 1); /* ignore its value; it'll be `x' */
|
|
if (ioctl(0, TIOCGWINSZ, (void *)&size) >= 0)
|
|
back->size(backhandle, size.ws_col, size.ws_row);
|
|
}
|
|
|
|
if (FD_ISSET(0, &rset)) {
|
|
char buf[4096];
|
|
int ret;
|
|
|
|
if (connopen && back->socket(backhandle) != NULL) {
|
|
ret = read(0, buf, sizeof(buf));
|
|
if (ret < 0) {
|
|
perror("stdin: read");
|
|
exit(1);
|
|
} else if (ret == 0) {
|
|
back->special(backhandle, TS_EOF);
|
|
sending = FALSE; /* send nothing further after this */
|
|
} else {
|
|
back->send(backhandle, buf, ret);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (FD_ISSET(1, &wset)) {
|
|
try_output(0);
|
|
}
|
|
|
|
if (FD_ISSET(2, &wset)) {
|
|
try_output(1);
|
|
}
|
|
|
|
if ((!connopen || back->socket(backhandle) == NULL) &&
|
|
bufchain_size(&stdout_data) == 0 &&
|
|
bufchain_size(&stderr_data) == 0)
|
|
break; /* we closed the connection */
|
|
}
|
|
exitcode = back->exitcode(backhandle);
|
|
if (exitcode < 0) {
|
|
fprintf(stderr, "Remote process exit code unavailable\n");
|
|
exitcode = 1; /* this is an error condition */
|
|
}
|
|
cleanup_exit(exitcode);
|
|
return exitcode; /* shouldn't happen, but placates gcc */
|
|
}
|