зеркало из https://github.com/github/putty.git
785 строки
19 KiB
C
785 строки
19 KiB
C
/*
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* Pseudo-tty backend for pterm.
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*
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* Unlike the other backends, data for this one is not neatly
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* encapsulated into a data structure, because it wouldn't make
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* sense to do so - the utmp stuff has to be done before a backend
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* is initialised, and starting a second pterm from the same
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* process would therefore be infeasible because privileges would
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* already have been dropped. Hence, I haven't bothered to keep the
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* data dynamically allocated: instead, the backend handle is just
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* a null pointer and ignored everywhere.
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*/
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#define _XOPEN_SOURCE
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#define _XOPEN_SOURCE_EXTENDED
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#define _GNU_SOURCE
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#include <features.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <grp.h>
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#include <utmp.h>
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#include <pwd.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include "putty.h"
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#ifndef FALSE
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#define FALSE 0
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#endif
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#ifndef TRUE
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#define TRUE 1
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#endif
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#ifndef UTMP_FILE
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#define UTMP_FILE "/var/run/utmp"
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#endif
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#ifndef WTMP_FILE
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#define WTMP_FILE "/var/log/wtmp"
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#endif
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#ifndef LASTLOG_FILE
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#ifdef _PATH_LASTLOG
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#define LASTLOG_FILE _PATH_LASTLOG
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#else
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#define LASTLOG_FILE "/var/log/lastlog"
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#endif
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#endif
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/*
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* Set up a default for vaguely sane systems. The idea is that if
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* OMIT_UTMP is not defined, then at least one of the symbols which
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* enable particular forms of utmp processing should be, if only so
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* that a link error can warn you that you should have defined
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* OMIT_UTMP if you didn't want any. Currently HAVE_PUTUTLINE is
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* the only such symbol.
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*/
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#ifndef OMIT_UTMP
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#if !defined HAVE_PUTUTLINE
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#define HAVE_PUTUTLINE
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#endif
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#endif
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static Config pty_cfg;
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static int pty_master_fd;
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static void *pty_frontend;
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static char pty_name[FILENAME_MAX];
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static int pty_signal_pipe[2];
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static int pty_stamped_utmp = 0;
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static int pty_child_pid;
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static int pty_utmp_helper_pid, pty_utmp_helper_pipe;
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static int pty_term_width, pty_term_height;
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static int pty_child_dead, pty_finished;
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static int pty_exit_code;
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#ifndef OMIT_UTMP
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static struct utmp utmp_entry;
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#endif
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char **pty_argv;
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int use_pty_argv = TRUE;
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static void pty_close(void);
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static void setup_utmp(char *ttyname, char *location)
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{
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#ifndef OMIT_UTMP
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#ifdef HAVE_LASTLOG
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struct lastlog lastlog_entry;
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FILE *lastlog;
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#endif
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struct passwd *pw;
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FILE *wtmp;
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pw = getpwuid(getuid());
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memset(&utmp_entry, 0, sizeof(utmp_entry));
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utmp_entry.ut_type = USER_PROCESS;
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utmp_entry.ut_pid = getpid();
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strncpy(utmp_entry.ut_line, ttyname+5, lenof(utmp_entry.ut_line));
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strncpy(utmp_entry.ut_id, ttyname+8, lenof(utmp_entry.ut_id));
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strncpy(utmp_entry.ut_user, pw->pw_name, lenof(utmp_entry.ut_user));
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strncpy(utmp_entry.ut_host, location, lenof(utmp_entry.ut_host));
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time(&utmp_entry.ut_time);
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#if defined HAVE_PUTUTLINE
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utmpname(UTMP_FILE);
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setutent();
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pututline(&utmp_entry);
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endutent();
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#endif
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if ((wtmp = fopen(WTMP_FILE, "a")) != NULL) {
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fwrite(&utmp_entry, 1, sizeof(utmp_entry), wtmp);
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fclose(wtmp);
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}
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#ifdef HAVE_LASTLOG
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memset(&lastlog_entry, 0, sizeof(lastlog_entry));
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strncpy(lastlog_entry.ll_line, ttyname+5, lenof(lastlog_entry.ll_line));
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strncpy(lastlog_entry.ll_host, location, lenof(lastlog_entry.ll_host));
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time(&lastlog_entry.ll_time);
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if ((lastlog = fopen(LASTLOG_FILE, "r+")) != NULL) {
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fseek(lastlog, sizeof(lastlog_entry) * getuid(), SEEK_SET);
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fwrite(&lastlog_entry, 1, sizeof(lastlog_entry), lastlog);
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fclose(lastlog);
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}
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#endif
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pty_stamped_utmp = 1;
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#endif
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}
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static void cleanup_utmp(void)
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{
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#ifndef OMIT_UTMP
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FILE *wtmp;
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if (!pty_stamped_utmp)
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return;
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utmp_entry.ut_type = DEAD_PROCESS;
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memset(utmp_entry.ut_user, 0, lenof(utmp_entry.ut_user));
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time(&utmp_entry.ut_time);
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if ((wtmp = fopen(WTMP_FILE, "a")) != NULL) {
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fwrite(&utmp_entry, 1, sizeof(utmp_entry), wtmp);
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fclose(wtmp);
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}
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memset(utmp_entry.ut_line, 0, lenof(utmp_entry.ut_line));
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utmp_entry.ut_time = 0;
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#if defined HAVE_PUTUTLINE
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utmpname(UTMP_FILE);
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setutent();
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pututline(&utmp_entry);
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endutent();
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#endif
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pty_stamped_utmp = 0; /* ensure we never double-cleanup */
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#endif
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}
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static void sigchld_handler(int signum)
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{
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write(pty_signal_pipe[1], "x", 1);
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}
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static void fatal_sig_handler(int signum)
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{
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putty_signal(signum, SIG_DFL);
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cleanup_utmp();
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setuid(getuid());
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raise(signum);
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}
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static void pty_open_master(void)
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{
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#ifdef BSD_PTYS
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const char chars1[] = "pqrstuvwxyz";
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const char chars2[] = "0123456789abcdef";
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const char *p1, *p2;
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char master_name[20];
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struct group *gp;
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for (p1 = chars1; *p1; p1++)
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for (p2 = chars2; *p2; p2++) {
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sprintf(master_name, "/dev/pty%c%c", *p1, *p2);
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pty_master_fd = open(master_name, O_RDWR);
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if (pty_master_fd >= 0) {
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if (geteuid() == 0 ||
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access(master_name, R_OK | W_OK) == 0)
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goto got_one;
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close(pty_master_fd);
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}
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}
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/* If we get here, we couldn't get a tty at all. */
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fprintf(stderr, "pterm: unable to open a pseudo-terminal device\n");
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exit(1);
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got_one:
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strcpy(pty_name, master_name);
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pty_name[5] = 't'; /* /dev/ptyXX -> /dev/ttyXX */
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/* We need to chown/chmod the /dev/ttyXX device. */
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gp = getgrnam("tty");
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chown(pty_name, getuid(), gp ? gp->gr_gid : -1);
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chmod(pty_name, 0600);
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#else
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pty_master_fd = open("/dev/ptmx", O_RDWR);
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if (pty_master_fd < 0) {
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perror("/dev/ptmx: open");
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exit(1);
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}
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if (grantpt(pty_master_fd) < 0) {
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perror("grantpt");
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exit(1);
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}
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if (unlockpt(pty_master_fd) < 0) {
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perror("unlockpt");
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exit(1);
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}
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pty_name[FILENAME_MAX-1] = '\0';
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strncpy(pty_name, ptsname(pty_master_fd), FILENAME_MAX-1);
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#endif
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}
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/*
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* Pre-initialisation. This is here to get around the fact that GTK
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* doesn't like being run in setuid/setgid programs (probably
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* sensibly). So before we initialise GTK - and therefore before we
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* even process the command line - we check to see if we're running
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* set[ug]id. If so, we open our pty master _now_, chown it as
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* necessary, and drop privileges. We can always close it again
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* later. If we're potentially going to be doing utmp as well, we
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* also fork off a utmp helper process and communicate with it by
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* means of a pipe; the utmp helper will keep privileges in order
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* to clean up utmp when we exit (i.e. when its end of our pipe
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* closes).
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*/
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void pty_pre_init(void)
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{
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pid_t pid;
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int pipefd[2];
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/* set the child signal handler straight away; it needs to be set
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* before we ever fork. */
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putty_signal(SIGCHLD, sigchld_handler);
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pty_master_fd = -1;
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if (geteuid() != getuid() || getegid() != getgid()) {
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pty_open_master();
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}
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#ifndef OMIT_UTMP
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/*
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* Fork off the utmp helper.
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*/
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if (pipe(pipefd) < 0) {
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perror("pterm: pipe");
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exit(1);
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}
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pid = fork();
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if (pid < 0) {
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perror("pterm: fork");
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exit(1);
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} else if (pid == 0) {
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char display[128], buffer[128];
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int dlen, ret;
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close(pipefd[1]);
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/*
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* Now sit here until we receive a display name from the
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* other end of the pipe, and then stamp utmp. Unstamp utmp
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* again, and exit, when the pipe closes.
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*/
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dlen = 0;
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while (1) {
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ret = read(pipefd[0], buffer, lenof(buffer));
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if (ret <= 0) {
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cleanup_utmp();
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_exit(0);
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} else if (!pty_stamped_utmp) {
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if (dlen < lenof(display))
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memcpy(display+dlen, buffer,
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min(ret, lenof(display)-dlen));
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if (buffer[ret-1] == '\0') {
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/*
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* Now we have a display name. NUL-terminate
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* it, and stamp utmp.
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*/
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display[lenof(display)-1] = '\0';
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/*
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* Trap as many fatal signals as we can in the
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* hope of having the best possible chance to
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* clean up utmp before termination. We are
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* unfortunately unprotected against SIGKILL,
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* but that's life.
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*/
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putty_signal(SIGHUP, fatal_sig_handler);
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putty_signal(SIGINT, fatal_sig_handler);
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putty_signal(SIGQUIT, fatal_sig_handler);
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putty_signal(SIGILL, fatal_sig_handler);
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putty_signal(SIGABRT, fatal_sig_handler);
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putty_signal(SIGFPE, fatal_sig_handler);
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putty_signal(SIGPIPE, fatal_sig_handler);
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putty_signal(SIGALRM, fatal_sig_handler);
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putty_signal(SIGTERM, fatal_sig_handler);
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putty_signal(SIGSEGV, fatal_sig_handler);
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putty_signal(SIGUSR1, fatal_sig_handler);
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putty_signal(SIGUSR2, fatal_sig_handler);
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#ifdef SIGBUS
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putty_signal(SIGBUS, fatal_sig_handler);
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#endif
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#ifdef SIGPOLL
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putty_signal(SIGPOLL, fatal_sig_handler);
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#endif
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#ifdef SIGPROF
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putty_signal(SIGPROF, fatal_sig_handler);
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#endif
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#ifdef SIGSYS
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putty_signal(SIGSYS, fatal_sig_handler);
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#endif
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#ifdef SIGTRAP
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putty_signal(SIGTRAP, fatal_sig_handler);
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#endif
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#ifdef SIGVTALRM
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putty_signal(SIGVTALRM, fatal_sig_handler);
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#endif
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#ifdef SIGXCPU
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putty_signal(SIGXCPU, fatal_sig_handler);
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#endif
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#ifdef SIGXFSZ
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putty_signal(SIGXFSZ, fatal_sig_handler);
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#endif
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#ifdef SIGIO
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putty_signal(SIGIO, fatal_sig_handler);
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#endif
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setup_utmp(pty_name, display);
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}
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}
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}
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} else {
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close(pipefd[0]);
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pty_utmp_helper_pid = pid;
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pty_utmp_helper_pipe = pipefd[1];
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}
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#endif
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/* Drop privs. */
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{
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int gid = getgid(), uid = getuid();
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#ifndef HAVE_NO_SETRESUID
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int setresgid(gid_t, gid_t, gid_t);
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int setresuid(uid_t, uid_t, uid_t);
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setresgid(gid, gid, gid);
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setresuid(uid, uid, uid);
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#else
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setgid(getgid());
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setuid(getuid());
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#endif
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}
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}
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int pty_select_result(int fd, int event)
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{
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char buf[4096];
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int ret;
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int finished = FALSE;
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if (fd == pty_master_fd && event == 1) {
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ret = read(pty_master_fd, buf, sizeof(buf));
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/*
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* Clean termination condition is that either ret == 0, or ret
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* < 0 and errno == EIO. Not sure why the latter, but it seems
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* to happen. Boo.
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*/
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if (ret == 0 || (ret < 0 && errno == EIO)) {
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/*
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* We assume a clean exit if the pty has closed but the
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* actual child process hasn't. The only way I can
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* imagine this happening is if it detaches itself from
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* the pty and goes daemonic - in which case the
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* expected usage model would precisely _not_ be for
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* the pterm window to hang around!
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*/
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finished = TRUE;
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if (!pty_child_dead)
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pty_exit_code = 0;
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} else if (ret < 0) {
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perror("read pty master");
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exit(1);
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} else if (ret > 0) {
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from_backend(pty_frontend, 0, buf, ret);
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}
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} else if (fd == pty_signal_pipe[0]) {
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pid_t pid;
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int status;
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char c[1];
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read(pty_signal_pipe[0], c, 1); /* ignore its value; it'll be `x' */
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do {
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pid = waitpid(-1, &status, WNOHANG);
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if (pid == pty_child_pid &&
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(WIFEXITED(status) || WIFSIGNALED(status))) {
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/*
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* The primary child process died. We could keep
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* the terminal open for remaining subprocesses to
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* output to, but conventional wisdom seems to feel
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* that that's the Wrong Thing for an xterm-alike,
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* so we bail out now (though we don't necessarily
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* _close_ the window, depending on the state of
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* Close On Exit). This would be easy enough to
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* change or make configurable if necessary.
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*/
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pty_exit_code = status;
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pty_child_dead = TRUE;
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finished = TRUE;
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}
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} while(pid > 0);
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}
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if (finished && !pty_finished) {
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uxsel_del(pty_master_fd);
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pty_close();
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pty_master_fd = -1;
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pty_finished = TRUE;
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/*
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* This is a slight layering-violation sort of hack: only
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* if we're not closing on exit (COE is set to Never, or to
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* Only On Clean and it wasn't a clean exit) do we output a
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* `terminated' message.
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*/
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if (pty_cfg.close_on_exit == FORCE_OFF ||
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(pty_cfg.close_on_exit == AUTO && pty_exit_code != 0)) {
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char message[512];
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if (WIFEXITED(pty_exit_code))
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sprintf(message, "\r\n[pterm: process terminated with exit"
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" code %d]\r\n", WEXITSTATUS(pty_exit_code));
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else if (WIFSIGNALED(pty_exit_code))
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#ifdef HAVE_NO_STRSIGNAL
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sprintf(message, "\r\n[pterm: process terminated on signal"
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" %d]\r\n", WTERMSIG(pty_exit_code));
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#else
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sprintf(message, "\r\n[pterm: process terminated on signal"
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" %d (%.400s)]\r\n", WTERMSIG(pty_exit_code),
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strsignal(WTERMSIG(pty_exit_code)));
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#endif
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from_backend(pty_frontend, 0, message, strlen(message));
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}
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}
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return !finished;
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}
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static void pty_uxsel_setup(void)
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{
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uxsel_set(pty_master_fd, 1, pty_select_result);
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uxsel_set(pty_signal_pipe[0], 1, pty_select_result);
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}
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/*
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* Called to set up the pty.
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*
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* Returns an error message, or NULL on success.
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*
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* Also places the canonical host name into `realhost'. It must be
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* freed by the caller.
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*/
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static const char *pty_init(void *frontend, void **backend_handle, Config *cfg,
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char *host, int port, char **realhost, int nodelay)
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{
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int slavefd;
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pid_t pid, pgrp;
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long windowid;
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pty_frontend = frontend;
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*backend_handle = NULL; /* we can't sensibly use this, sadly */
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pty_cfg = *cfg; /* structure copy */
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pty_term_width = cfg->width;
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pty_term_height = cfg->height;
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if (pty_master_fd < 0)
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pty_open_master();
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/*
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* Set the backspace character to be whichever of ^H and ^? is
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* specified by bksp_is_delete.
|
|
*/
|
|
{
|
|
struct termios attrs;
|
|
tcgetattr(pty_master_fd, &attrs);
|
|
attrs.c_cc[VERASE] = cfg->bksp_is_delete ? '\177' : '\010';
|
|
tcsetattr(pty_master_fd, TCSANOW, &attrs);
|
|
}
|
|
|
|
/*
|
|
* Stamp utmp (that is, tell the utmp helper process to do so),
|
|
* or not.
|
|
*/
|
|
if (!cfg->stamp_utmp) {
|
|
close(pty_utmp_helper_pipe); /* just let the child process die */
|
|
pty_utmp_helper_pipe = -1;
|
|
} else {
|
|
char *location = get_x_display(pty_frontend);
|
|
int len = strlen(location)+1, pos = 0; /* +1 to include NUL */
|
|
while (pos < len) {
|
|
int ret = write(pty_utmp_helper_pipe, location+pos, len - pos);
|
|
if (ret < 0) {
|
|
perror("pterm: writing to utmp helper process");
|
|
close(pty_utmp_helper_pipe); /* arrgh, just give up */
|
|
pty_utmp_helper_pipe = -1;
|
|
break;
|
|
}
|
|
pos += ret;
|
|
}
|
|
}
|
|
|
|
windowid = get_windowid(pty_frontend);
|
|
|
|
/*
|
|
* Fork and execute the command.
|
|
*/
|
|
pid = fork();
|
|
if (pid < 0) {
|
|
perror("fork");
|
|
exit(1);
|
|
}
|
|
|
|
if (pid == 0) {
|
|
int i;
|
|
/*
|
|
* We are the child.
|
|
*/
|
|
|
|
slavefd = open(pty_name, O_RDWR);
|
|
if (slavefd < 0) {
|
|
perror("slave pty: open");
|
|
_exit(1);
|
|
}
|
|
|
|
close(pty_master_fd);
|
|
fcntl(slavefd, F_SETFD, 0); /* don't close on exec */
|
|
dup2(slavefd, 0);
|
|
dup2(slavefd, 1);
|
|
dup2(slavefd, 2);
|
|
setsid();
|
|
ioctl(slavefd, TIOCSCTTY, 1);
|
|
pgrp = getpid();
|
|
tcsetpgrp(slavefd, pgrp);
|
|
setpgrp();
|
|
close(open(pty_name, O_WRONLY, 0));
|
|
setpgrp();
|
|
/* Close everything _else_, for tidiness. */
|
|
for (i = 3; i < 1024; i++)
|
|
close(i);
|
|
{
|
|
char term_env_var[10 + sizeof(cfg->termtype)];
|
|
sprintf(term_env_var, "TERM=%s", cfg->termtype);
|
|
putenv(term_env_var);
|
|
}
|
|
{
|
|
char windowid_env_var[40];
|
|
sprintf(windowid_env_var, "WINDOWID=%ld", windowid);
|
|
putenv(windowid_env_var);
|
|
}
|
|
/*
|
|
* SIGINT and SIGQUIT may have been set to ignored by our
|
|
* parent, particularly by things like sh -c 'pterm &' and
|
|
* some window managers. Reverse this for our child process.
|
|
*/
|
|
putty_signal(SIGINT, SIG_DFL);
|
|
putty_signal(SIGQUIT, SIG_DFL);
|
|
if (pty_argv)
|
|
execvp(pty_argv[0], pty_argv);
|
|
else {
|
|
char *shell = getenv("SHELL");
|
|
char *shellname;
|
|
if (cfg->login_shell) {
|
|
char *p = strrchr(shell, '/');
|
|
shellname = snewn(2+strlen(shell), char);
|
|
p = p ? p+1 : shell;
|
|
sprintf(shellname, "-%s", p);
|
|
} else
|
|
shellname = shell;
|
|
execl(getenv("SHELL"), shellname, NULL);
|
|
}
|
|
|
|
/*
|
|
* If we're here, exec has gone badly foom.
|
|
*/
|
|
perror("exec");
|
|
_exit(127);
|
|
} else {
|
|
pty_child_pid = pid;
|
|
pty_child_dead = FALSE;
|
|
pty_finished = FALSE;
|
|
}
|
|
|
|
if (pipe(pty_signal_pipe) < 0) {
|
|
perror("pipe");
|
|
exit(1);
|
|
}
|
|
pty_uxsel_setup();
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void pty_reconfig(void *handle, Config *cfg)
|
|
{
|
|
/*
|
|
* We don't have much need to reconfigure this backend, but
|
|
* unfortunately we do need to pick up the setting of Close On
|
|
* Exit so we know whether to give a `terminated' message.
|
|
*/
|
|
pty_cfg = *cfg; /* structure copy */
|
|
}
|
|
|
|
/*
|
|
* Stub routine (never called in pterm).
|
|
*/
|
|
static void pty_free(void *handle)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Called to send data down the pty.
|
|
*/
|
|
static int pty_send(void *handle, char *buf, int len)
|
|
{
|
|
if (pty_master_fd < 0)
|
|
return 0; /* ignore all writes if fd closed */
|
|
|
|
while (len > 0) {
|
|
int ret = write(pty_master_fd, buf, len);
|
|
if (ret < 0) {
|
|
perror("write pty master");
|
|
exit(1);
|
|
}
|
|
buf += ret;
|
|
len -= ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void pty_close(void)
|
|
{
|
|
if (pty_master_fd >= 0) {
|
|
close(pty_master_fd);
|
|
pty_master_fd = -1;
|
|
}
|
|
if (pty_utmp_helper_pipe >= 0) {
|
|
close(pty_utmp_helper_pipe); /* this causes utmp to be cleaned up */
|
|
pty_utmp_helper_pipe = -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called to query the current socket sendability status.
|
|
*/
|
|
static int pty_sendbuffer(void *handle)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called to set the size of the window
|
|
*/
|
|
static void pty_size(void *handle, int width, int height)
|
|
{
|
|
struct winsize size;
|
|
|
|
pty_term_width = width;
|
|
pty_term_height = height;
|
|
|
|
size.ws_row = (unsigned short)pty_term_height;
|
|
size.ws_col = (unsigned short)pty_term_width;
|
|
size.ws_xpixel = (unsigned short) pty_term_width *
|
|
font_dimension(pty_frontend, 0);
|
|
size.ws_ypixel = (unsigned short) pty_term_height *
|
|
font_dimension(pty_frontend, 1);
|
|
ioctl(pty_master_fd, TIOCSWINSZ, (void *)&size);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Send special codes.
|
|
*/
|
|
static void pty_special(void *handle, Telnet_Special code)
|
|
{
|
|
/* Do nothing! */
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Return a list of the special codes that make sense in this
|
|
* protocol.
|
|
*/
|
|
static const struct telnet_special *pty_get_specials(void *handle)
|
|
{
|
|
/*
|
|
* Hmm. When I get round to having this actually usable, it
|
|
* might be quite nice to have the ability to deliver a few
|
|
* well chosen signals to the child process - SIGINT, SIGTERM,
|
|
* SIGKILL at least.
|
|
*/
|
|
return NULL;
|
|
}
|
|
|
|
static Socket pty_socket(void *handle)
|
|
{
|
|
return NULL; /* shouldn't ever be needed */
|
|
}
|
|
|
|
static int pty_sendok(void *handle)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static void pty_unthrottle(void *handle, int backlog)
|
|
{
|
|
/* do nothing */
|
|
}
|
|
|
|
static int pty_ldisc(void *handle, int option)
|
|
{
|
|
return 0; /* neither editing nor echoing */
|
|
}
|
|
|
|
static void pty_provide_ldisc(void *handle, void *ldisc)
|
|
{
|
|
/* This is a stub. */
|
|
}
|
|
|
|
static void pty_provide_logctx(void *handle, void *logctx)
|
|
{
|
|
/* This is a stub. */
|
|
}
|
|
|
|
static int pty_exitcode(void *handle)
|
|
{
|
|
if (!pty_finished)
|
|
return -1; /* not dead yet */
|
|
else
|
|
return pty_exit_code;
|
|
}
|
|
|
|
Backend pty_backend = {
|
|
pty_init,
|
|
pty_free,
|
|
pty_reconfig,
|
|
pty_send,
|
|
pty_sendbuffer,
|
|
pty_size,
|
|
pty_special,
|
|
pty_get_specials,
|
|
pty_socket,
|
|
pty_exitcode,
|
|
pty_sendok,
|
|
pty_ldisc,
|
|
pty_provide_ldisc,
|
|
pty_provide_logctx,
|
|
pty_unthrottle,
|
|
1
|
|
};
|