/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "sd-event.h" #include "alloc-util.h" #include "ansi-color.h" #include "env-util.h" #include "errno-util.h" #include "extract-word.h" #include "fd-util.h" #include "io-util.h" #include "log.h" #include "macro.h" #include "ptyfwd.h" #include "stat-util.h" #include "strv.h" #include "terminal-util.h" #include "time-util.h" typedef enum AnsiColorState { ANSI_COLOR_STATE_TEXT, ANSI_COLOR_STATE_ESC, ANSI_COLOR_STATE_CSI_SEQUENCE, ANSI_COLOR_STATE_OSC_SEQUENCE, ANSI_COLOR_STATE_NEWLINE, ANSI_COLOR_STATE_CARRIAGE_RETURN, _ANSI_COLOR_STATE_MAX, _ANSI_COLOR_STATE_INVALID = -EINVAL, } AnsiColorState; struct PTYForward { sd_event *event; int input_fd; int output_fd; int master; PTYForwardFlags flags; sd_event_source *stdin_event_source; sd_event_source *stdout_event_source; sd_event_source *master_event_source; sd_event_source *sigwinch_event_source; struct termios saved_stdin_attr; struct termios saved_stdout_attr; bool close_input_fd:1; bool close_output_fd:1; bool saved_stdin:1; bool saved_stdout:1; bool stdin_readable:1; bool stdin_hangup:1; bool stdout_writable:1; bool stdout_hangup:1; bool master_readable:1; bool master_writable:1; bool master_hangup:1; bool read_from_master:1; bool done:1; bool drain:1; bool last_char_set:1; char last_char; char in_buffer[LINE_MAX], *out_buffer; size_t out_buffer_size; size_t in_buffer_full, out_buffer_full; usec_t escape_timestamp; unsigned escape_counter; PTYForwardHandler handler; void *userdata; char *background_color; AnsiColorState ansi_color_state; char *csi_sequence; char *osc_sequence; char *title; /* Window title to show by default */ char *title_prefix; /* If terminal client overrides window title, prefix this string */ }; #define ESCAPE_USEC (1*USEC_PER_SEC) static void pty_forward_disconnect(PTYForward *f) { if (!f) return; f->stdin_event_source = sd_event_source_unref(f->stdin_event_source); f->stdout_event_source = sd_event_source_unref(f->stdout_event_source); f->master_event_source = sd_event_source_unref(f->master_event_source); f->sigwinch_event_source = sd_event_source_unref(f->sigwinch_event_source); f->event = sd_event_unref(f->event); if (f->output_fd >= 0) { if (f->saved_stdout) (void) tcsetattr(f->output_fd, TCSANOW, &f->saved_stdout_attr); /* STDIN/STDOUT should not be non-blocking normally, so let's reset it */ (void) fd_nonblock(f->output_fd, false); if (colors_enabled()) { (void) loop_write(f->output_fd, ANSI_NORMAL ANSI_ERASE_TO_END_OF_SCREEN, SIZE_MAX); if (f->title) (void) loop_write(f->output_fd, ANSI_WINDOW_TITLE_POP, SIZE_MAX); } if (f->close_output_fd) f->output_fd = safe_close(f->output_fd); } if (f->input_fd >= 0) { if (f->saved_stdin) (void) tcsetattr(f->input_fd, TCSANOW, &f->saved_stdin_attr); (void) fd_nonblock(f->input_fd, false); if (f->close_input_fd) f->input_fd = safe_close(f->input_fd); } f->saved_stdout = f->saved_stdin = false; f->out_buffer = mfree(f->out_buffer); f->out_buffer_size = 0; f->out_buffer_full = 0; f->in_buffer_full = 0; f->csi_sequence = mfree(f->csi_sequence); f->osc_sequence = mfree(f->osc_sequence); f->ansi_color_state = _ANSI_COLOR_STATE_INVALID; } static int pty_forward_done(PTYForward *f, int rcode) { _cleanup_(sd_event_unrefp) sd_event *e = NULL; assert(f); if (f->done) return 0; e = sd_event_ref(f->event); f->done = true; pty_forward_disconnect(f); if (f->handler) return f->handler(f, rcode, f->userdata); else return sd_event_exit(e, rcode < 0 ? EXIT_FAILURE : rcode); } static bool look_for_escape(PTYForward *f, const char *buffer, size_t n) { const char *p; assert(f); assert(buffer); assert(n > 0); for (p = buffer; p < buffer + n; p++) { /* Check for ^] */ if (*p == 0x1D) { usec_t nw = now(CLOCK_MONOTONIC); if (f->escape_counter == 0 || nw > f->escape_timestamp + ESCAPE_USEC) { f->escape_timestamp = nw; f->escape_counter = 1; } else { (f->escape_counter)++; if (f->escape_counter >= 3) return true; } } else { f->escape_timestamp = 0; f->escape_counter = 0; } } return false; } static bool ignore_vhangup(PTYForward *f) { assert(f); if (f->flags & PTY_FORWARD_IGNORE_VHANGUP) return true; if ((f->flags & PTY_FORWARD_IGNORE_INITIAL_VHANGUP) && !f->read_from_master) return true; return false; } static bool drained(PTYForward *f) { int q = 0; assert(f); if (f->out_buffer_full > 0) return false; if (f->master_readable) return false; if (ioctl(f->master, TIOCINQ, &q) < 0) log_debug_errno(errno, "TIOCINQ failed on master: %m"); else if (q > 0) return false; if (ioctl(f->master, TIOCOUTQ, &q) < 0) log_debug_errno(errno, "TIOCOUTQ failed on master: %m"); else if (q > 0) return false; return true; } static char *background_color_sequence(PTYForward *f) { assert(f); assert(f->background_color); return strjoin("\x1B[", f->background_color, "m"); } static int insert_string(PTYForward *f, size_t offset, const char *s) { assert(f); assert(offset <= f->out_buffer_full); assert(s); size_t l = strlen(s); assert(l <= INT_MAX); /* Make sure we can still return this */ void *p = realloc(f->out_buffer, MAX(f->out_buffer_full + l, (size_t) LINE_MAX)); if (!p) return -ENOMEM; f->out_buffer = p; f->out_buffer_size = MALLOC_SIZEOF_SAFE(f->out_buffer); memmove(f->out_buffer + offset + l, f->out_buffer + offset, f->out_buffer_full - offset); memcpy(f->out_buffer + offset, s, l); f->out_buffer_full += l; return (int) l; } static int insert_background_color(PTYForward *f, size_t offset) { _cleanup_free_ char *s = NULL; assert(f); if (!f->background_color) return 0; s = background_color_sequence(f); if (!s) return -ENOMEM; return insert_string(f, offset, s); } static int is_csi_background_reset_sequence(const char *seq) { enum { COLOR_TOKEN_NO, COLOR_TOKEN_START, COLOR_TOKEN_8BIT, COLOR_TOKEN_24BIT_R, COLOR_TOKEN_24BIT_G, COLOR_TOKEN_24BIT_B, } token_state = COLOR_TOKEN_NO; bool b = false; int r; assert(seq); /* This parses CSI "m" sequences, and determines if they reset the background color. If so returns * 1. This can then be used to insert another sequence that sets the color to the desired * replacement. */ for (;;) { _cleanup_free_ char *token = NULL; r = extract_first_word(&seq, &token, ";", EXTRACT_RELAX|EXTRACT_DONT_COALESCE_SEPARATORS|EXTRACT_RETAIN_ESCAPE); if (r < 0) return r; if (r == 0) break; switch (token_state) { case COLOR_TOKEN_NO: if (STR_IN_SET(token, "", "0", "00", "49")) b = true; /* These tokens set the background back to normal */ else if (STR_IN_SET(token, "40", "41", "42", "43", "44", "45", "46", "47", "48")) b = false; /* And these tokens set them to something other than normal */ if (STR_IN_SET(token, "38", "48", "58")) token_state = COLOR_TOKEN_START; /* These tokens mean an 8bit or 24bit color will follow */ break; case COLOR_TOKEN_START: if (STR_IN_SET(token, "5", "05")) token_state = COLOR_TOKEN_8BIT; /* 8bit color */ else if (STR_IN_SET(token, "2", "02")) token_state = COLOR_TOKEN_24BIT_R; /* 24bit color */ else token_state = COLOR_TOKEN_NO; /* something weird? */ break; case COLOR_TOKEN_24BIT_R: token_state = COLOR_TOKEN_24BIT_G; break; case COLOR_TOKEN_24BIT_G: token_state = COLOR_TOKEN_24BIT_B; break; case COLOR_TOKEN_8BIT: case COLOR_TOKEN_24BIT_B: token_state = COLOR_TOKEN_NO; break; } } return b; } static int insert_background_fix(PTYForward *f, size_t offset) { assert(f); if (!f->background_color) return 0; if (!is_csi_background_reset_sequence(strempty(f->csi_sequence))) return 0; _cleanup_free_ char *s = NULL; s = strjoin(";", f->background_color); if (!s) return -ENOMEM; return insert_string(f, offset, s); } bool shall_set_terminal_title(void) { static int cache = -1; if (cache >= 0) return cache; cache = getenv_bool("SYSTEMD_ADJUST_TERMINAL_TITLE"); if (cache == -ENXIO) return (cache = true); if (cache < 0) log_debug_errno(cache, "Failed to parse $SYSTEMD_ADJUST_TERMINAL_TITLE, leaving terminal title setting enabled: %m"); return cache != 0; } static int insert_window_title_fix(PTYForward *f, size_t offset) { assert(f); if (!f->title_prefix) return 0; if (!f->osc_sequence) return 0; const char *t = startswith(f->osc_sequence, "0;"); /* Set window title OSC sequence*/ if (!t) return 0; _cleanup_free_ char *joined = strjoin(ANSI_OSC "0;", f->title_prefix, t, ANSI_ST); if (!joined) return -ENOMEM; return insert_string(f, offset, joined); } static int pty_forward_ansi_process(PTYForward *f, size_t offset) { int r; assert(f); assert(offset <= f->out_buffer_full); if (!f->background_color && !f->title_prefix) return 0; if (FLAGS_SET(f->flags, PTY_FORWARD_DUMB_TERMINAL)) return 0; for (size_t i = offset; i < f->out_buffer_full; i++) { char c = f->out_buffer[i]; switch (f->ansi_color_state) { case ANSI_COLOR_STATE_TEXT: break; case ANSI_COLOR_STATE_NEWLINE: case ANSI_COLOR_STATE_CARRIAGE_RETURN: /* Immediately after a newline (ASCII 10) or carriage return (ASCII 13) insert an * ANSI sequence set the background color back. */ r = insert_background_color(f, i); if (r < 0) return r; i += r; break; case ANSI_COLOR_STATE_ESC: if (c == '[') { f->ansi_color_state = ANSI_COLOR_STATE_CSI_SEQUENCE; continue; } else if (c == ']') { f->ansi_color_state = ANSI_COLOR_STATE_OSC_SEQUENCE; continue; } else if (c == 'c') { /* "Full reset" aka "Reset to initial state"*/ r = insert_background_color(f, i+1); if (r < 0) return r; i += r; f->ansi_color_state = ANSI_COLOR_STATE_TEXT; continue; } break; case ANSI_COLOR_STATE_CSI_SEQUENCE: if (c >= 0x20 && c <= 0x3F) { /* If this is a "parameter" or "intermediary" byte (i.e. ranges 0x20…0x2F and * 0x30…0x3F) then we are still in the CSI sequence */ if (strlen_ptr(f->csi_sequence) >= 64) { /* Safety check: lets not accept unbounded CSI sequences */ f->csi_sequence = mfree(f->csi_sequence); break; } else if (!strextend(&f->csi_sequence, CHAR_TO_STR(c))) return -ENOMEM; } else { /* Otherwise, the CSI sequence is over */ if (c == 'p' && streq_ptr(f->csi_sequence, "!")) { /* CSI ! p → "Soft Reset", let's immediately fix our bg color again */ r = insert_background_color(f, i+1); if (r < 0) return r; i += r; } else if (c == 'm') { /* This is an "SGR" (Select Graphic Rendition) sequence. Patch in our background color. */ r = insert_background_fix(f, i); if (r < 0) return r; i += r; } f->csi_sequence = mfree(f->csi_sequence); f->ansi_color_state = ANSI_COLOR_STATE_TEXT; } continue; case ANSI_COLOR_STATE_OSC_SEQUENCE: if ((uint8_t) c >= ' ') { if (strlen_ptr(f->osc_sequence) >= 64) { /* Safety check: lets not accept unbounded OSC sequences */ f->osc_sequence = mfree(f->osc_sequence); break; } else if (!strextend(&f->osc_sequence, CHAR_TO_STR(c))) return -ENOMEM; } else { /* Otherwise, the OSC sequence is over * * There are three documented ways to end an OSC sequence: * 1. BEL aka ^G aka \x07 * 2. \x9c * 3. \x1b\x5c * since we cannot look ahead to see if the Esc is followed by a "\" * we cut a corner here and assume it will be "\"e. * * Note that we do not support \x9c here, because that's also a valid UTF8 * codepoint, and that would create ambiguity. Various terminal emulators * similar do not support it. */ if (IN_SET(c, '\x07', '\x1b')) { r = insert_window_title_fix(f, i+1); if (r < 0) return r; i += r; } f->osc_sequence = mfree(f->osc_sequence); f->ansi_color_state = ANSI_COLOR_STATE_TEXT; } continue; default: assert_not_reached(); } if (c == '\n') f->ansi_color_state = ANSI_COLOR_STATE_NEWLINE; else if (c == '\r') f->ansi_color_state = ANSI_COLOR_STATE_CARRIAGE_RETURN; else if (c == 0x1B) /* ESC */ f->ansi_color_state = ANSI_COLOR_STATE_ESC; else f->ansi_color_state = ANSI_COLOR_STATE_TEXT; } return 0; } static int do_shovel(PTYForward *f) { ssize_t k; int r; assert(f); if (f->out_buffer_size == 0 && !FLAGS_SET(f->flags, PTY_FORWARD_DUMB_TERMINAL)) { /* If the output hasn't been allocated yet, we are at the beginning of the first * shovelling. Hence, possibly send some initial ANSI sequences. But do so only if we are * talking to an actual TTY. */ if (f->background_color) { /* Erase the first line when we start */ f->out_buffer = background_color_sequence(f); if (!f->out_buffer) return log_oom(); if (!strextend(&f->out_buffer, ANSI_ERASE_TO_END_OF_LINE)) return log_oom(); } if (f->title) { if (!strextend(&f->out_buffer, ANSI_WINDOW_TITLE_PUSH ANSI_OSC "2;", f->title, ANSI_ST)) return log_oom(); } if (f->out_buffer) { f->out_buffer_full = strlen(f->out_buffer); f->out_buffer_size = MALLOC_SIZEOF_SAFE(f->out_buffer); } } if (f->out_buffer_size < LINE_MAX) { /* Make sure we always have room for at least one "line" */ void *p = realloc(f->out_buffer, LINE_MAX); if (!p) return log_oom(); f->out_buffer = p; f->out_buffer_size = MALLOC_SIZEOF_SAFE(p); } while ((f->stdin_readable && f->in_buffer_full <= 0) || (f->master_writable && f->in_buffer_full > 0) || (f->master_readable && f->out_buffer_full <= 0) || (f->stdout_writable && f->out_buffer_full > 0)) { if (f->stdin_readable && f->in_buffer_full < LINE_MAX) { k = read(f->input_fd, f->in_buffer + f->in_buffer_full, LINE_MAX - f->in_buffer_full); if (k < 0) { if (errno == EAGAIN) f->stdin_readable = false; else if (errno == EIO || ERRNO_IS_DISCONNECT(errno)) { f->stdin_readable = false; f->stdin_hangup = true; f->stdin_event_source = sd_event_source_unref(f->stdin_event_source); } else return log_error_errno(errno, "Failed to read from pty input fd: %m"); } else if (k == 0) { /* EOF on stdin */ f->stdin_readable = false; f->stdin_hangup = true; f->stdin_event_source = sd_event_source_unref(f->stdin_event_source); } else { /* Check if ^] has been pressed three times within one second. If we get this we quite * immediately. */ if (look_for_escape(f, f->in_buffer + f->in_buffer_full, k)) return -ECANCELED; f->in_buffer_full += (size_t) k; } } if (f->master_writable && f->in_buffer_full > 0) { k = write(f->master, f->in_buffer, f->in_buffer_full); if (k < 0) { if (IN_SET(errno, EAGAIN, EIO)) f->master_writable = false; else if (IN_SET(errno, EPIPE, ECONNRESET)) { f->master_writable = f->master_readable = false; f->master_hangup = true; f->master_event_source = sd_event_source_unref(f->master_event_source); } else return log_error_errno(errno, "write(): %m"); } else { assert(f->in_buffer_full >= (size_t) k); memmove(f->in_buffer, f->in_buffer + k, f->in_buffer_full - k); f->in_buffer_full -= k; } } if (f->master_readable && f->out_buffer_full < MIN(f->out_buffer_size, (size_t) LINE_MAX)) { k = read(f->master, f->out_buffer + f->out_buffer_full, f->out_buffer_size - f->out_buffer_full); if (k < 0) { /* Note that EIO on the master device might be caused by vhangup() or * temporary closing of everything on the other side, we treat it like EAGAIN * here and try again, unless ignore_vhangup is off. */ if (errno == EAGAIN || (errno == EIO && ignore_vhangup(f))) f->master_readable = false; else if (IN_SET(errno, EPIPE, ECONNRESET, EIO)) { f->master_readable = f->master_writable = false; f->master_hangup = true; f->master_event_source = sd_event_source_unref(f->master_event_source); } else return log_error_errno(errno, "Failed to read from pty master fd: %m"); } else { f->read_from_master = true; size_t scan_index = f->out_buffer_full; f->out_buffer_full += (size_t) k; r = pty_forward_ansi_process(f, scan_index); if (r < 0) return log_error_errno(r, "Failed to scan for ANSI sequences: %m"); } } if (f->stdout_writable && f->out_buffer_full > 0) { k = write(f->output_fd, f->out_buffer, f->out_buffer_full); if (k < 0) { if (errno == EAGAIN) f->stdout_writable = false; else if (errno == EIO || ERRNO_IS_DISCONNECT(errno)) { f->stdout_writable = false; f->stdout_hangup = true; f->stdout_event_source = sd_event_source_unref(f->stdout_event_source); } else return log_error_errno(errno, "Failed to write to pty output fd: %m"); } else { if (k > 0) { f->last_char = f->out_buffer[k-1]; f->last_char_set = true; } assert(f->out_buffer_full >= (size_t) k); memmove(f->out_buffer, f->out_buffer + k, f->out_buffer_full - k); f->out_buffer_full -= k; } } } if (f->stdin_hangup || f->stdout_hangup || f->master_hangup) { /* Exit the loop if any side hung up and if there's * nothing more to write or nothing we could write. */ if ((f->out_buffer_full <= 0 || f->stdout_hangup) && (f->in_buffer_full <= 0 || f->master_hangup)) return pty_forward_done(f, 0); } /* If we were asked to drain, and there's nothing more to handle from the master, then call the callback * too. */ if (f->drain && drained(f)) return pty_forward_done(f, 0); return 0; } static int shovel(PTYForward *f) { int r; assert(f); r = do_shovel(f); if (r < 0) return pty_forward_done(f, r); return r; } static int on_master_event(sd_event_source *e, int fd, uint32_t revents, void *userdata) { PTYForward *f = ASSERT_PTR(userdata); assert(e); assert(e == f->master_event_source); assert(fd >= 0); assert(fd == f->master); if (revents & (EPOLLIN|EPOLLHUP)) f->master_readable = true; if (revents & (EPOLLOUT|EPOLLHUP)) f->master_writable = true; return shovel(f); } static int on_stdin_event(sd_event_source *e, int fd, uint32_t revents, void *userdata) { PTYForward *f = ASSERT_PTR(userdata); assert(e); assert(e == f->stdin_event_source); assert(fd >= 0); assert(fd == f->input_fd); if (revents & (EPOLLIN|EPOLLHUP)) f->stdin_readable = true; return shovel(f); } static int on_stdout_event(sd_event_source *e, int fd, uint32_t revents, void *userdata) { PTYForward *f = ASSERT_PTR(userdata); assert(e); assert(e == f->stdout_event_source); assert(fd >= 0); assert(fd == f->output_fd); if (revents & (EPOLLOUT|EPOLLHUP)) f->stdout_writable = true; return shovel(f); } static int on_sigwinch_event(sd_event_source *e, const struct signalfd_siginfo *si, void *userdata) { PTYForward *f = ASSERT_PTR(userdata); struct winsize ws; assert(e); assert(e == f->sigwinch_event_source); /* The window size changed, let's forward that. */ if (ioctl(f->output_fd, TIOCGWINSZ, &ws) >= 0) (void) ioctl(f->master, TIOCSWINSZ, &ws); return 0; } int pty_forward_new( sd_event *event, int master, PTYForwardFlags flags, PTYForward **ret) { _cleanup_(pty_forward_freep) PTYForward *f = NULL; struct winsize ws; int r; assert(master >= 0); assert(ret); f = new(PTYForward, 1); if (!f) return -ENOMEM; *f = (PTYForward) { .flags = flags, .master = -EBADF, .input_fd = -EBADF, .output_fd = -EBADF, }; if (event) f->event = sd_event_ref(event); else { r = sd_event_default(&f->event); if (r < 0) return r; } if (FLAGS_SET(flags, PTY_FORWARD_READ_ONLY)) f->output_fd = STDOUT_FILENO; else { /* If we shall be invoked in interactive mode, let's switch on non-blocking mode, so that we * never end up staving one direction while we block on the other. However, let's be careful * here and not turn on O_NONBLOCK for stdin/stdout directly, but of reopened copies of * them. This has two advantages: when we are killed abruptly the stdin/stdout fds won't be * left in O_NONBLOCK state for the next process using them. In addition, if some process * running in the background wants to continue writing to our stdout it can do so without * being confused by O_NONBLOCK. * We keep O_APPEND (if present) on the output FD and (try to) keep current file position on * both input and output FD (principle of least surprise). */ f->input_fd = fd_reopen_propagate_append_and_position( STDIN_FILENO, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK); if (f->input_fd < 0) { /* Handle failures gracefully, after all certain fd types cannot be reopened * (sockets, …) */ log_debug_errno(f->input_fd, "Failed to reopen stdin, using original fd: %m"); r = fd_nonblock(STDIN_FILENO, true); if (r < 0) return r; f->input_fd = STDIN_FILENO; } else f->close_input_fd = true; f->output_fd = fd_reopen_propagate_append_and_position( STDOUT_FILENO, O_WRONLY|O_CLOEXEC|O_NOCTTY|O_NONBLOCK); if (f->output_fd < 0) { log_debug_errno(f->output_fd, "Failed to reopen stdout, using original fd: %m"); r = fd_nonblock(STDOUT_FILENO, true); if (r < 0) return r; f->output_fd = STDOUT_FILENO; } else f->close_output_fd = true; } r = fd_nonblock(master, true); if (r < 0) return r; f->master = master; /* Disable color/window title setting unless we talk to a good TTY */ if (!isatty_safe(f->output_fd) || get_color_mode() == COLOR_OFF) f->flags |= PTY_FORWARD_DUMB_TERMINAL; if (ioctl(f->output_fd, TIOCGWINSZ, &ws) < 0) /* If we can't get the resolution from the output fd, then use our internal, regular width/height, * i.e. something derived from $COLUMNS and $LINES if set. */ ws = (struct winsize) { .ws_row = lines(), .ws_col = columns(), }; (void) ioctl(master, TIOCSWINSZ, &ws); if (!FLAGS_SET(flags, PTY_FORWARD_READ_ONLY)) { bool same; assert(f->input_fd >= 0); r = fd_inode_same(f->input_fd, f->output_fd); if (r < 0) return r; same = r > 0; if (tcgetattr(f->input_fd, &f->saved_stdin_attr) >= 0) { struct termios raw_stdin_attr; f->saved_stdin = true; raw_stdin_attr = f->saved_stdin_attr; cfmakeraw(&raw_stdin_attr); if (!same) raw_stdin_attr.c_oflag = f->saved_stdin_attr.c_oflag; (void) tcsetattr(f->input_fd, TCSANOW, &raw_stdin_attr); } if (!same && tcgetattr(f->output_fd, &f->saved_stdout_attr) >= 0) { struct termios raw_stdout_attr; f->saved_stdout = true; raw_stdout_attr = f->saved_stdout_attr; cfmakeraw(&raw_stdout_attr); raw_stdout_attr.c_iflag = f->saved_stdout_attr.c_iflag; raw_stdout_attr.c_lflag = f->saved_stdout_attr.c_lflag; (void) tcsetattr(f->output_fd, TCSANOW, &raw_stdout_attr); } r = sd_event_add_io(f->event, &f->stdin_event_source, f->input_fd, EPOLLIN|EPOLLET, on_stdin_event, f); if (r < 0 && r != -EPERM) return r; if (r >= 0) (void) sd_event_source_set_description(f->stdin_event_source, "ptyfwd-stdin"); } r = sd_event_add_io(f->event, &f->stdout_event_source, f->output_fd, EPOLLOUT|EPOLLET, on_stdout_event, f); if (r == -EPERM) /* stdout without epoll support. Likely redirected to regular file. */ f->stdout_writable = true; else if (r < 0) return r; else (void) sd_event_source_set_description(f->stdout_event_source, "ptyfwd-stdout"); r = sd_event_add_io(f->event, &f->master_event_source, master, EPOLLIN|EPOLLOUT|EPOLLET, on_master_event, f); if (r < 0) return r; (void) sd_event_source_set_description(f->master_event_source, "ptyfwd-master"); r = sd_event_add_signal(f->event, &f->sigwinch_event_source, SIGWINCH|SD_EVENT_SIGNAL_PROCMASK, on_sigwinch_event, f); if (r < 0) return r; (void) sd_event_source_set_description(f->sigwinch_event_source, "ptyfwd-sigwinch"); *ret = TAKE_PTR(f); return 0; } PTYForward *pty_forward_free(PTYForward *f) { if (!f) return NULL; pty_forward_disconnect(f); free(f->background_color); free(f->title); free(f->title_prefix); return mfree(f); } int pty_forward_get_last_char(PTYForward *f, char *ch) { assert(f); assert(ch); if (!f->last_char_set) return -ENXIO; *ch = f->last_char; return 0; } int pty_forward_set_ignore_vhangup(PTYForward *f, bool b) { int r; assert(f); if (FLAGS_SET(f->flags, PTY_FORWARD_IGNORE_VHANGUP) == b) return 0; SET_FLAG(f->flags, PTY_FORWARD_IGNORE_VHANGUP, b); if (!ignore_vhangup(f)) { /* We shall now react to vhangup()s? Let's check immediately if we might be in one. */ f->master_readable = true; r = shovel(f); if (r < 0) return r; } return 0; } bool pty_forward_get_ignore_vhangup(PTYForward *f) { assert(f); return FLAGS_SET(f->flags, PTY_FORWARD_IGNORE_VHANGUP); } bool pty_forward_is_done(PTYForward *f) { assert(f); return f->done; } void pty_forward_set_handler(PTYForward *f, PTYForwardHandler cb, void *userdata) { assert(f); f->handler = cb; f->userdata = userdata; } bool pty_forward_drain(PTYForward *f) { assert(f); /* Starts draining the forwarder. Specifically: * * - Returns true if there are no unprocessed bytes from the pty, false otherwise * * - Makes sure the handler function is called the next time the number of unprocessed bytes hits zero */ f->drain = true; return drained(f); } int pty_forward_set_priority(PTYForward *f, int64_t priority) { int r; assert(f); if (f->stdin_event_source) { r = sd_event_source_set_priority(f->stdin_event_source, priority); if (r < 0) return r; } r = sd_event_source_set_priority(f->stdout_event_source, priority); if (r < 0) return r; r = sd_event_source_set_priority(f->master_event_source, priority); if (r < 0) return r; r = sd_event_source_set_priority(f->sigwinch_event_source, priority); if (r < 0) return r; return 0; } int pty_forward_set_width_height(PTYForward *f, unsigned width, unsigned height) { struct winsize ws; assert(f); if (width == UINT_MAX && height == UINT_MAX) return 0; /* noop */ if (width != UINT_MAX && (width == 0 || width > USHRT_MAX)) return -ERANGE; if (height != UINT_MAX && (height == 0 || height > USHRT_MAX)) return -ERANGE; if (width == UINT_MAX || height == UINT_MAX) { if (ioctl(f->master, TIOCGWINSZ, &ws) < 0) return -errno; if (width != UINT_MAX) ws.ws_col = width; if (height != UINT_MAX) ws.ws_row = height; } else ws = (struct winsize) { .ws_row = height, .ws_col = width, }; if (ioctl(f->master, TIOCSWINSZ, &ws) < 0) return -errno; /* Make sure we ignore SIGWINCH window size events from now on */ f->sigwinch_event_source = sd_event_source_unref(f->sigwinch_event_source); return 0; } int pty_forward_set_background_color(PTYForward *f, const char *color) { assert(f); return free_and_strdup(&f->background_color, color); } int pty_forward_set_title(PTYForward *f, const char *title) { assert(f); /* Refuse accepting a title when we already started shoveling */ if (f->out_buffer_size > 0) return -EBUSY; return free_and_strdup(&f->title, title); } int pty_forward_set_titlef(PTYForward *f, const char *format, ...) { _cleanup_free_ char *title = NULL; va_list ap; int r; assert(f); assert(format); if (f->out_buffer_size > 0) return -EBUSY; va_start(ap, format); r = vasprintf(&title, format, ap); va_end(ap); if (r < 0) return -ENOMEM; return free_and_replace(f->title, title); } int pty_forward_set_title_prefix(PTYForward *f, const char *title_prefix) { assert(f); return free_and_strdup(&f->title_prefix, title_prefix); }