/* * Pseudo-tty backend for pterm. */ #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "putty.h" #include "tree234.h" #ifndef OMIT_UTMP #include #endif #ifndef FALSE #define FALSE 0 #endif #ifndef TRUE #define TRUE 1 #endif /* updwtmpx() needs the name of the wtmp file. Try to find it. */ #ifndef WTMPX_FILE #ifdef _PATH_WTMPX #define WTMPX_FILE _PATH_WTMPX #else #define WTMPX_FILE "/var/log/wtmpx" #endif #endif #ifndef LASTLOG_FILE #ifdef _PATH_LASTLOG #define LASTLOG_FILE _PATH_LASTLOG #else #define LASTLOG_FILE "/var/log/lastlog" #endif #endif /* * Set up a default for vaguely sane systems. The idea is that if * OMIT_UTMP is not defined, then at least one of the symbols which * enable particular forms of utmp processing should be, if only so * that a link error can warn you that you should have defined * OMIT_UTMP if you didn't want any. Currently HAVE_PUTUTLINE is * the only such symbol. */ #ifndef OMIT_UTMP #if !defined HAVE_PUTUTLINE #define HAVE_PUTUTLINE #endif #endif typedef struct pty_tag *Pty; /* * The pty_signal_pipe, along with the SIGCHLD handler, must be * process-global rather than session-specific. */ static int pty_signal_pipe[2] = { -1, -1 }; /* obviously bogus initial val */ struct pty_tag { Config cfg; int master_fd, slave_fd; void *frontend; char name[FILENAME_MAX]; pid_t child_pid; int term_width, term_height; int child_dead, finished; int exit_code; bufchain output_data; }; /* * We store our pty backends in a tree sorted by master fd, so that * when we get an uxsel notification we know which backend instance * is the owner of the pty that caused it. */ static int pty_compare_by_fd(void *av, void *bv) { Pty a = (Pty)av; Pty b = (Pty)bv; if (a->master_fd < b->master_fd) return -1; else if (a->master_fd > b->master_fd) return +1; return 0; } static int pty_find_by_fd(void *av, void *bv) { int a = *(int *)av; Pty b = (Pty)bv; if (a < b->master_fd) return -1; else if (a > b->master_fd) return +1; return 0; } static tree234 *ptys_by_fd = NULL; /* * We also have a tree sorted by child pid, so that when we wait() * in response to the signal we know which backend instance is the * owner of the process that caused the signal. */ static int pty_compare_by_pid(void *av, void *bv) { Pty a = (Pty)av; Pty b = (Pty)bv; if (a->child_pid < b->child_pid) return -1; else if (a->child_pid > b->child_pid) return +1; return 0; } static int pty_find_by_pid(void *av, void *bv) { pid_t a = *(pid_t *)av; Pty b = (Pty)bv; if (a < b->child_pid) return -1; else if (a > b->child_pid) return +1; return 0; } static tree234 *ptys_by_pid = NULL; /* * If we are using pty_pre_init(), it will need to have already * allocated a pty structure, which we must then return from * pty_init() rather than allocating a new one. Here we store that * structure between allocation and use. * * Note that although most of this module is entirely capable of * handling multiple ptys in a single process, pty_pre_init() is * fundamentally _dependent_ on there being at most one pty per * process, so the normal static-data constraints don't apply. * * Likewise, since utmp is only used via pty_pre_init, it too must * be single-instance, so we can declare utmp-related variables * here. */ static Pty single_pty = NULL; #ifndef OMIT_UTMP static pid_t pty_utmp_helper_pid; static int pty_utmp_helper_pipe; static int pty_stamped_utmp; static struct utmpx utmp_entry; #endif /* * pty_argv is a grievous hack to allow a proper argv to be passed * through from the Unix command line. Again, it doesn't really * make sense outside a one-pty-per-process setup. */ char **pty_argv; static void pty_close(Pty pty); static void pty_try_write(Pty pty); #ifndef OMIT_UTMP static void setup_utmp(char *ttyname, char *location) { #ifdef HAVE_LASTLOG struct lastlog lastlog_entry; FILE *lastlog; #endif struct passwd *pw; struct timeval tv; pw = getpwuid(getuid()); memset(&utmp_entry, 0, sizeof(utmp_entry)); utmp_entry.ut_type = USER_PROCESS; utmp_entry.ut_pid = getpid(); strncpy(utmp_entry.ut_line, ttyname+5, lenof(utmp_entry.ut_line)); strncpy(utmp_entry.ut_id, ttyname+8, lenof(utmp_entry.ut_id)); strncpy(utmp_entry.ut_user, pw->pw_name, lenof(utmp_entry.ut_user)); strncpy(utmp_entry.ut_host, location, lenof(utmp_entry.ut_host)); /* * Apparently there are some architectures where (struct * utmpx).ut_tv is not essentially struct timeval (e.g. Linux * amd64). Hence the temporary. */ gettimeofday(&tv, NULL); utmp_entry.ut_tv.tv_sec = tv.tv_sec; utmp_entry.ut_tv.tv_usec = tv.tv_usec; setutxent(); pututxline(&utmp_entry); endutxent(); updwtmpx(WTMPX_FILE, &utmp_entry); #ifdef HAVE_LASTLOG memset(&lastlog_entry, 0, sizeof(lastlog_entry)); strncpy(lastlog_entry.ll_line, ttyname+5, lenof(lastlog_entry.ll_line)); strncpy(lastlog_entry.ll_host, location, lenof(lastlog_entry.ll_host)); time(&lastlog_entry.ll_time); if ((lastlog = fopen(LASTLOG_FILE, "r+")) != NULL) { fseek(lastlog, sizeof(lastlog_entry) * getuid(), SEEK_SET); fwrite(&lastlog_entry, 1, sizeof(lastlog_entry), lastlog); fclose(lastlog); } #endif pty_stamped_utmp = 1; } static void cleanup_utmp(void) { struct timeval tv; if (!pty_stamped_utmp) return; utmp_entry.ut_type = DEAD_PROCESS; memset(utmp_entry.ut_user, 0, lenof(utmp_entry.ut_user)); gettimeofday(&tv, NULL); utmp_entry.ut_tv.tv_sec = tv.tv_sec; utmp_entry.ut_tv.tv_usec = tv.tv_usec; updwtmpx(WTMPX_FILE, &utmp_entry); memset(utmp_entry.ut_line, 0, lenof(utmp_entry.ut_line)); utmp_entry.ut_tv.tv_sec = 0; utmp_entry.ut_tv.tv_usec = 0; setutxent(); pututxline(&utmp_entry); endutxent(); pty_stamped_utmp = 0; /* ensure we never double-cleanup */ } #endif static void sigchld_handler(int signum) { if (write(pty_signal_pipe[1], "x", 1) <= 0) /* not much we can do about it */; } #ifndef OMIT_UTMP static void fatal_sig_handler(int signum) { putty_signal(signum, SIG_DFL); cleanup_utmp(); setuid(getuid()); raise(signum); } #endif static int pty_open_slave(Pty pty) { if (pty->slave_fd < 0) { pty->slave_fd = open(pty->name, O_RDWR); cloexec(pty->slave_fd); } return pty->slave_fd; } static void pty_open_master(Pty pty) { #ifdef BSD_PTYS const char chars1[] = "pqrstuvwxyz"; const char chars2[] = "0123456789abcdef"; const char *p1, *p2; char master_name[20]; struct group *gp; for (p1 = chars1; *p1; p1++) for (p2 = chars2; *p2; p2++) { sprintf(master_name, "/dev/pty%c%c", *p1, *p2); pty->master_fd = open(master_name, O_RDWR); if (pty->master_fd >= 0) { if (geteuid() == 0 || access(master_name, R_OK | W_OK) == 0) { /* * We must also check at this point that we are * able to open the slave side of the pty. We * wouldn't want to allocate the wrong master, * get all the way down to forking, and _then_ * find we're unable to open the slave. */ strcpy(pty->name, master_name); pty->name[5] = 't'; /* /dev/ptyXX -> /dev/ttyXX */ cloexec(pty->master_fd); if (pty_open_slave(pty) >= 0 && access(pty->name, R_OK | W_OK) == 0) goto got_one; if (pty->slave_fd > 0) close(pty->slave_fd); pty->slave_fd = -1; } close(pty->master_fd); } } /* If we get here, we couldn't get a tty at all. */ fprintf(stderr, "pterm: unable to open a pseudo-terminal device\n"); exit(1); got_one: /* We need to chown/chmod the /dev/ttyXX device. */ gp = getgrnam("tty"); chown(pty->name, getuid(), gp ? gp->gr_gid : -1); chmod(pty->name, 0600); #else pty->master_fd = open("/dev/ptmx", O_RDWR); if (pty->master_fd < 0) { perror("/dev/ptmx: open"); exit(1); } if (grantpt(pty->master_fd) < 0) { perror("grantpt"); exit(1); } if (unlockpt(pty->master_fd) < 0) { perror("unlockpt"); exit(1); } cloexec(pty->master_fd); pty->name[FILENAME_MAX-1] = '\0'; strncpy(pty->name, ptsname(pty->master_fd), FILENAME_MAX-1); #endif { /* * Set the pty master into non-blocking mode. */ int fl; fl = fcntl(pty->master_fd, F_GETFL); if (fl != -1 && !(fl & O_NONBLOCK)) fcntl(pty->master_fd, F_SETFL, fl | O_NONBLOCK); } if (!ptys_by_fd) ptys_by_fd = newtree234(pty_compare_by_fd); add234(ptys_by_fd, pty); } /* * Pre-initialisation. This is here to get around the fact that GTK * doesn't like being run in setuid/setgid programs (probably * sensibly). So before we initialise GTK - and therefore before we * even process the command line - we check to see if we're running * set[ug]id. If so, we open our pty master _now_, chown it as * necessary, and drop privileges. We can always close it again * later. If we're potentially going to be doing utmp as well, we * also fork off a utmp helper process and communicate with it by * means of a pipe; the utmp helper will keep privileges in order * to clean up utmp when we exit (i.e. when its end of our pipe * closes). */ void pty_pre_init(void) { Pty pty; #ifndef OMIT_UTMP pid_t pid; int pipefd[2]; #endif pty = single_pty = snew(struct pty_tag); bufchain_init(&pty->output_data); /* set the child signal handler straight away; it needs to be set * before we ever fork. */ putty_signal(SIGCHLD, sigchld_handler); pty->master_fd = pty->slave_fd = -1; #ifndef OMIT_UTMP pty_stamped_utmp = FALSE; #endif if (geteuid() != getuid() || getegid() != getgid()) { pty_open_master(pty); } #ifndef OMIT_UTMP /* * Fork off the utmp helper. */ if (pipe(pipefd) < 0) { perror("pterm: pipe"); exit(1); } cloexec(pipefd[0]); cloexec(pipefd[1]); pid = fork(); if (pid < 0) { perror("pterm: fork"); exit(1); } else if (pid == 0) { char display[128], buffer[128]; int dlen, ret; close(pipefd[1]); /* * Now sit here until we receive a display name from the * other end of the pipe, and then stamp utmp. Unstamp utmp * again, and exit, when the pipe closes. */ dlen = 0; while (1) { ret = read(pipefd[0], buffer, lenof(buffer)); if (ret <= 0) { cleanup_utmp(); _exit(0); } else if (!pty_stamped_utmp) { if (dlen < lenof(display)) memcpy(display+dlen, buffer, min(ret, lenof(display)-dlen)); if (buffer[ret-1] == '\0') { /* * Now we have a display name. NUL-terminate * it, and stamp utmp. */ display[lenof(display)-1] = '\0'; /* * Trap as many fatal signals as we can in the * hope of having the best possible chance to * clean up utmp before termination. We are * unfortunately unprotected against SIGKILL, * but that's life. */ putty_signal(SIGHUP, fatal_sig_handler); putty_signal(SIGINT, fatal_sig_handler); putty_signal(SIGQUIT, fatal_sig_handler); putty_signal(SIGILL, fatal_sig_handler); putty_signal(SIGABRT, fatal_sig_handler); putty_signal(SIGFPE, fatal_sig_handler); putty_signal(SIGPIPE, fatal_sig_handler); putty_signal(SIGALRM, fatal_sig_handler); putty_signal(SIGTERM, fatal_sig_handler); putty_signal(SIGSEGV, fatal_sig_handler); putty_signal(SIGUSR1, fatal_sig_handler); putty_signal(SIGUSR2, fatal_sig_handler); #ifdef SIGBUS putty_signal(SIGBUS, fatal_sig_handler); #endif #ifdef SIGPOLL putty_signal(SIGPOLL, fatal_sig_handler); #endif #ifdef SIGPROF putty_signal(SIGPROF, fatal_sig_handler); #endif #ifdef SIGSYS putty_signal(SIGSYS, fatal_sig_handler); #endif #ifdef SIGTRAP putty_signal(SIGTRAP, fatal_sig_handler); #endif #ifdef SIGVTALRM putty_signal(SIGVTALRM, fatal_sig_handler); #endif #ifdef SIGXCPU putty_signal(SIGXCPU, fatal_sig_handler); #endif #ifdef SIGXFSZ putty_signal(SIGXFSZ, fatal_sig_handler); #endif #ifdef SIGIO putty_signal(SIGIO, fatal_sig_handler); #endif setup_utmp(pty->name, display); } } } } else { close(pipefd[0]); pty_utmp_helper_pid = pid; pty_utmp_helper_pipe = pipefd[1]; } #endif /* Drop privs. */ { #ifndef HAVE_NO_SETRESUID int gid = getgid(), uid = getuid(); int setresgid(gid_t, gid_t, gid_t); int setresuid(uid_t, uid_t, uid_t); setresgid(gid, gid, gid); setresuid(uid, uid, uid); #else setgid(getgid()); setuid(getuid()); #endif } } int pty_real_select_result(Pty pty, int event, int status) { char buf[4096]; int ret; int finished = FALSE; if (event < 0) { /* * We've been called because our child process did * something. `status' tells us what. */ if ((WIFEXITED(status) || WIFSIGNALED(status))) { /* * The primary child process died. We could keep * the terminal open for remaining subprocesses to * output to, but conventional wisdom seems to feel * that that's the Wrong Thing for an xterm-alike, * so we bail out now (though we don't necessarily * _close_ the window, depending on the state of * Close On Exit). This would be easy enough to * change or make configurable if necessary. */ pty->exit_code = status; pty->child_dead = TRUE; del234(ptys_by_pid, pty); finished = TRUE; } } else { if (event == 1) { ret = read(pty->master_fd, buf, sizeof(buf)); /* * Clean termination condition is that either ret == 0, or ret * < 0 and errno == EIO. Not sure why the latter, but it seems * to happen. Boo. */ if (ret == 0 || (ret < 0 && errno == EIO)) { /* * We assume a clean exit if the pty has closed but the * actual child process hasn't. The only way I can * imagine this happening is if it detaches itself from * the pty and goes daemonic - in which case the * expected usage model would precisely _not_ be for * the pterm window to hang around! */ finished = TRUE; if (!pty->child_dead) pty->exit_code = 0; } else if (ret < 0) { perror("read pty master"); exit(1); } else if (ret > 0) { from_backend(pty->frontend, 0, buf, ret); } } else if (event == 2) { /* * Attempt to send data down the pty. */ pty_try_write(pty); } } if (finished && !pty->finished) { uxsel_del(pty->master_fd); pty_close(pty); pty->master_fd = -1; pty->finished = TRUE; /* * This is a slight layering-violation sort of hack: only * if we're not closing on exit (COE is set to Never, or to * Only On Clean and it wasn't a clean exit) do we output a * `terminated' message. */ if (pty->cfg.close_on_exit == FORCE_OFF || (pty->cfg.close_on_exit == AUTO && pty->exit_code != 0)) { char message[512]; if (WIFEXITED(pty->exit_code)) sprintf(message, "\r\n[pterm: process terminated with exit" " code %d]\r\n", WEXITSTATUS(pty->exit_code)); else if (WIFSIGNALED(pty->exit_code)) #ifdef HAVE_NO_STRSIGNAL sprintf(message, "\r\n[pterm: process terminated on signal" " %d]\r\n", WTERMSIG(pty->exit_code)); #else sprintf(message, "\r\n[pterm: process terminated on signal" " %d (%.400s)]\r\n", WTERMSIG(pty->exit_code), strsignal(WTERMSIG(pty->exit_code))); #endif from_backend(pty->frontend, 0, message, strlen(message)); } notify_remote_exit(pty->frontend); } return !finished; } int pty_select_result(int fd, int event) { int ret = TRUE; Pty pty; if (fd == pty_signal_pipe[0]) { pid_t pid; int status; char c[1]; if (read(pty_signal_pipe[0], c, 1) <= 0) /* ignore error */; /* ignore its value; it'll be `x' */ do { pid = waitpid(-1, &status, WNOHANG); pty = find234(ptys_by_pid, &pid, pty_find_by_pid); if (pty) ret = ret && pty_real_select_result(pty, -1, status); } while (pid > 0); } else { pty = find234(ptys_by_fd, &fd, pty_find_by_fd); if (pty) ret = ret && pty_real_select_result(pty, event, 0); } return ret; } static void pty_uxsel_setup(Pty pty) { int rwx; rwx = 1; /* always want to read from pty */ if (bufchain_size(&pty->output_data)) rwx |= 2; /* might also want to write to it */ uxsel_set(pty->master_fd, rwx, pty_select_result); /* * In principle this only needs calling once for all pty * backend instances, but it's simplest just to call it every * time; uxsel won't mind. */ uxsel_set(pty_signal_pipe[0], 1, pty_select_result); } /* * Called to set up the pty. * * Returns an error message, or NULL on success. * * Also places the canonical host name into `realhost'. It must be * freed by the caller. */ static const char *pty_init(void *frontend, void **backend_handle, Config *cfg, char *host, int port, char **realhost, int nodelay, int keepalive) { int slavefd; pid_t pid, pgrp; #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */ long windowid; #endif Pty pty; if (single_pty) { pty = single_pty; } else { pty = snew(struct pty_tag); pty->master_fd = pty->slave_fd = -1; #ifndef OMIT_UTMP pty_stamped_utmp = FALSE; #endif } pty->frontend = frontend; *backend_handle = NULL; /* we can't sensibly use this, sadly */ pty->cfg = *cfg; /* structure copy */ pty->term_width = cfg->width; pty->term_height = cfg->height; if (pty->master_fd < 0) pty_open_master(pty); /* * Set the backspace character to be whichever of ^H and ^? is * 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); } #ifndef OMIT_UTMP /* * 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; } } #endif #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */ windowid = get_windowid(pty->frontend); #endif /* * Fork and execute the command. */ pid = fork(); if (pid < 0) { perror("fork"); exit(1); } if (pid == 0) { /* * We are the child. */ slavefd = pty_open_slave(pty); 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); close(slavefd); setsid(); #ifdef TIOCSCTTY ioctl(0, TIOCSCTTY, 1); #endif pgrp = getpid(); tcsetpgrp(0, pgrp); setpgid(pgrp, pgrp); close(open(pty->name, O_WRONLY, 0)); setpgid(pgrp, pgrp); { char *term_env_var = dupprintf("TERM=%s", cfg->termtype); putenv(term_env_var); /* We mustn't free term_env_var, as putenv links it into the * environment in place. */ } #ifndef NOT_X_WINDOWS /* for Mac OS X native compilation */ { char *windowid_env_var = dupprintf("WINDOWID=%ld", windowid); putenv(windowid_env_var); /* We mustn't free windowid_env_var, as putenv links it into the * environment in place. */ } #endif { char *e = cfg->environmt; char *var, *varend, *val, *varval; while (*e) { var = e; while (*e && *e != '\t') e++; varend = e; if (*e == '\t') e++; val = e; while (*e) e++; e++; varval = dupprintf("%.*s=%s", varend-var, var, val); putenv(varval); /* * We must not free varval, since putenv links it * into the environment _in place_. Weird, but * there we go. Memory usage will be rationalised * as soon as we exec anyway. */ } } /* * SIGINT, SIGQUIT and SIGPIPE may have been set to ignored by * our parent, particularly by things like sh -c 'pterm &' and * some window or session managers. SIGCHLD, meanwhile, was * blocked during pt_main() startup. Reverse all this for our * child process. */ putty_signal(SIGINT, SIG_DFL); putty_signal(SIGQUIT, SIG_DFL); putty_signal(SIGPIPE, SIG_DFL); block_signal(SIGCHLD, 0); 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, (void *)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 (pty->slave_fd > 0) close(pty->slave_fd); if (!ptys_by_pid) ptys_by_pid = newtree234(pty_compare_by_pid); add234(ptys_by_pid, pty); } if (pty_signal_pipe[0] < 0) { if (pipe(pty_signal_pipe) < 0) { perror("pipe"); exit(1); } cloexec(pty_signal_pipe[0]); cloexec(pty_signal_pipe[1]); } pty_uxsel_setup(pty); *backend_handle = pty; *realhost = dupprintf("\0"); return NULL; } static void pty_reconfig(void *handle, Config *cfg) { Pty pty = (Pty)handle; /* * 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) { Pty pty = (Pty)handle; /* Either of these may fail `not found'. That's fine with us. */ del234(ptys_by_pid, pty); del234(ptys_by_fd, pty); sfree(pty); } static void pty_try_write(Pty pty) { void *data; int len, ret; assert(pty->master_fd >= 0); while (bufchain_size(&pty->output_data) > 0) { bufchain_prefix(&pty->output_data, &data, &len); ret = write(pty->master_fd, data, len); if (ret < 0 && (errno == EWOULDBLOCK)) { /* * We've sent all we can for the moment. */ break; } if (ret < 0) { perror("write pty master"); exit(1); } bufchain_consume(&pty->output_data, ret); } pty_uxsel_setup(pty); } /* * Called to send data down the pty. */ static int pty_send(void *handle, char *buf, int len) { Pty pty = (Pty)handle; if (pty->master_fd < 0) return 0; /* ignore all writes if fd closed */ bufchain_add(&pty->output_data, buf, len); pty_try_write(pty); return bufchain_size(&pty->output_data); } static void pty_close(Pty pty) { if (pty->master_fd >= 0) { close(pty->master_fd); pty->master_fd = -1; } #ifndef OMIT_UTMP if (pty_utmp_helper_pipe >= 0) { close(pty_utmp_helper_pipe); /* this causes utmp to be cleaned up */ pty_utmp_helper_pipe = -1; } #endif } /* * Called to query the current socket sendability status. */ static int pty_sendbuffer(void *handle) { /* Pty pty = (Pty)handle; */ return 0; } /* * Called to set the size of the window */ static void pty_size(void *handle, int width, int height) { Pty pty = (Pty)handle; 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) { /* Pty pty = (Pty)handle; */ /* 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) { /* Pty pty = (Pty)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 int pty_connected(void *handle) { /* Pty pty = (Pty)handle; */ return TRUE; } static int pty_sendok(void *handle) { /* Pty pty = (Pty)handle; */ return 1; } static void pty_unthrottle(void *handle, int backlog) { /* Pty pty = (Pty)handle; */ /* do nothing */ } static int pty_ldisc(void *handle, int option) { /* Pty pty = (Pty)handle; */ return 0; /* neither editing nor echoing */ } static void pty_provide_ldisc(void *handle, void *ldisc) { /* Pty pty = (Pty)handle; */ /* This is a stub. */ } static void pty_provide_logctx(void *handle, void *logctx) { /* Pty pty = (Pty)handle; */ /* This is a stub. */ } static int pty_exitcode(void *handle) { Pty pty = (Pty)handle; if (!pty->finished) return -1; /* not dead yet */ else return pty->exit_code; } static int pty_cfg_info(void *handle) { /* Pty pty = (Pty)handle; */ return 0; } Backend pty_backend = { pty_init, pty_free, pty_reconfig, pty_send, pty_sendbuffer, pty_size, pty_special, pty_get_specials, pty_connected, pty_exitcode, pty_sendok, pty_ldisc, pty_provide_ldisc, pty_provide_logctx, pty_unthrottle, pty_cfg_info, "pty", -1, 0 };