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Remove the -d flag to tmux and just use op/AX to detect default colours.

Irritatingly, although op can be used to tell if a terminal supports default
colours, it can't be used to set them because in some terminfo descriptions it
resets attributes as a side-effect (acts as sgr0) and in others it doesn't, so
it is not possible to determine reliably what the terminal state will be
afterwards. So if AX is missing and op is present, tmux just sends sgr0.

Anyone using -d for a terminal who finds they actually needed it can replace it
using terminal-overrides, but please let me know as it is probably an omission
from terminfo.

/* $OpenBSD: tmux.c,v 1.52 2009/10/25 21:11:21 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/stat.h>

#include <errno.h>
#include <paths.h>
#include <pwd.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>

#include "tmux.h"

#ifdef DEBUG
const char	*malloc_options = "AFGJPX";
#endif

volatile sig_atomic_t sigwinch;
volatile sig_atomic_t sigterm;
volatile sig_atomic_t sigcont;
volatile sig_atomic_t sigchld;
volatile sig_atomic_t sigusr1;
volatile sig_atomic_t sigusr2;

char		*cfg_file;
struct options	 global_s_options;	/* session options */
struct options	 global_w_options;	/* window options */
struct environ	 global_environ;

int		 debug_level;
int		 be_quiet;
time_t		 start_time;
char		*socket_path;
int		 login_shell;

__dead void	 usage(void);
void	 	 fill_session(struct msg_command_data *);
char 		*makesockpath(const char *);
int		 dispatch_imsg(struct imsgbuf *, const char *, int *);
__dead void	 shell_exec(const char *, const char *);

__dead void
usage(void)
{
	fprintf(stderr,
	    "usage: %s [-28lquv] [-c shell-command] [-f file] [-L socket-name]\n"
	    "            [-S socket-path] [command [flags]]\n",
	    __progname);
	exit(1);
}

void
logfile(const char *name)
{
	char	*path;

	log_close();
	if (debug_level > 0) {
		xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid());
		log_open_file(debug_level, path);
		xfree(path);
	}
}

void
sighandler(int sig)
{
	int	saved_errno;

	saved_errno = errno;
	switch (sig) {
	case SIGWINCH:
		sigwinch = 1;
		break;
	case SIGTERM:
		sigterm = 1;
		break;
	case SIGCHLD:
		sigchld = 1;
		break;
	case SIGCONT:
		sigcont = 1;
		break;
	case SIGUSR1:
		sigusr1 = 1;
		break;
	case SIGUSR2:
		sigusr2 = 1;
		break;
	}
	errno = saved_errno;
}

void
siginit(void)
{
	struct sigaction	 act;

	memset(&act, 0, sizeof act);
	sigemptyset(&act.sa_mask);
	act.sa_flags = SA_RESTART;

	act.sa_handler = SIG_IGN;
	if (sigaction(SIGPIPE, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGINT, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGTSTP, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGQUIT, &act, NULL) != 0)
		fatal("sigaction failed");

	act.sa_handler = sighandler;
	if (sigaction(SIGWINCH, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGTERM, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGCHLD, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGUSR1, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGUSR2, &act, NULL) != 0)
		fatal("sigaction failed");
}

void
sigreset(void)
{
	struct sigaction act;

	memset(&act, 0, sizeof act);
	sigemptyset(&act.sa_mask);

	act.sa_handler = SIG_DFL;
	if (sigaction(SIGPIPE, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGUSR1, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGUSR2, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGINT, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGTSTP, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGQUIT, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGWINCH, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGTERM, &act, NULL) != 0)
		fatal("sigaction failed");
	if (sigaction(SIGCHLD, &act, NULL) != 0)
		fatal("sigaction failed");
}

const char *
getshell(void)
{
	struct passwd	*pw;
	const char	*shell;

	shell = getenv("SHELL");
	if (checkshell(shell))
		return (shell);

	pw = getpwuid(getuid());
	if (pw != NULL && checkshell(pw->pw_shell))
		return (pw->pw_shell);

	return (_PATH_BSHELL);
}

int
checkshell(const char *shell)
{
	if (shell == NULL || *shell == '\0' || areshell(shell))
		return (0);
	if (access(shell, X_OK) != 0)
		return (0);
	return (1);
}

int
areshell(const char *shell)
{
	const char	*progname, *ptr;

	if ((ptr = strrchr(shell, '/')) != NULL)
		ptr++;
	else
		ptr = shell;
	progname = __progname;
	if (*progname == '-')
		progname++;
	if (strcmp(ptr, progname) == 0)
		return (1);
	return (0);
}

void
fill_session(struct msg_command_data *data)
{
	char		*env, *ptr1, *ptr2, buf[256];
	size_t		 len;
	const char	*errstr;
	long long	 ll;

	data->pid = -1;
	if ((env = getenv("TMUX")) == NULL)
		return;

	if ((ptr2 = strrchr(env, ',')) == NULL || ptr2 == env)
		return;
	for (ptr1 = ptr2 - 1; ptr1 > env && *ptr1 != ','; ptr1--)
		;
	if (*ptr1 != ',')
		return;
	ptr1++;
	ptr2++;

	len = ptr2 - ptr1 - 1;
	if (len > (sizeof buf) - 1)
		return;
	memcpy(buf, ptr1, len);
	buf[len] = '\0';

	ll = strtonum(buf, 0, LONG_MAX, &errstr);
	if (errstr != NULL)
		return;
	data->pid = ll;

	ll = strtonum(ptr2, 0, UINT_MAX, &errstr);
	if (errstr != NULL)
		return;
	data->idx = ll;
}

char *
makesockpath(const char *label)
{
	char		base[MAXPATHLEN], *path;
	struct stat	sb;
	u_int		uid;

	uid = getuid();
	xsnprintf(base, MAXPATHLEN, "%s/tmux-%d", _PATH_TMP, uid);

	if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
		return (NULL);

	if (lstat(base, &sb) != 0)
		return (NULL);
	if (!S_ISDIR(sb.st_mode)) {
		errno = ENOTDIR;
		return (NULL);
	}
	if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
		errno = EACCES;
		return (NULL);
	}

	xasprintf(&path, "%s/%s", base, label);
	return (path);
}

int
main(int argc, char **argv)
{
	struct cmd_list		*cmdlist;
 	struct cmd		*cmd;
	struct pollfd		 pfd;
	enum msgtype		 msg;
	struct passwd		*pw;
	struct options		*so, *wo;
	struct keylist		*keylist;
	struct imsgbuf		*ibuf;
	struct msg_command_data	 cmddata;
	char			*s, *shellcmd, *path, *label, *home, *cause;
	char			 cwd[MAXPATHLEN], **var;
	void			*buf;
	size_t			 len;
	int	 		 nfds, retcode, opt, flags, cmdflags = 0;

	flags = 0;
	shellcmd = label = path = NULL;
	login_shell = (**argv == '-');
	while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) {
		switch (opt) {
		case '2':
			flags |= IDENTIFY_256COLOURS;
			flags &= ~IDENTIFY_88COLOURS;
			break;
		case '8':
			flags |= IDENTIFY_88COLOURS;
			flags &= ~IDENTIFY_256COLOURS;
			break;
		case 'c':
			if (shellcmd != NULL)
				xfree(shellcmd);
			shellcmd = xstrdup(optarg);
			break;
		case 'f':
			if (cfg_file != NULL)
				xfree(cfg_file);
			cfg_file = xstrdup(optarg);
			break;
		case 'l':
			login_shell = 1;
			break;
		case 'L':
			if (label != NULL)
				xfree(label);
			label = xstrdup(optarg);
			break;
		case 'q':
			be_quiet = 1;
			break;
		case 'S':
			if (path != NULL)
				xfree(path);
			path = xstrdup(optarg);
			break;
		case 'u':
			flags |= IDENTIFY_UTF8;
			break;
		case 'v':
			debug_level++;
			break;
                default:
			usage();
                }
        }
	argc -= optind;
	argv += optind;

	if (shellcmd != NULL && argc != 0)
		usage();

	log_open_tty(debug_level);
	siginit();

	if (!(flags & IDENTIFY_UTF8)) {
		/*
		 * If the user has set whichever of LC_ALL, LC_CTYPE or LANG
		 * exist (in that order) to contain UTF-8, it is a safe
		 * assumption that either they are using a UTF-8 terminal, or
		 * if not they know that output from UTF-8-capable programs may
		 * be wrong.
		 */
		if ((s = getenv("LC_ALL")) == NULL) {
			if ((s = getenv("LC_CTYPE")) == NULL)
				s = getenv("LANG");
		}
		if (s != NULL && (strcasestr(s, "UTF-8") != NULL ||
		    strcasestr(s, "UTF8") != NULL))
			flags |= IDENTIFY_UTF8;
	}

	environ_init(&global_environ);
 	for (var = environ; *var != NULL; var++)
		environ_put(&global_environ, *var);

	options_init(&global_s_options, NULL);
	so = &global_s_options;
	options_set_number(so, "base-index", 0);
	options_set_number(so, "bell-action", BELL_ANY);
	options_set_number(so, "buffer-limit", 9);
	options_set_string(so, "default-command", "%s", "");
	options_set_string(so, "default-shell", "%s", getshell());
	options_set_string(so, "default-terminal", "screen");
	options_set_number(so, "display-panes-colour", 4);
	options_set_number(so, "display-panes-time", 1000);
	options_set_number(so, "display-time", 750);
	options_set_number(so, "history-limit", 2000);
	options_set_number(so, "lock-after-time", 0);
	options_set_string(so, "lock-command", "lock -np");
	options_set_number(so, "lock-server", 1);
	options_set_number(so, "message-attr", 0);
	options_set_number(so, "message-bg", 3);
	options_set_number(so, "message-fg", 0);
	options_set_number(so, "mouse-select-pane", 0);
	options_set_number(so, "repeat-time", 500);
	options_set_number(so, "set-remain-on-exit", 0);
	options_set_number(so, "set-titles", 0);
	options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\"");
	options_set_number(so, "status", 1);
	options_set_number(so, "status-attr", 0);
	options_set_number(so, "status-bg", 2);
	options_set_number(so, "status-fg", 0);
	options_set_number(so, "status-interval", 15);
	options_set_number(so, "status-justify", 0);
	options_set_number(so, "status-keys", MODEKEY_EMACS);
	options_set_string(so, "status-left", "[#S]");
	options_set_number(so, "status-left-attr", 0);
	options_set_number(so, "status-left-bg", 8);
	options_set_number(so, "status-left-fg", 8);
	options_set_number(so, "status-left-length", 10);
	options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y");
	options_set_number(so, "status-right-attr", 0);
	options_set_number(so, "status-right-bg", 8);
	options_set_number(so, "status-right-fg", 8);
	options_set_number(so, "status-right-length", 40);
	options_set_string(so, "terminal-overrides",
	    "*88col*:colors=88,*256col*:colors=256");
	options_set_string(so, "update-environment", "DISPLAY "
	    "WINDOWID SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION");
	options_set_number(so, "visual-activity", 0);
	options_set_number(so, "visual-bell", 0);
	options_set_number(so, "visual-content", 0);

	keylist = xmalloc(sizeof *keylist);
	ARRAY_INIT(keylist);
	ARRAY_ADD(keylist, '\002');
	options_set_data(so, "prefix", keylist, xfree);

	options_init(&global_w_options, NULL);
	wo = &global_w_options;
	options_set_number(wo, "aggressive-resize", 0);
	options_set_number(wo, "automatic-rename", 1);
	options_set_number(wo, "clock-mode-colour", 4);
	options_set_number(wo, "clock-mode-style", 1);
	options_set_number(wo, "force-height", 0);
	options_set_number(wo, "force-width", 0);
	options_set_number(wo, "main-pane-height", 24);
	options_set_number(wo, "main-pane-width", 81);
	options_set_number(wo, "mode-attr", 0);
	options_set_number(wo, "mode-bg", 3);
	options_set_number(wo, "mode-fg", 0);
	options_set_number(wo, "mode-keys", MODEKEY_EMACS);
	options_set_number(wo, "mode-mouse", 0);
	options_set_number(wo, "monitor-activity", 0);
	options_set_string(wo, "monitor-content", "%s", "");
	options_set_number(wo, "window-status-attr", 0);
	options_set_number(wo, "window-status-bg", 8);
	options_set_number(wo, "window-status-current-attr", 0);
	options_set_number(wo, "window-status-current-bg", 8);
	options_set_number(wo, "window-status-current-fg", 8);
	options_set_number(wo, "window-status-fg", 8);
	options_set_number(wo, "xterm-keys", 0);
 	options_set_number(wo, "remain-on-exit", 0);
	options_set_number(wo, "synchronize-panes", 0);

 	if (flags & IDENTIFY_UTF8) {
		options_set_number(so, "status-utf8", 1);
		options_set_number(wo, "utf8", 1);
	} else {
		options_set_number(so, "status-utf8", 0);
		options_set_number(wo, "utf8", 0);
	}

	if (getcwd(cwd, sizeof cwd) == NULL) {
		pw = getpwuid(getuid());
		if (pw->pw_dir != NULL && *pw->pw_dir != '\0')
			strlcpy(cwd, pw->pw_dir, sizeof cwd);
		else
			strlcpy(cwd, "/", sizeof cwd);
	}
	options_set_string(so, "default-path", "%s", cwd);

	if (cfg_file == NULL) {
		home = getenv("HOME");
		if (home == NULL || *home == '\0') {
			pw = getpwuid(getuid());
			if (pw != NULL)
				home = pw->pw_dir;
		}
		xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
		if (access(cfg_file, R_OK) != 0) {
			xfree(cfg_file);
			cfg_file = NULL;
		}
	} else {
		if (access(cfg_file, R_OK) != 0) {
			log_warn("%s", cfg_file);
			exit(1);
		}
	}
	
	if (label == NULL)
		label = xstrdup("default");
	if (path == NULL && (path = makesockpath(label)) == NULL) {
		log_warn("can't create socket");
		exit(1);
	}
	xfree(label);

	if (shellcmd != NULL) {
		msg = MSG_SHELL;
		buf = NULL;
		len = 0;
	} else {
		fill_session(&cmddata);
	
		cmddata.argc = argc;
		if (cmd_pack_argv(
		    argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) {
			log_warnx("command too long");
			exit(1);
		}
		
		msg = MSG_COMMAND;
		buf = &cmddata;
		len = sizeof cmddata;
	}

	if (shellcmd != NULL)
		cmdflags |= CMD_STARTSERVER;
	else if (argc == 0)	/* new-session is the default */
		cmdflags |= CMD_STARTSERVER|CMD_SENDENVIRON;
	else {
		/*
		 * It sucks parsing the command string twice (in client and
		 * later in server) but it is necessary to get the start server
		 * flag.
		 */
		if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
			log_warnx("%s", cause);
			exit(1);
		}
		cmdflags &= ~CMD_STARTSERVER;
		TAILQ_FOREACH(cmd, cmdlist, qentry) {
			if (cmd->entry->flags & CMD_STARTSERVER)
				cmdflags |= CMD_STARTSERVER;
			if (cmd->entry->flags & CMD_SENDENVIRON)
				cmdflags |= CMD_SENDENVIRON;
		}
		cmd_list_free(cmdlist);
	}

	if ((ibuf = client_init(path, cmdflags, flags)) == NULL)
		exit(1);
	xfree(path);

 	imsg_compose(ibuf, msg, PROTOCOL_VERSION, -1, -1, buf, len);

	retcode = 0;
	for (;;) {
		pfd.fd = ibuf->fd;
		pfd.events = POLLIN;
		if (ibuf->w.queued != 0)
			pfd.events |= POLLOUT;

		if ((nfds = poll(&pfd, 1, INFTIM)) == -1) {
			if (errno == EAGAIN || errno == EINTR)
				continue;
			fatal("poll failed");
		}
		if (nfds == 0)
			continue;

		if (pfd.revents & (POLLERR|POLLHUP|POLLNVAL))
			fatalx("socket error");

                if (pfd.revents & POLLIN) {
			if (dispatch_imsg(ibuf, shellcmd, &retcode) != 0)
				break;
		}

		if (pfd.revents & POLLOUT) {
			if (msgbuf_write(&ibuf->w) < 0)
				fatalx("msgbuf_write failed");
		}
	}

	options_free(&global_s_options);
	options_free(&global_w_options);

	return (retcode);
}

int
dispatch_imsg(struct imsgbuf *ibuf, const char *shellcmd, int *retcode)
{
	struct imsg		imsg;
	ssize_t			n, datalen;
	struct msg_print_data	printdata;
	struct msg_shell_data	shelldata;

        if ((n = imsg_read(ibuf)) == -1 || n == 0)
		fatalx("imsg_read failed");

	for (;;) {
		if ((n = imsg_get(ibuf, &imsg)) == -1)
			fatalx("imsg_get failed");
		if (n == 0)
			return (0);
		datalen = imsg.hdr.len - IMSG_HEADER_SIZE;

		switch (imsg.hdr.type) {
		case MSG_EXIT:
		case MSG_SHUTDOWN:
			if (datalen != 0)
				fatalx("bad MSG_EXIT size");

			return (-1);
		case MSG_ERROR:
			*retcode = 1;
			/* FALLTHROUGH */
		case MSG_PRINT:
			if (datalen != sizeof printdata)
				fatalx("bad MSG_PRINT size");
			memcpy(&printdata, imsg.data, sizeof printdata);
			printdata.msg[(sizeof printdata.msg) - 1] = '\0';

			log_info("%s", printdata.msg);
			break;
		case MSG_READY:
			if (datalen != 0)
				fatalx("bad MSG_READY size");

			client_main();	/* doesn't return */
		case MSG_VERSION:
			if (datalen != 0)
				fatalx("bad MSG_VERSION size");

			log_warnx("protocol version mismatch (client %u, "
			    "server %u)", PROTOCOL_VERSION, imsg.hdr.peerid);
			*retcode = 1;
			return (-1);
		case MSG_SHELL:
			if (datalen != sizeof shelldata)
				fatalx("bad MSG_SHELL size");
			memcpy(&shelldata, imsg.data, sizeof shelldata);
			shelldata.shell[(sizeof shelldata.shell) - 1] = '\0';
			
			shell_exec(shelldata.shell, shellcmd);
		default:
			fatalx("unexpected message");
		}

		imsg_free(&imsg);
	}
}

__dead void
shell_exec(const char *shell, const char *shellcmd)
{
	const char	*shellname, *ptr;
	char		*argv0;

	sigreset();
				
	ptr = strrchr(shell, '/');
	if (ptr != NULL && *(ptr + 1) != '\0')
		shellname = ptr + 1;
	else
		shellname = shell;
	if (login_shell)
		xasprintf(&argv0, "-%s", shellname);
	else
		xasprintf(&argv0, "%s", shellname);
	setenv("SHELL", shell, 1);

	execl(shell, argv0, "-c", shellcmd, (char *) NULL);
	fatal("execl failed");
}