/* $OpenBSD: cmd-new-session.c,v 1.155 2026/10/16 17:28:19 nicm Exp $ */

/*

 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>

 *

 * 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 <errno.h>

#include <fcntl.h>

#include <stdlib.h>

#include <string.h>

#include <termios.h>

#include <unistd.h>

#include "tmux.h"

/*

 * Create a new session and attach to the current terminal unless -d is given.

 */

#define NEW_SESSION_TEMPLATE "#{session_name}:"

static enum cmd_retval  cmd_new_session_exec(struct cmd *, struct cmdq_item *);

const struct cmd_entry cmd_new_session_entry = {

  .name = "new-session",

  .description = "Create a new session.",

  .alias = "new",

  .args = { "Ac:dDe:EF:f:n:Ps:t:x:Xy:", 0, -1, NULL },

  .usage = "[-AdDEPX] [-c start-directory] [-e environment] [-F format] "

     "[-f flags] [-n window-name] [-s session-name] "

     CMD_TARGET_SESSION_USAGE " [-x width] [-y height] "

     "[shell-command [argument ...]]",

  .target = { 't', CMD_FIND_SESSION, CMD_FIND_CANFAIL },

  .flags = CMD_STARTSERVER,

  .exec = cmd_new_session_exec

};

const struct cmd_entry cmd_has_session_entry = {

  .name = "has-session",

  .description = "Check whether a session exists.",

  .alias = "has",

  .args = { "t:", 0, 0, NULL },

  .usage = CMD_TARGET_SESSION_USAGE,

  .target = { 't', CMD_FIND_SESSION, 0 },

  .flags = 0,

  .exec = cmd_new_session_exec

};

static enum cmd_retval

cmd_new_session_exec(struct cmd *self, struct cmdq_item *item)

{

  struct args   *args = cmd_get_args(self);

  struct cmd_find_state *current = cmdq_get_current(item);

  struct cmd_find_state *target = cmdq_get_target(item);

  struct client   *c = cmdq_get_client(item);

  struct session    *s, *as, *groupwith = NULL;

  struct environ    *env;

  struct options    *oo;

  struct termios     tio, *tiop;

  struct session_group  *sg = NULL;

  const char    *errstr, *template, *group, *tmp;

  char      *cause, *cwd = NULL, *cp, *ename;

  char      *wname = NULL, *sname = NULL, *prefix = NULL;

  int      detached, already_attached, is_control = 0;

  u_int      sx, sy, dsx, dsy, idx;

  u_int      count = args_count(args);

  struct spawn_context   sc = { 0 };

  enum cmd_retval    retval;

  struct cmd_find_state    fs;

  struct args_value *av;

  if (cmd_get_entry(self) == &cmd_has_session_entry) {

    /*

     * cmd_find_target() will fail if the session cannot be found,

     * so always return success here.

     */

    return (CMD_RETURN_NORMAL);

  }

  if (args_has(args, 't') && (count != 0 || args_has(args, 'n'))) {

    cmdq_error(item, "command or window name given with target");

    return (CMD_RETURN_ERROR);

  }

  if ((tmp = args_get(args, 'n')) != NULL) {

    ename = format_single(item, tmp, c, NULL, NULL, NULL);

    if (!check_name(ename)) {

      cmdq_error(item, "invalid window name: %s", ename);

      free(ename);

      return (CMD_RETURN_ERROR);

    }

    wname = clean_name(ename, 0);

    free(ename);

  }

  if ((tmp = args_get(args, 's')) != NULL) {

    ename = format_single(item, tmp, c, NULL, NULL, NULL);

    if (!check_name(ename)) {

      cmdq_error(item, "invalid session name: %s", ename);

      free(ename);

      goto fail;

    }

    sname = clean_name(ename, 0);

    free(ename);

  }

  if (args_has(args, 'A')) {

    if (sname != NULL)

      as = session_find(sname);

    else

      as = target->s;

    if (as != NULL) {

      xasprintf(&cp, "$%u", as->id);

      retval = cmd_attach_session(item, cp,

          args_has(args, 'D'), args_has(args, 'X'), 0,

          args_get(args, 'c'), args_has(args, 'E'),

          args_get(args, 'f'));

      free(cp);

      free(wname);

      free(sname);

      return (retval);

    }

  }

  if (sname != NULL && session_find(sname) != NULL) {

    cmdq_error(item, "duplicate session: %s", sname);

    goto fail;

  }

  /* Is this going to be part of a session group? */

  group = args_get(args, 't');

  if (group != NULL) {

    groupwith = target->s;

    if (groupwith == NULL)

      sg = session_group_find(group);

    else

      sg = session_group_contains(groupwith);

    if (sg != NULL)

      prefix = xstrdup(sg->name);

    else if (groupwith != NULL)

      prefix = xstrdup(groupwith->name);

    else {

      if (!check_name(group)) {

        cmdq_error(item,

            "invalid session group name: %s", group);

        goto fail;

      }

      prefix = clean_name(group, 0);

    }

  }

  /* Set -d if no client. */

  detached = args_has(args, 'd');

  if (c == NULL)

    detached = 1;

  else if (c->flags & CLIENT_CONTROL)

    is_control = 1;

  /* Is this client already attached? */

  already_attached = 0;

  if (c != NULL && c->session != NULL)

    already_attached = 1;

  /* Get the new session working directory. */

  if ((tmp = args_get(args, 'c')) != NULL)

    cwd = format_single(item, tmp, c, NULL, NULL, NULL);

  else

    cwd = xstrdup(server_client_get_cwd(c, NULL));

  /*

   * If this is a new client, check for nesting and save the termios

   * settings (part of which is used for new windows in this session).

   *

   * tcgetattr() is used rather than using tty.tio since if the client is

   * detached, tty_open won't be called. It must be done before opening

   * the terminal as that calls tcsetattr() to prepare for tmux taking

   * over.

   */

  if (!detached &&

      !already_attached &&

      c->fd != -1 &&

      (~c->flags & CLIENT_CONTROL)) {

    if (server_client_check_nested(cmdq_get_client(item))) {

      cmdq_error(item, "sessions should be nested with care, "

          "unset $TMUX to force");

      goto fail;

    }

    if (tcgetattr(c->fd, &tio) != 0)

      fatal("tcgetattr failed");

    tiop = &tio;

  } else

    tiop = NULL;

  /* Open the terminal if necessary. */

  if (!detached && !already_attached) {

    if (server_client_open(c, &cause) != 0) {

      cmdq_error(item, "open terminal failed: %s", cause);

      free(cause);

      goto fail;

    }

  }

  /* Get default session size. */

  if (args_has(args, 'x')) {

    tmp = args_get(args, 'x');

    if (strcmp(tmp, "-") == 0) {

      if (c != NULL)

        dsx = c->tty.sx;

      else

        dsx = 80;

    } else {

      dsx = strtonum(tmp, 1, USHRT_MAX, &errstr);

      if (errstr != NULL) {

        cmdq_error(item, "width %s", errstr);

        goto fail;

      }

    }

  } else

    dsx = 80;

  if (args_has(args, 'y')) {

    tmp = args_get(args, 'y');

    if (strcmp(tmp, "-") == 0) {

      if (c != NULL)

        dsy = c->tty.sy;

      else

        dsy = 24;

    } else {

      dsy = strtonum(tmp, 1, USHRT_MAX, &errstr);

      if (errstr != NULL) {

        cmdq_error(item, "height %s", errstr);

        goto fail;

      }

    }

  } else

    dsy = 24;

  /* Find new session size. */

  if (!detached && !is_control) {

    sx = c->tty.sx;

    sy = c->tty.sy;

    if (sy > 0 && options_get_number(global_s_options, "status"))

      sy--;

  } else {

    tmp = options_get_string(global_s_options, "default-size");

    if (sscanf(tmp, "%ux%u", &sx, &sy) != 2) {

      sx = dsx;

      sy = dsy;

    } else {

      if (args_has(args, 'x'))

        sx = dsx;

      if (args_has(args, 'y'))

        sy = dsy;

    }

  }

  if (sx == 0)

    sx = 1;

  if (sy == 0)

    sy = 1;

  /* Create the new session. */

  oo = options_create(global_s_options);

  if (args_has(args, 'x') || args_has(args, 'y')) {

    if (!args_has(args, 'x'))

      dsx = sx;

    if (!args_has(args, 'y'))

      dsy = sy;

    options_set_string(oo, "default-size", 0, "%ux%u", dsx, dsy);

  }

  env = environ_create();

  if (c != NULL && !args_has(args, 'E'))

    environ_update(global_s_options, c->environ, env);

  av = args_first_value(args, 'e');

  while (av != NULL) {

    environ_put(env, av->string, 0);

    av = args_next_value(av);

  }

  s = session_create(prefix, sname, cwd, env, oo, tiop);

  /* Spawn the initial window. */

  sc.item = item;

  sc.s = s;

  if (!detached)

    sc.tc = c;

  sc.name = wname;

  args_to_vector(args, &sc.argc, &sc.argv);

  sc.idx = -1;

  sc.cwd = args_get(args, 'c');

  sc.flags = 0;

  if (spawn_window(&sc, &cause) == NULL) {

    session_destroy(s, 0, __func__);

    cmdq_error(item, "create window failed: %s", cause);

    free(cause);

    goto fail;

  }

  /*

   * If a target session is given, this is to be part of a session group,

   * so add it to the group and synchronize.

   */

  if (group != NULL) {

    if (sg == NULL && groupwith == NULL)

      sg = session_group_new(group);

    else if (sg == NULL) {

      cp = xstrdup(groupwith->name);

      for (idx = 1; session_group_find(cp) != NULL; idx++) {

        free(cp);

        xasprintf(&cp, "%s-%u", groupwith->name, idx);

      }

      sg = session_group_new(cp);

      free(cp);

      session_group_add(sg, groupwith);

    }

    session_group_add(sg, s);

    session_group_synchronize_to(s);

    session_select(s, RB_MIN(winlinks, &s->windows)->idx);

  }

  events_fire_session("session-created", s);

  /*

   * Set the client to the new session. If a command client exists, it is

   * taking this session and needs to get MSG_READY and stay around.

   */

  if (!detached) {

    if (args_has(args, 'f'))

      server_client_set_flags(c, args_get(args, 'f'));

    if (!already_attached) {

      if (~c->flags & CLIENT_CONTROL)

        proc_send(c->peer, MSG_READY, -1, NULL, 0);

    } else if (c->session != NULL)

      c->last_session = c->session;

    server_client_set_session(c, s);

    if (~cmdq_get_flags(item) & CMDQ_STATE_REPEAT)

      server_client_set_key_table(c, NULL);

  }

  /* Print if requested. */

  if (args_has(args, 'P')) {

    if ((template = args_get(args, 'F')) == NULL)

      template = NEW_SESSION_TEMPLATE;

    cp = format_single(item, template, c, s, s->curw, NULL);

    cmdq_print(item, "%s", cp);

    free(cp);

  }

  if (!detached)

    c->flags |= CLIENT_ATTACHED;

  if (!args_has(args, 'd'))

    cmd_find_from_session(current, s, 0);

  cmd_find_from_session(&fs, s, 0);

  cmdq_insert_hook(s, item, &fs, "after-new-session");

  if (cfg_finished)

    cfg_show_causes(s);

  if (sc.argv != NULL)

    cmd_free_argv(sc.argc, sc.argv);

  free(cwd);

  free(wname);

  free(sname);

  free(prefix);

  return (CMD_RETURN_NORMAL);

fail:

  if (sc.argv != NULL)

    cmd_free_argv(sc.argc, sc.argv);

  free(cwd);

  free(wname);

  free(sname);

  free(prefix);

  return (CMD_RETURN_ERROR);

}