text: /*
   * Copyright (c) 1994-1996, 1998-2011 Todd C. Miller <Todd.Miller@courtesan.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 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.
   *
   * Sponsored in part by the Defense Advanced Research Projects
   * Agency (DARPA) and Air Force Research Laboratory, Air Force
   * Materiel Command, USAF, under agreement number F39502-99-1-0512.
   */
  
  #ifdef __TANDEM
  # include <floss.h>
  #endif
  
  #include <config.h>
  
  #include <sys/types.h>
  #include <sys/param.h>
  #include <sys/stat.h>
  #include <sys/ioctl.h>
  #include <sys/wait.h>
  #include <stdio.h>
  #ifdef STDC_HEADERS
  # include <stdlib.h>
  # include <stddef.h>
  #else
  # ifdef HAVE_STDLIB_H
  #  include <stdlib.h>
  # endif
  #endif /* STDC_HEADERS */
  #ifdef HAVE_STRING_H
  # include <string.h>
  #endif /* HAVE_STRING_H */
  #ifdef HAVE_STRINGS_H
  # include <strings.h>
  #endif /* HAVE_STRINGS_H */
  #ifdef HAVE_UNISTD_H
  # include <unistd.h>
  #endif /* HAVE_UNISTD_H */
  #ifdef HAVE_SETLOCALE
  # include <locale.h>
  #endif /* HAVE_SETLOCALE */
  #ifdef HAVE_NL_LANGINFO
  # include <langinfo.h>
  #endif /* HAVE_NL_LANGINFO */
  #include <pwd.h>
  #include <grp.h>
  #include <signal.h>
  #include <time.h>
  #include <ctype.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <setjmp.h>
  
  #include "sudoers.h"
  
  static void do_syslog(int, char *);
  static void do_logfile(char *);
  static void send_mail(const char *fmt, ...);
  static int should_mail(int);
  static void mysyslog(int, const char *, ...);
  static char *new_logline(const char *, int);
  
  extern sigjmp_buf error_jmp;
  
  #define MAXSYSLOGTRIES	16	/* num of retries for broken syslogs */
  
  /*
   * We do an openlog(3)/closelog(3) for each message because some
   * authentication methods (notably PAM) use syslog(3) for their
   * own nefarious purposes and may call openlog(3) and closelog(3).
   * Note that because we don't want to assume that all systems have
   * vsyslog(3) (HP-UX doesn't) "%m" will not be expanded.
   * Sadly this is a maze of #ifdefs.
   */
  static void
  mysyslog(int pri, const char *fmt, ...)
  {
  #ifdef BROKEN_SYSLOG
      int i;
  #endif
      char buf[MAXSYSLOGLEN+1];
      va_list ap;
  
      va_start(ap, fmt);
  #ifdef LOG_NFACILITIES
      openlog("sudo", 0, def_syslog);
  #else
      openlog("sudo", 0);
  #endif
      vsnprintf(buf, sizeof(buf), fmt, ap);
  #ifdef BROKEN_SYSLOG
      /*
       * Some versions of syslog(3) don't guarantee success and return
       * an int (notably HP-UX < 10.0).  So, if at first we don't succeed,
       * try, try again...
       */
      for (i = 0; i < MAXSYSLOGTRIES; i++)
  	if (syslog(pri, "%s", buf) == 0)
  	    break;
  #else
      syslog(pri, "%s", buf);
  #endif /* BROKEN_SYSLOG */
      va_end(ap);
      closelog();
  }
  
  #define FMT_FIRST "%8s : %s"
  #define FMT_CONTD "%8s : (command continued) %s"
  
  /*
   * Log a message to syslog, pre-pending the username and splitting the
   * message into parts if it is longer than MAXSYSLOGLEN.
   */
  static void
  do_syslog(int pri, char *msg)
  {
      size_t len, maxlen;
      char *p, *tmp, save;
      const char *fmt;
  
  #ifdef HAVE_SETLOCALE
      const char *old_locale = estrdup(setlocale(LC_ALL, NULL));
      if (!setlocale(LC_ALL, def_sudoers_locale))
  	setlocale(LC_ALL, "C");
  #endif /* HAVE_SETLOCALE */
  
      /*
       * Log the full line, breaking into multiple syslog(3) calls if necessary
       */
      fmt = _(FMT_FIRST);
      maxlen = MAXSYSLOGLEN - (strlen(fmt) - 5 + strlen(user_name));
      for (p = msg; *p != '\0'; ) {
  	len = strlen(p);
  	if (len > maxlen) {
  	    /*
  	     * Break up the line into what will fit on one syslog(3) line
  	     * Try to avoid breaking words into several lines if possible.
  	     */
  	    tmp = memrchr(p, ' ', maxlen);
  	    if (tmp == NULL)
  		tmp = p + maxlen;
  
  	    /* NULL terminate line, but save the char to restore later */
  	    save = *tmp;
  	    *tmp = '\0';
  
  	    mysyslog(pri, fmt, user_name, p);
  
  	    *tmp = save;			/* restore saved character */
  
  	    /* Advance p and eliminate leading whitespace */
  	    for (p = tmp; *p == ' '; p++)
  		;
  	} else {
  	    mysyslog(pri, fmt, user_name, p);
  	    p += len;
  	}
  	fmt = _(FMT_CONTD);
  	maxlen = MAXSYSLOGLEN - (strlen(fmt) - 5 + strlen(user_name));
      }
  
  #ifdef HAVE_SETLOCALE
      setlocale(LC_ALL, old_locale);
      efree((void *)old_locale);
  #endif /* HAVE_SETLOCALE */
  }
  
  static void
  do_logfile(char *msg)
  {
      char *full_line;
      size_t len;
      mode_t oldmask;
      time_t now;
      FILE *fp;
  
      oldmask = umask(077);
      fp = fopen(def_logfile, "a");
      (void) umask(oldmask);
      if (fp == NULL) {
  	send_mail(_("unable to open log file: %s: %s"),
  	    def_logfile, strerror(errno));
      } else if (!lock_file(fileno(fp), SUDO_LOCK)) {
  	send_mail(_("unable to lock log file: %s: %s"),
  	    def_logfile, strerror(errno));
      } else {
  #ifdef HAVE_SETLOCALE
  	const char *old_locale = estrdup(setlocale(LC_ALL, NULL));
  	if (!setlocale(LC_ALL, def_sudoers_locale))
  	    setlocale(LC_ALL, "C");
  #endif /* HAVE_SETLOCALE */
  
  	now = time(NULL);
  	if (def_loglinelen < sizeof(LOG_INDENT)) {
  	    /* Don't pretty-print long log file lines (hard to grep) */
  	    if (def_log_host)
  		(void) fprintf(fp, "%s : %s : HOST=%s : %s\n",
  		    get_timestr(now, def_log_year), user_name, user_shost, msg);
  	    else
  		(void) fprintf(fp, "%s : %s : %s\n",
  		    get_timestr(now, def_log_year), user_name, msg);
  	} else {
  	    if (def_log_host)
  		len = easprintf(&full_line, "%s : %s : HOST=%s : %s",
  		    get_timestr(now, def_log_year), user_name, user_shost, msg);
  	    else
  		len = easprintf(&full_line, "%s : %s : %s",
  		    get_timestr(now, def_log_year), user_name, msg);
  
  	    /*
  	     * Print out full_line with word wrap around def_loglinelen chars.
  	     */
  	    writeln_wrap(fp, full_line, len, def_loglinelen);
  	    efree(full_line);
  	}
  	(void) fflush(fp);
  	(void) lock_file(fileno(fp), SUDO_UNLOCK);
  	(void) fclose(fp);
  
  #ifdef HAVE_SETLOCALE
  	setlocale(LC_ALL, old_locale);
  	efree((void *)old_locale);
  #endif /* HAVE_SETLOCALE */
      }
  }
  
  /*
   * Log and mail the denial message, optionally informing the user.
   */
  void
  log_denial(int status, int inform_user)
  {
      char *message;
      char *logline;
  
      /* Set error message. */
      if (ISSET(status, FLAG_NO_USER))
  	message = _("user NOT in sudoers");
      else if (ISSET(status, FLAG_NO_HOST))
  	message = _("user NOT authorized on host");
      else
  	message = _("command not allowed");
  
      logline = new_logline(message, 0);
  
      if (should_mail(status))
  	send_mail("%s", logline);	/* send mail based on status */
  
      /* Inform the user if they failed to authenticate.  */
      if (inform_user) {
  	if (ISSET(status, FLAG_NO_USER)) {
  	    sudo_printf(SUDO_CONV_ERROR_MSG, _("%s is not in the sudoers "
  		"file.  This incident will be reported.\n"), user_name);
  	} else if (ISSET(status, FLAG_NO_HOST)) {
  	    sudo_printf(SUDO_CONV_ERROR_MSG, _("%s is not allowed to run sudo "
  		"on %s.  This incident will be reported.\n"),
  		user_name, user_shost);
  	} else if (ISSET(status, FLAG_NO_CHECK)) {
  	    sudo_printf(SUDO_CONV_ERROR_MSG, _("Sorry, user %s may not run "
  		"sudo on %s.\n"), user_name, user_shost);
  	} else {
  	    sudo_printf(SUDO_CONV_ERROR_MSG, _("Sorry, user %s is not allowed "
  		"to execute '%s%s%s' as %s%s%s on %s.\n"),
  		user_name, user_cmnd, user_args ? " " : "",
  		user_args ? user_args : "",
  		list_pw ? list_pw->pw_name : runas_pw ?
  		runas_pw->pw_name : user_name, runas_gr ? ":" : "",
  		runas_gr ? runas_gr->gr_name : "", user_host);
  	}
      }
  
      /*
       * Log via syslog and/or a file.
       */
      if (def_syslog)
  	do_syslog(def_syslog_badpri, logline);
      if (def_logfile)
  	do_logfile(logline);
  
      efree(logline);
  }
  
  /*
   * Log and potentially mail the allowed command.
   */
  void
  log_allowed(int status)
  {
      char *logline;
  
      logline = new_logline(NULL, 0);
  
      if (should_mail(status))
  	send_mail("%s", logline);	/* send mail based on status */
  
      /*
       * Log via syslog and/or a file.
       */
      if (def_syslog)
  	do_syslog(def_syslog_goodpri, logline);
      if (def_logfile)
  	do_logfile(logline);
  
      efree(logline);
  }
  
  void
  log_error(int flags, const char *fmt, ...)
  {
      int serrno = errno;
      char *message;
      char *logline;
      va_list ap;
  
      /* Expand printf-style format + args. */
      va_start(ap, fmt);
      evasprintf(&message, fmt, ap);
      va_end(ap);
  
      /* Become root if we are not already to avoid user interference */
      set_perms(PERM_ROOT|PERM_NOEXIT);
  
      if (ISSET(flags, MSG_ONLY))
  	logline = message;
      else
  	logline = new_logline(message, ISSET(flags, USE_ERRNO) ? serrno : 0);
  
      /*
       * Tell the user.
       */
      if (!ISSET(flags, NO_STDERR)) {
  	if (ISSET(flags, USE_ERRNO))
  	    warning("%s", message);
  	else
  	    warningx("%s", message);
      }
      if (logline != message)
          efree(message);
  
      /*
       * Send a copy of the error via mail.
       */
      if (!ISSET(flags, NO_MAIL))
  	send_mail("%s", logline);
  
      /*
       * Log to syslog and/or a file.
       */
      if (def_syslog)
  	do_syslog(def_syslog_badpri, logline);
      if (def_logfile)
  	do_logfile(logline);
  
      efree(logline);
  
      restore_perms();
  
      if (!ISSET(flags, NO_EXIT)) {
  	plugin_cleanup(0);
  	siglongjmp(error_jmp, 1);
      }
  }
  
  #define MAX_MAILFLAGS	63
  
  /*
   * Send a message to MAILTO user
   */
  static void
  send_mail(const char *fmt, ...)
  {
      FILE *mail;
      char *p;
      int fd, pfd[2], status;
      pid_t pid, rv;
      sigaction_t sa;
      va_list ap;
  #ifndef NO_ROOT_MAILER
      static char *root_envp[] = {
  	"HOME=/",
  	"PATH=/usr/bin:/bin:/usr/sbin:/sbin",
  	"LOGNAME=root",
  	"USERNAME=root",
  	"USER=root",
  	NULL
      };
  #endif /* NO_ROOT_MAILER */
  
      /* Just return if mailer is disabled. */
      if (!def_mailerpath || !def_mailto)
  	return;
  
      /* Fork and return, child will daemonize. */
      switch (pid = fork()) {
  	case -1:
  	    /* Error. */
  	    error(1, _("unable to fork"));
  	    break;
  	case 0:
  	    /* Child. */
  	    switch (pid = fork()) {
  		case -1:
  		    /* Error. */
  		    mysyslog(LOG_ERR, _("unable to fork: %m"));
  		    _exit(1);
  		case 0:
  		    /* Grandchild continues below. */
  		    break;
  		default:
  		    /* Parent will wait for us. */
  		    _exit(0);
  	    }
  	    break;
  	default:
  	    /* Parent. */
  	    do {
  		rv = waitpid(pid, &status, 0);
  	    } while (rv == -1 && errno == EINTR);
  	    return;
      }
  
      /* Daemonize - disassociate from session/tty. */
      if (setsid() == -1)
        warning("setsid");
      if (chdir("/") == -1)
        warning("chdir(/)");
      if ((fd = open(_PATH_DEVNULL, O_RDWR, 0644)) != -1) {
  	(void) dup2(fd, STDIN_FILENO);
  	(void) dup2(fd, STDOUT_FILENO);
  	(void) dup2(fd, STDERR_FILENO);
      }
  
  #ifdef HAVE_SETLOCALE
      if (!setlocale(LC_ALL, def_sudoers_locale)) {
  	setlocale(LC_ALL, "C");
  	efree(def_sudoers_locale);
  	def_sudoers_locale = estrdup("C");
      }
  #endif /* HAVE_SETLOCALE */
  
      /* Close password, group and other fds so we don't leak. */
      sudo_endpwent();
      sudo_endgrent();
      closefrom(STDERR_FILENO + 1);
  
      /* Ignore SIGPIPE in case mailer exits prematurely (or is missing). */
      zero_bytes(&sa, sizeof(sa));
      sigemptyset(&sa.sa_mask);
      sa.sa_flags = SA_INTERRUPT;
      sa.sa_handler = SIG_IGN;
      (void) sigaction(SIGPIPE, &sa, NULL);
  
      if (pipe(pfd) == -1) {
  	mysyslog(LOG_ERR, _("unable to open pipe: %m"));
  	_exit(1);
      }
  
      switch (pid = fork()) {
  	case -1:
  	    /* Error. */
  	    mysyslog(LOG_ERR, _("unable to fork: %m"));
  	    _exit(1);
  	    break;
  	case 0:
  	    {
  		char *argv[MAX_MAILFLAGS + 1];
  		char *mpath, *mflags;
  		int i;
  
  		/* Child, set stdin to output side of the pipe */
  		if (pfd[0] != STDIN_FILENO) {
  		    if (dup2(pfd[0], STDIN_FILENO) == -1) {
  			mysyslog(LOG_ERR, _("unable to dup stdin: %m"));
  			_exit(127);
  		    }
  		    (void) close(pfd[0]);
  		}
  		(void) close(pfd[1]);
  
  		/* Build up an argv based on the mailer path and flags */
  		mflags = estrdup(def_mailerflags);
  		mpath = estrdup(def_mailerpath);
  		if ((argv[0] = strrchr(mpath, ' ')))
  		    argv[0]++;
  		else
  		    argv[0] = mpath;
  
  		i = 1;
  		if ((p = strtok(mflags, " \t"))) {
  		    do {
  			argv[i] = p;
  		    } while (++i < MAX_MAILFLAGS && (p = strtok(NULL, " \t")));
  		}
  		argv[i] = NULL;
  
  		/*
  		 * Depending on the config, either run the mailer as root
  		 * (so user cannot kill it) or as the user (for the paranoid).
  		 */
  #ifndef NO_ROOT_MAILER
  		set_perms(PERM_ROOT|PERM_NOEXIT);
  		execve(mpath, argv, root_envp);
  #else
  		set_perms(PERM_FULL_USER|PERM_NOEXIT);
  		execv(mpath, argv);
  #endif /* NO_ROOT_MAILER */
  		mysyslog(LOG_ERR, _("unable to execute %s: %m"), mpath);
  		_exit(127);
  	    }
  	    break;
      }
  
      (void) close(pfd[0]);
      mail = fdopen(pfd[1], "w");
  
      /* Pipes are all setup, send message. */
      (void) fprintf(mail, "To: %s\nFrom: %s\nAuto-Submitted: %s\nSubject: ",
  	def_mailto, def_mailfrom ? def_mailfrom : user_name, "auto-generated");
      for (p = def_mailsub; *p; p++) {
  	/* Expand escapes in the subject */
  	if (*p == '%' && *(p+1) != '%') {
  	    switch (*(++p)) {
  		case 'h':
  		    (void) fputs(user_host, mail);
  		    break;
  		case 'u':
  		    (void) fputs(user_name, mail);
  		    break;
  		default:
  		    p--;
  		    break;
  	    }
  	} else
  	    (void) fputc(*p, mail);
      }
  
  #ifdef HAVE_NL_LANGINFO
      if (strcmp(def_sudoers_locale, "C") != 0)
  	(void) fprintf(mail, "\nContent-Type: text/plain; charset=\"%s\"\nContent-Transfer-Encoding: 8bit", nl_langinfo(CODESET));
  #endif /* HAVE_NL_LANGINFO */
  
      (void) fprintf(mail, "\n\n%s : %s : %s : ", user_host,
  	get_timestr(time(NULL), def_log_year), user_name);
      va_start(ap, fmt);
      (void) vfprintf(mail, fmt, ap);
      va_end(ap);
      fputs("\n\n", mail);
  
      fclose(mail);
      do {
          rv = waitpid(pid, &status, 0);
      } while (rv == -1 && errno == EINTR);
      _exit(0);
  }
  
  /*
   * Determine whether we should send mail based on "status" and defaults options.
   */
  static int
  should_mail(int status)
  {
  
      return def_mail_always || ISSET(status, VALIDATE_ERROR) ||
  	(def_mail_no_user && ISSET(status, FLAG_NO_USER)) ||
  	(def_mail_no_host && ISSET(status, FLAG_NO_HOST)) ||
  	(def_mail_no_perms && !ISSET(status, VALIDATE_OK));
  }
  
  #define	LL_TTY_STR	"TTY="
  #define	LL_CWD_STR	"PWD="		/* XXX - should be CWD= */
  #define	LL_USER_STR	"USER="
  #define	LL_GROUP_STR	"GROUP="
  #define	LL_ENV_STR	"ENV="
  #define	LL_CMND_STR	"COMMAND="
  #define	LL_TSID_STR	"TSID="
  
  #define IS_SESSID(s) ( \
      isalnum((unsigned char)(s)[0]) && isalnum((unsigned char)(s)[1]) && \
      (s)[2] == '/' && \
      isalnum((unsigned char)(s)[3]) && isalnum((unsigned char)(s)[4]) && \
      (s)[5] == '/' && \
      isalnum((unsigned char)(s)[6]) && isalnum((unsigned char)(s)[7]) && \
      (s)[8] == '\0')
  
  /*
   * Allocate and fill in a new logline.
   */
  static char *
  new_logline(const char *message, int serrno)
  {
      size_t len = 0;
      char *errstr = NULL;
      char *evstr = NULL;
      char *line, sessid[7], *tsid = NULL;
  
      /* A TSID may be a sudoers-style session ID or a free-form string. */
      if (sudo_user.iolog_file != NULL) {
  	if (IS_SESSID(sudo_user.iolog_file)) {
  	    sessid[0] = sudo_user.iolog_file[0];
  	    sessid[1] = sudo_user.iolog_file[1];
  	    sessid[2] = sudo_user.iolog_file[3];
  	    sessid[3] = sudo_user.iolog_file[4];
  	    sessid[4] = sudo_user.iolog_file[6];
  	    sessid[5] = sudo_user.iolog_file[7];
  	    sessid[6] = '\0';
  	    tsid = sessid;
  	} else {
  	    tsid = sudo_user.iolog_file;
  	}
      }
  
      /*
       * Compute line length
       */
      if (message != NULL)
  	len += strlen(message) + 3;
      if (serrno) {
  	errstr = strerror(serrno);
  	len += strlen(errstr) + 3;
      }
      len += sizeof(LL_TTY_STR) + 2 + strlen(user_tty);
      len += sizeof(LL_CWD_STR) + 2 + strlen(user_cwd);
      if (runas_pw != NULL)
  	len += sizeof(LL_USER_STR) + 2 + strlen(runas_pw->pw_name);
      if (runas_gr != NULL)
  	len += sizeof(LL_GROUP_STR) + 2 + strlen(runas_gr->gr_name);
      if (tsid != NULL)
  	len += sizeof(LL_TSID_STR) + 2 + strlen(tsid);
      if (sudo_user.env_vars != NULL) {
  	size_t evlen = 0;
  	char * const *ep;
  
  	for (ep = sudo_user.env_vars; *ep != NULL; ep++)
  	    evlen += strlen(*ep) + 1;
  	evstr = emalloc(evlen);
  	evstr[0] = '\0';
  	for (ep = sudo_user.env_vars; *ep != NULL; ep++) {
  	    strlcat(evstr, *ep, evlen);
  	    strlcat(evstr, " ", evlen);	/* NOTE: last one will fail */
  	}
  	len += sizeof(LL_ENV_STR) + 2 + evlen;
      }
      if (user_cmnd != NULL) {
  	/* Note: we log "sudo -l command arg ..." as "list command arg ..." */
  	len += sizeof(LL_CMND_STR) - 1 + strlen(user_cmnd);
  	if (ISSET(sudo_mode, MODE_CHECK))
  	    len += sizeof("list ") - 1;
  	if (user_args != NULL)
  	    len += strlen(user_args) + 1;
      }
  
      /*
       * Allocate and build up the line.
       */
      line = emalloc(++len);
      line[0] = '\0';
  
      if (message != NULL) {
  	if (strlcat(line, message, len) >= len ||
  	    strlcat(line, errstr ? " : " : " ; ", len) >= len)
  	    goto toobig;
      }
      if (serrno) {
  	if (strlcat(line, errstr, len) >= len ||
  	    strlcat(line, " ; ", len) >= len)
  	    goto toobig;
      }
      if (strlcat(line, LL_TTY_STR, len) >= len ||
  	strlcat(line, user_tty, len) >= len ||
  	strlcat(line, " ; ", len) >= len)
  	goto toobig;
      if (strlcat(line, LL_CWD_STR, len) >= len ||
  	strlcat(line, user_cwd, len) >= len ||
  	strlcat(line, " ; ", len) >= len)
  	goto toobig;
      if (runas_pw != NULL) {
  	if (strlcat(line, LL_USER_STR, len) >= len ||
  	    strlcat(line, runas_pw->pw_name, len) >= len ||
  	    strlcat(line, " ; ", len) >= len)
  	    goto toobig;
      }
      if (runas_gr != NULL) {
  	if (strlcat(line, LL_GROUP_STR, len) >= len ||
  	    strlcat(line, runas_gr->gr_name, len) >= len ||
  	    strlcat(line, " ; ", len) >= len)
  	    goto toobig;
      }
      if (tsid != NULL) {
  	if (strlcat(line, LL_TSID_STR, len) >= len ||
  	    strlcat(line, tsid, len) >= len ||
  	    strlcat(line, " ; ", len) >= len)
  	    goto toobig;
      }
      if (evstr != NULL) {
  	if (strlcat(line, LL_ENV_STR, len) >= len ||
  	    strlcat(line, evstr, len) >= len ||
  	    strlcat(line, " ; ", len) >= len)
  	    goto toobig;
  	efree(evstr);
      }
      if (user_cmnd != NULL) {
  	if (strlcat(line, LL_CMND_STR, len) >= len)
  	    goto toobig;
  	if (ISSET(sudo_mode, MODE_CHECK) && strlcat(line, "list ", len) >= len)
  	    goto toobig;
  	if (strlcat(line, user_cmnd, len) >= len)
  	    goto toobig;
  	if (user_args != NULL) {
  	    if (strlcat(line, " ", len) >= len ||
  		strlcat(line, user_args, len) >= len)
  		goto toobig;
  	}
      }
  
      return line;
  toobig:
      errorx(1, _("internal error: insufficient space for log line"));
  }
  