289 lines
7.3 KiB
C
289 lines
7.3 KiB
C
/*
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* Copyright 1989 - 1994, Julianne Frances Haugh
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Separated from setup.c. --marekm
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*/
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#include <config.h>
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#ident "$Id: setupenv.c,v 1.24 2006/05/12 23:11:13 kloczek Exp $"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <ctype.h>
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#include "prototypes.h"
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#include "defines.h"
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#include <pwd.h>
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#include "getdef.h"
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#ifndef USE_PAM
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static void
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addenv_path (const char *varname, const char *dirname, const char *filename)
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{
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char *buf;
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buf = xmalloc (strlen (dirname) + strlen (filename) + 2);
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sprintf (buf, "%s/%s", dirname, filename);
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addenv (varname, buf);
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free (buf);
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}
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static void read_env_file (const char *filename)
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{
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FILE *fp;
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char buf[1024];
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char *cp, *name, *val;
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fp = fopen (filename, "r");
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if (!fp)
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return;
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while (fgets (buf, sizeof buf, fp) == buf) {
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cp = strrchr (buf, '\n');
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if (!cp)
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break;
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*cp = '\0';
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cp = buf;
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/* ignore whitespace and comments */
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while (*cp && isspace (*cp))
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cp++;
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if (*cp == '\0' || *cp == '#')
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continue;
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/*
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* ignore lines which don't follow the name=value format
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* (for example, the "export NAME" shell commands)
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*/
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name = cp;
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while (*cp && !isspace (*cp) && *cp != '=')
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cp++;
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if (*cp != '=')
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continue;
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/* NUL-terminate the name */
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*cp++ = '\0';
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val = cp;
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#if 0 /* XXX untested, and needs rewrite with fewer goto's :-) */
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/*
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(state, char_type) -> (state, action)
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state: unquoted, single_quoted, double_quoted, escaped, double_quoted_escaped
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char_type: normal, white, backslash, single, double
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action: remove_curr, remove_curr_skip_next, remove_prev, finish XXX
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*/
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no_quote:
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if (*cp == '\\') {
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/* remove the backslash */
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remove_char (cp);
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/* skip over the next character */
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if (*cp)
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cp++;
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goto no_quote;
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} else if (*cp == '\'') {
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/* remove the quote */
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remove_char (cp);
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/* now within single quotes */
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goto s_quote;
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} else if (*cp == '"') {
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/* remove the quote */
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remove_char (cp);
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/* now within double quotes */
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goto d_quote;
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} else if (*cp == '\0') {
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/* end of string */
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goto finished;
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} else if (isspace (*cp)) {
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/* unescaped whitespace - end of string */
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*cp = '\0';
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goto finished;
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} else {
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cp++;
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goto no_quote;
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}
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s_quote:
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if (*cp == '\'') {
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/* remove the quote */
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remove_char (cp);
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/* unquoted again */
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goto no_quote;
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} else if (*cp == '\0') {
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/* end of string */
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goto finished;
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} else {
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/* preserve everything within single quotes */
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cp++;
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goto s_quote;
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}
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d_quote:
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if (*cp == '\"') {
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/* remove the quote */
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remove_char (cp);
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/* unquoted again */
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goto no_quote;
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} else if (*cp == '\\') {
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cp++;
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/* if backslash followed by double quote, remove backslash
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else skip over the backslash and following char */
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if (*cp == '"')
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remove_char (cp - 1);
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else if (*cp)
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cp++;
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goto d_quote;
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}
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eise if (*cp == '\0') {
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/* end of string */
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goto finished;
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} else {
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/* preserve everything within double quotes */
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goto d_quote;
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}
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finished:
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#endif /* 0 */
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/*
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* XXX - should handle quotes, backslash escapes, etc.
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* like the shell does.
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*/
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addenv (name, val);
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}
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fclose (fp);
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}
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#endif /* USE_PAM */
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/*
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* change to the user's home directory
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* set the HOME, SHELL, MAIL, PATH, and LOGNAME or USER environmental
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* variables.
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*/
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void setup_env (struct passwd *info)
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{
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#ifndef USE_PAM
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char *envf;
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char *cp;
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#endif
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/*
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* Change the current working directory to be the home directory
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* of the user. It is a fatal error for this process to be unable
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* to change to that directory. There is no "default" home
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* directory.
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*
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* We no longer do it as root - should work better on NFS-mounted
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* home directories. Some systems default to HOME=/, so we make
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* this a configurable option. --marekm
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*/
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if (chdir (info->pw_dir) == -1) {
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static char temp_pw_dir[] = "/";
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if (!getdef_bool ("DEFAULT_HOME") || chdir ("/") == -1) {
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fprintf (stderr, _("Unable to cd to '%s'\n"),
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info->pw_dir);
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SYSLOG ((LOG_WARN,
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"unable to cd to `%s' for user `%s'\n",
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info->pw_dir, info->pw_name));
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closelog ();
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exit (1);
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}
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puts (_("No directory, logging in with HOME=/"));
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info->pw_dir = temp_pw_dir;
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}
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/*
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* Create the HOME environmental variable and export it.
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*/
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addenv ("HOME", info->pw_dir);
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/*
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* Create the SHELL environmental variable and export it.
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*/
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if (info->pw_shell == (char *) 0 || !*info->pw_shell) {
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static char temp_pw_shell[] = "/bin/sh";
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info->pw_shell = temp_pw_shell;
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}
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addenv ("SHELL", info->pw_shell);
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/*
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* Export the user name. For BSD derived systems, it's "USER", for
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* all others it's "LOGNAME". We set both of them.
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*/
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addenv ("USER", info->pw_name);
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addenv ("LOGNAME", info->pw_name);
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#ifndef USE_PAM
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/*
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* Create the PATH environmental variable and export it.
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*/
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cp = getdef_str ((info->pw_uid == 0) ? "ENV_SUPATH" : "ENV_PATH");
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if (!cp) {
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/* not specified, use a minimal default */
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addenv ("PATH=/bin:/usr/bin", NULL);
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} else if (strchr (cp, '=')) {
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/* specified as name=value (PATH=...) */
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addenv (cp, NULL);
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} else {
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/* only value specified without "PATH=" */
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addenv ("PATH", cp);
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}
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/*
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* Create the MAIL environmental variable and export it. login.defs
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* knows the prefix.
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*/
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if (getdef_bool ("MAIL_CHECK_ENAB")) {
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if ((cp = getdef_str ("MAIL_DIR")))
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addenv_path ("MAIL", cp, info->pw_name);
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else if ((cp = getdef_str ("MAIL_FILE")))
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addenv_path ("MAIL", info->pw_dir, cp);
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else {
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#if defined(MAIL_SPOOL_FILE)
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addenv_path ("MAIL", info->pw_dir, MAIL_SPOOL_FILE);
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#elif defined(MAIL_SPOOL_DIR)
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addenv_path ("MAIL", MAIL_SPOOL_DIR, info->pw_name);
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#endif
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}
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}
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/*
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* Read environment from optional config file. --marekm
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*/
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if ((envf = getdef_str ("ENVIRON_FILE")))
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read_env_file (envf);
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#endif /* !USE_PAM */
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}
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