1 files changed, 353 insertions, 0 deletions
diff --git a/src/rc/rc-misc.c b/src/rc/rc-misc.c
new file mode 100644
index 00000000..0d8b8c1f
--- /dev/null
+++ b/src/rc/rc-misc.c
@@ -0,0 +1,353 @@
+/*
+   librc-misc.c
+   rc misc functions
+   */
+
+/* 
+ * Copyright 2007 Roy Marples
+ * All rights reserved
+
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+
+#ifdef __linux__
+#include <sys/sysinfo.h>
+#include <regex.h>
+#endif
+
+#include <sys/utsname.h>
+#include <ctype.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "rc.h"
+#include "rc-misc.h"
+#include "strlist.h"
+
+#define PROFILE_ENV     "/etc/profile.env"
+#define SYS_WHITELIST   RC_LIBDIR "/conf.d/env_whitelist"
+#define USR_WHITELIST   "/etc/conf.d/env_whitelist"
+#define RC_CONF         "/etc/rc.conf"
+#define RC_CONF_OLD     "/etc/conf.d/rc"
+
+#define PATH_PREFIX     RC_LIBDIR "/bin:/bin:/sbin:/usr/bin:/usr/sbin"
+
+static char **rc_conf = NULL;
+
+static void _free_rc_conf (void)
+{
+	rc_strlist_free (rc_conf);
+}
+
+char *rc_conf_value (const char *setting)
+{
+	if (! rc_conf) {
+		char *line;
+		int i;
+
+		rc_conf = rc_config_load (RC_CONF);
+		atexit (_free_rc_conf);
+
+		/* Support old configs */
+		if (exists (RC_CONF_OLD)) {
+			char **old = rc_config_load (RC_CONF_OLD);
+			rc_strlist_join (&rc_conf, old);
+			rc_strlist_free (old);
+		}
+
+		/* Convert old uppercase to lowercase */
+		STRLIST_FOREACH (rc_conf, line, i) {
+			char *p = line;
+			while (p && *p && *p != '=') {
+				if (isupper (*p))
+					*p = tolower (*p);
+				p++;
+			}
+		}
+	}
+
+	return (rc_config_value (rc_conf, setting));
+}
+
+bool rc_conf_yesno (const char *setting)
+{
+	return (rc_yesno (rc_conf_value (setting)));
+}
+
+char **env_filter (void)
+{
+	char **env = NULL;
+	char **whitelist = NULL;
+	char *env_name = NULL;
+	char **profile = NULL;
+	int count = 0;
+	bool got_path = false;
+	char *env_var;
+	int env_len;
+	char *token;
+	char *sep;
+	char *e;
+	char *p;
+	int pplen = strlen (PATH_PREFIX);
+
+	whitelist = rc_config_list (SYS_WHITELIST);
+	if (! whitelist)
+		fprintf (stderr, "system environment whitelist (" SYS_WHITELIST ") missing\n");
+
+	env = rc_config_list (USR_WHITELIST);
+	rc_strlist_join (&whitelist, env);
+	rc_strlist_free (env);
+	env = NULL;
+
+	if (! whitelist)
+		return (NULL);
+
+	if (exists (PROFILE_ENV))
+		profile = rc_config_load (PROFILE_ENV);
+
+	STRLIST_FOREACH (whitelist, env_name, count) {
+		char *space = strchr (env_name, ' ');
+		if (space)
+			*space = 0;
+
+		env_var = getenv (env_name);
+
+		if (! env_var && profile) {
+			env_len = strlen (env_name) + strlen ("export ") + 1;
+			p = xmalloc (sizeof (char) * env_len);
+			snprintf (p, env_len, "export %s", env_name);
+			env_var = rc_config_value (profile, p);
+			free (p);
+		}
+
+		if (! env_var)
+			continue;
+
+		/* Ensure our PATH is prefixed with the system locations first
+		   for a little extra security */
+		if (strcmp (env_name, "PATH") == 0 &&
+			strncmp (PATH_PREFIX, env_var, pplen) != 0)
+		{
+			got_path = true;
+			env_len = strlen (env_name) + strlen (env_var) + pplen + 2;
+			e = p = xmalloc (sizeof (char) * env_len);
+			p += snprintf (e, env_len, "%s=%s", env_name, PATH_PREFIX);
+
+			/* Now go through the env var and only add bits not in our PREFIX */
+			sep = env_var;
+			while ((token = strsep (&sep, ":"))) {
+				char *np = xstrdup (PATH_PREFIX);
+				char *npp = np;
+				char *tok = NULL;
+				while ((tok = strsep (&npp, ":")))
+					if (strcmp (tok, token) == 0)
+						break;
+				if (! tok)
+					p += snprintf (p, env_len - (p - e), ":%s", token);
+				free (np);
+			}
+			*p++ = 0;
+		} else {
+			env_len = strlen (env_name) + strlen (env_var) + 2;
+			e = xmalloc (sizeof (char) * env_len);
+			snprintf (e, env_len, "%s=%s", env_name, env_var);
+		}
+
+		rc_strlist_add (&env, e);
+		free (e);
+	}
+
+	/* We filtered the env but didn't get a PATH? Very odd.
+	   However, we do need a path, so use a default. */
+	if (! got_path) {
+		env_len = strlen ("PATH=") + strlen (PATH_PREFIX) + 2;
+		e = xmalloc (sizeof (char) * env_len);
+		snprintf (e, env_len, "PATH=%s", PATH_PREFIX);
+		rc_strlist_add (&env, e);
+		free (e);
+	}
+
+	rc_strlist_free (whitelist);
+	rc_strlist_free (profile);
+
+	return (env);
+}
+
+	/* Other systems may need this at some point, but for now it's Linux only */
+#ifdef __linux__
+static bool file_regex (const char *file, const char *regex)
+{
+	FILE *fp;
+	char *buffer;
+	regex_t re;
+	bool retval = false;
+	int result;
+
+	if (! (fp = fopen (file, "r")))
+		return (false);
+
+	buffer = xmalloc (sizeof (char) * RC_LINEBUFFER);
+	if ((result = regcomp (&re, regex, REG_EXTENDED | REG_NOSUB)) != 0) {
+		fclose (fp);
+		regerror (result, &re, buffer, RC_LINEBUFFER);
+		fprintf (stderr, "file_regex: %s", buffer);
+		free (buffer);
+		return (false);
+	}
+
+	while (fgets (buffer, RC_LINEBUFFER, fp)) {
+		if (regexec (&re, buffer, 0, NULL, 0) == 0)
+		{
+			retval = true;
+			break;
+		}
+	}
+	free (buffer);
+	fclose (fp);
+	regfree (&re);
+
+	return (retval);
+}
+#endif
+
+char **env_config (void)
+{
+	char **env = NULL;
+	char *line;
+	int i;
+#ifdef __linux__
+	char sys[6];
+#endif
+	struct utsname uts;
+	FILE *fp;
+	char buffer[PATH_MAX];
+	char *runlevel = rc_runlevel_get ();
+	char *p;
+
+	/* One char less to drop the trailing / */
+	i = strlen ("RC_LIBDIR=") + strlen (RC_LIBDIR) + 1;
+	line = xmalloc (sizeof (char) * i);
+	snprintf (line, i, "RC_LIBDIR=" RC_LIBDIR);
+	rc_strlist_add (&env, line);
+	free (line);
+
+	/* One char less to drop the trailing / */
+	i = strlen ("RC_SVCDIR=") + strlen (RC_SVCDIR) + 1;
+	line = xmalloc (sizeof (char) * i);
+	snprintf (line, i, "RC_SVCDIR=" RC_SVCDIR);
+	rc_strlist_add (&env, line);
+	free (line);
+
+	rc_strlist_add (&env, "RC_BOOTLEVEL=" RC_LEVEL_BOOT);
+
+	i = strlen ("RC_SOFTLEVEL=") + strlen (runlevel) + 1;
+	line = xmalloc (sizeof (char) * i);
+	snprintf (line, i, "RC_SOFTLEVEL=%s", runlevel);
+	rc_strlist_add (&env, line);
+	free (line);
+
+	if ((fp = fopen (RC_KSOFTLEVEL, "r"))) {
+		memset (buffer, 0, sizeof (buffer));
+		if (fgets (buffer, sizeof (buffer), fp)) {
+			i = strlen (buffer) - 1;
+			if (buffer[i] == '\n')
+				buffer[i] = 0;
+			i += strlen ("RC_DEFAULTLEVEL=") + 2;
+			line = xmalloc (sizeof (char) * i);
+			snprintf (line, i, "RC_DEFAULTLEVEL=%s", buffer);
+			rc_strlist_add (&env, line);
+			free (line);
+		}
+		fclose (fp);
+	} else
+		rc_strlist_add (&env, "RC_DEFAULTLEVEL=" RC_LEVEL_DEFAULT);
+
+
+#ifdef __linux__
+	/* Linux can run some funky stuff like Xen, VServer, UML, etc
+	   We store this special system in RC_SYS so our scripts run fast */
+	memset (sys, 0, sizeof (sys));
+
+	if (exists ("/proc/xen")) {
+		if ((fp = fopen ("/proc/xen/capabilities", "r"))) {
+			fclose (fp);
+			if (file_regex ("/proc/xen/capabilities", "control_d"))
+				snprintf (sys, sizeof (sys), "XEN0");
+		}
+		if (! sys[0])
+			snprintf (sys, sizeof (sys), "XENU");
+	} else if (file_regex ("/proc/cpuinfo", "UML")) {
+		snprintf (sys, sizeof (sys), "UML");
+	} else if (file_regex ("/proc/self/status",
+						   "(s_context|VxID|envID):[[:space:]]*[1-9]"))
+	{
+		snprintf (sys, sizeof (sys), "VPS");
+	}
+
+	if (sys[0]) {
+		i = strlen ("RC_SYS=") + strlen (sys) + 2;
+		line = xmalloc (sizeof (char) * i);
+		snprintf (line, i, "RC_SYS=%s", sys);
+		rc_strlist_add (&env, line);
+		free (line);
+	}
+
+#endif
+
+	/* Some scripts may need to take a different code path if Linux/FreeBSD, etc
+	   To save on calling uname, we store it in an environment variable */
+	if (uname (&uts) == 0) {
+		i = strlen ("RC_UNAME=") + strlen (uts.sysname) + 2;
+		line = xmalloc (sizeof (char) * i);
+		snprintf (line, i, "RC_UNAME=%s", uts.sysname);
+		rc_strlist_add (&env, line);
+		free (line);
+	}
+
+	/* Be quiet or verbose as necessary */
+	if ((p = rc_conf_value ("rc_quiet"))) {
+		i = strlen ("EINFO_QUIET=") + strlen (p) + 1;
+		line = xmalloc (sizeof (char) * i);
+		snprintf (line, i, "EINFO_QUIET=%s", p);
+		rc_strlist_add (&env, line);
+		free (line);
+	}
+	if ((p = rc_conf_value ("rc_verbose"))) {
+		i = strlen ("EINFO_VERBOSE=") + strlen (p) + 1;
+		line = xmalloc (sizeof (char) * i);
+		snprintf (line, i, "EINFO_VERBOSE=%s", p);
+		rc_strlist_add (&env, line);
+		free (line);
+	}
+
+	errno = 0;
+	if ((! rc_conf_yesno ("rc_color") && errno == 0) ||
+		rc_conf_yesno ("rc_nocolor"))
+		rc_strlist_add (&env, "EINFO_COLOR=no");
+
+	free (runlevel);
+	return (env);
+}