Move rc_env_filter and rc_env_config out of librc and into rc

1 files changed, 303 insertions, 0 deletions

diff --git a/src/rc-misc.c b/src/rc-misc.c
new file mode 100644
index 00000000..4bae93c7
--- /dev/null
+++ b/src/rc-misc.c
@@ -0,0 +1,303 @@
+/*
+   librc-misc.c
+   rc misc functions
+   Copyright 2007 Gentoo Foundation
+   */
+
+#ifdef __linux__
+#include <sys/sysinfo.h>
+#endif
+
+#include <sys/utsname.h>
+#include <limits.h>
+#include <regex.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_CONFIG       "/etc/conf.d/rc"
+
+#define PATH_PREFIX     RC_LIBDIR "/bin:/bin:/sbin:/usr/bin:/usr/sbin"
+
+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 *p;
+	char *token;
+	char *sep;
+	char *e;
+	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 (rc_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 = rc_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 = rc_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 = rc_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 = rc_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;
+		p = rc_xmalloc (sizeof (char *) * env_len);
+		snprintf (p, env_len, "PATH=%s", PATH_PREFIX);
+		rc_strlist_add (&env, p);
+		free (p);
+	}
+
+	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[RC_LINEBUFFER];
+	regex_t re;
+	bool retval = false;
+	int result;
+
+	if (! (fp = fopen (file, "r")))
+		return (false);
+
+	if ((result = regcomp (&re, regex, REG_EXTENDED | REG_NOSUB)) != 0) {
+		fclose (fp);
+		regerror (result, &re, buffer, sizeof (buffer));
+		fprintf (stderr, "file_regex: %s", buffer);
+		return (false);
+	}
+
+	while (fgets (buffer, RC_LINEBUFFER, fp)) {
+		if (regexec (&re, buffer, 0, NULL, 0) == 0)
+		{
+			retval = true;
+			break;
+		}
+	}
+	fclose (fp);
+	regfree (&re);
+
+	return (retval);
+}
+#endif
+
+char **env_config (void)
+{
+	char **env = NULL;
+	char *line;
+	int i;
+	char *p;
+	char **config;
+	char *e;
+#ifdef __linux__
+	char sys[6];
+#endif
+	struct utsname uts;
+	bool has_net_fs_list = false;
+	FILE *fp;
+	char buffer[PATH_MAX];
+	char *runlevel = rc_runlevel_get ();
+
+	/* Don't trust environ for softlevel yet */
+	snprintf (buffer, PATH_MAX, "%s.%s", RC_CONFIG, runlevel);
+	if (rc_exists (buffer))
+		config = rc_config_load (buffer);
+	else
+		config = rc_config_load (RC_CONFIG);
+
+	STRLIST_FOREACH (config, line, i) {
+		p = strchr (line, '=');
+		if (! p)
+			continue;
+
+		*p = 0;
+		e = getenv (line);
+		if (! e) {
+			*p = '=';
+			rc_strlist_add (&env, line);
+		} else {
+			int len = strlen (line) + strlen (e) + 2;
+			char *new = rc_xmalloc (sizeof (char *) * len);
+			snprintf (new, len, "%s=%s", line, e);
+			rc_strlist_add (&env, new);
+			free (new);
+		}
+	}
+	rc_strlist_free (config);
+
+	/* One char less to drop the trailing / */
+	i = strlen ("RC_LIBDIR=") + strlen (RC_LIBDIR) + 1;
+	line = rc_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 = rc_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 = rc_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 = rc_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 (rc_exists ("/proc/xen")) {
+		if ((fp = fopen ("/proc/xen/capabilities", "r"))) {
+			fclose (fp);
+			if (file_regex ("/proc/xen/capabilities", "control_d"))
+				snprintf (sys, sizeof (sys), "XENU");
+		}
+		if (! sys[0])
+			snprintf (sys, sizeof (sys), "XEN0");
+	} 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 = rc_xmalloc (sizeof (char *) * i);
+		snprintf (line, i, "RC_SYS=%s", sys);
+		rc_strlist_add (&env, line);
+		free (line);
+	}
+
+#endif
+
+	/* Only add a NET_FS list if not defined */
+	STRLIST_FOREACH (env, line, i)
+		if (strncmp (line, "RC_NET_FS_LIST=", strlen ("RC_NET_FS_LIST=")) == 0) {
+			has_net_fs_list = true;
+			break;
+		}
+
+	if (! has_net_fs_list) {
+		i = strlen ("RC_NET_FS_LIST=") + strlen (RC_NET_FS_LIST_DEFAULT) + 1;
+		line = rc_xmalloc (sizeof (char *) * i);
+		snprintf (line, i, "RC_NET_FS_LIST=%s", RC_NET_FS_LIST_DEFAULT);
+		rc_strlist_add (&env, line);
+		free (line);
+	}
+
+	/* 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 = rc_xmalloc (sizeof (char *) * i);
+		snprintf (line, i, "RC_UNAME=%s", uts.sysname);
+		rc_strlist_add (&env, line);
+		free (line);
+	}
+
+	free (runlevel);
+	return (env);
+}