trunk/src/rc-misc.c

/*
   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);
}
1	/*
2	librc-misc.c
3	rc misc functions
4	Copyright 2007 Gentoo Foundation
5	*/
6
7	#ifdef __linux__
8	#include <sys/sysinfo.h>
9	#endif
10
11	#include <sys/utsname.h>
12	#include <limits.h>
13	#include <regex.h>
14	#include <stdio.h>
15	#include <stdlib.h>
16	#include <string.h>
17
18	#include "rc.h"
19	#include "rc-misc.h"
20	#include "strlist.h"
21
22	#define PROFILE_ENV "/etc/profile.env"
23	#define SYS_WHITELIST RC_LIBDIR "/conf.d/env_whitelist"
24	#define USR_WHITELIST "/etc/conf.d/env_whitelist"
25	#define RC_CONFIG "/etc/conf.d/rc"
26
27	#define PATH_PREFIX RC_LIBDIR "/bin:/bin:/sbin:/usr/bin:/usr/sbin"
28
29	char **env_filter (void)
30	{
31	char **env = NULL;
32	char **whitelist = NULL;
33	char *env_name = NULL;
34	char **profile = NULL;
35	int count = 0;
36	bool got_path = false;
37	char *env_var;
38	int env_len;
39	char *p;
40	char *token;
41	char *sep;
42	char *e;
43	int pplen = strlen (PATH_PREFIX);
44
45	whitelist = rc_config_list (SYS_WHITELIST);
46	if (! whitelist)
47	fprintf (stderr, "system environment whitelist (" SYS_WHITELIST ") missing\n");
48
49	env = rc_config_list (USR_WHITELIST);
50	rc_strlist_join (&whitelist, env);
51	rc_strlist_free (env);
52	env = NULL;
53
54	if (! whitelist)
55	return (NULL);
56
57	if (rc_exists (PROFILE_ENV))
58	profile = rc_config_load (PROFILE_ENV);
59
60	STRLIST_FOREACH (whitelist, env_name, count) {
61	char *space = strchr (env_name, ' ');
62	if (space)
63	*space = 0;
64
65	env_var = getenv (env_name);
66
67	if (! env_var && profile) {
68	env_len = strlen (env_name) + strlen ("export ") + 1;
69	p = rc_xmalloc (sizeof (char ) env_len);
70	snprintf (p, env_len, "export %s", env_name);
71	env_var = rc_config_value (profile, p);
72	free (p);
73	}
74
75	if (! env_var)
76	continue;
77
78	/* Ensure our PATH is prefixed with the system locations first
79	for a little extra security */
80	if (strcmp (env_name, "PATH") == 0 &&
81	strncmp (PATH_PREFIX, env_var, pplen) != 0)
82	{
83	got_path = true;
84	env_len = strlen (env_name) + strlen (env_var) + pplen + 2;
85	e = p = rc_xmalloc (sizeof (char ) env_len);
86	p += snprintf (e, env_len, "%s=%s", env_name, PATH_PREFIX);
87
88	/* Now go through the env var and only add bits not in our PREFIX */
89	sep = env_var;
90	while ((token = strsep (&sep, ":"))) {
91	char *np = rc_xstrdup (PATH_PREFIX);
92	char *npp = np;
93	char *tok = NULL;
94	while ((tok = strsep (&npp, ":")))
95	if (strcmp (tok, token) == 0)
96	break;
97	if (! tok)
98	p += snprintf (p, env_len - (p - e), ":%s", token);
99	free (np);
100	}
101	*p++ = 0;
102	} else {
103	env_len = strlen (env_name) + strlen (env_var) + 2;
104	e = rc_xmalloc (sizeof (char ) env_len);
105	snprintf (e, env_len, "%s=%s", env_name, env_var);
106	}
107
108	rc_strlist_add (&env, e);
109	free (e);
110	}
111
112	/* We filtered the env but didn't get a PATH? Very odd.
113	However, we do need a path, so use a default. */
114	if (! got_path) {
115	env_len = strlen ("PATH=") + strlen (PATH_PREFIX) + 2;
116	p = rc_xmalloc (sizeof (char ) env_len);
117	snprintf (p, env_len, "PATH=%s", PATH_PREFIX);
118	rc_strlist_add (&env, p);
119	free (p);
120	}
121
122	rc_strlist_free (whitelist);
123	rc_strlist_free (profile);
124
125	return (env);
126	}
127
128	/* Other systems may need this at some point, but for now it's Linux only */
129	#ifdef __linux__
130	static bool file_regex (const char file, const char regex)
131	{
132	FILE *fp;
133	char buffer[RC_LINEBUFFER];
134	regex_t re;
135	bool retval = false;
136	int result;
137
138	if (! (fp = fopen (file, "r")))
139	return (false);
140
141	if ((result = regcomp (&re, regex, REG_EXTENDED \| REG_NOSUB)) != 0) {
142	fclose (fp);
143	regerror (result, &re, buffer, sizeof (buffer));
144	fprintf (stderr, "file_regex: %s", buffer);
145	return (false);
146	}
147
148	while (fgets (buffer, RC_LINEBUFFER, fp)) {
149	if (regexec (&re, buffer, 0, NULL, 0) == 0)
150	{
151	retval = true;
152	break;
153	}
154	}
155	fclose (fp);
156	regfree (&re);
157
158	return (retval);
159	}
160	#endif
161
162	char **env_config (void)
163	{
164	char **env = NULL;
165	char *line;
166	int i;
167	char *p;
168	char **config;
169	char *e;
170	#ifdef __linux__
171	char sys[6];
172	#endif
173	struct utsname uts;
174	bool has_net_fs_list = false;
175	FILE *fp;
176	char buffer[PATH_MAX];
177	char *runlevel = rc_runlevel_get ();
178
179	/* Don't trust environ for softlevel yet */
180	snprintf (buffer, PATH_MAX, "%s.%s", RC_CONFIG, runlevel);
181	if (rc_exists (buffer))
182	config = rc_config_load (buffer);
183	else
184	config = rc_config_load (RC_CONFIG);
185
186	STRLIST_FOREACH (config, line, i) {
187	p = strchr (line, '=');
188	if (! p)
189	continue;
190
191	*p = 0;
192	e = getenv (line);
193	if (! e) {
194	*p = '=';
195	rc_strlist_add (&env, line);
196	} else {
197	int len = strlen (line) + strlen (e) + 2;
198	char new = rc_xmalloc (sizeof (char ) * len);
199	snprintf (new, len, "%s=%s", line, e);
200	rc_strlist_add (&env, new);
201	free (new);
202	}
203	}
204	rc_strlist_free (config);
205
206	/* One char less to drop the trailing / */
207	i = strlen ("RC_LIBDIR=") + strlen (RC_LIBDIR) + 1;
208	line = rc_xmalloc (sizeof (char ) i);
209	snprintf (line, i, "RC_LIBDIR=" RC_LIBDIR);
210	rc_strlist_add (&env, line);
211	free (line);
212
213	/* One char less to drop the trailing / */
214	i = strlen ("RC_SVCDIR=") + strlen (RC_SVCDIR) + 1;
215	line = rc_xmalloc (sizeof (char ) i);
216	snprintf (line, i, "RC_SVCDIR=" RC_SVCDIR);
217	rc_strlist_add (&env, line);
218	free (line);
219
220	rc_strlist_add (&env, "RC_BOOTLEVEL=" RC_LEVEL_BOOT);
221
222	i = strlen ("RC_SOFTLEVEL=") + strlen (runlevel) + 1;
223	line = rc_xmalloc (sizeof (char ) i);
224	snprintf (line, i, "RC_SOFTLEVEL=%s", runlevel);
225	rc_strlist_add (&env, line);
226	free (line);
227
228	if ((fp = fopen (RC_KSOFTLEVEL, "r"))) {
229	memset (buffer, 0, sizeof (buffer));
230	if (fgets (buffer, sizeof (buffer), fp)) {
231	i = strlen (buffer) - 1;
232	if (buffer[i] == '\n')
233	buffer[i] = 0;
234	i += strlen ("RC_DEFAULTLEVEL=") + 2;
235	line = rc_xmalloc (sizeof (char ) i);
236	snprintf (line, i, "RC_DEFAULTLEVEL=%s", buffer);
237	rc_strlist_add (&env, line);
238	free (line);
239	}
240	fclose (fp);
241	} else
242	rc_strlist_add (&env, "RC_DEFAULTLEVEL=" RC_LEVEL_DEFAULT);
243
244
245	#ifdef __linux__
246	/* Linux can run some funky stuff like Xen, VServer, UML, etc
247	We store this special system in RC_SYS so our scripts run fast */
248	memset (sys, 0, sizeof (sys));
249
250	if (rc_exists ("/proc/xen")) {
251	if ((fp = fopen ("/proc/xen/capabilities", "r"))) {
252	fclose (fp);
253	if (file_regex ("/proc/xen/capabilities", "control_d"))
254	snprintf (sys, sizeof (sys), "XENU");
255	}
256	if (! sys[0])
257	snprintf (sys, sizeof (sys), "XEN0");
258	} else if (file_regex ("/proc/cpuinfo", "UML")) {
259	snprintf (sys, sizeof (sys), "UML");
260	} else if (file_regex ("/proc/self/status",
261	"(s_context\|VxID\|envID):[[:space:]]*[1-9]"))
262	{
263	snprintf (sys, sizeof (sys), "VPS");
264	}
265
266	if (sys[0]) {
267	i = strlen ("RC_SYS=") + strlen (sys) + 2;
268	line = rc_xmalloc (sizeof (char ) i);
269	snprintf (line, i, "RC_SYS=%s", sys);
270	rc_strlist_add (&env, line);
271	free (line);
272	}
273
274	#endif
275
276	/* Only add a NET_FS list if not defined */
277	STRLIST_FOREACH (env, line, i)
278	if (strncmp (line, "RC_NET_FS_LIST=", strlen ("RC_NET_FS_LIST=")) == 0) {
279	has_net_fs_list = true;
280	break;
281	}
282
283	if (! has_net_fs_list) {
284	i = strlen ("RC_NET_FS_LIST=") + strlen (RC_NET_FS_LIST_DEFAULT) + 1;
285	line = rc_xmalloc (sizeof (char ) i);
286	snprintf (line, i, "RC_NET_FS_LIST=%s", RC_NET_FS_LIST_DEFAULT);
287	rc_strlist_add (&env, line);
288	free (line);
289	}
290
291	/* Some scripts may need to take a different code path if Linux/FreeBSD, etc
292	To save on calling uname, we store it in an environment variable */
293	if (uname (&uts) == 0) {
294	i = strlen ("RC_UNAME=") + strlen (uts.sysname) + 2;
295	line = rc_xmalloc (sizeof (char ) i);
296	snprintf (line, i, "RC_UNAME=%s", uts.sysname);
297	rc_strlist_add (&env, line);
298	free (line);
299	}
300
301	free (runlevel);
302	return (env);
303	}