trunk/src/mountinfo.c

/*
   mountinfo.c
   Obtains information about mounted filesystems.

   Copyright 2007 Gentoo Foundation
   */

#define APPLET "mountinfo"

#include <sys/types.h>

#if defined(__DragonFly__) || defined(__FreeBSD__) || \
        defined(__NetBSD__) || defined(__OpenBSD__)
#define BSD
#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#endif

#include <errno.h>
#include <getopt.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <regex.h>

#include "builtins.h"
#include "einfo.h"
#include "rc.h"
#include "rc-misc.h"
#include "strlist.h"

typedef enum {
        mount_from,
        mount_to,
        mount_fstype,
        mount_options
} mount_type;

struct args {
        regex_t *node_regex;
        regex_t *skip_node_regex;
        regex_t *fstype_regex;
        regex_t *skip_fstype_regex;
        regex_t *options_regex;
        regex_t *skip_options_regex;
        char **mounts;
        mount_type mount_type;
};

static int process_mount (char ***list, struct args *args,
                                                  char *from, char *to, char *fstype, char *options)
{
        char *p;

        errno = ENOENT;

#ifdef __linux__
        /* Skip the really silly rootfs */
        if (strcmp (fstype, "rootfs") == 0)
                return (-1);
#endif

        if (args->node_regex &&
                regexec (args->node_regex, from, 0, NULL, 0) != 0)
                return (1);
        if (args->skip_node_regex &&
                regexec (args->skip_node_regex, from, 0, NULL, 0) == 0)
                return (1);

        if (args->fstype_regex &&
                regexec (args->fstype_regex, fstype, 0, NULL, 0) != 0)
                return (-1);
        if (args->skip_fstype_regex &&
                regexec (args->skip_fstype_regex, fstype, 0, NULL, 0) == 0)
                return (-1);

        if (args->options_regex &&
                regexec (args->options_regex, options, 0, NULL, 0) != 0)
                return (-1);
        if (args->skip_options_regex &&
                regexec (args->skip_options_regex, options, 0, NULL, 0) == 0)
                return (-1);

        if (args->mounts)   {
                bool found = false;
                int j;
                char *mnt;
                STRLIST_FOREACH (args->mounts, mnt, j)
                        if (strcmp (mnt, to) == 0) {
                                found = true;
                                break;
                        }
                if (! found)
                        return (-1);
        }

        switch (args->mount_type) {
                case mount_from:
                        p = from;
                        break;
                case mount_to:
                        p = to;
                        break;
                case mount_fstype:
                        p = fstype;
                        break;
                case mount_options:
                        p = options;
                        break;
                default:
                        p = NULL;
                        errno = EINVAL;
                        break;
        }

        if (p) {
                errno = 0;
                rc_strlist_addsortc (list, p);
                return (0);
        }

        return (-1);
}

#ifdef BSD 

/* Translate the mounted options to english
 * This is taken directly from FreeBSD mount.c */
static struct opt {
        int o_opt;
        const char *o_name;
} optnames[] = {
        { MNT_ASYNC,        "asynchronous" },
        { MNT_EXPORTED,     "NFS exported" },
        { MNT_LOCAL,        "local" },
        { MNT_NOATIME,      "noatime" },
        { MNT_NOEXEC,       "noexec" },
        { MNT_NOSUID,       "nosuid" },
        { MNT_NOSYMFOLLOW,  "nosymfollow" },
        { MNT_QUOTA,        "with quotas" },
        { MNT_RDONLY,       "read-only" },
        { MNT_SYNCHRONOUS,  "synchronous" },
        { MNT_UNION,        "union" },
        { MNT_NOCLUSTERR,   "noclusterr" },
        { MNT_NOCLUSTERW,   "noclusterw" },
        { MNT_SUIDDIR,      "suiddir" },
        { MNT_SOFTDEP,      "soft-updates" },
        { MNT_MULTILABEL,   "multilabel" },
        { MNT_ACLS,         "acls" },
#ifdef MNT_GJOURNAL
        { MNT_GJOURNAL,     "gjournal" },
#endif
        { 0, NULL }
};

static char **find_mounts (struct args *args)
{
        struct statfs *mnts;
        int nmnts;
        int i;
        char **list = NULL;
        char *options = NULL;
        int flags;
        struct opt *o;

        if ((nmnts = getmntinfo (&mnts, MNT_NOWAIT)) == 0)
                eerrorx ("getmntinfo: %s", strerror (errno));

        for (i = 0; i < nmnts; i++) {
                flags = mnts[i].f_flags & MNT_VISFLAGMASK;
                for (o = optnames; flags && o->o_opt; o++) {
                        if (flags & o->o_opt) {
                                if (! options)
                                        options = rc_xstrdup (o->o_name);
                                else {
                                        char *tmp = NULL;
                                        asprintf (&tmp, "%s, %s", options, o->o_name);
                                        free (options);
                                        options = tmp;
                                }
                        }
                        flags &= ~o->o_opt;
                }

                process_mount (&list, args,
                                           mnts[i].f_mntfromname,
                                           mnts[i].f_mntonname,
                                           mnts[i].f_fstypename,
                                           options);

                free (options);
                options = NULL;
        }

        return (list);
}

#elif defined (__linux__)
static char **find_mounts (struct args *args)
{
        FILE *fp;
        char buffer[PATH_MAX * 3];
        char *p;
        char *from;
        char *to;
        char *fst;
        char *opts;
        char **list = NULL;

        if ((fp = fopen ("/proc/mounts", "r")) == NULL)
                eerrorx ("getmntinfo: %s", strerror (errno));

        while (fgets (buffer, sizeof (buffer), fp)) {
                p = buffer;
                from = strsep (&p, " ");
                to = strsep (&p, " ");
                fst = strsep (&p, " ");
                opts = strsep (&p, " ");

                process_mount (&list, args, from, to, fst, opts);
        }
        fclose (fp);

        return (list);
}

#else
#  error "Operating system not supported!"
#endif

static regex_t *get_regex (char *string)
{
        regex_t *reg = rc_xmalloc (sizeof (regex_t));
        int result;
        char buffer[256];

        if ((result = regcomp (reg, string, REG_EXTENDED | REG_NOSUB)) != 0)
        {
                regerror (result, reg, buffer, sizeof (buffer));
                eerrorx ("%s: invalid regex `%s'", APPLET, buffer);
        }

        return (reg);
}

#include "_usage.h"
#define getoptstring "f:F:n:N:o:O:p:P:iqst" getoptstring_COMMON
static struct option longopts[] = {
        { "fstype-regex",        1, NULL, 'f'},
        { "skip-fstype-regex",   1, NULL, 'F'},
        { "node-regex",          1, NULL, 'n'},
        { "skip-node-regex",     1, NULL, 'N'},
        { "options-regex",       1, NULL, 'o'},
        { "skip-options-regex",  1, NULL, 'O'},
        { "point-regex",         1, NULL, 'p'},
        { "skip-point-regex",    1, NULL, 'P'},
        { "options",             0, NULL, 'i'},
        { "fstype",              0, NULL, 's'},
        { "node",                0, NULL, 't'},
        { "quiet",               0, NULL, 'q'},
        longopts_COMMON
        { NULL,             0, NULL, 0}
};
#include "_usage.c"

int mountinfo (int argc, char **argv)
{
        int i;
        struct args args;
        regex_t *point_regex = NULL;
        regex_t *skip_point_regex = NULL;
        char **nodes = NULL;
        char *n;
        int opt;
        bool quiet = false;
        int result;

#define DO_REG(_var) \
        if (_var) free (_var); \
        _var = get_regex (optarg);

        memset (&args, 0, sizeof (struct args));
        args.mount_type = mount_to;

        while ((opt = getopt_long (argc, argv, getoptstring,
                                                           longopts, (int *) 0)) != -1)
        {
                switch (opt) {
                        case 'f':
                                DO_REG (args.fstype_regex);
                                break;
                        case 'F':
                                DO_REG (args.skip_fstype_regex);
                                break;
                        case 'n':
                                DO_REG (args.node_regex);
                                break;
                        case 'N':
                                DO_REG (args.skip_node_regex);
                                break;
                        case 'o':
                                DO_REG (args.options_regex);
                                break;
                        case 'O':
                                DO_REG (args.skip_options_regex);
                                break;
                        case 'p':
                                DO_REG (point_regex);
                                break;
                        case 'P':
                                DO_REG (skip_point_regex);
                                break;
                        case 'i':
                                args.mount_type = mount_options;
                                break;
                        case 's':
                                args.mount_type = mount_fstype;
                                break;
                        case 't':
                                args.mount_type = mount_from;
                                break;
                        case 'q':
                                quiet = true;
                                break;

                                case_RC_COMMON_GETOPT
                }
        }

        while (optind < argc) {
                if (argv[optind][0] != '/')
                        eerrorx ("%s: `%s' is not a mount point", argv[0], argv[optind]);
                rc_strlist_add (&args.mounts, argv[optind++]);
        }

        nodes = find_mounts (&args);

        if (args.fstype_regex)
                regfree (args.fstype_regex);
        if (args.skip_fstype_regex)
                regfree (args.skip_fstype_regex);
        if (args.node_regex)
                regfree (args.node_regex);
        if (args.skip_node_regex)
                regfree (args.skip_node_regex);
        if (args.options_regex)
                regfree (args.options_regex);
        if (args.skip_options_regex)
                regfree (args.skip_options_regex);
        
        rc_strlist_reverse (nodes);

        result = EXIT_FAILURE;
        STRLIST_FOREACH (nodes, n, i) {
                if (point_regex && regexec (point_regex, n, 0, NULL, 0) != 0)
                        continue;
                if (skip_point_regex && regexec (skip_point_regex, n, 0, NULL, 0) == 0)
                        continue;
                if (! quiet)
                        printf ("%s\n", n);
                result = EXIT_SUCCESS;
        }
        rc_strlist_free (nodes);

        if (point_regex)
                regfree (point_regex);
        if (skip_point_regex)
                regfree (skip_point_regex);

        exit (result);
}
1	/*
2	mountinfo.c
3	Obtains information about mounted filesystems.
4
5	Copyright 2007 Gentoo Foundation
6	*/
7
8	#define APPLET "mountinfo"
9
10	#include <sys/types.h>
11
12	#if defined(__DragonFly__) \|\| defined(__FreeBSD__) \|\| \
13	defined(__NetBSD__) \|\| defined(__OpenBSD__)
14	#define BSD
15	#include <sys/param.h>
16	#include <sys/ucred.h>
17	#include <sys/mount.h>
18	#endif
19
20	#include <errno.h>
21	#include <getopt.h>
22	#include <limits.h>
23	#include <stdio.h>
24	#include <stdlib.h>
25	#include <string.h>
26	#include <regex.h>
27
28	#include "builtins.h"
29	#include "einfo.h"
30	#include "rc.h"
31	#include "rc-misc.h"
32	#include "strlist.h"
33
34	typedef enum {
35	mount_from,
36	mount_to,
37	mount_fstype,
38	mount_options
39	} mount_type;
40
41	struct args {
42	regex_t *node_regex;
43	regex_t *skip_node_regex;
44	regex_t *fstype_regex;
45	regex_t *skip_fstype_regex;
46	regex_t *options_regex;
47	regex_t *skip_options_regex;
48	char **mounts;
49	mount_type mount_type;
50	};
51
52	static int process_mount (char **list, struct args args,
53	char from, char to, char fstype, char options)
54	{
55	char *p;
56
57	errno = ENOENT;
58
59	#ifdef __linux__
60	/* Skip the really silly rootfs */
61	if (strcmp (fstype, "rootfs") == 0)
62	return (-1);
63	#endif
64
65	if (args->node_regex &&
66	regexec (args->node_regex, from, 0, NULL, 0) != 0)
67	return (1);
68	if (args->skip_node_regex &&
69	regexec (args->skip_node_regex, from, 0, NULL, 0) == 0)
70	return (1);
71
72	if (args->fstype_regex &&
73	regexec (args->fstype_regex, fstype, 0, NULL, 0) != 0)
74	return (-1);
75	if (args->skip_fstype_regex &&
76	regexec (args->skip_fstype_regex, fstype, 0, NULL, 0) == 0)
77	return (-1);
78
79	if (args->options_regex &&
80	regexec (args->options_regex, options, 0, NULL, 0) != 0)
81	return (-1);
82	if (args->skip_options_regex &&
83	regexec (args->skip_options_regex, options, 0, NULL, 0) == 0)
84	return (-1);
85
86	if (args->mounts) {
87	bool found = false;
88	int j;
89	char *mnt;
90	STRLIST_FOREACH (args->mounts, mnt, j)
91	if (strcmp (mnt, to) == 0) {
92	found = true;
93	break;
94	}
95	if (! found)
96	return (-1);
97	}
98
99	switch (args->mount_type) {
100	case mount_from:
101	p = from;
102	break;
103	case mount_to:
104	p = to;
105	break;
106	case mount_fstype:
107	p = fstype;
108	break;
109	case mount_options:
110	p = options;
111	break;
112	default:
113	p = NULL;
114	errno = EINVAL;
115	break;
116	}
117
118	if (p) {
119	errno = 0;
120	rc_strlist_addsortc (list, p);
121	return (0);
122	}
123
124	return (-1);
125	}
126
127	#ifdef BSD
128
129	/* Translate the mounted options to english
130	* This is taken directly from FreeBSD mount.c */
131	static struct opt {
132	int o_opt;
133	const char *o_name;
134	} optnames[] = {
135	{ MNT_ASYNC, "asynchronous" },
136	{ MNT_EXPORTED, "NFS exported" },
137	{ MNT_LOCAL, "local" },
138	{ MNT_NOATIME, "noatime" },
139	{ MNT_NOEXEC, "noexec" },
140	{ MNT_NOSUID, "nosuid" },
141	{ MNT_NOSYMFOLLOW, "nosymfollow" },
142	{ MNT_QUOTA, "with quotas" },
143	{ MNT_RDONLY, "read-only" },
144	{ MNT_SYNCHRONOUS, "synchronous" },
145	{ MNT_UNION, "union" },
146	{ MNT_NOCLUSTERR, "noclusterr" },
147	{ MNT_NOCLUSTERW, "noclusterw" },
148	{ MNT_SUIDDIR, "suiddir" },
149	{ MNT_SOFTDEP, "soft-updates" },
150	{ MNT_MULTILABEL, "multilabel" },
151	{ MNT_ACLS, "acls" },
152	#ifdef MNT_GJOURNAL
153	{ MNT_GJOURNAL, "gjournal" },
154	#endif
155	{ 0, NULL }
156	};
157
158	static char *find_mounts (struct args args)
159	{
160	struct statfs *mnts;
161	int nmnts;
162	int i;
163	char **list = NULL;
164	char *options = NULL;
165	int flags;
166	struct opt *o;
167
168	if ((nmnts = getmntinfo (&mnts, MNT_NOWAIT)) == 0)
169	eerrorx ("getmntinfo: %s", strerror (errno));
170
171	for (i = 0; i < nmnts; i++) {
172	flags = mnts[i].f_flags & MNT_VISFLAGMASK;
173	for (o = optnames; flags && o->o_opt; o++) {
174	if (flags & o->o_opt) {
175	if (! options)
176	options = rc_xstrdup (o->o_name);
177	else {
178	char *tmp = NULL;
179	asprintf (&tmp, "%s, %s", options, o->o_name);
180	free (options);
181	options = tmp;
182	}
183	}
184	flags &= ~o->o_opt;
185	}
186
187	process_mount (&list, args,
188	mnts[i].f_mntfromname,
189	mnts[i].f_mntonname,
190	mnts[i].f_fstypename,
191	options);
192
193	free (options);
194	options = NULL;
195	}
196
197	return (list);
198	}
199
200	#elif defined (__linux__)
201	static char *find_mounts (struct args args)
202	{
203	FILE *fp;
204	char buffer[PATH_MAX * 3];
205	char *p;
206	char *from;
207	char *to;
208	char *fst;
209	char *opts;
210	char **list = NULL;
211
212	if ((fp = fopen ("/proc/mounts", "r")) == NULL)
213	eerrorx ("getmntinfo: %s", strerror (errno));
214
215	while (fgets (buffer, sizeof (buffer), fp)) {
216	p = buffer;
217	from = strsep (&p, " ");
218	to = strsep (&p, " ");
219	fst = strsep (&p, " ");
220	opts = strsep (&p, " ");
221
222	process_mount (&list, args, from, to, fst, opts);
223	}
224	fclose (fp);
225
226	return (list);
227	}
228
229	#else
230	# error "Operating system not supported!"
231	#endif
232
233	static regex_t get_regex (char string)
234	{
235	regex_t *reg = rc_xmalloc (sizeof (regex_t));
236	int result;
237	char buffer[256];
238
239	if ((result = regcomp (reg, string, REG_EXTENDED \| REG_NOSUB)) != 0)
240	{
241	regerror (result, reg, buffer, sizeof (buffer));
242	eerrorx ("%s: invalid regex `%s'", APPLET, buffer);
243	}
244
245	return (reg);
246	}
247
248	#include "_usage.h"
249	#define getoptstring "f:F:n:N:o:O:p:P:iqst" getoptstring_COMMON
250	static struct option longopts[] = {
251	{ "fstype-regex", 1, NULL, 'f'},
252	{ "skip-fstype-regex", 1, NULL, 'F'},
253	{ "node-regex", 1, NULL, 'n'},
254	{ "skip-node-regex", 1, NULL, 'N'},
255	{ "options-regex", 1, NULL, 'o'},
256	{ "skip-options-regex", 1, NULL, 'O'},
257	{ "point-regex", 1, NULL, 'p'},
258	{ "skip-point-regex", 1, NULL, 'P'},
259	{ "options", 0, NULL, 'i'},
260	{ "fstype", 0, NULL, 's'},
261	{ "node", 0, NULL, 't'},
262	{ "quiet", 0, NULL, 'q'},
263	longopts_COMMON
264	{ NULL, 0, NULL, 0}
265	};
266	#include "_usage.c"
267
268	int mountinfo (int argc, char **argv)
269	{
270	int i;
271	struct args args;
272	regex_t *point_regex = NULL;
273	regex_t *skip_point_regex = NULL;
274	char **nodes = NULL;
275	char *n;
276	int opt;
277	bool quiet = false;
278	int result;
279
280	#define DO_REG(_var) \
281	if (_var) free (_var); \
282	_var = get_regex (optarg);
283
284	memset (&args, 0, sizeof (struct args));
285	args.mount_type = mount_to;
286
287	while ((opt = getopt_long (argc, argv, getoptstring,
288	longopts, (int *) 0)) != -1)
289	{
290	switch (opt) {
291	case 'f':
292	DO_REG (args.fstype_regex);
293	break;
294	case 'F':
295	DO_REG (args.skip_fstype_regex);
296	break;
297	case 'n':
298	DO_REG (args.node_regex);
299	break;
300	case 'N':
301	DO_REG (args.skip_node_regex);
302	break;
303	case 'o':
304	DO_REG (args.options_regex);
305	break;
306	case 'O':
307	DO_REG (args.skip_options_regex);
308	break;
309	case 'p':
310	DO_REG (point_regex);
311	break;
312	case 'P':
313	DO_REG (skip_point_regex);
314	break;
315	case 'i':
316	args.mount_type = mount_options;
317	break;
318	case 's':
319	args.mount_type = mount_fstype;
320	break;
321	case 't':
322	args.mount_type = mount_from;
323	break;
324	case 'q':
325	quiet = true;
326	break;
327
328	case_RC_COMMON_GETOPT
329	}
330	}
331
332	while (optind < argc) {
333	if (argv[optind][0] != '/')
334	eerrorx ("%s: `%s' is not a mount point", argv[0], argv[optind]);
335	rc_strlist_add (&args.mounts, argv[optind++]);
336	}
337
338	nodes = find_mounts (&args);
339
340	if (args.fstype_regex)
341	regfree (args.fstype_regex);
342	if (args.skip_fstype_regex)
343	regfree (args.skip_fstype_regex);
344	if (args.node_regex)
345	regfree (args.node_regex);
346	if (args.skip_node_regex)
347	regfree (args.skip_node_regex);
348	if (args.options_regex)
349	regfree (args.options_regex);
350	if (args.skip_options_regex)
351	regfree (args.skip_options_regex);
352
353	rc_strlist_reverse (nodes);
354
355	result = EXIT_FAILURE;
356	STRLIST_FOREACH (nodes, n, i) {
357	if (point_regex && regexec (point_regex, n, 0, NULL, 0) != 0)
358	continue;
359	if (skip_point_regex && regexec (skip_point_regex, n, 0, NULL, 0) == 0)
360	continue;
361	if (! quiet)
362	printf ("%s\n", n);
363	result = EXIT_SUCCESS;
364	}
365	rc_strlist_free (nodes);
366
367	if (point_regex)
368	regfree (point_regex);
369	if (skip_point_regex)
370	regfree (skip_point_regex);
371
372	exit (result);
373	}