busybox/procps/fuser.c

/* vi: set sw=4 ts=4: */
/*
 * tiny fuser implementation
 *
 * Copyright 2004 Tony J. White
 *
 * May be distributed under the conditions of the
 * GNU Library General Public License
 */

#include "libbb.h"

#define MAX_LINE 255

#define OPTION_STRING "mks64"
enum {
	OPT_MOUNT  = (1 << 0),
	OPT_KILL   = (1 << 1),
	OPT_SILENT = (1 << 2),
	OPT_IP6    = (1 << 3),
	OPT_IP4    = (1 << 4),
};

typedef struct inode_list {
	struct inode_list *next;
	ino_t inode;
	dev_t dev;
} inode_list;

typedef struct pid_list {
	struct pid_list *next;
	pid_t pid;
} pid_list;

static dev_t find_socket_dev(void)
{
	int fd = socket(AF_INET, SOCK_DGRAM, 0);
	if (fd >= 0) {
		struct stat buf;
		int r = fstat(fd, &buf);
		close(fd);
		if (r == 0)
			return buf.st_dev;
	}
	return 0;
}

static int file_to_dev_inode(const char *filename, dev_t *dev, ino_t *inode)
{
	struct stat f_stat;
	if (stat(filename, &f_stat))
		return 0;
	*inode = f_stat.st_ino;
	*dev = f_stat.st_dev;
	return 1;
}

static char *parse_net_arg(const char *arg, unsigned *port)
{
	char path[20], tproto[5];

	if (sscanf(arg, "%u/%4s", port, tproto) != 2)
		return NULL;
	sprintf(path, "/proc/net/%s", tproto);
	if (access(path, R_OK) != 0)
		return NULL;
	return xstrdup(tproto);
}

static pid_list *add_pid(pid_list *plist, pid_t pid)
{
	pid_list *curr = plist;
	while (curr != NULL) {
		if (curr->pid == pid)
			return plist;
		curr = curr->next;
	}
	curr = xmalloc(sizeof(pid_list));
	curr->pid = pid;
	curr->next = plist;
	return curr;
}

static inode_list *add_inode(inode_list *ilist, dev_t dev, ino_t inode)
{
	inode_list *curr = ilist;
	while (curr != NULL) {
		if (curr->inode == inode && curr->dev == dev)
			return ilist;
		curr = curr->next;
	}
	curr = xmalloc(sizeof(inode_list));
	curr->dev = dev;
	curr->inode = inode;
	curr->next = ilist;
	return curr;
}

static inode_list *scan_proc_net(const char *proto,
				unsigned port, inode_list *ilist)
{
	char path[20], line[MAX_LINE + 1];
	ino_t tmp_inode;
	dev_t tmp_dev;
	long long uint64_inode;
	unsigned tmp_port;
	FILE *f;

	tmp_dev = find_socket_dev();

	sprintf(path, "/proc/net/%s", proto);
	f = fopen_for_read(path);
	if (!f)
		return ilist;

	while (fgets(line, MAX_LINE, f)) {
		char addr[68];
		if (sscanf(line, "%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x %*x:%*x "
				"%*x:%*x %*x %*d %*d %llu",
				addr, &tmp_port, &uint64_inode) == 3
		) {
			int len = strlen(addr);
			if (len == 8 && (option_mask32 & OPT_IP6))
				continue;
			if (len > 8 && (option_mask32 & OPT_IP4))
				continue;
			if (tmp_port == port) {
				tmp_inode = uint64_inode;
				ilist = add_inode(ilist, tmp_dev, tmp_inode);
			}
		}
	}
	fclose(f);
	return ilist;
}

static int search_dev_inode(inode_list *ilist, dev_t dev, ino_t inode)
{
	while (ilist) {
		if (ilist->dev == dev) {
			if (option_mask32 & OPT_MOUNT)
				return 1;
			if (ilist->inode == inode)
				return 1;
		}
		ilist = ilist->next;
	}
	return 0;
}

static pid_list *scan_pid_maps(const char *fname, pid_t pid,
				inode_list *ilist, pid_list *plist)
{
	FILE *file;
	char line[MAX_LINE + 1];
	int major, minor;
	ino_t inode;
	long long uint64_inode;
	dev_t dev;

	file = fopen_for_read(fname);
	if (!file)
		return plist;
	while (fgets(line, MAX_LINE, file)) {
		if (sscanf(line, "%*s %*s %*s %x:%x %llu", &major, &minor, &uint64_inode) != 3)
			continue;
		inode = uint64_inode;
		if (major == 0 && minor == 0 && inode == 0)
			continue;
		dev = makedev(major, minor);
		if (search_dev_inode(ilist, dev, inode))
			plist = add_pid(plist, pid);
	}
	fclose(file);
	return plist;
}

static pid_list *scan_link(const char *lname, pid_t pid,
				inode_list *ilist, pid_list *plist)
{
	ino_t inode;
	dev_t dev;

	if (!file_to_dev_inode(lname, &dev, &inode))
		return plist;
	if (search_dev_inode(ilist, dev, inode))
		plist = add_pid(plist, pid);
	return plist;
}

static pid_list *scan_dir_links(const char *dname, pid_t pid,
				inode_list *ilist, pid_list *plist)
{
	DIR *d;
	struct dirent *de;
	char *lname;

	d = opendir(dname);
	if (!d)
		return plist;
	while ((de = readdir(d)) != NULL) {
		lname = concat_subpath_file(dname, de->d_name);
		if (lname == NULL)
			continue;
		plist = scan_link(lname, pid, ilist, plist);
		free(lname);
	}
	closedir(d);
	return plist;
}

/* NB: does chdir internally */
static pid_list *scan_proc_pids(inode_list *ilist)
{
	DIR *d;
	struct dirent *de;
	pid_t pid;
	pid_list *plist;

	xchdir("/proc");
	d = opendir("/proc");
	if (!d)
		return NULL;

	plist = NULL;
	while ((de = readdir(d)) != NULL) {
		pid = (pid_t)bb_strtou(de->d_name, NULL, 10);
		if (errno)
			continue;
		if (chdir(de->d_name) < 0)
			continue;
		plist = scan_link("cwd", pid, ilist, plist);
		plist = scan_link("exe", pid, ilist, plist);
		plist = scan_link("root", pid, ilist, plist);
		plist = scan_dir_links("fd", pid, ilist, plist);
		plist = scan_dir_links("lib", pid, ilist, plist);
		plist = scan_dir_links("mmap", pid, ilist, plist);
		plist = scan_pid_maps("maps", pid, ilist, plist);
		xchdir("/proc");
	}
	closedir(d);
	return plist;
}

static int print_pid_list(pid_list *plist)
{
	while (plist != NULL) {
		printf("%u ", (unsigned)plist->pid);
		plist = plist->next;
	}
	bb_putchar('\n');
	return 1;
}

static int kill_pid_list(pid_list *plist, int sig)
{
	pid_t mypid = getpid();
	int success = 1;

	while (plist != NULL) {
		if (plist->pid != mypid) {
			if (kill(plist->pid, sig) != 0) {
				bb_perror_msg("kill pid %u", (unsigned)plist->pid);
				success = 0;
			}
		}
		plist = plist->next;
	}
	return success;
}

int fuser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int fuser_main(int argc UNUSED_PARAM, char **argv)
{
	pid_list *plist;
	inode_list *ilist;
	char **pp;
	dev_t dev;
	ino_t inode;
	unsigned port;
	int opt;
	int success;
	int killsig;
/*
fuser [options] FILEs or PORT/PROTOs
Find processes which use FILEs or PORTs
        -m      Find processes which use same fs as FILEs
        -4      Search only IPv4 space
        -6      Search only IPv6 space
        -s      Silent: just exit with 0 if any processes are found
        -k      Kill found processes (otherwise display PIDs)
        -SIGNAL Signal to send (default: TERM)
*/
	/* Handle -SIGNAL. Oh my... */
	killsig = SIGTERM;
	pp = argv;
	while (*++pp) {
		char *arg = *pp;
		if (arg[0] != '-')
			continue;
		if (arg[1] == '-' && arg[2] == '\0') /* "--" */
			break;
		if ((arg[1] == '4' || arg[1] == '6') && arg[2] == '\0')
			continue; /* it's "-4" or "-6" */
		opt = get_signum(&arg[1]);
		if (opt < 0)
			continue;
		/* "-SIGNAL" option found. Remove it and bail out */
		killsig = opt;
		do {
			pp[0] = arg = pp[1];
			pp++;
		} while (arg);
		break;
	}

	opt = getopt32(argv, OPTION_STRING);
	argv += optind;

	ilist = NULL;
	pp = argv;
	while (*pp) {
		char *proto = parse_net_arg(*pp, &port);
		if (proto) { /* PORT/PROTO */
			ilist = scan_proc_net(proto, port, ilist);
			free(proto);
		} else { /* FILE */
			if (!file_to_dev_inode(*pp, &dev, &inode))
				bb_perror_msg_and_die("can't open %s", *pp);
			ilist = add_inode(ilist, dev, inode);
		}
		pp++;
	}

	plist = scan_proc_pids(ilist); /* changes dir to "/proc" */

	if (!plist)
		return EXIT_FAILURE;
	success = 1;
	if (opt & OPT_KILL) {
		success = kill_pid_list(plist, killsig);
	} else if (!(opt & OPT_SILENT)) {
		success = print_pid_list(plist);
	}
	return (success != 1); /* 0 == success */
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* tiny fuser implementation
4	*
5	* Copyright 2004 Tony J. White
6	*
7	* May be distributed under the conditions of the
8	* GNU Library General Public License
9	*/
10
11	#include "libbb.h"
12
13	#define MAX_LINE 255
14
15	#define OPTION_STRING "mks64"
16	enum {
17	OPT_MOUNT = (1 << 0),
18	OPT_KILL = (1 << 1),
19	OPT_SILENT = (1 << 2),
20	OPT_IP6 = (1 << 3),
21	OPT_IP4 = (1 << 4),
22	};
23
24	typedef struct inode_list {
25	struct inode_list *next;
26	ino_t inode;
27	dev_t dev;
28	} inode_list;
29
30	typedef struct pid_list {
31	struct pid_list *next;
32	pid_t pid;
33	} pid_list;
34
35	static dev_t find_socket_dev(void)
36	{
37	int fd = socket(AF_INET, SOCK_DGRAM, 0);
38	if (fd >= 0) {
39	struct stat buf;
40	int r = fstat(fd, &buf);
41	close(fd);
42	if (r == 0)
43	return buf.st_dev;
44	}
45	return 0;
46	}
47
48	static int file_to_dev_inode(const char filename, dev_t dev, ino_t *inode)
49	{
50	struct stat f_stat;
51	if (stat(filename, &f_stat))
52	return 0;
53	*inode = f_stat.st_ino;
54	*dev = f_stat.st_dev;
55	return 1;
56	}
57
58	static char parse_net_arg(const char arg, unsigned *port)
59	{
60	char path[20], tproto[5];
61
62	if (sscanf(arg, "%u/%4s", port, tproto) != 2)
63	return NULL;
64	sprintf(path, "/proc/net/%s", tproto);
65	if (access(path, R_OK) != 0)
66	return NULL;
67	return xstrdup(tproto);
68	}
69
70	static pid_list add_pid(pid_list plist, pid_t pid)
71	{
72	pid_list *curr = plist;
73	while (curr != NULL) {
74	if (curr->pid == pid)
75	return plist;
76	curr = curr->next;
77	}
78	curr = xmalloc(sizeof(pid_list));
79	curr->pid = pid;
80	curr->next = plist;
81	return curr;
82	}
83
84	static inode_list add_inode(inode_list ilist, dev_t dev, ino_t inode)
85	{
86	inode_list *curr = ilist;
87	while (curr != NULL) {
88	if (curr->inode == inode && curr->dev == dev)
89	return ilist;
90	curr = curr->next;
91	}
92	curr = xmalloc(sizeof(inode_list));
93	curr->dev = dev;
94	curr->inode = inode;
95	curr->next = ilist;
96	return curr;
97	}
98
99	static inode_list scan_proc_net(const char proto,
100	unsigned port, inode_list *ilist)
101	{
102	char path[20], line[MAX_LINE + 1];
103	ino_t tmp_inode;
104	dev_t tmp_dev;
105	long long uint64_inode;
106	unsigned tmp_port;
107	FILE *f;
108
109	tmp_dev = find_socket_dev();
110
111	sprintf(path, "/proc/net/%s", proto);
112	f = fopen_for_read(path);
113	if (!f)
114	return ilist;
115
116	while (fgets(line, MAX_LINE, f)) {
117	char addr[68];
118	if (sscanf(line, "%d: %64[0-9A-Fa-f]:%x %x:%x %x %x:%x "
119	"%x:%x %x %d %*d %llu",
120	addr, &tmp_port, &uint64_inode) == 3
121	) {
122	int len = strlen(addr);
123	if (len == 8 && (option_mask32 & OPT_IP6))
124	continue;
125	if (len > 8 && (option_mask32 & OPT_IP4))
126	continue;
127	if (tmp_port == port) {
128	tmp_inode = uint64_inode;
129	ilist = add_inode(ilist, tmp_dev, tmp_inode);
130	}
131	}
132	}
133	fclose(f);
134	return ilist;
135	}
136
137	static int search_dev_inode(inode_list *ilist, dev_t dev, ino_t inode)
138	{
139	while (ilist) {
140	if (ilist->dev == dev) {
141	if (option_mask32 & OPT_MOUNT)
142	return 1;
143	if (ilist->inode == inode)
144	return 1;
145	}
146	ilist = ilist->next;
147	}
148	return 0;
149	}
150
151	static pid_list scan_pid_maps(const char fname, pid_t pid,
152	inode_list ilist, pid_list plist)
153	{
154	FILE *file;
155	char line[MAX_LINE + 1];
156	int major, minor;
157	ino_t inode;
158	long long uint64_inode;
159	dev_t dev;
160
161	file = fopen_for_read(fname);
162	if (!file)
163	return plist;
164	while (fgets(line, MAX_LINE, file)) {
165	if (sscanf(line, "%s %s %*s %x:%x %llu", &major, &minor, &uint64_inode) != 3)
166	continue;
167	inode = uint64_inode;
168	if (major == 0 && minor == 0 && inode == 0)
169	continue;
170	dev = makedev(major, minor);
171	if (search_dev_inode(ilist, dev, inode))
172	plist = add_pid(plist, pid);
173	}
174	fclose(file);
175	return plist;
176	}
177
178	static pid_list scan_link(const char lname, pid_t pid,
179	inode_list ilist, pid_list plist)
180	{
181	ino_t inode;
182	dev_t dev;
183
184	if (!file_to_dev_inode(lname, &dev, &inode))
185	return plist;
186	if (search_dev_inode(ilist, dev, inode))
187	plist = add_pid(plist, pid);
188	return plist;
189	}
190
191	static pid_list scan_dir_links(const char dname, pid_t pid,
192	inode_list ilist, pid_list plist)
193	{
194	DIR *d;
195	struct dirent *de;
196	char *lname;
197
198	d = opendir(dname);
199	if (!d)
200	return plist;
201	while ((de = readdir(d)) != NULL) {
202	lname = concat_subpath_file(dname, de->d_name);
203	if (lname == NULL)
204	continue;
205	plist = scan_link(lname, pid, ilist, plist);
206	free(lname);
207	}
208	closedir(d);
209	return plist;
210	}
211
212	/* NB: does chdir internally */
213	static pid_list scan_proc_pids(inode_list ilist)
214	{
215	DIR *d;
216	struct dirent *de;
217	pid_t pid;
218	pid_list *plist;
219
220	xchdir("/proc");
221	d = opendir("/proc");
222	if (!d)
223	return NULL;
224
225	plist = NULL;
226	while ((de = readdir(d)) != NULL) {
227	pid = (pid_t)bb_strtou(de->d_name, NULL, 10);
228	if (errno)
229	continue;
230	if (chdir(de->d_name) < 0)
231	continue;
232	plist = scan_link("cwd", pid, ilist, plist);
233	plist = scan_link("exe", pid, ilist, plist);
234	plist = scan_link("root", pid, ilist, plist);
235	plist = scan_dir_links("fd", pid, ilist, plist);
236	plist = scan_dir_links("lib", pid, ilist, plist);
237	plist = scan_dir_links("mmap", pid, ilist, plist);
238	plist = scan_pid_maps("maps", pid, ilist, plist);
239	xchdir("/proc");
240	}
241	closedir(d);
242	return plist;
243	}
244
245	static int print_pid_list(pid_list *plist)
246	{
247	while (plist != NULL) {
248	printf("%u ", (unsigned)plist->pid);
249	plist = plist->next;
250	}
251	bb_putchar('\n');
252	return 1;
253	}
254
255	static int kill_pid_list(pid_list *plist, int sig)
256	{
257	pid_t mypid = getpid();
258	int success = 1;
259
260	while (plist != NULL) {
261	if (plist->pid != mypid) {
262	if (kill(plist->pid, sig) != 0) {
263	bb_perror_msg("kill pid %u", (unsigned)plist->pid);
264	success = 0;
265	}
266	}
267	plist = plist->next;
268	}
269	return success;
270	}
271
272	int fuser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
273	int fuser_main(int argc UNUSED_PARAM, char **argv)
274	{
275	pid_list *plist;
276	inode_list *ilist;
277	char **pp;
278	dev_t dev;
279	ino_t inode;
280	unsigned port;
281	int opt;
282	int success;
283	int killsig;
284	/*
285	fuser [options] FILEs or PORT/PROTOs
286	Find processes which use FILEs or PORTs
287	-m Find processes which use same fs as FILEs
288	-4 Search only IPv4 space
289	-6 Search only IPv6 space
290	-s Silent: just exit with 0 if any processes are found
291	-k Kill found processes (otherwise display PIDs)
292	-SIGNAL Signal to send (default: TERM)
293	*/
294	/* Handle -SIGNAL. Oh my... */
295	killsig = SIGTERM;
296	pp = argv;
297	while (*++pp) {
298	char arg = pp;
299	if (arg[0] != '-')
300	continue;
301	if (arg[1] == '-' && arg[2] == '\0') /* "--" */
302	break;
303	if ((arg[1] == '4' \|\| arg[1] == '6') && arg[2] == '\0')
304	continue; /* it's "-4" or "-6" */
305	opt = get_signum(&arg[1]);
306	if (opt < 0)
307	continue;
308	/* "-SIGNAL" option found. Remove it and bail out */
309	killsig = opt;
310	do {
311	pp[0] = arg = pp[1];
312	pp++;
313	} while (arg);
314	break;
315	}
316
317	opt = getopt32(argv, OPTION_STRING);
318	argv += optind;
319
320	ilist = NULL;
321	pp = argv;
322	while (*pp) {
323	char proto = parse_net_arg(pp, &port);
324	if (proto) { /* PORT/PROTO */
325	ilist = scan_proc_net(proto, port, ilist);
326	free(proto);
327	} else { /* FILE */
328	if (!file_to_dev_inode(*pp, &dev, &inode))
329	bb_perror_msg_and_die("can't open %s", *pp);
330	ilist = add_inode(ilist, dev, inode);
331	}
332	pp++;
333	}
334
335	plist = scan_proc_pids(ilist); /* changes dir to "/proc" */
336
337	if (!plist)
338	return EXIT_FAILURE;
339	success = 1;
340	if (opt & OPT_KILL) {
341	success = kill_pid_list(plist, killsig);
342	} else if (!(opt & OPT_SILENT)) {
343	success = print_pid_list(plist);
344	}
345	return (success != 1); /* 0 == success */
346	}