hush/procps/fuser.c

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/* vi: set sw=4 ts=4: */
/*
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* tiny fuser implementation
*
* Copyright 2004 Tony J. White
*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#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;
struct globals {
pid_list *pid_list_head;
inode_list *inode_list_head;
};
#define G (*(struct globals*)&bb_common_bufsiz1)
#define INIT_G() do { } while (0)
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 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(path);
}
static void add_pid(const pid_t pid)
{
pid_list **curr = &G.pid_list_head;
while (*curr) {
if ((*curr)->pid == pid)
return;
curr = &(*curr)->next;
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}
*curr = xzalloc(sizeof(pid_list));
(*curr)->pid = pid;
}
static void add_inode(const struct stat *st)
{
inode_list **curr = &G.inode_list_head;
while (*curr) {
if ((*curr)->dev == st->st_dev
&& (*curr)->inode == st->st_ino
) {
return;
}
curr = &(*curr)->next;
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}
*curr = xzalloc(sizeof(inode_list));
(*curr)->dev = st->st_dev;
(*curr)->inode = st->st_ino;
}
static void scan_proc_net(const char *path, unsigned port)
{
char line[MAX_LINE + 1];
long long uint64_inode;
unsigned tmp_port;
FILE *f;
struct stat st;
st.st_dev = find_socket_dev();
f = fopen_for_read(path);
if (!f)
return;
while (fgets(line, MAX_LINE, f)) {
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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) {
st.st_ino = uint64_inode;
add_inode(&st);
}
}
}
fclose(f);
}
static int search_dev_inode(const struct stat *st)
{
inode_list *ilist = G.inode_list_head;
while (ilist) {
if (ilist->dev == st->st_dev) {
if (option_mask32 & OPT_MOUNT)
return 1;
if (ilist->inode == st->st_ino)
return 1;
}
ilist = ilist->next;
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}
return 0;
}
static void scan_pid_maps(const char *fname, pid_t pid)
{
FILE *file;
char line[MAX_LINE + 1];
int major, minor;
long long uint64_inode;
struct stat st;
file = fopen_for_read(fname);
if (!file)
return;
while (fgets(line, MAX_LINE, file)) {
if (sscanf(line, "%*s %*s %*s %x:%x %llu", &major, &minor, &uint64_inode) != 3)
continue;
st.st_ino = uint64_inode;
if (major == 0 && minor == 0 && st.st_ino == 0)
continue;
st.st_dev = makedev(major, minor);
if (search_dev_inode(&st))
add_pid(pid);
}
fclose(file);
}
static void scan_link(const char *lname, pid_t pid)
{
struct stat st;
if (stat(lname, &st) >= 0) {
if (search_dev_inode(&st))
add_pid(pid);
}
}
static void scan_dir_links(const char *dname, pid_t pid)
{
DIR *d;
struct dirent *de;
char *lname;
d = opendir(dname);
if (!d)
return;
while ((de = readdir(d)) != NULL) {
lname = concat_subpath_file(dname, de->d_name);
if (lname == NULL)
continue;
scan_link(lname, pid);
free(lname);
}
closedir(d);
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}
/* NB: does chdir internally */
static void scan_proc_pids(void)
{
DIR *d;
struct dirent *de;
pid_t pid;
xchdir("/proc");
d = opendir("/proc");
if (!d)
return;
while ((de = readdir(d)) != NULL) {
pid = (pid_t)bb_strtou(de->d_name, NULL, 10);
if (errno)
continue;
if (chdir(de->d_name) < 0)
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continue;
scan_link("cwd", pid);
scan_link("exe", pid);
scan_link("root", pid);
scan_dir_links("fd", pid);
scan_dir_links("lib", pid);
scan_dir_links("mmap", pid);
scan_pid_maps("maps", pid);
xchdir("/proc");
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}
closedir(d);
}
int fuser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int fuser_main(int argc UNUSED_PARAM, char **argv)
{
pid_list *plist;
pid_t mypid;
char **pp;
struct stat st;
unsigned port;
int opt;
int exitcode;
int killsig;
/*
fuser [OPTIONS] FILE or PORT/PROTO
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 Don't display PIDs
-k Kill found processes
-SIGNAL Signal to send (default: KILL)
*/
/* Handle -SIGNAL. Oh my... */
killsig = SIGKILL; /* yes, the default is not 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_complementary = "-1"; /* at least one param */
opt = getopt32(argv, OPTION_STRING);
argv += optind;
pp = argv;
while (*pp) {
char *path = parse_net_arg(*pp, &port);
if (path) { /* PORT/PROTO */
scan_proc_net(path, port);
free(path);
} else { /* FILE */
xstat(*pp, &st);
add_inode(&st);
}
pp++;
}
scan_proc_pids(); /* changes dir to "/proc" */
mypid = getpid();
plist = G.pid_list_head;
while (1) {
if (!plist)
return EXIT_FAILURE;
if (plist->pid != mypid)
break;
plist = plist->next;
}
exitcode = EXIT_SUCCESS;
do {
if (plist->pid != mypid) {
if (opt & OPT_KILL) {
if (kill(plist->pid, killsig) != 0) {
bb_perror_msg("kill pid %u", (unsigned)plist->pid);
exitcode = EXIT_FAILURE;
}
}
if (!(opt & OPT_SILENT)) {
printf("%u ", (unsigned)plist->pid);
}
}
plist = plist->next;
} while (plist);
if (!(opt & (OPT_SILENT))) {
bb_putchar('\n');
}
return exitcode;
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}