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hush/procps/fuser.c

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/*
* tiny fuser implementation
*
* Copyright 2004 Tony J. White
*
* May be distributed under the conditions of the
* GNU Library General Public License
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <limits.h>
#include <dirent.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include "busybox.h"
#define FUSER_PROC_DIR "/proc"
#define FUSER_MAX_LINE 255
#define FUSER_OPT_MOUNT 1
#define FUSER_OPT_KILL 2
#define FUSER_OPT_SILENT 4
#define FUSER_OPT_IP6 8
#define FUSER_OPT_IP4 16
typedef struct inode_list {
ino_t inode;
dev_t dev;
struct inode_list *next;
} inode_list;
typedef struct pid_list {
pid_t pid;
struct pid_list *next;
} pid_list;
static int fuser_option(char *option)
{
int opt = 0;
if(!(strlen(option))) return 0;
if(option[0] != '-') return 0;
*++option;
while(*option != '\0') {
if(*option == 'm') opt |= FUSER_OPT_MOUNT;
else if(*option == 'k') opt |= FUSER_OPT_KILL;
else if(*option == 's') opt |= FUSER_OPT_SILENT;
else if(*option == '6') opt |= FUSER_OPT_IP6;
else if(*option == '4') opt |= FUSER_OPT_IP4;
else {
bb_error_msg_and_die(
"Unsupported option '%c'", *option);
}
*++option;
}
return opt;
}
static int fuser_file_to_dev_inode(const char *filename,
dev_t *dev, ino_t *inode)
{
struct stat f_stat;
if((stat(filename, &f_stat)) < 0) return 0;
*inode = f_stat.st_ino;
*dev = f_stat.st_dev;
return 1;
}
static int fuser_find_socket_dev(dev_t *dev) {
int fd = socket(PF_INET, SOCK_DGRAM,0);
struct stat buf;
if (fd >= 0 && (fstat(fd, &buf)) == 0) {
*dev = buf.st_dev;
close(fd);
return 1;
}
return 0;
}
static int fuser_parse_net_arg(const char *filename,
const char **proto, int *port)
{
char path[sizeof(FUSER_PROC_DIR)+12], tproto[5];
if((sscanf(filename, "%d/%4s", port, tproto)) != 2) return 0;
sprintf(path, "%s/net/%s", FUSER_PROC_DIR, tproto);
if((access(path, R_OK)) != 0) return 0;
*proto = bb_xstrdup(tproto);
return 1;
}
static int fuser_add_pid(pid_list *plist, pid_t pid)
{
pid_list *curr = NULL, *last = NULL;
if(plist->pid == 0) plist->pid = pid;
curr = plist;
while(curr != NULL) {
if(curr->pid == pid) return 1;
last = curr;
curr = curr->next;
}
curr = xmalloc(sizeof(pid_list));
last->next = curr;
curr->pid = pid;
curr->next = NULL;
return 1;
}
static int fuser_add_inode(inode_list *ilist, dev_t dev, ino_t inode)
{
inode_list *curr = NULL, *last = NULL;
if(!ilist->inode && !ilist->dev) {
ilist->dev = dev;
ilist->inode = inode;
}
curr = ilist;
while(curr != NULL) {
if(curr->inode == inode && curr->dev == dev) return 1;
last = curr;
curr = curr->next;
}
curr = xmalloc(sizeof(inode_list));
last->next = curr;
curr->dev = dev;
curr->inode = inode;
curr->next = NULL;
return 1;
}
static int fuser_scan_proc_net(int opts, const char *proto,
int port, inode_list *ilist)
{
char path[sizeof(FUSER_PROC_DIR)+12], line[FUSER_MAX_LINE+1];
char addr[128];
ino_t tmp_inode;
dev_t tmp_dev;
uint64_t uint64_inode;
int tmp_port;
FILE *f;
if(!fuser_find_socket_dev(&tmp_dev)) tmp_dev = 0;
sprintf(path, "%s/net/%s", FUSER_PROC_DIR, proto);
if (!(f = fopen(path, "r"))) return 0;
while(fgets(line, FUSER_MAX_LINE, f)) {
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) {
if((strlen(addr) == 8) &&
(opts & FUSER_OPT_IP6)) continue;
else if((strlen(addr) > 8) &&
(opts & FUSER_OPT_IP4)) continue;
if(tmp_port == port) {
tmp_inode = uint64_inode;
fuser_add_inode(ilist, tmp_dev, tmp_inode);
}
}
}
fclose(f);
return 1;
}
static int fuser_search_dev_inode(int opts, inode_list *ilist,
dev_t dev, ino_t inode)
{
inode_list *curr;
curr = ilist;
while(curr) {
if((opts & FUSER_OPT_MOUNT) && curr->dev == dev)
return 1;
if(curr->inode == inode && curr->dev == dev)
return 1;
curr = curr->next;
}
return 0;
}
static int fuser_scan_pid_maps(int opts, const char *fname, pid_t pid,
inode_list *ilist, pid_list *plist)
{
FILE *file;
char line[FUSER_MAX_LINE + 1];
int major, minor;
ino_t inode;
uint64_t uint64_inode;
dev_t dev;
if (!(file = fopen(fname, "r"))) return 0;
while (fgets(line, FUSER_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(fuser_search_dev_inode(opts, ilist, dev, inode)) {
fuser_add_pid(plist, pid);
}
}
fclose(file);
return 1;
}
static int fuser_scan_link(int opts, const char *lname, pid_t pid,
inode_list *ilist, pid_list *plist)
{
ino_t inode;
dev_t dev;
if(!fuser_file_to_dev_inode(lname, &dev, &inode)) return 0;
if(fuser_search_dev_inode(opts, ilist, dev, inode))
fuser_add_pid(plist, pid);
return 1;
}
static int fuser_scan_dir_links(int opts, const char *dname, pid_t pid,
inode_list *ilist, pid_list *plist)
{
DIR *d;
struct dirent *de;
char *lname;
if((d = opendir(dname))) {
while((de = readdir(d)) != NULL) {
lname = concat_subpath_file(dname, de->d_name);
if(lname == NULL)
continue;
fuser_scan_link(opts, lname, pid, ilist, plist);
free(lname);
}
closedir(d);
}
else return 0;
return 1;
}
static int fuser_scan_proc_pids(int opts, inode_list *ilist, pid_list *plist)
{
DIR *d;
struct dirent *de;
pid_t pid;
char *dname;
if(!(d = opendir(FUSER_PROC_DIR))) return 0;
while((de = readdir(d)) != NULL) {
pid = (pid_t)atoi(de->d_name);
if(!pid) continue;
dname = concat_subpath_file(FUSER_PROC_DIR, de->d_name);
if(chdir(dname) < 0) {
free(dname);
continue;
}
free(dname);
fuser_scan_link(opts, "cwd", pid, ilist, plist);
fuser_scan_link(opts, "exe", pid, ilist, plist);
fuser_scan_link(opts, "root", pid, ilist, plist);
fuser_scan_dir_links(opts, "fd", pid, ilist, plist);
fuser_scan_dir_links(opts, "lib", pid, ilist, plist);
fuser_scan_dir_links(opts, "mmap", pid, ilist, plist);
fuser_scan_pid_maps(opts, "maps", pid, ilist, plist);
chdir("..");
}
closedir(d);
return 1;
}
static int fuser_print_pid_list(pid_list *plist) {
pid_list *curr;
curr = plist;
if(plist == NULL) return 0;
while(curr != NULL) {
if(curr->pid > 0) printf("%d ", curr->pid);
curr = curr->next;
}
printf("\n");
return 1;
}
static int fuser_kill_pid_list(pid_list *plist, int sig) {
pid_list *curr;
curr = plist;
pid_t mypid = getpid();
int success = 1;
if(plist == NULL) return 0;
while(curr != NULL) {
if(curr->pid > 0 && curr->pid != mypid) {
if (kill(curr->pid, sig) != 0) {
bb_perror_msg(
"Could not kill pid '%d'", curr->pid);
success = 0;
}
}
curr = curr->next;
}
return success;
}
extern int fuser_main(int argc, char **argv) {
int port, i, optn;
int* fni; /* file name indexes of argv */
int fnic = 0; /* file name index count */
const char *proto;
static int opt = 0; /* FUSER_OPT_ */
dev_t dev;
ino_t inode;
pid_list *pids;
inode_list *inodes;
int killsig = SIGTERM;
int success = 1;
fni = xmalloc(sizeof(int));
for(i=1;i<argc;i++) {
optn = fuser_option(argv[i]);
if(optn) opt |= optn;
else if(argv[i][0] == '-') {
if(!(u_signal_names(argv[i]+1, &killsig, 0)))
killsig = SIGTERM;
}
else {
fni = xrealloc(fni, sizeof(int) * (fnic+2));
fni[fnic++] = i;
}
}
if(!fnic) return 1;
pids = xmalloc(sizeof(pid_list));
inodes = xmalloc(sizeof(inode_list));
for(i=0;i<fnic;i++) {
if(fuser_parse_net_arg(argv[fni[i]], &proto, &port)) {
fuser_scan_proc_net(opt, proto, port, inodes);
}
else {
if(!fuser_file_to_dev_inode(
argv[fni[i]], &dev, &inode)) {
free(pids);
free(inodes);
bb_perror_msg_and_die(
"Could not open '%s'", argv[fni[i]]);
}
fuser_add_inode(inodes, dev, inode);
}
}
success = fuser_scan_proc_pids(opt, inodes, pids);
/* if the first pid in the list is 0, none have been found */
if(pids->pid == 0) success = 0;
if(success) {
if(opt & FUSER_OPT_KILL) {
success = fuser_kill_pid_list(pids, killsig);
}
else if(!(opt & FUSER_OPT_SILENT)) {
success = fuser_print_pid_list(pids);
}
}
free(pids);
free(inodes);
/* return 0 on (success == 1) 1 otherwise */
return (success != 1);
}
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