+/* vi: set sw=4 ts=4: */
/*
- * tiny fuser implementation
- *
+ * tiny fuser implementation
+ *
* Copyright 2004 Tony J. White
*
- * May be distributed under the conditions of the
- * GNU Library General Public License
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
-#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
+//usage:#define fuser_trivial_usage
+//usage: "[OPTIONS] FILE or PORT/PROTO"
+//usage:#define fuser_full_usage "\n\n"
+//usage: "Find processes which use FILEs or PORTs\n"
+//usage: "\n -m Find processes which use same fs as FILEs"
+//usage: "\n -4,-6 Search only IPv4/IPv6 space"
+//usage: "\n -s Don't display PIDs"
+//usage: "\n -k Kill found processes"
+//usage: "\n -SIGNAL Signal to send (default: KILL)"
+
+#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;
- 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)
+struct globals {
+ int recursion_depth;
+ pid_t mypid;
+ inode_list *inode_list_head;
+ smallint kill_failed;
+ int killsig;
+} FIX_ALIASING;
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define INIT_G() do { \
+ G.mypid = getpid(); \
+ G.killsig = SIGKILL; \
+} while (0)
+
+static void add_inode(const struct stat *st)
{
- 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);
+ inode_list **curr = &G.inode_list_head;
+
+ while (*curr) {
+ if ((*curr)->dev == st->st_dev
+ && (*curr)->inode == st->st_ino
+ ) {
+ return;
}
- ++option;
+ curr = &(*curr)->next;
}
- 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;
+ *curr = xzalloc(sizeof(inode_list));
+ (*curr)->dev = st->st_dev;
+ (*curr)->inode = st->st_ino;
}
-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;
+static smallint 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;
}
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;
-}
+enum {
+ PROC_NET = 0,
+ PROC_DIR,
+ PROC_DIR_LINKS,
+ PROC_SUBDIR_LINKS,
+};
-static int fuser_add_pid(pid_list *plist, pid_t pid)
+static smallint scan_proc_net_or_maps(const char *path, unsigned port)
{
- 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;
-}
+ FILE *f;
+ char line[MAX_LINE + 1], addr[68];
+ int major, minor, r;
+ long long uint64_inode;
+ unsigned tmp_port;
+ smallint retval;
+ struct stat statbuf;
+ const char *fmt;
+ void *fag, *sag;
+
+ f = fopen_for_read(path);
+ if (!f)
+ return 0;
+
+ if (G.recursion_depth == PROC_NET) {
+ int fd;
+
+ /* find socket dev */
+ statbuf.st_dev = 0;
+ fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (fd >= 0) {
+ fstat(fd, &statbuf);
+ close(fd);
+ }
-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;
+ fmt = "%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x "
+ "%*x:%*x %*x:%*x %*x %*d %*d %llu";
+ fag = addr;
+ sag = &tmp_port;
+ } else {
+ fmt = "%*s %*s %*s %x:%x %llu";
+ fag = &major;
+ sag = &minor;
}
- 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;
+ retval = 0;
+ while (fgets(line, MAX_LINE, f)) {
+ r = sscanf(line, fmt, fag, sag, &uint64_inode);
+ if (r != 3)
+ continue;
- 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);
+ statbuf.st_ino = uint64_inode;
+ if (G.recursion_depth == PROC_NET) {
+ r = strlen(addr);
+ if (r == 8 && (option_mask32 & OPT_IP6))
+ continue;
+ if (r > 8 && (option_mask32 & OPT_IP4))
+ continue;
+ if (tmp_port == port)
+ add_inode(&statbuf);
+ } else {
+ if (major != 0 && minor != 0 && statbuf.st_ino != 0) {
+ statbuf.st_dev = makedev(major, minor);
+ retval = search_dev_inode(&statbuf);
+ if (retval)
+ break;
}
}
-
}
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;
+ return retval;
}
-static int fuser_scan_pid_maps(int opts, const char *fname, pid_t pid,
- inode_list *ilist, pid_list *plist)
+static smallint scan_recursive(const char *path)
{
- 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);
+ DIR *d;
+ struct dirent *d_ent;
+ smallint stop_scan;
+ smallint retval;
+
+ d = opendir(path);
+ if (d == NULL)
+ return 0;
+
+ G.recursion_depth++;
+ retval = 0;
+ stop_scan = 0;
+ while (!stop_scan && (d_ent = readdir(d)) != NULL) {
+ struct stat statbuf;
+ pid_t pid;
+ char *subpath;
+
+ subpath = concat_subpath_file(path, d_ent->d_name);
+ if (subpath == NULL)
+ continue; /* . or .. */
+
+ switch (G.recursion_depth) {
+ case PROC_DIR:
+ pid = (pid_t)bb_strtou(d_ent->d_name, NULL, 10);
+ if (errno != 0
+ || pid == G.mypid
+ /* "this PID doesn't use specified FILEs or PORT/PROTO": */
+ || scan_recursive(subpath) == 0
+ ) {
+ break;
+ }
+ if (option_mask32 & OPT_KILL) {
+ if (kill(pid, G.killsig) != 0) {
+ bb_perror_msg("kill pid %s", d_ent->d_name);
+ G.kill_failed = 1;
+ }
+ }
+ if (!(option_mask32 & OPT_SILENT))
+ printf("%s ", d_ent->d_name);
+ retval = 1;
+ break;
+
+ case PROC_DIR_LINKS:
+ switch (
+ index_in_substrings(
+ "cwd" "\0" "exe" "\0"
+ "root" "\0" "fd" "\0"
+ "lib" "\0" "mmap" "\0"
+ "maps" "\0",
+ d_ent->d_name
+ )
+ ) {
+ enum {
+ CWD_LINK,
+ EXE_LINK,
+ ROOT_LINK,
+ FD_DIR_LINKS,
+ LIB_DIR_LINKS,
+ MMAP_DIR_LINKS,
+ MAPS,
+ };
+ case CWD_LINK:
+ case EXE_LINK:
+ case ROOT_LINK:
+ goto scan_link;
+ case FD_DIR_LINKS:
+ case LIB_DIR_LINKS:
+ case MMAP_DIR_LINKS:
+ stop_scan = scan_recursive(subpath);
+ if (stop_scan)
+ retval = stop_scan;
+ break;
+ case MAPS:
+ stop_scan = scan_proc_net_or_maps(subpath, 0);
+ if (stop_scan)
+ retval = stop_scan;
+ default:
+ break;
+ }
+ break;
+ case PROC_SUBDIR_LINKS:
+ scan_link:
+ if (stat(subpath, &statbuf) < 0)
+ break;
+ stop_scan = search_dev_inode(&statbuf);
+ if (stop_scan)
+ retval = stop_scan;
+ default:
+ break;
}
-
+ free(subpath);
}
- fclose(file);
- return 1;
+ closedir(d);
+ G.recursion_depth--;
+ return retval;
}
-static int fuser_scan_link(int opts, const char *lname, pid_t pid,
- inode_list *ilist, pid_list *plist)
+int fuser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int fuser_main(int argc UNUSED_PARAM, char **argv)
{
- 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);
+ char **pp;
+
+ INIT_G();
+
+ /* Handle -SIGNAL. Oh my... */
+ pp = argv;
+ while (*++pp) {
+ int sig;
+ 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" */
+ sig = get_signum(&arg[1]);
+ if (sig < 0)
+ continue;
+ /* "-SIGNAL" option found. Remove it and bail out */
+ G.killsig = sig;
+ do {
+ pp[0] = arg = pp[1];
+ pp++;
+ } while (arg);
+ break;
}
- 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;
+ opt_complementary = "-1"; /* at least one param */
+ getopt32(argv, OPTION_STRING);
+ argv += optind;
+
+ pp = argv;
+ while (*pp) {
+ /* parse net arg */
+ unsigned port;
+ char path[sizeof("/proc/net/TCP6")];
+
+ strcpy(path, "/proc/net/");
+ if (sscanf(*pp, "%u/%4s", &port, path + sizeof("/proc/net/")-1) == 2
+ && access(path, R_OK) == 0
+ ) {
+ /* PORT/PROTO */
+ scan_proc_net_or_maps(path, port);
+ } else {
+ /* FILE */
+ struct stat statbuf;
+ xstat(*pp, &statbuf);
+ add_inode(&statbuf);
}
- 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 = plist;
-
- if(plist == NULL) return 0;
- while(curr != NULL) {
- if(curr->pid > 0) printf("%d ", curr->pid);
- curr = curr->next;
+ pp++;
}
- printf("\n");
- return 1;
-}
-static int fuser_kill_pid_list(pid_list *plist, int sig) {
- pid_list *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 (scan_recursive("/proc")) {
+ if (!(option_mask32 & OPT_SILENT))
+ bb_putchar('\n');
+ return G.kill_failed;
}
- 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);
-}
+ return EXIT_FAILURE;
+}
projects / platform / upstream / busybox.git / blobdiff