New applet, fuser, from Tony J. White. (Needs some cleanup.)
This commit is contained in:
Rob Landley
parent
30c7de068b
commit
aa87276bed
@ -258,6 +258,9 @@
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#ifdef CONFIG_FTPPUT
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APPLET(ftpput, ftpgetput_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
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#endif
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#ifdef CONFIG_FUSER
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APPLET(fuser, fuser_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
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#endif
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#ifdef CONFIG_GETOPT
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APPLET(getopt, getopt_main, _BB_DIR_BIN, _BB_SUID_NEVER)
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#endif
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@ -841,6 +841,16 @@
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"\t-p, --password Password to be used\n" \
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"\t-P, --port Port number to be used"
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#define fuser_trivial_usage \
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"[options] file OR port/proto"
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#define fuser_full_usage \
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"Options:\n" \
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"\t-m Show all processes on the same mounted fs\n" \
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"\t-k Kill all processes that match.\n" \
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"\t-s Don't print or kill anything.\n" \
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"\t-4 When using port/proto only search IPv4 space\n" \
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"\t-6 When using port/proto only search IPv6 space\n" \
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"\t-SIGNAL When used with -k, this signal will be used to kill\n"
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#define getopt_trivial_usage \
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"[OPTIONS]..."
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#define getopt_full_usage \
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@ -13,6 +13,14 @@ config CONFIG_FREE
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memory in the system, as well as the buffers used by the kernel.
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The shared memory column should be ignored; it is obsolete.
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config CONFIG_FUSER
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bool "fuser"
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default n
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help
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fuser lists all PIDs (Process IDs) that currently have a given
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file open. fuser can also list all PIDs that have a given network
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(TCP or UDP) port open.
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config CONFIG_KILL
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bool "kill"
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default n
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@ -103,5 +111,6 @@ config CONFIG_UPTIME
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the system has been running, how many users are currently logged
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on, and the system load averages for the past 1, 5, and 15 minutes.
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endmenu
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@ -19,6 +19,7 @@ PROCPS-$(CONFIG_RENICE) += renice.o
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PROCPS-$(CONFIG_BB_SYSCTL) += sysctl.o
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PROCPS-$(CONFIG_TOP) += top.o
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PROCPS-$(CONFIG_UPTIME) += uptime.o
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PROCPS-$(CONFIG_FUSER) += fuser.o
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libraries-y+=$(PROCPS_DIR)$(PROCPS_AR)
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386
procps/fuser.c
Normal file
386
procps/fuser.c
Normal file
@ -0,0 +1,386 @@
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/*
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* tiny fuser implementation
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*
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* Copyright 2004 Tony J. White
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*
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* May be distributed under the conditions of the
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* GNU Library General Public License
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*/
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/* this define is needed for asprintf() */
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <limits.h>
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#include <dirent.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include "busybox.h"
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#define FUSER_PROC_DIR "/proc"
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#define FUSER_MAX_LINE 255
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#define FUSER_OPT_MOUNT 1
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#define FUSER_OPT_KILL 2
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#define FUSER_OPT_SILENT 4
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#define FUSER_OPT_IP6 8
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#define FUSER_OPT_IP4 16
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typedef struct inode_list {
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ino_t inode;
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dev_t dev;
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struct inode_list *next;
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} inode_list;
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typedef struct pid_list {
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pid_t pid;
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struct pid_list *next;
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} pid_list;
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static int fuser_option(char *option)
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{
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int opt = 0;
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if(!(strlen(option))) return 0;
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if(option[0] != '-') return 0;
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*++option;
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while(*option != '\0') {
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if(*option == 'm') opt |= FUSER_OPT_MOUNT;
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else if(*option == 'k') opt |= FUSER_OPT_KILL;
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else if(*option == 's') opt |= FUSER_OPT_SILENT;
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else if(*option == '6') opt |= FUSER_OPT_IP6;
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else if(*option == '4') opt |= FUSER_OPT_IP4;
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else {
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bb_error_msg_and_die(
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"Unsupported option '%c'", *option);
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}
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*++option;
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}
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return opt;
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}
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static int fuser_file_to_dev_inode(const char *filename,
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dev_t *dev, ino_t *inode)
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{
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struct stat f_stat;
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if((stat(filename, &f_stat)) < 0) return 0;
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memcpy(inode, &f_stat.st_ino, sizeof(ino_t));
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memcpy(dev, &f_stat.st_dev, sizeof(dev_t));
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return 1;
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}
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static int fuser_find_socket_dev(dev_t *dev) {
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int fd = socket(PF_INET, SOCK_DGRAM,0);
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struct stat buf;
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if (fd >= 0 && (fstat(fd, &buf)) == 0) {
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memcpy(dev, &buf.st_dev, sizeof(dev_t));
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close(fd);
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return 1;
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}
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return 0;
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}
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static int fuser_parse_net_arg(const char *filename,
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const char **proto, int *port)
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{
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int tport;
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char path[PATH_MAX+1], tproto[5];
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if((sscanf(filename, "%d/%4s", &tport, &tproto[0])) != 2) return 0;
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strncpy(path, FUSER_PROC_DIR, sizeof(FUSER_PROC_DIR));
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strncat(path, "/net/", 5);
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strncat(path, tproto, strlen(tproto));
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if((access(path, R_OK)) != 0) return 0;
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*proto = bb_xstrndup(tproto, strlen(tproto));
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memcpy(port, &tport, sizeof(int));
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return 1;
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}
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static int fuser_add_pid(pid_list *plist, pid_t pid)
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{
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pid_list *curr = NULL, *last = NULL;
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if(plist->pid == 0) plist->pid = pid;
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curr = plist;
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while(curr != NULL) {
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if(curr->pid == pid) return 1;
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last = curr;
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curr = curr->next;
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}
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curr = xmalloc(sizeof(pid_list));
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last->next = curr;
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curr->pid = pid;
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curr->next = NULL;
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return 1;
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}
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static int fuser_add_inode(inode_list *ilist, dev_t dev, ino_t inode)
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{
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inode_list *curr = NULL, *last = NULL;
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if(!ilist->inode && !ilist->dev) {
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ilist->dev = dev;
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ilist->inode = inode;
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}
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curr = ilist;
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while(curr != NULL) {
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if(curr->inode == inode && curr->dev == dev) return 1;
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last = curr;
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curr = curr->next;
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}
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curr = xmalloc(sizeof(inode_list));
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last->next = curr;
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curr->dev = dev;
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curr->inode = inode;
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curr->next = NULL;
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return 1;
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}
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static int fuser_scan_proc_net(int opts, const char *proto,
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int port, inode_list *ilist)
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{
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char path[PATH_MAX+1], line[FUSER_MAX_LINE+1];
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char addr[128];
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ino_t tmp_inode;
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dev_t tmp_dev;
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int tmp_port;
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FILE *f;
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if(!fuser_find_socket_dev(&tmp_dev)) tmp_dev = 0;
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strncpy(path, FUSER_PROC_DIR, sizeof(FUSER_PROC_DIR));
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strncat(path, "/net/", 5);
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strncat(path, proto, strlen(proto));
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if (!(f = fopen(path, "r"))) return 0;
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while(fgets(line, FUSER_MAX_LINE, f)) {
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if(sscanf(line,
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"%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x %*x:%*x "
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"%*x:%*x %*x %*d %*d %lu",
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&addr[0], &tmp_port, &tmp_inode) == 3) {
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if((strlen(addr) == 8) &&
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(opts & FUSER_OPT_IP6)) continue;
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else if((strlen(addr) > 8) &&
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(opts & FUSER_OPT_IP4)) continue;
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if(tmp_port == port) {
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fuser_add_inode(ilist, tmp_dev, tmp_inode);
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}
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}
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}
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fclose(f);
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return 1;
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}
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static int fuser_search_dev_inode(int opts, inode_list *ilist,
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dev_t dev, ino_t inode)
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{
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inode_list *curr;
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curr = ilist;
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while(curr) {
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if((opts & FUSER_OPT_MOUNT) && curr->dev == dev)
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return 1;
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if(curr->inode == inode && curr->dev == dev)
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return 1;
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curr = curr->next;
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}
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return 0;
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}
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static int fuser_scan_pid_maps(int opts, const char *fname, pid_t pid,
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inode_list *ilist, pid_list *plist)
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{
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FILE *file;
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char line[FUSER_MAX_LINE + 1];
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int major, minor;
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ino_t inode;
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dev_t dev;
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if (!(file = fopen(fname, "r"))) return 0;
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while (fgets(line, FUSER_MAX_LINE, file)) {
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if(sscanf(line, "%*s %*s %*s %x:%x %ld",
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&major, &minor, &inode) != 3) continue;
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if(major == 0 && minor == 0 && inode == 0) continue;
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dev = makedev(major, minor);
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if(fuser_search_dev_inode(opts, ilist, dev, inode)) {
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fuser_add_pid(plist, pid);
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}
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}
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fclose(file);
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return 1;
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}
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static int fuser_scan_link(int opts, const char *lname, pid_t pid,
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inode_list *ilist, pid_list *plist)
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{
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ino_t inode;
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dev_t dev;
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if(!fuser_file_to_dev_inode(lname, &dev, &inode)) return 0;
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if(fuser_search_dev_inode(opts, ilist, dev, inode))
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fuser_add_pid(plist, pid);
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return 1;
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}
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static int fuser_scan_dir_links(int opts, const char *dname, pid_t pid,
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inode_list *ilist, pid_list *plist)
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{
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DIR *d;
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struct dirent *de;
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char *lname;
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if((d = opendir(dname))) {
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while((de = readdir(d)) != NULL) {
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if(!(strcmp(de->d_name, "."))) continue;
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if(!(strcmp(de->d_name, ".."))) continue;
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if(asprintf(&lname, "%s/%s", dname, de->d_name) < 0) {
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free(lname);
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continue;
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}
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fuser_scan_link(opts, lname, pid, ilist, plist);
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free(lname);
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}
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closedir(d);
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}
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else return 0;
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return 1;
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}
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static int fuser_scan_proc_pids(int opts, inode_list *ilist, pid_list *plist)
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{
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DIR *d;
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struct dirent *de;
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pid_t pid;
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char *dname;
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if(!(d = opendir(FUSER_PROC_DIR))) return 0;
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while((de = readdir(d)) != NULL) {
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pid = (pid_t)atoi(de->d_name);
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if(!pid) continue;
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if(asprintf(&dname, "%s/%d/", FUSER_PROC_DIR, pid) < 0) {
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free(dname);
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continue;
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}
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if(chdir(dname) < 0) {
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free(dname);
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continue;
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}
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free(dname);
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fuser_scan_link(opts, "cwd", pid, ilist, plist);
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fuser_scan_link(opts, "exe", pid, ilist, plist);
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fuser_scan_link(opts, "root", pid, ilist, plist);
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fuser_scan_dir_links(opts, "fd", pid, ilist, plist);
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fuser_scan_dir_links(opts, "lib", pid, ilist, plist);
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fuser_scan_dir_links(opts, "mmap", pid, ilist, plist);
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fuser_scan_pid_maps(opts, "maps", pid, ilist, plist);
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}
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closedir(d);
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return 1;
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}
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static int fuser_print_pid_list(pid_list *plist) {
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pid_list *curr;
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curr = plist;
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if(plist == NULL) return 0;
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while(curr != NULL) {
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if(curr->pid > 0) printf("%d ", curr->pid);
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curr = curr->next;
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}
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printf("\n");
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return 1;
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}
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static int fuser_kill_pid_list(pid_list *plist, int sig) {
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pid_list *curr;
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curr = plist;
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pid_t mypid = getpid();
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int success = 1;
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if(plist == NULL) return 0;
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while(curr != NULL) {
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if(curr->pid > 0 && curr->pid != mypid) {
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if (kill(curr->pid, sig) != 0) {
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bb_perror_msg(
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"Could not kill pid '%d'", curr->pid);
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success = 0;
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}
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}
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curr = curr->next;
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}
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return success;
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}
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extern int fuser_main(int argc, char **argv) {
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int port, i, optn;
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int* fni; /* file name indexes of argv */
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int fnic = 0; /* file name index count */
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const char *proto;
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static int opt = 0; /* FUSER_OPT_ */
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dev_t dev;
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ino_t inode;
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pid_list *pids;
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inode_list *inodes;
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int killsig = SIGTERM;
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int success = 1;
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fni = xmalloc(sizeof(int));
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for(i=1;i<argc;i++) {
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optn = fuser_option(argv[i]);
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if(optn) opt |= optn;
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else if(argv[i][0] == '-') {
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if(!(u_signal_names(argv[i]+1, &killsig, 0)))
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killsig = SIGTERM;
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}
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else {
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fni = xrealloc(fni, sizeof(int) * (fnic+2));
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fni[fnic++] = i;
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}
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}
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if(!fnic) return 1;
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pids = xmalloc(sizeof(pid_list));
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inodes = xmalloc(sizeof(inode_list));
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for(i=0;i<fnic;i++) {
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if(fuser_parse_net_arg(argv[fni[i]], &proto, &port)) {
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fuser_scan_proc_net(opt, proto, port, inodes);
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}
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else {
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if(!fuser_file_to_dev_inode(
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argv[fni[i]], &dev, &inode)) {
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free(pids);
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free(inodes);
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bb_perror_msg_and_die(
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"Could not open '%s'", argv[fni[i]]);
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}
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fuser_add_inode(inodes, dev, inode);
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}
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}
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success = fuser_scan_proc_pids(opt, inodes, pids);
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/* if the first pid in the list is 0, none have been found */
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if(pids->pid == 0) success = 0;
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if(success) {
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if(opt & FUSER_OPT_KILL) {
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success = fuser_kill_pid_list(pids, killsig);
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}
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else if(!(opt & FUSER_OPT_SILENT)) {
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success = fuser_print_pid_list(pids);
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}
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}
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free(pids);
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free(inodes);
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/* return 0 on (success == 1) 1 otherwise */
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return (success != 1);
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}
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