mirror of
https://github.com/sheumann/hush.git
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*: s/can't open %s/can't open '%s'/, it's better to use same string. function old new delta do_modprobe 588 601 +13 config_file_action 339 345 +6 modprobe_main 565 570 +5 unable_to_open 14 16 +2 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 4/0 up/down: 26/0) Total: 26 bytes text data bss dec hex filename 816800 476 7892 825168 c9750 busybox_old 816812 476 7892 825180 c975c busybox_unstripped
346 lines
7.1 KiB
C
346 lines
7.1 KiB
C
/* vi: set sw=4 ts=4: */
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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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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#define MAX_LINE 255
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#define OPTION_STRING "mks64"
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enum {
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OPT_MOUNT = (1 << 0),
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OPT_KILL = (1 << 1),
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OPT_SILENT = (1 << 2),
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OPT_IP6 = (1 << 3),
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OPT_IP4 = (1 << 4),
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};
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typedef struct inode_list {
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struct inode_list *next;
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ino_t inode;
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dev_t dev;
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} inode_list;
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typedef struct pid_list {
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struct pid_list *next;
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pid_t pid;
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} pid_list;
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static dev_t find_socket_dev(void)
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{
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int fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd >= 0) {
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struct stat buf;
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int r = fstat(fd, &buf);
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close(fd);
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if (r == 0)
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return buf.st_dev;
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}
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return 0;
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}
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static int file_to_dev_inode(const char *filename, 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))
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return 0;
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*inode = f_stat.st_ino;
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*dev = f_stat.st_dev;
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return 1;
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}
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static char *parse_net_arg(const char *arg, unsigned *port)
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{
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char path[20], tproto[5];
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if (sscanf(arg, "%u/%4s", port, tproto) != 2)
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return NULL;
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sprintf(path, "/proc/net/%s", tproto);
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if (access(path, R_OK) != 0)
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return NULL;
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return xstrdup(tproto);
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}
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static pid_list *add_pid(pid_list *plist, pid_t pid)
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{
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pid_list *curr = plist;
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while (curr != NULL) {
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if (curr->pid == pid)
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return plist;
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curr = curr->next;
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}
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curr = xmalloc(sizeof(pid_list));
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curr->pid = pid;
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curr->next = plist;
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return curr;
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}
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static inode_list *add_inode(inode_list *ilist, dev_t dev, ino_t inode)
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{
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inode_list *curr = ilist;
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while (curr != NULL) {
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if (curr->inode == inode && curr->dev == dev)
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return ilist;
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curr = curr->next;
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}
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curr = xmalloc(sizeof(inode_list));
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curr->dev = dev;
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curr->inode = inode;
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curr->next = ilist;
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return curr;
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}
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static inode_list *scan_proc_net(const char *proto,
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unsigned port, inode_list *ilist)
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{
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char path[20], line[MAX_LINE + 1];
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ino_t tmp_inode;
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dev_t tmp_dev;
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long long uint64_inode;
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unsigned tmp_port;
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FILE *f;
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tmp_dev = find_socket_dev();
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sprintf(path, "/proc/net/%s", proto);
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f = fopen_for_read(path);
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if (!f)
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return ilist;
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while (fgets(line, MAX_LINE, f)) {
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char addr[68];
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if (sscanf(line, "%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x %*x:%*x "
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"%*x:%*x %*x %*d %*d %llu",
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addr, &tmp_port, &uint64_inode) == 3
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) {
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int len = strlen(addr);
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if (len == 8 && (option_mask32 & OPT_IP6))
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continue;
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if (len > 8 && (option_mask32 & OPT_IP4))
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continue;
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if (tmp_port == port) {
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tmp_inode = uint64_inode;
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ilist = 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 ilist;
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}
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static int search_dev_inode(inode_list *ilist, dev_t dev, ino_t inode)
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{
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while (ilist) {
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if (ilist->dev == dev) {
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if (option_mask32 & OPT_MOUNT)
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return 1;
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if (ilist->inode == inode)
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return 1;
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}
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ilist = ilist->next;
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}
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return 0;
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}
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static pid_list *scan_pid_maps(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[MAX_LINE + 1];
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int major, minor;
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ino_t inode;
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long long uint64_inode;
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dev_t dev;
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file = fopen_for_read(fname);
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if (!file)
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return plist;
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while (fgets(line, MAX_LINE, file)) {
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if (sscanf(line, "%*s %*s %*s %x:%x %llu", &major, &minor, &uint64_inode) != 3)
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continue;
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inode = uint64_inode;
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if (major == 0 && minor == 0 && inode == 0)
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continue;
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dev = makedev(major, minor);
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if (search_dev_inode(ilist, dev, inode))
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plist = add_pid(plist, pid);
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}
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fclose(file);
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return plist;
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}
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static pid_list *scan_link(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 (!file_to_dev_inode(lname, &dev, &inode))
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return plist;
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if (search_dev_inode(ilist, dev, inode))
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plist = add_pid(plist, pid);
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return plist;
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}
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static pid_list *scan_dir_links(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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d = opendir(dname);
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if (!d)
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return plist;
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while ((de = readdir(d)) != NULL) {
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lname = concat_subpath_file(dname, de->d_name);
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if (lname == NULL)
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continue;
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plist = scan_link(lname, pid, ilist, plist);
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free(lname);
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}
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closedir(d);
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return plist;
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}
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/* NB: does chdir internally */
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static pid_list *scan_proc_pids(inode_list *ilist)
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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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pid_list *plist;
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xchdir("/proc");
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d = opendir("/proc");
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if (!d)
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return NULL;
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plist = NULL;
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while ((de = readdir(d)) != NULL) {
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pid = (pid_t)bb_strtou(de->d_name, NULL, 10);
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if (errno)
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continue;
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if (chdir(de->d_name) < 0)
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continue;
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plist = scan_link("cwd", pid, ilist, plist);
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plist = scan_link("exe", pid, ilist, plist);
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plist = scan_link("root", pid, ilist, plist);
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plist = scan_dir_links("fd", pid, ilist, plist);
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plist = scan_dir_links("lib", pid, ilist, plist);
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plist = scan_dir_links("mmap", pid, ilist, plist);
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plist = scan_pid_maps("maps", pid, ilist, plist);
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xchdir("/proc");
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}
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closedir(d);
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return plist;
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}
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static int print_pid_list(pid_list *plist)
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{
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while (plist != NULL) {
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printf("%u ", (unsigned)plist->pid);
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plist = plist->next;
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}
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bb_putchar('\n');
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return 1;
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}
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static int kill_pid_list(pid_list *plist, int sig)
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{
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pid_t mypid = getpid();
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int success = 1;
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while (plist != NULL) {
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if (plist->pid != mypid) {
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if (kill(plist->pid, sig) != 0) {
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bb_perror_msg("kill pid %u", (unsigned)plist->pid);
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success = 0;
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}
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}
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plist = plist->next;
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}
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return success;
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}
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int fuser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int fuser_main(int argc UNUSED_PARAM, char **argv)
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{
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pid_list *plist;
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inode_list *ilist;
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char **pp;
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dev_t dev;
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ino_t inode;
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unsigned port;
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int opt;
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int success;
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int killsig;
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/*
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fuser [options] FILEs or PORT/PROTOs
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Find processes which use FILEs or PORTs
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-m Find processes which use same fs as FILEs
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-4 Search only IPv4 space
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-6 Search only IPv6 space
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-s Silent: just exit with 0 if any processes are found
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-k Kill found processes (otherwise display PIDs)
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-SIGNAL Signal to send (default: TERM)
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*/
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/* Handle -SIGNAL. Oh my... */
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killsig = SIGTERM;
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pp = argv;
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while (*++pp) {
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char *arg = *pp;
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if (arg[0] != '-')
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continue;
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if (arg[1] == '-' && arg[2] == '\0') /* "--" */
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break;
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if ((arg[1] == '4' || arg[1] == '6') && arg[2] == '\0')
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continue; /* it's "-4" or "-6" */
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opt = get_signum(&arg[1]);
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if (opt < 0)
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continue;
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/* "-SIGNAL" option found. Remove it and bail out */
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killsig = opt;
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do {
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pp[0] = arg = pp[1];
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pp++;
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} while (arg);
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break;
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}
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opt = getopt32(argv, OPTION_STRING);
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argv += optind;
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ilist = NULL;
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pp = argv;
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while (*pp) {
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char *proto = parse_net_arg(*pp, &port);
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if (proto) { /* PORT/PROTO */
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ilist = scan_proc_net(proto, port, ilist);
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free(proto);
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} else { /* FILE */
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if (!file_to_dev_inode(*pp, &dev, &inode))
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bb_perror_msg_and_die("can't open '%s'", *pp);
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ilist = add_inode(ilist, dev, inode);
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}
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pp++;
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}
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plist = scan_proc_pids(ilist); /* changes dir to "/proc" */
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if (!plist)
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return EXIT_FAILURE;
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success = 1;
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if (opt & OPT_KILL) {
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success = kill_pid_list(plist, killsig);
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} else if (!(opt & OPT_SILENT)) {
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success = print_pid_list(plist);
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}
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return (success != 1); /* 0 == success */
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}
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