[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * tiny fuser implementation
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| 4 | *
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| 5 | * Copyright 2004 Tony J. White
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| 6 | *
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| 7 | * May be distributed under the conditions of the
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| 8 | * GNU Library General Public License
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| 9 | */
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| 10 |
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| 11 | #include "busybox.h"
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| 12 | #include <stdio.h>
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| 13 | #include <stdlib.h>
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| 14 | #include <unistd.h>
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| 15 | #include <string.h>
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| 16 | #include <limits.h>
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| 17 | #include <dirent.h>
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| 18 | #include <signal.h>
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| 19 | #include <sys/types.h>
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| 20 | #include <sys/ioctl.h>
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| 21 | #include <sys/stat.h>
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| 22 | #include <sys/socket.h>
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| 23 | #include <sys/sysmacros.h>
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| 24 |
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| 25 | #define FUSER_PROC_DIR "/proc"
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| 26 | #define FUSER_MAX_LINE 255
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| 27 |
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| 28 | #define FUSER_OPT_MOUNT 1
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| 29 | #define FUSER_OPT_KILL 2
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| 30 | #define FUSER_OPT_SILENT 4
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| 31 | #define FUSER_OPT_IP6 8
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| 32 | #define FUSER_OPT_IP4 16
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| 33 |
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| 34 | typedef struct inode_list {
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| 35 | ino_t inode;
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| 36 | dev_t dev;
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| 37 | struct inode_list *next;
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| 38 | } inode_list;
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| 39 |
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| 40 | typedef struct pid_list {
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| 41 | pid_t pid;
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| 42 | struct pid_list *next;
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| 43 | } pid_list;
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| 44 |
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| 45 | static int fuser_option(char *option)
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| 46 | {
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| 47 | int opt = 0;
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| 48 |
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| 49 | if(!(strlen(option))) return 0;
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| 50 | if(option[0] != '-') return 0;
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| 51 | ++option;
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| 52 | while(*option != '\0') {
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| 53 | if(*option == 'm') opt |= FUSER_OPT_MOUNT;
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| 54 | else if(*option == 'k') opt |= FUSER_OPT_KILL;
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| 55 | else if(*option == 's') opt |= FUSER_OPT_SILENT;
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| 56 | else if(*option == '6') opt |= FUSER_OPT_IP6;
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| 57 | else if(*option == '4') opt |= FUSER_OPT_IP4;
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| 58 | else {
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| 59 | bb_error_msg_and_die(
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| 60 | "Unsupported option '%c'", *option);
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| 61 | }
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| 62 | ++option;
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| 63 | }
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| 64 | return opt;
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| 65 | }
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| 66 |
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| 67 | static int fuser_file_to_dev_inode(const char *filename,
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| 68 | dev_t *dev, ino_t *inode)
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| 69 | {
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| 70 | struct stat f_stat;
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| 71 | if((stat(filename, &f_stat)) < 0) return 0;
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| 72 | *inode = f_stat.st_ino;
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| 73 | *dev = f_stat.st_dev;
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| 74 | return 1;
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| 75 | }
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| 76 |
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| 77 | static int fuser_find_socket_dev(dev_t *dev)
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| 78 | {
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| 79 | int fd = socket(PF_INET, SOCK_DGRAM,0);
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| 80 | struct stat buf;
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| 81 |
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| 82 | if (fd >= 0 && (fstat(fd, &buf)) == 0) {
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| 83 | *dev = buf.st_dev;
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| 84 | close(fd);
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| 85 | return 1;
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| 86 | }
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| 87 | return 0;
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| 88 | }
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| 89 |
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| 90 | static int fuser_parse_net_arg(const char *filename,
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| 91 | const char **proto, int *port)
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| 92 | {
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| 93 | char path[sizeof(FUSER_PROC_DIR)+12], tproto[5];
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| 94 |
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| 95 | if((sscanf(filename, "%d/%4s", port, tproto)) != 2) return 0;
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| 96 | sprintf(path, "%s/net/%s", FUSER_PROC_DIR, tproto);
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| 97 | if((access(path, R_OK)) != 0) return 0;
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| 98 | *proto = bb_xstrdup(tproto);
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| 99 | return 1;
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| 100 | }
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| 101 |
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| 102 | static int fuser_add_pid(pid_list *plist, pid_t pid)
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| 103 | {
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| 104 | pid_list *curr = NULL, *last = NULL;
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| 105 |
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| 106 | if(plist->pid == 0) plist->pid = pid;
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| 107 | curr = plist;
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| 108 | while(curr != NULL) {
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| 109 | if(curr->pid == pid) return 1;
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| 110 | last = curr;
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| 111 | curr = curr->next;
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| 112 | }
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| 113 | curr = xmalloc(sizeof(pid_list));
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| 114 | last->next = curr;
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| 115 | curr->pid = pid;
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| 116 | curr->next = NULL;
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| 117 | return 1;
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| 118 | }
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| 119 |
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| 120 | static int fuser_add_inode(inode_list *ilist, dev_t dev, ino_t inode)
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| 121 | {
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| 122 | inode_list *curr = NULL, *last = NULL;
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| 123 |
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| 124 | if(!ilist->inode && !ilist->dev) {
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| 125 | ilist->dev = dev;
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| 126 | ilist->inode = inode;
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| 127 | }
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| 128 | curr = ilist;
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| 129 | while(curr != NULL) {
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| 130 | if(curr->inode == inode && curr->dev == dev) return 1;
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| 131 | last = curr;
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| 132 | curr = curr->next;
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| 133 | }
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| 134 | curr = xmalloc(sizeof(inode_list));
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| 135 | last->next = curr;
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| 136 | curr->dev = dev;
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| 137 | curr->inode = inode;
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| 138 | curr->next = NULL;
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| 139 | return 1;
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| 140 | }
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| 141 |
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| 142 | static int fuser_scan_proc_net(int opts, const char *proto,
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| 143 | int port, inode_list *ilist)
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| 144 | {
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| 145 | char path[sizeof(FUSER_PROC_DIR)+12], line[FUSER_MAX_LINE+1];
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| 146 | char addr[128];
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| 147 | ino_t tmp_inode;
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| 148 | dev_t tmp_dev;
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| 149 | long long uint64_inode;
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| 150 | int tmp_port;
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| 151 | FILE *f;
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| 152 |
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| 153 | if(!fuser_find_socket_dev(&tmp_dev)) tmp_dev = 0;
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| 154 | sprintf(path, "%s/net/%s", FUSER_PROC_DIR, proto);
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| 155 |
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| 156 | if (!(f = fopen(path, "r"))) return 0;
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| 157 | while(fgets(line, FUSER_MAX_LINE, f)) {
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| 158 | if(sscanf(line,
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| 159 | "%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x %*x:%*x "
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| 160 | "%*x:%*x %*x %*d %*d %llu",
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| 161 | addr, &tmp_port, &uint64_inode) == 3) {
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| 162 | if((strlen(addr) == 8) &&
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| 163 | (opts & FUSER_OPT_IP6)) continue;
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| 164 | else if((strlen(addr) > 8) &&
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| 165 | (opts & FUSER_OPT_IP4)) continue;
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| 166 | if(tmp_port == port) {
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| 167 | tmp_inode = uint64_inode;
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| 168 | fuser_add_inode(ilist, tmp_dev, tmp_inode);
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| 169 | }
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| 170 | }
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| 171 |
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| 172 | }
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| 173 | fclose(f);
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| 174 | return 1;
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| 175 | }
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| 176 |
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| 177 | static int fuser_search_dev_inode(int opts, inode_list *ilist,
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| 178 | dev_t dev, ino_t inode)
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| 179 | {
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| 180 | inode_list *curr;
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| 181 | curr = ilist;
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| 182 |
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| 183 | while(curr) {
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| 184 | if((opts & FUSER_OPT_MOUNT) && curr->dev == dev)
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| 185 | return 1;
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| 186 | if(curr->inode == inode && curr->dev == dev)
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| 187 | return 1;
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| 188 | curr = curr->next;
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| 189 | }
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| 190 | return 0;
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| 191 | }
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| 192 |
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| 193 | static int fuser_scan_pid_maps(int opts, const char *fname, pid_t pid,
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| 194 | inode_list *ilist, pid_list *plist)
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| 195 | {
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| 196 | FILE *file;
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| 197 | char line[FUSER_MAX_LINE + 1];
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| 198 | int major, minor;
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| 199 | ino_t inode;
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| 200 | long long uint64_inode;
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| 201 | dev_t dev;
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| 202 |
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| 203 | if (!(file = fopen(fname, "r"))) return 0;
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| 204 | while (fgets(line, FUSER_MAX_LINE, file)) {
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| 205 | if(sscanf(line, "%*s %*s %*s %x:%x %llu",
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| 206 | &major, &minor, &uint64_inode) != 3) continue;
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| 207 | inode = uint64_inode;
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| 208 | if(major == 0 && minor == 0 && inode == 0) continue;
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| 209 | dev = makedev(major, minor);
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| 210 | if(fuser_search_dev_inode(opts, ilist, dev, inode)) {
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| 211 | fuser_add_pid(plist, pid);
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| 212 | }
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| 213 |
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| 214 | }
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| 215 | fclose(file);
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| 216 | return 1;
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| 217 | }
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| 218 |
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| 219 | static int fuser_scan_link(int opts, const char *lname, pid_t pid,
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| 220 | inode_list *ilist, pid_list *plist)
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| 221 | {
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| 222 | ino_t inode;
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| 223 | dev_t dev;
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| 224 |
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| 225 | if(!fuser_file_to_dev_inode(lname, &dev, &inode)) return 0;
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| 226 | if(fuser_search_dev_inode(opts, ilist, dev, inode))
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| 227 | fuser_add_pid(plist, pid);
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| 228 | return 1;
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| 229 | }
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| 230 |
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| 231 | static int fuser_scan_dir_links(int opts, const char *dname, pid_t pid,
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| 232 | inode_list *ilist, pid_list *plist)
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| 233 | {
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| 234 | DIR *d;
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| 235 | struct dirent *de;
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| 236 | char *lname;
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| 237 |
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| 238 | if((d = opendir(dname))) {
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| 239 | while((de = readdir(d)) != NULL) {
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| 240 | lname = concat_subpath_file(dname, de->d_name);
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| 241 | if(lname == NULL)
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| 242 | continue;
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| 243 | fuser_scan_link(opts, lname, pid, ilist, plist);
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| 244 | free(lname);
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| 245 | }
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| 246 | closedir(d);
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| 247 | }
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| 248 | else return 0;
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| 249 | return 1;
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| 250 |
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| 251 | }
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| 252 |
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| 253 | static int fuser_scan_proc_pids(int opts, inode_list *ilist, pid_list *plist)
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| 254 | {
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| 255 | DIR *d;
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| 256 | struct dirent *de;
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| 257 | pid_t pid;
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| 258 | char *dname;
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| 259 |
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| 260 | if(!(d = opendir(FUSER_PROC_DIR))) return 0;
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| 261 | while((de = readdir(d)) != NULL) {
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| 262 | pid = (pid_t)atoi(de->d_name);
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| 263 | if(!pid) continue;
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| 264 | dname = concat_subpath_file(FUSER_PROC_DIR, de->d_name);
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| 265 | if(chdir(dname) < 0) {
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| 266 | free(dname);
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| 267 | continue;
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| 268 | }
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| 269 | free(dname);
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| 270 | fuser_scan_link(opts, "cwd", pid, ilist, plist);
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| 271 | fuser_scan_link(opts, "exe", pid, ilist, plist);
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| 272 | fuser_scan_link(opts, "root", pid, ilist, plist);
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| 273 | fuser_scan_dir_links(opts, "fd", pid, ilist, plist);
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| 274 | fuser_scan_dir_links(opts, "lib", pid, ilist, plist);
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| 275 | fuser_scan_dir_links(opts, "mmap", pid, ilist, plist);
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| 276 | fuser_scan_pid_maps(opts, "maps", pid, ilist, plist);
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| 277 | chdir("..");
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| 278 | }
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| 279 | closedir(d);
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| 280 | return 1;
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| 281 | }
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| 282 |
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| 283 | static int fuser_print_pid_list(pid_list *plist)
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| 284 | {
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| 285 | pid_list *curr = plist;
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| 286 |
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| 287 | if(plist == NULL) return 0;
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| 288 | while(curr != NULL) {
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| 289 | if(curr->pid > 0) printf("%d ", curr->pid);
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| 290 | curr = curr->next;
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| 291 | }
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| 292 | printf("\n");
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| 293 | return 1;
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| 294 | }
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| 295 |
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| 296 | static int fuser_kill_pid_list(pid_list *plist, int sig)
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| 297 | {
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| 298 | pid_list *curr = plist;
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| 299 | pid_t mypid = getpid();
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| 300 | int success = 1;
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| 301 |
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| 302 | if(plist == NULL) return 0;
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| 303 | while(curr != NULL) {
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| 304 | if(curr->pid > 0 && curr->pid != mypid) {
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| 305 | if (kill(curr->pid, sig) != 0) {
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| 306 | bb_perror_msg(
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| 307 | "Could not kill pid '%d'", curr->pid);
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| 308 | success = 0;
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| 309 | }
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| 310 | }
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| 311 | curr = curr->next;
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| 312 | }
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| 313 | return success;
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| 314 | }
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| 315 |
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| 316 | int fuser_main(int argc, char **argv)
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| 317 | {
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| 318 | int port, i, optn;
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| 319 | int* fni; /* file name indexes of argv */
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| 320 | int fnic = 0; /* file name index count */
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| 321 | const char *proto;
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| 322 | static int opt = 0; /* FUSER_OPT_ */
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| 323 | dev_t dev;
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| 324 | ino_t inode;
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| 325 | pid_list *pids;
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| 326 | inode_list *inodes;
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| 327 | int killsig = SIGTERM;
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| 328 | int success = 1;
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| 329 |
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| 330 | if (argc < 2)
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| 331 | bb_show_usage();
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| 332 |
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| 333 | fni = xmalloc(sizeof(int));
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| 334 | for(i=1;i<argc;i++) {
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| 335 | optn = fuser_option(argv[i]);
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| 336 | if(optn) opt |= optn;
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| 337 | else if(argv[i][0] == '-') {
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| 338 | if(!(u_signal_names(argv[i]+1, &killsig, 0)))
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| 339 | killsig = SIGTERM;
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| 340 | }
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| 341 | else {
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| 342 | fni = xrealloc(fni, sizeof(int) * (fnic+2));
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| 343 | fni[fnic++] = i;
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| 344 | }
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| 345 | }
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| 346 | if(!fnic) return 1;
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| 347 |
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| 348 | pids = xmalloc(sizeof(pid_list));
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| 349 | inodes = xmalloc(sizeof(inode_list));
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| 350 | for(i=0;i<fnic;i++) {
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| 351 | if(fuser_parse_net_arg(argv[fni[i]], &proto, &port)) {
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| 352 | fuser_scan_proc_net(opt, proto, port, inodes);
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| 353 | }
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| 354 | else {
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| 355 | if(!fuser_file_to_dev_inode(
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| 356 | argv[fni[i]], &dev, &inode)) {
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| 357 | free(pids);
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| 358 | free(inodes);
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| 359 | bb_perror_msg_and_die(
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| 360 | "Could not open '%s'", argv[fni[i]]);
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| 361 | }
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| 362 | fuser_add_inode(inodes, dev, inode);
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| 363 | }
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| 364 | }
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| 365 | success = fuser_scan_proc_pids(opt, inodes, pids);
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| 366 | /* if the first pid in the list is 0, none have been found */
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| 367 | if(pids->pid == 0) success = 0;
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| 368 | if(success) {
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| 369 | if(opt & FUSER_OPT_KILL) {
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| 370 | success = fuser_kill_pid_list(pids, killsig);
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| 371 | }
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| 372 | else if(!(opt & FUSER_OPT_SILENT)) {
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| 373 | success = fuser_print_pid_list(pids);
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| 374 | }
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| 375 | }
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| 376 | free(pids);
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| 377 | free(inodes);
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| 378 | /* return 0 on (success == 1) 1 otherwise */
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| 379 | return (success != 1);
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| 380 | }
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