[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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[1770] | 11 | #include "libbb.h"
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[821] | 12 |
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| 13 | #define FUSER_PROC_DIR "/proc"
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| 14 | #define FUSER_MAX_LINE 255
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| 15 |
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| 16 | #define FUSER_OPT_MOUNT 1
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| 17 | #define FUSER_OPT_KILL 2
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| 18 | #define FUSER_OPT_SILENT 4
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| 19 | #define FUSER_OPT_IP6 8
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| 20 | #define FUSER_OPT_IP4 16
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| 21 |
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| 22 | typedef struct inode_list {
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| 23 | ino_t inode;
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| 24 | dev_t dev;
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| 25 | struct inode_list *next;
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| 26 | } inode_list;
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| 27 |
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| 28 | typedef struct pid_list {
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| 29 | pid_t pid;
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| 30 | struct pid_list *next;
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| 31 | } pid_list;
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| 32 |
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| 33 | static int fuser_option(char *option)
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| 34 | {
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| 35 | int opt = 0;
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| 36 |
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[1770] | 37 | if (!option[0])
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| 38 | return 0;
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| 39 | if (option[0] != '-')
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| 40 | return 0;
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[821] | 41 | ++option;
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[1770] | 42 | while (*option != '\0') {
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| 43 | if (*option == 'm') opt |= FUSER_OPT_MOUNT;
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| 44 | else if (*option == 'k') opt |= FUSER_OPT_KILL;
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| 45 | else if (*option == 's') opt |= FUSER_OPT_SILENT;
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| 46 | else if (*option == '6') opt |= FUSER_OPT_IP6;
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| 47 | else if (*option == '4') opt |= FUSER_OPT_IP4;
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| 48 | else
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| 49 | bb_error_msg_and_die("unsupported option '%c'", *option);
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[821] | 50 | ++option;
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| 51 | }
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| 52 | return opt;
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| 53 | }
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| 54 |
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| 55 | static int fuser_file_to_dev_inode(const char *filename,
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| 56 | dev_t *dev, ino_t *inode)
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| 57 | {
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| 58 | struct stat f_stat;
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[1770] | 59 | if ((stat(filename, &f_stat)) < 0)
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| 60 | return 0;
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[821] | 61 | *inode = f_stat.st_ino;
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| 62 | *dev = f_stat.st_dev;
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| 63 | return 1;
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| 64 | }
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| 65 |
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| 66 | static int fuser_find_socket_dev(dev_t *dev)
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| 67 | {
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| 68 | int fd = socket(PF_INET, SOCK_DGRAM,0);
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| 69 | struct stat buf;
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| 70 |
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| 71 | if (fd >= 0 && (fstat(fd, &buf)) == 0) {
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[1770] | 72 | *dev = buf.st_dev;
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[821] | 73 | close(fd);
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| 74 | return 1;
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| 75 | }
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| 76 | return 0;
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| 77 | }
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| 78 |
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| 79 | static int fuser_parse_net_arg(const char *filename,
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| 80 | const char **proto, int *port)
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| 81 | {
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| 82 | char path[sizeof(FUSER_PROC_DIR)+12], tproto[5];
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| 83 |
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[1770] | 84 | if ((sscanf(filename, "%d/%4s", port, tproto)) != 2)
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| 85 | return 0;
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| 86 | sprintf(path, FUSER_PROC_DIR "/net/%s", tproto);
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| 87 | if ((access(path, R_OK)) != 0)
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| 88 | return 0;
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| 89 | *proto = xstrdup(tproto);
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[821] | 90 | return 1;
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| 91 | }
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| 92 |
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| 93 | static int fuser_add_pid(pid_list *plist, pid_t pid)
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| 94 | {
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| 95 | pid_list *curr = NULL, *last = NULL;
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| 96 |
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[1770] | 97 | if (plist->pid == 0)
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| 98 | plist->pid = pid;
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[821] | 99 | curr = plist;
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[1770] | 100 | while (curr != NULL) {
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| 101 | if (curr->pid == pid)
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| 102 | return 1;
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[821] | 103 | last = curr;
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| 104 | curr = curr->next;
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| 105 | }
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[1770] | 106 | curr = xzalloc(sizeof(pid_list));
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[821] | 107 | last->next = curr;
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| 108 | curr->pid = pid;
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[1770] | 109 | /*curr->next = NULL;*/
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[821] | 110 | return 1;
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| 111 | }
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| 112 |
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| 113 | static int fuser_add_inode(inode_list *ilist, dev_t dev, ino_t inode)
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| 114 | {
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| 115 | inode_list *curr = NULL, *last = NULL;
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| 116 |
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[1770] | 117 | if (!ilist->inode && !ilist->dev) {
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[821] | 118 | ilist->dev = dev;
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| 119 | ilist->inode = inode;
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| 120 | }
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| 121 | curr = ilist;
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[1770] | 122 | while (curr != NULL) {
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| 123 | if (curr->inode == inode && curr->dev == dev)
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| 124 | return 1;
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[821] | 125 | last = curr;
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| 126 | curr = curr->next;
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| 127 | }
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[1770] | 128 | curr = xzalloc(sizeof(inode_list));
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[821] | 129 | last->next = curr;
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| 130 | curr->dev = dev;
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| 131 | curr->inode = inode;
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[1770] | 132 | /*curr->next = NULL;*/
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[821] | 133 | return 1;
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| 134 | }
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| 135 |
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| 136 | static int fuser_scan_proc_net(int opts, const char *proto,
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| 137 | int port, inode_list *ilist)
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| 138 | {
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| 139 | char path[sizeof(FUSER_PROC_DIR)+12], line[FUSER_MAX_LINE+1];
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| 140 | char addr[128];
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| 141 | ino_t tmp_inode;
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| 142 | dev_t tmp_dev;
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[1770] | 143 | long long uint64_inode;
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[821] | 144 | int tmp_port;
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| 145 | FILE *f;
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| 146 |
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[1770] | 147 | if (!fuser_find_socket_dev(&tmp_dev))
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| 148 | tmp_dev = 0;
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| 149 | sprintf(path, FUSER_PROC_DIR "/net/%s", proto);
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[821] | 150 |
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[1770] | 151 | f = fopen(path, "r");
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| 152 | if (!f)
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| 153 | return 0;
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| 154 | while (fgets(line, FUSER_MAX_LINE, f)) {
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| 155 | if (sscanf(line, "%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x %*x:%*x "
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| 156 | "%*x:%*x %*x %*d %*d %llu",
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| 157 | addr, &tmp_port, &uint64_inode) == 3
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| 158 | ) {
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| 159 | if (strlen(addr) == 8 && (opts & FUSER_OPT_IP6))
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| 160 | continue;
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| 161 | if (strlen(addr) > 8 && (opts & FUSER_OPT_IP4))
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| 162 | continue;
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| 163 | if (tmp_port == port) {
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[821] | 164 | tmp_inode = uint64_inode;
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| 165 | fuser_add_inode(ilist, tmp_dev, tmp_inode);
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| 166 | }
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| 167 | }
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| 168 | }
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| 169 | fclose(f);
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| 170 | return 1;
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| 171 | }
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| 172 |
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| 173 | static int fuser_search_dev_inode(int opts, inode_list *ilist,
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| 174 | dev_t dev, ino_t inode)
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| 175 | {
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| 176 | inode_list *curr;
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| 177 | curr = ilist;
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| 178 |
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[1770] | 179 | while (curr) {
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| 180 | if ((opts & FUSER_OPT_MOUNT) && curr->dev == dev)
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[821] | 181 | return 1;
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[1770] | 182 | if (curr->inode == inode && curr->dev == dev)
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[821] | 183 | return 1;
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| 184 | curr = curr->next;
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| 185 | }
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| 186 | return 0;
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| 187 | }
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| 188 |
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| 189 | static int fuser_scan_pid_maps(int opts, const char *fname, pid_t pid,
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| 190 | inode_list *ilist, pid_list *plist)
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| 191 | {
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| 192 | FILE *file;
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| 193 | char line[FUSER_MAX_LINE + 1];
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| 194 | int major, minor;
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| 195 | ino_t inode;
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| 196 | long long uint64_inode;
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| 197 | dev_t dev;
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| 198 |
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[1770] | 199 | file = fopen(fname, "r");
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| 200 | if (!file)
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| 201 | return 0;
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[821] | 202 | while (fgets(line, FUSER_MAX_LINE, file)) {
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[1770] | 203 | if (sscanf(line, "%*s %*s %*s %x:%x %llu", &major, &minor, &uint64_inode) != 3)
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| 204 | continue;
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[821] | 205 | inode = uint64_inode;
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[1770] | 206 | if (major == 0 && minor == 0 && inode == 0)
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| 207 | continue;
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[821] | 208 | dev = makedev(major, minor);
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[1770] | 209 | if (fuser_search_dev_inode(opts, ilist, dev, inode)) {
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[821] | 210 | fuser_add_pid(plist, pid);
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| 211 | }
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| 212 | }
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| 213 | fclose(file);
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| 214 | return 1;
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| 215 | }
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| 216 |
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| 217 | static int fuser_scan_link(int opts, const char *lname, pid_t pid,
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| 218 | inode_list *ilist, pid_list *plist)
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| 219 | {
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| 220 | ino_t inode;
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| 221 | dev_t dev;
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| 222 |
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[1770] | 223 | if (!fuser_file_to_dev_inode(lname, &dev, &inode))
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| 224 | return 0;
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| 225 | if (fuser_search_dev_inode(opts, ilist, dev, inode))
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[821] | 226 | fuser_add_pid(plist, pid);
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| 227 | return 1;
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| 228 | }
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| 229 |
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| 230 | static int fuser_scan_dir_links(int opts, const char *dname, pid_t pid,
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| 231 | inode_list *ilist, pid_list *plist)
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| 232 | {
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| 233 | DIR *d;
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| 234 | struct dirent *de;
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| 235 | char *lname;
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| 236 |
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[1770] | 237 | d = opendir(dname);
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| 238 | if (!d)
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| 239 | return 0;
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| 240 | while ((de = readdir(d)) != NULL) {
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| 241 | lname = concat_subpath_file(dname, de->d_name);
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| 242 | if (lname == NULL)
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| 243 | continue;
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| 244 | fuser_scan_link(opts, lname, pid, ilist, plist);
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| 245 | free(lname);
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[821] | 246 | }
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[1770] | 247 | closedir(d);
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[821] | 248 | return 1;
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| 249 | }
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| 250 |
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| 251 | static int fuser_scan_proc_pids(int opts, inode_list *ilist, pid_list *plist)
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| 252 | {
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| 253 | DIR *d;
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| 254 | struct dirent *de;
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| 255 | pid_t pid;
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| 256 | char *dname;
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| 257 |
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[1770] | 258 | d = opendir(FUSER_PROC_DIR);
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| 259 | if (!d)
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| 260 | return 0;
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| 261 | while ((de = readdir(d)) != NULL) {
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[821] | 262 | pid = (pid_t)atoi(de->d_name);
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[1770] | 263 | if (!pid)
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| 264 | continue;
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[821] | 265 | dname = concat_subpath_file(FUSER_PROC_DIR, de->d_name);
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[1770] | 266 | if (chdir(dname) < 0) {
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[821] | 267 | free(dname);
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| 268 | continue;
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| 269 | }
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| 270 | free(dname);
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| 271 | fuser_scan_link(opts, "cwd", pid, ilist, plist);
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| 272 | fuser_scan_link(opts, "exe", pid, ilist, plist);
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| 273 | fuser_scan_link(opts, "root", pid, ilist, plist);
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| 274 | fuser_scan_dir_links(opts, "fd", pid, ilist, plist);
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| 275 | fuser_scan_dir_links(opts, "lib", pid, ilist, plist);
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| 276 | fuser_scan_dir_links(opts, "mmap", pid, ilist, plist);
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| 277 | fuser_scan_pid_maps(opts, "maps", pid, ilist, plist);
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| 278 | chdir("..");
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| 279 | }
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| 280 | closedir(d);
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| 281 | return 1;
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| 282 | }
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| 283 |
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| 284 | static int fuser_print_pid_list(pid_list *plist)
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| 285 | {
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| 286 | pid_list *curr = plist;
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| 287 |
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[1770] | 288 | if (plist == NULL)
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| 289 | return 0;
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| 290 | while (curr != NULL) {
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| 291 | if (curr->pid > 0)
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| 292 | printf("%d ", curr->pid);
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[821] | 293 | curr = curr->next;
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| 294 | }
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[1770] | 295 | puts("");
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[821] | 296 | return 1;
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| 297 | }
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| 298 |
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| 299 | static int fuser_kill_pid_list(pid_list *plist, int sig)
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| 300 | {
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| 301 | pid_list *curr = plist;
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| 302 | pid_t mypid = getpid();
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| 303 | int success = 1;
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| 304 |
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[1770] | 305 | if (plist == NULL)
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| 306 | return 0;
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| 307 | while (curr != NULL) {
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| 308 | if (curr->pid > 0 && curr->pid != mypid) {
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[821] | 309 | if (kill(curr->pid, sig) != 0) {
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[1770] | 310 | bb_perror_msg("kill pid '%d'", curr->pid);
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[821] | 311 | success = 0;
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| 312 | }
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| 313 | }
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| 314 | curr = curr->next;
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| 315 | }
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| 316 | return success;
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| 317 | }
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| 318 |
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[1770] | 319 | int fuser_main(int argc, char **argv);
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[821] | 320 | int fuser_main(int argc, char **argv)
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| 321 | {
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[1770] | 322 | /*static -- huh???*/ int opt = 0; /* FUSER_OPT_ */
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| 323 |
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[821] | 324 | int port, i, optn;
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| 325 | int* fni; /* file name indexes of argv */
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| 326 | int fnic = 0; /* file name index count */
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| 327 | const char *proto;
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| 328 | dev_t dev;
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| 329 | ino_t inode;
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| 330 | pid_list *pids;
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| 331 | inode_list *inodes;
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| 332 | int killsig = SIGTERM;
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| 333 | int success = 1;
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| 334 |
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| 335 | if (argc < 2)
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| 336 | bb_show_usage();
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| 337 |
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| 338 | fni = xmalloc(sizeof(int));
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[1770] | 339 | for (i = 1; i < argc; i++) {
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[821] | 340 | optn = fuser_option(argv[i]);
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[1770] | 341 | if (optn)
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| 342 | opt |= optn;
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| 343 | else if (argv[i][0] == '-') {
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| 344 | killsig = get_signum(argv[i]+1);
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| 345 | if (killsig < 0)
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[821] | 346 | killsig = SIGTERM;
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[1770] | 347 | } else {
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[821] | 348 | fni = xrealloc(fni, sizeof(int) * (fnic+2));
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| 349 | fni[fnic++] = i;
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| 350 | }
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| 351 | }
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| 352 |
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[1770] | 353 | if (!fnic)
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| 354 | return 1;
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| 355 |
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[821] | 356 | inodes = xmalloc(sizeof(inode_list));
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[1770] | 357 | for (i = 0; i < fnic; i++) {
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| 358 | if (fuser_parse_net_arg(argv[fni[i]], &proto, &port)) {
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[821] | 359 | fuser_scan_proc_net(opt, proto, port, inodes);
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[1770] | 360 | } else {
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| 361 | if (!fuser_file_to_dev_inode(argv[fni[i]], &dev, &inode)) {
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| 362 | if (ENABLE_FEATURE_CLEAN_UP)
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| 363 | free(inodes);
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| 364 | bb_perror_msg_and_die("cannot open '%s'", argv[fni[i]]);
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[821] | 365 | }
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| 366 | fuser_add_inode(inodes, dev, inode);
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| 367 | }
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| 368 | }
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[1770] | 369 | pids = xmalloc(sizeof(pid_list));
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[821] | 370 | success = fuser_scan_proc_pids(opt, inodes, pids);
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| 371 | /* if the first pid in the list is 0, none have been found */
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[1770] | 372 | if (pids->pid == 0)
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| 373 | success = 0;
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| 374 | if (success) {
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| 375 | if (opt & FUSER_OPT_KILL) {
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[821] | 376 | success = fuser_kill_pid_list(pids, killsig);
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[1770] | 377 | } else if (!(opt & FUSER_OPT_SILENT)) {
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[821] | 378 | success = fuser_print_pid_list(pids);
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| 379 | }
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| 380 | }
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[1770] | 381 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 382 | free(pids);
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| 383 | free(inodes);
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| 384 | }
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[821] | 385 | /* return 0 on (success == 1) 1 otherwise */
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| 386 | return (success != 1);
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| 387 | }
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