misc-utils/lsfd.h

   1 /*
   2  * lsfd(1) - list file descriptors
   3  *
   4  * Copyright (C) 2021 Red Hat, Inc. All rights reserved.
   5  * Written by Masatake YAMATO <yamato@redhat.com>
   6  *
   7  * Very generally based on lsof(8) by Victor A. Abell <abe@purdue.edu>
   8  * It supports multiple OSes. lsfd specializes to Linux.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it would be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24 #ifndef UTIL_LINUX_LSFD_H
  25 #define UTIL_LINUX_LSFD_H
  26
  27 #include <stdbool.h>
  28 #include <sys/stat.h>
  29 #include <dirent.h>
  30 #include <inttypes.h>
  31
  32 #include "libsmartcols.h"
  33 #include "list.h"
  34 #include "nls.h"
  35 #include "path.h"
  36 #include "strutils.h"
  37 #include "xalloc.h"
  38
  39 /*
  40  * column IDs
  41  */
  42 enum {
  43         COL_AINODECLASS,
  44         COL_ASSOC,
  45         COL_BLKDRV,
  46         COL_BPF_MAP_ID,
  47         COL_BPF_MAP_TYPE,
  48         COL_BPF_MAP_TYPE_RAW,
  49         COL_BPF_NAME,
  50         COL_BPF_PROG_ID,
  51         COL_BPF_PROG_TYPE,
  52         COL_BPF_PROG_TYPE_RAW,
  53         COL_CHRDRV,
  54         COL_COMMAND,
  55         COL_DELETED,
  56         COL_DEV,
  57         COL_DEVTYPE,
  58         COL_ENDPOINTS,
  59         COL_EVENTFD_ID,
  60         COL_EVENTPOLL_TFDS,
  61         COL_FD,
  62         COL_FLAGS,
  63         COL_FUID,               /* file */
  64         COL_INET_LADDR,
  65         COL_INET_RADDR,
  66         COL_INET6_LADDR,
  67         COL_INET6_RADDR,
  68         COL_INODE,
  69         COL_INOTIFY_INODES,
  70         COL_INOTIFY_INODES_RAW,
  71         COL_KNAME,
  72         COL_KTHREAD,
  73         COL_MAJMIN,
  74         COL_MAPLEN,
  75         COL_MISCDEV,
  76         COL_MNT_ID,
  77         COL_MODE,
  78         COL_NAME,
  79         COL_NETLINK_GROUPS,
  80         COL_NETLINK_LPORT,
  81         COL_NETLINK_PROTOCOL,
  82         COL_NLINK,
  83         COL_NS_NAME,
  84         COL_NS_TYPE,
  85         COL_OWNER,              /* file */
  86         COL_PACKET_IFACE,
  87         COL_PACKET_PROTOCOL,
  88         COL_PARTITION,
  89         COL_PID,
  90         COL_PIDFD_COMM,
  91         COL_PIDFD_NSPID,
  92         COL_PIDFD_PID,
  93         COL_PING_ID,
  94         COL_POS,
  95         COL_RAW_PROTOCOL,
  96         COL_RDEV,
  97         COL_SIGNALFD_MASK,
  98         COL_SIZE,
  99         COL_SOCK_LISTENING,
 100         COL_SOCK_NETNS,
 101         COL_SOCK_PROTONAME,
 102         COL_SOCK_STATE,
 103         COL_SOCK_TYPE,
 104         COL_SOURCE,
 105         COL_STTYPE,
 106         COL_TCP_LADDR,
 107         COL_TCP_RADDR,
 108         COL_TCP_LPORT,
 109         COL_TCP_RPORT,
 110         COL_TID,
 111         COL_TIMERFD_CLOCKID,
 112         COL_TIMERFD_INTERVAL,
 113         COL_TIMERFD_REMAINING,
 114         COL_TUN_IFACE,
 115         COL_TYPE,
 116         COL_UDP_LADDR,
 117         COL_UDP_RADDR,
 118         COL_UDP_LPORT,
 119         COL_UDP_RPORT,
 120         COL_UDPLITE_LADDR,
 121         COL_UDPLITE_RADDR,
 122         COL_UDPLITE_LPORT,
 123         COL_UDPLITE_RPORT,
 124         COL_UID,                /* process */
 125         COL_UNIX_PATH,
 126         COL_USER,               /* process */
 127         COL_XMODE,
 128         LSFD_N_COLS             /* This must be at last. */
 129 };
 130
 131 /*
 132  * Process structure
 133  */
 134 enum association {
 135         ASSOC_EXE = 1,
 136         ASSOC_CWD,
 137         ASSOC_ROOT,
 138         ASSOC_NS_CGROUP,
 139         ASSOC_NS_IPC,
 140         ASSOC_NS_MNT,
 141         ASSOC_NS_NET,
 142         ASSOC_NS_PID,
 143         ASSOC_NS_PID4C,
 144         ASSOC_NS_TIME,
 145         ASSOC_NS_TIME4C,
 146         ASSOC_NS_USER,
 147         ASSOC_NS_UTS,
 148         ASSOC_MEM,              /* private file mapping */
 149         ASSOC_SHM,              /* shared file mapping */
 150         N_ASSOCS,
 151 };
 152
 153 struct proc {
 154         pid_t pid;
 155         struct proc * leader;
 156         char *command;
 157         uid_t uid;
 158         ino_t ns_mnt;
 159         struct list_head procs;
 160         struct list_head files;
 161         unsigned int kthread: 1;
 162         struct list_head eventpolls;
 163 };
 164
 165 struct proc *get_proc(pid_t pid);
 166
 167 /*
 168  * File class
 169  */
 170 struct file {
 171         struct list_head files;
 172         const struct file_class *class;
 173         int association;
 174         char *name;
 175         struct stat stat;
 176         mode_t mode;
 177         struct proc *proc;
 178
 179         uint64_t pos;
 180         uint64_t map_start;
 181         uint64_t map_end;
 182
 183         unsigned int sys_flags;
 184         unsigned int mnt_id;
 185
 186         struct {
 187                 uint8_t read:1, write:1;
 188         } locked;
 189         uint8_t multiplexed;
 190 };
 191
 192 #define is_opened_file(_f) ((_f)->association >= 0)
 193 #define is_mapped_file(_f) (is_association((_f), SHM) || is_association((_f), MEM))
 194 #define is_association(_f, a)   ((_f)->association < 0 && (_f)->association == -ASSOC_ ## a)
 195
 196 struct file_class {
 197         const struct file_class *super;
 198         size_t size;
 199         void (*initialize_class)(void);
 200         void (*finalize_class)(void);
 201         bool (*fill_column)(struct proc *proc,
 202                             struct file *file,
 203                             struct libscols_line *ln,
 204                             int column_id,
 205                             size_t column_index);
 206         int  (*handle_fdinfo)(struct file *file, const char *key, const char* value);
 207         void (*attach_xinfo)(struct file *file);
 208         void (*initialize_content)(struct file *file);
 209         void (*free_content)(struct file *file);
 210         const struct ipc_class *(*get_ipc_class)(struct file *file);
 211 };
 212
 213 extern const struct file_class file_class, cdev_class, bdev_class, sock_class, unkn_class, fifo_class,
 214         nsfs_file_class, mqueue_file_class;
 215
 216 /*
 217  * IPC
 218  */
 219 struct ipc {
 220         const struct ipc_class *class;
 221         struct list_head endpoints;
 222         struct list_head ipcs;
 223 };
 224
 225 struct ipc_endpoint {
 226         struct ipc *ipc;
 227         struct list_head endpoints;
 228 };
 229
 230 struct ipc_class {
 231         size_t size;
 232         unsigned int (*get_hash)(struct file *file);
 233         bool (*is_suitable_ipc)(struct ipc *ipc, struct file *file);
 234         void (*free)(struct ipc *ipc);
 235 };
 236
 237 struct ipc *new_ipc(const struct ipc_class *class);
 238 struct ipc *get_ipc(struct file *file);
 239 void add_ipc(struct ipc *ipc, unsigned int hash);
 240 void init_endpoint(struct ipc_endpoint *endpoint);
 241 void add_endpoint(struct ipc_endpoint *endpoint, struct ipc *ipc);
 242 #define foreach_endpoint(E,ENDPOINT) list_for_each_backwardly(E, &((ENDPOINT).ipc->endpoints))
 243
 244 enum decode_source_bit {
 245         DECODE_SOURCE_MAJMIN_BIT    = 1 << 0,
 246         DECODE_SOURCE_PARTITION_BIT = 1 << 1,
 247         DECODE_SOURCE_FILESYS_BIT   = 1 << 2,
 248 };
 249
 250 enum decode_source_level {
 251         DECODE_SOURCE_MAJMIN    = DECODE_SOURCE_MAJMIN_BIT,
 252         DECODE_SOURCE_PARTITION = DECODE_SOURCE_PARTITION_BIT | DECODE_SOURCE_MAJMIN,
 253         DECODE_SOURCE_FILESYS   = DECODE_SOURCE_FILESYS_BIT   | DECODE_SOURCE_PARTITION,
 254         DECODE_SOURCE_FULL      = DECODE_SOURCE_FILESYS,
 255 };
 256
 257 void decode_source(char *buf, size_t bufsize, unsigned int dev_major, unsigned int dev_minor,
 258                    enum decode_source_level level);
 259 /*
 260  * Name managing
 261  */
 262 struct name_manager;
 263
 264 struct name_manager *new_name_manager(void);
 265 void free_name_manager(struct name_manager *nm);
 266 const char *get_name(struct name_manager *nm, unsigned long id);
 267 unsigned long add_name(struct name_manager *nm, const char *name);
 268
 269 const char *get_partition(dev_t dev);
 270 const char *get_blkdrv(unsigned long major);
 271 const char *get_chrdrv(unsigned long major);
 272 const char *get_miscdev(unsigned long minor);
 273 const char *get_nodev_filesystem(unsigned long minor);
 274 void add_nodev(unsigned long minor, const char *filesystem);
 275
 276 static inline void xstrappend(char **a, const char *b)
 277 {
 278         if (strappend(a, b) < 0)
 279                 err(XALLOC_EXIT_CODE, _("failed to allocate memory for string"));
 280 }
 281
 282 static inline void xstrputc(char **a, char c)
 283 {
 284         char b[] = {c, '\0'};
 285         xstrappend(a, b);
 286 }
 287
 288 static inline
 289 __attribute__((__format__(printf, 2, 0)))
 290 int xstrvfappend(char **a, const char *format, va_list ap)
 291 {
 292         int ret = strvfappend(a, format, ap);
 293
 294         if (ret < 0)
 295                 err(XALLOC_EXIT_CODE, "cannot allocate string");
 296         return ret;
 297
 298 }
 299
 300 static inline
 301 __attribute__ ((__format__ (__printf__, 2, 3)))
 302 int xstrfappend(char **a, const char *format, ...)
 303 {
 304         va_list ap;
 305         int ret;
 306
 307         va_start(ap, format);
 308         ret = xstrvfappend(a, format, ap);
 309         va_end(ap);
 310
 311         return ret;
 312 }
 313
 314 /*
 315  * Net namespace
 316  */
 317 void load_sock_xinfo(struct path_cxt *pc, const char *name, ino_t netns);
 318 bool is_nsfs_dev(dev_t dev);
 319
 320 /*
 321  * POSIX Mqueue
 322  */
 323 /* 0 is assumed as the major dev for DEV. */
 324 bool is_mqueue_dev(dev_t dev);
 325
 326 /*
 327  * Eventpoll
 328  */
 329 bool is_multiplexed_by_eventpoll(int fd, struct list_head *eventpolls);
 330
 331 #endif /* UTIL_LINUX_LSFD_H */