1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini lsof implementation for busybox
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4 | *
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5 | * Copyright (C) 2012 by Sven Oliver 'SvOlli' Moll <svolli@svolli.de>
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6 | *
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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | //config:config LSOF
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11 | //config: bool "lsof"
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12 | //config: default y
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13 | //config: help
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14 | //config: Show open files in the format of:
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15 | //config: PID <TAB> /path/to/executable <TAB> /path/to/opened/file
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16 |
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17 | //applet:IF_LSOF(APPLET(lsof, BB_DIR_USR_BIN, BB_SUID_DROP))
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18 |
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19 | //kbuild:lib-$(CONFIG_LSOF) += lsof.o
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20 |
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21 | //usage:#define lsof_trivial_usage
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22 | //usage: ""
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23 | //usage:#define lsof_full_usage "\n\n"
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24 | //usage: "Show all open files"
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25 |
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26 | #include "libbb.h"
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27 |
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28 | /*
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29 | * Examples of "standard" lsof output:
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30 | *
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31 | * COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
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32 | * init 1 root cwd DIR 8,5 4096 2 /
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33 | * init 1 root rtd DIR 8,5 4096 2 /
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34 | * init 1 root txt REG 8,5 872400 63408 /app/busybox-1.19.2/busybox
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35 | * rpc.portm 1064 root mem REG 8,5 43494 47451 /app/glibc-2.11/lib/libnss_files-2.11.so
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36 | * rpc.portm 1064 root 3u IPv4 2178 UDP *:111
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37 | * rpc.portm 1064 root 4u IPv4 1244 TCP *:111 (LISTEN)
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38 | * runsvdir 1116 root 0r CHR 1,3 1214 /dev/null
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39 | * runsvdir 1116 root 1w CHR 1,3 1214 /dev/null
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40 | * runsvdir 1116 root 2w CHR 1,3 1214 /dev/null
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41 | * runsvdir 1116 root 3r DIR 8,6 1560 58359 /.local/var/service
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42 | * gpm 1128 root 4u unix 0xffff88007c09ccc0 1302 /dev/gpmctl
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43 | */
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44 |
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45 | int lsof_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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46 | int lsof_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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47 | {
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48 | procps_status_t *proc = NULL;
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49 |
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50 | while ((proc = procps_scan(proc, PSSCAN_PID|PSSCAN_EXE)) != NULL) {
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51 | char name[sizeof("/proc/%u/fd/0123456789") + sizeof(int)*3];
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52 | unsigned baseofs;
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53 | DIR *d_fd;
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54 | char *fdlink;
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55 | struct dirent *entry;
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56 |
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57 | if (getpid() == proc->pid)
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58 | continue;
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59 |
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60 | baseofs = sprintf(name, "/proc/%u/fd/", proc->pid);
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61 | d_fd = opendir(name);
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62 | if (d_fd) {
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63 | while ((entry = readdir(d_fd)) != NULL) {
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64 | /* Skip entries '.' and '..' (and any hidden file) */
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65 | if (entry->d_name[0] == '.')
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66 | continue;
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67 |
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68 | safe_strncpy(name + baseofs, entry->d_name, 10);
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69 | if ((fdlink = xmalloc_readlink(name)) != NULL) {
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70 | printf("%d\t%s\t%s\n", proc->pid, proc->exe, fdlink);
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71 | free(fdlink);
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72 | }
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73 | }
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74 | closedir(d_fd);
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75 | }
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76 | }
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77 |
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78 | return EXIT_SUCCESS;
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79 | }
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