busybox/procps/fuser.c

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/* vi: set sw=4 ts=4: */
/*
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* tiny fuser implementation
*
* Copyright 2004 Tony J. White
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config FUSER
//config: bool "fuser (7 kb)"
//config: default y
//config: help
//config: fuser lists all PIDs (Process IDs) that currently have a given
//config: file open. fuser can also list all PIDs that have a given network
//config: (TCP or UDP) port open.
//applet:IF_FUSER(APPLET(fuser, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_FUSER) += fuser.o
//usage:#define fuser_trivial_usage
//usage: "[OPTIONS] FILE or PORT/PROTO"
//usage:#define fuser_full_usage "\n\n"
//usage: "Find processes which use FILEs or PORTs\n"
//usage: "\n -m Find processes which use same fs as FILEs"
//usage: "\n -4,-6 Search only IPv4/IPv6 space"
//usage: "\n -s Don't display PIDs"
//usage: "\n -k Kill found processes"
//usage: "\n -SIGNAL Signal to send (default: KILL)"
#include "libbb.h"
#include "common_bufsiz.h"
#define MAX_LINE 255
#define OPTION_STRING "mks64"
enum {
OPT_MOUNT = (1 << 0),
OPT_KILL = (1 << 1),
OPT_SILENT = (1 << 2),
OPT_IP6 = (1 << 3),
OPT_IP4 = (1 << 4),
};
typedef struct inode_list {
struct inode_list *next;
ino_t inode;
dev_t dev;
} inode_list;
struct globals {
int recursion_depth;
pid_t mypid;
inode_list *inode_list_head;
smallint kill_failed;
int killsig;
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { \
setup_common_bufsiz(); \
G.mypid = getpid(); \
G.killsig = SIGKILL; \
} while (0)
static void add_inode(const struct stat *st)
{
inode_list **curr = &G.inode_list_head;
while (*curr) {
if ((*curr)->dev == st->st_dev
&& (*curr)->inode == st->st_ino
) {
return;
}
curr = &(*curr)->next;
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}
*curr = xzalloc(sizeof(inode_list));
(*curr)->dev = st->st_dev;
(*curr)->inode = st->st_ino;
}
static smallint search_dev_inode(const struct stat *st)
{
inode_list *ilist = G.inode_list_head;
while (ilist) {
if (ilist->dev == st->st_dev) {
if (option_mask32 & OPT_MOUNT)
return 1;
if (ilist->inode == st->st_ino)
return 1;
}
ilist = ilist->next;
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}
return 0;
}
enum {
PROC_NET = 0,
PROC_DIR,
PROC_DIR_LINKS,
PROC_SUBDIR_LINKS,
};
static smallint scan_proc_net_or_maps(const char *path, unsigned port)
{
FILE *f;
char line[MAX_LINE + 1], addr[68];
int major, minor, r;
long long uint64_inode;
unsigned tmp_port;
smallint retval;
struct stat statbuf;
const char *fmt;
void *fag, *sag;
f = fopen_for_read(path);
if (!f)
return 0;
if (G.recursion_depth == PROC_NET) {
int fd;
/* find socket dev */
statbuf.st_dev = 0;
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd >= 0) {
fstat(fd, &statbuf);
close(fd);
}
fmt = "%*d: %64[0-9A-Fa-f]:%x %*x:%*x %*x "
"%*x:%*x %*x:%*x %*x %*d %*d %llu";
fag = addr;
sag = &tmp_port;
} else {
fmt = "%*s %*s %*s %x:%x %llu";
fag = &major;
sag = &minor;
}
retval = 0;
while (fgets(line, MAX_LINE, f)) {
r = sscanf(line, fmt, fag, sag, &uint64_inode);
if (r != 3)
continue;
statbuf.st_ino = uint64_inode;
if (G.recursion_depth == PROC_NET) {
r = strlen(addr);
if (r == 8 && (option_mask32 & OPT_IP6))
continue;
if (r > 8 && (option_mask32 & OPT_IP4))
continue;
if (tmp_port == port)
add_inode(&statbuf);
} else {
if (major != 0 && minor != 0 && statbuf.st_ino != 0) {
statbuf.st_dev = makedev(major, minor);
retval = search_dev_inode(&statbuf);
if (retval)
break;
}
}
}
fclose(f);
return retval;
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}
static smallint scan_recursive(const char *path)
{
DIR *d;
struct dirent *d_ent;
smallint stop_scan;
smallint retval;
d = opendir(path);
if (d == NULL)
return 0;
G.recursion_depth++;
retval = 0;
stop_scan = 0;
while (!stop_scan && (d_ent = readdir(d)) != NULL) {
struct stat statbuf;
pid_t pid;
char *subpath;
subpath = concat_subpath_file(path, d_ent->d_name);
if (subpath == NULL)
continue; /* . or .. */
switch (G.recursion_depth) {
case PROC_DIR:
pid = (pid_t)bb_strtou(d_ent->d_name, NULL, 10);
if (errno != 0
|| pid == G.mypid
/* "this PID doesn't use specified FILEs or PORT/PROTO": */
|| scan_recursive(subpath) == 0
) {
break;
}
if (option_mask32 & OPT_KILL) {
if (kill(pid, G.killsig) != 0) {
bb_perror_msg("kill pid %s", d_ent->d_name);
G.kill_failed = 1;
}
}
if (!(option_mask32 & OPT_SILENT))
printf("%s ", d_ent->d_name);
retval = 1;
break;
case PROC_DIR_LINKS:
switch (
index_in_substrings(
"cwd" "\0" "exe" "\0"
"root" "\0" "fd" "\0"
"lib" "\0" "mmap" "\0"
"maps" "\0",
d_ent->d_name
)
) {
enum {
CWD_LINK,
EXE_LINK,
ROOT_LINK,
FD_DIR_LINKS,
LIB_DIR_LINKS,
MMAP_DIR_LINKS,
MAPS,
};
case CWD_LINK:
case EXE_LINK:
case ROOT_LINK:
goto scan_link;
case FD_DIR_LINKS:
case LIB_DIR_LINKS:
case MMAP_DIR_LINKS:
stop_scan = scan_recursive(subpath);
if (stop_scan)
retval = stop_scan;
break;
case MAPS:
stop_scan = scan_proc_net_or_maps(subpath, 0);
if (stop_scan)
retval = stop_scan;
default:
break;
}
break;
case PROC_SUBDIR_LINKS:
scan_link:
if (stat(subpath, &statbuf) < 0)
break;
stop_scan = search_dev_inode(&statbuf);
if (stop_scan)
retval = stop_scan;
default:
break;
}
free(subpath);
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}
closedir(d);
G.recursion_depth--;
return retval;
}
int fuser_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int fuser_main(int argc UNUSED_PARAM, char **argv)
{
char **pp;
INIT_G();
/* Handle -SIGNAL. Oh my... */
pp = argv;
while (*++pp) {
int sig;
char *arg = *pp;
if (arg[0] != '-')
continue;
if (arg[1] == '-' && arg[2] == '\0') /* "--" */
break;
if ((arg[1] == '4' || arg[1] == '6') && arg[2] == '\0')
continue; /* it's "-4" or "-6" */
sig = get_signum(&arg[1]);
if (sig < 0)
continue;
/* "-SIGNAL" option found. Remove it and bail out */
G.killsig = sig;
do {
pp[0] = arg = pp[1];
pp++;
} while (arg);
break;
}
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
getopt32(argv, "^" OPTION_STRING "\0" "-1"/*at least one arg*/);
argv += optind;
pp = argv;
while (*pp) {
/* parse net arg */
unsigned port;
char path[sizeof("/proc/net/TCP6")];
strcpy(path, "/proc/net/");
if (sscanf(*pp, "%u/%4s", &port, path + sizeof("/proc/net/")-1) == 2
&& access(path, R_OK) == 0
) {
/* PORT/PROTO */
scan_proc_net_or_maps(path, port);
} else {
/* FILE */
struct stat statbuf;
xstat(*pp, &statbuf);
add_inode(&statbuf);
}
pp++;
}
if (scan_recursive("/proc")) {
if (!(option_mask32 & OPT_SILENT))
bb_putchar('\n');
return G.kill_failed;
}
return EXIT_FAILURE;
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}