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/*
* lsns(8) - list system namespaces
*
* Copyright (C) 2015 Karel Zak <kzak@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include <stdlib.h>
#include <assert.h>
#include <dirent.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <wchar.h>
#include <libsmartcols.h>
#include <libmount.h>
#ifdef HAVE_LINUX_NET_NAMESPACE_H
#include <stdbool.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/net_namespace.h>
#endif
#include "pathnames.h"
#include "nls.h"
#include "xalloc.h"
#include "c.h"
#include "list.h"
#include "closestream.h"
#include "optutils.h"
#include "procutils.h"
#include "strutils.h"
#include "namespace.h"
#include "idcache.h"
#include "debug.h"
static UL_DEBUG_DEFINE_MASK(lsns);
UL_DEBUG_DEFINE_MASKNAMES(lsns) = UL_DEBUG_EMPTY_MASKNAMES;
#define LSNS_DEBUG_INIT (1 << 1)
#define LSNS_DEBUG_PROC (1 << 2)
#define LSNS_DEBUG_NS (1 << 3)
#define LSNS_DEBUG_ALL 0xFFFF
#define LSNS_NETNS_UNUSABLE -2
#define DBG(m, x) __UL_DBG(lsns, LSNS_DEBUG_, m, x)
#define ON_DBG(m, x) __UL_DBG_CALL(lsns, LSNS_DEBUG_, m, x)
#define UL_DEBUG_CURRENT_MASK UL_DEBUG_MASK(lsns)
#include "debugobj.h"
static struct idcache *uid_cache = NULL;
/* column IDs */
enum {
COL_NS = 0,
COL_TYPE,
COL_PATH,
COL_NPROCS,
COL_PID,
COL_PPID,
COL_COMMAND,
COL_UID,
COL_USER,
COL_NETNSID,
COL_NSFS,
};
/* column names */
struct colinfo {
const char *name; /* header */
double whint; /* width hint (N < 1 is in percent of termwidth) */
int flags; /* SCOLS_FL_* */
const char *help;
int json_type;
};
/* columns descriptions */
static const struct colinfo infos[] = {
[COL_NS] = { "NS", 10, SCOLS_FL_RIGHT, N_("namespace identifier (inode number)"), SCOLS_JSON_NUMBER },
[COL_TYPE] = { "TYPE", 5, 0, N_("kind of namespace") },
[COL_PATH] = { "PATH", 0, 0, N_("path to the namespace")},
[COL_NPROCS] = { "NPROCS", 5, SCOLS_FL_RIGHT, N_("number of processes in the namespace"), SCOLS_JSON_NUMBER },
[COL_PID] = { "PID", 5, SCOLS_FL_RIGHT, N_("lowest PID in the namespace"), SCOLS_JSON_NUMBER },
[COL_PPID] = { "PPID", 5, SCOLS_FL_RIGHT, N_("PPID of the PID"), SCOLS_JSON_NUMBER },
[COL_COMMAND] = { "COMMAND", 0, SCOLS_FL_TRUNC, N_("command line of the PID")},
[COL_UID] = { "UID", 0, SCOLS_FL_RIGHT, N_("UID of the PID"), SCOLS_JSON_NUMBER},
[COL_USER] = { "USER", 0, 0, N_("username of the PID")},
[COL_NETNSID] = { "NETNSID", 0, SCOLS_FL_RIGHT, N_("namespace ID as used by network subsystem")},
[COL_NSFS] = { "NSFS", 0, SCOLS_FL_WRAP, N_("nsfs mountpoint (usually used network subsystem)")}
};
static int columns[ARRAY_SIZE(infos) * 2];
static size_t ncolumns;
enum {
LSNS_ID_MNT = 0,
LSNS_ID_NET,
LSNS_ID_PID,
LSNS_ID_UTS,
LSNS_ID_IPC,
LSNS_ID_USER,
LSNS_ID_CGROUP
};
static char *ns_names[] = {
[LSNS_ID_MNT] = "mnt",
[LSNS_ID_NET] = "net",
[LSNS_ID_PID] = "pid",
[LSNS_ID_UTS] = "uts",
[LSNS_ID_IPC] = "ipc",
[LSNS_ID_USER] = "user",
[LSNS_ID_CGROUP] = "cgroup"
};
struct lsns_namespace {
ino_t id;
int type; /* LSNS_* */
int nprocs;
int netnsid;
struct lsns_process *proc;
struct list_head namespaces; /* lsns->processes member */
struct list_head processes; /* head of lsns_process *siblings */
};
struct lsns_process {
pid_t pid; /* process PID */
pid_t ppid; /* parent's PID */
pid_t tpid; /* thread group */
char state;
uid_t uid;
ino_t ns_ids[ARRAY_SIZE(ns_names)];
struct list_head ns_siblings[ARRAY_SIZE(ns_names)];
struct list_head processes; /* list of processes */
struct libscols_line *outline;
struct lsns_process *parent;
int netnsid;
};
struct lsns {
struct list_head processes;
struct list_head namespaces;
pid_t fltr_pid; /* filter out by PID */
ino_t fltr_ns; /* filter out by namespace */
int fltr_types[ARRAY_SIZE(ns_names)];
int fltr_ntypes;
unsigned int raw : 1,
json : 1,
tree : 1,
list : 1,
no_trunc : 1,
no_headings: 1,
no_wrap : 1;
struct libmnt_table *tab;
};
struct netnsid_cache {
ino_t ino;
int id;
struct list_head netnsids;
};
static struct list_head netnsids_cache;
static int netlink_fd = -1;
static void lsns_init_debug(void)
{
__UL_INIT_DEBUG_FROM_ENV(lsns, LSNS_DEBUG_, 0, LSNS_DEBUG);
}
static int ns_name2type(const char *name)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(ns_names); i++) {
if (strcmp(ns_names[i], name) == 0)
return i;
}
return -1;
}
static int column_name_to_id(const char *name, size_t namesz)
{
size_t i;
assert(name);
for (i = 0; i < ARRAY_SIZE(infos); i++) {
const char *cn = infos[i].name;
if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
return i;
}
warnx(_("unknown column: %s"), name);
return -1;
}
static int has_column(int id)
{
size_t i;
for (i = 0; i < ncolumns; i++) {
if (columns[i] == id)
return 1;
}
return 0;
}
static inline int get_column_id(int num)
{
assert(num >= 0);
assert((size_t) num < ncolumns);
assert(columns[num] < (int) ARRAY_SIZE(infos));
return columns[num];
}
static inline const struct colinfo *get_column_info(unsigned num)
{
return &infos[ get_column_id(num) ];
}
static int get_ns_ino(int dir, const char *nsname, ino_t *ino)
{
struct stat st;
char path[16];
snprintf(path, sizeof(path), "ns/%s", nsname);
if (fstatat(dir, path, &st, 0) != 0)
return -errno;
*ino = st.st_ino;
return 0;
}
static int parse_proc_stat(FILE *fp, pid_t *pid, char *state, pid_t *ppid)
{
char *line = NULL, *p;
size_t len = 0;
int rc;
if (getline(&line, &len, fp) < 0) {
rc = -errno;
goto error;
}
p = strrchr(line, ')');
if (p == NULL ||
sscanf(line, "%d (", pid) != 1 ||
sscanf(p, ") %c %d*[^\n]", state, ppid) != 2) {
rc = -EINVAL;
goto error;
}
rc = 0;
error:
free(line);
return rc;
}
#ifdef HAVE_LINUX_NET_NAMESPACE_H
static int netnsid_cache_find(ino_t netino, int *netnsid)
{
struct list_head *p;
list_for_each(p, &netnsids_cache) {
struct netnsid_cache *e = list_entry(p,
struct netnsid_cache,
netnsids);
if (e->ino == netino) {
*netnsid = e->id;
return 1;
}
}
return 0;
}
static void netnsid_cache_add(ino_t netino, int netnsid)
{
struct netnsid_cache *e;
e = xcalloc(1, sizeof(*e));
e->ino = netino;
e->id = netnsid;
INIT_LIST_HEAD(&e->netnsids);
list_add(&e->netnsids, &netnsids_cache);
}
static int get_netnsid_via_netlink_send_request(int target_fd)
{
unsigned char req[NLMSG_SPACE(sizeof(struct rtgenmsg))
+ RTA_SPACE(sizeof(int32_t))];
struct nlmsghdr *nlh = (struct nlmsghdr *)req;
struct rtgenmsg *rt = NLMSG_DATA(req);
struct rtattr *rta = (struct rtattr *)
(req + NLMSG_SPACE(sizeof(struct rtgenmsg)));
int32_t *fd = RTA_DATA(rta);
nlh->nlmsg_len = sizeof(req);
nlh->nlmsg_flags = NLM_F_REQUEST;
nlh->nlmsg_type = RTM_GETNSID;
rt->rtgen_family = AF_UNSPEC;
rta->rta_type = NETNSA_FD;
rta->rta_len = RTA_SPACE(sizeof(int32_t));
*fd = target_fd;
if (send(netlink_fd, req, sizeof(req), 0) < 0)
return -1;
return 0;
}
static int get_netnsid_via_netlink_recv_response(int *netnsid)
{
unsigned char res[NLMSG_SPACE(sizeof(struct rtgenmsg))
+ ((RTA_SPACE(sizeof(int32_t))
< RTA_SPACE(sizeof(struct nlmsgerr)))
? RTA_SPACE(sizeof(struct nlmsgerr))
: RTA_SPACE(sizeof(int32_t)))];
int rtalen;
ssize_t reslen;
struct nlmsghdr *nlh;
struct rtattr *rta;
reslen = recv(netlink_fd, res, sizeof(res), 0);
if (reslen < 0)
return -1;
nlh = (struct nlmsghdr *)res;
if (!(NLMSG_OK(nlh, (size_t)reslen)
&& nlh->nlmsg_type == RTM_NEWNSID))
return -1;
rtalen = NLMSG_PAYLOAD(nlh, sizeof(struct rtgenmsg));
rta = (struct rtattr *)(res + NLMSG_SPACE(sizeof(struct rtgenmsg)));
if (!(RTA_OK(rta, rtalen)
&& rta->rta_type == NETNSA_NSID))
return -1;
*netnsid = *(int *)RTA_DATA(rta);
return 0;
}
static int get_netnsid_via_netlink(int dir, const char *path)
{
int netnsid;
int target_fd;
if (netlink_fd < 0)
return LSNS_NETNS_UNUSABLE;
target_fd = openat(dir, path, O_RDONLY);
if (target_fd < 0)
return LSNS_NETNS_UNUSABLE;
if (get_netnsid_via_netlink_send_request(target_fd) < 0) {
netnsid = LSNS_NETNS_UNUSABLE;
goto out;
}
if (get_netnsid_via_netlink_recv_response(&netnsid) < 0) {
netnsid = LSNS_NETNS_UNUSABLE;
goto out;
}
out:
close(target_fd);
return netnsid;
}
static int get_netnsid(int dir, ino_t netino)
{
int netnsid;
if (!netnsid_cache_find(netino, &netnsid)) {
netnsid = get_netnsid_via_netlink(dir, "ns/net");
netnsid_cache_add(netino, netnsid);
}
return netnsid;
}
#else
static int get_netnsid(int dir __attribute__((__unused__)),
ino_t netino __attribute__((__unused__)))
{
return LSNS_NETNS_UNUSABLE;
}
#endif /* HAVE_LINUX_NET_NAMESPACE_H */
static int read_process(struct lsns *ls, pid_t pid)
{
struct lsns_process *p = NULL;
char buf[BUFSIZ];
DIR *dir;
int rc = 0, fd;
FILE *f = NULL;
size_t i;
struct stat st;
DBG(PROC, ul_debug("reading %d", (int) pid));
snprintf(buf, sizeof(buf), "/proc/%d", pid);
dir = opendir(buf);
if (!dir)
return -errno;
p = xcalloc(1, sizeof(*p));
p->netnsid = LSNS_NETNS_UNUSABLE;
if (fstat(dirfd(dir), &st) == 0) {
p->uid = st.st_uid;
add_uid(uid_cache, st.st_uid);
}
fd = openat(dirfd(dir), "stat", O_RDONLY);
if (fd < 0) {
rc = -errno;
goto done;
}
if (!(f = fdopen(fd, "r"))) {
rc = -errno;
goto done;
}
rc = parse_proc_stat(f, &p->pid, &p->state, &p->ppid);
if (rc < 0)
goto done;
rc = 0;
for (i = 0; i < ARRAY_SIZE(p->ns_ids); i++) {
INIT_LIST_HEAD(&p->ns_siblings[i]);
if (!ls->fltr_types[i])
continue;
rc = get_ns_ino(dirfd(dir), ns_names[i], &p->ns_ids[i]);
if (rc && rc != -EACCES && rc != -ENOENT)
goto done;
if (i == LSNS_ID_NET)
p->netnsid = get_netnsid(dirfd(dir), p->ns_ids[i]);
rc = 0;
}
INIT_LIST_HEAD(&p->processes);
DBG(PROC, ul_debugobj(p, "new pid=%d", p->pid));
list_add_tail(&p->processes, &ls->processes);
done:
if (f)
fclose(f);
closedir(dir);
if (rc)
free(p);
return rc;
}
static int read_processes(struct lsns *ls)
{
struct proc_processes *proc = NULL;
pid_t pid;
int rc = 0;
DBG(PROC, ul_debug("opening /proc"));
if (!(proc = proc_open_processes())) {
rc = -errno;
goto done;
}
while (proc_next_pid(proc, &pid) == 0) {
rc = read_process(ls, pid);
if (rc && rc != -EACCES && rc != -ENOENT)
break;
rc = 0;
}
done:
DBG(PROC, ul_debug("closing /proc"));
proc_close_processes(proc);
return rc;
}
static struct lsns_namespace *get_namespace(struct lsns *ls, ino_t ino)
{
struct list_head *p;
list_for_each(p, &ls->namespaces) {
struct lsns_namespace *ns = list_entry(p, struct lsns_namespace, namespaces);
if (ns->id == ino)
return ns;
}
return NULL;
}
static int namespace_has_process(struct lsns_namespace *ns, pid_t pid)
{
struct list_head *p;
list_for_each(p, &ns->processes) {
struct lsns_process *proc = list_entry(p, struct lsns_process, ns_siblings[ns->type]);
if (proc->pid == pid)
return 1;
}
return 0;
}
static struct lsns_namespace *add_namespace(struct lsns *ls, int type, ino_t ino)
{
struct lsns_namespace *ns = xcalloc(1, sizeof(*ns));
if (!ns)
return NULL;
DBG(NS, ul_debugobj(ns, "new %s[%ju]", ns_names[type], (uintmax_t)ino));
INIT_LIST_HEAD(&ns->processes);
INIT_LIST_HEAD(&ns->namespaces);
ns->type = type;
ns->id = ino;
list_add_tail(&ns->namespaces, &ls->namespaces);
return ns;
}
static int add_process_to_namespace(struct lsns *ls, struct lsns_namespace *ns, struct lsns_process *proc)
{
struct list_head *p;
DBG(NS, ul_debugobj(ns, "add process [%p] pid=%d to %s[%ju]",
proc, proc->pid, ns_names[ns->type], (uintmax_t)ns->id));
list_for_each(p, &ls->processes) {
struct lsns_process *xproc = list_entry(p, struct lsns_process, processes);
if (xproc->pid == proc->ppid) /* my parent */
proc->parent = xproc;
else if (xproc->ppid == proc->pid) /* my child */
xproc->parent = proc;
}
list_add_tail(&proc->ns_siblings[ns->type], &ns->processes);
ns->nprocs++;
if (!ns->proc || ns->proc->pid > proc->pid)
ns->proc = proc;
return 0;
}
static int cmp_namespaces(struct list_head *a, struct list_head *b,
__attribute__((__unused__)) void *data)
{
struct lsns_namespace *xa = list_entry(a, struct lsns_namespace, namespaces),
*xb = list_entry(b, struct lsns_namespace, namespaces);
return cmp_numbers(xa->id, xb->id);
}
static int netnsid_xasputs(char **str, int netnsid)
{
if (netnsid >= 0)
return xasprintf(str, "%d", netnsid);
#ifdef NETNSA_NSID_NOT_ASSIGNED
else if (netnsid == NETNSA_NSID_NOT_ASSIGNED)
return xasprintf(str, "%s", "unassigned");
#endif
else
return 0;
}
static int read_namespaces(struct lsns *ls)
{
struct list_head *p;
DBG(NS, ul_debug("reading namespace"));
list_for_each(p, &ls->processes) {
size_t i;
struct lsns_namespace *ns;
struct lsns_process *proc = list_entry(p, struct lsns_process, processes);
for (i = 0; i < ARRAY_SIZE(proc->ns_ids); i++) {
if (proc->ns_ids[i] == 0)
continue;
if (!(ns = get_namespace(ls, proc->ns_ids[i]))) {
ns = add_namespace(ls, i, proc->ns_ids[i]);
if (!ns)
return -ENOMEM;
}
add_process_to_namespace(ls, ns, proc);
}
}
list_sort(&ls->namespaces, cmp_namespaces, NULL);
return 0;
}
static int is_nsfs_root(struct libmnt_fs *fs, void *data)
{
if (!mnt_fs_match_fstype(fs, "nsfs") || !mnt_fs_get_root(fs))
return 0;
return (strcmp(mnt_fs_get_root(fs), (char *)data) == 0);
}
static int is_path_included(const char *path_set, const char *elt,
const char sep)
{
size_t elt_len;
size_t path_set_len;
char *tmp;
tmp = strstr(path_set, elt);
if (!tmp)
return 0;
elt_len = strlen(elt);
path_set_len = strlen(path_set);
/* path_set includes only elt or
* path_set includes elt as the first element.
*/
if (tmp == path_set
&& ((path_set_len == elt_len)
|| (path_set[elt_len] == sep)))
return 1;
/* path_set includes elt at the middle
* or as the last element.
*/
if ((*(tmp - 1) == sep)
&& ((*(tmp + elt_len) == sep)
|| (*(tmp + elt_len) == '\0')))
return 1;
return 0;
}
static int nsfs_xasputs(char **str,
struct lsns_namespace *ns,
struct libmnt_table *tab,
char sep)
{
struct libmnt_iter *itr = mnt_new_iter(MNT_ITER_FORWARD);
char *expected_root;
struct libmnt_fs *fs = NULL;
xasprintf(&expected_root, "%s:[%ju]", ns_names[ns->type], (uintmax_t)ns->id);
*str = NULL;
while (mnt_table_find_next_fs(tab, itr, is_nsfs_root,
expected_root, &fs) == 0) {
const char *tgt = mnt_fs_get_target(fs);
if (!*str)
xasprintf(str, "%s", tgt);
else if (!is_path_included(*str, tgt, sep)) {
char *tmp = NULL;
xasprintf(&tmp, "%s%c%s", *str, sep, tgt);
free(*str);
*str = tmp;
}
}
free(expected_root);
mnt_free_iter(itr);
return 1;
}
static void add_scols_line(struct lsns *ls, struct libscols_table *table,
struct lsns_namespace *ns, struct lsns_process *proc)
{
size_t i;
struct libscols_line *line;
assert(ns);
assert(table);
line = scols_table_new_line(table,
ls->tree && proc->parent ? proc->parent->outline : NULL);
if (!line) {
warn(_("failed to add line to output"));
return;
}
for (i = 0; i < ncolumns; i++) {
char *str = NULL;
switch (get_column_id(i)) {
case COL_NS:
xasprintf(&str, "%ju", (uintmax_t)ns->id);
break;
case COL_PID:
xasprintf(&str, "%d", (int) proc->pid);
break;
case COL_PPID:
xasprintf(&str, "%d", (int) proc->ppid);
break;
case COL_TYPE:
xasprintf(&str, "%s", ns_names[ns->type]);
break;
case COL_NPROCS:
xasprintf(&str, "%d", ns->nprocs);
break;
case COL_COMMAND:
str = proc_get_command(proc->pid);
if (!str)
str = proc_get_command_name(proc->pid);
break;
case COL_PATH:
xasprintf(&str, "/proc/%d/ns/%s", (int) proc->pid, ns_names[ns->type]);
break;
case COL_UID:
xasprintf(&str, "%d", (int) proc->uid);
break;
case COL_USER:
xasprintf(&str, "%s", get_id(uid_cache, proc->uid)->name);
break;
case COL_NETNSID:
if (ns->type == LSNS_ID_NET)
netnsid_xasputs(&str, proc->netnsid);
break;
case COL_NSFS:
nsfs_xasputs(&str, ns, ls->tab, ls->no_wrap ? ',' : '\n');
break;
default:
break;
}
if (str && scols_line_refer_data(line, i, str) != 0)
err_oom();
}
proc->outline = line;
}
static struct libscols_table *init_scols_table(struct lsns *ls)
{
struct libscols_table *tab;
size_t i;
tab = scols_new_table();
if (!tab) {
warn(_("failed to initialize output table"));
return NULL;
}
scols_table_enable_raw(tab, ls->raw);
scols_table_enable_json(tab, ls->json);
scols_table_enable_noheadings(tab, ls->no_headings);
if (ls->json)
scols_table_set_name(tab, "namespaces");
for (i = 0; i < ncolumns; i++) {
const struct colinfo *col = get_column_info(i);
int flags = col->flags;
struct libscols_column *cl;
if (ls->no_trunc)
flags &= ~SCOLS_FL_TRUNC;
if (ls->tree && get_column_id(i) == COL_COMMAND)
flags |= SCOLS_FL_TREE;
if (ls->no_wrap)
flags &= ~SCOLS_FL_WRAP;
cl = scols_table_new_column(tab, col->name, col->whint, flags);
if (cl == NULL) {
warnx(_("failed to initialize output column"));
goto err;
}
if (ls->json)
scols_column_set_json_type(cl, col->json_type);
if (!ls->no_wrap && get_column_id(i) == COL_NSFS) {
scols_column_set_wrapfunc(cl,
scols_wrapnl_chunksize,
scols_wrapnl_nextchunk,
NULL);
scols_column_set_safechars(cl, "\n");
}
}
return tab;
err:
scols_unref_table(tab);
return NULL;
}
static int show_namespaces(struct lsns *ls)
{
struct libscols_table *tab;
struct list_head *p;
int rc = 0;
tab = init_scols_table(ls);
if (!tab)
return -ENOMEM;
list_for_each(p, &ls->namespaces) {
struct lsns_namespace *ns = list_entry(p, struct lsns_namespace, namespaces);
if (ls->fltr_pid != 0 && !namespace_has_process(ns, ls->fltr_pid))
continue;
add_scols_line(ls, tab, ns, ns->proc);
}
scols_print_table(tab);
scols_unref_table(tab);
return rc;
}
static void show_process(struct lsns *ls, struct libscols_table *tab,
struct lsns_process *proc, struct lsns_namespace *ns)
{
/*
* create a tree from parent->child relation, but only if the parent is
* within the same namespace
*/
if (ls->tree
&& proc->parent
&& !proc->parent->outline
&& proc->parent->ns_ids[ns->type] == proc->ns_ids[ns->type])
show_process(ls, tab, proc->parent, ns);
add_scols_line(ls, tab, ns, proc);
}
static int show_namespace_processes(struct lsns *ls, struct lsns_namespace *ns)
{
struct libscols_table *tab;
struct list_head *p;
tab = init_scols_table(ls);
if (!tab)
return -ENOMEM;
list_for_each(p, &ns->processes) {
struct lsns_process *proc = list_entry(p, struct lsns_process, ns_siblings[ns->type]);
if (!proc->outline)
show_process(ls, tab, proc, ns);
}
scols_print_table(tab);
scols_unref_table(tab);
return 0;
}
static void __attribute__((__noreturn__)) usage(void)
{
FILE *out = stdout;
size_t i;
fputs(USAGE_HEADER, out);
fprintf(out,
_(" %s [options] [<namespace>]\n"), program_invocation_short_name);
fputs(USAGE_SEPARATOR, out);
fputs(_("List system namespaces.\n"), out);
fputs(USAGE_OPTIONS, out);
fputs(_(" -J, --json use JSON output format\n"), out);
fputs(_(" -l, --list use list format output\n"), out);
fputs(_(" -n, --noheadings don't print headings\n"), out);
fputs(_(" -o, --output <list> define which output columns to use\n"), out);
fputs(_(" --output-all output all columns\n"), out);
fputs(_(" -p, --task <pid> print process namespaces\n"), out);
fputs(_(" -r, --raw use the raw output format\n"), out);
fputs(_(" -u, --notruncate don't truncate text in columns\n"), out);
fputs(_(" -W, --nowrap don't use multi-line representation\n"), out);
fputs(_(" -t, --type <name> namespace type (mnt, net, ipc, user, pid, uts, cgroup)\n"), out);
fputs(USAGE_SEPARATOR, out);
printf(USAGE_HELP_OPTIONS(24));
fputs(USAGE_COLUMNS, out);
for (i = 0; i < ARRAY_SIZE(infos); i++)
fprintf(out, " %11s %s\n", infos[i].name, _(infos[i].help));
printf(USAGE_MAN_TAIL("lsns(8)"));
exit(EXIT_SUCCESS);
}
int main(int argc, char *argv[])
{
struct lsns ls;
int c;
int r = 0;
char *outarg = NULL;
enum {
OPT_OUTPUT_ALL = CHAR_MAX + 1
};
static const struct option long_opts[] = {
{ "json", no_argument, NULL, 'J' },
{ "task", required_argument, NULL, 'p' },
{ "help", no_argument, NULL, 'h' },
{ "output", required_argument, NULL, 'o' },
{ "output-all", no_argument, NULL, OPT_OUTPUT_ALL },
{ "notruncate", no_argument, NULL, 'u' },
{ "version", no_argument, NULL, 'V' },
{ "noheadings", no_argument, NULL, 'n' },
{ "nowrap", no_argument, NULL, 'W' },
{ "list", no_argument, NULL, 'l' },
{ "raw", no_argument, NULL, 'r' },
{ "type", required_argument, NULL, 't' },
{ NULL, 0, NULL, 0 }
};
static const ul_excl_t excl[] = { /* rows and cols in ASCII order */
{ 'J','r' },
{ 0 }
};
int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
int is_net = 0;
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
close_stdout_atexit();
lsns_init_debug();
memset(&ls, 0, sizeof(ls));
INIT_LIST_HEAD(&ls.processes);
INIT_LIST_HEAD(&ls.namespaces);
INIT_LIST_HEAD(&netnsids_cache);
while ((c = getopt_long(argc, argv,
"Jlp:o:nruhVt:W", long_opts, NULL)) != -1) {
err_exclusive_options(c, long_opts, excl, excl_st);
switch(c) {
case 'J':
ls.json = 1;
break;
case 'l':
ls.list = 1;
break;
case 'o':
outarg = optarg;
break;
case OPT_OUTPUT_ALL:
for (ncolumns = 0; ncolumns < ARRAY_SIZE(infos); ncolumns++)
columns[ncolumns] = ncolumns;
break;
case 'p':
ls.fltr_pid = strtos32_or_err(optarg, _("invalid PID argument"));
break;
case 'n':
ls.no_headings = 1;
break;
case 'r':
ls.no_wrap = ls.raw = 1;
break;
case 'u':
ls.no_trunc = 1;
break;
case 't':
{
int type = ns_name2type(optarg);
if (type < 0)
errx(EXIT_FAILURE, _("unknown namespace type: %s"), optarg);
ls.fltr_types[type] = 1;
ls.fltr_ntypes++;
if (type == LSNS_ID_NET)
is_net = 1;
break;
}
case 'W':
ls.no_wrap = 1;
break;
case 'h':
usage();
case 'V':
print_version(EXIT_SUCCESS);
default:
errtryhelp(EXIT_FAILURE);
}
}
if (!ls.fltr_ntypes) {
size_t i;
for (i = 0; i < ARRAY_SIZE(ns_names); i++)
ls.fltr_types[i] = 1;
}
if (optind < argc) {
if (ls.fltr_pid)
errx(EXIT_FAILURE, _("--task is mutually exclusive with <namespace>"));
ls.fltr_ns = strtou64_or_err(argv[optind], _("invalid namespace argument"));
ls.tree = ls.list ? 0 : 1;
if (!ncolumns) {
columns[ncolumns++] = COL_PID;
columns[ncolumns++] = COL_PPID;
columns[ncolumns++] = COL_USER;
columns[ncolumns++] = COL_COMMAND;
}
}
if (!ncolumns) {
columns[ncolumns++] = COL_NS;
columns[ncolumns++] = COL_TYPE;
columns[ncolumns++] = COL_NPROCS;
columns[ncolumns++] = COL_PID;
columns[ncolumns++] = COL_USER;
if (is_net) {
columns[ncolumns++] = COL_NETNSID;
columns[ncolumns++] = COL_NSFS;
}
columns[ncolumns++] = COL_COMMAND;
}
if (outarg && string_add_to_idarray(outarg, columns, ARRAY_SIZE(columns),
&ncolumns, column_name_to_id) < 0)
return EXIT_FAILURE;
scols_init_debug(0);
uid_cache = new_idcache();
if (!uid_cache)
err(EXIT_FAILURE, _("failed to allocate UID cache"));
#ifdef HAVE_LINUX_NET_NAMESPACE_H
if (has_column(COL_NETNSID))
netlink_fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
#endif
if (has_column(COL_NSFS)) {
ls.tab = mnt_new_table_from_file(_PATH_PROC_MOUNTINFO);
if (!ls.tab)
err(MNT_EX_FAIL, _("failed to parse %s"), _PATH_PROC_MOUNTINFO);
}
r = read_processes(&ls);
if (!r)
r = read_namespaces(&ls);
if (!r) {
if (ls.fltr_ns) {
struct lsns_namespace *ns = get_namespace(&ls, ls.fltr_ns);
if (!ns)
errx(EXIT_FAILURE, _("not found namespace: %ju"), (uintmax_t) ls.fltr_ns);
r = show_namespace_processes(&ls, ns);
} else
r = show_namespaces(&ls);
}
mnt_free_table(ls.tab);
if (netlink_fd >= 0)
close(netlink_fd);
free_idcache(uid_cache);
return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
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