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-rw-r--r--sys-utils/lsns.c1101
1 files changed, 1101 insertions, 0 deletions
diff --git a/sys-utils/lsns.c b/sys-utils/lsns.c
new file mode 100644
index 0000000..eec8e27
--- /dev/null
+++ b/sys-utils/lsns.c
@@ -0,0 +1,1101 @@
+/*
+ * 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,
+ LSNS_ID_TIME
+};
+
+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",
+ [LSNS_ID_TIME] = "time"
+};
+
+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
+ if (netnsid == NETNSA_NSID_NOT_ASSIGNED)
+ return xasprintf(str, "%s", "unassigned");
+#endif
+ 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, time)\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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 18:15:37 +0000