/* lsof.c - list open files.
*
* Copyright 2015 The Android Open Source Project
USE_LSOF(NEWTOY(lsof, "lp*t", TOYFLAG_USR|TOYFLAG_BIN))
config LSOF
bool "lsof"
default n
help
usage: lsof [-lt] [-p PID1,PID2,...] [FILE...]
List all open files belonging to all active processes, or processes using
listed FILE(s).
-l list uids numerically
-p for given comma-separated pids only (default all pids)
-t terse (pid only) output
*/
#define FOR_lsof
#include "toys.h"
GLOBALS(
struct arg_list *p;
struct stat *sought_files;
struct double_list *all_sockets, *files;
int last_shown_pid, shown_header;
)
struct proc_info {
char cmd[17];
int pid, uid;
};
struct file_info {
char *next, *prev;
// For output.
struct proc_info pi;
char *name, fd[8], rw, locks, type[10], device[32], size_off[32], node[32];
// For filtering.
dev_t st_dev;
ino_t st_ino;
};
static void print_info(void *data)
{
struct file_info *fi = data;
// Filter matches
if (toys.optc) {
int i;
for (i = 0; i<toys.optc; i++)
if (TT.sought_files[i].st_dev==fi->st_dev)
if (TT.sought_files[i].st_ino==fi->st_ino) break;
if (i==toys.optc) return;
}
if (toys.optflags&FLAG_t) {
if (fi->pi.pid != TT.last_shown_pid)
printf("%d\n", TT.last_shown_pid = fi->pi.pid);
} else {
if (!TT.shown_header) {
// TODO: llist_traverse to measure the columns first.
printf("%-9s %5s %10.10s %4s %7s %18s %9s %10s %s\n", "COMMAND", "PID",
"USER", "FD", "TYPE", "DEVICE", "SIZE/OFF", "NODE", "NAME");
TT.shown_header = 1;
}
printf("%-9s %5d %10.10s %4s%c%c %7s %18s %9s %10s %s\n",
fi->pi.cmd, fi->pi.pid, getusername(fi->pi.uid),
fi->fd, fi->rw, fi->locks, fi->type, fi->device, fi->size_off,
fi->node, fi->name);
}
}
static void free_info(void *data)
{
free(((struct file_info *)data)->name);
free(data);
}
static void fill_flags(struct file_info *fi)
{
FILE* fp;
long long pos;
unsigned flags;
snprintf(toybuf, sizeof(toybuf), "/proc/%d/fdinfo/%s", fi->pi.pid, fi->fd);
fp = fopen(toybuf, "r");
if (!fp) return;
if (fscanf(fp, "pos: %lld flags: %o", &pos, &flags) == 2) {
flags &= O_ACCMODE;
if (flags == O_RDONLY) fi->rw = 'r';
else if (flags == O_WRONLY) fi->rw = 'w';
else fi->rw = 'u';
snprintf(fi->size_off, sizeof(fi->size_off), "0t%lld", pos);
}
fclose(fp);
}
static void scan_proc_net_file(char *path, int family, char type,
void (*fn)(char *, int, char))
{
FILE *fp = fopen(path, "r");
char *line = NULL;
size_t line_length = 0;
if (!fp) return;
if (!getline(&line, &line_length, fp)) return; // Skip header.
while (getline(&line, &line_length, fp) > 0) {
fn(line, family, type);
}
free(line);
fclose(fp);
}
static struct file_info *add_socket(ino_t inode, const char *type)
{
struct file_info *fi = xzalloc(sizeof(struct file_info));
dlist_add_nomalloc(&TT.all_sockets, (struct double_list *)fi);
fi->st_ino = inode;
strcpy(fi->type, type);
return fi;
}
static void scan_unix(char *line, int af, char type)
{
long inode;
int path_pos;
if (sscanf(line, "%*p: %*X %*X %*X %*X %*X %lu %n", &inode, &path_pos) >= 1) {
struct file_info *fi = add_socket(inode, "unix");
char *name = chomp(line + path_pos);
fi->name = strdup(*name ? name : "socket");
}
}
static void scan_netlink(char *line, int af, char type)
{
unsigned state;
long inode;
char *netlink_states[] = {
"ROUTE", "UNUSED", "USERSOCK", "FIREWALL", "SOCK_DIAG", "NFLOG", "XFRM",
"SELINUX", "ISCSI", "AUDIT", "FIB_LOOKUP", "CONNECTOR", "NETFILTER",
"IP6_FW", "DNRTMSG", "KOBJECT_UEVENT", "GENERIC", "DM", "SCSITRANSPORT",
"ENCRYPTFS", "RDMA", "CRYPTO"
};
if (sscanf(line, "%*p %u %*u %*x %*u %*u %*u %*u %*u %lu", &state, &inode)<2)
return;
struct file_info *fi = add_socket(inode, "netlink");
fi->name =
strdup(state < ARRAY_LEN(netlink_states) ? netlink_states[state] : "?");
}
static void scan_ip(char *line, int af, char type)
{
char *tcp_states[] = {
"UNKNOWN", "ESTABLISHED", "SYN_SENT", "SYN_RECV", "FIN_WAIT1", "FIN_WAIT2",
"TIME_WAIT", "CLOSE", "CLOSE_WAIT", "LAST_ACK", "LISTEN", "CLOSING"
};
char local_ip[INET6_ADDRSTRLEN] = {0};
char remote_ip[INET6_ADDRSTRLEN] = {0};
struct in6_addr local, remote;
int local_port, remote_port, state;
long inode;
int ok;
if (af == 4) {
ok = sscanf(line, " %*d: %x:%x %x:%x %x %*x:%*x %*X:%*X %*X %*d %*d %ld",
&(local.s6_addr32[0]), &local_port,
&(remote.s6_addr32[0]), &remote_port,
&state, &inode) == 6;
} else {
ok = sscanf(line, " %*d: %8x%8x%8x%8x:%x %8x%8x%8x%8x:%x %x "
"%*x:%*x %*X:%*X %*X %*d %*d %ld",
&(local.s6_addr32[0]), &(local.s6_addr32[1]),
&(local.s6_addr32[2]), &(local.s6_addr32[3]),
&local_port,
&(remote.s6_addr32[0]), &(remote.s6_addr32[1]),
&(remote.s6_addr32[2]), &(remote.s6_addr32[3]),
&remote_port, &state, &inode) == 12;
}
if (!ok) return;
struct file_info *fi = add_socket(inode, af == 4 ? "IPv4" : "IPv6");
inet_ntop(af, &local, local_ip, sizeof(local_ip));
inet_ntop(af, &remote, remote_ip, sizeof(remote_ip));
if (type == 't') {
if (state < 0 || state > TCP_CLOSING) state = 0;
fi->name = xmprintf(af == 4 ?
"TCP %s:%d->%s:%d (%s)" :
"TCP [%s]:%d->[%s]:%d (%s)",
local_ip, local_port, remote_ip, remote_port,
tcp_states[state]);
} else {
fi->name = xmprintf(af == 4 ? "%s %s:%d->%s:%d" : "%s [%s]:%d->[%s]:%d",
type == 'u' ? "UDP" : "RAW",
local_ip, local_port, remote_ip, remote_port);
}
}
static int find_socket(struct file_info *fi, long inode)
{
static int cached;
if (!cached) {
scan_proc_net_file("/proc/net/tcp", 4, 't', scan_ip);
scan_proc_net_file("/proc/net/tcp6", 6, 't', scan_ip);
scan_proc_net_file("/proc/net/udp", 4, 'u', scan_ip);
scan_proc_net_file("/proc/net/udp6", 6, 'u', scan_ip);
scan_proc_net_file("/proc/net/raw", 4, 'r', scan_ip);
scan_proc_net_file("/proc/net/raw6", 6, 'r', scan_ip);
scan_proc_net_file("/proc/net/unix", 0, 0, scan_unix);
scan_proc_net_file("/proc/net/netlink", 0, 0, scan_netlink);
cached = 1;
}
void* list = TT.all_sockets;
while (list) {
struct file_info *s = (struct file_info*) llist_pop(&list);
if (s->st_ino == inode) {
fi->name = s->name ? strdup(s->name) : NULL;
strcpy(fi->type, s->type);
return 1;
}
if (list == TT.all_sockets) break;
}
return 0;
}
static void fill_stat(struct file_info *fi, const char *path)
{
struct stat sb;
long dev;
if (stat(path, &sb)) return;
// Fill TYPE.
switch ((sb.st_mode & S_IFMT)) {
case S_IFBLK: strcpy(fi->type, "BLK"); break;
case S_IFCHR: strcpy(fi->type, "CHR"); break;
case S_IFDIR: strcpy(fi->type, "DIR"); break;
case S_IFIFO: strcpy(fi->type, "FIFO"); break;
case S_IFLNK: strcpy(fi->type, "LINK"); break;
case S_IFREG: strcpy(fi->type, "REG"); break;
case S_IFSOCK: strcpy(fi->type, "sock"); break;
default:
snprintf(fi->type, sizeof(fi->type), "0%03o", sb.st_mode & S_IFMT);
break;
}
if (S_ISSOCK(sb.st_mode)) find_socket(fi, sb.st_ino);
// Fill DEVICE.
dev = (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) ? sb.st_rdev : sb.st_dev;
if (!S_ISSOCK(sb.st_mode))
snprintf(fi->device, sizeof(fi->device), "%d,%d",
dev_major(dev), dev_minor(dev));
// Fill SIZE/OFF.
if (S_ISREG(sb.st_mode) || S_ISDIR(sb.st_mode))
snprintf(fi->size_off, sizeof(fi->size_off), "%lld",
(long long)sb.st_size);
// Fill NODE.
snprintf(fi->node, sizeof(fi->node), "%ld", (long)sb.st_ino);
// Stash st_dev and st_ino for filtering.
fi->st_dev = sb.st_dev;
fi->st_ino = sb.st_ino;
}
struct file_info *new_file_info(struct proc_info *pi, const char *fd)
{
struct file_info *fi = xzalloc(sizeof(struct file_info));
dlist_add_nomalloc(&TT.files, (struct double_list *)fi);
fi->pi = *pi;
// Defaults.
strcpy(fi->fd, fd);
strcpy(fi->type, "unknown");
fi->rw = fi->locks = ' ';
return fi;
}
static void visit_symlink(struct proc_info *pi, char *name, char *path)
{
struct file_info *fi = new_file_info(pi, "");
// Get NAME.
if (name) { // "/proc/pid/[cwd]".
snprintf(fi->fd, sizeof(fi->fd), "%s", name);
snprintf(toybuf, sizeof(toybuf), "/proc/%d/%s", pi->pid, path);
} else { // "/proc/pid/fd/[3]"
snprintf(fi->fd, sizeof(fi->fd), "%s", path);
fill_flags(fi); // Clobbers toybuf.
snprintf(toybuf, sizeof(toybuf), "/proc/%d/fd/%s", pi->pid, path);
}
// TODO: code called by fill_stat would be easier to write if we didn't
// rely on toybuf being preserved here.
fill_stat(fi, toybuf);
if (!fi->name) { // We already have a name for things like sockets.
fi->name = xreadlink(toybuf);
if (!fi->name) {
fi->name = xmprintf("%s (readlink: %s)", toybuf, strerror(errno));
}
}
}
static void visit_maps(struct proc_info *pi)
{
FILE *fp;
unsigned long long offset;
char device[10];
long inode;
char *line = NULL;
size_t line_length = 0;
snprintf(toybuf, sizeof(toybuf), "/proc/%d/maps", pi->pid);
fp = fopen(toybuf, "r");
if (!fp) return;
while (getline(&line, &line_length, fp) > 0) {
int name_pos;
if (sscanf(line, "%*x-%*x %*s %llx %s %ld %n",
&offset, device, &inode, &name_pos) >= 3) {
struct file_info *fi;
// Ignore non-file maps.
if (inode == 0 || !strcmp(device, "00:00")) continue;
// TODO: show unique maps even if they have a non-zero offset?
if (offset != 0) continue;
fi = new_file_info(pi, "mem");
fi->name = strdup(chomp(line + name_pos));
fill_stat(fi, fi->name);
}
}
free(line);
fclose(fp);
}
static void visit_fds(struct proc_info *pi)
{
DIR *dir;
struct dirent *de;
snprintf(toybuf, sizeof(toybuf), "/proc/%d/fd", pi->pid);
if (!(dir = opendir(toybuf))) {
struct file_info *fi = new_file_info(pi, "NOFD");
fi->name = xmprintf("%s (opendir: %s)", toybuf, strerror(errno));
return;
}
while ((de = readdir(dir))) {
if (*de->d_name == '.') continue;
visit_symlink(pi, NULL, de->d_name);
}
closedir(dir);
}
static void lsof_pid(int pid, struct stat *st)
{
struct proc_info pi;
struct stat sb;
char *s;
pi.pid = pid;
// Skip nonexistent pids
sprintf(toybuf, "/proc/%d/stat", pid);
if (!readfile(toybuf, toybuf, sizeof(toybuf)-1) || !(s = strchr(toybuf, '(')))
return;
memcpy(pi.cmd, s+1, sizeof(pi.cmd)-1);
pi.cmd[sizeof(pi.cmd)-1] = 0;
if ((s = strrchr(pi.cmd, ')'))) *s = 0;
// Get USER.
if (!st) {
snprintf(toybuf, sizeof(toybuf), "/proc/%d", pid);
if (stat(toybuf, st = &sb)) return;
}
pi.uid = st->st_uid;
visit_symlink(&pi, "cwd", "cwd");
visit_symlink(&pi, "rtd", "root");
visit_symlink(&pi, "txt", "exe");
visit_maps(&pi);
visit_fds(&pi);
}
static int scan_proc(struct dirtree *node)
{
int pid;
if (!node->parent) return DIRTREE_RECURSE|DIRTREE_SHUTUP;
if ((pid = atol(node->name))) lsof_pid(pid, &node->st);
return 0;
}
void lsof_main(void)
{
struct arg_list *pp;
int i, pid;
// lsof will only filter on paths it can stat (because it filters by inode).
if (toys.optc) {
TT.sought_files = xmalloc(toys.optc*sizeof(struct stat));
for (i = 0; i<toys.optc; ++i) xstat(toys.optargs[i], TT.sought_files+i);
}
if (!TT.p) dirtree_read("/proc", scan_proc);
else for (pp = TT.p; pp; pp = pp->next) {
char *start, *end, *next = pp->arg;
while ((start = comma_iterate(&next, &i))) {
if ((pid = strtol(start, &end, 10))<1 || (*end && *end!=','))
error_msg("bad -p '%.*s'", (int)(end-start), start);
lsof_pid(pid, 0);
}
}
llist_traverse(TT.files, print_info);
if (CFG_TOYBOX_FREE) {
llist_traverse(TT.files, free_info);
llist_traverse(TT.all_sockets, free_info);
}
}