296 lines
8.6 KiB
C
296 lines
8.6 KiB
C
/*
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* Copyright (c) 2010, The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google, Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <libgen.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <pwd.h>
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#include <sys/stat.h>
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#define BUF_MAX 1024
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#define CMD_DISPLAY_MAX (9 + 1)
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#define USER_DISPLAY_MAX (10 + 1)
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struct pid_info_t {
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pid_t pid;
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char user[USER_DISPLAY_MAX];
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char cmdline[CMD_DISPLAY_MAX];
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char path[PATH_MAX];
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ssize_t parent_length;
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};
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static void print_header()
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{
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printf("%-9s %5s %10s %4s %9s %18s %9s %10s %s\n",
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"COMMAND",
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"PID",
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"USER",
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"FD",
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"TYPE",
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"DEVICE",
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"SIZE/OFF",
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"NODE",
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"NAME");
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}
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static void print_symlink(const char* name, const char* path, struct pid_info_t* info)
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{
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static ssize_t link_dest_size;
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static char link_dest[PATH_MAX];
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strlcat(info->path, path, sizeof(info->path));
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if ((link_dest_size = readlink(info->path, link_dest, sizeof(link_dest)-1)) < 0) {
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if (errno == ENOENT)
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goto out;
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snprintf(link_dest, sizeof(link_dest), "%s (readlink: %s)", info->path, strerror(errno));
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} else {
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link_dest[link_dest_size] = '\0';
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}
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// Things that are just the root filesystem are uninteresting (we already know)
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if (!strcmp(link_dest, "/"))
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goto out;
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const char* fd = name;
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char rw = ' ';
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char locks = ' '; // TODO: read /proc/locks
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const char* type = "unknown";
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char device[32] = "?";
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char size_off[32] = "?";
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char node[32] = "?";
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struct stat sb;
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if (lstat(link_dest, &sb) != -1) {
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switch ((sb.st_mode & S_IFMT)) {
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case S_IFSOCK: type = "sock"; break; // TODO: what domain?
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case S_IFLNK: type = "LINK"; break;
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case S_IFREG: type = "REG"; break;
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case S_IFBLK: type = "BLK"; break;
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case S_IFDIR: type = "DIR"; break;
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case S_IFCHR: type = "CHR"; break;
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case S_IFIFO: type = "FIFO"; break;
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}
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snprintf(device, sizeof(device), "%d,%d", (int) sb.st_dev, (int) sb.st_rdev);
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snprintf(node, sizeof(node), "%d", (int) sb.st_ino);
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snprintf(size_off, sizeof(size_off), "%d", (int) sb.st_size);
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}
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if (!name) {
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// We're looking at an fd, so read its flags.
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fd = path;
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char fdinfo_path[PATH_MAX];
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snprintf(fdinfo_path, sizeof(fdinfo_path), "/proc/%d/fdinfo/%s", info->pid, path);
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FILE* fp = fopen(fdinfo_path, "r");
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if (fp != NULL) {
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int pos;
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unsigned flags;
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if (fscanf(fp, "pos: %d flags: %o", &pos, &flags) == 2) {
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flags &= O_ACCMODE;
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if (flags == O_RDONLY) rw = 'r';
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else if (flags == O_WRONLY) rw = 'w';
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else rw = 'u';
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}
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fclose(fp);
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}
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}
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printf("%-9s %5d %10s %4s%c%c %9s %18s %9s %10s %s\n",
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info->cmdline, info->pid, info->user, fd, rw, locks, type, device, size_off, node, link_dest);
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out:
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info->path[info->parent_length] = '\0';
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}
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// Prints out all file that have been memory mapped
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static void print_maps(struct pid_info_t* info)
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{
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FILE *maps;
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size_t offset;
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char device[10];
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long int inode;
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char file[PATH_MAX];
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strlcat(info->path, "maps", sizeof(info->path));
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maps = fopen(info->path, "r");
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if (!maps)
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goto out;
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while (fscanf(maps, "%*x-%*x %*s %zx %s %ld %s\n", &offset, device, &inode, file) == 4) {
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// We don't care about non-file maps
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if (inode == 0 || !strcmp(device, "00:00"))
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continue;
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printf("%-9s %5d %10s %4s %9s %18s %9zd %10ld %s\n",
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info->cmdline, info->pid, info->user, "mem",
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"REG", device, offset, inode, file);
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}
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fclose(maps);
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out:
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info->path[info->parent_length] = '\0';
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}
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// Prints out all open file descriptors
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static void print_fds(struct pid_info_t* info)
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{
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static char* fd_path = "fd/";
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strlcat(info->path, fd_path, sizeof(info->path));
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int previous_length = info->parent_length;
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info->parent_length += strlen(fd_path);
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DIR *dir = opendir(info->path);
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if (dir == NULL) {
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char msg[BUF_MAX];
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snprintf(msg, sizeof(msg), "%s (opendir: %s)", info->path, strerror(errno));
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printf("%-9s %5d %10s %4s %9s %18s %9s %10s %s\n",
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info->cmdline, info->pid, info->user, "FDS",
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"", "", "", "", msg);
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goto out;
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}
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struct dirent* de;
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while ((de = readdir(dir))) {
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if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
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continue;
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print_symlink(NULL, de->d_name, info);
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}
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closedir(dir);
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out:
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info->parent_length = previous_length;
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info->path[info->parent_length] = '\0';
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}
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static void lsof_dumpinfo(pid_t pid)
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{
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int fd;
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struct pid_info_t info;
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struct stat pidstat;
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struct passwd *pw;
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info.pid = pid;
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snprintf(info.path, sizeof(info.path), "/proc/%d/", pid);
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info.parent_length = strlen(info.path);
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// Get the UID by calling stat on the proc/pid directory.
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if (!stat(info.path, &pidstat)) {
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pw = getpwuid(pidstat.st_uid);
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if (pw) {
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strlcpy(info.user, pw->pw_name, sizeof(info.user));
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} else {
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snprintf(info.user, USER_DISPLAY_MAX, "%d", (int)pidstat.st_uid);
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}
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} else {
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strcpy(info.user, "???");
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}
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// Read the command line information; each argument is terminated with NULL.
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strlcat(info.path, "cmdline", sizeof(info.path));
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fd = open(info.path, O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "Couldn't read %s\n", info.path);
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return;
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}
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char cmdline[PATH_MAX];
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int numRead = read(fd, cmdline, sizeof(cmdline) - 1);
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close(fd);
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if (numRead < 0) {
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fprintf(stderr, "Error reading cmdline: %s: %s\n", info.path, strerror(errno));
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return;
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}
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cmdline[numRead] = '\0';
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// We only want the basename of the cmdline
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strlcpy(info.cmdline, basename(cmdline), sizeof(info.cmdline));
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// Read each of these symlinks
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print_symlink("cwd", "cwd", &info);
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print_symlink("txt", "exe", &info);
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print_symlink("rtd", "root", &info);
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print_fds(&info);
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print_maps(&info);
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}
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int lsof_main(int argc, char *argv[])
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{
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long int pid = 0;
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char* endptr;
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if (argc == 2) {
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pid = strtol(argv[1], &endptr, 10);
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}
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print_header();
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if (pid) {
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lsof_dumpinfo(pid);
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} else {
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DIR *dir = opendir("/proc");
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if (dir == NULL) {
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fprintf(stderr, "Couldn't open /proc\n");
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return -1;
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}
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struct dirent* de;
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while ((de = readdir(dir))) {
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if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
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continue;
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// Only inspect directories that are PID numbers
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pid = strtol(de->d_name, &endptr, 10);
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if (*endptr != '\0')
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continue;
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lsof_dumpinfo(pid);
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}
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closedir(dir);
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}
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return 0;
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}
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