mirror of
https://github.com/sheumann/hush.git
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701 lines
17 KiB
C
701 lines
17 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini syslogd implementation for busybox
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org>
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*
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* "circular buffer" Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>
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*
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* Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <netdb.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <time.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <sys/param.h>
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#include "busybox.h"
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/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
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#define SYSLOG_NAMES
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#include <sys/syslog.h>
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#include <sys/uio.h>
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/* Path for the file where all log messages are written */
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#define __LOG_FILE "/var/log/messages"
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/* Path to the unix socket */
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static char lfile[MAXPATHLEN];
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static const char *logFilePath = __LOG_FILE;
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#ifdef CONFIG_FEATURE_ROTATE_LOGFILE
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/* max size of message file before being rotated */
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static int logFileSize = 200 * 1024;
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/* number of rotated message files */
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static int logFileRotate = 1;
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#endif
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/* interval between marks in seconds */
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static int MarkInterval = 20 * 60;
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/* localhost's name */
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static char LocalHostName[64];
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#ifdef CONFIG_FEATURE_REMOTE_LOG
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#include <netinet/in.h>
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/* udp socket for logging to remote host */
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static int remotefd = -1;
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static struct sockaddr_in remoteaddr;
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/* where do we log? */
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static char *RemoteHost;
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/* what port to log to? */
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static int RemotePort = 514;
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/* To remote log or not to remote log, that is the question. */
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static int doRemoteLog = FALSE;
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static int local_logging = FALSE;
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#endif
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/* Make loging output smaller. */
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static bool small = false;
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#define MAXLINE 1024 /* maximum line length */
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/* circular buffer variables/structures */
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#ifdef CONFIG_FEATURE_IPC_SYSLOG
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#if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4
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#error Sorry, you must set the syslogd buffer size to at least 4KB.
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#error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE
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#endif
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#include <sys/ipc.h>
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#include <sys/sem.h>
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#include <sys/shm.h>
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/* our shared key */
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static const long KEY_ID = 0x414e4547; /*"GENA" */
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// Semaphore operation structures
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static struct shbuf_ds {
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int size; // size of data written
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int head; // start of message list
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int tail; // end of message list
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char data[1]; // data/messages
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} *buf = NULL; // shared memory pointer
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static struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} }; // set SMwup
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static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} }; // set SMwdn
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static int shmid = -1; // ipc shared memory id
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static int s_semid = -1; // ipc semaphore id
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static int shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024); // default shm size
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static int circular_logging = FALSE;
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/*
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* sem_up - up()'s a semaphore.
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*/
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static inline void sem_up(int semid)
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{
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if (semop(semid, SMwup, 1) == -1) {
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bb_perror_msg_and_die("semop[SMwup]");
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}
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}
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/*
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* sem_down - down()'s a semaphore
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*/
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static inline void sem_down(int semid)
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{
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if (semop(semid, SMwdn, 3) == -1) {
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bb_perror_msg_and_die("semop[SMwdn]");
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}
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}
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static void ipcsyslog_cleanup(void)
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{
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printf("Exiting Syslogd!\n");
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if (shmid != -1) {
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shmdt(buf);
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}
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if (shmid != -1) {
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shmctl(shmid, IPC_RMID, NULL);
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}
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if (s_semid != -1) {
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semctl(s_semid, 0, IPC_RMID, 0);
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}
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}
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static void ipcsyslog_init(void)
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{
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if (buf == NULL) {
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if ((shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023)) == -1) {
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bb_perror_msg_and_die("shmget");
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}
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if ((buf = shmat(shmid, NULL, 0)) == NULL) {
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bb_perror_msg_and_die("shmat");
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}
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buf->size = shm_size - sizeof(*buf);
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buf->head = buf->tail = 0;
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// we'll trust the OS to set initial semval to 0 (let's hope)
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if ((s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023)) == -1) {
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if (errno == EEXIST) {
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if ((s_semid = semget(KEY_ID, 2, 0)) == -1) {
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bb_perror_msg_and_die("semget");
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}
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} else {
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bb_perror_msg_and_die("semget");
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}
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}
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} else {
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printf("Buffer already allocated just grab the semaphore?");
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}
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}
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/* write message to buffer */
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static void circ_message(const char *msg)
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{
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int l = strlen(msg) + 1; /* count the whole message w/ '\0' included */
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sem_down(s_semid);
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/*
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* Circular Buffer Algorithm:
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* --------------------------
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*
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* Start-off w/ empty buffer of specific size SHM_SIZ
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* Start filling it up w/ messages. I use '\0' as separator to break up messages.
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* This is also very handy since we can do printf on message.
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*
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* Once the buffer is full we need to get rid of the first message in buffer and
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* insert the new message. (Note: if the message being added is >1 message then
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* we will need to "remove" >1 old message from the buffer). The way this is done
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* is the following:
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* When we reach the end of the buffer we set a mark and start from the beginning.
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* Now what about the beginning and end of the buffer? Well we have the "head"
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* index/pointer which is the starting point for the messages and we have "tail"
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* index/pointer which is the ending point for the messages. When we "display" the
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* messages we start from the beginning and continue until we reach "tail". If we
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* reach end of buffer, then we just start from the beginning (offset 0). "head" and
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* "tail" are actually offsets from the beginning of the buffer.
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*
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* Note: This algorithm uses Linux IPC mechanism w/ shared memory and semaphores to provide
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* a threasafe way of handling shared memory operations.
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*/
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if ((buf->tail + l) < buf->size) {
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/* before we append the message we need to check the HEAD so that we won't
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overwrite any of the message that we still need and adjust HEAD to point
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to the next message! */
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if (buf->tail < buf->head) {
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if ((buf->tail + l) >= buf->head) {
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/* we need to move the HEAD to point to the next message
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* Theoretically we have enough room to add the whole message to the
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* buffer, because of the first outer IF statement, so we don't have
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* to worry about overflows here!
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*/
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int k = buf->tail + l - buf->head; /* we need to know how many bytes
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we are overwriting to make
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enough room */
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char *c =
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memchr(buf->data + buf->head + k, '\0',
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buf->size - (buf->head + k));
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if (c != NULL) { /* do a sanity check just in case! */
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buf->head = c - buf->data + 1; /* we need to convert pointer to
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offset + skip the '\0' since
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we need to point to the beginning
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of the next message */
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/* Note: HEAD is only used to "retrieve" messages, it's not used
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when writing messages into our buffer */
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} else { /* show an error message to know we messed up? */
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printf("Weird! Can't find the terminator token??? \n");
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buf->head = 0;
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}
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}
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}
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/* in other cases no overflows have been done yet, so we don't care! */
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/* we should be ok to append the message now */
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strncpy(buf->data + buf->tail, msg, l); /* append our message */
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buf->tail += l; /* count full message w/ '\0' terminating char */
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} else {
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/* we need to break up the message and "circle" it around */
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char *c;
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int k = buf->tail + l - buf->size; /* count # of bytes we don't fit */
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/* We need to move HEAD! This is always the case since we are going
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* to "circle" the message.
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*/
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c = memchr(buf->data + k, '\0', buf->size - k);
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if (c != NULL) { /* if we don't have '\0'??? weird!!! */
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/* move head pointer */
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buf->head = c - buf->data + 1;
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/* now write the first part of the message */
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strncpy(buf->data + buf->tail, msg, l - k - 1);
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/* ALWAYS terminate end of buffer w/ '\0' */
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buf->data[buf->size - 1] = '\0';
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/* now write out the rest of the string to the beginning of the buffer */
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strcpy(buf->data, &msg[l - k - 1]);
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/* we need to place the TAIL at the end of the message */
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buf->tail = k + 1;
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} else {
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printf
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("Weird! Can't find the terminator token from the beginning??? \n");
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buf->head = buf->tail = 0; /* reset buffer, since it's probably corrupted */
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}
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}
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sem_up(s_semid);
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}
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#endif /* CONFIG_FEATURE_IPC_SYSLOG */
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/* Note: There is also a function called "message()" in init.c */
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/* Print a message to the log file. */
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static void message(char *fmt, ...) __attribute__ ((format(printf, 1, 2)));
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static void message(char *fmt, ...)
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{
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int fd;
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struct flock fl;
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va_list arguments;
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fl.l_whence = SEEK_SET;
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fl.l_start = 0;
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fl.l_len = 1;
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#ifdef CONFIG_FEATURE_IPC_SYSLOG
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if ((circular_logging == TRUE) && (buf != NULL)) {
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char b[1024];
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va_start(arguments, fmt);
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vsnprintf(b, sizeof(b) - 1, fmt, arguments);
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va_end(arguments);
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circ_message(b);
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} else
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#endif
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if ((fd = device_open(logFilePath,
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O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND |
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O_NONBLOCK)) >= 0) {
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fl.l_type = F_WRLCK;
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fcntl(fd, F_SETLKW, &fl);
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#ifdef CONFIG_FEATURE_ROTATE_LOGFILE
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if ( logFileSize > 0 ) {
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struct stat statf;
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int r = fstat(fd, &statf);
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if( !r && (statf.st_mode & S_IFREG)
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&& (lseek(fd,0,SEEK_END) > logFileSize) ) {
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if(logFileRotate > 0) {
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int i;
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char oldFile[(strlen(logFilePath)+4)], newFile[(strlen(logFilePath)+4)];
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for(i=logFileRotate-1;i>0;i--) {
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sprintf(oldFile, "%s.%d", logFilePath, i-1);
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sprintf(newFile, "%s.%d", logFilePath, i);
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rename(oldFile, newFile);
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}
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sprintf(newFile, "%s.%d", logFilePath, 0);
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fl.l_type = F_UNLCK;
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fcntl (fd, F_SETLKW, &fl);
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close(fd);
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rename(logFilePath, newFile);
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fd = device_open (logFilePath,
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O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND |
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O_NONBLOCK);
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fl.l_type = F_WRLCK;
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fcntl (fd, F_SETLKW, &fl);
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} else {
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ftruncate( fd, 0 );
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}
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}
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}
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#endif
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va_start(arguments, fmt);
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vdprintf(fd, fmt, arguments);
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va_end(arguments);
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fl.l_type = F_UNLCK;
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fcntl(fd, F_SETLKW, &fl);
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close(fd);
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} else {
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/* Always send console messages to /dev/console so people will see them. */
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if ((fd = device_open(_PATH_CONSOLE,
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O_WRONLY | O_NOCTTY | O_NONBLOCK)) >= 0) {
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va_start(arguments, fmt);
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vdprintf(fd, fmt, arguments);
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va_end(arguments);
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close(fd);
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} else {
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fprintf(stderr, "Bummer, can't print: ");
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va_start(arguments, fmt);
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vfprintf(stderr, fmt, arguments);
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fflush(stderr);
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va_end(arguments);
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}
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}
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}
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#ifdef CONFIG_FEATURE_REMOTE_LOG
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static void init_RemoteLog(void)
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{
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memset(&remoteaddr, 0, sizeof(remoteaddr));
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remotefd = socket(AF_INET, SOCK_DGRAM, 0);
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if (remotefd < 0) {
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bb_error_msg("cannot create socket");
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}
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remoteaddr.sin_family = AF_INET;
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remoteaddr.sin_addr = *(struct in_addr *) *(xgethostbyname(RemoteHost))->h_addr_list;
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remoteaddr.sin_port = htons(RemotePort);
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}
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#endif
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static void logMessage(int pri, char *msg)
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{
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time_t now;
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char *timestamp;
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static char res[20];
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#ifdef CONFIG_FEATURE_REMOTE_LOG
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static char line[MAXLINE + 1];
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#endif
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CODE *c_pri, *c_fac;
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if (pri != 0) {
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for (c_fac = facilitynames;
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c_fac->c_name && !(c_fac->c_val == LOG_FAC(pri) << 3); c_fac++);
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for (c_pri = prioritynames;
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c_pri->c_name && !(c_pri->c_val == LOG_PRI(pri)); c_pri++);
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if (c_fac->c_name == NULL || c_pri->c_name == NULL) {
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snprintf(res, sizeof(res), "<%d>", pri);
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} else {
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snprintf(res, sizeof(res), "%s.%s", c_fac->c_name, c_pri->c_name);
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}
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}
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if (strlen(msg) < 16 || msg[3] != ' ' || msg[6] != ' ' ||
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msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') {
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time(&now);
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timestamp = ctime(&now) + 4;
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timestamp[15] = '\0';
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} else {
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timestamp = msg;
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timestamp[15] = '\0';
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msg += 16;
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}
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/* todo: supress duplicates */
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#ifdef CONFIG_FEATURE_REMOTE_LOG
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if (doRemoteLog == TRUE) {
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/* trying connect the socket */
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if (-1 == remotefd) {
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init_RemoteLog();
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}
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/* if we have a valid socket, send the message */
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if (-1 != remotefd) {
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now = 1;
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snprintf(line, sizeof(line), "<%d>%s", pri, msg);
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retry:
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/* send message to remote logger */
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if(( -1 == sendto(remotefd, line, strlen(line), 0,
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(struct sockaddr *) &remoteaddr,
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sizeof(remoteaddr))) && (errno == EINTR)) {
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/* sleep now seconds and retry (with now * 2) */
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sleep(now);
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now *= 2;
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goto retry;
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}
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}
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}
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if (local_logging == TRUE)
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#endif
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{
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/* now spew out the message to wherever it is supposed to go */
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if (small)
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message("%s %s\n", timestamp, msg);
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else
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message("%s %s %s %s\n", timestamp, LocalHostName, res, msg);
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}
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}
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static void quit_signal(int sig)
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{
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logMessage(LOG_SYSLOG | LOG_INFO, "System log daemon exiting.");
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unlink(lfile);
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#ifdef CONFIG_FEATURE_IPC_SYSLOG
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ipcsyslog_cleanup();
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#endif
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exit(TRUE);
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}
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static void domark(int sig)
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{
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if (MarkInterval > 0) {
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logMessage(LOG_SYSLOG | LOG_INFO, "-- MARK --");
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alarm(MarkInterval);
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}
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}
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/* This must be a #define, since when CONFIG_DEBUG and BUFFERS_GO_IN_BSS are
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* enabled, we otherwise get a "storage size isn't constant error. */
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static int serveConnection(char *tmpbuf, int n_read)
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{
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char *p = tmpbuf;
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while (p < tmpbuf + n_read) {
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int pri = (LOG_USER | LOG_NOTICE);
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int num_lt = 0;
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char line[MAXLINE + 1];
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unsigned char c;
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char *q = line;
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while ((c = *p) && q < &line[sizeof(line) - 1]) {
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if (c == '<' && num_lt == 0) {
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/* Parse the magic priority number. */
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num_lt++;
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pri = 0;
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while (isdigit(*(++p))) {
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pri = 10 * pri + (*p - '0');
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}
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if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) {
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pri = (LOG_USER | LOG_NOTICE);
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}
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} else if (c == '\n') {
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*q++ = ' ';
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} else if (iscntrl(c) && (c < 0177)) {
|
|
*q++ = '^';
|
|
*q++ = c ^ 0100;
|
|
} else {
|
|
*q++ = c;
|
|
}
|
|
p++;
|
|
}
|
|
*q = '\0';
|
|
p++;
|
|
/* Now log it */
|
|
logMessage(pri, line);
|
|
}
|
|
return n_read;
|
|
}
|
|
|
|
static void doSyslogd(void) ATTRIBUTE_NORETURN;
|
|
static void doSyslogd(void)
|
|
{
|
|
struct sockaddr_un sunx;
|
|
socklen_t addrLength;
|
|
|
|
int sock_fd;
|
|
fd_set fds;
|
|
|
|
/* Set up signal handlers. */
|
|
signal(SIGINT, quit_signal);
|
|
signal(SIGTERM, quit_signal);
|
|
signal(SIGQUIT, quit_signal);
|
|
signal(SIGHUP, SIG_IGN);
|
|
signal(SIGCHLD, SIG_IGN);
|
|
#ifdef SIGCLD
|
|
signal(SIGCLD, SIG_IGN);
|
|
#endif
|
|
signal(SIGALRM, domark);
|
|
alarm(MarkInterval);
|
|
|
|
/* Create the syslog file so realpath() can work. */
|
|
if (realpath(_PATH_LOG, lfile) != NULL) {
|
|
unlink(lfile);
|
|
}
|
|
|
|
memset(&sunx, 0, sizeof(sunx));
|
|
sunx.sun_family = AF_UNIX;
|
|
strncpy(sunx.sun_path, lfile, sizeof(sunx.sun_path));
|
|
if ((sock_fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) {
|
|
bb_perror_msg_and_die("Couldn't get file descriptor for socket "
|
|
_PATH_LOG);
|
|
}
|
|
|
|
addrLength = sizeof(sunx.sun_family) + strlen(sunx.sun_path);
|
|
if (bind(sock_fd, (struct sockaddr *) &sunx, addrLength) < 0) {
|
|
bb_perror_msg_and_die("Could not connect to socket " _PATH_LOG);
|
|
}
|
|
|
|
if (chmod(lfile, 0666) < 0) {
|
|
bb_perror_msg_and_die("Could not set permission on " _PATH_LOG);
|
|
}
|
|
#ifdef CONFIG_FEATURE_IPC_SYSLOG
|
|
if (circular_logging == TRUE) {
|
|
ipcsyslog_init();
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_FEATURE_REMOTE_LOG
|
|
if (doRemoteLog == TRUE) {
|
|
init_RemoteLog();
|
|
}
|
|
#endif
|
|
|
|
logMessage(LOG_SYSLOG | LOG_INFO, "syslogd started: " "BusyBox v" BB_VER );
|
|
|
|
for (;;) {
|
|
|
|
FD_ZERO(&fds);
|
|
FD_SET(sock_fd, &fds);
|
|
|
|
if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) {
|
|
if (errno == EINTR) {
|
|
/* alarm may have happened. */
|
|
continue;
|
|
}
|
|
bb_perror_msg_and_die("select error");
|
|
}
|
|
|
|
if (FD_ISSET(sock_fd, &fds)) {
|
|
int i;
|
|
#if MAXLINE > BUFSIZ
|
|
# define TMP_BUF_SZ BUFSIZ
|
|
#else
|
|
# define TMP_BUF_SZ MAXLINE
|
|
#endif
|
|
#define tmpbuf bb_common_bufsiz1
|
|
|
|
if ((i = recv(sock_fd, tmpbuf, TMP_BUF_SZ, 0)) > 0) {
|
|
tmpbuf[i] = '\0';
|
|
serveConnection(tmpbuf, i);
|
|
} else {
|
|
bb_perror_msg_and_die("UNIX socket error");
|
|
}
|
|
} /* FD_ISSET() */
|
|
} /* for main loop */
|
|
}
|
|
|
|
int syslogd_main(int argc, char **argv)
|
|
{
|
|
int opt;
|
|
|
|
int doFork = TRUE;
|
|
|
|
char *p;
|
|
|
|
/* do normal option parsing */
|
|
while ((opt = getopt(argc, argv, "m:nO:s:Sb:R:LC::")) > 0) {
|
|
switch (opt) {
|
|
case 'm':
|
|
MarkInterval = atoi(optarg) * 60;
|
|
break;
|
|
case 'n':
|
|
doFork = FALSE;
|
|
break;
|
|
case 'O':
|
|
logFilePath = optarg;
|
|
break;
|
|
#ifdef CONFIG_FEATURE_ROTATE_LOGFILE
|
|
case 's':
|
|
logFileSize = atoi(optarg) * 1024;
|
|
break;
|
|
case 'b':
|
|
logFileRotate = atoi(optarg);
|
|
if( logFileRotate > 99 ) logFileRotate = 99;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_REMOTE_LOG
|
|
case 'R':
|
|
RemoteHost = bb_xstrdup(optarg);
|
|
if ((p = strchr(RemoteHost, ':'))) {
|
|
RemotePort = atoi(p + 1);
|
|
*p = '\0';
|
|
}
|
|
doRemoteLog = TRUE;
|
|
break;
|
|
case 'L':
|
|
local_logging = TRUE;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_FEATURE_IPC_SYSLOG
|
|
case 'C':
|
|
if (optarg) {
|
|
int buf_size = atoi(optarg);
|
|
if (buf_size >= 4) {
|
|
shm_size = buf_size * 1024;
|
|
}
|
|
}
|
|
circular_logging = TRUE;
|
|
break;
|
|
#endif
|
|
case 'S':
|
|
small = true;
|
|
break;
|
|
default:
|
|
bb_show_usage();
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_FEATURE_REMOTE_LOG
|
|
/* If they have not specified remote logging, then log locally */
|
|
if (doRemoteLog == FALSE)
|
|
local_logging = TRUE;
|
|
#endif
|
|
|
|
|
|
/* Store away localhost's name before the fork */
|
|
gethostname(LocalHostName, sizeof(LocalHostName));
|
|
if ((p = strchr(LocalHostName, '.'))) {
|
|
*p = '\0';
|
|
}
|
|
|
|
umask(0);
|
|
|
|
if (doFork == TRUE) {
|
|
#if defined(__uClinux__)
|
|
vfork_daemon_rexec(0, 1, argc, argv, "-n");
|
|
#else /* __uClinux__ */
|
|
if(daemon(0, 1) < 0)
|
|
bb_perror_msg_and_die("daemon");
|
|
#endif /* __uClinux__ */
|
|
}
|
|
doSyslogd();
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
Local Variables
|
|
c-file-style: "linux"
|
|
c-basic-offset: 4
|
|
tab-width: 4
|
|
End:
|
|
*/
|