mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-05 18:36:37 +00:00
6ba1a80c26
Patch by Larry Doolittle <ldoolitt@recycle.lbl.gov>.
646 lines
17 KiB
C
646 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) 1999,2000,2001 by Lineo, inc.
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* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.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@cachier.com>
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*
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* Maintainer: Gennady Feldman <gena01@cachier.com> as of Mar 12, 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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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 <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 <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[BUFSIZ] = "";
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static char *logFilePath = __LOG_FILE;
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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[32];
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#ifdef BB_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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/* 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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/* circular buffer variables/structures */
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#ifdef BB_FEATURE_IPC_SYSLOG
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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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int data_size = 16000; // data size
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int shm_size = 16000 + sizeof(*buf); // our buffer 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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perror_msg_and_die("semop[SMwup]");
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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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perror_msg_and_die("semop[SMwdn]");
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}
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void ipcsyslog_cleanup(void){
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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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if (shmid != -1)
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shmctl(shmid, IPC_RMID, NULL);
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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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void ipcsyslog_init(void){
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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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perror_msg_and_die("shmget");
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if ((buf = shmat(shmid, NULL, 0)) == NULL)
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perror_msg_and_die("shmat");
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buf->size=data_size;
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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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perror_msg_and_die("semget");
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}else
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perror_msg_and_die("semget");
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} else {
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sem_up(s_semid);
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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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void circ_message(const char *msg){
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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=memchr(buf->data+buf->head + k,'\0',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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} /* 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("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
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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 BB_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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vsprintf (b, 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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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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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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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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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 BB_FEATURE_REMOTE_LOG
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/* send message to remote logger */
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if ( -1 != remotefd){
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static const int IOV_COUNT = 2;
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struct iovec iov[IOV_COUNT];
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struct iovec *v = iov;
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bzero(&res, sizeof(res));
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snprintf(res, sizeof(res), "<%d>", pri);
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v->iov_base = res ;
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v->iov_len = strlen(res);
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v++;
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v->iov_base = msg;
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v->iov_len = strlen(msg);
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if ( -1 == writev(remotefd,iov, IOV_COUNT)){
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error_msg_and_die("syslogd: cannot write to remote file handle on"
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"%s:%d",RemoteHost,RemotePort);
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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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/* now spew out the message to wherever it is supposed to go */
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message("%s %s %s %s\n", timestamp, LocalHostName, res, msg);
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}
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static void quit_signal(int sig)
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{
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logMessage(0, "System log daemon exiting.");
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unlink(lfile);
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#ifdef BB_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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static const int BUFSIZE = 1023;
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static int serveConnection (int conn)
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{
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RESERVE_BB_BUFFER(tmpbuf, BUFSIZE + 1);
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int n_read;
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n_read = read (conn, tmpbuf, BUFSIZE );
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if (n_read > 0) {
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int pri = (LOG_USER | LOG_NOTICE);
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char line[ BUFSIZE + 1 ];
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unsigned char c;
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char *p = tmpbuf, *q = line;
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tmpbuf[ n_read - 1 ] = '\0';
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while (p && (c = *p) && q < &line[ sizeof (line) - 1 ]) {
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if (c == '<') {
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/* Parse the magic priority number. */
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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)) {
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*q++ = '^';
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*q++ = c ^ 0100;
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} else {
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*q++ = c;
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}
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p++;
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}
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*q = '\0';
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/* Now log it */
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logMessage (pri, line);
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}
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return n_read;
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}
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#ifdef BB_FEATURE_REMOTE_LOG
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static void init_RemoteLog (void){
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struct sockaddr_in remoteaddr;
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struct hostent *hostinfo;
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int len = sizeof(remoteaddr);
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bzero(&remoteaddr, len);
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remotefd = socket(AF_INET, SOCK_DGRAM, 0);
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if (remotefd < 0) {
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error_msg_and_die("syslogd: cannot create socket");
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}
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hostinfo = (struct hostent *) gethostbyname(RemoteHost);
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if (!hostinfo) {
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error_msg_and_die("syslogd: cannot resolve remote host name [%s]", RemoteHost);
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}
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remoteaddr.sin_family = AF_INET;
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remoteaddr.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
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remoteaddr.sin_port = htons(RemotePort);
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/*
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Since we are using UDP sockets, connect just sets the default host and port
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for future operations
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*/
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if ( 0 != (connect(remotefd, (struct sockaddr *) &remoteaddr, len))){
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error_msg_and_die("syslogd: cannot connect to remote host %s:%d", RemoteHost, RemotePort);
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}
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}
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#endif
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static void doSyslogd (void) __attribute__ ((noreturn));
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static void doSyslogd (void)
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{
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struct sockaddr_un sunx;
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socklen_t addrLength;
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int sock_fd;
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fd_set fds;
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/* Set up signal handlers. */
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signal (SIGINT, quit_signal);
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signal (SIGTERM, quit_signal);
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signal (SIGQUIT, quit_signal);
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signal (SIGHUP, SIG_IGN);
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signal (SIGCHLD, SIG_IGN);
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#ifdef SIGCLD
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signal (SIGCLD, SIG_IGN);
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#endif
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signal (SIGALRM, domark);
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alarm (MarkInterval);
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/* Create the syslog file so realpath() can work. */
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close (open (_PATH_LOG, O_RDWR | O_CREAT, 0644));
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if (realpath (_PATH_LOG, lfile) == NULL)
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perror_msg_and_die ("Could not resolve path to " _PATH_LOG);
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unlink (lfile);
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|
|
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_STREAM, 0)) < 0)
|
|
perror_msg_and_die ("Couldn't obtain descriptor for socket " _PATH_LOG);
|
|
|
|
addrLength = sizeof (sunx.sun_family) + strlen (sunx.sun_path);
|
|
if ((bind (sock_fd, (struct sockaddr *) &sunx, addrLength)) || (listen (sock_fd, 5)))
|
|
perror_msg_and_die ("Could not connect to socket " _PATH_LOG);
|
|
|
|
if (chmod (lfile, 0666) < 0)
|
|
perror_msg_and_die ("Could not set permission on " _PATH_LOG);
|
|
|
|
FD_ZERO (&fds);
|
|
FD_SET (sock_fd, &fds);
|
|
|
|
#ifdef BB_FEATURE_IPC_SYSLOG
|
|
if (circular_logging == TRUE ){
|
|
ipcsyslog_init();
|
|
}
|
|
#endif
|
|
|
|
#ifdef BB_FEATURE_REMOTE_LOG
|
|
if (doRemoteLog == TRUE){
|
|
init_RemoteLog();
|
|
}
|
|
#endif
|
|
|
|
logMessage (0, "syslogd started: " BB_BANNER);
|
|
|
|
for (;;) {
|
|
|
|
fd_set readfds;
|
|
int n_ready;
|
|
int fd;
|
|
|
|
memcpy (&readfds, &fds, sizeof (fds));
|
|
|
|
if ((n_ready = select (FD_SETSIZE, &readfds, NULL, NULL, NULL)) < 0) {
|
|
if (errno == EINTR) continue; /* alarm may have happened. */
|
|
perror_msg_and_die ("select error");
|
|
}
|
|
|
|
for (fd = 0; (n_ready > 0) && (fd < FD_SETSIZE); fd++) {
|
|
if (FD_ISSET (fd, &readfds)) {
|
|
|
|
--n_ready;
|
|
|
|
if (fd == sock_fd) {
|
|
int conn;
|
|
|
|
//printf("New Connection request.\n");
|
|
if ((conn = accept (sock_fd, (struct sockaddr *) &sunx, &addrLength)) < 0) {
|
|
perror_msg_and_die ("accept error");
|
|
}
|
|
|
|
FD_SET(conn, &fds);
|
|
//printf("conn: %i, set_size: %i\n",conn,FD_SETSIZE);
|
|
} else {
|
|
//printf("Serving connection: %i\n",fd);
|
|
if ( serveConnection(fd) <= 0 ) {
|
|
close (fd);
|
|
FD_CLR(fd, &fds);
|
|
}
|
|
} /* fd == sock_fd */
|
|
}/* FD_ISSET() */
|
|
}/* for */
|
|
} /* for main loop */
|
|
}
|
|
|
|
extern 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:R:LC")) > 0) {
|
|
switch (opt) {
|
|
case 'm':
|
|
MarkInterval = atoi(optarg) * 60;
|
|
break;
|
|
case 'n':
|
|
doFork = FALSE;
|
|
break;
|
|
case 'O':
|
|
logFilePath = strdup(optarg);
|
|
break;
|
|
#ifdef BB_FEATURE_REMOTE_LOG
|
|
case 'R':
|
|
RemoteHost = strdup(optarg);
|
|
if ( (p = strchr(RemoteHost, ':'))){
|
|
RemotePort = atoi(p+1);
|
|
*p = '\0';
|
|
}
|
|
doRemoteLog = TRUE;
|
|
break;
|
|
case 'L':
|
|
local_logging = TRUE;
|
|
break;
|
|
#endif
|
|
#ifdef BB_FEATURE_IPC_SYSLOG
|
|
case 'C':
|
|
circular_logging = TRUE;
|
|
break;
|
|
#endif
|
|
default:
|
|
show_usage();
|
|
}
|
|
}
|
|
|
|
#ifdef BB_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 (daemon(0, 1) < 0)
|
|
perror_msg_and_die("daemon");
|
|
}
|
|
doSyslogd();
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
Local Variables
|
|
c-file-style: "linux"
|
|
c-basic-offset: 4
|
|
tab-width: 4
|
|
End:
|
|
*/
|