syslogd: reduce data/bss usage. Code size is practically the same.
This commit is contained in:
Denis Vlasenko
parent
bff32ce4d5
commit
5e892bae51
@ -17,47 +17,107 @@
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#include <paths.h>
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#include <sys/un.h>
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/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */
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/* SYSLOG_NAMES defined to pull some extra junk from syslog.h: */
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/* prioritynames[] and facilitynames[]. uclibc pulls those in _rwdata_! :( */
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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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#define DEBUG 0
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/* Path for the file where all log messages are written */
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static const char *logFilePath = "/var/log/messages";
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static int logFD = -1;
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/* This is not very useful, is bloat, and broken:
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* can deadlock if alarmed to make MARK while writing to IPC buffer
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* (semaphores are down but do_mark routine tries to down them again) */
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#ifdef SYSLOGD_MARK
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/* interval between marks in seconds */
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static int markInterval = 20 * 60;
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#if ENABLE_FEATURE_REMOTE_LOG
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#include <netinet/in.h>
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#endif
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/* level of messages to be locally logged */
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static int logLevel = 8;
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#if ENABLE_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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#endif
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/* localhost's name */
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static char localHostName[64];
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#define DEBUG 0
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// Semaphore operation structures
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struct shbuf_ds {
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int32_t size; // size of data written
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int32_t head; // start of message list
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int32_t tail; // end of message list
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char data[1]; // data/messages
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}; // shared memory pointer
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struct globals {
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const char *logFilePath;
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int logFD;
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/* This is not very useful, is bloat, and broken:
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* can deadlock if alarmed to make MARK while writing to IPC buffer
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* (semaphores are down but do_mark routine tries to down them again) */
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#ifdef SYSLOGD_MARK
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/* interval between marks in seconds */
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int markInterval;
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#endif
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/* level of messages to be locally logged */
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int logLevel;
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#if ENABLE_FEATURE_ROTATE_LOGFILE
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/* max size of message file before being rotated */
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static unsigned logFileSize = 200 * 1024;
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/* number of rotated message files */
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static unsigned logFileRotate = 1;
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static unsigned curFileSize;
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static smallint isRegular;
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/* max size of message file before being rotated */
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unsigned logFileSize;
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/* number of rotated message files */
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unsigned logFileRotate;
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unsigned curFileSize;
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smallint isRegular;
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#endif
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#if ENABLE_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 len_and_sockaddr* remoteAddr;
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/* udp socket for logging to remote host */
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int remoteFD;
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len_and_sockaddr* remoteAddr;
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#endif
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#if ENABLE_FEATURE_IPC_SYSLOG
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int shmid; // ipc shared memory id
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int s_semid; // ipc semaphore id
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int shm_size;
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struct sembuf SMwup[1];
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struct sembuf SMwdn[3];
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struct shbuf_ds *shbuf;
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#endif
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time_t last_log_time;
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/* localhost's name */
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char localHostName[64];
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}; /* struct globals */
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static const struct globals init_globals = {
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.logFilePath = "/var/log/messages",
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.logFD = -1,
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#ifdef SYSLOGD_MARK
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.markInterval = 20 * 60,
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#endif
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.logLevel = 8,
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#if ENABLE_FEATURE_ROTATE_LOGFILE
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.logFileSize = 200 * 1024,
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.logFileRotate = 1,
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#endif
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#if ENABLE_FEATURE_REMOTE_LOG
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.remoteFD = -1,
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#endif
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#if ENABLE_FEATURE_IPC_SYSLOG
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.shmid = -1,
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.s_semid = -1,
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.shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), // default shm size
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.SMwup = { {1, -1, IPC_NOWAIT} },
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.SMwdn = { {0, 0}, {1, 0}, {1, +1} },
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#endif
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// FIXME: hidden tail with lotsa zeroes is here....
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};
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#define G (*ptr_to_globals)
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/* We are using bb_common_bufsiz1 for buffering: */
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enum { MAX_READ = (BUFSIZ/6) & ~0xf };
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/* We recv into RECVBUF... (size: MAX_READ ~== BUFSIZ/6) */
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@ -109,7 +169,7 @@ enum {
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USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \
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USE_FEATURE_REMOTE_LOG( ,*opt_R) \
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USE_FEATURE_IPC_SYSLOG( ,*opt_C = NULL)
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#define OPTION_PARAM &opt_m, &logFilePath, &opt_l \
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#define OPTION_PARAM &opt_m, &G.logFilePath, &opt_l \
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USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \
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USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \
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USE_FEATURE_REMOTE_LOG( ,&opt_R) \
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@ -119,68 +179,51 @@ enum {
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/* circular buffer variables/structures */
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#if ENABLE_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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#define KEY_ID ((long)0x414e4547) /* "GENA" */
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// Semaphore operation structures
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static struct shbuf_ds {
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int32_t size; // size of data written
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int32_t head; // start of message list
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int32_t tail; // end of message list
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char data[1]; // data/messages
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} *shbuf; // shared memory pointer
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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 void ipcsyslog_cleanup(void)
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{
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if (shmid != -1) {
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shmdt(shbuf);
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if (G.shmid != -1) {
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shmdt(G.shbuf);
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}
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if (shmid != -1) {
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shmctl(shmid, IPC_RMID, NULL);
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if (G.shmid != -1) {
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shmctl(G.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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if (G.s_semid != -1) {
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semctl(G.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 (DEBUG)
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printf("shmget(%lx, %d,...)\n", KEY_ID, shm_size);
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printf("shmget(%lx, %d,...)\n", KEY_ID, G.shm_size);
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shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023);
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if (shmid == -1) {
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G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 1023);
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if (G.shmid == -1) {
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bb_perror_msg_and_die("shmget");
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}
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shbuf = shmat(shmid, NULL, 0);
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if (!shbuf) {
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G.shbuf = shmat(G.shmid, NULL, 0);
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if (!G.shbuf) {
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bb_perror_msg_and_die("shmat");
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}
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shbuf->size = shm_size - offsetof(struct shbuf_ds, data);
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shbuf->head = shbuf->tail = 0;
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G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data);
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G.shbuf->head = G.shbuf->tail = 0;
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// we'll trust the OS to set initial semval to 0 (let's hope)
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s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
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if (s_semid == -1) {
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G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023);
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if (G.s_semid == -1) {
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if (errno == EEXIST) {
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s_semid = semget(KEY_ID, 2, 0);
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if (s_semid != -1)
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G.s_semid = semget(KEY_ID, 2, 0);
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if (G.s_semid != -1)
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return;
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}
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bb_perror_msg_and_die("semget");
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@ -190,14 +233,10 @@ static void ipcsyslog_init(void)
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/* Write message to shared mem buffer */
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static void log_to_shmem(const char *msg, int len)
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{
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/* Why libc insists on these being rw? */
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static struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} };
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static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} };
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int old_tail, new_tail;
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char *c;
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if (semop(s_semid, SMwdn, 3) == -1) {
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if (semop(G.s_semid, G.SMwdn, 3) == -1) {
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bb_perror_msg_and_die("SMwdn");
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}
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@ -212,53 +251,53 @@ static void log_to_shmem(const char *msg, int len)
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*/
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len++; /* length with NUL included */
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again:
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old_tail = shbuf->tail;
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old_tail = G.shbuf->tail;
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new_tail = old_tail + len;
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if (new_tail < shbuf->size) {
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if (new_tail < G.shbuf->size) {
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/* No need to move head if shbuf->head <= old_tail,
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* else... */
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if (old_tail < shbuf->head && shbuf->head <= new_tail) {
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if (old_tail < G.shbuf->head && G.shbuf->head <= new_tail) {
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/* ...need to move head forward */
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c = memchr(shbuf->data + new_tail, '\0',
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shbuf->size - new_tail);
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c = memchr(G.shbuf->data + new_tail, '\0',
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G.shbuf->size - new_tail);
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if (!c) /* no NUL ahead of us, wrap around */
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c = memchr(shbuf->data, '\0', old_tail);
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c = memchr(G.shbuf->data, '\0', old_tail);
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if (!c) { /* still nothing? point to this msg... */
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shbuf->head = old_tail;
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G.shbuf->head = old_tail;
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} else {
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/* convert pointer to offset + skip NUL */
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shbuf->head = c - shbuf->data + 1;
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G.shbuf->head = c - G.shbuf->data + 1;
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}
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}
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/* store message, set new tail */
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memcpy(shbuf->data + old_tail, msg, len);
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shbuf->tail = new_tail;
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memcpy(G.shbuf->data + old_tail, msg, len);
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G.shbuf->tail = new_tail;
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} else {
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/* we need to break up the message and wrap it around */
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/* k == available buffer space ahead of old tail */
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int k = shbuf->size - old_tail - 1;
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if (shbuf->head > old_tail) {
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int k = G.shbuf->size - old_tail - 1;
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if (G.shbuf->head > old_tail) {
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/* we are going to overwrite head, need to
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* move it out of the way */
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c = memchr(shbuf->data, '\0', old_tail);
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c = memchr(G.shbuf->data, '\0', old_tail);
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if (!c) { /* nothing? point to this msg... */
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shbuf->head = old_tail;
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G.shbuf->head = old_tail;
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} else { /* convert pointer to offset + skip NUL */
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shbuf->head = c - shbuf->data + 1;
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G.shbuf->head = c - G.shbuf->data + 1;
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}
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}
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/* copy what fits to the end of buffer, and repeat */
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memcpy(shbuf->data + old_tail, msg, k);
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memcpy(G.shbuf->data + old_tail, msg, k);
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msg += k;
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len -= k;
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shbuf->tail = 0;
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G.shbuf->tail = 0;
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goto again;
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}
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if (semop(s_semid, SMwup, 1) == -1) {
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if (semop(G.s_semid, G.SMwup, 1) == -1) {
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bb_perror_msg_and_die("SMwup");
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}
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if (DEBUG)
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printf("head:%d tail:%d\n", shbuf->head, shbuf->tail);
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printf("head:%d tail:%d\n", G.shbuf->head, G.shbuf->tail);
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}
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#else
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void ipcsyslog_cleanup(void);
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@ -270,29 +309,28 @@ void log_to_shmem(const char *msg);
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/* Print a message to the log file. */
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static void log_locally(char *msg)
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{
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static time_t last;
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struct flock fl;
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int len = strlen(msg);
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#if ENABLE_FEATURE_IPC_SYSLOG
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if ((option_mask32 & OPT_circularlog) && shbuf) {
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if ((option_mask32 & OPT_circularlog) && G.shbuf) {
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log_to_shmem(msg, len);
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return;
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}
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#endif
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if (logFD >= 0) {
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if (G.logFD >= 0) {
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time_t cur;
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time(&cur);
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if (last != cur) {
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last = cur; /* reopen log file every second */
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close(logFD);
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if (G.last_log_time != cur) {
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G.last_log_time = cur; /* reopen log file every second */
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close(G.logFD);
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goto reopen;
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}
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} else {
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reopen:
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logFD = device_open(logFilePath, O_WRONLY | O_CREAT
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G.logFD = device_open(G.logFilePath, O_WRONLY | O_CREAT
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| O_NOCTTY | O_APPEND | O_NONBLOCK);
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if (logFD < 0) {
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if (G.logFD < 0) {
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/* cannot open logfile? - print to /dev/console then */
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int fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK);
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if (fd < 0)
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@ -306,9 +344,9 @@ static void log_locally(char *msg)
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{
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struct stat statf;
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isRegular = (fstat(logFD, &statf) == 0 && (statf.st_mode & S_IFREG));
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G.isRegular = (fstat(G.logFD, &statf) == 0 && (statf.st_mode & S_IFREG));
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/* bug (mostly harmless): can wrap around if file > 4gb */
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curFileSize = statf.st_size;
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G.curFileSize = statf.st_size;
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}
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#endif
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}
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@ -317,36 +355,36 @@ static void log_locally(char *msg)
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fl.l_start = 0;
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fl.l_len = 1;
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fl.l_type = F_WRLCK;
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fcntl(logFD, F_SETLKW, &fl);
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fcntl(G.logFD, F_SETLKW, &fl);
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#if ENABLE_FEATURE_ROTATE_LOGFILE
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if (logFileSize && isRegular && curFileSize > logFileSize) {
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if (logFileRotate) { /* always 0..99 */
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int i = strlen(logFilePath) + 3 + 1;
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if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) {
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if (G.logFileRotate) { /* always 0..99 */
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int i = strlen(G.logFilePath) + 3 + 1;
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char oldFile[i];
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char newFile[i];
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i = logFileRotate - 1;
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i = G.logFileRotate - 1;
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/* rename: f.8 -> f.9; f.7 -> f.8; ... */
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while (1) {
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sprintf(newFile, "%s.%d", logFilePath, i);
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sprintf(newFile, "%s.%d", G.logFilePath, i);
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if (i == 0) break;
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sprintf(oldFile, "%s.%d", logFilePath, --i);
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sprintf(oldFile, "%s.%d", G.logFilePath, --i);
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rename(oldFile, newFile);
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}
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/* newFile == "f.0" now */
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rename(logFilePath, newFile);
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rename(G.logFilePath, newFile);
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fl.l_type = F_UNLCK;
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fcntl(logFD, F_SETLKW, &fl);
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close(logFD);
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fcntl(G.logFD, F_SETLKW, &fl);
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close(G.logFD);
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goto reopen;
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}
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ftruncate(logFD, 0);
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ftruncate(G.logFD, 0);
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}
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curFileSize +=
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G.curFileSize +=
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#endif
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full_write(logFD, msg, len);
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full_write(G.logFD, msg, len);
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fl.l_type = F_UNLCK;
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fcntl(logFD, F_SETLKW, &fl);
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fcntl(G.logFD, F_SETLKW, &fl);
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}
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static void parse_fac_prio_20(int pri, char *res20)
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@ -397,13 +435,13 @@ static void timestamp_and_log(int pri, char *msg, int len)
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/* Log message locally (to file or shared mem) */
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if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) {
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if (LOG_PRI(pri) < logLevel) {
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if (LOG_PRI(pri) < G.logLevel) {
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if (option_mask32 & OPT_small)
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sprintf(PRINTBUF, "%s %s\n", timestamp, msg);
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else {
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char res[20];
|
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parse_fac_prio_20(pri, res);
|
||||
sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, localHostName, res, msg);
|
||||
sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, G.localHostName, res, msg);
|
||||
}
|
||||
log_locally(PRINTBUF);
|
||||
}
|
||||
@ -456,9 +494,9 @@ static void quit_signal(int sig)
|
||||
#ifdef SYSLOGD_MARK
|
||||
static void do_mark(int sig)
|
||||
{
|
||||
if (markInterval) {
|
||||
if (G.markInterval) {
|
||||
timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"-- MARK --", 0);
|
||||
alarm(markInterval);
|
||||
alarm(G.markInterval);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
@ -482,7 +520,7 @@ static void do_syslogd(void)
|
||||
#endif
|
||||
#ifdef SYSLOGD_MARK
|
||||
signal(SIGALRM, do_mark);
|
||||
alarm(markInterval);
|
||||
alarm(G.markInterval);
|
||||
#endif
|
||||
|
||||
memset(&sunx, 0, sizeof(sunx));
|
||||
@ -541,14 +579,14 @@ static void do_syslogd(void)
|
||||
#if ENABLE_FEATURE_REMOTE_LOG
|
||||
/* We are not modifying log messages in any way before send */
|
||||
/* Remote site cannot trust _us_ anyway and need to do validation again */
|
||||
if (remoteAddr) {
|
||||
if (-1 == remoteFD) {
|
||||
remoteFD = socket(remoteAddr->sa.sa_family, SOCK_DGRAM, 0);
|
||||
if (G.remoteAddr) {
|
||||
if (-1 == G.remoteFD) {
|
||||
G.remoteFD = socket(G.remoteAddr->sa.sa_family, SOCK_DGRAM, 0);
|
||||
}
|
||||
if (-1 != remoteFD) {
|
||||
if (-1 != G.remoteFD) {
|
||||
/* send message to remote logger, ignore possible error */
|
||||
sendto(remoteFD, RECVBUF, i, MSG_DONTWAIT,
|
||||
&remoteAddr->sa, remoteAddr->len);
|
||||
sendto(G.remoteFD, RECVBUF, i, MSG_DONTWAIT,
|
||||
&G.remoteAddr->sa, G.remoteAddr->len);
|
||||
}
|
||||
}
|
||||
#endif
|
||||
@ -564,33 +602,36 @@ int syslogd_main(int argc, char **argv)
|
||||
char OPTION_DECL;
|
||||
char *p;
|
||||
|
||||
PTR_TO_GLOBALS = xzalloc(sizeof(G));
|
||||
memcpy(ptr_to_globals, &init_globals, sizeof(init_globals));
|
||||
|
||||
/* do normal option parsing */
|
||||
opt_complementary = "=0"; /* no non-option params */
|
||||
getopt32(argc, argv, OPTION_STR, OPTION_PARAM);
|
||||
#ifdef SYSLOGD_MARK
|
||||
if (option_mask32 & OPT_mark) // -m
|
||||
markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
|
||||
G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60;
|
||||
#endif
|
||||
//if (option_mask32 & OPT_nofork) // -n
|
||||
//if (option_mask32 & OPT_outfile) // -O
|
||||
if (option_mask32 & OPT_loglevel) // -l
|
||||
logLevel = xatou_range(opt_l, 1, 8);
|
||||
G.logLevel = xatou_range(opt_l, 1, 8);
|
||||
//if (option_mask32 & OPT_small) // -S
|
||||
#if ENABLE_FEATURE_ROTATE_LOGFILE
|
||||
if (option_mask32 & OPT_filesize) // -s
|
||||
logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
|
||||
G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024;
|
||||
if (option_mask32 & OPT_rotatecnt) // -b
|
||||
logFileRotate = xatou_range(opt_b, 0, 99);
|
||||
G.logFileRotate = xatou_range(opt_b, 0, 99);
|
||||
#endif
|
||||
#if ENABLE_FEATURE_REMOTE_LOG
|
||||
if (option_mask32 & OPT_remotelog) { // -R
|
||||
remoteAddr = xhost2sockaddr(opt_R, 514);
|
||||
G.remoteAddr = xhost2sockaddr(opt_R, 514);
|
||||
}
|
||||
//if (option_mask32 & OPT_locallog) // -L
|
||||
#endif
|
||||
#if ENABLE_FEATURE_IPC_SYSLOG
|
||||
if (opt_C) // -Cn
|
||||
shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
|
||||
G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024;
|
||||
#endif
|
||||
|
||||
/* If they have not specified remote logging, then log locally */
|
||||
@ -598,8 +639,8 @@ int syslogd_main(int argc, char **argv)
|
||||
option_mask32 |= OPT_locallog;
|
||||
|
||||
/* Store away localhost's name before the fork */
|
||||
gethostname(localHostName, sizeof(localHostName));
|
||||
p = strchr(localHostName, '.');
|
||||
gethostname(G.localHostName, sizeof(G.localHostName));
|
||||
p = strchr(G.localHostName, '.');
|
||||
if (p) {
|
||||
*p = '\0';
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user