| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini syslogd implementation for busybox |
| * |
| * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| * |
| * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org> |
| * |
| * "circular buffer" Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com> |
| * |
| * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001 |
| * |
| * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
| */ |
| |
| /* |
| * Done in syslogd_and_logger.c: |
| #include "libbb.h" |
| #define SYSLOG_NAMES |
| #define SYSLOG_NAMES_CONST |
| #include <syslog.h> |
| */ |
| |
| #include <paths.h> |
| #include <sys/un.h> |
| #include <sys/uio.h> |
| |
| #if ENABLE_FEATURE_REMOTE_LOG |
| #include <netinet/in.h> |
| #endif |
| |
| #if ENABLE_FEATURE_IPC_SYSLOG |
| #include <sys/ipc.h> |
| #include <sys/sem.h> |
| #include <sys/shm.h> |
| #endif |
| |
| |
| #define DEBUG 0 |
| |
| /* MARK code is not very useful, is bloat, and broken: |
| * can deadlock if alarmed to make MARK while writing to IPC buffer |
| * (semaphores are down but do_mark routine tries to down them again) */ |
| #undef SYSLOGD_MARK |
| |
| /* Write locking does not seem to be useful either */ |
| #undef SYSLOGD_WRLOCK |
| |
| enum { |
| MAX_READ = 256, |
| DNS_WAIT_SEC = 2 * 60, |
| }; |
| |
| /* Semaphore operation structures */ |
| struct shbuf_ds { |
| int32_t size; /* size of data - 1 */ |
| int32_t tail; /* end of message list */ |
| char data[1]; /* data/messages */ |
| }; |
| |
| /* Allows us to have smaller initializer. Ugly. */ |
| #define GLOBALS \ |
| const char *logFilePath; \ |
| int logFD; \ |
| /* interval between marks in seconds */ \ |
| /*int markInterval;*/ \ |
| /* level of messages to be logged */ \ |
| int logLevel; \ |
| IF_FEATURE_ROTATE_LOGFILE( \ |
| /* max size of file before rotation */ \ |
| unsigned logFileSize; \ |
| /* number of rotated message files */ \ |
| unsigned logFileRotate; \ |
| unsigned curFileSize; \ |
| smallint isRegular; \ |
| ) \ |
| IF_FEATURE_REMOTE_LOG( \ |
| /* udp socket for remote logging */ \ |
| int remoteFD; \ |
| len_and_sockaddr* remoteAddr; \ |
| ) \ |
| IF_FEATURE_IPC_SYSLOG( \ |
| int shmid; /* ipc shared memory id */ \ |
| int s_semid; /* ipc semaphore id */ \ |
| int shm_size; \ |
| struct sembuf SMwup[1]; \ |
| struct sembuf SMwdn[3]; \ |
| ) |
| |
| struct init_globals { |
| GLOBALS |
| }; |
| |
| struct globals { |
| GLOBALS |
| |
| #if ENABLE_FEATURE_REMOTE_LOG |
| unsigned last_dns_resolve; |
| char *remoteAddrStr; |
| #endif |
| |
| #if ENABLE_FEATURE_IPC_SYSLOG |
| struct shbuf_ds *shbuf; |
| #endif |
| time_t last_log_time; |
| /* localhost's name. We print only first 64 chars */ |
| char *hostname; |
| |
| /* We recv into recvbuf... */ |
| char recvbuf[MAX_READ * (1 + ENABLE_FEATURE_SYSLOGD_DUP)]; |
| /* ...then copy to parsebuf, escaping control chars */ |
| /* (can grow x2 max) */ |
| char parsebuf[MAX_READ*2]; |
| /* ...then sprintf into printbuf, adding timestamp (15 chars), |
| * host (64), fac.prio (20) to the message */ |
| /* (growth by: 15 + 64 + 20 + delims = ~110) */ |
| char printbuf[MAX_READ*2 + 128]; |
| }; |
| |
| static const struct init_globals init_data = { |
| .logFilePath = "/var/log/messages", |
| .logFD = -1, |
| #ifdef SYSLOGD_MARK |
| .markInterval = 20 * 60, |
| #endif |
| .logLevel = 8, |
| #if ENABLE_FEATURE_ROTATE_LOGFILE |
| .logFileSize = 200 * 1024, |
| .logFileRotate = 1, |
| #endif |
| #if ENABLE_FEATURE_REMOTE_LOG |
| .remoteFD = -1, |
| #endif |
| #if ENABLE_FEATURE_IPC_SYSLOG |
| .shmid = -1, |
| .s_semid = -1, |
| .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), // default shm size |
| .SMwup = { {1, -1, IPC_NOWAIT} }, |
| .SMwdn = { {0, 0}, {1, 0}, {1, +1} }, |
| #endif |
| }; |
| |
| #define G (*ptr_to_globals) |
| #define INIT_G() do { \ |
| SET_PTR_TO_GLOBALS(memcpy(xzalloc(sizeof(G)), &init_data, sizeof(init_data))); \ |
| } while (0) |
| |
| |
| /* Options */ |
| enum { |
| OPTBIT_mark = 0, // -m |
| OPTBIT_nofork, // -n |
| OPTBIT_outfile, // -O |
| OPTBIT_loglevel, // -l |
| OPTBIT_small, // -S |
| IF_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s |
| IF_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b |
| IF_FEATURE_REMOTE_LOG( OPTBIT_remotelog ,) // -R |
| IF_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L |
| IF_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C |
| IF_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D |
| |
| OPT_mark = 1 << OPTBIT_mark , |
| OPT_nofork = 1 << OPTBIT_nofork , |
| OPT_outfile = 1 << OPTBIT_outfile , |
| OPT_loglevel = 1 << OPTBIT_loglevel, |
| OPT_small = 1 << OPTBIT_small , |
| OPT_filesize = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0, |
| OPT_rotatecnt = IF_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0, |
| OPT_remotelog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_remotelog )) + 0, |
| OPT_locallog = IF_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0, |
| OPT_circularlog = IF_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0, |
| OPT_dup = IF_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 0, |
| }; |
| #define OPTION_STR "m:nO:l:S" \ |
| IF_FEATURE_ROTATE_LOGFILE("s:" ) \ |
| IF_FEATURE_ROTATE_LOGFILE("b:" ) \ |
| IF_FEATURE_REMOTE_LOG( "R:" ) \ |
| IF_FEATURE_REMOTE_LOG( "L" ) \ |
| IF_FEATURE_IPC_SYSLOG( "C::") \ |
| IF_FEATURE_SYSLOGD_DUP( "D" ) |
| #define OPTION_DECL *opt_m, *opt_l \ |
| IF_FEATURE_ROTATE_LOGFILE(,*opt_s) \ |
| IF_FEATURE_ROTATE_LOGFILE(,*opt_b) \ |
| IF_FEATURE_IPC_SYSLOG( ,*opt_C = NULL) |
| #define OPTION_PARAM &opt_m, &G.logFilePath, &opt_l \ |
| IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \ |
| IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \ |
| IF_FEATURE_REMOTE_LOG( ,&G.remoteAddrStr) \ |
| IF_FEATURE_IPC_SYSLOG( ,&opt_C) |
| |
| |
| /* circular buffer variables/structures */ |
| #if ENABLE_FEATURE_IPC_SYSLOG |
| |
| #if CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE < 4 |
| #error Sorry, you must set the syslogd buffer size to at least 4KB. |
| #error Please check CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE |
| #endif |
| |
| /* our shared key (syslogd.c and logread.c must be in sync) */ |
| enum { KEY_ID = 0x414e4547 }; /* "GENA" */ |
| |
| static void ipcsyslog_cleanup(void) |
| { |
| if (G.shmid != -1) { |
| shmdt(G.shbuf); |
| } |
| if (G.shmid != -1) { |
| shmctl(G.shmid, IPC_RMID, NULL); |
| } |
| if (G.s_semid != -1) { |
| semctl(G.s_semid, 0, IPC_RMID, 0); |
| } |
| } |
| |
| static void ipcsyslog_init(void) |
| { |
| if (DEBUG) |
| printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size); |
| |
| G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644); |
| if (G.shmid == -1) { |
| bb_perror_msg_and_die("shmget"); |
| } |
| |
| G.shbuf = shmat(G.shmid, NULL, 0); |
| if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */ |
| bb_perror_msg_and_die("shmat"); |
| } |
| |
| memset(G.shbuf, 0, G.shm_size); |
| G.shbuf->size = G.shm_size - offsetof(struct shbuf_ds, data) - 1; |
| /*G.shbuf->tail = 0;*/ |
| |
| // we'll trust the OS to set initial semval to 0 (let's hope) |
| G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023); |
| if (G.s_semid == -1) { |
| if (errno == EEXIST) { |
| G.s_semid = semget(KEY_ID, 2, 0); |
| if (G.s_semid != -1) |
| return; |
| } |
| bb_perror_msg_and_die("semget"); |
| } |
| } |
| |
| /* Write message to shared mem buffer */ |
| static void log_to_shmem(const char *msg, int len) |
| { |
| int old_tail, new_tail; |
| |
| if (semop(G.s_semid, G.SMwdn, 3) == -1) { |
| bb_perror_msg_and_die("SMwdn"); |
| } |
| |
| /* Circular Buffer Algorithm: |
| * -------------------------- |
| * tail == position where to store next syslog message. |
| * tail's max value is (shbuf->size - 1) |
| * Last byte of buffer is never used and remains NUL. |
| */ |
| len++; /* length with NUL included */ |
| again: |
| old_tail = G.shbuf->tail; |
| new_tail = old_tail + len; |
| if (new_tail < G.shbuf->size) { |
| /* store message, set new tail */ |
| memcpy(G.shbuf->data + old_tail, msg, len); |
| G.shbuf->tail = new_tail; |
| } else { |
| /* k == available buffer space ahead of old tail */ |
| int k = G.shbuf->size - old_tail; |
| /* copy what fits to the end of buffer, and repeat */ |
| memcpy(G.shbuf->data + old_tail, msg, k); |
| msg += k; |
| len -= k; |
| G.shbuf->tail = 0; |
| goto again; |
| } |
| if (semop(G.s_semid, G.SMwup, 1) == -1) { |
| bb_perror_msg_and_die("SMwup"); |
| } |
| if (DEBUG) |
| printf("tail:%d\n", G.shbuf->tail); |
| } |
| #else |
| void ipcsyslog_cleanup(void); |
| void ipcsyslog_init(void); |
| void log_to_shmem(const char *msg); |
| #endif /* FEATURE_IPC_SYSLOG */ |
| |
| |
| /* Print a message to the log file. */ |
| static void log_locally(time_t now, char *msg) |
| { |
| #ifdef SYSLOGD_WRLOCK |
| struct flock fl; |
| #endif |
| int len = strlen(msg); |
| |
| #if ENABLE_FEATURE_IPC_SYSLOG |
| if ((option_mask32 & OPT_circularlog) && G.shbuf) { |
| log_to_shmem(msg, len); |
| return; |
| } |
| #endif |
| if (G.logFD >= 0) { |
| /* Reopen log file every second. This allows admin |
| * to delete the file and not worry about restarting us. |
| * This costs almost nothing since it happens |
| * _at most_ once a second. |
| */ |
| if (!now) |
| now = time(NULL); |
| if (G.last_log_time != now) { |
| G.last_log_time = now; |
| close(G.logFD); |
| goto reopen; |
| } |
| } else { |
| reopen: |
| G.logFD = open(G.logFilePath, O_WRONLY | O_CREAT |
| | O_NOCTTY | O_APPEND | O_NONBLOCK, |
| 0666); |
| if (G.logFD < 0) { |
| /* cannot open logfile? - print to /dev/console then */ |
| int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK); |
| if (fd < 0) |
| fd = 2; /* then stderr, dammit */ |
| full_write(fd, msg, len); |
| if (fd != 2) |
| close(fd); |
| return; |
| } |
| #if ENABLE_FEATURE_ROTATE_LOGFILE |
| { |
| struct stat statf; |
| G.isRegular = (fstat(G.logFD, &statf) == 0 && S_ISREG(statf.st_mode)); |
| /* bug (mostly harmless): can wrap around if file > 4gb */ |
| G.curFileSize = statf.st_size; |
| } |
| #endif |
| } |
| |
| #ifdef SYSLOGD_WRLOCK |
| fl.l_whence = SEEK_SET; |
| fl.l_start = 0; |
| fl.l_len = 1; |
| fl.l_type = F_WRLCK; |
| fcntl(G.logFD, F_SETLKW, &fl); |
| #endif |
| |
| #if ENABLE_FEATURE_ROTATE_LOGFILE |
| if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) { |
| if (G.logFileRotate) { /* always 0..99 */ |
| int i = strlen(G.logFilePath) + 3 + 1; |
| char oldFile[i]; |
| char newFile[i]; |
| i = G.logFileRotate - 1; |
| /* rename: f.8 -> f.9; f.7 -> f.8; ... */ |
| while (1) { |
| sprintf(newFile, "%s.%d", G.logFilePath, i); |
| if (i == 0) break; |
| sprintf(oldFile, "%s.%d", G.logFilePath, --i); |
| /* ignore errors - file might be missing */ |
| rename(oldFile, newFile); |
| } |
| /* newFile == "f.0" now */ |
| rename(G.logFilePath, newFile); |
| #ifdef SYSLOGD_WRLOCK |
| fl.l_type = F_UNLCK; |
| fcntl(G.logFD, F_SETLKW, &fl); |
| #endif |
| close(G.logFD); |
| goto reopen; |
| } |
| ftruncate(G.logFD, 0); |
| } |
| G.curFileSize += |
| #endif |
| full_write(G.logFD, msg, len); |
| #ifdef SYSLOGD_WRLOCK |
| fl.l_type = F_UNLCK; |
| fcntl(G.logFD, F_SETLKW, &fl); |
| #endif |
| } |
| |
| static void parse_fac_prio_20(int pri, char *res20) |
| { |
| const CODE *c_pri, *c_fac; |
| |
| if (pri != 0) { |
| c_fac = facilitynames; |
| while (c_fac->c_name) { |
| if (c_fac->c_val != (LOG_FAC(pri) << 3)) { |
| c_fac++; |
| continue; |
| } |
| /* facility is found, look for prio */ |
| c_pri = prioritynames; |
| while (c_pri->c_name) { |
| if (c_pri->c_val != LOG_PRI(pri)) { |
| c_pri++; |
| continue; |
| } |
| snprintf(res20, 20, "%s.%s", |
| c_fac->c_name, c_pri->c_name); |
| return; |
| } |
| /* prio not found, bail out */ |
| break; |
| } |
| snprintf(res20, 20, "<%d>", pri); |
| } |
| } |
| |
| /* len parameter is used only for "is there a timestamp?" check. |
| * NB: some callers cheat and supply len==0 when they know |
| * that there is no timestamp, short-circuiting the test. */ |
| static void timestamp_and_log(int pri, char *msg, int len) |
| { |
| char *timestamp; |
| time_t now; |
| |
| /* Jan 18 00:11:22 msg... */ |
| /* 01234567890123456 */ |
| if (len < 16 || msg[3] != ' ' || msg[6] != ' ' |
| || msg[9] != ':' || msg[12] != ':' || msg[15] != ' ' |
| ) { |
| time(&now); |
| timestamp = ctime(&now) + 4; /* skip day of week */ |
| } else { |
| now = 0; |
| timestamp = msg; |
| msg += 16; |
| } |
| timestamp[15] = '\0'; |
| |
| if (option_mask32 & OPT_small) |
| sprintf(G.printbuf, "%s %s\n", timestamp, msg); |
| else { |
| char res[20]; |
| parse_fac_prio_20(pri, res); |
| sprintf(G.printbuf, "%s %.64s %s %s\n", timestamp, G.hostname, res, msg); |
| } |
| |
| /* Log message locally (to file or shared mem) */ |
| log_locally(now, G.printbuf); |
| } |
| |
| static void timestamp_and_log_internal(const char *msg) |
| { |
| /* -L, or no -R */ |
| if (ENABLE_FEATURE_REMOTE_LOG && !(option_mask32 & OPT_locallog)) |
| return; |
| timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)msg, 0); |
| } |
| |
| /* tmpbuf[len] is a NUL byte (set by caller), but there can be other, |
| * embedded NULs. Split messages on each of these NULs, parse prio, |
| * escape control chars and log each locally. */ |
| static void split_escape_and_log(char *tmpbuf, int len) |
| { |
| char *p = tmpbuf; |
| |
| tmpbuf += len; |
| while (p < tmpbuf) { |
| char c; |
| char *q = G.parsebuf; |
| int pri = (LOG_USER | LOG_NOTICE); |
| |
| if (*p == '<') { |
| /* Parse the magic priority number */ |
| pri = bb_strtou(p + 1, &p, 10); |
| if (*p == '>') |
| p++; |
| if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) |
| pri = (LOG_USER | LOG_NOTICE); |
| } |
| |
| while ((c = *p++)) { |
| if (c == '\n') |
| c = ' '; |
| if (!(c & ~0x1f) && c != '\t') { |
| *q++ = '^'; |
| c += '@'; /* ^@, ^A, ^B... */ |
| } |
| *q++ = c; |
| } |
| *q = '\0'; |
| |
| /* Now log it */ |
| if (LOG_PRI(pri) < G.logLevel) |
| timestamp_and_log(pri, G.parsebuf, q - G.parsebuf); |
| } |
| } |
| |
| #ifdef SYSLOGD_MARK |
| static void do_mark(int sig) |
| { |
| if (G.markInterval) { |
| timestamp_and_log_internal("-- MARK --"); |
| alarm(G.markInterval); |
| } |
| } |
| #endif |
| |
| /* Don't inline: prevent struct sockaddr_un to take up space on stack |
| * permanently */ |
| static NOINLINE int create_socket(void) |
| { |
| struct sockaddr_un sunx; |
| int sock_fd; |
| char *dev_log_name; |
| |
| memset(&sunx, 0, sizeof(sunx)); |
| sunx.sun_family = AF_UNIX; |
| |
| /* Unlink old /dev/log or object it points to. */ |
| /* (if it exists, bind will fail) */ |
| strcpy(sunx.sun_path, "/dev/log"); |
| dev_log_name = xmalloc_follow_symlinks("/dev/log"); |
| if (dev_log_name) { |
| safe_strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path)); |
| free(dev_log_name); |
| } |
| unlink(sunx.sun_path); |
| |
| sock_fd = xsocket(AF_UNIX, SOCK_DGRAM, 0); |
| xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx)); |
| chmod("/dev/log", 0666); |
| |
| return sock_fd; |
| } |
| |
| #if ENABLE_FEATURE_REMOTE_LOG |
| static int try_to_resolve_remote(void) |
| { |
| if (!G.remoteAddr) { |
| unsigned now = monotonic_sec(); |
| |
| /* Don't resolve name too often - DNS timeouts can be big */ |
| if ((now - G.last_dns_resolve) < DNS_WAIT_SEC) |
| return -1; |
| G.last_dns_resolve = now; |
| G.remoteAddr = host2sockaddr(G.remoteAddrStr, 514); |
| if (!G.remoteAddr) |
| return -1; |
| } |
| return socket(G.remoteAddr->u.sa.sa_family, SOCK_DGRAM, 0); |
| } |
| #endif |
| |
| static void do_syslogd(void) NORETURN; |
| static void do_syslogd(void) |
| { |
| int sock_fd; |
| #if ENABLE_FEATURE_SYSLOGD_DUP |
| int last_sz = -1; |
| char *last_buf; |
| char *recvbuf = G.recvbuf; |
| #else |
| #define recvbuf (G.recvbuf) |
| #endif |
| |
| /* Set up signal handlers (so that they interrupt read()) */ |
| signal_no_SA_RESTART_empty_mask(SIGTERM, record_signo); |
| signal_no_SA_RESTART_empty_mask(SIGINT, record_signo); |
| //signal_no_SA_RESTART_empty_mask(SIGQUIT, record_signo); |
| signal(SIGHUP, SIG_IGN); |
| #ifdef SYSLOGD_MARK |
| signal(SIGALRM, do_mark); |
| alarm(G.markInterval); |
| #endif |
| sock_fd = create_socket(); |
| |
| if (ENABLE_FEATURE_IPC_SYSLOG && (option_mask32 & OPT_circularlog)) { |
| ipcsyslog_init(); |
| } |
| |
| timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER); |
| |
| while (!bb_got_signal) { |
| ssize_t sz; |
| |
| #if ENABLE_FEATURE_SYSLOGD_DUP |
| last_buf = recvbuf; |
| if (recvbuf == G.recvbuf) |
| recvbuf = G.recvbuf + MAX_READ; |
| else |
| recvbuf = G.recvbuf; |
| #endif |
| read_again: |
| sz = read(sock_fd, recvbuf, MAX_READ - 1); |
| if (sz < 0) { |
| if (!bb_got_signal) |
| bb_perror_msg("read from /dev/log"); |
| break; |
| } |
| |
| /* Drop trailing '\n' and NULs (typically there is one NUL) */ |
| while (1) { |
| if (sz == 0) |
| goto read_again; |
| /* man 3 syslog says: "A trailing newline is added when needed". |
| * However, neither glibc nor uclibc do this: |
| * syslog(prio, "test") sends "test\0" to /dev/log, |
| * syslog(prio, "test\n") sends "test\n\0". |
| * IOW: newline is passed verbatim! |
| * I take it to mean that it's syslogd's job |
| * to make those look identical in the log files. */ |
| if (recvbuf[sz-1] != '\0' && recvbuf[sz-1] != '\n') |
| break; |
| sz--; |
| } |
| #if ENABLE_FEATURE_SYSLOGD_DUP |
| if ((option_mask32 & OPT_dup) && (sz == last_sz)) |
| if (memcmp(last_buf, recvbuf, sz) == 0) |
| continue; |
| last_sz = sz; |
| #endif |
| #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 (G.remoteAddrStr) { |
| if (-1 == G.remoteFD) { |
| G.remoteFD = try_to_resolve_remote(); |
| if (-1 == G.remoteFD) |
| goto no_luck; |
| } |
| /* Stock syslogd sends it '\n'-terminated |
| * over network, mimic that */ |
| recvbuf[sz] = '\n'; |
| /* send message to remote logger, ignore possible error */ |
| /* TODO: on some errors, close and set G.remoteFD to -1 |
| * so that DNS resolution and connect is retried? */ |
| sendto(G.remoteFD, recvbuf, sz+1, MSG_DONTWAIT, |
| &G.remoteAddr->u.sa, G.remoteAddr->len); |
| no_luck: ; |
| } |
| #endif |
| if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) { |
| recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */ |
| split_escape_and_log(recvbuf, sz); |
| } |
| } /* while (!bb_got_signal) */ |
| |
| timestamp_and_log_internal("syslogd exiting"); |
| puts("syslogd exiting"); |
| if (ENABLE_FEATURE_IPC_SYSLOG) |
| ipcsyslog_cleanup(); |
| kill_myself_with_sig(bb_got_signal); |
| #undef recvbuf |
| } |
| |
| int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int syslogd_main(int argc UNUSED_PARAM, char **argv) |
| { |
| char OPTION_DECL; |
| int opts; |
| |
| INIT_G(); |
| #if ENABLE_FEATURE_REMOTE_LOG |
| G.last_dns_resolve = monotonic_sec() - DNS_WAIT_SEC - 1; |
| #endif |
| |
| /* do normal option parsing */ |
| opt_complementary = "=0"; /* no non-option params */ |
| opts = getopt32(argv, OPTION_STR, OPTION_PARAM); |
| #ifdef SYSLOGD_MARK |
| if (opts & OPT_mark) // -m |
| G.markInterval = xatou_range(opt_m, 0, INT_MAX/60) * 60; |
| #endif |
| //if (opts & OPT_nofork) // -n |
| //if (opts & OPT_outfile) // -O |
| if (opts & OPT_loglevel) // -l |
| G.logLevel = xatou_range(opt_l, 1, 8); |
| //if (opts & OPT_small) // -S |
| #if ENABLE_FEATURE_ROTATE_LOGFILE |
| if (opts & OPT_filesize) // -s |
| G.logFileSize = xatou_range(opt_s, 0, INT_MAX/1024) * 1024; |
| if (opts & OPT_rotatecnt) // -b |
| G.logFileRotate = xatou_range(opt_b, 0, 99); |
| #endif |
| #if ENABLE_FEATURE_IPC_SYSLOG |
| if (opt_C) // -Cn |
| G.shm_size = xatoul_range(opt_C, 4, INT_MAX/1024) * 1024; |
| #endif |
| |
| /* If they have not specified remote logging, then log locally */ |
| if (ENABLE_FEATURE_REMOTE_LOG && !(opts & OPT_remotelog)) // -R |
| option_mask32 |= OPT_locallog; |
| |
| /* Store away localhost's name before the fork */ |
| G.hostname = safe_gethostname(); |
| *strchrnul(G.hostname, '.') = '\0'; |
| |
| if (!(opts & OPT_nofork)) { |
| bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv); |
| } |
| umask(0); |
| write_pidfile("/var/run/syslogd.pid"); |
| do_syslogd(); |
| /* return EXIT_SUCCESS; */ |
| } |
| |
| /* Clean up. Needed because we are included from syslogd_and_logger.c */ |
| #undef DEBUG |
| #undef SYSLOGD_MARK |
| #undef SYSLOGD_WRLOCK |
| #undef G |
| #undef GLOBALS |
| #undef INIT_G |
| #undef OPTION_STR |
| #undef OPTION_DECL |
| #undef OPTION_PARAM |