X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=sysklogd%2Fsyslogd.c;h=38ea3d7ff2e4177907cc94b0c8b2dca0d167468e;hb=a09a42cd83a0365b5b52dfdcce20b3c9932be801;hp=86bfdc5df6a7d807127fb5f7f2352f6fd8c37ef5;hpb=06af2165288cd6516b89001ec9e24992619230e0;p=oweals%2Fbusybox.git diff --git a/sysklogd/syslogd.c b/sysklogd/syslogd.c index 86bfdc5df..38ea3d7ff 100644 --- a/sysklogd/syslogd.c +++ b/sysklogd/syslogd.c @@ -13,63 +13,134 @@ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. */ -#include "busybox.h" +/* + * Done in syslogd_and_logger.c: +#include "libbb.h" +#define SYSLOG_NAMES +#define SYSLOG_NAMES_CONST +#include +*/ + #include #include - -/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */ -#define SYSLOG_NAMES -#include #include +#if ENABLE_FEATURE_REMOTE_LOG +#include +#endif + +#if ENABLE_FEATURE_IPC_SYSLOG +#include +#include +#include +#endif + + #define DEBUG 0 -/* Path to the unix socket */ -static const char *dev_log_name; +/* 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 -/* Path for the file where all log messages are written */ -static const char *logFilePath = "/var/log/messages"; -static int logFD = -1; +enum { + MAX_READ = 256, + DNS_WAIT_SEC = 2 * 60, +}; -/* interval between marks in seconds */ -static int markInterval = 20 * 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 */ +}; -/* level of messages to be locally logged */ -static int logLevel = 8; +/* 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; \ +USE_FEATURE_ROTATE_LOGFILE( \ + /* max size of file before rotation */ \ + unsigned logFileSize; \ + /* number of rotated message files */ \ + unsigned logFileRotate; \ + unsigned curFileSize; \ + smallint isRegular; \ +) \ +USE_FEATURE_REMOTE_LOG( \ + /* udp socket for remote logging */ \ + int remoteFD; \ + len_and_sockaddr* remoteAddr; \ +) \ +USE_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 +}; -/* localhost's name */ -static char localHostName[64]; +struct globals { + GLOBALS -#if ENABLE_FEATURE_ROTATE_LOGFILE -/* max size of message file before being rotated */ -static unsigned logFileSize = 200 * 1024; -/* number of rotated message files */ -static unsigned logFileRotate = 1; -static unsigned curFileSize; -static smallint isRegular; +#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 -#include -/* udp socket for logging to remote host */ -static int remoteFD = -1; -static len_and_sockaddr* remoteAddr; + .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 +}; -/* We are using bb_common_bufsiz1 for buffering: */ -enum { MAX_READ = (BUFSIZ/6) & ~0xf }; -/* We recv into RECVBUF... (size: MAX_READ ~== BUFSIZ/6) */ -#define RECVBUF bb_common_bufsiz1 -/* ...then copy to PARSEBUF, escaping control chars */ -/* (can grow x2 max ~== BUFSIZ/3) */ -#define PARSEBUF (bb_common_bufsiz1 + MAX_READ) -/* ...then sprintf into PRINTBUF, adding timestamp (15 chars), - * host (64), fac.prio (20) to the message */ -/* (growth by: 15 + 64 + 20 + delims = ~110) */ -#define PRINTBUF (bb_common_bufsiz1 + 3*MAX_READ) -/* totals: BUFSIZ == BUFSIZ/6 + BUFSIZ/3 + (BUFSIZ/3+BUFSIZ/6) - * -- we have BUFSIZ/6 extra at the ent of PRINTBUF - * which covers needed ~110 extra bytes (and much more) */ +#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 */ @@ -82,8 +153,9 @@ enum { USE_FEATURE_ROTATE_LOGFILE(OPTBIT_filesize ,) // -s USE_FEATURE_ROTATE_LOGFILE(OPTBIT_rotatecnt ,) // -b USE_FEATURE_REMOTE_LOG( OPTBIT_remote ,) // -R - USE_FEATURE_REMOTE_LOG( OPTBIT_localtoo ,) // -L + USE_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L USE_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C + USE_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D OPT_mark = 1 << OPTBIT_mark , OPT_nofork = 1 << OPTBIT_nofork , @@ -93,92 +165,77 @@ enum { OPT_filesize = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_filesize )) + 0, OPT_rotatecnt = USE_FEATURE_ROTATE_LOGFILE((1 << OPTBIT_rotatecnt )) + 0, OPT_remotelog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_remote )) + 0, - OPT_locallog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_localtoo )) + 0, + OPT_locallog = USE_FEATURE_REMOTE_LOG( (1 << OPTBIT_locallog )) + 0, OPT_circularlog = USE_FEATURE_IPC_SYSLOG( (1 << OPTBIT_circularlog)) + 0, + OPT_dup = USE_FEATURE_SYSLOGD_DUP( (1 << OPTBIT_dup )) + 0, }; #define OPTION_STR "m:nO:l:S" \ USE_FEATURE_ROTATE_LOGFILE("s:" ) \ USE_FEATURE_ROTATE_LOGFILE("b:" ) \ USE_FEATURE_REMOTE_LOG( "R:" ) \ USE_FEATURE_REMOTE_LOG( "L" ) \ - USE_FEATURE_IPC_SYSLOG( "C::") + USE_FEATURE_IPC_SYSLOG( "C::") \ + USE_FEATURE_SYSLOGD_DUP( "D" ) #define OPTION_DECL *opt_m, *opt_l \ USE_FEATURE_ROTATE_LOGFILE(,*opt_s) \ USE_FEATURE_ROTATE_LOGFILE(,*opt_b) \ - USE_FEATURE_REMOTE_LOG( ,*opt_R) \ USE_FEATURE_IPC_SYSLOG( ,*opt_C = NULL) -#define OPTION_PARAM &opt_m, &logFilePath, &opt_l \ +#define OPTION_PARAM &opt_m, &G.logFilePath, &opt_l \ USE_FEATURE_ROTATE_LOGFILE(,&opt_s) \ USE_FEATURE_ROTATE_LOGFILE(,&opt_b) \ - USE_FEATURE_REMOTE_LOG( ,&opt_R) \ + USE_FEATURE_REMOTE_LOG( ,&G.remoteAddrStr) \ USE_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 -#include -#include -#include - -/* our shared key */ -#define KEY_ID ((long)0x414e4547) /* "GENA" */ - -// Semaphore operation structures -static struct shbuf_ds { - int32_t size; // size of data written - int32_t head; // start of message list - int32_t tail; // end of message list - char data[1]; // data/messages -} *shbuf; // shared memory pointer - -static int shmid = -1; // ipc shared memory id -static int s_semid = -1; // ipc semaphore id -static int shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024); // default shm size +/* our shared key (syslogd.c and logread.c must be in sync) */ +enum { KEY_ID = 0x414e4547 }; /* "GENA" */ static void ipcsyslog_cleanup(void) { - if (shmid != -1) { - shmdt(shbuf); + if (G.shmid != -1) { + shmdt(G.shbuf); } - if (shmid != -1) { - shmctl(shmid, IPC_RMID, NULL); + if (G.shmid != -1) { + shmctl(G.shmid, IPC_RMID, NULL); } - if (s_semid != -1) { - semctl(s_semid, 0, IPC_RMID, 0); + if (G.s_semid != -1) { + semctl(G.s_semid, 0, IPC_RMID, 0); } } static void ipcsyslog_init(void) { if (DEBUG) - printf("shmget(%lx, %d,...)\n", KEY_ID, shm_size); + printf("shmget(%x, %d,...)\n", (int)KEY_ID, G.shm_size); - shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023); - if (shmid == -1) { + G.shmid = shmget(KEY_ID, G.shm_size, IPC_CREAT | 0644); + if (G.shmid == -1) { bb_perror_msg_and_die("shmget"); } - shbuf = shmat(shmid, NULL, 0); - if (!shbuf) { + G.shbuf = shmat(G.shmid, NULL, 0); + if (G.shbuf == (void*) -1L) { /* shmat has bizarre error return */ bb_perror_msg_and_die("shmat"); } - shbuf->size = shm_size - offsetof(struct shbuf_ds, data); - shbuf->head = shbuf->tail = 0; + 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) - s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023); - if (s_semid == -1) { + G.s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023); + if (G.s_semid == -1) { if (errno == EEXIST) { - s_semid = semget(KEY_ID, 2, 0); - if (s_semid != -1) + G.s_semid = semget(KEY_ID, 2, 0); + if (G.s_semid != -1) return; } bb_perror_msg_and_die("semget"); @@ -188,75 +245,41 @@ static void ipcsyslog_init(void) /* Write message to shared mem buffer */ static void log_to_shmem(const char *msg, int len) { - /* Why libc insists on these being rw? */ - static struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} }; - static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} }; - int old_tail, new_tail; - char *c; - if (semop(s_semid, SMwdn, 3) == -1) { + 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. - * head == position of next message to retrieve ("print"). - * if head == tail, there is no "unprinted" messages left. - * head is typically advanced by separate "reader" program, - * but if there isn't one, we have to do it ourself. - * messages are NUL-separated. + * 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 = shbuf->tail; + old_tail = G.shbuf->tail; new_tail = old_tail + len; - if (new_tail < shbuf->size) { - /* No need to move head if shbuf->head <= old_tail, - * else... */ - if (old_tail < shbuf->head && shbuf->head <= new_tail) { - /* ...need to move head forward */ - c = memchr(shbuf->data + new_tail, '\0', - shbuf->size - new_tail); - if (!c) /* no NUL ahead of us, wrap around */ - c = memchr(shbuf->data, '\0', old_tail); - if (!c) { /* still nothing? point to this msg... */ - shbuf->head = old_tail; - } else { - /* convert pointer to offset + skip NUL */ - shbuf->head = c - shbuf->data + 1; - } - } + if (new_tail < G.shbuf->size) { /* store message, set new tail */ - memcpy(shbuf->data + old_tail, msg, len); - shbuf->tail = new_tail; + memcpy(G.shbuf->data + old_tail, msg, len); + G.shbuf->tail = new_tail; } else { - /* we need to break up the message and wrap it around */ /* k == available buffer space ahead of old tail */ - int k = shbuf->size - old_tail - 1; - if (shbuf->head > old_tail) { - /* we are going to overwrite head, need to - * move it out of the way */ - c = memchr(shbuf->data, '\0', old_tail); - if (!c) { /* nothing? point to this msg... */ - shbuf->head = old_tail; - } else { /* convert pointer to offset + skip NUL */ - shbuf->head = c - shbuf->data + 1; - } - } + int k = G.shbuf->size - old_tail; /* copy what fits to the end of buffer, and repeat */ - memcpy(shbuf->data + old_tail, msg, k); + memcpy(G.shbuf->data + old_tail, msg, k); msg += k; len -= k; - shbuf->tail = 0; + G.shbuf->tail = 0; goto again; } - if (semop(s_semid, SMwup, 1) == -1) { + if (semop(G.s_semid, G.SMwup, 1) == -1) { bb_perror_msg_and_die("SMwup"); } if (DEBUG) - printf("head:%d tail:%d\n", shbuf->head, shbuf->tail); + printf("tail:%d\n", G.shbuf->tail); } #else void ipcsyslog_cleanup(void); @@ -266,33 +289,32 @@ void log_to_shmem(const char *msg); /* Print a message to the log file. */ -static void log_locally(char *msg) +static void log_locally(time_t now, char *msg) { - static time_t last; struct flock fl; int len = strlen(msg); #if ENABLE_FEATURE_IPC_SYSLOG - if ((option_mask32 & OPT_circularlog) && shbuf) { + if ((option_mask32 & OPT_circularlog) && G.shbuf) { log_to_shmem(msg, len); return; } #endif - if (logFD >= 0) { - time_t cur; - time(&cur); - if (last != cur) { - last = cur; /* reopen log file every second */ - close(logFD); + if (G.logFD >= 0) { + if (!now) + now = time(NULL); + if (G.last_log_time != now) { + G.last_log_time = now; /* reopen log file every second */ + close(G.logFD); goto reopen; } } else { reopen: - logFD = device_open(logFilePath, O_WRONLY | O_CREAT + G.logFD = device_open(G.logFilePath, O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND | O_NONBLOCK); - if (logFD < 0) { + if (G.logFD < 0) { /* cannot open logfile? - print to /dev/console then */ - int fd = device_open(_PATH_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK); + 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); @@ -302,11 +324,10 @@ static void log_locally(char *msg) } #if ENABLE_FEATURE_ROTATE_LOGFILE { - struct stat statf; - - isRegular = (fstat(logFD, &statf) == 0 && (statf.st_mode & S_IFREG)); - /* bug (mostly harmless): can wrap around if file > 4gb */ - curFileSize = statf.st_size; + 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 } @@ -315,53 +336,56 @@ static void log_locally(char *msg) fl.l_start = 0; fl.l_len = 1; fl.l_type = F_WRLCK; - fcntl(logFD, F_SETLKW, &fl); + fcntl(G.logFD, F_SETLKW, &fl); #if ENABLE_FEATURE_ROTATE_LOGFILE - if (logFileSize && isRegular && curFileSize > logFileSize) { - if (logFileRotate) { /* always 0..99 */ - int i = strlen(logFilePath) + 3 + 1; + 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 = logFileRotate - 1; + i = G.logFileRotate - 1; /* rename: f.8 -> f.9; f.7 -> f.8; ... */ while (1) { - sprintf(newFile, "%s.%d", logFilePath, i); + sprintf(newFile, "%s.%d", G.logFilePath, i); if (i == 0) break; - sprintf(oldFile, "%s.%d", logFilePath, --i); + sprintf(oldFile, "%s.%d", G.logFilePath, --i); + /* ignore errors - file might be missing */ rename(oldFile, newFile); } /* newFile == "f.0" now */ - rename(logFilePath, newFile); + rename(G.logFilePath, newFile); fl.l_type = F_UNLCK; - fcntl(logFD, F_SETLKW, &fl); - close(logFD); + fcntl(G.logFD, F_SETLKW, &fl); + close(G.logFD); goto reopen; } - ftruncate(logFD, 0); + ftruncate(G.logFD, 0); } - curFileSize += + G.curFileSize += #endif - full_write(logFD, msg, len); + full_write(G.logFD, msg, len); fl.l_type = F_UNLCK; - fcntl(logFD, F_SETLKW, &fl); + fcntl(G.logFD, F_SETLKW, &fl); } static void parse_fac_prio_20(int pri, char *res20) { - CODE *c_pri, *c_fac; + 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; + 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; + c_pri++; + continue; } snprintf(res20, 20, "%s.%s", c_fac->c_name, c_pri->c_name); @@ -375,39 +399,47 @@ static void parse_fac_prio_20(int pri, char *res20) } /* len parameter is used only for "is there a timestamp?" check. - * NB: some callers cheat and supply 0 when they know - * that there is no timestamp, short-cutting the test. */ + * 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; if (len < 16 || msg[3] != ' ' || msg[6] != ' ' || msg[9] != ':' || msg[12] != ':' || msg[15] != ' ' ) { - time_t now; time(&now); - timestamp = ctime(&now) + 4; + timestamp = ctime(&now) + 4; /* skip day of week */ } else { + now = 0; timestamp = msg; msg += 16; } timestamp[15] = '\0'; - /* Log message locally (to file or shared mem) */ - if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) { - if (LOG_PRI(pri) < logLevel) { - if (option_mask32 & OPT_small) - sprintf(PRINTBUF, "%s %s\n", timestamp, msg); - else { - char res[20]; - parse_fac_prio_20(pri, res); - sprintf(PRINTBUF, "%s %s %s %s\n", timestamp, localHostName, res, msg); - } - log_locally(PRINTBUF); - } + 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) +{ + 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; @@ -415,164 +447,227 @@ static void split_escape_and_log(char *tmpbuf, int len) tmpbuf += len; while (p < tmpbuf) { char c; - char *q = PARSEBUF; + 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)) { + if (*p == '>') + p++; + if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) pri = (LOG_USER | LOG_NOTICE); - } } while ((c = *p++)) { if (c == '\n') c = ' '; - if (!(c & ~0x1f)) { + if (!(c & ~0x1f) && c != '\t') { *q++ = '^'; c += '@'; /* ^@, ^A, ^B... */ } *q++ = c; } *q = '\0'; + /* Now log it */ - timestamp_and_log(pri, PARSEBUF, q - PARSEBUF); + if (LOG_PRI(pri) < G.logLevel) + timestamp_and_log(pri, G.parsebuf, q - G.parsebuf); } } static void quit_signal(int sig) { - timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"syslogd exiting", 0); + timestamp_and_log_internal("syslogd exiting"); puts("syslogd exiting"); - unlink(dev_log_name); if (ENABLE_FEATURE_IPC_SYSLOG) ipcsyslog_cleanup(); - exit(1); + kill_myself_with_sig(sig); } +#ifdef SYSLOGD_MARK static void do_mark(int sig) { - if (markInterval) { - timestamp_and_log(LOG_SYSLOG | LOG_INFO, (char*)"-- MARK --", 0); - alarm(markInterval); + if (G.markInterval) { + timestamp_and_log_internal("-- MARK --"); + alarm(G.markInterval); } } +#endif -static void do_syslogd(void) ATTRIBUTE_NORETURN; -static void do_syslogd(void) +/* Don't inline: prevent struct sockaddr_un to take up space on stack + * permanently */ +static NOINLINE int create_socket(void) { struct sockaddr_un sunx; - socklen_t addr_len; int sock_fd; - fd_set fds; - - /* Set up signal handlers */ - signal(SIGINT, quit_signal); - signal(SIGTERM, quit_signal); - signal(SIGQUIT, quit_signal); - signal(SIGHUP, SIG_IGN); - signal(SIGCHLD, SIG_IGN); -#ifdef SIGCLD - signal(SIGCLD, SIG_IGN); -#endif - signal(SIGALRM, do_mark); - alarm(markInterval); - - dev_log_name = xmalloc_realpath(_PATH_LOG); - if (!dev_log_name) - dev_log_name = _PATH_LOG; - - /* Unlink old /dev/log (or object it points to) */ - unlink(dev_log_name); + char *dev_log_name; memset(&sunx, 0, sizeof(sunx)); sunx.sun_family = AF_UNIX; - strncpy(sunx.sun_path, dev_log_name, sizeof(sunx.sun_path)); + + /* 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); - addr_len = sizeof(sunx.sun_family) + strlen(sunx.sun_path); - xbind(sock_fd, (struct sockaddr *) &sunx, addr_len); + xbind(sock_fd, (struct sockaddr *) &sunx, sizeof(sunx)); + chmod("/dev/log", 0666); + + return sock_fd; +} - if (chmod(dev_log_name, 0666) < 0) { - bb_perror_msg_and_die("cannot set permission on %s", dev_log_name); +#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 */ + bb_signals(0 + + (1 << SIGINT) + + (1 << SIGTERM) + + (1 << SIGQUIT) + , quit_signal); + signal(SIGHUP, SIG_IGN); + /* signal(SIGCHLD, SIG_IGN); - why? */ +#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(LOG_SYSLOG | LOG_INFO, - (char*)"syslogd started: BusyBox v" BB_VER, 0); + timestamp_and_log_internal("syslogd started: BusyBox v" BB_VER); for (;;) { - FD_ZERO(&fds); - FD_SET(sock_fd, &fds); - - if (select(sock_fd + 1, &fds, NULL, NULL, NULL) < 0) { - if (errno == EINTR) { - /* alarm may have happened */ - continue; - } - bb_perror_msg_and_die("select"); + 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 = safe_read(sock_fd, recvbuf, MAX_READ - 1); + if (sz < 0) + bb_perror_msg_and_die("read from /dev/log"); + + /* 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 (FD_ISSET(sock_fd, &fds)) { - int i; - i = recv(sock_fd, RECVBUF, MAX_READ - 1, 0); - if (i <= 0) - bb_perror_msg_and_die("UNIX socket error"); - /* TODO: maybe suppress duplicates? */ +#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 (remoteAddr) { - if (-1 == remoteFD) { - remoteFD = socket(remoteAddr->sa.sa_family, SOCK_DGRAM, 0); - } - if (-1 != remoteFD) { - /* send message to remote logger, ignore possible error */ - sendto(remoteFD, RECVBUF, i, MSG_DONTWAIT, - &remoteAddr->sa, remoteAddr->len); - } + /* 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 - RECVBUF[i] = '\0'; - split_escape_and_log(RECVBUF, i); - } /* FD_ISSET() */ - } /* for */ + if (!ENABLE_FEATURE_REMOTE_LOG || (option_mask32 & OPT_locallog)) { + recvbuf[sz] = '\0'; /* ensure it *is* NUL terminated */ + split_escape_and_log(recvbuf, sz); + } + } /* for (;;) */ +#undef recvbuf } -int syslogd_main(int argc, char **argv); -int syslogd_main(int argc, char **argv) +int syslogd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int syslogd_main(int argc UNUSED_PARAM, char **argv) { char OPTION_DECL; - char *p; + + 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 */ - getopt32(argc, argv, OPTION_STR, OPTION_PARAM); + getopt32(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); -#endif -#if ENABLE_FEATURE_REMOTE_LOG - if (option_mask32 & OPT_remotelog) { // -R - remoteAddr = host2sockaddr(opt_R, 514); - } - //if (option_mask32 & OPT_locallog) // -L + G.logFileRotate = xatou_range(opt_b, 0, 99); #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 */ @@ -580,20 +675,22 @@ 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, '.'); - if (p) { - *p = '\0'; - } + G.hostname = safe_gethostname(); + *strchrnul(G.hostname, '.') = '\0'; if (!(option_mask32 & OPT_nofork)) { -#ifdef BB_NOMMU - vfork_daemon_rexec(0, 1, argc, argv, "-n"); -#else - bb_daemonize(); -#endif + 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 G +#undef GLOBALS +#undef INIT_G +#undef OPTION_STR +#undef OPTION_DECL +#undef OPTION_PARAM