diff options
Diffstat (limited to 'sysklogd')
| -rw-r--r-- | sysklogd/Config.src | 7 | ||||
| -rw-r--r-- | sysklogd/syslogd.c | 333 |
2 files changed, 275 insertions, 65 deletions
diff --git a/sysklogd/Config.src b/sysklogd/Config.src index d62dc5f..b3e13d7 100644 --- a/sysklogd/Config.src +++ b/sysklogd/Config.src @@ -52,6 +52,13 @@ config FEATURE_SYSLOGD_DUP Option -D instructs syslogd to drop consecutive messages which are totally the same. +config FEATURE_SYSLOGD_CFG + bool "Support syslog.conf" + default y + depends on SYSLOGD + help + Supports restricted syslogd config. + config FEATURE_SYSLOGD_READ_BUFFER_SIZE int "Read buffer size in bytes" default 256 diff --git a/sysklogd/syslogd.c b/sysklogd/syslogd.c index 24cab3b..f179dc5 100644 --- a/sysklogd/syslogd.c +++ b/sysklogd/syslogd.c @@ -66,10 +66,26 @@ typedef struct { } remoteHost_t; #endif +typedef struct logFile_t { + const char *path; + int fd; +#if ENABLE_FEATURE_ROTATE_LOGFILE + unsigned size; + uint8_t isRegular; +#endif +} logFile_t; + +#if ENABLE_FEATURE_SYSLOGD_CFG +typedef struct logRule_t { + uint8_t enabled_facility_priomap[LOG_NFACILITIES]; + struct logFile_t *file; + struct logRule_t *next; +} logRule_t; +#endif + /* Allows us to have smaller initializer. Ugly. */ #define GLOBALS \ - const char *logFilePath; \ - int logFD; \ + logFile_t logFile; \ /* interval between marks in seconds */ \ /*int markInterval;*/ \ /* level of messages to be logged */ \ @@ -79,8 +95,6 @@ IF_FEATURE_ROTATE_LOGFILE( \ unsigned logFileSize; \ /* number of rotated message files */ \ unsigned logFileRotate; \ - unsigned curFileSize; \ - smallint isRegular; \ ) \ IF_FEATURE_IPC_SYSLOG( \ int shmid; /* ipc shared memory id */ \ @@ -88,6 +102,9 @@ IF_FEATURE_IPC_SYSLOG( \ int shm_size; \ struct sembuf SMwup[1]; \ struct sembuf SMwdn[3]; \ +) \ +IF_FEATURE_SYSLOGD_CFG( \ + logRule_t *log_rules; \ ) struct init_globals { @@ -119,8 +136,10 @@ struct globals { }; static const struct init_globals init_data = { - .logFilePath = "/var/log/messages", - .logFD = -1, + .logFile = { + .path = "/var/log/messages", + .fd = -1, + }, #ifdef SYSLOGD_MARK .markInterval = 20 * 60, #endif @@ -132,7 +151,7 @@ static const struct init_globals init_data = { #if ENABLE_FEATURE_IPC_SYSLOG .shmid = -1, .s_semid = -1, - .shm_size = ((CONFIG_FEATURE_IPC_SYSLOG_BUFFER_SIZE)*1024), // default shm size + .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 @@ -157,6 +176,7 @@ enum { IF_FEATURE_REMOTE_LOG( OPTBIT_locallog ,) // -L IF_FEATURE_IPC_SYSLOG( OPTBIT_circularlog,) // -C IF_FEATURE_SYSLOGD_DUP( OPTBIT_dup ,) // -D + IF_FEATURE_SYSLOGD_CFG( OPTBIT_cfg ,) // -f OPT_mark = 1 << OPTBIT_mark , OPT_nofork = 1 << OPTBIT_nofork , @@ -169,6 +189,7 @@ enum { 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, + OPT_cfg = IF_FEATURE_SYSLOGD_CFG( (1 << OPTBIT_cfg )) + 0, }; #define OPTION_STR "m:nO:l:S" \ IF_FEATURE_ROTATE_LOGFILE("s:" ) \ @@ -176,18 +197,194 @@ enum { IF_FEATURE_REMOTE_LOG( "R:" ) \ IF_FEATURE_REMOTE_LOG( "L" ) \ IF_FEATURE_IPC_SYSLOG( "C::") \ - IF_FEATURE_SYSLOGD_DUP( "D" ) + IF_FEATURE_SYSLOGD_DUP( "D" ) \ + IF_FEATURE_SYSLOGD_CFG( "f:" ) #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_IPC_SYSLOG( ,*opt_C = NULL) \ + IF_FEATURE_SYSLOGD_CFG( ,*opt_f = NULL) +#define OPTION_PARAM &opt_m, &(G.logFile.path), &opt_l \ IF_FEATURE_ROTATE_LOGFILE(,&opt_s) \ IF_FEATURE_ROTATE_LOGFILE(,&opt_b) \ IF_FEATURE_REMOTE_LOG( ,&remoteAddrList) \ - IF_FEATURE_IPC_SYSLOG( ,&opt_C) + IF_FEATURE_IPC_SYSLOG( ,&opt_C) \ + IF_FEATURE_SYSLOGD_CFG( ,&opt_f) +#if ENABLE_FEATURE_SYSLOGD_CFG +static const CODE* find_by_name(char *name, const CODE* c_set) +{ + for (; c_set->c_name; c_set++) { + if (strcmp(name, c_set->c_name) == 0) + return c_set; + } + return NULL; +} +#endif +static const CODE* find_by_val(int val, const CODE* c_set) +{ + for (; c_set->c_name; c_set++) { + if (c_set->c_val == val) + return c_set; + } + return NULL; +} + +#if ENABLE_FEATURE_SYSLOGD_CFG +static void parse_syslogdcfg(const char *file) +{ + char *t; + logRule_t **pp_rule; + /* tok[0] set of selectors */ + /* tok[1] file name */ + /* tok[2] has to be NULL */ + char *tok[3]; + parser_t *parser; + + parser = config_open2(file ? file : "/etc/syslog.conf", + file ? xfopen_for_read : fopen_or_warn_stdin); + if (!parser) + /* didn't find default /etc/syslog.conf */ + /* proceed as if we built busybox without config support */ + return; + + /* use ptr to ptr to avoid checking whether head was initialized */ + pp_rule = &G.log_rules; + /* iterate through lines of config, skipping comments */ + while (config_read(parser, tok, 3, 2, "# \t", PARSE_NORMAL | PARSE_MIN_DIE)) { + char *cur_selector; + logRule_t *cur_rule; + + /* unexpected trailing token? */ + if (tok[2]) { + t = tok[2]; + goto cfgerr; + } + + cur_rule = *pp_rule = xzalloc(sizeof(*cur_rule)); + + cur_selector = tok[0]; + /* iterate through selectors: "kern.info;kern.!err;..." */ + do { + const CODE *code; + char *next_selector; + uint8_t negated_prio; /* "kern.!err" */ + uint8_t single_prio; /* "kern.=err" */ + uint32_t facmap; /* bitmap of enabled facilities */ + uint8_t primap; /* bitmap of enabled priorities */ + unsigned i; + + next_selector = strchr(cur_selector, ';'); + if (next_selector) + *next_selector++ = '\0'; + + t = strchr(cur_selector, '.'); + if (!t) { + t = cur_selector; + goto cfgerr; + } + *t++ = '\0'; /* separate facility from priority */ + + negated_prio = 0; + single_prio = 0; + if (*t == '!') { + negated_prio = 1; + ++t; + } + if (*t == '=') { + single_prio = 1; + ++t; + } + + /* parse priority */ + if (*t == '*') + primap = 0xff; /* all 8 log levels enabled */ + else { + uint8_t priority; + code = find_by_name(t, prioritynames); + if (!code) + goto cfgerr; + primap = 0; + priority = code->c_val; + if (priority == INTERNAL_NOPRI) { + /* ensure we take "enabled_facility_priomap[fac] &= 0" branch below */ + negated_prio = 1; + } else { + priority = 1 << priority; + do { + primap |= priority; + if (single_prio) + break; + priority >>= 1; + } while (priority); + if (negated_prio) + primap = ~primap; + } + } + + /* parse facility */ + if (*cur_selector == '*') + facmap = (1<<LOG_NFACILITIES) - 1; + else { + char *next_facility; + facmap = 0; + t = cur_selector; + /* iterate through facilities: "kern,daemon.<priospec>" */ + do { + next_facility = strchr(t, ','); + if (next_facility) + *next_facility++ = '\0'; + code = find_by_name(t, facilitynames); + if (!code) + goto cfgerr; + /* "mark" is not a real facility, skip it */ + if (code->c_val != INTERNAL_MARK) + facmap |= 1<<(LOG_FAC(code->c_val)); + t = next_facility; + } while (t); + } + + /* merge result with previous selectors */ + for (i = 0; i < LOG_NFACILITIES; ++i) { + if (!(facmap & (1<<i))) + continue; + if (negated_prio) + cur_rule->enabled_facility_priomap[i] &= primap; + else + cur_rule->enabled_facility_priomap[i] |= primap; + } + + cur_selector = next_selector; + } while (cur_selector); + + /* check whether current file name was mentioned in previous rules. + * temporarily use cur_rule as iterator, but *pp_rule still points to + * currently processing rule entry. + * NOTE: *pp_rule points to the current (and last in the list) rule. + */ + for (cur_rule = G.log_rules; cur_rule != *pp_rule; cur_rule = cur_rule->next) { + if (strcmp(cur_rule->file->path, tok[1]) == 0) { + /* found - reuse the same file structure */ + (*pp_rule)->file = cur_rule->file; + cur_rule = *pp_rule; + goto found; + } + } + cur_rule->file = xzalloc(sizeof(*cur_rule->file)); + cur_rule->file->fd = -1; + cur_rule->file->path = xstrdup(tok[1]); + found: + pp_rule = &cur_rule->next; + } + config_close(parser); + return; + + cfgerr: + bb_error_msg_and_die("bad line %d: wrong token '%s'", parser->lineno, t); +} +#endif + /* circular buffer variables/structures */ #if ENABLE_FEATURE_IPC_SYSLOG @@ -231,7 +428,7 @@ static void ipcsyslog_init(void) 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) + /* 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) { @@ -244,9 +441,10 @@ static void ipcsyslog_init(void) } /* Write message to shared mem buffer */ -static void log_to_shmem(const char *msg, int len) +static void log_to_shmem(const char *msg) { int old_tail, new_tail; + int len; if (semop(G.s_semid, G.SMwdn, 3) == -1) { bb_perror_msg_and_die("SMwdn"); @@ -258,7 +456,7 @@ static void log_to_shmem(const char *msg, int len) * tail's max value is (shbuf->size - 1) * Last byte of buffer is never used and remains NUL. */ - len++; /* length with NUL included */ + len = strlen(msg) + 1; /* length with NUL included */ again: old_tail = G.shbuf->tail; new_tail = old_tail + len; @@ -288,22 +486,15 @@ 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) +static void log_locally(time_t now, char *msg, logFile_t *log_file) { #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) { + if (log_file->fd >= 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 @@ -313,15 +504,15 @@ static void log_locally(time_t now, char *msg) now = time(NULL); if (G.last_log_time != now) { G.last_log_time = now; - close(G.logFD); + close(log_file->fd); goto reopen; } } else { reopen: - G.logFD = open(G.logFilePath, O_WRONLY | O_CREAT + log_file->fd = open(log_file->path, O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND | O_NONBLOCK, 0666); - if (G.logFD < 0) { + if (log_file->fd < 0) { /* cannot open logfile? - print to /dev/console then */ int fd = device_open(DEV_CONSOLE, O_WRONLY | O_NOCTTY | O_NONBLOCK); if (fd < 0) @@ -334,9 +525,9 @@ static void log_locally(time_t now, char *msg) #if ENABLE_FEATURE_ROTATE_LOGFILE { struct stat statf; - G.isRegular = (fstat(G.logFD, &statf) == 0 && S_ISREG(statf.st_mode)); + log_file->isRegular = (fstat(log_file->fd, &statf) == 0 && S_ISREG(statf.st_mode)); /* bug (mostly harmless): can wrap around if file > 4gb */ - G.curFileSize = statf.st_size; + log_file->size = statf.st_size; } #endif } @@ -346,41 +537,41 @@ static void log_locally(time_t now, char *msg) fl.l_start = 0; fl.l_len = 1; fl.l_type = F_WRLCK; - fcntl(G.logFD, F_SETLKW, &fl); + fcntl(log_file->fd, F_SETLKW, &fl); #endif #if ENABLE_FEATURE_ROTATE_LOGFILE - if (G.logFileSize && G.isRegular && G.curFileSize > G.logFileSize) { + if (G.logFileSize && log_file->isRegular && log_file->size > G.logFileSize) { if (G.logFileRotate) { /* always 0..99 */ - int i = strlen(G.logFilePath) + 3 + 1; + int i = strlen(log_file->path) + 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); + sprintf(newFile, "%s.%d", log_file->path, i); if (i == 0) break; - sprintf(oldFile, "%s.%d", G.logFilePath, --i); + sprintf(oldFile, "%s.%d", log_file->path, --i); /* ignore errors - file might be missing */ rename(oldFile, newFile); } /* newFile == "f.0" now */ - rename(G.logFilePath, newFile); + rename(log_file->path, newFile); #ifdef SYSLOGD_WRLOCK fl.l_type = F_UNLCK; - fcntl(G.logFD, F_SETLKW, &fl); + fcntl(log_file->fd, F_SETLKW, &fl); #endif - close(G.logFD); + close(log_file->fd); goto reopen; } - ftruncate(G.logFD, 0); + ftruncate(log_file->fd, 0); } - G.curFileSize += + log_file->size += #endif - full_write(G.logFD, msg, len); + full_write(log_file->fd, msg, len); #ifdef SYSLOGD_WRLOCK fl.l_type = F_UNLCK; - fcntl(G.logFD, F_SETLKW, &fl); + fcntl(log_file->fd, F_SETLKW, &fl); #endif } @@ -388,29 +579,15 @@ 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; + c_fac = find_by_val(LOG_FAC(pri) << 3, facilitynames); + if (c_fac) { + c_pri = find_by_val(LOG_PRI(pri), prioritynames); + if (c_pri) { + snprintf(res20, 20, "%s.%s", c_fac->c_name, c_pri->c_name); + return; } - snprintf(res20, 20, "<%d>", pri); } + snprintf(res20, 20, "<%d>", pri); } /* len parameter is used only for "is there a timestamp?" check. @@ -444,7 +621,32 @@ static void timestamp_and_log(int pri, char *msg, int len) } /* Log message locally (to file or shared mem) */ - log_locally(now, G.printbuf); +#if ENABLE_FEATURE_SYSLOGD_CFG + { + bool match = 0; + logRule_t *rule; + uint8_t facility = LOG_FAC(pri); + uint8_t prio_bit = 1 << LOG_PRI(pri); + + for (rule = G.log_rules; rule; rule = rule->next) { + if (rule->enabled_facility_priomap[facility] & prio_bit) { + log_locally(now, G.printbuf, rule->file); + match = 1; + } + } + if (match) + return; + } +#endif + if (LOG_PRI(pri) < G.logLevel) { +#if ENABLE_FEATURE_IPC_SYSLOG + if ((option_mask32 & OPT_circularlog) && G.shbuf) { + log_to_shmem(msg); + return; + } +#endif + log_locally(now, G.printbuf, &G.logFile); + } } static void timestamp_and_log_internal(const char *msg) @@ -489,8 +691,7 @@ static void split_escape_and_log(char *tmpbuf, int len) *q = '\0'; /* Now log it */ - if (LOG_PRI(pri) < G.logLevel) - timestamp_and_log(pri, G.parsebuf, q - G.parsebuf); + timestamp_and_log(pri, G.parsebuf, q - G.parsebuf); } } @@ -719,10 +920,12 @@ int syslogd_main(int argc UNUSED_PARAM, char **argv) 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; +#if ENABLE_FEATURE_SYSLOGD_CFG + parse_syslogdcfg(opt_f); +#endif /* Store away localhost's name before the fork */ G.hostname = safe_gethostname(); |