diff options
Diffstat (limited to 'release/src/router/busybox/sysklogd')
| -rwxr-xr-x | release/src/router/busybox/sysklogd/Config.in | 82 | ||||
| -rw-r--r-- | release/src/router/busybox/sysklogd/Makefile | 30 | ||||
| -rwxr-xr-x | release/src/router/busybox/sysklogd/Makefile.in | 35 | ||||
| -rw-r--r-- | release/src/router/busybox/sysklogd/klogd.c | 167 | ||||
| -rw-r--r-- | release/src/router/busybox/sysklogd/logger.c | 204 | ||||
| -rw-r--r-- | release/src/router/busybox/sysklogd/logread.c | 137 | ||||
| -rw-r--r-- | release/src/router/busybox/sysklogd/syslogd.c | 652 |
7 files changed, 1307 insertions, 0 deletions
diff --git a/release/src/router/busybox/sysklogd/Config.in b/release/src/router/busybox/sysklogd/Config.in new file mode 100755 index 00000000..87b9ed7a --- /dev/null +++ b/release/src/router/busybox/sysklogd/Config.in @@ -0,0 +1,82 @@ +# +# For a description of the syntax of this configuration file, +# see scripts/kbuild/config-language.txt. +# + +menu "System Logging Utilities" + +config CONFIG_SYSLOGD + bool "syslogd" + default n + help + The syslogd utility is used to record logs of all the + significant events that occur on a system. Every + message that is logged records the date and time of the + event, and will generally also record the name of the + application that generated the message. When used in + conjunction with klogd, messages from the Linux kernel + can also be recorded. This is terribly useful, + especially for finding what happened when somthing goes + wrong. And something almost always will go wrong if + you wait long enough.... + +config CONFIG_FEATURE_REMOTE_LOG + bool " Remote Log support" + default n + depends on CONFIG_SYSLOGD + help + When you enable this feature, the syslogd utility can + be used to send system log messages to another system + connected via a network. This allows the remote + machine to log all the system messages, which can be + terribly useful for reducing the number of serial + cables you use. It can also be a very good security + measure to prevent system logs from being tampered with + by an intruder. + +config CONFIG_FEATURE_IPC_SYSLOG + bool " Circular Buffer support" + default n + depends on CONFIG_SYSLOGD + help + When you enable this feature, the syslogd utility will + use a circular buffer to record system log messages. + When the buffer is filled it will continue to overwrite + the oldest messaged. This can be very useful for + systems with little or no perminant storage, since + otherwise system logs can eventually fill up your + entire filesystem, which may cause your system to + break badly. + +config CONFIG_LOGREAD + bool " logread" + default y + depends on CONFIG_FEATURE_IPC_SYSLOG + help + If you enabled Circular Buffer support, you almost + certainly want to enable this feature as well. This + utility will allow you to read the messages that are + stored in the syslogd circular buffer. + +config CONFIG_KLOGD + bool "klogd" + default n + depends on CONFIG_SYSLOGD + help + klogd is a utility which which intercepts and logs all + messages from the Linux kernel and sends the messages + out to the 'syslogd' utility so they can be logged. If + you wish to record the messages produced by the kernel, + you should enable this option. + +config CONFIG_LOGGER + bool "logger" + default n + help + The logger utility allows you to send arbitrary text + messages to the system log (i.e. the 'syslogd' utility) so + they can be logged. This is generally used to help locate + problems that occur within programs and scripts. + +endmenu + diff --git a/release/src/router/busybox/sysklogd/Makefile b/release/src/router/busybox/sysklogd/Makefile new file mode 100644 index 00000000..0c01f546 --- /dev/null +++ b/release/src/router/busybox/sysklogd/Makefile @@ -0,0 +1,30 @@ +# Makefile for busybox +# +# Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org> +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# + +TOPDIR:= ../ +SYSKLOGD_DIR:=./ +include $(TOPDIR).config +include $(TOPDIR)Rules.mak +include Makefile.in +all: $(libraries-y) +-include $(TOPDIR).depend + +clean: + rm -f *.o *.a $(AR_TARGET) + diff --git a/release/src/router/busybox/sysklogd/Makefile.in b/release/src/router/busybox/sysklogd/Makefile.in new file mode 100755 index 00000000..d088ae85 --- /dev/null +++ b/release/src/router/busybox/sysklogd/Makefile.in @@ -0,0 +1,35 @@ +# Makefile for busybox +# +# Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org> +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# + +SYSKLOGD_AR:=sysklogd.a +ifndef $(SYSKLOGD_DIR) +SYSKLOGD_DIR:=$(TOPDIR)sysklogd/ +endif + +SYSKLOGD-:= +SYSKLOGD-$(CONFIG_KLOGD) += klogd.o +SYSKLOGD-$(CONFIG_LOGGER) += logger.o +SYSKLOGD-$(CONFIG_LOGREAD) += logread.o +SYSKLOGD-$(CONFIG_SYSLOGD) += syslogd.o + +libraries-y+=$(SYSKLOGD_DIR)$(SYSKLOGD_AR) + +$(SYSKLOGD_DIR)$(SYSKLOGD_AR): $(patsubst %,$(SYSKLOGD_DIR)%, $(SYSKLOGD-y)) + $(AR) -ro $@ $(patsubst %,$(SYSKLOGD_DIR)%, $(SYSKLOGD-y)) + diff --git a/release/src/router/busybox/sysklogd/klogd.c b/release/src/router/busybox/sysklogd/klogd.c new file mode 100644 index 00000000..c132e065 --- /dev/null +++ b/release/src/router/busybox/sysklogd/klogd.c @@ -0,0 +1,167 @@ +/* vi: set sw=4 ts=4: */ +/* + * Mini klogd implementation for busybox + * + * Copyright (C) 2001 by Gennady Feldman <gfeldman@gena01.com>. + * Changes: Made this a standalone busybox module which uses standalone + * syslog() client interface. + * + * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org> + * + * Copyright (C) 2000 by Karl M. Hegbloom <karlheg@debian.org> + * + * "circular buffer" Copyright (C) 2000 by Gennady Feldman <gfeldman@gena01.com> + * + * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <signal.h> /* for our signal() handlers */ +#include <string.h> /* strncpy() */ +#include <errno.h> /* errno and friends */ +#include <unistd.h> +#include <ctype.h> +#include <sys/syslog.h> +#include <sys/klog.h> + +#include "busybox.h" + +static void klogd_signal(int sig) +{ + klogctl(7, NULL, 0); + klogctl(0, 0, 0); + /* logMessage(0, "Kernel log daemon exiting."); */ + syslog_msg(LOG_SYSLOG, LOG_NOTICE, "Kernel log daemon exiting."); + exit(TRUE); +} + +static void doKlogd(const char console_log_level) __attribute__ ((noreturn)); +static void doKlogd(const char console_log_level) +{ + int priority = LOG_INFO; + char log_buffer[4096]; + int i, n, lastc; + char *start; + + /* Set up sig handlers */ + signal(SIGINT, klogd_signal); + signal(SIGKILL, klogd_signal); + signal(SIGTERM, klogd_signal); + signal(SIGHUP, SIG_IGN); + + /* "Open the log. Currently a NOP." */ + klogctl(1, NULL, 0); + + /* Set level of kernel console messaging.. */ + if (console_log_level) + klogctl(8, NULL, console_log_level); + + syslog_msg(LOG_SYSLOG, LOG_NOTICE, "klogd started: " BB_BANNER); + + while (1) { + /* Use kernel syscalls */ + memset(log_buffer, '\0', sizeof(log_buffer)); + n = klogctl(2, log_buffer, sizeof(log_buffer)); + if (n < 0) { + char message[80]; + + if (errno == EINTR) + continue; + snprintf(message, 79, + "klogd: Error return from sys_sycall: %d - %s.\n", errno, + strerror(errno)); + syslog_msg(LOG_SYSLOG, LOG_ERR, message); + exit(1); + } + + /* klogctl buffer parsing modelled after code in dmesg.c */ + start = &log_buffer[0]; + lastc = '\0'; + for (i = 0; i < n; i++) { + if (lastc == '\0' && log_buffer[i] == '<') { + priority = 0; + i++; + while (isdigit(log_buffer[i])) { + priority = priority * 10 + (log_buffer[i] - '0'); + i++; + } + if (log_buffer[i] == '>') + i++; + start = &log_buffer[i]; + } + if (log_buffer[i] == '\n') { + log_buffer[i] = '\0'; /* zero terminate this message */ + syslog_msg(LOG_KERN, priority, start); + start = &log_buffer[i + 1]; + priority = LOG_INFO; + } + lastc = log_buffer[i]; + } + } +} + +extern int klogd_main(int argc, char **argv) +{ + /* no options, no getopt */ + int opt; + int doFork = TRUE; + unsigned char console_log_level = 7; + + /* do normal option parsing */ + while ((opt = getopt(argc, argv, "c:n")) > 0) { + switch (opt) { + case 'c': + if ((optarg == NULL) || (optarg[1] != '\0')) { + bb_show_usage(); + } + /* Valid levels are between 1 and 8 */ + console_log_level = *optarg - '1'; + if (console_log_level > 7) { + bb_show_usage(); + } + console_log_level++; + + break; + case 'n': + doFork = FALSE; + break; + default: + bb_show_usage(); + } + } + + if (doFork) { + if (daemon(0, 1) < 0) + bb_perror_msg_and_die("daemon"); +#if defined(__uClinux__) + vfork_daemon_rexec(argc, argv, "-n"); +#endif + } + doKlogd(console_log_level); + + return EXIT_SUCCESS; +} + +/* +Local Variables +c-file-style: "linux" +c-basic-offset: 4 +tab-width: 4 +End: +*/ diff --git a/release/src/router/busybox/sysklogd/logger.c b/release/src/router/busybox/sysklogd/logger.c new file mode 100644 index 00000000..252cfc49 --- /dev/null +++ b/release/src/router/busybox/sysklogd/logger.c @@ -0,0 +1,204 @@ +/* vi: set sw=4 ts=4: */ +/* + * Mini logger implementation for busybox + * + * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <stdio.h> +#include <unistd.h> +#include <sys/types.h> +#include <fcntl.h> +#include <ctype.h> +#include <string.h> +#include <stdlib.h> + +#include "busybox.h" +#if !defined CONFIG_SYSLOGD + +#define SYSLOG_NAMES +#include <sys/syslog.h> + +#else +#include <sys/syslog.h> +# ifndef __dietlibc__ + /* We have to do this since the header file defines static + * structures. Argh.... bad libc, bad, bad... + */ + typedef struct _code { + char *c_name; + int c_val; + } CODE; + extern CODE prioritynames[]; + extern CODE facilitynames[]; +# endif +#endif + +/* Decode a symbolic name to a numeric value + * this function is based on code + * Copyright (c) 1983, 1993 + * The Regents of the University of California. All rights reserved. + * + * Original copyright notice is retained at the end of this file. + */ +static int decode(char *name, CODE * codetab) +{ + CODE *c; + + if (isdigit(*name)) + return (atoi(name)); + for (c = codetab; c->c_name; c++) { + if (!strcasecmp(name, c->c_name)) { + return (c->c_val); + } + } + + return (-1); +} + +/* Decode a symbolic name to a numeric value + * this function is based on code + * Copyright (c) 1983, 1993 + * The Regents of the University of California. All rights reserved. + * + * Original copyright notice is retained at the end of this file. + */ +static int pencode(char *s) +{ + char *save; + int lev, fac = LOG_USER; + + for (save = s; *s && *s != '.'; ++s); + if (*s) { + *s = '\0'; + fac = decode(save, facilitynames); + if (fac < 0) + bb_error_msg_and_die("unknown facility name: %s", save); + *s++ = '.'; + } else { + s = save; + } + lev = decode(s, prioritynames); + if (lev < 0) + bb_error_msg_and_die("unknown priority name: %s", save); + return ((lev & LOG_PRIMASK) | (fac & LOG_FACMASK)); +} + + +extern int logger_main(int argc, char **argv) +{ + int pri = LOG_USER | LOG_NOTICE; + int option = 0; + int c, i, opt; + char buf[1024], name[128]; + + /* Fill out the name string early (may be overwritten later) */ + my_getpwuid(name, geteuid()); + + /* Parse any options */ + while ((opt = getopt(argc, argv, "p:st:")) > 0) { + switch (opt) { + case 's': + option |= LOG_PERROR; + break; + case 'p': + pri = pencode(optarg); + break; + case 't': + safe_strncpy(name, optarg, sizeof(name)); + break; + default: + bb_show_usage(); + } + } + + openlog(name, option, (pri | LOG_FACMASK)); + if (optind == argc) { + do { + /* read from stdin */ + i = 0; + while ((c = getc(stdin)) != EOF && c != '\n' && + i < (sizeof(buf)-1)) { + buf[i++] = c; + } + if (i > 0) { + buf[i++] = '\0'; + syslog(pri, "%s", buf); + } + } while (c != EOF); + } else { + char *message = NULL; + int len = argc - optind; /* for the space between the args + and '\0' */ + opt = len; + argv += optind; + for (i = 0; i < opt; i++) { + len += strlen(*argv); + message = xrealloc(message, len); + if(!i) + message[0] = 0; + else + strcat(message, " "); + strcat(message, *argv); + argv++; + } + syslog(pri, "%s", message); + } + + closelog(); + return EXIT_SUCCESS; +} + + +/*- + * Copyright (c) 1983, 1993 + * The Regents of the University of California. All rights reserved. + * + * This is the original license statement for the decode and pencode functions. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change + * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change> + * + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + + + diff --git a/release/src/router/busybox/sysklogd/logread.c b/release/src/router/busybox/sysklogd/logread.c new file mode 100644 index 00000000..2692efbe --- /dev/null +++ b/release/src/router/busybox/sysklogd/logread.c @@ -0,0 +1,137 @@ +/* vi: set sw=4 ts=4: */ +/* + * circular buffer syslog implementation for busybox + * + * Copyright (C) 2000 by Gennady Feldman <gfeldman@gena01.com> + * + * Maintainer: Gennady Feldman <gfeldman@gena01.com> as of Mar 12, 2001 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + * 02111-1307 USA + * + */ + + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ipc.h> +#include <sys/types.h> +#include <sys/sem.h> +#include <sys/shm.h> +#include <signal.h> +#include <setjmp.h> +#include "busybox.h" + +static const long KEY_ID = 0x414e4547; /*"GENA"*/ + +static struct shbuf_ds { + int size; // size of data written + int head; // start of message list + int tail; // end of message list + char data[1]; // data/messages +} *buf = NULL; // shared memory pointer + + +// Semaphore operation structures +static struct sembuf SMrup[1] = {{0, -1, IPC_NOWAIT | SEM_UNDO}}; // set SMrup +static struct sembuf SMrdn[2] = {{1, 0}, {0, +1, SEM_UNDO}}; // set SMrdn + +static int log_shmid = -1; // ipc shared memory id +static int log_semid = -1; // ipc semaphore id +static jmp_buf jmp_env; + +static void error_exit(const char *str); +static void interrupted(int sig); + +/* + * sem_up - up()'s a semaphore. + */ +static inline void sem_up(int semid) +{ + if ( semop(semid, SMrup, 1) == -1 ) + error_exit("semop[SMrup]"); +} + +/* + * sem_down - down()'s a semaphore + */ +static inline void sem_down(int semid) +{ + if ( semop(semid, SMrdn, 2) == -1 ) + error_exit("semop[SMrdn]"); +} + +extern int logread_main(int argc, char **argv) +{ + int i; + + /* no options, no getopt */ + if (argc > 1) + bb_show_usage(); + + // handle intrrupt signal + if (setjmp(jmp_env)) goto output_end; + + // attempt to redefine ^C signal + signal(SIGINT, interrupted); + + if ( (log_shmid = shmget(KEY_ID, 0, 0)) == -1) + error_exit("Can't find circular buffer"); + + // Attach shared memory to our char* + if ( (buf = shmat(log_shmid, NULL, SHM_RDONLY)) == NULL) + error_exit("Can't get access to circular buffer from syslogd"); + + if ( (log_semid = semget(KEY_ID, 0, 0)) == -1) + error_exit("Can't get access to semaphone(s) for circular buffer from syslogd"); + + sem_down(log_semid); + // Read Memory + i=buf->head; + + //printf("head: %i tail: %i size: %i\n",buf->head,buf->tail,buf->size); + if (buf->head == buf->tail) { + printf("<empty syslog>\n"); + } + + while ( i != buf->tail) { + printf("%s", buf->data+i); + i+= strlen(buf->data+i) + 1; + if (i >= buf->size ) + i=0; + } + sem_up(log_semid); + +output_end: + if (log_shmid != -1) + shmdt(buf); + + return EXIT_SUCCESS; +} + +static void interrupted(int sig){ + signal(SIGINT, SIG_IGN); + longjmp(jmp_env, 1); +} + +static void error_exit(const char *str){ + perror(str); + //release all acquired resources + if (log_shmid != -1) + shmdt(buf); + + exit(1); +} diff --git a/release/src/router/busybox/sysklogd/syslogd.c b/release/src/router/busybox/sysklogd/syslogd.c new file mode 100644 index 00000000..c554536c --- /dev/null +++ b/release/src/router/busybox/sysklogd/syslogd.c @@ -0,0 +1,652 @@ +/* vi: set sw=4 ts=4: */ +/* + * Mini syslogd implementation for busybox + * + * Copyright (C) 1999-2003 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 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <netdb.h> +#include <paths.h> +#include <signal.h> +#include <stdarg.h> +#include <time.h> +#include <string.h> +#include <unistd.h> +#include <sys/socket.h> +#include <sys/types.h> +#include <sys/un.h> +#include <sys/param.h> + +#include "busybox.h" + +/* SYSLOG_NAMES defined to pull some extra junk from syslog.h */ +#define SYSLOG_NAMES +#include <sys/syslog.h> +#include <sys/uio.h> + +/* Path for the file where all log messages are written */ +#define __LOG_FILE "/var/log/messages" + +/* Path to the unix socket */ +static char lfile[MAXPATHLEN]; + +static char *logFilePath = __LOG_FILE; + +/* interval between marks in seconds */ +static int MarkInterval = 20 * 60; + +/* localhost's name */ +static char LocalHostName[64]; + +#ifdef CONFIG_FEATURE_REMOTE_LOG +#include <netinet/in.h> +/* udp socket for logging to remote host */ +static int remotefd = -1; + +/* where do we log? */ +static char *RemoteHost; + +/* what port to log to? */ +static int RemotePort = 514; + +/* To remote log or not to remote log, that is the question. */ +static int doRemoteLog = FALSE; +static int local_logging = FALSE; +#endif + + +#define MAXLINE 1024 /* maximum line length */ + + +/* circular buffer variables/structures */ +#ifdef CONFIG_FEATURE_IPC_SYSLOG +#include <sys/ipc.h> +#include <sys/sem.h> +#include <sys/shm.h> + +/* our shared key */ +static const long KEY_ID = 0x414e4547; /*"GENA" */ + +// Semaphore operation structures +static struct shbuf_ds { + int size; // size of data written + int head; // start of message list + int tail; // end of message list + char data[1]; // data/messages +} *buf = NULL; // shared memory pointer + +static struct sembuf SMwup[1] = { {1, -1, IPC_NOWAIT} }; // set SMwup +static struct sembuf SMwdn[3] = { {0, 0}, {1, 0}, {1, +1} }; // set SMwdn + +static int shmid = -1; // ipc shared memory id +static int s_semid = -1; // ipc semaphore id +int data_size = 16000; // data size +int shm_size = 16000 + sizeof(*buf); // our buffer size +static int circular_logging = FALSE; + +/* + * sem_up - up()'s a semaphore. + */ +static inline void sem_up(int semid) +{ + if (semop(semid, SMwup, 1) == -1) { + bb_perror_msg_and_die("semop[SMwup]"); + } +} + +/* + * sem_down - down()'s a semaphore + */ +static inline void sem_down(int semid) +{ + if (semop(semid, SMwdn, 3) == -1) { + bb_perror_msg_and_die("semop[SMwdn]"); + } +} + + +void ipcsyslog_cleanup(void) +{ + printf("Exiting Syslogd!\n"); + if (shmid != -1) { + shmdt(buf); + } + + if (shmid != -1) { + shmctl(shmid, IPC_RMID, NULL); + } + if (s_semid != -1) { + semctl(s_semid, 0, IPC_RMID, 0); + } +} + +void ipcsyslog_init(void) +{ + if (buf == NULL) { + if ((shmid = shmget(KEY_ID, shm_size, IPC_CREAT | 1023)) == -1) { + bb_perror_msg_and_die("shmget"); + } + + if ((buf = shmat(shmid, NULL, 0)) == NULL) { + bb_perror_msg_and_die("shmat"); + } + + buf->size = data_size; + buf->head = buf->tail = 0; + + // we'll trust the OS to set initial semval to 0 (let's hope) + if ((s_semid = semget(KEY_ID, 2, IPC_CREAT | IPC_EXCL | 1023)) == -1) { + if (errno == EEXIST) { + if ((s_semid = semget(KEY_ID, 2, 0)) == -1) { + bb_perror_msg_and_die("semget"); + } + } else { + bb_perror_msg_and_die("semget"); + } + } + } else { + printf("Buffer already allocated just grab the semaphore?"); + } +} + +/* write message to buffer */ +void circ_message(const char *msg) +{ + int l = strlen(msg) + 1; /* count the whole message w/ '\0' included */ + + sem_down(s_semid); + + /* + * Circular Buffer Algorithm: + * -------------------------- + * + * Start-off w/ empty buffer of specific size SHM_SIZ + * Start filling it up w/ messages. I use '\0' as separator to break up messages. + * This is also very handy since we can do printf on message. + * + * Once the buffer is full we need to get rid of the first message in buffer and + * insert the new message. (Note: if the message being added is >1 message then + * we will need to "remove" >1 old message from the buffer). The way this is done + * is the following: + * When we reach the end of the buffer we set a mark and start from the beginning. + * Now what about the beginning and end of the buffer? Well we have the "head" + * index/pointer which is the starting point for the messages and we have "tail" + * index/pointer which is the ending point for the messages. When we "display" the + * messages we start from the beginning and continue until we reach "tail". If we + * reach end of buffer, then we just start from the beginning (offset 0). "head" and + * "tail" are actually offsets from the beginning of the buffer. + * + * Note: This algorithm uses Linux IPC mechanism w/ shared memory and semaphores to provide + * a threasafe way of handling shared memory operations. + */ + if ((buf->tail + l) < buf->size) { + /* before we append the message we need to check the HEAD so that we won't + overwrite any of the message that we still need and adjust HEAD to point + to the next message! */ + if (buf->tail < buf->head) { + if ((buf->tail + l) >= buf->head) { + /* we need to move the HEAD to point to the next message + * Theoretically we have enough room to add the whole message to the + * buffer, because of the first outer IF statement, so we don't have + * to worry about overflows here! + */ + int k = buf->tail + l - buf->head; /* we need to know how many bytes + we are overwriting to make + enough room */ + char *c = + memchr(buf->data + buf->head + k, '\0', + buf->size - (buf->head + k)); + if (c != NULL) { /* do a sanity check just in case! */ + buf->head = c - buf->data + 1; /* we need to convert pointer to + offset + skip the '\0' since + we need to point to the beginning + of the next message */ + /* Note: HEAD is only used to "retrieve" messages, it's not used + when writing messages into our buffer */ + } else { /* show an error message to know we messed up? */ + printf("Weird! Can't find the terminator token??? \n"); + buf->head = 0; + } + } + } + + /* in other cases no overflows have been done yet, so we don't care! */ + /* we should be ok to append the message now */ + strncpy(buf->data + buf->tail, msg, l); /* append our message */ + buf->tail += l; /* count full message w/ '\0' terminating char */ + } else { + /* we need to break up the message and "circle" it around */ + char *c; + int k = buf->tail + l - buf->size; /* count # of bytes we don't fit */ + + /* We need to move HEAD! This is always the case since we are going + * to "circle" the message. + */ + c = memchr(buf->data + k, '\0', buf->size - k); + + if (c != NULL) { /* if we don't have '\0'??? weird!!! */ + /* move head pointer */ + buf->head = c - buf->data + 1; + + /* now write the first part of the message */ + strncpy(buf->data + buf->tail, msg, l - k - 1); + + /* ALWAYS terminate end of buffer w/ '\0' */ + buf->data[buf->size - 1] = '\0'; + + /* now write out the rest of the string to the beginning of the buffer */ + strcpy(buf->data, &msg[l - k - 1]); + + /* we need to place the TAIL at the end of the message */ + buf->tail = k + 1; + } else { + printf + ("Weird! Can't find the terminator token from the beginning??? \n"); + buf->head = buf->tail = 0; /* reset buffer, since it's probably corrupted */ + } + + } + sem_up(s_semid); +} +#endif /* CONFIG_FEATURE_IPC_SYSLOG */ + +/* Note: There is also a function called "message()" in init.c */ +/* Print a message to the log file. */ +static void message(char *fmt, ...) __attribute__ ((format(printf, 1, 2))); +static void message(char *fmt, ...) +{ + int fd; + struct flock fl; + va_list arguments; + + fl.l_whence = SEEK_SET; + fl.l_start = 0; + fl.l_len = 1; + +#ifdef CONFIG_FEATURE_IPC_SYSLOG + if ((circular_logging == TRUE) && (buf != NULL)) { + char b[1024]; + + va_start(arguments, fmt); + vsnprintf(b, sizeof(b) - 1, fmt, arguments); + va_end(arguments); + circ_message(b); + + } else +#endif + if ((fd = + device_open(logFilePath, + O_WRONLY | O_CREAT | O_NOCTTY | O_APPEND | + O_NONBLOCK)) >= 0) { + fl.l_type = F_WRLCK; + fcntl(fd, F_SETLKW, &fl); + va_start(arguments, fmt); + vdprintf(fd, fmt, arguments); + va_end(arguments); + fl.l_type = F_UNLCK; + fcntl(fd, F_SETLKW, &fl); + close(fd); + } else { + /* Always send console messages to /dev/console so people will see them. */ + if ((fd = + device_open(_PATH_CONSOLE, + O_WRONLY | O_NOCTTY | O_NONBLOCK)) >= 0) { + va_start(arguments, fmt); + vdprintf(fd, fmt, arguments); + va_end(arguments); + close(fd); + } else { + fprintf(stderr, "Bummer, can't print: "); + va_start(arguments, fmt); + vfprintf(stderr, fmt, arguments); + fflush(stderr); + va_end(arguments); + } + } +} + +static void logMessage(int pri, char *msg) +{ + time_t now; + char *timestamp; + static char res[20] = ""; + CODE *c_pri, *c_fac; + + if (pri != 0) { + for (c_fac = facilitynames; + c_fac->c_name && !(c_fac->c_val == LOG_FAC(pri) << 3); c_fac++); + for (c_pri = prioritynames; + c_pri->c_name && !(c_pri->c_val == LOG_PRI(pri)); c_pri++); + if (c_fac->c_name == NULL || c_pri->c_name == NULL) { + snprintf(res, sizeof(res), "<%d>", pri); + } else { + snprintf(res, sizeof(res), "%s.%s", c_fac->c_name, c_pri->c_name); + } + } + + if (strlen(msg) < 16 || msg[3] != ' ' || msg[6] != ' ' || + msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') { + time(&now); + timestamp = ctime(&now) + 4; + timestamp[15] = '\0'; + } else { + timestamp = msg; + timestamp[15] = '\0'; + msg += 16; + } + + /* todo: supress duplicates */ + +#ifdef CONFIG_FEATURE_REMOTE_LOG + /* send message to remote logger */ + if (-1 != remotefd) { + static const int IOV_COUNT = 2; + struct iovec iov[IOV_COUNT]; + struct iovec *v = iov; + + memset(&res, 0, sizeof(res)); + snprintf(res, sizeof(res), "<%d>", pri); + v->iov_base = res; + v->iov_len = strlen(res); + v++; + + v->iov_base = msg; + v->iov_len = strlen(msg); + writev_retry: + if ((-1 == writev(remotefd, iov, IOV_COUNT)) && (errno == EINTR)) { + goto writev_retry; + } + } + if (local_logging == TRUE) +#endif + /* now spew out the message to wherever it is supposed to go */ + message("%s %s %s %s\n", timestamp, LocalHostName, res, msg); +} + +static void quit_signal(int sig) +{ + logMessage(LOG_SYSLOG | LOG_INFO, "System log daemon exiting."); + unlink(lfile); +#ifdef CONFIG_FEATURE_IPC_SYSLOG + ipcsyslog_cleanup(); +#endif + + exit(TRUE); +} + +static void domark(int sig) +{ + if (MarkInterval > 0) { + logMessage(LOG_SYSLOG | LOG_INFO, "-- MARK --"); + alarm(MarkInterval); + } +} + +/* This must be a #define, since when CONFIG_DEBUG and BUFFERS_GO_IN_BSS are + * enabled, we otherwise get a "storage size isn't constant error. */ +static int serveConnection(char *tmpbuf, int n_read) +{ + char *p = tmpbuf; + + while (p < tmpbuf + n_read) { + + int pri = (LOG_USER | LOG_NOTICE); + int num_lt = 0; + char line[MAXLINE + 1]; + unsigned char c; + char *q = line; + + while ((c = *p) && q < &line[sizeof(line) - 1]) { + if (c == '<' && num_lt == 0) { + /* Parse the magic priority number. */ + num_lt++; + pri = 0; + while (isdigit(*(++p))) { + pri = 10 * pri + (*p - '0'); + } + if (pri & ~(LOG_FACMASK | LOG_PRIMASK)) { + pri = (LOG_USER | LOG_NOTICE); + } + } else if (c == '\n') { + *q++ = ' '; + } else if (iscntrl(c) && (c < 0177)) { + *q++ = '^'; + *q++ = c ^ 0100; + } else { + *q++ = c; + } + p++; + } + *q = '\0'; + p++; + /* Now log it */ + logMessage(pri, line); + } + return n_read; +} + + +#ifdef CONFIG_FEATURE_REMOTE_LOG +static void init_RemoteLog(void) +{ + + struct sockaddr_in remoteaddr; + struct hostent *hostinfo; + int len = sizeof(remoteaddr); + + memset(&remoteaddr, 0, len); + + remotefd = socket(AF_INET, SOCK_DGRAM, 0); + + if (remotefd < 0) { + bb_error_msg_and_die("cannot create socket"); + } + + hostinfo = xgethostbyname(RemoteHost); + + remoteaddr.sin_family = AF_INET; + remoteaddr.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list; + remoteaddr.sin_port = htons(RemotePort); + + /* Since we are using UDP sockets, connect just sets the default host and port + * for future operations + */ + if (0 != (connect(remotefd, (struct sockaddr *) &remoteaddr, len))) { + bb_error_msg_and_die("cannot connect to remote host %s:%d", RemoteHost, + RemotePort); + } + +} +#endif + +static void doSyslogd(void) __attribute__ ((noreturn)); +static void doSyslogd(void) +{ + struct sockaddr_un sunx; + socklen_t addrLength; + + 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, domark); + alarm(MarkInterval); + + /* Create the syslog file so realpath() can work. */ + if (realpath(_PATH_LOG, lfile) != NULL) { + unlink(lfile); + } + + memset(&sunx, 0, sizeof(sunx)); + sunx.sun_family = AF_UNIX; + strncpy(sunx.sun_path, lfile, sizeof(sunx.sun_path)); + if ((sock_fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) { + bb_perror_msg_and_die("Couldn't get file descriptor for socket " + _PATH_LOG); + } + + addrLength = sizeof(sunx.sun_family) + strlen(sunx.sun_path); + if (bind(sock_fd, (struct sockaddr *) &sunx, addrLength) < 0) { + bb_perror_msg_and_die("Could not connect to socket " _PATH_LOG); + } + + if (chmod(lfile, 0666) < 0) { + bb_perror_msg_and_die("Could not set permission on " _PATH_LOG); + } +#ifdef CONFIG_FEATURE_IPC_SYSLOG + if (circular_logging == TRUE) { + ipcsyslog_init(); + } +#endif + +#ifdef CONFIG_FEATURE_REMOTE_LOG + if (doRemoteLog == TRUE) { + init_RemoteLog(); + } +#endif + + logMessage(LOG_SYSLOG | LOG_INFO, "syslogd started: " BB_BANNER); + + 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 error"); + } + + if (FD_ISSET(sock_fd, &fds)) { + int i; + + RESERVE_CONFIG_BUFFER(tmpbuf, MAXLINE + 1); + + memset(tmpbuf, '\0', MAXLINE + 1); + if ((i = recv(sock_fd, tmpbuf, MAXLINE, 0)) > 0) { + serveConnection(tmpbuf, i); + } else { + bb_perror_msg_and_die("UNIX socket error"); + } + RELEASE_CONFIG_BUFFER(tmpbuf); + } /* FD_ISSET() */ + } /* for main loop */ +} + +extern int syslogd_main(int argc, char **argv) +{ + int opt; + +#if ! defined(__uClinux__) + int doFork = TRUE; +#endif + + char *p; + + /* do normal option parsing */ + while ((opt = getopt(argc, argv, "m:nO:R:LC")) > 0) { + switch (opt) { + case 'm': + MarkInterval = atoi(optarg) * 60; + break; +#if ! defined(__uClinux__) + case 'n': + doFork = FALSE; + break; +#endif + case 'O': + logFilePath = bb_xstrdup(optarg); + break; +#ifdef CONFIG_FEATURE_REMOTE_LOG + case 'R': + RemoteHost = bb_xstrdup(optarg); + if ((p = strchr(RemoteHost, ':'))) { + RemotePort = atoi(p + 1); + *p = '\0'; + } + doRemoteLog = TRUE; + break; + case 'L': + local_logging = TRUE; + break; +#endif +#ifdef CONFIG_FEATURE_IPC_SYSLOG + case 'C': + circular_logging = TRUE; + break; +#endif + default: + bb_show_usage(); + } + } + +#ifdef CONFIG_FEATURE_REMOTE_LOG + /* If they have not specified remote logging, then log locally */ + if (doRemoteLog == FALSE) + local_logging = TRUE; +#endif + + + /* Store away localhost's name before the fork */ + gethostname(LocalHostName, sizeof(LocalHostName)); + if ((p = strchr(LocalHostName, '.'))) { + *p++ = '\0'; + } + + umask(0); + + if ((doFork == TRUE) && (daemon(0, 1) < 0)) { + bb_perror_msg_and_die("daemon"); +#if ! defined(__uClinux__) + vfork_daemon_rexec(argc, argv, "-n"); +#endif + } + doSyslogd(); + + return EXIT_SUCCESS; +} + +/* +Local Variables +c-file-style: "linux" +c-basic-offset: 4 +tab-width: 4 +End: +*/ |