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/*
# log: processing of all outgoing messages
#
# Copyright (C) 2007-2021 Yves Rutschle
#
# 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.
#
# The full text for the General Public License is here:
# http://www.gnu.org/licenses/gpl.html
*/
#define SYSLOG_NAMES
#define _GNU_SOURCE
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include "sslh-conf.h"
#include "common.h"
#include "log.h"
msg_info msg_config = {
LOG_INFO,
&cfg.verbose_config
};
msg_info msg_config_error = {
LOG_ERR,
&cfg.verbose_config_error
};
msg_info msg_fd = {
LOG_DEBUG,
&cfg.verbose_fd
};
/* Internal errors: inconsistent states, impossible values, things that should never happen, and are therefore the sign of memory corruption: hence the LOG_CRIT */
msg_info msg_int_error = {
LOG_CRIT,
&cfg.verbose_system_error
};
/* System errors: when the system around us fails us: memory allocation, fork, ... */
msg_info msg_system_error = {
LOG_ERR,
&cfg.verbose_system_error
};
msg_info msg_packets = {
LOG_INFO,
&cfg.verbose_packets
};
/* additional info when attempting outgoing connections */
msg_info msg_connections_try = {
LOG_DEBUG,
&cfg.verbose_connections_try
};
/* Connection information and failures (e.g. forbidden by policy) */
msg_info msg_connections = {
LOG_INFO,
&cfg.verbose_connections
};
/* Connection failures, e.g. target server not present */
msg_info msg_connections_error = {
LOG_ERR,
&cfg.verbose_connections_error
};
/* comment the probing process */
msg_info msg_probe_info = {
LOG_INFO,
&cfg.verbose_probe_info
};
/* probing errors, e.g. inconsistent data in connections */
msg_info msg_probe_error = {
LOG_ERR,
&cfg.verbose_probe_error
};
/* Bitmasks in verbose-* values */
#define MSG_STDOUT 1
#define MSG_SYSLOG 2
#define MSG_FILE 4
static FILE* logfile_fp = NULL;
/* Prints a message to stderr and/or syslog if appropriate */
void print_message(msg_info info, const char* str, ...)
{
va_list ap;
if ((*info.verbose & MSG_STDOUT) && ! cfg.inetd) {
va_start(ap, str);
vfprintf(stderr, str, ap);
va_end(ap);
}
if (*info.verbose & MSG_SYSLOG) {
va_start(ap, str);
vsyslog(info.log_level, str, ap);
va_end(ap);
}
if (*info.verbose & MSG_FILE && logfile_fp != NULL) {
va_start(ap, str);
vfprintf(logfile_fp, str, ap);
fflush(logfile_fp);
va_end(ap);
}
}
static int do_syslog = 1; /* Should we syslog? controled by syslog_facility = "none" */
/* Open syslog connection with appropriate banner;
* banner is made up of basename(bin_name)+"[pid]" */
void setup_syslog(const char* bin_name) {
char *name1, *name2;
int res, fn;
if (!strcmp(cfg.syslog_facility, "none")) {
do_syslog = 0;
return;
}
name1 = strdup(bin_name);
res = asprintf(&name2, "%s[%d]", basename(name1), getpid());
CHECK_RES_DIE(res, "asprintf");
for (fn = 0; facilitynames[fn].c_val != -1; fn++)
if (strcmp(facilitynames[fn].c_name, cfg.syslog_facility) == 0)
break;
if (facilitynames[fn].c_val == -1) {
fprintf(stderr, "Unknown facility %s\n", cfg.syslog_facility);
exit(1);
}
openlog(name2, LOG_CONS, facilitynames[fn].c_val);
free(name1);
/* Don't free name2, as openlog(3) uses it (at least in glibc) */
}
void setup_logfile()
{
if (cfg.logfile == NULL)
{
return;
}
logfile_fp = fopen(cfg.logfile, "a");
if (logfile_fp == NULL)
{
fprintf(stderr, "Could not open logfile %s for writing: %s\n", cfg.logfile, strerror(errno));
exit(1);
}
}
void close_logfile()
{
if (logfile_fp != NULL)
{
fclose(logfile_fp);
logfile_fp = NULL;
}
}
/* syslogs who connected to where
* desc: string description of the connection. if NULL, log_connection will
* manage on its own
* cnx: connection descriptor
* */
void log_connection(struct connection_desc* desc, const struct connection *cnx)
{
struct connection_desc d;
if (cnx->proto->log_level < 1)
return;
if (!desc) {
desc = &d;
if (!get_connection_desc(desc, cnx)) {
print_message(msg_connections, "%s: lost incoming connection\n",
cnx->proto->name);
return;
}
}
print_message(msg_connections, "%s:connection from %s to %s forwarded from %s to %s\n",
cnx->proto->name,
desc->peer,
desc->service,
desc->local,
desc->target);
}
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