ModSyslog.cc

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/*
 * Copyright (C) 1996-2025 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
/* DEBUG: section 50    Log file handling */
 
#include "squid.h"
#include "debug/Stream.h"
 
#if HAVE_SYSLOG
 
#include "log/File.h"
#include "log/ModSyslog.h"
 
/* Define LOG_AUTHPRIV as LOG_AUTH on systems still using the old deprecated LOG_AUTH */
#if !defined(LOG_AUTHPRIV) && defined(LOG_AUTH)
#define LOG_AUTHPRIV LOG_AUTH
#endif
 
typedef struct {
    const char *name;
    int value;
} syslog_symbol_t;
 
static int
syslog_ntoa(const char *s)
{
#define syslog_symbol(a) #a, a
    static syslog_symbol_t symbols[] = {
#ifdef LOG_AUTHPRIV
        {syslog_symbol(LOG_AUTHPRIV)},
#endif
#ifdef LOG_DAEMON
        {syslog_symbol(LOG_DAEMON)},
#endif
#ifdef LOG_LOCAL0
        {syslog_symbol(LOG_LOCAL0)},
#endif
#ifdef LOG_LOCAL1
        {syslog_symbol(LOG_LOCAL1)},
#endif
#ifdef LOG_LOCAL2
        {syslog_symbol(LOG_LOCAL2)},
#endif
#ifdef LOG_LOCAL3
        {syslog_symbol(LOG_LOCAL3)},
#endif
#ifdef LOG_LOCAL4
        {syslog_symbol(LOG_LOCAL4)},
#endif
#ifdef LOG_LOCAL5
        {syslog_symbol(LOG_LOCAL5)},
#endif
#ifdef LOG_LOCAL6
        {syslog_symbol(LOG_LOCAL6)},
#endif
#ifdef LOG_LOCAL7
        {syslog_symbol(LOG_LOCAL7)},
#endif
#ifdef LOG_USER
        {syslog_symbol(LOG_USER)},
#endif
#ifdef LOG_ERR
        {syslog_symbol(LOG_ERR)},
#endif
#ifdef LOG_WARNING
        {syslog_symbol(LOG_WARNING)},
#endif
#ifdef LOG_NOTICE
        {syslog_symbol(LOG_NOTICE)},
#endif
#ifdef LOG_INFO
        {syslog_symbol(LOG_INFO)},
#endif
#ifdef LOG_DEBUG
        {syslog_symbol(LOG_DEBUG)},
#endif
        {nullptr, 0}
    };
    syslog_symbol_t *p;
 
    for (p = symbols; p->name != nullptr; ++p)
        if (!strcmp(s, p->name) || !strcasecmp(s, p->name + 4))
            return p->value;
 
    debugs(1, DBG_IMPORTANT, "ERROR: Unknown syslog facility/priority '" << s << "'");
    return 0;
}
 
typedef struct {
    int syslog_priority;
} l_syslog_t;
 
#define PRIORITY_MASK (LOG_ERR | LOG_WARNING | LOG_NOTICE | LOG_INFO | LOG_DEBUG)
 
static void
logfile_mod_syslog_writeline(Logfile * lf, const char *buf, size_t)
{
    l_syslog_t *ll = (l_syslog_t *) lf->data;
    syslog(ll->syslog_priority, "%s", (char *) buf);
}
 
static void
logfile_mod_syslog_linestart(Logfile *)
{
}
 
static void
logfile_mod_syslog_lineend(Logfile *)
{
}
 
static void
logfile_mod_syslog_flush(Logfile *)
{
}
 
static void
logfile_mod_syslog_rotate(Logfile *, const int16_t)
{
}
 
static void
logfile_mod_syslog_close(Logfile *lf)
{
    xfree(lf->data);
    lf->data = nullptr;
}
 
/*
 * This code expects the path to be syslog:<priority>
 */
int
logfile_mod_syslog_open(Logfile * lf, const char *path, size_t, int)
{
    lf->f_close = logfile_mod_syslog_close;
    lf->f_linewrite = logfile_mod_syslog_writeline;
    lf->f_linestart = logfile_mod_syslog_linestart;
    lf->f_lineend = logfile_mod_syslog_lineend;
    lf->f_flush = logfile_mod_syslog_flush;
    lf->f_rotate = logfile_mod_syslog_rotate;
 
    l_syslog_t *ll = static_cast<l_syslog_t*>(xcalloc(1, sizeof(*ll)));
    lf->data = ll;
 
    ll->syslog_priority = LOG_INFO;
 
    if (path[6] != '\0') {
        char *priority = xstrdup(path);
        char *facility = (char *) strchr(priority, '.');
        if (!facility)
            facility = (char *) strchr(priority, '|');
        if (facility) {
            *facility = '\0';
            ++facility;
            ll->syslog_priority |= syslog_ntoa(facility);
        }
        ll->syslog_priority |= syslog_ntoa(priority);
        xfree(priority);
        if ((ll->syslog_priority & PRIORITY_MASK) == 0)
            ll->syslog_priority |= LOG_INFO;
    }
 
    return 1;
}
#endif