da152331cf
Logging to file is going to add some further complexity that we don't want to squeeze into util.c. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
// SPDX-License-Identifier: AGPL-3.0-or-later
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/* PASST - Plug A Simple Socket Transport
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* for qemu/UNIX domain socket mode
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*
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* PASTA - Pack A Subtle Tap Abstraction
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* for network namespace/tap device mode
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*
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* log.c - Logging functions
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*
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* Copyright (c) 2020-2022 Red Hat GmbH
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* Author: Stefano Brivio <sbrivio@redhat.com>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <time.h>
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#include <syslog.h>
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#include <stdarg.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include "log.h"
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/* For __openlog() and __setlogmask() wrappers, and passt_vsyslog() */
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static int log_mask;
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static int log_sock = -1;
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static char log_ident[BUFSIZ];
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static int log_opt;
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static time_t log_debug_start;
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int log_trace;
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#define logfn(name, level) \
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void name(const char *format, ...) { \
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struct timespec tp; \
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va_list args; \
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\
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if (setlogmask(0) & LOG_MASK(LOG_DEBUG)) { \
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clock_gettime(CLOCK_REALTIME, &tp); \
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fprintf(stderr, "%li.%04li: ", \
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tp.tv_sec - log_debug_start, \
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tp.tv_nsec / (100L * 1000)); \
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} else { \
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va_start(args, format); \
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passt_vsyslog(level, format, args); \
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va_end(args); \
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} \
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\
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if (setlogmask(0) & LOG_MASK(LOG_DEBUG) || \
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setlogmask(0) == LOG_MASK(LOG_EMERG)) { \
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va_start(args, format); \
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(void)vfprintf(stderr, format, args); \
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va_end(args); \
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if (format[strlen(format)] != '\n') \
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fprintf(stderr, "\n"); \
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} \
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}
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logfn(err, LOG_ERR)
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logfn(warn, LOG_WARNING)
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logfn(info, LOG_INFO)
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logfn(debug, LOG_DEBUG)
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void trace_init(int enable)
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{
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log_trace = enable;
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}
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/**
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* __openlog() - Non-optional openlog() wrapper, to allow custom vsyslog()
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* @ident: openlog() identity (program name)
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* @option: openlog() options
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* @facility: openlog() facility (LOG_DAEMON)
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*/
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void __openlog(const char *ident, int option, int facility)
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{
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struct timespec tp;
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clock_gettime(CLOCK_REALTIME, &tp);
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log_debug_start = tp.tv_sec;
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if (log_sock < 0) {
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struct sockaddr_un a = { .sun_family = AF_UNIX, };
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log_sock = socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
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if (log_sock < 0)
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return;
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strncpy(a.sun_path, _PATH_LOG, sizeof(a.sun_path));
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if (connect(log_sock, (const struct sockaddr *)&a, sizeof(a))) {
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close(log_sock);
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log_sock = -1;
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return;
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}
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}
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log_mask |= facility;
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strncpy(log_ident, ident, sizeof(log_ident) - 1);
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log_opt = option;
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openlog(ident, option, facility);
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}
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/**
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* __setlogmask() - setlogmask() wrapper, to allow custom vsyslog()
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* @mask: Same as setlogmask() mask
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*/
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void __setlogmask(int mask)
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{
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log_mask = mask;
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setlogmask(mask);
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}
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/**
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* passt_vsyslog() - vsyslog() implementation not using heap memory
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* @pri: Facility and level map, same as priority for vsyslog()
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* @format: Same as vsyslog() format
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* @ap: Same as vsyslog() ap
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*/
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void passt_vsyslog(int pri, const char *format, va_list ap)
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{
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char buf[BUFSIZ];
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int n;
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if (!(LOG_MASK(LOG_PRI(pri)) & log_mask))
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return;
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/* Send without name and timestamp, the system logger should add them */
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n = snprintf(buf, BUFSIZ, "<%i> ", pri);
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n += vsnprintf(buf + n, BUFSIZ - n, format, ap);
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if (format[strlen(format)] != '\n')
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n += snprintf(buf + n, BUFSIZ - n, "\n");
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if (log_opt & LOG_PERROR)
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fprintf(stderr, "%s", buf + sizeof("<0>"));
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if (send(log_sock, buf, n, 0) != n)
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fprintf(stderr, "Failed to send %i bytes to syslog\n", n);
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}
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