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// SPDX-License-Identifier: GPL-2.0+
/*
* Log to syslog.
*
* Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
*/
#include <common.h>
#include <log.h>
#include <net.h>
DECLARE_GLOBAL_DATA_PTR;
#define BUFFER_SIZE 480
static void append(char **buf, char *buf_end, const char *fmt, ...)
{
va_list args;
size_t size = buf_end - *buf;
va_start(args, fmt);
vsnprintf(*buf, size, fmt, args);
va_end(args);
*buf += strlen(*buf);
}
static int log_syslog_emit(struct log_device *ldev, struct log_rec *rec)
{
int ret;
int fmt = gd->log_fmt;
char msg[BUFFER_SIZE];
char *msg_end = msg + BUFFER_SIZE;
char *ptr = msg;
char *iphdr;
char *log_msg;
int eth_hdr_size;
struct in_addr bcast_ip;
static int processing_msg;
unsigned int log_level;
char *log_hostname;
/* Fend off messages from the network stack while writing a message */
if (processing_msg)
return 0;
processing_msg = 1;
/* Setup packet buffers */
net_init();
/* Disable hardware and put it into the reset state */
eth_halt();
/* Set current device according to environment variables */
eth_set_current();
/* Get hardware ready for send and receive operations */
ret = eth_init();
if (ret < 0) {
eth_halt();
goto out;
}
memset(msg, 0, BUFFER_SIZE);
/* Set ethernet header */
eth_hdr_size = net_set_ether((uchar *)ptr, net_bcast_ethaddr, PROT_IP);
ptr += eth_hdr_size;
iphdr = ptr;
ptr += IP_UDP_HDR_SIZE;
log_msg = ptr;
/*
* The syslog log levels defined in RFC 5424 match the U-Boot ones up to
* level 7 (debug).
*/
log_level = rec->level;
if (log_level > 7)
log_level = 7;
/* Leave high bits as 0 to write a 'kernel message' */
/* Write log message to buffer */
append(&ptr, msg_end, "<%u>", log_level);
log_hostname = env_get("log_hostname");
if (log_hostname)
append(&ptr, msg_end, "%s ", log_hostname);
append(&ptr, msg_end, "uboot: ");
if (fmt & BIT(LOGF_LEVEL))
append(&ptr, msg_end, "%s.",
log_get_level_name(rec->level));
if (fmt & BIT(LOGF_CAT))
append(&ptr, msg_end, "%s,",
log_get_cat_name(rec->cat));
if (fmt & BIT(LOGF_FILE))
append(&ptr, msg_end, "%s:", rec->file);
if (fmt & BIT(LOGF_LINE))
append(&ptr, msg_end, "%d-", rec->line);
if (fmt & BIT(LOGF_FUNC))
append(&ptr, msg_end, "%s()", rec->func);
if (fmt & BIT(LOGF_MSG))
append(&ptr, msg_end, "%s%s",
fmt != BIT(LOGF_MSG) ? " " : "", rec->msg);
/* Consider trailing 0x00 */
ptr++;
debug("log message: '%s'\n", log_msg);
/* Broadcast message */
bcast_ip.s_addr = 0xFFFFFFFFL;
net_set_udp_header((uchar *)iphdr, bcast_ip, 514, 514, ptr - log_msg);
net_send_packet((uchar *)msg, ptr - msg);
out:
processing_msg = 0;
return ret;
}
LOG_DRIVER(syslog) = {
.name = "syslog",
.emit = log_syslog_emit,
};
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