[J-u-boot.git] / common / log_syslog.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Log to syslog.
 *
 * Copyright (c) 2020, Heinrich Schuchardt <[email protected]>
 */

#include <common.h>
#include <log.h>
#include <net.h>
#include <asm/global_data.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;
	unsigned int log_level;
	char *log_hostname;

	/* Setup packet buffers */
	ret = net_init();
	if (ret)
		return ret;
	/* 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:
	return ret;
}

LOG_DRIVER(syslog) = {
	.name	= "syslog",
	.emit	= log_syslog_emit,
};
Commit	Line	Data
befadde0 HS	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Log to syslog.
	4	*
	5	* Copyright (c) 2020, Heinrich Schuchardt <[email protected]>
	6	*/
	7
	8	#include <common.h>
	9	#include <log.h>
90526e9f	10	#include <net.h>
401d1c4f	11	#include <asm/global_data.h>
befadde0 HS	12
	13	DECLARE_GLOBAL_DATA_PTR;
	14
	15	#define BUFFER_SIZE 480
	16
	17	static void append(char *buf, char buf_end, const char *fmt, ...)
	18	{
	19	va_list args;
	20	size_t size = buf_end - *buf;
	21
	22	va_start(args, fmt);
	23	vsnprintf(*buf, size, fmt, args);
	24	va_end(args);
	25	buf += strlen(buf);
	26	}
	27
	28	static int log_syslog_emit(struct log_device ldev, struct log_rec rec)
	29	{
	30	int ret;
	31	int fmt = gd->log_fmt;
	32	char msg[BUFFER_SIZE];
	33	char *msg_end = msg + BUFFER_SIZE;
	34	char *ptr = msg;
	35	char *iphdr;
	36	char *log_msg;
	37	int eth_hdr_size;
	38	struct in_addr bcast_ip;
befadde0 HS	39	unsigned int log_level;
	40	char *log_hostname;
	41
befadde0	42	/* Setup packet buffers */
a4326612 SA	43	ret = net_init();
	44	if (ret)
	45	return ret;
befadde0 HS	46	/* Disable hardware and put it into the reset state */
	47	eth_halt();
	48	/* Set current device according to environment variables */
	49	eth_set_current();
	50	/* Get hardware ready for send and receive operations */
	51	ret = eth_init();
	52	if (ret < 0) {
	53	eth_halt();
	54	goto out;
	55	}
	56
	57	memset(msg, 0, BUFFER_SIZE);
	58
	59	/* Set ethernet header */
	60	eth_hdr_size = net_set_ether((uchar *)ptr, net_bcast_ethaddr, PROT_IP);
	61	ptr += eth_hdr_size;
	62	iphdr = ptr;
	63	ptr += IP_UDP_HDR_SIZE;
	64	log_msg = ptr;
	65
	66	/*
	67	* The syslog log levels defined in RFC 5424 match the U-Boot ones up to
	68	* level 7 (debug).
	69	*/
	70	log_level = rec->level;
	71	if (log_level > 7)
	72	log_level = 7;
	73	/* Leave high bits as 0 to write a 'kernel message' */
	74
	75	/* Write log message to buffer */
	76	append(&ptr, msg_end, "<%u>", log_level);
	77	log_hostname = env_get("log_hostname");
	78	if (log_hostname)
	79	append(&ptr, msg_end, "%s ", log_hostname);
	80	append(&ptr, msg_end, "uboot: ");
dde173a2	81	if (fmt & BIT(LOGF_LEVEL))
befadde0 HS	82	append(&ptr, msg_end, "%s.",
befadde0 HS	83	log_get_level_name(rec->level));
dde173a2	84	if (fmt & BIT(LOGF_CAT))
befadde0 HS	85	append(&ptr, msg_end, "%s,",
befadde0 HS	86	log_get_cat_name(rec->cat));
dde173a2	87	if (fmt & BIT(LOGF_FILE))
befadde0	88	append(&ptr, msg_end, "%s:", rec->file);
dde173a2	89	if (fmt & BIT(LOGF_LINE))
befadde0	90	append(&ptr, msg_end, "%d-", rec->line);
dde173a2	91	if (fmt & BIT(LOGF_FUNC))
befadde0	92	append(&ptr, msg_end, "%s()", rec->func);
dde173a2	93	if (fmt & BIT(LOGF_MSG))
befadde0	94	append(&ptr, msg_end, "%s%s",
dde173a2	95	fmt != BIT(LOGF_MSG) ? " " : "", rec->msg);
befadde0 HS	96	/* Consider trailing 0x00 */
	97	ptr++;
	98
	99	debug("log message: '%s'\n", log_msg);
	100
	101	/* Broadcast message */
	102	bcast_ip.s_addr = 0xFFFFFFFFL;
	103	net_set_udp_header((uchar *)iphdr, bcast_ip, 514, 514, ptr - log_msg);
	104	net_send_packet((uchar *)msg, ptr - msg);
	105
	106	out:
befadde0 HS	107	return ret;
	108	}
	109
	110	LOG_DRIVER(syslog) = {
	111	.name = "syslog",
	112	.emit = log_syslog_emit,
	113	};