1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Log to syslog.
4 *
5 * Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
6 */
7
8#include <common.h>
9#include <log.h>
10#include <net.h>
11#include <asm/global_data.h>
12
13DECLARE_GLOBAL_DATA_PTR;
14
15#define BUFFER_SIZE 480
16
17static 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
28static 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;
39	unsigned int log_level;
40	char *log_hostname;
41
42	/* Setup packet buffers */
43	ret = net_init();
44	if (ret)
45		return ret;
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: ");
81	if (fmt & BIT(LOGF_LEVEL))
82		append(&ptr, msg_end, "%s.",
83		       log_get_level_name(rec->level));
84	if (fmt & BIT(LOGF_CAT))
85		append(&ptr, msg_end, "%s,",
86		       log_get_cat_name(rec->cat));
87	if (fmt & BIT(LOGF_FILE))
88		append(&ptr, msg_end, "%s:", rec->file);
89	if (fmt & BIT(LOGF_LINE))
90		append(&ptr, msg_end, "%d-", rec->line);
91	if (fmt & BIT(LOGF_FUNC))
92		append(&ptr, msg_end, "%s()", rec->func);
93	if (fmt & BIT(LOGF_MSG))
94		append(&ptr, msg_end, "%s%s",
95		       fmt != BIT(LOGF_MSG) ? " " : "", rec->msg);
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
106out:
107	return ret;
108}
109
110LOG_DRIVER(syslog) = {
111	.name	= "syslog",
112	.emit	= log_syslog_emit,
113};
114