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