blob: 698c585fa11eeff51656b6e9722583dda10c323c [file] [log] [blame]
Heinrich Schuchardtbefadde2020-02-26 21:48:16 +01001// 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>
Simon Glass90526e92020-05-10 11:39:56 -060010#include <net.h>
Heinrich Schuchardtbefadde2020-02-26 21:48:16 +010011
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 static int processing_msg;
39 unsigned int log_level;
40 char *log_hostname;
41
42 /* Fend off messages from the network stack while writing a message */
43 if (processing_msg)
44 return 0;
45
46 processing_msg = 1;
47
48 /* Setup packet buffers */
49 net_init();
50 /* Disable hardware and put it into the reset state */
51 eth_halt();
52 /* Set current device according to environment variables */
53 eth_set_current();
54 /* Get hardware ready for send and receive operations */
55 ret = eth_init();
56 if (ret < 0) {
57 eth_halt();
58 goto out;
59 }
60
61 memset(msg, 0, BUFFER_SIZE);
62
63 /* Set ethernet header */
64 eth_hdr_size = net_set_ether((uchar *)ptr, net_bcast_ethaddr, PROT_IP);
65 ptr += eth_hdr_size;
66 iphdr = ptr;
67 ptr += IP_UDP_HDR_SIZE;
68 log_msg = ptr;
69
70 /*
71 * The syslog log levels defined in RFC 5424 match the U-Boot ones up to
72 * level 7 (debug).
73 */
74 log_level = rec->level;
75 if (log_level > 7)
76 log_level = 7;
77 /* Leave high bits as 0 to write a 'kernel message' */
78
79 /* Write log message to buffer */
80 append(&ptr, msg_end, "<%u>", log_level);
81 log_hostname = env_get("log_hostname");
82 if (log_hostname)
83 append(&ptr, msg_end, "%s ", log_hostname);
84 append(&ptr, msg_end, "uboot: ");
85 if (fmt & (1 << LOGF_LEVEL))
86 append(&ptr, msg_end, "%s.",
87 log_get_level_name(rec->level));
88 if (fmt & (1 << LOGF_CAT))
89 append(&ptr, msg_end, "%s,",
90 log_get_cat_name(rec->cat));
91 if (fmt & (1 << LOGF_FILE))
92 append(&ptr, msg_end, "%s:", rec->file);
93 if (fmt & (1 << LOGF_LINE))
94 append(&ptr, msg_end, "%d-", rec->line);
95 if (fmt & (1 << LOGF_FUNC))
96 append(&ptr, msg_end, "%s()", rec->func);
97 if (fmt & (1 << LOGF_MSG))
98 append(&ptr, msg_end, "%s%s",
99 fmt != (1 << LOGF_MSG) ? " " : "", rec->msg);
100 /* Consider trailing 0x00 */
101 ptr++;
102
103 debug("log message: '%s'\n", log_msg);
104
105 /* Broadcast message */
106 bcast_ip.s_addr = 0xFFFFFFFFL;
107 net_set_udp_header((uchar *)iphdr, bcast_ip, 514, 514, ptr - log_msg);
108 net_send_packet((uchar *)msg, ptr - msg);
109
110out:
111 processing_msg = 0;
112 return ret;
113}
114
115LOG_DRIVER(syslog) = {
116 .name = "syslog",
117 .emit = log_syslog_emit,
118};