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
13 DECLARE_GLOBAL_DATA_PTR;
14
15 #define BUFFER_SIZE 480
16
append(char ** buf,char * buf_end,const char * fmt,...)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
log_syslog_emit(struct log_device * ldev,struct log_rec * rec)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;
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
106 out:
107 return ret;
108 }
109
110 LOG_DRIVER(syslog) = {
111 .name = "syslog",
112 .emit = log_syslog_emit,
113 };
114