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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Log to syslog.
- *
- * Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
- */
- #include <common.h>
- #include <log.h>
- #include <net.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;
- static int processing_msg;
- unsigned int log_level;
- char *log_hostname;
- /* Fend off messages from the network stack while writing a message */
- if (processing_msg)
- return 0;
- processing_msg = 1;
- /* Setup packet buffers */
- net_init();
- /* 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:
- processing_msg = 0;
- return ret;
- }
- LOG_DRIVER(syslog) = {
- .name = "syslog",
- .emit = log_syslog_emit,
- };
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