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https://github.com/logicog/RTLPlayground.git
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90 lines
3.8 KiB
C
90 lines
3.8 KiB
C
#include "machine.h"
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#include "syslog.h"
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#include "uip/uip.h"
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#include "rtl837x_common.h"
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#pragma codeseg BANK2
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#pragma constseg BANK2
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#define SYSLOG_O ((__xdata uint8_t *)&uip_buf[RTL_TAG_SIZE + VLAN_TAG_SIZE])
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__xdata char logbuf[LOGBUF_SIZE];
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__xdata uint16_t logptr_w = 0;
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__xdata uint16_t logptr_r = 0;
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__xdata uint8_t full_line_available = 0;
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__xdata uint8_t syslog_enabled = 0;
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__xdata uip_ipaddr_t syslog_addr;
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#define DEST_OFFSET (0)
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#define SOURCE_OFFSET (DEST_OFFSET + 6)
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#define ETHERTYPE_OFFSET (SOURCE_OFFSET + 6)
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#define IP_HEADER_OFFSET (ETHERTYPE_OFFSET + 2)
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#define UDP_HEADER_OFFSET (IP_HEADER_OFFSET + 20)
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#define UDP_PAYLOAD_OFFSET (UDP_HEADER_OFFSET + 8)
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void syslog_init(void) __banked
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{
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syslog_enabled = 0;
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logptr_w = 0;
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logptr_r = 0;
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full_line_available = 0;
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syslog_addr[0] = 0xffff; syslog_addr[1] = 0xffff; // Default to broadcast
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}
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void handle_syslog(void) __banked
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{
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if ((logptr_r != logptr_w) && full_line_available)
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{
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int16_t log_size = logptr_w - logptr_r;
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if (log_size < 0)
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log_size += LOGBUF_SIZE;
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if (log_size <= 4) {
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// Only some newline; not worth sending to syslog, skip it
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logptr_r = logptr_w;
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full_line_available = 0;
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return;
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}
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SYSLOG_O[DEST_OFFSET] = 255; SYSLOG_O[DEST_OFFSET + 1] = 255; SYSLOG_O[DEST_OFFSET + 2] = 255;
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SYSLOG_O[DEST_OFFSET + 3] = 255; SYSLOG_O[DEST_OFFSET + 4] = 255; SYSLOG_O[DEST_OFFSET + 5] = 255; // broadcast
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memcpy(SYSLOG_O + SOURCE_OFFSET, uip_ethaddr.addr, 6); // Source MAC address
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SYSLOG_O[ETHERTYPE_OFFSET] = 0x08; SYSLOG_O[ETHERTYPE_OFFSET + 1] = 0x00; // Ethertype: IPv4
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SYSLOG_O[IP_HEADER_OFFSET ] = 0x45; SYSLOG_O[IP_HEADER_OFFSET + 1] = 0x00; // IPv4, no options
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SYSLOG_O[IP_HEADER_OFFSET + 2] = (20+8+4+log_size) >> 8; SYSLOG_O[IP_HEADER_OFFSET + 3] = (20+8+4+log_size) & 0xff; // Total Length (IP header + UDP header + payload)
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SYSLOG_O[IP_HEADER_OFFSET + 4] = 0x00; SYSLOG_O[IP_HEADER_OFFSET + 5] = 0x00; // Identification
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SYSLOG_O[IP_HEADER_OFFSET + 6] = 0x00; SYSLOG_O[IP_HEADER_OFFSET + 7] = 0x00; // Flags, Fragment Offset
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SYSLOG_O[IP_HEADER_OFFSET + 8] = 0x40; SYSLOG_O[IP_HEADER_OFFSET + 9] = 0x11; // TTL, Protocol (UDP)
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SYSLOG_O[IP_HEADER_OFFSET + 10] = 0x00; SYSLOG_O[IP_HEADER_OFFSET + 11] = 0x00; // Header Checksum (not calculated)
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SYSLOG_O[IP_HEADER_OFFSET + 12] = uip_hostaddr[0] & 0xff; SYSLOG_O[IP_HEADER_OFFSET + 13] = uip_hostaddr[0] >> 8;
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SYSLOG_O[IP_HEADER_OFFSET + 14] = uip_hostaddr[1] & 0xff; SYSLOG_O[IP_HEADER_OFFSET + 15] = uip_hostaddr[1] >> 8; // Source IP
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SYSLOG_O[IP_HEADER_OFFSET + 16] = syslog_addr[0] & 0xff; SYSLOG_O[IP_HEADER_OFFSET + 17] = syslog_addr[0] >> 8;
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SYSLOG_O[IP_HEADER_OFFSET + 18] = syslog_addr[1] & 0xff; SYSLOG_O[IP_HEADER_OFFSET + 19] = syslog_addr[1] >> 8; // Destination IP
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SYSLOG_O[UDP_HEADER_OFFSET ] = 0x02; SYSLOG_O[UDP_HEADER_OFFSET + 1] = 0x02; // Source Port
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SYSLOG_O[UDP_HEADER_OFFSET + 2] = 0x02; SYSLOG_O[UDP_HEADER_OFFSET + 3] = 0x02; // Destination Port
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SYSLOG_O[UDP_HEADER_OFFSET + 4] = (8+4+log_size) >> 8; SYSLOG_O[UDP_HEADER_OFFSET + 5] = (8+4+log_size) & 0xff; // Length (UDP header + payload)
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SYSLOG_O[UDP_HEADER_OFFSET + 6] = 0x00; SYSLOG_O[UDP_HEADER_OFFSET + 7] = 0x00; // Header Checksum (not calculated)
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memcpyc(SYSLOG_O + UDP_PAYLOAD_OFFSET, "<14>", 4); // Syslog priority prefix
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if (logptr_w < logptr_r) {
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memcpy(SYSLOG_O + UDP_PAYLOAD_OFFSET + 4, logbuf + logptr_r, LOGBUF_SIZE - logptr_r);
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memcpy(SYSLOG_O + UDP_PAYLOAD_OFFSET + 4 + LOGBUF_SIZE - logptr_r, logbuf, logptr_w);
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} else {
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memcpy(SYSLOG_O + UDP_PAYLOAD_OFFSET + 4, logbuf + logptr_r, logptr_w - logptr_r);
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}
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// SYSLOG_O[UDP_PAYLOAD_OFFSET + 4 + log_size - 1] = 0; // Null-terminate the payload
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uip_len = UDP_PAYLOAD_OFFSET+4+log_size;
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tcpip_output();
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logptr_r += log_size;
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logptr_r &= (LOGBUF_SIZE - 1);
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full_line_available = 0;
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}
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}
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