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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/mphal.h"
#include "lib/netutils/netutils.h"
static uint32_t get_be16(const uint8_t *buf) {
return buf[0] << 8 | buf[1];
}
static uint32_t get_be32(const uint8_t *buf) {
return buf[0] << 24 | buf[1] << 16 | buf[2] << 8 | buf[3];
}
static void dump_hex_bytes(const mp_print_t *print, size_t len, const uint8_t *buf) {
for (size_t i = 0; i < len; ++i) {
mp_printf(print, " %02x", buf[i]);
}
}
static const char *ethertype_str(uint16_t type) {
// A value between 0x0000 - 0x05dc (inclusive) indicates a length, not type
switch (type) {
case 0x0800:
return "IPv4";
case 0x0806:
return "ARP";
case 0x86dd:
return "IPv6";
default:
return NULL;
}
}
void netutils_ethernet_trace(const mp_print_t *print, size_t len, const uint8_t *buf, unsigned int flags) {
mp_printf(print, "[% 8d] ETH%cX len=%u", mp_hal_ticks_ms(), flags & NETUTILS_TRACE_IS_TX ? 'T' : 'R', len);
mp_printf(print, " dst=%02x:%02x:%02x:%02x:%02x:%02x", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
mp_printf(print, " src=%02x:%02x:%02x:%02x:%02x:%02x", buf[6], buf[7], buf[8], buf[9], buf[10], buf[11]);
const char *ethertype = ethertype_str(buf[12] << 8 | buf[13]);
if (ethertype) {
mp_printf(print, " type=%s", ethertype);
} else {
mp_printf(print, " type=0x%04x", buf[12] << 8 | buf[13]);
}
if (len > 14) {
len -= 14;
buf += 14;
if (buf[-2] == 0x08 && buf[-1] == 0x00 && buf[0] == 0x45) {
// IPv4 packet
len = get_be16(buf + 2);
mp_printf(print, " srcip=%u.%u.%u.%u dstip=%u.%u.%u.%u",
buf[12], buf[13], buf[14], buf[15],
buf[16], buf[17], buf[18], buf[19]);
uint8_t prot = buf[9];
buf += 20;
len -= 20;
if (prot == 6) {
// TCP packet
uint16_t srcport = get_be16(buf);
uint16_t dstport = get_be16(buf + 2);
uint32_t seqnum = get_be32(buf + 4);
uint32_t acknum = get_be32(buf + 8);
uint16_t dataoff_flags = get_be16(buf + 12);
uint16_t winsz = get_be16(buf + 14);
mp_printf(print, " TCP srcport=%u dstport=%u seqnum=%u acknum=%u dataoff=%u flags=%x winsz=%u",
srcport, dstport, (unsigned)seqnum, (unsigned)acknum, dataoff_flags >> 12, dataoff_flags & 0x1ff, winsz);
buf += 20;
len -= 20;
if (dataoff_flags >> 12 > 5) {
mp_printf(print, " opts=");
size_t opts_len = ((dataoff_flags >> 12) - 5) * 4;
dump_hex_bytes(print, opts_len, buf);
buf += opts_len;
len -= opts_len;
}
} else if (prot == 17) {
// UDP packet
uint16_t srcport = get_be16(buf);
uint16_t dstport = get_be16(buf + 2);
mp_printf(print, " UDP srcport=%u dstport=%u", srcport, dstport);
len = get_be16(buf + 4);
buf += 8;
if ((srcport == 67 && dstport == 68) || (srcport == 68 && dstport == 67)) {
// DHCP
if (srcport == 67) {
mp_printf(print, " DHCPS");
} else {
mp_printf(print, " DHCPC");
}
dump_hex_bytes(print, 12 + 16 + 16 + 64, buf);
size_t n = 12 + 16 + 16 + 64 + 128;
len -= n;
buf += n;
mp_printf(print, " opts:");
switch (buf[6]) {
case 1:
mp_printf(print, " DISCOVER");
break;
case 2:
mp_printf(print, " OFFER");
break;
case 3:
mp_printf(print, " REQUEST");
break;
case 4:
mp_printf(print, " DECLINE");
break;
case 5:
mp_printf(print, " ACK");
break;
case 6:
mp_printf(print, " NACK");
break;
case 7:
mp_printf(print, " RELEASE");
break;
case 8:
mp_printf(print, " INFORM");
break;
}
}
} else {
// Non-UDP packet
mp_printf(print, " prot=%u", prot);
}
} else if (buf[-2] == 0x86 && buf[-1] == 0xdd && (buf[0] >> 4) == 6) {
// IPv6 packet
uint32_t h = get_be32(buf);
uint16_t l = get_be16(buf + 4);
mp_printf(print, " tclass=%u flow=%u len=%u nexthdr=%u hoplimit=%u", (unsigned)((h >> 20) & 0xff), (unsigned)(h & 0xfffff), l, buf[6], buf[7]);
mp_printf(print, " srcip=");
dump_hex_bytes(print, 16, buf + 8);
mp_printf(print, " dstip=");
dump_hex_bytes(print, 16, buf + 24);
buf += 40;
len -= 40;
}
if (flags & NETUTILS_TRACE_PAYLOAD) {
mp_printf(print, " data=");
dump_hex_bytes(print, len, buf);
}
}
if (flags & NETUTILS_TRACE_NEWLINE) {
mp_printf(print, "\n");
}
}
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