320 lines
8.1 KiB
C
320 lines
8.1 KiB
C
/*
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* This file is part of Luma3DS.
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* Copyright (C) 2016-2019 Aurora Wright, TuxSH
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*
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* SPDX-License-Identifier: (MIT OR GPL-2.0-or-later)
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*/
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#include "gdb/net.h"
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#include <stdarg.h>
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#include <stdlib.h>
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#include "fmt.h"
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#include "minisoc.h"
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u8 GDB_ComputeChecksum(const char *packetData, size_t len)
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{
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unsigned long cksum = 0;
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for(size_t i = 0; i < len; i++) {
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cksum += packetData[i];
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}
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return (u8)cksum;
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}
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void GDB_EncodeHex(char *dst, const void *src, size_t len)
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{
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static const char *alphabet = "0123456789abcdef";
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const u8 *src8 = (const u8 *)src;
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for (size_t i = 0; i < len; i++) {
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dst[2 * i] = alphabet[(src8[i] & 0xf0) >> 4];
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dst[2 * i + 1] = alphabet[src8[i] & 0x0f];
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}
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}
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static inline u32 GDB_DecodeHexDigit(char src, bool *ok)
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{
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*ok = true;
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switch (src) {
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case '0' ... '9': return 0 + (src - '0');
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case 'a' ... 'f': return 10 + (src - 'a');
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case 'A' ... 'F': return 10 + (src - 'A');
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default:
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*ok = false;
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return 0;
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}
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}
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u32 GDB_DecodeHex(void *dst, const char *src, size_t len) {
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size_t i = 0;
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bool ok = true;
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u8 *dst8 = (u8 *)dst;
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for (i = 0; i < len && ok && src[2 * i] != 0 && src[2 * i + 1] != 0; i++) {
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dst8[i] = (GDB_DecodeHexDigit(src[2 * i], &ok) << 4) | GDB_DecodeHexDigit(src[2 * i + 1], &ok);
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}
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return (!ok) ? i - 1 : i;
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}
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u32 GDB_EscapeBinaryData(u32 *encodedCount, void *dst, const void *src, size_t len, size_t maxLen)
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{
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u8 *dst8 = (u8 *)dst;
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const u8 *src8 = (const u8 *)src;
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maxLen = maxLen >= len ? len : maxLen;
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while ((uintptr_t)dst8 < (uintptr_t)dst + maxLen) {
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if (*src8 == '$' || *src8 == '#' || *src8 == '}' || *src8 == '*') {
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if ((uintptr_t)dst8 + 1 >= (uintptr_t)dst + maxLen) {
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break;
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}
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*dst8++ = '}';
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*dst8++ = *src8++ ^ 0x20;
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}
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else {
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*dst8++ = *src8++;
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}
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}
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*encodedCount = dst8 - (u8 *)dst;
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return src8 - (u8 *)src;
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}
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u32 GDB_UnescapeBinaryData(void *dst, const void *src, size_t len)
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{
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u8 *dst8 = (u8 *)dst;
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const u8 *src8 = (const u8 *)src;
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while ((uintptr_t)src8 < (uintptr_t)src + len) {
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if (*src8 == '}') {
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src8++;
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*dst8++ = *src8++ ^ 0x20;
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} else {
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*dst8++ = *src8++;
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}
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}
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return dst8 - (u8 *)dst;
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}
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const char *GDB_ParseIntegerList(unsigned long *dst, const char *src, size_t nb, char sep, char lastSep, u32 base, bool allowPrefix)
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{
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const char *pos = src;
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const char *endpos;
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bool ok;
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for (size_t i = 0; i < nb; i++) {
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unsigned long n = xstrtoul(pos, (char **)&endpos, (int) base, allowPrefix, &ok);
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if(!ok || endpos == pos) {
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return NULL;
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}
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if (i != nb - 1) {
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if (*endpos != sep) {
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return NULL;
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}
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pos = endpos + 1;
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} else {
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if (*endpos != lastSep && *endpos != 0) {
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return NULL;
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}
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pos = endpos;
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}
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dst[i] = n;
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}
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return pos;
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}
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const char *GDB_ParseHexIntegerList(unsigned long *dst, const char *src, size_t nb, char lastSep)
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{
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return GDB_ParseIntegerList(dst, src, nb, ',', lastSep, 16, false);
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}
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int GDB_ReceivePacket(GDBContext *ctx)
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{
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char backupbuf[GDB_BUF_LEN + 4];
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memcpy(backupbuf, ctx->buffer, ctx->latestSentPacketSize);
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memset(ctx->buffer, 0, sizeof(ctx->buffer));
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int r = soc_recv(ctx->super.sockfd, ctx->buffer, sizeof(ctx->buffer), MSG_PEEK);
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if(r < 1)
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return -1;
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if(ctx->buffer[0] == '+') // GDB sometimes acknowleges TCP acknowledgment packets (yes...). IDA does it properly
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{
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if(ctx->flags & GDB_FLAG_NOACK)
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return -1;
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// Consume it
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r = soc_recv(ctx->super.sockfd, ctx->buffer, 1, 0);
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if(r != 1)
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return -1;
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ctx->buffer[0] = 0;
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r = soc_recv(ctx->super.sockfd, ctx->buffer, sizeof(ctx->buffer), MSG_PEEK);
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if(r == -1)
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goto packet_error;
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}
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else if(ctx->buffer[0] == '-')
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{
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soc_send(ctx->super.sockfd, backupbuf, ctx->latestSentPacketSize, 0);
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return 0;
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}
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int maxlen = r > (int)sizeof(ctx->buffer) ? (int)sizeof(ctx->buffer) : r;
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if(ctx->buffer[0] == '$') // normal packet
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{
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char *pos;
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for(pos = ctx->buffer; pos < ctx->buffer + maxlen && *pos != '#'; pos++);
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if(pos == ctx->buffer + maxlen) // malformed packet
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return -1;
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else
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{
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u8 checksum;
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r = soc_recv(ctx->super.sockfd, ctx->buffer, 3 + pos - ctx->buffer, 0);
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if(r != 3 + pos - ctx->buffer || GDB_DecodeHex(&checksum, pos + 1, 1) != 1)
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goto packet_error;
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else if(GDB_ComputeChecksum(ctx->buffer + 1, pos - ctx->buffer - 1) != checksum)
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goto packet_error;
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ctx->commandEnd = pos;
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*pos = 0; // replace trailing '#' by a NUL character
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}
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}
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else if(ctx->buffer[0] == '\x03')
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{
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r = soc_recv(ctx->super.sockfd, ctx->buffer, 1, 0);
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if(r != 1)
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goto packet_error;
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ctx->commandEnd = ctx->buffer;
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}
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if(!(ctx->flags & GDB_FLAG_NOACK))
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{
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int r2 = soc_send(ctx->super.sockfd, "+", 1, 0);
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if(r2 != 1)
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return -1;
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}
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if(ctx->noAckSent)
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{
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ctx->flags |= GDB_FLAG_NOACK;
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ctx->noAckSent = false;
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}
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return r;
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packet_error:
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if(!(ctx->flags & GDB_FLAG_NOACK))
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{
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r = soc_send(ctx->super.sockfd, "-", 1, 0);
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if(r != 1)
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return -1;
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else
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return 0;
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}
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else
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return -1;
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}
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static int GDB_DoSendPacket(GDBContext *ctx, size_t len)
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{
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int r = soc_send(ctx->super.sockfd, ctx->buffer, len, 0);
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if(r > 0)
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ctx->latestSentPacketSize = r;
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return r;
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}
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int GDB_SendPacket(GDBContext *ctx, const char *packetData, size_t len)
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{
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memmove(ctx->buffer + 1, packetData, len);
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ctx->buffer[0] = '$';
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char *checksumLoc = ctx->buffer + len + 1;
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*checksumLoc++ = '#';
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hexItoa(GDB_ComputeChecksum(ctx->buffer + 1, len), checksumLoc, 2, false);
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return GDB_DoSendPacket(ctx, 4 + len);
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}
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int GDB_SendFormattedPacket(GDBContext *ctx, const char *packetDataFmt, ...)
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{
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va_list args;
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va_start(args, packetDataFmt);
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int n = vsprintf(ctx->buffer + 1, packetDataFmt, args);
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va_end(args);
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if (n < 0) {
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return -1;
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}
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ctx->buffer[0] = '$';
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char *checksumLoc = ctx->buffer + n + 1;
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*checksumLoc++ = '#';
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hexItoa(GDB_ComputeChecksum(ctx->buffer + 1, n), checksumLoc, 2, false);
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return GDB_DoSendPacket(ctx, 4 + n);
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}
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int GDB_SendHexPacket(GDBContext *ctx, const void *packetData, size_t len)
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{
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if(4 + 2 * len > GDB_BUF_LEN)
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return -1;
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ctx->buffer[0] = '$';
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GDB_EncodeHex(ctx->buffer + 1, packetData, len);
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char *checksumLoc = ctx->buffer + 2 * len + 1;
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*checksumLoc++ = '#';
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hexItoa(GDB_ComputeChecksum(ctx->buffer + 1, 2 * len), checksumLoc, 2, false);
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return GDB_DoSendPacket(ctx, 4 + 2 * len);
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}
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int GDB_SendStreamData(GDBContext *ctx, const char *streamData, size_t offset, size_t length, size_t totalSize, bool forceEmptyLast)
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{
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// GDB_BUF_LEN does not include the usual %#<1-byte checksum>
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if(length > GDB_BUF_LEN - 1) {
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length = GDB_BUF_LEN - 1;
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}
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char letter;
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if ((forceEmptyLast && offset >= totalSize) || (!forceEmptyLast && offset + length >= totalSize)) {
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length = offset >= totalSize ? 0 : totalSize - offset;
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letter = 'l';
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} else {
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letter = 'm';
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}
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// Note: ctx->buffer[0] = '$'
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memmove(ctx->buffer + 2, streamData + offset, length);
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ctx->buffer[1] = letter;
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return GDB_SendPacket(ctx, ctx->buffer + 1, 1 + length);
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}
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int GDB_ReplyEmpty(GDBContext *ctx)
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{
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return GDB_SendPacket(ctx, "", 0);
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}
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int GDB_ReplyOk(GDBContext *ctx)
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{
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return GDB_SendPacket(ctx, "OK", 2);
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}
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int GDB_ReplyErrno(GDBContext *ctx, int no)
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{
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char buf[] = "E01";
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hexItoa((u8)no, buf + 1, 2, false);
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return GDB_SendPacket(ctx, buf, 3);
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}
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