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url,src: simplify ipv6 logic by using uv_inet_pton #38842

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url,src: simplify ipv6 logic by using uv_inet_pton #38842

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125 changes: 17 additions & 108 deletions src/node_url.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -797,119 +797,28 @@ bool ToASCII(const std::string& input, std::string* output) {
}
#endif

#define NS_IN6ADDRSZ 16

void URLHost::ParseIPv6Host(const char* input, size_t length) {
CHECK_EQ(type_, HostType::H_FAILED);
unsigned size = arraysize(value_.ipv6);
for (unsigned n = 0; n < size; n++)
value_.ipv6[n] = 0;
uint16_t* piece_pointer = &value_.ipv6[0];
uint16_t* const buffer_end = piece_pointer + size;
uint16_t* compress_pointer = nullptr;
const char* pointer = input;
const char* end = pointer + length;
unsigned value, len, numbers_seen;
char ch = pointer < end ? pointer[0] : kEOL;
if (ch == ':') {
if (length < 2 || pointer[1] != ':')
return;
pointer += 2;
ch = pointer < end ? pointer[0] : kEOL;
piece_pointer++;
compress_pointer = piece_pointer;
}
while (ch != kEOL) {
if (piece_pointer >= buffer_end)
return;
if (ch == ':') {
if (compress_pointer != nullptr)
return;
pointer++;
ch = pointer < end ? pointer[0] : kEOL;
piece_pointer++;
compress_pointer = piece_pointer;
continue;
}
value = 0;
len = 0;
while (len < 4 && IsASCIIHexDigit(ch)) {
value = value * 0x10 + hex2bin(ch);
pointer++;
ch = pointer < end ? pointer[0] : kEOL;
len++;
}
switch (ch) {
case '.':
if (len == 0)
return;
pointer -= len;
ch = pointer < end ? pointer[0] : kEOL;
if (piece_pointer > buffer_end - 2)
return;
numbers_seen = 0;
while (ch != kEOL) {
value = 0xffffffff;
if (numbers_seen > 0) {
if (ch == '.' && numbers_seen < 4) {
pointer++;
ch = pointer < end ? pointer[0] : kEOL;
} else {
return;
}
}
if (!IsASCIIDigit(ch))
return;
while (IsASCIIDigit(ch)) {
unsigned number = ch - '0';
if (value == 0xffffffff) {
value = number;
} else if (value == 0) {
return;
} else {
value = value * 10 + number;
}
if (value > 255)
return;
pointer++;
ch = pointer < end ? pointer[0] : kEOL;
}
*piece_pointer = *piece_pointer * 0x100 + value;
numbers_seen++;
if (numbers_seen == 2 || numbers_seen == 4)
piece_pointer++;
}
if (numbers_seen != 4)
return;
continue;
case ':':
pointer++;
ch = pointer < end ? pointer[0] : kEOL;
if (ch == kEOL)
return;
break;
case kEOL:
break;
default:
return;
}
*piece_pointer = value;
piece_pointer++;
}

if (compress_pointer != nullptr) {
int64_t swaps = piece_pointer - compress_pointer;
piece_pointer = buffer_end - 1;
while (piece_pointer != &value_.ipv6[0] && swaps > 0) {
uint16_t temp = *piece_pointer;
uint16_t* swap_piece = compress_pointer + swaps - 1;
*piece_pointer = *swap_piece;
*swap_piece = temp;
piece_pointer--;
swaps--;
}
} else if (compress_pointer == nullptr &&
piece_pointer != buffer_end) {
unsigned char buf[sizeof(struct in6_addr)];
MaybeStackBuffer<char> ipv6(length + 1);
*(*ipv6 + length) = 0;
memset(buf, 0, sizeof(buf));
memcpy(*ipv6, input, sizeof(const char) * length);

int ret = uv_inet_pton(AF_INET6, *ipv6, buf);
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In theory I'm +1 but we need to make sure that uv_inet_pton matches what the url standard expects here. The reason for the more complicated implementation is that it's what the standard spec specifically calls out.

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@XadillaX XadillaX May 31, 2021 •
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  1. It passes wpt;
  2. uv_inet_ntop and inet_ntop breaks URLHost::ToString() because it does not match web standard ...:x.x.x.x. So I do not modify logic by using *_ntop.


if (ret != 0) {
return;
}

// Ref: https://sourceware.org/git/?p=glibc.git;a=blob;f=resolv/inet_ntop.c;h=c4d38c0f951013e51a4fc6eaa8a9b82e146abe5a;hb=HEAD#l119
for (int i = 0; i < NS_IN6ADDRSZ; i += 2) {
value_.ipv6[i >> 1] = (buf[i] << 8) | buf[i + 1];
}

type_ = HostType::H_IPV6;
}

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