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addrinfo.jl
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addrinfo.jl
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# This file is a part of Julia. License is MIT: https://julialang.org/license
"""
DNSError
The type of exception thrown when an error occurs in DNS lookup.
The `host` field indicates the host URL string.
The `code` field indicates the error code based on libuv.
"""
struct DNSError <: Exception
host::String
code::Int32
end
function show(io::IO, err::DNSError)
print(io, "DNSError: ", err.host, ", ", Base.struverror(err.code),
" (", Base.uverrorname(err.code), ")")
end
function uv_getaddrinfocb(req::Ptr{Cvoid}, status::Cint, addrinfo::Ptr{Cvoid})
data = uv_req_data(req)
if data != C_NULL
t = unsafe_pointer_to_objref(data)::Task
uv_req_set_data(req, C_NULL)
if status != 0 || addrinfo == C_NULL
schedule(t, _UVError("getaddrinfo", status))
else
freeaddrinfo = addrinfo
addrs = IPAddr[]
while addrinfo != C_NULL
sockaddr = ccall(:jl_sockaddr_from_addrinfo, Ptr{Cvoid}, (Ptr{Cvoid},), addrinfo)
if ccall(:jl_sockaddr_is_ip4, Int32, (Ptr{Cvoid},), sockaddr) == 1
ip4addr = ccall(:jl_sockaddr_host4, UInt32, (Ptr{Cvoid},), sockaddr)
push!(addrs, IPv4(ntoh(ip4addr)))
elseif ccall(:jl_sockaddr_is_ip6, Int32, (Ptr{Cvoid},), sockaddr) == 1
ip6addr = Ref{UInt128}()
scope_id = ccall(:jl_sockaddr_host6, UInt32, (Ptr{Cvoid}, Ptr{UInt128}), sockaddr, ip6addr)
push!(addrs, IPv6(ntoh(ip6addr[])))
end
addrinfo = ccall(:jl_next_from_addrinfo, Ptr{Cvoid}, (Ptr{Cvoid},), addrinfo)
end
ccall(:uv_freeaddrinfo, Cvoid, (Ptr{Cvoid},), freeaddrinfo)
schedule(t, addrs)
end
else
# no owner for this req, safe to just free it
Libc.free(req)
end
nothing
end
"""
getalladdrinfo(host::AbstractString) -> Vector{IPAddr}
Gets all of the IP addresses of the `host`.
Uses the operating system's underlying `getaddrinfo` implementation, which may do a DNS lookup.
# Example
```julia-repl
julia> getalladdrinfo("google.com")
2-element Array{IPAddr,1}:
ip"172.217.6.174"
ip"2607:f8b0:4000:804::200e"
```
"""
function getalladdrinfo(host::String)
req = Libc.malloc(Base._sizeof_uv_getaddrinfo)
uv_req_set_data(req, C_NULL) # in case we get interrupted before arriving at the wait call
iolock_begin()
status = ccall(:jl_getaddrinfo, Int32, (Ptr{Cvoid}, Ptr{Cvoid}, Cstring, Ptr{Cvoid}, Ptr{Cvoid}),
eventloop(), req, host, #=service=#C_NULL,
@cfunction(uv_getaddrinfocb, Cvoid, (Ptr{Cvoid}, Cint, Ptr{Cvoid})))
if status < 0
Libc.free(req)
if status == UV_EINVAL
throw(ArgumentError("Invalid getaddrinfo argument"))
elseif status == UV_ENOMEM || status == UV_ENOBUFS
throw(OutOfMemoryError())
end
uv_error("getaddrinfo", status)
end
ct = current_task()
preserve_handle(ct)
Base.sigatomic_begin()
uv_req_set_data(req, ct)
iolock_end()
r = try
Base.sigatomic_end()
wait()
finally
Base.sigatomic_end()
iolock_begin()
ct.queue === nothing || list_deletefirst!(ct.queue, ct)
if uv_req_data(req) != C_NULL
# req is still alive,
# so make sure we don't get spurious notifications later
uv_req_set_data(req, C_NULL)
ccall(:uv_cancel, Int32, (Ptr{Cvoid},), req) # try to let libuv know we don't care anymore
else
# done with req
Libc.free(req)
end
iolock_end()
unpreserve_handle(ct)
end
if isa(r, IOError)
code = r.code
if code in (UV_EAI_ADDRFAMILY, UV_EAI_AGAIN, UV_EAI_BADFLAGS,
UV_EAI_BADHINTS, UV_EAI_CANCELED, UV_EAI_FAIL,
UV_EAI_FAMILY, UV_EAI_NODATA, UV_EAI_NONAME,
UV_EAI_OVERFLOW, UV_EAI_PROTOCOL, UV_EAI_SERVICE,
UV_EAI_SOCKTYPE)
throw(DNSError(host, code))
elseif code == UV_EAI_MEMORY
throw(OutOfMemoryError())
else
throw(r)
end
end
return r::Vector{IPAddr}
end
getalladdrinfo(host::AbstractString) = getalladdrinfo(String(host))
"""
getaddrinfo(host::AbstractString, IPAddr=IPv4) -> IPAddr
Gets the first IP address of the `host` of the specified `IPAddr` type.
Uses the operating system's underlying getaddrinfo implementation, which may do a DNS lookup.
"""
function getaddrinfo(host::String, T::Type{<:IPAddr})
addrs = getalladdrinfo(host)
for addr in addrs
if addr isa T
return addr
end
end
throw(DNSError(host, UV_EAI_NONAME))
end
getaddrinfo(host::AbstractString, T::Type{<:IPAddr}) = getaddrinfo(String(host), T)
function getaddrinfo(host::AbstractString)
addrs = getalladdrinfo(String(host))
if !isempty(addrs)
return addrs[begin]::Union{IPv4,IPv6}
end
throw(DNSError(host, UV_EAI_NONAME))
end
function uv_getnameinfocb(req::Ptr{Cvoid}, status::Cint, hostname::Cstring, service::Cstring)
data = uv_req_data(req)
if data != C_NULL
t = unsafe_pointer_to_objref(data)::Task
uv_req_set_data(req, C_NULL)
if status != 0
schedule(t, _UVError("getnameinfo", status))
else
schedule(t, unsafe_string(hostname))
end
else
# no owner for this req, safe to just free it
Libc.free(req)
end
nothing
end
"""
getnameinfo(host::IPAddr) -> String
Performs a reverse-lookup for IP address to return a hostname and service
using the operating system's underlying `getnameinfo` implementation.
# Examples
```julia-repl
julia> getnameinfo(IPv4("8.8.8.8"))
"google-public-dns-a.google.com"
```
"""
function getnameinfo(address::Union{IPv4, IPv6})
req = Libc.malloc(Base._sizeof_uv_getnameinfo)
uv_req_set_data(req, C_NULL) # in case we get interrupted before arriving at the wait call
port = hton(UInt16(0))
flags = 0
uvcb = @cfunction(uv_getnameinfocb, Cvoid, (Ptr{Cvoid}, Cint, Cstring, Cstring))
status = UV_EINVAL
host_in = Ref(hton(address.host))
iolock_begin()
status = ccall(:jl_getnameinfo, Int32, (Ptr{Cvoid}, Ptr{Cvoid}, Ptr{Cvoid}, UInt16, Cint, Ptr{Cvoid}, Cint),
eventloop(), req, host_in, port, flags, uvcb, address isa IPv6)
if status < 0
Libc.free(req)
if status == UV_EINVAL
throw(ArgumentError("Invalid getnameinfo argument"))
elseif status == UV_ENOMEM || status == UV_ENOBUFS
throw(OutOfMemoryError())
end
uv_error("getnameinfo", status)
end
ct = current_task()
preserve_handle(ct)
Base.sigatomic_begin()
uv_req_set_data(req, ct)
iolock_end()
r = try
Base.sigatomic_end()
wait()
finally
Base.sigatomic_end()
iolock_begin()
ct.queue === nothing || list_deletefirst!(ct.queue, ct)
if uv_req_data(req) != C_NULL
# req is still alive,
# so make sure we don't get spurious notifications later
uv_req_set_data(req, C_NULL)
ccall(:uv_cancel, Int32, (Ptr{Cvoid},), req) # try to let libuv know we don't care anymore
else
# done with req
Libc.free(req)
end
iolock_end()
unpreserve_handle(ct)
end
if isa(r, IOError)
code = r.code
if code in (UV_EAI_ADDRFAMILY, UV_EAI_AGAIN, UV_EAI_BADFLAGS,
UV_EAI_BADHINTS, UV_EAI_CANCELED, UV_EAI_FAIL,
UV_EAI_FAMILY, UV_EAI_NODATA, UV_EAI_NONAME,
UV_EAI_OVERFLOW, UV_EAI_PROTOCOL, UV_EAI_SERVICE,
UV_EAI_SOCKTYPE)
throw(DNSError(repr(address), code))
elseif code == UV_EAI_MEMORY
throw(OutOfMemoryError())
else
throw(r)
end
end
return r::String
end
const _sizeof_uv_interface_address = ccall(:jl_uv_sizeof_interface_address,Int32,())
"""
getipaddr() -> IPAddr
Get an IP address of the local machine, preferring IPv4 over IPv6. Throws if no
addresses are available.
getipaddr(addr_type::Type{T}) where T<:IPAddr -> T
Get an IP address of the local machine of the specified type. Throws if no
addresses of the specified type are available.
This function is a backwards-compatibility wrapper around [`getipaddrs`](@ref).
New applications should use [`getipaddrs`](@ref) instead.
# Examples
```julia-repl
julia> getipaddr()
ip"192.168.1.28"
julia> getipaddr(IPv6)
ip"fe80::9731:35af:e1c5:6e49"
```
See also [`getipaddrs`](@ref).
"""
function getipaddr(addr_type::Type{T}) where T<:IPAddr
addrs = getipaddrs(addr_type)
if length(addrs) == 0
error("No networking interface available")
end
# Prefer the first IPv4 address
i = something(findfirst(ip -> ip isa IPv4, addrs), 1)
return addrs[i]
end
getipaddr() = getipaddr(IPv4)
"""
getipaddrs(addr_type::Type{T}=IPAddr; loopback::Bool=false) where T<:IPAddr -> Vector{T}
Get the IP addresses of the local machine.
Setting the optional `addr_type` parameter to `IPv4` or `IPv6` causes only addresses of that type to be returned.
The `loopback` keyword argument dictates whether loopback addresses (e.g. `ip"127.0.0.1"`, `ip"::1"`) are included.
!!! compat "Julia 1.2"
This function is available as of Julia 1.2.
# Examples
```julia-repl
julia> getipaddrs()
5-element Array{IPAddr,1}:
ip"198.51.100.17"
ip"203.0.113.2"
ip"2001:db8:8:4:445e:5fff:fe5d:5500"
ip"2001:db8:8:4:c164:402e:7e3c:3668"
ip"fe80::445e:5fff:fe5d:5500"
julia> getipaddrs(IPv6)
3-element Array{IPv6,1}:
ip"2001:db8:8:4:445e:5fff:fe5d:5500"
ip"2001:db8:8:4:c164:402e:7e3c:3668"
ip"fe80::445e:5fff:fe5d:5500"
```
See also [`islinklocaladdr`](@ref).
"""
function getipaddrs(addr_type::Type{T}=IPAddr; loopback::Bool=false) where T<:IPAddr
addresses = T[]
addr_ref = Ref{Ptr{UInt8}}(C_NULL)
count_ref = Ref{Int32}(1)
lo_present = false
err = ccall(:jl_uv_interface_addresses, Int32, (Ref{Ptr{UInt8}}, Ref{Int32}), addr_ref, count_ref)
uv_error("getlocalip", err)
addr, count = addr_ref[], count_ref[]
for i = 0:(count-1)
current_addr = addr + i*_sizeof_uv_interface_address
if 1 == ccall(:jl_uv_interface_address_is_internal, Int32, (Ptr{UInt8},), current_addr)
lo_present = true
if !loopback
continue
end
end
sockaddr = ccall(:jl_uv_interface_address_sockaddr, Ptr{Cvoid}, (Ptr{UInt8},), current_addr)
if IPv4 <: T && ccall(:jl_sockaddr_is_ip4, Int32, (Ptr{Cvoid},), sockaddr) == 1
push!(addresses, IPv4(ntoh(ccall(:jl_sockaddr_host4, UInt32, (Ptr{Cvoid},), sockaddr))))
elseif IPv6 <: T && ccall(:jl_sockaddr_is_ip6, Int32, (Ptr{Cvoid},), sockaddr) == 1
addr6 = Ref{UInt128}()
scope_id = ccall(:jl_sockaddr_host6, UInt32, (Ptr{Cvoid}, Ref{UInt128},), sockaddr, addr6)
push!(addresses, IPv6(ntoh(addr6[])))
end
end
ccall(:uv_free_interface_addresses, Cvoid, (Ptr{UInt8}, Int32), addr, count)
return addresses
end
"""
islinklocaladdr(addr::IPAddr)
Tests if an IP address is a link-local address. Link-local addresses
are not guaranteed to be unique beyond their network segment,
therefore routers do not forward them. Link-local addresses are from
the address blocks `169.254.0.0/16` or `fe80::/10`.
# Example
```julia
filter(!islinklocaladdr, getipaddrs())
```
"""
function islinklocaladdr(addr::IPv4)
# RFC 3927
return (addr.host &
0xFFFF0000) ==
0xA9FE0000
end
function islinklocaladdr(addr::IPv6)
# RFC 4291
return (addr.host &
0xFFC00000000000000000000000000000) ==
0xFE800000000000000000000000000000
end