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nuttx/libs/libc/netdb/Kconfig
Xiang Xiao 06619ac6fc lib/netdb: Change the default NETDB_DNSCLIENT_NAMESIZE to PATH_MAX 
Domain name has the similar layout as file path, so it's too small
to use 32 bytes as the default value, and better to has the same
default value as PATH_MAX which is 255.

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
2023-09-24 19:32:25 -04:00

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#
# For a description of the syntax of this configuration file,
# see the file kconfig-language.txt in the NuttX tools repository.
#
config LIBC_NETDB
bool "netdb support"
depends on NET_IPv4 || NET_IPv6
default n
menu "NETDB Support"
config LIBC_GAISTRERROR
bool "Enable gai_strerror"
depends on LIBC_NETDB
default n
---help---
The gai_strerror() function shall return a text string describing an error
value for the getaddrinfo() and getnameinfo(). But it can also require a lot
of memory. If this option is not selected, gai_strerror() will still exist in
the build but it will not decode error values.
config LIBC_GAISTRERROR_ERRNUM
bool "Print unknown error code in gai_strerror()"
default !LIBC_GAISTRERROR
---help---
If this option is selected, then gai_strerror() will print error code
for unknown errors like "Unknown error 11". Default enabled when
LIBC_GAISTRERROR is not selected.
config NETDB_BUFSIZE
int "gethostbyname/gethostbyaddr buffer size"
depends on LIBC_NETDB
default 256
config NETDB_MAX_IPADDR
int "Max number of IP addresses per host"
depends on LIBC_NETDB
default 2 if NET_IPv4 && NET_IPv6
default 1
---help---
This setting determines the maximum number of IP addresses
stored to the name resolution cache for a given host.
menuconfig NETDB_HOSTFILE
bool "Network host file support"
default n
select LIBC_NETDB
---help---
Enable network host table look ups via gethostbyname() and
gethostbyaddr().
if NETDB_HOSTFILE
config NETDB_HOSTCONF_PATH
string "Path to host configuration file"
default "/etc/hosts"
config NETDB_MAX_ALTNAMES
int "Max number of alternate host names"
default 4
endif # NETDB_HOSTFILE
menuconfig NETDB_DNSCLIENT
bool "DNS Name resolution"
default n
depends on NET && NET_UDP
select LIBC_NETDB
select NET_SOCKOPTS
---help---
Enable support for the name resolution; Enable network host
resolution via gethostbyname().
if NETDB_DNSCLIENT
config NETDB_DNSCLIENT_ENTRIES
int "Number of DNS resolver entries"
default 0 if DEFAULT_SMALL
default 8 if !DEFAULT_SMALL
range 0 255
---help---
Number of cached DNS resolver entries. Default: 8. Zero disables
all cached name resolutions.
Disabling the DNS cache means that each access call to
gethostbyname() will result in a new DNS network query. If
CONFIG_NETDB_DNSCLIENT_ENTRIES is non-zero, then entries will be
cached and if the name mapping can be found in that cache, the
network query can be avoid. Of course, this is only useful if you
query the same name often and if the IP address of the name is
stable. If the IP address can change, then caching DNS address
might have undesirable side-effects (see help for
CONFIG_NETDB_DNSCLIENT_LIFESEC).
config NETDB_DNSCLIENT_NAMESIZE
int "Max size of a cached hostname"
default PATH_MAX
---help---
The size of a hostname string in the DNS resolver cache is fixed.
This setting provides the maximum size of a hostname. Names longer
than this will be aliased! Default: 32
config NETDB_DNSCLIENT_LIFESEC
int "Life of a DNS cache entry (seconds)"
default 3600
---help---
Cached entries in the name resolution cache older than this will not
be used. Default: 1 hour. Zero means that entries will not expire.
Small values of CONFIG_NETDB_DNSCLIENT_LIFESEC may result in more
network DNS queries; larger values can make a host unreachable for
the entire duration of the timeout value. This might happen, for
example, if the remote host was assigned a different IP address by
a DHCP server.
config NETDB_DNSCLIENT_MAXRESPONSE
int "Max response size"
default 512
---help---
This setting determines the maximum size of response message that
can be received by the DNS resolver. The default used to be 96,
which might be enough if you have a control on the DNS servers.
It may need to be larger on enterprise networks.
config NETDB_DNSCLIENT_RECV_TIMEOUT
int "DNS receive timeout"
default 30
---help---
This is the timeout value when DNS receives response after
dns_send_query, unit: seconds
config NETDB_DNSCLIENT_SEND_TIMEOUT
int "DNS send timeout"
default NETDB_DNSCLIENT_RECV_TIMEOUT
---help---
This is the timeout value when DNS send request on dns_send_query,
unit: seconds
config NETDB_DNSCLIENT_RETRIES
int "Number of retries for DNS request"
default 3
---help---
This setting determines how many times resolver retries request
until failing.
config NETDB_RESOLVCONF
bool "DNS resolver file support"
default n
---help---
Enable DNS server look ups in resolver file like /etc/resolv.conf.
if NETDB_RESOLVCONF
config NETDB_RESOLVCONF_PATH
string "Path to host configuration file"
default "/etc/resolv.conf"
config NETDB_RESOLVCONF_NONSTDPORT
bool "Non-standard port support"
default n
---help---
By default, the resolv.conf file will hold only records like:
nameserver xx.xx.xx.xx
nameserver xxxx:::::::xxxx
The default port of 53 is always assumed.
If this option is selected, then OpenBSD style resolv.conf files
will be supported. This adds logic for a bracket port notation
like:
nameserver [xx.xx.xx.xx]:ppppp
nameserver [xxxx:::::::xxxx]:ppppp
endif # NETDB_RESOLVCONF
config NETDB_DNSSERVER_NAMESERVERS
int "Max number of configured nameservers"
default 1
depends on !NETDB_RESOLVCONF
---help---
This setting determines how many nameservers there can be
in use concurrently.
choice
prompt "DNS server address type"
default NETDB_DNSSERVER_IPv4 if NET_IPv4
default NETDB_DNSSERVER_IPv6 if !NET_IPv4 && NET_IPv6
default NETDB_DNSSERVER_NOADDR if !NET_IPv4 && !NET_IPv6
depends on !NETDB_RESOLVCONF
config NETDB_DNSSERVER_NOADDR
bool "No default DNS server address"
---help---
There is not default DNS nameserver address. Application must call
dns_add_nameserver() at runtime to add the DNS server address.
config NETDB_DNSSERVER_IPv4
bool "IPv4 DNS server address"
depends on NET_IPv4
---help---
An IPv4 default DNS nameserver address will be provided. Application
may overwrite this start default server address by calling
dns_add_nameserver() at runtime.
config NETDB_DNSSERVER_IPv6
bool "IPv6 DNS server address"
depends on NET_IPv6
---help---
An IPv6 default DNS nameserver address will be provided. Application
may overwrite this start default server address by calling
dns_add_nameserver() at runtime.
endchoice # DNS server address type
config NETDB_DNSSERVER_IPv4ADDR
hex "Target IPv4 address"
default 0x0a000001
depends on NETDB_DNSSERVER_IPv4
---help---
Default DNS server IPv4 address in host byte order. Default value
10.0.0.1. This may be changed via dns_add_nameserver().
if NETDB_DNSSERVER_IPv6
config NETDB_DNSSERVER_IPv6ADDR_1
hex "[0]"
default 0xfc00
range 0x0 0xffff
---help---
This is the default IP address of the DNS server. This is a 16-bit
integer value in host order. Each of the eight values forming the
full IPv6 address must be specified individually. This is the first
of the 8-values. The default for all eight values is fc00::1.
config NETDB_DNSSERVER_IPv6ADDR_2
hex "[1]"
default 0x0000
range 0x0 0xffff
---help---
This is the default IP address of the DNS server. This is a 16-bit
integer value in host order. Each of the eight values forming the
full IPv6 address must be specified individually. This is the second
of the 8-values. The default for all eight values is fc00::1.
config NETDB_DNSSERVER_IPv6ADDR_3
hex "[2]"
default 0x0000
range 0x0 0xffff
---help---
This is the default IP address of the DNS server. This is a 16-bit
integer value in host order. Each of the eight values forming the
full IPv6 address must be specified individually. This is the third
of the 8-values. The default for all eight values is fc00::1.
config NETDB_DNSSERVER_IPv6ADDR_4
hex "[3]"
default 0x0000
range 0x0 0xffff
---help---
This is the default IP address of the DNS server. This is a 16-bit
integer value in host order. Each of the eight values forming the
full IPv6 address must be specified individually. This is the fourth
of the 8-values. The default for all eight values is fc00::1.
config NETDB_DNSSERVER_IPv6ADDR_5
hex "[4]"
default 0x0000
range 0x0 0xffff
---help---
This is the default IP address of the DNS server. This is a 16-bit
integer value in host order. Each of the eight values forming the
full IPv6 address must be specified individually. This is the fifth
of the 8-values. The default for all eight values is fc00::1.
config NETDB_DNSSERVER_IPv6ADDR_6
hex "[5]"
default 0x0000
range 0x0 0xffff
---help---
This is the default IP address of the DNS server. This is a 16-bit
integer value in host order. Each of the eight values forming the
full IPv6 address must be specified individually. This is the sixth
of the 8-values. The default for all eight values is fc00::1.
config NETDB_DNSSERVER_IPv6ADDR_7
hex "[6]"
default 0x0000
range 0x0 0xffff
---help---
This is the default IP address of the DNS server. This is a 16-bit
integer value in host order. Each of the eight values forming the
full IPv6 address must be specified individually. This is the seventh
of the 8-values. The default for all eight values is fc00::1.
config NETDB_DNSSERVER_IPv6ADDR_8
hex "[7]"
default 0x0001
range 0x0 0xffff
---help---
This is the default IP address of the DNS server. This is a 16-bit
integer value in host order. Each of the eight values forming the
full IPv6 address must be specified individually. This is the last
of the 8-values. The default for all eight values is fc00::1.
endif # NETDB_DNSSERVER_IPv6
endif # NETDB_DNSCLIENT
endmenu # NETDB Support
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