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wireaddr: allow for UpperCase DNS names

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This further relaxes the DNS hostname checks to allow for uppercase
input.

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This commit is contained in:
Michael Schmoock 2022-12-07 11:04:35 +01:00 committed by Christian Decker
parent f0dd701bc5
commit 0ae6f4d6fb
2 changed files with 15 additions and 13 deletions
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3
common/test/run-ip_port_parsing.c
View File

@ -128,8 +128,9 @@ int main(int argc, char *argv[])
assert(is_dnsaddr("is-valid.3hostname123.com"));
assert(is_dnsaddr("just-a-hostname-with-dashes"));
assert(is_dnsaddr("lightningd_dest.underscore.allowed.in.hostname.part.com"));
assert(is_dnsaddr("UpperCase.valiD.COM"));
assert(is_dnsaddr("punycode.xn--bcher-kva.valid.com"));
assert(!is_dnsaddr("UPPERCASE.invalid.com"));
assert(!is_dnsaddr("nonpunycode.bücher.invalid.com"));
assert(!is_dnsaddr("-.invalid.com"));
assert(!is_dnsaddr("invalid.-example.com"));
assert(!is_dnsaddr("invalid.example-.com"));

25
common/wireaddr.c
View File

@ -378,21 +378,20 @@ bool is_wildcardaddr(const char *arg)
/* The rules to check for DNS FQDNs, see `man 7 hostname`
*
* - not longer than 255
* - segments are separated with . dot
* - segments do not start or end with - hyphen
* - segments must be longer than zero
* - allow lowercase a-z and digits 0-9 and - hyphen
* - additionall we allow for an '_' underscore in the hostname part.
* - labels are separated with . dot
* - labels do not start or end with - hyphen
* - labels must be longer than zero
* - allow ASCII letters a-z, A-Z, digits 0-9 and - hyphen
* - additionally we allow for an '_' underscore in the first hostname label
* - other characters must be punycoded rfc3492
*
* See issue #5657
* https://github.com/ElementsProject/lightning/issues/5657
* https://en.wikipedia.org/wiki/Hostname
* See `man 7 hostname` and https://www.rfc-editor.org/rfc/rfc1035
*/
bool is_dnsaddr(const char *arg)
{
size_t i, arglen;
int lastdot;
int numdot;
int numlabels;
if (is_ipaddr(arg) || is_toraddr(arg) || is_wildcardaddr(arg))
return false;
@ -402,10 +401,10 @@ bool is_dnsaddr(const char *arg)
if (arglen > 255)
return false;
lastdot = -1;
numdot = 0;
numlabels = 0;
for (i = 0; i < arglen; i++) {
if (arg[i] == '.') {
numdot++;
numlabels++;
/* segment must be longer than zero */
if (i - lastdot == 1)
return false;
@ -420,12 +419,14 @@ bool is_dnsaddr(const char *arg)
return false;
if (arg[i] >= 'a' && arg[i] <= 'z')
continue;
if (arg[i] >= 'A' && arg[i] <= 'Z')
continue;
if (arg[i] >= '0' && arg[i] <= '9')
continue;
if (arg[i] == '-')
continue;
/* allow for _ underscores in the first hostname part */
if (arg[i] == '_' && numdot == 0)
if (arg[i] == '_' && numlabels == 0)
continue;
return false;
}