diff options
Diffstat (limited to 'src/shared')
| -rw-r--r-- | src/shared/dns-domain.c | 34 | ||||
| -rw-r--r-- | src/shared/dns-domain.h | 2 |
2 files changed, 36 insertions, 0 deletions
diff --git a/src/shared/dns-domain.c b/src/shared/dns-domain.c index 7af15e0098..423ccca9cc 100644 --- a/src/shared/dns-domain.c +++ b/src/shared/dns-domain.c @@ -715,3 +715,37 @@ int dns_name_single_label(const char *name) { return r == 0 && *name == 0; } + +/* Encode a domain name according to RFC 1035 Section 3.1 */ +int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len) { + uint8_t *label_length; + uint8_t *out; + int r; + + assert_return(buffer, -EINVAL); + assert_return(domain, -EINVAL); + assert_return(domain[0], -EINVAL); + + out = buffer; + + do { + /* reserve a byte for label length */ + if (len == 0) + return -ENOBUFS; + len--; + label_length = out; + out++; + + /* convert and copy a single label */ + r = dns_label_unescape(&domain, (char *) out, len); + if (r < 0) + return r; + + /* fill label length, move forward */ + *label_length = r; + out += r; + len -= r; + } while (r != 0); + + return out - buffer; +} diff --git a/src/shared/dns-domain.h b/src/shared/dns-domain.h index 1f0d242c18..b214897440 100644 --- a/src/shared/dns-domain.h +++ b/src/shared/dns-domain.h @@ -67,3 +67,5 @@ int dns_name_address(const char *p, int *family, union in_addr_union *a); int dns_name_root(const char *name); int dns_name_single_label(const char *name); + +int dns_name_to_wire_format(const char *domain, uint8_t *buffer, size_t len); |