diff options
Diffstat (limited to 'source3/libsmb/asn1.c')
| -rw-r--r-- | source3/libsmb/asn1.c | 44 |
1 files changed, 36 insertions, 8 deletions
diff --git a/source3/libsmb/asn1.c b/source3/libsmb/asn1.c index 5735f372ca..e4c2d3af80 100644 --- a/source3/libsmb/asn1.c +++ b/source3/libsmb/asn1.c @@ -21,17 +21,13 @@ #include "includes.h" +/* free an asn1 structure */ void asn1_free(ASN1_DATA *data) { - free(data->data); -} - -BOOL asn1_check_empty(ASN1_DATA *data) -{ - if (data->nesting) return False; - return True; + SAFE_FREE(data->data); } +/* write to the ASN1 buffer, advancing the buffer pointer */ BOOL asn1_write(ASN1_DATA *data, const void *p, int len) { if (data->length < data->ofs+len) { @@ -44,11 +40,13 @@ BOOL asn1_write(ASN1_DATA *data, const void *p, int len) return True; } +/* useful fn for writing a uint8 */ BOOL asn1_write_uint8(ASN1_DATA *data, uint8 v) { return asn1_write(data, &v, 1); } +/* push a tag onto the asn1 data buffer. Used for nested structures */ BOOL asn1_push_tag(ASN1_DATA *data, uint8 tag) { struct nesting *nesting; @@ -64,6 +62,7 @@ BOOL asn1_push_tag(ASN1_DATA *data, uint8 tag) return True; } +/* pop a tag */ BOOL asn1_pop_tag(ASN1_DATA *data) { struct nesting *nesting; @@ -75,6 +74,9 @@ BOOL asn1_pop_tag(ASN1_DATA *data) return False; } len = data->ofs - (nesting->start+1); + /* yes, this is ugly. We don't know in advance how many bytes the length + of a tag will take, so we assumed 1 byte. If we were wrong then we + need to correct our mistake */ if (len > 127) { data->data[nesting->start] = 0x82; asn1_write_uint8(data, 0); @@ -91,7 +93,7 @@ BOOL asn1_pop_tag(ASN1_DATA *data) return True; } - +/* write an object ID to a ASN1 buffer */ BOOL asn1_write_OID(ASN1_DATA *data, const char *OID) { unsigned v, v2; @@ -114,6 +116,7 @@ BOOL asn1_write_OID(ASN1_DATA *data, const char *OID) return True; } +/* write an octet string */ BOOL asn1_write_OctetString(ASN1_DATA *data, const void *p, size_t length) { asn1_push_tag(data, ASN1_OCTET_STRING); @@ -122,6 +125,7 @@ BOOL asn1_write_OctetString(ASN1_DATA *data, const void *p, size_t length) return True; } +/* write a general string */ BOOL asn1_write_GeneralString(ASN1_DATA *data, const char *s) { asn1_push_tag(data, ASN1_GENERAL_STRING); @@ -130,6 +134,7 @@ BOOL asn1_write_GeneralString(ASN1_DATA *data, const char *s) return True; } +/* write a BOOLEAN */ BOOL asn1_write_BOOLEAN(ASN1_DATA *data, BOOL v) { asn1_write_uint8(data, ASN1_BOOLEAN); @@ -137,3 +142,26 @@ BOOL asn1_write_BOOLEAN(ASN1_DATA *data, BOOL v) return True; } + +/* load a ASN1_DATA structure with a lump of data, ready to be parsed */ +BOOL asn1_load(ASN1_DATA *data, void *p, size_t length) +{ + ZERO_STRUCTP(data); + data->data = memdup(p, length); + if (!data->data) return False; + data->length = length; + return True; +} + +/* read from a ASN1 buffer, advancing the buffer pointer */ +BOOL asn1_read(ASN1_DATA *data, void *p, int len) +{ + if (data->ofs + len > data->length) { + return False; + } + memcpy(p, data->data + data->ofs, len); + data->ofs += len; + return True; +} + + |