From 81db9ef4425ed0d3397767f722b9f156b334867c Mon Sep 17 00:00:00 2001 From: Stefan Metzmacher Date: Thu, 24 Jun 2004 17:07:19 +0000 Subject: r1239: move the old msrpc_() functions to ndr__format_blob() simular to ndr__struct_blob() metze (This used to be commit b25dd341e0febd550a2936ca484b6fecce2ff8c2) --- source4/librpc/ndr/ndr_basic.c | 301 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 301 insertions(+) (limited to 'source4/librpc/ndr/ndr_basic.c') diff --git a/source4/librpc/ndr/ndr_basic.c b/source4/librpc/ndr/ndr_basic.c index 5d4ade096f..1adf6ea1d3 100644 --- a/source4/librpc/ndr/ndr_basic.c +++ b/source4/librpc/ndr/ndr_basic.c @@ -972,3 +972,304 @@ NTSTATUS ndr_pull_DATA_BLOB(struct ndr_pull *ndr, DATA_BLOB *blob) ndr->offset += length; return NT_STATUS_OK; } + +/* + this is a tiny ndr packet generator. This + generator is not general enough for all our rpc needs, its just + enough for the ntlmssp code + + format specifiers are: + + U = unicode string (input is unix string) + a = address (input is char *unix_string) + (1 byte type, 1 byte length, unicode/ASCII string, all inline) + A = ASCII string (input is unix string) + B = data blob (pointer + length) + b = data blob in header (pointer + length) + D + d = word (4 bytes) + C = constant ascii string + */ +NTSTATUS ndr_push_format_blob(DATA_BLOB *blob, TALLOC_CTX *mem_ctx, + const char *format, ...) +{ + int i, n; + va_list ap; + char *s; + uint8_t *b; + int head_size=0, data_size=0; + int head_ofs, data_ofs; + + /* first scan the format to work out the header and body size */ + va_start(ap, format); + for (i=0; format[i]; i++) { + switch (format[i]) { + case 'U': + s = va_arg(ap, char *); + head_size += 8; + data_size += str_charnum(s) * 2; + break; + case 'A': + s = va_arg(ap, char *); + head_size += 8; + data_size += str_ascii_charnum(s); + break; + case 'a': + n = va_arg(ap, int); + s = va_arg(ap, char *); + data_size += (str_charnum(s) * 2) + 4; + break; + case 'B': + b = va_arg(ap, uint8_t *); + head_size += 8; + data_size += va_arg(ap, int); + break; + case 'b': + b = va_arg(ap, uint8_t *); + head_size += va_arg(ap, int); + break; + case 'd': + n = va_arg(ap, int); + head_size += 4; + break; + case 'C': + s = va_arg(ap, char *); + head_size += str_charnum(s) + 1; + break; + } + } + va_end(ap); + + /* allocate the space, then scan the format again to fill in the values */ + *blob = data_blob_talloc(mem_ctx, NULL, head_size + data_size); + + if (blob->length != (head_size + data_size)) { + return NT_STATUS_NO_MEMORY; + } + + head_ofs = 0; + data_ofs = head_size; + + va_start(ap, format); + for (i=0; format[i]; i++) { + switch (format[i]) { + case 'U': + s = va_arg(ap, char *); + n = str_charnum(s); + SSVAL(blob->data, head_ofs, n*2); head_ofs += 2; + SSVAL(blob->data, head_ofs, n*2); head_ofs += 2; + SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4; + push_string(NULL, blob->data+data_ofs, s, n*2, STR_UNICODE|STR_NOALIGN); + data_ofs += n*2; + break; + case 'A': + s = va_arg(ap, char *); + n = str_ascii_charnum(s); + SSVAL(blob->data, head_ofs, n); head_ofs += 2; + SSVAL(blob->data, head_ofs, n); head_ofs += 2; + SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4; + push_string(NULL, blob->data+data_ofs, s, n, STR_ASCII|STR_NOALIGN); + data_ofs += n; + break; + case 'a': + n = va_arg(ap, int); + SSVAL(blob->data, data_ofs, n); data_ofs += 2; + s = va_arg(ap, char *); + n = str_charnum(s); + SSVAL(blob->data, data_ofs, n*2); data_ofs += 2; + if (0 < n) { + push_string(NULL, blob->data+data_ofs, s, n*2, + STR_UNICODE|STR_NOALIGN); + } + data_ofs += n*2; + break; + + case 'B': + b = va_arg(ap, uint8_t *); + n = va_arg(ap, int); + SSVAL(blob->data, head_ofs, n); head_ofs += 2; + SSVAL(blob->data, head_ofs, n); head_ofs += 2; + SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4; + if (n && b) /* don't follow null pointers... */ + memcpy(blob->data+data_ofs, b, n); + data_ofs += n; + break; + case 'd': + n = va_arg(ap, int); + SIVAL(blob->data, head_ofs, n); head_ofs += 4; + break; + case 'b': + b = va_arg(ap, uint8_t *); + n = va_arg(ap, int); + memcpy(blob->data + head_ofs, b, n); + head_ofs += n; + break; + case 'C': + s = va_arg(ap, char *); + head_ofs += push_string(NULL, blob->data+head_ofs, s, -1, + STR_ASCII|STR_TERMINATE); + break; + } + } + va_end(ap); + + return NT_STATUS_OK; +} + + +/* a helpful macro to avoid running over the end of our blob */ +#define NEED_DATA(amount) \ +if ((head_ofs + amount) > blob->length) { \ + return NT_STATUS_INVALID_PARAMETER; \ +} + +/* + this is a tiny msrpc packet parser. This the the partner of msrpc_gen + + format specifiers are: + + U = unicode string (output is unix string) + A = ascii string + B = data blob + b = data blob in header + d = word (4 bytes) + C = constant ascii string + */ + +NTSTATUS ndr_pull_format_blob(const DATA_BLOB *blob, TALLOC_CTX *mem_ctx, + const char *format, ...) +{ + int i; + va_list ap; + const char **ps, *s; + DATA_BLOB *b; + size_t head_ofs = 0; + uint16_t len1, len2; + uint32_t ptr; + uint32_t *v; + pstring p; + + va_start(ap, format); + for (i=0; format[i]; i++) { + switch (format[i]) { + case 'U': + NEED_DATA(8); + len1 = SVAL(blob->data, head_ofs); head_ofs += 2; + len2 = SVAL(blob->data, head_ofs); head_ofs += 2; + ptr = IVAL(blob->data, head_ofs); head_ofs += 4; + + ps = va_arg(ap, char **); + if (len1 == 0 && len2 == 0) { + *ps = ""; + } else { + /* make sure its in the right format - be strict */ + if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) { + return NT_STATUS_INVALID_PARAMETER; + } + if (len1 & 1) { + /* if odd length and unicode */ + return NT_STATUS_INVALID_PARAMETER; + } + if (blob->data + ptr < (uint8_t *)ptr || blob->data + ptr < blob->data) + return NT_STATUS_INVALID_PARAMETER; + + if (0 < len1) { + pull_string(NULL, p, blob->data + ptr, sizeof(p), + len1, + STR_UNICODE|STR_NOALIGN); + (*ps) = talloc_strdup(mem_ctx, p); + if (!(*ps)) { + return NT_STATUS_NO_MEMORY; + } + } else { + (*ps) = ""; + } + } + break; + case 'A': + NEED_DATA(8); + len1 = SVAL(blob->data, head_ofs); head_ofs += 2; + len2 = SVAL(blob->data, head_ofs); head_ofs += 2; + ptr = IVAL(blob->data, head_ofs); head_ofs += 4; + + ps = va_arg(ap, char **); + /* make sure its in the right format - be strict */ + if (len1 == 0 && len2 == 0) { + *ps = ""; + } else { + if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) { + return NT_STATUS_INVALID_PARAMETER; + } + + if (blob->data + ptr < (uint8_t *)ptr || blob->data + ptr < blob->data) + return NT_STATUS_INVALID_PARAMETER; + + if (0 < len1) { + pull_string(NULL, p, blob->data + ptr, sizeof(p), + len1, + STR_ASCII|STR_NOALIGN); + (*ps) = talloc_strdup(mem_ctx, p); + if (!(*ps)) { + return NT_STATUS_NO_MEMORY; + } + } else { + (*ps) = ""; + } + } + break; + case 'B': + NEED_DATA(8); + len1 = SVAL(blob->data, head_ofs); head_ofs += 2; + len2 = SVAL(blob->data, head_ofs); head_ofs += 2; + ptr = IVAL(blob->data, head_ofs); head_ofs += 4; + + b = (DATA_BLOB *)va_arg(ap, void *); + if (len1 == 0 && len2 == 0) { + *b = data_blob_talloc(mem_ctx, NULL, 0); + } else { + /* make sure its in the right format - be strict */ + if ((len1 != len2) || (ptr + len1 < ptr) || (ptr + len1 < len1) || (ptr + len1 > blob->length)) { + return NT_STATUS_INVALID_PARAMETER; + } + + if (blob->data + ptr < (uint8_t *)ptr || blob->data + ptr < blob->data) + return NT_STATUS_INVALID_PARAMETER; + + *b = data_blob_talloc(mem_ctx, blob->data + ptr, len1); + } + break; + case 'b': + b = (DATA_BLOB *)va_arg(ap, void *); + len1 = va_arg(ap, uint_t); + /* make sure its in the right format - be strict */ + NEED_DATA(len1); + if (blob->data + head_ofs < (uint8_t *)head_ofs || blob->data + head_ofs < blob->data) + return NT_STATUS_INVALID_PARAMETER; + + *b = data_blob_talloc(mem_ctx, blob->data + head_ofs, len1); + head_ofs += len1; + break; + case 'd': + v = va_arg(ap, uint32_t *); + NEED_DATA(4); + *v = IVAL(blob->data, head_ofs); head_ofs += 4; + break; + case 'C': + s = va_arg(ap, char *); + + if (blob->data + head_ofs < (uint8_t *)head_ofs || blob->data + head_ofs < blob->data) + return NT_STATUS_INVALID_PARAMETER; + + head_ofs += pull_string(NULL, p, blob->data+head_ofs, sizeof(p), + blob->length - head_ofs, + STR_ASCII|STR_TERMINATE); + if (strcmp(s, p) != 0) { + return NT_STATUS_INVALID_PARAMETER; + } + break; + } + } + va_end(ap); + + return NT_STATUS_OK; +} -- cgit