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When the DHCP file/sname fields are empty, don't allow them to override 

their equivalent DHCP-option-specified values.
pull/1/head
Michael Brown 2008-01-07 13:50:32 +00:00
parent de29e5a39c
commit 3311169707
1 changed files with 8 additions and 6 deletions
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14
src/net/udp/dhcp.c
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@ -368,11 +368,11 @@ static size_t dhcp_field_len ( const void *data, size_t max_len ) {
* @v max_len Field length * @v max_len Field length
* @v tag DHCP option tag, or 0 * @v tag DHCP option tag, or 0
* *
* If @c tag is non-zero, the field will be treated as a * If @c tag is non-zero (and the field is not empty), the field will
* NUL-terminated string representing the value of the specified DHCP * be treated as a NUL-terminated string representing the value of the
* option. If @c tag is zero, the field will be treated as a block of * specified DHCP option. If @c tag is zero, the field will be
* DHCP options, and simply appended to the existing options in the * treated as a block of DHCP options, and simply appended to the
* option block. * existing options in the option block.
* *
* The caller must ensure that there is enough space in the options * The caller must ensure that there is enough space in the options
* block to perform the merge. * block to perform the merge.
@ -385,7 +385,9 @@ static void merge_dhcp_field ( struct dhcp_option_block *options,
struct dhcp_option *end; struct dhcp_option *end;
if ( tag ) { if ( tag ) {
set_dhcp_option ( options, tag, data, strlen ( data ) ); len = strlen ( data );
if ( len )
set_dhcp_option ( options, tag, data, len );
} else { } else {
len = dhcp_field_len ( data, max_len ); len = dhcp_field_len ( data, max_len );
dest = ( options->data + options->len - 1 ); dest = ( options->data + options->len - 1 );