emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

udhcp: add option scanner

Browse Source 
Added an option scanner to udhcp to enable iteration over packet options.

Signed-off-by: Martin Lewis <martin.lewis.x84@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Martin Lewis
2020-06-23 15:25:08 -05:00
committed by Denys Vlasenko
parent fc2ce04a38
commit acdc8eed89
2 changed files with 63 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
networking/udhcp/common.h
View File

@@ -107,6 +107,12 @@ enum {
OPTION_LIST = 0x20,
};
struct dhcp_scan_state {
int overload;
int rem;
uint8_t *optionptr;
};
/* DHCP option codes (partial list). See RFC 2132 and
* http://www.iana.org/assignments/bootp-dhcp-parameters/
* Commented out options are handled by common option machinery,
@@ -206,6 +212,8 @@ extern const uint8_t dhcp_option_lengths[] ALIGN1;
unsigned FAST_FUNC udhcp_option_idx(const char *name, const char *option_strings);
void init_scan_state(struct dhcp_packet *packet, struct dhcp_scan_state *scan_state) FAST_FUNC;
uint8_t *udhcp_scan_options(struct dhcp_packet *packet, struct dhcp_scan_state *scan_state) FAST_FUNC;
uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
/* Same as above + ensures that option length is 4 bytes
* (returns NULL if size is different)