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udhcpc: check that 4-byte options are indeed 4-byte, closes 11506

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function                                             old     new   delta
udhcp_get_option32                                     -      27     +27
udhcp_get_option                                     231     248     +17
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(add/remove: 1/0 grow/shrink: 1/0 up/down: 44/0)               Total: 44 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2018-12-17 18:07:18 +01:00
parent 4b72aebe80
commit 6d3b4bb24d
4 changed files with 29 additions and 6 deletions
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4
networking/udhcp/common.h
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@ -205,6 +205,10 @@ extern const uint8_t dhcp_option_lengths[] ALIGN1;
unsigned FAST_FUNC udhcp_option_idx(const char *name, const char *option_strings);
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)
*/
uint8_t *udhcp_get_option32(struct dhcp_packet *packet, int code) FAST_FUNC;
int udhcp_end_option(uint8_t *optionptr) FAST_FUNC;
void udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt) FAST_FUNC;
#if ENABLE_UDHCPC || ENABLE_UDHCPD