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dhcp: Set hostname for DISCOVER packets

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If the hostname is not set in the DISCOVER packet, then some servers might
issue an OFFER with hostname configured and consequently reject the REQUEST
with any other hostname.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Co-Authored-By: Simon Goldschmidt <goldsimon@gmx.de>
This commit is contained in:
Logan Gunthorpe 2019-11-18 16:58:04 -07:00 committed by Simon Goldschmidt
parent 5231c8da23
commit 90b2a6b4c4
2 changed files with 12 additions and 0 deletions
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4
src/core/ipv4/dhcp.c
View File

@ -1031,6 +1031,10 @@ dhcp_discover(struct netif *netif)
options_out_len = dhcp_option(options_out_len, msg_out->options, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
options_out_len = dhcp_option_short(options_out_len, msg_out->options, DHCP_MAX_MSG_LEN(netif));
#if LWIP_NETIF_HOSTNAME && LWIP_DHCP_DISCOVER_ADD_HOSTNAME
options_out_len = dhcp_option_hostname(options_out_len, msg_out->options, netif);
#endif /* LWIP NETIF HOSTNAME && LWIP_DHCP_DISCOVER_ADD_HOSTNAME */
options_out_len = dhcp_option(options_out_len, msg_out->options, DHCP_OPTION_PARAMETER_REQUEST_LIST, LWIP_ARRAYSIZE(dhcp_discover_request_options));
for (i = 0; i < LWIP_ARRAYSIZE(dhcp_discover_request_options); i++) {
options_out_len = dhcp_option_byte(options_out_len, msg_out->options, dhcp_discover_request_options[i]);

8
src/include/lwip/opt.h
View File

@ -966,6 +966,14 @@
#if !defined LWIP_DHCP_MAX_DNS_SERVERS || defined __DOXYGEN__
#define LWIP_DHCP_MAX_DNS_SERVERS DNS_MAX_SERVERS
#endif
/** LWIP_DHCP_DISCOVER_ADD_HOSTNAME: Set to 1 to include hostname opt in discover packets.
* If the hostname is not set in the DISCOVER packet, then some servers might issue an OFFER with hostname
* configured and consequently reject the REQUEST with any other hostname.
*/
#if !defined LWIP_DHCP_DISCOVER_ADD_HOSTNAME || defined __DOXYGEN__
#define LWIP_DHCP_DISCOVER_ADD_HOSTNAME 0
#endif /* LWIP_DHCP_DISCOVER_ADD_HOSTNAME */
/**
* @}
*/