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Add --dhcp-option-pxe config.

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This acts almost exactly like --dhcp-option except that the defined option
is only sent when replying to PXE clients. More importantly, these
options are sent in reply PXE clients when dnsmasq in acting in PXE
proxy mode. In PXE proxy mode, the set of options sent is defined by
the PXE standard and the normal set of options is not sent. This config
allows arbitrary options in PXE-proxy replies. A typical use-case is
to send option 175 to iPXE. Thanks to Jason Berry for finding the
requirement for this.
This commit is contained in:
Simon Kelley
2024-12-05 17:07:40 +00:00
parent 5a1f2c577d
commit 7199531ff1
8 changed files with 126 additions and 49 deletions
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4
src/dnsmasq.h
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@@ -958,6 +958,7 @@ struct dhcp_opt {
#define DHOPT_TAGOK 4096
#define DHOPT_ADDR6 8192
#define DHOPT_VENDOR_PXE 16384
#define DHOPT_PXE_OPT 32768
struct dhcp_boot {
char *file, *sname, *tftp_sname;
@@ -1782,8 +1783,9 @@ int do_snoop_script_run(void);
void dhcp_common_init(void);
ssize_t recv_dhcp_packet(int fd, struct msghdr *msg);
struct dhcp_netid *run_tag_if(struct dhcp_netid *tags);
int pxe_ok(struct dhcp_opt *opt, int pxemode);
struct dhcp_netid *option_filter(struct dhcp_netid *tags, struct dhcp_netid *context_tags,
struct dhcp_opt *opts);
struct dhcp_opt *opts, int pxemode);
int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool, int tagnotneeded);
char *strip_hostname(char *hostname);
void log_tags(struct dhcp_netid *netid, u32 xid);