[PATCH 6/6] udhcpc6: Set -x options in request

Samuel Mendoza-Jonas sam at mendozajonas.com
Tue May 8 06:30:25 UTC 2018


Signed-off-by: Samuel Mendoza-Jonas <sam at mendozajonas.com>
---
 networking/udhcp/common.c   | 19 +++++++++++++++----
 networking/udhcp/common.h   |  4 ++++
 networking/udhcp/d6_dhcpc.c | 10 +++++++++-
 3 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
index 2fdec1d55..771c3df75 100644
--- a/networking/udhcp/common.c
+++ b/networking/udhcp/common.c
@@ -411,10 +411,21 @@ static NOINLINE void attach_option(
 		/* make a new option */
 		log2("attaching option %02x to list", optflag->code);
 		new = xmalloc(sizeof(*new));
-		new->data = xmalloc(length + OPT_DATA);
-		new->data[OPT_CODE] = optflag->code;
-		new->data[OPT_LEN] = length;
-		memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer), length);
+		if (addr_type == CLIENT_CONFIG_DHCPV6) {
+			new->data = xmalloc(length + D6_OPT_DATA);
+			new->data[D6_OPT_CODE] = optflag->code >> 8;
+			new->data[D6_OPT_CODE + 1] = optflag->code & 0xff;
+			new->data[D6_OPT_LEN] = length >> 8;
+			new->data[D6_OPT_LEN + 1] = length & 0xff;
+			memcpy(new->data + D6_OPT_DATA, (allocated ? allocated : buffer),
+					length);
+		} else {
+			new->data = xmalloc(length + OPT_DATA);
+			new->data[OPT_CODE] = optflag->code;
+			new->data[OPT_LEN] = length;
+			memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer),
+					length);
+		}
 
 		curr = opt_list;
 		while (*curr && (*curr)->data[OPT_CODE] < optflag->code)
diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index e8c3dc2af..15499197c 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -164,6 +164,10 @@ enum {
 #define OPT_CODE                0
 #define OPT_LEN                 1
 #define OPT_DATA                2
+/* Offsets in option byte sequence for DHCPv6 */
+#define D6_OPT_CODE				0
+#define D6_OPT_LEN				2
+#define D6_OPT_DATA				4
 /* Bits in "overload" option */
 #define OPTION_FIELD            0
 #define FILE_FIELD              1
diff --git a/networking/udhcp/d6_dhcpc.c b/networking/udhcp/d6_dhcpc.c
index 0b6c4b28a..f021cd1c2 100644
--- a/networking/udhcp/d6_dhcpc.c
+++ b/networking/udhcp/d6_dhcpc.c
@@ -486,8 +486,11 @@ static uint8_t *init_d6_packet(struct d6_packet *packet, char type, uint32_t xid
 
 static uint8_t *add_d6_client_options(uint8_t *ptr)
 {
+	struct option_set *curr;
 	uint8_t *start = ptr;
 	unsigned option;
+	uint16_t len;
+
 
 	ptr += 4;
 	for (option = 1; option < 256; option++) {
@@ -510,7 +513,12 @@ static uint8_t *add_d6_client_options(uint8_t *ptr)
 	ptr = mempcpy(ptr, &opt_fqdn_req, sizeof(opt_fqdn_req));
 #endif
 	/* Add -x options if any */
-	//...
+	curr = client_config.options;
+	while (curr) {
+		len = curr->data[D6_OPT_LEN] << 8 | (curr->data[D6_OPT_LEN + 1] & 0xff);
+		ptr = mempcpy(ptr, curr->data, D6_OPT_DATA + len);
+		curr = curr->next;
+	}
 
 	return ptr;
 }
-- 
2.17.0



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