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-rw-r--r--networking/udhcp/d6_common.h3
-rw-r--r--networking/udhcp/d6_dhcpc.c104
2 files changed, 59 insertions, 48 deletions
diff --git a/networking/udhcp/d6_common.h b/networking/udhcp/d6_common.h
index fcec8c1..ca57883 100644
--- a/networking/udhcp/d6_common.h
+++ b/networking/udhcp/d6_common.h
@@ -89,6 +89,9 @@ struct d6_option {
#define D6_OPT_CLIENT_FQDN 39
+#define D6_OPT_TZ_POSIX 41
+#define D6_OPT_TZ_NAME 42
+
/*** Other shared functions ***/
struct client6_data_t {
diff --git a/networking/udhcp/d6_dhcpc.c b/networking/udhcp/d6_dhcpc.c
index 18a104c..08a26fb 100644
--- a/networking/udhcp/d6_dhcpc.c
+++ b/networking/udhcp/d6_dhcpc.c
@@ -93,7 +93,7 @@ static const char opt_req[] = {
0, 6,
(D6_OPT_DNS_SERVERS >> 8), (D6_OPT_DNS_SERVERS & 0xff),
(D6_OPT_DOMAIN_LIST >> 8), (D6_OPT_DOMAIN_LIST & 0xff),
- (D6_OPT_CLIENT_FQDN >> 8), (D6_OPT_CLIENT_FQDN & 0xff)
+ (D6_OPT_CLIENT_FQDN >> 8), (D6_OPT_CLIENT_FQDN & 0xff),
};
static const char opt_fqdn_req[] = {
@@ -136,12 +136,6 @@ static void *d6_copy_option(uint8_t *option, uint8_t *option_end, unsigned code)
return xmemdup(opt, opt[3] + 4);
}
-static void *d6_store_blob(void *dst, const void *src, unsigned len)
-{
- memcpy(dst, src, len);
- return dst + len;
-}
-
/*** Script execution code ***/
@@ -154,10 +148,10 @@ static char** new_env(void)
/* put all the parameters into the environment */
static void option_to_env(uint8_t *option, uint8_t *option_end)
{
- char *dlist, *ptr;
+ char *dlist;
/* "length minus 4" */
int len_m4 = option_end - option - 4;
- int olen, ooff;
+ int addrs, option_offset;
while (len_m4 >= 0) {
uint32_t v32;
char ipv6str[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")];
@@ -165,6 +159,10 @@ static void option_to_env(uint8_t *option, uint8_t *option_end)
if (option[0] != 0 || option[2] != 0)
break;
+ /* Check if option-length exceeds size of option */
+ if (option[3] > len_m4)
+ break;
+
switch (option[1]) {
//case D6_OPT_CLIENTID:
//case D6_OPT_SERVERID:
@@ -174,7 +172,7 @@ static void option_to_env(uint8_t *option, uint8_t *option_end)
break;
//case D6_OPT_IA_TA:
case D6_OPT_IAADDR:
-/* 0 1 2 3
+/* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | OPTION_IAADDR | option-len |
@@ -236,22 +234,25 @@ static void option_to_env(uint8_t *option, uint8_t *option_end)
*new_env() = xasprintf("ipv6prefix=%s/%u", ipv6str, (unsigned)(option[4 + 4]));
break;
case D6_OPT_DNS_SERVERS:
- olen = ((option[2] << 8) | option[3]) / 16;
- dlist = ptr = malloc (4 + olen * 40 - 1);
-
- memcpy (ptr, "dns=", 4);
- ptr += 4;
- ooff = 0;
-
- while (olen--) {
- sprint_nip6(ptr, option + 4 + ooff);
- ptr += 39;
- ooff += 16;
- if (olen)
- *ptr++ = ' ';
- }
+ /* Make sure payload-size is a multiple of 16 */
+ if ((option[3] & 0x0f) != 0)
+ break;
- *new_env() = dlist;
+ /* Get the number of addresses on the option */
+ addrs = option[3] >> 4;
+
+ /* Setup environment variable */
+ *new_env() = dlist = xmalloc(4 + addrs * 40 - 1);
+ dlist = stpcpy(dlist, "dns=");
+ option_offset = 0;
+
+ while (addrs--) {
+ sprint_nip6(dlist, option + 4 + option_offset);
+ dlist += 39;
+ option_offset += 16;
+ if (addrs)
+ *dlist++ = ' ';
+ }
break;
case D6_OPT_DOMAIN_LIST:
@@ -261,24 +262,31 @@ static void option_to_env(uint8_t *option, uint8_t *option_end)
*new_env() = dlist;
break;
case D6_OPT_CLIENT_FQDN:
- // Work around broken ISC DHCPD6
+ if (option[3] == 0)
+ break;
+ /* Work around broken ISC DHCPD6.
+ * ISC DHCPD6 does not implement RFC 4704 correctly: It says the first
+ * byte of option-payload should contain flags where the bits 7-3 are
+ * reserved for future use and MUST be zero. Instead ISC DHCPD6 just
+ * writes the entire FQDN as string to option-payload. We assume a
+ * broken server here if any of the reserved bits are set.
+ */
if (option[4] & 0xf8) {
- olen = ((option[2] << 8) | option[3]);
- dlist = xmalloc(olen);
-//fixme:
-//- explain
-//- add len error check
-//- merge two allocs into one
- memcpy(dlist, option + 4, olen);
- *new_env() = xasprintf("fqdn=%s", dlist);
- free(dlist);
+ *new_env() = xasprintf("fqdn=%.*s", (int)option[3], (char*)option + 4);
break;
}
- dlist = dname_dec(option + 5, ((option[2] << 8) | option[3]) - 1, "fqdn=");
+ dlist = dname_dec(option + 5, (/*(option[2] << 8) |*/ option[3]) - 1, "fqdn=");
if (!dlist)
break;
*new_env() = dlist;
break;
+ /* RFC 4833 Timezones */
+ case D6_OPT_TZ_POSIX:
+ *new_env() = xasprintf("tz=%.*s", (int)option[3], (char*)option + 4);
+ break;
+ case D6_OPT_TZ_NAME:
+ *new_env() = xasprintf("tz_name=%.*s", (int)option[3], (char*)option + 4);
+ break;
}
len_m4 -= 4 + option[3];
option += 4 + option[3];
@@ -346,7 +354,7 @@ static uint8_t *init_d6_packet(struct d6_packet *packet, char type, uint32_t xid
packet->d6_msg_type = type;
clientid = (void*)client_config.clientid;
- return d6_store_blob(packet->d6_options, clientid, clientid->len + 2+2);
+ return mempcpy(packet->d6_options, clientid, clientid->len + 2+2);
}
static uint8_t *add_d6_client_options(uint8_t *ptr)
@@ -483,11 +491,11 @@ static NOINLINE int send_d6_discover(uint32_t xid, struct in6_addr *requested_ip
iaaddr->len = 16+4+4;
memcpy(iaaddr->data, requested_ipv6, 16);
}
- opt_ptr = d6_store_blob(opt_ptr, client6_data.ia_na, len);
+ opt_ptr = mempcpy(opt_ptr, client6_data.ia_na, len);
/* Request additional options */
- opt_ptr = d6_store_blob(opt_ptr, &opt_req, sizeof(opt_req));
- opt_ptr = d6_store_blob(opt_ptr, &opt_fqdn_req, sizeof(opt_fqdn_req));
+ opt_ptr = mempcpy(opt_ptr, &opt_req, sizeof(opt_req));
+ opt_ptr = mempcpy(opt_ptr, &opt_fqdn_req, sizeof(opt_fqdn_req));
/* Add options:
* "param req" option according to -O, options specified with -x
@@ -538,13 +546,13 @@ static NOINLINE int send_d6_select(uint32_t xid)
opt_ptr = init_d6_packet(&packet, D6_MSG_REQUEST, xid);
/* server id */
- opt_ptr = d6_store_blob(opt_ptr, client6_data.server_id, client6_data.server_id->len + 2+2);
+ opt_ptr = mempcpy(opt_ptr, client6_data.server_id, client6_data.server_id->len + 2+2);
/* IA NA (contains requested IP) */
- opt_ptr = d6_store_blob(opt_ptr, client6_data.ia_na, client6_data.ia_na->len + 2+2);
+ opt_ptr = mempcpy(opt_ptr, client6_data.ia_na, client6_data.ia_na->len + 2+2);
/* Request additional options */
- opt_ptr = d6_store_blob(opt_ptr, &opt_req, sizeof(opt_req));
- opt_ptr = d6_store_blob(opt_ptr, &opt_fqdn_req, sizeof(opt_fqdn_req));
+ opt_ptr = mempcpy(opt_ptr, &opt_req, sizeof(opt_req));
+ opt_ptr = mempcpy(opt_ptr, &opt_fqdn_req, sizeof(opt_fqdn_req));
/* Add options:
* "param req" option according to -O, options specified with -x
@@ -611,9 +619,9 @@ static NOINLINE int send_d6_renew(uint32_t xid, struct in6_addr *server_ipv6, st
opt_ptr = init_d6_packet(&packet, DHCPREQUEST, xid);
/* server id */
- opt_ptr = d6_store_blob(opt_ptr, client6_data.server_id, client6_data.server_id->len + 2+2);
+ opt_ptr = mempcpy(opt_ptr, client6_data.server_id, client6_data.server_id->len + 2+2);
/* IA NA (contains requested IP) */
- opt_ptr = d6_store_blob(opt_ptr, client6_data.ia_na, client6_data.ia_na->len + 2+2);
+ opt_ptr = mempcpy(opt_ptr, client6_data.ia_na, client6_data.ia_na->len + 2+2);
/* Add options:
* "param req" option according to -O, options specified with -x
@@ -640,9 +648,9 @@ static int send_d6_release(struct in6_addr *server_ipv6, struct in6_addr *our_cu
/* Fill in: msg type, client id */
opt_ptr = init_d6_packet(&packet, D6_MSG_RELEASE, random_xid());
/* server id */
- opt_ptr = d6_store_blob(opt_ptr, client6_data.server_id, client6_data.server_id->len + 2+2);
+ opt_ptr = mempcpy(opt_ptr, client6_data.server_id, client6_data.server_id->len + 2+2);
/* IA NA (contains our current IP) */
- opt_ptr = d6_store_blob(opt_ptr, client6_data.ia_na, client6_data.ia_na->len + 2+2);
+ opt_ptr = mempcpy(opt_ptr, client6_data.ia_na, client6_data.ia_na->len + 2+2);
bb_error_msg("sending %s", "release");
return d6_send_kernel_packet(
generated by cgit v1.1 at 2024-12-27 10:09:23 +0000