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udhcpc: support option 0x79 (static routes) (part of bug 341)

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function                                             old     new   delta
xmalloc_optname_optval                                 -     583    +583
dhcp_option_strings                                  258     266      +8
dhcp_options                                          70      72      +2
len_of_option_as_string                               11      12      +1
dhcp_option_lengths                                   11      12      +1
udhcp_run_script                                    1187     669    -518
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 4/1 up/down: 595/-518)           Total: 77 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-07-03 18:14:03 +02:00
parent 7895b91743
commit 97ef65483a
3 changed files with 52 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
networking/udhcp/options.c
View File

@ -48,6 +48,7 @@ const struct dhcp_option dhcp_options[] = {
#if ENABLE_FEATURE_UDHCP_RFC3397
{ OPTION_STR1035 | OPTION_LIST , 0x77 }, /* search */
#endif
{ OPTION_STATIC_ROUTES , 0x79 }, /* DHCP_STATIC_ROUTES */
/* MSIE's "Web Proxy Autodiscovery Protocol" support */
{ OPTION_STRING , 0xfc }, /* wpad */
@ -97,6 +98,7 @@ const char dhcp_option_strings[] ALIGN1 =
#if ENABLE_FEATURE_UDHCP_RFC3397
"search" "\0"
#endif
"staticroutes" "\0" /* DHCP_STATIC_ROUTES */
/* MSIE's "Web Proxy Autodiscovery Protocol" support */
"wpad" "\0"
;
@ -116,6 +118,8 @@ const uint8_t dhcp_option_lengths[] ALIGN1 = {
[OPTION_S16] = 2,
[OPTION_U32] = 4,
[OPTION_S32] = 4,
/* Just like OPTION_STRING, we use minimum length here */
[OPTION_STATIC_ROUTES] = 5,
};

2
networking/udhcp/options.h
View File

@ -20,6 +20,7 @@ enum {
OPTION_S16,
OPTION_U32,
OPTION_S32,
OPTION_STATIC_ROUTES,
};
/* Client requests this option by default */
@ -68,6 +69,7 @@ enum {
#define DHCP_VENDOR 0x3c
#define DHCP_CLIENT_ID 0x3d
#define DHCP_FQDN 0x51
#define DHCP_STATIC_ROUTES 0x79
#define DHCP_END 0xFF
/* Offsets in option byte sequence */
#define OPT_CODE 0

47
networking/udhcp/script.c
View File

@ -17,6 +17,7 @@
static const uint8_t len_of_option_as_string[] = {
[OPTION_IP] = sizeof("255.255.255.255 "),
[OPTION_IP_PAIR] = sizeof("255.255.255.255 ") * 2,
[OPTION_STATIC_ROUTES]= sizeof("255.255.255.255/32 255.255.255.255 "),
[OPTION_STRING] = 1,
#if ENABLE_FEATURE_UDHCP_RFC3397
[OPTION_STR1035] = 1,
@ -51,7 +52,7 @@ static int mton(uint32_t mask)
/* Create "opt_name=opt_value" string */
static char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_option *type_p, const char *opt_name)
static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_option *type_p, const char *opt_name)
{
unsigned upper_length;
int len, type, optlen;
@ -106,6 +107,50 @@ static char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_option *t
memcpy(dest, option, len);
dest[len] = '\0';
return ret; /* Short circuit this case */
case OPTION_STATIC_ROUTES: {
/* Option binary format:
* mask [one byte, 0..32]
* ip [big endian, 0..4 bytes depending on mask]
* router [big endian, 4 bytes]
* may be repeated
*
* We convert it to a string "IP/MASK ROUTER IP2/MASK2 ROUTER2"
*/
const char *pfx = "";
while (len >= 1 + 4) { /* mask + 0-byte ip + router */
uint32_t nip;
uint8_t *p;
unsigned mask;
int bytes;
mask = *option++;
if (mask > 32)
break;
len--;
nip = 0;
p = (void*) &nip;
bytes = (mask + 7) / 8; /* 0 -> 0, 1..8 -> 1, 9..16 -> 2 etc */
while (--bytes >= 0) {
*p++ = *option++;
len--;
}
if (len < 4)
break;
/* print ip/mask */
dest += sprint_nip(dest, pfx, (void*) &nip);
pfx = " ";
dest += sprintf(dest, "/%u ", mask);
/* print router */
dest += sprint_nip(dest, "", option);
option += 4;
len -= 4;
}
return ret;
}
#if ENABLE_FEATURE_UDHCP_RFC3397
case OPTION_STR1035:
/* unpack option into dest; use ret for prefix (i.e., "optname=") */