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udhcpc6: rudimentary code to export data to script; fix IAADDR parsing

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2011-11-16 20:17:12 +01:00
parent 39b233182c
commit a092a89d8f
5 changed files with 132 additions and 41 deletions
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128
networking/udhcp/d6_dhcpc.c
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@@ -129,32 +129,114 @@ static void *d6_store_blob(void *dst, const void *src, unsigned len)
/*** Script execution code ***/
/* put all the parameters into the environment */
static char **fill_envp(struct d6_packet *packet
UNUSED_PARAM
)
static char** new_env(void)
{
client6_data.env_ptr = xrealloc_vector(client6_data.env_ptr, 3, client6_data.env_idx);
return &client6_data.env_ptr[client6_data.env_idx++];
}
/* put all the parameters into the environment */
static void option_to_env(uint8_t *option, uint8_t *option_end)
{
/* "length minus 4" */
int len_m4 = option_end - option - 4;
while (len_m4 >= 0) {
uint32_t v32;
char ipv6str[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff")];
if (option[0] != 0 || option[2] != 0)
break;
switch (option[1]) {
//case D6_OPT_CLIENTID:
//case D6_OPT_SERVERID:
case D6_OPT_IA_NA:
case D6_OPT_IA_PD:
option_to_env(option + 16, option + 4 + option[3]);
break;
//case D6_OPT_IA_TA:
case D6_OPT_IAADDR:
/* 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 |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* | IPv6 address |
* | |
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | preferred-lifetime |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | valid-lifetime |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
sprint_nip6(ipv6str, option + 4);
*new_env() = xasprintf("ipv6=%s", ipv6str);
move_from_unaligned32(v32, option + 4 + 16 + 4);
*new_env() = xasprintf("lease=%u", (unsigned)v32);
break;
//case D6_OPT_ORO:
//case D6_OPT_PREFERENCE:
//case D6_OPT_ELAPSED_TIME:
//case D6_OPT_RELAY_MSG:
//case D6_OPT_AUTH:
//case D6_OPT_UNICAST:
//case D6_OPT_STATUS_CODE:
//case D6_OPT_RAPID_COMMIT:
//case D6_OPT_USER_CLASS:
//case D6_OPT_VENDOR_CLASS:
//case D6_OPT_VENDOR_OPTS:
//case D6_OPT_INTERFACE_ID:
//case D6_OPT_RECONF_MSG:
//case D6_OPT_RECONF_ACCEPT:
case D6_OPT_IAPREFIX:
/* 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_IAPREFIX | option-length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | preferred-lifetime |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | valid-lifetime |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | prefix-length | |
* +-+-+-+-+-+-+-+-+ IPv6 prefix |
* | (16 octets) |
* | |
* | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* +-+-+-+-+-+-+-+-+
*/
//move_from_unaligned32(v32, option + 4 + 4);
//*new_env() = xasprintf("lease=%u", (unsigned)v32);
sprint_nip6(ipv6str, option + 4 + 4 + 1);
*new_env() = xasprintf("ipv6prefix=%s/%u", ipv6str, (unsigned)(option[4 + 4]));
}
option += 4 + option[3];
len_m4 -= 4 + option[3];
}
}
static char **fill_envp(struct d6_packet *packet)
{
int envc;
char **envp, **curr;
#define BITMAP unsigned
#define BBITS (sizeof(BITMAP) * 8)
#define BMASK(i) (1 << (i & (sizeof(BITMAP) * 8 - 1)))
#define FOUND_OPTS(i) (found_opts[(unsigned)i / BBITS])
///BITMAP found_opts[256 / BBITS];
client6_data.env_ptr = NULL;
client6_data.env_idx = 0;
///memset(found_opts, 0, sizeof(found_opts));
*new_env() = xasprintf("interface=%s", client_config.interface);
/* We need 2 elements for:
* "interface=IFACE"
* terminating NULL
*/
envc = 2;
if (packet)
option_to_env(packet->d6_options, packet->d6_options + sizeof(packet->d6_options));
curr = envp = xzalloc(sizeof(envp[0]) * envc);
*curr = xasprintf("interface=%s", client_config.interface);
putenv(*curr++);
envp = curr = client6_data.env_ptr;
while (*curr)
putenv(*curr++);
return envp;
}
@@ -1329,19 +1411,19 @@ int udhcpc6_main(int argc UNUSED_PARAM, char **argv)
free(client6_data.ia_na);
client6_data.ia_na = d6_copy_option(packet.d6_options, packet_end, D6_OPT_IA_NA);
if (!client6_data.ia_na) {
bb_error_msg("no lease time, ignoring packet");
bb_error_msg("no %s option, ignoring packet", "IA_NA");
continue;
}
if (client6_data.ia_na->len < (4 + 4 + 4) + (2 + 2 + 16 + 4 + 4)) {
bb_error_msg("IA_NA option is too short:%d bytes", client6_data.ia_na->len);
continue;
}
iaaddr = d6_find_option(client6_data.ia_na->data,
iaaddr = d6_find_option(client6_data.ia_na->data + 4 + 4 + 4,
client6_data.ia_na->data + client6_data.ia_na->len,
D6_OPT_IAADDR
);
if (!iaaddr) {
bb_error_msg("no lease time, ignoring packet");
bb_error_msg("no %s option, ignoring packet", "IAADDR");
continue;
}
if (iaaddr->len < (16 + 4 + 4)) {