mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-13 23:08:53 +00:00
udhcp: implement "raw" binary options. Closes bug 735
function old new delta allocate_tempopt_if_needed - 76 +76 udhcp_str2optset 351 415 +64 attach_option 380 398 +18 len_of_option_as_string 11 12 +1 dhcp_option_lengths 11 12 +1 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 4/0 up/down: 160/0) Total: 160 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
parent
4836331924
commit
4f3aa51f9d
@ -324,9 +324,27 @@ int FAST_FUNC udhcp_str2nip(const char *str, void *arg)
|
||||
}
|
||||
|
||||
/* udhcp_str2optset:
|
||||
* Parse string option representation to binary form
|
||||
* and add it to opt_list
|
||||
* Parse string option representation to binary form and add it to opt_list.
|
||||
* Called to parse "udhcpc -x OPTNAME:OPTVAL"
|
||||
* and to parse udhcpd.conf's "opt OPTNAME OPTVAL" directives.
|
||||
*/
|
||||
/* helper for the helper */
|
||||
static char *allocate_tempopt_if_needed(
|
||||
const struct dhcp_optflag *optflag,
|
||||
char *buffer,
|
||||
int *length_p)
|
||||
{
|
||||
char *allocated = NULL;
|
||||
if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_BIN) {
|
||||
const char *end;
|
||||
allocated = xstrdup(buffer); /* more than enough */
|
||||
end = hex2bin(allocated, buffer, 255);
|
||||
if (errno)
|
||||
bb_error_msg_and_die("malformed hex string '%s'", buffer);
|
||||
*length_p = end - allocated;
|
||||
}
|
||||
return allocated;
|
||||
}
|
||||
/* helper: add an option to the opt_list */
|
||||
static NOINLINE void attach_option(
|
||||
struct option_set **opt_list,
|
||||
@ -335,13 +353,12 @@ static NOINLINE void attach_option(
|
||||
int length)
|
||||
{
|
||||
struct option_set *existing, *new, **curr;
|
||||
#if ENABLE_FEATURE_UDHCP_RFC3397
|
||||
char *allocated = NULL;
|
||||
#endif
|
||||
|
||||
existing = udhcp_find_option(*opt_list, optflag->code);
|
||||
if (!existing) {
|
||||
log2("Attaching option %02x to list", optflag->code);
|
||||
allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
|
||||
#if ENABLE_FEATURE_UDHCP_RFC3397
|
||||
if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
|
||||
/* reuse buffer and length for RFC1035-formatted string */
|
||||
@ -368,7 +385,8 @@ static NOINLINE void attach_option(
|
||||
unsigned old_len;
|
||||
|
||||
/* add it to an existing option */
|
||||
log1("Attaching option %02x to existing member of list", optflag->code);
|
||||
log2("Attaching option %02x to existing member of list", optflag->code);
|
||||
allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
|
||||
old_len = existing->data[OPT_LEN];
|
||||
#if ENABLE_FEATURE_UDHCP_RFC3397
|
||||
if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
|
||||
@ -390,10 +408,8 @@ static NOINLINE void attach_option(
|
||||
} /* else, ignore the data, we could put this in a second option in the future */
|
||||
} /* else, ignore the new data */
|
||||
|
||||
ret: ;
|
||||
#if ENABLE_FEATURE_UDHCP_RFC3397
|
||||
ret:
|
||||
free(allocated);
|
||||
#endif
|
||||
}
|
||||
|
||||
int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
|
||||
@ -402,6 +418,8 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
|
||||
char *opt, *val, *endptr;
|
||||
char *str;
|
||||
const struct dhcp_optflag *optflag;
|
||||
struct dhcp_optflag bin_optflag;
|
||||
unsigned optcode;
|
||||
int retval, length;
|
||||
char buffer[8] ALIGNED(4);
|
||||
uint16_t *result_u16 = (uint16_t *) buffer;
|
||||
@ -413,7 +431,15 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
|
||||
if (!opt)
|
||||
return 0;
|
||||
|
||||
optflag = &dhcp_optflags[udhcp_option_idx(opt)];
|
||||
optcode = bb_strtou(opt, NULL, 0);
|
||||
if (!errno && optcode < 255) {
|
||||
/* Raw (numeric) option code */
|
||||
bin_optflag.flags = OPTION_BIN;
|
||||
bin_optflag.code = optcode;
|
||||
optflag = &bin_optflag;
|
||||
} else {
|
||||
optflag = &dhcp_optflags[udhcp_option_idx(opt)];
|
||||
}
|
||||
|
||||
retval = 0;
|
||||
do {
|
||||
@ -482,6 +508,9 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
|
||||
retval = (endptr[0] == '\0');
|
||||
break;
|
||||
}
|
||||
case OPTION_BIN: /* handled in attach_option() */
|
||||
opt = val;
|
||||
retval = 1;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
@ -70,17 +70,18 @@ enum {
|
||||
OPTION_IP = 1,
|
||||
OPTION_IP_PAIR,
|
||||
OPTION_STRING,
|
||||
#if ENABLE_FEATURE_UDHCP_RFC3397
|
||||
OPTION_DNS_STRING, /* RFC1035 compressed domain name list */
|
||||
OPTION_SIP_SERVERS,
|
||||
#endif
|
||||
// OPTION_BOOLEAN,
|
||||
OPTION_U8,
|
||||
OPTION_U16,
|
||||
// OPTION_S16,
|
||||
OPTION_U32,
|
||||
OPTION_S32,
|
||||
OPTION_BIN,
|
||||
OPTION_STATIC_ROUTES,
|
||||
#if ENABLE_FEATURE_UDHCP_RFC3397
|
||||
OPTION_DNS_STRING, /* RFC1035 compressed domain name list */
|
||||
OPTION_SIP_SERVERS,
|
||||
#endif
|
||||
|
||||
OPTION_TYPE_MASK = 0x0f,
|
||||
/* Client requests this option by default */
|
||||
|
Loading…
Reference in New Issue
Block a user