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udhcpd: support decoding of option 120 "SIP servers". Closes bug 737

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-04-03 17:34:52 +02:00
parent ccd1efc3c1
commit 243ddcbc76
4 changed files with 83 additions and 44 deletions
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3
networking/udhcp/Config.in
View File

@ -92,7 +92,8 @@ config FEATURE_UDHCP_RFC3397
depends on UDHCPD || UDHCPC
help
If selected, both client and server will support passing of domain
search lists via option 119, specified in RFC3397.
search lists via option 119, specified in RFC 3397,
and SIP servers option 120, specified in RFC 3361.
config UDHCPC_DEFAULT_SCRIPT
string "Absolute path to config script"

35
networking/udhcp/common.c
View File

@ -50,7 +50,8 @@ const struct dhcp_option dhcp_options[] = {
//TODO: not a string, but a set of LASCII strings:
// { OPTION_STRING , 0x4D }, /* DHCP_USER_CLASS */
#if ENABLE_FEATURE_UDHCP_RFC3397
{ OPTION_STR1035 | OPTION_LIST , 0x77 }, /* DHCP_DOMAIN_SEARCH */
{ OPTION_DNS_STRING | OPTION_LIST , 0x77 }, /* DHCP_DOMAIN_SEARCH */
{ OPTION_SIP_SERVERS , 0x78 }, /* DHCP_SIP_SERVERS */
#endif
{ OPTION_STATIC_ROUTES , 0x79 }, /* DHCP_STATIC_ROUTES */
{ OPTION_STRING , 0xfc }, /* DHCP_WPAD */
@ -106,22 +107,32 @@ const char dhcp_option_strings[] ALIGN1 =
// "userclass" "\0" /* DHCP_USER_CLASS */
#if ENABLE_FEATURE_UDHCP_RFC3397
"search" "\0" /* DHCP_DOMAIN_SEARCH */
// doesn't work in udhcpd.conf since OPTION_SIP_SERVERS
// is not handled yet by "string->option" conversion code:
"sipservers" "\0" /* DHCP_SIP_SERVERS */
#endif
// "staticroutes" is only used to set udhcpc environment, it doesn't work
// in udhcpd.conf since OPTION_STATIC_ROUTES is not handled yet
// by "string->option" conversion code:
"staticroutes" "\0"/* DHCP_STATIC_ROUTES */
"wpad" "\0" /* DHCP_WPAD */
// doesn't work in udhcpd.conf since OPTION_STATIC_ROUTES
// is not handled yet by "string->option" conversion code:
"staticroutes" "\0"/* DHCP_STATIC_ROUTES */
"wpad" "\0" /* DHCP_WPAD */
;
/* Lengths of the different option types */
/* Lengths of the option types in binary form.
* Used by:
* udhcp_str2optset: to determine how many bytes to allocate.
* xmalloc_optname_optval: to estimate string length
* from binary option length: (option[LEN] / dhcp_option_lengths[opt_type])
* is the number of elements, multiply in by one element's string width
* (len_of_option_as_string[opt_type]) and you know how wide string you need.
*/
const uint8_t dhcp_option_lengths[] ALIGN1 = {
[OPTION_IP] = 4,
[OPTION_IP_PAIR] = 8,
// [OPTION_BOOLEAN] = 1,
[OPTION_STRING] = 1,
[OPTION_STRING] = 1, /* ignored by udhcp_str2optset */
#if ENABLE_FEATURE_UDHCP_RFC3397
[OPTION_STR1035] = 1,
[OPTION_DNS_STRING] = 1, /* ignored by both udhcp_str2optset and xmalloc_optname_optval */
[OPTION_SIP_SERVERS] = 1,
#endif
[OPTION_U8] = 1,
[OPTION_U16] = 2,
@ -332,7 +343,7 @@ static NOINLINE void attach_option(
if (!existing) {
log2("Attaching option %02x to list", option->code);
#if ENABLE_FEATURE_UDHCP_RFC3397
if ((option->flags & OPTION_TYPE_MASK) == OPTION_STR1035) {
if ((option->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
/* reuse buffer and length for RFC1035-formatted string */
allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length);
}
@ -360,7 +371,7 @@ static NOINLINE void attach_option(
log1("Attaching option %02x to existing member of list", option->code);
old_len = existing->data[OPT_LEN];
#if ENABLE_FEATURE_UDHCP_RFC3397
if ((option->flags & OPTION_TYPE_MASK) == OPTION_STR1035) {
if ((option->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
/* reuse buffer and length for RFC1035-formatted string */
allocated = buffer = (char *)dname_enc(existing->data + OPT_DATA, old_len, buffer, &length);
}
@ -426,7 +437,7 @@ int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
break;
case OPTION_STRING:
#if ENABLE_FEATURE_UDHCP_RFC3397
case OPTION_STR1035:
case OPTION_DNS_STRING:
#endif
length = strnlen(val, 254);
if (length > 0) {

4
networking/udhcp/common.h
View File

@ -71,7 +71,8 @@ enum {
OPTION_IP_PAIR,
OPTION_STRING,
#if ENABLE_FEATURE_UDHCP_RFC3397
OPTION_STR1035, /* RFC1035 compressed domain name list */
OPTION_DNS_STRING, /* RFC1035 compressed domain name list */
OPTION_SIP_SERVERS,
#endif
// OPTION_BOOLEAN,
OPTION_U8,
@ -130,6 +131,7 @@ enum {
//#define DHCP_USER_CLASS 0x4d /* RFC 3004. set of LASCII strings. "I am a printer" etc */
#define DHCP_FQDN 0x51 /* client asks to update DNS to map its FQDN to its new IP */
//#define DHCP_DOMAIN_SEARCH 0x77 /* RFC 3397. set of ASCIZ string, DNS-style compressed */
//#define DHCP_SIP_SERVERS 0x78 /* RFC 3361. flag byte, then: 0: domain names, 1: IP addrs */
//#define DHCP_STATIC_ROUTES 0x79 /* RFC 3442. (mask,ip,router) tuples */
//#define DHCP_WPAD 0xfc /* MSIE's Web Proxy Autodiscovery Protocol */
#define DHCP_END 0xff

85
networking/udhcp/dhcpc.c
View File

@ -42,19 +42,24 @@
/* get a rough idea of how long an option will be (rounding up...) */
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,
[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,
[OPTION_DNS_STRING ] = 1, /* unused */
/* Hmmm, this severely overestimates size if SIP_SERVERS option
* is in domain name form: N-byte option in binary form
* mallocs ~16*N bytes. But it is freed almost at once.
*/
[OPTION_SIP_SERVERS ] = sizeof("255.255.255.255 "),
#endif
// [OPTION_BOOLEAN] = sizeof("yes "),
[OPTION_U8] = sizeof("255 "),
[OPTION_U16] = sizeof("65535 "),
// [OPTION_S16] = sizeof("-32768 "),
[OPTION_U32] = sizeof("4294967295 "),
[OPTION_S32] = sizeof("-2147483684 "),
// [OPTION_BOOLEAN ] = sizeof("yes "),
[OPTION_U8 ] = sizeof("255 "),
[OPTION_U16 ] = sizeof("65535 "),
// [OPTION_S16 ] = sizeof("-32768 "),
[OPTION_U32 ] = sizeof("4294967295 "),
[OPTION_S32 ] = sizeof("-2147483684 "),
};
/* note: ip is a pointer to an IP in network order, possibly misaliged */
@ -80,16 +85,13 @@ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_
{
unsigned upper_length;
int len, type, optlen;
uint16_t val_u16;
uint32_t val_u32;
int32_t val_s32;
char *dest, *ret;
/* option points to OPT_DATA, need to go back and get OPT_LEN */
len = option[OPT_LEN - OPT_DATA];
type = type_p->flags & OPTION_TYPE_MASK;
optlen = dhcp_option_lengths[type];
upper_length = len_of_option_as_string[type] * (len / optlen);
upper_length = len_of_option_as_string[type] * ((unsigned)len / (unsigned)optlen);
dest = ret = xmalloc(upper_length + strlen(opt_name) + 2);
dest += sprintf(ret, "%s=", opt_name);
@ -113,24 +115,20 @@ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_
case OPTION_U8:
dest += sprintf(dest, "%u", *option);
break;
case OPTION_U16:
// case OPTION_S16:
case OPTION_U16: {
uint16_t val_u16;
move_from_unaligned16(val_u16, option);
dest += sprintf(dest, "%u", ntohs(val_u16));
break;
// case OPTION_S16: {
// int16_t val_s16;
// move_from_unaligned16(val_s16, option);
// dest += sprintf(dest, "%d", ntohs(val_s16));
// break;
// }
case OPTION_U32:
move_from_unaligned32(val_u32, option);
dest += sprintf(dest, "%lu", (unsigned long) ntohl(val_u32));
break;
}
case OPTION_S32:
move_from_unaligned32(val_s32, option);
dest += sprintf(dest, "%ld", (long) ntohl(val_s32));
case OPTION_U32: {
uint32_t val_u32;
move_from_unaligned32(val_u32, option);
dest += sprintf(dest, type == OPTION_U32 ? "%lu" : "%ld", (unsigned long) ntohl(val_u32));
break;
}
case OPTION_STRING:
memcpy(dest, option, len);
dest[len] = '\0';
@ -180,7 +178,7 @@ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_
return ret;
}
#if ENABLE_FEATURE_UDHCP_RFC3397
case OPTION_STR1035:
case OPTION_DNS_STRING:
/* unpack option into dest; use ret for prefix (i.e., "optname=") */
dest = dname_dec(option, len, ret);
if (dest) {
@ -189,8 +187,35 @@ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_
}
/* error. return "optname=" string */
return ret;
case OPTION_SIP_SERVERS:
/* Option binary format:
* type: byte
* type=0: domain names, dns-compressed
* type=1: IP addrs
*/
option++;
len--;
if (option[-1] == 0) {
dest = dname_dec(option, len, ret);
if (dest) {
free(ret);
return dest;
}
} else
if (option[-1] == 1) {
const char *pfx = "";
while (1) {
len -= 4;
if (len < 0)
break;
dest += sprint_nip(dest, pfx, option);
pfx = " ";
option += 4;
}
}
return ret;
#endif
}
} /* switch */
option += optlen;
len -= optlen;
if (len <= 0)