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authorDenys Vlasenko <vda.linux@googlemail.com>2010-04-03 15:34:52 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2010-04-03 15:34:52 (GMT)
commit243ddcbc76d19847d9e8022dc2f6659078f5cc20 (patch)
treebadf9d7e92a70b2a2d60d47d35cad5418d91cdd1
parentccd1efc3c1d5b0187e20c1566654df92fa6be5c9 (diff)
downloadbusybox-243ddcbc76d19847d9e8022dc2f6659078f5cc20.tar.gz
busybox-243ddcbc76d19847d9e8022dc2f6659078f5cc20.tar.bz2
udhcpd: support decoding of option 120 "SIP servers". Closes bug 737
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--networking/udhcp/Config.in3
-rw-r--r--networking/udhcp/common.c35
-rw-r--r--networking/udhcp/common.h4
-rw-r--r--networking/udhcp/dhcpc.c85
4 files changed, 83 insertions, 44 deletions
diff --git a/networking/udhcp/Config.in b/networking/udhcp/Config.in
index fd2a61c..34adf35 100644
--- a/networking/udhcp/Config.in
+++ b/networking/udhcp/Config.in
@@ -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"
diff --git a/networking/udhcp/common.c b/networking/udhcp/common.c
index adbcd77..77d7fd5 100644
--- a/networking/udhcp/common.c
+++ b/networking/udhcp/common.c
@@ -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) {
diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index 1c5afa6..28e3471 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -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
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index c36d418..53e10d0 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -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)