/*
* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
*
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
#include "common.h"
* See RFC2132 for more options.
* OPTION_REQ: these options are requested by udhcpc (unless -o).
*/
-const struct dhcp_option dhcp_options[] = {
+const struct dhcp_optflag dhcp_optflags[] = {
/* flags code */
{ OPTION_IP | OPTION_REQ, 0x01 }, /* DHCP_SUBNET */
{ OPTION_S32 , 0x02 }, /* DHCP_TIME_OFFSET */
// { OPTION_IP | OPTION_LIST , 0x07 }, /* DHCP_LOG_SERVER */
// { OPTION_IP | OPTION_LIST , 0x08 }, /* DHCP_COOKIE_SERVER */
{ OPTION_IP | OPTION_LIST , 0x09 }, /* DHCP_LPR_SERVER */
- { OPTION_STRING | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME */
+ { OPTION_STRING_HOST | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME */
{ OPTION_U16 , 0x0d }, /* DHCP_BOOT_SIZE */
- { OPTION_STRING | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME */
+ { OPTION_STRING_HOST | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME */
{ OPTION_IP , 0x10 }, /* DHCP_SWAP_SERVER */
{ OPTION_STRING , 0x11 }, /* DHCP_ROOT_PATH */
{ OPTION_U8 , 0x17 }, /* DHCP_IP_TTL */
{ OPTION_U16 , 0x1a }, /* DHCP_MTU */
+//TODO: why do we request DHCP_BROADCAST? Can't we assume that
+//in the unlikely case it is different from typical N.N.255.255,
+//server would let us know anyway?
{ OPTION_IP | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST */
- { OPTION_STRING , 0x28 }, /* DHCP_NIS_DOMAIN */
+ { OPTION_IP_PAIR | OPTION_LIST , 0x21 }, /* DHCP_ROUTES */
+ { OPTION_STRING_HOST , 0x28 }, /* DHCP_NIS_DOMAIN */
{ OPTION_IP | OPTION_LIST , 0x29 }, /* DHCP_NIS_SERVER */
{ OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a }, /* DHCP_NTP_SERVER */
{ OPTION_IP | OPTION_LIST , 0x2c }, /* DHCP_WINS_SERVER */
{ OPTION_IP , 0x36 }, /* DHCP_SERVER_ID */
{ OPTION_STRING , 0x38 }, /* DHCP_ERR_MESSAGE */
//TODO: must be combined with 'sname' and 'file' handling:
- { OPTION_STRING , 0x42 }, /* DHCP_TFTP_SERVER_NAME */
+ { OPTION_STRING_HOST , 0x42 }, /* DHCP_TFTP_SERVER_NAME */
{ OPTION_STRING , 0x43 }, /* DHCP_BOOT_FILE */
//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_STATIC_ROUTES | OPTION_LIST , 0x79 }, /* DHCP_STATIC_ROUTES */
+#if ENABLE_FEATURE_UDHCP_8021Q
+ { OPTION_U16 , 0x84 }, /* DHCP_VLAN_ID */
+ { OPTION_U8 , 0x85 }, /* DHCP_VLAN_PRIORITY */
+#endif
+ { OPTION_6RD , 0xd4 }, /* DHCP_6RD */
+ { OPTION_STATIC_ROUTES | OPTION_LIST , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */
{ OPTION_STRING , 0xfc }, /* DHCP_WPAD */
/* Options below have no match in dhcp_option_strings[],
{ OPTION_IP , 0x32 }, /* DHCP_REQUESTED_IP */
{ OPTION_U8 , 0x35 }, /* DHCP_MESSAGE_TYPE */
{ OPTION_U16 , 0x39 }, /* DHCP_MAX_SIZE */
- { OPTION_STRING , 0x3c }, /* DHCP_VENDOR */
-//FIXME: handling of this option is not exactly correct:
- { OPTION_STRING , 0x3d }, /* DHCP_CLIENT_ID */
+//looks like these opts will work just fine even without these defs:
+// { OPTION_STRING , 0x3c }, /* DHCP_VENDOR */
+// /* not really a string: */
+// { OPTION_STRING , 0x3d }, /* DHCP_CLIENT_ID */
{ 0, 0 } /* zeroed terminating entry */
};
* for udhcpc stript, and for setting options for udhcpd via
* "opt OPTION_NAME OPTION_VALUE" directives in udhcpd.conf file.
*/
-/* Must match dhcp_options[] order */
+/* Must match dhcp_optflags[] order */
const char dhcp_option_strings[] ALIGN1 =
"subnet" "\0" /* DHCP_SUBNET */
"timezone" "\0" /* DHCP_TIME_OFFSET */
"ipttl" "\0" /* DHCP_IP_TTL */
"mtu" "\0" /* DHCP_MTU */
"broadcast" "\0" /* DHCP_BROADCAST */
+ "routes" "\0" /* DHCP_ROUTES */
"nisdomain" "\0" /* DHCP_NIS_DOMAIN */
"nissrv" "\0" /* DHCP_NIS_SERVER */
"ntpsrv" "\0" /* DHCP_NTP_SERVER */
// "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:
+ "sipsrv" "\0" /* DHCP_SIP_SERVERS */
+#endif
+ "staticroutes" "\0"/* DHCP_STATIC_ROUTES */
+#if ENABLE_FEATURE_UDHCP_8021Q
+ "vlanid" "\0" /* DHCP_VLAN_ID */
+ "vlanpriority" "\0"/* DHCP_VLAN_PRIORITY */
#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 */
+ "ip6rd" "\0" /* DHCP_6RD */
+ "msstaticroutes""\0"/* DHCP_MS_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 */
+ [OPTION_STRING_HOST] = 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,
[OPTION_S32] = 4,
/* Just like OPTION_STRING, we use minimum length here */
[OPTION_STATIC_ROUTES] = 5,
+ [OPTION_6RD] = 22, /* ignored by udhcp_str2optset */
};
# define log_option(pfx, opt) ((void)0)
#endif
-/* get an option with bounds checking (warning, result is not aligned). */
+unsigned FAST_FUNC udhcp_option_idx(const char *name)
+{
+ int n = index_in_strings(dhcp_option_strings, name);
+ if (n >= 0)
+ return n;
+
+ {
+ char buf[sizeof(dhcp_option_strings)];
+ char *d = buf;
+ const char *s = dhcp_option_strings;
+ while (s < dhcp_option_strings + sizeof(dhcp_option_strings) - 2) {
+ *d++ = (*s == '\0' ? ' ' : *s);
+ s++;
+ }
+ *d = '\0';
+ bb_error_msg_and_die("unknown option '%s', known options: %s", name, buf);
+ }
+}
+
+/* Get an option with bounds checking (warning, result is not aligned) */
uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
{
uint8_t *optionptr;
return NULL;
}
-/* return the position of the 'end' option (no bounds checking) */
+/* Return the position of the 'end' option (no bounds checking) */
int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
{
int i = 0;
/* Add an option (supplied in binary form) to the options.
* Option format: [code][len][data1][data2]..[dataLEN]
*/
-void FAST_FUNC udhcp_add_binary_option(uint8_t *optionptr, uint8_t *addopt)
+void FAST_FUNC udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt)
{
unsigned len;
+ uint8_t *optionptr = packet->options;
unsigned end = udhcp_end_option(optionptr);
- /* end position + option code/length + addopt length + end option */
len = OPT_DATA + addopt[OPT_LEN];
+ /* end position + (option code/length + addopt length) + end option */
if (end + len + 1 >= DHCP_OPTIONS_BUFSIZE) {
+//TODO: learn how to use overflow option if we exhaust packet->options[]
bb_error_msg("option 0x%02x did not fit into the packet",
addopt[OPT_CODE]);
return;
optionptr[end + len] = DHCP_END;
}
-/* Add a one to four byte option to a packet */
-void FAST_FUNC udhcp_add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data)
+/* Add an one to four byte option to a packet */
+void FAST_FUNC udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data)
{
- const struct dhcp_option *dh;
+ const struct dhcp_optflag *dh;
- for (dh = dhcp_options; dh->code; dh++) {
+ for (dh = dhcp_optflags; dh->code; dh++) {
if (dh->code == code) {
uint8_t option[6], len;
data <<= 8 * (4 - len);
/* Assignment is unaligned! */
move_to_unaligned32(&option[OPT_DATA], data);
- udhcp_add_binary_option(optionptr, option);
+ udhcp_add_binary_option(packet, option);
return;
}
}
}
/* Find option 'code' in opt_list */
-struct option_set* FAST_FUNC find_option(struct option_set *opt_list, uint8_t code)
+struct option_set* FAST_FUNC udhcp_find_option(struct option_set *opt_list, uint8_t code)
{
while (opt_list && opt_list->data[OPT_CODE] < code)
opt_list = opt_list->next;
lsa = host_and_af2sockaddr(str, 0, AF_INET);
if (!lsa)
return 0;
- *(uint32_t*)arg = lsa->u.sin.sin_addr.s_addr;
+ /* arg maybe unaligned */
+ move_to_unaligned32((uint32_t*)arg, lsa->u.sin.sin_addr.s_addr);
free(lsa);
return 1;
}
/* 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,
- const struct dhcp_option *option,
+ const struct dhcp_optflag *optflag,
char *buffer,
int length)
{
- struct option_set *existing, *new, **curr;
+ struct option_set *existing;
+ char *allocated;
+
+ allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
#if ENABLE_FEATURE_UDHCP_RFC3397
- char *allocated = NULL;
+ if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
+ /* reuse buffer and length for RFC1035-formatted string */
+ allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length);
+ }
#endif
- existing = find_option(*opt_list, option->code);
+ existing = udhcp_find_option(*opt_list, optflag->code);
if (!existing) {
- log2("Attaching option %02x to list", option->code);
-#if ENABLE_FEATURE_UDHCP_RFC3397
- if ((option->flags & OPTION_TYPE_MASK) == OPTION_STR1035) {
- /* reuse buffer and length for RFC1035-formatted string */
- allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length);
- }
-#endif
+ struct option_set *new, **curr;
+
/* make a new option */
+ log2("Attaching option %02x to list", optflag->code);
new = xmalloc(sizeof(*new));
new->data = xmalloc(length + OPT_DATA);
- new->data[OPT_CODE] = option->code;
+ new->data[OPT_CODE] = optflag->code;
new->data[OPT_LEN] = length;
- memcpy(new->data + OPT_DATA, buffer, length);
+ memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer), length);
curr = opt_list;
- while (*curr && (*curr)->data[OPT_CODE] < option->code)
+ while (*curr && (*curr)->data[OPT_CODE] < optflag->code)
curr = &(*curr)->next;
new->next = *curr;
goto ret;
}
- if (option->flags & OPTION_LIST) {
+ if (optflag->flags & OPTION_LIST) {
unsigned old_len;
/* add it to an existing option */
- log1("Attaching option %02x to existing member of list", option->code);
+ log2("Attaching option %02x to existing member of list", optflag->code);
old_len = existing->data[OPT_LEN];
-#if ENABLE_FEATURE_UDHCP_RFC3397
- if ((option->flags & OPTION_TYPE_MASK) == OPTION_STR1035) {
- /* reuse buffer and length for RFC1035-formatted string */
- allocated = buffer = (char *)dname_enc(existing->data + OPT_DATA, old_len, buffer, &length);
- }
-#endif
if (old_len + length < 255) {
/* actually 255 is ok too, but adding a space can overlow it */
existing->data = xrealloc(existing->data, OPT_DATA + 1 + old_len + length);
- if ((option->flags & OPTION_TYPE_MASK) == OPTION_STRING) {
+ if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING
+ || (optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING_HOST
+ ) {
/* add space separator between STRING options in a list */
existing->data[OPT_DATA + old_len] = ' ';
old_len++;
}
- memcpy(existing->data + OPT_DATA + old_len, buffer, length);
+ memcpy(existing->data + OPT_DATA + old_len, (allocated ? allocated : buffer), length);
existing->data[OPT_LEN] = old_len + length;
} /* 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)
{
struct option_set **opt_list = arg;
- char *opt, *val, *endptr;
+ char *opt, *val;
char *str;
- const struct dhcp_option *option;
- int retval, length, idx;
- char buffer[8] ALIGNED(4);
+ const struct dhcp_optflag *optflag;
+ struct dhcp_optflag bin_optflag;
+ unsigned optcode;
+ int retval, length;
+ /* IP_PAIR needs 8 bytes, STATIC_ROUTES needs 9 max */
+ char buffer[9] ALIGNED(4);
uint16_t *result_u16 = (uint16_t *) buffer;
uint32_t *result_u32 = (uint32_t *) buffer;
if (!opt)
return 0;
- idx = index_in_strings(dhcp_option_strings, opt); /* NB: was strcasecmp! */
- if (idx < 0)
- return 0;
- option = &dhcp_options[idx];
+ 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 {
val = strtok(NULL, ", \t");
if (!val)
break;
- length = dhcp_option_lengths[option->flags & OPTION_TYPE_MASK];
+ length = dhcp_option_lengths[optflag->flags & OPTION_TYPE_MASK];
retval = 0;
opt = buffer; /* new meaning for variable opt */
- switch (option->flags & OPTION_TYPE_MASK) {
+ switch (optflag->flags & OPTION_TYPE_MASK) {
case OPTION_IP:
retval = udhcp_str2nip(val, buffer);
break;
retval = udhcp_str2nip(val, buffer + 4);
break;
case OPTION_STRING:
+ case OPTION_STRING_HOST:
#if ENABLE_FEATURE_UDHCP_RFC3397
- case OPTION_STR1035:
+ case OPTION_DNS_STRING:
#endif
length = strnlen(val, 254);
if (length > 0) {
}
break;
// case OPTION_BOOLEAN: {
-// static const char noyes[] ALIGN1 = "no\0yes\0";
-// buffer[0] = retval = index_in_strings(noyes, val);
+// static const char no_yes[] ALIGN1 = "no\0yes\0";
+// buffer[0] = retval = index_in_strings(no_yes, val);
// retval++; /* 0 - bad; 1: "no" 2: "yes" */
// break;
// }
case OPTION_U8:
- buffer[0] = strtoul(val, &endptr, 0);
- retval = (endptr[0] == '\0');
+ buffer[0] = bb_strtou32(val, NULL, 0);
+ retval = (errno == 0);
break;
/* htonX are macros in older libc's, using temp var
* in code below for safety */
/* TODO: use bb_strtoX? */
case OPTION_U16: {
- unsigned long tmp = strtoul(val, &endptr, 0);
+ uint32_t tmp = bb_strtou32(val, NULL, 0);
*result_u16 = htons(tmp);
- retval = (endptr[0] == '\0' /*&& tmp < 0x10000*/);
+ retval = (errno == 0 /*&& tmp < 0x10000*/);
break;
}
// case OPTION_S16: {
-// long tmp = strtol(val, &endptr, 0);
+// long tmp = bb_strtoi32(val, NULL, 0);
// *result_u16 = htons(tmp);
-// retval = (endptr[0] == '\0');
+// retval = (errno == 0);
// break;
// }
case OPTION_U32: {
- unsigned long tmp = strtoul(val, &endptr, 0);
+ uint32_t tmp = bb_strtou32(val, NULL, 0);
*result_u32 = htonl(tmp);
- retval = (endptr[0] == '\0');
+ retval = (errno == 0);
break;
}
case OPTION_S32: {
- long tmp = strtol(val, &endptr, 0);
+ int32_t tmp = bb_strtoi32(val, NULL, 0);
*result_u32 = htonl(tmp);
- retval = (endptr[0] == '\0');
+ retval = (errno == 0);
+ break;
+ }
+ case OPTION_STATIC_ROUTES: {
+ /* Input: "a.b.c.d/m" */
+ /* Output: mask(1 byte),pfx(0-4 bytes),gw(4 bytes) */
+ unsigned mask;
+ char *slash = strchr(val, '/');
+ if (slash) {
+ *slash = '\0';
+ retval = udhcp_str2nip(val, buffer + 1);
+ buffer[0] = mask = bb_strtou(slash + 1, NULL, 10);
+ val = strtok(NULL, ", \t/-");
+ if (!val || mask > 32 || errno)
+ retval = 0;
+ if (retval) {
+ length = ((mask + 7) >> 3) + 5;
+ retval = udhcp_str2nip(val, buffer + (length - 4));
+ }
+ }
break;
}
+ case OPTION_BIN: /* handled in attach_option() */
+ opt = val;
+ retval = 1;
default:
break;
}
if (retval)
- attach_option(opt_list, option, opt, length);
- } while (retval && option->flags & OPTION_LIST);
+ attach_option(opt_list, optflag, opt, length);
+ } while (retval && (optflag->flags & OPTION_LIST));
return retval;
}
+
+/* note: ip is a pointer to an IPv6 in network order, possibly misaliged */
+int FAST_FUNC sprint_nip6(char *dest, /*const char *pre,*/ const uint8_t *ip)
+{
+ char hexstrbuf[16 * 2];
+ bin2hex(hexstrbuf, (void*)ip, 16);
+ return sprintf(dest, /* "%s" */
+ "%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s",
+ /* pre, */
+ hexstrbuf + 0 * 4,
+ hexstrbuf + 1 * 4,
+ hexstrbuf + 2 * 4,
+ hexstrbuf + 3 * 4,
+ hexstrbuf + 4 * 4,
+ hexstrbuf + 5 * 4,
+ hexstrbuf + 6 * 4,
+ hexstrbuf + 7 * 4
+ );
+}