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udhcp: move options.c to common.c; disable unused bool and s16 option code

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function                                             old     new   delta
udhcp_add_binary_option                                -      94     +94
udhcp_str2nip                                          -      42     +42
len_of_option_as_string                               12      10      -2
dhcp_option_lengths                                   12      10      -2
udhcpc_main                                         2859    2851      -8
read_nip                                              42       -     -42
xmalloc_optname_optval                               590     536     -54
udhcp_str2optset                                     443     366     -77
udhcp_add_option_string                               86       -     -86
------------------------------------------------------------------------------
(add/remove: 2/2 grow/shrink: 0/5 up/down: 136/-271)         Total: -135 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2010-03-26 08:35:24 +01:00
parent 7e6add1dfc
commit a8f6b99987
8 changed files with 485 additions and 497 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
networking/udhcp/Kbuild
View File

@@ -7,8 +7,8 @@
lib-y:= lib-y:=
lib-$(CONFIG_UDHCPC) += common.o options.o packet.o signalpipe.o socket.o lib-$(CONFIG_UDHCPC) += common.o packet.o signalpipe.o socket.o
lib-$(CONFIG_UDHCPD) += common.o options.o packet.o signalpipe.o socket.o lib-$(CONFIG_UDHCPD) += common.o packet.o signalpipe.o socket.o
lib-$(CONFIG_UDHCPC) += dhcpc.o lib-$(CONFIG_UDHCPC) += dhcpc.o
lib-$(CONFIG_UDHCPD) += dhcpd.o arpping.o files.o leases.o static_leases.o lib-$(CONFIG_UDHCPD) += dhcpd.o arpping.o files.o leases.o static_leases.o

454
networking/udhcp/common.c
View File

@@ -1,7 +1,8 @@
/* vi: set sw=4 ts=4: */ /* vi: set sw=4 ts=4: */
/* common.c /*
* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
* *
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * Licensed under GPLv2, see file LICENSE in this tarball for details.
*/ */
#include "common.h" #include "common.h"
@@ -12,3 +13,452 @@ unsigned dhcp_verbose;
const uint8_t MAC_BCAST_ADDR[6] ALIGN2 = { const uint8_t MAC_BCAST_ADDR[6] ALIGN2 = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
}; };
/* Supported options are easily added here.
* See RFC2132 for more options.
* OPTION_REQ: these options are requested by udhcpc (unless -o).
*/
const struct dhcp_option dhcp_options[] = {
/* flags code */
{ OPTION_IP | OPTION_REQ, 0x01 }, /* DHCP_SUBNET */
{ OPTION_S32 , 0x02 }, /* DHCP_TIME_OFFSET */
{ OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03 }, /* DHCP_ROUTER */
// { OPTION_IP | OPTION_LIST , 0x04 }, /* DHCP_TIME_SERVER */
// { OPTION_IP | OPTION_LIST , 0x05 }, /* DHCP_NAME_SERVER */
{ OPTION_IP | OPTION_LIST | OPTION_REQ, 0x06 }, /* DHCP_DNS_SERVER */
// { 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_U16 , 0x0d }, /* DHCP_BOOT_SIZE */
{ OPTION_STRING | 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 */
{ OPTION_IP | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST */
{ OPTION_STRING , 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_U32 , 0x33 }, /* DHCP_LEASE_TIME */
{ 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 , 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 */
#endif
{ OPTION_STATIC_ROUTES , 0x79 }, /* DHCP_STATIC_ROUTES */
{ OPTION_STRING , 0xfc }, /* DHCP_WPAD */
/* Options below have no match in dhcp_option_strings[],
* are not passed to dhcpc scripts, and cannot be specified
* with "option XXX YYY" syntax in dhcpd config file.
* These entries are only used internally by udhcp[cd]
* to correctly encode options into packets.
*/
{ 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 */
{ 0, 0 } /* zeroed terminating entry */
};
/* Used for converting options from incoming packets to env variables
* 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 */
const char dhcp_option_strings[] ALIGN1 =
"subnet" "\0" /* DHCP_SUBNET */
"timezone" "\0" /* DHCP_TIME_OFFSET */
"router" "\0" /* DHCP_ROUTER */
// "timesrv" "\0" /* DHCP_TIME_SERVER */
// "namesrv" "\0" /* DHCP_NAME_SERVER */
"dns" "\0" /* DHCP_DNS_SERVER */
// "logsrv" "\0" /* DHCP_LOG_SERVER */
// "cookiesrv" "\0" /* DHCP_COOKIE_SERVER */
"lprsrv" "\0" /* DHCP_LPR_SERVER */
"hostname" "\0" /* DHCP_HOST_NAME */
"bootsize" "\0" /* DHCP_BOOT_SIZE */
"domain" "\0" /* DHCP_DOMAIN_NAME */
"swapsrv" "\0" /* DHCP_SWAP_SERVER */
"rootpath" "\0" /* DHCP_ROOT_PATH */
"ipttl" "\0" /* DHCP_IP_TTL */
"mtu" "\0" /* DHCP_MTU */
"broadcast" "\0" /* DHCP_BROADCAST */
"nisdomain" "\0" /* DHCP_NIS_DOMAIN */
"nissrv" "\0" /* DHCP_NIS_SERVER */
"ntpsrv" "\0" /* DHCP_NTP_SERVER */
"wins" "\0" /* DHCP_WINS_SERVER */
"lease" "\0" /* DHCP_LEASE_TIME */
"serverid" "\0" /* DHCP_SERVER_ID */
"message" "\0" /* DHCP_ERR_MESSAGE */
"tftp" "\0" /* DHCP_TFTP_SERVER_NAME */
"bootfile" "\0" /* DHCP_BOOT_FILE */
// "userclass" "\0" /* DHCP_USER_CLASS */
#if ENABLE_FEATURE_UDHCP_RFC3397
"search" "\0" /* DHCP_DOMAIN_SEARCH */
#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 */
;
/* Lengths of the different option types */
const uint8_t dhcp_option_lengths[] ALIGN1 = {
[OPTION_IP] = 4,
[OPTION_IP_PAIR] = 8,
// [OPTION_BOOLEAN] = 1,
[OPTION_STRING] = 1,
#if ENABLE_FEATURE_UDHCP_RFC3397
[OPTION_STR1035] = 1,
#endif
[OPTION_U8] = 1,
[OPTION_U16] = 2,
// [OPTION_S16] = 2,
[OPTION_U32] = 4,
[OPTION_S32] = 4,
/* Just like OPTION_STRING, we use minimum length here */
[OPTION_STATIC_ROUTES] = 5,
};
#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
static void log_option(const char *pfx, const uint8_t *opt)
{
if (dhcp_verbose >= 2) {
char buf[256 * 2 + 2];
*bin2hex(buf, (void*) (opt + OPT_DATA), opt[OPT_LEN]) = '\0';
bb_info_msg("%s: 0x%02x %s", pfx, opt[OPT_CODE], buf);
}
}
#else
# define log_option(pfx, opt) ((void)0)
#endif
/* 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;
int len;
int rem;
int overload = 0;
enum {
FILE_FIELD101 = FILE_FIELD * 0x101,
SNAME_FIELD101 = SNAME_FIELD * 0x101,
};
/* option bytes: [code][len][data1][data2]..[dataLEN] */
optionptr = packet->options;
rem = sizeof(packet->options);
while (1) {
if (rem <= 0) {
bb_error_msg("bad packet, malformed option field");
return NULL;
}
if (optionptr[OPT_CODE] == DHCP_PADDING) {
rem--;
optionptr++;
continue;
}
if (optionptr[OPT_CODE] == DHCP_END) {
if ((overload & FILE_FIELD101) == FILE_FIELD) {
/* can use packet->file, and didn't look at it yet */
overload |= FILE_FIELD101; /* "we looked at it" */
optionptr = packet->file;
rem = sizeof(packet->file);
continue;
}
if ((overload & SNAME_FIELD101) == SNAME_FIELD) {
/* can use packet->sname, and didn't look at it yet */
overload |= SNAME_FIELD101; /* "we looked at it" */
optionptr = packet->sname;
rem = sizeof(packet->sname);
continue;
}
break;
}
len = 2 + optionptr[OPT_LEN];
rem -= len;
if (rem < 0)
continue; /* complain and return NULL */
if (optionptr[OPT_CODE] == code) {
log_option("Option found", optionptr);
return optionptr + OPT_DATA;
}
if (optionptr[OPT_CODE] == DHCP_OPTION_OVERLOAD) {
overload |= optionptr[OPT_DATA];
/* fall through */
}
optionptr += len;
}
/* log3 because udhcpc uses it a lot - very noisy */
log3("Option 0x%02x not found", code);
return NULL;
}
/* return the position of the 'end' option (no bounds checking) */
int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
{
int i = 0;
while (optionptr[i] != DHCP_END) {
if (optionptr[i] != DHCP_PADDING)
i += optionptr[i + OPT_LEN] + OPT_DATA-1;
i++;
}
return i;
}
/* 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)
{
unsigned len;
unsigned end = udhcp_end_option(optionptr);
/* end position + option code/length + addopt length + end option */
len = OPT_DATA + addopt[OPT_LEN];
if (end + len + 1 >= DHCP_OPTIONS_BUFSIZE) {
bb_error_msg("option 0x%02x did not fit into the packet",
addopt[OPT_CODE]);
return;
}
log_option("Adding option", addopt);
memcpy(optionptr + end, addopt, len);
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)
{
const struct dhcp_option *dh;
for (dh = dhcp_options; dh->code; dh++) {
if (dh->code == code) {
uint8_t option[6], len;
option[OPT_CODE] = code;
len = dhcp_option_lengths[dh->flags & OPTION_TYPE_MASK];
option[OPT_LEN] = len;
if (BB_BIG_ENDIAN)
data <<= 8 * (4 - len);
/* Assignment is unaligned! */
move_to_unaligned32(&option[OPT_DATA], data);
udhcp_add_binary_option(optionptr, option);
return;
}
}
bb_error_msg("can't add option 0x%02x", code);
}
/* Find option 'code' in opt_list */
struct option_set* FAST_FUNC find_option(struct option_set *opt_list, uint8_t code)
{
while (opt_list && opt_list->data[OPT_CODE] < code)
opt_list = opt_list->next;
if (opt_list && opt_list->data[OPT_CODE] == code)
return opt_list;
return NULL;
}
/* Parse string to IP in network order */
int FAST_FUNC udhcp_str2nip(const char *str, void *arg)
{
len_and_sockaddr *lsa;
lsa = host_and_af2sockaddr(str, 0, AF_INET);
if (!lsa)
return 0;
*(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
*/
/* helper: add an option to the opt_list */
static NOINLINE void attach_option(
struct option_set **opt_list,
const struct dhcp_option *option,
char *buffer,
int length)
{
struct option_set *existing, *new, **curr;
#if ENABLE_FEATURE_UDHCP_RFC3397
char *allocated = NULL;
#endif
existing = find_option(*opt_list, option->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
/* make a new option */
new = xmalloc(sizeof(*new));
new->data = xmalloc(length + OPT_DATA);
new->data[OPT_CODE] = option->code;
new->data[OPT_LEN] = length;
memcpy(new->data + OPT_DATA, buffer, length);
curr = opt_list;
while (*curr && (*curr)->data[OPT_CODE] < option->code)
curr = &(*curr)->next;
new->next = *curr;
*curr = new;
goto ret;
}
if (option->flags & OPTION_LIST) {
unsigned old_len;
/* add it to an existing 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) {
/* 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) {
/* 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);
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
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 *str;
const struct dhcp_option *option;
int retval, length, idx;
char buffer[8] ALIGNED(4);
uint16_t *result_u16 = (uint16_t *) buffer;
uint32_t *result_u32 = (uint32_t *) buffer;
/* Cheat, the only *const* str possible is "" */
str = (char *) const_str;
opt = strtok(str, " \t=");
if (!opt)
return 0;
idx = index_in_strings(dhcp_option_strings, opt); /* NB: was strcasecmp! */
if (idx < 0)
return 0;
option = &dhcp_options[idx];
retval = 0;
do {
val = strtok(NULL, ", \t");
if (!val)
break;
length = dhcp_option_lengths[option->flags & OPTION_TYPE_MASK];
retval = 0;
opt = buffer; /* new meaning for variable opt */
switch (option->flags & OPTION_TYPE_MASK) {
case OPTION_IP:
retval = udhcp_str2nip(val, buffer);
break;
case OPTION_IP_PAIR:
retval = udhcp_str2nip(val, buffer);
val = strtok(NULL, ", \t/-");
if (!val)
retval = 0;
if (retval)
retval = udhcp_str2nip(val, buffer + 4);
break;
case OPTION_STRING:
#if ENABLE_FEATURE_UDHCP_RFC3397
case OPTION_STR1035:
#endif
length = strnlen(val, 254);
if (length > 0) {
opt = val;
retval = 1;
}
break;
// case OPTION_BOOLEAN: {
// static const char noyes[] ALIGN1 = "no\0yes\0";
// buffer[0] = retval = index_in_strings(noyes, val);
// retval++; /* 0 - bad; 1: "no" 2: "yes" */
// break;
// }
case OPTION_U8:
buffer[0] = strtoul(val, &endptr, 0);
retval = (endptr[0] == '\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);
*result_u16 = htons(tmp);
retval = (endptr[0] == '\0' /*&& tmp < 0x10000*/);
break;
}
// case OPTION_S16: {
// long tmp = strtol(val, &endptr, 0);
// *result_u16 = htons(tmp);
// retval = (endptr[0] == '\0');
// break;
// }
case OPTION_U32: {
unsigned long tmp = strtoul(val, &endptr, 0);
*result_u32 = htonl(tmp);
retval = (endptr[0] == '\0');
break;
}
case OPTION_S32: {
long tmp = strtol(val, &endptr, 0);
*result_u32 = htonl(tmp);
retval = (endptr[0] == '\0');
break;
}
default:
break;
}
if (retval)
attach_option(opt_list, option, opt, length);
} while (retval && option->flags & OPTION_LIST);
return retval;
}

14
networking/udhcp/common.h
View File

@@ -74,10 +74,10 @@ enum {
#if ENABLE_FEATURE_UDHCP_RFC3397 #if ENABLE_FEATURE_UDHCP_RFC3397
OPTION_STR1035, /* RFC1035 compressed domain name list */ OPTION_STR1035, /* RFC1035 compressed domain name list */
#endif #endif
OPTION_BOOLEAN, // OPTION_BOOLEAN,
OPTION_U8, OPTION_U8,
OPTION_U16, OPTION_U16,
OPTION_S16, // OPTION_S16,
OPTION_U32, OPTION_U32,
OPTION_S32, OPTION_S32,
OPTION_STATIC_ROUTES, OPTION_STATIC_ROUTES,
@@ -172,14 +172,13 @@ extern const uint8_t dhcp_option_lengths[];
uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC; uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
int udhcp_end_option(uint8_t *optionptr) FAST_FUNC; int udhcp_end_option(uint8_t *optionptr) FAST_FUNC;
void udhcp_add_option_string(uint8_t *optionptr, uint8_t *string) FAST_FUNC; void udhcp_add_binary_option(uint8_t *optionptr, uint8_t *addopt) FAST_FUNC;
void udhcp_add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) FAST_FUNC; void udhcp_add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) FAST_FUNC;
#if ENABLE_FEATURE_UDHCP_RFC3397 #if ENABLE_FEATURE_UDHCP_RFC3397
char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC; char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC;
uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC; uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC;
#endif #endif
/* 2nd param is actually "struct option_set**" */ struct option_set *find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
int FAST_FUNC udhcp_str2optset(const char *const_line, void *arg);
// RFC 2131 Table 5: Fields and options used by DHCP clients // RFC 2131 Table 5: Fields and options used by DHCP clients
@@ -255,6 +254,11 @@ void udhcp_dump_packet(struct dhcp_packet *packet) FAST_FUNC;
/*** Other shared functions ***/ /*** Other shared functions ***/
/* 2nd param is "uint32_t*" */
int FAST_FUNC udhcp_str2nip(const char *str, void *arg);
/* 2nd param is "struct option_set**" */
int FAST_FUNC udhcp_str2optset(const char *str, void *arg);
uint16_t udhcp_checksum(void *addr, int count) FAST_FUNC; uint16_t udhcp_checksum(void *addr, int count) FAST_FUNC;
void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC; void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC;

33
networking/udhcp/dhcpc.c
View File

@@ -49,10 +49,10 @@ static const uint8_t len_of_option_as_string[] = {
#if ENABLE_FEATURE_UDHCP_RFC3397 #if ENABLE_FEATURE_UDHCP_RFC3397
[OPTION_STR1035] = 1, [OPTION_STR1035] = 1,
#endif #endif
[OPTION_BOOLEAN] = sizeof("yes "), // [OPTION_BOOLEAN] = sizeof("yes "),
[OPTION_U8] = sizeof("255 "), [OPTION_U8] = sizeof("255 "),
[OPTION_U16] = sizeof("65535 "), [OPTION_U16] = sizeof("65535 "),
[OPTION_S16] = sizeof("-32768 "), // [OPTION_S16] = sizeof("-32768 "),
[OPTION_U32] = sizeof("4294967295 "), [OPTION_U32] = sizeof("4294967295 "),
[OPTION_S32] = sizeof("-2147483684 "), [OPTION_S32] = sizeof("-2147483684 "),
}; };
@@ -81,7 +81,6 @@ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_
unsigned upper_length; unsigned upper_length;
int len, type, optlen; int len, type, optlen;
uint16_t val_u16; uint16_t val_u16;
int16_t val_s16;
uint32_t val_u32; uint32_t val_u32;
int32_t val_s32; int32_t val_s32;
char *dest, *ret; char *dest, *ret;
@@ -108,9 +107,9 @@ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_
// Should we bail out/warn if we see multi-ip option which is // Should we bail out/warn if we see multi-ip option which is
// not allowed to be such? For example, DHCP_BROADCAST... // not allowed to be such? For example, DHCP_BROADCAST...
break; break;
case OPTION_BOOLEAN: // case OPTION_BOOLEAN:
dest += sprintf(dest, *option ? "yes" : "no"); // dest += sprintf(dest, *option ? "yes" : "no");
break; // break;
case OPTION_U8: case OPTION_U8:
dest += sprintf(dest, "%u", *option); dest += sprintf(dest, "%u", *option);
break; break;
@@ -118,10 +117,12 @@ static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_
move_from_unaligned16(val_u16, option); move_from_unaligned16(val_u16, option);
dest += sprintf(dest, "%u", ntohs(val_u16)); dest += sprintf(dest, "%u", ntohs(val_u16));
break; break;
case OPTION_S16: // case OPTION_S16: {
move_from_unaligned16(val_s16, option); // int16_t val_s16;
dest += sprintf(dest, "%d", ntohs(val_s16)); // move_from_unaligned16(val_s16, option);
break; // dest += sprintf(dest, "%d", ntohs(val_s16));
// break;
// }
case OPTION_U32: case OPTION_U32:
move_from_unaligned32(val_u32, option); move_from_unaligned32(val_u32, option);
dest += sprintf(dest, "%lu", (unsigned long) ntohl(val_u32)); dest += sprintf(dest, "%lu", (unsigned long) ntohl(val_u32));
@@ -318,23 +319,23 @@ static void init_packet(struct dhcp_packet *packet, char type)
udhcp_init_header(packet, type); udhcp_init_header(packet, type);
memcpy(packet->chaddr, client_config.client_mac, 6); memcpy(packet->chaddr, client_config.client_mac, 6);
if (client_config.clientid) if (client_config.clientid)
udhcp_add_option_string(packet->options, client_config.clientid); udhcp_add_binary_option(packet->options, client_config.clientid);
if (client_config.hostname) if (client_config.hostname)
udhcp_add_option_string(packet->options, client_config.hostname); udhcp_add_binary_option(packet->options, client_config.hostname);
if (client_config.fqdn) if (client_config.fqdn)
udhcp_add_option_string(packet->options, client_config.fqdn); udhcp_add_binary_option(packet->options, client_config.fqdn);
if (type != DHCPDECLINE if (type != DHCPDECLINE
&& type != DHCPRELEASE && type != DHCPRELEASE
&& client_config.vendorclass && client_config.vendorclass
) { ) {
udhcp_add_option_string(packet->options, client_config.vendorclass); udhcp_add_binary_option(packet->options, client_config.vendorclass);
} }
} }
static void add_client_options(struct dhcp_packet *packet) static void add_client_options(struct dhcp_packet *packet)
{ {
/* Add am "param req" option with the list of options we'd like to have /* Add am "param req" option with the list of options we'd like to have
* from stubborn DHCP servers. Pull the data from the struct in options.c. * from stubborn DHCP servers. Pull the data from the struct in common.c.
* No bounds checking because it goes towards the head of the packet. */ * No bounds checking because it goes towards the head of the packet. */
uint8_t c; uint8_t c;
int end = udhcp_end_option(packet->options); int end = udhcp_end_option(packet->options);
@@ -360,7 +361,7 @@ static void add_client_options(struct dhcp_packet *packet)
{ {
struct option_set *curr = client_config.options; struct option_set *curr = client_config.options;
while (curr) { while (curr) {
udhcp_add_option_string(packet->options, curr->data); udhcp_add_binary_option(packet->options, curr->data);
curr = curr->next; curr = curr->next;
} }
// if (client_config.sname) // if (client_config.sname)

2
networking/udhcp/dhcpd.c
View File

@@ -105,7 +105,7 @@ static void add_server_options(struct dhcp_packet *packet)
while (curr) { while (curr) {
if (curr->data[OPT_CODE] != DHCP_LEASE_TIME) if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
udhcp_add_option_string(packet->options, curr->data); udhcp_add_binary_option(packet->options, curr->data);
curr = curr->next; curr = curr->next;
} }

1
networking/udhcp/dhcpd.h
View File

@@ -123,7 +123,6 @@ void log_static_leases(struct static_lease **st_lease_pp) FAST_FUNC;
void read_config(const char *file) FAST_FUNC; void read_config(const char *file) FAST_FUNC;
void write_leases(void) FAST_FUNC; void write_leases(void) FAST_FUNC;
void read_leases(const char *file) FAST_FUNC; void read_leases(const char *file) FAST_FUNC;
struct option_set *find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
POP_SAVED_FUNCTION_VISIBILITY POP_SAVED_FUNCTION_VISIBILITY

212
networking/udhcp/files.c
View File

@@ -22,18 +22,6 @@ static inline uint64_t hton64(uint64_t v)
#define ntoh64(v) hton64(v) #define ntoh64(v) hton64(v)
/* on these functions, make sure your datatype matches */ /* on these functions, make sure your datatype matches */
static int FAST_FUNC read_nip(const char *line, void *arg)
{
len_and_sockaddr *lsa;
lsa = host_and_af2sockaddr(line, 0, AF_INET);
if (!lsa)
return 0;
*(uint32_t*)arg = lsa->u.sin.sin_addr.s_addr;
free(lsa);
return 1;
}
static int FAST_FUNC read_str(const char *line, void *arg) static int FAST_FUNC read_str(const char *line, void *arg)
{ {
char **dest = arg; char **dest = arg;
@@ -49,198 +37,6 @@ static int FAST_FUNC read_u32(const char *line, void *arg)
return errno == 0; return errno == 0;
} }
static int read_yn(const char *line, void *arg)
{
char *dest = arg;
if (strcasecmp("yes", line) == 0) {
*dest = 1;
return 1;
}
if (strcasecmp("no", line) == 0) {
*dest = 0;
return 1;
}
return 0;
}
/* find option 'code' in opt_list */
struct option_set* FAST_FUNC find_option(struct option_set *opt_list, uint8_t code)
{
while (opt_list && opt_list->data[OPT_CODE] < code)
opt_list = opt_list->next;
if (opt_list && opt_list->data[OPT_CODE] == code)
return opt_list;
return NULL;
}
/* add an option to the opt_list */
static NOINLINE void attach_option(
struct option_set **opt_list,
const struct dhcp_option *option,
char *buffer,
int length)
{
struct option_set *existing, *new, **curr;
#if ENABLE_FEATURE_UDHCP_RFC3397
char *allocated = NULL;
#endif
existing = find_option(*opt_list, option->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
/* make a new option */
new = xmalloc(sizeof(*new));
new->data = xmalloc(length + OPT_DATA);
new->data[OPT_CODE] = option->code;
new->data[OPT_LEN] = length;
memcpy(new->data + OPT_DATA, buffer, length);
curr = opt_list;
while (*curr && (*curr)->data[OPT_CODE] < option->code)
curr = &(*curr)->next;
new->next = *curr;
*curr = new;
goto ret;
}
if (option->flags & OPTION_LIST) {
unsigned old_len;
/* add it to an existing 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) {
/* 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) {
/* 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);
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
free(allocated);
#endif
}
/* read a dhcp option and add it to opt_list */
int FAST_FUNC udhcp_str2optset(const char *const_line, void *arg)
{
struct option_set **opt_list = arg;
char *opt, *val, *endptr;
char *line;
const struct dhcp_option *option;
int retval, length, idx;
char buffer[8] ALIGNED(4);
uint16_t *result_u16 = (uint16_t *) buffer;
uint32_t *result_u32 = (uint32_t *) buffer;
/* Cheat, the only *const* line possible is "" */
line = (char *) const_line;
opt = strtok(line, " \t=");
if (!opt)
return 0;
idx = index_in_strings(dhcp_option_strings, opt); /* NB: was strcasecmp! */
if (idx < 0)
return 0;
option = &dhcp_options[idx];
retval = 0;
do {
val = strtok(NULL, ", \t");
if (!val)
break;
length = dhcp_option_lengths[option->flags & OPTION_TYPE_MASK];
retval = 0;
opt = buffer; /* new meaning for variable opt */
switch (option->flags & OPTION_TYPE_MASK) {
case OPTION_IP:
retval = read_nip(val, buffer);
break;
case OPTION_IP_PAIR:
retval = read_nip(val, buffer);
val = strtok(NULL, ", \t/-");
if (!val)
retval = 0;
if (retval)
retval = read_nip(val, buffer + 4);
break;
case OPTION_STRING:
#if ENABLE_FEATURE_UDHCP_RFC3397
case OPTION_STR1035:
#endif
length = strnlen(val, 254);
if (length > 0) {
opt = val;
retval = 1;
}
break;
case OPTION_BOOLEAN:
retval = read_yn(val, buffer);
break;
case OPTION_U8:
buffer[0] = strtoul(val, &endptr, 0);
retval = (endptr[0] == '\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);
*result_u16 = htons(tmp);
retval = (endptr[0] == '\0' /*&& tmp < 0x10000*/);
break;
}
case OPTION_S16: {
long tmp = strtol(val, &endptr, 0);
*result_u16 = htons(tmp);
retval = (endptr[0] == '\0');
break;
}
case OPTION_U32: {
unsigned long tmp = strtoul(val, &endptr, 0);
*result_u32 = htonl(tmp);
retval = (endptr[0] == '\0');
break;
}
case OPTION_S32: {
long tmp = strtol(val, &endptr, 0);
*result_u32 = htonl(tmp);
retval = (endptr[0] == '\0');
break;
}
default:
break;
}
if (retval)
attach_option(opt_list, option, opt, length);
} while (retval && option->flags & OPTION_LIST);
return retval;
}
static int FAST_FUNC read_staticlease(const char *const_line, void *arg) static int FAST_FUNC read_staticlease(const char *const_line, void *arg)
{ {
char *line; char *line;
@@ -257,7 +53,7 @@ static int FAST_FUNC read_staticlease(const char *const_line, void *arg)
/* Read ip */ /* Read ip */
ip_string = strtok_r(NULL, " \t", &line); ip_string = strtok_r(NULL, " \t", &line);
if (!ip_string || !read_nip(ip_string, &nip)) if (!ip_string || !udhcp_str2nip(ip_string, &nip))
return 0; return 0;
add_static_lease(arg, (uint8_t*) &mac_bytes, nip); add_static_lease(arg, (uint8_t*) &mac_bytes, nip);
@@ -277,8 +73,8 @@ struct config_keyword {
static const struct config_keyword keywords[] = { static const struct config_keyword keywords[] = {
/* keyword handler variable address default */ /* keyword handler variable address default */
{"start", read_nip, &(server_config.start_ip), "192.168.0.20"}, {"start", udhcp_str2nip, &(server_config.start_ip), "192.168.0.20"},
{"end", read_nip, &(server_config.end_ip), "192.168.0.254"}, {"end", udhcp_str2nip, &(server_config.end_ip), "192.168.0.254"},
{"interface", read_str, &(server_config.interface), "eth0"}, {"interface", read_str, &(server_config.interface), "eth0"},
/* Avoid "max_leases value not sane" warning by setting default /* Avoid "max_leases value not sane" warning by setting default
* to default_end_ip - default_start_ip + 1: */ * to default_end_ip - default_start_ip + 1: */
@@ -290,7 +86,7 @@ static const struct config_keyword keywords[] = {
{"min_lease", read_u32, &(server_config.min_lease_sec),"60"}, {"min_lease", read_u32, &(server_config.min_lease_sec),"60"},
{"lease_file", read_str, &(server_config.lease_file), LEASES_FILE}, {"lease_file", read_str, &(server_config.lease_file), LEASES_FILE},
{"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"}, {"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"},
{"siaddr", read_nip, &(server_config.siaddr_nip), "0.0.0.0"}, {"siaddr", udhcp_str2nip, &(server_config.siaddr_nip), "0.0.0.0"},
/* keywords with no defaults must be last! */ /* keywords with no defaults must be last! */
{"option", udhcp_str2optset, &(server_config.options), ""}, {"option", udhcp_str2optset, &(server_config.options), ""},
{"opt", udhcp_str2optset, &(server_config.options), ""}, {"opt", udhcp_str2optset, &(server_config.options), ""},

262
networking/udhcp/options.c
View File

@@ -1,262 +0,0 @@
/* vi: set sw=4 ts=4: */
/*
* options.c -- DHCP server option packet tools
* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#include "common.h"
/* Supported options are easily added here.
* See RFC2132 for more options.
* OPTION_REQ: these options are requested by udhcpc (unless -o).
*/
const struct dhcp_option dhcp_options[] = {
/* flags code */
{ OPTION_IP | OPTION_REQ, 0x01 }, /* DHCP_SUBNET */
{ OPTION_S32 , 0x02 }, /* DHCP_TIME_OFFSET */
{ OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03 }, /* DHCP_ROUTER */
// { OPTION_IP | OPTION_LIST , 0x04 }, /* DHCP_TIME_SERVER */
// { OPTION_IP | OPTION_LIST , 0x05 }, /* DHCP_NAME_SERVER */
{ OPTION_IP | OPTION_LIST | OPTION_REQ, 0x06 }, /* DHCP_DNS_SERVER */
// { 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_U16 , 0x0d }, /* DHCP_BOOT_SIZE */
{ OPTION_STRING | 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 */
{ OPTION_IP | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST */
{ OPTION_STRING , 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_U32 , 0x33 }, /* DHCP_LEASE_TIME */
{ 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 , 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 */
#endif
{ OPTION_STATIC_ROUTES , 0x79 }, /* DHCP_STATIC_ROUTES */
{ OPTION_STRING , 0xfc }, /* DHCP_WPAD */
/* Options below have no match in dhcp_option_strings[],
* are not passed to dhcpc scripts, and cannot be specified
* with "option XXX YYY" syntax in dhcpd config file.
* These entries are only used internally by udhcp[cd]
* to correctly encode options into packets.
*/
{ 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 */
{ 0, 0 } /* zeroed terminating entry */
};
/* Used for converting options from incoming packets to env variables
* 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 */
const char dhcp_option_strings[] ALIGN1 =
"subnet" "\0" /* DHCP_SUBNET */
"timezone" "\0" /* DHCP_TIME_OFFSET */
"router" "\0" /* DHCP_ROUTER */
// "timesrv" "\0" /* DHCP_TIME_SERVER */
// "namesrv" "\0" /* DHCP_NAME_SERVER */
"dns" "\0" /* DHCP_DNS_SERVER */
// "logsrv" "\0" /* DHCP_LOG_SERVER */
// "cookiesrv" "\0" /* DHCP_COOKIE_SERVER */
"lprsrv" "\0" /* DHCP_LPR_SERVER */
"hostname" "\0" /* DHCP_HOST_NAME */
"bootsize" "\0" /* DHCP_BOOT_SIZE */
"domain" "\0" /* DHCP_DOMAIN_NAME */
"swapsrv" "\0" /* DHCP_SWAP_SERVER */
"rootpath" "\0" /* DHCP_ROOT_PATH */
"ipttl" "\0" /* DHCP_IP_TTL */
"mtu" "\0" /* DHCP_MTU */
"broadcast" "\0" /* DHCP_BROADCAST */
"nisdomain" "\0" /* DHCP_NIS_DOMAIN */
"nissrv" "\0" /* DHCP_NIS_SERVER */
"ntpsrv" "\0" /* DHCP_NTP_SERVER */
"wins" "\0" /* DHCP_WINS_SERVER */
"lease" "\0" /* DHCP_LEASE_TIME */
"serverid" "\0" /* DHCP_SERVER_ID */
"message" "\0" /* DHCP_ERR_MESSAGE */
"tftp" "\0" /* DHCP_TFTP_SERVER_NAME */
"bootfile" "\0" /* DHCP_BOOT_FILE */
// "userclass" "\0" /* DHCP_USER_CLASS */
#if ENABLE_FEATURE_UDHCP_RFC3397
"search" "\0" /* DHCP_DOMAIN_SEARCH */
#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 */
;
/* Lengths of the different option types */
const uint8_t dhcp_option_lengths[] ALIGN1 = {
[OPTION_IP] = 4,
[OPTION_IP_PAIR] = 8,
[OPTION_BOOLEAN] = 1,
[OPTION_STRING] = 1,
#if ENABLE_FEATURE_UDHCP_RFC3397
[OPTION_STR1035] = 1,
#endif
[OPTION_U8] = 1,
[OPTION_U16] = 2,
[OPTION_S16] = 2,
[OPTION_U32] = 4,
[OPTION_S32] = 4,
/* Just like OPTION_STRING, we use minimum length here */
[OPTION_STATIC_ROUTES] = 5,
};
#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
static void log_option(const char *pfx, const uint8_t *opt)
{
if (dhcp_verbose >= 2) {
char buf[256 * 2 + 2];
*bin2hex(buf, (void*) (opt + OPT_DATA), opt[OPT_LEN]) = '\0';
bb_info_msg("%s: 0x%02x %s", pfx, opt[OPT_CODE], buf);
}
}
#else
# define log_option(pfx, opt) ((void)0)
#endif
/* 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;
int len;
int rem;
int overload = 0;
enum {
FILE_FIELD101 = FILE_FIELD * 0x101,
SNAME_FIELD101 = SNAME_FIELD * 0x101,
};
/* option bytes: [code][len][data1][data2]..[dataLEN] */
optionptr = packet->options;
rem = sizeof(packet->options);
while (1) {
if (rem <= 0) {
bb_error_msg("bad packet, malformed option field");
return NULL;
}
if (optionptr[OPT_CODE] == DHCP_PADDING) {
rem--;
optionptr++;
continue;
}
if (optionptr[OPT_CODE] == DHCP_END) {
if ((overload & FILE_FIELD101) == FILE_FIELD) {
/* can use packet->file, and didn't look at it yet */
overload |= FILE_FIELD101; /* "we looked at it" */
optionptr = packet->file;
rem = sizeof(packet->file);
continue;
}
if ((overload & SNAME_FIELD101) == SNAME_FIELD) {
/* can use packet->sname, and didn't look at it yet */
overload |= SNAME_FIELD101; /* "we looked at it" */
optionptr = packet->sname;
rem = sizeof(packet->sname);
continue;
}
break;
}
len = 2 + optionptr[OPT_LEN];
rem -= len;
if (rem < 0)
continue; /* complain and return NULL */
if (optionptr[OPT_CODE] == code) {
log_option("Option found", optionptr);
return optionptr + OPT_DATA;
}
if (optionptr[OPT_CODE] == DHCP_OPTION_OVERLOAD) {
overload |= optionptr[OPT_DATA];
/* fall through */
}
optionptr += len;
}
/* log3 because udhcpc uses it a lot - very noisy */
log3("Option 0x%02x not found", code);
return NULL;
}
/* return the position of the 'end' option (no bounds checking) */
int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
{
int i = 0;
while (optionptr[i] != DHCP_END) {
if (optionptr[i] != DHCP_PADDING)
i += optionptr[i + OPT_LEN] + OPT_DATA-1;
i++;
}
return i;
}
/* add an option string to the options */
/* option bytes: [code][len][data1][data2]..[dataLEN] */
void FAST_FUNC udhcp_add_option_string(uint8_t *optionptr, uint8_t *string)
{
unsigned len;
unsigned end = udhcp_end_option(optionptr);
/* end position + string length + option code/length + end option */
if (end + string[OPT_LEN] + 2 + 1 >= DHCP_OPTIONS_BUFSIZE) {
bb_error_msg("option 0x%02x did not fit into the packet",
string[OPT_CODE]);
return;
}
log_option("Adding option", string);
len = OPT_DATA + string[OPT_LEN];
memcpy(optionptr + end, string, len);
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)
{
const struct dhcp_option *dh;
for (dh = dhcp_options; dh->code; dh++) {
if (dh->code == code) {
uint8_t option[6], len;
option[OPT_CODE] = code;
len = dhcp_option_lengths[dh->flags & OPTION_TYPE_MASK];
option[OPT_LEN] = len;
if (BB_BIG_ENDIAN)
data <<= 8 * (4 - len);
/* Assignment is unaligned! */
move_to_unaligned32(&option[OPT_DATA], data);
udhcp_add_option_string(optionptr, option);
return;
}
}
bb_error_msg("can't add option 0x%02x", code);
}