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dhcp: heed TODO item - divorced options from their string descriptions

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code shrink while at it.

function                                             old     new   delta
dhcp_option_strings                                    -     258    +258
udhcp_run_script                                    1135    1174     +39
dhcp_option_lengths                                    -      11     +11
udhcp_add_simple_option                               93      92      -1
packet_num                                             4       -      -4
read_opt                                             746     739      -7
udhcp_option_lengths                                  11       -     -11
udhcpc_main                                         2590    2494     -96
dhcp_options                                         490      70    -420
------------------------------------------------------------------------------
(add/remove: 2/2 grow/shrink: 1/4 up/down: 308/-539)         Total: -231 bytes
   text    data     bss     dec     hex filename
 775309     929    9100  785338   bfbba busybox_old
 775098     929    9084  785111   bfad7 busybox_unstripped
This commit is contained in:
Denis Vlasenko 2007-11-29 08:17:45 +00:00
parent 64309f8669
commit b539c8452f
8 changed files with 135 additions and 88 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
networking/udhcp/common.h
View File

@ -77,7 +77,6 @@ void udhcp_run_script(struct dhcpMessage *packet, const char *name);
#define end_option udhcp_end_option
#define add_option_string udhcp_add_option_string
#define add_simple_option udhcp_add_simple_option
#define option_lengths udhcp_option_lengths
/* from socket.h */
#define listen_socket udhcp_listen_socket
#define read_interface udhcp_read_interface

24
networking/udhcp/dhcpc.c
View File

@ -19,15 +19,9 @@
#include "options.h"
/* Something is definitely wrong here. IPv4 addresses
* in variables of type long?? BTW, we use inet_ntoa()
* in the code. Manpage says that struct in_addr has a member of type long (!)
* which holds IPv4 address, and the struct is passed by value (!!)
*/
static int timeout; /* = 0. Must be signed */
static uint32_t requested_ip; /* = 0 */
static uint32_t server_addr;
static int packet_num; /* = 0 */
static int sockfd = -1;
#define LISTEN_NONE 0
@ -74,12 +68,6 @@ static void perform_renew(void)
case INIT_SELECTING:
break;
}
/* start things over */
packet_num = 0;
/* Kill any timeouts because the user wants this to hurry along */
timeout = 0;
}
@ -153,8 +141,11 @@ int udhcpc_main(int argc, char **argv)
int discover_retries = 3;
uint32_t xid = 0;
uint32_t lease_seconds = 0; /* can be given as 32-bit quantity */
unsigned t1 = 0, t2 = 0; /* what a wonderful names */
unsigned timestamp_got_lease = 0; /* for gcc */
int packet_num;
/* t1, t2... what a wonderful names... */
unsigned t1 = t1; /* for gcc */
unsigned t2 = t2;
unsigned timestamp_got_lease = timestamp_got_lease;
unsigned opt;
int max_fd;
int retval;
@ -315,6 +306,7 @@ int udhcpc_main(int argc, char **argv)
state = INIT_SELECTING;
udhcp_run_script(NULL, "deconfig");
change_listen_mode(LISTEN_RAW);
packet_num = 0;
/* Main event loop. select() waits on signal pipe and possibly
* on sockfd.
@ -585,6 +577,10 @@ int udhcpc_main(int argc, char **argv)
switch (signo) {
case SIGUSR1:
perform_renew();
/* start things over */
packet_num = 0;
/* Kill any timeouts because the user wants this to hurry along */
timeout = 0;
break;
case SIGUSR2:
perform_release();

2
networking/udhcp/dhcpd.h
View File

@ -100,7 +100,7 @@ int send_inform(struct dhcpMessage *oldpacket);
int read_config(const char *file);
void write_leases(void);
void read_leases(const char *file);
struct option_set *find_option(struct option_set *opt_list, char code);
struct option_set *find_option(struct option_set *opt_list, uint8_t code);
#endif

26
networking/udhcp/files.c
View File

@ -71,7 +71,7 @@ static int read_yn(const char *line, void *arg)
/* find option 'code' in opt_list */
struct option_set *find_option(struct option_set *opt_list, char code)
struct option_set *find_option(struct option_set *opt_list, uint8_t code)
{
while (opt_list && opt_list->data[OPT_CODE] < code)
opt_list = opt_list->next;
@ -154,31 +154,29 @@ static int read_opt(const char *const_line, void *arg)
{
struct option_set **opt_list = arg;
char *opt, *val, *endptr;
const struct dhcp_option *option;
int retval = 0, length;
char buffer[8];
char *line;
const struct dhcp_option *option;
int retval, length, idx;
char buffer[8] __attribute__((aligned(4)));
uint16_t *result_u16 = (uint16_t *) buffer;
uint32_t *result_u32 = (uint32_t *) buffer;
/* Cheat, the only const line we'll actually get is "" */
line = (char *) const_line;
opt = strtok(line, " \t=");
if (!opt) return 0;
option = dhcp_options;
while (1) {
if (!option->code)
if (!opt)
return 0;
if (!strcasecmp(option->opt_name, opt))
break;
option++;
}
idx = index_in_strings(opt, dhcp_option_strings); /* NB: was strcasecmp! */
if (idx < 0)
return 0;
option = &dhcp_options[idx];
retval = 0;
do {
val = strtok(NULL, ", \t");
if (!val) break;
length = option_lengths[option->flags & TYPE_MASK];
length = dhcp_option_lengths[option->flags & TYPE_MASK];
retval = 0;
opt = buffer; /* new meaning for variable opt */
switch (option->flags & TYPE_MASK) {

4
networking/udhcp/leases.c
View File

@ -98,7 +98,9 @@ struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr)
/* check is an IP is taken, if it is, add it to the lease table */
static int nobody_responds_to_arp(uint32_t addr)
{
static const uint8_t blank_chaddr[16]; /* 16 zero bytes */
/* 16 zero bytes */
static const uint8_t blank_chaddr[16] = { 0 };
/* = { 0 } helps gcc to put it in rodata, not bss */
struct in_addr temp;
int r;

138
networking/udhcp/options.c
View File

@ -11,54 +11,97 @@
/* Supported options are easily added here */
const struct dhcp_option dhcp_options[] = {
/* opt_name[12] flags code */
{"subnet", OPTION_IP | OPTION_REQ, 0x01}, /* DHCP_SUBNET */
{"timezone", OPTION_S32, 0x02}, /* DHCP_TIME_OFFSET */
{"router", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03}, /* DHCP_ROUTER */
{"timesvr", OPTION_IP | OPTION_LIST, 0x04}, /* DHCP_TIME_SERVER */
{"namesvr", OPTION_IP | OPTION_LIST, 0x05}, /* DHCP_NAME_SERVER */
{"dns", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x06}, /* DHCP_DNS_SERVER */
{"logsvr", OPTION_IP | OPTION_LIST, 0x07}, /* DHCP_LOG_SERVER */
{"cookiesvr", OPTION_IP | OPTION_LIST, 0x08}, /* DHCP_COOKIE_SERVER */
{"lprsvr", OPTION_IP | OPTION_LIST, 0x09}, /* DHCP_LPR_SERVER */
{"hostname", OPTION_STRING | OPTION_REQ, 0x0c}, /* DHCP_HOST_NAME */
{"bootsize", OPTION_U16, 0x0d}, /* DHCP_BOOT_SIZE */
{"domain", OPTION_STRING | OPTION_LIST | OPTION_REQ, 0x0f}, /* DHCP_DOMAIN_NAME */
{"swapsvr", OPTION_IP, 0x10}, /* DHCP_SWAP_SERVER */
{"rootpath", OPTION_STRING, 0x11}, /* DHCP_ROOT_PATH */
{"ipttl", OPTION_U8, 0x17}, /* DHCP_IP_TTL */
{"mtu", OPTION_U16, 0x1a}, /* DHCP_MTU */
{"broadcast", OPTION_IP | OPTION_REQ, 0x1c}, /* DHCP_BROADCAST */
{"nisdomain", OPTION_STRING | OPTION_REQ, 0x28}, /* DHCP_NTP_SERVER */
{"nissrv", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x29}, /* DHCP_WINS_SERVER */
{"ntpsrv", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a}, /* DHCP_REQUESTED_IP */
{"wins", OPTION_IP | OPTION_LIST, 0x2c}, /* DHCP_LEASE_TIME */
{"requestip", OPTION_IP, 0x32}, /* DHCP_OPTION_OVER */
{"lease", OPTION_U32, 0x33}, /* DHCP_MESSAGE_TYPE */
{"dhcptype", OPTION_U8, 0x35}, /* DHCP_SERVER_ID */
{"serverid", OPTION_IP, 0x36}, /* DHCP_PARAM_REQ */
{"message", OPTION_STRING, 0x38}, /* DHCP_MESSAGE */
// TODO: 1) some options should not be parsed & passed to script -
// maxsize sure should not, since it cannot appear in server responses!
// grep for opt_name is fix the mess.
// 2) Using fixed-sized char[] vector wastes space.
{"maxsize", OPTION_U16, 0x39}, /* DHCP_MAX_SIZE */
{"vendorclass", OPTION_STRING, 0x3C}, /* DHCP_VENDOR */
{"clientid", OPTION_STRING, 0x3D}, /* DHCP_CLIENT_ID */
{"tftp", OPTION_STRING, 0x42},
{"bootfile", OPTION_STRING, 0x43},
{"userclass", OPTION_STRING, 0x4D},
/* 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_LIST | 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 | OPTION_REQ, 0x28 }, /* DHCP_NTP_SERVER */
{ OPTION_IP | OPTION_LIST | OPTION_REQ, 0x29 }, /* DHCP_WINS_SERVER */
{ OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a }, /* DHCP_REQUESTED_IP */
{ OPTION_IP | OPTION_LIST, 0x2c }, /* DHCP_LEASE_TIME */
{ OPTION_IP, 0x32 }, /* DHCP_OPTION_OVER */
{ OPTION_U32, 0x33 }, /* DHCP_MESSAGE_TYPE */
{ OPTION_U8, 0x35 }, /* DHCP_SERVER_ID */
{ OPTION_IP, 0x36 }, /* DHCP_PARAM_REQ */
{ OPTION_STRING, 0x38 }, /* DHCP_MESSAGE */
{ OPTION_STRING, 0x3C }, /* DHCP_VENDOR */
{ OPTION_STRING, 0x3D }, /* DHCP_CLIENT_ID */
{ OPTION_STRING, 0x42 }, /* "tftp" */
{ OPTION_STRING, 0x43 }, /* "bootfile" */
{ OPTION_STRING, 0x4D }, /* "userclass" */
#if ENABLE_FEATURE_RFC3397
{"search", OPTION_STR1035 | OPTION_LIST | OPTION_REQ, 0x77},
{ OPTION_STR1035 | OPTION_LIST | OPTION_REQ, 0x77 }, /* "search" */
#endif
/* MSIE's "Web Proxy Autodiscovery Protocol" support */
{"wpad", OPTION_STRING, 0xfc},
{} /* zero-padded terminating entry */
{ OPTION_STRING, 0xfc }, /* "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. */
{ OPTION_U16, 0x39 }, /* DHCP_MAX_SIZE */
{ } /* zeroed terminating entry */
};
/* Used for converting options from incoming packets to env variables
* for udhcpc stript */
/* Must match dhcp_options[] order */
const char dhcp_option_strings[] ALIGN1 =
"subnet" "\0" /* DHCP_SUBNET */
"timezone" "\0" /* DHCP_TIME_OFFSET */
"router" "\0" /* DHCP_ROUTER */
"timesvr" "\0" /* DHCP_TIME_SERVER */
"namesvr" "\0" /* DHCP_NAME_SERVER */
"dns" "\0" /* DHCP_DNS_SERVER */
"logsvr" "\0" /* DHCP_LOG_SERVER */
"cookiesvr" "\0" /* DHCP_COOKIE_SERVER */
"lprsvr" "\0" /* DHCP_LPR_SERVER */
"hostname" "\0" /* DHCP_HOST_NAME */
"bootsize" "\0" /* DHCP_BOOT_SIZE */
"domain" "\0" /* DHCP_DOMAIN_NAME */
"swapsvr" "\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_NTP_SERVER */
"nissrv" "\0" /* DHCP_WINS_SERVER */
"ntpsrv" "\0" /* DHCP_REQUESTED_IP */
"wins" "\0" /* DHCP_LEASE_TIME */
"requestip" "\0" /* DHCP_OPTION_OVER */
"lease" "\0" /* DHCP_MESSAGE_TYPE */
"dhcptype" "\0" /* DHCP_SERVER_ID */
"serverid" "\0" /* DHCP_PARAM_REQ */
"message" "\0" /* DHCP_MESSAGE */
"vendorclass" "\0" /* DHCP_VENDOR */
"clientid" "\0" /* DHCP_CLIENT_ID */
"tftp" "\0"
"bootfile" "\0"
"userclass" "\0"
#if ENABLE_FEATURE_RFC3397
"search" "\0"
#endif
/* MSIE's "Web Proxy Autodiscovery Protocol" support */
"wpad" "\0"
;
/* Lengths of the different option types */
const unsigned char option_lengths[] ALIGN1 = {
const uint8_t dhcp_option_lengths[] ALIGN1 = {
[OPTION_IP] = 4,
[OPTION_IP_PAIR] = 8,
[OPTION_BOOLEAN] = 1,
@ -137,8 +180,10 @@ int end_option(uint8_t *optionptr)
int i = 0;
while (optionptr[i] != DHCP_END) {
if (optionptr[i] == DHCP_PADDING) i++;
else i += optionptr[i + OPT_LEN] + 2;
if (optionptr[i] == DHCP_PADDING)
i++;
else
i += optionptr[i + OPT_LEN] + 2;
}
return i;
}
@ -173,10 +218,11 @@ int add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data)
uint8_t option[6], len;
option[OPT_CODE] = code;
len = option_lengths[dh->flags & TYPE_MASK];
len = dhcp_option_lengths[dh->flags & TYPE_MASK];
option[OPT_LEN] = len;
if (BB_BIG_ENDIAN) data <<= 8 * (4 - len);
/* This memcpy is for broken processors which can't
if (BB_BIG_ENDIAN)
data <<= 8 * (4 - len);
/* This memcpy is for processors which can't
* handle a simple unaligned 32-bit assignment */
memcpy(&option[OPT_DATA], &data, 4);
return add_option_string(optionptr, option);

6
networking/udhcp/options.h
View File

@ -98,13 +98,13 @@ enum {
#define OPT_DATA 2
struct dhcp_option {
char opt_name[12];
char flags;
uint8_t flags;
uint8_t code;
};
extern const struct dhcp_option dhcp_options[];
extern const unsigned char option_lengths[];
extern const char dhcp_option_strings[];
extern const uint8_t dhcp_option_lengths[];
uint8_t *get_option(struct dhcpMessage *packet, int code);
int end_option(uint8_t *optionptr);

22
networking/udhcp/script.c
View File

@ -33,7 +33,7 @@ static const uint8_t max_option_length[] = {
static inline int upper_length(int length, int opt_index)
{
return max_option_length[opt_index] *
(length / option_lengths[opt_index]);
(length / dhcp_option_lengths[opt_index]);
}
@ -57,7 +57,7 @@ static int mton(uint32_t mask)
/* Allocate and fill with the text of option 'option'. */
static char *alloc_fill_opts(uint8_t *option, const struct dhcp_option *type_p)
static char *alloc_fill_opts(uint8_t *option, const struct dhcp_option *type_p, const char *opt_name)
{
int len, type, optlen;
uint16_t val_u16;
@ -68,10 +68,10 @@ static char *alloc_fill_opts(uint8_t *option, const struct dhcp_option *type_p)
len = option[OPT_LEN - 2];
type = type_p->flags & TYPE_MASK;
optlen = option_lengths[type];
optlen = dhcp_option_lengths[type];
dest = ret = xmalloc(upper_length(len, type) + strlen(type_p->opt_name) + 2);
dest += sprintf(ret, "%s=", type_p->opt_name);
dest = ret = xmalloc(upper_length(len, type) + strlen(opt_name) + 2);
dest += sprintf(ret, "%s=", opt_name);
for (;;) {
switch (type) {
@ -133,6 +133,7 @@ static char **fill_envp(struct dhcpMessage *packet)
int i, j;
char **envp;
char *var;
const char *opt_name;
uint8_t *temp;
char over = 0;
@ -171,11 +172,13 @@ static char **fill_envp(struct dhcpMessage *packet)
envp[j] = xmalloc(sizeof("ip=255.255.255.255"));
sprintip(envp[j++], "ip=", (uint8_t *) &packet->yiaddr);
for (i = 0; dhcp_options[i].code; i++) {
opt_name = dhcp_option_strings;
i = 0;
while (*opt_name) {
temp = get_option(packet, dhcp_options[i].code);
if (!temp)
continue;
envp[j++] = alloc_fill_opts(temp, &dhcp_options[i]);
goto next;
envp[j++] = alloc_fill_opts(temp, &dhcp_options[i], opt_name);
/* Fill in a subnet bits option for things like /24 */
if (dhcp_options[i].code == DHCP_SUBNET) {
@ -183,6 +186,9 @@ static char **fill_envp(struct dhcpMessage *packet)
memcpy(&subnet, temp, 4);
envp[j++] = xasprintf("mask=%d", mton(subnet));
}
next:
opt_name += strlen(opt_name) + 1;
i++;
}
if (packet->siaddr) {
envp[j] = xmalloc(sizeof("siaddr=255.255.255.255"));