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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2007-11-29 08:17:45 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2007-11-29 08:17:45 +0000
commitb539c8452f823a377bf629cf0e44ccda4a16c6c4 (patch)
treee131460f8227136ba2a76b1cc57efb491bd2f548 /networking
parent64309f8669f08f2c3c16a3b5bf82d9cae84ec388 (diff)
downloadbusybox-b539c8452f823a377bf629cf0e44ccda4a16c6c4.tar.gz
busybox-b539c8452f823a377bf629cf0e44ccda4a16c6c4.tar.bz2
dhcp: heed TODO item - divorced options from their string descriptions
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
Diffstat (limited to 'networking')
-rw-r--r--networking/udhcp/common.h1
-rw-r--r--networking/udhcp/dhcpc.c24
-rw-r--r--networking/udhcp/dhcpd.h2
-rw-r--r--networking/udhcp/files.c26
-rw-r--r--networking/udhcp/leases.c4
-rw-r--r--networking/udhcp/options.c138
-rw-r--r--networking/udhcp/options.h6
-rw-r--r--networking/udhcp/script.c22
8 files changed, 135 insertions, 88 deletions
diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index eecb72ca2..55782b51b 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -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
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index 6ade1ee34..d8077f7e8 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -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();
diff --git a/networking/udhcp/dhcpd.h b/networking/udhcp/dhcpd.h
index 28106d306..216b7ab64 100644
--- a/networking/udhcp/dhcpd.h
+++ b/networking/udhcp/dhcpd.h
@@ -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
diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c
index 5026598d7..63c90647d 100644
--- a/networking/udhcp/files.c
+++ b/networking/udhcp/files.c
@@ -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;
+ if (!opt)
+ return 0;
- option = dhcp_options;
- while (1) {
- if (!option->code)
- 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) {
diff --git a/networking/udhcp/leases.c b/networking/udhcp/leases.c
index 60e9edc68..1745fee03 100644
--- a/networking/udhcp/leases.c
+++ b/networking/udhcp/leases.c
@@ -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;
diff --git a/networking/udhcp/options.c b/networking/udhcp/options.c
index ffc0ed127..c224f3670 100644
--- a/networking/udhcp/options.c
+++ b/networking/udhcp/options.c
@@ -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);
diff --git a/networking/udhcp/options.h b/networking/udhcp/options.h
index 4bf73a17e..c98aec48f 100644
--- a/networking/udhcp/options.h
+++ b/networking/udhcp/options.h
@@ -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);
diff --git a/networking/udhcp/script.c b/networking/udhcp/script.c
index 33d96e687..8a188988e 100644
--- a/networking/udhcp/script.c
+++ b/networking/udhcp/script.c
@@ -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"));