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udhcp: merge options.h into common.h, script.c into dhcpc.c

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-03-22 14:29:13 +01:00
parent 8d1144565f
commit dde8bdcc5b
11 changed files with 490 additions and 536 deletions
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2
networking/udhcp/Kbuild
View File

@ -10,7 +10,7 @@ lib-y:=
lib-$(CONFIG_UDHCPC) += common.o options.o packet.o signalpipe.o socket.o
lib-$(CONFIG_UDHCPD) += common.o options.o packet.o signalpipe.o socket.o
lib-$(CONFIG_UDHCPC) += dhcpc.o script.o
lib-$(CONFIG_UDHCPC) += dhcpc.o
lib-$(CONFIG_UDHCPD) += dhcpd.o arpping.o files.o leases.o static_leases.o
lib-$(CONFIG_DUMPLEASES) += dumpleases.o
lib-$(CONFIG_DHCPRELAY) += dhcprelay.o

190
networking/udhcp/common.h
View File

@ -15,17 +15,14 @@
PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
#define DEFAULT_SCRIPT CONFIG_UDHCPC_DEFAULT_SCRIPT
extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */
/*** packet.h ***/
/*** DHCP packet ***/
/* DHCP protocol. See RFC 2131 */
#define DHCP_MAGIC 0x63825363
#define DHCP_OPTIONS_BUFSIZE 308
#define BOOTREQUEST 1
#define BOOTREPLY 2
@ -67,6 +64,116 @@ struct BUG_bad_sizeof_struct_ip_udp_dhcp_packet {
[(sizeof(struct ip_udp_dhcp_packet) != 576 + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS) ? -1 : 1];
};
/*** Options ***/
enum {
OPTION_IP = 1,
OPTION_IP_PAIR,
OPTION_STRING,
#if ENABLE_FEATURE_UDHCP_RFC3397
OPTION_STR1035, /* RFC1035 compressed domain name list */
#endif
OPTION_BOOLEAN,
OPTION_U8,
OPTION_U16,
OPTION_S16,
OPTION_U32,
OPTION_S32,
OPTION_STATIC_ROUTES,
OPTION_TYPE_MASK = 0x0f,
/* Client requests this option by default */
OPTION_REQ = 0x10,
/* There can be a list of 1 or more of these */
OPTION_LIST = 0x20,
};
/* DHCP option codes (partial list). See RFC 2132 and
* http://www.iana.org/assignments/bootp-dhcp-parameters/
* Commented out options are handled by common option machinery,
* uncommented ones have spacial cases (grep for them to see).
*/
#define DHCP_PADDING 0x00
#define DHCP_SUBNET 0x01
//#define DHCP_TIME_OFFSET 0x02 /* (localtime - UTC_time) in seconds. signed */
//#define DHCP_ROUTER 0x03
//#define DHCP_TIME_SERVER 0x04 /* RFC 868 time server (32-bit, 0 = 1.1.1900) */
//#define DHCP_NAME_SERVER 0x05 /* IEN 116 _really_ ancient kind of NS */
//#define DHCP_DNS_SERVER 0x06
//#define DHCP_LOG_SERVER 0x07 /* port 704 UDP log (not syslog)
//#define DHCP_COOKIE_SERVER 0x08 /* "quote of the day" server */
//#define DHCP_LPR_SERVER 0x09
#define DHCP_HOST_NAME 0x0c /* either client informs server or server gives name to client */
//#define DHCP_BOOT_SIZE 0x0d
//#define DHCP_DOMAIN_NAME 0x0f /* server gives domain suffix */
//#define DHCP_SWAP_SERVER 0x10
//#define DHCP_ROOT_PATH 0x11
//#define DHCP_IP_TTL 0x17
//#define DHCP_MTU 0x1a
//#define DHCP_BROADCAST 0x1c
//#define DHCP_NIS_DOMAIN 0x28
//#define DHCP_NIS_SERVER 0x29
//#define DHCP_NTP_SERVER 0x2a
//#define DHCP_WINS_SERVER 0x2c
#define DHCP_REQUESTED_IP 0x32 /* sent by client if specific IP is wanted */
#define DHCP_LEASE_TIME 0x33
#define DHCP_OPTION_OVERLOAD 0x34
#define DHCP_MESSAGE_TYPE 0x35
#define DHCP_SERVER_ID 0x36 /* by default server's IP */
#define DHCP_PARAM_REQ 0x37 /* list of options client wants */
//#define DHCP_ERR_MESSAGE 0x38 /* error message when sending NAK etc */
#define DHCP_MAX_SIZE 0x39
#define DHCP_VENDOR 0x3c /* client's vendor (a string) */
#define DHCP_CLIENT_ID 0x3d /* by default client's MAC addr, but may be arbitrarily long */
//#define DHCP_TFTP_SERVER_NAME 0x42 /* same as 'sname' field */
//#define DHCP_BOOT_FILE 0x43 /* same as 'file' field */
//#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_STATIC_ROUTES 0x79 /* RFC 3442. (mask,ip,router) tuples */
//#define DHCP_WPAD 0xfc /* MSIE's Web Proxy Autodiscovery Protocol */
#define DHCP_END 0xff
/* Offsets in option byte sequence */
#define OPT_CODE 0
#define OPT_LEN 1
#define OPT_DATA 2
/* Bits in "overload" option */
#define OPTION_FIELD 0
#define FILE_FIELD 1
#define SNAME_FIELD 2
/* DHCP_MESSAGE_TYPE values */
#define DHCPDISCOVER 1 /* client -> server */
#define DHCPOFFER 2 /* client <- server */
#define DHCPREQUEST 3 /* client -> server */
#define DHCPDECLINE 4 /* client -> server */
#define DHCPACK 5 /* client <- server */
#define DHCPNAK 6 /* client <- server */
#define DHCPRELEASE 7 /* client -> server */
#define DHCPINFORM 8 /* client -> server */
#define DHCP_MINTYPE DHCPDISCOVER
#define DHCP_MAXTYPE DHCPINFORM
struct dhcp_option {
uint8_t flags;
uint8_t code;
};
extern const struct dhcp_option dhcp_options[];
extern const char dhcp_option_strings[];
extern const uint8_t dhcp_option_lengths[];
uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) 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_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) FAST_FUNC;
#if ENABLE_FEATURE_UDHCP_RFC3397
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;
#endif
// RFC 2131 Table 5: Fields and options used by DHCP clients
//
// Field DHCPDISCOVER DHCPREQUEST DHCPDECLINE,
@ -132,45 +239,7 @@ struct BUG_bad_sizeof_struct_ip_udp_dhcp_packet {
// All others MAY MAY MUST NOT
uint16_t udhcp_checksum(void *addr, int count) FAST_FUNC;
void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC;
int udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd) FAST_FUNC;
int udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
uint32_t source_ip, int source_port,
uint32_t dest_ip, int dest_port, const uint8_t *dest_arp,
int ifindex) FAST_FUNC;
int udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
uint32_t source_ip, int source_port,
uint32_t dest_ip, int dest_port) FAST_FUNC;
/**/
void udhcp_run_script(struct dhcp_packet *packet, const char *name) FAST_FUNC;
// Still need to clean these up...
/* from options.h */
#define get_option udhcp_get_option
#define end_option udhcp_end_option
#define add_option_string udhcp_add_option_string
#define add_simple_option udhcp_add_simple_option
void udhcp_sp_setup(void) FAST_FUNC;
int udhcp_sp_fd_set(fd_set *rfds, int extra_fd) FAST_FUNC;
int udhcp_sp_read(const fd_set *rfds) FAST_FUNC;
int udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac) FAST_FUNC;
int udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf) FAST_FUNC;
/* Returns 1 if no reply received */
int arpping(uint32_t test_nip,
const uint8_t *safe_mac,
uint32_t from_ip,
uint8_t *from_mac,
const char *interface) FAST_FUNC;
/*** Logging ***/
#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
extern unsigned dhcp_verbose;
@ -194,6 +263,39 @@ void udhcp_dump_packet(struct dhcp_packet *packet) FAST_FUNC;
# define log3(...) ((void)0)
#endif
/*** Other shared functions ***/
uint16_t udhcp_checksum(void *addr, int count) FAST_FUNC;
void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC;
int udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd) FAST_FUNC;
int udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
uint32_t source_ip, int source_port,
uint32_t dest_ip, int dest_port, const uint8_t *dest_arp,
int ifindex) FAST_FUNC;
int udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
uint32_t source_ip, int source_port,
uint32_t dest_ip, int dest_port) FAST_FUNC;
void udhcp_sp_setup(void) FAST_FUNC;
int udhcp_sp_fd_set(fd_set *rfds, int extra_fd) FAST_FUNC;
int udhcp_sp_read(const fd_set *rfds) FAST_FUNC;
int udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac) FAST_FUNC;
int udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf) FAST_FUNC;
/* Returns 1 if no reply received */
int arpping(uint32_t test_nip,
const uint8_t *safe_mac,
uint32_t from_ip,
uint8_t *from_mac,
const char *interface) FAST_FUNC;
POP_SAVED_FUNCTION_VISIBILITY
#endif

376
networking/udhcp/dhcpc.c
View File

@ -24,7 +24,6 @@
#include "common.h"
#include "dhcpd.h"
#include "dhcpc.h"
#include "options.h"
#include <asm/types.h>
#if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined(_NEWLIB_VERSION)
@ -36,34 +35,278 @@
#endif
#include <linux/filter.h>
static int sockfd = -1;
#define LISTEN_NONE 0
#define LISTEN_KERNEL 1
#define LISTEN_RAW 2
static smallint listen_mode;
/* initial state: (re)start DHCP negotiation */
#define INIT_SELECTING 0
/* discover was sent, DHCPOFFER reply received */
#define REQUESTING 1
/* select/renew was sent, DHCPACK reply received */
#define BOUND 2
/* half of lease passed, want to renew it by sending unicast renew requests */
#define RENEWING 3
/* renew requests were not answered, lease is almost over, send broadcast renew */
#define REBINDING 4
/* manually requested renew (SIGUSR1) */
#define RENEW_REQUESTED 5
/* release, possibly manually requested (SIGUSR2) */
#define RELEASED 6
static smallint state;
/* struct client_config_t client_config is in bb_common_bufsiz1 */
/* Create a random xid */
/*** Script execution code ***/
/* 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,
#if ENABLE_FEATURE_UDHCP_RFC3397
[OPTION_STR1035] = 1,
#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 "),
};
/* note: ip is a pointer to an IP in network order, possibly misaliged */
static int sprint_nip(char *dest, const char *pre, const uint8_t *ip)
{
return sprintf(dest, "%s%u.%u.%u.%u", pre, ip[0], ip[1], ip[2], ip[3]);
}
/* really simple implementation, just count the bits */
static int mton(uint32_t mask)
{
int i = 0;
mask = ntohl(mask); /* 111110000-like bit pattern */
while (mask) {
i++;
mask <<= 1;
}
return i;
}
/* Create "opt_name=opt_value" string */
static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_option *type_p, const char *opt_name)
{
unsigned upper_length;
int len, type, optlen;
uint16_t val_u16;
int16_t val_s16;
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);
dest = ret = xmalloc(upper_length + strlen(opt_name) + 2);
dest += sprintf(ret, "%s=", opt_name);
while (len >= optlen) {
switch (type) {
case OPTION_IP_PAIR:
dest += sprint_nip(dest, "", option);
*dest++ = '/';
option += 4;
optlen = 4;
case OPTION_IP:
dest += sprint_nip(dest, "", option);
// TODO: it can be a list only if (type_p->flags & OPTION_LIST).
// Should we bail out/warn if we see multi-ip option which is
// not allowed to be such? For example, DHCP_BROADCAST...
break;
case OPTION_BOOLEAN:
dest += sprintf(dest, *option ? "yes" : "no");
break;
case OPTION_U8:
dest += sprintf(dest, "%u", *option);
break;
case OPTION_U16:
move_from_unaligned16(val_u16, option);
dest += sprintf(dest, "%u", ntohs(val_u16));
break;
case OPTION_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));
break;
case OPTION_STRING:
memcpy(dest, option, len);
dest[len] = '\0';
return ret; /* Short circuit this case */
case OPTION_STATIC_ROUTES: {
/* Option binary format:
* mask [one byte, 0..32]
* ip [big endian, 0..4 bytes depending on mask]
* router [big endian, 4 bytes]
* may be repeated
*
* We convert it to a string "IP/MASK ROUTER IP2/MASK2 ROUTER2"
*/
const char *pfx = "";
while (len >= 1 + 4) { /* mask + 0-byte ip + router */
uint32_t nip;
uint8_t *p;
unsigned mask;
int bytes;
mask = *option++;
if (mask > 32)
break;
len--;
nip = 0;
p = (void*) &nip;
bytes = (mask + 7) / 8; /* 0 -> 0, 1..8 -> 1, 9..16 -> 2 etc */
while (--bytes >= 0) {
*p++ = *option++;
len--;
}
if (len < 4)
break;
/* print ip/mask */
dest += sprint_nip(dest, pfx, (void*) &nip);
pfx = " ";
dest += sprintf(dest, "/%u ", mask);
/* print router */
dest += sprint_nip(dest, "", option);
option += 4;
len -= 4;
}
return ret;
}
#if ENABLE_FEATURE_UDHCP_RFC3397
case OPTION_STR1035:
/* unpack option into dest; use ret for prefix (i.e., "optname=") */
dest = dname_dec(option, len, ret);
if (dest) {
free(ret);
return dest;
}
/* error. return "optname=" string */
return ret;
#endif
}
option += optlen;
len -= optlen;
if (len <= 0)
break;
*dest++ = ' ';
*dest = '\0';
}
return ret;
}
/* put all the parameters into the environment */
static char **fill_envp(struct dhcp_packet *packet)
{
int num_options = 0;
int i;
char **envp, **curr;
const char *opt_name;
uint8_t *temp;
uint8_t over = 0;
if (packet) {
for (i = 0; dhcp_options[i].code; i++) {
if (udhcp_get_option(packet, dhcp_options[i].code)) {
num_options++;
if (dhcp_options[i].code == DHCP_SUBNET)
num_options++; /* for mton */
}
}
if (packet->siaddr_nip)
num_options++;
temp = udhcp_get_option(packet, DHCP_OPTION_OVERLOAD);
if (temp)
over = *temp;
if (!(over & FILE_FIELD) && packet->file[0])
num_options++;
if (!(over & SNAME_FIELD) && packet->sname[0])
num_options++;
}
curr = envp = xzalloc(sizeof(char *) * (num_options + 3));
*curr = xasprintf("interface=%s", client_config.interface);
putenv(*curr++);
if (packet == NULL)
return envp;
*curr = xmalloc(sizeof("ip=255.255.255.255"));
sprint_nip(*curr, "ip=", (uint8_t *) &packet->yiaddr);
putenv(*curr++);
opt_name = dhcp_option_strings;
i = 0;
while (*opt_name) {
temp = udhcp_get_option(packet, dhcp_options[i].code);
if (!temp)
goto next;
*curr = xmalloc_optname_optval(temp, &dhcp_options[i], opt_name);
putenv(*curr++);
/* Fill in a subnet bits option for things like /24 */
if (dhcp_options[i].code == DHCP_SUBNET) {
uint32_t subnet;
move_from_unaligned32(subnet, temp);
*curr = xasprintf("mask=%d", mton(subnet));
putenv(*curr++);
}
next:
opt_name += strlen(opt_name) + 1;
i++;
}
if (packet->siaddr_nip) {
*curr = xmalloc(sizeof("siaddr=255.255.255.255"));
sprint_nip(*curr, "siaddr=", (uint8_t *) &packet->siaddr_nip);
putenv(*curr++);
}
if (!(over & FILE_FIELD) && packet->file[0]) {
/* watch out for invalid packets */
*curr = xasprintf("boot_file=%."DHCP_PKT_FILE_LEN_STR"s", packet->file);
putenv(*curr++);
}
if (!(over & SNAME_FIELD) && packet->sname[0]) {
/* watch out for invalid packets */
*curr = xasprintf("sname=%."DHCP_PKT_SNAME_LEN_STR"s", packet->sname);
putenv(*curr++);
}
return envp;
}
/* Call a script with a par file and env vars */
static void udhcp_run_script(struct dhcp_packet *packet, const char *name)
{
char **envp, **curr;
char *argv[3];
if (client_config.script == NULL)
return;
envp = fill_envp(packet);
/* call script */
log1("Executing %s %s", client_config.script, name);
argv[0] = (char*) client_config.script;
argv[1] = (char*) name;
argv[2] = NULL;
spawn_and_wait(argv);
for (curr = envp; *curr; curr++) {
log2(" %s", *curr);
bb_unsetenv(*curr);
free(*curr);
}
free(envp);
}
/*** Sending/receiving packets ***/
static ALWAYS_INLINE uint32_t random_xid(void)
{
return rand();
@ -75,16 +318,16 @@ static void init_packet(struct dhcp_packet *packet, char type)
udhcp_init_header(packet, type);
memcpy(packet->chaddr, client_config.client_mac, 6);
if (client_config.clientid)
add_option_string(packet->options, client_config.clientid);
udhcp_add_option_string(packet->options, client_config.clientid);
if (client_config.hostname)
add_option_string(packet->options, client_config.hostname);
udhcp_add_option_string(packet->options, client_config.hostname);
if (client_config.fqdn)
add_option_string(packet->options, client_config.fqdn);
udhcp_add_option_string(packet->options, client_config.fqdn);
if (type != DHCPDECLINE
&& type != DHCPRELEASE
&& client_config.vendorclass
) {
add_option_string(packet->options, client_config.vendorclass);
udhcp_add_option_string(packet->options, client_config.vendorclass);
}
}
@ -94,7 +337,7 @@ static void init_packet(struct dhcp_packet *packet, char type)
static void add_param_req_option(struct dhcp_packet *packet)
{
uint8_t c;
int end = end_option(packet->options);
int end = udhcp_end_option(packet->options);
int i, len = 0;
for (i = 0; (c = dhcp_options[i].code) != 0; i++) {
@ -148,10 +391,10 @@ static int send_discover(uint32_t xid, uint32_t requested)
init_packet(&packet, DHCPDISCOVER);
packet.xid = xid;
if (requested)
add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
udhcp_add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
/* Explicitly saying that we want RFC-compliant packets helps
* some buggy DHCP servers to NOT send bigger packets */
add_simple_option(packet.options, DHCP_MAX_SIZE, htons(576));
udhcp_add_simple_option(packet.options, DHCP_MAX_SIZE, htons(576));
add_param_req_option(&packet);
bb_info_msg("Sending discover...");
@ -169,8 +412,8 @@ static int send_select(uint32_t xid, uint32_t server, uint32_t requested)
init_packet(&packet, DHCPREQUEST);
packet.xid = xid;
add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
add_simple_option(packet.options, DHCP_SERVER_ID, server);
udhcp_add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
udhcp_add_simple_option(packet.options, DHCP_SERVER_ID, server);
add_param_req_option(&packet);
addr.s_addr = requested;
@ -204,8 +447,8 @@ static int send_decline(uint32_t xid, uint32_t server, uint32_t requested)
init_packet(&packet, DHCPDECLINE);
packet.xid = xid;
add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
add_simple_option(packet.options, DHCP_SERVER_ID, server);
udhcp_add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
udhcp_add_simple_option(packet.options, DHCP_SERVER_ID, server);
bb_info_msg("Sending decline...");
return raw_bcast_from_client_config_ifindex(&packet);
@ -221,7 +464,7 @@ static int send_release(uint32_t server, uint32_t ciaddr)
packet.xid = random_xid();
packet.ciaddr = ciaddr;
add_simple_option(packet.options, DHCP_SERVER_ID, server);
udhcp_add_simple_option(packet.options, DHCP_SERVER_ID, server);
bb_info_msg("Sending release...");
return udhcp_send_kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);
@ -297,6 +540,32 @@ static NOINLINE int udhcp_recv_raw_packet(struct dhcp_packet *dhcp_pkt, int fd)
return bytes - (sizeof(packet.ip) + sizeof(packet.udp));
}
/*** Main ***/
static int sockfd = -1;
#define LISTEN_NONE 0
#define LISTEN_KERNEL 1
#define LISTEN_RAW 2
static smallint listen_mode;
/* initial state: (re)start DHCP negotiation */
#define INIT_SELECTING 0
/* discover was sent, DHCPOFFER reply received */
#define REQUESTING 1
/* select/renew was sent, DHCPACK reply received */
#define BOUND 2
/* half of lease passed, want to renew it by sending unicast renew requests */
#define RENEWING 3
/* renew requests were not answered, lease is almost over, send broadcast renew */
#define REBINDING 4
/* manually requested renew (SIGUSR1) */
#define RENEW_REQUESTED 5
/* release, possibly manually requested (SIGUSR2) */
#define RELEASED 6
static smallint state;
static int udhcp_raw_socket(int ifindex)
{
int fd;
@ -368,7 +637,6 @@ static int udhcp_raw_socket(int ifindex)
return fd;
}
/* just a little helper */
static void change_listen_mode(int new_mode)
{
log1("Entering listen mode: %s",
@ -389,7 +657,6 @@ static void change_listen_mode(int new_mode)
/* else LISTEN_NONE: sockfd stays closed */
}
/* perform a renew */
static void perform_renew(void)
{
bb_info_msg("Performing a DHCP renew");
@ -412,7 +679,6 @@ static void perform_renew(void)
}
}
/* perform a release */
static void perform_release(uint32_t requested_ip, uint32_t server_addr)
{
char buffer[sizeof("255.255.255.255")];
@ -434,16 +700,6 @@ static void perform_release(uint32_t requested_ip, uint32_t server_addr)
state = RELEASED;
}
#if BB_MMU
static void client_background(void)
{
bb_daemonize(0);
logmode &= ~LOGMODE_STDIO;
/* rewrite pidfile, as our pid is different now */
write_pidfile(client_config.pidfile);
}
#endif
static uint8_t* alloc_dhcp_option(int code, const char *str, int extra)
{
uint8_t *storage;
@ -455,6 +711,16 @@ static uint8_t* alloc_dhcp_option(int code, const char *str, int extra)
return storage;
}
#if BB_MMU
static void client_background(void)
{
bb_daemonize(0);
logmode &= ~LOGMODE_STDIO;
/* rewrite pidfile, as our pid is different now */
write_pidfile(client_config.pidfile);
}
#endif
int udhcpc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int udhcpc_main(int argc UNUSED_PARAM, char **argv)
{
@ -541,7 +807,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
IF_FEATURE_UDHCP_PORT(SERVER_PORT = 67;)
IF_FEATURE_UDHCP_PORT(CLIENT_PORT = 68;)
client_config.interface = "eth0";
client_config.script = DEFAULT_SCRIPT;
client_config.script = CONFIG_UDHCPC_DEFAULT_SCRIPT;
str_V = "udhcp "BB_VER;
/* Parse command line */
@ -861,7 +1127,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
continue;
}
message = get_option(&packet, DHCP_MESSAGE_TYPE);
message = udhcp_get_option(&packet, DHCP_MESSAGE_TYPE);
if (message == NULL) {
bb_error_msg("no message type option, ignoring packet");
continue;
@ -872,7 +1138,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
/* Must be a DHCPOFFER to one of our xid's */
if (*message == DHCPOFFER) {
/* TODO: why we don't just fetch server's IP from IP header? */
temp = get_option(&packet, DHCP_SERVER_ID);
temp = udhcp_get_option(&packet, DHCP_SERVER_ID);
if (!temp) {
bb_error_msg("no server ID in message");
continue;
@ -895,7 +1161,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
case RENEW_REQUESTED:
case REBINDING:
if (*message == DHCPACK) {
temp = get_option(&packet, DHCP_LEASE_TIME);
temp = udhcp_get_option(&packet, DHCP_LEASE_TIME);
if (!temp) {
bb_error_msg("no lease time with ACK, using 1 hour lease");
lease_seconds = 60 * 60;

23
networking/udhcp/dhcpd.c
View File

@ -25,7 +25,6 @@
#include "common.h"
#include "dhcpc.h"
#include "dhcpd.h"
#include "options.h"
/* Send a packet to a specific mac address and ip address by creating our own ip packet */
@ -94,7 +93,7 @@ static void init_packet(struct dhcp_packet *packet, struct dhcp_packet *oldpacke
packet->flags = oldpacket->flags;
packet->gateway_nip = oldpacket->gateway_nip;
packet->ciaddr = oldpacket->ciaddr;
add_simple_option(packet->options, DHCP_SERVER_ID, server_config.server_nip);
udhcp_add_simple_option(packet->options, DHCP_SERVER_ID, server_config.server_nip);
}
/* Fill options field, siaddr_nip, and sname and boot_file fields.
@ -106,7 +105,7 @@ static void add_server_options(struct dhcp_packet *packet)
while (curr) {
if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
add_option_string(packet->options, curr->data);
udhcp_add_option_string(packet->options, curr->data);
curr = curr->next;
}
@ -121,7 +120,7 @@ static void add_server_options(struct dhcp_packet *packet)
static uint32_t select_lease_time(struct dhcp_packet *packet)
{
uint32_t lease_time_sec = server_config.max_lease_sec;
uint8_t *lease_time_opt = get_option(packet, DHCP_LEASE_TIME);
uint8_t *lease_time_opt = udhcp_get_option(packet, DHCP_LEASE_TIME);
if (lease_time_opt) {
move_from_unaligned32(lease_time_sec, lease_time_opt);
lease_time_sec = ntohl(lease_time_sec);
@ -159,7 +158,7 @@ static void send_offer(struct dhcp_packet *oldpacket, uint32_t static_lease_nip,
packet.yiaddr = lease->lease_nip;
}
/* Or: if client has requested an IP */
else if ((req_ip_opt = get_option(oldpacket, DHCP_REQUESTED_IP)) != NULL
else if ((req_ip_opt = udhcp_get_option(oldpacket, DHCP_REQUESTED_IP)) != NULL
/* (read IP) */
&& (move_from_unaligned32(req_nip, req_ip_opt), 1)
/* and the IP is in the lease range */
@ -182,7 +181,7 @@ static void send_offer(struct dhcp_packet *oldpacket, uint32_t static_lease_nip,
return;
}
/* Reserve the IP for a short time hoping to get DHCPREQUEST soon */
p_host_name = (const char*) get_option(oldpacket, DHCP_HOST_NAME);
p_host_name = (const char*) udhcp_get_option(oldpacket, DHCP_HOST_NAME);
lease = add_lease(packet.chaddr, packet.yiaddr,
server_config.offer_time,
p_host_name,
@ -195,7 +194,7 @@ static void send_offer(struct dhcp_packet *oldpacket, uint32_t static_lease_nip,
}
lease_time_sec = select_lease_time(oldpacket);
add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec));
udhcp_add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec));
add_server_options(&packet);
addr.s_addr = packet.yiaddr;
@ -225,7 +224,7 @@ static void send_ACK(struct dhcp_packet *oldpacket, uint32_t yiaddr)
packet.yiaddr = yiaddr;
lease_time_sec = select_lease_time(oldpacket);
add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec));
udhcp_add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec));
add_server_options(&packet);
@ -233,7 +232,7 @@ static void send_ACK(struct dhcp_packet *oldpacket, uint32_t yiaddr)
bb_info_msg("Sending ACK to %s", inet_ntoa(addr));
send_packet(&packet, /*force_bcast:*/ 0);
p_host_name = (const char*) get_option(oldpacket, DHCP_HOST_NAME);
p_host_name = (const char*) udhcp_get_option(oldpacket, DHCP_HOST_NAME);
add_lease(packet.chaddr, packet.yiaddr,
lease_time_sec,
p_host_name,
@ -422,7 +421,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
bb_error_msg("not a REQUEST, ignoring packet");
continue;
}
state = get_option(&packet, DHCP_MESSAGE_TYPE);
state = udhcp_get_option(&packet, DHCP_MESSAGE_TYPE);
if (state == NULL || state[0] < DHCP_MINTYPE || state[0] > DHCP_MAXTYPE) {
bb_error_msg("no or bad message type option, ignoring packet");
continue;
@ -441,7 +440,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
}
/* Get REQUESTED_IP and SERVER_ID if present */
server_id_opt = get_option(&packet, DHCP_SERVER_ID);
server_id_opt = udhcp_get_option(&packet, DHCP_SERVER_ID);
if (server_id_opt) {
uint32_t server_id_net;
move_from_unaligned32(server_id_net, server_id_opt);
@ -451,7 +450,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
continue;
}
}
requested_opt = get_option(&packet, DHCP_REQUESTED_IP);
requested_opt = udhcp_get_option(&packet, DHCP_REQUESTED_IP);
if (requested_opt) {
move_from_unaligned32(requested_nip, requested_opt);
}

3
networking/udhcp/dhcprelay.c
View File

@ -11,7 +11,6 @@
*/
#include "common.h"
#include "options.h"
#define SERVER_PORT 67
#define SELECT_TIMEOUT 5 /* select timeout in sec. */
@ -105,7 +104,7 @@ static int get_dhcp_packet_type(struct dhcp_packet *p)
if (p->op != BOOTREQUEST && p->op != BOOTREPLY)
return -1;
/* get message type option */
op = get_option(p, DHCP_MESSAGE_TYPE);
op = udhcp_get_option(p, DHCP_MESSAGE_TYPE);
if (op != NULL)
return op[0];
return -1;

1
networking/udhcp/domain_codec.c
View File

@ -10,7 +10,6 @@
#if ENABLE_FEATURE_UDHCP_RFC3397
#include "common.h"
#include "options.h"
#define NS_MAXDNAME 1025 /* max domain name length */
#define NS_MAXCDNAME 255 /* max compressed domain name length */

1
networking/udhcp/files.c
View File

@ -10,7 +10,6 @@
#include "common.h"
#include "dhcpd.h"
#include "options.h"
#if BB_LITTLE_ENDIAN
static inline uint64_t hton64(uint64_t v)

21
networking/udhcp/options.c
View File

@ -7,8 +7,6 @@
*/
#include "common.h"
#include "dhcpd.h"
#include "options.h"
/* Supported options are easily added here.
@ -111,7 +109,6 @@ const char dhcp_option_strings[] ALIGN1 =
"wpad" "\0" /* DHCP_WPAD */
;
/* Lengths of the different option types */
const uint8_t dhcp_option_lengths[] ALIGN1 = {
[OPTION_IP] = 4,
@ -144,9 +141,8 @@ static void log_option(const char *pfx, const uint8_t *opt)
# define log_option(pfx, opt) ((void)0)
#endif
/* get an option with bounds checking (warning, result is not aligned). */
uint8_t* FAST_FUNC get_option(struct dhcp_packet *packet, int code)
uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
{
uint8_t *optionptr;
int len;
@ -162,7 +158,7 @@ uint8_t* FAST_FUNC get_option(struct dhcp_packet *packet, int code)
rem = sizeof(packet->options);
while (1) {
if (rem <= 0) {
bb_error_msg("bogus packet, malformed option field");
bb_error_msg("bad packet, malformed option field");
return NULL;
}
if (optionptr[OPT_CODE] == DHCP_PADDING) {
@ -209,9 +205,8 @@ uint8_t* FAST_FUNC get_option(struct dhcp_packet *packet, int code)
return NULL;
}
/* return the position of the 'end' option (no bounds checking) */
int FAST_FUNC end_option(uint8_t *optionptr)
int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
{
int i = 0;
@ -223,12 +218,11 @@ int FAST_FUNC end_option(uint8_t *optionptr)
return i;
}
/* add an option string to the options */
/* option bytes: [code][len][data1][data2]..[dataLEN] */
void FAST_FUNC add_option_string(uint8_t *optionptr, uint8_t *string)
void FAST_FUNC udhcp_add_option_string(uint8_t *optionptr, uint8_t *string)
{
int end = end_option(optionptr);
int end = udhcp_end_option(optionptr);
/* end position + string length + option code/length + end option */
if (end + string[OPT_LEN] + 2 + 1 >= DHCP_OPTIONS_BUFSIZE) {
@ -241,9 +235,8 @@ void FAST_FUNC add_option_string(uint8_t *optionptr, uint8_t *string)
optionptr[end + string[OPT_LEN] + 2] = DHCP_END;
}
/* add a one to four byte option to a packet */
void FAST_FUNC add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data)
void FAST_FUNC udhcp_add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data)
{
const struct dhcp_option *dh;
@ -258,7 +251,7 @@ void FAST_FUNC add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data
data <<= 8 * (4 - len);
/* Assignment is unaligned! */
move_to_unaligned32(&option[OPT_DATA], data);
add_option_string(optionptr, option);
udhcp_add_option_string(optionptr, option);
return;
}
}

119
networking/udhcp/options.h
View File

@ -1,119 +0,0 @@
/* vi: set sw=4 ts=4: */
/* options.h */
#ifndef UDHCP_OPTIONS_H
#define UDHCP_OPTIONS_H 1
PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
enum {
OPTION_IP = 1,
OPTION_IP_PAIR,
OPTION_STRING,
#if ENABLE_FEATURE_UDHCP_RFC3397
OPTION_STR1035, /* RFC1035 compressed domain name list */
#endif
OPTION_BOOLEAN,
OPTION_U8,
OPTION_U16,
OPTION_S16,
OPTION_U32,
OPTION_S32,
OPTION_STATIC_ROUTES,
OPTION_TYPE_MASK = 0x0f,
/* Client requests this option by default */
OPTION_REQ = 0x10,
/* There can be a list of 1 or more of these */
OPTION_LIST = 0x20,
};
/* DHCP option codes (partial list). See RFC 2132 and
* http://www.iana.org/assignments/bootp-dhcp-parameters/
* Commented out options are handled by common option machinery,
* uncommented ones have spacial cases (grep for them to see).
*/
#define DHCP_PADDING 0x00
#define DHCP_SUBNET 0x01
//#define DHCP_TIME_OFFSET 0x02 /* (localtime - UTC_time) in seconds. signed */
//#define DHCP_ROUTER 0x03
//#define DHCP_TIME_SERVER 0x04 /* RFC 868 time server (32-bit, 0 = 1.1.1900) */
//#define DHCP_NAME_SERVER 0x05 /* IEN 116 _really_ ancient kind of NS */
//#define DHCP_DNS_SERVER 0x06
//#define DHCP_LOG_SERVER 0x07 /* port 704 UDP log (not syslog)
//#define DHCP_COOKIE_SERVER 0x08 /* "quote of the day" server */
//#define DHCP_LPR_SERVER 0x09
#define DHCP_HOST_NAME 0x0c /* either client informs server or server gives name to client */
//#define DHCP_BOOT_SIZE 0x0d
//#define DHCP_DOMAIN_NAME 0x0f /* server gives domain suffix */
//#define DHCP_SWAP_SERVER 0x10
//#define DHCP_ROOT_PATH 0x11
//#define DHCP_IP_TTL 0x17
//#define DHCP_MTU 0x1a
//#define DHCP_BROADCAST 0x1c
//#define DHCP_NIS_DOMAIN 0x28
//#define DHCP_NIS_SERVER 0x29
//#define DHCP_NTP_SERVER 0x2a
//#define DHCP_WINS_SERVER 0x2c
#define DHCP_REQUESTED_IP 0x32 /* sent by client if specific IP is wanted */
#define DHCP_LEASE_TIME 0x33
#define DHCP_OPTION_OVERLOAD 0x34
#define DHCP_MESSAGE_TYPE 0x35
#define DHCP_SERVER_ID 0x36 /* by default server's IP */
#define DHCP_PARAM_REQ 0x37 /* list of options client wants */
//#define DHCP_ERR_MESSAGE 0x38 /* error message when sending NAK etc */
#define DHCP_MAX_SIZE 0x39
#define DHCP_VENDOR 0x3c /* client's vendor (a string) */
#define DHCP_CLIENT_ID 0x3d /* by default client's MAC addr, but may be arbitrarily long */
//#define DHCP_TFTP_SERVER_NAME 0x42 /* same as 'sname' field */
//#define DHCP_BOOT_FILE 0x43 /* same as 'file' field */
//#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_STATIC_ROUTES 0x79 /* RFC 3442. (mask,ip,router) tuples */
//#define DHCP_WPAD 0xfc /* MSIE's Web Proxy Autodiscovery Protocol */
#define DHCP_END 0xff
/* Offsets in option byte sequence */
#define OPT_CODE 0
#define OPT_LEN 1
#define OPT_DATA 2
/* Bits in "overload" option */
#define OPTION_FIELD 0
#define FILE_FIELD 1
#define SNAME_FIELD 2
/* DHCP_MESSAGE_TYPE values */
#define DHCPDISCOVER 1 /* client -> server */
#define DHCPOFFER 2 /* client <- server */
#define DHCPREQUEST 3 /* client -> server */
#define DHCPDECLINE 4 /* client -> server */
#define DHCPACK 5 /* client <- server */
#define DHCPNAK 6 /* client <- server */
#define DHCPRELEASE 7 /* client -> server */
#define DHCPINFORM 8 /* client -> server */
#define DHCP_MINTYPE DHCPDISCOVER
#define DHCP_MAXTYPE DHCPINFORM
struct dhcp_option {
uint8_t flags;
uint8_t code;
};
extern const struct dhcp_option dhcp_options[];
extern const char dhcp_option_strings[];
extern const uint8_t dhcp_option_lengths[];
uint8_t *get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
int end_option(uint8_t *optionptr) FAST_FUNC;
void add_option_string(uint8_t *optionptr, uint8_t *string) FAST_FUNC;
void add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) FAST_FUNC;
#if ENABLE_FEATURE_UDHCP_RFC3397
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;
#endif
POP_SAVED_FUNCTION_VISIBILITY
#endif

7
networking/udhcp/packet.c
View File

@ -17,7 +17,6 @@
#include "common.h"
#include "dhcpd.h"
#include "options.h"
void FAST_FUNC udhcp_init_header(struct dhcp_packet *packet, char type)
{
@ -34,7 +33,7 @@ void FAST_FUNC udhcp_init_header(struct dhcp_packet *packet, char type)
packet->cookie = htonl(DHCP_MAGIC);
if (DHCP_END != 0)
packet->options[0] = DHCP_END;
add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type);
udhcp_add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type);
}
#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
@ -105,7 +104,7 @@ int FAST_FUNC udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd)
udhcp_dump_packet(packet);
if (packet->op == BOOTREQUEST) {
vendor = get_option(packet, DHCP_VENDOR);
vendor = udhcp_get_option(packet, DHCP_VENDOR);
if (vendor) {
#if 0
static const char broken_vendors[][8] = {
@ -221,7 +220,7 @@ int FAST_FUNC udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
/* Currently we send full-sized DHCP packets (zero padded).
* If you need to change this: last byte of the packet is
* packet.data.options[end_option(packet.data.options)]
* packet.data.options[udhcp_end_option(packet.data.options)]
*/
udhcp_dump_packet(dhcp_pkt);
result = sendto(fd, &packet, IP_UPD_DHCP_SIZE, 0,

283
networking/udhcp/script.c
View File

@ -1,283 +0,0 @@
/* vi: set sw=4 ts=4: */
/* script.c
*
* Functions to call the DHCP client notification scripts
*
* Russ Dill <Russ.Dill@asu.edu> July 2001
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "common.h"
#include "dhcpc.h"
#include "options.h"
/* 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,
#if ENABLE_FEATURE_UDHCP_RFC3397
[OPTION_STR1035] = 1,
#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 "),
};
/* note: ip is a pointer to an IP in network order, possibly misaliged */
static int sprint_nip(char *dest, const char *pre, const uint8_t *ip)
{
return sprintf(dest, "%s%u.%u.%u.%u", pre, ip[0], ip[1], ip[2], ip[3]);
}
/* really simple implementation, just count the bits */
static int mton(uint32_t mask)
{
int i = 0;
mask = ntohl(mask); /* 111110000-like bit pattern */
while (mask) {
i++;
mask <<= 1;
}
return i;
}
/* Create "opt_name=opt_value" string */
static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_option *type_p, const char *opt_name)
{
unsigned upper_length;
int len, type, optlen;
uint16_t val_u16;
int16_t val_s16;
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);
dest = ret = xmalloc(upper_length + strlen(opt_name) + 2);
dest += sprintf(ret, "%s=", opt_name);
while (len >= optlen) {
switch (type) {
case OPTION_IP_PAIR:
dest += sprint_nip(dest, "", option);
*dest++ = '/';
option += 4;
optlen = 4;
case OPTION_IP:
dest += sprint_nip(dest, "", option);
// TODO: it can be a list only if (type_p->flags & OPTION_LIST).
// Should we bail out/warn if we see multi-ip option which is
// not allowed to be such? For example, DHCP_BROADCAST...
break;
case OPTION_BOOLEAN:
dest += sprintf(dest, *option ? "yes" : "no");
break;
case OPTION_U8:
dest += sprintf(dest, "%u", *option);
break;
case OPTION_U16:
move_from_unaligned16(val_u16, option);
dest += sprintf(dest, "%u", ntohs(val_u16));
break;
case OPTION_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));
break;
case OPTION_STRING:
memcpy(dest, option, len);
dest[len] = '\0';
return ret; /* Short circuit this case */
case OPTION_STATIC_ROUTES: {
/* Option binary format:
* mask [one byte, 0..32]
* ip [big endian, 0..4 bytes depending on mask]
* router [big endian, 4 bytes]
* may be repeated
*
* We convert it to a string "IP/MASK ROUTER IP2/MASK2 ROUTER2"
*/
const char *pfx = "";
while (len >= 1 + 4) { /* mask + 0-byte ip + router */
uint32_t nip;
uint8_t *p;
unsigned mask;
int bytes;
mask = *option++;
if (mask > 32)
break;
len--;
nip = 0;
p = (void*) &nip;
bytes = (mask + 7) / 8; /* 0 -> 0, 1..8 -> 1, 9..16 -> 2 etc */
while (--bytes >= 0) {
*p++ = *option++;
len--;
}
if (len < 4)
break;
/* print ip/mask */
dest += sprint_nip(dest, pfx, (void*) &nip);
pfx = " ";
dest += sprintf(dest, "/%u ", mask);
/* print router */
dest += sprint_nip(dest, "", option);
option += 4;
len -= 4;
}
return ret;
}
#if ENABLE_FEATURE_UDHCP_RFC3397
case OPTION_STR1035:
/* unpack option into dest; use ret for prefix (i.e., "optname=") */
dest = dname_dec(option, len, ret);
if (dest) {
free(ret);
return dest;
}
/* error. return "optname=" string */
return ret;
#endif
}
option += optlen;
len -= optlen;
if (len <= 0)
break;
*dest++ = ' ';
*dest = '\0';
}
return ret;
}
/* put all the parameters into the environment */
static char **fill_envp(struct dhcp_packet *packet)
{
int num_options = 0;
int i;
char **envp, **curr;
const char *opt_name;
uint8_t *temp;
uint8_t over = 0;
if (packet) {
for (i = 0; dhcp_options[i].code; i++) {
if (get_option(packet, dhcp_options[i].code)) {
num_options++;
if (dhcp_options[i].code == DHCP_SUBNET)
num_options++; /* for mton */
}
}
if (packet->siaddr_nip)
num_options++;
temp = get_option(packet, DHCP_OPTION_OVERLOAD);
if (temp)
over = *temp;
if (!(over & FILE_FIELD) && packet->file[0])
num_options++;
if (!(over & SNAME_FIELD) && packet->sname[0])
num_options++;
}
curr = envp = xzalloc(sizeof(char *) * (num_options + 3));
*curr = xasprintf("interface=%s", client_config.interface);
putenv(*curr++);
if (packet == NULL)
return envp;
*curr = xmalloc(sizeof("ip=255.255.255.255"));
sprint_nip(*curr, "ip=", (uint8_t *) &packet->yiaddr);
putenv(*curr++);
opt_name = dhcp_option_strings;
i = 0;
while (*opt_name) {
temp = get_option(packet, dhcp_options[i].code);
if (!temp)
goto next;
*curr = xmalloc_optname_optval(temp, &dhcp_options[i], opt_name);
putenv(*curr++);
/* Fill in a subnet bits option for things like /24 */
if (dhcp_options[i].code == DHCP_SUBNET) {
uint32_t subnet;
move_from_unaligned32(subnet, temp);
*curr = xasprintf("mask=%d", mton(subnet));
putenv(*curr++);
}
next:
opt_name += strlen(opt_name) + 1;
i++;
}
if (packet->siaddr_nip) {
*curr = xmalloc(sizeof("siaddr=255.255.255.255"));
sprint_nip(*curr, "siaddr=", (uint8_t *) &packet->siaddr_nip);
putenv(*curr++);
}
if (!(over & FILE_FIELD) && packet->file[0]) {
/* watch out for invalid packets */
*curr = xasprintf("boot_file=%."DHCP_PKT_FILE_LEN_STR"s", packet->file);
putenv(*curr++);
}
if (!(over & SNAME_FIELD) && packet->sname[0]) {
/* watch out for invalid packets */
*curr = xasprintf("sname=%."DHCP_PKT_SNAME_LEN_STR"s", packet->sname);
putenv(*curr++);
}
return envp;
}
/* Call a script with a par file and env vars */
void FAST_FUNC udhcp_run_script(struct dhcp_packet *packet, const char *name)
{
char **envp, **curr;
char *argv[3];
if (client_config.script == NULL)
return;
envp = fill_envp(packet);
/* call script */
log1("Executing %s %s", client_config.script, name);
argv[0] = (char*) client_config.script;
argv[1] = (char*) name;
argv[2] = NULL;
spawn_and_wait(argv);
for (curr = envp; *curr; curr++) {
log2(" %s", *curr);
bb_unsetenv(*curr);
free(*curr);
}
free(envp);
}