udhcp: merge options.h into common.h, script.c into dhcpc.c
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/udhcp/Kbuild b/networking/udhcp/Kbuild
index 693f6c8..c09f9aa 100644
--- a/networking/udhcp/Kbuild
+++ b/networking/udhcp/Kbuild
@@ -10,7 +10,7 @@
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
diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index d740ca5..2ce6759 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -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 @@
[(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 @@
// 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 @@
# 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
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index e79feb7..7587509 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -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 @@
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 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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
return fd;
}
-/* just a little helper */
static void change_listen_mode(int new_mode)
{
log1("Entering listen mode: %s",
@@ -389,7 +657,6 @@
/* 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 @@
}
}
-/* 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 @@
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 @@
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 @@
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 @@
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 @@
/* 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 @@
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;
diff --git a/networking/udhcp/dhcpd.c b/networking/udhcp/dhcpd.c
index d6e90cd..93e06b2 100644
--- a/networking/udhcp/dhcpd.c
+++ b/networking/udhcp/dhcpd.c
@@ -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 @@
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 @@
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 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 @@
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 @@
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 @@
}
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 @@
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 @@
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 @@
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 @@
}
/* 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 @@
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);
}
diff --git a/networking/udhcp/dhcprelay.c b/networking/udhcp/dhcprelay.c
index a7e715f..9f6ac69 100644
--- a/networking/udhcp/dhcprelay.c
+++ b/networking/udhcp/dhcprelay.c
@@ -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 @@
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;
diff --git a/networking/udhcp/domain_codec.c b/networking/udhcp/domain_codec.c
index 45354e7..c00b4ed 100644
--- a/networking/udhcp/domain_codec.c
+++ b/networking/udhcp/domain_codec.c
@@ -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 */
diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c
index 62f4a38..a23e886 100644
--- a/networking/udhcp/files.c
+++ b/networking/udhcp/files.c
@@ -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)
diff --git a/networking/udhcp/options.c b/networking/udhcp/options.c
index 29a2640..b4d2d2d 100644
--- a/networking/udhcp/options.c
+++ b/networking/udhcp/options.c
@@ -7,8 +7,6 @@
*/
#include "common.h"
-#include "dhcpd.h"
-#include "options.h"
/* Supported options are easily added here.
@@ -111,7 +109,6 @@
"wpad" "\0" /* DHCP_WPAD */
;
-
/* Lengths of the different option types */
const uint8_t dhcp_option_lengths[] ALIGN1 = {
[OPTION_IP] = 4,
@@ -144,9 +141,8 @@
# 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 @@
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 @@
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 @@
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 @@
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 @@
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;
}
}
diff --git a/networking/udhcp/options.h b/networking/udhcp/options.h
deleted file mode 100644
index 3ca4dc4..0000000
--- a/networking/udhcp/options.h
+++ /dev/null
@@ -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
diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c
index 84d8309..03d5e1f 100644
--- a/networking/udhcp/packet.c
+++ b/networking/udhcp/packet.c
@@ -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 @@
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 @@
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 @@
/* 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,
diff --git a/networking/udhcp/script.c b/networking/udhcp/script.c
deleted file mode 100644
index 400fd2b..0000000
--- a/networking/udhcp/script.c
+++ /dev/null
@@ -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);
-}