/* vi: set sw=4 ts=4: */
/*
- * udhcp DHCP client
+ * udhcp client
*
* Russ Dill <Russ.Dill@asu.edu> July 2001
*
#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)
#endif
#include <linux/filter.h>
+/* struct client_config_t client_config is in bb_common_bufsiz1 */
-static int sockfd = -1;
-#define LISTEN_NONE 0
-#define LISTEN_KERNEL 1
-#define LISTEN_RAW 2
-static smallint listen_mode;
+/*** Script execution code ***/
-/* 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;
+/* 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_DNS_STRING ] = 1, /* unused */
+ /* Hmmm, this severely overestimates size if SIP_SERVERS option
+ * is in domain name form: N-byte option in binary form
+ * mallocs ~16*N bytes. But it is freed almost at once.
+ */
+ [OPTION_SIP_SERVERS ] = sizeof("255.255.255.255 "),
+#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]);
+}
-/* struct client_config_t client_config is in bb_common_bufsiz1 */
+/* 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_optflag *optflag, const char *opt_name)
+{
+ unsigned upper_length;
+ int len, type, optlen;
+ char *dest, *ret;
+
+ /* option points to OPT_DATA, need to go back and get OPT_LEN */
+ len = option[OPT_LEN - OPT_DATA];
+
+ type = optflag->flags & OPTION_TYPE_MASK;
+ optlen = dhcp_option_lengths[type];
+ upper_length = len_of_option_as_string[type] * ((unsigned)len / (unsigned)optlen);
+
+ dest = ret = xmalloc(upper_length + strlen(opt_name) + 2);
+ dest += sprintf(ret, "%s=", opt_name);
+
+ while (len >= optlen) {
+ unsigned ip_ofs = 0;
+
+ switch (type) {
+ case OPTION_IP_PAIR:
+ dest += sprint_nip(dest, "", option);
+ *dest++ = '/';
+ ip_ofs = 4;
+ /* fall through */
+ case OPTION_IP:
+ dest += sprint_nip(dest, "", option + ip_ofs);
+ break;
+// case OPTION_BOOLEAN:
+// dest += sprintf(dest, *option ? "yes" : "no");
+// break;
+ case OPTION_U8:
+ dest += sprintf(dest, "%u", *option);
+ break;
+// case OPTION_S16:
+ case OPTION_U16: {
+ uint16_t val_u16;
+ move_from_unaligned16(val_u16, option);
+ dest += sprintf(dest, "%u", ntohs(val_u16));
+ break;
+ }
+ case OPTION_S32:
+ case OPTION_U32: {
+ uint32_t val_u32;
+ move_from_unaligned32(val_u32, option);
+ dest += sprintf(dest, type == OPTION_U32 ? "%lu" : "%ld", (unsigned long) ntohl(val_u32));
+ 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_DNS_STRING:
+ /* 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;
+ case OPTION_SIP_SERVERS:
+ /* Option binary format:
+ * type: byte
+ * type=0: domain names, dns-compressed
+ * type=1: IP addrs
+ */
+ option++;
+ len--;
+ if (option[-1] == 0) {
+ dest = dname_dec(option, len, ret);
+ if (dest) {
+ free(ret);
+ return dest;
+ }
+ } else
+ if (option[-1] == 1) {
+ const char *pfx = "";
+ while (1) {
+ len -= 4;
+ if (len < 0)
+ break;
+ dest += sprint_nip(dest, pfx, option);
+ pfx = " ";
+ option += 4;
+ }
+ }
+ return ret;
+#endif
+ } /* switch */
+ option += optlen;
+ len -= optlen;
+// TODO: it can be a list only if (optflag->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)? -
+ if (len <= 0 /* || !(optflag->flags & OPTION_LIST) */)
+ break;
+ *dest++ = ' ';
+ *dest = '\0';
+ }
+ return ret;
+}
+/* put all the parameters into the environment */
+static char **fill_envp(struct dhcp_packet *packet)
+{
+ int envc;
+ int i;
+ char **envp, **curr;
+ const char *opt_name;
+ uint8_t *temp;
+ uint8_t overload = 0;
+
+ /* We need 6 elements for:
+ * "interface=IFACE"
+ * "ip=N.N.N.N" from packet->yiaddr
+ * "siaddr=IP" from packet->siaddr_nip (unless 0)
+ * "boot_file=FILE" from packet->file (unless overloaded)
+ * "sname=SERVER_HOSTNAME" from packet->sname (unless overloaded)
+ * terminating NULL
+ */
+ envc = 6;
+ /* +1 element for each option, +2 for subnet option: */
+ if (packet) {
+ for (i = 0; dhcp_optflags[i].code; i++) {
+ if (udhcp_get_option(packet, dhcp_optflags[i].code)) {
+ if (dhcp_optflags[i].code == DHCP_SUBNET)
+ envc++; /* for mton */
+ envc++;
+ }
+ }
+ temp = udhcp_get_option(packet, DHCP_OPTION_OVERLOAD);
+ if (temp)
+ overload = *temp;
+ }
+ curr = envp = xzalloc(sizeof(char *) * envc);
+
+ *curr = xasprintf("interface=%s", client_config.interface);
+ putenv(*curr++);
+
+ if (!packet)
+ 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_optflags[i].code);
+ if (!temp)
+ goto next;
+ *curr = xmalloc_optname_optval(temp, &dhcp_optflags[i], opt_name);
+ putenv(*curr++);
+ if (dhcp_optflags[i].code == DHCP_SUBNET) {
+ /* Subnet option: make things like "$ip/$mask" possible */
+ 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 (!(overload & 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 (!(overload & 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;
+}
-/* Create a random xid */
-static uint32_t random_xid(void)
+/* Call a script with a par file and env vars */
+static void udhcp_run_script(struct dhcp_packet *packet, const char *name)
{
- static smallint initialized;
+ char **envp, **curr;
+ char *argv[3];
- if (!initialized) {
- srand(monotonic_us());
- initialized = 1;
+ 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_and_free(*curr);
}
+ free(envp);
+}
+
+
+/*** Sending/receiving packets ***/
+
+static ALWAYS_INLINE uint32_t random_xid(void)
+{
return rand();
}
/* Initialize the packet with the proper defaults */
static void init_packet(struct dhcp_packet *packet, char type)
{
+ /* Fill in: op, htype, hlen, cookie fields; message type option: */
udhcp_init_header(packet, type);
+
+ packet->xid = random_xid();
+
memcpy(packet->chaddr, client_config.client_mac, 6);
if (client_config.clientid)
- add_option_string(packet->options, client_config.clientid);
- if (client_config.hostname)
- add_option_string(packet->options, client_config.hostname);
- if (client_config.fqdn)
- 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_binary_option(packet, client_config.clientid);
}
-/* Add a parameter request list for stubborn DHCP servers. Pull the data
- * from the struct in options.c. Don't do bounds checking here because it
- * goes towards the head of the packet. */
-static void add_param_req_option(struct dhcp_packet *packet)
+static void add_client_options(struct dhcp_packet *packet)
{
uint8_t c;
- int end = end_option(packet->options);
- int i, len = 0;
+ int i, end, len;
- for (i = 0; (c = dhcp_options[i].code) != 0; i++) {
- if (( (dhcp_options[i].flags & OPTION_REQ)
+ udhcp_add_simple_option(packet, DHCP_MAX_SIZE, htons(IP_UDP_DHCP_SIZE));
+ if (client_config.hostname)
+ udhcp_add_binary_option(packet, client_config.hostname);
+ if (client_config.fqdn)
+ udhcp_add_binary_option(packet, client_config.fqdn);
+ if (client_config.vendorclass)
+ udhcp_add_binary_option(packet, client_config.vendorclass);
+
+ /* Add a "param req" option with the list of options we'd like to have
+ * from stubborn DHCP servers. Pull the data from the struct in common.c.
+ * No bounds checking because it goes towards the head of the packet. */
+ end = udhcp_end_option(packet->options);
+ len = 0;
+ for (i = 0; (c = dhcp_optflags[i].code) != 0; i++) {
+ if (( (dhcp_optflags[i].flags & OPTION_REQ)
&& !client_config.no_default_options
)
|| (client_config.opt_mask[c >> 3] & (1 << (c & 7)))
packet->options[end + OPT_LEN] = len;
packet->options[end + OPT_DATA + len] = DHCP_END;
}
+
+ /* Add -x options if any */
+ {
+ struct option_set *curr = client_config.options;
+ while (curr) {
+ udhcp_add_binary_option(packet, curr->data);
+ curr = curr->next;
+ }
+// if (client_config.sname)
+// strncpy((char*)packet->sname, client_config.sname, sizeof(packet->sname) - 1);
+// if (client_config.boot_file)
+// strncpy((char*)packet->file, client_config.boot_file, sizeof(packet->file) - 1);
+ }
}
/* RFC 2131
{
struct dhcp_packet packet;
+ /* Fill in: op, htype, hlen, cookie, chaddr fields,
+ * random xid field (we override it below),
+ * client-id option (unless -C), message type option:
+ */
init_packet(&packet, DHCPDISCOVER);
+
packet.xid = xid;
if (requested)
- 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));
- add_param_req_option(&packet);
+ udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested);
+
+ /* Add options: maxsize,
+ * optionally: hostname, fqdn, vendorclass,
+ * "param req" option according to -O, options specified with -x
+ */
+ add_client_options(&packet);
bb_info_msg("Sending discover...");
return raw_bcast_from_client_config_ifindex(&packet);
struct dhcp_packet packet;
struct in_addr addr;
+/*
+ * RFC 2131 4.3.2 DHCPREQUEST message
+ * ...
+ * If the DHCPREQUEST message contains a 'server identifier'
+ * option, the message is in response to a DHCPOFFER message.
+ * Otherwise, the message is a request to verify or extend an
+ * existing lease. If the client uses a 'client identifier'
+ * in a DHCPREQUEST message, it MUST use that same 'client identifier'
+ * in all subsequent messages. If the client included a list
+ * of requested parameters in a DHCPDISCOVER message, it MUST
+ * include that list in all subsequent messages.
+ */
+ /* Fill in: op, htype, hlen, cookie, chaddr fields,
+ * random xid field (we override it below),
+ * client-id option (unless -C), message type option:
+ */
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);
- add_param_req_option(&packet);
+ udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested);
+
+ udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server);
+
+ /* Add options: maxsize,
+ * optionally: hostname, fqdn, vendorclass,
+ * "param req" option according to -O, and options specified with -x
+ */
+ add_client_options(&packet);
addr.s_addr = requested;
bb_info_msg("Sending select for %s...", inet_ntoa(addr));
{
struct dhcp_packet packet;
+/*
+ * RFC 2131 4.3.2 DHCPREQUEST message
+ * ...
+ * DHCPREQUEST generated during RENEWING state:
+ *
+ * 'server identifier' MUST NOT be filled in, 'requested IP address'
+ * option MUST NOT be filled in, 'ciaddr' MUST be filled in with
+ * client's IP address. In this situation, the client is completely
+ * configured, and is trying to extend its lease. This message will
+ * be unicast, so no relay agents will be involved in its
+ * transmission. Because 'giaddr' is therefore not filled in, the
+ * DHCP server will trust the value in 'ciaddr', and use it when
+ * replying to the client.
+ */
+ /* Fill in: op, htype, hlen, cookie, chaddr fields,
+ * random xid field (we override it below),
+ * client-id option (unless -C), message type option:
+ */
init_packet(&packet, DHCPREQUEST);
+
packet.xid = xid;
packet.ciaddr = ciaddr;
- add_param_req_option(&packet);
+
+ /* Add options: maxsize,
+ * optionally: hostname, fqdn, vendorclass,
+ * "param req" option according to -O, and options specified with -x
+ */
+ add_client_options(&packet);
bb_info_msg("Sending renew...");
if (server)
{
struct dhcp_packet packet;
+ /* Fill in: op, htype, hlen, cookie, chaddr, random xid fields,
+ * client-id option (unless -C), message type option:
+ */
init_packet(&packet, DHCPDECLINE);
+
+ /* RFC 2131 says DHCPDECLINE's xid is randomly selected by client,
+ * but in case the server is buggy and wants DHCPDECLINE's xid
+ * to match the xid which started entire handshake,
+ * we use the same xid we used in initial DHCPDISCOVER:
+ */
packet.xid = xid;
- add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
- add_simple_option(packet.options, DHCP_SERVER_ID, server);
+ /* DHCPDECLINE uses "requested ip", not ciaddr, to store offered IP */
+ udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested);
+
+ udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server);
bb_info_msg("Sending decline...");
return raw_bcast_from_client_config_ifindex(&packet);
{
struct dhcp_packet packet;
+ /* Fill in: op, htype, hlen, cookie, chaddr, random xid fields,
+ * client-id option (unless -C), message type option:
+ */
init_packet(&packet, DHCPRELEASE);
- packet.xid = random_xid();
+
+ /* DHCPRELEASE uses ciaddr, not "requested ip", to store IP being released */
packet.ciaddr = ciaddr;
- add_simple_option(packet.options, DHCP_SERVER_ID, server);
+ udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server);
bb_info_msg("Sending release...");
return udhcp_send_kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);
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;
return fd;
}
-/* just a little helper */
static void change_listen_mode(int new_mode)
{
log1("Entering listen mode: %s",
/* else LISTEN_NONE: sockfd stays closed */
}
-/* perform a renew */
static void perform_renew(void)
{
bb_info_msg("Performing a DHCP renew");
}
}
-/* perform a release */
static void perform_release(uint32_t requested_ip, uint32_t server_addr)
{
char buffer[sizeof("255.255.255.255")];
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;
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
+
+//usage:#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
+//usage:# define IF_UDHCP_VERBOSE(...) __VA_ARGS__
+//usage:#else
+//usage:# define IF_UDHCP_VERBOSE(...)
+//usage:#endif
+//usage:#define udhcpc_trivial_usage
+//usage: "[-fbnq"IF_UDHCP_VERBOSE("v")"oCR] [-i IFACE] [-r IP] [-s PROG] [-p PIDFILE]\n"
+//usage: " [-H HOSTNAME] [-V VENDOR] [-x OPT:VAL]... [-O OPT]..." IF_FEATURE_UDHCP_PORT(" [-P N]")
+//usage:#define udhcpc_full_usage "\n"
+//usage: IF_LONG_OPTS(
+//usage: "\n -i,--interface IFACE Interface to use (default eth0)"
+//usage: "\n -p,--pidfile FILE Create pidfile"
+//usage: "\n -s,--script PROG Run PROG at DHCP events (default "CONFIG_UDHCPC_DEFAULT_SCRIPT")"
+//usage: "\n -t,--retries N Send up to N discover packets"
+//usage: "\n -T,--timeout N Pause between packets (default 3 seconds)"
+//usage: "\n -A,--tryagain N Wait N seconds after failure (default 20)"
+//usage: "\n -f,--foreground Run in foreground"
+//usage: USE_FOR_MMU(
+//usage: "\n -b,--background Background if lease is not obtained"
+//usage: )
+//usage: "\n -n,--now Exit if lease is not obtained"
+//usage: "\n -q,--quit Exit after obtaining lease"
+//usage: "\n -R,--release Release IP on exit"
+//usage: "\n -S,--syslog Log to syslog too"
+//usage: IF_FEATURE_UDHCP_PORT(
+//usage: "\n -P,--client-port N Use port N (default 68)"
+//usage: )
+//usage: IF_FEATURE_UDHCPC_ARPING(
+//usage: "\n -a,--arping Use arping to validate offered address"
+//usage: )
+//usage: "\n -O,--request-option OPT Request option OPT from server (cumulative)"
+//usage: "\n -o,--no-default-options Don't request any options (unless -O is given)"
+//usage: "\n -r,--request IP Request this IP address"
+//usage: "\n -x OPT:VAL Include option OPT in sent packets (cumulative)"
+//usage: "\n Examples of string, numeric, and hex byte opts:"
+//usage: "\n -x hostname:bbox - option 12"
+//usage: "\n -x lease:3600 - option 51 (lease time)"
+//usage: "\n -x 0x3d:0100BEEFC0FFEE - option 61 (client id)"
+//usage: "\n -F,--fqdn NAME Ask server to update DNS mapping for NAME"
+//usage: "\n -H,-h,--hostname NAME Send NAME as client hostname (default none)"
+//usage: "\n -V,--vendorclass VENDOR Vendor identifier (default 'udhcp VERSION')"
+//usage: "\n -C,--clientid-none Don't send MAC as client identifier"
+//usage: IF_UDHCP_VERBOSE(
+//usage: "\n -v Verbose"
+//usage: )
+//usage: )
+//usage: IF_NOT_LONG_OPTS(
+//usage: "\n -i IFACE Interface to use (default eth0)"
+//usage: "\n -p FILE Create pidfile"
+//usage: "\n -s PROG Run PROG at DHCP events (default "CONFIG_UDHCPC_DEFAULT_SCRIPT")"
+//usage: "\n -t N Send up to N discover packets"
+//usage: "\n -T N Pause between packets (default 3 seconds)"
+//usage: "\n -A N Wait N seconds (default 20) after failure"
+//usage: "\n -f Run in foreground"
+//usage: USE_FOR_MMU(
+//usage: "\n -b Background if lease is not obtained"
+//usage: )
+//usage: "\n -n Exit if lease is not obtained"
+//usage: "\n -q Exit after obtaining lease"
+//usage: "\n -R Release IP on exit"
+//usage: "\n -S Log to syslog too"
+//usage: IF_FEATURE_UDHCP_PORT(
+//usage: "\n -P N Use port N (default 68)"
+//usage: )
+//usage: IF_FEATURE_UDHCPC_ARPING(
+//usage: "\n -a Use arping to validate offered address"
+//usage: )
+//usage: "\n -O OPT Request option OPT from server (cumulative)"
+//usage: "\n -o Don't request any options (unless -O is given)"
+//usage: "\n -r IP Request this IP address"
+//usage: "\n -x OPT:VAL Include option OPT in sent packets (cumulative)"
+//usage: "\n Examples of string, numeric, and hex byte opts:"
+//usage: "\n -x hostname:bbox - option 12"
+//usage: "\n -x lease:3600 - option 51 (lease time)"
+//usage: "\n -x 0x3d:0100BEEFC0FFEE - option 61 (client id)"
+//usage: "\n -F NAME Ask server to update DNS mapping for NAME"
+//usage: "\n -H,-h NAME Send NAME as client hostname (default none)"
+//usage: "\n -V VENDOR Vendor identifier (default 'udhcp VERSION')"
+//usage: "\n -C Don't send MAC as client identifier"
+//usage: IF_UDHCP_VERBOSE(
+//usage: "\n -v Verbose"
+//usage: )
+//usage: )
+
int udhcpc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int udhcpc_main(int argc UNUSED_PARAM, char **argv)
{
uint8_t *temp, *message;
- const char *str_c, *str_V, *str_h, *str_F, *str_r;
+ const char *str_V, *str_h, *str_F, *str_r;
IF_FEATURE_UDHCP_PORT(char *str_P;)
llist_t *list_O = NULL;
+ llist_t *list_x = NULL;
int tryagain_timeout = 20;
int discover_timeout = 3;
int discover_retries = 3;
#if ENABLE_LONG_OPTS
static const char udhcpc_longopts[] ALIGN1 =
- "clientid\0" Required_argument "c"
"clientid-none\0" No_argument "C"
"vendorclass\0" Required_argument "V"
"hostname\0" Required_argument "H"
;
#endif
enum {
- OPT_c = 1 << 0,
- OPT_C = 1 << 1,
- OPT_V = 1 << 2,
- OPT_H = 1 << 3,
- OPT_h = 1 << 4,
- OPT_F = 1 << 5,
- OPT_i = 1 << 6,
- OPT_n = 1 << 7,
- OPT_p = 1 << 8,
- OPT_q = 1 << 9,
- OPT_R = 1 << 10,
- OPT_r = 1 << 11,
- OPT_s = 1 << 12,
- OPT_T = 1 << 13,
- OPT_t = 1 << 14,
- OPT_S = 1 << 15,
- OPT_A = 1 << 16,
- OPT_O = 1 << 17,
- OPT_o = 1 << 18,
+ OPT_C = 1 << 0,
+ OPT_V = 1 << 1,
+ OPT_H = 1 << 2,
+ OPT_h = 1 << 3,
+ OPT_F = 1 << 4,
+ OPT_i = 1 << 5,
+ OPT_n = 1 << 6,
+ OPT_p = 1 << 7,
+ OPT_q = 1 << 8,
+ OPT_R = 1 << 9,
+ OPT_r = 1 << 10,
+ OPT_s = 1 << 11,
+ OPT_T = 1 << 12,
+ OPT_t = 1 << 13,
+ OPT_S = 1 << 14,
+ OPT_A = 1 << 15,
+ OPT_O = 1 << 16,
+ OPT_o = 1 << 17,
+ OPT_x = 1 << 18,
OPT_f = 1 << 19,
/* The rest has variable bit positions, need to be clever */
OPTBIT_f = 19,
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 */
- /* Cc: mutually exclusive; O: list; -T,-t,-A take numeric param */
- opt_complementary = "c--C:C--c:O::T+:t+:A+"
+ /* O,x: list; -T,-t,-A take numeric param */
+ opt_complementary = "O::x::T+:t+:A+"
#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
":vv"
#endif
;
IF_LONG_OPTS(applet_long_options = udhcpc_longopts;)
- opt = getopt32(argv, "c:CV:H:h:F:i:np:qRr:s:T:t:SA:O:of"
+ opt = getopt32(argv, "CV:H:h:F:i:np:qRr:s:T:t:SA:O:ox:f"
USE_FOR_MMU("b")
IF_FEATURE_UDHCPC_ARPING("a")
IF_FEATURE_UDHCP_PORT("P:")
"v"
- , &str_c, &str_V, &str_h, &str_h, &str_F
+ , &str_V, &str_h, &str_h, &str_F
, &client_config.interface, &client_config.pidfile, &str_r /* i,p */
, &client_config.script /* s */
, &discover_timeout, &discover_retries, &tryagain_timeout /* T,t,A */
, &list_O
+ , &list_x
IF_FEATURE_UDHCP_PORT(, &str_P)
#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
, &dhcp_verbose
client_config.no_default_options = 1;
while (list_O) {
char *optstr = llist_pop(&list_O);
- int n = index_in_strings(dhcp_option_strings, optstr);
- if (n < 0)
- bb_error_msg_and_die("unknown option '%s'", optstr);
- n = dhcp_options[n].code;
+ unsigned n = udhcp_option_idx(optstr);
+ n = dhcp_optflags[n].code;
client_config.opt_mask[n >> 3] |= 1 << (n & 7);
}
+ while (list_x) {
+ char *optstr = llist_pop(&list_x);
+ char *colon = strchr(optstr, ':');
+ if (colon)
+ *colon = ' ';
+ /* now it looks similar to udhcpd's config file line:
+ * "optname optval", using the common routine: */
+ udhcp_str2optset(optstr, &client_config.options);
+ }
if (udhcp_read_interface(client_config.interface,
&client_config.ifindex,
return 1;
}
- if (opt & OPT_c) {
- client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, str_c, 0);
- } else if (!(opt & OPT_C)) {
- /* not set and not suppressed, set the default client ID */
+ if (!(opt & OPT_C) && !udhcp_find_option(client_config.options, DHCP_CLIENT_ID)) {
+ /* not suppressed and not set, set the default client ID */
client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7);
client_config.clientid[OPT_DATA] = 1; /* type: ethernet */
memcpy(client_config.clientid + OPT_DATA+1, client_config.client_mac, 6);
bb_sanitize_stdio();
/* Equivalent of doing a fflush after every \n */
setlinebuf(stdout);
-
/* Create pidfile */
write_pidfile(client_config.pidfile);
-
/* Goes to stdout (unless NOMMU) and possibly syslog */
bb_info_msg("%s (v"BB_VER") started", applet_name);
-
/* Set up the signal pipe */
udhcp_sp_setup();
+ /* We want random_xid to be random... */
+ srand(monotonic_us());
state = INIT_SELECTING;
udhcp_run_script(NULL, "deconfig");
tv.tv_sec = timeout - already_waited_sec;
tv.tv_usec = 0;
- retval = 0; /* If we already timed out, fall through, else... */
+ retval = 0;
+ /* If we already timed out, fall through with retval = 0, else... */
if ((int)tv.tv_sec > 0) {
timestamp_before_wait = (unsigned)monotonic_sec();
log1("Waiting on select...");
* resend discover/renew/whatever
*/
if (retval == 0) {
+ /* When running on a bridge, the ifindex may have changed
+ * (e.g. if member interfaces were added/removed
+ * or if the status of the bridge changed).
+ * Refresh ifindex and client_mac:
+ */
+ udhcp_read_interface(client_config.interface,
+ &client_config.ifindex,
+ NULL,
+ client_config.client_mac);
+
/* We will restart the wait in any case */
already_waited_sec = 0;
/* Ignore packets that aren't for us */
if (packet.hlen != 6
- || memcmp(packet.chaddr, client_config.client_mac, 6)
+ || memcmp(packet.chaddr, client_config.client_mac, 6) != 0
) {
//FIXME: need to also check that last 10 bytes are zero
log1("chaddr does not match, ignoring packet"); // log2?
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;
/* 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;
}
/* it IS unaligned sometimes, don't "optimize" */
move_from_unaligned32(server_addr, temp);
- xid = packet.xid;
+ /*xid = packet.xid; - already is */
requested_ip = packet.yiaddr;
/* enter requesting state */
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;
projects / oweals / busybox.git / blobdiff