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-rw-r--r--networking/udhcpc.c1587
1 files changed, 0 insertions, 1587 deletions
diff --git a/networking/udhcpc.c b/networking/udhcpc.c
deleted file mode 100644
index c05ca4557..000000000
--- a/networking/udhcpc.c
+++ /dev/null
@@ -1,1587 +0,0 @@
-/* dhcpd.c
- *
- * udhcp DHCP client
- *
- * Russ Dill <Russ.Dill@asu.edu> July 2001
- *
- * Converted to busybox by Glenn McGrath August 2002
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <stdio.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/file.h>
-#include <unistd.h>
-#include <getopt.h>
-#include <stdlib.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <signal.h>
-#include <time.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <net/if.h>
-#include <errno.h>
-#include <netinet/ip.h>
-#include <netinet/udp.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-
-#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
-#include <netpacket/packet.h>
-#include <net/ethernet.h>
-#else
-#include <asm/types.h>
-#include <linux/if_packet.h>
-#include <linux/if_ether.h>
-#endif
-#include "libbb.h"
-
-static int state;
-static unsigned long requested_ip; /* = 0 */
-static unsigned long server_addr;
-static unsigned long timeout;
-static int packet_num; /* = 0 */
-static int fd_main;
-
-/* #define DEBUG */
-
-#define VERSION "0.9.7"
-
-#define LISTEN_NONE 0
-#define LISTEN_KERNEL 1
-#define LISTEN_RAW 2
-static int listen_mode;
-
-#define DEFAULT_SCRIPT "/usr/share/udhcpc/default.script"
-
-#define DHCP_END 0xFF
-#define TYPE_MASK 0x0F
-#define BROADCAST_FLAG 0x8000
-
-#define SERVER_PORT 67
-
-#define DHCP_MAGIC 0x63825363
-
-#define BOOTREQUEST 1
-#define BOOTREPLY 2
-
-#define ETH_10MB 1
-#define ETH_10MB_LEN 6
-
-#define OPTION_FIELD 0
-#define FILE_FIELD 1
-#define SNAME_FIELD 2
-
-#define INIT_SELECTING 0
-#define REQUESTING 1
-#define BOUND 2
-#define RENEWING 3
-#define REBINDING 4
-#define INIT_REBOOT 5
-#define RENEW_REQUESTED 6
-#define RELEASED 7
-
-#define CLIENT_PORT 68
-
-#define DHCPDISCOVER 1
-#define DHCPOFFER 2
-#define DHCPREQUEST 3
-#define DHCPDECLINE 4
-#define DHCPACK 5
-#define DHCPNAK 6
-#define DHCPRELEASE 7
-#define DHCPINFORM 8
-
-/* DHCP option codes (partial list) */
-#define DHCP_PADDING 0x00
-#define DHCP_SUBNET 0x01
-#define DHCP_TIME_OFFSET 0x02
-#define DHCP_ROUTER 0x03
-#define DHCP_TIME_SERVER 0x04
-#define DHCP_NAME_SERVER 0x05
-#define DHCP_DNS_SERVER 0x06
-#define DHCP_LOG_SERVER 0x07
-#define DHCP_COOKIE_SERVER 0x08
-#define DHCP_LPR_SERVER 0x09
-#define DHCP_HOST_NAME 0x0c
-#define DHCP_BOOT_SIZE 0x0d
-#define DHCP_DOMAIN_NAME 0x0f
-#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_NTP_SERVER 0x2a
-#define DHCP_WINS_SERVER 0x2c
-#define DHCP_REQUESTED_IP 0x32
-#define DHCP_LEASE_TIME 0x33
-#define DHCP_OPTION_OVER 0x34
-#define DHCP_MESSAGE_TYPE 0x35
-#define DHCP_SERVER_ID 0x36
-#define DHCP_PARAM_REQ 0x37
-#define DHCP_MESSAGE 0x38
-#define DHCP_MAX_SIZE 0x39
-#define DHCP_T1 0x3a
-#define DHCP_T2 0x3b
-#define DHCP_VENDOR 0x3c
-#define DHCP_CLIENT_ID 0x3d
-
-/* miscellaneous defines */
-#define MAC_BCAST_ADDR (unsigned char *) "\xff\xff\xff\xff\xff\xff"
-#define OPT_CODE 0
-#define OPT_LEN 1
-#define OPT_DATA 2
-
-enum {
- OPTION_IP = 1,
- OPTION_IP_PAIR,
- OPTION_STRING,
- OPTION_BOOLEAN,
- OPTION_U8,
- OPTION_U16,
- OPTION_S16,
- OPTION_U32,
- OPTION_S32
-};
-
-#define OPTION_REQ 0x10 /* have the client request this option */
-#define OPTION_LIST 0x20 /* There can be a list of 1 or more of these */
-
-#ifdef SYSLOG
-# define LOG(level, str, args...) do { printf(str, ## args); \
- printf("\n"); \
- syslog(level, str, ## args); } while(0)
-# define OPEN_LOG(name) openlog(name, 0, 0)
-# define CLOSE_LOG() closelog()
-#else
-# define LOG_EMERG "EMERGENCY!"
-# define LOG_ALERT "ALERT!"
-# define LOG_CRIT "critical!"
-# define LOG_WARNING "warning"
-# define LOG_ERR "error"
-# define LOG_INFO "info"
-# define LOG_DEBUG "debug"
-# define LOG(level, str, args...) do { printf("%s, " str "\n", level, ## args); } while(0)
-# define OPEN_LOG(name)
-# define CLOSE_LOG()
-#endif
-
-#ifdef DEBUG
-# undef DEBUG
-# define DEBUG(level, str, args...) LOG(level, str, ## args)
-# define DEBUGGING
-#else
-# define DEBUG(level, str, args...)
-#endif
-
-struct dhcpMessage {
- u_int8_t op;
- u_int8_t htype;
- u_int8_t hlen;
- u_int8_t hops;
- u_int32_t xid;
- u_int16_t secs;
- u_int16_t flags;
- u_int32_t ciaddr;
- u_int32_t yiaddr;
- u_int32_t siaddr;
- u_int32_t giaddr;
- u_int8_t chaddr[16];
- u_int8_t sname[64];
- u_int8_t file[128];
- u_int32_t cookie;
- u_int8_t options[308]; /* 312 - cookie */
-};
-
-struct client_config_t {
- char foreground; /* Do not fork */
- char quit_after_lease; /* Quit after obtaining lease */
- char abort_if_no_lease; /* Abort if no lease */
- char *interface; /* The name of the interface to use */
- char *pidfile; /* Optionally store the process ID */
- char *script; /* User script to run at dhcp events */
- unsigned char *clientid; /* Optional client id to use */
- unsigned char *hostname; /* Optional hostname to use */
- int ifindex; /* Index number of the interface to use */
- unsigned char arp[6]; /* Our arp address */
-};
-
-struct client_config_t client_config = {
- /* Default options. */
- abort_if_no_lease:0,
- foreground:0,
- quit_after_lease:0,
- interface:"eth0",
- pidfile:NULL,
- script:DEFAULT_SCRIPT,
- clientid:NULL,
- hostname:NULL,
- ifindex:0,
- arp:"\0\0\0\0\0\0", /* appease gcc-3.0 */
-};
-
-struct dhcp_option {
- char name[10];
- char flags;
- unsigned char code;
-};
-
-struct udp_dhcp_packet {
- struct iphdr ip;
- struct udphdr udp;
- struct dhcpMessage data;
-};
-
-static const struct dhcp_option options[] = {
- /* name[10] flags code */
- {"subnet", OPTION_IP | OPTION_REQ, 0x01},
- {"timezone", OPTION_S32, 0x02},
- {"router", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03},
- {"timesvr", OPTION_IP | OPTION_LIST, 0x04},
- {"namesvr", OPTION_IP | OPTION_LIST, 0x05},
- {"dns", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x06},
- {"logsvr", OPTION_IP | OPTION_LIST, 0x07},
- {"cookiesvr", OPTION_IP | OPTION_LIST, 0x08},
- {"lprsvr", OPTION_IP | OPTION_LIST, 0x09},
- {"hostname", OPTION_STRING | OPTION_REQ, 0x0c},
- {"bootsize", OPTION_U16, 0x0d},
- {"domain", OPTION_STRING | OPTION_REQ, 0x0f},
- {"swapsvr", OPTION_IP, 0x10},
- {"rootpath", OPTION_STRING, 0x11},
- {"ipttl", OPTION_U8, 0x17},
- {"mtu", OPTION_U16, 0x1a},
- {"broadcast", OPTION_IP | OPTION_REQ, 0x1c},
- {"ntpsrv", OPTION_IP | OPTION_LIST, 0x2a},
- {"wins", OPTION_IP | OPTION_LIST, 0x2c},
- {"requestip", OPTION_IP, 0x32},
- {"lease", OPTION_U32, 0x33},
- {"dhcptype", OPTION_U8, 0x35},
- {"serverid", OPTION_IP, 0x36},
- {"message", OPTION_STRING, 0x38},
- {"tftp", OPTION_STRING, 0x42},
- {"bootfile", OPTION_STRING, 0x43},
- {"", 0x00, 0x00}
-};
-
-/* Lengths of the different option types */
-static const unsigned char option_lengths[] = {
- [OPTION_IP] = 4,
- [OPTION_IP_PAIR] = 8,
- [OPTION_BOOLEAN] = 1,
- [OPTION_STRING] = 1,
- [OPTION_U8] = 1,
- [OPTION_U16] = 2,
- [OPTION_S16] = 2,
- [OPTION_U32] = 4,
- [OPTION_S32] = 4
-};
-
-/* get a rough idea of how long an option will be (rounding up...) */
-static const unsigned char max_option_length[] = {
- [OPTION_IP] = sizeof("255.255.255.255 "),
- [OPTION_IP_PAIR] = sizeof("255.255.255.255 ") * 2,
- [OPTION_STRING] = 1,
- [OPTION_BOOLEAN] = sizeof("yes "),
- [OPTION_U8] = sizeof("255 "),
- [OPTION_U16] = sizeof("65535 "),
- [OPTION_S16] = sizeof("-32768 "),
- [OPTION_U32] = sizeof("4294967295 "),
- [OPTION_S32] = sizeof("-2147483684 "),
-};
-
-/* return the position of the 'end' option (no bounds checking) */
-static int end_option(unsigned char *optionptr)
-{
- int i = 0;
-
- while (optionptr[i] != DHCP_END) {
- if (optionptr[i] == DHCP_PADDING)
- i++;
- else
- i += optionptr[i + OPT_LEN] + 2;
- }
- return i;
-}
-
-/* add an option string to the options (an option string contains an option code,
- * length, then data) */
-static int add_option_string(unsigned char *optionptr, unsigned char *string)
-{
- int end = end_option(optionptr);
-
- /* end position + string length + option code/length + end option */
- if (end + string[OPT_LEN] + 2 + 1 >= 308) {
- LOG(LOG_ERR, "Option 0x%02x did not fit into the packet!",
- string[OPT_CODE]);
- return 0;
- }
- DEBUG(LOG_INFO, "adding option 0x%02x", string[OPT_CODE]);
- memcpy(optionptr + end, string, string[OPT_LEN] + 2);
- optionptr[end + string[OPT_LEN] + 2] = DHCP_END;
- return string[OPT_LEN] + 2;
-}
-
-/* add a one to four byte option to a packet */
-static int add_simple_option(unsigned char *optionptr, unsigned char code,
- u_int32_t data)
-{
- char length = 0;
- int i;
- unsigned char option[2 + 4];
- unsigned char *u8;
- u_int16_t *u16;
- u_int32_t *u32;
- u_int32_t aligned;
-
- u8 = (unsigned char *) &aligned;
- u16 = (u_int16_t *) & aligned;
- u32 = &aligned;
-
- for (i = 0; options[i].code; i++)
- if (options[i].code == code) {
- length = option_lengths[options[i].flags & TYPE_MASK];
- }
-
- if (!length) {
- DEBUG(LOG_ERR, "Could not add option 0x%02x", code);
- return 0;
- }
-
- option[OPT_CODE] = code;
- option[OPT_LEN] = length;
-
- switch (length) {
- case 1:
- *u8 = data;
- break;
- case 2:
- *u16 = data;
- break;
- case 4:
- *u32 = data;
- break;
- }
-
- memcpy(option + 2, &aligned, length);
- return add_option_string(optionptr, option);
-}
-
-static u_int16_t checksum(void *addr, int count)
-{
- /* Compute Internet Checksum for "count" bytes
- * beginning at location "addr".
- */
- register int32_t sum = 0;
- u_int16_t *source = (u_int16_t *) addr;
-
- while (count > 1) {
- /* This is the inner loop */
- sum += *source++;
- count -= 2;
- }
-
- /* Add left-over byte, if any */
- if (count > 0) {
- sum += *(unsigned char *) source;
- }
-
- /* Fold 32-bit sum to 16 bits */
- while (sum >> 16) {
- sum = (sum & 0xffff) + (sum >> 16);
- }
-
- return ~sum;
-}
-
-/* Constuct a ip/udp header for a packet, and specify the source and dest hardware address */
-static int raw_packet(struct dhcpMessage *payload, u_int32_t source_ip,
- int source_port, u_int32_t dest_ip, int dest_port,
- unsigned char *dest_arp, int ifindex)
-{
- int l_fd;
- int result;
- struct sockaddr_ll dest;
- struct udp_dhcp_packet packet;
-
- if ((l_fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
- DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
- return -1;
- }
-
- memset(&dest, 0, sizeof(dest));
- memset(&packet, 0, sizeof(packet));
-
- dest.sll_family = AF_PACKET;
- dest.sll_protocol = htons(ETH_P_IP);
- dest.sll_ifindex = ifindex;
- dest.sll_halen = 6;
- memcpy(dest.sll_addr, dest_arp, 6);
- if (bind(l_fd, (struct sockaddr *) &dest, sizeof(struct sockaddr_ll)) < 0) {
- DEBUG(LOG_ERR, "bind call failed: %s", strerror(errno));
- close(l_fd);
- return -1;
- }
-
- packet.ip.protocol = IPPROTO_UDP;
- packet.ip.saddr = source_ip;
- packet.ip.daddr = dest_ip;
- packet.udp.source = htons(source_port);
- packet.udp.dest = htons(dest_port);
- packet.udp.len = htons(sizeof(packet.udp) + sizeof(struct dhcpMessage)); /* cheat on the psuedo-header */
- packet.ip.tot_len = packet.udp.len;
- memcpy(&(packet.data), payload, sizeof(struct dhcpMessage));
- packet.udp.check = checksum(&packet, sizeof(struct udp_dhcp_packet));
-
- packet.ip.tot_len = htons(sizeof(struct udp_dhcp_packet));
- packet.ip.ihl = sizeof(packet.ip) >> 2;
- packet.ip.version = IPVERSION;
- packet.ip.ttl = IPDEFTTL;
- packet.ip.check = checksum(&(packet.ip), sizeof(packet.ip));
-
- result =
- sendto(l_fd, &packet, sizeof(struct udp_dhcp_packet), 0,
- (struct sockaddr *) &dest, sizeof(dest));
- if (result <= 0) {
- DEBUG(LOG_ERR, "write on socket failed: %s", strerror(errno));
- }
- close(l_fd);
- return result;
-}
-
-/* Let the kernel do all the work for packet generation */
-static int kernel_packet(struct dhcpMessage *payload, u_int32_t source_ip,
- int source_port, u_int32_t dest_ip, int dest_port)
-{
- int n = 1;
- int l_fd, result;
- struct sockaddr_in client;
-
- if ((l_fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
- return -1;
- }
-
- if (setsockopt(l_fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) ==
- -1) {
- return -1;
- }
-
- memset(&client, 0, sizeof(client));
- client.sin_family = AF_INET;
- client.sin_port = htons(source_port);
- client.sin_addr.s_addr = source_ip;
-
- if (bind(l_fd, (struct sockaddr *) &client, sizeof(struct sockaddr)) ==
- -1) {
- return -1;
- }
-
- memset(&client, 0, sizeof(client));
- client.sin_family = AF_INET;
- client.sin_port = htons(dest_port);
- client.sin_addr.s_addr = dest_ip;
-
- if (connect(l_fd, (struct sockaddr *) &client, sizeof(struct sockaddr)) ==
- -1) {
- return -1;
- }
-
- result = write(l_fd, payload, sizeof(struct dhcpMessage));
- close(l_fd);
- return result;
-}
-
-/* initialize a packet with the proper defaults */
-static void init_packet(struct dhcpMessage *packet, char type)
-{
- struct vendor {
- char vendor, length;
- char str[sizeof("udhcp " VERSION)];
- }
- vendor_id = {
- DHCP_VENDOR, sizeof("udhcp " VERSION) - 1, "udhcp " VERSION};
-
- memset(packet, 0, sizeof(struct dhcpMessage));
- switch (type) {
- case DHCPDISCOVER:
- case DHCPREQUEST:
- case DHCPRELEASE:
- case DHCPINFORM:
- packet->op = BOOTREQUEST;
- break;
- case DHCPOFFER:
- case DHCPACK:
- case DHCPNAK:
- packet->op = BOOTREPLY;
- }
- packet->htype = ETH_10MB;
- packet->hlen = ETH_10MB_LEN;
- packet->cookie = htonl(DHCP_MAGIC);
- packet->options[0] = DHCP_END;
- add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type);
-
- memcpy(packet->chaddr, client_config.arp, 6);
- add_option_string(packet->options, client_config.clientid);
- if (client_config.hostname) {
- add_option_string(packet->options, client_config.hostname);
- }
- add_option_string(packet->options, (unsigned char *) &vendor_id);
-}
-
-
-/* Add a paramater 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_requests(struct dhcpMessage *packet)
-{
- int end = end_option(packet->options);
- int i, len = 0;
-
- packet->options[end + OPT_CODE] = DHCP_PARAM_REQ;
- for (i = 0; options[i].code; i++) {
- if (options[i].flags & OPTION_REQ) {
- packet->options[end + OPT_DATA + len++] = options[i].code;
- }
- }
- packet->options[end + OPT_LEN] = len;
- packet->options[end + OPT_DATA + len] = DHCP_END;
-
-}
-
-/* Broadcast a DHCP discover packet to the network, with an optionally requested IP */
-static inline int send_discover(unsigned long xid, unsigned long requested)
-{
- struct dhcpMessage packet;
-
- init_packet(&packet, DHCPDISCOVER);
- packet.xid = xid;
- if (requested) {
- add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
- }
- add_requests(&packet);
- DEBUG(LOG_DEBUG, "Sending discover...");
- return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
- SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
-}
-
-/* Broadcasts a DHCP request message */
-static inline int send_selecting(unsigned long xid, unsigned long server,
- unsigned long requested)
-{
- struct dhcpMessage packet;
- struct in_addr addr;
-
- 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_requests(&packet);
- addr.s_addr = requested;
- DEBUG(LOG_DEBUG, "Sending select for %s...", inet_ntoa(addr));
- return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
- SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
-}
-
-
-/* Unicasts or broadcasts a DHCP renew message */
-static int send_renew(unsigned long xid, unsigned long server,
- unsigned long ciaddr)
-{
- struct dhcpMessage packet;
-
- init_packet(&packet, DHCPREQUEST);
- packet.xid = xid;
- packet.ciaddr = ciaddr;
-
- add_requests(&packet);
- DEBUG(LOG_DEBUG, "Sending renew...");
- if (server) {
- return kernel_packet(&packet, ciaddr, CLIENT_PORT, server,
- SERVER_PORT);
- }
- return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
- SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
-}
-
-/* Create a random xid */
-static unsigned long random_xid(void)
-{
- static int initialized;
-
- if (!initialized) {
- srand(time(0));
- initialized++;
- }
- return rand();
-}
-
-/* just a little helper */
-static void change_mode(int new_mode)
-{
- DEBUG(LOG_INFO, "entering %s listen mode",
- new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
- close(fd_main);
- fd_main = -1;
- listen_mode = new_mode;
-}
-
-
-/* SIGUSR1 handler (renew) */
-static void renew_requested(int sig)
-{
- sig = 0;
- LOG(LOG_INFO, "Received SIGUSR1");
- if (state == BOUND || state == RENEWING || state == REBINDING ||
- state == RELEASED) {
- change_mode(LISTEN_KERNEL);
- packet_num = 0;
- state = RENEW_REQUESTED;
- }
-
- if (state == RELEASED) {
- change_mode(LISTEN_RAW);
- state = INIT_SELECTING;
- }
-
- /* Kill any timeouts because the user wants this to hurry along */
- timeout = 0;
-}
-
-/* get an option with bounds checking (warning, not aligned). */
-static unsigned char *get_option(struct dhcpMessage *packet, int code)
-{
- int i, length;
- unsigned char *optionptr;
- int over = 0, done = 0, curr = OPTION_FIELD;
-
- optionptr = packet->options;
- i = 0;
- length = 308;
- while (!done) {
- if (i >= length) {
- LOG(LOG_WARNING, "bogus packet, option fields too long.");
- return NULL;
- }
- if (optionptr[i + OPT_CODE] == code) {
- if (i + 1 + optionptr[i + OPT_LEN] >= length) {
- LOG(LOG_WARNING, "bogus packet, option fields too long.");
- return NULL;
- }
- return optionptr + i + 2;
- }
- switch (optionptr[i + OPT_CODE]) {
- case DHCP_PADDING:
- i++;
- break;
- case DHCP_OPTION_OVER:
- if (i + 1 + optionptr[i + OPT_LEN] >= length) {
- LOG(LOG_WARNING, "bogus packet, option fields too long.");
- return NULL;
- }
- over = optionptr[i + 3];
- i += optionptr[OPT_LEN] + 2;
- break;
- case DHCP_END:
- if (curr == OPTION_FIELD && over & FILE_FIELD) {
- optionptr = packet->file;
- i = 0;
- length = 128;
- curr = FILE_FIELD;
- } else if (curr == FILE_FIELD && over & SNAME_FIELD) {
- optionptr = packet->sname;
- i = 0;
- length = 64;
- curr = SNAME_FIELD;
- } else {
- done = 1;
- }
- break;
- default:
- i += optionptr[OPT_LEN + i] + 2;
- }
- }
- return NULL;
-}
-
-static int sprintip(char *dest, char *pre, unsigned char *ip)
-{
- return sprintf(dest, "%s%d.%d.%d.%d ", pre, ip[0], ip[1], ip[2], ip[3]);
-}
-
-
-/* Fill dest with the text of option 'option'. */
-static inline void fill_options(char *dest, unsigned char *option,
- const struct dhcp_option *type_p)
-{
- int type, optlen;
- u_int16_t val_u16;
- int16_t val_s16;
- u_int32_t val_u32;
- int32_t val_s32;
- int len = option[OPT_LEN - 2];
-
- dest += sprintf(dest, "%s=", type_p->name);
-
- type = type_p->flags & TYPE_MASK;
- optlen = option_lengths[type];
- for (;;) {
- switch (type) {
- case OPTION_IP_PAIR:
- dest += sprintip(dest, "", option);
- *(dest++) = '/';
- option += 4;
- optlen = 4;
- case OPTION_IP: /* Works regardless of host byte order. */
- dest += sprintip(dest, "", option);
- break;
- case OPTION_BOOLEAN:
- dest += sprintf(dest, *option ? "yes " : "no ");
- break;
- case OPTION_U8:
- dest += sprintf(dest, "%u ", *option);
- break;
- case OPTION_U16:
- memcpy(&val_u16, option, 2);
- dest += sprintf(dest, "%u ", ntohs(val_u16));
- break;
- case OPTION_S16:
- memcpy(&val_s16, option, 2);
- dest += sprintf(dest, "%d ", ntohs(val_s16));
- break;
- case OPTION_U32:
- memcpy(&val_u32, option, 4);
- dest += sprintf(dest, "%lu ", (unsigned long) ntohl(val_u32));
- break;
- case OPTION_S32:
- memcpy(&val_s32, option, 4);
- dest += sprintf(dest, "%ld ", (long) ntohl(val_s32));
- break;
- case OPTION_STRING:
- memcpy(dest, option, len);
- dest[len] = '\0';
- return; /* Short circuit this case */
- }
- option += optlen;
- len -= optlen;
- if (len <= 0) {
- break;
- }
- }
-}
-
-static char *find_env(const char *prefix, char *defaultstr)
-{
- extern char **environ;
- char **ptr;
- const int len = strlen(prefix);
-
- for (ptr = environ; *ptr != NULL; ptr++) {
- if (strncmp(prefix, *ptr, len) == 0) {
- return *ptr;
- }
- }
- return defaultstr;
-}
-
-/* put all the paramaters into an environment */
-static char **fill_envp(struct dhcpMessage *packet)
-{
- /* supported options are easily added here */
- int num_options = 0;
- int i, j;
- char **envp;
- unsigned char *temp;
- char over = 0;
-
- if (packet == NULL) {
- num_options = 0;
- } else {
- for (i = 0; options[i].code; i++) {
- if (get_option(packet, options[i].code)) {
- num_options++;
- }
- }
- if (packet->siaddr) {
- num_options++;
- }
- if ((temp = get_option(packet, DHCP_OPTION_OVER))) {
- over = *temp;
- }
- if (!(over & FILE_FIELD) && packet->file[0]) {
- num_options++;
- }
- if (!(over & SNAME_FIELD) && packet->sname[0]) {
- num_options++;
- }
- }
-
- envp = xmalloc((num_options + 5) * sizeof(char *));
- envp[0] = xmalloc(sizeof("interface=") + strlen(client_config.interface));
- sprintf(envp[0], "interface=%s", client_config.interface);
- envp[1] = find_env("PATH", "PATH=/bin:/usr/bin:/sbin:/usr/sbin");
- envp[2] = find_env("HOME", "HOME=/");
-
- if (packet == NULL) {
- envp[3] = NULL;
- return envp;
- }
-
- envp[3] = xmalloc(sizeof("ip=255.255.255.255"));
- sprintip(envp[3], "ip=", (unsigned char *) &packet->yiaddr);
- for (i = 0, j = 4; options[i].code; i++) {
- if ((temp = get_option(packet, options[i].code))) {
- envp[j] =
- xmalloc(max_option_length[(&options[i])->flags & TYPE_MASK] *
- (temp[OPT_LEN - 2] /
- option_lengths[(&options[i])->flags & TYPE_MASK]) +
- strlen((&options[i])->name) + 2);
- fill_options(envp[j], temp, &options[i]);
- j++;
- }
- }
- if (packet->siaddr) {
- envp[j] = xmalloc(sizeof("siaddr=255.255.255.255"));
- sprintip(envp[j++], "siaddr=", (unsigned char *) &packet->yiaddr);
- }
- if (!(over & FILE_FIELD) && packet->file[0]) {
- /* watch out for invalid packets */
- packet->file[sizeof(packet->file) - 1] = '\0';
- envp[j] = xmalloc(sizeof("boot_file=") + strlen(packet->file));
- sprintf(envp[j++], "boot_file=%s", packet->file);
- }
- if (!(over & SNAME_FIELD) && packet->sname[0]) {
- /* watch out for invalid packets */
- packet->sname[sizeof(packet->sname) - 1] = '\0';
- envp[j] = xmalloc(sizeof("sname=") + strlen(packet->sname));
- sprintf(envp[j++], "sname=%s", packet->sname);
- }
- envp[j] = NULL;
- return envp;
-}
-
-/* Call a script with a par file and env vars */
-static void run_script(struct dhcpMessage *packet, const char *name)
-{
- int pid;
- char **envp;
-
- if (client_config.script == NULL) {
- return;
- }
-
- /* call script */
- pid = fork();
- if (pid) {
- waitpid(pid, NULL, 0);
- return;
- } else if (pid == 0) {
- envp = fill_envp(packet);
-
- /* close fd's? */
-
- /* exec script */
- DEBUG(LOG_INFO, "execle'ing %s", client_config.script);
- execle(client_config.script, client_config.script, name, NULL, envp);
- LOG(LOG_ERR, "script %s failed: %s",
- client_config.script, strerror(errno));
- exit(1);
- }
-}
-
-/* SIGUSR2 handler (release) */
-static void release_requested(int sig)
-{
- sig = 0;
- LOG(LOG_INFO, "Received SIGUSR2");
- /* send release packet */
- if (state == BOUND || state == RENEWING || state == REBINDING) {
- struct dhcpMessage packet;
-
- init_packet(&packet, DHCPRELEASE);
- packet.xid = random_xid();
- packet.ciaddr = requested_ip;
-
- add_simple_option(packet.options, DHCP_REQUESTED_IP, requested_ip);
- add_simple_option(packet.options, DHCP_SERVER_ID, server_addr);
-
- DEBUG(LOG_DEBUG, "Sending release...");
- kernel_packet(&packet, requested_ip, CLIENT_PORT, server_addr,
- SERVER_PORT);
- run_script(NULL, "deconfig");
- }
-
- change_mode(LISTEN_NONE);
- state = RELEASED;
- timeout = 0x7fffffff;
-}
-
-
-static int pidfile_acquire(char *pidfile)
-{
- int pid_fd;
-
- if (pidfile == NULL) {
- return -1;
- }
- pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644);
- if (pid_fd < 0) {
- LOG(LOG_ERR, "Unable to open pidfile %s: %s\n",
- pidfile, strerror(errno));
- } else {
- lockf(pid_fd, F_LOCK, 0);
- }
-
- return pid_fd;
-}
-
-
-static void pidfile_write_release(int pid_fd)
-{
- FILE *out;
-
- if (pid_fd < 0) {
- return;
- }
- if ((out = fdopen(pid_fd, "w")) != NULL) {
- fprintf(out, "%d\n", getpid());
- fclose(out);
- }
- lockf(pid_fd, F_UNLCK, 0);
- close(pid_fd);
-}
-
-/* Exit and cleanup */
-static void exit_client(int retval)
-{
- unlink(client_config.pidfile);
- if (client_config.pidfile) {
- unlink(client_config.pidfile);
- }
- CLOSE_LOG();
- exit(retval);
-}
-
-
-/* SIGTERM handler */
-static void terminate(int sig)
-{
- sig = 0;
- LOG(LOG_INFO, "Received SIGTERM");
- exit_client(0);
-}
-
-
-static inline int read_interface(char *interface, int *ifindex,
- u_int32_t * addr, unsigned char *arp)
-{
- int l_fd;
- struct ifreq ifr;
- struct sockaddr_in *s_in;
-
- memset(&ifr, 0, sizeof(struct ifreq));
- if ((l_fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) {
- ifr.ifr_addr.sa_family = AF_INET;
- strcpy(ifr.ifr_name, interface);
-
- if (addr) {
- if (ioctl(l_fd, SIOCGIFADDR, &ifr) == 0) {
- s_in = (struct sockaddr_in *) &ifr.ifr_addr;
- *addr = s_in->sin_addr.s_addr;
- DEBUG(LOG_INFO, "%s (our ip) = %s", ifr.ifr_name,
- inet_ntoa(s_in->sin_addr));
- } else {
- LOG(LOG_ERR, "SIOCGIFADDR failed!: %s", strerror(errno));
- return -1;
- }
- }
-
- if (ioctl(l_fd, SIOCGIFINDEX, &ifr) == 0) {
- DEBUG(LOG_INFO, "adapter index %d", ifr.ifr_ifindex);
- *ifindex = ifr.ifr_ifindex;
- } else {
- LOG(LOG_ERR, "SIOCGIFINDEX failed!: %s", strerror(errno));
- return -1;
- }
- if (ioctl(l_fd, SIOCGIFHWADDR, &ifr) == 0) {
- memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
- DEBUG(LOG_INFO,
- "adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
- arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
- } else {
- LOG(LOG_ERR, "SIOCGIFHWADDR failed!: %s", strerror(errno));
- return -1;
- }
- } else {
- LOG(LOG_ERR, "socket failed!: %s", strerror(errno));
- return -1;
- }
- close(l_fd);
- return 0;
-}
-
-
-static inline int listen_socket(unsigned int ip, int port, char *inf)
-{
- struct ifreq interface;
- int l_fd;
- struct sockaddr_in addr;
- int n = 1;
-
- DEBUG(LOG_INFO, "Opening listen socket on 0x%08x:%d %s\n", ip, port, inf);
- if ((l_fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
- DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
- return -1;
- }
-
- memset(&addr, 0, sizeof(addr));
- addr.sin_family = AF_INET;
- addr.sin_port = htons(port);
- addr.sin_addr.s_addr = ip;
-
- if (setsockopt(l_fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) ==
- -1) {
- close(l_fd);
- return -1;
- }
- if (setsockopt(l_fd, SOL_SOCKET, SO_BROADCAST, (char *) &n, sizeof(n)) ==
- -1) {
- close(l_fd);
- return -1;
- }
-
- strncpy(interface.ifr_ifrn.ifrn_name, inf, IFNAMSIZ);
- if (setsockopt
- (l_fd, SOL_SOCKET, SO_BINDTODEVICE, (char *) &interface,
- sizeof(interface)) < 0) {
- close(l_fd);
- return -1;
- }
-
- if (bind(l_fd, (struct sockaddr *) &addr, sizeof(struct sockaddr)) == -1) {
- close(l_fd);
- return -1;
- }
-
- return l_fd;
-}
-
-
-static int raw_socket(int ifindex)
-{
- int l_fd;
- struct sockaddr_ll sock;
-
- DEBUG(LOG_INFO, "Opening raw socket on ifindex %d\n", ifindex);
- if ((l_fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
- DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
- return -1;
- }
-
- sock.sll_family = AF_PACKET;
- sock.sll_protocol = htons(ETH_P_IP);
- sock.sll_ifindex = ifindex;
- if (bind(l_fd, (struct sockaddr *) &sock, sizeof(sock)) < 0) {
- DEBUG(LOG_ERR, "bind call failed: %s", strerror(errno));
- close(l_fd);
- return -1;
- }
-
- return l_fd;
-
-}
-
-/* read a packet from socket fd, return -1 on read error, -2 on packet error */
-static int get_packet(struct dhcpMessage *packet, int l_fd)
-{
- int bytes;
- int i;
- const char broken_vendors[][8] = {
- "MSFT 98",
- ""
- };
- char unsigned *vendor;
-
- memset(packet, 0, sizeof(struct dhcpMessage));
- bytes = read(l_fd, packet, sizeof(struct dhcpMessage));
- if (bytes < 0) {
- DEBUG(LOG_INFO, "couldn't read on listening socket, ignoring");
- return -1;
- }
-
- if (ntohl(packet->cookie) != DHCP_MAGIC) {
- LOG(LOG_ERR, "received bogus message, ignoring");
- return -2;
- }
- DEBUG(LOG_INFO, "Received a packet");
-
- if (packet->op == BOOTREQUEST
- && (vendor = get_option(packet, DHCP_VENDOR))) {
- for (i = 0; broken_vendors[i][0]; i++) {
- if (vendor[OPT_LEN - 2] ==
- (unsigned char) strlen(broken_vendors[i])
- && !strncmp(vendor, broken_vendors[i], vendor[OPT_LEN - 2])) {
- DEBUG(LOG_INFO, "broken client (%s), forcing broadcast",
- broken_vendors[i]);
- packet->flags |= htons(BROADCAST_FLAG);
- }
- }
- }
-
- return bytes;
-}
-
-static inline int get_raw_packet(struct dhcpMessage *payload, int l_fd)
-{
- int bytes;
- struct udp_dhcp_packet packet;
- u_int32_t source, dest;
- u_int16_t check;
-
- memset(&packet, 0, sizeof(struct udp_dhcp_packet));
- bytes = read(l_fd, &packet, sizeof(struct udp_dhcp_packet));
- if (bytes < 0) {
- DEBUG(LOG_INFO, "couldn't read on raw listening socket -- ignoring");
- usleep(500000); /* possible down interface, looping condition */
- return -1;
- }
-
- if (bytes < (int) (sizeof(struct iphdr) + sizeof(struct udphdr))) {
- DEBUG(LOG_INFO, "message too short, ignoring");
- return -1;
- }
-
- if (bytes < ntohs(packet.ip.tot_len)) {
- DEBUG(LOG_INFO, "Truncated packet");
- return -1;
- }
-
- /* ignore any extra garbage bytes */
- bytes = ntohs(packet.ip.tot_len);
-
- /* Make sure its the right packet for us, and that it passes sanity checks */
- if (packet.ip.protocol != IPPROTO_UDP || packet.ip.version != IPVERSION ||
- packet.ip.ihl != sizeof(packet.ip) >> 2
- || packet.udp.dest != htons(CLIENT_PORT)
- || bytes > (int) sizeof(struct udp_dhcp_packet)
- || ntohs(packet.udp.len) != (short) (bytes - sizeof(packet.ip))) {
- DEBUG(LOG_INFO, "unrelated/bogus packet");
- return -1;
- }
-
- /* check IP checksum */
- check = packet.ip.check;
- packet.ip.check = 0;
- if (check != checksum(&(packet.ip), sizeof(packet.ip))) {
- DEBUG(LOG_INFO, "bad IP header checksum, ignoring");
- return -1;
- }
-
- /* verify the UDP checksum by replacing the header with a psuedo header */
- source = packet.ip.saddr;
- dest = packet.ip.daddr;
- check = packet.udp.check;
- packet.udp.check = 0;
- memset(&packet.ip, 0, sizeof(packet.ip));
-
- packet.ip.protocol = IPPROTO_UDP;
- packet.ip.saddr = source;
- packet.ip.daddr = dest;
- packet.ip.tot_len = packet.udp.len; /* cheat on the psuedo-header */
- if (check && check != checksum(&packet, bytes)) {
- DEBUG(LOG_ERR, "packet with bad UDP checksum received, ignoring");
- return -1;
- }
-
- memcpy(payload, &(packet.data),
- bytes - (sizeof(packet.ip) + sizeof(packet.udp)));
-
- if (ntohl(payload->cookie) != DHCP_MAGIC) {
- LOG(LOG_ERR, "received bogus message (bad magic) -- ignoring");
- return -1;
- }
- DEBUG(LOG_INFO, "oooooh!!! got some!");
- return bytes - (sizeof(packet.ip) + sizeof(packet.udp));
-}
-
-
-int udhcpc_main(int argc, char *argv[])
-{
- unsigned char *temp, *message;
- unsigned long t1 = 0, t2 = 0, xid = 0;
- unsigned long start = 0, lease;
- fd_set rfds;
- int retval;
- struct timeval tv;
- int c, len;
- struct dhcpMessage packet;
- struct in_addr temp_addr;
- int pid_fd;
- time_t now;
-
- static struct option l_options[] = {
- {"clientid", required_argument, 0, 'c'},
- {"foreground", no_argument, 0, 'f'},
- {"hostname", required_argument, 0, 'H'},
- {"help", no_argument, 0, 'h'},
- {"interface", required_argument, 0, 'i'},
- {"now", no_argument, 0, 'n'},
- {"pidfile", required_argument, 0, 'p'},
- {"quit", no_argument, 0, 'q'},
- {"request", required_argument, 0, 'r'},
- {"script", required_argument, 0, 's'},
- {"version", no_argument, 0, 'v'},
- {0, 0, 0, 0}
- };
-
- /* get options */
- while (1) {
- int option_index = 0;
-
- c = getopt_long(argc, argv, "c:fH:i:np:qr:s:v", l_options,
- &option_index);
- if (c == -1) {
- break;
- }
-
- switch (c) {
- case 'c':
- len = strlen(optarg);
- if (len > 255) {
- len = 255;
- }
- if (client_config.clientid) {
- free(client_config.clientid);
- }
- client_config.clientid = xmalloc(len + 2);
- client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
- client_config.clientid[OPT_LEN] = len;
- client_config.clientid[OPT_DATA] = '\0';
- strncpy(client_config.clientid + 3, optarg, len - 1);
- break;
- case 'f':
- client_config.foreground = 1;
- break;
- case 'H':
- len = strlen(optarg);
- if (len > 255) {
- len = 255;
- }
- if (client_config.hostname) {
- free(client_config.hostname);
- }
- client_config.hostname = xmalloc(len + 2);
- client_config.hostname[OPT_CODE] = DHCP_HOST_NAME;
- client_config.hostname[OPT_LEN] = len;
- strncpy(client_config.hostname + 2, optarg, len);
- break;
- case 'i':
- client_config.interface = optarg;
- break;
- case 'n':
- client_config.abort_if_no_lease = 1;
- break;
- case 'p':
- client_config.pidfile = optarg;
- break;
- case 'q':
- client_config.quit_after_lease = 1;
- break;
- case 'r':
- requested_ip = inet_addr(optarg);
- break;
- case 's':
- client_config.script = optarg;
- break;
- case 'v':
- printf("udhcpcd, version %s\n\n", VERSION);
- exit_client(0);
- break;
- default:
- show_usage();
- }
- }
-
- OPEN_LOG("udhcpc");
- LOG(LOG_INFO, "udhcp client (v%s) started", VERSION);
-
- pid_fd = pidfile_acquire(client_config.pidfile);
- pidfile_write_release(pid_fd);
-
- if (read_interface
- (client_config.interface, &client_config.ifindex, NULL,
- client_config.arp) < 0) {
- exit_client(1);
- }
-
- if (!client_config.clientid) {
- client_config.clientid = xmalloc(6 + 3);
- client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
- client_config.clientid[OPT_LEN] = 7;
- client_config.clientid[OPT_DATA] = 1;
- memcpy(client_config.clientid + 3, client_config.arp, 6);
- }
-
- /* setup signal handlers */
- signal(SIGUSR1, renew_requested);
- signal(SIGUSR2, release_requested);
- signal(SIGTERM, terminate);
-
- state = INIT_SELECTING;
- run_script(NULL, "deconfig");
- change_mode(LISTEN_RAW);
-
- for (;;) {
- tv.tv_sec = timeout - time(0);
- tv.tv_usec = 0;
- FD_ZERO(&rfds);
-
- if (listen_mode != LISTEN_NONE && fd_main < 0) {
- if (listen_mode == LISTEN_KERNEL) {
- fd_main =
- listen_socket(INADDR_ANY, CLIENT_PORT,
- client_config.interface);
- } else {
- fd_main = raw_socket(client_config.ifindex);
- }
- if (fd_main < 0) {
- LOG(LOG_ERR, "FATAL: couldn't listen on socket, %s",
- strerror(errno));
- exit_client(0);
- }
- }
- if (fd_main >= 0) {
- FD_SET(fd_main, &rfds);
- }
-
- if (tv.tv_sec > 0) {
- DEBUG(LOG_INFO, "Waiting on select...\n");
- retval = select(fd_main + 1, &rfds, NULL, NULL, &tv);
- } else {
- retval = 0; /* If we already timed out, fall through */
- }
-
- now = time(0);
- if (retval == 0) {
- /* timeout dropped to zero */
- switch (state) {
- case INIT_SELECTING:
- if (packet_num < 3) {
- if (packet_num == 0) {
- xid = random_xid();
- }
- /* send discover packet */
- send_discover(xid, requested_ip); /* broadcast */
-
- timeout = now + ((packet_num == 2) ? 10 : 2);
- packet_num++;
- } else {
- if (client_config.abort_if_no_lease) {
- LOG(LOG_INFO, "No lease, failing.");
- exit_client(1);
- }
- /* wait to try again */
- packet_num = 0;
- timeout = now + 60;
- }
- break;
- case RENEW_REQUESTED:
- case REQUESTING:
- if (packet_num < 3) {
- /* send request packet */
- if (state == RENEW_REQUESTED) {
- send_renew(xid, server_addr, requested_ip); /* unicast */
- } else {
- send_selecting(xid, server_addr, requested_ip); /* broadcast */
- }
- timeout = now + ((packet_num == 2) ? 10 : 2);
- packet_num++;
- } else {
- /* timed out, go back to init state */
- state = INIT_SELECTING;
- timeout = now;
- packet_num = 0;
- change_mode(LISTEN_RAW);
- }
- break;
- case BOUND:
- /* Lease is starting to run out, time to enter renewing state */
- state = RENEWING;
- change_mode(LISTEN_KERNEL);
- DEBUG(LOG_INFO, "Entering renew state");
- /* fall right through */
- case RENEWING:
- /* Either set a new T1, or enter REBINDING state */
- if ((t2 - t1) <= (lease / 14400 + 1)) {
- /* timed out, enter rebinding state */
- state = REBINDING;
- timeout = now + (t2 - t1);
- DEBUG(LOG_INFO, "Entering rebinding state");
- } else {
- /* send a request packet */
- send_renew(xid, server_addr, requested_ip); /* unicast */
-
- t1 = (t2 - t1) / 2 + t1;
- timeout = t1 + start;
- }
- break;
- case REBINDING:
- /* Either set a new T2, or enter INIT state */
- if ((lease - t2) <= (lease / 14400 + 1)) {
- /* timed out, enter init state */
- state = INIT_SELECTING;
- LOG(LOG_INFO, "Lease lost, entering init state");
- run_script(NULL, "deconfig");
- timeout = now;
- packet_num = 0;
- change_mode(LISTEN_RAW);
- } else {
- /* send a request packet */
- send_renew(xid, 0, requested_ip); /* broadcast */
-
- t2 = (lease - t2) / 2 + t2;
- timeout = t2 + start;
- }
- break;
- case RELEASED:
- /* yah, I know, *you* say it would never happen */
- timeout = 0x7fffffff;
- break;
- }
- } else if (retval > 0 && listen_mode != LISTEN_NONE
- && FD_ISSET(fd_main, &rfds)) {
- /* a packet is ready, read it */
-
- if (listen_mode == LISTEN_KERNEL) {
- len = get_packet(&packet, fd_main);
- } else {
- len = get_raw_packet(&packet, fd_main);
- }
- if (len == -1 && errno != EINTR) {
- DEBUG(LOG_INFO, "error on read, %s, reopening socket",
- strerror(errno));
- change_mode(listen_mode); /* just close and reopen */
- }
- if (len < 0) {
- continue;
- }
-
- if (packet.xid != xid) {
- DEBUG(LOG_INFO, "Ignoring XID %lx (our xid is %lx)",
- (unsigned long) packet.xid, xid);
- continue;
- }
-
- if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
- DEBUG(LOG_ERR, "couldnt get option from packet -- ignoring");
- continue;
- }
-
- switch (state) {
- case INIT_SELECTING:
- /* Must be a DHCPOFFER to one of our xid's */
- if (*message == DHCPOFFER) {
- if ((temp = get_option(&packet, DHCP_SERVER_ID))) {
- memcpy(&server_addr, temp, 4);
- xid = packet.xid;
- requested_ip = packet.yiaddr;
-
- /* enter requesting state */
- state = REQUESTING;
- timeout = now;
- packet_num = 0;
- } else {
- DEBUG(LOG_ERR, "No server ID in message");
- }
- }
- break;
- case RENEW_REQUESTED:
- case REQUESTING:
- case RENEWING:
- case REBINDING:
- if (*message == DHCPACK) {
- if (!(temp = get_option(&packet, DHCP_LEASE_TIME))) {
- LOG(LOG_ERR,
- "No lease time with ACK, using 1 hour lease");
- lease = 60 * 60;
- } else {
- memcpy(&lease, temp, 4);
- lease = ntohl(lease);
- }
-
- /* enter bound state */
- t1 = lease / 2;
-
- /* little fixed point for n * .875 */
- t2 = (lease * 0x7) >> 3;
- temp_addr.s_addr = packet.yiaddr;
- LOG(LOG_INFO, "Lease of %s obtained, lease time %ld",
- inet_ntoa(temp_addr), lease);
- start = now;
- timeout = t1 + start;
- requested_ip = packet.yiaddr;
- run_script(&packet,
- ((state == RENEWING
- || state == REBINDING) ? "renew" : "bound"));
-
- state = BOUND;
- change_mode(LISTEN_NONE);
- {
- int pid_fd2;
-
- if (client_config.quit_after_lease) {
- exit_client(0);
- } else if (!client_config.foreground) {
- pid_fd2 = pidfile_acquire(client_config.pidfile); /* hold lock during fork. */
- if (daemon(0, 0) == -1) {
- perror("fork");
- exit_client(1);
- }
- client_config.foreground = 1; /* Do not fork again. */
- pidfile_write_release(pid_fd2);
- }
- }
- } else if (*message == DHCPNAK) {
- /* return to init state */
- LOG(LOG_INFO, "Received DHCP NAK");
- run_script(&packet, "nak");
- if (state != REQUESTING) {
- run_script(NULL, "deconfig");
- }
- state = INIT_SELECTING;
- timeout = now;
- requested_ip = 0;
- packet_num = 0;
- change_mode(LISTEN_RAW);
- sleep(3); /* avoid excessive network traffic */
- }
- break;
- /* case BOUND, RELEASED: - ignore all packets */
- }
- } else if (retval == -1 && errno == EINTR) {
- /* a signal was caught */
-
- } else {
- /* An error occured */
- DEBUG(LOG_ERR, "Error on select");
- }
-
- }
- return 0;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-07 18:43:32 +0000