--- /dev/null
+/******************************************************************************
+ *
+ * Original name: CHECK_DHCP.C
+ * Current name: DHCPDISCOVER.C
+ *
+ * License: GPL
+ * Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)
+ * Copyright (c) 2006-2013 OpenWRT.org
+ *
+ * License Information:
+ *
+ * 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.
+ *
+ *****************************************************************************/
+
+const char* COPYRIGHT = " \
+*\n \
+* License: GPL\n \
+* Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n \
+* Copyright (c) 2006-2013 OpenWRT.org \n \
+* ====================================================== \n \
+* Mike Gore 25 Aug 2005 \n \
+* Modified for standalone operation \n \
+* ====================================================== \n \
+* Pau Escrich Jun 2013 \n \
+* Added -b option and ported to OpenWRT \n \
+* ====================================================== \n \
+*\n \
+** License Information:\n \
+*\n \
+* This program is free software; you can redistribute it and/or modify\n \
+* it under the terms of the GNU General Public License as published by\n \
+* the Free Software Foundation; either version 2 of the License, or\n \
+* (at your option) any later version.\n \
+*\n \
+* This program is distributed in the hope that it will be useful,\n \
+* but WITHOUT ANY WARRANTY; without even the implied warranty of\n \
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n \
+* GNU General Public License for more details.\n \
+*\n \
+* You should have received a copy of the GNU General Public License\n \
+* along with this program; if not, write to the Free Software\n \
+* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.\n \
+*\n \
+* $Id: dhcpdiscover.c,v 2$\n \
+*";
+
+const char* progname = "dhcpdiscover";
+const char* revision = "$Revision: 2$";
+const char* copyright = "2006-2013";
+const char* email = "p4u@dabax.net";
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <locale.h>
+#include <net/if.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#if defined(__linux__)
+
+#include <features.h>
+#include <linux/if_ether.h>
+
+#elif defined(__bsd__)
+
+#include <net/if_dl.h>
+#include <netinet/if_ether.h>
+#include <sys/sysctl.h>
+
+#elif defined(__sun__) || defined(__solaris__) || defined(__hpux__)
+
+#define INSAP 22
+#define OUTSAP 24
+
+#include <ctype.h>
+#include <signal.h>
+#include <sys/dlpi.h>
+#include <sys/poll.h>
+#include <sys/stropts.h>
+
+#define bcopy(source, destination, length) memcpy(destination, source, length)
+
+#define AREA_SZ 5000 /* buffer length in bytes */
+static u_long ctl_area[AREA_SZ];
+static u_long dat_area[AREA_SZ];
+static struct strbuf ctl = { AREA_SZ, 0, (char*)ctl_area };
+static struct strbuf dat = { AREA_SZ, 0, (char*)dat_area };
+
+#define GOT_CTRL 1
+#define GOT_DATA 2
+#define GOT_BOTH 3
+#define GOT_INTR 4
+#define GOT_ERR 128
+
+#define u_int8_t uint8_t
+#define u_int16_t uint16_t
+#define u_int32_t uint32_t
+
+static int get_msg(int);
+static int check_ctrl(int);
+static int put_ctrl(int, int, int);
+static int put_both(int, int, int, int);
+static int dl_open(const char*, int, int*);
+static int dl_bind(int, int, u_char*);
+long mac_addr_dlpi(const char*, int, u_char*);
+
+#endif
+
+#define HAVE_GETOPT_H
+
+#define usage printf
+
+/**** Common definitions ****/
+
+#define STATE_OK 0
+#define STATE_WARNING 1
+#define STATE_CRITICAL 2
+#define STATE_UNKNOWN -1
+
+#define OK 0
+#define ERROR -1
+
+#define FALSE 0
+#define TRUE 1
+
+/**** DHCP definitions ****/
+
+#define MAX_DHCP_CHADDR_LENGTH 16
+#define MAX_DHCP_SNAME_LENGTH 64
+#define MAX_DHCP_FILE_LENGTH 128
+#define MAX_DHCP_OPTIONS_LENGTH 312
+
+typedef struct dhcp_packet_struct {
+ u_int8_t op; /* packet type */
+ u_int8_t htype; /* type of hardware address for this machine (Ethernet, etc) */
+ u_int8_t hlen; /* length of hardware address (of this machine) */
+ u_int8_t hops; /* hops */
+ u_int32_t xid; /* random transaction id number - chosen by this machine */
+ u_int16_t secs; /* seconds used in timing */
+ u_int16_t flags; /* flags */
+ struct in_addr ciaddr; /* IP address of this machine (if we already have one) */
+ struct in_addr yiaddr; /* IP address of this machine (offered by the DHCP server) */
+ struct in_addr siaddr; /* IP address of DHCP server */
+ struct in_addr giaddr; /* IP address of DHCP relay */
+ unsigned char chaddr[MAX_DHCP_CHADDR_LENGTH]; /* hardware address of this machine */
+ char sname[MAX_DHCP_SNAME_LENGTH]; /* name of DHCP server */
+ char file[MAX_DHCP_FILE_LENGTH]; /* boot file name (used for diskless booting?) */
+ char options[MAX_DHCP_OPTIONS_LENGTH]; /* options */
+} dhcp_packet;
+
+typedef struct dhcp_offer_struct {
+ struct in_addr server_address; /* address of DHCP server that sent this offer */
+ struct in_addr offered_address; /* the IP address that was offered to us */
+ u_int32_t lease_time; /* lease time in seconds */
+ u_int32_t renewal_time; /* renewal time in seconds */
+ u_int32_t rebinding_time; /* rebinding time in seconds */
+ struct dhcp_offer_struct* next;
+} dhcp_offer;
+
+typedef struct requested_server_struct {
+ struct in_addr server_address;
+ struct requested_server_struct* next;
+} requested_server;
+
+#define BOOTREQUEST 1
+#define BOOTREPLY 2
+
+#define DHCPDISCOVER 1
+#define DHCPOFFER 2
+#define DHCPREQUEST 3
+#define DHCPDECLINE 4
+#define DHCPACK 5
+#define DHCPNACK 6
+#define DHCPRELEASE 7
+
+#define DHCP_OPTION_MESSAGE_TYPE 53
+#define DHCP_OPTION_HOST_NAME 12
+#define DHCP_OPTION_BROADCAST_ADDRESS 28
+#define DHCP_OPTION_REQUESTED_ADDRESS 50
+#define DHCP_OPTION_LEASE_TIME 51
+#define DHCP_OPTION_RENEWAL_TIME 58
+#define DHCP_OPTION_REBINDING_TIME 59
+
+#define DHCP_INFINITE_TIME 0xFFFFFFFF
+
+#define DHCP_BROADCAST_FLAG 32768
+
+#define DHCP_SERVER_PORT 67
+#define DHCP_CLIENT_PORT 68
+
+#define ETHERNET_HARDWARE_ADDRESS 1 /* used in htype field of dhcp packet */
+#define ETHERNET_HARDWARE_ADDRESS_LENGTH 6 /* length of Ethernet hardware addresses */
+
+unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH] = "";
+unsigned int my_client_mac[MAX_DHCP_CHADDR_LENGTH];
+int mymac = 0;
+
+struct in_addr banned_ip;
+int banned = 0;
+char baddr[16];
+
+char network_interface_name[16] = "eth0";
+
+u_int32_t packet_xid = 0;
+
+u_int32_t dhcp_lease_time = 0;
+u_int32_t dhcp_renewal_time = 0;
+u_int32_t dhcp_rebinding_time = 0;
+
+int dhcpoffer_timeout = 2;
+
+dhcp_offer* dhcp_offer_list = NULL;
+requested_server* requested_server_list = NULL;
+
+int valid_responses = 0; /* number of valid DHCPOFFERs we received */
+int requested_servers = 0;
+int requested_responses = 0;
+
+int request_specific_address = FALSE;
+int received_requested_address = FALSE;
+int verbose = 0;
+int prometheus = 0;
+struct in_addr requested_address;
+
+void print_revision(const char* progname, const char* revision) { printf("Program: %s %s\n", progname, revision); }
+
+int process_arguments(int, char**);
+int call_getopt(int, char**);
+int validate_arguments(void);
+void print_usage(void);
+void print_help(void);
+
+int get_hardware_address(int, char*);
+
+int send_dhcp_discover(int);
+int get_dhcp_offer(int);
+
+int get_results(void);
+
+int add_dhcp_offer(struct in_addr, dhcp_packet*);
+int free_dhcp_offer_list(void);
+int free_requested_server_list(void);
+
+int create_dhcp_socket(void);
+int close_dhcp_socket(int);
+int send_dhcp_packet(void*, int, int, struct sockaddr_in*);
+int receive_dhcp_packet(void*, int, int, int, struct sockaddr_in*);
+
+int main(int argc, char** argv)
+{
+ int dhcp_socket;
+ int result;
+
+ setlocale(LC_ALL, "");
+ // bindtextdomain (PACKAGE, LOCALEDIR);
+ // textdomain (PACKAGE);
+
+ if (process_arguments(argc, argv) != OK) {
+ printf("Could not parse arguments");
+ }
+
+ // Set banned addr in string format in global var baddr
+ if (banned) {
+ inet_ntop(AF_INET, &(banned_ip), baddr, INET_ADDRSTRLEN);
+ if (verbose)
+ printf("Banned addr:%s\n", baddr);
+ }
+
+ /* create socket for DHCP communications */
+ dhcp_socket = create_dhcp_socket();
+
+ /* get hardware address of client machine */
+ get_hardware_address(dhcp_socket, network_interface_name);
+
+ /* send DHCPDISCOVER packet */
+ send_dhcp_discover(dhcp_socket);
+
+ /* wait for a DHCPOFFER packet */
+ get_dhcp_offer(dhcp_socket);
+
+ /* close socket we created */
+ close_dhcp_socket(dhcp_socket);
+
+ /* determine state/plugin output to return */
+ if (!prometheus) {
+ result = get_results();
+ }
+
+ /* free allocated memory */
+ free_dhcp_offer_list();
+ free_requested_server_list();
+
+ return result;
+}
+
+/* determines hardware address on client machine */
+int get_hardware_address(int sock, char* interface_name)
+{
+
+ int i;
+
+#if defined(__linux__)
+ struct ifreq ifr;
+
+ strncpy((char*)&ifr.ifr_name, interface_name, sizeof(ifr.ifr_name));
+
+ // Added code to try to set local MAC address just to be through
+ // If this fails the test will still work since
+ // we do encode the MAC as part of the DHCP frame - tests show it works
+ if (mymac) {
+ int i;
+ for (i = 0; i < MAX_DHCP_CHADDR_LENGTH; ++i)
+ client_hardware_address[i] = my_client_mac[i];
+ memcpy(&ifr.ifr_hwaddr.sa_data, &client_hardware_address[0], 6);
+ if (ioctl(sock, SIOCSIFHWADDR, &ifr) < 0) {
+ printf("Error: Could not set hardware address of interface '%s'\n", interface_name);
+ // perror("Error");
+ // exit(STATE_UNKNOWN);
+ }
+
+ } else {
+ /* try and grab hardware address of requested interface */
+ if (ioctl(sock, SIOCGIFHWADDR, &ifr) < 0) {
+ printf("Error: Could not get hardware address of interface '%s'\n", interface_name);
+ exit(STATE_UNKNOWN);
+ }
+ memcpy(&client_hardware_address[0], &ifr.ifr_hwaddr.sa_data, 6);
+ }
+
+#elif defined(__bsd__)
+ /* King 2004 see ACKNOWLEDGEMENTS */
+
+ int mib[6], len;
+ char* buf;
+ unsigned char* ptr;
+ struct if_msghdr* ifm;
+ struct sockaddr_dl* sdl;
+
+ mib[0] = CTL_NET;
+ mib[1] = AF_ROUTE;
+ mib[2] = 0;
+ mib[3] = AF_LINK;
+ mib[4] = NET_RT_IFLIST;
+
+ if ((mib[5] = if_nametoindex(interface_name)) == 0) {
+ printf("Error: if_nametoindex error - %s.\n", strerror(errno);
+ exit(STATE_UNKNOWN);
+ }
+
+ if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
+ printf("Error: Couldn't get hardware address from %s. sysctl 1 error - %s.\n", interface_name, strerror(errno);
+ exit(STATE_UNKNOWN);
+ }
+
+ if ((buf = malloc(len)) == NULL) {
+ printf("Error: Couldn't get hardware address from interface %s. malloc error - %s.\n", interface_name, strerror(errno);
+ exit(4);
+ }
+
+ if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
+ printf("Error: Couldn't get hardware address from %s. sysctl 2 error - %s.\n", interface_name, strerror(errno);
+ exit(STATE_UNKNOWN);
+ }
+
+ ifm = (struct if_msghdr*)buf;
+ sdl = (struct sockaddr_dl*)(ifm + 1);
+ ptr = (unsigned char*)LLADDR(sdl);
+ memcpy(&client_hardware_address[0], ptr, 6);
+ /* King 2004 */
+
+#elif defined(__sun__) || defined(__solaris__)
+
+ /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
+ long stat;
+ char dev[20] = "/dev/";
+ char* p;
+ int unit;
+
+ for (p = interface_name; *p && isalpha(*p); p++)
+ /* no-op */;
+ if (p != '\0') {
+ unit = atoi(p);
+ *p = '\0';
+ strncat(dev, interface_name, 6);
+ } else {
+ printf("Error: can't find unit number in interface_name (%s) - expecting TypeNumber eg lnc0.\n", interface_name);
+ exit(STATE_UNKNOWN);
+ }
+ stat = mac_addr_dlpi(dev, unit, client_hardware_address);
+ if (stat != 0) {
+ printf("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n", dev, unit);
+ exit(STATE_UNKNOWN);
+ }
+
+#elif defined(__hpux__)
+
+ long stat;
+ char dev[20] = "/dev/dlpi";
+ int unit = 0;
+
+ stat = mac_addr_dlpi(dev, unit, client_hardware_address);
+ if (stat != 0) {
+ printf("Error: can't read MAC address from DLPI streams interface for device %s unit %d.\n", dev, unit);
+ exit(STATE_UNKNOWN);
+ }
+ /* Kompf 2000-2003 */
+
+#else
+ printf("Error: can't get MAC address for this architecture.\n");
+ exit(STATE_UNKNOWN);
+#endif
+
+ if (verbose) {
+ printf("Hardware address: ");
+ for (i = 0; i < 6; ++i)
+ printf("%2.2x", client_hardware_address[i]);
+ printf("\n");
+ }
+
+ return OK;
+}
+
+/* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */
+int send_dhcp_discover(int sock)
+{
+ dhcp_packet discover_packet;
+ struct sockaddr_in sockaddr_broadcast;
+
+ /* clear the packet data structure */
+ bzero(&discover_packet, sizeof(discover_packet));
+
+ /* boot request flag (backward compatible with BOOTP servers) */
+ discover_packet.op = BOOTREQUEST;
+
+ /* hardware address type */
+ discover_packet.htype = ETHERNET_HARDWARE_ADDRESS;
+
+ /* length of our hardware address */
+ discover_packet.hlen = ETHERNET_HARDWARE_ADDRESS_LENGTH;
+
+ discover_packet.hops = 0;
+
+ /* transaction id is supposed to be random */
+ srand(time(NULL));
+ packet_xid = random();
+ discover_packet.xid = htonl(packet_xid);
+
+ /**** WHAT THE HECK IS UP WITH THIS?!? IF I DON'T MAKE THIS CALL, ONLY ONE SERVER RESPONSE IS PROCESSED!!!! ****/
+ /* downright bizzarre... */
+ ntohl(discover_packet.xid);
+
+ /*discover_packet.secs=htons(65535);*/
+ discover_packet.secs = 0xFF;
+
+ /* tell server it should broadcast its response */
+ discover_packet.flags = htons(DHCP_BROADCAST_FLAG);
+
+ /* our hardware address */
+ memcpy(discover_packet.chaddr, client_hardware_address, ETHERNET_HARDWARE_ADDRESS_LENGTH);
+
+ /* first four bytes of options field is magic cookie (as per RFC 2132) */
+ discover_packet.options[0] = '\x63';
+ discover_packet.options[1] = '\x82';
+ discover_packet.options[2] = '\x53';
+ discover_packet.options[3] = '\x63';
+
+ /* DHCP message type is embedded in options field */
+ discover_packet.options[4] = DHCP_OPTION_MESSAGE_TYPE; /* DHCP message type option identifier */
+ discover_packet.options[5] = '\x01'; /* DHCP message option length in bytes */
+ discover_packet.options[6] = DHCPDISCOVER;
+
+ /* the IP address we're requesting */
+ if (request_specific_address == TRUE) {
+ discover_packet.options[7] = DHCP_OPTION_REQUESTED_ADDRESS;
+ discover_packet.options[8] = '\x04';
+ memcpy(&discover_packet.options[9], &requested_address, sizeof(requested_address));
+ }
+
+ /* send the DHCPDISCOVER packet to broadcast address */
+ sockaddr_broadcast.sin_family = AF_INET;
+ sockaddr_broadcast.sin_port = htons(DHCP_SERVER_PORT);
+ sockaddr_broadcast.sin_addr.s_addr = INADDR_BROADCAST;
+ bzero(&sockaddr_broadcast.sin_zero, sizeof(sockaddr_broadcast.sin_zero));
+
+ if (verbose) {
+ printf("DHCPDISCOVER to %s port %d\n", inet_ntoa(sockaddr_broadcast.sin_addr), ntohs(sockaddr_broadcast.sin_port));
+ printf("DHCPDISCOVER XID: %lu (0x%X)\n", (unsigned long)ntohl(discover_packet.xid), ntohl(discover_packet.xid));
+ printf("DHCDISCOVER ciaddr: %s\n", inet_ntoa(discover_packet.ciaddr));
+ printf("DHCDISCOVER yiaddr: %s\n", inet_ntoa(discover_packet.yiaddr));
+ printf("DHCDISCOVER siaddr: %s\n", inet_ntoa(discover_packet.siaddr));
+ printf("DHCDISCOVER giaddr: %s\n", inet_ntoa(discover_packet.giaddr));
+ }
+
+ /* send the DHCPDISCOVER packet out */
+ send_dhcp_packet(&discover_packet, sizeof(discover_packet), sock, &sockaddr_broadcast);
+
+ if (verbose)
+ printf("\n\n");
+
+ return OK;
+}
+
+/* waits for a DHCPOFFER message from one or more DHCP servers */
+int get_dhcp_offer(int sock)
+{
+ dhcp_packet offer_packet;
+ struct sockaddr_in source;
+ int result = OK;
+ int timeout = 1;
+ int responses = 0;
+ int x;
+ time_t start_time;
+ time_t current_time;
+
+ time(&start_time);
+
+ /* receive as many responses as we can */
+ for (responses = 0, valid_responses = 0;;) {
+
+ time(¤t_time);
+ if ((current_time - start_time) >= dhcpoffer_timeout)
+ break;
+
+ if (verbose)
+ printf("\n\n");
+
+ bzero(&source, sizeof(source));
+ bzero(&offer_packet, sizeof(offer_packet));
+
+ result = OK;
+ result = receive_dhcp_packet(&offer_packet, sizeof(offer_packet), sock, dhcpoffer_timeout, &source);
+
+ // checks if the source address is the banned one
+ char saddr[16];
+ inet_ntop(AF_INET, &(source.sin_addr), saddr, INET_ADDRSTRLEN);
+
+ if (banned && strcmp(saddr, baddr) == 0) {
+ printf("DHCP offer comming from the banned addr %s, ignoring it\n", baddr);
+ result = 1;
+ }
+
+ if (result != OK) {
+ if (verbose)
+ printf("Result=ERROR\n");
+
+ continue;
+ } else {
+ if (verbose)
+ printf("Result=OK\n");
+
+ responses++;
+ }
+
+ if (verbose) {
+ printf("DHCPOFFER from IP address %s\n", inet_ntoa(source.sin_addr));
+ printf("DHCPOFFER XID: %lu (0x%X)\n", (unsigned long)ntohl(offer_packet.xid), ntohl(offer_packet.xid));
+ }
+
+ /* check packet xid to see if its the same as the one we used in the discover packet */
+ if (ntohl(offer_packet.xid) != packet_xid) {
+ if (verbose)
+ printf("DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - ignoring packet\n", (unsigned long)ntohl(offer_packet.xid), (unsigned long)packet_xid);
+
+ continue;
+ }
+
+ /* check hardware address */
+ result = OK;
+ if (verbose)
+ printf("DHCPOFFER chaddr: ");
+
+ for (x = 0; x < ETHERNET_HARDWARE_ADDRESS_LENGTH; x++) {
+ if (verbose)
+ printf("%02X", (unsigned char)offer_packet.chaddr[x]);
+
+ if (offer_packet.chaddr[x] != client_hardware_address[x])
+ result = ERROR;
+ }
+ if (verbose)
+ printf("\n");
+
+ if (result == ERROR) {
+ if (verbose)
+ printf("DHCPOFFER hardware address did not match our own - ignoring packet\n");
+
+ continue;
+ }
+
+ if (verbose) {
+ printf("DHCPOFFER ciaddr: %s\n", inet_ntoa(offer_packet.ciaddr));
+ printf("DHCPOFFER yiaddr: %s\n", inet_ntoa(offer_packet.yiaddr));
+ printf("DHCPOFFER siaddr: %s\n", inet_ntoa(offer_packet.siaddr));
+ printf("DHCPOFFER giaddr: %s\n", inet_ntoa(offer_packet.giaddr));
+ }
+
+ add_dhcp_offer(source.sin_addr, &offer_packet);
+
+ valid_responses++;
+ }
+
+ if (verbose) {
+ printf("Total responses seen on the wire: %d\n", responses);
+ printf("Valid responses for this machine: %d\n", valid_responses);
+ }
+
+ return OK;
+}
+
+/* sends a DHCP packet */
+int send_dhcp_packet(void* buffer, int buffer_size, int sock, struct sockaddr_in* dest)
+{
+ struct sockaddr_in myname;
+ int result;
+
+ result = sendto(sock, (char*)buffer, buffer_size, 0, (struct sockaddr*)dest, sizeof(*dest));
+
+ if (verbose)
+ printf("send_dhcp_packet result: %d\n", result);
+
+ if (result < 0)
+ return ERROR;
+
+ return OK;
+}
+
+/* receives a DHCP packet */
+int receive_dhcp_packet(void* buffer, int buffer_size, int sock, int timeout, struct sockaddr_in* address)
+{
+ struct timeval tv;
+ fd_set readfds;
+ int recv_result;
+ unsigned long srcmac;
+ socklen_t address_size;
+ struct sockaddr_in source_address;
+
+ /* wait for data to arrive (up time timeout) */
+ tv.tv_sec = timeout;
+ tv.tv_usec = 0;
+ FD_ZERO(&readfds);
+ FD_SET(sock, &readfds);
+ select(sock + 1, &readfds, NULL, NULL, &tv);
+
+ /* make sure some data has arrived */
+ if (!FD_ISSET(sock, &readfds)) {
+ if (verbose)
+ printf("No (more) data received\n");
+ return ERROR;
+ }
+
+ else {
+
+ /* why do we need to peek first? i don't know, its a hack. without it, the source address of the first packet received was
+ not being interpreted correctly. sigh... */
+ bzero(&source_address, sizeof(source_address));
+ address_size = sizeof(source_address);
+ recv_result = recvfrom(sock, (char*)buffer, buffer_size, MSG_PEEK, (struct sockaddr*)&source_address, &address_size);
+
+ if (verbose)
+ printf("recv_result_1: %d\n", recv_result);
+ recv_result = recvfrom(sock, (char*)buffer, buffer_size, 0, (struct sockaddr*)&source_address, &address_size);
+ if (verbose)
+ printf("recv_result_2: %d\n", recv_result);
+
+ if (recv_result == -1) {
+ if (verbose) {
+ printf("recvfrom() failed, ");
+ printf("errno: (%d) -> %s\n", errno, strerror(errno));
+ }
+ return ERROR;
+ } else {
+ if (verbose) {
+ printf("receive_dhcp_packet() result: %d\n", recv_result);
+ printf("receive_dhcp_packet() source: %s\n", inet_ntoa(source_address.sin_addr));
+ }
+
+ memcpy(address, &source_address, sizeof(source_address));
+ return OK;
+ }
+ }
+
+ return OK;
+}
+
+/* creates a socket for DHCP communication */
+int create_dhcp_socket(void)
+{
+ struct sockaddr_in myname;
+ struct ifreq interface;
+ int sock;
+ int flag = 1;
+
+ /* Set up the address we're going to bind to. */
+ bzero(&myname, sizeof(myname));
+ myname.sin_family = AF_INET;
+ myname.sin_port = htons(DHCP_CLIENT_PORT);
+ myname.sin_addr.s_addr = INADDR_ANY; /* listen on any address */
+ bzero(&myname.sin_zero, sizeof(myname.sin_zero));
+
+ /* create a socket for DHCP communications */
+ sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+ if (sock < 0) {
+ printf("Error: Could not create socket!\n");
+ exit(STATE_UNKNOWN);
+ }
+
+ if (verbose)
+ printf("DHCP socket: %d\n", sock);
+
+ /* set the reuse address flag so we don't get errors when restarting */
+ flag = 1;
+ if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)&flag, sizeof(flag)) < 0) {
+ printf("Error: Could not set reuse address option on DHCP socket!\n");
+ exit(STATE_UNKNOWN);
+ }
+
+ /* set the broadcast option - we need this to listen to DHCP broadcast messages */
+ if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char*)&flag, sizeof flag) < 0) {
+ printf("Error: Could not set broadcast option on DHCP socket!\n");
+ exit(STATE_UNKNOWN);
+ }
+
+ /* bind socket to interface */
+#if defined(__linux__)
+ strncpy(interface.ifr_ifrn.ifrn_name, network_interface_name, IFNAMSIZ);
+ if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, (char*)&interface, sizeof(interface)) < 0) {
+ printf("Error: Could not bind socket to interface %s. Check your privileges...\n", network_interface_name);
+ exit(STATE_UNKNOWN);
+ }
+
+#else
+ strncpy(interface.ifr_name, network_interface_name, IFNAMSIZ);
+#endif
+
+ /* bind the socket */
+ if (bind(sock, (struct sockaddr*)&myname, sizeof(myname)) < 0) {
+ printf("Error: Could not bind to DHCP socket (port %d)! Check your privileges...\n", DHCP_CLIENT_PORT);
+ exit(STATE_UNKNOWN);
+ }
+
+ return sock;
+}
+
+/* closes DHCP socket */
+int close_dhcp_socket(int sock)
+{
+
+ close(sock);
+
+ return OK;
+}
+
+/* adds a requested server address to list in memory */
+int add_requested_server(struct in_addr server_address)
+{
+ requested_server* new_server;
+
+ new_server = (requested_server*)malloc(sizeof(requested_server));
+ if (new_server == NULL)
+ return ERROR;
+
+ new_server->server_address = server_address;
+
+ new_server->next = requested_server_list;
+ requested_server_list = new_server;
+
+ requested_servers++;
+
+ if (verbose)
+ printf("Requested server address: %s\n", inet_ntoa(new_server->server_address));
+
+ return OK;
+}
+
+/* adds a DHCP OFFER to list in memory */
+int add_dhcp_offer(struct in_addr source, dhcp_packet* offer_packet)
+{
+ dhcp_offer* new_offer;
+ int x;
+ int y;
+ unsigned option_type;
+ unsigned option_length;
+
+ if (offer_packet == NULL)
+ return ERROR;
+
+ /* process all DHCP options present in the packet */
+ for (x = 4; x < MAX_DHCP_OPTIONS_LENGTH;) {
+
+ /* end of options (0 is really just a pad, but bail out anyway) */
+ if ((int)offer_packet->options[x] == -1 || (int)offer_packet->options[x] == 0)
+ break;
+
+ /* get option type */
+ option_type = offer_packet->options[x++];
+
+ /* get option length */
+ option_length = offer_packet->options[x++];
+
+ if (verbose)
+ printf("Option: %d (0x%02X)\n", option_type, option_length);
+
+ /* get option data */
+ if (option_type == DHCP_OPTION_LEASE_TIME) {
+ memcpy(&dhcp_lease_time, &offer_packet->options[x], sizeof(dhcp_lease_time));
+ dhcp_lease_time = ntohl(dhcp_lease_time);
+ }
+ if (option_type == DHCP_OPTION_RENEWAL_TIME) {
+ memcpy(&dhcp_renewal_time, &offer_packet->options[x], sizeof(dhcp_renewal_time));
+ dhcp_renewal_time = ntohl(dhcp_renewal_time);
+ }
+ if (option_type == DHCP_OPTION_REBINDING_TIME) {
+ memcpy(&dhcp_rebinding_time, &offer_packet->options[x], sizeof(dhcp_rebinding_time));
+ dhcp_rebinding_time = ntohl(dhcp_rebinding_time);
+ }
+
+ /* skip option data we're ignoring */
+ else
+ for (y = 0; y < option_length; y++, x++)
+ ;
+ }
+
+ if (verbose) {
+ if (dhcp_lease_time == DHCP_INFINITE_TIME)
+ printf("Lease Time: Infinite\n");
+ else
+ printf("Lease Time: %lu seconds\n", (unsigned long)dhcp_lease_time);
+ if (dhcp_renewal_time == DHCP_INFINITE_TIME)
+ printf("Renewal Time: Infinite\n");
+ else
+ printf("Renewal Time: %lu seconds\n", (unsigned long)dhcp_renewal_time);
+ if (dhcp_rebinding_time == DHCP_INFINITE_TIME)
+ printf("Rebinding Time: Infinite\n");
+ printf("Rebinding Time: %lu seconds\n", (unsigned long)dhcp_rebinding_time);
+ }
+
+ new_offer = (dhcp_offer*)malloc(sizeof(dhcp_offer));
+
+ if (new_offer == NULL)
+ return ERROR;
+
+ new_offer->server_address = source;
+ new_offer->offered_address = offer_packet->yiaddr;
+ new_offer->lease_time = dhcp_lease_time;
+ new_offer->renewal_time = dhcp_renewal_time;
+ new_offer->rebinding_time = dhcp_rebinding_time;
+
+ if (verbose) {
+ printf("Added offer from server @ %s", inet_ntoa(new_offer->server_address));
+ printf(" of IP address %s\n", inet_ntoa(new_offer->offered_address));
+ }
+
+ if (prometheus) {
+ printf("dhcpdiscover { server=\"%s\", address=\"%s\", dev=\"%s\" } 1\n", inet_ntoa(new_offer->server_address), inet_ntoa(new_offer->offered_address), network_interface_name);
+ }
+
+ /* add new offer to head of list */
+ new_offer->next = dhcp_offer_list;
+ dhcp_offer_list = new_offer;
+
+ return OK;
+}
+
+/* frees memory allocated to DHCP OFFER list */
+int free_dhcp_offer_list(void)
+{
+ dhcp_offer* this_offer;
+ dhcp_offer* next_offer;
+
+ for (this_offer = dhcp_offer_list; this_offer != NULL; this_offer = next_offer) {
+ next_offer = this_offer->next;
+ free(this_offer);
+ }
+
+ return OK;
+}
+
+/* frees memory allocated to requested server list */
+int free_requested_server_list(void)
+{
+ requested_server* this_server;
+ requested_server* next_server;
+
+ for (this_server = requested_server_list; this_server != NULL; this_server = next_server) {
+ next_server = this_server->next;
+ free(this_server);
+ }
+
+ return OK;
+}
+
+/* gets state and plugin output to return */
+int get_results(void)
+{
+ dhcp_offer* temp_offer;
+ requested_server* temp_server;
+ int result;
+ u_int32_t max_lease_time = 0;
+
+ received_requested_address = FALSE;
+
+ /* checks responses from requested servers */
+ requested_responses = 0;
+ if (requested_servers > 0) {
+
+ for (temp_server = requested_server_list; temp_server != NULL; temp_server = temp_server->next) {
+
+ for (temp_offer = dhcp_offer_list; temp_offer != NULL; temp_offer = temp_offer->next) {
+
+ /* get max lease time we were offered */
+ if (temp_offer->lease_time > max_lease_time || temp_offer->lease_time == DHCP_INFINITE_TIME)
+ max_lease_time = temp_offer->lease_time;
+
+ /* see if we got the address we requested */
+ if (!memcmp(&requested_address, &temp_offer->offered_address, sizeof(requested_address)))
+ received_requested_address = TRUE;
+
+ /* see if the servers we wanted a response from talked to us or not */
+ if (!memcmp(&temp_offer->server_address, &temp_server->server_address, sizeof(temp_server->server_address))) {
+ if (verbose) {
+ printf("DHCP Server Match: Offerer=%s", inet_ntoa(temp_offer->server_address));
+ printf(" Requested=%s\n", inet_ntoa(temp_server->server_address));
+ }
+ requested_responses++;
+ }
+ }
+ }
+
+ }
+
+ /* else check and see if we got our requested address from any server */
+ else {
+
+ for (temp_offer = dhcp_offer_list; temp_offer != NULL; temp_offer = temp_offer->next) {
+
+ /* get max lease time we were offered */
+ if (temp_offer->lease_time > max_lease_time || temp_offer->lease_time == DHCP_INFINITE_TIME)
+ max_lease_time = temp_offer->lease_time;
+
+ /* see if we got the address we requested */
+ if (!memcmp(&requested_address, &temp_offer->offered_address, sizeof(requested_address)))
+ received_requested_address = TRUE;
+ }
+ }
+
+ result = STATE_OK;
+ if (valid_responses == 0)
+ result = STATE_CRITICAL;
+ else if (requested_servers > 0 && requested_responses == 0)
+ result = STATE_CRITICAL;
+ else if (requested_responses < requested_servers)
+ result = STATE_WARNING;
+ else if (request_specific_address == TRUE && received_requested_address == FALSE)
+ result = STATE_WARNING;
+
+ printf("DHCP %s: ", (result == STATE_OK) ? "ok" : "problem");
+
+ /* we didn't receive any DHCPOFFERs */
+ if (dhcp_offer_list == NULL) {
+ printf("No DHCPOFFERs were received.\n");
+ return result;
+ }
+
+ printf("Received %d DHCPOFFER(s)", valid_responses);
+
+ if (requested_servers > 0)
+ printf(", %s%d of %d requested servers responded", ((requested_responses < requested_servers) && requested_responses > 0) ? "only " : "", requested_responses, requested_servers);
+
+ if (request_specific_address == TRUE)
+ printf(", requested address (%s) was %soffered", inet_ntoa(requested_address), (received_requested_address == TRUE) ? "" : "not ");
+
+ printf(", max lease time = ");
+ if (max_lease_time == DHCP_INFINITE_TIME)
+ printf("Infinity");
+ else
+ printf("%lu sec", (unsigned long)max_lease_time);
+
+ printf(".\n");
+
+ return result;
+}
+
+/* process command-line arguments */
+int process_arguments(int argc, char** argv)
+{
+ int c;
+
+ if (argc < 1)
+ return ERROR;
+
+ c = 0;
+ while ((c += (call_getopt(argc - c, &argv[c]))) < argc) {
+
+ /*
+ if(is_option(argv[c]))
+ continue;
+ */
+ }
+
+ return validate_arguments();
+}
+
+int call_getopt(int argc, char** argv)
+{
+ int c = 0;
+ int i = 0;
+ struct in_addr ipaddress;
+
+#ifdef HAVE_GETOPT_H
+ int option_index = 0;
+ int ret;
+ static struct option long_options[] = { { "serverip", required_argument, 0, 's' }, { "requestedip", required_argument, 0, 'r' }, { "timeout", required_argument, 0, 't' }, { "interface", required_argument, 0, 'i' }, { "mac", required_argument, 0, 'm' }, { "bannedip", required_argument, 0, 'b' }, { "verbose", no_argument, 0, 'v' }, { "prometheus", no_argument, 0, 'p' }, { "version", no_argument, 0, 'V' }, { "help", no_argument, 0, 'h' }, { 0, 0, 0, 0 } };
+#endif
+
+ while (1) {
+#ifdef HAVE_GETOPT_H
+ c = getopt_long(argc, argv, "+hVvpt:s:r:t:i:m:b:", long_options, &option_index);
+#else
+ c = getopt(argc, argv, "+?hVvpt:s:r:t:i:m:b:");
+#endif
+
+ i++;
+
+ if (c == -1 || c == EOF || c == 1)
+ break;
+
+ switch (c) {
+ case 'w':
+ case 'r':
+ case 't':
+ case 'i':
+ i++;
+ break;
+ default:
+ break;
+ }
+
+ switch (c) {
+
+ case 'm': /* Our MAC address */
+ {
+ ret = sscanf(optarg, "%x:%x:%x:%x:%x:%x", my_client_mac + 0, my_client_mac + 1, my_client_mac + 2, my_client_mac + 3, my_client_mac + 4, my_client_mac + 5);
+ if (ret != 6) {
+ usage("Invalid MAC address\n");
+ break;
+ }
+ for (i = 0; i < 6; ++i)
+ client_hardware_address[i] = my_client_mac[i];
+ }
+ mymac = 1;
+ break;
+ case 'b': /* Banned IP */
+ if (inet_aton(optarg, &ipaddress)) {
+ banned_ip = ipaddress;
+ banned = 1;
+ } else
+ printf("Banned IP not specified, ignoring -b");
+ break;
+
+ case 's': /* DHCP server address */
+ if (inet_aton(optarg, &ipaddress))
+ add_requested_server(ipaddress);
+ /*
+ else
+ usage("Invalid server IP address\n");
+ */
+ break;
+
+ case 'r': /* address we are requested from DHCP servers */
+ if (inet_aton(optarg, &ipaddress)) {
+ requested_address = ipaddress;
+ request_specific_address = TRUE;
+ }
+ /*
+ else
+ usage("Invalid requested IP address\n");
+ */
+ break;
+
+ case 't': /* timeout */
+
+ /*
+ if(is_intnonneg(optarg))
+ */
+ if (atoi(optarg) > 0)
+ dhcpoffer_timeout = atoi(optarg);
+ /*
+ else
+ usage("Time interval must be a nonnegative integer\n");
+ */
+ break;
+
+ case 'i': /* interface name */
+
+ strncpy(network_interface_name, optarg, sizeof(network_interface_name) - 1);
+ network_interface_name[sizeof(network_interface_name) - 1] = '\x0';
+
+ break;
+
+ case 'V': /* version */
+ print_revision(progname, revision);
+ exit(STATE_OK);
+
+ case 'h': /* help */
+ print_help();
+ exit(STATE_OK);
+
+ case 'v': /* verbose */
+ verbose = 1;
+ break;
+
+ case 'p': /* prometheus */
+ prometheus = 1;
+ break;
+
+ default: /* help */
+ printf("Unknown argument", optarg);
+ break;
+ }
+ }
+
+ return i;
+}
+
+int validate_arguments(void) { return OK; }
+
+#if defined(__sun__) || defined(__solaris__) || defined(__hpux__)
+
+/* Kompf 2000-2003 see ACKNOWLEDGEMENTS */
+
+/* get a message from a stream; return type of message */
+static int get_msg(int fd)
+{
+ int flags = 0;
+ int res, ret;
+ ctl_area[0] = 0;
+ dat_area[0] = 0;
+ ret = 0;
+ res = getmsg(fd, &ctl, &dat, &flags);
+
+ if (res < 0) {
+ if (errno == EINTR) {
+ return (GOT_INTR);
+ } else {
+ printf("%s\n", "get_msg FAILED.");
+ return (GOT_ERR);
+ }
+ }
+ if (ctl.len > 0) {
+ ret |= GOT_CTRL;
+ }
+ if (dat.len > 0) {
+ ret |= GOT_DATA;
+ }
+ return (ret);
+}
+
+/* verify that dl_primitive in ctl_area = prim */
+static int check_ctrl(int prim)
+{
+ dl_error_ack_t* err_ack = (dl_error_ack_t*)ctl_area;
+ if (err_ack->dl_primitive != prim) {
+ printf("Error: DLPI stream API failed to get MAC in check_ctrl: %s.\n", strerror(errno);
+ exit(STATE_UNKNOWN);
+ }
+ return 0;
+}
+
+/* put a control message on a stream */
+static int put_ctrl(int fd, int len, int pri)
+{
+ ctl.len = len;
+ if (putmsg(fd, &ctl, 0, pri) < 0) {
+ printf("Error: DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n", strerror(errno);
+ exit(STATE_UNKNOWN);
+ }
+ return 0;
+}
+
+/* put a control + data message on a stream */
+static int put_both(int fd, int clen, int dlen, int pri)
+{
+ ctl.len = clen;
+ dat.len = dlen;
+ if (putmsg(fd, &ctl, &dat, pri) < 0) {
+ printf("Error: DLPI stream API failed to get MAC in put_both/putmsg().\n", strerror(errno);
+ exit(STATE_UNKNOWN);
+ }
+ return 0;
+}
+
+/* open file descriptor and attach */
+static int dl_open(const char* dev, int unit, int* fd)
+{
+ dl_attach_req_t* attach_req = (dl_attach_req_t*)ctl_area;
+ if ((*fd = open(dev, O_RDWR)) == -1) {
+ printf("Error: DLPI stream API failed to get MAC in dl_attach_req/open(%s..): %s.\n", dev, strerror(errno);
+ exit(STATE_UNKNOWN);
+ }
+ attach_req->dl_primitive = DL_ATTACH_REQ;
+ attach_req->dl_ppa = unit;
+ put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
+ get_msg(*fd);
+ return check_ctrl(DL_OK_ACK);
+}
+
+/* send DL_BIND_REQ */
+static int dl_bind(int fd, int sap, u_char* addr)
+{
+ dl_bind_req_t* bind_req = (dl_bind_req_t*)ctl_area;
+ dl_bind_ack_t* bind_ack = (dl_bind_ack_t*)ctl_area;
+ bind_req->dl_primitive = DL_BIND_REQ;
+ bind_req->dl_sap = sap;
+ bind_req->dl_max_conind = 1;
+ bind_req->dl_service_mode = DL_CLDLS;
+ bind_req->dl_conn_mgmt = 0;
+ bind_req->dl_xidtest_flg = 0;
+ put_ctrl(fd, sizeof(dl_bind_req_t), 0);
+ get_msg(fd);
+ if (GOT_ERR == check_ctrl(DL_BIND_ACK)) {
+ printf("Error: DLPI stream API failed to get MAC in dl_bind/check_ctrl(): %s.\n", strerror(errno);
+ exit(STATE_UNKNOWN);
+ }
+ bcopy((u_char*)bind_ack + bind_ack->dl_addr_offset, addr, bind_ack->dl_addr_length);
+ return 0;
+}
+
+/***********************************************************************
+ * interface:
+ * function mac_addr_dlpi - get the mac address of the interface with
+ * type dev (eg lnc, hme) and unit (0, 1 ..)
+ *
+ * parameter: addr: an array of six bytes, has to be allocated by the caller
+ *
+ * return: 0 if OK, -1 if the address could not be determined
+ *
+ *
+ ***********************************************************************/
+
+long mac_addr_dlpi(const char* dev, int unit, u_char* addr)
+{
+
+ int fd;
+ u_char mac_addr[25];
+
+ if (GOT_ERR != dl_open(dev, unit, &fd)) {
+ if (GOT_ERR != dl_bind(fd, INSAP, mac_addr)) {
+ bcopy(mac_addr, addr, 6);
+ return 0;
+ }
+ }
+ close(fd);
+ return -1;
+}
+
+/* Kompf 2000-2003 */
+
+#endif
+
+/* print usage help */
+void print_help(void)
+{
+
+ print_revision(progname, revision);
+
+ printf(COPYRIGHT, copyright, email);
+
+ printf("\n\nThis program checks the existence and more details of a DHCP server\n\n");
+
+ print_usage();
+
+ printf("\
+ -s, --serverip=IPADDRESS\n\
+ IP address of DHCP server that we must hear from\n\
+ -r, --requestedip=IPADDRESS\n\
+ IP address that should be offered by at least one DHCP server\n\
+ -m, --mac=MACADDRESS\n\
+ Client MAC address to use for sending packets\n\
+ -b, --bannedip=IPADDRESS\n\
+ Server IP address to ignore\n\
+ -t, --timeout=INTEGER\n\
+ Seconds to wait for DHCPOFFER before timeout occurs\n\
+ -i, --interface=STRING\n\
+ Interface to to use for listening (i.e. eth0)\n\
+ -v, --verbose\n\
+ Print extra information (command-line use only)\n\
+ -p, --prometheus\n\
+ Print extra information in prometheus format\n\
+ -h, --help\n\
+ Print detailed help screen\n\
+ -V, --version\n\
+ Print version information\n\n\
+Example: sudo ./dhcpdiscover -i eth0 -b 192.168.1.1\n\
+");
+}
+
+void print_usage(void)
+{
+ printf("\
+Usage: %s [-s serverip] [-r requestedip] [-m clientmac ] [-b bannedip] [-t timeout] [-i interface]\n\
+ [-v] [-p]",
+ progname);
+}
projects / feed / packages.git / commitdiff