From 3cd9edb63947625619daae42da178bbdd9e9eece Mon Sep 17 00:00:00 2001 From: Ted Hess Date: Sat, 29 Dec 2018 12:43:53 -0500 Subject: [PATCH] Revert 28ce922bd202e3153edaabe0ab03b39e6ebfcb81 - pushed from wrong branch Signed-off-by: Ted Hess --- utils/dhcpdiscover/Makefile | 39 - utils/dhcpdiscover/README.md | 48 - utils/dhcpdiscover/src/Makefile | 13 - utils/dhcpdiscover/src/dhcpdiscover.c | 1325 ------------------------- 4 files changed, 1425 deletions(-) delete mode 100644 utils/dhcpdiscover/Makefile delete mode 100644 utils/dhcpdiscover/README.md delete mode 100644 utils/dhcpdiscover/src/Makefile delete mode 100644 utils/dhcpdiscover/src/dhcpdiscover.c diff --git a/utils/dhcpdiscover/Makefile b/utils/dhcpdiscover/Makefile deleted file mode 100644 index 81d9dfe65..000000000 --- a/utils/dhcpdiscover/Makefile +++ /dev/null @@ -1,39 +0,0 @@ -# -# Copyright (C) 2006-2013 OpenWrt.org -# -# This is free software, licensed under the GNU General Public License v2. -# See /LICENSE for more information. -# -# Author: p4u - -include $(TOPDIR)/rules.mk - -PKG_NAME:=dhcpdiscover -PKG_RELEASE:=1 - -PKG_BUILD_DIR:=$(BUILD_DIR)/dhcpdiscover - -include $(INCLUDE_DIR)/package.mk -include $(INCLUDE_DIR)/kernel.mk - -define Package/dhcpdiscover - SECTION:=net - CATEGORY:=Network - TITLE:=dhcpdiscover -endef - -define Package/dhcpdiscover/description - Brings some information about the existing DHCP servers of the network -endef - -define Build/Prepare - mkdir -p $(PKG_BUILD_DIR) - $(CP) ./src/* $(PKG_BUILD_DIR)/ -endef - -define Package/dhcpdiscover/install - $(INSTALL_DIR) $(1)/bin - $(INSTALL_BIN) $(PKG_BUILD_DIR)/dhcpdiscover $(1)/bin/ -endef - -$(eval $(call BuildPackage,dhcpdiscover)) diff --git a/utils/dhcpdiscover/README.md b/utils/dhcpdiscover/README.md deleted file mode 100644 index 1d14b6733..000000000 --- a/utils/dhcpdiscover/README.md +++ /dev/null @@ -1,48 +0,0 @@ -* Program: dhcpdiscover - - This program checks the existence and more details of a DHCP server - -* About the code structure - - The Makefile found in the directory of this README is for OpenWRT. It can be imported as a package. Inside the src/ directory the C code of dhcpdiscover can be found. If you want to compile it for your computer execute: cd src && make - -* Licence information - - Code under GPLv3 - - Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org), 2013 OpenWRT.org - -* Contributors - - Mike Gore 25 Aug 2005: Modified for standalone operation - Pau Escrich Jun 2013: Added -b option and ported to OpenWRT - - -___________________________________________________________ - - -``` -Usage: dhcpdiscover [-s serverip] [-r requestedip] [-m clientmac ] [-b bannedip] [-t timeout] [-i interface] - [-v] -s, --serverip=IPADDRESS - IP address of DHCP server that we must hear from - -r, --requestedip=IPADDRESS - IP address that should be offered by at least one DHCP server - -m, --mac=MACADDRESS - Client MAC address to use for sending packets - -b, --bannedip=IPADDRESS - Server IP address to ignore - -t, --timeout=INTEGER - Seconds to wait for DHCPOFFER before timeout occurs - -i, --interface=STRING - Interface to to use for listening (i.e. eth0) - -v, --verbose - Print extra information (command-line use only) - -p, --prometheus - Print extra information in prometheus format - -h, --help - Print detailed help screen - -V, --version - Print version information - -Example: sudo ./dhcpdiscover -i eth0 -b 192.168.1.1 -``` diff --git a/utils/dhcpdiscover/src/Makefile b/utils/dhcpdiscover/src/Makefile deleted file mode 100644 index 2dfbc7341..000000000 --- a/utils/dhcpdiscover/src/Makefile +++ /dev/null @@ -1,13 +0,0 @@ -CC = gcc -CPPFLAGS = -CFLAGS = -Os -Wall -LDFLAGS = -CONFIGURE_ARGS = - -all: dhcpdiscover - -dhcpdiscover: - $(CC) -o dhcpdiscover dhcpdiscover.c - -clean: - rm -f dhcpdiscover diff --git a/utils/dhcpdiscover/src/dhcpdiscover.c b/utils/dhcpdiscover/src/dhcpdiscover.c deleted file mode 100644 index 230f80746..000000000 --- a/utils/dhcpdiscover/src/dhcpdiscover.c +++ /dev/null @@ -1,1325 +0,0 @@ -/****************************************************************************** - * - * 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#if defined(__linux__) - -#include -#include - -#elif defined(__bsd__) - -#include -#include -#include - -#elif defined(__sun__) || defined(__solaris__) || defined(__hpux__) - -#define INSAP 22 -#define OUTSAP 24 - -#include -#include -#include -#include -#include - -#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); -}