Module: monitoring-plugins Branch: master Commit: 3934457c2a531b86d8dd7ceeebf4e0fbb7c83387 Author: RincewindsHat <[email protected]> Date: Tue Oct 15 16:00:07 2024 +0200 URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=3934457
check_dhcp: clang-format --- plugins-root/check_dhcp.c | 1149 +++++++++++++++++++++------------------------ 1 file changed, 548 insertions(+), 601 deletions(-) diff --git a/plugins-root/check_dhcp.c b/plugins-root/check_dhcp.c index 4b8f5e2..4f50a5c 100644 --- a/plugins-root/check_dhcp.c +++ b/plugins-root/check_dhcp.c @@ -59,45 +59,45 @@ const char *email = "[email protected]"; #include <arpa/inet.h> #if HAVE_SYS_SOCKIO_H -#include <sys/sockio.h> +# include <sys/sockio.h> #endif // HAVE_SYS_SOCKIO_H -#if defined( __linux__ ) +#if defined(__linux__) -#include <linux/if_ether.h> -#include <features.h> +# include <linux/if_ether.h> +# include <features.h> -#elif defined (__bsd__) +#elif defined(__bsd__) -#include <netinet/if_ether.h> -#include <sys/param.h> -#include <sys/sysctl.h> -#include <net/if_dl.h> +# include <netinet/if_ether.h> +# include <sys/param.h> +# include <sys/sysctl.h> +# include <net/if_dl.h> #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__) -#define INSAP 22 -#define OUTSAP 24 +# define INSAP 22 +# define OUTSAP 24 -#include <signal.h> -#include <ctype.h> -#include <sys/stropts.h> -#include <sys/poll.h> -#include <sys/dlpi.h> +# include <signal.h> +# include <ctype.h> +# include <sys/stropts.h> +# include <sys/poll.h> +# include <sys/dlpi.h> -#define bcopy(source, destination, length) memcpy(destination, source, length) +# define bcopy(source, destination, length) memcpy(destination, source, length) -#define AREA_SZ 5000 /* buffer length in bytes */ +# 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 GOT_CTRL 1 +# define GOT_DATA 2 +# define GOT_BOTH 3 +# define GOT_INTR 4 +# define GOT_ERR 128 static int get_msg(int); static int check_ctrl(int); @@ -105,178 +105,168 @@ 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 *); +long mac_addr_dlpi(const char *, int, u_char *); #endif // __sun__ || __solaris__ || __hpux - - /**** Common definitions ****/ -#define OK 0 -#define ERROR -1 - +#define OK 0 +#define ERROR -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{ - uint8_t op; /* packet type */ - uint8_t htype; /* type of hardware address for this machine (Ethernet, etc) */ - uint8_t hlen; /* length of hardware address (of this machine) */ - uint8_t hops; /* hops */ - uint32_t xid; /* random transaction id number - chosen by this machine */ - uint16_t secs; /* seconds used in timing */ - uint16_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 next 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 */ +#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 { + uint8_t op; /* packet type */ + uint8_t htype; /* type of hardware address for this machine (Ethernet, etc) */ + uint8_t hlen; /* length of hardware address (of this machine) */ + uint8_t hops; /* hops */ + uint32_t xid; /* random transaction id number - chosen by this machine */ + uint16_t secs; /* seconds used in timing */ + uint16_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 next 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 */ uint32_t lease_time; /* lease time in seconds */ uint32_t renewal_time; /* renewal time in seconds */ uint32_t rebinding_time; /* rebinding time in seconds */ - bool desired; /* is this offer desired (necessary in exclusive mode) */ + bool desired; /* is this offer desired (necessary in exclusive mode) */ struct dhcp_offer_struct *next; -}dhcp_offer; - +} dhcp_offer; -typedef struct requested_server_struct{ +typedef struct requested_server_struct { struct in_addr server_address; bool answered; 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_SERVER_IDENTIFIER 54 -#define DHCP_OPTION_RENEWAL_TIME 58 -#define DHCP_OPTION_REBINDING_TIME 59 -#define DHCP_OPTION_END 255 - -#define DHCP_INFINITE_TIME 0xFFFFFFFF +} 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_SERVER_IDENTIFIER 54 +#define DHCP_OPTION_RENEWAL_TIME 58 +#define DHCP_OPTION_REBINDING_TIME 59 +#define DHCP_OPTION_END 255 + +#define DHCP_INFINITE_TIME 0xFFFFFFFF #define DHCP_BROADCAST_FLAG 32768 -#define DHCP_SERVER_PORT 67 -#define DHCP_CLIENT_PORT 68 +#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 */ +#define ETHERNET_HARDWARE_ADDRESS 1 /* used in htype field of dhcp packet */ +#define ETHERNET_HARDWARE_ADDRESS_LENGTH 6 /* length of Ethernet hardware addresses */ -bool unicast = false; /* unicast mode: mimic a DHCP relay */ -bool exclusive = false; /* exclusive mode aka "rogue DHCP server detection" */ -struct in_addr my_ip; /* our address (required for relay) */ -struct in_addr dhcp_ip; /* server to query (if in unicast mode) */ -unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH]=""; -unsigned char *user_specified_mac=NULL; +bool unicast = false; /* unicast mode: mimic a DHCP relay */ +bool exclusive = false; /* exclusive mode aka "rogue DHCP server detection" */ +struct in_addr my_ip; /* our address (required for relay) */ +struct in_addr dhcp_ip; /* server to query (if in unicast mode) */ +unsigned char client_hardware_address[MAX_DHCP_CHADDR_LENGTH] = ""; +unsigned char *user_specified_mac = NULL; -char network_interface_name[IFNAMSIZ]="eth0"; +char network_interface_name[IFNAMSIZ] = "eth0"; -uint32_t packet_xid=0; +uint32_t packet_xid = 0; -uint32_t dhcp_lease_time=0; -uint32_t dhcp_renewal_time=0; -uint32_t dhcp_rebinding_time=0; +uint32_t dhcp_lease_time = 0; +uint32_t dhcp_renewal_time = 0; +uint32_t dhcp_rebinding_time = 0; -int dhcpoffer_timeout=2; +int dhcpoffer_timeout = 2; -dhcp_offer *dhcp_offer_list=NULL; -requested_server *requested_server_list=NULL; +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 valid_responses = 0; /* number of valid DHCPOFFERs we received */ +int requested_servers = 0; +int requested_responses = 0; -bool request_specific_address=false; -bool received_requested_address=false; -int verbose=0; +bool request_specific_address = false; +bool received_requested_address = false; +int verbose = 0; struct in_addr requested_address; - int process_arguments(int, char **); int call_getopt(int, char **); int validate_arguments(int); void print_usage(void); void print_help(void); -void resolve_host(const char *in,struct in_addr *out); +void resolve_host(const char *in, struct in_addr *out); unsigned char *mac_aton(const char *); void print_hardware_address(const unsigned char *); -int get_hardware_address(int,char *); -int get_ip_address(int,char *); +int get_hardware_address(int, char *); +int get_ip_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 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 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 main(int argc, char **argv) { int dhcp_socket; int result = STATE_UNKNOWN; - setlocale (LC_ALL, ""); - bindtextdomain (PACKAGE, LOCALEDIR); - textdomain (PACKAGE); + setlocale(LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); /* Parse extra opts if any */ - argv=np_extra_opts(&argc, argv, progname); + argv = np_extra_opts(&argc, argv, progname); - if(process_arguments(argc,argv)!=OK){ - usage4 (_("Could not parse arguments")); + if (process_arguments(argc, argv) != OK) { + usage4(_("Could not parse arguments")); } /* create socket for DHCP communications */ - dhcp_socket=create_dhcp_socket(); + dhcp_socket = create_dhcp_socket(); /* get hardware address of client machine */ - if(user_specified_mac!=NULL) - memcpy(client_hardware_address,user_specified_mac,6); + if (user_specified_mac != NULL) + memcpy(client_hardware_address, user_specified_mac, 6); else - get_hardware_address(dhcp_socket,network_interface_name); + get_hardware_address(dhcp_socket, network_interface_name); - if(unicast) /* get IP address of client machine */ - get_ip_address(dhcp_socket,network_interface_name); + if (unicast) /* get IP address of client machine */ + get_ip_address(dhcp_socket, network_interface_name); /* send DHCPDISCOVER packet */ send_dhcp_discover(dhcp_socket); @@ -288,7 +278,7 @@ int main(int argc, char **argv){ close_dhcp_socket(dhcp_socket); /* determine state/plugin output to return */ - result=get_results(); + result = get_results(); /* free allocated memory */ free_dhcp_offer_list(); @@ -297,34 +287,32 @@ int main(int argc, char **argv){ return result; } - - /* determines hardware address on client machine */ -int get_hardware_address(int sock,char *interface_name){ +int get_hardware_address(int sock, char *interface_name) { #if defined(__linux__) struct ifreq ifr; - strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1); - ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0'; + strncpy((char *)&ifr.ifr_name, interface_name, sizeof(ifr.ifr_name) - 1); + ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0'; /* 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); + 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); + memcpy(&client_hardware_address[0], &ifr.ifr_hwaddr.sa_data, 6); #elif defined(__bsd__) /* King 2004 see ACKNOWLEDGEMENTS */ - size_t len; - int mib[6]; - char *buf; - unsigned char *ptr; - struct if_msghdr *ifm; - struct sockaddr_dl *sdl; + size_t len; + int mib[6]; + char *buf; + unsigned char *ptr; + struct if_msghdr *ifm; + struct sockaddr_dl *sdl; mib[0] = CTL_NET; mib[1] = AF_ROUTE; @@ -332,22 +320,22 @@ int get_hardware_address(int sock,char *interface_name){ mib[3] = AF_LINK; mib[4] = NET_RT_IFLIST; - if((mib[5] = if_nametoindex(interface_name)) == 0){ + 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){ + 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){ + 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){ + 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); } @@ -355,7 +343,7 @@ int get_hardware_address(int sock,char *interface_name){ ifm = (struct if_msghdr *)buf; sdl = (struct sockaddr_dl *)(ifm + 1); ptr = (unsigned char *)LLADDR(sdl); - memcpy(&client_hardware_address[0], ptr, 6) ; + memcpy(&client_hardware_address[0], ptr, 6); /* King 2004 */ #elif defined(__sun__) || defined(__solaris__) @@ -368,22 +356,21 @@ int get_hardware_address(int sock,char *interface_name){ /* get last number from interfacename, eg lnc0, e1000g0*/ int i; - p = interface_name + strlen(interface_name) -1; - for(i = strlen(interface_name) -1; i > 0; p--) { - if(isalpha(*p)) + p = interface_name + strlen(interface_name) - 1; + for (i = strlen(interface_name) - 1; i > 0; p--) { + if (isalpha(*p)) break; } p++; - if( p != interface_name ){ - unit = atoi(p) ; - strncat(dev, interface_name, 6) ; - } - else{ + if (p != interface_name) { + unit = atoi(p); + 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){ + 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); } @@ -391,11 +378,11 @@ int get_hardware_address(int sock,char *interface_name){ #elif defined(__hpux__) long stat; - char dev[20] = "/dev/dlpi" ; + char dev[20] = "/dev/dlpi"; int unit = 0; stat = mac_addr_dlpi(dev, unit, client_hardware_address); - if(stat != 0){ + 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); } @@ -406,68 +393,65 @@ int get_hardware_address(int sock,char *interface_name){ exit(STATE_UNKNOWN); #endif - if(verbose) + if (verbose) print_hardware_address(client_hardware_address); return OK; } /* determines IP address of the client interface */ -int get_ip_address(int sock,char *interface_name){ +int get_ip_address(int sock, char *interface_name) { #if defined(SIOCGIFADDR) struct ifreq ifr; - strncpy((char *)&ifr.ifr_name,interface_name,sizeof(ifr.ifr_name)-1); - ifr.ifr_name[sizeof(ifr.ifr_name)-1]='\0'; + strncpy((char *)&ifr.ifr_name, interface_name, sizeof(ifr.ifr_name) - 1); + ifr.ifr_name[sizeof(ifr.ifr_name) - 1] = '\0'; - if(ioctl(sock,SIOCGIFADDR,&ifr)<0){ - printf(_("Error: Cannot determine IP address of interface %s\n"), - interface_name); + if (ioctl(sock, SIOCGIFADDR, &ifr) < 0) { + printf(_("Error: Cannot determine IP address of interface %s\n"), interface_name); exit(STATE_UNKNOWN); } - my_ip=((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr; + my_ip = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr; #else printf(_("Error: Cannot get interface IP address on this platform.\n")); exit(STATE_UNKNOWN); #endif - if(verbose) - printf(_("Pretending to be relay client %s\n"),inet_ntoa(my_ip)); + if (verbose) + printf(_("Pretending to be relay client %s\n"), inet_ntoa(my_ip)); return OK; } /* sends a DHCPDISCOVER broadcast message in an attempt to find DHCP servers */ -int send_dhcp_discover(int sock){ +int send_dhcp_discover(int sock) { dhcp_packet discover_packet; struct sockaddr_in sockaddr_broadcast; unsigned short opts; - /* clear the packet data structure */ - bzero(&discover_packet,sizeof(discover_packet)); - + bzero(&discover_packet, sizeof(discover_packet)); /* boot request flag (backward compatible with BOOTP servers) */ - discover_packet.op=BOOTREQUEST; + discover_packet.op = BOOTREQUEST; /* hardware address type */ - discover_packet.htype=ETHERNET_HARDWARE_ADDRESS; + discover_packet.htype = ETHERNET_HARDWARE_ADDRESS; /* length of our hardware address */ - discover_packet.hlen=ETHERNET_HARDWARE_ADDRESS_LENGTH; + discover_packet.hlen = ETHERNET_HARDWARE_ADDRESS_LENGTH; /* * transaction ID is supposed to be random. */ - srand(time(NULL)^getpid()); - packet_xid=random(); - discover_packet.xid=htonl(packet_xid); + srand(time(NULL) ^ getpid()); + packet_xid = random(); + discover_packet.xid = htonl(packet_xid); /*discover_packet.secs=htons(65535);*/ - discover_packet.secs=0xFF; + discover_packet.secs = 0xFF; /* * server needs to know if it should broadcast or unicast its response: @@ -476,71 +460,67 @@ int send_dhcp_discover(int sock){ discover_packet.flags = unicast ? 0 : htons(DHCP_BROADCAST_FLAG); /* our hardware address */ - memcpy(discover_packet.chaddr,client_hardware_address,ETHERNET_HARDWARE_ADDRESS_LENGTH); + 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'; + discover_packet.options[0] = '\x63'; + discover_packet.options[1] = '\x82'; + discover_packet.options[2] = '\x53'; + discover_packet.options[3] = '\x63'; opts = 4; /* DHCP message type is embedded in options field */ - discover_packet.options[opts++]=DHCP_OPTION_MESSAGE_TYPE; /* DHCP message type option identifier */ - discover_packet.options[opts++]='\x01'; /* DHCP message option length in bytes */ - discover_packet.options[opts++]=DHCPDISCOVER; + discover_packet.options[opts++] = DHCP_OPTION_MESSAGE_TYPE; /* DHCP message type option identifier */ + discover_packet.options[opts++] = '\x01'; /* DHCP message option length in bytes */ + discover_packet.options[opts++] = DHCPDISCOVER; /* the IP address we're requesting */ - if(request_specific_address){ - discover_packet.options[opts++]=DHCP_OPTION_REQUESTED_ADDRESS; - discover_packet.options[opts++]='\x04'; - memcpy(&discover_packet.options[opts],&requested_address,sizeof(requested_address)); + if (request_specific_address) { + discover_packet.options[opts++] = DHCP_OPTION_REQUESTED_ADDRESS; + discover_packet.options[opts++] = '\x04'; + memcpy(&discover_packet.options[opts], &requested_address, sizeof(requested_address)); opts += sizeof(requested_address); } - discover_packet.options[opts++]= (char)DHCP_OPTION_END; + discover_packet.options[opts++] = (char)DHCP_OPTION_END; /* unicast fields */ - if(unicast) + if (unicast) discover_packet.giaddr.s_addr = my_ip.s_addr; /* see RFC 1542, 4.1.1 */ discover_packet.hops = unicast ? 1 : 0; /* send the DHCPDISCOVER packet to broadcast address */ - sockaddr_broadcast.sin_family=AF_INET; - sockaddr_broadcast.sin_port=htons(DHCP_SERVER_PORT); + sockaddr_broadcast.sin_family = AF_INET; + sockaddr_broadcast.sin_port = htons(DHCP_SERVER_PORT); sockaddr_broadcast.sin_addr.s_addr = unicast ? dhcp_ip.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: %u (0x%X)\n",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)); + 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: %u (0x%X)\n", 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); + send_dhcp_packet(&discover_packet, sizeof(discover_packet), sock, &sockaddr_broadcast); - if(verbose) + if (verbose) printf("\n\n"); return OK; } - - - /* waits for a DHCPOFFER message from one or more DHCP servers */ -int get_dhcp_offer(int sock){ +int get_dhcp_offer(int sock) { dhcp_packet offer_packet; struct sockaddr_in source; struct sockaddr_in via; - int result=OK; - int responses=0; + int result = OK; + int responses = 0; int x; time_t start_time; time_t current_time; @@ -548,30 +528,29 @@ int get_dhcp_offer(int sock){ time(&start_time); /* receive as many responses as we can */ - for(responses=0,valid_responses=0;;){ + for (responses = 0, valid_responses = 0;;) { time(¤t_time); - if((current_time-start_time)>=dhcpoffer_timeout) + if ((current_time - start_time) >= dhcpoffer_timeout) break; - if(verbose) + if (verbose) printf("\n\n"); - bzero(&source,sizeof(source)); - bzero(&via,sizeof(via)); - bzero(&offer_packet,sizeof(offer_packet)); + bzero(&source, sizeof(source)); + bzero(&via, sizeof(via)); + bzero(&offer_packet, sizeof(offer_packet)); - result=OK; - result=receive_dhcp_packet(&offer_packet,sizeof(offer_packet),sock,dhcpoffer_timeout,&source); + result = OK; + result = receive_dhcp_packet(&offer_packet, sizeof(offer_packet), sock, dhcpoffer_timeout, &source); - if(result!=OK){ - if(verbose) + if (result != OK) { + if (verbose) printf(_("Result=ERROR\n")); continue; - } - else{ - if(verbose) + } else { + if (verbose) printf(_("Result=OK\n")); responses++; @@ -579,85 +558,81 @@ int get_dhcp_offer(int sock){ /* The "source" is either a server or a relay. */ /* Save a copy of "source" into "via" even if it's via itself */ - memcpy(&via,&source,sizeof(source)) ; + memcpy(&via, &source, sizeof(source)); - if(verbose){ - printf(_("DHCPOFFER from IP address %s"),inet_ntoa(source.sin_addr)); - printf(_(" via %s\n"),inet_ntoa(via.sin_addr)); - printf("DHCPOFFER XID: %u (0x%X)\n",ntohl(offer_packet.xid),ntohl(offer_packet.xid)); + if (verbose) { + printf(_("DHCPOFFER from IP address %s"), inet_ntoa(source.sin_addr)); + printf(_(" via %s\n"), inet_ntoa(via.sin_addr)); + printf("DHCPOFFER XID: %u (0x%X)\n", 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 (%u) did not match DHCPDISCOVER XID (%u) - ignoring packet\n"),ntohl(offer_packet.xid),packet_xid); + if (ntohl(offer_packet.xid) != packet_xid) { + if (verbose) + printf(_("DHCPOFFER XID (%u) did not match DHCPDISCOVER XID (%u) - ignoring packet\n"), ntohl(offer_packet.xid), packet_xid); continue; } /* check hardware address */ - result=OK; - if(verbose) + 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]); + 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 (offer_packet.chaddr[x] != client_hardware_address[x]) + result = ERROR; } - if(verbose) + if (verbose) printf("\n"); - if(result==ERROR){ - if(verbose) + 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)); + 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); + 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); + 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){ +int send_dhcp_packet(void *buffer, int buffer_size, int sock, struct sockaddr_in *dest) { int result; - result=sendto(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)dest,sizeof(*dest)); + result = sendto(sock, (char *)buffer, buffer_size, 0, (struct sockaddr *)dest, sizeof(*dest)); - if(verbose) - printf(_("send_dhcp_packet result: %d\n"),result); + if (verbose) + printf(_("send_dhcp_packet result: %d\n"), result); - if(result<0) + 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){ +int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, struct sockaddr_in *address) { struct timeval tv; fd_set readfds; fd_set oobfds; @@ -666,44 +641,42 @@ int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, st struct sockaddr_in source_address; int nfound; - /* wait for data to arrive (up time timeout) */ - tv.tv_sec=timeout; - tv.tv_usec=0; + tv.tv_sec = timeout; + tv.tv_usec = 0; FD_ZERO(&readfds); FD_ZERO(&oobfds); - FD_SET(sock,&readfds); - FD_SET(sock,&oobfds); - nfound = select(sock+1,&readfds,NULL,&oobfds,&tv); + FD_SET(sock, &readfds); + FD_SET(sock, &oobfds); + nfound = select(sock + 1, &readfds, NULL, &oobfds, &tv); /* make sure some data has arrived */ - if(!FD_ISSET(sock,&readfds)){ - if(verbose) + if (!FD_ISSET(sock, &readfds)) { + if (verbose) printf(_("No (more) data received (nfound: %d)\n"), nfound); return ERROR; } - else{ - bzero(&source_address,sizeof(source_address)); - address_size=sizeof(source_address); - recv_result=recvfrom(sock,(char *)buffer,buffer_size,0,(struct sockaddr *)&source_address,&address_size); - if(verbose) - printf("recv_result: %d\n",recv_result); + else { + bzero(&source_address, sizeof(source_address)); + address_size = sizeof(source_address); + recv_result = recvfrom(sock, (char *)buffer, buffer_size, 0, (struct sockaddr *)&source_address, &address_size); + if (verbose) + printf("recv_result: %d\n", recv_result); - if(recv_result==-1){ - if(verbose){ + if (recv_result == -1) { + if (verbose) { printf(_("recvfrom() failed, ")); - printf("errno: (%d) -> %s\n",errno,strerror(errno)); + 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)); + } 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)); + memcpy(address, &source_address, sizeof(source_address)); return OK; } } @@ -711,172 +684,166 @@ int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, st return OK; } - /* creates a socket for DHCP communication */ -int create_dhcp_socket(void){ +int create_dhcp_socket(void) { struct sockaddr_in myname; struct ifreq interface; int sock; - int flag=1; + int flag = 1; /* Set up the address we're going to bind to. */ - bzero(&myname,sizeof(myname)); - myname.sin_family=AF_INET; + bzero(&myname, sizeof(myname)); + myname.sin_family = AF_INET; /* listen to DHCP server port if we're in unicast mode */ myname.sin_port = htons(unicast ? DHCP_SERVER_PORT : DHCP_CLIENT_PORT); myname.sin_addr.s_addr = unicast ? my_ip.s_addr : INADDR_ANY; - bzero(&myname.sin_zero,sizeof(myname.sin_zero)); + 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){ + 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); + 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){ + 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(!unicast && setsockopt(sock,SOL_SOCKET,SO_BROADCAST,(char *)&flag,sizeof flag)<0){ + if (!unicast && 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-1); - interface.ifr_ifrn.ifrn_name[IFNAMSIZ-1]='\0'; - 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); + strncpy(interface.ifr_ifrn.ifrn_name, network_interface_name, IFNAMSIZ - 1); + interface.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = '\0'; + 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-1); - interface.ifr_name[IFNAMSIZ-1]='\0'; + strncpy(interface.ifr_name, network_interface_name, IFNAMSIZ - 1); + interface.ifr_name[IFNAMSIZ - 1] = '\0'; #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); + 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){ +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){ +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) + new_server = (requested_server *)malloc(sizeof(requested_server)); + if (new_server == NULL) return ERROR; - new_server->server_address=server_address; - new_server->answered=false; + new_server->server_address = server_address; + new_server->answered = false; - new_server->next=requested_server_list; - requested_server_list=new_server; + 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)); + 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){ +int add_dhcp_offer(struct in_addr source, dhcp_packet *offer_packet) { dhcp_offer *new_offer; int x; unsigned option_type; unsigned option_length; struct in_addr serv_ident = {0}; - if(offer_packet==NULL) + if (offer_packet == NULL) return ERROR; /* process all DHCP options present in the packet */ - for(x=4;x<MAX_DHCP_OPTIONS_LENGTH-1;){ + for (x = 4; x < MAX_DHCP_OPTIONS_LENGTH - 1;) { - if((int)offer_packet->options[x]==-1) + if ((int)offer_packet->options[x] == -1) break; /* get option type */ - option_type=offer_packet->options[x++]; + option_type = offer_packet->options[x++]; /* get option length */ - option_length=offer_packet->options[x++]; + option_length = offer_packet->options[x++]; - if(verbose) - printf("Option: %d (0x%02X)\n",option_type,option_length); + if (verbose) + printf("Option: %d (0x%02X)\n", option_type, option_length); /* get option data */ - switch(option_type){ - case DHCP_OPTION_LEASE_TIME: - memcpy(&dhcp_lease_time, &offer_packet->options[x],sizeof(dhcp_lease_time)); - dhcp_lease_time = ntohl(dhcp_lease_time); - break; - case DHCP_OPTION_RENEWAL_TIME: - memcpy(&dhcp_renewal_time, &offer_packet->options[x],sizeof(dhcp_renewal_time)); - dhcp_renewal_time = ntohl(dhcp_renewal_time); - break; - case DHCP_OPTION_REBINDING_TIME: - memcpy(&dhcp_rebinding_time, &offer_packet->options[x],sizeof(dhcp_rebinding_time)); - dhcp_rebinding_time = ntohl(dhcp_rebinding_time); - break; - case DHCP_OPTION_SERVER_IDENTIFIER: - memcpy(&serv_ident.s_addr, &offer_packet->options[x],sizeof(serv_ident.s_addr)); - break; + switch (option_type) { + case DHCP_OPTION_LEASE_TIME: + memcpy(&dhcp_lease_time, &offer_packet->options[x], sizeof(dhcp_lease_time)); + dhcp_lease_time = ntohl(dhcp_lease_time); + break; + case DHCP_OPTION_RENEWAL_TIME: + memcpy(&dhcp_renewal_time, &offer_packet->options[x], sizeof(dhcp_renewal_time)); + dhcp_renewal_time = ntohl(dhcp_renewal_time); + break; + case DHCP_OPTION_REBINDING_TIME: + memcpy(&dhcp_rebinding_time, &offer_packet->options[x], sizeof(dhcp_rebinding_time)); + dhcp_rebinding_time = ntohl(dhcp_rebinding_time); + break; + case DHCP_OPTION_SERVER_IDENTIFIER: + memcpy(&serv_ident.s_addr, &offer_packet->options[x], sizeof(serv_ident.s_addr)); + break; } /* skip option data we're ignoring */ - if(option_type==0) /* "pad" option, see RFC 2132 (3.1) */ - x+=1; + if (option_type == 0) /* "pad" option, see RFC 2132 (3.1) */ + x += 1; else - x+=option_length; + x += option_length; } - if(verbose){ - if(dhcp_lease_time==DHCP_INFINITE_TIME) + 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(_("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(_("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); + printf(_("Rebinding Time: %lu seconds\n"), (unsigned long)dhcp_rebinding_time); } - new_offer=(dhcp_offer *)malloc(sizeof(dhcp_offer)); + new_offer = (dhcp_offer *)malloc(sizeof(dhcp_offer)); - if(new_offer==NULL) + if (new_offer == NULL) return ERROR; /* @@ -891,298 +858,286 @@ int add_dhcp_offer(struct in_addr source,dhcp_packet *offer_packet){ * DHCPOFFER from. If 'serv_ident' isn't available for some reason, we * use 'source'. */ - new_offer->server_address=serv_ident.s_addr?serv_ident: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; - new_offer->desired=false; /* exclusive mode: we'll check that in get_results */ - - - 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)); + new_offer->server_address = serv_ident.s_addr ? serv_ident : 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; + new_offer->desired = false; /* exclusive mode: we'll check that in get_results */ + + 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)); } /* add new offer to head of list */ - new_offer->next=dhcp_offer_list; - dhcp_offer_list=new_offer; + 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){ +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; + 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){ +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; + 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, *undesired_offer=NULL; +int get_results(void) { + dhcp_offer *temp_offer, *undesired_offer = NULL; requested_server *temp_server; int result; - uint32_t max_lease_time=0; + uint32_t max_lease_time = 0; - received_requested_address=false; + received_requested_address = false; /* checks responses from requested servers */ - requested_responses=0; - if(requested_servers>0){ + requested_responses = 0; + if (requested_servers > 0) { - for(temp_server=requested_server_list;temp_server!=NULL;temp_server=temp_server->next){ + 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){ + 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; + 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; + 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"),inet_ntoa(temp_server->server_address)); - if(temp_server->answered) + 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"), inet_ntoa(temp_server->server_address)); + if (temp_server->answered) printf(_(" (duplicate)")); printf(_("\n")); } - if(!temp_server->answered){ + if (!temp_server->answered) { requested_responses++; - temp_server->answered=true; - temp_offer->desired=true; + temp_server->answered = true; + temp_offer->desired = true; } } } } /* exclusive mode: check for undesired offers */ - for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->next) { + for (temp_offer = dhcp_offer_list; temp_offer != NULL; temp_offer = temp_offer->next) { if (!temp_offer->desired) { - undesired_offer=temp_offer; /* Checks only for the first undesired offer */ - break; /* no further checks needed */ + undesired_offer = temp_offer; /* Checks only for the first undesired offer */ + break; /* no further checks needed */ } } } /* else check and see if we got our requested address from any server */ - else{ + else { - for(temp_offer=dhcp_offer_list;temp_offer!=NULL;temp_offer=temp_offer->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; + 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; + 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 && !received_requested_address) - result=STATE_WARNING; + 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 && !received_requested_address) + result = STATE_WARNING; - if(exclusive && undesired_offer) - result=STATE_CRITICAL; + if (exclusive && undesired_offer) + result = STATE_CRITICAL; - if(result==0) /* garrett honeycutt 2005 */ + if (result == 0) /* garrett honeycutt 2005 */ printf("OK: "); - else if(result==1) + else if (result == 1) printf("WARNING: "); - else if(result==2) + else if (result == 2) printf("CRITICAL: "); - else if(result==3) + else if (result == 3) printf("UNKNOWN: "); /* we didn't receive any DHCPOFFERs */ - if(dhcp_offer_list==NULL){ + if (dhcp_offer_list == NULL) { printf(_("No DHCPOFFERs were received.\n")); return result; } - printf(_("Received %d DHCPOFFER(s)"),valid_responses); - + printf(_("Received %d DHCPOFFER(s)"), valid_responses); - if(exclusive && undesired_offer){ - printf(_(", Rogue DHCP Server detected! Server %s"),inet_ntoa(undesired_offer->server_address)); - printf(_(" offered %s \n"),inet_ntoa(undesired_offer->offered_address)); + if (exclusive && undesired_offer) { + printf(_(", Rogue DHCP Server detected! Server %s"), inet_ntoa(undesired_offer->server_address)); + printf(_(" offered %s \n"), inet_ntoa(undesired_offer->offered_address)); return result; } - 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 (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) - printf(_(", requested address (%s) was %soffered"),inet_ntoa(requested_address),(received_requested_address)?"":_("not ")); + if (request_specific_address) + printf(_(", requested address (%s) was %soffered"), inet_ntoa(requested_address), (received_requested_address) ? "" : _("not ")); printf(_(", max lease time = ")); - if(max_lease_time==DHCP_INFINITE_TIME) + if (max_lease_time == DHCP_INFINITE_TIME) printf(_("Infinity")); else - printf("%lu sec",(unsigned long)max_lease_time); + printf("%lu sec", (unsigned long)max_lease_time); printf(".\n"); return result; } - /* process command-line arguments */ -int process_arguments(int argc, char **argv){ - if(argc<1) +int process_arguments(int argc, char **argv) { + if (argc < 1) return ERROR; - call_getopt(argc,argv); + call_getopt(argc, argv); return validate_arguments(argc); } - - -int call_getopt(int argc, char **argv){ +int call_getopt(int argc, char **argv) { extern int optind; int option_index = 0; - 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'}, - {"unicast", no_argument, 0,'u'}, - {"exclusive", no_argument, 0,'x'}, - {"verbose", no_argument, 0,'v'}, - {"version", no_argument, 0,'V'}, - {"help", no_argument, 0,'h'}, - {0,0,0,0} - }; - - int c=0; - while(true){ - c=getopt_long(argc,argv,"+hVvxt:s:r:t:i:m:u",long_options,&option_index); - - if(c==-1||c==EOF||c==1) + 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'}, + {"unicast", no_argument, 0, 'u'}, + {"exclusive", no_argument, 0, 'x'}, + {"verbose", no_argument, 0, 'v'}, + {"version", no_argument, 0, 'V'}, + {"help", no_argument, 0, 'h'}, + {0, 0, 0, 0}}; + + int c = 0; + while (true) { + c = getopt_long(argc, argv, "+hVvxt:s:r:t:i:m:u", long_options, &option_index); + + if (c == -1 || c == EOF || c == 1) break; - switch(c){ - - case 's': /* DHCP server address */ - resolve_host(optarg,&dhcp_ip); - add_requested_server(dhcp_ip); - break; + switch (c) { - case 'r': /* address we are requested from DHCP servers */ - resolve_host(optarg,&requested_address); - request_specific_address=true; - break; + case 's': /* DHCP server address */ + resolve_host(optarg, &dhcp_ip); + add_requested_server(dhcp_ip); + break; - case 't': /* timeout */ + case 'r': /* address we are requested from DHCP servers */ + resolve_host(optarg, &requested_address); + request_specific_address = true; + break; - /* - if(is_intnonneg(optarg)) - */ - if(atoi(optarg)>0) - dhcpoffer_timeout=atoi(optarg); - /* - else - usage("Time interval must be a nonnegative integer\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 'm': /* MAC address */ + case 'm': /* MAC address */ - if((user_specified_mac=mac_aton(optarg)) == NULL) - usage("Cannot parse MAC address.\n"); - if(verbose) - print_hardware_address(user_specified_mac); + if ((user_specified_mac = mac_aton(optarg)) == NULL) + usage("Cannot parse MAC address.\n"); + if (verbose) + print_hardware_address(user_specified_mac); - break; + break; - case 'i': /* interface name */ + case 'i': /* interface name */ - strncpy(network_interface_name,optarg,sizeof(network_interface_name)-1); - network_interface_name[sizeof(network_interface_name)-1]='\x0'; + strncpy(network_interface_name, optarg, sizeof(network_interface_name) - 1); + network_interface_name[sizeof(network_interface_name) - 1] = '\x0'; - break; + break; - case 'u': /* unicast testing */ - unicast=true; - break; - case 'x': /* exclusive testing aka "rogue DHCP server detection" */ - exclusive=true; - break; + case 'u': /* unicast testing */ + unicast = true; + break; + case 'x': /* exclusive testing aka "rogue DHCP server detection" */ + exclusive = true; + break; - case 'V': /* version */ - print_revision(progname, NP_VERSION); - exit(STATE_UNKNOWN); + case 'V': /* version */ + print_revision(progname, NP_VERSION); + exit(STATE_UNKNOWN); - case 'h': /* help */ - print_help(); - exit(STATE_UNKNOWN); + case 'h': /* help */ + print_help(); + exit(STATE_UNKNOWN); - case 'v': /* verbose */ - verbose=1; - break; - case '?': /* help */ - usage5 (); - break; + case 'v': /* verbose */ + verbose = 1; + break; + case '?': /* help */ + usage5(); + break; - default: - break; + default: + break; } } return optind; } +int validate_arguments(int argc) { -int validate_arguments(int argc){ - - if(argc - optind > 0) + if (argc - optind > 0) usage(_("Got unexpected non-option argument")); 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){ +static int get_msg(int fd) { int flags = 0; int res, ret; ctl_area[0] = 0; @@ -1190,30 +1145,29 @@ static int get_msg(int fd){ ret = 0; res = getmsg(fd, &ctl, &dat, &flags); - if(res < 0){ - if(errno == EINTR){ - return(GOT_INTR); - } - else{ + if (res < 0) { + if (errno == EINTR) { + return (GOT_INTR); + } else { printf("%s\n", "get_msg FAILED."); - return(GOT_ERR); + return (GOT_ERR); } } - if(ctl.len > 0){ + if (ctl.len > 0) { ret |= GOT_CTRL; } - if(dat.len > 0){ + if (dat.len > 0) { ret |= GOT_DATA; } - return(ret); + return (ret); } /* verify that dl_primitive in ctl_area = prim */ -static int check_ctrl(int 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){ + 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); } @@ -1222,35 +1176,35 @@ static int check_ctrl(int prim){ } /* put a control message on a stream */ -static int put_ctrl(int fd, int len, int pri){ +static int put_ctrl(int fd, int len, int pri) { ctl.len = len; - if(putmsg(fd, &ctl, 0, pri) < 0){ + 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; + return 0; } /* put a control + data message on a stream */ -static int put_both(int fd, int clen, int dlen, int pri){ +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){ + 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; + return 0; } /* open file descriptor and attach */ -static int dl_open(const char *dev, int unit, int *fd){ +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){ + 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); } @@ -1262,7 +1216,7 @@ static int dl_open(const char *dev, int unit, int *fd){ } /* send DL_BIND_REQ */ -static int dl_bind(int fd, int sap, u_char *addr){ +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; @@ -1274,12 +1228,11 @@ static int dl_bind(int fd, int sap, u_char *addr){ 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)){ + 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); + bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr, bind_ack->dl_addr_length); return 0; } @@ -1296,13 +1249,13 @@ static int dl_bind(int fd, int sap, u_char *addr){ * ***********************************************************************/ -long mac_addr_dlpi( const char *dev, int unit, u_char *addr){ +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); + if (GOT_ERR != dl_open(dev, unit, &fd)) { + if (GOT_ERR != dl_bind(fd, INSAP, mac_addr)) { + bcopy(mac_addr, addr, 6); return 0; } } @@ -1314,99 +1267,93 @@ long mac_addr_dlpi( const char *dev, int unit, u_char *addr){ /* Kompf 2000-2003 */ #endif - /* resolve host name or die (TODO: move this to netutils.c!) */ -void resolve_host(const char *in,struct in_addr *out){ +void resolve_host(const char *in, struct in_addr *out) { struct addrinfo hints, *ai; - memset(&hints,0,sizeof(hints)); - hints.ai_family=PF_INET; - if (getaddrinfo(in,NULL,&hints,&ai) != 0) - usage_va(_("Invalid hostname/address - %s"),optarg); + memset(&hints, 0, sizeof(hints)); + hints.ai_family = PF_INET; + if (getaddrinfo(in, NULL, &hints, &ai) != 0) + usage_va(_("Invalid hostname/address - %s"), optarg); - memcpy(out,&((struct sockaddr_in *)ai->ai_addr)->sin_addr,sizeof(*out)); + memcpy(out, &((struct sockaddr_in *)ai->ai_addr)->sin_addr, sizeof(*out)); freeaddrinfo(ai); } - /* parse MAC address string, return 6 bytes (unterminated) or NULL */ -unsigned char *mac_aton(const char *string){ +unsigned char *mac_aton(const char *string) { static unsigned char result[6]; char tmp[3]; unsigned i, j; - for(i=0, j=0; string[i] != '\0' && j < sizeof(result); i++){ + for (i = 0, j = 0; string[i] != '\0' && j < sizeof(result); i++) { /* ignore ':' and any other non-hex character */ - if(!isxdigit(string[i]) || !isxdigit(string[i+1])) + if (!isxdigit(string[i]) || !isxdigit(string[i + 1])) continue; - tmp[0]=string[i]; - tmp[1]=string[i+1]; - tmp[2]='\0'; - result[j]=strtol(tmp,(char **)NULL,16); + tmp[0] = string[i]; + tmp[1] = string[i + 1]; + tmp[2] = '\0'; + result[j] = strtol(tmp, (char **)NULL, 16); i++; j++; } - return (j==6) ? result : NULL; + return (j == 6) ? result : NULL; } - -void print_hardware_address(const unsigned char *address){ +void print_hardware_address(const unsigned char *address) { int i; printf(_("Hardware address: ")); - for (i=0; i<5; i++) + for (i = 0; i < 5; i++) printf("%2.2x:", address[i]); printf("%2.2x", address[i]); putchar('\n'); } - /* print usage help */ -void print_help(void){ +void print_help(void) { print_revision(progname, NP_VERSION); printf("Copyright (c) 2001-2004 Ethan Galstad ([email protected])\n"); - printf (COPYRIGHT, copyright, email); + printf(COPYRIGHT, copyright, email); printf("%s\n", _("This plugin tests the availability of DHCP servers on a network.")); - printf ("\n\n"); + printf("\n\n"); print_usage(); - printf (UT_HELP_VRSN); - printf (UT_EXTRA_OPTS); - - printf (UT_VERBOSE); - - printf (" %s\n", "-s, --serverip=IPADDRESS"); - printf (" %s\n", _("IP address of DHCP server that we must hear from")); - printf (" %s\n", "-r, --requestedip=IPADDRESS"); - printf (" %s\n", _("IP address that should be offered by at least one DHCP server")); - printf (" %s\n", "-t, --timeout=INTEGER"); - printf (" %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs")); - printf (" %s\n", "-i, --interface=STRING"); - printf (" %s\n", _("Interface to to use for listening (i.e. eth0)")); - printf (" %s\n", "-m, --mac=STRING"); - printf (" %s\n", _("MAC address to use in the DHCP request")); - printf (" %s\n", "-u, --unicast"); - printf (" %s\n", _("Unicast testing: mimic a DHCP relay, requires -s")); - printf (" %s\n", "-x, --exclusive"); - printf (" %s\n", _("Only requested DHCP server may response (rogue DHCP server detection), requires -s")); - - printf (UT_SUPPORT); + printf(UT_HELP_VRSN); + printf(UT_EXTRA_OPTS); + + printf(UT_VERBOSE); + + printf(" %s\n", "-s, --serverip=IPADDRESS"); + printf(" %s\n", _("IP address of DHCP server that we must hear from")); + printf(" %s\n", "-r, --requestedip=IPADDRESS"); + printf(" %s\n", _("IP address that should be offered by at least one DHCP server")); + printf(" %s\n", "-t, --timeout=INTEGER"); + printf(" %s\n", _("Seconds to wait for DHCPOFFER before timeout occurs")); + printf(" %s\n", "-i, --interface=STRING"); + printf(" %s\n", _("Interface to to use for listening (i.e. eth0)")); + printf(" %s\n", "-m, --mac=STRING"); + printf(" %s\n", _("MAC address to use in the DHCP request")); + printf(" %s\n", "-u, --unicast"); + printf(" %s\n", _("Unicast testing: mimic a DHCP relay, requires -s")); + printf(" %s\n", "-x, --exclusive"); + printf(" %s\n", _("Only requested DHCP server may response (rogue DHCP server detection), requires -s")); + + printf(UT_SUPPORT); return; } +void print_usage(void) { -void -print_usage(void){ - - printf ("%s\n", _("Usage:")); - printf (" %s [-v] [-u] [-x] [-s serverip] [-r requestedip] [-t timeout]\n",progname); - printf (" [-i interface] [-m mac]\n"); + printf("%s\n", _("Usage:")); + printf(" %s [-v] [-u] [-x] [-s serverip] [-r requestedip] [-t timeout]\n", progname); + printf(" [-i interface] [-m mac]\n"); return; }
