From 190bccf58879e59be05ec307fe83061b61a99dfe Mon Sep 17 00:00:00 2001 From: John Crispin Date: Sun, 19 Oct 2025 00:00:00 +0200 Subject: [PATCH] ucentral-tools: format dhcpdiscover.c with clang-format MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Apply clang-format and fix code quality issues found by cppcheck: - Consistent pointer style (char* → char *) - Fix variable shadowing issues - Improve error message formatting - Standardise indentation and brace style Signed-off-by: John Crispin --- .../ucentral-tools/src/dhcpdiscover.c | 1718 +++++++++-------- 1 file changed, 890 insertions(+), 828 deletions(-) diff --git a/feeds/ucentral/ucentral-tools/src/dhcpdiscover.c b/feeds/ucentral/ucentral-tools/src/dhcpdiscover.c index 2e8c0ebfd..225af5d68 100644 --- a/feeds/ucentral/ucentral-tools/src/dhcpdiscover.c +++ b/feeds/ucentral/ucentral-tools/src/dhcpdiscover.c @@ -25,7 +25,7 @@ * *****************************************************************************/ -const char* COPYRIGHT = " \ +const char *COPYRIGHT = " \ *\n \ * License: GPL\n \ * Copyright (c) 2001-2004 Ethan Galstad (nagios@nagios.org)\n \ @@ -57,10 +57,10 @@ const char* COPYRIGHT = " \ * $Id: dhcpdiscover.c,v 2$\n \ *"; -const char* progname = "dhcpdiscover"; -const char* revision = "$Revision: 2$"; -const char* copyright = "2006-2013"; -const char* email = "p4u@dabax.net"; +const char *progname = "dhcpdiscover"; +const char *revision = "$Revision: 2$"; +const char *copyright = "2006-2013"; +const char *email = "p4u@dabax.net"; #include #include @@ -77,56 +77,55 @@ const char* email = "p4u@dabax.net"; #include #include #include -#include #include +#include #if defined(__linux__) -#include -#include + #include + #include #elif defined(__bsd__) -#include -#include -#include + #include + #include + #include #elif defined(__sun__) || defined(__solaris__) || defined(__hpux__) -#define INSAP 22 -#define OUTSAP 24 + #define INSAP 22 + #define OUTSAP 24 -#include -#include -#include -#include -#include + #include + #include + #include + #include + #include -#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 }; +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 -#define u_int8_t uint8_t -#define u_int16_t uint16_t -#define u_int32_t uint32_t + #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*); +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 @@ -155,36 +154,36 @@ long mac_addr_dlpi(const char*, int, u_char*); #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 */ + 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; + 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; + struct in_addr server_address; + struct requested_server_struct *next; } requested_server; #define BOOTREQUEST 1 @@ -234,8 +233,8 @@ u_int32_t dhcp_rebinding_time = 0; 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; @@ -247,925 +246,994 @@ int verbose = 0; int prometheus = 0; struct in_addr requested_address; -static void print_revision(const char* progname, const char* revision) { - fprintf(stderr, "Program: %s %s\n", progname, revision); +static void print_revision(const char *prog_name, const char *prog_revision) +{ + fprintf(stderr, "Program: %s %s\n", prog_name, prog_revision); } -int process_arguments(int, char**); -int call_getopt(int, char**); +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 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 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; + int dhcp_socket; + int result = STATE_UNKNOWN; - setlocale(LC_ALL, ""); - // bindtextdomain (PACKAGE, LOCALEDIR); - // textdomain (PACKAGE); + setlocale(LC_ALL, ""); + // bindtextdomain (PACKAGE, LOCALEDIR); + // textdomain (PACKAGE); - if (process_arguments(argc, argv) != OK) { - printf("Could not parse arguments"); - } + 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) - fprintf(stderr, "Banned addr:%s\n", baddr); - } + // Set banned addr in string format in global var baddr + if (banned) { + inet_ntop(AF_INET, &(banned_ip), baddr, INET_ADDRSTRLEN); + if (verbose) + fprintf(stderr, "Banned addr:%s\n", baddr); + } - /* create socket for DHCP communications */ - dhcp_socket = create_dhcp_socket(); + /* create socket for DHCP communications */ + dhcp_socket = create_dhcp_socket(); - /* get hardware address of client machine */ - get_hardware_address(dhcp_socket, network_interface_name); + /* get hardware address of client machine */ + get_hardware_address(dhcp_socket, network_interface_name); - /* send DHCPDISCOVER packet */ - send_dhcp_discover(dhcp_socket); + /* send DHCPDISCOVER packet */ + send_dhcp_discover(dhcp_socket); - /* wait for a DHCPOFFER packet */ - get_dhcp_offer(dhcp_socket); + /* wait for a DHCPOFFER packet */ + get_dhcp_offer(dhcp_socket); - /* close socket we created */ - close_dhcp_socket(dhcp_socket); + /* close socket we created */ + close_dhcp_socket(dhcp_socket); - /* determine state/plugin output to return */ - if (!prometheus) { - result = get_results(); - } + /* determine state/plugin output to return */ + if (!prometheus) { + result = get_results(); + } - /* free allocated memory */ - free_dhcp_offer_list(); - free_requested_server_list(); + /* free allocated memory */ + free_dhcp_offer_list(); + free_requested_server_list(); - return result; + 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) { - int i; - #if defined(__linux__) - struct ifreq ifr; + struct ifreq ifr; - strncpy((char*)&ifr.ifr_name, interface_name, sizeof(ifr.ifr_name)); + 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) { - fprintf(stderr, "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) { - fprintf(stderr, "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); - } + // 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 j; + for (j = 0; j < MAX_DHCP_CHADDR_LENGTH; ++j) + client_hardware_address[j] = my_client_mac[j]; + memcpy(&ifr.ifr_hwaddr.sa_data, &client_hardware_address[0], 6); + if (ioctl(sock, SIOCSIFHWADDR, &ifr) < 0) { + fprintf(stderr, "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) { + fprintf(stderr, "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); + } + + if (verbose) { + int i; + fprintf(stderr, "Hardware address: "); + for (i = 0; i < 6; ++i) + fprintf(stderr, "%2.2x", client_hardware_address[i]); + fprintf(stderr, "\n"); + } #elif defined(__bsd__) - /* King 2004 see ACKNOWLEDGEMENTS */ + /* King 2004 see ACKNOWLEDGEMENTS */ - int mib[6], len; - char* buf; - unsigned char* ptr; - struct if_msghdr* ifm; - struct sockaddr_dl* sdl; + 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; + 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) { - fprintf(stderr, "if_nametoindex error - %s.\n", strerror(errno); - exit(STATE_UNKNOWN); - } + if ((mib[5] = if_nametoindex(interface_name)) == 0) { + fprintf(stderr, "if_nametoindex error - %s.\n", strerror(errno)); + exit(STATE_UNKNOWN); + } - if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) { - fprintf(stderr, "Couldn't get hardware address from %s. sysctl 1 error - %s.\n", interface_name, strerror(errno); - exit(STATE_UNKNOWN); - } + if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) { + fprintf(stderr, "Couldn't get hardware address from %s. sysctl 1 error - %s.\n", + interface_name, strerror(errno)); + exit(STATE_UNKNOWN); + } - if ((buf = malloc(len)) == NULL) { - fprintf(stderr, "Couldn't get hardware address from interface %s. malloc error - %s.\n", interface_name, strerror(errno); - exit(4); - } + if ((buf = malloc(len)) == NULL) { + fprintf(stderr, + "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) { - fprintf(stderr, "Couldn't get hardware address from %s. sysctl 2 error - %s.\n", interface_name, strerror(errno); - exit(STATE_UNKNOWN); - } + if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) { + fprintf(stderr, "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 */ + 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 */ + + if (verbose) { + int i; + fprintf(stderr, "Hardware address: "); + for (i = 0; i < 6; ++i) + fprintf(stderr, "%2.2x", client_hardware_address[i]); + fprintf(stderr, "\n"); + } #elif defined(__sun__) || defined(__solaris__) - /* Kompf 2000-2003 see ACKNOWLEDGEMENTS */ - long stat; - char dev[20] = "/dev/"; - char* p; - int unit; + /* 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 { - fprintf(stderr, "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) { - fprintf(stderr, "can't read MAC address from DLPI streams interface for " - "device %s unit %d.\n", dev, unit); - exit(STATE_UNKNOWN); - } + for (p = interface_name; *p && isalpha(*p); p++) + /* no-op */; + if (*p != '\0') { + unit = atoi(p); + *p = '\0'; + strncat(dev, interface_name, 6); + } else { + fprintf(stderr, + "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) { + fprintf(stderr, + "can't read MAC address from DLPI streams interface for " + "device %s unit %d.\n", + dev, unit); + exit(STATE_UNKNOWN); + } + + if (verbose) { + int i; + fprintf(stderr, "Hardware address: "); + for (i = 0; i < 6; ++i) + fprintf(stderr, "%2.2x", client_hardware_address[i]); + fprintf(stderr, "\n"); + } #elif defined(__hpux__) - long stat; - char dev[20] = "/dev/dlpi"; - int unit = 0; + long stat; + char dev[20] = "/dev/dlpi"; + int unit = 0; - stat = mac_addr_dlpi(dev, unit, client_hardware_address); - if (stat != 0) { - fprintf(stderr, "can't read MAC address from DLPI streams interface for " - "device %s unit %d.\n", dev, unit); - exit(STATE_UNKNOWN); - } - /* Kompf 2000-2003 */ + stat = mac_addr_dlpi(dev, unit, client_hardware_address); + if (stat != 0) { + fprintf(stderr, + "can't read MAC address from DLPI streams interface for " + "device %s unit %d.\n", + dev, unit); + exit(STATE_UNKNOWN); + } + /* Kompf 2000-2003 */ + + if (verbose) { + int i; + fprintf(stderr, "Hardware address: "); + for (i = 0; i < 6; ++i) + fprintf(stderr, "%2.2x", client_hardware_address[i]); + fprintf(stderr, "\n"); + } #else - fprintf(stderr, "can't get MAC address for this architecture.\n"); - exit(STATE_UNKNOWN); + fprintf(stderr, "can't get MAC address for this architecture.\n"); + exit(STATE_UNKNOWN); #endif - if (verbose) { - fprintf(stderr, "Hardware address: "); - for (i = 0; i < 6; ++i) - fprintf(stderr, "%2.2x", client_hardware_address[i]); - fprintf(stderr, "\n"); - } - - return OK; + 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; + dhcp_packet discover_packet; + struct sockaddr_in sockaddr_broadcast; - /* clear the packet data structure */ - bzero(&discover_packet, sizeof(discover_packet)); + /* clear the packet data structure */ + bzero(&discover_packet, sizeof(discover_packet)); - /* boot request flag (backward compatible with BOOTP servers) */ - discover_packet.op = BOOTREQUEST; + /* boot request flag (backward compatible with BOOTP servers) */ + discover_packet.op = BOOTREQUEST; - /* hardware address type */ - discover_packet.htype = ETHERNET_HARDWARE_ADDRESS; + /* hardware address type */ + discover_packet.htype = ETHERNET_HARDWARE_ADDRESS; - /* length of our hardware address */ - discover_packet.hlen = ETHERNET_HARDWARE_ADDRESS_LENGTH; + /* length of our hardware address */ + discover_packet.hlen = ETHERNET_HARDWARE_ADDRESS_LENGTH; - discover_packet.hops = 0; + discover_packet.hops = 0; - /* transaction id is supposed to be random */ - srand(time(NULL)); - packet_xid = random(); - discover_packet.xid = htonl(packet_xid); + /* 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); + /**** 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; + /*discover_packet.secs=htons(65535);*/ + discover_packet.secs = 0xFF; - /* tell server it should broadcast its response */ - discover_packet.flags = htons(DHCP_BROADCAST_FLAG); + /* 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); + /* 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'; + /* 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; + /* 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)); - } + /* 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)); + /* 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) { - fprintf(stderr, "DHCPDISCOVER to %s port %d\n", - inet_ntoa(sockaddr_broadcast.sin_addr), - ntohs(sockaddr_broadcast.sin_port)); - fprintf(stderr, "DHCPDISCOVER XID: %lu (0x%X)\n", - (unsigned long)ntohl(discover_packet.xid), - ntohl(discover_packet.xid)); - fprintf(stderr, "DHCDISCOVER ciaddr: %s\n", inet_ntoa(discover_packet.ciaddr)); - fprintf(stderr, "DHCDISCOVER yiaddr: %s\n", inet_ntoa(discover_packet.yiaddr)); - fprintf(stderr, "DHCDISCOVER siaddr: %s\n", inet_ntoa(discover_packet.siaddr)); - fprintf(stderr, "DHCDISCOVER giaddr: %s\n", inet_ntoa(discover_packet.giaddr)); - } + if (verbose) { + fprintf(stderr, "DHCPDISCOVER to %s port %d\n", + inet_ntoa(sockaddr_broadcast.sin_addr), ntohs(sockaddr_broadcast.sin_port)); + fprintf(stderr, "DHCPDISCOVER XID: %lu (0x%X)\n", + (unsigned long) ntohl(discover_packet.xid), ntohl(discover_packet.xid)); + fprintf(stderr, "DHCDISCOVER ciaddr: %s\n", inet_ntoa(discover_packet.ciaddr)); + fprintf(stderr, "DHCDISCOVER yiaddr: %s\n", inet_ntoa(discover_packet.yiaddr)); + fprintf(stderr, "DHCDISCOVER siaddr: %s\n", inet_ntoa(discover_packet.siaddr)); + fprintf(stderr, "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 the DHCPDISCOVER packet out */ + send_dhcp_packet(&discover_packet, sizeof(discover_packet), sock, &sockaddr_broadcast); - if (verbose) - fprintf(stderr, "\n\n"); + if (verbose) + fprintf(stderr, "\n\n"); - return OK; + 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 responses = 0; - int x; - time_t start_time; - time_t current_time; + dhcp_packet offer_packet; + struct sockaddr_in source; + int responses = 0; + int x; + time_t start_time; + time_t current_time; - time(&start_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; + /* 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) - fprintf(stderr, "\n\n"); + if (verbose) + fprintf(stderr, "\n\n"); - bzero(&source, sizeof(source)); - bzero(&offer_packet, sizeof(offer_packet)); + 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); + int 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); + // 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) { - fprintf(stderr, "DHCP offer comming from the banned addr %s, ignoring it\n", - baddr); - result = 1; - } + if (banned && strcmp(saddr, baddr) == 0) { + fprintf(stderr, "DHCP offer comming from the banned addr %s, ignoring it\n", + baddr); + result = 1; + } - if (result != OK) { - if (verbose) - fprintf(stderr, "Result=ERROR\n"); - continue; - } else { - if (verbose) - fprintf(stderr, "Result=OK\n"); - responses++; - } + if (result != OK) { + if (verbose) + fprintf(stderr, "Result=ERROR\n"); + continue; + } else { + if (verbose) + fprintf(stderr, "Result=OK\n"); + responses++; + } - if (verbose) { - fprintf(stderr, "DHCPOFFER from IP address %s\n", inet_ntoa(source.sin_addr)); - fprintf(stderr, "DHCPOFFER XID: %lu (0x%X)\n", - (unsigned long)ntohl(offer_packet.xid), ntohl(offer_packet.xid)); - } + if (verbose) { + fprintf(stderr, "DHCPOFFER from IP address %s\n", + inet_ntoa(source.sin_addr)); + fprintf(stderr, "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) - fprintf(stderr, "DHCPOFFER XID (%lu) did not match DHCPDISCOVER XID (%lu) - " - "ignoring packet\n", - (unsigned long)ntohl(offer_packet.xid), - (unsigned long)packet_xid); - continue; - } + /* 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) + fprintf( + stderr, + "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) - fprintf(stderr, "DHCPOFFER chaddr: "); + /* check hardware address */ + result = OK; + if (verbose) + fprintf(stderr, "DHCPOFFER chaddr: "); - for (x = 0; x < ETHERNET_HARDWARE_ADDRESS_LENGTH; x++) { - if (verbose) - fprintf(stderr, "%02X", (unsigned char)offer_packet.chaddr[x]); + for (x = 0; x < ETHERNET_HARDWARE_ADDRESS_LENGTH; x++) { + if (verbose) + fprintf(stderr, "%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) - fprintf(stderr, "\n"); + if (verbose) + fprintf(stderr, "\n"); - if (result == ERROR) { - if (verbose) - fprintf(stderr, "DHCPOFFER hardware address did not match our own - ignoring " - "packet\n"); - continue; - } + if (result == ERROR) { + if (verbose) + fprintf( + stderr, + "DHCPOFFER hardware address did not match our own - ignoring " + "packet\n"); + continue; + } - if (verbose) { - fprintf(stderr, "DHCPOFFER ciaddr: %s\n", inet_ntoa(offer_packet.ciaddr)); - fprintf(stderr, "DHCPOFFER yiaddr: %s\n", inet_ntoa(offer_packet.yiaddr)); - fprintf(stderr, "DHCPOFFER siaddr: %s\n", inet_ntoa(offer_packet.siaddr)); - fprintf(stderr, "DHCPOFFER giaddr: %s\n", inet_ntoa(offer_packet.giaddr)); - } + if (verbose) { + fprintf(stderr, "DHCPOFFER ciaddr: %s\n", inet_ntoa(offer_packet.ciaddr)); + fprintf(stderr, "DHCPOFFER yiaddr: %s\n", inet_ntoa(offer_packet.yiaddr)); + fprintf(stderr, "DHCPOFFER siaddr: %s\n", inet_ntoa(offer_packet.siaddr)); + fprintf(stderr, "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++; - } + valid_responses++; + } - if (verbose) { - fprintf(stderr, "Total responses seen on the wire: %d\n", responses); - fprintf(stderr, "Valid responses for this machine: %d\n", valid_responses); - } + if (verbose) { + fprintf(stderr, "Total responses seen on the wire: %d\n", responses); + fprintf(stderr, "Valid responses for this machine: %d\n", valid_responses); + } - return OK; + 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; + 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) - fprintf(stderr, "send_dhcp_packet result: %d\n", result); + if (verbose) + fprintf(stderr, "send_dhcp_packet result: %d\n", result); - if (result < 0) - return ERROR; + if (result < 0) + return ERROR; - return OK; + 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; - int recv_result; - socklen_t address_size; - struct sockaddr_in source_address; + struct timeval tv; + fd_set readfds; + 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); + /* 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) - fprintf(stderr, "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); + /* make sure some data has arrived */ + if (!FD_ISSET(sock, &readfds)) { + if (verbose) + fprintf(stderr, "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); + int recv_result = recvfrom(sock, (char *) buffer, buffer_size, MSG_PEEK, + (struct sockaddr *) &source_address, &address_size); - if (verbose) - fprintf(stderr, "recv_result_1: %d\n", recv_result); + if (verbose) + fprintf(stderr, "recv_result_1: %d\n", recv_result); - recv_result = recvfrom(sock, (char *)buffer, buffer_size, 0, - (struct sockaddr *)&source_address, &address_size); - if (verbose) - fprintf(stderr, "recv_result_2: %d\n", recv_result); + recv_result = recvfrom(sock, (char *) buffer, buffer_size, 0, + (struct sockaddr *) &source_address, &address_size); + if (verbose) + fprintf(stderr, "recv_result_2: %d\n", recv_result); - if (recv_result == -1) { - if (verbose) { - fprintf(stderr, "recvfrom() failed, "); - fprintf(stderr, "errno: (%d) -> %s\n", errno, strerror(errno)); - } - return ERROR; - } else { - if (verbose) { - fprintf(stderr, "receive_dhcp_packet() result: %d\n", recv_result); - fprintf(stderr, "receive_dhcp_packet() source: %s\n", - inet_ntoa(source_address.sin_addr)); - } + if (recv_result == -1) { + if (verbose) { + fprintf(stderr, "recvfrom() failed, "); + fprintf(stderr, "errno: (%d) -> %s\n", errno, strerror(errno)); + } + return ERROR; + } else { + if (verbose) { + fprintf(stderr, "receive_dhcp_packet() result: %d\n", recv_result); + fprintf(stderr, "receive_dhcp_packet() source: %s\n", + inet_ntoa(source_address.sin_addr)); + } - memcpy(address, &source_address, sizeof(source_address)); - return OK; - } - } + memcpy(address, &source_address, sizeof(source_address)); + return OK; + } + } - 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; + 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)); + /* 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) { - fprintf(stderr, "Could not create socket!\n"); - exit(STATE_UNKNOWN); - } + /* create a socket for DHCP communications */ + sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); + if (sock < 0) { + fprintf(stderr, "Could not create socket!\n"); + exit(STATE_UNKNOWN); + } - if (verbose) - fprintf(stderr, "DHCP socket: %d\n", sock); + if (verbose) + fprintf(stderr, "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) { - fprintf(stderr, "Could not set reuse address option on DHCP socket!\n"); - exit(STATE_UNKNOWN); - } + /* 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) { + fprintf(stderr, "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) { - fprintf(stderr, "Could not set broadcast 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) { + fprintf(stderr, "Could not set broadcast option on DHCP socket!\n"); + exit(STATE_UNKNOWN); + } - /* bind socket to interface */ + /* 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) { - fprintf(stderr, "Could not bind socket to interface %s. Check your " - "privileges...\n", - network_interface_name); - perror("foo"); - exit(STATE_UNKNOWN); - } + strncpy(interface.ifr_ifrn.ifrn_name, network_interface_name, IFNAMSIZ); + if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, (char *) &interface, sizeof(interface)) < + 0) { + fprintf(stderr, + "Could not bind socket to interface %s. Check your " + "privileges...\n", + network_interface_name); + perror("foo"); + exit(STATE_UNKNOWN); + } #else - strncpy(interface.ifr_name, network_interface_name, IFNAMSIZ); + strncpy(interface.ifr_name, network_interface_name, IFNAMSIZ); #endif - /* bind the socket */ - if (bind(sock, (struct sockaddr *)&myname, sizeof(myname)) < 0) { - fprintf(stderr, "Could not bind to DHCP socket (port %d)! Check your " - "privileges...\n", DHCP_CLIENT_PORT); - exit(STATE_UNKNOWN); - } + /* bind the socket */ + if (bind(sock, (struct sockaddr *) &myname, sizeof(myname)) < 0) { + fprintf(stderr, + "Could not bind to DHCP socket (port %d)! Check your " + "privileges...\n", + DHCP_CLIENT_PORT); + exit(STATE_UNKNOWN); + } - return sock; + return sock; } /* closes DHCP socket */ int close_dhcp_socket(int sock) { - close(sock); - return OK; + close(sock); + return OK; } /* adds a requested server address to list in memory */ static int add_requested_server(struct in_addr server_address) { - requested_server* new_server; + requested_server *new_server; - new_server = (requested_server*)malloc(sizeof(requested_server)); - if (new_server == NULL) - return ERROR; + new_server = (requested_server *) malloc(sizeof(requested_server)); + if (new_server == NULL) + return ERROR; - new_server->server_address = server_address; + new_server->server_address = server_address; - new_server->next = requested_server_list; - requested_server_list = new_server; + new_server->next = requested_server_list; + requested_server_list = new_server; - requested_servers++; + requested_servers++; - if (verbose) - fprintf(stderr, "Requested server address: %s\n", - inet_ntoa(new_server->server_address)); + if (verbose) + fprintf(stderr, "Requested server address: %s\n", + inet_ntoa(new_server->server_address)); - return OK; + 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; - int y; - unsigned option_type; - unsigned option_length; + dhcp_offer *new_offer; + int x; + unsigned int y; - if (offer_packet == NULL) - return ERROR; + if (offer_packet == NULL) + return ERROR; - /* process all DHCP options present in the packet */ - for (x = 4; x < MAX_DHCP_OPTIONS_LENGTH;) { + /* 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 (offer_packet->options[x] == 255 || offer_packet->options[x] == 0) + break; - /* 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 */ + unsigned option_type = offer_packet->options[x++]; - /* get option type */ - option_type = offer_packet->options[x++]; + /* get option length */ + unsigned option_length = offer_packet->options[x++]; - /* get option length */ - option_length = offer_packet->options[x++]; + if (verbose) + fprintf(stderr, "Option: %u (0x%02X)\n", option_type, option_length); - if (verbose) - fprintf(stderr, "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); + } - /* 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++) + ; + } - /* skip option data we're ignoring */ - else - for (y = 0; y < option_length; y++, x++); - } + if (verbose) { + if (dhcp_lease_time == DHCP_INFINITE_TIME) + fprintf(stderr, "Lease Time: Infinite\n"); + else + fprintf(stderr, "Lease Time: %lu seconds\n", + (unsigned long) dhcp_lease_time); + if (dhcp_renewal_time == DHCP_INFINITE_TIME) + fprintf(stderr, "Renewal Time: Infinite\n"); + else + fprintf(stderr, "Renewal Time: %lu seconds\n", + (unsigned long) dhcp_renewal_time); + if (dhcp_rebinding_time == DHCP_INFINITE_TIME) + fprintf(stderr, "Rebinding Time: Infinite\n"); + fprintf(stderr, "Rebinding Time: %lu seconds\n", + (unsigned long) dhcp_rebinding_time); + } - if (verbose) { - if (dhcp_lease_time == DHCP_INFINITE_TIME) - fprintf(stderr, "Lease Time: Infinite\n"); - else - fprintf(stderr, "Lease Time: %lu seconds\n", (unsigned long)dhcp_lease_time); - if (dhcp_renewal_time == DHCP_INFINITE_TIME) - fprintf(stderr, "Renewal Time: Infinite\n"); - else - fprintf(stderr, "Renewal Time: %lu seconds\n", (unsigned long)dhcp_renewal_time); - if (dhcp_rebinding_time == DHCP_INFINITE_TIME) - fprintf(stderr, "Rebinding Time: Infinite\n"); - fprintf(stderr, "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) + return ERROR; - 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; - 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) { + fprintf(stderr, "Added offer from server @ %s", + inet_ntoa(new_offer->server_address)); + fprintf(stderr, " of IP address %s\n", inet_ntoa(new_offer->offered_address)); + } - if (verbose) { - fprintf(stderr, "Added offer from server @ %s", - inet_ntoa(new_offer->server_address)); - fprintf(stderr, " of IP address %s\n", inet_ntoa(new_offer->offered_address)); - } + if (prometheus) { + fprintf(stderr, "dhcpdiscover_offer{ "); + fprintf(stderr, "server=\"%s\",", inet_ntoa(new_offer->server_address)); + fprintf(stderr, "address=\"%s\",", inet_ntoa(new_offer->offered_address)); + fprintf(stderr, "dev=\"%s\" } 1\n", network_interface_name); + } - if (prometheus) { - fprintf(stderr, "dhcpdiscover_offer{ "); - fprintf(stderr, "server=\"%s\",", inet_ntoa(new_offer->server_address)); - fprintf(stderr, "address=\"%s\",", inet_ntoa(new_offer->offered_address)); - fprintf(stderr, "dev=\"%s\" } 1\n", network_interface_name); - } + /* add new offer to head of list */ + new_offer->next = dhcp_offer_list; + dhcp_offer_list = new_offer; - /* add new offer to head of list */ - new_offer->next = dhcp_offer_list; - dhcp_offer_list = new_offer; - - return OK; + return OK; } /* frees memory allocated to DHCP OFFER list */ int free_dhcp_offer_list(void) { - dhcp_offer* this_offer; - dhcp_offer* next_offer; + 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); - } + for (this_offer = dhcp_offer_list; this_offer != NULL; this_offer = next_offer) { + next_offer = this_offer->next; + free(this_offer); + } - return OK; + return OK; } /* frees memory allocated to requested server list */ int free_requested_server_list(void) { - requested_server* this_server; - requested_server* next_server; + 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); - } + for (this_server = requested_server_list; this_server != NULL; this_server = next_server) { + next_server = this_server->next; + free(this_server); + } - return OK; + 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; + dhcp_offer *temp_offer; + requested_server *temp_server; + int result; + u_int32_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) { + /* 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; - for (temp_server = requested_server_list; temp_server != NULL; temp_server = temp_server->next) { + /* see if we got the address we requested */ + if (!memcmp(&requested_address, &temp_offer->offered_address, + sizeof(requested_address))) + received_requested_address = TRUE; - for (temp_offer = dhcp_offer_list; temp_offer != NULL; temp_offer = temp_offer->next) { + /* 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) { + fprintf(stderr, "DHCP Server Match: Offerer=%s", + inet_ntoa(temp_offer->server_address)); + fprintf(stderr, " Requested=%s\n", + inet_ntoa(temp_server->server_address)); + } + requested_responses++; + } + } + } + } - /* 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; + /* 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; + /* 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) { - fprintf(stderr, "DHCP Server Match: Offerer=%s", - inet_ntoa(temp_offer->server_address)); - fprintf(stderr, " Requested=%s\n", inet_ntoa(temp_server->server_address)); - } - requested_responses++; - } - } - } - } + 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; - /* 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) { + fprintf(stderr, "DHCP %s: ", (result == STATE_OK) ? "ok" : "problem"); - /* 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; + /* we didn't receive any DHCPOFFERs */ + if (dhcp_offer_list == NULL) { + fprintf(stderr, "No DHCPOFFERs were received.\n"); + return result; + } - /* see if we got the address we requested */ - if (!memcmp(&requested_address, &temp_offer->offered_address, sizeof(requested_address))) - received_requested_address = TRUE; - } - } + fprintf(stderr, "Received %d DHCPOFFER(s)", valid_responses); - 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; + if (requested_servers > 0) + fprintf(stderr, ", %s%d of %d requested servers responded", + ((requested_responses < requested_servers) && requested_responses > 0) + ? "only " + : "", + requested_responses, requested_servers); - fprintf(stderr, "DHCP %s: ", (result == STATE_OK) ? "ok" : "problem"); + if (request_specific_address == TRUE) + fprintf(stderr, ", requested address (%s) was %soffered", + inet_ntoa(requested_address), + (received_requested_address == TRUE) ? "" : "not "); - /* we didn't receive any DHCPOFFERs */ - if (dhcp_offer_list == NULL) { - fprintf(stderr, "No DHCPOFFERs were received.\n"); - return result; - } + fprintf(stderr, ", max lease time = "); + if (max_lease_time == DHCP_INFINITE_TIME) + fprintf(stderr, "Infinity"); + else + fprintf(stderr, "%lu sec", (unsigned long) max_lease_time); - fprintf(stderr, "Received %d DHCPOFFER(s)", valid_responses); + fprintf(stderr, ".\n"); - if (requested_servers > 0) - fprintf(stderr, ", %s%d of %d requested servers responded", - ((requested_responses < requested_servers) && requested_responses > 0) - ? "only " : "", - requested_responses, requested_servers); - - if (request_specific_address == TRUE) - fprintf(stderr, ", requested address (%s) was %soffered", - inet_ntoa(requested_address), - (received_requested_address == TRUE) ? "" : "not "); - - fprintf(stderr, ", max lease time = "); - if (max_lease_time == DHCP_INFINITE_TIME) - fprintf(stderr, "Infinity"); - else - fprintf(stderr, "%lu sec", (unsigned long)max_lease_time); - - fprintf(stderr, ".\n"); - - return result; + return result; } /* process command-line arguments */ -int process_arguments(int argc, char** argv) +int process_arguments(int argc, char **argv) { - int c; + int c; - if (argc < 1) - return ERROR; + if (argc < 1) + return ERROR; - c = 0; - while ((c += (call_getopt(argc - c, &argv[c]))) < argc) { - /* - if(is_option(argv[c])) - continue; - */ - } + c = 0; + while ((c += (call_getopt(argc - c, &argv[c]))) < argc) { + /* + if(is_option(argv[c])) + continue; + */ + } - return validate_arguments(); + return validate_arguments(); } -int call_getopt(int argc, char** argv) +int call_getopt(int argc, char **argv) { - int c = 0; - int i = 0; - struct in_addr ipaddress; + int c; + 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 } }; + 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) { + while (1) { #ifdef HAVE_GETOPT_H - c = getopt_long(argc, argv, "+hVvpt:s:r:t:i:m:b:", long_options, &option_index); + 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:"); + c = getopt(argc, argv, "+?hVvpt:s:r:t:i:m:b:"); #endif - i++; + i++; - if (c == -1 || c == EOF || c == 1) - break; + if (c == EOF || c == 1) + break; - switch (c) { - case 'w': - case 'r': - case 't': - case 'i': - i++; - break; - default: - break; - } + switch (c) { + case 'w': + case 'r': + case 't': + case 'i': + i++; + break; + default: + break; + } - switch (c) { + 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 + fprintf(stderr, "Banned IP not specified, ignoring -b"); + break; - 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 - fprintf(stderr, "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 '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 '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 '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 '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 'V': /* version */ - print_revision(progname, revision); - exit(STATE_OK); + case 'h': /* help */ + print_help(); + exit(STATE_OK); - case 'h': /* help */ - print_help(); - exit(STATE_OK); + case 'v': /* verbose */ + verbose = 1; + break; - case 'v': /* verbose */ - verbose = 1; - break; + case 'p': /* prometheus */ + prometheus = 1; + break; - case 'p': /* prometheus */ - prometheus = 1; - break; + default: /* help */ + fprintf(stderr, "Unknown argument: %s", optarg); + break; + } + } - default: /* help */ - fprintf(stderr, "Unknown argument: %s", optarg); - break; - } - } - - return i; + return i; } -int validate_arguments(void) { return OK; } +int validate_arguments(void) +{ + return OK; +} #if defined(__sun__) || defined(__solaris__) || defined(__hpux__) @@ -1174,98 +1242,92 @@ int validate_arguments(void) { return OK; } /* 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); + 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 { - fprintf(stderr, "%s\n", "get_msg FAILED."); - return (GOT_ERR); - } - } - if (ctl.len > 0) { - ret |= GOT_CTRL; - } - if (dat.len > 0) { - ret |= GOT_DATA; - } - return (ret); + if (res < 0) { + if (errno == EINTR) { + return (GOT_INTR); + } else { + fprintf(stderr, "%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) { - fprintf(stderr, "DLPI stream API failed to get MAC in check_ctrl: %s.\n", strerror(errno); - exit(STATE_UNKNOWN); - } - return 0; + dl_error_ack_t *err_ack = (dl_error_ack_t *) ctl_area; + if (err_ack->dl_primitive != prim) { + fprintf(stderr, "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) { - fprintf(stderr, "DLPI stream API failed to get MAC in put_ctrl/putmsg(): %s.\n", strerror(errno); - exit(STATE_UNKNOWN); - } - return 0; + ctl.len = len; + if (putmsg(fd, &ctl, 0, pri) < 0) { + fprintf(stderr, "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) { - fprintf(stderr, "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) +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) { - fprintf(stderr, "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); + dl_attach_req_t *attach_req = (dl_attach_req_t *) ctl_area; + if ((*fd = open(dev, O_RDWR)) == -1) { + fprintf(stderr, + "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) +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)) { - fprintf(stderr, "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; + 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)) { + fprintf(stderr, "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; } /*********************************************************************** @@ -1280,19 +1342,19 @@ 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]; + 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; + 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 */ @@ -1302,17 +1364,16 @@ long mac_addr_dlpi(const char* dev, int unit, u_char* addr) /* print usage help */ void print_help(void) { + print_revision(progname, revision); - print_revision(progname, revision); + fprintf(stderr, "%s", COPYRIGHT); - fprintf(stderr, COPYRIGHT, copyright, email); + fprintf(stderr, "\n\nThis program checks the existence and more details of a DHCP " + "server\n\n"); - fprintf(stderr, "\n\nThis program checks the existence and more details of a DHCP " - "server\n\n"); + print_usage(); - print_usage(); - - fprintf(stderr, "\ + fprintf(stderr, "\ -s, --serverip=IPADDRESS\n\ IP address of DHCP server that we must hear from\n\ -r, --requestedip=IPADDRESS\n\ @@ -1339,7 +1400,8 @@ Example: sudo ./dhcpdiscover -i eth0 -b 192.168.1.1\n\ void print_usage(void) { - fprintf(stderr, "\ + fprintf(stderr, "\ Usage: %s [-s serverip] [-r requestedip] [-m clientmac ] [-b bannedip] [-t timeout] [-i interface]\n\ - [-v] [-p]", progname); + [-v] [-p]", + progname); }